Patent ID: 7857521

Claim:
A back-to-back double row tapered roller bearing comprising: an outer member integrally formed with a body mounting flange on an outer surface, the body mounting flange is to be mounted on a suspension apparatus of a vehicle, and said outer member formed, on an inner surface, with double row outer raceway surfaces tapered open respectively axially inward and outward and a cone back face rib at each outer raceway surface for guiding tapered roller elements on both said double row outer raceway surface; an inner member including a wheel hub and an inner ring or an outer joint member of a constant velocity universal joint, the wheel hub having a wheel mounting flange integrally formed at one end and one inner raceway surface formed on an outer circumferential surface arranged opposite to one of the double row outer raceway surfaces, 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 fit onto the cylindrical portion and formed, on an outer circumferential surface, with another 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; seals arranged in annular openings formed by the outer and inner members at both ends, said cages are formed of synthetic resin by injection molding; posts between pockets of the cages are arranged to be positioned radially inward of the pitch circle diameter of the tapered rollers; a width of an opening radially inward of each pocket is set so that each tapered roller is held within the pocket, contacting tapered surfaces of the posts are opened radially outward so that rollers do not fall out radially inward and said tapered surfaces are entirely tapered along said posts so that said rollers extend through said cage providing a gap between said cage and said inner member; and said cone back face ribs on said outer member prohibiting axial movement of said tapered rollers on both said outer raceway surface which, in turn, prohibits axial movement of said cages on said outer member, wherein said cages are prevented from contacting said seals secured to said outer member.