关键词: 摆线减速器, 接触力学, 传动效率, 动力学

Abstract: In order to study the correlationship between contact load and efficiency of cycloidal pin gear transmission, a theoretical analysis method was proposed based on Newton's method and elastic contact theory to determine accurate locations of multi-tooth mesh points, contact load distribution and transmission efficiency. Rigid body dynamic equations of cycloidal gear were built by the method herein to derive transmission efficiency, which could be expressed as a function of resultant external force of cycloidal gear. The contact loads of cycloidal gear were determined by relative geometric relationships and contact conditions of tooth profile discrete points, gear pin circle and output pin/hole of cycloidal gear. The contact loads of cycloidal gear were transferred into generalized forces to get the transmission efficiency function expressed by resultant external force/torque of cycloidal gear. A single-stage cycloidal reducer was taken as an example to analyze effects of design parameters and operating conditions on transmission efficiency. Comparative tests were tried on a special test bench. Results indicate that the theoretical calculated transmission efficiency does not change with the load. Under low load, the transmission efficiency is low, and rises rapidly when load increasing. Under high load, the transmission efficiency does not change much with load and tends to be a constant value, which is close to the theoretical one. The proposed method is accurate only for high load and may be a simple method to evaluate transmission efficiency of cycloidal pin gear.

Key words: cycloidal reducer, contact mechanics, transmission efficiency, dynamics