JP6830362B2 - Anti-vibration device - Google Patents

Description

The present invention relates to a vibration isolator.

Conventionally, for example, as shown in Patent Document 1 below, a tubular outer mounting member connected to one of a vibration generating portion and a vibration receiving portion, and a tubular outer mounting member connected to the other and an outer mounting member. A pair of first elastic bodies arranged at intervals in the axial direction along the central axis of the outer mounting member while connecting the inner mounting member arranged on the inner side, the outer mounting member and the inner mounting member, and the outer side. A partition member that connects the mounting member and the inner mounting member and divides the liquid chamber between the pair of first elastic bodies into a plurality of liquid chambers in the axial direction, and further partitions the liquid chambers in the axial direction. A vibration isolator including a second elastic body is known.

Japanese Unexamined Patent Publication No. 8-4824

However, the conventional vibration isolator has a problem that it cannot attenuate and absorb the vibration in the lateral direction intersecting the axial direction.

The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a vibration isolator capable of attenuating and absorbing axial vibrations and lateral vibrations intersecting the axial directions.

In order to solve the above-mentioned problems, the vibration isolator of the present invention is connected to a tubular outer mounting member connected to one of a vibration generating portion and a vibration receiving portion, and to the other, and is connected to the outer side. A pair of a pair of inner mounting members arranged inside the mounting member, connecting the outer mounting member and the inner mounting member, and arranged at intervals in the axial direction along the central axis of the outer mounting member. 1 A partition that connects the main body rubber, the outer mounting member, and the inner mounting member, and partitions the liquid chamber between the pair of the first main body rubbers into a first liquid chamber and a second liquid chamber in the axial direction. The member, the first elastic division member that divides the first liquid chamber in the circumferential direction and defines the first liquid chamber, and the second liquid chamber which is divided in the circumferential direction into two divisions. A second elastic dividing member defining a liquid chamber is provided, and the first elastic dividing member and the second elastic dividing member are respectively arranged at equivalent circumferential positions, and are arranged in the partition member. It is characterized in that a first limiting passage and a second limiting passage are formed which separately communicate the divided first liquid chamber and the divided second liquid chamber, which are located at different positions in the circumferential direction.

According to the present invention, when axial vibration is input, the first main body rubber, the second main body rubber, the third main body rubber, the first elastic dividing member, and the second elastic dividing member are elastically deformed, and the first The hydraulic pressures of the 1st liquid chamber and the 2nd liquid chamber try to fluctuate. At this time, the liquid separately flows between the two divided first liquid chambers of the first liquid chamber and the two divided second liquid chambers of the second liquid chamber through the first restricted passage and the second restricted passage. By doing so, the vibration in the axial direction is attenuated and absorbed.

Further, since the divided first liquid chamber and the divided second liquid chamber, which are arranged in different positions in the circumferential direction, are communicated separately by the first limiting passage and the second limiting passage, they intersect in the axial direction. When the vibration in the lateral direction is input, the rubbers of the first to third main bodies and the first and second elastic dividing members are elastically deformed as described above, and the divided first liquid chamber and the divided second liquid chamber are respectively. The hydraulic pressure tries to fluctuate. At this time, the liquids are laterally moved between the divided first liquid chamber and the divided second liquid chamber, which are arranged in different positions in the circumferential direction, through the first limiting passage and the second limiting passage. Directional vibration is damped and absorbed.

Further, for example, if the resonance frequencies of the first limiting passage and the second limiting passage are made equal to each other, high damping performance can be exhibited against vibration of a specific frequency. On the other hand, for example, if the resonance frequencies of the first limiting passage and the second limiting passage are different, two resonance frequencies exist, and the damping characteristics based on the liquid column resonance in each of the first limiting passage and the second limiting passage. It is possible to level the peaks of the above, reduce the dynamic spring in a wide frequency band, and suppress the increase in spring at the time of input of vibration.

Further, the second main body rubber that partitions the first liquid chamber into a first pressure receiving liquid chamber in which the first main body rubber is a part of the partition wall and a second pressure receiving liquid chamber in which the partition member is a part of the partition wall. The second liquid chamber is divided into a third pressure receiving liquid chamber in which the first main body rubber is a part of the partition wall, and a third main body rubber in which the partition member is a part of the partition wall. The first elastic dividing member comprises, and at least one of the first pressure receiving liquid chamber and the second pressure receiving liquid chamber is partitioned in the circumferential direction, and the second elastic dividing member comprises the third pressure receiving liquid chamber. At least one of the liquid chamber and the fourth pressure receiving liquid chamber may be partitioned in the circumferential direction.

In this case, all the liquid chambers partitioned into the first liquid chamber and the second liquid chamber have at least one of the first main body rubber, the second main body rubber, and the third main body rubber as a part of the partition wall. Since it is a pressure-receiving liquid chamber in which the hydraulic pressure fluctuates with the input of vibration, the amount of fluctuation of the hydraulic pressure at the time of input of vibration becomes large, and it is high with respect to axial and lateral vibration. The damping performance can be exhibited.

Further, the first elastic dividing member partitions the first pressure receiving liquid chamber in the circumferential direction, and the second elastic dividing member partitions the third pressure receiving liquid chamber in the circumferential direction, and the partition member has a partition member. , A third limiting passage connecting the second pressure receiving liquid chamber and the fourth pressure receiving liquid chamber may be formed.
In this case, the first limiting passage and the second limiting passage are defined in the first pressure receiving liquid chamber and the third pressure receiving liquid chamber located outside in the axial direction among the first to fourth pressure receiving liquid chambers. The divided first liquid chamber and the divided second liquid chamber are communicated with each other separately, and the third limiting passage is the second pressure receiving liquid chamber and the fourth of the first to fourth pressure receiving liquid chambers located inside in the axial direction. Since it communicates with the pressure receiving liquid chamber, it is not necessary to intersect the first restricted passage, the second restricted passage, and the third restricted passage with each other, and the first restricted passage, the second restricted passage, and the third restricted passage are not required. Restricted passages can be easily formed.

Further, among the first to fourth pressure receiving liquid chambers, the first pressure receiving liquid chamber and the third pressure receiving liquid chamber located outside in the axial direction are divided into the divided first liquid chamber and the divided second liquid chamber. Compared with a configuration in which these divided first liquid chambers and divided second liquid chambers are partitioned into a second pressure receiving liquid chamber and a fourth pressure receiving liquid chamber located inside in the axial direction, at least the divided first liquid chamber is used. It becomes easy to secure the distance between the liquid chamber and the divided second liquid chamber, and the flow path lengths of the first limiting passage and the second limiting passage can be easily secured.

Further, the partition member includes a rigid body portion in which the first limiting passage and the second limiting passage are formed, and an annular elastic portion connected to the rigid body portion in the radial direction orthogonal to the central axis. The rigid body portion has an outer rigid body portion connected to the outer mounting member and an inner rigid body portion connected to the inner mounting member, and the elastic portion includes the outer rigid body portion and the inner rigid body portion. May be concatenated.
In this case, since the elastic portion of the partition member connects the outer rigid body portion and the inner rigid body portion, for example, when the partition member is assembled to the outer mounting member and the inner mounting member, the elastic portion is deformed. As a result, it becomes possible to easily assemble, and it is possible to easily improve the assembleability.

According to the present invention, it is possible to attenuate and absorb axial vibrations and lateral vibrations intersecting the axial directions.

It is a vertical sectional view of the vibration isolation device which concerns on one Embodiment of this invention. FIG. 2 is a cross-sectional view taken along the line II-II of the vibration isolator shown in FIG. It is a schematic diagram which shows the communication state of the division 1st liquid chamber and the division 2nd liquid chamber, and 1st restriction passage and 2nd restriction passage in the vibration isolation device shown in FIG.

Hereinafter, the vibration isolator 10 according to the embodiment of the present invention will be described with reference to the drawings.
As shown in FIGS. 1 to 3, the vibration isolator 10 is a so-called liquid-filled type in which a liquid (for example, ethylene glycol, water, silicone oil, etc.) is sealed inside. The vibration isolator 10 can be suitably applied to, for example, a cabin mount.

As shown in FIG. 1, the vibration isolator 10 includes a tubular outer mounting member 11, an inner mounting member 12, a pair of first main body rubber 13, and a partition member 16.
The vibration isolator 10 is arranged between a vibration generating portion and a vibration receiving portion (not shown), the outer mounting member 11 is connected to either the vibration generating portion or the vibration receiving portion, and the inner mounting member 12 vibrates. It is connected to either the generating part or the vibration receiving part.
In the following description, the direction along the central axis O of the outer mounting member 11 is referred to as the axial direction, the central portion side of the outer mounting member 11 along the axial direction is referred to as the inner side in the axial direction, and the opening side of the outer mounting member 11 is referred to. Is called the outside in the axial direction. Further, in a plan view from the axial direction, the direction orthogonal to the central axis O is referred to as the radial direction, and the direction orbiting around the central axis O is referred to as the circumferential direction.

The diameter of the outer mounting member 11 is reduced in the inner portion in the axial direction. An intermediate cylinder member 21 is fitted inside the outer mounting member 11. A pair of intermediate cylinder members 21 are arranged at intervals in the axial direction.
The intermediate cylinder member 21 includes a large-diameter cylinder portion 21B fitted in the outer end portion in the axial direction of the outer mounting member 11 and a small-diameter cylinder portion 21A arranged inside the large-diameter cylinder portion 21B in the axial direction. I have. An inner flange portion 21C that projects outward in the radial direction is formed at the outer end portion in the axial direction of the small diameter tubular portion 21A.
The outer peripheral surface of the small diameter tubular portion 21A faces the inner peripheral surface of the outer mounting member 11 with a gap in the radial direction.

A fixed flange portion 21D is formed at the outer end portion of the large-diameter tubular portion 21B in the axial direction so as to project outward in the radial direction and be fixed to the outer mounting member 11.
Bent portions 11A that are bent inward in the radial direction are formed at both ends of the outer mounting member 11 in the axial direction. The intermediate cylinder member 21 is fixed to the outer mounting member 11 by covering the outer end portion of the fixed flange portion 21D of the intermediate cylinder member 21 in the radial direction from the outside in the axial direction by the bent portion 11A.

The inner mounting member 12 is arranged inside the outer mounting member 11 in the radial direction. The inner mounting member 12 has a tubular shape and is arranged coaxially with the central axis O. Further, the positions of the central portions in the axial direction of the outer mounting member 11 and the inner mounting member 12 are the same as each other.
Both ends of the inner mounting member 12 in the axial direction project outward from the outer mounting member 11 in the axial direction, respectively. Mounting flange portions 12A projecting outward in the radial direction are separately formed at both ends of the inner mounting member 12 in the axial direction.

The pair of first main body rubber 13s connect the outer mounting member 11 and the inner mounting member 12, and are arranged at intervals in the axial direction. The first main body rubber 13 is connected to the outer mounting member 11 via the intermediate cylinder member 21.
The first main body rubber 13 has an annular shape. The first main body rubber 13 gradually extends inward in the axial direction as it goes outward in the radial direction.
The radial outer end of the first main body rubber 13 is vulcanized and adhered to the inner peripheral surface of the large diameter tubular portion 21B of the intermediate tubular member 21, and the radial inner end of the first main body rubber 13 is attached inside. It is vulcanized and adhered to the outer peripheral surface of the member 12.

The liquid chamber 30 is a space surrounded by an outer mounting member 11, an inner mounting member 12, and a pair of first main body rubber 13. In the illustrated example, the liquid chamber 30 is axially oriented on the inner peripheral surface of the intermediate cylinder member 21 fitted in the outer mounting member 11, the outer peripheral surface of the inner mounting member 12, and the pair of first main body rubbers 13. It is a space surrounded by an inner surface that faces inward.

The partition member 16 connects the outer mounting member 11 and the inner mounting member 12, and partitions the liquid chamber 30 into a first liquid chamber 31 and a second liquid chamber 32 in the axial direction. The partition member 16 has an annular shape and is arranged at the central portion in the axial direction of the liquid chamber 30. The outer peripheral surface of the partition member 16 is connected to the inner peripheral surface of the outer mounting member 11, and the inner peripheral surface of the partition member 16 is connected to the outer peripheral surface of the inner mounting member 12. The outer rigid body portion 16A of the partition member 16, which will be described later, is arranged in an axial gap between the pair of intermediate cylinder members 21.
The volumes of the first liquid chamber 31 and the volume of the second liquid chamber 32 are equal to each other. The volumes of the first liquid chamber 31 and the second liquid chamber 32 may be different from each other.

As shown in FIG. 1, the vibration isolator 10 has a first liquid chamber 31, a first pressure receiving liquid chamber 41 having the first main body rubber 13 as a part of the partition wall, and a partition member 16 as a part of the partition wall. The second main body rubber 14 partitioned into the second pressure receiving liquid chamber 42, the second liquid chamber 32, the third pressure receiving liquid chamber 43 in which the first main body rubber 13 is a part of the partition wall, and the partition member 16 are one of the partition walls. It is provided with a third main body rubber 15 for partitioning into a fourth pressure receiving liquid chamber 44 as a part.

The second main body rubber 14 and the third main body rubber 15 form an annular shape. The second main body rubber 14 and the third main body rubber 15 gradually extend inward in the axial direction toward the outside in the radial direction. The radial outer ends of the second main body rubber 14 and the third main body rubber 15 are vulcanized and adhered to the inner peripheral surface of the small diameter tubular portion 21A of the intermediate tubular member 21, and the second main body rubber 14 and the third main body rubber are bonded. Each radial inner end portion of No. 15 is vulcanized and bonded to the outer peripheral surface of the inner mounting member 12.

The first pressure receiving liquid chamber 41 is a space surrounded by an outer mounting member 11, an inner mounting member 12, a first main body rubber 13, and a second main body rubber 14. In the illustrated example, the first pressure receiving liquid chamber 41 is the inner peripheral surface of the intermediate cylinder member 21 fitted to the outer mounting member 11, the inner surface of the first main body rubber 13 facing inward in the axial direction, and the inner mounting member 12. It is a space surrounded by an outer peripheral surface and an outer surface of the second main body rubber 14 facing outward in the axial direction.

The second pressure receiving liquid chamber 42 is a space surrounded by the inner mounting member 12, the partition member 16, and the second main body rubber 14 as partition walls. In the illustrated example, the second pressure receiving liquid chamber 42 is surrounded by the outer peripheral surface of the inner mounting member 12, the outer surface of the partition member 16 facing outward in the axial direction, and the inner surface of the second main body rubber 14 facing inward in the axial direction. It is a space.

The third pressure receiving liquid chamber 43 is a space surrounded by an outer mounting member 11, an inner mounting member 12, a first main body rubber 13, and a third main body rubber 15. In the illustrated example, the third pressure receiving liquid chamber 43 is the inner peripheral surface of the intermediate cylinder member 21 fitted to the outer mounting member 11, the inner surface of the first main body rubber 13 facing inward in the axial direction, and the inner mounting member 12. It is a space surrounded by an outer peripheral surface and an outer surface of the third main body rubber 15 facing outward in the axial direction.

The fourth pressure receiving liquid chamber 44 is a space surrounded by the inner mounting member 12, the partition member 16, and the third main body rubber 15 as partition walls. In the illustrated example, the fourth pressure receiving liquid chamber 44 is surrounded by an outer peripheral surface of the inner mounting member 12, an outer surface of the partition member 16 facing outward in the axial direction, and an inner surface of the third main body rubber 15 facing inward in the axial direction. It is a space.

The volumes of the second main body rubber 14 and the third main body rubber 15 are equal to each other, and are smaller than the volume of the first main body rubber 13.
The volumes of the first pressure receiving liquid chamber 41 and the third pressure receiving liquid chamber 43 are made equal to each other, and the volumes of the second pressure receiving liquid chamber 42 and the fourth pressure receiving liquid chamber 44 are made equal to each other. Further, the first pressure receiving liquid chamber 41 and the third pressure receiving liquid chamber 43 are smaller in axial size in the vertical cross-sectional view than the second pressure receiving liquid chamber 42 and the fourth pressure receiving liquid chamber 44. The volume of the first to third main body rubbers and the shape of the first to fourth pressure receiving liquid chambers are not limited to such an embodiment and can be arbitrarily changed.

Then, in the present embodiment, as shown in FIGS. 2 and 3, the vibration isolator 10 divides the first liquid chamber 31 in the circumferential direction and defines two divided first liquid chambers 31A and 31B. It includes one elastic dividing member 18A and a second elastic dividing member 18B that divides the second liquid chamber 32 in the circumferential direction and defines two divided second liquid chambers 32A and 32B.
Further, in the present embodiment, the first elastic dividing member 18A partitions at least one of the first pressure receiving liquid chamber 41 and the second pressure receiving liquid chamber 42 in the circumferential direction, and the second elastic dividing member 18B receives the third pressure. At least one of the liquid chamber 43 and the fourth pressure receiving liquid chamber 44 is partitioned in the circumferential direction. In the illustrated example, as shown in FIG. 3, the first elastic dividing member 18A partitions the first pressure receiving liquid chamber 41 in the circumferential direction and defines two divided first liquid chambers 31A and 31B, and the second The elastic dividing member 18B divides the third pressure receiving liquid chamber 43 in the circumferential direction and defines two divided second liquid chambers 32A and 32B.

The first elastic dividing member 18A and the second elastic dividing member 18B are respectively arranged at the same circumferential positions. As shown in FIG. 2, the first elastic dividing member 18A and the second elastic dividing member 18B each extend in the radial direction and are arranged on the same straight line in a plan view seen from the axial direction.
The first elastic dividing member 18A is integrally formed with either one of the first main body rubber 13 and the second main body rubber 14, and the second elastic dividing member 18B is formed of the first main body rubber 13 and the third main body rubber 15. It is integrally formed with one of the two. The first elastic dividing member 18A and the second elastic dividing member 18B are each formed to have the same size and the same shape.
The divided first liquid chambers 31A and 31B and the divided second liquid chambers 32A and 32B all have the same size. Of the divided first liquid chambers 31A and 31B and the divided second liquid chambers 32A and 32B, those having the same position in the circumferential direction are the same in shape.

As shown in FIGS. 1 and 3, the partition member 16 communicates the divided first liquid chambers 31A and 31B and the divided second liquid chambers 32A and 32B, which are arranged in different positions in the circumferential direction, separately. A first restricted passage 51A and a second restricted passage 51B are formed.
The first limiting passage 51A and the second limiting passage 51B are formed in a portion of the partition member 16 located outside in the radial direction. The first limiting passage 51A and the second limiting passage 51B are formed in the outer rigid body portion 16A of the partition member 16 described later.

The first restricted passage 51A and the second restricted passage 51B are arranged so as to be different from each other in the circumferential direction.
The flow path cross-sectional area, flow path length, and flow resistance of the first limiting passage 51A and the second limiting passage 51B are equal to each other.

Further, in the present embodiment, as shown in FIG. 1, the partition member 16 is formed with a third limiting passage 52 that communicates the second pressure receiving liquid chamber 42 and the fourth pressure receiving liquid chamber 44. The third limiting passage 52 is formed in a portion of the partition member 16 located inside the first limiting passage 51A and the second limiting passage 51B in the radial direction.
The flow resistances of the first restricted passage 51A and the second restricted passage 51B are equal to each other, and the flow resistances of the first restricted passage 51A and the third restricted passage 52 are different from each other. In the illustrated example, the flow path cross-sectional areas of the first restricted passage 51A, the second restricted passage 51B, and the third restricted passage 52 are equal to each other, and the flow path lengths of the first restricted passage 51A and the second restricted passage 51B are equal to each other. , And the flow path length of the third limiting passage 52 are different from each other.

Further, in the present embodiment, the partition member 16 includes a tubular outer rigid body portion 16A connected to the outer mounting member 11, an annular inner rigid body portion 16B connected to the inner mounting member 12, and an outer rigid body portion 16A and an inner side. It includes an annular elastic portion 16C that connects the rigid body portion 16B.
The positions of the central portions in the axial direction of the outer rigid body portion 16A and the inner rigid body portion 16B are equal to each other. The outer end portion of the outer rigid body portion 16A in the axial direction protrudes outward in the axial direction from the inner rigid body portion 16B.

The axial outer end of the outer rigid body portion 16A is fitted in a radial gap between the outer peripheral surface of the small diameter tubular portion 21A of the intermediate tubular member 21 and the inner peripheral surface of the outer mounting member 11. ..
The inner flange portion 21C of the small diameter tubular portion 21A is axially sandwiched by the axial inner end portion of the large diameter tubular portion 21B and the axial outer end portion of the outer rigid body portion 16A.
On the outer peripheral surface of the outer rigid body portion 16A, a flow path groove 16D extending from one side in the circumferential direction toward the other side gradually from one side in the axial direction toward the other side has different positions in the circumferential direction. A pair is formed. Each space surrounded by the pair of flow path grooves 16D and the inner peripheral surface of the outer mounting member 11 is defined as a first limiting passage 51A and a second limiting passage 51B. A third limiting passage 52 is formed in the inner rigid body portion 16B.

A locking protrusion 16E that protrudes inward in the radial direction is formed at the central portion in the axial direction on the inner peripheral surface of the outer rigid body portion 16A. The axially inner end of the small-diameter tubular portion 21A of the intermediate tubular member 21 is locked to the outer surface of the locking protrusion 16E facing outward in the axial direction.
The elastic portion 16C is vulcanized and adhered to the inner peripheral surface of the locking protrusion 16E in the outer rigid body portion 16A and the outer peripheral surface of the inner rigid body portion 16B over the entire circumference, whereby the outer rigid body portion 16A and the inner rigid body portion 16B are bonded. Are connected to each other. The volume of the elastic portion 16C is smaller than the volumes of the first main body rubber 13, the second main body rubber 14, and the third main body rubber 15.

The flow path lengths of the first restricted passage 51A and the second restricted passage 51B are longer than the flow path length of the third restricted passage 52. As a result, the circulation resistance of the first limiting passage 51A and the second limiting passage 51B is larger than the circulation resistance of the third limiting passage 52.
Not limited to such an aspect, the flow path cross-sectional area and the flow path length of the first limiting passage 51A, the second limiting passage 51B, and the third limiting passage 52 can be arbitrarily changed. For example, the first limiting passage 51A and the second limiting passage 51B may be formed in the inner rigid body portion 16B, and the third limiting passage 52 may be formed in the outer rigid body portion 16A. Further, the flow resistance of the third restricted passage 52 may be larger than the flow resistance of the first restricted passage 51A and the second restricted passage 51B.

Next, the operation of the vibration isolator 10 will be described.
When the vibration in the axial direction is input, the first liquid chamber 31 having the first pressure receiving liquid chamber 41 and the second pressure receiving liquid chamber 42, and the second having the third pressure receiving liquid chamber 43 and the fourth pressure receiving liquid chamber 44 are provided. One of the liquid chambers 32 is compressed and deformed, and the other is expanded and deformed. At this time, the pair of first main body rubber 13, the second main body rubber 14, the third main body rubber 15, the elastic portion 16C of the partition member 16, the first elastic dividing member 18A, and the second elastic dividing member 18B are elastically deformed, respectively. ..

As a result, the liquid flows between the first pressure receiving liquid chamber 41 and the third pressure receiving liquid chamber 43 through the first limiting passage 51A and the second limiting passage 51B, and the second pressure receiving liquid chamber 42 and the fourth pressure receiving liquid. The liquid flows between the chamber 44 and the third restricted passage 52. Therefore, liquid flows in and out through the first restricted passage 51A, the second restricted passage 51B, and the third restricted passage 52, and liquid column resonance occurs in the first restricted passage 51A and the second restricted passage 51B to attenuate and absorb the vibration. To.
At this time, since the resonance frequencies in the first limiting passage 51A, the second limiting passage 51B, and the third limiting passage 52 are different from each other, the attenuation characteristic can be exhibited in a wide frequency band.

Next, when a lateral vibration that intersects in the axial direction is applied, one of the divided first liquid chambers 31A and 31B partitioned in the first pressure receiving liquid chamber 41 and the position in the circumferential direction thereof become One of the divided second liquid chambers 32A and 32B partitioned in the equivalent third pressure receiving liquid chamber 43 is compressed and deformed, and the other of the divided first liquid chambers 31A and 31B is divided. The other of the second liquid chambers 32A and 32B is expanded and deformed.
As a result, the liquid flows between the divided first liquid chambers 31A and 31B and the divided second liquid chambers 32A and 32B through the first restricted passage 51A and the second restricted passage 51B. Therefore, liquid flows in and out through the first limiting passage 51A and the second limiting passage 51B, liquid column resonance occurs in the first limiting passage 51A and the second limiting passage 51B, and the vibration is attenuated and absorbed.

As described above, according to the vibration isolator 10 according to the present embodiment, it is possible to attenuate and absorb vibrations in the axial direction and the lateral direction.
Further, since the resonance frequencies of the first limiting passage 51A and the second limiting passage 51B are the same, high damping performance can be exhibited against vibration of a specific frequency. On the other hand, for example, if the resonance frequencies of the first limiting passage 51A and the second limiting passage 51B are different, two resonance frequencies will exist, and the liquid column resonance in each of the first limiting passage 51A and the second limiting passage 51B will occur. It becomes possible to level the peaks of the damping characteristic based on the above, the dynamic spring is reduced in a wide frequency band, and the increase in spring at the time of inputting vibration can be suppressed.

Further, all the liquid chambers 41 to 44 partitioned into the first liquid chamber 31 and the second liquid chamber 32 are at least one of the first main body rubber 13, the second main body rubber 14, and the third main body rubber 15. Is a pressure-receiving liquid chamber in which the hydraulic pressure fluctuates with the input of vibration, so the amount of fluctuation of the hydraulic pressure at the time of input of vibration becomes large, and in the axial and lateral directions. It is possible to exert high damping performance against vibration.

Further, the first limiting passage 51A and the second limiting passage 51B are located outside the first to fourth pressure receiving liquid chambers 41 to 44 in the axial direction, and the first pressure receiving liquid chamber 41 and the third pressure receiving liquid chamber 43 are connected to each other. The third limiting passage 52 communicates with the second pressure receiving liquid chamber 42 and the fourth pressure receiving liquid chamber 44 located inside in the axial direction among the first to fourth pressure receiving liquid chambers 41 to 44. Therefore, it is not necessary to intersect the first restricted passage 51A, the second restricted passage 51B, and the third restricted passage 52 with each other, and the first restricted passage 51A, the second restricted passage 51B, and the third restricted passage 52. The passage 52 can be easily formed.

Further, among the first to fourth pressure receiving liquid chambers 41 to 44, the first pressure receiving liquid chamber 41 and the third pressure receiving liquid chamber 43 located outside in the axial direction are the divided first liquid chambers 31A and 31B and the divided second liquid chambers 31A and 31B. Since the liquid chambers 32A and 32B are partitioned, the divided first liquid chambers 31A and 31B and the divided second liquid chambers 32A and 32B are located inside the second liquid chambers 42 and 4 in the axial direction. Compared with a configuration in which the liquid chambers 44 are partitioned, it becomes easier to secure at least a distance between the divided first liquid chambers 31A and 31B and the divided second liquid chambers 32A and 32B, and the first restricted passage 51A and The flow path length of the second limiting passage 51B can be easily secured.

Further, since the elastic portion 16C of the partition member 16 connects the outer rigid body portion 16A and the inner rigid body portion 16B, for example, when the partition member 16 is assembled to the outer mounting member 11 and the inner mounting member 12, it is elastic. By deforming the portion 16C, it becomes possible to easily assemble, and it is possible to easily improve the assembleability.

The technical scope of the present invention is not limited to the above-described embodiment, and various modifications can be made without departing from the spirit of the present invention.
For example, in the above embodiment, the vibration isolator 10 includes the second main body rubber 14 and the third main body rubber 15, and the vibration isolator 10 is divided into four pressure receiving liquid chambers 41 to 44. , The mode is not limited to this. The anti-vibration device 10 does not include the second main body rubber 14 and the third main body rubber 15, and the anti-vibration device 10 has two liquid chambers defined by the pair of the first main body rubber 13 and the partition member 16. There may be.

Further, in the above embodiment, of the first to fourth pressure receiving liquid chambers 41 to 44, the first pressure receiving liquid chamber 41 and the third pressure receiving liquid chamber 43 located outside in the axial direction are the first elastic dividing member 18A. The configuration is divided in the circumferential direction by the second elastic dividing member 18B, but the present invention is not limited to this aspect. The second pressure receiving liquid chamber 42 and the fourth pressure receiving liquid chamber 44 located inside in the axial direction may be partitioned in the circumferential direction by the elastic dividing member, and all the pressure receiving liquid chambers 41 to 44 are 2 in the circumferential direction. One liquid chamber may be partitioned.
Further, when all the first to fourth pressure receiving liquid chambers 41 to 44 are partitioned in the circumferential direction in this way, the elastic dividing member that partitions the first pressure receiving liquid chamber 41 and the third pressure receiving liquid chamber 43 and By making the positions in the circumferential direction of the elastic dividing member that divides the second pressure receiving liquid chamber 42 and the fourth pressure receiving liquid chamber 44 different from each other, it is possible to exhibit damping performance against vibration in all directions.

Further, in the above embodiment, the partition member 16 includes an annular outer rigid body portion 16A connected to the outer mounting member 11, an annular inner rigid body portion 16B connected to the inner mounting member 12, and an outer rigid body portion 16A. Although the configuration including the annular elastic portion 16C connecting the inner rigid body portion 16B and the annular elastic portion 16C is shown, the present invention is not limited to such an embodiment. The partition member may include, for example, only a rigid body portion.

Further, in the above embodiment, the anti-vibration device 10 is provided with one second main body rubber 14 and one third main body rubber 15, but the present invention is not limited to such a mode. The vibration isolator 10 may include a plurality of second main body rubber 14 and a plurality of third main body rubber 15, and five or more pressure receiving liquid chambers may be partitioned in the liquid chamber 30.

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

10 Anti-vibration device 11 Outer mounting member 12 Inner mounting member 13 1st body rubber 14 2nd body rubber 15 3rd body rubber 16 Partition member 16A Outer rigid body part 16B Inner rigid body part 16C Elastic part 18A 1st elastic split member 18B 2nd Elastic split member 31 1st liquid chamber 31A, 31B Divided 1st liquid chamber 32 2nd liquid chamber 32A, 32B Divided 2nd liquid chamber 41 1st pressure receiving liquid chamber 42 2nd pressure receiving liquid chamber 43 3rd pressure receiving liquid chamber 44 4th Pressure receiving liquid chamber 51A 1st restricted passage 51B 2nd restricted passage 52 3rd restricted passage

Claims (3)

A tubular outer mounting member connected to either one of the vibration generating portion and the vibration receiving portion, and an inner mounting member connected to the other and arranged inside the outer mounting member.
A pair of first main body rubbers that connect the outer mounting member and the inner mounting member and are arranged at intervals in the axial direction along the central axis of the outer mounting member.
A partition member that connects the outer mounting member and the inner mounting member and divides the pair of liquid chambers between the first main body rubbers into a first liquid chamber and a second liquid chamber in the axial direction.
A first elastic dividing member that divides the first liquid chamber in the circumferential direction and defines two divided first liquid chambers.
A second elastic dividing member for partitioning the second liquid chamber in the circumferential direction and defining the two divided second liquid chambers is provided.
The first elastic dividing member and the second elastic dividing member are respectively arranged at equivalent circumferential positions.
The partition member is formed with a first limiting passage and a second limiting passage that separately communicate the divided first liquid chamber and the divided second liquid chamber, which are arranged in different positions in the circumferential direction .
A second main body rubber that partitions the first liquid chamber into a first pressure receiving liquid chamber in which the first main body rubber is a part of a partition wall and a second pressure receiving liquid chamber in which the partition member is a part of a partition wall.
A third main body rubber for partitioning the second liquid chamber into a third pressure receiving liquid chamber having the first main body rubber as a part of the partition wall and a fourth pressure receiving liquid chamber having the partition member as a part of the partition wall. With
The first elastic dividing member partitions at least one of the first pressure receiving liquid chamber and the second pressure receiving liquid chamber in the circumferential direction.
The second elastic dividing member is a vibration isolator that partitions at least one of the third pressure receiving liquid chamber and the fourth pressure receiving liquid chamber in the circumferential direction . The first elastic dividing member partitions the first pressure receiving liquid chamber in the circumferential direction, and the second elastic dividing member partitions the third pressure receiving liquid chamber in the circumferential direction.
The anti-vibration device according to claim 1, wherein the partition member is formed with a third limiting passage that connects the second pressure receiving liquid chamber and the fourth pressure receiving liquid chamber. A tubular outer mounting member connected to either one of the vibration generating portion and the vibration receiving portion, and an inner mounting member connected to the other and arranged inside the outer mounting member.
A pair of first main body rubbers that connect the outer mounting member and the inner mounting member and are arranged at intervals in the axial direction along the central axis of the outer mounting member.
A partition member that connects the outer mounting member and the inner mounting member and divides the pair of liquid chambers between the first main body rubbers into a first liquid chamber and a second liquid chamber in the axial direction.
A first elastic dividing member that divides the first liquid chamber in the circumferential direction and defines two divided first liquid chambers.
A second elastic dividing member for partitioning the second liquid chamber in the circumferential direction and defining the two divided second liquid chambers is provided.
The first elastic dividing member and the second elastic dividing member are respectively arranged at equivalent circumferential positions.
The partition member is formed with a first limiting passage and a second limiting passage that separately communicate the divided first liquid chamber and the divided second liquid chamber, which are arranged in different positions in the circumferential direction .
The partition member is an annular outer rigid body portion connected to the outer mounting member, an annular inner rigid body portion connected to the inner mounting member, and an annular shape connecting the outer rigid body portion and the inner rigid body portion. A vibration isolator characterized by having an elastic part.

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