Tag Archive for: Slewing Bearings

In the rapid development of modern industry and technology, Magnetic slewing Bearings, as an innovative non – contact transmission technology, are gradually emerging in multiple special fields with their unique working principles and excellent performance. They have become a key driving force for promoting technological upgrades in related industries.

What is Slewing Bearing?

The slewing bearing is a large – scale bearing that can withstand comprehensive loads and is used to support and enable relative rotation between mechanical components. It generally consists of an inner ring, an outer ring, rolling elements, and a cage. Slewing bearings can simultaneously bear axial forces, radial forces, and overturning moments. They are widely used in large – scale machinery such as cranes, excavators, and wind turbines. In cranes, it enables the boom to rotate smoothly for accurate lifting and handling of goods; in wind turbines, it allows the nacelle to flexibly align with the wind direction. With its stable and flexible rotation characteristics, the slewing bearing ensures the normal operation of equipment, improves work efficiency and reliability, and is an indispensable key component in large – scale machinery.

Working Principle of Magnetic slewing Bearings

The working principle of Magnetic slewing Bearings is based on the basic laws of electromagnetism. It mainly consists of electromagnets, sensors, and controllers. The electromagnets generate a controllable magnetic field. When the rotor (the object being supported) placed in the magnetic field is disturbed by an external force and deviates from its equilibrium position, the sensor quickly detects the displacement change of the rotor and transmits the signal to the controller. The controller precisely adjusts the magnitude and direction of the current in the electromagnet according to the received signal, thereby changing the magnetic field strength and distribution. This generates a magnetic force opposite to the disturbing force, causing the rotor to return to the equilibrium position, thus achieving non – contact support and stable operation.

Significant Advantages of Magnetic slewing Bearings

Compared with traditional mechanical slewing bearings, Magnetic slewing Bearings have significant advantages. Due to the absence of mechanical contact, Magnetic slewing Bearings fundamentally eliminate friction and wear, greatly reducing energy losses, improving transmission efficiency, and reducing component replacement and maintenance costs caused by wear. In addition, they can adapt to extremely high rotational speeds and generate minimal vibration and noise during operation, which is crucial for equipment with strict requirements for accuracy and stability. In a vacuum environment, the lubrication problem of traditional bearings is difficult to solve, while Magnetic slewing Bearings do not require lubrication, avoiding pollution of the vacuum environment by lubricant volatilization and demonstrating good adaptability.

Key Applications in High – Speed Rotating Equipment

In the field of high – speed rotating equipment, Magnetic slewing Bearings have become a core technical support. In the case of high – speed motors, as the industrial requirements for motor speed and efficiency continue to increase, traditional bearings limit further breakthroughs in motor performance. The application of Magnetic slewing Bearings liberates high – speed motors from the constraints of mechanical friction, significantly increasing the rotational speed and enhancing the power density. They are widely used in aerospace, electric vehicles, high – speed machining, and other fields. For example, in the auxiliary power unit of an aircraft engine, a high – speed motor with Magnetic slewing Bearings can more efficiently provide electricity and compressed air for the aircraft, improving the overall performance of the aircraft. In the field of centrifugal compressors, Magnetic slewing Bearings also play a crucial role. Centrifugal compressors are widely used in industries such as petrochemical and natural gas transportation, and have extremely high requirements for reliability and efficiency. The non – contact support characteristic of Magnetic slewing Bearings effectively reduces the internal friction and energy consumption of compressors, improves the compression efficiency, extends the equipment service life, and reduces the risk of production interruptions caused by equipment failures.

Important Value in Vacuum Environments

The vacuum environment is another important application scenario for Magnetic slewing Bearings. In semiconductor manufacturing equipment such as lithography machines and etching machines, the requirements for environmental cleanliness and equipment accuracy are almost stringent. The volatilization of lubricants from traditional bearings can contaminate the vacuum environment and affect the manufacturing quality of semiconductor chips. Magnetic slewing Bearings do not require lubrication and produce no particles, which can meet the ultra – high cleanliness requirements. At the same time, their high – precision support characteristics ensure that the equipment operates stably at the nanometer – level accuracy, providing strong support for the development of the semiconductor industry towards higher – process technologies. In the field of space exploration, various precision instruments in satellites and spacecraft need to operate stably in a vacuum and microgravity environment. Magnetic slewing Bearings, with their non – contact, non – lubrication, and high – reliability characteristics, provide an ideal support solution for these instruments. For example, in the inertial navigation system of a satellite, a gyroscope supported by Magnetic slewing Bearings can more accurately measure the attitude change of the satellite, improving the navigation accuracy and ensuring that the satellite can complete various tasks in the complex space environment.

Future Prospects of Magnetic slewing Bearings

With the continuous progress of science and technology, Magnetic slewing Bearings have broad prospects for future development. At the technical research and development level, further improving the load – bearing capacity and stiffness of Magnetic slewing Bearings is a key direction. By optimizing the electromagnetic structure design, using new magnetic materials, and improving the control algorithm, it is expected to enable Magnetic slewing Bearings to be more widely used in the heavy – load field. At the same time, enhancing the dynamic response performance of Magnetic slewing Bearings so that they can quickly and accurately adjust the support force under more complex working conditions will expand their application boundaries in the fields of high – speed and high – precision motion control. From the perspective of market applications, with the booming development of strategic emerging industries such as new energy vehicles, high – end equipment manufacturing, and semiconductors, the demand for Magnetic slewing Bearings will continue to grow. Especially in the electric drive systems of new energy vehicles, Magnetic slewing Bearings are expected to replace traditional bearings, improving motor efficiency and vehicle range, and becoming an important breakthrough point for future new energy vehicle technology upgrades.

Prices of Slewing Bearings

There are many factors that affect the price of slewing bearings. Firstly, raw materials play a significant role. High – quality steel has a high cost, and products made from it have excellent performance and long service life, so the price is also high. Secondly, slewing bearings with complex manufacturing processes and high – precision requirements need advanced equipment and strict quality control, which will also increase the price accordingly. Moreover, the larger and more special the size and specifications are, the greater the processing difficulty and material consumption, and the higher the price will be

Suppliers of Slewing Bearings

The products of Ldb bearing company cover a wide range. Whether it is standard – sized or non – standard slewing bearings, they can be manufactured with high quality to meet the diverse needs of different customers. Advanced production and testing equipment are the foundation of high – quality products. Ldb bearing company deeply understands this and is equipped with nearly 30 sets of various types of equipment, providing hardware support for precision processing. At the same time, the company has an experienced design and technical team that continuously optimizes product designs and overcomes technical problems. In the future, it is believed that it will continue to adhere to the concept of innovation and quality supremacy, shine more brightly in the global market, and contribute more to the development of various industries.

Innovation in bearing lubrication technology is a crucial approach to improving mechanical transmission efficiency and reducing energy consumption. The research and development of new lubricants and the application of intelligent lubrication systems have already brought significant economic and environmental benefits to the machinery industry.

What is Slewing Bearing?

The slewing beaing is an integrated power transmission device that combines the functions of a slewing bearing and a drive system. It mainly consists of components such as a motor, a reducer, a slewing bearing, and a brake. The motor provides power, which is decelerated and torque – increased by the reducer and then drives the slewing bearing to rotate, enabling the circular motion of equipment components. The slewing beaing can precisely control the rotation angle and speed, and has the advantages of a compact structure, convenient installation, and high transmission efficiency. It is commonly used in fields such as solar tracking systems, industrial robots, and port machinery. In a solar tracking system, the slewing beaing can accurately adjust the angle of the solar panel according to the position change of the sun, improving the solar energy utilization rate and effectively enhancing the working performance and automation level of the equipment.

Dilemmas of Traditional Lubrication Methods

Traditional bearing lubrication mostly uses mineral oil or grease, which can meet certain lubrication requirements under normal working conditions. However, under extreme conditions such as high – speed, heavy – load, and high – temperature, their limitations become prominent. Mineral oil is prone to oxidation and deterioration at high temperatures, resulting in a decline in lubrication performance and an increase in the friction coefficient. This not only reduces the transmission efficiency but also shortens the bearing life due to excessive wear. Grease has poor fluidity during high – speed operation, making it difficult to achieve full lubrication and likely to cause local overheating, further increasing energy consumption. Therefore, it is urgent to develop new lubricants.

Synthetic Lubricants: The “New Favorites” in the Lubrication Field

Advantages and Applications of Synthetic Ester Lubricants

In recent years, synthetic lubricants have become a research hotspot, and synthetic ester lubricants have performed particularly well. They have excellent thermal stability, low volatility, and good lubrication performance, showing significant advantages under high – temperature and high – speed conditions. They can form a more stable and thinner lubricating film on the bearing surface, effectively reducing the friction resistance and greatly improving the transmission efficiency. For example, in the high – speed bearings of aircraft engines, the use of synthetic ester lubricants can significantly reduce the energy loss caused by friction, improve the fuel efficiency of the engine, and reduce carbon emissions.

Characteristics and Value of Polyalphaolefin (PAO)

Polyalphaolefin (PAO) is also a synthetic lubricant with excellent performance. Its characteristics of a low pour point and a high viscosity index enable it to maintain good fluidity in low – temperature environments, ensuring normal bearing lubrication. At high temperatures, its viscosity changes little, and it can maintain a stable lubrication effect. Using PAO lubricants in the gearbox bearings of wind turbines can not only reduce the friction torque during low – temperature startup and decrease energy consumption but also ensure reliable bearing lubrication during high – temperature operation and extend the equipment maintenance cycle.

Intelligent Lubrication Systems: Ushering in a New Era of Lubrication

Working Principle of Intelligent Lubrication Systems

In addition to new lubricants, intelligent lubrication systems have brought a revolutionary change to bearing lubrication technology. The traditional fixed – time and fixed – quantity lubrication method cannot be adjusted in real – time according to the actual operating conditions of the bearing, which is likely to lead to waste of lubricants or insufficient lubrication. Intelligent lubrication systems use sensors, controllers, and actuators to achieve precise monitoring and control of the bearing lubrication state. The sensors are installed at key positions of the bearing to collect parameters such as temperature, speed, and load in real – time. The controller uses advanced algorithms to accurately calculate the required lubricant quantity and time based on these data and then controls the actuator to supply oil precisely, ensuring that the bearing is always in the optimal lubrication state.

Application Results of Intelligent Lubrication Systems in Large – Scale Equipment

In large – scale industrial equipment, such as mining equipment, intelligent lubrication systems show their full advantages. Such equipment operates in harsh environments with frequent load changes, and traditional lubrication methods are difficult to meet the requirements. Intelligent lubrication systems can dynamically adjust the lubrication strategy according to the actual operating conditions of the equipment, which can not only reduce the consumption of lubricants but also reduce the equipment failure rate and improve production efficiency. For example, after an electric – wheel dump truck in a large open – pit mine adopted an intelligent lubrication system, the lubrication effect of the wheel – side reducer bearings was significantly improved, the number of maintenance times was greatly reduced, the vehicle operation efficiency increased by 15%, and the lubricant consumption decreased by 30%.

Extended Functions of Intelligent Lubrication Systems

Intelligent lubrication systems can also be integrated with the equipment remote monitoring system to achieve remote diagnosis and fault warning. By analyzing the lubrication data, potential bearing fault hazards can be detected in advance, and maintenance measures can be taken in a timely manner to avoid huge losses caused by sudden equipment failures.

Future Blueprint of Lubrication Technology

With the development of emerging technologies such as the Internet of Things, big data, and artificial intelligence, there is broad space for innovation in bearing lubrication technology. In the future, the research and development of lubricants will pay more attention to green environmental protection and multi – function integration. For example, products with functions such as lubrication, anti – wear, and self – repair will be developed to further improve the comprehensive performance of bearings. Intelligent lubrication systems will develop towards intelligence, networking, and collaboration, realizing the sharing and optimized allocation of lubrication resources among multiple devices and constructing an efficient and energy – saving industrial lubrication ecosystem.

Prices of Slewing Bearings

There are many factors affecting the prices of slewing bearings. Firstly, raw materials play a significant role. High – quality steel has a high cost, and products made from it have excellent performance and long service life, thus having a high price. Secondly, slewing bearings with complex manufacturing processes and high – precision requirements need advanced equipment and strict quality control, which will also increase the price accordingly. Moreover, the larger and more special the size and specifications are, the greater the processing difficulty and material consumption, and the higher the price will be.

Suppliers of Slewing Bearings

Advanced production and testing equipment are the foundation of high – quality products. Ldb bearing company deeply understands this and is equipped with nearly 30 sets of various types of equipment,providing hardware support for precision processing. At the same time, the company has an experienced design and technical team. With their profound professional knowledge and innovative spirit, they continuously optimize product designs and overcome technical problems. In terms of services, Ldb bearing company is also remarkable. It strictly controls the production progress and quality to ensure the on – time and high – quality delivery of products. Engineers are always ready to provide technical consultation services such as installation and maintenance. Regular satisfaction surveys are also carried out to collect customer feedback and continuously improve products and services.

In the operation of mechanical systems, there exists a complex and close – knit relationship between tilt and slewing bearings. Tilt can stem from various factors such as equipment installation errors, external forces during operation, and foundation settlement. It has a significant impact on the performance and lifespan of slewing bearings, as well as the stability of the entire mechanical system.

What is Slewing bearing?

The slewing bearing is a large – scale slewing bearing capable of withstanding comprehensive loads, which is used to support and enable relative rotation between mechanical components. It typically consists of an inner ring, an outer ring, rolling elements, and a cage. Slewing bearings can simultaneously bear axial forces, radial forces, and overturning moments. They are widely applied in large – scale machinery like cranes, excavators, and wind turbines. In cranes, slewing bearings allow the boom to rotate smoothly for accurate cargo lifting; in wind turbines, they enable the nacelle to align flexibly with the wind direction. Thanks to their stable and flexible rotation characteristics, slewing bearings ensure the normal operation of equipment, enhance work efficiency and reliability, and are indispensable key components in large – scale machinery.

The Adverse Effects of Tilt on Slewing bearings

The impact of tilt on slewing bearings is most prominently manifested in uneven load distribution. When mechanical components tilt, the load borne by the slewing bearing becomes unevenly distributed. Take automotive wheel hub slewing bearings as an example. If a vehicle drives on an uneven road and the body tilts, the pressure on different parts of the wheel hub slewing bearing will vary. The rolling elements that originally shared the load evenly will experience different levels of pressure, with some slewing bearing greater loads and others less. Over an extended period, the contact areas between the heavily – loaded rolling elements and the raceways will suffer from excessive wear, resulting in damage such as fatigue spalling and scratches on the surface, severely affecting the slewing bearing’s service life. Moreover, uneven load distribution increases the internal friction of the slewing bearing, generating more heat and further accelerating the slewing bearing’s aging and failure.

Tilt also alters the slewing bearing clearance. Clearance is a crucial parameter for the normal operation of slewing bearings. An appropriate clearance ensures that the rolling elements can roll freely and with a certain degree of flexibility during operation. When mechanical components tilt, the relative positions of the inner and outer rings of the slewing bearing change, thus changing the clearance. A reduced clearance may intensify the friction between the rolling elements and the raceways, and may even cause jamming. An increased clearance, on the other hand, will lead to a decline in the slewing bearing’s rotational accuracy, causing vibration and noise during the operation of the mechanical system. In the spindle slewing bearings of precision machine tools, even a slight change in clearance can affect the machining accuracy, resulting in dimensional deviations and increased surface roughness of the machined parts.

In addition, tilt increases the axial force on the slewing bearing. Under normal circumstances, the axial load – slewing bearing capacity of a slewing bearing is determined according to the design requirements. However, when the machine tilts, part of the original radial load may be converted into an axial load. For instance, when the nacelle of a wind turbine tilts under the action of strong winds, the slewing bearings in the nacelle will not only bear their own radial load but also an additional axial force caused by the tilt. If the axial load – slewing bearing capacity of the slewing bearing is insufficient, problems such as axial displacement and aggravated wear are likely to occur. In severe cases, it can lead to failures in the entire wind power generation system.

Optimization Measures

To counteract the adverse effects of tilt on slewing bearings, a series of targeted measures are necessary. During the equipment installation process, strict control over installation accuracy should be maintained. High – precision measuring tools and calibration methods should be employed to ensure the horizontal installation of the equipment, minimizing tilt caused by improper installation. For working environments where tilt is likely to occur, regular inspections and adjustments of the equipment should be carried out to detect and correct tilt problems promptly. When selecting slewing bearings, appropriate slewing bearing types should be chosen based on the equipment’s working conditions and potential tilt situations. For example, for equipment prone to tilt, self – aligning ball slewing bearings or self – aligning roller slewing bearings can be selected. These types of slewing bearings have an automatic self – aligning function, which can compensate for misalignment issues caused by tilt to a certain extent, ensuring the normal operation of the slewing bearings.

Furthermore, optimizing the structure and materials of the slewing bearing can enhance its resistance to tilt. Using high – strength and wear – resistant materials to manufacture the rolling elements and raceways of the slewing bearing can reduce wear caused by uneven loading and increased friction. In terms of structural design, measures such as increasing the slewing bearing’s load – slewing bearing area and improving the sealing structure can help improve the slewing bearing’s performance under tilted conditions. Additionally, by leveraging advanced monitoring technologies to monitor the slewing bearing’s operating status in real – time, including parameters such as temperature, vibration, and noise, maintenance and adjustments can be carried out promptly once abnormalities are detected, preventing the problem from worsening.

The relationship between tilt and slewing bearings has a far – reaching impact on the operation of mechanical systems. Understanding the various effects of tilt on slewing bearings and implementing effective countermeasures are crucial for ensuring the normal operation of slewing bearings, extending the service life of equipment, and enhancing the reliability and stability of mechanical systems. In all aspects of mechanical design, manufacturing, and use, the tilt factor should be fully considered, and attention should be paid to the performance changes of slewing bearings to ensure the safe and efficient operation of the entire mechanical system.

Prices of Slewing bearings

There are numerous factors influencing the prices of slewing bearings. Firstly, raw materials play a significant role. High – quality steel, with its high cost, can be used to manufacture products with excellent performance and long service life, thus commanding a high price. Secondly, slewing bearings with complex manufacturing processes and high – precision requirements necessitate advanced equipment and strict quality control, which will also drive up the price. Moreover, the larger and more specialized the size and specifications are, the greater the processing difficulty and material consumption, and consequently, the higher the price.

Suppliers of Slewing bearings

In the field of slewing bearings, Ldb bearing company stands out like a brilliant star, shining globally with its remarkable quality and innovative capabilities. Since its establishment in Luoyang, China’s slewing bearing production base, in 1999, through its profound heritage and unremitting efforts, it has become a leading enterprise in the industry. Ldb bearing company offers a wide range of products. Whether it’s standard – sized or non – standard slewing bearings, it can produce them with high quality to meet the diverse needs of different customers. Its products are widely used in multiple fields, a testament to its strong strength.

Slewing bearings, as crucial components in numerous mechanical equipments, have a complex and intricate manufacturing process. This process involves multiple key steps, and each step significantly impacts the quality and performance of the final product.

What is Slewing Bearing?

The slewing bearing is a large – scale bearing capable of withstanding comprehensive loads. It is used to support and connect mechanical components that need to rotate relative to each other. It typically consists of an inner ring, an outer ring, rolling elements, and a cage. Slewing bearings can simultaneously bear axial forces, radial forces, and overturning moments, and are widely applied in large – scale mechanical equipments such as cranes, excavators, wind turbines, and port machinery. Its function is to enable the rotating parts of the equipment to rotate stably and flexibly, ensuring the normal operation of the equipment, improving its working efficiency and reliability. It is an indispensable key component in many large – scale machines.

Raw Material Procurement and Inspection

The quality of raw materials serves as the foundation for the performance of slewing bearings. The main raw materials include high – quality steel, such as medium – carbon alloy steel, which is used to manufacture key components like inner and outer rings, as well as steel for rolling elements (steel balls or rollers). When purchasing, it is necessary to carefully screen suppliers to ensure that the materials meet national standards and design requirements. After the arrival of the goods, conduct a comprehensive inspection of the raw materials. Use spectral analysis to detect chemical components, evaluate mechanical properties through hardness tests and tensile tests, and check for internal and surface defects using ultrasonic flaw detection and magnetic particle flaw detection. Only raw materials with qualified indicators can enter the production process.

Part Machining of Slewing Bearings

Inner and Outer Ring Machining

Firstly, cut the steel to obtain blanks of appropriate sizes. In the rough turning process, remove most of the allowance, leaving a machining allowance of 0.5 – 1 mm for subsequent finish machining to improve processing efficiency. Finish turning ensures the dimensional accuracy and surface roughness of the inner and outer rings. The dimensional tolerance of the raceway part is controlled within ±0.01 mm, and the surface roughness reaches Ra0.8 – Ra1.6μm. In the milling process, machine structures such as mounting holes and keyways to ensure position accuracy. After the processing is completed, measure the dimensional accuracy again to ensure compliance with the design drawings.

Rolling Element Machining

If steel balls are used, process the steel into spherical blanks, and through processes such as rough grinding, fine grinding, and lapping, gradually improve the dimensional accuracy and surface quality of the steel balls, and control the roundness error within a very small range. The machining of rollers includes turning the outer circle, grinding, and lapping to ensure the cylindricity and surface roughness of the rollers and ensure smooth rolling within the raceway.

Cage Machining

Manufacture the cage by stamping, injection molding, or machining according to design requirements. Stamped cages are suitable for mass production with high efficiency; injection – molded cages have low costs and light weights; machined cages have high precision. After processing, check the dimensional accuracy, structural integrity, and surface quality of the cage to ensure that it can evenly separate the rolling elements and reduce friction and wear between the rolling elements.

Heat Treatment of Slewing Bearings

Quenching and Tempering

Inner rings, outer rings, and rolling elements need to undergo heat treatment after machining. Quenching can improve the hardness and strength of the material. Heat the parts to an appropriate temperature, hold for a certain period of time, and then cool rapidly. Tempering relieves the internal stress generated during quenching and adjusts hardness and toughness. Heat the quenched parts to a range lower than the quenching temperature, hold, and then cool. Through appropriate quenching and tempering processes, the comprehensive mechanical properties of the parts reach the optimal state.

Surface Treatment

To improve the wear resistance, corrosion resistance, and fatigue life of slewing bearings, surface treatment is often carried out. For example, use chemical heat treatment methods such as carburizing and nitriding to form a high – hardness hardened layer on the surface of the parts; or perform surface coating treatments such as electroplating and spraying to cover a protective film on the surface of the parts.

Assembly of Slewing Bearings

Cleaning and Inspection

Before assembly, thoroughly clean all parts to remove impurities such as oil stains and iron filings remaining during the machining process. After cleaning, check the dimensional accuracy, surface quality, and appearance of the parts again to ensure there are no defects or damages.

Assembly Process

First, fix the inner ring on the assembly platform, install the cage, and then install the rolling elements between the cage and the inner ring according to the specified quantity and interval. When installing the outer ring, ensure the fitting accuracy between the outer ring, the inner ring, and the rolling elements, and control the clearance within a reasonable range. If the clearance is too large, it will lead to a decrease in rotational accuracy and an increase in vibration; if the clearance is too small, it will increase friction and wear, and may even cause parts to seize. During the assembly process, use special tools and equipment to ensure assembly accuracy.

Pre – tensioning and Adjustment

Some slewing bearings need to be pre – tensioned. By applying a certain axial or radial force, the clearance is eliminated to improve rotational accuracy and rigidity. After pre – tensioning, test and adjust the rotational flexibility, radial and axial run – out, and other performances of the slewing bearing to ensure compliance with design requirements.

Quality Inspection of Slewing Bearings

Appearance Inspection

Inspect the appearance of the slewing bearing to ensure that there are no defects such as cracks, blowholes, and pores on the surface, and that the paint coating is uniform and free from peeling.

Dimensional Accuracy Detection

Use measuring tools to detect the diameters, widths, raceway sizes of the inner and outer rings, as well as the positions and sizes of the mounting holes, etc., to ensure compliance with the tolerance requirements of the design drawings.

Performance Testing

Carry out rotational flexibility tests to check whether the rotation process is smooth and free from jamming; measure radial and axial run – out to evaluate rotational accuracy; conduct loading tests to detect the bearing capacity and fatigue life of the slewing bearing, ensuring reliable performance in actual use.

Prices of Slewing Bearings

There are many factors affecting the prices of slewing bearings. Firstly, raw materials play a significant role. High – quality steel has a high cost, and products made from it have excellent performance and long service life, thus commanding a high price. Secondly, slewing bearings with complex manufacturing processes and high – precision requirements require advanced equipment and strict quality control, which also leads to an increase in price. Moreover, the larger and more special the size and specifications are, the greater the processing difficulty and material consumption, and the higher the price will be.

Suppliers of Slewing Bearings

The products of Ldb bearing company cover a wide range. Whether they are standard – sized or non – standard slewing bearings, the company can produce them with high quality to meet the diverse needs of different customers. Its products are widely used in multiple fields, demonstrating its strong capabilities.

Double-row different diameter ball slewing bearing and double-row ball slewing bearings are two common types of slewing bearings. They have some differences in structure, load-bearing capacity, application scenarios, and other aspects.

What is Double-Row Ball Slewing bearing?

The double-row ball slewing bearing is a mechanical component used to achieve the slewing motion of components. It mainly consists of an inner ring, an outer ring, two rows of steel balls with the same diameter, and a cage. The two rows of steel balls are evenly distributed between the inner and outer rings and jointly bear axial forces, radial forces, and overturning moments. Relative slewing is achieved through the contact and rolling of the steel balls and the raceways. It has a simple structure and is easy to install. It can withstand complex loads to a certain extent and is often used in equipment such as small cranes, aerial work platforms, and small wind turbines that do not require particularly high slewing accuracy but need to bear certain axial and radial forces.

What is Double-row different diameter ball slewing bearing?

The double-row different diameter ball slewing bearing is a slewing bearing device. It is composed of two rows of steel balls with different diameters, inner and outer rings, a cage, and other components. Usually, the diameter of the upper row of steel balls is smaller, mainly bearing axial forces and part of the overturning moment, while the diameter of the lower row of steel balls is larger, mainly bearing radial forces. This structural design can reasonably distribute forces according to different load types and achieve a high load-bearing capacity in a limited space. It has advantages such as good accuracy retention and can adapt to complex working conditions. It is often used in large-scale construction machinery and industrial equipment that require high load-bearing capacity and slewing accuracy, such as large cranes, tunnel boring machines, and large converters.

Structural Characteristics of Slewing bearings

Double-row different diameter ball slewing bearing: The load-bearing rolling elements are composed of two rows of steel balls with different diameters. Generally, the upper row of steel balls with a smaller diameter mainly bears axial forces and part of the overturning moment, and the lower row of steel balls with a larger diameter mainly bears radial forces. This structure can achieve a high load-bearing capacity in a small space by reasonably allocating the diameters and quantities of the steel balls.

Double-Row Ball Slewing bearings: There are two rows of steel balls with the same diameter. The two rows of steel balls are evenly distributed between the inner and outer rings. The two rows of steel balls jointly bear axial forces, radial forces, and overturning moments, and the slewing motion is realized through the contact between the steel balls and the raceways.

Load-Bearing Capacity of Slewing bearings

Double-row different diameter ball slewing bearing: Since steel balls of different diameters are used to bear different types of loads respectively, their load-bearing capacity is highly targeted. For working conditions with large axial forces, radial forces, and overturning moments simultaneously, they can distribute loads more reasonably. Under the same size, they can generally bear a larger overturning moment than double-row ball slewing bearings.

Double-Row Ball Slewing bearings: The two rows of steel balls bear loads evenly and can withstand axial and radial forces well. However, when bearing large overturning moments, due to the same diameter of the steel balls, the load distribution is relatively less reasonable than that of Double-row different diameter ball slewing bearing, and their load-bearing capacity is relatively limited.

Accuracy Retention of Slewing bearings

Double-row different diameter ball slewing bearing: The structural design makes the contact stress distribution between the steel balls and the raceways more uniform when bearing complex loads, which is conducive to reducing the wear and deformation of the raceways. Therefore, it can better maintain slewing accuracy during long-term use.

Double-Row Ball Slewing bearings: They are relatively weak in accuracy retention. Especially when bearing large eccentric loads or impact loads, the wear between the steel balls and the raceways may be aggravated, resulting in a rapid decline in slewing accuracy.

Friction Characteristics of Slewing bearings

Double-row different diameter ball slewing bearing: When the steel balls of different diameters roll, their linear velocities and angular velocities are different, which will generate a certain differential friction. However, through reasonable design and material selection, this differential friction can be controlled within a certain range, and it has little impact on the overall friction characteristics.

Double-Row Ball Slewing bearings: The two rows of steel balls have the same diameter and the same rolling speed. Their friction characteristics are relatively simple, with a small friction resistance, and can provide a relatively smooth slewing motion during low-speed operation.

Installation and Maintenance of Slewing bearings

Double-row different diameter ball slewing bearing: During installation, attention needs to be paid to the installation positions of the upper and lower rows of steel balls and the adjustment of the preload to ensure proper load-bearing and operation. During maintenance, due to the relatively complex structure, it is more difficult to inspect and replace the raceways and steel balls.

Double-Row Ball Slewing bearings: The installation is relatively simple. Only the installation accuracy of the two rows of steel balls and the uniform preload need to be ensured. In terms of maintenance, due to the more intuitive structure, it is relatively easy to inspect and replace components such as steel balls and raceways.

Application Scenarios of Slewing bearings

Double-row different diameter ball slewing bearing: They are often used in large-scale construction machinery that requires high load-bearing capacity and accuracy, such as large cranes and tunnel boring machines, as well as some industrial equipment that needs to operate under complex working conditions, such as port handling equipment and large converters.

Double-Row Ball Slewing bearings: They are suitable for equipment that does not require particularly high slewing accuracy but needs to bear large axial and radial forces, such as small cranes, aerial work platforms, and certain types of wind turbines.

In conclusion, Double-row different diameter ball slewing bearing and double-row ball slewing bearings each have their own characteristics and application ranges. In practical applications, it is necessary to comprehensively consider specific working conditions, equipment requirements, and economic factors to select the appropriate type of slewing bearing to ensure the safe and reliable operation of the equipment and good performance.

Prices of Slewing bearings

There are many factors affecting the price of slewing bearings. Firstly, raw materials. High-quality steel has a high cost and can produce products with excellent performance and long service life, so the price is also high. Secondly, for slewing bearings with complex manufacturing processes and high precision requirements, advanced equipment and strict quality control are required, which will also increase the price accordingly. Moreover, the larger and more special the size and specifications are, the greater the processing difficulty and the amount of materials used, and the higher the price will be.

Suppliers of Slewing bearings

The products of Ldb bearing company cover a wide range. Advanced production and testing equipment are the cornerstone of high-quality products. Ldb bearing company is well aware of this and is equipped with nearly 30 sets of various types of equipment, from 3m CNC drilling and milling machines to quenching machines, providing hardware support for precision processing. At the same time, the company has an experienced design and technical team. With their profound professional knowledge and innovative spirit, they continuously optimize product designs and overcome technical problems.