凸轮机构从平面到空间，形成完整的理论，已有很多学者做了卓有成效的研究。将前者看做是后者的特例，给出统一的说明，但是往往倾向于采用较深的数学语言，不大利于初学者理解。本文从基本概念出发，揭示问题的本质，使基本原理简明易懂。为了兼有平面凸轮的纯滚动与弧面凸轮的优越动态特性，近年来球面凸轮重新引起注意。本文也将这种凸轮的基本方程的推导纳入从平面到空间凸轮的一般原理中 Cam mechanism from plane to space, forming a complete theory, many scholars have done fruitful research. Think of the former as a special case of the latter, giving a unified explanation, but tend to adopt a deeper mathematical language, not conducive to beginners to understand. Starting from the basic concept, this article reveals the essence of the problem and makes the basic principle easy to understand. In order to combine the excellent dynamic characteristics of plain cams with curved cams and flat cams, spherical cams have drawn renewed attention in recent years. This article also incorporates the derivation of the basic equations for such cams into the general principle of plane-to-space cams