基于可拓的弧面凸轮减速机构设计及廓面通用建模

Design of globoidal cam’s deceleration mechanism based on extension and general modeling of its profile

弧面凸轮减速机构是一种性能优良的传动机构,基于可拓理论设计出不同滚子的线啮合型和点啮合型弧面凸轮减速机构;应用空间共轭曲面接触原理推导弧面凸轮通用工作廓面方程,分析圆柱滚子、圆锥滚子、鼓形滚子和球锥滚子工作曲面参数,采用二分法思想提出一种弧面凸轮工作廓面通用建模方法,实现不同滚子曲面的弧面凸轮工作廓面建模,在Creo环境下实现弧面凸轮减速机构参数化建模;并应用ADAMS分析了设计出的4种不同滚子啮合的弧面凸轮减速机构动态特性,研究表明所设计的球锥滚子直纹面弧面凸轮减速机构具有较好的动态特性,为以后工业应用提供了很好的理论依据。

The globoidal cam’s deceleration mechanism is a transmission mechanism with excellent performance. In this article, based on the extension theory, efforts are made to design the globoidal cam’s deceleration mechanism with different rollers. The general equation of the globoidal cam’s working profile is derived by means of the contact principle of space conjugate surface, and the analysis is conducted on the working surface parameters of cylindrical roller, tapered roller, drum roller and spherical tapered roller. With the help of dichotomy idea, the method of general modeling is proposed for the globoidal cam’s working profile, which realizes the modeling of the globoidal cam’s working profile with different roller surfaces and the parametric modeling of the globoidal cam’s deceleration mechanism in the Creo environment. ADAMS is used to explore the dynamic characteristics of four kinds of the globoidal cam’s deceleration mechanisms with different roller meshing. The research shows that the globoidal cam’s deceleration mechanism with spherical-tapered-roller-ruled surfaces has desirable dynamic characteristics, which provides theoretical basis for its industrial application in the future.