The transmission of the harmonic drive gearbox is a relatively special power transmission method. The harmonic reducer has many advantages such as large transmission ratio, high precision, large carrying capacity, high efficiency, small size, lightweight, etc. It is widely used in space technology and electronics industry, military industry, robotics, packaging machinery, radar communications, CNC machine tools, printing machinery, medical equipment, and other fields that have a very wide range of applications. We generally refer to it as a harmonic reducer, harmonic drive gearbox, or harmony drive motor.

Harmonic drive gearbox core component - crossed roller bearing

The development of harmonic reducers is very fast in the past few years. Harmonic drive technology is becoming more and more mature. As one of the core components of harmonic reducers, crossed roller bearings have also developed rapidly in China in recent years. According to the structure of the harmonic reducer, harmonic drive cross roller bearings can be divided into CSF/CSG series crossed roller bearing, SHF/SHG series harmonic reducer crossed roller bearings, CSD series harmonic drive crossed roller bearings, SHD series harmonic drive gearbox crossed roller bearings, etc.

Products	Structure	Harmonic Reducer Models
		CSF/CSG-14-2UH CSF/CSG-17-2UH CSF/CSG-20-2UH CSF/CSG-25-2UH CSF/CSG-32-2UH CSF/CSG-40-2UH CSF/CSG-50-2UH CSF/CSG-65-2UH
		SHF/SHG-14-2UH SHF/SHG-17-2UH SHF/SHG-20-2UH SHF/SHG-25-2UH SHF/SHG-32-2UH SHF/SHG-40-2UH SHF/SHG-45-2UH SHF/SHG-50-2UH
		CSD-14-2UH CSD-17-2UH CSD-20-2UH CSD-25-2UH CSD-32-2UH CSD-40-2UH CSD-50-2UH

The structure of the harmonic drive motor bearing is slightly different from ordinary crossed roller bearings. Compared with standard crossed roller bearings, there are many installations threaded holes on the inner and outer rings. Besides, the material of harmonic gear reducer bearing is made of high-end GCr15 bearing steel. Both the inner and outer rings are after special heat treatment techniques. The running friction torque stability and rotation accuracy of the cross roller bearing have a significant impact on the tooth meshing force and the stability of the operation of harmonic reducer, and directly affect the service life of it. Therefore, the quality of the harmonic reducer cross-roller bearing directly determines the performance and life of the harmonic reducer.