Examples of agricultural machinery bearing

1. The agricultural  bearing  inner diameter of 9 mm below use the right end of the first digit  actual size. For example, bearing No. 18, its inner diameter 8 mm.
2. The bearing inner diameter of 10 - 17 mm  represented by fixed number. For example, bearing No. 100, 201, 302, 403 respectively, the inner diameter of the right end of the code of two digits is 00, 01, 02, 03, 10, 12 respectively for the inner diameter, 17 mm, 15 fixed digital representation.
3. The rotary bearing inner diameter of 20 - 480 mm (22, 28, 32, except) to diameter size in addition to 5 the number of representation.
4. The crossed roller bearings inner diameter over 500 mm (22, 28, 32) is expressed as a fraction, the denominator said diameter, molecular said bearing size series, type and structure form. For example, 30031/560 bearing, the inner diameter of 560 mm,and so on.
   

The purchase of agricultural machinery bearings

Bearing is a supporting member of various mechanical rotating shaft or the movable parts, widely used in agricultural automobile, tractor, diesel engine, motor, agricultural machinery and threshing machine. Purchase bearings bearings commonly used code, but the bearing code more complicated, if agricultural hand recognition bearing code rules, it is easy to buy.

 Precision spindle bearings are some commonly used standard models, code named 0, the tolerance level for the G (ordinary level), the general bearing of the first paragraph can not write, so the code to the basic code of 7 digits, said.

  To illustrate the bearing the meaning of code: 7002136 cases (135 series diesel engine crankshaftmain bearing), the basic code from right to left to identify. 36 two digits representing the light inside, it is calculated as 36 x 5 = 180 mm, 1 diameter series light,2 represents a type forcylindrical roller bearing, 00represents the structure form bearing no outer wall,7 series ofnarrow width. If the purchase of 7 digit other standard model bearing code can such push.

  Buy agricultural bearings multiple reference bearing inner diameter, inner diameter of bearings in the basic codewith the right end of the first, the second digit representation. Bearing inner diameter of sub standard and non-standard diameter, the difference between the integral multiples of non-standard diameter is not an integer or 5.

Tapered roller bearings are the development trend of China

Tapered roller bearings are widely used in mechanical support. Its function is to ensure that there is enough in the bearing life conditions, to support the shaft and shaft parts, and the relative rotation, swing movement and rotation of the frame and between the friction pairs to reduce as much as possible, in order to obtain the high transmission efficiency.

The principle and application of cross roller bearings‍ working

Tapered roller bearings are mainly bears radial, axial joint load radial based. Raceway angle bearing capacity depends on the outer ring of the bearing capacity, the larger the angle the greater. Tapered roller bearings with tapered inner and outer ring raceway, tapered roller are arranged in between. All lines of conical surface projection at the same meet the bearing axis. This design makes the wind power bearing‍ are particularly suitable to withstand complex (radial and axial load). Axial load bearing capacity is largely determined by the contact angle; alpha angle is larger, the axial load capacity is higher. Angle by calculating coefficients of e to say; the bigger the E value, the larger the contact angle, the axial load is bigger.

Tapered roller bearings are usually separated type, namely the cone assembly with roller and cage assembly composed of conical outer ring and inner ring can be installed separately (outer ring).

Tapered roller bearings are widely used in cars, rolling mill, mine, metallurgy, plastics machinery industry.

dental bearing‍ are the development trend of China

Since the founding of new China Chinese, tapered roller bearings industry make a spurt of progress has been made in the development of. However, at present, from product development, product quality level and production and manufacturing level, there is a big gap with world leading manufacturer of tapered roller bearings, the majority is in the imitation level, most of the general low-grade tapered roller Zhou Chengzhan. Therefore, in recent years, China has increased efforts in scientific research, obtained certain progress in product level.

At present, the following the development trend of China's circular cone roller bearings industry: increase the scale of production, improve the production investment; increase scientific research strength, strengthen the innovation, especially on the bearing life and reliability as the focus; constantly adjusting the broad product portfolio, enhance the tapered roller bearing structure design and Application technology research, expand the special high precision and high added value of cone roller bearing capacity; focus on the development of speed, accuracy, high reliability, long life, low friction, low vibration, low noise, high tech products bearing.‍

Bearing steel and direction of new technologies

Rolling bearing steel is mainly used in the manufacture of rolling elements and rings. Since the bearing should have a long life, high-precision, low-calorie, high-speed, high rigidity, low noise, high wear resistance and other characteristics, thus requiring bearing steel should have: high hardness, uniform hardness, high elastic limit, high contact fatigue strength, toughness must certainly hardenability in atmospheric corrosion lubricant. To achieve the above performance requirements, self aligning roller bearings steel chemical composition uniformity, the non-metallic inclusion content and type, carbide size and distribution, and other demanding decarburization. Bearing steel development to high-quality, high performance and multi-species overall direction. Bearing steel according to the characteristics and application environments are divided into: carbon chromium bearing steel, carburizing bearing steel, high temperature bearing steel, stainless steel and cross roller bearings special bearing materials.
To meet the high-temperature, high-speed, high load, corrosion, anti-radiation, and the need to develop a new range of bearing steel with special properties. In order to reduce the oxygen content of bearing steel, the development of vacuum smelting, ESR, electron beam remelting bearing steel smelting technology. The large quantities of wind power bearing steel smelting by arc melting, develop into various types of early foreign refining furnace plus. Currently, the use of a capacity greater than 60 tons beginning furnace + LF / VD or RH + casting + rolling bearing steel production process in order to achieve high-quality, high efficiency, low energy consumption purposes. In terms of the heat treatment process, by car bottom furnace, bell furnace developed into a continuous annealing furnace controlled atmosphere heat treatment. Currently, the longest continuous heat treatment furnace for 150m, processing and production of steel ball bearings organizational stability and uniformity, decarburization small, low energy consumption.

Four round Zhu roller bearings

Round Zhu roller bearings are separable bearings, the inner and outer rings and roller linear contact, friction coefficient, the higher speed limit. Double row cylindrical CARB bearing with a compact, rigid, large load capacity, by the load after deformation, etc., suitable for machine tool spindle bearing four row cylindrical roller bearings are used for the cold, the hot rolling mill and other heavy machinery.
This kind of agricultural bearings radial size, there are four rows of round Zhu roller bearings, compared with the same size ball bearings, a greater radial load carrying capacity, speed close to the ball and roller combined bearing, but can only afford radial force, axial force can not be used due to the inner wall, the inner and outer components (with full roller and cage) can be installed separately, this type of bearing is widely used in metallurgical industry, mainly used in cold hot rolling mill. Cogging or other work on the supporting stick mill.

How to maximize bearing life?

Theoretically centrifugal pump service life of rolling bearings is 20,000 to 80,000 hours, however, the actual life depends on many factors - premature bearing failure will lead to high cost of equipment downtime, and sometimes even lead to more serious consequences. NKE (Austria) bearing the company's experts offer some simple but useful tips to optimize bearing performance.
Satisfactory bearing life begins right bearing choice. From the outset, bearing the designer by selecting the correct bearing for different applications to extend bearing life and equipment performance. This process must consider many factors, such as load, stiffness, bearing life prediction, operating environment, and so on.
In principle, all bearings before installing should be kept in their original packaging. They need to stay in a clean, moisture free, relatively constant temperature environment. Rolling should stay away from dust, water and corrosive chemicals. Shake and vibration may never destroy the mechanical properties of the bearing, so the handling and storage process must avoid vibration.

Basically, all bearings must be kept level, because a long time after some heavier bearing placed vertically, may be deformed due to its own weight.
Pre-coated with grease (or sealed) slewing bearing manufacturer requires special care, because the oil after prolonged storage density will change after. So that when the bearing for the first time, there will be a certain degree of rotation noise. Therefore, these bearings should set aside time according to the FIFO principle to control.
Clean
Clean rolling bearing is very important. Turn the single direction thrust ball bearing ring and rolling element surface roughness is usually 1/10 μm, smooth surface damage so very sensitive to pollutants. Lubricating layer between the plane of rotation is generally 0.2 ~ 1 μm, a particle size greater than lubricant-type impurity will be subjected to excessive rolling element rolling to produce a localized pressure bearing steel, eventually cause permanent material fatigue. In addition to this, the external environment in the dust particle sizes up to 10 μm, can also cause damage to the bearings. Therefore, clean dust-free environment is critical to bearing storage and installations.
Fully ready to install
Bearings should carefully using a suitable tool installation and removal. Industry experts estimate that premature bearing failure in the case of 16% is due to improper installation. For large installations (for example, in the production unit) is concerned, usually strictly controlled conditions to install, you can install the device using a suitable linear plain bearings.
However, maintenance or replacement work environment is varied. Therefore, to ensure maximum bearing life, full preparation of the bearing mounting is necessary.
First, the relevant documents, such as drawings, maintenance manuals, brochures and other products require careful study. Next, all bearing components, such as shafts, distance rings, caps, washers, etc. must be kept absolutely clean and free from contamination. Neighboring parts of the state should be carefully examined.
Careful installation and removal
According to the different applications and bearing size and type, choose the appropriate installation method (mechanical or hydraulic) and tools. Here are some basic principles slim bearings installation:
1. Do not apply force on the rolling elements are mounted, which can easily lead to the rolling element and raceway local contact surface overload, leading to premature failure of the bearing.
2. Do not use any hard tools (such as hammers, screwdrivers, etc.) directly to knock on the bearing surface, which can lead to cracking or chipping bearing ring.
3. Compliance with the guidance of respected by others install equipment suppliers.
Approximately 90% of the rolling bearing from the device has never been removed where they too, will usually only larger bearings as scheduled preventive maintenance program and removed. And installation of a bearing as the bearing must be carefully prepared demolition, demolition process, to ensure that the adjacent parts such as shafts and bushings are not damaged. According to the bearing type, size and application to select the appropriate methods and tools.
Designers should be noted that a well-designed bearing location can greatly simplify installation and removal of bearings, thus reducing maintenance costs.
Correct proper lubrication
Lubricants can isolate metal bearing surfaces (such as rolling element bearing ring and bearing housing), thus reducing friction and protect the metal parts and the fight against pollution and impurities. There are a variety of lubricants (including greases, oil and solid) for selection of different operating conditions. Correct selection is very important to extend the bearing lubricant and equipment life.
Due to excessive rolling member rolling bearing lubricant experiencing long mechanical pressure, addition, subjected to high temperatures over time especially in wet or contaminated environments, the chemical nature of the lubricant will change. All this leads to decreased lubricating qualities. Therefore, to ensure the longest life, to regularly re-lubricate the bearings. Lubrication cycle depends on the operating conditions, such as temperature, speed, and the environment. Only pre-lubricated bearings or seals (also called "lifetime lubrication" bearing), bearing life is dependent on the lubricant life.
Lubricants must be properly stored in accordance with manufacturer's instructions, with particular attention to the lubricant to keep clean, free from contamination. Before each use, carefully check the quality of the lubricant, use stale or contaminated lubricants may cause premature bearing failure.
Condition monitoring / maintenance
Generally speaking, bearing very reliable, despite their limited lifespan. With the machine, like all other important components, they should be regularly inspected and maintained. Inspection and maintenance frequency depends on the operating conditions and the importance of individual applications for each device.
Because of the key role of bearings, condition monitoring function is recommended to join in its design phase. Important parameters of the machine is running, such as vibration and noise can be continuously monitored, preventive measures before unpredictable and costly equipment downtime.
Basis of good practice - Training
Practice makes perfect, but proper training is the foundation of practice. Chamber of renowned bearing manufacturers offer a variety of training programs for commercial, technical or workshop staff. If you have a basic knowledge of technical personnel in the course of processing the bearing, so you can avoid major mistakes. Design and product development engineers can optimize bearing design, maximize equipment performance, minimize life-cycle costs.
Bearings are usually pumps and other equipment in the important parts, although top quality bearings are very reliable, but to ensure they have the longest life, still have to pay more attention. Proper preservation, careful installation and removal, adequate lubrication and re-lubrication, proper condition monitoring, timely maintenance and, finally, to improve staff training, to improve bearing life and equipment performance are very important.

Precision Instrument Bearings

Rolling bearings used in all kinds of precision instruments, mostly inner diameter less than 10mm or 30mm outside diameter not greater than ball bearings. Due to the structure of instruments are more compact, so often used in special light or ultra-light size four point contact ball slewing bearing, and require bearings with high reliability, low friction, low noise, and resistance to corrosion, high temperature, magnetic and other properties.
l. Precision instruments bearing structure
(1) deep groove ball bearings and angular contact ball
Instruments used in the most widely used is the deep groove ball bearings and angular contact ball bearings. Its most notable feature is a compact, low friction, rotating flexible, and according to need to use in other aspects of the structure and the tolerance level is selected.
(2) top bearing
Bearing such a strong bearing capacity, low friction torque, often for precision instrumentation framework support bearings.
(3) combined bearings
This kind of bearing no inner or outer ring no, compact structure, small radial dimension, while the deviation due to reduced coaxial rings mounted on the shaft or housing generated by the improved miniature linear bearings and bearing parts stiffness, help to improve the tribological properties of the bearing. However, since the parts in contact with the rolling elements requires high precision, and often require special processing methods and detection equipment, the processing cost is increased. Therefore, these bearings are generally used only for high-speed devices requiring high torque and friction parts.
(4) Multi-ring bearings
Also known as polycyclic bearings. It is generally three to four rings, three balls. Intermediate rings for forced movement, which can be a swing, it can be work-axis continuous rotation opposite. Intermediate swing is called vibration thin wall bearings, called continuous rotation of the rotary bearings. As the middle rings of movement will make the work of the shaft to reduce the friction torque 7 / 8-9 / 10. These bearings are asking for is not high speed friction torque minimal occasions.
2. Magneto-precision bearings
The basic properties of magnetic motor thin section angular contact bearings for precision instruments, such as low noise, smooth running, low friction torque and wear-resistant, are built on the basis of high accuracy. For example, a computer disk drive bearing, its accuracy can not be rotated according to the original provisions of the radial runout tolerance, its tolerance should track pitch high-density disks adapt, usually provides less than 1/4 of the track width, otherwise it will cause the track error.
Also, take the following measures to meet the requirements.
① strict control of the bearing radial clearance to make it work in the pre-load.
② control starting torque and dynamic torque of the bearing, in order to meet the requirements of a magnetic motor control current.
③ guarantee bearing clean, clean work 100 clean bench in the occasional cleaning bearing assembly.
④ control bearing lubricant dust particles less than 0.1 microns in diameter, while also controlling with the growth in use of time, oil deterioration caused by dust particles increases and increased.
⑤ bearing magnetic fluid seal.
3. Ultra-high-speed ball bearings
Ultra-high-speed instrument bearings typically used in high speed cameras, high-speed dental drill, etc. used in bearings, operating speed of up to 105r / min or more, bearing diameter is about 3mm, the intermittent nature of the work is the work of the general requirements for hundreds of hours total working life. Based on the above operating conditions, the choice of these bearings and take appropriate action.
1) selection of bound or ring-type ball bearings.
2) use of small steel balls or ceramic ball bearing design.
3) bearing retainer for non-metallic materials have made white lubricating function.
4) bearing assembly dynamic imbalance rigorous testing required.
5) appropriate bearing preload.