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Dynamic pressure bearing device

A technology of dynamic pressure bearings and thrust bearings, which is applied in the direction of sliding contact bearings, bearings, rotating bearings, etc., can solve the problems of unavoidable deformation of dynamic pressure grooves, and achieve low-cost effects

Inactive Publication Date: 2009-04-15
NTN CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in this case, since the bush is formed of resin, deformation of the dynamic pressure groove due to shrinkage during molding cannot be avoided, and it is difficult to form the dynamic pressure groove with high precision.

Method used

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no. 1 approach

[0065] The first embodiment of the present invention has been described above, but the present invention is not limited to this embodiment, and can be applied to dynamic pressure bearing devices of other structures.

[0066] In the first embodiment described above, it was explained that the protrusion 10d is integrally provided on the holding member 10 as a molded part, and the sealed space S is formed between the inner peripheral surface 10d1 of the protrusion 10d and the tapered surface 8b of the case part 8. case, but other structures are also possible. That is, in order to form the sealed space S, the protruding portion 10d is not essential, and the sealed space can also be formed between the housing portion 8 (fixed member 6 ) by partially changing the shape of the holding member 10 . Figure 5 As an example, a second cylindrical portion 10e extending downward from the outer peripheral edge of the disk portion 10a and a lower end of the second cylindrical portion 10e are ...

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PUM

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Abstract

A dynamic pressure bearing device where a dynamic pressure creation section formed with high shape forming accuracy is formed at low cost. A rotating member (2) has a shaft (9) and a holding member (10) provided at one end of the shaft (9) and functioning as a thrust member. In a part of an annular region of a lower end surface (10a1) of a circular disc section (10a) forming the holding member (10), there is formed a region as the dynamic pressure creation section. This region has dynamic pressure grooves (10a2) and partition sections (10a3) that are spirally arranged between the dynamic pressure grooves (10a2) and individually define the grooves (10a2). The region where the dynamic pressure grooves (10a2) are arranged faces an upper end surface (8a) of a housing (8), and when the shaft (9) rotates, the region forms a thrust bearing gap of a thrust bearing section (T) between the region and the upper end surface (8a). The region where the dynamic pressure grooves (10a2) are arranged is formed on the lower end surface (10a1) by press working.

Description

technical field [0001] The invention relates to a dynamic pressure bearing device. Background technique [0002] The dynamic pressure bearing device is a member that supports the rotating member without contact by the action of the dynamic pressure of the fluid generated in the bearing gap between the fixed member and the rotating member. This kind of bearing device is a component that has the characteristics of high-speed rotation, high-speed rotation accuracy, and low noise. It is used as a bearing device for motors mounted on various electrical equipment such as information equipment, and more specifically as a magnetic disk device such as HDD. Bearing units for spindle motors of disc drives such as CD-ROM, CD-R / RW, DVD-ROM / RAM and other optical disk devices, MD, MO and other optical disk devices, or polygon scanners as laser beam printers (LBP) Bearing devices for motors such as motors, color wheel motors of injectors, and fans are preferably used. [0003] For example...

Claims

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Application Information

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IPC IPC(8): F16C17/10
CPCF16C2370/12F16C33/107F16C17/107
Inventor 伊藤健二古森功
Owner NTN CORP