| 摘要 |
A bicycle speed shifting structure includes a link device, a driving device, a spring, a pedal shaft and a combining device installed inside a 5-way pipe of a bike body, and a sprocket installed outside the 5-way pipe for linking the sheathing device, and a disc, a sun gear, planetary gears, ring gears, outer gears, and a turning disc installed in an external casing and a chassis. If a pedal of the assembled structure is peddled, a pedal shaft will drive the turning disc to drive the ring gear and the outer gear to move in the same direction through rollers disposed on the periphery of the turning disc, so as to accelerate the bicycle and eliminate intermittent idle pedaling while shifting speed in a conventional structure, and the invention can be used for the speed shifting of various different models of bicycles.
|
