发明名称 |
Dynamic pressure bearing, spindle motor using dynamic pressure bearing, and rotary device having the spindle motor as driving source |
摘要 |
A spindle motor has a rotor, a stator and a dynamic pressure bearing for supporting the rotor for rotation relative to the stator. The dynamic pressure bearing comprises a rotational shaft mounted for undergoing rotation and having a thrust bearing portion and a radial bearing portion. A bearing member rotatably supports the rotational shaft and has a closed end forming a small diameter cylinder portion for receiving the radial bearing portion of the rotational shaft and an open end forming a large diameter cylinder portion for receiving the thrust bearing portion of the rotational shaft such that first gaps for receiving a lubricating oil are formed between the rotational shaft and the bearing member. A thrust pressure member is connected to the bearing member to form a capillary seal between the rotational shaft and the open end of the bearing member and to form second gaps between the thrust pressure member and the rotational shaft for receiving a lubricating oil. An oil receiving groove is formed in at least one of the thrust pressure member and the rotational shaft for receiving a lubricating oil.
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申请公布号 |
US6176618(B1) |
申请公布日期 |
2001.01.23 |
申请号 |
US19980215723 |
申请日期 |
1998.12.18 |
申请人 |
SEIKO INSTRUMENTS INC. |
发明人 |
KAWAWADA NAOKI;TAKEHARA ISAMU |
分类号 |
F16C17/04;F16C33/10;G11B19/20;H02K7/08;(IPC1-7):F16C32/06 |
主分类号 |
F16C17/04 |
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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