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Hydrodynamic bearing device and inspection method of amount of working fluid

A fluid bearing and working fluid technology, applied in bearings, electromechanical devices, bearing components, etc., can solve problems such as unstable rotation, decreased bearing rigidity, and reduced delivery volume, and achieve the effects of improving reliability and preventing fluid bearing devices

Inactive Publication Date: 2006-06-21
PANASONIC CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In this way, once the air becomes air bubbles and mixes inside and adheres to the dynamic pressure grooves 56 of the radial fluid bearing and the dynamic pressure grooves 57, 58 of the thrust fluid bearing, the delivery volume of the working fluid will be reduced by the dynamic pressure grooves 56, 57, 58. If it is small, there will be problems such as the reduction of bearing rigidity due to air bubbles, and the rotation instability during rotation.

Method used

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  • Hydrodynamic bearing device and inspection method of amount of working fluid
  • Hydrodynamic bearing device and inspection method of amount of working fluid
  • Hydrodynamic bearing device and inspection method of amount of working fluid

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Embodiment Construction

[0041] Hereinafter, a fluid bearing device and a method for inspecting the amount of working fluid thereof according to an embodiment of the present invention will be described with reference to the drawings. In this embodiment, a case where the fluid bearing device is used in a spindle motor of a hard disk drive will be described.

[0042] Implementation form 1:

[0043] figure 1 is a cross-sectional view of a spindle motor having a fluid bearing device according to an embodiment of the present invention, Figure 2A is a sectional view of the fluid bearing device, image 3 is a top view of the fluid bearing device, Figure 2A yes image 3 The II-II line sectional view. In the following description, for easy understanding, such as figure 1 As shown in FIG. 2 , the case where the open end of the bearing hole of the bushing is arranged above and the closed end is arranged below is described, but it is of course not limited to such an arrangement in actual use.

[0044] ...

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Abstract

The present invention provides a fluid bearing device and a method for inspecting the amount of working fluid. In a fluid bearing device with a cover plate (5) covering a shaft sleeve (2), it can be easily confirmed that the working fluid is well filled in the cover plate and the shaft sleeve. between them, and it can be easily confirmed that the adhesive bonding the cover plate and the bushing is well filled. A translucent material is used as the cover plate, and the filling state of the working fluid can be easily confirmed visually or by an imaging member through the cover plate.

Description

(1) Technical field [0001] The present invention relates to a fluid bearing device used in a spindle motor for rotationally driving a magnetic disk, an optical disk, etc., and a method for inspecting the amount of working fluid filled in the fluid bearing device. (2) Background technology [0002] As a bearing device used in a spindle motor of a hard disk device, fluid bearing devices that have higher rotation accuracy than ball bearings and are also superior in quietness are increasingly being used instead of conventional ball bearings. [0003] As such a fluid bearing device, for example, there is a fluid bearing device disclosed in Japanese Patent Application Laid-Open No. 11-82486. like Figure 17 As shown, the fluid bearing device includes: a rotating shaft 51; a sleeve 52 arranged on the outer periphery with a gap with respect to the rotating shaft 51; The large-diameter thrust flanges 53, 54 are arranged with a gap, and the working fluid composed of lubricating oil i...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F16C17/10F16C33/10F16C33/14H02K7/08
CPCF16C17/107F16C33/103F16C33/107F16C2370/12F16C33/726F16C33/745F16C17/243
Inventor 上之园薰吉川洋生
Owner PANASONIC CORP
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