JPH01193426A - Liquid-in type mounting device - Google Patents

Abstract

PURPOSE:To display excellent vibration isolating effect to input vibration included in a wide vibration range by tuning the first and the second throttling passage and a movable means to low, medium and high frequencies respectively, and a movable part of the second partitioning member to a frequency higher than the above mentioned frequencies. CONSTITUTION:The first and the second throttling passage 50, 60 and a movable plate 58 are tuned to low, medium and high frequencies respectively, and a movable part of the second partitioning member 36 is tuned to a frequency higher than the above-mentioned frequencies. Input vibrations having the low frequency and large amplitude, and the medium frequency and small amplitude respectively can therefore be excellently damped and cut off on the basis of the liquid resonating action of incompressible fluid flowing through the first and the second throttling passage 50, 60, and the input vibration having the high frequency and minute amplitude can be excellently cut off on the basis of the deformation or displacement of the movable plate 58. Thus excellent vibration isolating effect can be displayed to the input vibration included within a wide frequency range.

Description

DETAILED DESCRIPTION OF THE INVENTION (Technical Field) The present invention relates to a fluid-filled mount device such as an automobile engine mount, and particularly to a fluid-filled mount device for an automobile engine mount, etc. This invention relates to a fluid-filled mount device that can exhibit a blocking effect.

(Prior Art) Mounting devices such as automobile engine mounts are generally required to exhibit a good damping effect against input vibrations of low frequency and large amplitude, and are also required to exhibit a good damping effect against input vibrations of medium frequency and small amplitude and high frequency minute vibrations. It is required to exhibit a good blocking effect against high-amplitude input vibrations, and in particular, a good damping effect is required against low-frequency, large-amplitude input vibrations. Therefore, in recent years, as such a mounting device, a first support body and a second support body are arranged at a predetermined distance from each other in the vibration input direction; a rubber elastic body that is elastically connected;
A partition member, at least a part of which is formed of a predetermined flexible membrane, is disposed on the second support side and forms a fluid accommodation space which is partially defined by the rubber elastic body. ; a predetermined incompressible fluid sealed within the fluid storage space;
a partition member disposed on the second support body side to partition the fluid accommodation space into a pressure receiving chamber on the rubber elastic body side and an equilibrium chamber on the partition wall member side; A so-called fluid-filled mounting device has been proposed that includes a constriction passage for communication.

According to the fluid-filled mounting device having such a structure, input vibrations in a frequency range set for the throttle passage can be effectively damped based on the liquid column resonance effect of the incompressible fluid flowing through the throttle passage. By tuning the throttle passage to a low frequency, it is possible to satisfactorily attenuate low frequency, large amplitude input vibrations.

However, in a fluid-filled mounting device with such a structure, as mentioned above, although low-frequency large-amplitude input vibrations can be well damped by tuning the throttle passage to a low frequency, medium-frequency In response to input vibrations of small amplitude and high frequency minute amplitude, there is a problem in that the incompressible fluid becomes difficult to flow through the throttle passage, and the vibration damping function (blocking function) is rather deteriorated.

On the other hand, in a fluid-filled mounting device having the structure described above, the partition member is deformed or displaced by a predetermined dimension in the vibration input direction so as to absorb the fluid pressure difference between the pressure receiving chamber and the equilibrium chamber. A fluid-filled mounting device has been proposed that may include a movable means. According to the fluid-filled mount device having such a structure, based on the fact that the movable means is deformed or displaced in the vibration input direction, it is possible to effectively block input vibration in a frequency range set for the movable means. Therefore, by tuning the movable means to a medium or high frequency,
Small amplitude vibrations in the medium frequency range or minute amplitude vibrations in the high frequency range corresponding to the tuning frequency of the movable means can be effectively blocked.

(Problem) However, even in a fluid-filled mounting device with such a structure, large amplitude vibrations in the low frequency range set for the throttle passage, and small amplitude vibrations in the medium frequency range set for the movable means. Although it can exhibit a good vibration isolation effect (damping or blocking effect) for either small amplitude vibrations in the high frequency range, small amplitude vibrations in the medium frequency range or small amplitude vibrations in the high frequency range. Regarding the other one, there was a problem that a good blocking effect could not be exhibited.

(Solution Means) Against this background, the present invention provides a fluid-filled mount Wil that can satisfactorily attenuate or block input vibrations of low frequency large amplitude, medium frequency small amplitude, and high frequency minute amplitude. The purpose of this project is to provide a fluid-filled mounting device (a).
) first and second supports disposed at a predetermined distance from each other in the vibration input direction; and (b) rubber elasticity elastically connecting the first support and the second support. The body and (
C) A partition wall, at least partially made of a predetermined flexible membrane, disposed on the second support side and forming a fluid accommodation space partially defined by the rubber elastic body. The parts and (
d) a predetermined incompressible fluid sealed in the fluid accommodating space; and (e) a predetermined incompressible fluid that is disposed on the second support body and that connects the fluid accommodating space to the pressure receiving chamber on the rubber elastic body side and the partition wall. a first partition member partitioning into a member-side equilibrium chamber; and (f) disposed on the first partition member or the second support to form an intermediate chamber between the first partition member; a second partition member, at least a part of which is a movable part that can be displaced by a predetermined dimension in the vibration input direction with respect to the first partition member so as to absorb a fluid pressure difference between chambers on both sides thereof; (g) a first throttle passage provided to allow the pressure receiving chamber and the equilibrium chamber to communicate with each other; and (h) a first restricting passage provided to allow the first partition member to absorb a fluid pressure difference between the chambers on both sides thereof. (i) a movable means provided to be capable of deforming or displacing a predetermined dimension in the vibration input direction; and (i) a movable means provided to allow chambers on both sides of the second partition member to communicate with each other. and a second throttle passage.

(Function/Effect) According to the fluid-filled mount device having such a structure, like the conventional fluid-filled mount device, by tuning the first throttle passage to a low frequency, the first throttle passage Based on the liquid column resonance effect of the flowing incompressible fluid, large amplitude vibrations in the low frequency range can be well damped.

Further, according to such a fluid-filled mounting device, the incompressible fluid is caused to flow through the second throttle passage based on the deformation or displacement of the movable means, so that the second throttle passage is tuned to a medium frequency. At the same time, by tuning the movable means to a higher frequency range, the incompressibility of the flow through the second throttle passage is reduced when vibration is input in the medium frequency range corresponding to the tuning frequency of the second throttle passage. It is possible to induce liquid column resonance in the fluid, and based on the liquid column resonance effect, small amplitude vibrations in the medium frequency range can be effectively blocked.

Furthermore, in such a fluid-filled mounting device, the movable means is allowed to deform or be displaced based on the displacement of the movable part of the second partition member, so the movable means is tuned to a high frequency and the movable means is tuned to a high frequency. By tuning the movable part of the second partition member to a frequency higher than the tuning frequency of the movable means, when vibration is input in a high frequency range corresponding to the tuning frequency of the movable means,
It is possible to induce liquid column resonance in the incompressible fluid that flows with the deformation or displacement of the movable means, and based on the liquid column resonance action, minute amplitude vibrations in the high frequency range can be effectively blocked. It is possible.

That is, according to the fluid-filled mounting device according to the present invention, the first throttle passage, the second throttle passage, and the movable means are
By tuning the movable part of the second partition member to a low frequency, a medium frequency, and a high frequency, respectively, and tuning the movable part of the second partition member to a higher frequency, an uncompressible fluid flowing through the first restricting passage and the second restricting passage is Based on the liquid column resonance effect of the magnetic fluid, it is possible to effectively attenuate and block input vibrations of low frequency, large amplitude and medium frequency, small amplitude. It can effectively block input vibrations of various amplitudes, and exhibits a good vibration isolation effect (damping or blocking effect) against input vibrations in a wider frequency range than conventional fluid-filled mounting devices. It is possible.

(Example) Hereinafter, in order to clarify the present invention more specifically,
One embodiment thereof will be described in detail based on the drawings.

First, FIG. 1 shows an example of an engine mount for an automobile, which is an embodiment of a fluid-filled mount device according to the present invention. There, 10.12 is a first support metal fitting and a second support metal fitting as a first support body and a second support body, respectively, and is a predetermined support metal fitting in the vibration input direction (vertical direction in the figure). placed at a distance.

The first support fitting 10 has a thick disk shape with a relatively small diameter, and is arranged so that its center line is in the vibration input direction. On the other hand, the second support fitting 12 has a relatively large diameter bag-like structure in which an opening fitting 16 is integrally caulked and fixed to the opening of the bottom fitting 14, and the inner space thereof is the first support fitting 12. The first support metal fitting 1 is opened on the support metal fitting 10 side of the first support metal fitting 1.
It is arranged concentrically with o. Here, the annular rubber elastic body 18 fluid-tightly closes the opening of the second support fitting 12, and the outer circumference of the first support fitting 10 and the second supporting metal fittings 12
It is integrally vulcanized and bonded to the inner circumferential surface of the opening.
As a result, the first support metal fitting 10 and the second support metal fitting 12
are elastically connected by a rubber elastic body 18.

In addition, in FIG. 1, 20 is a mounting bolt erected on the first support metal fitting 10, and 22, 22 is a mounting bolt erected on the bottom metal fitting 14 of the second support metal fitting 12. . The engine mount of this embodiment is attached to the vehicle body side or the engine side by the mounting bolts 20 of the first support metal fittings 10, while the second support metal fittings 1
It is attached to the engine side or the vehicle body side by two mounting bolts 22 and 22, so that the engine or the power unit including the engine is supported against the vehicle body in a vibration-proof manner.

Further, in FIG. 1, reference numeral 24 denotes an annular reinforcing metal fitting embedded in the rubber elastic body 18 concentrically with the rubber elastic body 18.

The second support fitting 12 has a diaphragm 26 as a partition member made of a rubber elastic membrane (flexible membrane), the peripheral edge of which is fluid-tightly held between the bottom metal fitting 14 and the opening metal fitting 16. It is arranged. 5 As a result, a sealed space is formed between the diaphragm 26 and the first support fitting 10 as a fluid storage space, which is partially defined by the rubber elastic body 18. A predetermined incompressible fluid such as water or polyalkylene glycol is sealed within the closed space. Note that the space between the diaphragm 26 and the bottom metal fitting 14 is an air chamber 28 for allowing the diaphragm 26 to deform.

Further, a first partition member 30 is disposed on the second support fitting 12, with the peripheral edge held fluid-tight between the bottom fitting 14 and the opening fitting 16, similarly to the diaphragm 26. The fluid accommodation space is separated by the first partition member 30 from the pressure receiving chamber 32 on the rubber elastic body 18 side and the diaphragm 26.
It is partitioned into an equilibrium chamber 34 on the side. Here, a second partition member 36 is disposed on the surface of the first partition member 30 on the equilibrium chamber 34 side, and a space between this second partition member 36 and the first partition member 30 is provided. An intermediate chamber 38 having a variable volume is formed therein.

Here, the first partition member 30 has a structure in which two partition fittings 40 and 42 are stacked one on top of the other, and the outer periphery is defined by the partition fittings 40 and 42. An annular space 44 extending in the circumferential direction is formed.

Here, the annular space 44 is communicated with the pressure receiving chamber 32 and the equilibrium chamber 34 through communication holes 46 and 48 formed in the partition fittings 40 and 42, respectively. A first throttle passage 50 is formed which allows the balance chambers 34 to communicate with each other.

When vibration is input between the first support fitting 10 and the second support fitting 12 and a fluid pressure difference is induced between the pressure receiving chamber 32 and the equilibrium chamber 34, the pressure receiving chamber 32 and the equilibrium chamber 34
The incompressible fluids in the incompressible fluids can be made to flow into each other through the first constriction passages 50, based on the liquid column resonance effect of the incompressible fluids flowing through the first constriction passages 50. Therefore, the input vibration in the frequency range set for the first throttle passage 50 can be effectively damped.

In addition, here, the first throttle passage 50 is 5 to 15
It is tuned to a frequency corresponding to a low frequency range of about Hz, and thereby, based on the liquid column resonance effect of the incompressible fluid flowing through the first throttle passage 50, the engine shake of about 5 to 15 Hz is suppressed. Input vibrations in the low frequency range, such as

On the other hand, in the inner peripheral portion of the first partition member 30, there is a partition fitting 40.42 defined by the partition fitting 40.42, similar to the annular space 44 constituting the first throttle passage 50 described above.
Through each of the plurality of communication holes 52 and 54 formed in 42,
A disk-shaped space 56 with a predetermined gap is formed which communicates with the pressure receiving chamber 32 and the intermediate chamber 38 on both sides thereof.

A movable means made of a rubber material or the like is placed in this disk-shaped space 56 in a state that blocks the pressure receiving chamber 32 and the intermediate chamber 38 and is movable (displaced) by a certain distance α in the vibration input direction. A disc-shaped movable plate 58 is provided as a movable plate. When a fluid pressure difference is generated between the pressure receiving chamber 32 and the intermediate chamber 38, the movable plate 58 can move by a distance α in a direction to absorb the fluid pressure difference.

Note that the movable plate 58 is tuned here to a higher frequency than the tuning frequency of the second throttle passage 60, which will be described later, based on the shape of the communication hole 52, 54, etc. When inputting vibrations in a frequency range corresponding to the tuning frequency of 60, it is possible to smoothly move in the direction of inputting vibrations according to the human force of the vibrations.

Further, the second partition member 36 is arranged so that the disc-shaped space 56
It consists of a partition fitting 62 having a planar shape substantially similar to that of the partition fitting 62, and an annular fitting 66 forming an annular space 64 between the partition fitting 62 and the partition fitting 62. As shown in FIG. 1, the second partition member 36 fixes the outer peripheral edge of the partition fitting 62 to the partition fitting 42 of the first partition member 30 and the partition fitting 42. Annular metal fitting 68 provided
The movable distance of the movable plate 58 between: α
It is held movably in the vibration input direction by a distance smaller than . 38 is formed. Note that annular buffer rubber layers 74 and 74 are provided on both sides of the outer peripheral edge of the partition fitting 62, respectively, to reduce the impact when the partition fitting 42 and the annular fitting 68 come into contact.

Incidentally, the annular space 64 is communicated with the equilibrium chamber 34 and the intermediate chamber 38 through communication holes 70 and 72 formed in the partition fitting 62 and the annular fitting 66, respectively. A second constriction passage 60 is formed which allows the passages 38 to communicate with each other. And here, the second throttle passage 60 is
As described above, when the vibration is input in a frequency range that is tuned to a frequency lower than the tuning frequency of the movable plate 58 and corresponds to the tuning frequency of the second throttle passage 60, the second throttle passage 60 is Liquid column resonance is induced in the flowing incompressible fluid, and based on the liquid column resonance effect, input vibration in a frequency range corresponding to the tuning frequency of the second throttle passage 60 is effective. It is designed to be blocked by

Further, here, the tuning frequency of the second partition member 36 is set to a higher frequency than the tuning frequency of the movable plate 58, and when vibration is input in a frequency range corresponding to the tuning frequency of the movable plate 58, Liquid column resonance is induced in the incompressible fluid that is caused to flow as the movable plate 58 is displaced, and based on the liquid column resonance, the frequency range corresponding to the tuning frequency of the movable plate 58 is adjusted. Input vibration is effectively blocked.

By setting the tuning frequency of the second throttle passage 60 to be lower than the tuning frequency of the movable plate 58, the movable plate 58 can prevent vibration input even when vibration is input in a frequency range corresponding to the tuning frequency of the second throttle passage 60. Based on the movement of the movable plate 58, the second throttle passage 6
This allows the incompressible fluid to flow effectively.

Therefore, when vibration is input in a frequency range corresponding to the tuning frequency of the second throttle passage 60, liquid column resonance is induced in the incompressible fluid flowing through the second throttle passage 60, and the liquid column resonates. Based on the resonance effect, input vibrations in a frequency range corresponding to the tuning frequency of the second throttle passage 60 are effectively blocked.

Furthermore, if the tuning frequency of the second partition member 36 is set to a higher frequency than the tuning frequency of the movable plate 58, when vibration is input in a frequency range corresponding to the tuning frequency of the movable plate 58, the incompressible fluid Even if it becomes difficult to flow through the throttle passage 60, the movable plate 58 can be smoothly moved in the vibration input direction based on the movement of the second partition member 36 in the vibration input direction. Along with the movement,
A substantially incompressible fluid is caused to flow between the balance chamber 34 and the intermediate chamber 38. Therefore, when vibration is input in a frequency range corresponding to the tuning frequency of the movable plate 58, liquid column resonance is induced in the incompressible fluid that is made to flow as the movable plate 58 moves, and this liquid column resonance Based on this action, input vibrations in a frequency range corresponding to the tuning frequency of the movable plate 58 are effectively blocked.

Note that here, the second throttle passage 60 has a diameter of 20 to 50
The movable plate 58 is tuned to correspond to a medium frequency range of about Hz, and the tuning frequency of the movable plate 58 is tuned to correspond to a high frequency range of about 100 to 300 Hz.
Based on the liquid column resonance effect of an incompressible fluid flowing through 2
Small amplitude vibrations in the medium frequency range such as idle vibrations of about 0 to 50 Hz can be effectively blocked, and the movable plate 58 can be moved (displaced) in the vibration input direction.
Based on this, input vibrations in a high frequency range such as engine transmitted sound of about 100 to 300 Hz can be effectively blocked.

Further, the movable distance of the movable plate 58: α, and the movable distance of the second partition member 36: β,
The vibration amplitude in the frequency range set for the second throttle passage 60 and the vibration amplitude in the frequency range set for the movable plate 58 are respectively set. Distance: α and β are
Generally, within the range of about 0.3 to 1.211 and 0.
Each will be set within a range of about 1 to 0.51.

According to the engine mount having such a structure, as described above, based on the liquid column resonance effect of the incompressible fluid flowing through the first throttle passage 50, large low-frequency waves such as engine shake of about 5 to 15 Hz can be suppressed. 20 to 50 Hz, respectively, based on the liquid column resonance effect of the incompressible fluid flowing through the second throttle passage 60 and the movement of the movable plate 58 in the vibration input direction. It can effectively block medium frequency small amplitude vibrations of about 100 to 300 Hz and high frequency minute amplitude vibrations of about 100 to 300 Hz. It is possible to exert a vibration effect.

Next, another example of the automobile engine mount according to the present invention will be explained based on FIG. 2. Note that the engine mount of this example is different from the engine mount of the previous example.
Since the only difference is the structure of the second partition member 36, only the structure of the second partition member 36 will be described in detail here.

That is, in the engine mount shown in FIG. 2, the second partition member 36 is composed of a single annular metal plate 76. The inner circumferential edge of the metal plate 76 is a cylindrical portion 78 having a predetermined length and cross-sectional area that extends toward the equilibrium chamber 34 , and the inner hole of this cylindrical portion 78 is connected to the second throttle passage 60 . It is said that

Even in an engine mount that employs such a structure as the second partition member 36, the second throttle passage 60
By tuning to correspond to the medium frequency range of about 20 to 50 Hz, it is possible to obtain the same anti-vibration function as in the embodiment described above.

Further, FIG. 3 shows still another example of the automobile engine mount according to the present invention. That is, there, an annular metal fitting 68 that holds the second partition member 36 between the first partition member 30 and the second partition member 36 is fixed to the first partition member 30 on the pressure receiving chamber 32 side. As the partition member 36, a metal plate 76 similar to the embodiment shown in FIG.
is arranged on the pressure receiving chamber 32 side. The second throttle passage 60 is formed as an inner hole of the cylindrical portion 78 of the metal plate 76 extending toward the pressure receiving chamber 32, and the second throttle passage 60 is similar to the embodiment described above. 20~
It is tuned to correspond to the medium frequency range of about 50H2. Note that the other structures are substantially the same as those in the above embodiment.

Even in the engine mount having such a structure, the same vibration-proofing function as the engine mount of the above embodiment can be obtained.

Although a few embodiments of the present invention have been described above, these are literal illustrations, and it goes without saying that the present invention should not be interpreted as being limited to these specific examples.

For example, in the embodiment described above, the entire second partition member 36 is a movable part, but the entire second partition member 36 does not necessarily have to be a movable part. Further, the second partition member 36 is not necessarily the first partition member 3.
0, and depending on the form of the first throttle passage 50, it is also possible to arrange it on the second support fitting 12.

Further, in the above embodiment, the movable plate 58 disposed so as to be displaceable by a predetermined dimension in the vibration input direction with respect to the first partition member 30 was employed as a movable means. It is also possible to employ, as the movable means, a membrane member disposed so as to be deformable by a predetermined dimension in the vibration input direction.

Further, in the above embodiment, the present invention is applied to an automobile engine mount, but the present invention can also be applied to mounting devices other than such automobile engine mounts.

In addition, although it is omitted to list specific examples one by one, the present invention can be implemented with various changes, modifications, improvements, etc. without departing from the spirit thereof.
It goes without saying.

[Brief explanation of the drawing]

FIG. 1 is a longitudinal sectional view showing one embodiment of the present invention, and FIGS. 2 and 3 are sectional views of essential parts each showing another embodiment of the invention. 10: First support metal fitting (first support body) 12: Second support metal fitting (second support body) 18: Rubber elastic body 26: Diaphragm (flexible membrane; partition member) 30: First Partition member 32: Pressure receiving chamber 34: Equilibrium chamber 36
: Second partition member 38: Intermediate chamber 50: First throttle passage 58: Movable plate (movable means) 60: Second throttle passage

Claims (1)

[Claims] First and second supports arranged at a predetermined distance from each other in the vibration input direction, and the first support and the second support are elastically connected. a rubber elastic body; and at least a portion of a predetermined flexible membrane, which is disposed on the second support side and forms a fluid accommodation space partially defined by the rubber elastic body. a predetermined incompressible fluid sealed in the fluid accommodation space; and a partition member disposed on the second support body side to connect the fluid accommodation space to the pressure receiving chamber on the rubber elastic body side. a first partition member that partitions into an equilibrium chamber on the side of the partition wall member; and an intermediate chamber formed between the first partition member and the first partition member that is disposed on the first partition member or the second support; so that at least a portion absorbs the fluid pressure difference between the chambers on either side thereof;
a second partition member that is a movable part that can be displaced by a predetermined dimension in the vibration input direction with respect to the first partition member; and a first partition member that is provided so as to allow the pressure receiving chamber and the equilibrium chamber to communicate with each other. a movable means provided to the first partition member so as to be deformable or displaceable by a predetermined dimension in the vibration input direction so as to absorb a fluid pressure difference between chambers on both sides of the first partition member; A fluid-filled mounting device comprising: a second throttle passage provided in a second partition member so as to allow chambers on both sides of the partition member to communicate with each other.