JP2004320992A - Spindle motor and disk drive - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a spindle motor having such a constitution that even under excessive impact or the like, excessive collisions due to floatation of a rotation portion is eliminated between a disk and a signal conversion element, and fatal damages are avoided from being given to the signal conversion element or a locking means for positioning the signal conversion element, and to provide a disk drive provided therewith. <P>SOLUTION: The spindle motor 13 comprises a rotating body 5, a stator 11, and a fixed-side bearing member 6 which is fit to a rotating-side bearing member 3 and forms a trochoid fluid bearing, and a chassis 8. A hollow cylindrical portion 2a is formed in a rotor hub portion 2 in proximity to the central axis 1 of rotation, and the columnar portion 7b of a support rod portion 7 fixed on the chassis 8 is disposed in the hollow portion, without contacting the hollow portion. The lower end face of the abutting portion 18b of a cover 18 is abutted against the upper end face of the columnar portion 7b of the support rod 7, and a predetermined small gap is provided in between the upper end face 2c of the rotor hub portion 2 and the lower end face of the abutting portion 18b of the cover 18. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to a spindle motor used in a magnetic disk device or an optical disk device for recording / reproducing information at a high density, and a disk type recording / reproducing device (hereinafter, referred to as a disk drive device) provided with the spindle motor.

  Hereinafter, conventional general spindle motors and disk drive devices will be described with reference to the drawings.

  In order to explain the structure of a disk drive device provided with a conventional spindle motor, FIG. 8 shows a main structure of a disk drive device provided with a conventional spindle motor cut along a plane including a rotation axis to show a schematic configuration. Shown in cross section.

  8, a rotor hub 82 is fixed to a rotating shaft 81 by a method such as press fitting. A rotor magnet 82 and an annular retaining ring 84 are attached to the rotor hub 82 to form a rotating body 85. A fixed bearing member 89 composed of a bearing sleeve 87 having a protrusion 87 a projecting in a flange shape and a thrust plate 88 fixed to the bearing sleeve 87 is fixed to the chassis 86. The rotating shaft 81 is provided with a dynamic pressure generating groove such as a herringbone groove, and fits into the concave portion of the fixed-side bearing member 89 with a small gap. The rotating shaft 81 and the fixed-side bearing member 89 form a radial bearing portion. The rotating shaft 81 is rotatably supported in the radial direction by a fixed bearing member 89. Further, a dynamic pressure generating groove such as a herringbone groove is also formed on the thrust plate 88 constituting the fixed-side bearing member 89, and is generated on the lower end surfaces of the thrust plate 88 and the rotating shaft 81 as the rotating shaft 81 rotates. The rotating shaft 81 is axially supported by the applied dynamic pressure to form a rotatably supported thrust bearing portion. Is filled with a dynamic pressure lubricant 90. Further, a stator 91 in which a coil 91b is wound around a stator core 91a is attached to the chassis 86 to form a spindle motor 92.

  A disk 93 having a recording layer (also referred to as a recording layer or a recording film) formed on the upper surface of the flange portion of the rotor hub 82 is fixed, and a signal conversion element (not shown) and a signal conversion element are well known. A disk drive device is provided which is provided with rocking means (not shown) for positioning the element, and is capable of recording on the recording layer of the disk 93 or reproducing a recording signal from the recording layer.

By attaching the retaining ring 84 to the rotating body 85, even if an excessive impact or the like is applied, the retaining ring 84 fixed to the rotating body 85 comes into sliding contact with the projection 87a of the bearing sleeve 87. Is reliably prevented from coming off the fixed-side bearing member 89 (for example, see Patent Literature 1, Patent Literature 2, Patent Literature 3, and Patent Literature 4).
Japanese Patent Application Laid-Open No. 8-27547 (page 4, FIG. 1) JP-A-11-55900 (page 2, FIG. 1) JP-A-6-233495 (pages 2-3, FIGS. 1, 3) JP-A-9-247886 (page 2-3, FIG. 1)

  However, in the spindle motor 92 having the above-described conventional configuration, the inner diameter of the annular retaining ring 84 is smaller than the outer diameter of the projection 87a of the bearing sleeve 87, and the assembly procedure is complicated due to its dimensional relationship. was there. That is, after the rotor magnet 83 is fixed to the rotor hub 82 to which the rotation shaft 81 is fixed, the rotation shaft 81 is inserted into the concave portion of the fixed side bearing member 89 formed by the bearing sleeve 87 and the thrust plate 88, and the rotation shaft 81 is While being inserted into the fixed-side bearing member 89 and filled with the dynamic pressure lubricant 90, the retaining ring 84 is fixed to the rotor hub 82 by a known method such as bonding with an adhesive, press-fitting, caulking or laser welding. At that time, foreign substances such as adhesive chips generated at the time of bonding, cutting chips generated by press-fitting or crimping, or welding chips generated at the time of welding are attached. In the case of fixing by bonding, there is a problem with respect to the reliability of bonding that the dynamic pressure lubricant 90 attached to the rotor hub 82 reduces the bonding force. When the fixed bearing member 89 is fixed to the chassis 86 in a state where the rotating body 85 and the fixed bearing member 89 are combined, the upper end of the rotating shaft 81 is pressed in the axial direction by a press-fitting method, and pushed through the thrust plate 88. The pressure is transmitted to the bearing sleeve 87, and at least one of the thrust plate 88 and the rotating shaft 81 abuts on the rotating shaft 81, causing damage such as indentation, or the thrust plate 88 fixed to the bearing sleeve 87. May loosen, and the dynamic pressure lubricant 90 filled in the radial bearing portion and the thrust bearing portion as the fluid bearing may come out. In the case of fixing with an adhesive, the adhesion of the retaining ring 84 and the Similarly, there is a possibility that adhesive debris may be generated, and it is difficult to ensure the reliability of the spindle motor.

  Solution to the Problems The present invention solves the above problems, can be assembled by a simple assembling procedure, the rotating body does not come off from the fixed side bearing member even against excessive impact, etc., and furthermore, due to excessive lifting of the rotating body A spindle motor having a configuration that eliminates excessive collision between a disk and a signal conversion element and that does not cause fatal damage to a signal conversion element and a rocking means for positioning the signal conversion element, and a disk drive device including the same. The purpose is to provide.

  In order to achieve this object, a spindle motor according to the present invention includes a chassis, a rotating magnet, a rotating bearing member, a rotor hub portion formed of a hollow circular hole disposed at the center of rotation, and a column fixed to the chassis. And a stator having a wound coil and disposed on the chassis so as to face the rotating magnet, wherein the strut portion is disposed on the chassis so as to pass through a hollow circular hole portion of the rotor hub portion. A bearing for supporting the rotor hub portion is constituted by the fixed-side bearing member and the rotating-side bearing member arranged on the chassis, and the bearing is arranged at a position away from the column portion. Also, a thrust bearing portion in which a dynamic pressure generating groove is formed on one of the axially opposed surfaces of the rotating side bearing member and the fixed side bearing member, and a radially opposed side of the rotating side bearing member and the fixed side bearing member. And a radial bearing having a dynamic pressure generating groove formed on one of the surfaces. In addition, the rotor hub and the rotation-side bearing member are integrally formed. Further, the strut portion for fixing the fixed-side bearing member includes a flat portion and a cylindrical portion, and the flat portion and the cylindrical portion are integrally formed by individual members. In addition, the support portion to which the fixed-side bearing member is fixed is configured to include only the cylindrical portion.

  With these configurations, when the cover is assembled into the disk drive device such that it comes into contact with the tip of the cylindrical portion that forms the column, even if the cover is pressed by an external force, the cover will not touch the end. Because the contact part is in contact with the tip of the cylinder part of the support part, the cover does not come into contact with the rotating part of the spindle motor, and the fixed side even if it receives excessive vibration, drop, or other impact. The rotating side bearing member, that is, the rotor hub portion, does not fall off from the bearing member, and further, the disk does not excessively collide with a signal conversion element (for example, a magnetic head or an optical head) for recording and reproducing data on the recording layer. It is possible to realize a spindle motor for manufacturing a disk drive device with a very simple configuration and high impact resistance.

  Further, the spindle motor of the present invention has a configuration in which the chassis has a protruding portion on the column portion side of the support portion, the height of the protruding portion is set higher than the height of the fixed bearing member, and the rotor hub portion has a rotating bearing. It has a configuration having a protruding portion between the member and the fixed portion of the rotating magnet. Still further, a portion of the projecting portion of the chassis projecting from the upper end surface of the fixed-side bearing member is formed in a tapered shape such that the farther from the upper end surface of the fixed-side bearing member, the smaller the diameter of the projecting portion becomes. I have.

  With these configurations, it is possible to prevent the dynamic pressure lubricant that constitutes the hydrodynamic bearing from scattering for some reason.

  Further, the spindle motor of the present invention has a configuration in which the column has a thread at the tip of the column.

  With this configuration, even if the rotor hub on which the disk is mounted strongly contacts the cover due to some external factor such as a very large impact, the cover does not float from the tip of the column, and therefore, In addition, it is possible to realize a spindle motor for manufacturing a disk drive device having extremely strong shock resistance with a very simple configuration in which excessive collision between the disk and the signal conversion element is suppressed.

  Further, the disk drive device of the present invention comprises a chassis, a rotating magnet, a rotating side bearing member, a rotor hub portion including a hollow circular portion disposed at a rotation center portion, a support portion fixed to the chassis, and a winding portion. And a stator disposed on the chassis so as to face the rotating magnet. The support portion is disposed on the chassis so as to pass through a hollow circular hole of the rotor hub, and is disposed on the chassis. A disk drive device comprising a spindle motor disposed at a position away from the support column, the bearing configured to support a rotor hub portion by the fixed-side bearing member and the rotation-side bearing member. The disc, which is placed on the upper surface of the flange portion of the rotor hub and has a recording layer formed on the surface, abuts on one end of a columnar portion constituting a column of the spindle motor. A cover having a contact portion has a signal conversion element for recording and reproducing on the recording layer formed on the disk, the arrangement comprising a rocking means for positioning the signal conversion element to a predetermined track position. Further, the column portion of the spindle motor has a threaded portion at the tip of the columnar portion, and a through hole is provided at a position corresponding to the threaded portion of the column portion at the contact portion of the cover, and the cover is inserted through the through hole of the cover. Is abutted against the end face of the end portion of the column portion of the support portion, and is fixed by screwing.

  Further, the disk drive device of the present invention may further comprise a thrust bearing portion having a dynamic pressure generating groove formed on one of the axially opposed surfaces of the rotating side bearing member and the fixed side bearing member; A fluid bearing comprising a radial bearing portion in which a dynamic pressure generating groove is formed on one of the radially opposed surfaces of the side bearing member, and the rotor hub portion and the rotating side bearing member are integrally formed. A configuration in which the support portion for fixing the fixed-side bearing member is made up of a flat portion and a cylindrical portion, and the flat portion and the cylindrical portion are integrally formed as individual members, respectively, and a support portion for fixing the fixed-side bearing member. Is composed only of a cylindrical portion, the chassis has a protruding portion on the column side of the support portion, and the height of the protruding portion is set higher than the height of the fixed-side bearing member. Department In addition to the configuration having a protruding portion between the fixing portion of the rotating magnet and the fixed portion of the rotating magnet, a portion of the protruding portion of the chassis protruding from the upper end surface of the fixed-side bearing member is further away from the upper end surface of the fixed-side bearing member. It also has a configuration formed in a tapered shape with a smaller diameter.

  With these configurations, since the contact portion of the cover is in contact with the tip of the cylindrical portion of the support portion, even if an external force is applied to the cover, the cover slides on the rotating portion of the spindle motor, There is no fluctuation in the rotation of the spindle motor, and the gap between the upper end face of the rotor hub and the lower end face of the abutting portion of the cover can be set to a predetermined gap size. When receiving another impact, the rotating bearing member, that is, the rotor hub portion, does not come off from the fixed bearing member, and further, excessive collision between the disk and the signal conversion element is suppressed, and the recording layer formed on the disk surface Alternatively, it is possible to realize a disk drive device excellent in impact resistance without causing fatal damage to the swinging means for positioning the signal conversion element.

  Also, even if the rotor hub on which the disk is mounted strongly contacts the cover due to some external factor such as an extremely large impact, the cover does not float from the tip of the support, and therefore the disk does not float. Excessive collision between the disk and the signal conversion element is suppressed, and the recording layer formed on the disk surface or the rocking means for positioning the signal conversion element is not fatally damaged, and a high impact resistance reliability is achieved. It is possible to realize an excellent disk drive device with high performance.

  As described above, according to the present invention, since the lower end surface of the contact portion of the cover is in contact with the tip of the cylindrical portion of the support portion, the cover can be rotated even when an external force is applied to the cover. The rotation of the spindle motor does not fluctuate due to contact with the rotating part of the motor, and the mechanical dimensions of the rotor hub, rotating bearing, fixed bearing and support are precisely managed. By doing so, the gap between the upper end surface of the rotor hub portion and the lower end surface of the contact portion of the cover can be set to a small predetermined gap size. The rotating side bearing member, that is, the rotor hub portion does not come off from the member, and furthermore, excessive collision between the disk and the signal conversion element due to the floating of the rotor hub portion is suppressed, and It made the recording layer, and it is possible to prevent such permanent damage to a rocking means for positioning the signal conversion element.

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

(Embodiment 1)
FIGS. 1 and 2 are views for explaining a spindle motor and a disk drive device including the same according to the first embodiment of the present invention. FIG. 1 is a side sectional view schematically showing a configuration of a main part of a disk drive device including a spindle motor according to Embodiment 1 of the present invention, and FIG. 2 is a disk drive device including a spindle motor according to Embodiment 1 of the present invention. FIG. 2 is a plan sectional view schematically showing a configuration of a main part of FIG. FIG. 1 shows a cross section taken along line BB in FIG. 2, and FIG. 2 shows a cross section taken along line AA in FIG.

  1 and 2, a rotor hub 2 which rotates around a rotation center axis 1 has a hollow cylindrical part 2a having a circular hole near the rotation center axis 1, and a hollow cylindrical part having the circular hole. The rotating side bearing member 3 is fixed to the outer peripheral portion of 2a by press-fitting, bonding or other method. A rotating magnet 4 magnetized to a plurality of magnetic poles is fixed to the lower surface on the outer peripheral side of the rotor hub portion 2 by press-fitting, bonding, or other method, and is rotated by the rotor hub portion 2, the rotating bearing member 3, and the rotating magnet 4. The body 5 is constituted. The rotor hub 2 and the rotary bearing member 3 do not need to be separate components, and the rotor hub 2 and the rotary bearing member 3 are integrally formed, and the hollow cylindrical portion 2a of the rotor hub 2 having a circular hole is formed. The outer peripheral surface and the lower surface of the flange portion 2b may be configured as a rotation-side bearing member.

  On the other hand, the column part 7 to which the fixed-side bearing member 6 is fixed by bonding or welding or other method is arranged such that the center axis thereof coincides with the rotation center axis 1 so as to be formed in the circular hollow part of the hollow cylindrical part 2a of the rotor hub part 2. The rotor hub 2 is inserted into the chassis 8 so as to rotate freely with a gap without contact, and is fixed to the chassis 8 by press fitting, bonding, or other methods. In addition, as shown in FIG. 1, the support | pillar part 7 is not limited to one member integrally formed so that it may have the plane part 7a and the column part 7b, The column portion 7b may be formed so as to be integrated. The coil 9 is wound around a plurality of magnetic pole teeth of the stator core 10 to form a stator 11, and the inner peripheral surface of the tip of the plurality of magnetic pole teeth of the stator 11 is fixed to the rotor hub 2. It is fixed to the chassis 8 so as to face the outer peripheral surface. Further, a thrust suction plate 12 made of a soft magnetic material is fixed to the chassis 8 by a method such as adhesion so as to face the lower end surface of the rotating magnet 4, and magnetic attraction acts between the rotating magnet 4 and the thrust suction plate 12. Are configured to generate an action of attracting each other, and form a spindle motor 13.

  The rotation-side bearing member 3 fixed to the rotor hub 2 has a flange 3a on the outer peripheral surface, and the lower end surface of the flange 3a of the rotation-side bearing member 3 and the outer peripheral surface below the flange 3a are supported by the support portion. 7, the lower end surface of the flange 3a of the rotating side bearing member 3 or the upper end surface of the fixed side bearing member 6, that is, the upper end surface and the inner peripheral surface of the fixed side bearing member 6 fixed to A dynamic pressure generating groove is formed on one of the axially opposed surfaces of the rotating side bearing member 3 and the fixed side bearing member 6. Furthermore, the outer peripheral surface below the flange 3a of the rotating side bearing member 3 or the inner peripheral surface of the fixed side bearing member 6, that is, the respective surfaces of the rotating side bearing member 3 and the fixed side bearing member 6 that face each other in the radial direction. A dynamic pressure generating groove is formed in one of the grooves. The clearance between the lower end surface of the flange 3a of the rotating bearing member 3 and the upper end surface of the fixed bearing member 6, and the outer peripheral surface below the flange 3a of the rotating bearing member 3 and the fixed side. A gap between the inner peripheral surface of the bearing member 6 is filled with a dynamic pressure lubricant 14 such as an ester-based synthetic oil, and the lower end surface of the flange portion 3a of the rotating-side bearing member 3 and the fixed-side bearing member. 6 constitutes a thrust bearing portion, and forms a radial bearing portion between an outer peripheral surface below the flange portion 3a of the rotating bearing member 3 and an inner peripheral surface of the fixed bearing member 6. This constitutes a so-called shaft rotation type fluid bearing. The dynamic pressure generating groove forming the radial fluid bearing portion is formed in a herringbone shape according to a known technique, and the dynamic pressure generating groove forming the thrust bearing portion is configured such that the dynamic pressure lubricant 14 If the pumping action is performed in the direction toward the center of, for example, a spiral shape, the dynamic pressure lubricant 14 will not flow out.

  Accordingly, by supplying a current to the coil 9, the rotating magnet 4, that is, the rotor hub 2 rotates as is well known, and the rotation of the rotating bearing member 3 generates a dynamic pressure in the dynamic pressure lubricant 14, and the fixed side The dynamic pressure is applied to the bearing member 6 and the rotation-side bearing member 3 in the radial direction and the axial direction, so that the rotor hub 2 is smoothly rotated around the rotation center axis 1.

  The chassis 8 has a protruding portion 8a on the rotation center shaft 1 side, and the column 7 or the fixed bearing member 6 is fixed to the protruding portion 8a by press-fitting, bonding, or another method. Further, the protruding portion 8 a of the chassis 8 is configured such that the rotor hub portion 2 is rotated, and a dynamic pressure formed on one of the lower end surface of the flange portion 3 a of the rotating bearing member 3 and the upper end surface of the fixed bearing member 6. The height of the lower end surface of the flange 3a of the rotary bearing member 3 in a state in which the rotary bearing member 3 floats is set to be equal to or greater than the height of the lower groove by the generated groove. Further, the upper end of the protruding portion 8a of the chassis 8 is tapered so that its diameter becomes smaller as it goes upward from the vicinity of the upper end of the fixed-side bearing member 6 to the upper part. Note that, as shown in a partial cross-sectional view showing another example of the projecting portion of the chassis in FIG. 3, the projecting portion 8a of the chassis 8 may be formed in a cylindrical straight shape.

  With this configuration, when the rotor hub portion 2 rotates, the dynamic pressure lubrication filled in the gap between the lower end surface of the flange portion 3 a of the rotating bearing member 3 and the upper end surface of the fixed bearing member 6. The composition is such that the agent 14 does not scatter from the bearing portion due to an external influence for some reason. Further, for example, as shown in a partially enlarged sectional view of the shape of the lubricant reservoir groove portion in FIG. 4, cross sections are respectively formed on the lower end surface of the flange 3 a of the rotating side bearing member 3 and the outer peripheral surface below the flange 3 a. The substantially triangular shape lubricant storage groove 43 and the lubricant storage groove 44 are provided on the upper end surface of the fixed-side bearing member 6 (the surface facing the lower end surface of the flange 3a of the rotation-side bearing member 3) and the inner peripheral surface. A lubricant storage groove 41 and a lubricant storage groove 42 each having a substantially triangular cross section are provided on a surface (a surface facing the outer peripheral surface below the flange 3a of the rotation-side bearing member 3), and a lower end surface of the flange 3a. By filling the dynamic pressure lubricant 14 between the lubricant reservoir groove 43 and the lubricant reservoir groove 44 on the outer peripheral surface below the flange 3a, the viscosity and surface tension of the dynamic pressure lubricant 14 are reduced. The outflow of the dynamic pressure lubricant 14 can be prevented. Note that the lubricant reservoir groove 43 and the lubricant reservoir groove 44 of the rotating side bearing member 3 may not be provided.

  Further, on the upper surface of the flange portion 2b of the rotor hub portion 2, a disk 15 having a recording layer (not shown, also referred to as a recording layer or a recording medium film) formed on the surface is mounted and fixed with screws 16. The disk 15 is fixed to the upper surface of the flange 2 b of the rotor hub 2 by the elastic force of the disk holding member 17, and is configured to be rotatable with the rotation of the rotor hub 2.

  Oscillating means (not shown) for positioning a signal conversion element (not shown, for example, a magnetic head, an optical head, etc.) for recording and reproducing on a recording layer formed on the disk 15 by a known method at a predetermined track position. Needless to say, the signal conversion element is disposed to face the disk 15 via a suspension or an optical pickup carrier, for example.

  Further, the upper end of the cylindrical portion 7b of the support portion 7 is brought into contact with the lower end surface of the contact portion 18b of the projecting portion 18a of the cover 18, so that the upper end surface 2c of the rotor hub 2 and the contact portion 18b of the cover 18 A cover 18 is fixedly held to the chassis 8 or a housing (not shown) by means of screws or the like so that a small gap is provided between the end faces, and a disk drive comprising the disk 15, the spindle motor 13 and the cover 18 is provided. Make up the device.

  The height of the upper end surface 2c of the rotor hub 2 during rotation of the rotor hub 2 depends on the height of the fixed-side bearing member 6, the thickness of the flange 3a of the rotating-side bearing member 3, the thickness of the rotor hub 2, and the height of the thrust bearing. This is the sum of the floating amount of the rotor hub 2 due to the dynamic pressure lubricant 14, and the height of the fixed-side bearing member 6, the thickness of the flange 3a of the rotating-side bearing member 3, and the thickness of the rotor hub 2 are controlled by mechanical dimensions. Is relatively easy, and the floating amount of the rotor hub portion 2 is a numerical value that can be calculated to design a dynamic pressure generating groove as a thrust bearing portion so as to have a predetermined floating amount. On the other hand, the height of the column portion 7b of the column portion 7 can be easily controlled as a mechanical dimension, and the contact portion 18b of the cover 18 is in contact with the tip of the column portion 7b. It is relatively easy to provide a predetermined gap between the upper end surface 2c and the lower end surface of the contact portion 18b of the cover 18. Therefore, the gap between the upper end face 2c of the rotor hub 2 and the lower end face of the contact portion 18b of the cover 18 can be set to a very small predetermined value, and the gap between the upper end face 2c of the rotor hub 2 and the cover 18 can be set. By setting the gap between the lower end surfaces of the contact portions 18b to be a small gap and making the upper end portion of the columnar portion 7b of the support portion 7 contact the lower end surface of the contact portion 18b of the cover 18, Even if an external force is applied to the cover 18 such as by manually pressing the cover 18, the cover 18 is in contact with the tip of the cylindrical portion 7 b of the support portion 7. 13 does not come into contact with the rotating part.

  In addition, the rotor hub portion 2 on which the disk 15 is mounted does not rise due to the magnetic attraction between the rotating magnet 4 and the thrust suction plate 12 fixed to the chassis 8 against normal vibration and impact. The thrust suction plate 12 may be omitted if the magnetic attraction generated between the chassis 8 and the rotating magnet 4 is sufficiently large by forming the chassis 8 from a magnetic material.

  In addition, the rotating bearing member 3, that is, the rotor hub portion 2 does not fall out of the fixed bearing member 6 even if it receives an excessive vibration, a drop, or other impact, and the lower end surface of the abutting portion 18 b of the cover 18 has a support. Since the upper end portion of the cylindrical portion 7b of the portion 7 abuts, the amount of movement of the rotor hub portion 2 is very small. Therefore, the disk 15 mounted on the upper surface of the flange portion 2b of the rotor hub portion 2 is used for recording / reproducing on the recording layer. The surface of the disk 15 on which the recording layer is formed or the signal conversion element is not fatally damaged due to excessive collision with the signal conversion element, and therefore, the swing means is also fatally damaged. There is no.

  Needless to say, the lower end surface of the contact portion 18 b of the cover 18 is set to have a larger area than the hollow portion of the rotor hub 2.

  Further, even when the rotor hub portion 2 rises due to some external factor and the upper end surface 2c of the rotor hub portion 2 and the lower end surface of the contact portion 18b of the cover 18 come into contact with each other, the diameter of the support portion 7 is reduced and the rotor hub portion is reduced. The radius of the sliding contact portion between the upper end surface 2c of the rotor hub portion 2 and the lower end surface of the contact portion 18b of the cover 18 is reduced by reducing the inner diameter of the circular hollow portion of the hollow cylindrical portion 2a of the portion 2. The rotation of the disk 15 is not greatly hindered.

  Also, as in the above-described conventional spindle motor, the column portion 7 is provided in the hollow portion of the hollow cylindrical portion 2a of the rotor hub portion 2 in comparison with the thrust fluid bearing portion composed of the rotating shaft and the thrust plate. By passing the bearing, the effective radius of the lower end surface of the flange portion 3a of the rotating side bearing member 3 and the upper end surface of the fixed side bearing member 6 facing the upper end surface of the rotating side bearing member 3 constituting the thrust fluid bearing portion from the rotation center shaft 1 is increased, and the thrust is increased. The bearing rigidity as the fluid bearing portion is increased, and therefore, the rotation center shaft 1 of the radial fluid bearing portion formed between the outer peripheral surface of the rotating bearing member 3 and the inner peripheral surface of the fixed bearing member 6 opposed thereto. Can be reduced in the axial direction, the spindle motor 13 can be made thinner, and the disk drive device can be made thinner.

  The spindle motor according to the first embodiment of the present invention described above is a description of a so-called radial gap type inner rotor motor. However, the present invention is not limited to this. Can also be applied. FIG. 5 shows an example of the radial gap type outer rotor motor of the disk drive device according to the first embodiment of the present invention. 5, the same elements and names as those in FIG. 1 are given the same reference numerals. The coil 9 is fixed to the chassis 8 via the mounting member 51 such that the outer peripheral surface of the stator 11 in which the coil 9 is wound around the stator core 10 faces the inner peripheral surface of the rotating magnet 4 fixed to the rotor hub portion 2. The configuration in which the support portion 7 is inserted into the circular hollow portion of the hollow cylindrical portion 2a of the rotor hub portion 2 is the same as in the above-described first embodiment, and the other configurations are also the same as in the above-described first embodiment. Therefore, detailed description is omitted here.

  As described above, according to the disk drive device including the spindle motor according to Embodiment 1 of the present invention, even when an external force is applied to the cover, the abutting portion of the cover remains at the tip of the columnar portion of the column. Because of the contact, the cover does not slide on the rotating part of the spindle motor to cause fluctuations in the rotation of the spindle motor, and the rotation of the rotor hub portion, the rotating bearing member, the fixed bearing member, and the support portion is prevented. By precisely managing the respective mechanical dimensions, the gap between the upper end face of the rotor hub and the lower end face of the abutting portion of the cover can be set to a predetermined gap dimension, resulting in excessive vibration, dropping, and other impacts. In this case, the rotation-side bearing member, that is, the rotor hub portion, does not come off from the fixed-side bearing member, and further, excessive collision between the disk and the signal conversion element is suppressed, and This is a thin type that is suitable for a reliable and excellent disk drive device with high impact resistance without causing fatal damage to the rocking means for positioning the recording layer or signal conversion element formed on the disk surface. Spindle motor can be realized.

  In addition, by using a spindle motor having such a configuration for a disk drive device, a disk drive device having extremely high shock resistance can be realized.

(Embodiment 2)
FIG. 6 is a diagram for explaining a spindle motor and a disk drive device including the same according to the second embodiment of the present invention. FIG. 6 is a side cross-sectional view schematically illustrating a main part configuration of a disk drive device including a spindle motor according to Embodiment 2 of the present invention, and illustrates a cross section cut along a plane including a rotation center axis. 6, the same elements and names as those in FIG. 1 described above are denoted by the same reference numerals, and redundant description will be omitted.

  6, a different point from the above-described first embodiment is that a female screw portion 61c is provided at the center of the upper end portion of the column portion 61b of the support portion 61, and a through hole is formed at a position of the cover 62 corresponding to the female screw portion 61c. And the cover fixing screw 63 is screwed to the female screw portion 61 c of the column 61 through the through hole of the cover 62, and the cover 62 is fixed to the column 61. Other configurations are the same as those of the first embodiment, and a detailed description thereof will be omitted.

  As described above, according to the spindle motor in the second embodiment of the present invention, the cover 62 is fixedly screwed to the column 61, and the rotor hub on which the disk is mounted due to some external factor such as a very large impact. Even if the portion strongly contacts the cover side, the cover does not float from the tip of the column, and therefore, as in the first embodiment, excessive collision between the disk and the signal conversion element is suppressed. It is suitable for a reliable and excellent disk drive device with high impact resistance without causing fatal damage to the rocking means for positioning the recording layer or signal conversion element formed on the disk surface. Spindle motor can be realized.

  Further, by using the spindle motor having such a configuration for the disk drive, it is possible to realize a disk drive having higher impact resistance.

(Embodiment 3)
FIG. 7 is a diagram for explaining a spindle motor and a disk drive device including the same according to the third embodiment of the present invention.

  FIG. 7A is a side cross-sectional view schematically showing a main configuration of a disk drive device including a spindle motor according to Embodiment 3 of the present invention, and shows a cross section cut along a plane including a rotation center axis. . In FIG. 7A, the same elements and names as those in FIG. 1 or FIG. 6 described above are denoted by the same reference numerals, and redundant description will be omitted.

  In FIG. 7A, a rotor hub 72 that rotates around the rotation center axis 1 has a hollow circular hole 72 a substantially coincident with the center rotation center axis 1 (the circular hole 72 a is the same as in the first and second embodiments). (Corresponding to a hollow cylindrical portion). A rotating bearing member 73 is fixed to the lower end surface of the center side 72b of the rotor hub 72 by welding, bonding, or other known method. A rotating magnet 4 magnetized into a plurality of magnetic poles is fixed to the lower surface of the outer peripheral side 72d of the rotor hub 72 by press-fitting, bonding, or another method, so that the rotor hub 72, the rotating bearing member 73, and the rotating magnet 4 The rotating body 75 is constituted. The rotor hub 72 and the rotation-side bearing member 73 do not need to be separate components, and the rotor hub 72 and the rotation-side bearing member 73 may be integrally formed.

  Further, unlike the first embodiment or the second embodiment, the support portion 71 is formed in a completely cylindrical shape without a disk-shaped protrusion at the lower end. An upper female screw portion 71a and a lower female screw portion 71b are provided at the centers of the upper end and the lower end of the column 71, respectively.

  On the other hand, the fixed-side bearing member 76 has a substantially hollow cylindrical shape, and an annular groove 76b is formed at the upper end side between the center side 76a and the end side 76c. In the fixed-side bearing member 76, a column portion 71 is fixed to a hollow portion on the center side 76a by press-fitting, bonding, or another known method. The fixed-side bearing member 76 and the support 71 are arranged such that their respective centers coincide with the rotation center axis 1. A rotation-side bearing member 73 fixed to the rotor hub 72 is inserted so as to rotate freely with its center axis coinciding with the rotation center axis 1 with a gap without contacting the annular groove 76b. ing. Note that the support portion 71 and the fixed-side bearing member 76 may be formed integrally with one member instead of being formed integrally with individual members as shown in FIG. 7A.

  Further, the chassis 78 is formed on the chassis 78 such that the inner peripheral surface of the tip of the magnetic pole teeth of the stator 11 in which the coil 9 is wound around the plurality of magnetic pole teeth of the stator core 10 faces the outer peripheral surface of the rotating magnet 4 fixed to the rotor hub 72. The spindle motor 13 is configured such that the thrust suction plate 12 made of a soft magnetic material is fixed to the chassis 78 by bonding or the like so as to face the lower end surface of the rotating magnet 4 to form the spindle motor 13. This is the same as in Embodiment 2.

  The rotation-side bearing member 73 fixed to the lower end surface of the center side 72b of the rotor hub 72 has a groove 76b of a fixed-side bearing member 76 in which the outer peripheral surface and the lower end surface of the rotation-side bearing member 73 are fixed to the column 71. The outer peripheral surface of the rotary bearing member 73 or the outer peripheral inner surface of the groove 76b of the fixed bearing member 76, that is, the rotational bearing member 73 A dynamic pressure generating groove is formed on one of the radially opposed surfaces of the fixed bearing member 76 and the fixed bearing member 76. Further, the lower end surface of the rotating side bearing member 73 or the groove bottom surface of the groove portion 76b of the fixed side bearing member 76, that is, any one of the surfaces of the rotating side bearing member 73 and the fixed side bearing member 76 that are opposed in the axial direction. A dynamic pressure generating groove is formed. The gap between the outer peripheral surface of the rotating bearing member 73 and the inner peripheral surface on the outer peripheral side of the groove 76b of the fixed bearing member 76, and the lower end surface of the rotating bearing member 73 and the fixed bearing member 76 The gap between the groove bottom of the groove 76b is filled with a dynamic pressure lubricant 14 such as an ester-based synthetic oil, for example, so that the outer circumferential surface of the rotating bearing member 73 and the outer circumferential side of the groove 76b of the fixed bearing member 76 are filled. A radial bearing portion is formed with the inner peripheral surface of the bearing, and a thrust bearing portion is formed between the lower end surface of the rotating bearing member 73 and the groove bottom surface of the groove portion 76b of the fixed bearing member 76. Constituting a fluid bearing. The dynamic pressure generating groove constituting the thrust bearing portion is formed, for example, in a spiral shape such that the dynamic pressure lubricant 14 performs a pumping action in a direction toward the center of the rotation center shaft 1, and the radial fluid bearing portion is formed. If the dynamic pressure generating groove is formed in a herringbone shape by a known technique, the dynamic pressure lubricant 14 does not flow outward. Further, if a lubricant reservoir having a substantially triangular cross section as shown in FIG. 4 is provided in the first embodiment, the outflow of the dynamic pressure lubricant 14 may occur due to the viscosity and surface tension of the dynamic pressure lubricant 14. Can be prevented.

  Further, in the configuration of the third embodiment of the present invention shown in FIG. 7A, unlike the first and second embodiments described above, the chassis 78 does not have the protruding portion (8a), but has the rotor hub portion. Since the portion of the outer peripheral side 72d of the rotating magnet 4 on the outer peripheral side 72d extends downward, when the rotor hub 72 rotates, the outer peripheral surface of the rotating side bearing member 73 and the outer peripheral side of the groove 76b of the fixed side bearing member 76 are rotated. The dynamic pressure lubricant 14 filled in the gap between the inner peripheral surfaces does not scatter from the bearing portion due to external influence due to any cause.

  The center side 76a of the fixed-side bearing member 76 is further extended upward, and the inner peripheral surface of the rotating-side bearing member 73 and the inner peripheral surface of the center side of the groove 76b of the fixed-side bearing member 76 face in the radial direction. A dynamic pressure generating groove is formed on one of the surfaces, and a gap between the surfaces facing each surface is filled with a dynamic pressure lubricant 14 such as an ester-based synthetic oil, for example. It is also possible to form a radial bearing portion between the inner peripheral surface of the bearing member 73 and the inner peripheral surface on the center side of the groove 76b of the fixed-side bearing member 76.

  Therefore, by supplying a current to the coil 9, the rotating magnet 4, that is, the rotor hub 72 is rotated as is well known, and the rotation of the rotating side bearing member 73 generates a dynamic pressure on the dynamic pressure lubricant 14, so that the fixed side Dynamic pressure is applied to the bearing member 76 and the rotation-side bearing member 73 in the radial direction and the axial direction, and the rotor hub 72 is smoothly rotated around the rotation center axis 1.

  Next, FIG. 7B is a side cross-sectional view schematically showing a main part configuration of a disk drive device having a spindle motor of another configuration according to the third embodiment of the present invention, which also includes a rotation center axis. The cross section cut by a plane is shown. In FIG. 7B, the same reference numerals are given to the same elements and names as those in FIG. 7A described above, and redundant description will be omitted.

  The spindle motor of another configuration according to the third embodiment of the present invention is different from the spindle motor shown in FIG. 7A in that the shape of the rotor hub portion 72 and the rotation-side bearing member 173 included in the rotating body 75 and In the configuration. First, the rotor hub portion 72 that rotates around the rotation center axis 1 has a hollow circular hole portion 72a substantially coinciding with the center rotation center axis 1 (also in this case, the circular hole portion 72a is 2), a rotating bearing member 173 is fixed to the lower end face of the center side 72b of the rotor hub 72 by welding, bonding or other known method, and a plurality of rotating bearing members 173 are provided on the lower surface of the outer peripheral side 72d of the rotor hub 72. FIG. 7 (a) shows that the rotating magnet 4 magnetized on the magnetic poles is fixed by press-fitting, bonding or other method to form the rotating body 75 with the rotor hub 72, the rotating bearing member 173 and the rotating magnet 4. ) Is the same as that of the spindle motor of FIG. 3A except that a protruding portion 72e extending downward is formed between the center side 72b and the outer peripheral side 72d. Further, the rotation side bearing member 173 has a flange portion 173a on the outer peripheral surface, which is different from the spindle motor shown in FIG. 7A. The configuration in which the rotation-side bearing member 173 has the flange portion 173a is the same as the configuration of the spindle motor described in the first and second embodiments. Note that the rotor hub 72 and the rotation-side bearing member 173 do not need to be separate components, and the rotor hub 72 and the rotation-side bearing member 173 may be integrally formed as shown in FIG. 7B. The same applies to a spindle motor having another configuration.

  In the spindle motor having another configuration according to the third embodiment of the present invention illustrated in FIG. 7B, the lower end surface of the flange 173 a of the rotation-side bearing member 173 and the outer peripheral surface below the flange 173 a are: The lower end surface of the flange portion 173a of the rotating side bearing member 173 or the fixed side bearing member 76 is configured to face the upper end surface of the end side 76c of the fixed side bearing member 76 and the inner peripheral surface of the outer peripheral side of the groove portion 76b. A dynamic pressure generating groove is formed on the upper end surface of the end side 76c, that is, on one of the axially opposed surfaces of the rotating side bearing member 173 and the fixed side bearing member 76. Further, the outer peripheral surface below the flange portion 173a of the rotating side bearing member 173 or the inner peripheral surface on the outer peripheral side of the groove portion 76b of the fixed side bearing member 76, that is, in the radial direction of the rotating side bearing member 173 and the fixed side bearing member 76. A dynamic pressure generating groove is formed on one of the opposing surfaces. The clearance between the lower end surface of the flange portion 173a of the rotation-side bearing member 173 and the upper end surface of the end side 76c of the fixed-side bearing member 76, and the outer periphery below the flange portion 173a of the rotation-side bearing member 173. The gap between the surface and the inner peripheral surface on the outer peripheral side of the groove 76 b of the fixed-side bearing member 76 is filled with a dynamic pressure lubricant 14 such as an ester-based synthetic oil, and the flange portion of the rotating-side bearing member 173 is provided. A thrust bearing portion is formed between the lower end surface of the fixed-side bearing member 76 and the lower end surface of the fixed-side bearing member 173, and the outer peripheral surface below the flange portion 173 a of the rotating-side bearing member 173 and the fixed-side bearing member 76 are formed. A radial bearing portion is formed between the outer peripheral surface of the groove portion 76b and an inner peripheral surface of the groove portion 76b, that is, a so-called shaft-rotating fluid bearing is configured in the same manner as in the first and second embodiments. It is.

  The protruding portion 72e formed by extending downward between the center side 72b and the outer peripheral side 72d of the rotor hub 72 is, as described in the first embodiment, provided with the protruding portion (8a) provided on the chassis (8). Similarly to the above, when the rotor hub 72 rotates, the dynamic pressure lubrication filled in the gap between the lower end surface of the flange portion 173a of the rotating bearing member 173 and the upper end surface of the end side 76c of the fixed bearing member 76. The agent 14 has an effect of preventing the agent 14 from being scattered from the bearing portion due to an external influence for some reason.

  The configuration of another spindle motor according to the third embodiment of the present invention shown in FIG. 7B is the same as the configuration of the spindle motor shown in FIG. 7A except for the configuration described above. In order to avoid duplication, further description of the configuration of another spindle motor according to the third embodiment of the present invention shown in FIG. 7B will be omitted.

  In the pindle motor 13 according to the third embodiment of the present invention shown in FIG. 7, the upper surface of the outer peripheral side 72 d serving as the flange of the rotor hub 72 has a stepped and raised centermost annular protrusion. A portion 72c and an inner peripheral side flat portion are formed. A disk 15 having a recording layer formed on the upper surface of the outer peripheral flat portion 72d on the outer peripheral side 72d is placed, and the disk 15 is attached to the rotor hub by the elastic force of a disk holding member 17 fixed to the inner peripheral flat portion by screws 16. It is fixed to the upper surface of the outer peripheral side 72d which becomes the flange portion of the portion 72, and is configured to be rotatable with the rotation of the rotor hub portion 72.

  In addition, the signal conversion element for recording and reproducing on the recording layer formed on the disk 15 by a well-known method is arranged opposite to the disk 15 via a rocking means for positioning the signal conversion element at a predetermined track position. Needless to say.

  Then, a through hole is provided at a position of the cover 108 corresponding to the upper female screw portion 71a of the column 71, and the cover fixing screw 73a is screwed to the upper female screw 71a of the column 71 through the through hole of the cover 108. 108 is fixed to the support 71. Further, another through hole is provided at the position of the chassis 78 or the housing corresponding to the lower female screw portion 71b, and the lower female screw portion 71b of the support portion 71 is formed through the through hole of the chassis 78 by screwing with the chassis fixing screw 73b. The chassis 78 is fixed to the column 71 by screwing. At this time, the cover 108 is fixedly held to the chassis 78 or a housing or the like by screws or the like so that a small gap is provided between the annular projection 72c on the center side 72b of the rotor hub 72 and the cover 108. A disk drive device including the disk 15, the spindle motor 13, and the cover 108 is configured.

  As described above, the cover 108 is screwed and fixed to the column portion 71 by the spindle motor 13 according to the third embodiment of the present invention, and the rotor hub portion on which the disk is mounted due to some external factor such as a very large impact. Cover does not float from the tip of the column, the disk and the signal conversion element are similar to those in the first or second embodiment. Of the recording medium or the oscillating means for positioning the signal conversion element formed on the surface of the disk without causing fatal damage. And a spindle motor most suitable for a disk drive device.

  In the spindle motors of the first, second, and third embodiments, the configuration of the circumferentially opposed type (radial gap type) cored motor has been described. However, the present invention is not limited to this, and is not limited to this. Needless to say, the motor may be a facing type (axial gap type) motor with a core or a coreless motor.

  As described above, according to the present invention, when receiving excessive vibration, dropping, or other impact, the rotating bearing member, that is, the rotor hub portion does not come off from the fixed bearing member, and further, the disk due to the floating of the rotor hub portion. Excessive collision of the signal conversion element is suppressed, and the recording layer formed on the disk surface and the rocking means for positioning the signal conversion element are not fatally damaged, and have high impact resistance. Since a highly reliable spindle motor and disk drive device can be realized, a magnetic recording / reproducing device, a magneto-optical disk device, an optical disk device, etc. which can be applied to various information devices for recording / reproducing information at high density. It can be used as a head support device.

1 is a side cross-sectional view schematically showing a main configuration of a disk drive device including a spindle motor according to a first embodiment of the present invention. FIG. 2 is a plan cross-sectional view schematically illustrating a main configuration of a disk drive device including a spindle motor according to Embodiment 1 of the present invention. FIG. 4 is a partial cross-sectional view showing another example of the projecting portion of the chassis of the disk drive device including the spindle motor according to the first embodiment of the present invention. FIG. 2 is a partially enlarged sectional view showing a shape of a lubricant reservoir groove portion of the disk drive device including the spindle motor according to the first embodiment of the present invention. FIG. 4 is a side cross-sectional view schematically illustrating a main part configuration of another example of the spindle motor provided in the disk drive device according to the first embodiment of the present invention. Side sectional view showing an outline of a main configuration of a disk drive device including a spindle motor according to a second embodiment of the present invention. (A) is a side cross-sectional view schematically showing a configuration of a main part of a disk drive device provided with a spindle motor according to Embodiment 3 of the present invention. (B) is provided with a spindle motor having another configuration according to Embodiment 3 of the present invention. Side sectional view showing an outline of a main part configuration of a disk drive device Cross-sectional side view schematically showing a main part configuration of a disk drive device having a conventional spindle motor.

Explanation of reference numerals

DESCRIPTION OF SYMBOLS 1 Rotation center shaft 2,72 Rotor hub part 2a, 72a Hollow cylindrical part (circular hole part)
2b Flange part 2c Upper end face 3,73,173 Rotation side bearing member 3a, 173a Flange part 4 Rotation magnet 5,75,85 Rotation body 6,76,89 Fixed side bearing member 7,61,71 Column part 7a Flat part 7b , 61b Cylindrical portion 8, 78, 86 Chassis 8a, 18a Projection 9, 91b Coil 10, 91a Stator core 11, 91 Stator 12, Thrust suction plate 13, 92 Spindle motor 14, 90 Dynamic pressure lubricant 15, 93 Disk 16 Screw 17 Disc holding member 18, 62, 108 Cover 18b Abutment portion 41, 42, 43, 44 Lubricant storage groove 51 Mounting member 61c Female thread 63 Cover fixing screw 71a Upper female thread 71b Lower female thread 72b, 76a Center side 72c Annular protrusion Part 72d Outer side 72e Projecting part 73a Cover fixing screw 7 b chassis fixing screw 76b groove 76c end 81 rotary shaft 82 hub 83 rotor magnet 84 retaining ring 87 bearing sleeve 87a protrusion 88 thrust plate

Claims (18)

A chassis, a rotating magnet, a rotating-side bearing member, and a rotor hub portion including a hollow circular portion disposed at a rotation center portion;
A column fixed to the chassis;
Having a wound coil, a stator disposed on the chassis so as to face the rotating magnet,
The support portion is disposed on the chassis so as to pass through the hollow hole portion of the rotor hub portion,
A bearing for supporting the rotor hub portion by the fixed bearing member and the rotating bearing member arranged on the chassis,
The spindle motor according to claim 1, wherein the bearing is disposed at a position away from the support. A thrust bearing portion in which a dynamic pressure generating groove is formed on one of the axially opposed surfaces of the rotating side bearing member and the fixed side bearing member,
A radial bearing portion in which a dynamic pressure generating groove is formed on one of radially opposed surfaces of the rotating side bearing member and the fixed side bearing member,
The spindle motor according to claim 1, further comprising a fluid bearing made of: The spindle motor according to claim 1, wherein the rotor hub portion and the rotation-side bearing member are integrally formed. The support portion for fixing the fixed-side bearing member includes a flat portion and a cylindrical portion,
The spindle motor according to any one of claims 1 to 3, wherein the plane portion and the column portion are integrally formed by individual members. The spindle motor according to any one of claims 1 to 3, wherein the support portion to which the fixed-side bearing member is fixed includes only a cylindrical portion. The said chassis has a protrusion part in the said column part side of the said support | pillar part, The height of the said protrusion part is set higher than the height of the said fixed side bearing member, The Claims 1-5 characterized by the above-mentioned. The spindle motor according to any one of the above. The spindle motor according to any one of claims 1 to 5, wherein the rotor hub portion has a protrusion between the rotation-side bearing member and a fixing portion of the rotating magnet. A portion of the protruding portion of the chassis that protrudes from an upper end surface of the fixed-side bearing member is formed in a tapered shape such that a distance from the upper end surface of the fixed-side bearing member decreases as the diameter of the protruding portion decreases. The spindle motor according to claim 6, wherein The spindle motor according to any one of claims 1 to 8, wherein the support portion has a screw portion at a tip portion of the column portion. A chassis, a rotating magnet, a rotating-side bearing member, a rotor hub portion including a hollow circular hole portion disposed at a rotation center portion, a support portion fixed to the chassis, and a wound coil; A stator disposed on the chassis so as to face a rotating magnet, wherein the support is disposed on the chassis so as to pass through the hollow circular hole of the rotor hub, and is disposed on the chassis. A disk drive device comprising a bearing that supports the rotor hub portion with a fixed-side bearing member and the rotating-side bearing member, wherein the bearing includes a spindle motor that is disposed at a position away from the support portion.
A disk having a recording layer formed on the surface thereof, which is mounted on the upper surface of the flange portion of the rotor hub portion of the spindle motor;
A cover having an abutting portion that abuts on one end of the cylindrical portion that forms the support portion of the spindle motor;
A signal conversion element for recording and reproducing on a recording layer formed on the disc;
Swing means for positioning the signal conversion element at a predetermined track position,
A disk drive device comprising: The support portion of the spindle motor has a screw portion at the tip of the cylindrical portion,
A through hole is provided at a position corresponding to the screw portion of the support portion in the contact portion of the cover,
The disk drive device according to claim 10, wherein the cover has a configuration in which the cover is brought into contact with a tip end surface of the column portion of the column portion through the through hole of the cover and screwed and fixed. A thrust bearing portion in which a dynamic pressure generating groove is formed on one of the axially opposed surfaces of the rotating side bearing member and the fixed side bearing member; and a radial direction of the rotating side bearing member and the fixed side bearing member. The disk drive device according to claim 10 or 11, further comprising: a fluid bearing including a radial bearing portion having a dynamic pressure generating groove formed on one of surfaces facing the surface. 13. The disk drive device according to claim 10, wherein the rotor hub portion and the rotation-side bearing member are formed integrally. The support portion for fixing the fixed-side bearing member includes a flat portion and a cylindrical portion,
14. The disk drive device according to claim 10, wherein the plane portion and the columnar portion are formed integrally by individual members. 14. The disk drive device according to claim 10, wherein the support portion to which the fixed-side bearing member is fixed includes only a cylindrical portion. 15. The said chassis has a protrusion part in the said column part side of the said support | pillar part, The height of the said protrusion part is set higher than the height of the said fixed side bearing member, The Claims 10-15 characterized by the above-mentioned. The disk drive device according to any one of the above items. The disk drive device according to any one of claims 10 to 15, wherein the rotor hub portion has a protrusion between the rotation-side bearing member and a fixing portion of the rotating magnet. A portion of the protruding portion of the chassis that protrudes from an upper end surface of the fixed-side bearing member is formed in a tapered shape such that a distance from the upper end surface of the fixed-side bearing member decreases as the diameter of the protruding portion decreases. 17. The disk drive device according to claim 16, wherein:

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