>> P.283
H2IKOInnerRingsareheat-treatedandfinishedbygrindingtoahighdegreeofaccuracy.Inthecaseofneedlerollerbearings,normally,theshaftsareheat-treatedandfinishedbygrinding,andusedastheracewaysurfaces.However,whenitisimpossibletomakeshaftsurfacesaccordingtothespecifiedsur-facehardnessorsurfaceroughness,innerringsareused.InnerringsincludethoseforShellTypeNeedleRollerBearingsandthoseforgeneraluseandareavailableinavarietyofdimensions.Whenshaftsmoveaxiallyorsealsareusedadjacenttobearings,wideinnerringscanbeselected.Innerringscanalsobeusedeconomicallyasbush-ingswithoutrequiringanyadditionalmachining.■StructureandFeaturesGentletaperreliefSmallchamferGentletaperreliefSmallchamferShapesofInnerRings■TypesForInnerRings,thetypesshowninTable1areavail-able.Table1.1InnerRingsforShellTypeNeedleRollerBearingsSeriesModelcodesofassembledbearingsMetricseriesInchseriesIRTIRBTA … Z,TLA … ZTAM,TLAM,YT,YTLBA … Z,BHA … ZBAM,BHAM,YB,YBHRemarkForInnerRingsforShellTypeNeedleRollerBearingswithSeal,pleaseconsultIKO.Table1.2InnerRingsforGeneralUsageSeriesModelcodesofassembledbearingsMetricseriesInchseriesLRTLRTZLRBLRBZ … BRNA49,RNA69RNA48,TAF,TRRNAF,NAX,NBXRNA49 … UU,RNA69 … UUGTRBRBR … UUH
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