Invention Grant
US08922943B2 Fluid dynamic bearing apparatus, spindle motor, and disk drive apparatus
有权
流体动力轴承装置，主轴电机和磁盘驱动装置
- Patent Title: Fluid dynamic bearing apparatus, spindle motor, and disk drive apparatus
- Patent Title (中): 流体动力轴承装置，主轴电机和磁盘驱动装置
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Application No.: US13299542Application Date: 2011-11-18
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Publication No.: US08922943B2Publication Date: 2014-12-30
- Inventor: Hiroki Yamada , Junya Mizukami , Tsuyoshi Morita , Tetsuya Maruyama , Takuro Iguchi
- Applicant: Hiroki Yamada , Junya Mizukami , Tsuyoshi Morita , Tetsuya Maruyama , Takuro Iguchi
- Applicant Address: JP Kyoto
- Assignee: Nidec Corporation
- Current Assignee: Nidec Corporation
- Current Assignee Address: JP Kyoto
- Agency: Keating & Bennett, LLP
- Priority: JP2008-136648 20080526; JP2009-115505 20090512; JP2011-065368 20110524
- Main IPC: G11B17/02
- IPC: G11B17/02 ; H02K5/167 ; F16C17/10 ; F16C33/10 ; G11B19/20 ; F16C33/74
Abstract:
In a fluid dynamic bearing apparatus, an oil buffer is defined between a thrust gap and a pumping gap. The oil buffer has an axial dimension greater than that of the thrust gap, and/or has a radial dimension greater than that of the pumping gap. An air bubble generated in the thrust gap due to cavitation, for example, when a fluid dynamic bearing apparatus experiences a vibration can be dissolved in lubricating oil provided within the oil buffer. This prevents leakage of the lubricating oil due to the air bubble residing in the fluid dynamic bearing apparatus.
Public/Granted literature
- US20120063030A1 FLUID DYNAMIC BEARING APPARATUS, SPINDLE MOTOR, AND DISK DRIVE APPARATUS Public/Granted day:2012-03-15
Information query
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