Patent Number: 6,296,391

Title: Hydrodynamic bearing apparatus

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

Inventors: Hayakawa; Masamichi (Nagano, JP), Gomyo; Masato (Nagano, JP), Kanebako; Hideki (Nagano, JP), Miura; Kazushi (Nagano, JP)

Assignee: Sankyo Seiki Mfg. Co., Ltd.

International Classification: F16C 33/04 (20060101); F16C 33/10 (20060101); G11B 19/20 (20060101); F16C 032/06 ()

Expiration Date: 10/02/2018