The speed reducer plays a role of matching the rotational speed and transmitting torque between the prime mover and the working machine or the actuator, and is a relatively precise machine. The purpose of using it is to reduce the speed and increase the torque. It has a wide variety of models, different models, and different types of uses. There are many types of reducers. According to the transmission type, they can be divided into gear reducers, worm reducers and planetary gear reducers. According to the different drive stages, they can be divided into single-stage and multi-stage reducers. According to the gear shape, they can be divided into cylindrical gears. , bevel gear reducer and cone-cylindrical gear reducer; according to the transmission arrangement can be divided into expansion, split and coaxial reducer.