Patent ID: 7766554

Claim:
A wheel rolling bearing apparatus comprising: a drive shaft including a larger-diameter portion formed at an inner side portion thereof and a smaller-diameter portion formed at an outer side portion thereof; an inner shaft mounted on an outer periphery of the smaller-diameter portion through a spline; and an inner ring for a rolling bearing, mounted on an outer periphery of the inner shaft from an inner side, wherein the drive shaft, the inner shaft and the inner ring are assembled together so that an inner side surface of the inner ring abuts against an outer side surface of the larger-diameter portion, and the drive shaft is pressed toward the outer side relative to the inner shaft, and wherein abutting portions of the side surfaces, abutting against each other, of the inner ring and the larger-diameter portion are formed respectively into such shapes that a pressure contact distribution obtained at the abutting surfaces by the pressing of the drive shaft is made generally uniform.