Patent ID: 7748909

Claim:
A vehicle wheel bearing apparatus comprising: an outer member formed with a body mounting flange on its outer circumference and with a double row outer raceway surface on its inner circumference; an inner member including a wheel hub and an inner ring, the wheel hub having an integrally formed wheel mounting flange at one end and on the inner member outer circumference it has a base portion forming a seal land portion and an adjacent one inner raceway surface arranged opposite to one of the double row outer raceway surfaces, a cylindrical portion axially extends from the inner raceway surface, the inner ring fits onto the cylindrical portion of the wheel hub via a predetermined interference, and said inner ring outer circumference includes the other inner raceway surface arranged opposite to the other of the double row outer raceway surfaces and a substantially conical recess is formed at an outer side end portion of the wheel hub depth of the recess extends to at least near the bottom of the inner raceway surface of the wheel hub; double row rolling elements are freely rollably contained between the outer and inner raceway surfaces, respectively, of the outer member and the inner member; outer side rolling elements of the double row rolling elements are balls and inner side rolling elements of the double row rolling elements are tapered rollers; a pitch circle diameter of the inner side tapered rollers is set smaller than that of the outer side balls; and a portion of the wheel hub defined on one side from said base portion to and including the one inner raceway surface and on the other side by a wall on an inner surface defined by said conical recess, said portion of the wheel hub has a thickness between said one side and the other side, said thickness being substantially constant along the portion of the wheel hub that is defined on the one side from said base portion through said inner raceway surface and on the other side by the wall on the inner surface of the conical recess.