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.

Pacific International Bearing Sales Inc. offers slewing ring bearings manufactured by Kaydon, INA , SKF and RBC. In this article I will profile the Kaydon product line due to its comprehensive offering.

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Slewing ring bearings provide optimal economy for specific envelope dimensions and are generally used in significant load carrying heavy duty applications. The gear teeth design provides for applications where precise positioning is critical. Slewing ring bearings are a perfect fit for wind turbines, robotics, aerospace, defense, general heavy equipment and industrial machinery. In this article we will explore the various design types and list applications for each.

Slewing bearings are made up of an inner ring and an outer ring, either of which usually incorporates a gear. With attachment holes in both rings, the rings enable an optimized power transmission with a simple and quick connection between adjacent machine components.

MT series slewing bearings. Kaydon MT slewing bearings provide optimal economy and capacity for its envelope. MT series heavy duty bearings are an economical replacement for kingpost designs and utilize the same four-point contact design concept as our heavier duty slewing bearings Kaydon’s MT design provides exceptional moment, thrust, and radial load capabilities. Kaydon MT slewing ring bearings are used in applications such as truck mounted cranes, hoists, and non-precision industrial tables and positioners.

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.

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Slewing bearing’s 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.

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Contact PIB Sales today to explore the possibilities of slewing bearings in enhancing efficiency and innovation in engineering applications.

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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.

Needle Bearings, also known as "Needle Roller Bearings", are Bearings that utilise small cylindrical rollers instead of the usual steel or metal balls found in Ball Bearings. These particular Bearings have a large surface area that is in contact with the Bearing outer surface, with less added clearance, making them more compact.Bearing Shop UK offers a number of Needle Bearings ideal for light duty, medium duty or heavy duty applications of different styles and sizes. Needle Bearings usually rely heavily on different components used in the automobile industry such as Rocker Arm Pivots, Transmissions, Drive Shafts, Compressors, and Pumps.Compared to typical Roller Bearings, Needle Bearings have an advantage because:- Their low sectional height enables them to support heavy loads. They offer a more cost-effective solution by making machines more compact and lightweight.- Their small rotating torque, due to a small rotating radius, improves mechanical efficiency even when subjected to frictional conditions.- Their small Bearing volume and weight allows Needle Bearings to minimise resistance, even when in motion.- They are ideal to use in machines requiring oscillating or vibrating motions.See our selection of available Bearings & Bushes and check out our other products including Ball Bearings, Roller Bearings, and many more. If you need products to help you maximise Power Transmission, take a look at our mechanical Belts & Pulleys with our most popular selection of V Belts and V Pulleys.Can't find what you're looking for? Contact us.

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Slewingring

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.

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Another manufacturer with an extensive slewing ring product line is Schaeffler’s INA brand. INA slewing rings are known worldwide and considered premium products in the field of rolling bearing technology.

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Even if radial and axial loads are obtained through general dynamic calculation, the actual load becomes greater than the calculated value due to vibration and ...

Slewing bearings are used in  diverse and critical applications across various industries, driven by their unique ability to facilitate smooth rotational movement and support heavy loads.

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Slewingbearing assembly

KH series slewing bearings are heavy duty slewing rings designed to provide precise positioning with consistent repeatability. KH series Kaydon slewing ring bearings are  used  in applications where rotation is constant, intermittent or oscillating. Applications include advanced rotary index tables or any design where the bearing will interface with other precision mechanical components.

XR series slewing bearings consist of cross rollers providing  a high degree of stiffness and low rotational torque. This design is an alternative option to  a four-point contact ball bearing not meeting the operating performance requirements for torque and stiffness. Applications requiring extra stiffness with a low torque requirement, include radar, military turrets, machine tools, and excavators.

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In construction, these bearings have facilitated the seamless movement of cranes and excavators, improving productivity and safety on construction sites. Additionally, in the aerospace and defense sectors, slewing bearings have been instrumental in the smooth movement of critical components, ensuring the precision and stability of complex systems.

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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.

The  Kaydon RK series is a pre-engineered light profile slewing bearing which offers high performance and reduced weight. With its optimized geometry the RK series handles a combination of moment and thrust loads. Applications for Kaydon RK slewing bearings are  foundry shakeout tables, palletizers, wire winders, cable reels, welding tables and turntable applications where intermittent rotation and low velocity are present.

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.

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The  advantages of slewing bearings lie in their ability to support substantial axial, radial, and moment loads, while simultaneously facilitating smooth and precise rotation. Their compact design and high load-carrying capacity make them an ideal choice for equipment that requires both durability and flexibility.

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Slewing bearings are  generally large rolling bearings that accommodate axial, radial and moment loads acting either singly or in combination and in any direction. They can perform both slewing (oscillating) movements as well as rotational movements.

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.

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In the heavy machinery industry, slewing bearings are indispensable components in equipment such as cranes, excavators, and earthmovers. Their ability to handle heavy loads and enable 360-degree rotation is crucial for efficient and safe operations.

Slewingbearing application

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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.

XT series slewing bearings are custom designed with a rectangular cross section, and are available in sizes up to 218 inches OD (5500 mm). Kaydon XT slewing bearings are used in a  wide range of applications where other series do not meet size, capacity, or weight requirements. Applications include cranes, aerial lifts, excavators, wind turbines, utility derricks, log loaders and fellers, and feller heads.

The Kaydon HS series pre-engineered, light profile slewing rings feature rectangular cross sections, which provide for alternate hole patterns. The HS design improves stiffness and has the potential for more capacity. Applications  for the HS design are cranes, aerial lifts, digger derricks, chute swivels, lift truck rotators, and industrial turntables.

The renewable energy sector harnesses the capabilities of slewing bearings to improve the efficiency and performance of solar tracking systems and wind turbines.

Kaydon HT series slewing bearings are larger versions of the HS series, with increased ball diameter and cross-sectional area providing significantly more capacity. The internal configuration consists of deep groove gothic arch raceways and maximum ball complement, resulting in a four-point contact bearing that provides exceptional moment, thrust, and radial load capacities. As with most manufacturers these can be ordered with no gear, or with an internal or external gear.The Kaydon HT design is ideal for medium to heavy duty applications including cranes, aerial lifts, digger derricks, chute swivels, lift truck rotators, and industrial turntables.

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Wind energy slewing bearings – Kaydon is  North America’s leading windmill slewing ring  bearing company. Kaydon Engineering  has many years of experience  to support critical pitch, yaw and gearbox applications in systems ranging from  200 kW to 5.0 MW.

TR series slewing bearings consist of three-row roller bearings, having the largest capacity for a given diameter. The TR series is the next option to  XR or DT series bearings that don’t  meet specific stiffness and capacity requirements. Kaydon TR series roller bearings optimize capacity, provide low frictional resistance and minimize deflection. Kaydon TR series are used in heavy duty circumstances needing extra stiffness and capacity. Applications include  radar, cranes, excavators, stackers and reclaimers, and heavy mill equipment.

DT series slewing bearings series consists of the eight-point ball bearing which provides maximum load capacity for given envelope and bolt circle diameters. Kaydon Dt series provides up to an 80% increased capacity with a single row four-point design. The DT slewing ring bearing has a smaller profile than a three-row roller design and provides exceptional moment, thrust, and radial loads. Applications include heavy duty machinery, large excavators,  cranes, mining equipment, wind turbines, and telescopes.

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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.

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.

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.

One of the critical factors contributing to the success of slewing bearings is the continuous development and advancements in their design and manufacturing processes. Innovations in materials, lubrication techniques, sealing mechanisms, and raceway profiles have led to enhanced performance, reliability, and longevity of these bearings.

Moreover, slewing bearings have played a pivotal role in driving progress in various industries. In the renewable energy sector, slewing bearings have enabled the efficient tracking of solar panels and wind turbines, harnessing more clean energy and contributing to sustainable development.