bearings and spacers rg36 a2 - reliance precision limited · 3 10 mm bore 123 bronze bearings...

Bearings and Spacers

Bea

rings

and

Spa

cers

12

Section Contents

Ball Bearings P4 ......................................................................Page 122

Bronze Bearings ........................................................................Page 123

Moulded Bearings......................................................................Page 124

Bearing Preload Washers ........................................................Page 125

Bearing Spacers ........................................................................Page 126

Technical Information................................................................Page T121

122 Contact us for product information, design support and custom [email protected] +44 (0) 1484 601002 www.reliance.co.uk

Bearings andSpacers

Associated ProductsShafts: page 112

Bearing preload washers: page 125Bearing spacers: page 126

Part number selection tablePlain Flanged

Part Number Dimensions Specification

Plain FlangedBoreDiaØB

O/DØD

Max Min

Width

W

Radii

R(min)

FlangeDiaØA

Max Min

FlangeWidth

EMax Min

Load RatingsN

DynamicC

StaticCo

B1102SP4B1103SP4B1104SP4B1105SP4B1106SP4B1108SP4B1110SP4

B2102SP4B2103SP4B2104SP4B2105SP4B2106SP4B2108SP4B2110SP4

234568

10

57911131619

4.9966.9968.99610.99612.99615.99618.995

2.33.04.05.05.06.07.0

0.080.100.100.150.150.200.30

6.158.15

10.3512.5515.0518.0521.05

6.058.05

10.2512.4514.9517.9520.95

0.60.81.01.01.11.31.5

0.560.760.960.921.021.221.38

192432658734

109617951922

59149226282437776915

Features and options• Operating temperature range: 73ºC to +121ºC• Lubricant: grease to MILG21164 and MILG23827• Double shielded• Imperial sizes available

Technical support• Spur gear and bearing load calculation see page T121• Bearing force sharing see page T123• Bearing installation and housing considerations see page T124

P4 Ball Bearings

All dimensions in mmGenerally in accordance with ISO 492,tolerance class 4Material: X65Cr13 stainless steel

3 10 mm Bore

123

Bronze Bearings

Contact us for product information, design support and custom [email protected] +44 (0) 1484 601002 www.reliance.co.uk

Bea

rings

and

Spac

ers

All dimensions in mmGeneral tolerances ±0.13 mmMaterial: Bronze ASTM B 438

Type 2, Grade 1


Part number selection tablePart Number Bore

ØB1O/DØD

LengthL

Flange DiaØA

Flange WidthEPlain Flanged

BBM13BBM14BBM15BBM16BBM18BBM110

BBM23BBM24BBM25BBM26BBM28BBM210

34568

10

688

101213

61212121216

912141616

1.52.0

2.02.01.5

1 Bearing bore tolerances after assembly are: plain bearings H7, flanged bearings H8.Recommended housing bore H7

Plain Flanged

Features and options• Operating temperature range: 20ºC to +100ºC• Oil impregnated• Max speed 30,000 rpm• p.v (@0.5 m/s) = 1.75 N/mm2.m/s• pmax =13.8 N/mm• vmax = 6.1 m/s (rotational)• Imperial sizes available

2 12 mm Bore

124

Moulded Bearings


Bearings andSpacers


Leadscrews: page 71Bearing spacers: page 126

All dimensions in mmGeneral tolerances ±0.13 mmMaterial: Self lubricating mouldedthermoplastic

Part Number BoreØB #

O/DØD

LengthL

Flange DiaØA

Flange WidthEPlain Flanged

BM82 2.0542.014 3.5 3.00

2.86

BM83 BM93 3.0543.014 4.5 3.00

2.867.467.24 0.75

BM84 BM94 4.0684.020 5.5 4.00

3.829.469.24 0.75

BM85 5.0405.010 7.0 5.00

4.82

BM95 5.0685.020 7.0 5.00

4.8210.9510.68 1.00

BM86 BM96 6.0686.020 8.0 6.00

5.8211.9511.68 1.00

BM88 8.0838.025 10.0 8.00

7.78

BM98 8.0838.025 10.0 9.50

9.2814.9514.68 1.00

BM810 BM910 10.08310.025 12.0 10.00

9.7817.9517.68 1.00

BM812 BM912 12.10212.032 14.0 12.00

11.7319.9319.61 1.00

Part number selection table

# Tolerance for ØB is after press fitting into a housing bore of tolerance H7

Plain Flanged

Features and options• Operating temperature tange: 40ºC to +130ºC• (p.v)max = 1.0 N/mm2.m/s• pmax = 80 N/mm2

• vmax = 1.0 m/s (rotational) or 4.0 m/s (linear)• Imperial sizes available

4.5 15 mm Bore

125

Bearing Preload Washers


Bea

rings

and

Spac

ers

All dimensions in mmGeneral tolerances ±0.13 mm

Material: Stainless steel 300 seriesTreatment: Spring tempered

Associated ProductsInternal circlips: page 1321Bearings: page 122

PartNumber

Housing Bore(nominal)

O/DØD

BoreØd

Free HeightA

CompressedHeight B

Load in N toDeflect to B

EPL1EPL2EPL4EPL8EPL10

1013161921

9.512.515.518.520.5

4.57.510.513.015.0

1.21.51.51.51.8

1.0

1519192929


Features and options• Imperial bearing preload washers• Available in spring steel, add ST to part number eg EPL4ST

Inner Race

126

Bearing Spacers


Bearings andSpacers


Leadscrews: page 71Bearings: page 122

All dimensions in mmGeneral tolerances ±0.13 mmMaterial: Stainless steel 300 series

ShaftNominal

Spacer BoreØd

Spacer O/DØD

234568

10

234568

10

3.04.15.36.77.9

10.212.3

NominalShaft Dia

Ød

Thickness B± 0.025

0.05 0.10 0.15 0.20 0.25 0.30 0.40 0.50234568

10

SS1117SS1125SS1133SS1137SS1145SS1149SS1153

SS1118SS1126SS1101SS1138SS1105SS1109SS1113

SS1119SS1127SS1102SS1139SS1106SS1110SS1114

SS1120SS1128SS1134SS1140SS1146SS1150SS1154

SS1121SS1129SS1103SS1141SS1107SS1111SS1115

SS1122SS1130SS1135SS1142SS1147SS1151SS1155

SS1123SS1131SS1104SS1143SS1108SS1112SS1116

SS1124SS1132SS1136SS1144SS1148SS1152SS1156

Dimensions


Product options• Imperial sizes available

Outer Race

127

Bearing Spacers


Bea

rings

and

Spac

ers

All dimensions in mmGeneral tolerances ±0.13 mm

Material: Stainless steel 300 series

Associated ProductsInternal circlips: page 1321Bearings: page 122

Bearing ODNominal

Spacer O/DØD

Spacer BoreØd

57911131619

57911131619

4.25.77.89.711.113.816.6

Bearing1 Thickness BBore(nom)

OD(nom)

± 0.0250.05 0.10 0.15 0.20 0.25 0.30 0.40 0.50

234568

10

57911131619

SS3113SS3121SS3129SS3134SS3142SS3147SS3152

SS3114SS3122SS3130SS3135SS3143SS3148SS3153

SS3115SS3123SS3101SS3136SS3104SS3107SS3110

SS3116SS3124SS3131SS3137SS3144SS3149SS3154

SS3117SS3125SS3102SS3138SS3105SS3108SS3111

SS3118SS3126SS3132SS3139SS3145SS3150SS3155

SS3119SS3127SS3103SS3140SS3106SS3109SS3112

SS3120SS3128SS3133SS3141SS3146SS3151SS3157

Dimensions


Product options• Imperial sizes available

1 Applies to standard Reliance bearing sizes

TechnicalInformation

T121



Tech

nica

lIn

form

atio

n

SPECIFICATION

The first step in choosing the correct bearing for an application is to determine the forces which it willsupport in service. The forces will depend on the exact configuration of the system and will probablyinclude some, or all, of the following:

• The weight of the shaft, including gears and other shaft attachments.• Gear mesh reaction forces, due to torque transmission (see below).• Gear separation due to antibacklash forces.• Forces due to belt or pulley tensions.• Axial preload forces.

GEAR MESH REACTIONS

In order to calculate the loads which will be applied to the bearings in the simply supported spur gearpass arrangement shown on the next page, it is first necessary to calculate the forces at the gearmesh.

The tangential force at the gear mesh can be calculated from the following equation:

where T = Torqueand r = Radius

and the separating force at the gear mesh can be calculated from:

Wr' = Wt tanφt where φt = transverse pressure angle= normal pressure angle for spur gears= 20º for our standard gears

(for 20º pressure angle spur gear)

If required, the total radial load at the gear mesh can be calculated from the final equation:

Bearing loads

PositionForces At These Positions

Tangential Force Separating Force Total Radial Load

Gear Mesh

Bearing A

Bearing B

Bearing C

Bearing D

Wt = T/r

Wr' = 0.364Wt

Wr = (Wt)2 + (Wr')2

TechnicalInformation Bearings and Spacers

T122 Contact us for product information, design support and custom [email protected] +44 (0) 1484 601002 www.reliance.co.uk

TechnicalInform

ation

Bearing loads and gear mesh forces diagram

For bearing life calculations based on these radial loads see page T123.

Note These equations can only be used for spur gear calculations, because they are not affected byselfgenerated axial forces.

TechnicalInformation

T123



Tech

nica

lIn

form

atio

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Radial load on bearing


1. Radial Shaft Load Between Two Bearings Loads are in constant units

FORCE SHARING

To determine how the forces are shared between a pair of bearings, use the equations below forthese two most frequently occurring configurations:

2. Overhung Radial Load



The individual bearing loads can then be used to predict the bearing life.

BEARING LIFE

The life of a bearing is defined as the length of time a bearing will operate satisfactorily in theapplication at its operating speed under applied load. Life predictions depend on a careful definition offailure criteria and consideration of operating environment, mounting practice, lubrication, operatingspeed and loading. As a guide, the relationship between actual applied load and bearing fatigue life isgiven below:

= Rated life in hoursN = Speed in rpmP = Bearing load (e.g. N)C = Bearing capacity (e.g. N)

TechnicalInformation Bearings and Spacers

T124 Contact us for product information, design support and custom [email protected] +44 (0) 1484 601002 www.reliance.co.uk

TechnicalInform

ation

INSTALLATION AND HOUSING CONSIDERATIONS

The installation of a bearing will usually be determined by how it fits with its mating components.Interference or transition fits provide the most positive location of the bearing, however, they willrequire pressing during installation. Clearance fits allow the bearing to be assembled very easily, butcould potentially lead to problems depending on the operating conditions. If a press fit is required, it isessential that no appreciable force is transferred through the rolling elements of the bearing duringinstallation.

Special care must be taken when using bearings in aluminium housings, especially when widetemperature variations are expected. It is possible for the contraction of the housing to squash thebearing raceway and remove the radial clearance required for the bearing to operate.

Potential problems with clearance fits:Fretting Wearing away of the surface due to rubbing of the components.Accuracy Accuracy can be compromised due to unpredictable movement.

Potential problems with interference fits:Assembly Can be difficult or impossible without damaging the bearing.Radial clearance Can be reduced if the interference is too great.

RG36 Issue A2

bearings and spacers rg36 a2 - reliance precision limited · 3 10 mm bore 123 bronze bearings...

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