>> P.273
G2■StructureandFeaturesIKOCombinedTypeNeedleRollerBearingsarecom-binationsofaradialbearingandathrustbearing.Cagedneedlerollerbearingsareusedasradialbear-ingsandthrustballbearingsorthrustrollerbearingsareusedasthrustbearings.Theyarecompactandveryeconomical,andcanbesubjectedtoradialloadsandaxialloadssimultaneously.Theyarewidelyusedformachinetools,textilemachinery,andindustrialmachinery.StructuresofCombinedTypeNeedleRollerBearingsDustcoverThrustballbearingBearingringforthrustbearingInnerringRadialneedlerollerbearingRadialneedlerollerbearingThrustrollerbearingNeedlerollercageNeedlerollercageInnerring(B)Ballcage(Angularcontacttype)Ballcage(3-pointcontacttype)BearingringforthrustbearingOuterringOuterringOuterringOuterringInnerring(A)InnerringInnerring■TypesThetypesofCombinedTypeNeedleRollerBearingsshowninTable1areavailable.Table1.1TypeofbearingTypeWithdustcover──NBX…ZNBXI…ZNAX…ZNAXI…ZNBXNBXINAXNAXICombinedwiththrustrollerbearingCombinedwiththrustballbearingWithoutinnerringWithinnerringWithoutinnerringWithinnerringTable1.2TypeofbearingTypeModelcodeNATBNATACombinedwiththree-pointcontactballbearingCombinedwithangularcontactballbearingNeedleRollerBearingswithThrustBallBearingInthisseries,needlerollerbearingsarecombinedwiththrustballbearingstoreceivethrustloads.Inbearingswithadustcover,thedustcoverisformedfromathinsteelplateandfixedtoagroovecutontheoutercylindricalsurfaceoftheouterringcollar.Thecoverformsalabyrinthwiththethrustracewayring,andisthereforeeffectiveinpreventingleakageofgreaseandpenetrationofdustanddirt.Inthecaseofbearingswithoutaninnerring,thetoler-ancesofrollersetborediameterFwareshowninTable14onpageA33.Therefore,therequiredradialinternalclearancescanbeselectedbycombiningthebearingswithshaftsthathavebeenheat-treatedandfinishedbygrindingasshowninTable23onpageA42andTable26onpageA44.G
| < 
| 
> | 
>>
