| 摘要 |
PURPOSE: Structure of a bicycle is provided to drive a bicycle with a small power by combining an intermediate bracket between a pedal shaft and a wheel shaft and gradually increasing the torque. CONSTITUTION: A first and a second intermediate sprockets(60,70) consisting of two large and small sprockets(61,62,71,72) constituted of different number of gears and combined on the same shafts are installed on a frame(80) between a wheel shaft and a pedal shaft. A pedal shaft sprocket(10) is connected with the first intermediate sprocket via a chain(31). The first intermediate sprocket is connected with the second intermediate sprocket via a chain(32). The second intermediate sprocket is connected with a wheel shaft sprocket(20) via a chain(33). The pedal effort rotates the pedal shaft sprocket, and the rotational force is transmitted to the first intermediate sprocket via the chain. The first intermediate sprocket transmits the rotational force to the second intermediate sprocket. The second intermediate sprocket transmits the rotational force to the wheel shaft sprocket. Therefore, the torque is increased remarkably.
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