Patent ID: 7497631
Filing Date: 2009-03-03
Classification: B60B,F16C

Abstract:
1. A bearing apparatus for a wheel of vehicle comprising: an outer member having an integrally formed body mounting flange and double row outer raceway surfaces formed on an inner circumferential surface; an inner member including a wheel hub having a wheel mounting flange integrally formed at one end, one inner raceway surface being formed on an outer circumferential surface of the wheel hub opposite to one of the double row outer raceway surfaces, and a cylindrical portion of the wheel hub axially extending from the inner raceway surface through a shoulder, an inner ring fitted onto the cylindrical portion with one end of the inner ring abutting the shoulder of the wheel hub and said inner ring formed with the other inner raceway surface on its outer circumferential surface, said other inner raceway surface opposite to the other outer raceway surface of the double row outer raceway surfaces; double row rolling elements freely rollably contained, via a cage, between the inner and outer raceway surfaces, respectively, of the inner and outer members; and a corner between the shoulder of the wheel hub and the cylindrical portion is defined by a compound curve comprising a plurality of radii of curvatures and a radius of curvature of an outboard side is smaller than a radius of curvature of an inboard side of said compound curve.