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Disk drive spindle air bearing
| Details |
Inventors: Bodmer, James; Chen, Shuo-Hao;
Assignee: Maxtor Corporation (Boulder, CO)
Primary Examiner: Evans; Jefferson
Assistant Examiner:
Attorney, Agent or Firm: Sheridan Ross P.C.
A disk drive spindle air bearing is disclosed having increased bearing stiffness, while being capable of manufacture using conventional tolerances. The invention therefore allows the construction of a disk drive spindle bearing without the need for oil or grease that may potentially contaminate the storage disks. The disclosed disk drive spindle air bearing also provides an air bearing having low acoustical noise and power consumption characteristics. |
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DETAILED DESCRIPTION The present invention relates to an air bearing apparatus for use in hard disk drive spindle motors.
In particular, the invention provides an air bearing having a large surface area, to increase the stiffness of the bearing, while allowing the bearing to be manufactured with conventional oil filled bearing type tolerances.
In a preferred embodiment, the air bearing is used in conjunction with an inside out underslung motor to further increase the area of the bearing.
In addition, the present invention includes a method for providing a disk drive device with a bearing having air as its lubricating fluid, and providing adequate levels of stiffness while being capable of manufacture using conventional tolerances.
The device includes a computer hard disk drive having a base.
Affixed to the base is a stationary shaft having an enlarged bearing portion and a spindle portion.
The diameter of the bearing portion of the shaft is approximately four times greater than that of the spindle portion.
Enveloping the bearing portion of the stationary shaft is a hub having an internal cylindrical bore that is concentric to the stationary shaft and adjacent to the bearing portion of that shaft.
The top portion of the cylindrical bore is adjacent to the top of the bearing.
Also interconnected to the hub is a thrust plate, concentric to the stationary shaft and adjacent to a bottom of the bearing.
Between the cylindrical bore in the hub and the bearing portion of the stationary shaft, and between the thrust plate and the bottom of the bearing, are fluid filled gaps.
In a preferred embodiment, the fluid filling these gaps is air.
In a further preferred embodiment of the device, the bearing has a plurality of grooves on the top, side and bottom surfaces of the bearing.
In a most preferred embodiment, the device further includes grooves on the top, side, and bottom surfaces of the bearing that are arrayed in a herring bone pattern, and that have a square or semi-circular cross section.
In a further embodiment, a disk storage drive is disclosed having a stationary shaft with a bearing portion having a length that is less than about 90% of its diameter
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Generators or Motors 
