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
A transmission 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.
Gear train
…generally have two or more major areas where gear sets are used. For internal combustion engine (ICE) vehicles, gearing is typically employed in the transmission, which contains a number of different sets of gears that can be changed to allow a wide range of vehicle speeds while operating the ICE within a narrower…
Transmission internals for a 2009 Volkswagen Golf
Transmission for a Bristol Sycamore helicopter
16-speed tractor transmission (plus 8 reverse gears)
Mazda M5OD manual transmission (viewed from the engine side)