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

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 wet multi-plate clutch friction components has a significant impact on their service life and operating performance. Taking copper-based powder metallurgy friction discs and 30CrMnSiA counterface discs as the research objects, wet clutch cyclic engagement tests were conducted on the SAE #2 test bench under real-vehicle rotational speed conditions. The running-in process was studied from two aspects: global friction characteristics and instantaneous friction fluctuation. The microscopic morphology characteristics and wear mechanisms of the friction surfaces before and after running-in were obtained using a metallurgical microscope. The results show that increasing rotational speed reduces the decline rate of the average friction coefficient in the initial running-in stage and its subsequent fluctuation amplitude; the average friction coefficient shows a downward trend under low rotational speed conditions, while it shows an upward trend under high rotational speed conditions. Although increasing rotational speed can obtain smooth friction surfaces and reduce the instantaneous friction fluctuation amplitude, when the rotational speed is too high, the relatively large temperature rise at the friction interface will cause thermoplastic deformation, thereby making the instantaneous friction fluctuation increasingly severe. Under low rotational speed conditions, the asperities on the friction surface undergo severe shear fracture during the interface matching stage, followed mainly by plastic deformation; under high rotational speed conditions, the asperities undergo progressive shear accompanied by elastoplastic deformation.

搜集汇总

背景与挑战

背景概述

该数据集研究了相对转速对湿式多片离合器磨合过程中摩擦磨损特性的影响。通过SAE#2试验台对铜基粉末冶金摩擦片和30CrMnSiA对偶片进行循环接合试验，分析了全局摩擦特性和瞬时摩擦波动性，并利用金相显微镜观察了表面微观形貌和磨损机理。研究发现：转速增加会降低磨合初期平均摩擦系数的下降速率和波动幅度，且平均摩擦系数在低转速下呈下降趋势，在高转速下呈上升趋势；提高转速可平滑摩擦表面并减少瞬时摩擦波动，但转速过高会导致热塑性变形，加剧波动；不同转速下磨损机理各异，低转速以剪切断裂和塑性变形为主，高转速则表现为渐进式剪切和弹塑性变形。