>> P.53
A50ABCDEFGHIJKLMGreaselubrication1AmountofgreasetobefilledTheamountofgreasetobefilleddependsonthehousingstructure,dimensions,typeofgreaseusedandatmosphere.Generally,fillingabout1/3to1/2ofthefreespaceinsideofthebearingandthehousingisconsideredtobeappropriate.Toomuchwillcauseariseintemperature,andcareshouldbetakenespe-ciallyathighspeedrotations.InFig.19,severalgreasepocketsareprovidedbythegreasesectorsononesideofthebearing.Evenifthefilledgreaseisdispersedbythecentrifugalforceathighrotationalspeeds,itistrappedbythegreasepocketsanddivertedbackintothebearingagain.Oldgreaseaccumulatesinthespaceontheoppositesideofthebearing,andthiscanberemovedperiodicallybytakingoffthecover.2ReplenishmentofgreaseThelifeofgreasedependsonitstypeandquality,thetypeanddimensionsofthebearing,operatingcondi-tions,temperature,amountofwear,penetrationoffor-eignparticlesandwater,etc.Fig.20showsthegreasereplenishmentintervalsasageneralguideline.Thevaluesobtainedfromthisdiagramapplyundernormalloadconditionswhenthemachinebodyisstationaryandforcessuchasinertiaarenotactingonit,andtheoperatingtemperatureontheoutersurfaceofthebearingouterringislessthan+70°C.Ifthetemperatureexceeds+70°C,asageneralrule,thereplenishmentintervalishalvedforevery15°Cincrease.Fig.20IntervalforreplenishmentofgreaseFig.19Remarkdistheborediameteroftheinnerring.Forabearingwithoutaninnerring,therollersetborediameterFwisusedford.Replenishmentintervalforgrease,tfhoursRotationalspeed,nmin-120020030040050060080010001500200030004000500060008000100001500020000400600100020004000600010000d=10mm2030405060801001201401601802002402803001N=0.102kgf=0.2248lbs.1mm=0.03937inch
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