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Slewing Ring

Slewing bearings are generally composed of an inner ring and an outer ring, and also have a split structure of the inner ring or the outer ring. The inner ring or the outer ring can be machined with teeth at the same time and have mounting holes. 

This makes the connection between adjacent components easier and faster. Through the joint action of the bearing raceway and the rolling element protection frame or isolation block assembly, slewing bearings can bear unidirectional load, bidirectional load, overturning moment, and combined load in any direction. 

According to the form of the rolling element arrangement, slewing bearings can be generally divided into four-point contact ball slewing bearing, crossed roller slewing bearing, three-row roller slewing bearing, and so on. As a slewing bearing supplier, we will devote ourselves to satisfying customers' demands. The followings are the slewing bearing for sale.

Four-point Contact Ball Slewing Ring

Four-point contact ball bearings are radial single row angular contact ball bearings with raceways that are designed to support two-directional axial loading.

Cross Roller Slewing Ring

Cross-roller type slewing bearings, their rollers are arranged at 90° to each other at intervals between the inner ring and the outer ring. They can simultaneously bear loads from all directions (such as axial, radial, overturning moment, etc.). Because the rollers are in line contact with the track surface, the elastic deformation of the bearing under heavy load is correspondingly small and the rigidity is high. At the same time, it has mounting holes and sealing accessories or is equipped with teeth on the inner ring or outer ring to simplify the installation structure.

Three-row Roller Slewing Ring

The three-row cylindrical roller combined slewing bearing is mainly composed of an inner ring, an outer ring, three rows of rollers (two sets of axial and one set of radial rollers), a cage (spacer block), and has the characteristics of high load carrying capacity and good rigidity. At the same time, it has mounting holes and sealing accessories or is equipped with teeth on the inner ring or outer ring to simplify the installation structure.

The Working Principle of Slewing Ring

The working principle of the slewing ring is very simple: the way of moving the object is from sliding to rolling, reducing frictional resistance.

Specifically, the slewing ring mainly relies on lubrication and friction to achieve the effect of operation. Internally, it relies on the mutual friction between the ball and the steel ring to achieve the purpose of operation. Externally, it also relies on the friction between the slewing ring(the own or later added gear) and other components(drive gears, etc.) to start the operation and rub against each other, thereby driving the object to operate. Since it is mostly used to carry heavier large objects, its centripetal force is very high, which is also determined by its working principle, so it also needs a steel material that can ensure quality in terms of materials.

Of course, it is far from enough only with friction. Although it relies on friction to operate, lubrication is also essential. Just like the chain of a bicycle, if it is used for a long time and the friction is too large, it will also affect the use of parts. Therefore, after using this kind of bearing for a period of time, it is necessary to maintain it in time. Brush some lubricating oil or grease (on the external friction surface) and regularly lubricate the inside of the raceway to ensure that it can work well in a more suitable environment.

The Daily Maintenance of Slewing Ring

1. After 100 working hours of operation, the slewing bearing should be maintained once and the pre-tightening torque of the secondary bolts should be checked.

2. If more than 10% of the bolts are loosen, check again after 200 working hours.

3. In the future, check every 500 working hours; in severe working conditions, the inspection interval should be shortened.

4. After the equipment has been working for 2000 hours, if a bolt is found to be loose to less than 80% of the specified torque, the bolt and the two adjacent bolts should be replaced with new ones.

5. If 20% of the bolts are found to be loose to less than 80% of the specified torque, the bolts should be replaced with new ones.

6. After the equipment has been working for 14,000 hours, the bolts must be replaced with new ones.

7. For equipment with high rotation speed or continuous rotation or frequent work, add oil every 100 working hours.

8. In the case of bad working conditions, it is necessary to shorten the time interval for filling lubricating grease.

Slewing Bearing Application

Off-highway equipment
Harbor and deck cranes
Large, Precision, and Index Turntables
Bottling Equipment
Automatic assembly line

Custom Bearings From THB Bearings

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