PLAIN BEARING TECHNOLOGY · PDF fileHYDROSTATIC BEARING SYSTEMS OIL TANK PRESSURE PUMP h 0 CONTROL LINE THROTTLE POCKET ... 4 Drilling rod guide Bearing ... with integrated linear

PLAIN BEARING TECHNOLOGY

HYDROSTATICBEARING SYSTEMS

HYDROSTATIC BEARING SYSTEMS

• Hydrostatic throttle systems 3

• ZOLLERN bearing clearance compensator 4

• Compound bearing materials 5

• Hydrostatic spindle units 6

• Hydrostatic guideways 8

• Hydrostatic bearing components 9

• Hydrostatic test bearings 10

• Hydrostatic lead screws 11

• Additional equipment 12

• Enquiry forms 14/16

The ZOLLERN Group

ZOLLERN GmbH & Co. KG is a company with world wideoperations, employing over 3000 employees in the busi-ness fields of transmission technology (automation, gearboxes and winches), plain bearing technology, machinecomponents, foundry technology and steel profiles.

HYDROSTATICBEARING SYSTEMS

2 3

1 Bearing clearance compensator –characteristic• ZOLLERN standard configuration for an

economical serial production• Ready-to-install bearings• Compact design• No adjustment of preliminary throttles

after installation• High running speeds, up to 50 m/s• Use of low-viscosity oils or fluids• Constant pocket pressure, independent

of running speed with an iso-viscousbehaviour of the ZOLLERN clearancecompensator

• High operation accuracy• High stiffness • Best-efficient damping

• ZOLLERN bearing clearance compensator

• Precision flow divider

• Capillary throttles/tubes

2 Precision flow-divider – characteristic• High bearing loads• High bearing stiffness• Low hydrostatic power-loss• Feasibility of generous bearing

clearances • Bearing systems with and without

wrap-around• External piping required

3 Capillary tubes – characteristic • Low sliding speed• Bearing systems without wrap-around• Single hydrostatic pockets• Adjustment of capillaries required after

production

HYDROSTATIC THROTTLE SYSTEMS

1 2 3

The long experience by our company in thefield of slide bearing metallurgy led us to thedevelopment of hydrostatic bearing systems.From the outset, ZOLLERN has used a spe-cial form of preliminary throttle system, theso-called ‘ZOLLERN bearing clearance compensator’.

Bearing operationThe respective Plateau in the centre of eachpocket is machined by the same plane of the bearing. A pump groove PP which is connected to the pressure pump is milledinto the centre of each plateau. The pocketgrooves PT are arranged to the left and theright of the pump grooves. The compressedoil flows sideways to the pocket grooves PT

and supply the opposite arranged bearingpocket with compressed oil, by a bypasschannel.

Now if the shaft is loaded by the force F, anoff-centre displacement is done which givesin the lower area to a reduction of the throt-tle gap and in the upper area to an enlarge-ment of the throttle gap. The ratio is the so-called relative gap modification. This displacement also modifies the outflowgaps from the bearing pockets in the sameway, the pressure falls in the upper pocket to an over-proportional extent and rise up in the lower pocket to an over-proportionalvalue.The pressure difference between the pock-ets, multiplied by their effective surfacearea, produces definitely the same counter-force as the force applied.

PlateauPP pump groove

PT pocket groove


OIL TANK

PRESSUREPUMP

h0

CONTROL LINETHROTTLE POCKET

THROTTLE ZONE

BEARING POCKET

BEARING POCKETCOMPRESSED OILSUPPLY

ht = (1+X) x h0

hb = (1-X) x h0X =

h0

Δh

Δh

ZOLLERN BEARING CLEARANCE COMPENSATOR

4 5

Name of compound Properties Application

St/SnSb8Cu4 • Best sliding properties and emergency- • Radial bearingsrun characteristics • Thrust bearings

• High sliding speeds• Outstanding embedding • Surface pressure up to 15 N/mm2

St/AlSn20 • Good sliding properties and emergency- • Guide plates St/CuPb22Sn run characteristics

• Good embedding capability• Surface pressure up to 18 N/mm2 / 75 N/mm2

St/CuPb20Sn5 • Good sliding properties and emergency- • Thrust bearings St/CuPb15Sn8 run characteristics • Radial bearings

• Good embedding capability• High surface pressure up to 75 N/mm2

St/plastic • Good sliding properties and emergency- • Air gap sealsrun characteristics • Water bearings

• Corrosion resistance• Surface pressure up to 8 N/mm2

Special bearing materials

CuAl10Ni5Fe4 • High strength aluminium-bronze • Special bearings• Good sliding properties and emergency- • Water bearings

run characteristics• Tensile strengths up to 750 N/mm2

• High corrosion resistance

Compound castings for efficient hydrostatic applications

We optimize our hydrostatic bearing components with special

compound materials. By using different combinations, we are

able to meet your demands for products, capable fulfilling the

most wide-ranging applications. Thereby we produce diffusion

bonds between steel and lead-bronze, steel and white metal as

well as compounds based on aluminum.

COMPOUND BEARING MATERIALS


• Grinding spindle units

• Milling spindle units

• Workpiece- and turning spindle units

• Fine drilling spindle units

• Multi-spindle units

1

2 3 4

1 Grinding spindle unitBearing diameter: 110 mmSpindle speed: 1500–6000 rpmRadial and axial runout: < 0.5 µmApplication: high precision grinder

2 Fine drilling spindle unit, 3-wayBearing diameter: 70 mmSpindle speed: 1000–6000 rpmWorkpiece roundness: < 0.5–1 µmApplication: fine drilling of conrod bearing holes in one production step

3 Multi-spindle unit, 7-wayBearing diameters: 32–50 mmSpindle speed: 1800–4000 rpmWorkpiece roundness: < 0.5–1 µm Application: simultaneous fine drilling ofbearing holes

4 Drilling rod guideBearing diameter: 40 mmSpindle speed: 2500 rpmRadial runout: < 0.5 µmApplication: drilling-rod guidance

HYDROSTATIC SPINDLE UNITS

6 7

Features

• Outstanding high machining accuracy, radial and axial runout < 0.5 µm

• High radial and axial stiffness

• No vibration from rolling elements

• Maximum damping of vibrations from machining process

• High surface quality and reduced tool wear through damping oil film

• Full load of bearing capacity and stiffness even at speed zero

• Wear-free, no mixed friction zone on starting and run-down

• Peripheral speeds up to 65 m/s

• Throttle system insensitive to turbulence and running gap

• Thermal stable, direct heat dissipation through lubricating oil

• Compact design; no external controller required,

thanks integrated ZOLLERN bearing clearance compensator

• Sealing effected by non-contact air-gap seals

3

5

5 Rotary-table unitBearing diameter: 550 mmFace-chuck diameter: 1000mmAxial load: 120 KNApplication: measuring machines,vertical grindersRadial axial runout: < 1µm

1

2

Features• Unlimited theoretical lifetime• Outstanding suitable for oscillation movements• No ball redirection from rolling elements• No friction by low motion, no stick-slip effect• Maximum positioning accuracy, no backlash• High damping by oil-filled lubrication gap• No vibrations from rolling elements

1 Hydrostatic C-guide rails with screw-mounted guide platesSpeed: 24 m/min. Operating accuracy: < 1 µmApplication: revolver guidance for lathes/hard machining

2 Hydrostatic guideway unit with integrated linear motor.Run-off precision: < 1µm.Stroke: 350mmApplication: infeed-axis for grinders

3 Hydrostatic guide platesScrew-mounted guide plates with integrated preliminary throttleDimensions: from 70 x 30 x 7 mm up to 440 x 245 x 22 mm.

• Maximum possible damping of vibrations from machining process

• High security against collisions• Wear-free, no metallic contact• Speeds up to 50 m/s• Thermal stable, direct heat dissipation

through lubrication oil• High machining accuracy and repeatability

3 4 5


• Guideways with and without wrap-around

• Guideway-units with linear motors

• Round guideways, simultaneous linear-

and rotary movements

• V-Flat guides

• Guide rails

• Guide plates

4 Hydrostatic guide railStroke: 800 mmRun-off accuracy: < 1 µmApplication: ready-to-install components for slide-guide

5 Hydrostatic V-FlatStroke: 200 mmOscillation: 300 min-1

Run-off accuracy: < 2 µmApplication: rapidly oscillating slides

HYDROSTATIC GUIDEWAYS

8 9

1

2

• Rotary-table bearings

• Bearing sets

• Bearing segments

• Thin-walled radial bearings

• Supporting bearings

1 Radial supporting bearingsBearing diameter: 100 up to 800 mmOperating accuracy: < 2 µmRadial loads: up to 100 KNWater can be used as pressurized medium

2 Radial bearingsSystem: bearing clearance compensatorBearing diameter: 430 mmSpeed: 1600 rpmOperating load: 13,000 NRadial runout: < 1 µmApplication: special lathes

3 Thin-walled radial bearings Bearing diameters: 60 up to 240 mmPre-finished to shrink in the machine housingHigh damping by constant oil film, significantly longer tool lifeOperating accuracy: < 1 µmApplication: spindle sleeves for machine tools,shrink-fitted into the machine housing

4 Radial-axial bearings – rotary table bearingsApplicable instead of YRT ball-bearingsBearing diameters: 250–2000 mmOperating accuracy: < 2 µmAxial loads: up to 500 KNRadial loads: up to 50 KNApplication: rotary table bearings for machine tools and heavy machining centres

5 Radial bearings – spindle sleeves Bearing diameters: 80–500 mmHigh damping, significantly longer tool lifeApplication: spindle sleeves for main-spindle-bearings of vertical lathes

6 Heavy-duty radial-axial bearingSystem: pump per pocketBearing size: ø500mm x 350 mmOperating load: 500 000 NSpindle speed: 200 rpmRadial and axial runout: < 5 µmApplication: heavy duty lathes

3

4 5 6

Features• Compact design• Applicable into existing machines • High positioning accuracy, frictionless by low speed• Rotary-table bearings from diameter 80 mm up to 2000 mm• Spindle sleeve bearings from diameter 35 mm up to diameter 500 mm

Integrated linear and rotary movements in a single bearing

HYDROSTATICBEARING COMPONENTS

1

2

1 Radial bearings for test cylindersPiston rod diameters: 45 up to 440 mmMaterial: steel/bronzeOperating pressure: 280 bar

2 Friction balance test rigMeasurement of the friction torque of roller bearings under several operating loads

3 Bearing unit, special designBearing size: 260 mmSpeed: 1200 rpmApplication: tire test rig for measuring the tire-noise

Features• High radial and axial stiffness• No vibrations by rolling elements• Maximum possible damping of vibrations from testing process• Feasibility of making precise measurements of friction torques• Frictionless by low speed • Maximum load capacity already at speed zero• Free of wear, no metal to metal contact


4 Friction balanceRadial load: 250 kN Axial load: 100 kNTransmission of force via bearing housingApplication: measurement of friction torque of rollerbearings

5 Radial bearings, special configurationBearing diameter: 240 mmRadial load: 250 kNAxial load: 45 kNApplication: test-system for testing hydrodynamic slide bearings

4 53

SPECIAL HYDROSTATICTEST BEARINGS

Features• Unlimited theoretical life-time• No vibrations from rolling elements• No ball backlash through rolling element

by reversal of rotation direction• Frictionless by low speeds, in that way

maximum positioning accuracy• No stick-slip effect• Economical alternative to linear motors

Hydrostatic lead screw ZHGT 63x14

10 11

Hydrostatic lead screws permit the wear-free transmissionof power from rotary movements to linear movements.Thanks to the no-play and hydrostatic pre-stressed nut, the hydrostatic lead screws are particularly suitable forhighly dynamic, precise positioning functions in continuousnon-stop operation.

• Free of wear, no metal contact between the elements

• Speeds up to 90 m/min.• Thermally stable, direct heat dissipation

through lubricant• Excellent suitable for rapid, oscillating movements• Lead screws with external dimensions to

customers' specifications can be supplied

HYDROSTATICLEAD SCREWS


• Oil supply systems

• Oil cooling systems

• Monitoring components

• On-site commissioning service

ADDITIONAL EQUIPMENT

12 13

Engineering services• Planning and delivery of complete oil supply system, oil cooling system included• Delivery of components for monitoring pocket-pressure or monitoring volumetric

flow rate of the hydrostatic system• If required by the customer, commissioning of complete systems on-site• Use of low-pulsation, low-noise internal gear pumps

ENQUIRY FOR HYDROSTATIC GUIDEWAYS

Note

Linear motorHydrostatic lead screwball screwOther

Mode of drive Type of guide Application

Round guideFlat guide with or without wrap-aroundV-flat guideDetermined by ZOLLERN

GrindingTurningMillingOther

HorizontalVerticalangular °

Installation positionRun-off precisionKinetic magnitudes

Supporting guide µmDirectional guide µm

Determined by Zollern

a max m/s2

v max m/minn osc min-1

stroke mm

Oil viscosity: VG mm2/s at 40°CPump pressure barOil inlet temperature min. °C

max. °C

Loads

Max. weight of slide N Slide centre of gravityMax. weight of replaceable build-up construction N Centre of gravity of replaceable build-up constructionMax. machining forces N Point of application of machining forces

To enable us to design your hydrostatic guideway, please enclose a cross-section drawingor sketch of the existing guide or the intended location showing the available space.

Hydraulic

Operating temperature °CAmbient temperature °C

Determined by ZOLLERN

ZOLLERN GmbH & Co. KGHeustrasse 1, D-88518 Herbertingen

Sales hydrostatic:

Tel. +49 75 86 95 95 38 Mr. Knaus Fax +49 75 86 95 97 15

eMail [email protected]

Name

Company

Address

Tel. Fax

Email Date


14 15

ENQUIRY FOR HYDROSTATIC SPINDLES

Note

Built-in motorBelt driveOther

Mode of drive Installation position Application

HorizontalVerticalangular °

Grinding spindle Tool spindleTurning spindle Workpiece spindle Milling spindle Test spindle

Radial runout µmAxial runout µm


Operating accuracyOperating data

Hydraulic

Spindle speed max.: rpmBearing stiffness radial N/µm

axial N/µm

Spindle diameter mmSpindle opening mm

Max. radial loads/spindle nose N Points of application of machining forcesMax. radial loads/drive side N Points of application/radial loadsMax. axial loads N Points of application/axial loads

Loads

To enable us to design your hydrostatic spindle, please enclose a cross-section drawing or sketch of existing spindle or the intended location showing the available space.

Oil viscosity: VG mm2/s at 40°CPump pressure barOil inlet temperature: min. °C

max. °C

Operating temperature: °CAmbient temperature °C


ZOLLERN GmbH & Co. KGHeustrasse 1, D-88518 Herbertingen

Sales hydrostatic:

Tel. +49 75 86 95 95 38 Mr. Knaus Fax +49 75 86 95 97 15


Name

Company

Address

Tel. Fax

Email Date


16 17


Plants of the Zollern group of companies

Laucherthal plant

ZOLLERN GmbH & Co. KG

Mannheim plant

ZOLLERN ISOPROFIL GmbH & Co. KG

Portugal plant

ZOLLERN & Comandita

China plant

ZOLLERN (Tianjin) Machinery Co., LTD.

Dorsten plant

ZOLLERN Dorstener AntriebstechnikGmbH & Co. KG

Braunschweig plant

ZOLLERN BHW GleitlagerGmbH & Co. KG

Osterode plant

ZOLLERN BHW GleitlagerGmbH & Co. KG

Plain Bearing TechnologyAv. Manoel Inácio Peixoto, 2147BR-36771-000 Cataguases MGTel. +55 32 34 29 20 02Fax +55 32 34 29 20 26eMail [email protected]

Brazil plant

ZOLLERN Transmissoes MecanicasLTDA

Plain Bearing TechnologyRolandsweg 16 – 20D-37520 Osterode am Harz Tel. +49 55 22 31 27 0Fax +49 55 22 31 27 99eMail [email protected]

Transmission TechnologyGearsHüttenstraße 1D-46284 DorstenTel. +49 23 62 67 0Fax +49 23 62 67 40 3eMail [email protected]

Transmission TechnologyNo. 79, 11th Avenue TEDA 300 457 TianjinPeoples Republic of CHINATel. +86 22 25 32 38 11Fax +86 22 25 32 38 10eMail [email protected]

Steel ProfilesPostfach 24 03 59D-68173 MannheimTel. +49 62 18 45 90Fax +49 62 18 45 92 63eMail [email protected]

Steel ProfilesPostfach 12 20D-72481 SigmaringenTel. +49 75 71 70 24 6Fax +49 75 71 70 27 5eMail [email protected]

Foundry TechnologyRua Jorge Ferreirinha, 1095Apartado 1027P-4470-314 Vermoim MAIATel. +351 22 94 14 68 1Fax +351 22 94 14 69 5eMail [email protected]

Plain Bearing TechnologyPostfach 32 13D-38022 BraunschweigTel. +49 53 12 60 50Fax +49 53 12 60 53 00eMail [email protected]

Mechanical Engineering ComponentsPostfach 12 65D-88322 AulendorfTel. +49 75 25 94 81 30Fax +49 75 25 94 81 00eMail [email protected]

Foundry TechnologyPostfach 12 20D-72481 SigmaringenTel. +49 75 71 70 44 0Fax +49 75 71 70 60 1eMail [email protected]

Sales:Tel. +49 75 71 70 24 6Fax +49 75 71 70 27 5eMail [email protected]

France plant

ZOLLERN TLC SAS

Plain Bearing Technology62, Rue Pierre CurieB.P.No 1055F-78131 Les Mureaux CEDEXTel. +33 1 34 74 39 00Fax +33 1 34 74 28 52eMail [email protected]

Sweden plant

ZOLLERN Norden AB

P. O. Box 233SE-73224 ArbogaTel. +46 58 91 60 35Fax +46 58 91 20 02eMail [email protected]

USA plant

ZOLLERN North America L.P.

283 Lockhaven Drive Suite 204Houston TX 77073USATel. +1 71 36 73 79 02Fax +1 71 36 73 79 50eMail [email protected]

Romania plant

S.C. Zollern S.R.L.

0317235 Pecica FNFerma 20Arad - Romania

Switzerland plant

ZOLLERN-MIMTEC AG

Foundry TechnologySäntisstrasse 11CH-9401 RorschachTel. +41 71 844 16 88Fax +41 71 844 16 77eMail [email protected] www.mimtec.com

Aulendorf plant

ZOLLERN MaschinenbauelementeGmbH & Co. KG

Soest plant

ZOLLERN Aluminium-Feinguss SoestGmbH & Co. KG

Foundry TechnologyOverweg 15 D-59494 SoestTel. +49 2921 7896-0Fax +49 2921 [email protected]

France ZOLLERN S.à.r.l13, Rue AllwiesF-57200 SarregueminesTel. +33 3 87 95 35 14Fax +33 3 87 95 35 21


Great Britain Zollern UK LimitedCastle HillKenilworthGB-CV8 1NBTel. +44 19 26 51 54 20 Fax +44 19 26 85 34 11

eMail [email protected] www.zollern.co.uk

Italy ZOLLERN Italiana S.r.L.Via della Ciocca, 9 I-21026 Gavirate (VA)Tel. +39 03 32 46 20 59Fax +39 03 32 46 20 67


Netherlands ZOLLERN Nederland B.V.Postbus 134NL-5150 AC DRUNENTel. +31 41 63 22 92 0Fax +31 41 63 20 93 6

eMail [email protected] www.zollern.nl

Sales offices

18 19


Transmission TechnologyHeustraße 1D-88518 Herbertingen

Herbertingen plant

CONTACT

We offer comprehensive project management:• Many years of project experience• CAD masters• Project meetings on-site and plant inspections• Detailed, binding offers


Plain Bearing TechnologyHeustraße 1D-88518 HerbertingenTel. +49 75 86 95 95 20Fax +49 75 86 95 97 15eMail [email protected]

AutomationDivisionTel. +49 75 86 95 95 86Fax +49 75 86 95 95 85eMail [email protected]

Gears and WinchesDivisionTel. +49 75 86 95 95 47Fax +49 75 86 95 95 75eMail [email protected]


Plain Bearing TechnologyHeustraße 1D-88518 HerbertingenTel. +49 75 86 95 95 20Fax +49 75 86 95 97 15eMail [email protected]

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PLAIN BEARING TECHNOLOGY · PDF fileHYDROSTATIC BEARING SYSTEMS OIL TANK PRESSURE PUMP h 0 CONTROL LINE THROTTLE POCKET ... 4 Drilling rod guide Bearing ... with integrated linear

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