What are the advantages of cross roller bearings?

What is a Crossed Roller Bearing?

A crossed roller bearing is a high-precision bearing where cylindrical rollers are arranged at 90-degree angles to each other in a "V" shaped groove. This unique design allows a single bearing to handle radial, axial, and moment loads simultaneously, which usually would require two separate bearings.

Features of Crossed Roller Bearing

Integrated Load Support: Capable of handling multi-directional loads in a compact space.

High Rotation Accuracy: Minimal run-out and high repetitive positioning accuracy.

High Rigidity: Excellent stiffness due to the line contact of the cylindrical rollers.

Compact Structure: Saves significant space compared to traditional tapered or angular contact bearing sets.

Types of Crossed Roller Bearings

RB Series (Outer Ring Split Type): The standard type with a split outer ring for high inner ring rotation accuracy.

RE Series (Inner Ring Split Type): Used when high rotation accuracy of the outer ring is required.

RU Series (Integrated Inner/Outer Ring): Features mounting holes for direct installation without a housing or press plate.

RA Series (Compact Type): A thin-walled, lightweight version used where space and weight are critical.

Advantages of Crossed Roller Bearings

Space Efficiency: Replaces the need for multiple bearing rows, reducing the overall size of the machine joint or table.

Simplified Installation: Especially with the RU series, mounting is straightforward due to pre-drilled holes.

High Torque Capacity: Offers high load-carrying capacity relative to its cross-sectional area.

Zero Clearance: Can be preloaded during manufacture to eliminate play and increase precision.

Applications of Crossed Roller Bearings

Industrial Robots: Specifically in waist, shoulder, and elbow joints.

Medical Equipment: Precision imaging machines and surgical robot arms.

Semiconductor Manufacturing: Wafer handling robots and precision alignment stages.

Optical Devices: High-precision telescopes and camera positioning systems.

Crossed Roller Bearing Tips

Proper Preload: Ensure the preload is correctly set; too much can cause overheating, while too little affects accuracy.

Lubrication: Use high-quality lithium-based grease and maintain regular lubrication intervals.

Avoid Shock Loads: While they handle high steady loads well, sudden heavy impacts can damage the "V" grooves.

Supplier of Rotary Table Bearings

BYBearings is a leading specialist in the R&D and manufacturing of high-precision crossed roller bearings and YRT rotary table bearings. They provide a wide range of standard and customized solutions for high-tech industries globally.