What is the main function of a crankshaft in an engine?

The main function of a crankshaft in an engine is to convert linear motion into rotational motion. This is a critical process in an internal combustion engine, where the pistons move up and down (linear motion) as a result of combustion. The crankshaft is connected to the pistons through connecting rods, and as the pistons descend and ascend, the crankshaft rotates. This rotational motion is what ultimately drives the vehicle's wheels and powers the engine's functions.

In addition to this primary function, while the crankshaft can influence torque and engine speed indirectly through its rotational motion, these aspects are not its main purpose. The regulation of fuel supply is handled by other components in the engine, such as fuel injectors or carburetors, and does not involve the crankshaft's mechanics. Thus, the correct understanding of the crankshaft's role emphasizes its function in transforming motion types within the engine's operation.