JPH10159893A - Liquid filled vibration proof device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent thermal effect on the dynamic spring constant of an insulator constituting a main spring. SOLUTION: An insulator 2 and a vibration proof mechanism 1 formed in series to the insulator 2 are provided between an upper connection member 6 connected to a vibrator and a lower connection member 9 connected to a body. The second liquid chamber 22 is provided around the insulator 2 and the outer shell of the second liquid chamber 22 is formed with an elastic barrier 21 of heat resistant rubber material. A vibration proof mechanism 1 has a main chamber 12 to fill liquid therein, a sub-chamber 16 connected to the main chamber 12 via an orifice 15, an air room 18 provided under the sub-chamber 16 and a balancing room 13 provided in the main chamber 12 via a diaphragm 11. A switching means 3 to guide negative pressure of atmospheric pressure into the balancing room 13 and a control means 5 to operate the switching means 3 are provided therein.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a liquid-filled type vibration damping device in which a vibration damping effect is obtained based on a flow action of a fluid (liquid) sealed therein. The vibration isolating characteristics exhibited by the flow can be switched to a plurality of stages with a simple mechanism driven by the engine suction negative pressure, and a main spring of such a vibration isolating device is formed. The present invention relates to a liquid-filled vibration isolator in which a liquid chamber is provided around a rubber-like insulator so that a dynamic spring constant is not affected by heat.

[0002]

2. Description of the Related Art Among anti-vibration devices, particularly in engine mounts for automobiles and the like, an engine as a power source is operated under various conditions from an idling operation state to a maximum rotation speed. Since it is used, it must be able to handle a wide range of frequencies. Recently, engine mounts have been tuned for the purpose of cutting off noise caused by vibration in a relatively high frequency range. In order to cope with such a plurality of conditions, a liquid chamber is provided inside, and further, the liquid chamber vibrates at a specific frequency and is driven by the negative suction pressure of the engine. A vibrating device consisting of various mechanisms is provided to cut off various vibrations including idling vibration,
For example, the one shown in FIG. 4 has already been filed by the present applicant (see Japanese Patent Application No. 8-287524).

[0003]

In the above-mentioned prior art, the insulator 20 which forms a main spring is provided with the insulator 20 in the engine room in a bare state, in which the vibration isolating mechanism 10 and the vibration isolating mechanism 10 are intercepted. It is something that is to be done. Therefore, it is affected by high-temperature heat from the engine and is exposed to oxygen in the air. As a result, due to thermal deformation or oxygen deterioration, the dynamic spring constant changes so as to increase. This is because the dynamic spring constant of the liquid-filled vibration isolator tuned to the frequency of the target vibration, such as idling vibration, engine shake, and muffled sound, is initially set. It will fluctuate from the state, which is not preferable. Therefore, as a countermeasure, one way is to provide a so-called feedback control means for measuring the change in the dynamic spring constant and maintaining the optimum tuning state by reflecting the result in the control system. Alternatively, a method is conceivable in which the initial tuning is performed widely in a state where the change in the dynamic spring constant is expected in advance.
However, the former method has a problem that the control system is complicated and the cost is too high. Also,
On the other hand, the latter method has a problem that the tuning cannot be performed optimally and the capability of the apparatus cannot be fully exhibited. Therefore, in order to solve such a problem, the initial optimized tuning state,
It is an object (problem) of the present invention to provide a feed-forward control type automatic control engine mount device (ACM) that can be maintained for a long time.

[0004]

Means for Solving the Problems In order to solve the above problems, the present invention takes the following measures. That is, according to the first aspect of the present invention, the upper connecting member attached to the vibrating body, the lower connecting member attached to a member or the like on the vehicle body, and the upper connecting member and the lower connecting member interposed between the upper connecting member and the lower connecting member. An insulator that absorbs and blocks the vibration of the main body, the main chamber in which a liquid that is an incompressible fluid is sealed, and the liquid is supplied through the main chamber and an orifice. Sub-chamber, fluidly connected,
Further, a vibration-isolation mechanism portion formed through a diaphragm in the main chamber and including an equilibrium chamber or the like formed so that any one of atmospheric pressure and negative pressure is introduced. Switching means for performing a switching operation to introduce one of negative pressure or atmospheric pressure into the equilibrium chamber of the vibration isolation mechanism, control means for controlling the switching operation of the switching means, And a liquid chamber provided outside the insulator, and an elastic diaphragm excellent in heat resistance is provided at the outer periphery of the liquid chamber. I decided that.

[0005] By adopting such a configuration, the present invention has the following effects.
That is, in the thing of the present invention, since the rubber-like elastic diaphragm excellent in heat resistance is provided on the outside of the insulator, the vibration isolator is installed in a high temperature such as an engine room. Even if
The insulator portion made of the vibration-proof rubber material is not directly exposed to high temperatures. In addition, this insulator
Since the liquid chamber is provided around it, its surface does not come into direct contact with atmospheric oxygen. That is, the configuration is excellent in oxygen barrier properties. Therefore, as for the insulator forming the main spring in the present invention, it is not necessary to particularly consider heat resistance and oxygen deterioration, and only the low dynamic spring characteristic may be pursued. As a result, it becomes possible to employ a vibration-proof rubber material mainly composed of ordinary natural rubber, and it is possible to suppress an increase in the dynamic spring constant with respect to high-frequency vibration.

In addition, a portion of the insulator forming the main spring in the vibration isolator is covered with a heat-resistant elastic diaphragm or the like, and its dynamic spring constant varies due to the influence of heat in the engine room. Never come. Therefore, even when used for many years, the initial setting conditions tuned for the purpose of isolating the vibration are shifted (out of alignment).
There is no such thing as saying. As a result, various vibrations including an idling vibration are cut off based on such a dynamic spring constant. Hereinafter, these will be described.

First, with respect to the cutoff of idling vibration, a negative pressure or an atmospheric pressure is alternately introduced at a specific frequency into an equilibrium chamber provided at a lower portion in the main chamber by operating the switching means. Let it do. That is, by operating the switching means at a specific frequency, the pressure (volume) in the equilibrium chamber is changed, whereby the hydraulic pressure fluctuation in the main chamber caused by idling vibration input through the insulator. So that it absorbs. As a result, the dynamic spring constant of the spring system formed by the insulator and the main anti-vibration mechanism is reduced. As a result, idling vibration is cut off.

Next, with respect to an engine shake which is a vibration having a lower frequency than the idling vibration, the liquid is caused to flow through an orifice connecting between the main chamber and the sub-chamber. The engine shake is absorbed and cut off. That is, since the vibration related to the engine shake has a frequency of about 10 Hz, it is difficult to cut off the vibration by reducing the dynamic spring constant. Therefore, in the present invention, a constant negative pressure is continuously introduced into the equilibrium chamber forming the vibration isolation mechanism, the diaphragm forming the equilibrium chamber is pulled down, and the volume of the equilibrium chamber is reduced. Set to zero state. This prevents a change in volume in the equilibrium chamber. In such a state, when the vibration from the vibrating body is propagated to the insulator, the lower surface of the insulator vibrates according to the vibration, and the liquid in the main chamber is positively moved to the sub-chamber side. Operates to flow. As a result, the liquid in the main chamber flows toward the sub chamber through the orifice. A predetermined damping force is generated by the viscous resistance caused by the flow of the liquid, and the engine shake is suppressed (attenuated) by the damping force.

[0009] Further, in response to a high frequency vibration of about 100 Hz to 600 Hz which causes a muffled sound which is a problem during running of the vehicle, the switching means is operated to open the equilibrium chamber to the atmosphere. To As a result, atmospheric pressure is introduced into the equilibrium chamber, and the diaphragm forming the equilibrium chamber freely operates (vibrates). As a result, the liquid in the main chamber relatively freely flows in the main chamber in response to the vibration input from the insulator side. As a result, the dynamic spring constant of the spring system formed by the entire vibration isolator can be kept low. Accordingly, the effect of blocking vibration in a high frequency range is enhanced. As described above, according to the present invention, a plurality of types of vibrations are absorbed and cut off by the operation of the switching means including the switching valve and the like.

Next, the invention according to claim 2 will be described. This is also basically the same as the first aspect. The feature is that a configuration is adopted in which a liquid chamber provided outside the insulator forms a sub-chamber connected to the main chamber via an orifice. Therefore, the elastic diaphragm forming the outer shell of the liquid chamber (sub-chamber) forms a diaphragm, and the space around the elastic diaphragm forms the air chamber in the conventional liquid-filled type vibration damping device. Will be done. By adopting such a configuration, according to the present invention, the liquid-filled type vibration damping device, in which various vibrations including the idling vibration described above can be cut off by feedforward control, in the longitudinal direction thereof, Can be shortened, and the whole vibration isolator can be made compact.

Next, the third aspect of the present invention will be described. This is also basically the same as the first and second aspects. A feature of the present invention is that, in addition to the second aspect, the switching means is provided directly on a rigid plate forming a lower surface of the equilibrium chamber. By adopting such a configuration, similar to the above-described claim 2,
As a result, the communication passage for air introduction provided for introducing a negative pressure or an atmospheric pressure into the equilibrium chamber from the switching valve of the switching means can be achieved. The length can be shortened. As a result, the flow resistance of the fluid is reduced, and the response to the change in the volume of the equilibrium chamber and the vibration of the diaphragm forming the equilibrium chamber can be improved (improved).

[0012]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described with reference to FIGS. Although the present invention relates to an embodiment of the present invention, as shown in FIGS. 1 and 2, an upper connecting member 6 attached to a vibrating body, a lower connecting member 9 attached to a member or the like on a vehicle body, and an upper connecting member An insulator 2 between the member 6 and the lower connecting member 9 for absorbing and blocking the vibration from the vibrator, and an insulator 2 provided in series with the insulator 2 and filled with a liquid that is an incompressible fluid. An anti-vibration mechanism 1 including a liquid chamber formed by a main chamber 12 and a sub-chamber 16
In the equilibrium chamber 13 which forms a part of the vibration isolating mechanism 1 and is provided in the main chamber 12, either one of negative pressure or atmospheric pressure is continuously applied or engine vibration is applied. And a control means 5 for controlling the switching operation of the switching means 3 so as to introduce the liquid alternately in a state in which the liquid is introduced in a synchronized manner. The second liquid chamber (second liquid chamber) 22 is basically provided.

In such a basic configuration, the one relating to the first embodiment (first embodiment) includes, for example,
It has a configuration as shown in FIG. That is,
The insulator 2 is made of a vibration-proof rubber material or the like mainly composed of natural rubber, and one end face of the insulator 2 is integrally connected to the upper connecting member 6 by a vulcanization bonding means or the like. Things. A second liquid chamber 22 is provided outside the insulator 2 so as to surround the insulator 2,
An elastic diaphragm 21 made of EPDM or the like having excellent heat resistance is provided in a portion of the second liquid chamber 22 where the outer shell is formed. The vibration isolator 1 provided in series with the insulator 2 is provided below the insulator 2 continuously with the insulator 2 and has a main chamber 12 in which liquid is sealed. An equilibrium chamber 13 provided at the lower part of the main chamber 12 through the diaphragm 11 and receiving a negative pressure or an atmospheric pressure based on the switching operation of the switching means 3; A sub-chamber 16 in which liquid is sealed, and an orifice 15 connecting between the main chamber 12 and the sub-chamber 16 as in the main chamber 12; It is provided below the sub-chamber 16 through a diaphragm 17 and basically comprises an air chamber 18 into which air is always introduced.

In such a main chamber 12, the diaphragm 11 is provided.
Switching means 3 which operates to introduce negative pressure or atmospheric pressure into the equilibrium chamber 13 provided via
Is composed of a switching valve 31 composed of a three-way valve or the like, and a solenoid 32 for driving the switching valve 31. The switching valve 3 having such a configuration
A throttle valve 35 for adjustment for balancing the introduction speed of the atmospheric pressure with the introduction speed of the negative pressure is provided on the side of the atmospheric pressure introduction port 1.
Is provided. A communication path 19 for introducing the negative pressure or the atmospheric pressure is provided between the switching valve 31 of the switching means 3 and the equilibrium chamber 13.

Next, the switching means 3 having the above configuration
The control means 5 for controlling the switching operation of the microcomputer comprises a microcomputer (CPU) formed on the basis of arithmetic means such as a microprocessor unit (MPU), and detects vibration from a vibrating body such as an engine. The switching operation of the switching means 3 is controlled in accordance with the vibration.

Next, an operation mode and the like of the embodiment having the above-described configuration will be described. That is, the vibration from the vibrating body side is propagated to the insulator 2 made of a rubber material or the like via the upper connecting member 6 as shown in FIG. Along with this, the insulator 2 vibrates or deforms to absorb or cut off most of the input vibration. Therefore, most of the vibrations are cut off at the insulator 2, but some of the vibrations are not cut off at the insulator 2 but cut off at the next vibration isolation mechanism 1. Become. Next, a specific operation of the vibration isolation mechanism 1 will be described. First, by operating the switching means 3 for idling vibration,
A negative pressure or an atmospheric pressure is alternately introduced at a specific frequency into the equilibrium chamber 13 provided in the main chamber 12. That is, by operating the switching means 3 at a specific frequency, the pressure (volume) in the equilibrium chamber 13 is changed.
Fluctuations in the hydraulic pressure in the main chamber 12 caused by idling vibrations input through the controller are absorbed. As a result, the dynamic spring constant of the spring system formed by the insulator 2 and the main vibration isolation mechanism 1 is suppressed to a low value.

In addition, with respect to an engine shake which is a vibration having a lower frequency than the idling vibration, the liquid is caused to flow through an orifice 15 connecting the main chamber 12 and the sub-chamber 16. Thus, absorption and cutoff of the engine shake are performed. That is, the vibration related to the engine shake is about 10H
Since it has a frequency around z, it is difficult to reduce the vibration by reducing the dynamic spring constant. Therefore, in the present embodiment,
As shown in FIG. 1, a constant negative pressure is continuously introduced into the equilibrium chamber 13 forming the vibration isolation mechanism 1, and the first diaphragm forming the equilibrium chamber 13 is pulled down,
The volume of the equilibrium chamber 13 is set to zero. As a result, a change in the volume of the equilibrium chamber 13 is prevented. In such a state, when the vibration from the vibrating body is propagated to the insulator 2, the lower surface of the insulator 2 vibrates in response to the vibration, and the liquid in the main chamber 12 is actively subsided. It operates to flow to the chamber 16 side. As a result, the liquid in the main chamber 12 flows toward the sub chamber 16 through the orifice 15. A predetermined damping force is generated by the viscous resistance caused by the flow of the liquid, and the engine shake is suppressed (attenuated) by the damping force.

On the other hand, the switching means 3 is actuated for high-frequency vibrations of about 100 Hz to 600 Hz which cause a muffled sound which is a problem during running of the vehicle.
The equilibrium chamber 13 is opened to the atmosphere. As a result, atmospheric pressure is introduced into the equilibrium chamber 13, and the first diaphragm 11 forming the equilibrium chamber 13 operates (vibrates) freely. As a result, the liquid in the main chamber 12 relatively freely flows in the main chamber 12 in response to the vibration input from the insulator 2 side. As a result, the dynamic spring constant of the spring system formed by the entire vibration isolator can be kept low.
Accordingly, the effect of blocking vibration in a high frequency range is enhanced.

In the action of blocking various vibrations,
In this embodiment, as shown in FIG. 1, a portion of an insulator 2 forming a main spring of the vibration isolator is provided as follows.
Since it is covered with the second liquid chamber (second liquid chamber) 22 and the elastic diaphragm 21 made of a heat-resistant rubber material,
Compared with the conventional one, the following operation is further exhibited. That is, even when the present liquid-filled type vibration damping device is installed at a high temperature such as an engine room, the portion of the insulator 2 is not directly exposed to the high temperature. Further, since the insulator 2 is provided with the second liquid chamber (second liquid chamber) 22 around it, the surface portion thereof is not directly exposed to oxygen in the atmosphere. Therefore, there is no need to particularly consider heat resistance and oxygen deterioration. As a result, even under such a high temperature, the portion of the insulator 2 forming the main spring of the vibration isolator can be prevented from increasing its dynamic spring constant due to aging or the like. become. Therefore, in this vibration isolator, feedforward control for blocking various vibrations can be performed by using a simple mechanism. Further, the heat-resistant elastic diaphragm 21 provided on the outside of the insulator 2 forms a skin portion for regulating the outer periphery of the second liquid chamber 22 provided around the insulator 2. Therefore, the thickness can be reduced. Further, since the present elastic diaphragm 21 is provided separately and independently from the insulator 2 forming the main spring, the present elastic diaphragm 21 is provided with a spring for the entire liquid-sealed type vibration damping device. It does not affect the constant, especially the dynamic spring constant (dynamic spring characteristic).
From these facts, the dynamic spring constant of the entire liquid-filled type vibration damping device can be kept low, and the dynamic spring constant can be prevented from fluctuating under the influence of heat. become able to.

Next, a second embodiment (second embodiment) of the present invention will be described with reference to FIG. This is also basically the same as that described in the first embodiment. That is, a sub-chamber 16 connected to the main chamber 12 through the orifice 15 is formed by a liquid chamber provided outside the insulator 2. Therefore, the elastic diaphragm 21 forming the outer shell of the liquid chamber (sub-chamber) 16 forms the diaphragm 17, and the space around the elastic diaphragm 21 (17) is the space of the first embodiment. The air chamber 18 is formed.

Further, the elastic diaphragm 2 having such a configuration
As shown in FIGS. 1 to 3, the upward extension of 1 (17) forms a ring-shaped rubber block 25 at the shoulder of the upper connecting member 6. This serves as a rebound stopper in the vibration isolator. Further, in the present embodiment, the sub-chamber 16 is formed around the insulator 2, which is a position above the main chamber 12, so that the lower part of the main chamber 12 is formed. In the lower part of the equilibrium chamber 13 provided in the first embodiment, the partition plate 14 in the first embodiment is unnecessary, and therefore, a rigid plate 141 is provided instead. A communication path 19 for introducing a negative pressure or an atmospheric pressure into the equilibrium chamber 13 is provided at the rigid plate 141.
The switching valve 31 of the switching means 3 is connected to one end of the communication path 19. By adopting such a configuration, in the present embodiment, the liquid-filled type vibration damping device capable of cutting off various vibrations including the idling vibration by feedforward control is provided in the longitudinal direction. Can be shortened. That is, the entire liquid-sealed type vibration damping device can be made compact.

Next, a third embodiment (third embodiment) of the present invention will be described with reference to FIG. This is also basically the same as the second embodiment. The feature is that, in addition to the features of the second embodiment, the switching means 3 is directly attached to a rigid plate 141 which forms the lower surface of the equilibrium chamber 13. It is. By adopting such a configuration, the present liquid-filled type vibration damping device can be made compact, and a negative pressure or an atmospheric pressure can be introduced from the switching valve 31 of the switching means 3 into the equilibrium chamber 13. Can be reduced in length of the communication passage 19 for introducing air provided for introducing air. As a result, the flow resistance of the fluid is reduced, and the response to the change in volume in the equilibrium chamber 13 and the vibration of the diaphragm 11 forming the equilibrium chamber 13 can be improved (improved).

[0023]

According to the present invention, the upper connecting member attached to the vibrating body, the lower connecting member attached to a member or the like on the vehicle body side, and the upper connecting member and the lower connecting member interposed between the upper connecting member and the lower connecting member. An insulator that absorbs and blocks vibrations of the main body, a main chamber that is provided in series with the insulator and in which a liquid that is an incompressible fluid is sealed, and the liquid flows through the main chamber and the orifice. The sub-chamber, which is connected to the main chamber, and the main chamber are formed through a diaphragm, and are formed so that any one of the atmospheric pressure and the negative pressure is introduced. A vibration isolating mechanism comprising a chamber or the like; switching means for performing a switching operation to introduce one of the negative pressure or the atmospheric pressure into the equilibrium chamber of the vibration isolating mechanism; And control means for controlling the switching operation of the unit, with respect to fluid-filled vibration-proof device consisting of, as well as to provide a liquid chamber on the outside of the insulator,
Since the configuration is adopted in which an elastic diaphragm excellent in heat resistance is provided at the place where the outer shell of the liquid chamber is formed, based on the operation of the switching means by the control action of the control means, various vibration inputs Thus, the fluctuation of the hydraulic pressure in the main chamber can be controlled, and finally, the dynamic spring constant of the liquid-filled type vibration damping device can be reduced, and further, a high damping characteristic in a low frequency range can be formed. Was. As a result, it has become possible to cut off various vibrations including idling vibration.

Further, according to the present invention, since a rubber-like heat-resistant elastic diaphragm is provided on the outside of the insulator, the present liquid-filled vibration damping device can be used in a high temperature environment such as an engine room. In this case, the insulator portion made of the vibration-proof rubber material is no longer directly exposed to high temperatures. Further, since the liquid chamber is provided around the insulator, the surface of the insulator does not directly come into contact with oxygen in the atmosphere. Therefore, as the insulator forming the main spring in the present invention, it is not necessary to particularly consider heat resistance and oxygen deterioration, and only the low dynamic spring characteristic has to be pursued. As a result, it is possible to use a vibration-proof rubber material mainly composed of ordinary natural rubber, and it is possible to suppress an increase in the dynamic spring constant with respect to high-frequency vibration.

The portion of the insulator which forms the main spring in the vibration isolator is covered with a heat-resistant elastic diaphragm or the like, and its dynamic spring constant fluctuates due to heat in the engine room. Things have disappeared. Therefore, even when used for many years, the initial set value does not deviate (is deviated), and various kinds of vibrations such as idling vibration can be cut off by a simple feedforward control means. You can now plan.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view showing an entire configuration of a first embodiment which is a basic mode of the present invention.

FIG. 2 is a longitudinal sectional view showing an entire configuration of a second embodiment of the present invention.

FIG. 3 is a longitudinal sectional view showing an entire structure of a third embodiment of the present invention.

FIG. 4 is a longitudinal sectional view showing the entire configuration of a conventional example.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Vibration-proof mechanism part 11 Diaphragm 12 Main chamber 13 Balancing chamber 14 Partition plate 141 Rigid plate 15 Orifice 16 Sub-chamber 17 Diaphragm 18 Air chamber 19 Communication path 2 Insulator 21 Elastic diaphragm 22 Second liquid chamber (Second liquid chamber) Reference Signs List 25 stopper 3 switching means 31 switching valve 32 solenoid 35 throttle valve 5 control means 6 upper connecting member 9 lower connecting member

Claims (3)

[Claims] 1. An upper connecting member attached to a vibrating body, a lower connecting member attached to a member or the like on a vehicle body side, and a vibration interposed between the upper connecting member and the lower connecting member for absorbing and blocking vibration from the vibrating body. And an insulator provided in series with the insulator, wherein the main chamber in which a liquid that is an incompressible fluid is enclosed, and the main chamber and the orifice are connected so that the liquid flows through the orifice. A vibration isolator comprising a sub-chamber and an equilibrium chamber formed through the diaphragm in the main chamber through which one of atmospheric pressure and negative pressure is introduced. A mechanism, switching means for performing a switching operation to introduce either negative pressure or atmospheric pressure into the equilibrium chamber of the vibration isolation mechanism, and controlling a switching operation of the switching means. Control means, and a liquid-filled type vibration damping device, comprising: providing a liquid chamber outside the insulator, and providing an elastic diaphragm excellent in heat resistance in a place where an outer shell of the liquid chamber is formed. A liquid-filled type vibration damping device characterized by the following. 2. The liquid-filled type vibration damping device according to claim 1, wherein a sub-chamber connected to the main chamber via an orifice is formed by a liquid chamber provided outside the insulator. Characteristic liquid-filled vibration damping device. 3. The liquid-filled vibration damping device according to claim 2, wherein the switching means is directly installed at a rigid plate forming a lower surface of the equilibrium chamber, whereby the equilibrium chamber is provided. A liquid-filled type vibration damping device characterized in that the length of a communication path for introducing a negative pressure or an atmospheric pressure into the fluid is reduced.