>> P.275
G■RatingLifeInCombinedTypeNeedleRollerBearings,cagedneedlerollerbearingsaresubjectedtoradialloadswhilethrustbearingsreceiveaxialloads.Therefore,itisnecessarytocalculatetheirlivesrespectively(pageA17).■MountingFig.1showsmountingexamplesofCombinedTypeNeedleRollerBearings.WhenapplyingpreloadtotheNAXandNBXmodels,itisrecommendedthatthrustracewayringsarenottighteneddirectlywithnuts,butaretightenedusingspringsasshowninFig.2.twoNATAmodelssymmetricallyallowsMountingthemtobesubjectedtotwo-wayaxialloads.Whenmountingthesemodels,anaxialclearanceof0.2〜0.3mmshouldbeprovidedintheangularcontactballbearingssothatradialloadsarenotappliedtotheangularcontactballbearings.Dimensionsrelatedtomountingshouldbebasedonthetableofdimensions.Table2TolerancesItemTypeofbearingDimensionunit:mmDimensionsymbolToleranceNAX(I)(1)NBX(I)(1)Boredia.ofbearingringforthrustbearingAssembledbearingwidthBearingheightofthrustbearingNATB59WidthofinnerringdiLHBE7 0-0.25 0-0.20 0-0.3Note(1)Alsoapplicabletobearingswithdustcover■ClearanceCombinedTypeNeedleRollerBearingsaremanufac-turedtohavetheradialinternalclearanceCNshowninTable18onpageA37.■FitTherecommendedRollerBearingsareshowninTable3.fitsforCombinedTypeNeedleTable3RecommendedfitsItemToleranceclassTypeofbearingNAX(I)(1)NBX(I)(1)NATA59NATB59ShaftWithoutinnerringWithinnerringh5,k5──k5k5(2)HousingboreK6,M6M6(2)Notes(1) Thehousingboreforthethrustbearingmustbemachinedtobemorethan0.5mmlargerthantheout-itdoesnotsidediametersD1andD2toensurethatincurradialloads.(2) Ifthefitismadetighterthanspecifiedinthistable,radialloadswillactuponthethrustbearing,limitingitsfunction.■LubricationisnotprepackedGreaseinCombinedTypeNeedleRollerBearings,soperformproperlubricationforuse.Operatingwithoutlubricationwillincreasethewearoftherollingcontactsurfacesandshortenthebearinglife.■OilHoleTheouterringofCombinedTypeNeedleRollerBearingshasanoilgrooveandanoilhole.Whenouterringswithmultipleoilholesorinnerringswithoilhole(s)arerequired,pleasecontactIKO.Fig.1MountingexamplesFig.2MountingexamplewhenapplyingpreloadG4
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