变速箱输出轴失效分析  

Failure Analysis of the Gearbox Output Shaft

作　　者：罗学泉[1] 曾雪云[1] 唐新民[1] 

机构地区：[1]江铃汽车股份有限公司,江西南昌330001

出　　处：《热处理技术与装备》2012年第2期58-60,64,共4页Heat Treatment Technology and Equipment

摘　　要：通过宏观断口、化学成分、硬度和金相检测、输出轴校正、过渡角及表面粗糙度测试等,对变速箱输出轴断裂原因进行了研究。结果表明,输出轴断裂的主要原因是花键处过渡角较小,表面粗糙度较大,造成输出轴花键过渡角处在运行中产生了较大的应力集中,并且人工校正时下压力难以控制,容易在零件表面产生微裂纹。Through the detection of macroscopic fracture surface,chemical composition,hardness and metallographic analysis,calibration of output shaft,the measurement of transitional angle and surface roughness,the failure analysis of gearbox output shaft is researched.The results show that the main reasons of failure is the stress concentration at the transitional angle of output shaft spline,causing by the smaller transitional angle and the larger surface roughness.The microcrack is easily produced by down force that is difficultly controlled during manual correction.

关 键 词：失效分析 疲劳断裂 应力集中 

分 类 号：TG115[金属学及工艺—物理冶金]