JP3511124B2 - Liquid filled type vibration damping device - Google Patents

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 capable of obtaining a vibration damping effect based on the flow of a fluid (liquid) sealed inside, and in particular,
A liquid-filled type vibration damping device in which vibration damping characteristics that are exhibited along with the flow of liquid can be switched to multiple stages by a vibration mechanism part with a simple structure driven by engine suction negative pressure. It is about.

[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. Since it is used, it must be able to handle a wide range of frequencies. In addition, recently, engine mounts have been tuned for the purpose of blocking muffled noise caused by vibration in a relatively high frequency range. 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 Utility Model Publication No. 4-39481. However, these known devices have a complicated structure such that a plurality of liquid chambers are provided and a vibrator that vibrates at a specific frequency is provided in the liquid chambers. . In addition, these known devices have many parts such as a vibration coil and a permanent magnet, and therefore have a problem that they are inevitably heavy as a vibration isolator as a whole. In order to solve such a problem, an oscillating device having a simple mechanism driven by the suction negative pressure of the engine is provided, so that various vibrations including idling vibration can be cut off. The present invention has already been filed by the present applicant (see Japanese Patent Application No. 8-287524).

[0003]

By the way, as shown in, for example, FIG. 7, the vibration-damping mechanism portion 10 of this one is installed in the insulator 20 and the main chamber 110 via the diaphragm 150 and the equilibrium chamber 130. It is designed to be formed on the basis of the above. Then, the engine suction negative pressure or the atmospheric pressure is introduced into the equilibrium chamber 130 by the switching means 30 which performs a switching operation based on the control action of the control means 50. With such a configuration, for example, when shutting off vibration during engine idling, the switching valve 310 forming the switching means 30 is opened / closed according to the frequency of engine idling, whereby the engine The negative suction pressure and the atmospheric pressure are alternately introduced into the equilibrium chamber 130. By the way, when introducing this negative pressure and atmospheric pressure,
When the switching valve 310 is opened / closed at a predetermined cycle (frequency), the pressure fluctuation in the equilibrium chamber 130 at that time, that is, the fluctuation state of the exciting force is as follows: when the negative pressure is introduced and when the atmospheric pressure is introduced. However, since the conditions are different, a regular sine wave is not obtained and a complicated waveform is exhibited. In order to correct the portion deviated from the regular sine wave, for example, a third liquid chamber (third liquid chamber) is provided between the equilibrium chamber 130 and the main chamber 110, and the third liquid chamber is also provided. A second orifice in which a liquid flows is provided between the main chamber and the main chamber (see Japanese Patent Application No. 8-355127). However,
Even in this case, it may still be insufficient.
In order to improve such an inadequate point, the liquid-filled type protective device in which the vibration force formed by the vibration device exhibits a regular sine wave when the negative pressure is introduced and the atmospheric pressure is introduced. It is an object (problem) of the present invention to provide a vibration device.
Is.

[0004]

In order to solve the above-mentioned problems, the following measures are taken in the present invention. That is, in the first aspect of the invention, the upper connecting member attached to the vibrating body, the lower connecting member attached to a member on the vehicle body side, and the vibrating body located between the upper connecting member and the lower connecting member. That absorbs and blocks the vibration of the, the main chamber in which the chamber wall is formed by a part of the insulator, and the liquid is sealed, and the first orifice (first orifice) in the main chamber. And a sub chamber having the first diaphragm (first diaphragm) as a part of its chamber wall and the main chamber through a second orifice (second orifice). At the same time, a third liquid chamber (third liquid chamber) formed to introduce the liquid in the main chamber, and a third liquid chamber having a higher deformation rigidity than the first diaphragm with respect to the third liquid chamber. Second And an equilibrium chamber formed so that either one of the atmospheric pressure and the negative pressure is introduced. In the equilibrium chamber configured as described above, there is a switching means for performing a switching operation so as to alternately introduce one of negative pressure and atmospheric pressure in a state of being synchronized with engine vibration, and further, Regarding a negative pressure introduction type liquid filled type vibration damping device having a control means for controlling the switching operation of the switching means, which is connected to the main chamber via a third orifice,
A fourth liquid chamber (fourth liquid chamber) formed independently of each of the liquid chambers is provided, and one surface side is in contact with the liquid in the fourth liquid chamber and the other surface side is the sub liquid chamber. The configuration is such that a third diaphragm (third diaphragm) formed so as to contact the liquid on the chamber side is provided.

By adopting such a structure, the present invention has the following effects.
That is, with respect to idling vibration, by operating the switching means, negative pressure or atmospheric pressure is alternately introduced into the equilibrium chamber at a specific frequency. That is, by operating the switching means at a specific frequency, the pressure (volume) in the equilibrium chamber is changed, and thereby the fluid pressure fluctuation in the main chamber caused by the idling vibration input via the insulator. To absorb. As a result, the dynamic spring constant of the spring system formed by the insulator and the vibrating mechanism section is reduced.

Particularly, in this case, in the present invention, the third liquid chamber, which is subjected to pressure fluctuation due to the operation of the second diaphragm, and the main chamber are connected by the second orifice having a predetermined volume. The liquid in the second orifice resonates with the liquid pressure fluctuation of the liquid in the main chamber due to the operation of the equilibrium chamber, that is, the operation of the second diaphragm. Therefore, the change state of the generated force (vibration energy) formed in the entire vibration mechanism part is close to an ideal sine wave. Further, in the present invention, a fourth liquid chamber is provided via a third orifice connected to the main chamber, and the fourth liquid chamber has
Since the third diaphragm whose other surface (lower surface side) is in contact with the liquid in the sub chamber is provided, the action of the third orifice and the third diaphragm causes the operation of the second diaphragm during operation. Higher order caused by deviation of excitation force from normal sine wave, and
The high frequency noise component is removed (see FIG. 6). As a result, the generated force (vibration energy) is infinitely close to a sine wave (see FIG. 5), and the idling vibration is accurately absorbed and blocked. Therefore, it is possible to avoid the occurrence of high frequency vibration that may occur in connection with the cutoff of the idling vibration.

On the other hand, with respect to the vibration of the engine shake which is a problem when the vehicle is running, the switching means is operated to open the equilibrium chamber to the atmosphere. That is, the second diaphragm is free. When vibration related to the engine shake is input into the main chamber in such a state, in response to this, fluctuations in hydraulic pressure in the main chamber are also transmitted to the second diaphragm via the second orifice and the third liquid chamber. It may be propagated. However, the deformation area of the second diaphragm itself is narrowed due to the presence of the protruding stopper portion provided at the central portion of the second diaphragm, which makes it difficult to deform (displace) as a whole. There is. Therefore, the liquid in the main chamber flows through the first orifice to the side of the sub chamber where the chamber wall is formed by the easily deformable first diaphragm. Due to the flow motion of the liquid toward the first orifice side, high damping characteristics (high damping force) in the present vibration damping device can be obtained. The engine damping is suppressed by the high damping force.

Next, the invention according to claim 2 will be described. The basic point of this is also the same as that of the above-mentioned claim 1. And, the feature thereof is that the third diaphragm is connected to the main chamber via a third orifice, and the second liquid chamber is provided independently of the equilibrium chamber and the like. The second air chamber and the second air chamber are provided so as to partition the two chambers. That is, an upper connecting member attached to the vibrating body, a lower connecting member attached to a member or the like on the vehicle body side, and an insulator between the upper connecting member and the lower connecting member for absorbing and blocking vibration from the vibrating body. , A chamber wall of which is formed in a part of the insulator, and is connected to the main chamber in which liquid is sealed via the first orifice (first orifice), and One diaphragm (first diaphragm)
Is connected to a sub-chamber, which is a part of the chamber wall, to the main chamber via a second orifice (second orifice), and is formed to introduce the liquid in the main chamber. The third liquid chamber (third liquid chamber) and a second diaphragm (second diaphragm) having a higher deformation rigidity than the first diaphragm are partitioned from the third liquid chamber. Of the atmospheric pressure and the negative pressure, an equilibrium chamber formed so that either one of the negative pressure and the negative pressure is introduced into the equilibrium chamber having such a configuration. , Negative pressure introduction having switching means for performing switching operation so that either one of them is introduced alternately in a state of being synchronized with engine vibration, and further having control means for controlling the switching operation of the switching means. Type liquid-filled anti-vibration device, A fourth liquid chamber (fourth liquid chamber), which is connected to the main chamber via a third orifice and is formed independently of each of the liquid chambers, is provided. A third diaphragm (one surface side of which is in contact with the liquid in the chamber, the other surface side of which is formed so as to be in contact with the air of a second air chamber (second air chamber) independently provided ( It was decided to adopt a configuration in which a third diaphragm) was provided.

By adopting such a configuration, in the present invention, like the first aspect, by appropriately operating the switching means, various vibrations including idling vibration can be cut off. Will be done. In particular, in the present invention, at the fourth liquid chamber provided so as to communicate with the main chamber through the third orifice, the other surface (lower surface side) is provided independently. Since the third diaphragm formed so as to come into contact with the air in the two air chambers is provided,
Due to the elastic deformation (vibration) of the second diaphragm based on the compressive deformation of the air sealed in the air chamber, the high-order and high-frequency noise component (vibration) formed by the portion deviated from the sine wave is generated. Will be removed (see FIG. 6). That is, the exciting force propagated to the liquid in the main chamber by the present vibrating mechanism section is in the state of almost a sine wave (see FIG. 5). Therefore, vibrations of high frequency components that may occur in connection with the cutoff of idling vibrations are completely removed.

Next, the invention according to claim 3 will be described. Also in this case, the basic point is the same as that of the above-mentioned claim 1 or claim 2. The feature is that in the liquid-filled type vibration damping device according to claim 1 or 2, the third orifice connecting the fourth liquid chamber and the main chamber is provided with the main chamber and the third chamber. It is arranged to be provided at the central portion of the partition wall that separates the liquid chamber and the central portion of the second diaphragm, and at the stopper portion that is formed to regulate the displacement of the second diaphragm. It is decided to adopt the configuration. By adopting such a configuration, in the present invention,
As in the above-mentioned claim 1 and claim 2,
In addition to blocking various vibrations such as idling vibration, the liquid-filled type vibration damping device with such various functions will be compacted as a whole, and the overall size and weight of the device will be reduced. Will be realized.

[0011]

BEST MODE FOR CARRYING OUT THE INVENTION An embodiment of the present invention will be described with reference to FIGS. Although it relates to the first embodiment (first embodiment) of the present invention, its configuration is as shown in FIG.
As shown in FIG. 2, an upper connecting member 6 attached to the vibrating body, a lower connecting member 9 attached to a member on the vehicle body side, and the vibrating body between the upper connecting member 6 and the lower connecting member 9. 2 that absorbs and blocks the vibration of the liquid, and a liquid chamber that is provided in series with the insulator 2 and that is formed by a main chamber 12 and a sub chamber 16 in which a liquid that is an incompressible fluid is sealed The vibration-isolating mechanism portion 1 and the like, which forms a part of the vibration-isolating mechanism portion 1, and is equilibrium chamber 13 that is partitioned and formed between the third liquid chamber 123 and the second diaphragm 11. Of the negative pressure and the atmospheric pressure into the equilibrium chamber 13 so as to alternately introduce one of the negative pressure and the atmospheric pressure in a state of being synchronized with the engine vibration. Control switching operation A control unit 5, in which the basic in that it consists of.

In such a basic structure, the insulator 2 is made of a rubber-like elastic body such as a vibration-proof rubber material, and one end surface of the insulator 2 is integrated with the upper connecting member 6 by vulcanizing bonding means or the like. It is designed to be combined with each other. The vibration isolating mechanism portion 1 provided in series with such an insulator 2 is provided below the insulator 2 in succession to the insulator 2 and has a main chamber 12 in which a liquid is sealed. When,
A third liquid chamber 123 connected to the main chamber 12 via a second orifice 125 and formed so that the liquid in the main chamber 12 is introduced, and a third liquid chamber 123 The two main diaphragms are partitioned by the two diaphragms 11 and are provided to the main chamber 12 through a partition plate 14 and a balance chamber 13 into which negative pressure or atmospheric pressure is introduced. Similar to 12, sub-chamber 1 in which liquid is sealed
6, a first orifice 15 for connecting between the main chamber 12 and the sub chamber 16, and a first diaphragm 17 provided below the sub chamber 16 via a first diaphragm 17 to constantly introduce the atmosphere. The air chamber 18 and the respective liquid chambers are provided independently of each other, and the fourth liquid chamber 74 connected to the main chamber 12 via the third orifice 75 and the inside of the fourth liquid chamber 74 A third diaphragm (third diaphragm) formed so that one surface side thereof comes into contact with the liquid and the other surface side thereof comes into contact with the liquid in the sub chamber 16 through a rigid screen 71 therebetween. It is basically composed of 73 and.

The structure of the vibrating mechanism part around the second diaphragm 11 and the hydraulic pressure absorbing mechanism part around the third diaphragm 73 forming the vibration isolating mechanism part 1 having such a structure will be described. First, the second diaphragm 11 forming the vibrating mechanism portion is connected to the main chamber 12 by the third liquid chamber 123.
And the equilibrium chamber 13 into which negative pressure or atmospheric pressure is introduced. That is, on the one surface side (upper surface side), the liquid in the main chamber 12 is introduced through the second orifice 125 having a predetermined volume, and the fluctuation in the hydraulic pressure in the main chamber 12 is constantly maintained. The third liquid chamber 123 formed so as to propagate is provided. The other surface side (lower surface side) is provided with an equilibrium chamber 13 into which negative pressure or atmospheric pressure is introduced based on the operation of the switching means 3. Further, the present second diaphragm 11 having such a structure is configured such that the entire deformation rigidity thereof is higher than that of the first diaphragm 17 which partitions the sub chamber 16 and the air chamber 18. is there. Specifically, as shown in FIGS. 1 and 2, a raised stopper portion 111 is provided near the central portion and on both upper and lower sides thereof. Then, the tip end portions of the upper and lower stopper portions 111 come into contact with the partition wall partitioning the main chamber 12 and the third liquid chamber 123 and a part of the partition plate 14 forming the lower surface portion of the equilibrium chamber 13. It is designed to do. That is, a higher spring constant is set so that it is less likely to be deformed (displaced) than the first diaphragm 17 with respect to fluctuations in the hydraulic pressure in the main chamber 12. However, the equilibrium chamber 13
When a negative pressure is introduced into the cylinder, the spring constant (deformation rigidity) is limited to the extent that the negative pressure force can be sucked (displaced).

The second orifice 125 connecting the main chamber 12 and the third liquid chamber 123 having the above-mentioned structure.
In the present embodiment, the orifice diameter is smaller than that of the first orifice 15 connecting the main chamber 12 and the sub chamber 16 with each other. is there. That is, the liquid in the main chamber 12 is more likely to flow to the first orifice 15 side than the main second orifice 125.

Next, the third diaphragm 73 forming the hydraulic pressure absorption mechanism portion communicates with the main chamber 12 and the fourth liquid chamber 74.
And a sub chamber 16 communicating with the main chamber 12 through the first orifice 15. That is, the liquid in the main chamber 12 is introduced to the one surface side (upper surface side) through the third orifice 75, and the fluid pressure fluctuation in the main chamber 12 is propagated. The fourth liquid chamber 74 is provided. On the other surface side (lower surface side), the sub chamber 1 connected to the main chamber 12 via the first orifice 15.
6 is provided, and the sub chamber 1
The hydraulic pressure in 6 is propagated through a rigid screen 71 having a plurality of openings. That is, the third diaphragm 73 is the main chamber 1
The displacement (vibration) is made according to the difference (differential pressure) between the hydraulic pressure on the second side and the hydraulic pressure on the sub chamber 16 side.
In addition, since the rigid screen 71 is provided on the lower portion of the third diaphragm 73, the third diaphragm 73 is not significantly deformed (displaced) toward the sub chamber 16 side. Therefore, it does not interfere with the first diaphragm 17 or the like.

A modified example shown in FIG. 2 can be cited as the hydraulic pressure absorption mechanism portion formed by the third diaphragm 73, the fourth liquid chamber 74 and the like. In this device, a third orifice 75 for introducing the liquid in the main chamber 12 into the fourth liquid chamber 74 is provided at the stopper portion 111 formed in the central portion of the second diaphragm 11. It is designed to be provided. By adopting such a configuration, the third orifice 75
Centered on the third diaphragm 73 and the fourth liquid chamber 74
The surrounding structure can be compactly integrated, and the overall size and weight of the device can be reduced.

Next, the switching means 3 which operates so as to introduce the negative pressure or the atmospheric pressure into the equilibrium chamber 13 having such a configuration in a state where the negative pressure or the atmospheric pressure is appropriately switched is a switching valve 31 including a three-way valve or the like. And a solenoid 32 for driving the switching valve 31. An adjusting throttle valve 33 for balancing the introduction speed of the atmospheric pressure with the introduction speed of the negative pressure is provided on the atmospheric pressure introduction port side of the switching valve 31 having such a configuration. There is. A resonance tank 35 having a predetermined capacity is provided on the negative pressure introduction side. By providing such a resonance tank 35, when the distance from the negative pressure source formed by the engine suction negative pressure or the like to the equilibrium chamber 13 (pipe distance) becomes long, the resistance in the pipe, etc. This is intended to prevent the negative pressure supplied to the equilibrium chamber 13 from decreasing due to the above.
That is, by providing such a resonance tank 35, a predetermined amount of negative pressure is always supplied accurately in the equilibrium chamber 13 in a predetermined cycle, whereby the second diaphragm 11 is supplied. It vibrates with a large amplitude value.

Next, the switching means 3 having such a structure.
The control means 5 for controlling the switching operation of is composed of a microcomputer or the like formed on the basis of arithmetic means such as a microprocessor unit (MPU), detects vibration from a vibrating body such as an engine, and The switching operation of the switching means 3 is controlled according to the vibration.

Next, the operation and the like of the present embodiment having such a configuration will be described. First, with respect to idling vibration, by operating the switching means 3, negative pressure or atmospheric pressure is alternately introduced into the equilibrium chamber 13 at a specific frequency. That is, the pressure (volume) in the equilibrium chamber 13 is changed by operating the switching means 3 at a specific frequency, whereby the insulator 2
The hydraulic pressure fluctuation in the main chamber 12 caused by the idling vibration input via the is absorbed. As a result, the dynamic spring constant of the spring system formed by the insulator 2 and the main vibration mechanism section is reduced.

In this case, in particular, in the present embodiment, as shown in FIGS. 1 and 2, the third liquid chamber 123 is subject to pressure fluctuation due to the operation of the second diaphragm 11.
The main chamber 12 and the main chamber 12 are connected by a second orifice 125 having a predetermined volume, and the liquid in the second orifice 125 operates in the equilibrium chamber 13, that is, By the operation of the two diaphragms 11,
It resonates with the fluctuation of the liquid pressure of the liquid in the main chamber 12. Therefore, the change state of the generated force (vibration energy) formed in the present vibration mechanism part is close to an ideal sine wave. Further, in the present embodiment, the fourth liquid chamber 74 is provided via the third orifice 75 connected to the main chamber 12, and at the fourth liquid chamber 74, Since a third diaphragm 73 whose other surface (lower surface side) is in contact with the liquid in the sub chamber 16 is provided, the liquid formed by the third orifice 75, the third diaphragm 73, etc. Due to the action of the pressure absorbing mechanism, when the second diaphragm 11 is activated, as shown in FIG.
The part deviating from the normal sine wave as shown by the solid line in FIG. In other words, the generated force (vibration energy) formed by these vibrating mechanism parts and the like becomes infinitely close to a sine wave, and the idling vibration is absorbed and blocked accurately. Therefore, a high-order and high-frequency noise component (vibration) that may occur in connection with the cutoff of the idling vibration is removed, and the dynamic spring constant in the high frequency range is shown as shown by the broken line in FIG. (Kd) is also controlled to a low value.

On the other hand, with respect to the vibration of the engine shake which is a problem when the vehicle is running, the switching means 3 is operated to open the equilibrium chamber 13 to the atmosphere. That is, the second diaphragm 11 is brought into a free state. In such a state, when a vibration related to the engine shake is input into the main chamber 12, the main chamber 12 is responded accordingly.
The hydraulic pressure fluctuation inside may be propagated to the second diaphragm 11 via the second orifice 125 and the third liquid chamber 123. However, the present second diaphragm 11 itself is difficult to be deformed (displaced) as a whole because the deformed region is narrowed due to the presence of the protruding stopper portion 111 provided at the central portion thereof. It is like this. Therefore, the liquid in the main chamber 12 is
Through the first orifice 15, the easily deformable first diaphragm 17 flows toward the sub chamber 16 side where the chamber wall is formed. Due to the flow motion of the liquid to the first orifice 15 side, the high damping characteristic (high damping force) of the vibration isolator can be obtained. This high damping force suppresses the vibration related to the engine shake.

Next, a second embodiment (second embodiment) of the present invention will be described with reference to FIGS. 3 and 4. The basic point of this device is also the same as that of the first embodiment. The feature is the configuration around the third diaphragm 73. That is, although the structure around the third diaphragm 73 according to the present embodiment is as shown in FIGS. 3 and 4, the third diaphragm 73 and the second diaphragm 11 are integrally formed of a rubber material or the like. It is designed to be formed. Specifically, for example, the one shown in FIG. 3 includes a second diaphragm 11 that forms a partition between the third liquid chamber 123 and the equilibrium chamber 13,
A fourth diaphragm 73 and a third diaphragm 73 partitioning the second air chamber 72 are arranged in parallel, and they are integrated via a weir 19 which also serves as a stopper. It is intended to be provided. Further, a fourth liquid chamber 74 into which the liquid in the main chamber 12 is introduced via the third orifice 75 is provided above the third diaphragm 73 having such a configuration. Together with this third diaphragm 73
A second air chamber 72, which is an independent air chamber, is provided below the partition plate 14 in the lower part of the. As described above, in the present embodiment, the third diaphragm 7 forming the hydraulic pressure absorption mechanism portion is formed.
An independent air chamber (second air chamber) 72 in which air is enclosed is provided in the lower part of 3, and the whole is formed with a simple structure. .

In the present embodiment having such a structure, as in the case of the first embodiment, the third orifice 75 is located at the center of the second diaphragm 11. Then, there is a modified example in which it is provided at the stopper portion 111 having a raised shape (see FIG. 4). Specifically, as shown in FIG. 4, this is located at the central portion of the partition wall 124 that partitions the main chamber 12 and the third liquid chamber 123 and the partition wall 124.
A concave third orifice 75 is provided at the stopper portion 111 in contact with the central portion of the third diaphragm 73, and a third diaphragm 73 is provided at the lower surface portion of the third orifice 75. 11
And the stopper portion 111 is formed integrally with the stopper portion 111. Further, at the lower portion of the third diaphragm 73 having such a configuration, that is, at the partition plate 14 forming the lower surface portion of the equilibrium chamber 13, the second air having an independent space portion is formed. The chamber (second air chamber) 72 is formed. As described above, the third orifice 75, the third diaphragm 73, and the second air chamber 72 are compactly and collectively installed at the central portions of the partition wall 124 and the second diaphragm 11, thereby reducing the size of the entire apparatus. Is designed.

[0024]

According to the present invention, in the liquid-filled type vibration damping device, the third liquid chamber into which the liquid in the main chamber is introduced via the second orifice, and the liquid in the third liquid chamber is sucked into the engine suction negative. In addition to the vibration mechanism that consists of the second diaphragm and the equilibrium chamber that are vibrated by pressure, it is provided separately from these and consists of a third orifice, a fourth liquid chamber, a third diaphragm, etc. Since the hydraulic pressure absorption mechanism section is provided, the fluctuation state of the vibration force that is propagated to the liquid in the main chamber formed by these vibration mechanism sections, etc., should be as close as possible to a sine wave. Is now possible. as a result,
It has become possible to accurately cut off various vibrations such as idling vibration. Further, when the vibration mechanism is vibrated for the purpose of shutting off idling vibration, high-order and high-frequency noise components that may have been generated in the past can be accurately removed. Even in the high frequency range, it becomes possible to reduce the dynamic spring constant of the entire anti-vibration device.

[Brief description of drawings]

FIG. 1 is a vertical cross-sectional view showing the overall structure of a first embodiment of the present invention.

FIG. 2 is a vertical cross-sectional view showing the overall configuration of a modification of the first embodiment of the present invention.

FIG. 3 is a vertical cross-sectional view showing the overall structure of a second embodiment of the present invention.

FIG. 4 is a vertical cross-sectional view showing an overall configuration of a modified example of the second embodiment of the present invention.

FIG. 5 is a diagram showing a state (waveform) of an exciting force generated by an exciting mechanism section according to the present invention.

FIG. 6 is a dynamic spring constant (K
It is a figure which shows the change state of d).

FIG. 7 is a vertical cross-sectional view showing the overall configuration of a conventional example.

[Explanation of symbols]

1 Vibration isolation mechanism 11 Second diaphragm (second diaphragm) 111 Stopper 12 Main room 123 Third liquid chamber (third liquid chamber) 124 partition 125 Second Orifice (Second Orifice) 13 Equilibrium chamber 14 partition boards 15 First Orifice (First Orifice) 16 Sub-room 17 1st diaphragm (1st diaphragm) 18 air chamber 19 weir 2 insulators 3 switching means 31 Switching valve 32 solenoid 33 Throttle valve 35 Resonant tank 5 Control means 6 Upper connecting member 71 screen 72 Second air chamber (second air chamber) 73 Third Diaphragm (Third Diaphragm) 74 Fourth Liquid Chamber (Fourth Liquid Chamber) 75 Third Orifice (Third Orifice) 9 Lower connection member

─────────────────────────────────────────────────── ─── Continuation of the front page (56) Reference JP 10-38018 (JP, A) JP 10-159892 (JP, A) (58) Fields investigated (Int.Cl. ⁷ , DB name) F16F 13/26

Claims (3)

(57) [Claims] 1. An upper connecting member attached to a vibrating body,
A lower connecting member attached to a member or the like on the vehicle body side, an insulator between the upper connecting member and the lower connecting member that absorbs and blocks vibrations from the vibrating body, and a chamber wall of a part of the insulator. The main chamber that is formed and is filled with liquid is connected to the main chamber through a first orifice (first orifice), and the first diaphragm (first diaphragm) is connected to the chamber. A third liquid chamber that is connected to the sub chamber that is a part of the wall and the main chamber through a second orifice (second orifice), and that is configured to introduce the liquid in the main chamber. (Third liquid chamber) and a second diaphragm (second diaphragm) having a deformation rigidity higher than that of the first diaphragm with respect to the third liquid chamber. And negative Of the equilibrium chamber either those one of which is formed to be introduced, together consisting of
In the equilibrium chamber having such a configuration, there is a switching means for performing a switching operation so as to alternately introduce one of negative pressure and atmospheric pressure in a state of being synchronized with engine vibration. Is a negative pressure introduction type liquid filled type vibration damping device having a control means for controlling the switching operation of the switching means, which is connected to the main chamber via a third orifice. A fourth liquid chamber (fourth liquid chamber) formed independently of the chamber is provided, and one surface side is in contact with the liquid in the fourth liquid chamber, and the other surface side is the sub chamber side. A liquid-filled vibration damping device, characterized in that a third diaphragm (third diaphragm) in contact with the liquid is provided. 2. An upper connecting member attached to the vibrating body,
A lower connecting member attached to a member or the like on the vehicle body side, an insulator between the upper connecting member and the lower connecting member that absorbs and blocks vibrations from the vibrating body, and a chamber wall of a part of the insulator. The main chamber that is formed and is filled with liquid is connected to the main chamber through a first orifice (first orifice), and the first diaphragm (first diaphragm) is connected to the chamber. A third liquid chamber that is connected to the sub chamber that is a part of the wall and the main chamber through a second orifice (second orifice), and that is configured to introduce the liquid in the main chamber. (Third liquid chamber) and a second diaphragm (second diaphragm) having a deformation rigidity higher than that of the first diaphragm with respect to the third liquid chamber. And negative Of the equilibrium chamber either those one of which is formed to be introduced, together consisting of
In the equilibrium chamber having such a configuration, there is a switching means for performing a switching operation so as to alternately introduce one of negative pressure and atmospheric pressure in a state of being synchronized with engine vibration. Is a negative pressure introduction type liquid filled type vibration damping device having a control means for controlling the switching operation of the switching means, which is connected to the main chamber via a third orifice. A fourth liquid chamber (fourth liquid chamber) formed independently of the chamber is provided, and one surface side is in contact with the liquid in the fourth liquid chamber, and the other surface side is independently formed. A liquid-filled type vibration damping device, characterized in that a third diaphragm (third diaphragm) in contact with the air in the air chamber (second air chamber) provided is provided. 3. The liquid-filled type vibration damping device according to claim 1 or 2, wherein the third orifice connecting the fourth liquid chamber and the main chamber is connected to the main chamber and the third liquid chamber. It is characterized in that it is provided at the central portion of the partition wall that separates the spaces and the central portion of the second diaphragm, and at the stopper portion that is formed to regulate the displacement of the second diaphragm. Liquid-filled anti-vibration device.