It is a component of a reciprocating piston engine that converts the kinetic energy of a linear reciprocating motion of a piston into rotational kinetic energy. The crankshaft is mainly composed of a long shaft that can rotate. In order to convert the reciprocating motion into a rotary motion, there will be a "crank arm" or a crank pin portion on the crankshaft, and the axial center of the crankshaft and the crankshaft have radial displacement. The larger end of the piston rod is connected to the crank arm or crank pin of the crankshaft.
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