A crankshaft—related to crank —is a mechanical part able to perform a conversion between reciprocating motion and rotational motion . In a

reciprocating engine , it translates

reciprocating motion of the piston into rotational motion; whereas in a

reciprocating compressor, it converts the rotational motion into reciprocating motion. In order to do the conversion between two motions, the crankshaft has “crank throws” or “crankpins”, additional bearing surfaces whose axis is offset from that of the crank, to which the “big ends” of the connecting rods from each cylinder attach.

It is typically connected to a flywheel to reduce the pulsation characteristic of the four-stroke cycle, and sometimes a torsional or vibrational damper at the opposite end, to reduce the torsional vibrations often caused along the length of the crankshaft by the cylinders farthest from the output end acting on the torsional elasticity of the metal.

  1. Reciprocating motion , also called reciprocation, is a repetitive up-and-down or back-and-forth linear motion . It is found in a wide range of mechanisms, including reciprocating engines and pumps. The two opposite motions that comprise a single reciprocation cycle are called

strokes .[ citation needed]

A crank can be used to convert

circular motion into reciprocating motion, or conversely turn reciprocating motion into circular motion.



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