Patent ID: 7891879
Filing Date: 2011-02-22
Classification: B21J,B60B,F16C,Y10T

Abstract:
1. A wheel hub of wheel bearing apparatus comprising: an outer member formed, on its inner circumference, with double row outer raceway surfaces; an inner member including a wheel hub and an inner ring, the wheel hub having a wheel mounting flange at one end, a shaft portion axially extending from a base of the wheel mounting flange toward the inner side of the wheel bearing apparatus, an inner raceway surface arranged opposite to one of the double row outer raceway surfaces formed on the outer circumference of the shaft portion, a cylindrical portion axially extending from the inner raceway surface, via a shoulder portion, toward the inner side of the wheel bearing apparatus, and a through bore formed on the wheel hub inner circumference with a serration for torque transmission, the inner ring press-fit onto the cylindrical portion abutting against the shoulder portion of the wheel hub and the inner ring formed, on its outer circumference, with another inner raceway surface arranged opposite to the other of the outer raceway surfaces; double row rolling elements contained between the inner and outer raceway surfaces of the inner member and the outer member; and fiber flow near the inner circumference of material forming the wheel hub from the shoulder to the open end surface of the wheel hub is in a condition substantially parallel to the axis of the wheel hub.