Cause damage to the engine bearings and characteristics
As the world's leading bearing SKF bearing, it is widely used. Each industry, the damage characteristics are also different. Today we take a look at the damage the engine bearings causes and characteristics.
(1), mechanical damage
Mechanical damage is the sliding bearing alloy bearing surface grooves of different degrees, severe surface of the metal strip in contact with a large area of the clutter and scratch; normal circumstances, the contact surface damage and ablation phenomena exist. Mechanical damage caused by the main bearing is difficult to form an oil film bearing surface or the film is severely damaged.
(2), bearing cavitation
The impact of the cylinder pressure bearing load) under repeated, the surface layer of plastic deformation and work hardening, partial loss of the deformation capacity, and gradually form a pattern and continues to expand, and with the shedding of debris in the surface layer formed by the points contained . Cavitation occurs when the general bearing, came first, pits, and then gradually expand this pit and cracking the alloy layer interface,slide bearing the crack extended along the direction parallel to the interface until the peeling up. The main bearing cavitation, due to structural elements such as grooves and hole cross-section caused by sudden changes in oil flow strong disorder, disorders of the vacuum in the area of oil flow to form bubbles, then the pressure increases, the bubble collapse point arising corrosion. Cavitation generally occurs in the high-load bearing areas, such as the crankshaft bearings on the lower main bearing.
(3), fatigue pitting
Bearing fatigue pitting is due to overload of work the engine, making the work of overheated bearings and bearing gap is too large, causing the central bearing fatigue damage, fatigue pitting or fatigue off. Most of this damage because of overloading, the bearing gap is too large, or dirty oil, mixed with foreign matter in due. Therefore, the use of bearings should be taken to avoid overloading of work, not to low or high speed operation; idle the engine to adjust to a steady state; to ensure the normal bearing clearance, to prevent the engine speed is too high or too low; check and adjust the cooling system work to ensure that the engine operating temperature suitable. Flanged Ball Valve
(4), bearing alloy corrosion
Bearing alloy corrosion is generally impure area for oil, lubricating oil platform in the chemical impurities (acid oxides, etc.) to produce bearing alloy acid oxidation, causing part of the off bearing alloy, the formation of irregular small hole or pit pit. Bearing alloy corrosion is mainly due to the improper selection of lubricants, bearing materials, poor corrosion resistance, or the gross engine, the temperature is too high.
(5), bearing Shaorong
Friction between the journal and bearing small raised metal surfaces are in direct contact, the formation of local temperature, insufficient lubrication, cooling under adverse conditions, so that black or partial Shaorong bearing alloy. This failure often caused by too tight with the journal and bearing; lack of oil pressure bearings are easily burned.
(6), take the cylindrical bearings
Take the cylindrical bearing hole here is that there is relative rotation bearing. Cylindrical bearings go, not only of bearing the heat, easy to make the bearing surface alloy ablation, but also the bearing back injury, severe burn bearings. The main reason is bearing too short, convex tenon damage, processing or installation does not meet the norms.
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