Hydrodynamic bearing device and spindle motor using the same

A fluid bearing and carbon number technology, applied in the field of dynamic pressure fluid bearing devices and spindle motors, can solve the problems of insufficient reliability of the device, shortened device service life, low heat resistance of lubricants, etc., so as to improve the evaporation rate. Effects of improved characteristics, device reliability, and high heat resistance

Inactive Publication Date: 2008-07-09
PANASONIC HEALTHCARE HLDG CO LTD
View PDF3 Cites 2 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] However, although the torque of these conventional fluid bearing devices can be reduced, there are problems in that the amount of evaporation is increased due to the low heat resistance of the lubricant, the service life of the device is shortened, and the reliability of the device cannot b...

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Hydrodynamic bearing device and spindle motor using the same
  • Hydrodynamic bearing device and spindle motor using the same

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0090] The diester formed by 3-methyl-1,5-pentanediol and n-nonanoic acid is used as lubricant.

Embodiment 2

[0092] A diester formed of 3-methyl-1,5-pentanediol and n-decanoic acid was used as lubricant.

Embodiment 3

[0094] The diester formed by 3-methyl-1,5-pentanediol and n-nonanoic acid / n-decanoic acid (molar ratio 50:50) was used as lubricant.

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

PUM

No PUM Login to view more

Abstract

A hydrodynamic bearing device being low in torque, low in power consumption, high in reliability and best suited for miniaturization and a spindle motor using the same. The hydrodynamic bearing device in accordance with the present invention, dynamic pressure generation grooves being provided on at least one of a shaft or a sleeve, and a lubricant being present in a clearance where the above-mentioned shaft and the above-mentioned sleeve are opposed to each other, is characterized in that the above-mentioned lubricant contains diesters obtained from a divalent alcohol having 4 to 8 carbon atoms and having no alkyl side chain at the beta position and one or more kinds of saturated monovalent fatty acids having 9 to 13 carbon atoms.

Description

[0001] This application is a divisional application of the Chinese patent application entitled "Fluid Bearing Device and Spindle Motor Using the Device" with the filing date of March 31, 2005 and the application number of 200510056240.4. technical field [0002] The present invention relates to a dynamic pressure type fluid bearing device and a spindle motor using the same. Background technique [0003] Fluid bearings consist of a shaft and a sleeve supporting the shaft, and lubricant exists in the gap between the two. Through the dynamic pressure generating groove formed in the shaft or the sleeve, as the shaft rotates, the lubricant gathers and generates pressure, and the shaft is supported by the sleeve in a non-contact state. This enables high-speed rotation and reduces noise during rotation. [0004] Spindle motors equipped with this fluid bearing device are being used for information setting and audio-visual equipment represented by magnetic disk devices because they ...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

Application Information

Patent Timeline
no application Login to view more
IPC IPC(8): F16C17/10F16C33/10C10M105/38C10M105/42C10M169/04C10N30/06C10N40/02C10N40/06H02K7/08
Inventor 平田勝志白石孝範大野英明
Owner PANASONIC HEALTHCARE HLDG CO LTD
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Try Eureka
PatSnap group products