Do you really understand slew bearings?
Do you really understand slew bearings?
Slewing bearings can be divided into four-point contact ball slewing bearings, double-row reducing ball slewing bearings, crossed cylindrical roller slewing bearings and three-row cylindrical roller combination slewing bearings according to different structural forms; the above types of bearings According to whether it has teeth and the distribution position of the teeth, it is divided into different structures such as toothless type, external tooth type and internal tooth type.
According to different structural characteristics, slew bearings can meet the needs of the working host under various load conditions. Among them, four-point contact ball slew bearings have a high dynamic load capacity, crossed cylindrical roller slew bearings have a high static load capacity, and three-row cylindrical roller combined slew bearings direct the increase in load-bearing capacity to the height direction of the bearing. , various loads are borne by different raceways and roller groups, so under the same stress 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 turntable with high load-bearing capacity bearings.
The structure of the slewing bearing:
Slewing bearings usually consist of four major components: inner ring, outer ring, rolling elements, and isolation blocks. Since the core component adopts slewing bearing, it can bear axial force and radial force at the same time. There are many forms, but the structural composition is basically the same.
Single row four-point contact ball slew bearing:
The single-row four-point contact ball slew bearing is composed of four parts: inner ring, outer ring, steel ball and isolation block. It has a compact structure and light weight. The steel ball and the arc raceway are in four-point contact. It can withstand axial force at the same time. Radial force. Construction machinery such as rotary conveyors, welding operators, small and medium-sized cranes and excavators can all be used.
Double row ball slewing bearing:
The double-row ball slewing bearing has three races. The steel balls and isolation blocks can be directly discharged into the upper and lower raceways. According to the stress conditions, the upper and lower rows of steel balls with different diameters are arranged. This kind of open assembly is very convenient. The load-bearing angle of the upper and lower arc raceways is 90, which can withstand 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 double-row ball slewing bearing with different diameters has relatively large axial and radial dimensions and a tight structure. It is especially suitable for loading and unloading machinery such as tower cranes and truck cranes that require medium or larger diameters.
Single row crossed roller slew bearing:
Single-row crossed roller slew bearings are composed of two seat rings. They have compact structure, light weight, high manufacturing precision, small assembly clearance, and high installation accuracy requirements. The rollers are arranged in a 1:1 cross and can withstand the axial direction at the same time. Force, overturning moment and large radial force, it is widely used in lifting and transportation, engineering machinery and military products.
Three-row roller slew bearing:
Three-row roller slew bearings have three races, with upper, lower and radial raceways separated so that the load of each row of rollers can be accurately determined. It can withstand various loads at the same time and has the largest carrying capacity among the four products. It has large shaft and radial dimensions and a solid structure. It is especially suitable for heavy machinery requiring larger diameters, such as bucket wheel excavators, wheel excavators, etc. Type cranes, marine cranes, port cranes, molten steel transfer tables and large-tonnage truck cranes and other machinery.
Light series slew bearings:
Light slewing bearings have the same structural form as ordinary slewing bearings, are light in weight and flexible in rotation. Widely used in food machinery, filling machinery, environmental protection machinery and other fields.
Contact
Company:Luoyang EFANT Precision Bearing Manufacturing Co. Ltd
Address:No. 9 Jingjin North Rd, Luoxin Development Zone,
Xin'an County, Luoyang City, Henan Province 471003, China
Tel:86-379-80887690
export@efindbearing.com
https://www.efindbearing.com/contact-us
https://www.efindbearing.com/slewing-bearing/011-30-560-external-gear-slewing-bearings.html
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