Fluid bearing device

A technology of fluid bearings and bearing sleeves, applied in bearings, electromechanical devices, bearing components, etc., can solve problems such as high production prices of metal products, damage to surrounding equipment, and static electricity cannot be eliminated, so as to maintain good fluidity, reduce labor, and improve The effect of job stability

Active Publication Date: 2006-04-26
NTN CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the high production cost of turned metal products hinders people's desire to reduce the cost of bearings
[0006] In addition, in the fluid bearing of the above-mentioned structure, since the shaft member and the housing are isolated by lubricating oil during rotation, static electricity generated by friction between a rotating body such as a magnetic disk and the surrounding air cannot be eliminated, and it is easy to cause The charge of the rotating body
If the above-mentioned electrification phenomenon is ignored, there is a danger of some problems including the generation of a potential difference between the magnetic disk and the magnetic head or the damage of surrounding equipment caused by the discharge of this static electricity.

Method used

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Examples

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Embodiment Construction

[0074] Below, according to Figure 1-3 Preferred embodiments of the present invention will be described.

[0075] image 3 A possible structure of a spindle motor for an information processing device incorporating the fluid bearing device 1 according to this embodiment is shown. This spindle motor is used in a disk drive device for HDD or the like, and includes: a fluid bearing device 1 that supports a shaft member 2 in a freely rotatable, non-contact manner; and is attached to the shaft member 2 by press fitting or the like The upper hub 3; and the motor stator 4 and the motor rotor 5, the stator and the rotor are formed to face each other through a gap in the radial direction. The stator 4 is connected to the outer peripheral edge of the casing 6 , and the rotor 5 is connected to the inner peripheral edge of the disk hub 3 . A casing 7 for a fluid bearing device is attached to the inner peripheral edge of the housing 6 . One or more disks D such as magnetic disks are sup...

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Abstract

The invention relates to a fluid bearing device, which can realize cost reduction and prevent itself from being charged by static electricity. A bearing sleeve is provided inside the housing, and the shaft member is inserted into the bearing sleeve. A pressure is generated in a bearing gap between the inner surface of the bearing housing and the outer peripheral surface of the shaft member by the dynamic pressure of the lubricating oil to radially support the shaft member in a non-contact state with the bearing housing. The shaft end of the shaft member is in contact with the bottom of the case, which is formed of a conductive resin compound mixed with carbon nanofibers, and whose volume resistivity is set to be 106 Ω·cm or less to conduct electricity.

Description

technical field [0001] The present invention relates to a fluid bearing device which supports a rotating part in a non-contact manner via a lubricating oil film formed within a radial bearing gap; the invention also relates to a dynamic bearing device (hydrodynamic bearing device) which The device supports rotating parts in a non-contact manner by means of the dynamic pressure effect of lubricating oil generated within the bearing gap. These bearing units are suitable for use in information processing equipment including: spindle motors for magnetic disk devices such as HDD and FDD; spindle motors for optical disk devices such as CD-ROM, CD-R / RW, DVD-ROM / RAM; and Spindle motors used in magneto-optical disc devices such as MD and MO; polygon scanner motors used in laser printers (LBP); or small motors used in electrical equipment such as axial fans. Background technique [0002] In each of the above motors, in addition to high rotational accuracy, other desirable performance...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F16C17/10B29C45/38F16C17/02F16C17/04F16C17/26F16C33/10F16C35/02H02K5/16H02K7/08H02K11/00
CPCF16C17/107F16C17/26F16C33/107F16C2370/12H02K5/1675H02K11/00H02K11/40B29C45/38F16C17/10F16C35/02H02K7/08
Inventor 里路文规伊藤健二柴原克夫
Owner NTN CORP
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