Bearing is very extensive use.Each kind of work, the characteristic of the damage is different also.Today let's look at the engine damaged reasons and characteristics of sliding bearing.
(1), mechanical damage
Sliding bearing mechanical harm is refers to the bearing alloy surface, no oil bearing different degree of the trench, serious when in contact surface metal strip and a large area of scratches;General situation, contact surface damage and the ablation surface exist together.Bearing mechanical damage is the first reason of difficult to form the oil film bearing surface or the oil film was seriously damaged.
(2), bearing the cavitation
Sliding bearing in cylinder pressure under the action of repeated impact load), surface self-lubricating bearing occurred plastic deformation and cold work hardening, some lost deformation ability, gradually form and expanded, and then follow the abrasive dust falling, hole is made in the loading surface layer.The cavitation, general bearing shell pits is first appeared, and then the pits expanded, and the alloy layer of interface crack, crack expand along the interface of the parallel direction, until the fall.Sliding bearing is the first cause of cavitation, as a result of sliding bearing oil groove and oil hole cross section of the planning elements such as the likelihood changes the oil flow severe imbalance, in the vacuum area of the oil flow disorders constitute a bubble, then because of the pressure, the cavitation. Bubbles breaking andCavitation occurs commonly in high load bearing, such as the crankshaft main bearing on the lower bearing.
(3), fatigue pitting
Bearing fatigue pitting refers to, because the engine to work overtime and make bearing overheating and bearing space is too large, constitute the central bearing fatigue damage, fatigue pitting perhaps tired to fall.The damage is mostly due to the large overload, bearing clearance, perhaps lubricating oil is not clean, and mixed with foreign body.Therefore, when using about care to prevent bearing overload work don't work at too low or too high speed;To adjust the engine to idle condition;Ensure that the normal bearing, prevent engine speed too high or too low;Check and adjust the working condition of the cooling system, ensure the working temperature of engine.
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> Industry newsReasons and Characteristics of engine bearing damage
2016-05-18
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