关键词: 轮边减速器；太阳轮；失效分析

Abstract: In order to solve the failure problem of the sun gear of wheel-side reducer in the drive axle assembly gear fatigue bench test, the comprehensive analysis of macro profile, chemical composition, metallographic structure, hardness and hardened depth of the failure sun gear is carried out. This paper supposes the failure cause of the sun gear is the unbalance load. The finite element analysis of the drive axle assembly based on MASTA shows that the safety factor of gear contact fatigue is less than 1 and the contact between the sun gear and the planet gear is unbalanced. Therefore, it is inferred the failure cause of the sun gear is the unbalance load of gear causes excessive local stress on tooth surface. In order to improve the failure cause of the sun gear, the tooth width of the sun gear is increased by 10 mm and the gear shape is modified. The failure problem is solved. This study provides a basis for the failure analysis and improvement of sun gear.

Key words: wheel-side reducer; sun gear; failure analysis