JP3134799B2 - Liquid filled type vibration damping device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a liquid-filled type vibration damping device capable of obtaining a vibration damping effect based on the flow of a fluid (liquid) sealed therein.
The present invention relates to a liquid-filled type vibration damping device in which the vibration damping characteristics exhibited by the flow of the liquid can be switched to a plurality of stages by using a vibration device having a simple structure driven by the engine suction negative pressure. Things.

[0002]

2. Description of the Related Art Among anti-vibration devices, particularly in engine mounts for automobiles and the like, an engine as a power source is operated under various conditions from an idling operation state to a maximum rotation speed. Since it is used, it must be able to handle a wide range of frequencies. Recently, engine mounts have been tuned for the purpose of cutting off noise caused by vibration in a relatively high frequency range. In order to cope with such a plurality of conditions, a so-called voice coil type in which a liquid chamber is provided inside, and a vibrator made of a voice coil or the like vibrating at a specific frequency is further provided in the liquid chamber. The liquid-filled type vibration damping device has already been devised, and is known, for example, from Japanese Patent Application Laid-Open No. 5-149369. However, in these known devices, a plurality of liquid chambers are provided, a movable piece such as a piston is provided in the liquid chamber, and a voice coil for driving the movable piece is provided. Its structure is complicated. Therefore, these known devices have a problem that they have to be heavier as a whole as a vibration isolator because they have many components including a vibrating coil and a permanent magnet. In order to solve such a problem, a vibration device including a simple mechanism driven by the negative pressure of the engine is provided to cut off various vibrations such as idling vibration. An application has already been filed by the present applicant as shown in FIG. 2 (see Japanese Patent Application No. 8-287524).

[0003]

In the above-mentioned conventional apparatus, the vibration isolating mechanism 10 is provided with an insulator 20,
And a balancing chamber 130 provided in the main chamber 110 with a diaphragm 150 interposed therebetween. And, into the equilibrium chamber 130,
The switching means 30 that performs the switching operation based on the control action of the control means 50 introduces the engine suction negative pressure or the atmospheric pressure. In particular, when shutting off vibration at the time of engine idling, the switching valve 310 forming the switching means 30 is opened and closed in accordance with the frequency at the time of engine idling, whereby the engine suction negative pressure and the atmospheric pressure are reduced. Equilibrium chamber 1
30 are alternately introduced. By the way, when the switching valve 310 is opened and closed at a predetermined cycle (frequency) during the introduction of the negative pressure and the atmospheric pressure, the pressure fluctuation in the equilibrium chamber 130 at that time, that is, the excitation force The fluctuating state may include high frequency component noise. Then, the noise of the high-frequency component propagates a complicated high-frequency vibration sound into the vehicle compartment instead of the idling vibration. In order to solve such a problem, a liquid-filled type vibration damping device is provided in which the pressure fluctuation in the equilibrium chamber is a sine wave having no high-frequency component when introducing a negative pressure and an atmospheric pressure. What is to be attempted is the object (problem) of the present invention.

[0004]

Means for Solving the Problems In order to solve the above problems, the present invention takes the following measures. That is, according to the first aspect of the present invention, the upper connecting member attached to the vibrating body, the lower connecting member attached to a member or the like on the vehicle body, and the upper connecting member and the lower connecting member interposed between the upper connecting member and the lower connecting member. An insulator that absorbs and blocks the vibration of the main body, a main chamber in which a chamber wall is formed by a part of the insulator, and a liquid is sealed therein, and a first orifice (first orifice) in the main chamber. And a first diaphragm (first diaphragm) as a part of the chamber wall and a main chamber through a second orifice (second orifice). A third liquid chamber (third liquid chamber) formed so that the liquid in the main chamber is introduced,
The third liquid chamber is partitioned by a second diaphragm (second diaphragm), and is formed such that one of atmospheric pressure and negative pressure is introduced. And a state in which either one of negative pressure or atmospheric pressure is continuously or synchronized with engine vibration. A switching means for performing a switching operation so as to be alternately introduced is provided, and a control means for controlling the switching operation of the switching means 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, negative pressure or atmospheric pressure is alternately introduced into the equilibrium chamber at a specific frequency. That is, by operating the switching means at a specific frequency, the pressure (volume) in the equilibrium chamber is changed, whereby the hydraulic pressure fluctuation in the main chamber caused by idling vibration input through the insulator. So that it absorbs. As a result, the dynamic spring constant of the spring system formed by the insulator and the vibration isolating mechanism is reduced. In particular, in this case, in the case of the present invention, the third liquid chamber, which receives a pressure fluctuation by the operation of the second diaphragm, and the main chamber are connected by a second orifice having a predetermined volume. The liquid in the second orifice resonates with the liquid pressure fluctuation of the liquid in the main chamber by the operation of the equilibrium chamber, that is, the operation of the second diaphragm. Therefore, the change state of the generated force (vibration energy) formed in the entire vibration isolation mechanism is a sine wave state that does not include high frequency component noise or the like. Thus, the absorption and cutoff of the idling vibration are accurately performed. In addition, it is possible to avoid the occurrence of high-frequency vibration which may occur in connection with the blocking of the idling vibration.

[0006] 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 through a first orifice connecting between the main chamber and the sub-chamber, Thus, the engine shake is absorbed and cut off. That is, since the vibration related to the engine shake has a frequency of about 10 Hz, it is difficult to cut off the vibration by reducing the dynamic spring constant. Therefore, in the present invention, a constant negative pressure is continuously introduced into the equilibrium chamber forming the vibration isolation mechanism, and the second diaphragm forming the equilibrium chamber is pulled down, and the equilibrium chamber is lowered. Volume to zero. This prevents a volume change in the third liquid chamber connected to the main chamber. In such a state, when the vibration from the vibrating body is propagated to the insulator, the lower surface of the insulator vibrates according to the vibration, and the liquid in the main chamber is positively moved to the sub-chamber side. Operates to flow. As a result, the liquid in the main chamber
It flows to the sub-chamber side through the first orifice. A predetermined damping force is generated by the viscous resistance caused by the flow of the liquid, and the engine shake is suppressed (attenuated) by the damping force.

Next, the invention according to claim 2 will be described. This is also basically the same as the first aspect. The characteristic feature is that a second orifice (second orifice) that forms the vibration isolating mechanism and connects the main chamber and a third liquid chamber (third liquid chamber) is formed. , The volume of which can be changed. That is, the second orifice, of its diameter and length, it was decided to adopt a configuration in which as possible changes to those at least one. Such a configuration
By adopting, in the thing of the present invention,
Blocks and controls various vibrations including ring vibration.
Will be done. In particular, in the present invention,
Of the second orifice connecting between the main chamber and the third liquid chamber,
Its volume is its diameter, forming this second orifice
Or by changing the length,
The engine is activated by the operation of various accessories.
If the idling vibration fluctuates,
Will be able to do it. In other words, for the operation of accessories, etc.
Therefore, when the engine speed is idle-up, etc.
In response to this idle-up frequency,
The volume of the second orifice can be varied. this
Idling vibration in idle-up state
Can be efficiently shut down.
Swell.

Next, the invention according to claims 3 and 4 will be described. First, in the invention according to claim 3, the upper connecting member attached to the vibrating body, the lower connecting member attached to the member on the vehicle body side, and the upper connecting member and the lower connecting member interposed between the upper connecting member and the lower connecting member. An insulator that absorbs and blocks vibration, a main chamber in which a chamber wall is formed by a part of the insulator and a liquid is sealed, and the main chamber is connected to the main chamber via a first orifice. A first diaphragm, a sub-chamber as a part of the chamber wall, and a third liquid chamber connected to the main chamber via a second orifice and formed to introduce liquid in the main chamber. An equilibrium chamber which is formed so as to be partitioned by the second diaphragm with respect to the third liquid chamber, and is formed such that one of atmospheric pressure and negative pressure is introduced. It will be At the same time, either one of negative pressure or atmospheric pressure is continuously introduced into the equilibrium chamber having such a configuration, or alternately introduced in a state synchronized with engine vibration. A switching means for performing a switching operation is provided, and a control means for controlling the switching operation of the switching means is provided.
When the atmospheric pressure or the negative pressure is alternately introduced into the equilibrium chamber in a state synchronized with the engine vibration, the liquid present in the second orifice resonates with the volume change state in the equilibrium chamber. The volume of the second orifice is set so that the generated wave formed in the entire vibration isolating mechanism becomes a normal sine wave. By adopting such a configuration, in the invention according to the third aspect, noise or the like of a high-frequency component which may be generated by a change in volume (vibration) in the equilibrium chamber is caused by a resonance action of the liquid in the second orifice. It can be removed. As a result, absorption and cutoff of idling vibration and the like are performed accurately. According to a fourth aspect of the present invention, there is provided a liquid filled type vibration damping device according to the first aspect.
By forming at least one of the diameter and the length of the second orifice appropriately, the liquid present in the second orifice changes in volume in synchronization with engine vibration. It was set to resonate with the volume change state in the equilibrium chamber. By adopting such a configuration, in the invention according to the fourth aspect, the generated wave (force wave) formed by the vibration isolation mechanism can be a normal form of a sine wave, The generated force (vibration energy) can also be set to a large value. This makes it possible to accurately absorb and cut off various vibrations including the idling vibration. In addition, high frequency component noise or the like that may be caused by a change in volume (vibration) in the equilibrium chamber can be removed by the resonance action of the liquid in the second orifice. As a result, absorption and cutoff of idling vibration and the like are performed accurately.

[0009]

DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described with reference to FIG. Although related to the embodiment of the present invention, the configuration is such that an upper connecting member 6 attached to the vibrating body, a lower connecting member 9 attached to a member or the like on the vehicle body side, and the upper connecting member 6 and the lower connecting member 9 An insulator 2 is provided between the insulator 2 for absorbing and blocking vibration from the vibrating body, and a main chamber 12 and a sub-chamber 16 which are provided in series with the insulator 2 and are filled with a liquid which is an incompressible fluid. And a part of the vibration isolating mechanism 1, which is formed by a liquid chamber and the like, and is partitioned between the third liquid chamber 123 and the second diaphragm 11. A switching means 3 for performing a switching operation so that either one of the negative pressure or the atmospheric pressure is introduced into the equilibrium chamber 13 continuously or alternately in synchronization with engine vibration; This And control means 5 for controlling the switching operation of the switching means 3, in which the basic in that it consists of.

In such a basic configuration, the insulator 2 is made of a rubber-like elastic material such as a vibration-proof rubber material, and one end face of the insulator 2 is integrated with the upper connecting member 6 by a vulcanization bonding means or the like. It is something that is to be combined. The vibration isolator 1 provided in series with the insulator 2 is provided below the insulator 2 continuously with the insulator 2 and has a main chamber 12 in which liquid is sealed. When,
A third liquid chamber 123 connected to the main chamber 12 via a second orifice 125 and formed so that the liquid in the main chamber 12 is introduced, and a third liquid chamber 123 with respect to the third liquid chamber 123. The two-diaphragm 11 is divided and formed. The equilibrium chamber 13 to which a negative pressure or an atmospheric pressure is introduced, and the main chamber 12 are provided with a partition plate 14 therebetween. Subchamber 1 in which liquid is sealed, as in 12
6, a first orifice 15 for connecting between the main chamber 12 and the sub-chamber 16, and a first diaphragm 17 provided below the sub-chamber 16 via a first diaphragm 17, so that air is always introduced. And an air chamber 18.

The structure around the second diaphragm 11 forming the vibration isolating mechanism 1 having such a structure will be described. That is, the second diaphragm 11
Is provided between the third liquid chamber 123 communicating with the main chamber 12 and the equilibrium chamber 13 into which the negative pressure or the atmospheric pressure is introduced. That is, the second orifice 1 having a predetermined volume is provided on one surface side (upper surface side).
25, a liquid in the main chamber 12 is introduced through the liquid supply chamber 25, and a third liquid chamber 123 formed so that fluctuations in the liquid pressure in the main chamber 12 are constantly transmitted. It is. On the other side (lower side), an equilibrium chamber 13 into which a negative pressure or an atmospheric pressure is introduced based on the operation of the switching means 3 is provided.

Incidentally, the main chamber 1 having the above-described structure is used.
The second orifice 1 connecting between the second and third liquid chambers 123
25 is the volume of the present embodiment,
It can be changed (changed) by changing the orifice diameter or the orifice length.
Specifically, for example, in FIG.
25, an inflow port 12 which is an opening to the main chamber 12 side.
1 is the second orifice 1 provided in an annular shape.
25 can be moved arbitrarily. By changing the position of the inflow port 121, the length of the second orifice 125 can be changed. The movement of the position of the inflow port 121 can be automatically controlled by using an existing electromagnetic mechanism (solenoid) or the like.

Next, the switching means 3 which operates to introduce the negative pressure or the atmospheric pressure into the equilibrium chamber 13 having the above-described configuration while appropriately switching the negative pressure or the atmospheric pressure is provided with a switching valve 31 such as a three-way valve and the like. And a solenoid 32 for driving the switching valve 31. A throttle valve 35 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.

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

Next, an operation mode and the like of the embodiment having the above-described configuration will be described. That is, the vibration from the vibrating body side is propagated to the insulator 2 made of a rubber material or the like via the upper connecting member 6 as shown in FIG. Along with this, the insulator 2 vibrates or deforms to absorb or cut off most of the input vibration. Therefore, most of the vibrations are cut off at the insulator 2, but some of the vibrations are not cut off at the insulator 2 but cut off at the next vibration isolation mechanism 1. Become. Next, a specific operation of the vibration isolation mechanism 1 will be described. First, by operating the switching means 3 for idling vibration,
A negative pressure or an atmospheric pressure is alternately introduced into the equilibrium chamber 13 at a specific frequency. 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 the idling vibration input through the insulator 2. Fluctuations in the hydraulic pressure within 12 are absorbed through the third liquid chamber 123 and the second orifice 125. As a result, the dynamic spring constant of the spring system formed by the insulator 2 and the vibration isolating mechanism 1 is reduced.

Particularly in this case, in this embodiment, the main chamber 12 is connected to the main chamber 12 through a second orifice 125 having a predetermined volume.
Since the third liquid chamber 123 whose volume changes in accordance with the liquid pressure fluctuation of the liquid in the inside is provided, when the second diaphragm 11 is operated with the operation of the equilibrium chamber 13, The operation (vibration) is performed by the third liquid chamber 123 described above.
And the liquid is propagated to the liquid in the main chamber 12 via the second orifice 125. At this time, in the present embodiment, the liquid in the second orifice 125 connecting between the third liquid chamber 123 and the main chamber 12 causes the volume change in the equilibrium chamber 13 and the resonance. That is what you are going to do. As a result, the generated force (vibration energy) formed by the entire vibration isolation mechanism 1 becomes a normal sine wave, and the generated force has a large value. Thus, the absorption and cutoff of the idling vibration are accurately performed. In addition, vibration (noise) of a high-frequency component that may occur in connection with blocking of the idling vibration.
Is also suppressed by the resonance action of the liquid in the second orifice 125. In addition,
In the present embodiment, the volume of the second orifice 125 connecting the main chamber 12 and the third liquid chamber 123 has a diameter or a length that forms the second orifice 125. It can be changed by changing it. As a result, when the engine idling vibration fluctuates due to the operation of various accessories and the like, it becomes possible to cope with the fluctuation whenever necessary. That is, when the engine speed is idle-up or the like due to the operation of accessories or the like, the length or the like of the second orifice 125 is changed in accordance with the frequency of the idle-up, whereby the volume of the second orifice 125 is changed. Can be changed. As a result, the idle vibration in the idle-up state can be efficiently cut off.

In addition, the first orifice 1 that connects the main chamber 12 and the sub chamber 16 to the engine shake, which is a vibration having a lower frequency than the idling vibration.
5 to allow the liquid to flow, thereby
Absorption and shutoff of the engine shake will be performed.
That is, in the present embodiment, as shown in FIG. 1, a constant negative pressure is continuously introduced into the equilibrium chamber 13 forming the vibration isolation mechanism 1 to form the equilibrium chamber 13. The second diaphragm 11 is pulled down, and the volume of the equilibrium chamber 13 is set to zero. As a result, a change in the volume of the equilibrium chamber 13 is prevented. In such a state, when the vibration from the vibrating body is propagated to the insulator 2, the lower surface of the insulator 2 vibrates in response to the vibration, and the liquid in the main chamber 12 is actively subsided. It operates to flow to the chamber 16 side. As a result, the liquid in the main chamber 12 is supplied to the first orifice 15
And flows to the sub-chamber 16 side. A predetermined damping force is generated by the viscous resistance caused by the flow of the liquid, and the engine shake is suppressed (attenuated) by the damping force.

[0018]

According to the present invention, by adopting the above configuration, the hydraulic pressure fluctuation in the main chamber is controlled in response to various vibration inputs, and finally the dynamic spring of the liquid filled type vibration damping device is provided. It has become possible to reduce the constant and to form a high attenuation characteristic in a low frequency range. As a result, it has become possible to cut off various vibrations including idling vibration.

Further, when the equilibrium chamber is operated (vibrated) in a predetermined cycle with respect to the idling vibration, a change state of a vibration force applied to the liquid in the main chamber is represented by
A normal sine wave can be formed at the time of introduction of the negative pressure and at the time of introduction of the atmospheric pressure, so that the above-mentioned idling vibration can be accurately cut off, and noise composed of high-frequency components can be formed. Etc. can be removed.

[Brief description of the drawings]

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

FIG. 2 is a longitudinal sectional view showing the entire configuration of a conventional example.

[Description of Signs] 1 Anti-vibration mechanism unit 11 Second diaphragm (second diaphragm) 12 Main chamber 121 Inflow port (opening) 123 Third liquid chamber (third liquid chamber) 125 Second orifice (second Orifice) 13 balancing chamber 14 partition plate 15 first orifice (first orifice) 16 sub-chamber 17 first diaphragm (first diaphragm) 18 air chamber 2 insulator 3 switching means 31 switching valve 32 solenoid 35 throttle valve 5 control means 6 Upper connecting member 9 Lower connecting member

Continuation of the front page (72) Inventor Takashi Maeno 1 Ogatachi Nagahata, Kasuga-cho, Nishi-Kasugai-gun, Aichi Prefecture Inside Toyoda Gosei Co., Ltd. (56) References JP-A-10-148234 (JP, A) JP-A-61-226329 (JP, A) JP-A-3-84238 (JP, A) JP-A-4-370432 (JP, A) JP-A-59-103045 (JP, A) JP-A-60-179543 (JP, A) JP-A-7-91483 (JP, A) JP-A-62-270841 (JP, A) JP-A-62-292940 (JP, A) JP-A-4-77041 (JP, U) JP-A-60-139939 (JP, U) JP, U) JP-A 63-27739 (JP, U) Japanese Patent Publication No. 6-29634 (JP, B2) German Patent Application Publication 4121939 (DE, A1) (58) Fields investigated (Int. Cl. ⁷⁾ , DB name) F16F 13/26 B60K 5/12

Claims (4)

(57) [Claims] An upper connecting member attached to a vibrating body, a lower connecting member attached to a member on a vehicle body side,
An insulator between the upper connecting member and the lower connecting member for absorbing and blocking the vibration from the vibrating body, and a part of the insulator having a chamber wall formed therein, and a main body in which liquid is sealed. And a sub-chamber connected to the main chamber via a first orifice and having the first diaphragm as a part of the chamber wall, and a sub-chamber connected to the main chamber via a second orifice and A third liquid chamber formed so that liquid in the chamber is introduced, and a third diaphragm formed with respect to the third liquid chamber by a second diaphragm, and one of atmospheric pressure and negative pressure And an equilibrium chamber formed so that one of them is introduced, and one of negative pressure and atmospheric pressure is continuously introduced into the equilibrium chamber having such a configuration. Or d Switching means for performing a switching operation so as to be alternately introduced in a state synchronized with the gin vibration is provided, control means for controlling the switching operation of the switching means is provided, and the second orifice is further provided in the equilibrium chamber, When the atmospheric pressure or the negative pressure is alternately introduced in a state synchronized with the engine vibration, the liquid present in the second orifice resonates with the volume change state in the equilibrium chamber. Liquid-filled vibration isolator. 2. The liquid-filled type vibration damping device according to claim 1, wherein said vibration damping mechanism is formed and said second orifice connects between the main chamber and the third liquid chamber. A liquid-filled type vibration damping device characterized in that at least one of a diameter and a length can be changed. 3. An upper connecting member attached to the vibrating body, a lower connecting member attached to a member on the vehicle body side,
An insulator between the upper connecting member and the lower connecting member for absorbing and blocking the vibration from the vibrating body, and a part of the insulator having a chamber wall formed therein, and a main body in which liquid is sealed. And a sub-chamber connected to the main chamber via a first orifice and having the first diaphragm as a part of the chamber wall, and a sub-chamber connected to the main chamber via a second orifice and A third liquid chamber formed so that liquid in the chamber is introduced, and a third diaphragm formed with respect to the third liquid chamber by a second diaphragm, and one of atmospheric pressure and negative pressure And an equilibrium chamber formed so that one of them is introduced, and one of negative pressure and atmospheric pressure is continuously introduced into the equilibrium chamber having such a configuration. Or d Switching means for performing a switching operation so as to be alternately introduced in a state synchronized with the gin vibration; control means for controlling the switching operation of the switching means; and furthermore, an atmospheric pressure or a negative pressure is supplied to the engine in the equilibrium chamber. When the liquid is alternately introduced in synchronization with the vibration, the liquid present in the second orifice changes in volume in the equilibrium chamber.
Wherein the volume of the second orifice is set so that the generated wave formed in the entire vibration isolating mechanism by resonance with the state becomes a normal sine wave. apparatus. 4. The liquid-filled type vibration damping device according to claim 1, wherein the second orifice is formed by appropriately selecting at least one of a diameter and a length thereof. A liquid-filled vibration damping device characterized in that the liquid present in the orifice resonates with the volume change state in the equilibrium chamber in which the volume changes in synchronization with engine vibration.