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US 7,008,110 B2Granted
Hydrodynamic pivot bearing
AssigneeMinebea Co., Ltd.
InventorsAndreas Kull, Olaf Winterhalter, Joerg Hoffmann, Martin Hafen
Life of this patent
Estimating the term…
Abstract
The present invention provides a bearing comprised of a hydrodynamic bearing and a pivot bearing, which can be used with a spindle motor. It also provides a spindle motor utilizing a hydrodynamic bearing and a pivot bearing.
Claims5
A spindle motor comprising:
- a stator;
- a rotor;
- a pivot bearing;
- a fluid dynamic journal bearing;
- a counter-plate;
- a fluid dynamic thrust bearing;
- wherein said stator comprises a bracket, a sleeve affixed to said bracket, a core affixed to said bracket, and coils wound around said core;
- said rotor comprises a shaft, a rotating hub, and a rotor magnet;
- said pivot bearing comprises a pivot point at an end of said shaft rotating on said sleeve;
- said fluid dynamic journal bearing comprises said shaft, said sleeve, a fluid, and pressure generating grooves formed on a vertical surface of one of said shaft and said sleeve;
- said counter plate is affixed to said sleeve and positioned partially over said shaft;
- and
- said fluid dynamic thrust bearing comprises said shaft, said counter-plate, said fluid, and pressure generating grooves formed on a horizontal surface of one of said shaft and said counter-plate.
10 more elements
A spindle motor comprising:
- a stator;
- a rotor;
- a pivot bearing;
- a fluid dynamic journal bearing;
- a counter-plate;
- a fluid dynamic thrust bearing;
- wherein said stator comprises a bracket, a shaft affixed to said bracket, a core affixed to said bracket, and coils wound around said core;
- said rotor comprises a sleeve, a rotating hub affixed to said sleeve, and a rotor magnet affixed to said hub;
- said pivot bearing comprises said sleeve rotating on a pivot point at an end of said shaft;
- said fluid dynamic journal bearing comprises said shaft, said sleeve, a fluid, and pressure generating grooves formed on a vertical surface of one of said shaft and said sleeve;
- said counter plate is affixed to said sleeve and positioned partially under said shaft;
- and
- said fluid dynamic thrust bearing comprises said shaft, said counter-plate, said fluid, and pressure generating grooves formed on a horizontal surface of one of said shaft and said counter-plate.
10 more elements
A bearing for a spindle motor comprising
- a shaft;
- a bearing sleeve surrounding the shaft at a small radial distance;
- a counter-plate affixed to the bearing sleeve;
- wherein
- said shaft has a rounded end, a large diameter portion, a small diameter portion, and a horizontal portion that is located at a boundary between the large diameter portion and the small diameter portion;
- a fluid dynamic journal bearing is provided at the large diameter portion of said shaft;
- a fluid dynamic thrust bearing is provided at the horizontal portion of said shaft;
- a capillary seal is provided at the small diameter portion of said shaft;
- and
- a pivot bearing is provided at the rounded end of said shaft.
7 more elements
Dependencies are inferred from the claim text.