主权项 |
1. A wheel bearing apparatus comprising:
an outer member integrally formed with a body mounting flange on its outer circumference, the body mounting flange adapted to be mounted on a knuckle of a suspension apparatus, the outer member inner circumference includes double row outer raceway surfaces; an inner member includes a wheel hub and at least one inner ring, the wheel hub is integrally formed with a wheel mounting flange on its one end, a cylindrical portion axially extends from the wheel mounting flange, the inner rings are press-fit onto the cylindrical portion of the wheel hub, via a predetermined interference, the inner rings outer circumferences are formed with inner raceway surfaces that correspond to the outer raceway surfaces of the outer member; double row rolling elements are freely rollably contained between the inner and outer raceway surfaces of the inner and outer members, via cages; a hardened ring-shaped gear member is mounted on an end of the cylindrical portion of the wheel hub, the gear member is formed with a gear portion on its outer circumference and with a splined portion on its inner circumference, the splined portion engages a hub-splined portion formed on the outer circumference of the cylindrical portion of the wheel hub; a contacting surface of the gear member and a contacting surface of the inner ring that abut against each other are ground; and the inner rings are axially immovably secured to the wheel hub under a condition where a predetermined amount of a bearing pre-stress is applied to the inner rings, via the gear member. |