JP2017003050A - Vibration isolator - Google Patents

Abstract

PROBLEM TO BE SOLVED: To improve damping characteristic to vibration in an axial direction.SOLUTION: A vibration isolator 10 includes: a cylindrical outer attachment member 11 connected to one of a vibration generating portion and a vibration receiving portion; an inner attachment member 12 connected to the other, and disposed inside of the outer attachment member 11; a rubber elastic body 13 connecting both attachment members 11, 12; a first liquid chamber 15 accommodating a liquid L; a second liquid chamber 14 accommodating the liquid L and applying the rubber elastic body 13 as a part of a partition wall; a communication passage for communicating both liquid chambers 14, 15; a first stopper portion 21 disposed at one side in an axial direction A along a center axis O of the outer attachment member 11 to the part 18 configuring the partition wall of the second liquid chamber 14, of the rubber elastic body 13; and a second stopper portion 22 disposed at the other side. The first stopper portion 21 is disposed on an inner peripheral face of the outer attachment member 11 in a projecting manner, and the second stopper portion 22 is disposed on an outer peripheral face of the inner attachment member 12 in a projecting manner.SELECTED DRAWING: Figure 3

Description

  The present invention relates to a vibration isolator.

Conventionally, a vibration isolator as shown in Patent Document 1 below is known. The vibration isolator includes a cylindrical outer mounting member connected to one of the vibration generating unit and the vibration receiving unit, and an inner mounting member connected to the other and disposed inside the outer mounting member. A rubber elastic body that couples the two attachment members, a first liquid chamber in which the liquid is stored, a second liquid chamber in which the liquid is stored and the rubber elastic body is a part of the partition wall, and And a communication passage communicating the two liquid chambers.
In this vibration isolator, when vibration is input and the rubber elastic body is deformed and the volume of the second liquid chamber is changed, the liquid flows between the first liquid chamber and the second liquid chamber through the communication path, Vibration is damped and absorbed.

JP 2006-349068 A

  In the conventional vibration isolator, there is room for improvement in improving damping characteristics against vibrations input in the axial direction along the central axis of the outer mounting member.

  The present invention has been made in view of the above-described circumstances, and an object of the present invention is to improve damping characteristics against axial vibration.

In order to solve the above problems, the present invention proposes the following means.
A vibration isolator according to the present invention is a cylindrical outer mounting member connected to one of a vibration generating portion and a vibration receiving portion, and is connected to the other and disposed inside the outer mounting member. An inner mounting member, a rubber elastic body that connects these two mounting members, a first liquid chamber that stores a liquid, and a second liquid that stores the liquid and uses the rubber elastic body as a part of a partition wall A vibration-proof device comprising a chamber and a communication passage communicating between the two liquid chambers, wherein the outer mounting member is disposed on a portion of the rubber elastic body forming a partition wall of the second liquid chamber. A first stopper portion disposed on one side in the axial direction along the central axis, and a second stopper portion disposed on the other side, wherein the first stopper portion protrudes from an inner peripheral surface of the outer mounting member And the second stopper portion is Characterized in that it is projected from the outer peripheral surface of serial inner mounting member.

In this case, when axial vibration is input to the vibration isolator, the two attachment members are relatively displaced in the axial direction, and the rubber elastic body is deformed in the axial direction. At this time, when the inner mounting member is displaced toward the one side in the axial direction with respect to the outer mounting member, the first stopper portion and the second stopper portion sandwich the rubber elastic body in the axial direction. Then, these two stopper portions restrict deformation in the axial direction in the portion of the rubber elastic body forming the partition wall of the second liquid chamber (hereinafter referred to as “partition wall portion”). Each is forcibly deformed inside the second liquid chamber. As a result, the volume of the second liquid chamber is reduced, the liquid in the second liquid chamber is pushed out of the second liquid chamber, and travels between the first liquid chamber and the second liquid chamber through the communication path, and the vibration is attenuated and absorbed. Is done.
As described above, with a simple configuration in which the first stopper portion and the second stopper portion are provided, it is possible to improve the damping characteristics against the vibration in the axial direction at a low cost. Here, the first stopper portion and the second stopper portion are not provided in common on either the inner peripheral surface of the outer mounting member or the outer peripheral surface of the inner mounting member. The second stopper portion protrudes from the outer peripheral surface of the inner mounting member while protruding from the inner peripheral surface of the mounting member. Therefore, when the inner mounting member is displaced toward one side in the axial direction with respect to the outer mounting member, the rubber elastic body can be sandwiched in the axial direction by the first stopper portion and the second stopper portion. As a result, it is possible to easily reduce the volume of the second liquid chamber, and it is possible to reliably improve the attenuation characteristics.

  The first stopper portion may protrude in a radial direction perpendicular to the central axis from the inner peripheral surface of the outer mounting member toward the outer peripheral surface of the inner mounting member.

In this case, the first stopper portion projects in the radial direction from the inner peripheral surface of the outer mounting member toward the outer peripheral surface of the inner mounting member. Therefore, when both the mounting members try to displace relatively in the radial direction, the protruding end portion of the first stopper portion is abutted against the outer peripheral surface of the inner mounting member, and the first stopper portion is brought into contact with the inner peripheral surface of the outer mounting member. It can be stretched between the outer peripheral surface of the inner mounting member. As a result, the first stopper portion can regulate the relative displacement amount of both mounting members in the radial direction. For example, the first stopper portion can be used as a rebound stopper, a stopper against radial vibration, or the like. Can function.
Further, since the first stopper portion protrudes in the radial direction from the inner peripheral surface of the outer mounting member to the outer peripheral surface of the inner mounting member, the first stopper portion can be disposed inside the outer mounting member. Thereby, while ensuring the rigidity of a 1st stopper part, size reduction and cost reduction of a vibration isolator can be achieved.

  The second stopper portion may protrude in a radial direction perpendicular to the central axis from the outer peripheral surface of the inner mounting member toward the inner peripheral surface of the outer mounting member.

In this case, the second stopper portion protrudes in the radial direction from the outer peripheral surface of the inner mounting member toward the inner peripheral surface of the outer mounting member. Therefore, when both the mounting members try to displace relatively in the radial direction, the protruding end portion of the second stopper portion is abutted against the inner peripheral surface of the outer mounting member, and the second stopper portion is brought into contact with the outer peripheral surface of the inner mounting member. It can be stretched between the inner peripheral surface of the outer mounting member. As a result, the second stopper portion can regulate the relative displacement amount in the radial direction of both mounting members. For example, the second stopper portion can be used as a rebound stopper, a stopper against radial vibration, or the like. Can function.
Further, since the second stopper portion protrudes in the radial direction from the outer peripheral surface of the inner mounting member to the inner peripheral surface of the outer mounting member, the second stopper portion can be disposed inside the outer mounting member. Thereby, while ensuring the rigidity of a 2nd stopper part, size reduction and cost reduction of a vibration isolator can be achieved.

  The rubber elastic body is elastically deformed while the outer attachment member is connected to one of the vibration generating portion and the vibration receiving portion, and the inner attachment member is connected to the other. In the state where the volume of the liquid chamber is reduced, in each of the first stopper portion and the second stopper portion, at least a part of the inner side surface facing the rubber elastic body side along the axial direction is from the rubber elastic body to the axial direction. You may be away.

  In this case, at least a part of the inner surface of each of the first stopper portion and the second stopper portion is separated from the rubber elastic body in the axial direction. Therefore, when a vibration with a small amplitude is input in the axial direction, the deformation of the partition portion of the rubber elastic body is suppressed excessively by the first stopper portion and the second stopper portion, and the rubber elastic body is gently deformed. It is possible to suppress a sudden increase in the spring constant.

  The rubber elastic body is elastically deformed while the outer attachment member is connected to one of the vibration generating portion and the vibration receiving portion, and the inner attachment member is connected to the other. In a state where the volume of the liquid chamber is reduced, the first stopper portion and the second stopper portion may face each other in the axial direction via the rubber elastic body.

  In this case, the first stopper portion and the second stopper portion face each other in the axial direction via the rubber elastic body. Therefore, when the first stopper portion and the second stopper portion sandwich the rubber elastic body in the axial direction, the second liquid chamber can be more easily reduced in volume, and the damping characteristic can be improved more reliably. be able to.

  The first liquid chamber, the second liquid chamber, and the communication path are formed in the rubber elastic body, and the first liquid chamber and the second liquid chamber are spaced apart in a circumferential direction around the central axis. A third stopper portion disposed on one side in the axial direction and a fourth stopper disposed on the other side with respect to a portion of the rubber elastic body forming the partition wall of the first liquid chamber. The third stopper portion may protrude from the outer peripheral surface of the inner mounting member, and the fourth stopper portion may protrude from the inner peripheral surface of the outer mounting member.

In this case, when the axial vibration is input and the inner mounting member is displaced toward the one side in the axial direction with respect to the outer mounting member, as described above, the first stopper portion and the second stopper are provided. The volume of the second liquid chamber is reduced by the part. On the other hand, since both the third stopper portion and the fourth stopper portion are separated from the rubber elastic body in the axial direction, the volume of the first liquid chamber is not reduced by the third stopper portion and the fourth stopper portion. . As a result, the liquid in the second liquid chamber is pushed out of the second liquid chamber and travels between the first liquid chamber and the second liquid chamber through the communication path, and the vibration is attenuated and absorbed.
Further, when the inner mounting member is displaced toward the other side in the axial direction with respect to the outer mounting member, the first liquid chamber is reduced in volume by the third stopper portion and the fourth stopper portion. The liquid chamber is not reduced in volume by the first stopper portion and the second stopper portion. As a result, the liquid in the first liquid chamber is pushed out of the first liquid chamber and travels between the first liquid chamber and the second liquid chamber through the communication path, and the vibration is attenuated and absorbed.
As described above, regardless of which side of the inner mounting member is displaced in the axial direction with respect to the outer mounting member, the liquid can be made to travel between the first liquid chamber and the second liquid chamber through the communication path. Thus, the attenuation characteristic can be effectively improved.

  ADVANTAGE OF THE INVENTION According to this invention, the damping characteristic with respect to the vibration of an axial direction can be improved.

It is a side view of the vibration isolator which concerns on 1st Embodiment of this invention. It is an II-II cross-sectional arrow view shown in FIG. FIG. 3 is a cross-sectional view taken along the line III-III shown in FIG. 2. FIG. 3 is a cross-sectional view corresponding to the III-III cross-sectional view shown in FIG. 2 and showing a connected state. It is sectional drawing of the vibration isolator which concerns on 2nd Embodiment of this invention, Comprising: It is sectional drawing equivalent to the II-II sectional arrow view shown in FIG. FIG. 6 is a sectional view taken along the line VI-VI shown in FIG. 5.

(First embodiment)
Hereinafter, a vibration isolator 10 according to a first embodiment of the present invention will be described with reference to FIGS. 1 to 4.
As shown in FIGS. 1 to 3, the vibration isolator 10 (rubber bush) is connected to a cylindrical outer mounting member 11 connected to one of a vibration generating part and a vibration receiving part, and the other. In addition, the inner mounting member 12 disposed inside the outer mounting member 11, the rubber elastic body 13 that couples both the mounting members 11 and 12, and the liquid L are contained and the rubber elastic body 13 is used as a partition wall. A main liquid chamber 14 (second liquid chamber) and a sub liquid chamber 15 (first liquid chamber) are provided as a part, and a communication path 16 that communicates the liquid chambers 14 and 15 with each other.
In the following, the direction along the central axis O of the outer mounting member 11 is referred to as an axial direction A, the direction orthogonal to the central axis O is referred to as the radial direction, and the direction around the central axis O is referred to as the circumferential direction.

The inner mounting member 12 is formed in a cylindrical shape, and the central axis O of the inner mounting member 12 is parallel to the central axis O of the outer mounting member 11.
The main liquid chamber 14 and the sub liquid chamber 15 are arranged at intervals in the circumferential direction. The main liquid chamber 14 and the sub liquid chamber 15 are disposed inside the outer mounting member 11 and sandwich the inner mounting member 12 therebetween. Hereinafter, the direction in which both liquid chambers 14 and 15 sandwich the inner mounting member 12 among the directions orthogonal to the central axis O is referred to as a first direction B. Of the directions orthogonal to the central axis O, the direction orthogonal to the first direction B is referred to as a second direction C. In the present embodiment, the central axis O of the inner mounting member 12 is offset in the first direction B with respect to the central axis O of the outer mounting member 11.

A main liquid chamber 14, a sub liquid chamber 15, and a communication path 16 are formed in the rubber elastic body 13. The rubber elastic body 13 includes a main spring portion 17 and a partition wall portion 18.
The main spring portion 17 protrudes from the inner mounting member 12 to both sides in the second direction C and is connected to the inner peripheral surface of the outer mounting member 11. Portions of the main spring portion 17 facing both sides in the first direction B form partition walls for the main liquid chamber 14 and the sub liquid chamber 15. A through space 19 penetrating in the axial direction A is formed in a portion of the main spring portion 17 located between the inner mounting member 12 and the auxiliary liquid chamber 15. A portion of the main spring portion 17 located between the through space 19 and the sub liquid chamber 15 is a diaphragm that absorbs a change in the volume of the sub liquid chamber 15 due to the flow of the liquid L into and out of the sub liquid chamber 15. Function. The vibration isolator 10 is an air release type.

As shown in FIG. 3, the partition wall portion 18 forms a partition wall for each of the main liquid chamber 14 and the sub liquid chamber 15. A pair of partition walls 18 is provided for each of the liquid chambers 14 and 15, and closes each of the liquid chambers 14 and 15 from both sides in the axial direction A.
As shown in FIG. 2, the communication path 16 is formed in the main spring portion 17 of the rubber elastic body 13. A pair of communication passages 16 are arranged with the inner mounting member 12 sandwiched in the second direction C. The communication path 16 is disposed between the outer peripheral surface of the main spring portion 17 and the inner peripheral surface of the outer mounting member 11, and is formed in a groove shape extending in the circumferential direction on the outer peripheral surface of the main spring portion 17. One end of the communication passage 16 in the circumferential direction opens to the main liquid chamber 14, and the other end opens to the sub liquid chamber 15.

  As shown in FIG. 3, the vibration isolator 10 further includes a first stopper portion 21 and a second stopper portion 22. These stopper portions 21 and 22 are arranged so as to sandwich the rubber elastic body 13 in the axial direction A. In this embodiment, the portion of the rubber elastic body 13 in which the main liquid chamber 14 is formed is a shaft. It is sandwiched in the direction A. Both stopper portions 21 and 22 are disposed on the main liquid chamber 14 side along the first direction B with respect to the inner mounting member 11, and the hardness and rigidity of both stopper portions 21 and 22 are rubber elastic bodies, respectively. Higher than 13 hardness and stiffness.

The first stopper portion 21 protrudes from the inner peripheral surface of the outer mounting member 11, and is one side in the axial direction A (in FIG. 3) with respect to the partition wall portion 18 of the main liquid chamber 14 in the rubber elastic body 13. On the right side of the page). The first stopper portion 21 projects inward in the first direction B (radial direction) from the inner peripheral surface of the outer mounting member 11 toward the outer peripheral surface of the inner mounting member 12.
The second stopper portion 22 protrudes from the outer peripheral surface of the inner mounting member 12 and is on the other side in the axial direction A with respect to the partition wall portion 18 of the main liquid chamber 14 in the rubber elastic body 13 (in FIG. On the left). The second stopper portion 22 protrudes outward in the first direction B (radial direction) from the outer peripheral surface of the inner mounting member 12 toward the inner peripheral surface of the outer mounting member 11. In the illustrated example, the second stopper portion 22 is larger in the first direction B than the first stopper portion 21.

  The vibration isolator 10 can be applied to, for example, a vehicle such as an automobile. Specifically, the vibration isolator 10 is used for a connecting portion on the power plant (vibration generating unit) side of a torque rod (anti-vibration link device) (not shown). be able to. The torque rod connects a power plant such as an engine of an automobile to a vehicle body side member (vibration receiving portion) such as a subframe, and restricts excessive swinging of the power plant. The torque rod includes a bracket (not shown) into which the vibration isolator 10 is fitted, and the vibration isolator 10 is coupled to the vehicle body side member via the bracket.

  In the vibration isolator 10, the initial load is input when the outer mounting member 11 is connected to the vehicle body side member and the inner mounting member 12 is connected to the power plant. Then, as shown in FIG. 4, the inner mounting member 12 is displaced toward the main liquid chamber 14 along the first direction B with respect to the outer mounting member 11, and the rubber elastic body 13 is elastically deformed while the main elastic chamber 13 is elastically deformed. The liquid chamber 14 is reduced in volume.

  In this state (hereinafter referred to as “connected state”), in each of the first stopper portion 21 and the second stopper portion 22, at least a part of the inner side surface facing the inner side (rubber elastic body 13 side) along the axial direction A is , Away from the rubber elastic body 13 in the axial direction A. In the present embodiment, the first gap 21 a in the axial direction A is provided between the base end portion of the first stopper portion 21 and the partition wall portion 18 forming the main liquid chamber 14, and the second stopper portion 22 is provided. A second gap 22 a in the axial direction A is provided between the base end of the first liquid crystal and the partition wall 18 that forms the main liquid chamber 14. Further, in the connected state, the first stopper portion 21 and the second stopper portion 22 are opposed to each other in the axial direction A via the rubber elastic body 13 and the main liquid chamber 14.

The vibration isolator 10 is mainly inputted with vibration in the first direction B and vibration in the axial direction A from the power plant.
When vibration in the first direction B is input to the vibration isolator 10, when the inner mounting member 12 and the outer mounting member 11 are relatively displaced in the first direction B, the main liquid chamber 14 is deformed along with the deformation of the rubber elastic body 13. Of the main fluid chamber 14 changes. Then, the liquid L travels between the main liquid chamber 14 and the sub liquid chamber 15 through the communication path 16, and is based on, for example, the flow resistance of the liquid L, resonance (liquid column resonance) generated in the communication path 16, or the like. Vibrations are damped and absorbed.

When the inner mounting member 12 is displaced toward the main liquid chamber 14 in the first direction B with respect to the outer mounting member 11, the first stopper portion 21 and the second stopper portion 22 cause the shaft of the partition wall portion 18 of the rubber elastic body 13 to move. The bulging deformation toward the outside in the direction A is restricted. As a result, the volume of the main liquid chamber 14 can be greatly reduced.
At this time, for example, the protruding end of the first stopper portion 21 is abutted against the outer peripheral surface of the inner mounting member 12, or the protruding end portion of the second stopper portion 22 is abutted against the inner peripheral surface of the outer mounting member 11. For example, the first stopper portion 21 and the second stopper portion 22 can be stretched between the outer peripheral surface of the inner mounting member 12 and the inner peripheral surface of the outer mounting member 11. As a result, the first stopper portion 21 and the second stopper portion 22 can regulate the relative displacement amount of the mounting members 11 and 12 in the first direction B, and the first stopper portion 21 and the second stopper portion 22 can be regulated. The stopper portion 22 can function as, for example, a rebound stopper or a stopper against vibration in the first direction B.

  On the other hand, when vibration in the axial direction A is input to the vibration isolator 10, both the attachment members 11 and 12 are relatively displaced in the axial direction A, and the rubber elastic body 13 is deformed in the axial direction A. At this time, when the inner mounting member 12 is displaced toward one side in the axial direction A with respect to the outer mounting member 11, the first stopper portion 21 and the second stopper portion 22 sandwich the rubber elastic body 13 in the axial direction A. . Then, these both stopper parts 21 and 22 restrict | deform the deformation | transformation to the axial direction A in the partition part 18 of the rubber elastic body 13, and the partition part 18 of the rubber elastic body 13 is forced inside the main liquid chamber 14, respectively. To deform. As a result, the volume of the main liquid chamber 14 is reduced, and the liquid L in the main liquid chamber 14 is pushed out of the main liquid chamber 14 and travels between the main liquid chamber 14 and the sub liquid chamber 15 through the communication path 16. For example, the vibration is attenuated and absorbed based on the flow resistance of the liquid L, resonance (liquid column resonance) generated in the communication path 16, and the like.

  As described above, according to the vibration isolator 10 according to the present embodiment, the damping characteristic with respect to the vibration in the axial direction A can be reduced at a low cost by a simple configuration in which the first stopper portion 21 and the second stopper portion 22 are provided. Can be improved. Here, the first stopper portion 21 and the second stopper portion 22 are not provided in common on either the inner peripheral surface of the outer mounting member 11 or the outer peripheral surface of the inner mounting member 12. The portion 21 protrudes from the inner peripheral surface of the outer mounting member 11, while the second stopper portion 22 protrudes from the outer peripheral surface of the inner mounting member 12. Therefore, when the inner mounting member 12 is displaced toward one side in the axial direction A with respect to the outer mounting member 11, the rubber elastic body 13 is sandwiched in the axial direction A by the first stopper portion 21 and the second stopper portion 22. be able to. As a result, the volume of the main liquid chamber 14 can be easily reduced, and the damping characteristics can be improved reliably.

In addition, since the first stopper portion 21 protrudes in the first direction B from the inner peripheral surface of the outer mounting member 11 toward the outer peripheral surface of the inner mounting member 12, the first stopper portion 21 is disposed inside the outer mounting member 11. Can be arranged. Thereby, while ensuring the rigidity of the 1st stopper part 21, size reduction and cost reduction of the vibration isolator 10 can be achieved.
Further, since the second stopper portion 22 protrudes in the first direction B from the outer peripheral surface of the inner mounting member 12 toward the inner peripheral surface of the outer mounting member 11, the second stopper portion 22 is disposed on the inner side of the outer mounting member 11. Can be arranged. Thereby, while ensuring the rigidity of the 2nd stopper part 22, size reduction and cost reduction of the vibration isolator 10 can be achieved.

  In the connected state, at least a part of the inner surface of each of the first stopper portion 21 and the second stopper portion 22 is separated from the rubber elastic body 13 in the axial direction A. Therefore, when a vibration with a small amplitude is input in the axial direction A, the first stopper portion 21 and the second stopper portion 22 prevent the deformation of the partition wall portion 18 of the rubber elastic body 13 from being excessively restricted, and the rubber elasticity The body 13 can be gently deformed to suppress a rapid increase in the spring constant.

  In the connected state, the first stopper portion 21 and the second stopper portion 22 are opposed to each other in the axial direction A through the rubber elastic body 13. Accordingly, when the first stopper portion 21 and the second stopper portion 22 sandwich the rubber elastic body 13 in the axial direction A, the volume of the main liquid chamber 14 can be more easily reduced, and the damping characteristic is further improved. It can certainly be improved.

  In this embodiment, when the inner mounting member 12 is displaced toward the one side in the axial direction A with respect to the outer mounting member 11, the rubber elastic body 13 is pivoted by the first stopper portion 21 and the second stopper portion 22. It was sandwiched in direction A. In addition to this, when the inner mounting member 12 is displaced toward the other side in the axial direction A with respect to the outer mounting member 11, the first additional stopper portion and the first additional stopper portion are arranged so as to sandwich the rubber elastic body 13 in the axial direction A. 2 It is also possible to provide an additional stopper. As a 1st additional stopper part, the structure which has arrange | positioned the member of the shape equivalent to the 1st stopper part 21 on the other side of the axial direction A with respect to the rubber elastic body 13 on the internal peripheral surface of the outer side attachment member 11. As the second additional stopper portion, a member having the same shape as the second stopper portion 22 is formed on the outer peripheral surface of the inner mounting member 12 in the axial direction A with respect to the rubber elastic body 13. It is possible to employ a configuration arranged on one side. In this case, the first stopper portion 21 and the second stopper portion 22, and the first additional stopper portion and the second additional stopper portion can be arranged with their positions shifted in the circumferential direction.

(Second Embodiment)
Next, the vibration isolator 30 of 2nd Embodiment which concerns on this invention is demonstrated with reference to FIG. 5 and FIG.
In the second embodiment, the same components as those in the first embodiment are denoted by the same reference numerals, description thereof is omitted, and only different points will be described.

  In the vibration isolator 30 of the present embodiment, a pressure receiving liquid chamber 31 (first liquid chamber) is provided instead of providing the sub liquid chamber 15. Similar to the main liquid chamber 14, the pressure receiving liquid chamber 31 expands and contracts based on the relative displacement between the inner mounting member 12 and the outer mounting member 11, and the hydraulic pressure fluctuates. In the present embodiment, the main spring portion 17 does not have the through space 19, and the portion of the main spring portion 17 located on the pressure receiving liquid chamber 31 side in the first direction B does not function as a diaphragm, and is a vibration isolator. 30 is a differential type.

  As shown in FIG. 6, the vibration isolator 30 further includes a third stopper portion 33 and a fourth stopper portion 34. These both stopper parts 33 and 34 are arrange | positioned so that the rubber elastic body 13 may be pinched | interposed into the axial direction A, and in this embodiment, the part in which the pressure receiving liquid chamber 31 was formed among the rubber elastic bodies 13 is set as an axis | shaft. It is sandwiched in the direction A. Both stopper portions 33 and 34 are disposed on the pressure receiving liquid chamber 31 side along the first direction B with respect to the inner mounting member 11. The hardness and rigidity of both stopper portions 33 and 34 are rubber elastic bodies, respectively. Higher than 13 hardness and stiffness.

The third stopper portion 33 projects from the outer peripheral surface of the inner mounting member 12 and is one side in the axial direction A with respect to the partition wall portion 18 of the pressure receiving liquid chamber 31 of the rubber elastic body 13 (in FIG. On the right). The third stopper portion 33 protrudes outward in the first direction B (radial direction) from the outer peripheral surface of the inner mounting member 12 toward the inner peripheral surface of the outer mounting member 11.
The fourth stopper portion 34 protrudes from the inner peripheral surface of the outer mounting member 11, and the other side in the axial direction A with respect to the partition wall portion 18 of the pressure receiving liquid chamber 31 in the rubber elastic body 13 (in FIG. 6). On the left side of the page). The fourth stopper portion 34 projects inward in the first direction B (radial direction) from the inner peripheral surface of the outer mounting member 11 toward the outer peripheral surface of the inner mounting member 12.

  In the vibration isolator 30, when the vibration in the axial direction A is input and the inner mounting member 12 is displaced toward the one side in the axial direction A with respect to the outer mounting member 11, as described above, The volume of the main liquid chamber 14 is reduced by the first stopper portion 21 and the second stopper portion 22. On the other hand, since the third stopper part 33 and the fourth stopper part 34 are both separated from the rubber elastic body 13 in the axial direction A, the pressure receiving liquid chamber 31 is reduced by the third stopper part 33 and the fourth stopper part 34. It is not tolerated. As a result, the liquid L in the main liquid chamber 14 is pushed out of the main liquid chamber 14 and travels between the pressure receiving liquid chamber 31 and the main liquid chamber 14 through the communication path 16, and the vibration is attenuated and absorbed.

  Further, when the inner mounting member 12 is displaced toward the other side in the axial direction A with respect to the outer mounting member 11, the pressure receiving liquid chamber 31 is reduced in volume by the third stopper portion 33 and the fourth stopper portion 34. On the other hand, the volume of the main liquid chamber 14 is not reduced by the first stopper portion 21 and the second stopper portion 22. As a result, the liquid L in the pressure receiving liquid chamber 31 is pushed out of the pressure receiving liquid chamber 31 and travels between the pressure receiving liquid chamber 31 and the main liquid chamber 14 through the communication path 16, and the vibration is attenuated and absorbed.

As described above, according to the vibration isolator 30 according to the present embodiment, even when the inner mounting member 12 is displaced in the axial direction A with respect to the outer mounting member 11, the liquid L is It is possible to move between the pressure receiving liquid chamber 31 and the main liquid chamber 14 through the communication path 16, and the damping characteristics can be effectively improved.
Note that the third stopper portion 33 and the fourth stopper portion 34 may be omitted.

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

  For example, the first stopper portion 21 extends in the first direction B from the portion of the inner peripheral surface of the outer mounting member 11 that is located on the sub liquid chamber 15 side (pressure receiving liquid chamber 31 side) along the first direction B. You may employ | adopt the structure which protrudes toward the main liquid chamber 14 side along. In this case, the first stopper portion 21 is configured to face the main liquid chamber 14 by projecting from the inner peripheral surface of the outer mounting member 11 and then passing through one side of the inner mounting member 12 across the central axis O. It is also possible to adopt.

  In the above-described embodiment, at least a part of the inner surface of each of the first stopper portion 21 and the second stopper portion 22 is separated from the rubber elastic body 13 in the axial direction A in the connected state. Not limited to. For example, the inner surface of each of the first stopper portion 21 and the second stopper portion 22 may be in contact with the rubber elastic body 13 over the entire area.

  In the said embodiment, although the 1st stopper part 21 and the 2nd stopper part 22 were facing the axial direction A through the rubber elastic body 13 in the connection state, this invention is not limited to this. For example, the first stopper portion 21 and the second stopper portion 22 do not have to face the axial direction A via the rubber elastic body 13.

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

10, 30 Vibration isolator 11 Outer mounting member 12 Inner mounting member 13 Rubber elastic body 14 Main liquid chamber (second liquid chamber)
15 Secondary liquid chamber (first liquid chamber)
16 communication path 21 1st stopper part 22 2nd stopper part 31 Pressure receiving liquid chamber (1st liquid chamber)
33 Third stopper portion 34 Fourth stopper portion A Axial direction L Liquid O Center axis

Claims (6)

A cylindrical outer mounting member connected to any one of the vibration generating unit and the vibration receiving unit, and an inner mounting member connected to the other and disposed inside the outer mounting member;
A rubber elastic body for connecting these both mounting members;
A first liquid chamber for containing a liquid;
A second liquid chamber containing liquid and having the rubber elastic body as a part of a partition;
A vibration isolating device comprising a communication passage communicating these two liquid chambers,
A first stopper portion disposed on one side in the axial direction along the central axis of the outer mounting member and a portion disposed on the other side with respect to a portion forming the partition wall of the second liquid chamber in the rubber elastic body. A second stopper portion;
The first stopper portion protrudes from an inner peripheral surface of the outer mounting member, and the second stopper portion protrudes from an outer peripheral surface of the inner mounting member. .   2. The prevention according to claim 1, wherein the first stopper portion protrudes in a radial direction perpendicular to the central axis from the inner peripheral surface of the outer mounting member toward the outer peripheral surface of the inner mounting member. Shaker.   The said 2nd stopper part protrudes in the radial direction orthogonal to the said center axis line from the outer peripheral surface of the said inner side attachment member toward the inner peripheral surface of the said outer side attachment member. The vibration isolator as described. The rubber elastic body is elastically deformed while the outer attachment member is connected to one of the vibration generating portion and the vibration receiving portion, and the inner attachment member is connected to the other. With the volume of the liquid chamber reduced,
In each of the first stopper portion and the second stopper portion, at least a part of an inner surface facing the rubber elastic body side along the axial direction is separated from the rubber elastic body in the axial direction. The vibration isolator according to any one of claims 1 to 3. The rubber elastic body is elastically deformed while the outer attachment member is connected to one of the vibration generating portion and the vibration receiving portion, and the inner attachment member is connected to the other. With the volume of the liquid chamber reduced,
5. The vibration isolator according to claim 1, wherein the first stopper portion and the second stopper portion face each other in the axial direction with the rubber elastic body interposed therebetween. The first liquid chamber, the second liquid chamber, and the communication path are formed in the rubber elastic body, and the first liquid chamber and the second liquid chamber are spaced apart in a circumferential direction around the central axis. Placed open,
The rubber elastic body includes a third stopper portion disposed on one side in the axial direction and a fourth stopper portion disposed on the other side with respect to a portion forming the partition wall of the first liquid chamber.
2. The third stopper portion protrudes from an outer peripheral surface of the inner mounting member, and the fourth stopper portion protrudes from an inner peripheral surface of the outer mounting member. 6. The vibration isolator according to any one of 5 to 5.

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