Transmission (mechanical device)

For other uses of the word "transmission", see Transmission.
"Gearbox" redirects here. For other uses, see Gearbox (disambiguation).

A transmission (also called a gearbox) is a mechanical device invented by Louis Renault (who founded Renault) 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.

A transmission can have a single, or fixed, gear ratio or it can have variable ratios; a variable-ratio transmission can have multiple discrete gear ratios or be continuously variable. Variable-ratio transmissions are used in many kinds of machinery, especially vehicles.

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