JP2018194101A - Vibration isolation device - Google Patents

Abstract

To suppress generation of noise caused by cavitation breakdown without degrading vibration control characteristic with a simple structure.SOLUTION: A limiting passage 24 includes a first communication portion 26 opened to a main liquid chamber 14, a second communication portion 27 opened to an auxiliary liquid chamber 15, and a main body flow channel 25 for communicating the first communication portion 26 and the second communication portion 27. At least one of the first communication portion 26 and the second communication portion 27 includes a plurality of pores 31 penetrating through a first barrier 28 facing the main liquid chamber 14. Positions of both end opening portions of the pore 31 are different from each other in a plane view of the first barrier 28, and at least in two of the plurality of pores 31, extending directions from a main body flow channel 25 side toward a main liquid chamber 14 side at an end portion of the main liquid chamber 14 side are different from each other.SELECTED DRAWING: Figure 1

Description

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

Conventionally, as this type of vibration isolator, a cylindrical first attachment member connected to one of the vibration generating portion and the vibration receiving portion, a second attachment member connected to the other, and both An elastic body that elastically connects the mounting member, 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, and the partition member There is known a liquid-filled vibration isolator in which a restriction passage that connects the first liquid chamber and the second liquid chamber is formed.
In this vibration isolator, at the time of vibration input, both attachment members are relatively displaced while elastically deforming the elastic body, and the restriction pressure passage is changed by changing the hydraulic pressure of at least one of the first liquid chamber and the second liquid chamber. Vibration is absorbed and damped by circulating the liquid in the tank.

By the way, in this vibration isolator, a large load (vibration) is input from, for example, road surface unevenness, and the load is input in the opposite direction due to, for example, the rebound of the elastic body after the fluid pressure in the first liquid chamber has rapidly increased. When this is done, the first liquid chamber may suddenly become negative pressure. Then, cavitation in which a large number of bubbles are generated in the liquid due to this sudden negative pressure is generated, and abnormal noise may be generated due to cavitation collapse in which the generated bubbles collapse.
Therefore, for example, as in the vibration isolator shown in Patent Document 1 below, by providing a valve body in the restriction passage, the negative pressure in the first liquid chamber can be reduced even when large amplitude vibration is input. The structure which suppresses is known.

JP2012-172832A

  However, in the conventional vibration isolator, since the structure is complicated by providing the valve body, and tuning of the valve body is necessary, there is a problem that the manufacturing cost increases. In addition, the provision of the valve body has reduced the degree of freedom in design, and as a result, the vibration isolation characteristics may be reduced.

  The present invention has been made in view of the above circumstances, and an object thereof is to provide a vibration isolator capable of suppressing the occurrence of abnormal noise due to cavitation collapse without reducing the vibration isolation characteristics with a simple structure. To do.

  In order to solve the above-described problem, the vibration isolator of the present invention includes a cylindrical first mounting member connected to one of the vibration generating unit and the vibration receiving unit, and a second mounting connected to the other. A member, an elastic body that elastically connects both the mounting members, and a partition member that divides a liquid chamber in the first mounting member in which a liquid is sealed into a first liquid chamber and a second liquid chamber. And a liquid-filled vibration isolator in which a restriction passage communicating the first liquid chamber and the second liquid chamber is formed in the partition member, wherein the restriction passage includes the first liquid chamber A first communication part that opens to the second liquid chamber, a second communication part that opens to the second liquid chamber, and a main body channel that communicates the first communication part and the second communication part, the first communication part and the At least one of the second communication portions penetrates the barrier facing the first liquid chamber or the second liquid chamber. A plurality of pores, and the positions of both end openings in the pores are different from each other in plan view of the barrier, and in at least two of the plurality of pores, the first liquid chamber side or In the end portion on the second liquid chamber side, directions extending from the main body channel side toward the first liquid chamber side or the second liquid chamber side are different from each other.

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 varies. 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. Spill from.
Here, when the liquid flows into the first liquid chamber or the second liquid chamber from the main body flow path through the plurality of pores, the liquid flows through each pore while being pressure-lossed by the barrier in which these pores are formed. Therefore, the flow rate of the liquid flowing into the first liquid chamber or the second liquid chamber can be suppressed.

In addition, since the liquid flows through a plurality of pores instead of a single pore, it is possible to divide the liquid into a plurality of channels and reduce the flow rate of the liquid that has passed through the individual pores. Can do. Accordingly, 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 first liquid chamber or the second liquid chamber It is possible to suppress the difference in flow velocity generated between the liquid and the liquid and the generation of vortices due to the flow velocity difference and the generation of bubbles due to the vortices.
Further, even if bubbles are generated in the main body flow path instead of the first liquid chamber or the second liquid chamber, the generated bubbles are allowed to pass between the first liquid chamber or the first liquid chamber by passing the liquid through the plurality of pores. The two liquid chambers can be separated from each other, and the bubbles can be prevented from joining and growing to easily maintain the bubbles in a finely dispersed state.

Also, since the positions of the openings at both ends of the pores are different from each other in the plan view of the barrier, for example, the length of the pores is ensured to be large compared to a configuration in which the positions of the openings at both ends are the same. When the liquid flows through the pores, a pressure loss can be generated.
Further, in at least two of the plurality of pores, the direction extending from the main body flow channel side to the first liquid chamber side or the second liquid chamber side at the end portion on the first liquid chamber side or the second liquid chamber side is extended. Since they are different from each other, even if bubbles are generated when the liquid flows into the first liquid chamber or the second liquid chamber from each pore, or when the liquid flows through the main body flow path, they are generated. The direction in which each bubble flows in the first liquid chamber or the second liquid chamber can be made different from each other, and the bubbles are finely dispersed by suppressing the bubbles from joining and growing in the first liquid chamber or the second liquid chamber. It can be made easy to maintain in the made state.
As described above, the generation of bubbles itself can be suppressed, and even if bubbles are generated, the bubbles can be easily maintained in a finely dispersed state. However, it is possible to suppress the generated abnormal noise.

Further, in a longitudinal sectional view along the central axis of the pore, the end of the pore on the main body channel side extends from the main body channel side toward the first liquid chamber side or the second liquid chamber side. The direction may form an acute angle with the direction from one of the first communication portion and the second communication portion toward the one side in the flow direction of the main body flow channel.
In this case, when the liquid flows into the pores from the main body flow path, the direction of the liquid flow can be greatly changed, and a large pressure loss can be generated. Thereby, the flow velocity of the liquid flowing into the first liquid chamber or the second liquid chamber can be effectively suppressed.

Further, in a longitudinal sectional view along the central axis of the pore, the end of the pore on the main body channel side extends from the main body channel side toward the first liquid chamber side or the second liquid chamber side. The direction is different from the direction extending from the main body channel side toward the first liquid chamber side or the second liquid chamber side at the end of the pore on the first liquid chamber side or the second liquid chamber side. May be.
In this case, since the direction in which the liquid flows into the pores from the main body flow path and the direction in which the liquid flows into the first liquid chamber or the second liquid chamber from each other are different from each other, When flowing, it becomes possible to cause a pressure loss, and the flow rate of the liquid flowing from the pores into the first liquid chamber or the second liquid chamber can be more effectively suppressed.

  According to the present invention, it is possible to suppress the generation of abnormal noise caused by 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 1st Embodiment of this invention. It is a top view of the partition member of the vibration isolator shown in FIG. FIG. 3 is a partially enlarged view of the partition member shown in FIG. 2. It is the longitudinal cross-sectional view seen from the radial direction outer side of the pore shown in FIG. It is the longitudinal cross-sectional view seen from the radial direction outer side in the pore which concerns on 2nd Embodiment of this invention.

(First embodiment)
Embodiments of a vibration isolator according to the present invention will be described below with reference to the drawings.
As shown in FIG. 1, the vibration isolator 10 includes a cylindrical first attachment member 11 connected to one of the vibration generating unit and the vibration receiving unit, and one of the vibration generating unit and the vibration receiving unit. The second mounting member 12 to be connected, the elastic body 13 that elastically connects the first mounting member 11 and the second mounting member 12 to each other, and the main liquid chamber (first liquid chamber) to be described later in the first mounting member 11 ) 14 and a partition member 16 that divides into a secondary liquid chamber (second liquid chamber) 15.

Hereinafter, the direction along the central axis O1 of the first mounting member 11 is referred to as the axial direction. 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 viewed from the axial direction, a direction orthogonal to the central axis O1 is referred to as a radial direction, and a direction around the central axis O1 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 a plan view, and are arranged coaxially with the central axis O1.

  When the vibration isolator 10 is mounted on, for example, 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. This suppresses transmission of engine vibration 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 whose lower end bulges downward, and a flange 12a above the lower end of the hemispherical shape. have. A screw hole 12b extending downward from the upper end surface of the second mounting member 12 is formed, and a bolt (not shown) serving as an engine-side mounting tool is screwed into the screw hole 12b. The second mounting member 12 is disposed in the upper end opening of the first mounting member 11 via the elastic body 13.

  The elastic body 13 is a rubber body that is vulcanized and bonded to the upper end opening of the first mounting member 11 and the outer peripheral surface of the lower portion of the second mounting member 12, respectively, and interposed between them. The upper end opening of the mounting member 11 is closed from above. The elastic body 13 is sufficiently in close contact with the second mounting member 12 by the upper end of the elastic body 13 coming into contact with the flange portion 12a of the second mounting member 12, and follows better due to the displacement of the second mounting member 12. ing. A rubber film 17 is integrally formed on the lower end portion of the elastic body 13 to liquid-tightly cover the inner peripheral surface of the first mounting member 11 and the inner peripheral portion of the lower end opening edge. As the elastic body 13, an elastic body made of synthetic resin or the like can be used in addition to rubber.

  The first attachment member 11 is formed in a cylindrical shape having a flange 18 at a lower end portion, and is connected to a vehicle body or the like as a vibration receiving portion via the flange 18. A portion of the inside of the first attachment member 11 located below the elastic body 13 is a liquid chamber 19. In the present embodiment, a partition member 16 is provided at the lower end portion of the first attachment member 11, and a 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 soft resin, and has a bottomed cylindrical shape. The upper end portion of the diaphragm 20 is sandwiched between the lower surface of the outer peripheral portion 22 of the partition member 16 and the ring-shaped holder 21 positioned below the partition member 16 in the axial direction. The lower end portion of the rubber film 17 is in liquid-tight contact with the upper surface of the outer peripheral portion 22 of the partition member 16.

  Under such a configuration, the outer peripheral portion 22 of the partition member 16 and the holder 21 are arranged in this order on the lower end opening edge of the first mounting member 11 in this order downward, and are fixed integrally with 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 portion of the diaphragm 20 has a shape that is deep on the outer peripheral side and shallow at the center. However, as the shape of the diaphragm 20, various conventionally known shapes can be adopted in addition to such a shape.

  As described above, the liquid chamber 19 is formed in the first mounting member 11 by attaching the diaphragm 20 to the first mounting member 11 via the partition member 16 in this manner. The liquid chamber 19 is disposed in the first mounting member 11, that is, inside the first mounting member 11 in plan view, and is a sealed space that is liquid-tightly sealed by the elastic body 13 and the diaphragm 20. . The liquid chamber 19 is filled (filled) with the liquid L.

  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 using the lower surface 13a of the elastic body 13 as a part of the wall surface. The rubber film 17 and the partition member 16 that cover the elastic body 13 and the inner peripheral surface of the first mounting member 11 in a liquid-tight manner. And the inner 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 that is mounted and used so that the main liquid chamber 14 is positioned on the upper side in the vertical direction and the auxiliary liquid chamber 15 is positioned on the lower side in the vertical direction. .

Of the lower surface of the partition member 16 facing the sub liquid chamber 15 side, a first holding groove 16a that is recessed upward is formed in a portion adjacent to the outer peripheral portion 22 and the inside in the radial direction. The upper end portion of the diaphragm 20 is in close contact with the first holding groove 16a, so that the diaphragm 20 and the partition member 16 are closed.
Further, a second holding groove 16b that is recessed downward is formed in a portion of the upper surface of the partition member 16 that faces the main liquid chamber 14 side that is adjacent to the outer peripheral portion 22 in the radial direction. Since the lower end portion of the rubber film 17 is in close contact with the second holding groove 16b, the space between the rubber film 17 and the partition member 16 is closed.

  The partition member 16 is formed with a restriction passage 24 that allows the main liquid chamber 14 and the sub liquid chamber 15 to communicate with each other. As shown in FIGS. 1 and 2, the restriction passage 24 includes a first communication portion 26 that opens to the main liquid chamber 14, a second communication portion 27 that opens to the auxiliary liquid chamber 15, and the first communication portion 26 and the second communication passage 26. A main body flow path 25 communicating with the communication portion 27 is provided.

  The main body flow path 25 extends along the circumferential direction in the partition member 16, 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 arranged coaxially with the central axis O1 and extends over a range in which the central angle around the central axis O1 exceeds 180 ° along the circumferential direction. 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 in the partition member 16.

Both the first barrier 28 and the second barrier 29 are formed in a plate shape whose front and back surfaces face the axial direction. The first barrier 28 is sandwiched between the main body flow path 25 and the main liquid chamber 14 in the axial direction, and is positioned between the main body flow path 25 and the main liquid chamber 14. The second barrier 29 is sandwiched between the main body flow path 25 and the auxiliary liquid chamber 15 in the axial direction, and is positioned between the main body flow path 25 and the auxiliary liquid chamber 15.
The second communication portion 27 includes one opening 32 that penetrates the second barrier 29 in the axial direction. The opening 32 is disposed in a portion of the second barrier 29 that forms one end along the circumferential direction of the main body flow path 25.

In the present embodiment, 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 plurality of pores 31 are disposed in a portion of the first barrier 28 that forms the other end along the circumferential direction of the main body flow path 25. At least some of the plurality of pores 31 form a row of holes arranged at intervals in the circumferential direction on concentric circles centered on the central axis O1.
In the following, along the circumferential direction, the one end side of the main body channel 25 is referred to as one side, and the other end side is referred to as the other side. A direction along the center axis O2 (see FIG. 4) of the pore 31 is referred to as a hole axis direction. In the plan view, a direction orthogonal to the center axis O2 is a hole diameter direction, and a direction around the center axis O2 is a hole. It is called the circumferential direction.

Each of the plurality of pores 31 is smaller than the channel cross-sectional area of the main body channel 25 and is disposed inside each of the first barrier 28 and the main body channel 25 in plan view. In the illustrated example, the lengths of the plurality of pores 31 are equal to each other. The inner diameters of the plurality of pores 31 are equal to each other. The lengths and the inner diameters of the plurality of pores 31 may be different from each other.
A plurality of the pores 31 are formed in the first barrier 28 at intervals in the radial direction. That is, a plurality of the hole arrays are arranged in the first barrier 28 with a space in the radial direction. In the example shown in the figure, two pores 31 are formed in the first barrier 28 with a gap in the radial direction. The pores 31 adjacent to each other in the radial direction are arranged with their circumferential positions shifted from each other. Note that the plurality of pores 31 may be disposed in the first barrier 28 at radial positions at equal positions along the circumferential direction.

The cross-sectional area of the pore 31 may be, for example, 25 mm ² or less, preferably 2 mm ² or more and 8 mm ² or less.
In addition, the total cross-sectional area of each of the plurality of fine pores 31 for all the plurality of fine pores 31 is the flow passage cross-sectional area of the entire first communication portion 26, for example, 1 which is the minimum value of the flow passage cross-sectional area in the main body flow passage 25. It is good also as 8 times or more and 4.0 times or less.

  Moreover, in this embodiment, as shown in FIG. 3 and FIG. Of the pores 31, the first opening 31A on the main liquid chamber 14 side is located on one side in the circumferential direction with respect to the second opening 31B on the main body flow path 25 side. In the illustrated example, the center axis O2 gradually extends straight toward one side in the circumferential direction from the main body flow path 25 side toward the main liquid chamber 14 side. The inclination angle and the inclination direction with respect to the axial direction of the central axis O2 are the same in all the pores 31. The inner diameter of the pore 31 is the same over the entire region in the hole axis direction.

  In the present embodiment, in at least two of the plurality of pores 31, the directions extending from the main body flow channel 25 side toward the main liquid chamber 14 side in the end portion 33A on the main liquid chamber 14 side are different from each other. . In the illustrated example, the directions extending from the main body flow path 25 side toward the main liquid chamber 14 side in the end portions 33A on the main liquid chamber 14 side in all the pores 31 are different from each other. In all the pores 31, the direction extending from the main body flow path 25 side toward the main liquid chamber 14 side in the end portion 33A on the main liquid chamber 14 side coincides with the circumferential direction in the plan view. It should be noted that the present invention is not limited to such an embodiment, and in some of the plurality of pores 31, the directions extending from the main body flow channel 25 side to the main liquid chamber 14 side in the end portion 33A on the main liquid chamber 14 side are mutually The directions may extend from the main body flow path 25 side toward the sub liquid chamber 15 side at the end portion 33B on the sub liquid chamber 15 side.

  Further, in the present embodiment, in the longitudinal cross-sectional view along the hole axis direction, the direction extending from the main body flow channel 25 side toward the main liquid chamber 14 side in the end portion 33B on the main body flow channel 25 side of the pore 31 is In the flow path direction, an acute angle is formed with the direction from the second communication portion 27 toward the first communication portion 26. In the illustrated example, the direction extending from the main body flow path 25 side toward the main liquid chamber 14 side at the end 33B of the pore 31 on the main body flow path 25 side is the first of the flow path directions in the plan view. It faces the opposite direction from the second communication portion 27 toward the first communication portion 26. In addition, the direction extending from the main body flow channel 25 side toward the main liquid chamber 14 side in the end portion 33B on the main body flow channel 25 side of the pore 31 is not limited to such an aspect, but in the plan view, Of the directions, the direction may be inclined with respect to the direction from the second communication portion 27 toward the first communication portion 26 or may be orthogonal.

  In the vibration isolator 10 having such a configuration, both attachment 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 restriction passage 24, and the liquid L in the sub liquid chamber 15 flows into the restriction passage 24. Through the main liquid chamber 14.

  And according to the vibration isolator 10 which concerns on this embodiment, when the liquid L flows in into the main liquid chamber 14 from the main body flow path 25 through the some pore 31, the 1st in which these pores 31 were formed. Since each pore 31 is circulated while being subjected to pressure loss by the barrier 28, the flow velocity of the liquid L flowing into the main liquid chamber 14 can be suppressed.

In addition, since the liquid L circulates through the plurality of pores 31 instead of the single pore 31, the liquid L can be branched and circulated, and the liquid L that has passed through the individual pores 31 can be circulated. The flow rate of can be reduced. Thereby, even if a large load (vibration) is input to the vibration isolator 10, the liquid L that has flowed into the main liquid chamber 14 through the pores 31 and the liquid L in the main liquid chamber 14 It is possible to suppress the flow velocity difference 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.
Even if bubbles are generated in the main body flow path 25 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. It is possible to prevent the bubbles from joining and growing, and to easily maintain the bubbles in a finely dispersed state.

Further, since the positions of both end openings 31A and 31B in the pore 31 are different from each other in a plan view of the first barrier 28, compared with a configuration in which the positions of both end openings 31A and 31B are the same. For example, it is possible to ensure a large length of the pores 31 and the like, and when the liquid flows through the pores 31, pressure loss can be caused. In addition, in at least two of the plurality of pores 31, the directions extending from the main body flow channel 25 side toward the main liquid chamber 14 side in the end portion 33A on the main liquid chamber 14 side are different from each other. Even if bubbles are generated when the liquid L flows into the main liquid chamber 14 from the holes 31 or when the liquid flows through the main body flow path 25, each of the generated bubbles is generated in the main liquid chamber 14 or the sub liquid chamber 14. The flow directions in the liquid chamber 15 can be made different from each other, and the bubbles are prevented from joining and growing in the main liquid chamber 14 or the sub liquid chamber 15 to maintain the bubbles in a finely dispersed state. It can be made easier.
As described above, the generation of bubbles itself can be suppressed, and even if bubbles are generated, the bubbles can be easily maintained in a finely dispersed state. However, it is possible to suppress the generated abnormal noise.

  Further, in the longitudinal sectional view, the direction extending from the main body flow path 25 side toward the main liquid chamber 14 side at the end 33B of the pore 31 on the main body flow path 25 side is the second communication direction in the flow path direction. Since the direction from the portion 27 toward the first communication portion 26 is an acute angle, the flow direction of the liquid L can be greatly changed when the liquid L flows into the pores 31 from the main body flow path 25. Thus, a large pressure loss can be generated. Thereby, the flow velocity of the liquid flowing into the main liquid chamber 14 can be effectively suppressed.

(Second Embodiment)
Next, the vibration isolator according to the second embodiment of the present invention will be described. In addition, the same code | symbol is attached | subjected to the structure similar to 1st Embodiment, the description is abbreviate | omitted, and only a different point is demonstrated. The description of the same operation is also omitted.

As shown in FIG. 5, in the vibration isolator according to the present embodiment, in the longitudinal sectional view, at the end 33 </ b> B of the pore 35 on the main body flow path 25 side, from the main body flow path 25 side toward the main liquid chamber 14. The direction extending in a direction different from the direction extending from the main body flow path 25 side toward the main liquid chamber 14 side at the end portion 33A of the pore 35 on the main liquid chamber 14 side is different. In the example shown in the drawing, the portion located on the main body flow path 25 side of the pore 35 extends while being inclined with respect to the axial direction, and the portion located on the main liquid chamber 14 side extends straight along the axial direction. . Note that the present invention is not limited to such a mode. For example, a portion located on the main body flow path 25 side extends straight along the axial direction, and a portion located on the main liquid chamber 14 side extends inclined with respect to the axial direction. May be.
In the vibration isolator according to the present embodiment, the direction in which the liquid flows into the pores 35 from the main body flow path 25 is different from the direction in which the liquid flows into the main liquid chamber 14 from the pores 35. When the liquid L flows through the inside, a pressure loss can be generated, and the flow rate of the liquid L flowing into the main liquid chamber 14 from the pores 35 can be more effectively suppressed.

The technical scope of the present invention is not limited to the above embodiment, and various modifications can be made without departing from the spirit of the present invention.
For example, in the first embodiment, the configuration in which all the pores 31 extend in the circumferential direction in the plan view from the main body flow path 25 toward the main liquid chamber 14 is shown. Not limited. The directions extending from the main body flow path 25 toward the main liquid chamber 14 in all the pores 31 may be irregularly different from each other.

In the first embodiment, the pores 31 are formed in the first barrier 28. However, the pores 31 may be formed in the second barrier 29, or may be formed in both the first barrier 28 and the second barrier 29. Also good.
In the above embodiment, the pores 31 are formed in a cylindrical shape (straight circular hole shape), but may be formed in a truncated cone shape that gradually decreases in diameter.

Moreover, in the said 1st Embodiment, although the several pore 31 was formed in the cross-sectional view circular shape, this invention is not limited to this. For example, the plurality of pores 31 may be appropriately changed, for example, formed in a cross-sectional viewing angle shape.
In the first embodiment, the first communication portion 26 includes the plurality of pores 31. For example, a configuration having both an opening having a larger diameter than the pore 31 and the pore 31 is employed. Also good. Moreover, the 2nd communication part 27 may be provided with the some opening part 32 arrange | positioned along the circumferential direction (flow path direction of the main body flow path 25).

  Moreover, in the said 1st Embodiment, although the partition member 16 is arrange | positioned in the lower end part of the 1st attachment member 11, and the outer peripheral part 22 of the partition member 16 is made to contact | abut to the lower end opening edge of the 1st attachment member 11, For example, the partition member 16 is arranged sufficiently above the lower end opening edge of the first mounting 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 mounting member 11. The auxiliary liquid chamber 15 may be formed from the lower end portion of the attachment member 11 to the bottom surface of the diaphragm 20.

Moreover, although the said 1st Embodiment demonstrated the compression type vibration isolator 10 in which a positive pressure acts on the main liquid chamber 14 when a support load acts, the main liquid chamber 14 is located in the vertical direction lower side. In addition, the auxiliary liquid chamber 15 is attached so as to be positioned on the upper side in the vertical direction, and can be applied to a suspension type vibration isolator in which a negative pressure is applied to the main liquid chamber 14 when a support load is applied.
In the first embodiment, the partition member 16 partitions the liquid chamber 19 in the first mounting member 11 into the main liquid chamber 14 and the sub liquid chamber 15 having the elastic body 13 as part of the wall surface. However, it is not limited to this. For example, instead of providing the diaphragm 20, the elastic body 13 may be provided, and instead of providing the secondary liquid chamber 15, a pressure receiving liquid chamber having the elastic body 13 at 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 enclosed into the main liquid chamber 14 and the sub liquid chamber 15, and at least one of the main liquid chamber 14 and the sub liquid chamber 15. One can be appropriately changed to another configuration having the elastic body 13 in a part of the wall surface.
The vibration isolator 10 according to the present invention is not limited to an engine mount of a vehicle, and can be applied to other than the engine mount. For example, the present 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, the constituent elements in the above-described embodiment can be appropriately replaced with known constituent elements without departing from the gist of the present invention, and the above-described embodiments and modifications may be appropriately combined.

DESCRIPTION OF SYMBOLS 10 Vibration isolator 11 1st attachment member 12 2nd attachment 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 Restriction passage 25 Main body flow path 26 First communication portion 27 Second communication portion 28 First barrier 29 Second barrier 31, 35 Fine pore 31A First opening portion 31B Second opening portion 33A, 33B End Part

Claims (3)

A cylindrical first mounting member coupled to one of the vibration generating unit and the vibration receiving unit, and a second mounting member coupled to the other;
An elastic body that elastically connects both the mounting members;
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, and
A liquid-sealed vibration isolator 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 that opens to the first liquid chamber, a second communication portion that opens to the second liquid chamber, and a main body channel that communicates the first communication portion and the second communication portion. With
At least one of the first communication part and the second communication part includes a plurality of pores penetrating the barrier facing the first liquid chamber or the second liquid chamber,
In the plan view of the barrier, the positions of the openings at both ends of the pore are different from each other,
In at least two of the plurality of pores, from the main body channel side to the first liquid chamber side or the second liquid chamber side at the end of the first liquid chamber side or the second liquid chamber side. An anti-vibration device having different directions extending toward each other.   In a longitudinal sectional view along the central axis of the pore, the direction extending from the main body flow channel side toward the first liquid chamber side or the second liquid chamber side at the end of the fine pore on the main body flow channel side is 2. An acute angle is formed with a direction from one of the first communication portion and the second communication portion toward one side of the flow direction of the main body flow passage. The vibration isolator described in 1.   In a longitudinal sectional view along the central axis of the pore, the direction extending from the main body flow channel side toward the first liquid chamber side or the second liquid chamber side at the end of the fine pore on the main body flow channel side is The direction of the end of the pore on the first liquid chamber side or the second liquid chamber side is different from the direction extending from the main body channel side toward the first liquid chamber side or the second liquid chamber side. The vibration isolator according to claim 1 or 2.

Images