Crossed roller bearing is TEDIN's main products, contains crossed cylindrical roller bearing and crossed tapered roller bearings. such as: RA/RB/CRB/NRXT/RE/RU/CRB/CRBH/CRBF/XR/JXR series crossed roller bearings. Our products are widely used for industrial robots, rotary tables of machining centers, medical equipment, measuring instruments, rotating parts of manipulators, precision rotary tables, etc.
A crossed roller bearing is a type of rotary bearing that uses cylindrical rollers arranged in a crisscross pattern, with each roller oriented at a 90 degree angle relative to the one adjacent to it. This arrangement allows crossed roller bearings to withstand radial, axial, and moment loads, so they can often replace dual-bearing arrangements, for applications with limited installation space. And because the rollers form line contact with the raceways, crossed roller designs exhibit very high stiffness and minimal deflection under load. These characteristics make crossed roller bearings ideal for rotating motion components such as rotary actuators and rotary ball splines.
Strong Load-bearing Capacity
It can withstand large radial and axial loads, and it can also withstand a certain tilt force.
Good Rigidity
Due to the use of cross-arranged rollers, it has high rigidity and can ensure that excessive deformation and vibration will not occur during high-speed rotation.
High Precision
The manufacturing precision is high, which can ensure the stability and accuracy of its operation.
Long Service Life
Due to the use of high-quality materials and advanced manufacturing processes, it has a long service life.
Easy To Install
Simple structure, easy to install, suitable for various mechanical equipment.
Flexible Operation
Small friction and smooth operation can reduce the energy consumption and temperature of mechanical equipment.
High Reliability
The contact area between the rolling elements and the inner and outer rings is large, so the bearing's load-bearing capacity and fatigue resistance are very good, ensuring long-term stable operation of the equipment.
High Speed
The centrifugal force of the rolling elements is small, so the limit speed of the bearing is high, and it can maintain stability and accuracy under high-speed operation.
Easy To Maintain
It can be easily lubricated and cleaned, reducing maintenance costs.
Environmental Protection
Compared with traditional sliding bearings, crossed roller bearings have a lower friction.
High Quality
We take pride in the craftsmanship of our products and ensure that each one meets our strict standards for quality.
Advanced Equipment
A machine, tool or instrument designed with advanced technology and functionality to perform highly specific tasks with greater precision, efficiency and reliability.
Professional Team
Our professional team collaborate and communicate effectively with one another, and are committed to delivering high-quality results. They are capable of handling complex challenges and projects that require their specialized expertise and experience.
One-stop Solution
At our manufacturing facilities, we provide a complete package that includes everything required to get you started, including training, installation and support.
Competitive Price
We offering a higher-quality product or service at an equivalent price. As a result we have a growing and loyal customer base.
There are several different types of crossed roller bearings available. The most common type is the cylindrical roller bearing. This type of bearing features a cylindrical roller that is held in place by two track-style rings. This design makes them ideal for applications that require high precision and accuracy.
Another type of crossed roller bearing is the spherical roller bearing. This type of bearing features a spherical roller that is held in place by two track-style rings. This design makes them ideal for applications that require high precision and accuracy, but can also withstand heavy loads.
The third type of crossed roller bearing is the tapered roller bearing. This type of bearing features a tapered roller that is held in place by two track-style rings. This design makes them ideal for applications that require high precision and accuracy, but can also withstand heavy loads.
Finally, the fourth type of crossed roller bearing is the needle roller bearing. This type of bearing features a needle-style roller that is held in place by two track-style rings. This design makes them ideal for applications that require high precision and accuracy, but can also withstand heavy loads.
Robotics And Automation
Crossed roller bearings are widely used in robotics and automation systems. Its compact design, high stiffness and excellent accuracy make it ideal for robotic arms, pick and place machines and automated assembly lines. These bearings ensure smooth, precise movement, increasing efficiency and reducing downtime.
Machine Tools
In the machine tool industry, crossed roller bearings are widely used in milling machines, lathes, grinders and other equipment. Their ability to handle both radial and axial loads makes them the first choice for high-precision machining operations.
Semiconductor Manufacturing
The semiconductor industry requires the highest precision and stability during manufacturing processes. Crossed roller bearings offer excellent positional accuracy, low friction and minimal noise, making them suitable for use in semiconductor production equipment such as wafer handlers and inspection machines.
Medical Equipment
Crossed roller bearings play a vital role in medical equipment such as CT scanners, X-ray machines and surgical robots. Their smooth movement and high load-bearing capacity enable precise positioning, allowing for accurate medical imaging and safer surgical procedures.
Aerospace And Defense
Aerospace and defense applications require bearings that can withstand extreme conditions and provide reliable performance. Crossed roller bearings excel in these environments, offering low friction, high stiffness, and resistance to shock and vibration, making them suitable for use in satellite systems, radar equipment, and missile guidance systems.
Optical And Imaging Instruments
Crossed roller bearings are used in a variety of optical and imaging instruments, including telescopes, microscopes and camera lens assemblies. Their smooth rotation and stable motion control help achieve clear, high-quality imaging.
Packaging and Printing
In packaging and printing machines, crossed roller bearings facilitate precise movement of rollers, ensuring precise alignment and consistent print quality. The high stiffness of these bearings also helps prevent vibration, reduce print defects, and increase overall productivity.
Industrial Robots And Cnc Machining
Industrial robots and CNC machining centers rely on crossed roller bearings for precise and repeatable motion, enabling efficient manufacturing processes and improving product quality.
Textile Machinery
Textile machinery such as looms and spinning machines benefit from the high load capacity and precision of crossed roller bearings, resulting in improved fabric quality and reduced equipment maintenance.
Automobile Industry
In automotive applications, crossed roller bearings are used in a variety of components, including steering systems, transmission assemblies and suspension components, ensuring smooth and reliable performance.
The basic structure of crossed roller bearings Crossed roller bearings are composed of inner rings, outer rings, rollers, cages and other parts. Among them, the rollers are cylindrical and distributed between the inner and outer rings. The tight fit between the rollers and the inner and outer rings gives the entire bearing high rigidity and load-bearing capacity.
Working principle of crossed roller bearings When crossed roller bearings work, the rollers are arranged in a cross arrangement, and the contact angles with the inner and outer rings are both 90 degrees. This special structural design enables the bearing to withstand radial force, thrust force and rectangular force at the same time, thus improving the load-bearing capacity and operating stability.
Most ball bearings are made of a type of steel known as high carbon chromium steel, often called chrome steel. This is used for reasons of cost and durability. Bearings are also made from other materials such as stainless steel, ceramics and plastic.Chrome steel will corrode if exposed to moisture so, where corrosion resistance is needed, bearings made from 440 grade stainless steel are often used. This is a very hard, magnetic steel with good corrosion resistance but not suitable for use with salt water and many chemicals. 316 grade stainless steel is used for more corrosive applications but it is much softer so can only be used where loads and speeds are low.Ceramics (zirconia and silicon nitride) are good for very corrosive or extreme temperature use while various types of plastic are suitable for good to very good corrosion resistance although only suitable for low load and low speed. 316 stainless steel bearings, ceramic bearings and plastic bearings are non-magnetic.
Cleaning
When disassembling the cross roller bearing for inspection, first use photography and other methods to make an appearance record. In addition, check the amount of remaining lubricant and sample the lubricant before cleaning the cross roller bearing.
a. The cleaning of the cross roller bearing is divided into rough cleaning and fine cleaning, and a metal grid can be placed on the bottom of the container.
b. When rough washing, use a brush in oil to remove grease or adhesions. At this time, if the cross roller bearing is rotated in oil, be careful that the rolling surface may be damaged by foreign matter.
c. During fine washing, slowly rotate the cross-roller bearing in oil, which must be carried out carefully.
Commonly used cleaning agents are neutral non-water-containing diesel or kerosene, and sometimes warm lye etc. are used as needed. No matter which cleaning agent is used, it must be filtered frequently to keep it clean. After cleaning, immediately apply anti-rust oil or anti-rust grease on the cross roller bearing.
Inspection and Judgment
In order to judge whether the dismantled cross roller bearing can be reused, it is necessary to check its dimensional accuracy, rotation accuracy, internal clearance, mating surface, raceway surface, cage and sealing ring. The inspection results can be judged by those who use inertial cross roller bearings or those who are proficient in cross roller bearings.
Judgment criteria vary according to mechanical performance and importance, inspection cycle, etc. If the following damage occurs, the cross roller bearing must not be reused and must be replaced.
Pollution Control
Crossed roller bearings are sensitive to contamination. Keep the working environment clean and free of dust, dirt and other particles that may enter the bearings. Use seals and guards to protect bearings from external contaminants.
Install Correctly
Make sure crossed roller bearings are installed correctly according to the manufacturer's guidelines. Install the bearings onto the shaft and housing correctly, and avoid using excessive force during installation.
Make An Alliance
Check the alignment of the shaft and housing to make sure they are properly aligned with each other and the bearings. Misalignment can cause premature bearing wear and failure.
01
Roller Arrangement
Crossed roller bearings have two sets of cylindrical rollers arranged at right angles to each other. This arrangement resembles a cross or "X" shape, from which the bearing gets its name.
02
Inner And Outer Rings
Crossed roller bearings consist of two rings: the inner ring (or inner ring) and the outer ring (or outer ring). The inner ring is fixed in place, while the outer ring is free to rotate.
03
Roller Guide
The crossed roller arrangement allows the rollers to contact the inner and outer rings at multiple points simultaneously. This point-contact design provides superior load-carrying capacity and rigidity while minimizing friction.
Extremely Precise Rotation
The rollers are positioned in a 90° vertical crosswise configuration with each other on the inside of the crossed roller bearing. Between the rollers, spacers or spacers are put to prevent the rollers from tilting and the rollers from watching each other, thereby preventing the rotating torque. The rise in price. Furthermore, on one side of the roller, there is no contact or locking phenomena; at the same time, because the inner and outer rings are split constructions, the gap can be changed, and high-precision rotational movement can be produced even when preload is applied.
Installation And Operation Are Simplified
After the rollers and cages have been mounted, they are connected together, making the installation relatively straightforward.
Withstand Greater Axial And Radial Loads
The crossing roller bearing can handle bigger radial loads, axial loads, moment loads, and other loads because the rollers are positioned perpendicular to each other on the 90° V-groove rolling surface through spacers.
Significantly Reduce The Amount Of Area Required For Installation
The inner and outer rings of the crossed roller bearing have been miniaturized to a small size limit, and the ultra-thin structure is close to the small size limit, with high rigidity, making it suitable for the joint or rotating part of industrial robots, as well as the rotating work of machining centers. Tables, rotating sections of manipulators, precision rotating tables, medical devices, measurement instruments, and IC production equipment are only few of the applications.
Dimensions are the most important parameter. First of all, you need to know the size of the bearing you need, or the size of the equipment that needs this bearing, and then you can determine the size of the bearing.
Because cross roller bearings have many structures even with the same external dimensions, there are outer ring split type (RB / RA / SX), inner ring split type (RE), and overall structure ( RU / CRBH). The key depends on whether the part that drives the rotation is installed in the bearing inner or outer ring. If outer ring rotation is required, the inner ring split type must be used; if inner ring rotation accuracy is required, the inner ring integral type must be used. Both the inner and outer ring require higher rotation accuracy, which is suitable for the inner and outer ring overall structure.
According to the installation method, there are two categories of cross roller bearings, one is the inner and outer rings are with mounting holes, slewing bearings, installation is relatively simple, directly connected to the equipment by connecting bolts;The other is that there are no mounting holes in the inner and outer rings, mainly through the bearing housing and the pressure flange and the interference of the shaft and bearing diameter.
Which type of cross roller is used must know whether it can withstand the load imposed by the equipment, and determine whether it is suitable according to the bearing capacity requirements of the equipment design and the rated load of the corresponding bearing.
Crossed roller bearings are available in 3 accuracy classes, P5, P4 and P2. The P2 level accuracy is the highest, and the accuracy of the bearing is determined according to the accuracy requirements of the equipment.
Installation and lubrication
In the cross-roller bearing, since all the high-quality lithium-based grease has been installed, it can be directly installed after use. However, compared with general roller bearings, the volume of the content space is small, and it is a relatively harsh rolling structure for the lubricant, so it is necessary to replenish the grease periodically.
The replenishing grease is carried out through an oil hole that is connected to the oil passage on the inner and outer rings. When the grease is refilled every 6 months to 1 year, please use the same type of grease to replenish it inside the bearing.
At the same time, after the grease is filled, the initial rotation torque will increase in a short time due to the resistance of the grease, and when the excess grease overflows from the sealing portion, it will quickly return to the normal torque value.
Inspection of parts before installation
Clean the housing or other mounting parts, remove dirt, and confirm that the burrs of each part are clear.
Mounting to the bearing housing or shaft
Because it is a thin-walled bearing, it tends to tilt when it is installed. Use a plastic hammer to find the level, and evenly tap it in the circumferential direction, and install it little by little until it can be confirmed by sound that the contact surface is completely tight.
Mounting method of side compression flange
After placing the side compression flange to the position, rock it back and forth several times in the circumferential direction to adjust the position of the mounting bolts.
When installing the compression bolt and tightening the bolt by hand, make sure that the bolt is not screwed in due to the deviation of the bolt hole.
The tightening of the compression bolts can be divided into 3-4 stages from temporary tightening to final tightening. The screws are repeatedly tightened in the order of the diagonal lines. When tightening the compression bolts of the inner ring or the outer ring which are divided into two parts, During the tightening process, the integral outer ring or the inner ring is often slightly adjusted and rotated, so that the deviation of the outer ring or the inner ring divided into two parts can be corrected.
Precautions for use
The inner ring or the outer ring divided into two parts is made of special rivets or bolts. After the nuts are fixed, they cannot be separated and are directly used in the bearing housing. At the same time, if the assembly order of the spacer is wrong, it has a great influence on the rotation performance of the bearing, so please do not disassemble the bearing at will.
The seam of the inner ring or the outer ring may be slightly deviated. Before installing the bearing housing, loosen the bolts that fix the inner ring or the outer ring and correct it with a plastic hammer before installing. (Fixed rivets will deform with the bearing housing)
When installing or disassembling, do not apply external force to the fixing rivet or bolt.
Please pay attention to the dimensional tolerances of the installed components. Pressing the flange from the side can firmly press the inner or outer ring from the side.
Correct Installation of Crossed Roller Bearings
Whether the fork roller bearing is installed correctly affects accuracy, life, and performance. Therefore, the design and assembly departments must fully study the installation of bearings. It is hoped that the installation will be carried out according to the work standards. When installing bearings, you need to use the correct method and pay attention to some installation problems. The details are as follows:
Installation Method
Crossed roller bearings can be divided into two categories in terms of installation methods. One is that both the inner and outer rings have mounting holes. a slewing bearing, its installation is relatively simple and 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 between the bearing seat and the pressing flange and the inner diameter of the shaft and the bearing.
The installation method of the bearing varies depending on the bearing structure, fit, and conditions. Generally, because the shaft rotates mostly, the inner ring requires an interference fit. Cylindrical bore bearings are often pressed in with a press or hot-fitted. In the application scenario of the tapered hole, it is directly installed on the tapered shaft and installed with a sleeve. When installed into the shell, there is generally a lot of clearance fit and there is interference in the outer ring. It is usually pressed in with a press, or there is also a shrink fit method of installing after cooling. When dry ice is used as the coolant and shrink fit is installed, moisture in the air will condense on the surface of the bearing. Therefore, appropriate rust prevention measures are required.
LUOYANG TEDIN BEARING CO., LTD. --owns core production technology of high-end rolling bearings, focusing on R & D high-end bearings, customized bearings, and specially designed precision bearings have been in a leading position of China.
TEDIN has a variety of automatic producing lines and supporting facilities for high-precision roller bearings. The precision grade of the precision bearings can reach P5, P4, P2. TEDIN serves a wide range of customers especially in precision machine tools, rolling mills, precision rotary tables, industrial robots, high-speed railway, track traffic, military Radar, helicopter gunship, wind power, and solar energy, etc.
