Research On The Temperature Rise Characteristics Of Wet Multi-disc Brake

As one of the four major automotive system,the braking system plays a vital role in the safe driving of automobiles.Wet multi-disc brakes have been widely used in construction vehicles such as trackless rubber-tired vehicles with their advantages of large braking torque,good heat dissipation performance,and strong anti-pollution ability.However,due to the complicated road conditions of construction vehicles,there are mamy emergency braking conditions and continuous braking contidions,so abrasion,warping,deformation and braking failure will occur during the braking process,which may sometimes cause serious personal and property safety accidents.Therefore,a mine-used wet multi-disc brake is taken as the research object in this paper,and the temperature rise characteristics of the wet multi-disc brake are studied and the main research contents are as follows:First,Solidworks is used for solid modeling according to the specific model of wet brake,and then the model is imported into ANSYS for thermal-mechanical coupling analysis.According to the theory of heat transfer and tribology,the boundary conditions under specific working conditions are solved,and the emergency braking and continuous braking conditions are simulated and analyzed in a fully coupled manner.By analyzing the circumferential,radial,and axial distribution characteristics of the friction disk in the temperature field and stress field cloud diagram,the distribution laws of temperature field and stress field are summarized.Next,according to the features of the actual operating conditions of the brake and the vehicle parameters,specific braking parameters such as braking torque and brake deceleration are determined under the two different operating conditions in the bench test.The temperature of the friction disc in the circumferential and radial directions is obtained by a data acquisition instrument,and the simulation analysis is compared and demonstrated.Then,the factors that affect the temperature rise of the friction disc from braking conditions and structural parameters are analyzed,and the most important factor that affects the temperature rise of the friction disc is boiled down through orthogonal experiments.Through the Design Expert software,the influence of the interaction of different factors on the temperature rise of the friction disc is analyzed.Finally,the maximum stress point under continuous braking conditions according to the simulation model is determined,and the function curve of the total strain and the number of thermal cycles according to the mason-coffin formula is drawn,so the prediction on the thermal fatigue life of the friction disc under continuous braking conditions is determined.This research is of great significance for reducing the temperature rise and thermal fatigue failure of friction discs and optimizing the design of wet multi-disc brakes.