The service life of self-lubricating powder metallurgy bushings is usually determined by the amount of lubrication in the suction pores.

Powder metallurgy technology is currently one of the methods that can reduce the waste of raw materials as much as possible, according to the high-precision level, and the lowest cost, one of the methods for mass production of complex parts.

The hollow powder metallurgy bushing for automobiles is one of the first parts produced by powder metallurgy technology, and it is still mass-produced by this technology. The main advantage of hollow bushings is that they can be vacuum impregnated with appropriate non-resin lubricating oil to facilitate These bushes do not need to be lubricated during the entire life of the installation.

When the shaft runs in the porous bushing, the lubricating oil precipitated in the pores rides on the lubrication effect. When the shaft stops, due to capillary action, the lubricating oil is sucked back into the pores. Although it is possible for oil-impregnated bearings to form a complete oil film, in most cases, this type of bearing is in a state of mixed friction with an incomplete oil film.

Powder metallurgy bearings are widely used in: automobile industry, electric tools, motor industry, automobile and motorcycle industry, office equipment, home appliance industry, digital products, textile machinery, packaging machinery and other mechanical equipment.