| 摘要 |
A wheel bearing apparatus has an outer member, an inner member and double row rolling elements. A coupler ring is fit onto the wheel hub. The coupler ring inner circumferential splined portion has a plurality of spline recesses and spline projections. The plurality recesses and projections mate with a hub splined portion formed on the inner side outer circumference of the cylindrical portion of the wheel hub. An axial cross-section of the inner-side end of each spline projection of the hub splined portion is formed by a single circular arc with a predetermined radius of curvature“R”. The radius of curvature“R”is larger than a dimension“A”, measured from the inner-side end face of the coupler ring to the inner-side edge“B”of each spline projection (R>A). Also, it is larger than the height“h”of each spline projection (R>h). |
