marginally lubricatedold.servicatalogue.com/katalogdata/pdf/650050-1-1-1.pdf · energrease gsf...

DX®

Marginally lubricated

Designer´s Handbook

I

Quality

All the products described in this handbook are manufactured under DIN EN ISO 9001, ISO/TS 16949 and ISO 14001approved quality management systems.All Certificates can be downloaded as PDF files from our website www.ggbearings.com.In addition GGB North America has been certified AS9100 revision B complying with the requirements of aerospaceindustry’s quality management system for the manufacture of metal-backed bearings and filament wound bearings andwashers.

AMERICA FRANCE

GERMANY BRAZIL

SLOVAKIA CHINA

II

Formula Symbols and Designations

FormulaSymbol

Unit Designation

aB - Bearing size factor

aE - High load factor

aQ - Speed/Load factor

aS - Surface finish factor

aT - Temperature application factor

B mm Nominal bush width

C 1/min Dynamic load frequency

CD mm Installed diametral clearance

CDm mm Diametral clearance machined

Ci mm Total number of dynamic load cycles

Co mm ID chamfer length

CT - OD chamfer length

DH mm Housing Diameter

Di mm Nominal bush/thrust washer ID

Di,a mm Bush ID when assembled in housing

Di,a,m mm Bush ID assembled and machined

DJ mm Shaft diameter

DJm mm Shaft diameter for machined bushes

Do mm Nominal bush/thrust washer OD

dD mm Dowel hole diameter

dL mm Oil hole diameter

dP mm Pitch circle diameter for dowel hole

F N Bearing load

Fi N Insertion force

f - Friction

Ha mm Depth of Housing Recess(e.g. for thrust washers)

Hd mm Diameter of Housing Recess(thrust washers)

L mm Strip length

LH h Bearing service life

LRG h Relubrication interval

n 1/min Rotational speed

nosc 1/min Oscillating movement frequency

p MPa Specific load

plim MPa Specific load limit

psta,max MPa Maximum static load

pdyn,max MPa Maximum dynamic load

Q - Total number of cycles

R - Number of lubrication intervals

Ra µm Surface roughness (DIN 4768, ISO/DIN 4287/1)

s3 mm Bush wall thickness

sS mm Strip thickness

sT mm Thrust washer thickness

T °C Temperature

Tamb °C Ambient temperature

Tmax °C Maximum temperature

Tmin °C Minimum temperature

v - Sliding speed

u m/s speed factor

W mm Strip width

Wu min mm Minimum usable strip width

α1 1/106K Coefficient of linear thermal expansionparallel to surface

α2 1/106K Coefficient of linear thermal expansionnormal to surface

σc MPa Compressive Yield strength

λ W/mK Thermal conductivity

ϕ ° Angular displacement

η Ns/mm² Dynamic Viscosity

ZT - Total number of osscillating movements

FormulaSymbol

Unit Designation

Content

3

Content

Quality . . . . . . . . . . . . . . . . . . . . . IFormula Symbolsand Designations . . . . . . . . . . . . . II

1 Introduction . . . . . . . . . . . 4

1.1 Characteristicsand Advantages . . . . . . . . . . . . . 4

2 Structure . . . . . . . . . . . . . 4

2.1 Basic Forms . . . . . . . . . . . . . . . . 5

3 Properties . . . . . . . . . . . . . 6

3.1 Physical Properties . . . . . . . . . . 6

3.2 Chemical Properties . . . . . . . . . 6

4 Lubrication . . . . . . . . . . . . 7

4.1 Choice of Lubricant . . . . . . . . . . 7Grease . . . . . . . . . . . . . . . . . . . . . 8Oil . . . . . . . . . . . . . . . . . . . . . . . . 8Non lubricating fluids . . . . . . . . . . 8

4.2 Friction . . . . . . . . . . . . . . . . . . . . 9

4.3 Lubricated Environments . . . . . 9Lubrication . . . . . . . . . . . . . . . . . . 9

4.4 Characteristics ofFluid Lubricated DX Bearings 10

4.5 Design Guidance forFluid Lubricated Applications 10

4.6 Wear Rate andRelubrication Intervalswith Grease lubrication . . . . . . 12Fretting Wear . . . . . . . . . . . . . . . 12

5 Design Factors . . . . . . . 13

5.1 Specific Load . . . . . . . . . . . . . . 13Specific Load Limit . . . . . . . . . . . 13

5.2 Sliding Speed . . . . . . . . . . . . . . 14Continuous Rotation . . . . . . . . . 14Oscillating Movement . . . . . . . . 14

5.3 pv Factor . . . . . . . . . . . . . . . . . . 15

5.4 Load . . . . . . . . . . . . . . . . . . . . . 15Type of Load . . . . . . . . . . . . . . . 15

5.5 Temperature . . . . . . . . . . . . . . . 17

5.6 Mating Surface . . . . . . . . . . . . . 17

5.7 Bearing Size . . . . . . . . . . . . . . . 18

5.8 Estimation of BearingService Life withGrease Lubrication . . . . . . . . . 18

5.9 Worked Examples . . . . . . . . . . 20

6 Bearing Assembly . . . . . 21

6.1 Dimensions and Tolerances . . 21

6.2 Tolerances forminimum clearance . . . . . . . . . 21Grease lubrication . . . . . . . . . . . 21Fluid Lubrication . . . . . . . . . . . . . 23Allowance forThermal Expansion . . . . . . . . . . 23

6.3 Counterface Design . . . . . . . . . 24

6.4 Installation . . . . . . . . . . . . . . . . 25Fitting of Bushes . . . . . . . . . . . . 25Insertion Forces . . . . . . . . . . . . . 25Alignment . . . . . . . . . . . . . . . . . . 26Sealing . . . . . . . . . . . . . . . . . . . . 26Axial Location . . . . . . . . . . . . . . . 26Fitting of Thrust Washers . . . . . . 26Slideways . . . . . . . . . . . . . . . . . . 27

7 Machining . . . . . . . . . . . 28

7.1 Machining Practice . . . . . . . . . 28

7.2 Boring . . . . . . . . . . . . . . . . . . . . 28

7.3 Reaming . . . . . . . . . . . . . . . . . . 29

7.4 Broaching . . . . . . . . . . . . . . . . . 29

7.5 Vibrobroaching . . . . . . . . . . . . . 30

7.6 Modification of components . . 30

7.7 Drilling Oil Holes . . . . . . . . . . . 30

7.8 Cutting Strip Material . . . . . . . . 30

7.9 Electroplating . . . . . . . . . . . . . . 31DX Components . . . . . . . . . . . . . 31Mating Surfaces . . . . . . . . . . . . . 31

8 Standard Products . . . . 32

8.1 PM-DX cylindrical bushes . . . . 32

8.2 MB-DX cylindrical bushes . . . . 39

8.3 DX Thrust Washers . . . . . . . . . 44

8.4 DX cylindrical bushes -Inch sizes . . . . . . . . . . . . . . . . . 45

8.5 DX Thrust Washers -Inch sizes . . . . . . . . . . . . . . . . . 48

8.6 DX Strip . . . . . . . . . . . . . . . . . . . 49

8.7 DX Strip - Inch sizes . . . . . . . . . 49

9 Data Sheet for bearing design . . . . . . . . 50

1 Introduction

4

1 IntroductionThe purpose of this handbook is to providecomprehensive technical information onthe characteristics of DX® bearings. Theinformation given, permits designers toestablish the correct size of bearingrequired and the expected life and per-formance. GGB Research and Develop-ment services are available to assist withunusual design problems.

Complete information on the range of DXstandard stock products is given togetherwith details of other DX products.

GGB is continually refining and extendingits experimental and theoretical knowledgeand, therefore, when using this brochure itis always worthwhile to contact the Com-pany should additional information berequired.

Customers are advised to carry out proto-type testing wherever possible.

1.1 Characteristics and Advantages• DX provides maintenance free

operation

• DX has a high pv capability

• DX exhibits low wear rate

• Seizure resistant

• Suitable for temperatures from-40 to +120 °C

• High static and dynamic load capacity

• Good frictional properties

• No water absorption and thereforedimensionally stable

• Compact and light

• Suitable for rotating, oscillating,reciprocating and sliding movements

• DX bearings are prefinished andrequire no machining after assembly

2 StructureDX is a composite bearing material devel-oped specifically to operate with marginallubrication and consists of three bondedlayers: a steel backing strip and a sinteredporous bronze matrix, impregnated andoverlaid with a pigmented acetal copoly-mer bearing material.

The steel backing provides mechanicalstrength and the bronze interlayer providesa strong mechanical bond for the lining.This construction promotes dimensionalstability and improves thermal conductivity,thus reducing the temperature at the bear-ing surface.

DX is designed for use with grease lubrica-tion and the bearing surface is normallyprovided with a uniform pattern of indentsThese serve as a reservoir for the grease

and are designed to provide the optimumdistribution of the lubricant over the bear-ing surface.

Fig. 1: DX-microsection

Bronze sinter layer

Sliding layer: acetal co-polymer, with or with-out lubrication indents

Steel backing

2Structure

5

2.1 Basic FormsStandard Components available from stock

These products are manufactured to Inter-national, National or GGB standarddesigns.

Metric and Imperial Sizes• Cylindrical Bushes

- PM pre finished metric range, not machinable in situ, for use with standard journals finished to h6-h8 limits.

- MB machinable metric range, with an

allowance for machining in situ.- Machinable inch range for use as sup-

plied or after machining in situ.• Thrust Washers

• Strip Material

Fig. 2: Standard components

Non Standard Components not available from stock

These products are manufactured to cus-tomers’ requirements with or without GGBrecommendations, and include for exam-ple

• Modified Standard Components

• Half Bearings

• Flat Components

• Pressings

• Stampings

Fig. 3: Non standard components

3 Properties

6

3 Properties

3.1 Physical Properties

Table 1: Properties of DX

3.2 Chemical PropertiesThe following table provides an indicationof the resistance of DX to various chemicalmedia. It is recommended that the chemi-

cal resistance is confirmed by testing ifpossiple.

Table 2: Chemical resistance of DX

Characteristic Symbol Value DX Unit Comments

Physical Properties

Thermal Conductivity λ 52 W/mK

Coefficient of linear thermal expansion

parallel to surface α1 11 1/106K

normal to surface α2 29 1/106K

Maximum OperatingTemperature

Tmax 120 °C

Minimum OperatingTemperature

Tmin –40 °C

MechanicalProperties

Compressive Yield Strength

σc 380 MPameasured on disc5 mm diameter x 2.45 mm thick.

Maximum Load

Static psta,max 140 MPa

Dynamic pdyn,max 70 MPa

Electrical Properties

Volume resistivity of acetal lining

1015 Ωcm

Chemical % °C Rating

Strong Acids Hydrochloric Acid 5 20 -

Nitric Acid 5 20 -

Sulphuric Acid 5 20 -

Weak Acids Acetic Acid 5 20 -

Formic Acid 5 20 -

Bases Ammonia 10 20 o

Sodium Hydroxide 5 20 o

Solvents Acetone 20 +

Carbon Tetrachloride 20 +

Lubricants and fuels Paraffin 20 +

Gasolene 20 +

Kerosene 20 +

Diesel fuel 20 +

Mineral Oil 70 o

HFA-ISO46 High Water fluid 70 o

HFC-Water-Glycol 70 o

HFD-Phosphate Ester 70 +

Water 20 o

Sea Water 20 -

+Satisfactory: Corrosion damage is unlikely to occur.

o

Acceptable: Some corrosion damage may occur but this will not be sufficient to impair either the structural integrity or the tribo-logical performance of the material.

-

Unsatisfactory: Corrosion damage will occur and is likely to affect either the structural integrity and/or the tribological performance of the material.

4Lubrication

7

4 Lubrication

4.1 Choice of LubricantDX must be lubricated. The choice of lubri-cant depends upon pv and the slidingspeed and the stability of the lubricantunder the operating conditions.

Table 3: Performance of greases

+ Recommended

o Satisfactory

- Not recommended

NA Data not available

Manufacturer Grade Type Rating

BP Energrease LS2 Mineral Lithium Soap +

Energrease LT2 Mineral Lithium Soap +

Energrease FGL Mineral Non Soap o

Energrease GSF Synthetic NA o

Century Lacerta ASD Mineral Lithium/Polymer o

Lacerta CL2X Mineral Calcium -

Dow Corning Molykote 55M Silicone Lithium Soap o

Molykote PG65 PAO Lithium Soap +

Molykote PG75 Synthetic/Mineral Lithium Soap +

Molykote PG602 Mineral Lithium Soap o

Elf Rolexa.1 Mineral Lithium Soap +

Rolexa.2 Mineral Lithium Soap o

Epexelf.2 Mineral Lithium/Calcium Soap o

Esso Andok C Mineral Sodium Soap o

Andok 260 Mineral Sodium Soap o

Cazar K Mineral Calcium Soap -

Mobil Mobilplex 47 Mineral Calcium Soap o

Mobiltemp 1 Mineral Non Soap +

Rocol BG622 White Mineral Calcium Soap o

Sapphire Mineral Lithium Complex o

White Food Grease White Oil Clay -

Shell Albida R2 Mineral Lithium Complex +

Axinus S2 Mineral Lithium o

Darina R2 Mineral Inorganic Non Soap +

Stamina U2 Mineral Polyurea o

Tivela A Synthetic NA +

Sovereign Omega 77 Mineral Lithium o

Omega 85 Mineral Polyurea -

Tom Pac Tom Pac NA NA o

Total Aerogrease Synthetic NA +

Multis EP2 NA Lithium -

4 Lubrication

8

Grease

Grease lubrication is the recommendedmethod of lubrication. The performanceratings of different types of grease are indi-cated in Table 3. For environmental tem-peratures above 50 °C the grease should

contain an anti-oxidant additive. Greasescontaining EP additives or significant addi-tions of graphite or MoS2 are not generallyrecommended for use with DX.

OilDX is not generally suitable for use withhydrocarbon oils operating above 115 °C.At these temperatures oxidation of the oilmay produce a low concentration of labileresidues, acid or free radical, which willcause depolymerisation of the DX acetalcopolymer bearing lining. Such oxidation

can also occur after prolonged periods atlower temperatures. In practice, thismeans that DX is not recommended foruse with recirculating oil systems or bathsystems where sump temperatures of70 °C or greater are possible.

Non lubricating fluidsCare must be taken when using DX withnon lubricating fluids as indicated below.

WaterDX is only suitable for operation in waterwhen the load and speed permit full hydro-

dynamic conditions to be established (seeFig. 7).

Water-Oil EmulsionDX is suitable for use with 95/5 water/oilemulsions, however initial operation with

pure oil or grease is recommended beforetransferring to emulsion.

Shock-Absorber OilsDX is not compatible with shock-absorberoils at operating temperature.

PetrolWith petrol as a lubricant at a pv factor of0.21 MPa x m/s the wear rate of DX hasbeen found to be about 4-5 times greater

than that of an initially greased bearingunder the same pv conditions.

Kerosene and PolybuteneThe wear rate of DX with these fluids hasbeen found to be equivalent to thatobtained with a light hydrocarbon oil.

Other FluidsPolyester, polyethylene glycol and polygly-col lubricants give similar wear rates withDX to light hydrocarbon oil. With the glycolfluids however the operating temperaturemust not exceed 80 °C because the acetallining of DX could then be attacked bythese fluids.

In general, the fluid will be acceptable if itdoes not chemically attack the acetal liningor the porous bronze interlayer. Chemicalresistance data are given in Table 2.

Where there is doubt about the suitabilityof a fluid, a simple test is to submerge a

sample of DX material in the fluid for two tothree weeks at 15-20 °C above the operat-ing temperature. The following will usuallyindicate that the fluid is not suitable for usewith DX.

• A significant change in the thickness ofthe DX material.

• A visible change in the bearing surfacefrom polished to matt.

• A visible change in the microstructure ofthe bronze interlayer.

4Lubrication

9

4.2 FrictionLubricated DX bearings show negligible‘stick-slip’ and provide smooth slidingbetween adjacent surfaces. The coefficientof friction of lubricated DX depends upon

the actual operating conditions as indi-cated in section 4.3. Where frictional char-acteristics are critical to a design theyshould be established by prototype testing.

4.3 Lubricated EnvironmentsThe following sections describe the basicsof lubrication and provide guidance on theapplication of DX in such environments.

Lubrication There are three modes of lubricated bear-ing operation which relate to the thicknessof the developed lubricant film between thebearing and the mating surface.

These three modes of operation dependupon:

• Bearing dimensions

• Clearance

• Load and Speed

• Lubricant Viscosity and Flow

Hydrodynamic lubrication Characterised by:• Complete separation of the shaft from

the bearing by the lubricant film.

• Very low friction and no wear of thebearing or shaft since there is nocontact.

• Coefficients of friction of 0.001 to 0.01.Fig. 4: Hydrodynamic lubrication

Hydrodynamic conditions occur when

Mixed film lubricationCharacterised by:• Combination of hydrodynamic and

boundary lubrication.

• Part of the load is carried by localisedareas of self pressurised lubricant andthe remainder supported by boundarylubrication.

• Coefficients of friction of 0.01 to 0.10.

• Friction and wear depend upon the deg-ree of hydrodynamic support developed.

• DX provides low friction and high wearresistance to support the boundarylubricated element of the load.

Fig. 5: Mixed film lubrication

pU η⋅7.5---------- B

Di

-----⋅≤

(4.3.1) [MPa]

4 Lubrication

10

Boundary lubrication

Characterised by:• Rubbing of the shaft against the bearing

with virtually no lubricant separating thetwo surfaces.

• Bearing material selection is critical toperformance.

• Shaft wear is likely due to contact bet-ween bearing and shaft.

• The excellent properties of DX materialminimises wear under these conditions.

• The dynamic coefficient of friction withDX is typically 0.02 to 0.1 under bound-ary lubrication conditions.

• The static coefficient of friction with DX istypically 0.03 to 0.15 under boundarylubrication conditions.

Fig. 6: Boundary lubrication

4.4 Characteristics of Fluid Lubricated DX BearingsDX is particularly effective in the mostdemanding of lubricated applications

where full hydrodynamic operation cannotbe maintained, for example:

• High load conditions

In highly loaded applications operating under boundary or mixed film conditions DX shows excellent wear resistance and low friction.

• Start up and shut down under load

With insufficient speed to generate a hydrodynamic film the bearing will operate under boundary or mixed film conditions.

- DX minimises wear- DX requires less start up torque than

conventional metallic bearings.

• Sparse lubrication

Many applications require the bearing to operate with less than the ideal lubricant supply, typically with splash or mist lubrication only. DX requires significantly less lubricant than conventional metallic bearings.

4.5 Design Guidance for Fluid Lubricated Applications

Fig. 7, shows the three lubricationregimes discussed above plotted on a

graph of sliding speed vs the ratio of spe-cific load to lubricant viscosity.

In order to use Fig. 7• Using the formulae in Section 5

- Calculate the specific load p- Calculate the shaft surface speed v

• Using the viscosity temperature relation-ships presented in Table 4.

- Determine the viscosity in centipoise of the lubricant.

Note:

Viscosity is a function of the operating tem-perature. If the operating temperature of

the fluid is unknown, a provisional temper-ature of 25 °C above ambient can be used.

4Lubrication

11

Area 1 of Fig. 7• The bearing will operate with boundary

lubrication.

• The pv factor will be the major deter-minant of bearing life.

• DX bearing performance can be estima-ted from the following equations.

• The effective pv Factor epv can beestimated from Section 5.8.

If epv/η ≤ 0.2 then

If 0.2 < epv/η ≤ 1.0 then

If epv/η >1.0 then

Area 2 of Fig. 7• The bearing will operate with mixed film

lubrication.

• pv factor is no longer a significantparameter in determining the bearing

life.

• DX bearing performance will dependupon the nature of the fluid and theactual service conditions.

Area 3 of Fig. 7• The bearing will operate with hydrody-

namic lubrication.• Bearing wear will be determined only by

the cleanliness of the lubri-cant and thefrequency of start up and shut down.

Area 4 of Fig. 7• These are the most demanding opera-

ting conditions.

• The bearing is operated under eitherhigh speed or high bearing load to visco-sity ratio, or a combination of both.

• These conditions may cause

- excessive operating temperature- and/or high wear rate.

• The bearing performance may be impro-ved:

- by use of unindented DX lining- by the addition of one or more grooves

to the bearing- by shaft surface finish Ra <0.05 [µm].

Fig. 7: Design guide for lubricated application

(4.5.1) [h]

LH2000epv

η----------

0.5-------------------- aQ aT aS⋅ ⋅ ⋅=

(4.5.2) [h]

LH1000epv

η---------- ---------------- aQ aT aS⋅ ⋅ ⋅=

(4.5.3) [h]

LH1000epv

η----------

2----------------- aQ aT aS⋅ ⋅ ⋅=

epv see (5.8), page 18

Spe

cific

be

arin

g lo

ad

p [

MP

a]

Journal surface speed v [m/s]

0.1

1.0

10

0.01 0.1 1.0 10

Increased clearances may be necessary

Detail bearing design may be necessary - consult the company

Area 1Effectively dry rubbing

Area 2Mixed film lubrication

Area 3Full hydrodynamic lu-brication

Area 4

Vis

cosi

ty η

[cP

]

Conditions:

- Steady unidirectional loading- Continuous, non reversing shaft rotation- Sufficient clearance between shaft and bearing- Sufficient lubricant flow

4 Lubrication

12

Table 4: Viscosity data

4.6 Wear Rate and Relubrication Intervals with Grease lubrication

At specific bearing loads below 100 MPa agrease lubricated DX bearing shows onlysmall bedding-in wear of about0.0025 mm. This is followed by little wearduring the early part of the bearing life untilthe lubricant becomes exhausted and thewear rate increases. If the bearing isregreased before the rate of wear starts toincrease rapidly the material will continueto function satisfactorily with little wear.Fig. 8 shows the typical wear pattern.

Under specific loads above 100 MPa theinitial bedding-in wear is greater, typicallyabout 0.025 mm, followed by a decreasingwear rate until the bearing exhibits a simi-lar wear/life relationship to that shown inFig. 8.

The useful life of the bearing is limited bywear in the loaded area. If this wearexceeds 0.15 mm the grease capacity ofthe indents is reduced and more frequentregreasing of the bearing will be required.

Fretting WearOscillating movements of less than thedimensions of the indent pattern maycause localised wear of the mating surfaceafter prolonged usage. This will result inthe indent pattern becoming transferred

onto the mating surface in contact with theDX bearing and may also give rise to fret-ting corrosion damage. In this situationDSTM material should be considered as analternative to DX.

Fig. 8: Typical wear of DX

Viscosity [cP]

Temperature [°C] 0 10 20 30 40 50 60 70 80 90 100 110 120 130 140

Lubricant

ISO VG 32 310 146 77 44 27 18 13 9.3 7.0 5.5 4.4 3.6 3.0 2.5 2.2

ISO VG 46 570 247 121 67 40 25 17 12 9.0 6.9 5.4 4.4 3.6 3.0 2.6

ISO VG 68 940 395 190 102 59 37 24 17 12 9.3 7.2 5.8 4.7 3.9 3.3

ISO VG 100 2110 780 335 164 89 52 33 22 15 11.3 8.6 6.7 5.3 4.3 3.6

ISO VG 150 3600 1290 540 255 134 77 48 31 21 15 11 8.8 7.0 5.6 4.6

Diesel oil 4.6 4.0 3.4 3.0 2.6 2.3 2.0 1.7 1.4 1.1 0.95

Petrol 0.6 0.56 0.52 0.48 0.44 0.40 0.36 0.33 0.31

Kerosene 2.0 1.7 1.5 1.3 1.1 0.95 0.85 0.75 0.65 0.60 0.55

Water 1.79 1.30 1.0 0.84 0.69 0.55 0.48 0.41 0.34 0.32 0.28

Rad

ial w

ear

[m

m]

Operating life

B

0.05

0.10

B B

Recommended re-greasing interval

End of useful life of pre-lubricated bearing - A

Initial greasing only

Recommended regreasing interval

Bearing continues with low rate of wear when regreased at intervals - B

5Design Factors

13

5 Design FactorsThe main parameters when determiningthe size or calculating the service life for aDX bearing are:

• Specific Load Limit plim [MPa]

• pv Factor [MPa x m/s]

• Mating surface roughness Ra [µm]

• Mating surface material

• Temperature T [°C]

• Other environmental factors eg. housingdesign, dirt, lubrication.

5.1 Specific LoadThe specific load p is defined as the work-ing load divided by the projected area ofthe bearing and is expressed in MPa.

Bushes

Thrust Washers

Slide Plates

Specific Load LimitThe maximum load which can be appliedto a DX bearing can be expressed in termsof the Specific Load Limit, which dependson the type of the loading and lubrication Itis highest under steady loads. The valuesof Specific Load Limit specified in Table 5assume good alignment between the bear-ing and mating surface.

The Specific Load Limit for DX reduces forbearing operating temperatures in excess

of 40 °C, falling to about half the valuesgiven in Table 5 for temperatures above100 °C.

Conditions of dynamic load or oscillatingmovement which produce fatigue stress inthe bearing result in a reduction in the per-missible Specific Load Limit (Fig. 9,).

Table 5: Specific load limit plim for DX

(5.1.1) [MPa]

p FDi B⋅------------=

(5.1.2) [MPa]

p 4F

π Do2 Di

2–( )⋅----------------------------=

(5.1.3) [MPa]

p FL W⋅------------=

Load Operating condition Lubrication plim

Steady Intermittent or very slow (below 0.01 m/s) continuous rotation or oscillating motion

Grease or oil 140

Steady Continuous rotation or oscillating motion

Grease or oil(boundary lubrication)

70

Steady or dynamic Continuous rotation or oscillating motion

Oil(hydrodynamic lubrication)

45

5 Design Factors

14

Fig. 9: DX specific load limits plim under dynamic loads or oscillating conditions

5.2 Sliding SpeedThe sliding speed v [m/s] is calculated asfollows:

Continuous RotationBushes Thrust Washers

Oscillating MovementBushes Thrust Washers

The maximum permissible effective pv fac-tor (epv factor) for grease lubricated DXbearings is dependent upon the sliding

speed as shown in Fig. 11. For slidingspeeds in excess of 2.5 m/s continuous oillubrication is recommended.

Fig. 11: Maximum epv factor for grease lubrication

Spe

cific

load

lim

it p l

im [M

Pa

]

Cycles Q

1041

10

100

105 106 107 108

vDi π n⋅ ⋅60 103⋅------------------=

(5.2.1) [m/s]

v

Do Di+2

---------------- π n⋅ ⋅

60 103⋅-----------------------------=

(5.2.2) [m/s]

vDi π⋅

60 103⋅------------------ 4ϕ nosc⋅

360-------------------⋅=

(5.2.3) [m/s]

v

Do Di+2

---------------- π⋅

60 103⋅----------------------- 4ϕ nosc⋅

360-------------------⋅=

(5.2.4) [m/s]

Fig. 10: Oscillating cycle ϕ

ϕ ϕ

412 3

epv

Fac

tor

[MP

a x m

/s]

Speed [m/s]

0

0.0

0.5

1.0

0.5 1.0 1.5 2.0 2.5

2.0

1.5

2.5

3.0

5Design Factors

15

5.3 pv FactorThe useful operating life of a DX bearing isgoverned by the pv factor, which is calcu-lated as follows:

5.4 LoadIn addition to its contribution to the pv fac-tor the type and direction of the appliedload also affects the performance of a DXbearing. This is accomodated in the calcu-

lation of the bearing service life by thespeed/load application factor aQ shown inFigs. 14-16.

Type of Load

Fig. 12: Steady load, vertically down-wards, bush stationary, shaft rotating. Lubricant drains to loa-ded area

Fig. 13: Rotating load, shaft stationary, bush rotating. Lubricant drains away from loaded area

pv p v⋅=

(5.3.1) [MPa x m/s]

F2---

F2---

FF2---

F2---

F

5 Design Factors

16

Fig. 14: Speed/Load factor aQ for MB range bushes - unmachined

Fig. 15: Speed/Load factor aQ for PM range and MB range bushes - machined

Fig. 16: Speed/Load factor aQ for thrust washers

Note: aQ = 1 for slideways

Rubbing speed v [m/s]

00.0

0.5

1.0

0.5 1.0 1.5 2.0 2.5

2.0

1.5

2.5

3.0

Rotating load

Steady load verticallydownwards

Dynamic load or steady loadnot downwards

Spe

ed/L

oad

fac

tor

a Q


00.0

0.5

1.0

0.5 1.0 1.5 2.0 2.5

2.0

1.5

2.5

3.0

Rotating load

Steady load verticallydownwards

Dynamic load or steady loadnot downwards

Sp

eed

/Loa

d fa

ctor

aQ


00.0

0.5

1.0

0.5 1.0 1.5 2.0 2.5

2.0

1.5

2.5

3.0

Sp

eed

/Lo

ad fa

ctor

aQ

5Design Factors

17

5.5 TemperatureThe useful life of a DX bearing dependsupon the operating temperature. The per-formance of grease lubricated DXdecreases at bearing temperatures above40 °C. This loss of performance is relatedto both material and lubricant effects.

For a given pv Factor the operating tem-perature of the bearing depends upon the

temperature of the surrounding environ-ment and the heat dissipation properties ofthe housing.

In calculating the service life of DX theseeffects are accomodated by the applicationfactor aT shown in Fig. 17.

Fig. 17: DX application factor aT

5.6 Mating SurfaceThe wear rate of DX is strongly dependentupon the roughness of the mating counter-face. For optimum bearing performancethe mating surface should be ground to

better than 0.4 µm Ra. This effect is acco-modated by the mating surface finish appli-cation factor aS shown in Fig. 18.

Fig. 18: DX application factor aS

Bearing environment temperature Tamb [°C]

0

0

0.2

0.4

10 20 30 40 50

0.8

0.6

1

Housings offering average to good heat dissipation

Housings made of light metal pressings

Non-metallic housings

60 70 80 90 100

App

lica

tion

fact

or a

T

Mating surface finish Ra [μm]

00

0.2

0.4

0.25 0.50

0.8

0.6

1

0.75 1.00 1.25

Ap

plic

atio

n fa

cto

r a

S

5 Design Factors

18

5.7 Bearing SizeFrictional heat generated at the bearingsurface and dissipated through the shaftand housing depends both on the operat-ing conditions (i.e. pv factor) and the bear-ing size.

For a give pv condition a large bearing willrun hotter than a smaller bearing. Thebearing size factor aB shown in Fig. 19takes account of this effect.

Fig. 19: Bearing size factor aB

Note: aB = 1 for slideways

5.8 Estimation of Bearing Service Life with Grease Lubrication

Calculation Parameters

Operating Conditions

Be

arin

g si

ze fa

ctor

aB

Journal diameter DJ [mm]

8

0.1

0.2

0.3

9 10

0.40.5

0.8

0.60.7

0.91.0

1.5

3.0

2.0

15 20 30 40 50 70 100 150 200 500

Bushes Thrust Washers Slide Plates Unit

Bearing diameter DiBearing outsidediameter

Do Strip Length L [mm]

Bearing width BBearing insidediameter

Di Strip Width W [mm]

Load F [N]

Rotational Speed (Continuous) n [1/min]

Oscillating Frequency nosc [1/min]

Angular movement about mean position ϕ [°]

Specific Load Limit see Table 5, Page 13 [MPa]

Application Factor aQ see Fig. 14-17, Page 16 [-]

Application Factor aT see Fig. 17, Page 17 [-]

Application Factor aS see Fig. 18, Page 17 [-]

Bearing Size Factor aB see Fig. 19, Page 18 [-]

5Design Factors

19

Calculate p from the equations in 5.1 on Page 13.

Calculate v from the equations in 5.2 on Page 14.

Calculate pv from the equation in 5.3 on Page 15.

Calculate High Load Factor aE

Note:

If aE >10000, or aE <0, the bearing is over-loaded.

Calculate Effective pv Factor epv

Note:

Check that epv is less than the limit for thesliding speed v set in Fig. 11. If NOT,

increase the bearing length or use continu-ous lubrication.

Estimate Bearing LifeIf epv < 1.0 then If epv > 1.0 then

Estimate Re-greasing Interval

Oscillating Motion and Dynamic LoadsOscillating Motion

Calculate number of cycles

Dynamic Loads

Calculate number of cycles

where R = Number of times bearing isregreased during total life required.

Check that ZT (or CT) is less than the totalnumber of cycles Q given in Fig. 9 foractual bearing specific load p.

If ZT (or CT) > Q then life will be limited byfatigue after Q cycles.

If ZT (or CT) < Q then life will be limited bywear after ZT cycles.

If the estimated life or total cycles areinsufficient or the regreasing intervals aretoo frequent, increase the bearing lengthor diameter, or consider drip feed or con-tinuous oil lubrication, the quantity to beestablished by test.

aEplim

plim p–----------------=

(5.8.1) [–]

plim see Table 5, Page 13

epvaE pv⋅

aB

---------------=

(5.8.2) [–]

LH3000epv------------- aQ aT aS⋅ ⋅ ⋅=

(5.8.3) [h]

LH3000

epv( )2.4------------------- aQ aT aS⋅ ⋅ ⋅=

(5.8.4) [h]

LRGLH

2------=

(5.8.5) [h]

ZT LRG nosc 60 R 2+( )⋅⋅ ⋅=

(5.8.6) [–]

CT LRG C 60 R 2+( )⋅⋅ ⋅=

(5.8.7) [–]

5 Design Factors

20

5.9 Worked Examples

PM cylindrical BushGivenLoad Details Steady Load Inside Diameter Di 40 mm

Direction: down Length B 30 mmShaft Steel Bearing Load F 15000 N

ambient Temperature Rotational Speed N 30 1/mingood heat conditions Ra 0.3 µm

Calculation Constants and Application FactorsSpecific Load Limit plim 70 MPa (Table 5, Page 13)Application Factor aT 1.0 (Fig. 17, Page 17)Mating Surface Application Factor aS 0.98 (Fig. 18, Page 17)Bearing Size Factor aB for ø 40 0.98 (Fig. 19, Page 18)Application Factor for PM bush aQ 1.8 (Fig. 15, Page 16)

Calculation Ref ValueSpecific Load p [MPa]

(5.1.1), page 13

Sliding Speed v [m/s]

(5.2.1), page 14

High Load FactoraE [-] (must be >0)

(5.8.1), page 19

epv Factor[-]

(5.8.3), page 19

LifeLH [h] for epv<1

(5.8.3), page 19

LRG [h](5.8.3), page 19

p FDi B⋅----------- 15000

40 30⋅---------------- 12.5= = =

vDi π n⋅ ⋅

60 103⋅------------------ 40 π 30⋅ ⋅

60000--------------------- 0.063= = =

aEplim

plim p–--------------- 70

70 12.5–---------------------- 1.22= = =

epvaE pv⋅

aB

-------------- 1.22 12.5 0.063⋅ ⋅0.98

------------------------------------------- 0.98== =

LH3000epv

------------- aQ aT aS⋅ ⋅ ⋅ 30000.98------------- 1.8⋅ 1.0 0.98⋅ ⋅ 5400= = =

LRGLH

2------ 5400

2------------- 2700= = =

PM cylindrical BushGivenLoad Details Steady Load Inside Diameter Di 90 mm

Direction: up Length B 60 mmShaft Steel Bearing Load F 45000 N

Temperature 80 °C Rotational Speed N 20 1/mingood heat conditions Ra 0.3 µm

Calculation Constants and Application FactorsSpecific Load Limit plim at 80 °C 46.7 MPa (Table 5, Page 13)Application Factor aT 0.4 (Fig. 17, Page 17)Mating Surface Application Factor aS 0.98 (Fig. 18, Page 17)Bearing Size Factor aB for ø 40 0.70 (Fig. 19, Page 18)Application Factor for PM bush aQ 1.0 (Fig. 15, Page 16)


(5.1.1), page 13


(5.2.1), page 14


(5.8.1), page 19

epv Factor[-]

(5.8.3), page 19


(5.8.3), page 19

LRG [h](5.8.3), page 19

p FDi B⋅----------- 45000

90 60⋅---------------- 8.33= = =

vDi π n⋅ ⋅

60 103⋅------------------ 90 π 20⋅ ⋅

60000--------------------- 0.094= = =

aEplim

plim p–--------------- 46.7

46.7 8.33–--------------------------- 1.22= = =

epvaE pv⋅

aB

-------------- 1.22 8.33 0.094⋅ ⋅0.70

------------------------------------------- 1.36== =

LH3000

epv( )2.4------------------- aQ aT aS⋅ ⋅ ⋅ 3000

1.362.4----------------- 1.0⋅ 0.4 0.98⋅ ⋅ 562= = =

LRGLH

2------ 562

2---------- 281== =

Thrust washerGivenLoad Details Steady Load Inside Diameter Di 26 mm

Direction: down Outside Diameter Do 44 mmShaft Steel Bearing Load F 10000 N

ambient Temperature Rotational Speed N 10 1/mingood heat conditions Ra 0.3 µm

Calculation Constants and Application FactorsSpecific Load Limit plim 70 MPa (Table 5, Page 13)Application Factor aT 1.0 (Fig. 17, Page 17)Mating Surface Application Factor aS 0.98 (Fig. 18, Page 17)Bearing Size Factor aB for ø 35 0.90 (Fig. 19, Page 18)Application Factor for Thrust washers aQ 1.0 (Fig. 16, Page 16)


(5.1.2), page 13


(5.2.2), page 14


(5.8.1), page 19

epv Factor[-]

(5.8.2), page 19


(5.8.3), page 19

LRG [h](5.8.3), page 19

p 4 F⋅π Do

2 Di2–( )⋅

------------------------------ 4 10000⋅π 442 262–( )⋅------------------------------- 10.11= = =

v

Do Di+2

---------------- π n⋅ ⋅

60 103⋅---------------------------

44 26+2

----------------- π 10⋅ ⋅

60 103⋅-------------------------------- 0.018= = =

aEplim

plim p–--------------- 70

70 10.11–------------------------- 1.169= = =

epvaE pv⋅

aB

-------------- 1.169 10.11 0.018⋅ ⋅0.90

------------------------------------------------- 0.236== =

LH3000epv

------------- aQ aT aS⋅ ⋅ ⋅ 30000.236--------------- 1.0⋅ 1.0 0.98⋅ ⋅ 12460= = =

LRGLH

2------ 12460

2---------------- 6230= = =

SlidewaysGivenLoad Details Steady Load Length L 50 mm

Direction: down Width W 20 mmMating Surface Steel (Ra = 0.3 µm) Bearing Load F 20000 N

Temperature 80 °C Stroke 15 mmgood heat conditions Frequency 10 1/min

Calculation Constants and Application FactorsSpecific Load Limit plim at 80 °C 93 MPa (Table 5, Page 13)Application Factor aT 0.4 (Fig. 17, Page 17)Mating Surface Application Factor aS 0.98 (Fig. 18, Page 17)Bearing Size Factor aB 1.0 (Fig. 19, Page 18)Application Factor for Slideways aQ 1.0 (Fig. 16, Page 16)


(5.1.3), page 13



(5.8.1), page 19

epv Factor[-]

(5.8.2), page 19


(5.8.3), page 19

LRG [h](5.8.3), page 19

p FL W⋅----------- 20000

50 20⋅---------------- 20= = =

v 15 2 10⋅ ⋅60 103⋅

--------------------- 0.005= =

aEplim

plim p–--------------- 93

93 20–----------------- 1.27= = =

epvaE pv⋅

aB

-------------- 1.27 20 0.005⋅ ⋅1.0

-------------------------------------- 0.127== =

LH3000epv

------------- aQ aT aS⋅ ⋅ ⋅ 30000.127--------------- 1.0⋅ 0.4 0.98⋅ ⋅ 9260= = =

LRGLH

2------ 9260

2------------- 4630= = =

6Bearing Assembly

21

6 Bearing Assembly

6.1 Dimensions and TolerancesFor optimum performance it is essentialthat the correct running clearance is usedand that both the diameter of the shaft andthe bore of the housing are finished to thelimits given in the tables.

If the bearing housing is unusually flexiblethe bush will not close in by the calculated

amount and the running clearance will bemore than the optimum. In these circum-stances the housing should be boredslightly undersize or the journal diameterincreased, the correct size being deter-mined by experiment.

6.2 Tolerances for minimum clearance

Grease lubricationThe minimum clearance required for satis-factory performance of DX depends uponthe pv factor, the sliding speed and theenvironmental temperature, any one orcombination of which may reduce thediametral clearance in operation due toinward thermal expansion of the DX poly-mer lining. It is therefore necessary tocompensate for this.

Fig. 20 shows the minimum diametralclearance plotted stepped against journaldiameter at an ambient 20 °C. Where thestepped lines show a change of clearancefor a given journal diameter, the lowervalue is used.

The superimposed straight lines indicatethe minimum permissible diametral clear-

ance for various values of pvu (Fig. 20),where pv is calculated as in 5.3 onPage 15, and u is a sliding speed factor forspeeds in excess of 0.5 m/s given inFig. 21.

If the clearance indicated for a pvu factorlies below the stepped lines the recom-mended standard shaft may be used. Ifabove, the shaft size must be reduced toobtain the clearance indicated on the verti-cal axis of the relevant figure.

Under slow speed and high load conditionsit may be possible to achieve satisfactoryperformance with diametral clearancesless than those indicated. But adequateprototype testing is recommended in suchcases.

6 Bearing Assembly

22

Fig. 20: Minimum clearance for PM prefinished and MB machinable metric range machined to H7 bore

Fig. 21: Rubbing speed factor u

Re

com

men

ded

min

imum

dia

me

tral

cle

aran

ce C

D [

mm

]

Journal diameter DJ [mm]

100.01

0.02

0.03

20 30 40 50 60 80 10070 90

0.04

0.05

0.06

0.08

0.1

0.15

0.2

PM range Use standard clear-ances unless fine run-ning required

Increase stand-ard clearances to level indicated by pvu line

MB range

2.8 MPa x m

/s

1.0

0.5

0.35

0.25

0.15

0.10

pvu

Rub

bing

spe

ed fa

ctor

u


0.5

1

2

0 0.5 1

1.5

0

1.5 2 2.5

6Bearing Assembly

23

Fluid Lubrication

The minimum clearance required for jour-nal bearings operating under hydrody-namic or mixed film conditions for a rangeof shaft rotational speeds and diameters is

shown in Fig. 22 It is recommended thatthe bearing performance under minimumclearance conditions be confirmed by test-ing if possible.

Fig. 22: DX minimum clearances - bush diameters Di 10-50 mm

Allowance for Thermal ExpansionFor operation in high temperature environ-ments the clearance should be increasedby the amounts indicated by Fig. 23 to

compensate for the inward thermal expan-sion of the bearing lining.

Fig. 23: Recommended increase in diametral clearance

If the housing is non-ferrous then the boreshould be reduced by the amounts given inTable 6, in order to give an increased inter-

ference fit to the bush, with a similar reduc-tion in the journal diameter additional tothat indicated by Fig. 23.

Dia

met

ral c

lear

ance

CD

[mm

]

Speed N [rev/min]

00.01

0.02

100

0.03

0.05

0.06

0.04

1000

Detail design required for rubbing speeds above 3 m/s

50 45 40 3530

2520

15

18

12

10

Incr

ease

in m

inim

um

dia

me

tra

l cle

ara

nce

[mm

]

Environmental temperature Tamb [°C]

0.01

0.02

0 40 60 80

0

20 100 120 140 160

0.03

0.04

0.05

6 Bearing Assembly

24

Table 6: Allowance for high temperature

6.3 Counterface DesignDX bearings may be used with all conven-tional mating surface materials. Hardeningof steel journals is not required unlessabrasive dirt is present or if the projectedbearing life is in excess of 2000 hours, inwhich cases a minimum shaft hardness of350 HB is recommended.

A ground surface finish of better than0.4 µm Ra is recommended. The finaldirection of machining of the mating sur-face should preferably be the same as thedirection of motion relative to the bearingin service.

DX is normally used in conjunction with fer-rous journals and thrust faces, but in dampor corrosive surroundings stainless steel orhard chromium plated mild steel, alterna-

tively WH shaft sleeves (Standard pro-gramm available) are recommended.When plated mating surfaces are specifiedthe plating should possess adequatestrength and adhesion, particularly if thebearing is to operate with high fluctuatingloads.

The shaft or thrust collar used in conjunc-tion with the DX bush or thrust washermust extend beyond the bearing surface inorder to avoid cutting into it. The matingsurface must also be free from grooves orflats, the end of the shaft should be given alead-in chamfer and all sharp edges orprojections which may damage the softpolymer lining of the DX must be removed.

Fig. 24: Counterface design

Housing materialReduction in housing

diameter per 100 °C riseReduction in shaft diameter

per 100 °C rise

Aluminium alloys 0.1% 0.1% + values from Fig. 23

Copper base alloys 0.05% 0.05% + values from Fig. 23

Steel and cast iron Nil values from Fig. 23

Zinc base alloys 0.15% 0.15% + values from Fig. 23

incorrect correct

6Bearing Assembly

25

6.4 InstallationImportant Note

Care must be taken to ensure that the DXlining material is not damaged during theinstallation.

Fitting of BushesThe bush is inserted into its housing withthe aid of a stepped mandrel, preferablymade from case hardened mild steel, asshown in Fig. 25. The following should benoted to avoid damage to the bearing:

• Housing diameter is as recommended

• 15-30° lead-in chamfer on housing

• edges of lead-in chamfer are deburred

• The bush must be square to the housing

• Light smear of oil on bush OD

Fig. 25: Fitting of bushes

Insertion ForcesFig. 26 gives an indication of the maximuminsertion force required to correctly installstandard DX bushes.

Fig. 26: Maximum insertion force Fi

Do <55 mm Do >55 mm Do >120 mm

15°-30°

Mounting Ring

Note:Lightly oil back of bush to assist assembly.

for

DH

≤1

25

= 0

.8fo

r D

H >

12

5 =

2

for

DH

≤1

25 =

0.

8

DiDi

DH

DH

Max

imum

inse

rtio

n fo

rce

[N/m

m u

nit

len

gth

]

Bush bore diameter Di [mm]

200

400

1000

0 30 40 50

800

0

20 100

600

10

6 Bearing Assembly

26

Alignment

Accurate alignment is an important consid-eration for all bearing assemblies. With DXbearings misalignment over the length of a

bush (or pair of bushes), or over the diam-eter of a thrust washer should not exceed0.020 mm as illustrated in Fig. 27.

Fig. 27: Alignment

SealingWhile DX can tolerate the ingress of somecontaminant materials into the bearingwithout loss of performance, where there isthe possibility of highly abrasive material

entering the bearing, a suitable sealingarrangement, as illustrated in Fig. 28should be provided.

Fig. 28: Recommended sealing arrangements

Axial LocationWhere axial location is necessary, it is gen-erally advisable to fit DX thrust washers inconjunction with DX bushes, even whenthe axial loads are low. Experience has

shown that fretting debris from unsatisfac-tory locating surfaces can enter an adja-cent DX bush and adversely affect thebearing life and performance.

Fitting of Thrust WashersDX thrust washers should be located onthe outside diameter in a recess as shownin Fig. 29. The inside diameter must beclear of the shaft in order to prevent con-tact with the steel backing of the DX mate-rial. The recess diameter should be 0.125mm larger than the washer diameter andthe depth as given in the product tables.

If there is no recess for the thrust washerone of the following methods of fixing maybe used:

• two dowel pins

• two screws

• adhesive.

6Bearing Assembly

27

Fig. 29: Installation of Thrust-Washer

Important Note• Dowel pins should be recessed 0.25 mm

below the bearing surface

• Screws should be countersunk 0.25 mmbelow the bearing surface

• DX must not be heated above 130 °C

• Contact adhesive manufacturers forguidance on the selection of suitableadhesives

• Protect the bearing surface to preventcontact with adhesive

• Ensure the washer ID does not touch theshaft after assembly

• Ensure that the washer is mounted withthe steel backing to the housing.

SlidewaysDX strip material for use as slideway bear-ings should be installed using one of thefollowing methods:

• countersunk screws

• adhesives

• mechanical location.

Fig. 30: Mechanical location of DX slideways

7 Machining

28

7 Machining

7.1 Machining PracticeThe acetal copolymer lining of DX hasgood machining characteristics and can betreated as a free cutting brass in mostrespects. The indents in the bearing sur-face may lead to the formation of burrs orwhiskers due to the resilience of the liningmaterial, but this can be avoided by usingmachining methods which remove the lin-ing as a ribbon, rather than a narrowthread.

When machining DX it is recommendedthat not more than 0.125 mm is removedfrom the lining thickness in order to ensurethat the lubricant capacity of the indentsremaining after machining is not signifi-cantly reduced.

Boring, reaming and broaching are all suit-able machining methods for use with DX.The recommended tool material is highspeed steel or tungsten carbide.

7.2 BoringFig. 31 illustrates a recommended boringtool which should be mounted with its axisat right angles to the direction of feed.

The essential characteristic required in theboring tool is a tip radius greater than 1.5mm, which combined with a side rake of30° will produce the ribbon effect required.

Cutting speeds should be high, the opti-mum between 2.0 and 4.5 m/s. The feedshould be low, in the range 0.05/0.025 mmfor cuts of 0.125 mm, the lower feedsbeing used with the higher cutting speeds.

Satisfactory finishes can usually beobtained machining dry and an air blastmay facilitate swarfe removal. The use ofcoolant is not detrimental.

Fig. 31: Boring tool for DX

12°

setting flat

Centre line through tip of tool to be on horizontal plane through centre of work piece

Section “AA“

20°

A

30°Dia to suit holder

0.75 mm x 3°

2.5 mm rad

A

Tungsten carbide tip “H“ or “N“ wickmen or equivalent 1.5 mm thick

25°

0.75 mm x 3°

7Machining

29

7.3 ReamingMB-DX-bushes can be reamed satisfacto-rily by hand with a straight-fluted expand-ing reamer. For best results the reamershould be sharp, the cut 0.025-0.050 mm

and the feed slow. Where hand reaming isnot desired machining speeds of about0.05 m/s are recommended with the cutsand feeds as for boring.

7.4 BroachingFig. 32 shows broaches suitable for finish-ing MB-DX-bushes up to 65 mm diameter.

The broach should be used dry, at a speedof 0.1-0.5 m/s.

Fig. 32: Suitable broaches for MB-DX

Use the single tooth version where thebush is less than 25 mm long, and the dou-ble tooth broach for longer bushes or fortwo or more bushes together.

Bush Width Pitch

BP

Over To

10 13 3

13 20 4

20 30 5

30 50 5.5

50 70 6

70 95 7

95 130 8

Diameter

Á´ Min. ass. bore+0.013+0.000

´B´ Nominal bore+0.038+0.025

Ć´ Nominal bore+0.015+0.005

Min. ass. bore = Do min - 2 x s3 max

Nominal bore = min. finished bore

´B1´* Nominal bore-0.065-0.076

Min. length of Pilot Guide

Lmin

Single bush B + 6

2 or morebushes in

line

B + 6 +bush spacing

5°

6 mm

3 mm rad polished1.5 mm rad

1.5 mm

2LL

Á´dia´B1´dia´B´dia´Ć´dia

C dia - 3 mm

0.75 mm x 45°1.5 mm rad

2LL

´B´diaĆ´dia Á´dia

Pitch P0.75 mm rad

1.5 mm

5°

45° 45°

2°

0.75 mm land

1.5 mm1.5 mm rad polished

Alternative - single tooth cutter

Detail of tooth form

Double tooth cutter

* First tooth of double tooth cutter

7 Machining

30

If it is necessary to make up a special formof broach the following points should benoted:• Adequate provision should be made for

locating the bush by providing a pilot tosuit the bore of the bush when pressedhome. A rear support shoulder shouldlocate in the broached bore of the bushafter cutting. Alternatively, special guidesmay be provided external to theworkpiece.

• If two bushes are to be broached in line,then the pilot guide and rear supportshould be longer than the distance bet-ween the two bushes.

• For large bushes it may be necessary toprovide axial relief along the length ofthe pilot guide and rear support, in orderto reduce the broaching forces.

• Unless a guided broach is used, the toolwill follow the initial bore alignment of thebush, broaching cannot improve concen-tricity and parallelism unless externalguides are used.

In general owing to the variation in wallthickness of large diameter bushes,broaching is not suitable for finishing bores

of more than 60 mm diameter unless exter-nal guides are used.

7.5 VibrobroachingThis technique may also be used. A singlecutter is propelled with progressive recipro-cating motion with a vibration frequency oftypically 50 Hz. The cutter should have aprimary rake of 1.5° for 0.5 mm. A cut of

0.25 mm on diameter may be made at anaverage cutting speed of 0.15 m/s to givea surface finish of better than 0.8 µm Ra,which is acceptable.

7.6 Modification of componentsThe modification of DX bearing compo-nents requires no special procedures. Ingeneral it is more satisfactory to performmachining or drilling operations from thepolymer lining side in order to avoid burrs.When cutting is done from the steel side,

the minimum cutting pressure should beused and care taken to ensure that anysteel or bronze particles protruding into theremaining bearing material, and all burrs,are removed.

7.7 Drilling Oil HolesBushes should be adequately supportedduring the drilling operation to ensure that

no distortion is caused by the drilling pres-sure.

7.8 Cutting Strip MaterialDX strip material may be cut to size by anyone of the following methods. Care mustbe taken to protect the bearing surfacefrom damage and to ensure that no defor-mation of the strip occurs.

• Using side and face cutter, or slittingsaw, with the strip held flat and securelyon a horizontal milling machine.

• Cropping

• Guillotine (For widths less than 90 mmonly)

• Water-jet cutting, Laser cutting

7Machining

31

7.9 Electroplating

DX ComponentsTo provide corrosion protection the mildsteel backing of DX may be electroplatedwith most of the conventional electroplat-ing metals including the following:

• zinc ISO 2081-2

• cadmium ISO 2081-2

• nickel ISO 1456-8

• hard chromium ISO 1456-8.

For the harder materials if the specifiedplating thickness exceeds approximately5 µm then the housing diameter should beincreased by twice the plating thickness inorder to maintain the correct assembledbearing bore size.

Where electrolytic attack is possible testsshould be conducted to ensure that all thematerials in the bearing environment aremutually compatible.

Mating SurfacesDX can be used against hard chromeplated materials and care should be takento ensure that the recommended shaft

sizes and surface finish are achieved afterthe plating process.

8 Standard Products

32

8 Standard Products

8.1 PM-DX cylindrical bushes

All dimensions in mm

(Di,a

)

dL

Ci

0.3

min

.

DoDi

s 3

20° ± 8°Co

Z

120°

B

Dimensions and tolerances follow ISO 3547 and GGB-Specifications

Detail Z

Split

Part No.

NominalDiameter

Wallthickness

s3

WidthB

Shaft-øDJ [h8]

Housing-øDH [H7]

Bush-ø Di,a

Ass. in H7 housing

ClearanceCD Oil hole-ø

dL

Di Domax.min.

max.min.

max.min.

max.min.

max.min.

max.min.

PM0808DX

8 10

0.9800.955

8.257.75

h8

8.0007.978

H7

10.01510.000

8.1058.040

0.1270.040

No holePM0810DX10.259.75

PM0812DX12.2511.75

PM1010DX

10 12

10.259.75

10.0009.978

12.01812.000

10.10810.040

0.1300.040

3

PM1012DX12.2511.75

4PM1015DX15.2514.75

PM1020DX20.2519.75

PM1210DX

12 14

10.259.75

12.00011.973

14.01814.000

12.10812.040

0.1350.040

3

PM1212DX12.2511.75

4

PM1215DX15.2514.75

PM1220DX20.2519.75

PM1225DX25.2524.75

PM1415DX

14 16

15.2514.75

14.00013.973

16.01816.000

14.10814.040

PM1420DX20.2519.75

PM1425DX25.2524.75

PM1508DX15 17

8.257.75 15.000

14.97317.01817.000

15.10815.040

3PM1510DX

10.259.75

For stock availability please contact your local sales representative

Outside Co and Inside Ci chamfers

a = Chamfer Co machined or rolled at the opinion of the manufacturer

b = Ci can be a radius or a chamfer in accordance with ISO 13715

Wall thickness s3

Co (a)Ci (b)

machined rolled

0.75 0.5 ± 0.3 0.5 ± 0.3 -0.1 to -0.4

1 0.6 ± 0.4 0.6 ± 0.4 -0.1 to -0.5

1.5 0.6 ± 0.4 0.6 ± 0.4 -0.1 to -0.7

Wall thickness s3

Co (a)Ci (b)

machined rolled

2 1.2 ± 0.4 1.0 ± 0.4 -0.1 to -0.7

2.5 1.8 ± 0.6 1.2 ± 0.4 -0.2 to -1.0

8Standard Products

33

PM1512DX

15 17

0.9800.955

12.2511.75

h8

15.00014.973

H7

17.01817.000

15.10815.040

0.1350.040

4

PM1515DX15.2514.75

PM1520DX20.2519.75

PM1525DX25.2524.75

PM1615DX

16 18

15.2514.75

16.00015.973

18.01818.000

16.10816.040

PM1620DX20.2519.75

PM1625DX25.2524.75

PM1815DX

18 20

15.2514.75

18.00017.973

20.02120.000

18.11118.040

PM1820DX20.2519.75

PM1825DX25.2524.75

PM2010DX

20 23

1.4751.445

10.259.75

20.00019.967

23.02123.000

20.13120.050

0.1640.050

PM2015DX15.2514.75

PM2020DX20.2519.75

PM2025DX25.2524.75

PM2030DX30.2529.75

PM2215DX

22 25

15.2514.75

22.00021.967

25.02125.000

22.13122.050

6

PM2220DX20.2519.75

PM2225DX25.2524.75

PM2230DX30.2529.75

PM2415DX

24 27

15.2514.75

24.00023.967

27.02127.000

24.13124.050

PM2420DX20.2519.75

PM2425DX25.2524.75

PM2430DX30.2529.75

PM2515DX

25 28

15.2514.75

25.00024.967

28.02128.000

25.13125.050

PM2520DX20.2519.75

PM2525DX25.2524.75

PM2530DX30.2529.75

PM283130DX

28

3130.2529.75

28.00027.967

31.02531.000

28.13528.050

0.1680.050

PM2820DX

32

1.9701.935

20.2519.75

32.02532.000

28.15528.060

0.1880.060

PM2825DX25.2524.75

PM2830DX30.2529.75

PM3020DX

30 34

20.2519.75

30.00029.967

34.02534.000

30.15530.060

PM3025DX25.2524.75

PM3030DX30.2529.75

PM3040DX40.2539.75

Part No.

NominalDiameter

Wallthickness

s3

WidthB

Shaft-øDJ [h8]

Housing-øDH [H7]

Bush-ø Di,a

Ass. in H7 housing


dL

Di Domax.min.

max.min.

max.min.

max.min.

max.min.

max.min.


8 Standard Products

34

PM3220DX

32 36

1.9701.935

20.2519.75

h8

32.00031.961

H7

36.02536.000

32.15532.060

0.1940.060

6

PM3230DX30.2529.75

PM3235DX35.2534.75

PM3240DX40.2539.75

PM3520DX

35 39

20.2519.75

35.00034.961

39.02539.000

35.15535.060

PM3530DX30.2529.75

PM3535DX35.2534.75

PM3540DX40.2539.75

PM3550DX50.2549.75

PM3635DX 36 4035.2534.75

36.00035.961

40.02540.000

36.15536.060

PM3720DX 37 4120.2519.75

37.00036.961

41.02541.000

37.15537.060

PM4020DX

40 44

20.2519.75

40.00039.961

44.02544.000

40.15540.060

8

PM4030DX30.2529.75

PM4040DX40.2539.75

PM4050DX50.2549.75

PM4520DX

45 50

2.4602.415

20.2519.75

45.00044.961

50.02550.000

45.19545.080

0.2340.080

PM4525DX25.2524.75

PM4530DX30.2529.75

PM4540DX40.2539.75

PM4545DX45.2544.75

PM4550DX50.2549.75

PM5030DX

50 55

30.2529.75

50.00049.961

55.03055.000

50.20050.080

0.2390.080

PM5040DX40.2539.75

PM5045DX45.2544.75

PM5050DX50.2549.75

PM5060DX60.2559.75

PM5520DX

55 60

20.2519.75

55.00054.954

60.03060.000

55.20055.080

0.2460.080

PM5525DX25.2524.75

PM5530DX30.2529.75

PM5540DX40.2539.75

PM5550DX50.2549.75

PM5560DX60.2559.75

Part No.

NominalDiameter

Wallthickness

s3

WidthB

Shaft-øDJ [h8]

Housing-øDH [H7]

Bush-ø Di,a

Ass. in H7 housing


dL

Di Domax.min.

max.min.

max.min.

max.min.

max.min.

max.min.


8Standard Products

35

PM6030DX

60 652.4602.415

30.2529.75

h8

60.00059.954

H7

65.03065.000

60.20060.080

0.2460.080

8

PM6040DX40.2539.75

PM6050DX50.2549.75

PM6060DX60.2559.75

PM6070DX70.2569.75

PM6530DX

65 70

2.4502.384

30.2529.75

65.00064.954

70.03070.000

65.26265.100

0.3080.100

PM6540DX40.2539.75

PM6550DX50.2549.75

PM6560DX60.2559.75

PM6570DX70.2569.75

PM7030DX

70 75

30.2529.75

70.00069.954

75.03075.000

70.26270.100

PM7040DX 40.2539.75

PM7045DX45.2544.75

PM7050DX50.2549.75

PM7060DX60.2559.75

PM7065DX65.2564.75

PM7070DX70.2569.75

PM7080DX80.2579.75

PM7540DX

75 80

40.2539.75

75.00074.954

80.03080.000

75.26275.100

9.5

PM7560DX60.2559.75

PM7580DX80.2579.75

PM8040DX

80 85

40.5039.50

80.00079.954

85.03585.000

80.26780.100

0.3130.100

PM8050DX50.5049.50

PM8060DX60.5059.50

PM8080DX80.5079.50

PM80100DX100.5099.50

PM8530DX

85 90

30.5029.50

85.00084.946

90.03590.000

85.26785.100

0.3210.100

PM8540DX40.5039.50

PM8560DX60.5059.50

PM8580DX80.5079.50

PM85100DX100.5099.50

Part No.

NominalDiameter

Wallthickness

s3

WidthB

Shaft-øDJ [h8]

Housing-øDH [H7]

Bush-ø Di,a

Ass. in H7 housing


dL

Di Domax.min.

max.min.

max.min.

max.min.

max.min.

max.min.


8 Standard Products

36

PM9040DX

90 95

2.4502.384

40.5039.50

h8

90.00089.946

H7

95.03595.000

90.26790.100

0.3210.100

9.5

PM9060DX60.5059.50

PM9080DX80.5079.50

PM9090DX90.5089.50

PM90100DX100.5099.50

PM9560DX95 100

60.5059.50 95.000

94.946100.035100.000

95.26795.100

PM95100DX100.5099.50

PM10040DX

100 105

40.5059.50

100.00099.946

105.035105.000

100.267100.100

PM10050DX50.5049.50

PM10060DX60.5059.50

PM10080DX80.5079.50

PM10095DX95.5094.50

PM100115DX115.50114.50

PM10560DX

105 110

60.5059.50

105.000104.946

110.035110.000

105.267105.100

PM10565DX65.5064.50

PM105110DX110.50109.50

PM105115DX115.50114.50

PM11050DX

110 115

50.5049.50

110.267110.100

115.035115.000

110.267105.100

PM11060DX60.5059.50

PM110100DX100.5099.50

PM110110DX110.50109.50

PM110115DX115.50114.50

PM11550DX115 120

50.5049.50 115.000

114.946120.035120.000

115.267115.100

PM11570DX70.5069.95

PM12060DX

120 125

2.4352.380

60.5059.50

120.000119.946

125.040125.000

120.280120.130

0.3340.130

PM120100DX100.5099.50

PM120110DX110.50109.50

PM12560DX

125 130

60.5059.50

125.000124.937

130.040130.000

125.280125.130

0.3430.130

PM125100DX100.5099.50

PM125110DX110.50109.50

PM13050DX

130 135

50.5049.50

130.000129.937

135.040135.000

130.280130.130

No holePM13060DX

60.5059.50

PM13080DX80.5079.50

PM130100DX100.5099.50

Part No.

NominalDiameter

Wallthickness

s3

WidthB

Shaft-øDJ [h8]

Housing-øDH [H7]

Bush-ø Di,a

Ass. in H7 housing


dL

Di Domax.min.

max.min.

max.min.

max.min.

max.min.

max.min.


8Standard Products

37

PM13560DX135 140

2.4352.380

60.5059.50

h8

135.000134.937

H7

140.040140.000

135.280135.130

0.3430.130

No hole

PM13580DX80.5079.50

PM14050DX

140 145

50.5049.50

140.000139.937

145.040145.000

140.280140.130

PM14060DX60.5059.50

PM14080DX80.5079.50

PM140100DX100.5099.50

PM15050DX

150 155

50.5049.50

150.000149.937

155.040155.000

150.280150.130

PM15060DX60.5059.50

PM15080DX80.5079.50

PM150100DX100.5099.50

PM16050DX

160 165

50.5049.50

160.000159.937

165.040165.000

160.280160.130

PM16060DX60.5059.50

PM16080DX80.5079.50

PM160100DX100.5099.50

PM17050DX

170 175

50.5049.50

170.000169.937

175.040175.000

170.280170.130

PM17060DX60.5059.50

PM17080DX80.5079.50

PM170100DX100.5099.50

PM18050DX

180 185

50.5049.50

180.000179.937

185.046185.000

180.286180.130

0.3490.130

PM18060DX60.5059.50

PM18080DX80.5079.50

PM180100DX100.5099.50

PM19050DX

190 195

50.5049.50

190.000189.928

195.046195.000

190.286190.130

0.3580.130

PM19060DX60.5059.50

PM19080DX80.5079.50

PM190100DX100.5099.50

PM190120DX120.50119.50

PM20050DX

200 205

50.5049.50

200.000199.928

205.046205.000

200.286200.130

PM20060DX60.5059.50

PM20080DX80.5079.50

PM200100DX100.5099.50

PM200120DX120.50119.50

Part No.

NominalDiameter

Wallthickness

s3

WidthB

Shaft-øDJ [h8]

Housing-øDH [H7]

Bush-ø Di,a

Ass. in H7 housing


dL

Di Domax.min.

max.min.

max.min.

max.min.

max.min.

max.min.


8 Standard Products

38

PM22050DX

220 225

2.4352.380

50.5049.50

h8

220.000219.928

H7

225.046225.000

220.286220.130

0.3580.130

No hole

PM22060DX60.5059.50

PM22080DX80.5079.50

PM220100DX100.5099.50

PM220120DX120.50119.50

PM24050DX

240 245

50.5049.50

240.000239.928

245.046245.000

240.286240.130

PM24060DX60.5059.50

PM24080DX80.5079.50

PM240100DX100.5099.50

PM240120DX120.50119.50

PM25050DX

250 255

50.5049.50

250.000249.928

255.052255.000

250.292250.130

0.3640.130

PM25060DX60.5059.50

PM25080DX80.5079.50

PM250100DX100.5099.50

PM250120DX120.50119.50

PM26050DX

260 265

50.5049.50

260.000259.919

265.052265.000

260.292260.130

0.3730.130

PM26060DX60.5059.50

PM26080DX80.5079.50

PM260100DX100.5099.50

PM260120DX120.50119.50

PM28050DX

280 285

50.5049.50

280.000279.919

285.052285.000

280.292280.130

PM28060DX60.5059.50

PM28080DX80.5079.50

PM280100DX100.5099.50

PM280120DX120.50119.50

PM30050DX

300 305

50.5049.50

300.000299.919

305.052305.000

300.292300.130

PM30060DX60.5059.50

PM30080DX80.5079.50

PM300100DX100.5099.50

PM300120DX120.50119.50

Part No.

NominalDiameter

Wallthickness

s3

WidthB

Shaft-øDJ [h8]

Housing-øDH [H7]

Bush-ø Di,a

Ass. in H7 housing


dL

Di Domax.min.

max.min.

max.min.

max.min.

max.min.

max.min.


8Standard Products

39

8.2 MB-DX cylindrical bushes


* recommended machining depth see page 28

(Di,a

,m)

dL

Ci

0.3

min

.

DoDi

s 3

20° ± 8°Co

Z

120°

B

Dimensions and tolerances follow ISO 3547 and GGB-Specifications

Detail Z

Split

Outside Co and Inside Ci chamfers

a = Chamfer Co machined or rolled at the opinion of the manufacturer

b = Ci can be a radius or a chamfer in accordance with ISO 13715

Wall thickness s3

Co (a)Ci (b)

machined rolled

0.75 0.5 ± 0.3 0.5 ± 0.3 -0.1 to -0.4

1 0.6 ± 0.4 0.6 ± 0.4 -0.1 to -0.5

1.5 0.6 ± 0.4 0.6 ± 0.4 -0.1 to -0.7

Wall thickness s3

Co (a)Ci (b)

machined rolled

2 1.2 ± 0.4 1.0 ± 0.4 -0.1 to -0.7

2.5 1.8 ± 0.6 1.2 ± 0.4 -0.2 to -1.0

Part No.

NominalDiameter

Wall thickness

s3

WidthB

Shaft-∅DJm [d8]

Housing−∅DH [H7]

Bush-∅ Di,a,m

Ass. in H7 housing*

ClearanceCDm Oil hole-ø

dLDi Do

max.min.

max.min.

max.min.

max.min.

max.min.

max.min.

MB0808DX

8 10

1.1081.082

8.257.75

d8

7.9607.938

H7

10.01510.000

8.0158.000

0.0770.040

No holeMB0810DX10.259.75

MB0812DX12.2511.75

MB1010DX

10 12

10.259.75

9.9609.938

12.01812.000

10.01810.000

0.0800.040

3

MB1012DX12.2511.75

4MB1015DX15.2514.75

MB1020DX20.2519.75

MB1210DX

12 14

10.259.75

11.95011.923

14.01814.000

12.01812.000

0.0950.050

3

MB1212DX12.2511.75

4

MB1215DX15.2514.75

MB1220DX20.2519.75

MB1225DX25.2524.75

MB1415DX

14 16

15.2514.75

13.95013.923

16.01816.000

14.01814.000

MB1420DX20.2519.75

MB1425DX25.2524.75

MB1510DX

15 17

10.259.75

14.95014.923

17.01817.000

15.01815.000

3

MB1512DX12.2511.75

4MB1515DX15.2514.75

MB1525DX25.2524.75


8 Standard Products

40

MB1615DX

16 18

1.1081.082

15.2514.75

d8

15.95015.923

H7

18.01818.000

16.01816.000

0.0950.050

4

MB1620DX20.2519.75

MB1625DX25.2524.75

MB1815DX

18 20

15.2514.75

17.95017.923

20.02120.000

18.01818.000

MB1820DX20.2519.75

MB1825DX25.2524.75

MB2010DX

20 23

1.6081.576

10.259.75

19.93519.902

23.02123.000

20.02120.000

0.1190.065

MB2015DX15.2514.75

MB2020DX20.2519.75

MB2025DX25.2524.75

MB2030DX30.2529.75

MB2215DX

22 25

15.2514.75

21.93521.902

25.02125.000

22.02122.000

6

MB2220DX20.2519.75

MB2225DX25.2524.75

MB2230DX30.2529.75

MB2415DX

24 27

15.2514.75

23.93523.902

27.02127.000

24.02124.000

MB2420DX20.2519.75

MB2425DX25.2524.75

MB2430DX30.2529.75

MB2515DX

25 28

15.2514.75

24.93524.902

28.02128.000

25.02125.000

MB2520DX20.2519.75

MB2525DX25.2524.75

MB2530DX30.2529.75

MB2820DX

28 32

2.1082.072

20.2519.75

27.93527.902

32.02532.000

28.02128.000

MB2825DX25.2524.75

MB2830DX30.2529.75

MB3020DX

30 34

20.2519.75

29.93529.902

34.02534.000

30.02130.000

MB3030DX30.2529.75

MB3040DX40.2539.75

Part No.

NominalDiameter

Wall thickness

s3

WidthB

Shaft-∅DJm [d8]


Bush-∅ Di,a,m

Ass. in H7 housing*


dLDi Do

max.min.

max.min.

max.min.

max.min.

max.min.

max.min.


8Standard Products

41

MB3220DX

32 36

2.1082.072

20.2519.75

d8

31.92031.881

H7

36.02536.000

32.02532.000

0.1440.080

6

MB3230DX30.2529.75

MB3235DX35.2534.75

MB3240DX40.2539.75

MB3520DX

35 39

20.2519.75

34.92034.881

39.02539.000

35.02535.000

MB3530DX30.2529.75

MB3550DX50.2549.75

MB3720DX 37 4120.2519.75

36.92036.881

41.02541.000

37.02537.000

MB4020DX

40 44

20.2519.75

39.92039.881

44.02544.000

40.02540.000

8

MB4030DX30.2529.75

MB4040DX40.2539.75

MB4050DX50.2549.75

MB4520DX

45 50

2.6342.588

20.2519.75

44.92044.881

50.02550.000

45.02545.000

MB4530DX30.2529.75

MB4540DX40.2539.75

MB4545DX45.2544.75

MB4550DX50.2549.75

MB5040DX50 55

40.2539.75 49.920

49.88155.03055.000

50.02550.000

MB5060DX60.2559.75

MB5520DX

55 60

20.2519.75

54.90054.854

60.03060.000

55.03055.000

0.1760.100

MB5525DX25.2524.75

MB5530DX30.2529.75

MB5540DX40.2539.75

MB5550DX50.2549.75

MB5560DX60.2559.75

MB6030DX

60 65

30.2529.75

59.90059.854

65.03065.000

60.03060.000

MB6040DX40.2539.75

MB6060DX60.2559.75

MB6070DX70.2569.75

Part No.

NominalDiameter

Wall thickness

s3

WidthB

Shaft-∅DJm [d8]


Bush-∅ Di,a,m

Ass. in H7 housing*


dLDi Do

max.min.

max.min.

max.min.

max.min.

max.min.

max.min.


8 Standard Products

42

MB6540DX

65 70

2.6342.568

40.2539.75

d8

64.90064.854

H7

70.03070.000

65.03065.000

0.1760.100

8

MB6550DX50.2549.75

MB6560DX60.2559.75

MB6570DX70.2569.75

MB7040DX

70 75

40.2539.75

69.90069.854

75.03075.000

70.03070.000

MB7050DX50.2549.75

MB7065DX65.2564.75

MB7070DX70.2569.75

MB7080DX80.2579.75

MB7540DX

75 80

40.2539.75

74.90074.854

80.03080.000

75.03075.000

9.5

MB7560DX60.2559.75

MB7580DX80.2579.75

MB8040DX

80 85

40.5039.50

79.90079.854

85.03585.000

80.03080.000

MB8060DX60.5059.50

MB8080DX80.5079.50

MB80100DX100.5099.50

MB8530DX

85 90

30.5029.50

84.88084.826

90.03590.000

85.03585.000

0.2090.120

MB8540DX40.5039.50

MB8560DX60.5059.50

MB8580DX80.5079.50

MB85100DX100.5099.50

MB9040DX

90 95

40.5039.50

89.88089.826

95.03595.000

90.03590.000

MB9060DX60.5059.50

MB9090DX90.5089.50

MB90100DX100.5099.50

MB9560DX95 100

60.5059.50 94.880

94.826100.035100.000

95.03595.000

MB95100DX100.5099.50

MB10050DX

100 105

50.5049.50

99.88099.826

105.035105.000

100.035100.000

MB10060DX60.5059.50

MB10080DX80.5079.50

MB10095DX95.5094.50

MB100115DX115.50114.50

Part No.

NominalDiameter

Wall thickness

s3

WidthB

Shaft-∅DJm [d8]


Bush-∅ Di,a,m

Ass. in H7 housing*


dLDi Do

max.min.

max.min.

max.min.

max.min.

max.min.

max.min.


8Standard Products

43

MB10560DX

105 110

2.6342.568

60.5059.50

d8

104.880104.826

H7

110.035110.000

105.035105.000

0.2090.120

9.5

MB105110DX110.50109.50

MB105115DX115.50114.50

MB11060DX110 115

60.5059.50 109.880

109.826115.035115.000

110.035110.000

MB110115DX115.50114.50

MB11550DX115 120

50.5049.50 114.880

114.826120.035120.000

115.035115.000

MB11570DX70.5069.50

MB12060DX120 125

2.6192.564

60.5059.50 119.880

119.826125.040125.000

120.035120.000

MB120100DX100.5099.50

MB125100DX 125 130100.5099.50

124.855124.792

130.040130.000

125.040125.000

0.2480.145

MB13050DX

130 135

50.5049.50

129.855129.792

135.040135.000

130.040130.000

No hole

MB13060DX60.5059.50

MB130100DX100.5099.50

MB13560DX135 140

60.5059.50 134.855

134.792140.040140.000

135.040135.000

MB13580DX80.5079.50

MB14060DX140 145

60.5059.50 139.855

139.792145.040145.000

140.040140.000

MB140100DX100.5099.50

MB15060DX

150 155

60.5059.50

149.855149.792

155.040155.000

150.040150.000

MB15080DX80.5079.50

MB150100DX100.5099.50

Part No.

NominalDiameter

Wall thickness

s3

WidthB

Shaft-∅DJm [d8]


Bush-∅ Di,a,m

Ass. in H7 housing*


dLDi Do

max.min.

max.min.

max.min.

max.min.

max.min.

max.min.


8 Standard Products

44

8.3 DX Thrust Washers


dP

Di

Do

sT

Ha

Do

d p

dD

Hd

[D10

]

DJ

Part No.

Inside-øDi

Outside-øDo

ThicknesssT

Dowel hole Recess depthHaø dD PCD-ø dp

max.min.

max.min.

max.min.

max.min.

max.min.

max.min.

WC08DX10.2510.00

20.0019.75

1.581.49

No hole No hole

1.200.95

WC10DX12.2512.00

24.0023.75

1.8751.625

18.1217.88

WC12DX14.2514.00

26.0025.75

2.3752.125

20.1219.88

WC14DX16.2516.00

30.0029.75

22.1221.88

WC16DX18.2518.00

32.0031.75

25.1224.88

WC18DX20.2520.00

36.0035.75

3.3753.125

28.1227.88

WC20DX22.2522.00

38.0037.75

30.1229.88

WC22DX24.2524.00

42.0041.75

33.1232.88

WC24DX26.2526.00

44.0043.75

35.1234.88

WC25DX 28.2528.00

48.0047.75

4.3754.125

38.1237.88

WC30DX32.2532.00

54.0053.75

43.1242.88

WC35DX38.2538.00

62.0061.75

50.1249.88

WC40DX42.2542.00

66.0065.75

54.1253.88

WC45DX48.2548.00

74.0073.75

2.602.51

61.1260.88

1.701.45

WC50DX52.2552.00

78.0077.75

65.1264.88

WC60DX62.2562.00

90.0089.75

76.1275.88


8Standard Products

45

8.4 DX cylindrical bushes - Inch sizes

All dimensions in inch

(Di,a

/ D

i,am

)

dL

0.01

2 m

in.

B

DoDi

s 3

0.01520°± 8°

Z

120

25°-50°

0.0050.030

Detail Z

Split

Part No.

NominalDiameter

Housing-ø DH

[BS 1916 H7]

As supplied Machined in situ

Oil hole-ø

dL

WallThickness

s3

WidthB

Shaft-ø DJ

Bush-ø Di,a

Ass. in an H7

housing

ClearanceCD

Shaft-øDJm

[BS 1916 d8]

Bush-ø Di,am Machined in

situ to BS 1916 H7

Clearance CDm

Di Domax.min.

max.min.

max.min.

max. min.

max.min.

max.min.

max.min.

max.min.

max.min.

06DX06

3/815/32

0.46940.4687

0.05100.0500

0.3850.365

0.36480.3639

0.36940.3667

0.00550.0019

0.37340.3725

0.37560.3750

0.00310.0016

No hole

06DX080.5100.490

5/32

06DX120.7600.740

07DX08 7/16

17/320.53190.5312

0.5100.490 0.4273

0.42630.43190.4292

0.00560.0019

0.43550.4345

0.43820.4375

0.00370.0020

07DX120.7600.740

08DX06

1/219/32

0.59440.5937

0.3850.365

0.48970.4887

0.49440.4917

0.00570.0020

0.49800.4970

0.50070.5000

08DX080.5100.490

08DX100.6350.615

08DX140.8850.865

09DX08 9/16

21/320.65690.6562

0.5100.490 0.5522

0.55120.55690.5542

0.56050.5595

0.56320.5625

09DX120.7600.740

10DX08

5/823/32

0.71950.7187

0.5100.490

0.61460.6136

0.61950.6167

0.00590.0021

0.62300.6220

0.62570.6250

10DX100.6350.615

10DX120.7600.740

10DX140.8850.865

11DX14 11/1625/32

0.78200.7812

0.8850.865

0.67700.6760

0.68200.6792

0.00600.0022

0.68550.6845

0.68820.6875

12DX08

3/47/8

0.87580.8750

0.06690.0657

0.5100.490

0.73900.7378

0.74440.7412

0.00660.0022

0.74750.7463

0.75080.7500

0.00450.0025

12DX120.7600.740

12DX161.0100.990


8 Standard Products

46

14DX12

7/8 11.00081.0000

0.06690.0657

0.7600.740

0.86390.8627

0.86940.8662

0.00670.0023

0.87250.8713

0.87580.8750

0.00450.0025

1/4

14DX140.8850.865

14DX161.0100.990

16DX12

1 11/81.1258 1.1250

0.7600.740

0.98880.9876

0.99440.9912

0.00680.0024

0.99750.9963

1.00081.0000

16DX161.0100.990

16DX241.5101.490

18DX1211/8

19/321.28221.2812

0.08240.0810

0.7600.740 1.1138

1.11261.12021.1164

0.00760.0026

1.12251.1213

1.12581.2500

18DX161.0100.990

20DX12

11/4 113/321.40721.4062

0.7600.740

1.23871.2371

1.24521.2414

0.00810.0027

1.24701.2454

1.25101.2500

0.00560.0030

20DX161.0100.990

20DX201.2601.240

20DX281.7601.740

22DX16

13/8 117/321.53221.5312

1.0100.990

1.36351.3619

1.37021.3664

0.00830.0029

1.37201.3704

1.37601.3750

22DX221.3850.365

22DX281.7601.740

24DX16

11/2 121/321.65721.6562

1.0100.990

1.48841.4868

1.49521.4914

0.00840.0030

1.49701.4954

1.50101.5000

5/16

24DX201.2601.240

24DX241.5101.490

24DX322.0101.990

26DX1615/8 125/32

1.78221.7812

1.0100.990 1.6133

1.61171.62021.6164

0.00850.0031

1.62201.6204

1.62601.6250

26DX241.5101.490

28DX16

13/4 115/161.93851.9375

0.09800.0962

1.0100.990

1.73831.7367

1.74611.7415

0.00940.0032

1.74701.7454

1.75101.7500

28DX241.5101.490

28DX281.7601.740

28DX322.0101.990

30DX16

17/8 21/162.06372.0625

1.5101.490

1.86321.8616

1.87131.8665

0.00970.0033

1.87201.8704

1.87601.8750

30DX301.8851.865

30DX362.2602.240

32DX16

2 23/162.18872.1875

1.0100.990

1.98811.9863

1.99631.9915

0.01000.0034

1.99601.9942

2.00122.0000

0.00700.0040

32DX241.5101.490

32DX322.0101.990

32DX402.5102.490

Part No.

NominalDiameter

Housing-ø DH

[BS 1916 H7]


Oil hole-ø

dL

WallThickness

s3

WidthB

Shaft-ø DJ

Bush-ø Di,a

Ass. in an H7

housing

ClearanceCD

Shaft-øDJm

[BS 1916 d8]


situ to BS 1916 H7

Clearance CDm

Di Domax.min.

max.min.

max.min.

max. min.

max.min.

max.min.

max.min.

max.min.

max.min.


8Standard Products

47

36DX32

21/4 27/162.43872.4375

0.09800.0962

2.0101.990

2.23782.2360

2.24632.2415

0.01030.0037

2.24602.2442

2.25122.2500

0.00700.0040

5/16

36DX362.2602.240

36DX402.5102.490

40DX3221/2 211/16

2.68872.6875

2.0101.990 2.4875

2.48572.49632.4915

0.01060.0040

2.49602.4942

2.50122.5000

40DX402.5102.490

44DX32

23/4 215/162.93872.9375

0.09910.0965

2.0101.990

2.73512.7333

2.74572.7393

0.01240.0042

2.74602.7442

2.75122.7500

44DX402.5102.490

44DX483.010 2.990

44DX563.510 3.490

48DX32

3 33/163.18893.1875

2.0101.990

2.98492.9831

2.99592.9893

0.01280.0044

2.99602.9942

3.00123.0000

3/8

48DX483.0102.990

48DX603.7603.740

56DX40

31/2 311/163.68893.6875

2.5102.490

3.48443.4822

3.49593.4893

0.01370.0049

3.49503.4928

3.50143.5000

0.00860.0050

56DX483.0102.990

56DX603.7603.740

64DX48

4 43/164.18894.1875

3.0102.990

3.98393.9817

3.99593.9893

0.01420.0054

3.99503.9928

4.00144.0000

64DX603.7603.740

64DX764.7604.740

Part No.

NominalDiameter

Housing-ø DH

[BS 1916 H7]


Oil hole-ø

dL

WallThickness

s3

WidthB

Shaft-ø DJ

Bush-ø Di,a

Ass. in an H7

housing

ClearanceCD

Shaft-øDJm

[BS 1916 d8]


situ to BS 1916 H7

Clearance CDm

Di Domax.min.

max.min.

max.min.

max. min.

max.min.

max.min.

max.min.

max.min.

max.min.


8 Standard Products

48

8.5 DX Thrust Washers - Inch sizes

All dimensions in inch

dP

Di

Do

sT

Ha

Do

d p

dD

Hd

[D10

]

DJ

Part No.

Inside-øDi

Outside-øDo

ThicknesssT

Dowel hole Recess depthHaø dD PCD-ø dP

max.min.

max.min.

max.min.

max.min.

max.min.

max.min.

DX060.51000.5000

0.87500.8650

0.06600.0625

0.07700.0670

0.69200.6820

0.0500.040

DX070.57200.5620

1.00000.9900

0.78600.7760

DX080.63500.6250

1.12501.1150

0.10900.0990

0.88000.8700

DX090.69700.6870

1.18701.1770

0.94200.9320

DX100.76000.7500

1.25001.2400

1.00500.9950

DX110.82200.8120

1.37501.3650

1.09901.0890

DX120.88500.8750

1.50001.4900 0.1400

0.1300

1.19201.1820

DX141.01001.0000

1.75001.7400

1.38001.3700

DX161.13501.1250

2.00001.9900

0.17100.1610

1.56701.5570

DX181.26001.2500

2.12502.1150

1.69201.6820

DX201.38501.3750

2.25002.2400

1.81701.8070

DX221.51001.5000

2.50002.4900

0.20200.1920

2.00501.9950

DX241.63501.6250

2.62502.6150

2.13002.1200

DX261.76001.7500

2.75002.7400

2.25502.2450

DX282.01002.0000

3.00002.9900

0.09700.0935

2.50502.4950

0.0800.070

DX302.13502.1250

3.12503.1150

2.63002.6200

DX322.26002.2500

3.25003.2400

2.75502.7450


8Standard Products

49

8.6 DX Strip


8.7 DX Strip - Inch sizesDX Strip Inch sizes are available as Non-Standard products on request.

ss

Wu

min

L

W

Part No. Length L Total Width W Usable Width WU min

Thickness sS

max.min.

S10150DX

503500

160 1501.071.03

S15190DX

200 190

1.561.52

S20190DX2.052.01

S25190DX2.572.53


9 Data Sheet for bearing design

50

9 Data Sheet for bearing designCompany:

Project:

Application:

Date:

Contact name:

Tel.:

Fax:

Email:

Quantity

Existing Design New Design Drawing attached YES NO

Annual

Dimensions in mm

Inside Diameter Di

Length B

Outside Diameter Do

Flange Diameter DflFlange Thickness sflLength of slideplate L

Width of slideplate W

Thickness of slideplate ss

Radial load F [N]

Axial load F [N]

Oscillating frequency nosc [1/min]

Rotational speed n [1/min]

Speed v [m/s]

Length of Stroke Ls [mm]

Frequency of Stroke [1/min]

Angular displacement ϕ [°]

Continuous operation [h]

Load

Service hours per day

Intermittent operation [h]

Movement

Housing (Ø, tolerance) DHShaft (Ø, tolerance) DJ

Fits and Tolerances

Housing material

Assembly with poor heat transfer properties

Assembly with good heat transfer properties

Material

Mating surface

Surface roughness Ra [µm]

Hardness HB/HRC

If grease, type with technical datasheet

Dry operation With lubricant

If oil, type with technical datasheet

Required service life LH [h]

Service life

Rotational movementSteady load Rotating load Oscillating movement

Cylindrical Bush Flanged Bush Thrust Washer Slideplate Special (Sketch)

Linear movement

B

Di

Do

Di

Dfl

Di

Do

Do

Ws S

B sfl sT

L

Temperature - ambient Tamb

Operating Environment

Temperature - min/max Tmin/Tmax

- Oil splash

- Oil circulation

- Oil bath

©2012 GGB. All Rights reserveds.

www.ggbearings.com

This handbook was designed by Profidoc Silvia Freitag

www.profidoc.de

01-12

Product Information

GGB gives an assurance that the products described in this documenthave no manufacturing errors or material deficiencies.

The details set out in this document are registered to assist in assess-ing the material's suitability for the intended use. They have beendeveloped from our own investigations as well as from generallyaccessible publications. They do not represent any assurance for theproperties themselves.

Unless expressly declared in writing, GGB gives no warranty that theproducts described are suited to any particular purpose or specificoperating circumstances. GGB accepts no liability for any losses, dam-ages or costs however they may arise through direct or indirect use ofthese products.

GGB’s sales and delivery terms and conditions, included as an integralpart of quotations, stock and price lists, apply absolutely to all businessconducted by GGB. Copies can be made available on request.

Products are subject to continual development. GGB retains the rightto make specification amendments or improvements to the technicaldata without prior announcement.

Edition 2009 (This edition replaces earlier editions which hereby losetheir validity).

Declaration on lead contents of GGB products/compliance with EU law

Since July 1, 2006 it has been prohibited under Directive 2002/95/EC(restriction of the use of certain hazardous substances in electrical andelectronic equipment; ROHS Directive) to put products on the marketthat contain lead, mercury, cadmium, hexavalent chromium, polybromi-nated biphenyls (PBB) or polybrominated diphenyl ethers (PBDE).Certain applications listed in the annex to the ROHS Directive areexempted. A maximum concentration value of 0.01% by weight andper homogeneous material, for cadmium and of 0.1% by weight andper homogeneous material, for lead, mercury, hexavalent chromium,PBB and PBDE shall be tolerated.

According to Directive 2000/53/EC on end-of life vehicles, since July 1,2003 it has been prohibited to put on the market materials and compo-nents that contain lead, mercury, cadmium or hexavalent chromium.Due to an exceptional provision, lead-containing bearing shells andbushes could still be put on the market up until July 1, 2008. This gen-eral exception expired on July 1, 2008. A maximum concentrationvalue of up to 0.1% by weight and per homogeneous material, for lead,hexavalent chromium and mercury shall be tolerated.

All products of GGB, with the exception of DU, DUB, SY and SP satisfythese requirements of Directives 2002/95/EC (ROHS Directive) and2000/53/EC (End-of-life Vehicle Directive).

All products manufactured by GGB are also compliant with REACHRegulation (EC) No. 1 907/2006 of December 18, 2006.

DX® and DSTM are trademarks of GGB.

Visit us on the internet:

www.ggbearings.com

marginally lubricatedold.servicatalogue.com/katalogdata/pdf/650050-1-1-1.pdf · energrease gsf...

Documents