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Generators or Motors

Liquid-dynamic-pressure-bearing-and-spindle-motor-hard-disk-driving-unit-and-scanner-motor-using-the-bearing

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Liquid dynamic pressure bearing and spindle motor, hard-disk driving unit, and scanner motor using the bearing

Details

Inventors: Iwaki, Tadao;
Assignee: Seiko Instruments Inc. (JP)
Primary Examiner: Letscher; George J.
Assistant Examiner:
Attorney, Agent or Firm: Adams & Wilks

A liquid dynamic pressure bearing has bearing portions provided at opposite ends of a rotor shaft. The bearing portions are spaced from the rotor shaft by a gap having only one opening portion to maintain lubrication oil therein. A capillary oil sealing portion is formed at the opening portion to prevent evaporation and leakage of oil. Inside the bearing portions, journal bearings are formed at the central axis of the rotor shaft to prevent precession of the rotor shaft. A driving mechanism for driving the rotor shaft and a load are formed between the bearing portions to provide a stable spindle motor resistant to external vibration.

DETAILED DESCRIPTION To achieve the above-object, a liquid dynamic pressure bearing in a first aspect of the present invention has the characteristics that it is a liquid dynamic pressure bearing for supporting a rotor shaft; it has a pair of liquid dynamic pressure bearings for supporting both ends of the rotor shaft; the pair of liquid dynamic pressure bearings keep the predetermined liquid for lubrication in a clearance having only one opening portion; and a journal bearing is formed in a common axis at least at one side of one of the liquid dynamic pressure bearings.
The pair of liquid dynamic pressure bearings may be conical in shape at a bearing face thereof in a second aspect.
The pair of liquid dynamic pressure bearings may be disk shape at a bearing face thereof in a third aspect.
A capillary oil-sealing portion may be formed at the opening portion in a fourth aspect.
A liquid receiver for receiving liquid between an edge end of the journal bearing and the facing rotor shaft is provided in a fifth aspect.
A spindle motor supporting the rotor by liquid dynamic pressure bearing of the present invention is characterized by the following characteristics: the spindle motor has a pair of liquid dynamic pressure bearing portions with which the liquid dynamic pressure bearings support both ends of the rotor shaft; the pair of liquid dynamic pressure bearing portions keep the predetermined liquid for lubrication with clearance having only one opening portion; and a journal bearing is formed in common axis at least at one side at the one liquid dynamic pressure bearing portion in a sixth aspect.
The pair of liquid dynamic pressure bearing portions may be conical in shape at the bearing face thereof in a seventh aspect.
The pair of liquid dynamic pressure bearing portions may be disk shaped at the bearing face thereof in an eighth aspect.
A capillary oil-sealing portion may be formed at the opening portion in a ninth aspect.
A liquid receiver for receiving the liquid between an edge end of the journal bearing and the facing rotor shaft is provided in a tenth aspect

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