JPH0783275A - Liquid sealed type engine mount - Google Patents

Abstract

PURPOSE:To convert the frequency scope to exercise the damping characteristics in a broad scope, to make the assembly easy, and to reduce the number of parts, by converting the flowable section area of an electric viscous fluid in a communicating passage by converting the applying voltage. CONSTITUTION:The first and the second supports 1 and 2 are connected each other by an elastic holder 3, and an electric viscous fluid E is sealed in a liquid chamber 5 between the supports and a diaphragm 4. The liquid chamber 5 is partitioned into a pressure receiver chamber 5a and a balancer chamber 5b by a partition body 6. The partition body 6 is formed of a pair of electrode plates 10 and 11 superposed each other, and the relatively opposing surfaces of them are cut off by an insulating member 12 so as to partition a communicating passage 13 to communicate the pressure receiver chamber 5a and the balancer chamber 5b. The section form of the communicating passage 13 is made in plural stages of recessed groove form, the interval between the opposing surfaces of the pair of electrode plates 10 and 11 is converted in three stages, and the flowable section area of the electric viscous fluid in the communicating passage is converted by stages by the stage control of the applying voltage, so as to convert the resonance frequency by stages. In this case, the conversion of the interval of the opposing surfaces may be made in no stage conversion, and furthermore, the conversion may be made to proportion the increase of the voltage and the decrease of the flowable section area.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention is used, for example, in an automobile engine mount and the like, in which a liquid-filled engine mount in which an electrorheological fluid is enclosed and whose vibration damping characteristics can be changed and controlled depending on the magnitude of an applied voltage. Regarding

[0002]

2. Description of the Related Art Conventionally, as a liquid-filled mount of this type, a liquid chamber containing an electrorheological fluid is divided into a pressure-receiving chamber and a balance chamber by a partition body formed by stacking two plate members, and this partition is also used. A gap between the plate members of the body constitutes a communication passage that communicates the pressure receiving chamber and the equilibrium chamber with each other, and a pair of electrodes are disposed on the inner surface of the communication passage so as to face each other, and the electricity passing through the communication passage is formed. It is known to change and control the viscosity of a viscous fluid (for example, JP-A-60-10).
(See Japanese Patent No. 4828).

On the other hand, in the above-mentioned one, since the distance between the electrodes in the communication passage is constant only by changing the applied voltage, the range of vibration-proof characteristics that can be changed is narrow. Shake vibration (10
20Hz vibration) and idle vibration (20-30
Since it is difficult to achieve both the vibration prevention (Hz vibration) and the vibration isolation, it is necessary to provide a first orifice in which a pair of electrodes are arranged opposite to each other on the inner wall surface of the partition body that constitutes the communication passage, and such an electrode. It is known that a second orifice that is not arranged is formed (see, for example, Japanese Patent Application Laid-Open No. 1-112044). In this structure, the partition body is formed by superposing two plate members made of an electrically insulating resin so as to be spaced apart from each other to form a communication path between the facing surfaces of the plate members. The first orifice is formed by disposing the electrode in a part between the facing surfaces, and the second orifice is formed so that the electrode is not arranged in the other portion. The cross-sectional area in which the electrorheological fluid flows can be controlled to be switched depending on whether or not the electrode is energized, that is, the cross-sectional area of the second orifice only or both of the first and second orifices.

[0004]

However, in the conventional liquid-filled mount described above, the partition body has the above-mentioned first structure.
Further, in order to form the second orifice, it is necessary to fix the electrodes only in respective predetermined ranges of the two plate members made of the electrically insulating resin, and then, both the plate members are piled up, which requires a troublesome assembly work. However, there is a problem that the structure is complicated and the number of parts is increased.

On the other hand, it is conceivable that the two plate members are made of an electrode forming material instead of an electrically insulating resin and the above electrodes are omitted. However, by doing so, the number of parts can be reduced. However, the original purpose of changing and controlling the flowable range of the electrorheological fluid by applying a voltage cannot be obtained.

The present invention has been made in view of such circumstances, and an object thereof is to make it possible to change the flowable cross-sectional area of the electrorheological fluid in the communication passage depending on the magnitude of the applied voltage. By doing so, it is possible to make a wide range of changes in the frequency range exhibiting the vibration damping characteristics, and also to realize this with a simple structure to facilitate the assembly and reduce the number of parts.

[0007]

In order to achieve the above object, the invention according to claim 1 is a first and a second support bodies which are arranged at a predetermined distance in the vibration input direction, and these first and second support bodies. And an elastic bearing that connects the second supports to each other,
A liquid chamber in which one side of the vibration input direction is defined by the elastic support and the other side is defined by an elastic diaphragm member and an electrorheological fluid is sealed inside, and this liquid chamber receives pressure on the side of the elastic support. It is premised that a partition body is provided to partition the chamber and the equilibrium chamber on the side of the elastic diaphragm member, and a communication passage formed in the partition body to connect the pressure receiving chamber and the equilibrium chamber to each other. In this structure, the partition bodies are superposed on each other at a predetermined interval and form a pair of electrode plates that form the communication path between the facing surfaces, and the facing surfaces of the pair of electrode plates are cut off from each other. And an insulating member that defines a communication path. And, in the communication passage, the facing surface spacing of the pair of electrode plates in the communication passage is in a direction orthogonal to the flow direction of the electrorheological fluid passing through the communication passage,
The cross-sectional shape changes from a distance at which the electrorheological fluid is solidified by the electric field strength formed by applying a voltage to a distance at which the viscosity of the electrorheological fluid does not substantially change.

According to a second aspect of the present invention, in the first aspect of the invention, the interval between the facing surfaces of the pair of electrode plates in the communication passage is set so as to be changed stepwise in a plurality of steps. .

According to a third aspect of the present invention, in the first aspect of the invention, the interval between the facing surfaces of the pair of electrode plates in the communication passage is set so as to be changed steplessly.

Further, the invention according to claim 4 is the same as claim 1.
In the invention described above, the changing state of the facing surface spacing is set so that the increment of the voltage applied to the pair of electrode plates and the decrement of the flowable cross-sectional area of the electrorheological fluid in the communication passage have a proportional relationship. It is to be configured.

[0011]

With the above construction, in the invention according to claim 1,
Since the strength of the electric field formed between the facing surfaces by applying a voltage to the pair of electrode plates is inversely proportional to the distance between the facing surfaces, the electric field strength between the two electrode plates in the cross-sectional direction of the communication path is the distance between the facing surfaces. Is smaller, the larger is, and the larger is the distance between the facing surfaces, the smaller is. Therefore, in the cross-section of the communication passage, the electrorheological fluid is thickened and does not flow in the region on the side where the phase facing surface spacing is small, whereas it is not flown on the side where the phase facing surface spacing is large. The fluid flows without substantially changing the viscosity of the fluid. Therefore, by controlling the magnitude of the applied voltage, the flowable cross-sectional area of the electrorheological fluid in the communication passage is changed, thereby changing the resonance frequency that causes damping. Further, since the above-mentioned communication path is formed by simply stacking a pair of electrode plates with an insulating member interposed therebetween, the assembling work is facilitated and the number of parts is reduced as compared with the conventional liquid-filled mount. Is planned.

According to the second aspect of the present invention, in addition to the operation of the first aspect of the present invention, the interval between the facing surfaces of the pair of electrode plates in the communication passage is changed stepwise in a plurality of steps. The flowable cross-sectional area of the electrorheological fluid can be changed stepwise by the stepwise control of the voltage, and the resonance frequency at which the damping occurs is also changed in the stepwise steps. This simplifies voltage control and
Anti-vibration performance can be reliably obtained in multiple frequency ranges.

Further, in the invention described in claim 3, in addition to the operation according to the invention described in claim 1, since the interval between the opposed faces of the pair of electrode plates in the communication passage is changed steplessly, the applied voltage is increased. By gradually changing, the flowable cross-sectional area of the electrorheological fluid changes correspondingly, and thereby the resonance frequency at which attenuation occurs also changes gradually. Therefore, it becomes possible to finely change the vibration isolation characteristics according to the frequency of the input vibration.

Further, according to the invention described in claim 4, in addition to the operation according to the invention described in claim 1, the state of change in the phase-to-phase surface spacing is linked to the increment of the voltage applied to the pair of electrode plates. Since the flowable cross-sectional area of the electrorheological fluid in the passage is set to decrease in proportion, the voltage applied to change the flowable cross-sectional area to change the desired resonance frequency Control becomes easy.

[0015]

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

FIG. 1 shows a liquid-filled mount according to a first embodiment of the present invention, in which 1 is a first support arranged at one side in the vibration input direction (upper side in the same figure), and 2 is this first support. The cylindrical second support 3 which is separated from the support 1 by a predetermined distance and is arranged on the other side (lower side in the figure) of the vibration input direction with the cylinder axis X directed toward the vibration input direction is the second support 2. And an annular elastic support 4 for connecting the first support 1 and the first support 1 to each other.
A diaphragm made of a rubber thin film as an elastic diaphragm member that forms a liquid chamber 5 between the liquid chamber 5 and
It is a partition body that is partitioned into a and 5b.

The first support 1 includes a plate member 1a, a connecting bolt 1b projecting upward from the plate member 1a along the cylinder axis X, and a bottomed cylindrical member projecting downward from the plate member 1a. 1c and. Then, the first support 1 is connected to the vibration source side, for example, the engine side, via the connecting bolt 1b. In addition, the elastic bearing body 3 is conical by the integral vulcanization molding of rubber between the outer peripheral surface of the cylindrical member 1c and the inner peripheral surface of the upper end opening edge 7a of the supporting cylindrical member 7 constituting the second supporting body 2. It is formed in a trapezoidal shape, and the elastic support 3 elastically supports the first support 1 with respect to the second support 2.

The second support 2 is the support cylinder member 7
A bottomed tubular cup-shaped member 8 arranged below the support tubular member 7, and a lower end flange portion 7 of the support tubular member 7.
, and fixing bolts 9, 9, ... For connecting and integrating the upper end flange portion 8a of the cup-shaped member 8 with each other, and the connecting bolt 8b fixed to the cup-shaped member 8 so as to project downward. Thus, the vibration receiving portion is connected to, for example, the vehicle body side. Then, the outer peripheral edge portion 6 of the partition body 6 is provided between the pair of flange portions 7b and 8a.
a and the outer peripheral edge portion of the diaphragm 4 are sandwiched and fixed in position by the fixing bolts 9, 9, ... In a closed space partitioned by the diaphragm 4, the elastic support member 3 and the support cylinder member 7. In addition, the electrorheological fluid (Electric Rheological Flui
d) The liquid chamber 5 is formed by enclosing E. The liquid chamber 5 is divided into two by the partition body 6, a pressure receiving chamber 5a that receives pressure due to the deformation of the elastic support body 3 is formed on the upper side of the partition body 6, and a balance chamber 5b is formed on the lower side. . A rubber thin film 3a extending from the elastic support 3 is vulcanized and adhered to the inner peripheral surface of the lower end flange 7b. The rubber thin film 3a and the diaphragm 4 form a partition 6 and a pair of flanges 7b. , 8a is sealed. Further, reference numeral 8c in the drawing denotes an air vent, which is opened in the peripheral wall portion of the cup-shaped member 8 to guarantee free deformation of the diaphragm 4.

The partition 6 includes a pair of upper and lower electrode plates 10 and 11 which are superposed on each other at a predetermined interval.
A donut plate shape made of silicon rubber or the like, which is interposed between the facing surfaces of the outer peripheral edge portions 6a of the pair of electrode plates 10 and 11 and insulates between the both 10, 11 and the fixing bolts 9, 9 ,. Insulating member 12 and this insulating member 1
2, the central portion 6 of the pair of electrode plates 10 and 11
and a communication passage 13 defined between the facing surfaces of b. The pair of electrode plates 10 and 11 are connected to a power source by the projecting pieces 10a and 11a projecting from different sides, and a predetermined voltage is applied.

As shown in FIGS. 2 and 3, the communication passage 13 opens into the pressure receiving chamber 5a at the crescent-shaped opening 10b at one side of the upper electrode plate 10 corresponding to the central portion 6b, and the lower side. The crescent-shaped opening 11b on the other side of the electrode plate 11 is formed so as to open to the equilibrium chamber 5b.
In addition, the pair of electrode plates 10 forming the communication path 13,
In the inner surface of the electrode plate 11 on the lower side, a stepped recessed groove portion 11c is continuously formed from the opening 10b to the opening 11b, and the recessed surface portion 11c forms the opposed surface. The vertical spacing between them is H1, H2, H3
(H1 <H2 <H3) three types of areas 13a, 13b,
13c is formed. The electrorheological fluid E in each of the regions 13a, 13b, 13c is applied to the pair of electrode plates 10, 11 by applying voltages V1, V2 (V1 <V1 <
The flow state is changed to the non-flow state by the switching control of V2). That is, the electrorheological fluid E
As shown in FIG. 4, as the electric field strength (applied voltage / vertical space) increases, the viscosity increases and shear stress increases. When the shear stress exceeds the boundary value δ, it solidifies and becomes a non-flowing state. Therefore, the applied voltage values V1 and V2 and the vertical gap values H1, H2, and H are based on the boundary electric field strength S that causes the shear stress having the boundary value δ.
3 is defined as follows.

When a voltage of V1 is applied, the first region 13
The electric field strength V1 / H1 formed in a and 13a becomes larger than the boundary electric field strength S, and therefore the first regions 1
While only 3a is in a non-flowing state, the second regions 13b, 1
3b and the electric field strength V1 / formed in the third region 13c
H2 and V1 / H3 are smaller than the boundary electric field strength S, and therefore the second and third regions 13b and 13c are formed.
The respective values V1, H1, H2 and H3 are set so as to make the flow state. Further, when the voltage value V2 is applied, the electric field intensities V2 / H1 and V2 / H2 formed in each of the first regions 13a and each of the second regions 13b become larger than the boundary electric field intensity S. 1 and each second area 1
3a, 13b are in a non-flowing state, while the third region 13c
The electric field strength V2 / H3 formed at the boundary is the boundary electric field strength S
Is smaller than that of the third region 13b, 13
Each value V2, H1, H2, so that only c is in a fluid state,
H3 is defined.

In addition, each of the second and third regions 13b in which the electrorheological fluid E flows when the voltage of the voltage value V1 is applied,
The cross-sectional area and length of 13c are set so as to cause liquid column resonance in the frequency range of idle vibration, and the cross-sectional area and length of the third region 13c in which the electrorheological fluid E flows when a voltage of the above voltage value V2 is applied. The length is set so as to cause liquid column resonance in the frequency range of shake vibration.

Then, the pair of electrode plates 10, 1
1, a voltage having a voltage value V2 is applied to the input vibration in a relatively low frequency range (for example, the frequency range of shake vibration), whereby the pressure receiving chamber 5a and the equilibrium chamber 5 are supplied.
The flow of the electrorheological fluid E with respect to b is performed only through the third region 13c in the communication passage 13, and this third region 13c
The liquid column resonance via c attenuates the input vibration in the low frequency range. Further, the voltage of the voltage value V1 is applied to the input vibration in the relatively high frequency range (for example, the frequency range of idle vibration), whereby the pressure between the pressure receiving chamber 5a and the equilibrium chamber 5b is increased. The flow of the electrorheological fluid E causes the second regions 13b, 13 in the communication passage 13 to flow.
b and the third region 13c, the liquid column resonance through the second and third regions 13b and 13c attenuates the input vibration in the high frequency range. Further, with respect to the input vibration on the higher frequency side, the voltage application is stopped, so that the flow of the electrorheological fluid E between the pressure receiving chamber 5a and the equilibrium chamber 5b is the above. The first to third regions 13a, 13b, and 13c are carried out through the large cross-sections to absorb a sudden increase in the internal pressure of the pressure receiving chamber 5a to reduce the dynamic spring constant.

Incidentally, such electrode plates 10, 11
Can be formed by cutting a metal material, casting, or molding using a conductive resin.

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

In the liquid-filled mount, the connecting bolts 1b on the upper and lower sides are connected to the engine side, for example, and the connecting bolts 8b on the other side are connected to the vehicle body side, for example.

Then, when a voltage value V2 is applied to the pair of electrode plates 10 and 11, an electric field is formed in the communication passage 13, and the first and second regions 13a and 13b are formed.
The viscosity of the electrorheological fluid E passing through is increased, and finally the electrorheological fluid E is brought into a non-flowing state in which the electrorheological fluid E does not substantially flow. On the other hand, the third region 13 of the communication passage 13
In c, even if the voltage of V2 is applied, the third region 13
The viscosity of the electrorheological fluid E passing through c does not substantially change, and the flow of the electrorheological fluid E between the pressure receiving chamber 5a and the equilibrium chamber 5b is performed only through the third region 13c. For this reason, the flowable disconnection range between the pressure receiving chamber 5a and the equilibrium chamber 5b is reduced, and accordingly, the frequency range where liquid column resonance occurs changes to the shake vibration range on the low frequency side as shown in FIG. To do. As a result, the shake vibration range is 10
High damping can be obtained for input vibrations in the frequency range of up to 20 Hz.

On the other hand, when the applied voltage is changed to the voltage value V1, the electric field strength generated in the communication passage 13 is changed to the voltage value V1.
It becomes smaller than the case of 2 by a predetermined amount, only each first region 13a is in a non-flowing state, each second region 13b and third region 13c is in a flowing state, and the flowable cross section of the electrorheological fluid E is enlarged. . Therefore, the frequency range in which the liquid column resonance occurs changes to the high frequency side, and as shown in FIG. 6, both the peak frequency in which attenuation occurs and the low value range of the dynamic spring constant are at the voltage value V2 (see FIG. 5). Change to high frequency side.
This makes it possible to obtain high damping with respect to the input vibration in the frequency range of 20 to 30 Hz which is the idle vibration range,
It is possible to reduce the dynamic spring constant.

Therefore, the communication path is controlled by stepwise switching control of the applied voltage value to the pair of electrode plates 10 and 11 according to the input vibration from the first support 1 mounted on the side of the vibration source. It is possible to change the resonance frequency of No. 13 and surely obtain the vibration isolation performance against the input vibration in two or more kinds of frequency ranges. In addition, the applied voltage can be controlled stepwise, and voltage control can be simplified.

Further, the communication passage 13 capable of obtaining the vibration-proof characteristic against the input vibrations of two or more kinds of frequency ranges is simply formed by superposing the pair of electrode plates 10 and 11 on each other through the insulating member 12. Can be formed at the same time when the partition 6 is formed by vulcanizing and adhering the insulating member 12 to one of the pair of electrode plates 10 and 11, and then stacking the other on top of this, so that the conventional electrorheological fluid is used. Compared to the case where the electrodes are provided facing each other at a predetermined position of a pair of plate members made of an electrically insulating resin as in the case of a liquid-filled mount, which is divided into a portion with electrodes and a portion without electrodes. It can be simplified, the assembling work can be facilitated, and the number of parts can be reduced. Then, the interval between the facing surfaces of the pair of electrode plates 10 and 11 is changed in three steps to change the first to third three regions 1
The flowable cross-sectional area of the electrorheological fluid E can be changed step by step for each of 3a, 13b, and 13c.
The resonance frequency at which attenuation occurs can be changed corresponding to the plurality of steps. Therefore, when vibrations in a plurality of specific frequency bands are input, it is possible to easily set the regions 13a, 13b, 13c in advance so as to correspond to the specific frequency bands. It is possible to surely obtain the switching of the anti-vibration characteristics with respect to the input vibration in the range and the anti-vibration performance with respect to each input vibration.

7 and 8 show a liquid-filled mount according to the second embodiment of the present invention, in which 14 is the liquid chamber 5 and the pressure receiving chamber 5 is shown.
a partition for partitioning into a and the equilibrium chamber 5b, and 16 for this partition 1
4 is a communication passage that connects the pressure receiving chamber 5a and the equilibrium chamber 5b to each other. The second embodiment differs from the first embodiment only in the construction of the partition body 6, and the other construction is the same as that of the first embodiment. Therefore, only the configuration of the partition body 14 of the second embodiment will be described below, and the same reference numerals are given to the same members in other configurations, and the description thereof will be omitted.

Similar to the partition body 6 of the first embodiment, the partition body 14 includes a pair of upper and lower electrode plates 10 and 15 which are superposed at a predetermined distance from each other, and the pair of electrode plates 10 and 15. Both of them are interposed between the facing surfaces
A donut plate-shaped insulating member 12 made of silicon rubber or the like for insulating between 0 and 15 and the fixing bolts 9, 9, ... The communication passage 16 is provided. The pair of electrode plates 10 and 15 are connected to a power source by projecting pieces projecting from different sides, and a predetermined voltage is applied.

The communication passage 16 is formed by the upper electrode plate 10
The crescent-shaped opening 1b on one side of the lower electrode plate 15 opens to the pressure receiving chamber 5a, and the crescent-shaped opening 1 on the other side of the lower electrode plate 15 opens.
5a is formed so as to open to the equilibrium chamber 5b. The opening 10 is formed on the inner surface of the lower electrode plate 15.
A groove portion 15b having a depth that gradually changes at a predetermined rate is formed between the opening b and the opening 15a in a direction orthogonal to the direction connecting the openings 10b and 15a, and the pair of electrode plates 10 is formed by the groove portion 15b. , 15 has a cross-sectional shape in which the vertical interval between the facing surfaces changes steplessly in a predetermined curve from a minimum value H4 corresponding to the thickness of the insulating member 12 to a maximum value H5.

The cross-sectional shape of the communication passage 16 constituted by the concave groove portion 15b and the inner surface of the flat plate-shaped upper electrode plate 10 facing the concave groove portion 15b is the same as the voltage applied to the pair of electrode plates 10 and 15. The region in which the electrorheological fluid E is in a non-flowing state gradually increases with gradually increasing, and the flowable cross-sectional area in the communication passage 16 gradually decreases. That is, based on the relationship between the electric field strength and the shear stress of the electrorheological fluid E shown in FIG. 4, the increment of the applied voltage is proportional to the decrement of the flowable cross-sectional area which is reduced by the increase of the electric field strength based on this increment. As described above, the degree of change in the vertical distance (the concave groove portion 1
The bent shape of the bottom surface of 5b) is defined. That is, the increment of the applied voltage value and the reduction amount of the resonance frequency based on the flowable range of the communication passage 16 have a proportional relationship.

In the case of the second embodiment having the above construction, the communication passage 16
Since the distance between the facing surfaces of the pair of electrode plates 10 and 15 in step 2 changes steplessly, the flowable cross-sectional area of the electrorheological fluid changes correspondingly by gradually changing the applied voltage, As a result, the resonance frequency at which attenuation occurs also gradually changes. For this reason, compared with the first embodiment in which the phase-to-face spacing is changed stepwise, the resonance frequency of the communication passage 16 can be finely changed with respect to the change in the frequency range of the input vibration, and various frequencies can be changed. Anti-vibration performance against input vibration can be reliably obtained. Further, by continuously changing the applied voltage with respect to the input vibration that shifts to the high frequency side, the low value range of the dynamic spring constant can be expanded as shown in FIG.

In addition, the change state of the facing surface spacing is proportional to the increment of the voltage applied to the pair of electrode plates 10 and 15 and the decrement of the flowable cross-sectional area of the electrorheological fluid E in the communication passage 16. Since it is set so that the applied voltage is controlled according to the frequency of the input vibration, a troublesome calculation is not required, and the control can be facilitated.

FIG. 10 shows a partition body 17 of another aspect in the second embodiment, in which 18 is a lower electrode plate,
Reference numeral 19 is a communication passage formed between the facing surfaces of the electrode plate 18 and the upper electrode plate 10.

On the inner surface of the lower electrode plate 18, a V-shaped concave groove portion 18a having a central portion deeper than both side portions is formed, and the concave groove portion 18a forms a relative portion between the pair of electrode plates 10, 18. The vertical distance between facing surfaces is insulation member 1
The minimum value H4 corresponding to the thickness of 2 is changed to a maximum value H6 in a predetermined curve in a stepless manner.

The cross-sectional shape of the communicating passage 19 constituted by the concave groove portion 18a and the inner surface of the flat plate-shaped upper electrode plate 10 facing the concave groove portion 18a has a sectional shape of the voltage applied to the pair of electrode plates 10 and 18. The region in which the electrorheological fluid E is in a non-flowing state gradually increases as the flow rate increases gradually, and the flowable cross-sectional area in the communication passage 19 gradually decreases. That is, based on the relationship between the electric field strength and the shear stress of the electrorheological fluid E shown in FIG. 4, the amount of applied voltage increases, and the electric field strength increases due to this increase. The degree of change in the vertical distance (the bent shape of the bottom surface of the recessed groove portion 18a) is determined so that it is proportional to a large amount. That is, similarly to the communication passage 16 by the partition body 14 of FIG. 8, the increment of the applied voltage value and the reduction amount of the resonance frequency based on the flowable range of the communication passage 19 have a proportional relationship. The cross-sectional shape of the communication passage 19 shows another cross-sectional shape that realizes such a relationship.

In the case of the communication passage 19 having such a sectional shape,
The bent shape of the concave groove portion 18a of the lower electrode plate 18 can be easily specified, and the processing can be facilitated.

FIGS. 11 and 12 show a partition body 20 used in the liquid-filled mount according to the third embodiment of the present invention, and 21 is formed in this partition body 20 and has a pressure receiving chamber 5a and a balance chamber 5b ( (See FIG. 1) is a C-shaped communication passage communicating with each other. The third embodiment is different only in the construction of the partition body 6 of the first embodiment, and the other construction is the same as that of the first embodiment. Therefore, the partition body 2 of the third embodiment will be described below.
Only the configuration of 0 will be described, and other components will be denoted by the same reference numerals and the description thereof will be omitted.

Similar to the partition body 6 of the first embodiment, the partition body 20 includes a pair of upper and lower electrode plates 22 and 23 which are superposed at a predetermined distance from each other, and the pair of electrode plates 22 and 23. Both are inserted between the facing surfaces
A donut plate-shaped insulating member 24 made of silicon rubber or the like for insulating between Nos. 2 and 23 and between the fixing bolts 9, 9 ,. The communication passage 21 is provided. The pair of electrode plates 22 and 23 are connected to a power source by projecting pieces 22a and 23a projecting from different sides so that a predetermined voltage is applied.

The insulating member 24 includes a relatively thin outer peripheral ring portion 24a and a relatively thick central circular portion 24b projecting toward the center from a part of the outer peripheral ring portion 24a and positioned at the center position. The central passage portion 24b and the outer peripheral ring portion 24a define the communication passage 21 in a C shape.

In the communication passage 21, one end of the C-shape is opened to the pressure receiving chamber 5a through the opening 22b of the upper electrode plate 22, and the other end is opened to the equilibrium chamber 5b through the opening 23b of the lower electrode plate 23. Is formed in. A recess 23c corresponding to the thickness of the central circle 24b of the insulating member 24 is formed in the center of the inner surface of the lower electrode plate 23. It is bent in a predetermined shape in the radial direction between the concave portion 23c and the outer circumference, and as a result, an arc-shaped communication path 21 connecting the openings 22b, 23b is formed between the pair of electrode plates 22, 23. A cross-sectional shape is formed in which the vertical distance between the facing surfaces changes steplessly in a predetermined curve from a minimum value H7 on the outer peripheral side corresponding to the thickness of the insulating member 24 to a maximum value H8 on the inner peripheral side. .

In the case of the third embodiment, as in the case of 16 and 19 in the second embodiment, by gradually changing the applied voltage, the flowable cross-sectional area of the electrorheological fluid changes correspondingly, As a result, the resonance frequency at which attenuation occurs also gradually changes. Therefore, the resonance frequency of the communication passage 16 can be finely changed with respect to the change of the frequency range of the input vibration, and the vibration isolation performance against the input vibration of various frequencies can be reliably obtained. Moreover,
Since the communication passage 21 is formed so as to extend in an arc shape, the communication passages 13, 16, 19 in the first or second embodiment are formed.
It is possible to form a communication passage 21 having a longer passage length than
The degree of freedom in tuning the communication passage 21 can be increased.

The present invention is not limited to the above-mentioned first to third embodiments, but includes various modifications. That is, in the above-described first to third embodiments, the liquid-filled mount in which only one partition is provided as the communication passage that connects the pressure receiving chamber 5a and the equilibrium chamber 5b is shown, but the invention is not limited to this. The bodies 12 and 24a may be cut out in a C shape or an annular shape to form a second communication passage that surrounds the periphery of the communication passages 13, 16, 19, and 21.

Further, although the linear communication passages 13, 16 and 19 are shown in the first and second embodiments and the C-shaped communication passage 21 is shown in the third embodiment, the arrangement of these communication passages is insulated. It can be freely changed by changing the shapes of the members 12 and 24.

Further, in the first and second embodiments described above, the communication passage having a predetermined cross-sectional shape is formed by forming the concave groove portion in the lower electrode plates 11, 15 and 18, but this is not the case. For example, the recessed groove may be formed in the upper electrode plate or the upper and lower electrode plates, and the recessed groove may be formed by press working.

[0049]

As described above, according to the liquid-filled engine mount in the first aspect of the invention, the partition body is formed by the pair of electrode plates which are superposed on each other, and the pair of electrode plates face each other. An insulating member is formed between the surfaces to form a communication passage that communicates the pressure receiving chamber and the equilibrium chamber, and a face-to-face distance between the pair of electrode plates in the cross-sectional shape of the communication passage is formed by applying a voltage. The electric field strength changes the distance from the solidification of the electrorheological fluid through the communication passage to the distance at which the viscosity of the electrorheological fluid does not substantially change. The flowable cross-sectional area of the viscous fluid can be changed. As a result, the resonance frequency that causes attenuation is changed, so that the frequency range in which the vibration isolation performance is exhibited can be widely changed.

Further, the above-described communication passage can be formed by simply stacking a pair of electrode plates with an insulating member interposed therebetween, which facilitates the assembling work as compared with the conventional liquid-filled mount, and the parts. The number of points can be reduced.

According to the second aspect of the invention, in addition to the effect of the first aspect of the invention, the distance between the opposed faces of the pair of electrode plates in the communication passage is changed stepwise in a plurality of steps. By controlling the applied voltage stepwise, the flowable cross-sectional area of the electrorheological fluid can be changed stepwise in the above-mentioned multiple steps, which simplifies the voltage control and also allows multiple frequencies. Anti-vibration performance can be reliably obtained in each of the areas.

According to the invention of claim 3, in addition to the effect of the invention of claim 1, the distance between the opposed faces of the pair of electrode plates in the communicating passage is continuously changed. By gradually changing the applied voltage, the flowable cross-sectional area of the electrorheological fluid can be gradually changed, and thereby the resonance frequency at which attenuation occurs can be gradually changed. Therefore, compared with the invention according to claim 2 in which the phase-to-face spacing is changed stepwise, the resonance frequency of the communication passage can be finely changed with respect to the change of the frequency range of the input vibration, and various frequencies can be obtained. It is possible to reliably obtain the vibration isolation performance against the input vibration of.

Further, according to the invention described in claim 4, in addition to the effect of the invention described in claim 1, the change state of the phase-to-face spacing is determined by the voltage applied to the pair of electrode plates and the communication path. Since the flowable cross-sectional area of the electrorheological fluid is set to have a proportional relationship, a complicated calculation is required when changing the flowable cross-sectional area according to the frequency of the input vibration to change the desired resonance frequency. It can be omitted, and the control of the applied voltage value can be facilitated.

[Brief description of drawings]

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

FIG. 2 is a plan view of the partition body of FIG.

FIG. 3 is an enlarged cross-sectional view taken along the line AA of FIG.

FIG. 4 is a relationship diagram between electric field strength and shear stress of an electrorheological fluid.

FIG. 5 is a relationship diagram between frequency and attenuation characteristics.

FIG. 6 is a relationship diagram between frequency, damping characteristics, and dynamic spring constant.

FIG. 7 is a partial cross-sectional view showing a second embodiment, corresponding to FIG.

8 is an enlarged cross-sectional view taken along line BB of FIG.
It is a figure corresponding to FIG.

FIG. 9 is a relationship diagram between frequency and dynamic spring constant.

FIG. 10 is a view corresponding to FIG. 8 showing another aspect of the second embodiment.

FIG. 11 is a view corresponding to FIG. 2 showing a third embodiment.

12 is a cross-sectional view taken along the line CC of FIG.

[Explanation of symbols]

 1 1st support body 2 2nd support body 3 Elastic support body 4 Diaphragm (elastic diaphragm member) 5 Liquid chamber 5a Pressure receiving chamber 5b Balance chamber 6,14,17,20 Partition body 10,11 A pair of electrode plates 10,15 A pair Electrode plate 10,18 Pair of electrode plates 12,24 Insulation member 13,16,19,21 Communication passage 22,23 Pair of electrode plate E Electrorheological fluid H1 to H8 Phase facing surface spacing

Claims (4)

[Claims] 1. A first and a second support body, which are arranged at a predetermined distance in a vibration input direction, an elastic support body connecting the first and second support bodies to each other, and the elastic support body. A liquid chamber in which one side is defined in the vibration input direction and the other side is defined by an elastic diaphragm member, and an electrorheological fluid is enclosed therein; a pressure chamber on the elastic bearing side and the elastic diaphragm. In a liquid-sealed mount comprising a partition body for partitioning into the equilibrium chamber on the side of the member, and a communication passage formed in the partition body for communicating the pressure receiving chamber and the equilibrium chamber with each other, the partition bodies are mutually predetermined. It is composed of a pair of electrode plates that are overlapped with each other at a distance to form the communication path between the facing surfaces, and an insulating member that blocks the facing surfaces of the pair of electrode plates to define the communication path. , The above-mentioned communication passage is A distance in which the electrorheological fluid is solidified by an electric field strength formed by applying a voltage in a direction orthogonal to the flow direction of the electrorheological fluid passing through the communication passage, in which the distance between the pair of electrode plates facing each other is orthogonal to the flowing direction. To the distance where the viscosity of the electrorheological fluid does not substantially change, the liquid-filled mount. 2. The inter-face spacing of the pair of electrode plates in the communication passage according to claim 1,
Liquid-filled mount set to change in multiple steps. 3. The inter-face spacing of the pair of electrode plates in the communication passage according to claim 1,
Liquid-filled mount set to change infinitely. 4. The change state of the facing surface spacing according to claim 1, wherein the increment of the voltage applied to the pair of electrode plates is proportional to the decrease of the flowable cross-sectional area of the electrorheological fluid in the communication passage. Liquid-filled mount that is set to