Crossed Roller Bearings

Crossed-roller bearings are bearings for high-precision applications whose dimensions conform to ISO dimension series 18 as per DIN 616. Due to the X arrangement of the cylindrical rollers, these bearings can support axial forces from both directions as well as radial forces, tilting moment loads and any combination of loads by means of a single bearing position. As a result, designs involving two bearing positions can be reduced to a single bearing position. Crossed roller bearings are very rigid, have high running accuracy and are supplied with normal clearance, low clearance or preload. The bearing outer rings are easily fixed to the adjacent construction using clamping rings.

AUB designs and manufactures a wide range of crossed roller bearings that can accommodate radial, thrust and moment loads simultaneously. The rollers of these compact bearings cross at right angles between the inner and outer rings.

• High rotation accuracy, widely used in machine tools, industrial robots and medical equipment.
• Roller guide options include cage or separator and full complement designs. Both cage and separator types provide a low coefficient of friction for high speed rotation. Full complement bearings handle heavy loads at low speeds.
• Available in sealed and open designs. Sealed bearings feature synthetic rubber seals to keep out dust, dirt and grease.

3 Types of Cross Roller Bearings

• Full-complement cross roller bearings: designed to have a high load capacity and are compact. These are typically the most commonly used type of cross roller bearings.
• Inner-ring split cross roller bearings: offer improved stability and reduced internal clearance. Designed for applications that require a high level of accuracy
• Outer-ring split cross roller bearings: best for applications that require easy mounting and dismounting

The choice of cross roller bearing is dependent on the design requirements of the equipment and and the specific application.

Mounting Hole

• Mounting Hole Type High rigidity crossed roller bearings have mounting holes on the inner and outer rings for easy installation.
• The non-separable design integrates the inner and outer rings into one structure with high rigidity and precision.
• Shaft diameter range from 10 to 90 mm.

High Rigidity

The high rigidity crossed roller bearing adopts a solid one-piece structure with high precision.

• The non-separable design integrates the inner and outer rings into one structure with high rigidity.
• Separator between cylindrical rollers ensures smooth rotation, suitable for high speed.
•  Shaft diameters ranging from 20 to 300 mm.

Standard

Standard crossed roller bearings have a two-piece outer ring that is bolted together to prevent separation during shipping and installation.

• Shaft diameters ranging from 30 to 250 mm.
• Cage and full complement types available.
• CRB and CRBC are available with shaft diameters up to 800 mm.

Crossed cylindrical roller bearings

Crossed cylindrical roller bearings feature cylindrical rollers arranged at 90 degrees in V-shaped raceways separated by spacers. This unique structure enables the bearing to withstand axial loads, radial loads, and overturning moments.

RB Type: Basic type with the outer ring split into two pieces and the inner ring as a single piece, suitable for applications requiring high inner ring rotational precision.

RE Type: Similar to RB type in dimensions but with the outer ring as a single piece and the inner ring split into two pieces, ideal for applications requiring high outer ring rotational precision.

RA Type: Basic type with the outer ring split into two pieces and the inner ring as a single piece, suitable for applications requiring high inner ring rotational precision; a compact type with reduced thickness of both inner and outer rings.

RA-C Type: Similar to RA in dimensions, but with a notch structure in the outer ring providing high rigidity suitable for applications requiring outer ring rotation.

CRBH Type: Features integral inner and outer rings with an ultra-thin design and no mounting holes, requiring flanges and support seats for installation.

RU Type: Features integral inner and outer rings with mounting holes in both, suitable for applications involving rotation of both inner and outer rings.

SX Type: Integral inner ring and split outer ring with an ultra-thin design, no mounting holes, requiring flanges and support seats for installation, suitable for applications requiring inner ring rotation.

Customize Options for crossed cylindrical roller bearings include retainers or separators and full complement roller designs. Both retainer and separator types offer low friction coefficients for high-speed rotation and are available in sealed and open designs with synthetic rubber seals to prevent dust, dirt, and grease ingress.

Advantages of crossed roller bearings

• Capability to bear multi-directional loads due to rollers arranged perpendicular to each other on V-shaped grooves.
• Miniaturization with high rigidity due to minimized dimensions of inner and outer rings, especially in ultra-thin designs near limits.
• High precision with accuracy up to P4, P2 grades, suitable for applications requiring high precision rotation.
• Simplified installation with standard types featuring split outer or inner rings secured together after inserting rollers and retainers, allowing ideal load conditions through fine adjustment of connecting bolts and fixed flanges.
• Excellent rotational accuracy achieved through internal structure preventing roller tilting or friction, effectively preventing increased torque during rotation.
• Diverse types including basic, high rigidity, and ultra-thin types, with different external structures (split inner ring, split outer ring, integral inner and outer ring) and internal structures (full complement rollers, metal cage type, nylon or metal spacer type).
• Various connection methods such as bolted, riveted, and spring disc types.

These characteristics make crossed roller bearings highly suitable for industrial robot joints and rotating parts, rotary tables in machining centers, manipulator rotating parts, precision rotary worktables, medical machinery, and other equipment.