| 摘要 |
<p>A transmission device for a bicycle, the transmission device comprising : a first transmission means for obtaining forward driving force by driving a first free wheel (10) in conformity to a movement of a first drive unit when a crank shaft (9) is forwardly rotated ; and, a second transmission means for obtaining forward driving force by converting a direction of the rotating force produced in a rotational direction of a second drive unit, the rotational direction being supplied to a second free wheel (22) under a reverse rotation of the crank shaft (9), whereby obtaining forward driving force regardless a rotational direction of the crank shaft (9) to improve an effect of exercise. <IMAGE></p> |
