An internal combustion engine is a kind of power machine. It is a heat engine that converts the fuel into a power by directly burning the fuel inside the machine.
The internal combustion engine of the internal combustion engine in a broad sense includes not only a reciprocating piston type internal combustion engine, a rotary piston type engine and a free piston type engine, but also a rotary impeller type gas turbine, a jet type engine and the like, but the internal combustion engine is generally referred to as a piston type internal combustion engine.
Piston type internal combustion engines are most commonly used as reciprocating pistons. The piston type internal combustion engine mixes fuel and air and burns in its cylinders, and the released heat generates high temperature and high pressure gas in the cylinder. The gas expansion pushes the piston to work, and then the mechanical work is output through the crank linkage mechanism or other mechanism to drive the driven mechanical work.
Commonly used are diesel engines and gasoline engines. By converting internal energy into mechanical energy, the internal energy is changed by doing work.
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