相对转速对湿式多片离合器磨合过程摩擦磨损特性的影响  

Effect of Rotation Speed on the Friction-Wear Characteristics of a Wet Multi-Disc Clutch during the Running-In Process

作　　者：王茜 马彪[1] 于亮[1] 王立勇[2] 李慧珠[1] 陈小波 WANG Qian;MA Biao;YU Liang;WANG Liyong;LI Huizhu;CHEN Xiaobo(School of Mechanical Engineering,Beijing Institute of Technology,Beijing 100081,China;The Ministry of Education Key Laboratory of Modern Measurement and Control Technology,Beijing Information Science and Technology University,Beijing 100192,China)

机构地区：[1]北京理工大学机械与车辆学院,北京100081 [2]北京信息科技大学现代测控技术教育部重点实验室,北京100192

出　　处：《摩擦学学报》2023年第3期325-336,共12页Tribology

基　　金：国家自然基金(52175037,51975047,518052899);国家博士后基金(2021M700422);机电系统测控北京市重点实验室基金(KF20212223201)资助.

摘　　要：湿式多片离合器摩擦元件磨合过程对其使用寿命和工作品质有重要影响.以铜基粉末冶金摩擦片和30CrMnSiA对偶片为研究对象,针对实车转速工况,使用SAE#2试验台进行湿式离合器循环接合试验.从全局摩擦特性和瞬时摩擦波动性两方面对磨合过程进行研究,应用金相显微镜得到磨合前后摩擦表面微观形貌特征和磨损机理.结果表明:转速的增加降低了磨合初期平均摩擦系数的下降速率及其随后的波动幅度;平均摩擦系数在低转速工况下呈现下降趋势,而高转速工况下呈现上升趋势.虽然提高转速可获得平滑的摩擦表面,并降低瞬时摩擦波动幅度,然而转速过高时,摩擦界面较大温升会使其发生热塑性变形,从而使瞬时摩擦波动越来越剧烈.低转速工况下,摩擦表面微凸体在界面匹配阶段发生严重剪切断裂,而后主要为塑性变形;高转速工况下,微凸体发生渐进式剪切同时伴随弹塑性变形.The running-in process of the freshly manufactured friction components was of great significance to extend the service life of friction components and ensure the stable clutch operation.The effect of rotational speed on the friction and wear properties of the friction components was investigated in a wet multi-disc clutch.Based on actual speed range of the transmission,the running-in experiments of friction components were performed via the SAE#2 clutch tester.The friction discs and separator plates were made of copper-based powder metallurgy and 30CrMnSiA,respectively.The running-in evolutionary process was explored in terms of two aspects:the global friction performance and the instantaneous friction characteristics.Moreover,the friction surfaces before and after experiments were obtained to investigate the micro-morphology characteristics and wear mechanism by a metallurgical microscope.The main conclusions were as follows.The maximum values of the average friction torque and the average friction coefficient showed up at the beginning of the running-in process.Simultaneously,the maximum value of the average friction coefficient decreased with the increase of the rotational speed.At the early running-in process,the average friction coefficient gradually decreased and the corresponding decrease rate was reduced by increasing of the rotational speed;however,the average friction torque barely changed.Under the low rotational speed conditions,the average friction coefficient presented a downward trend and the fluctuation range was extremely large;on the contrary,under the high rotational speed conditions,the average friction coefficient showed an upward trend and the fluctuation range gradually became narrow.Additionally,the running-in process could be divided into two stages:the interface matching stage and the plastic deformation stage.Under low rotational speed conditions,the asperities were severely sheared due to the large contact pressure in the interface matching stage.As the rotational speed goes up,the inc

关 键 词：湿式多片离合器 磨合过程 相对转速 摩擦转矩 磨损机理 

分 类 号：TH117.1[机械工程—机械设计及理论]