高强度制动轮边湿式制动器总成多场耦合下热可靠性分析  

Thermal Reliability Analysis of In-wheel Wet Brake Assembly Under High-intensity Braking with Multi-field Coupling

作　　者：孙冬野[1] 刘升[1] 郝允志[2] 罗勇[3] 王勇[1] 秦大同[1] Sun Dongye;Liu Sheng;Hao Yunzhi;Luo Yong;Wang Yong;Qin Datong(Chongqing University, State Key Laboratory of Mechanical Transmission, Chongqing 400044;Southwest University, Intelligent Transmission and Control Laboratory, Chongqing 400715;Chongqing Automobile College, Chongqing University of Technology, Chongqing 400054)

机构地区：[1]重庆大学机械传动国家重点实验室,重庆400044 [2]西南大学智能传动与控制工程实验室,重庆400715 [3]重庆理工大学重庆汽车学院,重庆400054

出　　处：《汽车工程》2019年第2期161-169,共9页Automotive Engineering

基　　金：国家自然科学基金(51375505和51305475);重庆市基础与前沿研究计划(cstc2013jcyjA60004)资助

摘　　要：针对高强度制动下轮边湿式制动器总成内部热积聚引起车辆可靠性、制动性和经济性的下降,建立该总成及其制动器有限元模型,分析温度场与应力场耦合下紧急制动与持续制动工况的湿式制动器热可靠性。基于键合图理论建立总成热源系统模型后,考虑空气和润滑油对流换热,分析热场与流场耦合下长时间高频制动工况整个总成的热可靠性。结果表明:高强度制动工况湿式制动器总成在应力场、温度场和流场的作用下其热可靠性显著下降,数值模拟与试验结果验证了分析方法正确性和结果有效性。In view of the degradation of reliability, braking performance and fuel economy of vehicle,caused by the heat accumulation in the in-wheel wet brake assembly during high-intensity braking, the finite element models for the assembly and its brake are built to analyze the thermal reliability of wet brake under the coupling of temperature filed and stress field during emergency braking or continuous braking. After the heat source system model of the assembly is established based on bond graph theory, the overall thermal reliability of the assembly under the coupling of thermal field and flow field during long-time high frequent braking is analyzed with consideration of the convective heat transfer of air and lubricant. The results show that under the common actions of stress field, temperature field and flow field, the thermal reliability of the wet bake assembly is significantly lowered during high strength braking and the results of numerical simulation and test verify the correctness of analysis methodology and the effectiveness of outcome.

关 键 词：湿式制动器总成 湿式多片制动器 热应力耦合 热流耦合 可靠性 

分 类 号：U463.5[机械工程—车辆工程]