盘式制动器摩擦温度场的数值模拟

Simulation of the Friction Temperature Field for Disc Brake

采用COMSOL Multiphysics模拟盘式制动器制动过程的三维瞬态温度场,研究了制动盘和摩擦片的温度分布情况以及它们的热物性参数对摩擦副温度场的影响。结果表明:盘式制动器在制动过程中的高温时刻,高温处在沿盘转动方向与摩擦片滑出的区域;制动盘表面温度从高温度区域沿制动盘转动方向递减,摩擦片表面温度沿盘转动反方向递减;制动盘和摩擦片的径向温度最大值出现在摩擦区域的中部位置,而外径和内径处温度较低,轴向方向都由摩擦面表层向内层方向递减;增大制动盘或摩擦片的某一热物性参数均可降低摩擦副表面最大温度值,但制动盘相对摩擦片,其导热系数、比热容和密度对摩擦副温度值的影响要大得多,研究内容可为制动器的结构设计及材料的选择提供参考。

The threedimensional transient temperature field for disc brake were simulated using software COM SOL Multiphysics, the situation of temperature distribution for friction pairs device in the braking process and the effect of material thermal parameters on its temperature field were investigated. The results showed that at the high temperature moment of the braking process of the disc brake, the high temperature place was located on the area of sliding out with the friction plate along the disk rotates direction;the surface temperature of brake disc decreased from the high temperature zone along the direction of the brake disc rotation ; the surface temperature of friction plate decreased along the opposite direction of the brake disc rotation;the maximum radial temperature of the brake disc and friction plate in the braking process was located on the central part of the friction zone, the temperature of the outside radius and inside radius was lower, the temperature of the axial direction decreased from the friction surface layer to the inner layer direction ; it can reduce the maximum temperature value of friction deputy surface by increas ing any thermal parameter of the brake or friction plate, but compared to the friction plate, the effect of thermal con ductivity,specific heat capacity and density of brake disc was much greater than the effect of friction plate~ on the temperature of the friction deputy, the research content can provide a reference for the structural design and material selection of brake.