JP6619695B2 - Vibration isolator - Google Patents

Description

  The present invention relates to a vibration isolator.

  Conventionally, a cylindrical first mounting member connected to one of the vibration generating portion and the vibration receiving portion, and a first mounting member connected to the other and disposed radially inside the first mounting member. 2 mounting members, an elastic body in which the first mounting member and the second mounting member are connected, and a liquid chamber in the first mounting member is divided into a main liquid chamber and a sub liquid chamber having the elastic body as a part of a partition wall. An anti-vibration device is known in which a partition wall that partitions the main liquid chamber is formed integrally with an elastic body.

JP 2012-247016 A

  However, in the conventional vibration isolator, the partition wall that divides the main liquid chamber into a plurality of parts is formed in an elastic body to which a large load is applied. Propagates to the partition wall, and there is a possibility that liquid leakage may occur between the main liquid chambers divided into a plurality through the crack.

  This invention is made in view of such a situation, and it aims at providing the vibration isolator which can suppress that a crack arises in a division wall.

  In order to solve the above-described problems and achieve such an object, the vibration isolator of the present invention includes a cylindrical first mounting member coupled to one of a vibration generating unit and a vibration receiving unit, And a second mounting member that is connected to the other and arranged radially inside the first mounting member, an elastic body that connects the first mounting member and the second mounting member, and the first A partition member that divides the liquid chamber in the mounting member into a main liquid chamber and a sub liquid chamber in which the elastic body is a part of the partition wall, and the partition member includes the second mounting member or the elastic member. And an elastic plate that is disposed opposite the axial direction along the central axis of the first mounting member and that forms part of the partition wall of the main liquid chamber, and the elastic plate includes the second plate Projecting toward the mounting member or the elastic body, the main liquid chamber is divided into the first main liquid chamber and the second main liquid chamber. A partition wall that is divided into a liquid chamber is formed, and the partition member includes a first orifice passage that communicates the first main liquid chamber and the sub liquid chamber, the second main liquid chamber, and the sub liquid chamber. And a second orifice passage communicating with each other.

According to this invention, the partition wall that partitions the main liquid chamber into the first main liquid chamber and the second main liquid chamber is formed on the elastic plate of the partition member, and the partition wall and the elastic body are separate members. Therefore, even when a part of the elastic body is cracked when using the vibration isolator, it is possible to prevent the crack from propagating to the partition wall. The attenuation characteristic can be exhibited stably.
Further, since the partition wall and the elastic body are separate members, for example, the partition wall and the elastic body can be formed of different materials. For this reason, for example, the partition wall can be designed with a high degree of freedom in accordance with the required specifications of the vibration isolator, for example, the partition wall has a certain rigidity and the elastic body has a flexibility.

  Here, a diaphragm forming a part of the partition wall of the sub liquid chamber may be provided, and the elastic plate and the diaphragm may be integrally formed.

  In this case, since the diaphragm forming a part of the partition wall of the sub liquid chamber is formed integrally with the elastic plate, when the vibration isolator is manufactured, the elastic plate and the diaphragm are used as a single part with a single mold. Can be molded integrally. Thereby, cost can be reduced as compared with a case where the elastic plate and the diaphragm are configured separately.

  The diaphragm may be disposed radially outside the elastic plate, and the secondary liquid chamber may be formed in an annular shape.

  In this case, since the secondary liquid chamber is formed in an annular shape by the diaphragm disposed on the outer side in the radial direction from the elastic plate, it is easy to deform the diaphragm toward the inner side in the radial direction when the secondary liquid chamber expands. And it becomes possible to suppress the deformation | transformation to the axial direction of a diaphragm, and can improve space efficiency. Furthermore, since the diaphragm is disposed on the outer side in the radial direction from the elastic plate, it is possible to suppress a decrease in the internal volume of the sub liquid chamber due to the annular formation of the sub liquid chamber.

  The partition wall may contact the second mounting member or the elastic body in the axial direction.

  In this case, since the partition wall protruding toward the second mounting member or the elastic body is in contact with the second mounting member or the elastic body in the axial direction, one of the vibration generating portion and the vibration receiving portion is the first. By connecting the mounting member and connecting the second mounting member to the other, when the axial compression load is applied to the vibration isolator, the partition wall is pressed against the second mounting member or the elastic body, It is in a pre-compressed state in the axial direction. For this reason, when vibration is applied to the vibration isolator, the second attachment member or the elastic body and the partition wall are not separated from each other in the axial direction, and it is easy to maintain a contact state. Thereby, it becomes easy to ensure the liquid tightness of the first main liquid chamber and the second main liquid chamber by the partition wall, and the damping characteristic that is expected of the vibration isolator can be more stably exhibited.

  According to this invention, it can suppress that a crack arises in a partition wall.

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.

Hereinafter, an embodiment of a vibration isolator 1 according to the present invention will be described with reference to FIGS. 1 and 2.
As shown in FIG. 1, the vibration isolator 1 includes a cylindrical first mounting member 10 connected to one of a vibration generating unit and a vibration receiving unit, and a second mounting member 20 connected to the other. The elastic body 30 connecting the first mounting member 10 and the second mounting member 20, the liquid chamber 70 in the first mounting member 10, the main liquid chamber 71 having the elastic body 30 as a part of the partition wall, and And a partition member 40 partitioned into a liquid chamber 72.
Hereinafter, the direction along the central axis O of the first mounting member 10 is referred to as an axial direction, and the main liquid chamber 71 side is referred to as an upper side and the auxiliary liquid chamber 72 side is referred to as a lower side in the axial direction. Further, in a plan view of the vibration isolator 1 viewed from the axial direction, a direction orthogonal 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 first mounting member 10 includes an upper cylinder portion 11 located on the upper side, an inner diameter and an outer diameter slightly larger than the upper cylinder portion 11, and a lower cylinder portion 12 located on the lower side, an upper cylinder portion 11 and a lower cylinder. And a throttle part 13 that is connected to the part 12 and extends continuously over the entire circumference. The narrowed portion 13 is formed in a groove shape that is recessed toward the inside in the radial direction and continuously extends over the entire circumference. A thin film-like seal member 14 is disposed on the inner peripheral surface of the lower cylinder portion 12 in the first mounting member 10. The seal member 14 is formed of an elastic material such as rubber.
A liquid chamber 70 in which a liquid is sealed is defined in the first mounting member 10. Examples of the liquid include water and ethylene glycol.

  The second mounting member 20 is formed in a rod shape and is disposed coaxially with the central axis O. A flange portion 21 that protrudes outward in the radial direction is formed at an intermediate position in the axial direction of the second mounting member 20. A female screw portion 20 a is formed on the upper end surface of the second mounting member 20. A portion of the second mounting member 20 located below the flange portion 21 is gradually reduced in diameter as it goes downward. The lower end surface of the second mounting member 20 is formed in a curved shape that protrudes downward. The flange portion 21 is located above the first mounting member 10. The axial positions of the lower end edge of the second attachment member 20 and the upper end opening edge of the first attachment member 10 are equal to each other.

The elastic body 30 gradually extends upward as it goes from the radially outer side to the inner side. The elastic body 30 is disposed coaxially with the central axis O. The lower end portion of the elastic body 30 is integrally vulcanized and bonded to the inner peripheral surfaces of the upper cylinder portion 11 and the throttle portion 13 of the first mounting member 10. The upper end portion of the elastic body 30 is vulcanized and bonded to the outer peripheral surface of a portion of the second mounting member 20 located below the flange portion 21. Of the elastic body 30, the inner surface 30 a facing the inner side of the elastic body 30 is formed in a concave curved shape that is recessed upward.
The elastic body 30 covers the lower end surface of the second mounting member 20 over the entire area. Note that the lower end surface of the second mounting member 20 may not be covered by the elastic body 30 over the entire area. The upper end opening of the first mounting member 10 is sealed by the elastic body 30.

Here, the second mounting member 20 is provided with a stopper rubber 22 that integrally covers the upper surface, the lower surface, and the outer peripheral surface of the flange portion 21, and the stopper rubber 22 is formed integrally with the elastic body 30. The stopper rubber 22 is vulcanized and bonded to the upper surface, the lower surface, and the outer peripheral surface of the flange portion 21.
The elastic body 30 is formed integrally with the seal member 14, and the inner peripheral surface of the first mounting member 10 is covered over the entire area by the elastic body 30 and the seal member 14. In the illustrated example, the elastic body 30 is formed of the same material as the seal member 14. The elastic body 30 and the seal member 14 may be separate from each other or may be formed of different materials.

  The partition member 40 is formed in a top cylinder shape. The partition member 40 is disposed coaxially with the central axis O. The partition member 40 is fitted into the lower cylinder portion 12 of the first attachment member 10 via the seal member 14. The partition member 40 is disposed so as to face the elastic body 30 in the axial direction, and is disposed on the outer side in the radial direction of the elastic plate 41 and an elastic plate (membrane) 41 that forms a part of the partition wall of the main liquid chamber 71. And a cylindrical orifice member 42 in which a plurality of orifice passages 42a and 42b are formed.

  The elastic plate 41 is formed in a circular shape and is disposed coaxially with the central axis O. The outer peripheral surface of the elastic plate 41 is vulcanized and bonded to the inner peripheral surface of the orifice member 42. The elastic plate 41 is disposed in the upper end portion of the orifice member 42. The elastic plate 41 is formed of a rubber material having a higher elastic modulus than the elastic body 30. The lower surface of the elastic plate 41 is exposed to the outside of the vibration isolator 1 and is in contact with the outside air. The upper surface of the elastic plate 41 is located above the upper end opening edge of the orifice member 42.

The orifice member 42 is disposed coaxially with the central axis O. The orifice member 42 is made of a resin material, an aluminum alloy, or the like.
The partition member 40 is opposed to the second mounting member 20 and the elastic body 30 in the axial direction. In the illustrated example, the partition member 40 faces the lower end surface of the second mounting member 20 in the axial direction via the elastic body 30.

A diaphragm 50 is disposed at the lower end of the first mounting member 10. The diaphragm 50 is disposed on the outer side in the radial direction from the elastic plate 41, has a thin film shape thinner than the elastic plate 41, and is formed in an annular shape having a curved surface protruding downward. The diaphragm 50 is lower in rigidity than the elastic plate 41. The diaphragm 50 is disposed coaxially with the central axis O.
Both the inner peripheral portion 51 and the outer peripheral portion 52 of the diaphragm 50 gradually extend inward in the radial direction as they go downward. The lower end portions of the inner peripheral portion 51 and the outer peripheral portion 52 are connected by a curved portion 53 that protrudes downward.

The outer peripheral portion 52 of the diaphragm 50 is vulcanized and bonded to an annular metal plate 60 fitted in the first mounting member 10. By deforming the lower end portion of the first attachment member 10 inward in the radial direction, the lower end portion of the first attachment member 10 caulks and fixes the metal plate 60.
Each upper end portion of the inner peripheral portion 51 and the outer peripheral portion 52 is disposed at the lower end opening edge of the orifice member 42. The upper end portion of the outer peripheral portion 52 is in close contact with the lower end opening edge of the orifice member 42. Of the inner peripheral portion 51, the upper end portion is thicker in the radial direction than the other portions. The upper end portion of the inner peripheral portion 51 is vulcanized and bonded to the lower end opening edge of the orifice member 42.

  Here, the diaphragm 50 and the elastic plate 41 are connected via the connection member 43. The connecting member 43 is formed in a cylindrical shape arranged coaxially with the central axis O. The upper end portion of the connection member 43 is connected to the outer peripheral edge portion of the elastic plate 41, and the lower end portion of the connection member 43 is connected to the upper end portion of the inner peripheral portion 51 of the diaphragm 50. The outer peripheral surface of the connection member 43 is vulcanized and bonded to the inner peripheral surface of the orifice member 42.

  In the illustrated example, the elastic plate 41, the connecting member 43, and the diaphragm 50 are integrally formed of the same rubber material. This rubber material is a material with excellent ozone resistance that suppresses deterioration over time due to contact with outside air. This rubber material is harder than the rubber material forming the elastic body 30. Note that at least one of the elastic plate 41, the connection member 43, and the diaphragm 50 may be formed separately.

  Here, the liquid chamber 70 in the first mounting member 10 is partitioned by the partition member 40 into a main liquid chamber 71 located above and a sub liquid chamber 72 located below. The main liquid chamber 71 is defined by the elastic body 30, the elastic plate 41, and the orifice member 42. The secondary liquid chamber 72 is defined by the diaphragm 50 and the orifice member 42. The secondary liquid chamber 72 is formed in an annular shape that extends continuously over the entire circumference. The diaphragm 50 expands and contracts as the liquid flows into and out of the sub liquid chamber 72.

In this embodiment, the elastic plate 41 is formed with a partition wall 41a that protrudes toward the elastic body 30 and divides the main liquid chamber 71 into a first main liquid chamber 71a and a second main liquid chamber 71b. Yes. The partition wall 41a is formed in a plate shape extending along the radial direction. The partition wall 41a extends continuously over the entire length in one direction in the radial direction of the main liquid chamber 71.
The upper end surface of the partition wall 41a is formed in a protruding curved shape that goes downward along the inner surface 30a of the elastic body 30 from the radial center to the outer side.
As shown in FIG. 1, a protruding portion 41b that protrudes upward is formed at the center in the width direction of the upper end surface of the partition wall 41a. The partition wall 41 a is formed integrally with the elastic plate 41 by the same rubber material as the elastic plate 41.

In the present embodiment, the partition wall 41a is in contact with the elastic body 30 in the axial direction. The partition wall 41a is in contact with the elastic body 30 continuously over the entire length in the one direction. The protrusion 41b of the partition wall 41a is compressed and deformed in the axial direction, and the upper end surface of the partition wall 41a is flat.
The partition wall 41a may be in contact with the second mounting member 20 or may be in contact with the elastic body 30 or the second mounting member 20 without being compressively deformed in the axial direction.

In the above configuration, the vibration isolator 1 is a compression type (upright type) configuration that is attached and used so that the main liquid chamber 71 is positioned above and the sub liquid chamber 72 is positioned below. Yes.
That is, when the first mounting member 10 is connected to one of the vibration generating unit and the vibration receiving unit and the second mounting member 20 is connected to the other, the vibration isolator 1 can be used as a machine such as an automobile. It will be in the state installed in the apparatus.

For example, a bolt is screwed to the female threaded portion 20a of the second mounting member 20 to be connected to an engine or the like as a vibration generating unit, while the first mounting member 10 is connected to a vibration receiving unit via a bracket (not shown). Connected to the vehicle body or the like.
At this time, the elastic body 30 is elastically deformed by the load of the engine or the like, and the first mounting member 10 and the second mounting member 20 approach each other in the axial direction, and the volume of the main liquid chamber 71 is reduced. In addition, the partition wall 41a of the elastic plate 41 is in pressure contact with the elastic body 30 and is pre-compressed in the axial direction.

  Here, in the present embodiment, as shown in FIG. 1, the first orifice passage 42 a communicating the first main liquid chamber 71 a and the sub liquid chamber 72 with the orifice member 42 in the partition member 40, and the second main liquid chamber A second orifice passage 42b that communicates 71b and the auxiliary liquid chamber 72 is formed. In the illustrated example, a first orifice passage 42 a and a second orifice passage 42 b are formed on the outer peripheral surface of the orifice member 42.

The flow resistance of the liquid in each of the first orifice passage 42a and the second orifice passage 42b is different from each other.
The first orifice passage 42a is connected to the first passage extending from the upper end opening edge of the orifice member 42 toward the central portion in the axial direction of the orifice member 42 and the lower end portion of the first passage, and is directed to one side in the circumferential direction. And a third passage that is connected to an end portion on one side in the circumferential direction of the second passage and reaches the lower end opening edge of the orifice member 42. The flow passage cross-sectional areas in the first passage, the second passage, and the third passage are equal to each other.
The second orifice passage 42b extends straight in the axial direction. The flow passage cross-sectional area of the second orifice passage 42b is larger than the flow passage cross-sectional area of the first orifice passage 42a.

When vibration from the vibration generating unit 1 is applied to the vibration isolator 1, the main liquid chamber is caused by, for example, relative displacement between the first mounting member 10 and the second mounting member 20, elastic deformation of the elastic body 30, or the like. 71 is expanded and contracted, and the volume in the main liquid chamber 71 increases or decreases. At this time, the liquid flows between the main liquid chamber 71 and the sub liquid chamber 72 through the first orifice passage 42a and the second orifice passage 42b, and liquid column resonance occurs in the first orifice passage 42a or the second orifice passage 42b. Occurs. Thereby, the vibration of the frequency equivalent to the resonant frequency of the 1st orifice channel | path 42a or the 2nd orifice channel | path 42b is absorbed and attenuated.
Here, since the flow resistances of the first orifice passage 42a and the second orifice passage 42b are different from each other, the resonance frequencies in the first orifice passage 42a and the second orifice passage 42b are different from each other, and the attenuation characteristics are reduced. The frequency band to be exhibited can be expanded.

  As described above, according to the vibration isolator 1 of the present embodiment, the partition wall 41a that partitions the main liquid chamber 71 into the first main liquid chamber 71a and the second main liquid chamber 71b is the elasticity of the partition member 40. It is formed on the plate 41, and the partition wall 41a and the elastic body 30 are separate members. For this reason, even if a crack occurs in a part of the elastic body 30 when the vibration isolator 1 is used, it is possible to prevent the crack from propagating to the partition wall 41a. It is possible to stably exhibit the attenuation characteristics.

Moreover, since the partition wall 41a and the elastic body 30 are separate members, the partition wall 41a and the elastic body 30 can be formed of different rubber materials. For this reason, for example, the partition wall 41a can be designed with a high degree of freedom according to the required specifications of the vibration isolator 1 such that the elastic body 30 has a certain rigidity while the partition wall 41a has a certain rigidity.
In addition, since the diaphragm 50 forming a part of the partition wall of the sub liquid chamber 72 is formed integrally with the elastic plate 41, the elastic plate 41 and the diaphragm 50 are used as a single component when the vibration isolator 1 is manufactured. It can be formed integrally with a single mold. Thereby, cost reduction is possible compared with the case where the elastic board 41 and the diaphragm 50 are comprised separately.

  Further, since the sub liquid chamber 72 is formed in an annular shape by the diaphragm 50 disposed on the outer side in the radial direction from the elastic plate 41, when the sub liquid chamber 72 expands, the diaphragm 50 is directed inward in the radial direction. Therefore, the diaphragm 50 can be prevented from being deformed in the axial direction, and the space efficiency can be improved. Furthermore, since the diaphragm 50 is disposed on the outer side in the radial direction from the elastic plate 41, a decrease in the internal volume of the sub liquid chamber 72 due to the sub liquid chamber 72 being formed in an annular shape can be suppressed.

  Further, since the partition wall 41a protruding toward the elastic body 30 is in contact with the elastic body 30 in the axial direction, the first mounting member 10 is connected to one of the vibration generating portion and the vibration receiving portion, and By connecting the second mounting member 20 to the other side, when an axial compressive load is applied to the vibration isolator 1, the partition wall 41a comes into pressure contact with the elastic body 30 and is pre-compressed in the axial direction. . For this reason, when vibration is applied to the vibration isolator 1, the elastic body 30 and the partition wall 41a are easily maintained in contact with each other without being separated from each other in the axial direction. Thereby, it becomes easy to ensure the liquid tightness of the first main liquid chamber 71a and the second main liquid chamber 71b by the partition wall 41a, and the damping characteristic intended for the vibration isolator 1 can be more stably exhibited. .

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

For example, in the above embodiment, the configuration in which the elastic plate 41 is formed integrally with the diaphragm 50 that forms a part of the partition wall of the sub liquid chamber 72 is shown, but the present invention is not limited to this configuration. The elastic plate may be formed separately from the diaphragm.
Moreover, in the said embodiment, although the diaphragm 50 was arrange | positioned on the outer side of radial direction rather than the elastic board 41, and the subliquid chamber 72 was formed cyclically | annularly, it was not restricted to such an aspect. The diaphragm may not be disposed on the outer side in the radial direction than the elastic plate, and the sub liquid chamber may be formed in a bowl shape or the like, for example. In such a case, the lower surface of the elastic plate may be a part of the partition wall of the sub liquid chamber without contacting the atmosphere.

Moreover, in the said embodiment, although the auxiliary | assistant liquid chamber 72 was formed cyclically | annularly and showed the structure connected over the perimeter, it is not restricted to such an aspect. The sub liquid chamber may be divided into two in the circumferential direction corresponding to, for example, the first main liquid chamber and the second main liquid chamber.
Moreover, in the said embodiment, although each flow resistance of the 1st orifice channel | path 42a and the 2nd orifice channel | path 42b showed the mutually different structure, it is not restricted to such an aspect. The flow resistances of the first orifice passage and the second orifice passage may be equal to each other.

  Moreover, in the said embodiment, although the partition wall 41a showed the structure which contact | abutted the 2nd attachment member 20 or the elastic body 30, and the axial direction, it is not restricted to such an aspect. The partition wall may not be in contact with the second attachment member or the elastic body. In this case, when the first mounting member is connected to one of the vibration generating unit and the vibration receiving unit and the second mounting member is connected to the other, the partition wall is not attached to the second mounting member or the elastic member. The partition wall may be in contact with the second attachment member or the elastic body by applying external vibration.

  Moreover, in the said embodiment, although the partition wall 41a showed about the structure which partitions the main liquid chamber 71 into the 1st main liquid chamber 71a and the 2nd main liquid chamber 71b, it is not restricted to such an aspect. . The partition wall may partition the main liquid chamber into three or more liquid chambers. In such a case, three or more orifice passages may be provided for each of the three or more liquid chambers.

  In addition, it is possible to replace the constituent elements in the above-described embodiments with known constituent elements in a timely manner without departing from the spirit of the present invention.

DESCRIPTION OF SYMBOLS 1 Vibration isolator 10 1st attachment member 20 2nd attachment member 30 Elastic body 40 Partition member 41 Elastic board 41a Partition wall 42a 1st orifice passage 42b 2nd orifice passage 50 Diaphragm 70 Liquid chamber 71 Main liquid chamber 71a 1st main liquid Chamber 71b Second main liquid chamber 72 Sub liquid chamber

Claims (4)

A cylindrical first mounting member connected to one of the vibration generating unit and the vibration receiving unit, and a second mounting connected to the other and disposed radially inside the first mounting member Members,
An elastic body connecting the first mounting member and the second mounting member;
A partition member that divides the liquid chamber in the first mounting member into a main liquid chamber and a sub liquid chamber in which the elastic body is part of a partition;
The partition member is disposed so as to face the second mounting member or the elastic body in the axial direction along the center axis of the first mounting member, and forms a part of the partition wall of the main liquid chamber. A board is provided,
The elastic plate is formed with a partition wall that protrudes toward the second mounting member or the elastic body and divides the main liquid chamber into a first main liquid chamber and a second main liquid chamber,
The partition member includes a first orifice passage that communicates the first main liquid chamber and the sub liquid chamber, and a second orifice passage that communicates the second main liquid chamber and the sub liquid chamber. An anti-vibration device characterized by that. Comprising a diaphragm forming a part of the partition wall of the sub liquid chamber;
The vibration isolator according to claim 1, wherein the elastic plate and the diaphragm are integrally formed.   3. The vibration isolator according to claim 2, wherein the diaphragm is disposed radially outside the elastic plate, and the sub liquid chamber is formed in an annular shape.   The vibration isolator according to any one of claims 1 to 3, wherein the partition wall is in contact with the second mounting member or the elastic body in an axial direction.

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