Harmonic drive bearings are crossed cylindrical roller bearings and they can be divided into two types according to the ring construction: with split outer ring and integral inner ring or with integral inner ring and integral outer ring. The cylindrical rollers are arranged vertically at 90° to each other in a V-shaped raceway.
This construction allows the roller bearing to handle radial, axial, and tilting moment loads and improve the stiffness, running accuracy and load carrying capacity. This crossed roller bearing features compact design and mounting holes facilitate mounting and dismounting, which make bearings suitable for various harmonic drives.
Harmonic reducer is usually applied on robots, machine tool, and aerospace industries which have high requiremets on harmonic reducer precision rigidity, and load capacity. So it has high requirements.