卡簧约束对多片离合器温度场的影响分析

Effect of Circlip Constraint on Temperature Field of Multi-disc Clutch

为分析卡簧约束对多片离合器接触应力分布的影响,运用Abaqus仿真软件建立了多片离合器三维有限元模型。通过数值模拟,得到了多片离合器摩擦表面的接触应力分布规律和多片离合器的温度场分布。仿真和试验结果表明:卡簧约束导致了摩擦副接触应力沿径向分布不均匀,越靠近卡簧,摩擦元件的外径接触应力越大,径向应力差异越大;越远离卡簧,径向应力分布差异趋于平缓,并逐渐接近活塞压力;卡簧轴向约束导致了摩擦元件的径向温差加大,外径温升快,内径温升慢,并且轴向不同位置摩擦元件的温度场分布不一致,近卡簧侧的摩擦元件更易发生热翘曲;离合器低速长时滑摩试验验证了该温度场模型的正确性,所建模型能够切实有效地反映离合器的实际温升特性。

In order to investigate the influence of circlip constraint on the contact stress distributions of multi-disc clutch,a 3 D finite element model is developed by Abaqus software. The contact stress distribution is obtained by the 3 D finite element model,and the temperature distribution is obtained through numerical simulation. The simulated and experimental results show that the concentrated load of circlip results in the uneven distribution of radial contact stress of friction pairs during the clutch engagement process. The closer the friction surface is to the circlip,the larger the contact stress of outer radius of friction surface is,and the more obvious the difference of the radial contact stress is; when the friction pair is away from the circlip,the contact stress gets closer and closer to the piston pressure,and the difference of radial contact stress tends to be ease. The concentrated load of circlip leads to the increase in the radial temperature difference. The temperature in outer radius rises significantly,while the temperature in inner radius increases slowly. Moreover,the temperature fields of friction components in different axial directions are inconsistent,and the friction component near the circlip is more prone to be buckled.The proposed temperature field model is verified effectively by long time,low speed sliding experiments,which can better reflect the actual temperature rise characteristics of the multi-disc clutch.