>> P.145
DNominalbearingborediameter dmmStandardtypeWithsealsonbothsidesWithasealononesideNumberofoilholesoftheinnerring00----00-11-000120d≦76.20076.200<dTable6.2NumberofoilholesoftheinnerringCagedNeedleRollerBearingsBearingtypeMetricseriesNATRITAFIInchseriesBRIGuideNeedleRollerBearingsMetricseriesGTRIRemarkThetypewithanoilhole(s)isprovidedwithanoilgroove.■MatchedSetBearings■MountingtwoormoreMachinedTypeNeedleWhenusingRollerBearingsadjacenttoeachotheronthesameshaft,itisnecessarytoobtainanevenloaddistribu-Onrequest,asetofbearingsisavailable,intion.whichbearingsarematchedtoobtainanevenloaddistribution.MountingdimensionsRollerBearingsareshowninthetableofdimensions.forMachinedTypeNeedle■ExtendedLifeSpecificationMachinedTypeNeedleRollerBearingsD6Modelnumber:NA4904LoadLubrication:10,500N:CleaningoilubriatdStandardheat-tratedproductExtendedlfspeciiationproductsCumulativedamagerate%LifehFig.1LifeTestResultRemarkThistableshowstheresultoflifetestingunderloadconditionsat50%ofthebasicdynamicrating.TheExtendedLifeSpecificationwithspecialheattreatmentlasted5timeslongerormoreinL10lifecomparedtothestandardheat-treatedproducts.treatmentExtendedLifeSpecificationMachinedTypeNeedleRollerBearingsaretreatedwithanewlydevelopedspecialheatthatenhancesthebearing'ssurfacehardnessandtoughness,andsuppressesthegenerationandgrowthofdamageonthesurface.Significantlifeextensioncanbeachievedunderhighloadorundertheconditionoflubricationcontaminatedwithforeignsubstances.Inalifecomparisontest,asshowninFigure1,IKO'streatedExtendedLifeSpecificationspecialheatproductslasted5timeslongerthanstandardheat-treatedproducts.ExtendedLifeSpecificationMachinedTypeNeedleRollerBearings,availableaccordingtothe"ApplicableProductionSize"showninTable7,aremadetoorderuponrequest.Table7ApplicableProductionSizeFwdWithinnerringd=10〜75mmNA4900〜4915NA6901〜6915TAFI102216〜7510535TRI153320〜7510845WithoutinnerringFw=14～85mmRNA4900〜4915RNA6901〜6915TAF142216〜8510535TR203320〜8310845
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