JP2000274480A - Fluid sealed vibration isolating device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To ensure the high degree of tuning of a first and second orifice passages and to stably dispose a moving rubber film for limiting a fluid flow amount on the second orifice passage tuned to the high frequency side. SOLUTION: A first partition body 56 and a second partitioning body 58 are securely press fitted and fixed each other to form a partition member 48, and an annular plate member 84 fixed at the outer peripheral edge part of a moving rubber film 60 is nipped between the first partition body 56 and the second partition body 58. The moving rubber film 60 is disposed elastically deformably by a given amount between the first and second partitioning bodies 56 and 58. A second orifice passage 104 is formed between the overlapping surfaces of the annular plate member 84 and the first partition body 56 and/or the second partition body 58 in a form that the outer peripheral side of the moving rubber film 60 is extended in a peripheral direction.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a fluid-filled type vibration damping device that obtains a vibration damping effect based on a flow action of an incompressible fluid sealed therein, and more particularly to a fluid-filled vibration damping device tuned to different frequency ranges. The present invention relates to a fluid filled type vibration damping device having both one orifice passage and a second orifice passage.

[0002]

2. Description of the Related Art Conventionally, as a kind of a vibration-proof connecting body or a vibration-proof supporting body interposed between members constituting a vibration transmission system, a first mounting member is conventionally provided with a second mounting member having a substantially cylindrical shape. The first mounting member and the second mounting member are connected to each other by an elastic body at the one axial side of the member, and the first mounting member and the second mounting member are connected to one axial side of the second mounting member. The main body rubber elastic body and the flexible membrane are covered by fluid-tightly covering the opening side of the second mounting member while covering the other opening side in the axial direction of the second mounting member with a flexible film that is easily deformable. A fluid chamber in which an incompressible fluid is sealed is formed between the fluid chambers, and a partition member is housed and arranged inside the fluid chamber to partition the fluid chamber on both sides in the axial direction. A pressure receiving chamber composed of a main body rubber elastic body and an equilibrium chamber having a part of a wall portion composed of the flexible film are provided. And forming on both sides of members, fluid-filled vibration damping device provided with an orifice passage communicating with each other equilibrium chamber with pressure receiving chamber is known. According to such a fluid-filled type vibration damping device, a vibration damping effect that cannot be obtained only with the rubber elastic body can be easily obtained based on the resonance action of the fluid flowing through the orifice passage. Application to engine mounts, body mounts, etc. is being studied.

In such a vibration isolator, it is extremely difficult to obtain a vibration isolating effect based on the fluid flow action over a wide frequency range or a plurality of frequency ranges, and the orifice passage is tuned. It was difficult to obtain an effective vibration damping effect against vibrations outside the frequency range. In view of such a problem, Japanese Patent Laid-Open No. 57-934 has been proposed.
No. 0 and Japanese Utility Model Publication No. 60-61359,
The partition member is composed of two partition plates superimposed on each other, and a first orifice passage extending circumferentially between the overlapping surfaces of the two partition plates is formed at an outer peripheral portion of the partition member, In the central portion of the member, a hollow cavity is formed which extends between the two overlapping partition plates and communicates with the pressure receiving chamber and the equilibrium chamber through a through hole provided in each partition plate. A structure in which a movable rubber film is accommodated and arranged so as to be displaceable or deformable by a predetermined amount has been proposed. In the vibration damping device having such a structure, when a low-frequency large-amplitude vibration is input, the fluid flow through the through hole is blocked by the movable rubber film, so that the vibration damping effect based on the fluid flow through the first orifice passage is effective. On the other hand, when high-frequency small-amplitude vibration is input, the flow resistance of the first orifice passage increases and the first orifice passage becomes substantially closed, and the vibration-proof effect based on the fluid flow through the through hole is effectively exhibited. It is.

However, when such a partition member is employed, the two partition plates and the movable rubber film constituting the partition member are attached to the second mounting member in an incompressible fluid when manufacturing the vibration isolator. On the other hand, it is necessary to assemble them separately, and there is a problem that the manufacturing operation is troublesome. The two partition plates are fixed in advance with the movable rubber film incorporated therein using a fixing member such as welding or a rivet, and the assembled component is assembled to the second mounting member in an incompressible fluid. However, in that case, there is a problem that, in addition to the necessity of a special fixing member, the fixing work by welding, rivet or the like is troublesome.

Further, in order to tune the vibration damping effect based on the fluid flow through the through-hole in accordance with the required high-frequency vibration, it is necessary to adjust the flow path cross-sectional area and the flow path length of the through-hole. However, in the vibration damping device having the conventional structure, it is extremely difficult to sufficiently secure the flow path length of the through hole, so that the degree of freedom in tuning the vibration damping characteristics based on the fluid flow through the through hole is small. It has been extremely difficult to obtain an effective anti-vibration effect for input vibrations in the low to medium frequency range of about 10 to 50 Hz.

[0006]

The present invention has been made in view of the above-mentioned circumstances, and an object of the present invention is to provide a partition member which can be easily and easily provided with a simple structure and excellent workability. An object of the present invention is to provide a fluid filled type vibration damping device that can be firmly assembled.

Further, the present invention provides a fluid-filled protection device which can secure a large degree of freedom in tuning of vibration-proof characteristics exerted based on fluid flow accompanying deformation or displacement of a movable rubber film with a simple structure. Providing a vibration device is also one of the solutions.

[0008]

An embodiment of the present invention which has been made to solve such a problem will be described below. In addition, each aspect described below can be adopted in any combination. In addition, it should be understood that aspects and technical features of the present invention are not limited to those described below, but are recognized based on the inventive concept described in the entire specification and the drawings. It is.

According to a first aspect of the present invention, a first mounting member is provided at a position apart from one opening in the axial direction of a second mounting member having a substantially cylindrical shape. While the member and the second mounting member are connected by the main rubber elastic body, one axial side of the second mounting member is covered in a fluid-tight manner on one opening side, and the other axial side of the second mounting member is closed. By covering the opening side in a fluid-tight manner with an easily deformable flexible film, a fluid chamber in which an incompressible fluid is sealed is formed between the main rubber elastic body and the flexible film. A partition member is accommodated and arranged inside the chamber, and the fluid chamber is partitioned on both sides in the axial direction, so that a pressure receiving chamber in which a part of the wall is formed of the main rubber elastic body and a part of the wall in which the An equilibrium chamber made of a flexible film is formed on both sides of the partition member, and the pressure receiving chamber and the equilibrium chamber are mutually connected. In the fluid filled type vibration damping device provided with a first orifice passage communicating with the first orifice passage, the partition member is configured to include a first partition body and a second partition body which are mutually press-fitted and fixed in the axial direction. A receiving recess is formed at a central portion of one end face in the axial direction of the first partition, a movable rubber film is disposed in the receiving recess, and an annular plate member is provided on an outer peripheral edge of the movable rubber film. While being fixed, the annular plate member is fixedly held between the first partition and the axial end face of the second partition while being held between the movable rubber film and the first partition. Between the second partition members, each of the pressure receiving chamber and the equilibrium chamber is communicated with one of the chambers to form an allowable space for allowing the elastic deformation of the movable rubber film. Extending circumferentially on at least one surface of the first partition and the second partition Forming a concave groove, and covering the concave groove with the annular plate member, so that the at least one allowable space communicates with the pressure receiving chamber or the equilibrium chamber, based on the deformation of the movable rubber film. Forming a second orifice passage tuned to a higher frequency range than the first orifice passage, which allows fluid flow between the pressure receiving chamber and the equilibrium chamber;
In each of the first partition and the second partition, an annular protrusion is formed to project from the outer peripheral surface, and the two annular protrusions are overlapped with each other to open the other opening in the axial direction of the second mounting member. It has been fixed by caulking.

In the fluid filled type vibration damping device according to the first aspect, the first partition and the second partition are simply press-fitted and fixed to each other with the movable rubber film interposed therebetween. The partition member can be configured by integrating the one partition body and the second partition body. Further, by holding the annular plate member fixed to the outer peripheral edge of the movable rubber film between the first partition member and the second partition member, the movable rubber film can be stably held with a simple structure. Can be done. Furthermore, by using such an annular plate member, the first partition body and / or the concave groove formed in the second partition body allows
A fluid flow path capable of exhibiting an anti-vibration effect based on a fluid flow accompanying the deformation of the movable rubber film is formed as the second orifice passage, and a large flow path length can be easily set.

Therefore, according to the fluid-filled type vibration damping device of this embodiment, the partition member can be easily assembled with a simple structure, whereby, for example, the partition member is assembled in the atmosphere and assembled. Things,
It becomes possible to assemble the second mounting member in an incompressible fluid, and the productivity of the vibration isolator can be improved. Further, after the assembly, the first partition and the second partition are subjected to not only the mutual press-fitting fixing force but also the caulking fixing force by the second mounting member. And the assembled state of the second partition body can be maintained at a high strength. Furthermore, by adopting the annular plate member, the movable rubber film can be easily and stably assembled, and the second orifice passage having a large flow path length requires a special member. It can be formed with a simple structure without any problems, and a large degree of freedom in tuning of the vibration damping effect exerted based on the fluid flow accompanying the deformation of the movable rubber film is secured. Thereby, based on a flow action such as a resonance action of the fluid caused to flow through the second orifice passage, for example, a low to
It is also possible to effectively and easily obtain an anti-vibration effect against vibration in the middle frequency range.

In this embodiment, an allowable space formed between the rubber film and the first or second partition and located on the pressure receiving chamber side, and an allowable space between the rubber film and the second or first partition are provided. At least one of the permissible spaces formed therebetween and positioned on the equilibrium chamber side may be in communication with the pressure receiving chamber or the equilibrium chamber through the second orifice passage.
When both of the allowable spaces are communicated with the pressure receiving chamber or the equilibrium chamber through the second orifice passage, tuning is performed by considering both the second orifice passages as one orifice passage as a whole. Good.
Furthermore, when only one of the permissible spaces is communicated with the pressure receiving chamber or the equilibrium chamber through the second orifice passage, for example, the first or second partition body constituting the wall of the other permissible space may be provided. On the other hand, a configuration in which one or a plurality of open windows extending linearly from the other allowable space to the balance chamber or the pressure receiving chamber can be suitably adopted.

According to a second aspect of the present invention, in the fluid filled type vibration damping device according to the first aspect, the outer peripheral surface of one of the first partition and the second partition is provided. ,
A circumferential groove extending in the circumferential direction is formed, and the first orifice passage is formed using the circumferential groove. In this aspect, the first orifice passage can be easily formed with a simple structure with a sufficiently large flow passage length, and the degree of freedom in tuning the first orifice passage can be advantageously secured. You can do it. In addition, such a circumferential groove is, for example, press-fitting the other partition body into the outer peripheral surface of one of the first partition body and the second partition body in which the circumferential groove is formed, and Covering, or covering the outer peripheral surface of any one of the first partition and the second partition formed with the circumferential groove by fixing the second mounting member to the outside. Thereby, a first orifice passage can be formed.

According to a third aspect of the present invention, in the fluid filled type vibration damping device according to the first or second aspect, an annular fixing member is fixed to an outer peripheral edge of the flexible film. The fixing member is superimposed on each of the annular projections of the first partition and the second partition, and is caulked and fixed together with those annular projections to the other axial opening of the second mounting member. By doing so, the other opening in the axial direction of the second mounting member is covered with the flexible film in a fluid-tight manner. In such an embodiment, the assembly of the flexible membrane and the formation of the fluid chamber thereby can be performed simultaneously with the assembly of the partition member with a simple structure and excellent workability.

According to a fourth aspect of the present invention, in the fluid filled type vibration damping device according to the first to third aspects, one of the first partition and the second partition is provided. ,
It is characterized by comprising a block-shaped structure made of a hard material, forming the accommodating recess and the groove in the block-shaped structure, and forming the other of them by a press-formed product made of metal. And In this aspect, by forming both the accommodating recess and the concave groove for one of the partition members formed of the block-like structure, a press-formed product is adopted as the other partition member. This makes it easier to manufacture the partition member, and thus the vibration isolator, and also makes it possible to increase the manufacturing cost.

According to a fifth aspect of the present invention, there is provided a fluid filled type vibration damping device according to the first to fourth aspects, wherein
Forming a seal rubber layer covering the annular plate member, via the seal rubber layer, the annular plate member is sandwiched between the first partition body and the second partition body and fixedly held, Features. In such an embodiment, a short circuit or the like in the second orifice passage can be advantageously prevented, the intended vibration damping effect can be stably obtained, and the reliability of the vibration damping device as a product is also advantageous. Can be improved.

[0017]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, in order to clarify the present invention more specifically, embodiments of the present invention will be described in detail with reference to the drawings.

FIG. 1 shows an engine mount 10 for an automobile according to an embodiment of the present invention. The engine mount 10 has a first mounting member 12 as a first mounting member and a second mounting member 1 as a second mounting member elastically connected by a main rubber elastic body 16.
4, the first mounting bracket 12 is mounted on the power unit of the vehicle, and the second mounting bracket 14 is mounted on the body of the vehicle, so that the power unit is supported on the body by vibration isolation. ing. In such a mounted state, the main rubber elastic body 16 is elastically deformed by the weight of the power unit, and the first mounting bracket 12 and the second mounting bracket 1 are deformed.
4 are brought closer to each other. In this mounting state, the main vibration to be damped is input in the approaching / separating direction of the first mounting bracket 12 and the second mounting bracket 14 (substantially up and down direction in FIG. 1 which is the center axis of the mount). The Rukoto.
In the following description, the vertical direction refers to the vertical direction in FIG. 1 in principle.

More specifically, the first mounting member 12 has a substantially disk shape, and extends outward in the radial direction at a part on the outer periphery thereof, and has a protruding tip portion that extends downward. Bends,
Further, a substantially hook-shaped stopper portion 18 whose lower end portion is bent inwardly in an L-shape is integrally formed. At the center of the lower surface of the first mounting member 12, a cup-shaped metal member 20 having a tapered peripheral wall is overlapped at its opening and fixed by welding or the like. Further, a mounting bolt 22 protruding upward is fixed at the center of the first mounting bracket 12, and the first mounting bracket 12 is fixed by the mounting bolt 22.
Are fixedly attached to a power unit (not shown).

On the other hand, the second mounting member 14 has a large-diameter cylindrical shape, and the upper opening in the axial direction is a tapered portion 24 that expands toward the opening. Further, a part of the taper portion 24 in the circumferential direction slightly extends in the radial direction, and a stopper contact portion 30 is integrally formed. Further, at the lower end in the axial direction, there is provided an annular plate-shaped stepped portion 26 which spreads radially outward, and projects axially outward from the outer peripheral edge of the stepped portion 26. Thus, a cylindrical caulked portion 28 is integrally formed.

The first mounting brackets 12 are arranged so as to extend in the direction perpendicular to the axis, substantially on the central axis of the second mounting brackets 14 and separated from each other in the axial direction. A main rubber elastic body 16 is interposed between the opposing surfaces of the first mounting member 12 and the second mounting member 14 while being opposed to each other. This rubber elastic body 16 is
It has a large diameter substantially hollow frustoconical shape, and the first mounting member 12 is superimposed on the small diameter side end surface to form a cup-shaped metal member 20.
Are vulcanized and bonded in an axially inserted state. On the other hand, on the outer peripheral surface of the large-diameter end of the main rubber elastic body 16,
The inner peripheral surfaces of the tapered portion 24 of the second mounting member 14 are overlapped and vulcanized and bonded. In short, the main rubber elastic body 16 is formed as an integrally vulcanized molded product including the first mounting member 12 and the second mounting member 14, and the opening of the second mounting member 14 on the upper side in the axial direction is formed. , Rubber elastic body 16
It is covered in a fluid-tight manner. A thin seal rubber layer 36 covering substantially the entire surface of the second mounting member 14 is formed integrally with the main rubber elastic body 16. A large-diameter circular recess 32 that opens into the second mounting bracket 14 is formed on the large-diameter end surface of the main rubber elastic body 16.

Further, a cushioning rubber 34 which covers the inner and outer surfaces and protrudes upward and downward in the axial direction is formed integrally with the rubber elastic body 16 at the stopper contact portion 30 of the second mounting member 14. A stopper portion 18 formed on the first mounting member 12 is disposed facing the stopper contact portion 30 vertically and outwardly. Then, the stopper portion 18 abuts on the stopper abutment portion 30 via the buffer rubber 34 so that an excessive relative displacement amount between the first mounting member 12 and the second mounting member 14 is limited. It has become.

On the other hand, a diaphragm 40 made of a rubber thin film as a flexible film is provided in an opening below the second mounting member 14 in the axial direction. This diaphragm 40
Has a thin disk shape with a slack so as to be easily deformed, and a ring fitting 38 as a fixing member having a substantially ring shape is vulcanized and bonded to the outer peripheral edge. The ring fitting 38 is superimposed on the step 26 of the second fitting 14 and fixed by caulking with the caulking part 28, so that the opening below the second fitting 14 in the axial direction is formed by the diaphragm 40. A fluid chamber 42 in which an incompressible fluid is sealed is provided between the main rubber elastic body 16 which covers both sides in the axial direction of the second mounting member 14 and the opposed surface of the diaphragm 40. Is formed. Note that water, alkylene glycol, polyalkylene glycol, silicone oil, or the like is used as the sealed fluid. In particular, in order to advantageously obtain a vibration damping effect based on the resonance action of the fluid described later, 0 is used in the present embodiment. .1P
A low-viscosity fluid of a · s or less is suitably employed. In addition, a seal rubber 48 is provided on the upper surface of the ring fitting 38 to give the fluid chamber 42 a high degree of fluid tightness.

In this embodiment, the second mounting bracket 1
4, a bottom fitting 44 is provided at the lower opening, and covers the outside of the diaphragm 40 so that the second fitting 1
4 is assembled. The bottom fitting 44 has a substantially shallow bottomed cylindrical shape, and has a mounting bolt 46 fixed in the center of the bottom wall and protruding downward in the axial direction. An outwardly extending flange 47 is integrally formed. Then, the flange-shaped portion 47 is superimposed on the lower surface of the ring fitting 38 fixed to the outer peripheral edge of the diaphragm 40, and is fixed together with the ring fitting 38 by the swaging portion 28 of the second mounting fitting 14. Is fixedly assembled. The mounting bolt 46 fixed to the bottom bracket 44 is fixed to a body (not shown), so that the second mounting bracket 1 is mounted.
4 is fixedly attached to the body via a bottom fitting 44. Note that an air chamber 54 is formed between the diaphragm 40 and the bottom fitting 44 to allow the diaphragm 40 to be deformed.

Further, inside the second mounting bracket 14,
A partition member 48 is accommodated and arranged in the fluid chamber 42. The partition member 48 has a substantially thick disk shape as a whole, and is fixed to the second mounting member 14 in a state where the partition member 48 is spread in the fluid chamber 42 in the direction perpendicular to the axis. Thereby, the fluid chamber 42 is partitioned on both upper and lower sides with the partition member 48 interposed therebetween. On the upper side of the partition member 48, a part of the wall portion is
The pressure receiving chamber 50 constituted by 6 is formed, while the equilibrium chamber 52 in which a part of the wall is constituted by the diaphragm 40 is formed below the partition member 48. That is, the pressure receiving chamber 50 is configured such that vibration is input along with the elastic deformation of the main rubber elastic body 16 at the time of vibration input, thereby causing an internal pressure fluctuation, while the equilibrium chamber 52 is configured based on the deformation of the diaphragm 40. Thus, a change in volume is easily allowed, and a change in internal pressure is absorbed.

Here, the partition member 48 has a partition member main body 56 as a first partition body and a press fitting 58 as a second partition body pressed and fixed to each other.
The movable rubber film 60 is formed between the first and second partition bodies as one assembly. As shown in FIGS. 2 and 3, the partition member main body 56
It has a substantially circular block structure made of a hard material such as a synthetic resin, particularly preferably a metal such as an aluminum alloy, and has a circular receiving recess which opens downward in a central portion of an axial lower end surface. 62 are formed. In other words, the partition member body 56 includes the thick bottom wall 64 and the cylindrical wall 6.
6 has an inverted cup shape. In addition, the cylindrical wall 6
A flange 68 as an annular protrusion that extends radially outward is formed integrally with the outer peripheral edge of the opening 6. Further, the cylindrical wall portion 66 is opened to the outer peripheral surface, extends in the circumferential direction with a length of less than one round, and is further folded back to extend in the circumferential direction with a length of slightly less than one round. One end of the circumferential groove 70 is formed in the upper end surface of the cylindrical wall 66 by a notch 72, and the other end is formed as a communication hole. 74 opens the inner peripheral surface of the cylindrical wall portion 66. On the lower surface of the bottom wall portion 64, there is formed a circular central concave portion 76 that opens to the central portion, and a concave groove 78 that extends around the central concave portion 76 in the circumferential direction with a length of one turn or less. Groove 7
One end of 8 is opened to the upper surface of the bottom wall 64 by a communication hole 80, while the other end is connected to a central recess 76 by a notch 82.

The movable rubber film 60 is provided on the partition member main body 5.
6 has a disk shape of a predetermined thickness having substantially the same outer diameter as the central concave portion 76 formed at the outer peripheral edge thereof.
A plate fitting 84 as an annular plate member is vulcanized and bonded. The plate fitting 84 is made of a hard material such as a metal, and has an outer diameter slightly smaller than the inner diameter of the accommodation recess 62 formed in the partition member main body 56. It has a shape. The surface of the plate fitting 84 is covered almost entirely with a thin sealing rubber layer 86 integrally formed with the movable rubber film 60. Then, the movable rubber film 60 to which the plate fitting 84 is vulcanized is fitted into the housing recess 62 of the partition member main body 56, and spreads in the direction perpendicular to the axis. It is arranged to be superimposed on the bottom. In this arrangement, the seal rubber layer 86 covering the outer peripheral surface of the plate fitting 84 is dimensioned so as to be substantially superimposed on the inner peripheral surface of the accommodation recess 62.

Further, the press fitting 58 has an inverted bottomed cylindrical shape that opens downward and is formed by, for example, drawing a metal disc obtained by punching or the like by pressing. A flange 88 is formed integrally with the opening peripheral edge as an annular protrusion that extends radially outward. In the center of the bottom wall of the press fitting 58,
A circular concave portion 90 that is recessed downward is formed, and the radial dimension of the circular concave portion 90 is made substantially the same as the radial dimension of the central concave portion 76 formed in the partition member main body 56, and the mutual opening portions are formed. They are located opposite each other in the axial direction. Further, a plurality of opening windows 92 penetrating in the axial direction are formed in the bottom wall portion of the circular concave portion 90 with a sufficiently large opening area. In the present embodiment, in particular, in the present embodiment, the windows 92 are arranged at substantially equal intervals in the circumferential direction. The four circular opening windows 92 are formed.

The press fitting 58 is press-fitted into the accommodating recess 62 of the partition member main body 56 from below in the axial direction, and a cylindrical wall portion 94 of the press fitting 58 is formed.
Is press-fitted and fixed to the inner peripheral surface of the cylindrical wall portion 66 of the partition member main body 56. Further, thereby, the outer peripheral portion (the portion located around the circular concave portion 90) 96 of the bottom wall portion of the press fitting 58 is moved to the housing concave portion 62 of the partition member main body 56.
The plate fitting 84 is pressed against the lower surface of the plate fitting 84 fitted into the bottom wall 64 of the partition member main body 56 and the bottom wall outer peripheral portion 9 of the press fitting 58.
6 and is fixedly held in the axial direction. Moreover, the bottom wall 64 of the partition member main body 56 and the outer peripheral portion 96 of the bottom of the press fitting 58 with respect to the plate fitting 84 are formed by the seal rubber layer 86 covering the plate fitting 84.
Are sealed in a fluid-tight manner. Further, the flange 88 of the press fitting 58 is closely overlapped with the lower surface of the flange 68 formed on the partition member main body 56. The outer diameters of the flange 88 and the flange 68 are substantially equal to each other.

The partition member 48 thus formed by assembling the partition member body 56, the press fitting 58, and the movable rubber film 60 with each other and assembling them together with the shaft of the second mounting fitting 14. The outer peripheral surface of the partition member body 56 is fitted into the seal rubber layer 36 with respect to the inner peripheral surface of the second mounting member 14.
It is assembled in a state where it is closely sandwiched. Furthermore,
The flange 68 of the partition member main body 56 and the flange 88 of the press fitting 58 that are overlapped with each other are connected to the second mounting fitting 14.
The ring fitting 38 and the bottom fitting 44 are superimposed on the lower surface of the step portion 26 in FIG.
Together with the flange-shaped portion 47 of the second mounting member 14.

When the partition member 48 is assembled, the opening of the peripheral groove 70 of the partition member main body 56 is covered with the second mounting member 14 in a fluid-tight manner, so that the outer peripheral portion of the partition member 48 is covered. The equilibrium chamber 52 extends in the circumferential direction by at least one circumference, opens to the pressure receiving chamber 50 through the notch 72, and penetrates the cylindrical wall portion 94 of the press fitting 58.
Thus, a first orifice passage 98 that connects the pressure receiving chamber 50 and the equilibrium chamber 52 to each other is formed. In particular, in the present embodiment, based on the relative pressure fluctuation generated between the pressure receiving chamber 50 and the equilibrium chamber 52 at the time of the vibration input, the shake action of the fluid caused to flow through the first orifice passage 98 is performed. 10Hz like
A ratio of A1 / L1 between the cross-sectional area of the first orifice passage 98: A1 and the length of the passage: L1 is appropriate so that an effective vibration damping effect can be exerted against low-frequency, large-amplitude vibration. Is set to

The central portion of the partition member 48 is overlapped with the opening of the housing recess 62 of the partition member main body 56 and the central recess 76 of the press fitting 58 with the movable rubber film 60 interposed therebetween. A disk-shaped upper space 100 and a lower space 102 as allowable spaces are formed on the upper and lower sides of the movable rubber film 60, respectively. The upper and lower spaces 100 and 102 allow free elastic deformation of the movable rubber film 60, and
When the movable rubber film 60 abuts on the partition member main body 56 and the press fitting 58 that define the upper and lower spaces 100 and 102, the amount of elastic deformation of the movable rubber film 60 is limited. In short, the movable rubber film 60
Are arranged so as to be elastically deformable with the amount of elastic deformation limited by the upper and lower spaces 100 and 102.
The zero and the lower space 102 are separated from each other in a fluid-tight manner.

Further, a concave groove 78 is fluid-tightly covered with a plate fitting 84 at a radially intermediate portion of the partition member main body 56, so that it extends in the circumferential direction with a length of less than one round to form the upper space 100. A second orifice passage 104 communicating with the pressure receiving chamber 50 is formed. Further, a lower space 102 formed below the movable rubber film 60 communicates with the balance chamber 52 through an opening window 92. The volume change of the lower space 102 is allowed by the fluid flow through these opening windows 92, so that the elastic deformation of the movable rubber film 60 is allowed. Movable rubber film 6 through 104
The movable rubber film 60 is elastically deformed based on the difference between the pressure of the pressure receiving chamber 50 applied to the upper surface of the movable rubber film 60 and the pressure of the equilibrium chamber 52 applied to the lower surface of the movable rubber film 60. With the elastic deformation, fluid flow through the second orifice passage 104 is allowed. In particular, in the present embodiment, the movable rubber film 60 is caused to flow through the second orifice passage 98 with the elastic deformation of the movable rubber film 60 based on the relative pressure fluctuation generated between the pressure receiving chamber 50 and the balance chamber 52 at the time of vibration input. 20Hz such as idling vibration due to the resonance action of the fluid
The second orifice passage 10 is provided so as to exhibit an effective vibration damping effect against low to medium frequency medium amplitude vibration of about
No. 4 passage area: ratio of A2 to passage length: L2: A2 / L
The value of 2 is set appropriately. Note that the corners are formed by the rubber film
In general, the value of A1 / L1 in the first orifice passage 98 is given by A2 / L2> A
It is set to be 1 / L1.

Accordingly, in the engine mount 10 having the above-described structure, the partition member 48 having the movable rubber film 60 incorporated therein and forming the first and second orifice passages 98 and 104 is previously assembled in the atmosphere. For example, by assembling the assembled partitioning member 48 in a fluid to the second mounting member 14 to which the main rubber elastic body 16 is vulcanized and bonded, the purpose can be improved. The engine mount 10 can be easily manufactured.

Also, the assembling of the partition member 48, which is an assembly body, is excellent because only the press-fitting and fixing of the partition member main body 56 and the press fitting 58 need be performed without the need for bolts, rivets, welding or the like. Can be realized. In addition, the partition member body 56 and the press fitting 58
In addition to being simply press-fitted and fixed, the product is caulked and fixed to each other by the second mounting bracket 14, so that a strong assembling force can be obtained stably and easily. , Excellent durability and reliability can be realized.

Further, a plate metal member 84 is fixed to the outer peripheral edge of the movable rubber film 60, and when the movable rubber film 60 is assembled between the partition member main body 56 and the press metal member 58, the plate metal member 84 is attached to the partition member main body. By clamping between the press fitting 56 and the press fitting 58, the movable rubber film 60 could be easily and firmly assembled to the partition member 48 by utilizing the plate fitting 84 well. The second orifice passage 104 can also be advantageously formed with a large flow path length without requiring any special members. And by that
It is possible to more stably obtain the anti-vibration characteristics of the movable rubber film 60, and it is possible to advantageously secure the freedom of tuning the anti-vibration characteristics of the mount.

Further, the engine mount 1 of the present embodiment
0, the restricting member for reliably restricting the amount of elastic deformation of the movable rubber film 60 includes the partition member main body 56 and the fres
It can be formed well with a small number of parts and a simple structure.

Although the engine mount 10 according to the first embodiment of the present invention has been described in detail above, this is merely an example, and the present invention is not limited to any specific description in this embodiment. It is not interpreted.

For example, in the above-described embodiment, the partition member 48 is formed by press-fitting and fixing a press fitting 58 as a press-formed product on the inner peripheral side of the partition member body 56 as a block-shaped structure. For example, as shown in FIG. 6, on the other hand, a partition member 110 formed by press-fitting and fixing a press fitting 108 as a press-formed product on the outer peripheral side of the partition member body 106 as a block-shaped structure. It is also possible to employ. In FIG. 6, members and parts having the same structure as in the first embodiment are denoted by the same reference numerals as those in the first embodiment in order to facilitate understanding. deep.

That is, the partition member 110 shown in FIG.
, The partition member body 1 as a block-shaped structure
A housing recess 62 is formed on an axially upper end surface of the housing 06, and a central recess 76 and a recess groove 78 are formed on the bottom surface of the housing recess 62. In addition, the accommodation recess 62
The movable rubber film 60 is fitted into the partition member main body 106, and a press fitting 108 having a large-diameter substantially inverted cylindrical shape is assembled from the upper side in the axial direction of the partition member main body 106.
The partition member 106 is press-fitted and fixed to the outer peripheral surface. Then, the partition member main body 1 is formed by the press fitting 108.
First orifice passage 98 with peripheral groove 70 covered
Are formed, and a plate fitting 84 bonded and vulcanized to the outer peripheral edge of the movable rubber film 60 is attached to the partition member main body 56.
And the central recess 76 and the concave groove 78 are covered with the plate fitting 84 to form the second orifice passage 104. In the center of the upper bottom portion of the press fitting 108, an inverted circular concave portion 112 which is concave upward is formed.
An upper space 100 and a lower space 102 are formed between the movable rubber film 12 and the movable rubber film 60 and between the central concave portion 76 and the movable rubber film 60 in the partition member main body 56, and the elastic deformation of the movable rubber film 60 is allowed. It has become.

In the partition member 110 having such a structure, the partition member main body 106 and the press fitting 108 can be press-fitted and fixed in the atmosphere to form an assembly. Is
Like the engine mount 10 according to the first embodiment,
The first orifice passage 98 and the second orifice passage 10
4. Since the movable rubber film 60 is formed, the same effects as those of the engine mount 10 according to the first embodiment are all effectively exhibited.

The length, cross-sectional area and the like of the first orifice passage 98 and the second orifice passage 104 are appropriately set according to the required vibration-proof characteristics and the like. Not interpreted.

Further, the present invention can be advantageously applied to a body mount, a differential mount, or a fluid filled type vibration damping device in various devices other than a vehicle, in addition to a vehicle engine mount.

In addition, although not enumerated one by one, the present invention
Based on the knowledge of those skilled in the art, the present invention can be implemented in a form in which various changes, modifications, improvements, and the like are made.
It goes without saying that all such embodiments are included in the scope of the present invention without departing from the spirit of the present invention.

[0045]

As is apparent from the above description, in the fluid filled type vibration damping device having the structure according to the present invention, the first orifice passage and the second orifice passage which are tuned differently from each other are formed by: Each of them can be easily formed with a simple structure with a large degree of tuning freedom by adjusting the passage length and the passage sectional area.

[Brief description of the drawings]

FIG. 1 is an explanatory longitudinal sectional view showing an automobile engine mount as a first embodiment of the present invention.

FIG. 2 is a side view showing a partition member main body used in the engine mount shown in FIG. 1, and FIG.
It is a figure corresponding to II-II cross section.

FIG. 3 is a longitudinal sectional view of the partition member main body shown in FIG. 2, and is a view corresponding to a III-III section in FIG.

FIG. 4 is a bottom view of the partition member main body shown in FIG.

FIG. 5 is a bottom view showing a press fitting used for the engine mount shown in FIG. 1;

FIG. 6 is a longitudinal sectional view showing an automobile engine mount as a second embodiment of the present invention.

[Explanation of symbols]

 REFERENCE SIGNS LIST 10 engine mount 12 first mounting bracket 14 second mounting bracket 16 main body rubber elastic body 40 diaphragm 42 fluid chamber 48 partition member 50 pressure receiving chamber 52 equilibrium chamber 56 partition member main body 58 press fitting 60 movable rubber film 62 housing recess 68 Collar 76 Central recess 78 Groove 84 Plate fitting 88 Flange 90 Circular recess 98 First orifice passage 100 Upper space 102 Lower space 104 Second orifice passage

Claims (5)

[Claims] A first mounting member is provided at a distance from one axial side of an opening of a second mounting member having a substantially cylindrical shape, and the first mounting member and the second mounting member are arranged. Are connected by a rubber elastic body so as to cover one opening side in the axial direction of the second mounting member in a fluid-tight manner, while easily deforming the other opening side in the axial direction of the second mounting member. By forming a fluid-tight cover with a flexible membrane, a fluid chamber in which an incompressible fluid is sealed is formed between the main rubber elastic body and the flexible membrane, and a partition member is provided inside the fluid chamber. By storing and arranging the fluid chamber on both sides in the axial direction, a pressure receiving chamber in which a part of a wall is formed of the main rubber elastic body, and a part of the wall is formed of the flexible film. Equilibrium chambers are formed on both sides of the partition member, and a first orifice for interconnecting the pressure receiving chamber and the equilibrium chamber is provided. In the fluid filled type vibration damping device provided with the fiss passage, the partition member is configured to include a first partition member and a second partition member which are mutually press-fitted and fixed in the axial direction, and the first partition member is provided with the first partition member. Forming a receiving recess in the central part of one end face in the axial direction of the body,
A movable rubber film is disposed in the housing recess, and an annular plate member is fixed to an outer peripheral edge of the movable rubber film, and the annular plate member is axially moved between the first partition and the second partition. While being fixedly held between the end faces, between the movable rubber film and the first partition and between the second partition,
A first partition and a second partition which respectively communicate with one of the pressure receiving chamber and the equilibrium chamber to allow an elastic deformation of the movable rubber film and sandwich the annular plate member. By forming a circumferentially extending concave groove on at least one surface of the at least one surface and covering the concave groove with the annular plate member, the at least one allowable space communicates with the pressure receiving chamber or the equilibrium chamber, Forming a second orifice passage tuned to a higher frequency range than the first orifice passage, allowing fluid flow between the pressure receiving chamber and the equilibrium chamber based on the deformation of the movable rubber film, and In each of the first partition body and the second partition body, an annular protrusion that protrudes on the outer peripheral surface is formed,
A fluid filled type vibration damping device, wherein the two annular projections are overlapped and caulked and fixed to the other axial opening of the second mounting member. 2. A circumferential groove extending in a circumferential direction is formed on an outer peripheral surface of one of the first partition and the second partition, and the first orifice passage is formed by using the circumferential groove. The fluid filled type vibration damping device according to claim 1, wherein 3. An annular fixing member is fixed to an outer peripheral edge of the flexible film, and the fixing member is superimposed on each of the annular projections of the first partition and the second partition, and By caulking and fixing to the other axial direction opening of the second mounting member together with the annular projections, the other axial direction opening of the second mounting member is made fluid-tight with the flexible film. The fluid filled type vibration damping device according to claim 1, wherein the device is covered. 4. One of the first partition and the second partition is formed of a block-shaped structure made of a hard material, and the storage recess and the recess are formed with respect to the block-shaped structure. 4. The fluid filled type vibration damping device according to claim 1, wherein a groove is formed and the other of the grooves is formed by a press-formed product made of metal. 5. A seal rubber layer covering the annular plate member is formed, and the annular plate member is fixedly held between the first partition member and the second partition member via the seal rubber layer. The fluid filled type vibration damping device according to any one of claims 1 to 4, wherein