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| Number | Title | Issue Date |
| 8157447 | Groove configuration for a fluid dynamic bearing A groove configuration that improves angular stiffness in a fluid dynamic bearing is provided. A primary groove and a secondary groove are formed on a journal bearing or thrust bearing surface. The secondary groove apex induces a heightened pressure response at a lo... | 04/17/2012 |
| 7946770 | Hydrodynamic bearing device A hydrodynamic bearing device has favorable bearing performance and long endurance life. A thrust bearing part of the hydrodynamic bearing device has a second thrust surface. In the second thrust surface, a dynamic pressure generating groove area having a plurality ... | 05/24/2011 |
| 7540664 | Grooves on both the moving and the stationary mating fluid dynamic bearing surfaces for performance enhancement A fluid dynamic bearing is provided having a first surface having at least a first groove pattern formed therein; and the second surface having at least a second groove pattern formed therein; wherein one of the surfaces is configured to be rotated relative to the o... | 06/02/2009 |
| 7524113 | Hydrodynamic bearing device A hydrodynamic bearing device which can improve reliability by stabilizing a balance of dynamic pressures generated at a thrust bearing portion. The spindle motor 1 includes a hydrodynamic bearing device 4 including a shaft 41, a sleeve 42 | 04/28/2009 |
| 7448805 | Thrust dynamic pressure bearing, spindle motor using thereof, and information recording/reproducing device using the spindle motor A thrust dynamic pressure bearing with high inclination-resistant rigidity against axis runout and additionally low bearing loss torque is implemented. Herringbone grooves (131) having intermediate bends (132) are provided on rotating-side bearing surf... | 11/11/2008 |
| 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 |
| 7384104 | Oscillating disc cutter with speed controlling bearings An oscillating disc cutter including a cutting disc and a drive mechanism. The drive mechanism includes a drive shaft to effect eccentric oscillation of the cutting disc and a radial bearing disposed to permit relative rotation between the drive shaft and the cuttin... | 06/10/2008 |
| 7293917 | Spindle motor having hydrodynamic pressure bearing A spindle motor having a hydrodynamic pressure bearing includes a stator, a rotor, and a dynamic pressure generating unit including a sleeve having an upper plate disposed opposite to the rotor and at least one thrust dynamic pressure groove formed either at the upp... | 11/13/2007 |
| 7267028 | Stacked disc flywheel A high-speed steel flywheel for a flywheel uninterruptible power is constructed by stacking several unpierced steel discs together. Each disc is heat treated prior to assembly. Thin axial thickness of each disc enables complete rapid quenching to attain a fully hard... | 09/11/2007 |
| 7243626 | Camshaft adjuster A device for changing the control times of an internal combustion engine (camshaft adjuster (1)) having a pressure medium distributor (21) arranged within a camshaft (11) is provided. The pressure medium distributor (21) is provided at it... | 07/17/2007 |
| 7237956 | Hydrodynamic bearing and disc rotation apparatus using the same A high-accuracy, long-life hydrodynamic bearing that does not cause oil film breakage in bearing clearances and a disc rotation apparatus using the bearing is disclosed. Oil film breakage is avoided as negative pressure is prevented from generating between the shaft... | 07/03/2007 |
| 7237955 | Hydrodynamic bearing and disc rotation apparatus using the same A high-accuracy, long-life hydrodynamic bearing that does not cause oil film breakage in bearing clearances and a disc rotation apparatus using the bearing is disclosed. Oil film breakage is avoided as negative pressure is prevented from generating between the shaft... | 07/03/2007 |
| 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 |
| 7189003 | Turbomachine A turbomachine has a rotor shaft, which is mounted in a bearing arrangement containing a hydrodynamic axial bearing, and a rotor disposed on the rotor shaft. A hydrostatic axial bearing is additionally provided in the immediate vicinity of the hydrodynamic axial bea... | 03/13/2007 |
| 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 |
| 7146733 | Dynamic bearing device and method for making same The thrust member is inserted into the inner circumferential surface of the housing, to make the end face of the thrust member contact with the lower side end face of the flange portion, and at the same time, to make the upper side end face of the flange portion con... | 12/12/2006 |
| 7134793 | Thrust bearing assembly The subject invention provides a thrust bearing assembly having only three thrust flanges in total. One portion of the thrust bearing assembly comprises a main bearing having an arcuate bearing shell with a concave inner surface and a convex outer surface. A thrust ... | 11/14/2006 |
| 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 |
| 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 |
| 7080720 | Torque converter An improved torque converter that results in greater fuel efficiency and more horsepower with a lower failure rate. The improved torque converter has a greater lock-up surface area than an original equipment torque converter to reduce slippage. The lock-up surface a... | 07/25/2006 |
| 7008110 | 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. ... | 03/07/2006 |
| 7001073 | Hydrodynamic bearing for a spindle motor Hydrodynamic bearing for use in a spindle motor includes a shaft, a bearing sleeve encompassing the shaft with a small radial clearance, a plurality of hydrodynamic pressure generating grooves formed on at least one of an outer surface of the shaft and an inner surf... | 02/21/2006 |
| 7001074 | High pressure barrier to oil loss by diffusion 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 vertical gap... | 02/21/2006 |
| 6976788 | Thrust bearing In a thrust bearing supporting a load in a thrust direction in a rotary portion, a size of a curved surface in the forward side of a lubricating groove with respect to a relative rotating direction of an opposing sliding member is set to be larger than a size of a c... | 12/20/2005 |
| 6962443 | Fluid dynamic pressure bearing apparatus A fluid dynamic pressure bearing apparatus includes a radial dynamic pressure bearing formed in a gap portion between a bearing member and a shaft member. The apparatus also includes a thrust dynamic pressure bearing having a first thrust bearing portion formed betw... | 11/08/2005 |
| 6957917 | Hydrodynamic axial slide bearing for a generator Hydrodynamic plane thrust bearing (26) for a generator (10), preferably operable with a water turbine, with a rotor (12), a track ring (30) rotating with the shaft (20) of the rotor (12), and a bearing segment (32) no... | 10/25/2005 |
| 6955469 | Dynamic pressure bearing device A dynamic pressure bearing device includes a dynamic pressure bearing member, a rotary member that is rotatable with respect to the dynamic pressure bearing member, a thrust dynamic pressure bearing section provided in a thrust opposing region that is between an end... | 10/18/2005 |
| 6951025 | Gas dynamic pressure bearing, spindle motor comprising a gas dynamic pressure bearing, and recording disk drive device and polygon scanner comprising a spindle motor A gas dynamic pressure bearing is disclosed in which dynamic pressure generating grooves in a radial bearing pump out gas toward a thrust bearing, and dynamic pressure generating grooves in the thrust bearing pump in gas toward the radial bearings. This structure ge... | 09/27/2005 |
| 6945697 | Dynamic gas bearing of a motor spindle comprising aeration The invention relates to a dynamic gas mounting of a motor spindle, with a rotating shaft 2 which is gas-mounted in a housing 3 in the radial and axial direction, at least one radial gas bearing 4 being present for radial mounting along the shaf... | 09/20/2005 |
| 6945696 | Hydrodynamic thrust bearing A hydrodynamic thrust bearing, particularly forming a part of a bearing system for a rotary bearing of spindle motors utilized to power hard disk drives. The thrust bearing includes at least one annular thrust plate and a counter bearing corresponding to the thrust ... | 09/20/2005 |
| 6939048 | Hydrodynamic thrust bearing A hydrodynamic thrust bearing, forming a part of a bearing system for a rotary bearing of spindle motors utilized to power hard disk drives, which includes at least one annular thrust plate and a counter bearing corresponding to the thrust plate. The thrust plate is... | 09/06/2005 |
| 6921210 | Flange bearing An engine bearing for an internal combustion engine has a pair of separately constructed bearing halves comprising a pair of arcuate shells having a pair of laterally spaced flanges extending generally radially outwardly from each shell. Each pair of laterally space... | 07/26/2005 |
| 6921996 | Constant pressure magnetically preloaded FDB motor The shaft may be supported for rotation by a conical bearing rotating within a sleeve. To prevent misalignment of the rotor and stator as the motor heats up and fluid viscosity changes, a magnetic preload is established; in a preferred embodiment, the magnetic prelo... | 07/26/2005 |
| 6914358 | Spindle motor and disk drive furnished therewith In a spindle motor utilizing dynamic-pressure bearings having a full-fill structure, a bearing configuration that balances and sustains at or above atmospheric pressure the internal pressure of the bearing oil. Thrust and radial bearing sections are configured withi... | 07/05/2005 |
| 6838795 | Low velocity, high pressure thrust pump A fluid dynamic bearing motor is provided comprising a base, a counter plate fixed to the base, a stationary sleeve fixed to the base and supported on the counter plate, a rotating shaft axially disposed through the sleeve, and a fluid dynamic bearing disposed betwe... | 01/04/2005 |
| 6831812 | Method of manufacturing a thrust plate, method of manufacturing a shaft for a hydrodynamic bearing, hydrodynamic bearing, spindle moto A method of manufacturing a thrust plate for a dynamic pressure bearing in which the upper and lower end surfaces thereof have a highly precise perpendicular angle relative to the central axis thereof. The thrust plate has an annular shape, and a central hole is for... | 12/14/2004 |
| 6827494 | Diverted flow thrust bearing A hydrodynamic thrust bearing of this invention comprises a body having a load-bearing surface comprising an oil supply channel and an oil return channel positioned along respective inside and outside body diameters. A number of thrust pads are positioned along the ... | 12/07/2004 |
| 6793394 | Hydrodynamic bearing device A pair of thrust hydrodynamic bearing portions are made to communicate with each other to form fluid circulating passages for equalizing a pressure imbalance between both thrust hydrodynamic bearing portions. Even in a case where a pressure imbalance has occurred in... | 09/21/2004 |
| 6722785 | Fluid dynamic bearing A fluid dynamic bearing has a shaft (11) fitted in a sleeve (12) for rotation, with a fluid filled therebetween. The shaft (11) and/or sleeve (12) is formed with a pattern consisting of grooves (111g) and lands for generatin... | 04/20/2004 |
