湿式制动轴对称摩擦生热与摩擦因数/热磨损特性分析  

Characteristic Analysis of Axisymmetric Friction Heat and Friction Coefficient/thermal Wear of the Wet Type Friction Brake

作　　者：罗天洪[1] 吴小川[1] 罗文军[2] 林超[2] 

机构地区：[1]重庆交通大学机电与汽车工程学院,重庆400074 [2]重庆大学机械传动国家重点实验室,重庆400030

出　　处：《机械传动》2014年第3期114-119,共6页Journal of Mechanical Transmission

基　　金：国家自然科学基金项目(51235537);中央高校基本科研业务费科研专项自然科学类项目(CD-JZR 10280006);重庆市科技攻关项(CSTC.2009AC6077)

摘　　要：多片式湿式摩擦制动器工作中产生大量的摩擦热,引起摩擦工作表面产生局部高温、表面氧化和材料系数变化。其中热疲劳磨损和热摩擦因数两者的变化对制动稳定性的影响非常重要,通过建立基于"轴对称"梯度变化的摩擦热流及对流换热热传导数学模型和摩擦因数及热磨损与相关参数响应特性函数模型,分析了摩擦副的瞬态温度、制动时间与摩擦因数、热磨损量、热磨损率之间的对应分布。分析结果表明:温度、时间的变化对摩擦因数、热磨损有很大的影响,通过控制温度、时间可以改变摩擦副材料的摩擦因数、热磨损量,从而在紧急制动、持续制动过程能够减少事故的发生率,同时在研究新材料的摩擦特性及磨损相关性提供了一定的理论依据。A mass friction heat was generated during the process o{ multi--plate wet type trmtlon brake, which will leading to the local high temperature, surface oxidation and the changing of material coefficient. Among those factors, the change of thermal fatigue and heat friction coefficient is essential to the braking stability. By establishing the mathematical model of friction heat and convective heat transfer based on axisymmetric gradient changing, the transient temperature and the relationship a- mong braking time, friction coefficient, thermal wear volume and thermal wear rate are analyzed. The results show that change of temperature has great influence on friction coefficient and thermal wear, so these parameters can be controlled by adjusting the temperature during working in order to decrease ac- cident incidence during emergency braking or constant braking process. The study provide theoretical basis for the research of friction characteristic and wear relative properties of new materials.

关 键 词：轴对称 热磨损 摩擦因数 对流传热 

分 类 号：U463.51[机械工程—车辆工程]