JP2006038218A - Viscous fluid enclosed damper - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a viscous fluid enclosed damper capable of miniaturizing a disk device by securely supporting to anti-vibrate the disk device even if abolishing to use a coil spring supporting mechanical chassis. <P>SOLUTION: The viscous fluid enclosed damper 10 is provided with a peripheral wall part 16 comprising a rubbery elastic body. The peripheral wall 16 engages with an inner edge for engaging mounting strip of the mechanical chassis and forms a mounting groove 16a supporting plate surface of the mounting strip in surface contact. Therefore, weight of the mechanical chassis is dispersedly supported by support by means of surface contact at the mounting groove 16a. Consequently, the damper can support to anti-vibrate the mechanical chassis without the peripheral wall part 16 comprising a rubbery elastic body causing excessive deformation and can miniaturize the disk device even if abolishing to use a coil spring supporting mechanical chassis like before. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to discs such as CDs, CD-ROMs, DVDs, DVD-ROMs, DVD-RAMs, and magneto-optical disks used for audio equipment, video equipment, information equipment, various precision equipments including in-vehicle use and consumer use. BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a vibration attenuating device provided in a disk device that reproduces a recording medium (hereinafter referred to as a disk). The present invention relates to a damper containing viscous fluid.

  The disk device includes a reproducing mechanism such as a spindle motor, a tracking motor, and an optical pickup, and the recorded data is reproduced by moving the optical pickup in the radial direction by the tracking motor while rotating the disk at a high speed by the spindle motor. Therefore, internal vibrations are generated by vibrations generated by the operation of various drive motors including the spindle motor and the tracking motor and vibrations generated by the rotation of the eccentric disk. Further, if it is an in-vehicle disk device, the traveling vibration acts on the mechanical chassis as disturbance vibration, and if it is a portable disk device, the vibration acts on the mechanical chassis as disturbance vibration. When internal vibration or disturbance vibration acts on the mechanical chassis, there may be a reproduction error that cannot be corrected by software means when reading recorded data. Therefore, a viscous fluid-filled damper having a vibration damping action is interposed between the mechanical chassis and the housing containing the mechanical chassis.

  For example, as shown in FIG. 14, the conventional viscous fluid-filled damper 1 has a structure in which a viscous fluid 3 having a vibration damping action such as silicone oil is sealed in a sealed container 2. The sealed container 2 includes a cylindrical peripheral wall portion 4 made of a hard resin such as polypropylene, a dome-shaped flexible portion 5 made of a soft resin such as a thermoplastic elastomer that closes one end of the peripheral wall portion 4, and the other end of the peripheral wall portion 4. And a substantially disc-shaped lid body 6 made of hard resin.

  The mounting structure is such that a pin-like shaft 7a protruding to the side of the mechanical chassis 7 is inserted into the stirring cylinder portion 5a of the flexible portion 5, and a screw N is inserted into a hole 6a penetrating the lid body 6. This is a structure in which this is screwed into the side surface 8 a of the housing 8.

According to the mounting structure of such a conventional viscous fluid-filled damper 1, the flexible portion 5 made of soft resin is deformed by the weight of the mechanical chassis 7, and a desired damping effect cannot be expected. Therefore, a plurality of coil springs 9 are attached between the mechanical chassis 7 and the housing 8 so that the weight of the mechanical chassis 7 is applied to the coil springs 9 so that the flexible part 5 is not distorted and deformed. Is normal (Patent Document 1, Patent Document 2).
Japanese Patent Laid-Open No. 2000-220681 (FIG. 3) Japanese Patent Laying-Open No. 2001-271867 (FIG. 9)

  However, when the coil spring 9 is used in combination, a corresponding space is required, and it is difficult to downsize the disk device as a whole.

  Further, since the viscous fluid-filled damper 1 supports the mechanical chassis 7 by inserting the shaft 7a into the stirring cylinder portion 5a, the viscous fluid-filled damper 1 is disposed between the side of the mechanical chassis 7 and the housing 8. A gap for mounting is necessary, and there is a limit to downsizing the disk device in the width direction. Therefore, in order to realize downsizing in the width direction, when the damper 1 is attached to the bottom surface 8b of the housing 8 as shown by a two-dot chain line in FIG. 14, the shaft 7a protruding downward from the mechanical chassis 7 is attached to the stirring cylinder portion. Since it is inserted into 5a, there is a limit to the miniaturization of the disk device in the height direction.

  The present invention has been made against the background of the prior art as described above, and an object of the present invention is to provide a viscous fluid-filled damper that can contribute to downsizing of the disk device.

  In order to achieve the above object, the present invention comprises a hollow sealed container and a viscous fluid filled in the sealed container, has a disk-shaped recording medium reproducing mechanism, and penetrates an end-ring-like engaging inner edge. A viscous fluid-filled damper for vibration-proofing and supporting a mechanical chassis on which a thin plate-shaped mounting piece is formed, wherein a peripheral wall portion made of a rubber-like elastic body is provided in a sealed container, and the mounting piece is provided on the peripheral wall portion. A viscous fluid-filled damper is provided in which a mounting groove is formed to engage with the engaging inner edge and support the plate surface of the mounting piece by surface contact.

  The viscous fluid-filled damper of the present invention is a conventional viscous-fluid-filled damper in which the shaft of the mechanical chassis is held by the stirring cylinder in that the mechanical chassis is supported in a vibration-proof manner. Is basically different from the structure of the anti-vibration support.

  That is, in the present invention, the sealed container is provided with a peripheral wall portion made of a rubber-like elastic body, and the peripheral wall portion is engaged with the inner edge for engagement of the attachment piece, and the plate surface of the attachment piece is supported by surface contact. As a configuration for forming the mounting grooves, the mounting pieces of the mechanical chassis are supported by surface contact by the mounting grooves, so that the weight of the mechanical chassis is dispersedly supported by the mounting grooves. For this reason, even if it does not use a coil spring together like a prior art example, it is possible to carry out the vibration-proof support of the mechanical chassis, without the surrounding wall part which consists of a rubber-like elastic body producing an excessive deformation | transformation. Therefore, it is possible to contribute to further downsizing the disk device by saving space.

  Moreover, according to the structure which engages the inner edge for engagement of an attachment piece with the attachment groove | channel of the surrounding wall part which consists of a rubber-like elastic body as mentioned above, the surface direction of a mechanical chassis (attachment piece), a surface perpendicular direction, and the diagonal direction Can be damped by the elastic deformation by the peripheral wall portion and the viscosity of the viscous fluid that freely flows in the hollow sealed container in response to the elastic deformation, and can exhibit good vibration isolation characteristics.

  As described above, the mounting piece of the mechanical chassis to be attached to the viscous fluid-filled damper is configured as a protrusion protruding laterally from the outer edge of the mechanical chassis, and the inner edge for engagement is formed on the plate surface facing the outer edge of the mechanical chassis. The case where it is formed so as to penetrate and is not configured as a protrusion is included. Specifically, among the mechanical chassis anti-vibration structure comprising the mechanical chassis mounting piece and the viscous fluid-filled damper configured in these forms, the mounting piece is particularly related to the plate surface portion facing the outer edge of the mechanical chassis. In the case where the combined inner edge is formed so as to penetrate, the viscous fluid-filled damper is in the in-plane position of the mechanical chassis and does not protrude from the outer edge of the mechanical chassis, so that the disk device can be further downsized.

  By the way, the mechanical chassis is often formed of a rigid material such as a metal or a hard resin. For this reason, when it is set as the said structure which engages an attachment piece with an attachment groove | channel, an attachment piece rubs or collides continuously at the time of the vibration of a mechanical chassis, and wears the attachment groove | channel which consists of rubber-like elastic bodies. When wear progresses, the mounting groove is broken and the viscous fluid may leak from the sealed container. Accordingly, the present invention solves this problem by adding, for example, the following configuration to the viscous fluid-filled damper.

  That is, a 1st structure is a structure which provides a hard part in the groove | channel inner surface of the attachment groove which the inner edge for engagement of an attachment piece opposes. According to this, since the inner edge for engagement of the mounting piece rubs or collides with the hard part of the inner surface of the mounting groove (bottom surface of the groove), the mounting groove made of a rubber-like elastic body in this respect. Durability can be improved.

  The hard portion according to the first configuration is preferably formed over the groove width of the groove inner side surface (bottom surface of the groove) from the viewpoint of reliably avoiding wear of the rubber-like elastic body on the side surface. However, the hard portion on the inner surface of the groove may be divided into an upper hard portion and a lower hard portion, and an intermediate soft portion made of a rubber-like elastic body may be provided between the upper portion and the lower portion. According to this, since the mounting groove can be expanded and contracted in the groove width direction by the deformable intermediate soft part, the deflection of the mounting piece that is displaced by vibration or impact can be suppressed by the deformation of the intermediate soft part. In addition, wear of a rubber-like elastic body can be suppressed by making the width | variety of such an intermediate | middle soft part smaller than the plate | board thickness of an attachment piece.

  A 2nd structure is a structure which provides a hard part in at least any one of the groove | channel upper surface or groove | channel lower surface of a mounting groove where the plate | board surface of a mounting piece opposes. According to this, since the plate surface of the mounting piece rubs or collides with at least one of the hard portions on the upper surface in the groove or the lower surface in the groove, the mounting made of a rubber-like elastic body in this respect The durability of the groove can be improved.

  A 3rd structure is a structure which provides both the hard part of the inner surface of a groove | channel by a 1st structure, and the hard part of at least any one of an upper surface in a groove | channel or a lower surface in a groove | channel. According to this, the effect | action and effect of a 1st, 2nd structure can be exhibited.

  The hard portion taking the first to third configurations as an example as described above can be formed as an integral molded body by molding with a rubber-like elastic body forming the peripheral wall portion. According to this, strong fixation can be easily obtained by a molding method such as insert molding or two-color molding. Alternatively, the hard portion may be formed in a ring shape and fitted into the mounting groove.

  As a viscous fluid-filled damper that exhibits the same functions and effects as the hard part as described above, the present invention includes a hollow sealed container and a viscous fluid filled in the sealed container, A viscous fluid-filled damper that has a regenerative mechanism and is provided with a vibration-proof support for a mechanical chassis on which a thin plate-like mounting piece that is formed by penetrating an end edge of an annular engagement end is formed. A soft inner peripheral wall and a hard outer peripheral wall made of a hard material that is fixed to the outer peripheral surface of the soft inner peripheral wall. The hard outer peripheral wall engages with an inner edge for engagement of the mounting piece, and the plate of the mounting piece A viscous fluid-filled damper having a mounting groove for supporting a surface by surface contact is provided.

  According to this, since the mounting groove that engages with the inner edge for engagement of the mounting piece and supports the plate surface of the mounting piece by surface contact is formed on the hard outer peripheral wall, the mounting piece is the mounting groove of the hard outer peripheral wall. As a result, the durability of the mounting groove can be improved.

  About the viscous fluid enclosure damper of each above-mentioned this invention, a sealed container can be comprised as what was formed as a hollow column shape which obstruct | occluded the edge part.

  Further, in each of the viscous fluid-filled dampers of the present invention, a sealed container is formed as a hollow cylinder shape with its end closed, and a housing that houses a mechanical chassis on one end side of the inner peripheral portion of the hollow cylinder shape. On the other hand, a bottom plate having an insertion hole for a fixture for fixing the sealed container can be provided. According to this, since the sealed container has a hollow cylindrical shape and the center is vacant in the cylinder axis direction, the soft peripheral wall portion made of a rubber-like elastic body is compared with a viscous fluid-filled damper in which the sealed container has a hollow columnar shape. It can be deformed relatively greatly, and the stirring property and fluidity of the viscous fluid are enhanced. With this action, the viscous fluid-filled damper of the present invention can exhibit a high vibration damping effect on the mechanical chassis. Moreover, since it is not necessary to provide the fixing part of the fixture which fixes a viscous fluid enclosure damper outwardly in the form of a flange etc. like the prior art example, overall size reduction can be achieved.

  Further, each of the viscous fluid-filled dampers of the present invention is configured such that the hermetic container is formed in a hollow cylindrical shape whose end is closed, and the inner container of the hollow cylindrical shape is sealed with respect to the casing that houses the mechanical chassis. It can comprise as what provided the hard inner cylinder part which has the insertion hole of the fixture which fixes A. According to this, since it is not necessary to provide the fixing part of the fixture which fixes a viscous fluid enclosure damper outwardly in the form of a flange etc. like the prior art example, overall size reduction can be achieved.

  In the viscous fluid-filled damper of the present invention, the weight of the mechanical chassis can be dispersedly supported by supporting the mounting pieces of the mechanical chassis by surface contact by the mounting grooves, so that the coil springs for supporting the mechanical chassis need not be used together. The mechanical chassis can be supported in an anti-vibration manner without inconvenience that the peripheral wall portion made of a rubber-like elastic body is excessively deformed. Therefore, it is possible to contribute to further downsizing the disk device by saving space.

  In addition, since the mechanical chassis shakes in the three-dimensional direction can be attenuated by the elastic deformation by the peripheral wall portion and the viscosity of the viscous fluid that freely flows in the hollow sealed container under the elastic deformation, Good anti-vibration properties can be demonstrated. For this reason, for example, it is possible to cope with a case where high vibration damping performance is required such as a disk device for DVD reproduction for reproducing a disk recorded at high density with light of a short wavelength.

  Furthermore, according to the present invention in which the mounting groove is provided with a hard portion, the inner edge for engagement of the mounting piece is hard to wear even if it rubs or collides, and is highly durable. It can be used without any problem as a viscous fluid-filled damper for a disk device.

  An example of an embodiment of the present invention will be described with reference to the drawings.

First Embodiment [FIGS. 1 to 3] ; The viscous fluid-filled damper 10 of this embodiment includes a container body 11 and a lid 12 as a hollow columnar “sealed container”, and a viscous fluid 13 is provided in the container body 11 and the lid 12. Is filled. The container body 11 is composed of a soft portion 14 made of a rubber-like elastic body and a hard portion 15 made of a cylindrical hard material. The soft portion 14 includes a cylindrical peripheral wall portion 16 and a peripheral wall portion. The top surface portion 17 closes the upper end of the 16. The lid body 12 is made of a hard material, and has a protrusion 12a (see FIG. 2) that is fixed to the bottom surface 8b of the housing 8 of the disk device by a screw N.

  A mounting groove 16a is formed in the cylindrical peripheral wall portion 16 over the entire circumference. On the other hand, the mechanical chassis 18 is formed with an attachment piece 18a protruding from the side surface (see FIG. 3), and the attachment piece 18a is formed with an engagement inner edge 18b having a circumferential shape and a relative shape of the attachment groove 16a. The engaging inner edge 18b is inserted into the mounting groove 16a from the side as shown in FIG. The mechanical chassis 18 has such mounting pieces 18a formed at a plurality of locations (for example, four corners of the mechanical chassis 18), each of which is inserted into the mounting groove 16a of the viscous fluid-filled damper 10 as described above. Engage. Thus, as shown in FIG. 3, the mechanical chassis 18 is supported by the viscous fluid-filled damper 10 in a vibration-proof manner.

  The aforementioned soft portion 14 is made of a rubber-like elastic material, and specifically includes styrene butadiene rubber, butadiene rubber, chloroprene rubber, nitrile butadiene rubber, butyl rubber, urethane rubber, silicone rubber, fluorine rubber, acrylic rubber, and the like. A synthetic rubber having a damping effect can be used. Also, thermoplastic elastomers such as styrene, olefin, urethane, ester and vinyl chloride can be used.

  Further, the hard part 15 and the lid 12 described above are made of a hard material, and specifically, thermoplastic resin, heat, and the like according to required performance such as dimensional accuracy, heat resistance, mechanical strength, durability, and reliability. Although a curable resin, a metal, etc. can be used, it is preferable to use a thermoplastic resin that is superior in weight reduction and workability. Thermoplastic resins include polyethylene resin, polypropylene resin, polyvinyl chloride resin, polystyrene resin, acrylonitrile / styrene / acrylate resin, acrylonitrile / butadiene / styrene resin, polyamide resin, polyacetal resin, polycarbonate resin, polyethylene terephthalate resin, poly Butylene terephthalate resin, polyphenylene oxide resin, polyphenylene sulfide resin, polyurethane resin, polyphenylene ether resin, modified polyphenylene ether resin, silicone resin, polyketone resin, liquid crystal polymer, or a composite material thereof can be used. To these thermoplastic resins, fillers such as powdered or fibrous metals, glass, fillers, etc. may be added to improve dimensional accuracy and heat resistance.

  The soft part 14, the hard part 15, and the lid body 12 as described above are preferable in order to obtain a liquid tightness required as a “sealed container”, and a viewpoint of a manufacturing method that realizes this fixing method. A specific material is selected. For example, from the viewpoint of realizing integral molding of the soft portion 14 and the hard portion 15 with a mold, a thermoplastic elastomer is used as the soft portion 14, and thermoplasticity that is fixed to the thermoplastic elastomer as a hard portion 15 by molding. From the viewpoint of using a resin (for example, polypropylene resin, acrylonitrile butadiene styrene resin) and ultrasonically fusing the lid 12 to the hard portion 15, the thermoplastic resin and the super resin of the hard portion 15 are used as the lid 12. A thermoplastic resin (for example, polypropylene resin, acrylonitrile butadiene styrene resin) that can be ultrasonically fused can be used. And according to this, the soft part 14 and the hard part 15 can be firmly fixed, for example, by mold integral molding such as insert molding or two-color molding, and the lid is formed by ultrasonic fusion. By fixing 12, the lid 12 can be integrated with the hard portion 15 instantly and firmly, and excellent liquid-tightness and high productivity can be realized.

  In addition, the viscous fluid 13 of the present embodiment is preferably a liquid and liquid particles to which solid particles that do not react and dissolve are added. Among these, silicone oil and those obtained by dispersing solid particles that do not react and dissolve in silicone oil can be used according to the required performance such as heat resistance, reliability, vibration proofing properties and vibration damping properties. As the silicone oil, dimethyl silicone oil, methylphenyl silicone oil, methyl hydrogen silicone oil, fluorine-modified silicone oil and the like can be used. Examples of solid particles that do not react or dissolve in silicone oil include silicone resin powder, polymethylsilsesquioxane powder, wet silica particles, dry silica particles, glass beads, and glass balloons, and surface treated products thereof. It is possible to use them alone or in combination of several kinds.

  According to the viscous fluid-filled damper 10 of the present embodiment as described above, the following actions and effects can be exhibited.

  The mounting groove 16 a of the peripheral wall portion 16 made of a rubber-like elastic body engages with the engaging inner edge 18 b of the mounting piece 18 a of the mechanical chassis 18, and the plate surface (upper surface and lower surface) of the mounting piece 18 a is the axial center of the peripheral wall portion 16. It supports by surface contact in the direction (plate thickness direction of the mounting piece 18a). Therefore, the weight of the mechanical chassis 18 is distributed and supported while receiving the internal pressure of the viscous fluid 13 filled in the “sealed container” at the portion where the mounting piece 18a is in surface contact with the mounting groove 16a. Accordingly, the peripheral wall portion 16 (soft portion 14) is formed of a rubber-like elastic body that can be easily elastically deformed without using the coil spring 9 that supports the mechanical chassis 7 as in the conventional disk device. However, there is no inconvenience that the peripheral wall portion 16 is deformed to such an extent that the desired vibration-proof performance cannot be exhibited due to the weight of the mechanical chassis 18, and the mechanical chassis 18 can be reliably supported in the vibration-proof manner. Therefore, the disk device can be further reduced in size by saving space.

  In order to engage the engaging inner edge 18b of the mounting piece 18a of the mechanical chassis 18 with the mounting groove 16a, the mechanical chassis 18 is shaken in the surface direction, the perpendicular direction, and the oblique direction by elastic deformation by the peripheral wall portion 16 and this elasticity. Due to the deformation, the container body 11 and the viscosity of the viscous fluid 13 flowing inside the lid body 12 are attenuated, and good vibration isolation characteristics can be exhibited. In particular, in the viscous fluid-filled damper 11 of the present embodiment, the stirring cylinder portion 5a of the flexible portion 5 does not protrude into the sealed container 2 as in the viscous fluid-filled damper 1 of the conventional example. The stirring cylinder portion 5a acts on vibration damping by agitating the viscous fluid 3 in response to vibration, but in this embodiment, a projecting element to the inside of the “sealed container” such as the stirring cylinder portion 5a is provided. By increasing the filling amount of the viscous fluid 13, excellent vibration isolation characteristics can be exhibited.

  Paying attention to the wall thickness of the peripheral wall portion 16, the groove inner side surface portion (groove bottom surface portion) of the mounting groove 16a is thin, and the lower and upper portions of the mounting groove 16a are formed thicker than that. Therefore, even if the lower part and the upper part support the weight of the mechanical chassis 18, the lower part and the upper part do not deform so as to be bent. Since the groove inner side surface portion (groove bottom surface portion) is thin while giving a certain degree of rigidity in this way, for example, when the mechanical chassis 18 is displaced in the horizontal direction in FIG. Therefore, the above-described good vibration isolation characteristics can be exhibited.

2nd Embodiment [FIG. 4] ; The viscous fluid enclosure damper 19 of this embodiment is a deformation | transformation form of the viscous fluid enclosure damper 10 of 1st Embodiment. The difference is that a guard ring 20 as a “hard portion” made of a hard material having a cylindrical shape and a relative shape to the outer periphery of the mounting groove 16a is fitted in the mounting groove 16a, and the remaining configuration is the first embodiment. Is the same as

  The guard ring 20 is formed in a cylindrical shape that can cover the inner surface (groove bottom surface) of the mounting groove 16a, and is a separate member from the soft portion 14 made of a rubber-like elastic body. In order to fit the guard ring 20 in the mounting groove 16a, after forming the container body 11, the soft portion 14 is deformed so as to be crushed, the guard ring 20 is inserted, and the guard ring 20 is fitted into the mounting groove 16a. The guard ring 20 can be made of the same material as the hard material described with reference to the hard portion 15 and the lid 13 of the container body 11 described above. Use hard and rigid material with excellent impact.

  Next, the operation and effect of this embodiment will be described. The mechanical chassis 18 is usually formed of a highly rigid hard material such as metal or hard resin, and the mounting piece 18a is the same. Therefore, when the engaging inner edge 18b of the mounting piece 18a made of such a hard material is in direct contact with the mounting groove 16a, the engaging inner edge of the mounting piece 18a that is displaced by the vibration or impact of the mechanical chassis 18 is used. If 18b rubs or collides strongly with the mounting groove 16a, there is a concern that the mounting groove 16a may be worn or broken. In this respect, in this embodiment, the guard ring 20 is fitted in the mounting groove 16a, and the engagement inner edge 18b of the mounting piece 18a is not in direct contact with the mounting groove 16a, thereby reducing wear of the mounting groove 16a. And durability can be improved.

3rd Embodiment [FIG. 5] ; The viscous fluid enclosure damper 21 of this embodiment is a deformation | transformation form of the viscous fluid enclosure damper 19 of 2nd Embodiment, and a difference is only the shape of the guard ring 22. FIG. The guard ring 22 is configured to cover not only the inner surface (groove bottom surface) of the mounting groove 16a but also the entire groove surface of the mounting groove 16a including the groove upper surface and the groove inner lower surface facing each other. It is. Therefore, according to this embodiment, since the mounting piece 18a does not directly contact all the groove surfaces of the mounting groove 16a, there is an advantage that wear of the mounting groove 16a can be suppressed and durability can be further improved.

Fourth Embodiment [FIG. 6] In the second and third embodiments, the guard rings 20 and 22 are fitted in the mounting grooves 16a, whereas the viscous fluid-filled damper 23 of the present embodiment has the guard rings. An annular hard wall 24 corresponding to 20 and 22 is integrally formed in the mounting groove 16a. Therefore, there is an advantage that the production efficiency can be increased because there is no fitting work. The annular hard wall 24 is formed so as to cover a continuous portion of the groove inner upper surface and the groove lower surface with respect to the groove inner side surface (groove bottom surface). That is, the upper surface in the groove and the lower surface in the groove do not cover all of them, but cover the corners of the mounting grooves 16a, so that durability at corners where wear resistance is particularly required. Can be improved.

5th Embodiment [FIG. 7] ; Although the annular rigid wall 24 of 4th Embodiment is the structure which coat | covers all the groove | channel inner side surfaces (groove bottom face), the viscous fluid enclosure damper 25 of this embodiment is an upper side annular shape. The hard wall 26 and the lower annular hard wall 27 are integrally formed in the mounting groove 16a, and the intermediate soft portion 16b made of a rubber-like elastic body forming the peripheral wall portion 16 is interposed in the gap therebetween. . Therefore, in addition to the advantage of good productivity as in the fourth embodiment, there are the following advantages in particular.

  That is, the viscous fluid-filled damper 25 elastically deforms the inner surface of the mounting groove 16a in the intermediate soft portion 16b without completely covering the mounting groove 16a unlike the annular hard wall 24 of the fourth embodiment. be able to. For this reason, the deflection of the mounting piece 18a that is displaced by vibration or impact can be suppressed by the elastic deformation of the intermediate soft portion 16b. As described above, if the intermediate soft portion 16b is exposed in the mounting groove 16a, the intermediate soft portion 16b may be worn and inferior in durability. However, the width of the intermediate soft portion 16b is the thickness of the mounting piece 18a ( This is not a problem because it is sufficiently smaller than the height of the inner surface of the mounting groove 16a.

Sixth Embodiment [FIGS. 8 and 9] ; In the first to fifth embodiments described above, the basic shape of the “sealed container” is a hollow column, but in the sixth and seventh embodiments, “sealed” The basic shape of the “container” is a hollow cylinder, that is, an inner peripheral wall, an outer peripheral wall, a closed wall that closes between the inner peripheral wall and the end of the outer peripheral wall, and a viscous fluid in an annular sealed space formed inside What encloses is described.

  First, the viscous fluid-filled damper 28 of the sixth embodiment has a configuration different from that of the above-described embodiments in both the container body 29 and the lid 30. The viscous fluid 13 is the same.

The “sealed container” composed of the container main body 29 and the lid body 30 is formed as a hollow cylindrical shape whose end is closed. The container main body 29 is formed with a hard outer peripheral wall 31 made of the same hard material as in the above-described embodiment. A mounting groove 31 a that engages with the mounting piece 18 a of the mechanical chassis 18 is formed in the hard outer peripheral wall 31. A cylindrical upper soft outer peripheral wall 32 and a lower soft outer peripheral wall 33 are fixedly formed on the upper and lower ends of the hard outer peripheral wall 31, respectively. The upper soft outer peripheral wall 32 is formed integrally and continuously with a cylindrical soft inner peripheral wall 35 via an annular top surface portion 34. The lower end of the soft inner peripheral wall 35 is fixed to an annular inner bottom plate 36 as a “bottom plate”, and the lower end of the lower soft outer peripheral wall 33 is fixed to an annular outer bottom plate 37. Both the inner bottom plate 36 and the outer bottom plate 37 are fixed to the lid body 30 by ultrasonic fusion. An insertion hole 36 a is formed at the center of the inner bottom plate 36, and an insertion hole 30 a that is aligned with the insertion hole 36 a is also formed in the lid 30 as a “bottom plate”.
In such a “sealed container” of this embodiment, the soft inner peripheral wall 35 and the inner bottom plate 36 constitute an “inner peripheral wall”, and the hard outer peripheral wall 31, the upper soft outer peripheral wall 32, the lower soft outer peripheral wall 33, and the outer bottom plate. 37 constitutes an “outer peripheral wall”, and the top surface portion 34 and the lid body 30 constitute a “closing wall”.
In addition, although the inner bottom plate 36 and the outer bottom plate 37 are separate members in this embodiment, they may be integrally formed by providing a rod-like connecting portion that connects them in the radial direction.

  As shown in FIG. 9, the viscous fluid-filled damper 28 configured as described above is inserted from the opening end side of the soft inner peripheral wall 35 and is inserted into the two insertion holes 36 c and 30 a, and the bottom surface 8 b of the housing 8 is formed. The viscous fluid-filled damper 28 is fixed by screwing with the screw hole 8c.

  In the viscous fluid-filled damper 28 of the present embodiment, the following actions and effects can be exhibited in addition to the actions and effects common to the above-described embodiment. That is, the mounting groove 31 a of the hard outer peripheral wall 31 engages with the engaging inner edge 18 b of the mounting piece 18 a, and supports the plate surface of the mounting piece 18 a by surface contact in the axial direction of the hard outer peripheral wall 31. For this reason, even if the coil spring 9 is not used as in the above-described embodiment, the mechanical chassis 18 can be reliably supported for vibration isolation. Moreover, since the attachment piece 18a rubs against or collides with the hard outer peripheral wall 31, excellent durability can be exhibited.

  Further, since the fixing point of the screw N for fixing the viscous fluid-filled damper 28 is not provided as the projection 12a unlike the lid body 12 of the above embodiment, there is no portion projecting outward from the lid body 30, and the viscous fluid The mounting space for the enclosed damper 28 is reduced, and the disk device can be reduced in size.

  The “sealed container” composed of the container body 29 and the lid body 30 has a hollow cylindrical shape, and the inside of the soft inner peripheral wall 35 is a cavity. For this reason, the container main body 29 that receives the vibration of the mechanical chassis 18 is relatively greatly elastically deformed as compared with the configuration in which the viscous fluid 13 is filled in the hollow columnar “sealed container” as in the first to fifth embodiments. As a result, the stirring property and fluidity of the viscous fluid 13 are enhanced. The viscous fluid-filled damper 28 of the present embodiment can exert a high vibration damping effect on the mechanical chassis 18 by such an action.

7th Embodiment [FIG. 10] ; In 6th Embodiment, it fixes to the hard outer peripheral wall 31 so that the lower end surface of the upper side soft outer peripheral wall 32 may be abutted, and the lower end side surface of the hard outer peripheral wall 31 is made into the lower soft outer peripheral wall. It is fixed so as to abut against the upper end side surface of 33. On the other hand, in the viscous fluid-filled damper 38 of the present embodiment, an annular hard outer peripheral wall 39 is fixed to a soft inner peripheral wall 40 made of a rubber-like elastic body by integral molding. According to this, in addition to the effect | action and effect of 6th Embodiment, there exists an advantage that the fixation strength of the hard outer peripheral wall 39 and the soft inner peripheral wall 40 can be raised.

Eighth Embodiment [FIGS. 11 and 12] ; The viscous fluid-filled damper 41 of this embodiment includes a container body 42 and a lid 43 as a “sealed container”. The container body 42 is formed with a hard outer peripheral wall 44 having an annular shape and a U-shaped cross section at a substantially central position in the cylinder axis direction. A mounting groove 44a is formed in the hard outer peripheral wall 44 over the entire periphery, and the engaging inner edge 18b of the mounting piece 18a of the mechanical chassis 18 is locked there.
An upper soft outer peripheral wall 45 made of a rubber-like elastic body is fixedly formed on the wide upper end surface of the hard outer peripheral wall 44. The upper soft outer peripheral wall 45 is connected to the soft inner peripheral wall 46 through the top surface portion 34. A hard inner peripheral portion 47 is formed at the lower end of the soft inner peripheral wall 46. An insertion hole 47a for a screw N is formed in the hard inner peripheral portion 47 along the cylinder axis direction. A concave portion 47b is formed at the lower end of the hard inner peripheral portion 47, and the head of the screw N is locked here.
On the other hand, a lower soft outer peripheral wall 48 made of a rubber-like elastic body having an annular shape and a bent cross section is fixedly formed on the wide lower end surface of the hard outer peripheral wall 44. An annular outer bottom plate 49 is formed at the lower end of the soft lower outer peripheral wall 48.
The lid body 43 is formed with a projection 43a having a hat-shaped cross section at the center, and a through hole 43b is formed in the projection 43a. Then, the outer edge portion of the lid body 43 is ultrasonically welded to the outer bottom plate 49, and the protruding portion 43 a is ultrasonically welded to the concave portion 47 b of the hard inner peripheral portion 47. Will be fixed.

  Next, the attachment structure of the viscous fluid-filled damper 41 will be described. In order to attach the viscous fluid-filled damper 41, as shown in FIG. 12, a screw N as an “attachment tool” is inserted into the insertion hole 47 a of the hard inner peripheral portion 47 from the lid body 43 side. The screw hole 8c in the bottom surface 8b is screwed. The screw N is threaded until the hard inner peripheral portion 47 comes into contact with the bottom surface 8b of the housing 8. Accordingly, the viscous fluid-filled damper 41 is attached such that the top surface portion 34 is crushed by the bottom surface 8 b of the housing 8. As a result, the soft inner peripheral wall 46, the top surface portion 34, and the upper soft outer peripheral wall 45 bulge outward in the cylinder axis direction, and a bellows-shaped bent portion 50 is formed.

According to the viscous fluid-filled damper 41 of the present embodiment as described above, the following actions and effects can be exhibited particularly.
The mounting groove 44 a (hard outer peripheral wall 44) that holds the mechanical chassis 18 is floated by the bellows-shaped bent portion 50 and the lower soft outer peripheral wall 48 between the housing 8 and the lid body 43, which are hard and rigid. Supported in state. For this reason, the displacement of the mechanical chassis 18 along the cylindrical axis direction of the container main body 42 due to vibration or impact can be suppressed between the housing 8 and the lid 43. Therefore, the mechanical chassis 18 is not greatly displaced in the housing 8 even when subjected to vibration or impact, and the disk device can be downsized as a whole.

  Further, a bellows-like bent portion 50 is provided on the upper side of the mounting groove 44a, and a lower soft outer peripheral wall 48 having a bent shape is provided on the lower side. Therefore, when subjected to vibration or impact in a direction (horizontal direction) intersecting the cylinder axis direction of the container main body 42, horizontal displacement deformation of the bellows-shaped bent portion 50 or the bent lower soft outer peripheral wall 48 is caused. The viscous resistance of the viscous fluid 13 filled therein can attenuate the vibration and absorb the impact. Therefore, in combination with the above-described cylinder axis direction, it is possible to exhibit a high damping effect with respect to vibrations and shocks in any direction.

Modifications of Embodiments [FIG. 13] ; Various modifications can be made to the embodiments described above. One example will be described.

  The corner where the peripheral wall 16 and the top surface 17 of the first to fifth embodiments are continuous, the corner where the upper soft peripheral wall 32 and the top surface 34 of the sixth embodiment are continuous, the soft outer periphery of the seventh embodiment About the corner | angular part where the wall 39 and the top | upper surface part 34 continue, it can each comprise as a curved shape. According to this, when the vibration or shock of the mechanical chassis 18 is attenuated, the curved shape is more flexible than the corner portion because there is no shape holding force due to the rigidity of the “corner”. Therefore, stress concentration is relaxed and the amount of deformation can be reduced. Therefore, durability can be improved.

  In 1st-5th embodiment, it divided into the soft part 14 which consists of rubber-like elastic bodies, and the hard part 15 which consists of hard materials, that is, it formed with a different material, However, The part equivalent to the hard part 15 is also with the soft part 14. It may be formed of the same material and have different hardness.

  The hard peripheral wall portion 31 of the sixth embodiment may be formed as divided in the circumferential direction as shown in FIG. 13, for example. Similarly, the guard rings 20 and 22 of the second and third embodiments, the annular rigid wall 24 of the fourth embodiment, the upper annular rigid wall 26 and the lower annular rigid wall 27 of the fifth embodiment, and the seventh embodiment. The configuration of the hard peripheral wall portion 38 may also be divided in the circumferential direction. In addition, when setting it as a division | segmentation structure, it is good also as a structure which has a connection part instead of dividing | segmenting completely.

Sectional drawing of the viscous fluid enclosure damper by 1st Embodiment. FIG. 2 is an explanatory view of attachment of the viscous fluid-filled damper of FIG. Sectional drawing of the disc apparatus which shows typically the use condition of the viscous fluid enclosure damper of FIG. Sectional drawing of the viscous fluid enclosure damper by 2nd Embodiment. Sectional drawing of the viscous fluid enclosure damper by 3rd Embodiment. Sectional drawing of the viscous fluid enclosure damper by 4th Embodiment. Sectional drawing of the viscous fluid enclosure damper by 5th Embodiment. Sectional drawing of the viscous fluid enclosure damper by 6th Embodiment. Sectional drawing which shows the attachment state of the viscous fluid enclosure damper of FIG. Sectional drawing of the viscous fluid enclosure damper by 7th Embodiment. Sectional drawing of the viscous fluid enclosure damper by 8th Embodiment. Sectional drawing which shows the attachment state of the viscous fluid enclosure damper of FIG. The external appearance perspective view which shows the modification of the hard surrounding wall part (31) of 6th Embodiment. Sectional drawing of the disc apparatus which shows typically the use condition of the viscous fluid enclosure damper by a prior art example.

Explanation of symbols

10. Damper filled with viscous fluid (first embodiment)
11 Container body (sealed container)
12 Lid (sealed container)
12a Protrusion 13 Viscous fluid 14 Soft portion 15 Hard portion 16 Peripheral wall portion 16a Mounting groove 16b Intermediate soft portion 17 Top surface portion 18 Mechanical chassis 18a Mounting piece 18b Inner edge for engagement 19 Viscous fluid-filled damper (second embodiment)
20 Guard ring (hard part)
21 Damper filled with viscous fluid (Third embodiment)
22 Guard ring (hard part)
23 Damper filled with viscous fluid (fourth embodiment)
24 annular hard wall (hard part)
25 Damper filled with viscous fluid (fifth embodiment)
26 Upper annular hard wall (upper hard part)
27 Lower annular rigid wall (lower rigid part)
28 Damper filled with viscous fluid (Sixth embodiment)
29 Container body 30 Lid (bottom plate)
30a Insertion hole 31 Hard outer peripheral wall 31a Mounting groove 32 Upper soft outer peripheral wall 33 Lower soft outer peripheral wall 34 Top surface part 35 Soft inner peripheral wall 36 Inner bottom plate (bottom plate)
36a Insertion hole 37 Outer bottom plate 38 Damper containing viscous fluid (seventh embodiment)
39 Hard Outer Wall 40 Soft Inner Wall 41 Viscous Fluid Enclosed Damper (Eighth Embodiment)
42 Container body 43 Lid 43a Projection 43b Through hole 44 Hard outer peripheral wall 44a Mounting groove 45 Upper soft outer peripheral wall 46 Soft inner peripheral wall 47 Hard inner peripheral part 47a Insertion hole 47b Recessed part 48 Lower soft outer peripheral wall 49 Outer bottom plate 50 Bellows shape Deformation part

Claims (9)

It has a hollow sealed container and a viscous fluid filled in the sealed container, has a playback mechanism for a disk-shaped recording medium, and is formed with a thin plate-like attachment piece that penetrates and forms an end-ring-like inner edge for engagement. A viscous fluid-filled damper that supports the mechanical chassis
The airtight container is provided with a peripheral wall portion made of a rubber-like elastic body, and the peripheral wall portion is engaged with an engaging inner edge of the mounting piece, and a mounting groove for supporting the plate surface of the mounting piece by surface contact is formed. Fluid filled damper.   The viscous fluid-filled damper according to claim 1, wherein a hard portion is provided on an inner surface of the mounting groove facing an inner edge for engagement of the mounting piece.   3. The viscous fluid-filled damper according to claim 2, wherein the hard part on the inner surface of the groove is divided into an upper hard part and a lower hard part, and an intermediate soft part made of a rubber-like elastic body is provided between the upper part and the lower part.   The viscous fluid-filled damper according to any one of claims 1 to 3, wherein a hard portion is provided on at least one of the upper surface in the groove and the lower surface in the groove of the mounting groove facing the plate surface of the mounting piece.   The viscous fluid-filled damper according to any one of claims 2 to 4, wherein the hard portion is an integrally formed body formed by molding with a rubber-like elastic body forming a peripheral wall portion.   The viscous fluid-filled damper according to any one of claims 2 to 4, wherein the hard portion is formed in a ring shape and is fitted into the mounting groove. It has a hollow sealed container and a viscous fluid filled in the sealed container, has a playback mechanism for a disk-shaped recording medium, and is formed with a thin plate-like attachment piece that penetrates and forms an end-ring-like inner edge for engagement. A viscous fluid-filled damper that supports the mechanical chassis
The sealed container is provided with a soft inner peripheral wall made of a rubber-like elastic body and a hard outer peripheral wall made of a hard material that is fixed to the outer peripheral surface of the soft inner peripheral wall, and the hard outer peripheral wall is engaged with an inner edge for engagement of the mounting piece. And a viscous fluid-filled damper having a mounting groove for supporting the plate surface of the mounting piece by surface contact.   The viscous fluid-filled damper according to any one of claims 1 to 7, wherein the sealed container is formed as a hollow columnar shape whose end is closed.   An airtight container is formed in a hollow cylindrical shape whose end is closed, and an insertion hole for a fixture for fixing the airtight container to a housing accommodating the mechanical chassis is formed on one end side of the inner peripheral portion of the hollow cylindrical shape. The viscous fluid-filled damper according to any one of claims 1 to 7, wherein a bottom plate is provided.

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