piston
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the piston is like the central position of the engine, the piston is used to withstand gas pressure, and the connecting rod drives the crankshaft to rotate through the piston pin, and the top of the piston is also an integral part of the combustion chamber
the piston works under the conditions of high temperature, high pressure, high speed and poor lubrication. The piston is in direct contact with the high-temperature gas, and the instantaneous temperature can reach more than 2500K. Therefore, the heating is serious and the heat dissipation conditions are very poor, so the temperature of the piston is very high during operation, the top is as high as 600~700K, and the temperature distribution is very uneven; the top of the piston is subjected to The gas pressure is very large, especially the working stroke pressure is the largest, the gasoline engine is as high as 3~5MPa, and the diesel engine is as high as 6~9MPa, which makes the piston impact and bear the effect of side pressure; ~12m/s) reciprocating motion, and the speed is constantly changing, which produces a large inertial force, which makes the piston subject to a large additional load. When the piston works under such harsh conditions, it will deform and accelerate the wear, and it will also generate additional load and thermal stress, and at the same time, it will be chemically corroded by the gas.
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