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Shaft member for fluid bearing device, manufacturing method therefor, and fluid bearing device

A technology of fluid bearings and manufacturing methods, which is applied in the direction of bearing components, bearings, manufacturing tools, etc., which can solve the problems of reduced grinding accuracy, inconsistent sliding shoe support positions, and reduced bearing performance, and achieve axial width stability and shortened grinding Time, the effect of improving bearing performance

Active Publication Date: 2018-04-03
NTN CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in this case, it is impossible to make the sliding shoe contact the shaft blank over the entire surface, and the two can only be contacted in a limited narrow area, so there is a problem that the supporting position of the sliding shoe is inconsistent during mass production
Therefore, it leads to a reduction in grinding accuracy, which is the main cause of the reduction in bearing performance.

Method used

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  • Shaft member for fluid bearing device, manufacturing method therefor, and fluid bearing device
  • Shaft member for fluid bearing device, manufacturing method therefor, and fluid bearing device
  • Shaft member for fluid bearing device, manufacturing method therefor, and fluid bearing device

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Embodiment Construction

[0054] Embodiments of the present invention will be described below based on the drawings.

[0055] As an example of a fluid bearing device, the figure 1 A hydrodynamic bearing arrangement for a general-purpose HDD is shown in .

[0056] This fluid dynamic pressure bearing device has a bottomed cylindrical housing 1, a cylindrical bearing member 2 fixed to the inner periphery of the housing 1, a shaft member 3 inserted into the inner periphery of the bearing member, and The sealing member 4 configured in the opening.

[0057] The housing 1 has a cylindrical side portion 1a and a bottom portion 1b that closes an opening at one axial end of the side portion 1a. The bottom portion 1b of the housing 1 may be formed integrally with the side portion 1a instead of being formed separately from the side portion 1a. The shaft member 3 is formed of stainless steel or the like, and has a shaft portion 3a and a flange portion 3b provided at one axial end of the shaft portion 3a. The s...

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Abstract

The present invention provides a shaft member for fluid bearing device, a manufacturing method therefor, and a fluid bearing device. The shaft member comprises two bearing surfaces (31,32) separated from each other at the outer circumference in the axial direction, and a central recessed section (33) formed between the bearing surfaces (31,32) and having a smaller diameter than the bearing surfaces. The central recessed section (33) is provided with a cylindrical surface section (331) comprising a grinding surface, and a step sections (332) arranged on both sides of the cylindrical surface section in the axial direction and having a different diameter than the cylindrical surface section.

Description

technical field [0001] The present invention relates to a shaft member for a fluid bearing device, a manufacturing method thereof, and a fluid bearing device. Background technique [0002] Conventionally, as a bearing device supporting a shaft of a small motor or the like, a fluid bearing device in which a shaft member is rotatably supported by forming a lubricating fluid film between the shaft member and the bearing member has been widely used. Among fluid bearing devices, fluid dynamic pressure bearing devices that generate fluid dynamic pressure in the bearing gap through dynamic pressure generating grooves formed on the outer peripheral surface of the shaft member or the inner peripheral surface of the bearing member are widely used in applications that require high-speed rotation or high rotation accuracy. For example, it is widely used as a bearing device in polygon mirror scanning motors of laser printers, small fan motors for cooling, and motors for hard disk drives....

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F16C3/02F16C17/10B24B5/04
CPCF16C3/02F16C17/10B24B5/042F16C2220/70B21K1/06B24B5/04B24B41/06F16C33/14F16C2370/12F16C17/26F16C2220/62F16C33/1075B23B1/00F16C33/10
Inventor 平出淳山乡正志藤原干久栗村哲弥
Owner NTN CORP
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