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
Machine element
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Machine element or hardware refers to an elementary component of a machine. These elements consist of three basic types:structural components such as frame members, bearings, axles, splines, fasteners, seals, and lubricants,
mechanisms that control movement in various ways such as gear trains, belt or chain drives, linkages, cam and follower systems, including brakes and clutches, and
control components such as buttons, switches, indicators, sensors, actuators and computer controllers.
NSK Support Roller cut (cropped)