The gearbox has the following functions:

1. Acceleration and deceleration, also known as a variable speed gearbox.

2. Changing the transmission direction, for example, we can use two sector gears to transmit force vertically to the other rotating shaft.

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

4. Clutch function: We can separate the engine from the load by separating two originally meshing gears. For example, brake clutch, etc.

5. Distribute power. For example, we can use an engine to drive multiple slave shafts through the gearbox spindle, thereby achieving the function of one engine driving multiple loads.