Oil-impregnated sintered bearing and method for manufacturing same
AssigneeNtn Corporation
InventorsShinji Komatsubara, Yoshinori Ito, Tadahiro Uchiyama
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Abstract
An oil-impregnated sintered bearing (8) includes a copper-iron-based sintered compact containing 40 mass % or more of copper, and has inner pores impregnated with an oil. The sintered compact has: a copper structure derived from copper powder (13) of partially diffusion-alloyed powder (11) in which copper powder (13) having a particle diameter of 20 μm or less is diffused on and joined to a surface of iron powder (12) in advance; and a copper structure derived from elemental copper powder (14).
Claims15
An oil-impregnated sintered bearing, comprising a copper-iron-based sintered compact containing 40 mass % or more of copper,
- wherein the sintered compact has:
- a copper structure derived from copper powder of partially diffusion-alloyed powder in which copper powder having a particle diameter of 20 μm or less is diffused on and joined to a surface of iron powder in advance;
- and a copper structure derived from elemental copper powder.
A method of manufacturing an oil-impregnated sintered bearing comprising a copper-iron-based sintered compact containing 40 mass % or more of copper, the method comprising the steps of:
- mixing partially diffusion-alloyed powder in which copper powder having a particle diameter of 20 μm or less is diffused on and joined to a surface of iron powder and elemental copper powder to produce raw material powder;
- compression-molding the raw material powder to provide a green compact;
- sintering the green compact to provide a sintered compact;
- subjecting an inner peripheral surface of the sintered compact to sealing treatment by extending a material of a surface layer on the inner peripheral surface by pressing;
- and
- impregnating inner pores of the sintered compact with an oil.
Dependencies are inferred from the claim text.