LUBRICATING OIL COMPOSITION, DYNAMIC PRESSURE FLUID BEARING AND MOTOR

摘要

PROBLEM TO BE SOLVED: To provide a stable lubricating oil for a dynamic pressure fluid bearing which has a low viscosity even at low temperatures, simultaneously reduces viscosity change and vaporization loss and, in addition, is hard to cause oxidation and decomposition up to high temperatures, a dynamic pressure fluid bearing using the same, and a motor.;SOLUTION: The lubricating oil is constituted of a base oil of the ester type to be represented by structure (1) (wherein R is a linear saturated alkyl group to be represented by C₈H₁₇) which is composed of a polyol and a fatty acid and a mixed antioxidant composed of a hindered phenolic antioxidant having at least one 3,5-di-tert-butyl-4-hydroxyphenyl and a hindered amine based antioxidant.;COPYRIGHT: (C)2003,JPO