JPH05180263A - Fluid enclosure type vibration control device - Google Patents

Abstract

PURPOSE:To change over and control a vibrationproofing characteristic in accordance with input vibration by constituting a part of a fluid chamber wall part of a diaphragm supporting it free to displace through an elastic support member, holding a magnetostrictive element on the back of the diaphragm by way of adding a preload in the expansive direction and changing the magnetic field of the magnetic distortion element. CONSTITUTION:A yoke 60 is pressure welded on the back surface of a diaphragm 32, the diaphragm 32 is pushed up and thereby, a preload in the axial direction in accordance with elastic force of a support rubber 38 is given to a magnetostrictive element 58. By electrifying an alternating electric current to a coil 68, the magnetostrictive element 58 is influenced by a magnetic field roughly in proportion to the electrified electric current, the magnetostrictive element 58 is expansively deformed, deformation influences on the diaphragm 32, and the diaphrag, 32 changes capacity of a pressure chamber 42. By controlling electrification in accordance with a driving state of a power unit, a vibration transmission state to the side of a car body and others and by excitating the diaphragm 32 in accordance with change of internal pressure of the pressure chamber 42, it is possible to control the internal pressure of the pressure chamber 42 and to properly vary a vibrationproofing characteristic in accordance with vibration to isolate.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a fluid filled type vibration damping device used in an engine mount of an automobile or the like, and more particularly to a fluid filled type vibration damping device capable of externally controlling vibration damping characteristics.

[0002]

2. Description of the Related Art Conventionally, as a vibration isolation device interposed between members constituting a vibration transmission system, a first support metal member and a second attachment member attached to each one of the vibration isolation connected or supported members. A vibration-damping device is known in which a support metal fitting and a rubber elastic body interposed between the metal fittings are elastically connected to each other. For example, it is used as an automobile engine mount or a suspension bush. Is coming.

By the way, in such an anti-vibration device, the required anti-vibration characteristics have become more sophisticated as automobiles have become more sophisticated in recent years. As disclosed in Japanese Laid-Open Patent Publication No. 57-9340, etc., a plurality of fluid chambers communicating with each other through an orifice passage are formed, and based on the resonance action of the fluid caused to flow through the orifice passage,
Various anti-vibration devices having a structure for obtaining anti-vibration effect have been proposed.

However, in the fluid filled type vibration damping device having such an orifice passage, the vibration damping effect based on the resonance action of the fluid is effective only for the pre-tuned input vibration in a narrow frequency range. When the vibration input in the frequency range higher than that cannot be exerted, the orifice passage is substantially closed to cause high dynamic spring,
Since it is inevitable that the anti-vibration performance will drop significantly,
It has not been possible to obtain satisfactory vibration damping characteristics.

[0005]

The present invention has been made in view of the circumstances as described above, and a problem to be solved by the present invention is that it is possible to switch and control a vibration isolation characteristic according to an input vibration. Another object of the present invention is to provide a fluid-filled type vibration damping device that can obtain a good vibration damping effect against input vibrations in a wide frequency range.

[0006]

In order to solve such a problem, in the present invention, a first support metal fitting and a second support metal fitting, which are arranged at a predetermined distance from each other, are interposed between them. Fluid-filled type vibration isolation system in which a fluid chamber in which a predetermined non-compressible fluid is enclosed is provided while being connected by a rubber elastic body In the device, a part of the wall portion of the fluid chamber is constituted by a vibrating plate which is displaceably supported by an elastic supporting member by the second supporting metal member, while a magnetostriction is placed behind the vibrating plate. An element is arranged to hold the magnetostrictive element by applying a preload in the expansion / contraction direction between the diaphragm and the second support fitting, and a coil extending in the circumferential direction around the magnetostrictive element. Then, when the coil is energized, the magnetic field changes with respect to the magnetostrictive element. The fluid filled type vibration damping device to exert, it is to its features.

Further, according to the present invention, the first support metal fitting and the second support metal fitting, which are arranged at a predetermined distance from each other, are connected by a rubber elastic body interposed therebetween. In addition, in the fluid filled type vibration damping device, wherein a fluid chamber in which a predetermined incompressible fluid is enclosed is provided by forming a part of the wall portion with such a rubber elastic body, the wall portion of the fluid chamber A part of the second supporting fitting is constituted by a vibrating plate that is displaceably supported via an elastic supporting member,
A magnetostrictive element is disposed behind such a diaphragm so that the magnetostrictive element is held between the diaphragm and the second support fitting, and a permanent magnet that exerts a magnetic field in the expansion / contraction direction on the magnetostrictive element. And a fluid-filled type vibration damping device in which a coil extending in the circumferential direction around the magnetostrictive element is provided, and a magnetic field is changed to the magnetostrictive element by energizing the coil. , Its characteristic.

Furthermore, according to the present invention, the first support metal member and the second support metal member, which are arranged at a predetermined distance from each other, are connected by a rubber elastic body interposed therebetween. In addition, in the fluid filled type vibration damping device, wherein a fluid chamber in which a predetermined incompressible fluid is enclosed is provided by forming a part of the wall portion with such a rubber elastic body, the wall of the fluid chamber is provided. On the other hand, a part of the portion is constituted by a diaphragm that is displaceably supported by the second support fitting via an elastic support member,
A magnetostrictive element is arranged behind the diaphragm, and the magnetostrictive element is held by applying a preload in the expansion / contraction direction between the diaphragm and the second support fitting, and with respect to the magnetostrictive element. A permanent magnet that exerts a magnetic field in the expansion / contraction direction is provided, and a coil that extends in the circumferential direction around the magnetostrictive element is provided, so that the magnetic field is changed by energizing the coil. A fluid filled type vibration damping device is also one of its features.

[0009]

The embodiments of the present invention will now be described in detail with reference to the drawings in order to clarify the present invention more specifically.

First, FIG. 1 shows a specific example of an automobile engine mount having a structure according to the present invention.
In this figure, 10 is a first support metal fitting, and 12 is a second support metal fitting, which are arranged to face each other with a predetermined distance therebetween and are interposed between them.
At 4, they are elastically connected to each other. In the engine mount, one of the first support metal fitting 10 and the second support metal fitting 12 is attached to the power unit side or the body side so that the power unit is vibration-proof supported with respect to the body. Becomes

More specifically, the first support metal fitting 10 has an upper metal fitting 16 and a lower metal fitting 18, each of which has a substantially bottomed cylindrical shape and is provided with outer flange portions 20 and 22 on the peripheral edges of the opening. Are overlapped with each other and are bolted to the outer flange portions 20 and 22. A mounting bolt 19 is provided on the bottom wall of the upper metal fitting 16 so as to project outward, and the first supporting metal fitting 10 is mounted on the power unit side or the body side by the mounting bolt 19. It is designed to be used.

Further, inside the first support fitting 10, between the upper and lower fittings 16 and 18, the upper and lower fittings 1 are provided.
A cavity is formed by the recesses 23 and 25 of 6 and 18. A flexible film 24 having a substantially thin disk shape is accommodated and arranged in the void, and the outer peripheral edge portion is sandwiched between the outer flange portions 20 and 22 of the upper and lower metal fittings 16 and 18. It is installed by. That is, this flexible film 24
Thus, the space is fluid-tightly divided into the recess 23 side of the upper metal fitting 16 and the recess 25 side of the lower metal fitting 18.

On the other hand, the second support fitting 12 is composed of an annular fitting 26 in the shape of a substantially annular block and a bottom fitting 28 in the shape of a cylinder with a bottom having an outer flange portion 27 at the peripheral edge of the opening. .. And the axial end surface of the annular metal fitting 26 is
The second support fitting 12 is formed by being superposed on the outer flange portion 27 of the bottom fitting 28 and integrally connected and fixed by a plurality of bolts 30.

The annular metal fitting 26 constituting the second support metal fitting 12 is positioned so as to face the lower metal fitting 18 constituting the first support metal fitting 10 at a predetermined distance in the axial direction. And the rubber elastic body 14 interposed between the first support fitting 10 and the annular fitting 26,
They are elastically connected to each other. Such rubber elastic body 14
Has a tapered cylindrical shape, and the outer peripheral surface of the cylindrical wall portion of the lower metal fitting 18 is fixed to the opening end surface on the small diameter side, while the annular metal fitting is attached to the opening end surface on the large diameter side. Two
The axial end surface of 6 is fixed. That is, the rubber elastic body 14 is formed as an integrally vulcanization molded product having the lower metal fitting 18 and the annular metal fitting 26.

The rubber elastic body 14 connects the first support fitting 10 and the second support fitting 12 to form an internal space between them. The diaphragm 3 having a disk shape is provided in the internal space.
In the state where 2 spreads in the direction perpendicular to the facing direction of the first supporting metal fitting 10 and the second supporting metal fitting 12, in the facing direction of the first supporting metal fitting 10 and the second supporting metal fitting 12. It is arranged in the middle part.

Further, on the outer peripheral edge of the diaphragm 32,
An annular vertical wall portion 34 that protrudes in the axial direction is integrally provided, and an outer peripheral surface of the vertical wall portion 34 is attached to a mounting ring 36 that is arranged radially outward at a predetermined distance.
They are elastically connected via a support rubber 38 of an annular plate interposed between them. The mounting ring 36 is fixed to the annular metal fitting 26 with a plurality of bolts 40, so that the vibration plate 32 is attached to the second support metal fitting 12. That is, this diaphragm 32
Is attached to the second support fitting 12 so as to be displaceable based on the elastic deformation of the support rubber 38.

By mounting the vibrating plate 32 on the second support fitting 12, the internal space formed between the first support fitting 10 and the second support fitting 12 is fluid-tightly divided into two parts. ing. On the first support fitting 10 side with respect to the vibration plate 32, a pressure receiving chamber 42 is formed by a part of the rubber elastic body 14 in the wall portion, in which a predetermined incompressible fluid is sealed.
Are formed. As the enclosed fluid, for example, water, alkylene glycol, polyalkylene glycol, silicone oil or the like is preferably used.

That is, in the pressure receiving chamber 42, when the vibration is input between the first support fitting 10 and the second support fitting 12, the internal pressure fluctuation is caused by the elastic deformation of the rubber elastic body 14. It has been triggered. As is clear from this, in this embodiment, the pressure receiving chamber 42 constitutes a fluid chamber.

On the other hand, the same incompressible fluid as the pressure receiving chamber 42 is sealed in the recess 25 side of the lower metal fitting 18 among the voids formed inside the first support metal fitting 10. As a result, the recess 25 of the lower metal fitting 18 forms the equilibrium chamber 44 in which the volume change is easily allowed due to the deformation of the flexible film 24. The space on the side of the recess 23 of the upper metal fitting 16 that is located on the opposite side of the equilibrium chamber 44 with the flexible film 24 interposed therebetween is an air chamber 46 that allows the deformation of the flexible film 24. There is.

Furthermore, the pressure receiving chamber 42 and the equilibrium chamber 44
A disc metal fitting 48 is superposed on the bottom wall portion of the lower metal fitting 18 which constitutes a partition wall for partitioning and, and is fixed by a bolt 50. The disc fitting 48 is provided with a circumferential groove 52 extending in the circumferential direction on the overlapping surface with the lower fitting 18. As a result, when they are superposed on the lower metal fitting 18, they extend for a predetermined length in the circumferential direction between the overlapping surfaces of the disc metal fitting 48 and the lower metal fitting 18, and both ends in the circumferential direction are the lower metal fitting 18 and the circle. An orifice passage 54 communicating with the pressure receiving chamber 42 and the equilibrium chamber 44 is formed through a communication hole provided in the plate fitting 48.

When an internal pressure fluctuation is induced in the pressure receiving chamber 42 at the time of vibration input, between the pressure receiving chamber 42 and the equilibrium chamber 44,
The flow of the fluid through the orifice passage 54 produces a predetermined vibration damping effect based on the flow action or resonance action of the fluid. In the present embodiment, the length and cutoff of the orifice passage 54 are adjusted so that a high damping effect can be exerted when a low-frequency large-amplitude vibration such as a shake is input based on the resonance action of the fluid that is made to flow through the orifice passage 54. Area etc. are tuned.

On the other hand, the diaphragm 32 is located inside the bottom metal fitting 28 located on the opposite side of the pressure receiving chamber 42 with the diaphragm 32 interposed therebetween.
A drive means 56 for driving the pressure receiving chamber 4 is accommodated.
The diaphragm 32 is provided behind the diaphragm 32 which constitutes a part of the wall portion.

The driving means 56 is provided with a magnetostrictive element 58 having a circular rod shape. In addition, this magnetostrictive element 5
Upper and lower yokes 60 and 62 made of a ferromagnetic material such as iron are attached to both axial end portions of 8, respectively. Each of the upper and lower yokes 60, 62 has a substantially disc shape as a whole, and has a circular protrusion 64 protruding in the central portion in the axial direction and a protrusion in the outer peripheral edge portion on one surface thereof. And the annular protrusions 66 that integrally form the circular protrusions 64 are integrally provided. It is assembled.

On the outside of the magnetostrictive element 58, a coil 68 wound so as to surround it is provided with the upper and lower yokes 6.
It is arranged between 0 and 62. This coil 68 is provided with a bobbin 70 formed of a non-magnetic material such as an aluminum alloy or a synthetic resin in a state where the bobbin 70 is placed outside the outer peripheral surface of the magnetostrictive element 58 with a predetermined gap therebetween. York 6
It is fixed to No. 2 by an adhesive agent or a bolt. A predetermined gap is also formed between the bobbin 70 of the coil 68 and the upper yoke 60. Thereby, the expansion / contraction deformation in the axial direction of the magnetostrictive element 58 is
The coil 68 can be allowed without being hindered.

Further, a cylindrical permanent magnet 72 is provided outside the coil 68 so as to surround the magnetostrictive element 58 and the coil 68. This permanent magnet 72
Has a magnetic pole portion at both end portions in the axial direction, and is interposed between the opposing surfaces of the annular protrusions 66, 66 of the upper and lower yokes 60, 62. And the axial lower end surface is
The lower yoke 62 is fixed to the protruding end surface of the annular protrusion 66, while the upper end surface in the axial direction is the upper yoke 60.
The ring-shaped protrusion 66 is positioned so as to face the protruding end surface of the ring-shaped protrusion 66 with a predetermined gap therebetween, and is arranged in a state in which the expansion / contraction deformation in the axial direction of the magnetostrictive element 58 is allowed.

That is, as described above, the magnetostrictive element 58, the upper and lower yokes 60 and 62, the coil 68, and the permanent magnet 72.
In the drive means 56 constituted by
The magnetic field generated by energizing 8 is the magnetostrictive element 58.
As a result, magnetostriction (expansion / contraction in the axial direction) is caused in the magnetostrictive element 58.

Incidentally, there, the magnetostrictive element 58
As the material, a general magnetic material such as Alfero can be used. In particular, a magnetic material containing a rare earth element such as terbium (Tb) is used as a magnetostriction amount (displacement or deformation amount).
Since it is large, it is preferably used. Further, particularly in the present embodiment, as the magnetostrictive element 58, a so-called positive magnetostrictive material in which extension deformation is induced by applying a magnetic field is adopted.

In the drive means 56, the upper and lower yokes 60 and 62 and the magnetostrictive element 58 form a magnetic path in the form of a closed magnetic path that magnetically connects both magnetic pole portions of the permanent magnet 72. Thereby, such permanent magnet 7
The magnetic force of 2 is effectively exerted on the magnetostrictive element 58, and therefore, the bias magnetic field is exerted on the magnetostrictive element 58 in the expansion / contraction direction thereof. That is, by exerting such a bias magnetic field, the magnetostrictive element 5
8 has an effect that the magnetostriction sensitivity is improved, and positive and negative expansion and contraction can be advantageously obtained by exerting an alternating magnetic field on the magnetostrictive element 58.
Although the magnitude of the bias magnetic field depends on the material of the magnetostrictive element 58 and the magnitude of pre-compression described later, it is usually effective to apply a magnetic field of about 100 to 10000 Oe.

The driving means 56 as described above is interposed between the vibrating plate 32 and the bottom metal fitting 28, and the upper yoke 60 is attached to the vibrating plate 32 and the lower yoke 62 is attached to the bottom metal fitting 28. However, they are arranged so as to be in contact with each other and fixed. Further, in such an arrangement state, the diaphragm 32
The upper yoke 60 is pressed against the back surface of the
Is pushed upward, whereby a positive axial pre-compression is exerted on the magnetostrictive element 58 of the drive means 56 based on the elastic force of the support rubber 38.

That is, the magnetostrictive element 5 made of a positive magnetostrictive material.
In this embodiment using No. 8, by applying such pre-compression, the magnetostriction sensitivity of the magnetostrictive element 58 can be improved, and a large amount of displacement can be secured. The size of the pre-compression depends on the material of the magnetostrictive element 58 and the like, but it is usually effective to apply a pressure of about 40 to 200 kgf / cm ² .

Therefore, in the engine mount having the above-described structure, by passing an alternating current through the coil 68, the magnetostriction of the magnetostrictive element 5 is caused by the magnetic action of the coil.
Since a magnetic field approximately proportional to the current flowing through the coil 68 is applied to the coil 8, the magnetostrictive element 5
8 is expanded and contracted, and the deformation is exerted on the vibration plate 32, whereby the vibration plate 32 is driven in a direction in which the volume of the pressure receiving chamber 42 is changed.

Therefore, the energization of this coil 68 is
Depending on the operating state of the power unit and the vibration transmission state to the vehicle body side, etc., it controls the amplitude, frequency, phase, etc.,
By vibrating the vibrating plate 32 according to the internal pressure fluctuation of the pressure receiving chamber 42 caused by the input vibration, the pressure receiving chamber 4
It is possible to control the internal pressure of 2, so that the anti-vibration characteristics of the mount can be adjusted according to the vibration to be anti-vibrated.
It can be changed as appropriate.

Specifically, for example, when a low-frequency vibration such as a shake or bounce is input, the vibration plate 32 is vibrated in the same phase as the input vibration to positively generate the internal pressure of the pressure receiving chamber 42 and the orifice. By increasing the flow rate of the fluid that is made to flow through the passage 54, high damping characteristics can be exhibited. On the other hand, at the time of input of medium to high frequency vibrations that cause humming noise,
By vibrating in a phase opposite to the input vibration to absorb or reduce the internal pressure of the pressure receiving chamber 42, low dynamic spring characteristics can be exhibited.

Moreover, since the magnetostrictive element 58 is used as the driving means, a large driving force can be easily obtained and an excellent response speed can be secured, whereby low to high frequencies can be obtained. The internal pressure control of the pressure receiving chamber 42 can be performed effectively and stably at the time of inputting vibrations in a wide frequency range. Incidentally, it is possible to obtain a generated stress of 150 kgf / mm ² or more in the Tb-based magnetic material.

Further, in the engine mount having the above-mentioned structure, since the pre-compression is applied to the magnetostrictive element 58 in the axial direction (expanding / contracting direction), the displacement amount of the magnetostrictive element 58, By extension, the diaphragm 32
The displacement amount of can be obtained more efficiently,
As a result, the desired anti-vibration property can be exhibited advantageously.

Further, in such an engine mount, since the bias magnetic field is exerted on the magnetostrictive element 58, the amount of displacement of the magnetostrictive element 58, that is, the diaphragm 3 is increased.
The displacement amount of 2 can be obtained more efficiently, and the waveform magnetic field centering on the bias magnetic field is exerted on the magnetostrictive element 58 by the application of the alternating current to the coil 68. It also has an advantage that the control of energization to the coil 68 becomes easy.

Further, in the engine mount of this embodiment, since a positive preload is applied to the magnetostrictive element 58 made of a positive magnetostrictive material, the generation of tensile stress in the magnetostrictive element 58 is effectively reduced. This can be prevented, whereby the durability of the magnetostrictive element 58, and thus the mount, can be advantageously ensured.

The embodiments of the present invention have been described in detail above, but these are literal examples, and the present invention should not be construed as being limited to such specific examples.

For example, in the above-described embodiment, the equilibrium chamber 44, which is communicated with the fluid chamber (pressure receiving chamber 42) through the orifice passage 54, is provided, but the orifice passage and the equilibrium chamber need not necessarily be provided. Absent.

Even in the vibration isolator having neither the orifice passage nor the equilibrium chamber, by controlling the internal pressure of the fluid chamber, the above-described effects based on the switching control of the vibration isolation characteristics are effectively exhibited. Can be done.

In addition to the magnetostrictive element made of the positive magnetostrictive material as in the above embodiment, it is also possible to use a magnetostrictive element made of a negative magnetostrictive material which causes contraction displacement or deformation by applying a magnetic field.

Furthermore, it is also possible to apply a negative preload (tensile load) to the magnetostrictive element in order to improve the magnetostrictive sensitivity in accordance with the type of magnetostrictive material.

Further, in the above embodiment, the vibration plate 32 is
With respect to the second support fitting 12, via the support rubber 38,
Although elastically supported, a leaf spring or the like can be used instead of the support rubber 38.

In the above embodiment, the preload and the bias magnetic field are applied to the magnetostrictive element 58. However, only one of the preload and the bias magnetic field is applied to the magnetostrictive element. Also, effective magnetostriction sensitivity can be obtained, and it is not always necessary to provide both the preload and the bias magnetic field.

If the bias magnetic field is not applied to the magnetostrictive element 58, the yokes 60 and 62 and the permanent magnet 72 are unnecessary, so that both ends of the magnetostrictive element 58 in the axial direction are directly connected to the diaphragm. It is also possible to abut and connect to 32 and the bottom fitting 28.

In addition, in the above embodiment, the rubber elastic body 14 is used.
To a so-called non-cylindrical mount type vibration damping device in which the first support metal fitting 10 and the second support metal fitting 12 are fixed to face each other on both sides sandwiching in the vibration input direction,
Although a specific example of the one to which the present invention is applied is shown, in addition, for example, a rubber elastic body in which an inner tubular metal member and an outer tubular metal member arranged at a predetermined distance in a radial direction from each other are interposed therebetween. The present invention can be similarly applied to a so-called cylindrical type vibration damping device which is connected to the.

Further, in the above-mentioned embodiment, a specific example of the present invention applied to an engine mount for an automobile is shown. However, in addition to the above, a body mount, a differential mount, a suspension bush for an automobile, or various devices other than an automobile. It is needless to say that the same can be applied to the anti-vibration device in 1.

Although not listed one by one, the present invention is
Based on the knowledge of those skilled in the art, it can be implemented in various modified, modified, and improved modes, and
It goes without saying that all such embodiments are included in the scope of the present invention without departing from the spirit of the present invention.

[0049]

As is apparent from the above description, in the fluid filled type vibration damping device having the structure according to the present invention, such a magnetostrictive element is changed by changing the magnetic field applied to the magnetostrictive element when the coil is energized. Since the diaphragm is driven (vibrated) based on the displacement (expansion / contraction deformation) of the element, the energization current to the coil is controlled according to the input vibration to control the change in the internal pressure of the fluid chamber and prevent mounting. The vibration characteristics can be changed appropriately.

Moreover, in such a fluid filled type vibration damping device, since the diaphragm is driven based on the displacement of the magnetostrictive element, a large driving force with respect to the diaphragm is provided with an excellent response speed. Therefore, the internal pressure control of the fluid chamber at the time of input of low-frequency large-amplitude vibration that requires a large driving force, and the fluid chamber at the time of input of high-frequency small-amplitude vibration that requires a fast response speed are possible. The internal pressure control can be advantageously and stably performed, and thus the intended vibration damping characteristics can be highly realized over a wide frequency range.

Further, in the fluid filled type vibration damping device according to the present invention, since the preload in the expansion direction or the bias magnetic field is applied to the magnetostrictive element, the sensitivity of the magnetostrictive element is advantageous. It can be improved, the amount of distortion,
As a result, it also has an advantage that the displacement amount of the diaphragm can be secured more efficiently.

[Brief description of drawings]

FIG. 1 is a vertical sectional view showing an engine mount for an automobile as an embodiment of the present invention.

[Explanation of symbols]

 10 1st support metal fittings 12 2nd support metal fittings 26 Annular metal fittings 28 Bottom metal fittings 32 Vibrating plate 38 Support rubber 42 Pressure receiving chamber 56 Drive means 58 Magnetostrictive element 68 Coil 72 Permanent magnet

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Yoshiki Funabashi 3600 Amakutsu, Kita Sotoyama, Komaki City, Aichi Prefecture Tokai Rubber Industry Co., Ltd. 3600 Tokai Rubber Industry Co., Ltd. (72) Inventor Toru Matsui Aizu, Oita, Komaki City, Aichi Prefecture 3600 Address In Tokai Rubber Industry Co., Ltd. (72) Ryoji Kanda, Komaki City, Aichi Prefecture 3600 Tokai Rubber Industry Co., Ltd. (72) Inventor Atsushi Muramatsu Aizu Prefecture Omaki City Oita Kitayama Yamato Atsu 3600 Address Tokai Rubber Industry Co., Ltd. (72) Inoue Keiichi Koichi City Aichi Prefecture Oita Kitayama 3600 Tokai Rubber Industry Co., Ltd.

Claims (3)

[Claims] 1. A first support fitting and a second support fitting, which are arranged at a predetermined distance from each other, are connected by a rubber elastic body interposed therebetween, and a predetermined non-fitting member is provided inside. In a fluid filled type vibration damping device in which a fluid chamber in which a compressive fluid is sealed is provided by forming a part of a wall portion with such a rubber elastic body, a part of the wall portion of the fluid chamber is On the other hand, a vibrating plate which is displaceably supported by an elastic supporting member by a second supporting metal member is arranged, and a magnetostrictive element is disposed behind the vibrating plate, and the magnetostrictive element is connected to the vibrating plate and the vibrating plate. While holding a preload in the expansion and contraction direction with the second support fitting and holding it, a coil extending in the circumferential direction around the magnetostrictive element is arranged, and the magnetostrictive element is energized by energizing the coil. Fluid-filled type vibration damping device characterized by changing the magnetic field . 2. A first support fitting and a second support fitting, which are arranged at a predetermined distance from each other, are connected by a rubber elastic body interposed therebetween, and a predetermined non-fitting member is provided inside. In a fluid filled type vibration damping device in which a fluid chamber in which a compressive fluid is sealed is provided by forming a part of a wall portion with such a rubber elastic body, a part of the wall portion of the fluid chamber is On the other hand, a vibrating plate which is displaceably supported by an elastic supporting member by a second supporting metal member is arranged, and a magnetostrictive element is disposed behind the vibrating plate, and the magnetostrictive element is connected to the vibrating plate and the vibrating plate. A permanent magnet that holds the magnetic field in the expansion / contraction direction with respect to the magnetostrictive element is provided while being held between the second support metal fitting, and a coil extending in the circumferential direction around the magnetostrictive element is further provided. So that a magnetic field change is applied to the magnetostrictive element by energizing the Fluid filled type vibration damping device, characterized in that the. 3. A first support metal member and a second support metal member, which are arranged at a predetermined distance from each other, are connected by a rubber elastic body interposed therebetween, and a predetermined non-conductive member is internally provided. In a fluid filled type vibration damping device in which a fluid chamber in which a compressive fluid is sealed is provided by forming a part of a wall portion with such a rubber elastic body, a part of the wall portion of the fluid chamber is On the other hand, a vibrating plate which is displaceably supported by an elastic supporting member by a second supporting metal member is arranged, and a magnetostrictive element is disposed behind the vibrating plate, and the magnetostrictive element is connected to the vibrating plate and the vibrating plate. A coil is provided that holds a preload in the expansion / contraction direction with the second support fitting and holds the same, and is provided with a permanent magnet that exerts a magnetic field in the expansion / contraction direction on the magnetostrictive element, and further extends in the circumferential direction around the magnetostrictive element. Is provided, and the coil is energized with respect to the magnetostrictive element. Fluid-filled vibration damping device being characterized in that so as to exert a change in field.