JP3533912B2 - 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 damping device,
In particular, the present invention relates to a vibration damping device that can obtain a vibration damping effect based on the flow of a liquid enclosed inside.

[0002]

2. Description of the Related Art An engine, which is a vibrating body, is used under various operating conditions from the idling operation state to the maximum rotation speed. Therefore, among the anti-vibration devices, especially for automobile engine mounts,
It must be able to handle a wide range of frequencies. For this reason, a so-called liquid-filled engine mount (vibration isolator) has been proposed in which two liquid chambers are provided inside and an orifice is connected between them (Japanese Patent Laid-Open No. 60231/1992).

By the way, the above-mentioned known technique is configured to have two orifices in order to cope with two types of input vibrations in a low frequency range. By operating these orifices, it is possible to deal with two kinds of vibrations, for example, idling vibration and engine shake.

However, the frequency of these vibrations is 1
Although it is around 0 Hz to 30 Hz, the actual engine is used under various driving conditions as described above, and the frequency range of vibration and noise propagated into the vehicle compartment through the engine mount is wide. Has become. Particularly, in recent years, vibrations and noises relating to engine noise such as "muffled noise", which is a vibration in a relatively high frequency range, have become a problem.

As described above, the applicant of the present application has already proposed the following anti-vibration device in order to cut off vibrations in a relatively high frequency range. That is, this vibration isolator includes a vibration isolator (engine mount), switching means [vacuum switching valve (hereinafter referred to as "VSV")], and control means for controlling the switching means. The vibration isolator includes a connector attached to the engine as a vibrating body, a holder attached to the vehicle body side, an insulator provided between the connector and the holder for absorbing vibration from the vibrating body, And an anti-vibration mechanism section continuously provided to the insulator. Further, the vibration isolation mechanism part has its own wall chamber formed in a part of the insulator, and the main liquid chamber in which the liquid is sealed, and the liquid flows through the orifice into the main liquid chamber. The sub-liquid chamber connected to the main liquid chamber, the equilibrium chamber formed in a part of the main liquid chamber through the diaphragm, and the equilibrium chamber formed so that the volume of the chamber itself changes The
It has an air chamber into which air is constantly introduced.

In the vibration isolator, the control means controls the switching means so that negative pressure and atmospheric pressure are alternately introduced into the equilibrium chamber at a specific frequency. For example, for engine idling vibration,
By the switching operation of the switching means, the negative pressure and the atmospheric pressure are alternately introduced at the frequency corresponding to the idling vibration, and the pressure in the equilibrium chamber, and thus the volume, changes accordingly. Then, due to such a volume change, fluctuations in the liquid pressure in the main liquid chamber, which are generated by idling vibration and are input via the insulator, are positively controlled and absorbed. As described above, according to the above technique, it is possible to correspond to an arbitrary frequency by controlling the switching unit by the control unit.

[0007]

However, the following problems may occur only with the above technique. That is,
Essentially, it is desirable that the pressure fluctuation in the equilibrium chamber be one that behaves smoothly like a sine wave. However, since the switching means is constituted by VSV or the like and is switched on and off , the pressure in the equilibrium chamber is equal to VSV.
With the changeover, the variation behavior as shown in FIG. 8 is exhibited ,
Therefore , a harmonic component is generated and an unnecessary wave is mixed. Therefore, the pressure fluctuation in the equilibrium chamber may be different from the ideal one, and it may be difficult to completely offset the hydraulic pressure fluctuation in the main liquid chamber in accordance with the vibration of the vibrating body (engine). was there. As a result, the occupant may feel vibration even though the occupant is provided with the anti-vibration device.

The present invention has been made to solve the above problems, and an object thereof is to prevent vibrations generated in a vibrating body from propagating into a vehicle interior more reliably. To provide a device.

[0009]

In order to achieve the above object, in the invention described in claim 1, a connecting member attached to the vibrating body, a holder attached to the vehicle body side, and the connecting member and the holder are provided between them. An insulator for absorbing vibrations from the vibrating body, and a vibration isolating mechanism portion continuously provided on the insulator, wherein the vibration isolating mechanism portion is a wall of the insulator itself. chamber is formed, the internal encapsulation of liquid has been main liquid chamber, the main liquid chamber
A sub liquid chamber provided below through a partition plate and connected to the main liquid chamber through an orifice so that the liquid flows.
A vibration isolator , which is provided via a diaphragm attached to the upper surface of the partition plate, and which includes an equilibrium chamber formed so that the volume of its own room changes ; Requests made to synchronize
Based on the frequency , switching means for switching the negative pressure introduced from the negative pressure source and the atmospheric pressure introduced from the atmospheric pressure inlet to the equilibrium chamber, and the switching means are controlled. and control means for said balancing chamber
Alternately introducing negative pressure and atmospheric pressure at the required frequency
In the vibration damping device adapted to absorb the fluctuation of the hydraulic pressure in the main liquid chamber by means of the above, a separate accommodating space is provided in the middle of the communication passage communicating between the switching means and the equilibrium chamber. I am trying.

The invention according to claim 2 is characterized in that, in the vibration isolator according to claim 1, the accommodation space is a side branch whose front end is closed.

Further, in the invention according to claim 3, in the vibration isolator according to claim 2, the switching means is a vacuum switching valve, and the side branch is provided in the vacuum switching valve. Is the gist.

In addition, in the invention according to claim 4, in order to absorb the vibration from the vibrating body, the coupling is mounted on the vibrating body, the holder is mounted on the vehicle body side, and is provided between the coupling and the holder. And an anti-vibration mechanism section continuously provided to the insulator, wherein the anti-vibration mechanism section has its own wall chamber formed in a part of the insulator, and a liquid is sealed inside. A main liquid chamber, a sub liquid chamber provided below the main liquid chamber via a partition plate and connected to the main liquid chamber via an orifice so that the liquid flows, and an upper surface of the partition plate. Installed
And a vibration isolator , which is provided via a diaphragm and includes an equilibrium chamber formed so that the volume of its own room changes, and a vibration isolator for synchronizing with the vibration of the vibration body.
Switching means for switching the negative pressure introduced from the negative pressure source and the atmospheric pressure introduced from the atmospheric pressure inlet into the equilibrium chamber alternately based on the required frequency. And a control means for controlling the switching means ,
Alternate negative pressure and atmospheric pressure in the equilibrium chamber at the required frequency
By introducing it, it absorbs the fluctuation of liquid pressure in the main liquid chamber.
In the vibration isolator thus configured, a resistance is provided in the middle of the communication passage that communicates between the switching means and the equilibrium chamber so as to moderate the introduction of negative pressure and atmospheric pressure into the equilibrium chamber. That is the point.

In addition, in the invention according to claim 5, in the vibration isolator according to any one of claims 1 to 4, the vibrating body is an engine mounted on a vehicle body, and the negative pressure is applied. The gist of the source is that it is based on the negative pressure generated on the downstream side of the throttle valve provided in the middle of the intake passage of the engine.

[0014] In the invention described in claim 6, a vibration damping apparatus according to claim 5, wherein the request frequency, the
The gist is that it is required to synchronize the alternating introduction of the negative pressure and the atmospheric pressure with the idling vibration of the engine.

(Operation) According to the first aspect of the present invention, the vibrations propagated from the vibrating body by the insulator provided between the connecting member mounted on the vibrating body and the holder mounted on the vehicle body side. Much of it is absorbed. In addition, the vibration is further controlled by the anti-vibration mechanism section that is provided continuously to the insulator,
Be absorbed. That is, the liquid enclosed in the main liquid chamber and the sub liquid chamber flows through the orifice due to the vibration, and the vibration is controlled and absorbed by the flow. Further, the same time, the equilibrium chamber provided via da Iyafuramu, atmospheric pressure is introduced from the negative pressure and atmospheric pressure inlet is introduced from the negative pressure source is introduced alternately. This introduction is performed by the switching means, which is controlled by the control means, performing a switching operation based on the required frequency required to synchronize with the vibration of the vibrating body. Due to this alternate introduction, negative pressure and atmospheric pressure are introduced alternately at a frequency corresponding to the required frequency, and the pressure in the equilibrium chamber, and consequently the volume, changes accordingly. The change in volume causes the vibration of the vibrating body, and the fluctuation in the hydraulic pressure in the main liquid chamber input through the insulator is positively controlled and absorbed.

Here, since the switching means is switched by switching, there is a possibility that a harmonic component may be generated due to the switching. On the other hand, in the present invention, a separate accommodating space is provided in the middle of the communication passage that communicates between the switching means and the equilibrium chamber. Therefore, due to the existence of the accommodation space, pulsation occurs when negative pressure and atmospheric pressure are introduced, and the resonance effect of the pulsation shapes the pressure waveform,
As a result, unnecessary harmonic components are removed.
Further, the existence of the accommodation space makes the rising speed and the falling speed of the pressure in the equilibrium chamber slow. Therefore, the pressure fluctuation in the equilibrium chamber behaves more smoothly like a sine wave, and it becomes possible to control the liquid pressure fluctuation in the main liquid chamber in accordance with the vibration of the vibrating body.

According to the second aspect of the invention, the accommodation space is a side branch whose tip is closed. Therefore, the invention described in claim 1 can be reliably achieved.

Further, according to the invention of claim 3,
In addition to the function of the invention described in claim 2, the switching means is a vacuum switching valve, and the side branch is provided in the vacuum switching valve. Therefore, the distance between the vacuum switching valve and the equilibrium chamber becomes relatively short. Therefore,
Negative pressure and atmospheric pressure are more likely to be reliably introduced into the equilibrium chamber. Therefore, the operation of the anti-vibration mechanism section becomes more reliable.

Further, since the side branch is directly provided to the vacuum switching valve, a joint for separately mounting the side branch is not required in the middle of the communication passage. Therefore, the number of parts can be reduced, and the assembling work can be simplified.

In addition, according to the invention of claim 4,
Basically, the same operation as the invention according to claim 1 is achieved. That is, the resistance is provided in the middle of the communication passage that communicates between the switching means and the equilibrium chamber. Due to the presence of this resistance, the rising speed and the falling speed of the pressure in the equilibrium chamber become slow. Therefore, the pressure fluctuation in the equilibrium chamber behaves more smoothly like a sine wave, and it becomes possible to control the liquid pressure fluctuation in the main liquid chamber in accordance with the vibration of the vibrating body.

Further, according to the invention of claim 5,
In addition to the effects of the invention described in claims 1 to 4, since the vibrating body is an engine mounted on a vehicle body, it is possible to effectively control and absorb vibration generated in the engine. The negative pressure source is based on the negative pressure generated on the downstream side of the throttle valve provided in the middle of the intake passage of the engine. Therefore, the intake system of a normal engine can be used, and it is not necessary to provide a separate negative pressure source.

In addition, according to the invention of claim 6,
In addition to the function of the invention described in claim 5, the required frequency is obtained so as to be synchronized with the idling vibration of the engine. Therefore, in particular, it becomes possible to effectively control and absorb the idling vibration of the engine.

[0023]

DETAILED DESCRIPTION OF THE INVENTION

(First Embodiment) A first embodiment of the present invention will be described below with reference to the drawings.

FIG. 2 is a schematic diagram showing the engine system of this embodiment. The engine 1 as a vibrating body is mounted on the vehicle body through a plurality of engine mounts 2 and 3 as a vibration isolator. The engine mount 2 provided on the rear side is a liquid-filled type that has been generally used in the past, and a detailed description thereof will be omitted here. Further, the engine mount 3 provided on the front side is a liquid-filled type and has a configuration in which negative pressure and atmospheric pressure can be introduced alternately, which will be described in detail later. And

As shown in FIG. 1, the engine 1 has a plurality of combustion chambers 4 (for example, V type 6 cylinders in this embodiment), and each combustion chamber 4 has an air cleaner 5 and an intake passage. Intake air is introduced through 6. Further, a throttle valve 7 is provided in the middle of the intake passage 6, and the flow rate of intake air flowing through the intake passage 6 is adjusted by opening / closing the throttle valve 7. Further, a fuel injection valve (not shown) is provided at a port in the intake passage 6 immediately before the combustion chamber 4, and a combustible mixture is formed by the fuel injected from the injection valve and the intake air. The air is introduced into the combustion chamber 4. Since the structure of the engine 1 itself is a well-known technique, further description is omitted here.

Next, the structure of the engine mount 3 will be described. As shown in FIG. 1, the engine mount 3
Is provided between the connecting metal fitting 11 and the holder 12 as a connecting tool that is attached to the engine 1, a holder 12 that is attached to the vehicle body side, and mainly absorbs vibrations propagated from the engine 1. It is provided with an insulator 13 and a vibration isolation mechanism portion 14 provided continuously to the insulator 13. The insulator 1
3 is made of a vibration-proof rubber material, and the above-mentioned connecting fitting 1
It is integrally connected to 1 by vulcanization adhesion or the like. Further, the vibration isolation mechanism portion 14 has its own wall chamber formed in a part of the insulator 13, the main liquid chamber 15 in which liquid is sealed, and the liquid through the orifice 16 in the main liquid chamber 15. A sub-liquid chamber 17 that is fluidly connected to the main liquid chamber 15; An air chamber 21 that is provided around the sub liquid chamber 17 (on the lower side) via a second diaphragm 20 and into which air is constantly introduced is provided. In addition, the main liquid chamber 15 and the sub liquid chamber 1
A partition plate 22 partitions the space from the space 7.

Further, the equilibrium chamber 19 has a communication passage 23.
Is provided, and one end of this communication passage 23 has a vacuum switching valve (VSV) 3 that constitutes a switching means.
It is connected to 1. The VSV 31 is a three-way valve that is switched on / off by a solenoid 32, for example, and has first, second and third ports 33, 34, 35. The first port 33 is connected to the communication passage 2 as described above.
3 is connected to the equilibrium chamber 19. Also, in FIG.
As shown in FIG. 2, the second port 34 has an atmospheric pressure line 36.
Through the intake passage 6 upstream of the throttle valve 7.
Is in communication with. Further, the third port 35 is connected to the intake passage 6 (surge tank) downstream of the throttle valve 7 via a negative pressure pipe 37. A vacuum tank 38 as a negative pressure source is provided in the middle of the negative pressure line 37.
Is provided, and the vacuum tank 38 constantly stores the negative pressure generated downstream of the throttle valve 7.

Further, the VSV 31 is controlled by a central processing control unit (CPU) 41 as a control means.
This CPU 41 is, for example, VS for each preset cycle.
A signal indicating that V31 is turned on / off is output. And
When the ON signal is output from the CPU 41, the first
The port 33 and the second port 34 are in communication with each other,
Intake air (atmospheric pressure) upstream of the throttle valve 7 is introduced into the equilibrium chamber 19. Conversely, the CPU 41
When the off signal is output by the first port 3
3 and the third port 35 are in communication with each other, and the equilibrium chamber 19
Intake air (negative pressure) generated downstream of the throttle valve 7 and stored in the vacuum tank 38 is introduced into the. In the present embodiment, the engine mount 3, the VSV 31, and the CPU 41 constitute a vibration isolation device.

Next, the characteristic part of this embodiment will be described. In the present embodiment, a three-way joint 50 is provided in the middle of the communication passage 23 that connects the first port 33 of the VSV 31 and the equilibrium chamber 19, and one port of the joint 50 accommodates the housing. Side branch 51 that makes up the space
Is provided. The side branch 51 is formed into a tubular shape (preferably having a diameter of 2 mm or more) so as to branch from the communication passage 23, and the tip end portion thereof is closed. Further, in the present embodiment, the length L of the side branch 51 is set so as to satisfy the following equation.

0.85c / 4f ′ ≦ L ≦ 1.15c / 4f ′ Note that c is the speed of sound [340 m / sec], and f ′ corresponds to the harmonic component at the required frequency (for example, idling frequency). The frequency [Hz] is shown.

Next, the operation and effect of the present embodiment configured as described above will be described. In the above embodiment, first, the insulator 13 absorbs most of the vibration propagated from the engine 1. Further, a vibration isolation mechanism portion 14 provided continuously to the insulator 13
This further controls and absorbs vibration. That is, the liquid sealed in the main liquid chamber 15 and the sub liquid chamber 17 flows through the orifice 16 due to the vibration, and the vibration controls and absorbs the vibration.

・ Along with this, the equilibrium chamber 1 provided in a part of the main liquid chamber 15 via the first diaphragm 18
Negative pressure from the vacuum tank 38 and the negative pressure line 37 and atmospheric pressure from the atmospheric pressure line 36 are alternately introduced into 9. Then, this introduction is performed by the VSV 31 controlled by the CPU 41 performing a switching operation based on the required frequency f (e.g., equivalent to the idling frequency) f required to synchronize with the vibration of the engine 1. . By this switching, the negative pressure and the atmospheric pressure are alternately introduced with the frequency corresponding to the required frequency f, and the pressure in the equilibrium chamber 19 and, consequently, the volume are changed accordingly. And
Due to such a volume change, the fluctuation of the hydraulic pressure in the main liquid chamber 15 that is generated by the vibration of the engine 1 and is input through the insulator 13 is positively controlled and absorbed.

Since the VSV 31 is switched by switching, a harmonic component may be generated due to the switching. In contrast,
In the present embodiment, the side branch 51 is provided in the middle of the communication passage 23. Therefore, pulsation may occur in the atmospheric pressure and the negative pressure introduced from the atmospheric pressure conduit 36 and the negative pressure conduit 37, respectively. Then, as shown in FIG. 3, the pressure waveform is shaped by the resonance effect of the pulsation, and as a result, unnecessary harmonic components are removed. Further, due to the presence of the side branch 51, the rising speed and the falling speed of the pressure in the equilibrium chamber 19 become slow. Therefore,
The pressure fluctuation in the equilibrium chamber 19 behaves more smoothly like a sine wave, and consequently the hydraulic pressure fluctuation in the main liquid chamber 15 can be controlled in accordance with the vibration of the engine 1.
As a result, the occupant can more reliably suppress the vibration generated in the engine 1 from propagating into the vehicle interior by the vibration isolator.

Further, according to the present embodiment, by setting the length L of the side branch 51 so as to satisfy the above equation, the generated pulsation is set so that harmonic components are removed. can do. Therefore, the above-mentioned effects can be made more reliable.

Further, in the present embodiment, the present invention is applied when the engine 1 mounted on the vehicle body is a vibrating body. Therefore, the vibration generated in the engine 1 can be effectively controlled and absorbed.

In addition, according to the present embodiment, as the negative pressure source, a negative pressure source based on the negative pressure generated on the downstream side of the throttle valve 7 provided in the intake passage 6 of the engine 1 is used. I decided. Therefore, the normal intake system of the engine 1 can be used, and it is not necessary to provide a separate negative pressure source. As a result, an increase in cost can be suppressed.

In addition, according to the present embodiment, the required frequency f is synchronized with the idling vibration of the engine 1. Therefore, particularly, idling vibration of the engine 1 can be effectively controlled and absorbed.

(Second Embodiment) A second embodiment of the present invention will be described below. However, since the basic configuration and the like of this embodiment are the same as those of the above-described first embodiment, the same members and the like are designated by the same reference numerals and the description thereof will be omitted. Then, the difference from the first embodiment will be mainly described below.

As shown in FIG. 4, the present embodiment is characterized in that the three-way joint 50 is not provided in the communication passage 23. That is, VSV31
Has an A port 42, a B port 43, a C port 44, and a D port 45 in its housing. The communication passage 23 is connected to the A port 42, and VSV3
The negative pressure and the atmospheric pressure from the first port 33 of the body of No. 1 are A
It is adapted to be supplied to the equilibrium chamber 19 through the port 42 and the communication passage 23. An atmospheric pressure pipe 36 is connected to the B port 43. Further, the negative pressure pipe 37 is connected to the C port 44. Together with the A port 42, the D port 45 communicates with the first port 33 inside the VSV 31. And
The D port 45 is provided with a rubber side branch 51.

According to the present embodiment, in addition to the actions and effects of the above-described first embodiment, the following actions and effects are exhibited. That is, since the D port 45 is provided in the VSV 31 and the side branch 51 is directly provided in the D port 45, the three-way joint 50 for providing the side branch 51 can be omitted. Therefore, the three-way joint 50
The length of the communication passage 23, that is, the distance between the first port 33 and the equilibrium chamber 19 can be shortened by the amount that does not need to be provided. As a result, the negative pressure and the atmospheric pressure are more likely to be reliably introduced into the equilibrium chamber 19. Therefore, the action of the vibration isolation mechanism portion 14 can be exhibited more reliably.

Since the three-way joint 50 does not have to be provided, the number of parts can be reduced and the assembling work can be simplified. (Third Embodiment) The third embodiment of the present invention will be described below. However, in the basic configuration and the like of the present embodiment, members and the like that are equivalent to those of the above-described first embodiment are given the same reference numerals, and description thereof will be omitted. Then, in the following, differences from the first and second embodiments will be mainly described.

As shown in FIG. 5, in the present embodiment, instead of the side branch 51, a foam 52 as a breathable resistor is provided in the middle of the communication passage 23.

Also in the present embodiment, basically, the same operational effect as that of the first embodiment can be obtained. That is, due to the presence of the foam body 52 provided in the middle of the communication passage 23 that communicates between the VSV 31 and the equilibrium chamber 19, the rising speed and the falling speed of the pressure in the equilibrium chamber 19 become slow. Therefore, the pressure fluctuation in the equilibrium chamber 19 behaves more smoothly like a sine wave, and consequently the liquid pressure fluctuation in the main liquid chamber 15 can be controlled in accordance with the vibration of the engine 1. As a result, the same effect as that of the first embodiment can be obtained.

The present invention is not limited to the above-mentioned respective embodiments, and a part of the constitution can be appropriately modified within the scope not departing from the gist of the invention and can be carried out as follows. (1) In the third embodiment described above, the foam body 52 as a resistance is provided in the middle of the communication passage 23, but any other material can be used as long as it can resist the pressure fluctuation of the communication passage 23. May be used. For example, as shown in FIG. 6, an orifice 53 may be provided in the communication passage 23 and used as the resistance. Further, as shown in FIG. 7, a porous nozzle 54 may be provided in the communication passage 23.

(2) In addition, in the first embodiment,
Although the side branch 51 is provided to form the accommodation space, a configuration such as a box-shaped resonator may be provided instead. Even with such a configuration, excellent resonance performance can be ensured by the resonance effect as described above.

(3) Furthermore, in the embodiment, the case of the engine 1 is embodied as the vibrating body, but it may be applied to a vibration isolator for another vibrating body. (4) In the above embodiment, the engine 1 is used as the negative pressure source.
The vacuum tank 38 for storing the negative pressure generated at the downstream side of the throttle valve 7 provided in the middle of the intake passage 6 is provided, but a negative pressure source (for example, a vacuum pump) that separately generates negative pressure is used. May be

(5) In the above embodiment, the connecting fitting 11 is used as the connecting tool, but it may be made of another material (for example, a high-strength resin material). (6) In the above-mentioned embodiment, the vibration-proof rubber material is used as the insulator 13. However, another material (for example, elastic resin material) may be used as long as it has a predetermined elasticity and has a characteristic of absorbing vibration. You may comprise.

[0048]

As described in detail above, according to the anti-vibration device of the present invention, it is possible to more reliably suppress the vibration generated in the vibrating body from propagating into the vehicle interior. Play.

[Brief description of drawings]

FIG. 1 is a cross-sectional view showing an engine mount and the like according to a first embodiment.

FIG. 2 is a configuration diagram schematically showing an engine vibration isolation system.

FIG. 3 is a timing chart showing the behavior of VSV and pressure in the equilibrium chamber with respect to the passage of time.

FIG. 4 is an enlarged cross-sectional view showing a main part of the second embodiment.

FIG. 5 is an enlarged cross-sectional view showing the main parts of the third embodiment.

FIG. 6 is an enlarged sectional view showing a main part of another embodiment.

FIG. 7 is an enlarged cross-sectional view showing a main part of another embodiment.

FIG. 8 is a timing chart showing the behavior of VSV and the pressure in the equilibrium chamber with respect to the passage of time in the related art.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Engine as a vibrating body, 3 ... Engine mount as a vibration isolator, 6 ... Intake passage, 7 ... Throttle valve, 11
... connecting fittings as connecting tools, 12 ... holders, 13 ... insulators, 14 ... anti-vibration mechanism section, 15 ... main liquid chamber, 16 ...
Orifice, 17 ... Sub liquid chamber, 18 ... First diaphragm, 19 ... Equilibrium chamber, 20 ... Second diaphragm, 21 ...
Air chamber, 22 ... Partition plate, 23 ... Communication passages 23, 31 ... VSV as switching means, 36 ... Atmospheric pressure pipeline, 37 ... Negative pressure pipeline, 38 ... Vacuum tank as negative pressure source, 41 ... As control means CPU, 51 ... Side branch, 52 ...
Foam as resistance, 53 ... Orifice as resistance,
54 ... Nozzle as resistance.

─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Tatsuo Suzuki No. 1 Nagahata, Ochiai, Kasuga-cho, Nishikasugai-gun, Aichi Toyoda Gosei Co., Ltd. (72) Sadaki Shimoda, Ochiai, Kasuga-cho, Nishi-Kasugai, Aichi 1 Address: Toyoda Gosei Co., Ltd. (72) Inventor: Shigeki Takeo, Ochiai, Nagahata, Ojiai, Kasuga-cho, Nishikasugai-gun, Aichi Prefecture (56) Reference: JP-A-5-79529 (JP, A) JP-A-6 -193670 (JP, A) JP-A-3-125045 (JP, A) JP-A-10-38018 (JP, A) JP-A-10-184773 (JP, A) Actual development Sho-60-104310 (JP, U) ) (58) Fields investigated (Int.Cl. ⁷ , DB name) F16F 13/00-13/30

Claims (6)

(57) [Claims] 1. A connecting member attached to a vibrating body, a holder attached to a vehicle body side, an insulator provided between the connecting member and the holder for absorbing vibration from the vibrating body, and continuous with the insulator. An anti-vibration mechanism provided,
-Proof oscillating mechanism portion, said own wall chamber in some insulator is formed, the main liquid chamber which is sealed in a liquid therein, said main
A sub-liquid chamber that is provided below the liquid chamber via a partition plate and is connected to the main liquid chamber via an orifice so that the liquid flows, and a diamond attached to the upper surface of the partition plate. > A vibration isolator , which is provided via a flam and includes an equilibrium chamber formed so that the volume of its own room changes, and a required vibration required to synchronize with the vibration of the vibrating body.
Based on the number, switching means for performing switching operation to alternately introduce a negative pressure introduced from a negative pressure source and an atmospheric pressure introduced from an atmospheric pressure suction port into the equilibrium chamber, and the switching means are controlled. and control means, a negative pressure and atmospheric pressure into the equilibrium chamber alternately the request frequency
By introducing it, it absorbs the fluctuation of liquid pressure in the main liquid chamber.
In the vibration isolator thus configured , a separate accommodating space is provided in the middle of a communication path that communicates between the switching means and the equilibrium chamber. 2. The vibration isolator according to claim 1, wherein the accommodation space is a side branch whose front end is closed. 3. The vibration isolator according to claim 2, wherein the switching means is a vacuum switching valve, and the side branch is provided in the vacuum switching valve. 4. A connecting member attached to the vibrating body, a holder attached to the vehicle body side, an insulator provided between the connecting member and the holder for absorbing vibration from the vibrating body, and continuous to the insulator. An anti-vibration mechanism provided,
-Proof oscillating mechanism portion, said own wall chamber in some insulator is formed, the main liquid chamber which is sealed in a liquid therein, said main
A sub-liquid chamber that is provided below the liquid chamber via a partition plate and is connected to the main liquid chamber via an orifice so that the liquid flows, and a diamond attached to the upper surface of the partition plate. > A vibration isolator , which is provided via a flam and includes an equilibrium chamber formed so that the volume of its own room changes, and a required vibration required to synchronize with the vibration of the vibrating body.
Based on the number, switching means for performing switching operation to alternately introduce a negative pressure introduced from a negative pressure source and an atmospheric pressure introduced from an atmospheric pressure suction port into the equilibrium chamber, and the switching means are controlled. and control means, a negative pressure and atmospheric pressure into the equilibrium chamber alternately the request frequency
By introducing it, it absorbs the fluctuation of liquid pressure in the main liquid chamber.
In the vibration isolator thus configured, a resistance for slowing the introduction of negative pressure and atmospheric pressure into the equilibrium chamber is provided in the middle of the communication passage that communicates between the switching means and the equilibrium chamber. Anti-vibration device characterized by 5. The vibrating body is an engine mounted on a vehicle body, and the negative pressure source supplies negative pressure generated at a downstream side of a throttle valve provided midway in an intake passage of the engine. The anti-vibration device according to any one of claims 1 to 4, which is based. 6. The required frequency is the negative pressure and the atmospheric pressure.
6. The alternate introduction is required to synchronize with the idling vibration of the engine.
The anti-vibration device described in.