摘要
针对高水基球铰副由于在较恶劣工况下存在倾侧偏载效应凸显、磨损和机械效率损失加剧等使其难以满足高压大流量轴向柱塞泵液压动力需求的问题,以球铰副为研究对象,将不同的凹坑布置在滑靴球凹表面,结合理论计算结果并采用CFD(计算流体力学)方法,对球铰副在高水基乳化液中的润滑模型进行数值模拟,通过分析油膜上表面的压力分布、凹坑截面的速度分布,寻求不同表面织构的减磨机理及凹坑几何参数对承载力的影响规律。最后通过试验分析摩擦磨损情况,并与仿真进行对比。研究结果表明:油膜上的压力沿着凹坑的分度圆逐渐减小;乳化液在凹坑中流动时速度最大(位于前半凹坑内);工况参数和几何参数对油膜承载力的影响顺序为坑形>转速>面积率>深径比>高水基乳化液浓度>膜厚;膜厚4.5μm、转速1500 r/min、高水基乳化液浓度3%、深径比0.1、面积率10%的圆柱坑为最优水平组合;3种凹坑的承载力由大到小为圆柱坑>圆锥坑>圆球坑;高水基乳化液浓度3%的摩擦因数最小,在0.2左右。仿真和试验结果均表明,高水基乳化液介质环境下具有凹坑形表面织构的球铰副减阻降摩效果较普通光滑表面突出。获得了高水基球铰副表面织构化对其润滑性能的影响规律,可为提高轴向柱塞泵润滑性能和机械效率提供参考。
In view of the problems that the high water-based spherical joint pair is difficult to meet the hydraulic power demand of high-pressure and large flow axial piston pump due to the prominent tilting eccentric load effect,intensified wear and serious loss of mechanical efficiency under bad working conditions,a series of studies are carried out with the spherical joint pair as the research object.Different pits are arranged on the concave surface of the slipper ball.Combined with the theoretical calculation results,the lubrication model of the ball joint pair in high water-based emulsion is numerically simulated by computational fluid dynamics method.By analyzing the pressure distribution on the upper surface of the oil film and the velocity distribution of the pit section,the wear reduction mechanism of different surface textures and the influence law of the pit geometric parameters on the bearing capacity are sought.Finally,the friction and wear are analyzed through experiments and compared with the simulation.The results show that the pressure on the oil film decreases gradually along the graduation circle of the pit.When the emulsion flows in the pit,its maximum speed is located in the front half pit.The influence order of working condition parameters and geometric parameters on oil film bearing capacity is pit shape>rotating speed>area ratio>depth diameter ratio>high water-based emulsion concentration>film thickness.The optimum horizontal combination is the film thickness 4.5μm,the cylindrical pit with rotating speed of 1500 r/min,concentration of high water-based emulsion is 3%,the depth diameter ratio of 0.1 and the area ratio of 10%.From large to small,the bearing capacity of the three pits is cylindrical pit>conical pit>spherical pit.The friction coefficient of high water-based emulsion concentration of 3%is the smallest,about 0.2.The simulation and experimental results show that the friction reduction effect of ball joint pair with concave surface texture in high water-based emulsion medium is better than that of ordinary smooth surface.The influence of surface texture of high water-based ball joint pair on its lubrication performance is obtained,which can provide a reference for improving the lubrication performance and mechanical efficiency of axial piston pump.
作者
寇保福
李振顺
张涨
李瑞清
KOU Baofu;LI Zhenshun;ZHANG Zhang;LI Ruiqing(School of Mechanical Engineering,Taiyuan University of Science and Technology,Taiyuan 030024,China)
出处
《中国表面工程》
EI
CAS
CSCD
北大核心
2022年第4期172-186,共15页
China Surface Engineering
基金
国家自然科学基金(51904195)
山西省重点研发计划(201803D421041)
山西省基础研究计划(20210302123209)资助项目
关键词
柱塞球铰副
表面织构
高水基乳化液
承载力
ball joint pair of plunger
surface texture
high water base emulsion
bearing capacity
