What is the primary function of the connecting rod in a small engine?

The primary function of the connecting rod in a small engine is to connect the piston to the crankshaft. This component plays a critical role in the engine's operation by converting the linear motion of the piston—generated as it moves up and down in the combustion chamber—into the rotary motion of the crankshaft. As the fuel-air mixture is ignited, the resulting explosion pushes the piston downward, and the connecting rod transfers this force to the crankshaft, driving the engine and ultimately powering the machine it is attached to. This fundamental interaction is essential for the functioning of all internal combustion engines, making the connecting rod a key component in the engine assembly.