The Gear Train

Gears work in teams. Two gears working together is called a gear train . The gear on the train to which the force is first applied is called the driver . The final gear on the train to which the force is first applied is called the driven gear. Any gears between the driver and the driven gears are called the idlers .

Notice the arrows on top of the gears. They are showing that the gears move in different directions.