| 摘要 |
PROBLEM TO BE SOLVED: To provide an oil-impregnated bearing oil which is lowly viscous, lowly evaporable, and heat-resistant, does not emit lowly volatile components and outgases when used in a motor, and can prevent the friction of an oil-impregnated bearing even in a motor having a special structure in which pressure is applied in a specified direction; an oil-impregnated bearing using the oil; and a pressurization motor. SOLUTION: The oil-impregnated bearing oil is prepared by adding a phenolic antioxidant or an amine antioxidant and a friction modifier comprising at least one member selected from among an orthophosphoric ester, an acidic phosphoric ester, and an amine salt of an acidic phosphoric ester to a low-viscosity ester base oil. There are also provided the oil-impregnated bearing impregnated with the oil, and the pressurization motor wherein a means for applying a specifically directed side thrust to a motor shaft supported by an oil-impregnated bearing prepared by pressure-sintering a metal powder is obtained by displacing one side core of cores fixed symmetrically around the motor shaft to the direction of the motor shaft and wherein the oil-impregnated bearing is impregnated with the oil-impregnated bearing oil. COPYRIGHT: (C)2009,JPO&INPIT
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