| 摘要 |
A crank assembly for use on a human powered machine, the crank assembly having one or more cranks that can be connected to opposing ends of an axle of the machine. The crank assembly further has a chain ring having teeth for engagement with a drive element, the chain ring being capable of being supported on the axle such that the chain ring can rotate relative to the axle; and a set of two or more leaf springs, each spring has a root that can be rotationally fixed relative to the axle and a tip that bears against the chain ring to impart force to the chain ring. Each spring tapers from the root to the tip in a plane of the chain ring.
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