空压机活塞上一般装有两道气环和两道油环,气环为矩形截面环,不存在装配方向问题,油环为外倒角,活塞环槽下侧面有一倒角并开有回油孔,如图所示:笔者在检修空压机时,经常见到油环倒角朝下的装配方式。按空压机技术要求:“油环倒角应与活塞 Air compressor piston is generally equipped with two gas rings and two oil rings, the ring is a rectangular cross-section ring, there is no assembly direction, the oil ring is the outer chamfer, the lower side of the piston ring groove chamfer and open a back Oil hole, as shown: I overhaul the air compressor, often see the oil ring chamfered downward assembly. Press air compressor technical requirements: "Oil ring chamfer should be with the piston