JP2017003051A - Vibration isolator - Google Patents

Abstract

PROBLEM TO BE SOLVED: To realize a constitution capable of damping and absorbing vibration in a lateral direction while improving durability and simplifying a structure.SOLUTION: A main liquid chamber 15 is provided with a partition member 24 not kept into contact with a partition wall of the main liquid chamber at least at one of both end faces in an axial direction along a center axis O of an outer attachment member 11, the partition member is fixed in a state of being axially held by an inner attachment member and a partitioning member 17 in a state that the outer attachment member is connected to one of a vibration generating portion and a vibration receiving portion, and the inner attachment member 12 is connected to the other, the main liquid chamber is partitioned into a plurality of small chambers 15a arranged in a circumferential direction along a center axis of the outer attachment member, a plurality of restriction passages 21, 22 for communicating the main liquid chamber and an auxiliary liquid chamber are formed on the partitioning member, and openings 21a, 22a at the main liquid chamber side, of the plurality of restriction passages are individually positioned on the plurality of small chambers partitioned by the partition member.SELECTED DRAWING: Figure 3

Description

  The present invention relates to a vibration isolator.

Conventionally, a cylindrical outer mounting member connected to the vibration receiving portion, an inner mounting member connected to the vibration generating portion, a first elastic body that elastically connects these both mounting members, and a first A diaphragm that is disposed apart from one side in the axial direction along the central axis of the outer mounting member with respect to the elastic body, and that defines a liquid chamber between the first elastic body and the liquid chamber, A partition member that divides the first pressure receiving liquid chamber having the elastic body as a part of the partition wall and a sub liquid chamber having the diaphragm as a part of the partition wall, and both the mounting members are elastically connected, and the first elastic body A second elastic body disposed on the other side in the axial direction, and between the first elastic body and the second elastic body, two second pressure receiving bodies having both the elastic bodies as part of the wall surface A liquid chamber is defined, a first restricting passage communicating the first pressure-receiving liquid chamber and the sub liquid chamber with the partition member; Two second limiting passage and a second pressure receiving liquid chamber and the auxiliary liquid chamber communicating with the another, the anti-vibration device formed are known for.
In this vibration isolator, when the vibration in the lateral direction orthogonal to the axial direction is input, the two second pressure receiving liquid chambers expand and contract separately, so that the liquid is separated from the two second pressure receiving liquid chambers and the sub liquid. Go to and from the room through two second restricted passages. As a result, the lateral vibration is attenuated and absorbed.

JP 2006-125617 A

  However, the conventional vibration isolator has room for improvement both in terms of improving durability and simplifying the structure.

  The present invention has been made in consideration of such circumstances, and realizes a configuration capable of attenuating and absorbing lateral vibration while improving both durability and simplifying the structure. An object of the present invention is to provide an anti-vibration device that can be used.

  In order to solve the above problems and achieve such an object, the vibration isolator of the present invention includes a cylindrical outer mounting member connected to one of a vibration generating unit and a vibration receiving unit, and An inner mounting member that is connected to the other and arranged radially inside the outer mounting member, an annular rubber elastic body that connects these two mounting members, and an inside of the outer mounting member that encloses liquid A partition member for partitioning the liquid chamber into a main liquid chamber having the rubber elastic body as a part of a partition and a sub liquid chamber along an axial direction along a central axis of the outer mounting member, and generating vibrations The rubber elastic body is elastically deformed in a state in which the outer mounting member is connected to one of the first portion and the vibration receiving portion, and the inner mounting member is connected to the other, and the inner mounting member and A vibration isolator in which the partition members approach each other in the axial direction and reduce the volume of the main liquid chamber, wherein at least one of both end surfaces in the axial direction is in the main liquid chamber. A partition member that is not in contact with the partition wall of the chamber is disposed, the outer mounting member is connected to one of the vibration generating unit and the vibration receiving unit, and the inner mounting member is connected to the other The partition member is sandwiched and fixed in the axial direction by the inner mounting member and the partition member, and a plurality of the main liquid chambers are arranged in a circumferential direction around the central axis of the outer mounting member. The partition member is formed with a plurality of restriction passages communicating the main liquid chamber and the sub liquid chamber, and the opening on the main liquid chamber side in each of the plurality of restriction passages Multiple small sections defined by members Characterized in that located separately on.

According to the present invention, the outer mounting member is connected to one of the vibration generating portion and the vibration receiving portion, and the inner mounting member is connected to the other, that is, the vibration isolator is installed in the mechanical device. In this state, the main liquid chamber is partitioned into a plurality of small chambers arranged in the circumferential direction by the partition member, so that when the vibration in the transverse direction perpendicular to the axial direction is input to the vibration isolator, the partition member is Due to the elastic displacement or elastic deformation, the plurality of small chambers expand and contract individually, so that the liquid moves between the small chambers and the sub liquid chambers individually through the plurality of restriction passages. As a result, the lateral vibration is attenuated and absorbed.
In addition, at least one of the axial end surfaces of the partition member is not in contact with the partition wall of the main liquid chamber, and the partition member is mounted on the inner side with the vibration isolator installed in the mechanical device. Since it is sandwiched and fixed in the axial direction by the member and the partition member, the complexity of the structure can be suppressed, and the both ends of the partition member in the process from the start to the completion of installation of the vibration isolator Until the surface comes into contact with both the inner mounting member and the partition member, the load acting on the partition member is eliminated, so that the partition member is hardly damaged and the durability can be improved.

  Here, the partition member may be formed of a rubber material.

  In this case, since the partition member is formed of a rubber material, the partition member is elastically deformed when the vibration in the axial direction and the vibration in the lateral direction are input to the vibration isolator. Therefore, it is possible to reliably attenuate and absorb these vibrations in both directions.

  Further, at least a part of the partition member may be fixed to the inner attachment member or the partition member.

  In this case, since at least a part of the partition member is fixed to the inner mounting member or the partition member, the position of the partition member in the main liquid chamber is easily stabilized, and the desired vibration isolation performance is stabilized. It can be demonstrated.

  According to the present invention, it is possible to realize a configuration capable of attenuating and absorbing lateral vibration while improving both durability and simplifying the structure.

It is a longitudinal section of a vibration isolator shown as one embodiment concerning the present invention. It is AA arrow sectional drawing of the vibration isolator shown in FIG. In the vibration isolator shown in FIG. 1, the volume of the main liquid chamber is reduced while the rubber elastic body is elastically deformed, and the partition member is sandwiched and fixed between the inner mounting member and the partition member.

Hereinafter, an embodiment of a vibration isolator according to the present invention will be described with reference to FIGS.
The vibration isolator 1 includes a cylindrical outer mounting member 11 connected to one of the vibration generating unit and the vibration receiving unit, an inner mounting member 12 connected to the other, and both the mounting members 11. , 12 and an annular rubber elastic body 13 that connects the liquid chamber 14 in the outer mounting member 11 in which a liquid is sealed, along the axial direction along the central axis O of the outer mounting member 11. And a partition member 17 that partitions the main liquid chamber 15 into a sub liquid chamber 16.
Hereinafter, the main liquid chamber 15 side along the axial direction with respect to the partition member 17 is referred to as the upper side, the sub liquid chamber 16 side is referred to as the lower side, and in the plan view of the vibration isolator 1 viewed from the axial direction, A direction perpendicular to the central axis O is referred to as a radial direction, and a direction around the central axis O is referred to as a circumferential direction.

  The outer mounting member 11 includes an upper cylindrical portion 11a positioned on the upper side, a lower cylindrical portion 11b having a smaller inner diameter and outer diameter than the upper cylindrical portion 11a and positioned on the lower side, an upper cylindrical portion 11a, and a lower cylindrical portion 11b. And a throttle part 11c that continuously extends over the entire circumference.

  The inner mounting member 12 is formed in a rod shape and is disposed coaxially with the central axis O. The inner mounting member 12 is disposed on the radially inner side of the outer mounting member 11. A flange portion 12 a that protrudes outward in the radial direction is formed at an intermediate position in the axial direction of the inner attachment member 12. An internal thread portion 12 b is formed on the upper end surface of the inner mounting member 12. Of the inner mounting member 12, the portion located below the flange portion 12a is gradually reduced in diameter as it goes downward. The flange portion 12 a is located above the outer mounting member 11. The lower end portion of the inner attachment member 12 is positioned below the upper end opening edge of the outer attachment member 11.

The rubber elastic body 13 gradually extends upward as it goes from the radially outer side to the inner side. The outer peripheral side of the rubber elastic body 13 is integrally vulcanized and bonded to the inner peripheral surfaces of the upper cylindrical portion 11a and the throttle portion 11c of the outer mounting member 11, and the inner peripheral side of the rubber elastic body 13 is the inner mounting member. 12 is vulcanized and bonded to the outer peripheral surface of the portion located below the flange portion 12a. The upper end opening of the outer mounting member 11 is sealed by the rubber elastic body 13. An inner ring 31 disposed between the outer mounting member 11 and the inner mounting member 12 is embedded in the rubber elastic body 13.
Here, the inner mounting member 12 is provided with a stopper rubber 32 that integrally covers the upper surface, the lower surface, and the outer peripheral surface of the flange portion 12 a, and the stopper rubber 32 is formed integrally with the rubber elastic body 13.

A tubular diaphragm ring 18 is liquid-tightly fitted in the lower end portion of the outer mounting member 11. An outer peripheral portion of a diaphragm 19 formed of a rubber material or the like so as to be elastically deformable is vulcanized and bonded to the inner peripheral surface of the diaphragm ring 18. The diaphragm ring 18 is fixed by caulking the lower end portion of the outer mounting member 11 toward the inner side in the radial direction. The lower end opening of the outer mounting member 11 is sealed by the diaphragm 19.
The diaphragm 19, the rubber elastic body 13, and the outer mounting member 11 define a liquid chamber 14 in which liquid is enclosed. Examples of the liquid include water and ethylene glycol.

  The partition member 17 is formed in a flat disk shape, is fitted in the outer mounting member 11, and is sandwiched in the axial direction by the throttle portion 11 c of the outer mounting member 11 and the diaphragm ring 18. As a result, the liquid chamber 14 in the outer mounting member 11 includes a main liquid chamber 15 defined by the rubber elastic body 13 and the partition member 17, and a sub liquid chamber 16 defined by the diaphragm 19 and the partition member 17. It is divided into and. The diaphragm 19 expands and contracts as the liquid flows into and out of the sub liquid chamber 16.

In the above configuration, the vibration isolator 1 is a compression type (upright type) that is attached and used so that the main liquid chamber 15 is positioned on the upper side in the vertical direction and the sub liquid chamber 16 is positioned on the lower side in the vertical direction. It becomes the composition of.
In addition, the outer mounting member 11 is connected to one of the vibration generating unit and the vibration receiving unit, and the inner mounting member 12 is connected to the other, and the vibration isolator 1 is installed in the mechanical device. While the rubber elastic body 13 is elastically deformed, the inner mounting member 12 and the partition member 17 approach each other in the axial direction, and the volume of the main liquid chamber 15 is reduced.
For example, when the vibration isolator 1 is installed in an automobile, the inner attachment member 12 is connected to an engine or the like as a vibration generating portion by screwing a bolt into the female screw portion 12b, while the outer attachment member 11 is connected. Is connected to a vehicle body or the like as a vibration receiving portion via a bracket (not shown).

In the present embodiment, the main liquid chamber 15 is provided with a partition member 24 in which at least one of both end surfaces in the axial direction is not in contact with the partition wall of the main liquid chamber 15.
The partition member 24 is formed in a plate shape extending along the radial direction. The partition member 24 extends continuously over the entire length in one direction in the radial direction of the main liquid chamber 15. The partition member 24 protrudes downward from the inner mounting member 12 and the rubber elastic body 13. Thereby, the upper end surface of the partition member 24 is fixed to the inner mounting member 12 and the rubber elastic body 13, and the lower end surface of the partition member 24 is not in contact with the partition wall of the main liquid chamber 15. Of the upper end surface of the partition member 24, the central portion in the radial direction is fixed to the lower end surface of the inner mounting member 12, and the portion located on the outer side in the radial direction from the lower end surface of the inner mounting member 12 is the rubber elastic body 13. Of the surface, it is fixed to the lower surface that faces downward and defines a part of the main liquid chamber 15. The lower end surface of the partition member 24 is a flat surface, and the position along the axial direction is the same over the entire region. The partition member 24 is formed of a rubber material and is formed integrally with the rubber elastic body 13.

In the above configuration, with the vibration isolator 1 installed in the mechanical device as described above, the partition member 24 is moved in the axial direction by the inner mounting member 12 and the partition member 17 as shown in FIG. The main liquid chamber 15 is sandwiched and fixed, and is divided into a plurality of small chambers 15a arranged in the circumferential direction.
In the illustrated example, when the vibration isolator 1 is installed in an automobile, a load of the engine or the like is applied to the vibration isolator 1 from the inner mounting member 12 side in the axial direction, so that the rubber elastic body 13 The chamber 15 is elastically deformed to reduce the volume. At this time, the main liquid chamber 15 is partitioned into a plurality of small chambers 15 a by the lower end surface of the partition member 24 being in contact with the upper surface of the partition member 17. In the illustrated example, the main liquid chamber 15 is divided into two in the radial direction by the partition member 24 in the other direction orthogonal to the one direction. Thus, the internal volumes and shapes of the two small chambers 15a defined by dividing the main liquid chamber 15 into two are equal to each other.

Here, in the present embodiment, the partition member 17 is formed with a plurality of restriction passages 21 and 22 that communicate the main liquid chamber 15 and the sub liquid chamber 16. The openings 21 a and 22 a on the main liquid chamber 15 side in the restriction passages 21 and 22 are respectively located in the plurality of small chambers 15 a partitioned by the partition member 24.
In the illustrated example, two restriction passages 21 and 22 are formed in the partition member 17. The openings 21a and 22a on the main liquid chamber 15 side in the restricting passages 21 and 22 are respectively arranged at positions opposite to each other with the central axis O in the radial direction at the outer peripheral edge portion on the upper surface of the partition member 17. Yes. Further, the openings 21b and 22b on the side of the sub liquid chamber 16 in the restricting passages 21 and 22 are separately arranged at positions opposite to each other across the central axis O in the radial direction on the outer peripheral edge of the lower surface of the partition member 17. Has been. Each of the restriction passages 21 and 22 extends on the outer peripheral surface of the partition member 17 by about 180 ° around the central axis O.

As described above, according to the vibration isolator 1 according to the present embodiment, as described above, the plurality of small chambers 15a in which the main liquid chamber 15 is arranged in the circumferential direction by the partition member 24 in a state of being installed in the mechanical device. Therefore, when a vibration in the transverse direction perpendicular to the axial direction is input to the vibration isolator 1, the partition member 24 is elastically displaced or elastically deformed, and the plurality of small chambers 15a are expanded and contracted individually. As a result, the liquid flows between the small chambers 15a and the sub liquid chambers 16 through the plurality of restricting passages 21 and 22, respectively. As a result, the lateral vibration is attenuated and absorbed.
In addition, the partition member 24 is not in contact with the partition wall of the main liquid chamber 15 and the vibration isolation device 1 is installed in the mechanical device, and the partition member 24 is connected to the inner mounting member 12 and the partition member 17. Therefore, it is possible to suppress the complexity of the structure, and in the process from the start to the completion of the installation of the vibration isolator 1, the lower end surface of the partition member 24 is partitioned. Until the contact with the upper surface of the member 17, the load acting on the partition member 24 is eliminated, so that the partition member 24 is hardly damaged and durability can be improved.

Further, since the partition member 24 is formed of a rubber material, the partition member 24 is elastic when the vibration in the axial direction is input to the vibration isolator 1 and when the vibration in the lateral direction is input. It becomes possible to deform, and the vibrations in both directions can be reliably damped and absorbed.
Further, since the upper end surface of the partition member 24 is fixed to the inner mounting member 12, the position of the partition member 24 in the main liquid chamber 15 is easily stabilized, and the desired vibration isolation performance is stably exhibited. Can be made.

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

For example, in the said embodiment, although the structure formed integrally with the rubber elastic body 13 was shown as the division member 24, you may form a division member separately from the rubber elastic body 13, and a rubber material Instead of, for example, a resin material or a metal material may be used. When the partition member is formed of a metal material or a hard resin material, the partition member may be elastically displaced by sliding on the upper surface of the partition member 17 when the lateral vibration is input. .
Further, the partition member may protrude from the partition member 17 upward and be fixed to the partition member 17.
In addition, the partition members may be disposed on both the inner attachment member 12 and the partition member 17, and the partition members may be abutted in the axial direction in a state where the vibration isolator is installed in the mechanical device.
In addition, the partition member may be disposed on any one of the inner attachment member 12 and the partition member 17, and a recess portion into which the partition member is fitted may be formed on the other.
Further, both end surfaces in the axial direction as the partitioning members are not in contact with the lower end surface of the inner mounting member 12 and the upper surface of the partition member 17, and are positioned radially outside the lower end surface of the inner mounting member 12. A configuration in which a portion to be fixed to the rubber elastic body 13 may be employed.

Further, the number of the small chambers 15a is not limited to two and may be changed as appropriate.
Further, the internal volumes and shapes of the plurality of small chambers 15a may be different from each other.
Alternatively, a plurality of sub liquid chambers may be provided, and each sub liquid chamber and the plurality of small chambers 15a may be communicated with each other through a plurality of restricted passages.

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

DESCRIPTION OF SYMBOLS 1 Anti-vibration device 11 Outer attachment member 12 Inner attachment member 13 Rubber elastic body 14 Liquid chamber 15 Main liquid chamber 15a Small chamber 16 Sub liquid chamber 17 Partition member 21, 22 Restriction passage 21a, 22a Opening 24 Partition member O Center axis

Claims (3)

A cylindrical outer mounting member connected to any one of the vibration generating portion and the vibration receiving portion, and an inner mounting member connected to the other and disposed radially inside the outer mounting member;
A ring-shaped rubber elastic body for connecting these two mounting members;
The liquid chamber in the outer mounting member in which the liquid is sealed is divided into a main liquid chamber and a sub liquid chamber in which the rubber elastic body is a part of the partition wall along the axial direction along the central axis of the outer mounting member. A partition member for partitioning,
While the rubber elastic body is elastically deformed in a state where the outer mounting member is connected to one of the vibration generating unit and the vibration receiving unit and the inner mounting member is connected to the other, the inner mounting is performed. A vibration isolator in which a member and the partition member approach each other in the axial direction to reduce the volume of the main liquid chamber,
In the main liquid chamber, a partition member in which at least one of both end faces in the axial direction is not in contact with the partition wall of the main liquid chamber is disposed,
In a state where the outer mounting member is connected to one of the vibration generating unit and the vibration receiving unit, and the inner mounting member is connected to the other, the partition member includes the inner mounting member and the partition member. The main liquid chamber is fixed by being sandwiched in the axial direction by a plurality of small chambers arranged in a circumferential direction along the central axis of the outer mounting member,
The partition member is formed with a plurality of restriction passages communicating the main liquid chamber and the sub liquid chamber.
The opening on the main liquid chamber side in each of the plurality of restriction passages is located in a plurality of small chambers partitioned by the partition member, respectively.   The vibration isolator according to claim 1, wherein the partition member is made of a rubber material.   The vibration isolator according to claim 1 or 2, wherein at least a part of the partition member is fixed to the inner mounting member or the partition member.

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