| 摘要 |
A drive system for bicycles is disclosed. In the drive system, a crank plate or a cam plate is rotated around two bearings of linearly integrated slide pipes in accordance with a rotating action of a pedal around the drive shaft, thus allowing the integrated slide pipes to slidably move over a crank shaft in opposite directions and to repeatedly and alternately accomplish a fully extended position and a fully retracted position. When the pedal is rotated downwardly at the front section of the drive sprocket during a rotating action of two pedals, the integrated slide pipes fully extend from the crank shaft, thus accomplishing the fully extended position. On the other hand, when the pedal is rotated upwardly at the rear section of the drive sprocket, the integrated slide pipes fully retract over the crank shaft, thus accomplishing the fully retracted position. When a user continuously rotates two pedals while riding a bicycle, each drive system, mounted to each end of the drive shaft, repeatedly and alternately accomplishes the fully extended position and the fully retracted position, thus generating a maximum driving force using a minimum pedaling force. |
