JP6388442B2 - Vibration isolator - Google Patents

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 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 A plurality of 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, when a load in a direction in which the first and second mounting members approach each other in the axial direction is applied, a large load is easily applied to the first elastic body. There was a problem that it was difficult to provide the body with sufficient durability.

  The present invention has been made in view of such circumstances, and an object thereof is to provide a vibration isolator capable of improving the durability of the first elastic body.

  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. And a second restricting passage communicating with the pressure receiving liquid chambers, wherein the second mounting member is formed with a bulging portion that bulges toward the second pressure receiving liquid chamber. The first elastic body gradually decreases in diameter from one side in the axial direction toward the other side, and the bulging portion is connected to an end on the other side in the axial direction. Of the end portion on the other side in the axial direction, toward the radially inner side of the outer peripheral surface of the portion located on the radially outer side of the bulging portion Wherein the non-recessed portion is formed.

  According to this invention, since the hollow portion is formed on the outer peripheral surface of the portion located on the radially outer side of the bulging portion of the other end portion of the first elastic body in the axial direction, When a compressive load is applied to the device in a direction in which the first and second mounting members approach each other in the axial direction, the first elastic body is bent by using the recess as a base point. While it becomes easy to bulge and deform in a direction perpendicular to the peripheral surface, it becomes possible to stably and reasonably express such a deformation mode of the first elastic body, and to improve the durability of the first elastic body. be able to.

  Here, the second elastic body is formed in an annular shape, and a radially inner end portion of the second elastic body is connected to an outer peripheral surface of the second mounting member, and a surface of the second elastic body is Among these, the radially inner end of the inner surface that defines the second pressure receiving liquid chamber may be located on the radially inner side of the bulged portion with the largest outer diameter.

In this case, since the inner end in the radial direction on the inner surface of the second elastic body is located on the inner side in the radial direction from the portion of the bulging portion having the largest outer diameter, the radial inner end of the inner surface of the second elastic body is It is possible to ensure a long length, and it is possible to easily deform the second elastic body flexibly according to the fluid pressure fluctuation in the second pressure receiving fluid chamber.
Therefore, as described above, when a compressive load is applied to the vibration isolator, the first elastic body tends to bulge and deform in a direction perpendicular to the peripheral surface, and the hydraulic pressure in the second pressure receiving liquid chamber is reduced. Although the height tends to increase, it is possible to prevent the durability of the second elastic body from being lowered.

  Further, an end edge on the one axial side in the bulging portion forms a part of an end surface on the one axial side in the second mounting member, and the one axial side in the second mounting member. The end face of may be flush with the entire surface.

  In this case, when the above-described compressive load is applied, the first elastic body can be reliably bent with the recessed portion as a base point, and the first pressure receiving force accompanying the movement of the second mounting member in the axial direction is possible. The fluctuation of the internal volume of the liquid chamber can be increased, and the desired vibration isolation characteristics can be stably exhibited.

  According to this invention, the durability of the first elastic body can be improved.

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.

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.

In the present embodiment, the second mounting member 12 is formed with a first bulging portion 35 that bulges toward the second pressure receiving fluid chamber 21 and is connected to the upper end portion of the first elastic body 13. Of the upper end portion of the elastic body 13, a recess 13 a that is recessed toward the radially inner side is formed on the outer peripheral surface of the portion located on the radially outer side of the first bulging portion 35.
The first bulging portion 35 is formed in at least a portion of the outer peripheral surface of the lower end portion of the second mounting member 12 that faces the second pressure receiving liquid chamber 21. The first bulging portion 35 has an inclined surface 35a that gradually extends downward as it goes radially outward, and a straight face 35b that extends along the axial direction downward from the lower end of the inclined surface 35a. I have. Of the first bulge portion 35, the true face 35b is the largest outer diameter portion having the largest outer diameter.
Further, the radially inner end portion of the second elastic body 19 is connected to a portion of the outer peripheral surface of the second mounting member 12 positioned above the first bulging portion 35. Of the surface of the second elastic body 19, the radially inner end of the inner surface that defines the second pressure receiving liquid chamber 21 is located on the radially inner side from the true face 35 b of the first bulging portion 35.

The upper end portion of the first elastic body 13 has an outer shape along the inclined surface 35 a and the true face 35 b of the first bulge portion 35. Of the upper end portion of the first elastic body 13, a portion (hereinafter referred to as a projecting surface portion) 13 b that covers the connecting portion of the inclined surface 35 a and the true face 35 b in the first bulging portion 35 projects outward in the radial direction. It is formed in a curved shape. The recessed portion 13a is continuous with the lower end of the projecting surface portion 13b, and is formed on the outer peripheral surface of the upper end portion of the first elastic body 13 that is located on the radially outer side of the face 35b of the first bulging portion 35. ing.
The recess 13a is formed in a concave curved shape that is recessed toward the inside in the radial direction.

Moreover, the lower end edge of the 1st bulging part 35 comprises a part of lower end surface of the 2nd attachment member 12, and the lower end surface of the 2nd attachment member 12 is flush over the whole region.
A second bulging portion 36 that bulges toward the partition wall 24 is formed at the lower end of the second mounting member 12. The second bulging portion 36 has an upper inclined surface 36a that gradually extends downward as it goes radially outward, and a lower slope that gradually extends radially inward as it goes downward from the lower end of the upper inclined surface 36a. And a surface 36b.
The first bulging portion 35 extends over the entire circumference of the portion of the second mounting member 12 facing the second pressure receiving fluid chamber 21, and the second bulging portion 36 is a partition of the second mounting member 12. It extends over the entire circumference of the part facing the wall 24. The first bulging portion 35 and the second bulging portion 36 are alternately arranged over the entire circumference of the second mounting member 12.

  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 recessed portion 13a is formed on the outer peripheral surface of the portion located on the radially outer side of the first bulging portion 35 in the upper end portion of the first elastic body 13. When the compression load in the direction in which the first and second mounting members 11 and 12 approach each other in the axial direction is applied to the vibration isolator 1, the first elastic body 13 is The first elastic body 13 is easily bulged and deformed in a direction perpendicular to the peripheral surface by bending the dent 13a as a base point, and the deformation mode of the first elastic body 13 can be stably and easily performed. It becomes possible to express, and the durability of the first elastic body 13 can be improved.

Further, since the inner end in the radial direction on the inner surface of the second elastic body 19 is positioned on the inner side in the radial direction from the true face 35 b of the first bulging portion 35, the radial inner end of the second elastic body 19 is in the radial direction. A long length can be secured, and the second elastic body 19 can be easily deformed flexibly according to the fluid pressure fluctuation in the second pressure receiving fluid chamber 21.
Therefore, as described above, when a compressive load is applied to the vibration isolator 1, the first elastic body 13 tends to bulge and deform in a direction perpendicular to the peripheral surface thereof, and the second pressure receiving liquid chamber 21 Although the hydraulic pressure tends to increase, the durability of the second elastic body 19 can be prevented from decreasing.

  Moreover, since the lower end edge of the 1st bulging part 35 comprises a part of lower end surface of the 2nd attachment member 12, and the lower end surface of the 2nd attachment member 12 is flush over the whole region, this anti-vibration When the aforementioned compressive load is applied to the device 1, the first elastic body 13 can be reliably bent with the recess 13a as a starting point, and the second mounting member 12 is moved in the axial direction. The variation in the internal volume of the first pressure receiving liquid chamber 16 can be increased, and the desired vibration isolation characteristics can be stably exhibited.

  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.
Further, the inner end in the radial direction on the inner surface of the second elastic body 19 may be positioned at the same position in the radial direction or at the outer side in the radial direction with respect to the true face 35 b of the first bulging portion 35.
Further, the axial positions of the lower end edge of the first bulging portion 35 and the lower end surface of the second mounting member 12 may be different from each other.
Further, the second bulging portion 36 may not be disposed on the second mounting member 12.
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.

  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 13 1st elastic body 13a hollow part 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 restriction passage 23 Second restriction passage 35 Swelling part (first swelling part)

Claims (3)

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 vibration isolator in which a passage or a second restriction passage communicating the plurality of second pressure receiving liquid chambers is formed,
The second mounting member is formed with a bulging portion that bulges toward the second pressure receiving liquid chamber,
The first elastic body is gradually reduced in diameter as it goes from one side in the axial direction to the other side, and the bulging part is connected to an end on the other side in the axial direction,
Of the end portion on the other side in the axial direction of the first elastic body, a hollow portion that is recessed radially inward is formed on the outer peripheral surface of the portion located on the radially outer side of the bulging portion. An anti-vibration device characterized by that. The second elastic body is formed in an annular shape, and the radially inner end of the second elastic body is connected to the outer peripheral surface of the second mounting member,
Of the surface of the second elastic body, the radially inner end of the inner surface defining the second pressure receiving liquid chamber is located on the radially inner side of the bulged portion with the largest outer diameter. The vibration isolator according to claim 1, wherein An end edge on one side in the axial direction in the bulging portion forms a part of an end surface on the one side in the axial direction in the second mounting member,
The vibration isolator according to claim 1, wherein an end face on one side in the axial direction of the second mounting member is flush with the entire area.

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