Class / Patent application number | Description | Number of patent applications / Date published |
384112000 | Grooved thrust bearing surface | 32 |
20080212907 | HYDRODYNAMIC BEARING, AND HYDRODYNAMIC BEARING-TYPE ROTARY DEVICE AND RECORDING AND REPRODUCING APPARATUS EQUIPPED WITH SAME - The angular stiffness of a bearing is kept high, and at the same time air inside the bearing is discharged smoothly, without accumulating, which prevents oil film separation on the bearing. With the present invention, a communicating hole is provided, the hole and a radial hydrodynamic groove constitute a circulation path for a lubricant, there is a first thrust bearing face in contact with the circulation path, there is a first hydrodynamic groove on the face, this groove is a herringbone groove with a pump-in pattern, and no low-pressure part is generated in the thrust bearing, so even if the bearing undergoes a pressure change, there is no risk that the air accumulated in a low-pressure part will expand and cause oil film separation on the bearing face. Also, the bubbles are smoothly discharged by circulation of the lubricant in the asymmetrical radial hydrodynamic groove, and there is a pressure distribution such that the pressure generated at the face during bearing rotation is sufficiently high at the outer peripheral portion of the groove pattern, and angular stiffness is high. | 09-04-2008 |
20080304775 | HYDRODYNAMIC BEARING DEVICE, AND RECORDING AND REPRODUCING APPARATUS EQUIPPED WITH SAME - There is provided a hydrodynamic bearing device that maintains high bearing angular stiffness, and that prevents oil film separation in the bearing by smoothly discharging any bubbles present inside the bearing. With a hydrodynamic bearing device, a communicating hole and a radial hydrodynamic groove constitute a circulation path for a lubricant, and a first thrust bearing surface is provided at a location in contact with the circulation path. A first hydrodynamic groove formed in the first thrust bearing surface is a spiral groove with a pump-in pattern. Any bubbles in the bearing are smoothly discharged by the circulation of the lubricant produced by the asymmetrical radial hydrodynamic groove. The pressure generated at the thrust bearing surface during rotation of the bearing has a distribution such that there is a wide range of high pressure. | 12-11-2008 |
20080304776 | HYDRODYNAMIC BEARING DEVICE AND DISK ROTATING APPARATUS - In a hydrodynamic bearing device in which a radial bearing face having a dynamic pressure generating groove on a shaft or an inner periphery of a sleeve is provided and a clearance between the shaft and the sleeve is filled with lubricant, an annular depression is provided on one end face of the sleeve adjacent to a rotor hub and a cover plate for covering the depression is attached to the sleeve so as to define a reservoir for the lubricant or air for the purpose of preventing such a risk that absence of an oil film occurs in clearances of a bearing of the hydrodynamic bearing device due to outflow of oil upon forcing of the oil by air received into the bearing. A step portion is provided on the other end face of the sleeve such that the step portion and the reservoir are communicated with each other by a communication hole. During operation of the hydrodynamic bearing device, air in the hydrodynamic bearing device reaches the reservoir via the communication hole so as to be discharged from the reservoir. | 12-11-2008 |
20090022438 | BEARING ASSEMBLY, MOTOR, AND DISK DRIVE - A sleeve and a sleeve housing are bonded to each other with adhesive. A thrust dynamic pressure bearing portion is configured between a thrust plate attached to a distal end of a shaft and the lower end surface of the sleeve. An annular step portion having a smaller diameter is provided at the lower side of the sleeve housing, and the annular step portion meets the sleeve. An annular raised portion is provided between thrust dynamic pressure grooves on the lower end surface of the sleeve and the annular step portion. In this configuration, the surplus adhesive leaked from between the sleeve and the annular step portion can be blocked by the annular raised portion, thereby preventing the adhesive from flowing into the thrust dynamic pressure bearing portion. | 01-22-2009 |
20090028474 | HYDRODYNAMIC BEARING DEVICE, AND SPINDLE MOTOR EQUIPPED WITH SAME - There is provided a hydrodynamic bearing device with which the lubricant is prevented from leaking to the outside, and good seal performance can be maintained, and a spindle motor equipped with this hydrodynamic bearing device. The hydrodynamic bearing device comprises a shaft, a sleeve, a lubricant that fills a microscopic gap, a radial bearing portion, a thrust beating portion, and a bearing seal portion. The value of a function P | 01-29-2009 |
20090034888 | HYDRODYNAMIC BEARING UNIT - A housing for a hydrodynamic bearing unit of this type is formed from a resin material having high oil resistance and low outgassing property to ensure the cleanliness of the bearing unit. An ester-based lubricating oil is used as a lubricating oil filled inside the hydrodynamic bearing unit | 02-05-2009 |
20090092346 | Fluid dynamic bearing with a labyrinth seal - A device for providing an air-gap associated with a portion of a fluid dynamic bearing, a sleeve is provided and surrounds a portion of a shaft. The sleeve and the shaft are configured for establishing the air-gap proximal to a portion of the fluid dynamic bearing. In addition, a cap is also provided and coupled to the sleeve. The cap has an outer end proximal to a portion of the fluid dynamic bearing such that the air-gap is provided between the outer end of the cap and the portion of the fluid dynamic bearing, wherein the air-gap forms a labyrinth seal. | 04-09-2009 |
20090136165 | FLUID DYNAMIC BEARING UNIT - A fluid dynamic bearing unit is provided which has a high load capacity against a moment load, whose bearing sleeves can be manufactured and fixed easily, and which can provide a required fixing power. The bearing sleeve is inserted into an inner periphery of a housing, and its bottom end is fixed to the top end of a spacer part with an adhesive. Another bearing sleeve is inserted into another part of the inner periphery of the housing, and its top end is fixed to the bottom end of the spacer part with an adhesive. | 05-28-2009 |
20090154851 | 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. This sintered metal has independent pores, which do not communicate with each other, by selecting conditions for forming a desired sintered body within a predetermined range. The conditions includes a grain size of powdered metal of a material for the sintered metal, a molding pressure when the molded body is formed, sintering temperature and sintering period in the sintering step. | 06-18-2009 |
20090279818 | FOLDED FLUID CHANNEL FOR A FLUID DYNAMIC BEARING MOTOR - A system and method are provided for sealing a fluid dynamic bearing motor. A first and a second folded fluid channel are shaped for maximizing bearing axial span and establishing angular stiffness, to resist gyroscopic rocking of the facing bearing surfaces. The first folded fluid channel is limited to occupying at least a portion of the same axial space as the bearing. A first and a second fluid sealing system are connected to opposite axial ends of the bearing. The first fluid sealing system forms an active pumping seal to pump fluid during motor rotation. In an aspect, a top cover attached shaft, and a single thrust surface are employed, allowing for a rigid motor structure and power reduction in applications including high rotational speed disc drives. Also, by employing a rigid shaft design, significantly lower amplitude radial vibration responses are exhibited at higher frequencies than prior art motor designs. | 11-12-2009 |
20100129014 | SHAFT MEMBER FOR FLUID BEARING DEVICE AND METHOD OF PRODUCING THE SAME - [Object] To manufacture at lower cost a shaft member for a fluid dynamic bearing device, which is excellent in accuracy of bearing surfaces and shape accuracy between the bearing surfaces, and which has high fixation strength between a shaft portion and a flange portion. | 05-27-2010 |
20100239195 | Fluid dynamic bearing, motor, and recording-medium driving apparatus - A thinner fluid dynamic bearing capable of stable shaft rotation, a motor including the bearing, and a recording-medium driving apparatus including the bearing are provided. Pressure-generating grooves are provided in thrust surfaces of a thrust bearing portion | 09-23-2010 |
20100247008 | FLUID DYNAMIC BEARING, METHOD OF MANUFACTURING FLUID DYNAMIC BEARING, ROTATING DEVICE, AND DISK DRIVE DEVICE - A fluid dynamic bearing includes a shaft to which a resin flange is fixed by insert molding. The process where the flange is fixed to the shaft by insert molding includes a flange forming process in which the flange, fixed to the shaft, is formed by injecting the resin into a filled portion in the lower mold through an upper mold, while cooling at least part of the shaft, arranged in a shaft arrangement portion in a lower mold, with cooling water circulating through a cooling pipe. | 09-30-2010 |
20100247009 | AIR PURGING FOR A FLUID DYNAMIC BEARING - A robust spindle motor is provided having improved shock resistance for fluid containment, as well as enhanced air purging characteristics. In an aspect, axial displacement of relatively rotating components is restricted by utilizing a limiter situated adjacent to a limiter bushing forming an axial limiter gap therebetween. A fluid channel, at least partially diverging, extends from a hydrodynamic bearing to the axial limiter gap, and continues to a region beyond the axial limiter gap. In an aspect, an axially diverging slot is situated adjacent to the axial limiter gap. Power is reduced by reducing viscous drag between relatively rotating components, hydrodynamic bearing length is increased, and higher stiffness of the hydrodynamic bearing is provided. Fluid volume may be increased, thereby offsetting fluid evaporation losses and allowing for the use of lower viscosity lubricants. | 09-30-2010 |
20110033144 | DISK DRIVE DEVICE - In a disk drive device according to an embodiment, radial dynamic pressure corresponding portions are structured such that the diameters thereof expand toward the axial outside of the sleeve, and that the shaft is in surface-contact with each of the radial dynamic pressure corresponding portions when the rotational drive of the disk drive device is stopped. Further, a herringborn-shaped radial dynamic pressure groove is formed in each of the radial dynamic pressure corresponding portions. The radial dynamic pressure groove in each radial dynamic pressure corresponding portion is formed such that the axial outside length from the turned-back portion of the herringborn-shape is longer than the axial inside length therefrom. | 02-10-2011 |
20110293209 | SPINDLE MOTOR - Disclosed herein is a spindle motor having a fluid dynamic bearing as an oil gap formed between a rotator and a stator, wherein the stator includes a sleeve having a protruding part extending in a circumferential direction formed on the upper part thereof, the rotator includes a hub including an oil interface forming member positioned under the protruding part of the sleeve and coupled to the lower end thereof, and an oil interface of the oil gap is formed between the upper part of the oil interface forming member and the lower part of the protruding part of the sleeve. | 12-01-2011 |
20110317950 | Motor device - Disclosed is a motor device. The motor device according to an exemplary embodiment of the present invention includes a sleeve having a shaft hole expanding downwardly in an axial direction; a shaft having a head part having exposed to a top portion of the sleeve and a body part having a shape corresponding to the shaft hole; a rotor case combined to the head part and rotating in connection with the shaft; an oil sealing part formed between the rotor case and the sleeve and an oil interface to seal oil provided to have a taper shape; and a thrust dynamic part formed on at least one of the rotor case and the sleeve and pumping the oil interface in an inner-diameter direction from the oil interface at the time of the rotation of the rotor case. | 12-29-2011 |
20120213459 | THIN STRUCTURE ROTATING DEVICE HAVING IMPROVED IMPACT RESISTANCE - A rotating device includes: a rotating body, a fixed body and lubricant. A surrounding member in the fixed body has a sleeve and a housing for surrounding the sleeve. A first radial dynamic pressure generating groove and a second radial dynamic pressure generating groove are formed on at least one of the inner circumferential surface of the sleeve and the outer circumferential surface of a shaft in the rotating body. The sleeve has a flange portion protruding radially outward at the end portion of the sleeve near to a hub in the rotating body. A concave portion, which is made by axially concaving at least part of the area corresponding to a wall thickness of the sleeve on the inner circumference side of the flange portion, is circumferentially provided in the flange portion. | 08-23-2012 |
20120288223 | Hydrodynamic bearing assembly and motor having the same - There are provided a hydrodynamic bearing assembly and a motor having the same, the hydrodynamic bearing assembly including a shaft rotating together with a rotor case; and a sleeve rotatably supporting the shaft, wherein at least one of the shaft and the sleeve has first and second dynamic pressure grooves formed therein, the first dynamic pressure groove being disposed in an upper portion of at least one of the shaft and the sleeve in an axial direction and having a herringbone shape and the second dynamic pressure groove being disposed in a lower portion of at least one of the shaft and the sleeve in the axial direction so as to be spaced apart from the first dynamic pressure groove and having a spiral shape. | 11-15-2012 |
20130039609 | HYDRODYNAMIC BEARING ASSEMBLY AND MOTOR INCLUDING THE SAME - There are provided a hydrodynamic bearing assembly capable of increasing a storage amount of oil and preventing evaporation or leakage of the oil by increasing a length of a sealing part, and a motor including the same. The hydrodynamic bearing assembly includes: a sleeve supporting a shaft such that an upper end of the shaft protrudes upwardly in an axial direction; a sleeve housing provided to enclose an outer peripheral surface of the sleeve, and forming an oil interface between an inner peripheral surface thereof in an outer diameter direction and a main wall part protruding downwardly in the axial direction from a rotor case inserted into the upper end of the shaft; and a cover member provided in lower portions of the shaft and the sleeve and coupled to the sleeve housing while having a clearance therebetween. | 02-14-2013 |
20130142461 | SPINDLE MOTOR - There is provided a spindle motor including: a shaft; a sleeve rotatably supporting the shaft and forming a bearing clearance therewith filled with a lubricating fluid; a cover member installed on a lower end portion of the sleeve; a rotor hub coupled to an upper end portion of the shaft and having an extension wall part extended downwardly in an axial direction, to be disposed outwardly of the sleeve in a radial direction; and a stopper member fixedly installed on the extension wall part, and forming, together with an outer peripheral surface of the sleeve, a space having a liquid-vapor interface formed therein, the sleeve including a circulation hole formed therein to connect upper and lower portions thereof, the circulation hole being connected to a space formed by the stopper member and the outer peripheral surface of the sleeve. | 06-06-2013 |
20130163901 | HYDRODYNAMIC BEARING ASSEMBLY AND MOTOR INCLUDING THE SAME - There are provided a hydrodynamic bearing assembly and a motor including the same. The hydrodynamic bearing assembly includes: a shaft; and a sleeve having the shaft rotatably provided therein, having a bearing clearance formed between the shaft and the sleeve and filled with oil, and including a communication hole allowing the bearing clearance to be in communication with the outside, wherein the communication hole is sealed by a gas-liquid separating unit allowing gas to pass therethrough and blocking liquid. | 06-27-2013 |
20130216168 | ROTATING DEVICE - A rotating device comprises a hub, a shaft, and a bearing unit. The bearing unit includes a surrounding portion arranged to surround the shaft, and a facing portion arranged to face an end of the shaft. A gap between the shaft and the surrounding portion includes two dynamic pressure generation portions and an intermediate portion arranged between the two dynamic pressure generation portions. The bearing unit further includes a path of a lubricant arranged to connect one side of one dynamic pressure generation portion and the intermediate portion. The shaft and the bearing unit are arranged so that the lubricant pushed out of the other dynamic pressure generation portion towards a gap between the end of the shaft and the facing portion stays in the gap. | 08-22-2013 |
20130259412 | SPINDLE MOTOR - A spindle motor includes a base part including a base member and a lower thrust member fixed to the base member; a shaft having a lower end portion fixed to the base part and including a sealing groove formed in an outer peripheral surface thereof to form a liquid-vapor interface; an upper thrust member fixed to an upper end portion of the shaft; a rotating member including a sleeve part between the upper and lower thrust members; and an upper case fixing the upper end portion of the shaft. The shaft includes a connection groove recessed downwardly from an upper surface thereof and a communication hole for connecting the connection groove to the sealing groove. At least one of the shaft and a lower surface of the upper case has a connection part for connecting the connection groove to a space between the upper case and the upper thrust member. | 10-03-2013 |
20130322793 | ROTATING DEVICE - A rotating device includes a shaft body having a shaft, a first flange extending in the radial direction from the side face of the shaft, and a second flange extending outwardly of the radial direction from another end side, a freely rotatable bearing body including a shaft encircling member present between the second flange and the first flange in the axial direction, a radial dynamic pressure generating groove provided in either one of the shaft and the shaft encircling member, a first thrust dynamic pressure generating groove provided in either one of the first flange and the shaft encircling member, and a lubrication medium. An end of the region where the radial dynamic pressure generating groove is formed and which is distant from the second flange is located outwardly of the region where the first thrust dynamic pressure generating groove is disposed in the axial direction. | 12-05-2013 |
20140037233 | FLUID DYNAMIC BEARING HAVING PRESSURE-GENERATING SURFACE PATTERNS - The invention relates to a fluid dynamic bearing system having pressure-generating surface patterns that comprises at least two bearing parts that are rotatable with respect to one another and form a bearing gap filled with bearing fluid between associated bearing surfaces. The surface patterns are disposed on at least one bearing surface that is defined by a first rim and a second rim, hydrodynamic pressure being built up within the bearing gap on rotation of the bearing parts with respect to one another. According to the invention, at least parts of the surface patterns extend from the first rim to the second rim of the bearing surface. | 02-06-2014 |
20140270606 | SLIDE BEARING, SLIDE BEARING UNIT WITH SAME, AND MOTOR WITH THE BEARING UNIT - A bearing capable of satisfying demands for cost reduction and further quietness, and stably maintaining high support accuracy. A sliding bearing ( | 09-18-2014 |
20140314350 | ROTATING DEVICE - A rotating device includes a shaft body having a shaft, a first flange extending in the radial direction from the side face of the shaft, and a second flange extending outwardly of the radial direction from another end side, a freely rotatable bearing body including a shaft encircling member present between the second flange and the first flange in the axial direction, a radial dynamic pressure generating groove provided in either one of the shaft and the shaft encircling member, a first thrust dynamic pressure generating groove provided in either one of the first flange and the shaft encircling member, and a lubrication medium. An end of the region where the radial dynamic pressure generating groove is formed and which is distant from the second flange is located outwardly of the region where the first thrust dynamic pressure generating groove is disposed in the axial direction. | 10-23-2014 |
20140376840 | GROOVED LIMITER - Provided herein is an apparatus, including a stationary component and a rotatable component; a fluid between the stationary component and the rotatable component; a limiter shoulder of the stationary component; a flanged limiter bushing of the rotatable component; and a separating means for separating the limiter shoulder and the limiter bushing, wherein the separating means comprises the fluid. | 12-25-2014 |
20140376841 | 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. | 12-25-2014 |
20150086142 | ROTATING DEVICE - A rotating device includes a shaft body including a portion extending in an axial direction, and a bearing body which retains a part of the shaft body, is relatively rotatable to the shaft body, and is provided with a groove formed part having an inner circumference formed with a fluid dynamic pressure generating groove. The bearing body includes, at the groove formed part, a slanted plating layer having a plating thickness gradually becoming thick toward an external side in the axial direction. | 03-26-2015 |
20160097426 | DRAIN PROOF BEARING ASSEMBLY - A drain proof bearing assembly includes a seat; a cylindrical bearing being receivable in a hollow space of the seat; the bearing being formed with an axial hole; an upper opening of the axial hole of the bearing being formed with an annual recess for receiving a drain proof ring; a plurality of radial notches being formed radially on an upper surface of the bearing; an outer surface of the bearing being formed with a plurality of oil guiding trenches; by the notches, the oil guiding trenches being communicated to the annular recess; and a press plate having an inner hollow penetrating hole and receivable in the hollow spate of the seat. Thereby, the fluid is prevented from draining out along the path from the spindle to the press plate. This design is effective from various kinds of bearings, such as fluid dynamic bearings, or oil bearings, etc. | 04-07-2016 |