Cross roller bearing and slewing bearing
Rotary table bearings and crossed roller bearings are similar in function and structure, such as high rigidity, high precision, stable rotating torque, and long life. More and more traditional designs are abandoned on high-precision CNC machining equipment such as industrial robot joints, CNC rotary tables, indexing plates, vertical grinders, direct drive motors, precision medical instruments, etc., and high-precision crossed roller bearings with better performance are used.
The rotary table bearing is also called the rotary table bearing or the slewing bearing. It is a bearing type developed by a German company similar to the three-row roller combination slewing structure. Compared with the slewing bearing of the three-row roller combination structure, it has a small size. High precision grade, high rigidity, large load bearing capacity and resistance to damage. Mainly used in high-precision CNC rotary table, CNC indexing plate, vertical machining center, vertical grinding machine, military radar, precision medical equipment.
Cross-roller bearings are also called cross-roller bearings. The rolling elements are generally arranged with a cylindrical roller or a tapered roller on a single raceway. The roller and the roller are separated by a retainer or a spacer. High rotation accuracy, large bearing capacity, small form factor and high rotational speed and rigidity have a wide range of applications. Suitable for industrial robot joints, CNC rotary tables, DD motors, medical equipment and other fields.
Rotary table bearings and crossed roller bearings have the unsurpassed advantages of conventional bearings in every respect.
Advantages of rotary table bearings
1. The accuracy level that can be achieved by the rotary table bearing is much higher than that of the crossed roller bearing. The radial runout and axial runout that can be achieved are much lower than those of the crossed roller bearing.
2. The rigidity of the rotary table bearing is larger than that of the crossed roller bearing, and the running noise is smaller than that of the crossed roller bearing. Therefore, in a low noise working environment, it is much better to select the rotary table bearing.
3. The bearing capacity of the same size rotary table bearing is much higher than that of the crossed roller bearing. The size of the rotary table bearing is much larger than that of the crossed roller bearing, so the rotary table bearing is better in bearing a larger load.
Advantages of crossed roller bearings
1. The cross roller bearing can be easily assembled in all directions of the main shaft. It can be mass-produced through standardization and serialization, and it is convenient to assemble and use.
2. Cross-roller bearings can withstand both radial and axial loads, so cross-roller bearings can be much more simplified than multiple sets of combined bearing structures.
3, cross roller bearing due to high rotation efficiency and low heat dissipation, lubricating grease consumption is small.
4. The radial and axial dimensions of the crossed roller bearings can be limited. Therefore, according to the space, it is possible to use high-precision and high-rigidity situations with small space requirements.
In terms of structure, the turret bearing and the cross-roller bearing structure are much simpler than the conventional bearing. By the arrangement of the cylindrical rolling bodies arranged in multiple rows, considerable axial and radial bearing capacity and overturning moment can be obtained, and the structure is relatively simple. Many, and the traditional bearing must be arranged through multiple sets of bearings in order to achieve the same effect, which brings great convenience in design and assembly and installation. Bearing single-row roller combination slewing bearing structure and cross-roller bearing single-row raceway structure, compared with the traditional bearing, occupying equipment space is much smaller, assembly difficulty is also greatly reduced.
In terms of installation, the rotary table bearing is more convenient to install, the mechanism design is simplified, and the cross-roller bearing also increases the design of the mounting hole. The installation and use effect is also comparable. Therefore, how to use such a rotary table bearing can be based on its own equipment. Reasonable requirements and reasonable cost considerations are the choice of high-quality cross-roller bearings or high-end series; from the maintenance point of view, both types of bearings are designed for lubrication holes and oil grooves, bearing lubrication is convenient, using advanced aviation grease There is no need to change grease frequently, which is a series of guarantees for bearing stability and life; in summary, the cross roller bearing is suitable for precision machining equipment such as glass grinding machine, rotary table, industrial robot joint, precision CNC turntable, Turntable bearings can be used in various fields such as medical equipment, scientific research instruments, and measuring equipment.
