Metallurgical bearings are made by pressing, sintering, shaping and immersing metal powders and other antifriction materials. They have a porous structure. After being soaked in hot oil, the pores are filled with lubricating oil. Suction and frictional heating cause the metal and oil to expand by heating, extruding the oil out of the pores, and the friction surface acts as a lubricant. After the bearing cools, the oil is sucked back into the pores.

Metallurgical bearings are a class of porous alloy products whose pores are impregnated with lubricating oil. When the shaft rotates, the temperature of the oil-containing bearing rises and the pumping effect is caused by the friction between the shaft and the oil-containing bearing. The lubricating oil is impregnated from the frictional surface containing the inner or outer diameter of the oil bearing when the shaft stops rotating. The lubricating oil returns to the inside of the oil bearing. Therefore, the consumption of lubricating oil is very small, and it can be used for long-term operation without supplying lubricating oil from the outside. Very suitable for occasions with difficult oil supply and avoiding oil pollution.

The metallurgy oil bearing has been filled with lubricating oil by vacuum impregnation in the substrate, and the lubricating oil will leak to the running surface due to temperature rise and pumping during operation, so it can be used without additional lubricating oil The occasion.