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Industrial robot bearing classification and industry development analysis.

Update:10-05-2020
Summary:

As one of the key supporting parts of industrial robots […]

As one of the key supporting parts of industrial robots, industrial robot bearings are most suitable for joint parts or rotating parts of industrial robots, rotating worktables of machining centers, manipulator rotating parts, precision rotating worktables, medical instruments, measuring instruments, IC manufacturing Widely used in devices. It mainly includes two types of bearings used in industrial robots, one is a thin-walled bearing of equal section such as miniature deep groove ball bearing, and the other is a cross cylindrical roller bearing. In addition, there are harmonic reducer bearings, linear bearings, joint bearings, etc., but mainly the first two bearings.

Features of industrial robot bearings: 1. Can withstand comprehensive loads in axial, radial, and overturning directions; 2. Thin-walled bearings; 3. High rotational positioning accuracy. Any bearing that meets this design requirement can be used for industrial robot arms, slewing joints, chassis and other parts.

Industrial robot bearing classification:

1. Crossed roller bearings

The characteristics of crossed roller bearings: Crossed roller bearings are cylindrical rollers or tapered rollers that are arranged perpendicular to each other by spacers on the 90-degree V-groove rolling surface, so the crossed roller bearings can bear radial Multi-directional loads such as load, axial load and moment load. The size of the inner and outer ring is miniaturized, the ultra-thin form is closer to the limit of the small size, and has high rigidity, and the accuracy can reach P5, P4, P2 level. Therefore, it is suitable for the joints and rotary parts of industrial robots, rotary tables of machining centers, precision rotary tables, medical machines, calculators, military industry, IC manufacturing equipment and other equipment.

1. Excellent rotation accuracy:

The internal structure of the crossed roller bearing adopts the rollers to be perpendicularly arranged at 90 ° to each other, and the rollers are equipped with spacers or spacers to prevent the rollers from leaning and the rollers to grind each other, effectively preventing the rotating torque Increase. In addition, there will be no contact or locking phenomenon of the roller; at the same time, because the inner and outer rings are divided structures, the gap can be adjusted, even if preload is applied, high-precision rotational movement can also be obtained.

2. Simplified operation and installation:

The outer ring or inner ring, which is divided into two parts, is fixed together after the roller and the cage are installed, so the operation is very simple during installation.

3. Withstand large axial and radial loads:

Because the rollers are arranged perpendicular to each other on the V-groove rolling surface with a 90 ° interval spacer, this design allows the crossed roller bearings to withstand all radial loads, axial loads and moment loads. Directional load.

4. Significantly save installation space:

The size of the inner and outer rings of the crossed roller bearing is minimized, especially the ultra-thin structure is a small size close to the limit, and has high rigidity, so it is most suitable for the rotation of the joint part or rotating part of the industrial robot, and the machining center It is widely used in worktables, manipulator rotating parts, precision rotating worktables, medical instruments, measuring instruments, and IC manufacturing equipment.

Crossed roller bearing type:

Crossed roller bearing type RB

RB type (outer ring split type, inner ring rotation)

This series of models is the basic type of crossed cylindrical roller bearings. The size of the inner and outer rings is minimized. Its structure is that the outer ring is divided and the inner ring is a one-piece design. .

RE type (inner ring split type, outer ring rotation)

This series of models is a new type produced by the design concept of the RB type, and the main dimensions are the same as the RB type. Its structure is that the inner ring is a split type, and the outer ring is a one-piece design, suitable for parts requiring high rotation accuracy of the outer ring.

Since this series of models have been processed with mounting holes, there is no need for fixing flanges and supporting seats. In addition, due to the integrated inner and outer ring structure with a seat, the installation has almost no effect on performance, so stable rotation accuracy and torque can be obtained.

Can be used for outer ring and inner ring rotation.

CRB type (outer ring split type, inner ring rotation)

Its structure is that the outer ring is a split type, and the inner ring is a one-piece design, without a cage full of roller bearings. Suitable for parts requiring high rotation accuracy of the inner ring.

CRBC type (outer ring split type, inner ring rotation)

Its structure is that the outer ring is a split type, the inner ring is a one-piece design, with a cage full of roller bearings. Suitable for parts requiring high rotation accuracy of the inner ring.

CRBH type (integrated inner and outer ring)

The inner and outer rings of this series of models are of integrated structure and are used for the rotation of the outer and inner rings.

RA type (outer ring split type, inner ring rotation)

This series of models is a compact type that reduces the thickness of RB type inner and outer rings to the limit. Suitable for parts that require light weight and compact design, such as industrial robots and manipulator rotation parts.

RA-C type (single crack type)

The main dimensions are the same as the RA type. Because this model has a notched structure for the outer ring, the outer ring also has high rigidity, so it can also be used for outer ring rotation.

XR / JXR type (cross tapered roller bearing)

This type of bearing has two sets of raceways and rollers, which are combined at right angles to each other, and the rollers are staggered and opposed. The height of the cross-section of the bearing is similar to that of a single-row bearing, so it saves space and housing material. The large cone angle and cone geometry design make the overall effective span of the bearing several times the width of the bearing itself. Crossed tapered rollers can withstand high overturning moments and are suitable for machine tools, including vertical boring and grinding machine tables, machine tool precision circular indexing tables, large hobbing machines, turrets, industrial robots, etc.

Second, equal section thin-walled bearings

The equal-section thin-walled bearing is composed of seven open series and five sealed series. There are three types of open series: radial contact type C, angular contact type A and four-point contact type X. The advantages of thin-walled and other cross-section bearings: the thin-walled bearing realizes an extremely thin bearing cross-section, and also realizes the miniaturization and weight reduction of the product. The variety of products expands its range of uses.

Features of thin-walled and other cross-section bearings: In order to obtain low friction torque, high rigidity and good rotation accuracy of bearings, steel balls with small outer diameters are used. The use of hollow shafts ensures space for light weight and wiring. The thin-walled 6700 and 6800 series have a variety of dust cover forms, flanged forms, stainless steel forms, and wide-width forms.

The main uses of thin-walled and other cross-section bearings: stepper motors, medical equipment, office equipment, testing equipment, deceleration. Variable speed devices, robots, optics. Imaging equipment, rotary encoders.

Thin-walled and other cross-section bearings are also called thin-walled ring bearings, which have high precision, very quietness and strong bearing capacity. Thin-walled ring bearings can be deep groove ball bearings, four-point contact bearings, angular contact ball bearings, thin-walled and other cross-section bearings are mostly square in cross-section. In these series, even with larger shaft diameters and bearing holes, the cross-section remains unchanged. These bearings are therefore called equal sections. It is this characteristic that distinguishes the thin-walled ring bearings in the standard ISO series from traditional bearings. Therefore, it is possible to choose a larger cross-section and use a bearing with a higher load carrying capacity without having to change the shaft diameter. Thin-walled ring bearings can be designed as extremely light bearings that require very little space.

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