Rolling Bearing Tolerances - Schaeffler Group

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Rolling bearing tolerancesDefinitions/Measurement principles

Symbol Examples of drawing notationsINA/FAG (old)Measurement principle ds(Ads) Ds(ADs)a157 079157 078ØdtØDtt157 082ØDt (Dmp)157 081157 0801ØDt (Dmp)tt 1 500standard filter value: 1 500standard filter type: Gauß157 088Ød157 087157 086tØd Deviation of mean diameterfrom nominal dimension ina single radial plane(diameter, mean)1 roundness or two-pointroundness respectively Half variation of diameter in asingle radial plane(two-point roundness)157 085Ødpermissibledisplay 2 t157 084Ød157 083aVdp/2 t Roundness – to MZCI (Minimum Zone Circle) is the minimum distance between theradii of two concentric circlesenclosing the roundnessprofile both inside and outside WavinessS 103207-ffstandard analysis: RTA157 091waviness toPF4.020W157 090wavinessN 030207157 089Vdp/2Vp/2VDp/2157 078a Deviation of single diameterfrom nominal dimension(diameter)Ødt dmp(Admp) Dmp(ADmp)CharacteristicSchaeffler Group (new)

Symbol Examples of drawing notationsINA/FAG (old)VdmpVmpVDmpMeasurement principleCharacteristicSchaeffler Group (new)t AaVdmp tt A Straightness157 102157 101 Variation in wall thickness Differential measurementB(PT)157 104A(PT)t A(PT) B(PT) t A(PT) B(PT)air bearingsupporttt157 099B157 103tAB t A BAØ157 097ØDcircumferenceradialttt ParallelismA157 097ØD157 096sensingsystemt AAcircumferenceradial157 098Ød157 105Ød157 095157 094aA Variation of the meandiameter of the various radialplanes in relation to eachother(two-point parallelism)

Symbol Examples of drawing notationsMeasurement principleCharacteristicSchaeffler Group (new) SymmetryBtt AAt157 108t1t 2 QN 4.54NTRt1t 2 S241004157 109 R tmeasure at multiple datum points Line form tolerance of radiit1: 1st and higher order:radius and formdeviationt2: 2nd and higherorder:form deviation157 110A157 106t A157 106Bt157 107INA/FAG (old) Deviation of singleinclination angle to surface(inclination angle deviation)NT t/L157 113157 112 157 111NTL Deviation of singleinclination angle to diameter(inclination angle deviation)NTDNTDM2157 115157 114NTD t/L157 119ATDLATDM1157 118157 117ATD t/LM2157 116LM1 Deviation of single taper angle(taper angle deviation)

Symbol Examples of drawing notationsINA/FAG (old)A(PT)Si t A Variation in wall thickness(axial runout)A(PT)t A157 127157 126157 125t A(PT) Variation in wall thicknessin cross-sectional planet A(PT)A point157 129157 128A(PT)157 130A Deviation of single width fromnominal dimensionVBsVCst A(PT)157 133157 132157 131BtaBt Variation in widthA(PT)157 136157 134VBs ta157 135 Bs(ABs) Cs(ACs)157 124157 123Ki tt A(PT)157 122t ASiSeCharacteristic Radial variation in wallthickness(radial runout)A pointKiKeMeasurement principleSchaeffler Group (new)

Symbol Examples of drawing notationsINA/FAG (old)1t A Ba157 143aaB(PT)aSD t AB point157 141A Variation of inclinationof bore to face1 multiple datum points1Sd.1aaaA157 146A157 145157 144B(PT)aSd.1 t At A B(PT) Ts(ATs) Deviation of actual bearingwidth from nominal width(section height)Kea t AKia t A157 148 Radial runout of inner ringand outer ring on assembledbearing Radial runout of inner ringand outer ring on assembledbearingKiaslightly conicaltest mandrelA157 152AKea157 151Kea t AKia t AAB157 153AB157 150Kea t AKia t B157 149Kea t AKia t B157 154157 147T157 147Tturn at least 360 before measuringKiaKeaKiaKea Variation of inclinationof outside surface to face1 multiple datum pointst A B(PT)AACharacteristic157 142SDMeasurement principleSchaeffler Group (new)

Symbol Examples of drawing notationsMeasurement principleBBA157 158rs157 158rs–r1–r1 Axial runout of inner ringand outer ring on assembledbearing Chamfer dimensiondependent on form(smallest or largest singlechamfer dimension)SiaSearsrs minrs maxr1r2157 157A157 155t A157 156Sea t BSia t At BSiaSeaCharacteristicSchaeffler Group (new)157 159INA/FAG (old)Gauge Chamfer dimension notdependent on formr2–r2–Rz 4Eht EinsatzhärtungstiefeNht NitrierhärtetiefeRht Einhärtungstiefe nach demRandschichthärtenRz 4CHD Case hardening depthNHD Nitriding hardness depthSHD Surface hardening depthCC Critical Characteristic157 165CC157 162157 16130 0,020 Indication of characteristicSC Significant Characteristic Surface notationU upper limitL lower limitU –0,25/Ra 0,4L –0,25/Ra 0,2 c 0,25157 1660,40,2157 169RaRzRpkRkRvkSC157 16730 0,020157 163KM30 0,020–0,25 transmission trait ( c)Ra, Rz parameter157 168HM Hardness parameters157 170SCCC157 164157 160r1–r2

MATNR 031492754-0000 / TPI 138 / GB-D / 20061210 / Printed in Germany by Mandelkow GmbHEvery care has been taken to ensure theSchaeffler KGSchaeffler KGIndustriestrasse 1–3Georg-Schäfer-Strasse 3091074 Herzogenaurach (Germany)97421 Schweinfurt (Germany)in this publication but no liability can beInternet www.ina.comInternet www.fag.comaccepted for any errors or omissions.E-MailE-MailWe reserve the right to make In Germany:In Germany:PhoneFaxPhone0180 5003872Fax0180 50038730180 50038720180 5003873correctness of the information containedchanges. Schaeffler KG · 2006, DecemberFrom Other Countries:Phone 49 9132 82-0From Other Countries:Phone 49 9721 91-0This publication or parts thereof may notFaxFaxTPI 138 GB-D 49 9132 82-4950 49 9721 91-3435be reproduced without our permission.

INA/FAG (old) Schaeffler Group (new) Vdmp Vmp VDmp Variation of the mean diameter of the various radial planes in relation to each other (two-point parallelism) Parallelism Straightness Variation in wall thickness Differential measurement Ød t A A t 157 094 Ød Vdmp 157 095 a a 157 096

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