Patent ID: 9505266
Filing Date: 2016-11-29
CPC Classification: B60B,F16C,F16D

Claim Text:
1. A wheel bearing device comprising: an outer member having double-row outer raceway surfaces; an inner member having double-row inner raceway surfaces; a plurality of rolling elements arranged between the double-row outer raceway surfaces of the outer member and the double-row inner raceway surfaces of the inner member; and an outer joint member having a shaft section formed therein, wherein the inner member has a hub wheel having a hole and a flange for attachment to a wheel, the shaft section of the outer joint member is inserted in a fitting manner into the hole of the hub wheel and is coupled to the hub wheel, an axially extending projection is provided on an outer diameter surface of the shaft section of the outer joint member, the axially extending projection being press-fitted along an axial direction into an initial recess provided on an inner diameter surface of the hole of the hub wheel, and a recess is formed in the hole of the hub wheel by the press-fitting of the projection, to thereby form a recess-projection fitting structure in which the projection and the recess are held in close contact with each other over an entire region of fitting contact regions therebetween, the initial recess has a volume that is smaller than a volume of the recess, a surface of the recess is a cut face formed by removing material including the initial recess by the press-fitting of the projection, and a shaft section press-fitting guide structure for guiding the projection during press fitting of the shaft section to the hole of the hub wheel is provided on a projection press-fitting start side of the hole of the hub wheel.