JP2007333124A - Damper enclosed with viscous fluid - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a damper with an anisotropy hard to come about a vibration damping characteristic even if the damper is downsized by thinning. <P>SOLUTION: Since an airtight container 15 is given a flat shape and the height of a container body 16 is made low, the airtight container 15 can be put to attachment even if a gap is small between a mechanical chassis 4 and an enclosure 7. Further, since an end part 20c of a tubular protrusion 20b is formed in a tapered shape by giving it an inclined surface with its inner edge projecting toward a lid body 17 rather than its outer edge, deformation load which acts on the airtight container 15 when it is crushed in the height direction (Z direction) of the container body 16 can be brought near to deformation load on the airtight container 15 in the width direction (X-Y directions) of the container body 16. Damping performance can be brought near to isotropy with respect to all directions (X-Y-Z directions). <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a vibration damping technique for a disk device such as an optical disk device or a magneto-optical disk device used for audio equipment, video equipment, information equipment, various precision equipment, etc. The present invention relates to a viscous fluid-filled damper that attenuates vibration of a supported body such as a mechanical chassis in which a mechanism is mounted.

  The disk device is a precision device that records or reproduces information on a disk by bringing an optical pickup or the like closer to the disk that rotates at high speed by a motor. For this reason, it is necessary to prevent malfunction caused by the vibration because it is vulnerable to internal vibration caused by rotation of the eccentric disk and external vibration transmitted from the outside of the device. Therefore, it is usual to dampen the vibration of the mechanical chassis by interposing a viscous fluid-filled damper between the mechanical chassis on which the disk reproducing mechanism is mounted and the housing.

  For example, as shown in FIG. 11, the viscous fluid-filled damper 1 according to the conventional example has a flexible portion 3 made of a rubber-like elastic body of the hermetic container 2 on a hard mounting shaft 5 provided in the mechanical chassis 4. In addition to being fixed, the lid portion 6 of the sealed container 2 is fixed to the housing 7 by the mounting screw N and is attached between the mechanical chassis 4 and the housing 7. On the other hand, the other end of the suspension spring 8 having one end attached to the housing 7 is attached to the mechanical chassis 4 and is supported in a floating state inside the housing 7. The disk device 9 elastically supports the mechanical chassis 4 in a floating state inside the housing 7 by using the viscous fluid-filled damper 1 and the suspension spring 8 together (Patent Documents 1 and 2).

  The viscous fluid-filled damper 1 has a configuration in which a viscous fluid 10 such as silicone oil is sealed in a sealed container 2 as shown in FIG. The sealed container 2 has one end side of a cylindrical peripheral wall portion 11 made of hard resin sealed with a flexible portion 3 and the other end side with a flange sealed with a lid portion 6 made of hard resin. The flexible portion 3 is formed with a cylindrical stirring cylinder portion 12 with a bottom, and the mounting shaft 5 is inserted into the accommodating recess 13.

The vibration damping effect of the viscous fluid-filled damper 1 is such that when vibration is applied to the disk device 9, the stirring cylinder portion 12 integrated with the mounting shaft 5 inserted into the receiving recess 13 is interlocked in the vertical and horizontal directions (three-dimensional direction). It is exhibited by the viscous resistance generated by stirring the viscous fluid 10 enclosed in the closed container 2. The sealed container 2 has a hollow cylindrical shape that is close to a cube in appearance so that it can easily exhibit attenuation performance in the three-dimensional direction.
JP 2001-57068 A JP 2003-139181 A

  Incidentally, the disk device 9 has been reduced in size and thickness in order to reduce the mounting space. For this reason, it is necessary to reduce the gap between the mechanical chassis 4 and the housing 7, and it is required to reduce the size of the viscous fluid-filled damper 1 by reducing the thickness. However, if the existing viscous fluid-filled damper 1 is reduced as it is to reduce the overall size, the filling amount of the viscous fluid 10 is greatly reduced, and the damping performance is deteriorated. Therefore, it is conceivable to cope with the narrowing of the gap by reducing only the height of the viscous fluid-filled damper 1 to have a flat shape as a whole. However, in this case, the apparent spring constant in the height direction of the viscous fluid-filled damper 1 becomes larger than the apparent spring constant in the width direction, and there is a large difference in damping characteristics between the height direction and the width direction. . The occurrence of anisotropy in this vibration damping characteristic is considered to be caused by resistance caused by the entire bottom surface pressing the viscous fluid 10 when the stirring cylinder 12 is displaced in the height direction. However, when there is such anisotropy of the damping characteristic, the anisotropy of the damping characteristic is used in order to adapt to various demands of the installation form when the disk device 9 is used when considering countermeasures against vibration of the entire disk device 9. Therefore, there is a disadvantage that complicated and different vibration design must be performed in the height direction and the width direction of the viscous fluid-filled damper 1 so as to avoid as much as possible.

  The present invention has been made against the background of the prior art as described above. That is, an object of the present invention is to provide a viscous fluid-filled damper that is less likely to cause anisotropy in vibration damping characteristics even if the size is reduced due to a reduction in thickness.

  And this invention which achieves the said objective is comprised as follows.

  That is, the present invention includes a sealed container composed of a container body and a lid that closes the open end of the container body, and a viscous fluid sealed in the sealed container, and the sealed container includes a support body and a supported body. For the viscous fluid-filled damper that damps the vibration of the supported body by the viscous resistance of the viscous fluid, the hermetic container has a flat shape, and the container body protrudes from the inner surface of the container body toward the lid body. There is provided a viscous fluid-filled damper having a stirring protrusion for stirring a fluid, and an end portion on the lid side of the stirring protrusion having a tapered shape.

  In the present invention, the sealed container has a flat shape. That is, the container body is made shallow and the height of the sealed container is lowered, which is different from the shape similar to a cube in appearance as in the above-described conventional example. For this reason, even if the clearance gap between a support body and a to-be-supported body is small, an airtight container can be attached.

  A problem in the case of a flat shape is the manifestation of the anisotropy of the vibration damping characteristics described above. In order to solve this, in the present invention, the container body has a stirring protrusion that protrudes from the inner surface toward the lid and stirs the viscous fluid, and the end of the stirring protrusion on the lid side is tapered. For this reason, when the closed container is crushed in the height direction (Z direction) of the container main body, the displacement resistance of the stirring protrusion pushed into the viscous fluid can be reduced. Therefore, the stirring protrusion is easily pushed into the viscous fluid, and the deformation load of the sealed container that is crushed in the Z direction can be reduced. In this way, in the present invention, the deformation load of the sealed container that is crushed in the Z direction is reduced, and the deformation load of the closed container in the width direction (XY direction) of the container body can be approached. In other words, the attenuation performance in all directions (XYZ directions) can be made isotropic, and the occurrence of anisotropy in the attenuation characteristics when the sealed container is flattened can be suppressed. . As a result, in the present invention, since the gap between the support and the supported body can be designed to be small by the flat airtight container, it is possible to contribute to the reduction in size and thickness of the disk device.

  In the viscous fluid-filled damper according to the present invention, the stirring protrusion is a cylindrical protrusion having an opening on the lid side. Since the stirring protrusion is a cylindrical protrusion having an opening on the lid side, the inside of the cylindrical protrusion is filled with a viscous fluid. For this reason, as in the above-described conventional example, a larger filling amount of the viscous fluid can be secured than the solid-shaped stirring protrusion, and excellent damping performance due to the effect of increasing the viscous fluid can be exhibited. In addition, the damping performance can be improved by improving the stirring efficiency of the viscous fluid. That is, the cylindrical protrusion contacts the viscous fluid not only on the outer peripheral surface but also on the inner peripheral surface. In other words, the contact area between the cylindrical protrusion and the viscous fluid can be increased, and the stirring efficiency of the viscous fluid by the cylindrical protrusion that moves loosely under vibration can be increased. Therefore, a large viscous resistance can be exhibited and the vibration damping performance can be enhanced.

  In the viscous fluid-filled damper having the cylindrical protrusion, the end of the cylindrical protrusion forms an inclined surface whose inner edge is closer to the lid than the outer edge. For this reason, when the airtight container is crushed in the Z direction, the viscous fluid can easily flow to the side of the cylindrical protrusion along the inclined surface. Therefore, the deformation load of the sealed container that is crushed in the Z direction can be reduced, and the deformation load of the sealed container in the XY direction can be approached. Therefore, the attenuation performance in all directions (XYZ directions) can be made close to isotropic.

  In the viscous fluid-filled damper having the cylindrical protrusion, the lid projects from the inner surface of the lid to the inside of the cylindrical protrusion, and the inside of the cylindrical protrusion is caused by relative displacement between the support and the supported body. It has a rod-like protrusion that stirs the viscous fluid. Since the rod-shaped protrusion protrudes into the cylindrical protrusion, the viscous fluid inside the cylindrical protrusion can be efficiently stirred. Therefore, the viscous resistance of the viscous fluid can be efficiently exhibited, and the vibration damping performance can be enhanced.

  In the viscous fluid-filled damper according to the present invention, the stirring protrusion is configured as a comb-shaped protrusion. That is, since the comb-like projections stir the viscous fluid, the contact area with the viscous fluid can be increased. In addition, the viscous flow turbulent flow can be generated between the linear columnar comb teeth by the comb-like protrusions that float by receiving vibration. Therefore, the stirring efficiency of the viscous fluid is increased and a large viscous resistance can be exhibited, and the vibration damping performance can be enhanced.

  In the viscous fluid-filled damper according to the present invention, the stirring protrusion or the rod-shaped protrusion is formed with such a length that it can abut against the opposing surface when an impact displacement exceeding the vibration displacement that can be damped is applied. In general, in a disk device equipped with a viscous fluid-filled damper, a stopper made of a rigid sheet metal is attached separately from the viscous fluid-filled damper as means for forcibly stopping excessive displacement of the supported body relative to the support. However, in the present invention, the stirring protrusion or the rod-shaped protrusion comes into contact with the opposing surface when an excessive impact displacement exceeding the vibration that can be damped is applied. Therefore, a function equivalent to the above-described stopper made of sheet metal can be added to the viscous fluid-filled damper itself. This also prevents the viscous fluid-filled damper from being crushed.

  In this case, it is preferable that the stirring protrusion and the rod-shaped protrusion serving as the impact displacement regulating means are formed of a polymer. Since the polymer body has shock absorption, unlike the conventional stopper made of sheet metal, it can exhibit a buffering effect when the impact displacement regulating means abuts against the opposing portion. The polymer body is a hard resin, a soft resin, a rubber-like elastic body, or the like. Further, if the impact displacement regulating means is made of a material softer than the facing member, it can be brought into soft contact with the facing portion.

  The present invention relates to the viscous fluid-filled damper, wherein the container main body is fixed to the support or the supported body and has an agitation protrusion on the inner surface, and a flexible membrane made of a rubber-like elastic body that floats and supports the attachment part. , And the flexible film has a bellows shape in which an unevenness difference corresponding to the depth of the container body is formed. For this reason, the total length of the flexible membrane can be lengthened, and the tensile stress of the flexible membrane accompanying the displacement of the mounting portion can be reduced. In general, the tensile stress of the flexible membrane makes it difficult to deform the sealed container, and sometimes makes it difficult to cause viscous resistance of the viscous fluid. However, according to the present invention, since the tensile stress of the flexible membrane can be reduced, the sealed container can be easily deformed, and the viscous resistance of the viscous fluid can be increased. Furthermore, the flexible membrane has penetrated deeply into the container body, and this flexible membrane can stir the viscous fluid. Therefore, a sufficient vibration damping effect can be realized.

  According to the viscous fluid-filled damper of the present invention, the gap between the support and the supported body can be reduced by the flat airtight container. Further, when the sealed container is crushed in the Z direction of the container body, the displacement resistance of the stirring protrusion pushed into the viscous fluid can be reduced. Therefore, the stirring protrusion is easily pushed into the viscous fluid, the deformation load of the closed container that is crushed in the Z direction can be reduced, and the deformation load of the closed container in the XY direction of the container body can be approached. . That is, it becomes possible to suppress the expression of anisotropy in the attenuation characteristic when the closed container is flat. As a result, in the present invention, since the gap between the support and the supported body can be designed to be small by the flat airtight container, it is possible to contribute to the reduction in size and thickness of the disk device.

  Hereinafter, examples of embodiments of the present invention will be described with reference to the drawings. In addition, about the structure which is common in each embodiment, the same code | symbol is attached | subjected and duplication description is abbreviate | omitted.

First Embodiment [FIGS. 1 to 3]
The viscous fluid-sealed damper 14 of the first embodiment is configured to enclose the viscous fluid 10 in a sealed container 15. The sealed container 15 has a flat shape and is formed by fixing a container body 16 and a lid body 17 formed separately.

  As shown in FIG. 3, the container body 16 is hollow and has a lower end opened, and includes a peripheral wall portion 18, a flexible film 19, and a central attachment portion 20. Of these, the peripheral wall portion 18 is formed in a ring shape from a thermoplastic hard resin, more specifically, a polypropylene resin. An outer surface of the peripheral wall 18 has a locking surface 18a that engages with the mounting hole 7a of the housing 7, and an outer edge of the flexible film 19 is fixed to the upper end so as to close the upper end. The flexible film 19 is made of a rubber-like elastic body of a styrene thermoplastic elastomer and is formed in an annular shape in plan view. And it is formed in the deep bellows shape which faces the cover body 17 so that the unevenness | corrugation difference corresponded to the depth of the container main body 16 may be formed. A central mounting portion 20 is fixed to the inner edge of the flexible film 19. The central mounting portion 20 is formed of a thermoplastic hard resin, more specifically, a polypropylene resin. The central mounting portion 20 has a locking groove 20 a that engages with the mounting hole 4 a of the mechanical chassis 4, and further, a cylindrical cylindrical projection 20 b as an “agitating projection” is provided inward of the container body 16. It has been. The cylindrical protrusion 20b is open to the lid body 17 side, and the viscous fluid 10 is filled therein. And the edge part 20c by the side of the cover body 17 is formed in the taper-shaped inclined surface which an inner edge protrudes from an outer edge. The peripheral wall portion 18, the flexible film 19, and the central attachment portion 20 are formed by two-color molding.

  The lid 17 is formed in a disk shape from a thermoplastic hard resin, more specifically, a polypropylene resin. The lid body 17 is fixed to the peripheral wall portion 18 by ultrasonic fusion, and closes the lower end of the peripheral wall portion 18.

  Next, the disk device 21 including the viscous fluid-filled damper 14 of the present embodiment will be described. As shown in FIGS. 1 and 2, the disk device 21 includes a mechanical chassis 4, a housing 7 that houses the mechanical chassis 4, a viscous fluid-filled damper 14, and a suspension spring 8. A viscous fluid-filled damper 14 and a suspension spring 8 are attached between the mechanical chassis 4 and the housing 7.

  A mounting hole 7 a is provided in the housing 7, and a locking surface 18 a of the peripheral wall portion 18 in the viscous fluid-filled damper 14 is fixed. On the other hand, the mechanical chassis 4 is provided with a mounting hole 4a, and a locking groove 20a of the central mounting portion 20 in the viscous fluid-filled damper 14 is fixed. Therefore, the attachment structure of the viscous fluid-filled damper 14 of the present embodiment is the same as the attachment structure fixed by using the hard attachment shaft 5 provided in the mechanical chassis 4 such as the conventional viscous fluid-filled damper 1 shown in FIG. It is different.

  Here, the material of each member which comprises the viscous fluid enclosure damper 14 of this embodiment is demonstrated. In addition, the following description is common also to each below-mentioned embodiment.

  The “rubber-like elastic body” of the flexible membrane 19 is made of a material having a damping effect, and synthetic rubber is preferable in addition to the thermoplastic elastomer employed in the present embodiment. For example, as for the thermoplastic elastomer, in addition to the styrene thermoplastic elastomer employed as the flexible film 19 of the present embodiment, an olefin thermoplastic elastomer, a urethane thermoplastic elastomer, a vinyl chloride thermoplastic elastomer, and the like can be given. Examples of the rubber include butyl rubber, styrene butadiene rubber, chloroprene rubber, nitrile rubber, urethane rubber, silicone rubber, fluorine rubber, and acrylic rubber.

  The “hard resin” of the peripheral wall portion 18 and the central mounting portion 20 is the heat employed in the present embodiment due to required performance such as mechanical strength, heat resistance, durability, dimensional accuracy, reliability, and weight reduction and workability. In addition to plastic resins, thermosetting resins are preferred. For example, in addition to the polypropylene resin employed as the peripheral wall portion 18 and the central mounting portion 20 of the present embodiment, polyethylene resin, polyvinyl chloride resin, polystyrene resin, acrylonitrile / styrene / acrylate resin, acrylonitrile / butadiene / styrene resin, polyamide resin, Examples include polyacetal resins, polycarbonate resins, polyethylene terephthalate resins, polybutylene terephthalate resins, polyphenylene oxide resins, polyphenylene ether resins, polyphenylene sulfide resins, polyurethane resins, thermoplastic resins such as liquid crystal polymers, and composite resins thereof. As the thermosetting resin, an epoxy resin, a urethane resin, or the like can be used. Moreover, when the hard resin which has impact absorption property is used, the buffering effect of the member can be improved. In addition, when a thermoplastic resin is used for the hard resin and a thermoplastic elastomer is used for the rubber-like elastic body, two-color molding is possible.

  The material of the viscous fluid 10 is preferably a liquid or a liquid to which solid particles that do not react and dissolve in the liquid are added. Examples thereof include liquids such as silicone oils, paraffinic oils, ester oils, and liquid rubbers, or those obtained by adding solid particles that do not react and dissolve in these liquids. Of these, silicone-based oils are preferred as liquids due to required performance such as temperature dependency, heat resistance, and reliability. Specifically, dimethyl silicone oil, methyl phenyl silicone oil, methyl hydrogen silicone oil, fluorine-modified silicone are preferred. Examples of solid particles that react and do not dissolve in these silicone oils include silicone resin powder, polymethylsilsesquioxane powder, wet silica, dry silica, glass beads, glass balloons, etc., or surface treatment thereof. These are used alone or in combination.

  In order to manufacture the viscous fluid-filled damper 14 as described above, an injection molding machine for two-color molding is prepared. The peripheral wall portion 18 and the central mounting portion 20 made of polypropylene resin are molded with the first color mold. After the moving mold is rotated, the flexible film 19 made of a styrenic thermoplastic elastomer is molded by the second color mold. At this time, the peripheral wall 18, the central mounting portion 20, and the flexible film 19 are fixed by thermal fusion, and the container body 16 can be obtained. The viscous fluid 10 is injected into the container body 16 by a dispenser. Finally, a lid body 17 made of polypropylene resin, which is separately formed, is placed on the opening end of the container body 16, and the peripheral wall 18 of the container body 16 and the lid body 17 are fixed by ultrasonic fusion to obtain the viscous fluid-filled damper 14. Can do.

  Finally, the operation and effect of the viscous fluid-filled damper 14 will be described.

  According to the viscous fluid-filled damper 14, since the sealed container 15 is flat and the height of the container body 16 is low, the sealed container 15 can be attached even if the gap between the mechanical chassis 4 and the housing 7 is small. it can. Further, since the end portion 20c of the cylindrical projection 20b is formed in a tapered shape with an inner edge protruding from the outer edge toward the lid body 17, and is formed in a tapered shape, the sealed container 15 is formed in the height direction (Z direction) of the container body 16. When the fluid is crushed, the viscous fluid 10 can easily flow to the side of the cylindrical protrusion 20b along the inclined surface. Therefore, the deformation load of the sealed container 15 crushed in the Z direction can be reduced, and the deformation load of the closed container 15 in the width direction (XY direction) of the container body 16 can be approached. That is, the attenuation performance in all directions (XYZ directions) can be made isotropic, and the anisotropy of the attenuation characteristics when the sealed container 15 is flattened can be suppressed. Become. As a result, in this embodiment, since the gap between the mechanical chassis 4 and the housing 7 can be designed to be small by the flat airtight container 15, it is possible to contribute to the reduction in size and thickness of the disk device 21.

  Since the cylindrical projection 20b forms an opening on the lid 17 side, the viscous fluid 10 is filled in the cylindrical projection 20b. Therefore, the filling amount of the viscous fluid 10 can be secured more than the solid-shaped stirring protrusion as in the conventional example, and the excellent damping performance due to the increase effect of the viscous fluid 10 can be exhibited. Further, the cylindrical protrusion 20b can contact the viscous fluid 10 not only on the outer peripheral surface but also on the inner peripheral surface. In other words, the contact area between the cylindrical projection 20b and the viscous fluid 10 can be increased, and the stirring efficiency of the viscous fluid 10 by the cylindrical projection 20b that floats upon receiving vibration can be increased. Therefore, a large viscous resistance can be exhibited and the vibration damping performance can be enhanced.

  Since the flexible film 19 has a deep bellows shape in which the unevenness corresponding to the depth of the container body 16 is formed, the entire length of the flexible film 19 is long, rather than the elastic deformation of the material itself in the flexible film 19. The tensile stress of the flexible film 19 due to the displacement of the central mounting portion 20 can be reduced by the bellows shape deformation. Therefore, the sealed container 15 can be easily deformed, and the viscous resistance of the viscous fluid 10 can be increased. Furthermore, the deep bellows-shaped flexible membrane 19 penetrates deeply into the container body 16, whereby the viscous fluid 10 can be agitated. Therefore, a sufficient vibration damping effect can be realized.

  Further, since the mounting shaft 5 such as the viscous fluid-filled damper 1 of the conventional example is not required when mounting to the disk device 21, the number of parts of the disk device 21 can be reduced.

Second Embodiment [FIG. 4]
The viscous fluid-filled damper 22 of the second embodiment is different from the viscous fluid-filled damper 14 of the first embodiment in the structure of the lid 17. The remaining configuration and its operation and effect are the same as in the first embodiment.

  The lid body 17 is formed with a rod-like protrusion 17 a that protrudes from the inner surface toward the container body 16 at the center position. The tip of the rod-shaped protrusion 17a enters the stirring chamber 20d defined by the cylindrical protrusion 20b. That is, the protrusion length of the rod-shaped protrusion 17a is a length that can come into contact with the bottom surface of the opposing central mounting portion 20 when a large displacement due to shock vibration or shock exceeding the damping limit by the viscous fluid-filled damper 22 is applied. Yes.

  The viscous fluid-filled damper 22 of the second embodiment exhibits the same actions and effects as the viscous fluid-filled damper 14 of the first embodiment, and further exhibits the following actions and effects.

  Since the rod-shaped protrusion 17a enters the stirring chamber 20d defined by the cylindrical protrusion 20b, the rod-shaped protrusion 17a can efficiently stir the viscous fluid 10 inside the stirring chamber 20d. Therefore, the viscous resistance of the viscous fluid 10 can be exhibited efficiently, and the vibration damping performance can be enhanced.

  Further, since the movable stroke in the axial direction of the rod-shaped protrusion 17a is shorter than the movable stroke along the axial direction of the cylindrical protrusion 20b, the rod-shaped protrusion 17a functions as an impact displacement restricting means. In other words, the protrusion length of the rod-shaped protrusion 17a abuts against the bottom surface of the opposed central mounting portion 20 when a shocking vibration exceeding the vibration attenuation limit by the viscous fluid-filled damper 22 and a displacement due to the shock are applied. For example, when the mechanical chassis 4 is greatly displaced inside the casing 7 and a shocking vibration or impact is applied to crush the sealed container 15 in the Z direction, the rod-shaped protrusion 17a hits the opposing container body 16 and is excessive. Impact displacement is regulated. Thus, the rod-shaped protrusion 17a of this embodiment has a function as a stopper. Therefore, it is not necessary to provide a stopper member in addition to the viscous fluid-filled damper 22, the number of parts can be reduced, and the assembly of the disk device 21 can be simplified.

  And since the rod-shaped protrusion 17a is made of polypropylene resin, it can absorb more impact than a conventional stopper made of sheet metal. That is, the impact absorption of the polypropylene resin generated when the rod-shaped protrusion 17a comes into contact with the opposing container main body 16 and the buffering effect by the tip side flexing outward with respect to the shaft center after the contact to reduce the impact are exhibited. can do.

Third Embodiment [FIGS. 5 to 8]
The viscous fluid-filled damper 23 of the third embodiment is different from the viscous fluid-filled damper 14 of the first embodiment in the shape of the stirring protrusion 24 a of the central mounting portion 24. The remaining configuration and its operation and effect are the same as in the first embodiment.

  The central mounting portion 24 is formed of polypropylene resin, and has a locking groove 24b that engages with the mounting hole 4a of the mechanical chassis 4 in the same manner as the central mounting portion 20 of the first embodiment. However, unlike the cylindrical protrusion 20b of the first embodiment, the “stirring protrusion” is a comb-like protrusion 24a in which a plurality of linear columnar protrusions are gathered. The protrusion length of the comb-like protrusion 24a is longer than that of the cylindrical protrusion 20b of the first embodiment, and the tip portion protrudes to a position parallel to the bottom of the valley in the bellows shape of the flexible film 19. That is, the projecting length is set to a length that allows contact with the facing lid 17 when a shock vibration or displacement due to impact exceeding the damping limit of the viscous fluid-filled damper 23 is applied. As shown in FIG. 7A, the shape of the comb-like protrusion 24a is a pointed shape gradually tapering from the base end toward the tip, and the tip is formed with a rounded spherical shape. Yes. Then, as shown in FIG. 8 showing the central attachment portion 24 from the bottom surface side, the comb-like protrusions 24a are arranged on the circular bottom surface of the central attachment portion 24 so as to stand widely from the center to the outer edge side. In addition to the shape of the third embodiment, the comb-like protrusion 24a has a tip formed on a flat surface as shown in FIG. 7 (B), and a longitudinal center as shown in FIG. 7 (C). A taper that gradually tapers from the tip to the tip can also be used.

  Next, operations and effects of the viscous fluid-filled damper 23 of the third embodiment will be described.

  According to the viscous fluid-filled damper 23, since the sealed container 15 is flattened and the height of the container body 16 is reduced, the sealed container 15 can be attached even if the gap between the mechanical chassis 4 and the housing 7 is small. it can. Further, since the comb-like protrusion 24a is formed in a pointed shape gradually tapering from the proximal end to the distal end, when the sealed container 15 is crushed in the height direction (Z direction) of the container body 16, The viscous fluid 10 can easily flow to the side of the comb-like protrusion 24a. Therefore, the deformation load of the sealed container 15 crushed in the Z direction can be reduced, and the deformation load of the closed container 15 in the width direction (XY direction) of the container body 16 can be approached. That is, the attenuation performance in all directions (XYZ directions) can be made isotropic, and the anisotropy of the attenuation characteristics when the sealed container 15 is flattened can be suppressed. Become. As a result, since the gap between the mechanical chassis 4 and the housing 7 can be reduced by the flat airtight container 15, the disk device 21 can be reduced in size and thickness.

  Since the comb-like protrusions 24a agitate the viscous fluid 10, the contact area with the viscous fluid 10 can be increased. Moreover, the turbulent flow of the viscous fluid 10 can be generated between the linear columnar comb-shaped projections 24a by the comb-shaped projections 24a that move loosely under vibration. Therefore, the stirring efficiency of the viscous fluid 10 is increased, a large viscous resistance can be exhibited, and the vibration damping performance can be enhanced.

  Further, the comb-like projections 24 a serve as impact displacement regulating means for the mechanical chassis 4 with respect to the housing 7. For example, when the mechanical chassis 4 excessively displaces inside the housing 7 and tries to crush the sealed container 15 in the Z direction, the comb-like projections 24a abut against the facing lid 17 to restrict excessive shock displacement. can do. Therefore, the comb-like projection 24a has a function as a stopper. Therefore, it is not necessary to provide a stopper or the like in addition to the viscous fluid-filled damper 23, the number of parts can be reduced, and the assembly of the disk device 21 can be simplified.

  Furthermore, since the comb-like projections 24a are made of polypropylene resin, the impact can be absorbed more than a conventional stopper made of sheet metal. That is, the shock absorbing effect of the polypropylene resin generated when the comb-like protrusion 24a comes into contact with the opposing lid 17, and the buffering effect by the tip side being bent outward with respect to the shaft center after the contact to alleviate the impact. Can be demonstrated.

Modification Examples of Each Embodiment In the viscous fluid-filled dampers 14, 22, and 23 of the first, second, and third embodiments, the stirring protrusions such as the cylindrical protrusion 20b and the comb-shaped protrusion 24a are formed of polypropylene resin. As shown, in the viscous fluid-filled damper 25 of this modification, the stirring protrusion can be formed of a rubber-like elastic body such as a styrene-based thermoplastic elastomer. As a representative example, a viscous fluid-filled damper 25, which is a modification of the viscous fluid-filled damper 23 of the third embodiment, is shown in FIG. In this way, when the comb-like projection 26 collides with the lid body 17, the comb-like projection 26 softly collides with the lid body 17, and a buffering effect can be exhibited.

  In addition, in the viscous fluid-filled dampers 14, 22, and 23 of the first, second, and third embodiments, the bellows shape of the flexible film 19 is illustrated with a uniform wall thickness, but the viscous fluid-filled damper 27 of this modification example. Then, the stirring protrusion 28 which protrudes inside from the inner surface of the flexible film 19 can also be provided. As a representative example, a viscous fluid-filled damper 27, which is a modification of the viscous fluid-filled damper 14 of the first embodiment, is shown in FIG. The stirring protrusion 28 can be provided with a number of columnar protrusions, or a plurality of annular protrusions can be provided concentrically with the flexible film 19. If it does in this way, when the flexible part 19 deform | transforms, the contact area will increase by the stirring protrusion 28, the viscous fluid 10 can be stirred more effectively, and vibration damping performance can be improved.

  In the viscous fluid-filled dampers 14 and 22 of the first and second embodiments, the cylindrical protrusion 20b is formed. However, in this modified example, the cylindrical protrusion 20b is provided with a through-hole or slot formed by a round hole or a long hole, for example. A flow hole for the viscous fluid 10 such as a groove may be formed. If there is such a flow hole, the viscous fluid 10 can easily flow between the inside and outside of the cylindrical protrusion 20b, and the stirring efficiency can be increased. Therefore, the viscous resistance of the viscous fluid 10 can be exhibited efficiently, and the vibration damping performance can be enhanced.

  In the first embodiment, the cylindrical projection 20b does not have a length that restricts a large impact displacement of the mechanical chassis 4 (that is, does not function as a stopper), but the length is the same as that of the comb-like projection 24a of the third embodiment. You may make it form with the length which controls an impact displacement.

  In the second embodiment, an example in which the number of rod-shaped protrusions 17a is one has been described. However, two or more, for example, a plurality of the same number of comb-shaped protrusions 24a in the third embodiment may be used.

Explanatory drawing of the disc apparatus which attached the viscous fluid enclosure damper of 1st Embodiment. Sectional drawing of the viscous fluid enclosure damper of FIG. Sectional drawing of the container main body of the viscous fluid enclosure damper of FIG. Sectional drawing of the viscous fluid enclosure damper of 2nd Embodiment. Sectional drawing of the viscous fluid enclosure damper of 3rd Embodiment. Sectional drawing of the container main body of the viscous fluid enclosure damper of FIG. FIG. 6 is an explanatory view of the shape of the stirring protrusion of the viscous fluid-filled damper of FIG. The bottom view of the center attachment part which shows arrangement | positioning of the stirring protrusion of the viscous fluid enclosure damper of FIG. Sectional drawing which shows the modification of the viscous fluid enclosure damper of 3rd Embodiment. Sectional drawing which shows the modification of the viscous fluid enclosure damper of 1st Embodiment. An explanatory view of a disk device to which a viscous fluid-filled damper of a conventional example is attached. Sectional drawing of the viscous fluid enclosure damper of FIG.

Explanation of symbols

1 Damper filled with viscous fluid (One conventional example)
DESCRIPTION OF SYMBOLS 2 Airtight container 3 Flexible part 4 Mechanical chassis 4a Mounting hole 5 Mounting shaft 6 Lid part 6a Hole 7 Case 7a Mounting hole 8 Hanging spring 9 Disk apparatus (conventional)
DESCRIPTION OF SYMBOLS 10 Viscous fluid 11 Peripheral wall part 12 Stirring cylinder part 13 Storage recessed part 14 Viscous fluid enclosure damper (1st Embodiment)
DESCRIPTION OF SYMBOLS 15 Airtight container 16 Container main body 17 Cover body 17a Rod-shaped protrusion 18 Peripheral wall part 18a Locking surface 19 Flexible film 20 Center attachment part 20a Locking groove 20b Cylindrical protrusion (stirring protrusion)
20c End 20d Stirring chamber 21 Disk device 22 Viscous fluid-filled damper (second embodiment)
23 Damper filled with viscous fluid (Third embodiment)
24 Center mounting part 24a Comb-like protrusion (stirring protrusion)
25 Damper filled with viscous fluid (Modification of the third embodiment)
26 Comb-shaped protrusion (stirring protrusion)
27 Viscous Fluid Enclosed Damper (Modification of First Embodiment)
28 Stirring protrusion N Mounting screw

Claims (7)

A sealed container composed of a container body and a lid that closes the open end of the container body, and a viscous fluid sealed in the sealed container, and the sealed container is fixed to the support body and the supported body. In the viscous fluid-filled damper that attenuates the vibration of the supported body by the viscous resistance of the viscous fluid,
The sealed container has a flat shape,
A viscous fluid-filled damper, characterized in that the container body has a stirring protrusion that protrudes from the inner surface of the container body toward the lid and stirs the viscous fluid, and the end on the lid side of the stirring protrusion is tapered.   The viscous fluid-filled damper according to claim 1, wherein the stirring protrusion is a cylindrical protrusion having an opening on the lid side.   The viscous fluid-filled damper according to claim 2, wherein the end of the cylindrical protrusion forms an inclined surface whose inner edge is closer to the lid than the outer edge.   The lid body protrudes from the inner surface of the lid body to the inside of the cylindrical protrusion, and has a rod-shaped protrusion that stirs the viscous fluid inside the cylindrical protrusion in accordance with the relative displacement of the support body and the supported body. 3. The viscous fluid-filled damper according to 3.   The viscous fluid-filled damper according to claim 1, wherein the stirring protrusion is a comb-shaped protrusion.   The viscous fluid according to any one of claims 1 to 5, wherein the stirring protrusion or the rod-shaped protrusion is formed with a length capable of abutting on the opposite surface when an impact displacement exceeding the vibration displacement that can be damped is applied. Enclosed damper. The container body is provided with an attachment portion that is fixed to the support body or the support body and has a stirring protrusion on the inner surface, and a flexible film made of a rubber-like elastic body that floats and supports the attachment portion,
The viscous fluid-filled damper according to any one of claims 1 to 6, wherein the flexible film has a bellows shape in which an unevenness difference corresponding to the depth of the container body is formed.

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