JP2013204610A - Damper - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a damper including a flexible film formed of a rubber-like elastic body, a tubular surrounding wall made of hard resin, and a cover body which closes one end of the surrounding wall and fixes another end either to a support body or a supported body, having a fixing structure which fixes an end portion of the flexible film in press-contact between the surrounding wall and the cover body, and disposed between the support body and the supported body to damp vibration of the supported body, while reducing noise.SOLUTION: A flexible film 15 includes: a bellows part 15b formed from a mounting recess 15a to a surrounding wall 14; an extension part 15c which extends from the bellows part 15b to a cover body 16 along the surrounding wall 14, and moves in contact with/away from the surrounding wall 14 when vibrated; and a protrusion 15d which protrudes from the extension part 15c in a flange shape, and is brought into pressure contact between the surrounding wall 14 and the cover body 16. On surfaces of the surrounding wall 14 and the extension part 15c in contact therewith, an uneven crimp surface is formed.

Description

  The present invention relates to an anti-vibration technique used for audio equipment including in-vehicle use and consumer use, video equipment, information equipment, various precision equipment, home appliances such as a refrigerator, and the like. The present invention relates to a damper that dampens vibrations.

  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. Therefore, it is vulnerable to external vibration transmitted from the outside of the device and internal vibration caused by rotation of the eccentric disk, and it is necessary to prevent malfunction caused by such vibration. Therefore, it is customary to dampen the vibration of the mechanical chassis by interposing a damper between the mechanical chassis on which the disk table or the like is mounted and the housing as a support.

  An example of such a damper is a viscous fluid-filled damper 101 shown in FIG. 4, for example, in which a viscous fluid 102 such as silicone oil is sealed in a sealed container 103, and the sealed container 103 is made of a hard resin. A cylindrical peripheral wall 104, a flexible membrane 105 made of a rubber-like elastic body having a mounting recess 105a that seals one end of the peripheral wall 104 and connects to the support 107, and the other end of the peripheral wall 104 is sealed At the same time, the lid 106 is made of a hard resin that is fixed to the supported body 108 with screws N. Here, the peripheral wall 104 and the flexible film 105 are generally fixed by heat fusion by two-color molding, and the peripheral wall 104 and the lid body 106 are generally fixed by ultrasonic fusion.

  The rubber-like elastic body that forms the flexible film 105 of the viscous fluid-filled damper 101 is required to be a material that can be heat-sealed with the hard resin that forms the peripheral wall 104. There is a disadvantage that the type of the elastic body is limited. Therefore, a configuration in which a rubber-like elastic body forming the flexible film 205 is pressure-bonded between the peripheral wall 204 and the lid body 206 as in the viscous fluid-filled damper 201 shown in FIG. 5 is used. By adopting such a configuration, it is not necessary to heat-bond the flexible film 205 and the peripheral wall 204, and the variation of the rubber-like elastic material that can be used for the flexible film 105 can be increased. A damper such as the viscous fluid-filled damper 201 is described in, for example, Japanese Patent Application Laid-Open No. 2008-95951 (Patent Document 1).

JP 2008-95951 A

However, the viscous fluid-filled damper 201 sometimes has a problem that a sound called rattle is generated in the actual use state.
Accordingly, the present invention has been made for the purpose of preventing or mitigating the occurrence of this sound.

The present inventors investigated the cause of this sounding, and as a result, when the damper is vibrated, a phenomenon occurs in which the flexible film 205 located on the inside of the peripheral wall 204 is separated or stuck. It has been found that has occurred. Therefore, the invention described below was created by paying attention to the configuration of this damper.
In other words, the present invention provides a flexible membrane made of a rubber-like elastic body that has a mounting recess fixed to one of a support or a supported body at one end and fluctuates under vibration, and a cylindrical peripheral wall made of a hard resin. And a lid that closes one end of the peripheral wall and adheres to either the support or the supported body, and presses the end of the flexible membrane between the peripheral wall and the lid A damper that has a fixing structure to be fixed and is disposed between the support and the support to attenuate the vibration of the support. The bellows part from which the flexible film extends from the mounting recess to the peripheral wall, and the bellows part to the peripheral wall. And extending to the lid along with an extension that contacts and separates from the peripheral wall when subjected to vibration, and a protrusion that protrudes like a bowl from the extension and presses between the peripheral wall and the lid, A textured surface having irregularities is formed on the contact surface between the peripheral wall and the extension part in contact with the peripheral wall. To provide that the damper.

  In addition, a flexible film made of a rubber-like elastic body that has an attachment recess fixed to one of the support and the supported body at one end and fluctuates under vibration, a cylindrical peripheral wall made of a hard resin, A lid that closes one end of the peripheral wall and adheres to either the support body or the supported body, and fixes the end of the flexible film by pressing between the peripheral wall and the lid body A damper that has a structure and is arranged between a support and a support to dampen vibration of the supported body, a flexible film having a bellows part extending from the mounting recess to the peripheral wall, and a lid extending from the bellows part along the peripheral wall An extension that extends to the body and that contacts and separates from the peripheral wall when subjected to vibration, and a protrusion that protrudes in a hook shape from the extension and press-contacts between the peripheral wall and the lid, A damper characterized in that a textured surface having irregularities is formed on a contact surface on the peripheral wall side in contact with the peripheral wall. Subjected to.

  Alternatively, a flexible film made of a rubber-like elastic body that has an attachment recess to be fixed to one of the support or the supported body at one end and fluctuates under vibration, and a cylindrical peripheral wall made of hard resin, A lid that closes one end of the peripheral wall and adheres to either the support or the supported body, and presses and fixes the end of the flexible membrane between the peripheral wall and the lid A damper having a fixed structure and arranged between the support and the support to attenuate the vibration of the support. The bellows part from which the flexible film extends from the mounting recess to the peripheral wall, and from the bellows part to the peripheral wall. The extension includes an extension that extends to the lid and contacts and separates from the peripheral wall when receiving vibration, and a protrusion that protrudes in a hook shape from the extension and press-contacts between the peripheral wall and the lid. A textured surface having irregularities is formed on the contact surface on the extension side where the wall and the peripheral wall are in contact with each other To provide the bumpers.

A flexible film made of a rubber-like elastic body that has a mounting recess fixed to one of the support and the supported body at one end and fluctuates under vibration, a cylindrical peripheral wall made of hard resin, A lid that closes one end and adheres to either the support or the supported body, and is attached to the support and the supported body from either the support or the supported body. The vibration transmitted to the other can be attenuated.
And since it has the fixing structure which presses and fixes the edge part of a flexible film between a surrounding wall and a cover body, a flexible film is fixed to a surrounding wall, without performing heat fusion with a flexible film and a surrounding wall. be able to. Therefore, it is possible to use a material other than the material in which the flexible membrane and the peripheral wall are heat-sealed with each other, the range of material selection is widened, and the variation of the combination of the flexible membrane and the peripheral wall material can be enhanced.

Since the flexible membrane has a mounting recess that is fixed to either the support or the supported body, the viscous fluid can be agitated in the mounting recess by using a viscous fluid-filled damper in which the viscous fluid is sealed inside the damper. It can be responsible for vibration damping and shock buffering.
Moreover, since the flexible film has a bellows part extending from the mounting recess to the peripheral wall, the bellows part is deformed by receiving vibration. As a result, in the case of an air damper, air can enter and exit between the inside and outside of the damper, and in the case of a viscous fluid-filled damper, the viscous fluid can be flowed to attenuate vibrations and mitigate impact. In addition, the shape of a bellows part is not limited to a bellows shape, and can be made into arbitrary shapes.

Furthermore, the flexible portion has an extension portion that extends from the bellows portion to the lid body along the peripheral wall and that contacts and separates from the peripheral wall when subjected to vibration. Since such an extension is provided, a fixing structure in which the flexible film is sandwiched between the peripheral wall and the lid can be employed. In addition, when receiving vibration, the contact with and away from the peripheral wall allows movement without being constrained by the peripheral wall, and the fluctuation range of the flexible film can be increased.
Furthermore, since the flexible part has a protrusion protruding in a hook shape from the extension part and press-contacted between the peripheral wall and the lid, the protrusion can be sandwiched between the peripheral wall and the cover. Therefore, the flexible portion can be fixed without being fused to the peripheral wall or the lid or fixed with an adhesive.

  In order to effectively suppress the generation of sound, it is important to suppress the adhesion between the peripheral wall and the flexible film. If the peripheral wall and the flexible membrane come into close contact with each other, it is presumed that a vacuum state is instantaneously formed when they are separated from each other, and a sound is produced when air enters the gap. Therefore, even when the peripheral wall and the flexible membrane are in contact with each other, by forming a textured surface and interposing air in the gap, it is possible to suppress the formation of the vacuum state, and to make it difficult to generate noise Seem.

Therefore, a textured surface having irregularities can be formed on the contact surfaces of the peripheral wall and the extension portion in contact with the peripheral wall. By forming a textured surface with irregularities on the contact surfaces of the peripheral wall and the extension that contacts this peripheral wall, even if the peripheral wall and the extension of the flexible membrane stick or leave, the generation of noise is suppressed. Can do.
Moreover, the embossed surface which has an unevenness | corrugation can be formed in the contact surface of the surrounding wall side where an extension part and a surrounding wall contact | connect. Even if a textured surface having irregularities is formed on the contact surface on the peripheral wall side where the extension portion and the peripheral wall are in contact with each other, the generation of noise can be suppressed.
Furthermore, a textured surface having irregularities can be formed on the contact surface on the extension portion side where the extension portion and the peripheral wall are in contact with each other. Even if a textured surface having irregularities is formed on the contact surface on the extension portion side where the extension portion and the peripheral wall are in contact with each other, generation of noise can be suppressed.

  And when the embossed surface is formed on both the peripheral wall and the flexible membrane, the surface roughness of the embossed surface provided on the peripheral wall can be made rougher than the surface roughness of the embossed surface provided on the flexible membrane. This is because sound can be reliably prevented without depending on the material of the flexible membrane. More specifically, the peripheral wall is formed of a hard resin, and the flexible film is formed of a rubber-like elastic body. Here, considering the case where wrinkles are formed on the flexible membrane, depending on the hardness of the rubber-like elastic body, the wrinkles on the surface of the flexible membrane may be deformed by the load closely contacting the peripheral wall, as if there are no wrinkles There is a risk of being in close contact with the peripheral wall in the state. Further, even when the flexible membrane has a strong tackiness, there is a risk that the air may be expelled and adhered by being in close contact with the peripheral wall for a long time. Thus, the texture provided on the flexible film may be affected by the hardness and tackiness of the material of the flexible film. On the other hand, since the peripheral wall is formed of a hard resin, even if it is in close contact with the flexible film, there is no risk of deformation due to the load, and air can be reliably interposed between the peripheral wall and the flexible film. In other words, when a textured surface is formed on both the peripheral wall and the flexible film, the surface roughness of the textured surface provided on the peripheral wall is formed to be rougher than the surface roughness of the textured surface provided on the flexible film. Air can be reliably interposed between the film and the sound generation can be reliably suppressed.

Such a damper can be a viscous fluid-filled damper having a viscous fluid in an internal space formed by a flexible membrane, a peripheral wall, and a lid. If the damper is filled with a viscous fluid, vibration damping and impact mitigation performance can be enhanced by stirring the viscous fluid sealed in the internal space.
Moreover, it can also be set as the air damper which provided the air inlet / outlet hole in the flexible membrane, the surrounding wall, etc. as the inside space. As an air damper, vibrations can be attenuated and shocks can be reduced by entering and leaving air inside and outside the interior space.

According to the damper of the present invention, it is possible to suppress the generation of sound during actual use.
In addition, according to the damper of the present invention, the range of selection of a rubber-like elastic body that can be used as a flexible membrane is widened, and a damper that can respond to changes in required characteristics according to the type and size of vibration and impact is provided. Can be obtained.

It is a schematic cross section of a damper according to an embodiment. It is a schematic cross section which shows the state by which the attachment recessed part of the damper of FIG. 1 was pushed in. It is a schematic cross section which shows the state by which the attachment recessed part of the damper of FIG. 1 was pulled. It is a schematic cross section of the damper by one prior art example. It is a schematic cross section of a damper according to another conventional example.

  The present invention will be described based on an embodiment thereof with reference to the drawings. In addition, duplication description is abbreviate | omitted about the structure, material, manufacturing method, effect, etc. which are common in each embodiment.

First Embodiment (FIGS. 1 to 3) :
As shown in FIG. 1, the damper according to the present embodiment encloses the viscous fluid 12 in a sealed container 13 composed of a peripheral wall 14 made of hard resin, a lid 16 and a flexible film 15 made of a rubber-like elastic body. This is a viscous fluid-filled damper 11. In a planar shape (not shown), the outer diameters of the peripheral wall 14 and the flexible film 15 appear circular. Accordingly, FIG. 1 shows any longitudinal cross-sectional shape passing through the center of the viscous fluid-filled damper 11. The viscous fluid-filled damper 11 is subjected to a textured process on a predetermined contact surface where the peripheral wall 14 is in contact with the flexible film 15, and is also subjected to a textured process on a predetermined contact surface where the flexible film 15 is in contact with the peripheral wall 14. It is characterized by.
In the following description, when referring to the upper and lower sides of the damper, the upper side of the drawing is referred to as the upper side of the damper.

  The flexible membrane 15 made of a rubber-like elastic body that changes due to vibration is formed in a generally bowl shape that is hollow and open at one end, and either the support or the support is fixed to one end (center) that is closed. And a bellows portion 15b extending from the mounting recess 15a to the peripheral wall 14, extending to the cover body 16 while contacting the peripheral wall 14 from the bellows portion 15b, and extending away from the peripheral wall 14 when receiving vibration. 15c, and a protrusion 15d that protrudes in a hook shape from the extension 15c and is held in pressure contact between the peripheral wall 14 and the lid body 16.

  The peripheral wall 14 made of hard resin has a pressing portion 14a that spreads outward at one end of the cylindrical shape so as to cover the protrusion 15d. An inner edge at the lower end of the pressing portion 14 a is a locking surface 14 b that engages with the protrusion 15 d, and an outer edge at the lower end of the pressing portion 14 a is a fixing surface 14 c that is fixed to the lid body 16. The depth from the fixing surface 14c to the locking surface 14b of the peripheral wall 14 is slightly thinner than the thickness of the protrusion 15d. Therefore, the protrusion 15d is sealed between the peripheral wall 14 and the lid body 16, so that the protrusion 15d can be sandwiched between the peripheral wall 14 and the lid body 16 in a compressed state.

  The lid 16 is also formed of a hard resin like the peripheral wall 14. A portion of the lid body 16 facing the fixing surface 14c of the peripheral wall 14 becomes a fixing surface 16a of the lid body 16, and both the fixing surfaces 14c and 16a are fixed to each other by ultrasonic fusion or the like, so that the flexible film 14 The protrusion 14a which becomes an opening end is closed.

  The inner peripheral surface 14d of the peripheral wall 14 is in contact with the extension 15c of the flexible film 15 but is not bonded. Therefore, when the vibration is received, the flexible film 15 is deformed so that the extension 15c is separated from the peripheral wall 14. There is. That is, in the state shown in FIG. 2 in which the mounting recess 15a is pushed downward when the viscous fluid-filled damper 11 is attached to a support body and a support body (not shown) and subjected to vibration under actual use conditions. The peripheral wall 14 and the extension portion 15c are kept in contact with each other. However, in the state shown in FIG. 3 in which the mounting recess 15a is pulled upward, the extension portion 15c is separated from the peripheral wall 14, and the There may be a space S between them.

On both contact surfaces of the peripheral wall 14 and the extension portion 15c of the flexible film 15 that is in contact with the peripheral wall 14, a textured surface having an uneven surface is formed. More precisely, of the mutual contact surfaces of the peripheral wall 14 and the extended portion 15c, at least a portion where the peripheral wall 14 and the extended portion 15c are separated from or in contact with the movement of the damper 11 is defined as a textured surface.
The textured surface is formed from a die that has been subjected to a blasting process with a grain size of about # 10 to # 240 for the contact surface with the extension 15c on the peripheral wall 14 side (hereinafter also referred to as “peripheral wall contact surface”). It is more preferable to form from a mold that has been subjected to a blast treatment with a particle size of about # 20 to # 120.
Further, the contact surface with the peripheral wall 14 on the extension portion 15c side (hereinafter also referred to as “extension portion contact surface”) is preferably formed from a mold subjected to blasting with a particle size of about # 10 to # 240, More preferably, it is formed from a mold that has been subjected to a blasting treatment with a particle size of about # 20 to # 120.
If the roughness of the textured surface is too fine, the effect of suppressing sound is thin, and if it is too rough, a close contact portion is locally generated and the effect of suppressing sound is reduced. On the other hand, if it is too rough, dust tends to accumulate during molding.

Further, the surface roughness of the embossed surface formed on the peripheral wall 14 and the surface roughness of the embossed surface formed on the extension portion 15c of the flexible film 15 can be appropriately set, and are preferably within the above-mentioned range. It is more preferable to form the textured surface of the peripheral wall contact surface rougher than the extension portion contact surface.
If a textured surface is provided on both the peripheral wall 14 and the extension 15c, an air layer can be provided more reliably than when a textured surface is provided on either one of them, and noise can be prevented. Moreover, the size of the embossing can be made finer than the case where the embossing surface is provided on either one.
In addition, since the size of the embossed surface on the peripheral wall 14 side and the extension portion 15c side can be made different from each other, the optimum size is set according to the combination of the materials of the peripheral wall 14 and the extension portion 15c. Can do. Furthermore, if the textured surface of the peripheral wall 14 is made rougher than the extension 15c, air can be reliably trapped between the textured surfaces without being affected by the material of the flexible film.

  The rubber-like elastic body forming the flexible film 15 is a material that exhibits a damping effect, and includes synthetic rubbers such as butyl rubber, styrene butadiene rubber, chloroprene rubber, nitrile rubber, urethane rubber, silicone rubber, fluorine rubber, and acrylic rubber. In addition, thermoplastic elastomers such as natural rubber, styrene thermoplastic elastomer, olefin thermoplastic elastomer, urethane thermoplastic elastomer, and vinyl chloride thermoplastic elastomer can be suitably used.

  The hard resin forming the peripheral wall 14 and the lid body 16 is a thermoplastic resin or thermosetting excellent in required performance such as mechanical strength, heat resistance, durability, dimensional accuracy, reliability, and light weight and processability. Is preferred. These hard resins include, for example, polypropylene resin, polyethylene resin, polyvinyl chloride resin, polystyrene resin, acrylonitrile / styrene / acrylate resin, acrylonitrile / butadiene / styrene resin, polyamide resin, polyacetal resin, polycarbonate resin, polyethylene terephthalate resin, poly Examples thereof include thermoplastic resins such as butylene terephthalate resin, polyphenylene oxide resin, polyphenylene ether resin, polyphenylene sulfide resin, polyurethane resin, and liquid crystal polymer, and composite resins thereof. Moreover, thermosetting resins, such as an epoxy resin and a urethane resin, can be mentioned.

  As the viscous fluid 12, a liquid added with solid particles that do not react or dissolve in the liquid can be used in addition to the liquid alone. For example, liquids such as silicone oils, paraffinic oils, ester oils, and liquid rubbers, or those added with solid particles that do not react or dissolve in these liquids can be used. Of these, silicone oils are preferred as liquids due to required performance such as temperature dependency, heat resistance, and reliability. Specifically, dimethyl silicone oil, methylphenyl silicone oil, methyl hydrogen silicone oil, fluorine-modified silicone oil are preferred. The solid particles that do not react or dissolve in these silicone oils include silicone resin powder, polymethylsilsesquioxane powder, wet silica, dry silica, glass beads, glass balloons, etc., or their surfaces Processed goods etc. can be used and these can be used individually or in combination of two or more.

  A method for manufacturing the viscous fluid-filled damper 11 will be described. The flexible film 15 and the peripheral wall 14 are separately formed from a mold having a textured surface. Then, the flexible film 15 penetrates into the hole of the peripheral wall 14. Next, the viscous fluid 12 is injected into the flexible membrane 15. Finally, the lid body 16 is placed on the fixing surface 14c of the peripheral wall 14, and the fixing surface 14c of the peripheral wall 14 and the fixing surface 16a of the lid body 16 are fixed by ultrasonic fusion while the protrusion 15d is compressed and sandwiched. In this way, the viscous fluid-filled damper 11 is obtained.

In the viscous fluid-filled damper 11, it is possible to suppress the generation of sound generated when the extension portion 15 c of the flexible film 15 and the peripheral wall 14 are separated from each other or stuck together.
Further, according to the viscous fluid-filled damper 11, the projecting portion 15d is compressed and sandwiched between the peripheral wall 14 and the lid body 16, so that the flexible film 15 and the peripheral wall 14 are fused by the conventional technique. Even if the fixing is not performed, the protrusion 15 d serving as the opening end of the flexible film 15 can be sealed with the lid 16. Therefore, butyl rubber can be used as the material of the flexible film 15, and polypropylene resin can be used as the material of the peripheral wall 14 and the lid body 16. Therefore, the flexibility of material selection for the flexible membrane 15, the peripheral wall 14, and the lid body 16 can be expanded. Therefore, it is possible to realize an appropriate viscous fluid-filled damper 11 corresponding to required performance such as attenuation, durability, and gas permeation resistance.

Second embodiment :
The viscous fluid-filled damper 21 of this embodiment is the same as the appearance shape of the viscous fluid-filled damper 11 described in the previous embodiment, and can be shown in FIGS.
The viscous fluid-filled damper 21 is the same as the viscous fluid-filled damper 11 in that the embossed surface is provided in the extension portion 15c of the flexible film 15, but the viscous fluid-filled damper 11 is not provided in the peripheral wall 14. Is different.

That is, in the viscous fluid-filled damper 21 of the present embodiment, the flexible film 15 is separated from or in contact with the peripheral wall 14 with the movement of the damper 21 in at least the portion where the extension 15c of the flexible film 15 is in contact with the peripheral wall 14. It is applied to the contact surface of the extension of the part to be performed.
The roughness of the textured surface is preferably formed from a mold that has been subjected to blasting with a grain size of preferably # 10 to # 120, more preferably # 10 to # 90. If the embossed surface formed on the rubber-like elastic body is fine, there is a risk of deformation over time. Therefore, if the embossed surface is provided on both the flexible film 15 and the peripheral wall 14, the effect will be greater if deformed. is there.
The viscous fluid-filled damper 21 of the present embodiment can also suppress noise.

Third embodiment :
The viscous fluid-filled damper 31 of this embodiment is similar to the appearance of the viscous fluid-filled dampers 11 and 21 described in the previous embodiment, and can be shown in FIGS.
The viscous fluid-filled damper 31 is the same as the viscous fluid-filled damper 11 in that a textured surface is provided on the peripheral wall 14, but the viscous fluid-filled damper 11 is not provided with a textured surface on the extension 15 c of the flexible film 15. Is different.

That is, in the viscous fluid-filled damper 31 according to this embodiment, at least the portion of the peripheral wall 15 in contact with the extension portion 15c of the flexible membrane 15 is moved away from or in contact with the peripheral wall 14 as the damper 31 moves. It is given to the peripheral wall contact surface of the part to do.
The roughness of the textured surface is preferably formed from a mold that has been subjected to blasting with a grain size of preferably # 10 to # 240, more preferably # 20 to # 120. The case where the textured surface is not formed on the flexible film 15 is the same as the case where the textured surface is provided on both the flexible film 15 and the peripheral wall 14.
Since the embossed surface is provided on the peripheral wall 14, the embossed surface is formed of a hard resin, so that it is difficult to collapse over time and is stable. In this respect, depending on the material, the textured surface is more preferable than the case where the textured surface is provided on the flexible portion 15 that is susceptible to friction.
The viscous fluid-filled damper 31 of the present embodiment can also suppress noise.

  In addition, when the relationship between the particle size (numerical value of #) when the blasting process is performed on the mold described in each embodiment and the surface roughness of the rubber-like elastic body generated from the mold is obtained, The results of Table 1 were obtained.

  That is, in the range of # 10 to # 240, the arithmetic average roughness is 16.9 μm to 0.4 μm, the maximum height roughness is 97.3 μm to 4.6 μm, and the ten-point average roughness is 71.1 to 3.11. It was 6 μm. Also, in the range of # 20 to # 120, the arithmetic average roughness is 7.5 μm to 0.9 μm, the maximum height roughness is 50.1 μm to 9.0 μm, and the ten-point average roughness is 37.2-6. It was 9 μm.

  A lubricant can be applied to the textured surface. By applying the lubricant, the adhesion between the peripheral wall 14 and the flexible film 15 is further suppressed, and the generation of noise can be further suppressed. Further, since the lubricant can be held in the concave portion of the embossed surface, the lubricant can be made difficult to scatter. Therefore, it is difficult to contaminate the support and the support, and the effect can be maintained for a long time. As such a lubricant, silicone oil or fluorine-based oil can be used.

  The said embodiment is an example of this invention, is not limited to such a form, The arbitrary change form which is not contrary to the meaning of this invention is included. For example, the dampers are viscous fluid-sealed dampers 11, 21, and 31 in which the viscous fluid 12 is sealed. However, the damper may be an air damper in which an air inlet / outlet hole is provided in the flexible film without using the viscous fluid 12. Further, the flexible membrane and other components can be appropriately changed. For example, there may be a change in the shape of the mounting recess or the bellows.

  Hereinafter, experimental examples will be described. As the material of the damper used in the experimental example, a thermoplastic styrene elastomer having a hardness of 20 (JIS K6253 type A) was used for the flexible film, and a polypropylene resin was used for the peripheral wall and the lid. Silicone grease was used as the viscous fluid. And the damper of the following sample 1-sample 9 whose external shape is the same as FIG. 1 was manufactured.

[Sample 1] :
It is an unprocessed damper that is not subjected to graining and does not perform any treatment on the boundary between the peripheral wall and the flexible membrane.
[Sample 2] :
In the same manner as the damper of the aspect shown in the second embodiment, the embossed surface was formed with a mold that was subjected to embossing of # 120 on the extended portion of the outer peripheral surface of the flexible film that was in contact with and separated from the peripheral wall.
[Sample 3] :
Silicone oil (lubricating oil) was applied to the portion where the flexible film of the damper of sample 1 was in contact with the peripheral wall.

[Sample 4] :
A copy sheet having a thickness of about 89 μm was interposed at the portion where the flexible film of the damper of Sample 1 was in contact with the peripheral wall.
[Sample 5] :
A fluorine-based lubricant was applied to the surface of the peripheral wall facing the flexible film of the damper of Sample 1.
[Sample 6] :
In the same manner as the damper of the aspect shown in the third embodiment, a textured surface was formed by a mold having a textured finish of # 120 on the portion of the inner circumferential surface of the peripheral wall where the extension portion of the flexible film is in contact with or separated from.

[Sample 7]
The same silicone oil as sample 3 was applied to the textured surface of the damper of sample 2 provided with a textured surface on the outer peripheral surface of the flexible membrane.
[Sample 8] :
In the same manner as in Sample 5, a fluorine-based lubricant was applied to the surface of the peripheral wall on the damper of Sample 2 provided with a textured surface on the outer peripheral surface of the flexible membrane.
[Sample 9]
In the same manner as the damper of the embodiment shown in the first embodiment, an embossed surface is formed with a die that has been subjected to # 60 embossing on an extension portion of the outer peripheral surface of the flexible membrane that is in contact with and away from the peripheral wall. An embossed surface was formed with a die that was subjected to an embossing process of # 30 at a portion of the inner peripheral surface where the extension portion of the flexible film contacted and separated.

A noise test (sound suppression performance test) of the dampers of Sample 1 to Sample 9 was performed. The specific test method is as follows.
A supported body with a mass of 300 g, which is assumed to be a mechanical chassis of a disk-shaped recording medium, is supported by four coil springs inside the housing (support), and the four mounting shafts face downward on the supported body. The mounting shafts were respectively inserted and held in the stirring cylinders of the viscous fluid-filled dampers. The viscous fluid-filled damper was fixed to the bottom plate of the casing serving as a support, and the bottom plate of the casing was fixed on the vibration table. The casing fixed to the vibration table was vibrated while increasing the acceleration by 0.1 G in the vertical direction at a frequency of 15 Hz, and the acceleration (G) immediately before the acceleration at which the sound was heard was used as the measurement value. For example, for sample 1, since a sound was heard when a vibration of 0.6 G was applied, the measured value was 0.5 G, which was a vibration that was not heard of the previous sound. The results are shown in Table 2 below.

From Table 2, the results were 0.6 to 1.0 for the dampers of Sample 2 to Sample 6 in which some measures were taken at the portion where the flexible membrane and the peripheral wall were in contact. Compared with the result of the damper of the sample 1 without any countermeasure being 0.5, the dampers of the sample 2 to the sample 6 showed an effect of suppressing noise.
Further, as can be seen from the results of Sample 7 to Sample 9, when the two measures were combined, the result was 1.0, indicating that the maximum effect was achieved.
In addition, comparing the textured sample 2, sample 6, and sample 9, it is better to provide the textured surface on the peripheral wall than on the flexible film, and it is even better to provide it on both the flexible film and the peripheral wall. I understood.

11, 21, 31 Viscous fluid filled damper (damper)
DESCRIPTION OF SYMBOLS 12 Viscous fluid 13 Airtight container 14 Perimeter wall 14a Holding part 14b Locking surface 14c Adhering surface 14d Inner peripheral surface 15 Flexible film 15a Mounting recessed part 15b Bellows part 15c Extension part 15d Protrusion 16 Lid 16a Adhering surface
101, 201 Damper filled with viscous fluid
102, 202 Viscous fluid
103, 203 Airtight container
104,204 perimeter wall
105, 205 Flexible membrane
105a, 205a Mounting recess
106,206 lid
107 Support
108 Supported body N Screw

Claims (5)

A flexible film made of a rubber-like elastic body that has a mounting recess fixed to one of the support and the supported body at one end and fluctuates under vibration, a cylindrical peripheral wall made of hard resin, A lid that closes one end and adheres to either the support or the supported body, and a fixing structure that fixes the end of the flexible film by pressing between the peripheral wall and the lid In a damper that is arranged between a support and a supported body to attenuate the vibration of the supported body,
The flexible membrane extends from the mounting recess to the peripheral wall, extends from the bellows part to the lid along the peripheral wall, and comes into contact with and separates from the peripheral wall when subjected to vibration. And a protrusion pressed between the peripheral wall and the lid,
A damper characterized in that a textured surface having irregularities is formed on a contact surface between a peripheral wall and an extension portion in contact with the peripheral wall.   2. The damper according to claim 1, wherein the surface roughness of the embossed surface provided on the peripheral wall is formed to be greater than the surface roughness of the embossed surface provided on the flexible film. A flexible film made of a rubber-like elastic body that has a mounting recess fixed to one of the support and the supported body at one end and fluctuates under vibration, a cylindrical peripheral wall made of hard resin, A lid that closes one end and adheres to either the support or the supported body, and a fixing structure that fixes the end of the flexible film by pressing between the peripheral wall and the lid In a damper that is arranged between a support and a supported body to attenuate the vibration of the supported body,
The flexible membrane extends from the mounting recess to the peripheral wall, extends from the bellows part to the lid along the peripheral wall, and comes into contact with and separates from the peripheral wall when subjected to vibration. And a protrusion pressed between the peripheral wall and the lid,
A damper characterized in that a textured surface having irregularities is formed on a contact surface on the peripheral wall side where the extension portion and the peripheral wall are in contact with each other. A flexible film made of a rubber-like elastic body that has a mounting recess fixed to one of the support and the supported body at one end and fluctuates under vibration, a cylindrical peripheral wall made of hard resin, A lid that closes one end and adheres to either the support or the supported body, and a fixing structure that fixes the end of the flexible film by pressing between the peripheral wall and the lid In a damper that is arranged between a support and a supported body to attenuate the vibration of the supported body,
The flexible membrane extends from the mounting recess to the peripheral wall, extends from the bellows part to the lid along the peripheral wall, and comes into contact with and separates from the peripheral wall when subjected to vibration. And a protrusion pressed between the peripheral wall and the lid,
A damper characterized by forming a textured surface having irregularities on the contact surface on the extension portion side where the extension portion and the peripheral wall contact.   The damper according to any one of claims 1 to 4, wherein the damper is a viscous fluid-filled damper having a viscous fluid in an internal space formed by the flexible membrane, the peripheral wall, and the lid.

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