| 摘要 |
<p>A power transmission device of a bicycle is provided to move a bicycle with little strength by connecting a lever, which makes a vertical movement on a power point bearing, to a crank to make a vertical movement with a pedal and operating a driving unit. A power transmission device of a bicycle comprises a frame unit formed at the front to support a bicycle and connected with many pipes(14) to form a front wheel(12) provided with a handle to adjust the direction at the front and a saddle(13) at the center, a pedal unit formed at the center to generate the thrust of a bicycle by a user and provided with a power point bearing(21) fixed to the center of the frame unit, a lever connected to the power point bearing to be rotatable, a support(22) with a pedal formed on the front of the power point bearing to be longer than a conveyor and a transfer stand(23) formed on the backside of the power point bearing, a crack unit receiving the vertical driving force of the pedal unit and converting into a rotation movement, and having a connecting rod(31) whose top is connected with the end of the transfer stand and bottom is connected to a crank pin of a crank fixed to the backside of the pipe of the frame unit to be rotatable by a bicycle body fixing bearing, and a driving unit transferring the rotational movement of the crank unit and rotating a pair of rear wheels(41) fixed to the backside of the frame unit by a bearing.</p> |
