JP2016114146A - Vibration control device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To surely attenuate and absorb vibration in a lateral direction, and to prevent integral cracking on a second elastic body, a division wall, and a first elastic body.SOLUTION: A vibration control device includes a first elastic body 13 elastically connecting first and second mounting members, a diaphragm 14 disposed separately from the first elastic body to one side in an axial direction of the first mounting member, and defining a liquid chamber 15 with the first elastic body, and a second elastic body 19 elastically connecting the first and second mounting members and disposed at the other side in the axial direction with respect to the first elastic body. A plurality of second pressure reception liquid chambers 21 are defined between the first elastic body and the second elastic body in a state of applying both elastic bodies as a part of a wall surface, the plurality of second pressure reception liquid chambers are defined by disposing a plurality of division walls 24 dividing an annular space between the frist elastic body and the second elastic body in the circumferential direction, and bulging portions 35 bulging toward the other side in the axial direction, are formed on connection parts with the division walls, of the second elastic body.SELECTED DRAWING: Figure 3

Description

  The present invention relates to a vibration isolator.

  Conventionally, a cylindrical first mounting member connected to the vibration receiving portion, a second mounting member connected to the vibration generating portion, and a first for elastically connecting the first and second mounting members to each other. An elastic body, a diaphragm disposed away from the first elastic body in one axial direction of the first mounting member, and defining a liquid chamber between the first elastic body, a liquid chamber, A partition member that divides a first pressure receiving liquid chamber having one elastic body as a part of a wall surface and a sub liquid chamber having a diaphragm as a part of a wall surface; and first and second attachment members; And a second elastic body disposed on the other side in the axial direction from the first elastic body, and between the first elastic body and the second elastic body, both elastic bodies are part of the wall surface. Two second pressure receiving liquid chambers are defined, and the first restriction passage that connects the first pressure receiving liquid chamber and the sub liquid chamber to the partition member, and two Two and a second limiting passage communicating the second pressure receiving liquid chamber and the auxiliary liquid chamber with each other, the vibration isolator is formed has been known.

JP 2006-125617 A

  However, in the conventional vibration isolator, the vibration in the transverse direction perpendicular to the axial direction is attenuated and absorbed, and the crack from the second elastic body to the first elastic body through the partition wall is generated. There was room for improvement in prevention.

  The present invention has been made in consideration of such circumstances, and reliably attenuates and absorbs vibrations in the lateral direction, and cracks from the second elastic body to the first elastic body through the partition wall occur. An object of the present invention is to provide a vibration isolator capable of preventing the occurrence.

  In order to solve the above-described problems and achieve such an object, the vibration isolator of the present invention includes a cylindrical first mounting member coupled to one of a vibration generating unit and a vibration receiving unit, A second attachment member connected to the other and disposed radially inside the first attachment member, a first elastic body elastically connecting the first and second attachment members, and the first A diaphragm that is disposed away from one elastic body on one side in the axial direction of the first mounting member, and that defines a liquid chamber between the first elastic body and the liquid chamber, A partition member that divides a first pressure receiving liquid chamber having an elastic body as a part of a wall surface into a sub liquid chamber having the diaphragm as a part of a wall surface, and the first and second mounting members are elastically connected to each other. And a second elastic body disposed on the other side in the axial direction from the first elastic body, A plurality of second pressure receiving liquid chambers having both of these elastic bodies as part of the wall surface are defined between the first elastic body and the second elastic body, and the partition member includes the first elastic body. A first restriction passage communicating the pressure receiving liquid chamber and the sub liquid chamber; a plurality of second restriction passages communicating the plurality of second pressure receiving liquid chambers and the sub liquid chamber separately; or the plurality of second restriction passages. A second restriction passage that communicates the pressure-receiving liquid chambers, and the plurality of second pressure-receiving chambers define an annular space between the first elastic body and the second elastic body in the circumferential direction. An anti-vibration device defined by a plurality of partition walls disposed, wherein the second elastic body is connected to the partition wall at a connecting portion that bulges toward the other side in the axial direction. A protruding portion is formed.

According to this invention, since the bulging portion that bulges toward the other side in the axial direction is formed at the connecting portion of the second elastic body with the partition wall, the rigidity of the partition wall is increased. When the lateral vibration perpendicular to the axial direction is input and a part of the plurality of second pressure receiving liquid chambers is reduced, the partition wall can improve the force with which the second pressure receiving liquid chamber is pushed. In addition, it is possible to suppress deformation of the wall portion that defines the second pressure receiving liquid chamber.
Therefore, when a lateral vibration is input and the second pressure receiving liquid chamber is contracted, a liquid having a flow rate as designed corresponding to the magnitude of the input vibration can be caused to flow into the second restriction passage. Therefore, it is possible to reliably attenuate and absorb lateral vibration.
Further, since the bulging portion is formed in the second elastic body, coupled with the fact that the rigidity of the partition wall is increased, the second elastic body reaches the first elastic body via the partition wall. Cracks can be prevented from occurring.
In addition, since the bulging portion is formed at the connecting portion with the partition wall in the second elastic body, and is not formed in the entire area of the second elastic body, the above-described effects can be achieved, It is possible to prevent the vibration having a relatively high frequency from being attenuated and absorbed, that is, to prevent the high frequency characteristics from deteriorating.

  Here, a flange portion protruding outward in the radial direction is formed on a portion of the second mounting member located on the other side in the axial direction from the second elastic body, and the bulging portion May be coupled to the flange portion.

  In this case, since the bulging part is connected to the flange part of the second mounting member, the rigidity of the partition wall can be further increased.

  According to this invention, it is possible to reliably attenuate and absorb the vibration in the lateral direction, and to prevent a crack from the second elastic body to the first elastic body through the partition wall.

It is a top view of a vibration isolator shown as one embodiment concerning the present invention. It is AA arrow sectional drawing of the vibration isolator shown in FIG. FIG. 3 is a cross-sectional view of the vibration isolator shown in FIG. It is the side view which looked at the bulging part of the vibration isolator shown in FIGS. 1-3 from the radial outer side.

Hereinafter, an embodiment of a vibration isolator according to the present invention will be described with reference to FIGS.
The vibration isolator 1 includes a cylindrical first mounting member 11 connected to one of the vibration generating unit and the vibration receiving unit, a second mounting member 12 connected to the other, and the first of these. A first elastic body 13 that elastically connects the second mounting members 11, 12, and a first elastic body 13 that is spaced apart from one side in the axial direction along the central axis O of the first mounting member 11. In addition, a diaphragm 14 defining a liquid chamber 15 between the first elastic body 13, a liquid chamber 15, a first pressure receiving liquid chamber 16 and the diaphragm 14 having the first elastic body 13 as a part of the wall surface. The partition member 18 partitioned into a sub liquid chamber 17 as a part of the wall surface, and the first and second mounting members 11 and 12 are elastically connected to each other, and the other side in the axial direction from the first elastic body 13. A second elastic body 19 disposed on the first elastic body 13 and a second elastic body. A plurality of second pressure receiving liquid chambers 21 having both of these elastic bodies 13, 19 as part of the wall surface are defined between the first pressure receiving liquid chamber 16 and the sub liquid chamber 17. Are formed, and a plurality of second restriction passages 23 for communicating the plurality of second pressure receiving liquid chambers 21 and the auxiliary liquid chambers 17 with each other are formed.

  Hereinafter, the one side in the axial direction is referred to as the lower side, the other side in the axial direction is referred to as the upper side, and the direction orthogonal to the central axis O in the plan view of the vibration isolator 1 viewed from the axial direction is the diameter. A direction that goes around the central axis O is called a circumferential direction.

  As shown in FIG. 3, the first attachment member 11 is formed in a multistage cylindrical shape that gradually decreases in diameter from the upper side toward the lower side. Further, as shown in FIG. 2, openings 11 a penetrating in the radial direction are formed in the first mounting member 11 at positions facing each other across the central axis O in the radial direction. In the illustrated example, two openings 11 a are formed in the first attachment member 11. The opening 11a is located over the entire length in the axial direction of the intermediate portion between the upper end portion and the lower end portion of the first mounting member 11, and is formed in a belt shape extending in the circumferential direction.

  The second attachment member 12 is formed in a rod shape that is disposed coaxially with the central axis O. The second mounting member 12 is disposed on the inner side in the radial direction of the first mounting member 11. A flange portion 12 a that protrudes outward in the radial direction is formed at an intermediate position in the axial direction of the second mounting member 12. Of the flange portion 12a, a portion along the circumferential direction where the opening 11a of the first mounting member 11 is located has a smaller amount of protrusion toward the radially outer side than the other portion. In the illustrated example, as shown in FIG. 1, the flange portion 12 a has a rectangular shape with short sides extending in a direction in which the two openings 11 a face each other in a plan view viewed from the axial direction.

As shown in FIG. 2, the first elastic body 13 is formed in a cylindrical shape whose diameter is gradually reduced from the lower side toward the upper side, the upper end portion thereof being connected to the lower end portion of the second mounting member 12, and the lower end The part is connected to the lower end of the first attachment member 11.
The second elastic body 19 is formed in an annular shape, and its radially inner end is connected to a portion of the outer peripheral surface of the second mounting member 12 that is located directly below the flange portion 12a, and the radially outer end. Is connected to the upper end of the first mounting member 11. The second elastic body 19 is formed thinner than the first elastic body 13. The radially inner end of the second elastic body 19 is connected to the upper end of the first elastic body 13, and the first elastic body 13 and the second elastic body 19 are integrally formed. A connecting portion between the upper end portion of the first elastic body 13 and the inner end portion in the radial direction of the second elastic body 19 is formed in a curved shape that is recessed toward the inner side in the radial direction. In the illustrated example, the radially inner end of the second elastic body 19 is located above the radially outer end of the second elastic body 19.

  In the illustrated example, two second pressure receiving liquid chambers 21 between the first elastic body 13 and the second elastic body 19 are provided, and these second pressure receiving liquid chambers 21 are the first elastic body 13. And two partition walls 24 that partition the annular space between the first elastic body 19 and the second elastic body 19 in the circumferential direction. The partition wall 24 is connected to a portion located between the two openings 11 a adjacent to each other in the circumferential direction in the intermediate portion of the first mounting member 11. The partition wall 24 is formed integrally with the first and second elastic bodies 13 and 19. The two partition walls 24 are arranged in the same straight line in a plan view of the vibration isolator 1 viewed from the axial direction.

  The partition member 18 communicates the accommodating chamber 26 in which the membrane 25 is accommodated, the first communication hole 27 that communicates the accommodating chamber 26 and the first pressure-receiving liquid chamber 16, and the accommodating chamber 26 and the auxiliary liquid chamber 17. A second communication hole 28 is formed. The first restriction passage 22 is formed in the partition member 18 at a portion located on the outer side in the radial direction from the accommodation chamber 26 and the first and second communication holes 27 and 28. The second restriction passage 23 is formed on the outer peripheral surface of the partition member 18. In the illustrated example, the partition member 18 is formed in a bottomed cylindrical shape, and the accommodation wall 26, the first and second communication holes 27 and 28, and the first restriction passage 22 are formed in the bottom wall portion, and the inside of the peripheral wall portion is formed. The lower end portion of the first mounting member 11 is fitted to the first mounting member 11. Further, the storage chamber 26 and the first and second communication holes 27 and 28 are formed in the central portion in the radial direction of the bottom wall portion of the partition member 18.

Here, in the present embodiment, the outer cylinder 29 is externally fitted integrally with the entire region of the first mounting member 11 except the lower end portion and the peripheral wall portion of the partition member 18. The outer cylinder 29 closes the opening 11a of the first attachment member 11 in a liquid-tight manner. The first attachment member 11 is connected to either one of the vibration generating unit and the vibration receiving unit via the outer cylinder 29.
A diaphragm member 31 formed in a bottomed cylindrical shape with an elastic material is extended downward at the lower end portion of the outer cylinder 29, and the bottom wall portion of the partition member 18 is fitted into the diaphragm member 31. ing. A central portion of the bottom portion of the diaphragm member 31 defines a sub liquid chamber 17 and is a diaphragm 14 that expands and contracts as the liquid flows into and out of the sub liquid chamber 17.

And in this embodiment, the bulging part 35 which bulges upwards is formed in the connection part with the partition wall 24 in the 2nd elastic body 19. As shown in FIG.
The bulging portion 35 is formed at each connection portion with the plurality of partition walls 24 in the second elastic body 19. As shown in FIGS. 3 and 4, the bulging portion 35 is formed over the entire area in the radial direction on the outer surface facing upward, out of the surface of the second elastic body 19. The bulging portion 35 gradually decreases in length in the circumferential direction from the radially outer side toward the inner side. The circumferential length of the partition wall 24 is shorter than the circumferential length at the radially outer end of the bulging portion 35. Both peripheral end portions 35a of the bulging portion 35 extend toward the inner side in the circumferential direction so as to gradually approach each other from the inner side toward the outer side in the radial direction.

The bulging portion 35 is connected to the flange portion 12 a of the second mounting member 12.
In the illustrated example, the radially inner end portion of the bulging portion 35 is connected to the short side portion of the flange portion 12a that forms a rectangular shape in plan view as viewed from the axial direction. Further, the radially inner end portion of the bulging portion 35 is coupled to the lower surface of the flange portion 12a. The center portions in the circumferential direction of the bulging portion 35, the partition wall 24, and the short side portions of the flange portion 12a are coincident with each other.

  Here, the flow path length and the flow path cross-sectional area of the first restriction passage 22 are set (tuned) so that the resonance frequency of the first restriction passage 22 becomes a predetermined frequency. The channel length and the channel cross-sectional area of the second restriction passage 23 are set (tuned) so that the resonance frequency of the second restriction passage 23 becomes a predetermined frequency. Examples of the predetermined frequency include a frequency of idle vibration (for example, a frequency of 18 Hz to 30 Hz and an amplitude of ± 0.5 mm or less), and a shake vibration having a frequency lower than that of the idle vibration (for example, or a frequency of 14 Hz or less). , The amplitude of which is greater than ± 0.5 mm).

Note that the vibration isolator 1 of the present embodiment is a compression type (positive) that is attached and used so that the first pressure receiving liquid chamber 16 is positioned on the upper side in the vertical direction and the auxiliary liquid chamber 17 is positioned on the lower side in the vertical direction. The composition is vertical.
For example, when the vibration isolator 1 is attached to an automobile, the second attachment member 12 is connected to an engine or the like as a vibration generating unit, while the first attachment member 11 and the outer cylinder 29 are subjected to vibration reception via a bracket (not shown). It is used by being connected to a vehicle body as a part. In an automobile, main vibration along the vertical direction and side vibration along the front-rear direction or the left-right direction of the vehicle body are easily input from the engine to the vehicle body. The vibration isolator 1 is attached such that the direction in which the two second pressure receiving liquid chambers 21 face each other is coincident with, for example, the front-rear direction or the left-right direction, and main vibration is input in the axial direction. The secondary vibration is input in the direction in which the second pressure receiving liquid chambers 21 face each other.

  Next, the operation of the vibration isolator 1 configured as described above will be described.

First, when a main vibration is input from the vibration generating unit, the first mounting member 11 and the second mounting member 12 are relatively displaced in the axial direction while elastically deforming the first elastic body 13.
At this time, for example, the first pressure receiving liquid chamber 16 is expanded or contracted due to relative displacement between the first mounting member 11 and the second mounting member 12, elastic deformation of the first elastic body 13, or the like. Further, the liquid flows through the first restriction passage 22 between the first pressure receiving liquid chamber 16 and the sub liquid chamber 17, and liquid column resonance occurs in the first restriction passage 22. Thereby, vibration having a frequency equivalent to the resonance frequency of the first restriction passage 22 is absorbed and attenuated.

In addition, when the secondary vibration is input from the vibration generating unit, the first attachment member 11 and the second attachment member 12 cause the two second pressure receiving members while elastically deforming the first elastic body 13 and the second elastic body 19. The liquid chambers 21 are relatively displaced in directions facing each other. As a result, the pair of second pressure receiving liquid chambers 21 expands and contracts separately, and the liquid flows through the second restriction passage 23 between the second pressure receiving liquid chamber 21 and the sub liquid chamber 17, so that the inside of the second restriction passage 23. Liquid column resonance occurs. Further, vibration having a frequency equivalent to the resonance frequency of the second restriction passage 23 is absorbed and attenuated.
The membrane 25 is deformed or displaced in the axial direction in the accommodating chamber 26 in response to the input of the high frequency vibration, and the first pressure receiving liquid chamber 16 and the auxiliary liquid chamber 17 are passed through the first and second communication holes 27 and 28. By allowing the liquid to flow between them, an increase in the dynamic spring constant of the first elastic body 13 is suppressed, and this vibration is absorbed and damped.

As described above, according to the vibration isolator 1 according to the present embodiment, the bulging portion 35 that bulges upward is formed at the connection portion of the second elastic body 19 with the partition wall 24. Then, the rigidity of the partition wall 24 is increased, and when the secondary vibration is input and one of the two second pressure receiving liquid chambers 21 is contracted, the partition wall 24 pushes the second pressure receiving liquid chamber 21 into force. And the deformation of the wall portion defining the second pressure-receiving liquid chamber 21 can be suppressed.
Therefore, when the secondary vibration is inputted and the second pressure receiving liquid chamber 21 is contracted, the liquid having the flow rate as designed corresponding to the magnitude of the inputted vibration can be caused to flow into the second restriction passage 23. Thus, the secondary vibration can be reliably damped and absorbed.
In addition, since the bulging portion 35 is formed in the second elastic body 19, coupled with the fact that the rigidity of the partition wall 24 is increased, the second elastic body 19 passes the partition wall 24 through the partition wall 24. It is possible to prevent a crack reaching the elastic body 13 from occurring.
Moreover, since the bulging part 35 is formed in the connection part with the partition wall 24 in the 2nd elastic body 19, and is not formed in the whole region of the 2nd elastic body 19, there exists the above-mentioned effect. On the other hand, it is possible to prevent the vibration having a relatively high frequency from being attenuated and absorbed, that is, to prevent the high frequency characteristics from deteriorating.
Moreover, since the bulging part 35 is connected with the flange part 12a of the 2nd attachment member 12, the rigidity of the partition wall 24 can be improved further.

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

For example, in the said embodiment, although the compression-type structure was shown as the vibration isolator 1, the 2nd pressure receiving liquid chamber 21 is located in the vertical direction lower side, and the sub liquid chamber 17 is located in the vertical direction upper side. It may be a suspended structure that is used by being attached.
In the above embodiment, the partition member 18 is formed with the plurality of second restriction passages 23 for communicating the plurality of second pressure receiving liquid chambers 21 and the sub liquid chambers 17 with each other. You may form the 2nd restriction | limiting channel | path which mutually connects the 2nd pressure receiving liquid chambers 21 of each other.
Further, the bulging portion 35 may not be connected to the flange portion 12a of the second mounting member 12.

  In addition, it is possible to appropriately replace the constituent elements in the above-described embodiments with well-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 1 Vibration isolator 11 1st attachment member 12 2nd attachment member 12a Flange part 13 1st elastic body 14 Diaphragm 15 Liquid chamber 16 1st pressure receiving liquid chamber 17 Sub liquid chamber 18 Partition member 19 2nd elastic body 21 2nd pressure receiving liquid Chamber 22 First restricted passage 23 Second restricted passage 35 Swelling portion

Claims (2)

A cylindrical first mounting member connected to one of the vibration generating unit and the vibration receiving unit, and a second mounting member connected to the other and disposed radially inside the first mounting member; ,
A first elastic body that elastically connects these first and second mounting members;
A diaphragm that is disposed apart from the first elastic body on one side in the axial direction of the first mounting member, and that defines a liquid chamber between the first elastic body;
A partition member that divides the liquid chamber into a first pressure receiving liquid chamber having the first elastic body as a part of a wall surface and a sub liquid chamber having the diaphragm as a part of a wall surface;
A second elastic body that elastically connects the first and second mounting members and is disposed on the other side in the axial direction from the first elastic body,
Between the first elastic body and the second elastic body, a plurality of second pressure receiving liquid chambers having both the elastic bodies as part of the wall surface are defined,
A first restriction passage that communicates the first pressure receiving liquid chamber and the sub liquid chamber to the partition member, and a plurality of second restrictions that communicate the plurality of second pressure receiving liquid chambers and the sub liquid chamber separately. A passage, or a second restriction passage communicating the plurality of second pressure receiving fluid chambers, is formed,
The plurality of second pressure receiving liquid chambers are defined by a plurality of partition walls that divide an annular space between the first elastic body and the second elastic body in a circumferential direction. Because
An anti-vibration device characterized in that a bulging portion that bulges toward the other side in the axial direction is formed at a portion of the second elastic body connected to the partition wall. Of the second mounting member, a flange portion projecting outward in the radial direction is formed on a portion located on the other side in the axial direction from the second elastic body,
The vibration isolator according to claim 1, wherein the bulging portion is connected to the flange portion.

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