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Gas dynamic pressure bearing unit, spindle motor, hard disk drive and polygon scanner

A technology of gas dynamic pressure bearing and spindle motor, which is applied in bearing components, sliding contact bearings, bearings in rotary motion, etc., and can solve problems such as insufficient rigidity of the bearing system.

Inactive Publication Date: 2005-02-02
NIDEC CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although a part of the dust particles is captured in the process of passing through the through holes, the rigidity of the bearing system is insufficient because the pressure of the lubricating gas is reduced due to the through holes

Method used

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  • Gas dynamic pressure bearing unit, spindle motor, hard disk drive and polygon scanner
  • Gas dynamic pressure bearing unit, spindle motor, hard disk drive and polygon scanner
  • Gas dynamic pressure bearing unit, spindle motor, hard disk drive and polygon scanner

Examples

Experimental program
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Effect test

no. 1 example

[0030] A first embodiment of the present invention will be described below with reference to FIGS. 1, 2 and 5. FIG.

[0031] The gas dynamic pressure bearing system 9 shown in FIG. 1 includes a fixed part 1 and a rotating part 2 . The radial bearing 3 and the thrust bearing 4 rotatably support the rotating part 2 so that the rotating part 2 can rotate relative to the fixed part 1 .

[0032] The fixed part 1 includes a shaft 14 and two thrust plates 15 separated from each other in the axial direction of the shaft 14 . One surface of each thrust plate 15 radially expands to constitute a plane of the fixed portion, and the thrust bearing surface 13 is formed on the plane.

[0033] The shaft 14 includes an inner shaft 14a and an outer shaft 14b sleeved on the inner shaft 14a. By mounting the outer shaft 14b, said shaft is formed with a cylindrical enlargement. The outer peripheral surface of the enlarged part is the radial bearing surface 11 . The lower surface of the thrust p...

no. 2 example

[0051] Next, a second embodiment of the present invention will be described with reference to FIG. 7 .

[0052] FIG. 7 is a sectional view of a spindle motor 64 having the aerodynamic pressure bearing system 9 of the present invention.

[0053] The gas dynamic pressure bearing system 9 includes radial dynamic pressure generating groove rows 32 and 32, and two radial bearings separated from each other along the extending direction of the shaft. The gas dynamic pressure bearing system 9 also includes thrust dynamic pressure generating groove rows 42 and 42 provided on two opposite thrust plates, and includes two thrust bearings that generate support forces in opposite directions. The double wire shown on the sleeve with the figure 2 The double lines shown have the same meaning. The dynamic pressure generating grooves on the thrust bearing increase the gas pressure towards the radial bearing, which gas lubricates the bearing surfaces. The dynamic pressure generating grooves on...

no. 3 example

[0060] Figure 8 Shown is a third embodiment of the invention.

[0061] Figure 8 A data storage disk drive 910 with a spindle motor of the present invention is shown.

[0062] In the housing 911 of the data storage disk drive 910, the recording disk 932 is mounted on the spindle motor 9, and the magnetic head 916 supported by the swing arm 915 is opposed to a surface of the disk 932 with a slight distance (slight gap). When particles enter the minute gap, the particles damage the surface of the recording disk and the magnetic head, and cause errors in reading and writing of information. Therefore, particles should not be present within the housing 911 .

[0063] When the spindle motor of the present invention is used in a data storage disk drive, since it is difficult to discharge particles into the housing 911, the spindle motor can rotate at a high speed and ensure the reliability of the data storage disk drive.

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PUM

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Abstract

It is the object of this invention to provide a gas dynamic pressure bearing system with high rigidity and reliability. The unit is configured such that a thrust bearing sends lubricating gas under pressure in a radial direction, and a radial bearing sends the gas toward the thrust bearing, thereby increasing the bearing rigidity. In addition, one or more dynamic pressure generating grooves which constitute the thrust bearing are extended and connected to a particle catching holes formed in a shaft. With those configurations, the dust particles are trapped in the catching hole and are kept away from the bearing gaps.

Description

technical field [0001] The invention relates to a gas dynamic pressure bearing system. The invention also relates to a spindle motor, a data storage disk drive and a polygon scanner utilizing the gas dynamic bearing system. Background technique [0002] In recent years, there have been increasing demands to increase the access speed of information of a hard disk drive or an optical disk drive and to improve the printing quality and speed of digital copiers and laser printers. In order to meet these requirements, the rotational speed and accuracy of the spindle motors used in the machines have been increased. There is also a need for higher precision spindle motors for these machines. [0003] In order to improve the rotational speed and accuracy of the spindle motor, it has been proposed to use an aerodynamic pressure bearing system as the bearing system of the spindle motor. The gas dynamic pressure bearing system supports the rotating member in a non-contact manner by d...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B41J2/44F16C17/02F16C17/04F16C17/10F16C33/10G02B26/12G11B19/20H02K5/16H02K7/08
CPCG11B19/2009F16C33/107F16C17/107F16C2370/12F16C33/1015
Inventor 林丈雄
Owner NIDEC CORP