JP2814881B2 - Partition member for fluid-filled mount - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a partition member for a fluid-filled mount mounted on a fluid-filled mount to partition a fluid chamber into two divided fluid chambers and to form an orifice passage connecting the divided fluid chambers to each other. It is about.

[0002]

2. Description of the Related Art Conventionally, as a kind of a vibration-proof connecting member or a support member interposed between members constituting a vibration transmitting system such as an engine mount and a body mount for an automobile, Japanese Patent Application Laid-Open No.
As disclosed in Japanese Patent Application Publication No. 9340/1993, a first support fitting and a second support fitting are connected by a rubber elastic body, and a fluid chamber in which a predetermined incompressible fluid is sealed is formed. At least, there is known a fluid-filled mount that utilizes an anti-vibration effect based on a fluid flow action.

In such a fluid-filled mount, a partition member is generally provided in the fluid chamber,
The fluid chamber is partitioned into two divided fluid chambers located on both sides of the partition member. Further, the partition member is formed with an orifice passage communicating the two divided fluid chambers with each other, and a movable film capable of small displacement based on an internal pressure difference between the two divided fluid chambers, and is made to flow through the orifice passage. While the damping effect at the time of low-frequency vibration input is exhibited based on the resonance action of the fluid being applied, the rise of the dynamic spring at the time of high-frequency vibration input is reduced based on the hydraulic pressure absorption action due to the displacement of the movable membrane. I have.

In such a fluid-filled mount, it is effective to lengthen the orifice passage and increase the resonance mass of the fluid in order to improve the damping effect against low-frequency vibration. Therefore, as disclosed in the above-mentioned publication, in the partition member, an orifice passage is generally formed by a flow path extending in a circumferential direction on an outer peripheral portion.

However, in the orifice passage having such a structure, at most, a length less than one circumference in the circumferential direction of the partition member can be ensured. Therefore, when a larger damping effect is required, the required characteristics are achieved. It was difficult.

In order to realize a longer orifice passage, for example, a partition plate is provided in a flow passage formed in the outer peripheral portion of the partition member, and the flow passage is formed in two stages in the axial direction or the circumferential direction. By partitioning and connecting each other in series,
It is also conceivable to secure a length of at least one circumference in the circumferential direction.
However, in order to form such an orifice passage, it is necessary to incorporate a partition plate inside the partition member, so that the number of parts of the partition member increases, and the structure becomes complicated and assembly becomes troublesome. However, they were not always effective means.

[0007]

Here, the present invention has been made in view of the above-mentioned circumstances, and an object of the present invention is to provide an orifice passage which extends over an outer peripheral portion with a length of one or more times in a circumferential direction. Without additional special components,
An object of the present invention is to provide a fluid-filled mounting partition member having a novel structure that can be formed with a simple structure.

[0008]

In order to solve such a problem, the present invention provides a fluid-filled mount partition member having an orifice passage and a movable membrane capable of small displacement, as described above, comprising a first partition The plate and the second partition plate are overlapped with each other, and the movable film is accommodated and arranged in a space formed between the overlapping surfaces of the two partition plates. A first flow path extending in a circumferential direction on an outer peripheral side of the outer peripheral edge by partitioning the space by an outer peripheral edge of the movable film while holding the partition between the partition plates; And a second flow path extending in the circumferential direction between the overlapping surfaces of the first and second partition plates, and allowing the first flow path and the second flow path to communicate with each other. Thereby, the fluid-filled mounting partition member formed with the orifice passage, It is an aspect of the.

[0009]

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.

First, FIG. 1 shows an engine mount 12 having a partition member 10 according to one embodiment of the present invention.

The engine mount 12 has a first support member 14 and a second support member 16 attached to one of the power unit side and the body side. They are connected by a body 18. The first support member 14 has a disk shape, a retainer 20 is fixed on the lower surface, and a mounting bolt 22 protruding upward at the center.
Is fixed

The second support member 16 includes a cylindrical member 24 having a substantially cylindrical shape and a bottom member 26 having a substantially cylindrical shape with a bottom. And, those tube fittings 24
The bottom fitting 26 is overlapped in the axial direction, and a caulking portion 28 provided at one axial opening of the tubular metal fitting 24 is caulked and fixed to a flange portion 30 provided at the opening of the bottom fitting 26. . Furthermore, a mounting bolt 31 protruding downward is fixed at the center of the bottom fitting 26.

The first support member 14 is opposed to the opening side of the second support member 16 at a predetermined distance, and a rubber elastic body 18 is interposed between them. . The rubber elastic body 18 has a substantially truncated conical shape, and the first supporting metal member 14 is vulcanized and bonded to the small-diameter side end surface, while the large-diameter side end portion of the rubber elastic member 18 forms the second supporting metal member 16. It is vulcanized and adhered to the tube fitting 24 that constitutes it. Thereby, the first support fitting 14 and the second support fitting 16 are elastically connected, and the opening of the second support fitting 16 is fluid-tightly closed by the rubber elastic body 18.

Further, inside the second support fitting 14,
A diaphragm 32 is accommodated and arranged, and a mounting bracket 34 is provided.
Is fixed to the second support member 16 by being clamped by a caulking portion of the cylindrical member 24 and the bottom member 26. The inside of the second support member 16 is fluid-tightly partitioned by the diaphragm 32, whereby the diaphragm 32 and the rubber elastic body 18 are separated.
A fluid chamber 36 in which a predetermined incompressible fluid is sealed is formed therebetween, and an air chamber 38 that allows deformation of the diaphragm 32 is formed on the opposite side of the fluid chamber 36.

As the fluid to be filled in the fluid chamber 36, for example, water, alkylene glycol, polyalkylene glycol, silicone oil or the like is used. The fluid chamber 3
The sealing of the fluid into 6 can be advantageously achieved by, for example, caulking and fixing the bottom fitting 26 to the integrally vulcanized molded product of the rubber elastic body 18 and assembling the diaphragm 32 in the fluid.

The partition member 10 is accommodated in the fluid chamber 36 formed as described above. The partition member 10 has a thick, generally disk shape as a whole, and its outer peripheral edge is superimposed on the diaphragm 32, and together with the diaphragm 32, the cylindrical metal fitting 24 and the bottom metal fitting 26 are formed.
By being clamped by the caulking portion, the second support fitting 1
6 is fixed. The partition member 10 divides the fluid chamber 36 into two parts. Thus, on one side of the partition member 10, a part of the wall is formed of the rubber elastic body 18, and the internal pressure fluctuates at the time of vibration input. Pressure receiving chamber 40
On the other side, an equilibrium chamber 42 is formed on the other side, in which a part of the wall is constituted by the diaphragm 32 and volume change is allowed. In this embodiment, the pressure receiving chamber 40 and the equilibrium chamber 42 constitute two divided fluid chambers.

More specifically, as shown in FIG. 2, an exploded perspective view, FIG. 3 is a plan view, and FIGS. The upper plate 44 and the lower plate 46 are formed by press molding or the like, respectively, as a partition plate and a second partition plate.

The upper metal plate 44 has a shape of a shallow bottom inverted cup which opens downward, and a flange 48 is formed at the periphery of the opening. Further, the upper metal plate 44 is provided with four through-holes 52 at a central portion of the bottom wall 50 and a communication hole 54 at an outer peripheral edge of the bottom wall 50.

On the other hand, the lower metal plate 46 has a substantially circular flat plate shape, and its radial center portion is curved downward to form an annular projection 56 projecting downward. A concave groove 58 that opens upward and extends continuously in the circumferential direction is formed in the annular protrusion 56. Further, an annular step portion 60 having a lower projecting height than the annular projecting portion 56 is formed on the inner peripheral side of the annular projecting portion 56. Further, the lower metal plate 46 is provided with four through holes 62 at a central portion, and a communication hole 64 is provided at a bottom wall portion of the annular projection 56.

The upper metal plate 44 and the lower metal plate 46 are overlapped in the axial direction, and the flange portion 48 of the upper metal plate 44 is brought into contact with the lower metal plate 46. It is mounted on the engine mount 12 by being clamped by the caulking portion of the tubular metal fitting 24 and the bottom fitting 26 (see FIG. 1).

A void is formed between the superposed surfaces of the upper metal plate 44 and the lower metal plate 46 which are superposed as described above, and a rubber film having a substantially disk shape as a movable film is formed therein. 66 are accommodated and arranged. This rubber film 66
Is composed of a central portion 68 that is thinner than the size in the cavity and an outer peripheral edge 70 that is thicker. The outer peripheral edge 70 is held between the upper metal plate 44 and the lower metal plate 46 with pressure. Thereby, it is arrange | positioned in the center position in a space. Note that the rubber film 66 is positioned by the edge of the step portion 60 and the annular protrusion 56 in the lower metal plate 46.

Thereby, as shown in FIG.
The space formed between the upper and lower metal fittings 44 and 46 is the rubber film 6.
6 are fluid-tightly partitioned into a radially inner portion and an outer portion, and three places in the concave groove 58 of the lower metal plate 46 by the outer peripheral portion 70. As shown in FIG. 2, a seal lip 71 extending in the circumferential direction is formed on the rubber film 66 on a contact surface with the upper and lower metal fittings 44 and 46.

In the space thus partitioned, a radially inner portion of the outer peripheral edge portion 70 of the rubber film 66 includes:
A central portion 68 of the rubber film 66 is disposed so as to be deformable by a predetermined amount, and is divided into upper and lower portions by the central portion 66. Further, the upper portion bisected by the central portion 68 is communicated with the pressure receiving chamber 40 through the through-hole 52 of the upper metal plate 44, while the lower portion bisected by the central portion 68 is formed of the lower metal plate 46. Equilibrium chamber 42 through through hole 62
Is communicated to. As a result, the internal pressure of the pressure receiving chamber 40 and the equilibrium chamber 42 is exerted on the upper and lower surfaces of the central portion 68 of the rubber film 66, and deformation based on the internal pressure difference between the two chambers 40 and 42 is allowed. In addition, fluctuations in the internal pressure of the pressure receiving chamber 40 during vibration input are absorbed.

An annular first flow path 72 extending in the circumferential direction is formed in a radially outer portion of the outer peripheral edge 70 of the space partitioned by the outer peripheral edge 70 of the rubber film 66. ing. Further, of the voids partitioned by the outer peripheral edge 70 of the rubber film 66, an annular second flow path 74 extending in the circumferential direction is formed in the concave groove 58 of the lower metal plate 46. .

Further, the outer peripheral edge 70 of the rubber film 66
At one point on the circumference, the first and second flow paths 72,
A cut-off portion 76 is formed to fill the two flow paths 72 and 74 so as to fill the flow passages 74 (see FIG. 5).
Accordingly, each of the first flow path 72 and the second flow path 74 has a length of less than one round in the circumferential direction. A notch 78 is provided on the outer peripheral edge 70 of the rubber film 66 on one side in the circumferential direction of the blocking portion 76 (see FIG. 4). The flow path 72 and the second flow path 74 are connected to each other at one end in the circumferential direction.
They are connected and connected in series.

The first flow path 72 is connected to the second flow path 74
At the end in the circumferential direction opposite to the connection portion with the first passage 72, the second passage 74 is connected to the first passage 72 through the communication hole 54 of the upper metal plate 44. Is connected to the equilibrium chamber 42 through a communication hole 64 of the lower metal plate 46 at a circumferential end opposite to the connecting portion. As a result, the orifice passage 80 that allows the pressure receiving chamber 40 and the equilibrium chamber 42 to communicate with each other and allows fluid to flow between the two chambers 40 and 42 has a length of less than two turns in the circumferential direction of the partition member 10. It is formed.

Therefore, in the partition member 10 structured as described above, the inner space is formed by the outer peripheral edge 70 of the rubber film 66.
Since the orifice passage 80 having a length of at least one circumference in the circumferential direction is formed by partitioning the orifice, the orifice passage has a very simple structure without a special member such as a partition plate. Can be advantageously ensured, whereby a further improvement of the damping effect on low-frequency vibrations can be advantageously achieved.

Moreover, in such a partition member 10,
By adjusting the relative position in the circumferential direction of the communication hole 54 of the upper metal plate 44 and the communication hole 64 of the lower metal plate 46,
The length of the orifice passage 80 is increased by about 1 to 2 in the circumferential direction of the partition member 10 without any change in the member size and shape.
Since it can be changed arbitrarily in the range of the circumference, tuning is also extremely easy.

FIGS. 6 to 9 show a partition member 82 as another embodiment of the present invention. In the present embodiment, since it is mounted on the same engine mount or the like as the first embodiment, only the single partition member 82 is illustrated, and the same structure as that of the first embodiment is adopted. The same reference numerals as in the first embodiment denote the same members and parts in the drawings, and a detailed description thereof will be omitted.

That is, in the partition member 82 of the present embodiment, the protruding height of the annular protruding portion 56 of the lower metal plate 46 is increased and the concave groove 58 is formed at the deep bottom, so that the second flow path is formed. 74 is formed with a flow cross-sectional area approximately twice that of the first flow path 72.

Further, only the second flow path 74 is blocked by the blocking portion 76 of the rubber film 66, and the first flow path 72 is formed continuously over the entire circumference. Further, the communication hole 54 that communicates the first flow path 72 with the pressure receiving chamber 38 is positioned radially opposite to a connection portion between the first flow path 72 and the second flow path 74 by the cutout 78. Have been. Thereby, two fluid flow paths extending in parallel with a length of approximately half a circumference on both sides in the circumferential direction are formed between the communication hole 54 and the notch 78 in the first flow path 72. Together, they form an orifice passage 80 together with the second flow passage 74. That is, the orifice passage 8
Since 0 is formed in parallel in the first flow path 72, the cross-sectional area of the orifice passage 80 is set to approximately twice the actual cross-sectional area of the first flow path 72. is there.

Therefore, in the partition member 82 of this embodiment, the flow path cross-sectional area of the first flow path 72 and thus the orifice passage 80 can be advantageously secured without increasing the outer diameter of the partition member. Accordingly, in addition to the same effects as those of the first embodiment, it is possible to effectively increase the resonance mass of the fluid while suppressing an increase in the radial dimension of the partition member 82 and thus the mount. There is an advantage that can be achieved.

In this embodiment, four projections 84 are formed on both sides of the central portion 68 of the rubber film 66, and the tip surfaces of the projections 84 are connected to the upper and lower metal fittings 44, 4 respectively.
6 is abutted. Thereby, the central part 68
In addition to reducing the hitting sound and the like due to the contact with the upper and lower plate fittings 44 and 46, the amount of deformation of the central portion 68 is regulated and the amount of hydraulic pressure absorption is limited.

Although the embodiments of the present invention have been described in detail above, these are literal examples, and the present invention should not be interpreted as being limited to such specific examples.

For example, in the partition member 10 of the first embodiment, the first flow path 72 is connected to the equilibrium chamber 42 and the second flow path 7
4 can be mounted on the engine mount 12 in a state where they are communicated with the pressure receiving chamber 40, respectively.

In the partition member 82 of the second embodiment, the first flow path 72 and the second flow path 74 may be formed with structures opposite to each other. That is, the first flow path 72 is formed with a cross-sectional area approximately twice as large as the second flow path 74, and the second flow path 74 constitutes two fluid flow paths extending in parallel in the circumferential direction. It is also possible to form a single fluid flow path extending in the circumferential direction by the first flow path 72, and to connect them to each other to form an orifice passage. With such a structure, there is an advantage that the resonance mass of the fluid can be increased while suppressing an increase in the axial dimension of the partition member 82 and thus the engine mount.

Further, the specific shapes of the upper metal plate 44 and the lower metal plate 46 are not limited to those of the above-described embodiment. For example, a lower metal plate 88 having a shape as shown in FIG. Is adopted, it is possible to adopt a simple circular plate-shaped metal fitting as the upper metal plate 86. In FIG. 10, members and portions 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.

Alternatively, as shown in FIGS. 11 to 14, the lower sheet metal fitting 46 is attached to the outer peripheral edge 70 of the rubber film 66.
Circumferential groove 90 which is opened on the superposed surface with
Is formed, and the opening of the peripheral groove 90 is covered with the lower metal plate 46 so that the second flow path extending in the circumferential direction between the overlapping surfaces of the outer peripheral edge 70 of the rubber film 66 and the lower metal plate 46. 74 can also be formed in the circumferential groove 90. The circumferential groove 90 is formed to have a length of less than one circumference in the circumferential direction, and one end in the circumferential direction is connected to the first flow path 72, while the other end in the circumferential direction is connected to the communication hole. The chamber 64 communicates with the equilibrium chamber 42.

When the second flow path 74 is formed by the peripheral groove 90 formed on the outer peripheral edge 70 of the rubber film 66 as described above, it is not necessary to form the concave groove 58 in the lower metal plate 46. Therefore, the shape of the lower metal plate 46 can be advantageously simplified. In FIGS. 11 to 14, members and portions 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.

In addition, in the above-described embodiment, a specific example in which the present invention is applied to the partition member mounted on the engine mount is shown. However, the present invention is also applicable to a partition member mounted on various fluid-filled mounts. Of course, it is applicable to members.

In addition, although not enumerated one by one, the present invention can be embodied in modes in which various changes, modifications, improvements, etc. are made based on the knowledge of those skilled in the art. As long as they do not depart from the spirit of the present invention, any of them are included in the scope of the present invention.
Needless to say.

[0042]

As is apparent from the above description, in the partition member having the structure according to the present invention, the space between the first partition plate and the second partition plate is partitioned by the outer peripheral edge of the movable film. Thereby, since the first and second flow paths constituting the orifice passage are respectively formed in the circumferential direction, without requiring a special member such as a partition plate, the orifice length of one or more turns in the circumferential direction, It can be secured easily and with a simple structure.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view showing an engine mount on which a partition member according to one embodiment of the present invention is mounted, and is a view corresponding to a II section of the partition member in FIG.

FIG. 2 is an exploded perspective view of a partition member mounted on the engine mount shown in FIG.

FIG. 3 is a plan view of a partition member mounted on the engine mount shown in FIG.

FIG. 4 is a sectional view taken along line IV-IV in FIG.

FIG. 5 is a sectional view taken along line VV in FIG. 3;

FIG. 6 is a plan view showing a partition member as another embodiment of the present invention.

FIG. 7 is a sectional view taken along the line VII-VII in FIG. 6;

8 is a sectional view taken along line VIII-VIII in FIG.

FIG. 9 is a sectional view taken along line IX-IX in FIG. 6;

FIG. 10 is a cross-sectional view showing a partition member as still another embodiment of the present invention.

FIG. 11 is a plan view showing a partition member as still another embodiment of the present invention.

FIG. 12 is a sectional view taken along line XII-XII in FIG. 11;

FIG. 13 is a sectional view taken along line XIII-XIII in FIG. 11;

FIG. 14 is a sectional view taken along line XIV-XIV in FIG. 11;

[Explanation of symbols]

 10, 82 Partition member 12 Engine mount 36 Fluid chamber 40 Pressure receiving chamber 42 Equilibrium chamber 44, 86 Upper metal plate 46, 88 Lower metal plate 52, 62 Through hole 54, 64 Communication hole 58 Recessed groove 66 Rubber film 68 Central part 70 Outside Peripheral part 72 First flow path 74 Second flow path 80 Orifice passage 90 Peripheral groove

Continuation of the front page (56) References JP-A-1-98722 (JP, A) JP-A-57-9340 (JP, A) JP-A-63-66643 (JP, U) JP-A-62-50343 (JP) , U) Actual opening 62-141941 (JP, U) (58) Fields investigated (Int. Cl. ⁶ , DB name) F16F 13/00

Claims (1)

(57) [Claims] 1. A fluid-filled mount having a fluid chamber filled with a predetermined incompressible fluid, which partitions the fluid chamber into two divided fluid chambers, and connects the two divided fluid chambers to each other. A fluid-filled mounting partition member comprising an orifice passage and a movable film capable of being displaced small based on the internal pressure difference between the two divided fluid chambers, wherein the first partition plate and the second partition plate overlap each other. In addition, the movable film is accommodated and arranged in a space formed between the overlapping surfaces of the two partition plates, and the outer peripheral edge portion of the movable film is made thicker so as to be pinched and held between the two partition plates. By partitioning the void at the outer peripheral edge of the movable film, a first flow path extending in the circumferential direction on the outer peripheral side of the outer peripheral edge, and the outer peripheral edge and the first or second partition plate And a second flow path extending in the circumferential direction between the overlapping surfaces with Both by caulking passed, communicating them first flow path and second flow path to each other,
A partition member for a fluid-filled mount, wherein the orifice passage is formed.