Patent ID: 7048341
Filing Date: 2006-05-23
Classification: B60B

Abstract:
1. A bearing device for an axle comprising: a hub wheel; a flange provided radially outwardly on an outer periphery of the hub wheel; and bolts having serrations provided at their heads, wherein the flange includes a plurality of through holes formed therein spaced in a circumferential direction of the flange such as to pass therethrough in an axial direction of the hub, the bolts being attached into the through holes, respectively, in a state where the serrations bite the through holes of the flange, and at least one annular groove reducing a biting amount of the serrations of the bolt being formed in inner peripheral surfaces of the through holes of the flange into which the bolts are attached prior to insertion of the bolts into the through holes, wherein the at least one annular groove includes at least two annular grooves that are independently provided in a biting region of the serration in the inner peripheral surface of the through hole in the axial direction.