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| Number | Title | Issue Date |
| 8366322 | Shaft member for fluid dynamic bearing device A shaft member for a fluid dynamic bearing device that has a recess to cause a dynamic pressure effect of a fluid in a bearing clearance, which is formed on it by rolling, and where a surface layer portion of the recess and a surface layer portion of a surrounding r... | 02/05/2013 |
| 7699529 | Fluid dynamic bearing having pressure-generating surface patterns A fluid dynamic bearing system having pressure-generating asymmetric surface patterns, having at least two bearing parts that are rotatable with respect to each other and form a bearing gap filled with a bearing fluid between associated bearing surfaces. The surface... | 04/20/2010 |
| 7411762 | Fluid dynamic pressure bearing including dynamic pressure generating grooves, and spindle motor and disc drive including the bearing In a fluid dynamic pressure bearing, upper herringbone grooves and lower herringbone grooves continuous with the upper herringbone grooves are formed on the inner peripheral surface of a sleeve by plastic deformation. In addition, an annular groove recessed radially... | 08/12/2008 |
| 7302790 | Adjustable spindle assembly for a grass trimmer An adjustable spindle assembly comprising a spindle housing, a keyed spindle shaft rotatably connected to the spindle housing, a mow ball rotatably connected to one end of the keyed spindle shaft, and a string carrier assembly adjustably connected in between the spi... | 12/04/2007 |
| 7288860 | Magnetic transducer with ferrofluid end bearings An electrical generator includes one or more magnets that move relative to one or more conductors to generate an electrical signal in each conductor. Each magnet has ferrofluid bearings in the vicinity of its opposite ends to provide a low friction interface between... | 10/30/2007 |
| 7284910 | Capillary seal with flow restrictors A disk drive motor having a capillary bearing seal is provided. In one embodiment, a disk drive motor includes a stationary assembly and a rotating assembly having a fluid dynamic journal bearing disposed therebetween. A capillary seal is defined proximate an upper ... | 10/23/2007 |
| 7258487 | Bearing unit, and motor and electronic apparatus having the bearing unit The bearing unit of the present invention has: a shaft; a radial bearing which supports the shaft in a circumferential direction of the shaft; a thrust bearing which supports an end of the shaft in a thrust direction of the shaft; a housing having a closed structure... | 08/21/2007 |
| 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 |
| 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 |
| 7235168 | Method for electrochemically forming a hydrodynamic bearing surface A method of forming a hydrodynamic bearing surface on a workpiece is provided. The method comprises electrochemically etching away all material in a region of the surface, except for portions of the region defined by a land pattern on an etching cathode. The step of... | 06/26/2007 |
| 7229214 | Fluid dynamic bearing unit A fluid dynamic bearing unit includes a bearing housing (20) axially defining therein a bearing hole (21), a rotary shaft rotatably received in the bearing hole with a radial space formed between the rotary shaft and the bearing housing, and lubricant ... | 06/12/2007 |
| 7226211 | Shaft for fluid dynamic bearing, fluid dynamic bearing device, and method of manufacturing the shaft In a method of manufacturing a shaft for the fluid dynamic bearing device, the shaft is formed with a plurality of grooves arranged in and around the external circumference, the surface of the grooves and external circumference with uniform roughness, and machined m... | 06/05/2007 |
| 7165889 | Bearing oil lift pocket An oil lift pocket for a bearing surface having a plurality of channels in communication with a supply port. The plurality of channels may be formed in a substantially bow shaped configuration. Each channel may extend from a supply port and terminate at an end and a... | 01/23/2007 |
| 7160622 | Oil repelling agent An oil repelling agent to coat a dynamic pressure device, such as a fluid dynamic pressure bearing device, includes a UV coloring agent, a fluorine-based polymer and a solvent. In an exemplary embodiment of the invention, the concentration of the UV coloring agent c... | 01/09/2007 |
| 7144932 | Low-friction, high-dispersion synthetic resin composition containing fine particles of RB ceramic or CRB ceramic and a method for its preparation A synthetic resin composition includes at least one synthetic resin and RBC or CRBC particles dispersed in the resin. A method for preparing a synthetic resin composition includes mixing RBC or CRBC particles with a synthetic resin at a temperature near the melting ... | 12/05/2006 |
| 7140777 | Hydrodynamic bearing assembly A hydrodynamic bearing assembly comprises a bearing (10) defining a bearing hole (12) therein, a shaft (20) rotatably received in the bearing hole with a bearing clearance formed between a bearing surface of the bearing and an outer surface of t... | 11/28/2006 |
| 7134791 | Dynamic pressure bearing device, spindle motor, disk drive device, and method of manufacturing dynamic pressure bearing device A dynamic pressure bearing device and a spindle motor used for a magnetic disk drive device capable of increasing an impact resistance, reducing A-PRO (oscillating motion of shaft), reducing a variation in rigidity of bearings against a variation in temperature, sup... | 11/14/2006 |
| 7125170 | Fluid dynamic bearing motor Provided is a fluid dynamic bearing motor in which a rotor is rotatably supported by forming an oil gap between the rotor and a stator to form a fluid dynamic pressure bearing and a plurality of oil grooves are formed in a surface of the rotor or stator forming the ... | 10/24/2006 |
| 7088019 | Air bearing for MEMS based motor A MEMS (micro-electromechanical system) device having a rotor 44, a stator 43 and a shaft 27 connected to the stator 43 and around which the rotor 44 rotates. Grooves 47 are formed in a portion of the rotor 44, such t... | 08/08/2006 |
| 7059106 | Adjustable spindle assembly for a grass trimmer An adjustable spindle assembly is described and includes a spindle housing, a grooved spindle shaft rotatably connected to the spindle housing, a pulley connected to one end of the grooved spindle shaft, a mow ball rotatably connected to a second end of the grooved ... | 06/13/2006 |
| 7059052 | Hydrodynamic type porous oil-impregnated bearing The porous oil-impregnated bearing 1 comprises a bearing body 1a made of a porous material, and oil retained in the pores of the bearing body 1a by impregnation with lubricating oil or lubricating grease. The inner peripheral surfa... | 06/13/2006 |
| 7056024 | Through hub oil fill and vent for a fluid dynamic bearing motor A through hub fill hole and air vent having an enlarged fluid diffusion path is provided for spindle motors. Oil leakage and evaporation from a motor is reduced. In an aspect, oil is retained under conditions of at least a 1000 G shock event. In an aspect, the hub f... | 06/06/2006 |
| 6979923 | Motor having dynamic pressure fluid bearing and disc drive apparatus provided with the motor A motor (100) having a dynamic pressure fluid bearing is composed of a hub (2), a rotor (4) provided with a shaft (7) of which one end portion is securely fastened by the hub (2) and another end portion is formed with a flange (... | 12/27/2005 |
| 6974257 | Dynamic pressure bearing A dynamic pressure bearing is provided in which required performances such as corrosion resistance and wear resistance in the use of a hard disk drive or the like are realized without application of any coating such as Ni plating that easily causes a failure, thereb... | 12/13/2005 |
| 6955472 | Lubricant reservoir for gas bearing A method and apparatus is provided for allowing a molecularly thin film to be established on a surface of the gas fluid dynamic bearing. The film can be controllably replenished so that the problem of liquid lubricant starvation is overcome. A suitable non-sludging ... | 10/18/2005 |
| RE38791 | Sliding bearing A helically continuous projection 1a is formed around a sliding surface 1A of a sliding bearing 1 at a given pitch p. The surface roughness h of the sliding surface 1A, including the projection 1a, is chosen to be equ... | 09/06/2005 |
| 6935786 | Hydraulic bearing A hydraulic bearing that supports a rotating shaft comprises a bearing metal. On a surface of the bearing metal, a hydrostatic pocket and a land portion are formed. The land portion is defined by the hydrostatic pocket and generates hydrodynamic pressure in response... | 08/30/2005 |
| 6933959 | Optical scanning device and image forming apparatus An optical box for positioning and fixing respective optical components is provided and functions as a housing thereof. A support stand for positioning and mounting the respective optical components, respectively, is formed separately from the optical box, and is lo... | 08/23/2005 |
| 6917131 | Transverse mechanical translator with ferrofluid support A mechanical translator includes at least one magnet that is disposed on a substrate to carry a load and has a magnetic axis generally transverse to the substrate, establishing a magnetic field with maximum external density adjacent the substrate. An ultra low frict... | 07/12/2005 |
| 6851861 | Lubricant retention design for disk drive fluid dynamic bearing spindle motor A lubricant retention design for a fluid dynamic bearing design in a spindle motor utilizes a labyrinth gap that is formed between the sleeve and the shaft of the bearing. The gap is used in conjunction with a barrier film to impede the flow of lubricant into the la... | 02/08/2005 |
| 6776529 | Antiwear lubrication coating for bearing surfaces for hydrodynamic fluid bearings A very thin lubricant coating is applied to one or both of the facing surfaces defining the gap of a hydrodynamic bearing to prevent wear of these surfaces. The lubricant film is necessarily very thin, in the range of about 10 Å to 1000 Å, so that the film is th... | 08/17/2004 |
| 6765326 | Cooling device motor having a hydrodynamic bearing with a unitary shaft thrust supporter A motor and a cooling device include (a) a frame with an opening, (b) a frame-housing provided on the frame and having one open side, (c) a stator mounted on an outer wall of the frame-housing, (d) a sleeve fit into the frame-housing, (e) a thrust supporter formed u... | 07/20/2004 |
| 6702464 | Dynamic pressure bearing with improved starting characteristics A hydrodynamic bearing assembly with improved activation features is provided. The opposing surfaces in the radial and thrust bearings have grooves 2 and 5 with depths shallower gradually towards the downstream flow of the fluid passing therethrough, for ... | 03/09/2004 |
| 6428211 | Hydrodynamic gas bearing structure A hydrodynamic gas bearing structure includes a columnar shaft body (1) and a hollow cylindrical bearing body (2) arranged opposing the shaft body (1) with a space (3) maintained in the radial direction therebetween. In a cross section perpendicular to th... | 08/06/2002 |
| 6400052 | Motor and rotary apparatus having motor A motor has a support member, a bearing member mounted in a hollow space of the support member for undergoing rotation, a rotor member having a shaft portion disposed in a hollow space of the bearing member for rotation therewith, at least one magnet conn... | 06/04/2002 |
| 6378209 | Method of producing fluid bearing device In a dynamic pressure bearing device which has a shaft (3), a bearing (10) rotatable relative to the shaft (3), and capillary seal portions (13, 14) for holding a lubricating fluid (15) in a bearing clearance and in which the shaft (3) and the bearing (10... | 04/30/2002 |
| 6371650 | Hydraulic dynamic bearing and spindle motor and rotary assembly provided A double sleeve type dynamic bearing comprises a fixed shaft having at least one end fixedly mountable to an apparatus in which the bearing is utilized, a rotary sleeve arranged coaxially with the fixed shaft so that a first fine gap is formed therebetwee... | 04/16/2002 |
| 6361214 | Hydrodynamic-pressure bearing device and motor provided with the hydrodynamic-pressure bearing device Spindle motor hydrodynamic pressure bearing device having upper and lower radial bearing portions axially separated by an air space, established in the micro-gap between the outer circumferential surface of the motor shaft and the inner circumferential su... | 03/26/2002 |
| 6341896 | Hydrodynamic bearing and method of manufacturing the same A shaft member 21 the flexible, austenitic stainless steel is cold worked, and in the cold working process, a cold working ratio is increased, whereby a surface of the shaft member 21 is hardened. Therefore, there is no need for a nitriding treatment for ... | 01/29/2002 |
| 6338574 | Bearing mechanism, hard disk drive mechanism and polygon mirror drive mechanism using the bearing mechanism, and method for manufacturing herringbone groove portions of dynamic-pressure bearing A bearing mechanism eliminates the need for lubricating oil, is capable of generating enough radial dynamic pressure even in lower-speed regions, and yet can be easily surface-machined for the generation of radial dynamic pressure and manufactured with lo... | 01/15/2002 |
