Double row angular contact ball bearings are units with solid inner and outer rings and ball and cage assemblies with polyamide or sheet steel cages. Their construction is similar to a pair of single row angular contact ball bearings in an O arrangement but they are narrower to a certain extent.
The bearings are available in open and sealed designs. Due to the manufacturing processes used, open bearings can have turned recesses in the outer ring for seals or shields. Sealed bearings
are maintenance-free and therefore allow particularly economical bearing arrangements.
Due to the raceway geometry and the two rows of balls, the bearing can support forces in both radial and axial directions. They are therefore particularly suitable for use in pumps and
agricultural machinery. Furthermore, double row angular contact ball bearings are used in applications including conveying equipment, packaging equipment, elevators and compressors.
The angular adjustment facility of angular contact ball bearings is very limited. The adjustment angle should not exceed 2.
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Almost every brand has solid grease bearings, NSK calls molded oil bearings, SKF calls solid oil bearings, China CoatMaster Solid oil Bearings, solid oil is an oil-saturated polymer matrix that completely fills the free space in the bearing, encapsulating the rolling elements and cage , the polymer material has a porous structure with millions of micropores to hold the lubricating oil, since the pores are very small, the oil is retained in the material by surface tension.
When the oil-filled polymer material is pressed into the bearing, very small gaps are formed around the rolling elements and raceways, allowing the bearing components to rotate freely, and the oil that seeps into the gap provides good lubrication for the bearing from the start. This design has advantages over traditional lubricated oil bearings.
Solid oil bearings are designed for practical applications with moderate to high humidity and occasional exposure to water and other contaminants. Bearings using solid oil are lubricated for life and cannot be relubricated.
Solid oil bearings inject polymer materials into the bearing in the form of a mold. The polymer material absorbs saturated lubricating oil. The polymer material forms a small gap around the rolling elements, cages and raceways so that the bearing can rotate freely.
The unique design of the solid oil bearing can provide a steady supply of lubricating oil to the bearing. When a metal surface, such as a raceway in a bearing, slides over solid oil, it is covered with a uniform film of oil, and then, with only modest increases in operating temperature, the oil is pushed against the surface of the polymer matrix, polymerizing This “low” oil in the polymer matrix is because oil has a higher coefficient of thermal expansion than the polymer matrix, and because the viscosity of oil decreases with increasing temperature, excess oil reabsorbs when the bearing stops operating into the polymer matrix.
Solid oil prefills the bearing with more available lubricant. Solid oil bearings contain two to four times as much oil as conventional grease-lubricated bearings because the bearings are completely filled with solid oil, whereas grease-lubricated bearings typically only fill about one-third of the free space with grease.
Solid oil bearings keep out contaminants. Since the solid oil completely fills the bearing cavity, it is difficult for contaminants to reach the bearing contact surfaces. In highly polluted environments, CoatMaster recommends filling the free space in the housing with a suitable grease to provide an additional layer of protection.
Solid oil bearings require no seals and no relubrication. Solid oil contains a large amount of oil and is reusable so relubrication is not required, also solid oil bearings hold the lubricant inside so there is no need for seals to keep the bearing lubricated even on vertical shafts however, if If the unit already contains seals, the seals should be retained to prevent contamination.
In most applications, standard greases and oils provide equal amounts of lubrication to the bearings, however, in applications where relubrication of the bearings is not possible, solid oil bearings are a good solution, solid oils can also be effective In applications where high levels of contamination lead to premature bearing failure, solid oil is actually a 2-in-1 solution, providing lubrication to the bearing and an extremely effective seal by completely filling the bearing cavity.
For best performance in wet environments, it is strongly recommended to use solid oil bearings with integral contact seals whenever possible, when combined with solid oil and contact seals, the sealing capability is increased, while the solid oil acts as an axial support, preventing sealing Comes off and opens under pressure.
Application of Solid Oil Bearings
Solid oil bearings are widely used in harsh environment applications such as pellet mill equipment, steel mill rolling mills, glass factories, boiler equipment, kiln kiln cars, dirty or wet, corrosive chemicals, very cold, strong centrifugal forces, shafts, Difficult to maintain, oscillating motion, applications with high cleanliness requirements.
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On December 13, 2022, Luoyang Bearing Research Institute Co.,Ltd successfully completed the installation and application of the first domestically produced self-aligning roller bearing for wind power main shafts with the largest size.
This set of wind power main shaft bearings 240/1180 (self-aligning roller bearings), with an inner diameter of 1180mm and an outer diameter of 1660mm, can meet the needs of main shaft bearings for 5-8MW land-based wind power generators.
The main shaft bearing of wind power is the core component of the wind turbine. In addition to being affected by the wind load in the wind turbine, it also bears the gravity load of the main shaft and the impeller. The working conditions are complex, and it needs to have good impact resistance, flexible centering performance, Excellent raceway fatigue resistance.
By overcoming heat treatment deformation, controlling the internal structure of materials, cold working dimensional accuracy, optimizing rolling body modification and special surface treatment, ZYS Bearings can solve boundary friction and lubrication after the intervention of external pollutants, effectively ensuring the long life of spindle bearings for more than 20 years and high reliability requirements.
In recent years, in terms of new product research and development, Luoyang Bearing Research Institute Co.,Ltd has successively developed the first domestically produced 4.5MW, 7MW, and 10MW main shaft bearings (single-row tapered roller bearings) for installation and application. At the same time, the high operation and maintenance costs of wind power main bearings The characteristics of wind power main shaft bearing residual life prediction system was developed.
In terms of industrialization, ZYS Bearings has realized batch supply of main shaft bearings for 5-7MW double-fed models (spherical roller bearings) and semi-direct drive models (tapered roller bearings).
Since the upgrade of management in June 2022, ZYS Bearings has increased its investment in the industrialization of wind power bearings. Currently, it has an annual production capacity of 1,500 sets of wind power main shaft bearings, yaw pitch bearings, gearboxes and motor bearings. In the future, Axis Technology will continue to innovate in science and technology to help achieve the goal of “double carbon”.
https://www.china-bearing-manufacturer.com/wp-content/uploads/2022/12/20221211085301.png557556chinabearingadminhttps://www.china-bearing-manufacturer.com/wp-content/uploads/2019/11/CoatMaster-1.pngchinabearingadmin2022-12-17 20:25:062022-12-17 20:25:06ZYS successfully completed the installation of SRB wind power main shaft bearing
On October 24, 2022, the anti-fatigue life test of key components of aero-engines carried out by the Beijing Institute of Aeronautical Materials exceeded 50,000 hours, marking a new breakthrough in China’s high-end equipment manufacturing technology.
The key component of this fatigue test is the aero-engine main shaft bearing independently developed by China. The fatigue life of the equivalent accelerated test on the tester did not fail for 50,000 hours, setting a new record in China.
Tang, senior engineer of Beijing Institute of Aeronautical Materials: The aircraft has to fly for thousands of hours. If the bearing fails, the engine cannot be used. It is the center of the engine. The test simulates the working conditions of the aero-engine. So far, the accelerated equivalent life has not failed for 50,000 hours, and the test is still in progress.
According to reports, during the operation and service of high-end equipment such as aircraft and high-speed railways, key components will experience fatigue, cracks and fractures, resulting in product failure, which is a major problem in the world’s engineering field.
Through technical research, Chinese researchers have independently developed a number of key technologies for anti-fatigue manufacturing, established an anti-fatigue manufacturing technology system, solved the problem of fatigue failure of key components, and laid a more solid foundation for the comprehensive autonomy of China’s high-end equipment.
Zhao (researcher of Beijing Institute of Aeronautical Materials) Said: Our anti-fatigue manufacturing technology can do almost all key components. The life and reliability of equipment are reflected by key components. With key components, high-end equipment can be made. Therefore, the overall improvement of China’s manufacturing technology has reached three limits: limit life, limit reliability, and limit weight reduction, which means it is at the international leading level.
Fatigue, wear and corrosion are the three major problems in mechanical engineering manufacturing recognized by the world.
The so-called fatigue refers to the process in which the material gradually produces local permanent cumulative damage in one or several places under the action of cyclic stress and strain, and then cracks or suddenly breaks completely after a certain number of cycles. In layman’s terms, it is like an iron wire. After repeated bending, it will become hot until it breaks, which is caused by fatigue.
The development of the “fatigue” problem can be traced back to 1830. Although after nearly two hundred years of research and exploration, today, the “fatigue failure” problem still ranks first among the three major problems. Because wear and tear can be prevented in advance through early warning, corrosion can be extended through trimming and protection, and fatigue is sudden breakage without any warning, which can be said to be impossible to prevent.
“Forming” manufacturing technology is the first generation of engineering manufacturing technology in the world. It has been passed down for a hundred years. It pursues “form and position precision” and aims to develop in the direction of “near defect-free”, but it does not solve the fatigue problem, resulting in the existence of key components. It has prominent problems such as short life, poor reliability and heavy structure.
From 1948 to 1970, the United States, with the strength of the whole country, researched and invented the second-generation manufacturing technology – “Surface Integrity” manufacturing technology, which is an interdisciplinary technology of “Cutting + Fatigue”. The surface of the components is strengthened, and the fatigue strength is improved to be sensitive to stress concentration, so as to prolong the product life. This technology has given the West a monopoly in high-end manufacturing, but the problem of fatigue has not been resolved, and the world’s manufacturing has not been upgraded and transformed.
Key components are the core of high-end manufacturing, mainly including transmission components, such as gears, bearings, etc.; rotating components, such as blades, wheels, etc.; and main load-bearing components, landing gear, butt bolts, etc. Academician Zhao, who has been engaged in aerospace materials research for a long time, believes that the key component is the integration of the three technical systems of design, manufacturing and materials. Primary failure mode.
Bearings are called the “joints” of the industry. High-performance bearings and gears are key components in mechanical systems. They are widely used in helicopters, aero-engines, racing cars and other precision machinery fields. important factor in sexuality.
In the 1960s, the United States introduced the double vacuum melting technology into gear steel, which solved the key problems of the transmission system. The life of the aviation spindle bearings they manufactured was thousands of hours or even tens of thousands of hours. To this end, five companies in the United States and the West have monopolized 80% of the world’s high-end bearing market and 100% of the aviation and high-speed rail market for more than 50 years. At that time, China’s high-performance gear bearing steel technology was very backward, and the life of aviation main bearings was less than 200 hours, which severely restricted the development of aero-engines, helicopters and other weapons and equipment and high-end mechanical products.
In 2009, the relevant national departments deployed the major project “Basic Research on Anti-fatigue Manufacturing of High-strength Anti-fatigue Aeronautical Components”, requiring the study of a verification piece to evaluate whether the anti-fatigue manufacturing theory and method are available. Because the main bearing of the aero-engine is the most important and difficult key component, the team of Academician Zhao selected a main point main shaft bearing, which can not only complete the verification, but also solve the problem.
In the next 13 years, Academician Zhao presided over the purification research of new bearing gear steel M50NiL. Through the process routes of “purifying raw materials, refining outside the furnace, VIM+VAR double vacuum smelting, and pulling the billet out of the pier”, the purity of M50NiL has exceeded the international leading level. He also designed a case-hardened stainless gear bearing steel composition system, bringing gear bearing steel to ultra-high strength, high toughness and ultra-high hardness levels for the first time.
On July 28, 2021, the aviation main bearing using the new bearing gear steel M50NiL and the most advanced products in the world were “competed on the same stage” in the anti-fatigue test. The ball life of China’s main bearing reached one million hours, 15 times higher than that of foreign products; Under the maximum load of 1.6 times the load spectrum, the accelerated test life (conversion) exceeds 30,000 hours without failure, breaking the international record of 20,000 hours without failure of similar products. The relevant national departments have successfully accepted and passed the basic research project of anti-fatigue manufacturing, including five mechanisms of anti-fatigue manufacturing, four methods of anti-fatigue manufacturing, and technical standards such as 100% increase in fatigue strength and 100 times increase in fatigue life have been completed. This is an epoch-making milestone, and another world record in the mechanical engineering manufacturing industry was born!
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NSK has developed ROBUSTGRD, an environmentally friendly grease lubricant that improves seizure resistance and contributes to higher productivity and long-term stable operation of machine tools.
ROBUSTGRD improves seizure resistance and reliability in machine tools using cutting fluid and enables the adoption of environmentally friendly grease lubrication in applications typically covered by oil-air lubrication.
Production of ROBUSTGRD will begin in spring 2023, and NSK is targeting 4 billion yen in sales by 2026.
NSK will be exhibiting the new grease at “JIMTOF 2022 The 31st Japan International Machine Tool Fair” to be held at Tokyo Big Site from November 8-13, 2022.
Background
Oil-air lubrication is widely used in machine tools for its excellent lubrication performance. However, oil-air lubrication uses a large amount of compressed air and consumes a lot of electricity, so there is a need to reduce power consumption to reduce running costs and pursue carbon neutrality.
Grease lubrication does not use compressed air, leading to energy savings compared to oil-air lubrication, but reliability improvement has been an issue.
In the development of the new grease, NSK aimed to further enhance reliability while enabling more machining applications to use more environmentally friendly grease lubrication.
Product Features
1. High Seizure Resistance
Optimized grease composition to achieve 5 times higher* seizure resistance compared to our conventional grease.
* Under accelerated test conditions of approximately 3 times the typical usage conditions
2. High Reliability in Machine Tools Using Cutting Fluid
Previously, a concern of grease lubrication was that cutting fluid or coolant could infiltrate the bearing, causing the oil film to break and adversely affect lubrication performance. The newly developed ROBUSTGRD maintains the protective oil film by reducing the adverse effects of cutting fluid or coolant that enters the bearing.
Product Benefits
Improved seizure resistance and reliability in machine tools using cutting fluid or coolant enables the adoption of grease lubrication to reduce power consumption of machine tools. In addition, the increased reliability contributes to improved productivity and long-term stable operation.
About NSK
NSK began its journey manufacturing the first bearings in Japan in 1916, and has since developed into a global organization researching, designing, and manufacturing Motion & Control™ solutions essential for mobility and industrial applications. NSK is the top supplier of bearings in Japan and is the third largest supplier in the world by market share.
Our responsive products and technologies enhance automotive performance and industrial productivity while reducing energy consumption to unprecedented low levels. In the early 1960s, we set our sights outside Japan and have established over 200 business locations in 30 countries alongside a vast network of joint ventures and partnerships in all corners of the world.
NSK Corporate Philosophy
NSK contributes to a safer, smoother society and helps protect the global environment through its innovative technology integrating Motion & Control. As a truly international enterprise, we are working across national boundaries to improve relationships between people throughout the world.
Thrust ball bearings are designed to withstand thrust loads during high-speed operation, and consist of a washer-like ferrule with a ball-rolling raceway groove. Since the ferrule is in the form of a seat cushion, the thrust ball bearing is divided into two types: flat seat cushion type and self-aligning spherical seat cushion type. In addition, this bearing can withstand axial loads, but not radial loads.
Stamped steel cages are the most commonly used thrust ball bearings. In addition, there are copper cages and other designs. For special purposes, there will be a full ball bearing design that does not require cages. This type of bearing is also called thrust deep groove ball. Bearings, we can produce different materials such as Miniature Thrust Ball Bearings, Chrome Steel Thrust Ball Bearings, Stainless Steel Thrust Ball Bearings, Ceramic Thrust Bearings, Plastic Thrust Bearings, etc.
SKF has released a new Hybrid Ceramic Deep Groove Ball Bearings for high-speed applications. The new bearings target applications such as traction motors, motors and drives for the railway industry. SKF has worked with three OEM customers.
The newly released lightweight cage helps to increase the limit speed by at least 60% compared to conventional hybrid ball bearing designs. In addition, the nylon cage also helps reduce friction, resulting in quieter operation and higher power density in the application.
Andreas Pichler, SKF commercial and project engineer, said: “The new cage design can effectively help our customers achieve higher power output and further reduce the size of the motor.”
By increasing the efficiency of the motor, the new hybrid deep groove ball bearing can reduce energy consumption, improve reliability and reduce total cost of operation.
The two-lobed cage is made of PEEK and PA66 and is 80% lighter than the same size brass cage. In addition to being quieter, the bearings can also operate at lower temperatures, extending grease life and extending relubrication intervals. This allows engineers more flexibility in design choices.
In addition, its limit speed is twice that of conventional nylon cages and 60% higher than brass cages.
Rigidly connected cage bars ensure the robustness of the cage, helping to extend service life in harsh conditions. The optimized cage design also eliminates radial deformation caused by centrifugal action, known as the “umbrella effect”, which typically occurs with jaw-type cages operating at high speeds.
The newly released hybrid ceramic deep groove ball bearing designs will target OEM equipment manufacturers in railway, construction vehicle, electric vehicle and industrial motor applications.
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Bearings are the basis of automobile transmission components, and are a very important part of the driving device in automobiles. They are called “joints of the automobile industry” and are used for power generation and transmission to support tire rotation speed.
Automotive Bearings have an important impact on vehicle performance. Bearings for automobiles must be of reliable quality, maintenance-free, long life and low noise. Once damaged, it will affect the driving of the whole vehicle. In terms of safety, the installation position of some bearings is very important, such as wheel hub bearings, which are designed to support the weight of the whole vehicle. Once a fault occurs, it will affect the safety of the whole vehicle. The most important thing about the automobile bearing is safety. In terms of comfort, high-quality bearings have a great impact on the smooth operation of vehicles. Low noise and maintenance-free are very important to user experience. Therefore, car manufacturers have strict quality requirements when selecting bearings.
Due to the advancement of electronic control technology, automobiles are also developing in the direction of practical performance such as low energy consumption, high performance, and easy installation. Therefore, as an important component for automobile support, rolling bearings must adapt to this development trend. The following is a brief introduction to the specific classification of automotive bearings:
1. Automobile engine
Engine ball bearing, condensing fan, automobile water pump shaft bearing, needle roller bearing for engine rocker arm, automobile generator bearing, automobile air-cooled fan bearing 608, 629, automobile tensioner bearing , Automotive clutch bearings, silicone oil fan bearings, automotive air conditioning compressor bearings
2.Automotive suspension system
Tapered bearings for truck axles and differentials
3. Wheel hub bearings
The first generation wheel hub bearing, the second generation wheel hub bearing, the third generation wheel hub bearing, double row angular contact ball bearing, double row tapered roller bearing, double row angular contact ball bearing with flange, double row angular contact ball bearing with flange, double Row tapered roller bearings With flange.
4. Automotive gearbox
Tapered roller bearings for automotive gearboxes, Cylindrical roller bearings for automotive gearboxes, Ball bearings for automotive gearboxes, Needle roller bearings for automotive gearboxes
EASIER bearings Automotive offers a comprehensive range of automotive bearings for trucks, trailers, commercial vehicles and passenger cars, designing and manufacturing bearings for European and Asian vehicles. EASIER’s high quality automotive products, guaranteed through continued control, are designed to withstand harsh conditions.
TAPERED ROLLER BEARING
Frequently used in truck axles. Tapered roller bearing is able to withstand considerable axial and radial loading. By enlarging the outer ring angle, the bearing ability to withstand the axial load increases.
BALL BEARING
That is one of the most popular type of rolling bearings. Ball bearing is widely used also in trucks – transmission, reduction gears and engines. We present ball bearing in accuracy class 6, closed type.
HUB BEARING
Used in the axles of commercial trucks. Hub bearings come with seals, greasing and mounting rings that are necessary for replacement.
HUB REPAIRING KIT
The set of two tapered roller bearings with seals and rings that are also used in the axle. All hub repairing kits come with seals, greasing, assembling and sealing rings that are necessary for replacement.
Thrust Ball Bearings, Thrust Ball Bearings with shell, Thrust Roller Bearings with shell.
DAC Series Wheel Bearings
Double Row Angular Contact Ball Bearing for passenger car wheels
With the development of the economy and the progress of the society, the requirements of the industrial industry for bearings are also constantly being upgraded. The new energy vehicle industry has developed rapidly in recent years. The amount of bearings used in new energy vehicles is less than that of traditional vehicles, but the quality of bearings is affected. The requirements are higher, and Chinese-made bearings are also deploying the new energy automobile bearing industry. I believe that the world industry of automobile bearings will have a new situation in the future.
https://www.china-bearing-manufacturer.com/wp-content/uploads/2022/08/China-Automotive-bearings-manufacturer.jpg500500chinabearingadminhttps://www.china-bearing-manufacturer.com/wp-content/uploads/2019/11/CoatMaster-1.pngchinabearingadmin2022-08-17 14:57:552022-08-17 14:57:55What are automotive bearings?
The belt tensioner is at the front of an internal combustion engine. A belt-driven outer ring mechanism, including a timing belt, is essential in the set. The tensioner provides tension to the belt, which drives from the crankshaft to the camshaft, alternator, air compressor, power steering pump, and water pump. The tensioner bearing is placed at the slack side.
A tensioner bearing consists of a base, tensioner arm, spring, and pulley. It provides pressure to a timing belt that drives other pulleys while easing the strain on that belt. The belt needs to run at a constant tension to ensure that it is always ensuring that the alternator has enough power to move the pulleys, which drive all these individual components. Other primary functions include:
Transfer driving force from crankshaft.
Prevent noise caused by an off-line belt.
Prevent the belt from slipping.
Keep the belt-driven mechanism compact.
A tensioner bearing must handle high temperatures, high-speed rotation, and belt vibration because of contiguity in the engine to make the direction of a belt change. These bearings are designed against different specifications from standard deep groove bearings. There are various styles according to engine types. Queen Jen produces four kinds of tensioner bearing: utilized, ball bearing, pulley type, and bracket assembled. Our R&D team develops timing belt tensioner bearings for engines of various car models. We care about the following features in our design:
Premium materials that ensure reliability and durability.
Resistance to both high and low temperatures.
Low torque to minimize the seal friction.
Optimal seal for preventing grease leakage.
Tolerance control for alignment
Functions
· To provide belt with tension
· To transfer driving force from crankshaft
· To prevent belt slippage
· To prevent noise caused by off-line belt
· To minimize space of belt layout
Tensioner and idler bearing consists of basic components like inner ring, outer ring, retainer, grease and seal. Pulley may be added to adjust rotation ratio. Bracket may be added to adjust location for adding tension. Races are one of the bearing component parts. It has grooved track for balls to locate. Outer race and inner race make a set. Inner race is situated on sub-assembly unit and outer race is set on housing. Pulley may be added on outer race to provide timing belt system with designed revolution rate. Rolling element is “ball” running between races. Retainer moving along with balls separates individual ball into position. Also grease has important role to reduce friction and oil seal serves to hold grease and shut foreign particles from intrusion.
These are used in the timing belt and auxiliary drive belt to adjust the belt tension or change the belt running path. EASIER’s bearings have a long service life even under high-speed rotation and high-temperature conditions, and their high-strength resin pulleys help to reduce the weight. The timing and auxiliary belts are equipped with idler bearings with pulleys and brackets attached to them. Of these, in the timing belt mechanism, the type with a slotted hole in the inner ring or a bracket for tension adjustment is sometimes called the “tensioner bearing,” and the type without an adjustment mechanism is sometimes called the “idler bearing.” Auxiliary idler bearings are also used in auxiliary drive belt mechanisms. EASIER Can manufacturer and supply Tensioner and Idler Bearings with competitive price and high quality.
Tractor bearings are mainly used in the field, the working environment is bad, and the continuous working time is long, which requires the bearings to be reliable in the use process, and work normally in the dusty environment,
Agricultural tractors are the work horses of the industry with drivetrain, engine, suspension and steering being key sub-systems Safety, availability and productivity are the underlying forces driving many of the industry trends, such as:
Automation, smart functionality and power management
Better efficiency which reduces frictional losses,
