Although oil bushing may form a complete oil film, in most cases, it is in a frictional state of mixing with an incomplete oil film. Oil bushing liner materials that can fill lubricating oil holes with the porous properties of materials include: wood, cast iron, cast bronze alloy, and powder metallurgy friction reducing materials; The affinity between the material and the lubricating oil can be utilized to evenly disperse the lubricating oil in most oil-bushing liner materials, which are polymers such as oil-containing phenolic resin and oil-containing bronze sleeve.

has the characteristics of low cost, vibration absorption, low noise, and no need to add lubricating oil for a long time, especially suitable for difficult to lubricated or do not allow oil dirty working environment. Porosity is an important parameter of oil-immersed bushing. Oil-immersed bushing with high speed and light load requires high oil content and high porosity; Oil bushing operating at low speeds and heavy loads requires high strength and low porosity.