In current researches on the lubrication of engine piston ring, some were based on a hypothesis that the piston ring is on a flooded lubrication status. Although some others belong to the starved lubrication analysis, the one‐dimensional model, a certain form of starved lubrication status or simplified manner were used. In this paper, on the basis of the equations about the lubricating oil flow‐rate and control volume, a flow model of lubricating oil in the piston ring‐cylinder liner conjunction is established, and the influence of the situation of supplied lubricating oil film at the piston ring inlet on the two‐dimensional starved lubrication characteristics of piston ring for a four‐stroke engine is studied. The results indicate that the lubrication condition at the piston ring inlet has significant impact on the lubrication characteristics of piston ring. When the supplied lubricating oil at the piston ring inlet increases, the minimum film thickness of piston ring will increase, meanwhile the maximum film pressure, asperity contact force, friction force and power loss will decrease. If the film thickness at the piston ring inlet is smaller, the increase of the supplied film thickness can improve obviously the lubrication characteristics of piston ring.

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进气道润滑状态对发动机活塞环润滑特性影响的研究

在当前对发动机活塞环的润滑的研究中，一些研究基于活塞环处于润滑状态的假设。尽管其他一些属于缺乏润滑的分析，但仍使用一维模型，某种形式的缺乏润滑状态或简化方式。本文基于润滑油流量与控制量的方程式，建立了活塞环-缸套结合处润滑油的流动模型，并考察了润滑油膜供给情况的影响。研究了四冲程发动机活塞环的二维饥饿状态下的活塞环入口。结果表明，活塞环进口处的润滑条件对活塞环的润滑特性有重要影响。当在活塞环入口处供应的润滑油增加时，活塞环的最小薄膜厚度将增加，同时最大薄膜压力，粗糙接触力，摩擦力和功率损耗将降低。如果活塞环入口处的膜厚较小，则所提供的膜厚的增加可以明显改善活塞环的润滑特性。