Transmission (mechanical device)

Drivetrain transmitting propulsion power

A transmission (also called a gearbox) is a mechanical device which uses a gear set—two or more gears working together—to change the speed, direction of rotation, or torque multiplication or reduction, in a machine. It was invented by Louis Renault (the founder of Renault). It had been anticipated by Carl Benz, who in 1886 used sprockets and chains to and from an auxiliary shaft and a clutch to provide a second, low gear in the first practical car, his belt-driven Patent-Motorwagen Nr.

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