Patent ID: 8556737

Claim:
A wheel bearing device, comprising: a constant-velocity universal joint including an outer joint member, the outer joint member including a shaft section; and a wheel bearing comprising an outer member having an inner periphery and double-row outer raceway surfaces on the inner periphery, an inner member having an outer periphery and double-row inner raceway surfaces on the outer periphery, and rolling elements arranged between the double-row outer raceway surfaces of the outer member and the double-row inner raceway surfaces of the inner member, wherein the inner member comprises a hub wheel having a wheel attachment flange protrudingly disposed on an outer diameter surface of the hub wheel, the hub wheel and the shaft section of the outer joint member of the constant-velocity universal joint being coupled to each other through intermediation of a recess-projection fitting structure, the shaft section being fitted and inserted in a hole of the hub wheel, wherein the recess-projection fitting structure includes projections extending in an axial direction on one of an outer diameter surface of the shaft section of the outer joint member and an inner diameter surface of the hole of the hub wheel, the projections being press-fitted in another of the outer diameter surface and the inner diameter surface along the axial direction, and recesses brought into contact and fitted with respect to the projections by the press fitting in the another of the outer diameter surface and the inner diameter surface, the projections and the recesses being held in contact with each other through intermediation of entire fitting contact regions, wherein the outer member is configured to fit in a hole of a knuckle of a vehicle with a predetermined fit, wherein an annular groove is disposed in an outer peripheral surface of the outer member, wherein the groove is configured to receive a snap ring, thereby preventing the outer member from slipping off from the knuckle when the outer member is fit into the hole of the knuckle by the snap ring being engaged with the annular groove in the outer member and an annular groove in an inner peripheral surface of the knuckle, wherein the outer member is configured to be separable from the knuckle only by deformation or breakage of the snap ring caused by application of a drawing force larger than a drawing force acting in normal use, and wherein the recesses have cut surfaces formed by the press-fitting of the projections.