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US 7,771,125 B2Granted
Retainer for rolling bearing, and rolling bearing
AssigneeNtn Corporation
InventorsMasakazu Hirata, Hideyuki Tsutsui
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AssigneeNtn Corporation
InventorsMasakazu Hirata, Hideyuki Tsutsui
Estimating the term…
A retainer for a rolling bearing, which is used for a food machine or a vacuum apparatus, containing an increased amount of a lubricating oil and enhancing a use efficiency of the lubricating oil and rolling bearing is described. The retainer consists of a molding, of a synthetic resin composition, which holds a rolling element of a rolling bearing. The molding is composed of a resinous porous article having an interconnected hole porosity not less than 30% and a lubricating oil which impregnates the resinous porous article. The resinous porous article has an interconnected hole are formed by molding a resin containing a pore-forming substance having a melting point higher than that of the resin and can be used as a food material, and by extracting said pore-forming substance from the molding with a solvent which dissolves the pore-forming substance and does not dissolve the resin.
A rolling bearing retainer comprising a molding, of a synthetic resin composition, which holds a rolling element of a rolling bearing, wherein said molding comprises a resinous porous article having an interconnected hole porosity not less than 30% and a lubricating oil which impregnates said resinous porous article, wherein said resinous porous article is formed by molding a resin containing a pore-forming substance incorporated therein wherein said pore forming substance is a rust preventative agent, and by extracting a portion of said pore-forming substance from said molding with a solvent which dissolves said pore-forming substance and does not dissolve said resin, wherein said pore-forming substance is a weak alkali substance, wherein an unextracted portion of said pore-forming substance is capable of functioning as a rust preventative agent is retained in said porous article.
Dependencies are inferred from the claim text.