HOW A CRANKSHAF WORKS

How does aCrankshaftwork in a small engine? The crankshaft attaches to a piston by a connecting rod. During each cycle, the crankshaft rotates to push the piston up in the cylinder. Crankshafts rarely break, but if they do, it can cause serious engine damage. If you're doing an engine overhaul, don't forget to replace the crankshaft.
Acrankshaft—related to crank—is a mechanical part able to perform a conversion between reciprocating motionand rotational motion. In a reciprocating engine, it translates reciprocating motionof the pistoninto 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 rodsfrom each cylinder attach.
It is typically connected to a flywheelto reduce the pulsation characteristic of the four-stroke cycle.

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