Crossed roller bearings for hollow rotary platforms

- Jan 09, 2020-

Hollow rotating platform reducer is a new type of rotary load device, which has the characteristics of high efficiency, high precision, high rigidity and high price, and combines the advantages of almost all types of reducers. Hollow rotary platform reducer is also called servo hollow rotary platform, high precision motorized rotation stage, hollow rotary platform and motor hollow rotary platform.

The reason why the hollow rotating platform can occupy an irreplaceable role in the reducer family is mainly because it can improve reliability and reduce costs through direct connection. The hollow rotary platform reducer can directly install the workbench and mechanical arm of the required device on the platform, thereby reducing the time and cost of mechanical design, parts deployment, and belt condition adjustment.

The hollow rotary platform reducer can freely adopt various motors with flat shooting, and there is no backlash. The positioning accuracy is less than 1MIN. At the same time, its wiring and piping are more flexible and concise. The characteristics are particularly prominent in the wiring environment! Its structure is hollow, and the servo motor is connected to the side, which is convenient for the installation of air pipes and wires in the fixture. It can have high repeat positioning accuracy, strong high rigidity and high rotation accuracy.


Regardless of whether it is a fourth-axis machining turntable of a CNC machine tool, whether it is used in a manipulator joint, or as a part of a manufacturing unit, the hollow rotary platform directly affects or even determines the accuracy and overall performance of its related products. The fundamental factor that determines the performance of a hollow rotary platform lies in the structure and accuracy of its supporting bearing type. Regardless of the form of the hollow electric rotating platform, its slewing support requires high axial and radial positioning accuracy.

Crossed roller bearings are also called cross roller bearings. Rolling bodies generally use cylindrical rollers or tapered rollers arranged in a cross on a single raceway. The dimensions are small, and the rollers and rollers are separated by cages or isolated. The block interval has higher rotation accuracy, larger bearing capacity, smaller outer size, higher rotation speed and rigidity, and has a wide range of uses.

In terms of structure, the cross roller bearing structure is much simpler than traditional bearings. Through a single row of cylindrical rolling bodies arranged in a row, you can obtain considerable axial and radial bearing capacity and overturning moment. The structure is much simpler. Traditional bearings must be arranged in sequence through multiple sets of bearings to achieve the same effect, which brings great convenience in design, assembly and installation. Compared with traditional bearings, the space occupied by the equipment is much smaller, and the difficulty of assembly is greatly reduced.

From the perspective of installation, the customized cross roller bearing is more convenient to install, the mechanism design is simplified, and the mounting hole design is added. The installation and use are simpler, which greatly simplifies the structure of the rotating platform.

In terms of maintenance, the outer ring of the cross roller bearing is designed with lubricating oil holes and oil grooves, which is easy to lubricate. It adopts lithium-based extreme-pressure grease, which does not require frequent grease changes. It has a series of guarantees for the accuracy, stability and life of the bearing. , It is conducive to delaying the friction and wear of the bearing and thereby extending the service life of the bearing.

In summary, customized cross roller bearings have undoubtedly become the ideal choice for rotary support bearings for hollow rotary platforms.