JPH05248482A - Liquid-sealed type mount - Google Patents

Abstract

PURPOSE:To prevent rise of a dynamic spring when an orifice is switched. CONSTITUTION:A main liquid chamber 3 surrounded with a resilient body 2 is formed on the upper surface side of a partition wall 1 and an auxiliary liquid chamber 5 surrounded with a diaphragm 4 is formed on the under surface side thereof. A large orifice 7 having the one end communicated to the main liquid chamber 3 and the other end communicated to the auxiliary liquid chamber 5 and a small orifice 10 having the one end communicated with the main liquid chamber 3 and the other end communicated with the large orifice 7, and an opening part 27 for intercommunicating the main and auxiliary liquid chambers 3 and 5 are formed in the partition wall 1. The opening part 27 is closed with a subdiaphragm 28. An on-off valve 12 is rotatably arranged to the partition wall 1 and a communicating state between the large orifice 7 and the main liquid chamber 3 and between the small orifice 10 and the main liquid chamber 3 and the opening part 27 are brought into an openable state. The section of the flow passage of a communicating part 20 between the main liquid chamber 3 and the large orifice 7 is kept at an initial value in the given rotation range of the on-off valve 12. Thereafter, the opening part 27 is gradually started to open following rotation of the on-off valve 12 and the communicating part 20 is gradually closed.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a mount for supporting a vibration body such as an automobile engine in a vibration-proof manner, and more particularly to a liquid-filled mount in which a liquid is filled.

[0002]

2. Description of the Related Art Generally, in a vibrating body such as an automobile engine, various vibrations having different frequencies and amplitudes are generated depending on the rotational state, that is, the number of revolutions. There is a strong demand for an anti-vibration device that can effectively damp the vibration of the.

As a vibration isolator for damping such a wide range of vibration, for example, the vibration isolator disclosed in Japanese Patent Application Laid-Open No. 2-46337 is already known. This vibration isolator has a fluid sealed inside. A fluid-filled type vibration damping device, in which a main fluid chamber surrounded by an elastic body is formed on the upper surface side of the partition wall, and a sub-fluid chamber surrounded by a diaphragm is formed on the lower surface side of the partition wall, and both fluids are formed. A non-compressible fluid such as water or oil is enclosed in the chamber, and further, the partition wall is provided with a small-diameter orifice and a large-diameter orifice that communicate between the main fluid chamber and the sub-fluid chamber. It is a thing.

The elastic body is fixed to the engine side, which is a vibrating body, and the diaphragm is fixed to the chassis side, which is a support body, so that various vibrations from the engine side are prevented from being transmitted to the chassis side. Is becoming

That is, when the engine speed is in the idling range, the rotary valve is operated to connect the main fluid chamber and the sub-fluid chamber via the large-diameter orifice, thereby vibrating in the idling range. If the engine speed is in the running range, the rotary valve is operated to switch from the large diameter orifice to the small diameter orifice.
By connecting the main fluid chamber and the sub-fluid chamber via a small-diameter orifice, shock vibrations and the like in the traveling range are damped.

However, in the conventional vibration isolator constructed as described above, when switching the communication state of the main fluid chamber and the sub fluid chamber from the large diameter orifice to the small diameter orifice, the large diameter orifice is used. Since the cross-section of the flow path of the communication part between the main liquid chamber and the main fluid chamber is gradually blocked following the rotation of the rotary valve, and when it is completely blocked, it switches to a small diameter orifice. , The orifice characteristics are a → b → c in Fig. 3.
→ As shown in d, the frequency changes in the order of decreasing frequency. Therefore, when the idle mode is suddenly accelerated to the shock mode, the dynamic spring rises sharply as shown by the broken line in the figure. However, there has been a problem that sound vibration is transmitted by the sudden rise of the dynamic spring.

Further, since only two orifices, a large diameter orifice and a small diameter orifice, are provided, it is impossible to reduce the dynamic spring in the high frequency range and the vibration is transmitted in the high frequency range. There were also points.

The present invention solves the above-mentioned problems of the prior art, and when switching the communication state between the main liquid chamber and the sub liquid chamber from the large diameter orifice to the small diameter orifice. It is possible to prevent the occurrence of sound vibration due to the sudden rise of the dynamic spring by suppressing the rapid rise of the dynamic spring, and to provide a liquid-filled mount that is excellent in damping of vibration in the high frequency range. It is what

[0009]

In order to solve the above problems, the present invention is directed to a main liquid chamber surrounded by an elastic body on the upper surface side of a partition wall and a sub liquid chamber surrounded by a diaphragm on the lower surface side. And a large diameter orifice having one end communicating with the main liquid chamber and the other end communicating with the sub liquid chamber,
A small-diameter orifice whose one end is in communication with the main liquid chamber and whose other end is in communication with the large-diameter orifice and whose flow passage cross section is smaller than that of the large-diameter orifice, and an opening which communicates between the main liquid chamber and the sub-liquid chamber. Is provided at a plurality of locations, the opening is closed by a sub-diaphragm, and an opening / closing valve is rotatably provided on the partition wall so that the small-diameter orifice and the small-diameter orifice are provided between the large-diameter orifice and the main liquid chamber. When opening and closing the main liquid chamber and the opening, and switching the communication state of the main liquid chamber and the sub liquid chamber from the large diameter orifice to the small diameter orifice by rotating the opening and closing valve, a predetermined opening and closing valve Within the range of rotation of, the flow passage cross section of the communication part between the large-diameter orifice and the main liquid chamber is maintained at the initial size, and when the opening / closing valve exceeds the predetermined range of rotation, the opening is opened. As it gradually begins to open, the flow path cross section of the communication part A means is adopted in which the communication part and the opening part are configured so that the large-diameter orifice is switched to the small-diameter orifice when the communication part is gradually closed and the communication part is completely closed. .. Further, the communication part is composed of an opening communicating with the large-diameter orifice provided in the partition wall, and an opening communicating with the main liquid chamber provided in the opening / closing valve having a larger flow passage cross section than the opening, When the on-off valve is rotated to a predetermined position, the central portion of the opening on the partition valve side is aligned with the opening on the partition wall side, and the large diameter orifice and the main orifice are connected through the matched portion. When communicating with the liquid chamber and then rotating the on-off valve to switch the communication state between both liquid chambers to the small diameter orifice, within the predetermined rotation range of the on-off valve, the main liquid chamber and the large diameter orifice While the flow passage cross section of the communication part of is kept at the initial size, the opening gradually starts to open, and the communication part gradually decreases the flow passage cross section, after which the opening is completely closed. When the communication part is completely closed by opening it, the communication between the main liquid chamber and the sub liquid chamber is large. To switch to the small diameter orifice from the orifice, the size of the opening of the opening and the closing valve of the large-diameter orifice, is obtained by employing the means of position is set.

[0010]

According to the present invention, by adopting the above-mentioned means, when the communication state between the main liquid chamber and the sub liquid chamber is switched from the large diameter orifice to the small diameter orifice by the rotation of the opening / closing valve, Within the predetermined rotation angle, the flow passage cross section of the communication portion between the large-diameter orifice and the main liquid chamber is maintained at the initial size. Then, when the on-off valve exceeds the predetermined rotation angle,
As the opening gradually begins to open, the flow passage cross section of the communicating portion gradually begins to decrease, and when the communicating portion is completely closed, the large diameter orifice is switched to the small diameter orifice. Also,
The upper surface side of the opening of the sub diaphragm contacts the liquid in the main liquid chamber, and the lower surface side of the sub diaphragm contacts the liquid in the sub liquid chamber. Therefore, the sudden increase of the dynamic spring when switching from the large diameter orifice to the small diameter orifice is eliminated, and the liquid column resonance of the large diameter orifice can be instantly weakened by opening the opening.

[0011]

Embodiments of the present invention shown in the drawings will be described below. 1 and 2 show an embodiment of a liquid-filled mount according to the present invention. FIG. 1 is a schematic vertical sectional view showing the whole of the mount, which is viewed along line XX in FIG. 2 is a partial cross-sectional view taken along the line YY of FIG.

That is, in the liquid-filled mount shown in this embodiment, the main liquid chamber 3 surrounded by the elastic body 2 is formed on the upper surface side of the partition wall 1, and the lower surface side of the partition wall 1 is surrounded by the diaphragm 4. A sub liquid chamber 5 is formed, and an incompressible liquid 6 such as water or oil is enclosed in both liquid chambers 3 and 5, and further,
The partition wall 1 has a large diameter orifice 7 having one end communicating with the main liquid chamber 3 through an opening 8 and the other end communicating with the sub liquid chamber 5 through a communication hole 9, and an opening 11 at one end. And a small diameter orifice 10 communicating with the main liquid chamber 3 via the other end and the other end communicating with one end of the large diameter orifice 7.
An opening 27 that penetrates the bottom surface of the partition wall 1 from the upper surface side to the lower surface side.
Are provided at a plurality of positions, the opening 27 is closed by a sub-diaphragm 28, and the opening / closing valve 12 is rotatably provided on the partition wall 1 so that the large diameter can be changed according to the turning position of the opening / closing valve 12. The opening 8 of the orifice 7 and the main liquid chamber 3 can be opened and closed, the opening 11 of the small diameter orifice 10 and the main liquid chamber 3 can be constantly opened, and the opening 27 can be opened and closed. It is configured to.

The partition wall 1 has a disk shape, and a recess 18 having a predetermined depth is formed in the central portion of the upper surface side.
The above-described fan-shaped openings 27 penetrating from the upper surface side to the lower surface side are evenly provided on the bottom surface of the concave portion 18 (three locations in this embodiment), and each opening portion 27 has a thin flat plate shape. The sub diaphragm 28 is closed.

The peripheral portion of the concave portion 18 has a concave portion 18
The large-diameter orifice 7 having a rectangular arc-shaped cross section with an open upper surface so as to surround the circle, and the cross-section having a smaller open cross-section than the large-diameter orifice 7 communicating with one end of the large-diameter orifice 7 is rectangular. A small-diameter orifice 10 having an arc shape is continuously bored.

One end of the small diameter orifice 10 communicates with the inside of the recess 18 through an opening 11 having a cross section larger than the flow path cross section of the small diameter orifice 10, and the large diameter orifice 7
One end of the large diameter orifice 7 communicates with the inside of the recess 18 through an opening 8 having a cross section larger than the flow passage cross section of the large diameter orifice 7, and the other end of the large diameter orifice 7 has a partition through an arcuate communication hole 9. 1, a lid member 21 is provided on the upper surface side of the partition wall 1, and by this lid member 21, the upper surface side opening portion of the large diameter orifice 7 and the upper surface side opening of the small diameter orifice 10 are provided. The part is designed to be closed.

The on-off valve 12 has a cylindrical side wall 13,
A disk-shaped bottom plate 14 that closes the lower end opening of the side wall 13 and has an opening 29 penetrating from the upper surface side to the lower surface side in a fan shape at the same interval as the opening 27 of the partition wall 1. The bottom plate 14 is formed integrally with a central portion of the lower surface of the bottom plate 14 and has a rod-shaped protrusion 15 protruding downward in the drawing. In this case, the side wall 13 is a recess 18 of the partition wall 1.
The side wall 13 is sized so as to be rotatably fitted therein, and penetrates through the inside and outside of the side wall 13 having a cross section larger than the opening 8 of the large diameter orifice 7 at an appropriate position of the side wall 13. And an opening 17 penetrating the inside and outside of the side wall 13 having a length (cross section) about 5 times that of the opening 11 of the small-diameter orifice 10.

The positional relationship between the openings 16 and 17 is such that the opening 8 of the large-diameter orifice 7 on the partition 1 side overlaps with the center of the opening 16 of the large-diameter orifice 7 on the opening / closing valve 12 side. The opening 11 of the small-diameter orifice 10 on the first side has a positional relationship such that the front end portion in the rotational direction of the opening 11 of the small-diameter orifice 10 on the opening / closing valve 12 side matches so that the flow passage cross section is secured. There is.

The diaphragm 4 has a disk shape, and its peripheral portion is clamped and fixed between the peripheral portion of the lower surface of the partition wall 1 and the peripheral portion of the bowl-shaped lower case 22. The sub liquid chamber 5 in which the liquid 6 is enclosed is formed between the sub liquid chamber 5 and the lower surface of the partition wall 1.

The on-off valve 12 is rotatably fitted in the recess 18 of the partition wall 1. In this case, the on-off valve 1
The second projecting portion 15 penetrates the partition wall 1 and projects to the lower surface side of the partition wall 1. This projecting projecting portion 15 is of a drive source 24 such as a pulse motor attached to the central portion of the lower case 22. It is adapted to be connected to the drive shaft 24a.

Reference numeral 25 is a bearing that rotatably supports the on-off valve 12.

A lower end portion of a cylindrical upper case 23 is caulked to the outer peripheral surface of the partition wall 1, and a boss portion 26 is provided inside the upper end portion of the upper case 23 at a predetermined interval. Is located, and the boss portion 26 and the upper end portion of the upper case 23 are integrally connected by an elastic body 2, and the elastic body 2 encloses a liquid 6 on the upper surface side of the partition wall 1 to form a main liquid chamber 3 Are formed.

Then, as described above, the main liquid chamber 3 surrounded by the elastic body 2 is provided on the upper surface side of the partition wall 1, and the diaphragm 4 is provided on the lower surface side.
By forming the sub liquid chamber 5 surrounded by, the two liquid chambers 3 and 5 are communicated with each other through the large diameter orifice 7 or the small diameter orifice 10 provided in the partition wall 1.

Next, the operation of the above will be described. First, the boss portion 26 is connected to an unillustrated engine side which is a vibrating body, and the lower case 22 is connected to an unillustrated chassis side which is a support body to start the engine.

When the rotation of the engine is in the idling range, the opening / closing valve 12 is operated by the operation of the drive source 24 to open the opening 1 of the large diameter orifice 7 of the opening / closing valve 12.
The opening 8 of the large-diameter orifice 7 of the partition wall 1 is superposed on the central portion of the partition 6, and the main liquid chamber 3 and the large-diameter orifice 7 are communicated with each other through the superposed openings 8 and 16. The main liquid chamber 3 and the sub liquid chamber 5 communicate with each other through the large diameter orifice 7.

When the vibration of the engine is input to the elastic body 2 through the boss portion 26, the vibration causes the elastic body 2 to move.
Is displaced downward in the drawing, the volume of the main liquid chamber 3 is narrowed, the liquid 6 in the main liquid chamber 3 flows into the large-diameter orifice 7, and flows in the large-diameter orifice 7 to cause the sub-liquid chamber 5 to flow. It moves to the side and is combined with the liquid 6 in the sub liquid chamber 5 to increase the volume of the sub liquid chamber 5, so that the diaphragm 4 located below the sub liquid chamber 5 is displaced downward in the drawing.

Then, due to the restoring force of the diaphragm 4,
The volume of the sub liquid chamber 5 is narrowed, the liquid 6 in the sub liquid chamber 5 flows into the large diameter orifice 7, flows in the large diameter orifice 7 and moves to the main liquid chamber 3 side, and then inside the main liquid chamber 3. Combined with the liquid 6 of FIG. 3 increases the volume of the main liquid chamber 3.

Due to the flow resistance when the liquid 6 moves between the main liquid chamber 3 and the sub liquid chamber 5 through the large-diameter orifice 7, the vibration input from the engine can be attenuated. Become.

In this case, the small-diameter orifice 1 on the side of the partition wall 1
The opening 11 of 0 is a small diameter orifice 10 on the side of the on-off valve 12.
Since the opening 17 of the small diameter orifice 10 and the main liquid chamber 3 are in communication with each other through the openings 11 and 17, the small diameter orifice 1 is in communication with the small diameter orifice 1.
Since the opening portions 11 and 17 on the 0 side have a higher pressure than the opening portions 8 and 16 on the large diameter orifice 7 side, the small diameter orifice 1
The liquid 6 does not flow into the small diameter orifice 10 through the 0-side openings 11 and 17, and most of the liquid 6 flows into the large-diameter orifice 7 through the large-diameter orifice 7-side openings 8 and 16. I will be depressed.

Next, when the rotation of the engine is in the traveling range, the opening / closing valve 12 is rotated by the operation of the drive source 24 to increase the communication state between the main liquid chamber 3 and the sub liquid chamber 5. The small diameter orifice 7 is switched to the small diameter orifice 10, and the main liquid chamber 3 and the sub liquid chamber 5 are communicated with each other via the small diameter orifice 10.

Then, as in the case of the large diameter orifice 7 described above, the flow resistance when the liquid 6 moves between the main liquid chamber 3 and the sub liquid chamber 5 through the small diameter orifice 10 causes It is possible to damp shock vibrations and the like in the traveling range.

In this case, the opening 8 of the large-diameter orifice 7 on the partition wall 1 side overlaps with the center of the opening 16 on the opening / closing valve 12 side from the position where the opening / closing valve 12 starts to rotate to a predetermined rotation angle. Since the state is in the state, the main liquid chamber 3 and the large-diameter orifice are kept until the rear end in the rotation direction of the opening 16 on the opening / closing valve 12 side passes the rear end in the rotation direction of the opening 8 on the partition wall 1 side. The flow passage cross section of the communication portion 20 between the first and second portions is kept at the initial size.

Then, when the opening / closing valve 12 exceeds a predetermined rotation angle, the flow passage cross section of the communicating portion 20 begins to gradually decrease, and the opening 27 begins to gradually open, after which the communicating portion 20. Is completely closed, the opening 27
Is completely opened, and the upper surface side of the sub diaphragm 28 of the opening 27 comes into contact with the liquid in the main liquid chamber 3, and the lower surface side of the sub diaphragm 28 comes into contact with the liquid in the sub liquid chamber 5. Then, after this, the large diameter orifice 7 is switched to the small diameter orifice 10.

Therefore, it is possible to prevent the dynamic spring from suddenly rising when switching from the large diameter orifice 7 to the small diameter orifice 10, and open the opening 27 at the moment when switching to the small diameter orifice 10 to open the sub diaphragm 28 of the opening 27. The large-diameter orifice 7 to the small-diameter orifice 10 are brought into contact with the liquid in the main and sub-liquid chambers 3 and 5.
The liquid column resonance of the large-diameter orifice 7 can be weakened at the moment of switching to, so that the sudden rise of the dynamic spring in the high frequency range can be completely prevented.

As described above, in the vibration isolator according to this embodiment, when the communication state between the main liquid chamber 3 and the sub liquid chamber 5 is switched from the large diameter orifice 7 to the small diameter orifice 10, a large diameter orifice is used. The flow passage cross section of the communication portion 20 between the orifice 7 and the main liquid chamber 3 is maintained at an initial size within a predetermined rotation range of the opening / closing valve 12, and when the opening / closing valve 12 exceeds a predetermined rotation angle, the communication portion is formed. As the flow passage cross section of 20 gradually decreases, the opening 27 gradually opens, and when the communication portion 20 is completely closed, the opening 27 is completely opened and the large diameter orifice 7 has a small diameter. By switching to the orifice 10, even when the idle mode is suddenly accelerated to the shock mode, the dynamic spring is gradually raised to a predetermined frequency along the idle mode, and at the same time as the frequency is high. It will be able to shift gradually to, therefore, since it eliminates the dynamic spring during switching increases rapidly, so that the generation of noise vibrations due to a rapid increase in the dynamic spring can be completely prevented.

When the orifice is switched, the opening 27 is opened to bring the sub diaphragm 28 into contact with the liquid in the main and sub liquid chambers 3 and 5, so that the large diameter orifice 7 is switched to the small diameter orifice 10. Moreover, the liquid column resonance of the large-diameter orifice 7 can be instantly weakened, so that the rise of the dynamic spring in the high frequency range can be prevented, and the damping property against the vibration in the high frequency range can be enhanced. Become.

[0036]

As described above, according to the present invention, after the main liquid chamber and the sub liquid chamber are communicated with each other through the large diameter orifice, the rotary valve is operated so that the two liquid chambers are communicated with each other through the large diameter orifice. When switching to a small diameter orifice, the flow passage cross section of the communication part between the large diameter orifice and the main liquid chamber was kept constant within the predetermined rotation range of the opening / closing valve, and then the opening / closing valve exceeded the predetermined rotation angle. At that point, the opening gradually begins to open, and the flow passage cross section of the communicating part gradually decreases, and at the moment when the communicating part is completely closed, the opening is completely opened and the large-diameter orifice is switched to the small-diameter orifice. By doing so, it is possible to suppress a sudden rise of the dynamic spring when switching the communication state between the main liquid chamber and the sub liquid chamber from the large diameter orifice to the small diameter orifice, and also to increase the large diameter when switching. Instantaneous resonance of liquid column in orifice Therefore, even if the idle mode suddenly accelerates to the shock mode, the dynamic spring will not rise suddenly, and the sound vibration when switching can be completely prevented. become. Further, since the dynamic spring can be reduced in the high frequency range, it has an excellent effect such that the damping property against the vibration in the high frequency range can be enhanced.

[Brief description of drawings]

FIG. 1 is a schematic vertical cross-sectional view showing an embodiment of a liquid-filled mount according to the present invention and is a cross-sectional view taken along line XX of FIG.

FIG. 2 is a partial cross-sectional view of what is shown in FIG. 1 taken along line YY.

FIG. 3 is an explanatory diagram showing a conventional orifice characteristic.

[Explanation of symbols]

 1 ... Partition 2 ... Rubber-like elastic body 3 ... Main liquid chamber 4 ... Diaphragm 5 ... Sub liquid chamber 6 ... Liquid 7 ... Large diameter orifice 8, 11, 16, 17, 27, 29 ...... Opening 9 ...... Communication hole 10 ...... Small diameter orifice 12 ...... Opening / closing valve 13 ...... Side wall 14 ...... Bottom plate 15 ...... Projection part 18 ...... Concave part 20 ...... Communication part 21 ...... Lid member 22 ...... Lower case 23 ...... Upper case 24 ...... Drive source 24a ...... Drive shaft 25 ...... Bearing 26 ...... Boss 28 ...... Sub diaphragm

Claims (2)

[Claims] 1. A main liquid chamber (3) surrounded by an elastic body (2) is provided on the upper surface side of the partition (1), and a sub liquid chamber (5) surrounded by a diaphragm (4) is provided on the lower surface side. At the same time, the partition wall (1) has a large-diameter orifice (7) having one end communicating with the main liquid chamber (3) and the other end communicating with the sub liquid chamber (5), and one end having the main liquid chamber (3). A small-diameter orifice (10) having a smaller flow passage cross section than the large-diameter orifice (7) communicating with the large-diameter orifice (7) at the other end, and the main liquid chamber (3) and the sub liquid chamber (5). ) And the opening (2
7) is provided at a plurality of locations, the opening (27) is closed by a sub-diaphragm (28), and an opening / closing valve (12) is rotatably provided on the partition wall (1) to provide the large diameter orifice. (7) and the main liquid chamber (3), between the small diameter orifice (10) and the main liquid chamber (3), and the opening (27) can be opened and closed, and the on-off valve (12) When the communication state of the main liquid chamber (3) and the auxiliary liquid chamber (5) is switched from the large diameter orifice (7) to the small diameter orifice (10) by the rotation of (1), a predetermined rotation of the opening / closing valve (12). Within the range, a communication part (20) between the large diameter orifice (7) and the main liquid chamber (3)
The flow passage cross section of the
When 2) exceeds the predetermined rotation range, the opening (2
7) begins to open gradually, and the communication part (20)
The cross section of the passage is gradually blocked, and when the communicating portion (20) is completely blocked, the communicating portion (7) is switched from the large diameter orifice (7) to the small diameter orifice (10). Two
0) and the opening (27). 2. The communication part (20) comprises the partition wall (1).
To an opening (8) communicating with the large diameter orifice (7) provided in the opening, and to the main liquid chamber (3) provided in the opening / closing valve (12) having a larger flow passage cross section than the opening (8). An opening (16) and an opening (8) on the side of the partition (1) when the on-off valve (12) is rotated to a predetermined position.
The central portion of the opening portion (16) on the side of the on-off valve (12) coincides with the large diameter orifice (7) and the main liquid chamber (3) communicate with each other through the coincident portion. After that, when the on-off valve (12) is rotated to switch the communication state between the liquid chambers (3) and (5) to the small diameter orifice (10), the on-off valve (1)
Within the predetermined rotation range of 2), the opening (27) is maintained while the flow passage cross section of the communicating portion (20) between the main liquid chamber (3) and the large diameter orifice (7) is kept at the initial size. Gradually begins to open, and the communication part (20) gradually reduces the cross section of the flow path, after which the opening part (27) is completely opened and the communication part (20) is completely closed. At this point, the main liquid chamber (3)
The opening (8) of the large-diameter orifice (7) and the opening / closing valve (12) so that the communication state between the large-diameter orifice (7) and the small-diameter orifice (7) is switched to the communication state between the large-diameter orifice (7) and the sub-liquid chamber (5). 2. The liquid-filled mount according to claim 1, wherein the size and position of the opening (16) of the mount are set.