Wheel Bearing Apparatus And Its Manufacturing Method

摘要

A wheel bearing apparatus has an outer member, an inner member and double row rolling elements freely rollably contained between double row inner raceway surfaces and outer raceway surfaces of the inner member and the outer member. A plurality of bolt insertion bores, that fastening bolts pass through to fasten to the knuckle, are formed on the body mounting flange at plurality of positions circumferentially along the body mounting flange. The outer member is previously formed by hot forging. A seating surface for the fastening bolts is formed on an outboard-side surface of the body mounting flange by cold forging.

主权项

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, the outer member inner circumference 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 a knuckle, are formed on the body mounting flange at plurality of positions circumferentially along the body mounting flange, the outer member is previously formed by hot forging; a seating surface of the fastening bolts is formed on an outboard-side surface of the body mounting flange by cold forging.