>> P.283
H■StructureandFeaturesInnerRingsareheat-treatedandIKOfinishedbygrindingtoahighdegreeofaccuracy.Inthecaseofneedlerollerbearings,normally,theshaftsareheat-treatedandfinishedbygrinding,andusedastheracewaysurfaces.However,whenitisimpossibletothespecifiedsur-makeshaftsurfacesaccordingtofacehardnessorsurfaceroughness,innerringsareused.InnerringsincludethoseforShellTypeNeedleRollerBearingsandthoseforgeneraluseandareavailableinavarietyofdimensions.Whenshaftsmoveaxiallyorsealsareusedadjacenttobearings,wideinnerringscanbeselected.Innerringscanalsobeusedeconomicallyasbush-ingswithoutrequiringanyadditionalmachining.■TypesForInnerRings,thetypesshowninTable1areavail-able.Table1.1InnerRingsforShellTypeNeedleRollerBearingsSeriesModelcodesofassembledbearingsMetricseriesInchseriesRemarkForIRTIRBTA … Z,TLA … ZTAM,TLAM,YT,YTLBA … Z,BHA … ZBAM,BHAM,YB,YBHInnerRingsforShellTypeNeedleRollerBearingswithSeal,pleaseconsultIKO.Table1.2InnerRingsforGeneralUsageSeriesModelcodesofassembledbearingsMetricseriesLRTLRTZInchseriesLRBLRBZ … BRNA49,RNA69RNA48,TAF,TRRNAF,NAX,NBXRNA49 … UU,RNA69 … UUGTRBRBR … UUShapesofInnerRingsGentletaperreliefSmallchamferGentletaperreliefSmallchamferH2
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