| 摘要 |
A variable speed transmission system usable with the standard rear axle of most bicycles which utilizes a rotating chain sprocket engaging an endless chain for receiving an input torque and transmitting an output torque. A shifter device includes a stationary shifter ring, a moveable shifter plate, and an appropriate control mechanism for selectively displacing the shifter plate with respect to the shifter ring and sprocket. An appropriate apparatus means is utilized to selectively displace the longitudinal axis of the rear axle with respect to the axis of the shifter ring and axis of the sprocket to vary the torque transmission ratio. The drive apparatus can include a plurality of drive arms secured to and moveable with a clutch associated with the rear axle which are operably secured to the sprocket or a groove plate adjacent the sprocket and secured to the rear axle having a plurality of grooves operable with a drive ring affixed to the sprocket, and having slider means connecting the drive ring and groove plate.
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