JPH10246278A - Vibration isolating device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To control two vibration isolating units, provided in both sides of a vibrator, by a single switching means. SOLUTION: In both sides of a vibrator 4, a liquid-sealed vibration isolating unit 1A, 1B is set up. Of these vibration isolating units 1A, 1b, between a balance chamber of the unit 1A provided in the vicinity side and a switching means 3 is connected by a route 2' formed so as to propagate a pressure change in a condition synchronized with an engine vibration. Between a balance chamber of the unit 1B provided in the distant side and the switching means 3 is connected by a route 2 in a high impedance condition provided with a throttle 21 or the like. The switching means 3 switching so as to introduce a negative pressure or the like to these two vibration isolating units 1A, 1B is provided by a single quantity. A control means 5 controlling switching operation of the switching means 3 is provided. In this way, by a simple constitution, absorption and interruption of idling vibration and engine shake can be attained.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a vibration isolator having a set of liquid-filled vibration damping units on both sides of a vibrating body such as an engine. Negative pressure introduction type liquid filling, in which a simple mechanism can control the switching means which operates to introduce a negative pressure or an atmospheric pressure into each equilibrium chamber forming an appropriate pressure. The present invention relates to a vibration isolator.

[0002]

2. Description of the Related Art Among anti-vibration devices, especially in engine mounts for automobiles, an engine as a power source is used under various conditions from an idling operation state to a maximum rotation speed. Must be able to handle a wide range of frequencies. Therefore, in order to cope with such a plurality of conditions, a liquid chamber is provided inside, and a fluid bag that changes volume at a specific frequency is provided in the liquid chamber, or via a diaphragm or the like. 2. Description of the Related Art A liquid-filled type vibration damping device having a negative pressure chamber (equilibrium chamber) formed in a partitioned manner has been devised, and is already known, for example, from Japanese Patent Publication No. 6-29634.

[0003]

By the way, in the above conventional apparatus, in response to the input of the idling vibration, the fluid bag or the diaphragm or the like is operated so that the hydraulic pressure in the main chamber does not rise, and thereby the idling is performed. This is to reduce the dynamic spring constant of the whole vibration isolator against vibration. On the other hand, for an engine shake which is a problem during running of the vehicle, a negative pressure or the like is continuously introduced into a negative pressure chamber (equilibrium chamber) formed by the fluid bag or the diaphragm. Thus, in response to the vibration input of the engine shake, the liquid in the main chamber is made to flow positively through the orifice to the sub-chamber side. That is, in response to the input of the engine shake, the hydraulic pressure in the main chamber is increased, and the liquid in the main chamber is caused to flow into the orifice, whereby a high damping characteristic is obtained. is there. By the way, in such a system, the above-mentioned liquid-sealed type vibration damping device (vibration isolating unit) is installed in a pair in front and rear or right and left of a vibrating body such as an engine. In each equilibrium chamber that forms a vibration isolator (vibration isolation unit),
The negative pressure or the atmospheric pressure is supplied in an appropriately switched state. Therefore, switching means for switching the introduction of the negative pressure or the atmospheric pressure to the respective equilibrium chambers forming each liquid-filled type vibration isolator (vibration isolation unit) are also provided on each of the left and right sides. As a result, there is a problem that the switching means, the control mechanism, and the like must be large-scale. In order to solve such problems, a set of negative pressure introduction type liquid-filled vibration damping devices (vibration damping units) is mounted on a vibrating body such as an engine, and the operation of each such vibration damping units is performed. It is an object of the present invention to provide a liquid-filled type vibration damping device in which one switching means for controlling the vibration control unit is provided, and the one set of vibration damping units is controlled via the one switching means. Is the purpose (problem).

[0004]

Means for Solving the Problems In order to solve the above problems, the present invention takes the following measures. That is, with respect to the liquid-filled type vibration damping device, an upper connecting member attached to the vibrating body, a 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, a main chamber in which a chamber wall is formed by a part of the insulator, and a main chamber in which liquid is sealed, and a diaphragm connected to the main chamber via an orifice and a diaphragm. , A sub-chamber in which a part of the chamber wall is defined, an air chamber provided for the sub-chamber with the diaphragm interposed therebetween, and an equilibrium formed in the main chamber via another diaphragm. A liquid-filled vibration-isolating unit (vibration isolating unit) is provided on each side of the vibrator. Each of the equilibrium chambers of the two liquid-filled vibration-isolating units (vibration-isolating units) and either one of negative pressure or atmospheric pressure is continuously applied to each of the equilibrium chambers or the vibration of the engine. And one switching means for performing a switching operation so as to be alternately introduced in a state synchronized with the above, and one of the above-mentioned equilibrium chambers is connected to one of the equilibrium chambers in a state (frequency) synchronized with the engine vibration. The pressure fluctuation from the switching means is not propagated to the other one at a frequency equal to or higher than the frequency synchronized with the engine vibration to the other one in a path formed so that the pressure fluctuation is propagated. The connection is made by the path formed as described above, and further, a control means for controlling the switching operation of the switching means formed as described above is provided.

[0005] By adopting such a configuration, the present invention has the following effects.
That is, with respect to idling vibration, by operating the switching means, a negative pressure or an atmospheric pressure is alternately introduced into the liquid-filled type vibration-isolating unit (vibration isolating unit) at a specific frequency. By such an operation, a negative pressure or an atmospheric pressure is alternately introduced at a specific frequency into the equilibrium chamber of one of the liquid filled type vibration damping units (vibration damping units) provided near the switching means. Will be done. As a result, the pressure (volume) in the equilibrium chamber changes, thereby absorbing a fluctuation in the hydraulic pressure in the main chamber caused by idling vibration input through the insulator. Due to this hydraulic pressure absorbing action, the dynamic spring constant of the spring system formed by the vibration isolating unit on the near side decreases.

On the other hand, at this time, a pressure fluctuation from the switching means in a state (frequency) synchronized with the engine vibration is not transmitted to the equilibrium chamber of the other vibration isolating unit provided on the remote side. The negative pressure and the atmospheric pressure introduced through the switching means are not switched as in the case of the near side, and the negative pressure and the atmospheric pressure are not switched. And the average. That is, as shown in FIG. 3, an almost constant state (atmospheric pressure) slightly lower than the atmospheric pressure is introduced. As a result, the equilibrium chamber on the remote side is maintained in a state close to the open-to-atmosphere state, and the diaphragm forming the equilibrium chamber is placed in a state where it is easily vibrated. In such a state, when the idling vibration is propagated into the main chamber forming the vibration isolating unit, the liquid in the main chamber receives a hydraulic pressure fluctuation, and the hydraulic pressure fluctuation (change) is caused by the above-described liquid pressure fluctuation (change). Propagated to the diaphragm forming the equilibrium chamber. Then, at this time, since the diaphragm is in a state where it is easy to vibrate freely, the diaphragm vibrates freely and operates so as to absorb the fluctuation (change) of the hydraulic pressure in the main chamber.
As a result, in response to the input of the idling vibration, the hydraulic pressure in the main chamber does not increase, and the dynamic spring constant formed by the entire vibration isolating unit does not increase. That is, the dynamic spring constant is reduced, and idling vibration is cut off even in the remote-side vibration isolation unit.

[0007] Next, with respect to an engine shake which is a vibration of 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. Thus, absorption and cutoff of the engine shake are achieved. That is, in the present invention, first, the switching means is operated so that the negative pressure is continuously supplied to each of the equilibrium chambers forming the one set of vibration isolation units. That is, the switching means is operated so that the negative pressure is introduced into the two equilibrium chambers. In this case, since the negative pressure is continuously supplied through each path, the negative pressure is introduced into the equilibrium chambers on both the near side and the remote side in the same manner, and each of the equilibrium chambers has a volume. It will be kept at zero state. As a result, in each anti-vibration unit, the liquid flows through the orifice formed between the main chamber and the sub-chamber, and a predetermined resistance is caused by viscous resistance accompanying the flow of the liquid. A damping force will be generated. Then, the engine shake is attenuated (suppressed) by the damping force (high damping characteristic). As described above, according to the present invention, by operating one switching means, idling vibration and engine shake can be efficiently absorbed and cut off.

[0008]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described with reference to FIGS. Although it relates to the embodiment of the present invention, as shown in FIG. 1, the structure thereof is a liquid-filled type vibration damping unit ( Anti-vibration units) 1A and 1B, and a set of these anti-vibration units 1A,
1B, one switching means 3 for performing a switching operation to supply a negative pressure or an atmospheric pressure continuously or alternately in a state synchronized with engine idling vibration;
The negative pressure or the atmospheric pressure appropriately switched by the switching means 3 is supplied to each of the anti-vibration units 1A and 1B. And control means 5 for controlling.

In such a basic configuration, the switching means 3 comprises, as shown in FIGS. 2 and 3, a switching valve 31 comprising a three-way valve or the like, and a solenoid 32 for driving the switching valve 31. is there. A throttle valve 33 for adjusting 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. I have. Further, a resonance tank 35 having a predetermined capacity is provided on the negative pressure introducing side. By providing such a resonance tank 35, when the distance (pipe distance) from the negative pressure source formed by the engine suction negative pressure or the like to the equilibrium chamber 13 becomes long, the resistance in the pipe or the like is increased. This prevents the negative pressure from being reduced. That is, by providing such a resonance tank 35, a predetermined amount of negative pressure is always supplied accurately into the equilibrium chamber 13 with a predetermined cycle.
3 can be vibrated with a large amplitude value.

As shown in FIGS. 1 and 4, the paths 2, 2 'connecting the switching means 3 and the vibration isolating units 1A, 1B installed on the vibrating body 4 are hoses or the like. (2 ') connecting the anti-vibration unit 1A in the vicinity of the switching means 3 and (2') connecting the anti-vibration unit 1B provided on the remote side. ) Has a different configuration.
That is, the unit connected to the vibration isolating unit 1A on the near side has a large diameter, and the pressure fluctuation in a state (frequency) synchronized with the engine vibration from the switching means 3 is normally propagated. Is what it is. On the other hand, the unit connected to the remote image stabilizing unit 1B has a throttle 21 in a part as shown in FIG. 1 or has a predetermined volume in the middle as shown in FIG. An expansion chamber 22 is provided. That is, the path 2 connected to the remote-side vibration isolation unit 1B has a high impedance. As a result, the negative pressure and the like are introduced into the equilibrium chamber 13 of the vibration isolation unit 1B located on the remote side in a state where the negative pressure and the like are leveled (averaged).

[0011] Further, the path 2 having such a configuration,
The control means 5 for controlling the switching operation of the switching means 3 for sending out a predetermined negative pressure or the like to 2 ′ in an appropriately switched state includes:
The microcomputer comprises a microcomputer or the like formed on the basis of arithmetic means such as a microprocessor unit (MPU), detects vibration from a vibrating body such as an engine, and switches the switching means 3 according to the vibration. Is to be controlled.

Next, the switching means 3 having such a configuration is described.
The vibration isolating units 1A and 1B that support a vibrating body 4 such as the engine and the like while a predetermined negative pressure or the like is introduced through the passages 2 and 2 ′ and the like are provided with a liquid-sealing type vibration preventing device as shown in FIG. It is composed of a vibration device (liquid-filled vibration-proof unit) 1. Then, as shown in FIG. 1, the liquid-filled type vibration damping units (vibration damping units) 1 are mounted on both sides of a vibrating body 4 such as an engine, one by one, in pairs.
The present vibration isolator is formed.
The specific configuration of such an anti-vibration unit 1 will be described below. That is, the anti-vibration unit 1
As shown in FIG. 2, an upper connecting member 9 attached to the vibrating body 4 side, a lower connecting member 99 attached to the vehicle body side, and the upper connecting member 9 and the lower connecting member 99 An insulator 7 that absorbs and blocks vibration, a main chamber 11 that is provided in series with the insulator 7 and is filled with a liquid that is an incompressible fluid, and an orifice 16 provided in the main chamber 11 through an orifice 16 The sub-chamber 12 is connected to the sub-chamber 12 and a part of the chamber wall is defined by the diaphragm 17, the air chamber 18 provided with the diaphragm 17 separated from the sub-chamber 12, and the main chamber 11. And an equilibrium chamber 13 formed separately through another diaphragm 15.

In such a basic configuration, the insulator 7 is made of a vibration-proof rubber material.
The upper connecting member 9 is integrally connected to the upper connecting member 9 by vulcanization bonding means or the like. A main chamber 11 in which a chamber wall is formed as a part of the insulator 7 is provided below the insulator 7 having such a configuration. Further, an equilibrium chamber 13 in which a negative pressure or an atmospheric pressure is alternately introduced in a predetermined cycle is provided in a lower portion of the main chamber 11 or the like.

Next, an operation mode and the like of the embodiment having the above-described configuration will be described. First, the vibration from the vibrating body 4 is transmitted to the insulator 7 made of a rubber material or the like via the upper connecting member 9 as shown in FIG. Most of the vibration transmitted to the insulator 7 is absorbed or cut off by deformation of the insulator 7 or the like. However, some of the components are not cut off at the insulator 7 but are cut off at the next vibration mechanism including the equilibrium chamber 13 and the like. The specific operation and the like will be described below. That is, in response to idling vibration, the switching means 3 is operated so that a negative pressure or an atmospheric pressure is alternately introduced into the liquid-filled vibration-proof unit (vibration-proof unit) 1 at a specific frequency. To By such an operation, a liquid-filled type vibration-proof unit (vibration-proof unit) 1A provided near the switching means 3
A negative pressure or an atmospheric pressure is alternately introduced at a specific frequency into the equilibrium chamber 13 (see FIG. 3). As a result, the pressure (volume) in the equilibrium chamber 13 changes, and the fluid pressure fluctuation in the main chamber 11 caused by the idling vibration input through the insulator 7 is absorbed. As a result, the dynamic spring constant of the spring system formed by the vibration isolation unit 1A on the near side decreases.

On the other hand, at this time, the equilibrium chamber 13 is connected to the equilibrium chamber 13 of the anti-vibration unit 1B provided on the remote side via the path 2 in a high impedance state. The negative pressure and the atmospheric pressure introduced via the switching means 3 are not switched as in the above-mentioned near side (1A), but are in a substantially averaged state as shown in FIG. As a result, the equilibrium chamber 13 on the remote side is maintained at a constant negative pressure close to the atmospheric pressure, and the diaphragm 15 forming the equilibrium chamber 13 is placed in a state where it is easily vibrated. In such a state, when the idling vibration is propagated into the main chamber 11 forming the main vibration isolation unit 1B, the liquid in the main chamber 11 undergoes a hydraulic pressure fluctuation. , The equilibrium chamber 13
To the diaphragm 15 which forms
By the way, at this time, since the diaphragm 15 easily vibrates freely, the diaphragm 15 vibrates freely in response to the input of the idling vibration, and absorbs the fluid pressure fluctuation (change) in the main chamber 11. Activate As a result, the hydraulic pressure in the main chamber 11 does not increase in response to the input of the idling vibration, and the dynamic spring constant formed by the entire vibration isolation unit 1B does not increase. That is, the dynamic spring constant is reduced, and idling vibration is cut off also in the remote-side vibration isolation unit 1B.

Next, with respect to the engine shake, which is a vibration having a lower frequency than the idling vibration, the main chamber 11 and the sub-chamber 12 of each of the vibration isolation units 1A and 1B are connected. Inside the orifice 16
The liquid is allowed to flow, thereby absorbing and blocking the engine shake. That is,
In the present embodiment, the switching means 3 is operated,
Negative pressure is continuously supplied to each of the equilibrium chambers 13 forming the pair of vibration isolation units 1A and 1B (see FIG. 3). That is, the switching means 3 is operated so that the negative pressure is introduced into the two equilibrium chambers 13. In this case, since the negative pressure is continuously supplied through each of the paths 2, 2 ', the vibration damping units 1 on both the near side and the remote side are provided.
The same negative pressure is introduced into each of the equilibrium chambers A and 1B, and each of the equilibrium chambers 13 is maintained in a state of zero volume. As a result, each anti-vibration unit 1A, 1B
In the above, the liquid flows through the respective orifices 16 formed between the main chamber 11 and the sub-chamber 12, and a predetermined damping force is generated by viscous resistance accompanying the flow of the liquid. Will occur. Then, the engine shake is attenuated (suppressed) by the damping force (high damping characteristic).

[0017]

According to the present invention, with respect to a vibration isolator for supporting a vibrating body such as an engine, a liquid-filled type vibration isolating unit is provided on both sides of the vibrating body in a pair state, and the two vibration isolating units are combined. One switching means that operates to introduce a negative pressure or an atmospheric pressure into each of the equilibrium chambers to be formed is provided, and control means for controlling the switching operation of the switching means is provided. The vibration isolating unit side reduces the dynamic spring constant of the entire vibration isolating unit by vibrating the diaphragm forming the equilibrium chamber in a state synchronized with the idling vibration. Reduces the dynamic spring constant by freely vibrating the diaphragm that forms the equilibrium chamber, thereby making it possible to cut off idling vibration. .

In addition, for engine shake which is a problem during running of the vehicle, a negative pressure is continuously supplied to the respective equilibrium chambers of the both anti-vibration units, so that the orifices in the two anti-vibration units are supplied. This facilitates the flow of the liquid, thereby exhibiting high damping characteristics. As a result, it becomes possible to attenuate (suppress) the engine shake by the action of the high attenuation characteristic.

As described above, according to the present invention, a negative pressure or the like is introduced into each of the vibration isolating units provided on both sides of the vibrating body through one switching means. Equipment (ACM)
It can be formed with a relatively simple configuration.

[Brief description of the drawings]

FIG. 1 is a perspective view showing the overall configuration of the present invention.

FIG. 2 is a longitudinal sectional view showing the overall configuration of a liquid-filled type vibration damping unit constituting a main part of the present invention.

FIG. 3 is a diagram (graph) showing an operation state of the liquid-filled type vibration damping unit according to the present invention.

FIG. 4 is a view showing a modified example of a path constituting a main part of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Liquid-filled vibration-proof unit (vibration-proof unit) 1A Near-side vibration-proof unit 1B Remote-side vibration-proof unit 11 Main room 12 Sub-chamber 13 Equilibrium room 14 Partition plate 15 Diaphragm 16 Orifice 17 Diaphragm 18 Air chamber 2 Airway (Remote side) 2 'path (near side) 21 throttle 22 expansion chamber 3 switching means 31 switching valve 32 solenoid 33 throttle valve 35 resonance tank 4 vibrating body 5 control means 7 insulator 9 upper connecting member 99 lower connecting member

Claims (1)

[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 a main chamber in which a chamber wall is formed by a part of the insulator and in which a liquid is sealed. The main chamber is connected to the main chamber via an orifice and is connected to the main chamber by a diaphragm. A liquid comprising: a sub-chamber in which a section is formed, an air chamber provided with the diaphragm interposed between the sub-chamber, and an equilibrium chamber formed and formed through another diaphragm with respect to the main chamber. Based on the enclosed vibration isolation unit,
One of the liquid-filled vibration isolation units is provided on each side of the vibrator, and each of the two liquid-filled vibration isolation units has a negative pressure or an atmospheric pressure. One of them continuously,
Alternatively, one switching means for performing a switching operation so as to be alternately introduced in a state synchronized with the engine vibration is connected, and one of the equilibrium chambers is connected to the one synchronized with the engine vibration (frequency ) Are connected by a path formed so that the pressure fluctuations are propagated. On the other hand, the pressure fluctuations from the switching means are transmitted to the other at a frequency higher than the frequency synchronized with the engine vibration. A vibration control device for controlling the switching operation of the switching means having such a configuration.