JP2019098953A - Vibration isolating device - Google Patents

Abstract

To suppress generation of noise due to cavitation disruption without deteriorating vibration isolation property by a simple structure.SOLUTION: A restriction passage 24 includes: a first communication part 26 opened in a first liquid chamber 14; a second communication part opened in a second liquid chamber 15; and a body flow passage 25 for communicating between the first communication part and the second communication part. At least one of the first communication part and the second communication part includes a plurality of pores 26a. A barrier 40 formed with the pores is made of a rubber material.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a vibration control device which is applied to, for example, an automobile, an industrial machine, etc., and absorbs and attenuates vibration of a vibration generating unit such as an engine.

  As this type of vibration damping device, conventionally, a cylindrical first mounting member connected to one of the vibration generating portion and the vibration receiving portion, a second mounting member connected to the other, and both of these mountings A configuration is known that includes an elastic body connecting the members, and a partition member that divides the liquid chamber in the first mounting member in which the liquid is sealed into a main liquid chamber and a sub liquid chamber. In the partition member, a restricted passage communicating the main fluid chamber and the sub fluid chamber is formed. In this vibration damping device, at the time of vibration input, both mounting members are relatively displaced while elastically deforming the elastic body, and the fluid pressure of the main fluid chamber is changed to circulate the fluid in the restricted passage to absorb the vibration. And is attenuated.

By the way, in this vibration damping device, for example, a large load (vibration) is input from the unevenness of the road surface, etc., and the hydraulic pressure in the main fluid chamber rises sharply, and then the load is input in the reverse direction due to rebound of the elastic body. At times, the main fluid chamber may be suddenly underpressured. Then, this sudden negative pressure generation may cause cavitation in which many bubbles are generated in the liquid, and further, abnormal noise may occur due to cavitation collapse in which the generated bubbles collapse.
Therefore, for example, as in the case of the vibration control device shown in Patent Document 1 below, providing a valve body in the restricted passage makes negative pressure in the main liquid chamber even when vibration with a large amplitude is input. Configurations to suppress are known.

JP, 2012-172832, A

  However, in the above-described conventional vibration damping device, the provision of the valve body complicates the structure, and the tuning of the valve body is also required, so there is a problem that the manufacturing cost increases. Further, by providing the valve body, the degree of freedom in design may be reduced, and as a result, the vibration isolation characteristics may be reduced.

  The present invention has been made in view of the above circumstances, and it is an object of the present invention to provide a vibration control device capable of suppressing the generation of abnormal noise due to cavitation collapse without reducing the vibration control characteristic with a simple structure. Do.

In order to solve the above-mentioned subject, the present invention proposes the following means.
The vibration damping device according to the present invention comprises a cylindrical first mounting member connected to one of the vibration generating portion and the vibration receiving portion, a second mounting member connected to the other, and both mounting members. And a partition member for partitioning the liquid chamber in the first mounting member in which the liquid is sealed into a first liquid chamber and a second liquid chamber, and the partition member A liquid filled type vibration damping device in which a restricted passage communicating the first liquid chamber and the second liquid chamber is formed, wherein the restricted passage is a first communication portion opened to the first liquid chamber. A second communication portion opened to the second liquid chamber; and a main body flow path communicating the first communication portion and the second communication portion, and one of the first communication portion and the second communication portion At least one includes a plurality of pores, and the barrier in which the plurality of pores are formed is formed of a rubber material It has been.

According to the present invention, at the time of vibration input, both mounting members are relatively displaced while elastically deforming the elastic body, and the fluid pressure of at least one of the first fluid chamber and the second fluid chamber fluctuates. Then, the liquid tries to flow between the first liquid chamber and the second liquid chamber through the restriction passage. At this time, the liquid flows into the restriction passage through one of the first communication portion and the second communication portion, passes through the main body flow path, and then passes through the other of the first communication portion and the second communication portion. Flow out of
Here, when the liquid flows from the restriction passage into the first liquid chamber or the second liquid chamber through the plurality of pores, the liquid flows through the respective pores while being pressure-dropped by the barrier in which the pores are formed. Therefore, the flow rate of the liquid flowing into the first liquid chamber or the second liquid chamber can be suppressed. Moreover, since the liquid flows through a plurality of pores instead of a single pore, it is possible to branch the liquid into a plurality of channels and reduce the flow velocity of the liquid passing through the individual pores. Can. Thereby, even if a large load (vibration) is input to the vibration isolation device, the liquid that has flowed into the first liquid chamber or the second liquid chamber after passing through the pores, and the first liquid chamber or the second liquid chamber It is possible to reduce the difference in flow velocity generated between the liquid and the liquid, and to suppress the generation of a vortex due to the flow velocity difference and the generation of a bubble due to the vortex. In addition, even if bubbles are generated in the restricted passage instead of the first liquid chamber or the second liquid chamber, the generated bubbles can be made to pass through the plurality of pores through the first liquid chamber or the second liquid chamber. It becomes possible to separate in the liquid chamber, and it is possible to suppress the merging and growth of the bubbles and to easily maintain the bubbles in a finely dispersed state.
As described above, it is possible to suppress the generation of air bubbles itself, and even if the air bubbles are generated, it is possible to easily maintain the air bubbles in a finely dispersed state, so cavitation collapse where air bubbles collapse occurs. Also, the noise generated can be reduced.

Further, since the barrier of the vibration damping device according to the present invention is formed of a rubber material, when the liquid flows into any one of the first liquid chamber and the second liquid chamber through the plurality of pores formed in the barrier When the fluid pressure in the main flow passage becomes higher than the fluid pressure in the one fluid chamber, the barrier elastically deforms and bulges toward the one fluid chamber. At this time, the inner diameter on the one liquid chamber side in the pore becomes larger than the inner diameter on the main body channel side, and the liquid flows from the smaller diameter side to the larger diameter side, so the flow resistance of the pore Can be further increased, and the liquid flowing through the pores can be more pressure lost to further reduce its flow rate.
In addition, when the liquid flows into any one of the first liquid chamber and the second liquid chamber, the barrier elastically deforms and bulges toward the one liquid chamber, so a plurality of thin lines formed on the barrier The liquid can be further dispersed into the one liquid chamber through the holes and can be made to flow. Even if air bubbles are generated in the restricted passage, the air bubbles can be more easily maintained in a dispersed state.

  In addition, when the barrier (or a member including the barrier) is formed by casting or injection molding, it is difficult to form pores in the barrier, or for forming the pore when releasing the molded barrier from the mold. Although the molding pin of the mold may be worn away, the barrier of the present invention is formed of a rubber material, so that the pore can be easily formed in the barrier and the barrier is elastically deformed to be gold. It can be easily released from the mold and the friction against the molding pin of the mold can be suppressed to reduce its wear. Therefore, the production efficiency of the vibration control device can be improved, and the production cost can be reduced.

  A storage chamber in which a membrane is stored may be formed in the partition member, and the barrier may be integrally formed with the membrane.

  In this case, a storage chamber in which the membrane is stored is formed in the partition member, and the barrier is integrally formed with the membrane, so the number of parts of the vibration damping device can be reduced and the manufacturing cost can be reduced. .

  The partition member may include a base member fitted in the first attachment member, and the base member may be formed of a rigid material.

  In this case, since the partition member includes the base member fitted in the first mounting member, and the base member is formed of a rigid material, the fluid pressure of the first fluid chamber and the second fluid chamber is Even in the case of fluctuation, the base member can appropriately partition the liquid chamber in the first mounting member into the first liquid chamber and the second liquid chamber.

  According to the present invention, it is possible to suppress the generation of noise due to cavitation collapse without reducing the vibration isolation characteristics with a simple structure.

It is a longitudinal cross-sectional view of the vibration isolator which concerns on one Embodiment of this invention. It is a top view of the partition member which comprises the anti-vibration apparatus shown in FIG. It is explanatory drawing which shows operation | movement of the vibration isolator which concerns on one Embodiment of this invention, Comprising: (a) is a figure which shows the state of the barrier at the time of a liquid flowing toward a main liquid chamber from a whirlpool, (b) These are figures which show the state of the barrier in case a liquid distribute | circulates toward a vortex chamber from a main liquid chamber.

Hereinafter, an embodiment of a vibration damping device according to the present invention will be described based on FIG. 1 and FIG.
As shown in FIG. 1, the vibration damping device 10 includes a cylindrical first mounting member 11 coupled to one of the vibration generating unit and the vibration receiving unit, and the other of the vibration generating unit and the vibration receiving unit. The second mounting member 12 to be connected, the elastic body 13 which elastically connects the first mounting member 11 and the second mounting member 12 to each other, and the main liquid chamber (described later) (the liquid chamber 19 in the first mounting member 11) It is a liquid-sealed anti-vibration device including a partition member 16 that divides a first liquid chamber) 14 and a secondary liquid chamber (second liquid chamber) 15.

Hereinafter, a direction along the central axis O of the first mounting member 11 is referred to as an axial direction. Further, the second attachment member 12 side along the axial direction is referred to as the upper side, and the partition member 16 side is referred to as the lower side. Further, in a plan view of the vibration control device 10 as viewed from the axial direction, a direction orthogonal to the central axis O is referred to as a radial direction, and a direction circling around the central axis O is referred to as a circumferential direction.
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 O.

  For example, when the anti-vibration device 10 is mounted on an automobile, the second mounting member 12 is connected to an engine as a vibration generating unit, and the first mounting member 11 is connected to a vehicle body as a vibration receiving unit. Thereby, transmission of engine vibration to the vehicle body is suppressed.

  The second mounting member 12 is a columnar member extending in the axial direction, and the lower end portion is formed in a hemispherical shape which bulges downward, and the flange portion 12a is formed above the hemispherical lower end portion. have. The second mounting member 12 is provided with a screw hole 12b extending downward from the upper end surface thereof, and a bolt (not shown) serving as an attachment on the engine side is screwed into the screw hole 12b. The second mounting member 12 is disposed at the upper end opening of the first mounting member 11 via the elastic body 13.

  The elastic body 13 is a rubber body which is vulcanized and adhered to the upper end opening portion of the first mounting member 11 and the outer peripheral surface of the lower portion of the second mounting member 12, respectively, and is interposed between The upper end opening of the mounting member 11 is closed from the upper side. The elastic body 13 comes in close contact with the second mounting member 12 when the upper end thereof abuts on the flange 12a of the second mounting member 12, and follows the displacement of the second mounting member 12 favorably. ing. At the lower end portion of the elastic body 13, a rubber film 17 which covers the inner peripheral surface of the first attachment member 11 and the inner peripheral portion of the lower end opening edge in a liquid tight manner is integrally formed. In addition to rubber, it is also possible to use an elastic body made of a synthetic resin or the like as the elastic body 13.

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. In the present embodiment, a partition member 16 is provided at the lower end portion of the first mounting member 11, and a diaphragm 20 is provided below the partition member 16.
The partition member 16 is formed in a plate shape whose front and back surfaces face in the axial direction, and the upper surface of the outer peripheral portion 22 connected to the radially outer side 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 made of the outer peripheral portion 22 in a state where a part of the upper end portion of the diaphragm 20 is in fluid tight engagement with the annular mounting groove 16 a formed on the lower surface of the outer peripheral portion 22 of the partition member 16. It is pinched in the axial direction by the lower surface and the ring-shaped holder 21 located below the partition member 16. The lower end portion of the rubber film 17 is formed on the upper surface of the outer peripheral portion 22 of the partition member 16 in a state where a part of the lower end portion of the rubber film 17 is engaged with the annular holding groove 16 b formed on the upper surface of the outer peripheral portion 22. It is in fluid tight contact.

  Under such a configuration, the outer peripheral portion 22 of the partition member 16 and the holder 21 are disposed downward in this order at the lower end opening edge of the first mounting member 11, and are integrally fixed by the screw 23. Thus, 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 of the diaphragm 20 is deep at the outer peripheral side and shallow at the center. However, as a shape of the diaphragm 20, various shapes conventionally known can be adopted other than such a shape.

  Then, the diaphragm 20 is attached to the first attachment member 11 via the partition member 16 as described above, whereby the liquid chamber 19 is formed in the first attachment member 11 as described above. The liquid chamber 19 is disposed inside the first mounting member 11, that is, inside the first mounting member 11 in a plan view, and is a sealed space sealed in a liquid-tight manner by the elastic body 13 and the diaphragm 20. . The liquid L is sealed (filled) in the liquid chamber 19.

  The liquid chamber 19 is divided by the partition member 16 into a main liquid chamber 14 and a sub liquid chamber 15. The main liquid chamber 14 has the lower surface 13a of the elastic body 13 on a part of the wall surface, and is surrounded by the elastic body 13 and the rubber film 17 covering the inner peripheral surface of the first mounting member 11 in a fluid tight manner The internal volume changes due to the deformation of the elastic body 13. The sub fluid chamber 15 is a space surrounded by the diaphragm 20 and the partition member 16, and the internal volume changes due to the deformation of the diaphragm 20. The vibration damping device 10 having such a configuration is a compression type device that is attached and used so that the main fluid chamber 14 is located on the upper side in the vertical direction and the secondary fluid chamber 15 is located on the lower side in the vertical direction. .

  A storage chamber 42 in which a membrane 41 made of a rubber material is stored is formed in the inside of the partition member 16. The membrane 41 is formed in a plate shape whose front and back faces face in the axial direction. The partition member 16 is formed with a plurality of first communication holes 42 a communicating the storage chamber 42 and the main liquid chamber 14, and a plurality of second communication holes 42 b communicating the storage chamber 42 and the sub liquid chamber 15. It is done. The number of first communication holes 42 a and the number of second communication holes 42 b are the same. The inner diameters of the first communication hole 42a and the second communication hole 42b are the same. The plurality of first communication holes 42 a and the plurality of second communication holes 42 b are axially opposed to each other with the membrane 41 and the storage chamber 42 interposed therebetween.

  As shown in FIG. 1 and FIG. 2, the partition member 16 is provided with a restriction passage 24 communicating the main liquid chamber 14 and the sub liquid chamber 15. The restriction passage 24 communicates the first communication portion 26 opening to the main liquid chamber 14, the second communication portion 27 opening to the sub liquid chamber 15, the first communication portion 26 and the second communication portion 27, and And a main body channel 25 extending in the direction.

The main body flow path 25 is formed on the outer peripheral surface of the partition member 16. In the illustrated example, the main body flow path 25 is disposed in the partition member 16 in an angular range exceeding 180 ° centered on the central axis O.
The main body flow path 25 extends in the circumferential direction and has an arc-shaped first barrier 36 whose front and back faces face in the axial direction, and an arc like the front and back faces face in the axial direction. The second barrier 37 and the inner peripheral edge of each of the first barrier 36 and the second barrier 37 are connected to each other and defined by a groove bottom 38 facing radially outward. The first barrier 36 faces the sub fluid chamber 15, and the second barrier 37 faces the main fluid chamber 14.
One end of the main flow passage 25 in the circumferential direction protrudes inward in the radial direction from the other portion.
The second communication portion 27 is opened at the other end of the main body flow channel 25 in the circumferential direction, and is configured by one opening penetrating the first barrier 36 in the axial direction.

In the main body flow path 25, a vortex chamber 39 which forms a swirling flow of the liquid L in accordance with the flow velocity of the liquid L from the second communication portion 27 side is disposed in a connection portion with the first communication portion 26.
The vortex chamber 39 is formed inside the partition member 16. The vortex chamber 39 is disposed in line with the storage chamber 42 in a direction orthogonal to the axial direction, and is not in communication with the storage chamber 42 inside the partition member 16. The inner volume and the plane area of the vortex chamber 39 are smaller than the inner volume and the plane area of the accommodation chamber 42. The plan view shape of the vortex chamber 39 is circular. The vortex chamber 39 may be formed in a non-circular shape in plan view, for example, an elliptical shape or the like. Of the wall surfaces defining the swirl chamber 39, the planar area of the opposing surface 39a axially opposed to the first communication portion 26 is larger than the flow passage cross-sectional area of the main flow passage 25. The facing surface 39a of this embodiment is orthogonal to the axial direction.
The central axis of the vortex chamber 39 is disposed parallel to the central axis O and at a position different from the central axis O in a plan view. The swirling flow of the liquid L formed in the vortex chamber 39 is formed around the vortex axis along the central axis of the vortex chamber 39.

The first communicating portion 26 is positioned on the upper side of the wall portion defining the swirl chamber 39, and the front and back faces face the axial direction with the opposing face 39a and faces the main liquid chamber 14 It is formed in the vortex chamber barrier (barrier) 40. The first communicating portion 26 is provided with a plurality of pores 26 a circular in plan view, which penetrate the vortex chamber barrier 40 in the axial direction. The vortex chamber barrier 40 extends in a direction perpendicular to the vortex axis, and the lower surface of the vortex chamber barrier 40 is a flat surface. The vortex chamber barrier 40 may extend in a direction intersecting the vortex axis. The thickness of the vortex chamber barrier 40 in the axial direction is constant. The vortex chamber barrier 40 of the present embodiment is formed of a rubber material.
Since the plurality of pores 26 a communicate the vortex chamber 39 with the main liquid chamber 14, the vortex chamber 39 is configured to communicate the liquid L, which has flowed from the second communication portion 27 through the main flow path 25, into the plurality of pores 26 a. Can flow into the main fluid chamber 14 through the

Each of the plurality of pores 26a is smaller than the flow passage cross-sectional area of the main body flow passage 25, and is disposed inside the vortex chamber 39 in a plan view seen from the axial direction. The inner diameters of the pores 26a are equal to one another and are constant throughout the flow path length. The inner diameter of the pore 26a is smaller than the inner diameter of the first communication hole 42a and the second communication hole 42b. The sum of the opening areas of the plurality of pores 26a is smaller than the sum of the opening areas of the plurality of first communication holes 42a and the sum of the opening areas of the plurality of second communication holes 42b. The sum of the opening areas of the plurality of pores 26 a may be, for example, 1.5 times or more and 4.0 times or less the minimum value of the flow passage cross-sectional area in the main flow passage 25. The opening area of the pores 26a may be, for example, 25 mm ² or less, preferably 0.7 mm ² or more and 17 mm ² or less.

  Here, the vortex chamber barrier 40 and the membrane 41 of the present embodiment are integrally formed. The vortex chamber barrier 40 and the membrane 41 are connected to each other via a connecting portion 43 extending in an arc shape in plan view, and the vortex chamber barrier 40 is disposed above the membrane 41 so as to be shifted upward. The vortex chamber barrier 40 and the membrane 41 are generally formed in a circular shape in plan view.

The partition member 16 is configured such that the upper member (base member) 44 and the lower member (base member) 45 are stacked in the axial direction. The upper member 44 and the lower member 45 are both formed in a plate shape using a rigid material such as metal or hard resin, and are fitted in the first mounting member 11. The partition member 16 may be integrally formed as a whole. Both the upper and lower members 44 and 45 have rigidity higher than that of the vortex chamber barrier 40.
A second barrier 37 is provided at the outer peripheral edge of the upper member 44. In the upper side member 44, a first communication hole 42a and an opening 44a are respectively formed to penetrate in the axial direction. The opening 44a is disposed at the same position as the vortex chamber 39 in a plan view, and the plurality of pores 26a are disposed inside the opening 44a in a plan view. The lower surface of the upper side member 44 is provided with a support projection that abuts the entire outer periphery of the upper surface of the membrane 41 over the entire circumference.

  A first barrier 36 and a groove bottom 38 are provided at the outer peripheral edge of the lower member 45. The outer peripheral portion 22 is connected to the radially outer side of the first barrier 36. On the upper surface of the lower member 45, a first recess defining the storage chamber 42 with the lower surface of the upper member 44, and a second recess defining the vortex chamber 39 between the lower surface of the vortex chamber barrier 40 , Is formed separately. In the lower member 45, a second communication hole 42b is formed to penetrate in the axial direction so as to open at the bottom surface of the first recess. On the bottom surface of the first concave portion of the lower member 45, a support protrusion is provided which abuts on the outer peripheral edge of the lower surface of the membrane 41 over the entire circumference.

  The outer peripheral edge portion of the vortex chamber barrier 40 is sandwiched over the entire circumference between the opening peripheral edge portion of the opening 44 a in the lower surface of the upper member 44 and the opening peripheral edge of the second recess of the lower member 45 The outer peripheral edge of the lower surface of the vortex chamber barrier 40 is in fluid tight contact with the opening peripheral edge of the second recess of the lower member 45. That is, the outer peripheral edge portion of the vortex chamber barrier 40 provided with the plurality of pores 26a (the first communication portion 26) and made of a rubber material is sandwiched by the upper member 44 and the lower member 45 made of a rigid material There is.

  In the vibration damping device 10 having such a configuration, at the time of vibration input, both the mounting members 11 and 12 relatively displace while elastically deforming the elastic body 13. Then, the fluid pressure of at least one of the main fluid chamber 14 and the sub fluid chamber 15 fluctuates, and the fluid L tries to flow between the main fluid chamber 14 and the sub fluid chamber 15 through the restriction passage 24. At this time, the liquid flows into the restriction passage 24 through one of the first communication portion 26 and the second communication portion 27 and passes through the main body flow path 25, and then the liquid of the first communication portion 26 and the second communication portion 27. It flows out of the restriction passage 24 through the other.

  Here, in particular, when the liquid L flows from the second communication portion 27 side into the vortex chamber 39 provided in the connection portion with the first communication portion 26 in the main body flow channel 25, the liquid L flowing into the vortex chamber 39 is The fluid flows from the outer side in the radial direction intersecting the vortex axis to the inside while revolving about the vortex axis along the central axis of the vortex chamber 39. At this time, due to the friction between the liquid L and the inner surface of the vortex chamber 39 (that is, the inner surface of the second recess and the lower surface of the vortex chamber barrier 40), the fluid friction of the liquid L, etc. It can be reduced towards the inside.

In addition, when the liquid L flows out from the restriction passage 24 to the main liquid chamber 14 through the plurality of pores 26a, the pressure loss is caused by the vortex chamber barrier 40 in which the pores 26a are formed. Since it distribute | circulates, the flow velocity of the liquid L which flows in into the main liquid chamber 14 can be restrained. Moreover, since the liquid L flows not through a single pore but through the plurality of pores 26a, the liquid L can be branched into a plurality of branches, and the liquid L that has passed through the individual pores 26a can be distributed. The flow rate can be reduced. As a result, even if a large load (vibration) is input to the vibration isolation device 10, the liquid L that has flowed into the main liquid chamber 14 through the pores 26a and the liquid L in the main liquid chamber 14; It is possible to minimize the difference in flow velocity generated between them, and to suppress the generation of vortices due to the flow velocity difference and the generation of bubbles due to the vortices. In addition, even if bubbles are generated in the restriction passage 24 instead of the main liquid chamber 14, the generated bubbles are separated in the main liquid chamber 14 by causing the liquid L to pass through the plurality of pores 26 a. As a result, bubbles can be prevented from joining and growing, and the bubbles can be easily maintained in a finely dispersed state.
As described above, it is possible to suppress the generation of air bubbles itself, and even if the air bubbles are generated, it is possible to easily maintain the air bubbles in a finely dispersed state, so cavitation collapse where air bubbles collapse occurs. Also, the noise generated can be reduced.

Since the vortex chamber barrier 40 of the present embodiment is formed of a rubber material, the liquid L flows from the sub fluid chamber 15 toward the main fluid chamber 14 and passes mainly through the plurality of pores 26 a formed in the vortex chamber barrier 40. When the fluid pressure in the swirl chamber 39 (main flow passage 25) becomes higher than the fluid pressure in the main fluid chamber 14 when the liquid L flows into the fluid chamber 14, as shown in FIG. The spring 40 elastically deforms and bulges toward the main fluid chamber 14. At this time, the inner diameter of the pore 26a on the main liquid chamber 14 side is larger than the inner diameter of the vortex chamber 39, and the liquid L flows from the smaller diameter side to the larger diameter side of the pore 26a. The flow resistance of 26 a can be further increased, and the liquid L flowing through the pores 26 a can be pressure-loss larger to further reduce its flow rate.
In addition, when the liquid L flows from the auxiliary liquid chamber 15 into the main liquid chamber 14 through the restriction passage 24, the vortex chamber barrier 40 elastically deforms and bulges toward the main liquid chamber 14. The liquid L can be further dispersed into the main liquid chamber 14 and flowed in through the plurality of pores 26 a formed. Even if air bubbles are generated in the restriction passage 24, it is easy to maintain the air bubbles in a further dispersed state can do.
On the other hand, when the liquid L flows from the main liquid chamber 14 toward the auxiliary liquid chamber 15 and flows into the vortex chamber 39 (main flow passage 25) through the plurality of pores 26a formed in the vortex chamber barrier 40 When the fluid pressure in the main fluid chamber 14 becomes higher than the fluid pressure in the vortex chamber 39, the vortex chamber barrier 40 elastically deforms and bulges toward the vortex chamber 39, as shown in FIG. 3 (b). At this time, the inner diameter of the pore 26a on the main liquid chamber 14 side is smaller than the inner diameter of the vortex chamber 39, but the end of the pore 26a on the main liquid chamber 14 side is not completely blocked. The flow of the liquid L from the main liquid chamber 14 to the vortex chamber 39 through the pores 26a is secured.
That is, the flow of the liquid L through the pores 26a is secured in both the case where the liquid L goes from the main liquid chamber 14 to the vortex chamber 39 and the case where the liquid L goes from the vortex chamber 39 to the main liquid chamber 14 There is. In other words, the size of the pores 26a and the shape, rigidity, and the like of the vortex chamber barrier 40 are appropriately set such that the flow of the liquid L through the pores 26a is ensured in any flow direction.

  In addition, when the vortex chamber barrier (or a member including the vortex chamber barrier, for example, a member comprising the vortex chamber barrier and the membrane) is formed by casting or injection molding, it is difficult to form pores in the vortex chamber barrier. There is a possibility that the molding pin of the mold for pore formation may be worn out when the molded vortex chamber barrier is released from the mold, but the vortex chamber barrier 40 of the present invention is formed of a rubber material Therefore, it is possible to easily form pores in the vortex chamber barrier 40, and also to be easily released from the mold by elastically deforming the vortex chamber barrier 40, thereby suppressing friction on the molding pins of the mold and reducing its wear. It can be done. Therefore, the production efficiency of the vibration control device can be improved, and the production cost can be reduced.

  Since the storage chamber 42 in which the membrane 41 is housed is formed in the partition member 16 and the vortex chamber barrier 40 is integrally formed with the membrane 41, the number of parts of the vibration damping device 10 can be reduced, and the manufacturing cost is reduced. It can be reduced.

  Since the partition member 16 includes the upper member 44 and the lower member 45 fitted in the first mounting member 11, and the upper member 44 and the lower member 45 are formed of a rigid material, the main fluid Even if the fluid pressure in the chamber 14 and the sub fluid chamber 15 fluctuates, the upper member 44 and the lower member 45 can be used as the main fluid chamber 14 and the sub fluid chamber 15 in the first mounting member 11. And can be divided appropriately.

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

For example, in the embodiment, the vortex chamber barrier 40 and the membrane 41 are integrally formed, but they may be separately formed.
Although the vortex chamber 39 is provided in the partition member 16, the vortex chamber may not be provided in the partition member. In this case, at least one of the first communication portion and the second communication portion has a plurality of pores, and in the main body flow channel, at the connection portion with the one communication portion, the flow path cross-sectional area of the main flow path A diffusion chamber having a large flow passage cross-sectional area may be provided.
Although the partition member 16 has the storage chamber 42 in which the membrane 41 is stored, the storage chamber and the membrane may not be provided in the partition member.

The inner diameters of the plurality of pores 26a in the embodiment are equal to one another, but may be different. For example, the inner diameter of the pore 26a located inward in the radial direction intersecting the vortex axis may be larger than the inner diameter of the pore 26a located outward in the radial direction.
The inner diameter of the pores 26a is constant over the entire length of the flow path, but the inner diameter of the pores 26a may gradually change in the flow path length direction. Even in this case, the flow of the liquid L through the pores 26a is either the case where the liquid L goes from the main liquid chamber 14 to the vortex chamber 39 or the case where the liquid L goes from the vortex chamber 39 to the main liquid chamber 14 Are also secured.
In order to make the flow resistances of the plurality of pores different, the surface treatment of the inner surface of the plurality of pores 26a may be made different, or the inner surface of some of the pores 26a may be provided with irregularities or the like.
In the embodiment, the plurality of pores 26a are all formed in a circular shape in a plan view, but may be formed in a noncircular shape in a plan view, for example, an elliptical shape or a polygonal shape.
The plurality of pores 26a may be disposed, for example, in a multiple ring shape coaxial with the vortex axis in a plan view, or may be disposed on a plurality of straight lines extending radially in a plan view from the vortex axis.
The plurality of pores 26a are formed extending in one direction (axial direction), but the pores may be bent halfway.

  In the above embodiment, the thickness of the vortex chamber barrier 40 in the axial direction is constant, but the thickness of the vortex chamber barrier 40 may gradually change in the swirling radial direction. For example, the plate thickness of the portion of the vortex chamber barrier 40 located on the inner side in the turning radial direction may be smaller than the plate thickness of the portion located on the outer side of the turning radial direction.

The second communication portion 27 may be provided with a plurality of openings and pores that open to the auxiliary liquid chamber 15.
In the embodiment described above, the vortex chamber 39 is disposed in the connection portion with the first communication portion 26 in the main body flow channel 25, but while the vortex chamber is disposed in the connection portion with the second communication portion 27, The vortex chamber may not be disposed at the connection portion with the first communication portion 26, and the second communication portion 27 may include a plurality of pores. In this case, in the main body flow channel 25, the vortex chamber disposed at the connection portion with the second communication portion 27 forms a swirling flow of the liquid L according to the flow velocity of the liquid L flowing from the first communication portion 26; The liquid L is allowed to flow out to the auxiliary liquid chamber 15 through the plurality of pores of the second communication portion 27. Further, in the main body flow path 25, a vortex chamber may be separately disposed at each of connection portions with the first communication portion 26 and the second communication portion 27.
In the embodiment, the central axis of the vortex chamber 39 is disposed at a position different from the central axis O in plan view, but the vortex chamber 39 may be disposed coaxially with the central axis O.
In the embodiment, the central axis of the vortex chamber 39 is parallel to the central axis O, but the vortex chamber 39 may be arranged such that the central axis of the vortex chamber 39 is not parallel to the central axis O.
The partition member 16 may have any shape as long as it can separate the main liquid chamber 14 and the sub liquid chamber 15 from each other.

  In the embodiment, the partition member 16 is disposed at the lower end portion of the first mounting member 11, and 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 member 16 is disposed sufficiently above the lower end opening edge of the first attachment member 11, and the diaphragm 20 is disposed on the lower side of the partition member 16, that is, the lower end portion of the first attachment member 11. The auxiliary liquid chamber 15 may be formed from the lower surface to the bottom surface of the diaphragm 20.

Further, in the above embodiment, the compression type vibration damping device 10 in which the positive pressure acts on the main liquid chamber 14 by the application of the support load has been described. However, the main liquid chamber 14 is positioned on the lower side in the vertical direction The present invention can also be applied to a suspension type vibration damping device in which the sub fluid chamber 15 is mounted on the upper side in the vertical direction and a negative pressure acts on the main fluid chamber 14 by the application of a support load.
In the above embodiment, the partition member 16 divides the liquid chamber 19 in the first mounting member 11 into the main liquid chamber 14 having the elastic body 13 in a part of the wall and the sub liquid chamber 15. Not limited to this. For example, instead of providing the diaphragm 20, the elastic body 13 may be provided, and instead of providing the sub fluid chamber 15, a pressure receiving fluid chamber having the elastic body 13 in 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 first liquid chamber 14 and the second liquid chamber 15, and the first liquid chamber 14 and the second liquid chamber 15 It is possible to suitably change to another configuration in which at least one of the above has the elastic body 13 in part of the wall surface.
Furthermore, the vibration control device 10 according to the present invention is not limited to the engine mount of a vehicle, and may be applied to other than the engine mount. For example, the invention can be applied to a mount of a generator mounted on a construction machine, or can be applied to a mount of a machine installed in a factory or the like.

  In addition, it is possible to replace components in the embodiment with known components as appropriate without departing from the spirit of the present invention.

10 Vibration-proof 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)
DESCRIPTION OF SYMBOLS 16 Partition member 19 Liquid chamber 24 Restricted passage 25 Main body flow path 26 1st communicating part 26a Pore 27 2nd communicating part 40 Vortex chamber barrier (barrier)
41 membrane 42 storage chamber 44 upper member (base member)
45 Lower member (base member)
L liquid

Claims (3)

A cylindrical first mounting member connected to any one of the vibration generating portion and the vibration receiving portion, and a second mounting member connected to the other;
An elastic body elastically connecting the two mounting members;
And a partition member for partitioning a liquid chamber in the first mounting member in which the liquid is sealed into a first liquid chamber and a second liquid chamber.
It is a liquid-sealed anti-vibration device in which a restriction passage communicating 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 connecting the first communication portion and the second communication portion. Equipped with
At least one of the first communication portion and the second communication portion includes a plurality of pores.
The barrier having the plurality of pores formed therein is formed of a rubber material. In the partition member, a storage chamber in which a membrane is stored is formed.
The anti-vibration device according to claim 1, wherein the barrier is integrally formed with the membrane. The partition member includes a base member fitted in the first mounting member,
The said base member is formed of the material which has rigidity, The anti-vibration apparatus of Claim 1 or 2 characterized by the above-mentioned.

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