Transmission (mechanical device)

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A transmission 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.

Hydraulic automatic transmission (cutaway view)

Transmission for a Bristol Sycamore helicopter

Mazda M5OD manual transmission (viewed from the engine side)

Transmission internals for a 2009 Volkswagen Golf

Gear train

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A gear train or gear set is a machine element of a mechanical system formed by mounting two or more gears on a frame such that the teeth of the gears engage.

Transmission of motion and force by gear wheels, compound train.

Illustration by Georgius Agricola (1580) showing a toothed wheel that engages a slotted cylinder to form a gear train that transmits power from a human-powered treadmill to mining pump.

2 gears and an idler gear on a piece of farm equipment, with a ratio of 42/13 = 3.23:1

Bicycle with toothed belt drive to transmit torque from crank to rear sprocket