Patent ID: 8002474

Claim:
A vehicle wheel bearing apparatus comprising: an outer member integrally formed with double row outer raceway surfaces on its inner circumference; an inner member including a wheel hub and at least one inner ring, said wheel hub is integrally formed on one end with a wheel mounting flange and on an other end with a cylindrical portion, the at least one inner ring is press fit onto the cylindrical portion of the wheel hub, the inner member is formed with double row inner raceway surfaces arranged opposite to the double row outer raceway surfaces; double row rolling elements are rollably contained between the double row outer and inner raceway surfaces; a constant velocity universal joint is torque transmittably inserted into the wheel hub and is axially separably connected by a securing nut, a shoulder of an outer joint member of the constant velocity universal joint abuts against a larger end face of the inner ring; the larger end face of the inner ring is formed as a ground surface and an end face of the shoulder of the outer joint member abutted against the larger end face is formed as a ground surface or a lathe-turned surface, and the surface roughness of at least the larger end face of the inner ring is limited to a range within 0.1˜0.3 microns.