Crossed roller bearing
The crossed roller bearing is a special type of bearing with inner ring splitting and outer ring rotation. Since the divided inner ring or outer ring is fixed to the cross roller collar after being loaded into the roller and the spacer, to prevent separation from each other, the operation is simple when the cross roller collar is installed. Since the rollers are arranged in a cross arrangement, only one set of crossed roller collars can withstand loads in all directions, and the rigidity is increased by 3 to 4 times compared with the conventional model. At the same time, since the inner ring or the outer ring of the crossed roller bearing has a two-divided structure, the bearing clearance can be adjusted, and even if a preload is applied, a high-precision rotational motion can be obtained. Moreover, due to its special structure, it is commonly used as a joint bearing in industrial robots.
Introduction
Their rollers are arranged at right angles to each other at intervals between the inner and outer wheels. They can withstand loads from all directions (such as axial, thrust or momentum loads). Since the roller is in linear contact with the surface of the track, the bearing is less likely to be elastically deformed by the load. This type of bearing is widely used in industrial robots, work machines and medical facilities, where high rigidity, tightness and high speed are required to ensure accuracy.
In the cross-roller bearing, since the cylindrical rollers are vertically aligned with each other by the spacer, one cross roller bearing can withstand loads in all directions such as radial load, axial load, and moment load. The size of the inner and outer rings is minimized, and the extremely thin type is a small size close to the limit and has high rigidity, so it is most suitable for the joint portion or the rotating portion of the industrial robot, the rotary table of the machining center, Uses such as robot rotating parts, precision rotary tables, medical equipment, gauges, IC manufacturing equipment, etc.
Use characteristics
Cross-roller bearings, because of the divided inner or outer ring, are attached to the roller and spacer after the roller and spacer are installed to prevent separation from each other, so when installing the cross roller collar simple. Since the rollers are arranged in a cross arrangement, only one set of crossed roller collars can withstand loads in all directions, and the rigidity is increased by 3 to 4 times compared with the conventional model. At the same time, since the inner ring or the outer ring of the crossed roller bearing has a two-divided structure, the bearing clearance can be adjusted, and even if a preload is applied, a high-precision rotational motion can be obtained.
1, with excellent rotation accuracy
The internal structure of the crossed roller bearing is arranged at 90° perpendicular to each other by rollers, and spacers or spacers are arranged between the rollers to prevent the rollers from being tilted between the rollers. In addition, the contact phenomenon or the locking phenomenon of the roller does not occur; at the same time, since the inner and outer rings are divided structures, the gap can be adjusted, and even if the preload is applied, a high-precision rotary motion can be obtained.
2, the operation is simplified
The outer ring or inner ring that is divided into two parts is fixed together after the roller and the retainer are loaded, so the operation is very simple to install.
3. Withstand large axial and radial loads
Since the rollers are vertically aligned with each other by the spacers on the V-shaped groove rolling surface of 90°.
4, greatly save installation space
The size of the inner and outer rings of the crossed roller bearing is miniaturized to a minimum. In particular, 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 portion or the rotating portion of the industrial robot and the machining center. A wide range of applications such as work tables, robot rotating parts, precision rotary tables, medical instruments, measuring instruments, and IC manufacturing equipment.
5. High speed capability
6. Reduce shaft length and machining cost, thermal expansion leads to limited variation in geometry
7. Nylon separator, low moment of inertia, low starting torque, easy to control angular division
8. Optimize the pre-tightening force, the rigidity is high, and the guiding roller has high running precision.
9. Carburized steel provides excellent impact resistance and surface abrasion resistance
10. Simple but fully lubricated
Classification and model series of domestic cross cylindrical roller bearings
RB type (outer ring split type)
The RB series model is a basic type of crossed cylindrical roller bearings. The inner and outer ring sizes are miniaturized to a minimum. The outer ring is a split type, and the inner ring is an integral design. It is suitable for parts requiring high inner ring rotation accuracy. .
RE type (inner circle split type)
The RE series model is a new type produced by the XRB type design concept, and its main dimensions are the same as those of the XRB type. The structure is that the inner ring is a split type, and the outer ring is an integral design, which is suitable for a portion requiring high rotation precision of the outer ring.
RU type (inner and outer ring integrated type)
The RU series models do not require a fixing flange and a support base because they have been machined. In addition, since the integrated inner and outer ring structure with the seat is used, the mounting has almost no effect on the performance, so that stable rotation accuracy and torque can be obtained. Can be used for outer ring and inner ring rotation.
RBC type (outer ring split type)
The RBC series model (corresponding to the IKO CRBC series) is constructed with an outer ring that is split and the inner ring is an integral design with a cage full complement roller bearing. It is suitable for parts requiring high rotation accuracy of the inner ring.
CRBH type (integral type of inner and outer rings)
The inner and outer rings of the CRBH series are all unitary for rotation of the outer and inner rings.
RA type (outer ring division, ultra-thin type)
The RA series is a compact version that reduces the thickness of the inner and outer rings of the RB type to the limit. Suitable for parts that require a lightweight, compact design, such as robots and robotic rotating parts.
SX type (outer ring split type)
The SX series model structure is similar to the RB series. The outer ring is a two-part structure. It is connected by three spring snap rings. The inner ring is designed in one piece and is suitable for places where the inner ring rotation precision is required.
XRU08 type (inner and outer ring integrated type)
The XSU08 series is similar to the RU series. The inner and outer rings have been machined for mounting holes, eliminating the need for a fixed flange and support. Thanks to the integrated inner and outer ring structure with the seat, the installation has almost no effect on the performance, so stable rotation accuracy and torque can be obtained. Can be used for outer ring and inner ring rotation.
First thrust angular contact ball bearing
Thrust angular contact ball bearing contact angle is generally 60°. Commonly used thrust angular contact ball bearings are generally two-way thrust angular contact ball bearings. They are mainly used for precision machine tool spindles. They are generally used together with double row cylindrical roller bearings to withstand bidirectional shafts. The load has the advantages of high precision, good rigidity, low temperature rise, high speed, convenient assembly and disassembly.
Second deep groove ball bearing
Each ferrule of the structure deep groove ball bearing has a continuous grooved raceway having a cross-section of approximately one-third of the circumference of the equator of the ball. Deep groove ball bearings are mainly used to withstand radial loads and also withstand certain axial loads. When the radial clearance of the rolling bearing is increased, it has the property of an angular contact ball bearing and can withstand the axial load alternating in two directions. Compared with other types of bearings of the same size, this type of bearing has a small friction coefficient, high speed limit and high precision, which is the preferred bearing type for users. The deep groove ball bearing has a simple structure and is easy to use, and is a type of bearing with the largest production batch and the widest application range.
Third thrust tapered roller bearing
Since the rolling elements in the thrust tapered roller bearing are tapered rollers, the rolling busbars of the rolling busbars and the washers on the structure are all at a certain point on the axial center of the bearing, so that the rolling surface can form pure rolling and the maximum speed is high. For thrust cylindrical roller bearings. Features: Thrust tapered roller bearings can withstand one-way axial loads. Types of thrust tapered roller bearings are model number 90000.
Introduction to crossed cylindrical roller bearings
Crossed roller bearings are composed of two major types, one is a crossed cylindrical roller bearing and the other is a crossed tapered roller bearing; the crossed roller bearing has a long history of application abroad, but it is only recently in China. It has only entered the public's horizon for a few years, and is widely used because of its particularity and superiority with other bearings.
main feature :
1. Excellent rotation precision. The internal structure of the crossed roller bearing adopts rollers 90° perpendicular to each other (this is also the name of the crossed roller bearing). The roller is equipped with spacers or spacers. Preventing the roller rollers from tilting each other, effectively preventing the increase of the rotational torque. This cross cylindrical roller bearing has been included in the fast and easy to use, in addition, there will be no contact or locking phenomenon of the roller; at the same time, because the inner and outer rings of the standard cross roller bearing are divided structures, the clearance can be adjusted even if By applying pressure, high-precision rotary motion can also be obtained.
2. Operation and installation The simplified standard cross-roller bearing is divided into two parts of the outer ring or the inner ring. After the roller and the retainer are installed, they are fixed together. The mounting bolts and the fixing flange can be finely adjusted during installation. The ideal load condition is achieved, so the installation is very simple.
3. Affecting large axial and radial loads. Because the rollers are vertically aligned with each other through the spacers on the 90° V-groove rolling surface, this design allows the crossed roller bearings to withstand large Loads in all directions, such as radial load, axial load and moment load.
4. Significant savings in installation space The size of the inner and outer rings of the cross roller bearing is minimized. In particular, the ultra-thin structure is a small size close to the limit and has high rigidity, so it is most suitable for joints or rotating parts of industrial robots. The rotary table, the robot rotating part, the precision rotary table, the medical instrument, the measuring instrument, and the IC manufacturing device of the machining center are widely used.
Introduction to Cross Tapered Roller Bearings
The XR series of cross-tapered roller bearings are designed to provide high rotational accuracy and stiffness in a small space, resulting in significant material cost savings. This type of bearing is to install two sets of bearing races and rollers at right angles. The adjacent rollers are facing in opposite directions. The spacers are installed between the rollers and the rollers. The rollers are also equipped with support spacers. This allows the two halves of the roller to fit into the same space. The angle and tapered geometry of the bearing allows the effective span of the bearing to be several times larger than the actual width of the bearing itself.
XR series bearings are suitable for high speed machine tools such as vertical boring machines and vertical grinding machines. It is also especially suitable for many devices with limited space and high rotation accuracy.
Size range
2463.800 mm (4.000 in. to 97.000 in.)
2819.400 mm (11.000 in. to 111.000 in.)
Design characteristics
The XR series has two rows of tapered rollers that are vertically aligned by a spacer on a V-shaped hob surface of 90°, and can withstand loads in all directions such as radial load and axial load. Line contact on the raceway and roller construction provides maximum rotational accuracy, high stability and greater tilt stiffness. The preloaded adjustable design extends bearing life, maximizing stiffness and providing minimum runout. The nylon spacer has a low inertia and a small running torque. The parts are made of surface carburized steel or electroslag remelted bearing steel with good impact resistance.
