小齿轮齿线修形对弧线齿面齿轮齿面影响分析

结合渐开线齿廓弧齿圆柱齿轮齿面生成原理,增大弧线齿圆柱齿轮凹齿面的圆弧半径,推导圆柱齿轮齿面方程,得到截面单齿厚度延轴线不同的弧线齿圆柱齿轮。以弧线齿圆柱齿轮为假想刀具,推导出弧线齿面齿轮齿面方程,将有无齿线修形的面齿轮做对比,并进行了内径分析。结果表明,在保持原有面齿轮设计参数不变的情况下,修形后的面齿轮与原面齿轮内径处的齿厚相差0.113 mm,且面齿轮单齿齿厚沿着齿宽由内向外逐渐增大;同时,修形后的弧线齿面齿轮外径端面并不是尖状,而呈现平面状,从而避免了修形后的面齿轮出现外径齿顶变尖现象。因此,对小轮齿线修形可增加面齿轮单齿厚度,提高面齿轮传动强度;也为后续齿线修形生成的弧线齿面齿轮抗偏载及啮合特性等方面提供了理论基础。

Lubrication characteristics of cycloid pin wheel transmission of RV reducer

In order to analyze the lubricating characteristics at different meshing points in the cycloid pin wheel transmission process,the cycloid gear teeth were discretized,combined with the kinematic analysis of the cycloid pin gear transmission and the contact analysis of the gear teeth.The progressive mesh densification method(PMD)was used to numerically solve the film thickness.The influence of the design parameters and process parameters on the lubrication characteristics was analyzed.The elastohydrodynamic lubrication and mixed lubrication characteristics at different contact points were obtained.The optimal meshing area of the cycloid gear tooth was determined,and the film thickness ratio,contact load ratio,maximum contact pressure at different points,average film thickness and roughness after contact deformation were analyzed.The conclusion of this study provides effective guidance for the research on the modification of cycloid gear teeth.