VOITH

Geared Variable-Speed Couplings

Voith Turbo

Voith – Our company

Voith is a reliable partner to essential industries.

We set standards worldwide for paper making technology,

power transmission, power plant equipment and for industrial

services. With annual sales of approx. € 3.3 billion,

24,000 employees and 180 locations worldwide Voith is one

of the large family-owned companies in Europe.

Quality, reliability and soundness are key concepts

of our identity.

These are expressed in three words:

Voith – Engineered reliability.

We want to be our customers’ preferred

supplier and business partner

The engine of our strong growth:

innovative power and reliability

Voith engineers have again and again written

new chapters in the history of technology.

Today, Voith holds over 7,000 active patents

worldwide. Approximately 400 new ones are

added every year.

Voith has operated in the black since its founding

on January 1,1867. The dynamic development

and the growth over the last few years confirm

that we have taken the right steps.

We will continue to expand our worldwide

dedication to our markets.

Precise control of maximum powers page 2

How will you benefit? page 3

Geared variable-speed couplings page 4

with modular design

Geared variable-speed couplings page 5

for high-speed driven machines

How to select the right coupling page 6

Product range page 9

for high-speed driven machines

Geared variable-speed couplings page 10

for low-speed driven machines

Geared variable-speed couplings

Voith Turbo is the largest manufacturer of geared variable-speed

couplings worldwide. Over 4,000 drives have been supplied so far

and are operating successfully. Powers up to 60,000 kW and speeds

up to 20,000 rpm are possible. Drives with geared variable-speed

couplings are renowned all over the world for their outstanding

features and customer benefits in a wide range of applications,

i.e. in power plants, in the petrochemical industry, the chemical

industry, the iron and steel industry as well as many others.

Precise controlof maximum powers

Economical operation with excellent

reliability is a priority in modern

power plants. Whether they are

installed in boiler feed pump or fan

drives, in thermal power stations, in

combined cycle power plants or

nuclear power plants, Voith geared

variable-speed couplings meet

these requirements, both in the

feed water and in the cooling water

circuit of the power plant.

Controlling the speed of the driven

machine provides accurate and

energy-saving adaptation of power

to the operating point of the plant.

In pump and compressor drives in

chemical and petrochemical indus-

try, the geared variable-speed

couplings ensure that driven

machines operate more economi-

cally. Voith Turbo has the perfect

geared variable-speed coupling for

virtually all requirements – be it the

smooth acceleration of motor and

driven machine or the precise and

dynamic adaptation of the speed of

driven machine.

Offshore or onshore, in extremely

hot or cold temperatures, on plat-

forms, pipeline stations or in the

desert – Voith geared variable-

speed couplings have been de-

signed and built to withstand

rough and extreme conditions,

year after year, with a minimum

of maintenance and maximum

reliability and availability. Designs

to API specifications are available

also.

How will you benefit?

� Power savings and extension of driven machine lifecompared to throttle control; lower operating costs

� Precise load adaptation of driven machines due to the high control accuracy and fast reaction times

� Reliability > 99.9% (Evaluation based on units in operation)

� Vibration damping� Relieved motor start-up and smooth acceleration

of heavy masses� Robust and compact design� Easy maintenance, low maintenance costs� Long service life

2

3

How will you benefit?

Combined with a robust squirrel-

cage motor, geared variable-speed

couplings have proven themselves

as the preferred choice when com-

peting against alternative drive

systems.

Petrochemical industry

Pipeline pumps

Crude-oil pumps

Injection pumps

Pipeline compressors

Process compressors

Applications:

Power plants

Boiler feed pumps

Boiler fans

Circulating pumps

Coal mills

Chemical industry

Compressors

Fans

Centrifugal pumps

4

The modular geared variable-speed

coupling is a further development of

the proven geared variable-speed

coupling design. The gear stage

and the hydrodynamic variable-

speed coupling are provided in a

range of separate modules but with

a common interface so that they

can be combined to provide the

optimum solution for a particular

driven machine power and speed.

Geared variable-speed couplingswith modular design

The advantages of this design

are obvious:

� Increased technical flexibility

� Optimum adaptation by combining

gearbox and coupling

� Integrated rapid-start device

� Compact design, short delivery

times

� Easy maintenance

Scoop tube with electro-hydraulic actuator andmechanically operatedoil circulation control valve– improved dynamics– increased precision– low auxiliary power– compact design– no electro-mechanical

connecting members.

Type R..KM

Voith geared variable-speedcoupling type R..KM

1 Gear stage2 Hydrodynamic variable

speed coupling3 Scoop tube 4 Scoop tube controller

(VEHS)5 Working oil cooler6 Lube oil cooler7 Main lube oil pump8 Oil circulation control

valve9 Working oil pump

10 Auxiliary lube oil pump11 Duplex filter12 Oil tank

Design and function

Voith geared variable-speed cou-

plings combine mechanical gears

and a hydrodynamic variable-speed

turbo coupling in one common

housing. The oil tank is bolted to the

bottom of the housing. Depending

on the application or the design,

the gear stage is either arranged

on the input or on the output side of

the coupling.

The coupling fill can be varied as

needed during operation by means

of the scoop tube. As a result, the

speed and power transmitted to the

driven machine can be controlled

steplessly.

Oil supply

Both working and lube oil are

supplied from the integrated oil

tank, but have separate circuits.

The oil system can also be used

to supply both the motor and the

driven machine with lube oil.

Design

The design of a geared variable-

speed coupling is essentially

determined by the power and the

speed of the driven machine.

Geared variable-speed couplingsfor high-speed driven machines

5

R 11

1 K63

0R

110 K6

30R

19K.

..MR

18 K

...MR

17K.

..MR

16K.

..MR

15K.

..M

R14

K...M

R12

K...M

R 10

K...M

R 120/119 GS

0,3

1

2

3

45

10

20

30

405060

1 2 3 4 5 6 7 8 9 10 15 2

R 8 K...M

R12

0R

119

R11

8R

117

R 119/118 GS

R 118/117 GS R 110/111 KGS

R 18/19 KGS-14

R 16/17 KGS

600

550

500

450

400Po

wer

[kW

x 1

000]

Speed [rpm x 1000]

R 11

1 K 63

0R

110 K6

30R

19K.

..MR

18K.

..MR

17K.

..MR

16K.

..MR

15K.

..M

R 14

K...M

R12

K...M

R 10

K...M

R 120/119 GS

0,3

1

2

3

45

10

20

30

405060

1 2 3 4 5 6 7 8 9 10 15 2

R 8 K...M

R12

0R

119

R 11

8R

117

R 119/118 GS

R 118/117 GS R 110/111 KGS

R 18/19 KGS-14

R 16/17 KGS

600

550

500

450

400

Pow

er [k

W x

100

0]

Speed [rpm x 1000]

Input speed = 1500 rpm (50 Hz countries)

Input speed = 1800 rpm (60 Hz countries)The power diagrams show the

powers transmitted in relation to

the input and output speed for the

various coupling types and sizes.

How to select the right coupling

7

6

R11

1 K63

0R

110 K6

30R

19K.

..MR

18K.

..MR

17K.

..MR

16K.

..MR

15K.

..M

R 14

K...M

R 12

K...M

R10

K...M

R8 K.

..M

R 115 GS

R 11

3R

114

R 11

5

R 115 GSR 114 GS

0,3

1

2

3

45

10

20

30

405060

1 2 3 4 5 6 7 8 9 10 15 2

R 114 GSR 113 GS

R 110/111 KGS

R 18/19 KGS-14

R 16/17 KGS

R 19 GS...M

R 18 GS...M

R 17 GS...M

R 16 GS...M

R 15 GS...M

550

500/450

400Po

wer

[kW

x 1

000]

Speed [rpm x 1000]

R 11

1 K 63

0R

110 K6

30R

19K.

..MR

18K.

..MR

17K.

..MR

16K.

..MR

15K.

..M

R 14

K...M

R12

K...M

R 10

K...M

R 8 K.

..M

R 115 GS

R 11

3R

114

R 11

5

R 115 GSR 114 GS

0,3

1

2

3

45

10

20

30

405060

1 2 3 4 5 6 7 8 9 10 15 2

R 114 GSR 113 GS

R 110/111 KGS

R 18/19 KGS-14

R 16/17 KGS

R 19 GS...M

R 18 GS...M

R 17 GS...M

R 16 GS...M

R 15 GS...M

550

500/450

400

Pow

er [k

W x

100

0]

Speed [rpm x 1000]

Input speed = 3000 rpm (50 Hz countries)

Input speed = 3600 rpm (60 Hz countries)Design to API standard are also

available. The size of the machine

then depends on the specified API

service factor.

IV

I

II

III

100

125

75

50

0

25

0%

10%

20%

30%

40% 50% 60% 70% 80%

1

2

3

4

MK

[%]

50 100

output speed [% of input speed]

100%

Smin

Performance diagramThe performance diagram shows

the transmittable coupling torques

MK at different scoop tube positions

as a function of the output speed.

The desired output speed becomes

a stable intersection between cou-

pling torque MK and load torque

(load curve).

How to operate the coupling

Operating Ranges

I, IV Starting RangeII Control RangeIII Overload Range

The shape of the coupling charac-teristic curves is given for informa-tion only, since there may be minordeviations if coupling sizes, circula-tion oil flows, oil viscosity, etc. vary.

Typical load characteristics

1 constant torque (e.g. positive displacementpumps and compressors).

2 decreasing torque (e.g. boiler feed pumps operating at varying pressures).

3 parabolic torque (e.g. resistance parabolae, pumps with back pressure,blowers).

4 decreasing torque (e.g. boiler feed pumps operating at fixed pressure).

Parameters

Scoop tube position in % of the fullscoop-tube stroke.

MK Transmitted coupling torque

Smin Minimum slip required for torque transmission

S = (1 - ) • 100 [%]

n1 = input speed

n2 = output speed

n2n1

8

9

Coupling types for specific applications depend on the respective

arrangement of gearbox and coupling and the power and the speed

of the motor and the driven machine.

Type R..KM

A combination of step-up gear and

variable speed coupling with high

power density, step-up gearing.

Special advantages due to modular

design.

Type R..KGS

A step-up gear is integrated both

at the input and the output side for

particularly high output speeds,

e.g. for high-speed compressors.

Type R..GS

The coupling is direct-driven by the

motor and adapted to the required

speed of driven machine by the

step-up gear located at the output

side of the coupling; ideal for high

powers and extremely high speeds.

Type R..KGS

Type R..GS

Product range for high-speed driven machines

Design and function

For low-speed driven machines, the

turbo coupling is fitted with a reduc-

tion gear on the output. Coupling

and gear stage are situated in a

common housing, the lower part

of which serves as an oil tank.

By adding a Voith hydrodynamic

brake (optional), with an appropri-

ate breaking torque characteristic,

heavy masses of the driven ma-

chine can be rapidly decelerated.

Oil supply

Both working and lube oil are sup-

plied from the integrated oil tank.

The oil system can also be used

to supply both the motor and the

driven machine with oil.

Geared variable-speed couplings for low-speed driven machines

1 Gear stage2 Hydrodynamic variable

speed coupling3 Scoop tube (adjustable)4 Hydrodynamic brake

(optional)5 Oil supply6 Working oil cooler7 Duplex filter8 Oil pump

6

5

3

1

2

4

7

8

Type R..A

Voith geared variable-speedcoupling type R..A

Type R..B

Type R..A

The variable-speed coupling is

fitted with a helical reduction gear

on the output side. Typical driven

machines are coal mills, crushers,

low-speed pumps and fans.

Type R..B

This type of turbo coupling is fitted

with a bevel gear on the output

side. Geared variable-speed cou-

plings for low-speed driven

machines with high inertia, e.g. coal

mills.

Type R..KGL

A step gear at the input side and

a reduction gear at the output side

make this type into a fast reacting

and compact coupling used e.g. for

fast respones times, loading pumps

and high powers.

10

11

Geared variable-speed coupling type R..B

Type R..KGL

The control requirements of low-speed driven machines such

as coal mills, I.D. fans or crude oil pumps, vary greatly.

Depending on the application and for optimum adaptation to

the existing space conditions, the gear stage is designed as

a helical gear or bevel gear.

Voith Turbo GmbH & Co. KG

Variable speed drives

Voithstraße 1

74564 Crailsheim/Germany

Tel. +49 7951 32-0

Fax +49 7951 32-650

[email protected]

www.variable-speed.com

www.voithturbo.com

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