游离水对点接触区润滑油成膜特性的影响  

Effect of Free Water on Film Forming Characteristics of Lubricating Oil in Point Contact Zone

作　　者：刘翔[1] 王金涛[1] 张跃[1] 张竟月 李占宏[1] 许常红[1] 佟林[1] 

机构地区：[1]中国计量科学研究院力声所容量密度实验室,北京100029 [2]中国计量大学计量测试工程学院,浙江杭州310018

出　　处：《摩擦学学报》2017年第6期756-767,共12页Tribology

基　　金：国家自然科学基金项目(51605460;51475440);中国博士后科学基金项目(2016M591228);清华大学摩擦学国家重点实验室开放基金项目(SKLTKF16B12)资助~~

摘　　要：水污染作为润滑系统污染的常见形式,对润滑油本身以及机械系统都有巨大的危害.目前关于水分对点接触区润滑特性造成影响的直接观测研究还较少,更多的是通过磨损后的接触副状态来推测可能的破坏机理.因此开展水分存在条件下与润滑接触区油池的相互作用,以及对接触区润滑能力造成影响的研究,能够对探究水分造成的机械元件早期失效机理,开展水污染的防护工作起到理论指导作用.本文作者研究了不同润滑条件下游离水对点接触区成膜特性的影响,提出了游离水对接触区膜厚产生影响的无量纲判据,发现了游离水对点接触润滑油池及轨道的冲刷及乳化作用,是造成接触区膜厚下降及回流减弱的主要原因,直接证明了游离水可造成点接触结构的早期润滑失效.As a main source of oil contamination, water is one of the most importance reasons of failures and life reduction of the lubricant and the mechanical system. Up to now, there is few research about the direct observation and research on the impact of water contamination on the lubrication properties of the contact zone, and the researchers only can infer the possible failure mechanism by the contact worn surface. Therefore, it is important to carry out the research on the influence of the water on the film forming ability of the contact. It helps us to understand the mechanisms of the water induced mechanical failure and to provide theoretical guidance of the water contamination protection work. The influence of water on the film thickness under different lubricating condition has been studied and the dimensionless criterion for the influence of water on the film thickness has been proposed. It is found that the scour and emulsification of free water on the oil pool and the track were the main reasons for the reduction of the film thickness and the oil reflow. The failure of the lubrication of the contact due to free water in early stage is testified.

关 键 词：游离水 点接触区 微量供油 

分 类 号：TH117.2[机械工程—机械设计及理论]