Operating Principle Of Oil Bushing

By utilizing the porosity of the material or its affinity with the lubricant, the lubricant can be immersed in the oil bushing material before installation and use, and the bushing can be operated for long periods of time without or without lubricant. This type of bushing is called an oil bushing. When the oil bushing is in a non working state, the lubricating oil of the oil bushing will fill its hole.

During operation, the shaft rotates and generates heat due to friction. The thermal expansion of the oil bushing liner reduces air holes, causing lubricating oil to overflow and enter the bushing gap. When the oil bushing stops rotating, the bushing shell cools, the air holes recover, and the lubricating oil is sucked back into the air holes.

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.

Oil bushing 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.