Bearings – Rotary bearing – Fluid bearing
Reexamination Certificate
2008-05-20
2008-05-20
Hannon, Thomas R. (Department: 3682)
Bearings
Rotary bearing
Fluid bearing
C384S107000
Reexamination Certificate
active
07374341
ABSTRACT:
The invention relates to a hydrodynamic bearing arrangement for an electric motor, particularly for a spindle motor to drive the platters of a hard disk drive. The bearing arrangement comprises a shaft, a bearing bush and a thrust plate disposed fixedly on the shaft, the shaft and the thrust plate rotating with respect to the bearing bush, grooved patterns to generate fluid-dynamic pressure being provided on the thrust plate and/or the surfaces located opposite the thrust plate of the bearing sleeve and/or the cover plate. The grooved pattern comprises a number g of grooves distributed over the surface of the bearing sleeve, the thrust plate or the cover plate, wherein in the shaft and/or in the thrust plate, a number h of holes and/or recesses are provided at the inner edge of the thrust plate and/or at the outer edge of the shaft. According to the invention, the number g of grooves cannot be integrally divided by the number h of holes and likewise that h cannot be integrally divided by g.
REFERENCES:
patent: 5433529 (1995-07-01), Hensel
patent: 5988886 (1999-11-01), Takahashi
patent: 2003/0016891 (2003-01-01), Gomyo et al.
US 5,794,074, 08/1998, Rahman et al. (withdrawn)
Cooper & Dunham LLP
Hannon Thomas R.
Minebea Co. Ltd.
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