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Hydrodynamic bearing device

A fluid bearing, radial bearing technology, applied in the direction of bearings, bearing elements, shafts and bearings, etc.

Inactive Publication Date: 2011-02-16
NTN CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, since the core is covered with a resin portion, even if the core is positioned with high precision, the accuracy of the hub end surface may be reduced due to molding shrinkage of the resin, and the desired thrust bearing gap width accuracy may not be obtained.

Method used

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Embodiment Construction

[0110] Hereinafter, a first embodiment of the present invention will be described with reference to the drawings.

[0111] figure 1 A configuration example of a spindle motor for information equipment incorporating the fluid bearing device 1 to which the present invention is applied is schematically shown. This spindle motor is used in a disk drive device such as an HDD, and includes a fluid bearing device (dynamic pressure bearing device) 1 that relatively rotatably supports a shaft member 2 in a non-contact manner, a stator coil 4 and a rotor that face each other at intervals in the radial direction, for example. Magnet 5 and bracket 6. The stator coil 4 is mounted on the inner peripheral surface on the outer peripheral side of the bracket 6 , and the rotor magnet 5 is fixed on the outer diameter side of the hub 10 via the yoke 12 . The fluid bearing device 1 is fixed to the inner periphery of the bracket 6 . In addition, the hub 10 (not shown in the figure) holds one or...

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PUM

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Abstract

The present invention provides a hydrodynamic bearing device, a hub (10) is formed by injection-molding a resin with a core metal (13) inserted, and the core metal (13) is exposed from the surface of the hub (10). Thus, since the cavity of a metal molding die for molding the hub (10) is not divided by the core metal (13), deterioration of fluidity of the resin due to arrangement of the core metal(13) in the cavity can be suppressed.

Description

technical field [0001] The present invention relates to a fluid bearing device that rotatably supports a shaft member by utilizing a lubricating film formed in a radial bearing gap. Background technique [0002] This fluid bearing device can be used as a spindle motor for information equipment, such as disk drive devices such as HDD, optical disk devices such as CD-ROM, CD-R / RW, DVD-ROM / RAM, and optical disk drives such as MD and MO. It is suitable for multi-angle scanner motors of laser printers (LBP), color wheel motors of projectors, or small motors such as fan motors for electrical equipment. [0003] For example, Patent Document 1's Figure 5 2 exemplifies a fluid bearing device including a shaft member and a resin hub (disc hub) protruding from the shaft member in the outer diameter direction, and a core (metal part) is embedded in the hub. In this way, since the resin hub has a core, the strength of the hub increases, and deformation of the hub due to clamping force ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): F16C17/10F16C33/10
Inventor 稻塚贵开平出淳栗村哲弥古森功尾藤仁彦
Owner NTN CORP