湿式多片离合器结构特征对接触压力特性的影响

Effects of Structural Characteristics of a Wet Multi-Disk Clutch on Contact Pressure

针对湿式多片离合器的实际结构特征,建立多摩擦副系统有限元模型和热力学数值模型,研究压板厚度、卡簧宽度、摩擦副数等结构参数对摩擦副间接触压力差异性的影响,并通过离合器静压实验验证数值模型的正确性。制定摩擦副间接触压力差异性评价指标,提出离合器最优结构特征。研究结果表明:离合器的压板厚度和卡簧宽度对离合器接触压力差异性的影响最大,摩擦副数对其影响较小;增大压板厚度和卡簧宽度可以显著降低接触压力分布的差异性和摩擦副的径向温差;相比于初始工况,最优工况下摩擦副的最大压差和温差分别降低82%、61%。

Based on the structural characteristics of a wet multi-disk clutch, a finite element model and a thermodynamic model of a multi friction-pair system are developed. The influence of structural parameters on the contact pressure between friction pairs are studied, including backplate thickness, circlip width, and number of friction pairs. Moreover, the correctness of the numerical model is verified by clutch static pressure experiments. An index is employed to evaluate the pressure differences between friction pairs, and the optimal structural parameters of the clutch are proposed. The results show that the backplate thickness and circlip width have strong effects on the pressure difference, while the number of friction pairs only has a slight influence. The differences between the contact pressure and radial temperature of friction pairs can be significantly smoothed out by increasing the plate thickness and circlip width. As compared with the initial structural conditions, the maximum differences of the control pressure and radial temperature at the optimum condition are reduced by 82% and 61%, respectively.