JPH10196709A - Fluid filled vibration control equipment - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain the damping function of a fluid chamber effectively by connecting two or more mass members each other with elastic plates, and having the mass members elastically supported by mounting members, in equipment which controls its damping characteristic by exciting a moving member constituting a part of walls of the fluid chamber filled with incompressible fluid. SOLUTION: The inside of a fluid chamber 36 formed between a first mounting piece 12 and a moving member 34 is divided into a main fluid chamber 53 formed by first and second dividing members 46, 50 and first and second fluid subchambers 48, 52, whose wall is partly formed by the moving member 34. Then, an area on the moving member 34 where the wall of the first fluid subchamber 48 is formed, is elastically connected to a second mass fitment 44 while connecting a first mass fitment 42 to the second mass fitment 44 using a first elastic connecting part 54 of an elastic rubber plate 40, to constitute a first vibration system 55. Further, an area on the moving member 34 where the wall of the second fluid subchamber 52 is formed, is elastically connected to a second mounting piece 14 while connecting the second mass fitment 44 provided with the first dividing member 46 to the second mounting piece 14 using a second elastic connecting part 56 of the elastic rubber plate 40, to constitute a second vibration system 57.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention has a fluid chamber in which an incompressible fluid is sealed, and a method for appropriately adjusting vibration damping characteristics by controlling an internal pressure in the fluid chamber and a fluid flow accompanying a change in the internal pressure. The present invention relates to a fluid-filled vibration isolator that can be used.

[0002]

2. Description of the Related Art Japanese Patent Application Laid-Open Nos. 60-8540 and 61-61 discloses a type of vibration isolating device as a vibration isolating connection member or a vibration isolating support member interposed between members constituting a vibration transmission system. 293
As described in Japanese Patent Application Publication No. 9-205, etc., a first mounting member and a second mounting member which are separated from each other are connected by a main rubber elastic body, while the first mounting member and the second mounting member are connected to each other. A main liquid chamber in which an incompressible fluid is sealed, in which an internal pressure fluctuation is caused by deformation of the main rubber elastic body at the time of vibration input between the main liquid chamber and a part of the wall of the main liquid chamber is formed by a movable member. A fluid-filled anti-vibration device that is configured to vibrate the movable member at an appropriate frequency corresponding to the vibration to be anti-vibrated and control the internal pressure of the main liquid chamber to adjust the anti-vibration characteristics appropriately It has been known.

In Japanese Utility Model Laid-Open Publication No. 61-191543, a sub-liquid chamber is formed through an orifice passage to a main liquid chamber in which an internal pressure change occurs at the time of vibration input. The sub-liquid chamber communicates with each other through the orifice passage, and a part of the wall of the sub-liquid chamber is constituted by a movable member. By vibrating the movable member, an internal pressure change is generated in the sub-liquid chamber. A fluid filled type vibration damping device has been proposed. In such an anti-vibration device, the internal pressure change generated in the sub liquid chamber by the vibration of the movable member is adjusted in consideration of the internal pressure fluctuation caused in the main liquid chamber at the time of vibration input, so that the fluid through the orifice passage is adjusted. Therefore, it is possible to control the internal pressure of the main liquid chamber by utilizing the flow action such as the resonance action of the fluid caused to flow through the orifice passage, or by applying the internal pressure of the sub liquid chamber through the orifice passage. Or the like, the vibration damping effect can be advantageously obtained.

Incidentally, in such a fluid-filled type vibration damping device, in order to effectively obtain a desired vibration damping effect,
It is necessary to control the pressure of the fluid chamber at a magnitude and frequency corresponding to the input vibration.If the input vibration load is large, a large load is applied to the movable member to cause a large pressure change in the fluid chamber. It is necessary to exert vibration.

However, in the conventional fluid-filled type vibration damping device, if an attempt is made to increase the vibration force applied to the movable member, the vibration device exerting the vibration force on the movable member and, consequently, the size and weight of the whole vibration damping device are reduced. Since the increase is unavoidable, there are cases where it is difficult to achieve the required anti-vibration characteristics.

Conventionally, electromagnetic driving means is generally employed as a vibrating device for applying a vibrating force to a movable member. However, the output of the electromagnetic driving means is increased to obtain a large vibrating force. In such a case, a rise in temperature due to heat generated when the coil is energized, an increase in power consumption, and the like also become problems, so that it was more difficult to achieve the required anti-vibration characteristics.

[0007]

Here, the inventions according to claims 1 to 10 are all made on the background of the above-mentioned circumstances, and the solution is to solve the problem by vibrating a movable member. Provided is a fluid-filled vibration damping device having a simple structure and a compact structure capable of efficiently generating a large internal pressure change in a fluid chamber and thereby advantageously achieving required vibration damping characteristics. It is in.

[0008] The invention according to claims 1 to 10 is:
In any case, a fluid-filled type vibration damping device that can obtain an effective vibration damping effect based on the internal pressure control of the fluid chamber even for a plurality of types of input vibrations having different frequency ranges or input vibrations over a wide frequency range. The purpose is also to provide.

[0009]

In order to solve such a problem, a feature of the invention according to claim 1 is that a first mounting member and a second mounting member which are separated from each other are separated from each other by a rubber elastic body. While connecting with a body, a fluid chamber in which an incompressible fluid is sealed is formed, and a part of the wall of the fluid chamber is formed of a movable member, and the fluid is excited by vibrating the movable member. In the fluid filled type vibration damping device in which the internal pressure of the chamber is controlled to adjust the vibration damping characteristics, the first mounting member or the second mounting member is obtained by connecting a plurality of mass members to each other by an elastic plate. By elastically supporting the movable member, the movable member is configured to substantially include a plurality of vibration systems, and an exciting force is exerted on these vibration systems.

[0010] In the fluid filled type vibration damping device having the structure according to the first aspect of the present invention, since the movable member has a plurality of vibration systems, it is difficult to vibrate the movable member. At the time of vibration in the natural frequency range of each vibration system, a resonance phenomenon of the vibration system is generated, and based on the resonance action, the movable member is advantageously vibrated by a small vibration force to drive the fluid chamber. Therefore, a large change in the internal pressure is caused.

The elastic plate is not particularly limited as long as it can exhibit an appropriate spring constant, and the material and the like are not particularly limited. For example, a rubber elastic plate or a metal leaf spring is used. Also, the mass of the mass member and the spring constant of the elastic plate are set so that each vibration system has a natural frequency corresponding to the vibration to be damped. Further, when the respective vibration systems are connected to each other by an elastic plate and are formed continuously, by applying an exciting force to the vibration system directly to at least one vibration system, Can be indirectly vibrated through the elastic plate.

In the fluid filled type vibration damping device having the structure according to the first aspect of the present invention, a large change in internal pressure can be generated in the fluid chamber while avoiding an increase in size and weight. It is possible, thereby effectively exhibiting the vibration damping effect based on the internal pressure control of the fluid chamber.

Further, in such a fluid filled type vibration damping device, since the movable member is configured to include a plurality of vibration systems, a plurality of vibration systems are provided by making the natural frequencies of the respective vibration systems different. With respect to input vibration over a frequency range, a vibration isolation effect based on the control of the internal pressure of the fluid chamber can be advantageously obtained by utilizing the resonance action of each vibration system.

[0014] The invention described in claim 2 is the first invention.
In the fluid filled type vibration damping device having the structure according to the invention described in (1), the plurality of mass members are concentrically spaced apart from each other.

In the fluid filled type vibration damping device having the structure according to the second aspect of the present invention, a plurality of vibration systems are advantageously and efficiently arranged and configured on the movable member. , Each vibration system is advantageously excited in its natural frequency range. Thereby, in the natural frequency range of each vibration system, the internal pressure change in the fluid chamber is more efficiently generated, and the input vibration in the natural frequency range of each vibration system is controlled based on the internal pressure control of the fluid chamber. The anti-vibration effect will be exhibited more effectively.

[0016] The invention according to claim 3 provides the invention according to claim 1.
Or in the fluid filled type vibration damping device having a structure according to the invention described in 2, the working air chamber is formed on the opposite side to the fluid chamber with the movable member interposed therebetween, and the working air chamber is externally formed. It is characterized in that an exciting force is applied to the vibration system based on an applied air pressure change.

In the fluid filled type vibration damping device having the structure according to the third aspect of the present invention, the vibration system is vibrated by the action of the air pressure by exerting the air pressure fluctuation on the working air chamber. Therefore, there is no need to incorporate electromagnetic drive means inside the device,
The simplification of the structure of the device and further reduction in size and weight can be advantageously achieved. In addition, in such a fluid-filled type vibration damping device, even when the device is used continuously for a long time, there is no problem such as high temperature due to heat generation and securing of power consumption. When it is used for a vibration isolator, it is possible to easily obtain a negative pressure in an internal combustion engine, and it is not necessary to newly provide a special air pressure source or the like.

Moreover, if the working air chamber is formed over substantially the entire back of the movable member, the exciting force can be effectively and directly applied to a plurality of vibration systems. Thus, an exciting force can be efficiently applied to each vibration system.

In the fluid filled type vibration damping device having the structure according to the third aspect of the present invention, as described in the fourth aspect, the air pressure applied to the working air chamber is reduced. A pneumatic pressure control device that changes in synchronization with the frequency of the vibration to be applied is suitably employed, whereby an effective anti-vibration effect against input vibration is stably exhibited. Here, in order to fluctuate the air pressure of the working air chamber in synchronization with the frequency of the vibration to be damped, for example, the working air chamber is selected between an air pressure source such as a negative pressure and the atmosphere by operating a switching valve. Advantageously, this can be done, for example, by a single switching connection. At this time, as the switching valve, for example, an electromagnetic switching valve or the like can be suitably used so that control can be easily performed and switching can be performed at a high speed. For example, a vibration-proof object detected by an acceleration sensor or the like can be used. Based on the vibration signal, the switching valve for performing air pressure control on the working air chamber is controlled by a known adaptive control, map control, or the like so as to reduce the vibration of the vibration isolation target. Pneumatic control of the chamber can be advantageously implemented.

The invention described in claim 5 is the first invention.
In the fluid filled type vibration damping device having the structure according to any one of the above-described embodiments, a part of a wall portion of the fluid chamber is formed of the main rubber elastic body, and an internal pressure fluctuation occurs at the time of vibration input. The main liquid chamber is configured to include a main liquid chamber, and another part of the wall portion of the main liquid chamber is configured by the movable member, and the main liquid chamber is moved to the main liquid chamber by excitation of the vibration system in the movable member. It is characterized in that the internal pressure is directly changed.

In the fluid filled type vibration damping device having the structure according to the fifth aspect of the present invention, the vibration damping characteristics are controlled by directly controlling the internal pressure of the main liquid chamber by vibrating the vibration system. You can do it.

The invention according to claim 6 is the first invention.
6. A fluid-filled vibration damping device having a structure according to any one of claims 5 to 5, wherein the fluid chamber has a wall portion formed of the main rubber elastic body, and a main liquid in which an internal pressure fluctuation occurs at the time of vibration input. And a sub-liquid chamber in which a part of a wall is formed by the movable member and which is communicated with the main liquid chamber through an orifice passage. It is characterized in that an internal pressure change is caused in the auxiliary liquid chamber.

In the fluid filled type vibration damping device having the structure according to the sixth aspect of the present invention, since the pressure of the sub-liquid chamber is changed by the vibration of the vibration system, the main liquid is supplied by the vibration input. By controlling the internal pressure of the sub-liquid chamber by vibrating the vibration system with an appropriate phase difference with respect to the input vibration in consideration of the pressure fluctuation of the chamber, the flow action of the fluid flowing through the orifice passage and the flow through the orifice passage Based on the control of the internal pressure of the main liquid chamber, the desired vibration damping characteristics can be obtained.

Further, in the fluid filled type vibration damping device structured according to the invention of claim 7, the fluid filled type vibration damping device structured according to the invention of claim 6 is provided. Are formed independently of each other,
In addition, a part of the wall portion of each of the sub liquid chambers is constituted by any of the plurality of vibration systems in the movable member, and a plurality of orifices for communicating each of the sub liquid chambers with the main liquid chamber. That the passage is formed
Features.

In the fluid filled type vibration damping device having the structure according to the seventh aspect of the present invention, the frequency ranges different from each other are based on the flow action such as the resonance action of the fluid flowing through each orifice passage. , It is possible to obtain an effective anti-vibration effect against the input vibration, and an excellent anti-vibration effect can be exerted over a wide frequency range.

When a plurality of orifice passages are formed, each orifice passage can be formed so that each sub liquid chamber is directly connected to the main liquid chamber. By forming an orifice passage extending between the liquid chambers, the sub liquid chamber may be indirectly connected to the main liquid chamber via another sub liquid chamber.

In the case where the orifice passage is formed such that the sub liquid chamber is indirectly connected to the main liquid chamber via another sub liquid chamber, for example, claim 8
As described in the above, the plurality of orifice passages are formed so that the plurality of sub-liquid chambers and the main liquid chamber are connected in series with each other, and the orifice passage closer to the main liquid chamber is tuned to the higher frequency side. It is desirable. In the fluid filled type vibration damping device having the structure according to the eighth aspect of the present invention, the fluid-filled vibration isolator is provided based on the flow action of the fluid caused to flow through each orifice passage without providing any special means for switching the orifice passage. Any of the anti-vibration effects can be effectively obtained.

The invention according to claim 9 is the first invention.
In the fluid filled type vibration damping device having a structure according to any one of the above aspects, the fluid chamber may have a part of a wall portion formed of the main rubber elastic body, thereby causing an internal pressure fluctuation at the time of vibration input. While the main liquid chamber is configured to include the main liquid chamber, an equilibrium chamber in which a part of a wall portion is formed of a flexible membrane and volume change is allowed is provided independently of the main liquid chamber, The incompressible fluid is sealed in the equilibrium chamber, and a fluid communication passage communicating the equilibrium chamber with the main liquid chamber is formed.

In the fluid filled type vibration damping device having the structure according to the ninth aspect of the present invention, a pressure fluctuation is generated in the main liquid chamber at the time of vibration input, so that the main liquid chamber and the equilibrium chamber are separated. A pressure difference occurs between the two chambers, and a fluid flow is generated between the two chambers through the fluid communication passage, and based on a fluid action such as a resonance action of the fluid caused to flow through the fluid communication passage, An effective anti-vibration effect is exhibited.

Therefore, for example, if such a fluid communication passage is employed in combination with the orifice passage, and the fluid communication passage is tuned differently from the orifice passage, an input in which the orifice passage exerts a vibration damping effect can be obtained. Effective vibration damping effect can be obtained for vibration different from vibration,
Further improvement in vibration isolation performance can be achieved.

According to a tenth aspect of the present invention, in the fluid filled type vibration damping device having a structure according to any one of the first to ninth aspects, the elastic plate constituting the movable member is It has a restoring force to a constant shape based on elasticity.

In the fluid filled type vibration damping device having the structure according to the tenth aspect of the present invention, the external force (exciting force) with respect to each vibration system constituting the movable member is released. Since the vibration system is returned to and held at a substantially constant position, the internal pressure of the fluid chamber can be easily controlled. Further, in particular, when the exciting force of the vibration system is obtained by the air pressure according to the invention of claim 3, the vibration system is returned to the predetermined position when the air pressure applied to the working air chamber is released. For example, as the air pressure applied to the working air chamber, the air pressure fluctuates only on one side of the negative pressure or the positive pressure, or the alternating of one of the negative pressure or the positive pressure of a certain magnitude and the atmospheric pressure. By employing a variable air pressure or the like due to switching, the movable member can be advantageously vibrated.

Incidentally, in order to assist the restoring force to a constant shape based on the elasticity of the elastic plate, it is possible to provide an urging means for constantly applying an urging force in a specific direction to the elastic plate.
For example, if a coil spring or the like is employed as the urging means, the elastic plate can be advantageously restored to a constant shape advantageously and stably over a long period of time.

[0034]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, in order to clarify the present invention more specifically, embodiments of the present invention will be described in detail with reference to the drawings.

FIG. 1 shows an engine mount 10 for an automobile according to a first embodiment of the present invention. The engine mount 10 has a first mounting member 12 and a second mounting member 14 as a first mounting member and a second mounting member which are arranged opposite to each other at a predetermined distance from each other. The two mounting brackets 12 and 14 are connected by a main rubber elastic body 16, and one of the first mounting bracket 12 and the second mounting bracket 14 is mounted on one of the power unit side and the body side.
The power unit is designed to support the body against vibration. In the engine mount 10, a main unit rubber elastic body 16 is compressed and deformed when a power unit load is applied when the engine mount 10 is mounted on an automobile. Further, in such a mounted state, vibration to be damped is input in a direction substantially opposite to the first mounting member 12 and the second mounting member 14 (vertical direction in FIG. 1).
In the following description, the terms “upper” and “lower” mean, in principle, “upper” and “lower” in FIG.

More specifically, the first mounting bracket 12 is configured such that an upper bracket 18 and a lower bracket 20 each having a substantially cylindrical shape with a bottom are axially overlapped with each other on each opening side and are bolted together. It is formed with a hollow structure. A mounting bolt 22 protruding outward is fixed to the bottom wall of the upper bracket 18 so that the first mounting bracket 12 can be mounted on the power unit side or the body side by the mounting bolt 22. Has become.

In the hollow inside of the first mounting member 12, a rubber elastic film 23 having an easily deformable thin and substantially disk shape as a flexible film is housed and arranged. By being clamped between the metal fittings 18 and 20, the hollow interior of the first mounting metal part 12 is fluid-tightly partitioned between the upper metal part 18 and the lower metal part 20 with the rubber elastic film 23 interposed therebetween. As a result, an equilibrium chamber 24 is formed between the rubber elastic film 23 and the lower fitting 20, in which an incompressible fluid is sealed, and a volume change is easily allowed based on the deformation of the rubber elastic film 23. An air chamber 25 is formed between the rubber elastic film 23 and the upper fitting 18 and communicates with the external space to allow the rubber elastic film 23 to deform. In addition, any of water, alkylene glycol, polyalkylene glycol, silicone oil, and the like can be used as the sealing fluid.
In order to effectively obtain an anti-vibration effect based on the resonance action of the fluid, a material having a viscosity of 0.1 Pa · s or less is desirable.

Further, a disc-shaped passage forming member 26 is superimposed on the bottom wall of the lower metal member 20 constituting the first mounting member 12 and fixed by bolts. A fluid communication path 27 extending a little less than one circumference in the circumferential direction is formed between the overlapping surfaces of the lower metal fitting 20 and the passage forming metal fitting 26, and one end of the fluid communication path 27 is It is communicated with the equilibrium chamber 24.

On the other hand, the second mounting member 14 includes a ring-shaped support metal member 28 and a disk-shaped bottom metal member 29.
It is constituted by being overlapped with each other in the axial direction and connected by bolts, and has a thick bottomed cylindrical shape having a concave portion 30 opened at the center of the upper surface as a whole.
The bottom fitting 29 has a mounting bolt 33 protruding downward.
The second mounting bracket 14 is mounted on the body side or the power unit side by the mounting bolts 33.

The second mounting member 14 is opposed to the first mounting member 12 at a predetermined distance axially downward with a predetermined distance therebetween, and a main rubber member interposed therebetween. They are elastically connected by an elastic body 16.

The main rubber elastic body 16 has a thick tapered cylindrical shape, and its small diameter side opening is vulcanized and bonded to the outer peripheral surface of the lower metal fitting 20 constituting the first mounting metal 12. On the other hand, a connection ring 31 is vulcanized and bonded to the large-diameter side opening, and the connection ring 31 is superimposed on the upper surface of a support fitting 28 that constitutes the second mounting fitting 14 so as to be bolted. As a result, the large-diameter side opening is fixed to the second mounting member 14. As a result, an inner space is defined between the opposing surfaces of the first mounting member 12 and the second mounting member 14, the periphery of which is defined by the main rubber elastic body 16 and is fluid-tightly closed with respect to the outer space. Have been. A restraining ring 32 for stabilizing elastic deformation and preventing buckling or the like is vulcanized and bonded to an intermediate portion in the axial direction of the main rubber elastic body 16.

A movable member 34 having a substantially disk shape as a whole is accommodated in the recess 30 formed in the second mounting member 14. An internal space formed between the facing surfaces of the mounting bracket 12 and the second mounting bracket 14 is fluid-tightly partitioned between the first mounting bracket 12 side and the second mounting bracket 14 side.
An incompressible fluid is sealed on the first mounting member 12 side to form a fluid chamber 36 with the movable member 34 interposed therebetween, while a working air chamber is formed on the second mounting member 14 side. 3
8 are formed, and the second mounting bracket 14 (the bottom bracket 2
The air pressure applied to the movable member 34 is changed by the supply and exhaust of air to and from the working air chamber 38 through the air supply and exhaust passage 39 formed through 9). In addition, as the fluid to be filled in the fluid chamber 36, the first fitting 1
The same fluid as the sealed fluid in the equilibrium chamber 24 formed in the chamber 2 is employed.

Here, the movable member 34 has a rubber elastic plate 40 having a substantially disk shape, and a disk-shaped first mass metal fitting 42 is provided at the center of the rubber elastic plate 40. While being vulcanized and bonded to the radially intermediate portion of the rubber elastic plate 40, an annular second mass metal fitting 44 is provided.
Are vulcanized and adhered. In other words, the second mass metal fitting 4
4 are concentrically arranged at a predetermined distance radially outward of the first mass metal fitting 42, and the first and second mass metal fittings 42, 44 are elastically fixed by the rubber elastic plate 40. It is connected to. Then, the rubber elastic plate 40 is supported by the second mounting member 14 by being vulcanized and bonded to the inner peripheral surface of the supporting member 28, and is separated from the bottom metal member 29 by a predetermined distance. It is arranged.

On the movable member 34, a first partition member 46 having a substantially thick disk shape as a whole is superposed from above, and the outer peripheral edge is placed on the upper surface of the second mass metal fitting 44. In this state, it is bolted to the second mass fitting 44. The central portion of the first partition member 46 is separated from the central portion of the movable member 34 to which the first mass metal member 42 has been vulcanized by a predetermined distance, so that the second partition member 46 has a second portion. The movable member 34 and the first partition member 46 are located radially inward of the mass metal fitting 44.
A first sub-liquid chamber 48 is formed between the opposed surfaces of the first and second sub-liquid chambers 48.

Further, a substantially hat-shaped second partition member 50 formed of a thin metal plate is disposed above the movable member 34, and the outer peripheral flange is connected to the support fitting 28 and the connecting ring. By being sandwiched between the second mounting brackets 31, the second mounting bracket 14 is fixed. The second partition member 50 is separated from the movable member 34 on which the first partition member 46 is mounted by a predetermined distance, so that the movable member on which the first partition member 46 is mounted is movable. A second auxiliary liquid chamber 52 is formed between the facing surfaces of the member 34 and the second partition member 50.

On the other hand, with the second partition member 50 interposed therebetween,
On the side opposite to the second auxiliary liquid chamber 52, a main liquid chamber 53 is formed between the opposing surfaces of the first mounting member 12 and the second partition member 50. The peripheral wall of the main liquid chamber 53 is formed of the main rubber elastic body 16, and an internal pressure fluctuation is generated based on the elastic deformation of the main rubber elastic body 16 at the time of vibration input. Further, the main liquid chamber 53 communicates with the equilibrium chamber 24 formed inside the first fitting 12 through the fluid communication passage 27. Then, at the time of vibration input, a fluid flow through the fluid communication passage 27 is generated by an internal pressure difference generated between the main liquid chamber 53 and the equilibrium chamber 24, thereby preventing the fluid based on a fluid action such as a resonance action. The vibration effect is exhibited. The tuning frequency of the fluid communication path 27 is not limited at all, but in the present embodiment, in particular, the fluid communication path 2
7 is tuned to a low frequency range, and based on the fluid flow action through the fluid communication passage 27, the fluid communication passage is designed to exhibit an effective vibration damping effect against low frequency vibration such as a shake. The length, cross-sectional area and the like of 27 are set.

In short, the first partition member 46 as described above
The fluid chamber 36 formed between the first mounting member 12 and the movable member 34 is divided into three by the and the second partition member 50, so that the first sub-liquid chamber 48 and the second Sub liquid chamber 5
2 and the main liquid chamber 53 are formed. Also,
Both the first sub liquid chamber 48 and the second sub liquid chamber 52 are
A part of the wall is constituted by the movable member 34. The portion of the movable member 34 that constitutes the wall of the first auxiliary liquid chamber 48 is elastic with respect to the first mass metal fitting 42 and the second mass metal fitting 44. Annular first elastic connecting portion 54 of rubber elastic plate 40
To form a first vibration system 55. Further, of the movable member 34, the portion constituting the wall portion of the second sub liquid chamber 52 includes a second mass metal fitting 44 to which the first partition member 46 is attached, and the second mass metal fitting 44. A second vibration system 57 is formed by an annular second elastic connecting portion 56 of the rubber elastic plate 40 elastically connected to the second mounting member 14.

Further, the first partition member 46 is constituted by laminating a thin upper metal plate 59 on the upper surface of a thick lower metal plate 58, and a predetermined length provided on the lower metal plate 58. The first groove 62 is covered with the upper metal fitting 59 to form a first orifice passage 62 that connects the first sub liquid chamber 48 and the second sub liquid chamber 52 to each other. In the second partition member 50, a second orifice passage 64 extending through the center portion in the axial direction and communicating the second sub liquid chamber 52 and the main liquid chamber 53 with each other is formed. . In short, the first orifice passage 62 and the second orifice passage 64 allow the first sub-liquid chamber 48, the second sub-liquid chamber 52, and the main liquid chamber 53 to connect and communicate in series with each other, It is formed so as to extend between the first sub liquid chamber 48 and the second sub liquid chamber 52 and between the second sub liquid chamber 52 and the main liquid chamber 53, respectively.

The first orifice passage 62
A predetermined vibration damping effect is exerted on the basis of a fluid action such as a resonance action of the fluid caused to flow through the second orifice passage 64. The tuning frequency of the first and second orifice passages 62 and 64 is not limited at all, but in the present embodiment, in particular, the first orifice passage 62 is
The second orifice passage 64 is located in a higher frequency range than the fluid communication passage 27 formed in the first orifice passage 62.
Each is tuned to a higher frequency range. Specifically, for example, the first orifice passage 62
Based on the resonance effect of the fluid flowing through the second orifice passage 64, it is possible to exhibit an effective vibration damping effect against medium frequency vibration such as idling vibration based on the resonance effect of the fluid flowing through the second orifice passage 64. The passage lengths, cross-sectional areas, and the like of the orifice passages 62 and 64 are set so that an effective vibration damping effect against high-frequency vibrations such as a booming sound is exerted.

Here, the first vibration system 55 constituting the wall of the first sub liquid chamber 48 is set such that its natural frequency corresponds to the tuning frequency of the first orifice passage 62. And the second sub liquid chamber 5
The second vibration system 57 constituting the second wall is set so that its natural frequency corresponds to the tuning frequency of the second orifice passage 64. In the first vibration system 55, the natural frequency can be tuned by adjusting the mass of the first mass fitting 42 and the spring constant of the first elastic connecting portion 54. Also, the second vibration system 5
In 7, the natural frequency can be tuned by adjusting the mass of the second mass fitting 44 and the first partition member 46 and the spring constant of the second elastic connecting portion 56. When tuning the second vibration system 57, if necessary, the effect of the mass of the sealed fluid in the first sub liquid chamber 48 due to the substantial closing of the first orifice passage 62 is also taken into consideration. Is done.

The engine mount 10 having the above-described structure is mounted on an automobile and the air supply / discharge path 3 is mounted.
An air pressure line 68 is connected to a port 66 fixed to 9, and the working air chamber 38 is connected to the switching valve 70 through the air pressure line 68 and the air supply / discharge line 39.
In accordance with the switching operation of the switching valve 70, the working air chamber 38 is made to selectively communicate with the negative pressure tank 72 and the atmosphere. In short, the switching valve 70
, The negative pressure and the atmospheric pressure are selectively applied to the working air chamber 38, and the switching valve 7
By switching 0 at an appropriate period, a periodic air pressure fluctuation is generated in the working air chamber 38.

Therefore, if the switching valve 70 is switched at a frequency corresponding to the vibration to be damped, the fluctuation of the air pressure in the working air chamber 38 is exerted on the movable member 34 and the movable member 34
Is deformed and vibrated based on the elastic deformation of the rubber elastic plate 40, so that the first sub-liquid chamber 48 and the second sub-liquid chamber 52 in which a part of the wall is formed by the movable member 34. On the other hand, an internal pressure change occurs at a frequency corresponding to the vibration to be damped. As a result, an internal pressure difference is advantageously generated between the first and second sub liquid chambers 48 and 52 and the main liquid chamber 53 in which the internal pressure fluctuation is caused by the vibration input, and based on the internal pressure difference, First orifice passage 62
And the fluid flow through the second orifice passage 64 is generated, whereby the vibration damping effect based on the fluid action such as the resonance action of the fluid is exhibited.

When the vibration of the movable member 34 is controlled by the switching operation of the switching valve 70, the vibration of the vibration damping target is reduced as much as possible by using a reference signal corresponding to the input vibration detected by an acceleration sensor or the like. Any of feedback control such as adaptive control, map control, and the like can be adopted, and the period, phase difference, excitation force, and the like are determined so that the required anti-vibration effect is advantageously exerted. Also,
As is apparent from this, in the present embodiment, including the switching valve 70 and the switching operation control system of the switching valve 70, the air pressure applied to the working air chamber 38 is synchronized with the frequency of the vibration to be damped. A variable air pressure control device is configured.

Here, a first vibration system 55 having a natural frequency corresponding to the tuning frequency of the first orifice passage 62 is formed on the wall of the first auxiliary liquid chamber 48 formed by the movable member 34. Therefore, in the region of the natural frequency, the first sub-liquid chamber 48 is applied to the first sub-liquid chamber 48 by the excitation force due to the small air pressure fluctuation in the working air chamber 38 based on the resonance phenomenon of the first vibration system 55 itself. Large internal pressure fluctuations can be generated efficiently. Therefore, in the first orifice passage 62 tuned in accordance with the natural frequency of the first vibration system 55, the fluid flow rate in the tuning frequency range is more advantageously secured, whereby Thus, the vibration damping effect based on the flow action of the fluid caused to flow through the first orifice passage 62 is more effectively exhibited.

In the wall of the second auxiliary liquid chamber 52 constituted by the movable member 34, the second orifice passage 64
Since the second vibration system 57 having the natural frequency corresponding to the tuning frequency of the second vibration system 57 is configured, in the region of the natural frequency, the working air chamber 38 based on the resonance phenomenon of the second vibration system 57 itself. A large internal pressure fluctuation can be efficiently generated in the second sub liquid chamber 52 by the excitation force caused by the small air pressure fluctuation. Therefore, in the second orifice passage 64 tuned in accordance with the natural frequency of the second vibration system 57, the fluid flow rate in the tuning frequency range is more advantageously secured, whereby Thus, the vibration damping effect based on the flow action of the fluid caused to flow through the second orifice passage 64 is more effectively exerted.

Since the second orifice passage 64 is tuned to a higher frequency range than the first orifice passage 62, in the resonance frequency range of the first vibration system 55,
Both the first and second orifice passages 62 and 64 maintain a low fluid flow resistance, and the first orifice passage 6
The fluid flowing out and in from the first sub liquid chamber 48 through the second orifice 2 passes through the second orifice passage 64 through the main liquid chamber 53.
In addition, in the resonance frequency range of the second vibration system 57, the fluid flow resistance of the first orifice passage 62 becomes extremely large and the first orifice passage 62 becomes substantially closed. In accordance with the change in the internal pressure of the second sub-liquid chamber 52, the amount of fluid which is allowed to flow through the second orifice passage 64 between the second sub-liquid chamber 52 and the main liquid chamber 53 is advantageously secured. Becomes Therefore, the first orifice passage 62 can be provided without providing a means for switching the orifice passage.
In each of the second orifice passage 64 and the second orifice passage 64, the fluid flow rate in each tuning frequency range is advantageously secured, and the vibration damping effect based on the resonance action of the fluid,
Each is extremely effective.

Further, the engine mount 10 of the present embodiment
Since there is no need to incorporate an actuator member such as an electromagnetic drive means into itself, there is a great advantage that the structure is extremely simple, easy to manufacture, lightweight, compact and inexpensive. Moreover, since the structure is simple, it has excellent durability and reliability, and has an advantage that it is easy to cope with a failure.

Further, the engine mount 1 of the present embodiment
In the case of 0, since the exciting force is exerted on the movable member 34 using the negative pressure, the negative pressure generated in the intake system can be effectively utilized particularly in an automobile or the like using an internal combustion engine. In addition to the fact that no means for generating drive energy is required, even in the case of continuous operation, there is no problem with energized heat generation and power consumption which are likely to be a problem when employing an electromagnetic drive means, for a long time. And stable performance is exhibited.

Further, by applying an exciting force to the movable member 34 by using the negative pressure, it is possible to apply an exciting force to the entire movable member 34, thereby making it possible to apply the first and second vibrations. Since the vibrating force is directly applied to the systems 55 and 57, the first and second vibration systems 5
There is also an advantage that the vibration control of 5, 57 can be performed easily and advantageously.

The engine mount 10 of the present embodiment
In the above, the first mass metal fitting 42
And the second mass fitting 44 are concentrically spaced apart from each other, and the first partition member 4 supported by the second mass fitting 44 is located between the first mounting fixture 12 and the movable member 34.
6 and the second partition member 50 supported by the second mounting member 14 are disposed at a predetermined distance from each other to partition the fluid chamber 36. The first and second sub liquid chambers 48, 52 and the main liquid chamber 53, each of which is partially configured, can be advantageously formed with a simple structure and an efficient arrangement.

Further, in the engine mount 10 of the present embodiment, the first orifice passage 62 and the second orifice passage 64 are formed by the first sub liquid chamber 48, the second sub liquid chamber 52, and the main liquid chamber. 53, the first and second orifice passages 62,
There is also an advantage that the structure 64 can be formed compactly with a simple structure.

The engine mount 10 of the present embodiment
In the state, based on the restoring force due to the elasticity of the rubber elastic plate 40, under the state where the working air chamber 54 is connected to the atmosphere,
Since the movable member 34 is held in a substantially flat plate shape, a predetermined amount of negative pressure is intermittently applied to the working air chamber 38 to apply a force to the first and second vibration systems 55 and 57. The vibration force can be easily and advantageously applied.

When the compressed air can be easily obtained, the rubber elastic plate 40 may be deformed and displaced by using a positive pressure instead of a negative pressure. Of course, it is also possible to deform and displace the rubber elastic plate 40 by increasing and decreasing the pressure by using.

When the rubber elastic plate 40 is deformed and displaced by using only one of the negative pressure and the positive pressure as in the present embodiment, the restoring displacement force due to the elasticity of the rubber elastic plate 40 itself is assisted. In order to achieve this, it is also effective to provide an urging means such as a coil spring between the rubber elastic plate 40 and the second mounting member 14 (the bottom metal member 29).

Further, the fluid communication passage 27 and the equilibrium chamber 24
Is adopted in accordance with the required characteristics of the mount, and is not necessarily provided. Further, depending on the mount required characteristics, it is also possible to provide a plurality of fluid communication passages 27 tuned differently from each other.

Further, the vibration system 5 in the movable member 34
Other than the pneumatic mechanism as in the present embodiment, a means for applying a vibrating force to 5, 57 may be appropriately employed. Specifically, for example, as shown in FIG. 2, a bobbin 76 on which a coil 74 is wound and mounted is fixed to the first mass metal fitting 42 constituting the first vibration system 55 by bolts. On the other hand, the permanent magnet 78
And the yoke members 80 and 82 are fixed by bolts to form a magnetic path around the coil 74, so that the first mass metal fitting 42 utilizes the electromagnetic force generated by the application of the alternating current to the coil 74. It is also possible to employ an electromagnetic drive means for exerting a vibrating force on the motor. In the electromagnetic driving means having such a structure, the second vibration system 57 includes the rubber elastic plate 40.
The excitation force is transmitted via the. The yoke members 80 and 82 constitute the second support fitting 14 in cooperation with the support fitting 28, and the second mounting fitting 14 is formed by a bolt hole 79 formed in the yoke member 82. Side or power unit side. In the engine mount 83 shown in FIG. 2, in order to facilitate understanding, members and parts having the same structure as in the first embodiment are respectively shown in FIG. The same reference numerals as in the embodiment are attached.

In the engine mount 10 of the first embodiment, the first sub-liquid chamber 4 is formed by the first vibration system 55 and the second vibration system 57 of the movable member 34.
8 and a part of the wall of the second sub-liquid chamber 52 are formed, and the first and second sub-liquid chambers 48, 52 are excited by the vibration of the first and second vibration systems 55, 57. The internal pressure of the orifices 62 and 64 is changed to positively generate fluid flow through the first and second orifice passages 62 and 64, thereby exhibiting an anti-vibration effect based on the fluid flow action in the orifice passages 62 and 64. However, a part of the wall of the main liquid chamber 53 is constituted by a vibration system of the movable member 34, and the vibration system is vibrated to directly control the internal pressure of the main liquid chamber 53. By doing so, it is also possible to obtain the desired anti-vibration characteristics. The specific configuration example is shown in FIGS. In FIGS. 3 and 4,
In each case, only the characteristic portions are shown, and portions having the same structure as in the first embodiment are not shown, and members and portions having the same structure as in the first embodiment are shown in the drawings. The same reference numerals as in the first embodiment denote the same, and a detailed description thereof will be omitted.

That is, the engine mount 84 shown in FIG. 3 does not employ the second partition member (50) as compared with the engine mount (10) of the first embodiment, The chamber 36 includes a first sub liquid chamber 48 and a main liquid chamber 53 partitioned by a first partition member 46. Thus, a part of the wall of the main liquid chamber 53 is constituted by the movable member 34 to which the first partition member 46 is attached. The portion of the movable member 34 that constitutes the wall of the main liquid chamber 53 is a second mass fitting 44 to which the first partition member 46 is attached, and the second mass fitting 44 is a second mass fitting 44. The second vibration system 57 is formed by the annular second elastic connecting portion 56 of the rubber elastic plate 40 elastically connected to the mounting fitting 14.

Therefore, in the engine mount 84 having such a structure, the first orifice passage 62 and the first vibration system 55 are tuned to the vibration frequency of the tuned medium frequency range. By applying a change in air pressure to the working air chamber 38 at a corresponding cycle to vibrate the first vibration system 55, the first orifice passage 62
Based on the flow action of the fluid caused to flow between the first sub liquid chamber 48 and the main liquid chamber 53, the same vibration damping effect as in the first embodiment can be effectively exerted, With respect to the input vibration, the internal pressure of the main liquid chamber 53 is positively controlled by applying an air pressure change to the working air chamber 38 at a cycle corresponding to the vibration frequency to vibrate the second vibration system 57. Therefore, an anti-vibration effect based on the internal pressure control of the main liquid chamber 53 can be obtained.

Here, the natural frequency of the second vibration system 57 is tuned in accordance with the frequency of the input vibration to be damped based on the control of the internal pressure of the main liquid chamber 53, so that the second vibration By utilizing the resonance action of the system 57, a large internal pressure is positively generated in the main liquid chamber 53, and an extremely effective internal pressure control effect can be efficiently obtained.

The engine mount 8 shown in FIG.
6, the first and second partition members (46, 46) are different from the engine mount (10) according to the first embodiment.
50) is not adopted, and one main liquid chamber 53 is constituted by the entire fluid chamber 36. Thus, a part of the wall of the main liquid chamber 53 is constituted by the movable member 34. The movable member 34 includes a first mass fitting 42.
And the second mass fitting 44 are connected by the rubber elastic plate 40 (the first and second elastic coupling portions 54 and 56), so that the first and second mass fittings 42 and 4
By virtue of an appropriate combination of the first and second elastic connecting portions 54 and 56, a plurality of vibration systems having different natural frequencies are formed.

Therefore, in the engine mount 84 having such a structure, the natural frequencies of the respective vibration systems of the movable member 34 are tuned in accordance with the vibration frequencies to be damped. In the region, the exciting force due to the change in the air pressure of the working air chamber 38 efficiently acts on the movable member 34 by the resonance action of the vibration system, whereby the main liquid chamber 53 is positively changed in the internal pressure. Thus, the internal pressure of the main liquid chamber 53 is advantageously controlled, so that an excellent vibration damping effect is exerted against the input vibration in each frequency range.

The embodiments of the present invention have been described in detail above, but these are merely examples, and the present invention
The description of these specific embodiments should not be construed as limiting in any way.

For example, the movable member has only to have a plurality of vibration systems, and its specific structure is not limited at all. For example, three or more mass members may be employed, or three or more vibration systems may be employed. It is also possible to configure
It is not always necessary to arrange a plurality of mass members concentrically.

In each of the above embodiments, an engine mount for an automobile has been exemplified. However, in addition to a body mount for automobiles, a differential mount, a suspension bush, or a vibration isolator for various devices other than automobiles, etc. Similarly, the present invention can be advantageously applied.

Further, a first mounting member and a second mounting member are constituted by a shaft member and an outer cylinder member arranged at a predetermined distance in the radial direction from each other, and the shaft member and the outer cylinder member are formed. The present invention is also applicable to a cylindrical vibration damping device in which are connected by a main rubber elastic body interposed between the radially opposed surfaces of both members.

In addition, although not enumerated one by one, the present invention
Based on the knowledge of those skilled in the art, the present invention can be implemented in a form in which various changes, modifications, improvements, and the like are made.
It goes without saying that all such embodiments are included within the scope of the present invention, without departing from the spirit of the present invention.

[0078]

As is clear from the above description, in the fluid filled type vibration damping device having the structure according to the first to tenth aspects of the present invention, each of the fluid filled type vibration damping devices is based on the resonance action of each vibration system. The movable member constituting the wall of the fluid chamber can be advantageously excited by a small excitation force, so that a positive internal pressure change in the fluid chamber is efficiently generated, and the internal pressure of the fluid chamber is controlled. The anti-vibration effect based on this is very effectively exhibited.

Since the movable member has a plurality of vibration systems, the excellent vibration-proof effect based on the internal pressure control of the fluid chamber utilizing the resonance action of the movable member as described above can be achieved by tuning each vibration system. It is possible to effectively exhibit each of the input vibrations in a plurality of frequency ranges.

[Brief description of the drawings]

FIG. 1 is an explanatory longitudinal sectional view showing an engine mount as a first embodiment of the present invention.

FIG. 2 is an explanatory longitudinal sectional view showing an engine mount according to a second embodiment of the present invention.

FIG. 3 is an explanatory longitudinal sectional view showing an engine mount as a third embodiment of the present invention.

FIG. 4 is an explanatory longitudinal sectional view showing an engine mount according to a fourth embodiment of the present invention.

[Explanation of symbols]

 10, 83, 84, 86 Engine mount 12 First mounting bracket 14 Second mounting bracket 16 Body rubber elastic body 34 Movable member 36 Fluid chamber 38 Working air chamber 40 Rubber elastic plate 42 First mass bracket 44 Second Mass fitting 46 First partition member 48 First sub-liquid chamber 50 Second partition member 52 Second sub-liquid chamber 53 Main liquid chamber 54 First elastic connecting part 55 First vibration system 56 Second elastic Connecting part 57 Second vibration system 62 First orifice passage 64 Second orifice passage 70 Switching valve

Claims (10)

[Claims] A first mounting member and a second mounting member which are spaced apart from each other are connected by a main rubber elastic body, and a fluid chamber in which an incompressible fluid is sealed is formed. In a fluid-filled type vibration damping device in which a part of a wall portion is formed of a movable member and the movable member is vibrated to control an internal pressure of the fluid chamber and adjust vibration damping characteristics, By connecting the mass members to each other by an elastic plate and elastically supporting the first mounting member or the second mounting member, the movable member substantially includes a plurality of vibration systems. A fluid-filled type vibration damping device, comprising: a vibrating force applied to these vibration systems. 2. The fluid filled type vibration damping device according to claim 1, wherein the plurality of mass members are concentrically spaced apart from each other. 3. A closed working air chamber is formed on the opposite side of the fluid chamber with respect to the movable member, and the vibration system is controlled based on a change in air pressure applied to the working air chamber from outside. The fluid filled type vibration damping device according to claim 1, wherein a vibration force is exerted on the vibration damping device. 4. An air pressure applied to the working air chamber,
4. The fluid filled type vibration damping device according to claim 3, further comprising an air pressure control device which changes the frequency in synchronization with the frequency of the vibration to be damped. 5. The fluid chamber includes a main fluid chamber in which a part of a wall is formed by the main rubber elastic body and an internal pressure fluctuation is generated at the time of vibration input. Another part of the wall portion is constituted by the movable member,
The fluid filled type vibration damping device according to any one of claims 1 to 4, wherein an internal pressure change is directly applied to the main liquid chamber by the vibration of the vibration system. 6. A main liquid chamber in which the fluid chamber has a wall formed by the main rubber elastic body to cause an internal pressure fluctuation when vibration is input, and an orifice in which a part of the wall is formed by the movable member. 6. The liquid storage device according to claim 1, further comprising a sub-liquid chamber communicated with the main liquid chamber through a passage, wherein the vibration of the movable member causes an internal pressure change in the sub-liquid chamber. The fluid filled type vibration damping device according to any one of the above. 7. A plurality of sub-liquid chambers are formed independently of each other, and a part of a wall portion of each of the sub-liquid chambers is constituted by any one of the plurality of vibration systems in the movable member. 7. The fluid filled type vibration damping device according to claim 6, wherein a plurality of orifice passages are formed to connect each of the sub liquid chambers to the main liquid chamber. 8. The plurality of orifice passages are formed so as to connect the plurality of sub liquid chambers and the main liquid chamber in series with each other, and the orifice passage closer to the main liquid chamber is closer to the high frequency side. The fluid filled type vibration damping device according to claim 7, which is tuned. 9. The fluid chamber includes a main fluid chamber in which a part of a wall portion is constituted by the main rubber elastic body and an internal pressure fluctuation is generated at the time of vibration input. Independently from the above, there is provided an equilibrium chamber in which a part of a wall portion is formed of a flexible membrane and volume change is allowed, and the incompressible fluid is sealed in the equilibrium chamber, and 2. A fluid communication passage for communicating a chamber with the main liquid chamber is formed.
9. The fluid filled type vibration damping device according to any one of claims 1 to 8. 10. The fluid filled type vibration damping device according to claim 1, wherein the elastic plate forming the movable member has a restoring force to a constant shape based on elasticity.