发明授权
US08284515B2 Fluid dynamic pressure bearing device, spindle motor and disk drive apparatus
有权
流体动压轴承装置，主轴电机和磁盘驱动装置
- 专利标题： Fluid dynamic pressure bearing device, spindle motor and disk drive apparatus
- 专利标题（中）： 流体动压轴承装置，主轴电机和磁盘驱动装置
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申请号： US13197820申请日： 2011-08-04
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公开(公告)号： US08284515B2公开(公告)日： 2012-10-09
- 发明人: Yoichi Sekii , Hironao Sasaki , Takuro Iguchi , Hironori Ando , Toshihiro Akiyama , Takunori Shinao , Yuichi Shigematsu , Yasutaka Ino , Tatsuyoshi Nakatani
- 申请人： Yoichi Sekii , Hironao Sasaki , Takuro Iguchi , Hironori Ando , Toshihiro Akiyama , Takunori Shinao , Yuichi Shigematsu , Yasutaka Ino , Tatsuyoshi Nakatani
- 申请人地址： JP Kyoto
- 专利权人： Nidec Corporation
- 当前专利权人： Nidec Corporation
- 当前专利权人地址： JP Kyoto
- 代理机构： Keating & Bennett, LLP
- 优先权： JP2008-060769 20080311; JP2009-105583 20090423; JP2009-290163 20091222; JP2010-287815 20101224
- 主分类号： G11B17/08
- IPC分类号： G11B17/08
摘要：
A fluid dynamic bearing mechanism includes a stationary shaft, a sleeve portion arranged to rotate with respect to the shaft, and a thrust portion including an upper end surface arranged oppose to a lower end surface of the sleeve portion. An inside surface of the thrust portion includes an inside surface contact portion arranged in contact with an outside surface of the shaft, and an inside surface lower non-contact portion spaced away from the outside surface of the shaft, and arranged to extend downward from a lower end of the inside surface contact portion. An outside surface of the thrust portion includes an outside surface inclined portion arranged in contact with an interface of a lubricating oil. The lower end of the inside surface contact portion is arranged at a level axially higher than that of a lower end of the outside surface inclined portion.