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Hydrodynamic bearing assembly and spindle motor having the same

a technology of hydrodynamic bearings and spindles, applied in the direction of sliding contact bearings, instruments, record information storage, etc., can solve the problems of bubbles not being discharged outwardly from the bearing clearance, fluid may not circulate, etc., and achieve the effect of reducing the occurrence of phenomena

Inactive Publication Date: 2014-06-26
SAMSUNG ELECTRO MECHANICS CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

The invention is about a bearing that helps reduce problems during initial rotation when lubricating fluid doesn't circulate. This invention is useful for spindle motors.

Problems solved by technology

However, lubricating fluid may not circulate, and that is, may not move due to process tolerance or assembly tolerance of a sleeve or shaft.
Thus, bubbles may not be discharged outwardly from a bearing clearance.

Method used

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  • Hydrodynamic bearing assembly and spindle motor having the same
  • Hydrodynamic bearing assembly and spindle motor having the same
  • Hydrodynamic bearing assembly and spindle motor having the same

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Embodiment Construction

[0026]Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings. The invention may, however, be embodied in many different forms and should not be construed as being limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the invention to those skilled in the art.

[0027]FIG. 1 is a schematic cross-sectional view of a spindle motor 100 including a hydrodynamic bearing assembly 200 according to an embodiment of the present invention, FIG. 2 is an enlarged diagram of portion A of FIG. 1, FIG. 3 is a partially exploded perspective view of a sleeve 130 included in the spindle motor 100 including the hydrodynamic bearing assembly 200 according to an embodiment of the present invention, and FIG. 4 is a diagram for explaining a flow path of lubricating fluid in a bearing clearance formed in the hydrodynamic beari...

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Abstract

There is provided a hydrodynamic bearing assembly including a sleeve; and a shaft rotatably inserted into a shaft hole and constituting a bearing clearance, wherein at least one of an inner circumferential surface of the sleeve and an outer circumferential surface of the shaft includes upper and lower radial dynamic pressure grooves having a herringbone pattern, and conditional expressions a+b>c+d and b−a>c−d>0 are satisfied.

Description

CROSS-REFERENCE TO RELATED APPLICATIONS[0001]This application claims the priority of Korean Patent Application No. 10-2012-0153004 filed on Dec. 26, 2012, in the Korean Intellectual Property Office, the disclosure of which is incorporated herein by reference.BACKGROUND OF THE INVENTION[0002]1. Field of the Invention[0003]The present invention relates to a hydrodynamic bearing assembly and a spindle motor having the same.[0004]2. Description of the Related Art[0005]In general, a small spindle motor used in a recording disk driving device (e.g., a hard disk drive (HDD)) includes a hydrodynamic bearing assembly. A lubricating fluid such as oil is filled in a bearing clearance of the hydrodynamic bearing assembly. The oil filled in the bearing clearance is pumped by a dynamic pressure groove to form hydrodynamic pressure to rotatably support a shaft.[0006]During rotation and driving of a rotor, bubbles can be formed in the lubricating fluid filled in the bearing clearance. A circulation...

Claims

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Application Information

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Patent Type & Authority Applications(United States)
IPC IPC(8): F16C17/10H02K7/08
CPCF16C17/107F16C17/24F16C33/107F16C33/1085F16C2240/40F16C2370/12F16C17/10F16C33/10G11B19/20H02K5/173F16C17/102H02K7/08
Inventor SODEOKA, SATORU
Owner SAMSUNG ELECTRO MECHANICS CO LTD