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近代汽车发动机,由于转速高、负荷大,造成气体泄漏严重,因此国内外对于气密另件活塞环的研究,在不断加强。近年来,国外对活塞环的研究,已取得了很大进展,达到了二十万公里不更换活塞环的水平。在往复式活塞发动机中,活塞环按其用途可分为气环和油环两种。气环的工作条件很差,可以认为活塞组的高级保养周期,大都取决于活塞环的使用寿命。特别是第一道气环,在燃烧气体高温、高压的作用下,随同活塞一起在气缸内作往复运动,散热条件很差,润滑困难,在上死点附近几乎处于半干摩擦状态。同时还承受着由燃烧气体产生的酸性物质的腐蚀作用,从而使磨损加剧,弹性逐渐减弱,气密作
Modern automobile engine, due to high speed, heavy load, resulting in serious gas leaks, so at home and abroad for the other parts of the gas-tight piston ring research continues to strengthen. In recent years, foreign research on the piston ring has made great progress, reaching 200,000 km without changing the level of the piston ring. In the reciprocating piston engine, the piston ring can be divided into gas ring and oil ring according to their purpose. Gas ring working conditions are poor, you can think of the piston group of senior maintenance cycle, mostly depends on the life of the piston ring. Especially the first gas ring, under the action of high temperature and high pressure of the combustion gas, reciprocates along with the piston in the cylinder. The cooling conditions are very poor and lubrication is difficult. The semi-dry friction near the top dead center is achieved. At the same time also bear the corrosive effect of acidic substances generated by the combustion gases, so that wear increased, the elasticity gradually weakened, airtight