Comprehensive Classification of Cross Roller Bearings: Types, Structures, and Materials

Explore the classification of cross roller bearings by rolling element design, inner/outer ring structures, and materials. Learn how to choose the right type for precision applications.

Introduction
Cross roller bearings are indispensable in applications demanding high rigidity, precision, and multi-directional load capacity. Their versatile designs cater to a wide range of industrial needs, from robotics to machine tools. This guide classifies cross roller bearings based on rolling element design, inner/outer ring structures, and material selection to help you optimize performance for your specific application.

1. Classification by Rolling Element Design

1.1 Cross Cylindrical Roller Bearings

• Structure: Cylindrical rollers arranged at 90° in V-shaped raceways, separated by spacers.
• Load Capacity: Handles axial, radial, and moment loads simultaneously.
• Applications: Rotary tables, industrial robots, and medical equipment.

1.2 Cross Tapered Roller Bearings

• Structure: Tapered rollers perpendicularly aligned with adjacent rollers; roller axis converges at the bearing’s rotational centerline.
• Advantages: Superior high-speed performance and accuracy.
• Applications: Vertical lathes, grinding machine spindles, and precision drilling equipment.

2. Classification by Inner/Outer Ring Structure

2.1 RB Type (Split Outer Ring, Solid Inner Ring)

• Design: Solid inner ring with a two-piece outer ring.
• Benefits: Ideal for applications demanding high inner ring rotational accuracy.

2.2 RE Type (Split Inner Ring, Solid Outer Ring)

• Design: Solid outer ring with a two-piece inner ring.
• Use Cases: Suitable for outer ring rotation precision.

2.3 RU Type (Solid Rings with Mounting Holes)

• Design: Integrated inner/outer rings with mounting holes; no need for flanges or housings.
• Advantages: Stable rotation accuracy and torque retention.

2.4 RA Type (Split Outer Ring, Ultra-Thin)

• Design: Compact, lightweight split outer ring with a solid inner ring.
• Applications: Robot joints and robotic arm rotation units.

2.5 SX Type (Ultra-Thin, No Mounting Holes)

• Design: Slim profile without mounting holes; requires flanges for installation.
• Benefits: Space-saving solution for small-scale equipment.

2.6 RBH & CRBH Types (Ultra-Thin Solid Rings)

• Design: Solid inner/outer rings with ultra-thin profiles.
• Installation: Mounted via flanges; ideal for miniaturized, high-precision systems.

3. Classification by Material

3.1 Flame or Medium-Frequency Hardened Steel

• Materials: 5CrMnMo, 40CrMnMo, 50Mn, or 65# steel (quenched and tempered).
• Hardness: HB229–270.
• Features: Enhanced wear resistance for gears and raceways.

3.2 Standard Material Options

• Tooth Configuration: Available with internal/external gears or toothless designs.
• Mounting Holes: Customizable hole patterns to match machinery requirements.

How to Select the Right Cross Roller Bearing

• Load Type: Choose cylindrical rollers for combined loads or tapered rollers for high-speed precision.
• Space Constraints: Opt for ultra-thin RA or SX types in compact systems.
• Environment: Select hardened materials for high-wear applications.

Conclusion
Understanding the classifications of cross roller bearings ensures optimal performance in your machinery. For tailored solutions or technical support, explore our bearing portfolio or contact our engineering team today.

By leveraging this comprehensive guide, you can make informed decisions to enhance the efficiency, durability, and precision of your equipment.