Wheel Bearing Apparatus

摘要

A wheel bearing apparatus has an outer member, an inner member and double row rolling elements contained between the outer member and the inner member. A first cap is press-fit into an inboard-side opening of the outer member. The first cap has a cylindrical fitting portion press-fit into an inside fitting surface of the outer member. A bottom portion extends radially inward from the fitting portion to cover the inboard-side end of the inner member. An elastic member is integrally adhered onto an inboard-side outer circumference of the fitting portion of the first cap. The elastic member projects radially outward beyond the outer diameter of the fitting portion. A retracted surface is formed on an inboard-side from the inside fitting surface, via a step portion. The retracted surface has a larger diameter than that of the inside fitting surface. The elastic member press-contacts against the retracted surface while being elastically deformed.

主权项

1. A wheel bearing apparatus comprising:
an outer member integrally formed with a body mounting flange on its outer circumference, the body mounting flange is to be mounted on a body of a vehicle, the outer member inner circumference including double row outer raceway surfaces; an inner member including a wheel hub and at least one inner ring, the wheel hub is integrally formed, on its one end, with a wheel mounting flange, a cylindrical portion axially extends from the wheel mounting flange, the inner ring is press-fit onto the cylindrical portion of the wheel hub, the inner member outer circumference includes double row inner raceway surfaces opposing the double row outer raceway surfaces; double row rolling elements are contained between the outer raceway surfaces and inner raceway surfaces, respectively, of the outer member and the inner member; a seal mounted is in an outboard-side annular opening formed between the outer member and the inner member; and a first cap press-fit into an inboard-side opening of the outer member, the first cap comprising a cylindrical fitting portion press-fit into an inside fitting surface of the outer member, a bottom portion extending radially inward from the fitting portion to cover the inboard-side end of the inner member, an elastic member is integrally adhered to an inboard-side outer circumference of the fitting portion of the first cap, the elastic member is formed from synthetic rubber and vulcanized adhered to the first cap, the elastic member projecting radially outward beyond the outer diameter of the fitting portion; the inner circumference of the inboard-side end of the outer member is formed with an inside fitting surface, the first cap is press-fit into the inside fitting surface, a retracted surface is formed on an inboard-side from the inside fitting surface, via a step portion, the retracted surface has a larger diameter than that of the inside fitting surface; and the elastic member press-contacts against the retracted surface while being elastically deformed.