>> P.48
Thedimensionsofshaftandhousingrelatedtomountingoftheneedlerollerbearingsareshowninthetableofdimensionsforeachbearing.(SeeFig.13.)Theminimumvalueoftheshaftshoulderdiameterdawhichreceivestheinnerring,andthemaximumvalueofthehousingshoulderdiameterDawhichreceivestheouterring,representtheeffectiveshoulderdiame-ters(excludingthechamferedpart)whichmakeprop-ercontactwiththesidefacesoftheinnerandouterringsrespectively.Also,themaximumvalueoftheshaftshoulder(orinnerringretainingpiece)diameterdaisthedimen-sionrelatedtotheeaseofmounting/dismountingoftheshaftandinnerringto/fromthehousingandouterring.Thelargestpermissiblesinglecornerradiusrasmaxoftheshaftandhousingmustbesmallerthanthesmall-estpermissiblesinglechamferdimensionrsminofthebearingsothatthesidesurfaceofthebearingcanmakepropercontactwithTable28showstherelateddimensions.Fordimensionsofthefilletreliefwhenfinishingtheshaftorhousingbygrinding,inTable29arerecommended.Forotherdimensionsrelatedtomounting,seetherelatedsectionforeachbearingasrequired.Inaddition,foreaseindismountingofbearings,itisconvenienttomakenotchesintheshoulderoftheshaftorhousingtoallowtheinsertionofdismountinghooks.thevaluesshowntheshoulder.DadaFig.13DimensionsrelatedtomountingSUJ2JISG4805SCM415〜421JISG4053JISG4053SNCM220JISG4053SCr420JISG4053SNC415,815S15CKJISG4051Whenusingshaftsandhousingsasraceways,thefol-lowingmaterialsaregenerallyused.High-carbonchromiumbearingsteel Carburizingsteel Carburizingsteel Carburizingsteel Carburizingsteel Carburizingsteel Inaddition,S50CandS55C(JISG4051)canbeusedafterthroughhardeningorinductionhardening.Thehardened〜+180°Cafterhardeningmusthaveamartensitemicrostructure.theracewaysurfacebycasehard-Whenhardeninginductionhardening,asurfacehardnessofeningor58〜64HRCandanappropriatethicknessoftheTheminimumhardenedeffectivethehardenedlayerafterheattreatmentandgrindingisdefinedasthedistancefromthesurfacetothedepthwherethehardnessis550HV,anditisobtainedbythefollowingequation.temperingat+160fineuniformlayermustbeensured.layerproducedbythicknessofEht≧0.8Dw(0.1+0.002Dw)……………(36)where,Eht: Minimumeffectivethicknessofthehardenedlayer, mm Dw:Rollerdiameter, mmGenerally,hardenedlayerisatleast0.3mm.therequiredeffectivethicknessoftheA45RacewaymaterialsandheattreatmentDimensionsrelatedtomountingofbearings
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