REVIEW THE I.C. ENGINE CRANKSHAFT DESIGN AND DEVELOPMENT

Abstract

Crankshaft is the main shaft in the engine to which all the other working parts are directly or indirectly related. It is called as backbone of the engine due to its importance. The main engine shaft driven round by the piston is called Crankshaft. Crankshaft converts reciprocating motion of the piston into rotary motion. Crankshaft rotates at high speeds and bears the stresses due to power impulse during power stroke. Counterweight balance the forces caused due to out of balance of the crank offset from shaft axis.

 Crankshaft of an engine has to be designed for strength and stuffiness against bending and torsion stresses due to gas loads and also to take care of stress due to vibration and provide sufficient bearing area to suit the bearing pressure. Crankshafts have drilled oil passages through which oil flows from the main to the connecting rod bearings. The power impulses tend to setup twisting vibration in the crankshaft. When a piston makes down on its power stroke, it thrusts, through the connecting rod, against a crankpin with a force that may exceed 2 tones and this motion is called torsion vibration.

 However, the front end of the crankshaft is consisting by the gear or sprocket which drives the crankshaft; the vibration damper; and the pulley which drives dynamo, water pump and fan.