Abstract: To increase fixation strength of a bearing sleeve with respect to a bottomed cylindrical housing, a fluid dynamic bearing device (1) is provided with a bottomed cylindrical housing (7), a bearing sleeve (8) fixed to an inner periphery thereof, and a shaft member (2) inserted along an inner periphery of the bearing sleeve (8). An adhesive pool (11) is provided between an inner peripheral surface (7a2) of a smaller diameter portion (7a) of the housing (7) and an outer peripheral surface (8d) of the bearing sleeve (8), which are opposed to each other. Further, an inner peripheral chamfer (7f) continuous with the adhesive pool (11) is provided on an inner peripheral portion of the housing (7), and a first tapered space (12) formed between the inner peripheral chamfer (7f) and the bearing sleeve (8) is sealed with an adhesive (13).

Abstract: A sleeve supports a shaft. A housing member is arranged so as to surround the sleeve and make the end of the sleeve protrude. A base member holds the housing member and fixes a stator core so as to surround the housing member. A hub drives a recording disk by being rotated integrally with the shaft, with a magnet being fixed to an annular portion concentric with the shaft so as to face the stator core fixed to the base member. A thrust member is rotated integrally with the hub, and a descender portion and a ring portion.

Abstract: Disclosed herein is a hydrodynamic bearing module including: a hydrodynamic bearing part formed by filling oil in a micro-clearance between a rotating part and a fixed part including a sleeve; a first radial dynamic pressure bearing part formed in a micro-clearance between an inner diameter portion of the sleeve and the rotating part; a second radial dynamic pressure bearing part formed in a micro-clearance between an outer diameter portion of the sleeve and the rotating part; and a thrust dynamic pressure bearing part formed between the sleeve and the rotating part and positioned between the first and second radial dynamic pressure bearing parts.

Abstract: The fluid dynamic bearing assembly of including: a sleeve formed to have a hollow into which a shaft is inserted; a sleeve housing formed to insert the sleeve therein; a bypass passage formed to axially communicate the upper portion and the lower portion of the sleeve between the sleeve and the sleeve housing and dispersing pressure of a lubricating fluid in the hollow; an oil sealing cap having an oil passage communicated with the bypass passage and taper-sealing the lubricating fluid within the oil passage; and a thrust plate formed to have a hole corresponding to a shape of the outer peripheral surface of the shaft and axially disposed under the sleeve.

Abstract: A fluid dynamic bearing device (21) includes: a shaft member (22); a housing (29) as an outer member which is arranged on a radially outer side of the shaft member (22) and is opened at both ends; a radial bearing gap which is formed on a radially inner side of the housing (29) and faces an outer peripheral surface of the shaft member (22); and a lid member (30) closing an opening on one end side of the housing (29), wherein the lid member (30) is fitted to an outer peripheral surface of the housing (29) with a fastening allowance which does not affect accuracy of a surface defining an outer diameter dimension of the radial bearing gap so that the housing (29) and the lid member (30) are bonded and fixed to each other.

Abstract: There are provided a rotating member assembly and a spindle motor including the same. The rotating member assembly includes: a rotating member including a shaft and a hub fixed to an upper portion of the shaft, wherein perpendicularity of the hub with regard to the shaft at a position spaced apart from the center of rotation of the shaft in an outer diameter direction by an axial length or more for which the shaft is fitted into the sleeve is less than double a distance of a gap of a bearing clearance formed by fitting the shaft into the sleeve.

Abstract: A rotating device includes a sleeve which encircles a shaft, a housing which supports the shaft and which forms an annular supporting recess where the lower end of the sleeve enters together with the shaft, a ring member which is provided above the sleeve and which is fixed to the shaft in a manner encircling the shaft. A first gap between the sleeve and the shaft includes first and second radial dynamic pressure generating portions. An annular sleeve recess is formed in upper face of the sleeve. The ring member includes a ring entering portion that enters the sleeve recess in a non-contact manner. An outward gap in the radial direction where the ring entering portion and the sleeve recess face with each other in the radial direction includes a second air-liquid interface of a lubricant.

Abstract: 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.

Abstract: In a disk drive device, a hub has an outer circumferential wall portion configured to hold a recording disk. A base member has a cylindrical portion, whose central axis is the rotation axis of the hub, on a surface on the side of the hub. A fluid dynamic bearing holds a lubricant and rotatably supports the hub relative to the base member. A ring-shaped attraction plate including a magnetic material is fixed to the base member and faces a magnet in the axial direction. The outer circumferential wall portion is configured such that the outer circumferential wall portion surrounds the attraction plate and that the range of the outer circumferential wall portion in the axial direction overlaps with the range of the attraction plate in the axial direction.

Abstract: A groove configuration for 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.

Abstract: There is provided a spindle motor including: a sleeve rotatably supporting a shaft; a sleeve holder supporting the sleeve and formed through a pressing process; a stator core fixedly mounted on an outer circumferential surface of the sleeve holder; and a pulling magnet fixedly mounted on an upper surface of the stator core, wherein the stator core includes a burr insertion stepped part formed in a lower portion of an inner diameter portion thereof.

Abstract: The invention provides a supercharger which is provided with a thrust bearing in an outer side of a radial bearing, and can smoothly discharge a fed lubricating oil from a bearing portion so as to reduce a resistance generated by the lubricating oil. The supercharger is provided with a thrust bearing (30) rotatably supporting a thrust force applied to a turbine shaft (12). The thrust bearing (30) is constituted by a disc-shaped thrust collar (32) rotating together with the turbine shaft, and a turbine side thrust bearing (34) and a compressor side thrust bearing (36) inhibiting a movement in an axial direction of the thrust collar.

Abstract: A flatness of a part of a component formed of a resin material that faces a thrust bearing gap is easily increased. A housing (7) is injection-molded using a resin material and has a bottomed-cylindrical shape integrally including a cylindrical side portion (7a) and a flat bottom portion (7b). The resin material to be used for the injection molding of the housing (7) contains, as filler, a reinforcing fiber having a fiber diameter of 6 to 8 ?m and an aspect ratio of 10 to 40.

Abstract: A fluid dynamic bearing includes: a shaft arranged along a center axis; an annular portion expanding radially outwards from the shaft; a sleeve having a top surface opposed to an under surface of the annular portion to support the shaft and the annular portion in a relatively rotatable manner; and a lubricating fluid interposed between the shaft and annular portion and the sleeve. The fluid dynamic bearing further includes a substantially annular edge surrounding the center axis on the under surface and a solid lubricating film on the radially outer side of the edge.

Abstract: 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 includes at least one fluid dynamic radial bearing and at least one fluid dynamic axial bearing that are disposed along sections of the bearing gap. In one aspect of the invention, an annular sealing gap for sealing open ends of the bearing gap 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.

Abstract: 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.

Abstract: The rotating device includes a fixing body having a shaft and a shaft holder fixing the shaft, a rotating body having a shaft encircling member with a cylinder part encircling a shaft and a disk part, and a middle encircling member encircling the cylinder part and facing the disk part via a clearance in the direction of a rotational axis, a radial dynamic pressure generating groove disposed in either one of a surface of the cylinder part and a surface of the shaft facing with each other in the radial direction, a thrust dynamic pressure generating groove disposed in either one of a surface of the disk part and a surface of the shaft holder facing with each other in the rotational axis direction, and a lubricant continuously present from a first air-liquid interface to a second air-liquid interface between the rotating body and the fixing body.

Abstract: A spindle motor and a hard disc drive including the same are provided. The spindle motor including: a rotary member; and a fixed member rotatably supporting the rotary member by fluid dynamic pressure, wherein upper radial dynamic pressure generating grooves and lower radial dynamic pressure generating grooves are formed in at least one of surfaces of the rotary member and the fixed member facing each other in a radial direction, and thrust dynamic pressure generating grooves are formed in at least one of surfaces of the rotary member and the fixed member facing each other in an axial direction. In the thin spindle motor, a burden of slope rigidity may be transferred from the radial bearing to the thrust bearing so that the rotary member can have slope rigidity enough to be returned to its original position, when the rotary member is sloped to one side.

Abstract: A bearing mechanism includes a shaft portion, a sleeve portion, and an opposing portion including a surface arranged opposite to an end surface of the sleeve portion on one of upper and lower sides with a thrust gap defined therebetween. The thrust gap includes a thrust dynamic pressure bearing portion defined therein. The sleeve portion includes a sleeve body and a thrust plate fixed to an end portion of the sleeve body on the one of the upper and lower sides. The sleeve body includes an annular surface arranged opposite to the thrust plate, and an annular body projecting portion arranged to project in an axial direction inside of the annular surface. An outer circumferential surface of the body projecting portion and an inner circumferential surface of the thrust plate are arranged to be in direct or indirect contact with each other.

Abstract: A bearing mechanism includes a shaft portion, a sleeve portion, a lower opposing portion, a lower outer annular portion, and an upper opposing portion. The sleeve portion includes a sleeve body and a lower thrust plate. A radial dynamic pressure bearing portion is defined in a radial gap. A lower thrust dynamic pressure bearing portion is defined in a lower thrust gap. A lower seal portion is defined in a lower seal gap located between the sleeve portion and the lower outer annular portion. An upper seal portion is defined in an upper seal gap continuous with an upper thrust gap. The sleeve portion includes a first communicating channel in communication with the upper seal gap, and a second communicating channel located between the sleeve body and the lower thrust plate. A lower mouth portion of the first communicating channel axially overlaps the lower thrust dynamic pressure bearing portion.

Abstract: 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.

Abstract: A bearing mechanism includes a shaft portion, a sleeve portion, a lower opposing portion, a lower outer ring-shaped portion, and an upper opposing portion. A lower seal portion serving as a pumping seal portion is provided in a lower seal gap between the sleeve portion and the lower outer ring-shaped portion. An upper seal portion is provided in an upper seal gap joined to an upper thrust gap. The lower portion of the sleeve portion includes a large-diameter portion and a small-diameter portion positioned below the large-diameter portion. The sleeve portion includes a communication path joined to the upper seal gap. The communication path includes an opening portion opened in a border between the large-diameter portion and the small-diameter portion. The outer peripheral portion of the lower opposing portion includes an outer periphery protrusion portion radially opposed to the small-diameter portion and axially opposed to the large-diameter portion.

Abstract: A fluid dynamic bearing device includes: a shaft member; a bearing sleeve which forms a radial bearing gap between the bearing sleeve and an outer peripheral surface of the shaft member; a housing which accommodates the bearing sleeve and is opened at both ends; and a lid member which closes an opening on one end side of the housing and forms thrust bearing portions. The housing is an injection-molded product into which the bearing sleeve is inserted, and the housing has another end with which a seal portion forming a seal space is integrally formed. The lid member is fitted with the outer peripheral surface of the housing by loose fitting so that the lid member and the housing are bonded and fixed to each other.

Abstract: 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.

Abstract: There is provided a spindle motor including: a lower thrust member fixedly attached to a base member; a shaft fixedly attached to at least one of the lower thrust member and the base member; a sleeve disposed on an upper portion of the lower thrust member and rotatably installed on the shaft; a rotor hub coupled to the sleeve to thereby rotate together therewith; and an upper thrust member fixedly attached to an upper end portion of the shaft and forming a liquid-vapor interface together therewith, wherein the sleeve has an inclination part formed at an upper end portion thereof so as to form the liquid-vapor interface together with the upper thrust member, the inclination part having an outer diameter larger in an upper portion thereof than in a lower portion thereof.

Abstract: A method of manufacturing a bearing mechanism of a motor includes steps a)-e). In step a), a bearing assembly is assembled. In step b), an upper seal gap between an upper thrust portion and an upper hub annular portion is arranged to face downward to increase the width of a gap between an outer tubular portion and a flange portion, or a lower seal gap between the outer tubular portion and a lower hub annular portion is arranged to face downward to increase the width of a gap between the upper thrust portion and the flange portion. In step c), pressure in all gaps is reduced. In step d), lubricating oil is injected into the upper or lower seal gap which faces upward, and a predetermined time or longer is allowed to pass. In step e), pressure is returned to atmospheric pressure.

Abstract: A fluid dynamic bearing including a bearing bush having a central bearing bore in which a shaft is rotatably supported. Surfaces of the shaft and of the bearing bore that face each other are separated from one another by a bearing gap filled with a bearing fluid. A first radial bearing section and a second radial bearing section are disposed along the bearing gap, between which a separator section is disposed. The width of the bearing gap varies with its axial length. The bearing gap has a first inner width ib1 and a second inner width ib2 in the region of the first and of the second radial bearing section on the sides facing the separator section, a first outer width ab1 and a second outer width ab2 on the sides remote from the separator section. According to the invention, the differences resulting from the inner widths and the outer widths, ib1?ab1 and ib2?ab2, lie in an interval of a?t to a+t, where a is greater than zero and t is greater than a.

Abstract: 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.

Abstract: A fluid dynamic bearing system having a first conical bearing and a second conical bearing working in opposition to the first conical bearing, wherein the two conical bearings are disposed along a stationary shaft, wherein the first and the second conical bearing each comprises a bearing cone disposed on the shaft having bearing surfaces as well as a conical counter bearing disposed in a rotor component that are separated from one another by a bearing gap filled with a bearing fluid, wherein the bearing gap has a first open end that is sealed by a first sealing gap partially filled with bearing fluid, wherein the bearing fluid in the sealing gap forms a fluid meniscus.

Abstract: A gap width out of the radial bearing gap is axially differed; a narrow width part which has a relatively smaller gap width in the radial bearing gap is arranged on the side relatively closer to a barycentric position of the rotating body, and a wide width part which has a relatively larger gap width in the radial bearing gap is arranged on a side relatively distant from the barycentric position of the rotating body; and a region facing at least the radial bearing gap of the bearing member is formed to an electroformed part made of deposited metal.

Abstract: A disk drive device includes a base plate, a hub, and a bearing unit. The bearing unit includes an outer sleeve, an inner sleeve, a shaft, a radial dynamic pressure groove, and a lubricant agent. In the joined portion of the outer sleeve and the hub, there are formed a recessed portion, which is a binding region, where the outer sleeve and the hub are joined together with a hardening resin present between the outer sleeve and the hub and a tilt preventing portion, provided on both the sides of the recessed portion in the axial direction of the outer, which is a raised region that forms a portion narrower than a gap, between the outer sleeve and the hub, corresponding to the recessed portion.

Abstract: A motor includes a stationary portion and a rotating portion. The stationary portion includes a shaft portion and an upper thrust portion. The upper thrust portion includes a tubular first outer circumferential surface arranged radially outside the upper thrust portion, and a tubular second outer circumferential surface arranged above the first outer circumferential surface. The rotating portion includes a sleeve portion, a tubular portion, and an annular cover portion. The annular cover portion includes a plate portion and an inner annular projecting portion arranged to project upward or downward. An inner circumferential surface of the inner annular projecting portion is arranged above an inner circumferential surface of the tubular portion. An upper seal portion includes a surface of a lubricating oil located therein.

Abstract: A positioning device includes a shaft tube having a receptacle receiving a support member that includes first and second ends spaced along an axis. The support member further includes a through-hole extending from the first end through the second end. A bearing is received in the receptacle and includes an end facing the first end of the support member. The end of the bearing includes an inclined pressing surface aligned with a support portion formed on the first end of the support member. The pressing surface deforms the support portion when the bearing is pushed downward during assembly. The deformed support is received in a groove between the pressing surface and an inner periphery of the receptacle to offset and absorb the downward pressing force. The bearing is, thus, reliably fixed in the desired assembly position while preventing the support member from being damaged or generating noise during operation.

Abstract: 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.

Abstract: There are provided a hydrodynamic bearing assembly and a spindle motor including the same. The hydrodynamic bearing assembly includes: a sleeve supporting a shaft and forming a bearing clearance between the sleeve and the shaft, the bearing clearance filled with a lubricating fluid; a housing partially enclosing an outer peripheral surface of the sleeve; a rotor hub coupled to the upper end portion of the shaft and including an extension wall part partially facing an upper end portion of the sleeve and partially extended to be disposed outwardly of the housing; a stopper provided on a lower end portion of the shaft to be protruded outwardly in a radial direction to be caught by a lower end portion of the sleeve; and a circulation hole provided between the sleeve and the housing to allow a lower portion of the sleeve to communicate with an upper end portion of the housing.

Abstract: 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 (1) includes radial bearing parts (R1 and R2) and thrust bearing parts (T1 and T2). Thrust bearing surfaces (C and D) are respectively provided to first and second step surfaces (2d and 2e) of a housing (2), and the thrust bearing parts (T1 and T2) are respectively formed between the thrust bearing surfaces (C and D) and end surfaces (6b and 7b) of seal members (6 and 7) provided while protruding to an outer diameter side of a shaft member (5).

Abstract: 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.

Abstract: A molding pin (23) is formed in a sectional shape of being held in contact at two points (contact points are denoted by P?) with an imaginary cylindrical surface (C?). As a result, an undercut of a fixation hole (21b1) is reduced or eliminated, and hence it becomes easier to process a die. Moreover, a corner portion (21d) between a cylindrical surface (21c) and the fixation hole (21b1) becomes obtuse, and hence the die becomes less liable to deform and break. Therefore, manufacturing cost of the die can be reduced, and hence cost reduction of the bearing device can be achieved.

Abstract: The present invention has an object of improving wear resistance of a thrust bearing portion. A pressure is generated by a dynamic pressure effect of a lubricating oil in a thrust bearing gap between a thrust bearing surface including dynamic pressure generating grooves and a smooth thrust receiving surface so as to rotatably support a shaft member in an axial direction. The thrust receiving surface is formed as a flat surface, whereas an inclined plane is provided on the thrust bearing surface so as to provide a reduced portion having a decreasing axial width in a radially outward direction in the thrust bearing gap.

Abstract: 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.

Abstract: There is provided a hydrodynamic bearing assembly including: a sleeve against which a shaft is supported so that an upper end of the shaft, being compressed and inserted into a hub base of a rotor case, protrudes upwardly in an axial direction; a first thrust dynamic pressure generating part formed in at least one of a protrusion and the hub base corresponding to the protrusion, the protrusion being formed at an end of the sleeve along an inner diameter direction; and a second thrust dynamic pressure generating part formed around a protruding end portion of the sleeve, the protruding end portion facing an upper portion of a stopper part in the axial direction and the stopper part rotating together with the rotor case. Also, an oil sealing part has an oil interface between an outer circumferential surface of the sleeve along an outer diameter direction and an inner surface of the stopper part.

Abstract: With use of a fine copper-based powder, specifically a copper-based powder that contains particles each having a diameter of 45 ?m 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.

Abstract: Disclosed herein is a hydrodynamic bearing module including: a shaft having a flange part formed at a lower portion thereof; a sleeve rotatably supporting the shaft; a cover coupled to a lower end portion of the sleeve and supporting the shaft; a radial bearing formed between the shaft and the sleeve in a radial direction of the shaft; and an upper thrust bearing formed between the flange part and the sleeve and a lower thrust bearing formed between the flange part and the cover, in an axial direction of the shaft.

Abstract: 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.

Abstract: There are provided a hydrodynamic bearing assembly and a motor including the same. The hydrodynamic bearing assembly includes: a sleeve supporting a shaft and forming a bearing clearance filled with a lubricating fluid; a housing enclosing an outer peripheral surface of the sleeve and including a flange part formed in an upper end portion thereof and extended outwardly; a rotor hub coupled to an upper end portion of the shaft and including an extension wall part extended to be disposed outwardly of the housing; a stopper member fixed to the extension wall part while being disposed under the flange part of the housing, and forming, together with an outer peripheral surface of the housing, a space in which a liquid-vapor interface is formed; and a cover member coupled to a lower end portion of the housing. The sleeve and the housing include first and second circulation holes formed therebetween.

Abstract: There is provided a spindle motor including: a base part having a lower end portion of a shaft fixed thereto; a rotating member rotatably installed with respect to the shaft and forming a bearing clearance with the shaft, the bearing clearance being filled with a lubricating fluid; a coupling member fixedly installed on the rotating member and including an inclined surface allowing an interface between the lubricating fluid filling the bearing clearance and air to be formed; and an upper thrust member fixed to the shaft so as to form the interface between the lubricating fluid and air, with the coupling member.

Abstract: According to various embodiments of the invention, a motor with a rotatable hub having fluid dynamic journal and thrust bearings can be assembled from four major components: a spindle, a hub, a thrust washer, and a base. The spindle can integrate journal bearing, axial limiter, and ring seal functions. The hub can integrate journal bearing, thrust bearing, ring seal, axial limiter, capillary seal, and bumper functions. The thrust washer can integrate thrust bearing and lubricant circulation functions. The base can integrate capillary seal and lubricant storage and circulation functions. Each function can be integrated as structural feature in its corresponding component. The spindle, hub, and thrust bearing can be preassembled. The base can be loaded with lubricant prior to assembly with the spindle/hub/thrust bearing combination.

Abstract: A first axial gap (L1) is formed between a seal portion (9) and a sleeve portion (8). With this, it is possible to set a moving amount of a shaft member (2) in an axial direction with high accuracy irrespective of accuracy of members such as the sleeve portion (8).

Abstract: 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.

Abstract: A bearing device with an arrangement of at least two bearings is provided. A filling made of an amorphous/solid active medium as a mechanism of compensating for axial loads is arranged between a bearing race of at least one of the bearings and a surrounding component of the bearing arrangement.