冷却塔风机减速机伞齿轮断裂失效分析

The Failure Analysis of Speed Reducer Bevel Gear of Cooling Tower Fan

循环水场冷却塔风机减速机伞齿轮使用后出现打齿、断齿现象,通过断口分析、金相检验、能谱分析、材质分析以及力学性能检验,对其打齿、断齿原因进行了分析。发现伞齿轮打齿、断齿的原因是齿轮表层含碳量低,降低了齿轮表面接触疲劳强度,发生疲劳断裂,并据此提出了改进措施。

The speed reducer bevel gear of cooling tower fan appeared cracking after running. The crack reason was detected by fracture analysis, metallographic examination, energy spectrum analysis, qualitative analysis and mechanical property test. The results showed that the crack resulted from low carbon content of the gear surface, which reduced the gear surface contacted fatigue strength. The improvement was put forward.