JP3198608B2 - Fluid-filled mounting device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

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

[0002]

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

[0003] In recent years, as one method for realizing higher vibration isolation characteristics, a predetermined portion of a wall portion is formed of a rubber elastic body in such a mounting device. Providing a fluid chamber in which an incompressible fluid is sealed,
2. Description of the Related Art A fluid-filled mounting device has been proposed in which the internal pressure of a fluid chamber generated at the time of vibration input is controlled to switch the vibration isolation characteristics according to input vibration or the like.

For example, Japanese Patent Application Laid-Open No. 60-8540 and Japanese Utility Model Application Laid-Open No. 139939/1985 disclose a diaphragm in which a part of a wall of a fluid chamber is elastically supported by a second support fitting. On the other hand, an electromagnetic coil is disposed behind the diaphragm, and the internal pressure of the fluid chamber is controlled by vibrating the diaphragm by the action of a magnetic field generated by the electromagnetic coil. In addition, there has been proposed an apparatus in which the mount anti-vibration characteristics are switched in accordance with input vibration or the like.

[0005] By the way, as disclosed in these publications, any of the driving mechanisms of the diaphragm in the fluid filled type vibration damping device having the conventional structure, as shown in the model diagram in FIG. A vibrating plate 2 is axially opposed to an electromagnet coil 4 disposed behind the vibrating plate 2 at a predetermined distance, and is arranged around the electromagnet coil 4 to form a magnetic path. Are divided on the surface facing the diaphragm 2 so that a magnetic field,
That is, the suction force F can be exerted.

However, in the drive mechanism having such a structure, the suction force F applied to the diaphragm 2 greatly depends on the distance x between the opposing surfaces between the yoke 6 and the diaphragm 2. There is a characteristic that it is. Therefore, when such a driving mechanism is applied to the above-described mounting device, it is difficult to perform high-precision amplitude control, and it is extremely difficult to stably obtain a required anti-vibration characteristic. .

In addition, the suction force applied to the diaphragm 2 is F
The distance between the opposing surfaces between the yoke 6 and the diaphragm 2 has a large dependence on x, so that in order to realize the desired anti-vibration control characteristics, it is necessary to increase the dimensional accuracy in the manufacture of the mount. Therefore, there is also a problem that it is difficult to manufacture the mount and it is unavoidable that the cost is increased.

[0008]

The present invention has been made in view of the above-mentioned circumstances, and an object of the present invention is to easily control an exciting force applied to a diaphragm. An object of the present invention is to provide a fluid-filled mounting device that can stably control the vibration of a plate and is easy to manufacture.

[0009]

A feature of the present invention to solve the above-described problem is that a first support fitting and a second support fitting arranged at a predetermined distance from each other are provided between them. A fluid chamber in which a predetermined incompressible fluid is sealed inside by forming a part of a wall with the rubber elastic body while being connected by an interposed rubber elastic body, A part of the wall of the chamber is constituted by a diaphragm elastically supported by a predetermined elastic member with respect to the second support fitting, and an electromagnet coil is disposed behind the diaphragm. A fluid-filled type in which the diaphragm is vibrated by the action of a magnetic field generated by the electromagnet coil.
In the mounting device, a yoke is provided so as to surround the electromagnet coil and forms a magnetic path around the electromagnet coil, and an inner hole of the electromagnet coil is provided on a surface of the yoke facing the diaphragm. a recess extending toward the provided while allowed to partial sectional said yoke in recess forming site, the diaphragm, enters the recess of such a yoke, the bottom surface and the inner circumferential surface of the recess, respectively,
Providing a suctioned body that is opposed to a predetermined gap , and further with respect to a surface of the yoke facing the diaphragm.
At a predetermined distance from each other, and
Providing a disk-shaped part extending outward integrally in the right angle direction,
The magnetic force of the electromagnet coil, together with the attracted body,
This is to be applied to the disk-shaped portion .

[0010]

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

FIG. 1 shows a specific example of an automobile engine mount manufactured according to the present invention.
In this figure, reference numeral 10 denotes a first support member, and 12 denotes a second support member, which are opposed to each other with a predetermined distance therebetween, and are provided with a rubber elastic body 1 interposed therebetween.
At 4, they are resiliently connected to each other. In the engine mount, one of the first support member 10 and the second support member 12 is attached to the power unit side or the body side, so that the power unit is supported on the body in a vibration-proof manner. Becomes

More specifically, the first support member 10 has an upper metal member 16 and a lower metal member 18 each having a substantially bottomed cylindrical shape having outer flange portions 20 and 22 provided on the periphery of the opening, respectively. And are bolted together at the outer flange portions 20 and 22. A mounting bolt 19 is provided on the bottom wall of the upper bracket 16 so as to protrude outward, and the first supporting bracket 10 is mounted on the power unit side or the body side by the mounting bolt 19. It is supposed to be.

Further, inside the first support fitting 10, between the upper and lower fittings 16, 18, the upper and lower fittings 1 are provided.
An empty space is formed by the concave portions 23 and 25 of 6,18. A flexible film 24 having a substantially thin disk shape is accommodated and arranged in this space, 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 mounted by. That is, the flexible film 24
Thus, the space is fluid-tightly divided into the recess 23 of the upper fitting 16 and the recess 25 of the lower fitting 18.

On the other hand, the second support member 12 has a substantially large diameter annular block shape, and is opposed to the lower metal member 18 of the first support member 10 at a predetermined distance in the axial direction. It has been impatient. And these first support fittings 10
A rubber elastic body 14 is interposed between the second elastic member 14 and the second supporting metal member 12, and the two elastic members 1
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 fitting 18 is fixed to the open end surface on the small diameter side, while the open end surface on the large diameter side. The axial end face of the second support fitting 12 is fixed to the second support fitting 12. That is,
The rubber elastic body 14 includes the lower bracket 18 and the second support bracket 1.
2 is formed as an integral vulcanized molded product.

The first support fitting 10 and the second support fitting 12 are connected to each other by the rubber elastic body 14, so that the first support fitting 10 and the second support fitting 12 are connected to each other through the inner hole of the second support fitting 12. A recess 26 is formed to open at the bottom.

Further, inside the second support fitting 12,
A diaphragm 27 is provided at the opening of the recess 26. A mounting ring 30 is attached to the outer peripheral edge of the diaphragm 27 via a ring-shaped connecting rubber 28 that extends radially outward.
Is fixed to the second support fitting 12 with a plurality of bolts 31, so that the vibration plate 27 is mounted on the second support fitting 12. That is, the diaphragm 27
Are attached to the second support fitting 12 so as to be displaceable based on the elastic deformation of the connecting rubber 28.

The opening of the recess 26 is fluid-tightly covered by mounting the vibration plate 27 on the second support fitting 12. A pressure receiving chamber 32 in which a predetermined incompressible fluid is sealed is formed therein. In addition, as such a sealing fluid, for example, water, alkylene glycol,
Polyalkylene glycol, silicone oil and the like are preferably used.

That is, in the pressure receiving chamber 32, a part of the wall portion is formed of the rubber elastic body 14, and the pressure receiving chamber 32 is provided between the first support fitting 10 and the second support fitting 12. At the time of the vibration input, 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 fluid chamber is constituted by the pressure receiving chamber 32.

On the other hand, the same incompressible fluid as that of the pressure receiving chamber 32 is filled in the recess 25 side of the lower fitting 18 in the space formed inside the first support fitting 10. Thereby, the equilibrium chamber 34 whose volume change is easily allowed based on the deformation of the flexible film 24 is formed by the concave portion 25 of the lower metal fitting 18. The space on the side of the concave portion 23 of the upper fitting 16 which is located on the opposite side of the equilibrium chamber 34 with the flexible film 24 interposed therebetween is an air chamber 36 which allows such deformation of the flexible film 24. I have.

Further, the pressure receiving chamber 32 and the equilibrium chamber 34
A disk fitting 38 is superimposed on a bottom wall portion of the lower fitting 18 which constitutes a partition wall for partitioning and is fixed by bolts.
The disk metal fitting 38 is provided with a circumferential groove 40 extending in the circumferential direction on a surface on which the lower metal fitting 18 is overlapped. Thereby, when they are superimposed on the lower bracket 18, between the overlapping surfaces of the disk bracket 38 and the lower bracket 18,
It extends by a predetermined length in the circumferential direction, and both ends in the circumferential direction pass through communication holes provided in the lower metal fitting 18 and the disc metal fitting 38,
An orifice passage 46 communicated with the pressure receiving chamber 32 and the balance chamber 34 is formed.

When an internal pressure fluctuation is caused in the pressure receiving chamber 32 at the time of the vibration input, the pressure between the pressure receiving chamber 32 and the equilibrium chamber 34 is changed.
When the fluid flows through the orifice passage 46, a predetermined vibration-proof effect is exhibited based on the fluid action or resonance action of the fluid. In the present embodiment, the length of the orifice passage 46 and the length of the orifice passage 46 are set so that a high damping effect can be exhibited when low-frequency, large-amplitude vibration such as a shake is input, based on the resonance action of the fluid flowing through the orifice passage 46. The area and the like are tuned.

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

Here, the yoke 50 has a bottomed cylindrical shape having a central core 52 projecting from the center of the bottom, and the electromagnet coil 48 is accommodated in an externally inserted state with respect to the central core 52. After that, the cylindrical wall opening is bent inward and superimposed on the axial end surface of the coil 48 to form a magnetic path surrounding the coil 48. An annular yoke 54 made of a ferromagnetic material is superimposed on the axial end face of the yoke 50 where the opening of the cylindrical wall is superimposed. A sufficient cross-sectional area can be ensured.

Further, in the yoke 50, the central core portion 52 is formed to have an axial length substantially equal to or shorter than the axial length of the electromagnet coil 48 (including the bobbin 56). ing. Thus, the magnetic path formed around the electromagnet coil 48 by the yokes 50 and 54 is formed between the protruding tip of the central core portion 52 and the portion overlapped on one end surface of the electromagnet coil 48 in the axial direction. , Which is substantially blocked. In addition, a concave portion is formed in the cut-off portion, in which 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 and 54 superposed on one axial end surface of the electromagnet coil 48. 58 is formed in the axial direction from one axial end face of the electromagnet coil 48 toward the inner hole 60.

The electromagnet coil 48 to which the yokes 50 and 54 are attached is as described above.
The first and second mounting brackets 62, 64 each having a substantially annular shape and fixed to each other in the axial direction by the bolts 61 are attached to the mounting brackets 62, 6.
4 and the second mounting bracket 6
4 is supported via an inner flange portion 68 provided on the base member 4. As a result, the electromagnet coil 48 is located at a predetermined distance behind the diaphragm 27, and the concave portions 58 provided in the yokes 50 and 54 are open toward the diaphragm 27 side. It is fixedly attached to the second support fitting 12.

The first and second mounting brackets 62, 62 for holding the electromagnet coil 48 and the yokes 50, 54 are provided.
64, the annular metal plate 66, and the bolt 61
In order to prevent a decrease in magnetic flux density in No. 4, it is desirable to form the nonmagnetic material such as aluminum.

On the other hand, the vibrating plate 27 opposed to the electromagnet coil 48 has an attracted body 70 projecting toward the electromagnet coil 48 and entering the recess 58 formed by the yokes 50 and 54. , Is fixed. Then, the sucked body 70 enters the recess 58 and is held in a state in which it is located at a predetermined distance from the bottom surface and the inner wall surface of the recess 58.

Further, a support portion 72 having a large-diameter disk shape, which extends in a direction perpendicular to the axis and extends outward beyond the yokes 50 and 54, is provided on the base side of the suction target body 70.
It is formed integrally. The outer peripheral edge of the support portion 72 is held in contact with the protruding distal end surface of a cylindrical elastic support member 74 provided on the annular metal plate 66. That is, the vibration plate 27 provided with the above-mentioned suction target 70 is elastically supported by the connecting rubber 28 and the elastic support 74 with respect to the second support fitting 12. . The elastic support 74
, A restraining ring 76 for preventing buckling deformation or the like is fixed.

Accordingly, in the engine mount having the above-described structure, when the electromagnet coil 48 is energized, the yokes 50 and 54 are magnetized, and the yokes 50 and 54 are inserted into the cut-out recess 58. A magnetic field can be generated, whereby a suction force directed downward in the axial direction can be exerted on the suction target 70 inserted and arranged in the recess 58.

The attracted body 70 attracted by the magnetic force of the electromagnet coil 48 is connected to the magnetic force of the electromagnet coil 48 and the connecting rubber 28 supporting the diaphragm 27.
And the elastic force of the elastic support 74 is displaced to a position where they are balanced with each other. Further, when the energization of the electromagnet coil 48 is stopped, the elastic force of the connecting rubber 28 and the elastic support 74 is based on the elastic force. Is returned to the position shown in FIG.

Therefore, by applying an alternating current to the electromagnet coil 48, the vibration plate 27 on which the to-be-attached body 70 is attached can be vibrated in the axial direction, and the vibration frequency and amplitude thereof can be adjusted. It can be controlled by the frequency and magnitude of the current flowing through the electromagnet coil 48. Then, the power supply to the electromagnet coil 48 is controlled, and the diaphragm 27 is changed according to the internal pressure fluctuation of the pressure receiving chamber 32 caused by the input vibration.
By vibrating the pressure, the internal pressure of the pressure receiving chamber 32 can be controlled, so that the anti-vibration characteristics of the mount can be appropriately changed.

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 flowing through the orifice passage 46, high damping characteristics can be exhibited. Diaphragm 27
Is vibrated in a phase opposite to the input vibration to absorb or reduce the internal pressure of the pressure receiving chamber 32, thereby exhibiting a low dynamic spring characteristic.

In addition, there, the object 70 to be sucked
In this case, since it is disposed in a state of being inserted into the magnetic field (recess 58) formed by the yokes 50 and 54, the suction force to the suction target 70 can be exerted stably. 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, the suction target 70 is disposed in the recess 58 of the yokes 50 and 54, A magnetic gap is formed not only between the axially opposed surface between the axial front end surface and the bottom surface of the concave portion 58 but also between the radially opposed surface between the outer peripheral surface of the suctioned body 70 and the inner wall surface of the concave portion 58. Thus, the magnetic field applied between the two opposing surfaces exerts a driving force on the to-be- sucked body 70.

In this case, the size y of the magnetic gap formed between the radially opposed surfaces of the suction target 70 and the recess 58 is maintained substantially constant irrespective of the displacement of the suction target 70. Since the suction target 70 can be displaced, even when the distance x between the radially opposed surfaces of the suction target 70 and the concave portion 58 is increased, the suction target 70 is affected. The attractive force (magnetic force) does not significantly decrease.

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

According to such an electromagnetic drive mechanism,
The influence on the controllability of the diaphragm 27 due to variations in the distance x, y between the opposing surfaces between the yokes 50, 54 and the suctioned body 70 caused by manufacturing errors and the like is advantageous. Therefore, the dimensional accuracy required at the time of manufacturing the mount can be relaxed, and the improvement of the mount manufacturability can be advantageously achieved.

In particular, in this embodiment, the support portion 72 provided integrally with the suctioned body 70 is also opposed to the axial end surfaces of the yokes 50 and 54 at a predetermined distance from each other. Since the magnetic force is also exerted on the support portion 72, the magnetic force by the electromagnet coil 48 can be exerted on the diaphragm 27 more efficiently. .

Next, FIG. 3 shows another specific example of the structure of the concave portion 58 formed with respect to the yokes 50 and 54. In the present embodiment, members and parts having the same structure as the first embodiment are given the same reference numerals as those in the first embodiment, and a detailed description thereof will be omitted. I decided to.

That is, in this embodiment, the yoke 5
The bottom surface of the concave portion 58 formed at 0, 54 has a substantially mortar shape, while the tip end of the suctioned body 70 is
8 has an inverted truncated cone shape corresponding to the bottom surface.

Then, similarly to the first embodiment, the sucked body 70 is inserted into the concave portion 58 and
Are positioned 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 end surface of the suction target 70 are opposed to each other with a tapered inclined surface, the suction target 70 is displaced. The amount of change in the distance between the opposing surfaces with respect to the bottom surface of the concave portion 58 when it is performed is suppressed to be substantially smaller than that in the first embodiment.
Can be more easily and stably controlled.

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

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

[0045]

Further, the depth of the recess 58 formed in the yokes 50 and 54 is not particularly limited. For example, as shown schematically in FIG. It is also possible to form the to-be-sucked body 70 having a length that reaches the inside of the inner hole 60 with a depth such that it can be disposed.

In addition, in the above-described embodiment, a specific example in which the present invention is applied to an engine mount for an automobile has been described. However, the present invention is also applicable to a body mount for an automobile and the like in various devices other than an automobile. Of course, the same can be applied to the vibration isolator.

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 implemented in an embodiment,
It goes without saying that all such embodiments are included within 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 mounting device having the structure according to the present invention, the to-be-attached body provided on the diaphragm is provided on the inner surface of the concave portion of the yoke for forming the magnetic field. On the other hand, not only in the vibration direction, but also in the direction perpendicular to the vibration direction, since the opposing position is set, even when such a sucked body is displaced,
The magnetic force is effectively exerted on the attracted body.

Therefore, the position dependency of the magnetic force (exciting force) exerted on the attracted body, and consequently on the diaphragm, with respect to the yoke can be effectively reduced, and the vibration control of the diaphragm can be effectively reduced. Can be performed easily and with high accuracy, whereby the desired anti-vibration characteristics of the mount can be advantageously and stably exhibited.

[Brief description of the drawings]

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

FIG. 2 is an explanatory diagram schematically showing an electromagnetic drive mechanism in the engine mount shown in FIG. 1;

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 an electromagnetic drive mechanism that can be employed in the engine mount shown in FIG. 1;

FIG. 5 is an explanatory diagram schematically showing an electromagnetic drive mechanism employed in a conventional mount device.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 First support metal fitting 12 Second support metal fitting 14 Rubber elastic body 24 Flexible membrane 27 Vibrating plate 28 Connecting rubber 32 Pressure receiving chamber 34 Equilibrium chamber 46 Orifice passage 48 Electromagnetic coil 50 Yoke 52 Central core 54 Auxiliary yoke 58 Recess Reference numeral 60 Inner hole 70 Suction target 72 Support part 74 Elastic support

Continuation of the front page (56) References JP-A-60-8540 (JP, A) JP-A-54-134310 (JP, A) JP-A-60-139939 (JP, U) JP-A-60-21577 (JP , U) (58) Field surveyed (Int. Cl. ⁷ , DB name) F16F 13/26 B60K 5/12

Claims (1)

(57) [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-conductive member is internally provided. A fluid chamber in which a compressive fluid is sealed is formed by forming a part of a wall with the rubber elastic body, and a part of the wall of the fluid chamber is formed with respect to the second support fitting. Along with being configured with a diaphragm elastically supported via a predetermined elastic member,
And it allowed disposed an electromagnet coil behind such diaphragm, by the action of a magnetic field produced caused by the electromagnet coil, in the fluid-filled mount which is adapted to vibrate the said diaphragm, so as to surround the electromagnetic coils A yoke for forming a magnetic path around the electromagnet coil, and a recess extending toward an inner hole of the electromagnet coil is provided on a surface of the yoke facing the diaphragm. while allowed to partial sectional said yoke in the formation region, on the diaphragm, enters the recess of such a yoke, the bottom surface and the inner circumferential surface of the recess, respectively, the suction body to be opposition position at a predetermined gap And further attached to the yoke.
Opposing the surface facing the diaphragm at a predetermined distance
Position, and integrally outward from the suctioned body in the direction perpendicular to the axis.
An extended disk-shaped portion is provided, and
A force is exerted on the disk-shaped portion together with the suction target.
Fluid-filled mount, characterized in that the the like.