JP6483482B2 - Vibration isolator - Google Patents

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.

  As this type of vibration isolator, for example, a configuration as shown 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 partition member that divides the body and the liquid chamber in the first mounting member enclosing the liquid into a first liquid chamber and a second liquid chamber whose elastic body is part of the wall surface; and a partition member And a movable member accommodated in the accommodating chamber. The partition member is formed with an opening that extends from the exposed surface exposed to the first liquid chamber or the second liquid chamber in the partition member toward the inside in the orthogonal direction orthogonal to the exposed surface and opens toward the movable member. ing.

JP 2006-97824 A

  However, in the conventional vibration isolator, there is room for improvement in suppressing the occurrence of hitting sound between the movable member and the partition member due to excessive deformation and displacement of the movable member in the orthogonal direction.

  The present invention has been made in view of the above-described circumstances, and an object thereof is to suppress the generation of abnormal noise.

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. A partition member for partitioning an elastic body to be connected, a liquid chamber in the first mounting member in which a liquid is enclosed, a first liquid chamber having the elastic body as a part of a wall surface, and a second liquid chamber; A movable member housed in a housing chamber provided in the partition member, wherein the partition member is exposed from an exposed surface of the partition member exposed to the first liquid chamber or the second liquid chamber. An opening extending toward the inside of the orthogonal direction orthogonal to the surface and opening toward the movable member is formed, and the movable member is accommodated in the accommodating chamber so as to be deformable or displaceable in the orthogonal direction. A vibration isolator, wherein the opening is Of the member, a portion located on the inner side of the outer peripheral edge portion is exposed toward the outer side in the orthogonal direction, and a plurality of beam portions extending along the exposed surface are installed in the opening portion. The beam portion extends in the radial direction of the opening, and is arranged in parallel in the circumferential direction of the opening as a parallel direction along the exposed surface, and the parallel direction between the beam portions adjacent to each other in the parallel direction. A partition hole is formed between the beam side surfaces facing each other, and one of the beam side surfaces is a current-transforming side surface that is inclined with respect to the orthogonal direction so as to face the outside in the orthogonal direction. It is characterized by.

In this case, when the liquid pressure in the first liquid chamber or the second liquid chamber is exerted on the movable member through the opening, the liquid in the first liquid chamber or the liquid in the second liquid chamber passes through the partition hole from the outside in the orthogonal direction. To reach the movable member.
Here, since one of the beam side surfaces facing each other across the partition holes in the parallel direction is a current transformation side surface, when the liquid flows toward the inside in the orthogonal direction through the partition holes, the liquid flow , In the parallel direction along the exposed surface. Therefore, the flow direction of the liquid can be changed in a direction intersecting the orthogonal direction in which the movable member is deformed and displaced, and the flow rate of the liquid is reduced by changing the flow of the liquid, thereby reducing the energy of the liquid. Can be lowered.
In addition, at this time, the flow of the liquid can be changed over a wide range by using the current side surface of the beam portion, and the flow can be changed for a large amount of liquid. As a result, excessive deformation and displacement of the movable member in the orthogonal direction can be suppressed, and generation of abnormal noise can be suppressed.
Also, as described above, since the flow of the liquid can be changed over a wide range using the current-transforming side surface of the beam portion, in the plan view when the exposed surface is viewed from the axial direction while suppressing the occurrence of abnormal noise, The area occupied by the beam with respect to the entire opening can be kept small. Therefore, it is possible to secure a dedicated area of the partition hole with respect to the entire opening, and the characteristics of the vibration isolator can be easily stabilized.
Further, the plurality of beam portions extend in the radial direction of the opening and are arranged in parallel in the circumferential direction of the opening. Therefore, it is possible to partition the same number of openings as the beams in the opening, and it is possible to further ensure the area occupied by the partition hole with respect to the entire opening.

  As the current transformation side surface, at least one set of the current transformation side surface and the other current transformation side surface that face opposite sides in a predetermined linear direction along the exposed surface may be provided.

  In this case, at least one set of one current transformation side surface and the other current transformation side surface which are opposite to each other in a predetermined linear direction along the exposed surface is provided as the current transformation side surface. Therefore, it is possible to change the liquid flow changed by one current-transforming side and the liquid flow changed by the other current-transforming side toward the opposite sides in the above-described linear direction. Thus, for example, the energy of the liquid can be further reduced by offsetting each other's energy.

  Any of the beam side surfaces of each of the plurality of beam portions may be gradually inclined from one side along the circumferential direction toward the other side as going inward in the orthogonal direction.

  In this case, the beam side surfaces in each of the plurality of beam portions are gradually inclined from one side to the other side along the circumferential direction as they go inward in the orthogonal direction. A swirling flow swirling from one side in the circumferential direction toward the other side can be formed by the flow of the liquid. In this swirl flow, the direction of the flow is directed in the opposite direction across the central axis of the opening in the radial direction. The energy can be further reduced.

Each of the plurality of beam portions may be curved or bent so as to protrude in the circumferential direction in a plan view when the exposed surface is viewed from the axial direction of the opening .

  In this case, since each of the plurality of beam portions is curved or bent so as to protrude in the circumferential direction in a plan view when the exposed surface is viewed from the axial direction, it is possible to secure a wider beam side surface of the beam portion. And the flow can be changed for larger quantities of liquid.

  The other of the beam side surfaces may be a guide side surface that is inclined with respect to the orthogonal direction so as to face the inner side of the orthogonal direction.

  In this case, the other side of the beam side surfaces facing each other across the partition holes in the parallel direction is the guide side surface, so when the liquid flows through the partition holes in the orthogonal direction, it changes depending on the current-transforming side surface. The flow of the liquid made can be guided in the same direction by the guide side surface.

  According to the present invention, the occurrence of abnormal noise can be suppressed.

It is a longitudinal cross-sectional view of the vibration isolator which concerns on one Embodiment of this invention. It is the perspective view which looked at the partition member which comprises the vibration isolator shown in FIG. 1 from the one side of the axial direction. It is the top view which looked at the partition member shown in FIG. 2 from the one side of the axial direction. It is the perspective view which looked at the partition member shown in FIG. 2 from the other side of the axial direction. It is a longitudinal cross-sectional view explaining the flow of the liquid in the partition member shown in FIGS.

Next, an embodiment of the present invention will be described with reference to FIGS.
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 liquid chamber 16 that is disposed inside the first mounting member 11 and formed inside the first mounting member 11. And a partition member 26 that divides the main liquid chamber 16a (first liquid chamber) and the sub liquid chamber 16b (second liquid chamber).

Each of these members is provided coaxially with the central axis O. Hereinafter, the direction along the central axis O is referred to as the axial direction (the axial direction of the first mounting member, the axial direction of the opening, the axial direction of the receiving chamber), and the direction orthogonal to the central axis O is the radial direction (first mounting member). , The radial direction of the storage chamber, the radial direction of the opening, and the direction around the central axis O is the circumferential direction (the peripheral direction of the first mounting member, the peripheral direction of the storage chamber, the peripheral direction of the opening) ).
Here, the liquid chamber 16 is divided into the main liquid chamber 16a on one side in the axial direction (upper side in FIG. 1) and the other side in the axial direction (in FIG. 1) by the partition member 26. It is divided into a sub-liquid chamber 16b on the lower side.

The main liquid chamber 16a and the sub liquid chamber 16b are filled with a liquid L such as ethylene glycol, water, or silicone oil.
The vibration isolator 10 is attached to, for example, an automobile and suppresses transmission of engine vibration to the vehicle body. In the vibration isolator 10, the second mounting member 12 is connected to an engine (not shown) as a vibration generating unit, while the first mounting member 11 is connected to a vehicle body as a vibration receiving unit via a bracket (not shown).

The first mounting member 11 connects the first cylinder part 11a formed on one axial side, the second cylinder part 11b formed on the other axial side, and the first cylinder part 11a and the second cylinder part 11b. And a stepped portion 11c. The first cylinder part 11a, the second cylinder part 11b, and the step part 11c are arranged coaxially with the central axis O and are integrally formed. One end of the first mounting member 11 in the axial direction is closed in a liquid-tight state by the elastic body 13, and the other end in the axial direction of the first mounting member 11 is closed in a liquid-tight state by the diaphragm 14. As a result, the liquid L can be sealed inside the first mounting member 11.
The second mounting member 12 is disposed on one axial side of the first cylindrical member 11 a of the first mounting member 11.

  The elastic body 13 is a member made of, for example, a rubber material. The elastic body 13 protrudes from one end in the axial direction of the first mounting member 11 toward one side in the axial direction, and has a truncated cone-shaped deformed portion 13a that is gradually reduced in diameter toward the one side in the axial direction. A covering portion 13b extending from the deformable portion 13a toward the other side in the axial direction along the inner peripheral surface of the first mounting member 11 is provided. The covering portion 13b is vulcanized and bonded to the inner peripheral surface of the first mounting member 11, and the inner peripheral surface of the first mounting member 11 is covered with the elastic body 13 over the entire area. The deformation portion 13a and the covering portion 13b are integrally formed.

  As shown in FIGS. 1 and 2, the partition member 26 is integrally formed of, for example, an aluminum alloy or a resin. The partition member 26 is formed in a disk shape and is fitted in the first mounting member 11 (inside the covering portion 13b). Of the partition member 26, the first exposed surface 15a (exposed surface 15) facing one side in the axial direction faces the main liquid chamber 16a and is exposed to the main liquid chamber 16a, and the partition member 26 is exposed to the main liquid chamber 16a. A part of the partition wall is formed. Of the partition member 26, the second exposed surface 15b (exposed surface 15) facing the other side in the axial direction faces the sub liquid chamber 16b side and is exposed to the sub liquid chamber 16b, and the partition member 26 is the sub liquid chamber. A part of the partition wall 16b is formed. The first exposed surface 15a and the second exposed surface 15b are formed on a plane orthogonal to the central axis O, and the axial direction is a direction orthogonal to the first exposed surface 15a and the second exposed surface 15b (orthogonal direction). It extends to.

  The partition member 26 is provided with a storage chamber 17 and a restriction passage 18. The storage chamber 17 and the restriction passage 18 are independent of each other. The storage chamber 17 is disposed coaxially with the central axis O. The storage chamber 17 is closed over the entire circumference. The restriction passage 18 communicates the main liquid chamber 16a and the sub liquid chamber 16b. The restriction passage 18 extends along the outer circumferential surface of the partition member 26 along the circumferential direction, and is disposed so as to avoid the storage chamber 17. The restriction passage 18 is tuned so that resonance (liquid column resonance) occurs when an engine shake vibration having a frequency of about 10 Hz is input, for example.

  A movable member 19 (movable plate, membrane) is accommodated in the accommodation chamber 17. The movable member 19 is housed in the housing chamber 17 so as to be deformable in the axial direction. The movable member 19 is formed in a plate shape whose front and back surfaces are directed in the axial direction by, for example, a rubber material, and can be elastically deformed. The movable member 19 is deformed in the axial direction according to the pressure difference between the main liquid chamber 16a and the sub liquid chamber 16b.

Here, in the present embodiment, the partition member 26 is further provided with an opening 20 and a plurality of beam portions 21.
The opening 20 extends from the exposed surface 15 toward the inner side in the axial direction, opens toward the movable member 19, and a part of the movable member 19 that is located on the inner side in the radial direction from the outer peripheral edge is the entire region. Exposed to the outside in the axial direction. The opening 20 communicates the storage chamber 17 with the main liquid chamber 16a or the sub liquid chamber 16b separately. In this embodiment, the opening 20 communicates the storage chamber 17 with the main liquid chamber 16a. A first opening 20a that communicates with the storage chamber 17 and the auxiliary liquid chamber 16b.

  Each of the first opening 20a and the second opening 20b is provided coaxially with the central axis O. Both the first opening 20a and the second opening 20b are formed in a circular shape in plan view as viewed from the axial direction. The first opening 20a directly connects the storage chamber 17 and the main liquid chamber 16a in the axial direction, and opens in the storage chamber 17 and the main liquid chamber 16a in the axial direction. The second opening 20b directly connects the storage chamber 17 and the auxiliary liquid chamber 16b in the axial direction, and opens in the storage chamber 17 and the auxiliary liquid chamber 16b in the axial direction.

  As shown in FIGS. 2 to 4, each of the plurality of beam portions 21 extends along the exposed surface 15 and is installed in the opening 20. The beam portion 21 includes a first beam portion 21a provided in the first opening portion 20a and a second beam portion 21b provided in the second opening portion 20b, and the first beam portion is provided. A plurality of 21a are provided in the first opening 20a, and a plurality of second beams 21b are provided in the second opening 20b.

  As shown in FIGS. 2 and 3, the plurality of first beam portions 21a are arranged in parallel in the circumferential direction, which is a parallel direction along the first exposed surface 15a. The plurality of first beam portions 21a extend in the radial direction, and an outer peripheral surface of a first island portion 22a (island portion 22) provided in the first opening portion 20a and an inner peripheral surface of the first opening portion 20a. And is built between. The 1st island part 22a is formed in the disk shape arrange | positioned coaxially with the 1st opening part 20a (center axis line O).

  Each of the plurality of first beam portions 21a is curved so as to protrude in the circumferential direction in a plan view when the first exposed surface 15a is viewed from the axial direction. In the present embodiment, the first beam portion 21a is counterclockwise along the circumferential direction in a plan view (hereinafter referred to as “first plan view”) when the first exposed surface 15a is viewed from one side in the axial direction ( It is curved to project toward the one side.

  The plurality of first beam portions 21a form a first partition hole 23a (partition hole 23) between the beam side surfaces facing each other in the circumferential direction in the first beam portions 21a adjacent in the circumferential direction. The plurality of first beam portions 21a are formed with a plurality of first partition holes 23a in the first opening portion 20a, and the first beam portion 21a and the first beam portion 21a are arranged in the first opening portion 20a along the circumferential direction. The partition holes 23a are alternately arranged. The first partition holes 23a gradually increase in the circumferential direction from the inner side to the outer side in the radial direction.

  Here, one of the beam side surfaces facing each other across the first partition hole 23a in the circumferential direction is a first current transformation side surface 24a (current transformation side surface) that is inclined with respect to the axial direction so as to face the outside in the axial direction. 24), and the other is a first guide side surface 25a (guide side surface 25) that is inclined with respect to the axial direction so as to face the inner side in the axial direction. In the illustrated example, for all the first partition holes 23a, the beam side surface located on the counterclockwise direction of the first partition hole 23a in the first plan view is the first current transformation side surface 24a, and the first plane The side surface of the beam located on the clockwise side (the other side) of the first partition hole 23a as viewed is the first guide side surface 25a.

  The first current transformation side surface 24a and the first guide side surface 25a are both inclined with respect to the axial direction over the entire radial length of the first beam portion 21a. The beam side surfaces in each of the plurality of first beam portions 21a are gradually inclined from the counterclockwise side to the clockwise side in the first plan view along the circumferential direction as they go inward in the axial direction.

  As the first current transformation side surface 24a, at least one set of one first current transformation side surface 24a and the other first current transformation side surface 24a facing each other in the predetermined linear direction along the first exposed surface 15a is provided. Yes. In the illustrated example, one first current transformation side surface 24a and the other first current transformation side surface 24a are first current transformation side surfaces 24a that are separated from each other by a half circumference along the circumferential direction. The pair of first current transformation side surfaces 24a extend along the same straight line (not shown) on the first exposed surface 15a toward the opposite sides in the radial direction across the central axis O. The pair of first current transformation side surfaces 24a face each other in the linear direction along the first exposed surface 15a and orthogonal to the same straight line.

  As shown in FIGS. 2 to 4, the plurality of second beam portions 21b are arranged in the second opening 20b in a state in which the plurality of first beam portions 21a are inverted in the axial direction. As shown in FIG. 4, the plurality of second beam portions 21b are arranged in parallel in the circumferential direction that is a parallel direction along the second exposed surface 15b. The plurality of second beam portions 21b extend in the radial direction, and are between the outer peripheral surface of the second island portion 22b provided in the second opening 20b and the inner peripheral surface of the second opening 20b. It is erected. The 2nd island part 22b is formed in the disk shape arrange | positioned coaxially with the 2nd opening part 20b (center axis line O).

  Each of the plurality of second beam portions 21b is curved so as to protrude in the circumferential direction in a plan view of the second exposed surface 15b viewed from the axial direction. In the present embodiment, the second beam portion 21b is counterclockwise along the circumferential direction (hereinafter referred to as “second planar view”) when the second exposed surface 15b is viewed from the other side in the axial direction (hereinafter referred to as “second planar view”). It is curved to project toward the one side.

  The plurality of second beam portions 21b form second partition holes 23b (partition holes 23) between the beam side surfaces facing each other in the circumferential direction in the second beam portions 21b adjacent in the circumferential direction. The plurality of second beam portions 21b are formed with a plurality of second partition holes 23b in the second opening portion 20b, and the second opening portion 20b and the second beam portion 21b and the second beam portion 21b extend in the circumferential direction. The partition holes 23b are alternately arranged. The second partition holes 23b gradually increase in the circumferential direction from the inner side to the outer side in the radial direction.

  Here, any one of the beam side surfaces facing each other across the second partition hole 23b in the circumferential direction is a second current transformation side surface 24b (current transformation side surface) inclined with respect to the axial direction so as to face the outside in the axial direction. 24), and the other is a second guide side surface 25b (guide side surface 25) that is inclined with respect to the axial direction so as to face the inner side in the axial direction. In the illustrated example, for all the second partition holes 23b, the beam side surface located on the counterclockwise direction of the second partition hole 23b in the second plan view is the second current transformation side surface 24b, and the second plane The side surface of the beam located on the clockwise side (the other side) of the second partition hole 23b as viewed is the second guide side surface 25b.

  The second current transformation side surface 24b and the second guide side surface 25b are both inclined with respect to the axial direction over the entire radial length of the second beam portion 21b. The beam side surfaces of each of the plurality of second beam portions 21b are gradually inclined from the counterclockwise side to the clockwise side in the second plan view along the circumferential direction as they go inward in the axial direction.

  As the second current transformation side surface 24b, at least one set of one second current transformation side surface 24b and other second current transformation side surfaces 24b facing each other in a predetermined linear direction along the second exposed surface 15b are provided. Yes. In the illustrated example, one second current transformation side surface 24b and the other second current transformation side surface 24b are second current transformation side surfaces 24b that are separated from each other by a half circumference along the circumferential direction. The pair of second current transformation side surfaces 24b extend along the same straight line (not shown) on the second exposed surface 15b toward the opposite sides in the radial direction across the central axis O. The pair of second current transformation side surfaces 24b face each other in a linear direction along the second exposed surface 15b and orthogonal to the same straight line.

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

  When vibration having a minute amplitude (for example, ± 0.2 mm or less) (for example, idle vibration having a frequency of around 30 Hz) acts on the vibration isolator 10 and the pressure of the liquid L in the main liquid chamber 16a fluctuates. The movable member 19 is deformed in the axial direction in the storage chamber 17. Thereby, vibration can be absorbed and attenuated. At this time, the amount of liquid L flowing through the partition hole 23 is very small, and almost no sound is generated between the movable member 19 and the wall surface of the storage chamber 17.

  When vibration having a larger amplitude than the above-described minute amplitude (for example, engine shake vibration having a frequency of about 10 Hz) acts on the vibration isolator 10 and the pressure of the liquid L in the main liquid chamber 16a fluctuates. The liquid L flows through the partition hole 23, and the movable member 19 contacts the wall surface of the storage chamber 17 in the partition member 26 to close the opening 20. At this time, the liquid L flows between the main liquid chamber 16a and the sub liquid chamber 16b through the restricting passage 18, and liquid column resonance (resonance) is generated, so that vibration can be absorbed and attenuated. At this time, the movable member 19 comes into contact with the wall surface of the storage chamber 17 in the partition member 26, so that a hitting sound is easily generated.

As described above, according to the vibration isolator 10 according to the present embodiment, one of the beam side surfaces facing each other across the first partition hole 23a in the circumferential direction is the first current transformation side surface 24a. When the liquid L in the main liquid chamber 16a flows through the first partition hole 23a toward the inner side in the axial direction, the flow of the liquid L is changed in the circumferential direction along the first exposed surface 15a. Accordingly, the direction in which the liquid L flows can be changed in a direction intersecting the axial direction in which the movable member 19 deforms, and the energy of the liquid L can be reduced by changing the flow of the liquid L. The flow rate can be lowered. In addition, at this time, the flow of the liquid L can be changed over a wide range using the first current transformation side surface 24a of the first beam portion 21a, and the flow can be changed for a large amount of the liquid L. Thereby, it becomes possible to suppress the excessive deformation | transformation to the axial direction of the movable member 19, and generation | occurrence | production of abnormal noise can be suppressed.
Further, as described above, the flow of the liquid L can be changed over a wide range by using the first current transformation side surface 24a of the first beam portion 21a, so that the first exposed surface 15a is suppressed while suppressing the generation of abnormal noise. When viewed from the axial direction, the area occupied by the first beam portion 21a with respect to the entire first opening portion 20a can be kept small. Therefore, it becomes possible to ensure the exclusive area of the 1st division hole 23a with respect to the whole 1st opening part 20a, and can make the characteristic of the vibration isolator 10 easy to stabilize.

  The plurality of first beam portions 21a extend in the radial direction and are arranged in parallel in the circumferential direction. Therefore, it is possible to partition the same number of first openings 20a as the first beam portions 21a in the first opening 20a, and further secure an exclusive area of the first partition hole 23a with respect to the entire first opening 20a. Can be made easier.

Further, the beam side surfaces in each of the plurality of first beam portions 21a are gradually inclined from the counterclockwise side in the first plan view toward the clockwise side along the circumferential direction as they go inward in the axial direction. Therefore, the flow of the liquid L changed by each of the plurality of first partition holes 23a forms a swirl flow swirling from the counterclockwise direction to the clockwise side in the first plan view along the circumferential direction. Can do. In this swirl flow, the flow direction is opposite in the portion located on the opposite side across the central axis O of the first opening 20a in the radial direction. For example, the mutual energy is offset. Thus, the energy of the liquid L can be further reduced.
Further, as the first current transformation side surface 24a, at least one set of one first current transformation side surface 24a and another first current transformation side surface 24a facing each other in a predetermined linear direction along the first exposed surface 15a is provided. It has been. Accordingly, the flow of the liquid L changed by the first first current transformation side surface 24a and the flow of the liquid L changed by the other first current transformation side surface 24a are opposite to each other in the linear direction. The energy of the liquid L can be further reduced, for example, by canceling each other's energy.

Further, each of the plurality of first beam portions 21a is curved so as to protrude in the circumferential direction in a plan view when the first exposed surface 15a is viewed from the axial direction. It is possible to ensure a wide range, and the flow can be changed for a larger amount of liquid L.
Moreover, since the other of the beam side surfaces facing each other across the first partition hole 23a in the circumferential direction is the guide side surface 25, the liquid L flows through the first partition hole 23a toward the inner side in the axial direction. In addition, the flow of the liquid L changed by the first current transformation side surface 24 a can be guided in the same direction by the guide side surface 25.

Here, in the present embodiment, the plurality of second beam portions 21b are arranged in the second opening portion 20b in a state in which the plurality of first beam portions 21a are inverted in the axial direction. Therefore, when the liquid L in the sub liquid chamber 16b flows through the second partition hole 23b, the above effects can be achieved in the same manner.
In the present embodiment, the beam side surfaces of each of the plurality of first beam portions 21a are gradually directed from the counterclockwise side to the clockwise side in the first plan view along the circumferential direction as they go inward in the axial direction. In addition, the beam side surfaces of each of the plurality of second beam portions 21b gradually move from the counterclockwise side to the clockwise side in the second plan view along the circumferential direction as they go inward in the axial direction. Inclined towards. Therefore, the swirl flow formed by the flow of the liquid L changed by each of the plurality of first partition holes 23a, and the swirl flow formed by the flow of the liquid L changed by each of the plurality of second partition holes 23b, Can be turned in opposite directions. Thereby, the further reduction of the energy of the liquid L can be aimed at.

  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.

  As the movable member 19, a configuration different from that of the above embodiment may be adopted. For example, the movable member 19 may be accommodated in the accommodating chamber 17 so as to be axially displaceable, and the movable member 19 may be accommodated in the accommodating chamber 17 so as to be deformable or displaceable in the axial direction. The configuration can be adopted as appropriate.

  In the said embodiment, although both the 1st beam part 21a and the 2nd beam part 21b are curving so that it may protrude in the circumferential direction, this invention is not limited to this. For example, the first beam portion 21a and the second beam portion 21b may be bent so as to be convex in the circumferential direction, or may not be curved or bent.

  In the above embodiment, either one of the beam side surfaces facing each other across the first partition hole 23a in the circumferential direction is the first current transformation side surface 24a, and the other is the first guide side surface 25a. The present invention is not limited to this. For example, instead of the first guide side surface 25a, a beam side surface extending straight in the axial direction may be employed. Similarly, instead of the second guide side surface 25b, a beam side surface extending straight in the axial direction may be employed.

The plurality of first beam portions 21a extend in the radial direction and are arranged in parallel in the circumferential direction, but the present invention is not limited to this. For example, the first beam portion 21a is formed in a straight line extending in the direction along the first exposed surface 15a and directly connects two locations separated in the circumferential direction on the inner peripheral surface of the first opening 20a. A plurality of the first beam portions 21a may be arranged in parallel in a parallel direction that is a direction along the first exposed surface 15a and orthogonal to the first beam portions 21a, like a blind curtain. Similarly, the second beam portion 21b can be formed linearly.
In this way, when the first beam portion 21a and the second beam portion 21b are formed in a straight line and arranged in parallel, the first current-transition side surface 24a and the second current-transition side surface 24b are arranged in a parallel direction (linear direction). ) At least one set of one first current transformation side surface 24a and the other first current transformation side surface 24a, one second current transformation side surface 24b and another second current transformation side surface 24b facing each other. It does not have to be provided.

  In the said embodiment, the case where the 2nd attachment member 12 and an engine were connected and the 1st attachment member 11 and a vehicle body were connected was demonstrated. However, the present invention is not limited to this, and may be configured to be connected in reverse, or the vibration isolator 10 may be installed in another vibration generating unit and vibration receiving unit.

  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.

10 Vibration isolator 11 First mounting member 12 Second mounting member 13 Elastic body 15 Exposed surface 16 Liquid chamber 16a Main liquid chamber (first liquid chamber)
16b Secondary liquid chamber (second liquid chamber)
17 accommodating chamber 19 movable member 20 opening portion 21 beam portion 23 partition hole 24 current transformation side surface 25 guide side surface 26 partition member L liquid

Claims (5)

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 that divides the liquid chamber in the first mounting member, in which the liquid is enclosed, into a first liquid chamber and a second liquid chamber in which the elastic body is a part of a wall surface;
A movable member housed in a housing chamber provided in the partition member,
The partition member extends from an exposed surface exposed to the first liquid chamber or the second liquid chamber in the partition member toward an inner side in an orthogonal direction orthogonal to the exposed surface, and opens toward the movable member. An opening is formed,
The movable member is a vibration isolator accommodated in the accommodating chamber so as to be deformable or displaceable in the orthogonal direction,
The opening portion exposes a portion of the movable member located on the inner side of the outer peripheral edge portion toward the outer side in the orthogonal direction,
A plurality of beam portions extending along the exposed surface are installed in the opening,
The plurality of beam portions extend in the radial direction of the opening portion, and are arranged in parallel in the circumferential direction of the opening portion as a parallel direction along the exposed surface. In the beam portions adjacent to each other in the parallel direction, A partition hole is formed between the beam side surfaces facing in the parallel direction,
Any one of the beam side surfaces is a current transformation side surface that is inclined with respect to the orthogonal direction so as to face the outside in the orthogonal direction.   The at least one set of the current transformation side surface and the other current transformation side surface, which face each other in the predetermined linear direction along the exposed surface, are provided as the current transformation side surface. 1. The vibration isolator according to 1. Both beams side in the plurality of beam portions, respectively, gradually toward the inner side of the perpendicular direction, according to claim 1 or 2, characterized in that it is inclined toward the other side from one side along the circumferential direction The vibration isolator as described. Each of the plurality of beam portions in a plan view viewed the exposed surface in the axial direction of the opening, claims 1 to 3, characterized in that the curved or bent such that the collision in the circumferential direction The vibration isolator according to any one of the above.   The other side of said beam side surfaces is a guide side surface which inclines with respect to the said orthogonal direction so that it may face the inner side of the said orthogonal direction, The any one of Claim 1 to 4 characterized by the above-mentioned. Anti-vibration device.

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