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H■Structure and FeaturesIKO Inner Rings are heat-treated and finished by grinding to a high degree of accuracy. In the case of needle roller bearings, normally, the shafts are heat-treated and finished by grinding, and used as the raceway surfaces. However, when it is impossible to make shaft surfaces according to the specified sur-face hardness or surface roughness, inner rings are used.Inner rings include those for Shell Type Needle Roller Bearings and those for general use and are available in a variety of dimensions. When shafts move axially or seals are used adjacent to bearings, wide inner rings can be selected.Inner rings can also be used economically as bush-ings without requiring any additional machining.■TypesFor Inner Rings, the types shown in Table 1 are avail-able. Table 1.1 Inner Rings for Shell Type Needle Roller BearingsSeries Model codes of assembled bearingsMetric seriesInch seriesIRTIRBTA … Z,TLA … ZTAM,TLAM,YT,YTLBA … Z,BHA … ZBAM,BHAM,YB,YBHRemark For Inner Rings for Shell Type Needle Roller Bearings with Seal, please consult IKO.Table 1.2 Inner Rings for General UsageSeriesModel codes of assembled bearingsMetric seriesInch seriesLRTLRTZLRBRNA 49,RNA 69RNA 48,TAF,TRRNAF,NAX,NBXRNA 49 … UU,RNA 69 … UUGTRBRLRBZ … BBR … UUShapes of Inner RingsGentle taper reliefSmall chamferGentle taper reliefSmall chamferH2
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