Patent ID: 6296391
Filing Date: 2001-10-02
Classification: F16C,G11B

Abstract:
A hydrodynamic bearing apparatus comprising:two hydrodynamic bearing sections which have a shaft member;a bearing member fit to said shaft member with a predetermined space therein; andlubricants filling said space between said shaft member and said bearing member;and which are separately placed in the axial direction of said shaft member; wherein:said lubricants of said two hydrodynamic bearing sections are separated from each other by an air layer;said lubricants are pressured by hydrodynamic generating grooves formed on said hydrodynamic bearing sections such that said shaft member and said bearing member are rotatably supported in relation to each other;said hydrodynamic generating grooves separately formed on said two hydrodynamic bearing sections are formed into an unbalanced shape such that said lubricants are moved in a predetermined direction to correct the slope of said shaft member and said bearing member when rotation is suspended;capillary sealing sections having slanted surfaces with the same radius of curvature are formed in continuation to end sections of each of said two hydrodynamic bearing sections to sustain said lubricants by capillarity; and the maximum amount of said lubricant in one of said capillary sealing sections, which is located downstream in the moving direction of said lubricants, is established to be larger than the moving amount of said lubricants.