Fluid dynamic bearing motors with different width pump seals and journal bearings
AssigneeSeagate Technology LLC
InventorsJeffry A. LE BLANC, Troy M. Herndon, Robert A. NOTTINGHAM
Life of this patent
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Abstract
In certain embodiments, a motor includes a shaft positioned adjacent a sleeve for relative rotation. The sleeve includes a first radial recirculation channel. The shaft and sleeve form first and second gaps. The first gap is configured to form a pump seal, is positioned above the first radial recirculation channel, and has a width measured between the shaft and sleeve. The second gap is configured to form a journal bearing, is positioned below the first radial recirculation channel, and has a width measured between the shaft and sleeve. The width of the first gap is greater than the width of the second gap.
Claims20
A motor comprising:
- a shaft positioned adjacent a sleeve for relative rotation, wherein the sleeve includes a first radial recirculation channel, and wherein the shaft and sleeve form:
- a first gap configured to form a pump seal, positioned above the first radial recirculation channel, and having a width measured between the shaft and sleeve, and
- a second gap configured to form a journal bearing, positioned below the first radial recirculation channel, and having a width measured between the shaft and sleeve,
- wherein the width of the first gap is greater than the width of the second gap.
A hard drive comprising:
- a base;
- an oil filled motor coupled to the base, wherein the motor comprises:
- a shaft positioned adjacent a sleeve for relative rotation, wherein the sleeve includes a recirculation channel, wherein the shaft and sleeve form:
- a first gap forming a pump seal, positioned above the recirculation channel, and having a width measured between the shaft and sleeve, and
- a second gap forming a journal bearing, positioned below the recirculation channel, and having a width measured between the shaft and sleeve,
- wherein the width of the first gap is larger than the width of the second gap;
- and
- a hub coupled to the sleeve.
Dependencies are inferred from the claim text.