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Motor including hydrodynamic bearings with pair of thrust plates
| Details |
Inventors: Ichiyama, Yoshikazu;
Assignee: Nidec Corporation (Kyoto, JP)
Primary Examiner: Nguyen; Tran
Assistant Examiner:
Attorney, Agent or Firm: Judge; James
Disk-drive motor having two hydrodynamnic bearing sections separated with respect to the shaft by an air intervention, each composed of a radial and a thrust dynamic-pressure bearing portion, and in each of which lubricant is retained continuously throughout the radial and thrust bearing portions At least one communicating pathway is formed in the sleeve, axially communicating the thrust faces that are constituents of, and retaining lubricant continuously with, the pair of thrust bearing portions. Via the communicating pathway, the lubricant retained in the two hydrodynamic bearing sections shifts mutually from the one section to the other, such that the radii of curvature of the meniscuses forming the respective boundaries arc equalized. The amount of lubricant held in the bearing sections is accordingly equalized and lubricant leaking out of the radial bearing portions is taken up and re-circulated. |
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DETAILED DESCRIPTION An object of the present invention is to increase the usable life span of hydrodynamic-bearing-equipped disk-drive motors.
Another object is to improve the reliability and endurance of such disk-drive motors.
A still further object of the invention is, in disk-drive motors equipped with hydrodynamic bearings having bearing sections separated by an air intervention, to equalize the amount of lubricant held in the bearing sections and to take up and re-circulate again to the bearing sections lubricant leaking out of the radial dynamic-pressure bearing portions, in order to maximize rotation stability toward increasing usable life span.
A motor of the present invention is furnished with two hydrodynamic bearing sections separated with respect to the shaft by an air intervention, each composed of a radial and a thrust dynamic-pressure bearing portion, and in each of which lubricant is retained continuously throughout the radial and thrust bearing portions.
The boundaries of the lubricant retained in the two bearing sections front on air.
The lubricant boundaries are meniscuses formed by the balancing of the energy of the lubricant itself (the surface tension and intermolecular forces of the lubricant) and of external energy (air pressure of the air contacting the lubricant boundaries and the surface energy of the motor bearing components).
At least one communicating pathway is formed in the sleeve, axially communicating the thrust faces that are constituents of the thrust dynamic-pressure bearing portions of the two bearing sections, the communicating pathway retains lubricant continuously with the pair of thrust bearing portions.
Via the communicating pathway, the lubricant retained in the two hydrodynamic bearing sections shifts mutually from the one section to the other, such that the radii of curvature of the meniscuses forming the respective boundaries are equalized.
A quantitative imbalance occurring between the amounts of lubricant retained in the two bearing sections, for example, when lubricant dislodged from one of the radial dynamic-pressure bearing portions is displaced to the other, means that a discrepancy in the radii of curvature of the meniscuses will arise
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Generators or Motors 
