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Crankshaft is the most important part of the engine. It receives the force coming from the connecting rod and turns it into torque through the crankshaft and drives the other attachments on the engine. The crankshaft is subjected to the rotation of the centrifugal force, the periodic variation of the gas inertial force and the reciprocating inertia force, so that the crankshaft bear the role of bending and torsional load. So the crankshaft requires sufficient strength and stiffness, journal surface to wear, work uniform, good balance.