金属加工（热加工）Issue(6)：133-137,5.
某增程式新能源汽车发电机花键轴失效分析
Failure analysis of generator spline shaft of a booster electric vehicle
喻峰 1李成华 1王小琴 1李政1
作者信息
- 1. 重庆赛力斯新能源汽车设计院有限公司 重庆 401121
- 折叠
摘要
Abstract
The spline shaft of the generator of a domestic extended-range new energy vehicle is made of SCM440H alloy steel and breaks when the vehicle runs for 55000km.To explore the failure cause,the macro morphology observation of the fracture surface of the failed part,the fracture surface analysis,the metallographic microstructure analysis,the chemical composition analysis and the hardness test are carried out successively by using a stereomicroscope,a scanning electron microscope(SEM),a metallographic microscope(OM),an optical emission spectrometer(OES)and a hardness tester.The results show that the main cause of the failure of the spline shaft of the generator is that the depth of the effective hardened layer at the involute is lower than the technical requirements,which reduces its ability to resist stress deformation.At the same time,there is stress concentration at the R corner of the keyway.Under the combined action,cracking occurs at the R corner of the keyway and a fatigue source is formed at the cracked part,ultimately leading to multi-source fatigue fracture.关键词
花键轴/有效硬化层/应力集中/多源疲劳/疲劳断裂Key words
spline shaft/effective hardening layer/stress concentration/multi-source fatigue/fatigue fracture引用本文复制引用
喻峰,李成华,王小琴,李政..某增程式新能源汽车发电机花键轴失效分析[J].金属加工（热加工）,2025,(6):133-137,5.
