The crank-link mechanism is the main moving part of the engine to achieve the working cycle and complete the energy conversion. The main parts of the crank linkage can be divided into three groups, the body group, the piston connecting rod group and the crankshaft flywheel group.
The engine has four strokes of intake, compression, work and exhaust. In the power stroke, the crank-link mechanism converts the reciprocating motion of the piston into the rotary motion of the crankshaft, and outputs power externally. In the other three strokes, due to inertia The action in turn transforms the rotational motion of the crankshaft into a reciprocating linear motion of the piston. In general, the crank linkage is the mechanism by which the engine generates and transmits power. It converts the heat generated by the combustion of the fuel into mechanical energy.