按许用压力角确定凸轮机构基本尺寸的方法已见于许多资料,但由干论证不充分,还存在一些不足之处。有的得不到符合要求的最小基圆;有的满足不了对许用压力角的要求。本文以速度瞬心为基础分别用计算和作图两种方法,解决了按许用压力角同时确定最小基圆和相应偏距等问题。 The method of determining the basic dimensions of a cam mechanism based on permissible pressure angles has been found in many sources, but it is still inadequate due to dry proof. There are still some shortcomings. Some can not get the minimum base circle that meets the requirements; some can not meet the requirements of the allowable pressure angle. Based on the instantaneous center of instantaneous velocity, this paper solves the problems of simultaneously determining the minimum base circle and the corresponding offset according to the allowable pressure angle by using two methods respectively.