Engine sliding bearing damage reasons and characteristics

Bearing use very extensive. Each work, the damage is characterized not the same. Today we take a look at the characteristics of the engine and cause damage to the plain bearings.
(1), mechanical hazards
Bearing mechanical hazard refers to the surface of the pad of the oil-bearing alloy is not the same degree of grooves, serious contact surface occurs when a large area of ​​metal peeled and messy scratch; under normal conditions, the contact surface with the appearance of damage and erosion exist. The primary reason constitute bearing mechanical hazards is difficult to form the bearing surface of the film or the film is seriously damaged.
(2), bearing cavitation
Under the impact of sliding bearings in the cylinder pressure load) repeated action, the surface layer of self-lubricating bearings plastic deformation and work hardening, and some loss of deformation ability, and gradually form lines and continue to broaden, and then follow the falling debris, contained in the surface layer by constitute points. General bearing cavitation occurs, came first pit, and then gradually expand this pit and causes cracking of the alloy layer interface, the crack widening along a direction parallel to the interface until the fall aborted. Bearing Cavitation primary reason is, since the slide bearing grooves and oil holes and other planning elements of the cross section resulting in a sudden change of oil flow severe disorders, loss of tone in the oil vacuum zones constitute bubbles, then as pressure increases, while the bubble collapse cavitation occurs. Cavitation occurs in high load bearing areas, such as under the pad on the crankshaft main bearings.
(3), fatigue pitting
Bearing fatigue pitting refers to, since the engine work overload, overheating and bearing so that the bearing space is too large, constitute the central bearing fatigue hazards, fatigue pitting fatigue may fall. Most of this hazard is due to overloading, the bearing clearance is too large, the lubricant may not clean, mixed with the formation of foreign body. Thus, about the use of attention to prevent bearing overload of work not to low or high speed work; idling engine to adjust to a stable situation; ensure proper bearing space, to prevent the engine speed is too high or too low; check and adjust cooling work status of the system to ensure proper engine operating temperature.