Thrust bearings are rotary bearings intended to withstand axial loads while preventing motion in a specific direction. They are critical components in heavy equipment with high loads and speeds to ensure efficient and dependable operation. These units are also available in various materials and can be customized for specific applications.
This article will take a closer look at how thrust bearings work and their different industrial applications.
How Thrust Bearings Work
Also called axial bearings, thrust bearings are composed of two flat surfaces (flat washers or a pair of thrust plates) separated by rolling elements (balls or rollers). These elements enable smooth movement while also reducing friction between the two surfaces. They also work by providing a layer to guide and support axial loads.
After an axial load is applied to one of the surfaces, the rolling elements distribute it evenly across the bearing’s surface area. This allows for smooth rotation while reducing the risk of wear and tear on the surrounding parts. In addition, these components are often made from ceramic and various metals to meet specific requirements for strength, durability, and corrosion resistance.
Industrial Uses of Thrust Bearings
Generally, bearings are an essential part of many industrial processes that rely on efficient and reliable operation due to their efficient structure and versatility. The following are some of the most common applications of axial bearings:
Manufacturing Equipment
Axial bearings support the loads generated by manufacturing equipment, such as extruders, mixers, and stamping machines. For example, extruders and mixers have components to support the heavy forces generated by the screws, barrels, blades, or impellers that process the raw materials. The bearings also ensure that the punch moves in a linear direction and is not deflected by the force of the stamping.
Pumps and Compressors
As axial movement can cause excessive wear and tear, bearings are used in centrifugal pumps to hold the impeller in position. They also aid the absorption of high axial loads generated by the piston or diaphragm in other pumps and compressors.
Another industrial application is gas and steam turbines, often found in power generation facilities. They help the rotors operate smoothly and efficiently while decreasing maintenance costs and machine failure.
Automotive and Aerospace Components
Axial bearings are used in automotive transmissions to control the loads between the ring and pinion gears in differential gears. In the aerospace industry, they support the loads from the propellers, turbines, and other rotating components of airplane engines. Additionally, they are utilized in aircraft landing gear assemblies for takeoff and landing.
Marine Applications
An essential component of propeller shafts in the marine industry, axial bearings are designed to endure harsh marine environments. These include saltwater exposure, high pressure, and varying temperatures. They also help to reduce the strain on the propeller shaft and improve its efficiency, ensuring the vessel’s reliable and smooth operation.
Propeller shafts are also vulnerable to external forces, which can cause misalignment between the shaft and the engine, resulting in costly repairs and downtime. The axial components are often designed to be self-aligning to address this issue. This means they can tolerate some misalignment without causing damage to any unit.
Mining and Construction
Since heavy equipment is often utilized to extract and transport materials in mining and construction, axial bearings are crucial in these industries. They are especially useful in conveyor systems, where they support the weight of the belt and the materials being transported. They are also employed in crushers to help stabilize the main shaft, which is in charge of crushing hard rocks or materials.
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Radial ball bearings are rolling-element bearings that support loads and reduce friction between shafts and stationary components in mechanical applications. They are made up of two rings (inner and outer) that are connected by a cage that holds the balls in place. This allows them to rotate freely within the bearing.
These bearings are known for their versatility, durability, and high radial load capacity, making them popular in diverse automotive, aerospace, and manufacturing industries. However, selecting the proper bearing for a certain application necessitates careful consideration of various factors. The following are essential parameters to be aware of when it comes to this bearing type:
1. Load Direction, Type, and Magnitude
The load-carrying capacity of the bearing changes depending on whether the load is applied axially, radially, or a combination of both. For instance, radial loads act perpendicular to the shaft’s axis, whereas axial loads act parallel. Therefore, it is critical to select a bearing that can withstand the exact direction of the load.
Radial ball bearings can be subjected to two types of loads: static and dynamic. Static loads are applied to the bearing at rest, while dynamic loads are exerted in motion. Choosing a bearing that can tolerate certain loads is essential, as dynamic loads expose the component to greater pressures. This will also increase their risk of breaking prematurely.
Another crucial factor is the magnitude of the load, as the bearing’s load-carrying capacity must be greater than the maximum load it would face. Therefore, selecting a radial component with insufficient load capacity might result in premature failure and expensive downtime.
2. Inner or Outer Ring Rotation
Another important factor when choosing a ball bearing is whether the inner or outer ring will rotate during operation. When the inner ring rotates, a sliding motion is created between the rolling elements and the raceway. This sliding motion generates heat, which can cause the component to wear prematurely and fail.
Conversely, when the outer ring rotates, it creates a rolling motion between the rolling elements and the raceway. This motion generates less heat and friction, making it excellent for high-speed, heavy-load applications. However, outer ring rotation might cause misalignment and vibration, potentially leading to component failure.
3. Bearing Size and Type
Bearing size refers to its internal and external dimensions, which should be chosen depending on the application’s specific needs. On the other hand, bearing type is the particular design of the component, such as deep groove, angular contact, or thrust. This can affect its load-carrying capacity, speed, and ability to bear radial or axial loads.
4. Fit Tolerances of Mating Components
Fit tolerance refers to the tightness between the bearing and the other parts, and it can affect weight-carrying capacity, speed capabilities, and performance. For example, an interference fit, which involves pressing the bearing into its housing or onto its shaft, can increase its load-carrying capacity. Contrarily, a clearance fit — where there is a gap between the components — can limit the bearing’s maximum load.
5. Operating Temperature
When the operating temperature of radial ball bearings is high, it can cause the components to expand thermally. This expansion can change the clearance or preload, leading to quick wear and failure. The choice of material is also critical because different materials have varying temperature limits. Therefore, choosing one that can perform optimally under the required operating temperature is important.
6. Running Accuracy
Running accuracy is the ball bearing’s ability to maintain precise dimensional and rotational tolerances, which can impact its performance, speed, and durability. It is often influenced by the manufacturing process, design, and material selection. For example, high-precision bearings are required for applications that demand tight dimensional and rotational tolerances, such as machine tools and aerospace equipment.
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Flanged bearings are essential in operating a wide range of machinery and equipment, including motors, pumps, fans, conveyors, and more. They are designed to withstand axial and radial loads, which is beneficial for applications where the shaft axis is perpendicular to the mounting surface. Moreover, they contribute to equipment’s longevity and smooth functioning as they can support heavy loads.
When selecting flanged bearings, it is vital to consider key elements to ensure that you have the appropriate component for your needs. The following factors should be taken into consideration when making your decision:
1. Material
It is critical to select bearings made of materials compatible with your application because they can affect overall performance and durability. Several factors — operating temperature, exposure to corrosive substances, load requirements, and more — play a role in determining the best material for a specific purpose.
For example, stainless steel is the best metal for corrosive environments. Meanwhile, cast iron is an excellent choice for high-load applications, as it is extremely strong and durable. It is also important to note that most components are not made from a single material. Therefore, you must determine which combination works best for you.
2. Load Capacity
Load capacity refers to the maximum load a bearing can withstand without failing. It is typically determined by various attributes, such as the size, material, and design of the bearing. Before selecting a flanged bearing, you must identify your application’s anticipated radial and axial loads. This information can be obtained from the manufacturer or by using engineering calculations.
3. Size
The size of the flanged bearing determines the load capacity and the shaft size it can support. Therefore, check whether or not the bearing size matches the shaft and mounting dimensions. It is also recommended to consider the clearances between all parts and components to ensure that everything operates smoothly without excessive wear.
4. Sealing
Flanged bearings are available in two main types: open and sealed. Every kind of sealing offers distinct advantages and disadvantages, making it important to choose the right type for your application.
Open Bearings
Open bearings are the most economical option and do not have seals or covers to protect against contamination. However, they do require regular lubrication to keep them functioning properly. They are also susceptible to contamination from dirt, dust, and other particles that can reduce their lifespan.
Sealed Bearings
Sealed bearings have seals or covers that protect against contamination and require less maintenance. They are more expensive than open bearings but provide better protection against contamination and typically have a longer lifespan. There are various types of sealed bearings, including contact seals, non-contact seals, and labyrinth seals.
5. Lubrication
Proper lubrication is crucial for the performance and longevity of flanged bearings, as it helps to reduce friction, minimize heat generation, and prevent contamination. They can be lubricated in various ways, including grease, oil, and a combination of the two.
Grease lubrication is a convenient and economical option, providing a long-lasting lubricating film that reduces the need for frequent re-lubrication. On the other hand, oil lubrication offers better cooling and is recommended for high-speed applications.
6. Speed
Flanged bearings operate at specific speeds, making it critical to select the appropriate speed rating for your application. When a bearing operates at speeds faster than its rated velocity, it generates excessive heat, shortening its lifespan and potentially leading to failure. Meanwhile, if it runs at bandwidths lower than its rated speed, it may not provide the required performance.
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Ball bearings are essential components in numerous mechanical systems and machines as they facilitate seamless and effective rotation of moving parts. Stainless steel is an excellent option for ball bearings because it can resist rust and corrosion. As a result, it becomes especially valuable in applications where contact with harsh chemicals or moisture is likely to occur.
This article will explore the mechanical properties of stainless steel ball bearings and the benefits that come along with them. We will also discuss the different types of these bearings and their applications.
Mechanical Properties of Stainless Steel Bearings
Stainless steel ball bearings possess various desirable mechanical properties, making them popular for multiple applications. One of the most notable properties is their high corrosion resistance, which allows them to perform well in environments prone to chemical exposure or moisture. This is due to the presence of chromium in the alloy, forming a protective oxide layer on the surface of the bearing.
The ball bearings can be utilized intermittently in temperatures of up to 250–300 °C. This is applicable as long as they are accompanied by a stainless steel cage and a suitable lubricant capable of withstanding high temperatures. If the temperature exceeds these limits, the load capacity of stainless steel may be compromised.
Another important mechanical property of these ball bearings is their high load-bearing capacity. This property makes them suitable for applications where heavy loads need to be supported. Depending on the specific type, they can handle radial and axial loads and operate at high speeds while maintaining stability and smoothness.
Types and Applications of Stainless Steel Bearings
Stainless steel ball bearings are available in various types and configurations to suit different application requirements. Here are five of the most common types:
Deep Groove Ball Bearings
Deep groove ball bearings are an excellent choice for applications that require a reliable and versatile bearing solution. Their simple design consists of a single row of balls running in deep grooves cut into the inner and outer raceways. Moreover, their high load capacity and availability in various sizes make them ideal for machinery and equipment, such as electric motors, pumps, and compressors.
Angular Contact Ball Bearings
Angular contact ball bearings can handle both radial and axial loads. They feature two rows of balls set at an angle to each other, enabling them to manage both types of loads simultaneously. Moreover, they can accommodate some misalignment between the shaft and housing. This makes them suitable for applications where perfect alignment is difficult, such as tool spindles and pumps.
Thrust Ball Bearings
Thrust ball bearings are primarily intended to support axial loads. They comprise two washers and a set of balls placed between the washers. The balls run along a grooved track in the washers, enabling the bearings to support the load. These bearings are commonly used in automotive transmissions and heavy machinery. They are also ideal for applications with limited space due to their compact design.
Self-Aligning Ball Bearings
Self-aligning ball bearings are designed to tolerate misalignment between the shaft and the housing. They comprise three components: an inner ring, an outer ring, and a set of balls. The outer ring is spherical, allowing it to adapt to the inner circle, which helps the bearing accommodate any misalignment. These bearings are useful in conveyor systems and printing presses, where misalignment can frequently occur.
Stainless Steel Pillow Block Bearings
Stainless steel pillow block bearings include a housing and a bearing insert. They are typically utilized in applications that require support and mounting, such as material handling equipment and conveyor systems. Their housing is generally mounted to a surface using bolts or screws while the bearing insert is placed inside.
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Contact us today to learn more about our products and capabilities, or browse our catalog. We also welcome requests for quotes and look forward to working with you on your next project!
A ball bearing is a bearing between an axle and a wheel with a ring of small solid metal balls reducing friction between the rotating and stationary parts. Precision ball bearings have higher standard precision levels than most components. In various applications, they employ at least two races to contain and transfer loads through the balls — with one race fixed and the other connected to the rotating assembly.
Precision ball bearings are used in different industries, including aerospace, health, manufacturing, automation, and commercial construction sectors. This article will discuss the functions, structures, and types of ball bearings used for various applications.
What Is a Ball Bearing Used For?
A ball bearing connects two parts and components that lie close to one another while providing minimal frictional resistance to motion. Usually, one of the components is a rotating shaft while the other is a stationary housing.
The balls rotate as a result of the rotation of the bearing races, lowering the frictional coefficient between them. The load capacity of the ball bearings is also lesser than that of other types of bearings of comparable size due to the smaller contact points between the races and the balls.
What Is the Basic Structure of a Ball Bearing?
A ball bearing comprises four major parts: two rings or races (outer and inner), balls or the rolling elements, and a retainer or the ball separator. The outer race is fixed and mounted into the housing, contributing to the transfer of radial load from the bearing to the housing. On the other hand, the inner race supports and directs the rotating shaft.
The rolling elements transport the load and distribute it across the pathways; they rotate at a different speed than the inner race but revolve around it. Lastly, the separator is positioned between the balls and functions as a barrier preventing them from colliding.
What Are the Different Types of Ball Bearings?
The following are the various types of ball bearings:
Radial Bearings
Also referred to as deep groove ball bearings, this type is one of the most commonly used bearings for various applications, including machinery and certain motors. They can carry axial and radial loads but are mainly employed when the primary load moves radially.
Electric motors are the most common industrial application of radial ball bearings to support loads and motion in axial directions between the housing and the shaft. They are also useful for industrial pumps where liquids shoot up, causing the axial load to switch directions momentarily before resuming its original orientation.
Radial bearings do not need to be purchased in pairs, making them an excellent option for applications with limited space.
Angular Contact Bearings
Angular contact bearings are asymmetrically designed to achieve high speeds and withstand radial-axial loads. Although they can only tolerate unidirectional axial loads, they can support loads that are not perpendicular to the bearing axis. In addition, they have one or both shoulders that are elevated and must be assembled with a thrust load for proper operation.
These bearings are ideal for gearboxes, electric motors, pumps, clutches, and other high-speed applications. They are also used in material handling, machine tools, steel mills, and wind energy.
Thrust Bearings
Thrust bearings are special rotary bearings that allow rotation between the parts. They are designed to support a predominantly axial load as they cannot handle the radial ones. They are also mounted directly on the seating surface, not the shaft or housing.
Thrust ball bearings are used in low-thrust applications with little axial load, such as automotive, generators, water turbines, heavy-duty machinery, industrial machinery, and mining and construction. Visit this page to learn more about the applications of thrust bearings.
