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Dynamic pressure bearing device

A fluid dynamic pressure bearing and bearing technology, which is applied in the direction of sliding contact bearings, bearings, rotating bearings, etc., can solve problems such as flow interference of lubricating fluid 120, and achieve the effect of reducing vibration and noise

Active Publication Date: 2008-09-24
NIDEC CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Therefore, the flow of lubricating fluid 120 is disturbed

Method used

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  • Dynamic pressure bearing device
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Examples

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Embodiment Construction

[0030] figure 1 A hard disk drive spindle motor using a fluid dynamic pressure bearing device, which is a configuration of an example of a fluid dynamic pressure bearing device related to the present invention, is shown in . figure 1 is a view of the section in the direction of the axis of rotation.

[0031] will refer to figure 1 Gives an overall description of the spindle motor used to drive the hard disk.

[0032] The bearing sleeve 1 is in the shape of a hollow cylinder, and the cylindrical housing 2 with the bottom is fixed on the outer circumference of the bearing sleeve 1 by, for example, joining or bonding that can directly connect the spindle motor to the hard disk drive with screws or the like. the underside of the surface. A shaft 3 as a rotating shaft is inserted into the bearing sleeve 1 with a slight gap 4 interposed between the shaft 3 and the bearing sleeve 1 on the inner peripheral surface of the bearing sleeve 1 . Lubricating fluid 5 such as oil or mag...

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Abstract

In a wider flow path 4 a surrounded with a shaft 3 , a thrust plate 6 and an inner circumferential corner portion 1 c of a bearing sleeve 1 in a small clearance 4 between a lower side radial bearing section 13 and an upper surface thrust bearing section 14 , chamfering is performed at the inner circumferential corner portion 1 c of the bearing sleeve 1 , wherein a width of the wider flow path 4 a in the radial direction in rotation is formed so as to be wider than a width of a communication hole 16 located below the wider flow path 4 a in the radial direction in rotation to thereby render a flow of a lubricating fluid 5 flowing into the wider flow path 4 a from the communication hole 16 smooth.

Description

technical field [0001] The present invention relates to a fluid dynamic pressure bearing device in which a bearing member and a shaft member are suspended so as to be relatively rotatable by dynamic pressure generated in a lubricating fluid. Background technique [0002] In recent years, various dynamic pressure bearing devices have been proposed for supporting various rotating bodies such as magnetic disks, polygon mirrors, and optical disks rotating at high speed. For example in Figure 13 , shows a dynamic pressure bearing device mounted on a spindle motor for a hard disk drive device. Figure 13 The middle solid arrow mark indicates the direction of action of the pressure in the lubricating fluid in the bearing part. [0003] Such as Figure 13 As shown, the dynamic pressure bearing device is configured such that a rotating shaft 110 is inserted into a bearing sleeve 100 in a freely rotatable manner. A lubricating fluid 120 such as oil is injected into a minute gap betw...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): F16C33/10F16C17/10
Inventor 安藤博典竹村健太郎三上寿人
Owner NIDEC CORP