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What is a CRBT Crossed Roller Bearing?

CRBT crossed roller bearings are specifically designed for space-constrained high-precision applications, featuring an integral ultra-thin inner and outer ring structure with precision-ground raceways and 90° orthogonal "X"-shaped cylindrical rollers. They can simultaneously bear radial, axial, and moment loads, with excellent compactness, high rigidity, and low-noise performance. The ultra-thin design eliminates space limitations for small equipment, making them ideal for collaborative robots, special service robots, micro mechanical arms, precision instruments, and other devices requiring reliable load-bearing and precise rotation.

Features of CRBT Crossed Roller Bearing

Split ring design for easy installation: Both inner and outer rings are split into two halves, allowing direct mounting of rollers and rings on the shaft or housing without integral press-fitting. This reduces installation difficulty by 50% compared to integral bearings, especially suitable for large-size or space-constrained equipment.

Superior rigidity and load capacity: Rollers are crossed at 90° and closely arranged, forming line contact with raceways. This design enables simultaneous bearing of radial load, bidirectional axial load, and tilting moment, with rigidity 2-3 times higher than that of ball bearings. The maximum radial load can reach 600 KN, adapting to heavy-duty working conditions.

High rotational accuracy: Available in precision grades P5, P4, P2, with radial runout ≤0.004 mm (P4 grade) and axial runout ≤0.006 mm. Precision-ground raceways (surface roughness Ra≤0.01μm) and rollers ensure smooth rotation and micron-level positioning accuracy.

Low friction and long service life: Optimized roller profile and raceway finish minimize friction losses. Bearing rings and rollers adopt GCr15SiMn alloy steel with surface quenching treatment (HRC 60-64), enhancing wear resistance and fatigue life. Under normal working conditions, the service life can exceed 12,000 hours.

Flexible structural compatibility: The split design supports customized modifications (e.g., mounting holes, flange structures) to match different equipment assembly requirements. Multiple sealing (open, UU/U, LL) and lubrication (grease, oil) options are available for complex environments.

Cost-effective heavy-duty solution: Compared to combined bearing systems (radial + thrust bearings), CRBT integrates multiple load-bearing functions, reducing equipment volume by 40% and overall procurement cost by 20%-30%

Applications of CRBT Crossed Roller Bearing

Heavy-duty machine tools: Core component for large CNC machine tool rotary tables, gantry milling machine spindles, and forging equipment. High rigidity and load capacity withstand heavy cutting forces, ensuring machining accuracy of large workpieces. - Industrial automation: Used in large AGV rotary platforms, robotic arms for heavy-load handling, and precision conveyor systems. The split design facilitates on-site maintenance, while strong load-bearing capacity adapts to heavy-load transportation scenarios.

Aerospace and defense: Applied in aircraft engine test rigs, radar rotating mechanisms, and missile launch platforms. Withstands extreme vibration and impact loads, meeting the high reliability requirements of defense equipment.

Medical devices: Integrated into large medical imaging equipment (e.g., MRI scanners), rehabilitation robots, and precision radiotherapy systems. Low vibration and stable rotation ensure the safety and accuracy of medical procedures.

Industrial machinery: Used in heavy-duty reducers, rolling mill equipment, and large pump rotors. The combined load-bearing capacity adapts to complex loads of industrial machinery, improving operational stability.

Optical and semiconductor equipment: Applied in large lithography machines, wafer processing platforms, and precision optical instruments. High rotational accuracy ensures the precision of microfabrication and optical alignment processes.

Factors Affecting the Price of CRBT Crossed Roller Bearing

Size and load rating: Larger inner diameter (e.g., >600 mm) or higher load rating (e.g., radial load >400 KN) requires more high-quality raw materials and complex split processing, increasing production costs. Ultra-small sizes (inner diameter <30 mm) also have higher processing difficulty and prices.

Precision grade: P2/P4 high-precision bearings are 50%-80% more expensive than P0 grade. Strict grinding, dynamic balance testing, and precision inspection (e.g., laser interferometry) for split rings drive up production costs. - Material quality: Bearings made of SUS440C stainless steel (corrosion-resistant) or ceramic rollers (silicon nitride) are 60%-100% more costly than conventional GCr15 steel. High-temperature alloy materials for extreme environments (≥200°C) further increase prices.

Structural complexity: Customized split ring specifications (e.g., special thickness, mounting hole distribution) or sealed structures (LL maze seal + contact seal combination) add processing steps, increasing costs compared to standard open-type bearings.

Customization requirements: Non-standard size customization, hybrid ceramic roller design, or special lubrication solutions (high-temperature/vacuum) increase design and production costs, raising the unit price by 30%-70%.

Order quantity: Bulk orders (≥200 pieces) enjoy 15%-25% quantity discounts; small-batch (≤30 pieces) or urgent orders (delivery within 15 days) incur additional scheduling and logistics costs.

What Factors Should Be Considered When Purchasing CRBT Crossed Roller Bearing

Operating condition matching: Clarify key parameters such as operating speed (≤1200 rpm for grease lubrication, ≤2000 rpm for oil lubrication), radial/axial load ratio, moment load, working temperature (-40°C to +180°C), and environmental conditions (dust, humidity). Select open-type (high-speed) or sealed-type (complex environments) accordingly.

Size and precision confirmation: Confirm inner/outer diameter, width, and precision grade based on equipment design drawings. For heavy-duty precision machinery (e.g., large CNC rotary tables), prioritize P2/P4 grade; for general industrial equipment, P0/P4 grade balances performance and cost.

Material and sealing selection: Choose GCr15SiMn for general heavy-duty conditions, SUS440C for corrosive environments; select LL maze seal + 2RS contact seal for multi-dust/heavy-humidity scenarios, and open-type for high-speed clean environments.

Supplier qualification assessment: Verify the supplier’s production capacity (e.g., CNC split grinding machines, precision measuring equipment), quality certifications (ISO 9001, CE), and after-sales service. Prioritize suppliers with CRBT specialized production experience to avoid split ring assembly errors.

Cost-effectiveness balance: Compare technical indicators (rigidity, load capacity, life) of different suppliers. Domestic brands like NEWBEE Transmission offer comparable performance to imported brands (e.g., THK) at 30%-40% lower prices, with more flexible customization support for split structures.

Supplier of CRBT Crossed Roller Bearing

NEWBEE Transmission (Luoyang New Bee Transmission Co., Ltd.) is a professional supplier of high-quality CRBT crossed roller bearings, committed to providing reliable, cost-effective heavy-duty bearing solutions for global customers. With advanced R&D and manufacturing capabilities, the company has become a preferred partner in heavy-duty machinery, aerospace, and industrial automation industries.

Comprehensive product range: Covers standard CRBT series with inner diameters 30–1000 mm, outer diameters 80–1200 mm, and widths 20–80 mm. Precision grades range from P5 to P2, including open-type, UU/U-sealed, and LL-sealed options to meet different application needs.

Advanced manufacturing capabilities: Adopts international advanced CNC split grinding machines and 3D laser measuring instruments. Implements strict quality control processes, including roller sorting, split ring precision grinding, and load-bearing performance testing, ensuring product consistency and reliability.

Customization service advantages: Supports non-standard customization (split ring thickness, mounting hole position, flange structure), hybrid ceramic roller design, and special lubrication solutions (high-temperature/extreme-pressure grease). Provides one-stop technical support from design to delivery, adapting to personalized equipment requirements.

Reliable quality assurance: All products comply with ISO 9001 and DIN standards, directly replacing imported brands such as THK and IKO. The company provides a 2-year warranty period and efficient after-sales service, including on-site installation guidance and maintenance training.

Cost-effective supply chain: Localized production and optimized raw material procurement reduce costs. Products are 30%-40% more cost-effective than imported brands, realizing high-quality import substitution for domestic and foreign heavy-duty equipment manufacturers.

Precautions for Using CRBT Crossed Roller Bearing

Standardized installation: For split inner/outer rings, install the two halves symmetrically and tighten connecting bolts evenly (torque according to supplier specifications) to avoid ring deformation. Ensure the installation surface is flat (flatness ≤0.008 mm) and clean, and use positioning pins to align split interfaces.

Scientific lubrication and maintenance: Add extreme-pressure grease (e.g., lithium-based grease with MoS2 additives) before use. Regularly inspect lubricant condition (contamination, oxidation) and replace it every 1500-3000 operating hours. For high-speed or heavy-load conditions, adopt oil circulation lubrication to ensure sufficient heat dissipation.

Avoid overload and extreme conditions: Operate within the rated load and speed range. Overload (exceeding 120% of rated load) may cause roller damage or split ring deformation. Avoid sudden start-stop or operation in extreme temperatures (exceeding -40°C or +180°C) for extended periods.

Regular operation monitoring: Monitor operating temperature (normal temperature rise ≤30°C), vibration, and noise. Abnormal phenomena (e.g., excessive temperature rise, loose split interfaces) indicate potential issues (e.g., insufficient lubrication, misalignment), requiring immediate shutdown inspection.

Proper storage and handling: Store split rings and rollers separately in a clean, dry, and ventilated environment (humidity ≤60%) to avoid moisture and rust. Place split rings horizontally to prevent deformation; during transportation, use shockproof packaging and avoid collision or stacking.

Technical Parameters of CRBT Crossed Roller Bearing

For technical specifications, pricing, or custom engineering solutions:

Email: paul@newbeetrans.com

Website: www.newbeetrans.com