牵引电机主动齿轮裂纹产生原因分析  

Causes Analysis of Cracks in the Driving Gear of Traction Motor

作　　者：王玉婷 吕晶 杨其全 徐超 WANG Yuting;LYU Jing;YANG Qiquan;XU Chao(Metals and Chemistry Research Institute,China Academy of Railway Sciences Corporation Limited,Beijing 100081,China)

机构地区：[1]中国铁道科学研究院集团有限公司金属及化学研究所,北京100081

出　　处：《高速铁路新材料》2024年第6期58-62,共5页Advanced Materials of High Speed Railway

摘　　要：对伤损牵引电机主动齿轮进行了宏观形貌观察、断口微观形貌观察、金相组织分析和理化性能测试,研究了齿轮裂纹产生的原因。结果表明:因齿轮端部与挡圈存在微动磨损,挡圈接触面处形成白亮淬火马氏体组织,在周期性交变载荷作用下,裂纹自螺纹孔附近挡圈接触面的白亮淬火马氏体处萌生,并逐渐向齿面及齿轮内孔疲劳扩展,齿面因啮合力的作用发生了剥离掉块。齿轮材质中Cr元素的质量分数过高,当齿轮端面发生微动磨损时更易形成硬而脆的淬火马氏体组织。Macroscopic morphology observation,fracture scanning electron microscopy observation,microstructure analysis,and material inspection analysis experiments on the damaged drivimg gear of traction motor were conducted to study the causes of gear cracks.The results show that due to the fretting wear phenomenon between the gear end and the retaining ring,a white quenched martensite structure is formed at the contact surface of the retaining ring.Under periodic alternating loads,cracks initiate from the white quenched martensite near the threaded hole of the retaining ring contact surface and gradually propagate towards the tooth surface and the inner hole of the gear.The tooth surface peels off blocks due to the meshing force.The mass fraction of Cr element in the gear material is much higher,when fretting wear occurs on the gear end face,it is easier to form a hard and brittle quenched martensite structure.

关 键 词：主动齿轮 马氏体 化学成分 微动磨损 

分 类 号：U269.6[机械工程—车辆工程]