>> P.33
AccuracyThe accuracy of IKO Needle Roller Bearings conforms to JIS B 1514-1~-3 (Rolling bearings - Tolerances of bearings), and the dimensional accuracy and rotation-al accuracy are specified. The specified items are shown in Fig. 11.Needle Roller Bearings are classied into 4 classes of accuracy. These classes are represented by the numbers 0, 6, 5 and 4, written in order of increasing accuracy.Table 12 shows the accuracy for the inner rings of radial bearings, Table 13 shows the accuracy for the outer rings of radial bearings, Table 14 shows the tol-erances for the smallest single roller set bore diame-ter of radial bearings, and Table 15 shows the permis-sible limit values of chamfer dimensions of radial bearings. For thrust bearings, see the section on accuracy of Thrust Bearings. Note that the series of Shell Type Needle Roller Bearings, Roller Bearings, Cam Followers, Roller Followers, Combined Type Needle Roller Bearings, and Crossed Roller Bearings have special accuracy. For further details, see the section on accuracy of each bearing series.RemarksThe meanings of the new symbols for quantities used for accuracy of radial bearings are as follows:①∆ represents the deviation of a dimension from the specied value.②V represents the variation of a dimension.③s, m, and p represent a single (or actual) measurement, a mean measurement, Suffixes and a measurement in a single radial plane, respectively.[Example] Vdp means largest and the the difference between the smallest of the bore diameters in a single radial plane (circularity). Vdmp means the difference between the largest and the smallest of the single plane mean bore diameters (cylindricity).Accuracy of boundary dimensionsDeviation of boundary dimensionsVariation of boundary dimensionsAccuracy of bearingsRotationalaccuracySingle bore diameter deviation ∆dsSingle plane mean bore diameter deviation ∆dmpSingle outside diameter deviation ∆DsSingle plane mean outside diameter deviation ∆DmpDeviation of a single inner ring width BsDeviation of a single outer ring width ∆CsBore diameter variation in a single radial plane Vdsp Mean bore diameter variation VdmpOutside diameter variation in a single radial plane VDspMean outside diameter variation VDmpInner ring width variation VBsOuter ring width variation VCsRadial runout of assembled bearing inner ring KiaAssembled bearing inner ring face runout with raceway Sia Inner ring reference face runout with bore Sd Radial runout of assembled bearing outer ring KeaAssembled bearing outer ring face runout with raceway SeaVariation of outside surface generatrix inclination with outer ring reference face SDFig. 11 Accuracy of bearingsA30ABCDEFGHIJKLM
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