Patent ID: 7935019
Filing Date: 2011-05-03
Classification: B62M

Abstract:
1. A bicycle hub transmission comprising: a hub axle having a longitudinal guiding part that includes at least one serration on an outer peripheral surface of the hub axle; a driver rotatably supported relative to the hub axle; a hub shell rotatably supported relative to the driver, a planetary gear mechanism operatively disposed between the driver and the hub shell to selectively transmit rotational power from the driver to the hub shell through one a plurality of different power transmission paths, and a clutch arranged to actuate the planetary gear mechanism to select one a plurality of different gear ratios, the clutch includes at least one clutch plate which is non-rotatably supported by the hub axle and axially movable relative to the hub axle to selectively engage with and disengage from at least one sun gear of the planetary gear mechanism, and the at least one serration engages a correspondingly formed inner peripheral surface of the clutch plate.