Unidirectional clutch for transmission in motor cycles

摘要

The unidirectional clutch (30) comprises an inner hub (31) and an external rim (33) disposed concentrically. The exterior rim (33) contains a body (34) having a mounting space (35) for the interior part (31), and clutch chambers (40) formed in the internal peripheral surface of the mounting hole at equal intervals in a circumferential direction. Each chamber is cut out in the form of a wedge orientated to the outside in a radial direction, to incorporate clutch rollers (43) fitted in and rotating in the respective clutch chambers. Springs (45) each push on one of the rollers in the direction of the smaller diameter part (41) of the clutch chamber. A receiving hole (45) is formed on the larger diameter side (42) of the chamber (40) for the spring (47) in which it bottoms to take the reaction and this hole is extended (44) on the other side of the clutch chamber (40) to allow the introduction of the spring.