Investigation of thermal behavior of a novel multi-conical friction pair during wet clutch's engagement based on finite difference method

A two-dimensional temperature prediction model of the multi-conical friction pair during a single engagement period is established. Energy governing equations and non-static thermal contact conductance are coupled, and the transient surface temperatures are obtained by using the finite difference method. The transient temperature field and the effects of contact pressure and relative speed are studied. The positive interaction effect of these two factors on the temperature rise is observed. The maximum temperatures of the friction plate and clutch disc appear in different positions, where the former is closer to the outermost contact surface. With the combination of high thermal conductivity, the friction plate exhibits a more significant radial temperature gradient. And the accompanying thermal stress may induce deformation and ablation. In addition, the temperature decreases axially from the top of the cone. This work provides a prerequisite for studying the friction, wear and torque transmission performance of clutch, offering a reference for the further control and optimization design of novel clutch systems.