Powder metallurgy bearing metal powder and other anti-friction material powder pressing, sintering, plastic and oil-soaked from the porous structure and infiltration in the hot oil in the pore space filled with lubricating oil, and journal rotating pumping worksuction and friction heat, metal and oil to heat expansion, and oil out of pores, and thus the friction surface of a lubricant, bearing cooling, the oil being sucked back into the pores.

Powder metallurgy bearings do not need to add the oil in a long time.
 Powder metallurgy bearing higher porosity reservoir more pores the more the lower the intensity.

These bearings often in mixed lubrication, sometimes to the formation of thin film lubrication, supplementary lubricant difficulties and light loads and low speed.



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