Deep groove ball bearing is a common type of NTN bearing
NTN bearings are representative rolling bearings with a wide range of applications. Suitable for high-speed and even very high-speed operation, it is very durable without regular maintenance. Moreover, it has the advantages of small friction coefficient, high limit speed, simple structure, low manufacturing cost and high manufacturing precision.
Size ranges and forms vary widely. Used in precision instruments, low noise motors, automobiles, motorcycles and general machinery industries. It is a bearing widely used in the machinery industry. It mainly bears radial load and a certain amount of axial load.
When a larger radial clearance is selected, the axial bearing capacity increases, and the contact angle is zero when bearing pure radial force. When there is an axial force, the contact angle is greater than zero. Generally, stamping corrugated cages, turning solid cages, and sometimes nylon cages are used.
After the bearing is installed on the shaft, the axial displacement in both directions of the shaft or housing can be limited within the axial clearance of the bearing, so axial positioning can be performed in two directions. In addition, this NTN bearing also has a certain self-aligning ability.
When it is inclined 2′～10′ relative to the shell hole, it can still work normally, but it will have a certain impact on the service life of NTN bearings. NTN bearing cages are mostly stamped steel plate corrugated cages, and large bearings mostly use car-made metal solid cages. Commonly used in gearboxes, instruments, motors, household appliances, internal combustion engines, transportation vehicles, agricultural machinery, construction machinery, engineering machinery, etc.
The mechanization of NTN Bearing
The first is to identify and NTN bearing in check the rolling sound
With the progress and development of society, mechanization has been widely used in production and life. As an integral part of machinery, NTN bearings will be used more and more widely, because as long as there is a rotating place, bearings will be used.
Bearings are mainly used to support and reduce friction in machinery, so the precision and noise of bearings are directly related to the service life of machinery.
NTN bearing models are generally selected by user technicians according to the service conditions and loads of the supporting products. If the bearing does not meet the requirements for use, it is recommended to re-select as soon as possible, but unless it is a special product, there is generally no problem in the selection.
Bearings are high-precision products. If the assembly is improper, it is easy to damage the bearing channel, resulting in damage to the bearing. The bearing must be equipped with a special mold during assembly, and cannot be knocked at will. When the final shaft is pressed, only the small ring can be stressed, and when the large ring is pressed, only the large ring can be stressed.
Pneumatic or hydraulic is required for assembly. When stamping and assembling, the upper and lower molds should be outside the horizontal state. If there is an inclination, the bearing channel will be damaged due to force, and the bearing will produce conducted sound.
The service life of NTN bearings is closely related to manufacturing, assembly and use. Every link must be done well to keep the bearing in running condition, thus prolonging the service life of the bearing.
We can use sound detector to check the rolling sound and sound quality of Timken bearing in operation. Because Timken bearing will emit abnormal sound and irregular sound even if there is slight peeling and other damage, it can be distinguished by sound detector to prevent it in advance.Advantages of NTN bearing in application
Secondly, the vibration of Timken bearing in operation is identified and checked
Timken bearing vibration is very sensitive to the damage of Timken bearing. For example, peeling, indentation, corrosion, crack, wear, etc. will be reflected in the vibration measurement of Timken bearing. Therefore, the vibration can be measured by using a special Japanese Timken bearing vibration meter (frequency analyzer, etc.), and the specific situation of abnormality can not be inferred through frequency division. Advantages of NTN bearing in application
The measured values are different due to the service conditions of Timken bearing or the installation position of sensor, so it is necessary to analyze and compare the measured values of each machine in advance to determine the judgment standard.Advantages of NTN bearing in application
After that, check according to the temperature of Timken bearing
The temperature of Timken bearing can generally be inferred from the temperature outside the Timken bearing chamber in Japan. It is more appropriate if the outer ring temperature of Timken bearing can be directly measured by oil hole. Usually, the temperature of Timken bearing rises slowly with the start of operation and reaches a stable state after 1-2 hours. The normal temperature of Timken bearing varies with the heat capacity, heat dissipation, speed and load of the machine.Advantages of NTN bearing in application
If the lubrication and installation parts are appropriate, the Timken bearing temperature will rise sharply and abnormal high temperature will occur. At this time, the operation must be stopped and necessary preventive measures must be taken. Advantages of NTN bearing in application
According to a large number of test data, since the temperature is affected by lubrication, speed, load and environment, the value in the table only represents the approximate temperature range. Using the thermal sensor, the working temperature of Timken bearing can be monitored at any time, and the automatic alarm or stop when the temperature exceeds the specified value can be realized to prevent the occurrence of combustion shaft accident
In order to improve the actual fitting accuracy of NTN bearing during installation, it is necessary to accurately measure the fitting surface dimensions of the inner hole and outer circle of NTN bearing by using the measurement methods and tools that do not deform the NTN bearing. NTN bearing in
All the measurement items related to the inner diameter and outer diameter can be measured, and the measured data can be comprehensively analyzed. Based on this, the dimensions of the installation parts of Japanese NTN bearing that accurately match the shaft and seat hole can be measured. Advantages of NTN bearing in application
When actually measuring the corresponding size and geometry of the matched shaft and seat hole, it shall be carried out under the same temperature conditions as when measuring NTN bearing in
In order to ensure a high actual matching effect, the roughness of the surface of the shaft and seat hole matched with the NTN bearing NTN bearing in shall be as small as possible.
During the above measurement, two groups of marks indicating the direction of large deviation shall be made on the outer circle and inner hole of NTN bearing and the corresponding surface of shaft and seat hole on both sides close to the assembly chamfer, so as to align the large deviation of matching two sides with the same direction during actual assembly, so that the deviation of both sides can be partially offset after assembly.NTN bearing
The purpose of making two groups of orientation marks is to comprehensively consider the compensation of deviation, not only improve the rotation accuracy of the supports at both ends, but also partially eliminate the coaxiality error of the seat hole between the two supports and the journal at both ends. NTN bearing
The implementation of surface strengthening measures on the mating surface, such as sand blasting, using a precision plug with a slightly larger diameter to plug the primary inner hole, etc., NTN bearing in are conducive to improving the mating accuracy.Advantages of NTN bearing in application
Coaxiality of main fag bearing bore
Focusing on the development of sea and land oil and natural gas, the demand for oil refining, ethylene and three major synthetic materials (synthetic resin, synthetic rubber and synthetic fiber) of NTN bearing in will increase at a growth rate of 6% to 9%. Advantages of NTN bearing in application
This requires a large number of oil and gas pipeline gathering and transportation equipment and large-scale and efficient petrochemical equipment, focusing on the development of large-scale desert and marine oil exploration and drilling and production equipment, and large-scale complete sets of equipment with an annual output of more than 600000 tons of ethylene, 450000 tons of synthetic ammonia, 800000 tons of urea and chemical fiber. Advantages of NTN bearing in application
Therefore, the annual market demand of ina bearings, mechanical seals and packing static seals for petrochemical equipment supporting and maintenance will increase greatly.Advantages of NTN bearing in application
INA Bearing has developed a series of high temperature resistant sealed self-aligning roller ina bearings suitable for harsh environments. This Japanese ina bearing is characterized by rubber seals on both sides to ensure that the Japanese NTN bearing in Raceway operates in a dust-free environment and prevent grease leakage.Advantages of NTN bearing in application
It has the advantages of dust-proof, waterproof, high temperature and high pressure resistance, heavy load and other advantages. It also has open type and high temperature resistant ina bearings suitable for specific applications, It can operate continuously under the working condition of – 40 to + 350 degrees, which is the attractive feature of NTN bearing in and can not be replaced in many demanding applications. Fag bearing inner diameter
Before measurement, the fag bearing shall be installed according to the regulations and the bolts of fag bearing cover shall be tightened according to the specified torque. The inner diameter gauge shall be used to measure after the reference dimension is measured with the outer diameter micrometer. Advantages of NTN bearing in application
The thinning area shall be avoided during measurement. The difference between the fag bearing inner diameter and the corresponding journal outer diameter is the fit clearance.Advantages of NTN bearing in application
The coaxiality error of the inner hole of the main fag bearing is mainly caused by the coaxiality error of the bearing hole, and the coaxiality error of the bearing hole is caused by the deformation of the cylinder block. When the radial circular runout of the main journal is within the specified tolerance, check the bite mark of the main journal and fag bearing. Advantages of NTN bearing in application
If the bite mark position of each main fag bearing is obviously inconsistent, it indicates that the coaxiality error is large, which can be solved by scraping, boring fag bearing or replacing cylinder block, otherwise it is difficult to ensure the normal operation of the engine.Advantages of NTN bearing in application
JapanNTN bearing in thickness
The fixed probe of the outside micrometer is changed from a plane to a spherical surface, which can be used to measure the thickness of fag bearing. The thickness of fag bearing shall be controlled within 0.005 ~ 0.010 mm generally, otherwise the inner diameter of fag bearing will exceed the tolerance. Japan fag bearing has slight thinning near the opening, which should be paid attention to during measurement.Advantages of NTN bearing in application
The fit tightness is guaranteed by the free spring opening of fag bearing and the height of surplus surface.Advantages of NTN bearing in application
The method of measuring the height of the remaining surface
Assemble the fag bearing as required, tighten the fag bearing cover bolts to the specified torque, loosen one of the bolts, and measure the clearance at the fag bearing cover interface with a feeler gauge, which shall be within the range of 0.05 ~ 0.15mm.Advantages of NTN bearing in application
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