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Bearing

 
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Wide range of Brands covered: Nsk, skf, ntn, fag, ina, koyo, ezo, nmb, iko, thk, timkne, nachi, mcgill, elges, fyh, asahi, ijk, east, rollway, samick, hrb, zwz, lyc, tr, but, zhbr, yfa, hzy, qcs, and other well-known domestic and foreign brands. The bearing models of major brands are complete, and customers can purchase them in a one-stop manner.

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Definition of Bearing

 

Bearings are "parts that assist objects' rotation". They support the shaft that rotates inside the machinery. Machines that use bearings include automobiles, airplanes, electric generators and so on. They are even used in household appliances that we all use every day, such as refrigerators, vacuum cleaners and air-conditioners. Bearings support the rotating shafts of the wheels, gears, turbines, rotors, etc. in those machines, allowing them to rotate more smoothly. In this way, all sorts of machines require a great many shafts for rotation, which means bearings are almost always used, to the point where they have become known as "the bread and butter of the machine industry". At first glance, bearings may seem like simple mechanical parts, but we could not survive without bearings.

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Benefits of Bearing

 

 

 
 

Increased load capacity

Bearings are designed to have more rolling elements than standard bearings. As a result, they have a higher load capacity, making them ideal for heavy-duty applications.

 
 

Compact design

Bearings can achieve a higher radial load capacity within the same space, making them ideal for applications with limited radial space.

 
 

Increased contact area

The larger number of rolling elements increases the bearing's contact area, distributing the load more evenly and enhancing lifespan under heavy load conditions.

 
 

Cost-effectiveness

The simpler design without a cage can be more cost-effective in terms of manufacturing.

 
 

Shock resistance

Bearings are better suited to absorb shock loads due to the increased number of rolling elements.

 
 

Low-speed applications

Bearings are particularly effective in applications where high load capacity is required at lower speeds.

 
 

Better durability

Covering 30+ industries such as real estate ,finance ,manufacturing ,Internet ,etc. ,it has accumulated 1,800 + well-known enterprise practice cases.

 
 

Improved lubrication

Since bearings have no cages or separators, there is more space for lubricant, which provides better lubrication. The lack of a cage also means that there is no friction between the cage and rolling elements, which reduces wear and tear.

NACHI Deep Groove Ball Bearing

 

Two Important Features of Bearings

Bearings are essential machinery components that allow for rotational or linear movement while minimizing friction and ensuring smooth operation. They are used in various industrial applications, from heavy machinery to precision instruments. Several types of bearings are available, each with its own features and benefits.
The importance of bearings in facilitating smooth machine operation cannot be overstated. Bearings play two significant functions in this regard.
• They reduce friction and ensure smoother rotation by separating the rotating shaft from its supporting parts. It is crucial, as the conflict between these components can cause operational issues and lead to energy wastage. Bearings are integral to machine performance, enabling efficient and effective operation.
• Bearings are instrumental in firmly securing the rotating shaft in its desired location and carrying the load exerted upon it. It ensures that machines can perform their intended functions repeatedly and effectively.

 

What are the Main Parts of Bearing?

Bearings typically consist of the following components:


Two rings, inner and outer, with raceways.
The inner and outer ring are typically made from a high-purity, chrome alloy steel. This material has the necessary hardness and purity important factors for high load ratings and a long service life.

 

Rolling elements - rollers or balls
Rolling elements can be balls, rollers, cones, spheres or needles. They are usually made from a special high-purity, chrome alloy steel. Special materials such as ceramic and plastics can also be produced.
The rolling elements roll on the raceways of the rings and are separated and guided by the cage.

 

A cage which keeps the rolling elements spearted and helps guide motion.
The cage is responsible for keeping the rolling elements separated while guiding them in motion. The materials used include steel, brass and plastic. Solid metal cages can be produced using machining techniques, while pressed cages are made from sheet metal. Similarly, plastic cages can be machined from solid plastic or injection molded.

TOYOTA Hub Bearing
HONDA Hub Bearing

Materials of Bearing

 

The Bearing material must be able to withstand and resist chemical attack by the lubricant oxidation by-products generated when the lubricant begins to break down or from any other contaminants in the oil, caused by the combustion process (i.E. Soot or fuel dilution). Oxidation inhibitors in the oil need to be reviewed to ensure compatibility with the Bearing material. The effects of oil under high temperature and pressure must also be considered although this is usually only achieved through engine testing. Typical corrosive products are alcohols, aliphatic and aromatic hydrocarbons, ethers, and weak acids and alkalis.

Bearing Runout & Rigidity

 

Bearing runout is the amount a shaft orbits from its geometric center as it rotates. Some applications, like cutting tool spindles, will only allow a small deviation to occur on its rotating components.

If you are engineering an application like this, then choose a high precision bearing because it will produce smaller system runouts due to the tight tolerances the bearing was manufactured to.

Bearing rigidity is the resistance to the force that causes the shaft to deviate from its axis and plays a key role in minimizing shaft runout. Bearing rigidity comes from the interaction of the rolling element with the raceway. The more the rolling element is pressed into the raceway, causing elastic deformation, the higher the rigidity.

Bearing rigidity is usually categorized by:
• Axial rigidity
• Radial rigidity
The higher the bearing rigidity, the more force needed to move the shaft when in use.

HONDA Hub Bearing
How Do I Select a Bearing for Use?

 

Deep groove normally used for radial and thrust loads.Thrust load can be up to maximum two-thirds of radial load.

Angular Contact Ball Bearings are designed to support combined radial and thrust loads or heavy thrust loads depending on the contact-angle magnitude. Bearings having large contact angles can support heavier thrust loads.

 

Self - Aligning Ball Bearings may be used for primarily radial loads where self-alignment ±4° is required. Extra care should taken while selecting these types of bearing as excessive misalignment or thrust load greater than 10% of radial load can cause early failure.

Spherical Roller Bearings are excellent for heavy radial loads and moderate thrust. Their internal self-aligning feature is useful in many applications such as HVAC fans.

Cylindrical roller Bearings utilize cylinders with approximate length/diameter ratio ranging from 1 : 1 to 1 : 3 as rolling elements. Normally used for heavy radial loads. Especially useful for free axial movement of the shaft.

Taper Roller Bearings are used for heavy radial and thrust loads. The bearing is designed so that all elements in the rolling surface and the raceways intersect at a common point on the axis thus true rolling is obtained. Where maximum system rigidity is required, the bearings can be adjusted for a preload.

Thrust Ball Bearings may be used for low-speed applications where other bearings carry the radial load.

 

Straight-Roller Thrust Bearing these bearings are made of a series of short rollers to minimize the skidding, which causes twisting, of the rollers. They may be used for moderate speeds and loads.

Needle Bearings these bearings have rollers whose length is at least 4 times their diameter. They are most useful where space is a factor and are available with or without inner race. If shaft is used as inner race, it must be hardened and ground. Full-complement type is used for high loads, oscillating, or slow speeds. Cage type should be used for rotational motion. They cannot support thrust loads.

 

How Do I Know What Size Bearing I Have?
 

 

Reference Numbers
The quickest way to determine which bearing you require is using the bearings reference number.
Most bearings have their references numbers engraved on the bearings themselves, but these often rub off over time and so it may be necessary to measure the bearing yourself.

 

Measuring Bearings
It is sometimes necessary to measure bearings to determine the correct bearing type.
You can measure the dimensions of a bearing by using a vernier calliper like the one below or measuring accurately with a ruler.
All bearings will have a width, an inner diameter and an outside diameter.
Once you have determined the dimensions of your bearing, you can use our bearing search tool to find the correct bearing.

 

Bearing Suffixes
Once you measured your bearing, you can use our search to find the correct bearing size.
e.g. Inside Diameter: 25mm; Outside Diameter: 52mm; Width: 15mm - Bearing Type: 6205
Once you know the bearing you need based on size, you can then choose further options:
The bearing also has a seal either side of the bearing and this will be indicated by the suffix:
ZZ or 2Z = 2 Metal Shields
2RS1 or 2RSR or DDU= 2 Rubber Seals
Additionally, bearings also have a clearance value. This provides the bearing room for expansion between the bearing races and will add a small amount of play between the two rings.
An example of where a larger clearance is required is if a bearing is likely to get hot. The heat needs room to escape otherwise there is a risk of bearing failure.
C2 = Clearance is less than international standard
No Markings = Standard Clearance
C3 = Clearance is greater than international standard
C4 = Clearance is greater than C3

 

7 Types of Bearings Used in Automotive Applications

 

 

Bearings play a crucial role in automotive applications, providing support and facilitating the movement of various components. There are several types of bearings used in automotive systems, each designed for specific purposes. Here are seven common types:

 

Ball bearings
Function: Ball bearings consist of small, spherical rolling elements (balls) held in a ring. They reduce friction between rotating surfaces, allowing smooth and efficient motion.
Automotive applications: Wheel bearings are a common application in vehicles. They support the rotating hub and allow smooth wheel movement. Ball bearings are also used in alternators and gearboxes due to their ability to handle high-speed rotation.

 

Roller bearings
Function: Roller bearings use cylindrical or tapered rollers instead of balls. The rollers distribute the load over a larger surface area, enabling them to handle heavier radial and axial loads compared to ball bearings. This design reduces friction and provides increased durability.
Automotive applications: Tapered roller bearings are commonly employed in wheel hubs, where they support the vehicle's weight and handle the forces associated with acceleration and deceleration. They are also used in differentials and transmissions, where high loads and durability are crucial.

 

Needle bearings
Function: Needle bearings serve the purpose of handling high radial loads in situations with restricted space due to their thin, cylindrical rollers featuring a high length-to-diameter ratio.
Automotive applications: Renowned for their efficiency and capacity to endure substantial loads, these bearings find common application in automotive components like gearbox shafts and connecting rods, particularly in instances where space limitations are a significant consideration.

 

Thrust bearings
Function: Thrust bearings are designed to accommodate axial loads, preventing movement along the axis of rotation. They come in various types, including ball thrust bearings and roller thrust bearings, each optimized for specific load and speed conditions.
Automotive applications: Clutch release bearings are a common example of thrust bearings in automotive systems. They facilitate smooth engagement and disengagement of the clutch by handling the axial loads associated with these operations.

 

Spherical bearings
Function: Spherical bearings facilitate misalignment and angular movement owing to their spherical inner and outer rings. This adaptability is particularly beneficial in scenarios where components may undergo diverse angles of motion.
Automotive applications: In the automotive realm, spherical bearings are commonly employed in suspension components like control arms and strut mounts. Their presence allows the suspension system to absorb shocks and vibrations while accommodating movement in various directions.

 

Plain bearings (bushings)
Function: Plain bearings, commonly referred to as bushings, provide a sliding surface between two components to reduce friction. Unlike rolling element bearings, plain bearings operate with a sliding motion. They consist of a cylindrical sleeve, often made of materials like bronze or polymer that fits around a shaft.
Automotive applications: Plain bearings are used in various automotive applications where sliding motion is necessary. For instance, they are commonly found in suspension systems, providing a low-friction interface between moving components like control arms and sway bars. Engine connecting rod bushings and various pivot points in the vehicle's chassis also utilize plain bearings.

 

Angular contact bearings:
Function: Angular contact bearings are designed to handle both radial and axial loads by placing the load at an angle to the bearing axis. This configuration allows for increased load-carrying capacity compared to standard ball bearings.
Automotive applications: Angular contact bearings find applications in scenarios where both radial and axial loads are present, such as in front wheel hub assemblies. In these assemblies, the bearing accommodates the weight of the vehicle (radial load) as well as the lateral forces experienced during cornering (axial load). This design enhances the overall stability and performance of the wheel assembly.

 

How to Choose the Right Bearing for Your Application?

 

Find the Bearing Load & Load Capacity
First, know the type and amount of bearing load that your application will place on the bearing. Small-to-medium-sized loads usually work best with ball bearings. Heavy load applications usually work best with roller bearings.

 

Know the Rotational Speed of Your Application
Determine the rotational speed of your application. High speeds (RPM) usually work best with ball bearings and lower speeds usually work best with roller bearings.

 

Factor in Bearing Runout & Rigidity
You also want to determine what kind of runout your application will allow. If the application allows only small deviations to occur, then a ball bearing is most likely your best choice.

 

Find the Right Lubrication for Your Bearings Needs
For high-speed applications, calculate your n*dm value, and if it's higher than the grease max speed, then the grease won't be able to provide sufficient lubrication. There are other options like oil misting. For low-speed applications, an oil bath is a good choice.

 

Our Factory
 

Zhejiang Zhongji Changsheng E-commerce Co., Ltd. was established in 2020 and mainly operates a bearing trading platform. In March 2022, the platform's consignment sales performance exceeded 10 million, and in November 2022, there were over 1000 platform suppliers. In March 2023, the platform's consignment sales performance was nearly 20 million. In 2023, the company's self operated automotive parts business was fully launched, mainly for chassis components such as automotive bearings, ball heads, swing arms, and stabilizer bars. At the same time, pneumatic components were launched and online exhibition business was opened, Promote excellent manufacturers' brands.

Brands covered include: Nsk, skf, ntn, fag, ina, koyo, ezo, nmb, iko, thk, timkne, nachi, mcgill, elges, fyh, asahi, ijk, east, rollway, samick, hrb, zwz, lyc, tr, but, zhbr, yfa, hzy, qcs, and other well-known  

 

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FAQ

Q: Why is a bearing called a bearing?

A: The term "bearing" is derived from the verb "to bear"; a bearing being a machine element that allows one part to bear (i.e., to support) another. The simplest bearings are bearing surfaces, cut or formed into a part, with varying degrees of control over the form, size, roughness, and location of the surface. Other bearings are separate devices installed into a machine or machine part. The most sophisticated bearings for the most demanding applications are very precise components; their manufacture requires some of the highest standards of current technology.

Q: What are the 4 types of bearings?

A: They must offer high precision and durability, as well as the possibility of working at high speeds with minimal noise and vibration. This type of device is found in all applications such as, for example, the automotive industry, the aerospace sector, construction equipment, machine tools, etc. There are several types of bearings, the four main types are: ball bearings, cylindrical roller bearings, tapered roller bearings and needle bearings.

Q: What is the most common type of bearing?

A: Deep groove ball bearings are the most widely used type of rolling bearings. They are characterized by low frictional resistance, high speed, and can be used in machinery that experiences either radial loads or combined radial and axial loads. They are also suitable for applications with axial loads. Main applications include small electric motors, automotive transmissions, gearboxes in machine tools, and other components.

Q: What is another name for the main bearing?

A: Crankshaft bearings, also called main bearings, support the crankshaft in the crankcase. Essentially, bearings are there to guide the movement of two components against each other. As the crankshaft rotates and translates the up and down motion of the piston and conrod into a circular motion, it is held in the block by the main bearings. They consist of two semi-circular elements, each containing a bearing shell.

Q: What is one of the first signs of bearing failure?

A: The first sign of bearing failure is excessive vibration. Following this, the bearing will begin to heat up past acceptable levels and produce excessive noises, either high-pitched or grinding. Bearing contamination can occur in several ways. One of the most common ways is during relubrication maintenance. Poor seals can allow foreign contaminants to mix with the lubricant.

Q: What happens when bearings fail?

A: Bearings lower frictional forces caused by spinning components in machines. Bearing failure quickly increases frictional forces, leading to significant temperature increase and extreme wear and tear. The best method for using noise to indicate bearing failure is subjective. It's necessary to pay attention to the noises of a properly functioning bearing to know when something sounds wrong.

Q: Which is the most commonly used bearing material?

A: The most common material used to produce the load carrying components in precision ball bearings, roller bearings, and tapered roller bearings is 52100 chrome steel. These components are the bearings inner and outer rings, balls and rollers. The chemical composition of this steel has high carbon and about 1.5% chromium content. Using controlled processing and heat-treating methods the finished bearing components have high strength to resist cracking and a hard surface to resist subsurface rolling contact fatigue.

Q: How do you calculate bearings?

A: How do you calculate Bearings in Maths? To calculate bearing to degrees of a standard angle, you need to subtract the bearing angle from 90°. If your answer is negative, you need to add 360°. If the answer turns out to be more than 360° you need to subtract 360° from the answer.

Q: What metal are bearings made out of?

A: Chrome steel. Most ball bearings are made of a type of steel known as high carbon chromium steel, often called chrome steel. This is used for reasons of cost and durability. Bearings are also made from other materials such as stainless steel, ceramics and plastic.

Q: What is the best metal for bearings?

A: The most popular material is a chrome steel with about 1% carbon and 1.5% chrome. Martensitic chrome steel is very well-suited to ball bearing production. The properties of this material ensure stability, they are resistant and durable in continuous operation, all key elements required for these balls.

Q: How do you know if a bearing is worn out?

A: Noise: A humming, rumbling or growling noise that increases with acceleration or as the vehicle turns. A loud constant whining or grinding noise when the vehicle is in motion. Clunking noises when driving over uneven road surfaces. Looseness, excessive play in the steering wheel (vague steering).

Q: What are the codes on a bearing?

A: The first digit indicates the width or height series (dimensions B, T or H). The second digit identifies the diameter series (dimension D). The last two digits of the basic designation identify the size code of the bearing bore. The size code multiplied by 5 gives the bore diameter (d) in mm.

Q: What does the numbers and letters mean on a bearing?

A: A bearing's basic code is made up of its bearing series and bore number, which signify the bearing's type and bore diameter, respectively. The bearing series may consist of letters, numbers, or both to specify its diameter series, construction, and often its width series, as well.

Q: What is the most important requirement of a bearing?

A: Function 1: Reduce friction and make rotation more smooth. Bearings are used between these two components. The bearings serve to reduce friction and allow for smoother rotation. This cuts down on the amount of energy consumption. This is the single most important function of bearings.

Q: What does the D mean on a bearing number?

A: The basic designation contains 3 to 5 digits and gives general information about the bearing, describing its:
• Type
• Boundary dimensions – width (B, C, T or H), outer diameter (D), bore diameter (d), chamfer dimension (r)
• Series number
• Contact angle

Q: What does the first digit of a bearing mean?

A: The first digit of a bearing signifies the type of bearing. For Example: 6208: first digit being '6′ is a Single Row Deep Groove Ball Bearing. Inch bearings: first digit will be 'R'. After 'R', the size of the bearing will be given in 1/16th of an inch.

Q: How do you choose a bearing number?

A: Some people choose bearings based on the outside diameter of the bearing that matches the dimensions of the housing. Select the bearing of diameter series 0, 2, or 3 from the example of Table 3. If the bearing installation space is limited due to the down-sizing of the machine, select a bearing of diameter series 9.

Q: What does Z mean on a bearing?

A: 2 RS - Bearing with rubber seal on both sides. RS provides a better seal but more rolling friction than 2Z. RS - Bearing with rubber seal on one side, one side open. 2 Z / ZZ - Bearing with a metal seal on both sides. Z - Bearing with a metal seal on one side, one side open. E - Reinforced Design.

Q: What does V mean on a bearing?

A: A "V-shaped" marking on the outside surface of the outer rings of universally matchable single direction bearings indicates how the bearing set should be mounted in relation to the axial load. The "V-shaped" marking points toward the side face of the inner ring that can support axial load.

Q: How do I know what size bearing I have?

A: Measuring Bearings. It is sometimes necessary to measure bearings to determine the correct bearing type. You can measure the dimensions of a bearing by using a vernier calliper like the one below or measuring accurately with a ruler. All bearings will have a width, an inner diameter and an outside diameter.

We're well-known as one of the leading bearing manufacturers and suppliers in China. Be free to wholesale high quality bearing in stock here and get quotation from our factory. Contact us for more details.

FAG Angular Contact Ball Bearing, 521454, PEUGEOT Stabilizer Bar