>> P.70
B3■TypesNumerousvarietiesofShellTypeNeedleRollerBearingsareavailableasshowninTable1.ShellTypeCagedNeedleRollerBearingsStandardtypeThistypehasanarrowgapbetweentheboreofthemarked-sideflangeoftheouterring(brand,bearingnumber,etc.aremarked)andtheshaft,whichpre-ventsgreaseleaksandtheentryofforeignparticles.Thistypehaswideapplications.ClosedendtypeThistypeiscompletelyclosedononesideoftheouterring,andisidealforusewhenperfectclosingofshaftendsisdesired.Theshapeoftheclosedendsurfaceoftheouterringisdividedintotwotypes,andthedimensionst1andt2intheillustrationsshowninthedimensiontablesapplytothebearingswiththerollersetborediame-ters,Fw>22andFw≦22,respectively.TypewithsealsatbothsidesThistypehasawiderouterringthanthestandardtypeandisinstalledwithsealsconsistingofarein-forcingringandspecialsyntheticrubbertopreventgreaseleaksandtheentryofforeignparticles.ShellTypeGreaseRetainedFullComplementNeedleRollerBearingsThistypehasfullcomplementrollerswhichextendtothefullwidthoftheouterringraceway.Itcan,there-fore,withstandheavybearingloadsandismostsuit-ableforlowandmediumrotationalspeedsaswellasrockingmotions.Aslubricatinggreaseisprepackedwiththerollers,thebearingcanbeoperatedimmedi-atelyafterbeingfitted.Table1TypeofbearingTypeSeriesMetricseriesInchseries-Heavyduty-HeavydutyTLA … ZTA … ZBA … ZBHA … ZTLAMTAMBAMBHAMTLA … UU---YTLYTYBYBHCagedFullcomplementStandardClosedendWithseals(1)GreaseretainedNote(1)hentheheavydutytypewithsealsortheclosedendtypewithonesealisrequired,pleaseconsultIKO.Remark"W"isaddedtothemodelcodetoindicatethattherollingelementsareofthedouble-rowtype. ExampleTAW5045Z■IdentificationNumberTheidentificationnumberofShellTypeNeedleRollerBearingsconsistsofamodelcodeanddimensions.Examplesofthearrangementareshownbelow.Whenusingwithinnerrings,theassembledinnerringsshowninthedimensiontablesareused.Anexampleinthiscaseisalsoshownbelow.Innerringsaredeliveredseparately.■AccuracyTheouterringsofShellTypeNeedleRollerBearingsarethinandthereforecannotavoiddeformationduetoheattreatment.Itisthusnotappropriatetotakedirectmeasurementsofthebearing.Therollersetborediameterismeasuredusingapluggaugeortaperedgaugeafterpress-fittingthebearingtoasuit-ableringgauge.ThegaugespecificationsareshowninTables2.1and2.2.TolerancesofouterringwidthCareshowninTable3.ModelcodeDimensionsTA18ZTypeofbearing20Examplesofidenti(cid:16)cationnumberExample1Example2(Withinnerring)IdentificationnumberofInnerRingTA1820ZIRT1520+IdentificationnumberofShellTypeNeedleRollerBearingOuterringwidth(20mm)Rollersetborediameter(18mm)
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