Robot reducers have the characteristics of high precision, high rigidity, high load, high speed ratio, long life, low inertia, low vibration, low noise, low temperature rise, compact structure, simple installation, etc. Currently, there are two main types used in the field of robot reducers. There are two types, one is harmonic reducer and the other is RV reducer.

As one of the core components in the reducer, bearings are also divided into the following categories according to the reducer, namely crossed roller bearings for harmonic reducers, flexible bearings for harmonic reducers, and angular contact ball bearings for RV reducers. Crossed roller bearings for harmonic reducers include four series, CSG (CSF) series, CSD series, SHG (SHF) series, and SHD series. The naming method adopts the name of the reducer; the flexible bearings for harmonic reducers are named HYR. , the main bearing of the RV reducer is named RV.