>> P.275
G4Fig.1showsmountingexamplesofCombinedTypeNeedleRollerBearings.WhenapplyingpreloadtotheNAXandNBXmodels,itisrecommendedthatthrustracewayringsarenottighteneddirectlywithnuts,butaretightenedusingspringsasshowninFig.2.MountingtwoNATAmodelssymmetricallyallowsthemtobesubjectedtotwo-wayaxialloads.Whenmountingthesemodels,anaxialclearanceof0.2〜0.3mmshouldbeprovidedintheangularcontactballbearingssothatradialloadsarenotappliedtotheangularcontactballbearings.Dimensionsrelatedtomountingshouldbebasedonthetableofdimensions.■Mounting■FitTherecommendedfitsforCombinedTypeNeedleRollerBearingsareshowninTable3.■ClearanceCombinedTypeNeedleRollerBearingsaremanufac-turedtohavetheradialinternalclearanceCNshowninTable18onpageA37.■RatingLifeInCombinedTypeNeedleRollerBearings,cagedneedlerollerbearingsaresubjectedtoradialloadswhilethrustbearingsreceiveaxialloads.Therefore,itisnecessarytocalculatetheirlivesrespectively(pageA17).■LubricationGreaseisnotprepackedinCombinedTypeNeedleRollerBearings,soperformproperlubricationforuse.Operatingwithoutlubricationwillincreasethewearoftherollingcontactsurfacesandshortenthebearinglife.Fig.1MountingexamplesFig.2MountingexamplewhenapplyingpreloadTable2TolerancesItemTypeofbearingNAX(I)(1)NBX(I)(1)NATB59Boredia.ofbearingringforthrustbearingAssembledbearingwidthBearingheightofthrustbearingWidthofinnerringdiE7 0-0.25 0-0.20 0-0.3LHBDimensionsymbolToleranceDimensionunit:mmNote(1)AlsoapplicabletobearingswithdustcoverTable3RecommendedfitsItemTypeofbearingNAX(I)(1)NBX(I)(1)NATA59NATB59h5,k5──k5K6,M6M6(2)k5(2)HousingboreToleranceclassShaftWithoutinnerringWithinnerringNotes(1) Thehousingboreforthethrustbearingmustbemachinedtobemorethan0.5mmlargerthantheout-sidediametersD1andD2toensurethatitdoesnotincurradialloads.(2) Ifthefitismadetighterthanspecifiedinthistable,radialloadswillactuponthethrustbearing,limitingitsfunction.■OilHoleTheouterringofCombinedTypeNeedleRollerBearingshasanoilgrooveandanoilhole.Whenouterringswithmultipleoilholesorinnerringswithoilhole(s)arerequired,pleasecontactIKO.G
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