JP2015059654A - Vibration-proof device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To exert attenuation characteristic to vibration of wide frequency.SOLUTION: A vibration-proof device is provided with a cylindrical first mounting member 11 and a second mounting member 12, an elastic body 13 connecting both mounting members, a partitioning member 17 fitted in the first mounting member 11 and defining a main liquid chamber 14 applying the elastic body 13 as a part of a wall surface, and a sub-liquid chamber 15 and an intermediate chamber 16 disposed independently from the main liquid chamber 14, and an elastic film 19 configuring a part of a wall surface of the intermediate chamber 16. The partitioning member 17 is provided with a first limiting passage 31 communicating the main liquid chamber 14 and the sub-liquid chamber 15, a second limiting passage 33 extending from the main liquid chamber 14 toward the intermediate chamber 16, and having circulation resistance lower than that of the first limiting passage 31, and a movable body 35 disposed between the second limiting passage 33 and the intermediate chamber 16. An adjustment chamber 24 of which the inside can be decompressed or compressed with respect to a standard pressure, and is closably opened to the outside, is disposed in adjacent to the intermediate chamber 16 through the elastic film 19.

Description

  The present invention relates to a vibration isolator that is applied to, for example, automobiles and industrial machines and absorbs and attenuates vibrations of a vibration generating unit such as an engine.

  Conventionally, for example, a vibration isolator described in Patent Document 1 below is known. The vibration isolator includes a cylindrical first mounting member connected to one of the vibration generating unit and the vibration receiving unit, a second mounting member connected to the other, and an elastic connecting the both mounting members. A body, a main liquid chamber fitted into the first mounting member and having an elastic body as a part of the wall surface, and a partition member forming a sub liquid chamber provided independently of the main liquid chamber. Yes. The partition member is provided with a restriction passage that communicates the main liquid chamber and the sub liquid chamber. When vibration having a frequency equivalent to the resonance frequency of the restriction passage is input to the vibration isolator, the vibration is reduced. Absorbs and attenuates.

JP2012-172832A

  However, the conventional vibration isolator has room for improvement in terms of exhibiting damping characteristics with respect to vibrations of a wide range of frequencies.

  The present invention has been made in view of the above-described circumstances, and an object thereof is to provide a vibration isolator capable of exhibiting damping characteristics with respect to vibrations of a wide range of frequencies.

In order to solve the above problems, the present invention proposes the following means.
The vibration isolator according to the present invention includes a cylindrical first attachment member connected to one of the vibration generating portion and the vibration receiving portion, a second attachment member connected to the other, and both of these attachment members. An elastic body to be connected, a main liquid chamber fitted into the first mounting member and having the elastic body as a part of a wall surface, and a sub liquid chamber and an intermediate chamber provided independently from the main liquid chamber A partition member to be formed, and an elastic film constituting a part of the wall surface of the intermediate chamber, the partition member having a first restriction passage communicating the main liquid chamber and the sub liquid chamber, A second restriction passage extending from the main liquid chamber toward the intermediate chamber and having a flow resistance lower than the flow resistance of the first restriction passage, and a movable member disposed between the second restriction passage and the intermediate chamber. A body, and the intermediate chamber can be depressurized or pressurized with respect to a standard pressure. Is a, or inside the adjusting chamber which is closable open to the outside, characterized in that adjacent sandwiched between the elastic membrane.

According to the present invention, when vibration is input to the vibration isolator in the standard state where the adjustment chamber is set to the standard pressure or to the vibration isolator in the standard state where the adjustment chamber is opened to the outside, the liquid in the main liquid chamber It tries to circulate through the first restricted passage or the second restricted passage. Here, since the flow resistance of the second restriction passage is lower than the flow resistance of the first restriction passage, the liquid can be preferentially circulated through the second restriction passage. Therefore, in this vibration isolator, when vibration equivalent to the resonance frequency of the second restriction passage is input, resonance is generated in the second restriction passage, and this vibration can be absorbed and attenuated. When the liquid flows through the second restriction passage, the hydraulic pressure is exerted on the movable body, and the movable body is displaced and deformed while deforming the elastic film via the intermediate chamber.
On the other hand, when the vibration isolator is in an adjustment state in which the adjustment chamber is depressurized or pressurized with respect to the standard pressure, or in an adjustment state in which the adjustment chamber is closed to the outside, the vibration isolation device is in the standard state. In comparison, the elastic film can be restrained to increase the deformation resistance of the elastic film. As a result, it becomes possible to allow the elastic film to regulate the displacement and deformation of the movable body via the intermediate chamber, making it difficult for the liquid to flow through the second restriction passage and to flow through the first restriction passage. Can do. Therefore, when vibration is input to the vibration isolator, the liquid in the main liquid chamber can be preferentially circulated through the first restriction passage instead of the second restriction passage. Thereby, when vibration equivalent to the resonance frequency of the first restriction passage is input, resonance is generated in the first restriction passage, and this vibration can be absorbed and attenuated.
According to this vibration isolator, by switching between the standard state and the adjustment state, vibrations having different frequencies can be absorbed and attenuated, respectively, and a damping characteristic can be exhibited with respect to vibrations of a wide range of frequencies. .
Further, in the vibration isolator in the standard state, the liquid in the main liquid chamber flows through the second restricting passage while displacing and deforming the movable body. Therefore, the liquid pressure increase in the main liquid chamber is absorbed by the displacement and deformation of the movable body. Thus, it is possible to easily exhibit excellent damping characteristics. For example, an increase in the dynamic spring constant of the vibration isolator can be effectively suppressed.
Further, in the vibration isolator in the standard state, the liquid flowing through the second restriction passage displaces and deforms the movable body and deforms the elastic film. Therefore, the resonance frequency of the second restriction passage is set to the second restriction passage. The adjustment can be made based not only on the channel length and the channel cross-sectional area, but also on the displacement and deformation modes of the movable body and the deformation mode of the elastic membrane. Therefore, for example, by changing the bending rigidity of the movable body or the elastic film, the resonance frequency of the second restriction passage can be adjusted easily and in various ways, and the range of application of the vibration isolator can be easily varied. can do.

  The partition member is provided with a storage chamber that communicates the second restriction passage and the intermediate chamber, and the movable body is stored in the storage chamber so as to be displaceable in the axial direction of the first mounting member. May be.

In this case, when vibration is input to the vibration isolator in the standard state, the liquid displaces the movable body in the axial direction in the storage chamber, and the second restriction passage and the main liquid chamber and the intermediate chamber It circulates through the storage chamber and deforms the elastic membrane.
According to this vibration isolator, since the movable body is accommodated in the accommodating chamber so as to be displaceable in the axial direction, the displacement mode of the movable body is determined according to the frequency of vibration input to the vibration isolator. Therefore, the resonance frequency of the second restriction passage can be adjusted more easily and in a variety of ways.

  The diaphragm may constitute a part of the wall surface of the sub liquid chamber, and the deformation resistance of the diaphragm may be lower than the deformation resistance of the elastic film.

In this case, the vibration isolator is interposed between the vibration generator and the vibration receiver, and when an initial load is applied to the vibration isolator, the two attachment members relatively move while elastically deforming the elastic body. Displacement causes the fluid pressure in the main fluid chamber to fluctuate. Here, since the deformation resistance of the diaphragm is lower than the deformation resistance of the elastic film, the fluctuation of the hydraulic pressure in the main liquid chamber is applied not to the intermediate chamber but to the sub liquid chamber, and not the elastic film but the diaphragm is deformed to be elastic. Deformation of the film is suppressed.
According to this vibration isolator, since the elastic film is suppressed from being deformed when an initial load is applied to the vibration isolator, it is possible to suppress the influence of the deformation mode of the elastic film due to the initial load. Therefore, it is possible to easily exhibit the attenuation characteristics effectively.

  According to the vibration isolator of the present invention, it is possible to exhibit a damping characteristic with respect to a wide range of vibrations.

It is a longitudinal cross-sectional view which shows the standard state of the vibration isolator which concerns on one Embodiment of this invention. It is a longitudinal cross-sectional view which shows the adjustment state of the vibration isolator shown in FIG. It is a graph which shows the result of a verification test.

Hereinafter, a vibration isolator according to an embodiment of the present invention will be described with reference to the drawings.
As shown in FIG. 1, the vibration isolator 10 includes a cylindrical first mounting member 11 connected to one of a vibration generating unit and a vibration receiving unit, and a second mounting member 12 connected to the other. An elastic body 13 that elastically connects the first mounting member 11 and the second mounting member 12, and a main liquid chamber 14 that is fitted into the first mounting member 11 and has the elastic body 13 as a part of the wall surface, A partition member 17 that forms the sub-liquid chamber 15 and the intermediate chamber 16 provided independently of the main liquid chamber 14, a diaphragm 18 that forms part of the wall surface of the sub-liquid chamber 15, and a wall surface of the intermediate chamber 16. And an elastic film 19 constituting a part.

  When this liquid-filled vibration isolator 10 is mounted on, for example, an automobile, the second mounting member 12 is connected to an engine as a vibration generating unit, while the first mounting member 11 is connected to a vehicle body as a vibration receiving unit. As a result, the vibration of the engine is prevented from being transmitted to the vehicle body. In this vibration isolator 10, positive pressure acts on the main liquid chamber 14 based on the support load at the time of mounting.

  The first mounting member 11 is formed in a cylindrical shape, in the illustrated example, in a multistage cylindrical shape. Hereinafter, a direction along the axis O of the first mounting member 11 is referred to as an axial direction, a direction orthogonal to the axis O is referred to as a radial direction, and a direction around the axis O is referred to as a circumferential direction.

The second mounting member 12 is disposed at one end of the first mounting member 11 located on one side (hereinafter referred to as “one side”) along the axial direction. The second mounting member 12 is formed in a columnar shape arranged coaxially with the axis O.
The elastic body 13 is separately bonded to the inner peripheral surface of one end of the first mounting member 11 and the outer peripheral surface of the second mounting member 12, and closes one end of the first mounting member 11.

  The partition member 17 includes a main body member 20 and a flow path member 21. The main body member 20 is disposed coaxially with the axis O, and is liquid-tight in a portion of the first mounting member 11 that is located on the other side (hereinafter referred to as “the other side”) along the axial direction from the one end. It is mated. An end of the main body member 20 located on the other side is provided with an annular flange portion 20a that protrudes outward in the radial direction. The flow path member 21 is disposed coaxially with the axis O and is assembled to the main body member 20 from one side.

The main liquid chamber 14 is formed in a portion located between the elastic body 13 and the partition member 17 in the first attachment member 11. The hydraulic pressure in the main liquid chamber 14 varies when the elastic body 13 is deformed and the internal volume of the main liquid chamber 14 changes when vibration is input.
The sub liquid chamber 15 is separated from the main liquid chamber 14 on the other side, and is formed in an annular shape coaxial with the axis O. In the present embodiment, the auxiliary liquid chamber 15 is expanded and contracted by the liquid chamber recess 20 b formed in the main body member 20 opening toward the other side being closed by the diaphragm 18, and the diaphragm 18 being deformed.

  The diaphragm 18 is formed in an elastically deformable film shape. The diaphragm 18 is formed in an annular shape coaxial with the axis O, and closes the liquid chamber recess 20b from the other side. The inner peripheral edge and the outer peripheral edge of the diaphragm 18 are fixed to the main body member 20. The inner peripheral edge of the diaphragm 18 is vulcanized and bonded to a portion of the main body member 20 that is located on the inner side in the radial direction than the liquid chamber recess 20b. The outer peripheral edge of the diaphragm 18 is fixed to the flange portion 20a of the main body member 20, and in the illustrated example, between the flange portion 20a and the fixing ring 22 superimposed on the flange portion 20a from the other side. It is pinched.

  The intermediate chamber 16 is separated from the main liquid chamber 14 on the other side, and is disposed coaxially with the axis O. In the present embodiment, the intermediate chamber 16 is formed in the partition member 17, and the inner space 23 formed in the main body member 20 is partitioned by the elastic film 19. The intermediate chamber 16 expands and contracts when the elastic film 19 is deformed.

  The inner space 23 is formed in a portion of the main body member 20 that is located on the inner side in the radial direction than the liquid chamber recess 20b. The elastic film 19 is disposed in the central portion of the inner space 23 in the axial direction, and partitions the inner space 23 in the axial direction. The outer peripheral edge of the elastic film 19 is liquid-tightly fixed to the inner peripheral surface of the inner space 23 over the entire circumference in the circumferential direction. Of the inner space 23, a portion located on one side of the elastic film 19 is the intermediate chamber 16, and a portion located on the other side is the adjustment chamber 24 in which air (fluid) is accommodated. .

  The adjustment chamber 24 is adjacent to the intermediate chamber 16 with the elastic film 19 interposed therebetween. The adjustment chamber 24 is separated from the main liquid chamber 14 on the other side, is formed in the partition member 17, and is disposed coaxially with the axis O. The adjusting chamber 24 is formed in an inverted truncated cone shape that gradually decreases in diameter from one side to the other side. A portion connecting the peripheral wall surface and the bottom wall surface of the adjustment chamber 24 is formed in a concave curved surface shape that is concave toward the other side. The volume of the adjustment chamber 24 is preferably smaller than the volumes of the main liquid chamber 14 and the auxiliary liquid chamber 15 and not more than 1/5 of the volume of the main liquid chamber 14. For example, in the present embodiment, the volume of the adjustment chamber 24 is about 1/10 of the volume of the main liquid chamber 14.

The inside of the adjustment chamber 24 can be reduced with respect to the standard pressure. A connection hole 24 a to which an adjustment mechanism 25 provided outside the vibration isolator 10 is connected is opened on the bottom wall surface of the adjustment chamber 24. The adjustment mechanism 25 includes a switching valve 27 connected to the connection hole 24a via a connection pipe 26, and a control unit (not shown) that controls the switching valve 27.
The switching valve 27 is formed by, for example, an electromagnetic valve. For example, a negative pressure pipe 29 connected to a negative pressure source 28 such as an intake manifold of an engine and an atmospheric pressure pipe 30 opened to the atmosphere are connected to the switching valve 27. The switching valve 27 switches the pipe connected to the connection pipe 26 between the negative pressure pipe 29 and the atmospheric pressure pipe 30. The control unit controls the switching valve 27 based on, for example, the operating status of the vibration generating unit.

Here, the partition member 17 is provided with a first restriction passage 31, a second restriction passage 33, a storage chamber 34, and a movable body 35.
The first restriction passage 31 communicates the main liquid chamber 14 and the sub liquid chamber 15. The first restriction passage 31 is formed in the main body member 20 of the partition member 17, is arranged so as to avoid the axis O, and extends in the axial direction. The resonance frequency of the first restriction passage 31 is equivalent to the frequency of idle vibration (for example, the frequency is 15 Hz to 40 Hz and the amplitude is ± 0.5 mm or less), and the first restriction passage 31 is used as an input of idle vibration. On the other hand, resonance (liquid column resonance) is generated.

The second restriction passage 33 extends from the main liquid chamber 14 toward the intermediate chamber 16. The second restriction passage 33 is formed in the flow path member 21 of the partition member 17 and penetrates the flow path member 21 in the axial direction. The second restriction passage 33 is disposed in the flow path member 21 while avoiding the axis O, and a plurality of second restriction passages 33 are provided at intervals in the circumferential direction. The resonance frequency of the second restriction passage 33 is equivalent to the frequency of lock-up vibration (for example, the frequency is about 80 Hz), and the second restriction passage 33 resonates with respect to the input of the lock-up vibration (liquid column resonance). ).
The flow resistance of the second restriction passage 33 is lower than the flow resistance of the first restriction passage 31. The flow resistance of each restriction passage is determined based on, for example, the flow path length or the cross-sectional area of each restriction passage.

  The storage chamber 34 communicates the second restriction passage 33 and the intermediate chamber 16. The storage chamber 34 is disposed in a portion of the partition member 17 that is sandwiched in the axial direction between the second restriction passage 33 and the intermediate chamber 16. The storage chamber 34 is arranged coaxially with the axis O. The storage chamber 34 is formed by a recess that opens toward one side of the main body member 20 of the partition member 17. A communication hole 36 that opens toward the intermediate chamber 16 is formed in the bottom wall surface of the storage chamber 34. A plurality of communication holes 36 are formed at each position facing the second restriction passage 33 in the axial direction on the bottom wall surface of the storage chamber 34.

  The movable body 35 is disposed between the second restriction passage 33 and the intermediate chamber 16. The movable body 35 is a so-called loose membrane that is accommodated in the accommodation chamber 34 so as to be displaceable in the axial direction. The movable body 35 is made of an elastic material such as a rubber material, for example, and is formed in a plate shape whose front and back faces in the axial direction.

  In the vibration isolator 10, the deformation resistance of the diaphragm 18 is lower than the deformation resistance of the elastic film 19. The deformation resistance of the diaphragm 18 and the elastic film 19 is based on, for example, the Young's modulus of the material forming each member, the thickness of each member, etc., and the change in volume per unit load in each member. It can be adjusted by appropriately changing the amount and the like.

  The vibration isolator 10 is a liquid enclosure type in which a liquid such as ethylene glycol, water, or silicone oil is enclosed. In the vibration isolator 10, the main liquid chamber 14, the sub liquid chamber 15, the intermediate chamber 16, the first restriction passage 31, the second restriction passage 33, the storage chamber 34, and the communication hole 36 are filled with the liquid. .

  Next, the operation of the vibration isolator 10 will be described.

  When the vibration isolator 10 is interposed between the vibration generating unit and the vibration receiving unit, the second mounting member 12 is displaced toward the other side with respect to the first mounting member 11 in the vibration isolating device 10. The initial load is applied to reduce the main liquid chamber 14, and the liquid pressure in the main liquid chamber 14 is fluctuated and increased. Here, in the vibration isolator 10, since the deformation resistance of the diaphragm 18 is lower than the deformation resistance of the elastic film 19, the liquid pushed out from the main liquid chamber 14 at this time is a secondary liquid having the diaphragm 18 as a part of the wall surface. It flows into the chamber 15. As a result, the fluctuation of the hydraulic pressure in the main liquid chamber 14 is applied not to the intermediate chamber 16 but to the sub liquid chamber 15, and not the elastic film 19 but the diaphragm 18 is deformed to suppress deformation of the elastic film 19.

  Further, in the vibration isolator 10, the control unit of the adjustment mechanism 25 controls the switching valve 27 so that the internal pressure of the adjustment chamber 24 is a standard pressure as shown in FIG. As shown, the adjustment chamber 24 is switched to an adjustment state in which the internal pressure of the adjustment chamber 24 is reduced relative to the standard pressure. In the vibration isolator 10 in the adjusted state, the inside of the adjustment chamber 24 is depressurized, so that the elastic film 19 comes into close contact with the peripheral wall surface and the bottom wall surface of the adjustment chamber 24, and the adjustment chamber 24 shrinks and disappears. Expands. When the decompression to the inside of the adjustment chamber 24 is released, the elastic film 19 is restored and deformed, and the adjustment chamber 24 is restored to the standard pressure.

  For example, when the vibration isolator 10 is applied to an automobile, the control unit can control the switching valve 27 based on the number of rotations of the engine as the vibration generating unit and the vehicle speed. Further, in this case, when the automobile is in a running state, the control unit connects the connection pipe 26 and the atmospheric pressure pipe 30 by the switching valve 27 and sets the internal pressure of the adjustment chamber 24 to the atmospheric pressure as the standard pressure. Further, when the automobile is in an idle state, the control unit connects the connection pipe 26 and the negative pressure pipe 29 by the switching valve 27 to reduce the internal pressure of the adjustment chamber 24. In the case where an intake manifold is applied as the negative pressure source 28, the inside of the adjustment chamber 24 can be decompressed using the suction negative pressure generated in the intake manifold.

  When vibration is input in the axial direction to the vibration isolator 10 in the standard state as shown in FIG. 1, both the attachment members 11 and 12 are relatively displaced in the axial direction while elastically deforming the elastic body 13. The liquid pressure in the liquid chamber 14 fluctuates, and the liquid in the main liquid chamber 14 tends to flow through the first restriction passage 31 or the second restriction passage 33. Here, since the flow resistance of the second restriction passage 33 is lower than the flow resistance of the first restriction passage 31, the liquid in the main liquid chamber 14 can be preferentially circulated through the second restriction passage 33 at this time. it can. Therefore, the vibration isolator 10 causes resonance in the second restricting passage 33 when a lock-up vibration that is equivalent to the resonance frequency of the second restricting passage 33 is input. Vibration can be absorbed and damped by suppressing an increase in the dynamic spring constant.

  When the liquid flows through the second restriction passage 33, the hydraulic pressure is applied to the movable body 35, and the movable body 35 is displaced and deformed while deforming the elastic film 19 via the intermediate chamber 16. At this time, in this embodiment, the liquid flows through the second restriction passage 33 and the storage chamber 34 between the main liquid chamber 14 and the intermediate chamber 16 while moving the movable body 35 in the axial direction in the storage chamber 34. Then, the elastic film 19 is deformed.

  On the other hand, as shown in FIG. 2, when the vibration isolator 10 is in the adjusted state, the elastic film 19 is restrained and the deformation resistance of the elastic film 19 is increased compared to the case where the vibration isolator 10 is in the standard state. Can do. As a result, the elastic film 19 can be restricted from displacement and deformation of the movable body 35 via the intermediate chamber 16, and it is difficult for the liquid to flow through the second restriction passage 33, so that the liquid is passed through the first restriction passage 31. It can be made easy to distribute. Therefore, when vibration is input to the vibration isolator 10, the liquid in the main liquid chamber 14 can be preferentially circulated through the first restriction passage 31 instead of the second restriction passage 33. As a result, when idle vibration that is equivalent to the resonance frequency of the first limiting passage 31 is input, resonance is generated in the first limiting passage 31, and for example, an increase in the dynamic spring constant of the vibration isolator 10 is suppressed. For example, vibration can be absorbed and damped.

As described above, according to the vibration isolator 10 according to the present embodiment, it is possible to absorb and attenuate vibrations having different frequencies by switching between the standard state and the adjustment state, and vibrations with a wide range of frequencies. Can exhibit damping characteristics.
Further, since the elastic film 19 is suppressed from being deformed when an initial load is applied to the vibration isolator 10, it is possible to suppress the influence of the deformation mode of the elastic film 19 from being caused by the initial load. Thus, the attenuation characteristics can be easily exhibited effectively.

  Further, in the vibration isolator 10 in the standard state, the liquid in the main liquid chamber 14 flows through the second restricting passage 33 while displacing and deforming the movable body 35. Therefore, the increase in the liquid pressure in the main liquid chamber 14 is movable. It is possible to easily absorb the displacement and deformation of the body 35 to exhibit excellent damping characteristics. For example, it is possible to effectively suppress an increase in the dynamic spring constant of the vibration isolator 10.

  Further, in the vibration isolator 10 in the standard state, the liquid flowing through the second restriction passage 33 displaces and deforms the movable body 35 and also deforms the elastic film 19, so that the resonance frequency of the second restriction passage 33 is set. In addition to the flow path length and flow path cross-sectional area of the second restriction passage 33, adjustment can be made based on the displacement and deformation modes of the movable body 35, the deformation mode of the elastic film 19, and the like. Therefore, for example, by changing the bending rigidity of the movable body 35 and the elastic film 19, the resonance frequency of the second restriction passage 33 can be adjusted easily and in various ways. It can be made easy to spread.

  Further, since the movable body 35 is accommodated in the accommodation chamber 34 so as to be freely displaceable in the axial direction, the displacement mode of the movable body 35 can be set with high accuracy according to the frequency of vibration input to the vibration isolator 10. It becomes possible to adjust, and the resonant frequency of the 2nd restriction | limiting channel | path 33 can be adjusted more simply and variously.

  The technical scope of the present invention is not limited to the above embodiment, and various modifications can be made without departing from the spirit of the present invention.

In the embodiment, the inside of the adjustment chamber 24 can be reduced with respect to the standard pressure, but the present invention is not limited to this.
For example, in the first modification of the present invention, the inside of the adjustment chamber can be pressurized against the standard pressure, and the adjustment state of the vibration isolator is pressed against the standard pressure in the adjustment chamber to restrain the elastic membrane. It is good also as a state. In this case, for example, a pressure source can be employed instead of the negative pressure source.
Further, for example, in the second modification of the present invention, the adjustment chamber is opened so that the inside of the adjustment chamber can be closed with respect to the outside, and the standard state of the vibration isolation device is opened to the outside. The state may be a state in which the adjustment chamber is closed with respect to the outside. In this case, in the vibration isolator in the adjusted state, the elastic film can be restrained by using the pressure in the adjustment chamber as the back pressure. In this configuration, an opening / closing valve that opens and closes the adjustment chamber with respect to the outside of the vibration isolator may be employed instead of the switching valve. Furthermore, an opening / closing mechanism that directly opens and closes the connection hole may be employed instead of the switching valve and the connection pipe.

  Moreover, in the said embodiment, although the movable body 35 is accommodated in the storage chamber 34 so that displacement in the axial direction is possible, this invention is not limited to this. For example, the movable body may be configured by an elastic partition wall that partitions the second restriction passage and the intermediate chamber, and the outer peripheral edge of the movable body may be liquid-tightly fixed to the partition member over the entire circumference in the circumferential direction. .

  In addition, it is possible to appropriately replace the constituent elements in the embodiment with known constituent elements without departing from the spirit of the present invention, and the above-described modified examples may be appropriately combined.

  Next, the verification test about the effect demonstrated above was implemented.

In this verification test, two vibration isolators of Examples 1 and 2 were prepared. The vibration isolator shown in FIGS. 1 and 2 was adopted in Example 1, and the vibration isolator according to the second modification was adopted in Example 2.
And after making the vibration isolator of Example 1 into a standard state, the vibration from which a frequency differs was input separately, and the dynamic spring constant at the time of each vibration input was measured. Furthermore, even when each vibration isolator of Examples 1 and 2 was in an adjusted state, vibrations with different frequencies were input separately, and the dynamic spring constant at each vibration input was measured.

  The results are shown in FIG. In the graph shown in FIG. 3, the horizontal axis indicates the frequency (Hz), and the vertical axis indicates the dynamic spring constant. Of the graph lines shown in this graph, the graph line G1 indicated by the alternate long and short dash line indicates the result of the standard state of Example 1, and the graph line G2 indicated by the broken line indicates the result of the adjustment state of Example 1. The graph line G3 indicated by a solid line indicates the result of the adjustment state of the second embodiment.

  From this result, in the vibration isolator of Example 1, the dynamic spring constant is suppressed when the lock-up vibration that is about 80 Hz is input in the standard state, and the frequency is about 15 Hz to 40 Hz in the adjusted state. It was confirmed that the dynamic spring constant was suppressed when idle vibration, which is vibration, was input. In the vibration isolator of Example 2, it was also confirmed that the dynamic spring constant was suppressed when an idle vibration having a frequency of about 15 Hz to 40 Hz was input in the adjusted state.

DESCRIPTION OF SYMBOLS 10 Vibration isolator 11 1st attachment member 12 2nd attachment member 13 Elastic body 14 Main liquid chamber 15 Sub liquid chamber 16 Intermediate chamber 17 Partition member 18 Diaphragm 19 Elastic film 24 Adjustment chamber 31 1st restriction path 33 2nd restriction path 34 Containment chamber 35 Movable body

In order to solve the above problems, the present invention proposes the following means.
The vibration isolator according to the present invention includes a cylindrical first attachment member connected to one of the vibration generating portion and the vibration receiving portion, a second attachment member connected to the other, and both of these attachment members. An elastic body to be connected, a main liquid chamber fitted into the first mounting member and having the elastic body as a part of a wall surface, and a sub liquid chamber and an intermediate chamber provided independently from the main liquid chamber A partition member to be formed, and an elastic film constituting a part of the wall surface of the intermediate chamber, the partition member having a first restriction passage communicating the main liquid chamber and the sub liquid chamber, A second restriction passage extending from the main liquid chamber toward the intermediate chamber and having a flow resistance lower than the flow resistance of the first restriction passage, and a movable member disposed between the second restriction passage and the intermediate chamber. A body, and the intermediate chamber can be depressurized or pressurized with respect to a standard pressure. When the closable open the adjustment chamber, adjacent in between the elastic membrane, the adjustment chamber, whose pressure vacuum or under relative standard pressure to the to, or inside an external, Alternatively, when closed against the outside, the elastic film is restrained to increase the deformation resistance of the elastic film, and the elastic film is allowed to regulate the displacement and deformation of the movable body via the intermediate chamber. Features.

The partition member is provided with a storage chamber that communicates the second restriction passage and the intermediate chamber, and the movable body is stored in the storage chamber so as to be displaceable in the axial direction of the first mounting member. The main liquid chamber and the intermediate chamber may be communicated only through the second restriction passage and the storage chamber .
Furthermore, the partition member is assembled to the main body member from the one side where the main liquid chamber is located with respect to the main body member along the axial direction with the main body member fitted in the first mounting member. The storage chamber is disposed between the main body member and the flow path member coaxially with the axis of the first mounting member, and the second restricting passage is formed of the flow path member. The member may be arranged so as to avoid the axis.

Claims (3)

A cylindrical first mounting member coupled to one of the vibration generating unit and the vibration receiving unit, and a second mounting member coupled to the other;
An elastic body connecting both of these mounting members;
A partition member which is fitted in the first mounting member and forms a main liquid chamber having the elastic body as a part of a wall surface, and a sub liquid chamber and an intermediate chamber provided independently from the main liquid chamber;
An elastic membrane constituting a part of the wall surface of the intermediate chamber,
The partition member has a first restriction passage communicating the main liquid chamber and the sub liquid chamber, and extends from the main liquid chamber toward the intermediate chamber, and a flow resistance is a flow resistance of the first restriction passage. A lower second restriction passage, and a movable body disposed between the second restriction passage and the intermediate chamber,
In the intermediate chamber, an adjustment chamber whose inside is capable of being depressurized or pressurized with respect to a standard pressure or opened so that the inside can be closed with respect to the outside is adjacent to the elastic chamber with the elastic membrane interposed therebetween. An anti-vibration device characterized by that. The vibration isolator according to claim 1,
The partition member is provided with a storage chamber that communicates the second restriction passage and the intermediate chamber,
The vibration isolator according to claim 1, wherein the movable body is housed in the housing chamber so as to be freely displaceable in the axial direction of the first mounting member. A vibration isolator according to claim 2,
Comprising a diaphragm constituting a part of the wall surface of the auxiliary liquid chamber;
The vibration isolation device according to claim 1, wherein a deformation resistance of the diaphragm is lower than a deformation resistance of the elastic film.

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