For light load SKF bearings, short life of the bearing noise and lubrication life in bearing fatigue life. Such as household appliance bearings, as long as the selection and installation of bearing the correct, fully meet the host′s life matches the requirements.
SKF bearings during the working, bear the load, even if it is a static load, but for steel ball and roller track, their stress is cyclical, rolling fatigue of materials which the bearings to achieve longevity. The phenomenon as part of a rolling surface materials like fish scales, suddenly fall off, a phenomenon known as fatigue spalling.
The most common additives are antioxidants, rust stains, anti-foaming agent, anti-wear agents, and EP additives.
Antioxidants
When the operating temperature of the lubricating oil is high and has tried to contact are produced by oxidation with air, producing compounds made viscosity change and cause corrosion. Antioxidants may improve oxidation stability of oils to more than a factor of 10.
Antirust additives
There are two kinds of additives to prevent corrosion, water-soluble additives, such as sodium nitrate and oil-soluble additives, such as promoting agent.
Anti-wear additive
Many additives in oil film could not be established in the metal contact, reducing wear and tear. These commonly known as wear-resistant additives, can form a protective layer on the metal to prevent wear.
They can prevent two direct contacts, even in only a very thin layer of molecules between the two surfaces
Reactive EP additives
Most of EP additives containing phosphorus, chlorine and sulfur compounds, up to now, still don′t know how it will work, they combine with the metal, so that the surface of the compound than the original metal soft, easily worn away, so as to prevent direct contact with the metal surface and fused together.
For heavy-load bearings, SKF bearings for rolling mills, usually grease containing EP additives is recommended because these additive increases the load capacity of the oil film. It turns out that most of the additives are lead compounds, and proved a poor lubrication may extend bearing life. However, for environmental reasons, many manufacturers are replaced by other compounds, these compounds, and some are corrosive, in some cases, it will reduce the bearing life.
To be extra cautious when selecting EP lubricant, SKF bearings with your vendor additive materials harmless for some known good lubricant to inspect the structure to ensure it did not change in ingredients.