Patent ID: 8480306

Claim:
A bearing unit for driving wheels including: an outer member having a plurality of outer races in an inner periphery thereof; an inner member having a hub provided with a flange for mounting a wheel and a plurality of inner races opposed to the outer races; a plurality of rows of rolling elements arranged between the outer races and the inner races opposed to each other; and an out-board side constant velocity universal joint having an outer joint member, wherein a male portion is provided on one of the hub and the outer joint member, the male portion being formed as a rugged surface having a plurality of projections extending in an axial direction, wherein a female portion is provided on the other of the outer joint member and the hub and differs in configuration from the male portion, wherein the male portion is press-fitted into the female portion, along the axial direction, whereby a plurality of recesses fitting to the projections are formed in the female portion by entailing a plastic flow of the female portion with the press-fitting, such that a fitting portion for joining the hub and the outer joint member is formed between the projections and recesses, and wherein the fitting portion is completed by the press-fitting of the male portion into the female portion along the axial direction.