Do you know what the function of a piston in a car is?

The piston is the "heart" of an automobile engine, bearing alternating mechanical and thermal loads. Here are some more information about pistons:
1. Impact: piston offset cylinder will not only cause eccentric wear of piston and cylinder liner, which seriously affects its service life, but also affect the sealing performance of cylinder due to excessive clearance on one side, which reduces the starting performance and power performance of the engine. In serious cases, cylinder pulling accidents will occur, so that the engine can not operate normally.
2. Matters needing attention: the maintenance of the engine should check and correct the bending and twisting deformation of the connecting rod strictly in accordance with the technical specifications, and only when meeting the standards can it be loaded.

Action Of Piston

The function of the engine piston is to bear the pressure of combustion gas, which is passed to the connecting rod through the piston pin to push the crankshaft to rotate and output power. The piston is driven by the connecting rod to complete the intake, compression, exhaust three auxiliary stroke work.
The piston is mainly composed of the top, head and skirt. The top of the piston, the cylinder head and the cylinder wall together form the combustion chamber. The role of the piston skirt is to guide the reciprocating movement of the piston in the cylinder and bear the side pressure.

The piston is a reciprocating part in the cylinder of an automobile engine.

The piston works under high temperature, high pressure, high speed and poor lubrication. The piston is directly in contact with the high temperature gas, the instantaneous temperature can reach more than 2500K, therefore, the heat is serious, and the heat dissipation conditions are very poor, so the temperature of the piston is very high, up to 600~ 700K at the top, and the temperature distribution is very uneven; The top of the piston is under great gas pressure, especially the maximum power stroke pressure, gasoline engine up to 3~5MPa, diesel engine up to 6~9MPa, which makes the piston impact, and bear the effect of side pressure; The piston reciprocates in the cylinder at a high speed (8-12m/s), and the speed is constantly changing, which produces a large inertial force, so that the piston is subject to a large additional load. Pistons operating under these harsh conditions can deform and accelerate wear, as well as generate additional loads and thermal stresses, and are subject to chemical corrosion by gas.