阅读说明：本技术 隔振装置 (Vibration isolation device ) 是由 小岛宏 于 2018-01-16 设计创作，主要内容包括：在本发明中,第2液室(27)、第3液室(28)以及第4液室(29)中的任意两个液室经由形成于外侧安装构件(11)、内侧安装构件(12)或者分隔构件(15)的第1限制通路(31)互相连通,剩余一个液室与形成于外侧安装构件(11)、内侧安装构件(12)或者分隔构件(15)的第5液室(32)连通,剩余一个液室在周向上被分割,这些在周向上被分割成的各液室和第5液室(32)通过形成于外侧安装构件(11)、内侧安装构件(12)或者分隔构件(15)的第2限制通路(33)分别互相连通。(In the present invention, any two of the 2 nd liquid chamber (27), the 3 rd liquid chamber (28), and the 4 th liquid chamber (29) communicate with each other via the 1 st limiting passage (31) formed in the outer mounting member (11), the inner mounting member (12), or the partition member (15), the remaining one liquid chamber communicates with the 5 th liquid chamber (32) formed in the outer mounting member (11), the inner mounting member (12), or the partition member (15), the remaining one liquid chamber is divided in the circumferential direction, and the respective circumferentially divided liquid chambers and the 5 th liquid chamber (32) communicate with each other via the 2 nd limiting passage (33) formed in the outer mounting member (11), the inner mounting member (12), or the partition member (15), respectively.)

1. A vibration isolation device, wherein,

The vibration isolation device includes:

An outer mounting member that is cylindrical and coupled to either one of the vibration generating portion and the vibration receiving portion, and an inner mounting member that is coupled to the other one of the vibration generating portion and the vibration receiving portion and is disposed inside the outer mounting member;

A pair of first body rubbers 1 which connect the outer mounting member and the inner mounting member and are arranged at intervals in an axial direction along a center axis of the outer mounting member;

A partition member that partitions a liquid chamber between the pair of the 1 st main body rubbers into a 1 st liquid chamber and a 2 nd liquid chamber in the axial direction; and

A 2 nd body rubber that divides the 1 st liquid chamber into a 3 rd liquid chamber in which the 1 st body rubber is a part of a partition wall and a 4 th liquid chamber in which the partition member is a part of a partition wall,

Any two of the 2 nd liquid chamber, the 3 rd liquid chamber, and the 4 th liquid chamber communicate with each other via a 1 st limiting passage formed in the outer mounting member, the inner mounting member, or the partition member, and the remaining one liquid chamber communicates with a 5 th liquid chamber formed in the outer mounting member, the inner mounting member, or the partition member,

The remaining one liquid chamber is divided in a circumferential direction around the central axis, and each of these circumferentially divided liquid chambers and the 5 th liquid chamber communicate with each other via a 2 nd limiting passage formed in the outer mounting member, the inner mounting member, or the partition member, respectively.

2. The vibration isolation device according to claim 1,

The 1 st limiting passage communicates the 3 rd liquid chamber and the 2 nd liquid chamber or communicates the 4 th liquid chamber and the 2 nd liquid chamber.

3. The vibration isolation device according to claim 1 or 2,

the 2 nd limiting passage and the 5 th liquid chamber are formed in the same member among the outer mounting member, the inner mounting member, and the partition member,

The 1 st limiting path is formed in a member different from the member in which the 2 nd limiting path and the 5 th liquid chamber are formed, among the outer mounting member, the inner mounting member, and the partition member.

4. The vibration isolation device according to any one of claims 1 to 3,

The vibration isolating device includes a diaphragm forming a part of a partition wall of the 5 th liquid chamber.

Technical Field

The present invention relates to a vibration damping device which is applied to, for example, automobiles, industrial machines, and the like and absorbs and damps vibration of a vibration generating portion such as an engine.

The present application claims priority based on application No. 2017-114183 filed in japan on 6, 9 and 2017, the contents of which are incorporated herein by reference.

Background

Conventionally, there is known a vibration damping device including: an outer mounting member and an inner mounting member, the outer mounting member being cylindrical and coupled to one of the vibration generating section and the vibration receiving section, the inner mounting member being coupled to the other of the vibration generating section and the vibration receiving section and being disposed inside the outer mounting member; a main rubber that connects the outer mounting member and the inner mounting member and that closes one opening of the outer mounting member in an axial direction along the center axis; a diaphragm that closes an opening on the other axial side of the outer attachment member; and a partition member that divides the liquid chamber in the outer mounting member into a main liquid chamber having a body rubber in a part of the partition wall and an auxiliary liquid chamber having a diaphragm in a part of the partition wall.

As such a vibration damping device, for example, as shown in patent document 1 below, a structure is known which includes: a partition wall rubber that connects the outer mounting member and the inner mounting member and divides the main liquid chamber into a 1 st liquid chamber having a partition member in a part of the partition wall and a 2 nd liquid chamber having a body rubber in a part of the partition wall; a dividing rubber that divides the 2 nd liquid chamber into two divided liquid chambers in a circumferential direction; a 1 st limiting path which communicates the 1 st liquid chamber and the auxiliary liquid chamber; and two 2 nd limiting passages which communicate the two divided liquid chambers with each other through the auxiliary liquid chamber.

When the vibration in the axial direction is input, the vibration is damped and absorbed by the liquid flowing between the 1 st liquid chamber and the auxiliary liquid chamber through the 1 st limiting passage, and when the vibration in the lateral direction intersecting the axial direction is input, the vibration is damped and absorbed by the liquid flowing between the two divided liquid chambers through the 2 nd limiting passage and the auxiliary liquid chamber.

Disclosure of Invention

problems to be solved by the invention

However, in the conventional vibration damping device, since the liquid chamber in which the 1 st liquid chamber communicates via the 1 st limiting passage and the liquid chamber in which the divided liquid chambers communicate via the 2 nd limiting passage are both the same auxiliary liquid chamber, when the axial vibration is input, the liquid flowing between the 1 st liquid chamber and the auxiliary liquid chamber via the 1 st limiting passage flows into the 2 nd limiting passage, or when the lateral vibration is input, the liquid flowing between the two divided liquid chambers via the 2 nd limiting passage and the auxiliary liquid chamber flows into the 1 st limiting passage, and there is a possibility that the generated damping force is reduced and it is difficult to exhibit the desired vibration damping performance.

The present invention has been made in view of the above circumstances, and an object thereof is to provide a vibration damping device capable of ensuring a damping force against vibrations in the axial direction and the lateral direction.

Means for solving the problems

The vibration isolation device of the present invention includes: an outer mounting member that is cylindrical and coupled to either one of the vibration generating portion and the vibration receiving portion, and an inner mounting member that is coupled to the other one of the vibration generating portion and the vibration receiving portion and is disposed inside the outer mounting member; a pair of first body rubbers 1 which connect the outer mounting member and the inner mounting member and are arranged at intervals in an axial direction along a center axis of the outer mounting member; a partition member that partitions a liquid chamber between the pair of the 1 st main body rubbers into a 1 st liquid chamber and a 2 nd liquid chamber in the axial direction; and a 2 nd main body rubber dividing the 1 st liquid chamber into a 3 rd liquid chamber in which the 1 st main body rubber is a part of a partition wall and a 4 th liquid chamber in which the partition member is a part of a partition wall, any two of the 2 nd liquid chamber, the 3 rd liquid chamber, and the 4 th liquid chamber communicate with each other via a 1 st limiting passage formed in the outer mounting member, the inner mounting member, or the partition member, and the remaining one liquid chamber communicates with a 5 th liquid chamber formed in the outer mounting member, the inner mounting member, or the partition member, the remaining one liquid chamber being divided in a circumferential direction around the central axis, these circumferentially divided liquid chambers and the 5 th liquid chamber communicate with each other via 2 nd limiting passages formed in the outer mounting member, the inner mounting member, or the partition member, respectively.

ADVANTAGEOUS EFFECTS OF INVENTION

According to the present invention, a damping force can be ensured against each of the vibrations in the axial direction and the lateral direction.

Drawings

Fig. 1 is a longitudinal sectional view of a vibration damping device according to an embodiment of the present invention.

Fig. 2 is a sectional view taken along line a-a of the vibration isolation device shown in fig. 1.

Fig. 3 is a schematic view of the vibration isolation device shown in fig. 1 and 2.

Detailed Description

Hereinafter, an antivibration device 10 according to an embodiment of the present invention will be described with reference to the drawings.

As shown in fig. 1, the vibration isolation device 10 includes: an outer mounting member 11 and an inner mounting member 12, the outer mounting member 11 being cylindrical and coupled to one of the vibration generating section and the vibration receiving section, the inner mounting member 12 being coupled to the other of the vibration generating section and the vibration receiving section and being disposed inside the outer mounting member 11; a pair of first body rubbers 13a, 13b that connect the outer mounting member 11 and the inner mounting member 12 and are disposed at intervals in an axial direction along the center axis O of the outer mounting member 11; and a partition member 15 that partitions the liquid chamber 14 between the pair of 1 st main body rubbers 13a, 13b in the axial direction.

hereinafter, in a plan view seen from the axial direction, a direction perpendicular to the central axis O is referred to as a radial direction, and a direction surrounding the central axis O is referred to as a circumferential direction.

the liquid chamber 14 is filled with, for example, ethylene glycol, water, silicone oil, and the like. The vibration damping device 10 is applied to, for example, a vehicle cabin mounting seat, and is used in a state where the axial direction is directed in the vertical direction.

the outer attachment member 11 includes a cylindrical main cylinder 16, an annular 1 st outer member 17 disposed at an end edge of one side in the axial direction of the main cylinder 16, an annular 2 nd outer member 18 disposed at an end edge of the other side in the axial direction of the main cylinder 16, and an annular 3 rd outer member 19 disposed at a surface of one side in the axial direction of the 1 st outer member 17. A plurality of mounting holes 11a are formed in the outer mounting member 11 at intervals in the circumferential direction so as to integrally penetrate the main cylinder 16, the 1 st outer member 17, the 2 nd outer member 18, and the 3 rd outer member 19 in the axial direction. The main cylinder 16, the 1 st outer member 17, the 2 nd outer member 18, and the 3 rd outer member 19 are integrally fixed by nuts screwed to bolts, not shown, that pass through the mounting holes 11 a.

Hereinafter, one side in the axial direction is referred to as an upper side, and the other side in the axial direction is referred to as a lower side.

The 1 st outer member 17 includes a 1 st ring plate 17a disposed at the upper end opening edge of the main cylinder 16, and a fitting cylinder 17b projecting downward from the inner peripheral edge of the 1 st ring plate 17a and fitted into the upper end portion of the main cylinder 16. The 1 st ring plate 17a and the fitting cylinder 17b are disposed coaxially with the central axis O.

The 2 nd outer member 18 is an annular plate disposed at the lower end opening edge of the main cylinder 16 and coaxially disposed with the center axis O. The inner peripheral portion of the 2 nd outer member 18 is located radially inward of the inner peripheral surface of the main cylinder 16. A fitting projection 18a is formed in the entire circumference of the 2 nd outer member 18, and the fitting projection 18a projects upward and is fitted into the lower end portion of the main cylinder 16.

The 3 rd outer member 19 includes a 3 rd ring plate 19a disposed on the upper surface of the 1 st outer member 17 and a protruding tube 19b protruding upward from the inner peripheral edge of the 3 rd ring plate 19 a. The 3 rd ring plate 19a and the protruding cylindrical portion 19b are disposed coaxially with the central axis O.

the outer attachment member 11 may be integrally formed as a whole, or may be modified as appropriate.

The inner attachment member 12 is disposed radially inward of the outer attachment member 11. The inner attachment member 12 is cylindrical and is disposed coaxially with the central axis O. The axial ends of the inner attachment member 12 are located on the outer side in the axial direction than the outer attachment member 11.

The inner attachment member 12 includes a core cylinder body 20, a main body cylinder 21 covering the entire outer peripheral surface of the core cylinder body 20, and an outer fitting cylinder 22 fitted to the main body cylinder 21. The axial length and the axial position of each of the main body cylinder 21, the core cylinder 20, and the outer fitting cylinder 22 are the same as each other. The main body tube 21 is made of a material having a lower hardness than the core tube 20 and the outer tube 22. For example, the main body cylinder 21 is formed of a soft material such as a rubber material or an elastic body, and the core cylinder 20 and the outer fitting cylinder 22 are formed of a hard material such as a synthetic resin material or a metal material.

At the lower end of the core barrel 20, radially penetrating openings 20a are formed on both sides of the center axis O in the radial direction. The opening 20a has a rectangular shape with a pair of edges extending in the axial direction and the remaining pair of edges extending in the circumferential direction when viewed from the radially outer side. The opening 20a has a rectangular shape that is long in the circumferential direction when viewed from the outside in the radial direction. The opening 20a is located above the lower end edge of the core barrel 20. The outer peripheral surface of the core cylinder 20 is bonded to the inner peripheral surface of the main cylinder 21.

A wide annular groove 21a continuously extending over the entire circumference is formed in the outer peripheral surface of the lower end portion of the main body tube 21. The portion of the main body tube 21 forming the groove bottom of the annular groove 21a is formed in a film shape having a smaller thickness than the other portions. The annular groove 21a is disposed over the entire area of the portion in the axial direction where the opening 20a in the cartridge body 20 is located. A portion 23 of the main body cylinder 21 formed in a film shape so as to cover the opening 20a of the core cylinder 20 (hereinafter referred to as a diaphragm) is formed to be elastically deformable in the radial direction. The diaphragm 23 may be independent from the inner attachment member 12.

Two spiral grooves 21b, 21c extending spirally about the center axis O are formed on the outer peripheral surface of the main body tube 21. As shown in fig. 1, the upper ends of the two spiral grooves 21b and 21c are located on both sides of the outer peripheral surface of the main body tube 21 with the center axis O interposed therebetween in the radial direction. The axial positions of the respective upper ends of the two spiral grooves 21b, 21c are identical to each other. The lower ends of the two spiral grooves 21b and 21c are located on both sides of the outer peripheral surface of the main body tube 21 with the center axis O interposed therebetween in the radial direction. The axial positions of the lower ends of the two spiral grooves 21b and 21c are the same, and the spiral grooves are opened at the upper end of the annular groove 21 a. The circumferential directions of the two spiral grooves 21b, 21c from the upper end toward the lower end are the same as each other. The two spiral grooves 21b, 21c are equal to each other in length, width, and lead angle. In the illustrated example, the two spiral grooves 21b and 21c are wound around the central axis O by 360 ° or more, but may be wound around less than 360 °.

The outer cylinder 22 integrally covers the annular groove 21a and the spiral grooves 21b and 21c of the main body cylinder 21 from the outside in the radial direction. The outer cylinder 22 has two through holes 22a communicating with the upper ends of the two spiral grooves 21b and 21 c.

The 1 st intermediate tube 24 and the 2 nd intermediate tube 25 are fitted to the respective axial ends of the outer fitting tube 22. The outer peripheral surface of the 1 st intermediate tube 24 positioned on the upper side of the 1 st intermediate tube 24 and the 2 nd intermediate tube 25 is opposed to the inner peripheral surface of the projecting tube portion 19b of the 3 rd outer member 19 in the radial direction. The 1 st intermediate tube 24 is externally fitted to a portion of the externally fitted tube 22 located above the through hole 22 a. The outer peripheral surface of the 2 nd intermediate cylinder 25 located on the lower side of the 1 st intermediate cylinder 24 and the 2 nd intermediate cylinder 25 is radially opposed to the 2 nd outer member 18.

The inner attachment member 12 may be integrally formed as a whole, or may be appropriately modified.

The upper 1 st main body rubber 13a located on the upper side of the pair of 1 st main body rubbers 13a, 13b is formed in a ring shape extending gradually downward from the inside toward the outside in the radial direction. The radial inner end portion of the upper 1 st main rubber 13a is vulcanization-bonded to the outer peripheral surface of the 1 st intermediate tube 24, and the radial outer end portion is vulcanization-bonded to the inner peripheral surface of the projecting tube portion 19b of the 3 rd outer member 19. In the illustrated example, the upper 1 st main body rubber 13a is coupled to the inner attachment member 12 via the 1 st intermediate tube 24.

The lower-side 1 st main body rubber 13b located on the lower side of the pair of 1 st main body rubbers 13a and 13b is formed in a ring shape that gradually extends downward from the inside toward the outside in the radial direction. The radial inner end portion of the lower 1 st main rubber 13b is vulcanization bonded to the outer peripheral surface of the 2 nd intermediate tube 25, and the radial outer end portion is vulcanization bonded to the inner peripheral portion of the 2 nd outer member 18. In the illustrated example, the lower 1 st main body rubber 13b is coupled to the inner attachment member 12 via the 2 nd intermediate tube 25.

Further, the 1 st body rubbers 13a and 13b may be directly coupled to the inner attachment member 12.

The partition member 15 is annular and disposed in the liquid chamber 14. The partition member 15 partitions the liquid chamber 14 into the 1 st liquid chamber 26 and the 2 nd liquid chamber 27 in the axial direction. Of the 1 st liquid chamber 26 and the 2 nd liquid chamber 27, the volume of the 1 st liquid chamber 26 located on the upper side is larger than the volume of the 2 nd liquid chamber 27 located on the lower side. The configuration is not limited to this, and for example, the volume of the 1 st liquid chamber 26 may be equal to or less than the volume of the 2 nd liquid chamber 27.

The outer peripheral surface of the partition member 15 is coupled to the inner peripheral surface of the outer attachment member 11, and the inner peripheral surface of the partition member 15 is coupled to the outer peripheral surface of the inner attachment member 12. The partition member 15 includes an annular elastic portion 15a having a radial outer end portion coupled to the outer attachment member 11, and a rigid portion 15b having a radial inner end portion coupled to the inner attachment member 12. The elastic portion 15a is formed of, for example, a rubber material having a lower hardness than the rigid portion 15 b. The radially inner end of the elastic portion 15a and the radially outer end of the rigid body portion 15b are connected to each other. The elastic portion 15a is vulcanization bonded to the inner peripheral surface of the main tubular body 16 of the outer attachment member 11 and the radially outer end portion of the rigid body portion 15b, and the rigid body portion 15b is externally fitted to the outer fitting tube 22 of the inner attachment member 12. The elastic portion 15a extends gradually downward from the radially inner side toward the radially outer side. A stepped portion formed on the outer peripheral surface of the outer fitting tube 22 abuts on the upper surface of the radially inner end portion of the rigid body portion 15 b. The radial inner end portion of the lower-side 1 st main rubber 13b abuts against the lower surface of the radial inner end portion of the rigid body portion 15 b.

A 2 nd main body rubber 30 is included, and the 2 nd main body rubber 30 divides the 1 st liquid chamber 26 into a 3 rd liquid chamber 28 having the upper 1 st main body rubber 13a as a part of the partition wall and a 4 th liquid chamber 29 having the partition member 15 as a part of the partition wall. The 2 nd main body rubber 30 partitions the 1 st liquid chamber 26 in the axial direction. The volumes of the 3 rd liquid chamber 28, the 4 th liquid chamber 29, and the 2 nd liquid chamber 27 are equal to each other.

Instead of this structure, for example, the volumes of the 3 rd liquid chamber 28, the 4 th liquid chamber 29, and the 2 nd liquid chamber 27 may be different from each other. Further, the 2 nd liquid chamber 27 may be divided into the 3 rd liquid chamber in which the lower 1 st main body rubber 13b is a part of the partition wall and the 4 th liquid chamber in which the partition member 15 is a part of the partition wall by the 2 nd main body rubber 30.

The 2 nd main rubber 30 is annular and connects the outer attachment member 11 and the inner attachment member 12. The 2 nd main rubber 30 has a radially outer end portion vulcanized and bonded to the fitting cylindrical portion 17b of the 1 st outer member 17, and a radially inner end portion vulcanized and bonded to the outer fitting cylinder 22 of the inner attachment member 12. The 2 nd main rubber 30 gradually extends downward from the inside toward the outside in the radial direction. The axial gaps are provided between the radial inner end portion of the 2 nd main body rubber 30 and the radial inner end portions of the upper 1 st main body rubber 13a and the respective lower end portions of the 1 st intermediate tube 24, and a part of the outer peripheral surface of the outer tube 22 of the inner attachment member 12 is exposed to the 3 rd liquid chamber 28 through the gaps. The aforementioned through-hole 22a is formed in a portion of the outer peripheral surface of the outer tube 22 exposed to the 3 rd liquid chamber 28.

Further, in the present embodiment, any two of the 2 nd liquid chamber 27, the 3 rd liquid chamber 28, and the 4 th liquid chamber 29 communicate with each other through the 1 st limiting passage 31 formed in the outer mounting member 11, the inner mounting member 12, or the partition member 15, and the remaining one liquid chamber communicates with the 5 th liquid chamber 32 formed in the outer mounting member 11, the inner mounting member 12, or the partition member 15.

In the illustrated example, the 1 st limiting passage 31 is formed in the rigid body portion 15b of the partition member 15, and communicates the 4 th liquid chamber 29 and the 2 nd liquid chamber 27. The 4 th liquid chamber 29 and the 2 nd liquid chamber 27 each form an annular space extending continuously over the entire circumference. The 1 st limiting path 31 may be formed in the outer attachment member 11 or the inner attachment member 12, and may communicate the 4 th liquid chamber 29 with the 3 rd liquid chamber 28 or communicate the 3 rd liquid chamber 28 with the 2 nd liquid chamber 27.

The 5 th liquid chamber 32 is formed in the inner mount member 12. The 5 th liquid chamber 32 is partitioned by an annular groove 21a formed in the outer peripheral surface of the main body tube 21 being covered with the outer tube 22, and has a diaphragm 23 in a part of a partition wall. The 5 th liquid chamber 32 is an annular space formed between the main body tube 21 and the outer tube 22 and continuously extending over the entire circumference. As the liquid flows into the 5 th liquid chamber 32 and the liquid flows out from the 5 th liquid chamber 32, the diaphragm 23 is deformed in an expanding and contracting manner. In addition, the 5 th liquid chamber 32 may be formed in the outer attachment member 11 or the partition member 15.

The 3 rd liquid chamber 28 is divided in the circumferential direction, and these divided liquid chambers 28a, 28b divided in the circumferential direction and the 5 th liquid chamber 32 communicate with each other through the 2 nd limiting passage 33 formed in the outer mounting member 11, the inner mounting member 12, or the partition member 15, respectively.

As described above, the 1 st limiting path 31, the 4 th liquid chamber 29, and the 2 nd liquid chamber 27, the 2 nd limiting path 33, and the divided liquid chambers 28a and 28b, and the 5 th liquid chamber 32 are independent from each other so as not to communicate with each other.

In the illustrated example, the 2 nd restricting passage 33 is formed in the inner mounting member 12. The 2 nd restricting passage 33 is constituted by the spiral grooves 21b and 21c covered by the outer cylinder 22 and the through hole 22a formed in the outer cylinder 22. Two 2 nd limiting passages 33 are provided.

According to the above, the 2 nd limiting path 33 and the 5 th liquid chamber 32 are formed in the same member among the outer mounting member 11, the inner mounting member 12, and the partition member 15, and the aforementioned 1 st limiting path 31 is formed in a member different from the member in which the 2 nd limiting path 33 and the 5 th liquid chamber 32 are formed among the outer mounting member 11, the inner mounting member 12, and the partition member 15.

The 2 nd limiting path 33 may be formed in the outer mounting member 11 or the partition member 15, or may be formed in a member different from the member in which the 5 th liquid chamber 32 is formed, among the outer mounting member 11, the inner mounting member 12, and the partition member 15. Further, the 1 st limiting path 31 may also be formed in the same member as the member in which the 2 nd limiting path 33 and the 5 th liquid chamber 32 are formed, of the outer mounting member 11, the inner mounting member 12, and the partition member 15.

As shown in fig. 2, the 3 rd liquid chamber 28 is divided into two divided liquid chambers 28a, 28b in the circumferential direction by an elastic dividing member 34. The elastic dividing member 34 is formed of, for example, a rubber material, and connects portions of the inner circumferential surface of the outer mounting member 11 that face each other in the radial direction so as to straddle the inner mounting member 12 in the radial direction. The elastic dividing members 34 extend in the radial direction and are arranged on the same straight line when viewed from the axial direction. The divided liquid chambers 28a and 28b have the same size. The divided liquid chambers 28a and 28b have symmetrical shapes with respect to the straight line in a cross-sectional view orthogonal to the central axis O. The elastic dividing member 34 is formed integrally with the upper 1 st main body rubber 13 a. In addition, the elastic dividing member 34 may be formed integrally with the 2 nd main rubber 30.

The 2 nd limiting path 33 communicates the two divided liquid chambers 28a, 28b and the one 5 th liquid chamber 32, respectively. The flow resistances of the two 2 nd limiting passages 33 may be equal to or different from each other.

In the illustrated example, the flow path cross-sectional area of the 1 st limiting passage 31 is larger than the flow path cross-sectional area of the 2 nd limiting passage 33. The 1 st limiting passage 31 has a shorter flow path length than the 2 nd limiting passage 33. Further, the flow resistance of the 1 st limiting passage 31 is smaller than the flow resistance of the 2 nd limiting passage 33.

The flow path cross-sectional area of the 1 st limiting passage 31 may be equal to or less than the flow path cross-sectional area of the 2 nd limiting passage 33, the flow path length of the 1 st limiting passage 31 may be equal to or more than the flow path length of the 2 nd limiting passage 33, or the flow resistance of the 1 st limiting passage 31 may be equal to or more than the flow resistance of the 2 nd limiting passage 33.

Next, the operation of the vibration damping device 10 will be described.

When the vibration in the axial direction is input, either one of the 1 st liquid chamber 26 and the 2 nd liquid chamber 27 is compressively deformed, while the other is extensionally deformed. At this time, the pair of 1 st body rubbers 13a, 13b, the 2 nd body rubber 30, the elastic dividing member 34, and the elastic portion 15a of the partition member 15 are elastically deformed, respectively.

Thus, the liquid flows through the 1 st limiting path 31 between the 4 th liquid chamber 29 and the 2 nd liquid chamber 27, while the liquid flows through the two 2 nd limiting paths 33 between the divided liquid chambers 28a and 28b of the 3 rd liquid chamber 28 and the 5 th liquid chamber 32. Therefore, liquid column resonance occurs in the 1 st limiting passage 31 and the 2 nd limiting passage 33, and vibration is damped and absorbed. In this case, when the resonance frequencies of the 1 st limiting path 31 and the 2 nd limiting path 33 are different from each other, the attenuation characteristic can be exhibited in a wide frequency band.

When vibration is applied in a lateral direction intersecting the axial direction, one of the divided liquid chambers 28a and 28b of the 3 rd liquid chamber 28 is compressed and deformed, while the other is expanded and deformed.

thereby, the liquid flows from either one of the two divided liquid chambers 28a, 28b toward the 5 th liquid chamber 32 via either one of the two 2 nd limiting paths 33, and the liquid flows from the 5 th liquid chamber 32 toward either one of the two divided liquid chambers 28a, 28b via either the other of the two 2 nd limiting paths 33. Therefore, liquid column resonance occurs in the two 2 nd limiting passages 33, and vibration is damped and absorbed.

as described above, according to the vibration damping device 10 of the present embodiment, the common liquid chamber can be eliminated from the 4 th liquid chamber 29 and the 2 nd liquid chamber 27 which communicate with each other through the 1 st limiting passage 31 and the divided liquid chambers 28a, 28b and the 5 th liquid chamber 32 which communicate with each other through the 2 nd limiting passage 33, and the 1 st limiting passage 31, the 4 th liquid chamber 29 and the 2 nd liquid chamber 27 can be made to communicate with the 2 nd limiting passage 33, and the divided liquid chambers 28a, 28b and the 5 th liquid chamber 32 are independent from each other. Therefore, when vibration is input, it is possible to avoid a situation in which the liquid that flows between the 4 th liquid chamber 29 and the 2 nd liquid chamber 27 via the 1 st limiting passage 31 flows into the 2 nd limiting passage 33, or the liquid that flows between the divided liquid chambers 28a and 28b via the 2 nd limiting passage 33 and the 5 th liquid chamber 32 flows into the 1 st limiting passage 31, and it is possible to ensure a damping force both when vibration in the axial direction is input and when vibration in the lateral direction is input.

Since the 5 th liquid chamber 32, which is one of the 4 liquid chambers 27, 28, 29, 32 included in the vibration damping device 10, is formed in one of the outer mounting member 11, the inner mounting member 12, and the partition member 15, which are conventional members, it is possible to realize a structure in which the 1 st limiting passage 31, the 4 th liquid chamber 29, the 2 nd liquid chamber 27, and the 2 nd limiting passage 33, and the respective divided liquid chambers 28a, 28b, and the 5 th liquid chamber 32 are independent of each other while suppressing an increase in volume and an increase in the number of components of the vibration damping device 10.

since the 5 th liquid chamber 32 formed in one of the outer mounting member 11, the inner mounting member 12, and the partition member 15 communicates with each of the divided liquid chambers 28a and 28b divided in the circumferential direction via the 2 nd limiting passage 33, the vibration damping device 10 that achieves the above-described operational effects can be easily and reliably realized while suppressing the internal volume of the 5 th liquid chamber 32 required to exhibit desired vibration damping performance to a small extent, suppressing design changes of existing members.

Since the partition member 15 is interposed between the 4 th liquid chamber 29 and the 2 nd liquid chamber 27, which communicate with the 1 st limiting passage 31, a large hydraulic pressure difference can be generated between the 4 th liquid chamber 29 and the 2 nd liquid chamber 27 when the vibration in the axial direction is input, and a high damping force can be reliably generated.

Since the 2 nd limiting passage 33 and the 5 th liquid chamber 32, which communicate with each other, are formed in the same member among the outer mounting member 11, the inner mounting member 12, and the partition member 15, it is possible to suppress an increase in volume and complication of the vibration damping device 10. Further, since the 1 st limiting path 31 is formed in a member different from the member in which the 2 nd limiting path 33 and the 5 th liquid chamber 32 are formed among the outer mounting member 11, the inner mounting member 12, and the partition member 15, complication of the vibration damping device 10 can be reliably suppressed.

Since a part of the partition wall of the 5 th liquid chamber 32 communicating with the divided liquid chambers 28a and 28b via the 2 nd limiting passage 33 is the diaphragm 23, when the lateral vibration is input, the hydraulic pressure of the divided liquid chambers 28a and 28b varies, while the hydraulic pressure of the 5 th liquid chamber 32 communicating with both the divided liquid chambers 28a and 28b does not vary. Therefore, it is possible to suppress a situation in which the damping force generated when the lateral vibration is input excessively increases, and it is possible to improve, for example, the riding comfort when the lateral vibration is input.

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

For example, in the above-described embodiment, the partition member 15 has been described as including the elastic portion 15a and the rigid portion 15b, but the present invention is not limited to this configuration, and for example, a configuration including only a rigid portion may be adopted.

In the above embodiment, the vibration damping device 10 is divided into three liquid chambers, i.e., the 2 nd liquid chamber 27, the 3 rd liquid chamber 28, and the 4 th liquid chamber 29 in the axial direction, but the present invention is also applicable to a configuration divided into 4 or more liquid chambers in the axial direction.

In the above embodiment, the 3 rd liquid chamber 28 is divided into two in the circumferential direction and includes the two 2 nd limiting passages 33, but the present invention is also applicable to a configuration in which the 3 rd liquid chamber 28 is divided into 3 or more in the circumferential direction and includes 3 or more 2 nd limiting passages 33.

In the above embodiment, the 3 rd liquid chamber 28 is divided into two in the circumferential direction, and the circumferentially divided liquid chambers and the 5 th liquid chamber 32 are communicated with each other through the 2 nd limiting path 33, but the 2 nd liquid chamber 27 or the 4 th liquid chamber 29 may be divided in the circumferential direction, and the circumferentially divided liquid chambers and the 5 th liquid chamber 32 may be communicated with each other through the 2 nd limiting path 33.

In the above embodiment, the structure in which the diaphragm 23 is partially provided on the partition wall of the 5 th liquid chamber 32 is shown, but a structure in which the diaphragm 23 is not provided may be employed.

The vibration damping device 10 is not limited to the vehicle cabin mount, and may be applied to other than the vehicle cabin mount. For example, the present invention may be applied to an engine mount for a vehicle, a bush, a mount for a generator mounted on a construction machine, or a mount for a machine installed in a factory or the like.

In addition, the components of the embodiment can be replaced with well-known components as appropriate within the scope not departing from the gist of the present invention, and the above-described modifications can be combined as appropriate.

According to the present invention, when the vibration in the axial direction is input, the vibration is damped and absorbed by causing the liquid to flow between the two liquid chambers via the 1 st limiting passage and between the remaining one liquid chamber and the 5 th liquid chamber via the 2 nd limiting passage.

When vibration in the lateral direction intersecting the axial direction is input, since the remaining one liquid chamber is divided in the circumferential direction, the vibration is damped and absorbed by causing liquid to flow between these respective liquid chambers (hereinafter referred to as divided liquid chambers) via the 2 nd limiting passage and the 5 th liquid chamber.

The common liquid chamber can be eliminated from the two liquid chambers communicating with each other via the 1 st limiting path and the divided liquid chambers and the 5 th liquid chamber communicating with each other via the 2 nd limiting path, respectively, so that the 1 st limiting path and the two liquid chambers are not communicated with the 2 nd limiting path, the divided liquid chambers, and the 5 th liquid chamber and are independent from each other. Therefore, when vibration is input, it is possible to avoid a situation in which the liquid flowing between the two liquid chambers via the 1 st limiting passage flows into the 2 nd limiting passage, or the liquid flowing between the divided liquid chambers via the 2 nd limiting passage and the 5 th liquid chamber flows into the 1 st limiting passage, and it is possible to ensure a damping force both when vibration in the axial direction and when vibration in the lateral direction is input.

Since the 5 th liquid chamber, which is one of the 4 liquid chambers provided in the vibration damping device, is formed in one of the outer attachment member, the inner attachment member, and the partition member, which are conventional members, the 1 st limiting path and the two liquid chambers, and the 2 nd limiting path, and the divided liquid chambers, and the 5 th liquid chamber can be configured independently of each other while suppressing an increase in the volume and the number of components of the vibration damping device.

since the 5 th liquid chamber formed in one of the outer mounting member, the inner mounting member, and the partition member is communicated with each of the divided liquid chambers divided in the circumferential direction via the 2 nd limiting passage, the internal volume of the 5 th liquid chamber required to exhibit a desired vibration damping performance can be suppressed to be small, and the vibration damping device which achieves the above-described operational effects can be easily and reliably realized while suppressing design changes of existing members.

Here, the 1 st limiting passage may communicate the 3 rd liquid chamber with the 2 nd liquid chamber or the 4 th liquid chamber with the 2 nd liquid chamber.

In this case, the partition member is interposed between the 3 rd liquid chamber or the 4 th liquid chamber and the 2 nd liquid chamber, which are communicated with the 1 st limiting passage, and when the vibration in the axial direction is input, a large hydraulic pressure difference can be generated between the 3 rd liquid chamber or the 4 th liquid chamber and the 2 nd liquid chamber, and a high damping force can be reliably generated.

Further, the 2 nd limiting path and the 5 th liquid chamber may be formed in the same member among the outer mounting member, the inner mounting member, and the partition member, and the 1 st limiting path may be formed in a member different from the member in which the 2 nd limiting path and the 5 th liquid chamber are formed among the outer mounting member, the inner mounting member, and the partition member.

In this case, since the 2 nd limiting path and the 5 th liquid chamber, which communicate with each other, are formed in the same member of the outer mounting member, the inner mounting member, and the partition member, it is possible to suppress an increase in volume and complication of the vibration damping device. Further, since the 1 st limiting path is formed in a member different from the member in which the 2 nd limiting path and the 5 th liquid chamber are formed among the outer mounting member, the inner mounting member, and the partition member, complication of the vibration damping device can be reliably suppressed.

further, the liquid chamber may include a diaphragm forming a part of a partition wall of the 5 th liquid chamber.

In this case, since a part of the partition wall of the 5 th liquid chamber communicating with each of the divided liquid chambers via the 2 nd limiting passage serves as a diaphragm, the hydraulic pressure in each of the divided liquid chambers fluctuates when lateral vibration is input. On the other hand, the hydraulic pressure in the 5 th liquid chamber, in which each of the divided liquid chambers communicates, does not vary. Therefore, it is possible to suppress a situation in which the damping force generated when the lateral vibration is input excessively increases, and it is possible to improve, for example, the riding comfort when the lateral vibration is input.

Industrial applicability

According to the present invention, a damping force can be ensured against each of the vibrations in the axial direction and the lateral direction.

Description of the reference numerals

10. A vibration isolation device; 11. an outer mounting member; 12. an inner mounting member; 13a, 13b, 1 st main body rubber; 14. a liquid chamber; 15. a partition member; 23. a diaphragm; 27. a 2 nd liquid chamber; 28. a 3 rd liquid chamber; 29. a 4 th liquid chamber; 30. 2 nd main body rubber; 31. a 1 st restricted pathway; 32. a 5 th liquid chamber; 33. a 2 nd restricted pathway; o, central axis.