Fluid dynamic pressure bearing lubricant oil composition, fluid dynamic pressure bearing, and fluid dynamic pressure bearing apparatus
AssigneesNtn Corporation, Nok Klueber Co., Ltd.
InventorsShinji KOMATSUBARA, Dai OSANAI
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Abstract
A lubricating-oil composition for a fluid-dynamic bearing, which is to be used for a fluid-dynamic bearing (8) including radial dynamic pressure generating portions (A1, A2) provided on an inner peripheral surface (Sa) of a porous body, has the following makeup. That is, a base oil having a kinematic viscosity of more than 30 mm2/s and 80 mm2/s or less at a temperature of 40° C. is used as a base oil of the lubricating-oil composition, and the makeup of the lubricating-oil composition is adjusted so that the lubricating-oil composition has a kinematic viscosity of 90 mm2/s or more and 140 mm2/s or less at a temperature of 40° C.
Claims10
A lubricating-oil composition for a fluid-dynamic bearing, the lubricating-oil composition being configured to be used for the fluid-dynamic bearing, which is formed of a porous body having inner pores, and comprises a radial dynamic pressure generating portion on an inner peripheral surface of the porous body,
- wherein a base oil having a kinematic viscosity of more than 30 mm2/s and 80 mm2/s or less at a temperature of 40° C. is used as a base oil, and
- wherein the lubricating-oil composition has a kinematic viscosity of 90 mm2/s or more and 140 mm2/s or less at a temperature of 40° C.
Dependencies are inferred from the claim text.