The engine is like the "heart" of the car, and the piston can be understood as the "center" of the engine. In addition to being in a bad working environment, it is the busiest one in the engine, constantly moving from bottom to top. The stop point, the reciprocating motion from the top dead center to the bottom dead center, suction, compression, work, exhaust, etc., the interior of the piston is hollowed out, more like a hat, the round holes at both ends are connected to the piston pin, the piston pin The small end of the connecting rod is connected, and the large end of the connecting rod is connected with the crankshaft to convert the reciprocating motion of the piston into the circular motion of the crankshaft.
There are three wrinkles at the skirt of each piston, in order to install two gas rings and an oil ring, and the gas ring is on the top. At the time of assembly, the openings of the two gas rings need to be staggered to function as a seal. The role of the oil ring is to scrape off excess oil splashed onto the cylinder wall and evenly distribute the lubricant. Currently widely used piston ring materials are high quality gray cast iron, ductile iron, alloy cast iron and the like.