So, The function of crankshafts is to translate the linear reciprocating motion of a pistons into the rotational motion. Consequently, which are offset from the central axis of the crankshaft to create a rotation about that axis.

Using the example of a four-stroke engine, the crankshaft has four crank throws for connecting the four pistons. During the combustion cycle of the engine, these crank throws act as a lever arm for the piston to push. This is similar to pushing on the end of a wrench when turning a bolt. When the crankshaft completes its rotation, the crank throw will return the piston to the top of its cylinder.

The rear end of the crankshaft extends outside the crankcase and ends with a flywheel flange. Consequently, The flywheels heavy mass helps smooth the pulsation of the pistons firing at different times. Through the flywheel, the rotation makes its way, through the transmission and final drive, to the wheels. The ring gear carries the torque converter, passing drive into the automatic transmission.

The front end of the crankshaft, sometimes called the nose, is a shaft which extends beyond the crankcase. This shaft will be locked to a toothed gear; which drives the valve train through a timing belt or chain. Finally, A pulley which provides power through a drive belt to accessories such as the alternator and water pump.

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