A cone-shaped pulley with a spiral groove, used in a cord- or chain-winding clock to maintain even travel in the timekeeping mechanism as the force of the mainspring lessens in unwinding.

• 均力圆锥轮一种用在绳索式或链条式钟表里的带螺旋状槽的圆锥轮，当钟表走动而发条动力减少时，用来维持计时装置的平稳运行