湿式多片换挡离合器温度场综合优化方法

In order to solve the thermal failures such as thermal buckling caused by excessive radial temperature difference of friction elements in the wet multi-disc shifting clutch,the numerical simulation and experimental research are made on the homogenization of radial contact pressure and the gradient design of friction coefficient of friction elements. Firstly,based on the compact structure of clutch,a back plate is designed and topologically optimized. The stiffness of the optimized back plate is improved and the deformation trend of friction elements is reduced,thereby reducing the maximum pressure difference and temperature difference of friction elements by 28. 64% and 28. 48%, respectively. Then the texture treatment and test are carried out on the surface of friction plate. It is found that the friction coefficient decreases with the increase in the texture line density. A gradient design method for the texture density decreasing along the radial direction of friction plate is proposed, reducing the maximum temperature difference by 17. 69%. Finally,the optimized back plate and textured friction plate are comprehensively applied to homogenize the radial contact pressure and decrease the radial friction coefficient. Compared with the original design,the maximum temperature difference and thermal bending moment are reduced by 41. 73% and 45. 33%,respectively. This study provides a theoretical basis for the design of higher power density clutches.