基于偏态接触表面粗糙度的纸基摩擦材料湿式制动器啮合特性研究  

Study on the Meshing Characteristic of Wet Brake based on the Skewness and Roughness of Paper-base Friction Material

作　　者：罗天洪[1] 李富盈[1] 李春宏 黄兴刚 朱孙科[1] 胡启国[1] 

机构地区：[1]重庆交通大学机电与汽车工程学院,重庆400074 [2]重庆大江信达车辆股份有限公司,重庆401320

出　　处：《机械传动》2013年第12期47-53,72,共8页Journal of Mechanical Transmission

基　　金：国家自然科学基金资助项目(51275537);中央高校基本科研业务费(No.CDJZR10280006);重庆交通大学研究生教育创新基金项目资助

摘　　要：为了提高和改进湿式多片盘式制动器的制动特性,以轮式挖掘机驱动桥的湿式多片式盘式制动器为研究对象,针对湿式制动器纸基摩擦材料的偏态接触表面和粗糙度特性,通过对比Weibull和Gaussian微凸体分布,研究在新摩擦材料阶段、跑合阶段以及磨平阶段材料摩擦系数变化规律和制动啮合特性。分析结果表明,对于微凸体接触压力模型使用Weibull微凸体分布要比使用Gaussian微凸体分布分析效果好,Weibull分布预测制动啮合时间要比使用Gaussian分布长;通过将啮合表面偏态特性带入计算同时结合使用Weibull分布,得出在制动啮合的初始阶段存在一个转矩波动,这是制动阶段产生震颤的主要原因;对于一个斜率为正的摩擦因数-速度曲线能够减小在啮合末期附近的制动转矩增加;通过在计算模型中加入材料的偏态接触表面和粗糙度特性结合Weibull微凸体分布得出计算结果与试验结果符合度高。In order to enhance and improve the braking characteristic of Wet Multiple of Disc Brake（WMDB）, the WMDB of mining engineering truck drive axle is considered as research object. For contact surface skewness and roughness property of paper- based friction material, through comparing the Weibull and Gaussian asperity distribu- tion, the new, run- in and Glazed material friction coefficient variation law and brake meshing characteristic are re- searched. The results indicate that asperity contact pressure model using Weibull distribution had a better analysis ef- fect than using Gaussian distribution and Weibull distribution forecast brake meshing time is also longer than using Gaussian distribution. As calculated by the contact surface skewness and using Weibull distribution. It is found that in the initial stages of brake meshing, a brake torque fluctuation exists to be the main reason for the braking stick - slip vibration. The coefficient of friction - speed curve with a positive slope can reduce the increase of brake torque during the end of the brake meshing. By adding material skewness and roughness of the contact surface features in the calcu- lation model and combining with asperity body Weibull distribution, it shows that calculate results with the test results conform to be a high degree.

关 键 词：湿式制动器 偏态 粗糙度 啮合特性 

分 类 号：U463.5[机械工程—车辆工程]