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| Submersible pump |
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Hydraulic dynamic bearing and spindle motor utilizing hydraulic dynamic bearing
| Details |
Inventors: Iwaki, Tadao; Ohki, Shigeru; Kawawada, Naoki; Ohta, Atsushi; Nitadori, Koji; Takehara, Isamu; Goto, Hiromitsu; Suzuki, Takafumi;
Assignee: Seiko Instruments Inc. (JP)
Primary Examiner: Mullins; Burton
Assistant Examiner:
Attorney, Agent or Firm: Adams & Wilks
A hydraulic dynamic bearing has a rotational assembly and a bearing member for rotationally supporting the rotational assembly. The bearing member has a main body having a recess portion and a cover for covering an open end of the recess portion. The rotational assembly has a shaft main body having an end portion extending into the recess of the bearing main body for undergoing rotation relative thereto and a ring member disposed in the recess of the bearing main body. The ring member is connected to the end portion of the shaft main body for rotation therewith. Axial dynamic pressure generating grooves are formed in upper and lower surface portions of the ring member for generating axial dynamic pressure during rotation of the rotational assembly. Radial dynamic pressure generating grooves are formed in an outer peripheral surface portion of the ring member for generating radial dynamic pressure during rotation of the rotational assembly. Spaces are formed between the bearing member and the rotational assembly for storing a lubricant. |
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DETAILED DESCRIPTION Hence, it is an object of the invention to provide a hydraulic dynamic bearing capable of resolving the above-described problem in the conventional technology and to a spindle motor using the hydraulic dynamic bearing.
In order to resolve the above-described problem, according to an aspect of the invention, there is proposed a hydraulic dynamic bearing which is a ring-like hydraulic dynamic bearing comprising a shaft portion constituted by fixing a ring to an end portion of a shaft main body thereof and a bearing portion supporting the shaft portion via the ring wherein a radial dynamic pressure bearing portion and axial dynamic pressure bearing portions are formed contiguously to each other between the ring and the bearing portion and wherein spaces for storing a lubricant for generating dynamic pressure are provided along portions of the radial dynamic pressure bearing portion and the axial dynamic pressure bearing portions contiguous to each other.
When relative rotational motion is caused between the shaft portion and the bearing portion, the lubricant at the respective dynamic pressure bearing portions is drawn to respective central portions of the shaft and bearing portions to thereby generate required dynamic pressure.
Therefore, at regions of the radial dynamic pressure bearing portion and the axial dynamic pressure bearing portions contiguous to each other, the lubricant is going to reduce.
However, owing to the lubricant stored in the spaces provided along the portions of the two dynamic pressure bearing portions contiguous to each other, the reduction does not amount to produce mutual interference between the two dynamic pressure bearing portions and mutual operation between the two dynamic pressure bearing portions is alleviated.
As a result, at the portions of the two dynamic pressure bearing portions contiguous to each other, generation of negative pressure is restrained and air bubbles can be restrained from generating in the lubricant and accordingly, the bearing rigidity can be made higher than that in the conventional bearing
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