transmission
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Encyclopedic overview
Transmission internals for a 2009 Volkswagen Golf
A transmission (also called a gearbox) is a mechanical device invented by Louis Renault (who founded Renault) 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.
Excerpted from Wikipedia’s “transmission” article, available under the CC BY-SA 4.0 licence.