汽车后桥从动齿轮断齿和齿面损伤失效分析
Fatigue Analysis of Tooth Surface Damage and Fracture for Rear Axle Passive Gear of Truck
张红霞, 杨 明, 位立刚
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作者单位：湖北汽车工业学院 材料工程系, 湖北 十堰 442002)
中文关键字：后桥从动齿轮； 失效； 渗碳； 疲劳断裂
英文关键字：rear axle passive gear; failure; carbonization; fatigue fracture
中文摘要：采用宏观微观形貌观察、化学成分分析、金相检验、硬度测试和有效硬化层深测量等方法对失效的齿轮进行了分析。结果表明：齿轮失效原因在于齿轮齿根部有较深的切削沟槽，导致齿根部应力加大，形成裂纹源,并产生高周疲劳引起齿根部断裂，进而波及其他齿产生断裂和剥落；用户在使用时也存在齿轮润滑油选用不当等问题。
英文摘要：In order to find out the reason for the rear axle passive gear being failure, the macro characteristics, micro-morphology, microstructure of the damaged teeth were observed and analyzed. The composition, hardness and carburized layer depth were measured. The results show that the failure reason of passive gear is because the gear bottom has cutting groove in cool work, which leads to the high stress and high cycle fatigue crack, causing the start tooth broken, and thus getting other teeth broken. The less important problem is that the lubricating oil of gear is unwise.