Performance Analysis Of New Type Of Brake Drum On Heavy Duty Truck

The development trend of highway transportation is higher speed and heavierduty. So the number of heavy duty truck is becoming larger, the most importantfactors that the buyers consider are price and power. In order to get maximuminterests, the manufacturers try best to reduce the production cost of truck, so atpresent the active safety measures such as acceleration slip regulation in thedomestic truck is difficult to popularize. As one of the important part of brakesystem, the research of the braking drum is relatively slow in our country. Duringthe brake process, the brake drum always bears high temperature and large load,especially in emergency braking. The traffic accidents caused by performance dropor even failure of overheating brake drum attract much more attention. Therefore,the research on high strength brake drum of good heat dissipation is particularlyimportant.Aiming at ameliorating the shortcomings of the traditional brake drum, twokinds of new type of brake drums were put forward by the manufacturer and theywere compared with traditional brake drum on performance. The two kinds of brakedrum included one-way spiral reinforced brake drum and diamond bar reinforcedbrake drum. According to the using environment and performance requirements, thethree kinds of brake drums were contrasted on strength, thermal performance andthermal-structure coupling performance when the brake drums had the same weightand basic dimensions such as friction radius.It was certificated through the factory test that the strength of two kinds ofnew type brake drums was improved, especially the diamond bar reinforced brakedrum. Considering the mutual influence between the external surface shape of thebrake drums and the surrounding air, the fluid-solid coupling analysis wasimplemented with STAR-CCM+. The surface convective heat transfer intensity wascomputed and the air flow field was studied. Then the convective heat transfercoefficient of the brake drum outside surface computed in STAR-CCM+was appliedto the thermal-structural coupling analysis by ANSYS. The thermal analysis wascarried out as the basis of thermal-structure coupling analysis. The emmergencybraking that the vehicle started to slow down with the maximum brakingdeceleration until the vehicle stopped was chosen. Finally the modal analysis ofthree kinds of brake drums was done to study the effects of the structure change ondynamic responses of brake drums.Based on the all analysis, it’s known that the one-way spiral reinforced brake drum improves the flow of the surrounding air with maximum extent and has thebest heat dispersion performance. In the simulation of emergency braking, the strainand stress of it is smallest, so the one-way spiral reinforced brake drum has the mostreasonable structure.