Sintered oil-impregnated bearing and manufacturing method thereof
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United States of America Patent
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app pub date -
Aug 19, 2005
filing date -
Aug 19, 2004
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Abstract
The disclosed invention provides a sintered oil-impregnated bearing equipped with a bearing hole having a clearance structure, in which a clearer boundary is formed between the bearing surface and the clearance surface, and a manufacturing method thereof. In a bearing hole of a radial bearing, a bearing surface and another bearing surface are formed at both ends in an axial direction, and a clearance surface is formed between both the bearing surface and the bearing surface. The bearing surfaces are formed by a sizing step for a compression-molded piece that is formed by a compression molding step. In the sizing step, diameter-reduction manufacturing is carried out for an end of the compression-molded piece to form a diameter-reduced section, and then afterward, a sizing core is inserted into the bearing hole of the compression-molded piece so as to eventually form the bearing surface.
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