JPH09280304A - Liquid sealing type mount device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To realize with a simple structure a liquid sealing type mount device which can allow two orifice passages to work selectively to change over vibration control characteristics thereof. SOLUTION: A first orifice passage 64 is formed on an outer circumference part of a partition member 50 which partitions a pressure receiving chamber 56 and a balance chamber 58 while a second orifice passage 66 is formed at a central part of the partition plate 50. At the same time, by energizing with a coil spring 86 a pressure member 82 located opposite to a communication hole 70 on the side of the balance chamber 58 of second orifice passage 66 sandwiching a flexible film 52, the flexible film 52 is pressed against the partition plate 50 to close the communication hole 70 of the second orifice passage 66. On the other hand, a permanent magnet is fixed to the pressure member 82, and at the same time, a coil member 72 is arranged on a circumference of the pressure member 82. An electro-magnetifc force is allowed to work by allowing electricity to pass through the coil member 72. Then the pressure member 82 is separated from the partition plate 50 against an energizing force of the coil spring 86 to open the communication hole 70 to pass through the second orifice passage 66.

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 mount device capable of switching vibration damping characteristics by selectively operating the first and second orifice passages.

[0002]

2. Description of the Related Art Conventionally, it has been disclosed in Japanese Patent Application Laid-Open No. 60-104824 as a type of vibration-proof coupling body or vibration-proof support body which is interposed between members constituting a vibration transmission system to suppress the transmission of vibration. As described above, the first mounting metal fitting attached to one member to be vibration-proof connected and the second mounting metal fitting attached to the other member to be vibration-proof connected are connected by the main rubber elastic body. On the other hand, on both sides of the partition member supported by the second mounting member, a part of the wall portion is constituted by the main rubber elastic body, and a pressure receiving chamber that causes internal pressure fluctuation at the time of vibration input, and one of the wall portion And a balance chamber which is configured by a flexible film and whose volume change is easily allowed, and which encloses a predetermined non-compressible fluid in the pressure receiving chamber and the balance chamber, respectively. Orient connecting equilibrium chambers to each other Office passage fluid-filled mount structure formed by providing a are known. In such a fluid-filled mount device, it is possible to easily obtain an anti-vibration effect, which is difficult to obtain only with the rubber elastic body, based on the flow action such as the resonance action of the fluid caused to flow through the orifice passage. For example, it is preferably used as an engine mount for automobiles.

In an automobile engine mount, generally, a plurality of types of vibrations having different frequencies and amplitudes are input, and a vibration damping effect is required for each of those vibrations. The frequency range in which the anti-vibration effect based on the action is effectively exhibited is narrow, and it is often difficult to achieve the required anti-vibration characteristics with a single orifice passage.

Therefore, Japanese Patent Laid-Open No. 60-113832, Japanese Utility Model Laid-Open No. 63-17347, and Japanese Utility Model Laid-Open No. 3-2074.
No. 3, etc., the ratio of cross-sectional area: A and length: L: A /
A first orifice passage and a second orifice passage having mutually different Ls are provided, and the opening / closing of the second orifice passage having a large A / L is controlled by the valve means so that the opening / closing is controlled by the valve means. A mounting device has been proposed in which the first orifice passage and the second orifice passage are selectively operated.

However, in the mount device having such a structure, it is necessary to dispose the valve means inside the pressure receiving chamber or the equilibrium chamber, and in addition, the driving force of the actuator arranged outside is valved. Since a driving force transmission mechanism for transmitting to the means is required, there is a problem that the structure is extremely complicated, manufacturability and cost efficiency are poor, and the size is large and heavy. There is a possibility that the fluid tightness may be lowered due to the arrangement of the driving force transmission mechanism.

Moreover, as described in the above publications, an electromagnetic coil is generally employed as the actuator for driving the valve means, and the opening portion of the second orifice passage which is opened under normal conditions is used. Is configured to drive the valve means to be closed by energizing the coil.Therefore, under a use condition in which the second orifice passage should be maintained in a closed state for a long time, the energization time in the coil is long. There are also problems such as excessive power consumption, and an increase in the amount of heat generated by the coil, which may cause heat damage to the mount components and the like.

On the other hand, in Japanese Patent Laid-Open No. 60231/1992, an air chamber is formed behind a flexible membrane forming the wall of the equilibrium chamber, and a negative pressure source is selectively connected to the air chamber. Then, a mounting device is disclosed which controls the communication state of the orifice passage by sucking the flexible membrane under negative pressure and suppressing the volume change of the equilibrium chamber. There is a problem that the durability may be reduced due to an unreasonable force being applied to the entire flexible membrane, and it is difficult to obtain a sufficient effect of blocking the orifice passages. When selectively operating the orifice passage of
There is also a problem in that it is inevitable that the structure becomes complicated and the size becomes large because two or more equilibrium chambers that communicate with the pressure receiving chamber through each orifice passage must be formed independently.

[0008]

The present invention has been made in view of the circumstances as described above, and a problem to be solved by the present invention is that the cross-sectional area and the length of the first and second orifice passages are It is an object of the present invention to provide a fluid-filled mount device capable of opening and closing the second orifice passage having a large ratio A / L by a simple mechanism.

Further, according to the present invention, even under a use condition in which the second orifice passage should be maintained in a closed state for a long time, troubles such as heat damage are prevented from occurring and excellent durability and stable vibration isolation are achieved. It is also a problem to be solved to provide a fluid-filled mount device capable of exerting effects.

[0010]

In order to solve such a problem, a feature of the present invention resides in: (a) a first attachment member attached to one member that is vibration-isolated and coupled;
(B) The other member having a tubular peripheral wall portion and having the opening of the tubular peripheral wall portion opposed to the first mounting member at a predetermined distance from each other and being vibration-coupled. (C) a main body rubber elastic body that is interposed between the first mounting member and the second mounting member to connect the two mounting members to each other; A partition member which is arranged in the tubular peripheral wall portion of the second mounting member so as to extend in a direction perpendicular to the axis, and whose outer peripheral edge portion is fixedly supported by the second mounting member; and (e) the partition member. On the other hand, it is formed on one side in the axial direction of the second mounting member, a part of the wall portion is constituted by the main body rubber elastic body, and a predetermined incompressible fluid is sealed inside. A pressure receiving chamber in which internal pressure fluctuation is caused by elastic deformation of the main rubber elastic body at the time of vibration input; It is formed on the other axial side of the second mounting member with respect to the cutting member, and part of the wall portion is made of a flexible film, and a predetermined incompressible fluid is enclosed inside. An equilibrium chamber in which the volume change is allowed by the deformation of the flexible film; and (g) the partition member is provided inside the partition member so as to extend in the circumferential direction,
A first orifice passage that connects the pressure receiving chamber and the equilibrium chamber to each other; and (h) a central portion of the partition member that extends in the circumferential direction inside the partition member. A second orifice passage having a larger cross-sectional area: A and length: L ratio: A / L than the first orifice passage, which communicates the chambers with each other; and (i) the first member in the partition member. The second orifice member is positioned axially opposite to the second mounting member with the flexible film interposed between the central portion of the second orifice passage and the communication hole to the equilibrium chamber. A pressing member disposed so as to be displaceable in the axial direction of the mounting member, and (j) by constantly exerting an elastic force on the pressing member to urge the pressing member toward the partition member, The flexible membrane is pressed against the partition member to cause the second orientation. An elastic member for closing a communication hole of the gas passage to the equilibrium chamber, (k) a permanent magnet fixed to the pressing member, and (l) arranged around the permanent magnet in the circumferential direction. , Is fixedly supported by the second mounting member, generates an electromagnetic force between the permanent magnet and the permanent magnet by energization, and displaces the pressing member away from the partition member against the biasing force of the elastic member. And a coil member that opens a communication hole of the second orifice passage to the equilibrium chamber by pressing the second orifice passage.

In such a fluid-filled mount device having a structure according to the present invention, the pressing member for pressing the flexible film against the partition member provided with the communication hole of the second orifice passage is elastic. Against the biasing force of the members,
Based on the electromagnetic force generated between the coil member and the permanent magnet, the second orifice passage can be switched from the cutoff state to the communication state by separating the second orifice passage from the partition member. By turning on / off the power supply to the coil member, the second orifice passage can be opened / closed.

Here, in such a mounting device, it is not necessary to dispose a special member for communicating / blocking the second orifice passage inside the pressure receiving chamber or the equilibrium chamber, so that the structure is simplified. Accordingly, the manufacturability can be improved and the manufacturing cost can be reduced, and the fluid tightness of the pressure receiving chamber and the equilibrium chamber can be advantageously ensured.

Further, in such a mounting device, when the coil member is not energized, the flexible membrane is pressed against the partition member by the pressing member biased by the elastic member, and the second orifice passage is blocked. Since the state is maintained, the power consumption and the heat generation of the coil can be reduced and the heat damage can be prevented under the use condition in which the second orifice passage should be kept closed for a long time.

Here, the shape and size of the permanent magnet,
The material and the like will be set in consideration of cost efficiency and weight so that an effective electromagnetic force (Lorentz force) is generated when the coil member is energized, but preferably has a ring shape, Further, a permanent magnet having both magnetic poles set at both radial edges is adopted, and the permanent magnet is arranged on the same axis as the coil member. If such a configuration is adopted, an electromagnetic force can be effectively generated between the coil member and the permanent magnet when the coil member is energized due to the relationship between the directions of the magnetic flux and the current.

The permanent magnet does not necessarily have to be arranged in a state where it is completely housed in the central hole of the coil member, and the relative displacement of the pressing member and thus the permanent magnet with respect to the coil member is also taken into consideration. It is also possible to dispose the coil member at a position axially protruding from the central hole of the coil member.
And, in particular, if the permanent magnets are arranged so as to project from the central hole of the coil member to both sides in the axial direction, respectively, the pressing member, and thus the permanent magnet, is displaced relative to the coil member when the coil member is displaced. The change in the applied magnetic flux density can be effectively reduced.

The permanent magnet does not necessarily have to be a single permanent magnet, and a plurality of permanent magnets may be provided at a predetermined distance in the central axis direction of the coil member. If such a configuration is adopted, the magnetic field due to the leakage flux of each permanent magnet is effectively acted on the coil member between the adjacent permanent magnets, and a large magnetic field and thus an electromagnetic force can be obtained more efficiently. Can be done.

Further, as the elastic member, a rubber elastic body or the like can be adopted, but a metal coil spring can be preferably adopted in consideration of heat resistance and the like.

[0018]

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 automobile engine mount 10 as an embodiment of the present invention. In this engine mount 10, a first mounting member 12 mounted on the power unit side and a second mounting member 14 mounted on the vehicle body side are elastically coupled by a main rubber elastic body 16 interposed therebetween. The power unit is designed to support the vehicle body in a vibration-proof manner. Further, when the power unit is mounted on a vehicle, the weight of the power unit is exerted between the first mounting member 12 and the second mounting member 14, so that the main rubber elastic body 16
Is elastically deformed, and the mounting members 12 and 14 are relatively displaced in a direction toward each other by a predetermined amount (FIG. 2).
Along with such a mounting state, the main vibration for the purpose of anti-vibration is input in the substantially opposing direction of the first mounting member 12 and the second mounting member 14 (substantially the vertical direction in the figure). It will be. In the following examples, the vertical direction means the vertical direction in FIG. 1 in principle.

More specifically, the first mounting member 12 is a mounting rod 24 in which mounting bolts 20 and 22 are integrally formed on both ends in the axial direction with respect to a mounting plate fitting 18 having a substantially flat plate shape.
Is formed by being inserted and fixed by one of the mounting bolts 20 (the upper side in the drawing). Then, the first mounting member 12 is fixed to a power unit (not shown) by a mounting bolt 20 protruding upward from the mounting plate fitting 18.
It should be noted that the mounting plate fitting 18 is integrally formed with a stopper piece 26 that extends outward from the outer peripheral edge portion and is bent downward in a U shape. Further, an umbrella metal fitting 28, which spreads in an umbrella shape outward in the direction perpendicular to the axis, is fixed to the other mounting bolt 22 (downward in the drawing) of the mounting rod 24.

On the other hand, the second mounting member 14 has a cylindrical metal fitting 30 having a cylindrical shape and a bottom metal fitting 32 having a bottomed cylindrical shape.
It is composed of The tubular fitting 30 has a flange portion 34 that spreads outward in the radial direction in the upper opening portion, and further projects radially outward from a part of the circumference of the flange portion 34 to make a flat plate-shaped contact. The part 36 is integrally formed. Further, a caulking portion 38, which projects outward in the radial direction and has a substantially U-shaped cross section and has a substantially stepped diameter, is integrally formed in the lower opening of the tubular fitting 30. On the other hand, the bottom metal fitting 32
Has a flange portion 40 that expands radially outward at the peripheral edge portion of the opening. Then, the tubular metal fitting 30 is axially superposed on the opening side of the bottom metal fitting 32, and the caulking portion 38 of the tubular metal fitting 30 is caulked and fixed to the flange portion 40 of the bottom metal fitting 32, so that they are fixedly combined. , So
The second mounting member 14 is formed as a whole having a deep bottomed cylindrical shape having a cylindrical peripheral wall portion. Further, the mounting bolt 4 is attached to the bottom wall portion 42 of the bottom metal fitting 30.
4 is projected downward and fixed, and the mounting bolt 4
4, the second mounting member 14 is fixed to the vehicle body (not shown).

The first mounting member 12 is arranged at a predetermined distance on the opening side of the second mounting member 14, and the first mounting member 12 and the second mounting member 14 are separated from each other. A main rubber elastic body 16 is interposed between them. The main rubber elastic body 16 has a substantially truncated cone shape as a whole, and the mounting plate fitting 18 of the first mounting member 12 is vulcanized and adhered to the end surface of the main rubber elastic body 16 on the small diameter side. The mounting rod 24 is arranged so as to penetrate through the central axis of the main rubber elastic body 16 and is vulcanized and bonded, while the inner peripheral surface of the end of the second mounting member 14 on the flange portion 34 side of the tubular metal fitting 30 is The main rubber elastic body 16 is vulcanized and adhered to the outer peripheral surface of the large-diameter side end portion. In short, the main body rubber elastic body 16 is formed as an integrally vulcanization molded product having the mounting plate metal fitting 18, the mounting rod 24, and the tubular metal fitting 30. The upper opening is fluid-tightly closed.

The main rubber elastic body 16 is made up of the tubular metal fitting 30.
So as to cover the inner peripheral surface of the tubular metal fitting 30, and extends in layers up to the inner peripheral surface of the tubular metal fitting 30, whereby a seal rubber 44 is formed on the inner surface of the caulked portion 38 of the tubular metal fitting 30. Furthermore, the lower end of the mounting rod 24 in the axial direction is projected downward from the main rubber elastic body 16, and
Since 8 is positioned inside the hollow of the tubular fitting 30, an annular constriction flow path 46 is formed between the outer peripheral edge portion of the umbrella fitting 28 and the peripheral wall portion of the tubular fitting 30.

The abutting portion 36 of the second mounting member 14 projecting from the tubular metal fitting 30 is covered with a cushioning rubber 48, and the mounting plate metal fitting 18 of the first mounting member 12 is provided.
Is positioned in the opening of the U-shaped stopper piece 26 at the position where the contact portion 36 is located on both sides in the main vibration input direction with respect to the stopper piece 26 when the mount is mounted on the vehicle (see FIG. 2). Then, the first attachment member 12 and the first attachment member 12 are made to face each other with a predetermined distance and abut on the stopper piece 26 of the corresponding contact portion 36 via the cushioning rubber 48.
The relative displacement amount of the second mounting member 14 is limited. In short, the abutment portion 36 and the stopper piece 26 constitute a stopper mechanism in the bounding direction and the rebounding direction.

Furthermore, inside the second mounting member 14,
A partition member 50 having a substantially thick disk shape as a whole, and a flexible rubber film 52 having a thin disk shape as a whole
Are superposed on each other, and their superposed outer peripheral edge portions are fluid-tightly and fixedly sandwiched at the crimped portions of the tubular metal fitting 30 and the bottom metal fitting 32, so that the second mounting is performed. It is located at an axially intermediate portion of the member 14. In addition, a substantially annular plate-shaped fixing member 54 is vulcanized and adhered to the outer peripheral edge portion of the flexible rubber film 52, and the fixing member 54 should be caulked and fixed to the second mounting member 14. Thus, the fixing strength of the outer peripheral edge portion of the flexible rubber film 52 to the second mounting member 14 is sufficiently secured. Further, below the fixing metal fitting 54, a substantially cylindrical supporting metal fitting 55 which is bent along the inner surface of the peripheral wall portion and extends downward from the flange portion 40 of the bottom metal fitting 32 is superposed, and the second mounting member 14 is attached. It is fixed by crimping against.

The lower opening of the tubular fitting 30 is closed by the partition member 50, so that a predetermined space is provided between the opposing surfaces of the main rubber elastic body 16 and the partition member 50 inside the tubular fitting 30. A pressure receiving chamber 56 in which an incompressible fluid is enclosed is formed. Since a part of the wall portion of the pressure receiving chamber 56 is formed of the main rubber elastic body 16, the internal pressure fluctuation is generated when the vibration is input. The enclosed fluid is preferably water, alkylene glycol, polyalkylene glycol, silicone oil, or the like, which has a viscosity of 0.1 Pa · s or less, in order to advantageously obtain a vibration damping effect based on the resonance action of the fluid. A low viscosity fluid is adopted.

Further, the pressure receiving chamber 56 is sandwiched by the partition member 50.
An equilibrium chamber 58, in which the same incompressible fluid as that of the pressure receiving chamber 56 is sealed, is formed between the opposing surfaces of the partition member 50 and the flexible rubber film 52 at a portion located on the opposite side. The balance chamber 58 is configured such that the volume change thereof is easily allowed based on the elastic deformation of the flexible rubber film 52 forming a part of the wall portion. The pressure receiving chamber 56 and the equilibrium chamber 58 are filled with the fluid by, for example, a partition member 50 or a flexible rubber for the integrally vulcanized molded product of the main rubber elastic body 16 having the first mounting member 12 and the tubular fitting 30. The assembly of the membrane 52 and the like can be easily performed by performing it in an incompressible fluid or the like.

Further, in the partition member 50, a substantially flat plate-shaped lower metal fitting 62 is superposed on the opening side of the upper metal fitting 60 having a shallow hat shape, whereby the upper metal fitting 6 is formed.
It has a hollow structure in which the opening 0 is covered by the lower metal fitting 62. In addition, a vertical wall 63 is provided upright on the lower metal fitting 62 so as to project toward the upper metal fitting 60 side and extend into the hollow portion. The vertical wall 63 partitions the hollow portion of the partitioning member 50, respectively. By extending inside the hollow portion of the partition member 50 and communicating both ends with one of the pressure receiving chamber 56 and the equilibrium chamber 58, the pressure receiving chamber 56 and the equilibrium chamber 5 are connected.
A first orifice passage 64 and a second orifice passage 66 that connect the eight to each other are formed.

Here, although not clearly shown in the drawings, the first orifice passage 64 has a partition member 50.
The outer peripheral portion of the second orifice passage 66 is formed so as to extend in the circumferential direction for a length of one round or more.
Is formed to have a flow passage cross-sectional area larger than that of the first orifice passage 64 and to extend in the central portion of the partition member 50 in the circumferential direction by a length of less than one round. That is, rather than the first orifice passage 64, the second orifice passage 6
No. 6 is the ratio of the flow passage cross-sectional area: A and the flow passage length: L: A / L
The value of is set to a large value,
As is known, as compared with the first orifice passage 64, the second orifice passage 66 is tuned so that the vibration damping effect based on the resonance phenomenon of the flowing fluid can be exhibited at the time of vibration input in a higher frequency range.

The communication hole 68 on the equilibrium chamber 58 side in the first orifice passage 64 and the second orifice passage 6
All of the communication holes 70 on the side of the equilibrium chamber 58 in 6 are opened so as to face the flexible rubber film 52, and the communication hole 68 of the first orifice passage 64 has the communication hole 68.
0 in the outer peripheral portion of the communication hole 7 of the second orifice passage 66.
Zeros are provided in the substantially central portion of the partition member 50, respectively.

Further, particularly in the present embodiment, the first orifice passage 64 is tuned so that the damping effect for low frequency vibration such as shaking can be exerted on the basis of the resonance action of the fluid that is made to flow therein. On the other hand, the second orifice passage 66 is tuned so that a low dynamic spring effect and thus a vibration insulation effect for medium frequency vibration such as idling vibration can be exerted based on the resonance action of the fluid that is made to flow therein. ing. In addition, with respect to high-frequency vibration such as muffled sound, the narrowed flow path 46 formed by the umbrella metal fitting 28 disposed in the pressure receiving chamber 56.
On the basis of the resonance action of the fluid flowing through
In order to exert an effective vibration damping effect, such a narrowed flow path 4
The size of 6 is tuned.

Further, the coil 72 is housed and arranged inside the bottom metal fitting 32 covered with the flexible rubber film 52. The entire surface of the coil 72 is covered with a protective material 74. The protective material 74 is bolted to a support fitting 55 that is caulked and fixed to the second mounting member 14, so that the coil 72 has a bottom. It is coaxially positioned and fixed in the metal fitting 32. In addition, the protective member 74 is provided with a guide hole 76 having a circular cross section that extends coaxially through the central hole of the coil 72, and covers the lower opening of the guide hole 76 so as to cover the cup. The lid-like metal fitting 80 is fixed to the lower surface of the protective member 74 by bolts. The protective material 74 is preferably formed of a ferromagnetic material such as iron in order to effectively obtain an electromagnetic force described later.

Further, a protective material 74 in which the coil 72 is embedded
A movable member 82 as a pressing member is arranged in the guide hole 76. The movable member 82 has a block shape with a circular cross section having an outer diameter dimension slightly smaller than the inner diameter of the guide hole 76, and is slidably inserted and arranged in the guide hole 76. By being guided by the inner peripheral surface of the coil 76, the coil 72 can be axially displaced in the center hole. Furthermore, a pressing projection 84 that projects upward in the axial direction is integrally formed at the upper end of the movable member 82, and the tip pressing surface 85 of the pressing projection 84 is formed.
However, with respect to the communication hole 70 of the second orifice passage 66 provided in the partition member 50 with the flexible rubber film 52 interposed therebetween,
The positions are opposed to each other in the axial direction (the displacement direction of the movable member 82).

Further, a coil spring 86 as an elastic member is provided below the movable member 82 in a state of being housed in the lid fitting 80, between the lower end surface of the movable member 82 and the bottom surface of the lid fitting 80. Therefore, the biasing force of the coil spring 86 is exerted in the direction of separating the movable member 82 from the lid fitting 80, in other words, in the direction of protruding the movable member 82 axially upward. Moreover, the coil spring 86 serves as the pressing protrusion 8 of the movable member 82.
Even when the movable member 82 is positioned at the upper moving end by abutting the partition member 4 on the partition member 50 via the flexible rubber film 52, the upward biasing force is continuously applied to the movable member 82. Thus, pre-compression in the compression direction is added and assembled. As a result, the movable member 82 is constantly urged upward by the coil spring 86, so that the movable member 82 moves upward under the condition that no force other than the urging force of the coil spring 86 is applied. The flexible rubber film 52 is held at the end and the flexible rubber film 52 is pressed against the partition member 50 by the pressing protrusion 84 of the movable member 82, and the communication hole 70 of the second orifice passage 66 is formed.
It is blocked by 2.

On the other hand, permanent magnets 88, 88 are embedded and fixed inside the movable member 82. These permanent magnets 88 have a ring shape, and are movable members 82.
Are arranged so as to be located on the same axis and at a predetermined distance in the axial direction. Also, these permanent magnets 88
Has both magnetic poles set on both radial edges, and the inner magnetic poles and the outer magnetic poles are the same. In short, each of the permanent magnets 88 is set so that the inner peripheral edge portion becomes the S pole and the outer peripheral edge portion becomes the N pole, as shown in the figure. In particular, in this embodiment, the distance between the axial inner surfaces of the permanent magnets 88, 88 is smaller than the axial length of the coil 72, and the distance between the axial outer surfaces of the permanent magnets 88, 88 is smaller. , So that it is larger than the axial length of the coil 72,
The arrangement interval of the two permanent magnets 88, 88 is set so that even if the movable member 82 is displaced,
The permanent magnets 88, 88 are set so that the magnetic flux density exerted on the coil 72 is not significantly reduced.

That is, in the engine mount 10 having the above-described structure, the coil 72 is positioned in the magnetic field of the permanent magnets 88, 88 fixed to the movable member 82. Since the coil 72 is wound orthogonally to the direction of the magnetic force line of 88,
By energizing the coil 72, an electromagnetic force (Lorentz force) according to Fleming's left-hand rule is generated in the coil 72, and the reaction force of this electromagnetic force is exerted on the permanent magnets 88, 88 and by extension, the movable member 82. The coil 7
In order to advantageously secure the magnetic flux density in the area where the two are arranged, it is desirable that the protective material 74 be formed of a ferromagnetic material such as iron.

By supplying a direct current to the coil 72 in a specific direction (in the present embodiment, a clockwise direction when viewed from the top surface of the coil), the reaction force of the electromagnetic force acts on the movable member 82. , The movable member 82 is pulled downward, and as a result, the movable member 82 is pulled axially downward against the biasing force of the coil spring 86, as shown in FIG. . This allows
The pressing protrusion 84 of the movable member 82 is separated downward from the partition member 50, and the closed state of the communication hole 70 of the second orifice passage 66 by the flexible rubber film 52 is released,
The second orifice passage 66 will be in communication.

In short, in the engine mount 10, when the coil 72 is not energized, the movable member 82 is pushed up by the urging force of the coil spring 86, so that the communication hole 70 of the second orifice passage 66 is closed. Therefore, the second orifice passage 66 can be maintained in the closed state, while the energization of the coil 72 causes the reaction force of the electromagnetic force to act so that the movable member 82 is biased by the coil spring 86. To the communication hole 70 of the second orifice passage 66.
Can be opened so that the second orifice passage 66 can be maintained in communication.

The second orifice passage 66 has a larger flow passage cross-sectional area to flow passage length ratio A / L than the first orifice passage 64, and has a small fluid flow resistance. Therefore, under the condition that the second orifice passage 66 is blocked, the fluid flow between the pressure receiving chamber 56 and the equilibrium chamber 58 at the time of vibration input is exclusively the first orifice passage 6.
4 through which the high damping effect against the low-frequency vibration due to the resonance action of the fluid made to flow through the first orifice passage 64 can be effectively exerted, while the second orifice passage 66 is in the communicating state. Then, the fluid flow through the second orifice passage 66 between the pressure receiving chamber 56 and the equilibrium chamber 58 is advantageously generated, and is based on the resonance action of the fluid causing the second orifice passage 66 to flow. The low dynamic spring effect against frequency vibration can be effectively exhibited.

Therefore, if the coil 72 is not energized when the vehicle is running, and the coil 72 is energized only when the vehicle is stopped, it is possible to prevent the first vibration from being generated when the vehicle is running, such as a shake. The vibration damping effect of the orifice passage 64 is effectively exerted, and the vibration damping effect of the second orifice passage 66 is effectively exerted against the idling vibration input when the vehicle is stopped.

In particular, the coil 72 is used when the vehicle is running.
It is not necessary to energize the
Since it is sufficient to energize the coil 72 only when the vehicle is stopped, which is much shorter than the traveling time, power consumption and heat generation due to energization of the coil 72 can be effectively suppressed.
Excellent durability can also be realized.

Further, in the engine mount 10 having the above-described structure, the partition member 50 has the first orifice passage 64 formed in the outer peripheral portion thereof and the second orifice passage 66 formed in the central portion thereof. From the above, the flow path length of the first orifice passage 64 can be advantageously ensured and can be advantageously tuned to a low frequency range, and the communication hole 70 of the second orifice passage 66 is substantially centered in the partition member 50. There is also an advantage that it is possible to efficiently secure a space for disposing the movable member 82 for opening and closing the communication hole 70, the coil 72, and the like.

In addition, in the engine mount 10, each member such as the movable member 82 and the coil 72 for communicating / blocking the second orifice passage 66 is arranged outside the pressure receiving chamber 56 and the equilibrium chamber 58. Since it is not necessary to dispose the fluid-filled region and the inside and outside of the fluid-filled region, excellent manufacturability and fluid tightness can be exhibited.

Further, in the engine mount 10 of the present embodiment, each member such as the movable member 82 and the coil 72 which communicates / blocks the second orifice passage 66 swells while protecting the flexible rubber film 52. Bottom metal fitting 32 that allows deformation
Since it is housed and arranged in the internal space, the space can be effectively used, and the mount can be made compact.

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

For example, although the coil spring 86 is adopted as the elastic member for exerting the elastic force on the pressing member in the above-described embodiment, various elastic members such as rubber elastic body may be used in addition to the coil spring or instead of the coil spring. It is also possible to employ an elastic member.

Further, as the permanent magnet fixed to the pressing member, a single permanent magnet or a permanent magnet divided into three or more can be adopted in addition to the exemplified ones. is there.

Furthermore, the pressing protrusion 8 of the flexible rubber film 52
The flexible rubber film 52 may be fixed to the pressing protrusions 84 in order to reduce or prevent damages due to rubbing or the like with respect to 4.

In addition, in the above-mentioned embodiment, a specific example of the present invention applied to an engine mount for an automobile is shown. However, the present invention can be applied to other body mounts, differential mounts, or various mounting devices other than automobiles. Any of them can be advantageously applied.

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.

[0051]

As is apparent from the above description, in the fluid-filled mount device having the structure according to the present invention, the second orifice passage is blocked while the coil member is not energized, While the vibration damping effect based on the flow action of the fluid that is made to flow through the one orifice passage is effectively exhibited, by energizing the coil member,
The second orifice passage is made to communicate with each other, so that the vibration damping effect based on the flow action of the fluid made to flow through the second orifice passage can be effectively exhibited. The vibration characteristics can be switched appropriately.

A pressing member, an elastic member, a permanent magnet, etc. for connecting / disconnecting the second orifice passage are all arranged outside the pressure receiving chamber and the equilibrium chamber, so that the fluid sealing area is provided. Excellent manufacturability and fluid tightness can be easily achieved because there is no need to provide them.

Further, when the coil member is not energized, the second orifice passage having a large ratio of the flow passage cross-sectional area to the length: A / L is maintained in the closed state. The present invention is particularly applicable to a mounting device, such as an engine mount, in which the vibration damping effect of the first orifice passage tuned to a low frequency region is longer than that of the second orifice passage, which requires a long time in use. It can be preferably applied, whereby the power consumption and heat generation amount of the coil member during use of the mount can be suppressed, and excellent durability and economical efficiency can be exhibited.

[Brief description of drawings]

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

2 is a longitudinal sectional view corresponding to FIG. 1, showing another operating state of the engine mount shown in FIG.

[Explanation of symbols]

 10 Engine Mount 12 First Mounting Member 14 Second Mounting Member 16 Main Rubber Elastic Body 50 Partitioning Member 52 Flexible Rubber Membrane 56 Pressure Receiving Chamber 58 Equilibrium Chamber 64 First Orifice Passage 66 Second Orifice Passage 70 Communication Hole 72 coil 82 movable member 84 pressing protrusion 86 coil spring 88 permanent magnet

Claims (3)

[Claims] 1. A first mounting member to be mounted on one of the vibration-proof connected members, and a cylindrical peripheral wall portion, and an opening of the cylindrical peripheral wall portion with respect to the first mounting member. A second mounting member, which is mounted on the other member that is anti-vibration-coupled and is opposed to each other at a predetermined distance, and is interposed between the first mounting member and the second mounting member. A main body rubber elastic body that connects the two members, and a cylindrical peripheral wall portion of the second mounting member that extends in a direction perpendicular to the axis, and is fixedly supported by the second mounting member on the outer peripheral edge portion. And a partition member formed on one side of the partition member in the axial direction of the second mounting member with respect to the partition member, and a part of the wall portion is formed of the main rubber elastic body and A predetermined incompressible fluid is sealed in, and elastic deformation of the main rubber elastic body occurs when vibration is input. A pressure receiving chamber that causes internal pressure fluctuation, and is formed on the other axial side of the second mounting member with respect to the partition member, and a part of the wall portion is formed of a flexible film. At the same time, a predetermined incompressible fluid is sealed inside, and the equilibrium chamber in which the volume change is allowed by the deformation of the flexible membrane, and inside the partition member, the outer peripheral portion of the partition member is circumferentially arranged. A first orifice passage that extends and connects the pressure receiving chamber and the equilibrium chamber to each other; and inside the partition member, the central portion of the partition member extends in the circumferential direction and is provided to the pressure receiving chamber. A second orifice passage that communicates the equilibrium chambers with each other and has a larger cross-sectional area: A and length: L ratio: A / L value than the first orifice passage; and the second orifice passage in the partition member. A communication hole to the equilibrium chamber of the orifice passage of The flexible film is sandwiched between the central portion and the second mounting member, and the second mounting member is axially opposed to the central portion and is displaceable in the axial direction of the second mounting member. The pressing member and the second flexible member are pressed against the partition member by constantly exerting an elastic force on the pressing member and urging the pressing member toward the partition member. An elastic member that closes a communication hole of the orifice passage to the equilibrium chamber, a permanent magnet fixed to the pressing member, and a second mounting member that is circumferentially arranged around the permanent magnet. Is fixedly supported by an electromagnetic force between the permanent magnet and the permanent magnet, and the pressing member is displaced away from the partition member against the biasing force of the elastic member. The balance of the orifice passage of And a coil member that opens a communication hole to the chamber. 2. The permanent magnet has a ring shape, both magnetic poles are set on both radial edges, and the permanent magnet is arranged on the same axis as the coil member. Item 2. The fluid-filled mount device according to Item 1. 3. The fluid-filled mount device according to claim 1, wherein a plurality of the permanent magnets are provided at a predetermined distance from each other in the central axis direction of the coil member.