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Fluid dynamic pressure bearing, and spindle motor and recording disc drive unit comprising the same

A technology for hydrodynamic bearings and spindle motors, applied in bearing elements, sliding contact bearings, bearings in rotary motion, etc., can solve problems such as long processing time, and achieve the effect of reducing manufacturing steps, improving mass production, and reducing materials

Inactive Publication Date: 2007-07-18
MINEBEA CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Also, the machining time required for precision machining processes is a problem for mass production
Especially the manufacture of the cup-shaped housing 06 requires a long machining time
[0013] Moreover, the adhesive fastening between the outer circumferential side of the upper end of the sleeve 05 and the upper end of the housing 06 ( FIG. 10 , FIG. 11 ) and the glue between the sealing cover plate 09 and the upper end of the cup-shaped housing 06 Adhesive fastening (Figure 11) also has problems

Method used

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  • Fluid dynamic pressure bearing, and spindle motor and recording disc drive unit comprising the same
  • Fluid dynamic pressure bearing, and spindle motor and recording disc drive unit comprising the same
  • Fluid dynamic pressure bearing, and spindle motor and recording disc drive unit comprising the same

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0038] Fig. 1 is a schematic vertical sectional view of a hydrodynamic pressure bearing of a first embodiment. The hydrodynamic pressure bearing 1 supports free rotation of a rotary shaft 2 having a flange portion 4 . This free rotation is supported via a radial microgap formed between the shaft 2 and the sleeve 5 . The sleeve 5 has radial dynamic pressure generating grooves 11 on the inner circumference. The flange portion 4 is inserted and held so as to be sandwiched between the lower end surface 5 a of the sleeve 5 where the axial dynamic pressure generating groove 12 is formed and the upper surface 7 a of the end plate 7 where the axial dynamic pressure generating groove 13 is formed. The lower end surface 5a and the upper surface 4a and the upper surface 7a and the lower surface 4b are opposed to each other via axial micro-gap. The radial dynamic pressure generating groove 11 and the axial dynamic pressure generating grooves 12, 13 can be formed on the outer peripheral ...

Embodiment 2

[0046] Fig. 2 is a schematic vertical sectional view of a hydrodynamic pressure bearing of a second embodiment. As shown in FIG. 2 , the fluid dynamic pressure bearing 1 of the second embodiment differs from the fluid dynamic pressure bearing of the first embodiment in the formation of an adhesive reservoir filled with adhesive 16 .

[0047] In the hydrodynamic pressure bearing 1 of the second embodiment, the upper end portion of the housing 6 is radially expanded to form a radially expanded upper portion 22 . The expanded upper portion 22 is easier to form than the circumferential groove of the first embodiment. The space formed between said radially expanding upper portion 22 and the outer circumferential surface 5c of the sleeve 5 is filled with adhesive 16 to achieve the same effect as the first embodiment.

Embodiment 3

[0049] Fig. 3 is a schematic vertical sectional view of a hydrodynamic pressure bearing 1 of a third embodiment. The hydrodynamic pressure bearing 1 of the third embodiment differs from the hydrodynamic pressure bearing of the first embodiment in that when the sleeve 5 is mounted on the housing 6 and attached thereto, the sleeve 5 and the end plate 7 A positioning part 8 is interposed therebetween.

[0050] The positioning means 8 allow accurate positioning of the sleeve 5 fitted into the housing 6 . This, in turn, allows a predetermined dimension to be accurately formed between the upper surface 4a of the flange portion 4 and the lower end surface 5a of the sleeve 5, and between the lower surface 4b of the flange portion 4 and the upper surface 7a of the end plate 7. Bearing clearance.

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Abstract

A shaft body 2 of a fluid dynamic bearing having a flange portion 4 at one end is supported rotatably via radial direction micro clearances by the sleeve 5 having a dynamic pressure generating groove 11 on the inner peripheral portion. A flange portion 4 is inserted between the lower end surface of the sleeve 5 and end plate 7. A dynamic pressure generating groove 12 is formed on the lower end surface of sleeve 5, and a dynamic pressure generating groove 13 is formed on the upper surface of the endplate 7. The lower end surface of the sleeve 5 and the upper surface of the flange portion 4, and the upper surface of the end plate 7 and the lower surface of the flange portion 4 are facing each other via respective thrust direction micro clearances. Sleeve 5 is inserted into the case 6 such that the upper end surface is projected from the upper end surface of the case 6. The outer peripheral face of the sleeve is fixed at the upper end of the case 6 by filling an adhesive in an adhesive reservoir formed between the sleeve 5 and the case 6. Adhesion and leakage of the adhesive to the locations other than the specified locations to be filled can be prevented, the number of manufacturing steps for the fluid dynamic bearing is reduced, quality is maintained, mass procucibility is improved and low cost production is achieved.

Description

[0001] This application claims priority based on Japanese Patent Application No. 2004-174866 filed on June 11, 2004 and Japanese Patent Application No. 2005-141974 filed on May 13, 2005. technical field [0002] The invention described in this patent application relates to hydrodynamic pressure bearings (bearings) that can be mass-produced at low cost and high quality, especially those suitable for use with spindles for magnetic disks, optical disks, or other memory storage devices such as CDs or DVDs Bearings used with motors. Background technique [0003] In recent years, there has been a strong need for increasingly smaller, thinner, lighter and higher density magnetic disks, optical disks and other memory storage devices for computers. For this reason, an increase in the rotation speed and an increase in rotation accuracy of the spindle motor for disk rotation are required. To meet this need, a rotary bearing such as a hydrodynamic pressure bearing is used instead of a ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F16C17/10F16C33/08F16C33/10F16C35/02
Inventor 小原陆郎
Owner MINEBEA CO LTD