JP4794966B2 - Bearing device, motor provided with the same, and method for manufacturing bearing device - Google Patents

Description

  The present invention relates to a bearing device provided with a sliding bearing.

  BACKGROUND ART A bearing device provided with a sliding bearing (hereinafter simply referred to as “bearing”) is widely used in applications that support relative rotation, sliding, or sliding rotation between a bearing and a shaft member.

As such a bearing device, for example, Patent Document 1 proposes a bearing device including a bearing component that is molded by inserting an electroformed part formed by electroforming into an axis of a resin molded part. Thus, by forming the inner peripheral surface of the bearing serving as the bearing surface by electroforming, a bearing surface having excellent wear resistance can be obtained and formed between the shaft member inserted into the inner periphery. The bearing gap can be set with high accuracy.
JP 2003-56552 A

  When the bearing device as described above is used, for example, to support a rotating shaft of a spindle motor for driving a magnetic disk of an HDD that requires high speed rotation and high rotation accuracy, lubrication between the bearing and the shaft member is improved. Therefore, oil lubrication may be necessary.

  However, the bearing gap between the inner circumferential surface of the bearing and the outer circumferential surface of the shaft member is set to a gap width as small as possible in order to suppress the shakiness of the shaft member. The amount of is very small. For this reason, if the lubricating oil is reduced due to scattering, evaporation, etc., it causes a lubrication failure due to insufficient lubricating oil, and causes problems such as generation of abnormal noise and wear of the member due to contact sliding between the bearing and the shaft member.

  An object of the present invention is to provide a bearing device having a sliding bearing with good lubrication between the bearing and the shaft member, which prevents generation of abnormal noise and wear of the member, and has a long product life.

To solve the above problems, a bearing device of the present invention is deposited formed on the outer peripheral surface of the master axis, the electroformed portion having a bearing surface on the inner periphery, electroformed part is molded by insert to the inner periphery of the resin And a shaft member inserted in the inner periphery of the electroformed part , a bearing gap formed between the bearing surface and the outer peripheral surface of the shaft member , filled with lubricating oil, and held in the base material And an annular auxiliary oil supply member for supplying the oil to the bearing gap, and the bearing surface is formed of a surface that starts to precipitate on the surface of the master shaft, and is formed by deposition on the outer peripheral surface of the master shaft and the master shaft. And the resin part which hold | maintains an electroformed part and a supplementary oil member in an inner periphery is injection-molded by resin as an insert part about the supplementary oil member arrange | positioned on the outer periphery of a master axis | shaft, It is characterized by the above-mentioned .

  As described above, the bearing device of the present invention includes the oil filler member that supplies oil to the bearing gap. As a result, the oil retained in the bunkering member is supplied to the bearing gap, so that the bearing device operates smoothly by the oil film formed in the bearing gap, the generation of abnormal noise due to poor lubrication, the bearing and the shaft member Wear due to contact sliding can be avoided. In addition, by supplying oil from the oil filler member, it is possible to supply an extremely small amount of oil by a capillary phenomenon, so that an appropriate oil film can be formed in the bearing gap over a long period of time.

  When the oil filler member is provided at a position in contact with the shaft member, oil can be easily supplied to the bearing gap, and smoother lubrication can be obtained. On the other hand, if the oil supply member is provided at a position not in contact with the shaft member and oil is supplied to the bearing gap through the communication hole, the surface of the bearing surface is not eroded by the oil supply member, and the bearing performance is reduced. Can be avoided.

  Since the motor including the bearing device, the rotor magnet, and the stator coil as described above operates smoothly, no abnormal noise is generated and the product life is long.

  As described above, in the bearing device of the present invention, since the lubrication between the bearing and the shaft member is good, the generation of abnormal noise and the wear of the member can be prevented, and the rotation speed can be increased and the product life can be extended.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings.

  FIG. 1 is a cross-sectional view of a bearing device 1 according to a first embodiment of the present invention. The bearing device 1 includes a bearing 3, a shaft member 2 inserted on the inner periphery of the bearing 3, and a lubricating oil member 6. The bearing 3 includes an electroformed part 4 formed by electroforming, and a resin part 5 that holds the electroformed part 4 on the inner periphery.

  Hereinafter, the manufacturing process of the bearing 3 will be described. The bearing 3 is formed by masking a required portion of the master shaft 7 and forming an electroformed shaft 9 by performing electroforming or the like on an unmasked portion (see FIGS. 2 and 3). The parts 4 are manufactured through a process of injection molding the resin 4 with a resin (see FIG. 4) and a process of separating the electroformed part 4 from the master shaft 7 and separating the bearing 3 and the master shaft 7.

  In the following description, the “rotating bearing” means a bearing that supports relative rotation with the shaft member, and it does not matter whether the bearing is on the rotating side or the fixed side. “Sliding bearing” means a bearing that supports relative linear motion with respect to the shaft, and it does not matter whether the bearing is on the moving side or the stationary side. The “rotating and sliding bearing” has both functions of the two bearings, and means a bearing that supports both rotational motion and linear motion between the shafts. Further, the “oscillating bearing” means a bearing that allows movement in the three-dimensional direction of the shaft, such as a ball joint.

  The master shaft 7 is made of a conductive material, for example, hardened stainless steel, and is manufactured as a straight shaft having a circular cross section. Of course, the material is not limited to stainless steel, and the mechanical function such as rigidity, slidability, heat resistance, chemical resistance, workability and peelability of the electroformed part 4, etc. A material and a heat treatment method suitable for the characteristics required above are selected. Even non-metallic materials such as ceramics can be used by conducting a conductive treatment (for example, by forming a conductive metal film on the surface). The surface of the master shaft 7 is preferably subjected to a surface treatment for reducing the frictional force with the electroformed part 4, for example, a fluorine-based resin coating.

  In addition to the solid shaft, the master shaft 7 may be a solid shaft in which a hollow shaft or a hollow portion is filled with resin. In addition, in the bearing for rotation, the cross section of the master shaft is basically formed in a circular shape, but in the case of a sliding bearing, the cross section can be made into an arbitrary shape. It can also be a perfect circle shape. In the sliding bearing, the cross-sectional shape of the master shaft 7 is basically constant in the axial direction. However, in the rotating bearing and the rotating sliding bearing, the cross-sectional shape is not constant over the entire length of the shaft. May take the form.

  Since the accuracy of the outer peripheral surface of the master shaft 7 directly affects the accuracy of the bearing gap described later, surface accuracy that is important for bearing functions such as roundness, cylindricity, and surface roughness is finished in advance with high accuracy. There is a need. For example, in a bearing for rotation, roundness is important from the viewpoint of avoiding contact with the bearing surface. Therefore, it is necessary to increase the roundness of the outer peripheral surface of the master shaft 7 as much as possible. For example, it is desirable to finish to 80% or less of an average width (radial dimension) of a bearing gap described later. Therefore, for example, when the average width of the bearing gap is set to 2 μm, it is desirable that the outer peripheral surface of the master shaft is finished to a roundness of 1.6 μm or less.

  Masking is performed on the outer peripheral surface of the master shaft 7 except for the portion where the electroformed portion 4 is to be formed (shown as dots in FIG. 2). As the masking covering 8, an existing product having non-conductivity and corrosion resistance against the electrolyte solution is selectively used.

  The electroforming is performed by immersing the master shaft 7 in an electrolyte solution containing metal ions such as Ni and Cu, and energizing the electrolyte solution to deposit the target metal on the surface of the master shaft 7. If necessary, the electrolyte solution may contain a sliding material such as carbon or a stress relaxation material such as saccharin. The type of electrodeposited metal is appropriately selected according to physical properties and chemical properties such as hardness, wear resistance, and fatigue strength required for the bearing surface of the bearing. If the thickness of the electroformed part 4 is too thick, the peelability from the master shaft 7 is reduced, and if it is too thin, the durability of the bearing surface is reduced. The optimum thickness is set accordingly. For example, in a rotating bearing having a shaft diameter of 1 mm to 6 mm, the thickness is preferably 10 μm to 200 μm.

  By passing through the above process, the cylindrical electroformed part 4 is formed in the outer periphery of the master shaft 7, as shown in FIG. In addition, when the masking covering material 8 is thin, both ends of the electroformed portion 4 may protrude toward the covering material 8 and a tapered chamfered portion may be formed on the inner peripheral surface. Using this chamfered portion, a flange portion that prevents the electroformed portion from falling off from the resin portion can be formed. In this embodiment, the case where a chamfer part is not formed is illustrated.

  Thereafter, as shown in FIG. 3, the oil filler member 6 is disposed on the outer peripheral surface of the master shaft 7 adjacent to the electroformed portion 4 in the axial direction. As a material of the oil filler member 6, for example, an oil-containing metal obtained by impregnating a porous metal such as a sintered metal with a lubricating oil can be used. In addition, an oil-containing resin obtained by impregnating a porous resin with a lubricating oil, an oil-containing resin in which a lubricating component is dispersed and held in the resin, an oil-containing resin containing oil-containing porous particles, or a fiber material such as felt. Impregnated oil-impregnated fibers and the like can also be used as a supplementary oil member. In addition, when forming the oil filler member 6 with resin, it is necessary to have a higher melting point than the resin material to be injected so as not to be melted by the high-temperature resin material injected at the time of subsequent injection molding. Further, when a material (porous metal, porous resin, fiber material, etc.) that needs to be impregnated with lubricating oil is used for the lubricating oil member 6, when lubricating oil is filled in a bearing gap of the bearing device 1 described later. At the same time, the lubricating oil can be impregnated into the lubricating oil member 6.

  The shape of the bunkering member 6, the place to be placed, and the number to be placed are not limited to the above. For example, the cross-sectional shape of the oil filler member 6 can be formed in an appropriate shape such as a semicircular shape or a trapezoidal shape in addition to the rectangular shape shown in FIG. In FIG. 3, the oil filler member 6 is disposed at one end of the bearing 3, but may be disposed at a plurality of locations, for example, at both ends of the bearing 3. Alternatively, the electroformed part 4 may be formed at a plurality of locations separated in the axial direction, and the oil filler member 6 may be disposed between the electroformed parts. In addition, the oil filler member 6 and the electroformed part 4 can be spaced apart in the axial direction.

  Thus, the electroformed shaft 9 in which the electroformed part 4 and the oil filler member 6 are installed on the outer peripheral surface of the master shaft 7 is formed. The electroformed shaft 9 is transferred to the injection molding step shown in FIG. 4, and insert molding is performed using the electroformed portion 4, the oil filler member 6, and the master shaft 7 as insert parts.

FIG. 4 conceptually shows an insert molding process of the resin portion 5, and a mold including the movable mold 10 and the fixed movable mold 11 is provided with a runner 12, a gate 13, and a cavity 14. In this embodiment, the gate 13 is a dotted gate, and is formed at a plurality of locations (for example, at equal intervals in the circumferential direction) at positions corresponding to one end surface in the axial direction of the resin portion 5 of the molding die (fixed die 11). Three places) formed. The gate area of each gate 13 is set to an appropriate value according to the viscosity of the molten resin to be filled and the shape of the molded product.

  In the mold configured as described above, the movable mold 10 is brought close to the fixed mold 11 and clamped while the electroformed shaft 9 is positioned at a predetermined position. Next, in a state where the mold is clamped, molten resin P is injected and filled into the cavity 14 through the spool (not shown), the runner 12, and the gate 13, and the resin portion 5 is molded integrally with the electroformed shaft 9. To do.

  Note that the molten resin P is a thermoplastic resin, and amorphous resins such as polysulfone (PSF), polyethersulfone (PES), polyphenylsulfone (PPSU), and polyetherimide (PEI) are used as crystalline resins. As the liquid crystal polymer (LCP), polyether ether ketone (PEEK), polybutylene terephthalate (PBT), polyphenylene sulfide (PPS), or the like can be used. The type of filler to be filled in the resin is not particularly limited. For example, as the filler, fibrous filler such as glass fiber, whisker-like filler such as potassium titanate, and scaly filler such as mica. A fibrous or powdery conductive filler such as carbon fiber, carbon black, graphite, carbon nanomaterial, or metal powder can be used. These fillers may be used alone or in combination of two or more.

  After the mold is opened, the molded product in which the master shaft 7, the electroformed part 4, the oil filler member 6, and the resin part 5 are integrated is removed from the mold. This molded product is separated into a bearing 3 (see FIG. 1) composed of the electroformed part 4, the resin part 5, and the oil filler member 6 and the master shaft 7 in the subsequent peeling step.

  In this peeling step, the internal stress accumulated in the electroformed part 4 is released, so that the inner peripheral surface 4 a of the electroformed part 4 is expanded and peeled off from the outer peripheral surface of the master shaft 7. The internal stress is released by giving an impact to the master shaft 7 or the bearing 3, or by applying an axial pressure between the inner peripheral surface 4 a of the electroformed part 4 and the outer peripheral surface of the master shaft 7. Done. By releasing the internal stress, the inner peripheral surface of the electroformed part 4 is radially expanded, and a gap of an appropriate size is provided between the inner peripheral surface 4a of the electroformed part 4 and the outer peripheral surface of the master shaft 7. By forming, the master shaft 7 can be smoothly pulled out in the axial direction from the inner peripheral surface 4 a of the electroformed part 4, whereby the molded product can be removed from the electroformed part 4, the resin part 5, and the oil filler member 6. The bearing 3 and the master shaft 7 are separated. The diameter expansion amount of the electroformed part 4 can be controlled, for example, by changing the thickness of the electroformed part 4, the composition of the electrolyte solution, and the electroforming conditions.

  When the diameter of the inner periphery of the electroformed part 4 cannot be sufficiently increased only by applying an impact, the electroformed part 4 and the master shaft 7 are heated or cooled, thereby causing a difference in thermal expansion between them. The master shaft 7 and the bearing 3 can also be separated.

  Thereafter, the shaft member 2 is inserted into the bearing 3, and the bearing gap between the inner peripheral surface of the bearing 3 and the outer peripheral surface of the shaft member 2 is filled with lubricating oil, whereby the bearing device 1 shown in FIG. 1 is completed. .

  In the present embodiment, as shown in FIG. 1, the inner peripheral surface 3 a of the bearing 3 is formed by the inner peripheral surface 4 a of the electroformed part 4 and the small diameter inner peripheral surface 5 a of the resin part 5. The peripheral surface 4a acts as a bearing surface. By considering the composition of the resin material and molding conditions so that the small-diameter inner circumferential surface 5a of the resin portion 5 expands due to molding shrinkage when solidified after injection molding, a minute gap is formed between the outer circumferential surface of the master shaft 7 and the like. Can be formed. Thereby, the resin part 5 and the master shaft 7 can be easily separated. If the width of the minute gap is appropriate, in the bearing device 1 shown in FIG. 1, the minute gap between the small-diameter inner peripheral surface 5a of the resin portion 5 and the outer peripheral surface 2a of the shaft member 2 can function as a capillary seal. This is effective in preventing the lubricating oil from flowing out of the bearing gap. In addition, after the master shaft 7 is separated, the small-diameter inner peripheral surface 5a may be formed by machining or the like.

  As described above, the capillary seal expands the small-diameter inner peripheral surface 5a of the resin portion 5, and also forms a small-diameter outer peripheral surface (not shown) on the outer peripheral surface 2a of the shaft member 2 facing the small-diameter inner peripheral surface 5a. It can also be configured. Further, if the capillary seal is a taper seal in which the gap width is gradually reduced toward the bearing gap side, it is possible to prevent the lubricating oil from flowing out more effectively.

  When the master shaft 7 is used as the shaft member 2, the minute distance between the inner peripheral surface 4 a of the electroformed part 4 and the outer peripheral surface of the master shaft 7, which is obtained by the peeling process between the electroformed part 4 and the master shaft 7. The gap functions as a bearing gap. Since this bearing gap has the characteristics that the clearance is extremely small and has high accuracy due to the characteristics of electroforming, it is possible to provide a bearing having high rotational accuracy or slidability. It is not always necessary to use the master shaft 7 as the shaft member 2, and a bearing can be configured by replacing the shaft member separately manufactured with the same degree of accuracy as the master shaft 7. In this case, once the master shaft 7 is manufactured, the master shaft 7 can be repeatedly used. Therefore, the manufacturing cost of the master shaft 7 can be suppressed, and the cost of the bearing device 1 can be further reduced.

Moreover, in this embodiment, although the case where the electroformed part 4, the resin part 5, and the oil filler member 6 were integrally formed was illustrated, as a reference example , a recessed part is formed in the resin part 5, for example , and oil is provided in the recessed part. The member 6 can also be fixed. The concave portion of the resin portion 5 can be formed by, for example, the shape of a mold at the time of injection molding, or can be formed by removing a part of the resin portion 5 by machining such as turning after injection molding.

  During operation (rotation, sliding, rotation sliding, or swinging) of the bearing device 1, oil supplied from the lubricating oil member 6 is formed between the inner peripheral surface 4 a of the electroformed part 4 and the outer peripheral surface 2 a of the shaft member 2. By forming an oil film between them, generation of abnormal noise due to poor lubrication due to lack of oil and wear due to contact sliding between the shaft member 2 and the bearing 3 are avoided, and the product life is extended. Also, by holding the oil in the oil filler member, it is possible to supply the oil in small amounts rather than supplying oil from a space such as an oil reservoir, so that an appropriate oil film can be formed in the bearing gap over a long period of time. .

  The present invention is not limited to the above embodiment. In the above embodiment, the case where the bunkering member 6 is in contact with the shaft member 2 is illustrated. However, for example, as in the bearing device 21 according to the second embodiment of the present invention shown in FIG. 6 can be disposed at a position that is not in contact with the shaft member 2, and oil can be supplied to the bearing gap through the communication hole 17 penetrating the electroformed part 4. In the bearing device 21, the electroformed part 4 is formed on the inner peripheral surface and the inner bottom surface of the bearing 3 formed in a cup shape, and the shaft member 2 is inserted into the inner periphery of the bearing 3. Between the inner bottom surface 4c of the electroformed portion 4 and the tip of the convex spherical surface portion 2b of the shaft member 2, a thrust bearing portion T that contacts and supports the shaft member 2 in the thrust direction is formed. For example, as shown in FIG. 5, the oil filler member 6 can be disposed at a position in contact with the outer diameter surface of the electroformed portion 4. In addition, the oil filler member 6 may be provided at a position in contact with the lower end surface 4 d of the bottom of the electroformed part 4. Alternatively, the oil filler member 6 can be disposed inside the resin portion 5 that is radially separated from the electroformed portion 4 and communicated with the bearing gap through the communication hole 17.

  In the bearing device 31 according to the third embodiment of the present invention shown in FIG. 6, the side portion 15 and the bottom portion 16 of the cup-shaped bearing 3 are formed separately. The side portion 17 is formed by resin injection molding, and has a large-diameter inner peripheral surface 5b and a small-diameter inner peripheral surface. The oil filler member 6 is disposed on the large-diameter inner peripheral surface 5 b of the resin portion 5. The bottom portion 16 is formed of, for example, a metal material, and is fixed to the side portion 15 by a method such as adhesion, high frequency welding, or ultrasonic welding. A thrust bearing portion T that contacts and supports the shaft member 2 in the thrust direction is formed between the tip of the convex spherical surface portion 2b of the shaft member 2 and the upper end surface 16a of the bottom portion 16. In this case, as shown in FIG. 6, the lubricating oil member 6 may be provided on the side portion 15 side, and the lubricating oil member 6 may be provided on the bottom portion 16.

The bearing shown above can also be used as a hydrodynamic bearing that generates pressure by the hydrodynamic action of fluid in the bearing gap between the inner peripheral surface 4a of the electroformed part 4 and the outer peripheral surface 2a of the shaft member 2. Is possible. In this dynamic pressure bearing, for example, a dynamic pressure generating part such as a dynamic pressure groove, a multi-arc surface, or a step surface formed in a herringbone shape or the like is formed on the outer peripheral surface 2a of the shaft member 2, and the dynamic pressure generating part is It can be configured by facing the perfect inner circumferential surface 4a of the electroformed part 4. On the contrary, a dynamic pressure generating part can be formed on the inner peripheral surface 4 a of the electroformed part 4. In this case, the dynamic pressure generating part of the inner peripheral surface 4 a of the electroformed part is formed on the outer peripheral surface of the master shaft 7. It can be formed by forming a mold corresponding to the shape of the dynamic pressure generating portion and performing electroforming. Thereafter, the bearing 3 and the master shaft 7 are separated in the same procedure, and the shaft member 2 having a perfect circular outer peripheral surface is inserted into the inner periphery of the bearing 3 to constitute a hydrodynamic bearing.

  Further, a dynamic pressure bearing can also be employed for the thrust bearing portion of the bearing device. In this case, a shaft member 2 having a lower end surface is used. For example, a dynamic pressure generating portion such as a dynamic pressure groove or a step surface formed in a spiral shape is formed on the lower end surface of the shaft member 2, and the dynamic pressure generating portion is The thrust bearing portion can be configured by facing the surface facing the lower end surface of the member 2, for example, the inner bottom surface 4 c of the electroformed portion 4. On the contrary, a dynamic pressure generating portion can be formed on the inner bottom surface 4 c of the electroformed portion 4.

  The bearing device described above can be used by being incorporated in a motor for information equipment, for example. Hereinafter, the example which used the bearing apparatus 1 as a rotating shaft support apparatus for the said motor is demonstrated based on FIG.

  As shown in FIG. 7, the motor 100 is used as a spindle motor for a disk drive device such as an HDD, and includes a bearing device 1 that rotatably supports a shaft member 2 in a non-contact manner, and a shaft member. 2, and a stator coil 104 and a rotor magnet 105 that are opposed to each other with a gap in the radial direction, for example. The stator coil 104 is attached to the outer periphery of the bracket 106, and the rotor magnet 105 is attached to the inner periphery of the disk hub 103. The disk hub 103 holds one or more disks D such as magnetic disks. When the stator coil 104 is energized, the rotor magnet 105 is rotated by the electromagnetic force between the stator coil 104 and the rotor magnet 105, whereby the disk hub 103 and the disk D held by the disk hub 103 are integrated with the shaft member 2. Rotate to.

  In this embodiment, the bearing device 1 includes a bearing 3, a shaft member 2 inserted into the inner periphery of the bearing 3, and a thrust plate 107 attached to one end of the bearing 3. Although FIG. 7 illustrates the bearing device 1 shown in FIG. 1 as the bearing device, the bearing devices 21 and 31 shown in FIGS. 5 and 6 can also be used. On the upper end surface of the thrust plate 107, a region (thrust bearing surface) 107a in which a plurality of dynamic pressure grooves are arranged in a spiral shape is formed as a thrust dynamic pressure generating portion. When the shaft member 2 is rotated, an oil film is formed in a radial bearing gap between the outer peripheral surface 2a of the shaft member 2 and the inner peripheral surface 4a of the electroformed portion 4 serving as the radial bearing surface of the bearing 3, and thereby the shaft member 2 is radially A radial bearing portion R that is supported in a non-contact manner so as to be rotatable in the direction is formed. At the same time, in the thrust bearing gap between the lower end surface 2b of the shaft member 2 and the upper end surface 107a of the thrust plate 107, the shaft member 2 is supported in a non-contact manner so as to be rotatable in the thrust direction by the dynamic pressure action of the lubricating oil by the dynamic pressure grooves. A thrust bearing portion T is formed.

  The bearing device of the present invention is not limited to the above examples, and is used in a small motor for information equipment used under high-speed rotation, a polygon scanner motor of a laser beam printer, etc. It can also be suitably used for rotating shaft support. It can also be applied to fan motors that require a long service life.

Although the case where the bearing 3 is used as a bearing for rotation is illustrated in the above description, the bearing 3 can be any one of a sliding bearing, a rotating / sliding bearing, and a swinging bearing. It can also be applied to.

1 is a cross-sectional view of a bearing device 1 according to a first embodiment of the present invention. It is a perspective view which shows the state which formed the electroformed part 4 in the master axis | shaft 7. FIG. 3 is a perspective view of an electroformed shaft 9. FIG. It is sectional drawing which shows the state which attached the electroformed shaft 9 to the injection mold. It is sectional drawing of the bearing apparatus 21 which concerns on the 2nd Embodiment of this invention. It is sectional drawing of the bearing apparatus 31 which concerns on the 3rd Embodiment of this invention. It is sectional drawing which shows schematic structure of the motor 100 to which this invention is applied.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Bearing apparatus 2 Shaft member 3 Bearing 4 Electroformed part 5 Resin part 6 Refueling member 7 Master shaft 8 Coating material 9 Electroformed shaft 17 Communication hole 100 Motor R Radial bearing part T Thrust bearing part

Claims (5)

Is deposited formed on the outer peripheral surface of the master axis, the inner and electroformed portion having a bearing surface in a circumferential, a resin portion molded by insert to the inner peripheral of the electroformed part, the shaft inserted into the inner circumference of the electroformed part A member, a bearing gap formed between the bearing surface and the outer peripheral surface of the shaft member , filled with lubricating oil, and an annular oil-retaining member that supplies oil retained inside the base material to the bearing gap. A bearing device comprising a surface where the bearing surface starts to precipitate on the surface of the master shaft,
Master molding, electroformed part deposited and formed on the outer peripheral surface of the master shaft, and the oil filling member arranged on the outer circumference of the master shaft are injection-molded with resin as an insert part, so that the electroformed part and the lubricating oil member are placed on the inner circumference. A bearing device in which a resin part to be held is formed .   The bearing device according to claim 1, wherein the oil filler member is in contact with the shaft member.   The bearing device according to claim 1, wherein the oil supply member is in non-contact with the shaft member and supplies oil to the bearing gap through the communication hole.   A motor comprising the bearing device according to claim 1, a rotor magnet, and a stator coil. Depositing and forming an electroformed part on the outer peripheral surface of the master shaft, placing an annular oil-retaining member capable of holding oil inside the base material on the outer periphery of the master shaft, a master shaft, an electroformed part, And forming an electroformed part and a resin part holding the oil-retaining member on the inner periphery by injection molding with resin as an insert part of an electroformed shaft made of a lubricating oil member, and an electroformed part and a master shaft. The step of separating and separating the master shaft from the bearing made of the electroformed part, the oil filler member, and the resin part, and inserting the shaft member into the inner periphery of the bearing, the inner peripheral surface of the electroformed part and the outer periphery of the shaft member A method for manufacturing a bearing device, comprising sequentially filling a bearing gap with a surface with a lubricating oil.

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