Patent ID: 8142081

Claim:
A wheel support bearing assembly to be connected with a constant velocity joint, comprising: an outer member having an inner periphery formed with double row raceway surfaces; an inner member having an outer periphery formed with raceway surfaces opposed to those raceway surfaces of the respective rows; and double row balls interposed between those opposed raceway surfaces, wherein the inner member is made up of a hub unit, which has a wheel mounting flange defined in an outer periphery of an outboard end thereof and also has a center bore defined in a center portion thereof, and an inner ring mounted on an inner ring mounting area, which is defined in the outer periphery of the inboard end of the hub unit and is so configured as to represent an annular recess, the raceway surfaces of the respective rows are formed in the hub unit and the inner ring; a shoulder is defined to indent in an inner peripheral edge of an inboard end face of the inner ring, a crimped portion, engageable with an axially oriented stepped face of the shoulder in the inner ring, is provided in the inboard end of the hub unit by diameter expansion, the crimped portion of the hub unit is formed by crimping such diameter expanded portion which is thin walled by providing a hub inner diameter setback in the inboard end of the hub unit, and this thin walled portion as a whole is positioned on a side inboardly of the straight line defining a ball contact angle in the inboard raceway surface, and a stem portion of the constant velocity joint is inserted into the center bore of the hub unit and a stepped face is provided in the constant velocity joint so as to orient in the outboard direction, the stepped face being urged against the inboard end face of the inner ring, to thereby constrain the inner member between the constant velocity joint and a nut threadingly mounted on a free end of the stem portion.