Internal speed change hub for bicycle

摘要

An internal hub transmission for a bicycle comprises a hub axle (21) having an axle axis for retaining the transmission to a bicycle frame; a drive mechanism (22) rotable supported relative to the hub axle (21). A power transmission mechanism disposed between the driver (22) and the output member (23) for communicating rotational force of the driver (22) to the output member (23) through a plurality of transmission paths. An operation mechanism (25) is disposed at least partly in the hub axle (21) for movement in the direction of the axle axis to select among the plurality of transmission paths whereby an actuating mechanism is mounted on the hub axle (21) inboard of a free end of the hub axle for moving the operation mechanism (25) in the direction of the axle axis.