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research-article

Parametric studies of mechanical power loss for helical gear pair using a Thermal EHL model

[+] Author and Article Information
Mingyong Liu

Hubei Agricultural Machinery Engineering Research and Design Institute, Hubei University of Technology, Wuhan, 430068, China
lmy8508@hbut.edu.cn

Peidong Xu

Hubei Agricultural Machinery Engineering Research and Design Institute, Hubei University of Technology, Wuhan, 430068, China
463176132@qq.com

Chunai Yan

Dongfeng Passenger Vehicle Company, Wuhan, 430058, China
664874648@qq.com

1Corresponding author.

ASME doi:10.1115/1.4040723 History: Received January 17, 2018; Revised June 21, 2018

Abstract

In this study, a comprehensive mechanical efficiency model based on the thermal elastohydrodynamic lubrication (TEHL) is developed for a helical gear pair. The tribological performance of the helical gear pair is evaluated in terms of the average film thickness, friction coefficient, mechanical power loss, mechanical efficiency, etc. The influence of basic design parameters, working conditions, thermal effect and surface roughness are studied under various transmission ratios. Results show that the contribution of thermal effect on the tribological performance is remarkable. Meanwhile, the rolling power loss constitutes an important portion of the total mechanical power loss, especially around the meshing position where the pitch point is located in the middle of contact line and the full EHL state with the friction coefficient less than 0.005. The proper increase of normal pressure angle and number of tooth can improve the tribological performance. The influence of helix angle on the mechanical efficiency is less significant. A positive addendum modification coefficient for pinion and a negative addendum modification coefficient for wheel are good for improving the mechanical efficiency. The results provide the tribological guidance for design of a helical gear pair in engineering.

Copyright (c) 2018 by ASME
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