JPH1089402A - Liquid sealed-type mount equipment - Google Patents

Abstract

PROBLEM TO BE SOLVED: To exert effective vibration control effect against input vibration with a wide range of frequencies, based on the flow action of liquid flowing in an orifice channel by selectively developing and gaining two different tuning characteristics at a single orifice channel. SOLUTION: Around a communicating opening 72 to a balancing room 50 of an orifice channel 60, a flexible coat 44 making up the wall of the balancing room 50 is pushed and constricted by constraint members 74 and 78. Thereby, the communicating opening 72 is covered with the flexible coat 44 so that communicating to the balancing room 50 is enabled to be virtually blocked off, and under the condition of the virtual blocking-off the communicating opening 72 against the balancing room 50, a movable coat 84 is made up with covering area of the communicating opening 72 on this flexible coat 44.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a fluid-filled mounting device which obtains a vibration-proof effect by utilizing a flow action such as a resonance action of a fluid caused to flow through an orifice passage.
In particular, the present invention relates to a fluid-filled mounting device capable of switching vibration isolation characteristics by adjusting the communication state of an orifice passage.

[0002]

2. Description of the Related Art Conventionally, as a kind of a vibration-proof connecting body or a vibration-proof support which is interposed between members constituting a vibration transmitting system and suppresses the transmission of vibration, it is disclosed in Japanese Patent Application Laid-Open No. 60-104824. As is, the first mounting bracket and the second mounting bracket attached to each one member to be vibration-proof connected,
A part of the wall portion is formed of the main body rubber elastic body on both sides of the partition member supported by the second mounting bracket while being arranged at a predetermined distance from each other and connected to each other by the main body rubber elastic body. A pressure receiving chamber in which internal pressure fluctuations are generated at the time of vibration input, and an equilibrium chamber in which a part of a wall portion is formed of a flexible membrane and a volume change is easily allowed. There is known a fluid-filled mounting device having a structure in which a predetermined incompressible fluid is filled in each of the pressure receiving chambers and an orifice passage communicating the pressure receiving chamber and the equilibrium chamber with each other. In such a mounting device, based on a flow action such as a resonance action of the fluid caused to flow through the orifice passage, it is possible to easily obtain an anti-vibration effect, which is difficult to obtain only with the main rubber elastic body. For example, it is suitably used as an engine mount for an automobile.

In an engine mount or the like for an automobile, a vibration damping effect is required for a plurality of types of vibrations having different frequencies and amplitudes, which are input according to the situation. The frequency range in which the vibration damping effect based on the flow action of the fluid to be effectively exerted is determined by the cross-sectional area and length of the orifice passage, and is narrow. It is often difficult to achieve it satisfactorily.

Therefore, for example, Japanese Patent Application Laid-Open Nos. 62-88833 and 63-17347 disclose a valve element for opening and closing an orifice passage and controlling the communication of the orifice passage and the cutoff of the orifice passage. There has been proposed a structure in which the vibration isolation characteristics can be switched.
No. 3537 and JP-A-8-114249,
One of the two orifice passages tuned to different frequency ranges is controlled to be connected / disconnected by a valve body, so that the two orifice passages can function alternatively, and the vibration isolation characteristics of the mount can be switched to input vibration in a wide frequency range. There has been proposed a structure corresponding to the above.

However, even in the mounting device having such a structure, one orifice passage can exhibit an effective vibration damping effect only for input vibration in a specific frequency range in which the orifice passage is tuned. Because one orifice passage cannot provide an anti-vibration effect for input vibrations in multiple frequency ranges, even if the orifice passage is opened and closed to switch the anti-vibration characteristics, input vibration in another frequency range In order to obtain an effective vibration damping effect based on the fluid flow action, it is necessary to form another orifice passage. Therefore, in order to satisfy anti-vibration characteristics against input vibration in a wide frequency range, it is necessary to form a plurality of orifice passages tuned according to each frequency range, and it is inevitable that the structure becomes complicated. There was a problem.

In particular, since the orifice passage generally has a lower fluid flow resistance as the tuning frequency is higher, the second orifice passage tuned to a lower frequency range than the first orifice passage to be opened and closed is: The first orifice passage can function as an alternative to the first orifice passage according to the opening and closing of the first orifice passage.However, if a third orifice passage tuned to a higher frequency range than the first orifice passage to be opened and closed is provided. The fluid flow through the third orifice passage makes it difficult to secure the fluid flow through the first orifice passage even when the first orifice passage is in the open state. There was a problem that it was difficult to obtain.

For this reason, for an input vibration in a lower frequency range than the first orifice passage to be opened and closed, an effective vibration damping effect can be obtained by forming a second orifice passage tuned to a low frequency range. Although it is possible to obtain, it was difficult to obtain an effective vibration damping effect against input vibration in a high frequency range than the first orifice passage that is opened and closed, especially in the low frequency range and the middle frequency range. It has been extremely difficult to achieve an effective vibration damping effect with a simple structure over a wide range of high frequencies.

[0008]

Here, the present invention has been made in view of the above-mentioned circumstances, and the inventions according to claims 1 to 6 each have a vibration damping effect by an orifice passage that is opened and closed. To realize a fluid-filled mounting device with a simple structure that ensures a sufficient vibration proof effect even with input vibration in a frequency range higher than the original tuning frequency of the orifice passage while ensuring sufficient. With the goal.

A second aspect of the present invention is a fluid-filled mount capable of exhibiting an effective vibration damping effect with a simple structure over a wide range of low frequency range, middle frequency range and high frequency range. It is also an object to provide a device.

[0010]

According to a first aspect of the present invention, there is provided an electronic apparatus comprising: a first mounting member and a second mounting member arranged at a predetermined distance from each other; On the other hand, on both sides of the partition member supported by the second mounting member, 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 is An equilibrium chamber made of a flexible membrane is formed, an incompressible fluid is sealed in the pressure receiving chamber and the equilibrium chamber, and the first orifice passage communicating the pressure receiving chamber and the equilibrium chamber with each other is partitioned by the partition. In the fluid-filled mounting device provided on the member, a restraining member that is positioned on the opposite side of the flexible film and opposite to the partition member and is displaceable in the approaching / separating direction with respect to the partition member. And providing the flexible membrane to the partition member by the restraining member. By pressing the first orifice passage around the communication port to the equilibrium chamber and constraining it in a ring shape, the communication port is covered with the flexible membrane in a fluid-tight manner, and the flexible membrane is covered with the flexible membrane. It is characterized by a fluid-filled mounting device in which a deformable movable film is formed by a cover portion of the communication port.

In the fluid-filled mounting device having the structure according to the first aspect of the present invention, when the equilibrium chamber-side communication port of the first orifice passage is not covered, the first orifice passage is closed. While the original vibration-proof effect of the tuned orifice passage is exhibited, the first orifice passage is communicated with the first orifice passage under the condition that the communication port on the equilibrium chamber side is covered with the movable film. The wall of the equilibrium chamber is formed of a movable film, and the wall spring stiffness and the like change, so that the tuning of the first orifice passage changes, and the input vibration in the frequency range higher than the original tuning frequency range is reduced. On the other hand, the high dynamic spring caused by the closing of the first orifice passage is reduced or prevented, and the resonance effect and the hydraulic pressure absorbing effect of the fluid flowing through the first orifice passage are achieved. It is possible to obtain an effective vibration damping effect based on flow action.

That is, in such a fluid-filled mounting device, the vibration-proof effect of the first orifice passage is simply exhibited by opening and closing the communication port of the first orifice passage with the flexible film by the restraining member. Instead of being switched between the state and the state where the state is not exhibited, the frequency range where the vibration damping effect based on the flow of the fluid through the first orifice passage is exhibited is changed or changed. Therefore, it is possible to obtain an effective vibration damping effect against input vibrations in a plurality of or a wide frequency range by using one orifice passage, which is higher than the original tuning frequency range of the orifice passage. The improvement of the vibration isolation characteristics in the frequency range can be effectively achieved without requiring additional orifice passages or special mechanisms.

The invention described in claim 2 is the first invention.
In the fluid-filled mounting device having a structure according to the invention described in the above, the second orifice passage tuned to a lower frequency range than the first orifice passage and communicating the pressure receiving chamber and the equilibrium chamber with each other is provided. The partition member is provided in parallel with the first orifice passage, and an opening of the second orifice passage to the equilibrium chamber is provided,
The partition member is provided at a position deviated from a portion facing the restraining member.

In the fluid-filled mounting device having the structure according to the second aspect of the present invention, the first orifice passage is covered with the communication port on the equilibrium chamber side when the first orifice passage is covered.
The second orifice passage effectively exerts an anti-vibration effect against low-frequency vibration. That is, in a state where the equilibrium chamber-side communication port of the first orifice passage is not covered, the first orifice passage exhibits the original vibration damping effect against medium-frequency vibration, while the first orifice passage has the equilibrium chamber side. When the communication port is covered, the tuning of the first orifice passage is changed to exhibit the vibration damping effect against high frequency vibration, and the second orifice passage also exhibits the vibration damping effect against low frequency vibration. It is done.

Therefore, when the present invention is applied to, for example, an engine mount for an automobile, the communication port on the equilibrium chamber side of the first orifice passage is not covered when the vehicle stops, and the communication port on the equilibrium chamber side of the first orifice passage is covered when the vehicle is running. By
When the vehicle is stopped, an effective anti-vibration effect against idling vibration can be obtained, and when the vehicle is traveling, an anti-vibration effect against low-frequency vibration such as a shake and an anti-vibration effect against high-frequency vibration such as muffled sound can be advantageously obtained. It becomes possible.

[0016] The invention according to claim 3 provides the invention according to claim 1.
Or a biasing means for constantly biasing the restraining member in the approaching direction with respect to the partition member, and the restraining member is biased by the biasing means. A driving means for displacing the partition member in a direction away from the partition member against the urging force of the partition member. In addition, as the urging means, for example, a rubber elastic body, a coil spring, or the like is suitably adopted. Further, as the driving means, a negative pressure suction mechanism, an electromagnetic force mechanism, or the like is suitably employed.

In the fluid-filled mounting device having the structure according to the third aspect of the present invention, the communication port on the equilibrium chamber side of the first orifice passage is set to a cover state and an open state by a flexible film. The operation of the restricting member for switching can be performed more stably and excellent reliability is exhibited. In particular, if a negative pressure suction mechanism is adopted as the driving means, a special Since there is no need to incorporate a driving force generating mechanism, further simplification of the structure and weight reduction can be advantageously achieved.

The invention described in claim 4 is the first invention.
The fluid-filled mounting device having a structure according to any one of the first to third aspects, wherein the flexible film is a rubber elastic film at least in a cover portion of the communication port.

In the fluid-filled mounting device having the structure according to the fourth aspect of the present invention, the equilibrium chamber side in which the first orifice passage is communicated by the movable film constituted by the rubber elastic film. Since the wall spring stiffness of the wall portion is advantageously exerted, it is possible to tune the vibration isolation characteristics of the first orifice passage under the cover state by adjusting the spring characteristics of the rubber elastic film. In particular, the setting for shifting the tuning frequency to the high frequency range becomes easy.

The invention described in claim 5 is the first invention.
In the fluid-filled mounting device having a structure according to any one of the above-described aspects, a communication port of the first orifice passage to the equilibrium chamber is provided in a substantially central portion of the partition member. The cover portion for covering the communication port is constituted by a substantially central portion of the flexible film.

In the fluid-filled mounting device having the structure according to the fifth aspect of the invention, the flexible film (movable film) of the communication port on the equilibrium chamber side of the first orifice passage is provided.
Cover can be performed more easily and reliably, and the reliability and reliability of the switching operation of the vibration isolation characteristics are improved,
At the time of covering the equilibrium chamber side communication port of the first orifice passage using the flexible film, local stress concentration in the flexible film is advantageously avoided, and durability can be improved.

The invention according to claim 6 is the first invention.
6. The fluid-filled mounting device according to any one of claims 1 to 5, wherein the restraining member has a recess that opens toward the partition member, and an opening edge of the recess. By pressing the flexible film against the partition member to restrain the device in an annular shape, a closed air chamber is formed between the flexible film and the restraining member, which allows deformation of the movable film. It is characterized by the following.

In the fluid-filled mounting device having the structure according to the sixth aspect of the present invention, the fluid-filled mounting device is formed behind the movable film that closes the equilibrium chamber side communication port of the first orifice passage. The elasticity is advantageously imparted by the air spring action of the air chamber provided. Therefore, the spring rigidity of the movable membrane is improved, and the equilibrium chamber-side communication port of the first orifice passage is covered with the movable membrane, so that the tuning frequency of the first orifice passage shifts to a high frequency range. It can be achieved advantageously. Further, by utilizing the air spring action of the air chamber, even if the movable film itself does not have any elasticity, the movable film can be provided with elasticity. There is also an advantage that the degree of freedom in tuning the mounting characteristics can be advantageously secured. Note that the air spring action of the air chamber can be adjusted by changing the volume of the air chamber or the like.

[0024]

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

FIG. 1 shows an automobile engine mount 10 according to an embodiment of the present invention. In this engine mount 10, a first mounting member 12 and a second mounting member 14 arranged at a predetermined distance from each other are elastically connected by a main rubber elastic body 16 interposed therebetween. A first mounting bracket 12
By attaching the second mounting member 14 to each of the vehicle body side and the power unit side, the power unit is supported on the vehicle body in a vibration-proof manner. In addition, when the power supply unit is mounted on an automobile, the main rubber elastic body 16 is elastically deformed by the weight of the power unit, so that the first mounting bracket 12 and the second mounting bracket 14 are relatively displaced by a predetermined amount in a direction approaching each other. At the same time, the main vibration for the purpose of image stabilization is input in a substantially vertical direction in the figure. In the following description of the embodiments, the up-down direction means the up-down direction in FIG. 1 unless otherwise specified.

More specifically, the first mounting bracket 12 has a disk shape, and has a mounting bolt 18 protruding upward in the axial direction fixed at a central portion thereof. Thus, the first mounting member 12 is mounted on the power unit (not shown). At the base end of the mounting bolt 18, a support rod 20 projecting downward from the first mounting bracket 12 is provided.
Are formed integrally, and the umbrella fitting 2 extends outward in the direction perpendicular to the axis with respect to the protruding tip of the support rod 20.
2 is bolted.

On the other hand, the second mounting member 14 includes a cylindrical metal member 24 having a large diameter and a substantially cylindrical shape as a whole, and a bottom metal member 26 having a substantially bottomed cylindrical shape as a whole. The cylindrical metal fitting 24 has a step portion 28 formed at an intermediate portion in the axial direction, an upper portion in the axial direction being a small diameter portion 30 with the step portion 28 interposed therebetween, and a lower portion in the axial direction being a large diameter portion 3.
It is 2. In addition, a constricted portion 34 that is curved and protrudes inward is formed in the opening on the small diameter portion 30 side, and a caulking portion 36 is provided in the opening on the large diameter portion 32 side. On the other hand, the bottom fitting 26 is formed with a flange-like portion 38 that extends radially outward at the opening. An inner metal fitting 39 having a thin cylindrical shape with a bottom having a thickness slightly smaller than the bottom metal fitting 26 is fitted into and fixed to the inside of the bottom metal fitting 26.
9, the inner peripheral surface of the bottom fitting 26 is entirely covered.

Then, the flange-shaped part 38 of the bottom fitting 26 and the flange-shaped part 40 of the inner fitting 39 are overlapped,
By being caulked and fixed by the caulking portion 36 of the tube fitting 24, the bottom fitting 26 in which the inner fitting 39 is fitted and the tubular fitting 24 are overlapped in the axial direction and are connected to each other, whereby the second mounting The metal fitting 14 is formed as a whole with a deep, substantially bottomed cylindrical shape. A mounting bolt 41 protruding downward in the axial direction is fixed to the center of the bottom of the bottom fitting 26 so that the second mounting fitting 14 is attached to a body (not shown) by the mounting bolt 41. It has become.

The first mounting member 12 is disposed on the opening side of the second mounting member 14 at a predetermined distance on substantially the same axis. A main rubber elastic body 16 is interposed between the two mounting brackets 14. The main rubber elastic body 16 has a substantially truncated conical shape, and the first mounting member 12 is vulcanized and bonded to the small-diameter side end surface, and the second mounting member 1 is attached to the large-diameter side end outer peripheral surface.
4 is formed as an integral vulcanized molded product in which the constricted portion 34 is vulcanized and bonded, and the opening of the second mounting member 14 is
6 are fluid-tightly closed. A support rod 20 is projected from the large-diameter end surface of the main rubber elastic body 16, and an umbrella fitting 22 attached to the distal end of the support rod 20 is used as the cylindrical fitting 2 in the second fitting 14.
4 is located.

The large-diameter portion 32 of the cylindrical fitting 24 constituting the second fitting 14 is provided with a partition member 42 as a rigid member.
And a diaphragm 44 made of a thin rubber film as a flexible film are inserted and arranged so as to overlap each other, and between the step portion 28 and the caulking portion 36 of the cylindrical fitting 24, each outer peripheral edge portion is overlapped in the overlapping direction. And is fixed to the second mounting member 14. In addition, the diaphragm 44
A metal ring 46 is vulcanized and bonded to an outer peripheral edge of the metal ring to exert an effective holding force. The inside of the second mounting member 14 is fluid-tightly partitioned by the diaphragm 44, and a predetermined incompressible fluid is sealed only in the main body rubber elastic body 16 side of the diaphragm 44. In order to effectively obtain an anti-vibration effect based on the resonance action of the fluid, a low-viscosity fluid having a viscosity of 0.1 Pa · s or less, such as water, alkylene glycol, polyalkylene glycol, or silicone oil, is used as the sealed fluid. A fluid is advantageously employed.

Further, a partition member 42 is provided between the main rubber elastic body 16 and the diaphragm 44, so that the partition member 42 is located on both sides of the partition member 42, and a part of the wall portion is formed. A pressure receiving chamber 48, which is constituted by the rubber elastic body 16 and in which an internal pressure fluctuation is generated based on the elastic deformation of the main rubber elastic body 16 at the time of vibration input, and a part of the wall is constituted by the diaphragm 44, and the deformation of the diaphragm 44 Chamber 50 whose volume change is easily allowed based on
Are formed respectively. In the pressure receiving chamber 48,
The umbrella fitting 22 is accommodated and arranged so as to be positioned at a substantially central portion in the pressure receiving chamber 48 in a mounted state in which the main rubber elastic body 16 is elastically deformed by the weight of the power unit. Accordingly, an annular constricted flow path is formed around the umbrella bracket 22 and in which fluid flow is induced at the time of vibration input, and the outer peripheral edge of the umbrella bracket 22 is The stopper function in the rebound direction is exerted by contacting the constricted portion 34.

The partitioning member 42 has a structure in which an upper metal plate 52 and a lower metal plate 54 each having a substantially disk shape are overlapped with each other.
Since the central portion of the upper and lower plates 54 and 54 is formed into an uneven shape by press working or the like, the central portion extends circumferentially at a predetermined length between the overlapping surfaces of the upper and lower metal fittings 52 and 54. Orifice passages 60 in which the openings 56, 58 of the sections communicate with one of the pressure receiving chamber 48 and the balancing chamber 50, respectively.
Is formed, and extends at a predetermined length in the circumferential direction around the first orifice passage 60 at the outer peripheral portion. Openings 62 and 64 at both ends are formed in the pressure receiving chamber 48 and the equilibrium chamber 50, respectively. A communicating second orifice passage 66 is formed. In short, the first orifice passage 60 and the second orifice passage 66 are formed in parallel with each other between the pressure receiving chamber 48 and the equilibrium chamber 50 with the pressure receiving chamber 48 and the equilibrium chamber 50 communicating with each other. -ing Then, at the time of vibration input, the first orifice passage 60 and the second orifice passage 60 between the pressure receiving chamber 48 and the balancing chamber 50 are set based on the relative internal pressure fluctuation caused between the pressure receiving chamber 48 and the balancing chamber 50. Fluid flow through the orifice passage 66 is provided.

The second orifice passage 66 is set to have a smaller value of the ratio of the flow path cross-sectional area: A to the flow path length: L: A / L than the first orifice passage 60. Then, under the condition that the pressure receiving chamber 48 and the equilibrium chamber 50 are communicated with each other, a low dynamic spring effect based on the flow action such as the resonance action of the fluid is exerted when the medium frequency medium amplitude vibration such as the idling vibration is input. While the first orifice passage 60 is tuned, the second orifice passage 66 is tuned so as to exhibit a damping effect based on a flow action such as a resonance action of a fluid when a low frequency large amplitude vibration such as a shake is input.
Has been tuned.

Here, the first orifice passage 60
Is arranged such that a shallow bottom small-diameter inverted cup-shaped portion 70 formed at the center portion of the lower plate metal fitting 54 is inserted into a shallow bottom large-diameter inverted cup-shaped portion 68 formed at the center portion of the upper metal plate 52. As a result, the small-diameter inverted cup-shaped portion 70 is formed inside the large-diameter inverted cup-shaped portion 68.
The opening 64 of the first orifice passage 60 on the equilibrium chamber 50 side is formed by the small-diameter inverted cup-shaped portion 70 of the lower metal plate 54.
The partition wall 42 is formed at a central portion of the partition member 42 and is opened downward through a recessed communication port 72 formed by the small-diameter inverted cup-shaped portion 70.

Further, a press fitting 74 having a substantially inverted cup shape is disposed inside the inner fitting 39 fitted in the second mounting fitting 14 so as to be vertically displaceable, and is partitioned by a diaphragm 44. It is positioned on the side of the bottom metal fitting 26 (the inner metal fitting 39), that is, in a region where fluid is not sealed. Further, a cylindrical contact fitting 78 is fixed to the disc-shaped upper bottom of the pressing fixture 74, and the contact fitting 78 is axially above the outer peripheral edge of the upper bottom of the pressing fixture 74. It is projected toward. In addition, the contact fitting 78 has an opening peripheral portion,
It is curved radially outward, and its entire surface is covered with a covering rubber 80. As a result, the pressing fitting 74 is formed by the upper bottom portion of the pressing fitting 74 and the contact fitting 78.
Circular recess 8 opening upward at the upper bottom side
2, and the opening of the circular recess 82 is axially opposed to the communication port 72 provided in the partition member 42 with the diaphragm 44 interposed therebetween. The outer diameter of the opening of the contact fitting 78 is set to be larger than the opening of the communication port 72.

Further, a coil spring 76 is inserted into the inside of the press fitting 74, and is mounted in a state of being compressed and deformed by a predetermined amount between the upper bottom of the press fitting 74 and the bottom wall of the inner fitting 39. Have been. As a result, the urging force of the coil spring 76 is exerted on the pressing member 74, and the lower end of the pressing member 74 is lifted from the bottom wall of the bottom member 26, while being fixed to the upper bottom of the pressing member 74. The peripheral edge of the opening of the contact fitting 78 (opening end face of the peripheral wall of the circular recess 82) is pressed against the diaphragm 44, and the diaphragm 44 is closed by the peripheral edge of the opening of the communication port 72 in the lower metal fitting 54 of the partition member 42. Pressed against. That is,
Based on the urging force of the coil spring 76, the central portion of the diaphragm 44 is pressed and constrained by the periphery of the opening of the contact fitting 78 around the communication port 72 of the partition member 42. The opening of the communication port 72 is covered with the diaphragm 44 in a fluid-tight manner.

The opening 64 to the balance chamber 50 in the second orifice passage 66 is provided at a position where it can be maintained in a state of communication with the balance chamber 50 even when the diaphragm 44 is restrained by the contact fitting 78. I have. Further, the peripheral edge of the opening of the contact fitting 78 does not need to be bonded to the diaphragm 44. Further, as is clear from the above description,
In the present embodiment, including the pressing fitting 74 and the contact fitting 78,
A restricting member that presses and restricts the diaphragm 44 around the communication port 72 of the partition member 42 is configured.

The diaphragm 44 has a contact fitting 78.
Only the opening peripheral portion of the communication port 72 is constrained in an annular shape between the partition member 42 and the partition member 42, and a restraining force is exerted on a central portion of the diaphragm 44 that covers the opening of the communication port 72. No movable film 84 that allows elastic deformation
It has been. In particular, in the present embodiment, the movable film 84
Is thicker than the outer peripheral edge, and the spring rigidity of the movable film 84 is ensured. In a state where the diaphragm 44 is restrained by the circular recess 82 formed by the hollow hole of the contact fitting 78, an air chamber 86 sealed behind the movable film 84 (on the side opposite to the partition member 42) is formed. Has been formed,
The air chamber 86 allows the movable film 84 to bulge downward, and at the same time, when the movable film 84 is deformed, an air spring action based on the volume change of the air chamber 86 is exerted on the movable film 84. It is supposed to be.

Further, the press fitting 74 has a cylindrical wall portion whose diameter is enlarged in a tapered cylindrical shape, and a peripheral portion of the opening,
An annular plate-shaped pressure acting plate portion 88 extending radially outward is integrally formed. Further, a substantially annular plate-shaped support rubber plate 90 which extends radially outward from the outer peripheral edge of the pressure action plate portion 88 is vulcanized and bonded to the pressing fitting 74. A metal ring 92 is vulcanized and bonded to the outer peripheral edge of the metal ring 90. The metal ring 92 is press-fitted and fixed to the lower end of the peripheral wall of the inner fitting 39, so that the outer peripheral edge of the support rubber plate 90 is fitted and fixed to the inner peripheral surface of the inner fitting 39 in a fluid-tight manner. This allows
The inner part of the inner fitting 39 includes the pressing fitting 74 and the support rubber plate 9.
0, it is fluid-tightly divided into an opening side and a bottom side, so that on one side (opening side of the inner fitting 39) sandwiching the pressing fitting 74, a part of the wall is a diaphragm. 4
4 and a static pressure chamber 94 that allows the deformation of the diaphragm 44 is formed. On the other side (bottom side of the inner metal fitting 39) with the pressing metal 74 interposed therebetween, a sealed pneumatic chamber 96 is provided. Are formed.

An air pipe (not shown) is connected to the pneumatic action chamber 96 by a connection port 98. Through this air pipe, the pneumatic action chamber 96 is connected to a negative pressure source and the atmosphere. It is designed to be alternatively connected to the inside. Then, in a state where the pneumatic action chamber 96 is connected to the atmosphere, as shown in FIG. 1, the urging force of the coil spring 76 is exerted on the press fitting 74, and the contact fitting 78 sandwiches the diaphragm 44. Partition member 4
2, the communication port 72 of the first orifice passage 60 is covered with the movable membrane 84 in a fluid-tight manner,
The communication between the first orifice passage 60 and the balance chamber 50 is substantially cut off. On the other hand, in a state where the pneumatic action chamber 96 is connected to a negative pressure source and a negative pressure is applied, as shown in FIG. 2, the pressing is performed based on the pressure difference between the pneumatic action chamber 96 and the static pressure chamber 94. The metal fitting 74 is displaced toward the bottom wall side (downward in the figure) of the inner metal fitting 39 against the urging force of the coil spring 76, so that the pressing force on the diaphragm 44 is released and the diaphragm 44 is released. Is separated from the partition member 42, so that the communication port 72 of the first orifice passage 60 is
0 is maintained.

The pressing fitting 74 includes the pneumatic action chamber 9.
6 is provided, the operation area of the negative pressure applied to the pneumatic action chamber 96 is advantageously secured, and the pressure is reduced by a relatively small negative pressure. An effective driving force is easily applied to the metal fitting 74.

In the engine mount having the above-described structure, as shown in FIG. 2, a negative pressure is applied to the pneumatic action chamber 96 to release the restriction of the diaphragm 44 by the contact fitting 78. Below, both the first orifice passage 60 and the second orifice passage 66
The state where the pressure receiving chamber 48 and the equilibrium chamber 50 are communicated is maintained.
Therefore, at the time of vibration input, fluid flow through the first orifice passage 60 having a small fluid flow resistance can be effectively generated, and idling is performed based on the flow action of the fluid caused to flow through the first orifice passage 60. An excellent anti-vibration effect against medium frequency vibration during vibration is exhibited.

On the other hand, as shown in FIG. 1, the pneumatic action chamber 96 is opened to the atmosphere, the diaphragm 44 is restrained by the contact fitting 78, and the first orifice passage 60 is located on the equilibrium chamber 50 side. When the communication port 72 is covered with the movable film 84, the second orifice passage 66 is connected to the pressure receiving chamber 48.
The communication between the first orifice passage 60 and the equilibrium chamber 50 is substantially interrupted, and the first orifice passage 60 closes the opening of the communication port 72. By covering the movable chamber 84 with the cover, the equilibrium chamber 50 is partially divided so as to be switched to the communication state with the newly formed divided equilibrium chamber 100. The divided equilibrium chamber 100 is allowed to change in volume based on the elastic deformation of the movable membrane 84 that forms a part of the wall portion. Since the spring rigidity of the diaphragm 44 constituting the wall portion is sufficiently large, the first orifice passage 60
Is shifted to a higher frequency range than in a state where the tuning frequency range is communicated with the equilibrium chamber 50.

As a result, high-frequency vibration corresponding to booming noise or the like is prevented based on the flow action such as the resonance action of the fluid caused to flow between the pressure receiving chamber 48 and the divided balancing chamber 100 through the first orifice passage 60. The vibration effect is exerted effectively. In addition, the amount of fluid flowing through the first orifice passage 60 is limited by the elastic force or the spring stiffness accompanying the deformation of the movable membrane 84. Through the orifice passage 66, an effective vibration damping effect is exerted on the basis of a flow action such as a resonance action of the fluid which is caused to flow between the pressure receiving chamber 48 and the equilibrium chamber 50.

Therefore, when the vehicle is running, the pneumatic chamber 9
By connecting the air pressure working chamber 96 to the atmosphere and connecting the pneumatic chamber 96 to a negative pressure source when the vehicle is stopped, a vibration-proof effect against low-frequency vibrations such as shakes input during traveling and high-frequency vibrations such as muffled sounds can be obtained. Both of the anti-vibration effects against medium-frequency vibrations such as idling vibrations that are sometimes input can be exerted extremely advantageously.

Moreover, since the first orifice passage 60 tuned to the middle frequency range can provide an effective vibration damping effect even with respect to the input vibration in the high frequency range, the vibration damping characteristics in the high frequency range can be obtained. Improvement is achieved with a simple structure without adding another orifice passage tuned to the high frequency range or another vibration isolation mechanism, and exhibits excellent vibration isolation effect over a wide frequency range. The engine mount can be advantageously realized with a simple and compact structure.

The engine mount 10 of this embodiment is
Is an umbrella fitting 2 that forms an annular fluid flow path in the pressure receiving chamber 48.
2, the first orifice passage 60 covered with the movable film 84, such as a high-speed muffled sound.
Can be obtained based on the fluid flow action in the pressure receiving chamber 48 caused by the displacement of the umbrella fitting 22 than the input vibration in a higher frequency range than when the vibration damping effect is exhibited.

Further, in the engine mount 10 of the present embodiment, the switching of the restrained state of the diaphragm 44 by the contact fitting 78 is performed by the suction action of the member using the negative pressure, so that the driving force generating means is provided inside the mount. There is also an advantage that the mounting structure is simplified, the weight can be advantageously reduced, and the like.

Although the embodiment of the present invention has been described in detail above, the present invention is not to be construed as being limited by the specific structure and description shown in the embodiment.

For example, the driving means of the restraining member for restraining the flexible membrane by pressing it against the partition member is not limited to the structure using the coil spring and the negative pressure suction mechanism together as shown in the example. Various known driving means capable of exerting a sufficient driving force on the member in the approaching direction and the separating direction with respect to the partition member can be employed.

More specifically, as shown in FIGS. 3 and 4, for example, a permanent magnet 102 is fixedly mounted on a press fitting 74, and a coil 104 is disposed around the permanent magnet 102. And the pressing metal member 74 is separated from the partition member 42 against the urging force of the coil spring 76 by an electromagnetic force generated between the permanent magnets 102 by energizing the coil 104. An electromagnetic force mechanism adapted to be driven in the direction of movement can also be advantageously employed. In the figure, 106
Is a substantially annular yoke member made of a ferromagnetic material disposed around the coil 104 to form a magnetic path, and the coil 104 is connected to the second mounting member 14 via the yoke member 106. , And a permanent magnet 102 is provided so as to be movable in the axial direction in the center hole of the yoke member 106. FIG.
FIGS. 4 and 4 correspond to FIGS. 1 and 2, respectively, and to facilitate understanding, the same reference numerals are given to the corresponding members and parts, respectively, as in the above-described embodiment. I will keep it.

Further, behind the movable membrane 84 which covers the communication port 72 of the first orifice passage 60 on the equilibrium chamber 50 side,
It is not always necessary to form a closed air chamber 86,
For example, as shown in FIG. 3 and FIG. 4, it is also possible to provide a through hole 108 that communicates the air chamber 86 with an external space, depending on the required mounting characteristics and the like.

Furthermore, the specific shape and structure of the first orifice passage 60 and the second orifice passage 66 are appropriately determined according to the required characteristics of the mount.
It is not to be construed as limiting. Depending on the required characteristics of the mount, it is also possible to provide only the first orifice passage without providing the second orifice passage.

Depending on the shape and structure of the partition member and the orifice passage, the communication port of the first orifice passage to the equilibrium chamber may be formed in the outer peripheral portion of the partition member.

In addition, it goes without saying that the present invention can be advantageously applied to various types of mounting devices other than engine mounts for automobiles.

In addition, although not enumerated one by one, the present invention
Based on the knowledge of those skilled in the art, various changes, modifications, improvements, and the like can be made, and unless such embodiments depart from the spirit of the present invention.
Both are included in the scope of the present invention,
Needless to say.

[0057]

As is apparent from the above description, in the fluid-filled mounting device having the structure according to the first to sixth aspects of the present invention, the balance of the first orifice passage is controlled by the restraining member. By switching the communication port to the chamber between the state of communication with the equilibrium chamber and the state of covering with the movable film, the vibration isolation characteristics can be switched.

When the communication port is covered with the movable film, the tuning frequency of the first orifice passage is
Since the communication port is shifted to a higher frequency range than when the communication port is connected to the equilibrium chamber, the tuning characteristic of the first orifice passage is substantially changed, and therefore, a single orifice passage is effectively used. Thus, an effective anti-vibration effect can be obtained for input vibrations in a plurality of or wide frequency ranges.

[Brief description of the drawings]

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

FIG. 2 is an explanatory longitudinal sectional view showing another operation state of the engine mount shown in FIG. 1;

FIG. 3 is an explanatory longitudinal sectional view corresponding to FIG. 1, showing another specific example of a driving means that can be employed in the engine mount shown in FIG. 1;

4 is an explanatory longitudinal sectional view corresponding to FIG. 2 and showing another operation state of the driving means shown in FIG. 3;

[Explanation of symbols]

 REFERENCE SIGNS LIST 10 engine mount 12 first mounting bracket 14 second mounting bracket 16 main body rubber elastic body 42 partition member 44 diaphragm 48 pressure receiving chamber 50 balancing chamber 60 first orifice passage 66 second orifice passage 72 communication port 74 press fitting 76 Coil spring 78 Contact fitting 84 Movable membrane 96 Pneumatic action chamber 100 Divided equilibrium chamber

Claims (6)

[Claims] 1. A first mounting member and a second mounting member arranged at a predetermined distance from each other are connected by a rubber elastic body, and a partition member supported by the second mounting member is sandwiched. On both sides, a pressure receiving chamber in which a part of the wall is composed of the main rubber elastic body and an equilibrium chamber in which a part of the wall is composed of a flexible film are formed. A fluid-filled mounting device in which a non-compressible fluid is sealed in the chamber and a first orifice passage communicating the pressure receiving chamber and the equilibrium chamber with each other is provided in the partition member. A restricting member which is positioned on the opposite side of the partition member and is capable of being displaced in the approaching / separating direction with respect to the partition member; and the restricting member causes the flexible film to move in the first direction in the partition member. Pressing around the communication port of the orifice passage to the equilibrium chamber The communication port is fluid-tightly covered by the flexible film, and a deformable movable film is formed by the cover portion of the communication port of the flexible film. A fluid-filled mounting device characterized by the following. 2. A second orifice passage tuned to a lower frequency range than the first orifice passage and interconnecting the pressure receiving chamber and the equilibrium chamber with each other through the first orifice passage in the partition member. And an opening to the balancing chamber of the second orifice passage,
The fluid-filled mounting device according to claim 1, wherein the partition member is provided at a position separated from a portion facing the restraining member. 3. An urging means for constantly urging the restraining member toward the partition member in a direction approaching the partition member, and a separating direction from the partition member against the urging force of the urging means. 3. The fluid-filled mounting device according to claim 1, further comprising a driving means for displacing the mounting device. 4. The fluid-filled mounting device according to claim 1, wherein the flexible film is a rubber elastic film at least at a cover portion of the communication port. 5. A communication port of the first orifice passage to the equilibrium chamber is provided at a substantially central portion of the partition member, and the cover portion for covering the communication port is formed of the flexible member. 2. The film according to claim 1, wherein the film is constituted by a substantially central portion.
A fluid-filled mounting device according to any one of claims 1 to 4. 6. The restraining member has a recess that opens toward the partition member, and the flexible film is pressed against the partition member at an opening peripheral portion of the recess so as to be restrained in an annular shape. 6. The air chamber according to claim 1, wherein a sealed air chamber is formed between said flexible membrane and said restraining member, said air chamber allowing deformation of said movable membrane. Fluid-filled mounting device.