JPH06117473A - Viscous fluid filled damper - Google Patents

Abstract

PURPOSE:To provide a damper for a compact precision instrument such as a CD player, compact in shape so as to be fitted in a small space and having a vibration damping characteristic desirable in multiple directions. CONSTITUTION:Flexible films 16 are closed into bag shape, and viscous fluid 18 is filled inside. The mutually opposed flat parts of the films 16 are then provided with fitting parts 20 to a supporting member and a supported member to form a damper 14. When the supporting member and the supported member are relatively displaced, the whole damper 14 is changed in shape to let the viscous fluid 18 therein flow, thus damping vibration.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a damper having a viscous fluid sealed inside.

[0002]

2. Description of the Related Art When a CD player is mounted on a vehicle,
Conventionally, in order to prevent vibration of a vehicle or the like from being transmitted to the main unit of a CD player as it is and causing a skipping sound, the conventional structure shown in FIG.
As shown in (A), the viscous fluid-sealed damper 10 is provided between the main body unit 100 of the CD player supported via the spring 101 and the support member (frame) 102.
4 is performed.

FIG. 2B shows a concrete structure of a conventional damper 104. As shown, the damper 104 is made of rubber or the like and has a thick and cylindrical peripheral wall portion 106. And a bottom portion 108, a thin-folded flexible portion 110, and a stirring portion 112 elastically supported in a floating state by the flexible portion 110, and a viscous fluid 114 is enclosed in a space sealed by these. ing.

A fitting hole portion 116 is provided in the agitating portion 112, and a rigid shaft body 118 made of metal or the like is fitted therein, and the agitating portion 112 is supported by the agitating portion 112 via the shaft body 118 (or supported). Member).

In the damper 104, the agitating portion 112 that has entered into the viscous fluid 114 migrates inside the damper 104 based on the relative displacement between the supporting member and the supported member, and the stirring action at that time, that is, the viscous fluid 114 Viscous flow absorbs energy to block or suppress vibration transmission.

[0006]

In the case of this damper 104, since the vibration is absorbed based on the stirring action of the viscous fluid 114 accompanying the displacement of the stirring portion 112, the peripheral wall portion 10 is absorbed.
6, it is necessary to make the bottom portion 108 and the like thick so as to suppress deformation as much as possible, and the agitating portion 112 is inserted into the inside of the agitating portion 112 and the fitting hole portion 1
Since 16 must be provided, there is a problem that the overall shape is complicated and the manufacturing cost becomes high.

In addition, in order to obtain high damping, the damper 104 deepens the depth of the container composed of the peripheral wall portion 106, the bottom portion 108, etc., and also lengthens the length of the agitating portion 112 that penetrates into the viscous fluid 114. Therefore, there is a problem that the mounting space of the damper 104 becomes large.

The damper 104 has a stirring section 112.
Shows a high damping effect when it is displaced in the vertical direction (or the direction perpendicular to the paper surface) in the figure, and a relatively low damping effect when it is displaced in the horizontal direction in the figure. In addition, there is a problem that the shaft 118 is required for mounting.

[0009]

The present invention has been made in order to solve such a problem, and its gist is to seal a viscous fluid inside a flexible film closed in a bag shape. A supporting member and a mounting portion to the supported member are provided on flat portions of the film facing each other, and when the supporting member and the supported member are displaced relative to each other, the shape of the film is changed and the viscous fluid inside flows. By virtue of this, the vibration is damped.

[0010]

As described above, the damper of the present invention has a form in which a flexible film is closed like a bag and a viscous fluid is enclosed inside, and the damper is flexible in all directions. Is. In the case of the damper of the present invention, when the supporting member and the supported member are displaced relative to each other, the damper changes its shape as a whole, and the viscous fluid in the inside is viscously flowed, and the energy at that time is changed. Vibration is attenuated by absorption.

The damper of the present invention is, so to speak, of an indefinite shape, and it is not necessary to form it into a complicated shape as in the conventional damper shown in FIG. 2 (B), and a good vibration damping effect is exhibited in almost all directions. To do.

In addition, it is not necessary to elongate the stirring portion or deepen the inside of the container as in the conventional damper for damping vibration based on the stirring action of the stirring portion, and the shape is compact and the occupied space is small. Moreover, it has an advantage that a rigid shaft body for mounting is not required.

[0013]

Embodiments of the present invention will now be described in detail with reference to the drawings. In FIG. 1, 10 is a mechanical deck of a main body unit in a CD player, 12 is a support frame, and a damper 14 is interposed between them.

The damper 14 has a bag-like shape in which two flexible resin films 16 are superposed on each other and the upper peripheral portions thereof are closed to form a bag, and a high-viscosity fluid (silicone oil) 18 is enclosed therein. The attachment members 20 are adhesively fixed to the central portion of each film 16 over a predetermined area range, and the attachment members 20 are attached to the mechanical deck 10 and the support frame 12.
It is fixed to.

Here, the resin film 16 has a small temperature dependence of hardness and an extremely thin wall thickness (several μm to several μm).
Resins such as 0.1 mm) PE (polyethylene resin), PET (polyester resin), PA (polyamide resin) are used.

When the mechanical deck 10 and the support frame 12 are displaced relative to each other, the damper 14 of this embodiment changes its shape as a whole and follows it. At that time, the high-viscosity fluid 18 therein is viscously flowed to absorb energy. , Vibration damping is performed.

The damper 14 of this embodiment is a simple one in which the resin film 16 is simply closed in a bag shape and the high-viscosity fluid 18 is sealed inside, and the damper 14 has the advantages that it can be manufactured at low cost and requires a small installation space. Have. In addition, the damping characteristics are not particularly directional, and in addition to damping vibrations in all directions well, damping characteristics in each direction are also excellent.

Table 1 shows the damping characteristics of the damper 14 of this embodiment in comparison with the conventional damper of the embodiment shown in FIG. However, the values in this table show the experimental results in a damper having a size of 30 mm square (square) and a total thickness of 5 mm using a polyamide resin film having a thickness of 15 μm as the film 16.

[0019]

[Table 1]

From the results shown in Table 1, it can be seen that the damper 14 of this example exhibits good vibration damping characteristics over a wide temperature range.

The proper thickness of the resin film 16 in the damper 14 of this example varies depending on the size of the damper 14 as a whole. For example, in the case of the damper having a size of 30 mm square as described above, the thickness is 0. It is desirable to be less than 0.1 mm. Further, it is desirable that the attachment area of the attachment member 20 to the film 16 is 30% or more with respect to the total area on one side.

The embodiment of the present invention has been described in detail above, but this is merely an example, and the present invention can be made of a flexible film made of a rubber material. It can be configured in a form in which various changes are made based on the knowledge of those skilled in the art.

[Brief description of drawings]

FIG. 1 is a diagram of a damper that is an embodiment of the present invention.

FIG. 2 is an explanatory diagram for explaining the background of the present invention.

[Explanation of symbols]

 10 Mechanical Deck 12 Support Frame 14 Damper 16 Resin Film 18 Viscous Fluid 20 Mounting Member

Claims (1)

[Claims] 1. A flexible film is closed in a bag shape, a viscous fluid is sealed inside, and flat portions facing each other of the film are provided with a support member and an attachment portion to a supported member. A viscous fluid-sealed damper, characterized in that when the member and a supported member are displaced relative to each other, the shape of the viscous fluid is totally changed and the viscous fluid in the interior is caused to flow to dampen the vibration.