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What are the working environment and tasks of automobile pistons?

Update:04 Jun 2021

The piston is the "heart" of the automobile engine, bea […]

The piston is the "heart" of the automobile engine, bears alternating mechanical load and thermal load, and is one of the key components in the engine with the worst working conditions. The function of the piston is to withstand gas pressure and transmit it to the connecting rod through the piston pin to drive the crankshaft to rotate. The top of the piston is also a component 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. Therefore, the temperature of the piston is very high when working, the top is as high as 600-700K, and the temperature distribution is very uneven; the top of the piston bears The gas pressure is very high, especially the working stroke pressure is the highest, the gasoline engine is as high as 3~5MPa, the diesel engine is as high as 6~9MPa, which makes the piston produce impact and bear the effect of side pressure; the piston moves at a very high speed in the cylinder (8 ~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. Pistons working under such harsh conditions will deform and accelerate wear, and will also generate additional loads and thermal stresses, and are subject to chemical corrosion from the gas at the same time.
HONDA CM6 T07040012 is like the central part of the automobile engine, which occupies an extremely important position when the engine is started. The automobile piston is used to withstand the gas pressure, and the connecting rod drives the crankshaft to rotate through the piston pin. The top of the piston is an integral part of the combustion chamber. The piston moves up and down in the cylinder to complete 4 tasks including inhaling the mixture, compressing the mixture, bearing the explosive force of the mixture after ignition, and exhausting the exhaust gas.

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