+ The Structure of a Gear Box (Transmission)
+ Speed Ratio / Gear Ratio / Torque Ration
+ How Gears (Transmission) transfer movement
A Gear Box (Transmission) is a machine in a power transmission system, which provides controlled application of the power. Often the term transmission refers simply to the gearbox that uses gears and gear trains to provide speed and torque conversions from a rotating power source to another device.