| 摘要 |
PROBLEM TO BE SOLVED: To provide an oil-impregnated sintered bearing which can reduce the abrasion of the bearing itself while reducing an abrasion of a shaft even in a high surface-pressure condition, and to provide a method for manufacturing the same. SOLUTION: The oil-impregnated sintered bearing presents a metal structure in which a matrix part except pores comprises: a copper alloy phase including Cu and at least one element of Sn, Zn, Ni and P; a ferrite phase; and an iron oxide phase which is dispersed in the ferrite phase. More preferably, the copper alloy phase has a composition comprising, by mass%, 10 to 59% of Cu, and 1 to 5% of at least one element among Sn, Zn, Ni and P, the iron oxide phase occupies 3 to 20% of the matrix part except the pores by a cross-sectional area ratio, and the ferrite phase of the balance consists of Fe and unavoidable impurities. COPYRIGHT: (C)2008,JPO&INPIT
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