Research On The High Temperature Performance Of The Marble-disk Loading Device Of The Dry Type Multi-disc Brake

The dry type multi-disc brake is widely used in heavy tracked vehicles with large braking torque.Due to the closed installation of the multi-disc brake,the contact area of the friction pair is large,and a large amount of heat will be accumulated in the brake power cabin.With the running condition of tracked vehicle becoming more and more complex,the performance requirements of brake are higher and higher.As the core component of the dry type multi-disc brake,the performance of the marble-disk loading device directly affects the braking effect of the brake,so it is particularly important to study the performance of the marble-disk loading device at high temperature.In this paper,based on the finite element analysis theory,the overall temperature rise law of the multi-disc brake and the mechanical properties of the marble-disk loading device at high temperature are studied.The main research contents are as follows:1.A numerical simulation model of the overall temperature field of a multi-disc brake is established.First,the method of loading heat flux density was used to study the temperature distribution law of the brake under high-frequency braking conditions.The temperature field distribution of the brake with and without forced convection cooling was obtained.Then,the temperature distribution difference of each part of the brake with and without forced convection cooling was compared.Finally,the temperature distribution of the brake under emergency braking conditions was analyzed.2.The mechanical properties of the marble-disk loading device at high temperature were studied.First,the high-temperature tensile test of the material was carried out to provide reliable mechanical performance parameters for the simulation analysis;then the mechanical properties of the marble-disk loading device under normal load and the plastic deformation under the action of high temperature and high compression load were analyzed.3.The motion state of the marble is discussed,and the force increasing coefficient function of the marble-disk loading device is proposed under the condition of considering the inertial force.Firstly,the displacement transfer function and the force increasing coefficient function under three different motion states are derived by using the two-dimensional plane model of the marble-disk loading device.Then,the rationality of the application of the displacement transfer function and the force increasing coefficient function is verified by the simulation method.