Dominating the robotics/angular contact ball bearings market is the SKF Double Row Angular Contact Ball Bearings that showcase exceptional performance in harsh industrial scenarios without compromising reliability. The specific load capacity of these bearings is incredible, as they support axial and radial loads simultaneously. The innovative designs, coupled with breakthroughs in manufacturing technology, result in longer service life, lowered requirements for maintenance, and higher output in the industry’s manufacturing processes. This article will discuss the significant features, advantages, and application fields of those highly efficient bearings to explain the reasons for their wide use in modern engineering problems. The latest imperatives in dynamic machine design or in extending the life of critical components can be achieved through double-row angular contact bearings.
What are the key features of SKF double-row angular contact ball bearings?
Understanding the unique design of double-row bearings
Double-row angular contact ball bearings, which SKF manufactures, have been developed to have the advantages of having single-row angular contact bearings but at the same time have a higher load-carrying capacity than a single row. In essence, this remarkable bearing incorporates two rows of balls, which are contained in the single outer and inner rings arranged so that a built-in contact angle is created. This means that these bearings can be used in applications that apply radial and axial loads, thus opening up a wide range of applications.
Contact Angle: These are readily available in 25° or 35°, promoting the optimal use of axial loads.
Load Capacity: A row structure combines the forces better, enabling a higher load-bearing capacity than a single-row structure.
Speed Ratings: It is built to be light and reduce friction for better high-speed performance.
Material Composition: There is a preference in manufacturing the parts used, using high-quality steel for the bearings and ceramic balls to bring durability and resistance to wear.
Sealing Options: The bearings are also sold with seals or shields, which will promote and protect the bearings from contamination and promote lubrication.
Sizes/Dimensions: The bearings are available in sizes 10 to 150 millimeters to better suit all applications.
With these technical specifications and the design in place, SKF double-row angular contact ball bearings can be used for various tasks in the automotive industry, industrial machinery, and aerospace, where accuracy and reliability are vital.
Exploring the 30° contact angle advantage
A 30° contact angle within SKF double-row angular contact ball bearings results in a specific advantage for both manufacturers in line with dominating axial and radial loads. This angle allows the bearings to be loaded in both directions, making them appropriate for mounting where high-speed rotation and positioning accuracy are required. The shape of the contact enables even distribution of the operational load, which reduces stress and wear of the components, resulting in a longer operational life of the bearings.
Axial Load Capacity: They can support medium to high axial loads in both directions thanks to their increased contact surface area.
Radial Load Capacity: High radial load capability is there without deterioration of stability.
Speed Capability: Specially designed for operational speeds of such working tools as industrial machines, requiring considerable accuracy and high operational effectiveness.
Durability: The effect of localized pressure spots is diminished by adopting a 30° angle, allowing for increased bearing service lives in different working conditions.
This particular technical configuration makes these bearings a good choice in applications where one has to address reliability, load transfer, and endurance concerns for a long time.
How SKF’s advanced cage technology enhances performance
The advanced cage technology of SKF helps significantly improve the bearings’ performance by changing the load distribution, friction, and stability at elevated speeds. The novel designs of the cages allow for better lubrication flow and thus reduce the rate of damage progress and ensure effective performance under severe working conditions. As a result, the efficiency increases, and the service life of the bearings improves.
Material strength: Cages are made of either high-strength polymers or brass, which are selected based on performance criteria such as temperature resistance, which can be about 250 degrees.
Speed capability: It can handle rotational speeds of 1.6 million dN, meaning this type’s performance is reliable at very high speeds up to standby mode.
Friction reduction: Operating temperatures are significantly reduced, lowering the coefficient of friction, which results in energy savings.
Load distribution: Loads are more evenly distributed over the rolling elements, lowering the chances of localized stress concentrations.
All these parameters together guarantee the best output and wear resistance sufficient to render SKF’s advanced cage technology necessary for highly demanding industrial applications.
How do SKF double-row angular contact ball bearings handle loads?
Comparing axial and radial load capacities
The performance of SKF double-row angular contact ball bearings is well balanced regardless of conditions simply because they were designed to handle radial and axial loads.
Axial load capacity: A bearing will experience high loads in both axial directions, which these bearings can withstand thanks to the optimized internal design for such stability. The typical range of 25° to 30° in contact angle helps to distribute the force around the bearing and towards the axial load application.
Radial load capacity: Their structural organization, which features two rolling rows, allows the horizon to be covered by bearings on both sides, making them usable in radial loading situations. Size and material are dependent factors that affect radial load capacity in a bearing. Still, in most cases, it is equal to or greater than that found in similar single-row counterparts.
SKF double-row angular contact ball bearings, with their amalgamated properties of incorporating axial and radial load capabilities, can be utilized when the components are required to be operated whilst being under combined loads.
Benefits of two-directional thrust load handling
SKF double-row angular contact ball bearings can accommodate thrust loads in both directions, which benefits operational efficiency and performance. They also enhance operational stability by taking in axial forces from both sides. They are used in machine tools, pumps, gearbox systems, and bidirectional working parts.
Axial Load Capacity: The bearings can accommodate the same thrust loads in both directions, which helps ensure even load transfer and minimizes wear and tear over time. This capacity is angle-dependent, with contact angles ranging from 30° to 40°, which provides a good relationship between the axial and radial support offered.
High Load Rating: The double row increases the area of contact, meaning the load capacity can be raised against single ball bearings of equal size, thus creating an output with more reliability and longevity to its service.
Durability: These bearings are made of quality steel and subjected to heat treatments, strengthening them against deformation when bidirectional loads are applied at high rates.
This capability to handle thrust load in both directions allows bearings to be used in applications that demand precision, dependability, and high resistance to abrasion and mechanical stressors.
Impact of bearing arrangement on load distribution
How the bearings are arranged plays a significant role in how the loads are averaged through the system, affecting performance, life span, and reliability. Suitable bearing arrangements ensure that axial and radial loads are tolerated adequately without excessive stress concentration and, hence, wear is less.
Radial Load Distribution: Bearings are paired or set up as tandems or back-to-back so that radial loads are more uniformly transferred between them; however, this may not be the case. For example, back-to-back arrangements (DB), when applied, provide better rigidity and more control against tilting moments in applications requiring precision.
Axial Load Handling: Reading loads can be effectively handled with angular contact balls or thrust bearings. Tandem arrangements (DT) are superior for handling loads in the axial direction, as all the bearings in this arrangement will evenly distribute the load in the same direction.
Technical Parameters:
- Contact Angle (α): The axially supporting angle affects the component’s axial load capacity. While increasing the support angle increases the axial load handling capacity, it slightly impacts performance radially.
- Preload: Controlled preloading eliminates clearance space, resulting in better rigidity and load sharing. Conversely, high preloads may increase friction and shorten the bearing life.
- Speed Factor (n·dm): The bearings’ application has to be combined with their speed and average diameter (dm). Applications with a high rotary speed need a low friction ratio and an adequately supported load balance factor.
Misalignment Considerations: In shaft bending or deflection, choosing self-aligning bearings or installing compensatory designs ensures proper compensation for the loads.
Examining the bearing location with these parameters improves the load conditions essential for operational and equipment reliability.
What are the size options for SKF double-row angular contact ball bearings?
Common bore sizes: from 15 mm to 110 mm
Absolutely! While it helps to chew the fat around SKF’s double-row angular contact ball bearings, many readers would be interested in the standard bore sizes between 15 mm and 110 mm. Depending on the load and speed requirements, these sizes provide the necessary variety. The technical parameters for the categories above are as follows:
Dynamic Load Rating (C): This value logically varies with the bearing size and the design to ensure that the standard loads applied on the bearing during operation can be supported.
Static Load Rating (C₀): This parameter is referred to as determining the capability of the bearing to support a resting load without deformation.
Limiting Speed: The bearing cage, type, and material would determine the amount of lubrication and its internal configuration of the bearing, making the limit of rotational speeds variable.
Contact Angle: Generally designed at 30° or 40°, the range offered is a reasonably good unit, allowing for excellent axial and radial load capacity that is sufficient for the purpose.
These parameters are worked on with the realization that they will enable various industrial uses, proving that these bearings are suitable for multiple tasks.
Outer diameter and width specifications
To highlight my response directly, let me first emphasize that the outer diameter and width of the bearings need to be considered for particular applications. For example:
Outer Diameter (OD): When deciding the maximum outer diameter of the outer bearing ring, the task remains to ensure that the cross-section fits within the machinery’s housing dimensions while withstanding dynamic and static loads. For specific applications where the welding inspection is not critical, outer diameters can vary from 50 mm to several hundred millimeters.
Width: The width of the bearing results in how much axial load it can carry. A wider bearing rim or raceway, in general, enables more axial loads to be supported. For examples consider widths of 10 mm, 20 mm, 30 mm, and 40mm, even 50 mm could be designed matrices for numerous operational conditions.
These specifications are fixed according to operational requirements, machine configurations, and radial and axial forces. During this time, the bearings must achieve maximum operational efficiency and longevity. If you provide more details about your application, I will give you more concrete recommendations about these parameters.
Exploring the popular 5202 series bearings
The 5202 series bearings are pretty popular due to their capability to function in various parameters and conditions. Concerning your concerns, I would respond as follows:
Width: The most common widths for these bearings range from 10 mm to about 20 mm. They can carry radial or axial loads without occupying excess space.
Axial Load Capacity: Because of the unique construction featuring two rows of bearings, 5202 series bearings can take up significantly more axial load when compared with single-row bearings of the same size.
Radial Load Capacity: The structure and construction also allow large radial forces to be exerted, providing possibilities for applications where both radial and axial loads are to be supported simultaneously.
Materials: Most bearings are made using high-strength steel, which is effective in corrosion resistance and strength and, therefore, can withstand harsh conditions.
Lubrication: In most cases, they are lubricated in advance, which reduces service frequency and makes it possible to use the equipment for a long time without service.
These parameters are intended to provide reliability and ensure proper machine performance where space is limited, but loads are high. Should distinct work conditions exist, I may furnish the necessary modifications or recommendations related to the conditions described.
How do SKF double-row bearings compare to single-row alternatives?
Analyzing stiffness and rigidity differences
The differences between the stiffness and rigidity of the two alternatives are very apparent. SKF double-row bearings increase the load-carrying capacity and stiffness by utilizing two rows of rolling elements, thus distributing the weight evenly. As a result, they are helpful in scenarios where the radial and axial loads are substantially high or if the system needs increased rigidity.
Their dynamic and static load ratings significantly improve load capacity, making them adaptable for high-demand tasks requiring devices’ energy to perform as intended.
Another aspect of this division is misalignment tolerance, which gives single-row bearings a slight edge over double-row bearings because they allow slight angular misalignments.
Size Efficiency is one highly advantageous feature of the double row. Its exact outer dimensions can lift significantly greater loads, making it ideal for areas with little space.
Another plus point is rigidity, as dual rows increase the overall stiffness. This allows minimal deflection while the weight is applied, significantly improving the system’s stability.
Given these aspects, SKF double-row bearings work well when the application requires a greater load capacity and rigidity. Still, they do not mind the significant inability to adjust the angular misalignment.
Space-saving benefits of double-row designs
Double-row bearing designs can be considered a breakthrough in accommodating space constraints in mechanical systems. They can handle higher load capacities with the same or smaller outer dimensions, making them perfect for compact assemblies. Instead of having a single-row bearing, double-row configurations can easily accommodate the load of the two rows of rolling elements, increasing stability without increasing size.
Bearing Outer Diameter: Allows for an increase in load-handling capacity while retaining the diameter of the single-row alternatives.
Load Rating: While utilizing the radial and axial double-row bearing, load ratings are substantially increased, significantly improving overall operational performance.
Rigidity Factor: The decreased deflection under heavy loads due to the increased stiffness from dual rows is a significant advantage, especially in space-limited areas that require precision.
Incorporating double-row bearings into the designs allows one to strike the perfect balance between performance and size. It also ensures that the device would function well under extreme conditions.
Performance comparison in high-speed applications
Cuando se tienen por delante solicitudes de alta velocidad, los rodamientos de doble hilera tienen ciertas ventajas. Primero, su rigidez naturalmente más alta lleva a reducción de deformaciones, lo que permite tolerar velocidades más elevadas, y esto se debe a que estos son de dos hileras que soportan esfuerzos en superficie en forma más eficiente. También, porque la rotación con alta velocidad en los rodamientos de doble hilera es más estable debido al menor juego interno que estos poseen.
Capacidad máxima de RPM: Los rodamientos de doble hilera suelen desarrollar ligeramente menos RPM límites en comparación con los diseños de hilera única debido a la mayor superficie en contacto, pero los avances en los materiales y en la lubricación muchas veces compensan estas limitaciones.
Clase de Carga Dinámica: Una mayor carga dinámica garantiza que el rodamiento sea capaz de cumplir las condiciones de trabajo a alta velocidad y gran carga al ser utilizados conjuntamente.
Disipacion de Calor: Una mejora en la distribución de la carga disminuye el esfuerzo concentración y por lo tanto la temperatura en la zona de trabajo.
En definitiva, si hay velocidad y control de cargas a la aplicación, los rodamientos de doble hilera parecen ser una buena combinación en orden para asegurar un buen desempeño en condiciones difíciles.
What sealing options are available for SKF double-row angular contact ball bearings?
Understanding contact seal and shield variations
I can summarize the sealing options available for the SKF double-row angular contact ball bearings. These bearings can be fitted with either contact seals or shields, which perform specific functions depending on the target use of the bearing.
Contact Seals: This sealing mechanism is best used in applications with a higher likelihood of contaminant exposure, such as dust, humidity, and other debris that can damage the machine. These seals dampen friction at the inner ring while enabling it to be lightly gripped, making it easier for the machine to operate. When faced with contamination, contact seals from all sides and angles outperform the competition.
Friction Level: Low contact ensures the friction level is low, but the contact guarantees a slightly increased level for the shielded.
Operating Temperature Range: The temperature can typically reach 120 degrees Celsius (248 degrees Fahrenheit), but this can be adjusted by using different or unique materials.
Shields (non-contact): These shielded bearings are preferred in conditions with low chances of contamination. They aim to block larger contaminants from infiltrating the bearing, maintaining lower temperatures and enabling high spinning rates.
Friction Level: The rotors experience almost no friction while spinning, allowing them to operate faster and reduce consumption.
Operating Temperature Range: Depending on the material utilized, the bearings can reach a maximum temperature of 150 degrees Celsius (302 degrees F).
It suffices to state that both of these variants can increase a machine’s efficiency, depending on the conditions and loading requirements of the environment. Each variant has been designed for a specific purpose. Factors such as the machinery’s speed and operating conditions determine whether one or another should be utilized.
Benefits of 2RS sealed bearings
I think 2RS sealed bearings significantly protect internal structures and overall durability. These bearings include back seals on both sides, making them a perfect option for use in extreme operating conditions or at a higher chance of contamination since the seals prevent dust and moisture from entering the bearings.
Improved Contamination Resistance: A compliment of the dual rubber seals is that the seals provide a neat enclosed basket, which prevents the effective inner surfaces from contamination with dirt, water, and any other substances that may interfere with functioning.
Reduced Maintenance Intervals: The sealed structure of these bearings ensures lubrication retention; hence, the frequency of relubrication reduces with its attendant downtime.
Wide Operating Temperature Range: However, with some unique materials, the maximum temperature range that can be maintained is higher than 120°C (248°F). In most cases, temperature ranges from −40 ° C (−40 ° F) to 120 ° C (248 ° F) are operational.
Mild Friction: Seals have been found to add a higher level of friction than shield bearings, but this is offset by enhanced protection and improved reliability.
Suitable for Varied Applications: These are well suited for applications that require protection from mild to high degrees of contamination or where the frequency of maintenance access is low.
In this context, these properties and parameters allow me to stress the practicality and availability of a dimensional series of 2RS sealed bearings by adequately selecting the bearing according to the operational parameters and the harsh conditions under which it works.
Choosing the proper seal for your application
When you choose a seal for your application, it is crucial to consider the particular operational environment so that the seal performs optimally for as long as possible. So here are the specific factors I consider:
Contamination Levels: Bearing seals are critical for sustaining operation in extreme conditions, which is why, whenever I expect conditions such as dust, moisture, or dirt, I tend to work with 2RS sealed bearings because of their ability to withstand such environments.
Temperature Range: This type of bearing works well under certain extreme temperatures. However, when available options might surpass these limits, I employ it to broaden the usable possibilities while maintaining the reliability factor. Generally, 2RS bearings may function well under temperatures from -40 to 120 degrees Celsius.
Maintenance Accessibility: If maintenance intervals are infrequently met or challenging to access, I prefer using 2RS sealed bearings. Their mechanics ensure better device management and operation for long periods, helping minimize downtime.
Operational Speed and Friction: There is a certain amount of friction that is introduced with the use of 2RS seals as opposed to the use of shielded bearings; however, in situations where intense sealing is needed, I’d stress that shields and 2RS seals are not ideal for the application. It is, moreover, justifiable as the ultimate performance doesn’t exceed the specified requirements while succeeding in resisting moderate speed.
Considering these factors and my application’s requirements, I provide a reasonable argument in favor of using 2RS sealed bearings, which satisfactorily satisfy both technical and environmental aspects.
Frequently Asked Questions (FAQs)
Q: What is the advantage of including a double-row angular contact ball bearing SKF in the design?
A: The fact that a combination of Double-row angular contact ball bearings SKF are used enables the bearings to withstand high axial and radial loads in opposite directions, facilitates an increased stiffness than with single-row bearings, and offers more excellent capabilities in applications that need high precision. These bearings are essential in cases where space is a constraint, as they can pair with back-to-back two single-row angular contact ball bearings and occupy a smaller axial space.
Q: What is the relation between a double-row angular contact ball bearing internal clearance and its functioning?
A: The clearance factor significantly influences the functionality of double-row angular contact ball bearings. The SKF range offers several C3 clearance options, which provide slightly increased internal clearance over standard ones. Under the right conditions, a properly fitted bearing can distribute the load evenly and reduce friction, enabling a longer lifespan. The application specifications must be considered during the clearance selection procedure.
Q: Do dual-row angular contact ball bearings support radial and axial loads?
A: Of course, dual-row angular contact ball bearings are made so that they can support radial and axial loads at the same time. This is made possible by their configuration, which has two rows of balls and raceways, further having contact angles that enhance their radial and axial load capabilities. This results in the support of the combined loading applications.
Q: Are metric sizes available for SKF double-row angular contact ball bearings?
A: The sizes of SKF double-row angular contact ball axles are also available in metric sizes. For instance, certain bearings can be constructed with specific inner diameters, outer diameters, and widths to meet the requirements of particular applications. For example, one can find bearings of 15 mm bore and 35 mm O.D and 50mm and 110 mm O.D bearings. The metric bearings with which the enhanced size range is featured are also contained in the SKF Explorer series.
Q: In what aspects are double-row angular contact ball bearings better than deep groove ball bearings?
A: Although both types can be regarded as non-specialized, double-row angular contact ball bearings are better than deep groove varieties in stiffness and axial load-carrying capacity. They are preferred when heavy combined loading and precise shaft positioning are involved. On the other hand, deep groove ball bearings have relatively high-speed capability with lower friction and can operate wherein radial loading is predominant.
Q: How do I know if a double-row angular contact ball bearing is best for my task?
A: To start, one must confirm that the mentioned bearing type suffices their requirements. As such, they can look at the direction and type of the load or its intensity, the rotational velocity, the available room, and precision. These bearings are excellent for applications where significant combination loads exist; the load is expected to be high in diameter and when the axial length is restricted. If you still have questions, contact the technical support department from SKF or use the online selector tools they provide to choose the appropriate bearing for your needs.
