Flexible bearing is different from ordinary bearing. Its outer ring is very thin and easy to produce radial deformation. Before the cam is installed, the ring is circular and oval after installation. Harmonic drive transmission uses the controllable elastic deformation of flexible elements to transmit motion and power.
Large transmission ratio, wide application range, high precision, small air return, large bearing capacity, high efficiency, small volume, light weight, stable transmission, low noise, and can transmit motion to the sealed space.
Wave generator, flexible wheel, rigid wheel and flexible bearing. The flexible bearing is the core component. The transmission meets the performance requirements of high reduction ratio through the elastic deformation of the bearing. During the operation of the flexible bearing, the inner ring is installed on the oval rigid wheel, which bears the cyclic stress load during the operation, and the outer ring is installed on the flexible wheel. During the operation, it changes continuously with the elastic deformation of the flexible ina bearing wheel, which not only bears the cyclic stress load, but also bears the alternating stress load.
These characteristics put forward high requirements for the design and manufacture of bearing inner ring, outer ring and cage. Only a few countries such as Japan and the United States can produce them abroad. The design and manufacturing level of flexible bearing for harmonic drive transmission has fully reached the international advanced level. The design of flexible bearing has formed a complete theoretical system, the product manufacturing process is becoming more and more perfect and mature, and the product quality is becoming more and more stable.
The special flexible bearing of 3E series harmonic NSK bearing drive reducer has reliable quality and stable performance. It has been successfully applied to the harmonic drive device of “Shenzhou” and series spacecraft, and has made a contribution to China’s manned aerospace industry.