Which engine component converts the linear motion of the pistons into rotational motion?

The crankshaft is the engine component that converts the linear motion of the pistons into rotational motion. As the pistons move up and down in their cylinders during the combustion cycle, they push against the crankshaft via the connecting rods. The design of the crankshaft allows this linear movement to be transformed into a rotational force that ultimately powers the drivetrain of the vehicle.

This rotational motion is crucial for the engine's operation, as it drives other components, such as the alternator and the transmission, and ultimately provides the necessary power to propel the vehicle forward. The functioning of the crankshaft is fundamental to the overall efficiency and capability of the engine in converting fuel energy into usable power.

In contrast, while the connecting rod plays an integral role in linking the pistons to the crankshaft, it does not itself perform the conversion of motion; rather, it transmits the force generated by the pistons to the crankshaft. The camshaft, meanwhile, is responsible for operating the engine’s valves at the proper timing but does not contribute to the conversion of linear to rotational motion. The timing belt serves to synchronize the camshaft and crankshaft but is not involved in the motion conversion process itself.