Do You Know Classification of Slewing Bearings

Rotary bearings, also known as slewing bearings, are an essential component used in a wide range of machinery, including cranes, excavators, wind turbines, and robots. One category of these bearings is the turntable or slewing bearing, which allows rotation of heavy loads on a horizontal or vertical axis. In this article, we'll discuss the classification of slewing bearings and their various types suitable for different machines.

Classification of Slewing Bearings

There are three main types of slewing bearings, namely the ball-type, the roller-type, and the combination type. The ball slewing bearing is the most common type and is capable of handling loads in all directions. The roller slewing bearing has a higher load-carrying capacity with reduced friction and is commonly used in cranes. The combination slewing bearing is a hybrid of the ball and roller types and provides high load capacity combined with higher moment load.

Ball-Type Slewing Bearings

Ball slewing bearings are further subdivided into four categories based on their structure, capacity, and application. These categories are:

1. Single-row four-point contact ball slewing bearing - This type of bearing is used in machines with low-speed and light-duty applications like small cranes, excavators, robots, and aerial work platforms.

2. Single-row cross roller slewing bearing - The single-row cross roller bearing is suitable for high-precision applications like machine tools and robots.

3. Double-row ball slewing bearing - This slewing bearing has two rows of balls and is suitable for machines with heavy loads, such as excavators, cranes, and wind turbines.

4. Three-row roller slewing bearing - The three-row roller slewing bearing is ideal for handling large axial loads and radial loads in extremely harsh environments like heavy-duty cranes and excavators.

Roller-Type Slewing Bearings

Roller slewing bearings are classified into two categories, namely the single-row and double-row types, based on the number of rollers used in the bearing. These categories are:

1. Single-row crossed roller slewing bearing - This bearing has high load-carrying capacity and is widely used in cranes.

2. Double-row spherical roller slewing bearing - This bearing is suitable for cranes and heavy-duty machines that require high load-carrying capacity and low friction.

Combination-Type Slewing Bearings

Combination slewing bearings are classified into three categories, based on the diameter and load-carrying capacity of the bearing. These categories are:

1. Light-duty slewing bearing - This slewing bearing is suitable for small cranes, robots, and aerial work platforms that operate at low speed and low loads.

2. Medium-duty slewing bearing - The medium-duty slewing bearing is ideal for machines with medium loads, such as excavators, cranes, and aerial work platforms.

3. Heavy-duty slewing bearing - The heavy-duty slewing bearing is capable of handling large axial loads and radial loads in extremely harsh environments like heavy-duty cranes, excavators, and wind turbines.

Conclusion

Slewing bearings are an essential component used in a wide range of machinery and are classified based on their structure, capacity, and application. Understanding the different types of slewing bearings and their suitability for different machines is crucial in selecting the right bearing for optimal machine performance.

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