Some knowledge elements imported deep groove ball bearing life

First, deep groove ball bearings are correctly installed, directly related to the accuracy of bearing life and performance. Therefore, installation and design department for bearing installation to fully research, analysis of the bearing structure, etc. in order to ensure normal operation of the double row ball slewing bearing:
Cleaning bearings and related components; this is very important, attention must be cleaned to prevent debris in them. Check the size and finishing the connected components; this requires some specialized tools to ensure the accuracy of the bearing installation. After installation check the bearings; check whether the bearing support, if there is the wrong place. Supply lubricants, require careful operation, it is important.
Second, deep groove ball bearings basic monitoring conditions:
Need some professionals, the bearings have regular checks, which can identify potential problems early will prevent unexpected machine stop, so that production can be safely carried out to improve plant productivity and efficiency. During use of the bearing, the basic external conditions should always be monitored bearing run, such as temperature, vibration and noise measurements, etc., so as to take preventive measures.
Third, the alignment deep groove ball ball and roller combined bearing, alignment:
These actions could accelerate fatigue and reduce bearing life, will damage the life of other machine parts. Furthermore, increased vibration and friction can significantly increase energy consumption and the risk of premature failure. However, after installing the bearing, if not carefully for alignment, alignment may lead to additional load bearing suffering, friction and vibration. Leading to premature failure of the bearing in advance, so it should be adjusted, alignment!
Fourth,deep groove ball bearing re-lubrication:
If deep groove ball bearings consider lubrication oil lubrication dominant. However, they can simplify the specialty grease around the bearing structure. In the course of the operation, deep groove ball bearings requires the correct re-lubrication, lubrication of the bearing assembly benign operation, in order to play well bearing function, first, to select the appropriate conditions of use, purpose of use lubrication method is the use of lubricating oil or grease lubricated bearings depends on the specific circumstances and given up!
Fifth,deep groove ball bearings to remove:
Use the proper tools to remove, which will help prevent damage to other machine components, incorrect technique may have to remove the bearing damage, if bearing reaches its end-use period of time, it should be replaced out. Although bearings can no longer be used, but the right to remove the original bearings, timely replacement of the new bearings, new stacker-reclaimer bearing for extended life can play a good role in promoting, so replacement of old and new, is very important, you need to check the operation of professional staff .

How to measure the operating temperature of thrust ball bearings

Thrust ball bearing temperature, generally by the bearing chamber outside temperature can be inferred that if the use of the hole can be measured directly thrust ball bearing outer ring temperature, the more appropriate.
Typically, thrust ball bearings with the four point contact ball slewing bearing operating temperature slowly began to rise 1-2 hours to reach steady state. Normal temperatures thrust ball bearings due to the heat capacity, heat capacity, speed and load of the machine and different. If lubrication, improper installation, the bearing temperature will be rapid-rise, there will be abnormal high temperature, when to stop running and take the necessary precautions.
You can always use the thermal sensor to monitor the thrust ball bearing operating temperature, and automatic alarm or stop to prevent burning shaft accident temperature exceeds a predetermined value.
Often expressed with a high temperature thrust ball bearings in unusual circumstances. Temperature is harmful to thrust ball mobile crane bearing lubricant. Sometimes bearing overheating can be attributed to the bearing lubricant. If the bearing temperature over 125 ℃ even move to reduce long bearing life. Causes high temperature bearings include: lack of lubrication or excessive lubrication, lubricant. Contains impurities, the load is too large, the bearing ring damage, lack of space, and high-friction seals and so on.
Thus, continuous monitoring of bearing temperature is necessary, whether measured bearing itself or other important parts. If you are under the same operating conditions, any change in temperature may indicate a fault has occurred.
Thrust ball bearing temperature measurement by means of regular thermometer, such as digital thermometers, bearing temperature can be accurately measured and determined in accordance with ℃ or Fahrenheit units.
The importance of thrust ball bearings, which means when it is damaged, can cause equipment downtime, so the best type of bearing temperature detectors should be installed.
Under normal circumstances, thrust ball wind power bearing lubricated or relubricated immediately after the temperature increase, and there will be natural for one or two days.

Training skilled bearing managers

Product quality, a process to ensure a scientific, but also have high-quality management personnel to implement. Antirust management is "prevention" and take preventive measures, will produce metal corrosion factor nipped in the bud, and which requires skilled, with high-quality management personnel.

First, truck mounted crane bearing managers are required to have anti-rust metal corrosion basic theoretical knowledge, have a certain level of expertise, the importance of anti-rust management have a full understanding, there is a high degree of responsibility, anti-rust process specification can conscientiously implement and carry out supervision carried out.

For example, requiring antirust level managers must have a college degree, a metal corrosion expertise, familiar with the bearing processing the entire process, all bearing rust can develop technical rules, with a production deal with and solve problems arise the actual ability, training and work instructions antirust members.

Owned manufacturing plant for rust prevention officer asked two must have a high school education, after induction by the technical department for their technical training, basic theoretical knowledge from rust-proof, rust-proof technology content and operation points and rust-proof materials during use detection and monitoring methods to the importance of anti-rust work, so that they improve their professional skills by learning antirust comprehensive system to enhance awareness of disease prevention, according to the company's leading technology can apply the knowledge learned documents, combined with the specific units case for the unit to work out specific antirust rules; each member of every able-rust-site inspections, monitoring the implementation of anti-rust process, the general anti-rust problems can be analyzed and timely processing solutions, that can not be resolved problems promptly report to their superiors technology sector, cooperative solutions; and is able to project accurately monitored regularly testing according to process requirements. So a team of professional technical and management training is very necessary.

Formulate scientific management methods

Management is a concrete manifestation of anti-rust management, saying no rules, no standards, good scientific management is an important means to ensure product quality. Antirust management including process management, cooling water management, anti-rust solution management, cleaning vertical mill bearing fluid management, anti-rust oil management and rust auxiliary materials management. Los axis using two anti-rust management system, at the level of anti-rust technology management department, responsible for the development and centralized management of anti-rust process, responsible for anti-rust auxiliary materials testing and inspection, is responsible for technical guidance rustproof member responsible antirust work for secondary management assessment, and rust-proof new technology, research and development and application of new technologies.

The difference between domestic and foreign rolling bearings

Our precision spindle bearings industry started construction in 1950, after half a century of development, has formed a relatively complete system of production and technology system, to become the world's fourth largest country rankings bearing manufacturer in Japan, the United States and Germany, and has achieved remarkable achievement. However, compared with the bearing industry developed countries, China's bearing industry, there are still a big gap. Main features:

One on varieties, different specifications of products triple row roller slewing bearing the world total of about 150,000, our total production to date only two thousand months, and mostly for generic products.

Second, the production capacity, China's current production is about bearing more than 2,000 enterprises, is 5 to 6 times in other countries around the world bearing companies combined. However, the annual output value of the country's only comparable to the United States ranked sixth TIMKEN (about 21 billion yuan); compared with the number one Swedish company, equivalent to only half of its annual output (about 40 billion yuan) of ; Compared with Japan, equivalent to only ten percent of its annual output.

Third, the dimensional tolerances and precision rotation, even though our country is close to self aligning ball bearing foreign brand-name level, but in terms of the size of the deviation of the dispersion, there are still a wide gap. In addition, the countries have already begun to study and application of "non-repeatable runout" This fine precision rotation indicators, and our research in this area is still blank.

Fourth, in the high-speed performance, the value of foreign brands of DmN 4 × 106mm · r / min, while China bearing only 2 × 106mm · r / min.

Fifth, the vibration, noise and different sound, Japan has launched a mute and ultra-quiet bearing, and our bearing vibration (acceleration) compared to the extreme levels of Japanese products, generally more than a difference of 10dB.

Sixth, in life and reliability, deep groove ball bearings, for example, foreign brands of life is generally calculated life of more than 8 times (up to 30 times), the reliability of more than 98% (or to pursue with the host and other life), and our general life of the bearing life calculation is only 3 to 5 times the reliability of about 96%.

Seven, in the special conditions of the bearing application technology, China's bearing is there is a considerable gap.

It is precisely because there are not enough of bearings from different specifications to performance quality and other aspects, therefore, not only in the export, the vast majority of low-end products, each bearing an average price of only about $ 0.4, does not have any technical competence, and In a number of important host country or areas, such as civil aviation aircraft, high-speed railway passenger cars, luxury cars, computers, air conditioners, and other major equipment imported type, essentially consists of imported bearings "domination." These industries or areas, and there is a pillar industry of the national economy or in the field.

Novel oil-bearing

Base metal inlaid solid self-lubricating high precision ball bearings are both a metal bearing characteristics and features of the new self-lubricating bearings lubricated bearings, a metal matrix load bearing, solid lubricant specially formulated lubricant.

It has a high carrying capacity, impact resistance, high temperature resistant, self-lubricating ability and other characteristics, especially suitable for heavy, low speed, such as swinging back and forth, or difficult to form a film of lubrication and equipment, but also afraid of flush and other acid erosion and erosion.

Users generally reflect the mosaic deep groove ball bearing not only fuel-efficient, energy-saving, and life expectancy is longer than ordinary plain bearings.

Mosaic self-lubricating composite material is a novel anti-extreme pressure solid lubricant material, a metal substrate and embedded substrate hole or slot solid lubricant paste composition. In the course of friction metal substrates bear most of the load.

By friction, holes or slots solid lubricant transfer to the friction surface and the friction surface to form a well-oiled, attached to a solid, uniform coverage of solid transfer film, greatly reducing friction and wear. With friction were embedded continuous supply of solid lubricant friction surface to ensure good lubrication of the friction pair of long runs.

Adjustable clearance design features of rolling ball bearings

The design features:

(1) manufacturing easy: Thanks to the adjustable intermediate links, so that parts of the process can be greatly relaxed tolerance zone size, the rejection rate also will drop exponentially. While reducing the accuracy of machine tools, the machining accuracy of machine tools in the general precision bearings possible. The technical level of the workers may be appropriate to reduce, with a certain economic benefits.

Convenient (2) assembling: the outer ring made after the split, you can easily adjust the radial wind power bearing clearance to the desired value, without the use of packet assembly method that is able to achieve high accuracy. Mounted on the shaft is also very easy to adjust without attaching other devices, simplifying the whole structure.

(3) to improve the situation by force: the double rows of rolling elements can increase the carrying capacity and can withstand axial force.

(4) reduce the types of parts: the outer ring made after the split, make rolling body covered in the fairway, so the cage can be omitted. This while reducing process, improve the carrying capacity, can be said to serve multiple purposes. Power Station Valve

(5) maintenance and repair easy: when the bearing clearance due to wear and tear caused by the ultra-poor, just appropriate to reduce the thickness of the shims can be reduced clearance, to restore the original accuracy, correspondingly prolong bearing life. In addition, when only the individual components of non-normal damage, can also be used to replace the damaged parts of the method to fix the bearing, or even the entire old as new, after all, a good way of reckoning. Deficiencies at 1.2

(1) increasing the inner cutting on the outer circumference, an externally threaded step. And easy to produce because of the presence of the thread stress concentration, while the heat 1P processing becomes difficult.

The axial dimension (2) of the flanged ball bearing is relatively large, and due to the randomness of the thickness of the adjusting washers have a greater volatility.

(3) for an outer thickened, so that an increase in material consumption.

Adjustable Rolling clearance presented here has the novel, reasonable structure, easy assembly, easy maintenance. Especially after the bearing outer ring from monolithic to modular axially split, so adjust the bearing clearance problems solved, for reference colleagues. The design can also be an extension of the idea to broaden to other types of bearing designs. The design of the case of non-standard bearing designs. There are many issues still need to explore deeper, deficiencies must be resolved. Truly eager to get peer guidance and help.

How to design an adjustable clearance rolling ball bearings?

Adjustable clearance rolling ball bearings design methods:

Rolling friction ball bearings for its small, start-sensitive, high-efficiency, high precision rotation, lubrication is simple, easy to replace and many other advantages and is widely used in the production and life. However, because the manufacture of high precision, complex process, the current standard of rolling bearings are used in jet production, by professional factory manufacturing. Since the original design between the spindle bearing inner ring, outer ring, rolling, etc. These rigid parts with little regard adjustable links, so important bearing precision index - the radial clearance depends mainly on machining tolerances to be guaranteed. Thus, even with a high precision machine to machine the bearing parts, due to the method of the inevitable accumulation of influence of the error, it is difficult to use directly by the assembly to achieve the required precision. Generally required by measuring the selection method with a packet assembler to assemble, but still finite precision, high prices make high-precision bearings. While bearing in the use of wear caused by the ultra-poor clearance can not be compensated, lowering real life, resulting in waste. With the development of production, the urgent need to address the technical issues. To this end, the author through analysis and research, to find the main factors bearing radial clearance precision. Then the structure bearing a reasonable design from the start, to design a new structure, the agricultural bearings radial clearance can easily be adjusted to solve the above technical problems. After trial, the better, are made with a brief introduction.

design ideas, works and concrete structures

As we all know, to adjust the bearing radial clearance, you must change the relative positional relationship between the outer ring, inner ring, rolling elements of these three, intuitive approach is to make the inner ring of the outside or inside of the outer ring can be varied as desired. In terms of ball bearings, a method in which prior machining of the bearing inner ring bore into a certain taper, while cooperating therewith are machined journal corresponding taper. Changing the position of the inner ring after assembly on the shaft of the attachment shaft, so that the outer diameter of the inner ring deforms to cause changes to adjust the bearing clearance. In all fairness, this is a better way, can solve this problem to a certain extent, it followed so far. But there are a few obvious shortcomings, namely limited adjustment amount (even very small), clearance on large powerless. Second, the journal to be processed at a higher precision taper, and the need to set up additional adjustment device, so that the axis of the complex manufacturing process. Third, the inner ring under a lot of prestressing, and for the circumferential tensile stress is extremely detrimental to the bearing strength, and sometimes even when adjusting inner "no war since the break." Thus, the traditional approach is not reasonable, a great need for improvement.

Bearing structure analysis shows that the inner part has already been done in this article, it seems no potential to be tapped. The rolling body is "monolithic" obviously "unprofitable." Naturally, we have to look to the outer ring up. But this part of it is simply another Jane, conventional thinking can not start them, must be another way. After wrestling, multi advice, repeated scrutiny, finally enlightened. Realized that: change the bearing radial clearance, like war, like, not only forced the onslaught from the front (radial), or you can take from the side roundabout clever (axial). Prerequisite is to break the traditional stereotype thinking imprison shackles and force of habit, to dare to innovate. It is a bold vision of the bearing outer ring along the cross-section cut, split into two (reverse thinking, reduced to complicated). About two and a half can make relative axial movement, and then by means of the interaction of specific surface and rolling fairways of the inner body, the relative axial displacement of the outer ring into a radial displacement of the rolling elements and thus receives indirect change within the effect of the radial position between rings, the outer ring, rolling three, to adjust the clearance purposes. Based on this, we can have the following technical solutions: the outer ring of the rolling bearing by-piece to the axial split modular, with double rows of rolling elements, combined with the adjustment shim set. Increase or decrease in the assembly by adjusting the thickness of the gasket to easily adjust the bearing radial clearance to the desired value, and finally coat with a threaded coupling assembly as a whole. Similarly, when working for some time after the bearing wear, but also just appropriate to reduce the thickness of the shims can easily eliminate bad clearance, to restore the original accuracy. To achieve the purpose of repairing.

The advantages of linear motion ball bearings

For linear motion ball bearing structure in the interior of the outer ring has a retainer (Click on linear ball bearing describes the installation configuration), the holder is equipped with more than one ball, and make infinite circular motion. Within two ends of the retainer spring retaining ring in each square ball straight track work force has a gap window. This section is subject to the load so that the ball rolling to make contact with the shaft. Relative movement with a very low coefficient of friction, and therefore linear motion ball bearings for machinery and equipment, automation equipment, energy-saving equipment such as the choice of the most suitable bearings.

Linear motion bearings, is being more and more widely applied to electronics, machinery, equipment, robotics, tools, machinery, food machinery, packaging machinery, medical machinery, printing machinery, textile machinery, machine tools, automobiles and other general or special machinery industry in.

Linear motion ball bearing advantages:

1. Because the flow of contact friction resistance and can start moving friction resistance is small, so you can save energy, easy to get a higher velocity.

2. Load increases, but not sensitive to changes in the friction coefficient, and therefore under heavy load, the friction coefficient is extremely small, and long-term accuracy of the same, we can get long-term mechanical life.

3. Linear motion bearings interchangeability, when the province to install and easy to use, and new mechanical structure, small size, the amount of light of the characteristics.

4. Out to save oil, simplify lubrication and maintenance purposes.

5. The two sides also applies additional bearing seal and dusty places or objects easily penetrated.

How to express the inner diameter of the bearing?

The face of the bearing inner ring on the periphery or the number seen right from the first and second digit is the inner diameter of the bearing, i.e. with the diameter of the shaft. Press the bearing bore size divided into the following methods:
1, codenamed digital since 04 till 99 only, each pair of numbers from right to come ride with five figures represent the two high precision bearings bore size. For example, two digits after the 204 bearing 04, an inner diameter of 04 × 5 = 20 (mm). This section numbers bearing is the most common, it represents the bearing diameter from 20 mm to 495 mm.
2, the inner diameter of 10 to 20 mm in all the bearings (except magneto bearing), which diameter is constant, expressed as follows:
3,1-9 mm (including 9 mm) of small bearings, has its special representation:
Right from the first digit indicates the actual size of the bearing bore,
Right from the second digit indicates the bearing diameter series;
Right from the third digit is O.
For example: There is a small 25 bearings - right from the first digit "5" indicates the bearing inner diameter of 5 mm, the second digit "2" indicates that the bearing is light series single row radial ball bearings, the third digit is " 0 "did not write. Another example: 1006 self aligning roller bearings, represents an inner diameter of 6 mm light series double row spherical ball bearings.
Magneto ball bearings from the right two digits represent the actual size of the inner diameter. As 6015 bearing, represents an inner diameter of 15 mm of magneto ball bearings.
4, bearing diameter is not an integer, is part of a non-standard bearings. In this case, said in an approximation bearing code, and the third from the right in the figures marked with the number 9. Such as the Beijing brand BJ212-road automobile clutch release bearings 688,911, the actual size of the bearing inner diameter = 52.388 mm, diameter = 84.5 mm, width = 20.7 mm. 688911 bearing from the right of the first, two numbers are 11, according to the provisions of its diameter size should be 11 × 5 = 55 mm, but the actual size of the spherical ball bearings

 inner diameter of 52.388 mm. So it takes approximately 55 mm for digital proud bearing diameter code.
5, bearing code figures represented by the following three points:
(1) Bearing in 500 mm diameter size to LIi, the denominator figure represents the actual size of the inner diameter of the molecule digital representation of its series, the type and structure of the method according to the general bearing and regulations. For example 71/900 bearing denominator digital representation of the bearing inner diameter of 900 mm, molecular digital representation for the special lightweight single row tapered roller bearings.
(2) Needle roller bearings do with fractional code, the denominator figure represents the inner diameter of the bearing. For example 943/25 bearing denominator represents the inner diameter of the bearing 25 is of 25 mm.
(3) When the miniature bearings do with fractional code, its denominator figures represent the actual size of the inner diameter of the bearing. Such as 1009 / 2.5) bearing the denominator 2.5, is the diameter of the bearing is 2.5 mm.

Application of ceramic ball bearings in high speed spindle unit

   Ultra-high-speed cutting is high quality, efficient and characterized by advanced manufacturing technology, which can bring high-speed cutting mechanism, high-speed spindle unit, high acceleration and deceleration linear feed motor development, high-performance control systems and other related cell technology. Core support high-speed spindle unit is high-speed spindle bearings. Ceramic bearings for its resistance to high speed, light weight, long life, excellent performance, high-speed spindle unit in machine tools are widely used.
   A high-speed spindle unit and the spindle slewing bearing manufacturer High-speed spindle unit is one of the key technology to achieve high-speed processing, but also a key component of high-speed machine tools. The core of the high-speed spindle unit is high-speed precision bearings, its performance directly affects the performance of work spindle unit. With increasing speed, the bearing temperature, vibration and noise increase, decrease in the life. Therefore, increasing the spindle speed on the premise that developed a superior performance, high-speed spindle bearings. Currently, high-speed spindle unit, supporting mainly uses magnetic double direction thrust ball bearing spindle, liquid hybrid bearing, ceramic ball bearings in three forms. Magnetic Bearings and good high-speed performance, high precision, easy to implement diagnostics and online monitoring. But practice shows that the bearing due to electromagnetic measurement and control system is too complex and has not been widely used. Liquid hybrid bearing combines the advantages of hydrostatic bearings and hydrodynamic bearings, but this bearing must be specifically designed according to the specific machine, a separate production,the low degree of standardization, maintenance is also difficult.
   Currently, the most widely used high-speed spindle bearings or hybrid ceramic ball bearings, namely the use of the rolling elements or hot isostatic pressing Si3N4 ceramic ball bearing rings remains rims. Such a high degree of standardization of the bearings, low price, small changes to the machine for easy maintenance, especially for high-speed operation of occasions. It d · n has exceeded the value 2.7 × 106. To increase bearing life, increase the wear resistance of the raceway, the raceway of the coating treatment or other surface treatment.
   2 Experimental Research
   Test conditions
   The ceramic ball bearings used in the test parameters as shown in Table 1. The ceramic ball material HIPSN (hot isostatic pressing Si3N4), the accuracy level is G3 level, balls and rings when assembling the required value of the fine matching. The bearings are "dense beads beads" structure, and use the thin outer cage. In the tests with the ceramic bearing ball flange bearing

 steel having the same structural parameters.
   Spindle tests used are two models, namely A-type and B-type. Structure schematically shown in Figure 1, the bearing installation in the form of DBB. Table 2 is the main performance parameters of the two spindle.
Table 1 Test parameters with ceramic ball bearing Model Dimensions (mm) ball diameter (mm) contact angle of the original number of balls ceramic ball material cage material ferrule material
   B7007CY35 × 62 × 147.1441615HIPSN resin GCr15
   The main performance parameters in Table 2 spindle
Model limit speed (r / min) spindle diameter (mm) output power (kW) Lubrication
A mist type 30000354.5
B-type 24000354.5 fat
    A high-speed spindle unit structure diagram in Fig.

How many of miniature ball bearings paired parts for testing

Since the accuracy of precision miniature ball miniature ball bearings itself within 1μm, thus requiring its matching parts (shafts, housings, end caps, ring, etc.) have a high dimensional accuracy and shape accuracy, especially to control the accuracy of the mating surfaces of the bearing within the same level, which is crucial, but also the most easily overlooked.
You must also pay attention to precision miniature ball bearings to match parts if not meet the above requirements, often makes precision bearings error occurs several times larger than the original bearings after installation, even 10 times higher than the error, completely ceases precision bearings, because Matching mechanical error is often not simply superimposed on the high precision bearings error, but in a different multiples after amplification additions.
Miniature ball bearing dimensions determined in accordance with the requirements are not the same. Parameters are not the same, bearing in determining the size parameters, we start from multiple angles. Here we talk to everyone from all angles:
In many cases, miniature ball bearings bore size has been specifically defined by the structure of a machine or device. Whether working life, static load safety factor and whether the economy will meet the requirements, bearing the rest before the final selection of the size and structure, will be subject to the size of calculus. The calculation includes the actual load with its load miniature linear bearings

 capacity for comparison.
Miniature ball bearing static load refers to the rear bearing load is stationary (no relative movement between the inner and outer rings) or rotational speed is very low. In this case, the calculation and the rolling body raceways and an excess of factor of safety of plastic deformation. Most affected by dynamic load bearing inner and outer rings relative motion, check the size of calculus fatigue damage raceways and rolling elements of early safety factor.
In fact, miniature ball bearings and model parameters are also functional relationship with the intended use. We must pay attention to these issues.

Thrust ball bearing noise judgment for maintenance checks

   In order to determine whether the removed bearing can be reused to wash clean after the thrust ball bearing checking. Carefully check the raceway, rolling surface, with the surface state of cage wear, increasing the bearing clearance and the presence or absence of injury on the dimensional accuracy of the decline, abnormal. Non-isolated type of small ball bearings, the inner ring with one hand support level, rotate the outer ring to confirm whether smooth.
   Tapered roller bearings and other separation-shaped high precision ball bearings, rolling elements can be, respectively, the outer ring raceway surface inspection.Large bearings because they can not rotate by hand, pay attention to check the rolling body raceway, cage, and other exterior wall surface, the importance of bearing the higher the more necessary to be careful inspection.
   Can be used to determine whether, considering the extent of damage thrust ball bearings, mechanical properties, the importance of operating conditions to be determined during the next overhaul. However, if the following defects can no longer use. Must manage new ones bearing.
   Bearing Manufacturing noise caused by factors although essentially due to a
manufacturing error, but in fact still with lubricant selection, installation conditions of the miniature ball bearings, shaft and housing accuracy states. This noise is divided into the cage and the sound of chatter sound categories, as described below:
   (1) cage sound and control with periodic vibration and noise, prone cage refers to violent vibration sound cage and rolling elements emitted shock and friction in the pocket loose big time. This noise occurs mainly in ball bearings and thrust ball bearings and stamping cage and solid cage will occur when using grease or oil lubrication occurs, but in poor lubrication or lubricant dried up, the radial clearance When the large, outer withstand torque loads, and poor cage structure and accuracy is not high, the more prone to severe cage webs or rivet head will suddenly break.
   The method of controlling noise and vibration cage there; use good lubrication performance lubricants; reduce installation errors bearings; compression bearing radial clearance or suitably axial preload, as well as the choice of having a reasonably good accuracy cage structure flanged ball bearing

, or switch to cage firmly and without worn bearings.
   (2) The sound and control chatter chatter sound is directly related to bearing rolling surface waviness related noise, which is a pure tone noise, for a constant speed, its frequency does not change, and for changing speed It also will change the frequency.  

 

Installation and adjustment of the high-speed bearings

   When fit and clearance high speed bearing both due to the high-speed precision bearings according to the requirements, but also by high-temperature bearing requirements, so considering its fit and clearance, to take into account the following points:
  (1) a dimensional change and hardness change from normal temperature was raised at a high temperature;
  (2) due to the centrifugal force at high speed, and change in shape.
In short, high-speed, high-temperature conditions, and clearance from the mating choice should strive to maintain the accuracy and performance of the bearing, which is difficult.
 In order to ensure the bearing raceway deformation after installation, angular contact ball bearings over the amount of interference can not get too much interference fit, while the heat under the centrifugal force and high temperature under high-speed expansion, or offset the mating surfaces of the normal pressure. Or the mating surface relaxation, and therefore the amount of interference must be calculated carefully consider the above two factors in the premise, at room temperature constant speed under effective amount of interference for high-speed bearings may be invalid.
   If the result of this contradiction is too large (usually only in the ultra-high speed only in this case), only to take measures to double the lubrication ring lubrication method and hydrostatic lubrication and use, and this program has the potential to break through the miniature ball bearings dmn value 3 million mark. Thermal expansion at high temperatures, or the mating surfaces to offset the normal pressure. Or the mating surface relaxation, and therefore the amount of interference must be calculated carefully consider the above two factors in the premise, at room temperature constant speed under effective amount of interference for high-speed bearings may be invalid.
   If the result of this contradiction is too large (usually only in the ultra-high speed only in this case), only to take measures to double the lubrication ring lubrication method and hydrostatic lubrication and use, and this program has the potential to break through the bearing dmn value 3 million mark. When considering the high speed bearing clearance only to consider the above factors, but also to consider the impact of thermal elongation axis clearance required bearing in working condition, that have the best clearance at operating temperature, and this species clearance is included,the exact center of the outer ring ball groove to the next state formation. Since the high-speed bearings reduce strive relative sliding and internal friction, angular contact ball bearings best not to use the inner and outer rings relative axial displacement method to adjust ball bearing clearance.
   In considering the amount of interference with the flanged ball bearing and the clearance, to be noted that the material becomes soft and easily deformable features, and many times from room temperature to high temperature changes caused by the possibility of a certain permanent

deformation at high temperatures.

Miniature linear bearings use

   Linear motion slim ball bearing structure is in the interior of the outer ring has a holder, the holder is equipped with multiple balls, and make infinite circular motion. Within both ends of the retainer spring retaining ring in each side of the ball straight track the work force has a gap in the window. This section is so affected by the load of the ball for rolling contact with the shaft. Relative movement with a very low coefficient of friction, and therefore linear motion ball bearings for the selection of the most suitable bearing mechanical equipment, automation equipment, energy-saving equipment.
   Linear motion bearings, is being more and more widely applied to electronics, machinery, instruments, robots, tools, machinery, food machinery, packaging machinery, medical machinery, printing machinery, textile machinery, machine tools, automobiles and other general or special mechanical industry in.
   Use thin section angular contact bearings advantages:
  1. The contact can start flowing and dynamic friction resistance for minimal friction resistance, thus saving energy, easy to get a higher velocity.
  2. load increases, but not sensitive to changes in the coefficient of friction, and therefore under heavy load, the friction coefficient is extremely small, and the long-term accuracy of the same, we can get long-term mechanical life.

  3. The vertical mill bearing interchangeability, easy to use and save installation time, and new mechanical structure, small, light of the characteristics of volume.
  4. Save oiling procedures to simplify lubrication and maintenance purposes.
  5. The two sides also applies additional bearing seal with dust or foreign matter more easily invade the place.

LYHY flanged ball bearing How to prolong the service life of the bearing flange

Whether buyers or sellers are concerned about the length of life of the bearing. Such as: flange bearings mainly bear radial load, but also to support radial double row ball slewing bearing‍ and axial loads flanged ball bearing. But for the life of the bearing flange are not very understanding, the following three steps will teach you to extend bearing life:

(1) In order to make the radial clearance between the bearing retainer and the bearing ring is provided with greater eccentricity than the internal structure has been improved;

(2) using the FEM analysis, by optimizing the shape and thickness, etc., to improve the strength of the retainer;

(3) In order to prevent a decrease in surface flanged ball bearing‍ damage caused by the lubricating oil in the bearing ring in the design of the guide groove.

high speed bearing Notes miniature bearings heating

1, the yoke is placed on the end face of the host.

2, insert the plug into a power outlet with a control switch on.

3, check the ground wire is good, after power with pencil tests.

4, press the start button, the host power.

5, check the yoke on the ground should be no voltage.

6, press the stop button hosts off, stop heating.

7, depending on the size of miniature bearings or other parts, choose a different yoke put, this yoke on the top surface of the host, should fit flat.

8, when heated miniature high speed ‍bearings, sensors Thrust Roller Bearings‍ should be inserted into the "sensor socket" and the sensor close to the workpiece is heated.

Solution seven miniature bearings overheating when

Miniature bearings fever due to various reasons, it is addressed in different ways, the following are workarounds for miniature bearings overheating when:

1, filling fat law, the so-called law is filled grease to the bearing surface regularly fill the right amount of grease, is one of the most commonly used grease lubrication.

2, oil cup, oil cup is set Capping Oil oily cup cup or pressure in the bearing housing, regularly rotating the cap gun grease or oil injection. This is also a common grease lubrication.

3, the pressure for fat France, France is relying on wind power bearing‍ pressure grease for grease pump for grease. You should choose good mobility grease.

4, centralized method for fat, centralized method for grease through grease pump, while the various deep groove ball bearings and other parts for fat. Similarly, when the grease should be used in mobile offerings and good resistance to oxidation and corrosion resistance of the grease, but also a pressure for grease method.‍

miniature ball bearings Wheel bearing (hub bearing)

Wheel bearing (hub bearing) primary role is to load and for the rotation of the hub to provide accurate guidance, both axial load and radial load, is a very important component. wind power bearing‍ Traditional automotive wheel bearing is 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. Developed on the basis of the hub bearing unit is the standard angular contact ball bearings and tapered roller bearings on, it will be two sets of bearings as a whole, with good assembly performance can be omitted clearance adjustment, light weight, Thrust Roller Bearings‍ compact structure, load capacity large, sealed bearings can advance into the grease, hub seals and maintenance advantages omitted from the outside wheel, has been widely used in cars, and in the truck also has a tendency to gradually expand the application.

LYHY flanged ball bearing Installation and Use

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 composed of ball and roller combined bearing‍ a double row angular contact bearings. The second generation of the outer raceway for bearing a fixed flange ball 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 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. Worn or damaged wheel bearing or hub units will happen to your vehicle anachronistic and higher cost of failure in traveling the road, or even damage to your 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 mobile crane bearing‍ 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 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.

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 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. Angular contact ball bearings‍ 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 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 wind power bearing‍ installation, so that they stay away from magnetic fields, such as the use of electric motors or electric tools. When installing these bearings, the road test by observing the dashboard ABS alarm pin to change the bearing operation.

high speed bearing 3 Maintenance Note

 1.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 * high speed ‍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 double row ball slewing bearing‍ 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 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.

In the repair process, often found that some cars have a greater driving noise, no abnormal tire wear inspection, turn the wheels on the lift no abnormal sound. This phenomenon is often caused by abnormal wheel bearing damage caused by the so-called non-normal means of bearing damage caused by the installation ball and roller combined bearing‍ of. Automotive wheel bearings are generally double row ball bearing, at the time of installation of the bearing installation if you use a hammer percussion, or when the bearing is installed into the bearing inner race of the bearing by pressing installed, will cause one side of the bearing raceways damage. Noise when the vehicle is traveling, and when the wheelie is better since the raceway side, and therefore noise was heard. Correct installation operation is the key to long life bearings.

miniature ball bearings Precision bearings distinction

Precision bearings and plain bearings should be used to distinguish between the following points:

1, the size of the required value is not the same, high level of accuracy of the product of its size deviation (inside diameter, outside diameter, oval, etc.) than the fine

Value of the low level of product requirements to be smaller;

2, rotating accuracy requirement values ​​self aligning ball bearings‍ are not the same, high level of accuracy of the product of its rotational accuracy (internal diameter of the beating, beating the outer diameter of the end face of the raceway beating, etc.) than the value of the low level of precision to be strict product requirements;

3, the surface shape and surface quality requirements values ​​are not the same, high level of accuracy of the product on its surface shape and surface quality (or channel raceway surface roughness, circular deviation, ditch-shaped deviation) than the low accuracy level the value to be strict product requirements;

4, the accuracy of its products particularly high grade material than the material properties of the general levels of precision products more favorable.

Precision bearings in accordance with ISO double row ball slewing bearing‍ grading standards are divided into:. P0, P6, P5, P4, P2 successively higher grades, where P0 is the general accuracy and precision are other grade levels. Of course, different classification criteria, different types of bearings, their method for classifying different, but the meaning is the one to. Performance requirements on the use of precision bearings rotating body with high runout accuracy, high-speed, low friction and friction change.       

LYHY flanged ball bearing Methods to improve cooperation

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 flanged ball ‍bearing bore and the outer dimensions of the actual mating surface precision measurement, the measurement can be related agricultural bearings‍ to inner and outer diameters all items to be measured, and the right to make a comprehensive analysis of the measured data, as a data, precision worthy of the shaft and the bearing seat hole the size of the installation site. In the actual measurements made ​​with the corresponding dimension of the shaft and housing bore and geometry, the measurement should be carried out when the bearing at the same temperature.

In order to ensure a higher actual vertical mill bearing‍ match results, and the surface of the shaft and the bearing seat hole match, the roughness should be as small as possible.

In making these measurements, should be in the outer and inner bore of the bearing and the corresponding surface on the shaft and housing bore at both sides of the assembly near the chamfer, respectively, showing the maximum deviation can be made in two directions marked so in the actual assembly, so that the maximum deviation of the two sides match aligned in the same direction, so that after assembly, the two sides of the deviation can be partially offset.

The purpose of making two directional signs, that can compensate for deviations into account, even if the respective ends of the supporting improved rotational accuracy, and make spherical bearings‍ the two ends of the housing bore and between the journal bearing concentricity error partially eliminate . Implement measures to strengthen the surface of the mating surfaces, such as sand blasting, with a diameter slightly larger than the column precision plug the hole once the plug, etc., are beneficial to improve the fitting accuracy.

high speed bearing Improve Accuracy

After the high speed ‍bearings installed in the host, such as measuring spindle radial runout, measured values ​​can be found in each of its revolutions have some change; continuous measurements, can be found after a certain number of revolutions, the repetition of this change will be approximately appears. precision spindle bearings‍ Indicators to measure the extent of this change is cyclic rotation accuracy, approximately repeated changes in the number of revolutions required precision rotation cycle on behalf of "quasi-periodic" values ​​vary within a large amplitude quasi-periodic, cyclic rotation accuracy is poor .

If properly pre-load on the spindle, the speed gradually increased to nearly the speed of work to implement the "run-in" the role of the bearing can improve the accuracy of the spindle rotation cycle.

6 Install accuracy calibration method

After the angular contact ball bearing into the spindle, install precision calibration sequence is as follows (with shaft diameter of 60 100mm ordinary lathe for example):

(A) measuring the shaft and housing bore size, to determine with precision bearings, with the following requirements:

Take the inner ring and the shaft interference agricultural bearings‍ fit, the amount of interference 0 ~ + 4μm (at light load, when precision is 0); take the outer ring and the bearing bore clearance fit, clearance volume 0 ~ + 6μm (but at the free end of the bearing when using angular contact ball bearings, but also increase the gap); shaft and housing bore surface roundness error in 2μm or less, face parallelism bearing spacer used in the 2μm or less, the end face of the shaft shoulder end foreign beating in 2μm or less; retaining shoulder of the housing bore axis beating 4μm below; cover the front end face of the spindle axis beating 4μm or less.

miniature ball bearings a fixed end bearings mounted on the shaft before

After the bearings were cleaned thoroughly washed with clean kerosene, grease lubrication, the first containing 3% to 5% of the grease into the bearing organic solvents for degreasing and cleaning, and then quantitative grease gun oil filled bearing (accounting bearing space volume of 10% to 15%); Full complement cylindrical roller bearings‍ heating bearings make heating 20 ~ 30 ℃, oil presses the bearing into the shaft; pressure in the tight sets with suitable pressure shaft and bearing against the end face axially the spring balance tape volumes on the bearing outer ring, pre-load starting torque measuring method stipulated check whether a substantial change (even if the bearing is correct, but due to meet or maintain the deformed frame, pre-load there; positioning changes possible).

(3) the bearing shaft assembly into the seat hole

Heated seat hole so that heating 20 ~ 30 ℃, with continuous gentle pressure on the bearing shaft assembly into the housing bore;? Before adjusting cover, tighten the amount of the front cover of 0.02 ~ 0.05μm, to the outer end face of the bearing housing benchmark indicator of the conflict in the journal header surface, the axis of rotation measured beat, require error 10μm or less; will dial gauge positioned on the shaft hole in precision spindle bearings‍ the surface of the back seat of the header conflict, the rotation axis to measure the bearing housing bore concentricity before.

(4) the free end of the bearing may be selectively placed in the position deviation offset mounted to the bearing support position, to offset possible concentricity and roundness deviation of the deviation between each other.‍

LYHY flanged ball bearing 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 spindle  flanged ball ‍bearings are, depending on the machine spindle processes have different requirements. In general, the lathe spindle is used at lower speeds and greater cutting metal cutting load. This type of transmission of the driving torque of the high precision bearings‍ nspindle usually through the pulley or gear. This means that the spindle drive end load is also quite large.

Such applications do not require high speed of the 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 end of the spindle drive uses a double row cylindrical roller bearings. This configuration ensures a long working life and excellent rigidity, to produce high quality parts. Moreover, the bearings can operate 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 bearing Full complement cylindrical roller bearings‍ diameter to the load, the outer diameter of a special foreign ensure it never tolerances can contact bearing).

In the design of these types of spindles (which is usually applied when the heavy load), a bearing located about the axis of where a rule of thumb the distance between the centers of the front and rear support bearings for the 3-3.5 times the diameter.

In that require higher speeds (ie, high-speed machining centers or internal grinding), you need to find a different bearing solutions. Obviously, the need to make Other bearing‍ sacrifices in rigidity and load carrying ability in these cases. High-speed applications usually by direct-motor and / or direct drive spindle coupling (the so-called motor spindle).

high speed bearing Ceramic Bearings

Cheng as an important machine parts, because of its incomparable metal bearing excellent performance, high temperature, super-strength materials such as the new world dominate.

Advantages

First, since the ceramic almost afraid of self aligning ball bearing‍ corrosion, so the ceramic rolling bearings suitable for operation under harsh conditions covered with corrosive media.

Second, since the ceramic rolling the ball lower density than steel, but much lighter weight, so when you rotate the outer ring centrifugal effect can be reduced by 40%, thus greatly extended service life.

Third, the expansion and contraction of the ceramic affected smaller than steel, and therefore the gap of the bearing is constant, the bearing allows the temperature changes Taper roller bearings‍ more severe environment.

Fourth, as the ceramic high modulus of elasticity than steel, when the force is not easy deformation, and therefore help to improve the operating speed and achieve high accuracy.‍

miniature ball bearings Applications

Medical equipment, cryogenic engineering, optics, high-speed machine tools, high-speed motor, printing machinery, food processing machinery.

In the field of aerospace, marine, nuclear industry, taper roller bearing‍ petroleum, chemical industry, textile industry, machinery, metallurgy, electric power, food, locomotives, subway, high-speed machine tools and research needs of national defense and military technology in high-temperature, high-speed, cryogenic, flammable, explosive, strong corrosion, vacuum, electrical insulation, non-magnetic, dry friction and other special conditions of work, replace the indispensable role of ceramic bearings are being increasingly recognized people.

With the continuous advancement of processing technology, increasing the level of technology, the cost of ceramic bearings declining, has been in some high precision applications in Angular contact ball bearings‍ the field of small-scale tip, gradually extended from the past only to the national economy in various industrial fields, the market price gradually approaching practical, to achieve an acceptable level users, the wave of large-scale applications of ceramic bearings have been coming!

LYHY flanged ball bearing Uses classification

(1), high-speed bearings: a cold, mechanical elasticity is small, anti-stress, poor thermal performance, light weight, low friction coefficient, etc., can be applied at 12,000 rev / min -75 000 rev / min high speed spindle and the other precision equipment;

(2), the bearing temperature: temperature slewing ring bearing‍ of the material itself has 1200 ℃, and good self-lubricating, temperature is not generated due to the expansion caused by temperature differences between the 100 ℃ -800 ℃. Can be used in furnaces, made ​​of plastic, steel and other high-temperature devices;

(3), corrosion-resistant bearings: the material itself has a corrosion-resistant properties, can be applied in the field of acids, alkalis, inorganic and organic salts, water, etc., such as: plating equipment, electronic equipment, chemical machinery, shipbuilding, medical equipment, etc. .

(4), magnetic bearings: do Single row crossed roller slewing bearing‍ not smoke because of non-magnetic dust, can reduce bearing advance peeling, noise and large. Available in demagnetization device. Precision instruments and other fields.

(5), electrical insulation flanged ball ‍bearings: due to the high resistance force, can avoid arcing damage bearings, available in a variety of requirements for insulation of electrical equipment.

(6), vacuum Bearings: Ceramic materials for unique oil-free self-lubricating properties, in ultra-high vacuum environment, can not be achieved to overcome the plain bearing lubrication problems. Note: The above five categories bearings, bearing the same set can be applied to high-temperature, high-speed, pH, Angular contact ball bearings‍ magnetic field, in the non-insulated, but the material properties vary (see performance table of rare earth ceramic material) so please customers choose products, applied according to their own situation, to select the material most suitable ceramic bearings.

high speed bearing Silicon nitride ceramic bearings

Silicon nitride ceramic bearing rings and rolling silicon nitride (Si3N4) ceramic materials, the general use of RPA66-25, PEEK, PI, and phenolic cloth bakelite tubes. SiN4 system ZrO2 full ceramic bearings compared to material suitable for higher speed and load capacity, as well as suitable for higher ambient self aligning ball bearing‍ temperatures. While providing precision ceramic bearings for high-speed precision and high rigidity of the spindle, the highest manufacturing precision of P4 to UP level.

Full ceramic bearings, full complement ball

Full complement ball full ceramic bearing side with Tim ball gap, due to the use of cage-free design, you can load more than the ceramic ball bearing standard structure, thereby increasing its load capacity, also can avoid the restrictions shelf materials can be achieved by ceramic cage type full ceramic bearing corrosion and temperature effects. The series bearing suitable for high speed, the installation should pay attention to the gap surface mounted on one end does not bear the axial load.

Hybrid ceramic ball bearings

Especially silicon nitride ceramic balls ball with tower crane bearing‍ a low density, high hardness, low friction coefficient, wear-resistant, self-lubricating and rigidity characteristics, especially suitable for high-speed, high-precision and long life hybrid ceramic ball bearings rolling elements (inner and outer rings metal). General inner and outer rings bearing steel (GCr15) or stainless steel (AISI440C), ceramic balls can be used ZrO2, Si3N4, or SiC material.

miniature ball bearings Deep groove ball bearings

(Technical grade: P4, P5, P6, P0) deep groove ball bearings, the most representative of rolling bearings, widely used, can bear radial load and axial load. Suitable for high-speed, thin section angular contact bearings‍ low noise, low vibration and high temperature occasion or steel bearings can not be applied, the cold, corrosion, magnetic, non-insulated and other fields.

Aligning ball bearings

Aligning ball bearing outer ring raceway spherical, self-aligning, can add error misalignment and shaft deflection caused. Shaft and housing for generating different parts of the heart or shaft deflection and aligning parts of high temperatures, low cold, corrosive, non-magnetic insulation requirements. Note: The tilt is not more than 3 degrees.

Single row angular contact ball bearings

(Technical grade: P4, P5, P6, P0) angular contact bearings for high-speed and high-precision rotation, at high temperature, magnetic field, water and so does not affect its accuracy, and cross roller bearings‍ can withstand the synthesis load. Standard contact angle of 15 °, 30 ° and 40 °, the contact angle greater the greater the axial load capacity, the contact angle is smaller bearings can bear radial load and axial load. Generally installed in pairs taken. Please take note at the time of purchase.

Thrust ball bearings

Thrust ball bearings, with the ball rolling by washer-shaped raceway rings and the ball cage assembly components. Can withstand axial load, but can not bear radial load.‍

LYHY flanged ball bearing( Radial ball bearing

Radial ball bearing is a universal design that can withstand the load of different sizes in the high-speed movement. This type of rolling bearings by sets of precision ball and cage as well as the composition of the inner and outer rings. Which standard radial ball bearings there is a deep groove structure that can withstand the Double Row Ball Slewing Bearing‍ radial load and smaller axial load from any direction. Has a maximum load capacity of radial ball bearings mainly take radial load. This type of bearing a variety of sizes to choose from. Different configurations can be sealed to protect the internal components of rolling bearings and grease can be retained. Radial ball bearings are widely used in general industry, automotive industry, agriculture, chemical and household appliances industries.

‍

LYHY flanged ball bearing bearing

Fatigue life test is to maximize the full lubrication abrasion factor inhibiting the bearing load and speed, the enhancement to an enhanced fatigue life test method for outstanding bearing fatigue factors.

The calculation and test of fatigue life of bearing fatigue single direction thrust ball bearing‍ life is complementary, the two results are corresponding enough. But in reality, such as for each specific occasions, all selected Boying bearing a sufficient number of life test, to verify the selected bearing is suitable or not, this is very big in the economy, time and amount of labor, so the life test of automotive bearings only is used in a very necessary or important case, in most cases, the standard life calculation method to estimate the service life of the bearings, with a sufficient degree of dependency. To predict the fatigue life of bearing, determining the remaining life, need to understand the bearing fatigue all the failure phenomenon, so it will take a long time. However, because the rolling fatigue fatigue at the contact point under compressive stress occurs, to achieve the damage will occur great change of materials. Therefore, in addition to extend prior to material changes in surface cracked, raceway suffer chemical effect, crack cases, detection of material changes may judge the vehicle bearing fatigue. The main reason is the defect of bearing fault off the overload two elements. When the load across the material Angular contact ball bearings‍ strength and the formation of broken parts called overload fracture. The reason is mainly from the sudden overload machine fault or install. Are defects cause fracture can be bearing parts of the micro cracks, shrinkage, bubbles, large foreign things, organizations and local overheating burn defect is shock overload or violent vibration, known as the defect fracture. It should be noted that, automobile bearing is process, the materials into the factory inspection, casting and heat treatment quality control, process control and instrument for the precise analysis of the defects can be through with no, then must still strengthen control.

But in general, the failure of most overload bearing fracture usually.‍

high speed bearing Bearing clearance selection technique

Clearance is an important factor in rolling bearing can work normally, divided into the axial clearance and the radial clearance. Select the appropriate clearance, can make the load in the high speed bearing ‍ rolling body between the reasonable Double Row Ball Slewing Bearing‍ distribution; can limit axis (or shell) of the axial and radial displacement, ensure the rotating precision of shaft; the bearing work at a prescribed temperature; reduce the noise and vibration, to improve the bearing life. Therefore. In the selection of bearings, bearing clearance, must choose the appropriate.

Selection of bearing clearance, should consider the following aspects:

1, the bearing working conditions, such as load, temperature, speed etc.;

2, on the use of performance requirements (bearing rotation accuracy, friction torque, vibration, noise);

3, the bearing self aligning ball bearing‍ and the shaft and housing bore is in interference fit with the lead to reduction of bearing clearance;

4, when the inner and outer rings of bearing, the temperature difference caused reduction of bearing clearance;

5, because the expansion coefficient of shaft and housing materials of different, resulting in the decrease or increase of bearing clearance.

6, according to experience, the most suitable for ball bearing clearance work to nearly zero; roller bearing should keep a small amount of clearance. At the request of supporting rigid good parts, bearing preload has certain value. Here is particularly pointed out that, the so-called clearance refers to the bearing clearance, in the actual operating condition. There is also a play called the original wheel bearing‍ clearance, refers to the bearing without clearance. The original clearance than installation clearance. We choose to play, mainly is to choose appropriate clearance.