JPH0626098U - Viscous liquid damper - Google Patents

Abstract

(57) [Summary] [Purpose] To obtain a viscous liquid damper capable of absorbing low-frequency vibrations and also sufficiently absorbing high-frequency vibrations. A structure is provided in which a gap is formed between an inner surface of a concave portion of a side wall of a closed container in which a viscous liquid is sealed and an outer peripheral surface of a holder fitted in the concave portion, and the closed container is freely moved within the gap. To be able to

Description

[Detailed description of the device] [Prior art and its problems]

[0001]

[Industrial applications]

 The present invention relates to a viscous liquid damper having a viscous liquid enclosed therein and having a vibration damping action, and more particularly to a viscous liquid damper useful for vibration isolation of vehicle audio equipment.

[0002]

[Prior art and its problems]

 For example, when an audio device such as a CD player is installed in an automobile, vibration is generated when the automobile is running or when the automobile is stopped. Therefore, it is necessary to take sufficient anti-vibration measures for the audio device that is extremely sensitive to vibration. There is. As a vibration-proof measure for the audio equipment, a closed container in which a viscous liquid is sealed and provided with a stirring section that projects into the viscous liquid and the container, especially the side wall of the container are prevented from being deformed and the closed container is fixed The technique of using a viscous liquid damper composed of a holder that is widely used is widely adopted.

The viscous liquid damper will be described with reference to FIG. 3 showing a schematic cross-sectional view of an example of the viscous liquid damper and a cross-sectional view of the viscous liquid damper taken along the line AA in FIG. The damper comprises a closed container (1) in which a viscous liquid (3) is enclosed and a holder (2). The closed container comprises a thin flexible portion (11), a side wall (12), a bottom portion (13) and a stirring portion (14). The holder is usually provided in order to maintain the shape of the side wall of the closed container of the viscous liquid damper, and is often bonded and integrated with the side wall.

When the viscous liquid damper is adopted to prevent vibration of an acoustic device such as a CD player installed in a car, it absorbs a large amount of vibration even in a low frequency range. Is what you can do. However, it has been pointed out that vibrations in the high frequency range are not sufficiently absorbed.

Therefore, a new technique for absorbing the vibration in the high frequency region as well as the vibration in the low frequency region has been proposed. For example, in Japanese Utility Model Laid-Open No. 3-99250, between the inner peripheral surface of the fitting hole of the stirring section of the viscous liquid damper and the outer peripheral surface of the member inserted into the stirring section, one side in the radial direction is 0.3. A technique for forming a gap of mm or less is disclosed. According to this technique, the stirring portion and the member inserted in the stirring portion can be freely displaced relative to each other in the radial direction in the gap, and therefore, the vibration in the high frequency range can be absorbed. It

According to the above-mentioned method, although the absorption of the vibration in the high frequency range is improved to some extent as compared with the conventional one and the temporary results are obtained, the vibration is not satisfactorily absorbed. That is, the stirring section and the member inserted into the stirring section can be displaced only in the radial direction, and there is no effect on the axial vibration of the member inserted into the stirring section. Furthermore, since a gap is formed between the member to be inserted and the outer peripheral surface, there is the drawback that the inserted member is easy to come off. There is a possibility of breaking through and breaking. After all, the viscous liquid damper is not sufficient in absorbing the vibration in the high frequency range.

[0007]

[The purpose of the device]

 Therefore, the object of the present invention is to remedy the above-mentioned drawbacks and to obtain a viscous liquid damper that absorbs vibrations in a high frequency range to a low frequency range and in each vibration direction to a satisfactory degree.

[0008]

[Means for solving problems]

 The present invention has been proposed to achieve the above-mentioned object, and pays attention to a hermetically sealed container, particularly its side wall and a holder, and forms a gap between the side wall and the holder to achieve the above-mentioned object. I was able to achieve it. That is, according to the present invention, the viscous liquid is sealed in the airtight container, and the airtight container is provided with the agitating part that projects into the viscous liquid, and the holder for holding the damper on the support member. In the viscous liquid damper described above, there is provided a viscous liquid damper characterized in that a gap is provided at least at a part between the holder and the closed container, and the closed container is kept in a movable state. It was

[0009]

[Specific explanation of the device]

 Hereinafter, the present invention will be specifically described with reference to FIG. 1 showing an example of a viscous liquid damper. The viscous liquid damper of the present invention comprises a closed container (1) containing a viscous liquid and a holder (2). The closed container is composed of a stirring section (14), a thin flexible section (11), a side wall (12) and a bottom section (13). An annular recess (15) is formed in the side wall, and the tip of the holder is inserted into the recess. Further, the holder is fixed to a supporting member (not shown) through a hole (21) formed at the other end. A gap (17) is formed between the inner surface of the recess and the outer peripheral surface of the holder, and a gap is also formed between the outer peripheral surface of the side wall of the closed container and the holder. Is desirable. The distance of the gap is usually 0.5 mm or less, preferably 0.3 mm or less. The present invention has an important technical feature in that the closed container is allowed to move freely within the gap.

An example of using the viscous liquid damper of the present invention will be specifically described. An example of holding the CD player using the damper will be described with reference to FIG. 2 which is a schematic cross-sectional view. The damper is provided on a support tool (not shown) fixed to the body of the CD player (5). The pin (51) and the viscous liquid damper are fitted and retained in the holes of the stirring section of the closed container. The viscous liquid damper is fixed by a holder. This holder is fixed to the support member (6) by any method. Even if the support member shakes due to, for example, vibration of an automobile, the vibration of the support member is almost absorbed by the movement of the closed container of the viscous liquid damper and the flow of the viscous liquid. That is, when vibration in a high frequency range is applied, the hermetically sealed container itself makes relative movement within the gap formed between the holder and the hermetically sealed container, and transmission of the vibration is prevented. Further, when vibration in the low frequency range is applied, the transmission of the vibration is prevented for the same reason as the conventional viscous liquid damper.

The side wall of the closed container is preferably made of the same material as that of the thin flexible portion, that is, soft rubber or soft resin from the viewpoint of manufacturing, but may be made of hard rubber or the like. The thickness of the holder may vary depending on the thickness of the holder, but it is usually 2 to 5 mm as long as it has sufficient mechanical strength even when the tip portion of the holder is inserted.

A concave portion into which the tip of the holder can be inserted is formed on the side wall thereof. The cross-sectional shape of the recess may be changed according to the shape of the holder.

The holder is preferably made of hard rubber or resin, but is not limited thereto. Although the thickness of this holder is not limited, it is preferably about 5 mm.

The outer peripheral surface of the side wall of the viscous liquid damper or the surface of the portion of the holder to be inserted into the recess is preferably subjected to physical or chemical surface treatment in order to enhance slidability. For example, it is desirable to adopt a known method such as coating a lubricant or the like on the surface, depositing a filler on the surface to reduce friction, and improving slidability. By applying the surface treatment, the holder and the side wall can be moved smoothly, the vibration absorbing ability in the high frequency range is further improved, the side wall is less worn, and the durability of the viscous liquid damper is also improved.

[0015]

[Effect of device]

 The present invention makes it possible to obtain a viscous liquid damper that is capable of sufficiently absorbing vibrations in a wide range from high frequencies to low frequencies. Therefore, even when a CD player or the like is mounted on an automobile or the like, the vibration transmitted to the device is extremely weak, and it becomes possible to solve the problem of so-called sound skipping.

[Brief description of drawings]

FIG. 1 is a schematic sectional view of an example of a viscous liquid damper of the present invention.

FIG. 2 is a schematic cross-sectional view of an example of supporting a CD damper using the viscous liquid damper of the present invention.

FIG. 3 is a schematic cross-sectional view of an example of a conventionally known viscous liquid damper.

4 is a cross-sectional view taken along the line AA of FIG.

[Explanation of symbols]

 1. Closed container 2. Lid 3. Viscous liquid 4. Holder 5. CD player-6. Support member 10. Viscous liquid damper 11. Thin flexible part 12. Side wall portion 13. Bottom 14. Stirrer 15. 16. Annular recess formed on the side wall 16. Thin flexible part 18. Side wall 21. Holder fixing hole 51. pin

Claims (2)

[Scope of utility model registration request] 1. A closed container, in which a viscous liquid is sealed inside the container, and a stirring section is provided to project into the viscous liquid, and a holder for holding the closed container on a support member. In the viscous liquid damper, a gap is provided at least at a part between the holder and the side wall of the hermetic container, and the hermetic container is kept in a movable state. 2. The viscous liquid damper according to claim 1, wherein a recess is formed in the side wall of the closed container, and at least the tip of the holder is inserted into the recess.