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Hydrodynamic bearing device

A technology for dynamic pressure bearings and bearing sleeves, which is applied in the direction of sliding contact bearings, bearings, and rotating bearings. Ease of manufacturing and fixing work, reduction of radial bearing clearance

Inactive Publication Date: 2011-01-26
NTN CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] In addition, in bonding, pressing, and any fixing device, when the linear expansion coefficient of the shell is larger than that of the bearing sleeve, due to the difference in thermal contraction between the two when the temperature drops, the bearing sleeve is pressed from the shell, and its inner diameter Shrinkage, for the same reason as above, may have an adverse effect on the performance of radial bearings

Method used

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Embodiment Construction

[0060] Hereinafter, embodiments of the present invention will be described with reference to the drawings.

[0061] figure 1 A dynamic pressure bearing device (fluid dynamic pressure bearing device) 1 of the present invention is shown. This dynamic pressure bearing device 1 supports the rotation of a main shaft by, for example, a motor incorporated in an HDD, particularly a server HDD. In this dynamic pressure bearing device 1, a plurality of, for example, two bearing sleeves 3, 4 are housed inside the housing 2 at positions spaced apart from each other in the axial direction, and a plurality of bearing sleeves 3, 4 are inserted into the inner peripheral surfaces of the bearing sleeves 3, 4. The shaft member 5 is constituted as a main component.

[0062] As described below, the first radial bearing portion R1 is provided between the inner peripheral surface 3a of the bearing sleeve 3 and the outer peripheral surface 5a of the shaft member 5, and the first radial bearing port...

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PUM

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Abstract

A hydrodynamic bearing device which has high loading capability against moment load, and in which manufacture and fixing operation of a bearing sleeve can be easily performed, and a required fixing force can be kept. The bearing sleeve (3) is inserted onto the inner peripheral surface (2a) of a housing, and its lower end face (3c) is secured to the upper end face (2c2) of a spacer part (2c) with an adhesive agent (A1). Also, the bearing sleeve (4) is inserted into the inner peripheral surface (2b) of the housing, and its upper end face (4c) is fixed to the lower end face (2c3) of the spacer part (2c) with an adhesive (A2).

Description

technical field [0001] The present invention relates to a dynamic pressure bearing device. Background technique [0002] Generally, a dynamic pressure bearing device supports a shaft member in non-contact under the action of hydrodynamic pressure generated in a bearing gap. This type of bearing unit has the characteristics of high-speed rotation, high rotation accuracy, and low noise, and is suitable for use as a bearing unit for motors mounted on various electrical equipment represented by information equipment, and more specifically, as a magnetic disk such as HDD. Bearing devices for spindle motors such as CD-ROM, CD-R / RW, DVD-ROM / RAM and other optical disk devices, MD, MO and other optical disk devices, or as ultra-high-speed polygonal scanning motors for laser printers (LBP) , Projector color wheel motors, fan motors and other motor bearing devices. [0003] For example, in a dynamic pressure bearing device mounted on a spindle motor of a disk drive such as an HDD, bo...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): F16C17/26F16C17/10
Inventor 堀政治户田正明古森功
Owner NTN CORP