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
Drivetrain
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A drivetrain, also known as a transmission system, is the group of components that deliver mechanical power from the prime mover to the driven components. In automotive engineering, the drivetrain is
Rear axle with hypoid bevel gear final drive
Front wheel drive manual transaxle, showing the gearbox and final drive incorporated in the same housing
Construction vehicle drivetrain, with permanent all-wheel drive
A cutaway view of an automotive final drive unit, which contains the differential