Slewing bearing is also called turntable bearing, it is a large bearing, plays an important role in mechanical equipment, it can withstand the larger axial, radial load and overturning moment at the same time. At present, there are many kinds of slewing bearings on the market, and their uses are also different. So, do you know what are the common types of slewing bearing structures? What are they used for?

The slewing bearing consists of four point contact ball bearings with and without teeth, external and internal teeth, double row angular contact ball bearings, cross cylindrical roller bearings, cross tapered roller bearings and three row cylindrical roller combination bearings. The four-point contact ball bearing has a higher static load capacity; Cross cylindrical roller bearing has high dynamic load capacity; The cross tapered roller bearing can have greater bearing rigidity and higher turning accuracy by preinterference.

1, single volleyball type slewing support

Single-row four-point contact ball type slewing bearing consists of two seat rings, compact structure, light weight, steel ball and circular raceway contact four points, can withstand axial force, radial force and tipping moment. Rotary conveyors, welding operators, small and medium-sized cranes and excavators and other construction machinery can be selected.

2, single row cross roller type slewing bearing

Single-row cross roller type slewing bearing, composed of two seat rings, compact structure, light weight, high manufacturing accuracy, small assembly gap, high installation accuracy requirements, roller is 1:1 cross arrangement, can withstand axial force, tipping moment and large radial force, is widely used in lifting transport, construction machinery and military products.

3, double volleyball slewing bearing

The double volley-ball slewing bearing has three seat rings, the steel ball and the isolation block can be directly discharged into the upper and lower raceway, and the upper and lower two rows of steel balls with different diameters are arranged according to the stress condition. This open assembly is very convenient, the bearing Angle of the upper and lower arc raceway is 90°, and it can withstand a large axial force and tipping moment. When the radial force is greater than 0.1 times the axial force, the raceway must be specially designed. The axial and radial dimensions of the double volleyball slewing bearing are relatively large and the structure is tight. Do not apply to the requirements of medium diameter of tower cranes, truck cranes and other loading and unloading machinery.

4, three row roller type slewing bearing

The three-row roller slewing bearing has three seat rings, and the upper and lower and radial raceways are separate, so that the load of each row of rollers can be exactly determined. It can bear a variety of loads at the same time, is the largest bearing capacity of the four products, the shaft and radial size are larger, the structure is firm, not suitable for heavy machinery requiring larger diameter, such as bucket excavator, wheeled crane, Marine crane, port crane, steel running table and large tonnage truck crane and other machinery.