JP3499279B2 - Control type anti-vibration device - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a vibration isolator in which a vibration plate is arranged in a liquid chamber, and the vibration plate is forcibly excited by an actuator to suppress and control an increase in internal pressure of the liquid chamber. More specifically, the present invention relates to a control type vibration damping device in which an operating characteristic converting means for converting an operating characteristic such as an oscillating operating force or an oscillating operating stroke by the actuator is interposed between the diaphragm and the actuator.

[0002]

2. Description of the Related Art Conventionally, as this type of vibration isolator, there has been known one in which a piezoelectric element is used as an actuator for vibrating a diaphragm, and an expansion mechanism for expanding the expansion / contraction amount of the piezoelectric element is provided ( For example, the actual Kaihei 5-50200
(See Japanese Patent Publication). In this structure, the amount of expansion and contraction due to the voltage application and interruption of the piezoelectric element, that is, the vibration stroke of the diaphragm is extremely small. The piston fixed to the element is fitted inside, and the tip of the elastic cap fitted inside the small-diameter cylindrical portion is brought into contact with the vibration plate, thereby expanding the expansion and contraction amount of the piezoelectric element and vibrating the vibration plate. I have to.

[0003]

In the conventional vibration isolator described above, in order to effectively expand the expansion / contraction amount of the piezoelectric element, it is necessary to keep the volume of the hydraulic oil in the cylinder unchanged. Therefore, in the work of injecting the working oil into the cylinder and fitting the piston and the elastic cap therein, it is necessary to perform the work carefully so that no bubbles remain in the working oil.

However, in the above work, the vibration isolator itself is relatively small, and the cylinder to be mounted therein is even smaller, and this assembling work is difficult. May remain. When bubbles remain in the hydraulic oil, even if the piston pressurizes the hydraulic oil due to the expansion of the piezoelectric element, the residual bubbles are compressed and the volume of the entire hydraulic oil changes, and the expansion amount of the piezoelectric element is reduced. It is not amplified effectively, and it becomes impossible to obtain the expansion and contraction amount amplification corresponding to the area ratio between the pressing surface of the piston of the large-diameter tubular portion and the pressure-receiving surface of the elastic cap of the small-diameter tubular portion.
In particular, when a piezoelectric element is used as an actuator, its expansion and contraction amount is extremely small, so that even if the remaining bubbles are very small (for example, in the size of a micrometer), the volume change due to the compression of the bubbles does not occur. The degree of influence of the vibration plate on the vibration stroke becomes extremely large, and therefore, the vibration stroke becomes close to the amount of expansion and contraction of the piezoelectric element itself, which greatly deteriorates the vibration characteristic and causes a predetermined vibration. There is a problem that the vibration plate cannot be excited due to the vibration characteristic.

The present invention has been made in view of such circumstances, and it is an object of the present invention that even if bubbles are left in the vibration actuation mechanism of the diaphragm by the actuator at the time of its manufacture, This is to obtain the effect of vibrating the diaphragm while surely preventing the deterioration of the vibrating characteristics.

[0006]

In order to achieve the above object, the invention according to claim 1 connects a pair of mounting members which are arranged apart from each other in the vibration input direction and the pair of mounting members. An elastic support, a liquid chamber defined by the elastic support and containing an incompressible liquid, and the side of the elastic support located above the liquid chamber as a pressure receiving chamber. It is arranged so as to partition, a diaphragm which is displaceably supported in the direction of scaling the volume of the receiving pressure chamber, the upper by the diaphragm
Separated from the pressure receiving chamber, at least part of which is an elastic thin film
An equilibrium chamber that is defined by members and can expand and contract, and this equilibrium chamber
An orifice communicating with the pressure receiving chamber and an actuator for vibrating the diaphragm are provided. By controlling the operation of this actuator, the internal pressure of the liquid chamber on the elastic bearing side is controlled. Assuming things.
In this structure, an operating characteristic converting means for converting a characteristic of an oscillating operation of the diaphragm by the actuator is interposed between the diaphragm and the actuator, and the operating characteristic converting means has the same liquid inside as the liquid. A cylinder having a cylinder chamber in which is enclosed, a pair of driving-side and driven-side piston members that are arranged to be able to move forward and backward in the cylinder, and bubbles in the cylinder chamber are discharged to the pressure receiving chamber side above the liquid chamber. It is configured with a bubble vent hole. The base end portion of the driving side piston member is connected to the actuator so that the actuator is vibrated and the pressing surface of the tip end portion is arranged in the cylinder so as to face the fluid in the cylinder chamber, while the driven side is arranged. The base end portion of the piston member is attached to the vibration plate, and the pressure receiving surface of the tip end portion is arranged so as to receive the vibration actuating force from the drive side piston member via the fluid in the cylinder chamber. Further, the bubble vent hole is formed so as to penetrate the piston member located above the drive side piston member and the driven side piston member to communicate the cylinder chamber and the pressure receiving chamber with each other, and the bubble vent hole is formed. The resonance frequency of the liquid column through is set so as to be sufficiently lower than the frequency range of the input vibration that is preset for operating the actuator.

[0007] According to a second aspect of the present invention, in the first aspect, which the structure to be formed on the elastic support body so as to open downward facing the pot portion for accommodating the gas bubbles to the top of the pressure receiving chamber Is.

[0008] According to a third aspect, the invention described in claim 2, one with respect to crucible section, a configuration of setting a sufficiently low resonance frequency than the set resonance frequency of the liquid column through the orifice It is a thing.

According to a fourth aspect of the present invention, in the first aspect of the invention, the area of the pressing surface of the driving side piston member is set smaller than the area of the pressure receiving surface of the driven side piston member, and the operating characteristic converting means is The configuration is such that the vibration actuation force characteristic of the driven side piston member is amplified.

According to a fifth aspect of the present invention, in the first aspect of the invention, the area of the pressing surface of the driving side piston member is set to be larger than the area of the pressure receiving surface of the driven side piston member, and the operating characteristic converting means is set. Is configured to amplify the vibration operation stroke characteristic of the driven side piston member.

Further, the invention according to claim 6 is the same as claim 1.
In the invention described above, the actuator is configured by using a piezoelectric element that expands and contracts by applying and blocking a voltage.

[0012]

With the above construction, in the invention according to claim 1,
When vibration is input to the elastic support through the mounting member, the hydraulic pressure in the liquid chamber tends to fluctuate due to the deformation of the elastic support, but the operating force is changed by the operation of the actuator through the operation characteristic conversion means. since the diaphragm is transmitted is forced vibration Te, the pressure receiving chamber of the volume forcibly been scaled absorption of fluid pressure variations in the chamber <br/> of its is achieved. At this time, in the operation characteristic conversion means, the area of the pressure-applying surface of the drive-side piston member and the area of the pressure-receiving surface of the driven-side piston member are set to different sizes from each other. The advancing / retreating operation characteristic is converted according to the ratio of the both areas, and the driven-side piston member is advanced / retreating with an operating force characteristic or an operating stroke characteristic different from that of the driving-side piston member.

On the other hand, when the air mixed in the cylinder chamber at the time of manufacture remains as bubbles in the liquid therein, the bubbles are formed because the bubble vent hole is formed in the piston member on the upper side of the cylinder chamber. of upward through the bubble vent hole
It is discharged to the pressure receiving chamber side. As a result, the liquid in the cylinder chamber due to the forward / backward movement of the drive side piston member is kept constant as the volume of the cylinder chamber, and the predetermined operating characteristics are reliably maintained. Moreover, since the resonance frequency of the liquid column resonance through the bubble vent is set to be sufficiently lower than the set frequency range of the input vibration for operating the actuator, the bubble vent is used in the frequency range for operating the actuator. Is locked and locks. For this reason, the conversion of the operating characteristics based on the area ratio of the pressure-applying surface and the pressure-receiving surface of each piston member is surely made to be predetermined.

[0014] In the second aspect of the present invention, in addition to the effect of the invention according to the first aspect, the bubbles discharged through the bubble vent hole which is formed on top of the piston member in the cylinder chamber rises in the pressure receiving chamber, It is housed in a crucible that opens at the top. Consequently, elimination of the presence of the bubble is possible from the liquid of the receiving pressure chamber.

According to the third aspect of the invention, in addition to the effect of the second aspect of the invention, the resonance frequency is sufficiently lower than the set resonance frequency of the orifice for communicating the pressure receiving chamber and the equilibrium chamber with respect to the pot. Since the resonance frequency is set,
In the frequency range where the vibration of the input vibration is attenuated by the resonance of the liquid column of the orifice, the crucible portion containing the bubbles locks.
As a result, when the vibration in the frequency range is input, the bubbles in the pot are prevented from being mixed with the liquid in the liquid chamber, and the deterioration of the damping characteristic of the orifice due to the mixture is surely prevented.

According to the invention described in claim 4, in addition to the operation according to the invention described in claim 1, the area of the pressing surface of the driving side piston member is set smaller than the area of the pressure receiving surface of the driven side piston member to operate. The characteristic converting means converts the operating characteristic such that the driven side piston member is moved forward and backward with an operating force larger than the operating force of the actuator. Even in such a case, even if air bubbles remain during manufacturing, the air bubbles are discharged through the air bubble vent holes and the volume change in the cylinder chamber due to the above-mentioned remaining air bubbles is prevented, resulting in a decrease in the conversion efficiency of the operating characteristics. To be prevented.

According to the invention of claim 5, in addition to the operation of the invention of claim 1, the area of the pressing surface of the driving side piston member is set larger than the area of the pressure receiving surface of the driven side piston member. The operating characteristic converting means converts the operating characteristic such that the driven side piston member is moved forward and backward with an operating stroke larger than the operating stroke of the actuator. Even in such a case, even if air bubbles remain during manufacturing, the air bubbles are discharged through the air bubble vent holes and the volume change in the cylinder chamber due to the above-mentioned remaining air bubbles is prevented, resulting in a decrease in the conversion efficiency of the operating characteristics. To be prevented.

Further, in the sixth aspect of the invention, in addition to the operation of the first aspect of the invention, the actuator is composed of a piezoelectric element, and the piezoelectric element is expanded / contracted by applying / cutting off a voltage, so that the driving side piston. The member is vibrated. At this time, since the amount of expansion and contraction due to the piezoelectric element is extremely small, when bubbles remain in the cylinder chamber, even if the amount of remaining bubbles is extremely small, it has a great effect on the increase conversion action of the operation stroke by the operation characteristic conversion means. To do.
However, since the residual bubbles are reliably discharged by the bubble vent holes, even when the piezoelectric element is used as the actuator, it is possible to vibrate the diaphragm with a surely amplified operation stroke.

[0019]

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

[0020] Figure 1 shows a control vibration damping device according to the real施例of the present invention. In the figure, 1 is a first support cylinder with the cylinder axis X directed in the vertical direction, and 2 is a bottomed second support cylinder that closes the lower end opening side of the first support cylinder 1, both of which are The lower first mounting member 3 is configured by being integrally connected.
An enlarged diameter portion 2a is formed on the upper end portion of the second support cylinder body 2 and is enlarged in the outer peripheral direction over a predetermined dimension in the cylinder axis X direction, while the lower end portion of the first mounting member 1 is expanded. Part 2
After the diameter is enlarged so as to cover the outer periphery of a, the caulking portion 1a is formed so as to sandwich it from above and below, and the both 1 and 2 are integrated with each other. The second support cylinder 2 is fitted in a vibration receiving portion, for example, a bracket of a vehicle body, and fixed in position by the expanded diameter portion 2a and the caulking portion 1a.

Reference numeral 4 denotes an upper second mounting member which is located on the upper end opening side of the first supporting cylindrical body 1 and is arranged on the cylindrical axis X. The second mounting member 4 includes the cylindrical shaft. The mounting bolt 4a is projected upward along X and is connected to a vibration generating source such as an engine. Reference numeral 5 denotes an annular elastic bearing body that connects the second mounting member 4 and the first support carrier 1 of the first mounting member 3 to each other. The elastic bearing body 5 is the second mounting member 4 and the first mounting member 3. Support cylinder 1
The first mounting member 3 and the second mounting member 4 are integrally vulcanized and molded.
And are connected to each other. Then, the first mounting member 3
A rubber thin film diaphragm 6 as an elastic thin film member attached to the first supporting cylinder 1, the elastic support 5
Defines a liquid chamber 7, and an incompressible liquid 8 is enclosed in the liquid chamber 7.

Further, 9 is a partition body as a vibrating plate which is arranged in a direction orthogonal to the cylinder axis X at an intermediate position in the liquid chamber 7 in the vertical direction.
Is partitioned into a pressure receiving chamber 7a which is expanded and contracted by the deformation of the upper elastic support body 5 and an equilibrium chamber 7b which is expanded and contracted by the lower diaphragm 6. In addition, an annular orifice 10 that connects the pressure receiving chamber 7a and the equilibrium chamber 7b to each other is formed around the partition body 9. The partition body 9 is attached to the inner peripheral surface of the first mounting member 3 through an elastic support member 11 having an annular circumference, whereby the partition body 9 is relatively displaceable in the vertical direction. It is elastically supported by.

Further, 12 is an actuator for forcibly vibrating the partition body 9 in the vertical direction. This actuator 12 includes a permanent magnet 13 fixed to the bottom wall of the second support cylinder 2, and a drive side which will be described later. An electromagnetic coil 14 provided on the outer periphery of the piston member 17 and a controller (not shown) for controlling energization of the alternating current to the electromagnetic coil 14 are provided. The actuator 12 is configured to vibrate the partition body 9 in the vertical direction via the operating characteristic conversion means 15.

The operating characteristic converting means 15 is the cylinder 1
6, a drive-side piston member 17 having a tip portion (upper end portion) inserted in the cylinder 16 upward and downward so as to be able to move forward and backward, and a tip portion (lower end portion) described above.
A driven-side piston member 18 having a base end portion (upper end portion) integrally connected to the partition body 9 such that the driven piston member 18 is inserted downward from above so as to be able to move forward and backward, and a bubble vent hole 24 described later. ing. The driving-side piston member 17 is formed in a circular cross section with a small diameter so that the pressing surface 17a at the upper end has a relatively small area (A1), while the driven-side piston member 1
8 is formed in a circular cross section having a diameter larger than that of the drive side piston member 17 by a predetermined amount, and the pressure receiving surface 18a at the lower end has an area (A2) larger than the area (A1) by a predetermined amount.
The electromagnetic coil 14 is provided in the tubular portion 17b on the base end (lower end) side of the drive-side piston member 17, and the drive-side piston member 17 moves back and forth to move forward and backward. Is transmitted to the driven side piston member 18 via the incompressible working liquid 8 sealed in the cylinder chamber 16a of the cylinder 16. That is, when the vertical actuation force of the driving side piston member 17 by the actuator 12 is F1 and the actuation force received by the driven side piston member 18 via the actuation liquid 8 is F2, this F2 is the area A1, A
Based on 2, F2 = (A2 / A1) .F1 and the operating force characteristics are amplified and converted to (A2 / A1) times that of F1.

The overall structure will be described in more detail below. A rubber thin layer 5a is integrally formed with the elastic bearing member 5 on the inner peripheral surface of the lower end side of the first supporting cylinder 1 which extends to the caulking portion 1a. It is vulcanized and bonded. Then, between the rubber thin layer 5a of the caulked portion 1a and the inner surface of the expanded diameter portion 2a of the second support cylinder 2, the outer peripheral side attachment ring 1 of the elastic support member 11 described later is formed.
The flange portion 1b, the outer peripheral portion of the cylinder 16 and the outer peripheral portion of the diaphragm 6 are sandwiched in a state of being overlapped with each other, whereby the partition 9, the cylinder 16 and the diaphragm 6 are first mounted. Attachment to the member 3 is performed.

The partition body 9 has a first bottomed tubular member 9a that opens downward, and a second bottomed tubular member 9b that opens upward and the peripheral edge of the upper end projects outward, and then folds back downward.
The second bottomed tubular member 9b is integrated with the inner surface of the first bottomed tubular member 9a from the lower side in an internally fitted state. The orifice 10 is constituted by an annular passage formed between the outer periphery of the upper end of the second bottomed tubular member 9b and the inner periphery of the upper end of the first bottomed tubular member 9a. Is the opening 1 on one side in the circumferential direction
0a communicates with the pressure receiving chamber 7a, while opening 10 on the other side
b communicates with the equilibrium chamber 7b. Further, the central portion of the second bottomed tubular member 9b is fitted into the cylinder 16 so as to project downward on the tubular axis X, and the second bottomed tubular member 9b.
The driven side piston member 18 is constituted by the central portion of b.

On the other hand, the elastic support member 11 has a pair of mounting rings 11a, 11b arranged on each side of the inner and outer circumferences, and both mounting rings 11a, 11b are integrally vulcanized and bonded together. It is composed of an annular rubber elastic body 11c that connects 11b to each other. The first bottomed tubular member 9 is formed on the inner peripheral surface of the inner peripheral side mounting ring 11a.
While the outer peripheral surface of a is press-fitted, the outer peripheral side mounting ring 1
By attaching the flange portion 1b to the first mounting member 3 as described above, the partition body 9 is elastically supported so as to be vertically displaceable with respect to the first mounting member 3.

The cylinder 16 is formed by a pair of plate-like members 19 and 20 which are vertically overlapped with each other and integrated with each other, and these plate-like members 19 and 2 are integrated with each other.
The outer peripheral portion of 0 is fixed to the first mounting member 3 as described above. Of the above, a small-diameter cylinder portion 19a extending downward along the cylinder axis X is integrally formed in the central portion of the lower plate-like body 19, and the small-diameter cylinder portion 19a penetrates the diaphragm 6 and the liquid chamber 8 It projects into the space 21 defined by the inner peripheral surface of the outer second support cylinder 2. And this small diameter cylinder part 1
The outer peripheral surface of the upper end portion of the drive-side piston member 17 is liquid-tightly fitted into the inner peripheral surface of 9a through the rubber elastic member 22 so that the drive-side piston member 17 is supported so as to be able to move forward and backward in the vertical direction. There is.

On the other hand, a large-diameter cylindrical portion 20a extending upward along the cylindrical axis X is integrally formed in the central portion of the upper plate-like body 20, and the driven surface is attached to the inner peripheral surface of the large-diameter cylindrical portion 20a. The outer peripheral surface of the lower end portion of the side piston member 18 is liquid-tightly fitted in via a bottomed tubular rubber elastic member 23 so that the driven side piston member 18 is supported so as to be able to move forward and backward in the vertical direction.
Then, the pressure receiving surface 18a of the driven side piston member 18
And the large-diameter cylindrical portion 20a and the drive-side piston member 1
The cylinder chamber 16a is defined by being closed by the pressure surface 17a of the cylinder 7.

In addition, the pressure receiving surface 18a of the driven side piston member 18 is provided with a bubble vent hole 24 having a predetermined small diameter, and the bubbles remaining in the cylinder chamber 16a through the bubble vent hole 24 are stored in the pressure receiving chamber 7a. It is designed to be discharged to the side. Further, the dimensional specifications such as the diameter of the bubble vent hole 24 are determined by the rubber elastic body 11c and the rubber elastic members 22, 2
The resonance frequency defined by the expansion spring based on 3 and the mass of the liquid in the bubble vent hole 24 is set to be sufficiently lower than the frequency range in which the partition body 9 is forcibly excited by the operation of the actuator 12. That is, when the vibration in the frequency region for controlling the internal pressure of the pressure receiving chamber 7a is input by the forced vibration of the partition body 9, the bubble vent hole 24 is locked due to a clogging phenomenon. Further, a crucible portion 25 is formed at the top of the elastic bearing member 5 so as to face the uppermost portion of the pressure receiving chamber 7a and opens downward. The crucible portion 25 rises and accumulates at the top of the pressure receiving chamber 7a. It is designed to contain air bubbles. The dimensional specifications such as the inner diameter and the length of the pot 25 are set so that the resonance frequency is sufficiently lower than the set resonance frequency of the orifice 10, and the liquid column resonance of the orifice 10 causes vibration. At the time of inputting vibration in the low frequency range for damping, the pot portion 25 causes a clogging phenomenon and locks.

In the actuator 12,
The electromagnetic coil 14 is connected to a line (not shown) arranged so as to pass through the second support cylindrical body 2 and is energized through this line. On the other hand, yoke fittings 26 and 27 are connected to the upper and lower poles of the permanent magnet 13, respectively, and these yoke fittings 26 and 27 interpose the electromagnetic coil 14 in a direction perpendicular to the cylinder axis X via a predetermined gap. It is arranged so as to sandwich it.

In the figure, 28 is the pair of plate-like members 19,
One or more rather large communicating holes vertically penetrating the outer peripheral portion of 20. By means of this communicating hole 28, the portion above the plate-like members 19 and 20 in the equilibrium chamber 7b and the lower side which is the diaphragm 6 side. A free flow of the liquid 8 is made between the portions.

Next, action of the actual施例the above configuration, the effect will be described.

When vibration in the low frequency range is input from the second mounting member 4 side in the vertical direction to the elastic support body 5, this elastic support body 5
Is bent in the vertical direction, and the liquid 8 in the pressure receiving chamber 7a flows through the orifice 10 to the equilibrium chamber 7b. And
Due to the flow of the liquid 8, the pressure receiving chamber 7a and the equilibrium chamber 7b are
A liquid column resonance is generated between the nozzles 1 and 2 via the orifice 10, and the liquid column resonance attenuates the vibration.

Even when the input vibration is on the higher frequency side and a so-called locked state in which the flow of the liquid 8 through the orifice 10 does not substantially occur, the electromagnetic wave is generated depending on the input direction of the vibration. By energizing the coil 14 and operating the actuator 12, the partition body 9 can be forcibly excited in the vertical direction, and fluctuations in the hydraulic pressure in the pressure receiving chamber 7a can be absorbed. That is, by vibrating the partition body 9 in the same phase side as the displacement direction of the second mounting member 4 that receives the vibration input, it is possible to suppress a sudden increase in the hydraulic pressure in the pressure receiving chamber 7a. (1) It is possible to reduce the transmissibility to the mounting member 3 side and the dynamic spring constant.

During this forced vibration, the drive side piston member 17 is moved up and down by the operation of the actuator 12, and the pressurizing surface 17a pressurizes and depressurizes the liquid 8 in the cylinder chamber 16a. The changed internal pressure of the cylinder chamber 16a acts on the pressure receiving surface 18a of the driven side piston member 18 to move the driven side piston member 18 up and down. At this time, the operating force of the drive-side piston member 17 is amplified by the ratio (A2 / A1) of the area (A2) of the pressure receiving surface 18a to the area (A1) of the pressing surface 17a. The driven piston member 18 is vertically vibrated. Therefore, the operating force of the actuator 12 (A2 / A1)
The partition body 9 can be vibrated with a double operating force. In this way, by interposing the operating characteristic conversion means 15 between the actuator 12 and the partition body 9, the actuator 1
Even if 2 is a combination of the permanent magnet 13 and the electromagnetic coil 14 and can obtain only a comparatively weak excitation force, the partition 9 can be operated with a required strong excitation force. , The capacity and scale of the actuator 12 for operating the partition body 9 with the same excitation force, that is, the scale of the permanent magnet 13 and the current value to the electromagnetic coil 14 can be reduced, and the vibration damping device as a whole can be reduced. It is possible to make the device compact and reduce the operating cost. In this case, although the working stroke of the driven side piston member 18 is smaller than that on the driving side, the permanent magnet 13 and the electromagnetic coil 14 are
Since the actuator 12 formed by the combination of and has a relatively large operating stroke, it is possible to sufficiently secure the required operating stroke.

In the vibration isolator that performs such amplification and conversion of the operating force characteristic, since the cylinder chamber 16a is communicated with the pressure receiving chamber 7a through the bubble vent hole 24, for example, when the vibration isolator is manufactured. Air bubbles are in the cylinder chamber 16a
Even if it remains in the liquid 8, the remaining bubbles are discharged to the pressure receiving chamber 7a side through the bubble vent hole 24, rise in the liquid 8 in the pressure receiving chamber 7a, and reach the top. It is stored in the pot portion 25. With this, even if
Even if the bubbles remain during manufacturing, it is possible to reliably discharge and separate the residual bubbles from the cylinder chamber 16a and / or the pressure receiving chamber 7a. As a result, it is possible to prevent the efficiency of characteristic conversion of the operating force from being lowered due to the change in the internal pressure being absorbed by the bubbles remaining in the cylinder chamber 16a. Moreover, since the bubble vent hole 24 is tuned so as to be locked in a high frequency range where the partition body 9 is forcibly excited, the characteristic conversion action of the operating force by the operation characteristic conversion means 15 can be reliably obtained. . In addition, since the pot portion 25 is tuned so as to lock in the low frequency region where the orifice 10 is damped, it is possible to reliably prevent the vibration damping function of the orifice 10 in the low frequency region from being impaired . <Other embodiments Example> The present invention is not limited to the above you施例,
It also includes various other modifications. That is,
In the above embodiment , each piston member 17, 18, 35, 3
6 is elastically supported by the rubber elastic members 22, 23, 39, 40, but is not limited to this, and may be supported so as to be able to advance and retreat by sliding in a liquid-tight state.

In the above embodiment, both the driving side and the driven side piston members 17, 35, 18 and 36 are arranged so that the advancing and retreating directions are the up and down directions. Only the piston members 18 and 36 need to be arranged in the vertical direction, which is the vibration direction of the diaphragm, and the drive side piston members 17 and 35 are arranged in the cylinder chambers 16a and 34a.
As long as the liquid inside can be pressurized or depressurized, it may be arranged so as to move forward or backward in any direction.

In the above embodiment, the orifice 10 is formed in the partition bodies 9 and 31 itself, but the invention is not limited to this.
For example, the orifice may be formed completely independently of the partition body.

Further, in the above embodiment, the actuator
12 includes a permanent magnet 13 and an electromagnetic coil 14.
However, the piezoelectric element is not limited to this.
The actuator used can also be adopted. This place
In this case, the operating characteristic changing means may be, for example, circles.
It has a driving side driven member and a driven side piston member made of a board member.
Using the cylinder, the surface of the pressure receiving surface of the driven side piston member
The product is a predetermined amount than the area of the pressing surface of the driving side piston member,
It is preferable to make it small. By doing this, the above actuator
The straw for vertically driving the driving-side piston member
Is increased by the operating characteristic changing means, and
The piston member can be activated.

[0041]

As described above, according to the control type vibration damping device of the first aspect of the invention, the cylinder and the actuator are provided between the diaphragm and the actuator for forcibly exciting the diaphragm. Operation consisting of a drive-side piston member that is connected and moves back and forth with respect to the cylinder, a driven-side piston member that is connected to the vibration plate and driven by the incompressible liquid enclosed in the cylinder chamber, and a bubble vent hole Since the characteristic converting means is interposed and the area of the pressing surface of the driving side piston member and the area of the pressure receiving surface of the driven side piston member are set to different sizes from each other, the operating force of the driven side piston member or The advancing / retreating characteristic such as the operating stroke can be calculated by comparing the area of the pressure surface and the area of the pressure receiving surface with respect to the advancing / retreating operation force of the driving side piston member by the actuator or the operating stroke It can be that varied depending on the.

In the vibration isolator capable of converting such operating characteristics, even when the air mixed in the cylinder chamber at the time of manufacture remains as bubbles in the liquid inside, the upper part of the cylinder chamber forming a bubble vent hole on the side of the piston member, the bubbles above the pressure-receiving chamber side of the liquid chamber can be reliably discharged, as a result, the cylinder of liquid in the cylinder chamber during reciprocating actuation of the drive-side piston member The volume of the chamber can be reliably maintained constant and a conversion of operating characteristics with a predetermined efficiency can be reliably obtained. Moreover, since the resonance frequency of the liquid column resonance through the bubble vent is set to be sufficiently lower than the set frequency range of the input vibration for operating the actuator, the bubble vent is used in the frequency range for operating the actuator. Can be locked as a clogged state, so that the conversion of the operating characteristics based on the area ratio between the pressure surface and the pressure receiving surface of each piston member can be reliably maintained at a predetermined value.

According to the second aspect of the invention, in addition to the effect of the first aspect of the invention, a crucible portion for accommodating air bubbles is provided at the top of the elastic bearing located above the pressure receiving chamber. , air bubbles discharged into the pressure receiving chamber through the bubble vent hole which is formed on top of the piston member of the cylinder chamber can be housed in the pot part, as a result, eliminating the air bubbles from the liquid in receiving pressure chamber You can

[0044] According to the third aspect of the invention, in addition to the effect of the invention of the second aspect, one with respect to pot part, than setting the resonance frequency of the orifice to communicate with each other and a pressure receiving chamber and the equilibrium chamber Since a sufficiently low resonance frequency is set, the pot containing the bubbles can be locked in the frequency range where the input column vibration is damped by the resonance of the liquid column of this orifice. It is possible to reliably prevent the bubbles in the pot portion from being mixed with the liquid in the pressure receiving chamber and deteriorating the damping characteristic of the orifice when is input.

According to the invention of claim 4, in addition to the effect of the invention of claim 1, the area of the pressing surface of the driving side piston member is set smaller than the area of the pressure receiving surface of the driven side piston member. If the operating characteristic is converted by the operating characteristic converting means such that the driven side piston member is moved forward and backward with an operating force larger than the operating force of the actuator, even if bubbles remain during manufacturing, As a result of the bubbles being discharged through the bubble vents and the volume change in the cylinder chamber caused by the residual bubbles being prevented from occurring, it is possible to reliably prevent the conversion efficiency of the operating characteristics from decreasing.

According to the invention of claim 5, in addition to the effect of the invention of claim 1, the area of the pressing surface of the driving side piston member is larger than the area of the pressure receiving surface of the driven side piston member. In the case where the operating characteristic is converted by the operating characteristic converting means so that the driven side piston member is moved forward and backward with an operating stroke larger than the operating stroke of the actuator, even if bubbles remain during manufacturing, The bubbles can be discharged through the bubble vents to prevent the volume change in the cylinder chamber due to the residual bubbles, and as a result, it is possible to reliably prevent the conversion efficiency of the operating characteristics from being lowered.

Further, according to the invention of claim 6, in addition to the effect of the invention of claim 1, the actuator is composed of a piezoelectric element, and the driving side piston is expanded and contracted by applying and blocking a voltage. When the member is vibrated, the amount of expansion and contraction by the piezoelectric element is extremely small, and the increase in the operation stroke by the operation characteristic conversion means with respect to the amount of bubbles remaining in the cylinder chamber is extremely large. Even as a result, it is possible to reliably discharge the residual bubbles by the bubble vents,
It is possible to reliably vibrate the diaphragm with an operation stroke having a predetermined increased conversion efficiency. Therefore, even when the piezoelectric element is used as the actuator and the operation characteristic conversion means for increasing the operation stroke is combined with the actuator, the effect of increasing the operation stroke can be reliably obtained by providing the bubble vent hole.

[Brief description of drawings]

1 is a longitudinal sectional view showing the actual施例of the present invention.

[Explanation of symbols]

3 1st mounting member 4 2nd mounting member 5 Elastic support 6 Diaphragm (elastic thin film member) 7 Liquid chamber 7a Pressure receiving chamber 7b Equilibration chamber 8 Liquid 9 Partition body (vibrating plate) 10 Orifice 1 2 Actuator 1 5 Operating characteristic conversion means 1 7 Drive side piston member 1 8 Driven piston member 17a pressing surface 2 4 bubble vent holes 25 urn portion 18 a pressure receiving surface

─────────────────────────────────────────────────── --- Continuation of the front page (56) References JP-A-2-42228 (JP, A) JP-A 63-67438 (JP, A) JP-A 60-237237 (JP, A) JP-A 47- 9368 (JP, A) JP-A-2-163292 (JP, A) Actually opened 60-71748 (JP, U) Actually opened 60-65444 (JP, U) Actually opened 63-14003 (JP, U) Actual Kaihei 5-50200 (JP, U) (58) Fields surveyed (Int.Cl. ⁷ , DB name) F16F 13/26

Claims (6)

(57) [Claims] 1. A pair of mounting members, which are arranged apart from each other in the vibration input direction, an elastic support member that connects the pair of mounting members to each other, and an incompressible liquid defined by the elastic support members. And the liquid chamber in which the
It is arranged to the side of the elastic support member for location so as to divide the receiving chamber, specification and diaphragm which is displaceably supported in the direction of scaling the volume of the receiving pressure chamber, and the pressure-receiving chamber by the diaphragm
It is cut and at least part of it is
A balanced chamber that can be expanded and contracted, and this balanced chamber and the pressure receiving chamber
A control type vibration damping device that is provided with an orifice communicating with and an actuator that vibrates the vibration plate, and controls the operation of the actuator to control the internal pressure of the liquid chamber on the elastic bearing side. In the device, between the diaphragm and the actuator, an operation characteristic conversion unit that converts the characteristic of the vibration operation of the diaphragm by the actuator is interposed, and the operation characteristic conversion unit has the same liquid inside as the liquid. A cylinder having a cylinder chamber in which is enclosed, a pair of driving-side and driven-side piston members that are arranged to be able to move forward and backward in the cylinder, and bubbles in the cylinder chamber are discharged to the pressure receiving chamber side above the liquid chamber. And a bubble-extracting hole, wherein the drive-side piston member is connected to the actuator so that the base end is vibrated by the actuator.
The pressurizing surface of the tip portion is arranged in the cylinder so as to face the fluid in the cylinder chamber, while the base end portion of the driven side piston member is attached to the diaphragm, and the pressure receiving surface of the tip portion exposes the fluid in the cylinder chamber. Is arranged so as to receive an oscillating actuating force from the drive side piston member via the above-mentioned bubble extraction hole, and penetrates the piston member located above the drive side piston member and the driven side piston member, and the cylinder The chamber and the pressure receiving chamber are formed to communicate with each other, and the resonance frequency of the liquid column through the bubble vent hole is sufficiently lower than the frequency range of the input vibration preset for operating the actuator. The vibration control device is a control type that is set as follows. 2. The control type vibration damping device according to claim 1, wherein the crucible portion for containing air bubbles is formed on the elastic support body so as to face the top of the pressure receiving chamber and open downward. 3. The method of Claim 2, urn portion against the control vibration damping device sufficiently low resonance frequency is set than the set resonance frequency of the liquid column through the orifice. 4. The area of the pressurizing surface of the driving side piston member is set to be smaller than the area of the pressure receiving surface of the driven side piston member, and the operating characteristic converting means sets the vibration actuating force characteristic of the driven side piston member. A control type anti-vibration device that amplifies. 5. The driving characteristic of the driven piston member according to claim 1, wherein the pressing surface area of the driving side piston member is set larger than the pressure receiving surface area of the driven piston member. Controlled anti-vibration device that amplifies the characteristics. 6. The control type vibration damping device according to claim 1, wherein the actuator is composed of a piezoelectric element that expands and contracts by applying and blocking a voltage.