| 摘要 |
A cycle with a mechanical advantage drive system comprises a frame with at least one wheel rotationally attached to the frame. A drive rim is attached to the wheel adjacent to the outer circumference of the wheel. A pulley is rotationally attached to the frame. A belt is trained around and engages both the pulley and the drive rim. As a rider pedals to turn a crank arm adapted to drive the pulley, the pulley drives the belt, which in turn drives the wheel. Because the belt is positioned at the outer circumference of the wheel, an instantaneous fixed point along the lower side of the belt is created by the friction between the wheel and the surface along which the cycle travels. By passing the belt around the pulley, a mechanical advantage is created that significantly reduces the amount of force required on the belt to propel the cycle.
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