盘式制动器旋转结合面的热-结构耦合特性

为探索盘式制动器制动盘与制动片之间的摩擦生热规律及其热流分配规律,应用有限元软件对汽车紧急制动过程进行模拟,研究了制动器在制动过程中温度场、应力场的分布规律及其变化特征.研究结果表明:在制动过程中,系统的应力场和温度场分布都不均匀,二者沿径向和轴向都有较大的梯度,而沿周向的梯度相对较小;由于热应力和机械应力的作用,制动盘会发生热变形,从而使接触状态改变,并导致压力分布的变化,而接触压力的变化反过来又影响摩擦热流的输入;制动盘的变形既是温度场和应力场耦合作用的结果,也是振动摩擦耦合作用的结果.

Thermal-Structure Coupling Characteristics of Brake's Rotating Joint Surface

In order to explore the frictional heat and the heat distribution between brake disc and friction plate， the process of emergency braking was simulated using the finite element software. The distribution and variation characteristics of temperature field and stress field were studied. The results showed that the distribution of temperature field and stress field is uneven during the braking process. Their gradients in radial and axial directions are greater， but in circumferential direction is relatively smaller. The thermal and mechanical stress will lead to thermal deformation of the brake disc， which can change contact state and pressure distribution. The change of contact pressure will affect the friction heat input. The thermal deformation of the brake disc is not only the coupling result of the temperature and stress fields， but also the coupling result of the vibration and friction.