The Gearbox is widely used in the motor, in the wind turbine is often used, and is an important mechanical component, its main function is to wind turbine under the action of the power generated by the transmission to the generator and make it get the corresponding speed. Usually, the speed of the wind turbine is very low, far less than the required speed of the generator generation, must be achieved through the gear box gear pair to increase, so the gear box is called the increase box.

Secondly, the gearbox has the following functions:

1. acceleration and deceleration, is often said that the change gearbox.

2. Change the transmission direction, for example, we can use two sector gears to transfer the force vertically to the other axis of rotation.

3. Change the torque. Under the same power condition, the faster the gear rotates, the smaller the shaft torque, and vice versa.

4. Clutch function: We can separate the engine from the load by separating the two originally engaged gears. Such as brake clutch and so on.

5. Allocate motivation. For example, we can use an engine to drive multiple slave shafts through gearbox spindles, thus realizing the function of one engine driving multiple loads.