Patent ID: 8047724

Claim:
A wheel bearing apparatus comprising: a roller bearing; an inner shaft including a center hole allowing insertion of a drive shaft, the inner shaft including an outer circumferential surface to which the roller bearing is installed; a coupler ring fixed to the inner shaft by caulking an inner side end portion of the inner shaft, the coupler ring receiving a transmission of a rotation from the drive shaft via a clutch member; and a cylindrical bearing member comprising a plurality of rollers, the cylindrical bearing member being arranged entirely within the center hole and rotatably supporting the drive shaft, wherein the cylindrical bearing member has an outer side portion located away from a vehicle inner side of the wheel bearing apparatus and an inner side portion located at a vehicle inner side of the wheel bearing apparatus, and wherein an inner wall of the center hole is configured to be spaced from a cylindrical outer circumference of the inner side portion of the cylindrical bearing member and to first engage the cylindrical outer circumference of the cylindrical bearing member at an intermediate position along the length of the plurality of rollers such that the cylindrical outer circumference of the outer side portion of the cylindrical bearing member is in engagement with the inner wall of the center hole, wherein a portion of the inner wall of the center hole opposing the inner side portion of the cylindrical bearing member is a conical surface expanding toward a vehicle inner side.