Engine sliding SKF bearing damage features
Smart Wall-Hung Toilet,swimming pool and spa,spa hydropool,swim spa accessories,inground spa pool Guangzhou Aijingsi Sanitary Products Co.,Ltd , https://www.infinityedgehottub.comFeatures of Engine Sliding SKF Bearing Damage
As one of the leading global bearing manufacturers, SKF bearings are widely used in various industrial applications. Each type of bearing has its own unique characteristics when it comes to failure modes. Today, we'll take a closer look at the typical features of damage in engine sliding SKF bearings.
(1) Mechanical Damage
Mechanical damage to a sliding bearing usually appears as grooves or scratches on the alloy surface. In severe cases, metal flaking and large-scale irregular scratches can be observed, often accompanied by burn marks on the contact area. This kind of damage typically occurs when the oil film on the bearing surface is not properly formed or is severely damaged, leading to direct metal-to-metal contact.
(2) Cavitation Effect
Cavitation happens due to repeated pressure impacts from the cylinder, causing plastic deformation and cold work hardening on the outer layer of the bearing. Over time, this reduces the material’s ability to deform, leading to pattern formation and expansion, followed by wear debris and eventual hole formation on the bearing's outer surface. The primary cause of cavitation is the turbulent flow of oil caused by poorly designed oil slots and holes, which leads to bubble formation in low-pressure areas. When these bubbles collapse, they create shock waves that damage the bearing. Cavitation commonly occurs in high-load areas, such as the lower main bearing of the crankshaft.
(3) Fatigue Pitting
Fatigue pitting refers to damage that occurs in the middle of the bearing due to overload, overheating, or excessive clearance. This type of damage results in small pits or cracks that eventually lead to material loss. It is often caused by overloading, improper lubrication, or the presence of foreign particles in the oil. To prevent this, it's important to avoid overloading the bearing, maintain stable idle conditions, ensure proper clearance, and regulate engine speed and cooling system performance.
(4) Corrosion of Bearing Alloy
Corrosion of the bearing alloy typically occurs when the lubricating oil is contaminated with chemical impurities like acid oxides. These substances can oxidize the bearing material, leading to the formation of acidic compounds that cause small holes or pits on the surface. Poor oil selection or inadequate corrosion resistance of the bearing material can also contribute to this issue. High engine temperatures can further accelerate the corrosion process.
(5) Burning Due to Lack of Lubrication
When there's insufficient lubrication or poor cooling, the bearing can become overheated, leading to blackening or partial melting of the bearing alloy. This often happens due to improper alignment between the journal and the bearing, or when the oil pressure is too low. In extreme cases, the bearing can completely fail due to burning.
(6) Outer Circle Deformation
The outer circle of the bearing may experience deformation within the housing, affecting heat dissipation and causing uneven wear. Severe deformation can lead to damage on the back surface of the bearing, potentially resulting in burning. This issue is usually caused by an improperly sized bearing, damage to the crown, or substandard manufacturing.
**Related Bearing Knowledge**
- The fundamental principles of smooth bearings
- Preparations for SKF bearing installation
- How to test KOYO bearings
- New developments in energy-efficient SKF bearings
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