Internal combustion engine includes connecting rod mechanism, body and cylinder head, valve mechanism, oil supply system, lubrication system, cooling system, starting device, etc.
Internal combustion engine is a kind of power machinery. It is a thermal engine that burns fuel inside the machine and directly converts the heat energy it emits into power.
In a broad sense, internal combustion engines include not only reciprocating piston engines, rotary piston engines and free piston engines, but also rotary vane gas turbines, jet engines, etc., but generally speaking, internal combustion engines refer to piston internal combustion engines.
In the past, piston type internal combustion engines were the most common. The piston internal combustion engine mixes fuel and air and burns them in its cylinder. The heat released makes the cylinder produce high-temperature and high-pressure gas. The gas expansion pushes the piston to do work, and then outputs the mechanical work through the crank connecting rod mechanism or other mechanisms to drive the driven machinery to work. Common diesel engines and gasoline engines change internal energy by doing work by converting internal energy into mechanical energy.