Crossed Roller Bearings

Crossed roller bearings are a type of rotary bearing that are used in a variety of applications. They are known for their high accuracy, rigidity, and load capacity, which makes them ideal for use in high-precision machinery, robots, and other applications where precise rotary motion is required.
Crossed roller bearings consist of two tracks of rollers that are arranged in a 90-degree crossing pattern. This unique design provides high rigidity and load capacity in both the radial and axial directions, which allows for high precision and accuracy in rotary motion.
In addition to their high accuracy and load capacity, Crossed Roller Bearings also offer a number of other benefits, including:
Low profile design: crossed roller bearings have a low profile design, which makes them ideal for use in compact machinery where space is limited.
High speed capacity: crossed roller bearings are capable of operating at high speeds, which makes them ideal for use in high-speed machinery.
Low noise and vibration: crossed roller bearings are designed to have low noise and vibration levels, which helps to reduce noise and wear in high-precision machinery.
High reliability: crossed roller bearings are designed for high reliability and long life, which helps to reduce maintenance costs and improve the overall efficiency of machinery.
In summary, crossed roller bearings are a highly accurate and reliable type of rotary bearing that are ideal for use in high-precision machinery, robots, and other applications where precise rotary motion is required.




XRA (integral inner ring, separate outer ring, ultra-thin) this model is the XRB outer ring thickness reduced to the limit of the compact, structure and XRB outer ring structure, suitable for heavy light, compact design, such as robot and manipulator rotating parts. The three types have the same shape and size. The difference lies in that the outer ring of XRA is transverse section, the outer ring of XRA-C is longitudinalsection, and the outer ring of XRBS series is integral structure.



XRB (integral inner ring, separate outer ring) This model is the basic type of cross roller bearing. The outer ring is divided into two pieces, and the inner ring is an integral structure, which is suitable for occasions requiring inner ring rotation accuracy. XRBC type is built with steel re-holder on the basis of XRB type. It is suitable for the occasion with slightly higher working temperature and speed requirement. It is generally open structure.


XRBH (integral inner and outer ring, ultra-thin), due to the ultra-thin design and no mounting holes for outer and inner rings, flange and support seat are required for installation. In addition, because the outer ring and inner ring are integral structure, installation has no impact on performance, so it can obtain stable rotation accuracy and torque, suitable for the outer ring and inner ring rotation but the size of the occasion.


XRC (integral inner ring, separate outer ring, ultra-thin), in the same journal, this type has smaller than XRB type, the section size of the adoption of ultra-thin design, outer ring and inner ring no mounting holes, and the need to flanges brackets fixed, applicable to the inner ring spinning.


XRE (inner ring split, outer ring as a whole) is also the basic type of cross roller bearing, the size and XRB type is the same, but the structure of the outer ring as a whole, the inner ring is divided into two pieces, it is most suitable for the occasion that requires the outer ring rotation accuracy.




XRU (inner and outer ring as a whole, with mounting holes), because of the mounting holes, do not need to fix flange and support seat during installation. In addition, since both the outer and inner rings are integral, the installation has little impact on performance, thus achieving stable rotation accuracy and torque. Suitable for outer and inner ring rotation. Because XRSU structure is the same as XRU, the thinner design, so compared with XRU has a more compact size shape and higher rotation accuracy, suitable for the installation space is limited and requires higher precision occasions. The XV series has mounting holes on the outer ring, but not on the inner ring.


Cross tapered roller bearings are composed of two rows of bearing raceways perpendicular to each other and a group of tapered rollers arranged at 90° cross each other. The mutual friction between them reduces the rotational torque, and it can withstand radial loads, axial negative combined loads such as load and overturning moment.

Applications of Crossed Roller Bearings

1. Robotics:

Crossed roller bearings play a pivotal role in robotic joints and arms, where precision and rigidity are critical. The compact design and high load-bearing capacity make them ideal for these dynamic applications.

2. Machine Tools:

In the realm of machine tools, where precision machining is paramount, crossed roller bearings find applications in spindle bearings, rotary tables, and other components requiring high accuracy and rigidity.

3. Medical Devices:

Medical equipment, such as CT scanners and robotic surgical systems, benefits from the precision and compact design of crossed roller bearings. These components contribute to the accuracy of diagnostic and surgical procedures.

Crossed roller bearing installation

Inspection of components before installation

Clean and remove dirt from the bearing seat or other installation parts, and confirm whether the burrs of each part have been removed.

Install on the bearing seat or shaft

Because it is a thin-walled bearing, it is easy to tilt during installation. Please use a plastic hammer to find the level and tap it evenly in the circumferential direction, and install it bit by bit until you can confirm by sound that the contact surfaces are completely close.

Installation method of side compression flange

1) After placing the side compression flange in position, rock it back and forth several times in the circumferential direction to adjust the position of the mounting bolts.

2) Install the compression bolts and when tightening the bolts by hand, confirm that there is no deviation in the bolt holes causing difficulty in screwing in the bolts.

3) The tightening of the compression bolts can be divided into 3-4 stages from temporary tightening to final tightening, and the tightening is repeated in diagonal order. When tightening the compression bolts of the inner ring or outer ring that is divided into two parts, often slightly adjust and rotate the integrated outer ring or inner ring during the tightening process, so that the outer ring or inner ring that is divided into two parts can be tightened. 

4) Special design: If you need special structure (such as outer ring with mounting holes, inner ring without holes, etc.), non-standard size, special materials or higher precision requirements, etc., please contact PRS.


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