JP7161842B2 - Anti-vibration device - Google Patents

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an anti-vibration device that is applied to, for example, automobiles, industrial machinery, etc., and that absorbs and attenuates vibrations of vibration-generating parts such as engines.

As a vibration isolator of this type, conventionally, a cylindrical first mounting member connected to one of the vibration generating portion and the vibration receiving portion, and a second cylindrical mounting member connected to the other, are used. an elastic body for elastically connecting the mounting member; , a liquid-filled type anti-vibration device is known in which a restricted passage is formed for communicating a first liquid chamber and a second liquid chamber.
In this anti-vibration device, when vibration is input, both mounting members are relatively displaced while elastically deforming the elastic body, thereby varying the liquid pressure in at least one of the first liquid chamber and the second liquid chamber, thereby opening the restriction passage. Vibration is absorbed and damped by circulating the liquid in the

By the way, in this anti-vibration device, a large load (vibration) is input from, for example, unevenness of the road surface. , the pressure in the first liquid chamber may be rapidly reduced to negative pressure. Then, cavitation occurs in which a large number of bubbles are generated in the liquid due to this sudden negative pressure, and abnormal noise may occur due to cavitation collapse in which the generated bubbles collapse.
Therefore, by providing a valve element in the restricted passage, for example, as in the vibration isolator disclosed in Patent Document 1 below, even when vibrations with a large amplitude are input, the pressure in the first liquid chamber is reduced to negative pressure. is known.

JP 2012-172832 A

However, the conventional anti-vibration device has a complicated structure due to the provision of the valve body, and tuning of the valve body is required, resulting in an increase in manufacturing cost. In addition, the provision of the valve body reduces the degree of freedom in design, and as a result, there is a possibility that the anti-vibration characteristics will deteriorate.

SUMMARY OF THE INVENTION It is an object of the present invention to provide an anti-vibration device capable of suppressing the occurrence of abnormal noise caused by collapse of cavitation with a simple structure without degrading anti-vibration characteristics. do.

In order to solve the above-described problems, the vibration isolator of the present invention provides a cylindrical first mounting member connected to one of the vibration generating section and the vibration receiving section, and a second cylindrical mounting member connected to the other. a member, an elastic body that elastically connects both mounting members, and a partition member that divides the liquid chamber in the first mounting member containing the liquid into a first liquid chamber and a second liquid chamber. a liquid-filled type vibration isolator in which the partition member is formed with a limiting passage communicating between the first liquid chamber and the second liquid chamber, wherein the limiting passage corresponds to the first liquid chamber a first communicating portion that opens to the second liquid chamber; a second communicating portion that opens to the second liquid chamber; At least one of the second communicating portions has a surface facing the first liquid chamber or the second liquid chamber and includes a plurality of pores passing through a barrier defining the main flow path. , a protrusion projecting toward the first liquid chamber or the second liquid chamber is formed on the peripheral edge of the opening of the pore on the surface of the barrier, In a plan view, the inner peripheral surface of the projection has a similar shape to the inner peripheral surface of the pore.

According to the present invention, when vibration is input, both mounting members are relatively displaced while elastically deforming the elastic body, and the hydraulic pressure in at least one of the first liquid chamber and the second liquid chamber fluctuates. Then, the liquid tries to flow between the first liquid chamber and the second liquid chamber through the restricted passage. At this time, the liquid flows into the restricted passage through one of the first communicating portion and the second communicating portion, passes through the body flow path, and then flows through the other of the first communicating portion and the second communicating portion to the restricted passage. flow out from
Here, when the liquid flows from the main flow channel into the first liquid chamber or the second liquid chamber through the plurality of pores, the liquid flows through each of the pores while being pressure-lossed by the barriers in which these pores are formed. Therefore, the flow velocity of the liquid flowing into the first liquid chamber or the second liquid chamber can be suppressed.

Moreover, since the liquid flows not through a single pore but through a plurality of pores, it becomes possible to circulate the liquid by branching into a plurality of pores, thereby reducing the flow velocity of the liquid that has passed through each of the pores. can be done. As a result, even if a large load (vibration) is input to the vibration isolator, the liquid that has passed through the pores and flowed into the first liquid chamber or the second liquid chamber and the liquid inside the first liquid chamber or the second liquid chamber It is possible to suppress the flow velocity difference occurring between the liquid of , and suppress the generation of vortices due to the flow velocity difference and the generation of bubbles due to the vortices.
Further, even if bubbles are generated in the main flow channel instead of the first liquid chamber or the second liquid chamber, the generated bubbles can be separated from each other in the first liquid chamber or the second liquid chamber by allowing the liquid to pass through a plurality of pores. It becomes possible to separate them in the two-liquid chamber, and it is possible to prevent the bubbles from joining and growing and to easily maintain the finely dispersed state of the bubbles.

In addition, a protrusion protruding toward the first liquid chamber or the second liquid chamber has an inner peripheral surface similar to the inner peripheral surface of the pore in plan view on the peripheral edge of the opening of the pore on the surface of the barrier. part is formed. For this reason, the liquid can flow into the first liquid chamber or the second liquid chamber through the pores while flowing along the inner peripheral surface of the protrusion, and the liquid flows at the periphery of the opening of the pores on the surface of the barrier. In addition, it is possible to suppress the velocity of the liquid flowing into the first liquid chamber or the second liquid chamber from the pores.
As described above, the generation of air bubbles can be suppressed, and even if air bubbles are generated, they can be easily maintained in a finely dispersed state. Also, the noise generated can be suppressed.

Moreover, the protrusion may be formed along the entire periphery of the periphery of the opening of the pore on the surface of the barrier.
In this case, since the projections are formed along the entire periphery of the aperture openings of the pores on the surface of the barrier, the liquid In addition, it is possible to suppress the flow rate of the liquid flowing into the first liquid chamber or the second liquid chamber from the pores.

In addition, the top of the protrusion has an acute angle or a curved shape in which the thickness in the hole diameter direction perpendicular to the hole axis direction in the plan view gradually decreases toward the outside of the hole along the hole axis direction. may be formed in
In this case, since the top of the protrusion is formed to have a sharp angle or a curved surface, the top face facing the first liquid chamber or the second liquid chamber is not formed on the top of the protrusion, so that the fine pores are not formed. It is possible to suppress the occurrence of eddy currents between the liquid that has passed through and the top of the projection, thereby effectively suppressing the generation of air bubbles.

ADVANTAGE OF THE INVENTION According to this invention, generation|occurrence|production of the abnormal noise resulting from cavitation collapse can be suppressed by a simple structure, without deteriorating a vibration-proof characteristic.

1 is a vertical cross-sectional view of a vibration isolator according to a first embodiment of the present invention; FIG. FIG. 2 is a plan view of a partition member of the vibration isolator shown in FIG. 1; FIG. 2 is a partially enlarged perspective view of the first barrier shown in FIG. 1; 2 is a longitudinal sectional view of the pore shown in FIG. 1; FIG. FIG. 8 is a partially enlarged plan view of a partition member according to a second embodiment of the present invention;

(First embodiment)
BEST MODE FOR CARRYING OUT THE INVENTION An embodiment of a vibration isolator according to the present invention will be described below with reference to the drawings.
As shown in FIG. 1, the vibration isolator 10 includes a tubular first mounting member 11 connected to one of the vibration generating portion and the vibration receiving portion, and a tubular mounting member 11 connected to the other of the vibration generating portion and the vibration receiving portion. A second mounting member 12 to be connected, an elastic body 13 for elastically connecting the first mounting member 11 and the second mounting member 12 to each other, and a main liquid chamber (first liquid chamber) described later inside the first mounting member 11 . ) 14 and a partition member 16 for partitioning into a sub-liquid chamber (second liquid chamber) 15 .

Hereinafter, the direction along the central axis O1 of the first mounting member 11 is referred to as the axial direction (hole axis direction). In addition, the side of the second mounting member 12 along the axial direction is called the upper side, and the side of the partition member 16 is called the lower side. Further, in a planar view of the vibration isolator 10 viewed from the axial direction, the direction perpendicular to the center axis O1 is called the radial direction, and the direction rotating around the center axis O1 is called the circumferential direction.
In addition, the first mounting member 11, the second mounting member 12, and the elastic body 13 are each formed in a circular shape or an annular shape in plan view, and are arranged coaxially with the central axis O1.

When this anti-vibration device 10 is installed in an automobile, for example, the second mounting member 12 is connected to the engine as a vibration generator, and the first mounting member 11 is connected to the vehicle body as a vibration receiving portion. This suppresses transmission of engine vibrations to the vehicle body.

The second mounting member 12 is a columnar member extending in the axial direction, and is formed in a hemispherical shape with a downwardly bulging lower end portion, and a collar portion 12a extending upward from the hemispherical lower end portion. have. The second mounting member 12 has a threaded hole 12b extending downward from the upper end surface thereof, and a bolt (not shown) serving as an engine-side mounting tool is screwed into the threaded hole 12b. The second mounting member 12 is arranged at the upper end opening of the first mounting member 11 via the elastic body 13 .

The elastic body 13 is a rubber body that is vulcanized and bonded to the upper end opening of the first mounting member 11 and the lower outer peripheral surface of the second mounting member 12 and interposed therebetween. The upper end opening of the mounting member 11 is closed from above. The upper end portion of the elastic body 13 abuts against the flange portion 12a of the second mounting member 12, so that the elastic body 13 is sufficiently adhered to the second mounting member 12 and follows the displacement of the second mounting member 12 well. ing. A rubber film 17 is formed integrally with the lower end portion of the elastic body 13 to liquid-tightly cover the inner peripheral surface of the first mounting member 11 and the inner peripheral portion of the lower end opening edge. As the elastic body 13, it is also possible to use an elastic body made of synthetic resin or the like instead of rubber.

The first mounting member 11 is formed in a cylindrical shape having a flange 18 at its lower end, and is connected to a vehicle body or the like as a vibration receiving portion via the flange 18 . A portion of the interior of the first mounting member 11 located below the elastic body 13 serves as a liquid chamber 19 . In this embodiment, a partition member 16 is provided at the lower end of the first mounting member 11 and a diaphragm 20 is provided below the partition member 16 . The upper surface of the outer peripheral portion 22 of the partition member 16 is in contact with the lower end opening edge of the first mounting member 11 .

The diaphragm 20 is made of an elastic material such as rubber or soft resin, and is formed in a cylindrical shape with a bottom. The upper end portion of the diaphragm 20 is axially sandwiched between the lower surface of the outer peripheral portion 22 of the partition member 16 and the ring-shaped holder 21 positioned below the partition member 16 . The lower end of the rubber film 17 is in liquid-tight contact with the upper surface of the outer peripheral portion 22 of the partition member 16 .

With such a configuration, the outer peripheral portion 22 of the partition member 16 and the holder 21 are arranged downward in this order on the edge of the lower end opening of the first mounting member 11, and are integrally fixed by screws 23. As a result, the diaphragm 20 is attached to the lower end opening of the first attachment member 11 via the partition member 16 . In the illustrated example, the bottom portion of the diaphragm 20 is deep at the outer peripheral side and shallow at the central portion. However, as the shape of the diaphragm 20, various conventionally known shapes can be adopted besides such a shape.

By attaching the diaphragm 20 to the first attachment member 11 via the partition member 16 in this way, the liquid chamber 19 is formed in the first attachment member 11 as described above. The liquid chamber 19 is arranged inside the first mounting member 11 , that is, inside the first mounting member 11 in plan view, and forms a closed space that is liquid-tightly sealed by the elastic body 13 and the diaphragm 20 . . The liquid L is enclosed (filled) in the liquid chamber 19 .

The liquid chamber 19 is partitioned into a main liquid chamber 14 and a sub liquid chamber 15 by a partition member 16 . The main liquid chamber 14 is formed by using the lower surface 13a of the elastic body 13 as a part of its wall surface. is a space surrounded by , and the internal volume changes according to the deformation of the elastic body 13 . The sub-liquid chamber 15 is a space surrounded by the diaphragm 20 and the partition member 16 , and its internal volume changes as the diaphragm 20 deforms. The anti-vibration device 10 having such a configuration is a compression type device that is attached so that the main liquid chamber 14 is positioned on the upper side in the vertical direction and the auxiliary liquid chamber 15 is positioned on the lower side in the vertical direction. .

A first holding groove 16a recessed upward is formed in a portion of the lower surface of the partition member 16 facing the auxiliary liquid chamber 15 side, which is adjacent to the outer peripheral portion 22 on the inner side in the radial direction. A space between the diaphragm 20 and the partition member 16 is closed by the upper end portion of the diaphragm 20 being in close contact with the first holding groove 16a.
A downwardly recessed second holding groove 16b is formed in a portion of the upper surface of the partition member 16 facing the main liquid chamber 14 side that is adjacent to the outer peripheral portion 22 on the inner side in the radial direction. The gap between the rubber film 17 and the partition member 16 is blocked by the lower end portion of the rubber film 17 being in close contact with the second holding groove 16b.

A restriction passage 24 is formed in the partition member 16 to communicate the main liquid chamber 14 and the sub-liquid chamber 15 . As shown in FIGS. 1 and 2, the restriction passage 24 includes a first communicating portion 26 opening to the main fluid chamber 14, a second communicating portion 27 opening to the sub-liquid chamber 15, and a first communicating portion 26 and a second communicating portion 26. A body flow path 25 communicating with the communicating portion 27 is provided.

The main flow path 25 extends along the circumferential direction within the partition member 16, and the flow path direction of the main flow path 25 and the circumferential direction are the same. The main flow passage 25 is formed in an arcuate shape coaxial with the central axis O1 and extends over a range with a central angle exceeding 180° around the central axis O1. The main flow path 25 is defined by a first barrier 28 facing the main liquid chamber 14 and a second barrier 29 facing the sub-liquid chamber 15 of the partition member 16 .

Both the first barrier 28 and the second barrier 29 are formed in a plate shape with front and back surfaces facing the axial direction. The first barrier 28 is sandwiched between the main flow path 25 and the main liquid chamber 14 in the axial direction and positioned between the main flow path 25 and the main liquid chamber 14 . The second barrier 29 is axially sandwiched between the main flow path 25 and the sub-liquid chamber 15 and positioned between the main flow path 25 and the sub-liquid chamber 15 .
The second communication portion 27 has one opening 32 that axially penetrates the second barrier 29 . The opening 32 is arranged in a portion of the second barrier 29 that forms one end along the circumferential direction of the main flow path 25 .

In the present embodiment, the first communication portion 26 has a plurality of pores 31 axially penetrating the first barrier 28 and arranged along the circumferential direction. The plurality of pores 31 are arranged in a portion of the first barrier 28 that forms the other end along the circumferential direction of the main flow channel 25 . At least some of the plurality of pores 31 form a row of holes arranged at intervals in the circumferential direction on concentric circles centered on the central axis O1.
Hereinafter, along the circumferential direction, the one end side of the main flow passage 25 will be referred to as one side, and the other end side will be referred to as the other side. Further, in the plan view, the direction perpendicular to the center axis O2 (see FIG. 3) of the pore 31 is called the hole diameter direction, and the direction around the center axis O2 is called the hole circumferential direction. The central axis O2 extends along the axial direction.

Each of the plurality of pores 31 is smaller than the flow channel cross-sectional area of the main flow channel 25 and is arranged inside each of the first barrier 28 and the main flow channel 25 in plan view. In the illustrated example, the lengths of the plurality of pores 31 are equal to each other. The inner diameters of the plurality of pores 31 are equal to each other. Note that the lengths and inner diameters of the plurality of pores 31 may be different from each other.
A plurality of pores 31 are formed in the first barrier 28 at intervals in the radial direction. That is, a plurality of rows of holes are arranged in the first barrier 28 at intervals in the radial direction. In the illustrated example, two pores 31 are formed in the first barrier 28 with an interval in the radial direction. The pores 31 adjacent to each other in the radial direction are arranged such that their positions in the circumferential direction are shifted from each other. It should be noted that the plurality of pores 31 may be arranged in the first barrier 28 at equal positions along the circumferential direction at intervals in the radial direction.

The cross-sectional area of the pores 31 may be, for example, 25 mm ² or less, preferably 2 mm ² or more and 8 mm ² or less.
The cross-sectional area of the entire first communicating portion 26 obtained by summing the cross-sectional area of each of the plurality of pores 31 is the minimum value of the cross-sectional area of the main flow channel 25, for example, 1 0.8 times or more and 4.0 times or less.

In the present embodiment, as shown in FIGS. 2 and 3 , of the first barrier 28 , a surface 28 a facing the main liquid chamber 14 has a peripheral portion of the opening of the pore 31 that protrudes toward the main liquid chamber 14 . A protruding portion 40 is formed over the entire circumference. In the illustrated example, the protrusion 40 is formed continuously over the entire circumference. The protruding portions 40 are formed on the periphery of openings of all the pores 31 on the surface 28 a of the first barrier 28 . The protrusion 40 may be formed on the surface 29 a of the second barrier 29 facing the sub-liquid chamber 15 .
The size of the protrusion 40 in the axial direction is smaller than the inner diameter of the hole 31 . As a result, it is possible to suppress an increase in the overall axial size of the pores 31 and the protrusions 40 and to suppress an increase in the flow velocity of the liquid flowing into the main liquid chamber 14 from the pores 31 . The size of the protrusion 40 in the axial direction is equivalent to the size in the hole diameter direction between the inner peripheral surface and the outer peripheral surface of the protrusion 40 . The plurality of protrusions 40 have the same shape and size. Note that the plurality of projections 40 may be formed in different shapes and different sizes.

Moreover, the protrusion 40 is the most distant from at least the other of the first communicating portion 26 and the second communicating portion 27 along the direction of the flow path among the plurality of pores 31 on the surface 28a of the first barrier 28. It is formed at the opening peripheral edge of the pore 31 located at the same position. In the illustrated example, of the plurality of pores 31 on the surface 28a of the first barrier 28, at least the opening peripheral edge of the pore 31 located farthest from the second communicating portion 27 along the direction of the flow path is formed. It is

As a result, the protrusion 40 is formed at the peripheral edge of the opening of the surface 28a of the pore 31 where the flow rate increases due to the inertia of the liquid L flowing through the main flow channel 25, thereby forming the second communication along the flow channel direction. Compared to the configuration in which the pores 31 located closest to the portion 27 are formed only in the peripheral edge portion of the opening of the surface 28a, the function and effect of the projecting portion 40, which will be described later, can be remarkably achieved. The protrusion 40 is at least the peripheral edge of the opening of the pore 31 located closest to the second communicating portion 27 along the flow path direction, among the plurality of pores 31 on the surface 28a of the first barrier 28. may be formed in

Further, in the present embodiment, the inner peripheral surface of the protrusion 40 has a similar shape to the inner peripheral surface of the pore 31 in plan view as seen from the axial direction of the pore 31 . In the illustrated example, as shown in FIG. 4, the inner peripheral surface of the protrusion 40 is continuous with the inner peripheral surface of the hole 31 in the hole diameter direction without a step. In addition, the inner peripheral surface of the protrusion 40 and the inner peripheral surface of the pore 31 may be separated from each other in the pore diameter direction.

As shown in FIG. 4, the apex 40a of the protrusion 40 is formed in an acute-angled or curved shape such that the thickness in the direction of the diameter of the hole gradually decreases in plan view as it goes upward. In the illustrated example, the top portion 40a is formed in a curved surface shape that protrudes upward, and is located in the central portion in the hole diameter direction between the inner peripheral surface and the outer peripheral surface of the projection portion 40. As shown in FIG.

In the vibration isolator 10 having such a configuration, both mounting members 11 and 12 are relatively displaced while elastically deforming the elastic body 13 when vibration is input. Then, the liquid pressure in the main liquid chamber 14 fluctuates, the liquid L in the main liquid chamber 14 flows into the sub-liquid chamber 15 through the restricted passage 24, and the liquid L in the sub-liquid chamber 15 flows into the restricted passage 24. flows into the main liquid chamber 14 through .

According to the vibration isolator 10 according to the present embodiment, when the liquid L flows from the main flow channel 25 into the main liquid chamber 14 through the plurality of pores 31, the liquid L flows into the first liquid chamber 14 in which these pores 31 are formed. Since the liquid flows through each of the pores 31 while being pressure-lossed by the barrier 28, the flow velocity of the liquid L flowing into the main liquid chamber 14 can be suppressed.

Moreover, since the liquid L flows through a plurality of pores 31 instead of a single pore 31, the liquid L can be branched and circulated, and the liquid L that has passed through each of the pores 31 can be distributed. can reduce the flow velocity of As a result, even if a large load (vibration) is input to the vibration isolator 10, the liquid L flowing into the main liquid chamber 14 through the pores 31 and the liquid L in the main liquid chamber 14 It is possible to suppress the difference in flow speed between them, thereby suppressing the generation of vortices caused by the difference in flow speeds and the generation of bubbles caused by the vortices.
Further, even if air bubbles are generated in the main flow channel 25 instead of the main liquid chamber 14, the generated air bubbles are separated from each other in the main liquid chamber 14 by allowing the liquid L to pass through the plurality of pores 31. As a result, it is possible to suppress the confluence and growth of the bubbles, thereby making it easier to maintain the finely dispersed state of the bubbles.

In addition, the inner peripheral surface of the peripheral edge of the opening of the pore 31 on the surface 28a of the first barrier 28 has a similar shape to the inner peripheral surface of the pore 31 in plan view and protrudes toward the main liquid chamber 14. A protrusion 40 is formed over the entire circumference. Therefore, the liquid L can be made to flow into the main liquid chamber 14 through the pores 31 while flowing along the inner peripheral surface of the protrusion 40 . The flow separation of the liquid L can be suppressed, and the velocity of the liquid L flowing into the main liquid chamber 14 through the pores 31 can be suppressed.
As described above, the generation of air bubbles can be suppressed, and even if air bubbles are generated, they can be easily maintained in a finely dispersed state. Also, the noise generated can be suppressed.

In addition, since the protrusion 40 is formed along the entire periphery of the opening peripheral portion of the pore 31 on the surface 28a of the first barrier 28, the peripheral portion of the opening of the pore 31 can be As a result, separation of the liquid flow can be suppressed over a long period of time, and the velocity of the liquid flowing into the main liquid chamber 14 or the sub-liquid chamber 15 from the pores 31 can be suppressed.

In addition, since the top portion 40a of the projection portion 40 is formed in a curved shape, the top surface facing the main liquid chamber 14 is not formed on the top portion 40a. It is possible to suppress the occurrence of a vortex flow with the top of the portion 40, thereby effectively suppressing the generation of air bubbles.

(Second embodiment)
Next, a vibration isolator according to a second embodiment of the invention will be described. The same reference numerals are assigned to the same configurations as in the first embodiment, and the description thereof will be omitted, and only the points of difference will be described. Further, the description of the same action will be omitted.

As shown in FIG. 5, in the vibration isolator according to the present embodiment, the projection 40B is formed on the surface 28a of the first barrier 28 that faces the main liquid chamber 14, and is formed along the periphery of the opening of the pore 31. formed intermittently throughout the That is, a plurality of intermittent portions 41 are formed in the projection portion 40B at intervals in the hole circumferential direction. In the illustrated example, five intermittent portions are formed in the projection 40B at equal intervals in the hole circumferential direction. The total circumferential length of the plurality of intermittent portions 41 is desirably 20% or less of the circumferential length of the opening peripheral portion of the pore 31 .

The plurality of intermittent portions 41 are formed in the opening peripheral edge portion of the pore 31 on the surface 28a, avoiding each position sandwiching the central axis O2 in the hole diameter direction. That is, the intermittent portion 41 faces the inner peripheral surface of the protruding portion 40B in the hole diameter direction.
Since the intermittent portion 41 is opposed to the inner peripheral surface of the projection portion 40B in the hole diameter direction in this way, when the liquid flows from the main flow channel 25 into the main liquid chamber 14 through the pores 31, a plurality of intermittent portions Even if bubbles are generated in the portion 41, when these bubbles flow through the main liquid chamber 14, they are prevented from merging with the flow of the liquid flowing into the main liquid chamber 14 from the pores 31. can do.

The technical scope of the present invention is not limited to the above embodiments, and various modifications can be made without departing from the gist of the present invention.
For example, in the above-described embodiment, the top portions 40a of the protrusions 40 and 40B are formed to have an acute angle or a curved surface, but the present invention is not limited to such an aspect. The top portion 40a may be formed on a flat surface.

Further, although the pores 31 are formed in the first barrier 28 in the above embodiment, they may be formed in the second barrier 29 or may be formed in both the first barrier 28 and the second barrier 29. .
Further, although the pores 31 are formed in a columnar shape (straight circular hole shape) in the above-described embodiment, they may be formed in a truncated cone shape whose diameter gradually decreases.

Moreover, in the above-described embodiment, the plurality of pores 31 are formed in a circular cross-sectional view, but the present invention is not limited to this. For example, the plurality of pores 31 may be changed as appropriate, such as forming the cross-sectional viewing angle shape.
In addition, in the above-described embodiment, the first communication portion 26 has a plurality of pores 31, but for example, a configuration having both an opening having a diameter larger than that of the pores 31 and the pores 31 may be adopted. . Further, the second communicating portion 27 may include a plurality of openings 32 arranged along the circumferential direction (the flow channel direction of the main flow channel 25).

In the above-described embodiment, the partition member 16 is arranged at the lower end portion of the first mounting member 11, and the outer peripheral portion 22 of the partition member 16 is brought into contact with the lower end opening edge of the first mounting member 11. However, for example, a partition is provided. By arranging the member 16 sufficiently above the lower end opening edge of the first mounting member 11 and disposing the diaphragm 20 below the partition member 16, that is, on the lower end of the first mounting member 11, the first mounting member A sub-liquid chamber 15 may be formed from the lower end of the diaphragm 11 to the bottom surface of the diaphragm 20 .

Further, in the above-described embodiment, the compression-type vibration isolator 10 in which a positive pressure acts on the main fluid chamber 14 due to the application of a supporting load has been described. It can also be applied to a suspension type anti-vibration device in which the sub-liquid chamber 15 is mounted vertically upward and negative pressure acts on the main liquid chamber 14 when a supporting load acts.
In the above-described embodiment, the partition member 16 partitions the liquid chamber 19 in the first mounting member 11 into the main liquid chamber 14 having the elastic body 13 on a part of the wall surface and the sub liquid chamber 15. , but not limited to these. For example, instead of providing the diaphragm 20, the elastic body 13 may be provided, and instead of providing the sub-liquid chamber 15, a pressure-receiving liquid chamber having the elastic body 13 on a part of the wall surface may be provided. For example, the partition member 16 partitions the liquid chamber 19 in the first mounting member 11 in which the liquid L is sealed into the main liquid chamber 14 and the sub-liquid chamber 15, and at least one of the main liquid chamber 14 and the sub-liquid chamber 15 One can be appropriately changed to another configuration in which the elastic body 13 is part of the wall surface.
Moreover, the anti-vibration device 10 according to the present invention is not limited to the engine mount of a vehicle, and can be applied to other than the engine mount. For example, it can also be applied to mounts of generators mounted on construction machines, or can be applied to mounts of machines installed in factories and the like.

In addition, it is possible to appropriately replace the components in the above-described embodiment with known components without departing from the scope of the present invention, and the above-described embodiments and modifications may be combined as appropriate.

REFERENCE SIGNS LIST 10 anti-vibration device 11 first mounting member 12 second mounting member 13 elastic body 14 main liquid chamber (first liquid chamber)
15 secondary liquid chamber (second liquid chamber)
16 partition member 19 liquid chamber 24 restriction passage 25 main flow path 26 first communicating portion 27 second communicating portion 28 first barrier 28a surface 29 second barrier 31 pore 40, 40B projection 40a top

Claims (3)

a cylindrical first mounting member connected to one of the vibration generating portion and the vibration receiving portion, and a second cylindrical mounting member connected to the other;
an elastic body that elastically connects both of these mounting members;
a partition member for partitioning the liquid chamber in the first mounting member in which the liquid is enclosed into a first liquid chamber and a second liquid chamber;
A liquid-filled type vibration isolator in which a restricted passage communicating between the first liquid chamber and the second liquid chamber is formed in the partition member,
The restriction passage includes a first communication portion opening to the first liquid chamber, a second communication portion opening to the second liquid chamber, and a main flow passage communicating the first communication portion and the second communication portion. with
At least one of the first communication portion and the second communication portion has a surface facing the first liquid chamber or the second liquid chamber and passes through a barrier defining the main flow path. Equipped with multiple pores that
A protrusion projecting toward the first liquid chamber or the second liquid chamber is formed on the periphery of the opening of the pore on the surface of the barrier,
A vibration isolator according to claim 1, wherein an inner peripheral surface of the protrusion has a shape similar to that of the inner peripheral surface of the pore when viewed from above along the central axis of the pore. 2. A vibration isolator according to claim 1, wherein said protrusions are formed along the entire periphery of the periphery of openings of said pores on the surface of said barrier. The apex of the protrusion is formed in an acute angle or a curved shape in which the thickness in the pore diameter direction orthogonal to the pore axis direction in plan view gradually decreases toward the outside of the pore along the pore axis direction. 3. The vibration isolator according to claim 1, wherein the vibration isolator is formed as follows.

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