Piston crank

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This illustration depicts a piston crank, a crucial component within internal combustion engines. Its primary function lies in converting up-and-down movements of pistons into rotational energy, which then powers vehicle transmissions or other machinery. A series of connecting rods attaches to the pistons at one end and the crankshaft at the other. As pistons move upward, they rotate the crankshaft clockwise; conversely, as pistons descend, the crankshaft rotates counterclockwise. The crankshaft's rotation ultimately transmits mechanical power to the vehicle or machinery it is powering.