Crankshafts, Are the main rotating component of an engine.
The main function of crank shaft is conversion of reciprocating motion into rotary motion.
The form which the crankshaft takes varies depending on the type of engine to which it is fitted. All designs are, however, basically the same, as the function they have to fulfil is always the same. The metal in today’s forged and billet steel cranks is also much stronger than the cast irons used in everyday passenger car cranks.