Industry news

Classification of slewing bearings and factors to consider when selecting

2022-05-12

Slewing bearing is a large bearing with special structure that can bear large axial load, radial load and overturning moment and other comprehensive loads at the same time, and integrates various functions such as support, rotation, transmission and fixation. There are many classifications of slewing bearings, each of which has different characteristics and different scenarios. You may not be very clear on the type of selection. Generally, you need to consider: slewing accuracy, running speed, working temperature, Bearing capacity, sealing conditions, vibration, etc., let Yantai Zhiyuan factory introduce to you.

 

slewing bearings

 

a. Classification of slewing ring bearings

 

1. Three-row combined roller slewing bearing

 

The three row roller slewing bearing has the upper and lower and radial raceways of the three races separated, so that the load of each row of rollers can be accurately determined. It can bear various loads at the same time, has a firm structure, and has large shaft and radial dimensions. It is suitable for heavy machinery requiring large diameters.

 

2. Double row angular contact ball slewing bearing

 

The double row ball slewing bearing has three races, and the steel balls and spacer blocks can be directly discharged into the upper and lower raceways. According to the stress conditions, two rows of steel balls with different diameters are arranged. The axial and radial dimensions of the double-row ball slewing bearing are relatively large, and the structure is firm, especially suitable for machinery that requires a medium or larger diameter.

 

3.Single row crossed roller slewing ring bearing

 

The single row cross roller slewing bearing is composed of two races, with compact structure, high manufacturing precision, light weight, small assembly clearance, and can bear axial force, large radial force and tipping moment at the same time.

 

4.Single row four point contact ball slewing ring bearing

 

The single row four-point contact ball bearing slewing bearing is composed of two races, with compact structure and light weight. The steel ball is in contact with the arc raceway at four points, and can bear axial force, radial force and tipping moment at the same time.

 

slewing bearings

 

b. Factors to consider when choosing the type of slewing ring bearing

 

1. Rotation accuracy

 

If the requirements for the bearing positioning ability are high, the crossed roller slewing bearing can be selected.

 

2. Running speed

 

The four-point contact ball slewing ring bearing has a high limit speed, and the friction force generated is smaller than that of the cylindrical roller slewing ring.

 

3. Working temperature

 

In general, the working temperature of the slewing ring bearing mainly depends on the sealing material, grease, and isolation block, and the working temperature range is -25 to +70 °C.

 

4. Carrying capacity

 

The bearing capacity is one of the factors that determines the size of the bearing. In general, the four-point contact ball slewing bearing can withstand heavier radial loads, so it may be more suitable for the occasions where the heavier load and the size and direction of the load may change The four-point contact is a slewing bearing.

 

5. Sealing conditions

 

The qualified seal used in the slewing bearing can provide good protection against moisture and pollution, and it is necessary to ensure that the quality of the bearing is sufficient, which can prolong the service life of the bearing, so the seal is very important for the performance of the slewing bearing.

 

6. Vibration

 

For vibration applications, both four-point contact ball slewing rings and crossed cylindrical roller slewing rings are suitable.

 

The above is the "classification of slewing bearings and factors to consider when selecting", Yantai Zhiyuan factory is a dedicated manufacturer of slewing bearings, integrating design, manufacturing, and research and development. The company has strong technical force, strong production capacity, and complete testing equipment. , If you have other questions about the slewing bearing, you can leave us a message.