Crossed Roller Bearings consist of an outer ring, an inner ring, and a plurality of rollers and spacers. The roller lies between the inner and outer ring with the spacers placed between the rollers to prevent the mutual friction between them thereby decreasing the torque resistance for rotation. There are six types of Crossed Roller Bearings comprising of, the split outer ring type (CRBA), the split inner ring type (CRBB), the high rigidity type (CRBC), the split outer ring with mounting holes (CRBD), the high rigidity with mounting holes (CRBE) and the customized type (CRBX).
There are two main types of crossed roller bearings, one is crossed cylindrical roller bearings, and the other is crossed tapered roller bearings, both of which have rolling elements perpendicular to each other on the V-groove, the only difference is the crossed cone The V-shaped groove of the roller ring is different according to the angle of the tapered roller, so that the bearing capacity is greater and the speed is higher.
Crossed roller bearing is a special type bearing with split inner ring and rotating outer ring. Since the divided inner ring or outer ring is installed with rollers and spacers, it is fixed with the cross roller ring to prevent separation from each other, so it is easy to operate when installing the cross roller ring. Since the rollers are arranged in a cross, only one set of cross roller rings can bear loads in all directions. Compared with the conventional model, the rigidity is increased by 3 to 4 times. At the same time, because the inner ring or outer ring of the cross roller bearing has a two-part structure, the bearing gap can be adjusted, and even if preload is applied, high-precision rotational movement can be obtained. Moreover, due to its special structure, it is usually used as a joint bearing in industrial robots.
Their rollers are arranged at right angles to each other at intervals between the inner and outer wheels. They can bear loads from all directions at the same time (such as axial, thrust or momentum loads, etc.). Because the rollers are in linear contact with the track surface, the possibility of elastic deformation of the bearing under load is very small. This type of bearing is widely used in industrial robots, working machinery and medical facilities, etc., where high rigidity, compactness and high speed are required to ensure accuracy.
When you purchase the crossed roller bearings, please confirm the designation first.
Features of Crossed Roller Bearings
1. Excellent rotation accuracy
The internal structure of the crossed roller bearing adopts the rollers arranged in a 90° mutually perpendicular crosswise arrangement.
Spacers or spacers are installed between the rollers to prevent the rollers from observing each other when they are tilted. In addition, there is no contact phenomenon or locking phenomenon on one side of the roller; at the same time, because the inner and outer rings are divided structures, the gap can be adjusted, and even if preload is applied, high-precision rotational movement can be obtained.
2. Simplified operation and installation
The outer ring or inner ring, which is divided into two parts, is fixed together after the rollers and cages are installed, so the installation is very simple.
3. Withstand large axial and radial loads
Because the rollers are arranged perpendicular to each other through spacers on the 90° V-groove rolling surface.
4. Significantly save installation space
The size of the inner and outer rings of the cross roller bearing is miniaturized to a minimum, especially the ultra-thin structure is close to the limit of small size, and has high rigidity, so it is most suitable for the joints or rotating parts of industrial robots, and the rotation of machining centers. Workbenches, manipulator rotating parts, precision rotating workbenches, medical instruments, measuring instruments, IC manufacturing equipment, etc. are widely used.
5. High speed capability
6. Reduce shaft length and processing costs, thermal expansion causes limited changes in geometric dimensions
7. Adopt nylon divider, low moment of inertia, low starting torque, easy to control angle indexing
8. Optimize the pre-tightening force, the rigidity is large, and the guiding roller has high precision
9. Carburized steel provides excellent impact resistance and surface abrasion resistance
10. Simple but well lubricated
EASIER designs and manufactures a variety of crossed roller bearings that can handle radial, thrust and moment loads at the same time. These compact bearings feature rollers crossed at right angles between inner and outer rings.
-- Widely used in machine tools, industrial robots and medical equipment because of their high rotational accuracy.
-- Roller guide options include a cage or separator as well as a full complement design. Both the cage and separator styles offer a small coefficient of friction for high-speed rotation. Full complement bearings handle heavy loads at low speeds.
-- Sealed and open designs are available. Sealed bearings incorporate synthetic rubber seals to protect against dust, dirt and grease.
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