有些发动机换过活塞环不久,便出现冒黑烟、烧机油、功率下降、起动困难等故障征象。拆开发动机,发现活塞环对口,再换新环,并正确安装,工作几天后,又出现上述情况。这是什么原因呢?试分析如下:新环装入磨损较严重的旧缸套内,其之弹力分布是不均匀的。据测定,开口处的压力约为平均压力的2.85倍,这有利于封闭和保持环的原始安装 Some engines replaced the piston ring soon, there will be black smoke, burning oil, power down, start difficulties and other signs of failure. Open the engine and found the piston ring counterparts, and then a new ring, and the correct installation, a few days after work, and the above situation. What is the reason? Test analysis is as follows: The new ring into the more serious wear of the old cylinder liner, its elastic distribution is uneven. It was determined that the pressure at the opening was about 2.85 times the average pressure, which favored the sealing and retaining of the original installation of the ring