Investigation on the failure mechanism and safety mechanical-thermal boundary of a multi-disc clutch
Investigation on the failure mechanism and safety mechanical-thermal boundary of a multi-disc clutch
复制标题
多片离合器失效机理及安全机热边界研究
DOI：
10.1016/j.engfailanal.2019.04.071
复制
发表时间：
2019-09-01
影响因子：
4
通讯作者：
Li, Mingyang
中科院分区：
文献类型：
--
作者：
Yu, Liang;Ma, Biao;Li, Mingyang
提出了一种多片离合器故障的综合诊断方法。建立了机械屈曲模型，研究了阻力矩与周期性周向亮点之间的关系。考虑弹性挡圈的集中反载荷，得到了摩擦表面的接触压力和温度。采用销-盘摩擦磨损试验研究了摩擦片在不同温度条件下的摩擦磨损特性，并利用金相显微镜观察了摩擦片的表面形貌。结果表明，热屈曲和机械屈曲都可以导致机械-热屈曲。当温度在15 ℃~400 ℃范围内变化时，轮盘依次经历磨粒磨损、犁削磨损、粘着磨损和分层磨损。最后，提出了机械-热安全边界。提出了优化设计弹性挡圈以避免应力集中;增加分离片齿数以提高扭矩传递能力;根据分离片在离合器组件中的轴向位置确定分离片的厚度。
The comprehensive fault diagnosis method has been developed to analyze the failure of the multi-disc clutch. The mechanical buckling model is developed to investigate the relationship between the resistance torque and the periodic circumferential bright spots. The contact pressure and temperature on the friction surfaces are obtained with the consideration of the concentrated reactive load of the circlip. The friction and wear characteristics of the friction disc under different temperature conditions are explored by the pin-on-disc test, and then the surface morphologies of tested discs are observed by the metalloscope. The results demonstrate that both the thermal buckling and the mechanical buckling can result in the mechanical-thermal buckling. As the temperature varies from 15 degrees C to 400 degrees C, the disc experiences the abrasive wear, ploughing wear, adhesive wear and delamination wear in order. Finally, the mechanical-thermal safety boundaries are proposed. Moreover, the paper provides some suggestions for better design of clutch: the circlip should be optimized to avoid stress concentration; the teeth number of separate plates should be increased to improve the torque transmission capacity; the thickness of separate plates should be different which can be determined by their axial positions in the clutch pack.