Study On The Characteristic Of Wet Multi-disk Clutch Engagement Process

Wet multi-disc clutch is widely applied in the vehicle driving system, in order to deeply understand the engagement performance of wet clutch in engaging process, this dissertation makes deep and systematic research on engagement and thermal load characteristics combined with related experimental study. Mainly contents of the thesis are as follows:(1) The dynamic model of multi-plate wet clutch engagement was established and its torque characteristics during engagement was analyzed based on this model; the variation of friction coefficient was discussed through the theoretical and experimental study, and function of friction coefficient was got by numerical fitting. Sliding friction work and Sliding friction power was calculated, whose results was compared with the data of experiment.(2) The computing method of distribution coefficient of heat flux and the convective heat transfer coefficient was improved, and then based on a heat transfer model with boundary condition, transient temperature field and influence factors were discussed. A simplified micro model of friction disc was built, the influence of parameters of friction material and micro structure on the temperature field were discussed through numerical analysis.(3) The initial pressure distribution and its influence factors were analyzed based on a2-D finite element model of the clutch, a thermal-stress coupling model was established and the results of the analysis were discussed in order to consider the influence of thermal stress on the clutch, and some suggestion for design and usage was put forward.(4) The experiment was performed with1:1experimental platform, the main emphasis was focused on measuring methods of friction coefficient, and transient temperature of friction pairs. Finally, The results show that the obtained simulation and experimental temperature are similar in trend, maximum temperature value error is less than8%.