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A L T R A I N D U S T R I A L M O T I O N Industrial Disc Brakes
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Industrial Disc Brakes - BIBUS

Oct 03, 2021

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Page 1: Industrial Disc Brakes - BIBUS

A L T R A I N D U S T R I A L M O T I O N

Industrial Disc Brakes

Page 2: Industrial Disc Brakes - BIBUS

Twiflex Limited, with headquarters in

Twickenham, England, specialises in the

design, manufacture and supply of

Advanced Braking Technology for industrial

applications. With extensive in-house

facilities, Twiflex enjoys a global reputation

for quality.

Founded in 1946, Twiflex has produced

more than half a million brake units,

frequently for safety-critical duty, for

applications around the world. From

textile machines in the north of England to

the world's deepest mine shaft in South

Africa, Twiflex brakes are specified by

engineers and system designers in every

type of industry.

From defining complete braking systems to

identifying spare components, the catalogue

provides useful guidance. An approximate

brake selection may be made by assessing

the data shown, however, it is always

recommended to contact a Twiflex

representative for a more detailed proposal.

Brake Calipers

MU SeriesPage 6 - 7

Hydraulic Power UnitsPage 40

Monitoring UnitsPage 39

Materials, Traceability & FinishesPage 39

MS SeriesPage 8 - 10

MR SeriesPage 11 - 14

MX SeriesPage 15 - 21

GMX SeriesPage 22 - 26

GMR SeriesPage 27 - 29

Modular SeriesPage 30 - 37

Disc and Hub AssembliesPage 38

ApplicationsPage 2 - 3

OverviewPage 4 - 5

Application FormPage 45

Braking CalculationsPage 41 - 44

Twiflex Limited...Leaders In AdvancedBraking Technology

Introduction/Selection Guide

Page 3: Industrial Disc Brakes - BIBUS

Select the right Twiflex Brake to meet your requirements

Spring Applied Calipers†

Direct Acting Calipers†

The charts below illustrate the range of standard TWIFLEX disc brakes. Model-specific publications and data sheets are available for each caliper shown. To determine which will suit your application compare the braking force required with that generated by the calipers*, noting that other factors (e.g. disc speed, pad material, service factor, etc) should be considered for optimal selection.Twiflex application engineers can provide assistance for your particular application.

*It should be noted that the braking forces shown are for a single caliper only and multiple calipers may often be used on a disc, withavailable space being the typical limitation.

0.4 1 10 100 1000BRAKING FORCE kN

0.4 1 10 100 1000BRAKING FORCE kN

MUS - (P)

MS - (P, H)

MR - (P, H, E)

MX- (P, H, E)

GMR - (P, H)

VCS - (H)

VKSD - (H)

VS - (H)

VMS - (H)

VMH - (H)

VH - (H)

VKHD - (H)

VCH - (H)

T40 - (H)

GMR - (P, H)

VC - (H)

T20 - (P, H)

MR - (P, M)

MX - (P, M)

MS - (P, M)

MU - (P, M)

T2 - (P, H)

† KEY: (P) = Pneumatic, (H) = Hydraulic, (E) = Electrical, (M) = Mechanical

Page 4: Industrial Disc Brakes - BIBUS

Twiflex brakes are used on criticalapplications throughout the metalsprocessing industry for reliabledynamic, holding and emergency-stop duties. Typical applications include:

• Rolling and slitting• Finishing and coating• Cranes and haulage• Shears and forging

Metals

Twiflex disc brakes are found on industrial applications worldwide.

For more than 40 years, Twiflex has been specified toprovide safety-critical brakingcontrol in the miningindustry. Typical applicationsinclude:

• Winders and hoists• Conveyors• Grinding mills• Drag lines and shovels• Reclaimers and haulage

Mining

Disc brake systems are typically used on industrial(freight) elevators and mass transit escalators. They

provide safe, controlled braking in the event of powerloss or emergency stop situations.

Lifts and Escalators

2

Page 5: Industrial Disc Brakes - BIBUS

Twiflex calipers are used to provide speed control, static holding,and emergency braking on a variety of applications, including:

• Theme park rides• Simulators• Stage gear, props and scenery• Monorails

Entertainment

Twiflex provides specialist solutions for the marine industry ranging frommain propulsion shaft and thrusters braking to winch drive and weaponsystems brakes.

Marine and Shipping

Disc brake systems are used on and off-shore in the wind, wave, tidal, and oil and gas industries. Typical applications include:

• Wind and tidal turbine over-speed control

• Draw-works stopping and holding

• Wind turbine yaw motion control

Energy

3

Page 6: Industrial Disc Brakes - BIBUS

4 Twiflex +44 (0) 20 8894 1161 P-1648-TF 11/10

Brake System Overview

Brake CalipersTwiflex offers the largest range of industrial disc brake calipersin the world. Spring applied units may be retractedpneumatically, hydraulically or electrically (depending oncaliper design) while most direct acting brakes have someform of positive retraction device.

In general, pneumatically applied brakes are best suited forlight to medium stopping duties and for tensioningapplications where a high degree of control is required.Hydraulically applied brakes address higher torquerequirements, while spring applied calipers are essential wherebraking must be maintained in the event of supply systemfailure.

Mechanically applied units are suitable for light tensioningduties or where no external power is available - they may alsobe specified when designers wish to use their own means ofactuation.

DiscsTwiflex produces a large range of standard discs andassociated mounting hubs. These can be supplied pilot boredor fully machined to suit the particular mounting or shaftarrangement.

Special discs for specific applications may also be suppliedon request – contact Twiflex to discuss your requirements.

CouplingsTwiflex manufactures a range of torsionally flexible, rubber-element couplings for a range of duties. Sometimes combinedwith a brake disc, they are a critical interface betweencomponents of a transmission system. Twiflex engineers areavailable to discuss, analyse and advise on coupling suitabilityfor any application, and provide the technical support needed.

Brake PadsIt is possible to make a realistic assessment of expected padlife based on analytical and test data. Pad life is determinedby the area of the brake pad, the energy dissipated duringbraking and the peak braking path temperature, and must bea consideration whenever the duty includes dynamic braking.

Page 7: Industrial Disc Brakes - BIBUS

5P-1648-TF 11/10 Twiflex +44 (0) 20 8894 1161

Brake System Overview

Hydraulic Power UnitsA number of electro-hydraulic power pack options areavailable, from standard ‘on/off’ control units to fullycustomised closed-loop braking systems. All require carefulselection in order to ensure full compatibility with the type andnumber of brakes being controlled. Consultation with Twiflexengineers is recommended.• The LC range provides a basic on/off control for a range of

Twiflex spring-applied and direct acting hydraulic calipers• The MP range of modular power units offers flexibility of

design and function• Custom units are available on request

Monitoring EquipmentEvery brake installation requires monitoring visually,mechanically, or electrically; particularly spring applied brakeson safety-critical applications. Twiflex can supply a range ofelectro-mechanical and electronic monitoring units and limitswitches to indicate any combination of brake status or padcondition.

Materials, Finishes and TraceabilityTwiflex is approved to BS EN ISO 9001:2000 and can offermaterial and dimensional certification by Lloyds Register andother regulatory authorities. All units are supplied with astandard Twiflex finish while special protective coatings to suitparticular environments are available on request.

Page 8: Industrial Disc Brakes - BIBUS

6 Twiflex +44 (0) 20 8894 1161 P-1648-TF 11/10

MU Series

MU Disc Brake Caliper Range

The Twiflex MU series of disc brake calipers is the smallest inthe Twiflex range and is primarily intended for light stoppingand holding duties. Its design permits left or right-handedassembly.

The caliper is suitable for use with a disc thickness of 8mm,however, with a revised thruster mounting arrangement, maybe used with discs 12.7mm thick. Minimum disc diameter is150mm. A range of brake discs is available from Twiflex (seeDisc and Hub Assemblies).

Fixing bolt to be supplied by the customer

For pneumatic operation use dry, filtered and non-lubricatedcompressed air. Pneumatic brakes require a control valve,operated either manually or by pneumatic or electrical signal.

The ratings shown on the graphs are based on fully bedded inand conditioned brake pads with a nominal friction coefficientμ = 0.4. Twiflex disc brakes must be used with Twiflexasbestos free brake pads.

Effective disc radius = actual radius (m) – 0.02m.

Maximum Pressure 5 barMaximum Braking Force = 2.75kN@ 5 barWeight of caliper and thruster - 1.9kgWeight of thruster only – 1.15kgVolume displacement of thruster at 13mm stroke = 46ml

TYPETYPE

MUMU3"3"

WIFLEXWIFLEXTT

175 (6.9)

89(3.5)

66(2.6)

ø 118 (ø4.6)

206(8.1)

TYPEMU

3"WIFLEXT

160(6.3)

89(3.5)

66(2.6)

TYPEMU

3"WIFLEXT

150 200 250 300 350 400 460 515

Air

Pres

sure

– b

ar

5

4

3

2

1

00 100 200 300 400 500 600 700

Braking Torque Nm

Disc Diameter mmTYPE

MU

3"WIFLEXT

150 200 250 300 350 400 460 515

Air

Pres

sure

– b

ar

7

6

5

4

3

2

1

00 20 40 60 80 100 120 140 160 180

Braking Torque Nm

Disc Diameter mm

MUP Pneumatically Applied – Spring Released

MU3 Pneumatically Applied – Spring Released

Maximum Pressure 7 barMaximum Braking Force = 0.72kN@ 7 barWeight of caliper and thruster - 0.8kgWeight of thruster only – 0.05kgVolume displacement of thruster at 6mm stroke = 4ml

TYPEMU

3"WIFLEXT

M10 mounting bolt tighten to 46Nm (34 lb.ft.)

18(0.7)

160(6.3)

89 (3.5)66 (2.6)

Retraction pressures where shown are calculated and may vary depending on spring tolerance.

Page 9: Industrial Disc Brakes - BIBUS

7P-1648-TF 11/10 Twiflex +44 (0) 20 8894 1161

MUS2 Spring Applied – Pneumatically Released150 200 250 300 350 400 460 515

0

1

32

3

Disc Diameter mm

Air

Pres

sure

– b

ar

0 25 50 75 100 125 150

Braking Torque Nm

150 200 250 300 350 400 460 515Disc Diameter mm

Air

Pres

sure

– b

ar

0 25 50 75 100 125 150 175 200

0

0.5

1

1.5

Braking Torque Nm

150 200 250 300 350 400 460 5150

1

2

3

4

5

Disc Diameter mm

Air

Pres

sure

– b

ar

0 100 200 300 400 500 600 700

Braking Torque Nm

150 200 250 300 350 400 460 515Disc Diameter mm

Braking Torque Nm

Forc

e –

N

0 10 20 30 40 50 60 70 80 90 100 110 120 130

350

300

250

200

150

100

50

0

Maximum Pressure = 7 barMinimum Pressure for full retraction = 4.3 barMaximum Braking Force = 0.6kN

Weight of caliper and thruster – 1.36kgWeight of thruster only – 0.61kgVolume displacement of thruster at fullretraction = 20ml

TYPETYPE

MUMUXE

LFIW

XELFI

WTT

89(3.5)

66(2.6)

188 (7.4)

172(6.8)

TYPETYPE

MUMU

89(3.5)

66(2.6)

189 (7.4) ø 118 (ø4.6)

200(7.9)

TYPETYPE

MUMU

89(3.5)

66(2.6)

220 (8.7)

200(7.9)

ø 118 (ø4.6)

TYPETYPE

MU

MU

XEL FI

WXE

L FIW

TT

WIFLEXWIFLEXTT

89(3.5)

66(2.6)

148 (5.8)

Maximum Pressure = 7 barMinimum Pressure for full retraction = 1.75 barMaximum Braking Force = 0.76kN

Weight of caliper and thruster – 2.2kgWeight of thruster only – 1.45kgVolume displacement of thruster at fullretraction = 46ml

Maximum Pressure = 7 barMinimum Pressure for full retraction = 6.2barMaximum Braking Force = 2.6kN

Weight of caliper and thruster – 2.24kgWeight of thruster only – 1.49kgVolume displacement of thruster at fullretraction = 46ml

MUH Mechanically Applied – Hand Operated

Weight of caliper and thruster – 1.9kgWeight of hand wheel assembly only – 1.15kg

Maximum Braking Force = 0.51kN

MU Series

MUS3 Spring Applied – Pneumatically Released

MUS4 Spring Applied – Pneumatically Released

Retraction pressures where shown are calculated and may vary depending on spring tolerance.

Page 10: Industrial Disc Brakes - BIBUS

8 Twiflex +44 (0) 20 8894 1161 P-1648-TF 11/10

MS Disc Brake Caliper Range

The Twiflex MS series of disc brake calipers is suitable for usewith a disc thickness of 12.7mm. Minimum disc diameter is250mm.

Normally one or two calipers are used per disc, mountedhorizontally (i.e. at the 3 o’clock or 9 o’clock position) toprevent rubbing of one brake pad due to self-weight of thethruster. A range of brake discs is available from Twiflex (seeDisc and Hub Assemblies).

For pneumatic operation use dry, filtered and non-lubricatedcompressed air. Pneumatic brakes require a control valve,operated either manually or by pneumatic or electrical signal.

The ratings shown on the graphs are based on fully beddedin and conditioned brake pads with a nominal frictioncoefficient μ = 0.4. Twiflex disc brakes must be used withTwiflex asbestos free brake pads.

Effective disc radius = actual radius (m) – 0.03m.

Maximum Pressure 7 barMaximum Braking Force = 2.76kN @ 7 barWeight of caliper and thruster - 2.8kgWeight of thruster only - 1.3kgVolume displacement of thruster at full stroke = 300ml

MSWIFLEXT

227(8.9)

165 (6.5)

140 (5.5)

135 (5.3)

TTWIFLEXWIFLEXMSMS

165 (6.5)135 (5.3)

ø 120(ø 4.7)

216(8.5)

250 300 350 400 460 515 6107

6

5

4

3

2

1

0

Disc Diameter mm

Air

Pre

ssu

re –

ba

r

0 50 100 150 200 250 300 350 400

Braking Torque Nm

250 300 350 400 460 515 6107

6

5

4

3

2

1

0

Disc Diameter mm

Air

Pres

sure

– b

ar

0 50 100 150 200 250 300 350 400

Braking Torque Nm

MSA Pneumatically Applied – Spring Released

Maximum Pressure 7 barMaximum Braking Force = 1.44kN @ 7 barWeight of caliper and thruster - 2.5kgWeight thruster only - 1.0gVolume displacement of thruster at full stroke = 150ml

135 (5.3)

73 (2.9)

12.7(0.5)

20.5 (0.8)to disc edge

2 holes ø 14 (ø 0.55)87 Nm (M12-64 lb.ft.)

165 (6.5)

121 (4.8)

137(5.4)

MS Series

MSD Pneumatically Applied – Spring Released

Retraction pressures where shown are calculated and may vary depending on spring tolerance.

Page 11: Industrial Disc Brakes - BIBUS

9P-1648-TF 11/10 Twiflex +44 (0) 20 8894 1161

MSE Pneumatically Applied – Spring Released

Maximum Pressure 7 barMaximum Braking Force = 0.29kN @ 7 barWeight of caliper and thruster - 1.91kg

Weight of thruster only - 0.41kgVolume displacement of thruster at full stroke = 8ml

TTWIFLEXWIFLEXMSMS

234(9.2)

165 (6.5)

ø 80(ø 3.1)

135 (5.3)

73(2.9)

TTWIFLEXWIFLEXMSMS

234(9.2)

165 (6.5)

ø 80(ø 3.1)

135 (5.3)

73(2.9)

TTWIFLEXWIFLEXMSMS

216(8.5)

165 (6.5)

121(4.8)

73(2.9)

135 (5.3)

TTWIFLEXWIFLEXMSMS

165 (6.5)135 (5.3)

73(2.9)

ø 94(ø 3.7)

240(9.5)

250 300 350 400 460 515 6107

6

5

4

3

2

1

0

Disc Diameter mm

Air

Pres

sure

– b

ar

0 10 20 30 40 50 60 70 80 90

Braking Torque Nm

250 300 350 400 460 515 610Disc Diameter mm

Air

Pres

sure

– b

ar

0 20 40 60 80 100 120 140 160 180 200 220

7

6

5

4

3

2

1

0

Braking Torque Nm

250 300 350 400 460 515 610Disc Diameter mm

Forc

e on

leve

r –

N

0 50 100 150 200 250 300 350 400 450 500 550

1000

800

600

400

200

0

Braking Torque Nm

250 300 350 400 460 515 610Disc Diameter mm

Forc

e-N

0 50 100 150 200 250 300

1800

1600

1400

1200

1000

800

600

400

200

0

TWIFLEXMS

Braking Torque Nm

Maximum Pressure 7 barMaximum Braking Force = 0.76kN @ 7 barWeight of caliper and thruster - 1.89kg

Weight of thruster only - 0.39kgVolume displacement of thruster at full stroke = 21ml

Maximum Braking Force = 1.88kN @ 0.8kN force on lever

Weight of caliper and lever assembly - 2.13kgWeight of lever assembly only - 0.63kg

MSH Mechanically Applied – Hand Operated

Maximum Braking Force = 1.01kNWeight of caliper and hand wheel assembly - 2.53kg

Weight of hand wheel assembly only - 1.03kg

MS Series

MSF Mechanically Applied – Lever Operated

MSG Pneumatically Applied – Spring Released

Retraction pressures where shown are calculated and may vary depending on spring tolerance.

Page 12: Industrial Disc Brakes - BIBUS

10 Twiflex +44 (0) 20 8894 1161 P-1648-TF 11/10

TTWIFLEXWIFLEXMSMS

264(10.4)

165 (6.5)135(5.3)

73(2.9)

ø 182 (ø 7.2)

TTWIFLEXWIFLEXMSMS

165 (6.5)135(5.3)

73(2.9)

304(12.0)

250 300 350 400 460 515 6100

1

2

3

4

Disc Diameter mm

Air

Pres

sure

– b

ar

0 100 200 300 400 500 600 700 800

Braking Torque Nm (Full Rate)

250 300 350 400 460 515 610Disc Diameter mm

Air

Pres

sure

– b

ar

0 100 200 300 400 500

0

1

2

3

Braking Torque Nm (2/3rd Rate)

250 300 350 400 460 515 610Disc Diameter mm

Air

Pres

sure

– b

ar

0 50 100 150 200 250

0

0.5

1

1.5

Braking Torque Nm (1/3rd Rate)

250 300 350 400 460 515 610Disc Diameter mm

Oil P

ress

ure

– ba

r

0 100 200 300 400 500 600 700 800

0

10

20

30

40TWIFLEX

MS

Braking Torque Nm (Full Rate)

250 300 350 400 460 515 610Disc Diameter mm

Oil P

ress

ure

– ba

r

0 100 200 300 400 500

0

5

10

15

20

25

30

Braking Torque Nm (2/3rd Rate)

250 300 350 400 460 515 610Disc Diameter mm

Oil P

ress

ure

– ba

r

0 50 100 150 200 250

0

5

10

15

Braking Torque Nm (1/3rd Rate)

MSL Spring Applied – Hydraulically Released, Self Adjusting

Maximum Braking Force full rate: 2.6kNMinimum Pressure for full retraction: 50 barWeight of caliper and thruster - 5.5kg

Weight of thruster only - 4kgVolume displacement of thruster at 4mm retraction = 5ml

Maximum Braking Force 1/3rd rate: 0.87kNMinimum Pressure for full retraction: 17 barWeight of caliper and thruster - 5.5kg

Weight of thruster only - 4kgVolume displacement of thruster at 4mm retraction = 5ml

Maximum Braking Force 2/3rd rate: 1.74kNMinimum Pressure for full retraction: 33 barWeight of caliper and thruster - 5.5 kg

Weight of thruster only - 4kgVolume displacement of thruster at 4mm retraction = 5ml

MS SeriesMSK Spring Applied – Pneumatically Released, Self Adjusting

Maximum Braking Force 1/3rd rate: 0.87kNMinimum Pressure for full retraction: 1.7 barWeight of caliper and thruster - 4.9kg

Weight of thruster only - 3.4kgVolume displacement of thruster at full retraction = 950ml

Maximum Braking Force 2/3rd rate: 1.74kNMinimum Pressure for full retraction: 3.3 barWeight of caliper and thruster - 4.9kg

Weight of thruster only - 3.4kgVolume displacement of thruster at full retraction = 950ml

Maximum Braking Force full rate: 2.6kNMinimum Pressure for full retraction: 5 barWeight of caliper and thruster - 4.9kg

Weight of thruster only - 3.4kgVolume displacement of thruster at full retraction = 950ml

Retraction pressures where shown are calculated and may vary depending on spring tolerance.

Page 13: Industrial Disc Brakes - BIBUS

11P-1648-TF 11/10 Twiflex +44 (0) 20 8894 1161

MR Series

MR Disc Brake Caliper Range

The Twiflex MR series of disc brake calipers is suitable foruse with discs of 12.7mm or 25.4mm thick. Minimum discdiameter is 250mm. Minimum disc diameter for the MR2 is460mm.

Normally one or two calipers are used per disc, but thenumber may be increased depending on disc size. Thebrakes may be positioned at any angle around the peripheryof the disc, but should ideally be mounted horizontally (i.e. atthe 3 o’clock or 9 o’clock position). If the caliper mountingangle is greater than 10° from the horizontal, or on verticalshaft applications, it should be fitted with an equalising link.A range of brake discs is available from Twiflex (see Disc andHub Assemblies).

For pneumatic operation use dry, filtered and non-lubricatedcompressed air. Pneumatic brakes require a control valve,operated either manually or by pneumatic or electrical signal.

The ratings shown on the graphs are based on fully beddedin and conditioned brake pads with a nominal frictioncoefficient μ = 0.4. Twiflex disc brakes must be used withTwiflex asbestos free brake pads.

Effective disc radius = actual radius (m) – 0.03m.

233(9.2)

106.4(4.2)

155.6 (6.1)

A

12.7 (0.5)

12.7 (0.5)

79.4 (3.1)

3 Holes Ø13 (Ø0.5)87Nm (M12-94 lb.ft)

36.5

(1.4

4)To

dis

c ed

ge

233(9.2)

106.4(4.2)

155.6 (6.1)

A 141 (5.6)

12.7 (0.5)

12.7 (0.5)

3 Holes Ø13 (Ø0.5)87Nm (M12-64 lb.ft)

36.5

(1.4

4)To

dis

c ed

ge

MR2

MR

Retraction pressures where shown are calculated and may vary depending on spring tolerance.

Disc Brake Caliper

Disc Brake Caliper

DiscThickness A

MR13 13 181 MR25 25 194

DiscThickness A

MR13 13 181 MR25 25 194

Page 14: Industrial Disc Brakes - BIBUS

12 Twiflex +44 (0) 20 8894 1161 P-1648-TF 11/10

259(10.2)

254 (10.0) 140(5.5

250 300 350 400 460 515 610 710 810 9157

6

5

4

3

2

1

0

Disc Diameter mm

Air

Pre

ssu

re –

ba

r

0 300 600 900 1200 1500 1800 2100 2400 2700 3000

Braking Torque Nm

280(11.0)

251 (9.9) 182 (7.2)

250 300 350 400 460 515 610 710 810 915Disc Diameter mm

Air

Pre

ssu

re –

ba

r

0 500 1000 1500 2000 2500 3000 3500 4000 4500 5000

7

6

5

4

3

2

1

0

Braking Torque Nm

120 (4.7)238 (9.4)

248(9.8)

250 300 350 400 460 515 610 710 810 9157

6

5

4

3

2

1

0

Disc Diameter mm

Air

Pre

ssu

re –

ba

r

0 200 400 600 800 1000 1200 1400 1600

Braking Torque Nm

240(9.5)

257 (10.1) 81(3.1)

250 300 350 400 460 515 610 710 810 915Disc Diameter mm

Air

Pre

ssu

re –

ba

r

0 50 100 150 200 250 300 350

7

6

5

4

3

2

1

0

Braking Torque Nm

Maximum Pressure 7 barMaximum Braking Force = 3.5kN @ 7 barWeight of MR caliper and thruster - 7.65kgWeight of MR2 caliper and thruster - 8.15kg

Weight thruster only - 1.15kgVolume displacement of thruster at full stroke = 150ml

Maximum Pressure 7 barMaximum Braking Force = 0.74kN @ 7 barWeight of MR caliper and thruster - 6.84kgWeight of MR2 caliper and thruster - 7.34kg

Weight of thruster only - 0.34kgVolume displacement of thruster at full stroke = 25ml

MR SeriesMRA Pneumatically Applied – Spring Released

MRB Pneumatically Applied – Spring Released

MRD Pneumatically Applied – Spring Released

MRE Pneumatically Applied – Spring Released

Maximum Pressure 7 barMaximum Braking Force = 6.9kN @ 7 barWeight of MR caliper and thruster - 7.82kgWeight of MR2 caliper and thruster - 8.32kg

Weight of thruster only - 1.32kgVolume displacement of thruster at full stroke = 300

Maximum Pressure 7 barMaximum Braking Force = 10.8kN @ 7 barWeight of MR caliper and thruster - 8.56kgWeight of MR2 caliper and thruster - 9.06kg

Weight of thruster only - 2.06kgVolume displacement of thruster at full stroke = 426ml

Retraction pressures where shown are calculated and mayvary depending on spring tolerance.

Page 15: Industrial Disc Brakes - BIBUS

13P-1648-TF 11/10 Twiflex +44 (0) 20 8894 1161

Maximum Pressure 7 barMaximum Braking Force = 1.9kN @ 7 barWeight of MR caliper and thruster - 6.8kg

Weight of MR2 caliper and thruster - 7.3kgWeight of thruster only - 0.3kgVolume displacement of thruster at fullstroke = 64ml

257 (10.1)80

(3.2)

240(9.5)

250 300 350 400 460 515 610 710 810 9157

6

5

4

3

2

1

0

Disc Diameter mm

Air

Pres

sure

– b

ar

0 100 200 300 400 500 600 700 800

Braking Torque Nm

80(3.2)

216 (8.5)

364(14.3)

250 300 350 400 460 515 610 710 810 915Disc Diameter mm

Forc

e on

Lev

er –

N

0 500 1000 1500 2000 2500 3000 3500

900

800

700

600

500

400

300

200

100

0

Braking Torque Nm

240(9.5)

257 (10.1) 80(3.2)

250 300 350 400 460 515 610 710 810 9151800

1600

1400

1200

1000

800

600

400

200

0

Disc Diameter mm

For

ce –

N

0 100 200 300 400 500 600 700 800 900 1000 1100

Braking Torque Nm

Weight of MR caliper and thruster - 7.9kgWeight of MR2 caliper and thruster - 8.4kg

Weight of lever assembly only - 1.4kgMaximum Braking Force = 8.3kN @ 0.9kNforce on lever

Weight of MR caliper and hand wheelassembly - 7.8kgWeight of MR2 caliper and hand wheel -8.3kg

Weight of hand wheel assembly only - 1.3kgMaximum Braking Force = 2.68kN

MR SeriesMRG Pneumatically Applied – Spring Released

MRH Mechanically Applied – Lever Operated

MRW Mechanically Applied – Hand Operated

Retraction pressures where shown are calculated and may vary depending on spring tolerance.

Page 16: Industrial Disc Brakes - BIBUS

14 Twiflex +44 (0) 20 8894 1161 P-1648-TF 11/10

Minimum Pressure for full retraction: 1.7 barMaximum Braking Force 1/3rd rate: 2.2kNWeight of MR caliper and thruster - 10.0kgWeight of MR2 caliper and thruster - 10.5kg

Weight of thruster only - 3.5kgVolume displacement of thruster at fullretraction is 950ml

Minimum Pressure for full retraction: 3.3 barMaximum Braking Force 2/3rd rate: 4.3kNWeight of MR caliper and thruster - 10.0kgWeight of MR2 caliper and thruster - 10.5kg

Weight of thruster only - 3.5kgVolume displacement of thruster at fullretraction is 950ml

Disc Diameter mm 250 300 350 400 460 515 610 710 810 915

Air

Pres

sure

– b

ar

0 200 400 600 800 1000 1200 1400 1600 1800 2000

0

1

2

3

Braking Torque Nm (2/3rd Rate)

Disc Diameter mm 250 300 350 400 460 515 610 710 810 915

Air

Pres

sure

– b

ar

0 200 400 600 800 1000

0

0.5

1

1.5

Braking Torque Nm (1/3rd Rate)

Minimum Pressure for full retraction: 5 barMaximum Braking Force full rate: 6.4kNWeight of MR caliper and thruster - 10.0kgWeight of MR2 caliper and thruster - 10.5kg

Weight of thruster only - 3.5kgVolume displacement of thruster at fullretraction is 950ml

286 (11.3)

280(11.0)

182 (7.2)

0

1

2

3

4

Disc Diameter mm

Air

Pres

sure

– b

ar

250 300 350 400 460 515 610 710 810 915

0 400 800 1200 1600 2000 2400 2800

Braking Torque Nm (Full Rate)

Disc Diameter mm 250 300 350 400 460 515 610 710 810 915

Oil P

ress

ure

– ba

r

0 400 800 1200 1600 2000

0

5

10

15

20

25

30

Braking Torque Nm (2/3rd Rate)

Disc Diameter mm 250 300 350 400 460 515 610 710 810 915

Oil P

ress

ure

– ba

r

0 200 400 600 800 1000

0

5

10

15

Braking Torque Nm (1/3rd Rate)

280(11.0)

328 (12.9) 182 (7.2)

Disc Diameter mm 250 300 350 400 460 515 610 710 810 915

Oil P

ress

ure

– ba

r

0 400 800 1200 1600 2000 2400 2800

0

10

20

30

40

Braking Torque Nm (Full Rate)

MRL Spring Applied – Hydraulically Released, Self Adjusting

Minimum Pressure for full retraction: 50 barMaximum Braking Force full rate: 6.4kNWeight of MR caliper and thruster - 10.5kgWeight of MR2 caliper and thruster - 11kg

Weight of thruster only - 4kgVolume displacement of thruster at 4mmretraction = 5ml

Minimum Pressure for full retraction: 17 barMaximum Braking Force 1/3rd rate: 2.2kNWeight of MR caliper and thruster - 10.5kgWeight of MR2 caliper and thruster - 11kg

Weight of thruster only - 4kgVolume displacement of thruster at 4mmretraction = 5ml

Minimum Pressure for full retraction 33 barMaximum Braking Force 2/3rd rate: 4.3kNWeight of MR caliper and thruster - 10.5kgWeight of MR2 caliper and thruster - 11kg

Weight of thruster only - 4kgVolume displacement of thruster at 4mmretraction = 5ml

MR SeriesMRK Spring Applied – Pneumatically Released, Self Adjusting

Retraction pressures where shown are calculated and may varydepending on spring tolerance.

Page 17: Industrial Disc Brakes - BIBUS

15P-1648-TF 11/10 Twiflex +44 (0) 20 8894 1161

MX SeriesMX Disc Brake Caliper Range

The Twiflex MX13, MX25, MX30 and MX40 series of discbrake calipers is suitable for use with discs of 12.7mm,25.4mm, 30mm and 40mm thick respectively. The SMXcaliper is only suitable for use with discs 12.7mm thick.Minimum disc diameter is 300mm.

The MX/SMX calipers may be used with any of the Twiflexseries of thrusters and feature a patented link mechanism toensure uniform pad wear.

Normally one or two calipers are used per disc, but thenumber may be increased depending on disc size. Thebrakes may be positioned at any angle around the peripheryof the disc, but should ideally be mounted horizontally (i.e. atthe 3 o’clock or 9 o’clock position). If the caliper mountingangle is greater than 10° from the horizontal, or on vertical

shaft applications, it should be fitted with an inclinedmounting kit or equalising link. A range of brake discs isavailable from Twiflex (see Disc and Hub Assemblies).

For pneumatic operation use dry, filtered and non-lubricatedcompressed air. Pneumatic brakes require a control valve,operated either manually or by pneumatic or electrical signal.

The ratings shown on the graphs are based on fully beddedin and conditioned brake pads with a nominal frictioncoefficient μ = 0.4. Twiflex disc brakes must be used withTwiflex asbestos free brake pads.

Effective disc radius = actual radius (m) – 0.033m.

102 (4.0)

12.7 (0.5)

96 (3.8)

224(8.8)

64(2.5)

52(2.05)

24 (0.95)to disc edge

A

B

3 holes ø13 (M12-80Nm)

TYPE SMX 13BRAKE CALIPER

127 (5.0)

155 (6.1)

4 Holes Ø 14 (0.55)(M12 - 80Nm)

137 (5.4)

45 (1.8)

224(8.8)

180 (7.1)To disc edge

WIFLEX T

SMX

MX Disc Brake Caliper

Disc Brake Caliper

Retraction pressures where shown are calculated and may vary depending on spring tolerance.

DiscThickness A B

MX13 13 130 75MX25 25 134 84MX30 30 142 75MX40 40 150 84

Page 18: Industrial Disc Brakes - BIBUS

16 Twiflex +44 (0) 20 8894 1161 P-1648-TF 11/10

206 (8.1)52

(2.05)

ø140(ø5.5)

268(10.6)

206 (8.1) 52(2.05)

ø182(ø7.2)

289(11.4)

200 (7.9)

254 (9.4)

52 (2.05)

Ø120 (Ø4.7)

210 (8.3) 102(4.0)

ø80(ø3.1)

238(9.4)

300 350 400 460 515 610 710 810 9157

6

5

4

3

2

1

0

Disc Diameter mm

Air

Pres

sure

– b

ar

0 300 600 900 1200 1500 1800 2100 2400 2700 3000

Braking Torque Nm

300 350 400 460 515 610 710 810 915Disc Diameter mm

Air

Pres

sure

– b

ar

0 500 1000 1500 2000 2500 3000 3500 4000 4500 5000

7

6

5

4

3

2

1

0

Braking Torque Nm

300 350 400 460 515 610 710 810 9157

6

5

4

3

2

1

0

Disc Diameter mm

Air

Pres

sure

– b

ar

0 200 400 600 800 1000 1200 1400 1600

Braking Torque Nm

300 350 400 460 515 610 710 810 915Disc Diameter mm

Air

Pres

sure

– b

ar

0 50 100 150 200 250 300 350

7

6

5

4

3

2

1

0

Braking Torque Nm

Maximum Pressure 7 barMaximum Braking Force = 11kN @ 7 barWeight of caliper and thruster - 9.06kg

Weight of thruster only - 2.06kgVolume displacement of thruster at full stroke = 426ml

Maximum Pressure 7 barMaximum Braking Force = 0.74kN @ 7 barWeight of caliper and thruster - 7.34kg

Weight of thruster only - 0.34kgVolume displacement of thruster at full stroke = 25ml

MX SeriesMXA Pneumatically Applied – Spring Released

MXB Pneumatically Applied – Spring Released

MXD Pneumatically Applied – Spring Released

MXE Pneumatically Applied – Spring Released

Maximum Pressure 7 barMaximum Braking Force = 6.9kN @ 7 barWeight of caliper and thruster - 8.32kg

Weight of thruster only - 1.32kgVolume displacement of thruster at full stroke = 300ml

Maximum Pressure 7 barMaximum Braking Force = 3.6kN @ 7 barWeight of caliper and thruster - 8.15kg

Weight thruster only - 1.15kgVolume displacement of thruster at full stroke = 150ml

Retraction pressures where shown are calculated and may vary depending on spring tolerance.

Page 19: Industrial Disc Brakes - BIBUS

MXG Pneumatically Applied – Spring Released

17P-1648-TF 11/10 Twiflex +44 (0) 20 8894 1161

210 (8.3) 102(4.0)

238(7.6)

ø80(ø3.2)

52(2.05)

209 (8.3) 102(4.0)

391(15.4)

52(2.05)

214 (8.4)

236(7.9)

102(4.0)

52(2.05)

ø75(ø2.9)

300 350 400 460 515 610 710 810 9157

6

5

4

3

2

1

0

Air

Pres

sure

– b

ar

0 100 200 300 400 500 600 700 800 900

Disc Diameter mm

Braking Torque Nm

300 350 400 460 515 610 710 810 915Disc Diameter mm

Forc

e on

leve

r –

N

0 500 1000 1500 2000 2500 3000 3500

900

800

700

600

500

400

300

200

100

0

Braking Torque Nm

300 350 400 460 515 610 710 810 915 Disc Diameter mm

Sprin

g Fo

rce

– N

0 100 200 300 400 500 600 700 800 900 1000 1100

1800

1600

1400

1200

1000

800

600

400

200

0

Braking Torque Nm

Weight of caliper and lever assembly - 8.4kgWeight of lever assembly only - 1.4kg

Maximum Braking Force = 8.3kN @ 0.9kN force on lever

Weight of caliper and hand wheel assembly - 8.3kgWeight of hand wheel assembly only - 1.3kg

Maximum Braking Force = 2.68kN

MXH Mechanically Applied – Lever Operated

MXW Mechanically Applied – Hand Operated

MX Series

Maximum Pressure 7 barMaximum Braking Force = 1.9kN @ 7 barWeight of caliper and thruster - 7.3kg

Weight of thruster only - 0.3kgVolume displacement of thruster at full stroke = 64ml

Retraction pressures where shown are calculated and may vary depending on spring tolerance.

Page 20: Industrial Disc Brakes - BIBUS

MXEA Spring Applied – Electrically Released, Self Adjusting

18 Twiflex +44 (0) 20 8894 1161 P-1648-TF 11/10

MX Series

The EA actuator is a spring applied, electricallyreleased unit designed for use with the Twiflex MXrange of disc brake calipers. A 175W pancake motordrives a ball screw mechanism, retracting the brake.

A feature of the unit is a patented self-adjustingmechanism which maintains a constant air gap (andconsequently braking force) between pad and discas the pads wear.

The assembly is contained in a rugged, castaluminium housing, designed for service in theharshest environments, which mounts directly to onearm of the MX caliper.

The MXEA is supplied complete with a solid statecontroller, suitable for all AC supply voltages, whichconverts the supply to the required DC output for thepancake motor. A 24VDC unit is also available. Thebrake is released when power to the controller isswitched on, and applied when power isdisconnected. Controlled application of the brakeoccurs, electrically damped by using the motor backE.M.F. and a damping resistor.

The controller is housed in a strong, steel, wallmounted enclosure (215mm x 215mm x 150mmdeep), protected to IP44 as standard (higher ratingon request).

Braking force adjustable to 50% of maximum.

Maximum Braking Force = 6kN Weight of caliper and actuator - 15.7kg

Weight actuator only - 8.7kgWeight of controller - 5.5kg

Retraction pressures where shown are calculated and may vary depending on spring tolerance.

307 (12)

327 (12.9)

226 (9) 315 (12.4)

Page 21: Industrial Disc Brakes - BIBUS

MXS Spring Applied – Pneumatically Released, Self Adjusting

19P-1648-TF 11/10 Twiflex +44 (0) 20 8894 1161

Minimum Pressure for full retraction: 6.5 barMaximum Braking Force XS 9.6: 14.3kNWeight of caliper and thruster - 12.1kg

Weight of thruster only - 5.1kgVolume displacement of thruster at fullretraction = 1.19 l

295(11.6)

52(2.05)

A

ø196 (ø7.7)

300 350 400 460 515 610 710 810 9150

1

2

3

4

5

6

Disc Diameter mm

Air

Pres

sure

– b

ar

0 1000 2000 3000 4000 5000 6000

Braking Torque Nm (XS 9.6)

300 350 400 460 515 610 710 810 915Disc Diameter mm

Air

Pres

sure

– b

ar

0 500 1000 1500 2000 2500 3000

0

1

2

3

Braking Torque Nm (XS 4.6)

300 350 400 460 515 610 710 810 915Disc Diameter mm

Air

Pres

sure

– b

ar

0 500 1000 1500 2000 2500 3000 3500 4000 4500 5000

0

1

2

3

4

5

Braking Torque Nm (XS 7.5)

A

267(10.5)

ø140(ø5.5)

52(2.05)

300 350 400 460 515 610 710 810 915Disc Diameter mm

Oil P

ress

ure

– ba

r

0 1000 2000 3000 4000 5000 6000

0

10

20

30

40

50

60

70

Braking Torque Nm (XSH 9.6)

300 350 400 460 515 610 710 810 915Disc Diameter mm

Oil P

ress

ure

– ba

r

0 500 1000 1500 2000 2500 3000

0

5

10

15

20

25

30

35

Braking Torque Nm (XSH 4.6)

300 350 400 460 515 610 710 810 915Disc Diameter mm

Oil P

ress

ure

– ba

r

0 500 1000 1500 2000 2500 3000 3500 4000 4500 5000

0

10

20

30

40

50

60

Braking Torque Nm (XSH 7.5)

MXSH Spring Applied – Hydraulically Released, Self Adjusting

Minimum Pressure for full retraction: 82 barMaximum Braking Force XSH 9.6: 14.3kNWeight of caliper and thruster - 11.6kg

Weight of thruster only - 4.6kgVolume displacement of thruster at 6mmretraction = 9.1ml

Minimum Pressure for full retraction: 40 barMaximum Braking Force XSH 4.6: 6.8kNWeight of caliper and thruster - 11kg

Weight of thruster only - 4kgVolume displacement of thruster at 6mmretraction = 9.1ml

Minimum Pressure for full retraction: 65 barMaximum Braking Force XSH 7.5: 11.2kNWeight of caliper and thruster - 11.4kg

Weight of thruster only - 4.4kgVolume displacement of thruster at 6mmretraction = 9.1ml

MX Series

Minimum Pressure for full retraction: 3 barMaximum Braking Force XS 4.6: 6.8kNWeight of caliper and thruster - 11.5kg

Weight of thruster only - 4.5kgVolume displacement of thruster at fullretraction = 1.19 l

Minimum Pressure for full retraction: 5 barMaximum Braking Force XS 7.5: 11.2kNWeight of caliper and thruster - 11.9kg

Weight of thruster only - 4.9kgVolume displacement of thruster at fullretraction = 1.19 l

Retraction pressures where shown are calculated and may vary depending on spring tolerance.

AXS 9.6 281 XS 7.5 270XS 4.6 270

AXSH 9.6 315XSH 7.5 290XSH 4.6 290

Page 22: Industrial Disc Brakes - BIBUS

MXK Spring Applied – Pneumatically Released, Self Adjusting

Minimum Pressure for full retraction: 5 barMaximum Braking Force full rate: 6.4kNWeight of caliper and thruster - 10.5kg

Weight of thruster only - 3.5kgVolume displacement of thruster at full retraction = 950ml

288(11.3)

241 (9.5)

182 (7.2)

52(2.05)

300 350 400 460 515 610 710 810 9150

1

2

3

4

5

6

Disc Diameter mm

Air

Pre

ssu

re –

ba

r

0 400 800 1200 1600 2000 2400 2800

Braking Torque Nm (Full Rate)

300 350 400 460 515 610 710 810 915Disc Diameter mm

Air

Pre

ssu

re –

ba

r

0 200 400 600 800 1000

0

1.5

1

0.5

2

Braking Torque Nm (1/3rd Rate)

300 350 400 460 515 610 710 810 915Disc Diameter mm

Air

Pre

ssu

re –

ba

r

0 400 800 1200 1600 2000

0

3

2

1

4

Braking Torque Nm (2/3rd Rate)

Minimum Pressure for full retraction: 1.7 barMaximum Braking Force 1/3 rate: 2.2kNWeight of caliper and thruster - 10.5kg

Weight of thruster only - 3.5kgVolume displacement of thruster at full retraction = 950ml

Minimum Pressure for full retraction: 3.3 barMaximum Braking Force 2/3 rate: 4.3kNWeight of caliper and thruster - 10.5kg

Weight of thruster only - 3.5kgVolume displacement of thruster at full retraction = 950ml

300 350 400 460 515 610 710 810 9150

1

2

Disc Diameter mm

Air

Pre

ssu

re –

ba

r

0 200 400 600 800 1000 1200 1400

Braking Torque Nm (1/2 Rate)

1.5

0.5

Minimum Pressure for full retraction: 2.5 barMaximum Braking Force 1/2 rate: 3.2kNWeight of caliper and thruster - 10.5kg

Weight of thruster only - 3.5kgVolume displacement of thruster at full retraction = 950ml

20 Twiflex +44 (0) 20 8894 1161 P-1648-TF 11/10

MX Series

Retraction pressures where shown are calculated and may vary depending on spring tolerance.

Page 23: Industrial Disc Brakes - BIBUS

Minimum Pressure for full retraction: 50 barMaximum Braking Force full rate: 6.4kNWeight of caliper and thruster - 11kg

Weight of thruster only - 4.0kgVolume displacement of thruster at 4mm retraction = 5ml

288(11.3)

182 (7.2)

282 (11.1) 52(2.05)

300 350 400 460 515 610 710 810 9150

Disc Diameter mm

Air

Pre

ssu

re –

ba

r

0 400 800 1200 1600 2000 2400 2800

Braking Torque Nm (Full Rate)

20

30

10

40

300 350 400 460 515 610 710 810 915Disc Diameter mm

Air

Pre

ssu

re –

ba

r

0 200 400 800 1000 1200

0

10

5

15

Braking Torque Nm (1/3rd Rate)

300 350 400 460 515 610 710 810 915Disc Diameter mm

Air

Pre

ssu

re –

ba

r

0 400 800 1200 1600 2000

0

25

20

10

5

15

30

Braking Torque Nm (2/3rd Rate)

MXL Spring Applied – Hydraulically Released, Self Adjusting

Minimum Pressure for full retraction: 17 barMaximum Braking Force 1/3rd rate: 2.2kNWeight of caliper and thruster - 11kg

Weight of thruster only - 4.0kgVolume displacement of thruster at 4mm retraction = 5ml

Minimum Pressure for full retraction: 33 barMaximum Braking Force 2/3 rate: 4.3kNWeight of caliper and thruster - 11kg

Weight of thruster only - 4.0kgVolume displacement of thruster at 4mm retraction = 5ml

21P-1648-TF 11/10 Twiflex +44 (0) 20 8894 1161

MX Series

Retraction pressures where shown are calculated and may vary depending on spring tolerance.

Page 24: Industrial Disc Brakes - BIBUS

22 Twiflex +44 (0) 20 8894 1161 P-1648-TF 11/10

160 (6.3)

84 (3.3)

A

324(12.8)

64(2.5)

22 (0.87)to disc edge

12.7 (0.5)

96 (3.8)3 holes ø 13 (ø0.51)M12-87 Nm (M12-64 lb.ft.)

324(12.8)

45(1.77)

97 (3.8)to disc edge

170 (6.7)

4 holes ø 18 (ø0.71)M16-200Nm (M16-148 lb.ft.)

152 (6.0)

124 (4.9)

SGMX Disc Brake Caliper

GMX Disc Brake Caliper

GMX SeriesGMX Disc Brake Caliper Range

The Twiflex GMX series of disc brake calipers is similar to theMX range but offers greater pad area. The GMX25, GMX30and GMX40 are suitable for use with discs of 25.4mm,30mm and 40mm thick respectively. The SGMX caliper isonly suitable for use with discs 25.4mm think. Minimum discdiameter is 610mm.

The GMX/SGMX calipers may be used with any of theTwiflex series of thrusters and feature a patented linkmechanism to ensure uniform pad wear.

Normally one or two calipers are used per disc, but thenumber may be increased depending on disc size. Thebrakes may be positioned at any angle around the peripheryof the disc, but should ideally be mounted horizontally (i.e. at

the 3 o’clock or 9 o’clock position). If the caliper mountingangle is greater than 10° from the horizontal, or on verticalshaft applications, it should be fitted with an inclinedmounting kit or equalising link. A range of brake discs isavailable from Twiflex (see Disc and Hub Assemblies).

For pneumatic operation use dry, filtered and non-lubricatedcompressed air. Pneumatic brakes require a control valve,operated either manually or by pneumatic or electrical signal.

The ratings shown on the graphs are based on fully beddedin and conditioned brake pads with a nominal frictioncoefficient μ = 0.4. Twiflex disc brakes must be used withTwiflex asbestos free brake pads.

Effective disc radius = actual radius (m) – 0.06m.

Retraction pressures where shown are calculated and may vary depending on spring tolerance.

DiscThickness A

GMX25 25 152GMX30 30 155GMX40 40 162

Page 25: Industrial Disc Brakes - BIBUS

GMXA Pneumatically Applied – Spring Released

23P-1648-TF 11/10 Twiflex +44 (0) 20 8894 1161

GMX GMXTWIFLEX TWIFLEX

WIFLEX WIFLEXTTTYPE GMXTYPE GMX

BRAKE CALIPERBRAKE CALIPER

300 (11.8)

373(14.7)

160(6.3)

GMXTWIFLEX

WIFLEXTTYPE GMX

BRAKE CALIPER

610 710 810 9157

6

5

4

3

2

1

0

Disc Diameter mm

Air

Pres

sure

– b

ar

0 300 600 900 1200 1500 1800 2100 2400 2700 3000

Braking Torque Nm

TWIFLEX TWIFLEX

GMX GMX

BRAKE CALIPERBRAKE CALIPERTYPE GMXTYPE GMXTT WIFLEX WIFLEX

218 (8.6) ø182(ø7.2)

395(15.6)

TWIFLEX

GMX

BRAKE CALIPERTYPE GMXT WIFLEX

0 500 1000 1500 2000 2500 3000 3500 4000 4500

610 710 810 9157

6

5

4

3

2

1

0

Disc Diameter mm

Air

Pres

sure

– b

ar

Braking Torque Nm

TWIFLEX TWIFLEX

GMX GMX

BRAKE CALIPERBRAKE CALIPERTYPE GMXTYPE GMX

TT WIFLEX WIFLEX

205 (8.1)

363(14.3)

160(6.3)

TWIFLEX

GMX

BRAKE CALIPERTYPE GMX

T WIFLEX

0 200 400 600 800 1000 1200 1400 1600

610 710 810 9157

6

5

4

3

2

1

0

Disc Diameter mm

Air

Pres

sure

– b

ar

Braking Torque Nm

TWIFLEX TWIFLEX

GMX GMX

BRAKE CALIPERBRAKE CALIPERTYPE GMXTYPE GMX

TT WIFLEX WIFLEX

223 (8.8)

344(13.5)

160(6.3)

TWIFLEX

GMX

BRAKE CALIPERTYPE GMX

T WIFLEX

610 710 810 9157

6

5

4

3

2

1

0

Disc Diameter mm

Air

Pres

sure

– b

ar

0 50 100 150 200 250 300

Braking Torque Nm

Maximum Pressure 7 barMaximum Braking Force = 11kN @ 7 barWeight of caliper and thruster - 11.28kg

Weight of thruster only - 2.06kgVolume displacement of thruster at fullstroke = 426ml

Maximum Pressure 7 barMaximum Braking Force = 3.6kN @ 7 barWeight of caliper and thruster - 10.37kg

Weight of thruster only - 1.15kgVolume displacement of thruster at fullstroke = 150ml

Maximum Pressure 7 barMaximum Braking Force = 0.74kN @ 7 barWeight of caliper and thruster - 9.56kg

Weight of thruster only - 0.34kgVolume displacement of thruster at fullstroke = 25ml

GMX Series

GMXB Pneumatically Applied – Spring Released

GMXD Pneumatically Applied – Spring Released

GMXE Pneumatically Applied – Spring Released

Retraction pressures where shown are calculated and may vary depending on spring tolerance.

Maximum Pressure 7 barMaximum Braking Force = 6.9kN @ 7 barWeight of caliper and thruster - 10.54kg

Weight of thruster only - 1.32kgVolume displacement of thruster at fullstroke = 300ml

Page 26: Industrial Disc Brakes - BIBUS

24 Twiflex +44 (0) 20 8894 1161 P-1648-TF 11/10

Maximum Pressure 7 barMaximum Braking Force = 1.9kN @ 7 barWeight of caliper and thruster - 9.52kg

Weight of thruster only - 0.3kgVolume displacement of thruster at fullstroke = 64ml

TWIFLEX TWIFLEX

GMX GMX

BRAKE CALIPERBRAKE CALIPERTYPE GMXTYPE GMX

TT WIFLEX WIFLEX

344(13.5)

160(6.3)223 (8.8)

TWIFLEX

GMX

BRAKE CALIPERTYPE GMX

T WIFLEX

0 100 200 300 400 500 600 700 800

610 710 810 9157

6

5

4

3

2

1

0

Disc Diameter mm

Air

Pres

sure

– b

ar

Braking Torque Nm

TWIFLEX TWIFLEX

GMX GMX

BRAKE CALIPERBRAKE CALIPERTYPE GMXTYPE GMX

TT WIFLEX WIFLEX

160(6.3)

215 (8.5)

500(19.7)

TWIFLEX

GMX

BRAKE CALIPERTYPE GMX

T WIFLEX

0 100 1000 1500 2000 2500 3000 3500

610 710 810 915900

800

700

600

500

400

300

200

100

0

Disc Diameter mm

Forc

e on

Lev

er –

N

Braking Torque Nm

TWIFLEX TWIFLEX

GMX GMX

BRAKE CALIPERBRAKE CALIPERTYPE GMXTYPE GMX

TT WIFLEX WIFLEX

227 (8.9)160(6.3)

340(13.4)

75(2.9)

TWIFLEX

GMX

BRAKE CALIPERTYPE GMX

T WIFLEX

0 100 200 300 400 500 600 700 800 900 1000

610 710 810 9151800

1600

1400

1200

1000

800

600

400

200

0

Disc Diameter mm

For

ce –

N

Braking Torque Nm

Weight of caliper and lever assembly - 10.62kgWeight of lever assembly only - 1.4kgMaximum Braking Force = 8.3kN @ 0.9kN force on lever

Weight of caliper and hand wheel assembly - 10.52kgWeight of hand wheel assembly only - 1.3kgMaximum Braking Force = 2.68kN

GMX SeriesGMXG Pneumatically Applied – Spring Released

GMXH Mechanically Applied – Lever Operated

GMXW Mechanically Applied – Hand Operated

Retraction pressures where shown are calculated and may vary depending on spring tolerance.

Page 27: Industrial Disc Brakes - BIBUS

25P-1648-TF 11/10 Twiflex +44 (0) 20 8894 1161

A217

683

A217

683

T WIFLEX

TWIFLEX

GMX

225

BRAKE CALIPERTYPE GMX

247102

267

412

79

GMXEA Spring Applied - Electrically Released, Self Adjusting

The EA actuator is a spring applied, electricallyreleased unit designed for use with the Twiflex GMXrange of disc brake calipers. A 175W pancake motordrives a ball screw mechanism, retracting the brake.

A feature of the unit is a patented self-adjustingmechanism which maintains a constant air gap (andconsequently braking force) between pad and discas the pads wear.

The assembly is contained in a rugged, castaluminum housing, designed for service in theharshest environments, which mounts directly to onearm of the GMX caliper.

The GMXEA is supplied complete with a solid statecontroller, suitable for all AC supply voltages, whichconverts the supply to the required DC output for thepancake motor. A 24VDC unit is also available. Thebrake is released when power to the controller isswitched on, and applied when power isdisconnected. Controlled application of the brakeoccurs, electrically damped by using the motor backE.M.F. and a damping resistor.

The controller is housed in a strong, steel, wallmounted enclosure (215mm x 215mm x 150mmdeep), protected to IP44 as standard (higher ratingon request).

Braking force adjustable to 50% of maximum.

GMX Series

Maximum Braking Force = 6kN Weight of caliper and actuator - 17.9kg

Weight actuator only - 8.7kgWeight of controller - 5.5kg

Retraction pressures where shown are calculated and may vary depending on spring tolerance.

Page 28: Industrial Disc Brakes - BIBUS

GMXS Spring Applied – Pneumatically Released, Self Adjusting

26 Twiflex +44 (0) 20 8894 1161 P-1648-TF 11/10

Maximum Braking Force XS 4.6: 6.8kNMinimum Pressure for full retraction: 3 barWeight of caliper and thruster - 13.72kg

Weight of thruster only - 4.5kgVolume displacement of thruster at full retraction = 1.19 l

Maximum Braking Force XS 7.5: 11.2kNMinimum Pressure for full retraction: 5 barWeight of caliper and thruster - 14.12kg

Weight of thruster only - 4.9kgVolume displacement of thruster at full retraction = 1.19 l

Maximum Braking Force XS 9.6: 14.3kNMinimum Pressure for full retraction: 6.5 barWeight of caliper and thruster - 14.32kg

Weight of thruster only - 5.1kgVolume displacement of thruster at full retraction = 1.19 l

TWIFLEX TWIFLEX

GMX GMX

BRAKE CALIPERBRAKE CALIPERTYPE GMXTYPE GMX

TT WIFLEX WIFLEX

ø196(ø 7.7)

A

402(15.8)

TWIFLEX

GMX

BRAKE CALIPERTYPE GMX

T WIFLEX

0 1000 2000 3000 4000 5000 6000

610 710 810 9150

1

2

3

4

5

6

Disc Diameter mm

Air

Pres

sure

– b

ar

Braking Torque Nm (XS 9.6)

0 500 1000 1500 2000 2500 3000

610 710 810 9150

1

2

3

Disc Diameter mm

Air

Pres

sure

– b

ar

Braking Torque Nm (XS 4.6)

0 500 1000 1500 2000 2500 3000 3500 4000 4500

610 710 810 9150

1

2

3

4

5

Disc Diameter mm

Air

Pres

sure

– b

ar

Braking Torque Nm (XS 7.5)

TWIFLEX TWIFLEX

GMX GMX

BRAKE CALIPERBRAKE CALIPERTYPE GMXTYPE GMX

TT WIFLEX WIFLEX

374(14.7)

160(6.3)A

TWIFLEX

GMX

BRAKE CALIPERTYPE GMX

T WIFLEX

0 1000 2000 3000 4000 5000 6000

610 710 810 9150

10

20

30

40

50

60

70

Disc Diameter mm

Oil P

ress

ure

– ba

r

Braking Torque Nm (XSH 9.6)

0 500 1000 1500 2000 2500 3000

610 710 810 9150

5

10

15

20

25

30

35

Disc Diameter mm

Oil P

ress

ure

– ba

r

0

Braking Torque Nm (XSH 4.6)

0 500 1000 1500 2000 2500 3000 3500 4000 4500

610 710 810 9150

10

20

30

40

50

60

Disc Diameter mm

Oil P

ress

ure

– ba

r

Braking Torque Nm (XSH 7.5)

Maximum Braking Force XSH 9.6: 14.3kNMinimum Pressure for full retraction: 82 barWeight of caliper and thruster - 13.82kg

Weight of thruster only - 4.6kgVolume displacement of thruster at 6mmretraction = 9.1ml

Maximum Braking Force XSH 4.6: 6.8kNMinimum Pressure for full retraction: 40 barWeight of caliper and thruster - 13.22kg

Weight of thruster only - 4kgVolume displacement of thruster at 6mm retraction = 9.1ml

Maximum Braking Force XSH 7.5: 11.2kNMinimum Pressure for full retraction: 63 barWeight of caliper and thruster - 13.62kg

Weight of thruster only - 4.4kgVolume displacement of thruster at 6mm retraction = 9.1ml

GMX Series

GMXSH Spring Applied – Hydraulically Released, Self Adjusting

Retraction pressures where shown are calculated and may vary depending on spring tolerance.

AXSH 9.6 330XSH 7.5 305XSH 4.6 305

AXS 9.6 296.5 XS 7.5 285.5XS 4.6 285.5

Page 29: Industrial Disc Brakes - BIBUS

GMR Disc Brake Caliper

27P-1648-TF 11/10 Twiflex +44 (0) 20 8894 1161

44(1.7)

C

A

3 holes ø 0.67

40 (1.58)to disc edge

(M16-148 lb.ft.)

170 (6.7)

170(6.7)

300 (11.8)B

The Twiflex GMR and GMR40 series of disc brake calipers issuitable for use with discs of 25.4mm, and 40mm thickrespectively. Minimum disc diameter is 610mm.

Normally one or two calipers are used per disc, but the numbermay be increased depending on disc size. The brakes may bepositioned at any angle around the periphery of the disc, butshould ideally be mounted horizontally (i.e. at the 3 o’clock or 9o’clock position). If the caliper mounting angle is greater than10° from the horizontal, or on vertical shaft applications, itshould be fitted with an inclined mounting kit. A range of brakediscs is available from Twiflex (see Disc and Hub Assemblies).

For pneumatic operation use dry, filtered and non-lubricatedcompressed air. Pneumatic brakes require a control valve,operated either manually or by pneumatic or electrical signal.

The ratings shown on the graphs are based on fully bedded inand conditioned brake pads with a nominal friction coefficient μ = 0.4. Twiflex disc brakes must be used with Twiflex asbestosfree brake pads.

Effective disc radius = actual radius (m) – 0.06m.

GMR Series

Maximum Pressure 7 barMaximum Braking Force = 36kN @ 7 barWeight of caliper and thruster - 40.8kgWeight of thruster only - 6.8kgVolume displacement of thruster at full stroke = 1.8 l

GMR PGMR40 P 223

212A B

306312

300

B

A

467

++ ++

610 760 915 1220 1370 1525 18307

6

5

4

3

2

1

0

Disc Diameter mm

Air

Pres

sure

– b

ar

0 5 10 15 20 25 30

Braking Torque kNm

++ ++

300

381

B

A

610 760 915 1220 1370 1525 1830140

120

100

80

60

40

20

0

Disc Diameter mm

Oil P

ress

ure

– ba

r

0 5 10 15 20 25 30

Braking Torque kNmMaximum Pressure 140 barMaximum Braking Force = 36kN @ 140 barWeight of caliper and thruster - 36.9kgWeight of thruster only - 2.9kgVolume displacement of thruster at full stroke = 40ml

GMRP Pneumatically Applied – Spring Released

GMRH Hyraulically Applied – Spring Released

Retraction pressures where shown are calculated and may vary depending on spring tolerance.

A B CGMR25 25 212 24GMR40 40 223 29

A BGMRP 212 306

GMR40P 223 312

A BGMRH 212 332

GMR40H 223 343

Page 30: Industrial Disc Brakes - BIBUS

28 Twiflex +44 (0) 20 8894 1161 P-1648-TF 11/10

Maximum Braking Force S 12.9: 30kNMinimum Pressure for full retraction: 7 barWeight of caliper and thruster - 48kgWeight of thruster only - 14kgVolume displacement of thruster at full retraction = 1.3 l

Maximum Braking Force S 11: 25kNMinimum Pressure for full retraction: 6 barWeight of caliper and thruster - 47.2kgWeight of thruster only - 13.2kgVolume displacement of thruster at full retraction = 1.3 l

Maximum Braking Force S 8.4: 19.5kNMinimum Pressure for full retraction: 4.8 barWeight of caliper and thruster - 46.2kgWeight of thruster only - 12.2kgVolume displacement of thruster at full retraction = 1.3 l

Maximum Braking Force S 15.6: 36kNMinimum Pressure for full retraction: 8.4 barWeight of caliper and thruster - 49kgWeight of thruster only - 15kgVolume displacement of thruster at full retraction = 1.3 l

++++

A

B

465

300

610 760 915 1220 1370 1525 1830Disc Diameter mm

Air

Pres

sure

– b

ar

0 4 8 12 16 20 24 28 32

0

2

4

6

8

Braking Torque kNm (S 15.6)

610 760 915 1220 1370 1525 1830Disc Diameter mm

Air

Pres

sure

– b

ar

0 5 10 15 20 25

0

1

2

3

4

5

6

Braking Torque kNm (S 12.9)

610 760 915 1220 1370 1525 1830Disc Diameter mm

Air

Pres

sure

– b

ar

0 2 4 6 8 10 12 14 16 18 20 22

0

1

2

3

4

5

Braking Torque kNm (S 11)

610 760 915 1220 1370 1525 1830Disc Diameter mm

Air

Pres

sure

– b

ar

0 2 4 6 8 10 12 14 16 18

0

1

2

3

4

Braking Torque kNm (S 8.4)

GMRSD Spring Applied – Pneumatically Released

GMR Series

Maximum Braking Force SD 12.9: 30kNMinimum Pressure for full retraction: 3.8 barWeight of caliper and thruster - 54kgWeight of thruster only - 20kgVolume displacement of thruster at full retraction = 2.5 l

Maximum Braking Force SD 11: 25kNMinimum Pressure for full retraction: 3.3 barWeight of caliper and thruster - 53.2kgWeight of thruster only - 19.2kgVolume displacement of thruster at full retraction = 2.5 l

Maximum Braking Force SD 8.4: 19.5kNMinimum Pressure for full retraction: 2.4 barWeight of caliper and thruster - 52.2kgWeight of thruster only - 18.2kgVolume displacement of thruster at full retraction = 2.5 l

Maximum Braking Force SD 15.6: 36kNMinimum Pressure for full retraction: 4.6 barWeight of caliper and thruster - 55kgWeight of thruster only - 21kgVolume displacement of thruster at full retraction = 2.5 l

300

B

A

470

++ ++

610 760 915 1220 1370 1525 1830Disc Diameter mm

Air

Pres

sure

– b

ar

0 5 10 15 20 25

0

1

2

3

Braking Torque kNm (SD 12.9)

610 760 915 1220 1370 1525 1830Disc Diameter mm

Air

Pres

sure

– b

ar

0 2 4 6 8 10 12 14 16 18 20 22

0

0.5

1

1.5

2

2.5

Braking Torque kNm (SD 11)

GMRS Spring Applied – Pneumatically Released

Retraction pressures where shown are calculated and may vary depending on spring tolerance.

A BGMRS 212 376

GMR40S 223 382

A BGMRSD 212 451

GMR40SD 223 457

610 760 915 1065 1220 1370 1525 1830Disc Diameter mm

Air

Pres

sure

– b

ar

0 3000 6000 9000 12000 15000 18000

Braking Torque Nm (SD 8.4)

0

0.5

1

1.5

2

610 760 915 1065 1220 1370 1525 1830Disc Diameter mm

Air

Pres

sure

– b

ar

0 4000 8000 12000 16000 20000 24000 28000 32000

0

1

2

3

4

Braking Torque Nm (SD 15.6)

Page 31: Industrial Disc Brakes - BIBUS

GMRSH Spring Applied – Hydraulically Released

29P-1648-TF 11/10 Twiflex +44 (0) 20 8894 1161

++ ++

300

B

A

434

610 760 915 1065 1220 1370 1525 18300

20

40

60

80

100

Disc Diameter mm

Oil P

ress

ure

– ba

r

0 5 10 15 20 25 30

Braking Torque kNm (SH 15)

610 760 915 1065 1220 1370 1525 18300

20

40

60

80

Disc Diameter mm

Oil P

ress

ure

– ba

r

0 2 4 6 8 10 12 14 16 18 20 22

Braking Torque kNm (SH 11)

610 760 915 1065 1220 1370 1525 1830

0

10

20

30

40

50

Disc Diameter mm

Oil P

ress

ure

– ba

r

0 2 4 6 8 10 12 14

Braking Torque kNm (SH 7)

610 760 915 1065 1220 1370 1525 1830

0

5

10

15

20

Disc Diameter mm

Oil P

ress

ure

– ba

r

0 1 2 3 4 5

Braking Torque kNm (SH 2.5)

610 760 915 1065 1220 1370 1525 18300

20

40

60

80

100

Disc Diameter mm

Oil P

ress

ure

– ba

r

0 5 10 15 20 25

Braking Torque kNm (SH 12.9)

610 760 915 1065 1220 1370 1525 18300

10

20

30

40

50

60

Disc Diameter mm

Oil P

ress

ure

– ba

r

0 2 4 6 8 10 12 14 16 18 20

Braking Torque kNm (SH 8.4)

610 760 915 1065 1220 1370 1525 18300

10

20

30

Disc Diameter mm

Oil P

ress

ure

– ba

r

0 2 4 6 8 10

Braking Torque kNm (SH 4.5)

Maximum Braking Force SH 15: 35kNMinimum Pressure for full retraction: 120 barWeight of caliper and thruster - 53kgWeight of thruster only - 19kgVolume displacement of thruster at full retraction = 56ml

Maximum Braking Force SH 11: 25kNMinimum Pressure for full retraction: 92 barWeight of caliper and thruster - 51.2kgWeight of thruster only - 17.2kgVolume displacement of thruster at full retraction = 56ml

Maximum Braking Force SH 7: 16.5kNMinimum Pressure for full retraction: 59 barWeight of caliper and thruster - 49.7kgWeight of thruster only - 15.7kgVolume displacement of thruster at full retraction = 56ml

Maximum Braking Force SH 2.5: 6kNMinimum Pressure for full retraction: 21 barWeight of caliper and thruster - 47.9kgWeight of thruster only - 13.9kgVolume displacement of thruster at full retraction = 56ml

Maximum Braking Force SH 12.9: 30kNMinimum Pressure for full retraction: 100 barWeight of caliper and thruster - 52kgWeight of thruster only - 18kgVolume displacement of thruster at full retraction = 56ml

Maximum Braking Force SH 8.4: 19.5kNMinimum Pressure for full retraction: 65 barWeight of caliper and thruster - 50.2kgWeight of thruster only - 16.2kgVolume displacement of thruster at full retraction = 56ml

Maximum Braking Force SH 4.5: 10.5kNMinimum Pressure for full retraction: 38 barWeight of caliper and thruster - 48.7kgWeight of thruster only - 14.7kgVolume displacement of thruster at full retraction = 56ml

GMR Series

Retraction pressures where shown are calculated and may vary depending on spring tolerance.

A BGMRSH 212 380

GMR40SH 223 387

Page 32: Industrial Disc Brakes - BIBUS

T20 Hydraulically Applied

30 Twiflex +44 (0) 20 8894 1161 P-1648-TF 11/10

Modular Series

Maximum Pressure 20 barMaximum Braking Force = 2kN @ 20 bar oil or air pressureWeight of caliper - 0.75kgVolume displacement per 1mm stroke = 3ml

66(2.6)

2.0(0.08)

10 (0.4)to disc edge

2 holes ø8.5 (ø.33)M8-23 Nm

(M8-17 lb.ft.)

Mounting plate the same as disc thickness

1 hole ø11 (ø.43)

50.8(2.0)34

(1.34)

31.8(1.25)

31.8(1.25)

150 200 250 300 350 400 460 515 610Disc Diameter mm

Air/

Oil P

ress

ure

– ba

r

0 50 100 150 200 250 300 350 400 450 500 550

20

15

10

5

0

Braking Torque Nm

The Twiflex T2 disc brake caliper is split caliper design suitable for usewith a minimum disc thickness of 5mm. The modules are mountedeach side of a central mounting plate of the same thickness as thebrake disc. Minimum disc diameter is 120mm. Alternatively, the brakemay be side-mounted with a spacer equal to the disc thicknessbetween the two halves.

For pneumatic operation, use dry and filtered compressed air.Pneumatic brakes require a control valve, operated either manually orby pneumatic or electrical signal.

Normally one or two calipers are used per disc, but the number maybe increased depending on disc size. The brakes may be positioned at

any angle around the periphery of the disc, but should ideally bemounted horizontally (i.e. at the 3 o’clock or 9 o’clock position). Arange of brake discs is available from Twiflex (see Disc and HubAssemblies).

The ratings shown on the graph are based on fully bedded in andconditioned brake pads with a nominal friction coefficient μ = 0.4.Twiflex disc brakes must be used with Twiflex asbestos free brakepads.

Effective disc radius = actual radius (m) – 0.019m.

Maximum Pressure 110 barMaximum Braking Force = 20kN @ 110 barWeight of caliper - 5.82kgVolume displacement per 1mm stroke at each pad = 4.8ml

112(4.4)

74(2.9)

134 (5.3)

108 (4.25) 80 (3.1)

128 (5.0)

21 (0.83)to disc edge

Clearance forpad removal

2 holesø13

(m12 87 Nm)

300 350 400 460 515 610 710 810 910

100

80

60

40

20

0

Disc Diameter mm

Oil P

ress

ure

– ba

r

0 1 2 3 4 5 6 7 8 9

Braking Torque kNm

The standard Twiflex T20 disc brake caliper is split caliper designsuitable for use with a minimum disc thickness of 12.7mm. Optionally,the caliper may be supplied in a modified form for use with a minimumdisc thickness of 8mm. Normally the brake is side mounted, however,for use with a disc thickness greater than 20mm, the split designallows the modules to be mounted each side of a central mountingplate of the same thickness as the brake disc. Minimum disc diameteris 300mm.

Normally one or two calipers are used per disc, but the number maybe increased depending on disc size. The brakes may be positionedat any angle around the periphery of the disc. A range of brake discsis available from Twiflex (see Disc and Hub Assemblies).

The ratings shown on the graph are based on fully bedded in andconditioned brake pads with a nominal friction coefficient μ = 0.4.Twiflex disc brakes must be used with Twiflex asbestos free brakepads. Effective disc radius = actual radius (m) – 0.032m.

T2 Pneumatically or Hydraulically Applied

Retraction pressures where shown are calculated and may vary depending on spring tolerance.

Page 33: Industrial Disc Brakes - BIBUS

31P-1648-TF 11/10 Twiflex +44 (0) 20 8894 1161

Modular Series

I WI F L EX

I40

175 (6.9)

185 (7.3)

134 (5.3)

180 (7.0)

167 (6.6)

105 (4.1)Pad Removal

24 (0.95) To disc edge

2 Holes Ø25(M24 675Nm)

610 760 915 1065 1220 1370 1525 1830100

80

60

40

20

0

Disc Diameter mm

Oil P

ress

ure

– ba

r

0 5 10 15 20 25 30 35 40

Braking Torque kNm

Maximum Pressure 100 barMaximum Braking Force = 45kN @ 100 barWeight of caliper - 18.6kgVolume displacement per 1mm stroke at each pad = 15ml

T40 Hydraulically Applied

The Twiflex T40 disc brake caliper is split caliper design suitable foruse with a minimum disc thickness of 20mm. The modules aremounted each side of a central mounting plate of the same thicknessas the brake disc. Minimum disc diameter is 300mm.

Normally one or two calipers are used per disc, but the number maybe increased depending on disc size. The brakes may be positioned

at any angle around the periphery of the disc. A range of brake discsis available from Twiflex (see Disc and Hub Assemblies).

The ratings shown on the graph are based on fully bedded in andconditioned brake pads with a nominal friction coefficient μ = 0.4.Twiflex disc brakes must be used with Twiflex asbestos free brakepads. Effective disc radius = actual radius (m) – 0.045m.

Retraction pressures where shown are calculated and may vary depending on spring tolerance.

Page 34: Industrial Disc Brakes - BIBUS

32 Twiflex +44 (0) 20 8894 1161 P-1648-TF 11/10

VCSMk4 Spring Applied – Hydraulically Released

Weight of caliper (2 modules) - 50kgVolume displacement per 1mm stroke at both pads = 21ml

426 + Disc Thickness

182 (7.17)

144 (5.67)104 (4.10)

DiscThickness 1/4 BSPP Inlet Port1/4 BSPP

Drain Ports 213 (8.39)

66(2.6)

85(3.35)

62(2.4) M24 Hex

Head Bolts Grade 8.8

Adjustment for Pad Wear

M16 Hex Head Bolts Grade 8.8

Mounting Plate thickness tobe the same as disc thickness

108 (4.25)

The Twiflex VCS Mk4 disc brake caliper is comprised of twohalves, or spring modules, and is suitable for use with aminimum disc thickness of 20mm. The modules are mountedeach side of a central mounting plate of the same thickness asthe brake disc. Minimum disc diameter is 500mm.

Normally one or two calipers are used per disc, but thenumber may be increased depending on disc size. The brakesmay be positioned at any angle around the periphery of thedisc, but should ideally be mounted horizontally (i.e. at the 3o’clock or 9 o’clock position). A range of brake discs isavailable from Twiflex (see Disc and Hub Assemblies).

Braking force ratings are achieved through a combination ofshim number and air gap setting. Spring fatigue life is afunction of the caliper rating.

The ratings shown in the table are based on fully bedded inand conditioned brake pads with a nominal friction coefficientμ = 0.4. Twiflex disc brakes must be used with Twiflexasbestos free brake pads.

Effective disc radius = actual radius (m) – 0.064m.

Modular Series

Disc/Pad Braking MinimumCaliper Air Gap Force Pressure for FullType mm kN Retraction bar

VCS70 1.7 62 160VCS60 2.0 53 148VCS50 2.0 44 131VCS40 2.0 35 113VCS30 2.0 25 94

300 (11.8)

144 (5.7)

64 (2.5)

165(6.5)

236(9.3)83 (3.3)

BleedPort 1/4" Port for

Hydraulic Feed

290.5 (11.4)

Mounting Bracket

DiscThickness

The Twiflex VKCS-FL disc brake caliper comprises a singlespring module forming the ‘active’ side of this floating unit andis available for use where space is limited or to accommodateaxial disc float of ±6mm.

Braking force ratings are achieved through a combination ofshim number and air gap setting. Spring fatigue life is afunction of the caliper rating.

The ratings shown in the table are based on fully bedded inand conditioned brake pads with a nominal friction coefficientμ = 0.4. Twiflex disc brakes must be used with Twiflexasbestos free brake pads.

Effective disc radius = actual radius (m) – 0.064m.

Retraction pressures where shown are calculated and may vary depending on spring tolerance.

VCS-FL Spring Applied – Hydraulically Released

Page 35: Industrial Disc Brakes - BIBUS

33P-1648-TF 11/10 Twiflex +44 (0) 20 8894 1161

VKSD Spring Applied – Hydraulically Released

Modular Series

Disc/Pad Braking MinimumCaliper Air Gap Force Pressure for FullType mm kN Retraction bar

VKSD119 2 119 138VKSD112 2 112 131VKSD104 2 104 124VKSD96 2 96 116VKSD88 2 88 108VKSD80 2 80 100VKSD71 2 71 92VKSD62 2 62 83VKSD58 2 58 63VKSD53 2 53 58VKSD47 2 47 53VKSD41 2 41 47VKSD34 2 34 41VKSD28 2 28 34

Weight of caliper (2 modules) - 146kgVolume displacement per 1mm stroke at both pads = 28ml

CAD No 107CAD No 107DRG No A01253DRG No A01253

CAD No 105CAD No 105DRG No A01225DRG No A01225

CAD No 101CAD No 101DRG No A01165DRG No A01165

CAD No 101CAD No 101DRG No A01165DRG No A01165

CAD No 105CAD No 105DRG No A01225DRG No A01225

CAD No 107CAD No 107DRG No A01253DRG No A01253

343(13.5)

251(9.9)

345(13.6)

323(12.7)

Clearance for padremoval either side

The Twiflex VKSD disc brake caliper is comprised of two halves, orspring modules, and is suitable for use with a minimum disc thickness of20mm. The modules are mounted each side of a central mounting plate12mm thicker than the brake disc. Minimum disc diameter is 1000mm.

Normally one or two calipers are used per disc, but the number may beincreased depending on disc size. The brakes may be positioned at anyangle around the periphery of the disc, but should ideally be mountedhorizontally (i.e. at the 3 o’clock or 9 o’clock position). A range of brakediscs is available from Twiflex (see Disc and Hub Assemblies).

Braking force ratings are achieved through a combination of differentsprings, shims and air gap settings. Spring fatigue life is a function of thecaliper rating.

The ratings shown in the table are based on fully bedded in andconditioned brake pads with a nominal friction coefficient μ = 0.4.Twiflex disc brakes must be used with Twiflex asbestos free brake pads.

Effective disc radius = actual radius (m) – 0.095m.

409(16.1)

386(15.2)

328(12.9)

86(3.4)

The Twiflex VKSD-FL disc brake caliper comprises a singlespring module forming the ‘active’ side of this floating unitand is available for use where space is limited or toaccommodate axial disc float of ±6mm.

Braking force ratings are achieved through a combination ofdifferent springs, shims and air gap settings. Spring fatiguelife is a function of the caliper rating.

The ratings shown in the table are based on fully bedded inand conditioned brake pads with a nominal friction coefficientμ = 0.4. Twiflex disc brakes must be used with Twiflexasbestos free brake pads.

Effective disc radius = actual radius (m) – 0.095m.

VKSD-FL Spring Applied – Hydraulically Released

Retraction pressures where shown are calculated and may vary depending on spring tolerance.

Page 36: Industrial Disc Brakes - BIBUS

34 Twiflex +44 (0) 20 8894 1161 P-1648-TF 11/10

VKHD Hydraulically Applied – Spring Released

Maximum Pressure 100 barMaximum Braking Force = 118kN @ 100 barWeight of caliper (2 modules) - 80kgVolume displacement per 1mm stroke at both pads = 31ml

344(13.5)

354(13.9)

252(9.9)

209(8.3)

Clearance for pad removal (either side)

600(23.6)

398(15.7)

373(14.7)

85(3.3)

1000 1200 1600 2000 2500Disc Diameter mm

Oil P

ress

ure

– ba

r

0 20 40 60 80 100 120 140

100

80

60

40

20

0

Braking Torque kNm

The Twiflex VKHD disc brake caliper is comprised of twohalves, or hydraulic modules, and is suitable for use with aminimum disc thickness of 20mm. The modules are mountedeach side of a central mounting plate 12mm thicker than thebrake disc. Minimum disc diameter is 1000mm.

Normally one or two calipers are used per disc, but thenumber may be increased depending on disc size. The brakesmay be positioned at any angle around the periphery of thedisc, but should ideally be mounted horizontally (i.e. at the 3

o’clock or 9 o’clock position). A range of brake discs isavailable from Twiflex (see Disc and Hub Assemblies).

The ratings shown on the graph are based on fully bedded inand conditioned brake pads with a nominal friction coefficientμ = 0.4. Twiflex disc brakes must be used with Twiflexasbestos free brake pads.

Effective disc radius = actual radius (m) – 0.095m.

VSMk2 Spring Applied – Hydraulically Released

The Twiflex VS Mk2 disc brake caliper is comprised of twomodules secured between U-shaped top and bottommounting plates by tie rods.

Typically one or two calipers are used per disc, but thenumber may be increased depending on disc size. The brakesmay be positioned at any angle around the periphery, butideally mounted horizontally (at the 3 o’clock or 9 o’clockpositions).

Minimum disc diameter is 1000mm with no maximum exceptfor practical limitations. The standard caliper can

accommodate disc thicknesses from 38mm to 50mm -consult Twiflex for discs thicker than 50mm.

A tandem caliper arrangement is available sharing a common,central, mounting plate; minimum disc diameter is 2000mm

The ratings shown on the tables are based on fully bedded inand conditioned brake pads with a nominal friction coefficientμ = 0.4. Twiflex disc brakes must be used with Twiflexasbestos free brake pads.

Effective disc radius = actual radius (m) – 0.110m.

Note: Spring fatigue life is a function of the caliper rating.

Modular Series

Disc/Pad Braking MinimumCaliper Air Gap Force Pressure for FullType mm kN Retraction bar

VS230 4 185 180VS205 4 165 163VS190 4 153 154VS175 4 141 144VS155 4 125 131VS137 4 111 108VS100 4 81 84

Weight of caliper = 410kg Volume displacement per 1mm stroke at both pads = 32ml

Retraction pressures where shown are calculated and may vary depending on spring tolerance.

Page 37: Industrial Disc Brakes - BIBUS

35P-1648-TF 11/10 Twiflex +44 (0) 20 8894 1161

Maximum Pressure 140 barMaximum Braking Force = 285kN @ 140 barWeight of caliper - 287kgVolume displacement per 1mm stroke at both pads = 51.7ml

WWXXEE

IILLFF HH

VV

500(19.7)

493 (19.4)

373 (14.7)

Clearance forpad removal

WXE

ILF H

V

1200 1600 2000 2500Disc Diameter mm

Oil P

ress

ure

– ba

r

0 50 100 150 200 250 300 350

140

120

100

800

60

40

20

0

Braking Torque kNm

The Twiflex VH disc brake caliper is comprised of twomodules secured between U-shaped top and bottommounting plates by tie rods.

Typically one or two calipers are used per disc, but thenumber may be increased depending on disc size. The brakesmay be positioned at any angle around the periphery, butideally mounted horizontally (at the 3 o’clock or 9 o’clockpositions).

Minimum disc diameter is 1000mm with no maximum exceptfor practical limitations. The standard caliper can

accommodate disc thicknesses from 38mm to 50mm -consult Twiflex for discs thicker than 50mm.

A tandem caliper arrangement is available sharing a common,central, mounting plate; minimum disc diameter is 2000mm

The ratings shown on the graph are based on fully bedded inand conditioned brake pads with a nominal friction coefficientμ = 0.4. Twiflex disc brakes must be used with Twiflexasbestos free brake pads.

Effective disc radius = actual radius (m) – 0.110m.

VH Hydraulically Applied – Spring Released

TWIFL

EX

A011843

329 (12.9) 440 (17.3)

555(22.0)

570(22.4)

Clearance for pad removal each side

A011843

TWIFL

EX

1500 2000 2500 3000Disc Diameter mm

Oil P

ress

ure

– ba

r

0 100 200 300 400 500 600

100

80

60

40

20

0

Braking Torque kNm

The Twiflex VMH2 disc brake caliper is comprised of twomodules bolted to a central mounting plate, 12mm thickerthan the brake disc. Minimum disc thickness is 38mm andminimum disc diameter is 1500mm with no maximum exceptfor practical limitations.

Typically one or two calipers are used per disc, positioned atany angle around the periphery, but the number may beincreased depending on disc size.

The ratings shown on the graph are based on fully bedded inand conditioned brake pads with a nominal friction coefficientμ = 0.4. Twiflex disc brakes must be used with Twiflexasbestos free brake pads.

Effective disc radius = actual radius (m) – 0.155m.

VMH2 Hydraulically Applied – Spring Released

Modular Series

Retraction pressures where shown are calculated and may vary depending on spring tolerance.

Maximum Pressure 110 barMaximum Braking Force = 433kN @ 110 barWeight of caliper ( 2 modules ) - 580kgVolume displacement per 1mm stroke at both pads = 101.5ml

Page 38: Industrial Disc Brakes - BIBUS

VMS3SPS Spring Applied – Hydraulically Released

460(18.1)

155(6.1)

160(6.3)

555(21.9)

440(17.3)

570(22.4)

Space for pad removal

36 Twiflex +44 (0) 20 8894 1161 P-1648-TF 11/10

A011843A011843

TWIFL

EXTW

IFLEX

558(22.0)

440 (17.3)415 (16.3)

570(22.5)

Clearance for pad removal

VMS2 Spring Applied – Hydraulically Released

The Twiflex VMS2 disc brake caliper is comprised of twomodules bolted to a central mounting plate, 12mm thickerthan the brake disc. Minimum disc thickness is 38mm andminimum disc diameter is 1500mm with no maximum exceptfor practical limitations.

Typically one or two calipers are used per disc, positioned atany angle around the periphery, but the number may beincreased depending on disc size.

The braking force is a function of both the air-gap setting andthe thickness of the shim pack used (see table) but may bealso controlled using hydraulic back pressure during braking.

The ratings shown on the tables are based on fully bedded inand conditioned brake pads with a nominal friction coefficientμ = 0.4. Twiflex disc brakes must be used with Twiflexasbestos free brake pads.

Effective disc radius = actual radius (m) – 0.155m.

Disc/Pad Braking HydraulicCaliper Air Gap Force Pressure for FullType mm kN Retraction bar

VMS392 3 392 210VMS356 3 356 197VMS320 3 320 184VMS283 3 283 167VMS245 3 245 154VMS206 3 206 138VMS167 3 167 122

Modular Series

The Twiflex VMS3-SPS disc brake caliper is comprised of two modules bolted toa central mounting plate, 12mm thicker than the brake disc. Minimum discthickness is 38mm and minimum disc diameter is 1500m with no maximumexcept for practical limitations. Based on a development of the earlier TwiflexVMS2-SP disc brake, the VMS3-SPS provides a significant increase in brakingforce but in a similarly sized package.

Infinite fatigue life (>2 x 106 cycles) is achievable for most units at the 3mm airgap shown in the table and possible, by reducing this setting, for the higherrated brakes – contact Twiflex for further information.

The braking force is a function of both the air-gap setting and the thickness ofthe shim pack (if used) but may be also controlled using hydraulic back pressureduring braking.

The ratings shown on the tables are based on fully bedded in and conditionedbrake pads with a nominal friction coefficient μ = 0.4. Twiflex disc brakes mustbe used with Twiflex asbestos free brake pads.

Effective disc radius = actual radius (m) – 0.155m.

Weight of Caliper (2 Modules) = 675kgVolume displacement per 1mm stroke at both pads = 52ml

Weight of Caliper (2 Modules) = 670kgVolume displacement per 1mm stroke at both pads = 77ml

Disc/Pad Braking MinimumCaliper Air Gap Force Pressure for FullType mm kN Retraction bar

VMS3 SPS276 3 276 158VMS3 SPS268 3 268 154VMS3 SPS260 3 260 149VMS3 SPS252 3 252 145VMS3 SPS244 3 244 141VMS3 SPS236 3 236 137VMS3 SPS227 3 227 132VMS3 SPS219 3 219 128VMS3 SPS211 3 211 124VMS3 SPS202 3 202 119VMS3 SPS194 3 194 115VMS3 SPS185 3 185 110VMS3 SPS177 3 177 106VMS3 SPS168 3 168 101VMS3 SPS159 3 159 96VMS3 SPS150 3 150 91VMS3 SPS141 3 141 87

Retraction pressures where shown are calculated and may vary depending on spring tolerance.

Page 39: Industrial Disc Brakes - BIBUS

37P-1648-TF 11/10 Twiflex +44 (0) 20 8894 1161

VMSDP Spring Applied – Hydraulically Released

994(39.1)

835(32.9)

467 (18.4)Fully Retracted

90(3.5)

155(6.1)

143(5.6)

817(32.2)

330(13.0)

Space for pad removal

Similar to the Twiflex VMS2 disc brake, the VMS-DPcomprises 2 spring modules; this time mounted in a commonhousing to form the ‘active’ side of a floating brake caliper.This arrangement allows the assembly to accommodate±10mm of axial disc movement.

Minimum disc diameter is 4500mm with no maximum exceptfor practical limitations. Disc thickness for the standard caliperrange from 117mm to 130mm with the mounting bracketbeing machined accordingly.

The braking force is a function of both the air-gap setting andthe thickness of the shim pack used (see table) but may bealso controlled using hydraulic back pressure during braking.

The VMS-DP is primarily intended to function as a holdingbrake, but may be used for a dynamic duty where spring life isnot a consideration (for example, occasional emergencystopping).

The ratings shown in the table are based on fully bedded inand conditioned brake pads with a nominal friction coefficientμ = 0.4. Twiflex disc brakes must be used with Twiflexasbestos free brake pads.

Effective disc radius = actual radius (m) – 0.155m.

Braking Minimum SpringShim Force Pressure for Full LifePack kN Retraction bar Cycles

0 590 169 >1000001 639 181 >1000002 688 192 >200003 737 204 >20000

Modular Series

Weight of caliper = 1887KgVolume displacement per 2mm stroke = 174ml

Retraction pressures where shown are calculated and may vary depending on spring tolerance.

Page 40: Industrial Disc Brakes - BIBUS

38 Twiflex +44 (0) 20 8894 1161 P-1648-TF 11/10

Brake Discs

B D A

C

A B*

C

Hubs

Twiflex brake discs may be supplied bored anddrilled to customer requirements. Non-standarddisc sizes, not shown in the tables, can besupplied to order. Brake discs are manufacturedfrom spheroidal graphite iron.

Max.Nominal A B C D Inertia Weight Safe DiscDiameter Min. kgm2 kg Speed

250 250 128 36 30 0.04 4.0 6500300 305 166 41 51 0.09 7.3 6000350 356 210 54 76 0.17 10.9 5100400 406 260 54 102 0.28 14.1 4400460 457 311 54 102 0.48 19.1 3900515 514 368 54 102 0.75 22.7 3500610 610 464 54 102 1.57 33.0 2900710 711 565 54 102 3.20 52.3 2500810 813 660 54 102 6.57 85.5 2200915 914 762 54 102 10.80 110.9 1900

12.7mm thick brake discs

25.4mm thick brake discs

All dimensions in mm

Max.Nominal A B C D Inertia Weight Safe DiscDiameter Min. kgm2 kg Speed

610 610 343 76 125 2.75 66 2900760 762 495 76 125 7.0 104 2300915 914 648 76 230 16.0 150 1900

1065 1067 800 76 230 29.1 220 16001220 1219 914 76 230 49.1 273 14001370 1372 1067 76 * 80.1 346 12001525 1524 1219 76 * 120.5 393 11001830 1829 1524 76 * 243.5 522 1000

All dimensions in mm* Bores cast and machined to order

Range of Hubs used with Twiflex Brake DiscsMax. Brake

Hub A B* C Disc Torque WR2

Size Size (kNm) (kgm2)

112 99 14-42 58 250 1.1 0.00097168 146 28-65 87 300 3.6 0.0088240 200 60-95 117 400 9.5 0.044330 272 75-130 155 400 24.0 0.23370 308 90-150 176 501 30.0 0.35

* Hubs can be supplied with parallel or taper bores, and keywayed to order, at extra cost.Hubs are manufactured from steel 080M40.

Disc and Hub Assemblies

Page 41: Industrial Disc Brakes - BIBUS

39P-1648-TF 11/10 Twiflex +44 (0) 20 8894 1161

Monitoring Units

Materials, Traceability & Finishes

Twiflex offers a wide range of monitoring options for bothcaliper and modular brake types. This includes a number ofIP67-rated inductive and analogue proximity sensors for brakestatus or pad condition.

In addition, electro-mechanical and limit switches are availableas single or multi-function units and may be supplied fullysealed, with positive action safety switches.

Monitoring units are used to indicate:

• Brake on or off, or the fully retracted condition reached

• Adjustment for pad wear required

• Pad replacement needed

• Any combination of the above

Twiflex Ltd. is approved to BS EN ISO 9001:2000, by LloydsRegistry of Quality Assurance. The scope of Twiflex Ltd QualitySystem embraces all procedures and controls from quotationto delivery of industrial disc brakes.

Materials

All materials are obtained from Twiflex approved suppliers.Twiflex discs and brake housings, unless otherwise stated, aremade from Spheroidal Graphite Iron and actuator housingsfrom cast aluminium.

Traceability

We can offer, at customer’s request, component traceabilitythrough Lloyds. In special circumstances we can also offertraceability through the American Bureau of Shipping (ABS),Det. Norske Veritas (DNV), and other recognized authorities.

Finishes

Twiflex can offer a range of finishing processes, dependingupon the degree of protection required. Disc brake assembliesrequiring full environmental protection are built using stainlesssteel, hard chrome plating and marine paint.

Page 42: Industrial Disc Brakes - BIBUS

40 Twiflex +44 (0) 20 8894 1161 P-1648-TF 11/10

Hydraulic Power UnitsTwiflex has consolidated decades of development toproduce a range of electro-hydraulic power units to meetmost application requirements. Each power unit has beendesigned for reliability, high performance and lowmaintenance, and is supplied with a comprehensive

easy-to-read installation, operation and maintenance manual.The Twiflex datasheets contain user guides giving a step-by-step selection process. Contact Twiflex applicationengineers to discuss your requirements in detail.

The "LC" range of stand alone power units is designed tooperate the Twiflex range MR, MX, GMX, GMR and VCSspring applied hydraulically released brakes, providing abasic brake on/off control. There are various optionsavailable including "soft braking", a range of operating andmotor voltages, and various add-on accessories including aterminal box.

The "soft braking" option is available as an additionalmanifold slice to facilitate a fast approach, soft brakingsystem. This enables rapid closing of the pad/disc air gapfollowed by controlled application of braking force up to fulltorque. Refer to data sheet DS3001.

The modular “MP” range ofelectro-hydraulic powerpacks has been designedto provide a completelyflexible means of brakecontrol in the most arduousoperating environments.

The units are composed ofone of three base modules,dictated by the size andnumber of calipers to becontrolled, comprisingmotor, pump and reservoir.

The hydraulic circuit is then selected, based on the operationand control logic required by the application and may rangefrom a simple ‘on/off’ function to full closed loop PLCcontrol. Finally, auxiliary options are specified (for example,hand pump for manual caliper release; heater for lowambient temperatures; stainless steel components for marineenvironments, etc.).

The “MP” solution is especially useful when the applicationrequires independent control of multiple brake circuits.

Refer to data sheet DS3002 or contact Twiflex for moredetails.

MP Electro Hydraulic Power Units

LC Electro Hydraulic Power Units

Page 43: Industrial Disc Brakes - BIBUS

41P-1648-TF 11/10 Twiflex +44 (0) 20 8894 1161

Braking CalculationsThere are many factors to take into account when determiningwhat type of brake to use on any particular machine. Forexample, what is the function of the brakes? Are there anyexternal loads? Are there any time delays?

The primary consideration should be to answer the question:

“What do you want the brake to do?”

The application will often fall into one of three main types:

• Holding BrakesIn such static applications a suitable factor should always beused to compensate for the possibility of foreign mattercontaminating the disc surface, loss of conditioning of thebrake pad surface, and to provide an appropriate safetymargin, depending on pad material, statutory or otherrequirements.

• Dynamic and Emergency BrakesIn a dynamic application the brake must stop all of themoving parts of the machine. Often this function is asked forin conjunction with the holding requirements as an

emergency braking function. Basic calculations should, inthese cases, include an assessment of operatingtemperature, power dissipation (to ensure that the pads aremaintained in good condition), and expected pad life.

• Tension (Continuous Duty) BrakesThis application arises when the brake is called upon toprovide a continuous torque or tension on material passingthrough the machine, for example on tension reels. Specialconsiderations are required to ensure adequate pad life.

Braking calculations are fundamental to good brake selection.The following calculations are intended only as a guide forthose wishing to make their own selection. For a moredetailed analysis of a proposed braking system, TwiflexApplication Engineers can assist in providing details of allexpected operating characteristics using specialist software.

Clamping Force (Fn) is the force pressing each brake padagainst the disc.

Braking Force (Fb) is the tangential friction force actingbetween the brake pads and disc.

Fb = 2 . μ . Fn

Where: μ is the coefficient of friction between thepad and the disc (a nominal value of 0.4 is assumedfor fully conditioned pads of standard material).

Braking Torque (Tb) is the moment of braking force about thecenter of rotation.

Tb = Fb . re

Where re is the effective disc radius.

Calculated braking torques for the range of Twiflex brake calipers are shown in the brochure for a range ofstandard disc sizes.

Defintion of Braking Terms

Page 44: Industrial Disc Brakes - BIBUS

42 Twiflex +44 (0) 20 8894 1161 P-1648-TF 11/10

It is important, when making calculations, that a consistent set of units is used.

Symbols and unitsωm Maximum disc speed [rad/sec]ω Deceleration during braking [rad/sec2]J Total inertia referred to braked shaft [kgm2]m External load [kg]TB Total braking torque [Nm]TL Load torque (out-of-balance torque) [Nm]

TJ Inertia Torque [Nm]TF Friction torque [Nm]tb Braking time [sec]td Delay time for brake signal [sec]ts Overall stopping time [sec]g Acceleration due to gravity [m/sec2]

Definition of Symbols and Units

The fundamentals of braking calculations are to ensure that:

• There is sufficient torque to stop and hold the machine at rest

• For dynamic stops, the power dissipation is acceptable forthe area of the brake pads being used

• The operating temperature of the brake disc is controlled,to avoid brake fade and reduced performance

The basic data needed to make an initial calculation are anyout-of-balance forces acting on the machine, and the totalinertia of the moving parts of the machine.

The total braking torque is defined as follows:

TB = TJ + TL - TF

Generally the effects of friction can be ignored for aconservative estimate of the required braking torque.

It is important, in all cases of dynamic braking, that theinertia of all of the moving parts is referred to the brakedshaft when calculating TJ (see below).

Basis of Brake Calculation

Basic braking calculations are derived from simplemechanics. Both the effects of out of balance loads and thetorque needed to stop the inertia in the desired way need tobe calculated.

Load torque TL

Where the machine has any out-of-balance load applied the effective out-of-balance torque must be calculated. In the case of a suspended load, for example this is simplygiven by

TL = m . g . r [Nm]

where r is the radius at which the load acts (based on drumdiameter, reel diameter etc.) The brake will need to overcomethis load before it can start to slow down the machine; (it isassumed that the out of balance opposes the action of thebrake). If the load is at rest, the static brake torque willprevent the load from moving. In practice a safety factorshould be used in the case where the brake is called upononly to hold this load and is only infrequently used in adynamic manner. In these cases a service factor of 2 isrecommended to allow for external environmental conditions, i.e. the brake should be rated to give twice this calculated value.

Brake Calculation

Braking Calculations

Page 45: Industrial Disc Brakes - BIBUS

43P-1648-TF 11/10 Twiflex +44 (0) 20 8894 1161

Braking CalculationsWith some types of machines, such as downhill conveyors orescalators, a component of the load acts in the direction ofmotion. In these cases the following equation should be used:

TL = m . g . r . sin ø [Nm]

Where ø is the angle of the motion to the horizontal. In caseswhere the load does not produce a direct torque on thebraked shaft (eg. there is a gearbox between the loaded shaftand the brake) the load torque should be calculatedaccordingly.

In cases of dynamic braking, where the load torque is notconstant, for example on wind turbines where theaerodynamic load varies with the speed of the machine, thenthe equation for TL becomes complex and it is recommendedthat selection should be referred to Twiflex.

Inertia torque TJ (dynamic braking only)

Having overcome the external forces additional braking torqueis required to stop all the moving parts of the machine. Thisadditional torque is calculated as follows:

TJ = J . ω [Nm]

In this equation the deceleration required can readily becalculated from the braking time.

ω = ω / tb

In some special cases more precise calculation of speed andtime may be required.

The moment of inertia of the system (J) should represent allmoving parts. For example, in a hoist calculation allowanceshould be made to include the motor, brake disc, gearbox,winding drum, ropes, load etc. again with a suitable allowancefor any mechanical advantage at various parts of the system.

The effective inertia of the load is given simply as:

J = m . r2 [kgm2]

For the winding drum the following well established formulacan be used for an initial estimate (can also be used for flatdiscs):

J = π ρ I ( D4 - d4 ) / 32 [kgm2]

Where l is the length of the drum,

D is the outside diameter

d is the inside diameter and ρ is the density of the material(7840 kg/m3 for steel)

The inertia of the motor should also be included in thecalculations. These values can be estimated but should ideallybe obtained directly from the manufacturer.

Note: All inertia must be referred to the brake shaft.

For example, if the brake is positioned on the low speed shaftof a machine (gearbox output shaft) then all calculated inertiavalues (motor, couplings, etc.) must be referred to this shaft.

When referring inertia JB from one shaft with speed ωB toanother shaft with speed ωA use:

JA = JB ( ωB / ωA )2

Special requirements

In certain cases there are other direct considerations to beapplied when making braking calculations.

In mine hoists the service factor for holding is defined, as areallowable levels of deceleration, especially when manriding.

For escalators, allowable stopping distances or even rates ofdeceleration may be defined in local standards.

Twiflex is able to offer assistance with calculations in suchspecial cases.

Page 46: Industrial Disc Brakes - BIBUS

44 Twiflex +44 (0) 20 8894 1161 P-1648-TF 11/10

To optimise braking performance there are otherconsiderations which must be taken into account.

Rubbing speed

For high-speed applications a further consideration is thelinear speed at which the disc is passing between the padswhen the brake operates. This is important and is usuallymeasured at the effective radius.

Thus the rubbing speed is given as:

Rubbing speed = ωm . re (m/s)

In general a maximum speed of 30m/s is recommended forstandard brake pad materials. Above this value it is likely thatthe effective coefficient of friction will be reduced leading to areduction in braking performance. For certain applicationswhere the rubbing speed is particularly high (up to 100m/s)special pads manufactured from sintered materials areavailable. Refer to Twiflex for details.

Operating temperatures

During a dynamic application of a brake the energy of themachine will be converted to heat, generated between thepad and the disc. It is the temperature of the disc surfacethat is normally used to assess the brake performance.Failure to take account of the peak temperature can lead toa reduced braking performance due to the onset of brakefade. With standard brake pads a peak temperature of250°C has been found to be acceptable, although in certaincases higher temperatures might be permitted. In the casewhere sintered pads are used peak temperatures in excessof 600°C are possible. The operating temperature alsodetermines pad wear. The higher the temperature, thegreater the wear rate of the pads. These calculations requirea detailed analysis, carried out by the application engineersat Twiflex, using dedicated software.

Power dissipation

In order to provide a consistent controlled performance of abrake it is also important to check the power dissipatedduring a stop. This affects the condition of the brake pads.

To calculate the power dissipation it is necessary to calculatethe total energy absorbed during the stop, estimated asfollows:

Kinetic energy (KE) = J . ωm2 / 2 (Joules)

In the case of external loads further allowance should also bemade for the change in potential energy of the system. Forexample in the case of a hoist this is determined by how farthe load drops during the braking cycle. The mean powerdissipated is therefore given by:

Mean power dissipation = KE / tb (Watts)

This is usually converted to what is termed the MeanSpecific Power Dissipation (kW/cm2) for evaluation of padperformance, i.e. the mean power dissipation is divided bythe pad area.

A value of 0.7kW/cm2 has been shown to be acceptable foremergency stops of around 10 seconds duration, providingthat the pads have been well bedded in and conditioned.Higher values can be used for shorter stopping times.

For tensioning duties the value of the mean specific powerdissipation is more typically around 0.06 kW/cm2. Failure toobserve this basic selection criteria may result in poorbraking performance and limited pad life.

Twiflex application engineers will be only too happy to assistin the selection process to meet your applicationrequirements.

Other Considerations

Braking Calculations

Page 47: Industrial Disc Brakes - BIBUS

45P-1648-TF 11/10 Twiflex +44 (0) 20 8894 1161

Application Data Form

Mail or Fax to:

Twiflex LimitedTechnical Sales Department9 Briar Road, Twickenham,Middlesex. TW2 6RB England

FAX: +44 (0) 20 8755 5601Phone: +44 (0) 20 8894 1161

Date

Company

Address

City County Postcode

Name

Title Phone ( )

Email FAX ( )

Urgent For Review Please Comment Please Reply Please Recycle

Application Description

Type of braking required: (eg: Holding, Dynamic Stopping, Emergency Stopping, Tensioning):

_______________________________________________________________________________________

Service Brake: (Between motor and gearbox):_______________________________________________

Motor Rating: ___________________________________________________________________________

Safety Braking Required? _________________________________________________________________

Brake Torque: ___________________________________________________________________________

Comments Drawing of Application

Page 48: Industrial Disc Brakes - BIBUS

www.twiflex.com

9 Briar Road, TwickenhamMiddlesex, England TW2 6RB+44 (0) 208 894 1161Fax: +44 (0) 20 8755 5601 P-1648-TF 11/10 Printed in USA

Altra Industrial Motion

Asia Pacific Sales Offices

AustraliaUnit 51/9, Hoyle AvenueCastle Hill, NSW 2154+61 2 9894 0133+61 2 9894 0368 (Fax)www.warnerelectric.com.au

China - Hong KongRoom 304A, 3rd FloorJoin-In Hang Sing Centre71-75 Container Port Rd.Kwai Chung, Hong Kong+852 2615 9313+852 2615 9162 (Fax)www.warnerelectric.com.hk

China - ShanghaiShanghai Universal MansionSuite 703, 168 Yuyuan Road,Shanghai 200040+86 21 5169 9255+86 21 6248 5387 (Fax)www.altramotion.com.cn

China - Taiwan3rd Fl., No. 35, Lane 32Kwang-Fu, South Road10562 Taipei+886 2 2577 8156+886 2 2570 6358 (Fax)www.warnerelectric.com.tw

Singapore39 Benoi RoadSingapore 627725+65 6487 4464+65 6487 6674 (Fax)www.warnerelectric.com.sg

Thailand178 Soi Anamai Srinakarin Rd.,Suanluang Bangkok 10250+66 2 322 5527+66 2 320 2380 (Fax)www.warnerelectric.co.th

For more information, or to contact authorized agents in Japan, Korea, India, or elsewhere in Asia Pacific, send an emailto: [email protected]

Electromagnetic Clutches and Brakes

Warner ElectricElectromagnetic Clutches and Brakes

New Hartford, CT - USA1-800-825-6544For application assistance:1-800-825-9050

St Barthelemy d’Anjou, France+33 (0) 2 41 21 24 24

Precision Electric Coils and Electromagnetic Clutches and Brakes

Columbia City, IN - USA1-260-244-6183

Matrix InternationalElectromagnetic Clutches and Brakes, Pressure Operated Clutches and Brakes

Brechin, Scotland+44 (0) 1356 602000New Hartford, CT - USA1-800-825-6544

Inertia DynamicsSpring Set Brakes; Power On andWrap Spring Clutch/Brakes

New Hartford, CT - USA1-800-800-6445

Overrunning Clutches

Formsprag Clutch Overrunning Clutches and Holdbacks

Warren, MI - USA1-800-348-0881– Press #1

For application assistance:1-800-348-0881 – Press #2

Marland ClutchRoller Ramp and Sprag Type Overrunning Clutches and Backstops

Burr Ridge, IL - USA1-800-216-3515

Stieber Clutch Overrunning Clutches and Holdbacks

Heidelberg, Germany+49 (0) 6221 30 47 0

Engineered Couplings

Ameridrives Couplings Mill Spindles, Ameriflex,Ameridisc

Erie, PA - USA1-814-480-5000

Gear Couplings

San Marcos, TX - USA1-800-458-0887

Bibby TransmissionsDisc, Gear, Grid Couplings, Overload Clutches

Dewsbury, England+44 (0) 1924 460801Boksburg, South Africa+27 11 918 4270

TB Wood’sElastomeric Couplings

Chambersburg, PA - USA1-888-829-6637– Press #5

For application assistance:1-888-829-6637 – Press #7

General Purpose Disc Couplings

San Marcos, TX - USA1-888-449-9439

Ameridrives Power TransmissionUniversal Joints, Drive Shafts, Mill Gear Couplings

Green Bay, WI - USA1-920-593-2444

Huco DynatorkPrecision Couplings and Air Motors

Hertford, England+44 (0) 1992 501900Charlotte, NC - USA 1-800-825-6544

Linear Products

Warner LinearLinear Actuators Belvidere, IL - USA1-800-825-6544For application assistance:1-800-825-9050

St Barthelemy d’Anjou, France+33 (0) 2 41 21 24 24

Heavy Duty Clutches and Brakes

Wichita ClutchPneumatic Clutchesand Brakes

Wichita Falls, TX - USA1-800-964-3262Bedford, England+44 (0) 1234 350311

Twiflex LimitedCaliper Brakes and Thrusters

Twickenham, England+44 (0) 20 8894 1161

Industrial ClutchPneumatic and Oil ImmersedClutches and Brakes

Waukesha, WI - USA1-262-547-3357

Gearing

Boston GearEnclosed and Open Gearing, Electrical and Mechanical P.T. Components

Charlotte, NC - USA1-800-825-6544For application assistance:1-800-816-5608

Nuttall Gear andDelroyd Worm GearWorm Gear and Helical Speed Reducers

Niagara Falls, NY - USA1-716-298-4100

Belted Drives and Sheaves

TB Wood’sBelted Drives

Chambersburg, PA - USA1-888-829-6637 – Press #5

For application assistance:1-888-829-6637 – Press #7

Engineered Bearing Assemblies

Kilian ManufacturingEngineered Bearing Assemblies

Syracuse, NY - USA1-315-432-0700

All Customer Service phone numbers shown in bold