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现代民内燃机的动力储备在很大程度上由活塞环-缸套摩擦副的工作能力所决定,并且首先要由这个摩擦副保证有可靠的润滑条件所决定。应当指出,发动机活塞环-缸套上部润滑油工作条件非常苛刻:活塞环-缸套零件的高温使润滑油粘度急刷下降,接近上死点顶部空间的工作气体压力达到最大值,活塞环处的油膜液体动力压力趋近于零。这样,活塞环与缸套在此区间的接触条件接近于临界状态。此外,当活塞工作行程下行时,活塞的顶环在气缸表面上所形成的润滑油膜厚度,对评定润滑油工作热氧化条件,以及润滑油在发动机整个润
The power reserve of a modern internal combustion engine is to a large extent determined by the ability of the piston-cylinder friction pair to work and is primarily determined by the friction pair’s guarantee of reliable lubrication conditions. It should be noted that the engine piston ring - cylinder liner upper part of the lubricating oil working conditions are very harsh: the piston ring - liner parts of the high temperature lubricant viscosity emergency landing brush down, close to top dead center top of the working gas pressure reaches the maximum piston ring The fluid pressure of the oil film approaches zero. In this way, the piston ring and cylinder liner contact conditions in this interval close to the critical state. In addition, when the working stroke of the piston goes down, the thickness of the lubricant film formed on the surface of the cylinder by the piston’s top ring is critical to assessing the thermal oxidative conditions of the lubricating oil and the lubricants’