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Plain bearings and sleeve bearings use several surface materials. Some plain bearings and sleeve bearings are surfaced with oil-impregnated hardwood, usually in agricultural applications. Others contain self-lubricating surfaces made of molten graphite and metal. Since some applications run the bearing on less than full-film lubrication it is important to select the proper bearing materials and design.

Plain and sleeve bearings are available with several different features.

Self-lubricating or oil impregnated bearings do not require any external lubrication. Sintered bronze can be impregnated with oil. The principle behind self-lubricating bearings is that, during the initial run-in period of the bearing, there will be a solid lubricating film created by the transfer of a small amount of material from the bearing layer. The film comes into direct contact with the moving parts and protects the mating component to extend the service life of the bearing. Proper lubrication is a critical component of safe and efficient bearing operation. Poor lubrication can lead to fast material wear and machinery breakdowns. There are several advantages of self-lubricating bearings. These include: elimination of oil holes and grooves which cost money to machine, reduction of the machinery running cost since there is less maintenance required, simplified mechanical design of thicker walls and excellent wear resistance, and a safer environment without the dependency for oil lubricants.

Extreme environments, including high or low temperatures, humidity, shock, and vibration require fag bearings that are durable, dependable, and made of a material that can withstand the most extreme conditions.

The full range of ambient operating temperatures, including those on a day-to-day basis must also be considered. The changing temperatures can affect the distance between the bushing and housing or between the bushing and shaft. If the distance becomes too small it can cause severe wear to the bushing and reduce the service life.

Plain bearings and sleeve bearings are designed for extreme environments and can withstand high or low temperatures. Others are suitable for hazardous environments with high levels of shock and vibration. Applications for plain bearings and [sleeve bearings] include food processing machinery, home appliances, packaging equipment, office machines, and automotive equipment.

There are two broad types of bearings used in machinery today: plain and rolling element bearings. This article targets the special lubrication requirements of plain bearings, also known as sleeve bearings and journal bearings.The plain bearing consists of a shaft, also called a journal, and a supporting component, which may be a shell around the shaft called a sleeve, a half shell that the shaft fits into koyo bearings , two half shells (top and bottom parts) or a multipart shell.

ROLAMENTO ROL CILIND.FAG/NU2313ETVP2C3  

ROLAMENTO ROL CON 66225 66462D TIMKEN   

ROLAMENTO ROL CONIC.SKF/30302J2