| 摘要 |
A drive assembly for a physically propelled vehicle such as a bicycle having a crank arm operatively connected to the drive member for rotating the drive member, and a power arm rotatively mounted on a power axis for relative angular movement between the power arm and crank arm. The drive axis, defined by the drive member, is relatively offset from the power axis. A control mechanism interconnects the power arm and crank arm for rotating the crank arm and drive member, and for accelerating the power arm ahead of the crank arm during one portion of the crank arm cycle and decelerating the power arm behind the crank arm during another portion of the crank arm cycle. A power-adjusting mechanism is connected to the power arm for moving the power axis relative to the drive axis for changing the point in the cycle of the crank arm when the acceleration and deceleration of the power arm occurs.
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