There are many kinds of reducers with different models, and different types have different purposes: According to the transmission type, it can be divided into gear reducer, worm reducer and planetary gear reducer; According to different transmission stages, it can be divided into single-stage and multi-stage reducers; According to the gear shape, it can be divided into cylindrical gear reducer, bevel gear reducer and bevel cylindrical gear reducer; According to the layout of transmission, it can be divided into deployable, split flow and coaxial reducers.