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Dynamic pressure bearing device

A bearing device and dynamic pressure bearing technology, which is applied to sliding contact bearings, bearings, bearings in rotary motion, etc., can solve the problems of reduced cleanliness of bearing devices or recording disk drive devices, hard disk contamination, etc., to ensure cleanliness, low cost effect

Inactive Publication Date: 2009-07-08
NTN CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In particular, when a bearing device is used in a recording disk drive device such as a hard disk, the cleanliness of the bearing device or recording disk drive device is reduced due to the outgassing generated in a high-temperature atmosphere, such as contamination of the surface of the disk such as a hard disk, etc.

Method used

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Examples

Experimental program
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Effect test

no. 1 approach

[0087] The first embodiment of the present invention has been described above, but the present invention is not limited to this embodiment.

[0088] E.g, figure 2 In the illustration, the thrust bearing part T1 is formed between the upper end surface 7a1 of the cover body and the hub part 9, but the thrust bearing part may be formed between the upper end surface 10a of the bottom member 10 and the lower side of the flange part 11. formed between the end faces 11b. In addition, in the above-mentioned examples, it was described that a kind of matrix resin (polyphenylene sulfide) was mixed with carbon fibers, but other thermoplastic resins and thermoplastic resins may be added as long as the effects of the present invention are not hindered. Organic substances such as curable resins or rubber components, and organic substances such as metal fibers, glass fibers, and whisker fibers may be added in addition to carbon fibers. For example, polyvinyl chloride (PTFE) can be added as...

Embodiment 1

[0090] In order to clarify the usefulness of the present invention, the evaluation of the properties required for the cover body 7 was performed with respect to a plurality of resin compositions having different compositions. One kind of straight-chain type and two kinds of cross-linked polyphenylene sulfide (PPS), polyether sulfonate (PES) and polycarbonate (PC) are used in the matrix resin. In addition, in the filler compounded with the matrix resin, such as Figure 5 As shown in (a), any one of three types of carbon fibers (two types of PAN type and one type of pich type) having different fiber diameters and fiber lengths (different aspect ratios) was used. Examples of combinations and combinations of these matrix resins and fillers (carbon fibers) Figure 5 (b) shown.

[0091]In addition, in this example, LC-5G manufactured by Dainippon Inki Chemical Co., Ltd. was used as linear polyphenylene sulfide (PPS), and in order from No. 1, LC-5G manufactured by Dainippon Inki Ch...

Embodiment 2

[0134] In order to prove the applicability of the present invention, any one in polyether ketone (PEEK), polyphenylene sulfide (PPS), polyamide (PA) is used as base material, to carbon fiber, inorganic fiber (aluminum borate whisker, Zinc oxide whisker) and carbon black were used as fillers to form the cover body 7 after changing their respective mixing ratios, and the characteristics required for the cover body 7 were compared.

[0135] In addition, in this example, H3110 manufactured by Nippon Steel Chemical Co., Ltd. was used as the ester lubricating oil, PEEK150P manufactured by Victrex MC Co., Ltd. was used as the polyether ketone (PEEK), and Polyplastics ( Fo-Tron 0220A9 manufactured by Co., Ltd. was used as polyphenylene sulfide (PPS), Geenesta N1000 manufactured by Kuraray Co., Ltd. was used as polyamide (PA), and Besufite HTA-C6- manufactured by Tobang Tenac Co., Ltd. was used. E As the carbon fiber, Alborex Y manufactured by Shikoku Chemical Industry Co., Ltd. was us...

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Abstract

The present invention can manufacture a smaller-sized cover at low cost, and at the same time can maintain the cleanliness of the dynamic pressure bearing device by suppressing ion elution from the resin part, and can exert the required bearing performance. The dynamic pressure bearing device (1) has: a shaft sleeve (8) fixed on the inner periphery of the cover body (7); a rotating member that rotates relative to the shaft sleeve (8) and the cover body (7). The dynamic pressure of the generated lubricating fluid supports the rotating member in the radial direction and thrust direction without contact. The cover (7) uses polyphenylene sulfide (PPS) as a matrix resin, and is injection-molded with a resin composition that uses PAN-based carbon fibers as a filler.

Description

technical field [0001] The present invention relates to a dynamic pressure bearing device. This dynamic pressure bearing device is suitable as a bearing device for small motors of information equipment or electric equipment. Among them, information equipment includes, for example, magnetic disk devices such as HDD, optical disks such as CD-ROM, CD-R / RW, DVD-ROM / RAM, etc. Devices, MD, MO and other optical disk devices, such as spindle motors, multilateral scanning of laser printers (LBP), and color wheels of projectors; motors include axial fans, etc. Background technique [0002] For the above-mentioned various motors, in addition to high rotational accuracy, high speed, low cost, low noise, light weight, etc. are also required. One of the constituent elements that determine these required performances is a bearing that supports the spindle of the electric motor. In recent years, as such a bearing, the use of a dynamic pressure bearing having the characteristics excellent i...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): F16C17/10F16C35/02B29C45/34F16C33/10H02K7/08B29K105/12
Inventor 村上和丰江上正树岛津英一郎伊藤健二里路文规
Owner NTN CORP