Oil-impregnated sintered bearing and production method therefor
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United States of America Patent
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Sep 13, 2016
Grant Date -
Apr 25, 2013
app pub date -
Oct 19, 2012
filing date -
Oct 24, 2011
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Abstract
An oil-impregnated sintered bearing which does not tend to produce squealing noises is provided. The oil-impregnated sintered bearing can be used as a bearing of an electric motor that may be intermittently used for a short time, such as a bearing of a window regulator motor. The oil-impregnated sintered bearing includes pores that include middle-sized pores with circle-equivalent diameters of 45 to 63 μm at 0.9 to 2.5%, interparticle pores with circle-equivalent diameters of 63 to 75 μm at 0.1 to 1.2%, and large interparticle pores with circle-equivalent diameters of larger than 75 μm at not more than 3%, with respect to the total number of the pores.
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