The gear box is an instrumental device that not only reduces the revolution speed of the motor but also makes a torque change according to the ratio.
1. 2 spindles running parallel with each other : Spur Gear, Helical Gear, Internal Gear, etc.
2. 2 spindles crossing each other at a point : Bevel Gear, etc.
3. 2 spindles missing each other : Crossed Helical Gear, Worm Gear, etc.
