Precision Harmonic Reducer Bearing

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Precision Harmonic Reducer Bearing

A harmonic reducer mainly consists of three basic components: a harmonic generator, a flexure, and a rigid wheel. It also includes a rigid bearing (usually a crossed roller bearing) and a flexible bearing (thin-walled deep groove ball bearing).

The inner bore of the flexible bearing mates with the outer ring of an elliptical cam. The outer ring undergoes elastic deformation through rolling balls and mates with the inner diameter of the flexure's opening. The outer circumference of the flexure's opening is machined with teeth that mesh with the teeth of the rigid wheel. Since the rigid wheel has more teeth than the flexure, they mesh at the long axis and disengage at the short axis. The bottom of the flexure is fixed to the output end, while the rigid bearing is installed at the reducer's output end for external connection.

Harmonic reducers are widely used in industries such as robotics, machine tools, and aerospace. They require extremely high precision, rigidity, and load-bearing capacity, thus imposing strict standards on the machining and assembly precision of all components, especially bearing performance.

For rigid bearings, key indicators are rigidity, reliability, and rotational accuracy. Preload is typically applied before shipment to ensure rigidity. For flexible bearings, the maximum radial deformation is the core performance parameter.

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Bearing type Overall Dimension(mm) Installation Hole Size(PCD&SPEC) Weight
D   d C H B   dm dn   dl kg
CSF(G)-14 55    11  16  16.5  13.5  49  8-φ3.5 23  6-M4 17  6-M4 0.15 
CSF(G)-17 62    10  16  16.5  13.5  56  10-φ3.5 27  6-M5 19  6-M5 0.24 
CSF(G)-20 70    14  16  16.5  13.5  64  12-φ3.5 32  8-M6 24  8-M5 0.3 
CSF(G)-25 85    20  18  18.5  16.5  79  16-φ3.5 42  8-M8 30  8-M6 0.45 
CSF(G)-32 112    26  21.5  22.5  19  104  16-φ4.5 55  8-M10 40  8-M8 0.9 
CSF(G)-40 126  24/32 22.5  24  21.5  117  20-φ5 68  8-M10 50  8-M10 1.3 
CSF(G)-50 157  32/40 30  31  28  147  16-φ5.5 84  8-M14 60  8-M14 2.8 
CSF(G)-65 210  44/52 37  39  35  198  20-φ6.5 110  8-M16 80  8-M16 7.9 

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About UKL
Founded in 2020, UKL Bearing Manufacturing Co., Ltd. (Wuxi) is China harmonic drive bearings suppliers and OEM/ODM harmonic drive bearings company, an integrated industrial and trading enterprise that focuses on precision manufacturing, combining R&D, production, and sales.
The company specializes in high-performance bearing solutions, providing technical support for global industries with exceptionally high demands for precision and reliability.

With more than 200 skilled professionals and a fully modernized production base, UKL’s facilities cover the entire manufacturing process — forging, annealing, turning, heat treatment, grinding, and automated assembly.
Leveraging over 15 years of OEM/ODM export experience, UKL responds quickly to customer needs, offering flexible and customized services for clients across Europe, Asia, Africa, and the Middle East.

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