JP3570118B2 - Liquid filled type vibration damping device - Google Patents

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a liquid-sealed type vibration damping device capable of obtaining a vibration damping effect based on a flow of a fluid (liquid) sealed therein, and in particular, to a vibration damping device exhibited with the flow of a liquid. BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a liquid-filled type vibration damping device in which vibration characteristics can be switched to a plurality of stages with a simple structure and low dynamic spring characteristics can be obtained even in a high frequency range.
[0002]
[Prior art]
Among the vibration isolators, especially in the case of engine mounts for automobiles, the engine, which is the power source, is used under various conditions from the idling operation state to the maximum rotation speed. Therefore, it must be able to handle a wide range of frequencies. For this reason, a so-called liquid-filled engine mount (vibration isolator) in which two liquid chambers are provided inside and are connected by orifices has already been devised. It is publicly known in a gazette or the like.
[0003]
[Problems to be solved by the invention]
By the way, the above-mentioned known one has two orifices in order to cope with two kinds of input vibrations in a low frequency range, and by operating these orifices, two kinds of vibrations, for example, an engine It is designed to be able to cope with the idling vibration and the engine shake (vibration cutoff). However, these vibrations have frequencies of around 10 to 30 Hz. By the way, automobile engines are used in various situations, and the frequency range of vibration and noise propagated into a vehicle interior via the engine and an engine mount supporting the engine is also wide. I have. In particular, recently, in addition to the idling vibration and the engine shake, vibration / noise related to engine noise such as muffled sound, which is a vibration in a higher frequency range than these, has become a problem. In order to cut off vibrations in these relatively high frequency ranges, it is desirable to provide a liquid-filled type vibration damping device capable of forming a low dynamic spring constant even in these high frequency ranges. It is an object (problem) of the present invention.
[0004]
[Means for Solving the Problems]
In order to solve the above problems, the present invention has taken the following measures. In other words, according to the first aspect of the present invention, there is provided a connecting member mounted on the vibrating body, a holder mounted on the vehicle body, and an insulator between the connecting metal member and the holder for absorbing and blocking vibration from the vibrating body. , A liquid chamber provided continuously with the insulator and filled with a liquid that is an incompressible fluidComprisingIn a liquid-sealed vibration isolator comprising: a main chamber in which the chamber wall is formed by a part of an insulator, and a liquid is sealed, A sub-chamber connected to the main chamber via an orifice so that the liquid flows, and a sub-chamber provided in a part of the main chamber via a diaphragm, wherein the volume of the chamber is formed to be variable. And an air chamber which is provided around the sub-chamber through another diaphragm and in which air is always introduced, and the equilibrium chamber having such a configuration. , Either negative pressure or atmospheric pressure, continuously or synchronized with engine vibrationhandSwitching means for performing a switching operation so as to be alternately introduced is provided, and further, control means for controlling the switching operation of the switching means is provided.
[0005]
By adopting the above configuration, the present invention has the following effects. That is, in the present invention, an equilibrium chamber is provided inside the main chamber via a diaphragm, and a negative pressure or an atmospheric pressure is appropriately introduced into the equilibrium chamber. is there. The introduction of the negative pressure or the atmospheric pressure is performed through switching means controlled by the control means. That is, by the operation of the switching means, a negative pressure is periodically introduced into the equilibrium chamber at a specific frequency, or a constant negative pressure is continuously introduced. In some cases, the equilibrium chamber is kept open to the atmosphere. Therefore, for example, with respect to idling vibration of the engine forming the vibrating body, the pressure (volume) of the equilibrium chamber is changed by the ON / OFF operation of the switching means, whereby the pressure is input through the insulator. Fluid pressure fluctuations in the main chamber caused by idling vibrations are absorbed. As a result, the dynamic spring constant of the spring system formed by the insulator and the main vibration isolator is reduced. These are intended to absorb and block idling vibration.
[0006]
On the other hand, with respect to 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. Thus, the chamber volume of the equilibrium chamber changes freely with respect to the high-frequency vibration input through the insulator and the liquid in the liquid chamber. As a result, the insulator and the liquid in the liquid chamber can freely vibrate, and the dynamic spring constant of the spring system formed by the vibration isolating mechanism can be kept low. Therefore, the effect of blocking vibration in a high frequency range is enhanced. As described above, according to the present invention, by providing the switching means including the switching valve and the like, one orifice, and furthermore, one equilibrium chamber, a plurality of kinds of vibrations can be absorbed and cut off. .
[0007]
Further, with respect to an engine shake which is a vibration of a lower frequency than the idling vibration, the liquid is caused to flow in an orifice connecting between the main chamber and the sub-chamber. Shake absorption and blocking are performed. 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 introduced into the equilibrium chamber forming the vibration isolation mechanism, and the volume of the equilibrium chamber is set to zero. Thus, the liquid flows in the orifice formed between the main chamber and the sub-chamber, and a predetermined damping force is generated by viscous resistance accompanying the flow of the liquid. . The damping force is used to reduce the engine shake.
[0008]
Next, the second aspect of the invention will be described. This is also basically the same as the first aspect. The feature is that the vibration isolating mechanism has a cylindrical shape. That is, an inner cylinder that forms a connecting fitting attached to the vibrating body and has a cylindrical shape, an outer cylinder that forms a holder that is attached to the vehicle body side and has a cylindrical shape, An insulator provided between the inner cylinder and the outer cylinder and around the inner cylinder; and a liquid chamber provided around the insulator and filled with a liquid that is an incompressible fluid.ComprisingWith respect to a cylindrical liquid-filled vibration damping device comprising: a main chamber in which a chamber wall is formed by a part of an insulator and a liquid is sealed. A sub-chamber, which is connected to the main chamber via an orifice so that the liquid flows, and has a sub-chamber separated from the main chamber by a rigid partition plate; Part is provided through a diaphragm, the equilibrium chamber is formed so that the volume of the chamber is changed, and outside the sub-chamber, provided through another diaphragm, always air And an air chamber to be introduced, and in the equilibrium chamber having such a configuration, either one of negative pressure or atmospheric pressure is continuously or synchronized with engine vibration.handSwitching means for performing a switching operation so as to be alternately introduced is provided, and further, control means for controlling the switching operation of the switching means is provided. By adopting such a configuration, according to the present invention, it is possible to further reduce the size and weight in addition to the above-described claim 1. In addition, space saving can be achieved when supporting the vibrating body.
[0009]
Next, a third aspect of the present invention will be described. In this apparatus, an anti-vibration mechanism including a liquid chamber or the like is provided in series with an insulator. That is, in the liquid-filled type vibration damping device, the vibration damping mechanism section is composed of a liquid chamber provided in series with the insulator, and a main chamber in which a chamber wall is formed by a part of the insulator. A sub-chamber having a configuration in which the main chamber is connected to the main chamber via an orifice so that the liquid flows, and the main chamber is separated from the main chamber by a rigid partition plate; And an equilibrium chamber formed so that either one of the atmospheric pressure and the negative pressure is introduced between the equilibrium chamber and the sub-chamber. In this configuration, an air chamber, which is provided through another diaphragm in the portion and in which air is constantly introduced, is adopted. By adopting such a configuration, according to the present invention, in addition to the above-described claim 1, the vibration from the vibrating body is directly transmitted to the insulator and the liquid in the main chamber. Thus, the effect of blocking vibration is further enhanced. Further, a vibration isolator having a balancing chamber in the main chamber is formed on the basis of the conventional vertical liquid-filled type vibration isolator, thereby improving the assemblability (assembling property) of the entire vibration isolator. Will be achieved.
[0010]
Next, the invention according to claim 4 will be described. This is also basically the same as the third aspect. The feature is that the diaphragm, which also forms the equilibrium chamber, does not adhere to the partition plate, which forms the equilibrium chamber. That is, in a liquid-filled type vibration damping device including a liquid chamber and the like provided in series with the insulator, a partition plate that forms a part of the equilibrium chamber in the above-described vibration damping mechanism, and the equilibrium chamber is also formed. A configuration having an innumerable uneven portion formed so that air can flow between the surface of the partition plate-side contact surface and the surface of the diaphragm-side contact surface where the diaphragm comes into contact. I decided.
[0011]
By adopting such a configuration, the device according to the present invention exhibits the following operation in addition to the above-described third embodiment. That is, a negative pressure or an atmospheric pressure is introduced into the equilibrium chamber, and when the diaphragm forming a part of the equilibrium chamber vibrates (deforms), the diaphragm is moved toward the partition plate by the negative pressure. When it is sucked and comes into contact with the partition plate, it does not come into close contact with the partition plate. Specifically, on the side of the surface of the partition plate which is in contact with the diaphragm, countless fine irregularities are provided when viewed microscopically. The valleys (grooves) formed between these fine irregularities have an overall continuous form. Therefore, even if the diaphragm is sucked by the negative pressure and comes into contact with the surface of the partition plate having the fine concavo-convex portion having such a configuration, many gaps are formed between the two. The groove formed by these gaps communicates with a space other than where the diaphragm exists. Therefore, the diaphragm does not adhere to or adhere to the surface of the partition plate. As a result, the diaphragm operates (deforms) smoothly in response to the introduction of the negative pressure or the atmospheric pressure from the switching means, and the volume change of the equilibrium chamber formed by the diaphragm is smoothly advanced. Become.
[0012]
Next, the invention according to claim 5 will be described. This is also basically the same as the first aspect. The feature is that the configuration of the vibration isolating mechanism is constituted by one liquid chamber and one equilibrium chamber which also serves as an air chamber. That is, a connecting fitting attached to the vibrating body, a holder attached to the vehicle body, an insulator between the connecting fitting and the holder that absorbs and blocks vibration from the vibrating body, and is provided in series with the insulator. A liquid chamber in which a liquid that is an incompressible fluid is filled, and an air chamber provided below the liquid chamber through a diaphragm.ComprisingWith respect to a liquid-filled type vibration isolator comprising a vibration isolating mechanism, the vibration isolating mechanism is formed with a part of the insulator, the chamber wall of which is formed, and vibration from the insulator is reduced. A liquid chamber having a liquid directly propagated therein and a liquid chamber provided in series with the liquid chamber via a diaphragm, and one of negative pressure and atmospheric pressure is introduced. And an equilibrium chamber also serving as an air chamber, and in the equilibrium chamber having such a configuration, one of negative pressure and atmospheric pressure is synchronized with engine vibration.handSwitching means for performing a switching operation so as to be alternately introduced is provided, and further, control means for controlling the switching operation of the switching means is provided. By adopting such a configuration, in the device of the present invention, with a simple structure, it is possible to cut off idling vibration and cause a problem during traveling, and a frequency of about 100 Hz to 600 Hz which causes a muffled sound. It is possible to cut off vibration in a high frequency range.
According to a sixth aspect of the present invention, there is provided a connecting member attached to the vibrator, a holder attached to the vehicle body, an insulator between the connecting member and the holder for absorbing and blocking vibration from the vibrating member, and the insulator. And a vibration isolator provided with a liquid chamber in which a liquid that is an incompressible fluid is enclosed. Is a part of the insulator, the chamber wall of which is formed, is connected to a main chamber in which liquid is sealed, and the main chamber is connected to the main chamber via an orifice so that the liquid flows. A sub-chamber separated from the chamber by a rigid partition plate, and a sub-chamber provided between the main chamber and the partition plate via a diaphragm, wherein one of atmospheric pressure and negative pressure is provided. One And an equilibrium chamber formed such that the volume of the chamber is changed by being introduced.In the equilibrium chamber having such a configuration, one of negative pressure and atmospheric pressure is provided. Switching means for performing a switching operation so as to be introduced continuously or alternately in synchronization with engine vibration, and further provided with control means for controlling the switching operation of the switching means. It is a liquid filled type vibration damping device.
According to a seventh aspect of the present invention, there is provided a coupling member attached to a vibrating body, wherein an inner cylinder having a cylindrical shape and a holder attached to a vehicle body are formed. An outer cylinder, between the inner cylinder and the outer cylinder, an insulator provided around the inner cylinder, and a liquid which is provided around the insulator and is an incompressible fluid. A cylindrical vibration-absorbing mechanism comprising a liquid chamber having a liquid chamber, wherein the chamber wall is formed by a part of an insulator. A main chamber in which the liquid is sealed, and the main chamber is connected to the main chamber via an orifice so that the liquid flows, and the main chamber is separated from the main chamber by a rigid partition plate. And a part of the main room An equilibrium chamber that is provided via a diaphragm and has a chamber volume that is formed so as to change, and the equilibrium chamber having such a configuration includes a negative pressure or an atmospheric pressure. A switching means for performing a switching operation so that either one of them is introduced continuously or alternately in synchronization with engine vibration is provided, and a control means for controlling the switching operation of the switching means is provided. This is a cylindrical liquid-filled type vibration damping device characterized by the following.
[0013]
BEST MODE FOR CARRYING OUT THE INVENTION
An embodiment of the present invention will be described with reference to FIGS. First, a first embodiment of the present invention will be described. Although it relates to the first embodiment, as shown in FIG. 1, the structure is such that an inner cylinder 77 forming a connection fitting attached to the vibrator and a holder serving as a holder attached to the vehicle body are provided. 9, an insulator 2 provided between the inner cylinder 77 and the outer cylinder 66 and provided around the inner cylinder 77 connected to the vibrating body. A vibration isolator 1 formed around the main chamber 11 and the subchamber 12 in which a liquid that is an incompressible fluid is sealed; A balancing chamber 13 provided in the main chamber 11 for introducing a negative pressure or an atmospheric pressure, and a switching means 3 for switching the negative pressure or the atmospheric pressure introduced into the balancing chamber 13; , Turning off the switching means 3 And control means 5 for controlling the operation, in which a basic that it consists.
[0014]
In such a basic configuration, the insulator 2 is made of an anti-vibration rubber material, and is integrally connected to the inner cylinder 77 by vulcanization bonding means or the like. The vibration isolator 1 including the main chamber 11 and the like is provided around the insulator 2 having such a configuration. As shown in FIG. 1, the vibration isolation mechanism 1 includes a main chamber 11 having a chamber wall formed continuously with the insulator 2 and at a part of the insulator 2. The sub-chamber 12, which is provided on the opposite side and is separated by a ring-shaped partition plate 14, connects the main chamber 11 and the sub-chamber 12 to each other. An orifice 16 provided along the outer chamber 12; an air chamber 18 provided outside the sub-chamber 12 through another diaphragm 17 to which air is constantly introduced; It is basically composed of an equilibrium chamber 13 formed through a diaphragm 15 in a space forming the chamber 11.
[0015]
In such a basic configuration, an orifice 16 is provided between the main chamber 11 and the sub chamber 12 so that the liquid between the main chamber 11 and the sub chamber 12 flows. Is what it is. A stopper 8 made of a rubber-like elastic material is provided in the main chamber 11, and a rigid protector 88 is provided below the stopper 8. Things. The diaphragm 15 forming the equilibrium chamber 13 is protected by the stopper 8 and the protector 88 when a large amplitude vibration is input from the vibrating body. The insulator 2 having such a configuration and the vibration isolating mechanism 1 formed around the insulator 2 are installed in the outer cylinder 66, and the outer cylinder 66 is connected to a member or the like on the vehicle body. It is intended to be attached to.
[0016]
Further, a communication path 19 is provided at the equilibrium chamber 13 forming the vibration isolation mechanism 1 having the above-described configuration, and one end of the communication path 19 is connected to a switching valve 31 forming the switching means 3. It is to be connected. The switching valve 31 is formed of a three-way valve, and is adapted to switch the equilibrium chamber 13 to a negative pressure source or the atmosphere by being appropriately switched. The switching operation of the switching means 3 is performed by a solenoid 32 provided integrally. That is, the switching means 3 is formed by a solenoid valve. A throttle valve 33 for balancing the introduction speed of the atmospheric pressure and the introduction speed of the negative pressure is provided on the side of the atmospheric pressure introduction port of the switching valve 31 having such a configuration.
[0017]
The control means 5 for controlling the switching operation of the switching means 3 comprises a microcomputer (CPU) formed based on a microprocessor unit. The switching means 3 is driven by the control action of the control means 5 having such a configuration, whereby the negative pressure formed by the engine suction negative pressure or the like or the atmospheric pressure formed by opening to the atmosphere is reduced by the equilibrium. It is to be introduced into the chamber 13. The introduction of the negative pressure or the atmospheric pressure through the switching means 3 drives (deforms) the diaphragm 15 forming a part of the equilibrium chamber 13, and causes the liquid generated in the main chamber 11. It is designed to absorb pressure fluctuations.
[0018]
Next, an operation mode and the like of the present embodiment having such a configuration will be described. That is, the vibration from the vibrating body side is transmitted to the insulator 2 made of a rubber material or the like via the inner cylinder 66 as shown in FIG. Thus, the insulator 2 vibrates or deforms, and absorbs or blocks 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 and cut off at the next vibration isolation mechanism 1. It becomes. Next, a specific operation of the vibration isolation mechanism 1 will be described. First, with respect to the idling vibration, by operating the switching means 3, the negative pressure or the atmospheric pressure is specified in the main chamber 11 and the equilibrium chamber 13 provided below the main chamber 11. Are introduced alternately at a frequency of That is, by operating the switching means 3 at a specific frequency, the pressure (volume) in the equilibrium chamber 13 is changed, whereby the main chamber caused by idling vibration input through the insulator 2 is changed. Fluctuations in the hydraulic pressure in 11 are absorbed. As a result, the dynamic spring constant of the spring system formed by the insulator 2 and the main vibration isolator 1 is reduced, and the idling vibration is absorbed and cut off.
[0019]
Next, for an engine shake that is a vibration having a lower frequency than the idling vibration, since the vibration has a low frequency of about 10 Hz, the dynamic spring constant should be reduced. It is difficult to achieve vibration isolation. Therefore, in this embodiment, the vibration related to the engine shake is suppressed (attenuated) by improving the damping characteristics of the vibration isolating mechanism 1. That is, a constant negative pressure is introduced into the equilibrium chamber 13 forming the vibration isolation mechanism 1, and the volume in the equilibrium chamber 13 is set to zero. As a result, the liquid flows in the orifice 16 formed between the main chamber 11 and the sub-chamber 12. Then, a predetermined damping force is generated by viscous resistance accompanying the flow of the liquid. With this damping force, the engine shake is damped.
[0020]
On the other hand, with respect to vibration in a high frequency range of about 100 Hz to 600 Hz which causes a muffled sound which is a problem during running of the vehicle, the switching means 3 is operated to bring the equilibrium chamber 13 into a state of opening to the atmosphere. Hold. As a result, the volume of the equilibrium chamber 13 can be freely changed with respect to the high-frequency vibration input through the insulator 2 and the liquid in the main chamber 11. As a result, the liquid in the insulator 2 and the liquid in the main chamber 11 can freely vibrate, and the dynamic spring constant of the spring system formed by the vibration isolation mechanism 1 can be kept low. Become. Therefore, the effect of blocking vibration in a high frequency range is enhanced.
[0021]
Next, a second embodiment of the present invention will be described with reference to FIGS. Although it relates to the present embodiment, as shown in FIG. 2, the structure is such that the connecting member 7 attached to the vibrator, the holder 6 attached to the vehicle body, and the vibrating member An insulator 2 that absorbs and blocks vibrations from the oscillating device, a vibration isolation mechanism 1 that is provided in series with the insulator 2 and includes a liquid chamber or the like in which a liquid that is an incompressible fluid is filled; A switching means 3 provided in a main chamber 11 forming the vibration isolating mechanism 1 for performing a switching operation so that a negative pressure or an atmospheric pressure is alternately introduced into an equilibrium chamber 13 whose volume changes. And a control means 5 for controlling the switching operation of the switching means 3.
[0022]
In such a basic configuration, the insulator 2 is made of an anti-vibration rubber material, and is integrally connected to the connection fitting 7 by a vulcanization bonding means or the like. The vibration isolator 1 provided in series with the insulator 2 below the insulator 2 having such a configuration includes a main chamber 11 and a sub-chamber 12, as shown in FIGS. A liquid chamber, an air chamber 18 formed through another diaphragm 17 below the sub chamber 12 forming the liquid chamber, and a partition plate 14 for separating the main chamber 11 and the sub chamber 12 from each other. And an equilibrium chamber 13 formed via a diaphragm 15 in a space above the main chamber 11 to form the main chamber 11.
[0023]
In such a basic configuration, an orifice 16 is provided between the main chamber 11 and the sub-chamber 12, as shown in FIGS. The liquid between them flows. The equilibrium chamber 13 is provided with a communication path 19, and one end of the communication path 19 is connected to a switching valve 31 forming the switching means 3. The switching means 3 having the above configuration is the same as that described in the first embodiment. Therefore, the control means 5 for controlling the switching operation of the switching means 3 is also provided in the first embodiment. And a microcomputer (CPU) formed based on the same microprocessor unit as that described in the first embodiment.
[0024]
In this embodiment having such a configuration, the surface structure of the partition plate 14 forming the equilibrium chamber 13 (modification) will be described with reference to FIG. This has a configuration in which fine uneven portions 145 formed so as to allow air to flow are provided at the surface of the partition plate 14. The fine irregularities 145 are formed by a surface treatment such as a shot blasting unit or a surface embossing unit so that the roughness of the surface is roughened. On the contact surface side of the diaphragm 15 which comes into contact with the surface of the partition plate 14, a lubricating layer formed by applying a urethane-based paint or a silicone-based paint is formed. is there.
[0025]
By adopting such a configuration, in the present embodiment, a negative pressure or an atmospheric pressure is introduced into the equilibrium chamber 13, and the diaphragm 15 vibrates and comes into contact with the partition plate 14. When this occurs, the partition plate 14 and the diaphragm 15 do not come into close contact with each other. That is, on the side of the surface of the partition plate 14 which is in contact with the diaphragm 15, microscopically, countless fine irregularities 145 are provided. A continuous groove is formed between the fine irregularities 145. Therefore, even if the diaphragm 15 is brought into contact with the surface of the partition plate 14 having the fine irregularities 145 having such a configuration by suction under a negative pressure, many gaps are formed between the two. It becomes. Since the groove formed by these gaps communicates with a space other than where the diaphragm 15 is present, the diaphragm 15 comes into close contact with or adsorbs to the surface of the partition plate 14. Nothing to do. As a result, the diaphragm 15 operates (deforms) smoothly in response to the introduction of the negative pressure or atmospheric pressure from the switching means 3, and the volume change of the equilibrium chamber 13 formed by the diaphragm 15 also smoothly. Will be advanced.
[0026]
Next, a third embodiment of the present invention will be described with reference to FIG. In this embodiment, the vibration isolator 1 is formed on the basis of one liquid chamber 111 and one equilibrium chamber (also serving as an air chamber) 13, and the structure is simplified. Is what is being done. That is, although the present embodiment relates to the present embodiment, the structure of the vibration isolating mechanism 1 is provided below the insulator 2 as shown in FIG. 5, and the vibration from the insulator 2 is directly propagated. A chamber 111 and an equilibrium chamber 13 which is provided through the liquid chamber 111 and the diaphragm 15 and serves as an air chamber into which one of negative pressure and atmospheric pressure is introduced. It is. A switching means 3 for performing a switching operation such that one of the negative pressure and the atmospheric pressure is periodically introduced into the equilibrium chamber 13 also serving as an air chamber; And control means 5 for controlling the operation. The insulator 2 is provided above the main vibration isolating mechanism 1 having such a configuration, and further, a connecting metal fitting 7 and a holder 6 are provided above and below the insulator 2 so as to hold the vibration isolating mechanism 1 and the insulator 2. With the provision, a simple liquid-filled type vibration damping device is formed. By adopting such a configuration, in this embodiment, the switching operation of the switching means 3 including the solenoid valve causes both the idling vibration and the vibration in a relatively high frequency range which is a problem during traveling. With respect to vibration, a low dynamic spring constant can be formed.
[0027]
【The invention's effect】
According to the present invention, a connection fitting attached to the vibrator, a holder attached to the vehicle body, an insulator between the connection fitting and the holder for absorbing and blocking vibration from the vibrator, and an insulator A vibration isolating mechanism formed by a liquid chamber or the like in which a liquid that is an incompressible fluid is sealed, and introducing a negative pressure or an atmospheric pressure into the vibration isolating mechanism. As described above, with respect to a liquid-filled type vibration damping device comprising switching means for performing switching operation as described above and control means for controlling switching operation of the switching means, the vibration isolating mechanism portion is formed by a part of the insulator in the chamber. A liquid chamber, in which a wall is formed and in which the vibration from the insulator is directly propagated, is provided in the liquid chamber, and the liquid chamber is provided continuously and via the diaphragm. And an equilibrium chamber into which one of the negative pressure and the atmospheric pressure is introduced. Therefore, by turning on / off the switching means, By changing the volume of the equilibrium chamber, it is possible to absorb the fluctuation of the liquid pressure in the liquid chamber caused by the idling vibration input through the insulator, and as a result, to absorb and block the idling vibration Has become possible.
[0028]
On the other hand, with respect to vibration in a high frequency range of about 100 Hz to 600 Hz which causes a muffled sound which is a problem during traveling of the vehicle, the switching means is operated to open the equilibrium chamber to the atmosphere. This allows the equilibrium chamber to freely change its chamber volume with respect to the high-frequency vibration input through the insulator and the liquid in the liquid chamber, thereby forming the vibration-proof mechanism. The dynamic spring constant of the spring system can be kept low. As a result, it is possible to enhance the effect of blocking vibration in a high frequency range.
[0029]
In addition, for the engine shake, an orifice is provided between the main chamber and the sub-chamber forming the liquid chamber, and the liquid flows between the two chambers. A predetermined damping force is generated by the resistance, and the action of the damping force can suppress the engine shake.
[Brief description of the drawings]
FIG. 1 is a cross-sectional view according to a first embodiment of the present invention, showing an overall configuration of a cylindrical liquid-filled type vibration damping device.
FIG. 2 is a vertical cross-sectional view according to a second embodiment of the present invention, showing an entire configuration of a vertical liquid-filled type vibration damping device.
FIG. 3 is a longitudinal sectional view showing an operation mode of the second embodiment of the present invention.
FIG. 4 is a longitudinal sectional view showing an entire configuration of a modification according to the second embodiment of the present invention, in which the structure of the equilibrium chamber is changed.
FIG. 5 is a longitudinal sectional view showing an entire configuration of a third embodiment of the present invention.
[Explanation of symbols]
1 Anti-vibration mechanism
11 Main room
111 liquid chamber
12 Vice room
13 Equilibrium chamber
14 Divider
145 irregularities
15 Diaphragm
16 orifice
17 diaphragm (another diaphragm)
18 air chamber
19 connecting passage
2 insulator
3 Switching means
31 Switching valve
32 solenoid
33 Throttle valve
5 control means
6 holder
66 outer cylinder
7 Connecting bracket
77 inner cylinder
8 Stopper
88 Protector
9 Bracket

Claims (7)

A connection fitting attached to the vibrating body, a holder attached to the vehicle body, an insulator between the connection fitting and the holder for absorbing and blocking vibration from the vibrating body, and provided continuously with the insulator. A vibration-absorbing mechanism comprising a liquid chamber in which a liquid that is an incompressible fluid is enclosed;
The vibration isolation mechanism is connected to a main chamber in which a chamber is formed by a part of an insulator and in which a liquid is sealed, and the liquid flows to the main chamber via an orifice. And a balancing chamber, which is provided through a diaphragm in a part of the main chamber and is formed so that the volume of the chamber changes, and another diaphragm around the sub-chamber. And an air chamber in which air is constantly introduced, and the equilibrium chamber having such a configuration is provided with one of negative pressure and atmospheric pressure, A liquid characterized by providing switching means for performing a switching operation so as to be introduced continuously or alternately in synchronization with engine vibration, and further comprising control means for controlling the switching operation of the switching means. Enclosed Vibration apparatus. An inner cylinder that forms a connection fitting attached to the vibrating body and has a cylindrical shape; an outer cylinder that forms a holder that is mounted on the vehicle body side and has a cylindrical shape; and a between the outer tube, proof consisting comprises an insulator provided around said inner cylinder, the encapsulated by the liquid chamber of the liquid is non-compressible fluid be those provided around of the insulator In a cylindrical liquid-filled vibration isolator comprising a vibration mechanism section,
The vibration isolation mechanism is connected to a main chamber in which a chamber wall is formed by a part of an insulator and in which a liquid is sealed, and the main chamber is connected to the main chamber via an orifice so that the liquid flows. A sub-chamber having a configuration in which the main chamber is separated from the main chamber by a partition plate made of a rigid body, and a sub-chamber provided in a part of the main chamber via a diaphragm, An equilibrium chamber whose volume is changed, and an air chamber which is provided outside of the sub-chamber through another diaphragm and in which air is always introduced, are provided. In the equilibrium chamber having such a configuration, a switching means for performing a switching operation so that either one of the negative pressure or the atmospheric pressure is introduced continuously or alternately in synchronization with engine vibration is provided. , Furthermore, the switch Cylindrical fluid-filled vibration damping device being characterized in that so as to provide a control means for controlling the switching operation of the. 2. The liquid-filled type vibration damping device according to claim 1, wherein the vibration damping mechanism comprises a liquid chamber provided in series with the insulator, and the chamber wall is formed by a part of the insulator. A sub-chamber having a configuration in which the main chamber to be formed is connected to the main chamber via an orifice so that the liquid flows, and the main chamber is separated from the main chamber by a rigid partition plate. And an equilibrium chamber formed between the main chamber and the partition plate through a diaphragm, wherein one of atmospheric pressure and negative pressure is formed to be introduced, A liquid-filled type vibration damping device, comprising: an air chamber provided at a lower portion of the sub-chamber through another diaphragm and into which air is constantly introduced. 4. The liquid-filled type vibration damping device according to claim 3, wherein the partition plate forming a part of the equilibrium chamber, and a surface of the partition plate-side contact surface being in contact with a diaphragm forming the equilibrium chamber. A liquid-filled type vibration damping device, wherein countless uneven portions formed so as to allow air to flow therethrough are provided between the portion and the surface portion of the diaphragm-side contact surface. A connection fitting attached to the vibrator, a holder attached to the vehicle body, an insulator interposed between the connection fitting and the holder for absorbing and blocking vibration from the vibrator, and provided in series with the insulator a is a vibration isolating mechanism ing provided with an air chamber which is provided via the diaphragm to the lower portion of the encapsulated are liquid chamber and the liquid chamber of the liquid is non-compressible fluid, consisting essentially of a liquid-filled In the vibration isolator,
A liquid chamber having therein a vibration-absorbing mechanism portion, in which a chamber wall is formed by a part of the insulator, and a liquid to which vibration from the insulator is directly propagated; And an equilibrium chamber, which is provided in series with the chamber via a diaphragm and which also serves as an air chamber into which one of the negative pressure and the atmospheric pressure is introduced. The equilibrium chamber having such a configuration is provided with switching means for performing a switching operation so that either one of the negative pressure or the atmospheric pressure is alternately introduced in synchronization with the engine vibration, and A liquid-filled type vibration damping device characterized by comprising control means for controlling the switching operation of the means. A connection fitting attached to the vibrating body, a holder attached to the vehicle body, an insulator between the connection fitting and the holder for absorbing and blocking vibration from the vibrating body, and provided continuously with the insulator. And a vibration-proof mechanism comprising a liquid chamber in which a liquid that is an incompressible fluid is filled, and a liquid-filled vibration-proof device comprising:
The vibration isolating mechanism has a chamber wall formed by a part of an insulator, and is connected to a main chamber in which a liquid is sealed, and the main chamber is connected to the main chamber via an orifice so that the liquid flows. A sub-chamber separated from the main chamber by a rigid partition plate, and a diaphragm provided between the main chamber and the partition plate through an atmospheric pressure and a negative pressure. An equilibrium chamber formed such that the chamber volume changes when one of the pressures is introduced,
In the equilibrium chamber having such a configuration, switching means for performing a switching operation such that one of negative pressure and atmospheric pressure is introduced continuously or alternately in synchronization with engine vibration. And a control means for controlling a switching operation of the switching means. An inner cylinder that forms a connection fitting attached to the vibrating body and has a cylindrical shape; an outer cylinder that forms a holder that is mounted on the vehicle body side and has a cylindrical shape; Between the inner cylinder and the outer cylinder, an insulator provided around the inner cylinder, and a liquid chamber provided around the insulator and filled with a liquid that is an incompressible fluid. In a cylindrical liquid-filled vibration isolator comprising a vibration mechanism section,
The vibration isolating mechanism has a chamber wall formed by a part of an insulator, and is connected to a main chamber in which a liquid is sealed, and the main chamber is connected to the main chamber via an orifice so that the liquid flows. A sub-chamber having a configuration in which the main chamber is separated from the main chamber by a partition plate made of a rigid body, and a sub-chamber provided in a part of the main chamber via a diaphragm, An equilibrium chamber formed to have a variable volume,
In the equilibrium chamber having such a configuration, switching means for performing a switching operation such that one of negative pressure and atmospheric pressure is introduced continuously or alternately in synchronization with engine vibration. And a control means for controlling the switching operation of the switching means.

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