发明名称 |
Magnetic disk apparatus, including spindle motor having air flow passage in hub for pressure balance |
摘要 |
In a magnetic disk apparatus, the spindle motor is provided with a hole that penetrates the hub in the axial direction thereof. The hole permits fluid pressure on the outside and inside of the hub to become balanced, reducing the axial fluid force caused by the rotation of the spindle motor. The apparatus further includes a bearing provided with a groove for dynamic pressure generation and a magnetic lubrication fluid which, in combination with a permanent magnet, prevents oil leakage and scattering.
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申请公布号 |
US6356408(B1) |
申请公布日期 |
2002.03.12 |
申请号 |
US19990388439 |
申请日期 |
1999.09.02 |
申请人 |
HITACHI, LTD. |
发明人 |
NII KATSUTOSHI;MURANISHI MASARU;TOMIDA KENJI;UEFUNE KOUKI;SAEGUSA SHOZO;YANAGASE YUUICHI |
分类号 |
F16C17/10;F16C33/10;G11B5/02;G11B19/20;G11B25/04;G11B33/14;H02K5/16;(IPC1-7):G11B17/02;H02K7/00;H02K5/167 |
主分类号 |
F16C17/10 |
代理机构 |
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代理人 |
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主权项 |
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地址 |
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