Class / Patent application number | Description | Number of patent applications / Date published |
384112000 |
Grooved thrust bearing surface
| 32 |
384108000 |
Spherical | 5 |
20100142868 | Gas journal bearing systems and related methods - Gas journal bearing systems are provided. An exemplary gas journal bearing system comprises a vortex generator, a housing and a journal. The vortex generator is operative to receive a flow of gas and to impart an angular acceleration to the gas. The housing is in fluid communication with the vortex generator, with housing having a first exhaust through which the gas is exhausted. The journal is supported within the housing by a vortex of the gas as the gas swirls along at least a portion of a length of the journal. Methods and other systems also are provided. | 06-10-2010 |
20090245704 | SEALED SPHERICAL BEARING DEVICE - The present invention describes methods and apparatus to improve the operation of, and reduce the maintenance required by, a spherical bearing. An exemplary embodiment of the present invention provides a sealed spherical bearing device including a spherical bearing and a flexible shield surrounding a portion of the spherical bearing enabled to articulate in accordance with a rotary motion of the spherical bearing and an oscillatory motion of the spherical bearing. The flexible shield is enabled to reduce the entry of contaminants into the spherical bearing while the spherical bearing is at rest and while the spherical bearing is in motion. | 10-01-2009 |
20100303393 | Microfabricated Fluid Dynamic Bearing - A fluid dynamic bearing formed by a microelectromechanical systems (MEMS) wafer-level batch-fabrication process is provided. The process results in a high performance and high reliability fluid dynamic bearing having features including higher bearing lifetime at high RPM, improved bearing stiffness, durability and thrust/restoring forces capabilities. The present invention is especially useful with small form factor disc drive memory devices having constraints in motor height, such as a 2.5 inch disc drive, requiring high performance including high rotational speed and large areal density. A sacrificial layer is utilized in the process to simultaneously form symmetrical facing surfaces of relatively rotatable components. The facing surfaces define, therebetween, a desired feature, such as a journal bearing, a thrust bearing, a fluid channel, a fluid reservoir, a capillary seal, pressure generating grooves, and other profile geometries. Such geometry control allows for design freedom in obtaining a desired bearing performance and stiffness. | 12-02-2010 |
20120027326 | FLUID DYNAMIC BEARING MOTOR INCLUDING MOLDED PLASTIC - A fluid dynamic bearing motor and method are described, wherein motor components, including complex shaped motor components, are molded of plastic. The molding ensures form control and dimensional control thereby accomplishing design requirements, and eliminating or reducing component costs and component machining. The mold can be shaped to form various motor geometries, thereby eliminating the need for multiple component assembly and related assembly costs. In an aspect, a plastic integral motor hub is formed by injection molding. Alternatively, a plastic motor hub is affixed to a metal sleeve. In another aspect, fluid containment structures are molded into the motor component, reducing the number of components as compared with machined metal components. In a further aspect, bearing structures such as grooves are molded into the motor component, thereby eliminating processes such as electrochemical machining. In yet a further aspect, a plastic hub faces a thrustplate, reducing expensive sleeve machining. | 02-02-2012 |
20150315932 | FLUID FILM CONICAL OR HEMISPHERICAL FLOATING RING BEARINGS - A turbocharger is provided with an improved bearing which is formed as a floating ring bearing or a semi-floating ring bearing having a conical or hemispherical shape which supports both journal and thrust loads. The floating ring bearing may have conical floating ring bearings ( | 11-05-2015 |
384110000 |
Conical | 3 |
20090324150 | THROUGH-SHAFT FLUID RECIRCULATION FOR A SPINDLE MOTOR - An apparatus and method are described for a fluid dynamic bearing motor as may be utilized in a disc drive memory system. A fluid seal is situated at a first axial end of a bearing, and a grooved pumping seal is situated at a second axial end of the bearing. In an aspect, a fluid recirculation passageway is defined through a shaft and a thrustplate, to recirculate fluid from axially above the grooved pumping seal at the second axial end of the bearing to the first axial end of the bearing. Any air ingested at the grooved pumping seal, or which came out of solution from the fluid, is purged into a fluid reservoir and out the fluid seal. In an aspect, fluid is recirculated from the center of the journal bearing and the bearing pressure grooves to the fluid recirculation passageway and toward an air purging fluid seal. | 12-31-2009 |
20120263402 | FLUID BEARING ASSEMBLY - A fluid bearing assembly well-suited for use as high performance, web handling roller includes a stationary inner component that extends coaxially within a rotatable outer component. The inner component includes a single conical member from which extends a narrow stem. The delivery of fluid into a nominal gap between the inner and outer components creates a tapered bearing, with the outer component capable of frictionless rotation relative to the inner component. A thrust plate is axially mounted onto the stem and is retained thereon by a threaded nut. By delivering fluid into a nominal gap between the thrust plate and the outer component, a thrust bearing is created which counterbalances the net axial force produced from the tapered bearing. Furthermore, precise adjustment of the tapered bearing air gap can be achieved through rotation of the threaded nut, thereby enabling certain performance characteristics of the fluid bearing assembly to be modified. | 10-18-2012 |
20160115995 | Fluid-Dynamic Bearing System - The invention relates to a fluid-dynamic bearing system comprising a stationary bearing component ( | 04-28-2016 |
384111000 |
Outer recess forming fluid pad | 2 |
20090067765 | Spindle motor having hydrodynamic bearing - Provided is a spindle motor having a hydrodynamic bearing with an improved structure to prevent oil leakage due to a centrifugal force generated when the motor is rotating. In the spindle motor, an oil gap is formed between a rotor and a fixing body to form the hydrodynamic bearing to rotate the rotor, and an oil groove is formed in a surface of the rotor or the fixing body, which faces the oil gap. Also, a taper seal is formed in an area that extends from the oil gap and contacts the air, between the rotor and the fixing body, and the rotor constituting the taper seal is placed of the rotation center of the fixing body. Thus, thus the amount of oil in the taper seal is minimized and oil leakage can be stably prevented. | 03-12-2009 |
20090074337 | Hybrid hydro (air) static multi-recess journal bearing - Multi-recess hydrostatic journal bearings support a rotating shaft and have inclined surfaces, each inclined surface forming a variable radial gap with the surface of the shaft, the variable gaps converging in the direction of rotation of the shaft to increase hydrodynamic forces, reduce a turbulent component of shear friction, and improve the thermal stability of the journal bearing. The inclined surfaces can be formed in one or more of portions of recess bottoms in recesses, portions of gap lands surrounding recesses, and portions of an inner surface of a bushing. | 03-19-2009 |
384113000 |
Central member recess | 1 |
20090010578 | BEARING UNIT, AND MOTOR AND ELECTRONIC APPARATUS HAVING BEARING UNIT - A bearing unit includes: a shaft; a radial bearing configured to support the shaft in a circumferential direction; a thrust bearing configured to support one end of the shaft in a thrust direction; a housing having the radial bearing and the thrust bearing disposed in the inside and having a closed structure except a shaft insertion hole into which the shaft is fitted; a coming out preventing member provided on one end side of the radial bearing at which the thrust bearing is provided configured to prevent the shaft from coming out from the radial bearing; and viscous fluid filled in the housing. The coming out preventing member is made of a resin material having a value of a Young's modulus equal to or higher than 3.4 GPa. | 01-08-2009 |
Entries |
Document | Title | Date |
20080212906 | FLUID LUBRICATED BEARING DEVICE - An inner space of a housing sealed with a seal member as well as internal pores of a bearing member (pores in a porous structure) are filled with a lubricating oil without the presence of air, so that the oil surface of the lubricating oil is within a seal space. Under a reduced pressure of 100 Torr, no lubricating oil leaks outside of the housing even at any attitude of the fluid lubricated bearing device such as normal, inverted, or horizontal attitude. | 09-04-2008 |
20080240633 | HYDRODYNAMIC BEARING AND SPINDLE MOTOR AND INFORMATION RECORDING AND REPRODUCING APPARATUS EQUIPPED WITH THE SAME - As axis direction dimensions become smaller in HDD spindle motors as a result of thinner and more compact designs, there is a demand for hydrodynamic bearings with a long lifespan. As a means of solving this problem, a lubricant reservoir section is formed between a sleeve side surface and a cover side surface with a depth varying in a circumferential direction lubricant is circulated in a bearing gap section, a sleeve end face gap section larger than a bearing gap between a sleeve end face and the cover, and a connecting channel, and the lubricant reservoir section and the sleeve end face gap section are connected via an introducing gap section having a bubble separation function. | 10-02-2008 |
20080260309 | System and method for improving lubrication in a fluid dynamic bearing near the contact region - A system and method for improving lubrication in a fluid dynamic bearing are disclosed. A fluid dynamic bearing is formed. The fluid dynamic bearing comprises a shaft having an axis of rotation and a surface comprising a first groove at a first depth and a second groove at a second depth, wherein the first and second grooves are for supporting a film of lubricating fluid. The fluid dynamic bearing further includes a hub having an axis coincident to the axis of rotation and a complimentary surface juxtaposed to the shaft which is conducive to supporting the lubricating fluid such that the shaft is rotatably retained. | 10-23-2008 |
20080260310 | Fluid dynamic bearing system - The invention relates to a fluid dynamic bearing system that comprises at least one stationary part that has a shaft and two bearing plates disposed on the shaft at a mutual spacing, and at least one rotating part that is supported so as to rotate about a rotational axis with respect to the stationary part, and comprises a bearing bush and a sleeve enclosing the bearing bush. A bearing gap filled with bearing fluid is provided between the parts and at least one sealing gap for sealing the bearing gap that extends concentric to the rotational axis. The bearing comprises at least one fluid dynamic radial bearing and two fluid dynamic axial bearings and at least one recirculation channel that connects the two axial bearing regions to each other. According to the invention, the largest radial diameter of the recirculation channel is greater than or equal to the largest diameter of the sealing gap, and the smallest radial diameter of the recirculation channel is greater than or equal to the largest diameter of an adjacent bearing plate. Moreover, additional and effective deairing of the recirculation channel is effected by a venting device. To realize improved equilibrium of pressure in the bearing gap and improved retention of the bearing fluid, the sealing gaps can be inclined, at least in sections, at an angle α, β with respect to the rotational axis, wherein the angles may have different sizes. | 10-23-2008 |
20080273822 | Method And System For Withstanding A Shock Event For A Fluid Dynamic Bearing Motor - A system, method and means is provided for withstanding mechanical shock for use with fluid dynamic bearings. A sealing system is provided that withstands 1000 G shock events. In an aspect, a grooved pumping seal employed between a thrust plate and a shield, a thrust plate having spiral grooves, a fluid recirculation passageway, and a reservoir creates an asymmetric pressure gradient. In an aspect, fluid is retained and air is purged utilizing an enlarged fluid reservoir, axial channels and an angled fill hole. In an aspect, a shaft is attached to a top cover supplying radial stiffness, and an enlarged single-sided thrust plate improves dynamic parallelism. | 11-06-2008 |
20080292228 | Shaft Member for Fluid Lubrication Bearing Apparatuses and a Method for Producing the Same - A shaft member for hydrodynamic bearing apparatuses which can restore the pressure balance in a thrust bearing gap formed on both axial sides of the flange portion in an early stage is provided at low costs. | 11-27-2008 |
20080292229 | Compliant foil-fluid bearing support arrangement - A foil-fluid bearing assembly adapted for supporting a shaft within an outer bearing housing and is adapted for accommodating angular misalignment of the rotating shaft relative to the housing. | 11-27-2008 |
20080298730 | HYDRODYNAMIC BEARING DEVICE, SPINDLE MOTOR EQUIPPED WITH SAME, AND RECORDING AND REPRODUCING APPARATUS - To provide a hydrodynamic bearing device with which the generation of negative pressure inside the bearing portion can be prevented, and durability and reliability can be increased, even when the hydrodynamic bearing device is subjected to impact or vibration, and to provide a spindle motor and a recording and reproducing apparatus equipped with this hydrodynamic bearing device. | 12-04-2008 |
20080298731 | HYDRODYNAMIC BEARING DEVICE, SPINDLE MOTOR, AND RECORDING AND REPRODUCING APPARATUS EQUIPPED WITH SAME - A hydrodynamic bearing device | 12-04-2008 |
20090046960 | FLUID DYNAMIC BEARING DEVICE - A fluid dynamic bearing device which can exhibit high bearing performance is provided at low costs by forming a highly accurate bearing gap. | 02-19-2009 |
20090052817 | Methods of Hydraulic Compensation for Magnetically Biased Fluid Dynamic Bearing Motor - A fluid dynamic bearing motor including a stationary sleeve, a rotating shaft axially disposed through the sleeve, a journal gap between the shaft and the sleeve, the gap defined by first and second interfacial surfaces of the shaft and sleeve, at least one set of fluid dynamic grooves formed on the first interfacial surface of the journal gap, and at least one step defined on the second interfacial surface of the journal gap. | 02-26-2009 |
20090060403 | SLEEVE FOR HYDRODYNAMIC BEARING DEVICE, HYDRODYNAMIC BEARING DEVICE EQUIPPED WITH SAME, SPINDLE MOTOR, INFORMATION PROCESSING APPARATUS, AND METHOD FOR MANUFACTURING SLEEVE FOR HYDRODYNAMIC BEARING DEVICE - A sleeve for a hydrodynamic bearing device, a hydrodynamic bearing device equipped with the sleeve, a spindle motor, information recording and reproducing and processing apparatus, and a method for manufacturing a sleeve for a hydrodynamic bearing device are provided that are capable of reducing costs through appropriate sealing treatment. | 03-05-2009 |
20090074336 | Fluid dynamic bearing pattern and fluid dynamic bearing - The invention relates to a fluid dynamic bearing pattern that is disposed on at least one bearing surface of the two bearing parts of a fluid dynamic bearing that are moveable with respect to each other along a direction of movement. The bearing pattern comprises two related grooved sections, each section extending at an acute angle with respect to the direction of movement and exerting a defined pumping effect on the bearing fluid found in the bearing when the bearing parts move with respect to each other. According to the invention, the first section is disposed at an angle α and the second section at an angle β with respect to the direction of movement, the two angles varying in size. | 03-19-2009 |
20090092345 | System and method to electrically ground fluid dynamic bearings - A Spindle motor assembly that utilizes a fluid dynamic bearing electrically grounded to provide a conductive path through the spindle motor assembly. In one embodiment, the fluid dynamic bearing includes a liquid metal that is conductive and of low electrical resistance that provides the conductive path between the spindle and the spindle housing. | 04-09-2009 |
20090097788 | Hydrodynamic bearing assemblies, and hydrodynamic bearing apparatuses and motor assemblies using same - Hydrodynamic bearing assemblies and apparatuses are disclosed. Such hydrodynamic bearing assemblies may be employed in bearing apparatuses for use in downhole motors of a subterranean drilling system or other mechanical systems. In one embodiment of the present invention, a hydrodynamic bearing assembly includes a plurality of bearing segments distributed circumferentially about an axis. Each bearing segment includes a superhard bearing surface. The plurality of bearing segments define a plurality of seams. Each seam is formed between circumferentially-adjacent bearing segments of the plurality of bearing segments. Further embodiments of the present invention include hydrodynamic bearing apparatuses and downhole motors that may utilize any of the disclosed hydrodynamic bearing assemblies. | 04-16-2009 |
20090129710 | FLUID DYNAMIC BEARING DEVICE - The present invention aims to achieve a reduction in cost for a fluid dynamic bearing device. The fluid dynamic bearing device supports a shaft member ( | 05-21-2009 |
20090148084 | Fluid Dynamic Bearing Device - A fluid dynamic bearing device equipped with a shaft member of high strength and capable of maintaining high bearing performance is provided at low cost. A shaft blank ( | 06-11-2009 |
20090190869 | FLUID DYNAMIC BEARING DEVICE - The fluid dynamic bearing device includes a housing, two bearing sleeves fixed to the housing at positions axially spaced apart from each other, and a shaft member inserted along inner peripheries of the bearing sleeves. The housing includes a spacer portion protruding further radially inwardly than inner peripheral surfaces to which the bearing sleeves are fixed. An axial fluid path is formed in the spacer portion, and the axial fluid path communicates to flow paths formed by axial grooves of the bearing sleeves. | 07-30-2009 |
20090208153 | HOUSING FOR FLUID LUBRICATION BEARING APPARATUSES, A HOUSING FOR HYDRODYNAMIC BEARING APPARATUSES, AND A METHOD FOR PRODUCING THE SAME - A fluid lubrication bearing apparatus which can stably produce high bearing performance is provided at low costs. Moreover, a method for producing a housing for hydrodynamic bearing apparatuses which can improve the accuracy of form of the housing of this type at low costs is provided. | 08-20-2009 |
20090232429 | Device comprising a support structure and a rotating shaft and wind turbine - A device is provided having a support structure and a rotating shaft having a centre axis which rotating shaft and support structure are pivotable supported against each other by at least one hydrodynamic rotary bearing including a first bearing part and a second bearing part pivotable relatively to each other, a lubricant and a contact zone between the first bearing part and the second bearing part at least when the hydrodynamic rotary bearing is at rest, wherein the rotating shaft and the support structure are shaped in such a way and the hydrodynamic rotary bearing is in such a way arranged on the rotating shaft and the support structure that the contact zone of the hydrodynamic rotary bearing is submerged in the lubricant even when the hydrodynamic rotary bearing is at rest. | 09-17-2009 |
20090279817 | FLUID DYNAMIC BEARING APPARATUS - A fluid dynamic bearing apparatus having an increased a value of tolerance for a moment load is provided. | 11-12-2009 |
20090285514 | FLUID DYNAMIC BEARING DEVICE - Provided is a fluid dynamic bearing device which has excellent moment rigidity and an improved working efficiency in assembling and parts control, and in which a bearing sleeve can be easily manufactured. A plurality of bearing sleeves are axially disposed in the fluid dynamic bearing device. The bearing sleeves ( | 11-19-2009 |
20090297078 | FLUID BEARING DEVICE - [Problems] Provided is a fluid bearing device in which bearing sleeves are positioned and fixed with respect to a housing with high accuracy. | 12-03-2009 |
20090324149 | FLUID DYNAMIC BEARING DEVICE - An outer peripheral surface ( | 12-31-2009 |
20100034492 | CT SCANNER GANTRY WITH AEROSTATIC BEARING AND SEGMENTED RING MOTOR - Disclosed is a device having a rotor that is adapted to be rotated relative to a stator, with hydrostatic bearings being used as radial bearings and as axial bearings of the rotor. A motor is provided as a direct drive, having a ring-shaped part and also a plurality of motor segments which are in magnetic engagement with the ring-shaped part. In order to generate additional bearing load force, additional motor segments having permanent magnets are provided. For reasons of safety, axial support rolls are provided which, when the motor has attained a given bearing load force, are spaced from a running face of the rotor, and which, in a case of too low or an absence of load force, prevent a displacement of the rotor away from the axial bearings. | 02-11-2010 |
20100054640 | FLUID DYNAMIC BEARINGS - A fluid dynamic bearing. A shaft is fit in the sleeve and rotates with respect thereto. A lubricant is filled between the shaft and the sleeve. At least one elliptical groove is formed on either the shaft or the sleeve and between the shaft and the sleeve. When the shaft rotates with respect to the sleeve, the lubricant is filled in the elliptical groove. | 03-04-2010 |
20100124387 | Fluid dynamic bearing system - The fluid dynamic bearing system has at least one stationary part, and at least one rotating part that is supported rotatable about a rotational axis with respect to the stationary part. A bearing gap filled with bearing fluid is formed between mutually opposing surfaces of the stationary and of the rotating part. The bearing system comprises at least one fluid dynamic radial bearing and at least one fluid dynamic axial bearing that are disposed along sections of the bearing gap. Moreover, sealing means for sealing the open ends of the bearing gap are provided. According to the invention, one of the sealing means comprises an annular sealing gap that has one end connected to the bearing gap and one end connected to an annular reservoir, the outside radius of the reservoir measured from the rotational axis being larger than the outside radius of the sealing gap. | 05-20-2010 |
20100166343 | SHAFT MEMBER FOR FLUID DYNAMIC BEARING DEVICE - Provided is a shaft member for a fluid dynamic bearing device, which is excellent in wear resistance and which can exert a high dynamic pressure effect. A shaft material ( | 07-01-2010 |
20100166344 | FLUID DYNAMIC BEARING DEVICE AND METHOD OF MANUFACTURING THE SAME - Provided is a fluid dynamic bearing device in which an assembly of a bearing sleeve to a housing is facilitated and which has excellent moment rigidity. A fluid dynamic bearing device ( | 07-01-2010 |
20100166345 | FLUID DYNAMIC BEARING DEVICE - A protrusion ( | 07-01-2010 |
20100166346 | DYNAMIC BEARING DEVICE - A dynamic bearing device is provided, which can prevent abrasion powder generated when a sealing member is pushed into an inner circumference of a housing from entering the housing. A sealing member is inserted into an inner circumference of an opening of a housing with an adhesive interposed therebetween The adhesive moving forward in a pushing direction of the sealing member is retained by a capillary action in a lower tapered space between an outer circumference of the sealing member and the inner circumference of the housing. Abrasion powder is captured by the adhesive in the tapered space so as to be confined in the adhesive as a result of the setting of the adhesive. | 07-01-2010 |
20100189383 | FLUID DYNAMIC BEARING DEVICE AND ASSEMBLING METHOD THEREOF - A first axial gap (L | 07-29-2010 |
20100202715 | FLUID DYNAMIC BEARING DEVICE - To manufacture a shaft member, which is excellent in both accuracy and strength at low cost, a shaft member ( | 08-12-2010 |
20100226601 | FLUID DYNAMIC BEARING DEVICE | 09-09-2010 |
20100232733 | FLUID DYNAMIC BEARING DEVICE - In this type of fluid dynamic bearing device, a dynamic pressure generating part having high molding accuracy is formed at low cost. | 09-16-2010 |
20100239194 | DISK DRIVE DEVICE IMPROVED IN HANDLING PROPERTY - A disk drive device includes a base member, a hub member, a shaft, a flange, a sleeve, a thrust dynamic pressure generation portion including thrust dynamic pressure grooves such that thrust dynamic pressure is generated in a thrust space, a radial dynamic pressure generation portion including radial dynamic pressure grooves such that radial dynamic pressure is generated in a radial space, a lubricant filled in the thrust space in the thrust dynamic pressure generation portion and the radial space in the radial dynamic pressure generation portion, a capillary seal portion for holding the lubricant in the thrust space and the radial space, and a circulation pathway by which the thrust dynamic pressure generation portion and the radial dynamic pressure generation portion communicate with each other in order to circulate the lubricant. At least one of the areas among where the thrust dynamic pressure groove is formed and where the radial dynamic pressure groove is formed is made of an impact absorption body with a coefficient of elasticity less than or equal to 20 GPa. | 09-23-2010 |
20100254640 | Apparatus With a Directly Driven Rotating Body and Aerostatic Bearings - A device having a directly driven rotating body ( | 10-07-2010 |
20110033143 | DISK DRIVE DEVICE IMPROVED IN ANTI-VIBRATION CHARACTERISTIC - A disk drive device includes a rotating body, a fluid dynamic bearing unit that rotatably supports the rotating body, and a drive unit. The fluid dynamic bearing unit has: a lubricant holding portion in which lubricant is held; a first thrust dynamic pressure groove with which a first thrust dynamic pressure generating portion for generating the dynamic pressure in the pump-in direction, which is oriented toward the inside of the lubricant holding portion, is structured; and a second thrust dynamic pressure groove with which a second thrust dynamic pressure generating portion for generating at least the dynamic pressure in the pump-out direction, is structured. The first thrust dynamic pressure generating portion and the second thrust dynamic pressure generating portion have dynamic pressure generation characteristics in which, when the rotating body is biased in the rotational axis direction from the state where the rotating body is floating in the lubricant, the sum of the changes in the dynamic pressure in the pump-out direction is larger than that of the changes in the dynamic pressure in the pump-in direction. | 02-10-2011 |
20110123139 | DYNAMIC PRESSURE BEARING AND SPINDLE MOTOR USING THE SAME - A dynamic pressure bearing has a reduced axial dimension and is constructed to ensure smooth feeding of a lubricating oil. The dynamic pressure bearing includes a communicating hole and at least one tapered seal, and is constructed such that an opening angle of one of the at least one tapered seal through which oil feeding is possible is in a range of about 30 degrees inclusive to about 180 degrees exclusive, a tapered seal wall surface depth W | 05-26-2011 |
20110200279 | ROTARY DEVICE - A rotary device according to an aspect of the invention includes: a sleeve having an inner cylindrical surface, a first end portion and a second end portion at respective ends of the inner cylindrical surface; a shaft that is accommodated in the inner cylindrical surface in a manner rotatable relative to the inner cylindrical surface; a fluid present in a space between the shaft and the sleeve; a first pump portion formed in a middle portion of the inner cylindrical surface and configured to cause the fluid to flow toward the first end portion by the relative rotation of the shaft and the sleeve; a first radial narrow gap formed at a region of the inner cylindrical surface on a side of the first end portion with respect to the first pump portion; and a first circulation path communicated with the first pump portion. | 08-18-2011 |
20110299802 | FLUID-SUPPORTED THRUST BEARINGS - A thrust bearing allows a first structure to rotate relative to a second structure about an axis of rotation while supporting an axial load between the first structure and the second structure. In an embodiment, the thrust bearing comprises a first annular bearing race slidingly disposed in a first annular recess in the first structure. In addition, the thrust bearing comprises a second annular bearing race engaging the second structure. Further, the thrust bearing comprises a plurality of circumferentially spaced roller elements axially disposed between the first bearing race and the second bearing race. The roller elements contact the first bearing race and the second bearing race. The first bearing race and the first recess define a first annular fluid cavity axially positioned between the first bearing race and the first structure. The first bearing race rides on a fluid disposed in the first fluid cavity. | 12-08-2011 |
20120008888 | FLUID DYNAMIC BEARING DEVICE - A flatness of a part of a component formed of a resin material that faces a thrust bearing gap is easily increased. A housing ( | 01-12-2012 |
20120020596 | GAS BEARING AND METHOD OF MANUFACTURING THE SAME - A gas bearing ( | 01-26-2012 |
20120070108 | HYDROSTATIC ARRANGEMENT FOR A SPIN WELDING MACHINE AND METHOD OF SUPPORTING SPINDLE FOR THE SAME - A hydrostatic arrangement for a spin welding machine includes, a spindle rotationally supported with at least one of a thrust hydrostatic bearing and a journal hydrostatic bearing, and a hydraulic unit configured to supply liquid to the at least one of a thrust hydrostatic bearing and a journal hydrostatic bearing at at least two different pressures. | 03-22-2012 |
20120087607 | RESTRAINING MOTOR SHAFT PLAY - An apparatus and associated method characterized by an enclosure having a side member that defines a substantially orthogonally directed cavity penetrating the side member. A motor shaft in the enclosure has a distal end that is operably aligned with the cavity. A shear transfer member in the enclosure is operably affixed to the motor shaft. One of the shaft and the shear transfer member is sized for a close mating engagement with the side member in the cavity, and the shear transfer member is further sized for being simultaneously shear coupled to the side member. | 04-12-2012 |
20120183243 | ROTATING DEVICE - A rotating device includes a fixed body having a base and a shaft, a hub, and a rotating body having a rotating-body-side encircling member fixed to the hub and encircling the shaft. A lubricant is present between the fixed body and the rotating body. The rotating-body-side encircling member and the shaft are each formed with a radial dynamic pressure generating groove. The fixed body includes a base-side encircling member having a disk part encircling the base-side portion of the shaft and a cylinder part encircling the rotating-body-side encircling member. The base-side encircling member has the disk part fixed to the shaft by interference fitting, and has the cylinder part fixed to the base. An air-liquid interface is located in a gap in the radial direction between the inner periphery of the cylinder part and the outer periphery of the rotating-body-side encircling member. | 07-19-2012 |
20120230617 | 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 localized area to counteract angular displacement. The primary groove extends a greater circumferential distance about the bearing surface as compared to the secondary groove. The secondary groove apex is also situated closer to an axial end of the journal bearing, or closer to an outer diameter of the thrust bearing, as compared to the primary groove apex. Bearing wear is prevented or minimized under gyroscopic loading. The improved angular stiffness may result in the heads of a storage device being accurately aligned with disc storage tracks. Discs may thus be designed with increased track densities, allowing for smaller discs and increased storage capacity of discs. | 09-13-2012 |
20120288222 | ADJUSTABLE GAP FOR A FLUID DYNAMIC BEARING - A fluid bearing motor. The fluid bearing motor includes a stationary sleeve, a backiron, a hub coupled to the backiron, and a gap forming component. The hub is operable to rotate with respect to the stationary sleeve. The gap forming component is attached to the stationary sleeve and forms a gap between the stationary sleeve and the backiron. The size of the gap dynamically changes in response to changes in temperature. | 11-15-2012 |
20120294556 | FLUID DYNAMIC BEARING DEVICE - A fluid dynamic bearing device | 11-22-2012 |
20130064484 | HUB AND SPINDLE ASSEMBLY - A rotating hub and fixed spindle assembly with first and second fluid dynamic journal bearings and first and second fluid dynamic thrust bearings for a disc drive memory system has a pump seal and a radial ring seal at a first axial terminus for lubricant containment, and a capillary seal and a labyrinth seal at a second axial terminus for lubricant containment and storage. Lubricant fluid pressure differences between first and second seals are minimized through one or more lubricant fluid communicating channels in the hub assembly, in order to minimize lubricant fluid loss through a seal. Lubricant fluid can also be purged of any air bubbles by lubricant fluid circulation through the channel. | 03-14-2013 |
20130071054 | BEARING MEMBER AND FLUID DYNAMIC BEARING DEVICE USING SAME - When a bearing member (bearing sleeve ( | 03-21-2013 |
20130129268 | SPINDLE MOTOR - There is provided a spindle motor including: a shaft having a lower end portion fixed into a base member; a thrust plate fixed to the shaft; an upper sleeve disposed above the thrust plate and forming a first bearing clearance with the shaft; a lower sleeve disposed below the thrust plate and forming a second bearing clearance with the shaft; and a rotor hub rotating together with the upper and lower sleeves, wherein the upper sleeve includes an extension part extended toward the lower sleeve, and the lower sleeve includes a clearance adjusting part disposed to face the extension part when being coupled to the upper sleeve and extended toward the upper sleeve. | 05-23-2013 |
20130182979 | SINTERED BEARING - With use of a fine copper-based powder, specifically a copper-based powder that contains particles each having a diameter of 45 μm or less by 80 weight % or more, an air permeability can be significantly reduced. When this copper-based powder is used, a sintered metal can be easily formed to contain copper by 40% or less (contain iron by 60% or more) to enhance abrasion resistance, and to have an oil permeability of 1.00 g/10 min or less to increase an oil film formation rate. | 07-18-2013 |
20130322792 | HYDRODYNAMIC BEARING ASSEMBLY AND SPINDLE MOTOR INCLUDING THE SAME - There are provided a hydrodynamic bearing assembly and a spindle motor including the same. The hydrodynamic bearing assembly includes: a sleeve including a shaft hole to have a shaft rotatably installed therein; and a cover member covering the shaft hole at a lower portion of the shaft hole in an axial direction, wherein an inner surface of the sleeve is provided with depression parts depressed in an outer diameter direction between upper and lower portions of the sleeve and portions in which radial bearings are formed, such that the portions in which the radial bearings are formed are provided with bearing closure adhesion parts allowing the portions in which the radial bearings are formed to be closer to the shaft than portions other than the portions in which the radial bearings are formed. | 12-05-2013 |
20130336604 | FLUID DYNAMIC BEARING DEVICE - An inner peripheral surface and a lower end surface of a bearing sleeve made of a sintered metal are each formed into a smooth cylindrical surface or a flat surface that does not have a dynamic pressure generating portion. Thus, a step of forming the dynamic pressure generating portion can be omitted from a manufacturing step of the bearing sleeve, and cost of dies can be markedly reduced. Further, the inner peripheral surface of the bearing sleeve is formed into the smooth cylindrical surface, and hence a radial dynamic pressure generating portion is formed on an outer peripheral surface of a shaft member. However, the outer peripheral surface of the shaft portion is accessible to tools, and hence the radial dynamic pressure generating portion can be formed easily with high accuracy. As a result, accuracy of a radial bearing gap is enhanced so that a bearing rigidity is enhanced. | 12-19-2013 |
20140029877 | SHAFT AND BEARING ARRANGEMENT AND HYDROSTATIC SPINDLE FOR HIGH SPEED APPLICATIONS - A spindle includes a housing, a shaft rotatably mounted to the housing, a first bearing arrangement and a second bearing arrangement. The first bearing arrangement has at least one first pocket defined between the first bearing arrangement and the shaft forming a first radial hydrostatic bearing and a longitudinal recess between the first bearing arrangement and the shaft forming a first portion of a thrust hydrostatic bearing. Fluid supplied to the first portion of the thrust hydrostatic bearing is supplied thereto from the at least one first pocket directly through a first radial gap defined between the first bearing arrangement and the shaft. The second bearing arrangement has a longitudinal chamber between the second bearing arrangement and the shaft forming a second portion of the thrust hydrostatic bearing. Longitudinal forces on the shaft from the first portion of the thrust longitudinal bearing and the second portion of the thrust longitudinal bearing are in opposing directions. | 01-30-2014 |
20140050427 | FLUID DYNAMIC BEARING DEVICE - A fluid dynamic bearing device ( | 02-20-2014 |
20140133789 | FOLDED FLUID CHANNEL FOR A FLUID DYNAMIC BEARING MOTOR - An apparatus includes a stationary shaft and a sleeve rotatable with respect to the shaft. A fluid dynamic bearing is defined by the stationary shaft and the sleeve. A fluid channel includes a first axially extending portion in the fluid dynamic bearing, and a radially extending portion extending radially outward from the first axially extending portion. In addition the fluid channel includes a second axially extending portion extending axially downward from the radially extending portion. The apparatus further includes a pump seal including grooves formed in the second axially extending portion. | 05-15-2014 |
20140147065 | ROTATING DEVICE - A rotating device includes a shaft body that has a shaft, a first flange extending outwardly from the outer periphery of the shaft, and a second flange, a bearing body that has a shaft encircling member encircling the shaft between the first flange and the second flange, a first thrust opposing part formed between the shaft encircling member and the first flange, a second thrust opposing part formed between the shaft encircling member and the second flange, an intermediate space provided in a gap between the shaft and the shaft encircling member, a radial dynamic pressure bearing, a first communication channel that allows the first thrust opposing part to be in communication with the intermediate space, and a second communication channel that allows the second thrust opposing part to be in communication with the intermediate space. | 05-29-2014 |
20140205220 | HUB AND SPINDLE ASSEMBLY - A rotating hub and fixed spindle assembly with first and second fluid dynamic journal bearings and first and second fluid dynamic thrust bearings for a disc drive memory system has a pump seal and a radial ring seal at a first axial terminus for lubricant containment, and a capillary seal and a labyrinth seal at a second axial terminus for lubricant containment and storage. Lubricant fluid pressure differences between first and second seals are minimized through one or more lubricant fluid communicating channels in the hub assembly, in order to minimize lubricant fluid loss through a seal. Lubricant fluid can also be purged of any air bubbles by lubricant fluid circulation through the channel. | 07-24-2014 |
20140286600 | APPARATUS INCLUDING CAPILLARY AND LABYRINTH SEALS - Provided herein is an apparatus including a stationary portion having a thrust cup; a rotating portion having a sleeve configured to be rotatable with respect to the stationary portion; a first axially extending space defined by the thrust cup and the sleeve, wherein the first axially extending space includes a second portion positioned above a first portion of the first axially extending space; a capillary seal in the first portion of the first axially extending space; and a labyrinth seal, in the second portion of the first axially extending space. | 09-25-2014 |
20150147010 | FLUID DYNAMIC BEARING DEVICE AND MOTOR WITH SAME - A fluid dynamic bearing device ( | 05-28-2015 |
20150316100 | FLUID DYNAMIC BEARING MOTORS WITH DIFFERENT WIDTH PUMP SEALS AND JOURNAL BEARINGS - In certain embodiments, a motor includes a shaft positioned adjacent a sleeve for relative rotation. The sleeve includes a first radial recirculation channel. The shaft and sleeve form first and second gaps. The first gap is configured to form a pump seal, is positioned above the first radial recirculation channel, and has a width measured between the shaft and sleeve. The second gap is configured to form a journal bearing, is positioned below the first radial recirculation channel, and has a width measured between the shaft and sleeve. The width of the first gap is greater than the width of the second gap. | 11-05-2015 |
20160138649 | SYSTEM AND METHOD FOR HYDROSTATIC BEARINGS - A system, includes a hydraulic transfer system configured to exchange pressures between a first fluid and a second fluid, wherein the first fluid has a pressure higher than the second fluid, comprising: a sleeve; a cylindrical rotor disposed within the sleeve in a concentric arrangement and has a first end face and a second end face disposed opposite each other; a first end cover having a first surface that interfaces with the first end face of the cylindrical rotor; a second end cover having a second surface that interfaces with the second end face of the cylindrical rotor; and a hydrostatic bearing system configured to utilize a bearing fluid at a pressure higher than the second fluid to resist axial displacement, radial displacement, or both axial and radial displacement of the cylindrical rotor. | 05-19-2016 |
20180023620 | Turbocharger | 01-25-2018 |