针对摆线针轮行星传动啮合过程中啮合齿面摩擦行为影响系统动态特性、传动效率及接触疲劳特性等问题，基于牛顿流体及指数率、Ree-Eyring模型建立摆线针轮线接触时变热弹流润滑数值分析模型，获得理想安装的摆线针轮副完整啮合周期内摩擦力、摩擦系数及摩擦损失功率变动。结果表明，基于牛顿流体及指数率流体模型所得摩擦系数与工程实际不符；基于Ree-Eyring模型纯滚动啮合产生的热效应在重载下对啮合过程中膜厚、摩擦损失功率影响较大，对压力、摩擦系数影响较小。研究非牛顿流体特征参数与摆线针轮传动设计参数对啮合中摩擦系数、摩擦损失功率影响规律表明，流体特征应力增加摩擦系数及损失功率均减小；短幅系数取较大值时大部分啮合区间摩擦系数增加、摩擦损失功率减小。
Abstract
A cycloid drive belongs to precision drive and its meshing friction influences the dynamic characteristics of the system, the transmission efficiency and the contact fatigue. A time-varying thermal elastohydrodynamic lubrication line contact model is developed for the cycloid drives with newtonian fluid , Ree-Eyring fluid or Ostwald-de Waele fluid in order to investigate rolling contact friction, friction coefficient and frictional power loss in the meshing period. Studies show that shear stress and rolling power loss calculated with Ostwald-de Waele fluid and Newton fluid don't accord with the engineering practice. Thermal effect produced by pure rolling with Ree-Eyring fluid affect the film thickness and the frictional power loss and its influence on the pressure and friction coefficient is small. At the end of the paper, the effect of Ree-Eyring stress and design parameters on friction coefficient and rolling power loss are discussed. As can be seen, as the Eyring stress increases, the friction coefficient and rolling power loss decrease; As the short width coefficient goes up, the friction coefficient at most engaging moments increases and rolling power loss decreases.
关键词
摆线轮 /
热弹流润滑 /
Eyring 流体 /
摩擦损失功率 /
摩擦系数
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Key words
cycloid drive /
TEHL /
Eyring fluids /
frictional power loss /
friction coefficient
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