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| Number | Title | Issue Date |
| 7726881 | Hydrodynamic bearing device A hydrodynamic bearing device is provided for use with a spindle motor. The hydrodynamic bearing device has a sleeve made of a sintered metal that is obtained by sintering a sintering material that is iron, an iron alloy, copper, a copper alloy or a mixture thereof.... | 06/01/2010 |
| 7507039 | Dynamic pressure bearing manufacturing method, dynamic pressure bearing and dynamic pressure bearing manufacturing device A dynamic pressure bearing manufacturing method, comprising the steps of forming a herringbone groove pattern on the outer peripheral surface of a cylindrical mask and a spiral groove pattern on the lower surface of the flange part thereof, inserting the mask in a d... | 03/24/2009 |
| 7438476 | Hydraulic dynamic bearing and spindle motor A hydraulic dynamic bearing has a rotor comprised of a flanged shaft having a thrust ring portion and a cylinder portion, a hub attached to the flanged shaft, and a rotor magnet attached to an inner peripheral face of a skirt portion of the hub. A stator rotatably s... | 10/21/2008 |
| 7435003 | Fluid dynamic bearing unit A flange on a shaft of a fluid dynamic bearing unit is to be provided with a hole connecting an outer periphery of the flange and an outer periphery of the shaft. A radial groove is provided on a surface of two flange half pieces, and a vertical groove communicating... | 10/14/2008 |
| 7422371 | Active hybrid FDB motor An active fluid bearing system is provided. In one example, the active fluid bearing system includes an interface region formed between an outer surface of an inner member and an opposing inner surface of an outer member. The inner and outer members are disposed for... | 09/09/2008 |
| 7401980 | Axial bearing A thrust bearing, in particular for a turbo charger, has an essentially disc shaped bearing body (10) with a central through opening (12) for a shaft, at least one bearing surface (14) surrounding the through opening (12) for a collar whi... | 07/22/2008 |
| 7374340 | Fluid dynamic-pressure bearing, spindle motor and recording disk driving device A fluid dynamic-pressure bearing includes a thrust dynamic-pressure bearing between a bearing member and a rotor hub and a tapered sealing portion continuous with the thrust dynamic-pressure bearing and defining a radial gap whose width gradually increases in the ax... | 05/20/2008 |
| 7371010 | Hydrodynamic bearing device and compact motor including hydrodynamic bearing device A shaft is rotatably inserted through a bearing hole of a sleeve, a screw hole for fastening a clamp to the shaft is formed along a direction of an axis from an upper end portion of the shaft, an operating fluid is charged in a gap between an inner peripheral surfac... | 05/13/2008 |
| 7367429 | Device for feeding oil to a bearing seat of a rotatable shaft A device for feeding oil to a seat of a bearing (5) that supports a rotatable shaft (3) includes an annular oil reservoir (14) surrounding a seat of the bearing (5), an oil pump (8) having two spindles (10, 11) with opposite... | 05/06/2008 |
| 7345392 | Spindle motor having a hydrodynamic bearing system The invention relates to a spindle motor having a hydrodynamic bearing system, particularly to drive platters in a hard disk drive, the platters being disposed on a rotor, and the bearing system being formed by a bearing sleeve arranged on a baseplate and a shaft ro... | 03/18/2008 |
| 7318674 | Single thrust bearing fluid dynamic bearing motor A typical dynamic bearing design comprises a ring shaped or circular thrust plate mounted at or near the end of a shaft, the shaft defining together with a surrounding sleeve a journal bearing by providing grooves on only one of the two surfaces facing the gap betwe... | 01/15/2008 |
| 7317271 | Fluid bearing motor, and disk drive mounted with same The stop ring having a surface nearly vertical to the rotational center axis, which is projected at the inner periphery of the hollow cylinder of the rotor section, and the stepped surface of the fixed shaft secured on the chassis are opposed to each other with a pr... | 01/08/2008 |
| 7309937 | Spindle motor of a small-scale design The spindle motor described herein comprises a rotor having a rotor hub and a shaft connected to the rotor hub, a cylindrical bearing sleeve having a central bore to accommodate the shaft and a collar disposed at the receiving aperture, a cup-shaped bearing housing ... | 12/18/2007 |
| 7300209 | Aerodynamic bearing assembly for spindle motor for hard disk drives Disclosed is an aerodynamic bearing assembly for a spindle motor for hard disk drives, in which a hub of the spindle motor is pivoted in both radial and thrust directions by the ball bearing, which directly contacts the center of the hub, to perform rotation accordi... | 11/27/2007 |
| 7294946 | Motor using dynamic gas bearings A dynamic pressure gas bearing motor in which a radial dynamic pressure gas bearing and a thrust dynamic pressure gas bearing are ensured to have sufficient length and diameter even though the clamping screw holes for introducing screws to reliably hold a disk are f... | 11/13/2007 |
| 7290934 | Fluid dynamic-pressure bearing device and spindle motor Small-size, small-height fluid dynamic-pressure bearing device that causes a low shaft loss and is less prone to troubles such as shortage and leakage of lubricating liquid. A thrust dynamic-pressure bearing is formed at an inner position and a region having a sligh... | 11/06/2007 |
| 7284909 | Hybrid orbital fluid dynamic bearing motor Hybrid orbital fluid dynamic bearing motors are disclosed. The motors achieve improved efficiency advantages observed in fluid dynamic bearing motors containing an orbital ring. In addition, the hybrid orbital FDB motor has serial thrust bearings and traditional sty... | 10/23/2007 |
| 7281852 | Spool bearing with asymmetric sealing A spindle motor is provided comprising a fixed shaft capable of being fastened at either end to the base and cover of the disc drive. The hub which rotates around the disc drive is supported for rotation by a journal bearing and thrust bearing, with the thrust beari... | 10/16/2007 |
| 7267484 | Fluid bearing device The preset invention aims to improve the assembly accuracy and rotation accuracy of a fluid bearing device, and to further reduce the cost thereof. A bearing sleeve is fixed on the inner periphery of a housing. An axial member is supported in a non-contact manner in... | 09/11/2007 |
| 7246945 | Oil dynamic bearing, motor supported on oil dynamic bearing and disk drive carrying the motor An oil dynamic bearing, a motor and a disk drive adapted to be reduced in both size and thickness are disclosed. The oil dynamic bearing (B) includes at least two bearing portions (B1, B2), each having a bearing near end nearer to the rotational axis o... | 07/24/2007 |
| 7241051 | Radial capillary seal for fluid dynamic bearing motors A seal with a primary axis lying in the radial direction so that the fluid bearing is primarily extending in the axial direction between the rotating shaft and surrounding sleeve is disclosed. The capillary seal is positioned with an opening adjacent an end of the f... | 07/10/2007 |
| 7234868 | Radial pumping oil seal for fluid dynamic bearing motor An improved rotational motor, such as a spindle motor for a disc drive, is provided. The motor first comprises a hub having a shaft portion and a horizontal body portion. The motor also comprises a sleeve surrounding the shaft portion of the hub. A fine first vertic... | 06/26/2007 |
| 7222861 | Sealing in a hydraulic turbine unit System for providing sealing between a rotor and a turbine casing in a hydraulic turbomachine includes a sealing ring arranged in a peripheral region of the rotor. The sealing ring forms at least one hydrostatic bearing with respect to at least one of the rotor and ... | 05/29/2007 |
| 7220054 | Dynamic pressure bearing apparatus A dynamic bearing apparatus which supports a shaft and a bearing so as to be capable of relative rotation by a dynamic pressure of a lubricating fluid. A bottomed screw hole (21a) is provided to at least one end of the shaft (21) to screw a head... | 05/22/2007 |
| 7201517 | Hydrodynamic bearing device and a recording disk drive equipped with it A hydrodynamic bearing device comprises a shaft bush having a substantially conical inclined dynamic pressure surface around the outer circumference thereof which is relatively rotatably inserted in a bearing sleeve having a substantially conical inclined dynamic pr... | 04/10/2007 |
| 7201516 | Fluid bearing device A fluid bearing device capable of preventing a lubricant from scattering outward even during rotation thereof, while holding a relatively large amount of lubricant at a seal surface portion. A lubricant is filled between a sleeve and a shaft, a seal surface portion ... | 04/10/2007 |
| 7196868 | Hydrodynamic bearing and disk recording/reproducing apparatus having a vent inside a fixed shaft Radial dynamic pressure grooves are provided in a first region 4A and a second region 4B on the side of a fixed shaft 2. A vent 2D is provided inside the top end 2A of the fixed shaft 2. The vent 2D connects spaces ov... | 03/27/2007 |
| 7178983 | Spindle motor and magnetic disk drive A rotational member and a stationary member included in a spindle motor provided with air bearings are electrically connected while the bearing is rotating, and abrasion of the rotational member and the stationary member at stages of starting and stopping and damagi... | 02/20/2007 |
| 7160031 | Thrust dynamic pressure bearing, spindle motor using the same, and information recording and reproducing apparatus using them In order to prevent lubricating oil leakage due to bubbles in a thrust dynamic pressure bearing having herringbone grooves, and to stabilize the bearing performance, and enhance the reliability and durability, auxiliary grooves deeper than pump-in type herringbone g... | 01/09/2007 |
| 7158330 | Method and apparatus for servo track writing by track following on a dedicated servo disk on a fluid spindle bearing What is disclosed is a method and apparatus for writing servo information on disks to be used in a hard disk drive assembly. In one embodiment, servo information is pre-written onto a disk using an offline servo track writer which employs a fluid dynamic bearing spi... | 01/02/2007 |
| 7133250 | Inboard thrust surface fluid recirculation pump An inboard thrust surface is provided for a spindle motor that maintains fluid flow through a journal bearing and generates an added offset pressure to avoid any subambient pressure within a journal. In an aspect, journal bearing asymmetry is minimized or eliminated... | 11/07/2006 |
| 7128468 | Hydrodynamic bearing, method of manufacturing the same, method of manufacturing shaft member for hydrodynamic bearing, spindle motor, and recording disk driving apparatus According to the invention, a shaft as a component of a shaft member of a hydrodynamic bearing and a disc member such as a thrust plate are joined to each other by welding by a simple method with high precision. A shaft having a cylindrical outer circumferential sur... | 10/31/2006 |
| 7125169 | Hydrodynamic pivot bearing 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. ... | 10/24/2006 |
| 7121725 | Fluid dynamic bearing lubricant air extraction device The fluid dynamic bearings system of the invention provides a device located in a non-grooved low pressure region located at some point in the overall fluid circulation path of the fluid dynamic bearing to collect and trap any air bubbles which may be found in the f... | 10/17/2006 |
| 7101084 | Dynamic pressure bearing device A dynamic bearing apparatus which supports a shaft and a bearing so as to be capable of relative rotation by a dynamic pressure of a lubricating fluid. A bottomed screw hole (21a) is provided to at least one end of the shaft (21) to screw a head... | 09/05/2006 |
| 7097360 | Hydrodynamic bearing for a spindle motor A hydrodynamic bearing for use in a spindle motor, having a shaft, a bearing sleeve encompassing the shaft with a small radial space, and a skewback at one end face of the bearing sleeve which is fixedly connected to the bearing sleeve. The shaft features a thrust p... | 08/29/2006 |
| 7090401 | Grooving pattern for grooved fluid bearing 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 surface... | 08/15/2006 |
| 7056026 | Capillary seal with fill pool Improved capillary sealing is provided for withstanding shock events, vibration and evaporation, for use with fluid dynamic bearings. In an aspect, minimal axial space is occupied by a fluid reservoir and the sealing system and method withstands at least 1000 G shoc... | 06/06/2006 |
| 7044644 | Electrically conducting ceramic bearings Electrically conducting ceramic bearings are described. All components of these bearings preferably comprise TSC, and may not require any conductive coating, or any lubricating coating. These bearings may comprise at least one rolling element such as a bearing ball,... | 05/16/2006 |
| 7042125 | Hydraulic fluid dynamic bearing incorporating an asymmetric journal bearing A fluid bearing design is provided which according to one aspect includes a shaft defining together with a surrounding sleeve an asymmetric journal bearing, and a thrust bearing at or near an end of the shaft towards which the asymmetric journal bearing is pumping, ... | 05/09/2006 |
