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Crank Shaft is essentially the backbone of the internal combustion engine. The Crank Shaft is responsible for the engine's proper operation, and it converts a linear motion to a rotational motion.  

The Crank Shaft is a one-piece casting or forging of heat-treated alloy steel. Counterweights placed opposite the crankpins balance the crankshaft. The crankshaft for some V-6 engine shave spread out or splayed crankpins. A splayed crankpin is split into two parts. Each connecting rod has its own crankpin. This reduces out-of-balance conditions. The output end of the crankshaft has the flywheel or drive plate attached to it. The front end has the gear or sprocket that droves the camshaft, the vibration damper, and the drive belt pulley.

A crankshaft sensor signals the passing of the notches to the computer in the electronic engine control system. The computer then uses this information to calculate engine speed or crankshaft rpm and piston position