Bearing With Cross Roller

1. Core Definition of the Product​

Crossed cylindrical roller bearings are high-rigidity and compact bearing units specially designed for precision heavy-load rotating scenarios. Their core innovation lies in the unique layout of "cylindrical rollers arranged crosswise at 90°" - rollers are alternately and vertically distributed between the raceways of the inner and outer rings. Through this structure, a single bearing can achieve the composite function of "simultaneously bearing radial loads, bidirectional axial loads, and overturning moments", with rigidity 3-5 times higher than that of traditional deep groove ball bearings and rotational accuracy reaching P4/P5 grade.​

These bearings are designed to address the core needs of "high-precision rotation + high-rigidity support + compact space" in fields such as precision machine tools, robots, and measuring instruments. They are key components that replace multi-bearing combination solutions and improve equipment integration, positioning themselves in the mid-to-high-end precision heavy-load rotating support market.​

2. Product Structure Composition​

Crossed cylindrical roller bearings mainly consist of inner ring, outer ring, cross-arranged cylindrical rollers, cage, optional sealing assembly, and lubrication system. Each component is manufactured using high-precision processes to jointly ensure "high rigidity + high precision" performance. The specific structural parameters and characteristics are shown in the table below:

3. Application Scenarios​

Based on the characteristics of "high rigidity + high precision + multi-directional load bearing" of crossed cylindrical roller bearings, they are widely used in scenarios requiring precision heavy-load rotating support. The specific adaptation logic is as follows:​

Precision Machine Tool Field: For the turntable of CNC vertical lathes and spindle support of horizontal machining centers, they need to bear radial loads (≤80kN), axial loads (≤50kN), and overturning moments (≤30kN·m) generated by cutting. The high rigidity of the bearing (radial rigidity ≥500N/μm) can reduce machining vibration (vibration velocity ≤0.1mm/s), and P4 grade accuracy (radial runout ≤0.005mm) ensures workpiece machining accuracy (roundness error ≤0.003mm). For the grinding wheel spindle support of precision grinders, high rigidity must be maintained at high speeds (≤5000r/min), and the bearing's oil mist lubrication solution can reduce temperature rise during high-speed operation, avoiding thermal deformation affecting grinding accuracy.​

Industrial Robot Field: For the base joints and large arm joints of 6-axis robots, they need to bear the robot's own weight (axial load ≤60kN), end load (radial load ≤30kN), and overturning moments generated by motion inertia. The crossed roller layout of the bearing can balance multi-directional loads, and the high-rigidity design reduces joint deformation (deformation ≤0.002mm), ensuring robot positioning accuracy (repeat positioning error ≤±0.005mm). For the rotating joints of collaborative robots, high precision and low noise must be balanced; the plastic cage and optimized lubrication design can control operating noise at ≤55dB, adapting to human-machine collaboration scenarios.​

Measurement and Testing Equipment Field: For the rotating worktables of coordinate measuring machines and precision turntables of laser interferometers, long-term P4 grade rotational accuracy (axial runout ≤0.003mm) is required. The ultra-precision raceway machining (raceway roughness Ra≤0.2μm) and grouped selection of rollers (diameter difference ≤0.001mm) of the bearing can meet the strict requirements of measuring equipment for accuracy stability (annual accuracy attenuation ≤0.001mm). For the wafer stage rotating mechanism of semiconductor testing equipment, operation in a clean environment (Class 100) is required; the fully sealed structure and low-volatility lubricating grease can avoid pollutant generation, adapting to the cleanliness requirements of semiconductor manufacturing.​

Heavy-Duty Precision Equipment Field: For the rotating support of radar antennas and the feed turntable of satellite ground stations, they need to bear wind loads (radial load ≤100kN), self-weight (axial load ≤80kN), and overturning moments (≤50kN·m) in outdoor environments. The phosphating anti-rust treatment (salt spray test ≥72 hours) and IP55 protection of the bearing can cope with outdoor wind, rain, and dust, and the high-rigidity design ensures antenna pointing accuracy (angle error ≤0.1°). For the simulation turntable of aerospace ground testing equipment, stable performance must be maintained in low-temperature (-30℃) and high-temperature (100℃) environments; ceramic rollers and FKM seals adapt to extreme temperature ranges, meeting the reliability requirements of testing equipment.​

4. Summary of Core Product Advantages​

High Rigidity and Strong Load-Carrying Capacity: The line contact design of crossed rollers results in a contact area 5 times larger than that of ball bearings, with radial rigidity reaching over 500N/μm (about 100N/μm for traditional deep groove ball bearings). It can simultaneously bear radial loads (≤150kN), bidirectional axial loads (≤100kN), and overturning moments (≤50kN·m), adapting to precision heavy-load scenarios.​

High Precision and Stability: P4/P5 grade rotational accuracy (radial runout ≤0.005mm, axial runout ≤0.003mm). Ultra-precision raceway grinding and grouped selection of rollers ensure stable long-term accuracy (annual attenuation ≤0.001mm), meeting the strict accuracy requirements of precision machine tools and measuring equipment.​

Compact Structure and High Integration: A single bearing replaces the combination scheme of "deep groove ball bearing + thrust bearing + support bearing", reducing installation space by more than 40% and equipment weight by 30%. At the same time, it reduces assembly processes by more than 50%, improving equipment integration and assembly efficiency.​

Strong Adaptability to Multiple Scenarios: Temperature adaptation range of -30℃~120℃, IP54/IP55 protection grade, and support for both grease lubrication and oil mist lubrication. It can cope with different environments such as machine tool workshops, outdoor equipment, and clean rooms, adapting to various working conditions from low-speed heavy-load (≤100r/min) to high-speed precision (≤6000r/min).​

Long Service Life and Low Maintenance: Integral quenching of GCr15SiMn steel and logarithmic raceway design ensure a fatigue life of more than 20,000 hours (8,000 hours for ordinary bearings); reserved convenient lubrication holes and standardized sealing components reduce maintenance costs by 25%~30% compared with imported bearings.​

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