It has the characteristics of low cost, vibration absorption, low noise, and no need to add lubricating oil in long working hours. It is especially suitable for the working environment which is not easy to be lubricated or not allowed to be dirty with oil.Porosity is an important parameter of oil-bearing.Oil bearing working at high speed and light load requires high oil content and high porosity.Oil bearing working at low speed and under large load requires 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. It has become an indispensable basic part for the development of various industrial products such as automobiles, home appliances, audio equipment, office equipment, agricultural machinery and precision machinery.Oily bearing is divided into copper base, iron base, copper iron base, etc.
Using the porous characteristics of the material or the affinity characteristics of the lubricating oil, before the installation and use of the bearing bush, the lubricating oil can be infiltrated into the bearing bush material, and the bearing can be done without or without lubricating oil for a long time during the working period. This kind of bearing is called the oil-bearing.Oily bearing in the non-operating state, the lubricating oil is full of its pores, running, shaft rotation due to friction and heat, bearing bush thermal expansion to reduce the pores, so that the lubricating oil overflow into the bearing clearance.When the shaft stops rotating, the bearing bush cools, the pores are restored, and the lubricating oil is sucked back into the pores.
Although it is possible for oil-bearing to form a complete oil film, in most occasions, this kind of bearing is in the mixed friction state of incomplete oil film.The oil bearing bush materials that can make use of the porous properties of the material to make the lubricating oil full of pores are: wood, growing cast iron, cast copper alloy and powder metallurgy antifriction materials;The affinity between the material and the lubricating oil can be used to make the lubricating oil evenly dispersed in the material. Most of the oil-bearing bearing materials are polymers, such as oil-bearing phenolic resin.Working principle of process oil bearing.