The principle of lubricating oil lubrication is to reduce friction. The so-called friction refers to that when two relative moving surfaces are relatively displaced under the action of external forces, there is a relative contact surface, called the friction surface.
There are many kinds of friction phenomena, such as external friction, internal friction pushing sliding friction, rolling friction, dry friction, boundary lubrication friction, fluid lubrication friction mixed lubrication friction and so on.
Friction caused by the apparent phenomena such as high temperature, high pressure, noise, loss, etc.
Among them, the most harmful is wear, wear has adhesive wear, abrasive wear, erosion wear, surface fatigue wear and other types, it directly affects the normal operation of mechanical equipment and even failure.
The role of lubricating oil is to form a protective film between the two friction pairs, to avoid direct contact between metal and metal, thus buffering the effect of friction, lubrication, reduce wear and tear, so that the normal operation of machinery.
This protective film can be physical adsorption film but chemical adsorption film or oxide film, film thickness and strength directly affect the lubrication
The lubrication function of ordinary lubricating oil is mainly to form a layer of oil film between the friction surface for protection. The lubrication theory of lubricating oil is to rely on the additive to form an adsorption film on the friction surface for protection
The base oil itself only plays a sealing role between the additive carrier and the friction surface, and the lubrication role of the oil film has withdrawn to a secondary position.
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