Patent ID: 7211219

Claim:
A method of manufacturing an oil-impregnated bearing, comprising: pressure-forming a raw material powder to obtain a pressed powder body; forming a sliding face on an inner peripheral face of the pressed powder body by closing pores which have been opened in the inner peripheral face; making a density in a section of the pressed powder body preserving oil pressure higher than in an adjacent section of the pressed powder body, the section preserving oil pressure extending from the sliding face toward an outer side of the pressed powder body; and sintering the pressed powder body to provide a bearing main body, wherein, in a cavity for pressure-forming said pressed powder body, more raw material powder is filled in a part where the section preserving oil pressure is to be provided than in an adjacent part, and a compression rate of the raw material powder during pressure-forming is higher than in the adjacent part, thereby making the density in said section preserving oil pressure higher than in an adjacent section of said bearing main body.