Bearing device for driving wheel

摘要

A driving-wheel bearing device includes an outer race having double-row outer raceway surfaces formed on an inner periphery thereof, a hub wheel and an inner race having a wheel attachment flange at one end thereof and double-row inner raceway surfaces on an outer periphery thereof, and double-row rolling elements interposed between the outer raceway surfaces of the outer race and the inner raceway surfaces of the hub wheel and the inner race, the hub wheel having a shaft hole into which a stem section extending from an outer joint member of a constant velocity universal joint is spline-fitted by being press-fitted, in which a plate having a molybdenum coating layer or a fluorine-resin coating layer formed thereon and having a plate thickness ranging from 0.5 mm to 2 mm is interposed between opposite surfaces of a shoulder portion of the outer joint member and an crimped portion of the hub wheel.

主权项

1. A driving-wheel bearing device, comprising:
an outer member having a shoulder portion, and double-row outer raceway surfaces on an inner periphery thereof; an inner member comprising a hub wheel and an inner race, the inner member having a crimped end portion, a wheel attachment flange at one end thereof and double-row inner raceway surfaces on an outer periphery thereof; and double-row rolling elements interposed between the double-row outer raceway surfaces of the outer member and the double-row inner raceway surfaces of the inner member, wherein the hub wheel has a shaft hole into which a stem section extending from an outer joint member of a constant velocity universal joint is capable of being spline-fitted by being press-fitted, wherein a plate having predetermined sliding properties is interposed between opposite surfaces of a shoulder portion of the outer joint member and the crimped end portion of the inner member, wherein claw-like protrusions are provided on an inner periphery of the plate, wherein an inner end portion of each of the claw-like protrusions is formed in a shape of being bent to the crimped end portion of the inner member, wherein an inner diameter d1 corresponding to the claw-like protrusions of the plate is bigger than an outer diameter D2 of a portion to which the inner periphery of the plate is fitted, and wherein an inner diameter of the inner periphery of the plate other than where the claw-like protrusions are located is bigger than the inner diameter d1 corresponding to the claw-like protrusions.