盘式制动器压力分布状态研究

Research of Pressure Distribution State of Disc Brake

针对盘式制动器在制动过程中存在的变形和高温的问题,将界面摩擦热流和材料热弹变形引入计算模型,以盘式制动器为研究对象,运用数值分析方法,研究盘式制动器在不同工作条件下压力分布特性的变化规律。分析结果表明:制动一定时间后,制动达到稳定状态,压力分布将为固定状态,但由于摩擦材料表面在高温下产生变化,各表面的压力分布情况将不同;通过多次反复制动,接触面的接触压力在接触的过程中径向上发生变化,制动盘两侧压力分布在温度和热变形的作用下差异较大,但在摩擦盘中部差异较小;热流及材料热弹性能对于摩擦材料实际接触面积与名义面积之比将会对产生重要影响,从而影响压力分布。

For the presence problem of high temperature deformation of the disc brake during the braking, the interfacial friction heat and thermo--elastic deformation of materials is introduced into computing model taking the disc brake as the study object and using the method of numerical analysis, the variability law of the pressure distribution characteristic of disc brakes under different operating conditions is studied. The results show that after a certain time of braking, the brake reaches a steady state, the pressure distribution will be a fixed state, but the change of the friction material surface at high temperature, the surface pressure-distribution is different. By repeatedly braking, the surface contact pressure changes occur in the course of the radial contact, the pressure distribution on both sides of the brake disc temperature difference and thermal deformation is larger, but smaller difference in the friction disc portion. The influence of heat and thermal elastic energy on the friction materials actual contact area is more than the nominal area, thus affecting the pressure distribution.