Patent ID: 6702472
Filing Date: 2004-03-09
Classification: B60B,F16C

Abstract:
A wheel bearing device comprising:an outer member having a flange configured to be attached to a car body, an inner periphery, and two rows of raceway surfaces in the inner periphery; an inner member that comprises a hub ring wherein said hub ring comprises an end and a small-diameter stepped portion, a wheel-attaching flange, wherein said wheel-attaching flange comprises (a) an outer periphery with one raceway surface, (b) an inner ring fitted on the small-diameter stepped portion of the hub ring, and (c) a second raceway surface; two rows of rolling elements installed between the respective raceway surfaces of said inner and outer members, the end extending from the small-diameter stepped portion of said hub ring being crimped for inseparable integration; and wherein the end of said hub ring before being crimped is in the form of a hollow cylindrical portion and wherein the hollow cylindrical portion has a wall thickness that gradually increases towards a front end.