Patent ID: 7721987

Claim:
A roller clutch configured to transmit rotation in only one direction, comprising: an outer ring having an inner peripheral surface; an inner ring having an outer peripheral surface, the inner ring being disposed on the inner peripheral side of the outer ring; a plurality of rollers disposed between the inner ring and the outer ring at predetermined intervals in a circumferential direction, the plurality of rollers being allowed to frictionally engage the outer ring and the inner ring while being interposed there between; a retainer having a plurality of holding portions, a plurality of shaft portions, and a washer plate-shaped attachment portion, the washer plate-shaped attachment portion being a flat ring shaped portion, the plurality of holding portions being disposed among the plurality of rollers, the plurality of shaft portions protruding from the plurality of holding portions toward the plurality of rollers, the holding portions protruding from an inner peripheral part of the attachment portion to a center of the attachment portion, the shaft portions being integrally formed with the holding portions; a cam surface formed either on the outer peripheral surface or the inner peripheral surface, the cam surface having an oblique surface, the oblique surface being arranged to contact the outer peripheral surface of the roller; and a spring member disposed on outer peripheral side of each of the plurality of shaft portion, the spring member being configured to urge the plurality of rollers in a direction such that the plurality of rollers frictionally engage the cam surface.