Patent ID: 8092097

Claim:
A retained roller assembly, which comprises: a roller retainer of a cylindrical shape having a plurality of pockets defined therein and arranged in a circumferential direction thereof, each of the pockets having side faces opposed to each other in the circumferential direction; rollers accommodated within the respective pockets; an inner diametric side roller retaining projection formed on an inner diametric side of an opening edge of each of the side faces, and an outer diametric side roller retaining projection formed on an outer diametric side of an opening edge of each of the side faces; and a roller guide face for guiding the corresponding roller, provided at an axial position of the side faces of each of the pockets that is different from axial positions of the associated roller retaining projections, wherein an annular recessed portion depressed radially outwardly relative to an intermediate portion in the axial direction is provided in axially opposed ends of an inner diametric surface of the retainer so as to deploy over the entire periphery of the retainer, and wherein an axially inner side end of each of the annular recessed portions is positioned on a side of an axially intermediate portion relative to the roller guide face and on a side of the roller guide face relative to the inner diametric side roller retaining projection.