Detailed Guide to different kinds of Slewing bearings

What are slewing bearings?

Slewing bearings, also known as turntable or rotary bearings, are large-sized bearings designed to accommodate axial, radial, and moment loads simultaneously. They facilitate smooth rotation in heavy machinery and equipment across various industries. Slewing bearings can be classified based on their design, rolling elements, raceway configuration, and gear configurations.

Specific classification of slewing bearings

Understanding various types of slewing bearings and their features is crucial for selecting the most suitable bearing for specific applications and load requirements. This ensures smooth operation, improved efficiency, and a longer service life of the machinery and equipment in which the bearing is used.

1. Based on Design:

Single-row Ball Slewing Bearings:Consist of a single row of balls between the inner and outer rings, suitable for handling moderate axial and radial loads along with low to moderate overturning moments. They are commonly used in cranes, excavators, and aerial work platforms.

Double-row Ball Slewing Bearings:Comprise two separate rows of balls between the inner and outer rings, offering higher load capacities compared to single-row bearings. They are utilized in heavy-duty applications that require increased load-carrying capacity.

2. Based on Rolling Elements:

Ball Slewing Bearings:Utilize spherical balls as rolling elements, which allow for smooth rotation, reduced friction, and high responsiveness. Ball slewing bearings can handle higher speeds than roller slewing bearings and are more suitable for applications wherein rigidity and precision rotation are essential, like crane booms and radar systems.

Roller Slewing Bearings:Employ cylindrical rollers as rolling elements, which distribute loads more evenly and provide higher load capacities in comparison to ball bearings. They are more suitable for heavy-duty applications with slow to moderate operational speeds, like offshore cranes and heavy machinery.

3. Based on Raceway Configuration:

Single-row Four-point Contact Ball Bearings:These bearings have a raceway configuration that lets a single row of balls handle axial, radial, and moment loads, with four-point contact between the balls and rings. They deliver compactness and enhanced load capacity in various applications, such as cranes, excavators, and wind turbines.

Crossed Roller Bearings:In this configuration, cylindrical rollers are arranged in a crossed orientation, providing high stiffness, accuracy, and load capacity. These bearings enable smooth movement and resistance against deflection under heavy loads, making them suitable for machine tools, manipulators, and robotic arms.

4. Based on Gear Configurations:

Non-geared Slewing Bearings:These bearings lack gear teeth on the inner or outer ring and are suitable for applications where no external gearing is required.

Externally Geared Slewing Bearings:Feature gear teeth on the outer ring, providing power transmission to the rotating assembly. These bearings are commonly employed in applications like cranes, wind turbines, and industrial turntables.

Internally Geared Slewing Bearings:Have gear teeth on the inner ring, allowing for power transmission while maintaining a compact profile. They are used in applications where space constraints exist, like robotic arms and medical equipment.

Specific application field classification of slewing bearings

Slewing bearings are essential components in many types of heavy machinery and equipment across a variety of industries. Their ability to handle axial, radial, and moment loads, facilitate smooth rotation, and effectively manage weight and torque make them vital for numerous applications. Here’s a detailed guide to specific uses of slewing bearings in different fields:

1. Renewable Energy:

Solar Tracking Systems:Slewing bearings are used in single-axis and dual-axis solar trackers, which adjust the angle of solar panels throughout the day to maximize sunlight exposure and energy generation.

Wind Turbines:In wind energy applications, slewing bearings are used to rotate the nacelle and rotor blades according to wind direction, optimizing power generation. They are also utilized in wind turbine blade- and tower-manufacturing equipment.

2. Construction and Heavy Equipment:

Mobile Cranes:Slewing bearings are an integral part of crane booms, enabling heavy load lifting and smooth rotation, allowing operators to move and position loads with precision and safety.

Excavators:They facilitate the rotation and positioning of excavator arms, providing smooth movement and stability during digging and material handling operations.

Aerial Lifts and Work Platforms:In aerial work platforms or man-lifts, slewing bearings allow for precise positioning and rotation at elevated locations, ensuring stability and safety for workers.

3. Industrial Machinery and Automation:

Industrial Turntables:Slewing bearings play a critical role in industrial turntables and rotary tables used for material handling, assembly, painting, and welding processes.

Robotic Arms:In manufacturing and automation, slewing bearings provide precise, controlled movements required to position robotic arms and manipulators accurately.

4. Aerospace and Defense:

Radar and Satellite Systems:They facilitate smooth and controlled rotation of radar dishes and satellite antennas, ensuring accurate targeting, data collection, and communication.

5. Medical and Healthcare Equipment:

Medical Imaging Equipment:Slewing bearings are used in medical imaging devices, such as CT scanners, MRI machines, and X-ray equipment, to achieve precise rotation and positioning of imaging components.

Surgery and Rehabilitation Robots:In robotic-assisted surgery and rehabilitation devices, slewing bearings enable accurate and controlled movement of robotic arms and components, enhancing precision and reliability during medical procedures.

6. Mining and Drilling:

Tunnel Boring Machines and Drilling Rigs:Slewing bearings are crucial for drilling equipment and tunnel boring machines, providing rotation and stability during drilling operations and ensuring constant alignment and pressure.

7. Marine and Offshore:

Marine Cranes and Shipboard Equipment:Slewing bearings contribute to the rotation and positioning of marine cranes, allowing smoother and safer handling of cargo, equipment, and containers.

Offshore Oil and Gas Equipment:In offshore drilling platforms and oil rig cranes, slewing bearings enable precise rotation and load handling for drilling, maintenance, and equipment transport.

Supplier of slewing bearing

Luoyang Longda Bearing Co., Ltd.(LDB-Bearing)was established in 1999 and is located in China’s bearing production base – Luoyang, Henan. LDB Bearing has a product range from 150mm to 4000mm in diameter slew bearing and gear rings, covering the production and manufacturing of various standard and non-standard specifications of slew bearings.

If you need slewing bearing for your project, or want to consult some related knowledge, you are welcome to contact us-LDB-Bearing– at any time, our professional technology and expertise can provide you with the best solution to meet your different needs.