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Both ends open fluid dynamic bearing having a journal in combination with a conical bearing
| Details |
Inventors: Rahman, Mohamed Mizanur; Heine, Gunter Karl; Leuthold, Hans; Khan, Raquib Uddin;
Assignee: Seagate Technology LLC (Scotts Valley, CA)
Primary Examiner: Tupper; Robert S.
Assistant Examiner:
Attorney, Agent or Firm: Thomason, Moser & Patterson, LLP
A method of creating an improved hydrodynamic fluid bearing is provided which is relatively insensitive to shock vibration changes in load and rotational speed. The hydrodynamic bearing motor in which the bearing is open at both the upper and lower ends, and in which the balance of fluid flow within the bearings is maintained. The assembly of the hydrodynamic bearing is more easily assembled, and the gaps are easily adjusted. In the design of the hydrodynamic bearing, the tolerances for assembly of the various components is minimized; that is, the critical nature of many of the gaps is diminished. |
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DETAILED DESCRIPTION Thus, it is an object of the present invention to create an improved hydrodynamic fluid bearing which is relatively insensitive to shock, vibration, changes in load and rotational speed.
Yet another objective of the present invention is to provide a hydrodynamic bearing motor in which the bearing is open at both the upper and lower ends.
A related objective of the invention is to provide a hydrodynamic bearing open at both ends in which the balance of fluid flow within the bearings is maintained.
Yet another object of the present invention is to provide a hydrodynamic bearing assembly which is more easily assembled, and in which the gaps are easily adjusted.
A further objective of the invention is to provide a hydrodynamic bearing design in which the tolerances for assembly of the various components is minimized; that is, the critical nature of many of the gaps is diminished.
Another objective of the invention is to provide a hydrodynamic bearing useful in a spindle motor or the lice which is stiffer than known standard spindle motors which are supported only at one end.
A further objective of the invention is to design a hydrodynamic bearing useful in a spindle motor or the like in which the motor could be attached to both the top cover and the base of the housing for the spindle motor.
These and other objectives of the invention are achieved by a hydrodynamic fluid bearing useful in a bearing cartridge which cartridge may be incorporated into a spindle motor or the like, where the bearing includes a shaft, a conical bearing supported on the shaft, and journal bearings located at least on one side and typically both above and below the conical bearing.
A sleeve is mounted for rotation relative to the shaft and defines, in cooperation with the shaft, the gaps necessary for both the conical hydrodynamic bearing and the axial journal bearings.
At the ends of the shaft, capillary seals are defined between the sleeve and the shaft so that fluid does not escape from the hydrodynamic bearing
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Generators or Motors 
