WHEEL BEARING APPARATUS AND AXLE MODULE

摘要

Provided are a low-cost wheel bearing apparatus and an axle module with which the number of processing steps and assembly steps can be reduced, and with which component replacement fees and repair costs can be reduced. A projection extending in the axial direction is provided on the outer diameter surface of the shaft part of an outer joint member or the inner diameter surface of the hole part in the hub ring. The projection is pressed to the other side in the axial direction. A recess is formed that fits tightly with said projection on the other side as a result of said pressing, and a projection-recess fitting structure is formed, wherein the projection and the recess are in close contact over the entire area at which they are fitted together. The external member is fitted by a predetermined joining to a vehicle knuckle hole. An annular groove is formed in both the outer peripheral surface of the external member and the inner peripheral surface of the knuckle hole, and a retaining ring is engaged in both annular grooves. The external member can be separated from the knuckle only as a result of deformation or breakage of the retaining ring caused by a pulling force that is greater than the pulling forces that act during normal operation.