WHEEL BEARING DEVICE

摘要

Provided is a wheel bearing device which is intended to have a light weight and a low cost by reducing its material loss. A hub wheel (1) having a wheel mounting flange (6) at its one end portion comprises a brake pilot portion (13) extending to the outer side from the root portion of the wheel mounting flange (6), for guiding the bore face of a brake rotor, and a wheel pilot portion (14) extending further to the outer side from that brake pilot portion (13), for guiding the bore face of the wheel. This wheel pilot portion (14) is constituted of a plurality of divided pilots (15), which are divided equally in the circumferential direction. Of the circumferential end faces of the divided pilots (15), at least the end faces (15a) on the machined terminal end face are forged on their leading end sides to form chamfered portions (16). These chamfered portions (16) have a predetermined inclination angle (a) with respect to the axial end faces (17) of the divided pilots (15) after machined. At the machining time, therefore, the step of deburring the divided pilots (15) can be eliminated to lower the cost.