设计凸轮机构,偏心距 e 是一个非常重要的参数,合理地选择偏心距 e,不仅可以以较小凸轮尺寸,获得较大的从动件的行程,而且使凸轮机构压力角减小,达到省力的目的。本文从凸轮机构的内部几何关系,推导出一种较简单的几何作图法,来确定偏心距与基圆半径 r。相对应的合理值。 Design cam mechanism, eccentricity e is a very important parameter, a reasonable choice of eccentricity e, not only with a smaller cam size, to obtain a larger follower stroke, but also to reduce the pressure angle of the cam mechanism, to save effort the goal of. In this paper, a simple geometrical mapping method is deduced from the internal geometric relationship of cam mechanism to determine the eccentricity and the radius r of the base circle. The corresponding reasonable value.