Comparison of performance characteristics of crossed roller bearings and crossed roller slewing bearings
Crossed cylindrical roller bearings and crossed roller slewing bearings (crossed cylindrical roller slewing bearings) are very similar in structure and function. For example, in terms of accuracy, they have high rigidity, high stable rotational torque, and long life. On CNC machine tool turntables and indexing plates, CNC vertical grinders, machine tool direct drive motors and other mechanical equipment, on the shoulder, waist, wrist, elbow, finger joints and other parts of industrial robots, as well as high-precision medical equipment, Optical equipment and other high-precision numerical control processing equipment are increasingly abandoning traditional designs, and then adopting better performance precision cross-roller bearings.
Cross-roller slewing bearings are also popularly called cross-roller slewing bearings or cross-roller slewing bearings in China. Compared with the slewing bearings of three-row roller combined structure, they have small size, high precision grade, high rigidity, large load and damage resistance, etc. Features. Cross-roller slewing bearings are often used in large slewing devices such as bucket turbines, overweight transport machinery, port machinery, mining machinery, park amusement machines, filling machines, construction machinery and missile launchers, and are useful for construction machinery products. Very important help. Precision crossed cylindrical roller bearings have a series of advantages such as high rotation accuracy, strong resistance to deformation, large carrying capacity and flexible structure design. They are widely used in the joints and rotating parts of industrial robots, CNC rotary tables, precision test turntables, In precision equipment such as optical telescopes and large radar antennas. The slewing bearing plays a vital role as a core component in precision slewing equipment. The main factors affecting the slewing accuracy of the bearing are bearing manufacturing accuracy and bearing rigidity.
The rolling elements of crossed roller bearings are generally cylindrical or tapered rollers arranged in a crisscross arrangement in a single raceway groove, and the rollers are separated by brass cages or engineering plastic spacers, so as to have a higher rotation. Accuracy, larger bearing capacity, smaller dimensions, higher rotation speed and rigidity, and has a wide range of uses. Crossed roller bearings are suitable for industrial robot joints, CNC turntables, DD motors, medical equipment and other fields.
Advantages of crossed roller bearings
1. Crossed roller bearings can be easily assembled in all directions of the spindle, mass production can be realized through standardization and serialization, and assembly and use are more convenient.
2. Crossed roller bearings can bear radial and axial loads at the same time, so the structure of crossed roller bearings can be much simplified than multiple sets of combined bearings.
3. Because of the high rotation efficiency and low heat dissipation of the cross roller bearing, the consumption of lubricating grease is small.
4. The radial and axial dimensions of the crossed roller bearing can be limited, so the space can be saved according to the space requirement, and the space requirement can be used for high precision and high rigidity occasions.
Crossed roller slewing bearings and crossed roller bearings have advantages that traditional bearings cannot surpass in all aspects. The following are the characteristics of crossed roller slewing bearings:
Luoyang Baina Crossed Roller Slewing Bearing Internal Structure Diagram
Composed of two seat rings, compact structure, light weight, high manufacturing accuracy, small assembly clearance, high requirements for installation accuracy, the rollers are arranged in a 1:1 cross, can bear the axial force overturning moment and larger radial direction at the same time force. Because the rollers are arranged perpendicular to each other on the 90° V-groove rolling surface through spacers, this design enables the cross-roller slewing bearing to withstand large radial loads, axial loads, moment loads, etc. Load in all directions.
The main features of crossed roller slewing bearings:
First of all, the structure of the cross-roller slewing bearing is much simpler. Through a row of cylindrical rolling elements arranged in a single raceway, a considerable axial and radial bearing capacity and overturning moment can be obtained. In addition, the crossed roller slewing bearing will not have contact or locking on one side of the rollers. At the same time, because the inner and outer rings of the standard crossed roller slewing bearing are divided, the gap can be adjusted, even if pre-pressure is applied, it can be obtained. High-precision rotational movement.
The advantages of crossed roller slewing bearings over ordinary slewing bearings:
1. The accuracy level that can be achieved by crossed roller slewing bearings is much higher than that of ordinary slewing bearings, and the radial and axial runouts that can be achieved are much higher than those of ordinary slewing bearings.
2. Crossed roller slewing bearings are much more rigid than ordinary slewing bearings, and the running noise is lower than that of crossed roller bearings. Therefore, it is better to choose crossed roller slewing bearings in a low-noise working environment.
3. In terms of structure, compared with ordinary slewing bearings, crossed roller slewing bearings have a much simpler structure. A row of cylindrical rolling elements that cross each other on a single raceway can obtain a fairly large bearing. In order to achieve the same effect, ordinary slewing bearings must be arranged in sequence on three rows of raceways through three rows of cylindrical rolling elements. In this way, the crossed roller slewing bearing occupies much less space than the ordinary three-row roller slewing bearing, and the weight is lighter.
In terms of structure, the structure of crossed roller slewing bearings and crossed roller bearings is much simpler than that of traditional bearings. With multiple rows of cylindrical rolling elements, considerable axial and radial bearing capacity and overturning moment can be obtained. It is much simpler, but traditional bearings must be arranged in sequence through multiple sets of bearings to achieve the same effect, which brings great convenience in terms of design, assembly and installation. Compared with traditional bearings, the cross-roller slewing bearing structure and the single-row raceway structure of the cross-roller bearing occupy much smaller equipment space and greatly reduce the assembly difficulty.
Luoyang Yujie Industry &Trade Co.Ltd located in Luoyang City, one of the main heavy industrial bases in China.
We specialize in the production of bearings, nonstandard machinery parts, machine tools. For the bearings, we can offer cross roller bearing, slewing bearing, YRT bearing, thin section bearing, ball screw bearing, deep groove ball bearing, etc. For the nonstandard machine parts, we can produce gears, shafts, sprockets, molds, rollers, pulley, mining machine parts, etc as per customer drawing and requirements. For the machine tools, we offer CNC vertical machine center, CNC horizontal lathe, CNC gantry boring and milling machine, CNC floor type boring, and milling machine.
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Luoyang Yujie Industry & Trade Co., Ltd.
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ADD: Jianxi Industrial Park, Luoyang City, Henan, China
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