Structure

ZZ Slewing Bearing

Structure

Slewing bearings are a key component widely used in mechanical engineering, construction engineering and other fields to support rotating structures. The structural types of slewing bearings are mainly divided into two categories: rolling type and sliding type, each with its own characteristics in design and application.

Rolling slewing bearing

Ball slewing bearing:
Ball slewing bearings use balls as rolling elements. The use of balls reduces friction, allowing the bearing to provide relatively low friction when rotating at high speeds. This design usually provides high precision and relatively high load-bearing capacity, so it is widely used in applications that require high-speed rotation and high precision, such as machine tools, robots, etc.
Roller slewing bearing:
Roller slewing bearings are similar to ball bearings, but use rollers as rolling elements. Compared to balls, rollers are larger in size and therefore perform better under heavier loads and harsher conditions. This makes roller bearings commonly used in heavy construction machinery such as large excavators and cranes.
Double volley ball slewing bearing:
The double row ball slewing bearing uses two rows of balls to support it and has a high load-bearing capacity. This structural design is suitable for some occasions that require greater load-bearing capacity, such as large lifting equipment and industrial machinery. The double-volume ball bearing provides high load-bearing while still maintaining relatively good rotational stability.
Crossed roller slewing bearing:
Crossed roller slewing bearings use cross-arranged rollers. This structure provides greater load-bearing capacity and rigidity. It is often used in applications that require high load-bearing, high precision and high rigidity requirements at the same time, such as large cranes, excavators and industrial machine tools.

Sliding slewing bearing:
Sliding slewing rings support rotation by using lubricants or solid lubricating materials instead of rolling elements. The structure of this design is relatively simple as it does not involve complex rolling elements. However, sliding bearings usually have lower load-bearing capacity and are suitable for some low-speed and high-torque applications, such as camera heads.

Structural Selection Considerations
When selecting the structural type of slewing bearing, several factors need to be considered:

Load-bearing capacity: Different types of slewing bearings differ in load-bearing capacity, so choose the appropriate type according to the load requirements of the specific application.
Accuracy requirements: Rolling slewing bearings usually provide high accuracy and are suitable for applications requiring precise position control, while sliding slewing bearings have relatively low accuracy.
Rotation speed: Due to the use of rolling elements, rolling slewing bearings are usually suitable for high-speed rotation situations, while sliding slewing bearings are more suitable for low-speed applications.
Working environment: Different working environments have different requirements for slewing bearings, including temperature, humidity, corrosiveness and other factors. Choosing the appropriate structure type can improve the durability and stability of the slewing bearing.
Cost: The manufacturing and installation costs of different types of slewing bearings are also different, and performance and cost factors need to be considered comprehensively.