JP2013002600A - Vibration control device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a vibration control device which exhibits damping characteristics stably, enhances quietness property, and easily secure the performance of an elastic plate a long time period.SOLUTION: The vibration control device 10 includes a cylindrical first mounting member and a cylindrical second mounting member 12, and an elastic body members 13 for connecting both mounting members, wherein a plurality of liquid chambers 26 sealed with liquid are defined within the first mounting member and the plurality of liquid chambers 26 are communicated with each other through a first limiting passage 30 and a second limiting passage 31 with its resonance frequency higher than that of the first limiting passage 30. The second limiting passage 31 includes a storage chamber 39 which stores the elastic plate 38, a communication part 40 which allows the storage chamber 39 to communicate with the liquid chambers 26, and a switching means 58 which switches the opening/closing of the communication part 40, and the switching means 58 includes a movable member 41 arranged to be movable between the opening position for opening the communication part 40 and the closing position for closing the communication part 40, and a drive part for movably supporting the movable member 41.

Description

  The present invention relates to a vibration isolator.

  Conventionally, for example, a vibration isolator as described in Patent Document 1 below is known. This vibration isolator connects a cylindrical first mounting member connected to one of a vibration generating portion and a vibration receiving portion, a second mounting member connected to the other, and both the mounting members. And an elastic member. In addition, a plurality of liquid chambers filled with liquid are defined in the first mounting member, and at least one of these liquid chambers is configured such that a part of the wall surface is constituted by an elastic member. Yes. Further, the plurality of liquid chambers communicate with each other through the first restriction passage and the second restriction passage having a resonance frequency higher than that of the first restriction passage. In the second restriction passage, the hydraulic pressure acts when vibration is input to the vibration isolator, thereby closing the second restriction passage and communicating between the liquid chambers through the second restriction passage. The elastic board which interrupts | blocks is accommodated.

Japanese Patent Laid-Open No. 10-299821

However, in the conventional vibration isolator, when vibration having a frequency equivalent to the resonance frequency of the first restriction passage is input, it takes time until the second restriction passage is closed due to the hydraulic pressure acting on the elastic plate. Therefore, immediately after the vibration is input, the liquid flows between the liquid chambers not only in the first restriction passage but also in the second restriction passage.
In addition, since the communication between the liquid chambers through the second restriction passage is blocked by closing the second restriction passage with the elastic plate, the elastic member is elastic when vibration is input in the state where the second restriction passage is cut off. When the hydraulic pressure acts on the plate and the elastic plate vibrates, for example, the second restriction passage may be opened and the liquid may flow through the second restriction passage.
From the above, it has been difficult to stably exhibit the damping characteristics at the time of vibration input.

Further, as described above, when the elastic plate vibrates when vibration is input while the second restriction passage is blocked, vibration noise may be generated.
Furthermore, regardless of whether the fluid chambers are communicated with each other through the second restriction passage and when the communication is interrupted, the fluid pressure acts on the elastic plate, so that the elastic plate reaches the end of its life early. There was also a fear.

  The present invention has been made in view of the above-described circumstances, and an object of the present invention is to prevent the stable performance of the elastic plate over a long period of time while stably exhibiting the damping characteristics and enhancing the quietness. It is to provide a vibration device.

In order to solve the above problems, the present invention proposes the following means.
A vibration isolator according to the present invention includes a cylindrical first mounting member connected to one of a vibration generating unit and a vibration receiving unit, a second mounting member connected to the other, and both of these mountings. A plurality of liquid chambers in which a liquid is sealed, and at least one of these liquid chambers is a wall surface. Is formed of the elastic member, and the plurality of liquid chambers communicate with each other through a first restriction passage and a second restriction passage having a resonance frequency higher than that of the first restriction passage. The passage is a vibration isolator including a storage chamber in which an elastic plate is stored, and a communication portion that communicates the storage chamber and the liquid chamber, and includes a switching unit that switches between opening and closing of the communication portion, The switching means includes an open position for opening the communication portion, Characterized in that it comprises a closing position for closing the passage portion, a movable member and disposed for movement between a driving unit for movably supporting the movable member.

In this invention, the drive unit is operated according to the frequency of vibration input to the vibration isolator, and the communication unit is opened and closed by moving the movable member between the open position and the closed position. The connection between the liquid chamber and the liquid chamber and the blocking thereof are switched, and the communication between the liquid chambers through the second restriction passage and the blocking thereof are switched.
As described above, since the communication of the second restricted passage and the cutoff thereof are switched by moving the movable member by the drive unit, vibration having a frequency equivalent to the resonance frequency of the first restricted passage is input to the vibration isolator. In such a case, the second restricting passage can be blocked with good responsiveness by operating the drive unit.
Further, since the communication between the liquid chambers through the second restriction passage is blocked by moving the movable member to the closed position, the movable member is formed of a material having higher rigidity than the material forming the elastic plate. The hydraulic pressure can be effectively received by the movable member, and the shut-off state of the second restriction passage can be easily ensured.
As described above, the attenuation characteristic can be stably exhibited.

Further, since the communication between the liquid chambers through the second restriction passage is blocked by closing the communication portion, when vibration is input to the vibration isolator with the second restriction passage blocked, the liquid chamber It becomes possible to suppress that a pressure acts on an elastic board, and it can make it easy to ensure the performance of an elastic board over a long period of time.
Furthermore, since vibration can be suppressed from acting on the elastic plate when vibration is input to the vibration isolator with the second restriction passage blocked, the vibration sound of the elastic plate can be suppressed. It is also possible to suppress the occurrence of noise and increase the quietness.

  Further, the second restriction passage may be provided in an defining member that defines the plurality of liquid chambers.

  In this case, since the second restriction passage is provided in the defining member, the vibration isolator can be reduced in size.

  The storage chamber may be provided in the movable member.

In this case, since the storage chamber is provided in the movable member, the vibration isolator can be simplified.
In addition, when the movable member moves between the open position and the closed position by rotating around the rotation axis, it is possible to reduce the space necessary for the movement of the movable member. Miniaturization can be achieved.

  The second restriction passage is provided in an defining member that defines the plurality of liquid chambers, and the movable member is inserted into the fitting hole provided in the defining member. The storage chamber is provided in the movable member, and the communication portion is open on both the wall surface of the liquid chamber and the inner peripheral surface of the fitting hole. A first portion and a second portion disposed on the movable member so as to open to an outer peripheral surface of the movable member, and communicating the first portion and the storage chamber. When the movable member is located at the closed position, the first portion is closed by the outer peripheral surface of the movable member and the second portion is closed by being closed by the inner peripheral surface of the fitting hole. Good.

  In this case, when the movable member is located at the closed position, the first portion of the communication portion is blocked by the outer peripheral surface of the movable member, and the second portion of the communication portion is blocked by the inner peripheral surface of the fitting hole. As a result, the communication portion is closed, so that the communication between the storage chamber and the liquid chamber can be reliably blocked, and the blocking state of the second restriction passage can be easily ensured.

  According to the vibration isolator according to the present invention, it is possible to stably exhibit the damping characteristics, improve the silence, and easily ensure the performance of the elastic plate over a long period of time.

It is a perspective view which shows the vibration isolator which concerns on one Embodiment of this invention. It is an AA cross-sectional arrow view shown in FIG. It is a BB cross-sectional arrow view shown in FIG. It is a cross-sectional view of the principal part of the vibration isolator shown in FIG. It is a front view of the defining member which comprises the vibration isolator shown in FIG. It is a disassembled perspective view of the principal part of the vibration isolator shown in FIG. In the vibration isolator shown in FIG. 1, it is a longitudinal cross-sectional view in the state in which an accommodating member is located in a closed position. In the vibration isolator shown in FIG. 1, it is a cross-sectional view in the state in which a storage member is located in a closed position.

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. And an elastic member 13 that couples both the attachment members 11 and 12. The vibration isolator 10 is used as, for example, a suspension bush for an automobile, an engine mount, or a mount for an industrial machine installed in a factory.
Here, as shown in FIG. 2, the second attachment member 12 is formed in a cylindrical shape, and the central axes of the attachment members 11 and 12 are located on a common axis. Hereinafter, the common axis is referred to as an axis O1, and the direction of circling around the axis O1 is referred to as a circumferential direction.

The first mounting member 11 has an inner cylinder portion 14 having an equal inner diameter over the entire length in the axis O1 direction, and is fitted to the inner cylinder portion 14 and has a size along the axis O1 direction that is the inner cylinder portion 14. It has a double cylinder structure including an outer cylinder portion 15 which is equivalent.
The inner diameter and the outer diameter of the second mounting member 12 are equal over the entire length in the direction of the axis O1, and both end portions of the second mounting member 12 in the direction of the axis O1 are outside the first mounting member 11 in the direction of the axis O1. Protrusively toward.

The elastic member 13 is made of an elastic material such as a rubber material, for example. A cylindrical portion 16 having an inner peripheral portion vulcanized and bonded to the outer peripheral surface of the second mounting member 12 over the entire surface, and an annular portion 17 having an inner peripheral portion connected to each end portion of the cylindrical portion 16 in the direction of the axis O1. It is equipped with.
As shown in FIG. 3, an intermediate member 18 is vulcanized and bonded to the outer peripheral portion of the elastic member 13. The intermediate member 18 is disposed in the same axis as the axis O1, and has a cylindrical fitting portion 19 which is vulcanized and bonded to the outer peripheral portion of each annular portion 17 of the elastic member 13, and the fitting portions 19 are connected to each other in the direction of the axis O1. And a connecting portion 20 connected to the.
Both end portions of the first attachment member 11 in the direction of the axis O1 are externally fitted to the fitting portion 19, whereby the first attachment member 11 is coupled to the elastic body member 13 via the intermediate member 18. Yes.

  As shown in FIGS. 3 and 4, the connecting portion 20 is perpendicular to the axis O1 in the direction of the imaginary axis O2 along the imaginary axis (rotary axis) O2 passing through the center of the first mounting member 11 in the direction of the axis O1. A pair is arranged across the axis O1. As shown in FIG. 3, each connecting portion 20 includes a main plate portion 21 that extends in the direction of the axis O <b> 1 and is vulcanized and bonded to the outer peripheral portion of the tubular portion 16 of the elastic member 13, and the axis O <b> 1 direction of the main plate portion 21. Side plate portions 22 that extend outward from the both end portions in the direction of the virtual axis O2. The side plate portion 22 is vulcanized and bonded to the annular portion 17 from the inside in the axis O1 direction, and the outer end portion of the side plate portion 22 in the imaginary axis O2 direction is connected to the fitting portion 19.

  As shown in FIGS. 2 and 4, the elastic member 13 is exposed from both circumferential gaps 23 provided between the connecting portions 20. In the elastic member 13, each exposed portion 24 exposed from both the gaps 23 faces outward in the orthogonal direction perpendicular to both the axis O <b> 1 and the virtual axis O <b> 2, and one of these exposed portions 24. Is formed with a bulging portion 25 bulging outward in the orthogonal direction.

  In the first mounting member 11, a plurality of liquid chambers 26 in which a liquid is sealed are defined by an defining member 27. As shown in FIG. 4, the defining member 27 is formed in a cylindrical shape arranged coaxially with the axis O <b> 1, and is externally fitted to the main plate portion 21 of the connecting portion 20 in the intermediate member 18. A plurality of liquid chambers 26 are defined between the exposed portions 24.

In the present embodiment, the defining member 27 includes a pair of small diameter portions 28 arranged with the axis O1 in the imaginary axis O2 direction, and a large diameter portion 29 arranged with a pair of the axis O1 in the orthogonal direction. They are connected to each other in the circumferential direction.
The central portion in the circumferential direction of the small diameter portion 28 is in contact with the main plate portion 21 of the intermediate member 18 from the outside of the main plate portion 21 in the imaginary axis O2 direction. Further, of the pair of small-diameter portions 28, at both ends in the circumferential direction of one small-diameter portion 28, recessed portions 36 that are recessed toward the outside in the direction of the virtual axis O2 are provided.
The large-diameter portion 29 is disposed with a gap in the orthogonal direction between each exposed portion 24 of the elastic member 13, and this gap is formed in the annular shape of the elastic member 13 as shown in FIG. 2. The liquid chamber 26 including the gap and the recessed portion 36 is defined by being closed from both sides in the axis O1 direction by the portion 17.

  A pair of the liquid chambers 26 are provided in the first mounting member 11, and as shown in FIG. 4, these liquid chambers 26 are arranged in parallel with the axis O <b> 1 sandwiched in the orthogonal direction. In the present embodiment, these two liquid chambers 26 are different in shape and volume, and when a load is input to the vibration isolator 10 in the direction of the axis O1 or in the orthogonal direction, the amount of change in the volume of the liquid chambers 26 is different. Configured differently.

  The plurality of liquid chambers 26 communicate with each other via a first restriction passage 30 and a second restriction passage 31 having a resonance frequency higher than that of the first restriction passage 30. The resonance frequency of the first restriction passage 30 is equal to the frequency of shake vibration (for example, the frequency is 14 Hz or less and the amplitude is greater than ± 0.5 mm), and the resonance frequency of the second restriction passage 31 is idle vibration ( For example, the frequency is equivalent to a frequency of 18 Hz to 30 Hz and an amplitude of ± 0.5 mm or less. In the present embodiment, the flow resistance of the second restriction passage 31 is smaller than the flow resistance of the first restriction passage 30.

As shown in FIGS. 4 and 5, the first restriction passage 30 includes a first circumferential groove 32 extending in the circumferential direction on the outer circumferential surface of the defining member 27, and each circumferential end portion of the first circumferential groove 32. A pair of vertical grooves 33 extending in the direction of the axis O 1, a pair of second peripheral grooves 34 extending in the circumferential direction from the vertical grooves 33, a peripheral end of each second peripheral groove 34, and the liquid chamber 26 And a pair of communication holes 35 communicating with each other.
The first circumferential groove 32 has a C-shape that opens toward the virtual axis O2 in a plan view viewed from the direction of the axis O1. Both peripheral end portions of the first circumferential groove 32 are located in the pair of large diameter portions 29 of the defining member 27, and a portion of the first circumferential groove 32 located between the peripheral end portions is a pair of small diameter portions. The portion 28 is located in the other small diameter portion 28 different from the one small diameter portion 28.
The second circumferential groove 34 extends from the end of the longitudinal groove 33 that is not connected to the first circumferential groove 32 toward the other small diameter portion 28 along the circumferential direction. . The communication hole 35 is open to an end portion that is not connected to the vertical groove 33 among both peripheral end portions of the second circumferential groove 34.

As shown in FIG. 4, the second restriction passage 31 is provided in the defining member 27 and extends in the circumferential direction. In the present embodiment, the second restricting passage 31 is arranged in the middle portion 37 located between the recessed portions 36 of the one small diameter portion 28 so as to open to the recessed portions 36 separately. ing.
The second restriction passage 31 includes a storage chamber 39 in which the elastic plate 38 is stored, and a communication portion 40 that allows the storage chamber 39 and the liquid chamber 26 to communicate with each other.
The storage chamber 39 is provided in a storage member (movable member) 41 provided in the defining member 27. In the present embodiment, the housing member 41 is fitted in a fitting hole 42 provided in the defining member 27.

  The fitting hole 42 penetrates the intermediate portion 37 of the defining member 27 coaxially with the virtual axis O2. The fitting hole 42 is formed in a multistage shape in which an inner portion 43 that opens toward the inner side in the virtual axis O2 direction is larger in diameter than an outer portion 44 that opens toward the outer side in the virtual axis O2 direction. In the inner end portion of the portion 43 in the imaginary axis O2 direction, a seal plate portion 45 constituting the inner surface of the one small diameter portion 28 in the imaginary axis O2 direction is fitted.

The housing member 41 is disposed coaxially with the virtual axis O2 and is fitted in the inner portion 43 of the fitting hole 42, and in the inner end portion of the main body 46 in the virtual axis O2 direction. The fitted lid part 47, the bottom part 48 that closes the main body part 46 from the outside in the virtual axis O2 direction, and the coaxially projecting from the bottom part 48 toward the outside in the virtual axis O2 direction and coaxial with the virtual axis O2 And a shaft portion 49 fitted in the outer portion 44 of the joint hole 42.
In the illustrated example, the main body portion 46, the bottom portion 48, and the shaft portion 49 are integrally formed of a material having higher rigidity than the material forming the elastic plate 38, such as a metal material or a synthetic resin material. The lid 47 is provided with a mounting projection 51 that is fitted into a mounting hole 50 provided coaxially with the virtual axis O2 on the seal plate 45, and projects inward in the direction of the virtual axis O2.

  As shown in FIG. 6, a pair of partition members 52 extending in the direction of the axis O <b> 1 are disposed in the main body portion 46 at intervals in the circumferential direction. The partition member 52 is formed in a plate shape whose front and back surfaces are along the direction of the virtual axis O <b> 2, and is disposed at the center in the circumferential direction in the main body 46. Of the partition member 52, both end portions in the axis O1 direction and outer end portions in the virtual axis O2 direction are individually connected to the inner surface of the storage chamber 39 over the entire length, and the inner end portions in the virtual axis O2 direction are The lid 47 is in liquid-tight contact with the entire length. The space between the partition members 52 is the accommodation chamber 39.

The elastic plate 38 is made of an elastic material such as a rubber material, for example. The elastic plate 38 is formed smaller than the partition member 52 and is disposed in the accommodating chamber 39 so as to be movable in the circumferential direction. When the elastic plate 38 moves in the circumferential direction in the accommodation chamber 39 and comes into contact with the partition member 52, the movement along the circumferential direction is restricted, and the elastic plate 38 moves in the circumferential direction beyond the accommodation chamber 39. Movement is restricted.
In the illustrated example, the elastic plate 38 is formed in a plate shape whose front and back surfaces extend in both directions of the axis O1 direction and the virtual axis O2, and the shape of the elastic plate 38 viewed from the circumferential direction is the axis O1. It has a long rectangular shape. In this embodiment, the elastic plate 38 attenuates and absorbs high-frequency vibration (for example, the frequency is 100 Hz or more) having a frequency higher than that of idle vibration.

As shown in FIG. 4, a pair of communication portions 40 are disposed with the accommodation chamber 39 sandwiched in the circumferential direction. As shown in FIGS. 4 and 6, the communicating portion 40 includes a first portion 53 that opens on both the wall surface of the liquid chamber 26 and the inner peripheral surface of the fitting hole 42, and the accommodating member 41. A second portion 54 disposed so as to open to both the outer peripheral surface and the inner peripheral surface 42; a third portion 55 defined between the inner peripheral surface of the housing member 41 and the partition member 52; and a partition 4th part 56a, 56b penetrated by the member 52 in the circumferential direction is provided.
As shown in FIG. 4, the first portion 53 extends in the circumferential direction in the intermediate portion 37 of the defining member 27, and opens to the inner surface of the recessed portion 36 of the wall surface of the liquid chamber 26. In the fitting hole 42, an opening is made on the inner peripheral surface of the inner portion 43.

The second portion 54 is provided in the circumferential direction in each portion that sandwiches the virtual axis O <b> 2 in the circumferential direction in the main body portion 46 of the housing member 41. The size of the second portion 54 along the virtual axis O2 direction is equal to the size of the first portion 53 along the virtual axis O2 direction. As shown in FIG. 6, the second portion 54 extends around the virtual axis O2, and the size of the second portion 54 along the virtual axis O2 is a position along the virtual axis O2. Regardless of whether it is the same. The second portion 54 communicates with the accommodation chamber 39 through the third portion 55 and the fourth portions 56 a and 56 b, and communicates the first portion 53 and the accommodation chamber 39.
The fourth portions 56a and 56b include one large window portion 56a disposed at the central portion in the axis O1 direction of the partition member 52, and a plurality of small window portions 56b disposed at both ends of the partition member 52 in the axis O1 direction. It is equipped with.

And in this embodiment, the said vibration isolator 10 is provided with the switching means 58 which switches opening and closing of the communication part 40, as shown in FIG.3, FIG.4, FIG.7 and FIG. The switching means 58 includes the housing member 41 and a drive unit 59 that supports the housing member 41 so as to be movable.
The housing member 41 is disposed so as to be movable between an open position where the communication portion 40 is opened and a closed position where the communication portion 40 is closed. In the illustrated example, the accommodating member 41 is slidably fitted around the virtual axis O2 in the fitting hole 42, and is rotated around the virtual axis O2, so that the open position and the closed position are set. Move between.

  As shown in FIG. 4, when the storage member 41 is in the open position, the second portion 54 and the first portion 53 of the communication portion 40 communicate with each other to open the communication portion 40, and the storage chamber 39 and the liquid chamber are opened. 26 and the liquid chambers 26 communicate with each other through the second restriction passage 31. On the other hand, as shown in FIGS. 7 and 8, when the housing member 41 is located at the closed position, the first portion 53 of the communication portion 40 is closed by the outer peripheral surface of the main body portion 46 of the housing member 41 and the communication portion 40. The second portion 54 is closed by the inner peripheral surface of the inner portion 43 of the fitting hole 42, whereby the communication portion 40 is closed, and the communication between the storage chamber 39 and the liquid chamber 26 is blocked. The communication through the second restriction passages 31 between the 26 is blocked.

As shown in FIG. 3, the drive unit 59 supports the housing member 41 so as to be rotatable around the virtual axis O2. The drive unit 59 is fixed to the outer peripheral surface of the first attachment member 11 and is connected to the shaft portion 49 of the housing member 41 from the outside in the virtual axis O2 direction. As the drive unit 59, for example, a DC motor or the like can be employed.
Here, a control unit (not shown) that controls the drive unit 59 is connected to the drive unit 59. The control unit operates the drive unit 59 in accordance with, for example, the frequency or amplitude of vibration input from the vibration generating unit to the vibration isolator 10. When the vibration isolator 10 is applied to, for example, an automobile, a detection signal such as the speed of the automobile or the number of revolutions of an engine that is a vibration generating part is sent to the control unit. Based on the detection signal, the frequency and amplitude of vibration are determined.

  As shown in FIG. 6, the defining member 27 is configured by combining a pair of divided bodies 60 divided in the imaginary axis O2 direction. Thereby, for example, workability of assembling the accommodating member 41 to the defining member 27 is ensured.

Next, the operation of the vibration isolator 10 configured as described above will be described.
First, when idle vibration or high-frequency vibration is input to the vibration isolator 10 in, for example, the direction of the axis O1 or in the orthogonal direction, the housing member 41 is opened by the drive unit 59 as shown in FIGS. To move the liquid chambers 26 through the second restriction passage 31. Then, the liquid actively passes between the liquid chambers 26 through the second restriction passage 31, and the hydraulic pressure is absorbed by the elastic plate 38, thereby suppressing the increase of the dynamic spring constant. Further, liquid column resonance occurs in the second restriction passage 31 and idle vibration is attenuated, or high-frequency vibration is attenuated by the elastic plate 38.
Next, when shake vibration is input to the vibration isolator 10, as shown in FIGS. 7 and 8, the housing member 41 is moved to the closed position by the drive unit 59, and the liquid passed through the second restriction passage 31. The communication between the chambers 26 is blocked. Then, the liquid moves between the liquid chambers 26 through the first restriction passage 30, and liquid column resonance occurs in the first restriction passage 30, and the shake vibration is attenuated.

As described above, according to the vibration isolator 10 according to the present embodiment, the communication of the second restriction passage 31 and the blocking thereof are switched by moving the housing member 41 by the drive unit 59. When a vibration having a frequency equivalent to the resonance frequency of the first restriction passage 30 is input to 10, the second restriction passage 31 can be blocked with high responsiveness by operating the drive unit 59.
Further, since the communication between the liquid chambers 26 through the second restriction passage 31 is blocked by moving the storage member 41 to the closed position, the storage member 41 is made of a material having higher rigidity than the material forming the elastic plate 38. By forming in this manner, it is possible to effectively receive the hydraulic pressure with the accommodating member 41, and it is possible to easily ensure the blocking state of the second restriction passage 31.
As described above, the attenuation characteristic can be stably exhibited.

Further, since the communication between the liquid chambers 26 through the second restriction passage 31 is blocked by closing the communication portion 40, vibration is input to the vibration isolator 10 in a state where the second restriction passage 31 is blocked. In this case, it is possible to suppress the hydraulic pressure from acting on the elastic plate 38, and the performance of the elastic plate 38 can be easily ensured over a long period of time.
Further, in this way, it is possible to suppress the hydraulic pressure from acting on the elastic plate 38 when vibration is input to the vibration isolator 10 with the second restriction passage 31 blocked. It is also possible to suppress the generation of 38 vibration sounds and improve the quietness.

Further, since the second restriction passage 31 is provided in the defining member 27, the vibration isolator 10 can be downsized.
Furthermore, since the storage chamber 39 is provided in the storage member 41, the vibration isolator 10 can be simplified.
Note that, as in the present embodiment, when the housing member 41 moves between the open position and the closed position by rotating around the virtual axis O2, the space required for the movement of the housing member 41 can be kept small. Thus, the size of the vibration isolator 10 can be further reduced.

  Further, when the housing member 41 is located at the closed position, the first portion 53 of the communication portion 40 is closed by the outer peripheral surface of the housing member 41, and the second portion 54 of the communication portion 40 is fitted into the fitting hole 42. Since the communication portion 40 is closed by being blocked by the inner peripheral surface of the storage chamber 39, the communication between the storage chamber 39 and the liquid chamber 26 can be reliably blocked, and the blocking state of the second restriction passage 31 can be further reduced. It can be easily secured.

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.
For example, in the above embodiment, the two liquid chambers 26 are defined in the first mounting member 11, but three or more liquid chambers 26 may be defined.

In the above-described embodiment, each of the two liquid chambers 26 is configured such that a part of the wall surface is constituted by the elastic member 13. However, the present invention is not limited to this, and a plurality of liquid chambers 26 are included. A part of at least one of the wall surfaces may be constituted by the elastic member 13.
For example, the present invention can also be applied to a vibration isolator that exhibits attenuation characteristics only for an input in the axial direction. That is, the cylindrical first mounting member connected to one of the vibration generating portion and the vibration receiving portion, the second mounting member connected to the other, and the two mounting members are connected together, An elastic body member that closes one end of the mounting member in the axial direction,
The inside of the first mounting member is divided into two liquid chambers along the axial direction by the defining member, and one of the two liquid chambers is located on one end side of the first mounting member. In addition, a part of the wall surface may be a main liquid chamber made of an elastic member, and the other liquid chamber may be a sub liquid chamber in which a part of the wall surface is not made of an elastic member. In this case, for example, a part of the wall surface of the auxiliary liquid chamber may be constituted by a diaphragm.

  In the above-described embodiment, the accommodation member 41 is moved between the open position and the closed position by being rotated around the virtual axis O2. However, the present invention is not limited to this. For example, the virtual axis O2 It is good also as what moves between an open position and a closed position by advancing and retracting to a direction. In this case, for example, a cylinder mechanism or the like can be suitably employed as the drive unit.

  Moreover, in the said embodiment, although the storage chamber 39 of the 2nd restriction | limiting channel | path 31 shall be provided in the storage member 41, it is not restricted to this. For example, the inner portion 43 of the fitting hole 42 in the defining member 27 is used as a storage chamber, the communication portion 40 is configured only by the first portion 53, and the first position 53 is opened. A movable member disposed so as to be movable between a closed position where the one portion 53 is closed may be separately provided, and the drive unit 59 may be configured to support the movable member so as to be movable. Furthermore, in this case, it is possible to dispose the movable member in the first portion 53, the recess 36, or in the accommodation chamber.

  Furthermore, in the said embodiment, although the 2nd restriction | limiting channel | path 31 shall be provided in the definition member 27, it is not restricted to this, For example, you may provide in the 1st attachment member 11.

  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.

DESCRIPTION OF SYMBOLS 10 Vibration isolator 11 1st attachment member 12 2nd attachment member 13 Elastic body member 26 Liquid chamber 27 Definition member 30 1st restriction path 31 2nd restriction path 38 Elastic board 39 Storage chamber 40 Communication part 41 Accommodation member (movable member) )
58 switching means 59 drive unit

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 member for connecting both of these mounting members,
In the first mounting member, a plurality of liquid chambers filled with liquid are defined, and at least one of these liquid chambers is configured such that a part of the wall surface is formed by the elastic body member,
The plurality of liquid chambers communicate with each other through a first restriction passage and a second restriction passage having a resonance frequency higher than that of the first restriction passage,
The second restriction passage is a vibration isolator including a storage chamber in which an elastic plate is stored, and a communication portion that connects the storage chamber and the liquid chamber,
Comprising a switching means for switching between opening and closing of the communication portion,
The switching means is
A movable member movably disposed between an open position for opening the communication portion and a closed position for closing the communication portion;
And a drive unit that movably supports the movable member. The vibration isolator according to claim 1,
The anti-vibration device according to claim 1, wherein the second restriction passage is provided in an defining member that defines the plurality of liquid chambers. The vibration isolator according to claim 1 or 2,
The anti-vibration device according to claim 1, wherein the storage chamber is provided in the movable member.

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