Patent ID: 9573419
Date: 2017-02-21
CPC Classifications: B21K,B60B,F16C

Claim:
1. A wheel bearing apparatus comprising: an outer member formed with a body mounting flange on its outer circumference, the body mounting flange is to be mounted on a knuckle, an inner circumference of the outer member includes double row outer raceway surfaces; an inner member is formed with double row inner raceway surfaces on its outer circumference, the double row inner raceway surfaces oppose, respectively, one of the double row outer raceway surfaces; double row rolling elements are freely rollably contained between the double row inner raceway surfaces and the outer raceway surfaces of the inner member and the outer member; a plurality of bolt insertion bores, that fastening bolts are inserted into to fasten to the knuckle, are formed on the body mounting flange at a plurality of positions circumferentially along the body mounting flange, the outer circumference of the outer member has a hot forged skin; a seating surface of the fastening bolts is formed on an outboard-side surface of the body mounting flange with the seating surface having a cold forged skin.