| 摘要 |
PURPOSE: A drive structure of a bicycle is provided to increase driving efficiency of bicycle by the proper arrangement of a small gear and a big gear. CONSTITUTION: A drive structure of a bicycle comprises a pedal(1) and a pedal gear(2). The pedal gear rotates to rotate a second gear(3). A second opinion gear is meshed with a third gear(4-1). The third gear is meshed with a fifth gear to drive a bicycle. The pedal gear and the second gear are connected with a chain. |
