JP5060801B2 - Anti-vibration structure and viscous fluid-sealed rubber damper used for it - Google Patents

Description

The present invention relates to a vibration damping and viscous fluid-sealed Gomudan path to use for it.

  When a CD player is mounted on a vehicle such as an automobile, if vibration generated during traveling of the vehicle or the like is directly transmitted to the main body mechanism unit 60 (see FIG. 4) inside the CD player, sound skipping occurs. In order to prevent this, for example, as shown in FIG. 4, a damper B for absorbing the vibration is interposed between the housing 50 of the CD player and the main body mechanism unit 60, and the main body mechanism section. An anti-vibration structure in which the unit 60 is suspended from the housing 50 by a spring 70 is employed. This makes it difficult for vibration to be transmitted from the housing 50 fixed to the vehicle body side to the main body mechanism unit 60 inside the CD player.

As the damper B, a substantially dome-shaped main body portion 10 having an elastic wall 10a made of sulfur-vulcanized regular butyl rubber, a lid portion 20 that covers the bottom opening of the main body portion 10, and the main body portion 10 There has been proposed a liquid-filled damper B composed of a liquid 30 such as high-viscosity silicone oil sealed in a sealed space formed with the lid 20 (see, for example, Patent Document 1). The liquid-filled damper B is fixed by fitting a fixing claw 50 a formed on the bottom surface of the housing 50 into a fixing groove 10 d formed on the lower peripheral side surface of the main body 10. Further, a concave portion 10b is formed at the top of the substantially dome-shaped main body portion 10. By inserting the metal rod 60a from the main body mechanism portion unit 60 into the concave portion 10b, the liquid-filled damper B is inserted into the main body mechanism portion. The unit 60 is supported from below.
JP 2005-265114 A

  In recent years, in-vehicle electronic devices have become more and more multimedia, and the number of installed models per vehicle has increased. Accordingly, there is a demand for thinner anti-vibration structures for each installed machine. Therefore, as one of the methods for reducing the thickness of the vibration-proof structure, it is conceivable to reduce the thickness of the liquid-filled damper B. However, if the liquid-filled damper B is simply thinned, the metal rod 60a inserted at the top thereof is used. The insertion length of the metal rod 60a is shortened, and the metal rod 60a is easily pulled out by a large vibration. For this reason, a certain amount of insertion length is required, which is an obstacle to thinning the liquid-filled damper B.

The present invention has been made in view of such circumstances, the provision of the viscous fluid-sealed Gomudan path to be used for vibration damping and its thinning of the vibration proof structure is facilitated and its purpose.

In order to achieve the above object, the present invention includes a viscous fluid-filled rubber damper that supports a supported member, and a housing that fixes the viscous fluid-filled rubber damper, and prevents vibration transmission to the supported member. The viscous fluid-sealed rubber damper is configured as described in (I) below, the housing has a fixing claw for fixing the viscous fluid-sealed rubber damper, and the housing of the viscous fluid-sealed rubber damper Is fixed in a state where the fixing claw of the casing is inserted into the fixing groove of the viscous fluid-sealed rubber damper and the lower surface of the viscous fluid-sealing rubber damper is not in contact with the bottom surface of the casing. The vibration-proof structure is a first gist.
(I) A substantially dome-shaped integral main body part, at least part of which is constituted by an elastic wall, a lid part that covers the bottom opening of the main body part, and a sealed space formed by the main body part and the lid part A supporting groove for fitting the supported member on the upper peripheral side surface of the substantially dome-shaped main body, and the supported member directly in the supporting groove. the mounting portion is fitted in, so as to support the supported member, the lower peripheral surface of the generally dome-shaped body portion, is formed a fixing groove for use in securing the viscous fluid-filled rubber damper, like the generally dome A viscous fluid-filled rubber damper in which a drooping portion projects from the ceiling portion of the main body of the main body portion so that the drooping portion gradually narrows toward the tip, and at least a part of the drooping portion is immersed in the liquid viscous fluid .

Further, the present invention is a viscous fluid-filled rubber damper used in the above-described vibration-proof structure, and covers a substantially dome-shaped integral main body portion at least part of which is constituted by an elastic wall, and a bottom opening of the main body portion. A lid, and a liquid viscous fluid sealed in a sealed space formed by the main body and the lid, and supporting the supported member on the upper peripheral side surface of the substantially dome-shaped main body. A groove is formed, and a mounting portion of a supported member is directly fitted into the supporting groove to support the supported member. A viscous fluid is provided on the lower peripheral side surface of the substantially dome-shaped main body. A fixing groove for use in fixing the encapsulated rubber damper is formed, and the hanging portion projects from the ceiling portion of the substantially dome-shaped main body portion so as to gradually become narrower toward the tip, and at least one of the hanging portions is provided. part is immersed in a viscous fluid of the liquid Ri, the lower surface of the viscous fluid filled rubber damper is that the bottom surface of the housing viscous fluid-sealed rubber damper is fixed, the viscous fluid-sealed rubber damper which is formed on the non-contact surface and the second aspect.

  The inventors of the present invention have repeatedly studied the structure of a viscous fluid-filled rubber damper in order to reduce the thickness of the vibration-proof structure. As a result, when a groove is formed in the upper peripheral side surface of the substantially dome-shaped main body portion constituting the viscous fluid-filled rubber damper, and the mounting portion of the supported member is directly fitted into the groove to support the supported member. In addition, the metal rod that has been inserted into the concave portion at the top of the liquid-filled damper in the conventional vibration-proof structure becomes unnecessary, and accordingly, the position of the supported member can be set low, and the vibration-proof structure can be made thin. I found out that I can.

Furthermore, the present inventors have conceived to shorten the vibration stroke of the viscous fluid-filled rubber damper in order to reduce the thickness of the vibration-proof structure. In order to shorten the vibration stroke, it is necessary to make it difficult for the damping performance (anti-vibration performance) to deteriorate over time. However, if a conventional liquid-filled damper is used in an environment with high temperatures in the equipment, It was found that the anti-vibration performance deteriorates with time due to the heat, and the sound skip prevention performance deteriorates. And the cause was that the elastic wall of the liquid-filled damper was made of a sulfur vulcanizate of regular butyl rubber. Therefore, further research was conducted on the material for forming the elastic wall. As a result, assuming that the elastic wall consists of vulcanized rubber composition to lower Symbol (A) ~ (C) as essential components, compression set of the elastic wall is reduced, vibration damping ability is hardly lowered And the present invention has been reached.
(A) Halogenated butyl rubber.
(B) At least one of a thiuram vulcanization accelerator and a dithiocarbamate vulcanization accelerator.
(C) Zinc oxide.

In the viscous fluid-sealed rubber damper of the present invention, a groove for fitting the supported member is formed on the upper peripheral side surface of the substantially dome-shaped main body, so that the mounting portion of the supported member is directly fitted into the groove. Thus, the supported member can be supported at a low position. For this reason, the vibration-proof structure of the present invention using the viscous fluid-filled rubber damper of the present invention can be easily reduced in thickness.

In particular, when the elastic wall of the main body is made of a rubber composition vulcanizate having the following components (A) to (C) as essential components, the compression set of the elastic wall can be reduced, It is possible to make it difficult to reduce the vibration isolation performance. This makes it easy to shorten the vibration stroke of the viscous fluid-sealed rubber damper of the present invention, and makes it easier to reduce the thickness of the vibration-proof structure of the present invention using the viscous fluid-filled rubber damper of the present invention .
(A) Halogenated butyl rubber.
(B) At least one of a thiuram vulcanization accelerator and a dithiocarbamate vulcanization accelerator.
(C) Zinc oxide.

  And, when a hanging part protrudes from the ceiling part of the substantially dome-shaped main body part and at least a part of the hanging part is immersed in the liquid viscous fluid, when vibration occurs, Since the drooping portion also vibrates and the drooping portion receives resistance by the liquid viscous fluid, the vibration can be attenuated more quickly.

Moreover, since the rubber composition used for the elastic wall of the main body part of the viscous fluid-sealed rubber damper of the present invention has the above-mentioned (A) to (C) as essential components, the compression set is small and the vibration-proof performance is hardly lowered. An elastic wall can be formed.

  Next, embodiments of the present invention will be described in detail with reference to the drawings.

  FIG. 1 shows an embodiment of a viscous fluid-filled rubber damper according to the present invention. The viscous fluid-filled rubber damper A of this embodiment includes a substantially dome-shaped main body 1, a lid 2 that covers the bottom opening of the main body 1, and a sealed space formed by the main body 1 and the lid 2. It consists of the liquid viscous fluid 3 enclosed in the whole. And the groove | channel 1b which fits to-be-supported members, such as the main body mechanism part unit 6 (refer FIG. 2), is formed in the upper peripheral side surface of the said substantially dome-shaped main-body part 1. As shown in FIG. Further, the main body 1 is entirely made of an elastic wall 1a, and the elastic wall 1a is made of a vulcanized product of a rubber composition.

  More specifically, in the present embodiment, the substantially dome-shaped main body portion 1 has a ceiling portion that is thick and protrudes upward, and a supported member is fitted to the peripheral side surface of the protruding portion. The groove 1b to be formed is formed. Further, a drooping portion 1 c is projected from the ceiling portion of the substantially dome-shaped main body portion 1, and the entire drooping portion 1 c is immersed in the liquid viscous fluid 3. The lower portion of the substantially dome-shaped main body 1 is also formed thick, and a fixing claw is provided on the peripheral side surface when the viscous fluid-filled rubber damper A itself is fixed to the housing 5 (see FIG. 2) or the like. A fixing groove 1d to be fitted to 5a (see FIG. 2) or the like is formed.

An example of the vibration isolating structure of the present invention using the viscous fluid-filled rubber damper A is shown in FIG. That is, in FIG. 2, the viscous fluid-sealed rubber damper A has the fixing claw 5 a formed on the bottom surface of the housing 5 fitted in the fixing groove 1 d formed on the lower peripheral side surface of the main body 1. Thus, the housing 5 is fixed. In this state, the lower surface of the viscous fluid-sealed rubber damper A (the lower surface of the lid 2), it has not in contact with the bottom surface of the housing 5 (Incidentally, it is also in contact, it is reference example). In addition, a substantially semicircular notch (attachment portion) 6a formed on the edge of the main body mechanism unit 6 is directly inserted into the groove 1b formed on the upper peripheral side surface of the main body 1. Thus, the main body mechanism unit 6 is supported by the viscous fluid-filled rubber damper A. Further, the main body mechanism unit 6 is suspended from the ceiling of the housing 5 by a spring 7.

  As another example of the vibration-proof structure, as shown in FIG. 3, when the mass of the main body mechanism unit 6 is light or can be supported by the main body 1 of the viscous fluid-filled rubber damper A due to required characteristics. May not be suspended by the spring 7 (see FIG. 2).

  2 and 3, the metal rod 60a in the conventional anti-vibration structure shown in FIG. 4 is not necessary, and accordingly, the position of the main body mechanism unit 6 is changed as shown in FIGS. Can be set low. Thereby, since the height of the housing | casing 5 can be made low, a vibration proof structure can be made thin.

  Next, materials for forming the main body 1 (elastic wall 1a), the lid 2 and the liquid viscous fluid 3 constituting the viscous fluid-filled rubber damper A will be described.

  As a material for forming the elastic wall 1a constituting the main body 1, the halogenated butyl rubber (component A) can be used from the viewpoint that the compression set of the elastic wall 1a can be reduced and the vibration-proof performance can hardly be lowered. And a rubber composition comprising at least one of thiuram vulcanization accelerator and dithiocarbamate vulcanization accelerator (component B) and zinc oxide (component C) as essential components. Here, the essential component refers to an optional component, which is a component that is necessarily contained in terms of configuration, and is not subject to quantitative restrictions. Alternatively, butyl rubber or a blend rubber obtained by blending the above-mentioned halogenated butyl rubber with butyl rubber may be used.

  Examples of the halogenated butyl rubber (component A) include chlorinated butyl rubber (Cl-IIR), bromine butyl rubber (Br-IIR) and the like.

  Among the B components, examples of the thiuram-based vulcanization accelerator include Noxeller TT, Noxeller TET, Noxeller TBT and the like manufactured by Ouchi Shinko Chemical Industry Co., Ltd. Among the B components, examples of the dithiocarbamate vulcanization accelerator include Noxeller BZ, Noxeller PZ, Noxeller EZ, Noxeller ZP manufactured by Ouchi Shinsei Chemical Industry Co., Ltd. These may be used alone or in combination of two or more. The content ratio of the B component (thiuram vulcanization accelerator and / or dithiocarbamate vulcanization accelerator) is 100 parts by weight (hereinafter abbreviated as “part”) of the halogenated butyl rubber (component A). On the other hand, it is preferably in the range of 0.3 to 10 parts, particularly preferably in the range of 1 to 3 parts. This is because when the content ratio of the B component is less than 0.3 part, vulcanization becomes insufficient and compression set becomes large. Conversely, when it exceeds 10 parts, vulcanization is quick and easy to scorch, and the cost is high. Because it becomes.

  The zinc oxide (component C) acts as a vulcanization acceleration aid. And the content rate is preferably in the range of 0.5 to 10 parts, particularly preferably in the range of 3 to 7 parts with respect to 100 parts of the halogenated butyl rubber (component A). This is because when the content ratio of zinc oxide (C component) is less than 0.5 parts, vulcanization becomes insufficient and compression set becomes large. On the other hand, when the content ratio exceeds 10 parts, the effect of promoting vulcanization is reduced. (There is little change even if it increases).

  That is, since the elastic wall 1a is made of a thiuram vulcanizate of a halogenated butyl rubber, the compression set is small, and the vibration-proof performance is difficult to be lowered. For this reason, the vibration stroke of the elastic wall 1a can be shortened. Further, in the apparatus (such as a CD player) using the viscous fluid-sealed rubber damper A, the elastic wall 1a is a thiuram vulcanizate or the like. Therefore, unlike the conventional sulfur vulcanizate, the silver plating contact inside the apparatus is black. There is also an effect that there is little pollution property.

  In addition to the above components, the elastic wall 1a is made of a reinforcing agent such as carbon black, a filler, a crosslinking aid, an antioxidant, a processing aid, a flame retardant, an antiaging agent, etc. It may be contained.

  Further, as a material for forming the lid portion 2, a material that can be fixed to the main body portion 1 is selected, and examples thereof include butyl rubber, ABS, polystyrene, acrylonitrile styrene, polymethyl methacrylate, polycarbonate, and polyvinyl chloride. .

  As the liquid viscous fluid 3, a highly viscous liquid such as silicone oil is used. The liquid viscous fluid 3 may be appropriately mixed with powder such as silicone powder.

  The viscous fluid-filled rubber damper A of the present invention can be manufactured, for example, as follows. That is, first, each component material of the elastic wall 1a as described above is prepared, and these are kneaded using a kneader such as a roll, a kneader, a Banbury mixer, a twin-screw kneading extruder, etc. A forming material is prepared. Next, the main body 1 is molded by injection molding into a mold using the forming material. Next, the liquid viscous fluid 3 is injected into the main body 1. On the other hand, the lid part 2 molded by using the forming material of the lid part 2 is separately prepared. Then, the lid 2 is covered with the lid 2 so as to seal the injected liquid viscous fluid 3 (in this case, the main body 1 and the lid 2 are fixed by bonding with an adhesive or the like), thereby the present invention. The viscous fluid-sealed rubber damper A can be obtained.

  The size of the viscous fluid-sealed rubber damper A of the present invention is not particularly limited, but usually the bottom surface (lid portion 2) has a diameter of 11.0 to 30.0 mm and a height of 5.5 to 15. It is set within the range of 0 mm. Moreover, although the thickness of the elastic wall 1a is suitably set by the height position in the main-body part 1 according to the design of vibration proof performance, it is normally set in the range of 0.25-0.5 mm.

  The viscous fluid-sealed rubber damper A of the present invention is, for example, an in-vehicle electronic device (particularly a CD player, a CD-ROM, a DVD-ROM, a navigation system using a hard disk), a hard disk drive for a PC, or a PC. It can be used for vibration isolation of an optical disk drive (CD-ROM drive, etc.).

  In the above-described embodiment, the entire main body 1 is the elastic wall 1a. However, the present invention is not limited to this, and a part of the main body 1 (for example, in the height direction) is not limited to this. Only the intermediate portion) may be used as the elastic wall 1a. In this case, the other portions are made of, for example, a material such as polypropylene, polyamide, acrylonitrile butadiene styrene copolymer (ABS), etc., and are integrally formed by bonding with the elastic wall 1a to form the main body 1. Also good.

Moreover, in the said embodiment, although the liquid viscous fluid 3 was enclosed with the whole sealed space formed with the main-body part 1 and the cover part 2, it is not limited to this, Air is contained in a part of said sealed space. It may be enclosed. Furthermore, the hanging part 1c is protruded from the ceiling part of the main body 1, and the whole hanging part 1c is immersed in the liquid viscous fluid 3, but only a part of the hanging part 1c is immersed in the liquid viscous fluid 3. You may let them. Moreover, although the said drooping part 1c does not need to be formed according to the design of vibration proof performance , it is a reference example .

  Next, examples will be described together with comparative examples. However, the present invention is not limited to the examples.

[Example 1, Comparative Examples 1 and 2]
[Material for forming elastic wall]
Each compounding agent shown in Table 1 described later was prepared in the ratio shown in Table 1, and materials other than sulfur (only Comparative Examples 1 and 2) and a vulcanization accelerator were masticated using a Banbury mixer. Thereafter, the above sulfur (only Comparative Examples 1 and 2) and a vulcanization accelerator were added and kneaded with an open roll to prepare an elastic wall forming material.

[Production of viscous fluid-filled rubber damper]
Using the elastic wall forming material thus obtained, a main body portion made of a substantially dome-shaped elastic wall was produced by injection molding. Then, after injecting silicone oil (SH200, viscosity: 0.5 m ² / s, manufactured by Toray Dow Corning Silicone Co., Ltd.) into the elastic wall (main body portion) by a mandrel, The lid is covered with a lid and the opening surface of the substantially dome-shaped elastic wall (main body) and the lid are fixed by ultrasonic welding, thereby allowing a viscous fluid-filled rubber damper (bottom diameter 13 mm, height 7.5 mm). Was made.

〔Compression set〕
The obtained viscous fluid-filled rubber damper was subjected to a test (at 100 ° C. for 24 hours) in accordance with JIS K 6262 (2006) to calculate the compression set. As a result, those having a compression set of 20% or less were evaluated as “○”, and those exceeding 20% were evaluated as “×”. The viscous fluid-filled rubber dampers of Comparative Examples 1 and 2 had a compression set exceeding 30%.

[Stainlessness of silver plate]
The obtained viscous fluid-sealed rubber damper was left in a high-temperature atmosphere (85 ° C.) for 168 hours, and the contamination state of the silver plate (1 cm × 1 cm) placed 20 mm away from the viscous fluid-sealed rubber damper was visually observed. As a result, the case where there was no contamination such as a black phenomenon was evaluated as “◯”, and the case where contamination was observed was evaluated as “×”.

  From the results of Table 1 above, the viscous fluid-filled rubber damper of Example 1 has a low compression set and no silver plate contamination because the elastic wall is made of a butyl chloride rubber thiuram vulcanizate. On the other hand, the viscous fluid-filled rubber dampers of Comparative Examples 1 and 2 have a large compression set because the elastic wall is made of a sulfur vulcanizate of regular butyl rubber, of which Comparative Example 1 has a higher sulfur content. In Comparative Example 2, where there is silver plate contamination and the sulfur content is low, there is no silver plate contamination.

1 is a partially broken front view showing an embodiment of a viscous fluid-filled rubber damper according to the present invention. It is explanatory drawing which shows typically an example of the vibration isolating structure of this invention using the said viscous fluid enclosure rubber damper. It is explanatory drawing which shows the other example of the said anti-vibration structure typically. It is explanatory drawing which shows typically the anti-vibration structure using the conventional liquid enclosure damper.

Explanation of symbols

A Viscous fluid-filled rubber damper 1 Main body 1a Elastic wall 1b Groove 2 Lid 3 Liquid viscous fluid

Claims (3)

A vibration damping structure that includes a viscous fluid-sealed rubber damper that supports a supported member and a housing that fixes the viscous fluid-filled rubber damper, and prevents vibration transmission to the supported member, wherein the viscous fluid-filled rubber damper is The viscous fluid-sealed rubber damper is fixed to the housing in the following (I), and the viscous fluid-sealed rubber damper is fixed to the housing in the following manner. An anti-vibration structure characterized in that the fixing claw of the housing is fitted into a fixing groove, and the lower surface of the viscous fluid-filled rubber damper is not in contact with the bottom surface of the housing.
(I) A substantially dome-shaped integral main body part, at least part of which is constituted by an elastic wall, a lid part that covers the bottom opening of the main body part, and a sealed space formed by the main body part and the lid part A supporting groove for fitting the supported member on the upper peripheral side surface of the substantially dome-shaped main body, and the supported member directly in the supporting groove. the mounting portion is fitted in, so as to support the supported member, the lower peripheral surface of the generally dome-shaped body portion, is formed a fixing groove for use in securing the viscous fluid-filled rubber damper, like the generally dome A viscous fluid-filled rubber damper in which a drooping portion projects from the ceiling portion of the main body of the main body portion so that the drooping portion gradually narrows toward the tip, and at least a part of the drooping portion is immersed in the liquid viscous fluid . A viscous fluid-filled rubber damper used in the vibration-proof structure according to claim 1, wherein the main body has a substantially dome-like shape and at least a part thereof is formed of an elastic wall, and a lid that covers the bottom opening of the main body A liquid viscous fluid sealed in a sealed space formed by the main body portion and the lid portion, and a support groove for fitting a supported member to the upper peripheral side surface of the substantially dome-shaped main body portion The mounting portion of the supported member is fitted directly into the supporting groove to support the supported member, and the viscous fluid-filled rubber damper is provided on the lower peripheral side surface of the substantially dome-shaped main body portion. A fixing groove for use in fixing is formed, and the hanging portion projects from the ceiling portion of the substantially dome-shaped main body portion so that the hanging portion gradually narrows toward the tip, and at least a part of the hanging portion is provided. We are immersed in a viscous fluid of the liquid, Sex fluid filled lower surface of the rubber damper is that the bottom surface of the case, the viscous fluid-sealed rubber damper is fixed body, the viscous fluid-sealed rubber damper, characterized in that it is formed in a non-contact surface. The viscous fluid-filled rubber damper according to claim 2, wherein the elastic wall of the main body portion is made of a vulcanizate of a rubber composition having the following (A) to (C) as essential components.
(A) Halogenated butyl rubber.
(B) At least one of a thiuram vulcanization accelerator and a dithiocarbamate vulcanization accelerator.
(C) Zinc oxide.

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