| With the continuous development of society,automobiles are more and more widely used in life.As the main structure of automobile braking system,brake performance and safety performance are the main reference indicators for judging the excellent comprehensive performance of brakes.Therefore,in view of the high temperature of the car during braking,frequent braking causes the brake to wear,deform and break and fail.This article takes the peripheral disc brake developed by Hubei Zhonger Axle Company as the research object,mainly using multi-physics Field coupling simulation technology to study the heat generation mechanism of this new type of brake,and make a preliminary understanding of the performance of the Circumferential disc brake.First,conduct a thermal-structural coupling analysis,taking the conditions of single braking and continuous braking as conditions,Carry out friction and heat analysis on the Circumferential disc brake,and obtain the cloud diagram of the stress,strain and temperature distribution of the Circumferential disc brake.Discuss the temperature change of the weekly brake disc under different working conditions.Then through the thermo-fluid-solid coupling analysis,with a single brake as the working condition,the air with a wind speed of 5m/s is set at the upper and lower ends of the flange end of the peripheral brake disc to force the brake to perform forced convection to realize the air to the brake.Heat exchange effect,analyze the effect of air cooling,and compare the temperature changes of the weekly brake discs after air cooling.On this basis,combined with a simple bench,the peripheral disc brake is subjected to a continuous braking thermal decay test,and infrared imaging images of the brake are taken from different angles to record temperature changes.Compare the data recorded on the bench with the finite element simulation results to verify the accuracy of the finite element simulation analysis.Provide theoretical support for subsequent vehicle installations.It has important reference significance and practical value for the development of peripheral disc brakes with better braking performance and heat dissipation effect.The research conclusions obtained are as follows:(1)Under a single braking condition,the temperature of the brake first rises rapidly,reaches a peak value of 100.22°C at 2.43 s,and then gradually drops to 98.1°C.The maximum deformation is 0.23 mm,which occurs at the outer circumference of the Circumferential brake disc,and the maximum deformation of the inner circumference is0.1mm,and they are all symmetrically distributed.In continuous braking conditions,the maximum temperature at the end of braking is 170°C,which occurs on the outer circumference of the peripheral brake disc near the place where the force of the outer brake shoe is applied.The maximum stress occurs at the ring where the braking force is transmitted by the inner shoe.(2)In the thermal-fluid-solid coupling analysis,it is concluded that after air cooling is performed on the basis of a single braking condition,the maximum temperature of the Circumferential disc brake is 83.31℃,which is reduced by 14.79℃,and the air cooling effect is average.(3)In the test bench,the temperature measured at the selected point on the outer circumference of the peripheral brake disc after the fifth braking is 111.9°C.The error in comparing the temperature change measured by the test bench with the temperature distribution cloud diagram obtained by the finite element is very large.small.Combining the results of experiments and finite element analysis,it can be concluded that the thermal stress generated during braking affects the temperature distribution on the surface of the Circumferential disc brake,which in turn affects the braking effect of the brake. |
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