Because aluminum pistons can withstand gas pressure, the connecting rod drives the crankshaft to rotate through the piston pin, so the top of the
New Car piston is also a component of the combustion chamber. Generally, New Car pistons are divided into three types: diesel pistons,
Fuel Car engine pistons, and general pistons.
The piston bears high temperature and high pressure thermal loads and mechanical loads. Therefore, as a very important energy transmission component in New Car engines, the piston has special requirements for its materials: low density, light weight, good thermal conductivity, and small thermal expansion coefficient; and it has sufficient high temperature strength, wear resistance and corrosion resistance, and good dimensional stability.
When the New Car engine is working, the piston is directly in contact with 2200℃ high temperature gas, and its top temperature is 300℃~400℃, and the temperature is uneven; in the power stroke, the top of the piston is subjected to a large gas pressure, which is 4MPa~5MPa for Fuel Car engines and 8MPa~9MPa for diesel engines, or even higher; in addition, the linear speed of the piston reciprocating in the cylinder can reach 11m/s~16m/s; working under such harsh conditions. The piston is subjected to high temperature, high pressure, thermal load and mechanical load. Therefore, as a very important energy transmission component in New Car engines, the piston has special requirements for its material: low density, light weight, good thermal conductivity, small thermal expansion coefficient; and sufficient high temperature strength, wear resistance and corrosion resistance, good dimensional stability. In addition, it should be easy to manufacture and low cost. And metal aluminum meets all of the above conditions.
In high-speed New Car engines, pistons are usually made of aluminum alloys. Lighter piston weight can produce higher New Car engine speeds, thereby obtaining greater power output.
