>> P.73
B6■Lubrication■OilHoleBearingswithprepackedgreaseareshowninTable6.ALVANIAGREASES2(ShellLubricantsJapanK.K.)isprepackedasthelubricatinggrease.Inthecaseofbearingswithoutprepackedgrease,performproperlubricationforuse.Ifthebearingsareoperatedwithoutlubrication,thewearoftherollercontactsurfaceswillincreaseandthebearinglifewillbeshortened.ForShellTypeNeedleRollerBearingswithanoilhole,"OH"isappendedtotheendoftheidentificationnumber.ExampleTA2525ZOHThesymbol"OH"isnotmarkedonthebearingitself,butisshownonitspackaging,etc.Whenbearingswithmultipleoilholesarerequired,pleaseconsultIKO.■MountingShellTypeNeedleRollerBearingsshouldbepressedintothehousingsgentlyusingtheappropriatetoolasshowninFig.1,withtheirmarkedendsurfaceup.Astheouterringisthin,itmustneverbestruckdirectlywithahammer.SincetheouterringsofShellTypeNeedleRollerBearingsarefirmlyfittedtohousingboreswithinter-ference,itisunnecessarytofixthemaxially.Fig.2showsmountingexamples.■SpecificationsofshaftandhousingShellTypeNeedleRollerBearingsarecommonlyusedwithoutaninnerring.Insuchcases,thesurfacehardnessoftheracewaysurfaceshouldbe58〜64HRCandthesurfaceroughnessshouldnotexceed0.2μmRa.However,whentheoperatingconditionisnotsevere,asurfaceroughness0.8μmRaorlesscanbeused.Ifthesurfacehardnessislow,theloadratingmustbecorrectedbythehardnessfactorshownonpageA20.Whentheshaftcannotbeheattreatedandfinishedbygrinding,theuseofIKOInnerRingsforShellTypeNeedleRollerBearings(SeepageH1.)isrecom-mended.■StaticSafetyFactorSinceShellTypeNeedleRollerBearingsemployanouterringmadefromathinsteelplatewhichisdrawn,carburizedandquenched,excessivelylargeloadsmustbeavoided.Therequiredstaticsafetyfactorisusuallymorethan3.Fig.2MountingexamplesFig.1ExampleofmountingtoolTable6BearingswithprepackedgreaseBearingtypeSeriesMetricseriesInchseriesTLA,TLAM,YTLTA,TAM,YTBA,BAM,YBBHA,BHAM,YBHFullcomplementGreaseretainedWithsealsClosedendStandardCaged××××××××〇---〇〇〇〇〇:Withprepackedgrease×:WithoutprepackedgreaseDFw-0.2-0.315°-0.0251N=0.102kgf=0.2248lbs.1mm=0.03937inch
| < 
| 
> | 
>>
