(二)活塞环与汽缸套的弹性流体动压润滑上面关于活塞环与缸套润滑分析是基于以下的假设:环和缸套的材料是刚性的,而润滑油的粘度与所受压力无关。但是最近的研究证明:根据活塞环的工作条件和环套的材料以及通常使用的润滑油,利用Johnson的润滑状态图,可以得知:很多现有发动机中的活塞环和缸 (B) Elastomeric Hydrodynamic Lubrication of Piston Rings and Cylinder Liner The above analysis of the lubrication of piston rings and liner is based on the assumption that the material of the rings and liner is rigid and that the viscosity of the lubricant is independent of the pressure applied. However, recent research shows that according to the operating conditions of the piston ring and the materials of the collar and the commonly used lubricating oil, it can be known from Johnson’s lubrication state diagram that the piston rings and the cylinders of many existing engines