Patent ID: 8109578

Claim:
A wheel hub comprising: a flange for mounting a brake rotor, which flange is formed to face radially outward, and a plurality of bolt holes formed in the flange, wherein a plurality of bolts for mounting the brake rotor are press fitted and secured in the bolt holes, each bolt hole including a widening portion, which is tapered to widen from a center portion of the bolt hole to a brake rotor mounting surface of the flange, the widening portion being formed by two tapered surfaces comprising different taper angles with respect to an axis of the bolt hole from an opening rim of the bolt hole toward an inside of the bolt hole, and the taper angle of an outer tapered surface connected to the opening rim is greater than the taper angle of an inner tapered surface connected to the outer tapered surface, the outer tapered surface being formed along an entire circumference of the bolt hole and the taper angles comprising angles such that the inner tapered surface comprises an increasing diameter in the axial direction and the outer tapered surface comprises an increasing diameter in the axial direction, and wherein an axially innermost side of the outer tapered surface is disposed radially outward of an axially innermost side of the inner tapered surface.