>> P.274
NeedleRollerBearingswithThrustRollerBearingthisseries,needlerollerbearingsarecombinedInwiththrustrollerbearingstoreceivethrustloads.Theiraxialloadratingsaregreaterthanthoseofbear-ingsthatarecombinedwiththrustballbearings.Also,elasticdeformationoftherollingcontactsurfacesunderloadisminimal.Furthermore,thethrustbear-ingsectionisfinishedtohighaccuracy,andthereforehighrotationalaccuracyisobtainedinthecaseofbothverticalandhorizontalshafts.Liketheneedlerollerbearingswiththrustballbearing,thisseriesalsoincludesbearingswithadustcoverandbearingswithaninnerring.NeedleRollerBearingswithAngularCon-tactBallBearingInthisseries,cagedneedlerollerbearingsarecom-binedwithangularcontactballbearingstoreceivethrustloads.Thesebearingsconformtotheinterna-tionaldimensionseries#59,whichisbasedontheISOStandard.Theycanwithstandheavyradialloadsandunidirectionalaxialloadssimultaneously.Whentheaxialloadexceeds25%oftheradialload,theradialloadwillbeinducedintheangularcontactballbearing,andbearinglifewillbeaffected.Therelationshipbetweenthetwoloadsmustthereforebetakenintocarefulconsideration.NeedleRollerBearingswithThree-pointContactBallBearingThesebearingscanwithstandheavyradialloadsandbi-directionalaxialloadsatthesametimeduringhigh-speedrotation.innerringsaresepa-Sinceratedattheymustbefirmlytightenedagainsttheshaftintheaxialdirection.Theaxialclearanceofthisbearingis0.1〜0.3mm,andloadshouldnotexceed25%oftheradialload.thecenteroftheballracewaysurface,thenon-interchangeablelikeNATA59,theaxial■IdentificationNumberTheidentificationnumberofCombinedTypeNeedleRollerBearingsconsistsofamodelcode,dimen-sions,anysupplementalcodesandaclassificationsymbol.Someexamplesareshownbelow.ExamplesofidenticationnumberExample1ModelcodeDimensionsSupplementalcodeClassificationsymbolNAXI1730ZP6TypeofbearingBearingborediameter(17mm)Assembledbearingwidth(30mm)WithdustcoverAccuracyclass(Class6)Example2ModelcodeDimensionsNATA5905TypeofbearingDimensionseriesBorediameternumber■AccuracyDimensionalaccuracyandrotationalaccuracyofCombinedTypeNeedleRollerBearingsarebasedonTable2belowandTables12and13onpageA31.ThetolerancesforthesmallestsinglerollersetborediameterofbearingswithoutinnerringarebasedonTable14onpageA33.ThicknessvariationsofthrustringsofNAX(I)andNBX(I)arebasedonTable2.4onpageF5.BorediameterofthesmallwidthinnerringofNATB59ismadeforatransitionfitwithk5toleranceshaft.G3
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