Patents by Inventor Mohamed Mizanur Rahman
Mohamed Mizanur Rahman has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).
-
Publication number: 20090142009Abstract: Fluid dynamic bearing systems produced by specified methods are provided. In one example, a method for designing a fluid dynamic bearing system includes determining a first stability ratio for a first journal bearing configuration. The method further includes determining a second stability ratio for a second journal bearing configuration. In a further example system, the first configuration has two sub-journal bearings and the second configuration has three sub-journal bearings. The method may comprise comparing the two stability ratios to determine whether adding a sub-journal increases the stability ratio of the bearing system.Type: ApplicationFiled: February 6, 2009Publication date: June 4, 2009Applicant: Seagate Technology LLCInventors: Troy Michael Herndon, Jeffry Arnold LeBlanc, Robert Alan Nottingham, Mohamed Mizanur Rahman
-
Patent number: 7493695Abstract: A method of designing an improved bearing system is provided. In one embodiment, the method for designing a fluid dynamic bearing system includes determining a first stability ratio for a first journal bearing configuration. The method further includes determining a second stability ratio for a second journal bearing configuration. In one embodiment, the first configuration has two sub-journal bearings and the second configuration has three sub-journal bearings. The two stability ratios may then be compared to determine whether adding a sub-journal increases the stability ratio of the bearing system.Type: GrantFiled: March 2, 2004Date of Patent: February 24, 2009Assignee: Seagate Technology LLCInventors: Troy Michael Herndon, Jeffry Arnold LeBlanc, Robert Alan Nottingham, Mohamed Mizanur Rahman
-
Patent number: 7090401Abstract: A fluid dynamic bearing is provided having two surfaces rotatable with respect to each other, a lubricating medium located in a gap between the two surfaces during rotation of the bearing, and an interrupted and offset groove pattern formed on one of the two surfaces to distribute the lubricating medium over the surface of the bearing. The groove design is intended to be useable in either a journal, thrust or other fluid bearing design.Type: GrantFiled: April 16, 2003Date of Patent: August 15, 2006Assignee: Seagate Technology LLCInventors: Mohamed Mizanur Rahman, Gunter K. Heine, Hans L. Leuthold, Anthony Joseph Aiello
-
Patent number: 6933643Abstract: In one embodiment, a plurality of axially oriented bearings defined along gaps between rotor and stator are provided to provide radial stiffness to the system; and these bearings are coupled together by radially oriented gaps. Grooves and/or magnets may be defined in order to maintain the stability and relative spacing of the gaps, while allowing free relative rotation of parts of the system with minimum power loss. A central conical bearing may be provided, having a fluid dynamic bearing around its conical surface, and being connected to an axially parallel but radially displaced axially oriented journal style bearing. The combined effects of these bearings is sufficient to maintain or even enhance the overall stability of the system.Type: GrantFiled: January 23, 2003Date of Patent: August 23, 2005Assignee: Seagate Technology LLCInventors: Gunter K. Heine, Mohamed Mizanur Rahman
-
Patent number: 6874940Abstract: A bearing system in which an axially stiff narrow gap fluid dynamic gas bearing is preloaded by an axially less stiff larger gap fluid dynamic bearing. As an example two fluid dynamic bearings are provided spaced apart along a shaft, radially aligned with an air/gas filled spherical or conical or similar type bearing. A shaft end thrust bearing is also defined for axial support.Type: GrantFiled: April 10, 2003Date of Patent: April 5, 2005Assignee: Seagate Technology LLCInventors: Mohamed Mizanur Rahman, Gunter K. Heine
-
Patent number: 6817767Abstract: A bearing system in which an axially stiff narrow gap fluid dynamic gas bearing. As an example two fluid dynamic bearings are provided spaced apart along a shaft, one of the bearings comprising a fluid dynamic bearing, the other comprising an air bearing. The fluid dynamic bearing has a larger gap, while the air bearing has a relatively small gap. The overall working surface area of the air bearing may be twice as much or more than the working surface area of the fluid bearing.Type: GrantFiled: June 28, 2002Date of Patent: November 16, 2004Assignee: Seagate Technology LLCInventors: Michael David Kennedy, Mohamed Mizanur Rahman, Hans Leuthold
-
Publication number: 20040208403Abstract: A method of designing an improved bearing system is provided. In one embodiment, the method for designing a fluid dynamic bearing system includes determining a first stability ratio for a first journal bearing configuration. The method further includes determining a second stability ratio for a second journal bearing configuration. In one embodiment, the first configuration has two sub-journal bearings and the second configuration has three sub-journal bearings. The two stability ratios may then be compared to determine whether adding a sub-journal increases the stability ratio of the bearing system.Type: ApplicationFiled: March 2, 2004Publication date: October 21, 2004Inventors: Troy Michael Herndon, Jeffry Arnold LeBlanc, Robert Alan Nottingham, Mohamed Mizanur Rahman
-
Patent number: 6799892Abstract: A bearing system in which an axially stiff narrow gap fluid dynamic gas bearing is preloaded by an axially less stiff larger gap fluid dynamic bearing. As an example two fluid dynamic bearings are provided spaced apart along a shaft, one of the bearings comprising a fluid dynamic bearing, the other comprising an air bearing. The fluid dynamic bearing has a larger gap, while the air bearing has a relatively small gap. The overall working surface area of the air bearing may be twice as much or more than the working surface area of the fluid bearing.Type: GrantFiled: June 28, 2002Date of Patent: October 5, 2004Assignee: Seagate Technology LLCInventors: Hans Leuthold, Michael D. Kennedy, Alan Lyndon Grantz, Susan Immisch, Norbert Steve Parsoneault, Mohamed Mizanur Rahman
-
Publication number: 20040141666Abstract: A fluid dynamic bearing is provided having two surfaces rotatable with respect to each other, a lubricating medium located in a gap between the two surfaces during rotation of the bearing, and an interrupted and offset groove pattern formed on one of the two surfaces to distribute the lubricating medium over the surface of the bearing. The groove design is intended to be useable in either a journal, thrust or other fluid bearing design.Type: ApplicationFiled: April 16, 2003Publication date: July 22, 2004Inventors: Mohamed Mizanur Rahman, Gunter K. Heine, Hans L. Leuthold, Anthony Joseph Aiello
-
Publication number: 20040013330Abstract: A bearing system in which an axially stiff narrow gap fluid dynamic gas bearing is preloaded by an axially less stiff larger gap fluid dynamic bearing. As an example two fluid dynamic bearings are provided spaced apart along a shaft, radially aligned with an air/gas filled spherical or conical or similar type bearing. A shaft end thrust bearing is also defined for axial support.Type: ApplicationFiled: April 10, 2003Publication date: January 22, 2004Inventors: Mohamed Mizanur Rahman, Gunter K. Heine
-
Publication number: 20030142889Abstract: A bearing system in which an axially stiff narrow gap fluid dynamic gas bearing. As an example two fluid dynamic bearings are provided spaced apart along a shaft, one of the bearings comprising a fluid dynamic bearing, the other comprising an air bearing. The fluid dynamic bearing has a larger gap, while the air bearing has a relatively small gap. The overall working surface area of the air bearing may be twice as much or more than the working surface area of the fluid bearing.Type: ApplicationFiled: June 28, 2002Publication date: July 31, 2003Inventors: Michael David Kennedy, Mohamed Mizanur Rahman, Hans Leuthold
-
Publication number: 20030138174Abstract: A bearing system in which an axially stiff narrow gap fluid dynamic gas bearing is preloaded by an axially less stiff larger gap fluid dynamic bearing. As an example two fluid dynamic bearings are provided spaced apart along a shaft, one of the bearings comprising a fluid dynamic bearing, the other comprising an air bearing. The fluid dynamic bearing has a larger gap, while the air bearing has a relatively small gap. The overall working surface area of the air bearing may be twice as much or more than the working surface area of the fluid bearing.Type: ApplicationFiled: June 28, 2002Publication date: July 24, 2003Inventors: Hans Leuthold, Michael D. Kennedy, Alan Lyndon Grantz, Susan Immisch, Norbert Steve Parsoneault, Mohamed Mizanur Rahman
-
Patent number: 6592262Abstract: A motor is disclosed comprising a rotating shaft where the shaft comprises both an axial shaft and at least one thrust plate, both the shaft and thrust plate being supported for rotation by fluid dynamic bearings. A secondary fluid dynamic bearing is provided, coupled to the main support fluid dynamic bearing, and is oriented to provide additional axial and/or radial stiffness. Preferably, the secondary fluid dynamic bearing is defined between the sleeve which establishes the bore wherein the shaft rotates, the sleeve having an outer surface which is cylindrical and defines and includes one surface of the secondary fluid dynamic bearing, the other surface being defined by the inner surface of a hub which is coupled mechanically to the rotating shaft and thrust plate and is rotating over and around the sleeve.Type: GrantFiled: December 13, 2001Date of Patent: July 15, 2003Assignee: Seagate Technology LLCInventor: Mohamed Mizanur Rahman
-
Publication number: 20030117906Abstract: Embodiments of the invention generally provide a method for optimizing the performance of a hydrodynamic bearing used with a disc drive. In one embodiment, the invention provides a method to determine a range of dimension values associated with at least one hydrodynamic groove disposed on the hydrodynamic bearing to improve at least one or more hydrodynamic bearing performance factors. In another embodiment, the invention provides a hydrodynamic bearing having at least one cross-section dimension associated with an optimum radial stiffness for at least one hydrodynamic groove shape. In another embodiment, the invention provides a hydrodynamic bearing having at least one groove pitch ratio associated with an optimum radial stiffness for at least one hydrodynamic groove shape.Type: ApplicationFiled: March 27, 2002Publication date: June 26, 2003Inventor: Mohamed Mizanur Rahman
-
Patent number: 6583952Abstract: A hydrodynamic bearing system where the bearing includes a shaft and two independent bearings, including a top cone or bi-sphere and a bottom cone or bi-sphere separated by a segment of the shaft. The bearing includes a hub supported bearing element rotating around the shaft and the shaft supported top cone and bottom cone; complementary surfaces of the bearing element and the cone define a narrow gap between the bearing support element for the bearing fluid. Sealing plates or seal elements define a fluid gap with a radially extending face of the cone; a gap also exists between an interior surface portion of each cone and the shaft. These gaps are connected so that separate flow paths are established, one around the top cone or bi-sphere and one around the bottom cone or bi-sphere. By providing two independent bearings, the stator can be mounted to the shaft, facing magnets supported on the hub to form an in-hub motor.Type: GrantFiled: July 24, 2000Date of Patent: June 24, 2003Assignee: Seagate Technology LLCInventors: Alan Lyndon Grantz, Norbert Steven Parsoneault, Samnathan Murthy, Hans Leuthold, Mohamed Mizanur Rahman
-
Publication number: 20020191873Abstract: A motor is disclosed comprising a rotating shaft where the shaft comprises both an axial shaft and at least one thrust plate, both the shaft and thrust plate being supported for rotation by fluid dynamic bearings. A secondary fluid dynamic bearing is provided, coupled to the main support fluid dynamic bearing, and is oriented to provide additional axial and/or radial stiffness. Preferably, the secondary fluid dynamic bearing is defined between the sleeve which establishes the bore wherein the shaft rotates, the sleeve having an outer surface which is cylindrical and defines and includes one surface of the secondary fluid dynamic bearing, the other surface being defined by the inner surface of a hub which is coupled mechanically to the rotating shaft and thrust plate and is rotating over and around the sleeve.Type: ApplicationFiled: December 13, 2001Publication date: December 19, 2002Inventor: Mohamed Mizanur Rahman
-
Patent number: 6473271Abstract: A disc drive actuator arm is an extended arm having forward edge to engage fluid flow due to rotation of the disc, a rear edge, and a top surface and a bottom surface along which fluid flows. The top and bottom surfaces join the forward and rear edges, and the fluid flow has a boundary layer along the top surface and the bottom surface. The arm has an aerodynamic cross-section so that the fluid flow boundary layer does not separate at the forward and rear edges. The fluid flow past the arm from the forward edge to the rear edge is substantially laminar to prevent vortex shedding.Type: GrantFiled: June 9, 2000Date of Patent: October 29, 2002Assignee: Seagate Technology LLCInventors: Mohamed Mizanur Rahman, Hans Leuthold
-
Patent number: 6292328Abstract: 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.Type: GrantFiled: March 27, 2000Date of Patent: September 18, 2001Assignee: Seagate Technology LLCInventors: Mohamed Mizanur Rahman, Gunter Karl Heine, Hans Leuthold, Raquib Uddin Khan
-
Patent number: 6154339Abstract: An improved capillary seal for use with a hydrodynamic bearing is disclosed, which provides a stronger or stiffer seal for a fluid dynamic bearing motor which is open at both ends, and is used with top cover attached motors utilizing fluid dynamic bearings. The design of the capillary seal uses centrifuigal force to actively push the oil back into the FDB while it is spinning, combined with the capillary tension which holds oil in the FDB during stationary periods. Also, the seal design comprises two walls which converge toward an apex near an adjacent fluid dynamic bearing. This design allows air, trapped within the seal and the associated FDB, to be expelled, eliminating air bubbles from the fluid dynamic bearing.Type: GrantFiled: April 14, 1998Date of Patent: November 28, 2000Assignee: Seagate Technology LLC.Inventors: Alan Lyndon Grantz, Mohamed Mizanur Rahman
-
Patent number: 6144523Abstract: A hydrodynamic bearing useful as a bearing cartridge or as the cartridge may be incorporated into a spindle motor or the like, where the bearing includes a stationary shaft and two independent bearings, comprising a top cone and a bottom cone separated by a segment of the shaft. The bearing includes a sleeve rotating around and surrounding the shaft, and the top cone and bottom cone and defining a narrow gap between the sleeve and the shaft and cones. Sealing plates are supported on the sleeve to seal off the ends of the bearing and are located along the shaft beyond the cones. A gap also exists between an interior surface portion of each cone and the shaft. Thus, separate flow paths are established, one around the top cone and one around the bottom cone. By providing two independent paths, the flow rates do not have to be the same in each conical flow path for the bearing seals to function properly.Type: GrantFiled: December 19, 1997Date of Patent: November 7, 2000Assignee: Seagate Technology LLCInventors: Samnathan Murthy, Alan Lyndon Grantz, Steve Parsoneault, Roger Allen Addy, Peter R. Riegler, Mohamed Mizanur Rahman