Patent ID: 7832939

Claim:
A bearing apparatus for a wheel comprising a rolling bearing for rotatably supporting a wheel relative to a body of a vehicle having double row rolling elements arranged between an inner member and an outer member; a wheel mounting flange formed on either the inner member or the outer member for fastening thereon the wheel via a brake rotor; characterized in that one side of the wheel mounting flange is cut to form an annular groove, and is initially cut into the side of the wheel mounting flange, hub bolts are press fit into said plurality of apertures formed in said groove providing a plurality of hub bolts studded on the wheel mounting flange circumferentially along the periphery, and secondarily cut-finishing a surface initially cut after the press fit of the bolts; and at least a region of the wheel mounting flange positioned radially outward of the bolt apertures, toward the wheel side, is cut during said secondary cut finishing, said cut finishing inclining said at least region and said at least region defining a peripheral portion that is in intimate contact radially outwardly across the entire at least region with the brake rotor for reducing runout and said at least region of the wheel mounting flange positioned radially outward of the hub bolts is inclined and projects more toward the wheel side than an inner region of the wheel mounting flange positioned radially inward of the bolt apertures so that said at least region of the wheel mounting flange positioned radially outward of the hub bolts projects from the mounting flange so that said radially inner region of the wheel mounting flange and said at least region of the wheel mounting flange positioned radially outward of the hub bolts are not co-planar.