What are the characteristics of oil-impregnated bearings?

Update: 12-03-2021

What are the characteristics of oil-impregnated bearing […]

What are the characteristics of oil-impregnated bearings?
Oil-impregnated bearings, or Porous Bearings, use metal powder as the main raw material to produce a sintered body by powder metallurgy. The sintered body is originally porous and has a number of pores that can be adjusted freely during the manufacturing process. Technical advantages such as size, shape and spread. Using the porosity of the sintered body, it is impregnated with 10% to 40% (volume fraction) of lubricating oil and used in the state of self-supplying oil. During operation, the temperature of the bearing rises. Because the expansion coefficient of oil is larger than that of metal, it automatically enters the sliding surface to smooth the bearing. When the operation stops, the oil is sucked back into the pores as the temperature drops.

Oil-impregnated bearings have the characteristics of low cost, vibration absorption, low noise, and no need to add lubricating oil in a long working time, and are especially suitable for working environments that are not easy to be smooth or are not allowed to be dirty.

Porosity is an important parameter of oil-impregnated bearings. Oil-impregnated bearings operating at high speeds and light loads require high oil content and high porosity; oil-impregnated bearings operating at low speeds and heavy loads require high strength and low porosity. This kind of bearing was invented in the early 20th century. Because of its low manufacturing cost and convenient use, it has been widely used. Now it has become indispensable for the development of various industrial products such as automobiles, home appliances, audio equipment, office equipment, agricultural machinery, and precision machinery. One of the basic parts.

Oil-impregnated bearings are divided into copper-based, iron-based, copper-iron-based and so on.