JPH08121529A - Vibration control device - Google Patents

Abstract

PURPOSE: To prevent a movable piece and an exciting coil or the like from being moved by a dead weight or the like when an engine is mounted. CONSTITUTION: A main chamber 6 and a sub-chamber 7 are arranged above and below by sandwiching a partition plate 2 between them. An outside diaphragm 29 is arranged to partition a part between the sub-chamber 7 and an air chamber 8. A vibrator 1 composed of a movable piece 11 or the like is arranged to forcedly excite liquid of the main chamber 6. This vibrator 1 is composed of a rod 12 whose one end is connected to the movable piece 11 and other end is connected to a bobbin 131 having an exciting coil 13, a permanent magnet 14 to perform a mutual action with the exciting coil 13, yokes 15 and 16 to support the permanent magnet 14 or the like. A cylinder chamber 211 is arranged around the movable piece 11, and an inside diaphragm 22 is arranged so as to block up a lower part of this cylinder chamber 211. The rod 12 is arranged in a central part of the inside diaphragm 22, and the inside diaphragm 22 and the outside diaphragm 29 are formed in a discontinuous condition.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a liquid-filled type vibration isolation device, and more particularly, it has a vibrator in a main chamber in which a liquid is filled, and the vibrator is vibrated at a specific frequency.
The present invention relates to an improvement of a liquid-filled type vibration damping device with a vibrator that causes liquid resonance to obtain a low dynamic spring constant for vibration of a specific frequency.

[0002]

2. Description of the Related Art Among vibration isolation devices, particularly in engine mounts for automobiles, an engine, which is a power source, is operated under various conditions from idling to the maximum rotation speed. Because it is used, it must be able to handle a wide range of frequencies. In general, a vibration control device as an engine mount is designed for idling vibration, which is targeted for torque fluctuations due to explosive combustion of the engine.
Alternatively, the system is set (tuned) for the purpose of isolating vibrations such as engine shake that causes the engine to resonate due to vibrations transmitted from the suspension mechanism. In recent years, engine mounts have been tuned for the purpose of blocking muffled noise associated with vibrations of relatively high frequencies of about 100 Hz to 600 Hz. In order to meet such a plurality of conditions, a so-called voice coil type in which a liquid chamber is provided inside, and further a vibrator including a voice coil that vibrates at a specific frequency is provided inside the liquid chamber The liquid-filled type vibration damping device has already been devised, and is known from, for example, Japanese Patent Laid-Open No. 5-99262.

[0003]

By the way, in these known devices, a movable piece is provided in a liquid chamber, a voice coil composed of an electromagnet or the like for driving the movable piece is provided, and the voice coil and the movable piece are idling-vibrated. To a specific frequency, such as a specific frequency targeted for, or a specific frequency targeted for vibration related to muffled sound (vibration), thereby causing liquid resonance in the liquid chamber. There is something. By this liquid resonance phenomenon, a low dynamic spring constant (low dynamic spring characteristic) is formed, and by the action of this low dynamic spring characteristic, the vibration related to the muffled sound or the like is cut off. However, in these known devices, for example, as shown in FIG. 8, a rod 120 forming a part of the vibrator 10 is formed so as to penetrate a central portion of a diaphragm 290 that partitions the sub chamber 70 and the air chamber 80. Therefore, the influence of the operation of the diaphragm 290 also extends to the rod 120.

Therefore, the vibration damping device having these configurations is
When the engine mount is installed between the vehicle body and the engine, the insulator 50, the main chamber 60, and the like are operated (displaced) by the mass (static load) of the engine. As a result, the liquid in the main chamber 60 flows to the side of the sub chamber 70 via the orifice 30, and the diaphragm 290 is moved (deformed) downward as shown by the chain double-dashed line. By the downward deformation of the diaphragm 290, the rod 120 and further the exciting coil 130 are moved downward. As a result, the excitation coil 130
The relative positional relationship between the permanent magnet 140 and the permanent magnet 140 is deviated, and the vertical excitation force that should be generated by each magnetic field action may be reduced. That is, there is a problem that the vertical excitation force of the movable piece 110 connected to the excitation coil 130 is reduced. Further, the rod 120 connected to the movable piece 110 and the excitation coil 130 has a soft diaphragm 2 as shown in FIG.
Since it is installed at the center of 90, the rod 120 is easy to move in the radial direction of the diaphragm 290. As a result, the movable piece 11
0 and the oscillating coil 130 and the like actuate in the vertical direction, they are accompanied by lateral wobbling motion, and the oscillating coil 130 comes into contact with the permanent magnet 140 or the yokes 150 and 160 and the like installed around the oscillating coil 130. There is a risk that That is, there is a possibility that the vibration coil 130 and the like may make a prying motion. In order to solve these problems, a liquid-filled type vibration damping device in which the vibration coil, the movable piece, etc. are prevented from moving downward due to a static load or causing lateral vibration. It is an object (problem) of the present invention to provide the above.

[0005]

In order to solve the above-mentioned problems, the following measures are taken in the present invention. That is, a connecting fitting attached to the vibrating body side,
A bracket attached to a member or the like on the vehicle body side, an insulator provided between the connecting metal fitting and the bracket for blocking vibration from the vibrating body, and provided in series with the insulator, and having an incompressible fluid ( Liquid), a main chamber and a sub chamber, an orifice for flowing a liquid between the main chamber and the sub chamber, a partition plate for partitioning the main chamber and the sub chamber, and a compressive fluid. An air chamber into which air is introduced, a diaphragm partitioning the air chamber from the sub chamber, and one provided on the side facing the main chamber, the liquid in the main chamber having a specific frequency. Regarding a liquid-filled type vibration damping device including a vibrator that vibrates so as to cause liquid resonance, one end of the vibrator is coupled to the movable piece that vibrates the liquid in the main chamber, and the movable piece. Both ends A cylinder connected to an exciting coil to which an alternating current is supplied, and a permanent magnet that acts as a relative magnetic field between the rod and the exciting coil. The cylinder surrounds the movable piece. Set up a room,
Furthermore, a first diaphragm is provided so as to close the lower part of the cylinder chamber, and the first diaphragm is separated from the diaphragm (second diaphragm) that partitions the sub chamber from the air chamber. It was decided to adopt a configuration in which the non-coupling form of

Further, in the liquid-filled type vibration damping device having such a structure, the movable piece and the exciting coil are provided below the cylinder chamber in which the movable piece forming a part of the vibrator is housed. The configuration is such that a damper is provided to prevent lateral deflection of the rod provided between them.

[0007]

By adopting the above construction, the following effects are exhibited in the present invention. That is, the vibration from the vibrating body side is propagated to the insulator 5 made of a vibration-proof rubber or the like via the connecting fitting 91 as shown in FIG. As a result, the insulator 5 vibrates or displaces to absorb and block most of the input vibration. Therefore, most of the vibrations are blocked at the insulator 5, but some of the vibrations, such as vibrations related to muffled noise, are not absorbed at the insulator 5 but propagate to the holder 92 and the like. There is a risk. With respect to vibrations that cannot be absorbed at these insulators 5, a low dynamic spring constant is formed by causing the liquid in the main chamber 6 to resonate, thereby absorbing and blocking vibrations of a specific frequency. It is what

In addition to these, in the present invention, the movable piece 1 is installed even when a static load of the engine itself is applied by installing the anti-vibration device between the engine and the member on the vehicle body side.
1 or the vertical positional relationship of the vibration coil 13 or the like is not changed. That is, the relative positional relationship (vertical positional relationship) between the exciting coil 13 and the permanent magnet 14 is kept unchanged. Therefore, since both of them are always kept in the regular position, when the exciting coil 13 is loaded with an alternating current, the exciting coil 13 and the permanent magnet 14 have a relative magnetic field action. Therefore, the regular vibration motion is performed. As a result, the movable piece 11 accurately vibrates the liquid in the main chamber 6.

That is, in FIG. 1, when a static load from the engine or the like is input to the connecting fitting 91, the insulator 5 is displaced (deformed) downward through the connecting fitting 91. By this deformation, the liquid in the main chamber 6 is compressed, but this liquid flows to the sub chamber 7 via the orifice 3. When the liquid flows into the sub-chamber 7, the sub-chamber 7 is partially formed by the second diaphragm 29 made of a relatively soft rubber material or the like. 29 is easily deformed to the air chamber 8 side as shown by the two-dot chain line.

As a result, the pressure in the main chamber 6 does not rise, and the movable piece 11 and the like do not move vertically. The rod 1 is provided so as to close the lower portion of the cylinder chamber 211 in which the movable piece 11 is housed and is connected to the movable piece 11.
The first diaphragm 22 provided so as to be coupled with the second diaphragm 22 is provided separately from the second diaphragm 29, and each of them is formed in a non-coupling state. The second diaphragm 29 is displaced (actuated)
Even if it does, no influence is exerted on the first diaphragm 22 and the rod 12 and the like connected to the first diaphragm 22. Therefore, the vertical positions of the movable piece 11 and the excitation coil 13 do not change. In addition, the same can be said when a large load is input to the insulator 5 when the vehicle having the vibration damping device goes over bumps or the like.

In addition to the above-mentioned invention, in a structure having a damper 4 as shown in FIG. 2, the damper 4 has a concentric bellows shape in a plan view. Since the rod 12 is installed at the center of the bellows-shaped damper 4, the rod 12 does not shake laterally. In other words, the rod 12 does not make a miso-moving motion or the like due to lateral shake when moving up and down. Therefore, the vibrating coil 13 attached to the lower portion of the rod 12 does not perform whirling motions, and the permanent magnets 14 caused by the whirling motions or the like.
Also, contact with the yokes 15, 16 and the like is avoided. In the present invention, the damper 4 for restricting the lateral wobbling motion of the rod 12 is designed to hold the rod 12 at its central portion, so that the damper 4 is generally compact. . Therefore, the space is not taken so much, and the air chamber 8 formed in the lower portion of the cylinder chamber 211 is compactly assembled, so that the space can be saved. As a result, the size of the entire vibration damping device including the vibrator 1 can be reduced.

[0012]

DESCRIPTION OF THE PREFERRED EMBODIMENTS A first embodiment (first embodiment) of the present invention will be described with reference to FIGS. The configuration of this embodiment is
As shown in FIG. 1, a connecting fitting 9 attached to the vibrating body side.
1 and a bracket 9 attached to a member or the like on the vehicle body side
5, an insulator 5 which is located between the connecting metal fitting 91 and the bracket 95 and blocks vibration from the vibrating body, and is provided in series with the insulator 5.
Further, a main chamber 6 and a sub chamber 7 in which an incompressible fluid (liquid) is enclosed, an orifice 3 for flowing a liquid between the main chamber 6 and the sub chamber 7, the main chamber 6 and the sub chamber 7 A partition plate 2 for partitioning the space between the air chamber 8 and the air chamber 8 into which air that is a compressive fluid is introduced; a second diaphragm (outer diaphragm) 29 for partitioning the space between the air chamber 8 and the sub chamber 7; The main chamber 6 is provided on the side facing the main chamber 6.
It is basically composed of a vibrator 1 for vibrating the liquid therein so that the liquid resonates at a specific frequency.

In such a basic structure, as shown in FIG. 1, the vibrator 1 has a movable piece 11 facing the main chamber 6, a bobbin 131 made of electromagnetic soft iron or the like, and an outside of the bobbin 131. Ring-shaped excitation coil 1
3 and a bobbin 131 provided with the excitation coil 13
In addition, one end of the rod 12 is connected to the movable piece 11, and the other end of the rod 12 is connected to the movable piece 11. The movable piece 11 of the vibrator 1 having such a configuration is housed in the cylinder chamber 211 provided in the central portion of the partition plate 2, and the cylinder chamber 2
It is adapted to slide up and down in the inside of 11.

As shown in FIG. 1, the cylinder chamber 211 has an opening formed in the central portion of the partition plate 2, a flange 25 provided around the opening, and the flange 2.
5 and a ring 21 attached to the lower part of 5. In addition, this ring 21
As shown in FIG. 3, it is made of a cylindrical member, and a plurality of protrusions 219 are provided in the upper part. The protrusions 219 are provided in the peripheral part of the flange 25. The flange 25 of the partition plate 2 is engaged with the flange 25 of the partition plate 2 by engaging with the engaging hole 255 formed therein and bending the tip of the protrusion 219 as shown by the chain double-dashed line in FIG.
It is designed to be attached around the.
Then, the ring 21 after being attached in this way
The cylinder chamber 211 is formed by the flange 25 and the flange 25.

An inner diaphragm 22 which is a first diaphragm is provided below the cylinder chamber 211 so as to close the lower portion of the cylinder chamber 211 with the rod 12 at the center. ing. And
On the outside of the ring 21, which is the outside of the cylinder chamber 211 in which the inside diaphragm 22 is attached,
An outer diaphragm 29 that is a second diaphragm that partitions the sub chamber 7 and the air chamber 8 is provided. The outer diaphragm (second diaphragm) 29
The inner diaphragm (first diaphragm) 22 and the inner diaphragm 22 are separate members, and the operations of the two are not coupled. Further, in both of these diaphragms, the outer diaphragm 29 is the inner diaphragm 2
It is formed to be softer than 2.

The cylinder chamber 211 having such a structure
The bobbin 131 provided below the bobbin 131 and the excitation coil 13 provided on the outside of the bobbin 131 are made of conductive windings. Is designed to be energized. A permanent magnet 14 that performs a relative magnetic field action with the excitation coil 13 is provided outside the excitation coil 13, and the permanent magnets 14 are provided above and below the permanent magnet 14. The yokes 15 and 16 for applying the magnetic field of the magnet 14 to the excitation coil 13 are provided. Therefore, the yoke 1
Reference numerals 5 and 16 are made of magnetic material such as electromagnetic soft iron.

With the rod 12, the vibration coil 13, the permanent magnet 14, the yokes 15 and 16 and the like having the above-mentioned structure being assembled, the bracket 95 serving as a connecting member to the housing 93 and members on the vehicle body side is assembled. It is designed to be stored. Then, the insulator 5 and the like are mounted above the housing 93 accommodating the vibrator 1 assembled in this way through the holder 92, so that a liquid-filled type vibration damping device having the vibrator 1 inside is provided. To be formed.

The operation mode and the like of this embodiment having such a configuration will be described. That is, as shown in FIG. 1, the vibration from the vibrating body is propagated to the insulator 5 made of a rubber material or the like via the connecting metal fitting 91. At the insulator 5, most of the vibration is absorbed. , Will be cut off. However, some of them cannot be absorbed at the insulator 5 and may be propagated to the vehicle body side through the holder 92, the bracket 95, and the like. Therefore, in this embodiment,
The vibration of the component (frequency) that could not be absorbed in the insulator 5 is transmitted to the liquid chambers such as the main chamber 6 and the sub chamber 7 provided in the lower portion of the insulator 5, and further to the inside of the main chamber 6. It is intended to absorb or block by the action of the provided vibrator 1 or the like.

In particular, the muffled sound caused by vibration of relatively high frequency is the frequency (frequency) of the object.
Is in a relatively high frequency range of about 100 Hz to 600 Hz, and this case will be described with reference to FIG. In this case, by passing an alternating current through the exciting coil 13 of the vibrator 1, the exciting coil 13 is vibrated between itself and the permanent magnet 14. That is, the exciting coil 13 and the bobbin 13 that holds the exciting coil 13
Vibrate 1. The bobbin 131 and the excitation coil 13
The vibration of vibrates the movable piece 11 via the rod 12. Due to the vibration of the movable piece 11, the main chamber 6
The incompressible fluid (liquid) inside is vibrated, which causes
The liquid vibrates, but if the state of the vibration at this time, especially the phase thereof, matches the vibration propagating through the insulator 5, the liquid causes liquid resonance. Further, this suppresses the increase in the liquid pressure in the main chamber 6. As a result, the dynamic spring constant formed by the vibration of the insulator 5 and the liquid resonance phenomenon in the main chamber 6 is
It will be formed to a low value. That is, a low dynamic spring constant is formed, whereby relatively high-frequency vibration, which is the basis of muffled noise, is blocked by the vibration isolator.

Further, in such a state, when a large static load is applied to the insulator 5, the insulator 5 is largely displaced, and this large displacement is caused by the liquid in the main chamber 6. Will be compressed. However, the compressed liquid flows to the sub chamber 7 through the orifice 3 and the outer diaphragm 2
By deforming only 9, the displacement of the insulator 5 due to the large load is absorbed. Therefore,
No large displacement occurs in the movable piece 11. On the other hand, the outer diaphragm 29 and the inner diaphragm 22 are separated, and the deformation of the outer diaphragm 29 does not actuate the rod 12 connected to the inner diaphragm 22. For these reasons, the exciting coil 13 connected to the rod 12 is not moved. Therefore, even if a large static load is applied, the relative positional relationship between the exciting coil 13 and the permanent magnet 14 does not shift.

Next, a second embodiment (second embodiment) of the present invention will be described with reference to FIGS. 2 and 4 to 7. The configuration of this embodiment is basically the same as that of the first embodiment. As shown in FIG. 2, the difference is that a damper 4 for lateral shake prevention is provided so that the movable piece 11, the rod 12, the excitation coil 13 and the like forming the vibrator 1 do not laterally shake during operation. That is what is being done. That is, the skirt 215 is provided below the ring 21 forming the cylinder chamber 211, the damper 4 formed of a concentric bellows is provided at the end of the skirt 215, and the rod 12 is provided at the center of the damper 4. It has a configuration provided.

The damper 4 is made of paper or plastic material and corresponds to a damper provided around the voice coil of the speaker. Therefore, the rod 12 provided at the center of the damper 4
Can slide in the vertical direction via the damper 4, but its movement is restricted in the lateral direction, that is, in the radial direction of the damper 4. The specific structure around the lower portion of the cylinder chamber 211 provided with the damper 4 and the like is as shown in FIGS. 4 to 7. That is, as shown in FIG. 6, the damper 4 formed in a concentric bellows shape.
The peripheral edge portion of the above is joined to the peripheral edge portion of the umbrella-shaped skirt 215 by an adhesive means or the like. Next, although integrated in this way, the center of the skirt 215 is coupled to the lower part of the ring 21 as shown in FIG. It is formed in the lower part of 211.

In particular, when connecting them, the skirt 215 is formed in the vicinity of the central portion thereof and the upper surface portion thereof is shown in FIG.
And, as shown in FIG. 6, a plurality of engaging recesses 2 are formed at equal intervals.
12 is provided, and the engagement recess 212 is provided.
As shown by the broken line in FIG. 5, a part thereof has a bag shape, and an engaging claw 218 is provided below the ring 21 that engages with the skirt 215. Therefore, the skirt 215 and the ring 21 are connected by engaging (fitting) the engaging claw 218 with the bag-shaped portion of the engaging recess 212. The damper 4 having such a configuration
7. The lower end of the ring 21 forming the lower part of the cylinder chamber 211 by installing the rod 12 in the center of the cylinder 4 and connecting the center of the damper 4 and the rod 12 with adhesive means or the like as shown in FIG. The damper 4 is attached to the part.

Next, the operation mode and the like of the present embodiment having such a configuration will be described. By the way, the operation mode and the operation of this embodiment are basically the same as those of the first embodiment. In addition to these, in the present embodiment, in the lower part of the cylinder chamber 211,
Since the damper 4 is provided on the rod 12,
When the vibrating coil 13 operates and the rod 12 and the movable piece 11 and the like move up and down, the damper 4 can freely move up and down, but the radial or lateral movement is restricted. It will be. Therefore, the excitation coil 1 mounted via the rod 12
3, the lateral swing motion is restricted, and the permanent magnet 14 or the yokes 15, 1 and 1 are activated during the operation.
No contact with 6 etc. That is, it is possible to avoid the twisting phenomenon. Further, since the damper 4 having such a function is attached to the lower portion of the cylinder chamber 211 and around the rod 12, the shape can be reduced. It is possible to reduce the weight and save the space.

[0025]

According to the present invention, the coupling fittings attached to the vibrating body side, the brackets attached to the members on the vehicle body side, and the coupling fittings and the brackets are located between the coupling fittings and the brackets to isolate vibrations from the vibrating body. An insulator, a main chamber and a sub-chamber provided in series with the insulator and in which an incompressible fluid (liquid) is enclosed, and an orifice for flowing a liquid between the main chamber and the sub-chamber, A partition plate that partitions the main chamber and the sub chamber, an air chamber into which air that is a compressive fluid is introduced, a diaphragm that partitions the air chamber and the sub chamber, and faces the main chamber A liquid-filled type vibration damping device which is provided on the side of the main chamber and vibrates the liquid in the main chamber so as to resonate the liquid at a specific frequency. To A relative magnetic field between a vibrating movable piece, a rod whose one end is coupled to the movable piece and whose other end is connected to an exciting coil to which an alternating current is supplied, and the exciting coil. A cylinder chamber is provided so as to surround the movable piece, and a first diaphragm is provided so as to close a lower part of the cylinder chamber. Since the diaphragm and the diaphragm (second diaphragm) partitioning the sub chamber and the air chamber are separated from each other, they are configured as a non-coupling structure.
Even if a large static load acts on the antivibration device, causing a large displacement at the insulator, the displacement is different from that of the first diaphragm provided at the vibrator, that of the second diaphragm. It was absorbed at the diaphragm of, and did not affect the oscillator side. Therefore, the movable piece and the excitation coil that form the vibrator do not move up and down, the vertical positional relationship between the excitation coil and the permanent magnet does not shift, and the excitation from the excitation coil does not occur. It became possible to obtain sufficient vibration power.

In addition to the above structure, the lateral deflection of the rod provided between the movable piece and the exciting coil is prevented below the cylinder chamber in which the movable piece forming a part of the vibrator is housed. Since a structure for providing a damper has been adopted, the movable piece and the exciting coil do not shake laterally during operation, so that the exciting coil comes into contact with a permanent magnet or the like. There is nothing to do. That is, the exciting coil is no longer twisted between the permanent magnet and the like. Further, since the damper for avoiding such a twisting phenomenon is provided in the vicinity of the cylinder chamber and around the rod in the present invention, it is possible to reduce the size and weight of the damper itself. As a result, it is possible to reduce the size and weight of the entire vibration damping device.

[Brief description of drawings]

FIG. 1 is a vertical sectional view showing the overall configuration of the present invention and the overall configuration of a first embodiment thereof.

FIG. 2 is a vertical sectional view showing the overall configuration of a second embodiment of the present invention.

FIG. 3 is a developed perspective view showing an overall configuration of a partition plate, a flange, a ring and the like forming a part of the cylinder chamber according to the present invention.

FIG. 4 is a view showing a structure of a ring used for joining skirts according to a second embodiment of the present invention.

FIG. 5 is a plan view showing the overall structure of a skirt according to a second embodiment of the present invention.

FIG. 6 is a development view showing a coupling relationship between a skirt and a ring according to a second embodiment of the present invention.

FIG. 7 is a partial cross-sectional view showing an overall configuration of a damper, a skirt and a ring according to the second embodiment of the present invention.

FIG. 8 is a vertical cross-sectional view showing the overall configuration of a conventional example.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 vibrator 11 movable piece 12 rod 13 excitation coil 131 bobbin 14 permanent magnet 15 yoke 16 yoke 2 partition plate 21 ring 211 cylinder chamber 212 engagement recess 215 skirt 218 engagement claw 219 protrusion 22 first diaphragm (inner diaphragm) ) 25 Flange 255 Engagement hole 29 Second diaphragm (outer diaphragm) 3 Orifice 4 Damper 5 Insulator 6 Main chamber 7 Sub-chamber 8 Air chamber 91 Connecting fitting 92 Holder 93 Housing 95 Bracket

Claims (2)

[Claims] 1. A connecting fitting attached to the vibrating body side,
A bracket attached to a member or the like on the vehicle body side, an insulator provided between the connecting metal fitting and the bracket for blocking vibration from the vibrating body, and provided in series with the insulator, and having an incompressible fluid ( Liquid), a main chamber and a sub chamber, an orifice for flowing a liquid between the main chamber and the sub chamber, a partition plate for partitioning the main chamber and the sub chamber, and a compressive fluid. An air chamber into which air is introduced, a diaphragm that separates the air chamber from the sub chamber, and a liquid that is provided on the side facing the main chamber and that is liquid at a specific frequency in the main chamber. In a liquid-filled type vibration damping device including a vibrator that vibrates so as to resonate, the vibrator has a movable piece that vibrates a liquid in a main chamber, and one end of which is coupled to the movable piece. , The other end A cylinder connected to an exciting coil to which an alternating current is supplied, and a permanent magnet that acts as a relative magnetic field between the rod and the exciting coil. The cylinder surrounds the movable piece. Set up a room,
A first diaphragm is provided so as to close the lower part of the cylinder chamber, and the first diaphragm is separated from the diaphragm (second diaphragm) that separates the sub chamber from the air chamber. A liquid-filled type vibration damping device characterized by having a compound structure. 2. The vibration isolator according to claim 1, wherein a rod provided between the movable piece and the vibration coil is prevented from lateral vibration in a lower portion of a cylinder chamber in which the movable piece is housed. A liquid-filled type vibration damping device having a configuration in which a damper is provided.