JP2018185024A - Vibration controller - Google Patents

Abstract

PROBLEM TO BE SOLVED: To exhibit attenuation performance without inhibiting excellent ride comfort.SOLUTION: A partition member 16 comprises a storage chamber 23 storing a membrane 22, and a first communication hole 16a opened to a front face 22a of the membrane and communicating between the storage chamber and a first liquid chamber 14. In the storage chamber, a portion positioned on a rear face 22b of the membrane has the rear face of the membrane at a part of a wall surface, is an air chamber 25 separate from the liquid chamber 17, and includes air pressure adjustment means 26 capable of adjusting inner pressure of the air chamber. An air flow passage 27 is formed in an outside attachment member or inside attachment member so as to communicate between the air pressure adjustment means and the air chamber.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, for example, a vibration isolator described in Patent Document 1 below is known. The vibration isolator connects the cylindrical outer mounting member, the inner mounting member disposed inside the outer mounting member, the outer mounting member and the inner mounting member, and an axis along the central axis of the outer mounting member. A pair of body rubbers, an outer mounting member, and an inner mounting member that are spaced apart in the direction are connected to each other, and a liquid chamber between the pair of body rubbers is connected to the first liquid chamber and the second liquid in the axial direction. And a partition member that partitions the chamber. The partition member includes an annular rigid body portion in which a restriction passage that communicates the first liquid chamber and the second liquid chamber is formed, and an annular elastic portion that is continuous with the rigid body portion in a radial direction intersecting the central axis. I have.
In this vibration isolator, when the vibration is input, the liquid moves between the first liquid chamber and the second liquid chamber through the restriction passage, so that the input vibration is attenuated and absorbed.

JP 2011-196453 A

  However, in the conventional vibration isolator, it is difficult to adjust the dynamic spring according to the driving state of the vibration generating unit, and it is difficult to achieve both improvement in riding comfort and high damping performance. There was a problem that there was.

  The present invention has been made in view of the above-described circumstances, and an object of the present invention is to exhibit high damping performance without hindering good riding comfort.

In order to solve the above problems, the present invention proposes the following means.
A vibration isolator according to the present invention is a cylindrical outer mounting member connected to one of a vibration generating unit and a vibration receiving unit, and is connected to the other and disposed inside the outer mounting member. A pair of body rubbers that connect the inner mounting member, the outer mounting member, and the inner mounting member, and that are spaced apart in the axial direction along the central axis of the outer mounting member, and the pair of body rubbers A partition member that partitions the liquid chamber between the first liquid chamber and the second liquid chamber in the axial direction, and the first liquid chamber is provided in the outer mounting member, the inner mounting member, or the partition member. And an anti-vibration device in which a restriction passage is formed for communication between the second liquid chamber and the second liquid chamber, wherein the partition member is open toward the surface of the membrane, the accommodating chamber accommodating the membrane, A first fluid communication between the one liquid chamber and the storage chamber A through hole is formed, and the portion located on the back side of the membrane in the housing chamber is an air chamber that has the back side of the membrane in a part of the wall surface and is isolated from the liquid chamber, An air pressure adjusting means capable of adjusting an internal pressure of the air chamber is provided, and an air flow path that connects the air pressure adjusting means and the air chamber is formed in the outer mounting member or the inner mounting member. And

According to the present invention, when vibration is input, the pair of main body rubbers are elastically deformed, and the hydraulic pressures in the first liquid chamber and the second liquid chamber tend to change. At this time, the liquid moves between the first liquid chamber and the second liquid chamber through the restriction passage, and the vibration is attenuated and absorbed. And both the 1st liquid chamber and the 2nd liquid chamber which a restriction | limiting channel | path communicates have a main body rubber in a part of partition, and become a pressure receiving liquid chamber from which a hydraulic pressure fluctuates with the input of a vibration. Therefore, the fluctuation amount of the hydraulic pressure at the time of vibration input becomes large, and high damping performance can be exhibited.
Furthermore, when the membrane is elastically deformed to such an extent that it is difficult to deform any more by driving the air pressure adjusting means and adjusting the internal pressure of the air chamber, the deformation of the membrane is restricted at the time of vibration input. The hydraulic pressure generated in each of the first liquid chamber and the second liquid chamber is particularly increased, and the generated damping force can be further increased.
On the other hand, when the air chamber is at atmospheric pressure, when the vibration is input, the liquid moves between the first liquid chamber and the storage chamber through the first communication hole, so that the membrane is elastic in the storage chamber. Deform. Therefore, it is possible to absorb the hydraulic pressure fluctuations generated in the first liquid chamber and the second liquid chamber when the vibration is input, along with the elastic deformation of the membrane. Can be improved.
From the above, it is possible to adjust the dynamic spring by changing the internal pressure of the air chamber by the air pressure adjusting means according to the driving status of the vibration generating part, and high damping without hindering good riding comfort Performance can be demonstrated.

  Here, two of the membranes are disposed in the storage chamber with an interval in the axial direction, and a second communication hole that connects the second liquid chamber and the storage chamber is formed in the partition member. The air chamber may be a space between the two membranes, and a restraining member capable of suppressing deformation of the membrane may be disposed in the air chamber.

In this case, since the restraining member is disposed in the air chamber located between the two membranes, the two membranes are brought into contact with the restraining member when the air pressure adjusting means is driven to make the air chamber have a negative pressure. By doing so, further deformation of each membrane can be reliably suppressed.
In addition, the first liquid chamber and the storage chamber communicate with the partition member, and the first communication hole that opens toward the surface of one of the two membranes, the second liquid chamber, and the storage chamber are provided. Since the second communication hole that is open to the surface of the other membrane of the two membranes is formed, when the air chamber is at atmospheric pressure, when vibration is input, It is possible not only to allow liquid to travel between the first liquid chamber and the storage chamber through the first communication hole, but also to allow liquid to travel between the second liquid chamber and the storage chamber through the second communication hole, and vibration Both of the two membranes can be elastically deformed smoothly at the time of inputting, and the increase in the spring at the time of inputting vibration can be surely suppressed.

  Further, the restriction passage is formed in one of the outer mounting member and the inner mounting member or the partition member, and the air flow path is any of the outer mounting member and the inner mounting member. Alternatively, it may be formed on the other side.

  In this case, since the restriction passage and the air flow path are formed as separate members, the restriction passage and the air flow path can be easily formed with less restrictions such as dimensions.

  The partition member may be an elastic part connected to one of the outer mounting member and the inner mounting member, and the other of the outer mounting member and the inner mounting member having the air flow path. A rigid body portion connected to the housing body, and the housing portion and the first communication hole may be formed in the rigid body portion.

In this case, since the partition member includes the elastic portion, it is possible to smoothly displace the outer mounting member and the inner mounting member smoothly by elastically deforming the elastic portion when the vibration is input. The anti-vibration property can be exhibited stably.
Further, since the rigid portion having the air chamber is connected to the other of the outer mounting member and the inner mounting member having the air flow path, the air chamber and the air flow path can be easily and reliably communicated with each other. .

  According to the present invention, high damping performance can be exhibited without hindering good riding comfort.

It is a longitudinal cross-sectional view of the vibration isolator which concerns on one Embodiment of this invention. It is a longitudinal cross-sectional view which shows the state which driven the air pressure adjustment means in the vibration isolator shown in FIG.

Hereinafter, a vibration isolator 10 according to an embodiment of the present invention will be described with reference to the drawings.
As shown in FIGS. 1 and 2, the vibration isolator 10 includes a cylindrical outer mounting member 11 connected to one of the vibration generating unit and the vibration receiving unit, and an outer mounting connected to the other. A pair of inner mounting members 12 disposed on the inner side of the member 11, the outer mounting members 11 and the inner mounting members 12 are connected to each other, and are spaced apart in the axial direction along the central axis O of the outer mounting member 11. And a partition member 16 that partitions the liquid chamber 17 between the pair of main body rubbers 13 into a first liquid chamber 14 and a second liquid chamber 15 in the axial direction. The liquid chamber 17 is filled with, for example, ethylene glycol, water, silicone oil, or the like.

Hereinafter, the center side of the outer mounting member 11 along the axial direction is referred to as the axial inner side, and the opening end side of the outer mounting member 11 along the axial direction is referred to as the axial outer side. Further, in a plan view viewed from the axial direction, a direction orthogonal to the central axis O is referred to as a radial direction, and a direction along the central axis O is referred to as a circumferential direction.
The vibration isolator 10 is applied to, for example, a cabin mount and is used in a state where the axial direction is directed in the vertical direction.

The intermediate cylinder members 18 are individually fitted in both end portions of the outer mounting member 11 on the outer side in the axial direction. A support flange portion 18 a that protrudes outward in the radial direction is formed at an end portion on the axially outer side of the intermediate cylindrical member 18. The support flange portion 18a extends continuously over the entire circumference. The support flange portion 18 a is disposed at the opening end edge on the outer side in the axial direction of the outer mounting member 11.
The inner attachment member 12 is disposed on the radially inner side of the outer attachment member 11. The inner mounting member 12 has a cylindrical shape and is arranged coaxially with the central axis O. The positions of the central portions in the axial direction of the outer mounting member 11 and the inner mounting member 12 are equal to each other. Both end portions on the outer side in the axial direction of the inner mounting member 12 protrude from the outer mounting member 11 outward in the axial direction.

  The pair of main body rubbers 13 connect the outer mounting member 11 and the inner mounting member 12 and are arranged at an interval in the axial direction. The main rubber 13 is connected to the outer mounting member 11 via the intermediate cylinder member 18. The main rubber 13 has an annular shape. Each of the pair of main rubbers 13 gradually extends downward as it goes from the inner side to the outer side in the radial direction. A radially outer end of the main rubber 13 is vulcanized and bonded to the inner peripheral surface of the intermediate cylinder member 18. A radially inner end of the main rubber 13 is vulcanized and bonded to the outer peripheral surface of the inner mounting member 12.

The partition member 16 has an annular shape and is disposed in the central portion of the liquid chamber 17 in the axial direction. The volumes of the first liquid chamber 14 and the second liquid chamber 15 are equal to each other. Instead of this configuration, for example, the volumes of the first liquid chamber 14 and the second liquid chamber 15 may be different from each other.
In the present embodiment, the partition member 16 has a storage chamber 23 in which the membrane 22 is stored, and a first communication hole that opens toward the surface 22 a of the membrane 22 and communicates the first liquid chamber 14 and the storage chamber 23. 16a are formed.

  The storage chamber 23 is an annular space disposed coaxially with the central axis O. The storage chamber 23 has an inner surface facing the outer side in the radial direction, an outer surface facing the inner side in the radial direction and facing the inner surface in the radial direction, a downward direction, and upper ends of the inner side surface and the outer surface. The upper surface to be connected is defined by the lower surface that faces upward and connects the lower ends of the inner surface and the outer surface. The first communication hole 16 a opens on the upper surface of the accommodation chamber 23. In the storage chamber 23, the portion located on the back surface 22 b side of the membrane 22 is an air chamber 25 having the back surface 22 b of the membrane 22 as a part of the wall surface and isolated from the liquid chamber 17.

Two membranes 22 are disposed in the accommodating chamber 23 with an interval in the axial direction. The membrane 22 is formed in an annular shape and is disposed coaxially with the central axis O. Of the membrane 22, the outer peripheral edge and the inner peripheral edge are separately connected to the outer surface and the inner surface of the storage chamber 23, and the portion located between the outer peripheral edge and the inner peripheral edge is not in contact with other members. It has become. The membrane 22 is formed to be elastically deformable.
The air chamber 25 is a space between the two membranes 22. That is, the air chamber 25 is defined by the back surfaces 22 b of the pair of membranes 22 and the inner and outer surfaces of the storage chamber 23.

A second communication hole 16 b that allows the second liquid chamber 15 and the storage chamber 23 to communicate with each other is formed in the partition member 16. The second communication hole 16b opens to the lower surface of the storage chamber 23 and opens toward the lower surface 22a of the pair of membranes 22 positioned on the lower side in the vertical direction.
In the air chamber 25, a restraining member 24 capable of restraining deformation of the membrane 22 is disposed. The restraining member 24 is formed in a plate shape whose front and back surfaces are opposed to the respective back surfaces 22b of the pair of membranes 22 with a gap provided in the axial direction. The restraining member 24 is formed in an annular shape and is disposed coaxially with the central axis O. Out of the restraining member 24, the outer peripheral edge and the inner peripheral edge are separately connected to the outer and inner side surfaces of the storage chamber 23, and the portion positioned between the outer peripheral edge and the inner peripheral edge is not different from other members. In contact. The suppression member 24 is formed with a through hole 24a penetrating in the axial direction.

Further, in the present embodiment, an air pressure adjusting means 26 that can adjust the internal pressure of the air chamber 25 is provided, and an air flow path 27 that communicates the air pressure adjusting means 26 and the air chamber 25 with the outer mounting member 11 or the inner mounting member 12. Is formed. An example of the air pressure adjusting means 26 is a pump.
Here, a restriction passage 21 that communicates the first liquid chamber 14 and the second liquid chamber 15 is formed in one of the outer mounting member 11 and the inner mounting member 12, or the partition member 16, and the air flow path. 27 is formed on the other of the outer mounting member 11 and the inner mounting member 12.
And the partition member 16 is the other which has the air flow path 27 among the elastic part 19 connected with any one of the outer side attachment member 11 and the inner side attachment member 12, and the outer side attachment member 11 and the inner side attachment member 12. And a rigid body portion 20, in which the storage chamber 23, the first communication hole 16 a, and the second communication hole 16 b are formed.

In the illustrated example, the restriction passage 21 is formed in the outer mounting member 11, and the elastic portion 19 is connected to the outer mounting member 11. The air flow path 27 is formed in the inner mounting member 12, and the rigid body portion 20 is connected to the inner mounting member 12.
Instead of this configuration, for example, the restriction passage 21 may be formed in the inner mounting member 12 or the partition member 16, and the air flow path 27 may be formed in the outer mounting member 11. Further, the rigid body portion 20 is connected to one of the outer mounting member 11 and the inner mounting member 12 that does not have the air flow path 27, and the elastic portion 19 is connected to the air flow of the outer mounting member 11 and the inner mounting member 12. You may connect with the other which has the path 27. Further, both the restriction passage 21 and the air passage 27 may be formed in either one of the outer attachment member 11 and the inner attachment member 12.

The elastic part 19 and the rigid part 20 are each formed in an annular shape arranged coaxially with the central axis O. The radially outer end portion of the elastic portion 19 is vulcanized and bonded to the inner peripheral surface of the outer mounting member 11, and the inner peripheral surface of the rigid body portion 20 is fixed to the outer peripheral surface of the inner mounting member 12. The radially inner end of the elastic part 19 is vulcanized and bonded to the outer peripheral surface of the rigid part 20.
The restriction passage 21 extends along the circumferential direction, and both ends in the circumferential direction respectively define a part of the inner circumferential surface of the outer mounting member 11 that defines a part of the inner surface of the first liquid chamber 14, and the second Openings are made separately in portions that define a part of the inner surface of the liquid chamber 15. The air flow path 27 extends in the axial direction and opens in a portion of the inner side surface of the accommodation chamber 23 that defines a part of the inner surface of the air chamber 25.

  In the vibration isolator 10 configured as described above, when vibration is input, the pair of main body rubber 13 and the elastic portion 19 are elastically deformed, and the respective liquid pressures in the first liquid chamber 14 and the second liquid chamber 15 are respectively determined. Try to fluctuate. At this time, the liquid moves between the first liquid chamber 14 and the second liquid chamber 15 through the restriction passage 21, and the vibration is attenuated and absorbed.

As described above, according to the vibration isolator 10 according to the present embodiment, both the first liquid chamber 14 and the second liquid chamber 15 with which the restriction passage 21 communicates have the main body rubber 13 as a part of the partition wall. In addition, since the pressure receiving liquid chamber is such that the hydraulic pressure fluctuates with the input of vibration, the amount of fluctuation of the hydraulic pressure at the time of input of vibration increases, and high damping performance can be exhibited.
Furthermore, when the air pressure adjusting means 26 is driven to adjust the internal pressure of the air chamber 25 so that the membrane 22 is elastically deformed to such an extent that it is difficult to deform any more, the deformation of the membrane 22 is caused when vibration is input. The hydraulic pressure generated in each of the first liquid chamber 14 and the second liquid chamber 15 is particularly increased and the generated damping force can be further increased.
On the other hand, when the air chamber 25 is at atmospheric pressure, when the vibration is input, the liquid moves between the first liquid chamber 14 and the storage chamber 23 through the first communication hole 16a, so that the membrane 22 Is elastically deformed in the storage chamber 23. Accordingly, it is possible to absorb the fluid pressure fluctuation generated in each of the first fluid chamber 14 and the second fluid chamber 15 when the vibration is input, along with the elastic deformation of the membrane 22, and to suppress the increase in the spring. Comfort can be improved.
From the above, it is possible to adjust the dynamic spring by changing the internal pressure of the air chamber 25 by the air pressure adjusting means 26 according to the driving state of the vibration generating unit, and without impairing the good riding comfort. High damping performance can be exhibited.

Further, since the restraining member 24 is disposed in the air chamber 25 located between the two membranes 22, when the air pressure adjusting means 26 is driven to make the air chamber 25 have a negative pressure, the two membranes 22 are disposed. By abutting against the restraining member 24, further deformation of each membrane 22 can be reliably suppressed.
Further, the first liquid chamber 14 and the accommodation chamber 23 communicate with the partition member 16, and the first communication hole 16 a that opens toward the surface 22 a of one of the two membranes 22, and the second Since the liquid chamber 15 and the storage chamber 23 communicate with each other and the second communication hole 16b that opens toward the surface 22a of the other membrane 22 of the two membranes 22 is formed, the air chamber 25 is In the case of atmospheric pressure, when vibration is input, the liquid not only moves between the first liquid chamber 14 and the storage chamber 23 through the first communication hole 16a but also the second liquid chamber 15 and the storage chamber. 23 can be moved back and forth through the second communication hole 16b, and both of the two membranes 22 can be smoothly elastically deformed when a vibration is input. Surely It is possible.

  Further, the restriction passage 21 is formed in one of the outer attachment member 11 and the inner attachment member 12 or the partition member 16, and the air flow path 27 is any of the outer attachment member 11 and the inner attachment member 12. However, since the restriction passage 21 and the air flow path 27 are formed as separate members, the restriction passage 21 and the air flow path 27 can be easily formed with no restrictions on dimensions and the like.

In addition, since the partition member 16 includes the elastic portion 19, it is possible to smoothly displace the outer mounting member 11 and the inner mounting member 12 smoothly by elastically deforming the elastic portion 19 when vibration is input. Thus, the desired vibration isolation characteristics can be stably exhibited.
Further, since the rigid body portion 20 having the air chamber 25 is connected to the inner mounting member 12 having the air flow path 27, the air chamber 25 and the air flow path 27 can be communicated easily and reliably.

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 above-described embodiment, the pair of membranes 22 is disposed in the accommodation chamber 23, but only one may be disposed. In this configuration, the second communication hole 16 b is not formed in the partition member 16, the restraining member 24 is not provided in the storage chamber 23, and the back surface 22 b of the membrane 22 is attached to the storage chamber 23 when the air chamber 25 is under negative pressure. You may make it contact | abut to a lower surface. Further, the membrane 22 may be made more difficult to deform by setting the air chamber 25 to a positive pressure.
Further, the partition member 16 may have a configuration that does not include the elastic portion 19.

  The vibration isolator 10 is not limited to a cabin mount of a vehicle, and can be applied to other than the cabin mount. For example, it can be applied to engine mounts and bushes for vehicles, generator mounts mounted on construction machines, or to machine mounts installed in factories and the like. .

  In addition, it is possible to appropriately replace the constituent elements in the embodiment with known constituent elements without departing from the spirit of the present invention, and the above-described modified examples may be appropriately combined.

DESCRIPTION OF SYMBOLS 10 Vibration isolator 11 Outer attachment member 12 Inner attachment member 13 Main body rubber | gum 14 1st liquid chamber 15 2nd liquid chamber 16 Partition member 16a 1st communicating hole 16b 2nd communicating hole 17 Liquid chamber 19 Elastic part 20 Rigid body part 21 Restriction path DESCRIPTION OF SYMBOLS 22 Membrane 22a Membrane surface 22b Membrane back surface 23 Accommodating chamber 24 Inhibiting member 25 Air chamber 26 Air pressure adjusting means 27 Air flow path O Center axis

Claims (4)

A cylindrical outer mounting member coupled to either one of the vibration generating unit and the vibration receiving unit, and an inner mounting member coupled to the other and disposed inside the outer mounting member;
A pair of body rubbers that connect the outer mounting member and the inner mounting member, and are spaced apart in the axial direction along the central axis of the outer mounting member,
A partition member that partitions the liquid chamber between the pair of main body rubbers into a first liquid chamber and a second liquid chamber in the axial direction;
A vibration isolator in which a restriction passage communicating the first liquid chamber and the second liquid chamber is formed in the outer mounting member, the inner mounting member, or the partition member,
The partition member is formed with a storage chamber in which a membrane is stored, and a first communication hole that opens toward the surface of the membrane and communicates the first liquid chamber and the storage chamber.
In the storage chamber, the portion located on the back side of the membrane has the back side of the membrane as a part of the wall surface and is an air chamber isolated from the liquid chamber,
Air pressure adjusting means capable of adjusting the internal pressure of the air chamber;
An anti-vibration device characterized in that an air flow path communicating the air pressure adjusting means and the air chamber is formed in the outer mounting member or the inner mounting member. Two membranes are disposed in the storage chamber with an interval in the axial direction,
A second communication hole that connects the second liquid chamber and the storage chamber is formed in the partition member,
The air chamber is a space between the two membranes,
The vibration isolator according to claim 1, wherein a restraining member capable of restraining deformation of the membrane is disposed in the air chamber.   The restriction passage is formed in one of the outer mounting member and the inner mounting member, or the partition member, and the air flow path is one of the outer mounting member and the inner mounting member. The anti-vibration device according to claim 1 or 2, wherein the anti-vibration device is formed as described above. The partition member is connected to an elastic portion connected to one of the outer mounting member and the inner mounting member, and the other of the outer mounting member and the inner mounting member having the air flow path. A rigid body part,
The vibration isolator according to claim 3, wherein the storage chamber and the first communication hole are formed in the rigid body portion.

Images