WHEEL BEARING DEVICE

摘要

A bearing apparatus for a wheel of vehicle which can achieve easiness of assembly in an automatic assembling apparatus and greatly reduce the assembling steps. According to the present invention there is provided a bearing apparatus for a wheel of vehicle of a type of back-to-back double row tapered roller bearing comprising an outer member integrally formed on its outer surface with a body mounting flange to be mounted on a suspension apparatus of vehicle and also formed on its inner surface with double row outer raceway surfaces tapered open respectively axially inward and outward; an inner member including a hub wheel and an inner ring or an outer joint member of a constant velocity universal joint, the hub wheel having a wheel mounting flange integrally formed therewith at one end thereof and one inner raceway surface formed on the outer circumferential surface thereof arranged oppositely to one of the double row outer raceway surfaces and a cylindrical portion axially extending from said inner raceway surface, said inner ring or the outer joint member of a constant velocity universal joint being press fitted on the cylindrical portion and formed on its outer circumferential surface with the other inner raceway surface arranged opposite to the other raceway surface of the double row outer raceway surfaces; double row tapered rollers freely rollably held between the outer and inner raceway surfaces by cages; and seals arranged in annular openings formed by the outer and inner members at both ends thereof characterized in that said cages are formed of synthetic resin by injection molding; that posts between pockets of the cages are arranged to be positioned radially inward the pitch circle diameter of the tapered rollers; and that the width of an opening of radially inward of each pocket is set so that each tapered roller is held within the pocket with contacting tapered surfaces of the posts opened radially outward so as not to be fallen out radially inward.