What is the main purpose of the crankshaft in an engine?

The main purpose of the crankshaft in an engine is to convert linear motion into rotary motion. As the pistons move up and down in the cylinders due to the combustion of the air-fuel mixture, the crankshaft translates that linear motion generated by the pistons into rotational motion. This rotational motion is crucial because it ultimately drives the vehicle's wheels, providing the power necessary for movement.

The crankshaft's design, featuring offset journals and counterweights, allows it to effectively balance and manage the forces produced by the engine's operation, ensuring smooth power delivery and reducing vibrations. By enabling the effective transfer of energy from the internal combustion process to the drivetrain, the crankshaft plays a pivotal role in the overall function of the engine and vehicle propulsion.