Cross Roller Bearing

Cross roller bearing has the rollers placed axially perpendicular to each other alternately and therefore are called crossed roller bearings. Disc-shaped spacers separate the rollers instead of a traditional retaining cage. The inner ring or the outer ring is split and held together by retaining rings, and the corresponding outer ring or inner ring is one piece, these bearings are therefore separable.

Highly rigid, compact bearings for complex loads!

According to the precision and size of bearings, crossed roller bearings can be divided into precision crossed roller bearings and crossed roller slewing bearings. Both crossed cylindrical roller slewing bearings and precision crossed roller bearings have the characteristics of high rigidity, high slewing accuracy, stable rotating torque and high bearing capacity. The bearings play a vital role as the core components in the precision slewing equipment. The main factors affecting the slewing accuracy of bearings are bearing manufacturing accuracy and bearing rigidity.

Popular products

RA Series Cross Roller Bearing

RA series crossed roller bearing has high rigidity, loading capacity, and rotation accuracy. It has an integrated inner and separable outer ring; It is suited for where lightweight, compact designs are required, such as the swiveling units of industrial robots or manipulators.

RU Series Cross Roller Bearing

RU series crossed roller bearings have an integrated structure of inner and outer rings, with mounting holes and with washers, their performance is minimally affected by the installation procedure, ensuring stable rotational accuracy and torque.

CRBH Series Cross Roller Bearing

CRBH series crossed roller bearings (Integrated Inner and Outer Rings, Ultra-thin), this model is an ultra-thin RU series bearing; due to the ultra-thin design and no mounting holes in the outer ring and inner ring, The flange and the support base are required to be fixed during installation.

SX Series Cross Roller Bearing

SX series (outer ring split, inner ring rotating type) is similar to the RB series. The outer ring is a two-segmented structure connected by three fixed rings, and the inner ring is designed as one piece. This type has a smaller cross-section than the RB series in the same journal case.

XR/JXR Cross Tapered Roller Bearing

The design of XR/JXR series cross tapered roller bearings can provide higher rotation accuracy and rigidity in a smaller space. This type of bearing is to install two sets of bearing raceways and rollers crosswise at right angles—the adjacent rollers face in opposite directions.

CRBF Series Cross Roller Bearing

CRBF series crossed roller bearing is crossed roller bearing with a compact inner & outer ring, so it has high stiffness, high loading capacity, and high rotation accuracy. CRBF series cross roller bearings can take radial/axial loads and tilting moments at the same time.

Installation instructions for cross roller bearing

The cross roller bearing should be mounted with the following steps:

1. Inspection before mounting the parts:

Wash and clean the bearing base or other mounting parts to remove the dirt and confirm that the burr on the parts has been removed.

2. Mount the bearing into the bearing base or onto the shaft. Because the thin-walled bearing may be mounted tilt, it should be leveled and mounted by beating it evenly with a plastic hammer in the circumferential direction until it is fully contacted with the contact surface can be confirmed with the sound.

3. Side pressing flange mounting

(1) Place the side pressing flange in place, and shake it back and forth several times in the circumferential direction to adjust the positions of the mounting bolts.

(2) Mount the pressing bolts. Tighten the bolts manually and ensure no deviation from the bolt holes.

(3) The pressing bolts can be tightened progressively and diagonally in 3~4 stages. Slightly rotate the integrated inner or outer ring to correct the two divided parts.


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Notes in use of crossed roller bearings:

Please note the size tolerances of the mounting parts, and press securely the inner or outer ring with the flange from the side.

The two-divided imner or outer ring fixed with special rivets or bolts and nuts inseparable. and should be diectly mounted into the bearing base for use. Meanwhile. if the spacer holder assembling sequenceis improper ,it will have a significant impact on the rotation performance of the,the bearing can not be disassembled freely. There is some deviation athe joint of inner or outer ring, before it is mounted into the bearing seat. The bolts to fix the imner or outer ring should be loosened to correct it with a plastic hammer. (the set rivets may be deformed with the bearing base deformation)Do not apply extermal force onto the set rivets orbolts during the mounting or removal.

Features & Applications

“1. Crossed roller bearings can be assembled in all spindle directions and are easy to use.2. crossed roller bearings have low grease consumption due to high rotational efficiency and low heat dissipation. 3. High rotary accuracy due to negative clearance.4. High rigidity, 3-4 times more rigid than conventional bearings.”

Features of cross roller bearings

“Cross roller bearings are with the characteristic of small size, high rotation precision, high loading capacity, and flexible structural design. They are widely used in joint and rotating parts of industrial robots, CNC rotary tables, measuring instruments, medical equipment’s, optical telescopes, radars, etc.”

Application of Crossed Roller Bearings

“The crossed roller bearing has been filled with high-quality two # lithium grease so it can be directly mounted for use. However, it has a smaller internal space. so grease must be replenished periodically. The grease should be replenished from the grease hole connected to the grease groove on the outer and inner rings.”

Lubrication for crossed roller bearing

High-end quality bearing

About Us

EPT Bearing Co, Ltd is an enterprise that majored in research, development, production, and sales of accuracy bearings. According to users’ needs, the company has developed high-accuracy, high-performance, high-quality crossed roller bearings used on industrial robots. The company can produce RA, RB, RE, RU, CRB/CRBC/CRBH series of crossed cylindrical roller bearings and XR/JXR series of crossed tapered roller bearings with the accuracy of Grade P2. The products are widely used in industrial robots, CNC machine tools, reducers, printing machinery, medical equipment, accuracy measurement and control equipment, communication radar antennas, optical equipment, etc.

Frequently Asked

What are the design points of crossed tapered roller bearings?
The design of the cross tapered roller bearing is that the raceway surfaces of the inner ring, the outer ring, and the apex of the roller cone converge on the central axis of the bearing, and the radial load acts on the bearing to produce an axial component of force. Therefore, the two bearings must be used in opposite directions or as a pair of double or double row bearings.
Crossed roller bearings have tapered raceways inside and outside, and the rollers are also tapered. If the cone is extended, its apex will intersect with the bearing axis. Therefore, the rollers of the bearing can achieve pure rolling on the raceway.
What are the advantages of crossed roller bearings?
According to the precision and size of the bearing, the crossed roller bearing can be divided into precision crossed roller bearing and crossed roller slewing bearing. Cross cylindrical roller bearings and precision cross roller rings have high rigidity, high running accuracy, high loading capacity, and stable rotation torque. As the core components in precision swiveling equipment, bearings play a vital role. Manufacturing precision and rigidity are the main factors affecting the bearing rotation accuracy.
How to choose the type of crossed roller bearing?

1. Determine the size range of crossed roller bearings
The external dimension of the crossed roller bearing is one of the important parameters. First of all, you need to know the size of the bearing you need to use.
2. Select the structural form of the bearing
Because crossed roller bearings have the same external dimensions, there are also many kinds of structures, including outer ring split type (RB/RA), inner ring split type (RE), and integral structure (RU/CRBH). The key is to see The part that the bearing needs to drive the rotation needs to be installed on the inner ring or the outer ring of the bearing.
3. Installation method
There are two types of crossed roller bearings in terms of installation methods. One is that the inner and outer rings have mounting holes. Like a slewing bearing, its installation is relatively simple, and it is directly connected to the equipment through connecting bolts; the other is There are no mounting holes in the inner and outer rings, mainly through the interference fit of the bearing seat and the compression flange and the shaft and the inner diameter of the bearing.
4. Carrying capacity
Which kind of cross roller to choose, it is necessary to know whether it can withstand the load imposed by the equipment, and determine whether it is suitable according to the load capacity requirements of the equipment design and the rated load of the corresponding bearing.

How to identify the quality of crossed roller bearings?

1. Check the outer packaging of the bearing
Under normal circumstances, a standard-bearing company with its brand will have its company brand logo, will also have its product packaging, and will arrange for factories that have passed the production conditions to produce product packaging, so whether the packaging is from The lines to the color blocks are very clear, and there will be a logo of your own company.
2. Listen to whether there is noise
Due to the backward production conditions of most counterfeit products and the completely manual workshop operation, impurities such as sand will inevitably be mixed in during the production process, so there will be noises when rotating. You can pick up the bearing. Hold the bearing body sleeve with your left hand, turn the outer sleeve with your right hand to make it rotate, and listen to whether there is any noise.
3. Look at the chamfering treatment
Check whether the processing of the chamfer is uniform. The chamfer is the junction of the horizontal surface and the vertical surface. The chamfer of a good quality bearing is very uniform, and some counterfeit bearings are not mature in these corners due to the immature production technology. The parts are not dealt with very comprehensively.
4. Try to see the quality
In the case of trial, many problems can be seen. If the bearing makes an abnormal noise or is damaged during use, the quality is not good. The quality is good or bad, in addition to checking only after trial to know whether the quality is good or bad.

What are the factors that affect the failure of crossed roller bearings?
In general, it can be considered and analyzed from two aspects: use factors and internal factors. The use factor mainly refers to whether the installation adjustment, use, maintenance, maintenance, etc., meet the technical requirements. The installation condition is one of the first factors in the use factor. Due to improper installation, the bearing often changes in the stress state between the parts of the complete set of bearings. , To make the bearing run in an abnormal condition and fail early. The load, speed, working temperature, vibration, noise, and lubrication conditions are monitored and inspected according to the technical requirements of bearing installation, use, maintenance, and maintenance. If abnormalities are found, the cause will be seen immediately, and the investigation will be carried out to restore it to normal.

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