JPH0587179A - Liquid-filled vibration control supporting device - Google Patents

Abstract

PURPOSE:To enhance the vibration isolating performance by displaying effective damping effect respectively by the flow resistance of liquid on low frequency vibration and by the volume change of an air chamber on high frequency vibra tion. CONSTITUTION:Elastic bodies 3, 4 are interposed between an inner cylinder 1 and an outer cylinder 2 so as to form a liquid chamber 5 filled with liquid between the inner and outer cylinders 1, 2 at least by these elastic bodies 3, 4. Inside the liquid chamber 5, two baffleplates 8, 9 or orifices for generating flow resistance are provided being spaced axially by the specified distance, and an air chamber 11 with its peripheral wall formed of an elastic film 10 is disposed between two baffleplates 8, 9 or orifices in such a way as to divide the liquid chamber 5 into two in the axial direction.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a liquid-sealing anti-vibration supporting device used for supporting a vibration generating part such as an automobile engine.

[0002]

2. Description of the Related Art Conventionally, as this type of liquid seal anti-vibration support device, as disclosed in, for example, Japanese Utility Model Laid-Open No. 1-89644 and Japanese Utility Model Laid-Open No. 61-108546, an inner cylinder and an outer cylinder are disclosed. An elastic body is interposed between the elastic body and the inner and outer cylinders to form a liquid chamber in which liquid is sealed between the both cylinders, and the inner space or the outer cylinder is provided in the liquid chamber. A baffle plate that is attached to one side and forms an annular throttle portion with the other is provided, and a relative displacement particularly in the axial direction occurs between the inner and outer cylinders, and between two liquid chambers partitioned by the baffle plate. It is known that when the liquid flows, the flow restriction is generated in the narrowed portion so as to exert a vibration damping effect. In this case, it is possible to provide two baffle plates at a predetermined distance in the axial direction and set the aperture diameters of the baffle plates to be the same so that the damping effect is exerted in a peak shape at different vibration frequencies. (See Japanese Utility Model Laid-Open No. 61-108546). Further, an orifice may be provided in place of or in combination with the throttle portion of the baffle plate (see Japanese Utility Model Laid-Open No. 12547/1990).

Further, as a type different from the above-mentioned liquid seal vibration isolating support device, as disclosed in, for example, JP-A-61-55429 and JP-A-61-65933, there is a vibration generating side. An elastic body is interposed between the mounting plate and the mounting plate on the vibration receiving side to form a liquid chamber in which liquid is sealed by the elastic body, and a partition member having an orifice is provided in the liquid chamber, It is also known to provide an air chamber defined by the elastic film with the liquid chamber adjacent to one mounting plate side.

[0004]

However, of the above-mentioned conventional liquid-sealing anti-vibration supporting devices, the former one exhibits a vibration damping effect by the flow resistance generated in the narrowed portion between the rigid bodies when the liquid flows. Therefore, it is not sufficiently effective against high-frequency vibration, and when low-frequency vibration or shock input is generated, it interferes with the inner cylinder side or the outer cylinder side to cause galling. Further, there is a problem that the liquid does not flow under high frequency vibration and the damping effect cannot be exhibited.

On the other hand, in the latter case, due to the flow resistance of the liquid generated in the orifice against the low frequency vibration,
With respect to the high frequency vibration, the volume change of the air chamber, a so-called volume compensating effect, respectively exerts a damping effect. However, in this type, since the liquid chamber and the air chamber are only in contact with each other through the elastic film on only one side, there is little change in the volume of the air chamber due to high frequency vibration, and sufficient damping against high frequency vibration is achieved. There is a problem that the effect cannot be exerted.

The present invention has been made in view of the above points, and it is an object of the present invention to reduce the flow resistance of a liquid with respect to low-frequency vibrations and the damping effect with respect to a change in volume of an air chamber with respect to high-frequency vibrations. So that
It is intended to provide a liquid-sealing anti-vibration support device having excellent anti-vibration properties.

[0007]

In order to achieve the above object, the invention according to claim 1 has an elastic body interposed between the vibration generating side member and the vibration receiving side member, and at least by the elastic body. A liquid chamber in which the liquid is sealed is formed between the two members. In addition, two baffles or orifices that generate flow resistance are provided in the liquid chamber at a predetermined distance in the axial direction, and an air chamber whose peripheral wall is formed of an elastic film is provided between the two baffles or orifices. The liquid chamber is arranged so as to be divided into two in the axial direction.

The invention according to claim 2 is dependent on the invention according to claim 1, and is configured such that the liquid chambers divided into two by the air chamber can be communicated with each other by a communication passage.

A third aspect of the invention is dependent on the first aspect of the invention, and is configured such that the liquid chamber divided into two by the air chamber is formed as an independent closed space.

The invention according to claim 4 is dependent on the invention according to claim 1, wherein the baffle plate is limited to one that is provided in the liquid chamber and generates a flow resistance. And further,
A sub-chamber is formed between the baffle plate and the elastic body or elastic film, and a throttle portion that generates a flow resistance when the liquid flows between the sub-chamber and the liquid chamber outside the sub-chamber is formed. The configuration.

[0011]

With the above construction, in the invention according to claim 1,
When low frequency vibration is input from the vibration side member,
The liquid flows in the liquid chamber, and the two baffles or the orifices in the liquid chamber respectively generate flow resistance, so that the damping effect is effectively obtained. Further, when high-frequency vibration is input, the volume of the air chamber whose peripheral wall is formed by the elastic film is changed in the liquid chamber, and the damping effect is effectively obtained.

Further, according to the second aspect of the present invention, at the time of inputting the low frequency vibration, between the liquid chambers divided into two by the air chamber,
The liquid flows through the communication passage, and the flow resistance at that time also exerts a damping effect.

Further, in the invention according to claim 4, when the low frequency vibration is input, the liquid flows between the sub chamber and the liquid chamber outside thereof through the throttle portion, and the inertial mass resonance of the fluid at that time is caused. Also, the damping effect is exhibited by the flow resistance.

[0014]

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 shows a liquid-sealing anti-vibration supporting device according to a first embodiment of the present invention, in which 1 is an inner cylinder and 2 is an outer cylinder concentrically arranged on the outer periphery of the inner cylinder 1. Between the inner cylinder 1 and the outer cylinder 2, at both ends thereof, annular elastic bodies 3 and 4 are interposed, respectively, and the elastic bodies 3 and 4 and the inner and outer cylinders 1 and 2 are interposed.
Thus, a liquid chamber 5 in which a liquid such as oil is sealed is formed between the inner and outer cylinders 1 and 2. Reinforcing rings 6 and 7 are embedded in the inner and outer peripheral portions of the elastic bodies 3 and 4, respectively. The inner peripheral portions of the elastic bodies 3 and 4 reinforced by the rings 6 are the outer periphery of the inner cylinder 1. The outer peripheral edge portions of the elastic bodies 3 and 4 reinforced by the ring 7 are liquid-tightly sealed and fitted to the inner peripheral surface of the outer cylinder 2. One of the inner cylinder 1 and the outer cylinder 2 is connected to a vibration generating portion (for example, an unsprung member of an automobile suspension device), and the other is connected to a vibration receiving portion (for example, a vehicle body) that supports the vibration generating portion. Therefore, one of the inner cylinder 1 and the outer cylinder 2 serves as a vibration generating side member, and the other serves as a vibration receiving side member.

In the liquid chamber 5, two circular flat plate-shaped baffle plates 8 and 9 which are fitted to the outer peripheral surface of the inner cylinder 1 are provided at a predetermined distance in the axial direction of the inner cylinder 1. Along with
An annular air chamber 11 having a peripheral wall formed by an elastic film 10 is arranged between the baffles 8 and 9 so as to divide the liquid chamber 5 into two portions 5a and 5b in the axial direction. The both baffles 8 and 9 are configured to form a constriction between the outer peripheral edge of the baffles 8 and 9 and the inner peripheral surface of the outer cylinder 2 to generate flow resistance.
The outer diameters of the baffles 8 and 9 are set to be different from each other.

The elastic film 10 has a central boss portion 10a fitted on the outer peripheral surface of the inner cylinder 1 and the central boss portion 10a.
From each of the first and second side wall portions 10b, 10 extending toward the outer cylinder 2 side and forming one side wall of the air chamber 10 with each other.
c, and outer peripheral fitting portions 10d, which are respectively connected to the outer peripheral edges of the side wall portions 10b, 10c and are fitted to the inner peripheral surface of the outer cylinder 2.
And 10e. Before being assembled to the inner cylinder 1 and the outer cylinder 2, the elastic film 10 is formed such that the first and second side wall portions 10b and 10c spread in directions away from each other, as shown in FIG. The outer peripheral edge portions of the both side wall portions 10b and 10c or the outer peripheral fitting portion 10 at the time of assembly.
The ring-shaped air chamber 11 that surrounds the outer circumference of the inner cylinder 1 is formed by assembling the d and 10e in a state where they are in contact with each other. The central boss portion 10a and the outer peripheral fitting portion 1
Reinforcing rings 12, 13, 13 are provided on 0d, 10e, respectively.
The central boss portion 1 in which is embedded and reinforced by this ring 12.
0a is liquid-tightly sealed and fitted to the outer peripheral surface of the inner cylinder 1, and outer peripheral fitting portions 10d and 10e reinforced by the rings 13 and 13 are liquid-tightly sealed and fitted to the inner peripheral surface of the outer cylinder 2.

As shown in FIG. 2, a communication passage 14 is formed in the central boss portion 10a by cutting off a part of the inside of the reinforcing ring 10, and the liquid divided in the air chamber 10 is formed. The two parts 5a, 5b of the chamber 5 are
And these two parts 5
The same liquid is enclosed in a and 5b.

Further, of the above two elastic bodies 3 and 4,
The one elastic body 3 (upper side in the drawing) is formed such that the outer peripheral edge side fitted into the outer cylinder 2 is closer to the baffle plate 8 than the inner peripheral edge side, and the elastic body 3 has an obstruction. An annular bulging portion 1 bulging on the baffle plate 8 at a portion corresponding to the outer peripheral edge of the plate 8.
6 is formed. Therefore, the elastic body 3 and the baffle plate 8
A sub-chamber 15 is formed between the sub-chamber 15 and the liquid chamber 5 (the upper portion 5a in the figure) outside the sub-chamber 15 by the bulging portion 16 and the outer peripheral edge of the baffle plate 8. A throttle portion 17 is formed which generates inertial mass resonance of the fluid and flow resistance when the liquid flows between them.

Next, to explain the operation and effect of the first embodiment, the low and high frequency vibrations are input from the inner cylinder 1 or the outer cylinder 2 which is the vibration generating side member, and the vibration receiving side member. When the liquid is transmitted to the outer cylinder 2 or the inner cylinder 1, the liquid flows in the two parts 5a and 5b of the liquid chamber 5, and the baffles 8 and 9 in the parts 5a and 5b resist the flow. As a result, the low and high frequency vibration damping effect is exhibited.
At this time, since the two baffles 8 and 9 are provided with different outer diameters, respectively, the vibration transmissibility is reduced with respect to vibrations of different frequencies, and the vibration isolation is enhanced in a wide frequency range. be able to.

Moreover, in this embodiment, in particular, the air chamber 11
The two parts 5a and 5b of the liquid chamber 5 divided by
4, the liquid flows through the communication passage 14 at the time of input of low-frequency vibration, so that flow resistance is generated in the communication passage 14 and a damping effect can be exerted. Further, a sub chamber 15 is formed between the one elastic body 3 and the baffle plate 8,
The sub chamber 15 and the liquid chamber 5 outside the sub chamber 15 (specifically, the upper portion 5
Since the liquid flows through the throttle portion 17 between a) and
Even in the throttle portion 17, the inertial mass resonance of the fluid and the flow resistance can be generated to reduce the vibration transmissibility, so that the vibration damping property can be remarkably enhanced.

On the other hand, when a higher high-frequency vibration is input from the vibration generating side, the volume of the air chamber 11 whose peripheral wall is formed by the elastic film 10 in the liquid chamber 5 changes so that a so-called volume compensating effect is produced to make it rigid. Prevent. At that time, since the outer surface of the air chamber 11 is surrounded by the elastic film 10 and is in contact with the liquid in the liquid chamber 5 through the elastic film 10, the volume of the air chamber 11 against high frequency vibration is high. Deformation is likely to occur, and the volume compensation effect can be effectively exhibited. Therefore, in the present embodiment, it is possible to effectively exert the damping effect on a wide range of vibration from low frequency to high frequency.
Anti-vibration property can be effectively enhanced.

In the first embodiment, in order to enhance the inertial mass resonance effect of the fluid when high frequency vibration is input,
A sub-chamber 15 is formed between the elastic body 3 and the baffle plate 8, and when the liquid flows between the sub-chamber 15 and the liquid chamber 5 outside the sub-chamber 15, resonance and a flow resistance are generated. However, according to the present invention, as shown in FIG. 4, the air chamber 11 is formed on the outer peripheral edge of the baffle plates 21 and 22 fitted in the outer peripheral surface of the inner cylinder 1 and provided in the liquid chamber 5. The flanges 21a and 22a extending toward the elastic film 10 are formed, and the baffle plate 2
A sub-chamber 23 is formed between the sub-chambers 1 and 22 and the elastic film 10, and the liquid flows between the sub-chamber 23 and the liquid chamber 5 outside the sub-chamber 23 by the flange portions 21a and 22a and the elastic film 10. The throttle portion 24 may be configured to generate the inertial mass resonance of the fluid and the flow resistance when the flow is performed.

5 to 11 show a liquid-sealing vibration-damping support device according to a second embodiment of the present invention.

In FIG. 5, reference numerals 31 and 32 respectively denote a pair of mounting members having heads 31a and 32a at their tips. One of the mounting members 31 and 32 is connected to the vibration generating portion, and the other is connected to the vibration generating portion. It is adapted to be connected to a vibration receiving portion that supports the vibration generating portion. Reference numeral 33 denotes a first cylindrical member arranged on the outer circumference of the head portion 31a of one (upper side in the drawing) of the mounting member 31. Between the first elastic body 34
Is installed. Reference numeral 35 denotes a second cylindrical member arranged on the outer circumference of the head 32a of the other (lower side in the figure) mounting member 32, and the inner peripheral surface of one end of the cylindrical member 35 and the head 32a of the mounting member 32. A second elastic body 36 is interposed between the outer peripheral surface and the outer peripheral surface. The other end portions of the first and second cylindrical members 33, 35 are connected to each other, and the both cylindrical members 33, 35 and the first and second elastic bodies 34, 35 are connected.
Thus, a liquid chamber 37 in which a liquid is sealed is formed between the mounting members 31 and 32.

In the liquid chamber 37, two spiral orifices 41, 42 are arranged at a central portion thereof with a predetermined distance in the axial direction.
An air chamber 44 whose peripheral wall is formed by the elastic film 43 is arranged between the portions 42 so as to divide the liquid chamber 37 into two portions 37a and 37b in the axial direction. The two parts 37a, 37b of the liquid chamber 37 are formed as independent closed spaces that do not communicate with each other, and not only the same liquid is enclosed in the two parts 37a, 37b, but also In some cases, another type of liquid having a different viscosity is enclosed.

The spiral orifices 41 and 42 are shown in FIG.
As shown in detail in FIG. 11, it comprises an outer hat member 46 and an inner hat member 47.
Reference numeral 7 denotes a shallow bottomed cylindrical portion 46a, 47a, and a flange portion 4 provided at the peripheral edge of the cylindrical portion 46a, 47a.
6b and 47b. The outer hat member 46 and the inner hat member 47 are superposed so as to be housed in the outer hat member 46, and the bottomed tubular portion 46a of the outer hat member 46 and the bottomed tubular portion of the inner hat member 47 are stacked. An annular passage 48 is formed in the circumferential direction between the portion 47a and the bottomed tubular portion 47a of the inner hat member 47 so as to be separated from the outer hat member 46. The annular passage 48 is closed at one position in the circumferential direction (see FIG. 11), and is formed on the bottomed cylindrical portion 46 a of the outer hat member 46 on one of both sides of the annular passage 48 sandwiching this closed place. The bottomed tubular portion 47 of the inner hat member 47 is passed through the communication passage 49.
Each of the spiral orifices 41, 42 is communicated with the outside of the spiral orifice 41, 42 through a communication hole 50 formed in a. Then, each of the spiral orifices 41, 42 has a communication hole 49,
Flow resistance is generated when the liquid flows through the annular passage 48 through 50. Here, the spiral orifices 41 and 42 are set to have different flow resistances during liquid flow, for example, by making the passage areas of the annular passages 48 different from each other.

Further, the elastic film 4 forming the air chamber 44.
3 is composed of two portions 43a and 43b each formed in a bowl shape with a central portion recessed. And the one part 43
a is the central concave portion of the one spiral orifice 41
The spiral orifice 4 is housed in the inner hat member 47 of
1 and their peripheral edges are, as shown in detail in FIG. 6, the hat member 4 of the spiral orifice 41.
In the state where the bottom surface side of 6, 47 is directed to the elastic body 34 side, the other end portion of the first cylindrical member 33 is caulked to make the cylindrical member 33.
It is fixed to. In addition, the other portion 43 of the elastic film 43
In b, the central concave portion is housed in the inner hat member 47 of the other spiral orifice 42 and is superposed on the spiral orifice 42. The elastic body 3
In the state facing the 6 side, the other end of the second cylindrical member 35 is caulked together with the caulking part (the other end) of the cylindrical member 33 and is fixed to the cylindrical member 35. Reinforcing rings 51 and 52 are embedded in the peripheral portions of the portions 43a and 43b of the elastic film 43, respectively.

In the second embodiment, as in the case of the first embodiment, when the low frequency vibration is input from the vibration generating member, the two parts 37a and 37b of the liquid chamber 37 are provided. The liquid flows in the liquid chamber 37, and the swirl orifice 4 in each of the portions 37a and 37b of the liquid chamber 37.
By generating flow resistance due to liquid column resonance with different cross-sectional areas and orifice lengths in 1 and 42, the damping effect can be effectively exhibited. When high frequency vibration is input, the entire peripheral wall of the liquid chamber 37 is covered with the elastic film 4.
When the volume of the air chamber 44 formed by 3 changes, the damping effect can be effectively exhibited. Therefore, the damping effect can be effectively exerted on the vibration in a wide range from the low frequency to the high frequency, and the vibration damping property can be effectively enhanced.

Further, when the two portions 37a and 37b of the liquid chamber 37 which are divided by the air chamber 44 are formed in independent closed spaces as in this embodiment, both portions 3 thereof are
By enclosing different types of liquids with different viscosities in 7a and 37b, two different resonance peaks can be given at different vibration frequencies in the low frequency region, and the damping effect can be exerted in peaks in both regions. Can play.

[0031]

As described above, according to the liquid-sealing anti-vibration supporting device of the present invention, low-frequency vibration is damped by the flow resistance of the liquid generated by the two baffles or orifices provided in the liquid chamber. In addition to being able to effectively exhibit the effect, with respect to high frequency vibration, the damping effect can be effectively exerted by the volume change of the air chamber in which the liquid chamber and the entire peripheral wall are defined by the elastic film. It has an excellent anti-vibration property.

In particular, according to the second aspect of the present invention, with respect to low frequency vibration, the flow resistance is caused when the liquid flows through the communication passage between the liquid chambers divided into two in the air chamber. Also, the damping effect can be exhibited, and the vibration damping property can be further enhanced.

According to the third aspect of the present invention, liquids having different viscosities are enclosed in the liquid chambers which are divided into two by the air chamber and are formed in independent closed spaces, respectively, so that the low frequency region The damping effect can be exerted in a peak shape at different vibration frequencies, and the vibration damping property can be enhanced over a wide vibration region.

Further, according to the invention described in claim 4, with respect to the low frequency vibration, the inertial mass of the fluid when the fluid flows between the sub-chamber and the liquid chamber outside thereof through the throttle portion. A damping effect can also be exhibited by resonance and flow resistance,
The anti-vibration property can be further enhanced.

[Brief description of drawings]

FIG. 1 is a vertical sectional view of a liquid-sealing vibration-damping support device according to a first embodiment of the present invention.

FIG. 2 is an enlarged cross-sectional view taken along the line AA of FIG.

FIG. 3 is a partial cross-sectional view showing a state before assembly of the elastic film.

FIG. 4 is a vertical sectional view of a right half of a center line showing a modified example of the liquid-sealing anti-vibration supporting device.

FIG. 5 is a view, corresponding to FIG. 1, showing a second embodiment of the present invention.

6 is a partially enlarged view of FIG.

FIG. 7 is a plan view of a spiral orifice.

8 is a cross-sectional view taken along the line CC of FIG.

9 is a cross-sectional view taken along the line DD of FIG.

10 is a cross-sectional view taken along the line EE of FIG.

11 is a cross-sectional view taken along the line FF of FIG.

[Explanation of symbols]

1 inner cylinder (vibration generation side member or vibration reception side member) 2 outer cylinder (vibration reception side member or vibration generation side member) 3,4 elastic body 5 liquid chamber 8,9 baffle plate 10 elastic film 11 air chamber 14 communication path 15, 23 Sub chambers 21, 22 Baffle plates 31, 32 Mounting member (vibration generation side member or vibration receiving side member) 34, 36 Elastic body 37 Liquid chamber 41, 42 Swirl orifice 43 Elastic film 44 Air chamber

Claims (4)

[Claims] 1. An elastic body is interposed between the vibration generating side member and the vibration receiving side member, and at least the elastic body forms a liquid chamber in which a liquid is sealed between the both members.
In the liquid chamber, two baffle plates or orifices that generate a flow resistance are provided at a predetermined distance in the axial direction, and the air whose peripheral wall is formed by an elastic film is provided between the two baffle plates or orifices. A liquid seal vibration isolating support device, wherein the chamber is arranged so as to divide the liquid chamber into two in the axial direction. 2. The liquid seal antivibration support device according to claim 1, wherein the liquid chambers divided into two by the air chamber are communicated with each other by a communication passage. 3. The liquid chamber divided into two by the air chamber,
The liquid-sealing anti-vibration supporting device according to claim 1, wherein the liquid-sealing anti-vibration supporting device is formed in independent closed spaces. 4. An elastic body is interposed between the vibration generating side member and the vibration receiving side member, and at least the elastic body forms a liquid chamber in which liquid is sealed between the both members.
In the liquid chamber, two baffle plates that generate flow resistance are provided at a predetermined distance in the axial direction, and an air chamber whose peripheral wall is formed of an elastic film is provided between the two baffle plates. Is divided into two in the axial direction, a sub-chamber is formed between the baffle plate and the elastic body or elastic film, and the sub-chamber and the liquid chamber outside the sub-chamber are formed. A liquid seal anti-vibration support device, characterized in that a throttle portion is formed to generate flow resistance when the liquid flows between them.