Crankshaft: Spinning mechanical piece that receives the movement of the pistons and transmits it to the gearbox.
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It takes the power of the pistons to the exterior part of the engine so that it can be used. One of its ends it is connected to the gearbox through the clutch, and the other end has a pulley attached to it that transmits movement to the engine's accessories (the water pump, the alternator, etc.).