Excavator Slewing Bearings Detailed description

Excavator slewing bearings, also known as slewing bearings or swing circle bearings, are specialized large-size bearings designed to handle substantial loads while providing controlled rotation. 

What is excavator slewing bearings?

Excavator slewing bearings, also known as slewing bearings or swing circle bearings, are specialized large-size bearings designed to handle substantial loads while providing controlled rotation. The excavator slewing bearing is actually a rotating joint that connects the upper and lower parts of the excavator.It allows the top of the machine to rotate 360° while the bottom remains stationary, making it possible for the operator’s cabin and attachments to swing in a circle.
It enables the excavator to work in confined spaces while maintaining stability and precision. Composed of a gear, inner and outer rings, rolling elements (balls or rollers), and seals, these bearings can support axial, radial, and moment loads, ensuring efficient and reliable operation under harsh working conditions encountered in construction or mining sites.

Features of Excavator slewing bearings

The features of Excavator slewing bearings significantly contribute to the functionality, durability, and performance of excavators in various industries. By understanding the essential characteristics of these critical components, manufacturers, operators, and maintenance personnel can ensure the reliable operation and long-lasting performance of excavators, ultimately increasing productivity and efficiency within their respective sectors.The following are some of the key features of excavator swing bearings that contribute to their reliability, durability, and effectiveness:

  1. High Load Capacity:
    Excavator slewing bearings are designed to handle axial, radial, and moment loads, even under demanding operating conditions. Their robust construction and high load-bearing capacity enable the proper functioning of the excavator, as well as ensure the safe and efficient handling of heavy loads.
  2. Durability and Longevity:
    Constructed using high-quality materials, such as carbon steel or alloy steel, Excavator slewing bearings offer reliable performance, extended service life, and high resistance against wear and tear. These components are built to withstand harsh operating conditions and maintain optimal operation throughout their lifespan.
  3. Smooth Rotational Movement:
    Excavator slewing bearings ensure smooth and precise rotational movement, allowing excavator operators to control the swing motion efficiently and accurately. Their accurate control of rotation is essential for the excavator’s versatility and application in various tasks, such as digging, loading, or demolition.
  4. Compact Design and Space-Saving:
    Excavator slewing bearings feature a compact design, allowing them to fit into the limited space between the upper and lower halves of the excavator. With their slim profile, they provide efficient support and rotation while occupying minimal space, ensuring the excavator maintains a reasonable weight distribution and streamlined construction.
  5. Low Friction
    Designed to minimize friction during rotation, Excavator slewing bearings contribute to efficient energy utilization and reduced energy consumption. Low friction also helps in extending the lifespan of the bearing by reducing wear and tear.
  6. Easy Maintenance:
    Excavator slewing bearings are designed for ease of maintenance, with lubrication points accessible for regular inspection and lubrication. Proper maintenance practices help to reduce downtime, prolong the service life of the bearing, and maintain optimal performance.
  7. Customization:
    Excavator slewing bearings are available in various sizes, types, and materials, allowing manufacturers to tailor them based on specific needs and requirements. Customization options can include different dimensions, gear designs, or material choices to suit specific excavator models and working environments.

Types of Excavator slewing bearings

The choice of excavator bearing type depends largely on the size of the excavator, the application requirements, and the loads the equipment is expected to handle. Understanding the different types of excavator swing bearings and their characteristics can help you select the right bearing to ensure optimal performance, durability, and equipment life.The following are common types of excavator bearings and their characteristics:

  1. Single-Row Ball Slewing Bearings: These bearings feature a single row of balls placed between inner and outer rings. Single-row ball slewing bearings are ideal for applications with moderate loads, offering smooth rotation and reducing the overall weight and size of the excavator. They are commonly used in small to mid-sized excavators.
  2. Double-Row Ball Slewing Bearings: Double-row ball slewing bearings have two rows of balls working together, providing better load distribution and increased load-carrying capacity compared to single-row bearings. This type of slewing bearing is suitable for larger excavators with heavier loads and greater torque requirements.
  3. Single-Row Crossed Roller Slewing Bearings: Single-row crossed roller slewing bearings consist of cylindrical rollers arranged perpendicular to one another in a single row. These bearings provide higher load-carrying capacity than the ball slewing bearings because of the increased contact area between the rollers and the rings. This makes them ideal for medium to large excavators that need to handle heavier loads and more demanding working conditions.
  4. Three-Row Roller Slewing Bearings: Three-row roller slewing bearings have three rows of rollers, each designed to accommodate a specific type of load (axial, radial, or moment loads). These bearings offer high load-carrying capacities and improved stability, making them suitable for the most heavy-duty excavators and applications with extreme weight and torque demands.
  5. Combined Ball and Roller Slewing Bearings: In some cases, a combination of ball and roller bearings is used in a single bearing to provide increased capacity and versatility. These bearings can accommodate higher loads while maintaining smooth and controlled rotation, making them suitable for various excavator sizes and applications.

Application of Excavator slewing bearings

Slewing bearings are large, durable bearings designed to accommodate heavy loads, enabling controlled rotation and torque transmission in machinery components. Their strong construction, large size, and ability to handle axial, radial, and moment loads make them perfect for heavy-duty equipment like excavators that require reliable and smooth rotation movement.Slewing bearings play a crucial role in improving the functionality, performance, and durability of excavators in the demanding conditions found within various industries, such as construction, mining, and forestry. By understanding the various applications of slewing bearings in excavator machinery and appreciating the benefits they provide, manufacturers and operators can optimize the performance of their equipment and reap the rewards of increased productivity and reduced maintenance costs:

  1. Upper Structure Rotation: The slewing bearing is situated at the base of the excavator’s upper structure, allowing the rotation of the upper body in relation to the undercarriage. This enables the excavator to maneuver and transport materials without having to reposition its tracks continually.
  2. Boom Swing Mechanism: Some excavators feature a swing bearing that enables the side-to-side motion of the boom, providing added flexibility and increasing productivity in confined spaces or when handling materials at various angles.
  3. Attachments Rotation: Slewing bearings are also used to facilitate the rotation of certain attachments, such as grapples or augers, allowing versatile positioning and operation of these accessories.
  4. Operating Cab Rotation: In specific advanced excavators, the operator’s cab is mounted on a slewing bearing, enabling the rotation of the cab independent of the upper structure and offering improved visibility and ergonomics.

Price of Excavator slewing bearings

The price of excavator slewing bearings can vary depending on several factors, including the size, load capacity, material, brand, and additional features. Smaller sized slewing bearings for mini or compact excavators tend to be less expensive compared to larger ones designed for heavy-duty excavators.
The typical price range for excavator slewing bearings starts at about $500 for small bearings, and goes up to several thousand dollars for more prominent and sturdy bearings, around $10,000. It should be noted that specific application requirements, the manufacturer’s reputation, product quality and after-sales support will also affect the final price.
When purchasing excavator slewing bearings, always consult a reputable manufacturer or supplier and compare multiple options to find the best balance between price, quality and performance for your specific needs. Be sure to consider the total cost of ownership, including maintenance, service life and potential downtime caused by low-quality products. Luoyang Longda Bearing Co., Ltd. (LDB bearing) is a company specializing in the design, development, manufacture and sale of slewing bearings and precision slewing drive devices. As a professional excavator slewing bearing supplier, our technical engineers will provide you with the best excavator slewing bearing solution.