减速箱蜗杆断齿故障机理仿真分析与试验研究

Simulation analysis and experimental research of worm broken tooth failure mechanism of gearbox

为改善某型蜗杆断齿失效引起阀门执行器减速箱寿命严重不足的设计缺陷,通过解析解方法和有限元仿真分析方法对该蜗杆齿面接触应力及齿根弯曲应力进行了分析,并与材料的疲劳极限进行比较,验证了该蜗杆发生断齿的位置。结果表明,2种判别方法的结果与实际失效形式一致。在此基础上,对失效蜗杆断齿部位的宏观断口形貌、微观断口形貌进行了分析研究。所用相关方法可以为改型产品的优化设计提供参考。

In order to improve the design defect that the service life of the valve actuator reducer is seriously insufficient caused by the broken tooth failure of a worm,the contact stress of the tooth surface and the bending stress of the root of the worm were analyzed by means of the analytical solution method and the finite element simulation analysis method.Comparison between the two calculated values and the material fatigue limit was carried out,which rechecks the position where the worm gear breaks.The results show that the two methods are consistent with the actual failure mode.On this basis,the macro and micro fracture morphology of the broken tooth of the failure worm were analyzed.The relevant methods proposed can provide a reference for optimal design.