JP2009275749A - Vibration control device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To inhibit cavitation, and to damp and absorb vibration even when large amplitude vibration is input. <P>SOLUTION: When vibration of the amplitude of a threshold or larger is input to an outer cylinder 11 or a mounting member 12 along an axis O direction and the outer cylinder 11 and the mounting member 12 are relatively displaced along the axis O direction and an inside of a main liquid chamber 16 is pressurized, an end 25a of a movable member 25 is abutted to a stopper member 28, and thereby, a partition part 15 is moved to the other end side of the axis O direction. <P>COPYRIGHT: (C)2010,JPO&INPIT

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, as this type of vibration isolator, an outer cylinder connected to one of the vibration generating part and the vibration receiving part, and a vibration generating part and a vibration receiving part that are arranged on the radially inner side of the outer cylinder. An attachment member connected to the other, the attachment member and the outer cylinder are elastically connected, an elastic body for closing one end opening of the outer cylinder, and the other end opening of the outer cylinder are closed. A diaphragm, a liquid sealed space enclosed by the elastic body and the diaphragm inside the outer cylinder, a main liquid chamber having the elastic body as a part of a partition, and a secondary liquid having the diaphragm as a part of a partition There is known a configuration including a chamber and a partition portion formed with an orifice passage that divides the chamber and communicates with each other.
In this vibration isolator, after a large amplitude vibration is input due to unevenness of the road surface and the liquid pressure in the main liquid chamber suddenly rises, there is an input in the opposite direction due to, for example, rebound of the elastic body. Sometimes, the main liquid chamber may become negative pressure. At this time, cavitation in which a large number of bubbles are generated in the liquid in the main liquid chamber occurs. Thereafter, a shock wave is generated when bubbles disappear from the liquid as the liquid pressure in the main liquid chamber rises, and abnormal noise may be generated from the vibration isolator due to the shock wave.
As means for preventing the occurrence of such abnormal noise, for example, as shown in Patent Document 1 below, a configuration in which a restricting member that restricts deformation of a diaphragm is provided is known. By providing this restricting member, when large-amplitude vibration is input to the vibration isolator, the expansion and deformation of the diaphragm is restricted to prevent the liquid from flowing from the main liquid chamber to the sub liquid chamber. By increasing the fluid pressure, even if the fluid pressure in the main fluid chamber decreases due to subsequent rebound or the like, it is possible to prevent the fluid pressure from decreasing to an extent that causes cavitation.
JP 2008-2629 A

  However, in the conventional vibration isolator, since it is difficult for the liquid to flow from the main liquid chamber to the sub liquid chamber when a large amplitude vibration is input, it is difficult to generate a liquid column resonance phenomenon. Since the liquid pressure in the main liquid chamber is increased, the elastic body constituting a part of the partition wall of the main liquid chamber is hardened, and it may be difficult to attenuate and absorb this vibration.

  The present invention has been made in consideration of such circumstances, and can prevent the occurrence of cavitation. Further, even when a large amplitude vibration is input, the present invention can prevent and absorb this vibration. An object is to provide a vibration device.

  In order to solve the above problems and achieve such an object, the vibration isolator of the present invention includes an outer cylinder connected to one of the vibration generating part and the vibration receiving part, and the radial direction of the outer cylinder A mounting member disposed on the inner side and connected to one of the vibration generating unit and the vibration receiving unit, and elastically connecting the mounting member and the outer cylinder and closing one end opening of the outer cylinder A main body, a diaphragm closing the other end opening of the outer cylinder, and a liquid-filled space enclosed by the elastic body and the diaphragm inside the outer cylinder, the main liquid having the elastic body as a part of the partition wall An anti-vibration device comprising: a chamber; and a partition portion in which an orifice passage is formed to divide the diaphragm into a sub-liquid chamber having a diaphragm as a part of a partition wall, and to connect the two liquid chambers to each other; In the liquid enclosure space, the mounting portion And a movable member connected to at least one of the elastic bodies and extending toward the other end side in the axial direction of the outer cylinder, and connected to the partition portion and on the other end side in the axial direction of the movable member A stopper member opposed to the other end side in the axial direction is disposed at the distal end portion, and vibrations having an amplitude greater than or equal to a threshold value along the axial direction are input to the outer cylinder or the mounting member. And when the attachment member is relatively displaced along the axial direction to pressurize the main liquid chamber, the tip of the movable member comes into contact with the stopper member, so that the partition portion is in the axial direction. It is configured to be moved toward the other end side.

In the present invention, vibration having an amplitude greater than or equal to a threshold value along the axial direction is input to the outer cylinder or the mounting member, and the outer cylinder and the mounting member are relatively displaced along the axial direction to move the main liquid. When the interior is pressurized, the partition portion is moved toward the other end side in the axial direction by the front end portion of the movable member coming into contact with the stopper member. At this time, the internal volume of the main liquid chamber increases, so that the internal volume of the liquid in the main liquid chamber can be increased. Therefore, after this, for example, when the outer cylinder and the mounting member are relatively displaced along the axial direction in the opposite direction due to rebounding of the elastic body, for example, the negative pressure in the main liquid chamber is suppressed. Therefore, the occurrence of cavitation in the main liquid chamber can be suppressed.
In addition, when the partition portion is moved toward the other end side in the axial direction as described above, the internal volume of the main liquid chamber increases, so that an increase in the internal pressure is suppressed and clogging occurs in the orifice passage. It becomes difficult to occur. Therefore, the liquid column resonance phenomenon can be generated and the flexibility of the elastic body can be maintained, and the above-described vibration can be surely attenuated and absorbed.
As described above, the occurrence of cavitation can be suppressed, and even when a large amplitude vibration is input, the vibration can be attenuated and absorbed.
Furthermore, as described above, since the increase in the internal pressure of the main liquid chamber can be suppressed by increasing the internal volume of the main liquid chamber, a member such as a partition disposed in the outer cylinder increases the internal pressure of the main liquid chamber. Therefore, it is possible to suppress the generation of abnormal noise by wobbling and colliding with the inner peripheral surface of the outer cylinder.

  Here, a ring member formed of a resin material or a metal material is embedded in the outer peripheral edge portion of the diaphragm, and the ring member is fitted into the other end opening of the outer cylinder, and the ring member and the partition The part may sandwich a first buffer member formed in a ring shape with a rubber-like elastic material in the axial direction.

  In this case, since the ring member and the partitioning portion sandwich the first buffer member formed in a ring shape with a rubber-like elastic material in the axial direction, the outer cylinder or the mounting member has an amplitude greater than the threshold value as described above. When this vibration is input, the partition portion moves toward the other end side in the axial direction while compressing and deforming the first buffer member. Therefore, by adopting the configuration in which the partition portion is moved as described above, it is possible to prevent the partition portion and the ring member from colliding with each other and to generate abnormal noise. When is input, it is possible to make it difficult to operate the partition portion.

  The movable member is disposed through the partition portion so that a tip end portion thereof is located in the sub liquid chamber, and the movable member extends along the axial direction between the partition portion and the movable member. And a seal ring that is movably and liquid-tightly inserted, and a second buffer member that is formed in a ring shape with a rubber-like elastic material and covers the seal ring from the outside in the radial direction. .

In this case, since the movable member is disposed through the partition portion, vibration having an amplitude equal to or greater than the threshold value along the axial direction is input to the outer cylinder or the mounting member, and the outer cylinder and the mounting member are relatively Therefore, when the main liquid chamber is depressurized by being displaced along the axial direction, the displacement of the main liquid chamber can be regulated by bringing the tip of the movable member into contact with the partition portion. The occurrence of cavitation can be suppressed by suppressing the negative pressure in the room.
Further, since this movable member is inserted in a seal ring disposed between the partition portion and movably along the axial direction in a liquid-tight manner, the main liquid chamber and the sub liquid chamber are short-circuited. Therefore, it is possible to prevent the desired attenuation performance from becoming difficult to obtain.
Furthermore, since the second buffer member is provided between the partition portion and the movable member, vibration along, for example, the radial direction other than the axial direction is input to the outer cylinder or the mounting member, and follows this. When the movable member and the partition portion try to move relative to each other, even if a large load is applied to the movable member by restraining this movement, the load is reduced by the second buffer member. It becomes possible to relieve, and damage to the movable member can be suppressed.

  According to the present invention, the occurrence of cavitation can be suppressed, and even when a large amplitude vibration is input, this vibration can be attenuated and absorbed.

  Hereinafter, an embodiment of a vibration isolator according to the present invention will be described with reference to FIGS. 1 and 2. The vibration isolator 10 includes an outer cylinder 11 connected to one of the vibration generating part and the vibration receiving part, and is arranged on the radially inner side of the outer cylinder 11, and either the vibration generating part or the vibration receiving part. An attachment member 12 connected to the elastic member 13, an elastic body 13 that elastically connects the attachment member 12 and the outer cylinder 11, and closes one end opening of the outer cylinder 11, and the other end opening of the outer cylinder 11. The diaphragm 14 to be closed, the liquid sealing spaces 16 and 17 closed by the elastic body 13 and the diaphragm 14 inside the outer cylinder 11, and the main liquid chamber 16 and the diaphragm 14 having the elastic body 13 as a part of the partition wall And a partition portion 15 that divides the sub liquid chamber 17 into a part of the sub liquid chamber 17.

Each of these members is arranged with its center axis positioned on a common axis. Hereinafter, this common axis is referred to as an axis O, and a direction along the axis O is referred to as an up-down direction. Further, one axial end of the outer cylinder 11 is the lower side, and the other axial end of the outer cylinder 11 is the other. The side is called the upper side.
The liquid enclosure spaces 16 and 17 are filled with, for example, ethylene glycol, water, or silicone oil. Furthermore, the internal volume of the main liquid chamber 16 changes as the elastic body 13 is deformed, and the internal volume of the sub liquid chamber 17 changes due to the deformation of the diaphragm 14 according to the pressure change of the sealed liquid. It has become.
When the vibration isolator 10 is mounted on, for example, an automobile, the attachment member 12 is connected to an engine as a vibration generating unit, while the outer cylinder 11 is connected to a vehicle body as a vibration receiving unit via a bracket B. Used.

The outer cylinder 11 includes a lower small-diameter portion 11a, an upper large-diameter portion 11b, and a step portion 11c that couples the small-diameter portion 11a and the large-diameter portion 11b. For example, a metal material or the like is formed integrally with O.
Further, in the illustrated example, the mounting member 12 is provided with a cylindrical body 12a having an internal thread portion formed on the inner peripheral surface thereof, and projecting outward in the axial direction on the other axial end surface of the cylindrical body 12a. And a wall portion 12b. The cylindrical body 12 a is provided coaxially with the axis O in a state in which one end in the axial direction protrudes below the lower end opening surface of the outer cylinder 11.

The elastic body 13 includes a portion located inside the outer cylinder 11 in the cylindrical body 12a, a block-shaped main body portion 13a in which the wall portion 12b is embedded, and a radially outer side from the outer peripheral side of the cylindrical body 12a. A leg portion 13b that gradually extends downward as it goes in the direction, and a covering portion 13c that extends upward from the tip of the leg portion 13b along the inner circumferential surface of the outer cylinder 11, and these 13a to 13c are provided. For example, it is integrally formed with a rubber-like elastic material or the like.
Among these, the tip of the leg portion 13 b is vulcanized and bonded to the inner peripheral surface of the lower end portion of the outer cylinder 11. Further, the covering portion 13c is vulcanized and bonded to the entire area of the inner peripheral surface of the outer cylinder 11 where the tip of the leg portion 13b is not vulcanized and bonded. Thereby, the inner peripheral surface of the outer cylinder 11 is covered with the tip of the leg portion 13b and the covering portion 13c over the entire area.

The partition portion 15 includes an orifice member 19 in which an orifice passage 19 a that communicates the main liquid chamber 16 and the sub liquid chamber 17 is formed, a first partition plate 21 that is spaced apart from each other in the vertical direction, and a second partition plate 21. A partition plate 22 and a movable plate 18 disposed between the partition plates 21 and 22 are provided.
In the illustrated example, the first partition plate 21 is disposed on the main liquid chamber 16 side, and the second partition plate 22 is disposed on the sub liquid chamber 17 side, and faces the movable plate 18 in each partition plate 21, 22. A plurality of flow holes 23 are formed at the positions to be operated. In addition, the movable plate 18 is formed in a disk shape with a rubber-like elastic material.
Here, the orifice member 19 is formed in a ring shape, and the outer peripheral surface of the first partition plate 21 is connected to the inner peripheral surface thereof. The orifice member 19 and the first partition plate 21 are made of, for example, a metal material or a synthetic resin. It is integrally formed of materials.

 The orifice passage 19a is formed on the outer peripheral surface of the orifice member 19 and is an annular groove extending along the circumferential direction. Of the wall portions defining the orifice passage 19a, the one end side wall portion 19b located on the lower side and the other end side wall portion 19c located on the upper side communicate with the orifice passage 19a and the main liquid chamber 16, respectively. A first passage 19f and a second passage 19g that communicates the orifice passage 19a and the auxiliary liquid chamber 17 are formed separately, and the main liquid chamber 16 and the second passage 19g are formed through the orifice passage 19a, the first passage 19f, and the second passage 19g. The secondary liquid chamber 17 is in communication.

  Further, the orifice member 19 is caulked by the upper end portion of the outer cylinder 11 being bent radially inward in a state where the orifice member 19 is disposed in a portion connected to the step portion 11c on the inner peripheral surface of the large diameter portion 11b of the outer cylinder 11. By forming 11d, it is fixed between the inner surface of the caulking portion 11d and the step portion 11c. The caulking portion 11d is reduced in diameter from the lower side toward the upper side.

  Diaphragm 14 is formed in a reverse bowl shape that bulges upward from the upper end opening surface of outer cylinder 11, and ring member 20 formed of a resin material or a metal material is embedded in the lower end opening (outer peripheral edge) thereof. Has been. The diaphragm 14 closes the upper end opening of the outer cylinder 11 by fitting the ring member 20 into the upper end opening of the outer cylinder 11. In the illustrated example, the ring member 20 is fitted in the caulking portion 11 d of the outer cylinder 11.

  And in this embodiment, the ring member 20 and the partition part 15 are inserting | pinching the 1st buffer member 24 formed in the ring shape with the rubber-like elastic material in the said axis line O direction. The first buffer member 24 is sandwiched between the lower end of the ring member 20 and the upper surface of the other end side wall portion 19c of the orifice member 19 while being compressed and deformed in the direction of the axis O. In addition, the thickness of the 1st buffer member 24 is thicker than the coating | coated part 13c. Moreover, the 1st buffer member 24 is not formed integrally with the coating | coated part 13c and the diaphragm 14, but is a different body. That is, the first buffer member 24 is fixed by being sandwiched in the direction of the axis O by the lower end of the ring member 20 and the other end side wall portion 19c of the orifice member 19.

 Further, in the present embodiment, a movable member 25 connected to at least one of the attachment member 12 and the elastic body 13 and extending upward is disposed in the liquid sealing spaces 16 and 17. In the illustrated example, the movable member 25 has a proximal end connected to a connecting portion between the cylindrical body 12a and the wall portion 12b of the attachment member 12, and is coaxial with the axis O and extends in the direction of the axis O. Is formed. The movable member 25 extends in the main body 13a of the elastic body 13 along the axis O direction, and is vulcanized and bonded to the main body 13a. As described above, in the illustrated example, the movable member 25 is connected to both the attachment member 12 and the elastic body 13.

  Furthermore, the movable member 25 is disposed through the partition portion 15 so that the tip end portion thereof is located in the auxiliary liquid chamber 17. In the illustrated example, in the partition portion 15, a through hole is formed on the first partition plate 21, the second partition plate 22, and the movable plate 18 on the same axis as the axis O, and is movable in the through hole. The member 25 is inserted. That is, the movable member 25 extends from the base end side along the axis O direction and reaches the sub liquid chamber 17 through the through hole. A flange portion 25a projects from the distal end portion of the movable member 25 located in the auxiliary liquid chamber 17 toward the radially outer side.

Further, in the present embodiment, a seal ring 26 in which the movable member 25 is movably and liquid-tightly inserted along the direction of the axis O between the through hole of the partition portion 15 and the movable member 25; A second buffer member 27 that is formed in a ring shape with a rubber-like elastic material and covers the seal ring 26 from the outside in the radial direction is provided. In the illustrated example, the outer peripheral surface of the seal ring 26 and the inner peripheral surface of the second buffer member 27 are bonded. Further, the outer peripheral surface of the second buffer member 27 is bonded to each inner peripheral surface of a portion formed in the first partition plate 21 and the second partition plate 22 in the through hole of the partition portion 15.
As described above, the liquid tightness between the movable member 25 and the seal ring 26, between the seal ring 26 and the second buffer member 27, and between the second buffer member 27 and the through hole of the partition portion 15, respectively. It is kept separately.

  Further, in the present embodiment, a stopper member 28 is provided in the liquid enclosure spaces 16 and 17, connected to the partition portion 15, and opposed to the flange portion 25 a of the movable member 25 from above. In the illustrated example, the stopper member 28 includes a cylindrical main body portion 28a and a top wall portion 28b that closes the upper end opening of the main body portion 28a, and these 28a and 28b are bonded to each other to form a topped cylindrical shape. ing. The lower end edge of the main body 28 a of the stopper member 28 is adhered to the upper end surface of the seal ring 26 or the upper end surface of the second buffer member 27 and is arranged coaxially with the axis O.

 Further, the distal end portion of the movable member 25 and the flange portion 25a are disposed inside the stopper member 28, and the upper surface of the flange portion 25a and the lower surface of the top wall portion 28b are opposed in the direction of the axis O. . The tip of the movable member 25 is fitted in a guide hole formed in the top wall portion 28b of the stopper member 28 so as to be movable up and down. Furthermore, a rubber-like elastic member (not shown) is disposed on at least one of the upper surface of the flange portion 25a and the lower surface of the top wall portion 28b.

  As described above, according to the vibration isolator 10 according to the present embodiment, vibration having an amplitude equal to or greater than a threshold value (for example, about 3 mm) along the axis O direction is input to the outer cylinder 11 or the mounting member 12. When the outer cylinder 11 and the mounting member 12 are relatively displaced along the direction of the axis O and the inside of the main liquid chamber 16 is pressurized, the flange portion 25a of the movable member 25 becomes the top wall of the stopper member 28. The upper surface of the other end side wall portion 19c of the orifice member 19 is compressed in the direction of the axis O between the lower end of the ring member 20 by abutting against the portion 28b and pushing up the top wall portion 28b. While being deformed, the entire partition 15 is integrally moved upward.

  At this time, the internal volume of the main liquid chamber 16 increases, so that the internal volume of the liquid in the main liquid chamber 16 can be increased. Therefore, when the outer cylinder 11 and the mounting member 12 are relatively displaced along the axis O direction in the opposite direction due to, for example, rebound of the elastic body 13 thereafter, the main liquid chamber 16 becomes negative pressure. It is possible to suppress the occurrence of cavitation in the main liquid chamber 16.

In addition, when the partition portion 15 is moved upward as described above, the internal volume of the main liquid chamber 16 increases, so that an increase in the internal pressure is suppressed and clogging is less likely to occur in the orifice passage 19a. Therefore, the liquid column resonance phenomenon can be generated and the flexibility of the elastic body 13 can be maintained, and the above-described vibration can be reliably damped and absorbed.
As described above, the occurrence of cavitation can be suppressed, and even when a large amplitude vibration is input, the vibration can be attenuated and absorbed.
Further, as described above, since the increase in the internal pressure of the main liquid chamber 16 can be suppressed by increasing the internal volume of the main liquid chamber 16, members such as the partition portion 15 disposed in the outer cylinder 11 are used as the main liquid. It is possible to suppress the generation of abnormal noise by wobbling due to an increase in the internal pressure of the chamber 16 and colliding with the inner peripheral surface of the outer cylinder 11.

Further, in the present embodiment, the ring member 20 and the partition portion 15 sandwich the first buffer member 24 formed in a ring shape with a rubber-like elastic material in the direction of the axis O, so that the outer cylinder 11 or the attachment member 12 In addition, as described above, when the vibration having the amplitude greater than or equal to the threshold value is input, the partition portion 15 moves upward while compressing and deforming the first buffer member 24.
Therefore, by adopting the configuration in which the partition portion 15 is moved as described above, it is possible to prevent the partition portion 15 and the ring member 20 from colliding with each other and to generate abnormal noise, and the vibration isolator 10 is shaken. When vibration (for example, frequency is 8 Hz to 17 Hz and amplitude is ± 0.5 mm or more) or idle vibration (for example, frequency is 18 Hz to 40 Hz and amplitude is ± 0.2 mm or less), the partition unit 15 is operated. Can be difficult.

Furthermore, in the present embodiment, the movable member 25 is inserted in a seal ring 26 disposed in the through hole of the partition portion 15 so as to be movable and liquid-tight along the direction of the axis O. By disposing the movable member 25 through the partition portion 15, it is possible to prevent the main liquid chamber 16 and the sub liquid chamber 17 from communicating with each other in a short circuit so that it is difficult to obtain desired damping performance. it can.
Furthermore, since the second buffer member 27 is provided in the through hole of the partition portion 15, vibration along, for example, the radial direction other than the direction of the axis O is input to the outer cylinder 11 or the attachment member 12. When the movable member 25 and the partition portion 15 try to move relative to each other, the movements restrain each other so that even if a large load is applied to the movable member 25, the load is reduced. It becomes possible to relieve by the 2 buffer member 27, and damage to the movable member 25 can be suppressed.

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-described embodiment, the suspension type vibration isolator 10 that is mounted and used so that the main liquid chamber 16 is located on the lower side and the sub liquid chamber 17 is located on the upper side is shown. The present invention is not limited to this, and the present invention can also be applied to a compression type vibration isolator that is attached and used so that the main liquid chamber 16 is positioned on the upper side and the sub liquid chamber 17 is positioned on the lower side.

  Further, instead of the partition portion 15, for example, the first partition plate 21 that does not have the movable plate 18 and the second partition plate 22 and is not formed with the flow hole 23, and the orifice member 19 are integrally formed. Configuration, or configuration having an orifice member 19 formed in a ring shape without the first partition plate 21 and the second partition plate 22 and a rubber-like elastic plate disposed so as to close the inside thereof May be adopted.

Furthermore, in the said embodiment, although the structure connected to both the attachment member 12 and the elastic body 13 as the movable member 25 was shown, the structure connected only to either one of these 12 and 13 is employ | adopted. Also good.
In the embodiment, the through hole is formed in the first partition member 21, the second partition member 22, and the movable plate 18 in the partition portion 15, but the tip of the movable member 25 is not formed without forming the through hole. The side portion and the flange portion 25 a may be positioned in the main liquid chamber 16. Further, the entire partition portion 15 may be pushed up by the distal end surface of the movable member 25 without providing the flange portion 25a.

Further, the ring member 20, the first buffer member 24, the seal ring 26, and the second buffer member 27 may not be provided.
Furthermore, a buffer member formed in a ring shape with a rubber-like elastic material is disposed inside the outer cylinder 11 between the step portion 11c and the lower surface of the one end side wall portion 19b of the orifice member 19, and this buffer member. May be sandwiched between the step 11c of the outer cylinder 11 and the one end side wall 19b of the orifice member 19 in the direction of the axis O.
In this case, when the entire partition portion 15 moves upward as described above and then returns to the original position, the lower surface of the one end side wall portion 19b of the orifice member 19 is in the step portion 11c of the outer cylinder 11. It is possible to prevent the generation of noise due to collision with the inner surface.

Further, in the above-described embodiment, vibration having an amplitude equal to or greater than a threshold value along the direction of the axis O is input to the outer cylinder 11 or the mounting member 12, and the outer cylinder 11 and the mounting member 12 are relatively moved in the direction of the axis O. When the inside of the main liquid chamber 16 is depressurized and the pressure is reduced, the flange portion (tip portion) 25a of the movable member 25 is brought into contact with the seal ring 26 and the second buffer member 27 of the partition portion 15. This displacement may be restricted.
In this case, the negative pressure in the main liquid chamber 16 can be more reliably suppressed, and the occurrence of cavitation can be further suppressed.

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

  The occurrence of cavitation can be suppressed, and even when a large amplitude vibration is input, the vibration can be attenuated and absorbed.

It is a longitudinal section of a vibration isolator shown as one embodiment concerning the present invention. In the vibration isolator shown in FIG. 1, it is a partial longitudinal cross-sectional view which shows the state by which the partition part was pushed up by the movable member.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Vibration isolator 11 Outer cylinder 12 Mounting member 13 Elastic body 14 Diaphragm 15 Partition part 16 Main liquid chamber 17 Sub liquid chamber 18 Movable plate 19a Orifice passage 20 Ring member 24 1st buffer member 25 Movable member 25a Flange part (tip part)
26 Seal ring 27 Second buffer member 28 Stopper member O Axis (shaft)

Claims (3)

An outer cylinder coupled to one of the vibration generator and the vibration receiver;
A mounting member that is disposed on the radially inner side of the outer cylinder and connected to either the vibration generating unit or the vibration receiving unit,
An elastic body that elastically connects the mounting member and the outer cylinder, and closes one end opening of the outer cylinder;
A diaphragm for closing the other end opening of the outer cylinder;
Inside the outer cylinder, a liquid sealed space closed by the elastic body and the diaphragm, a main liquid chamber having the elastic body as a part of a partition, a sub liquid chamber having the diaphragm as a part of a partition, And a partition portion formed with an orifice passage that communicates the two liquid chambers with each other.
The liquid sealed space is connected to at least one of the attachment member and the elastic body and extends toward the other end side in the axial direction of the outer cylinder, and is connected to the partition portion and is movable. A stopper member facing from the other end side in the axial direction to a tip portion on the other end side in the axial direction of the member,
A vibration having an amplitude equal to or greater than a threshold value along the axial direction is input to the outer cylinder or the mounting member, and the outer cylinder and the mounting member are relatively displaced along the axial direction to add the main liquid chamber. The anti-vibration device according to claim 1, wherein the partition portion is moved toward the other end side in the axial direction when the distal end portion of the movable member abuts against the stopper member when pressed. The vibration isolator according to claim 1,
A ring member formed of a resin material or a metal material is embedded in the outer peripheral edge of the diaphragm, and the ring member is fitted into the other end opening of the outer cylinder,
The vibration isolator, wherein the ring member and the partition portion sandwich a first buffer member formed in a ring shape with a rubber-like elastic material in the axial direction. The vibration isolator according to claim 1 or 2,
The movable member is disposed through the partition portion so that a tip end portion thereof is located in the auxiliary liquid chamber, and the movable member moves along the axial direction between the partition portion and the movable member. A seal ring that is freely and liquid-tightly inserted, and a second buffer member that is formed in a ring shape with a rubber-like elastic material and covers the seal ring from the outside in the radial direction are provided. Anti-vibration device.

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