JP3564592B2 - Anti-vibration device - Google Patents

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a vibration damping device having a set of liquid-filled vibration damping units on both sides of a vibrating body such as an engine, and in particular, each of the equilibrium chambers forming the above set of liquid-filled vibration damping units. The present invention relates to a negative pressure introduction type liquid-filled type vibration damping device that can control a switching unit that operates so as to introduce a negative pressure or an atmospheric pressure in an appropriately switched state by a simple mechanism. is there.
[0002]
[Prior art]
Among the vibration isolators, especially in the case of an engine mount for an automobile, the engine as a power source is used under various conditions from an idling operation state to a maximum rotation speed. Therefore, it 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. 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]
[Problems to be solved by the invention]
By the way, in the conventional apparatus, when the idling vibration is input, the fluid bag or the diaphragm or the like is operated so that the liquid pressure in the main chamber does not rise. The constant is reduced. On the other hand, with respect to 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. Thereby, 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 filled type vibration damping device (vibration isolating unit) is installed in a pair state before and after, or left and right of a vibrating body such as an engine, and each of these liquid filled type vibration damping units is installed. Negative pressure or atmospheric pressure is supplied to each equilibrium chamber forming a vibration isolator (vibration isolating unit) in an appropriately switched state. Accordingly, 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 and the control mechanism must be large-scale. In order to solve such a problem, a set of a negative pressure introduction type liquid-filled vibration isolator (vibration isolating unit) is mounted on a vibrating body such as an engine and the operation of each such vibration isolating unit. It is an object of the present invention to provide a liquid-filled type vibration damping device that is provided with one switching means for controlling the vibration control unit and controls each of the above set of vibration damping units via this one switching means. Is the purpose (problem).
[0004]
[Means for Solving the Problems]
In order to solve the above problems, the present invention has taken the following measures. That is, for a liquid-filled anti-vibration device, and the upper connecting member attached to the vibrating body, and a lower connecting member attached to the vehicle body, the vibrations from the vibrator be in between these upper connection member and the lower connecting member An insulator for absorbing and blocking, a main chamber in which a chamber wall is formed by a part of the insulator, and a main chamber in which a liquid is sealed; and a chamber connected to the main chamber via an orifice and having a diaphragm. Based on a liquid-enclosed vibration-isolating unit (vibration-isolating unit) composed of a sub-chamber in which a part of the wall is defined and an equilibrium chamber defined in the main chamber via another diaphragm, One such liquid-filled vibration-isolating unit (vibration isolating unit) is provided on each side of the vibrator, and each of the two liquid-filled vibration-isolating units (vibration isolating units) Chamber and, together with the coupling and one of the switching means for a switching operation so as to introduce the ones of one or negative pressure or atmospheric pressure caries lichen deviation to the respective equilibrium chamber, controls the switching operation of the switching means Then, a state in which one of the negative pressure and the atmospheric pressure is continuously introduced into the equilibrium chamber, and a state in which the negative pressure and the atmospheric pressure are alternately introduced into the equilibrium chamber in a state synchronized with the engine vibration. acceptable to provide a control means for switching, further, to that of one of the above equilibrium chamber, said switching means in the formed path such that the pressure fluctuations in the synchronized state to the engine vibration is propagated On the other hand, the other is connected to the switching means through a path formed so that the pressure fluctuation from the switching means is not transmitted at a frequency higher than the frequency synchronized with the engine vibration. like And it was decided to adopt a configuration.
In the above configuration, when the switching means is operated so as to alternately introduce a negative pressure and an atmospheric pressure into the equilibrium chamber in synchronization with engine vibration, the one vibration isolating unit forms the equilibrium chamber. It is preferable that the diaphragm be vibrated in synchronization with the vibration, and that the diaphragm forming the equilibrium chamber be freely vibrated in the other vibration isolating unit. In addition, it is preferable that the one vibration isolation unit is a vibration isolation unit provided near the switching unit, and the other vibration isolation unit is a vibration isolation unit provided on a remote side of the switching unit. .
[0005]
By adopting such a configuration, the device of the present invention exhibits the following operation. 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 damping unit (vibration damping unit) at a specific frequency. With 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 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 via 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.
[0006]
On the other hand, at this time, a path formed so that 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 isolation unit provided on the remote side. The negative pressure and the atmospheric pressure introduced via the switching means are not switched as in the case of the near side, but are averaged between the negative pressure and the atmospheric pressure. It becomes a thing. 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 undergoes a hydraulic pressure fluctuation. 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 isolation unit does not increase. That is, the dynamic spring constant is reduced, and the idling vibration is also cut off in the remote-side vibration isolation unit.
[0007]
Next, with respect to the 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, whereby the engine Try to absorb and block the shake. 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 similarly introduced into the equilibrium chambers on both the near side and the remote side, 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 in 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 unit, the idling vibration and the engine shake can be efficiently absorbed and cut off.
[0008]
BEST MODE FOR CARRYING OUT THE INVENTION
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 configuration is a liquid-filled type vibration damping unit ( The anti-vibration units 1A and 1B and the pair of anti-vibration units 1A and 1B are switched so that negative pressure or atmospheric pressure is supplied continuously or alternately in synchronization with engine idling vibration. One switching means 3 for operating, and a negative pressure or an atmospheric pressure appropriately switched by the switching means 3 to each of the vibration isolation units 1A and 1B, and a path 2, 2 'comprising a hose or the like. And a control means 5 for controlling the switching operation of the switching means 3.
[0009]
In such a basic configuration, the switching means 3 includes, as shown in FIGS. 2 and 3, a switching valve 31 composed of a three-way valve or the like, and a solenoid 32 for driving the switching valve 31. A throttle valve 33 for adjusting the introduction speed of the atmospheric pressure to 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. A resonance tank 35 having a predetermined capacity is provided on the negative pressure introduction 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 or the like in the pipe is increased. This prevents the negative pressure from dropping. 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. The diaphragm 15 to be formed can be vibrated with a large amplitude value.
[0010]
As shown in FIGS. 1 and 4, the paths 2, 2 'connecting between the switching means 3 and the respective vibration isolating units 1A, 1B installed on the vibrating body 4 are pipes such as hoses. (2 ') connecting between the vibration isolating unit 1A on the side near the switching means 3 and (2) connecting between the vibration isolating unit 1B provided on the remote side. , Its configuration is different. 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 one 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 anti-vibration unit 1B on the remote side in a state where the negative pressure and the like are leveled (averaged).
[0011]
Further, 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 the paths 2, 2 'having such a configuration while appropriately switching the switching means includes a microprocessor unit (MPU) or the like. And a microcomputer formed on the basis of the arithmetic means described above, detects vibration from a vibrating body such as an engine, and controls the switching operation of the switching means 3 according to the vibration. Is what it is.
[0012]
Next, a predetermined negative pressure or the like is introduced via the switching means 3 and the paths 2 and 2 'etc. having such a configuration, and the vibration isolating units 1A and 1B supporting the vibrating body 4 such as the engine are provided. , A liquid-sealed type vibration-isolating device (liquid-sealed type vibration-isolating unit) 1 as shown in FIG. 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 a pair. It is to be formed. The specific configuration of such an anti-vibration unit 1 will be described below. That is, as shown in FIG. 2, the anti-vibration unit 1 includes an upper connecting member 9 attached to the vibrating body 4, a lower connecting member 99 attached to the vehicle body, and an upper connecting member 9 and a lower connecting member 99. An insulator 7 interposed between the insulator 7 for absorbing and blocking the vibration from the vibrating body 4, a main chamber 11 provided in series with the insulator 7, and filled with a liquid that is an incompressible fluid; A sub-chamber 12 connected to the main chamber 11 via an orifice 16 and a part of a chamber wall is defined by a diaphragm 17; and an air chamber provided with the diaphragm 17 separated from the sub-chamber 12 18 and an equilibrium chamber 13 which is formed separately from the main chamber 11 via another diaphragm 15.
[0013]
In such a basic configuration, the insulator 7 is made of a vibration-proof rubber material, and is integrally connected to the upper connecting member 9 by a 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.
[0014]
Next, an operation mode and the like of the present embodiment having such a configuration will be described. First, as shown in FIG. 2, the vibration from the vibrating body 4 is propagated through the upper connecting member 9 to the insulator 7 made of a rubber material or the like. 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 a vibrating mechanism section including the next equilibrium chamber 13 and the like. The specific operation and the like will be described below. In other words, with respect to idling vibration, by operating the switching means 3, a negative pressure or an atmospheric pressure is alternately introduced into the liquid filled type vibration damping unit (vibration damping unit) 1 at a specific frequency. To By such an operation, the negative pressure or the atmospheric pressure is alternately applied at a specific frequency to the equilibrium chamber 13 of the liquid-filled anti-vibration unit (anti-vibration unit) 1 </ b> A provided near the switching means 3. Will be introduced (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 near-side vibration isolation unit 1A is reduced.
[0015]
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 through are not switched as in the case of the vicinity side (1A), but are substantially averaged 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 isolating unit 1B, the liquid in the main chamber 11 receives a fluctuation in the hydraulic pressure. , To the diaphragm 15 forming the equilibrium chamber 13. 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. To work. 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 the idling vibration is cut off also in the remote-side vibration isolation unit 1B.
[0016]
Next, with respect to the engine shake which is a vibration having a lower frequency than the idling vibration, each of the orifices 16 connecting the main chamber 11 and the sub-chamber 12 of each of the anti-vibration units 1A and 1B. The liquid is caused to flow through the inside, thereby absorbing and blocking the engine shake. That is, in the present embodiment, the switching means 3 is operated so that the negative pressure is continuously supplied to each of the equilibrium chambers 13 forming the pair of vibration isolation units 1A and 1B (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 and 2 ′, the equilibrium chamber 13 of each of the vibration isolation units 1A and 1B on both the near side and the remote side has the same pressure. Is introduced, and each of the equilibrium chambers 13 is kept in a state of zero volume. As a result, in each of the anti-vibration units 1A and 1B, the liquid flows through the orifices 16 formed between the main chamber 11 and the sub-chamber 12, and the liquid flows along with the flow of the liquid. Due to the viscous resistance, a predetermined damping force is generated. Then, the engine shake is attenuated (suppressed) by the damping force (high damping characteristic).
[0017]
【The invention's effect】
According to the present invention, with respect to a vibration isolator supporting a vibrating body such as an engine, liquid-filled vibration isolating units are provided in a pair on both sides of the vibrating body, and respective balances forming the two vibration isolating units are provided. Since one switching means that operates to introduce a negative pressure or an atmospheric pressure into the chamber is provided, and a control means that controls the switching operation of the switching means is provided, one of the vibration isolation units is provided. Reduces the dynamic spring constant of the whole anti-vibration unit by vibrating the diaphragm forming the equilibrium chamber in synchronization with the idling vibration. By freely vibrating the diaphragm to be formed, the dynamic spring constant can be reduced, so that idling vibration can be cut off.
[0018]
In addition, in the case of engine shake, which is a problem during running of the vehicle, negative pressure is continuously supplied to the respective equilibrium chambers of both anti-vibration units, so that the liquid in the orifices in both anti-vibration units is The flow is promoted, and thereby high damping characteristics can be exhibited. As a result, it becomes possible to attenuate (suppress) the engine shake by the action of the high attenuation characteristic.
[0019]
As described above, in the apparatus according to the present invention, since the negative pressure and the like are introduced into each of the vibration isolating units provided on both sides of the vibrating body via one switching means, the active control mounting device (ACM) ) 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 an entire configuration of a liquid-filled type vibration damping unit which is 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]
1 Liquid-filled vibration-proof unit (vibration-proof unit)
1A Near-side anti-vibration unit 1B Remote-side anti-vibration unit 11 Main room 12 Sub-room 13 Balancing room 14 Partition plate 15 Diaphragm 16 Orifice 17 Diaphragm 18 Air chamber 2 Path (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 (3)

An upper connecting member attached to the vibrating body, a lower connecting member attached to the vehicle body , an insulator interposed between the upper connecting member and the lower connecting member for absorbing and blocking vibration from the vibrating body, and one of the insulators A main chamber in which a chamber wall is formed and a liquid is sealed, and a sub-chamber connected to the main chamber via an orifice and partly formed by a diaphragm by a diaphragm When the equilibrium chamber which are partitioned and formed through another diaphragm with respect to the upper Symbol main chamber, the fluid-filled vibration isolating unit comprising the foundation, one each the fluid-filled vibration isolating units on both sides of the vibrating body each provided, each of the equilibrium chamber, switching those of one or the negative pressure or atmospheric pressure caries lichen shift to each of the equilibrium chamber so that introduction of such two liquid-filled vibration damping unit With connecting the one of the switching means for the operation, and controls the switching operation of said switching means, and a state continuously introducing one of a negative pressure and the atmospheric pressure in the equilibrium chamber, above the equilibrium chamber Control means for switching between a state in which the negative pressure and the atmospheric pressure are alternately introduced in a state synchronized with the engine vibration is provided, and one of the equilibrium chambers is provided with a state synchronized with the engine vibration. And the other means is connected to the switching means via a path formed so that the pressure fluctuation in the state is propagated. anti-vibration device comprising a kite as the pressure fluctuation is connected to the switching means in the formed path so as not to propagate from. When the switching means is operated so as to alternately introduce a negative pressure and an atmospheric pressure into the equilibrium chamber in synchronization with engine vibration, the diaphragm forming the equilibrium chamber in the one vibration isolating unit is affected by the vibration. 2. The vibration damping device according to claim 1, wherein vibrations are applied in a synchronized state, and in the other vibration damping unit, a diaphragm forming the equilibrium chamber freely vibrates. The one vibration isolation unit is a vibration isolation unit provided near the switching unit, and the other vibration isolation unit is a vibration isolation unit provided on the remote side of the switching unit. An anti-vibration device according to claim 1.

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