A novel tooth tip relief method for reducing micro-pitting of spur gears

• Published in: Advances in mechanical engineering 2021-09, Vol.13 (9)
• Main Authors: Xu, Xiangyang, Liang, Yinghua, Zuo, Shumiao, Tenberge, Peter, Dong, Peng, Liu, Yanfang, Wang, Shuhan, Wang, Zhuo
• Format: Article
• Language: English
• Subjects: Contact stresses; Failure modes; Fatigue failure; Gear teeth; Pitting (wear); Spur gears; Tip relief
• ISSN: 1687-8132; 1687-8140
• DOI: 10.1177/16878140211044641

Micro-pitting is a common fatigue failure mode of spur gears. To reduce it, this paper proposes a novel tooth tip relief method. Gear meshing simulation is firstly performed considering the actual contact path, showing that there are four Hertz contact stress peaks in the transition areas of the tooth flank. Equations are then developed for the novel tooth tip relief method: one focuses on the smooth transition between the involute profile and the tip relief region, the other on the smooth transition between the tip relief region and the tooth tip. The results of curvature radius and Hertz contact stress show that the proposed novel method can effectively reduce the Hertz contact stress peaks, which indicates this tip relief method could benefit for reducing the micro-pitting. Finally, both wear simulations and bench tests are conducted, verifying the effectiveness of the proposed method for reducing the micro-pitting of spur gears.