Hydrodynamic pressure bearing, spindle motor in which it is...

Bearings – Rotary bearing – Fluid bearing

Reexamination Certificate

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C384S132000

Reexamination Certificate

active

06854889

ABSTRACT:
Spindle-motor hydrodynamic bearing configuration having conical taper seals on the thrust-bearing ends. The spindle motor shaft is supported in a bore through the rotor by neighboring radial and thrust hydrodynamic bearings constituted through radial micro-gaps cylindrically between the shaft and rotor, axial micro-gaps between thrust plates on either shaft end and recesses endwise in the rotor bore, dynamic-pressure-generating grooves in the micro-gap forming surfaces, and lubricant retained continuously in the radial and axial micro-gaps. The thrust plates are at least partially conical, tapering axially outward. A ring fitted in each rotor bore recess has a conical inner peripheral surface corresponding to the opposing conical surface of the thrust plate, forming a taper seal sloped with respect to the rotational axial center of the motor. The gap clearance dimension gradually expands heading axially outward, wherein the lubricant forms an axial-end gas-liquid interface to function as a taper seal.

REFERENCES:
patent: 5558445 (1996-09-01), Chen et al.
patent: 5768784 (1998-06-01), Williams et al.
patent: 5876124 (1999-03-01), Zang et al.
patent: 6118620 (2000-09-01), Grantz et al.
patent: 6404087 (2002-06-01), Ichiyama
patent: 20020053845 (2002-05-01), Herndon et al.
patent: 20030133633 (2003-07-01), Nakamura
patent: 2000-354349 (2000-12-01), None

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