A sleeve bearing is some sort of cylindrical ball bearing. It got its name from which has a single internal rotating cylinder within it. Sleeve bearings are porous, so they really draw up the oil applied over the outer sleeve and are known as self-lubricating.

Sleeve bearings are an plain bearing--that is, soccer ball bearings with few going parts. Many spherical ball bearings present an internal ring, which is usually lined with smaller tennis balls inside. In contrast to help regular ball bearings, some sort of sleeve bearing only comes with two moving parts; the outer sleeve and also the inner rotating cylinder. Also, they are known as journal bearings, after the technical term for the outer sleeve. The outer journey of an sleeve bearing may end up whole, split, or clenched relating to the two halves.

Sleeve bearings are constructed of compressed powdered metal, like bronze or copper. Due to the material from which they are made, the metal is actually microscopically porous. When they are oiled on the exterior, the oil will be drawn up through the pores to lubricate the inner cyndrical tube.

A sleeve bearing can be lubricated in a number of ways besides oiling. Sometimes, molten metal or graphite is utilized. Some man-made polymers may well lubricate moving parts without the need of seizing up in extremely cold temperatures. Other sleeve bearings are generally surfaced with porous, oiled hardwood so the oil will be used into them more easily.