限量供油条件下硬脂酸吸附对面接触润滑油膜的影响  

The Effect of Stearic Acid Adsorption on Lubricating Oil Film in Slider-on-disc Contact under Limited Lubricant Supply

作　　者：简煜升 荆兆刚 郭峰 黄柏林[2] 韩素立 栗心明 JIAN Yusheng;JING Zhaogang;GUO Feng;WONG Pat Lam;HAN Suli;LI Xinming(School of Mechanical and Automotive Engineering,Qingdao University of Technology,Qingdao 266520;Department of Mechanical Engineering,City University of Hong Kong,Hong Kong 999077,China)

机构地区：[1]青岛理工大学机械与汽车工程学院,青岛266520 [2]香港城市大学机械工程系,中国香港999077

出　　处：《机械工程学报》2023年第21期321-329,共9页Journal of Mechanical Engineering

基　　金：国家自然科学基金资助项目(52175173,51875286)。

摘　　要：在限量供油条件下,利用滑块-盘面接触润滑油膜测量系统研究了PAO10(聚α-烯烃)添加硬脂酸对油膜厚度-滑块倾角关系的影响,理论分析了滑块入口润滑油堆积对润滑油膜承载力的影响,并对硬脂酸在固体表面的吸附进行了表征。结果表明,油膜厚度随滑块倾角的增加呈现总体下降的趋势。硬脂酸吸附诱导的“反润湿”作用,使润滑油在润滑轨道上由经典双侧脊分布转变为离散态条状或液滴状分布,改善了接触区入口供油,提高油膜厚度。实验发现了较低的滑动速度下低供油量反而诱发高油膜厚度的“异常”现象。硬脂酸的吸附使得润滑油在入口区形成非浸润的液滴状堆积,形成的附加拉普拉斯压力增加油膜承载力;当供油量较低时,入口润滑剂堆积的曲率半径较小,附加拉普拉斯压力较大,因此膜厚较高。Under conditions of limited oil supply,the effect of stearic acid oiliness additive is studied on the relationship between oil film thickness of PAO10(polyα-olefin)and inclination angle of the slider with an optical test rig for measuring the film lubrication in the slider-on-disc contact.The influence of lubricating oil accumulation at slider inlet on the bearing capacity of lubricating oil film was analyzed theoretically,and the adsorption of stearic acid on solid surface is characterized.The results show that the film thickness presented an overall decrease with the increase of the inclination angle of the slider.The"dewetting"effect induced by the adsorption of stearic acid changes the lubricant distribution in term of the classical bi-side-ridge to discrete strip/droplet on the lubricating track,which improves the oil supply at the inlet of the contact and increases the thickness of the oil film.Particularly,the experiment found that the lower oil supply at low sliding speed actually induces abnormal higher oil film thickness.The adsorption of stearic acid makes non-wetting droplet-like oil accumulation in the inlet area,and the additional Laplace pressure formed increases the bearing capacity of the oil film;when the oil supply quantity is lower,the radius of curvature of the inlet lubricant accumulation is smaller,and the additional pressure is higher and so the film thickness increases.

关 键 词：硬脂酸 限量供油 倾角 膜厚 面接触 

分 类 号：TH117[机械工程—机械设计及理论]