Patent ID: 8192088
Filing Date: 2012-06-05
Classification: B60B,F16C,Y10T

Abstract:
1. A wheel support bearing assembly which comprises: an outer member having an inner periphery formed with double row outer rolling surfaces, an inner member formed with double row inner rolling surfaces opposed to the respective outer rolling surfaces; double row rolling elements rollingly accommodated between the respective rolling surfaces of the outer and inner members; and a wheel mounting flange formed integrally with one of the outer and inner members; wherein at least one of the outer and inner members, which is formed with the wheel mounting flange referred to above, is thermally refined or air cooled after having been forged; the respective rolling surfaces of the outer and inner members are hardened to a predetermined surface hardness; the inner member including a hub unit having an inner diametric portion formed with torque transmitting serrations of an arcuate sectional shape represented by a groove bottom defined between the neighboring serrations; and the radius of curvature of the arcuate shape represented by the groove bottom between the neighboring serrations is regulated to a value within the range of 0.2 to 0.8 mm.