Heat, so that the metal and oil heat expansion, the oil out of the pores, and then the friction surface lubrication, bearing cooling, oil is sucked back into the pores.

Powder metallurgy oil bearing (oil bearing) is a kind of porous alloy products containing lubricating oil in the pores. When the shaft rotates, the temperature of the oil-bearing increases and the pumping effect is caused by the friction between the shaft and the oil-bearing. The lubricating oil contains leakage on the friction surface containing leakage on the inner or outer diameter of the oil bearing when the shaft stops rotating. The lubricating oil flows back inside the bearing. Therefore, the consumption of lubricating oil is very small, and it can be used for a long time without the supply of lubricating oil from the outside. It is very suitable for occasions where oil supply is difficult and lubricating oil pollution is avoided.

Oil bearing is widely used in: motor industry, automobile and motorcycle industry, home appliance industry, digital products, office equipment, power tools, textile machinery, packaging machinery and other machinery and equipment.

Powder metallurgy oil bearing is generally mainly made of raw material powder by pressing, sintering, shaping, oil immersion and other processes. Today's machines are mostly highly automated. The daily output is relatively large, and most products can be formed at one time, so the larger the batch, the better the production. And now the use of molds a little less may do hundreds of thousands of, more may do more than a million. However, the mold cost is relatively high, so it is difficult to do if the batch is small, and the time to replace the mold is long.

Powder metallurgy oil-bearing can generally be formed once, basically without cutting processing. The cost is lighter than machining, and the material waste is less, so the price is cheaper. It is also in line with the current national policy to promote energy conservation, so it is considered a technology that will not be outdated.