本文主要介绍了在175F汽油机的研制过程中,为了降低机油消耗率,在活塞环设计、活塞设计、控制泄油通畅、控制曲轴箱内压力、控制油底壳内机油油面高度和油勺击油面积等方面,经过多次改进和试验后,研究出一些较为有效的措施。采用这些措施后,175F汽油机的机油耗从12～15克/马力小时降低到3克/马力小时左右。本文最后还介绍了175F汽油机所采用的一组新活塞环的具体结构与尺寸。采用该组活塞环时发动机的机油耗为2.42克/马力小时。 This paper mainly introduces the design of piston ring, piston design, smoothing of oil drain, controlling the pressure in the crankcase, controlling the height of oil level in the oil pan and oil spoon in the development process of 175F gasoline engine, in order to reduce the oil consumption rate. Oil area and so on, after many improvements and tests, to study some more effective measures. With these measures, 175F gasoline engine fuel consumption from 12 to 15 g / h h down to 3 g / h h or so. Finally, this paper also introduces the specific structure and size of a new piston ring adopted by 175F gasoline engine. The engine oil consumption is 2.42 g / hh when this set of piston rings is used.