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Fluid bearing device

A technology of fluid bearings and bearings, applied in bearings, bearing components, shafts and bearings, etc., can solve the problems of dimensional tolerance, production efficiency reduction, high cost, etc., and achieve the effect of high bearing performance

Inactive Publication Date: 2009-04-01
NTN CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, it is not easy to carry out the assembly with high precision, which may lead to high cost due to the reduction of production efficiency.
In particular, as described in the structures described in the aforementioned Patent Documents 2 and 3, in the case of using a plurality of bearing sleeves, in addition to the assembly accuracy of the bearing sleeves to the housing, the positional accuracy between the bearing sleeves (coaxial degree, etc.) is also a problem, but there are dimensional tolerances on the housing and the bearing sleeve, so it is becoming increasingly difficult to assemble these, which may lead to further cost increase

Method used

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Examples

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Embodiment Construction

[0046] Hereinafter, embodiments of the present invention will be described based on the drawings.

[0047] figure 1 A structural example of a spindle motor for equipment information embedded in a fluid bearing device is conceptually shown. This spindle motor for equipment information is used in a disk drive device such as an HDD, and includes: a fluid bearing device 1; a rotor (disk hub) 3 attached to a shaft member 2 of the fluid bearing device 1; Stator coil 4 and rotor magnet 5; and bracket 6. The stator coil 4 is attached to the outer periphery of the bracket 6 , and the rotor magnet 5 is attached to the inner periphery of the hub 3 . The hub 3 holds a disk D such as one or more magnetic disks on its outer periphery. When the stator coil 4 is energized, the rotor magnet 5 is rotated by the electromagnetic force generated between the stator coil 4 and the rotor magnet 5 , and accordingly, the disk hub 3 and the shaft member 2 are integrally rotated.

[0048] figure 2 ...

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Abstract

A fluid dynamic bearing device capable of exercising high bearing performance is provided at low cost. A housing 7 is injection molded with a bearing sleeve 8 as an insert. Accordingly, the molding of the housing 7 and the assembly of the housing 7 and the bearing sleeve 8 can be performed in a single step. In addition to this, by simply increasing the die precisions the housing 7 and the bearing sleeve 8 can be fixed easily with high precision. Since the housing 7 is opened at both ends, it is possible to sandwich the bearing sleeve 8, and accordingly, the bearing sleeve 8 can be accurately positioned inside the dies with reliability.

Description

technical field [0001] The present invention relates to hydrodynamic bearing devices. Background technique [0002] The fluid bearing device is a bearing device that relatively rotatably supports a shaft that needs to be supported by a lubricating film of a fluid generated in a bearing gap. The fluid bearing device has the characteristics of high-speed rotation, high rotation precision, low noise and the like. In recent years, its characteristics have been applied and used as information equipment, such as magnetic disk devices such as HDD and FDD, optical disk devices such as CD-ROM, CD-R / RW, DVD-ROM / RAM, and optical disk devices such as MD and MO. Bearings for mounted spindle motors or fan motors mounted on personal computers (PCs) to cool heat sources are widely used. [0003] For example, a fluid bearing device embedded in a spindle motor for HDD is provided with a radial bearing portion supporting the shaft member in the radial direction and a thrust bearing portion s...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F16C35/02F16C33/10F16C17/10
Inventor 伊藤健二稻塚贵开古森功堀政治户田正明
Owner NTN CORP
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