Slewing Bearings
Crossed Roller Slewing Bearings
BOM manufactures compact crossed roller slewing bearings (slewing rings) in ungeared, external gear, and internal gear configurations. Cylindrical rollers arranged in an alternating 90-degree cross pattern provide line contact, delivering 3–4 times the stiffness of equivalent four-point contact ball slewing rings. Designed for precision automation and robotics, not large-scale wind or crane applications. Full-specification custom manufacturing including gear parameters, mounting interfaces, and bearing architecture redesign is available.
Key Features
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Combined Axial, Radial & Moment Load Capacity
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Ungeared, External Gear & Internal Gear Configurations
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Bolt-On Flange Mounting Without Shaft or Housing
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Sealed & Pre-Lubricated with Relubrication Channels
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Full-Specification Custom Manufacturing Available
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Description
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Crossed Roller Slewing Bearings
High Rigidity Line Contact Geared & Ungeared
BOM manufactures compact crossed roller slewing bearings (slewing rings) for precision rotation applications that demand higher rigidity and positioning accuracy than four-point contact ball slewing rings. Cylindrical rollers arranged in an alternating 90° cross pattern provide line contact, enabling a single-row bearing to carry simultaneous axial, radial, and overturning moment loads with 3–4 times the stiffness of an equivalent ball-type slewing ring. Available in ungeared, external gear, and internal gear configurations for robotics, medical equipment, precision turntables, and automated positioning systems.
- Crossed Roller Principle: Cylindrical rollers alternating at 90° create line contact in V-grooved raceways, delivering simultaneous radial, bidirectional axial, and overturning moment capacity in one compact bearing with significantly higher stiffness than point-contact ball designs
- Slewing Ring Form Factor: Pre-drilled mounting holes on both inner and outer ring flanges for direct structural bolt-on installation, eliminating the need for a separate shaft, housing, or bearing seat
- Gear Drive Options: External gear (teeth on outer ring), internal gear (teeth on inner ring), or ungeared. Gear module, tooth count, and profile engineered to match the drive system
- Sealed & Pre-Lubricated: Elastomer seals on both faces retain lubricant and exclude contamination; grease fittings with internal distribution channels for periodic relubrication in the field
- Compact Precision Design: Engineered for precision automation and robotics with compact cross-sections for space-constrained equipment, not large-scale wind or crane applications
- Customization: Full-specification custom manufacturing available, covering dimensions, materials, coatings, and bearing structure
Custom Crossed Roller Slewing Bearing Manufacturing
Customizable Engineering Support
BOM manufactures custom crossed roller slewing bearings for applications where standard catalog specifications do not meet the dimensional envelope, load case, gear interface, or mounting requirements of the equipment design.
- Gear Customization: Module, tooth count, pressure angle, and profile modification specified to match existing drive pinions and gearboxes; external gear, internal gear, or ungeared configurations
- Non-Standard Dimensions: Custom bore, outer diameter, height, and cross-section geometry for proprietary equipment designs where catalog sizes do not fit
- Mounting Interface: Custom bolt hole count, bolt circle diameter, hole size, and tapped versus through-hole configurations to match existing mounting structures directly
- Material & Surface Treatment: Alternative ring and rolling element materials, coatings, and surface treatments specified to the operating environment, including corrosion-resistant, high-temperature, and cleanroom-compatible options
- Customization: Full-specification custom manufacturing available, covering dimensions, materials, coatings, and bearing structure
Applications
Robotics & AGV Steering
Base rotation joints in industrial robots, collaborative robot pedestals, and AGV steering turrets where a single compact bearing must carry the full weight of the upper structure while providing smooth, precise 360-degree rotation under combined axial, radial, and moment loads.
Medical Imaging & Surgical Equipment
C-arm rotation systems, compact CT gantries, and surgical robot joints require smooth, low-vibration rotation under high overturning moments with precise angular positioning. Crossed roller line contact delivers the rigidity and rotational accuracy these systems demand.
Precision Rotary Tables & Indexing
CNC 4th/5th axis rotary tables, optical inspection turntables, and high-precision indexing mechanisms where the bearing must resist cutting-force deflection or maintain sub-arc-second positioning repeatability under continuous or intermittent rotation cycles.
Packaging & Automation Turntables
Rotary filling turntables, labelling carousels, and automated sorting platforms use crossed roller slewing bearings as the central rotation element. The integrated mounting flange and optional gear drive simplify machine construction while providing the stiffness needed for accurate product handling at speed.
About BOM Bearing
BOM Bearing is a professional manufacturer of crossed roller slewing bearings, delivering compact high-rigidity rotation solutions for robotics, medical equipment, precision machinery, and automated positioning systems worldwide.
- Quality Assurance: ISO 9001, IATF 16949, and ISO 14001 certified, with quality and environmental standards validated at every production stage
- Product Range: Crossed roller slewing bearings in ungeared, external gear, and internal gear configurations, with compact precision designs for automation and robotics applications
- Custom Manufacturing: Full-specification customization from non-standard dimensions and alternative materials to specialized coatings and complete bearing architecture redesign, all engineered to your exact requirement
- Technical Support: Professional engineering team for load analysis, gear selection, bolt pattern design, and fatigue life calculation
- Fast Delivery: Efficient production lines and global logistics network ensuring timely delivery
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Frequently Asked Questions (FAQ)
What is the difference between a crossed roller slewing bearing and a four-point contact ball slewing bearing?
Both are slewing rings that carry combined axial, radial, and moment loads, but they differ in rolling element contact geometry. A four-point contact ball slewing bearing uses ball-to-raceway point contact via gothic-arch raceways and is versatile, lower friction, and cost-effective for general automation. A crossed roller slewing bearing uses cylindrical rollers alternating at 90° with line contact, producing 3–4 times the stiffness and significantly higher load capacity at the same envelope size. Choose crossed roller when the application demands high positioning accuracy, resistance to deflection under load, or higher static load capacity, as is typical in robot bases, precision rotary tables, and medical imaging gantries. Choose four-point ball when moderate loads and smooth, low-friction rotation at higher speeds are the priority.
What factors should I consider when selecting a slewing bearing for my application?
The primary selection factors are load type, required stiffness, rotational speed, and mounting envelope. Slewing bearings carry combined axial, radial, and overturning moment loads simultaneously, so you need to verify all three against the bearing's rated capacity. For applications requiring high positional accuracy and resistance to deflection, crossed roller slewing bearings offer significantly higher stiffness than four-point contact ball types at the same size. Operating speed, duty cycle (continuous vs. intermittent), and environmental conditions (temperature, contamination, corrosion) further influence the choice of bearing type, seal configuration, and lubrication. Contact BOM's engineering team with your load case, speed, and dimensional constraints for a recommendation.
Can BOM manufacture custom crossed roller slewing bearings?
Yes. BOM manufactures crossed roller slewing bearings with custom bore, outer diameter, and height; application-specific gear module, tooth count, and pressure angle; non-standard bolt patterns and mounting interfaces; and alternative materials and surface treatments for specific operating environments. BOM’s capability extends to complete bearing architecture redesign, including integrated drive interfaces, modified seal configurations, and non-standard cross-section geometries that do not exist in any catalog. Contact BOM’s engineering team with your load requirements, drive system details, and dimensional envelope.
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