1. Accelerated deceleration, which is often referred to as the variable speed gearbox.
2. Change the direction of the drive. For example, we can use two sector gears to transmit the force vertically to the other.
3. Change the turning moment. Under the same power condition, the faster the speed turns, the smaller the torque the shaft receives, 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.
5. Distributing power. For example, we can use an engine to drive multiple slave shafts through the gearbox main shaft, thus realizing the function of one engine to drive multiple loads.