Abstract: We have made an approach to the effect of surface roughness on lubrication properties of piston zing-cylinder by making use of “average” Reynolds equation. The mixed lubrication effect between piston ring-cylinder is also studied. In the studies, we have considered the effect of temperature and overcome the shortcomings existed in the moder in past. Moreover; we have analysed the lubrication properties of piston ring package of S195 diesel, and shown quantitatively the values of friction power losses of S195 in four strokes.

Key words: 表面粗糙度, 缸套, 活塞环, 摩擦, 润滑