Size, direction and nature of load: ball bearing is suitable for light load, and roller bearing is suitable for heavy load and impact load. When the rolling shaft bears pure axial load, thrust bearing is generally selected; When the rolling shaft bears pure radial load, deep groove ball bearing or short cylindrical roller bearing is generally selected;
When the rolling shaft bears pure radial load and small axial load, deep groove ball bearing, angular contact ball bearing, tapered roller bearing, self-aligning ball or self-aligning roller bearing can be selected;
When the axial load is large, the angular contact ball bearing and tapered roller bearing with large contact angle can be selected, or the combination of radial bearing and thrust bearing can be selected, which is especially suitable for extremely high axial load or special requirements for large axial rigidity.
Allowable speed: it varies greatly due to different types of imported bearings. In general, bearings with low friction and low heat generation are suitable for high speed. The rolling bearing shall be designed to work under the condition of lower than its limit speed.
Rigidity: when the bearing bears load, the contact between the bearing ring and the rolling element will produce elastic deformation. The amount of deformation is proportional to the load, and its ratio determines the rigidity of the bearing. Generally, the rigidity of the bearing can be improved through the preloading of the bearing; In addition, in the bearing support design, considering the combination and arrangement of bearings can also improve the support stiffness of bearings.How to reduce the noise of INA Bearing
Centering performance and installation error: after the bearing is installed in the working position, it is often installed and positioned poorly due to manufacturing error. At this time, the bearing is often subjected to excessive load due to shaft deflection and thermal expansion, resulting in early damage. Self aligning bearing can overcome the defects caused by installation errors by itself, so it is a bearing suitable for this kind of purpose.How to reduce the noise of INA Bearing
tapered roller bearing, needle roller bearing and tapered roller bearing belong to the type of bearing with separable inner and outer rings (i.e. the so-called separated bearing), which is convenient for installation and disassembly.How to reduce the noise of INA Bearing
Ina bearing is an international well-known brand bearing with a wide range of uses. Users will inevitably encounter noise from the bearing in the process of use. So how to reduce the noise of INA Bearing? Let’s give you a brief introduction:How to reduce the noise of INA Bearing
Adding some chemical additives to the lubricant of INA Bearing by using chemical additives can reduce the bearing noise. For example, a low-noise grease containing noise reduction additives produced by a factory in Tianjin can reduce the bearing noise by 3.9 ~ 9.2db from the original basis, which is suitable for use in micro or small bearings.How to reduce the noise of INA Bearing
Good results can be obtained by using vibration absorption or vibration isolation devices to reduce the noise of ina bearings or isolate the noise of bearings, but this often costs a lot in economy. Sometimes, the mechanism becomes larger, the heat dissipation conditions become worse, or it is easy to rust. It should be considered comprehensively in use.How to reduce the noise of INA Bearing
This method can be used only after other measures are taken and the low noise index can not be reached. A simple example is the centripetal ball bearing that bears the thrust instead of the thrust bearing at high speed. It can be sleeved with a plastic jacket filled with antirust lubricating oil on its outer ring.How to reduce the noise of INA Bearing
The thrust bearing with housing or general thrust bearing can be inlaid with the same plastic sleeve in its inner hole or outer circle if allowed, but the control can not rub or interfere with adjacent parts during rotation. This method has a certain silencing effect. How to reduce the noise of INA Bearing
Another example is to add an intermediate sleeve between the bearing and the seat hole, which can attenuate the vibration force transmitted by the rotating system to the bearing seat, but this requires proper allocation, otherwise the opposite effect may occur.How to reduce the noise of INA Bearing
Another example is the use of sound absorption and sound insulation cover to completely close the bearing system with noise or as close as possible. The inner part of the noise reduction cover is glass fiber or polyurethane foam plastic, and the inner surface is 0.6- LMM thick steel plate, which is uniformly distributed on the surface φ 1.2-1.5mm small through hole, the total area of which accounts for about 25% ~ 30% of the whole inner surface, and the outer surface is 2mm thick steel plate.How to reduce the noise of INA Bearing
Here, glass fiber or foam plastic is used to eliminate higher frequency noise, the inner surface with small holes is used to eliminate lower frequency noise, and the thick steel plate on the outer surface is used to isolate the external transmission of noise.How to reduce the noise of INA Bearing
The method of changing the speed of the corresponding part of the main engine ina bearing noise is not very sensitive to the load, but it is very sensitive to the speed. If conditions permit, reduce the speed and increase the torque to achieve the same working purpose, but reduce the noise.How to reduce the noise of INA Bearing
[example] in order to reduce the noise of the oil pump system, the original oil pump with a flow of 10L / min at a motor speed of 1430r / min is changed to a motor with a speed of 710r / min and equipped with a larger oil pump to obtain the same flow. After that, the noise of the oil pump itself, the oil pump bearing and the oil pump motor bearing is significantly reduced, but the space occupied by the whole mechanism is expanded and the cost is increased.How to reduce the noise of INA Bearing
The purpose of the cage is:How to reduce the noise of INA Bearing
SKF imported bearings (especially rolling bearings) are of two structures with cage and without cage. Among them, large SKF imported bearings are generally required to bear a large load, often without cage, but filled with rolling elements between the inner and outer raceways. Most small and medium-sized rolling bearings have cages.How to reduce the noise of INA Bearing
In the processing process of SKF imported bearings, how do the outer ring, inner ring, rolling element and cage of the bearing fit together. To put it simply, first place the inner and outer rings of SKF imported bearing, place the inner ring next to the side, then place the rolling element (put it aside), then adjust the position of the rolling element, and then place the cage. Cage is also involved in the processing of bearing, so what is the main function of bearing cage?How to reduce the noise of INA Bearing
And drive the rolling body to roll on the correct raceway;How to reduce the noise of INA Bearing
The cage separates the rolling elements at an equal distance and evenly distributes them on the circumference of the raceway to prevent mutual collision and friction between the rolling elements during operation;How to reduce the noise of INA Bearing
In the release bearing, the rolling element and a ferrule are combined to prevent the rolling element from falling off.How to reduce the noise of INA Bearing
SKF imported bearing is called the window, which is used to isolate and the rolling element. The pocket clearance makes the cage have a certain amount of activity in the radial and axial directions. The total amount of activity in the radial direction is called the clearance of the cage. In roller cage, there are many structural types and complex shapes. There are many pockets with equal distance on the cage. How to reduce the noise of INA Bearing
The pocket shape includes spherical, circular, elliptical, rectangular and tooth shape. Its size is larger than the size of the rolling body. The difference between the two is the pocket gap. Sometimes the connecting part between the windows of the rolling cage is called lintel, which plays the role of connecting and increasing the strength of the cage.How to reduce the noise of INA Bearing
Key points for good use of bearings:How to reduce the noise of INA Bearing
SKF imported bearing is a kind of precision mechanical support element. Bearing users deeply hope that the bearing installed on the main engine will not be damaged and maintain its dynamic performance within the predetermined service life, but the objective facts are sometimes not satisfactory. Sudden SKF imported bearing failure accidents will cause great losses to users. How to reduce the noise of INA Bearing
The failure analysis and research of a large number of rolling bearings show that the short life or premature loss of accuracy of bearings are caused by material defects or improper manufacturing, but to a large extent, it is due to the failure to install and maintain in strict accordance with the use requirements of SKF imported bearings, or the improper selection of SKF imported bearings or the actual load exceeding the rated load of SKF imported bearings, resulting in the abnormal damage of SKF imported bearings, for example, The fatigue spalling of SKF imported bearing parts is largely caused by impurities in the lubricating oil. How to reduce the noise of INA Bearing
It can be seen that in order to achieve a longer service life and precision retention period of rolling bearings, in addition to requiring the bearing manufacturer to improve the product quality, users of SKF imported bearings must also use SKF imported bearings with scientific methods and procedures, otherwise, the best bearings will die prematurely under the harsh and arbitrary use conditions.How to reduce the noise of INA Bearing
The early failure forms of rolling bearing mainly include fracture, plastic deformation, wear, corrosion and fatigue. Under normal conditions, it is mainly contact fatigue.How to reduce the noise of INA Bearing
Preparation before installation
Selection and requirements for installation site
The installation site shall be at a distance from lathes, grinders and other mechanical equipment. The site shall be cleaned and kept dry and clean frequently to prevent iron filings, sand, dust and moisture from entering the SKF imported bearing.How to reduce the noise of INA Bearing
Check the model of SKF imported bearing and prepare installation tools
Check whether the bearing model and size meet the installation requirements, select the appropriate assembly method and prepare the tools and measuring tools for installation according to the structural characteristics of SKF imported bearings and the matching parts. The commonly used installation tools include hand hammer, copper rod, sleeve, special backing plate, screw mosquito fixture, press, etc., and the measuring tools include vernier caliper, micrometer, dial indicator, etc.How to reduce the noise of INA Bearing
If there are bumps, rust layers, wear debris, sand particles, dust and soil on the assembly surface of SKF imported bearings and the surfaces of matched parts, one is that the bearing installation is difficult, resulting in incorrect assembly position; Second, these attachments form abrasives and are easy to wear the working surface of the bearing, affecting the assembly quality. How to reduce the noise of INA Bearing
Therefore, before installation, carefully inspect the surface of journal, bearing housing hole, shoulder end face and the mating surface of connecting parts such as bushing, washer and end cover. If there is a rust layer, it can be filed off with a fine file and polished with a fine abrasive cloth. At the same time, the attachments on the assembly surface of SKF imported bearing and its connecting parts shall be removed.How to reduce the noise of INA Bearing
Inspect the bearing assembly surface
The lubricating grease adsorbs the acid components volatilized from the paint, causing the deterioration of the lubricating grease, and this acid component promotes the hydrolysis of the grease. As a result, the concentration of the acid component increases, causing the corrosion of Timken bearing.How to reduce the noise of INA Bearing
The working principle of grease is to separate the steel ball from the inner and outer raceways by using the grease layer, adhere to the surface of the steel ball and raceway by using the viscosity characteristics of grease, separate the metal interface between the steel ball and the inner and outer raceways, reduce the wear of the metal surface, protect the metal from air and moisture corrosion, reduce vibration and noise, and enable Timken bearing to rotate smoothly.How to reduce the noise of INA Bearing
However, after the grease deteriorates, the viscosity will change, the oil film will break through, and the separation function and adhesion characteristics of the grease will disappear, resulting in serious consequences
First, the acid components produced by insulating paint directly oxidize the metal surface, causing Timken bearing corrosion.How to reduce the noise of INA Bearing
Second, it causes the steel ball to directly touch the inner and outer raceways and wear during rotation, resulting in increased noise.How to reduce the noise of INA Bearing
In order to better use SKF imported bearings, the following points should be noted:How to reduce the noise of INA Bearing
Contact fatigue failure is the main form of normal failure of Koyo bearing. When the rolling bearing is running, the rolling element rolls between the raceways of the inner and outer rings of the bearing, and its contact part bears periodic alternating load, which can reach hundreds of thousands of times per minute. Under the repeated action of periodic alternating stress, fatigue spalling occurs on the contact surface.How to reduce the noise of INA Bearing
After the rolling bearing begins to peel off, it will cause the vibration and noise of Koyo bearing to increase, and the working temperature will rise sharply, resulting in the final damage of Koyo bearing. This damage form is called contact fatigue damage. Therefore, Koyo bearings require that the steel used for rolling bearings should have high contact fatigue strength.How to reduce the noise of INA Bearing
When the rolling bearing works normally, it is accompanied by sliding friction in addition to rolling friction. The main parts of sliding friction are: the contact surface between the rolling element and the raceway, the contact surface between the rolling element and the pocket hole of the cage, between the cage and the retaining edge of the ferrule, and between the end face of the roller and the retaining edge of the ferrule. How to reduce the noise of INA Bearing
The existence of sliding friction in Koyo bearing rolling bearing inevitably causes the wear of Koyo bearing parts. If the wear resistance of bearing steel is poor, the rolling bearing will lose its accuracy prematurely due to wear or increase the vibration and reduce the service life of Koyo bearing due to the decline of rotation accuracy. Therefore, Koyo bearing steel is required to have high wear resistance.How to reduce the noise of INA Bearing
The basic requirements for materials of rolling bearings largely depend on the working performance of Koyo bearings. The selection of suitable materials for manufacturing rolling bearings will have a great impact on its service performance and service life. Generally, the main failure form of rolling bearing is fatigue spalling under alternating stress, bearing and loss of bearing accuracy due to friction and wear. How to reduce the noise of INA Bearing
In addition, there are cracks, indentation, corrosion and other reasons that cause abnormal damage to Koyo bearings. Therefore, rolling bearings should have high plastic deformation resistance, less friction and wear, good rotation accuracy, good dimensional accuracy and stability, and long contact fatigue life.
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