Wheel bearing apparatus for a vehicle

A vehicle wheel bearing apparatus comprising:

• an outer member integrally formed with double row outer raceway surfaces on its inner circumference;
• an inner member formed with double row inner raceway surfaces on its outer circumference, the double row inner raceway surfaces are arranged opposite to the double row outer raceway surfaces;
• double row rolling elements are rollably contained, via cages, between the double row inner raceway surfaces and the double row outer raceway surfaces of the inner member and the outer member;
• a wheel mounting flange is integrally formed on a driving side of the inner member and outer member for mounting a wheel via a brake rotor, a cylindrical pilot portion extends toward the outer side from a base of the wheel mounting flange to guide and support the brake rotor;
• a plurality of hub bolts are press fit onto the wheel mounting flange equidistantly along an outer periphery of the wheel mounting flange;
• at least one through aperture is formed on the wheel mounting flange, at least one hollow pin, with a chamfered portion, is press-fit into the through aperture, the brake rotor is formed with through apertures to receive the plurality of hub bolts of the wheel mounting flange, the brake rotor further comprising at least one insert aperture, receiving the at least one hollow pin, is at a position respectively corresponding to the plurality of hub bolts and the at least one hollow pin, a chamfered portion is formed on an inner side of the at least one insert aperture of the brake rotor and a dimension from the outer side surface of the wheel mounting flange to the chamfered portion of the pin is set so that it is larger than a dimension of the chamfered portion of the brake rotor, the brake rotor is temporarily mounted on the wheel mounting flange by inserting or press-fitting the chamfered end side of the at least one hollow pin into the at least one insert aperture.