牵引式无级变速器功率损耗研究

摘要

For studying the traction continuously variable transmission（ CVT）, analytical formulas for spin speed, traction force of oil film and spin moment are derived. By means of a real example, the relationships of sliding power loss and spin power loss with the contact pressure, traction force of oil film, input rotation speed and geometry curvature ratio are analyzed. It has been shown that the gross power loss for a certain contact pressure and a certain geometry curvature ratio reaches to a minimal value separately. When the oil film traction force becomes greater, both the relative sliding speed and the sliding power loss become also greater, but the spin power loss keeps constant. When the the input rotation speed gets higher, both the sliding power loss and the spin power loss become greater gradually.%以牵引式无级变速器为研究对象，推导出了自转角速度、由油膜滑动产生的牵引力和由自转产生的力矩等解析式。通过实例，计算和分析了由滑动和自转产生的功率损耗与接触压力、油膜牵引力、输入转速和几何曲率比等因素间的变化规律。存在一个接触压力和一个曲率比会使得总功率损耗分别取得极小值。油膜牵引力的增大，必然产生较大的相对滑动速度，增大了功率损耗，但由自转产生的功率损耗不会发生变化。随着输入转速的增大，由相对滑动和自转所产生的功率损耗均会逐渐增大。