考虑接触面局部散热的湿式离合器摩擦片滑摩温升特性

湿式离合器摩擦元件摩擦温升状态与车辆性能息息相关.首先考虑沟槽冷却、接触面局部散热和摩擦因数实时变化，引入了副间等效对流换热系数和等效增益系数，优化了温度场数值模型.通过有限差分法进行求解，并试验验证了有效性，比原模型具有更高的准确性.在滑摩稳定期，应用滑摩温度场优化模型分析了转速、油压对温度场的影响规律.用试验方法研究了润滑流量对滑摩温升特性的影响规律，并测得了变形失效过程的温升特性变化. 

Temperature Rise Characteristic of Friction Disc in Wet Clutch Considering the Local Heat Dissipation on the Contact Surface

The friction temperature rise state of friction components in wet clutch is closely related to vehicle performance. In this paper, a numerical model of temperature field was optimized, considering the groove cooling, local heat dissipation and time-varying friction coefficient on the contact surface, and introducing a heat exchange coefficient of equivalent convection between discs and an equivalent gain coefficient. The optimization model was solved and verified based on a finite difference method and experiment. Results show its better accurate and validity than the traditional model. During the stable period, the influence of rotational speed and oil pressure on the temperature field was also analyzed with an optimization model of the sliding temperature field. The influence of lubrication flow on the temperature rise characteristic of sliding friction was experimentally analyzed, and the temperature rise characteristics in deformation failure process were measured. The research results can provide a guiding for the fine simulation and control of the friction components in wet clutch.