| 摘要 |
A bicycle hub transmission includes a hub axle, a driver rotatably mounted to the hub axle, a slave rotatably mounted to the hub axle, a power transmitting mechanism disposed between the driver and the slave for changing a rotational speed of the driver and for communicating rotational power from the driver to the slave, a clutch mechanism for selectively engaging and disengaging the slave and the driver, and a clutch switching mechanism for controlling the clutch. The clutch switching mechanism includes a weight member that moves radially outwardly in response to centrifugal force created by rotation of the weight member around the hub axle, a control member operatively coupled to the clutch mechanism and rotatable about the hub axle in response to movement of the weight member between an engaging position for causing the clutch mechanism to engage the driver and the slave and a disengaging position for causing the clutch mechanism to disengage the driver and the slave, a weight support coupled to the slave and rotatably mounted relative to the hub axle for carrying the weight member and the control member, and a cylindrical bolt disposed coaxially with the hub axle for coupling the weight support to the slave.
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