JPH0754912A - Controllable mount of liquid encapsulated type - Google Patents

Abstract

PURPOSE:To reduce the dynamic spring constant in wide frequency ranges by forming a bevel-shaped member so that the rigidity of the member itself can be changed. CONSTITUTION:One end in vertical direction of a supporting cylinder 8 is coupled with the car body side while a mounting member 3 is coupled with the other end through a resilient bearing piece 4, and this is coupled with the engine side. The inside liquid chamber 9 is partitioned by a partitioning member 6 into a pressure receiving chamber 9a and an equilibrium chamber 9b, and the two are put in communication through an orifice 12. A bevel-shaped member 7 is installed on the mounting member in such a way as protruding to the pressure receiving chamber side. This bevel-shaped member is formed from an upper and a lower resilient diaphragm member where an electroviscous liquid E is encapsulated in the inside, and the diaphragm members are made from an electroconductive rubber so that electrodes 18, 19 are accomplished. The impressed voltage is controlled by a control means 26 so that the rigidity of the bevel-shaped member is changed, and thereby the frequency range where a ruduction of the dynamic spring constant occurs s varied.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a liquid-filled mount used as, for example, an automobile engine mount,
More specifically, the present invention relates to a control liquid-filled mount that includes a bulky member and can change the rigidity of the bulky support member.

[0002]

2. Description of the Related Art Conventionally, in liquid-filled mounts,
As a measure against each vibration of low frequency and high frequency, it is often the case that the liquid chamber is divided into a pressure receiving chamber and a equilibrium chamber by a partition plate and both chambers are communicated with an orifice, and a pressure receiving chamber is provided with a cap member. Are known. In this device, damping is achieved by the flow of the liquid through the orifice at the time of low frequency vibration input, and the liquid is passed through the gap between the bulk member and the mount body, which is generated by the relative movement of the bulk member at the time of high frequency vibration input. The flow of the liquid is intended to reduce the dynamic spring constant. And as an improved version of this type, a controllable liquid is formed by covering one surface of the above-mentioned bulky member with a diaphragm film to form an air chamber sealed inside, and controlling the internal pressure of this air chamber. An enclosed mount has been proposed (see Japanese Utility Model Laid-Open No. 3-12639). In this structure, pressure changing means for changing the internal pressure of the air chamber is provided, and the diaphragm film is bulged or recessed toward the pressure receiving chamber by changing the internal pressure.

On the other hand, a partition plate for partitioning the liquid chamber into a pressure receiving chamber and an equilibrium chamber is provided inside in order to reduce the dynamic spring constant at the time of high frequency vibration input by using an electrorheological liquid instead of using a bulky member. It has been proposed that a closed space is formed of a rubber film and an electrorheological liquid is enclosed in the closed space (see Japanese Patent Laid-Open No. 3-168437). In this product, a voltage is applied to the electrorheological liquid in the low frequency range to harden the partition plate to obtain the original damping effect of the orifice, and the application of the voltage is stopped in the high frequency range to soften the partition plate. The volume of the pressure receiving chamber can be changed.

[0004]

However, in the case where the above-mentioned simple bulk member is provided, since the bulk member is usually made of a metal and is a rigid body, the above-mentioned effect of reducing the dynamic spring constant is obtained. Can be obtained only for vibrations in a specific frequency range, and the effect of reducing the dynamic spring constant cannot be effectively obtained for vibrations in other frequency ranges.

Further, in the conventional control type liquid-filled mount in which the air chamber is formed in the above-mentioned bulky member, the diaphragm film bulges or dents toward the pressure receiving chamber side due to the internal pressure control, that is, the bulky shape. Since the volume of the air chamber in the member changes, as a result of the internal pressure control of the air chamber, the hydraulic pressure in the pressure receiving chamber changes. Therefore, if the internal pressure is changed in the low frequency region, the flow rate of the liquid passing through the orifice that connects the pressure receiving chamber and the equilibrium chamber is changed, and it is necessary to tune in consideration of such an influence. Tuning becomes troublesome. On the other hand, even if the internal pressure is changed in the high frequency range, it is only possible to absorb the change in the liquid pressure in the pressure receiving chamber corresponding to the change in the volume of the air chamber, and the rigidity of the bulk member itself does not change. It cannot be expected that the frequency range will be changed or expanded to reduce the noise. In addition, when a composite input of high frequency vibration and low frequency vibration acts, it becomes extremely difficult to control each vibration independently.

Further, in the case where the partition plate is formed of a rubber film and the electrorheological liquid is sealed inside, the liquid pressure rise in the pressure receiving chamber is made possible by allowing the volume change of the pressure receiving chamber in the high frequency range. It is only possible to suppress the sudden increase of the dynamic spring constant, and it is not intended to actively reduce the dynamic spring constant in the high frequency range, and the controllable frequency range is relatively narrow depending on the diameter of the partition plate. Limited to

The present invention has been made in view of the above circumstances, and an object thereof is a frequency range in which the dynamic spring constant can be reduced by changing the rigidity of the bulky member itself. Is to be changed to reduce the dynamic spring constant in a wide frequency range.

[0008]

In order to achieve the above object, the invention according to claim 1 provides a mounting member disposed on one side in the vibration input direction and a support disposed on the other side in the vibration input direction. A cylindrical body, an elastic support body that connects the support cylindrical body and the mounting member to each other, a pressure receiving chamber in which liquid is enclosed in the elastic support body and receives pressure due to deformation of the elastic support body, and an elastic diaphragm partly An equilibrium chamber which is partitioned by a member and communicates with the pressure receiving chamber through an orifice, and a base end side of which is attached to the mounting member so that a tip end side thereof projects into the pressure receiving chamber in a vibration input direction and an outer peripheral portion of the pressure receiving chamber. It is premised on the one having a bulky member that expands to the inner peripheral surface side of the. In this structure, as the above-mentioned bulky member, at least a part of both surfaces in the vibration input direction is a closed space defined by elastic films, respectively, and a pair is disposed so as to face the closed space and face each other to form an electric field. And an electrorheological liquid whose viscosity is changed by the electric field and which is enclosed in the closed space,
The rigidity in the vibration input direction changes according to the change in viscosity.

According to a second aspect of the invention, in the first aspect of the invention, a control means for controlling the voltage applied to the electrode according to the frequency of the input vibration is provided.

According to a third aspect of the invention, in the first aspect of the invention, the bulky member is composed of a first disc-shaped elastic film member and a second disc-shaped elastic film member. However, the outer peripheral edges of both are connected to each other.

Furthermore, the invention of claim 4 is the same as claim 1.
In the invention described above, the elastic film of the bulky member is made of conductive rubber, and the electrode is made of this conductive rubber.

[0012]

With the above construction, in the invention according to claim 1,
When the voltage applied to the electrodes is changed, the viscosity of the electrorheological liquid in the bulk member changes, and the rigidity of the entire bulk member changes. As a result, the flexibility of the outer peripheral portion of the bulky member changes when the bulky member moves relative to the vibration input. For example, when a high voltage is applied to the electrorheological liquid,
The entire cap member becomes hard and moves relatively in phase with the vibration input from the mounting member, causing liquid flow in the pressure receiving chamber through the gap between the outer peripheral edge of the cap member and the inner surface of the pressure receiving chamber, causing the orifice to be clogged. The dynamic spring constant can be reduced with respect to high-frequency vibration that causes the state. Then, when the applied voltage is reduced, the viscosity of the electrorheological liquid is lowered and the bulky member becomes soft, that is, the rigidity (elastic coefficient) of the bulky member is lowered, and the deflection of the outer peripheral edge of the bulky member is reduced. The degree increases and a phase difference is generated during relative movement. Along with this, the flow velocity of the liquid passing through the gap changes and the resonance frequency changes. As a result, the frequency at which the effect of reducing the dynamic spring constant by the bulky member is changed.

According to the second aspect of the present invention, in addition to the action of the first aspect of the present invention, since the applied voltage is changed by the control means according to the frequency of the input vibration, high frequency vibrations in various frequency ranges are generated. On the other hand, while reducing the dynamic spring constant, high damping is achieved by liquid column resonance of the liquid passing through the gap between the outer peripheral edge of the bulky member and the inner surface of the pressure receiving chamber by applying a high voltage to low frequency vibration. .

In addition, in the invention described in claim 3, in addition to the operation according to the invention described in claim 1, since the entire bulky member is formed by the elastic film, the voltage applied to the electrorheological liquid is changed. This directly leads to a change in the rigidity of the entire umbrella-shaped member, which facilitates and ensures the change and expansion of the frequency range in which the effect of reducing the dynamic spring constant is produced.

Further, according to the invention described in claim 4, in addition to the operation according to the invention described in claim 1, since the bulky member and the electrode are simultaneously formed by the conductive rubber, the bulky member can be easily formed. Be promoted.

[0016]

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 shows a controllable liquid-filled mount according to the first embodiment of the present invention, in which the cylinder axis X is oriented in the vibration input direction (vertical direction in FIG. 1; hereinafter simply referred to as vertical direction). A support cylinder member 2, a cup-shaped member having a bottom for closing the lower end opening side of the support cylinder member 1, and a position 3 on the upper end opening side of the support cylinder member 1 are arranged on the cylinder axis X. An attachment member 4, an annular elastic support member that connects the attachment member 3 and the support cylinder member 1 to each other, 5 a diaphragm made of a rubber thin film as an elastic diaphragm member, 6 a partition member, and 7 a cap member. is there.

The support cylinder member 1 and the cup-shaped member 2 are
Caulked portion 1a constituted by the lower end edge of the support cylinder member 1
These are connected to each other, and the support cylinder 8 having a bottomed cylindrical shape is constituted by these 1 and 2. And
By a connecting bolt 2a which is fixed to the cup-shaped member 2 so as to project downward, it is connected to the vibration receiving portion, for example, the vehicle body side. A rubber thin film 4a extending from the elastic support 4 is vulcanized and adhered to the inner peripheral surface of the caulked portion 1a, and the rubber thin film 4a seals the caulked portion 1a. In addition, the caulked portion 1a includes the cup-shaped member 2
The outer peripheral edge of the diaphragm 5 and the outer peripheral edge of the partition body 6 are positionally fixed together with the outer peripheral edge of, and ethylene glycol or the like is placed in the closed space partitioned by the diaphragm 5, the elastic support body 4 and the support cylinder member 1. The liquid chamber 9 is formed by enclosing the incompressible liquid L having a relatively low viscosity. The liquid chamber 9 is divided into two by the partition body 6, the pressure receiving chamber 9a is formed on the upper side of the partition body 6, and the equilibrium chamber 9b is formed on the lower side.

The mounting member 3 includes a plate member 3a, a connecting bolt 3b protruding upward from the plate member 3a along the cylinder axis X, and a bottomed cylindrical member 3c protruding downward from the plate member 3a. It consists of The mounting member 3 is connected to the vibration source side, for example, the engine side, via the connecting bolt 3b. Further, the elastic support body 4 is formed in a truncated cone shape by integral vulcanization molding of rubber between the outer peripheral surface of the cylindrical member 3c and the inner peripheral surface of the upper opening edge 1b of the support cylindrical body 8.
The mounting member 3 is elastically supported by the elastic supporting body 4 with respect to the supporting cylindrical body 8.

The partition body 6 is formed inside a storage chamber 10 formed inside the central portion, a movable plate 11 accommodated in the storage chamber 10 so as to be capable of fine vertical displacement, and inside the outer peripheral portion. And an annular orifice 12. One end of the orifice 12 is opened to the pressure receiving chamber 9a and the other end is opened to the equilibrium chamber 9b, so that the liquids L in the pressure receiving chamber 9a and the equilibrium chamber 9b can flow to each other through the orifice 12. The length and cross-sectional area of the orifice 12 are set so as to attenuate the vibration of a predetermined low frequency range input in the vertical direction due to the resonance of the liquid column when the liquid L flows. Further, the storage chamber 10 is communicated with each of the pressure receiving chamber 9a and the equilibrium chamber 9b by a plurality of communication holes 13, 13, ... And the movable plate 11 is slightly displaced due to the hydraulic pressure fluctuation from the pressure receiving chamber 9a. By causing the volume of the pressure receiving chamber 9a to change, the volume of the pressure receiving chamber 9a is compensated, that is, the volume of the pressure receiving chamber 9a is changed particularly with respect to high frequency vibration. The orifice 12 is formed on the outer peripheral portion of a pair of hat-shaped plate-like bodies 14 and 15 that are vertically stacked so as to have a C-shape in a plan view. Is formed between the facing surfaces of a pair of plate bodies 16 and 17 which are fitted in the through holes at the central portions of the plate bodies 14 and 15 from the up and down direction and coupled to each other.

As shown in detail in FIG. 2, the bulky member 7 is a reverse bowl-shaped upper member 18 serving as a first electrode, and a disc-shaped member serving as a second electrode that shields the lower surface of the upper member 18. The lower member 19 and the donut-shaped insulator 20 interposed between the outer peripheral portions of the two members 18 and 19 to insulate the two members 18 and 19 from each other are defined by the two members 18 and 19. The pair of electrodes 18, 1 enclosed in a closed space 21
And an electrorheological fluid (E) whose viscosity is changed by the electric field formed by 9. The pressure receiving chamber 9a is divided into an upper liquid chamber portion 9c and a lower liquid chamber portion 9d by the umbrella member 7, and both liquid chamber portions 9c and 9d are formed between the outer peripheral portion of the umbrella member 7 and the pressure receiving chamber 9a. It communicates with the inner circumferential surface through an annular gap 22.

The upper member 18 is made of a central metal base plate 18a forming a base end and a disk-shaped conductive rubber vulcanized and bonded to the outer periphery of the base plate 18a by integral vulcanization molding. The elastic film member 18b. The base plate 18a is fixed to the lower surface of the bottomed tubular member 3c via a bolt 23, and the reinforcing ring 18c is embedded in the outer peripheral portion of the lower end of the elastic film member 18b by integral vulcanization molding. .

The lower member 19 is made of a metal-made substrate 19a for connecting a conductor at the center and an elastic member made of a conductive rubber in the form of a disk vulcanized and bonded to the outer periphery of the substrate 19a by integral vulcanization molding. It is composed of a film member 19b. The outer peripheral edge of the elastic film member 19b is vulcanized and bonded to the lower surface of the insulator 20 together with the substrate 19a by integral vulcanization molding.

The outer periphery of the insulator 20 is bent upward, and the elastic film member 1 is located at the position of the reinforcing ring 18c.
The lower member 19 and the upper member 18 are integrally coupled to each other by being fitted and press-fitted on the outer peripheral surface of 8b.

The substrate 19a of the lower member 19 is connected to the power supply 25 by a conductor 24a arranged through the connecting bolt 3b, the bottomed tubular member 3c and the bolt 21, and the substrate 18a of the upper member. Is a bottomed tubular member 3
c, the plate member 3a, and the lead wire 24b connected to the plate member 3a, grounded to the vehicle body side and connected to the power source 25. Then, from the power source 25 to the control means 26
A predetermined voltage is applied by the elastic film member 19 on the lower side.
A predetermined electric field is formed between b and the elastic film member 18b on the upper side, and this electric field controls the electroviscous liquid E to a predetermined viscosity. That is, the control means 26 controls the applied voltage according to the frequency of the input vibration so as to control the rigidity of the bulky member 7, and the mounting member 3 when the bulky member 7 is relatively moved in the vertical direction.
The degree of deflection of the outer peripheral portion of the bulky member 7 is set to a predetermined value.

The control means 26 controls the applied voltage particularly for high frequency vibration input, and each elastic film member 18b is at the highest frequency in the input high frequency vibration frequency range. , 19b have the highest voltage value within the range in which they can exhibit flexibility, and the voltage value is made lower as the frequency becomes lower. That is, even in the high frequency region, the applied voltage is lowered to reduce the viscosity of the electrorheological liquid E to soften the elastic film members 18b and 19b above and below the bulky member 7, while the high side in the high frequency region also By increasing the applied voltage to increase the viscosity of the electrorheological liquid E, the elastic film members 18b and 19b are relatively hardened.

Next, the operation and effect of the first embodiment having the above structure will be described.

In the liquid-filled mount, the connecting bolt 2a on one side in the vertical direction is, for example, on the vehicle body side, and the connecting bolt 3 on the other side.
a is connected to the engine side, for example.

When the vertical low-frequency vibration is input from the mounting member 3 mounted on the side of the vibration source and the elastic support body 4 is bent and the mounting member 3 is displaced downward, the pressure receiving chamber 9a. Is reduced and the liquid L inside flows through the orifice 12 to the equilibrium chamber 9b side. With the flow of the liquid L, liquid column resonance via the orifice 12 can be effectively generated, and the liquid column resonance can attenuate the input vibration in the low frequency region.

On the other hand, when the vibration input from the mounting member 3 is on the higher frequency side and a clogging state in which the flow of the liquid L through the orifice 12 is substantially not generated, the elastic support 4 Is bent downward, the hydraulic pressure in the pressure receiving chamber 9a rises. At this time, since the bulky member 7 is displaced in the vertical direction together with the mounting member 3 and the upper liquid chamber 9c expands and contracts, the lower liquid chamber 9d and the upper liquid chamber 9c pass through the annular gap 22 in the pressure receiving chamber 9a. A flow of the liquid L occurs between and. At this time, a predetermined voltage is applied to both electrodes 18 and 19 to control the electroviscous liquid E to a predetermined viscosity, and the rigidity of the bulky member 7 corresponds to this viscosity, and the upper and lower elasticity The film members 18b and 19b have a predetermined flexibility. Therefore, during the flow, the upper elastic film member 18b bends inward under the hydraulic pressure of the liquid L flowing from the lower liquid chamber portion 9d into the upper liquid chamber portion 9c, and the hydraulic pressure is absorbed. On the other hand, the lower elastic film member 19b bends outward. On the contrary, the elastic film member 19b on the lower side bends inward under the hydraulic pressure of the liquid L flowing from the upper liquid chamber portion 9c into the lower liquid chamber portion 9d, and the hydraulic pressure is absorbed, while The elastic film member 18b bends outward. As a result of the flow of the liquid L in the pressure receiving chamber 9a and the absorption of the hydraulic pressure by the elastic film members 18b and 19b, in the case of the conventional umbrella-shaped member formed by simple metal fittings (see the broken line in FIG. 3). Compared with the above, it is possible to prevent the increase of the dynamic spring constant at the time of high frequency vibration input, and further to positively reduce the dynamic spring constant (see the dashed line in the same figure). At this time, even if the bulky member 7 bends, the volume of the electrorheological liquid E inside is constant irrespective of whether or not a voltage is applied and whether the applied voltage is high or low. No incremental fluctuations occur.

Then, the voltage applied to each of the electrodes 18 and 19 is changed and controlled by the control means 26 in accordance with the frequency of the high frequency vibration inputted. Along with the change in the applied voltage, the degree of deflection of the bulky member 7 changes and a phase difference occurs during relative movement, the flow velocity of the liquid L passing through the annular gap 22 changes, and the resonance frequency changes. As a result, the frequency at which the effect of reducing the dynamic spring constant by the bulky member 7 is changed. Then, for example, as shown in FIG. 3, as the frequency becomes higher in a high frequency region (for example, a region where engine muffled noise is generated), the bottoming portion (reduction portion) of the dynamic spring constant due to the resonance of the cap-shaped member 7 has a higher frequency Applied voltage to move to V
1, V2, V3 (V1 <V2 <V3) are continuously changed to the increasing side, so that the applied voltage V1 shown by the one-dot chain line is changed.
The bottoming part of the dynamic spring constant due to, the bottoming part due to the applied voltage V2 shown by the two-dot chain line, and the bottoming part due to the applied voltage V3 shown by the three-dot chain line become the continuous spring constant (see the solid line indicated by Kd). The reduction range of the spring constant can be expanded to a wide frequency range.

Next, a case will be described in which the first embodiment having the above-mentioned configuration is used to achieve damping when a low frequency vibration is input. In this case, it is preferable to use a relatively viscous liquid such as silicone oil as the liquid L sealed in the liquid chamber 9.

When a low-frequency vibration such as an engine shake or an acceleration / deceleration shock is input from the side of the mounting member 3, by applying a high voltage to the electrorheological liquid E in the cap-shaped member 7, the above-mentioned cap-shaped member is formed. The member 7 has a hardness close to that of a rigid body. This causes the liquid L to flow between the upper liquid chamber portion 9c and the lower liquid chamber portion 9d passing through the annular gap 22 in the pressure receiving chamber 9c as the bulky member 7 moves in the vertical direction. Therefore, when no voltage is applied to the electrorheological liquid E (see the alternate long and short dash line in FIG. 4), in the case of applying the above voltage, the liquid column resonance of the liquid passing through the annular gap 22 prevents the low frequency vibration. High damping can be obtained (see the solid line in the figure). Therefore, the liquid column resonance of the liquid passing through the annular gap 22 attenuates it in the low frequency region which is attenuated by the liquid column resonance between the pressure receiving chamber 9a and the equilibrium chamber 9b accompanying the flow of the liquid L through the orifice 12. By adding a low frequency range, the attenuation range of low frequency vibration can be expanded.

FIG. 5 shows an umbrella member 27 used in the control type liquid-filled mount according to the second embodiment. The second embodiment is different only in the bulky member 7 of the first embodiment, and the other configurations are the same. Therefore, only the above-mentioned bulky member 27 having a configuration different from that of the first embodiment will be described below. The first
The same members as those in the embodiment are designated by the same reference numerals, and the description thereof will be omitted.

The umbrella-shaped member 27 is an inverted bowl-shaped upper member 28, a disk-shaped lower member 29 that shields the lower surface of the upper member 28, the outer peripheral edge of the lower member 29, and the upper member 28. An annular insulator 30 interposed between the outer periphery of the
Closed space 21 defined by both members 28, 29
And an electrorheological liquid E sealed in.

The upper member 28 has a main body 28a as a first electrode formed by bending a metal plate into a predetermined shape.
The elastic film 28b integrally vulcanized and molded is formed in each of a plurality of opening windows formed through the peripheral surface of the main body 28a. The lower member 29 is composed of a metallic substrate 29a arranged at the center position and an elastic film member 29b as a second electrode made of conductive rubber vulcanized and bonded to the substrate 29a by integral vulcanization molding. Become. Then, this elastic film member 2
The outer peripheral edge of 9b and the inner peripheral surface of the insulator 30 are vulcanized and bonded by integral vulcanization molding, and the outer peripheral surface of the insulator 30 is fitted into the inner peripheral surface of the main body portion 28a to form the lower member 29. And the upper member 28 are integrally connected.

In the case of the second embodiment, the main body 2
Since 8a is a rigid body, even if the applied voltage to the electrorheological liquid E is changed, the outer peripheral part of the bulky member 27 does not bend, but the elastic film 28b of the opening window and the elastic film member 2 on the lower side are not generated.
The flexibility with 9b changes. Therefore, the annular gap 22
(See FIG. 1) Through the lower liquid chamber 9d to the upper liquid chamber 9
While the elastic film 28b is bent inward by the inflow of the liquid L into the c, the lower elastic film member 29b is bent outward to absorb the hydraulic pressure and exert the effect of reducing the dynamic spring constant.
The same operation as the embodiment will be performed. Therefore, in the case of the second embodiment, the upper member 1 has a function of absorbing hydraulic pressure.
Although the entire circumference of 8 is composed of the elastic film member 18b and the entire outer peripheral portion is bent, the degree is slightly inferior to the first embodiment,
By adjusting the voltage applied to the electrorheological liquid E, the dynamic spring constant can be reduced more actively as compared with the conventional device as in the first embodiment, and the reduction range can be expanded to a wide frequency range. Can be planned.

The present invention is not limited to the first and second embodiments described above, but includes various other modifications. That is, in the first and second embodiments, the substrates 19a and 29a are used for connecting the conductive wires 24a, but the present invention is not limited to this, and the conductive wires 24a are connected to the elastic film members 19b and 29b which are conductive rubbers. May be directly connected.

In the first and second embodiments, the lower member 1
Although substantially the entire surfaces of 9 and 29 are configured by the elastic film members 19b and 29b, the invention is not limited to this, and at least a part of each of the upper and lower members may be formed of an elastic film.

In the first embodiment, the pair of electrodes are made of conductive rubber elastic film members 18b and 19b. In the second embodiment, the lower electrode is made of conductive rubber elastic film member 29b.
However, the present invention is not limited to this, and the pair of electrodes may be composed of metallic electrodes other than the elastic film.
In this case, the insulators 20 and 3 in the first and second embodiments are formed by connecting the upper and lower members with an elastic film.
It is possible to omit 0.

Further, in the first and second embodiments,
Although it has been described that the mounting member 3 is connected to the engine as the vibration source and the cup-shaped member 2 is connected to the vehicle body as the vibration receiving portion, the present invention is not limited to this, and may be reversed upside down, for example. Even in this case, the same effect can be obtained.

[0042]

As described above, according to the control type liquid mount of the first aspect of the invention, at least a part of both sides of the bulky member in the vibration input direction are formed of elastic films, respectively, and the electrorheological liquid is formed inside. Since the cap-shaped member is formed by defining a closed space in which the cap-shaped member is enclosed, when the cap-shaped member is relatively moved by the input of high-frequency vibration that causes the orifice to be in a so-called clogging state, In addition to preventing the increase of the dynamic spring constant due to the flow of the liquid in the pressure receiving chamber passing through the gap between the outer peripheral edge of the pressure receiving chamber and the peripheral surface of the pressure receiving chamber, the hydraulic film is absorbed by the bending of the elastic film to positively increase the dynamic spring constant. It can be reduced. Moreover, since the viscosity of the electrorheological liquid can be changed by applying a voltage to the pair of electrodes to change the rigidity of the bulky member, the resonance frequency of the bulky member can be made variable, As a result, the frequency range in which the effect of reducing the dynamic spring constant by the bulky member is generated can be changed, and the dynamic spring constant can be reduced in a wide frequency range.

According to the second aspect of the invention, in addition to the effect of the first aspect of the invention, since the applied voltage is changed by the control means according to the frequency of the input vibration, the low frequency vibration can be prevented. High damping can be obtained by applying a high voltage, and the range of reduction of the dynamic spring constant can be expanded by continuously changing the applied voltage with respect to high frequency vibration. Can be surely obtained.

According to the invention of claim 3, in addition to the effect of the invention of claim 1, since the entire bulky member is formed of an elastic film, the voltage applied to the electrorheological liquid is Is directly connected to the change in rigidity of the entire bulky member, and the frequency range in which the dynamic spring constant reducing effect is produced can be changed easily and surely.

Further, according to the invention of claim 4, in addition to the effect of the invention of claim 1, since the bulky member and the electrode are simultaneously formed by the conductive rubber, the bulky member is formed. Can be facilitated.

[Brief description of drawings]

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

2 is an enlarged view of the bulky member of FIG. 1. FIG.

FIG. 3 is a relationship diagram between a frequency and a dynamic spring constant.

FIG. 4 is a relationship diagram between frequency and attenuation characteristics.

FIG. 5 is a partially omitted sectional view showing a bulky member according to a second embodiment.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Support cylinder 3 Mounting member 4 Elastic support 5 Diaphragm (elastic diaphragm member) 7,27 Bulk member 8 Support cylinder 9a Pressure receiving chamber 9b Equilibrium chamber 12 Orifice 18b, 19b Elastic film member (elastic film, conductive rubber) 21 Closed Space 18 Upper Member (Electrode) 19 Lower Member (Electrode) 26 Control Means 28a Main Body (Electrode) 28b Elastic Membrane 29b Elastic Membrane Member (Elastic Membrane) 29 Lower Member (Electrode) E Electrorheological Liquid L Liquid

Claims (4)

[Claims] 1. A mounting member arranged on one side in the vibration input direction, a support cylinder arranged on the other side in the vibration input direction, and an elastic bearing for connecting the support cylinder and the mounting member to each other. A pressure receiving chamber in which liquid is enclosed in the elastic bearing and receives pressure due to the deformation of the elastic bearing, and a balance chamber partially partitioned by the elastic diaphragm member to communicate with the pressure receiving chamber through an orifice, In a liquid-filled mount, the base end side of which is attached to the mounting member, the tip end side of which protrudes into the pressure receiving chamber in the vibration input direction, and the outer peripheral portion of which extends to the inner peripheral surface side of the pressure receiving chamber. The above-mentioned umbrella-shaped member is a sealed space in which at least a part of both surfaces in the vibration input direction is defined by elastic films, respectively, and a pair of electrodes which are arranged so as to face each other and face each other to form an electric field, Enclosed in the enclosed space And an electro-rheological fluid that changes viscosity by the field Te, controlled fluid-filled mount which is characterized by being configured to vary the rigidity of the vibration input direction by a change in the viscosity. 2. The controllable liquid-filled mount according to claim 1, further comprising control means for controlling the voltage applied to the electrodes according to the frequency of the input vibration. 3. The bulky member according to claim 1, wherein the bulky member comprises a first disk-shaped elastic film member and a second disk-shaped elastic film member, and the outer peripheral edges of both are connected to each other. Controlled liquid fill mount being formed. 4. The controllable liquid-filled mount according to claim 1, wherein the elastic film of the bulky member is made of conductive rubber, and the electrode is made of the conductive rubber.