What is the basic mechanism of a slewing bearing?

2020-03-27

Slewing bearings are usually composed of four major components: inner ring, outer ring, roll body, and barrier block. Because the core component adopts slewing bearing, it can bear axial force and radial force together. There are many forms, but the structure and composition are fundamentally different.

From left to right are (upper part): 1. Outer ring (with or without teeth) 2. Seal belt 3. Rolling body (ball or roller) 4. Fuel nozzle

From left to right are (lower part): 1. plug 2. taper pin 3. inner ring (with or without teeth) 4. blocking block or cage 5. device hole (wire hole or smooth hole)

The slewing bearing is a medium-to-large bearing with a special structure that can simultaneously accept large axial loads, radial loads and overturning moments.

Under normal circumstances, the slewing bearing itself has device holes, smooth oil holes and sealing devices, which can meet the different needs of various hosts operating under various working conditions; on the other hand, the slewing bearing itself has a compact structure and guide rotation Convenience, simple installation and easy maintenance, etc., are widely used in medium and large reversing devices such as lifting and conveying machinery, metallurgical machinery, mining machinery, construction machinery, port machinery and automated assembly lines.

PRS slewing bearings can be divided into four-point contact ball slewing bearings, double-row different diameter ball slewing bearings, interspersed cylindrical roller slewing bearings and three-row cylindrical roller combined slewing bearings according to different structural forms. Bearings are divided into different structures such as non-tooth type, external tooth type and internal tooth type according to whether they are toothed or not, and where the teeth are scattered.

According to different structural features, the slewing bearing can meet the needs of the host under various load conditions.

In the meantime, the four-point contact ball slewing bearing has a higher dynamic load capacity, and the interspersed cylindrical roller slewing bearing has a higher static load capacity. The three-row cylindrical roller combined slewing bearing leads the improvement of the bearing capacity to the height direction of the bearing. , Various loads are respectively received by different raceways and roller groups, so under the same force conditions, the diameter of the bearing can be greatly reduced, so it has the characteristics of making the host more compact, and it is a high-loading capacity turntable Bearing.