| 摘要 |
PURPOSE: A bicycle is provided to add a driving device to an existing driving device, thereby being traveled with the other driving device even when there is failure in one driving device. CONSTITUTION: A bicycle comprises a frame(25), a rotary shaft(41), a pair of pedals, a rear wheel shaft(23), and a pair of driving devices(50b). The frame isolates a front wheel(11) and a rear wheel(21). The rotary shaft is rotatably connected to the frame. The pair of pedals rotates the rotary shaft. The rear wheel shaft is rotatably installed in the frame. One of the driving devices comprises a driving sprocket(53b), a driven sprocket(55b), and a chain(57b). The driving sprocket is installed on the rotary shaft. The driven sprocket is arranged in the rear wheel shaft. The chain interconnects the driving sprocket and the driven sprocket. |
