Sintered oil-impregnated bearing

Active Publication Date: 2020-06-11
DIAMET CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Benefits of technology

[0020]The sintered oil-impregnated bearing of the present invention contains: 15 to 30% by mass of Cu; 1 to 4% by mass of C; and the remainder consisting of Fe and inevitable impurities, in which the metal structure with copper being melted therein is provided at least on the bearing surface; pearlite or the pearlite with ferrite being partially scattered therein, the copper-rich phase and the free graphite are all provided in the matrix. In this

Problems solved by technology

Further, the problem with the conventional bearings used in these motors is that in addition to the fact that a bearing often collides with a shaft due to vehicle vibration, the use condition has now become more severe than before, which has led to an insufficient wear resistance.
However, these materials are such that depending on a sintering condition(s), a large amount of a hard cementite may be precipitated by the reaction between iron and graphite so that wear may progress as a mating shaft member will be damaged thereby; and are such that even with the precipitation of a hard cementite being suppressed by performing sintering at a low temperature at which iron and graphite are less likely to react with each other, the strength of a

Method used

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  • Sintered oil-impregnated bearing
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  • Sintered oil-impregnated bearing

Examples

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working example

[0043]As a raw material powder(s), there were prepared a reduced iron powder for powder metallurgy, an electrolytic copper powder and a graphite powder. Particularly, as a copper powder, an electrolytic copper powder having a given average particle size was used, except that in comparative example 5, an atomized copper powder having a small average particle size was used; and that in comparative example 6, an electrolytic copper powder having a large average particle size was used. As a graphite powder, a crystalline graphite powder or flake graphite powder having a given average particle size was used, except that in comparative example 7, an artificial graphite powder having a small average particle size was used; and that in comparative example 8, a crystalline graphite powder or flake graphite powder having a large average particle size was used.

[0044]These raw material powders were mixed together so that a final component composition(s) shown in Table 1 could be achieved. A zinc s

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Abstract

Provided is a novel sintered oil-impregnated bearing superior in wear resistance and cost performance under a severe use condition where the bearing collides with a shaft due to a high load and vibration, such as a condition associated with an output shaft of an electric motor installed in a vehicle and a wiper motor installed therein. The sintered oil-impregnated bearing contains: 15 to 30% by mass of Cu; 1 to 4% by mass of C; and a remainder consisting of Fe and inevitable impurities, in which a metal structure with copper being melted therein is provided at least on a bearing surface; pearlite or a pearlite with ferrite being partially scattered therein is provided in a matrix; a copper-rich phase arranged in a mesh-like manner is also provided in the matrix; and a free graphite is dispersed and distributed in the matrix as well.

Description

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Claims

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Application Information

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Owner DIAMET CORP
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