An internal hub transmission for a bicycle

摘要

An internal hub transmission is provided for a bicycle comprising a driver member 11 rotatably mounted on a hub axle 2. A planetary gear mechanism 5 is coupled for selectively communicating rotational force from the drive member 11 to a hub body 4 through various force transmission paths, the transmission path being selected by means of a movable clutch member 26. A pawl body 22 is arranged between the drive member 11 and the clutch member 26, where the pawl body 22 carries a one-way clutch 20 so as to only transmit forward rotational drive force from the drive member 11 to the pawl body 22. Therefore when back pedaling, substantially no reverse rotational motion is transferred from the drive member 11 to the clutch member 26. <IMAGE>