Patent ID: 7635226

Claim:
A vehicle wheel bearing apparatus formed as a unit comprising: a wheel hub with a wheel mounting flange at its one end, a cylindrical portion extending from the wheel mounting flange via a shoulder portion; a wheel bearing formed by a double row rolling bearing press fit onto the cylindrical portion of the wheel hub, said wheel bearing including an outer member with double row outer raceway surfaces on an the inner circumferential surface; a pair of inner rings, formed with inner raceway surfaces, are arranged opposite to the double row outer raceway surfaces, the rings are press fit onto the cylindrical portion of the wheel hub via a predetermined interference, one ring abuts the shoulder portion; double row rolling elements are freely rollably contained between the opposed inner and outer raceway surfaces via cages, said inner rings are axially immovably secured by a caulked portion, the caulking portion is formed by plastically radially outwardly deforming the end portion of the cylindrical portion, said caulking portion in tight immediate contact with the end surface of the inner ring of an inner side of the wheel bearing apparatus, inner circumferential surfaces of one end of each of the inner rings is formed with a predetermined chamfer portion, and the chamfer portion of the inner ring of the inner side of the wheel bearing apparatus is smaller than the chamfer portion of the inner ring of an outer side of the wheel bearing apparatus.