本文研究了活塞环组刮油能力影响滑油损失的机理,弄清楚了:(1)活塞环组的刮油能力不是每道环的刮油能力的总和,并且,活塞环的布置将影响环组的刮油能力.(2)环组的滑油损失分成两部分——一部分是液动力损失,另一部分是燃气流通过环组时所引起的损失.(3)活塞顶岸越长,以及活塞与气缸壁之间的间隙越小,降低滑油损失也就越有效.(4)为了降低由燃气流引起的滑油损失,第二道活塞环刮油能力比第一道环更重要. In this paper, the mechanism of the oil scraping ability of the piston ring group is studied, and it is clear that: (1) the scraping ability of the piston ring group is not the sum of the scraping ability of each ring, and the arrangement of the piston ring will affect the ring (2) The loss of oil in the ring group is divided into two parts - one is the loss of hydrodynamic force and the other is the loss caused by the flow of gas through the ring set. (3) The longer the piston crown, and The smaller the clearance between the piston and the cylinder wall, the more effective it is to reduce the oil loss. (4) The second piston ring has more oil scraping ability than the first ring in order to reduce the oil loss caused by the gas flow.