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The force on the crankshaft is transmitted to the piston. Firstly, the gasoline pump draws oil from the fuel tank to the atomizer, which produces a force after atomization and combustion, which drives the movement of the piston. The piston then transmits the force to the crankshaft through the piston rod, which rotates and transmits the force to the gearbox. This way, the car leaves, and the piston rod plays a role in transmitting the force throughout the entire process.