JPH05280571A - Mount device sealed with fluid - Google Patents

Abstract

PURPOSE:To provide a mount device sealed with fluid wherein a vibration isolation characteristic can be easily controlled to further facilitate manufacture. CONSTITUTION:In a fluid sealing vibro-isolating device wherein a wall part of a fluid chamber 32 of inputting vibration is partly constituted of a vibration plate 27 and also vibration-exciting this vibration plate 27 by magnetic force of an electromagnet coil 48 arranged behind the plate 27, a recessed part 58 extended toward an inner hole of the electromagnet coil 48 is provided relating to yokes 50, 54, by which a magnetic path is formed about the electromagnet coil 48, to substantially divide the yokes 50, 54 in a location of forming this recessed part 58. On the other hand, an attracted unit 70, advanced into the recessed part 58 of these yokes 50, 54 and positioned to be opposed with a predetetermined space respectively relating to a bottom surface and an internal peripheral surface of the recessed part 58, is provided in the vibration prate 27.

Description

Detailed Description of the Invention

[0001]

TECHNICAL FIELD The present invention relates to a fluid-filled mount device,
In particular, the present invention relates to a fluid filled type vibration damping device capable of switching control of vibration damping characteristics by vibrating a part of a wall portion of a fluid chamber to control internal pressure.

[0002]

2. Description of the Related Art Conventionally, as a kind of a vibration-proof coupling body or a vibration-proof support body interposed between members constituting a vibration transmission system,
A mounting device having a structure in which a first support metal fitting and a second support metal fitting to be attached to each one of the members to be mutually connected are connected by a rubber elastic body interposed between the both metal fittings. It is known and is used, for example, as an engine mount for automobiles.

Further, in recent years, as one method for realizing a higher vibration-proof characteristic, in such a mounting device, a part of the wall portion is made of a rubber elastic body, and a predetermined inside is provided. Providing a fluid chamber filled with incompressible fluid,
A fluid-filled mount device has been proposed in which the vibration damping characteristics are switched and controlled in accordance with input vibration or the like by controlling the internal pressure of the fluid chamber caused when vibration is input.

For example, in Japanese Unexamined Patent Publication No. 60-8540 and Japanese Utility Model Laid-Open No. 60-139939, a diaphragm in which a part of a wall portion of a fluid chamber is elastically supported by a second support fitting is used. On the other hand, by placing an electromagnet coil behind the diaphragm, and vibrating the diaphragm by the action of the magnetic field generated by the electromagnet coil, the internal pressure of the fluid chamber can be controlled. Then, the one in which the mount anti-vibration characteristic is switched and controlled according to the input vibration or the like has been proposed.

By the way, in the drive mechanism of the diaphragm in the fluid filled type vibration damping device having the conventional structure as disclosed in those publications, as shown in the model diagram of FIG. The vibrating plate 2 is arranged so as to face the electromagnet coil 4 disposed behind it at a predetermined distance in the axial direction, and is arranged around the electromagnet coil 4 to form a magnetic path. Is divided on the surface facing the diaphragm 2, so that a magnetic field is generated against the diaphragm 2.
That is, the suction force: F can be exerted.

However, in the drive mechanism having such a structure, the attractive force F exerted on the diaphragm 2 largely depends on the distance x between the facing surfaces between the yoke 6 and the diaphragm 2. There is a characteristic that it ends up. Therefore, if such a drive mechanism is applied to the mount device as described above, it is difficult to control the amplitude with high precision, and it is extremely difficult to stably obtain the required vibration isolation characteristics. ..

Moreover, the suction force exerted on the diaphragm 2 is F
Since the distance between the facing surfaces between the yoke 6 and the diaphragm 2 has a large dependency on x, it is necessary to increase the dimensional accuracy at the time of manufacturing the mount in order to realize the desired anti-vibration control characteristics. However, there is a problem in that it is inevitable that the mount is difficult to manufacture and the cost is increased.

[0008]

The present invention has been made in view of the above circumstances, and a problem to be solved by the present invention is that the excitation force exerted on a diaphragm is easily controlled and the vibration is applied. It is an object of the present invention to provide a fluid-filled mount device that enables stable vibration control of a plate and is easy to manufacture.

[0009]

In order to solve such a problem, a feature of the present invention resides in that a first support fitting and a second support fitting that are arranged at a predetermined distance from each other are provided between them. A fluid chamber, which is connected by an interposed rubber elastic body and in which a predetermined incompressible fluid is enclosed, is formed by constituting a part of the wall portion by the rubber elastic body. A part of the wall of the chamber is composed of a vibration plate elastically supported by the second support fitting through a predetermined elastic member, and an electromagnet coil is arranged behind the vibration plate. Then, in a fluid filled type vibration damping device in which the vibration plate is vibrated by the action of a magnetic field generated by the electromagnet coil, the fluid filled vibration isolator is arranged so as to surround the electromagnet coil and surrounds the electromagnet coil. A yoke that forms a magnetic path is provided and A concave portion extending toward the inner hole of the electromagnet coil is provided on the surface of the yoke facing the diaphragm, and the yoke is substantially divided at the concave portion forming portion. The object of suction is to provide an object to be sucked into the recess and face the bottom surface and the inner peripheral surface of the recess with a predetermined gap therebetween.

[0010]

The embodiments of the present invention will now be described in detail with reference to the drawings in order to clarify the present invention more specifically.

First, FIG. 1 shows a specific example of an automobile engine mount manufactured according to the present invention.
In this figure, 10 is a first support metal fitting, and 12 is a second support metal fitting, which are arranged to face each other with a predetermined distance therebetween and are interposed between them.
At 4, they are elastically connected to each other. Then, in such an engine mount, one of the first support metal fitting 10 and the second support metal fitting 12 is attached to the power unit side or the body side so that the power unit is vibration-isolatedly supported with respect to the body. Becomes

More specifically, in the first support fitting 10, an upper fitting 16 and a lower fitting 18, each of which has a substantially bottomed cylindrical shape and are provided with outer flange portions 20 and 22 on the peripheral edges of the opening, are provided on the opening side. Are overlapped with each other and are bolted to each other at the outer flange portions 20 and 22. A mounting bolt 19 is provided on the bottom wall of the upper metal fitting 16 so as to project outward, and the first supporting metal fitting 10 is mounted on the power unit side or the body side by the mounting bolt 19. It is designed to be used.

Further, inside the first support fitting 10, between the upper and lower fittings 16 and 18, the upper and lower fittings 1 are provided.
A cavity is formed by the recesses 23 and 25 of 6 and 18. A flexible film 24 having a substantially thin disk shape is accommodated and arranged in the void, and the outer peripheral edge portion is sandwiched between the outer flange portions 20 and 22 of the upper and lower metal fittings 16 and 18. It is installed by. That is, this flexible film 24
Thus, the space is fluid-divided into the recess 23 side of the upper fitting 16 and the recess 25 side of the lower fitting 18.

On the other hand, the second support fitting 12 has a substantially large-diameter annular block shape, and is opposed to the lower fitting 18 of the first support fitting 10 at a predetermined distance in the axial direction. It has been confused. And these first support metal fittings 10
A rubber elastic body 14 is interposed between the second supporting metal fitting 12 and the second supporting metal fitting 12.
0 and 12 are elastically connected. The rubber elastic body 14 has a tapered cylindrical shape, and the outer peripheral surface of the cylindrical wall portion of the lower metal fitting 18 is fixed to the opening end surface on the small diameter side, while the opening end surface on the large diameter side is formed. On the other hand, the axial end surface of the second support fitting 12 is fixed. That is,
The rubber elastic body 14 includes a lower metal fitting 18 and a second support metal fitting 1.
2 is formed as an integrally vulcanized molded product.

The rubber elastic body 14 connects the first support metal fitting 10 and the second support metal fitting 12 so that the inner hole of the second support metal fitting 12 is provided between the first support metal fitting 10 and the second support metal fitting 12. A recess 26 that is open to the bottom is formed.

Further, inside the second support fitting 12,
A diaphragm 27 is arranged at the opening of the recess 26. Further, an attachment ring 30 is attached to the outer peripheral edge portion of the vibration plate 27 via a ring-shaped plate-shaped connecting rubber 28 that spreads outward in the radial direction.
The diaphragm 27 is attached to the second support fitting 12 by being fixed to the second support fitting 12 with a plurality of bolts 31. That is, this diaphragm 27
Is attached to the second support fitting 12 so as to be displaceable based on the elastic deformation of the connecting rubber 28.

By mounting the vibrating plate 27 on the second support fitting 12, the opening of the recess 26 is fluid-tightly covered. Then, the pressure receiving chamber 32 in which a predetermined incompressible fluid is sealed is formed therein. Examples of such an enclosed fluid include water and alkylene glycol,
Polyalkylene glycol, silicone oil and the like are preferably used.

That is, in the pressure receiving chamber 32, a part of its wall portion is constituted by the rubber elastic body 14, and the wall between the first supporting metal fitting 10 and the second supporting metal fitting 12 is provided. At the time of inputting vibration, the internal pressure fluctuation is caused based on the elastic deformation of the rubber elastic body 14.
As is apparent from this, in this embodiment, the pressure receiving chamber 32 constitutes a fluid chamber.

On the other hand, the same incompressible fluid as the pressure receiving chamber 32 is sealed in the recess 25 side of the lower metal fitting 18 among the voids formed inside the first support metal fitting 10. As a result, the recess 25 of the lower metal fitting 18 forms an equilibrium chamber 34 in which the volume change is easily allowed due to the deformation of the flexible film 24. The space on the side of the recess 23 of the upper metal fitting 16 which is located on the opposite side of the equilibrium chamber 34 with the flexible film 24 interposed therebetween serves as an air chamber 36 which allows the deformation of the flexible film 24. There is.

Furthermore, the pressure receiving chamber 32 and the equilibrium chamber 34
On the bottom wall portion of the lower metal fitting 18 that constitutes the partition wall for partitioning the and, a disk metal fitting 38 is superposed and fixed by bolts.
A circumferential groove 40 extending in the circumferential direction is provided on the disc fitting 38 on the overlapping surface with the lower fitting 18. As a result, when superposed on the lower metal fitting 18, between the overlapping surfaces of the disc metal fitting 38 and the lower metal fitting 18,
It extends in a predetermined length in the circumferential direction, and both ends in the circumferential direction are passed through communication holes provided in the lower metal fitting 18 and the disk metal fitting 38,
An orifice passage 46 communicated with the pressure receiving chamber 32 and the equilibrium chamber 34 is formed.

When an internal pressure fluctuation is induced in the pressure receiving chamber 32 at the time of vibration input, between the pressure receiving chamber 32 and the equilibrium chamber 34,
By causing the fluid to flow through the orifice passage 46, a predetermined vibration damping effect is exhibited based on the fluid flow action or resonance action. In the present embodiment, the length and cutoff of the orifice passage 46 are adjusted so that a high damping effect can be exerted when a low-frequency large-amplitude vibration such as a shake is input, based on the resonance action of the fluid made to flow through the orifice passage 46. Area etc. are tuned.

Further, an electromagnet coil 48 is arranged behind the diaphragm 27 which constitutes a part of the wall of the pressure receiving chamber 32. The electromagnet coil 48 is housed and arranged inside a yoke 50 formed of a ferromagnetic material such as iron. In the figure, 56 is a bobbin.

Therein, the yoke 50 has a bottomed cylindrical shape having a central core portion 52 projecting at the center of the bottom portion, and the electromagnet coil 48 is housed in an externally inserted state on the central core portion 52. After that, the cylindrical wall opening is bent and deformed inward, and is superposed on the axial end face of the coil 48, thereby forming a magnetic path surrounding the coil 48. Further, an annular plate-shaped auxiliary yoke 54 made of a ferromagnetic material is superposed on the axial end surface of the yoke 50 on which the cylindrical wall opening is superposed, and the magnetic path in such a portion is effectively used. The cross-sectional area can be sufficiently secured.

In the yoke 50, the central core portion 52 is formed to have an axial length substantially the same as or shorter than the axial length of the electromagnet coil 48 (including the bobbin 56). ing. As a result, the magnetic path formed around the electromagnet coil 48 by the yokes 50 and 54 is formed between the projecting tip end portion of the central core portion 52 and the portion superposed on the axial one end surface of the electromagnet coil 48. , It is essentially shut off. In the cut-off portion, a bottom surface is formed by the central core portion 52, and an inner wall surface is formed by inner peripheral surfaces of the yokes 50, 54 which are superposed on one end surface of the electromagnet coil 48 in the axial direction. 58 is formed in the axial direction from the axial one end surface of the electromagnet coil 48 toward the inner hole 60.

The electromagnet coil 48 having the yokes 50 and 54 assembled as described above is used as the second support fitting 1.
The first and second mounting members 62 and 64, which have a substantially annular shape and are axially superposed on each other and fixed by bolts 61, respectively, are mounted on the two mounting members 62 and 6.
An annular plate fitting 66 sandwiched between four and a second mounting fitting 6
It is supported via an inner flange portion 68 provided on the No. 4 unit. As a result, the electromagnet coil 48 is located behind the diaphragm 27 at a predetermined distance, and the concave portions 58 provided in the yokes 50 and 54 thereof are opened toward the diaphragm 27 side. It is fixedly attached to the second metal support 12.

The first and second mounting members 62, which hold the electromagnet coil 48 and the yokes 50, 54,
64, the annular plate fitting 66, and the bolt 61
In order to prevent the decrease in magnetic flux density in No. 4, it is desirable that the magnetic flux density is made of a non-magnetic material such as aluminum.

On the other hand, the vibrating plate 27 positioned opposite to the electromagnet coil 48 is provided with an attracted body 70 which projects toward the electromagnet coil 48 side and enters the recess 58 formed by the yokes 50 and 54. , Fixed. The aspirated body 70 enters the recess 58 and is held in a state of being opposed to the bottom surface and the inner wall surface of the recess 58 with a predetermined distance therebetween.

Further, on the base side of the sucked body 70, there is provided a support portion 72 in the form of a large-diameter disk which spreads in the direction perpendicular to the axis and extends outward from the yokes 50 and 54.
It is formed integrally. The outer peripheral edge portion of the support portion 72 is held in contact with the protruding tip end surface of the cylindrical elastic support member 74 provided on the annular plate fitting 66. That is, as a result, the vibration plate 27 having the suctioned body 70 as described above is elastically supported by the connecting rubber 28 and the elastic support body 74 with respect to the second support fitting 12. .. The elastic support 74
A restraint ring 76 for preventing buckling deformation and the like is fixed to the.

Therefore, in the engine mount having the above-described structure, by energizing the electromagnet coil 48, the yokes 50, 54 are magnetized, and the yokes 50, 54 are cut into the recessed portion 58. A magnetic field can be generated, and thereby, an attracting force that is axially downward can be exerted on the object to be attracted 70 that is inserted and arranged in the recess 58.

The attracted body 70 attracted by the magnetic force of the electromagnet coil 48 in this manner and the magnetic force of the electromagnet coil 48 and the connecting rubber 28 for supporting the vibration plate 27.
The elastic force of the elastic support 74 and the elastic force of the elastic support 74 are displaced to a position where they are in balance with each other, and when the energization to the electromagnet coil 48 is stopped, the elastic force of the connecting rubber 28 and the elastic support 74 is changed to the original value. It will be displaced back to the position of.

Therefore, by applying an alternating current to the electromagnet coil 48, the diaphragm 27 to which the attracted body 70 is attached can be excited in the axial direction, and its vibration frequency and amplitude are It can be controlled by the frequency and the magnitude of the current supplied to the electromagnet coil 48. Then, the energization of the electromagnet coil 48 is controlled, and the diaphragm 27 is responsive to the internal pressure fluctuation of the pressure receiving chamber 32 caused by the input vibration.
By vibrating, it is possible to control the internal pressure of the pressure receiving chamber 32, and thereby it is possible to appropriately change the vibration damping characteristics of the mount.

Specifically, for example, when a low frequency vibration is input, the diaphragm 27 is vibrated in the same phase as the input vibration,
By positively generating the internal pressure of the pressure receiving chamber 32 and increasing the amount of fluid that is made to flow through the orifice passage 46, high damping characteristics can be exerted, and when inputting medium to high frequency vibration, Diaphragm 27
By vibrating in a phase opposite to the input vibration to absorb or reduce the internal pressure of the pressure receiving chamber 32, a low dynamic spring characteristic can be exhibited.

Moreover, there, the suctioned body 70
In this case, since it is arranged so as to be inserted inside the magnetic field (recessed portion 58) formed by the yokes 50 and 54, the suction force to the suctioned body 70 can be stably exerted. Therefore, the vibration control of the diaphragm 27 can be performed with excellent accuracy.

More specifically, as shown in the model diagram of FIG. 2, since the attracted body 70 is disposed in the recess 58 of the yokes 50 and 54, the attracted body 70 is A magnetic gap is formed not only between the axially opposed surfaces of the axial tip end surface and the bottom surface of the recess 58, but also between the radially opposed surfaces of the outer peripheral surface of the suctioned body 70 and the recess 58. Therefore, the driving force is exerted on the attracted body 70 due to the magnetic field applied between the opposing surfaces.

The size: y of the magnetic gap formed between the radially facing surfaces of the object to be attracted 70 and the recess 58 is kept substantially constant regardless of the amount of displacement of the object to be attracted 70. Since the object 70 to be attracted can be displaced, even when the distance x between the radially opposed surfaces of the object 70 to be suctioned and the concave portion 58 becomes large, the object 70 to be attracted is exerted. The attractive force (magnetic force) does not drop significantly.

Therefore, according to such an electromagnetic drive mechanism, the amount of displacement of the attracted body 70, and hence of the diaphragm 27, can be easily controlled with high accuracy by controlling the energization of the electromagnet coil 48. Therefore, it becomes possible to obtain the desired vibration-damping property advantageously and stably.

Further, according to such an electromagnetic drive mechanism,
The influence exerted on the controllability of the diaphragm 27 due to variations in the distances x and y between the facing surfaces between the yokes 50 and 54 and the attracted body 70 caused by manufacturing errors or the like is advantageous. Therefore, the dimensional accuracy required at the time of manufacturing the mount can be relaxed, and the mount manufacturability can be advantageously improved.

In particular, in this embodiment, the supporting portion 72 integrally provided with the object to be attracted 70 is also opposed to the axial end faces of the yokes 50 and 54 at a predetermined distance. Since the magnetic force is exerted on the supporting portion 72, the magnetic force generated by the electromagnet coil 48 can be exerted on the diaphragm 27 more efficiently. ..

Next, FIG. 3 shows another specific structural example of the recess 58 formed in the yokes 50 and 54. In the present embodiment, the members and parts having the same structures as those in the first embodiment are designated by the same reference numerals as those in the first embodiment, and detailed description thereof is omitted. I decided to.

That is, in the present embodiment, the yoke 5
The bottom surfaces of the recesses 58 formed in the holes 0 and 54 are substantially mortar-shaped, while the tip end of the suctioned body 70 is the recess 5
8 is formed in an inverted truncated cone shape corresponding to the bottom surface.

Then, as in the first embodiment, the sucked body 70 is inserted into the concave portion 58, and the concave portion 58 is inserted.
Are located opposite to each other with a predetermined gap therebetween.

In the electromagnetic drive mechanism having such a structure, since the bottom surface of the concave portion 58 and the tip surface of the suctioned body 70 are positioned to face each other with the tapered inclined surface, the suctioned body 70 is displaced. The amount of change in the distance between the facing surfaces with respect to the bottom surface of the concave portion 58 when being depressed is suppressed to be substantially smaller than that in the first embodiment, and as a result, the suctioned body 70, and thus the diaphragm 27.
It is possible to more easily and stably control the vibration force exerted on the.

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

For example, in the above embodiment, the diaphragm 27 is
Although elastically supported by the connecting rubber 28 and the elastic support 74, other elastic members such as a coil spring and a leaf spring can be used instead of the elastic support 74.
Alternatively, the connecting rubber 28 alone may be elastically supported, and a leaf spring or the like may be used instead of the connecting rubber 28.

Further, in the above-described embodiment, the support portion 72 is formed integrally with the object to be attracted 70 so as to be opposed to the axial end faces of the yokes 50 and 54. However, the support portion 72 is not always necessary. It's not like that.

Further, the depth of the recess 58 formed in the yokes 50 and 54 is not particularly limited, and for example, as shown in a model in FIG. It is also possible to form the suctioned body 70 having such a depth that it can reach the inside of the inner hole 60 of 48.

In addition, in the above-mentioned embodiment, a specific example of the present invention applied to an engine mount for an automobile is shown, but in addition, the present invention is applicable to a body mount for an automobile or various devices other than the automobile. Needless to say, the same can be applied to the vibration isolator.

Although not listed one by one, the present invention is
Based on the knowledge of those skilled in the art, it can be implemented in various modified, modified, and improved modes, and
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.

[0049]

As is apparent from the above description, in the fluid-filled mount device having the structure according to the present invention, the object to be attracted provided on the vibrating plate is provided on the inner surface of the concave portion of the yoke that forms the magnetic field. On the other hand, not only the vibration direction but also the direction perpendicular to the vibration direction are opposed to each other, so that even when such an object to be attracted is displaced,
The magnetic force is effectively exerted on the object to be attracted.

Therefore, the position dependency of the magnetic force (exciting force) exerted on the object to be attracted, and further on the diaphragm, with respect to the yoke can be effectively reduced, and the excitation control of such diaphragm is possible. Therefore, the desired mount vibration-damping characteristics can be advantageously and stably exhibited.

[Brief description of drawings]

FIG. 1 is a vertical cross-sectional view showing an engine mount as one embodiment of the present invention.

2 is an explanatory view showing a model of an electromagnetic drive mechanism in the engine mount shown in FIG. 1. FIG.

FIG. 3 is a longitudinal sectional view showing an engine mount as another embodiment of the present invention.

FIG. 4 is an explanatory diagram schematically showing another specific example of the electromagnetic drive mechanism that can be adopted in the engine mount shown in FIG. 1.

FIG. 5 is an explanatory view showing a model of an electromagnetic drive mechanism used in a conventional mount device.

[Explanation of symbols]

 10 1st support metal fittings 12 2nd support metal fittings 14 Rubber elastic body 24 Flexible film 27 Vibrating plate 28 Connection rubber 32 Pressure receiving chamber 34 Equilibrium chamber 46 Orifice passage 48 Electromagnet coil 50 Yoke 52 Central core portion 54 Auxiliary yoke 58 Recessed portion 60 inner hole 70 attracted body 72 support part 74 elastic support body

Claims (1)

[Claims] 1. A first support fitting and a second support fitting, which are arranged at a predetermined distance from each other, are connected by a rubber elastic body interposed therebetween, and a predetermined non-fitting member is provided inside. A fluid chamber in which a compressive fluid is enclosed is formed by forming a part of the wall portion with the rubber elastic body, and a part of the wall portion of the fluid chamber is formed with respect to the second support fitting. It is composed of a diaphragm elastically supported through a predetermined elastic member,
In a fluid filled type vibration damping device in which an electromagnet coil is disposed behind such a diaphragm and the diaphragm is vibrated by the action of a magnetic field generated by the electromagnet coil, the electromagnet coil is surrounded. And a yoke that forms a magnetic path around the electromagnet coil is provided, and a concave portion that extends toward an inner hole of the electromagnet coil is provided on a surface of the yoke that faces the diaphragm. While the yoke is substantially divided at the recess forming portion, the diaphragm is inserted into the recess of the yoke and is positioned so as to face the bottom surface and the inner peripheral surface of the recess with a predetermined gap therebetween. A fluid-filled mount device characterized by being provided with an object to be attracted.