Slewing Ring Bearings
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They are developed from several safety, high temperature resistance, wear resistance and other requirements.
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The company's products are exported to ten countries including Russia, Lithuania, Iran, and Dubai.
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Product Features In order to obtain low friction torque, high rigidity, and good rotation accuracy of the bearing, steel balls with small outer diameters are used. The use of hollow shafts ensures light weight and space for wiring.
Product Features In order to obtain low friction torque, high rigidity, and good rotation accuracy of the bearing, steel balls with small outer diameters are used. The use of hollow shafts ensures light weight and space for wiring. Thin-walled bearings realize an extremely thin bearing section.
According to whether the ring has ribs or not, it can be divided into single row cylindrical roller bearings such as NU, NJ, NUP, N, NF, and double row cylindrical roller bearings such as NNU and NN. The bearing is a structure in which the inner ring and the outer ring can be separated.
Cylindrical rollers and raceways are linear contact bearings. Load capacity, mainly bear radial load. The friction between the rolling element and the rib of the ring is small, which is suitable for high-speed rotation.
Double Row Tapered Roller Bearings
Tapered roller bearings refer to radial thrust rolling bearings whose rolling elements are tapered rollers. There are two kinds of small cone angle and large cone angle.
Sliding bearings have neither inner and outer rings nor rolling elements, and are generally made of wear-resistant materials. Commonly used in low speed, light load and mechanical rotating parts that are difficult to lubricate and maintain.
Thrust Spherical Roller Bearings
Thrust ball bearing composition: Thrust ball bearing consists of three parts: seat washer, shaft washer and steel ball cage assembly. The shaft washer matched with the shaft and the seat ring matched with the housing.
According to the force, it is divided into one-way thrust ball bearings and two-way thrust ball bearings. One-way thrust ball bearing can bear one-way axial load. Two-way thrust ball bearing can bear two-way axial load, in which the shaft ring is matched with the shaft.
What is Slewing Ring Bearings?
Slewing ring bearings, also known as slewing rings or turntable bearings, are large-diameter, heavy-duty rolling-element bearings. They are specifically designed to sustain substantial loads, including radial, axial (both directions), and moment loads, simultaneously.
Working Principles Of Slewing Ring Bearings
Slewing Ring Bearings fundamental working principles are based on the interaction of rolling elements, such as balls or cylindrical rollers housed between an inner and outer ring. These elements are responsible for transmitting and distributing loads, including axial, radial, and moment forces, thereby allowing the bearing to support heavy loads with precision.
Step 1 – Initial Positioning
The process begins with the slewing bearing positioned between the two components that require rotational movement. The inner and outer rings are mounted securely to the respective components.
Step 2 – Load Application
When an external load is applied to one or both of the components, it generates forces in different directions, including axial, radial, and moment loads. These forces act on the slewing bearing, creating a demand for load-carrying capabilities.
Step 3 – Rolling Element Interaction
The rolling elements, such as balls or cylindrical rollers, housed within the slewing bearing come into play. These elements are positioned between the inner and outer rings. Their precise arrangement allows for the transmission and distribution of the applied loads.
Step 4 – Load Distribution
As the external load is transmitted to the slewing bearing, the rolling elements start distributing the load across their contact surfaces and the raceways of the inner and outer rings. The raceways are the specially designed grooves on which the rolling elements move.
Step 5 – Optimized Raceway Geometry
The raceway geometry of the slewing bearing is engineered to optimize load distribution. This design helps minimize stress concentrations and ensures uniform load-carrying capabilities in multiple directions, contributing to the bearing's high load capacity.
Step 6 – Load Resistance
The rolling elements, in combination with the raceway design, resist the applied loads effectively. This load resistance is essential to prevent deformation and failure of the bearing under heavy loads, making it suitable for applications requiring robust motion control and stability.
Step 7 – Smooth Rotation
As the load is distributed and resisted, the slewing bearing allows for smooth rotation between the two components. The rolling elements facilitate low-friction movement, minimizing energy losses and reducing wear during rotation.
Step 8 – Precise Motion Control
The precise arrangement of rolling elements and optimized raceway geometry contribute to accurate motion control during rotation. This level of precision is crucial, especially in applications like robotics and aerospace, where precise movements are necessary for the system's optimal performance.
Step 9 – Load Redistribution
During rotation, the external load may change in magnitude or direction. The slewing bearing continuously redistributes these loads across its rolling elements and raceways to maintain stability and smooth operation.
Step 10 – Longevity and Reliability
The combination of advanced materials, engineering, and rigorous testing ensures the longevity and reliability of slewing bearings. These bearings are designed to withstand continuous operation under varying loads and environmental conditions.
Step 11 – Diverse Applications
Due to their exceptional load-carrying capabilities, smooth rotation, and precise motion control, slewing bearings find diverse applications in heavy machinery, aerospace, renewable energy, marine, and robotics. Their versatility and reliability have made them indispensable components in modern engineering practices.
Types of Slewing Ring Bearings
Rectangular Standard Capacity Slewing Ring
Slewing Ring Bearings are designed to accommodate significant radial, thrust and moment loads with options for non-gear or external gear. rectangular 4-point contact slewing ring offers several benefits due to its design. It provides improved load distribution, higher load-carrying capacity, and enhanced stability compared to other slewing ring configurations.
Rectangular High Capacity Slewing Rings
The rectangular high capacity slewing ring boasts several features that make it a versatile choice for various high capacity applications. Its design includes a larger ball diameter and optimized internal structure. This results in higher load-carrying capacity, improved stiffness, and greater durability.
Flanged Slewing Ring
The SK6 Flanged Slewing Ring Bearings simplify mounting, enhance load distribution, and offer controlled rotation options. The inclusion of gears, whether internal or external, adds the ability to transmit power efficiently, making these designs valuable across a wide range of industries and applications.
Applications Of Slewing Ring Bearings
The versatility and efficiency of slewing ring bearings makes them ideal for use in a range of industries and applications, from military and defense equipment to manufacturing and transportation. Common applications include:
Military and Defense: Slewing ring bearings are often used in military and defense equipment that must direct heavy loads with a high degree of precision. They can be found in missile launchers, tank turrets, and optical devices, among many others.
Construction: The construction industry benefits from the use of slewing rings, particularly in load-bearing and lifting applications, such as lifts, cranes, hydraulic excavators, and borers.
Bottling Technologies: The 360-degree rotation of slewing rings makes them especially useful for industrial bottling applications including sanitization, washing capping, and labeling functions.
Mining: Slewing rings are frequently used in mining excavation and tunnel boring, where equipment must be able to move freely under heavy loads.
Transportation: Trains, trams, and subways often use slewing rings to facilitate free and easy vehicle movement.
Tooling and Machining: Slewing ring bearings are often used to facilitate movement in precision machine tools. They allow for free multi-axis movement of machine tool spindles in precision milling and turning applications.
Inner and Outer Ring
The bearings are comprised of two rings, each of which contains a precision raceway that is induction hardened on the surface to a specified depth. Each ring is made from a medium carbon steel forging.ST Series bearings have raceways constructed in a four-point contact configuration, with 45° contact angles as standard. Other raceway configurations are available, such as crossed roller and eight-point contact. These other options are often considered in cases where very high loads or special stiffness requirements are needed.
Rolling Elements
Precision rolling elements (specifically hardened chrome alloy steel balls for SK and ST Series bearings) facilitate relative ring rotation between the inner and outer rings. Rollers as rolling elements are also often used.
Spacers, Spacer Balls & Separators
Spacers, typically made from a plastic material, are commonly used to separate balls to prevent them from rubbing directly against each other. Sometimes spacer balls are utilized instead of spacers. In this case these are balls that are slightly smaller than the load carrying balls, placed between each load carrying ball. Occasionally, application parameters warrant the use of a separator.
Taper Pin
Secures load plug to the inner or outer ring.
Mounting Holes
Mounting holes are generally spaced around the faces of the inner and outer ring along a uniform bolt circle and equal spacing. These holes can be thru holes, tapped holes, blind tapped holes, counter-bored holes, etc. Sometimes bolt circle or spacing requirements need to be customized to meet the demands of a specific application, in which case custom options are available.
Seals
Seals are provided on each side of the bearing, with their primary functions being grease retention and prevention of some contamination such as dust and debris from entering the bearing. The seals are typically made from an extruded Buna-N rubber strip, and in smaller sizes are a metallic non-contact shield.
Load Plug
Due to the nature of the race hardening process, there is a gap in the race hardness of each race. In that location for the non-geared ring, or the outer ring for ungeared bearings, a hole is drilled to permit the loading of balls into the final slewing ring assembly. This hole is plugged and secured with a taper pin.
Taper Pin
Secures load plug to the inner or outer ring.
Gear
Slewing ring bearings can be supplied as ungeared, or with gears on either the ID of the inner ring or the OD of the outer ring. Gears are typically a standard stub involute spur gear with backlash provisions and AGMA Q8 quality minimum.
Grease Fitting
At least one grease fitting is included in one of the rings. The quantity may increase with the diameter of the bearing. For bearings with gears, the grease fitting(s) are located on either the ID or OD of the ungeared ring.
Part Numbers
Part numbers and serial numbers are etched on one of the faces of the bearing.
Key Benefits of Slewing Ring Bearings
Versatile Load Spectrum
Slewing ring bearings provide 360-degree joint support for complex load bearing systems, which allows for concurrent movement on multiple axes.
Shaftless Design
Slewing rings are designed to operate without a shaft or spindle, thereby enhancing bearing motion and allowing space for additional operational components.
Load Carrying Capacity
Slewing ring bearings are designed to handle the movement of heavy loads with great efficiency.
Ideal Stiffness
Although they are designed to facilitate a wide range of motion, slewing ring bearings exhibit high material stiffness to ensure sufficient support in rigid bearing applications.
Low Friction
Slewing bearings are particularly valuable for their low-friction and freedom of movement, which enhances process efficiency while increasing the service life of the bearing and surrounding equipment.
Extended Service Life
Slewing ring bearings offer a highly durable, low friction load-bearing option that reduces the stress and friction on the bearing and interacting components. The reduced equipment wear helps to extend the service life of the bearing and the system as a whole.
Key Maintenance Practices for Slewing Ring Bearings
Regular Lubrication
To keep running smoothly, slew bearings need the right kind of grease. The choice depends on how and where the machine is used.
There's lithium complex grease for everyday jobs, polyurea for hot and heavy work, aluminum complex for wet places, and synthetic greases for very hot or cold conditions.
Lubrication Schedule
A good rule of thumb for lubrication is to do it every 100 hours of operation. But if the machine runs at high speed or works in tough conditions, it might need more frequent lubrication. Always check what the machine's maker suggests for best results.
Lubrication Procedure
Proper lubrication of a slew bearing is crucial for its longevity and high performance.
Visual Inspection
Regular visual inspections of slewing rings are vital to spot problems early, like cracks, broken seals, rust, and wear. These problems that can cause equipment failure if not fixed.
Noise and Vibration Monitoring
Strange noises and vibrations might be signs that there's an issue with the bearings. This could be due to misalignment, insufficient lubrication, or wear and tear. If you hear a squealing sound, it could mean that the bearing needs more lubrication. A grinding noise could mean the parts are rubbing together because they're worn. Paying attention to these signs is crucial to fix things before they get worse.
Our Factory
The company's products are exported to more than a dozen countries such as Russia, Lithuania, Iran, and Dubai. During the development of the company, a team of talents with reasonable structure, proficient business, superb technology, courage to develop and innovate and high loyalty has been created. The company firmly believes that the value of the brand itself lies in quality, and it is necessary to establish an honest and responsible system for users in order to produce bearing products with market competitiveness. Professional and technical personnel strictly check the whole process from factory inspection to product safety inspection to ensure first-class product quality.
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