The conclusions drawn from the many practical applications process, the trial FAG Bearings can greatly increase the service life of the bearings. However, if in the course of an accident injury, can lead to reduced life expectancy, or simply can not trial. This early damage is often referred to as a breakdown or accident. Such an accident caused by a variety of reasons, but mostly due to installation, lubrication the trial specifications improper lock cause the.
The damage state of the bearing, such as roller bearing ring ribs abrasions, the reason may be the lubricant is insufficient, inappropriate grades, a defect in the oil supply and discharge structure, intrusion of foreign matters, the bearing misalignment or shaft deflection is too large, there may be various reasons above consolidated caused.
Therefore, only investigated the damage is difficult to know the real cause of the injury. However, if you fully understand the use of FAG bearings based on machine, working conditions, and its peripheral structure and clarify the failure occurred before and after the situation analysis combined with bearing damage and a variety of related causes, we can prevent similar failures again . Representative bearing damage causes and countermeasures.
Even the the contemporary most manufacturing technology and processing FAG bearing parts. Observe the changes in the method of its readings with the pretension load. The preload method has its negative aspects, as we all know. Its the work appearance always kept the dial gauge head against the appropriate parts of the end bearings or shaft.
1. Mechanical damage
Serious when in contact with the outer metal stripping occurs, as well as a large area of clutter scratch; under normal circumstances, the the FAG bearing mechanical damage is alloy outer bush there are different levels of grooves. The contact surface damage and ablation phenomena exist bearing mechanical damage caused mainly due to the FAG bearing looks difficult to form a film or film is severely damaged.
2. Bearing cavitation
The outer surface plastic deformation and cold hardening, plain bearings in the cylinder pressure shock loads) under repeated. Partial loss of deformability, and gradually form a pattern and continues to expand, and then with the shedding of debris by the carrier outer surface to form a hole. General bearing cavitation occurs first pit, this pit then gradually expand and cause cracking of the alloy layer interface, the crack along the interface parallel to the direction of extension, until flaking far. Sliding bearing cavitation mainly due to the cross-section of the structural elements, such as oil groove and oil hole sudden change caused by strong oil flow disorders, the oil flow disorders vacuum region is formed bubbles, and then the pressure increases, the bubble collapse and cavitation. Cavitation generally occurs in the high load region of the bearing, such as on the lower pad of the crankshaft main bearings.
3. Fatigue pitting
Due to the the engine work overload, of FAG Bearings fatigue pitting refers. FAG Bearings overheating and excessive bearing clearance, to cause bearing central fatigue damage the fatigue pitting or fatigue shedding. Most of this damage because of the overload, the bearing clearance is too large, or oil dirty within mixed due to a foreign body. Therefore, when used should be noted that to prevent the bearing overload work not to excessively low or high speed operation; idle To engine adjusted to a steady state; ensure proper bearing gap, to prevent the engine speed is too high or too low; check, adjust the cooling system work, and work to ensure that the engine temperature is suitable.
4 bearing alloy corrosion
The lubricants are chemical impurities alloy oxidation generates an acidic substance (acidic oxides, etc.) so that the bearing, the bearing alloy corrosion area for lubricants impure. Cause bearing alloy partial loss, the formation of irregular tiny hole or small pit. The bearing alloy corrosion mainly due to the improper selection of lubricants, the FAG bearing information poor corrosion resistance, or the operation of the engine and rude, the temperature is too high.
5. Bearing Shaorong
Formation of local high temperature, the tiny bumps metal surface direct contact between the journal and the bearing friction Vice. The lubrication lack the cooling bad circumstances, the bearing alloy black or partially welded shut. This failure is often due to the journal bearing fit too tight; lack of lube oil pressure also easy to make bearings burned.



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