| 摘要 |
The invention alters the work ratio by alternating the leverage of the crank to counter the constantly changing leverage of the common chain wheel to maximize the cyclist's output. The cyclist's downward weight pressing down on the pedal propels a bicycle. We will call this the propulsion leverage. When pedals are in top and bottom position, the propulsion leverage is low. This invention reduces the disadvantage by reducing the chain wheel radius at this position. When pedals move forward, the propulsion leverage increases. The invention optimizes this increase in leverage by increasing the distance of the radius of the chain wheel. The shortest to longest radius in the invention has the golden ratio of 1.618 which fits the natural dimensions of the human body. |
