Crossed Roller Bearings
Cross Roller Bearings for Harmonic Reducers
BOM manufactures cross roller bearings engineered for harmonic drive reducer output sections. Available in CSG(CSF) split-outer-ring, CSD integral high-rigidity, and SHG(SHF) bolt-mounting configurations, these bearings carry combined radial, axial, and overturning moment loads through 90° alternating cylindrical rollers. Full-specification custom manufacturing and integrated output assemblies are available.
Key Features
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Combined Radial, Axial, and Moment Load Capacity
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Three Series: CSG(CSF), CSD, SHG(SHF)
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High Rotational Precision (P5 / P4 / P2)
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Reducer-Matched Model Designations
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Compact Thin-Section Design
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Full-Specification Custom Manufacturing Available
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High Rigidity Reducer-Matched
BOM manufactures cross roller bearings engineered specifically for harmonic drive (strain wave) reducer output sections. Available in CSG(CSF) split-outer-ring, CSD integral high-rigidity, and SHG(SHF) bolt-mounting configurations, these bearings carry combined radial, axial, and overturning moment loads through 90° alternating cylindrical rollers in V-groove raceways.
- Combined Load Capability: Simultaneous radial, bidirectional axial, and overturning moment loads in a single compact bearing, purpose-designed for the high moment loads at harmonic reducer output shafts
- Three Series Coverage: CSG(CSF) split outer ring for easy roller loading, CSD integral rings for maximum rigidity, SHG(SHF) with bolt holes for direct flange connection, matching each reducer type's structural requirements
- High Rotational Precision: Integral ring structures and precision-ground V-groove raceways maintain stable rotational accuracy after installation, critical for robot joint positioning repeatability
- Preloaded for Zero Play: Factory-applied preload eliminates radial and axial clearance, providing rigid torque transmission and repeatable positioning accuracy at the reducer output
- Compact Axial Height: Low-profile design minimizes axial envelope, enabling shorter and lighter actuator modules without sacrificing load capacity or rigidity
- Sealing & Lubrication: Sealed variants with factory-filled grease for maintenance-free operation in the low-speed, high-torque conditions typical of harmonic drive output stages
Custom Harmonic Reducer Bearing Manufacturing
Integrated Assemblies Engineering Support
BOM manufactures custom cross roller bearings for harmonic reducer applications where standard catalog specifications do not meet design requirements, from modified mounting interfaces and non-standard envelope dimensions to complete bearing-reducer output assemblies machined as a single integrated unit.
- Integrated Output Assemblies: Cross roller bearing integrated with reducer output flange as one precision-machined unit, eliminating assembly stack-up errors and improving overall positioning accuracy of the actuator module
- Mounting Interface Customization: Modified bolt hole patterns, non-standard flange diameters, and custom mounting configurations to match proprietary reducer housings and robot joint structures
- Preload & Clearance Optimization: Application-specific preload settings tuned to the reducer's operating speed, load profile, and required rotational stiffness
- Material & Surface Treatment: Alternative ring and roller materials for corrosive or high-temperature environments; specialized coatings for extended service life
- Customization: Full-specification custom manufacturing available, covering dimensions, materials, coatings, and bearing structure
Dimensions & Load Ratings
CSG(CSF), CSD, and SHG(SHF) series shown | Data source: HONB catalog | Contact us for SHD series and sizes not listed
| Designation | d (mm) | D (mm) | H (mm) | Cr (kN) | C0r (kN) | Mass (kg) |
|---|
Applications
Industrial Robotics & Collaborative Robots
Harmonic reducer bearings power the precision joints of collaborative and industrial robots, delivering smooth, repeatable motion for assembly, material handling, welding, and machine tending applications.
Semiconductor & Wafer Handling
Wafer handling robots and precision positioning stages use harmonic drive actuators with cross roller output bearings for high positioning repeatability. The preloaded bearing eliminates radial and axial play, maintaining rotational accuracy critical in cleanroom automation.
Precision CNC Machine Tools
High-accuracy harmonic reducer bearings support precision spindle drive systems, tool changers, and multi-axis positioning in CNC machining centers with exceptional rotational accuracy and thermal stability.
Medical & Surgical Robotics
Surgical robots and powered rehabilitation exoskeletons use harmonic drives with cross roller bearings for smooth, precise joint motion under high overturning moments. The compact actuator envelope enabled by the low-profile bearing design is essential in articulated surgical instruments and wearable rehabilitation systems.
About BOM Bearing
BOM Bearing is a professional manufacturer of cross roller bearings for harmonic reducers, delivering precision rotary solutions for industrial robotics, semiconductor equipment, machine tools, and medical systems worldwide.
- Quality Assurance: ISO 9001, IATF 16949, and ISO 14001 certified; quality and environmental standards validated at every production stage
- Product Range: CSG(CSF) split-outer-ring, CSD integral high-rigidity, and SHG(SHF) bolt-mounting series covering harmonic reducer sizes 14 through 65
- Custom Manufacturing: Full-specification customization from non-standard dimensions and alternative materials to specialized coatings and complete bearing architecture redesign, engineered to your exact requirement
- Technical Support: Engineering team for reducer-bearing matching, preload optimization, and integrated output assembly design
- Fast Delivery: Efficient production lines and global logistics network ensuring timely delivery worldwide
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Frequently Asked Questions (FAQ)
Why are crossed roller bearings used as the output bearing in harmonic reducers?
Crossed roller bearings arrange cylindrical rollers at alternating 90-degree angles between inner and outer rings. This orthogonal configuration allows a single bearing to carry radial, axial, and moment loads simultaneously with exceptional rigidity in a very thin cross-section. For harmonic reducer output shafts, preloaded cross roller bearings eliminate radial and axial play, providing rigid torque transmission and repeatable positioning accuracy in a compact envelope suited to strain wave gear systems. BOM also manufactures flexible bearings (wave generator bearings) for the input side of harmonic drive units.
What quality standards does BOM apply to harmonic reducer bearings?
BOM manufactures harmonic reducer bearings under ISO 9001, IATF 16949, and ISO 14001 certified quality systems. Every bearing undergoes full-range dimensional inspection and performance testing to ensure smooth rotation, low noise, and repeatable positioning accuracy required by collaborative robots, SCARA systems, and high-precision automation equipment.
Can BOM customize harmonic reducer bearings for non-standard applications?
Yes. BOM manufactures harmonic reducer bearings to customer specifications, covering the full spectrum of customization: dimensions, materials, coatings, and bearing structure. This includes non-standard envelope dimensions, modified mounting hole patterns, custom preload settings, alternative ring and roller materials, and specialized surface treatments. BOM's capability extends to integrated output assemblies, combining the cross roller bearing with the reducer output flange into a single precision-machined unit. The engineering team supports reducer-bearing matching, preload optimization, and application review.
What materials are harmonic reducer bearings manufactured from?
Standard harmonic reducer bearings use high-grade bearing steel (100Cr6 / SUJ2, equivalent to AISI 52100) selected for its combination of hardness, fatigue resistance, and dimensional stability after heat treatment. For applications requiring corrosion resistance or operating in cleanroom environments, BOM manufactures custom bearings in stainless steel (such as SUS440C). Alternative ring and roller materials and specialized surface treatments are available for specific operating conditions; contact BOM engineering with your application requirements.
How do I select the correct size harmonic reducer bearing for my application?
Harmonic reducer bearing sizes are matched to harmonic drive reducer frame sizes (14 through 65). Consult the harmonic drive reducer specification sheet to identify your frame size, then reference BOM's dimensions table above for the corresponding crossed roller output bearing dimensions. For non-standard or specialized applications, contact BOM engineering for application review and custom bearing recommendation.
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