Knowledge-of-Bearing

一.Typeofrollingbearings1.DeepgrooveballbearingsOpentypeShielded/sealedtypeWithlocatingsnapringMaximumtypeDouble-rowZZ2RU2RS2RDNRWithfillingslot680,690,600,620,630,(ML)Extra-small,miniaturebearing6800,6900,16000,6000,6200,6300,6400M6200M630042004300Themostpopulartypesamongrollingbearings,widelyusedinavarietyofindustries.Radialloadandaxialloadinbothdirectionscanbeaccommodated.Suitableforoperationathighspeed,withlownoiseandlowvibration.Sealedbearingsemployingsteelshieldsorrubbersealsarefilledwiththeappropriatevolumeofgreasewhenmanufactured.2.AngularcontactballbearingsSingle-rowBack-to-backarrangementFace-to-facearrangementTandemarrangementDouble-rowDBDFDTWithfillingslot7000,7200,7300,7400Contactangle307000B,7200B,7300B,7400BContactangle407900C,7000C,7200C,7300CContactangle15HAR900C,HAR000CContactangle1532003300Contactangle3252005300Contactangle24Bearingringsandballspossesstheirowncontactanglethatisnormally15,30or40.Largercontactangle---higherresistanceagainstaxialloadSmallercontactangle---moreadvantageousforhigh-speedrotationSingle-rowbearingscanaccommodateradialloadandaxialloadinonedirection.DBandDFmatchedpairbearingsanddouble-rowbearingscanaccommodateradialloadandaxialloadinbothdirections.DTmatchedpairbearingsareusedforapplicationswhereaxialloadinonedirectionistoolargeforonebearingtoaccept.Angularcontactballbearingsareusedforhighaccuracyandhigh-speedoperation.3.Self-aligningballbearingsCylindricalboreTaperedboreSealedKTaper1:122RS120,1301200,13002200,2300(11200,11300extendedinnerringtype)22002RS23002RSSphericalouterringracewayallowsself-alignment,accommodatingshaftorhousingdeflectionandmisalignedmountingconditions.Taperedboredesigncanbemountedreadilyusinganadapter.4.CylindricalrollerbearingsSingle-rowDouble-rowFour-rowNUNJNUPNNFNHNNUNNMainlyuseonrollingmillrollneckNU1000,NU200(R),NU300(R),NU400NU2200(R),NU2300(R)NU3200,NU3300CylindricalboreNNU4900NNU4900KTaperedboreNN3000NN3000K(FC),(4CR)Sincethedesignallowinglinearcontactofcylindricalrollerswiththeracewayprovidesstrongresistancetoradialload,thistypeissuitableforuseunderheavyradialloadandimpactload,aswellasathighspeed.NandNUtypesareidealforuseonthefreeside:theyaremovableintheshaftdirectioninresponsetochangesinbearingpositionrelativetotheshaftorhousing,whicharecausedbyheatexpansionoftheshaftorimpropermounting.NJandNFtypescanaccommodateaxialloadinonedirection:andNHandNUPtypescanaccommodatepartialaxialloadinbothdirections.Withseparableinnerandouterring,thistypeensureseasymounting.Duetotheirhighrigidity,NNUandNNtypesarewidelyusedinmachinetoolspindles.5.TaperedrollerbearingsSingle-rowDouble-rowFour-rowTDOtypeTDItypeMainlyusedonrollingmillrollnecks(Standardcontact(Intermediate(Steepangle)32900JR30200JR32000JR32200JR33000JR33200JR33100JR30300JR32300JRcontactangle)30200CR32200CR30300CR32300CRcontactangle)30300DJ30300DJR31300JR4620046200A4630046300A(46T)4520045300(45T)372004720047300(47T)Single-rowbearingscanaccommodateradialloadandaxialloadinonedirection,anddouble-rowbearingscanaccommodateradialloadandaxialloadinbothdirections.Thistypeofbearingissuitableforuseunderheavyloadorimpactload.Bearingsareclassifiedintostandard,intermediateandsteeptypes,inaccordancewiththeircontactangle.Thelargerthecontactangleis,thegreaterthebearingresistancetoaxialload.Itemssizedininchesarestillwidelyused.6.SphericalrollerbearingsConvexasymmetricalrollertypeConvexsymmetricalrollertypeTaperedboreR,RRRH,RHRRHAKorK3023900R,23000R(RH,RHA),23100R(RH,RHA),22200R(RH,RHA),21300R(RH)24000R(RH,RHA),24100R(RH,RHA),23200R(RH,RHA),22300R(RH,RHA)Sphericalrollerbearingscomprisingbarrel-shapedconvexrollers,double-rowinnerringandouterringareclassifiedintothreetypes:R(RR),RH(RHR)andRHA,accordingtotheirinternalstructure.Withthebearingdesignedsuchthatthecirculararccenteroftheouterringracewaymatcheswiththebearingcenter,thebearingisself-aligning,insensitivetoerrorsofalignmentoftheshaftrelativetothehousing,andtoshaftbending.Thistypecanaccommodateradialloadandaxialloadinbothdirections,whichmakesitespeciallysuitableforapplicationsinwhichheavyloadorimpactloadisapplied.Thetaperedboretypecanbeeasilymounted/dismountedbyusinganadapterorwithdrawalsleeve.7.NeedlerollerbearingsNeedlerollerandcageassembliesSingle-rowDouble-rowRS,R,RPRV,V,VSVP,VPSWR,WRSWRPWVDrawncupneedlerollerbearingsWithopenendsWithclosedendFullcomplementtypeBM,BHMYMFullcomplementtypeMMWithcageBTMBHTMBFNMBKMWithcageMKMMHKMMachinedringneedlerollerbearingsSingle-rowDouble-rowWithinnerringWithoutinnerringSealedWithinnerringWithoutinnerringNA4900NA5900(NQI,NQIS)RNA4900RNA5900(NQ,NQS)NA4900UUNA6900RNA6900Inspiteoftheirbasicstructure,whichisthesameasthatofNUtypecylindricalrollerbearings,bearingswithminimumringsectionsofferspacesavingsandgreaterresistancetoradialload,byusingneedlerollers.Bearingswithnoinnerringsfunctionusingheat-treatedandgroundshaftsastheirracewaysurface.NeedlerollerthrustbearingsNeedlerollerandcageassembliesThinplateraceThickplateraceTVTPWWSTrackrollersStudtype(camfollowers)Yoketype(rollerfollowers)Fullcomplementtype