A comparative study of fatigue behavior between S-shaped and involute POM gears

Author:

Wu Ruo1,Wei Peitang1,Lu Zehua1,Liu Huaiju1,Zorko Damijan2,Xie Huaijie3

Affiliation:

1. State Key Laboratory of Mechanical Transmissions, Chongqing University , Chongqing 400044, China

2. Faculty of Mechanical Engineering, University of Ljubljana , Aškerčeva 6, Ljubljana 1000, Slovenia

3. Joinature Polymer Co., Ltd , Jilin 130113, China

Abstract

Abstract Applications of polymer gears have been gradually expanding from motion transmission to power transmission fields. Design of new gear teeth profiles plays a crucial role in meeting the requirement of replacing metallic gears with polymer ones. This work develops a computational framework consisting of tooth profile generation and fatigue life prediction of S-shaped and involute POM gears. The contact and bending fatigue performances of S-shaped and involute POM gears under oil lubrication are comparatively studied. It is found that the S-shaped profile reduces the tooth root stress by 25% and significantly improves the bending fatigue life by 10 times compared with the involute profile, especially under medium or high loading levels. Furthermore, the S-shaped gear with a single circular-filleted root curve benefits a 20% reduction of tooth root stress and a 30% increase in bending fatigue life compared to a double circular-filleted root curve S-shaped gear.

Funder

National Natural Science Foundation of China

Graduate Scientific Research and Innovation Foundation of Chongqing, China

Publisher

Oxford University Press (OUP)

Subject

Computational Mathematics,Computer Graphics and Computer-Aided Design,Human-Computer Interaction,Engineering (miscellaneous),Modeling and Simulation,Computational Mechanics

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