Note specification bearing

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Rolling sound, we briefly introduce the bearing rolling size and sound quality of the sound check should be checked Sounding bearing operation with advanced tools to accurately judge the proble m lies, bearing even with slight peeling damage, will be issued by the abnormal tone and irregular sound Sounding be able to tell.
Then, bearing vibration check to see if the bearing damage is very sensitive, whether peeling, indentation, corrosion, cracks, wear, etc. will be reflected in the bearing vibration measurement, through the use of special bearing vibration measurement (frequency analyzer ) measures the size of the vibration frequency can not infer the specific circumstances of unusual. However, the measured values ​​of each machine bearing the use conditions or the sensor mounting position, etc., and therefore requires prior of each machine measured values ​​were analyzed and compared to determine the criterion.high speed bearings
1. Mechanical damage
Serious when in contact with the outer metal stripping occurs as well as a large area of ​​clutter scratch; Under normal circu mstances, the bearing mechanical injury refers to the bush alloy outer grooves of different levels. Contact surface damage and ablation phenomena exist that the main reason for bearing mechanical damage is the bearing looks difficult to form a film or film has been 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 disord ers, 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
Overworked engine bearing fatigue pitting. Bearing 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 lubricant s 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 improper selection of lubricants, bearings poor corrosion resistance, or the operation of the engine and rude, the temperature is too high.buy bearing
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.