Abstract: An oil film is formed in a radial bearing clearance of a first radial bearing portion (R1) and a second radial bearing portion (R2) so as to rotatably support a shaft member (2). A bearing sleeve (8) and the shaft member (2) are accommodated in a housing (7), and the housing (7) has an inner space filled with a lubricant oil and has an opening sealed by a seal member (9). A first seal space (S1) is formed by means of an inner peripheral surface (9a2) of the seal member (9). The housing (7) and the seal member (9) are formed through injection molding of a resin.

Abstract: A hydrodynamic bearing assembly according to an aspect of the invention may include: 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 oil sealing unit having a first oil interface provided between the hub base and a counterpart component arranged downwardly in the axial direction; and a second oil sealing unit communicating with the first oil sealing unit through a communication channel and being tapered to form a second oil interface inside or outside the sleeve, wherein oil in the first oil sealing unit moves toward the second oil sealing unit along an inner diameter direction by a rotation of the rotor case.

Abstract: A fluid dynamic bearing apparatus includes shaft member 2, housing 7, sleeve portion 8, and sealing portions 9, 10. The housing 7 includes a straight cylindrical inner circumferential surface with a constant diameter and openings at both axial ends thereof. The sleeve portion 8 is provided separately from the housing 7 and fixed to the inner circumferential surface of the housing 7. A radial bearing gap is formed between the inner circumferential surface 8a of the sleeve portion 8 and the outer circumferential surface 2a of the shaft member 2 , and thrust bearing gaps are formed between the end faces 9b, 10b of the sealing portions 9, 10 and the end faces 8b, 8c of the sleeve portion 8 opposing these to support the shaft member 2 in a non-contact manner in the radial direction and in the thrust direction by the hydrodynamic effect of a lubricating oil produced in each bearing gap.

Abstract: A suspension strut includes a suspension strut bearing and a deflector seal. The suspension strut bearing has an upper portion mounted above a lower portion and a bearing seal mounted therebetween. The upper portion does not rotate with a steerable assembly while the lower portion does, with the upper portion including a lower surface adjacent to a seal opening. The deflector seal is elastomeric and is a toroidal shape, having a radially inner portion and a radially outer portion. The inner portion is secured against the lower portion of the strut bearing, and the outer portion is cantilevered outward from the inner portion to allow for elastic flexing of the outer portion. The outer portion allows for upward elastic flexing into contact with the lower surface of the upper portion of the strut bearing when a fluid or contaminant impinges upon a lower surface of the outer portion.

Abstract: A bearing apparatus includes a shaft, a thrust cup including an annular potion and a cylindrical portion, a rotating member including a through hole defined therein, and a lubricating oil. A second gap defined between a lower surface of the rotating member and an upper surface of the annular portion of the thrust cup includes a first region in communication with a capillary seal portion, and a second region positioned radially inward of the first region and having an axial dimension smaller than that of the first region. A lower end portion of the through hole is open at a location radially outwardly away from a boundary between the first and second regions, so that a local circulation of the lubricating oil arises within the first region during rotation of the rotating member.

Abstract: A bearing chamber apparatus (2) comprising a bearing chamber (4) having one or more seals (7) which seal an interior (5) of the chamber from an exterior (24) of the chamber; and further comprising: a pump in fluid communication with the interior of the chamber; and a controllable valve (20) in fluid communication with the interior of the chamber and the outside atmosphere. The arrangement allows oil leakage from the bearing chamber to be prevented and also allows a minimum pressure to be maintained within the bearing chamber.

Abstract: A resilient (slide) bearing device, for example for use in connection with support of a rotating element in a vessel, where the bearing insert comprises devices for gradual absorption of loads to which the bearing is exposed. This is achieved by the devices for gradual absorption of loads comprising two or more elastic elements with different modulus of elasticity, where the elements are furthermore placed in layers. A method for maintenance and service of the device is also presented.

Abstract: A fluid dynamic bearing having at least one first bearing part as well as a second bearing part that are rotatably supported with respect to one another about a rotational axis and separated from one another by a bearing gap filled with bearing fluid. Associated bearing surfaces of the bearing parts form a first and a second radial bearing that are marked by grooved bearing patterns disposed on at least one bearing surface. Between the radial bearings, there is a separator gap having an enlarged gap distance compared to the bearing gap. The ends of the grooved bearing patterns of the radial bearings adjoining the separator gap penetrate into the separator gap. This measure prevents the creation of negative pressure at the ends of the grooved bearing patterns, as a result of which the formation of air bubbles is also reduced.

Abstract: There is provided a bearing assembly and a motor including the same, bearing assembly including: a shaft including a first magnet provided thereon; a sleeve including a second magnet provided therein and disposed to face the first magnet so as to support the shaft; and a damping part disposed at a position at which the first and second magnets have maximum magnetic flux density in order to damp vibrations of the first and second magnets.

Abstract: The present invention provides a spindle motor which has superior operating characteristics. The spindle motor includes a stationary support shaft which is fastened to a base plate, a thrust plate which is fitted over the stationary support shaft, a sleeve which is rotatably provided around the stationary support shaft and is coupled to a rotor casing, and an annular stopper which is fastened to the sleeve or the rotor casing to support the lower surface of the thrust plate and prevent the sleeve from being removed. A first fluid sealing part is formed between the stopper and the thrust plate. The spindle motor further includes an annular sealing cap which is coupled to the sleeve or the rotor casing to store fluid between the sealing cap and an upper surface of the sleeve. A second fluid sealing part is formed between the sealing cap and the stationary support shaft.

Abstract: An oil sealing structure of a motor includes a cover and at least one sealing element. The motor has a shaft, a fluid bearing and a bushing. The fluid bearing mounts to the shaft and is accommodated in the bushing. The cover is disposed around the shaft and is connected with an opening of the bushing. The sealing element is disposed around the shaft and between the fluid bearing and the cover. A fan and a motor including the above-mentioned oil sealing structure are also disclosed.

Abstract: 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 39 opposite a circular plate 35 and a stopper 33 to attract a working fluid from inner and outer edges of the thrust bearing portion 39 to a radially midway portion thereof as a shaft member 16 rotates relative to a support 22. One or more through-holes 48 are provided between inner edges of annular regions of the thrust surfaces in which the pressure-generating grooves are provided and the midway portion in the radial direction. The through-holes extend through the thrust bearing portion 39 in a central-axis direction of the shaft member.

Abstract: In a bearing apparatus, a first cup portion defining a portion of a stationary portion of a bearing apparatus includes a circular plate portion and a cylindrical portion projecting downward from an outer edge portion of the circular plate portion. A rotating portion of the bearing apparatus includes an annular recessed portion arranged to accommodate at least a lower end portion of the cylindrical portion. Accordingly, it is possible to limit the axial dimension of the bearing apparatus while also enabling both a radial dynamic pressure groove array and a pumping groove array to have a sufficient axial dimension. Additionally, one end of a through hole defined in the rotating portion is arranged to open into the annular recessed portion, so that any air bubbles introduced into a lubricating oil by the pumping groove array can be efficiently caused to flow downward through the through hole and out of the bearing apparatus.

Abstract: An exemplary assembly includes a turbocharger center housing with a bore; a turbocharger bearing with an annular groove having a diameter; and a substantially planar spring, seated at least partially in the annular groove for positioning the turbocharger bearing in the bore of the housing, where the spring includes a first end and a second end, a free standing inner diameter, a plurality of straight sections tangent to the free standing inner diameter and disposed between the first end and the second end and a curved section disposed between two of the straight sections where the spring balances an inward radial bias with an outward radial bias to reduce contact between the bearing and the housing and variation in a squeeze film thickness. Various exemplary springs, bearings, housings, assemblies, etc., are also disclosed.

Abstract: Peeling-off of an oil-repellent film can be reliably prevented. A fluid dynamic bearing device (1) includes a shaft member (2) and first and second flange portions (9, 10) serving as seal portions fixed to the shaft member (2). On outer peripheral sides of the first and second flange portions (9, 10), a first seal space (S1) and a second seal space (S2) are formed, respectively. Oil-repellent films (11) are provided on end surfaces of the first flange portion (9) and the second flange portion (10) separately from a pressure-receiving surface (12) subjected to pressure at a time of assembly, the end surfaces being exposed to external air.

Abstract: A contoured region is disposed within a capillary buffer of a Fluid Dynamic Bearing. In one embodiment, the contoured region comprises at least one defined edge for arresting the displacement of a lubricant within the capillary buffer.

Abstract: In one example, a fluid dynamic bearing motor having a shield member is provided. In one example, the method includes disposing a first member and a second member for relative rotation about an axis of rotation. An annular shield member is attached to the first member, the shield member disposed adjacent a fluid reservoir for containing a bearing fluid. The reservoir is filled through an aperture (e.g., a fill hole) in the shield member. Thereafter, the aperture is at least partially sealed. The aperture may be hermetically sealed via one or more laser pulses. In other examples, a two piece shield is provided for shielding a reservoir without a fill hole.

Abstract: An exemplary anisotropic member supports a semi-floating bearing in a bore and can reduce non-synchronous vibration of the bearing in the bore. An anisotropic member can include an annular body configured to receive a semi-floating bearing and to space the bearing a distance from a bore surface and can be configured to impart anisotropic stiffness and damping terms to the semi-floating bearing when positioned in the bore. Such a member is suitable for use in a rotating assembly for a turbocharger where the bearing may be a semi-floating bearing. Various exemplary members, bearings, housings, assemblies, etc., are disclosed.

Abstract: A fluid dynamic pressure bearing device includes a shaft, an annular member, and a rotating member. The annular member is fixed to or seamlessly defined with the shaft and is radially opposed to the rotating member. The annular member and the rotating member are covered with a seal member. A first gap is defined between the seal member and the annular member. A second gap is defined between the rotating member and the seal member. A third gap is defined between the annular member and the rotating member. The first gap preferably has a width smaller than that of the second gap but greater than that of the third gap.

Abstract: Disclosed herein is a bearing unit including a shaft; a radial bearing for supporting the outer circumferential surface of the shaft; a housing for accommodating the radial bearing, the housing having an open end from which the shaft is inserted and a closed end opposite to the open end in the axial direction of the shaft; a lubricating oil filled in the housing to reduce rotational friction of the shaft; a holding member provided at the open end of the housing for holding the lubricating oil; and a sealing member for closing the open end of the housing to prevent the leakage of the lubricating oil; wherein the sealing member having a side wall portion interposed between the holding member and the shaft and opposed to the outer circumferential surface of the shaft.

Abstract: An exemplary anisotropic member (625, 1200, 1600, 1700, 1800, 1950) supports a bearing in a bore and can reduce non-synchronous vibration (NSV) of the bearing in the bore. An exemplary anisotropic member includes an annular body configured to receive a bearing and to space the bearing a distance from a bore surface and is configured to impart anisotropic stiffness and damping terms to the bearing when positioned in the bore. Such a member is suitable for use in a rotating assembly for a turbocharger where the bearing may be a floating bearing, a semi-floating bearing or a ball bearing. Various exemplary members, bearings, housings, assemblies, etc., are disclosed.

Abstract: A compliant hybrid gas journal bearing includes compliant hybrid bearing pads having a hydrostatic recess and a capillary restrictor for providing a flow of pressurized gas to the bearing. The bearing also includes an inner rim adjacent the bearing pads, an outer rim and a damper bridge between the inner and outer rims. The damper bridge has an axial length that is less than an axial length of the bearing pads and the outer rim to form a damper cavity on each side of the damper bridge. An integral wire mesh damper is situated within the damper cavity on each side of the damper bridge. Integral centering springs are located between the inner and outer rims to provide radial and rotational compliance to the bearing pads. The oil-free bearing design addresses the low damping and low load capacity characteristics that are inherent in present day compliant air foil bearing designs, while retaining the compliance to changes in rotor geometry.

Abstract: 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.

Abstract: An outer rotor motor has a bearing housing with reduced machining and material costs, can be assembled with high accuracy, and has favorable durability. A bearing is attached to an inner circumferential surface of a housing main body that has been formed in a cylindrical shape by plastic deformation caused by press molding a metal matrix. At least one protruding surface is formed by plastic deformation so as to protrude further outward than the housing main body, and the stator core is attached to the outer circumference-side of the at least one protruding surface.

Abstract: A fluid bearing device (50B, 50AB) is composed of a shaft (1, 51); a sleeve (9, 59) into which the shaft (1, 51) is inserted; and lubrication fluid (20) intervening in a gap between the shaft (1, 51) and the sleeve (9, 59), the fluid bearing device (50B, 50AB) supporting the shaft (1, 51) so as to be relatively rotatable freely with respect to the sleeve (9, 59), wherein an end portion of the sleeve (9, 59) is provided with a taper ring (4, 54) in annular shape, wherein at least either one of an inner circumferential surface (4a, 54a) of the taper ring (4, 54) and an outer circumferential surface (1a, 91b) of the shaft (1, 51) facing towards the inner circumferential surface (4a, 54a) of the taper ring (4, 54) is formed into a tapered surface (4a, 54a), which inclines in a direction as a gap between the inner circumferential surface (4a, 54a) of the taper ring (4, 54) and the outer circumferential surface (1a, 91b) of the shaft (1, 51) widens in accordance with leaving from the sleeve (9, 59) and forms a tape

Abstract: A hydrodynamic bearing type rotary device is configured to prevent air from being trapped inside a bearing and causing the bearing to have oil film rupture and NPPR to deteriorate. In the device, a flange having a shape substantially like a disc is provided integrally with a shaft near its lower portion. A sleeve having a bearing hole is fitted to the shaft so as to be relatively rotatable. Hydrodynamic grooves are provided on at least one of an outer periphery of the shaft and an inner periphery of the sleeve. The flange forms a thrust bearing surface with a lower end surface of the sleeve. Hydrodynamic grooves are provided on at least one of the lower surface of the sleeve and an upper surface of the flange. During rotation of the bearing, the hydrodynamic grooves circulate the lubricant. Capillary pressures at respective portions in the lubricant circulation path have different magnitudes.

Abstract: A bearing unit for a disk drive device is formed by a sleeve concave portion and a shaft concave portion, and is provided with a capillary seal portion in which the gap between the sleeve concave portion and the shaft concave portion is increased in diameter toward the hub side of the sleeve. Assuming that: the outer circumferential diameter at the tilt starting end on the base member side of the shaft concave portion is D0; the inner circumferential diameter at the tilt starting end on the hub side of the sleeve concave portion is D1; the facing outer circumferential diameter of the shaft concave portion, which faces, in the radial direction, the inner circumference at the tilt starting end of the sleeve concave portion, is D2; and the diameter of the most concave inner circumference of the sleeve concave portion is D3, D2 is larger than D0, D3 is larger than D1, and the difference between D3 and D0 is larger than that between D0 and D2.

Abstract: Disclosed herein is a spindle motor having a plurality of sealing portions. The spindle motor includes a rotor hub for rotating a recording medium mounted thereon, a rotating shaft secured to the rotor hub and supporting the rotor hub, a sleeve for rotatably supporting the rotating shaft, and a sealing member. The sealing member is secured to the sleeve and coupled to a bearing portion between the rotating shaft and the sleeve, and provides a rotary side sealing portion and a stationary side sealing portion between the rotor hub and the sleeve. The rotor hub has a ring-shaped inner wall facing the sealing member. The sealing member has a shape of a hollow cylinder, at least part of an outer circumferential surface of the sealing member facing the ring-shaped inner wall and at least part of an inner circumferential surface of the sealing member facing the sleeve being inclined and thus gradually tapered.

Abstract: An exemplary spring for positioning a turbocharger bearing in a housing includes a free standing inner diameter, a free standing outer diameter and a substantially sinusoidal shape to provide an inward radial bias and to provide an outward radial bias wherein the spring balances the inward radial bias with the outward radial bias to thereby position a turbocharger bearing in a housing. Various exemplary springs, bearings, housings, assemblies, etc., are also disclosed.

Abstract: One embodiment of the present invention provides a motor comprising a stator portion including a bearing using lubricant oil; and a rotor portion having a rotation shaft rotatably supported by the bearing, an oil deflector configured to return back to the bearing the lubricant oil that has leaked toward one end portion of the rotation shaft from the bearing, and a hub attached so as to oppose the oil deflector with a clearance therebetween.

Abstract: To prevent air from being trapped inside a bearing and causing the bearing to have oil film rupture and NRRO to deteriorate. In a hydrodynamic bearing, a first lubricant reservoir is provided in a gap between a lower surface of a hub and a sleeve, and a second lubricant reservoir is provided in a gap between an outer peripheral surface of the sleeve and an inner peripheral surface of the hub or an inner peripheral surface of a stopper member fixed to the hub. If air enters inside such a hydrodynamic bearing, the air has to be discharged. For this purpose, the relationship in widths of the radial bearing gap, the maximum gap of the first lubricant reservoir under the lower surface of the hub and the maximum gap of the second lubricant reservoir on the sleeve outer peripheral surface, or the relationship in magnitudes of capillary forces thereof is adjusted.

Abstract: An apparatus and method are provided for a robust and shock resistant fluid dynamic bearing. A fluid sealing system with fluid pumping and capillary features provides increased reliability and performance for small form factor disc drive memory systems. Concerns of motor jog are addressed, jog being the rapid and repeated opening and closing of spaces between relatively rotatable components that can dispel oil from, or draw air into, these spaces. The fluid pumping capillary sealing system includes a fluid pumping groove with a rib portion and a slot portion for pumping fluid. The fluid pumping capillary sealing system also includes a capillary seal. In an aspect, a sweeping rib sweeps fluid toward the bearing. A truncated rib is situated adjacent to the sweeping rib, the truncated rib extending a shorter radial distance as compared to the sweeping rib and forming a plenum region.

Abstract: A fluid dynamic bearing having a hub, a sleeve, and a sealing arrangement comprising a first capillary seal substantially retaining a first fluid and a second capillary seal comprising a second fluid. The second capillary seal is located between the first capillary seal and an opening between the hub and the sleeve.

Abstract: A bearing structure which is cooperated with a shaft and is disposed in a bearing tube comprises an oil bearing and a cylindrical sealing member. The oil bearing has an axial hole. The shaft passes through the axial hole. The cylindrical sealing member covers a top surface and at least a portion of a sidewall of the oil bearing. The cylindrical sealing member has a through hole defined in its center. The shaft passes through the through hole.

Abstract: An inertial navigation system is provided. The system includes a sensor block, an outer shell that substantially surrounds the sensor block and a plurality of gas pads connected to the outer shell that float the sensor block in gas creating a near frictionless environment to allow the sensor block to rotate in all directions. Each of the plurality of gas pads is adapted to receive pressurized gas. The outer shell and the sensor block are separated by a gap created by the pressurized gas at each pad.

Abstract: An object of the present invention is to provide a hydrodynamic bearing type rotary device which can improve rotation performance, suppress a friction torque, and reduce power consumption of motor, and a recording and reproducing apparatus including the same. A shaft having a flange on one end and a hub on the other end is provided with a bearing of a sleeve so as to be rotatable. The sleeve includes a communication hole. A third gap between the hub and the sleeve end surface is a flow path, and is connected to the communication hole. Provided that a first gap between a thrust plate 4 and the flange 3 is S1, a second gap between the flange 3 and a lower end surface of the sleeve 1 is S2, and a third gap between the upper end surface of the sleeve 1 and the hub 7 is S3, widths of the gaps satisfy the relational expression, S3>(S1+S2).

Abstract: A fluid dynamic bearing mechanism for a motor (1) suitable for use in a hard disk drive and having a compact and thin shape, high bearing rigidity, and high rotating accuracy, and which securely keeps the rotor member (6) in place against shocks, and allows the inspection of lubricant supply amount easily. A fluid dynamic bearing mechanism having a capillary seal part (12) on one end of lubricant supply part formed by a minute gap including dynamic pressure grooves (10) formed on a shaft member (5) or a bearing member (4) is provided. An annular member (13) is fitted on the shaft member at the location corresponding to the capillary seal part, another annular member (14) is fitted on the bearing member at the location corresponding to the capillary seal part, a taper or step (13a, 14a) is formed on the outer peripheral surface of the annular member on the shaft member side and the inner peripheral surface of the annular member on the bearing member side.

Abstract: A bearing unit wherein a radial bearing for bearing a shaft in the circumferential direction of the shaft and a metallic housing provided with an attaching section are integrated with each other by molding, a resin molded body formed by the molding is so formed as to sealingly contain the radial bearing therein and is provided on one end side in the axial direction thereof with a shaft passing hole through which to pass the shaft, and the inside of the resin molded body is filled with a viscous fluid, whereby the viscous fluid such as a lubricating oil can be prevented from leaking, and the bearing unit can be attached to an object easily and assuredly.

Abstract: A tilting pad journal bearing, an annular housing for an array of arcuate bearing pads resiliently mounted by spring means which biases the pads against heads of restraining bosses that limit radial displacement and cause the bearing pads to define a shaft space. The pads have associated therewith support pegs secured to housing or pad at one end and movable relative to the pad or housing at the other, and the spring means comprises stacks of individually deflectable elements mounted between relatively moving pad, housing or peg and pre-loaded by adjusting the effective gap with the pads against the bosses. Relative movement between springs provide friction damping. The restraining bosses may be displaceable together to eliminate the shaft space clearance if the magnetic suspension fails or shows signs of failing.

Abstract: 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.

Abstract: 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.

Abstract: It is an object to improve bearing rigidity in a thrust direction at high temperatures and reduce a torque at low temperatures. An axial member is arranged in such a manner that an outer circumferential surface of an axial part is opposed to an inner circumferential surface of a bearing sleeve with a radial bearing gap interposed therebetween, and both end faces of a flange part are opposed to one end face of the bearing sleeve and a bottom face of a housing with thrust bearing gaps interposed therebetween, respectively. In this manner, the axial member is supported by dynamic pressures generated in the respective bearing gaps in the thrust direction in a non-contact manner. The flange part of the axial member is formed of a resin in such a manner that its linear expansion coefficient in its axial direction is equal to or larger than that of the housing.

Abstract: A fluid dynamic pressure bearing device includes a shaft, an annular member, and a rotating member. The annular member is fixed to or seamlessly defined with the shaft and is radially opposed to the rotating member. The annular member and the rotating member are covered with a seal member. A first gap is defined between the seal member and the annular member. A second gap is defined between the rotating member and the seal member. A third gap is defined between the annular member and the rotating member. The first gap preferably has a width smaller than that of the second gap but greater than that of the third gap.

Abstract: Centering rings may be used to modify the combined resonance of a rotor and its support assembly to migrate the rotor critical speeds such that they can be engineered out of the rotor operating speed range. The centering rings of the present invention may be useful for any rotating electrical machinery, especially high speed aerospace applications, such as generators and starter-generators.

Abstract: An oil sealing structure of a motor includes a cover and at least one sealing element. The motor has a shaft, a fluid bearing and a bushing. The fluid bearing mounts to the shaft and is accommodated in the bushing. The cover is disposed around the shaft and is connected with an opening of the bushing. The sealing element is disposed around the shaft and between the fluid bearing and the cover. A fan and a motor including the above-mentioned oil sealing structure are also disclosed.

Abstract: A hydrodynamic bearing type rotary device which allows bubbles in a lubricating fluid to be surely discharged from a bearing portion is provided. A hydrodynamic bearing mechanism 40 of the hydrodynamic bearing type rotary device is formed of a sleeve 1, a shaft 2, a flange 3, a thrust plate 4, a seal cap 5, and oil 6. A first fluid reservoir F is formed between the sleeve 1, the flange 3, and the thrust plate 4. A second fluid reservoir H is formed between the sleeve 1 and the seal cap 5. In the sleeve 1, a communication hole G extending along an axial direction is formed. The first fluid reservoir F and the second fluid reservoir H communicate with each other through the communication hole G. The oil 6 is filled between the members. A capillary pressure is higher in the first fluid reservoir F than in the second fluid reservoir H.

Abstract: A different-diameter clearance of high accuracy is created at low cost, thereby improving the bearing performance and the sealing capability. An inner periphery 5a of a molded part 5 having a step from an inner periphery 4a of an electroformed part 4 is molded to a nonconductive coating 9 which covers the surface of a master 8. When the nonconductive coating 9 is removed, a radial clearance 7 having a diameter greater than that of a bearing clearance 6 is created between the inner periphery 5a of the molded part 5, which is exposed to the interior, and an outer periphery 2a of a shaft member 2.

Abstract: The invention relates to an oil-leak proof bearing system, and the system includes a bearing, an oil-leak proof cover and a rotor shaft. The center portion of the oil-leak proof cover defines a through hole, and the inner wall defining the through hole is provided with at least one first guiding groove thereon extended obliquely downward from the upper edge of the inner side face to force oil dispersed by the rotor shaft to flow back into the bearing system. The bottom surface of the oil-leak proof cover, contacting the bearing, is provided with second guiding grooves extending radially approximately from the center thereof. The capillarity of the second guiding grooves guides the oil dispersed by the rotor shaft to flow radially. The design of the first and second guiding grooves prevents the bearing system from leakage of lubricating oil, and provides a closed oil loop for operation.

Abstract: A fluid dynamic bearing device capable of exercising high bearing performance is provided at low cost. A housing 7 is injection molded with a bearing sleeve 8 as an insert. Accordingly, the molding of the housing 7 and the assembly of the housing 7 and the bearing sleeve 8 can be performed in a single step. In addition to this, by simply increasing the die precisions the housing 7 and the bearing sleeve 8 can be fixed easily with high precision. Since the housing 7 is opened at both ends, it is possible to sandwich the bearing sleeve 8, and accordingly, the bearing sleeve 8 can be accurately positioned inside the dies with reliability.

Abstract: A hydrodynamic bearing having a bearing sleeve, a rotational shaft supported for rotation by the bearing sleeve, a bearing gap formed between the bearing sleeve and the rotational shaft, lubricating oil contained within the bearing gap, at least one hydrodynamic pressure-generating groove formed at an inner peripheral surface of the bearing sleeve; and an oil reservoir. The oil reservoir includes a gradually expanding section located in a position distanced from the pressure-generating groove and a first larger inner diameter, section located adjacently to the gradually expanding section. A second larger inner diameter section is located immediately below an opening of the bearing sleeve and an oil-repelling peripheral groove located between the first larger inner diameter section of the oil reservoir and the second larger inner diameter section.