JPH05248483A - Liquid-sealed type mount - Google Patents

Abstract

PURPOSE:To provide a low dynamic spring in a wide range. 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 thereof. A large orifice having the one end communicated to the main liquid chamber 3 and the other end communicated with the auxiliary liquid chamber 5, a small orifice 10 having the one end communicated, with the main liquid chamber and the other end communicated with a large orifice 7, and a middle orifice 27 having the one end communicated to the other end of the large orifice 7 and the other end communicated with the main liquid chamber 3 are formed in the partition wall 1. Further, an on-off valve 12 to open and close a communicating state between the large orifice 7 and the main liquid chamber 3, between the small orifice 10 and the main liquid chamber 3, and between the middle orifice 27 and the main liquid chamber 3 is rotatably arranged to the partition wall 1. The main liquid chamber 3 and the auxiliary liquid chamber 5 are intercommunicated through the large orifice 7, the middle orifice 27, and the small orifice 10 according to the rotation position of the on-off valve 12.

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.

By fixing the elastic body to the engine side, which is a vibrating body, and the diaphragm to the chassis side, which is a supporting body, it is possible to prevent various vibrations from the engine side 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 the communication state between the main fluid chamber and the sub fluid chamber is switched from the large diameter orifice to the small diameter orifice, that is, from the idle mode. When switching to the shock mode, as shown in FIG. 4, the dynamic spring rises sharply at a certain frequency, so switching should be performed so that there is no response delay when switching from the large diameter orifice to the small diameter orifice. Is required. However, since a response delay is inevitable when switching, the dynamic spring once rises and then switches to the shock mode (small-diameter orifice), which reduces the damping of the generated vibration. There was a problem.

The present invention has solved the above-mentioned problems of the conventional ones, 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 an object of the present invention to provide a liquid-filled mount capable of enhancing damping of generated vibration by eliminating abrupt rise of a dynamic spring.

[0008]

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,
And one end communicating with the main liquid chamber and the other end communicating with the large diameter orifice, a small diameter orifice having a smaller flow passage cross section than the large diameter orifice, and one end communicating with the other end of the large diameter orifice, and the other end. Has a flow passage cross section that is substantially the same as the large-diameter orifice communicating with the main liquid chamber, and is provided with a medium-diameter orifice having a shorter length than the large-diameter orifice,
An opening / closing valve is rotatably provided on the partition wall to connect the large diameter orifice and the main liquid chamber, the small diameter orifice and the main liquid chamber, and the medium diameter orifice and the main liquid chamber. It is possible to open and close the space, and depending on the turning position of the on-off valve,
The main liquid chamber and the sub liquid chamber are configured to communicate with each other via the large diameter orifice, the medium diameter orifice, or the small diameter orifice.

[0009]

According to the present invention, by adopting the above-mentioned means, a large-diameter orifice, a medium-diameter orifice, or a small-diameter orifice is provided between the main liquid chamber and the auxiliary liquid chamber depending on the turning position of the on-off valve. Since it is connected via the medium diameter orifice when switching from the large diameter orifice to the small diameter orifice, the dynamic spring does not suddenly rise at the time of switching. ..

[0010]

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 the opening 8 and the other end communicating with the auxiliary liquid chamber 5 through the communication hole 9, and one end through the opening 11. The small-diameter orifice 10 that communicates with the main liquid chamber 3 and the other end communicates with one end of the large-diameter orifice 7, and one end communicates with the other end of the large-diameter orifice 7, and the other end has the main liquid. A medium-diameter orifice 27 communicating with the chamber 3 is provided, and the partition wall 1 is further provided.
An open / close valve 12 is rotatably provided in the main-liquid chamber 3 and between the opening 8 of the large-diameter orifice 7 and the main liquid chamber 3, and the medium-diameter orifice 27 and the The small diameter orifice 1 can be opened and closed with the main liquid chamber 3.
The opening 11 and the main liquid chamber 3 are always open.

The partition wall 1 has a disk shape, and a recess 18 having a predetermined depth is formed in the central portion on the upper surface side.
At the peripheral edge of the recess 18, a large-diameter orifice 7 whose upper surface side is open so as to surround the recess 18 and has a square arc shape, and a cross-section whose upper surface side is continuous with the large-diameter orifice 7 are rectangular. It has a circular arc shape, has the same flow passage cross section as the large diameter orifice 7, and is connected to one end of the large diameter orifice 7 and a medium diameter orifice 27 having a shorter length than the large diameter orifice 7. A small-diameter orifice 10 having a rectangular cross-section with a square cross-section whose upper surface side is smaller than that of the large-diameter orifice 7 is continuously formed.

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 passage cross section of the small diameter orifice 10.
Has one end communicating with the inside of the recess 18 through an opening 8 having a cross section larger than the cross section of the large diameter orifice 7, and one end of the medium diameter orifice 27 has a cross section larger than the cross section of the medium diameter orifice 27. Communicating with the inside of the recess 18 through the opening 28, and the other end of the large-diameter orifice 7 opens to the lower surface side of the partition wall 1 through the arcuate communication hole 9 and further to the upper surface side of the partition wall 1. A lid member 21 is provided on the upper side of the large diameter orifice 7, the upper side opening of the medium diameter orifice 27, and the upper side opening of the small diameter orifice 10, respectively. It is supposed to be blocked.

The on-off valve 12 has a cylindrical side wall 13,
A disc-shaped bottom plate 14 that closes the lower end opening of the side wall 13.
And a bar-shaped projecting portion 15 projecting downward in the drawing, which is integrally provided in the central portion of the lower surface of the bottom plate 14, and in this case, the side wall 13 is rotatable in the recess 18 of the partition wall 1. The opening 16 that penetrates the inside and outside of the side wall 13 that is slightly larger than the opening 8 of the large-diameter orifice 7 and that is formed at a suitable position of the side wall 13, Opening 28 of diameter orifice 27
An opening 29 having substantially the same size as that of the small diameter orifice 10 and an opening 17 penetrating the inside and outside of the side wall 13 having a length (size) about 5 times that of the opening 11 of the small-diameter orifice 10 are provided.

The positions of the openings 16, 17, 29 are large on the partition wall 1 side so that the flow passage cross section is secured in the central portion of the opening 16 of the large-diameter orifice 7 on the opening / closing valve 12 side. With the opening 8 of the small-diameter orifice 7 positioned, the opening 11 of the small-diameter orifice 10 on the opening / closing valve 12 side is secured so that the flow passage cross section is secured in the opening 11 of the small-diameter orifice 10 on the partition wall 1 side. Of the medium diameter orifice 27 on the partition wall 1 side is closed, and the opening 27 of the medium diameter orifice 27 of the on-off valve 12 is the opening of the large diameter orifice 7. It is located on the side of the section 8.

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 opening / closing valve 12 is rotatably fitted in the recess 18 of the partition wall 1. In this case, the opening / closing valve 1 is
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, the medium diameter orifice 27, or the small diameter orifice 10 provided in the partition wall 1. ing.

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 region, the opening / closing valve 12 is operated by the operation of the drive source 24, and the opening 1 of the large-diameter orifice 7 of the opening / closing valve 12 is operated.
6 is aligned with the opening 8 of the large-diameter orifice 7 of the partition wall 1 so that the flow passage cross section is secured, and both openings 8, 16 are formed.
Through the main liquid chamber 3 and the large-diameter orifice 7,
The main liquid chamber 3 and the sub liquid chamber 5 communicate with each other through the large diameter orifice 7.

When the engine vibration 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 via 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 partition wall 1 side
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, the opening / closing valve 12 is rotated by the operation of the drive source to close the opening 8 of the large-diameter orifice 7, and the opening 29 of the medium-diameter orifice 27 of the opening / closing valve 12 is opened in the partition 1. Match the opening 28 of the radial orifice 27,
The main liquid chamber 3 and the sub liquid chamber 5 are communicated with each other through the medium diameter orifice 27, and the main liquid chamber 3 is connected through this medium diameter orifice lf 27.
By moving the liquid between the sub-liquid chamber 5 and the sub-liquid chamber 5, it is possible to damp vibrations in a region having a slightly higher frequency than when the large-diameter orifice 7 is used.

Next, when the engine speed exceeds the idling range and enters the running range, the opening / closing valve 12 is rotated by the operation of the drive source 24 to close the opening 28 of the medium diameter orifice 27. , The main liquid chamber 3 and the sub liquid chamber 5 are communicated with each other through the small diameter orifice 10, and the main liquid is passed through the small diameter orifice 10 as in the case of the large diameter orifice 7 or the medium diameter orifice 27. Due to the flow resistance when the liquid 6 moves between the chamber 3 and the sub liquid chamber 5, shock vibration and the like in this frequency range can be damped.

The orifice characteristics in these cases are such that 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 via the medium diameter orifice 27. Like A → B → C of
Since the dynamic spring can be set low in all frequency ranges, it is possible to exhibit excellent damping properties against vibrations in a wide range from low frequency to high frequency.

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, By switching from the orifice 7 to the small diameter orifice 10 via the medium diameter orifice 27, the dynamic spring can be set low in the idling region to the traveling region, that is, in a wide range from low frequency to high frequency.

[0031]

As described above, according to the present invention, when the large-diameter orifice is switched to the small-diameter orifice between the main liquid chamber and the sub-liquid chamber, the large-diameter orifice is switched to the small-diameter orifice via the medium-diameter orifice. By doing so, there is no sudden rise of the dynamic spring when switching, and it is possible to set the dynamic spring low in a wide range from low frequency to high frequency, so it is possible to reduce vibration in a wide range from the idling range to the running range. On the other hand, it has an excellent effect such as being able to exhibit an excellent damping property.

[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 the orifice characteristics of the one shown in FIG.

FIG. 4 is an explanatory diagram showing conventional orifice characteristics.

[Explanation of symbols]

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

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[Procedure amendment]

[Submission date] November 19, 1992

[Procedure Amendment 1]

[Document name to be amended] Statement

[Name of item to be amended] Claims

[Correction method] Change

[Correction content]

[Claims]

[Procedure Amendment 2]

[Document name to be amended] Statement

[Name of item to be corrected] 0002

[Correction method] Change

[Correction content]

[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 capable of effectively isolating the vibration of the.

[Procedure 3]

[Document name to be amended] Statement

[Name of item to be corrected] 0003

[Correction method] Change

[Correction content]

As a vibration isolation device for isolating such a wide range of vibrations, for example, a vibration isolation device disclosed in Japanese Patent Application Laid-Open No. 2-46337 is already known, and this vibration isolation device has a fluid sealed inside. And 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. A fluid chamber is filled with an incompressible fluid such as water or oil, and 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 was done.

[Procedure amendment 4]

[Document name to be amended] Statement

[Correction target item name] 0005

[Correction method] Change

[Correction content]

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. image stabilization and also when the rotational speed of the engine is in the running range, switching actuates the rotary valve from the orifice of the large diameter to the small diameter of the 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.

[Procedure Amendment 5]

[Document name to be amended] Statement

[Correction target item name] 0006

[Correction method] Change

[Correction content]

However, in the conventional vibration isolator constructed as described above, when the communication state between the main fluid chamber and the sub fluid chamber is switched from the large diameter orifice to the small diameter orifice, that is, from the idle mode. When switching to the shock mode , the frequency is changed as shown in a → b → c → d in FIG.
The speed changes from lower to higher and suddenly accelerates from idle mode.
If the shock mode occurs, the dynamic spring may
Since it rapidly rises as shown by the line, when switching from the large diameter orifice to the small diameter orifice, it is necessary to switch so as not to cause a response delay. However, when switching, there will be a delay in response, so
The question that the dynamic spring suddenly rises and the sound vibration is transmitted.
There was a subject.

[Procedure correction 6]

[Document name to be amended] Statement

[Correction target item name] 0007

[Correction method] Change

[Correction content]

The present invention has solved the above-mentioned problems of the conventional ones, 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 an object of the present invention to provide a liquid-filled mount that can improve the vibration isolation property against the generated vibration by eliminating the sudden rise of the dynamic spring.

[Procedure Amendment 7]

[Document name to be amended] Statement

[Correction target item name] 0008

[Correction method] Change

[Correction content]

[0008]

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,
And one end communicating with the main liquid chamber and the other end communicating with the large diameter orifice, a small diameter orifice having a smaller flow passage cross section than the large diameter orifice, and one end communicating with the other end of the large diameter orifice, and the other end. Has the same flow passage cross section as the large-diameter orifice communicating with the main liquid chamber and has three orifices of medium-diameter orifice having a shorter length than the large-diameter orifice.
An opening / closing valve is rotatably provided on the partition wall so that the space between the small diameter orifice and the main liquid chamber is always open.
Between the large diameter orifice and the main liquid chamber, and
It is possible to open and close between the medium diameter orifice and the main liquid chamber.
And, depending on the rotational position of the on-off valve, wherein the between the main liquid chamber and the auxiliary liquid chamber diameter orifice, said in diameter orifice
Consists of a series of orifices configured to open and close through
The means to adopt is adopted.

[Procedure Amendment 8]

[Document name to be amended] Statement

[Correction target item name] 0009

[Correction method] Change

[Correction content]

[0009]

In the present invention, by adopting the above-mentioned means, a small diameter orifice is provided between the main liquid chamber and the sub liquid chamber.
It is always open, and depending on the turning position of the on-off valve, a large-diameter orifice or medium-diameter orifice is provided between the main liquid chamber and the auxiliary liquid chamber.
Since it will be communicated through the Liffith and will be switched through the medium diameter orifice when switching from the large diameter orifice to the small diameter orifice, the dynamic spring will not rise suddenly at the time of switching. become.

[Procedure Amendment 9]

[Document name to be amended] Statement

[Correction target item name] 0012

[Correction method] Change

[Correction content]

The partition wall 1 has a disk shape, and a recess 18 having a predetermined depth is formed in the central portion on the upper surface side.
At the peripheral edge of the recess 18, a large-diameter orifice 7 whose upper surface side is open so as to surround the recess 18 and has a square arc shape, and a cross-section whose upper surface side is continuous with the large-diameter orifice 7 are rectangular. It has a circular arc shape, has the same flow passage cross section as the large diameter orifice 7, and is connected to one end of the large diameter orifice 7 and a medium diameter orifice 27 having a shorter length than the large diameter orifice 7. A small-diameter orifice 10 having a rectangular cross-section whose upper surface side is smaller than that of the large-diameter orifice 7 and which is open on the upper surface side is continuous to form a series of orientations.
It is drilled as a fiss .

[Procedure Amendment 10]

[Document name to be amended] Statement

[Correction target item name] 0015

[Correction method] Change

[Correction content]

The positions of the openings 16, 17, 29 are large on the partition wall 1 side so that the flow passage cross section is secured in the central portion of the opening 16 of the large-diameter orifice 7 on the opening / closing valve 12 side. With the opening 8 of the small-diameter orifice 7 positioned, the opening 17 of the small-diameter orifice 10 on the opening / closing valve 12 side is secured so that the flow passage cross section is secured in the opening 11 of the small-diameter orifice 10 on the partition wall 1 side. The front ends of the medium-diameter orifices 27 in the direction of rotation coincide with each other, and at this time, the opening 28 of the medium-diameter orifice 27 on the partition wall 1 side is closed, and the opening 29 of the medium-diameter orifice 27 of the on-off valve 12 opens the large-diameter orifice 7. It is located on the side of the section 8.

[Procedure Amendment 11]

[Document name to be amended] Statement

[Name of item to be corrected] 0025

[Correction method] Change

[Correction content]

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 can prevent the vibration input from the engine. become.

[Procedure Amendment 12]

[Document name to be amended] Statement

[Name of item to be corrected] 0027

[Correction method] Change

[Correction content]

Next, the opening / closing valve 12 is rotated by the operation of the drive source so that the flow passage cross section of the opening 8 of the large diameter orifice 7 becomes small.
Together comprising fence, the opening 29 of the medium-diameter orifice 27 of the opening and closing valve 12 is medium-diameter orifice 27 of the partition wall 1 the opening 28
Passes through, communicates between the main liquid chamber 3 and the auxiliary liquid chamber 5 through the large diameter orifice 7 and intermediate diameter orifice 27, the large-diameter cage
By moving the liquid between the main liquid chamber 3 and the sub liquid chamber 5 via the fissure 7 and the medium diameter orifice 27 , the moving spring is suddenly raised as compared with the case where only the large diameter orifice 7 is used.
By eliminating the rise, the generated vibration can be isolated .

[Procedure Amendment 13]

[Document name to be amended] Statement

[Name of item to be corrected] 0029

[Correction method] Change

[Correction content]

The orifice characteristics in these cases are such that 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 via the medium diameter orifice 27 . Like A → B → C → D
Gradually shifts to higher frequencies, and
Sudden acceleration from idle mode (A) to shock mode
Even in the case of (D), the moving spring is indicated by the arrow in the figure.
It will rise gradually like.

[Procedure Amendment 14]

[Document name to be amended] Statement

[Name of item to be corrected] 0030

[Correction method] Change

[Correction content]

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, It passes through the medium-diameter orifice 27 through the orifice 7
By switching to the small diameter orifice 10 by using the small diameter orifice 10, it is possible to prevent a sudden rise of the dynamic spring.
Therefore, the generation of sound vibration can be completely prevented.

[Procedure Amendment 15]

[Document name to be amended] Statement

[Correction target item name] 0031

[Correction method] Change

[Correction content]

[0031]

As described above, according to the present invention, when switching between the large-diameter orifice and the small-diameter orifice between the main liquid chamber and the sub-liquid chamber, the large-diameter orifice passes through the medium-diameter orifice.
By switching to a small diameter orifice,
Suddenly accelerates from idle mode to shock mode
Even in such a case, the dynamic spring should not rise suddenly.
Completely prevents the generation of noise and vibration when switching.
This will allow you to drive comfortably
It has an excellent effect such as that.

[Procedure 16]

[Document name to be corrected] Drawing

[Name of item to be corrected] Figure 2

[Correction method] Change

[Correction content]

[Fig. 2]

[Procedure Amendment 17]

[Document name to be corrected] Drawing

[Name of item to be corrected] Figure 3

[Correction method] Change

[Correction content]

[Figure 3]

[Procedure 18]

[Document name to be corrected] Drawing

[Name of item to be corrected] Fig. 4

[Correction method] Change

[Correction content]

[Figure 4]

Claims (1)

[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. In addition, one end of the partition wall (1) communicates with the main liquid chamber (3) and the other end communicates with the sub liquid chamber (5), and a large diameter orifice (7), and one end of the main liquid chamber (3). ) And 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 other end of the large diameter orifice (7) at one end. Medium-diameter orifice (27) having a flow passage cross section that is substantially the same as the large-diameter orifice (7) communicating with the main liquid chamber (3) and the other end communicating with the main liquid chamber (3). ) Is further provided, and an opening / closing valve (12) is rotatably provided on the partition wall (1) so that Between the fis (7) and the main liquid chamber (3), between the small diameter orifice (10) and the main liquid chamber (3), and between the medium diameter orifice (27) and the main liquid chamber (3). Between the main liquid chamber (3) and the sub liquid chamber (5) according to the rotational position of the on-off valve (12), the large diameter orifice (7), Diameter orifice (27) or said small diameter orifice (10)
A liquid-filled mount characterized in that it is configured to communicate with each other through.