Working Conditions Of The Piston

The piston operates under conditions of high temperature, high pressure, high speed, and poor lubrication. The piston comes into direct contact with high-temperature gas, with an instantaneous temperature of over 2500K. Therefore, it is heavily heated and the heat dissipation conditions are poor. Therefore, the temperature of the piston during operation is very high, with the top reaching 600-700K and the temperature distribution being uneven; The top of the piston bears a great deal of gas pressure, especially the maximum power stroke pressure, which can reach 3-5 MPa for gasoline engines and 6-9 MPa for diesel engines. This causes the piston to have an impact and bear the effect of lateral pressure; The piston moves back and forth in the cylinder at a high speed (8-12m/s), and the speed is constantly changing, which generates a large inertial force, causing the piston to be subjected to a large additional load. Pistons working under such harsh conditions will deform and accelerate wear, as well as generate additional loads and thermal stresses, while also being subjected to chemical corrosion from gas.