JP2007177819A - Damper filled with viscous fluid - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide dampers filled with viscous fluid capable of contributing to reduction in the size of a disk device and achieving a sufficient vibration damping effect with respect to relative displacement in all directions. <P>SOLUTION: Since closed vessels 16 have a thinner shape compared with conventional ones, mounting spaces of the dampers 15 filled with viscous fluid 10 are reduced and the disk device 19 can be miniaturized. Since expanded/contracted bellows face parts 18 are provided in bottom parts 17b, the bottom parts 17b can be easily deformed, so as to promote stirring of the viscous fluid 10 and achieve the vibration damping effect due to viscous resistance. When a mechanical chassis 4 is relatively displaced with respect to a case body 7, inside mounting parts 17e are interlocked and outer cylindrical parts 17a, the bottom parts 17b and inner cylindrical parts 17c are deformed, so as to stir the viscous fluid 10. Therefore, even when stirring cylindrical parts projecting to inside of the closed vessels in conventional cases are not provided, the vibration damping effect by the stirring of the viscous fluid 10 can be achieved. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a disk-shaped recording medium (hereinafter referred to as “disk”) such as a hard disk drive (HDD) and a compact disk (CD) used for audio equipment, video equipment, information equipment, etc. The present invention relates to a vibration damping technique for a disk device that reproduces information recorded on the disk. In particular, the present invention relates to a viscous fluid-filled damper that damps vibrations of a mechanical chassis on which a disk reproducing mechanism is mounted.

  A disk device is a precision device that records or reproduces information on a disk by bringing a magnetic head or an optical pickup close to the disk that rotates at high speed by a motor. Therefore, it is vulnerable to internal vibration caused by rotation of the eccentric disk and external vibration transmitted from the outside of the device, and it is necessary to prevent malfunction caused by them. 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. 19, 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 on 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. In the conventional disk device 9, the mechanical chassis 4 is elastically supported in a floating state inside the housing 7 by using the viscous fluid-filled damper 1 and the suspension spring 8 together (Patent Document 1).

  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 housing recess 13 is interlocked vertically and horizontally so that the inside of the sealed container 2 is It is exhibited by viscous resistance generated by stirring the viscous fluid 10 enclosed in the container.

  Incidentally, the disk device 9 has been reduced in size and thickness in order to reduce the mounting space and to be mounted on a portable device. For this reason, it is necessary to reduce the gap between the mechanical chassis 4 and the housing 7, and it is also necessary to reduce the viscous fluid-filled damper 1. However, when the viscous fluid-filled damper 1 is made small, the stirring cylinder portion 12 hits the inner wall surface of the closed container 2 and the viscous fluid 10 cannot be sufficiently stirred, so that it cannot be made sufficiently small.

Therefore, in order to avoid the above problems, a viscous fluid-filled damper 14 is proposed in which the sealed container 2 is formed into a bag shape with a flexible film as shown in FIG. Second conventional example). The viscous fluid-filled damper 14 is attached in a state of being in surface contact with the mechanical chassis 4 and the housing 7, and when the mechanical chassis 4 and the housing 7 are relatively displaced, the hermetically sealed container 2 is deformed and sealed inside. By causing the fluid 10 to flow, a vibration damping effect is exhibited. (Patent Document 2).
JP 2002-242977 A JP 2004-278600 A

  The viscous fluid-filled damper 14 according to the second conventional example does not have the stirring cylinder portion 12 like the viscous fluid-filled damper 1, and the sealed container 2 can be made small. But there are new problems. That is, when the mechanical chassis 4 and the housing 7 are relatively displaced and the gap between the two becomes small, the hermetic container 2 is crushed and the internal pressure of the viscous fluid 10 is increased, which may reduce the damping characteristic and cause a sound skip phenomenon. It is.

  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 can contribute to miniaturization of a disk device and can obtain a sufficient vibration damping effect with respect to relative displacement in all directions.

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

  That is, the present invention includes a sealed container made of a flexible film and a viscous fluid sealed in the sealed container, and is attached between the support and the supported body to vibrate the supported body. In the viscous fluid-filled damper for damping the viscous fluid by the viscous resistance of the viscous fluid, the sealed container is provided on a hollow annular main body portion having an opposing bellows surface portion and enclosing the viscous fluid therein, and an outer peripheral portion of the main body portion. It has an outer mounting portion that is attached to either the support body or the supported body, and an inner mounting portion that is provided on the inner peripheral portion of the main body portion and is attached to either the support body or the supported body. A viscous fluid-filled damper is provided.

  In this invention, the main-body part of an airtight container is formed in a hollow ring shape. That is, the main body is formed in a thin shape as compared with the closed container as in the conventional example. For this reason, the space for installing the viscous fluid-filled damper is reduced. Therefore, it can contribute to size reduction of the disk device.

  Further, the main body portion has a bellows surface portion. Since the bellows surface portion freely expands and contracts, the main body portion is easily deformed. When the main body is easily deformed, stirring of the viscous fluid enclosed inside is promoted. Therefore, the vibration damping effect due to the viscous resistance of the viscous fluid can be exhibited.

  The sealed container is provided on the outer peripheral part of the main body part and attached to either the support body or the supported body, and to the other one of the support body or the supported body provided on the inner peripheral part of the main body part. And an inner mounting portion to be mounted. That is, when the supported body is moved relative to the support body, the outer mounting portion or the inner mounting portion is interlocked, and when the main body portion is deformed along with this interlocking, the viscous fluid sealed inside is stirred. Therefore, even if there is no stirring cylinder part which protrudes in the inside of an airtight container like a prior art example, the vibration damping effect by stirring of a viscous fluid can be exhibited.

  In the viscous fluid-filled damper according to the present invention, the thickness of the flexible film is made thinner than the outer attachment portion and the inner attachment portion. For this reason, the deformation | transformation stress of the main-body part of a flexible film is small, and deform | transforms softly. Therefore, an excellent vibration damping effect by stirring the viscous fluid can be exhibited. On the other hand, the outer mounting portion and the inner mounting portion that require mechanical strength are more difficult to break because they have larger deformation stress and tensile strength than the main body portion.

  In the viscous fluid-filled damper, the present invention has an inner mounting hole that penetrates the wall thickness in the inner mounting portion. For this reason, for example, if a pin hole is provided in the support body or the support body, and the fixing pin is inserted into the inner mounting hole and screwed into the pin hole, the viscous fluid-filled damper can be easily assembled to the disk device.

  In the viscous fluid-filled damper, the present invention has an outer mounting hole that penetrates through the thickness of the outer mounting portion. For this reason, if a pin hole is provided in, for example, the support body or the supported body, and the fixing pin is inserted into the outer mounting hole and screwed into the pin hole, the viscous fluid-filled damper can be easily obtained. It can be assembled to a disk device.

  In the viscous fluid-filled damper according to the present invention, the main body has a hollow annular shape. For this reason, since there is no corner | angular part which a viscous fluid retains without stirring in a main-body part, the viscous fluid enclosed inside the main-body part flows smoothly, and can exhibit effective damping property.

  Each of the above inventions can be further configured as follows.

  About the said viscous fluid enclosure damper, an outer side attachment part can be comprised as a cyclic | annular form. When the sealed container is deformed, the stress applied to the mounting portion is dispersed in the circumferential direction, and the specific part can be prevented from being stressed. Therefore, the sealed container can be hardly damaged.

  About the said viscous fluid enclosure damper, a sealed container can be comprised with a transparent flexible film. Since the viscous fluid can be confirmed through the sealed container, it is easy to identify a defective product in which air or foreign matter is mixed in the viscous fluid, and the production efficiency can be increased.

  About the said viscous fluid enclosure damper, the thickness of a flexible film can be comprised in 100 micrometers or less. Since a film having a thickness of 100 μm or less has a small tensile stress and easily deforms, it can sufficiently stir the viscous fluid and can exhibit an excellent vibration damping effect.

  According to the viscous fluid-filled damper of the present invention, the main body is formed in a thin shape as compared with the closed container as in the conventional example. For this reason, the space for installing the viscous fluid-filled damper can be reduced, and the disk device can be made smaller and thinner.

  Further, since the main body portion has the bellows surface portion, the main body portion is easily deformed. When the main body is easily deformed, stirring of the viscous fluid enclosed inside is promoted. Therefore, the vibration damping effect due to the viscous resistance of the viscous fluid can be exhibited.

  Furthermore, when the supported body is moved relative to the support body, the outer mounting portion or the inner mounting portion is interlocked. When the main body portion is deformed along with this interlocking, the viscous fluid enclosed inside is stirred. Therefore, even if there is no stirring cylinder part which protrudes in the inside of an airtight container like a prior art example, the vibration damping effect by stirring of a viscous fluid can be exhibited.

  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 5]
The viscous fluid-filled damper 15 of the first embodiment is configured to enclose the viscous fluid 10 in a sealed container 16. The sealed container 16 has a disk shape made of a transparent flexible film, and is formed by facing the bottom surfaces of two containers 17 and fixing them by thermocompression bonding.

  The container 17 has a dish-shaped shallow circular shape, and includes an outer cylinder portion 17a, a bottom portion 17b, an inner cylinder portion 17c, four outer attachment portions 17d, and an inner attachment portion 17e. The outer cylinder part 17a is cylindrical shape, The one end side is obstruct | occluded by the annular bottom part 17b. The bottom portion 17b is provided with an annular bellows surface portion 18 that spreads in a ripple shape from the inner periphery toward the outer periphery. The shapes of the bellows surface portions 18 of the two containers 17 are formed in parallel to each other. A cylindrical inner cylinder portion 17c that protrudes from the inner surface of the bottom portion 17b along the cylinder axis direction of the outer cylinder portion 17a is formed on the inner periphery of the bottom portion 17b. The length along the cylinder axis direction of the inner cylinder portion 17c is exactly the same as the length of the outer cylinder portion 17a, and a circular inner attachment portion 17e is provided on the axis, and the center of the inner attachment portion 17e is provided. The inner mounting hole 17f is formed through. The four outer mounting portions 17d are provided so as to protrude outward from the outer cylinder portion 17a, and a circular outer mounting hole 17g is formed through the outer mounting portion 17d. In the viscous fluid-filled damper 15 formed so as to face the bottom surface of the container 17 as described above, the outer cylinder portion 17a, the bottom portion 17b, and the inner cylinder portion 17c constitute a hollow annular “main body”.

  Next, an embodiment of the disk device 19 including the viscous fluid-filled damper 15 will be described. The disk device 19 includes a mechanical chassis 4, a housing 7, a viscous fluid-filled damper 15, and a suspension spring 8. A viscous fluid-filled damper 15 and a suspension spring 8 are attached between the mechanical chassis 4 and the housing 7.

  The casing 7 is provided with a projection 7a that protrudes from the inner surface thereof toward the mechanical chassis 4, and the outer mounting portion 17d of the viscous fluid-filled damper 15 is fixed. On the other hand, the mechanical chassis 4 is provided with a protrusion 4a that protrudes from the side surface toward the housing 7, and the inner mounting portion 17e of the viscous fluid-filled damper 15 is fixed.

  The protrusion 7a of the housing 7 is formed with a hole 7b that penetrates the thickness of the housing 7 and the protrusion 7a. A mounting screw N penetrates the hole 7 b of the housing 7 and the outer mounting hole 17 g of the outer mounting portion 17 d from the outer surface of the housing 7 and is screwed with the mounting nut M.

  A screw hole 4 b is formed at the tip of the protrusion 4 a of the mechanical chassis 4. The attachment screw N is inserted from the outside of the housing 7 into the inner attachment hole 17f of the inner attachment portion 17e through the through hole, and is screwed into the screw hole 4b.

  Here, the material of the viscous fluid-filled damper 15 of this embodiment will be described.

  The material of the “film” is preferably a thermoplastic resin film in view of dimensional accuracy, heat resistance, mechanical strength, durability, reliability, light weight, workability, and the like. For example, polyethylene resin, polypropylene resin, polyamide resin, polyvinyl chloride resin, polystyrene resin, acrylonitrile / styrene / acrylate resin, acrylonitrile / butadiene / styrene resin, polyacetal resin, polyethylene terephthalate resin, polybutylene terephthalate resin, polyphenylene oxide resin, polyphenylene A single material or a composite material such as a sulfide resin, a polyurethane resin, a polyphenylene ether resin, a modified polyphenylene ether resin, a polyketone resin, or a liquid crystal polymer can be used. Among these, a polyethylene resin, a polypropylene resin, a polyamide resin, a polyvinyl chloride resin, or the like having a lower elastic modulus than other materials can easily deform the sealed container 16. In addition, fillers such as powdered or fiber-shaped metals and glass can be added to thermoplastic resins to improve dimensional accuracy and heat resistance, and gas barrier properties can be achieved by forming metal-deposited films and multi-layered films. Can also be given.

  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.

  Next, functions and effects of this embodiment will be described.

  The viscous fluid-filled damper 15 is formed of a sealed container 16 with the bottom surface of a shallow circular container 17 made of a flexible film facing each other. That is, the sealed container 16 is formed in a thin shape as compared with the sealed container 2 as in the conventional example of FIG. For this reason, the space for installing the viscous fluid-filled damper 15 is reduced. Therefore, the disk device 19 can be reduced in size.

  Moreover, it has the bellows surface part 18 in the bottom part 17b. Since the bellows surface portion 18 freely expands and contracts, the bottom portion 17b is easily deformed. When the bottom portion 17b is easily deformed, stirring of the viscous fluid 10 enclosed therein is promoted. Therefore, the vibration damping effect due to the viscous resistance of the viscous fluid 10 can be exhibited.

  Further, an outer mounting portion 17d that is attached to the housing 7 is provided on the outer peripheral portion of the outer cylindrical portion 17a, and an inner mounting portion 17e that is attached to the mechanical chassis 4 is provided on the inner peripheral portion of the inner cylindrical portion 17c. That is, when the mechanical chassis 4 is moved relative to the casing 7, the inner mounting portion 17e is interlocked, and when the outer cylinder portion 17a, the bottom portion 17b, and the inner cylinder portion 17c are deformed along with this interlocking, the viscosity enclosed inside. The fluid 10 is agitated. The vibration damping effect by stirring the viscous fluid 10 can be exhibited even without the stirring cylinder portion 12 protruding inside the sealed container 2 as in the conventional example of FIG.

  Since the viscous fluid-filled damper 15 has the outer cylindrical portion 17a and the inner cylindrical portion 17c formed in a cylindrical shape, there is no corner portion where the viscous fluid 10 stays without being stirred. Therefore, the viscous fluid 10 enclosed in the inside of the airtight container 16 flows smoothly, and an effective damping property can be exhibited.

  The sealed container 16 is formed of a transparent flexible film. Since the viscous fluid 10 can be confirmed through the sealed container 16, it is easy to identify a defective product in which air or foreign matter is mixed in the viscous fluid 10, and the production efficiency can be increased.

  Since the inner mounting portion 17e has an inner mounting hole 17f that penetrates the wall thickness, if the mounting screw N is inserted into the inner mounting hole 17f and screwed into the screw hole 4b provided in the protrusion 4a of the mechanical chassis 4, The viscous fluid-filled damper 15 can be easily fixed to the mechanical chassis 4. Similarly, since the outer mounting portion 17d has an outer mounting hole 17g that penetrates through the wall thickness, if the mounting screw N is inserted into the hole 7b and the outer mounting hole 17g of the housing 7 and is screwed with the mounting nut M. The viscous fluid-filled damper 15 can be easily fixed to the housing 7. Therefore, the viscous fluid-filled damper 15 can be easily assembled to the disk device 19.

  In the viscous fluid-filled damper 15, when the inner mounting portion 17e moves, the bottom portion 17b having the expandable bellows surface portion 18 is deformed. For this reason, partial expansion of the sealed container 16 whose volume is increased can be avoided. Therefore, even when left in a deformed state for a long time, air can be prevented from entering the sealed container 16 and a sufficient vibration damping effect can be obtained.

  Here, the deformation | transformation of the bottom part 17b which has the above-mentioned bellows surface part 18 is demonstrated more concretely, referring FIG. 4 and FIG. When the disk device 19 receives vibration and the mechanical chassis 4 moves relative to the housing 7, the inner mounting portion 17 e of the viscous fluid-filled damper 15 is interlocked. Then, the bellows surface portion 18 is deformed. For example, FIG. 4 shows a state in which the inner attachment portion 17e has moved in the arrow direction X (upward direction in FIG. 4), and the upper bellows surface portion 18 contracts and deforms. On the other hand, the lower bellows surface 18 is extended and deformed. As a result, the viscous fluid 10 flows from the upper side to the lower side in FIG. 4, thereby generating a viscous resistance. Further, FIG. 5 shows a state in which the inner mounting portion 17e has moved in the arrow direction Y (right direction in FIG. 5), and the entire bellows surface portion 18 is extended rightward. As a result, the viscous fluid 10 is rubbed to generate viscous resistance.

Modified examples of the viscous fluid-filled damper 15 of the first embodiment (FIGS. 6 to 10)
Finally, a modified example of the viscous fluid-filled damper 15 will be described.

  As shown in FIG. 6, the viscous fluid-filled damper of the first modification is configured such that the shape of the bellows surface portion 18 of the two containers 17 is symmetrical (vertically symmetrical in FIG. 6) with respect to the fixing surface of the container 17. Yes. Even if it does in this way, the effect | action and effect similar to the viscous fluid enclosure damper 15 can be exhibited.

  As shown in FIG. 7, the viscous fluid-filled damper according to the second modified example includes a hermetic container 16 including a container body 17h and a lid body 17i. Even if it does in this way, if the viscous fluid 10 is inject | poured into the container main body 17h in a manufacturing process, and the same effect | action and effect as the viscous fluid enclosure damper 15 can be demonstrated, enclosure of the viscous fluid 10 will become easy and production efficiency will be improved. improves.

  As shown in FIG. 8, the viscous fluid-filled damper of the third modified example is configured such that the inner cylindrical portion 17c side is inclined in the same direction with respect to the bellows surface portion 18 of the two containers 17, and the sealed container 16 is configured in a dish shape. Yes. Even if it does in this way, since the effect | action and effect similar to the viscous fluid enclosure damper 15 can be exhibited, and also the capacity | capacitance of the viscous fluid 10 can be increased, the vibration damping effect can be heightened.

  As shown in FIG. 9, the viscous fluid-filled damper of the fourth modified example has one bellows surface portion 18 recessed in a V shape with respect to the bellows surface portions 18 of the two containers 17, and the other bellows surface portion 18 as its bellows surface portion. 18 is formed in a relative shape parallel to 18. Even if it does in this way, since the effect | action and effect similar to the viscous fluid enclosure damper 15 can be exhibited and also the capacity | capacitance of the viscous fluid 10 can be increased similarly to the 3rd modification, the vibration damping effect can be heightened.

  As shown in FIG. 10, the viscous fluid-filled damper of the fifth modified example has one bellows surface portion 18 recessed in a V shape with respect to the bellows surface portions 18 of the two containers 17, and the other bellows surface portion 18 as a fixing surface. It is configured symmetrically (vertical symmetry in FIG. 10). Even if it does in this way, since the effect | action and effect similar to the viscous fluid enclosure damper 15 can be exhibited, and also the capacity | capacitance of the viscous fluid 10 can be increased from a 3rd modification and a 4th modification, the vibration damping effect can be heightened.

Second Embodiment [FIGS. 11 and 12]
The viscous fluid-filled damper 20 of the second embodiment differs from the viscous fluid-filled damper 15 of the first embodiment in the thickness of the container 17 and the configuration of the outer mounting portion 17d. The remaining configuration is the same as in the first embodiment.

  The thickness of the flexible film constituting the container 17 is such that the “main body” constituted by the outer cylinder part 17a, the bottom part 17b, and the inner cylinder part 17c is formed thinner than the outer attachment part 17d and the inner attachment part 17e. Yes.

  The outer mounting portion 17d is provided in an annular shape, and four outer mounting holes 17g are formed therethrough.

  The viscous fluid-filled damper 20 of the second embodiment can contribute to the miniaturization of the disk device 19 like the viscous fluid-filled damper 15 of the first embodiment, can exhibit the vibration damping effect due to the viscous resistance of the viscous fluid 10, and is viscous. The fluid 10 can smoothly flow and exhibit effective damping, can easily identify a defective product in which air or foreign matter is mixed in the viscous fluid 10, and can be easily assembled to the disk device 19. In addition to preventing air from entering the inside of the hermetic container 16, the following actions and effects are exhibited.

  The viscous fluid-filled damper 20 is formed by thinning the outer cylinder part 17a, the bottom part 17b, and the inner cylinder part 17c enclosing the viscous fluid, so that the deformation stress of the flexible film is small and the film is expanded and contracted. It becomes easy to do and deforms flexibly. Therefore, an excellent vibration damping effect by stirring the viscous fluid 10 can be exhibited. On the other hand, because the outer mounting portion 17d and the inner mounting portion 17g are thick, the deformation stress and the tensile strength are increased, and it is difficult to break.

  Further, since the outer mounting portion 17d is formed in an annular shape and provided on the outer cylindrical portion 17a, when the outer cylindrical portion 17a, the bottom portion 17b, and the inner cylindrical portion 17c are deformed, the stress applied to the outer mounting portion 17d is circumferential. It is possible to prevent stress from being applied to specific parts. Therefore, the outer mounting portion 17d can be hardly damaged.

Third Embodiment [FIGS. 13 to 16]
The viscous fluid-filled damper 21 of the third embodiment is different from the viscous fluid-filled damper 15 of the first embodiment in the configuration of the outer mounting portion 17d. The remaining configuration is the same as in the first embodiment.

  The outer mounting portion 17d has no outer mounting hole 17g and is provided with an annular mounting protrusion 22 on the outer edge. The attachment protrusion 22 is bent when the one container 17 is manufactured.

  Next, a method for attaching the viscous fluid-filled damper 21 will be described. The mechanical chassis 4 is attached in the same manner as the viscous fluid-filled damper 15. For the housing 7, the outer mounting portion 17 d is placed on the protrusion 7 a so that the inner peripheral surface of the mounting protrusion 22 is in contact with the outer peripheral surface of the annular protrusion 7 a provided on the housing 7. Then, the mounting protrusion 22 is fastened and fixed to the protrusion 7 a by the washer 23 and the fixing pin 24.

  The viscous fluid-filled damper 21 of the third embodiment can contribute to the miniaturization of the disk device 19 like the viscous fluid-filled damper 15 of the first embodiment, can exhibit the vibration damping effect due to the viscous resistance of the viscous fluid 10, and is viscous. The fluid 10 can smoothly flow and exhibit effective damping, can easily identify a defective product in which air or foreign matter is mixed in the viscous fluid 10, and can be easily assembled to the disk device 19. In addition to preventing air from entering the inside of the hermetic container 16, the following actions and effects are exhibited.

  Since the viscous fluid-filled damper 21 is provided with an annular mounting projection 22 on the outer mounting portion 17d, if the mounting projection 22 is put on the annular projection 7a provided on the housing 7, a washer is formed from the outside of the mounting projection 22. 23 and the fixing pin 24 can be easily tightened and fixed. Therefore, the viscous fluid-filled damper 21 can be easily assembled to the disk device 19.

  Further, since the mounting protrusion 22 is formed in an annular shape and is fixed all around the protrusion 7a of the housing 7, when the closed container 16 is deformed, the stress applied to the mounting protrusion 22 is dispersed in the circumferential direction, Since it can prevent that a specific part is stressed, it can make it difficult to damage the attachment protrusion 22 and the airtight container 16.

Fourth Embodiment [FIGS. 17 to 18]
The viscous fluid-filled damper 25 of the fourth embodiment is different from the viscous fluid-filled damper 15 of the first embodiment in the configuration of the outer mounting portion 17d. The remaining configuration is the same as in the first embodiment.

  The outer mounting portion 17d has no outer mounting hole 17g and is provided with eight notches 26 on the outer edge.

  Next, a method for attaching the viscous fluid-filled damper 21 will be described. The mechanical chassis 4 is attached in the same manner as the viscous fluid-filled damper 15. The casing 7 is bent at a mountain fold line 27 shown in FIG. 17 to form eight bent portions 28 in an annular projection. At this time, no crease is formed in the bent portion 28 by the notch 26. The bent portion 28 is put on an annular protrusion 7 a provided on the housing 7, and the bent portion 28 is fixed by a washer 23 and a fixing pin 24 from the outside of the bent portion 28 in the same manner as the viscous fluid-filled damper 21 of the third embodiment. Is fixed to the protrusion 7a.

  The viscous fluid-filled damper 25 according to the fourth embodiment can contribute to downsizing of the disk device 19 as well as the viscous fluid-filled damper 15 according to the first embodiment, can exhibit the vibration damping effect due to the viscous resistance of the viscous fluid 10, and is viscous. The fluid 10 can smoothly flow and exhibit effective damping, can easily identify a defective product in which air or foreign matter is mixed in the viscous fluid 10, and can be easily assembled to the disk device 19. In addition to preventing air from entering the inside of the hermetic container 16, the following actions and effects are exhibited.

  The viscous fluid-filled damper 25 is provided with eight notches 26 in the outer mounting portion 17d. Therefore, even if the outer mounting portion 17d is bent at the mountain fold line 27 and the bent portion 28 is formed as an annular projection, the notch No wrinkles are formed by 26. If the bent portion 28 is placed on the annular protrusion 7 a provided on the housing 7, the outer mounting portion 17 d can be easily and securely fastened and fixed by the washer 23 and the fixing pin 24 from the outside of the bent portion 28. Therefore, the viscous fluid-filled damper 25 can be easily assembled to the disk device 19.

Explanatory drawing of the disc apparatus which attached the viscous fluid enclosure damper of 1st Embodiment. The top view of the viscous fluid enclosure damper of 1st Embodiment. FIG. 3 is a sectional view taken along line SA-SA in FIG. 2. Operation | movement explanatory drawing of the viscous fluid enclosure damper of 1st Embodiment. Operation | movement explanatory drawing of the viscous fluid enclosure damper of 1st Embodiment. Sectional drawing of the modification of the viscous fluid enclosure damper of 1st Embodiment. Sectional drawing of the modification of the viscous fluid enclosure damper of 1st Embodiment. Sectional drawing of the modification of the viscous fluid enclosure damper of 1st Embodiment. Sectional drawing of the modification of the viscous fluid enclosure damper of 1st Embodiment. Sectional drawing of the modification of the viscous fluid enclosure damper of 1st Embodiment. The top view of the viscous fluid enclosure damper of 2nd Embodiment. SB-SB sectional view taken on the line of FIG. The top view of the viscous fluid enclosure damper of 3rd Embodiment. SC-SC sectional view taken on the line of FIG. The principal part expansion explanatory drawing of the disc apparatus which attached the viscous fluid enclosure damper of 3rd Embodiment. SD-SD sectional view taken on the line of FIG. The top view of the viscous fluid enclosure damper of 4th Embodiment. SC-SC sectional view taken on the line of FIG. 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. Sectional drawing of the viscous fluid enclosure damper by a 2nd prior art example.

Explanation of symbols

1 Damper filled with viscous fluid (One conventional example)
2 Sealed Container 3 Flexible Part 4 Mechanical Chassis 5 Mounting Shaft 6 Lid Part 6a Hole 7 Case 8 Hanging Spring 9 Disc Device (Conventional)
DESCRIPTION OF SYMBOLS 10 Viscous fluid 11 Peripheral wall part 12 Stirring cylinder part 13 Storage recessed part 14 Viscous fluid enclosure damper (2nd prior art example)
15 Damper filled with viscous fluid (first embodiment)
16 Sealed container 17 Container 17a Outer cylinder part 17b Bottom part 17c Inner cylinder part 17d Outer attachment part 17e Inner attachment part 17f Inner attachment hole 17g Outer attachment hole 17h Container body 17i Lid body 18 Bellows surface part 19 Disk device 20 Viscous fluid enclosure damper (first Second embodiment)
21 Damper filled with viscous fluid (Third embodiment)
22 mounting projection 23 washer 24 fixing pin 25 viscous fluid-filled damper (fourth embodiment)
26 Notch 27 Mountain fold line 28 Bending part M Mounting nut N Mounting screw

Claims (5)

A sealed container made of a flexible film and a viscous fluid enclosed in the sealed container are attached between the support and the supported body to reduce the vibration of the supported body. In a viscous fluid-filled damper that is attenuated by resistance,
The sealed container has a hollow annular main body portion that has an opposing bellows surface portion and encloses a viscous fluid therein, and an outer mounting portion that is provided on an outer peripheral portion of the main body portion and is attached to either the support body or the supported body. And a viscous fluid-filled damper having an inner mounting portion provided on the inner peripheral portion of the main body portion and attached to either the support body or the supported body.   The viscous fluid-filled damper according to claim 1, wherein the thickness of the flexible film is made thinner than the outer attachment portion and the inner attachment portion.   The viscous fluid-filled damper according to claim 1, wherein the inner mounting portion has an inner mounting hole penetrating the wall thickness.   The viscous fluid-filled damper according to claim 1, wherein the outer mounting portion has an outer mounting hole penetrating the wall thickness.   The viscous fluid-filled damper according to claim 1, wherein the main body has a hollow annular shape.

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