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This section provides an overview for cross roller rings as well as their applications and principles. Also, please take a look at the list of 6 cross roller ring manufacturers and their company rankings.
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Crossed roller rings are bearing components that can support loads in various directions simultaneously, such as radial, axial, and moment loads.
It is ring-shaped in appearance. Multiple cylindrical rollers are arranged in series alternately in the ring through spacer retainers on the 90° V-groove shaped rolling surfaces, so that loads from various directions can be supported.
Crossed roller rings are used in many industrial machines. The range of uses is wide, including joints and swivel sections of industrial robots, swivel tables of machining centers, manipulator swivel sections, precision rotary tables, medical equipment, measuring instruments, and IC manufacturing equipment, to name a few. The wide range of uses of our products can be attributed to the following advantages:
Crossed roller rings can support loads in various directions because the rollers are arranged alternately at a 90° angle. Since rollers are used as rolling elements, large loads can be supported.
Also, since the rollers are arranged in alternating rows perpendicular to each other, the cross rollers can support loads from various angles.
There are six main types of crossed roller rings:
Since the RU type has a seated structure with integral inner and outer rings, there is virtually no effect on performance due to assembly, and the rotational accuracy and torque are stable. The RU type is also characterized by the fact that it does not require a flange housing.
The RB type is the basic form of crossed roller rings, in which the outer ring is divided into two parts and the inner ring is a single piece. It is characterized by the fact that it is used where rotational precision is required in the inner ring.
The RE type has the same dimensions as the RB type, but this type is used where the rotational accuracy of the outer ring is required.
The RB/RE type-USP series exceeds the world's highest accuracy standards and is a top class in precision.
The RA shape has the thinnest possible thickness of the inner and outer rings of the RB shape.
The RA-C type has the same dimensions as the RA type, but can also be used for outer ring rotation. The RA-C type has a one-part split outer ring structure and features high rigidity, even for the outer ring.
The wall thickness of the housing in which the crossed roller rings are mounted must be determined in consideration of the rigidity of the part. Insufficient strength will cause deformation of the bearing and uneven roller contact inside, leading to premature breakage and deterioration of rotational accuracy.
The wall thickness of the housing should be designed to be at least 60% of the cross-sectional height of the crossed roller ring. In addition, if a tapped hole is drilled for removal, the crossed roller ring can be removed without putting a load on it, preventing damage at the time of removal.
When installing the push flange to secure the crossed roller ring, the order in which the bolts are tightened is also important. In order to tighten the bearings evenly, it is important to tighten the diagonal screws little by little and assemble them so that the tightening is uniform.
Thus, when using a high-precision rotating mechanism, it is necessary to pay attention not only to the machining accuracy of the crossed roller rings but also to the machining accuracy of the mounting parts and the assembly method.
Crossed roller rings can be pressurized in the same way as ordinary ball bearings. Applying pressurization increases the support of rigidity and rotational accuracy. On the other hand, since rotational friction increases, care must be taken when calculating rotational power.
Pressure is usually applied by setting the radial clearance to a negative value. The recommended dimensional tolerance of the housing and shaft to which the crossed roller ring with applied pressure is attached is g5/H7, and the fit must be set so that the ring does not clamp. If the fit is tightened, the internal stress will be high due to excessive pressure, which may cause breakage.
*Including some distributors, etc.
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THK Co., Ltd. was incorporated in 1946 and is headquartered in Tokyo, Japan. THK is a manufacturer and supplier of machine components such as linear motion components for customers globally. THK’s products are used in many industries including electronics, aerospace, industrial robots, and precision instruments. THK’s primary product categories are Linear Motion, Feed Screw, Rotation, Custom Assemblies, and Seismic Isolation. Linear Motion products assist in linear motion and transportation. They include linear motion actuators, guides, and rollers. Feed screws include ball screws, screw nuts, and change nuts. Seismic Isolation includes both large systems and small guides.
Luoyang Yujie Industry & Trade Co., Ltd (YOGIE) is a Chinese manufacturer of machinery parts and equipment that was established in Luoyang City, Henan in 2004. The company primarily produces machinery equipment such as CNC lathes and machine tools, as well as machinery parts including bearings, couplings, and end covers. It also offers contract manufacturing of various molds (e.g. casting molds, plastic molds) and non-standard parts such as sugar factory or steel mill machinery parts. YOGIE chiefly serves the petroleum, mining, cement, and steel industries, as well as clients in the snack foods industry such as Nanning Sugar Industry Co.
THK Co., Ltd., established in 1971 and headquartered in Tokyo, Japan, is a manufacturer that develops and produces mechanical components. The company manufactures a wide range of mechanical components, including linear motion systems, LM guides, ball splines, ball screws, and electric actuators. It also offers roller guides, slide packs, link balls, linear bushings, and cam followers. Its products are designed to provide accurate and smooth linear or rotational movement, ensuring precise positioning and motion control. The company has achieved ISO 9001 certification for its quality management systems. It serves a range of industries, including automotive, aerospace, medical, and semiconductor manufacturing.
Nippon Thompson Co., Ltd. - IKO is based in Japan and was established in 1950 as a manufacturer of bearings. The company designs Linear Motion Rolling guides and Mechatronics series and they were the first to produce Needle Roller Bearings. These products have vast applications in various industries as they are used in Electronics-related Devices and Equipment like semiconductors and for precision devices that are used in laboratory measuring instruments and medical equipment. Textile, printing, construction, transportation, and robotics are also on the list of industries that benefit from IKO products.
Number of Employees
Newly Established Company
Company with a History
*Including some distributors, etc.
*Including some distributors, etc.
| Country | Number of Companies | Share (%) |
|---|---|---|
|
Japan
|
3 | 50.0% |
|
China
|
2 | 33.3% |
United States of America
|
1 | 16.7% |
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