Transmission (mechanical device)

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 or direction of rotation in a machine. Many transmissions have multiple gear ratios, but there are also transmissions that use a single fixed-gear ratio.

For other uses of the word "transmission", see Transmission.
"Gearbox" redirects here. For other uses, see Gearbox (disambiguation).
Hydraulic automatic transmission (cutaway view)
Epicyclic gearing diagram, as used in hydraulic automatic transmissions

Most currently-produced passenger cars with petrol or diesel engines use transmissions with 5–8 forward gear ratios and one reverse gear ratio. Electric vehicles typically use a single-speed or two-speed transmission.

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