Description
Structure of Crossed Roller Bearings
1. Inner Ring
• Mounted on the shaft, with V-shaped or U-shaped raceways.
• Some models feature a split inner ring for easier roller installation.
2. Outer Ring
• Fixed to the housing, with corresponding grooves forming the raceway.
• Split outer ring designs are also available.
3. Cylindrical Rollers
• Arranged at 90° to each other (adjacent rollers perpendicular, one carries radial load, the next carries axial load).
• This design allows a single bearing to simultaneously support radial, axial, and moment loads.
4. Cage or Spacer
• Separates the rollers to prevent mutual friction.
• High-precision models often use resin spacers for low friction and high rigidity.
5. Seals (optional)
• Prevent dust and contaminants from entering the bearing.
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Features and Functions of Crossed Roller Bearings
1. High Rigidity
• The crossed arrangement provides a large contact area, offering higher rigidity than ball bearings.
• Suitable for high-precision positioning and heavy-load applications.
2. Combined Load Capacity
• A single bearing can support radial, bi-directional axial, and moment loads.
• Eliminates the need for multiple bearing combinations, saving space.
3. High Rotational Accuracy
• Clearance can be adjusted to near zero or preloaded.
• Ensures high rotational precision and minimal positioning error.
4. Compact Structure
• Can replace paired angular contact bearings or tapered roller sets, saving installation space.
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3. Typical Applications
• Robotic joints / reducer output shafts (high rigidity, torque support)
• Machine tool rotary tables / CNC worktables
• Optical equipment (telescopes, laser rotation mechanisms)
• Semiconductor equipment (wafer alignment platforms)
• Radar / aerospace rotary mechanisms
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