Study on Measurement Method of Oil Film Thickness at EHL Contact Point in Traction Drives under High Speed by Using GMFT Method

Abstract

In recent years, high-speed motors combined with traction-type reduction reducers have been considered to reduce the size and weight of electric vehicle power systems and increase their efficiency. A traction drive is a device that applies a strong load to two rolling elements and transmits power through the resulting EHL contact point. However, there is a concern that the increase in peripheral speed causes an increase in the thickness of the oil film in the contact point, resulting in a decrease in the transmission of power. In this study, the GMFT method, which enables one-shot measurement, was combined with a high-speed color camera to successfully capture the outline of the contact point under higher speed conditions than in existing studies.