Low noise FAG bearing selection

(1) Dynamic FAG bearing with low noise requirements

In the FAG bearing produced in China, the department has a low-noise variety of FAG bearings for FAG bearings and FAG bearings. Among them, the ball FAG bearing has several varieties with Zl, Z2 and Z3 suffixes from the inner diameter φ2.5mm to φ60mm, which respectively correspond to three different low noise requirements, and the roller FAG bearing has eight types from N309 to N322. Models are also available in low noise scales.

These FAG bearings can be used in other machines with low noise requirements and are inexpensive, as is the type and size of the two types of low noise FAG bearings.

(2) FAG bearings with relatively small noise

When the above two types of low noise FAG bearings cannot be used, FAG bearings with relatively low noise can be used. The detailed comparison is based on the following:

1) The noise of the ball FAG bearing is lower than that of the roller bearing, and the (friction) noise of the FAG bearing with less relative sliding is lower than that of the FAG bearing with relatively relatively sliding;

2) The noise of the FAG bearing using the solid cage is relatively lower than that of the FAG bearing using the stamped cage; the noise of the FAG bearing using the plastic cage is lower than that of the FAG bearing using the above two cages; Thick, less noisy,

3) FAG bearings with high precision, especially FAG bearings with higher precision of moving body, have lower noise than low-precision FAG bearings.

4) The noise of small FAG bearings is relatively small compared to that of large FAG bearings.

For example, the noise of a radial ball bearing is smaller than that of a short cylindrical roller bearing, and the noise of a short cylindrical roller bearing is smaller than that of a tapered roller bearing.

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Notes on regular maintenance of NTN bearings

When inspecting NTN bearing equipment for regular inspection, operation, and removal of NTN bearings during replacement of external parts, it is necessary to determine in turn whether secondary NTN bearing parts can be reused and recorded better or worse. It is also necessary to carefully investigate and record the NTN bearings and appearance that have been removed. In order to clarify and investigate the remaining amount of lubricant, after sampling, it is necessary to clean the NTN bearing well.

Next, check the raceway surface of the NTN bearing, the condition of the rolling surface and the mating surface, and the wear state of the cage, etc., for damage and abnormality, especially to observe the running track of the raceway surface. To determine whether the NTN bearing can be used again, it is necessary to consider the degree of damage to the NTN bearing, machine performance, importance, operating conditions, inspection cycle, etc.

If the NTN bearing is found to be damaged or abnormal, please find out the cause according to the NTN bearing damage and formulate countermeasures. In addition, the inspection results, if there are the following defects, NTN bearings can no longer be used, need to replace the new NTN bearings.

a. Cracks and fragments appear in any of the inner and outer rings, rolling elements, and cages.

b. Any one of the inner and outer rings and the rolling elements are peeled off.

c. The raceway surface, the ribs, and the rolling elements have significant jamming.

d. The cage is worn out or the rivets are loose.

e. The raceway surface, rolling elements are rusted and flawed.

f. There are significant indentations and marks on the rolling surface and the rolling elements.

g. There is creep on the inner diameter surface of the inner ring or the outer diameter of the outer ring.

h. Superheated and discolored.

i. Grease seals NTN bearing seals and dust caps are damaged.

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SKF bearing grease selection considerations

In order to better play the best condition of the bearing, the choice of SKF bearing grease is directly related to the stable operation of the equipment. The choice of bearing grease must be considered from the following aspects:
1. Anti-rust performance
The rust inhibitor is preferably insoluble in water. Grease should have good adhesion, and the grease used in the bearing must have anti-rust effect. And can form a layer of oil film on the steel surface.
2. Mechanical stability
Causes a leak. In normal operation, the grease will become soft during machining. Grease will be trapped inside the bearing by the bearing housing. If the mechanical stability of the grease is insufficient, during the operation, the structure of the soap of the grease will mechanically disintegrate, causing the grease to be destroyed, thereby losing the lubricating effect.
3. Oil seal
Oil seals are a necessary barrier to maintain bearings and lubricants from external contamination during SKF bearing operation. No matter whether debris or moisture can penetrate into the bearing to prevent damage. Proper device maintenance is an important factor in maximizing the service life of bearings. At the same time, it is necessary to pay attention to the cleanliness of the bearing, the correctness of the bearing selection and the selection of appropriate equipment and maintenance tools. In addition, the bearings must be protected from contaminants and moisture and ensure proper installation and lubrication. Therefore, the design of the bearing arrangement, the condition of the oil seal, the type of lubricant and the lubrication cycle, and even the special support play the same and important role.
4. Mixed grease
If two incompatible greases are mixed, never mix incompatible greases. Usually, the consistency will become soft, and in the end, the bearing may be damaged due to the easy loss of grease. If you don't know which grease the bearing originally used, you must completely remove the old grease inside and outside the bearing before adding new grease.
5. Classification of oils and fats
SKF bearings that operate at a certain temperature affected by the operating temperature must be selected to have the correct consistency and good lubrication at the same temperature. Grease is manufactured in a wide range of operating temperatures and can be broadly classified into low temperature, medium temperature and high temperature greases. At the same time, it is mainly distinguished according to temperature and working conditions: grease can be classified according to its allowable operating temperature. One type of grease is called extrusion-resistant or extrusion-resistant and adds molybdenum disulfide, and an additive is added to enhance the strength of the lubricant film.

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The environment in which imported bearings are used and the choice of lubricants

According to the use of parts and conditions of use and environmental conditions to select specifications and accuracy, with the appropriate timken imported bearings is the premise to ensure bearing life and reliability.
1. Location: Tapered roller bearings are suitable for bearing radial and axial combined loads with radial loads. They are usually paired with two sets of timken bearings, mainly for front and rear hubs and active bevel gears of automobiles. , differential, reducer and other transmission parts.
2. Allowable speed: In the environment with correct installation and good lubrication, it is allowed to be 0.3-0.5 times of the limit speed of the imported bearings of timken. Under normal circumstances, it is best to use 0.2 times the limit speed.
3. Allowable tilt angle: Tapered roller bearings generally do not allow the shaft to tilt relative to the housing bore. If tilted, the maximum does not exceed 2'.
4, allowable temperature: under normal load, and the lubricant has high temperature resistance, and the lubrication is sufficient, the general bearing is allowed to work at -30 ° C -150 ° C ambient temperature.
Bearing grease selection
Improper lubrication accounts for 36% of the causes of premature bearing failure. General purpose greases do not meet the needs of a wide variety of special bearing applications. Only one or all common greases are used to meet all timken bearing applications. The problems caused will far outweigh the benefits of the unified brand. Bearing application conditions are very diverse, the correct lubrication is required to match the grease and bearing application conditions.
Bearing grease is the basis for smooth, worry-free operation and maximum reliability, even under the most extreme operating conditions. Grease prevents contaminants from entering the bearing, cushioning shock loads and preventing corrosion. Choosing the right grease in practical applications is the basic condition for obtaining the maximum service life of the bearing.
The criteria for proper lubricant selection include the type and size of the timken imported bearings, temperature, speed, load, and expected service life and relubrication cycle.

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