JPH10331908A - Liquid filling type vibration isolator - Google Patents

Abstract

PROBLEM TO BE SOLVED: To use a small-sized vibrator to propagate great exciting force to liquid staying inside a main chamber. SOLUTION: An insulator 5, a main chamber 6 and an auxiliary chamber 7 enclosing non-compressive fluid, a first orifice 2 for communicating between the main chamber 6 and the auxiliary chamber 7, a partition plate 3 for partitioning between the main chamber 6 and the auxiliary chamber 7, an air chamber 8 into which air as compressive fluid is introduced, and a diaphragm 4 for partitioning between the air chamber 8 and the auxiliary chamber 7 are disposed in series between a connecting metal fitting 91 connected to a vibrator 1 and a holder 95 connected to a member on a chassis side or the like. The vibrator 1 is disposed above the partition plate 3 and on a side of the main chamber 6. The vibrator 1 comprises a permanent magnet 17, a center pole 13, a circular exciting coil 11 disposed around the permanent magnet 17, and a bobbin 15 containing the exciting coil 11. A third liquid chamber 63 is disposed above the vibrator 1 independently of the main chamber 6. A second orifice 62 is provided for connecting the main chamber 6 to the third liquid chamber 63.

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 damping device, and more particularly to a liquid-filled main chamber in which a voice coil type or solenoid type electromagnetic vibrator is provided. BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a liquid-filled type vibration damping device with a vibrator that vibrates a vibrator at a specific frequency, thereby causing liquid resonance to form a low dynamic spring constant for vibration at a specific frequency. .

[0002]

2. Description of the Related Art Among anti-vibration devices, particularly in engine mounts for automobiles and the like, an engine as a power source is operated under various conditions from an idling operation state to a maximum rotation speed. Since it is used, it must be able to handle a wide range of frequencies. Recently, engine mounts have been tuned for the purpose of cutting off noise caused by vibration in a relatively high frequency range. In order to cope with such a plurality of conditions, a so-called voice coil type in which a liquid chamber is provided inside, and a vibrator made of a voice coil or the like vibrating at a specific frequency is further provided in the liquid chamber. The liquid-filled type vibration damping device has already been devised, and is disclosed in, for example, Japanese Utility Model Publication No. 4-39481.

As shown in FIG. 7, for example, as shown in FIG. 7, among the vibrations propagated from the vibrating body side through a connecting fitting 910, various types of vibrations including an idling vibration are used as insulators. 50 actions,
The vibration is cut off by the action of the liquid in the liquid chamber including the main chamber 60 and the sub chamber 70. In this case, first, an alternating current is applied to the exciting coil 110 to thereby attach the exciting coil 110 and the bobbin 150 in which the exciting coil 110 is housed to the permanent magnet 130.
To be vibrated. In particular, by appropriately controlling the value of the alternating current flowing through the vibrating coil 110, the vibrator 10 including the bobbin 150 and the like is vibrated in response to vibration of a specific frequency such as idling vibration, and The liquid in 60 is caused to resonate. Thus, low dynamic spring characteristics can be formed with respect to various vibrations including an idling vibration. As a result, it becomes possible to cut off various vibrations including the idling vibration.

[0004]

By the way, in the prior art, the vibration of the vibrator 10 is controlled by the magnetic force generated by the vibration coil 110 provided on the bobbin 150 and the permanent magnet 1.
This is achieved by the interaction between the magnetic force formed at 30. Therefore, in order to increase the exciting force, the gap between the exciting coil 110 and the permanent magnet 130 or the yoke 140 is made very small, or the exciting coil 110 and the permanent magnet 130 are made large. It is necessary to generate a large magnetic force by shaping. However, there is a natural limit to reducing the gap because the excitation coil 110, which is a movable member, is supported by an elastic body made of rubber or the like. Therefore, in order to obtain a sufficient excitation force, a large excitation coil 110 and a permanent magnet 130 are employed, or lithium (Li) is used as the permanent magnet.
, Etc. must be used. Further, when the input signal to the vibrating mechanism is composed of an alternating current, a signal generator for that purpose is required, and these must be expensive. SUMMARY OF THE INVENTION It is an object (problem) of the present invention to provide an electromagnetic vibration type liquid-filled vibration damping device having an inexpensive vibration mechanism in order to solve such problems.

[0005]

Means for Solving the Problems In order to solve the above problems, the present invention takes the following measures. In other words, according to the first aspect of the present invention, there is a connection fitting attached to the vibrating body side, a holder attached to the member or the like on the vehicle body side, and between these connecting fittings and the holder to block vibration from the vibrating body. An insulator, a main chamber and a sub-chamber provided in series with the insulator and filled with an incompressible fluid (liquid), and a first orifice connecting between the main chamber and the sub-chamber; A partition plate that partitions between the main chamber and the sub-chamber, an air chamber into which air that is a compressible fluid is introduced, a diaphragm that partitions between the air chamber and the sub-chamber, and provided on the partition plate An electromagnetic vibrator that vibrates so that the liquid in the main chamber side resonates with the liquid at a specific frequency,
And a third liquid chamber (third liquid chamber) is provided on the upper part of the vibrator and on the side of the main chamber independently of the main chamber. A second orifice formed between the third liquid chamber and the main chamber so that the liquid in the main chamber flows into the third liquid chamber, and has a predetermined volume. (Second orifice) is provided, and a configuration is adopted in which the input signal to the electromagnetic vibrator is a duty signal in the above configuration.

[0006] By adopting such a configuration, the device according to the present invention has the following operation.
That is, the vibration from the vibrating body side is transmitted to the insulator made of a rubber material or the like via the connection fitting. In contrast, the insulator vibrates or displaces,
Absorbs or blocks most of the input vibration. Therefore, most of the vibration is cut off at the insulator, but some of the vibration is not absorbed and cut off at the insulator, but is transmitted to the vehicle body via the holder or the like. There are cases. Therefore, in the present invention, the vibration of the component (frequency) that could not be absorbed by the insulator portion is transferred to the liquid chambers such as a main chamber and a sub chamber provided below the insulator, and further to the main chamber. On the other hand, absorption or blocking is attempted by the action of a vibrator or the like provided at the third liquid chamber connected via the second orifice. Hereinafter, the specific operation will be described.

First, for idling vibration, a voltage pulse composed of a duty signal of a predetermined frequency is input to a vibrating coil forming the vibrator, and the vibrator is vibrated at a specific frequency. . Thereby, the liquid in the third liquid chamber in which the end face of the vibrator exists is vibrated. The vibration of the liquid in the third liquid chamber is transmitted to the liquid in the main chamber via the second orifice. At this time, according to the present invention, the liquid present in the second orifice has a vibration frequency (frequency) of the vibrator, that is, the vibration frequency (frequency) of the vibration input to the main chamber due to the idling vibration. Thus, the volume in the second orifice is set, and the vibration in the vibrator causes the liquid in the second orifice to resonate. As a result, the exciting force from the vibrator is amplified, and the input wave of the duty signal becomes a sine wave state due to the resonance action and is transmitted to the liquid in the main chamber. That is, the generated force in the vibrator has a small value, and even if it is a pulse wave, the exciting force transmitted to the liquid in the main chamber has a large value and a sine wave. As a result, the increase in the hydraulic pressure in the main chamber caused by the idling vibration propagated into the main chamber is efficiently absorbed, and the dynamic spring constant of the entire engine mount device with respect to the idling vibration is reduced.
By reducing the dynamic spring constant, idling vibration can be cut off efficiently.

[0010] Next, with respect to the vibration cutoff of the engine shake, which is low-frequency vibration, the vibration is suppressed by increasing the damping coefficient, thereby performing the vibration cutoff or vibration damping action. In particular,
In response to the input of the engine shake, the liquid in the main chamber is caused to flow toward the sub-chamber through the first orifice which is easy to flow. As a result, a high damping characteristic (high damping coefficient) is obtained, and low-frequency vibration such as engine shake is suppressed. That is,
The engine shake is shut off.

Next, the invention according to claim 2 will be described. This is also basically the same as the first aspect. The feature is that the vibrator is made of a solenoid type. That is, a connection fitting attached to the vibrating body side, a holder attached to a member or the like on the vehicle body side, an insulator between the connection fitting and the holder for blocking vibration from the vibrating body, and an insulator connected in series to the insulator. A main chamber and a sub-chamber in which an incompressible fluid (liquid) is sealed, a first orifice connecting between the main chamber and the sub-chamber, and a space between the main chamber and the sub-chamber. A partition plate, and an air chamber into which air that is a compressible fluid is introduced,
A diaphragm that partitions between the air chamber and the sub chamber;
A vibrator that is provided on the partition plate and vibrates the liquid on the main chamber side at a specific frequency; and A third liquid chamber (third liquid chamber) is provided on the main chamber side independently of the main chamber, and the liquid in the main chamber is provided between the third liquid chamber and the main chamber. A second orifice (second orifice) formed so as to flow into the third liquid chamber and having a predetermined volume.
Further, the vibrator, a vibrating diaphragm that vibrates the liquid in the third liquid chamber, a movable iron piece that is attached to the vibrating diaphragm and vibrates the vibrating diaphragm, An exciting coil for driving the movable iron piece, and a spring for applying a reaction force to the movable iron piece to oppose the driving force from the exciting coil, the input to the exciting coil having these configurations A configuration is adopted in which the signal is composed of a duty signal.

By adopting such a configuration, the device according to the present invention basically exhibits the same operation as that of the first aspect. In addition, in addition to these, in the present invention, iron pieces are used in place of expensive permanent magnets made of rare earth metal or the like, so that overall cost reduction can be achieved. Will be done. Insufficient output of the vibrator caused by using such an iron piece is compensated for by the resonance effect of the liquid in the second orifice provided above the vibrator. That is, by giving a simple duty signal (pulse signal) as shown in FIG. 4 to the exciting coil, the movable iron piece and the exciting diaphragm are vibrated, and the liquid in the second orifice is resonated based on the vibration. Finally, the liquid in the main chamber is vibrated by a sine wave having a large amplitude. Thus, for example, in response to the input of the idling vibration, the dynamic spring constant of the whole anti-vibration mechanism is reduced, and the idling vibration is cut off.

Next, the third aspect of the present invention will be described. This is also basically the same as the first or second aspect. The feature is that an elastic diaphragm is provided at a lower part of the main chamber and at a partition partitioning between the main chamber and the third liquid chamber. By adopting such a configuration, in the case of the present invention, in addition to the blocking of the idling vibration, the elastic diaphragm portion is also provided for the input of the muffled sound that is a relatively high-frequency vibration. The elastic deformation suppresses a rise in the hydraulic pressure in the main chamber. As a result, the dynamic spring constant of the entire vibration isolator can be suppressed to a low level with respect to the high frequency vibration input regarding the muffled sound. With this low dynamic spring constant, the muffled sound caused by the vibration in the high frequency range can be cut off.

Next, the invention according to claim 4 will be described. This is also basically the same as the first or second aspect. The feature is that the volume of the second orifice connecting the main chamber and the third liquid chamber can be changed. That is, by changing the diameter or the length of the second orifice, the inner volume of the second orifice is changed, thereby changing the mass formed by the liquid filled in the second orifice. What we made possible. As a result, the resonance frequency of the liquid in the second orifice that is vibrated by the vibration of the vibrator becomes variable, and the frequency of the engine idling vibration that changes due to the operation of various accessories can be adjusted as needed. Become like As a result, for example, even when the idling frequency changes due to idle-up or the like, the vibration can be efficiently cut off.

[0013]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described with reference to FIGS. Although related to the embodiment of the present invention, as shown in FIG. 1 and FIG. 3, the configuration is such that a connection fitting 91 connected to a vibrating body such as an engine, a holder 95 connected to a member on the vehicle body side, An insulator 5 made of a rubber-like elastic body or the like is provided between the connection fitting 91 and the holder 95, and a main chamber 6 and a sub-chamber 7 provided in series with the insulator 5 and filled with an incompressible fluid. A first orifice 2 for communicating between the main chamber 6 and the sub-chamber 7; a partition plate 3 for partitioning between the main chamber 6 and the sub-chamber 7; The vibrator 1, 1 ′ provided to face the third liquid chamber 63 connected to the chamber 6, the air chamber 8 into which a compressive fluid such as air is introduced, and the air chamber 8 and the sub chamber 7 A second orifice 62 is provided in the diaphragm 4 that separates the space and the main chamber 6. And a third liquid chamber 63 that is connected to the third liquid chamber 63 through which the liquid is vibrated by the vibrators 1 and 1 ′.

In the transducer having such a basic structure, the transducer (voice coil type) 1 relating to the first embodiment among the transducers mounted on the partition plate 3 is, as shown in FIGS. Yoke 16 fixed on partition plate 3
And a permanent magnet 17 installed in the yoke 16 and a center pole 13 provided on the permanent magnet 17 are formed in an annular shape around the permanent magnet 17, and can be displaced relative to the center pole 13. A vibration coil (voice coil) 11 installed as described above, and a bobbin 15 that houses the vibration coil 11 and vibrates integrally with the vibration coil 11
And a bobbin holder 14 which elastically supports the bobbin 15 on the partition plate 3 and is made of a rubber material or the like.

On the other hand, according to the second embodiment in which the vibrator 1 'is of a solenoid type, the vibrator 1' is mounted on a base 33 provided at the partition plate 3, as shown in FIG. A vibrating coil (solenoid coil) 11 ′, a ring-shaped fixed iron piece 19 provided inside the vibrating coil 11 ′ and installed on the base 33, On the inner diameter side of the fixed iron piece 19, the fixed iron piece 19 and the excitation coil (solenoid coil) 11 ′ can be moved relative to each other, and the fixed iron piece 19 is magnetically interrupted. Movable shaft 125 provided via member 191
And a movable iron piece 121 provided integrally with the movable shaft 125 above the movable shaft 125 and driven by the vibrating coil (solenoid coil) 11 ′. An excitation diaphragm 12 provided on an upper part and an upper part of the movable shaft 125 and facing the third liquid chamber 63, and a lower end part of the movable shaft 125, that is, the excitation diaphragm 12 and a movable iron piece It is provided on the side (lower end) opposite to the side on which 121 is provided, and applies a reaction force to the movable shaft 125 so as to oppose the driving force from the excitation coil (solenoid coil) 11 ′. And a spring 18.

In such a basic structure, the spring 18 is provided as shown in FIGS.
It is based on a leaf spring having a disc-like or ring-like form, and its center is the movable shaft 12.
5 is connected to the lower end portion, and a ring portion of the peripheral portion is fixed to the partition plate 3. Further, members (leaf spring portions) 181 and 188 forming a leaf spring are provided between the central portion and the peripheral edge portion (see FIGS. 5 and 6). 5 is such that the effective length of the leaf spring portion 181 is short, and thus the entire spring constant is non-linear, whereas the one shown in FIG.
The leaf spring portion 188 is long, and therefore, the entire spring constant is linear.

As shown in FIGS. 1 and 3, a third liquid chamber 63 is provided above the vibrators 1, 1 'having such a configuration. . The third liquid chamber 63 is defined by a rigid partition wall 61 so as to cover the upper part of the vibrator 1 and between the main chamber 6 and the third liquid chamber 63. is there. In addition, a second orifice (second orifice) that connects the main chamber 6 and the third liquid chamber 63 in such a manner that the liquid flows therethrough is integrated with the partition 61. An orifice 62 is provided. The volume of the second orifice 62 having such a configuration can be changed (variable) by changing the orifice diameter or the orifice length. Specifically, for example, in FIG. 1 and FIG. 3, the position of the inflow port 621, which is the opening of the second orifice 62 toward the main chamber 6, moves over the second orifice 62 provided in an annular shape. It can be moved arbitrarily. By changing the position of the inflow port 621, the length of the second orifice 62 can be changed. In addition, the movement of the position of the inflow port 621, etc.
By using an existing electromagnetic mechanism or the like, it can be automatically controlled.

As a modified example of this embodiment having the above-described structure, as shown in FIG. 2, a partition wall 61 for partitioning between the main chamber 6 and the third liquid chamber 63 is provided. In this case, an elastic diaphragm 66 made of a rubber material or the like is provided. The main chamber 6 has a frequency of about 100 Hz to 600 H for the muffled sound.
When a high frequency vibration of z is input, the elastic diaphragm 66 is displaced (vibrated) via the liquid in the main chamber 6 so that the liquid pressure in the main chamber 6 is not increased. Is what it is. As a result, the dynamic spring constant of the entire vibration isolator can be suppressed to a low value with respect to a vibration input in a high frequency range. That is, the dynamic spring constant is reduced with respect to vibration in a high frequency range.

Next, the operation and the like of the first embodiment (voice coil type) of this embodiment having such a configuration will be described with reference to FIG. First, with respect to idling vibration, a duty signal of a predetermined frequency is input to a vibrating coil 11 forming the vibrator 1 to vibrate the vibrator 1 at a specific frequency. Thereby, the liquid in the third liquid chamber 63 in which the vibrator 1 is installed is vibrated. Then, the vibration of the liquid in the third liquid chamber 63 is transmitted to the liquid in the main chamber 6 through the second orifice 62. At this time,
In the present embodiment, the second orifice 6
The liquid existing in the second orifice 62 is resonated with the vibration frequency of the vibrator 1, that is, the vibration frequency (frequency) of the vibration input into the main chamber 6 by the idling vibration. Is set. Accordingly, the vibration in the vibrator 1 causes the liquid in the second orifice 62 to resonate, amplifying the exciting force, and propagating the sine wave to the liquid in the main chamber 6. . That is, even if the generated force in the vibrator 1 has a small value, the exciting force transmitted to the liquid in the main chamber 6 has a large value and has a sine wave form. as a result,
Fluctuations in hydraulic pressure in the main chamber 6 caused by idling vibrations propagated in the main chamber 6 are efficiently absorbed, and the dynamic spring constant of the entire engine mount device with respect to the idling vibrations is reduced. By reducing the dynamic spring constant, idling vibration is cut off.

In the present embodiment, the second orifice 62 connecting the main chamber 6 and the third liquid chamber 63 is used to cut off the idling vibration.
However, since its internal volume can be changed, its natural frequency is changed by changing this internal volume. That is, by changing the diameter or length of the second orifice 62,
The inner volume of the second orifice 62 is changed so that the mass formed by the liquid filled in the second orifice 62 can be changed. As a result, the resonance frequency of the liquid in the second orifice 62 that is vibrated by the vibration of the vibrator 1 changes, and the frequency of the engine idling vibration that changes by the operation of various accessories is adjusted as needed. It is what you are doing. As a result, for example, even when the idling frequency changes due to idle-up or the like,
The vibration can be efficiently cut off.

Next, with respect to the vibration cutoff of the engine shake which is a vibration having a lower frequency than the idling vibration, the vibration is suppressed by increasing the damping coefficient.
In this way, the vibration is blocked or the vibration is prevented. For that purpose, through the insulator 5,
It is necessary that the hydraulic pressure in the main chamber 6 be sufficiently increased with respect to the vibration related to the engine shake input into the main chamber 6. Therefore, in this case, in the present embodiment, as shown in FIG. 1, a DC current is applied to the exciting coil 11, and based on the magnetic force between the exciting coil 11 and the permanent magnet 17, the exciting coil 11 and the exciting coil 11 Is fixed so as not to move. As a result, even if low-frequency vibrations related to the engine shake are propagated into the main chamber 6 via the insulator 5, the lower part of the main chamber 6 is located between the third liquid chamber 63. Since the partitioning wall 61 is provided, the volume in the main chamber 6 does not immediately increase in response to the input of the engine shake. As a result, the liquid pressure in the main chamber 6 rises, and the liquid in the main chamber 6 flows toward the sub chamber 7 via the first orifice 2 which is easy to flow. As a result, high damping characteristics (high damping coefficient) can be obtained, and low-frequency vibrations such as engine shake can be suppressed. That is, the engine shake is cut off.

Next, an explanation will be given of the interruption of a muffled sound having a frequency of about 100 Hz to 600 Hz, which is a higher frequency vibration than the idling vibration or the like. That is, in the present embodiment, for example, as shown in FIG. 2, at a lower part in the main chamber 6 and at a partition 61 that partitions the main chamber 6 from the third liquid chamber 63. , The elastic diaphragm 66 is provided,
The high frequency vibration of 100 Hz to 600 Hz is
When the vibration is transmitted into the main chamber 6, the elastic diaphragm 66 elastically deforms in response to the vibration input, thereby suppressing an increase in the hydraulic pressure in the main chamber 6. . As a result, the dynamic spring constant of the entire vibration isolator can be suppressed to a low level with respect to the high frequency vibration input regarding the muffled sound. With this low dynamic spring constant, the muffled sound caused by the vibration in the high frequency range can be cut off.

Also, the second embodiment (solenoid type) as shown in FIG. 3 exhibits basically the same operation as the first embodiment. . However, the liquid resonance action, particularly, the operation of the vibrator 1 'is different, so that they will be described with reference to FIGS. That is, regarding the damping action of the idling vibration, first, a duty signal (pulse signal) as shown in FIG. 4A is input to the excitation coil (solenoid coil) 11 '. As a result, the movable iron piece 121 is excited and driven. However, the movable iron piece 121 is driven by a spring 18 provided at the lower end of a movable shaft 125 integrally connected to the movable iron piece 121. Of the movable iron piece 121 and the movable shaft 1
25 performs the displacement (operation) as shown in FIG. Therefore, the vibration diaphragm 12 connected to the movable iron piece 121 and the movable shaft 125 also undergoes the same displacement or deformation. As a result, the liquid in the third liquid chamber 63 is also subjected to the same vibration.

In the second embodiment, the third liquid chamber 63 is provided with a second orifice 6 communicating with the main chamber 6 in the same manner as in the first embodiment.
The liquid in the second orifice 62 is vibrated (resonates) by the operation of the vibration diaphragm 12, and a large vibration force is applied to the liquid in the main chamber 6. Will be propagated. That is, even if the exciting force by the exciting diaphragm 12 has a small value as shown in FIG. 4B, the exciting force transmitted into the main chamber 6 is the same as that of FIG. ), And has a sine wave form. Therefore, the dynamic spring constant of the whole vibration damping device with respect to the input of the idling vibration is reduced, and the idling vibration is efficiently cut off. In this embodiment, by inputting a simple pulse signal to the excitation coil 11 ', it is possible to efficiently absorb and cut off idling vibration.

[0025]

According to the present invention, an insulator for intercepting vibration from a vibrating body is provided between a connecting fitting mounted on a vibrating body side and a holder mounted on a member or the like on a vehicle body side.
A main chamber and a sub-chamber provided in series with the insulator and filled with an incompressible fluid (liquid); a first orifice connecting between the main chamber and the sub-chamber; A liquid-filled vibration isolator comprising a vibrator or the like that vibrates so that the liquid on the liquid side resonates at a specific frequency, a third above the vibrator independently and independently of the main chamber. A liquid chamber (third liquid chamber) is provided, and a liquid is formed between the third liquid chamber and the main chamber so that the liquid in the main chamber flows into the third liquid chamber. Since a second orifice (second orifice) having a volume of about 2 mm is provided, the exciting force generated from the vibrator is resonated in the second orifice. Can be propagated into the main room , It has become possible to vibrate the main chamber of the liquid at a small output of the oscillator at large force. Further, a sine wave can be obtained only with a simple duty signal generator without using an expensive AC current generator or the like. As a result, it has become possible to efficiently cut off various vibrations including idling vibrations using a small and inexpensive vibrator.

Further, the vibrator includes an exciting coil, a movable iron piece,
In the solenoid type formed by a spring and a spring, idling vibration can be efficiently cut off by inputting a simple pulse signal to the excitation coil. As a result, there is no need to use expensive permanent magnets or the like made of a rare earth metal or the like, and the manufacturing cost can be reduced. Further, since the exciting coil is not a movable type but a fixed type, the mounting structure of harnesses (electric wires) for inputting signals to the exciting coil has been simplified. As a result, the assembling work can be simplified and the manufacturing cost can be reduced.

Further, the second orifice can be adjusted in diameter or length so that the volume in the second orifice can be changed, and the second orifice is formed by the liquid in the second orifice. The proper natural frequency can be adjusted appropriately. As a result, even when the frequency of the idling vibration changes, it is possible to cope with this at any time, and the idling vibration and the like can be cut off efficiently.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view showing an overall configuration of a device according to a first embodiment of the present invention.

FIG. 2 is a longitudinal sectional view showing a modified example of a configuration around a main chamber and a third liquid chamber according to the present invention.

FIG. 3 is a longitudinal sectional view showing an overall configuration of a second embodiment of the present invention.

FIG. 4 is a diagram showing an operation state (function) of a device according to a second embodiment of the present invention.

FIG. 5 is a plan view showing an overall configuration of a spring having a non-linear spring constant among springs used in a second embodiment of the present invention.

FIG. 6 is a plan view showing an overall configuration of a spring having a linear spring constant among springs used in a second embodiment of the present invention.

FIG. 7 is a longitudinal sectional view showing the entire configuration of a conventional example.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Oscillator 1 'Oscillator 11 Exciting coil (voice coil) 11' Exciting coil (solenoid coil) 12 Exciting diaphragm 121 Movable iron piece 125 Movable shaft 13 Center pole 14 Bobbin holder 15 Bobbin 16 Yoke 17 Permanent magnet 18 Spring 19 Fixed Iron piece 191 Magnetic shielding member 2 First orifice 3 Partition plate 33 Base 4 Diaphragm 5 Insulator 6 Main chamber 61 Partition wall 62 Second orifice 621 Inflow port 63 Third liquid chamber 66 Elastic diaphragm 7 Sub chamber 8 Air chamber 91 Connecting fitting 95 Holder

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Tetsuya Tsugi 1 Nagahata Ochiai, Kasuga-machi, Nishi-Kasugai-gun, Aichi Prefecture Inside Toyoda Gosei Co., Ltd. No. 1 Toyoda Gosei Co., Ltd. (72) Inventor Tetsuo Asano 1, Nagahata, Ochiai, Kasuga-cho, Nishikasugai-gun, Aichi Prefecture

Claims (4)

[Claims] 1. A connecting member attached to a vibrating body, a holder attached to a member or the like on a vehicle body, an insulator interposed between the connecting member and the holder, for isolating vibration from the vibrating body, and an insulator for the insulator. A main chamber and a sub-chamber provided in series with each other and filled with an incompressible fluid (liquid); a first orifice connecting between the main chamber and the sub-chamber; And a partition plate that separates the air chamber into which air that is a compressible fluid is introduced,
A diaphragm that partitions between the air chamber and the sub chamber;
An electromagnetic vibrator, which is provided on the partition plate and vibrates so as to resonate the liquid in the main chamber at a specific frequency, and a liquid-filled vibration isolator comprising: A third liquid chamber (third liquid chamber) is provided on the upper part of the vibrator and on the side of the main chamber independently of the main chamber, and between the third liquid chamber and the main chamber. A second orifice (second orifice) formed so that the liquid in the main chamber flows into the third liquid chamber and having a predetermined volume; Wherein the input signal to the electromagnetic vibrator comprises a duty signal. 2. The liquid-filled vibration damping device according to claim 1, wherein the vibrator is attached to the vibration diaphragm for vibrating the liquid in the third liquid chamber, and the vibration is attached to the vibration diaphragm. A movable iron piece that vibrates the diaphragm, a vibration coil that drives the movable iron piece, and a spring that applies a reaction force to the movable iron piece that opposes the driving force from the vibration coil. A liquid filled type vibration damping device characterized by the following. 3. The liquid-filled type vibration damping device according to claim 1, wherein a vibration of a specific frequency is applied to the liquid in the main chamber at a partition partitioning between the main chamber and the third liquid chamber. A liquid-sealed vibration isolator, wherein an elastic diaphragm is provided which operates so as to suppress a rise in liquid pressure of the liquid in the main chamber when is propagated. 4. The liquid-filled type vibration damping device according to claim 1, wherein the second orifice connecting the main chamber and the third liquid chamber has at least one of a diameter and a length. A liquid-filled type vibration damping device characterized in that one of the two orifices is formed so as to be changeable, whereby the volume of the second orifice is changeable.