user01, Author at Slewing Ring Bearings Manufacturers Suppliers Exporters

Luoyang MC Bearing Produce Kinds of Slewing Bearing, Cross Roller Bearing.

Crossed roller bearings play a crucial role in machinery by providing support and reducing friction. For applications that require high speed and need to withstand radial, axial, and moment loads, crossed roller bearings are generally preferred.

The inner and outer rings of crossed roller bearings are minimized in size, especially in ultra-thin structures, making them close to the limits of small dimensions. They also possess high rigidity. As a result, they are widely used in industrial robot joints or rotating parts, rotating worktables in machining centers, rotating parts of mechanical arms, precision rotary worktables, medical instruments, measuring instruments, IC manufacturing devices, and other applications.

The rolling elements in crossed roller bearings are typically arranged in a crossed arrangement using cylindrical or tapered rollers in a single raceway groove. The rollers are separated by brass retainers or engineering plastic isolating blocks, which provide high rotational accuracy, large load-bearing capacity, small overall dimensions, high rotational speed and rigidity. Crossed roller bearings have a wide range of applications and are suitable for industrial robot joints, CNC rotary tables, DD motors, medical equipment, and other fields.

2. Characteristics and Advantages of Crossed Roller Bearings

1. Crossed roller bearings have a sturdy and inseparable inner and outer ring structure that can achieve high rigidity and high precision without being influenced by the surrounding structure. The bearings are suitable for medium to high speeds, and they have isolating blocks between the cylindrical rollers to provide smooth rotation.

2. Crossed roller bearings have the characteristics of high rigidity, accuracy, and easy installation. The mounting holes allow them to be quickly fixed to components. This type of bearing also has isolating blocks between the cylindrical rollers.

3. Crossed roller bearings have a smaller outer diameter and narrower width. They can be selected when high performance and minimal space occupation are required.

Since crossed roller bearings are divided into two parts, the outer or inner ring is fixed together after installing the rollers and retainers. As a result, they are very easy to install. In addition, crossed roller bearings have high precision, with accuracy reaching P4/P2 levels, and smaller dimensions, making the host machine more space-saving.

3. Classification of Crossed Roller Bearings

– SX Type (Inner ring integral, outer ring separable, ultra-thin): Under the same shaft diameter, this type has smaller cross-sectional dimensions compared to the HRB type. Due to its ultra-thin design, it does not have mounting holes on the outer or inner ring, and flanges and support seats are needed for installation. It is suitable for applications requiring rotation of the inner ring.

Type: SX011814,SX011818,SX011820,SX011824,SX011828,SX011832,SX011836,SX011840,SX011848,SX011860,SX011868
,SX011860,SX0118/500

– RU Type (Inner and outer ring integral, with mounting holes): Both the outer and inner rings have mounting holes, so flanges and support seats are not required during installation. Additionally, because the outer and inner rings are both integral structures, installation has almost no impact on performance, ensuring stable rotational accuracy and torque. It is suitable for situations where both the outer and inner rings rotate.

Type:RU124G,RU148G,RU178G,RU228,RU297,RU445,RU228X,RU297X,RU445X,RU228G,RU297G,RU445G

– RAU Type (Inner and outer ring integral, ultra-thin): This type is a compact version of the HRB type, with reduced thickness of the inner and outer rings. It is most suitable for lightweight and compact designs, such as robot and mechanical arm rotating parts. It can be used in situations requiring rotation of both the outer and inner rings.

– RBH Type (Inner and outer ring integral, ultra-thin): It features an ultra-thin design with no mounting holes on the outer or inner ring, so flanges and support seats are required for installation. Due to its integral structure for both the outer and inner rings, installation has no impact on performance, ensuring stable rotational accuracy and torque. It is suitable for situations where both the outer and inner rings rotate, but with requirements for small dimensions.

– RB Type (Inner ring integral, outer ring separable): This type is the basic type of crossed roller bearings. The outer ring is divided into two pieces, while the inner ring is an integral structure. It is most suitable for applications that require high precision in the rotation of the inner ring.

RB4010,RB4510,RB5013,RB6013,RB7013,RB8016,RB9016,RB10016,RB10020,RB11012,RB11015,RB11020,
RB12016,RB12025,RB13015,RB13025,RB14016,RB14025,RB15013,RB15025,RB15030,RB16025,RB17020,RB18025,
RB19025,RB20025,RB20030,RB20035,RB22025,RB24025,RB25025,RB25030,RB25040,RB30025,RB30035,RB30040,
RB35020,RB40035,RB40040,RB45025,RB50025,RB50040,RB50050,RB60040,RB70045,RB80070,RB90070,RB1000110
,RB1250110

Bearing types are varied, in various mechanical equipment in the field of the application of the effect is not the same, different needs constitute a different bearing production conditions. In some aspects of the need to use more and better performance of the quality of bearings in the production and processing of the method used in the process of joining the ultra-precision machining process. The so-called precision machining process refers to the machining accuracy and surface finish higher than the corresponding machining method of various processing technology.

In the rolling bearing manufacturing process, super-fine is the last procedure of bearing ring processing, it is for reducing or eliminating the round deviation left over from grinding processing, repairing the shape error of the groove, refining its surface roughness, improving the surface physical and mechanical properties, reducing the vibration of the bearing, agitation, improving the mission of the bearing, has an important role.

Analyses the 4 stages of the bearing superfinishing process:
(1) strong cutting stage. Workpiece surface rough spikes and oil stone surface contact, contact stress is very large, so that the abrasive grains broken self-sharpening, cutting role is strong.
(2) Normal cutting stage. After a few seconds. Workpiece rough layer is ground, that is, into the normal cutting stage, the surface of the oil stone has no black chips attached, but the cutting still continues.

(3) Grinding transition stage. The abrasive grain from the sharpness is reduced, the abrasive grain edge edge is smoothed, the chip oxides began to embed the oil stone void, the abrasive grain powder blocking the oil stone pore, so that the abrasive grain can only be weak cutting, accompanied by extrusion and the role of the research and polishing, the roughness of the surface of the workpiece will soon be reduced, the surface of the oil stone has a black chip oxides adherence.

(4) Stop cutting and grinding stage. Oil stone and workpiece mutual friction has been very smooth, the contact area increases greatly, the pressure decreases, the abrasive particles have been unable to penetrate the oil film and workpiece contact, when the supporting surface of the oil film pressure and oil stone pressure balance, the oil stone is floating. Between the formation of oil film, which is no longer cutting. This stage is unique to ultra-fine machining.

Super-fine bearings can be reflected in the following three aspects
1, can effectively reduce the degree of corrugation.
In the superfine research process, in order to ensure that the oil stone always acts on the wave peak and not in contact with the wave valley, the oil stone and the workpiece contact arc ≥ the wavelength of the workpiece surface corrugation, in this way, the wave peak of the contact pressure is larger, the peak is excised, so as to reduce the degree of corrugation.
2、Improve the groove shape error of ball bearing raceway.
The super fine grinding can effectively improve the groove shape error of about 30% of the raceway.
3、It can make the surface of the super fine grinding produce compressive stress.
In the process of superfine research, the main cold plastic deformation, so that after superfine research, the surface of the workpiece to form residual compressive stress.
4、It can increase the contact area of the working surface of the collar.
After ultra-precision grinding, the contact support area of the working surface of the collar can be increased from 15% to 40% after grinding to 80% to 95%.

Slewing Bearings Slewing Ring Bearing Turntable Bearings

Introduction:

Slewing bearings are large-scale bearings capable of withstanding comprehensive loads, including axial and radial loads, as well as overturning moments. They are essential transmission components in mechanical systems that require relative rotary motion between two objects while simultaneously bearing axial forces, radial forces, and tilting moments. This article provides an overview of the various types of slewing bearings manufactured and their widespread applications in industries such as shipbuilding, construction machinery, light machinery, metallurgical machinery, medical machinery, and industrial machinery.

Types of Slewing Bearings:

1. Single-row Four-point Contact Ball Slewing Bearing:

This type of slewing bearing is designed with a single row of balls that come into contact with the raceways at four points. It offers excellent load-bearing capacity and enables smooth and precise rotation.

2. Single-row Crossed Roller Slewing Bearing:

Utilizing a single row of crossed cylindrical rollers, this slewing bearing ensures superior load distribution, high rigidity, and reduced friction. It is ideal for applications that require high rotational accuracy and compact design.

3. Three-row Roller Slewing Bearing:

The three-row roller slewing bearing consists of three rows of cylindrical rollers arranged in a staggered manner. With increased load-carrying capacity and enhanced stability, this type of bearing is suitable for heavy-duty applications.

4. Light-duty Series Slewing Bearing:

The light-duty series slewing bearing is designed for applications with lower load requirements. It provides efficient performance in compact spaces and is commonly used in light machinery and equipment.

Applications of Slewing Bearings:

Slewing bearings find extensive application in various industries due to their capability to handle complex loads and facilitate relative rotation. Here are a few notable applications:

1. Shipbuilding Equipment:

Slewing bearings are employed in ship cranes, deck cranes, and other shipbuilding machinery. They enable the rotational movement required for lifting heavy loads and ensure stability and precision.

2. Construction Machinery:

In construction machinery like excavators, tower cranes, and concrete pumps, slewing bearings are crucial for smooth rotation and efficient load distribution, enabling the equipment to perform various operations effortlessly.

3. Light Machinery:

Slewing bearings are widely used in light machinery applications such as automation equipment, robotic arms, and small-scale industrial machines. They provide reliable rotation while maintaining compactness and flexibility.

4. Metallurgical Machinery:

Slewing bearings support the rotational movement in large-scale equipment used in the metallurgical industry, such as continuous casting machines, rolling mills, and furnaces. They withstand heavy loads and ensure smooth operation.

5. Medical Machinery:

Slewing bearings are essential components in medical equipment like imaging systems, surgical tables, and diagnostic devices. They enable precise and smooth movement, contributing to accurate medical procedures.

6. Industrial Machinery:

In various industrial machinery applications, including wind turbines, conveyor systems, and rotary tables, slewing bearings provide stability and reliable performance, enabling the machinery to function smoothly.

Conclusion:

Slewing bearings play a vital role in numerous industries, providing essential rotational motion and load-bearing capabilities. With their ability to handle axial and radial loads, as well as overturning moments, they are indispensable in the modern mechanical industry. As technology continues to advance, the demand for reliable and efficient slewing bearings will only continue to grow, further expanding their applications across various sectors.

Introduction to Luoyang MC Bearing Technology Co., Ltd.

Luoyang MC Bearing Technology Co., Ltd. is a leading manufacturer specializing in the production of slewing bearings, gears, gear shafts, and other machined products. We offer OEM services to meet the specific needs of our customers. Our products are highly regarded by customers worldwide, receiving consistent praise for their quality and performance.

At Luoyang MC Bearing Technology Co., Ltd., we are committed to providing high-quality products that meet the highest industry standards. Our team of skilled professionals ensures that each product is meticulously manufactured to deliver exceptional reliability and durability. We take pride in our ability to offer customized solutions that meet the unique requirements of our clients.
With a focus on innovation and continuous improvement, we strive to stay ahead of industry trends and technological advancements. Our dedication to excellence has established us as a trusted supplier in the global market, with a reputation for delivering superior products that exceed customer expectations.

If you are looking for a reliable partner for your machining needs, look no further than LYMC Bearing Technology Co., Ltd. Contact us today to learn more about our products and services.

Introduction to Slewing Bearings

Slewing bearings, also known as turntable bearings or slewing rings, are large bearings that are designed to support heavy radial, axial, and moment loads in various applications. These specialized bearings are commonly used in machinery that requires rotational movement, such as cranes, excavators, wind turbines, and radar antennas.

Slewing bearings consist of an inner ring, an outer ring, rolling elements (such as balls or rollers), seals, and lubrication. They are designed to accommodate axial, radial, and tilting moment loads simultaneously, making them ideal for applications where heavy loads need to be supported while allowing for smooth rotation.

There are different types of slewing bearings, including single-row ball bearings, double-row ball bearings, cross roller bearings, and three-row roller bearings. Each type has its own unique characteristics and is selected based on the specific requirements of the application.

Slewing bearings play a critical role in ensuring the smooth and efficient operation of rotating machinery. They are engineered to provide high load-carrying capacity, precise rotation, and long service life. With their robust construction and reliable performance, slewing bearings are essential components in a wide range of industrial and construction equipment.

In summary, slewing bearings are essential components that enable machinery to rotate smoothly and support heavy loads. Their versatility, durability, and high load-carrying capacity make them indispensable in a variety of applications across various industries.

Компания Luoyang MC Bearing Co., Ltd., специализируется на разработке, производстве и продаже опорно-поворотных подшипников. Мы полностью понимаем важность высококачественных опорно-поворотных подшипников для обеспечения стабильной работы оборудования в таких областях, как строительная техника, подъемно-транспортное оборудование, медицинские приборы и многое другое. С момента своего основания мы стремимся к технологическим инновациям и улучшению качества продукции, стремясь предоставить клиентам из всех отраслей промышленности услуги и поддержку самого высокого качества.

Luoyang MC Bearing Co., Ltd. может похвастаться передовым производственным оборудованием и строгой системой контроля качества, гарантируя, что каждый продукт соответствует или даже превосходит ожидания наших клиентов. Наша линейка продукции включает в себя различные типы и размеры опорно-поворотных подшипников, включая, но не ограничиваясь однорядными шариковыми, двухрядными шариковыми, поперечными цилиндрическими роликовыми, трехрядными роликовыми и т.д., способными широко использоваться в различных рабочих условиях и требованиях.

Стоит отметить, что мы понимаем, что стандартные продукты не могут полностью удовлетворить уникальные потребности всех клиентов, поэтому мы предлагаем индивидуальные услуги. Основываясь на ваших конкретных требованиях, мы можем разработать и изготовить поворотные подшипники, которые идеально подойдут для вашего оборудования.

Выбрав компанию Luoyang MCBearing Co., Ltd., вы получите следующие преимущества:

Преимущество продукции: Использование высококачественного сырья, точная обработка и тщательное тестирование обеспечивают стабильность и надежность продукции.

Переведено с помощью www.DeepL.com/Translator (бесплатная версия)

Luoyang MC Bearing Co., Ltd., are a company specialized in the design, production, and sales of slewing bearings. We fully understand the importance of high-quality slewing bearings in ensuring the stable operation of equipment in fields such as construction machinery, lifting and transport equipment, medical devices, and more. Since our establishment, we have been committed to technological innovation and improving product quality, aiming to provide customers from all industries with the highest quality service and support.

Luoyang MC Bearing Co., Ltd. boasts advanced production equipment and a strict quality control system, ensuring that each product meets or even exceeds our customers’ expectations. Our product line includes a variety of types and sizes of slewing bearings, including but not limited to single-row ball type, double-row ball type, cross cylindrical roller type, three-row roller type, etc., capable of being widely used under various working conditions and demands.

It is worth mentioning that we are aware standard products cannot fully meet all customers’ unique needs; therefore, we offer customized services. Based on your specific requirements, we can design and manufacture slewing bearing products that perfectly fit your equipment needs.

Choosing Luoyang MCBearing Co., Ltd., you will enjoy the following advantages:

Product Advantage: Using high-quality raw materials, precision machining, and rigorous testing to ensure stable and reliable product performance.
Flexible Customization: Providing personalized customization based on customer needs, whether it’s size, model, or performance requirements, we can achieve precise matching.
Technical Support: Possessing an experienced technical team, offering professional selection guidance and technical consultations to ensure the product you choose is most suitable for your application environment.
After-sales Guarantee: A complete after-sales service system, providing quick and effective solutions, making your purchase worry-free.

We look forward to cooperating with you and believe that Luoyang MC Bearing Co., Ltd. can become your trustworthy long-term partner. If you have any questions about our products or services, please feel free to contact us for further information. Let’s work together for a brighter future!

Ball bearing slewing ring

Four-point contact ball bearings, double-row ball bearings, and double-row different diameter ball bearings are all typical point contacts. In the case of rotation, it can be understood as two concentric circles or four concentric circles. Ball bearing slewing ring, Actually The precision of processing is very demanding. The advantages are flexibility, fatigue resistance, convenient maintenance, quick installation, easy accuracy, long life, but the stability is slightly inferior to the cross roller and the three-row roller in the long run.

Ball bearings, mainly cross-roller bearings and three-row roller structures, Ball bearing slewing ring , line contact, in the state of motion, can be understood as surface contact, low speed and heavy load, high reliability and stability, but the speed and flexibility are obviously not as good as four points Contact the ball bearing.

The working conditions need to decide everything. In a general sense, four-point ball bearing can handle 80% of the working conditions. Special customization requires special design.

Rothe erde ball bearing slewing ring

1. The scientific name of the slewing bearing is the slewing ring. Before the slewing ring is selected, the operating environment and working conditions must be clarified.

2. Determine the maximum load of the slewing bearing. This load must include both the dynamic load and the static load applied to the slewing ring. The load applied to the ring should be converted into an equivalent load acting on the center of the slewing ring. Some things that must be noted:

· All external forces acting on the slewing ring and gear, not only the rated load or working load, but also the load that may occur suddenly when the equipment is stationary, such as the effect of strong wind on large buildings, etc.

· The load that may be generated in the case of overload or test

· Loads generated during installation and removal

· The weight of all structures supported by the slewing ring

· The sum of all possible loads. For example, a crane has various changes in load and working radius during normal use and overload test.

3. Multiply the calculated load by an appropriate safety factor.

4. Ball bearing slewing ring If you need a complete gear, you need to determine the load that the gear needs to bear. The calculation method is the same as that of the slewing bearing load, and all possible situations should be considered; to give a few examples, these situations include working, static, tilting, and overload testing. Another thing to pay attention to is the type of load in each case.

5. Ball bearing slewing ring After determining the installation layout, you need to consider the location of the large and small gears, the installation of the slewing ring and the fastening bolts, and the follow-up maintenance issues.

6. Ball bearing slewing ring Refer to the “Product Overview & Selection Guide” in the Wanda Slewing Ring Operation Manual to select the slewing ring series required for each location.

7. By comparing the previously calculated load and safety factor of the slewing ring with the load-bearing characteristic curve of the slewing ring, we can make a preliminary selection of the slewing ring. Be sure to ensure that all load combinations are below the load-bearing characteristic curve. In many cases, we now have several slewing bearings to choose from, all of which can meet the load requirements.

8. If possible, check the gear load capacity of the selected slewing ring.

9. Confirm that the arrangement of fixing bolts, fixing plates and joints are suitable for installation.

2. Selection elements of slewing bearings

Slewing bearings ,Ball bearing slewing ring have unique load-bearing characteristics and are usually used in hoisting machinery, excavators, turrets, wind turbines, telescopes and tank turrets. Ball bearing slewing ring Through the improvement of machining methods and the upgrading of design, the slewing bearing at this stage can be used in smaller, more complex and more precise occasions.

The correct selection of slewing bearings depends on the requirements of load, stiffness, speed, size and rotational flexibility. Customers and manufacturers jointly select the design goals and the applicability of the bearing, which helps to optimize the performance of the system under the premise of the lowest cost and guaranteed trouble-free operation. Usually the load capacity is the decisive factor in choosing the bearing section size and diameter, but other parameters determine which bearing type is the best.

1. In general, double row four-point contact ball bearings are required for larger torque requirements.

2. Generally, roller bearings are required to increase rigidity.

3. The maximum load carrying capacity requires the use of cross rollers (two-row or three-row roller bearings)

For occasions requiring increased rigidity and load-bearing, large-size bearings are required, but for occasions with sensitivity requirements such as robots and manipulators, small-size bearings are required. The slewing bearing with a smaller inner diameter size makes the structure of the mounting component more compact and the total weight is reduced.

Ball bearing turntables and slewing rings

1. Ball bearing slewing ring can Dimensions, especially the stop, step size, relative position of the lubrication hole
2. Gear parameters, core key parameters
3. Quenching, channeling, and tooth roots
4. Gear center diameter
5. Mounting hole size, category, center diameter, wire hole size and type, key parameters
6. Original accuracy
7. Upgrade and promotion of installation conditions.

Ball bearing supported slewing ring

Design and selection and consider the core parameters of the large slewing bearing selection.

After fully considering the working conditions, the overall dimensions of the large bearing, installation dimensions, load capacity, speed, lubrication, protective measures, and design life can be selected so as to complement each other. .

1. First, determine the overall dimensions and installation dimensions of the large bearing.

This is the first issue to be considered. How many pots are there, and how many meters there are.

This determines the structure of the bearing.

2. Load, which needs to be calculated, including axial load, radial load, overturning moment, and impact load.

3. Rotation speed, the rotation speed of the slewing bearing is not high, more than 15Rpm, you need to consider the segmented cage, the overall cage.

4. Installation methods, such as horizontal installation, vertical installation, inclined installation, and multi-directional movement installation, the cage needs to be fully designed. 5. The lubrication method is convenient, fast and beneficial.

6. Design and utilization of ash guard

7. Accuracy standards.

8. Fully consider the advantages of each structure of the bearing. Four-point ball bearings are flexible and resistant to permanent fatigue. Double-row ball bearings have the above advantages while increasing the load. Crossed roller, anti-permanent deformation, strong rigidity, crossed tapered roller bearing, high precision, three-row roller bearing load is the highest under the same size.

What is ball bearing ring?

If the basic rotation is achieved, the load is not high, and the overturning moment is not large, the four-point ball bearing is sufficient.

If good rotation performance is required, and the load is more than 10 tons, double volleyball is the best choice.

To emphasize the rotation accuracy, consider the crossed roller bearing, of which the accuracy of the tapered roller bearing ,Ball bearing slewing ring is the most appropriate.

Selection and Application of Bearings for Slewing Bearings of Rotary Turntable

Three-row cylindrical rolle r bearings are the ultimate design goal, and corresponding changes are made in the size and material of the rollers to obtain different force enhancements.

Of course, the cost has also increased. According to different working conditions, the material of the bearing, the cage and the sealing system have targeted designs, divided into categories to facilitate the better and stronger operation of the equipment. This is where the strength of Luoyang Bearing.

What are the benefits of using ball bearing?

Slewing bearings ,Ball bearing slewing ring and double-row ball bearings have not been well-known for a long time.

First, many devices mostly use four-point contact ball bearings, but for double-row ball bearings, they ignore or adopt other structures. In fact, analyze the characteristics of double-row ball bearings as follows:

1. Realize good rotation performance

2. Anti-permanent fatigue

3. The load is relatively in the middle, that is, between the four-point kick and the three-row roller bearing, such as 15 to 40 tons cranes, crane cranes, cement pump trucks, etc.

4. Maintenance Convenient

5. Long service life.

Three-row roller bearings, considering the ultimate choice of heavy load and overturning moment, the technical characteristics are as follows:

1. Load more than 100 tons

2. Impact load, partial load and heavy load and complex force

3. Low speed

4. Lubrication system is relatively Complex 5. High cost

What are the ball bearings where are they used?

https://www.youtube.com/watch?v=Dqwgxx1_9ac

What are the general selection steps for slewing bearings ， Ball bearing slewing ring?

1. The scientific name of slewing bearings is slewing ring.

Before slewing ring selection, the operating environment and working conditions must be clarified. 2. Determine the maximum load of the slewing bearing.

This load must include both the dynamic load and the static load applied to the slewing ring. The load applied to the ring should be converted into an equivalent load acting on the center of the slewing ring.

Some things to pay attention to: · All the external forces acting on the slewing ring and gears are not only the rated load or working load, but also the load that may occur suddenly when the equipment is stationary, such as the effect of strong wind on large buildings, etc. ·

In The load that may be generated in the case of overload or test, the load generated during installation and disassembly, the weight of all structures supported by the slewing ring, and the sum of all the possible loads.

For example, a crane has multiple changes in load and working radius during normal use and overload test.

3. Multiply the calculated load by an appropriate safety factor.

4. If you need a complete gear, you need to determine the load that the gear needs to bear. The calculation method is the same as that of the slewing bearing load, and all possible situations should be considered; to give a few examples, these situations include working, static, tilting, and overload testing. Another thing to pay attention to is the type of load in each case.

5. After determining the installation layout, you need to consider the location of the large and small gears, the installation of the slewing ring and the fastening bolts, and the follow-up maintenance issues.

6. Refer to the “Product Overview & Selection Guide” in the Wanda Slewing Ring Operation Manual to select the slewing ring series required for each location.

Be sure to ensure that all load combinations are below the load-bearing characteristic curve. In many cases, we now have several slewing bearings to choose from, all of which can meet the load requirements.

8. If possible, check the gear load capacity of the selected slewing ring.

9. Confirm that the arrangement of fixing bolts, fixing plates and joints are suitable for installation.

2. Selection elements of turntable bearings Turntable bearings have unique load-bearing characteristics, and are usually used in hoisting machinery, excavators, turntables, wind generators, telescopes and tank turrets.

Through the improvement of machining methods and the upgrading of design, the slewing bearing at this stage can be used in smaller, more complex and more precise occasions.

1. In general, double row four-point contact ball bearings are required for larger torque requirements.

2. Generally, roller bearings are required to increase rigidity.

3. The maximum load carrying capacity requires the use of crossed rollers (two-row or three-row roller bearings).

For occasions that require increased rigidity and load-bearing, large-size bearings are required, but for occasions with sensitivity requirements such as robots and operating devices, then Need to use small size bearings.

The slewing bearing with a smaller inner diameter size makes the structure of the mounting component more compact and the total weight is reduced. At the same time, for the occasions with higher speed and small structural deformation, it also reduces the moment of inertia.

How does ball bearings reduce friction?

1. Ball bearing slewing ring The accuracy of the transmission movement. The angle error of the gear in one revolution is required to be limited within a certain range, so that the gear pair transmission ratio changes little to ensure the accuracy of the transmission movement.

2. The smoothness of the transmission movement. Ball bearing slewing ring It is required that the rotation angle error within the range of one tooth of the gear is limited to a certain range, so that the instantaneous transmission ratio of the gear pair changes little, so as to ensure the smoothness of the transmission and reduce vibration, impact and noise.

3. Uniformity of load distribution. It is required that the working tooth surface in the transmission is in good contact to ensure uniform load distribution, otherwise it will cause the tooth surface stress concentration, premature wear and reduce the service life.

4. The rationality of the transmission backlash. It is required to leave a certain amount of backlash between the non-working tooth surfaces of the meshing gear teeth in order to store the lubricating oil, compensate for the elastic deformation and thermal deformation, and the manufacturing and installation errors of the gear.

What is the difference between ball bearing and roller bearing?

The accuracy and reliability of the three-row roller bearing crossed roller bearing and the four-point ball bearing are high? In fact, there is only more suitable, there is no difference between high and low.

From the technological point of view, Ball bearing slewing ring , three-row roller bearings are flat raceways.

Relatively speaking, the rotation accuracy is easier to achieve and meet. Taking the limit accuracy of 0.015 as an example, this end face runout is difficult to achieve, especially for large-diameter slewing bearings. . The advantage is that three-row roller bearings have the advantages of heavy-duty and high-precision bearings, and are widely used in shield machine bearings, ladle bearings and other high-precision turntables.

The cross-roller structure has special forces, uniform axial and radial forces, good rigidity, and deformation resistance. It can be said that it is leading in the field of bucket wheel bearings and stacker-reclaimer bearings.

1797/3230 and 1797/2635, as well as the smaller model 1797/2500, can dominate the entire field of bucket turbines. In power plants, bucket turbines and turntable bearings in thermal power plants are in the position of big names in the world. Generally speaking, it is appropriate to achieve good high rigidity and preload. Disadvantages, low speed limit, inflexibility, there will be ball crashing sound above 6RPM per minute.

The four-point ball slewing bearing has more than flexibility and controllable precision. The key is to cooperate with the integral cage, copper cage, steel cage, and PTFE cage. It is fully qualified for different equipment fields. It is definitely the top beam, the vanguard and Sniper. It is widely used in winding machine bearings, CT machine bearings, bottle blowing machine bearings, filling machine bearings and injection molding machine bearings. The characteristic is that it can adapt to high speed.

Do ball bearings need a cage?

Regardless of whether the slewing bearing is a ball bearing or a ball bearing,Ball bearing slewing ring the spacer and the cage are indispensable.

Ball bearing slewing ring The role of the cage:
1. Reduce the friction between the rolling elements
2. Coordinate, distribute and guide the direction and trajectory of the rolling body
3. Standardize the force balance of rolling elements
4. On the basis of bearing forces, especially vertical, inclined and multi-directional forces, the application of integral cages and segmented cages is very necessary to prevent rolling bodies from squeezing during gravity and movement. Hard friction
5. Among high-speed bearings, the integral cage is the first factor in the design
6. In order to reduce friction, noise and wear, the application of copper cage, PTFE cage and PA66 cage is very critical.

Slewing ring Bearing – Port Crane Slewing Bearing

Ball bearing slewing ring

1. Material
2. Heat treatment
3. Clearance, runout, tooth jump
4. Comprehensive index, roughness, tooth grinding, depth of hardness layer, flaw detection
5. Reference life value of similar bearing operation

Ball bearing slewing ring

The quality inspection of slewing ring bearings can be divided into axial clearance and radial clearance according to different inspection methods. Radial clearance is the basis for the assembly of the inner group, outer ring and rolling element of the bearing, and the quality is carried out in accordance with national standards. Important items for testing.

From the perspective of bearing application, the clearance is an important indicator for testing. Whether the bearing can obtain a more satisfactory performance, which largely determines its radial clearance.

The specific testing is as follows: the high-frequency quenching hardness of the bearing surface should not be less than 55HRC, the depth of the hardened layer should not be less than 4mm, and the width of the soft belt should not be less than 50mm.Ball bearing slewing ring, The entire processing process should be made according to customer needs.

Support bearings have certain requirements for quenching time and temperature for tempering. Under normal circumstances, they need to be quenched at a temperature of 200 degrees to ensure that all stresses disappear.

In addition, the most important thing is the grinding process. It is necessary to select a suitable grinding wheel to complete the grinding and strictly control the linear speed to avoid raceway burns.

Ball bearing slewing ring ，Then for fine grinding, you need to choose a 46° or 60° resin wheel for grinding. The amount of grinding cannot exceed that of rough grinding, and the finish must meet the requirements of the specified grade. For supporting bearings containing gears, after the grinding process, the gear hobbing process is required. The entire process is very strict, and the accuracy must exceed eight levels.

slew bearing design

Slew bearing design:

The slew bearing design, selection, customization, and reference factors and technical standards of slewing bearings for slewing bearings are theoretically obscure and difficult to operate. Even if the algorithm of the kimono specification, the actual working conditions are very different, it may not be reasonable.

The forces on the slewing bearing and the slewing bearing, such as axial load, radial load and overturning moment, are not necessarily indispensable technical factors, such as the force of the main bearing of the shield machine and the main bearing of the TBM.

Beyond thrust (which can reach 8000-12000 tons), because it is almost on the same forward horizontal surface, the overturning moment can be regarded as 0.

slew bearing design

Slewing ring bearing design：

1. The operating direction of the equipment is generally horizontal and axial rotation, tilt angle rotation, such as pelletizing machine, vertical direction is radial rotation, such as spiral CT machine, shield machine, TBM, etc.
2. Analysis of equipment working conditions: force distribution, axial, radial, overturning moment, thrust, eccentric load, impact force
3. The rotation speed of the device
4. The relationship between speed and heavy load, emphasizing equivalence or deviation
5. After selecting the structure of the slewing bearing, the economic factor is second
Next, as mentioned in this article, if you choose a four-point contact ball bearing, focus on the conditions of moderate speed and low heavy load, such as excavators, tower cranes, truck cranes, tire cranes and other equipment. Economic considerations are very obvious. If heavy load is considered, it is selected in three-row roller bearings, but the cost is appropriately high, and in terms of reliability and stability, there are more arrangements in terms of bearing material, heat treatment, machining accuracy, and process level.

Slewing ring bearing with external gear:

1. In order to improve the wear resistance of slewing bearings, tooth surface quenching is necessary, but considering the bearing load, you need to be cautious. 42CrMo material generally does not need quenching at all.
2. The rotation performance of the slewing bearing requires high levelness of the installation base surface and the installation base, otherwise, the deviation of the center of gravity will cause uneven force
3. The gear and pinion of the slewing bearing must mesh well
4. The main consideration for choosing 42CRMO instead of 50MN is that 42CrMo has a combination of flexibility and hardness, while 50MN has strong rigidity but fragility.
5. The slewing bearing and slewing bearing are frequently overhauled and the lubrication system is maintained to maintain normal lubricating oil, as a key measure for sealing protection.

Slew bearing tolerance:

First of all, it needs to be clear that whether the standard for slewing bearings is JB/T10471 or JB/T2300 for slewing bearings, in fact, to sum up, most of the applications of slewing bearings belong to the bulky field of heavy industry, and the accuracy of gear meshing Sexual requirements are not high, generally grade 10 teeth.

After the tooth surface is quenched, the accuracy level is lost to level 12. From the application, it does not affect the meshing. Therefore, emphasizing the high precision of the gear is a fuss and fault, and it is of no practical significance. It is just a waste of labor costs. .

Of course, when it comes to the accuracy of the slewing bearing, it is generally obtained through tooth grinding. Several key data of measuring gear are as follows.

Common normal length, common normal deviation, tooth jump, fixed string tooth height and tooth thickness, as for the tooth profile, tooth direction and tooth pitch, you need to use professional instruments to measure.

Regarding gear accuracy measurement, we are currently able to measure items such as common normal dimensional tolerance, common normal variation deviation, fixed chord tooth height and tooth thickness. For other gear accuracy requirements, such as tooth profile, tooth direction, tooth pitch, etc., currently unconditionally measured. In the case of tooth grinding, it is generally within a reasonable range.

Internal gear slewing bearing:

Internal gear bearing and external gear bearing: The gear accuracy ultimately determines the transmission accuracy of the slewing bearing rotation:
why would you say so? It should be known that the rotation accuracy of the slewing bearing includes end face runout, radial runout, and gear runout.However, when the slewing bearing rotates, the final output accuracy is concentrated on the gear accuracy, so the gear accuracy has the following parameters:

1. The number of teeth across the gear and the length of the common normal
2. The tooth jump of the gear, the highest point
3. The verticality of the gear
4. Tooth direction, tooth profile and tooth thickness
5. Quenching hardness of tooth surface
6. The hardness of the tooth surface
7. Gear shaping grade, according to gear hobbing grade 9-10, gear shaping grade 7-8
8. Finally, the roughness of the tooth surface is required. If the gear is shaped, it should be around Ra1.6, the hobbing should be around Ra3.2, and the grinding should be around Ra0.8.
9. The relationship between quenching and tempering hardness of gear and quenching hardness
10. The highest point of the final rotation accuracy of the gear should be the green paint standard.

Slew bearing design and selection:

1. Choose a good structure, this is the most basic working condition
2. Determine the material, because it affects the life and heat treatment process
3. Accuracy standards and key indicators, such as clearance, runout, rotation accuracy
4. The installation method directly determines the operation mode of the cage
5. Sealing protection
6. Lubrication method
7. Gear meshing
8. Anti-corrosion treatment
9. Utilization of ash shield
10. Matching size, stop, step size and positioning size.

The slewing bearing with gear ring has the function of transmitting power and simplifying the main machine mechanism. Among them, the internal gear slewing bearing has a compact structure, low contact stress during transmission, low wear, grease, easy to maintain lubrication for a long time, good dust-proof effect, and the protection requirements for the meshing part are relatively better than the meshing effect of external teeth.

With external gear structure slewing bearing, the method of tooth profile processing and detection is quick and convenient. High manufacturing precision. It is easy to obtain the highest precision of grinding teeth, and can maximize the use of supporting space. And the tooth profile has a large pitch circle diameter. A larger transmission ratio can be obtained.

At the same time, the circumferential force and torque of the pinion can also be reduced, thereby saving efficiency. Of course, in terms of manufacturing costs, most of the internal teeth are shaped gears, which requires long working hours, and most of the external teeth are gear hobbing, and the speed is fast. Therefore, internal gear bearings are generally more expensive than external gears.

Slewing ring bearing manufacturers:

Slew Bearing Design and selection are consider the core parameters of the large slewing bearing slewing ring selection. After fully considering the working conditions, the overall dimensions, installation dimensions, load capacity, speed, lubrication, protection measures, and slew bearing design life of the large bearing can be selected. .

1. First, determine the overall dimensions and installation dimensions of the large bearing. This is the first issue to be considered. How many pots are there, and how many meters there are. This determines the structure of the bearing.
2. Load, which needs to be calculated, including axial load, radial load, overturning moment, and impact load.
3. Rotation speed, the rotation speed of the slewing bearing is not high, more than 15Rpm, you need to consider the segmented cage, the overall cage.
4. Installation methods, such as horizontal installation, vertical installation, inclined installation, and multi-directional movement installation, the cage needs to be fully designed.
5. The lubrication method is convenient, fast and beneficial.
6. Design and utilization of ash guard
7. Accuracy standards.
8. Fully consider the advantages of each structure of the bearing. Four-point ball bearings are flexible and resistant to permanent fatigue. Double-row ball bearings have the above advantages while increasing the load. Crossed roller, anti-permanent deformation, strong rigidity, crossed tapered roller bearing, high precision, three-row roller bearing load is the highest under the same size.

Slewing ring bearing calculation:

Calculation method of static reference load Fa’ and M’
Single-row four-point contact ball
The selection and calculation of single-row four-point contact ball slewing ring are carried out according to the load angle of 45° and 60° respectively.
I, a=45°　, a=60°
Fa’=(1.225•Fa+2.676•Fr)•fs　Fa’=(Fa+5.046•Fr)•fs
M’＝1.225•M•fs　M’＝M•fS
Then find the above two points on the graph, one of which is below the curve.
Single row cross roller type
Fa’=(Fa+2.05•Fr)•fs
M’＝M•fs
Double-row reducing ball
For the calculation of the selection of the double-row reducing ball slewing ring, when Fr ≤ 10% Fa, Fr is ignored. When Fr>10%Fa, the pressure angle change in the raceway must be considered. Please contact us for its calculation.
Fa’=Fa•fs
M’＝M•fs
Three-row roller type
When selecting the three-row roller slewing ring, only the effects of axial raceway load and overturning moment are calculated.
Fa’=Fa•fs
M’＝M•fs

Slewing Ring Bearing

Slew rings have a few different names, including turntable bearings, slewing rings and slewing bearings. The purpose of slewing rings is to enable rotational motion between different components in a system (Ritbearing). That motion can be radial, axial or tilting.

2.How do I choose a slewing ring bearing?

Slewing ring bearing are typically used in applications where their ability to transmit relatively high loads is of primary importance. However, there are other potential application requirements that can have a significant impact in the selection of an appropriate slewing bearing, and they should be thoroughly considered during the selection process. These considerations include, among others, rotational speed, protection from contamination, accuracy, frictional resistance, and temperature range of the operating environment.

Kaydon Bearings - external gear slewing ring bearing

Steps for selecting a slewing bearing

This white paper outlines nine steps to follow in order to select the appropriate slewing bearing for a given application. Note that these guidelines apply to ‘normal slewing applications,’ which are defined as those that meet the following conditions:

Vertical axis of rotation
Compressive thrust and moment loading (see Figure 1)
Radial load less than 10% of the thrust load
Oscillation or intermittent rotation with occasional pitch line velocity (limited time for speeds to 500fpm for single row bearings and 300fpm for multi-row bearings)
Operating temperature within -20°F to +140°F (-29°C to +60°C)
Mounting surfaces reinforced and machined to bearing manufacturer’s criteria
Proper installation (see the Kaydon white paper ‘How mounting can optimize slewing bearing performance‘ for more information)
Periodic lubrication
Periodic confirmation of specified bolt tension

If yours is not a ‘normal application,’ consultation with your bearing supplier during the early stages of a project can help assure success.

Kaydon Bearings - slewing bearing selection, simplified - Compressive thrust and moment loading
Figure 1
Compressive thrust and moment loading

Step 1

Determine what is required of your application in terms of load, speed, accuracy, torque, environment, coatings, mounting arrangements, and lubrication. LYMC’s Specification Data Sheet lists the more common requirements; download the data sheet, use the online form .Early consultation with your bearing manufacturer will help assure selection of a bearing that provides the necessary features to meet your requirements.

Step 2

Determine all maximum bearing loads, being sure to include all dynamic and static loads imposed on the bearing.

Consider all applied forces to the bearing and gear—not only at rated and working loads, but also loads imposed during:

extreme weather conditions
impact or testing
assembly or disassembly
all other situations

These loads in turn must be simplified into the forces acting at the bearing’s center. See Figure 2.

Kaydon Bearings - slewing bearing selection, simplified - Resultant forces acting on or about a bearing
Figure 2
Resultant forces acting on or about a bearing

Step 3

Multiply the resultant bearing forces by the applicable service factor (SF). See Table 1 for the service factors of common applications, or use the LYMC Bearings slewing ring bearing selector tool.

Application service factors are based on a number of considerations. The primary considerations are the frequency of use at higher vs. normal loads and potential for extreme or impact loads. These factors may be superseded by customer specification, finite element analysis (FEA), or regulations by certifying authorities.

If the intended equipment and application do not appear in Table 1, select a comparable application for initial sizing. If unsure, consult with the bearing manufacturer.

Table 1—Service factors
Application	Service factor (SF)
Aerial lift devices
Aerial baskets, platforms, ladders, etc.	1.00
Conveyors	1.00
Cranes
Mobile (loads limited by machine stability)
Normal construction duty (tire mounted)	1.00
Normal construction duty (crawler mounted)	1.10
Production duty such as scrap and ship yards	1.25
Forestry handling (logging)	1.50
Stacker cranes (must include dynamic forces as loads)	1.25
Pedestal or tower (loads not limited by machine stability)
Loads continually monitored by safe load device	1.25
Applications with risk of sudden impact load application	1.50
Excavators
Load limited by tipping	1.25
Load limited by hydraulic pressure relief	1.50
Index and turnstile tables* (include any shock loads for evaluation)
Occasional use with intermittent rotation	1.00
Frequent use with intermittent rotation	1.25
Frequent use with intermittent rotation and impact loads	1.50
Industrial manipulators and robots
Occasional service	1.00
Frequent service	1.25
Steering gear (must include dynamic and shock loads due to transit forces)
Pneumatic tires	1.25
Solid tires	1.50

* Excludes coilers/uncoilers

Step 4

If an integral gear is desired, determine the required gear capacity. As with bearing loads, consider all conditions that would generate potential gear loads. Examples include dynamic loads while working vs static loads; loads on incline; and overload testing. Consider also the duty cycle at each of these conditions.

Kaydon Bearings - internal gear slewing ring bearing

Step 5

Determine the preferred mounting arrangement, considering the pinion and gear location. Consider the requirements for installation and continued maintenance of the bearing and retaining bolts. Slewing bearings can be designed to suit a number of mounting arrangements.

See Figures 3 through 6 for examples of basic arrangements available from LYMC Bearings, which can be varied to suit the requirements of a specific application. The mounting structures shown are intended to be illustrative only.

Kaydon Bearings - slewing bearing selection, simplified - Pinion is attached to outer ring support and the upper structure is supported by the inner ring. A shroud over the outer seal and bolts prevents contamination under extreme conditions. Through bolt arrangement shown.
Figure 3
Pinion is attached to outer ring support and the upper structure is supported by the inner ring. A shroud over the outer seal and bolts prevents contamination under extreme conditions. Through bolt arrangement shown.

Kaydon Bearings - slewing bearing selection, simplified - Inner ring with through bolts supports the upper structure with pinion. An external shroud protects the gear teeth on the outer ring, supported by the lower structure with threaded bolts.
Figure 4
Inner ring with through bolts supports the upper structure with pinion. An external shroud protects the gear teeth on the outer ring, supported by the lower structure with threaded bolts.

Kaydon Bearings - slewing bearing selection, simplified - Pinion is attached to upper structure supported by outer ring. Location of gear on inner ring can provide protection from harsh external conditions. Threaded bolt arrangement shown.
Figure 5
Pinion is attached to upper structure supported by outer ring. Location of gear on inner ring can provide protection from harsh external conditions. Threaded bolt arrangement shown.

Kaydon Bearings - slewing bearing selection, simplified - Pinion is attached to lower structure supporting inner ring. Geared outer race supports upper structure. Through bolts used on inner ring and threaded bolts on outer ring.
Figure 6
Pinion is attached to lower structure supporting inner ring. Geared outer race supports upper structure. Through bolts used on inner ring and threaded bolts on outer ring.

Step 6

Review available bearing styles and cross-sections. Figure 7 features a few of the slewing bearing designs available from LYMC. LYMC’s slewing ring bearing Catalog 390 provides detailed information about the design features, sizes, and ratings of each bearing series.

Figure 7
Cross-sections of available Kaydon slewing bearings

Kaydon Bearings - slewing bearing selection, simplified - RK series slewing ring bearings
RK series

Kaydon Bearings - slewing bearing selection, simplified - MT series slewing ring bearings
MT series

Kaydon Bearings - slewing bearing selection, simplified - XR series slewing ring bearings
XR series

Kaydon Bearings - slewing bearing selection, simplified - TR series slewing ring bearings
TR series

Step 7

Make a preliminary selection by comparing the resultant operating bearing forces, including service factor (SF), to the bearing’s rating curve.

In order for a bearing to be appropriate for a given application, all required resultant force combinations should fall below the curve.

Assure all extreme load conditions fall below the bearing’s rating curve. If extreme load condition is static and only occurs several times during bearing’s service life do not include the service factor. Otherwise, include the service factor.

The maximum thrust rating of a bearing should exceed 3 times the maximum operating thrust force on the bearing, regardless of the moment force at that condition. This criteria is due to concern for rigidity of the supporting structure and ability to properly distribute the load around the bearing’s diameter. If the bearing desired does not meet this criteria, contact the bearing manufacturer for assistance.

Load curves for LYMC slewing ring bearings, such as the example in Figure 8, can be found using the LYMC slewing bearing selector or Catalog 390. Several bearings may meet the required load ratings.

Kaydon Bearings - slewing bearing selection, simplified - Maximum rating curves for several bearing types
Figure 8
Maximum rating curves for several bearing types

Step 8

Check the gear size, quality, and rating for suitability. View a sample gear rating chart, from LYMC Bearings.

The chart’s gear tooth rating (Fz) indicates the maximum allowable tangential gear tooth load for normal slewing ring bearing applications. Refer to page 21 of LYMC Catalog 390 for more details.

Step 9

Finally, confirm that the bearing you select meets all of your design requirements. The LYMC slewing bearing selector can help with obtaining preliminary data. Consult with bearing and other component manufacturers, and submit a completed specification data sheet to the bearing manufacturer to confirm proper bearing selection. Ultimately, the responsibility for choosing the appropriate bearing rests with the equipment designer.

Conclusion

Like all bearings, slewing ring bearings serve as a connection between two adjacent structures, allowing rotation and transmission of load between them. In addition, a slewing bearing typically includes features for simple and quick attachment to those adjacent structures, and a feature to facilitate the mechanical rotation of one ring and its adjoining structure relative to the other.

Slewing ring bearings have traditionally been thought of as large-diameter, heavy section, low-precision bearings. But today they are also readily available with bore sizes as small as 50 mm, making them ideal for robotics, radar pedestals, and other precision applications.

The use of a single large-diameter bearing makes it possible for wiring and plumbing to run through the bore of the bearing. This can simplify overall design, help protect components, and improve appearance.

Selecting the right slewing ring bearing is key. With attention to all relevant design requirements and with help from the bearing manufacturer, a slewing bearing can be specified that meets or exceeds all application requirements.