JP6822860B2 - Anti-vibration device - Google Patents

Description

The present invention relates to a vibration isolator that is applied to, for example, automobiles, industrial machines, etc., and absorbs and attenuates vibrations of vibration generating parts such as engines.

Conventionally, as this kind of vibration isolation device, a tubular first mounting member connected to one of a vibration generating portion and a vibration receiving portion, a second mounting member connected to the other, and both mountings thereof. It is known that the structure includes an elastic body for connecting the members and a partition member for 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. The partition member is formed with a restricted passage connecting the main liquid chamber and the sub liquid chamber. In this vibration isolation device, when vibration is input, both mounting members are relatively displaced while elastically deforming the elastic body, and the hydraulic pressure in the main liquid chamber is fluctuated to allow the liquid to flow through the limiting passage to absorb the vibration. And decaying.

By the way, in this vibration isolator, for example, a large load (vibration) is input due to unevenness of the road surface, the hydraulic pressure in the main liquid chamber rises sharply, and then the load is input in the opposite direction due to the rebound of the elastic body or the like. Occasionally, the main fluid chamber may suddenly become negatively pressurized. Then, this rapid negative pressure causes cavitation in which a large number of bubbles are generated in the liquid, and further, abnormal noise may be generated due to cavitation collapse in which the generated bubbles collapse.
Therefore, for example, by providing a valve body in the restricted passage as in the anti-vibration device shown in Patent Document 1 below, even when a vibration having a large amplitude is input, the main liquid chamber can be made negative pressure. The structure to suppress is known.

Japanese Unexamined Patent Publication No. 2012-172832

However, in the conventional anti-vibration device, since the valve body is provided, the structure becomes complicated and the valve body needs to be tuned, so that there is a problem that the manufacturing cost increases. Further, by providing the valve body, the degree of freedom in design is lowered, and as a result, the vibration isolation characteristics may be lowered.

The present invention has been made in view of the above circumstances, and an object of the present invention is to provide an anti-vibration device capable of suppressing the generation of abnormal noise due to cavitation collapse without deteriorating the anti-vibration characteristics with a simple structure. To do.

In order to solve the above problems, the present invention proposes the following means.
The vibration isolator according to the present invention includes a tubular first mounting member connected to one of a vibration generating portion and a vibration receiving portion, a second mounting member connected to the other, and both mounting members. The partition member is provided with an elastic body that elastically connects the two, and a partition member that divides the liquid chamber in the first mounting member in which the liquid is sealed into a first liquid chamber and a second liquid chamber. , A liquid-filled type anti-vibration device in which a limiting passage for communicating the first liquid chamber and the second liquid chamber is formed, and the limiting passage is a first communication portion that opens into the first liquid chamber. A second communication section that opens into the second liquid chamber, and a main body flow path that communicates the first communication section with the second communication section, and is one of the first communication section and the second communication section. At least one includes a plurality of pores penetrating the barrier facing the first liquid chamber or the second liquid chamber, and a spiral groove extending around the central axis of the pores is provided on the inner peripheral surface of the pores. The plurality of pores are formed and arranged at intervals in the flow path direction of the main body flow path, and are separated from the other of the first communication portion and the second communication portion in the flow path direction. It is characterized in that the liquid is formed so that the flow resistance of the liquid increases as the liquid is located .

The vibration isolator according to the present invention includes a tubular first mounting member connected to one of a vibration generating portion and a vibration receiving portion, a second mounting member connected to the other, and both mounting members. The partition member is provided with an elastic body that elastically connects the two, and a partition member that divides the liquid chamber in the first mounting member in which the liquid is sealed into a first liquid chamber and a second liquid chamber. , A liquid-filled type anti-vibration device in which a limiting passage for communicating the first liquid chamber and the second liquid chamber is formed, and the limiting passage is a first communication portion that opens into the first liquid chamber. A second communication section that opens into the second liquid chamber, and a main body flow path that communicates the first communication section with the second communication section, and is one of the first communication section and the second communication section. At least one includes a plurality of pores penetrating the barrier facing the first liquid chamber or the second liquid chamber, and the pores extend spirally in the thickness direction of the barrier and the plurality of fine particles. The holes are arranged at intervals in the flow path direction of the main body flow path, and are located apart from the other of the first communication portion and the second communication portion in the flow path direction. It is characterized in that it is formed so as to increase the flow resistance of the liquid .

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 hydraulic pressure of at least one of the first liquid chamber and the second liquid chamber fluctuates. Then, the liquid tries to flow between the first liquid chamber and the second liquid chamber through the restricted passage. At this time, the liquid flows into the restricted passage through one of the first 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. Outflow from.
Here, when the liquid flows out from the limiting passage to the first liquid chamber or the second liquid chamber through the plurality of pores, the liquid flows through each pore while being pressure-lossed by the barrier formed by these pores. Therefore, the flow velocity of the liquid flowing into the first liquid chamber or the second liquid chamber can be suppressed. Moreover, since the liquid flows through a plurality of pores instead of a single pore, the liquid can be branched and circulated in a plurality of pores, and the flow velocity of the liquid passing through the individual pores can be reduced. Can be done. As a result, even if a large load (vibration) is input to the vibration isolator, the liquid that has passed through the pores and has flowed into the first liquid chamber or the second liquid chamber and the liquid that has flowed into the first liquid chamber or the second liquid chamber and the first liquid chamber or the second liquid chamber. It is possible to suppress the difference in flow velocity between the liquid and the liquid, and it is possible to suppress the generation of vortices due to the difference in flow velocity and the generation of bubbles due to this vortex. Further, 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 separated from each other in the first liquid chamber or the second liquid chamber by passing the liquid through a plurality of pores. It becomes possible to separate the bubbles in the liquid chamber, suppress the merging and growth of the bubbles, and facilitate the maintenance of the bubbles in a finely dispersed state.
As described above, it is possible to suppress the generation of bubbles themselves, and even if bubbles are generated, it is possible to easily maintain the state in which the bubbles are finely dispersed, so that cavitation collapse occurs in which the bubbles collapse. However, the generated abnormal noise can be suppressed to a small level.

In particular, since spiral grooves are formed on the inner peripheral surface of the pores or the pores extend spirally in the thickness direction of the barrier, the main body when a large load is applied to the vibration isolator. By swirling the liquid flowing into the pores from the flow path in the pores, the flow velocity of the liquid can be reduced, and the above-mentioned flow velocity difference can be surely suppressed to a small size. Further, even if bubbles are generated in the restricted passage, the bubbles can flow into the first liquid chamber or the second liquid chamber while swirling in the pores, so that the bubbles can flow into the first liquid chamber or the second liquid chamber. It is possible to surely suppress the merging of air bubbles in the room.

Here, the plurality of pores are arranged at intervals in the flow path direction of the main body flow path, and are separated from the other of the first communication portion and the second communication portion in the flow path direction. It is formed so that the flow resistance of the liquid increases as it is located .

In this case, when the liquid flowing in the main body flow path reaches one of the first communication portion and the second communication portion, among the plurality of pores, the first communication portion and the second communication portion. It is possible to prevent the pores located on the other side from passing through the pores due to inertial force. As a result, the liquid can easily flow into the pores located on the other side from the main body flow path, and the flow velocity of the liquid flowing from each pore into the first liquid chamber or the second liquid chamber is made uniform and locally. It can be suppressed from becoming faster. Therefore, it is possible to more effectively suppress the generation of abnormal noise due to the generation of bubbles and the collapse of cavitation.

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

It is a vertical sectional view of the vibration isolation device which concerns on one Embodiment of this invention. It is a top view of the partition member constituting the vibration isolation device shown in FIG. It is a perspective view of the partition member shown in FIG. It is a perspective view of the partition member which comprises the vibration isolation device which concerns on other embodiment of this invention.

Hereinafter, embodiments of the vibration isolator according to the present invention will be described with reference to FIGS. 1 to 3.
As shown in FIG. 1, the vibration isolator 10 is attached to a tubular first mounting member 11 connected to either one of the vibration generating portion and the vibration receiving portion and to either one of the vibration generating portion and the vibration receiving portion. The second mounting member 12 to be connected, the elastic body 13 elastically connecting the first mounting member 11 and the second mounting member 12 to each other, and the main liquid chamber (first liquid chamber) described later in the first mounting member 11. ) 14, A liquid-filled type anti-vibration device including a partition member 16 for partitioning into a secondary liquid chamber (second liquid chamber) 15.

Hereinafter, the direction along the central axis O of the first mounting member 11 is referred to as an axial direction. Further, the second mounting member 12 side along the axial direction is referred to as an upper side, and the partition member 16 side is referred to as a lower side. Further, in a plan view of the vibration isolator 10 from the axial direction, the direction orthogonal to the central axis O is referred to as the radial direction, and the direction orbiting 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 a plan view, and are arranged coaxially with the central axis O.

When the vibration isolator 10 is mounted on an automobile, for example, the second mounting member 12 is connected to the engine as a vibration generating portion, and the first mounting member 11 is connected to the vehicle body as a vibration receiving portion. As a result, the vibration of the engine is suppressed from being transmitted to the vehicle body.

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

The elastic body 13 is a rubber body that is vulcanized and adhered to the upper end opening of the first mounting member 11 and the outer peripheral surface of the lower portion of the second mounting member 12, and is interposed between them. The upper end opening of the mounting member 11 is closed from above. The upper end of the elastic body 13 comes into contact with the flange portion 12a of the second mounting member 12, so that the elastic body 13 is sufficiently in close contact with the second mounting member 12 and follows the displacement of the second mounting member 12 satisfactorily. ing. At the lower end of the elastic body 13, a rubber film 17 that tightly covers the inner peripheral surface of the first mounting member 11 and the inner peripheral portion of the lower end opening edge is integrally formed. As the elastic body 13, it is also possible to use an elastic body made of synthetic resin or the like in addition to rubber.

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

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

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

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

The liquid chamber 19 is divided into a main liquid chamber 14 and a sub liquid chamber 15 by a partition member 16. The main liquid chamber 14 is formed by forming the lower surface 13a of the elastic body 13 as a part of the wall surface, and the rubber film 17 and the partition member 16 that tightly cover the inner peripheral surfaces of the elastic body 13 and the first mounting member 11 It is a space surrounded by and, and the internal volume changes due to the deformation of the elastic body 13. The auxiliary liquid 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 isolator 10 having such a configuration is a compression type device used by attaching the main liquid chamber 14 so as to be located on the upper side in the vertical direction and the sub liquid chamber 15 to be located on the lower side in the vertical direction. ..

A holding groove 16b for holding the lower end of the rubber film 17 in a liquid-tight manner is formed on the upper surface of the outer peripheral portion 22 of the partition member 16 on the main liquid chamber 14 side, whereby the outer periphery of the rubber film 17 and the partition member 16 is formed. The space between the portion 22 and the upper surface is tightly closed. The partition member 16 is provided with a restriction passage 24 that communicates the main liquid chamber 14 and the sub liquid chamber 15.

The restriction passage 24 connects the main body flow path 25 arranged in the partition member 16, the first communication portion 26 that communicates the main body flow path 25 and the main liquid chamber 14, and the main body flow path 25 and the sub liquid chamber 15. It is provided with a second communication unit 27 that communicates with the user.
The main body flow path 25 extends in the partition member 16 along the circumferential direction, and the flow path direction and the circumferential direction of the main body flow path 25 are in the same direction. The main body flow path 25 is formed in an arc shape coaxially arranged with the central axis O, and extends along the circumferential direction over substantially half a circumference. The main body flow path 25 is defined by a first barrier 28 facing the main liquid chamber 14 and a second barrier 29 facing the sub liquid chamber 15 among the partition members 16. Both the first barrier 28 and the second barrier 29 are formed in a plate shape with the front and back surfaces facing in the axial direction. The first barrier 28 is axially sandwiched between the main body flow path 25 and the main liquid chamber 14, and is located between the main body flow path 25 and the main liquid chamber 14. The second barrier 29 is axially sandwiched between the main body flow path 25 and the auxiliary liquid chamber 15, and is located between the main body flow path 25 and the auxiliary liquid chamber 15.

The second communication portion 27 includes one opening 33 that penetrates the second barrier 29 in the axial direction. The opening 33 is arranged in a portion of the second barrier 29 that forms one end along the circumferential direction of the main body flow path 25.
The first communication portion 26 includes a plurality of pores 31 that penetrate the first barrier 28 in the axial direction and are arranged along the circumferential direction (the flow path direction of the main body flow path 25). The plurality of pores 31 are arranged in a portion of the first barrier 28 that forms the other end along the circumferential direction of the main body flow path 25.
Hereinafter, the one end side of the main body flow path 25 is referred to as one side, and the other end side is referred to as the other side along the circumferential direction.

Each of the plurality of pores 31 is smaller than the flow path cross-sectional area of the main body flow path 25, and is arranged inside each of the first barrier 28 and the main body flow path 25 in a plan view. The lengths of the plurality of pores 31 are equal to each other.
The plurality of pores 31 are formed so that the flow resistance of the liquid L increases as the pores 31 are located apart from the second communication portion 27 in the circumferential direction. In the illustrated example, the plurality of pores 31 are formed so that the inner diameter of each pore 31 in the central axis O1 direction becomes smaller as the pores 31 are located apart from the second communication portion 27 in the circumferential direction. There is. The plurality of pores 31 may be formed so that the minimum value of the inner diameter becomes smaller as the pores 31 are located apart from the second communication portion 27 in the circumferential direction.
A plurality of pores 31 are formed in the first barrier 28 at equivalent positions along the circumferential direction at radial intervals. In the illustrated example, two pores 31 are formed in the first barrier 28 at intervals in the radial direction. The pores 31 adjacent to each other in the radial direction are formed to have the same shape and the same size.

Each of the plurality of pores 31 is gradually reduced in diameter from the main body flow path 25 side toward the main liquid chamber 14 side along the axial direction, that is, from the inner side to the outer side in the axial direction, and the taper angle is, for example, about 30. It is formed in a truncated cone shape, and in all the pores 31, the open end (hereinafter, referred to as “open end”) on the main liquid chamber 14 side is the minimum inner diameter and the cross-sectional area of the flow path. The opening area of the opening end of the pore 31 may be, for example, 25 mm ² or less, preferably 0.7 mm ² or more and 17 mm ² or less.
The channel cross-sectional area of the entire first communication portion 26, which is the sum of the opening areas at the opening ends of the plurality of pores 31 for all of the plurality of pores 31, is the minimum value of the channel cross-sectional area in the main body flow path 25. For example, it may be 1.5 times or more and 4.0 times or less. In the illustrated example, the flow path cross-sectional area of the main body flow path 25 is the same over the entire length.

In the present embodiment, a spiral groove 31a extending around the central axis O1 of the pore 31 is formed on the inner peripheral surface of the pore 31. The spiral groove 31a is formed on the inner peripheral surface of the pore 31 over an angle range exceeding 360 ° around the central axis O1 of the pore 31. The spiral groove 31a is formed on the inner peripheral surface of the pore 31 over the entire area in the direction of the central axis O1 of the pore 31. The spiral groove 31a extends on the inner peripheral surface of the pore 31 over a plurality of circumferences around the central axis O1.

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

Then, according to the vibration isolator 10 according to the present embodiment, when the liquid L flows out from the restriction passage 24 to the main liquid chamber 14 through the plurality of pores 31, the first barrier in which these pores 31 are formed is formed. Since each pore 31 flows while being pressure-lossed by 28, the flow velocity of the liquid flowing into the main liquid chamber 14 can be suppressed. Moreover, since the liquid L flows through a plurality of pores 31 instead of a single pore 31, the liquid L can be branched into a plurality of pores 31 and circulated, and the liquid L that has passed through the individual pores 31 can be circulated. The flow velocity can be reduced. As a result, even if a large load is input to the vibration isolator 10, the liquid L that has passed through the pores 31 and has flowed into the main liquid chamber 14 is between the liquid L in the main liquid chamber 14. The generated flow velocity difference can be suppressed to be small, and the generation of vortices due to the flow velocity difference and the generation of bubbles due to the vortices can be suppressed. Further, even if bubbles are generated in the restricted passage 24 instead of the main liquid chamber 14, the generated bubbles are separated from each other in the main liquid chamber 14 by passing the liquid L through the plurality of pores 31. This makes it possible to prevent the bubbles from merging and growing, making it easier to maintain the bubbles in a finely dispersed state.
As described above, it is possible to suppress the generation of bubbles themselves, and even if bubbles are generated, it is possible to easily maintain the state in which the bubbles are finely dispersed, so that cavitation collapse occurs in which the bubbles collapse. However, the generated abnormal noise can be suppressed to a small level.

Further, since the spiral groove 31a is formed on the inner peripheral surface of the pore 31, the liquid L flowing into the pore 31 from the main body flow path 25 is thinned when a large load is input to the vibration isolator 10. It is possible to reduce the flow velocity of the liquid L by swirling around the central axis O1 of the pore 31 in the hole 31, and the above-mentioned flow velocity difference can be surely suppressed to a small size. Further, even if bubbles are generated in the restricted passage 24, the bubbles can flow into the main liquid chamber 14 while swirling in the pores 31, and the bubbles merge in the main liquid chamber 14. Can be surely suppressed.

Further, since the plurality of pores 31 are formed so that the flow resistance of the liquid L increases as the plurality of pores 31 are located apart from the second communication portion 27 in the circumferential direction, the liquid flowing in the main body flow path 25. When L reaches the first communication portion 26, it is possible to prevent L from passing through the pores 31 located on one side in the circumferential direction among the plurality of pores 31 due to inertial force. As a result, the liquid L can easily flow into the pores 31 located on one side of the pores 31 from the main body flow path 25, and the flow velocity of the liquid L flowing into the main liquid chamber 14 from each pore 31 is made uniform and locally. It can be suppressed from becoming faster. Therefore, it is possible to more effectively suppress the generation of abnormal noise due to the generation of bubbles and the collapse of cavitation.

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

For example, instead of the pore 31 in which the spiral groove 31a is formed on the inner peripheral surface as described above, the pore 32 extending spirally in the thickness direction of the first barrier 28 as shown in FIG. 4 is adopted. You may. Hereinafter, only the points different from the above-mentioned pores 31 will be described.
In the illustrated example, the inner diameters of the pores 32 are equal over the entire thickness direction of the first barrier 28. The openings at both ends of the pores 32 are respectively open in the axial direction. The openings at both ends of the pores 32 are arranged coaxially.

Further, in the above-described embodiment, the configuration is shown in which the inner diameter of the plurality of pores 31 is smaller as the plurality of pores 31 are located apart from the second communication portion 27 in the circumferential direction. A configuration may be adopted in which the length in the central axis O1 direction becomes longer as the distance from the 27 in the circumferential direction increases.
Further, in the above embodiment, the pores 31 and 32 are formed in the first barrier 28, but they may be formed in the second barrier 29 or formed in both the first barrier 28 and the second barrier 29. May be good.
Further, in the above embodiment, a spiral groove 31a is formed on the inner peripheral surface of all the plurality of pores 31 and 32 formed in the first barrier 28 along the circumferential direction, or the thickness of the first barrier 28 is increased. Although the configuration shown in a spiral shape extending in the longitudinal direction is shown, the spiral groove 31a is formed on the inner peripheral surface of the plurality of pores 31 and 32 only those located at the end on the other side in the circumferential direction. It may be formed or may be formed in a spiral shape extending in the thickness direction of the first barrier 28.

Further, in the above-described embodiment, the pores 31 are formed in a truncated cone shape with a gradually reduced diameter, but may be formed in a columnar shape (a straight circular hole shape) or the like.
Further, in the above-described embodiment, the plurality of pores 31 and 32 are formed in a circular shape in a cross-sectional view, but the present invention is not limited to this. For example, the plurality of pores 31 and 32 may be appropriately changed, such as forming a cross-sectional viewing angle shape.
Further, in the above embodiment, the first communication portion 26 includes a plurality of pores 31 and 32, but does not have, for example, the pores 31 and 32, or an opening having a diameter larger than the pores 31 and 32. , And a configuration having both pores 31 and 32 and the like may be adopted. Further, the second communication portion 27 may include a plurality of openings 33 arranged along the circumferential direction (flow path direction of the main body flow path 25).
Further, in the above-described embodiment, the main body flow path 25 extends in the circumferential direction, but the present invention is not limited to this.

Further, in the above embodiment, the partition member 16 is arranged at the lower end portion of the first mounting member 11, and the outer peripheral portion 22 of the partition member 16 is brought into contact with the lower end opening edge of the first mounting member 11, for example. The first mounting member is formed by arranging the member 16 sufficiently above the lower end opening edge of the first mounting member 11 and arranging the diaphragm 20 on the lower side of the partition member 16, that is, on the lower end of the first mounting member 11. The auxiliary liquid chamber 15 may be formed from the lower end of the 11 to the bottom surface of the diaphragm 20.

Further, in the above-described embodiment, the compression type vibration isolator 10 in which a positive pressure acts on the main liquid chamber 14 when a supporting load acts has been described, but the main liquid chamber 14 is located on the lower side in the vertical direction and The auxiliary liquid chamber 15 is attached so as to be located on the upper side in the vertical direction, and can be applied to a suspension type vibration isolator in which a negative pressure acts on the main liquid chamber 14 when a supporting load acts.
Further, in the above-described embodiment, the partition member 16 partitions the liquid chamber 19 in the first mounting member 11 into a main liquid chamber 14 having an elastic body 13 as a part of a wall surface and a 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 auxiliary liquid chamber 15, a pressure receiving liquid chamber having the elastic body 13 as a part of the wall surface may be provided. For example, the partition member 16 partitions the liquid chamber 19 in the first mounting member 11 in which the liquid L is sealed into the first liquid chamber 14 and the second liquid chamber 15, and the first liquid chamber 14 and the second liquid chamber 15 At least one of them can be appropriately modified to another configuration having the elastic body 13 as a part of the wall surface.
Further, the anti-vibration device 10 according to the present invention is not limited to the engine mount of the vehicle, and can be applied to other than the engine mount. For example, it can be applied to a mount of a generator mounted on a construction machine, or it can be applied to a mount of a machine installed in a factory or the like.

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

10 Anti-vibration device 11 1st mounting member 12 2nd mounting member 13 Elastic body 14 Main liquid chamber (1st liquid chamber)
15 Secondary liquid chamber (second liquid chamber)
16 Partition member 19 Liquid chamber 24 Restricted passage 25 Main body flow path 26 First communication part 27 Second communication part 28 First barrier 29 Second barrier 31, 32 Pore 31a Spiral groove O1 Central axis L Liquid

Claims (2)

A tubular first mounting member connected to either one of the vibration generating portion and the vibration receiving portion, and a second mounting member connected to the other.
An elastic body that elastically connects these two mounting members,
A partition member for partitioning the liquid chamber in the first mounting member in which the liquid is sealed into the first liquid chamber and the second liquid chamber is provided, and the liquid chamber is provided.
A liquid-filled type anti-vibration device in which a limiting passage connecting the first liquid chamber and the second liquid chamber is formed in the partition member.
The restricted passage includes a first communication portion that opens into the first liquid chamber, a second communication portion that opens into the second liquid chamber, and a main body flow path that communicates the first communication portion and the second communication portion. With,
At least one of the first communication section and the second communication section includes a plurality of pores penetrating the first liquid chamber or the barrier facing the second liquid chamber.
A spiral groove extending around the central axis of the pore is formed on the inner peripheral surface of the pore .
The plurality of pores are arranged at intervals in the flow path direction of the main body flow path, and are positioned apart from the other of the first communication portion and the second communication portion in the flow path direction. A vibration isolation device characterized in that the more the liquid is formed, the greater the flow resistance of the liquid . A tubular first mounting member connected to either one of the vibration generating portion and the vibration receiving portion, and a second mounting member connected to the other.
An elastic body that elastically connects these two mounting members,
A partition member for partitioning the liquid chamber in the first mounting member in which the liquid is sealed into the first liquid chamber and the second liquid chamber is provided, and the liquid chamber is provided.
A liquid-filled type anti-vibration device in which a limiting passage connecting the first liquid chamber and the second liquid chamber is formed in the partition member.
The restricted passage includes a first communication portion that opens into the first liquid chamber, a second communication portion that opens into the second liquid chamber, and a main body flow path that communicates the first communication portion and the second communication portion. With,
At least one of the first communication section and the second communication section includes a plurality of pores penetrating the first liquid chamber or the barrier facing the second liquid chamber.
The pores spirally extend in the thickness direction of the barrier .
The plurality of pores are arranged at intervals in the flow path direction of the main body flow path, and are positioned apart from the other of the first communication portion and the second communication portion in the flow path direction. A vibration isolation device characterized in that the more the liquid is formed, the greater the flow resistance of the liquid .

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