等宽确动凸轮机构的设计 Synthesis of Constant-Breadth Cam Mechanisms

Abstract

本文提供一种解析法用以设计等宽确动凸轮的轮廓。等宽确动凸轮机构的凸轮和从动件在任一时刻均有两个接触点，并且这两个接触点的连线必会垂直于从动件的接触平面。因为从动件的接触面间的距离固定，从动件前半周期和后半周期的运动规律有相依的函数关系，因此在前半周期所选定的从动件之运动规律亦同时决定了从动件在后半周期的运动规律。等宽确动凸轮的轮廓可以用解析方程式表示。本文提供一实例加以说明。 This paper presents an analytical approach for determining the profile of the constant-breadth cam. At any instant there are two contact points between the cam and the follower, and the line passing through the two contact points must be perpendicular to both faces of the follower. The follower motion program can be designed for 180˚ of cam rotation, but in order to satisfy the constant-breadth condition, the follower motion program of the remaining 180˚ depends entirely upon that of the previous 180˚. The cam profile can be expressed analytically. An example is provided to illustrate the approach.