离合器压盘温度场与应力场分析及改进研究

针对离合器接合过程中，压盘滑摩温度过高发生的烧蚀、热变形现象，利用abaqus仿真软件建立了三维有限元分析模型，结合压盘的实际工作状况采用直接耦合法进行热结构耦合仿真。得到了压盘的温度场与应力场，并研究了滑摩转速、压力和压盘厚度对压盘温度场及应力场的影响，同时针对翘曲变形，通过在滑摩面增加内锥度对压盘结构进行了优化。结果表明：高转速差会增大压盘滑摩温度与应力，压盘摩擦接触区域向内径移动，翘曲变形更加严重；压力的增大同样会增大滑摩温度与应力，但对摩擦接触的影响较小；压盘厚度增大能增加压盘的热容量，同时也会使温度与应力更加集中；增加压盘内锥度能显著改善压盘滑摩面的温度与应力分布，最高值分别下降了11.8%、5.4%，摩擦副有效接触面积增加，提高了离合器的工作性能与稳定性。

Research on temperature field and stress field and improvement of clutch pressure plate

In the clutch engagement process, ablation and thermal deformation will occur when the pressure plate friction temperature is too high. Three-dimensional finite element model was established by using abaqus simulation software, and coupled simulation of thermal structure was conducted by direct coupling method combined with the actual working condition of the plate. The temperature field and stress field of the plate are obtained, and the influence of the sliding speed, pressure and thickness of the plate on the temperature field and stress field is studied. At the same time, the structure of pressure plate is optimized for warping deformation, and the inner cone angle is added to the sliding surface. The results show that the high rotational speed difference will increase the friction temperature and stress of the pressure plate, the friction area of the pressure plate moves towards the inner diameter, and the warping deformation becomes more serious. The increase of pressure also increases the friction temperature and stress, but has little effect on the friction contact. The increase of the pressure plate thickness can increase the heat capacity of the pressure plate, and also make the temperature and stress more concentrated. Increasing the cone angle in the pressure plate can improve the temperature and stress distribution of the sliding surface of the pressure plate significantly, the maximum value drops by 11.8% and 5.4% respectively, the effective contact area increases, and the working performance and stability of the clutch are improved.