WO2019117062A1

WO2019117062A1 - Vibration-damping device

Info

Publication number: WO2019117062A1
Application number: PCT/JP2018/045246
Authority: WO
Inventors: 植木　哲; 康寿之長島; 信吾大野; 勇樹佐竹
Original assignee: 株式会社ブリヂストン
Priority date: 2017-12-11
Filing date: 2018-12-10
Publication date: 2019-06-20
Also published as: JP2019105281A; JP7027147B2; CN111433488A

Abstract

According to the present invention, a restriction passage (24) is provided with: a first communication part (26) that is open to a first liquid chamber (14); a second communication part that is open to a second liquid chamber (15); and a main body flow passage (25) communicating with the first communication part and the second communication part. In the main body flow passage, a first introduction chamber (31) and a second introduction chamber (32) are disposed in this order in a section connected to at least one communication part among the first communication part and the second communication part in a flow passage direction from the other communication part among the first communication part and the second communication part toward said one communication part. The horizontal cross-sectional area of the first introduction chamber is greater than the horizontal cross-sectional area of a section which in the main body flow passage is positioned closer to the other communication part among the first communication part and the second communication part than the first introduction chamber. The first introduction chamber and the second introduction chamber communicate via an intermediate communication passage (33) having a smaller cross-sectional area than the first introduction chamber. At least one among the first communication part and the second communication part is provided with a plurality of fine holes (26a) that pass through a barrier wall (36) facing the first liquid chamber or the second liquid chamber.

Description

Vibration control device

The present invention relates to a vibration control device that is applied to, for example, an automobile, an industrial machine, etc., and damps and absorbs the vibration of a vibration generating unit such as an engine.
Priority is claimed on Japanese Patent Application No. 2017-236594, filed Dec. 11, 2017, the content of which is incorporated herein by reference.

As this type of vibration damping device, conventionally, it is connected to the other of the cylindrical first mounting member connected to one of the vibration generating portion and the vibration receiving portion, and the other of the vibration generating portion and the vibration receiving portion A second mounting member, an elastic body connecting the two mounting members, and a partition member partitioning the liquid chamber in the first mounting member in which the liquid is sealed into a main liquid chamber and a sub liquid chamber. It has been known. The partition member is formed with a restriction passage including a first communication portion opening to the main liquid chamber, a second communication portion opening to the sub liquid chamber, and a main flow passage communicating the first communication portion and the second communication portion. It is done. 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 varied to circulate the fluid in the restricted passage, thereby damping the vibration. Is absorbed.

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. Sometimes, the main fluid chamber may be underpressured rapidly. Then, this sudden negative pressure generation generates cavitation in which a large number of bubbles are generated in the liquid, and further, abnormal noise may occur due to cavitation collapse in which the generated bubbles are collapsed.
As a means for suppressing the generation of such abnormal noise, for example, it is known that the first communication portion is provided with a plurality of pores penetrating the barrier facing the main liquid chamber as shown in Patent Document 1 below. ing.

Japanese Patent Application Laid-Open No. 2016-176509

However, in the above-described conventional vibration damping device, it is difficult to reduce air bubbles located in the main liquid chamber at the time of cavitation occurrence, and it may be difficult to suppress the generation of abnormal noise caused by cavitation collapse.

The present invention has been made in view of the above-described circumstances, and an object thereof is to provide a vibration-damping device capable of effectively suppressing the generation of abnormal noise caused by cavitation collapse.

According to a first aspect of the present invention, there is provided a vibration damping device comprising: a cylindrical first mounting member coupled to any one of a vibration generating unit and a vibration receiving unit; and a vibration generating unit and a vibration receiving unit A second mounting member connected to any one of the other, an elastic body that elastically connects the two mounting members, and a liquid chamber in the first mounting member in which the liquid is enclosed are a first liquid chamber and a second liquid A liquid-sealed anti-vibration device comprising: a partition member that divides the chamber into a chamber, wherein the partition member is formed with a restricted passage communicating the first liquid chamber and the second liquid chamber, 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. In the main body flow channel, at least one of the first communication portion and the second communication portion. The first introduction chamber and the second introduction chamber are disposed in this order in the flow path direction from the other side to the one side of the first communication portion and the second communication portion in the connection portion with the The cross-sectional area of the first introduction chamber along the direction orthogonal to the flow passage direction is the other of the first communication portion and the second communication portion in the main flow passage than the first introduction chamber. The first introduction chamber and the second introduction chamber communicate with each other through the middle communication portion of the cross-sectional area smaller than the cross-sectional area of the first introduction chamber, which is larger than the cross-sectional area of the portion located on the side At least one of the first communication portion and the second communication portion includes a plurality of pores penetrating a barrier facing the first liquid chamber or the second liquid chamber.

According to the present invention, it is possible to effectively suppress the generation of abnormal noise caused by cavitation collapse.

It is a longitudinal cross-sectional view of the vibration isolator which concerns on 1st Embodiment of this invention. FIG. 2 is a cross-sectional view of the vibration control device shown in FIG. It is a longitudinal cross-sectional view of the vibration isolator which concerns on 2nd Embodiment of this invention. FIG. 4 is a cross-sectional view of the vibration control device shown in FIG.

Hereinafter, a first 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 1 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 damping device 1 viewed from the axial direction, the direction intersecting the central axis O is referred to as the radial direction, and the direction circling around the central axis O is referred to as the 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 1 is mounted on a car, 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 first mounting member 11 may be connected to the vibration generating unit, and the second mounting member 12 may be connected to the vibration receiving unit.

The second mounting member 12 is a columnar member extending in the axial direction, and is formed in a hemispherical shape in which the lower end portion bulges downward, and has the flange portion 12a above the lower end portion in the hemispherical shape. doing. 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. At the upper end portion of the elastic body 13, a first rubber film 13a that integrally covers the lower surface, the outer peripheral surface, and the upper surface of the collar portion 12a is integrally formed. At the lower end portion of the elastic body 13, a second rubber film 13b which covers the inner peripheral surface of the first mounting member 11 in a liquid tight manner is integrally formed. In addition to rubber, it is also possible to use an elastic body formed of a synthetic resin or the like as the elastic body 13.

The first mounting member 11 is formed in a cylindrical shape, and is connected to a vehicle body or the like as a vibration receiving portion via a bracket (not shown). The lower end opening of the first mounting member 11 is closed by the diaphragm 20.
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 outer peripheral surface of the diaphragm 20 is bonded by vulcanization to the inner peripheral surface of the diaphragm ring 21. The diaphragm ring 21 is fitted in the lower end portion of the first mounting member 11 via the second rubber film 13 b. The diaphragm ring 21 is crimped and fixed in the lower end portion of the first mounting member 11. Upper end opening edges of the diaphragm 20 and the diaphragm ring 21 are in fluid-tight contact with the lower surface of the partition member 16.

And, by thus attaching the diaphragm 20 to the first attachment member 11, the inside of the first attachment member 11 is a liquid chamber 19 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.
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.

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 a lower surface 13 c of the elastic body 13 at a part of the wall surface, and a second rubber film 13 b which covers the elastic body 13 and the inner peripheral surface of the first mounting member 11 in a liquid tight manner It is an enclosed space, and 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 1 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. .

The partition member 16 is formed with a restriction passage 24 communicating the main liquid chamber 14 and the sub liquid chamber 15. The restricted passage 24 includes a first communication portion 26 opening to the main liquid chamber 14, a second communication portion 27 opening to the sub liquid chamber 15, and a main flow passage connecting the first communication portion 26 and the second communication portion 27. It is equipped with 25.
The first communication portion 26 opens upward from the main flow path 25 to the main liquid chamber 14, and the second communication portion 27 opens downward from the main flow path 25 to the sub liquid chamber 15.

Further, in the present embodiment, in the main body flow path 25, the other of the first communication portion 26 and the second communication portion 27 is connected to the connection portion with at least one of the first communication portion 26 and the second communication portion 27. The first introduction chamber 31 and the second introduction chamber 32 are disposed in this order in the flow direction from the side toward the one side. In the illustrated example, the first introduction chamber 31 and the second introduction chamber 32 in the flow channel direction from the second communication portion 27 toward the first communication portion 26 at the connection portion of the main body flow channel 25 with the first communication portion 26. Are arranged in this order.

The flow channel direction in the connection portion with the first communication portion 26 in the main body flow channel 25 substantially coincides with the axial direction. The first communication portion 26, the second introduction chamber 32, and the first introduction chamber 31 are arranged in this order from the top to the bottom.
The first introduction chamber 31 and the second introduction chamber 32 communicate with each other through the middle communicating portion 33 of the cross-sectional area smaller than the cross-sectional area along the direction orthogonal to the flow path direction in the first introduction chamber 31.
The cross-sectional areas of the middle communication portion 33 and the second introduction chamber 32 are equal to each other. The cross-sectional areas of the middle communication portion 33 and the second introduction chamber 32 may be different from each other.
The cross sectional area of each of the first introduction chamber 31, the second introduction chamber 32, and the middle communication portion 33 is a projection area in the axial direction of each of the first introduction chamber 31, the second introduction chamber 32, and the middle communication portion 33. .

The first introduction chamber 31, the second introduction chamber 32, and the middle communicating portion 33 have a circular shape coaxially arranged with the central axis O in a plan view as viewed from the axial direction. The axial size of the second introduction chamber 32 is larger than the axial size of the first introduction chamber 31. The volume of the second introduction chamber 32 is smaller than the volume of the main liquid chamber 14 in which the first communication portion 26 directly connected to the second introduction chamber 32 opens.

In the main body flow channel 25, the second communication portion 27 is a portion located closer to the second communication portion 27 than the first introduction chamber 31, that is, a portion located rearward of the first introduction chamber 31 in the flow direction. And an outer communication portion 35 communicating the main flow passage 34 and the first introduction chamber 31 in the radial direction. The main flow passage 34 and the second communication portion 27 are located radially outward of the first introduction chamber 31.

The main flow path 34 is disposed over an angular range of 180 ° or more and less than 360 ° around the central axis O. The outer communication portion 35 extends radially inward from the front end portion of the main flow channel 34 in the flow channel direction, and opens to the first introduction chamber 31. The cross-sectional area of the first introduction chamber 31 is larger than the cross-sectional area of each of the main flow passage 34 and the outer communication portion 35. The cross-sectional area of the outer communication portion 35 is smaller than the cross-sectional area of the main flow passage 34. The cross-sectional area of the outer communication portion 35 may be equal to or larger than the cross-sectional area of the main flow passage 34.
The cross-sectional area of the main flow channel 34 is a projected area of the main flow channel 34 in the circumferential direction. The cross-sectional area of the outer communication portion 35 is a projection area of the outer communication portion 35 in the radial direction.

The second introduction chamber 32 of the main body flow channel 25 and the main liquid chamber 14 are axially separated by a first barrier 36 whose front and back surfaces face in the axial direction. The first barrier 36 is formed in a plate shape having a circular shape when viewed in the axial direction, and is disposed coaxially with the central axis O.
The first communication portion 26 includes a plurality of pores 26 a axially penetrating the first barrier 36 facing the main fluid chamber 14. The plurality of pores 26 a are equally spaced all over the first barrier 36.

Each of the plurality of pores 26a has an opening area smaller than the minimum value of the cross-sectional area of the main flow passage 25 and is disposed inside the second introduction chamber 32 in a plan view seen from the axial direction. The sum of the open areas of the plurality of pores 26 a may be, for example, 1.5 times or more and 4.0 times or less of the minimum value of the cross-sectional area of the main flow path 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.

The main flow passage 34 is formed on the outer peripheral surface of the partition member 16. The main flow passage 34 is disposed coaxially with the central axis O, and is disposed at the upper side with an annular second barrier 37 whose front and back faces face in the axial direction, and coaxially disposed with the central axis O, and located at the lower side An annular third barrier 38 whose back surface faces in the axial direction, and inner peripheral edges of the second barrier 37 and the third barrier 38 are connected to each other, and is defined by a groove bottom 39 which faces radially outward. The second barrier 37 faces the main fluid chamber 14, the third barrier 38 faces the sub fluid chamber 15, and the second communication portion 27 is constituted by one opening penetrating the third barrier 38 in the axial direction. ing. The second communication portion 27 opens at a rear end portion in the flow passage direction of the main flow passage 34. The opening area of the second communication portion 27 is larger than the opening area of the pores 26a.

Here, the partition member 16 is configured such that the upper member 44 and the lower member 45 are stacked in the axial direction. The upper member 44 is formed in a flat, toped tubular shape, and the lower member 45 is formed in a plate shape. The partition member 16 may be integrally formed in its entirety.

The upper member 44 is formed in a two-step cylindrical shape in which the lower inner diameter is larger than the upper inner diameter, and the lower portion of the upper member 44 is the first introduction chamber 31 and the upper The part located at the position is the second introduction chamber 32. The outer peripheral surface of the upper member 44 is a groove bottom 39, and the outer communication portion 35 is open at the front end in the channel direction of the groove bottom 39. The top surface of the top wall of the upper member 44 is a flat surface extending in the direction orthogonal to the axial direction over the entire area. A central portion of the top wall of the upper member 44 is a first barrier 36, and a first communication portion 26 is formed in the first barrier 36. A second barrier 37 is formed on the outer peripheral surface of the upper end portion of the upper member 44 and protrudes outward in the radial direction, and is fitted in the first mounting member 11 via the second rubber film 13 b.

The lower member 45 has a circular shape in a plan view, and is a flat surface extending in the direction orthogonal to the axial direction across the entire surface. The lower member 45 is fitted in the first mounting member 11 via the second rubber film 13 b. Of the lower member 45, the outer peripheral edge located radially outward of the portion where the lower end opening edge of the upper member 44 is in contact serves as a third barrier 38 axially facing the second barrier 37 There is.

In the vibration damping device 1 having such a configuration, at the time of vibration input, the two mounting

members

11 and 12 relatively displace while elastically deforming the elastic body 13. Then, the fluid pressure in the main fluid chamber 14 fluctuates, and the liquid L in the main fluid chamber 14 flows into the sub fluid chamber 15 through the limiting passage 24, and the liquid L in the sub fluid chamber 15 is limited in the limiting passage 24. Flows into the main liquid chamber 14 through the

According to the vibration control device 1 of the present embodiment, the cross-sectional area of the first introduction chamber 31 is an external communication portion located closer to the second communication portion 27 than the first introduction chamber 31 in the main flow passage 25. Since the cross sectional area of the main flow passage 34 and the main flow passage 34 is larger, a large load (vibration) is input to the vibration damping device 1, and the liquid L flowing from the second communication portion 27 into the restriction passage 24 is the first communication portion. In the process of reaching 26, when flowing into the first introduction chamber 31, the flow passage cross-sectional area of the liquid L expands, and a large pressure fluctuation occurs. Therefore, when the liquid L from the second communication portion 27 flows into the first introduction chamber 31, air bubbles are easily generated. Furthermore, prior to the liquid L flowing into the second introduction chamber 32, it passes through the middle communication portion 33 of the cross-sectional area smaller than the cross-sectional area of the first introduction chamber 31 so that the flow path of the liquid L Since the cross-sectional area is narrowed, a large pressure fluctuation occurs when the liquid L flows into the second introduction chamber 32 from the middle communication portion 33, and air bubbles are easily generated again.
Therefore, when a large load is input to the vibration damping device 1, it becomes possible to reduce the flow velocity of the liquid L from the second communication portion 27 side before reaching the first communication portion 26, The flow velocity of the liquid L flowing into the main liquid chamber 14 from the restriction passage 24 can be suppressed, and generation of air bubbles in the main liquid chamber 14 can be suppressed.

Moreover, since the first communication portion 26 includes the plurality of pores 26 a penetrating the first barrier 36 facing the main liquid chamber 14, the bubbles generated in the first introduction chamber 31 and the second introduction chamber 32 become the main liquid It is difficult to enter the chamber 14, and it becomes easy to stay in the first introduction chamber 31 and the second introduction chamber 32. Therefore, it becomes possible to make it difficult to grow the bubbles generated in the first introduction chamber 31 and the second introduction chamber 32. Even if cavitation collapse in which the bubbles collapse occurs, it is possible to suppress the abnormal noise small. it can.
Further, even if air bubbles in the second introduction chamber 32 enter the main liquid chamber 14, it is possible to separate the air bubbles in the main liquid chamber 14 by passing through the plurality of pores 26 a. Also, it is possible to suppress the coalescence of the air bubbles and to easily maintain the air bubbles in a finely dispersed state.
As mentioned above, generation | occurrence | production of the noise resulting from cavitation collapse can be suppressed effectively.

In addition, since the volume of the second introduction chamber 32 is smaller and smaller than the volume of the main liquid chamber 14 opened by the first communication portion 26 directly connected to the second introduction chamber 32, a large load on the vibration proofing device 1 Can be reliably suppressed from growing in the second introduction chamber 32 when.

Further, the cross-sectional area of the main flow passage 34 extending from the second communication portion 27 toward the first introduction chamber 31 is larger than the cross-sectional area of the outer communication portion 35 communicating the main flow passage 34 with the first introduction chamber 31. When the liquid L from the second communication portion 27 flows from the main flow passage 34 into the outer communication portion 35, the flow passage cross-sectional area is narrowed. Therefore, when a large load is input to the vibration damping device 1 and the liquid L from the second communication portion 27 flows from the outer communication portion 35 into the first introduction chamber 31, a large pressure fluctuation can be generated. The air bubbles can be reliably generated easily in the first introduction chamber 31.

Next, a vibration proofing apparatus according to a second embodiment of the present invention will be described with reference to FIGS. 3 and 4.
In the second embodiment, the same parts as the constituent elements in the first embodiment are denoted by the same reference numerals, and the description thereof is omitted, and only different points will be described.

The first introduction chamber 41 of the vibration damping device 2 is a vortex chamber that generates a swirling flow of the liquid L according to the flow velocity of the liquid L from the other side of the first communication portion 26 and the second communication portion 27. ing. When the flow velocity of the liquid L flowing into the first introduction chamber 41 is low, the swirling of the liquid L in the first introduction chamber 41 is suppressed, but when the flow velocity of the liquid L is high, within the first introduction chamber 41 A swirling flow of the liquid L is formed.

The first introduction chamber 41 is separated from the second communication portion 27 in the flow channel direction by more than 180 ° around the central axis O. The first introduction chamber 41 protrudes radially inward from the front end portion of the main flow path 34 of the main body flow path 25 in the flow path direction. The first introduction chamber 41 is disposed at a position away from the central axis O. The first introduction chamber 41 has a circular shape in a plan view as viewed from the axial direction, and the central axis of the first introduction chamber 41 extends in the axial direction.
The first introduction chamber 41 generates a swirling flow of the liquid L in accordance with the flow velocity of the liquid L directed from the second communication portion 27 to the first communication portion 26. The first introduction chamber 41 forms a swirling flow of the liquid L in accordance with the flow velocity of the liquid L flowing from the outer communication portion 46. The swirling flow swirls around the central axis of the first introduction chamber 41.

Among the wall surfaces defining the first introduction chamber 41, an upper wall surface facing upward and facing downward, and a lower wall surface facing downward facing downward, each having a flat surface extending in a direction orthogonal to the axial direction It has become. The cross-sectional area of the first introduction chamber 41 is larger than the cross-sectional area of the middle communication portion 43.
The cross sectional area of each of the first introduction chamber 41 and the middle communication portion 43 is a projected area in the axial direction of each of the first introduction chamber 41 and the middle communication portion 43.

The outer communication portion 46 extends linearly in the plan view. The outer communication portion 46 extends in the tangential direction of the inner peripheral surface of the first introduction chamber 41 in the plan view. The circumferential size of the outer communication portion 46 is smaller than the inner diameter of the first introduction chamber 41. The axial sizes of the outer communication portion 46 and the first introduction chamber 41 are equal to each other. The liquid L flowing from the outer communication portion 46 into the first introduction chamber 41 flows in the outer communication portion 46 and is rectified in the tangential direction, and then flows along the inner circumferential surface of the first introduction chamber 41. To turn. The cross-sectional area of the outer communication portion 46 is smaller than the cross-sectional area of the main flow passage 34. The cross sectional area of the outer communication portion 46 may be equal to or larger than the cross sectional area of the main flow passage 34. The cross-sectional area of the outer communication portion 46 is a projection area of the outer communication portion 46 in the tangential direction.

The cross sectional area of the second introduction chamber 42 is larger than the cross sectional area of the middle communication portion 43. The cross-sectional area of the second introduction chamber 42 may be equal to or less than the cross-sectional area of the middle communication portion 43. The cross sectional area of the second introduction chamber 42 is a projected area in the axial direction of the second introduction chamber 42. As shown in FIG. 4, the cross sectional area of the second introduction chamber 42 is smaller than the cross sectional area of the first introduction chamber 41. The second introduction chamber 42 and the middle communication portion 43 are formed in a circular shape when viewed from the axial direction.

The second introduction chamber 42 is disposed so as to be inscribed in the first introduction chamber 41 as viewed in the axial direction.
In the illustrated example, the second introduction chamber 42 is located in an inner peripheral surface of the first introduction chamber 41 in a portion facing the outer communication portion 46 across the central axis of the first introduction chamber 42 when viewed from the axial direction. I am in touch. The middle communication portion 43 is disposed coaxially with the second introduction chamber 42. The axial sizes of the second introduction chamber 42, the middle communication portion 43, and the first introduction chamber 41 are equal to one another. The volume of the second introduction chamber 42 is smaller than the volume of the main liquid chamber 14 in which the first communication portion 26 directly connected to the second introduction chamber 42 opens.

The lower side member 48 of the partition member 16 is formed in a disk shape, and the outer peripheral surface is a groove bottom surface 39.
The outer communication portion 46 is open at the front end portion of the groove bottom surface 39 in the channel direction. A third barrier 38 is formed on the outer peripheral surface of the lower end portion of the lower member 48 so as to protrude outward in the radial direction and be fitted in the first mounting member 11 via the second rubber film 13 b. . The second introduction chamber 42 is opened at the upper surface of the lower member 48.

The upper member 47 of the partition member 16 is formed in a disk shape, and is placed on the upper surface of the lower member 48 to close the second introduction chamber 42. The upper member 47 is fitted in the first mounting member 11 via the second rubber film 13 b. Of the upper member 47, the portion closing the second introduction chamber 42 of the lower member 48 is the first barrier 36, and the outer peripheral edge axially opposed to the third barrier 38 of the lower member 48 is the 2 barrier 37 has become.

According to the vibration control device 2 of the present embodiment, in addition to the above-described effects of the vibration control device 1 of the first embodiment, the following effects are achieved.
That is, when a large load is input and the liquid L flows into the first introduction chamber 41 from the second communicating portion 27 side, the flow velocity of the liquid L is sufficiently high, and the first introduction chamber When a swirling flow of the liquid L is formed in the space 41, the energy loss due to the formation of the swirling flow, the energy loss due to the friction between the liquid L and the inner surface of the first introduction chamber 41, etc. , The pressure loss of the liquid L can be increased. Therefore, when a large load is input to the vibration damping device 2, it is possible to reliably reduce the flow velocity of the liquid L from the second communication portion 27 before reaching the first communication portion 26. The flow velocity of the liquid flowing into the main liquid chamber 14 from the restriction passage 24 can be suppressed, and the generation of air bubbles in the main liquid chamber 14 can be reliably suppressed.

Further, since the cross-sectional area of the second introduction chamber 42 is larger than the cross-sectional area of the middle communication portion 43, a large load is input to the vibration damping device 2, and the liquid L from the first introduction chamber 41 is the middle communication portion. When it passes through 43 and flows into the second introduction chamber 42, the flow passage cross-sectional area of the liquid L is expanded, and a large pressure fluctuation can be generated, and bubbles are reliably generated in the second introduction chamber 42. It can be done.

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.

In the embodiment, the

first introduction chambers

31 and 41, the

second introduction chambers

32 and 42, and the

middle communication portions

33 and 43 are disposed in the connection portion of the main flow path 25 with the first communication portion 26. However, it may be disposed at the connecting portion of the main flow passage 25 with the second communication portion 27, or the connecting portion of the main flow passage 25 with the first communication portion 26 and the second communication of the main flow passage 25. You may arrange | position to both of a connection part with the part 27. FIG.
Moreover, in the said embodiment, although the 1st communication part 26 is provided with the several pore 26a, both the 1st communication part 26 and the 2nd communication part 27 may be provided with the several pore.

In the embodiment, the flow passage direction in the connection portion of the main flow passage 25 with the first communication portion 26 is substantially the same as the axial direction, but the flow direction is, for example, the radial direction or the circumferential direction. You may
Moreover, in the said embodiment, although the 1st

introductory chamber

31 and 41, the 2nd

introductory chamber

32 and 42, and the

middle communicating parts

33 and 43 were arranged in line in the axial direction, for example, radial direction or circumferential direction You may arrange side by side.
In the above embodiment, the volume of the

second introduction chamber

32, 42 is smaller than the volume of the main liquid chamber 14 in which the first communication portion 26 directly connected to the

second introduction chamber

32, 42 opens. The volume of the

second introduction chambers

32 and 42 may be equal to or greater than the volume of the main liquid chamber 14.

Further, in the above embodiment, the compression type

vibration damping device

1 and 2 in which the positive pressure acts on the main fluid chamber 14 by the support load acting on the main fluid chamber 14 is described. In addition, the auxiliary liquid chamber 15 is mounted so as to be positioned on the upper side in the vertical direction, and a suspension load can be applied to a suspension type vibration damping device in which a negative pressure acts on the main liquid chamber 14.

In the above 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 in a part of the wall and the sub liquid chamber 15. It is not limited to this. For example, instead of providing the diaphragm 20, a pair of elastic bodies 13 in the axial direction 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 may be provided. Good. 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 two liquid chambers has the elastic body 13 in a part of the wall surface.

Further, the

vibration control devices

1 and 2 according to the present invention are not limited to the engine mount of a vehicle, and can be applied to other than the engine mount. For example, the invention can also be applied to a mount of a generator mounted on a construction machine, or to a mount of a machine installed in a factory or the like.

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 in the first fluid chamber and the second fluid chamber is varied, and the fluid passes through the restricted passage. It tries to circulate between the first fluid chamber and the second fluid chamber. At this time, the liquid flows into the restriction passage through one of the first communication portion and the second communication portion, and after passing through the main body flow path, from the restriction passage through the other of the first communication portion and the second communication portion. leak.
Here, the cross-sectional area of the first introduction chamber is larger than the cross-sectional area of a portion of the main flow passage that is located on the other side of the first communication portion and the second communication portion than the first introduction chamber. Because a large load (vibration) is input to the vibration isolation device, the liquid flowing into the restricted passage from the other of the first communication portion and the second communication portion is the first communication portion and the second communication portion. In the process of reaching one of the two, when flowing into the first introduction chamber, the flow passage cross-sectional area of the liquid expands and a large pressure fluctuation occurs. Therefore, when the liquid from the other side of the first communication portion and the second communication portion flows into the first introduction chamber, bubbles are easily generated. Further, prior to the liquid flowing into the second introduction chamber, the flow passage cross-sectional area of the liquid is narrowed by passing through the middle communication portion of the cross-sectional area smaller than the cross-sectional area of the first introduction chamber. Therefore, when the liquid flows from the middle communication part into the second introduction chamber, a large pressure fluctuation occurs, and air bubbles are likely to be generated again.
Therefore, when a large load is input to the antivibration device, it is possible to reduce the flow velocity of the liquid from the other side of the first communication portion and the second communication portion before reaching one of them. As a result, the flow velocity of the liquid flowing from the restriction passage into the first liquid chamber or the second liquid chamber can be suppressed, and the generation of air bubbles in this liquid chamber can be suppressed.
Moreover, since at least one of the first communication portion and the second communication portion includes a plurality of pores penetrating the barrier facing the first liquid chamber or the second liquid chamber, the first introduction chamber and the second introduction chamber The air bubbles generated in the above-described method can not easily enter the first liquid chamber or the second liquid chamber, and easily stay in the first introduction chamber and the second introduction chamber. Therefore, it becomes possible to make it difficult to grow the bubbles generated in the first introduction chamber and the second introduction chamber, and even if cavitation collapse in which the bubbles collapse occurs, it is possible to suppress the generated abnormal noise to a small extent.
In addition, even if air bubbles in the second introduction chamber enter the first liquid chamber or the second liquid chamber, the air bubbles are separated in the first liquid chamber or the second liquid chamber by passing through the plurality of pores. It is possible to reduce the coalescence of the air bubbles and make it easy to maintain the air bubbles in a finely dispersed state.
As mentioned above, generation | occurrence | production of the noise resulting from cavitation collapse can be suppressed effectively.

Here, the volume of the second introduction chamber is smaller than the volume of the liquid chamber opened by one of the first communication unit and the second communication unit among the first liquid chamber and the second liquid chamber. May be

In this case, the volume of the second introduction chamber is smaller and smaller than the volume of the liquid chamber in which one of the first communication portion and the second communication portion of the first liquid chamber and the second liquid chamber opens. Therefore, when a large load is input to the antivibration device, it is possible to reliably suppress the growth of air bubbles in the second introduction chamber.

In the main flow path, a portion of the first communication unit and the second communication unit located on the other side of the first introduction chamber is the first communication unit and the second communication unit. A main flow passage extending from the other of the two toward the first introduction chamber, and an external communication portion connecting the main flow passage and the first introduction chamber, and the cross-sectional area of the external communication portion is the It may be smaller than the cross-sectional area of the main channel.

In this case, when the liquid from the other of the first communication portion and the second communication portion flows from the main flow path into the outer communication portion, the flow path cross-sectional area is narrowed, so a large load is input to the vibration control device. When the liquid from the other of the first communication portion and the second communication portion flows into the first introduction chamber from the outer communication portion, a large pressure fluctuation can be generated, and the first introduction chamber Air bubbles can be easily generated with certainty.

Moreover, the cross-sectional area of the second introduction chamber may be larger than the cross-sectional area of the middle communication portion.

In this case, since the cross-sectional area of the second introduction chamber is larger than the cross-sectional area of the middle communication portion, a large load is input to the antivibration device, and the liquid from the first introduction chamber passes through the middle communication portion. When the liquid flows into the second introduction chamber, the flow passage cross-sectional area of the liquid expands to cause a large pressure fluctuation, and bubbles can be reliably generated in the second introduction chamber.

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, and the above-described modifications may be combined as appropriate.

According to the vibration control device of the present invention, it is possible to effectively suppress the generation of abnormal noise caused by cavitation collapse.

1, 2 Anti-vibration device 11 First mounting member 12 Second mounting member 13 Elastic body 14 Main fluid chamber (first fluid 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

31, 41

1st introduction chamber

32, 42

2nd introduction chamber

33, 43 Middle communicating part 34

Main flow path

35 , 46 External communication part 36 1st barrier 38 3rd barrier L liquid

Claims

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 any other of the vibration generating portion and the vibration receiving portion ,
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
In the main body flow channel, the connection portion with at least one of the first communication portion and the second communication portion is directed from the other side of the first communication portion and the second communication portion to the one side. The first introduction chamber and the second introduction chamber are disposed in this order in the flow direction,
The cross-sectional area of the first introduction chamber along the direction orthogonal to the flow passage direction is the same as that of the first communication portion and the second communication portion in the main flow passage than in the first introduction chamber. Larger than the cross-sectional area of the part located on the other side,
The first introduction chamber and the second introduction chamber communicate with each other through a middle communication portion of the cross-sectional area smaller than the cross-sectional area of the first introduction chamber,
At least one of the first communication portion and the second communication portion includes a plurality of pores penetrating a barrier facing the first liquid chamber or the second liquid chamber.
The volume of the second introduction chamber is smaller than the volume of the liquid chamber opened by one of the first communication portion and the second communication portion among the first liquid chamber and the second liquid chamber. Vibration isolation device according to.
Of the main body flow path, a portion of the first communication portion and the second communication portion located on the other side of the first introduction chamber is a portion of the first communication portion and the second communication portion. A main flow passage extending from the other side toward the first introduction chamber, and an external communication portion connecting the main flow passage and the first introduction chamber,
The anti-vibration device according to claim 1, wherein the cross-sectional area of the outer communication portion is smaller than the cross-sectional area of the main flow passage.
The anti-vibration device according to claim 1, wherein the cross-sectional area of the second introduction chamber is larger than the cross-sectional area of the middle communication portion.
Of the main body flow path, a portion of the first communication portion and the second communication portion located on the other side of the first introduction chamber is a portion of the first communication portion and the second communication portion. A main flow passage extending from the other side toward the first introduction chamber, and an external communication portion connecting the main flow passage and the first introduction chamber,
The anti-vibration device according to claim 2, wherein the cross-sectional area of the outer communication portion is smaller than the cross-sectional area of the main flow passage.
The anti-vibration device according to claim 2, wherein the cross-sectional area of the second introduction chamber is larger than the cross-sectional area of the middle communication portion.
The anti-vibration device according to claim 3, wherein the cross-sectional area of the second introduction chamber is larger than the cross-sectional area of the middle communication portion.
The anti-vibration device according to claim 5, wherein the cross-sectional area of the second introduction chamber is larger than the cross-sectional area of the middle communication portion.