Engine sliding SKF bearing damage - bearing the characteristics of knowledge

As the world's top bearings SKF bearing, application is very broad. The characteristics of each industry, its damage is also different. Today let's look at the engine damage characteristics of sliding bearing. ( 1) Sliding bearing, mechanical damage mechanical damage refers to bearing alloy surface appear different degree of the trench, serious when in contact surface metal strip and a large area of scratches; Under normal circumstances, the contact surface damage and ablation phenomenon exist at the same time. Bearing mechanical damage is the main reason of the difficult to form the oil film bearing surface or oil film were severely damaged. ( 2) Cavitation, bearing sliding bearing in cylinder pressure impact load) Under the action of repeated, surface plastic deformation and cold work hardening, local loss of deformation ability, gradually formed and expanded, and then with the shedding of wear debris, formed in the surface layer loaded cavity. The cavitation, general bearing shell pits is first appeared, and then gradually expand the pits of the interface crack, and lead to an alloy layer along the interface crack parallel to the direction of extension, until it is peeling off. Sliding bearing is the main reason of the cavitation, due to structural elements such as oil groove and oil hole of the cross sectional sudden change flow caused by strong disturbance, in the vacuum area of the flow disorder form bubbles, then because of the pressure, generate cavitation bubble breaking. Cavitation 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 clearance is too large, central bearing fatigue damage and fatigue pitting or fall off. This kind of damage is mostly to overload, bearing clearance is too large, or lubricating oil is not clean, and mixed with caused by foreign bodies. Therefore, when using, should pay attention to avoid bearing overload work don't too low or too high speed operation; To adjust the engine to idle speed stable state; To ensure the normal bearing clearance, prevent engine speed too high or too low; Check, adjust the performance of the cooling system, to ensure that the engine working at a comfortable temperature. ( 4) , bearing alloy corrosion bearing alloy corrosion is generally area for the lubricating oil is not pure, lubricating oil in the chemical impurities ( Acidic oxides, etc. ) Make bearing alloy oxidation and acid generated, cause bearing alloy parts fall off, forms the rule of no small hiatal or small pits. Bearing alloy corrosion is the main reason of the improper selection, bearing lubricating oil material corrosion resistance is poor, or the engine work violent, the temperature too high. ( 5) Burning-out journal and bearing, bearing friction pair between have tiny bumps on metal surface, direct contact form local high temperature, in the case of insufficient lubrication, cooling, make or local burning-out bearing alloy were black. This failure is often caused by journal and bearing with tight; Insufficient pressure lubricating oil is easy to make the bearings burned. ( 6) , bearing cylindrical bearing walk outside the circle is bearing hole with relative rotation here. Cylindrical bearing go after, not only affect the heat dissipation of bearing, easy to make alloy bearing inner surface ablation, but also can make the bearings on the back of the injury, serious when burning bearing. The main reason is that the bearing are too short, tenon damage, processing or installation does not conform to the specifications, etc.