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Fluid dynamic bearing apparatus and process for manufacturing the same

A fluid bearing and radial bearing technology, applied in the direction of bearings, bearing components, shafts and bearings, etc., can solve the problems of insufficient lubricating oil and reduced lubricating oil, and achieve the effect of curbing lubricating oil immersion

Inactive Publication Date: 2009-05-13
NTN CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At this time, it is likely to cause the amount of lubricating oil inside the bearing to decrease, so that the amount of lubricating oil that can circulate inside the bearing is insufficient.

Method used

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  • Fluid dynamic bearing apparatus and process for manufacturing the same
  • Fluid dynamic bearing apparatus and process for manufacturing the same
  • Fluid dynamic bearing apparatus and process for manufacturing the same

Examples

Experimental program
Comparison scheme
Effect test

Embodiment

[0073] In order to verify the effect of the present invention, the resin composition composed of many finely divided carbon fibers with different binders or no binders is required for the housing part of the fluid bearing device. The oil absorption resistance was evaluated.

[0074] Specifically, formed by the resin composition shown in Fig. 7 Image 6 The illustrated case portion 27 evaluates the oil absorption resistance of the resin case portion by measuring the amount of drop in the oil level in the sealed space S in the fluid bearing device 21 equipped with the case portion 27 . When the drop in oil level is less than 0.03 mm 10 days after the start of the measurement, and thereafter (after 20 days) there is no tendency to drop the oil level, the casing meets the oil absorption resistance requirements. Here, five kinds of thermoplastic resins such as PPS and LCP are used as the base resin. Carbon fibers used as fillers are carbon fibers using epoxy resins, nylon resins,...

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PUM

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Abstract

In this type of fluid dynamic bearing apparatus, even in the case of carbon fiber blending, there is provided a resin member capable of minimizing the penetration of lubricating oil. Housing part (7) as a resin member is obtained by injection molding of a PPS base resin composition loaded with carbon fiber. The housing part (7) is brought into contact with an ester lubricating oil filling the interior of the bearing. In that instance, the above resin composition is obtained by cutting a multiplicity of carbon fibers bound by a binder not containing any urethane resin and blending the carbon fibers fragmentized by the cutting in PPS.

Description

technical field [0001] The invention relates to a fluid bearing device and a manufacturing method thereof. Background technique [0002] A fluid bearing device is a member that supports a rotating member so that it can rotate freely by utilizing a lubricating film of fluid generated in a bearing gap between a fixed member and a rotating member. This kind of bearing device has the characteristics of high rotation speed, high rotation accuracy and low noise. It is suitable as a bearing device for motors mounted on various electrical equipment including information equipment, more specifically, as a magnetic disk device such as HDD, CD-ROM, CD-R / RW, DVD-ROM / Optical disk devices such as RAM, bearing devices for spindle motors of disk drives in optical disk devices such as MD and MO, or motors suitable for multifunctional scanner motors of laser printers (LBP), color wheel motors of projectors, fan motors, etc. Use bearings. [0003] For example, in a fluid bearing device inc...

Claims

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Application Information

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IPC IPC(8): F16C33/20F16C17/10
CPCF16C33/201F16C2370/12F16C33/107F16C17/107Y10T29/49639F16C33/20F16C17/00F16C33/04
Inventor 伊藤健二
Owner NTN CORP
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