| 摘要 |
A gear transmission mechanism for driving a bicycle to run, comprising a base supporting frame (1) attached to the down tube (8), the seat tube (9) and the seat stay (17); a first axle (2) inserted through the rear wheel hub of a bicycle into one hole (12) on said base supporting frame with the two opposite ends thereof respectively coupled with two cranks; a first gear (32) mounted on said first axle and carried by it to rotate; a second axle (5) fastened in another hole on said base supporting frame to carry a second gear (57), which is engaged with said first gear (32) and a third gear (56) which is engaged with a one-way gear on said rear wheel hub (4) to rotate. Rotating the cranks causes the wheel hub to carry the bicycle wheels to rotate. <IMAGE> |
