"Eleventh Five-Year" bearing industry product development focus

During the "Eleventh Five-Year", bearing product development focus is mainly focused on the host supporting bearings and high-tech bearings.

     A focus on host supporting agricultural bearings

① automotive bearings: focus on the development of a new generation of high-end cars with wheel load bearing, water pump bearing, clutch release bearings, air-conditioning compressor bearings, constant velocity joints and heavy-duty truck axle bearings.
② motorcycle bearing: focus on the development of import substitution, export expansion motorcycle bearing.
③ household appliances bearing: focus on the development of household appliances with low-noise motor bearings.
④ railway vehicles bearing: focus on the development of quasi-high speed railway passenger cars, locomotives bearing and speed railway wagons bearing.
⑤ metallurgical and mining machinery marine crane bearing  focus on the development of plate mill roller bearings, bearing backing and high-speed wire rod mill bearings.
⑥ petrochemical machinery bearings: focus on the development of deep drilling rig, harsh offshore rig driller and bearings.
⑦ motor bearings: focus on the development of medium and large-scale low-noise motor bearings.
⑧ machine tool bearings: focus on the development of various types of CNC machine tool spindle, spindle machining center with precision bearings.
⑨ engineering machinery bearings: focus on the development of construction machinery with a long life, high reliability, cylindrical, conical and spherical roller bearings.
⑩ export bearings: focus on the development of high-tech, high value-added, access to foreign markets bearings.

Market analysis precision machine tool bearings

     Statistics show that in 2002 China's high speed bearing industry, the annual output of 2.8 billion units of various types of bearings, which, P5 grade precision bearings 62,364,000 units, P4 Extra Precision 729 000 units. Annual sales of products bearing the used machine tool manufacturing industry has 33 million sets.

     Analysis of market distribution in 2002 domestic precision machine tool bearings, precision machine tools for various types of P5 and above-bearing approximately 1.5 million units, which is used by about half of the machine tool spindle bearings and ball screws. P4 and above-grade super-precision bearings and paired bearings (mainly referring to the spindle bearings and ball screw bearings) about 15 million units.

     According to the machine tool industry, "15" planning objectives, to 2005, the annual output of 20 metal processing machines to 22 million units, including CNC machine tools to 3 to 3.5 million units (2003 CNC machine tools production and sales have exceeded 300 million units ), accounting for 15% of total production, domestic machine tool market share of 60 to 65%. As in recent years, the rapid development of China's machine tool industry, to 2005, the annual production of metal processing machines certainly more than the machine tool industry, "fifteen" planning objectives, in addition, with the development of modern machine tools to high-speed, high efficiency, composite direction, precision machine tools with precision miniature ball bearings capita will increase dramatically. Taking into account the huge transformation tools and repair market, the analysis and calculation predicts that in 2005 total of metalworking machine tools supporting the more than 50 million sets of bearings, P5 and above-grade precision bearings around 300 million units, of which approximately 1.5 million units for machine tools and a ball screw spindle. These bearings are larger amount of deep groove ball bearings, angular contact ball bearings, cylindrical roller bearings, angular contact thrust ball bearings and tapered roller bearings.

     Ball bearing spindle bearings and precision control as machine parts, P4 level and above super-precision bearings and bearing paired proportions and will greatly increase in the proportion of 20% by 2002 up to 2005 of 40% to 50% so, a total of about 700,000 units.

     In addition to psychological factors and branding, technical performance and reliability of the bearings are machine customers to choose the main bearings. If the technical indicators and reliability levels of domestic super precision bearings and bearings can be quite the next two years the market has great potential.

     To this end, the major domestic machine tool bearings supporting enterprises, such as: , Bearing Group Corporation, has begun to accelerate the pace of technological innovation, increase capital in processing conditions, testing methods, matching technology and reliability research investment, the main models of the small group of trial products and some types of mass-produced products have reached the international advanced level, import substitution is only a matter of time and scale of the problem.

     Although foreign precision machine tool self aligning roller bearings  excellent performance, high reliability, but there are expensive, long delivery times, service lag and other issues. In addition, the accuracy rating of P2-level super-precision bearings, are cutting-edge technology, these products are also classified as foreign to the country of export restrictions column. Domestic bearing production enterprises should seize the opportunity of rapid development of China's machine tool market, scale, accuracy, improve the stability of product quality, to meet the machine tool industry for bearing accuracy, high speed, low noise, high reliability, strict requirements At the same time, improve their own R & D capability, processing capacity, distribution networks and other comprehensive competitiveness.

   

Machine tool industry demand for bearings

     Rolling use on the machine is mainly used for the following three parts: spindle, ball screw and general drive shaft.

     Machine tool spindle angular contact ball bearing as the basis for spare parts, its performance directly affects the speed of the machine, rotary precision, rigidity, resistance to cutting chatter vibration, noise, temperature and thermal deformation, thereby affecting the accuracy, surface quality of machined parts and so on. Therefore, the performance of the machine must be equipped with a high-performance bearings.

     Accuracy of rolling bearings is generally divided into P0, P6, P5, P4 and P2 five grades for the accuracy of precision machine tool spindle bearings should be P5 level and above, and for CNC machine tools, machining centers and other high-speed, high-precision machine tools spindle bearing, you need to choose P4 and above the level of ultra-precision high precision ball bearings.

     Machine tool spindle bearings typically include deep groove ball bearings, angular contact ball bearings, cylindrical roller bearings, angular contact thrust ball bearings, tapered roller bearings and thrust bearings and other six kinds of structure types.

     With the rapid development of numerical control technology, "complex, high-speed, intelligent, sophisticated, green" has become the main trend of the machine tool industry technology development. Among them, the high-speed processing can improve the machining efficiency and shorten the processing cycle of the workpiece. This requires the spindle and its associated components to adapt to the needs of high-speed machining. Currently, the CNC machine tool spindle bearings are basically limited angular contact ball bearings, cylindrical roller bearings, angular contact thrust ball bearings and tapered roller bearings and other types of four structures.

     With the CNC machine tool spindle to speed the development of ceramic materials (mainly Si3N4 ceramic works) due to having low density, high elastic modulus, thermal expansion coefficient, wear resistance, high temperature resistance, corrosion resistance, excellent performance, making it manufactures high-speed ideal material for precision bearings. Ceramic bearings are more widely used, given the difficult process of ceramic materials, precision ceramic bearing rolling elements are mostly ceramics, chrome steel inner and outer rings still manufactured hybrid ceramic ball bearings.

     As a precision ball screw, efficient and sensitive transmission components, should be used in addition to high-precision screw, nut and ball, we must also pay attention to the choice of the axial stiffness, friction torque, high running accuracy of the bearing. Ball bearing used in the past two-way thrust angular contact ball bearings, tapered roller bearings, needle roller and thrust roller bearings, deep groove ball bearings and thrust ball high precision bearings  Currently, ball bearing using the most is the contact angle of 60 ° single row angular contact ball bearings and precision to P4 and above grade level is based.

     Rolling general machine tools installed in the drive shaft, the requirements and selection and general machinery drives bearing the same, just to meet the strength and durability requirements, speed does not exceed the speed limit can be specified in the bearing.

     Under normal circumstances, we mentioned refers to the machine bearing spindle bearings and ball screw bearings, precision machine tool bearings refers to the accuracy level above P5 and P5 screw spindle bearings and bearings.

China's bearing machine tool industry status and development trend

Machine tool industry as an important part of the machinery and equipment industry, plays an important role in the development of the entire national economy. Overall, from the industry, China's machine tool industry is currently in the best since 1992 development period, showing a shortage of good market situation. Especially since 1999 has entered a new growth for a long time, China's ferris wheel bearing tool industry output growth year after year, constantly adjusting product structure, increasing product quality. The following table since 1999, the output value of machine tool industry, metal cutting machine tool production, the growth in production of CNC metal cutting machine tools:
From a global perspective, China's machine tool consumption in 2002 compared with 2001 growth of 20.0%, accounting for the proportion of the world's total machine tool consumption rose from 13.6 percent to 19.2 percent, jumped from fourth in the world to first.
Meanwhile, in the case of the domestic machine tool industry production and management continue to maintain good momentum this year, China's machine tool imports also continued to grow, until the end of September, according to customs statistics, China's vertical mill bearing tool imports reached 2.96 billion yuan, increase of 35% over last year. Moreover, some well-known international companies have wholly-owned, joint ventures, etc. entering the country, the use of cheap labor costs and a variety of favorable conditions to seize the Chinese market. This fully shows that the machine is now modern manufacturing industry in international competition has gradually into the Chinese hinterland. China will continue to maintain its position as the world's first importer and consumer countries.

     Although in recent years, China's machine tool industry has made great progress, but in the current domestic and international machine tool market is extremely competitive situation, China's machine tool industry is even less competitive, mainly in the country is also a big consumer machine not machine power, but the machine has a large amount of low-level, product mix is still lagging behind, product innovation ability, machine reliability to be improved and so on.

     The level of the world's machine tool manufacturing concentrated expression in the development of CNC machine tools, production capacity, CNC machine tools has become a mainstream manufacturing equipment, a country has the number of CNC machine tools, the level has become the measure of a country's comprehensive strength, an important sign . To achieve our transformation from a big country for machine tool production powerhouse goal, we must accelerate the pace of adjustment, increase new product development efforts. For this reason, the machine tool industry, "15" plan proposes to focus on the development of CNC machine tools, thus boosting the industry to improve the overall level. Total goals formulated as follows: the 2005 National wind power bearing production to reach 25,000 to 30,000 units, the output value reached 65 to 70 billion, CNC machine tool market share reached 50% (by value). From the current situation, expected 2003 production target ahead of schedule.

Why China's high-precision bearings specifically import surge?

Related hot search term: Bearings Railway Bearings wheel bearings computer bearing mute bearing

In recent years, China's industry, especially the rapid development of the machinery industry. In 2002 the national industry average growth rate of 18.90 percent, 23.39 percent growth machinery industry. Eight categories of major machinery products to create the best pace of development since the founding, where vehicle production 3.477 million, an increase of 38.45% over 2001; the internal combustion engine 284 million kW, an increase 38.33%; metal cutting machine tools 232,000 units, up 19.15 percent. While precision spindle bearings industry is also developing rapidly, but still lagging behind the national industry and machinery industry. Especially focusing host supporting bearings relative lack of supply capacity, resulting in bearing imports soared.

Terms of production volume, China has a spindle bearing producing countries, but also far from bearing an industrial power. At present, varieties and specifications of products bearing a total of about 150,000 in the world, but China can only produce more than 20,000. In China's annual production of various types of bearings in common in the low end bearing account for more than 80%, all kinds of special, precision, high reliability, high-tech, high value-added products bearing account for only about 20%. And China's annual import large quantities of precisely this kind of bearing.

Industry experts point out that the existence of manufacturing standards with the international advanced level of products bearing a considerable gap, mainly in the performance, life and reliability. Such as the level of precision deep groove ball bearings Although quite close to the international advanced level, but there are still "two low and one poor", that is, low level of technology products (less variety, inconsistent quality, poor reliability, technology open to weak ), the low level of product manufacturing (process and equipment behind) and poor international market competitiveness. Such as railway bearings, a foreign country is 800,000 km of life, and we have only 500,000 km. At present, China can provide part of the quasi-high speed railway bearings, but all rely on imports of high-speed railway bearings. In addition there is a second generation, third generation wheel bearings, precision bearings drive computer hardware and software, mute motor bearings, etc., technology development capabilities are quite weak, low product quality and level of development can not meet the needs of the host.

At present, China's annual imports of ball and roller combined bearing as reached about 10 million units, but will also increase year by year, that share a considerable part of the host country support and maintenance markets fell into the others mouth. A piece of "cheese" Although tempting, but we lack the strength to share. To change this situation, industry experts believe that companies must change the current situation alone, together, focus on the integration of industry resources, technical resources, and enhance the overall strength. While continuing to strengthen the joint venture with the world's leading companies, the introduction of technology to improve the level of technology.

Angular contact ball bearing

* Angular contact ball bearings have a contact angle between rings and balls, standard contact angle of 15 °, 30 ° and 40 °
* The larger the contact angle the greater the axial load capacity * smaller the contact angle is more conducive to high-speed rotation * single row bearings can bear radial load and axial load combinations * DB, DF combination and double row angular contact ball bearing can withstand radial to load and axial load * DT combination applies larger axial load, less than the rated load bearing single occasion * high speed ball bearing with ACH small diameter ball a few more, mostly for machine tool spindle * angular contact ball bearings for high-speed and high-precision rotation * on the back of a combination of the two structures for single row angular contact ball bearing inner and outer rings, can bear radial load and axial load bearing * No filling slots have sealed the main applicable Cage:
* Pressed steel cage (separate bowl ...; S-shaped, crown-shaped double row ...)
* Copper alloy or phenolic resin cutting cage, synthetic resin forming cage main purposes:
* Single row: spindle, high frequency motors, gas turbines, centrifuges, small car front wheel, the differential pinion shaft * double row: pump, blower, air compressor, various types of transmission, fuel injection pump, Printing Machinery * Four-point contact ball bearings can bear radial load and axial load * single bearings can be replaced, or a combination of the back of a positive combination of angular contact ball bearings * applies to bear pure axial load or axial load larger synthetic ingredients * loads in any direction when such bearings can withstand axial load can form one of the contact angle (α), so the rings and balls always * at any point of contact with a contact line duplicitous mainly used to maintain frame:
Cutting copper alloy cage main purposes:
Aircraft jet engines, gas turbines.

Precautions precision bearing configurations

1. This type of spindle is usually passed through a pulley or gear drive torque. This means that the load on the drive end of the spindle is also quite large. Such applications for speed is not too high, more important parameter is the stiffness and load carrying capacity.
2. In order to improve the accuracy of the actual mating bearing installation, you must not make use of measurement methods and tools bearing deformation of the precision spindle bearings bore and outer dimensions of the actual mating surface precision measurements can be related to inner and outer diameters All measurement items to be measured, and the measured data to make a comprehensive analysis on this data, the precision worthy of the shaft and housing bore bearing mounting portion sizes.
3. take a small circle on the fixed interference fit condition to match the shape of the surface of both sides have high accuracy and less roughness, or cause installation problems and disassembling harder, also need to consider the thermal elongation of the spindle.
4. Note to match the mechanical fine Italian secret if it is not bearing the above requirements, often makes precision bearings occur several times larger than the original bearing error after installation, or even 10 times more errors completely ceases precision bearings, because to match the mechanical error is often not simply superimposed on the bearing error, but in an enlarged after different multiple additions.
5. Turn the accuracy requirements are not the same value, the product of its high level of accuracy precision rotation (inner diameter of the beating, the outer diameter of the beating, the side facing the raceway runout, etc.) value lower than the accuracy level of product requirements to be strict.
6. iso precision bearings in accordance with the classification criteria are divided into:. P0, p6, p5, p4, p2 successively higher grades, where p0 is the general accuracy of the other grades are precision level. Of course, different classification criteria, different types of bearings, their method for classifying different, but the meaning is same.

Precision bearings is the future direction of miniature bearings

Miniature bearings are generally used with the host supporting industries, including the automotive, appliance, medical equipment and other industries, the development of related industries will drive the demand of the industry.

China's auto market in recent years has maintained a trend of rapid growth, from car ownership per capita household income, per capita car ownership and other factors to consider, cars still in the incremental market, not into the stock market. According to Prospect Industrial Research Institute released "Chinese precision spindle bearings manufacturing industry sales demand forecast 2015-2020 and upgrade analysis report" shows that the automotive industry is still holding period of high growth, future growth of not less than 15%.
With the miniaturization of electric car process, the corresponding components of products is increasing. Thus, car-related components market will continue to expand. Automotive bearings of the development, will focus on safety, improve efficiency and reduce harmful substances. Car radiator cooling fan motor, wiper motor, exhaust gas recirculation system (EGR) valve frame and anti-lock braking system (ABS) as the representative of the pump motor and its application system is the main application field of miniature bearings.

In particular ABS spindle bearing, in the 1980s, is used only for luxury cars, after which advance to the direction of miniaturization and popularity as an important product safety measures, from the mid-1990s began expanding use. At present, the development of the multi-purpose vehicle spindle, safety direction, not only for the use of ABS brakes intermittently control, but also with sensors to monitor driving conditions even move to a different drive wheel braking force all around, from the overall control safe driving. The future development trend of miniature bearings such a system is upgraded ABS system, different manufacturers have different product names such as ESC, EPS, VSC and so on.
Development of the ABS system is a typical example of the development of automotive-related products. Miniature bearings future with the increasing safety and environmental requirements, will derive many new applications. Bearing market targeting hybrid and electric cars will try to create a new type of automobile-related products. In this development, the field of miniature bearings involved will continue to expand its precision will continue to increase, with the continuous development of China's auto industry, a huge space for development of domestic enterprises.

Market size of China's home appliance industry has expanded each year, the growth rate has declined in recent years, prospective Industry Research Institute expects the market size of China's home appliance industry will continue to expand year by year.
Appliances with miniature bearings representative products are vacuum cleaners and air conditioners motor bearings, mainly the outer diameter of 22mm motors. Vacuum cleaner is characterized by its number of revolutions of the motor up to 4-5 million revolutions / min, and 100 000 turn / min motor has also been used to market a large number of sales of vacuum cleaner. The air conditioner is a long time in the device for indoor use, low noise high demands. Currently there is a problem, the power lead to galvanic corrosion between the inner and outer ring of the bearing, the solution is to use only non-conductive ceramic balls, which will enhance the miniature bearings used in home appliance technology.

In recent years, the market size of China's medical device industry to maintain rapid growth. Prospect Industrial Research Institute expects China's medical device industry will maintain a growth rate of over 20%.
In medical devices, bearings use also involves many aspects, mainly for artificial dialysis blood pump, drug infusion pump, ventilator air pump and other equipment. These devices use the pillow in bed, it must be low-noise processing. An extreme example is the use of dental dentist drill, drill 40-50 ten thousand revolutions per minute, the doctor at the treble stimulus is hard to bear. Medical device bearing a major issue is that the bearing of the drug and the acid corrosion resistance, which is a subject of the bearing material can not be separated.

From the above applications bearing the future development trend shows, miniature bearings are mainly towards sophisticated, bass and other direction, so the future direction of development of precision bearings. Given the wide range of precision bearing applications, the development of all walks of life of the bearing accuracy, performance, reliability and other aspects of life and the increasingly high demand, the number of required more and more. However, domestic production of precision miniature bearings in is still the weak link, according to the statistics, since the rate of precision miniature bearings with only 40% of the domestic had to spend a lot of foreign exchange to import precision miniature bearings annually, of which the majority of high-speed electric main spindle bearings To rely on imports. In recent years, China's domestic machine tool industry, the automobile industry has developed rapidly, to adapt to the needs of product upgrades and import substitution, our precision miniature bearings market prospects.

Common five kinds of machine tool spindle bearings Features

1. Deep groove ball bearings

This class bearings generally only used to bear radial load, due to clearance is not adjustable, so commonly used in less precision, without pretension occasions, such as the common drilling spindles.

2. angular contact ball bearings

These bearings can support radial and axial loads, since the radial load will cause internal axial force, and hence, to install and use, and its configuration has "back to back", "face to face", "series" and " multi-joint ", and by tightening can increase the stiffness of the spindle. These double row ball slewing bearing have a contact angle of 15 °, 25 °, 40 ° three, including a contact angle of 15 ° B7000CY-precision angular contact ball bearings are designed for dedicated high-speed grinder spindle bearing designs, in addition to the internal structure of the bearing design changes, rings and rolling elements are made ​​of high-quality bearing steel slag. Cage material is phenolic cloth laminated tube, tolerance levels have 5,4 and 2. Therefore, these bearings have high rotational accuracy and speed limits, low friction, low temperature rise.

3. angular contact thrust ball bearings

Usually used 230,000 two-way thrust angular contact ball bearings, the contact angle of 60 °, by a seat belt lubrication holes, two shaft washer, a spacer and two ball and cage components. Select the appropriate height of the spacer can be assembled deck crane bearing having a desired pre-load.

Such bearings can withstand axial load, with good rigidity, the normal low temperature lubrication, high speed, and easy assembly and disassembly, as a new structure, currently used for grinding machines, lathes, boring, milling, drilling and other spindle on, often with the use of double row cylindrical roller bearings group with.

4. Double-row cylindrical roller bearings

These bearings can withstand greater radial load and allows a higher speed. Bearing in two rows of rollers arranged in a cross pattern, rotation fluctuation frequency than single row bearings double the amplitude decreased 70%. Such bearings are commonly used in two forms: NN30 / W33, NN30K / W33 two series bearing inner ring with ribs, outer separable; NNU49 / W33, NNU49K / W33 two series bearing outer ring with ribs, internal Circle separable, which NN30K / W33 and NNU49K / W33 series inner ring of tapered bore (taper 1:12), and a tapered shaft journal mate, axial movement of the inner ring, the inner ring can swell to reduce even small bearing clearance bearing preload. Cylindrical bore bearings usually thermal loading, using an interference fit reduced bearing clearance, or to achieve the purpose of pretension. Separable NNU49 series on the inner bearing inner ring mounted on the spindle generally made ​​after finishing the race in order to obtain high spindle rotation accuracy.

5. Tapered Roller Bearings

Both radial and axial loads, double row tapered roller bearings can withstand axial load. Tapered Roller sliding friction due to the large end and the inner wall between the child, the speed limit is often lower than the same-size cylindrical roller bearings. Hollow tapered roller bearings available oil cooling roller, so that temperature decreases, thereby increasing the allowable speed. But this thin wall bearings

 complex manufacturing process, machine tool lubrication system requirements are higher, generally used only for the special requirements of the horizontal spindle. 

How to choose the right bearing for the project?

Select the bearing type when fully grasp the conditions of use of the bearing is essential.
The following table lists the main analysis items:
Analysis Project Selection Method
1) The installation space can be accommodated in the bearing stiffness and strength of the bearing type shaft bearings installation space due to the focus on the design of the shaft axis, it is generally first determine the shaft, ie bearing diameter. But Rolling a variety of sizes and types of series, should choose the most suitable bearing type.
2) Load bearing load size, direction and nature of the [load bearing capacity with a basic load rating, said its value is contained in the bearing size table] bearing loads varied, such as the size of the load, if only radial load, axial load one-way or two-way, and so the degree of vibration or shock.
3) Speed ​​can adapt the mechanical speed of the bearing type [bearing speed limit speed limit value represented by the benchmark, its value is contained in the bearing size table] bearing speed limit not only take on the bearing type has limited bearing size, cage type, accuracy class load condition and lubrication methods, therefore, must consider these factors while selecting. Most of these bearings for high-speed rotation: deep groove ball bearings, angular contact ball bearings, cylindrical roller bearings.
4) having a truck mounted crane bearing type rotary precision desired rotational accuracy [dimensional accuracy and precision of the bearing rotation by bearing type has been standardized GB] spindle, gas turbines, and control of the machine requires high rotational accuracy, respectively, high speed and low friction, which should be used when more than five precision bearings. Generally use the following bearings: deep groove ball bearings, contact ball bearings, cylindrical roller bearings.
5) Just performance required to meet the mechanical rigidity of the bearing shaft type [when the bearing load, the contact portion of the rolling element and raceway will produce elastic deformation. "High rigidity" refers to the smaller amount of deformation of this elastic deformation] at the site of the machine spindle and the final stage of the deceleration devices, automobiles, to improve the rigidity of the shaft, it is also necessary to increase the rigidity of the bearing. Roller bearings under load deformation born smaller than ball bearings. Bearing preload (negative clearance) can improve rigidity.
This method is suitable for angular contact ball bearings and tapered roller bearings.
6) is inclined relative to the inner ring and outer ring of the bearing inner ring and the outer ring analysis produce relatively tilted factors (such as poor accuracy or the mounting error of the deflection, caused by the load of the shaft and the housing axis) and can adapt to this selection Conditions of bearing types. If the inner and outer rings relative inclination is too large, the bearing load due to internal damage produced.
Therefore, the bearings should be selected to withstand this type of tilt. In general, allows the tilt angle (or aligning angle) increments in the following order: plane bearing cylindrical roller bearings, needle roller bearings, deep groove ball bearings (angular contact ball bearings), self-aligning roller (ball) bearings.
7) The installation and removal of detachable regular inspection frequency and frequent assembly and disassembly disassembly methods using separable inner and outer rings of cylindrical roller bearings, needle roller bearings and tapered roller bearings is more convenient. Tapered bore spherical ball bearings and tapered bore spherical roller bearings through the use of fasteners or withdrawal sleeves can be easy assembly and disassembly.
After considering these factors, again select the most suitable bearing type. In general, the radial load crossed roller bearings capacity of the same inner diameter increments in the following order: deep groove ball bearings <angular contact ball bearings <cylindrical roller

bearings <tapered roller bearings <aligning roller bearings.

Selection Method precision machine tool spindle bearings

Rolling use on the machine is mainly used for the following three parts: the spindle, ball screws and general drive shaft. First, the rotation accuracy of precision rolling bearings for machine tool spindle system accuracy precision machine tool spindle bearings on the P5 and above level should be, and for machine tools, machining centers, high-speed, high-precision machine tool spindle bearings, P4 and above should be used Ultra precision bearings.
Rolling use on the machine is mainly used for the following three parts: the spindle, ball screws and general drive shaft.
First, the accuracy of precision machine tool spindle rotation system Machining centers, high-speed, high-precision machine tool spindle rolling mill bearing should be used in P4 and above-grade super-precision bearings. Machine tool spindle bearings as the basis for matching pieces, and its performance directly affects the speed of the machine, rotary precision, rigidity, resistance to cutting chatter vibration, noise, temperature and thermal deformation, thereby affecting the accuracy, surface quality of machined parts and the like. Therefore, high-performance machine must be equipped with high-performance bearings.
Precision spindle rotation system means that the machine is idling at a low speed manual or motorized rotating case, the measurement reference plane radial front spindle runout, section runout and axial movement of accuracy.Precision spindle system is mainly affected by the following factors Radial runout channel bearing rings, corresponding to the precision spindle bearings axis of the spindle system is radial runout, so that the complex part of the errors of these enantiomers on the surface being processed.
Diameter rolling element bearings inconsistencies and shape error will cause the spindle to produce a regular errors.
The axial end surface of the channel on the side of the pendulum will cause the spindle runout, axial play of the spindle for precision grinding machines, especially spindle bearing

 grinder influence was particularly notable, if tributary Mogou way using the process, will make the rejection rate improved significantly, the noise will be greatly improved.
Size and shape make errors bearing mounting face bearing raceway produce the corresponding deformation, so that the bearing inner and outer rings tilted so that the stiffness of the bearing in each direction is inconsistent, which will reduce the rotational accuracy spindle system. Gap adjustment nut, the spacer, the washer is required for grinding the end face and perpendicular to the axis of rotation of the shaft and the bearing installation accuracy corresponding, otherwise it will decrease the working accuracy of the bearing.
Second, the precision machine tool spindle lubrication and seal Earlier we mentioned the lubricant is an important part of the bearing arrangement, different lubrication, speed limit data bearing is different. In accordance with the design requirements lubricant replenish (High Speed ​​Precision Spindle grease filling amount is generally 10% to 20% of the bearing space), reasonable lubricant can reduce friction and wear shafting, extend the fatigue life of the bearing, frictional heat can be discharged simultaneously bearing system and play a role in cooling the bearing system; in addition to the grease, as well as liquid lubricating oil lubrication, oil mist lubrication and oil lubrication, etc. bearing system, oil lubrication system in which high-speed spindle abroad has been widely used, fuel oil lubrication, no pollution, and can significantly increase the DN value of the spindle system, and is able to intelligently control shaft lubricant requirements recharge.
Spindle structure design, lubrication and sealing must take different forms depending on the situation. Timely replacement of worn seals, seal lip contact with the rotating body at more than 15m / s is necessary to use non-contact sealing structure, high-speed precision machine tools they use a labyrinth, and the need to dump oil in place designed grooves, because contact Not only will seal sealing contact friction loss and overheating at, but will impact on the bearing system rotation accuracy.
Third, as a precision ball screw, efficient and sensitive transmission components, should be used in addition to high-precision screw, nut and ball, we must also pay attention to the choice of the axial stiffness, low friction torque, high operating precision bearings. Ball bearing used in the past two-way thrust angular contact ball bearings, tapered roller bearings, needle roller and thrust roller bearings, deep groove ball bearings and thrust ball bearings. Currently, ball bearing using the most is the contact angle of 60 ° single row angular contact ball bearings, and precision grade is mainly to P4 level and above.

How to buy Agricultural Bearings

Bearing is rotating shaft of various mechanical or moving parts support, widely used in farm vehicles, tractors, diesel engines, electric motors, threshers and other agricultural machinery. Choose Common bearing code, but bearing code more complicated, if agricultural hand grasp identification bearing code of law, the purchase is easy.
Bearings are some of the commonly used standard model, codenamed "0" tolerance class "G" (ordinary level), the general agricultural bearings of the first paragraph can not write, so its more than seven-digit code representing the basic code.
To illustrate the meaning of bearing code: Example 7002136 (135 series diesel engine shaft main bearings), the basic code from right to left to identify. "36" within a two-digit representation of light, which is calculated as 36 × 5 = 180 mm; "1" represents the diameter of the series special light; "2" indicates the type of cylindrical roller bearings; "00" indicates the form of the outer bearing structure without ribs; "7" represents the width of the narrow series. If the machine hand to buy other standard models bearing seven-digit code can and so on.
Optional multi-reference bearing diameter bearings, tower crane bearing diameter in the basic code using the right end of the first, second digit indicates. Sub-standard and non-standard bearing bore diameter, the difference is not an integer or a non-standard inner diameter of the whole multiple of 5.
To facilitate machine hand purchase.
To illustrate:
① bearing diameter in 9 mm below the right end of the first digit is represented by the actual size. For example, the bearing 18, an inner diameter of 8 mm.
② bearing diameter of 10 - 17 mm is represented by a set number. Such as bearings 100, 201, 302, 403, an inner diameter of the right end of the two-digit code is respectively 00, 01, 02, 03, respectively, an inner diameter of 10, 12, 15, 17 mm fixed numbers.
③ bearing diameter in 20--480 mm (22, 28, except 32), in addition to the inner diameter of 5 resulting numbers.
④ bearing diameter of more than 500 mm (22, 28, 32), expressed as a fraction, the denominator represents the inner diameter, the numerator represents the size of the series, the type and structure of the deck crane bearing

. Example No. 30031/560 bearings, an inner diameter of 560 mm, the other and so on.

Precision Bearings configuration issues

   For some high-precision bearings, its configuration requirements are very high, today we have to introduce a configuration problem on precision bearings.
Traditional applications of precision machine tool precision spindle bearings are, depending on the machine spindle processes have different requirements. In general, the lathe spindle is used at lower speeds and larger cutting metal cutting load. This type of transmission of the driving torque of the spindle usually through the pulley or gear. This means that the load on the drive end of the spindle is also quite large.Such applications of the speed is not too high, and more important parameter is the stiffness and load-carrying capacity. A very common method is to install a working end of the spindle-row cylindrical roller bearings and a double row angular contact thrust ball bearings, while at the driving end of the spindle using a double row cylindrical roller bearings. This configuration ensures a long working life and excellent rigidity, to produce high quality parts. Moreover, the agricultural bearings

 can be operated stably in terms of kinematics is concerned, because the two types of bearings (radial and axial) were carrying the load applied to the spindle (in fact, in order to prevent angular contact thrust ball bearing bearer path to the load, the outer diameter with special tolerances foreign ensure it will never be able to contact bearing).
  In the design of these types of spindles (which is usually applied to the load is heavy), a rule of thumb about the axis of the bearing is located where the distance between the centers of the front and rear support bearings for the 3-3.5 times the inner diameter.In need higher speeds (ie, high-speed machining centers or internal grinding), you need to find a different bearing solutions. Obviously, you need to make some sacrifices in terms of stiffness and load capacity in these cases. High-speed applications usually by direct-motor and / or direct drive spindle coupling (the so-called motor spindle).

Imperative to build brand value in the bearing industry

     Ball and roller combined bearing industry growing at an average annual size of China's double-digit growth rate rapidly growing . However , in this era of brand fighting to survive in the industry , many enterprises of China's bearing industry is also ready to welcome the "brand era" come ready ? Let's listen to the China Bearing Industry Association executive vice president Wang Quanqing views.
    What is a brand?
    Good product allows you to value for money and good brand but allows you to value for money!
    This is a " brand era," said the first decade if we are laying the foundation for product quality , time after then , we should do the brand on the basis of the product , otherwise companies do not have a competitive advantage , profit margins than others , but You know, the average profit margin of China's bearing industry is only about 5% .Recalling the development course of China's thin section angular contact bearings industry , "15 " , "Eleventh Five-Year" , the whole industry is very significant technological advances , coupled with Bearing Industry Association, the industry engaged in a technical research, the life of the product, reliability, noise and materials technology gained tremendous progress, especially small , miniature bearings , Jiangsu and Zhejiang Provinces production of small Full complement cylindrical roller bearing and product quality comparable to Japan . But later , due to increasing competition among enterprises , some companies do not want to come up with a special technique to share with their peers , some slow progress .Products based on the brand building has a good supporting force , then move forward step can become a world-renowned brands. Brand well, pricing naturally went to their own hands.

agricultural bearings needle roller bearings

Why do so many industries need to needle roller bearings?

Needle roller bearings are widely used at present market is very hot, and in this process, the field of machine tools use some relatively wide.

Scope of application: this agricultural bearings‍ bearing needle roller bearings are used for gearbox, motorcycle, automobile, the small end of connecting rod. Gear. Because the cylinder temperature reducer, increase, so the bearing high temperature. With thin and long needle bearing roller (roller length is 3~10 times the diameter, the diameter is generally not more than 5mm), so the radial structure is compact, its diameter size and load capacity compared with other types of bearings at the same time, minimum diameter, especially for radial installation support results in limited size. According to the use of different occasions, can be used without inner ring bearings or needle roller and cage assemblies, the Double Row Ball Slewing Bearing‍ shaft neck surface and the surface of shell holes matched with a bearing directly as bearing inner and outer rolling surface, to guarantee load capacity and operating performance and have the same ring bearing, shaft or housing holes raceway surface hardness, the machining precision and the surface quality of bearing ring raceway and similar.                                                                 

LYHY precision spindle bearings Wheel Hub Bearing

In standard angular contact ball bearings and tapered slewing ring bearings‍ roller bearings developed on the basis precision spindle bearing, it sets bearing as a whole, with good assembly performance can be omitted clearance adjustment, light weight, compact structure, large load capacity, for can advance into the grease sealed bearings, seals and hub maintenance omitted from the outside wheel, etc., have been widely used in cars, Spherical roller bearings‍ and in the truck also has a tendency to gradually expand the application.

LYHY precision spindle bearings wheel bearing

2, If you hear noise emitted wheel bearing parts, first of all, it is important to find the location of the noise occurs. There are many moving parts may produce noise, but also may be some rotation member and the rotating member occurs without contact. If the confirmation is bearing noise, bearing may be damaged and need replacing.

3, because the front wheel bearing failure on thin wall bearings‍ both sides led to similar working conditions, so even if only one bearing bad, it is recommended to replace in pairs.

4, wheel bearing more sensitive, in any case need to adopt the right approach and the right tools. In storage and during installation, the bearing parts can not be damaged. Requires a large number of bearings pressed into the pressure, so the need of special tools. Be sure to reference vehicle manufacturers instructions.

5, the installation of the bearing should clean environment, small particles from entering the bearing will shorten bearing life. When replacing bearings to maintain a clean slewing ring bearings‍ environment is very important. Allowed to tap with a hammer bearing note bearing not fall to the ground (or similar improper handling). Before installing the shaft and the bearing housing should also check the condition of even a small amount of wear can also lead to poor fit, thereby causing early failure of the bearing.

6, on the wheel hub bearing unit, do not attempt to disassemble or adjust the wheel hub bearing seals unit, otherwise it would cause water damage to seals or dust from entering. Even ring and inner ring raceway are damaged, resulting in permanent failure of the bearing.

7, the ring is equipped with ABS unit has a magnetic thrust bearing ring, which thrust ring can not be a collision, impact or collision with other magnetic field. Remove from the box before installation, so that they stay away from magnetic fields, such as the use of electric motors or electric tools. When installing Angular contact ball bearings‍ these bearings, the road test by observing the dashboard ABS alarm pin to change the bearing operation.

8, equipped with ABS wheel hub bearing magnetic thrust ring, thrust ring mounted in order to determine which side, you can use a small light near the edge of something * bearings, magnetic bearings will be attracted by it generated. When installing a magnetic thrust will take the side of the ring pointing inside, is on the ABS sensor. Note: Incorrect installation may lead to functional brake system failure.

9, many of the bearings are sealed, this type of bearing is not needed throughout the life of the grease increases. Other non-sealed bearings such as double row tapered roller bearings in the installation must be added grease. Because different lumen size of the bearing, it is difficult to determine how much of the added fat, the most important thing is to ensure that the grease bearing if too much fat, when the bearing is rotating, the thin section bearing‍ excess oil will bleed. General Experience: During installation, the total amount of oil to account for 50% of the bearing clearance.

10, install the lock nut due to the different types of bearings and bearing housings, the size difference between the torque is great. Note reference to the relevant instructions.‍

marine crane bearing Precautions

Wheel Bearing worn or damaged wheel bearing or hub units will happen to your vehicle and the cost of higher anachronistic failure in traveling the road, or even damage to your slewing ring bearings‍ safety. Wheel bearings in use and installation Please note the following:

1, in order to ensure maximum safety and reliability, it is recommended that you no matter how long the age of the vehicle should always check the wheel bearings - note bearing for wear early warning signals: including any friction noise when rotating or turning wheel suspension combination when the deceleration is not normal.

Rear-wheel drive vehicle is recommended for the thin wall bearings‍ vehicle to 38,000 km is to deal with the front wheel hub bearing lubrication. When replacing the brake system, check the bearing and replace the seal.

marine crane bearing Wheel bearings

Wheel bearings are used in automotive axles for load-bearing and rotating at the hub of providing precise guidance components, both axial load and radial load, is an important part of the car load and rotation.

Traditional automotive wheel bearing is thin wall bearings‍ composed of two tapered roller bearings or ball bearing combination, bearing installation, oiled, sealed and adjust the clearance is carried out in the car on the production line. This structure makes it difficult in a car assembly plant, high cost, poor reliability, and maintenance car maintenance, but also the need for bearing cleaning, oiling and adjustment.

Wheel Hub Bearing

In standard angular contact ball bearings and tapered roller bearings developed on the basis, it sets bearing as a whole, with good assembly performance can be omitted clearance adjustment, light weight, compact structure, large load capacity, for can advance into the grease sealed bearings, seals and hub maintenance omitted from the outside wheel, etc., have been widely used in cars, and in the truck also has a tendency to gradually Angular contact ball bearings‍ expand the application.

History

Car wheel bearings are used in pairs over a maximum single row tapered roller or ball bearings. With the development of technology, the car has been widely used car wheel unit. The growing scope and use of hub bearing unit has now developed to the third generation:

The first generation is a double row angular contact bearing components.

The second generation of the outer raceway for bearing a fixed flange bearing sleeve may simply be fixed with a nut on the axle. Makes the car maintenance becomes easy.

The third generation wheel hub bearing units are using lewing ring bearings‍ a bearing unit and ABS anti-lock brake system compatible. Wheel hub unit designed to have the inner flange and an outer flange, the flange is bolted to the drive shaft, the outer flange of the bearing mounted together.

agricultural bearings Angular contact ball bearings

Angular contact ball bearings: 7000C-type (α = 15 °), 7000AC type (α = 25 °) and 7000B (α = 40 °) of several types. This kind of bearing lock port on the outer ring, the inner thin wall bearings‍ and outer rings can not be separated in general, can withstand radial and axial joint load and axial load in one direction. Axial load capacity from the contact angle, the contact angle is larger, the ability to withstand high axial loads. This kind of bearing can limit the axial displacement in one direction shaft or housing.

Higher speed limit contact ball bearings can support radial load and axial load can also be subject to pure axial load, axial load capacity by the contact angle and the contact angle increases with the increase.

Single row angular contact ball bearings

Single row angular contact ball bearings can withstand axial load in one direction, when the radial load, will cause additional axial force must be applied to the corresponding reverse thin wall bearings‍ load, therefore, the kinds of bearings are generally used in pairs. Double row angular contact ball bearings can withstand greater radial load mainly radial and axial joint load and moment loads, it can limit the bi-axial displacement of shaft or housing.

LYHY precision spindle bearings magnetic bearings (see figure)

Using electric force, magnetic force of the shaft suspension sliding bearings. Electric field force is electrostatic bearing suspension with magnetic force suspension of magnetic bearings (see figure), electric field strength and the magnetic field strength is combined together suspension bearings. A bearing both electrodes have the poles in the circuit connecting the capacitor and inductor corresponding to each other tuner, the stiffness thin wall bearings‍ is much higher than the first two, and the corresponding displacement of the maximum force is very small. Electromagnetic bearings for shaft and bearing no direct contact, no lubrication, can be in a vacuum and over a wide temperature range, friction is small, not the speed limit (some speed up to 23 million rev / min line speed of up to three times the speed of sound), long life, the structure can be diversified. Static bearing requires a lot of field strength, the application is limited, use only a few meter. Magnetic bearings with a larger carrying capacity and stiffness, have been used in ultra high-speed trains, ultra high-speed centrifuges, hydro, spacecraft angular momentum flywheels, flow meters, density meter, power meter, vacuum pumps, precision current regulator and gyroscopes. With the development of magnetic and electronic technology, electromagnetic bearing ship loader bearing‍ applications are growing.

‍Electric force and electric field strength, electric displacement and the electrode area is proportional to the magnetic field strength and the magnetic field strength is proportional to the magnetic flux density and magnetic area. Select the appropriate electric or magnetic field parameters and geometry, get some bearing load capacity and stiffness. Electrostatic attraction between the magnetic attraction is inversely proportional to the square or the distance of the object, according to Hugh Aner theorem, this system is statically indeterminate statics, so in addition to the use of anti-bearing outer magnets or superconductors, in the electrostatic field or static magnetic field work bearing is thin wall bearings‍ unstable. For the magnetic bearing is stable, servo device or method must be used to adjust the circuit parameters control. The actual use of the general magnetic bearing by radial bearings, thrust bearings, servo-control loop, dampers, speed sensor or position sensor and other components.

marine crane bearing Magnetic bearing system

Magnetic bearing system is composed of the following five components: controller, rotor, solenoids, sensors and power amplifiers. One of the most critical component is the controller. slim ball bearing‍ Controller performance largely determine the performance of the magnetic bearing system. Control law controller determines the dynamic performance and stiffness of the magnetic bearing system, damping and stability.

The controller is divided into two kinds: Analog controllers and digital controllers. Compared with the digital controller analog controller has the following disadvantages :( a) adjustment inconvenient; (b) it is difficult to implement complex control; (c) can not simultaneously achieve two or more degrees of freedom control; (d) mutual change is poor, that is, different magnetic bearing controller must have a corresponding; large (five) power consumption, large volume and so on.

Magnetic bearing to be widely used, the difference between analog controller to adjust the performance of online say that it is one of the reasons, therefore, the direction is the slewing ring bearings‍ development trend of digital magnetic bearing. At the same time, to achieve intelligent magnetic bearing systems, analog controller is obviously difficult to meet this requirement. Therefore, to improve the magnetic bearing from the performance, reliability, and enhance the flexibility and reduce the volume controller, power, and in the future to network, intelligent direction angles, the controller must implement digitization. The last three decades has been the rapid development of control theory and made widely used.

Magnetic bearings, is a new high-performance bearings. Compared with conventional ball bearings, plain bearings and oil film bearings, magnetic bearings there is no mechanical contact, the rotor can reach very high operating speed, with a small mechanical wear, low energy consumption, low noise, long life, Thin section bearings‍ no lubrication, no oil pollution etc., especially for high-speed, vacuum, clean and other special environment. It can be widely used in machining, turbo machinery, aerospace, vacuum technology, rotor dynamics identification and other tests in the field, is recognized as a very promising new bearings.

agricultural bearings angular contact ball bearing life

High-speed precision angular contact ball bearing life of a great relationship with the installation, you should note the following

1 bearing should be installed in the clean, clean room, to carefully matching the bearing, the bearing spacer to be after grinding, while maintaining the inner and outer contour of the spacer premise spacer should be controlled in parallel 1um the following;

2 bearings should be cleaned before installing clean, slewing ring bearings‍ cleaning the inner slope upward, feel should be flexible, no sense of stagnation, dry, placed in a specified amount of grease, oil mist lubrication should be placed in the case of a small amount of oil mist;

3 bearing installation tool should be used exclusively, even by force, is prohibited beat;

4 bearing store should be clean air, non-corrosive gases, relative humidity less than 65%, long-term storage should be regularly rust.

Maintenance 1, when the bearing to run to a certain period of time (or Paul raised maintenance period), will be bearing all removed;

2, with a clean diesel or kerosene soaked with cleaning bearings, if technical conditions for the best open closures cleaning;

3, air dry after cleaning cleaning oil, visual inspection thin wall bearings‍ for damage;

4, with about a 150mm, angular contact ball bearing diameter equal to the inner diameter of the stick (preferably hollow tube), one end fixed to a bearing;

5, rapid rotation of the bearing by hand while the stick (wooden pipe) and the other end on top of the microphone audio amplifier or listening to the debate on the ear bearing rotation noise;

6, horizontal toggle the fixed bearing sticks, check bearing wear loose;

7, loose serious, turn the noise is too large, there is a serious defect FAG bearings should be eliminated, replaced with the same model;

8, take a bucket of the appropriate amount of grease (high quality yellow dry oil) with gentle heat to melt (not hot), will detect over-bearing into the bucket to soak no bubbles overflow. Bearing grease to cool before removing residual grease less. After cooling remove grease angular contact ball bearings, slim ball bearing‍ grease residue quantity. Determine how many of the remaining amount of grease required.

9, with a soft cloth or tissue paper to wipe the outside of the bearing grease will FAG bearings fitted to the pulley undisturbed security, maintenance work is completed.‍

LYHY precision spindle bearings Comparison

1. Rolling coefficient of friction than plain bearings, high transmission efficiency. The friction coefficient is generally 0.08-0.12 sliding bearings, rolling bearing and the friction coefficient is only 0.001 to 0.005;

2. Rolling has achieved standardization, slewing ring bearings‍ serialization, universal, suitable for mass production and supply, use and maintenance is very convenient;

3. Rolling bearing steel, and after heat treatment, and therefore, only the rolling bearing having a high mechanical performance and long service life, and can be used to save manufacturing sliding bearings

The price is more expensive non-ferrous metals;

4. Internal bearing clearance is small, high precision of the parts, and therefore higher running accuracy. At the same time, can increase the rigidity of the bearing pre-load by the method. This precision machinery is very important;

5. Some of rolling bearings can support radial load and axial load, so you can simplify the bearing support structure;

6. Due to the high rolling bearing transmission slewing ring bearings‍ efficiency, less heat, so you can reduce oil consumption, lubrication maintenance relatively easy;

7. Rolling can be easily applied to any spatial orientation of uranium.‍

marine crane bearing Needle roller bearings sound characterize CAUSE

Ye - ye loud rattle sound quality does not vary with changes in rotation speed changes (dust / foreign body) rotation speed of sound changes with the change (scratch) dust / foreign body orbital plane, ball, roller surface rough track surfaces, ball, roller surface scratches

Bared small bearings track surface, ball, roller wind power bearing‍ surface roughness

Bared - bared it off, and there is regular contact occurs with the ring section in contact with the holder and closures

Didi roar loud whining sound velocity changes due to rotation, size, height are changed. With specific speed rotation and the sound becomes larger. There is also an alarm or beep when approximate. Resonance, with the bad (bad shape axis) orbit orbital plane surface deformation, ball, roller bellows (large bearings as a mild tone, then normal)

Crunching feeling when the track surface scratches manually rotate the (rules) ball, roller scratches (irregular) dust / foreign body, the track surface deformation (part of the gap is negative)

When large bearing high-speed continuous rumbling sound track surface small bearings, ball, roller surface scratches

Woo - Om - electromagnetic sound instantly Thin section bearings‍ stops the motor when power off

Squeak squeak la la irregular occurrence (non-rotating speed variation and change), mainly for small bearings mixed with dust / foreign body

Jingle jingle tapered roller bearings and high-speed continuous tone rule large bearing small bearing retainer as compared with normal voice was clear and maintain good internal abrasion due to insufficient lubrication grease oil at low temperatures, such as discomfort → soft, insufficient load bearing operation.

Hey friends when the low-speed crash was more pronounced at high speed continuous tone maintain sound internal shocks, lack of lubrication. After reducing the internal clearance or preload different sound disappears. If so, then all of the roller, the roller occurs between the sub-impact sound.

Bang Bang loud impact sound low speed large metal thin large bearing (TTB) and so on. Torn rotator wheel deformation squeaky sound track

Bang bang sound cylindrical roller bearings are slewing ring bearings‍ mainly due to the rotation speed of change, you can hear the sound of large metal sound. After supplement lubricants, and sometimes stops. Lubricants too thick radial internal clearance is too large enough lubricant.

Sound bite sound  of metal between the roller bearing roller and rib bites inside the gap is too little lubricant shortage

Bared it sounds irregular bearing lubricant occurred in the small bubble burst tone

Jenna Jenna snapped snapped squeaky irregular mounting surface with slip ring key part of the squeak squeak sound, etc.

Sound pressure is too large orbital plane, roller ball surface roughness due to the friction surface of the track, rollers, ball deformation due to internal friction and the gap is too big.‍

agricultural bearings Angular contact ball bearing

Angular contact ball bearing is a bearing, it can support radial and axial loads. Able to work at higher speeds. The contact angle, the higher the axial load carrying capacity. High-precision and high-speed bearings usually take the contact angle of 15 degrees. In the axial force, the contact angle will increase. crossed roller bearings‍ Angular contact ball bearings can support radial and axial loads. Able to work at higher speeds. The contact angle, the higher the axial load carrying capacity. High-precision and high-speed bearings usually take the contact angle of 15 degrees.

In the axial force, the contact angle will increase. Single row angular contact ball bearings can withstand axial load in one direction, while the radial load, will cause additional axial force. And the only limit axial displacement in one direction shaft or housing. If paired installation, so that one pair of bearing outer ring relative to that wide side face of wide and narrow side facing the narrow end. This can avoid additional axial force, and the shaft or thin section bearing‍ housing to limit axial clearance within the range in both directions.

Angular contact ball bearing raceway for its inner and outer rings relative displacement on the horizontal axis, so it can support radial load and axial load - combined load (single row angular contact ball bearings can withstand axial load in one direction, So often adopted installed in pairs).

Cage made ​​of brass, synthetic resins, etc., depending on the bearing forms, and application conditions.

Angular contact ball bearings: 7000C-type (α = 15 °), 7000AC type (α = 25 °) and 7000B (α = 40 °) of several types. This kind of bearing outer ring of locking in the general inner and outer rings can not be separated, can withstand radial and axial joint load and axial load in one direction. Axial load capacity from Slewing drives‍ the contact angle, the contact angle is large, the ability to withstand high axial loads. This kind of bearing can limit the axial displacement in one direction shaft or housing.

agricultural bearings Thrust ball bearing

Thrust ball bearing is a separate type of bearings, shaft ring, seat ring and cage can, ball component separation. Shaft ring is cooperating with the spherical ball bearings‍ shaft collar, seat is compatible with the bearing hole ferrule, and there is a gap between the shaft; thrust ball bearings can only bear axial load, one-way thrust ball bearings can only bear axial loads in one direction, two-way thrust ball bearings can withstand axial load in both directions; thrust ball bearings can not limit the radial displacement of the shaft, low speed limits, one-way thrust ball bearings can limit a shaft and housing axial displacement direction, two-way bearing can limit the axial displacement in both directions.

Thrust roller bearings for axial load wind power bearing‍ mainly axial, radial joint load, but the radial load should not exceed 55% of the axial load. And other thrust roller bearings, such bearings lower friction coefficient, high speed, and aligning performance. 29000-type non-stick bearing symmetrical spherical roller, the roller can reduce the relative sliding and raceways at work, and the roller length, large diameter roller quantity, high load capacity, usually oil lubrication, individual low speeds available greased. In the design selection, preference should be given; 80000 Thrust cylindrical roller bearings, 90000 Thrust tapered roller bearings and needle roller thrust bearings AXK can withstand a one-way axial load, than the axial thrust ball bearings much greater load capacity and rigidity, axial occupy a small space. Thrust Crossed Roller Slewing Bearing‍ cylindrical roller bearings and thrust needle roller bearings for low speed applications, thrust tapered roller bearing speed slightly higher thrust cylindrical roller bearings.

LYHY precision spindle bearings Skateboard bearings

Skateboard bearings unlike those yo-yo as precise, because there are eight and four in lock bearing a plate above, for bearing the best eight are replaced, regardless of which axis before ringing off the hook, it is necessary to do so.

Bearing Cleaning

Skateboard bearings cleaning is very simple, spherical ball bearings‍ get the bearing from the board down with a paper towel to grease the bearings, wipe the stain, wipe the wheels inner wall also will change around the front and rear wheel bearings are smooth and look good. Probably every time, the use of high temperatures generated during rotation of the bearing plate, rubber wheels and bearings will close with a week to clean the walls, causing the wheel to change or replace the bearing so often inconvenient when removing the wheel bearing in accord, to avoid trouble can simultaneously clean the bearings.

Bearing oil

Remember to clean the oil, a wide range of oil, edible oil all OK, but it was said to buy back the bearing first soaked in gasoline in the week, so it is a waste of gasoline, buy back, after a week cleaning of use when the oil does not matter, bought back the bearing lubricant to prevent bearing rusty oil stored wind power bearing‍ in the oil with the board when you can send bearing, clean the first time when oil cleared on oils, these oils do not play lubrication, simply can not be heated like a cylinder of liquid only take effect the same amount, only to prevent rust, but is often difficult with the plate bearing rust.