JP2827844B2 - Fluid-filled mounting device - Google Patents

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 used for an engine mount of an automobile or the like, and in particular, to a driving force by using electromagnetic driving means (in addition to those using electromagnetic force, by directly using magnetic force by an electromagnet). The present invention relates to a fluid-filled mounting device capable of switching the vibration isolation characteristics from the outside by vibrating a wall portion of a fluid chamber by using the above method and controlling the internal pressure of the fluid chamber.

[0002]

2. Description of the Related Art Conventionally, as one type of a vibration isolator interposed between members constituting a vibration transmission system, such as an engine mount for an automobile or a suspension bush, one of members to be vibration-isolated is connected to each other. There is known a structure in which a first mounting bracket and a second mounting bracket to be mounted are connected by a rubber elastic body interposed between the two mounting brackets.

[0003] In recent years, as one technique for realizing higher vibration isolation characteristics, a fluid chamber in which a predetermined incompressible fluid is sealed is formed by a rubber elastic body with a part of a wall portion. And another part of the wall of the fluid chamber is constituted by a displaceable vibration plate, and this vibration plate is vibrated by an actuator, so that the vibration of the fluid chamber caused at the time of vibration input is generated. 2. Description of the Related Art A fluid-filled mounting device has been proposed in which an anti-vibration characteristic is switched according to input vibration or the like by controlling an internal pressure.

In such a fluid-filled mounting device, as an actuator for applying a driving force to a diaphragm, a magnetic force or an electromagnetic force by a solenoid or the like is used as shown in Japanese Utility Model Laid-Open No. 3-73741. The electromagnetic drive means thus used can be easily operated and controlled by an electric signal such as a voltage or a current, so that it is suitably used.

However, in such an electromagnetic driving means, when the energizing current is increased, problems such as deterioration of the durability of the rubber member and deterioration of the performance of the magnet due to heat generation occur, and when a large magnet is employed, the mounting weight increases. It is difficult to sufficiently obtain the driving force required for the vibration of the diaphragm due to the problem described above. Particularly, when the input vibration load to the mounting device is large, such as in an engine mount for an automobile, In addition, the internal pressure of the fluid chamber does not change as much as desired, and there is a problem in that it is difficult to obtain a sufficient effect of switching the vibration damping characteristics in practical use.

[0006]

The present invention has been made in view of the above-mentioned circumstances, and an object of the present invention is to increase a driving force by an electromagnetic driving means, and thereby to generate a large amount of heat and weight. The present invention provides a fluid-filled mounting device which can be advantageously achieved without increasing the pressure, whereby a change in the internal pressure of the fluid chamber is effectively generated, and the desired vibration damping characteristics can be stably obtained. Is to do.

[0007]

In order to solve such a problem, a feature of the present invention is that a first fitting and a second fitting are attached to a rubber elastic body interposed therebetween. And a fluid chamber in which a predetermined incompressible fluid is sealed, a part of a wall portion is formed by the rubber elastic body, and another portion of the wall portion of the fluid chamber is provided. A fluid-filled mounting device, comprising a diaphragm supported to be displaceable with respect to the second mounting bracket, and provided with electromagnetic driving means for exciting the diaphragm. A vibration plate having an area smaller than that of the vibration plate is disposed behind the vibration plate so as to be displaceably supported with respect to the second mounting bracket, and a predetermined incompressible fluid is provided between the vibration plate and the vibration plate. Form a working chamber in which the electromagnetic drive is provided. Attach the output shaft of the stage is that the driving force of said electromagnetic driving means has to be exerted on the diaphragm via the working chamber.

[0008]

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 a specific example of an automobile engine mount having a structure according to the present invention. Such an engine mount includes a first mounting bracket 10 and a second mounting bracket 12 attached to one of the power unit side and the body side, and the two mounting brackets 10 and 12 are spaced apart from each other by a predetermined distance. They are arranged facing each other at a distance and are mutually connected by a rubber elastic body 14 interposed therebetween. In this engine mount, the rubber elastic body 14 is elastically deformed when a power unit load is applied between the first mounting bracket 10 and the second mounting bracket 12 in a state where the rubber elastic body 14 is mounted on the vehicle. One mounting bracket 10 and second mounting bracket 12
Are displaced by a predetermined amount in the approaching direction, and the main vibration to be damped is input in a substantially opposing direction of the first fitting 10 and the second fitting 12.

More specifically, the first mounting member 10 includes an upper metal member 20 and a lower metal member 22 each having a substantially bottomed cylindrical shape in which outer flange portions 16 and 18 are provided on the periphery of the opening, respectively.
The outer flange portions 16 and 1 are overlapped with each other on the opening side.
8 are connected by bolts. A mounting bolt 24 protrudes outward from the bottom wall of the upper bracket 20, and the first mounting bracket 10 is mounted on the power unit side or the body side by the mounting bolt 24. It is supposed to be.

In a space formed inside the first mounting member 10, a flexible film 26 having a substantially thin disk shape is provided with its outer peripheral edge outside the upper and lower metal members 20,22. The space is provided by being sandwiched between the flange portions 16 and 18, and the space is formed by the flexible film 26.
It is fluid-tightly divided into the 0 side and the lower fitting 22 side. The space on the side of the upper fitting 20 is an air chamber 28 that allows deformation of the flexible film 26, while the space on the side of the lower fitting 22 is filled with a predetermined incompressible fluid. The equilibrium chamber 3 in which the volume change is allowed based on the deformation of the flexible film 26
0 is formed.

The fluid sealed in the equilibrium chamber 30 is generally a low-viscosity fluid such as water, an alkylene glycol, a polyalkylene glycol, or a silicone oil in order to effectively obtain an anti-vibration effect based on the resonance action of the fluid. Is preferably adopted.

Further, on the bottom wall of the lower metal fitting 22, orifice metal fittings 32 and 34 each having a substantially disk shape are provided.
An annular flow path extending in the circumferential direction is formed between the superposed surfaces of the orifice fittings 32 and 34 and the lower fitting 22 so as to be overlapped from both inner and outer surfaces and fixed by bolts. These annular flow paths are communicated with each other through a through hole 36 provided in the bottom wall portion of the lower metal fitting 22, thereby extending a predetermined length in the circumferential direction, and allowing the equilibrium chamber 30 to be connected to a pressure receiving chamber described later. An orifice passage 40 communicating with 38 is formed.

On the other hand, the second mounting member 12 has a substantially annular shape, and is substantially coaxially opposed to the first mounting member 10 at a predetermined distance in the axial direction. .
A rubber elastic body 14 is interposed between the second mounting bracket 12 and the first mounting bracket 10, and the two mounting brackets 10 and 12 are connected by the rubber elastic body 14. .

The rubber elastic body 14 has a tapered thick cylindrical shape, and the outer peripheral surface of the cylindrical wall portion of the lower metal fitting 22 constituting the first mounting metal fitting 10 has a small-diameter opening. On the other hand, the second mounting member 12 is fixed to the large-diameter opening. That is, the rubber elastic body 14
It is formed as an integrally vulcanized molded product having the lower fitting 22 and the second mounting fitting 12.

Further, a first support fitting 44 having a substantially annular plate shape is axially overlapped with the second fitting 12 via an annular spacer fitting 42. 12 are bolted fluid tightly. Further, a disc-shaped first rubber elastic film 48 is provided in the central hole 46 of the first support fitting 44, and the outer peripheral edge thereof is vulcanized to the inner peripheral edge of the first support fitting 44. Glued. As a result, the center hole 46 of the first support fitting 44 and the opening of the second mounting fitting 12 are closed in a fluid-tight manner, and the predetermined elasticity of the rubber elastic body 14 is reduced. A pressure receiving chamber 38 in which a fluid is sealed is formed.

That is, in the pressure receiving chamber 38, when a vibration is input between the first fitting 10 and the second fitting 12, the internal pressure fluctuation is caused by the elastic deformation of the rubber elastic body 14. In this embodiment, as described above, the pressure receiving chamber 38 forms a fluid chamber. Further, the pressure receiving chamber 38 communicates with the equilibrium chamber 30 through the orifice passage 40.
When an internal pressure change is caused in the pressure receiving chamber 38 at the time of vibration input, a fluid flow through the orifice passage 40 is generated between the pressure receiving chamber 38 and the equilibrium chamber 30, thereby causing the fluid to flow. A predetermined vibration damping effect is exerted on the basis of the resonance effect of the above. In the present embodiment, the length of the orifice passage 40 and the length of the orifice passage 40 are adjusted so that a high damping effect is obtained when a low-frequency, large-amplitude vibration such as a shake is input, based on the resonance action of the fluid flowing through the orifice passage 40. The cross-sectional area is tuned.

Further, a disk-shaped diaphragm 50 is vulcanized and bonded to the center of the first rubber elastic film 48. That is, the diaphragm 50 is connected to the first support fitting 44 and the second mounting fitting 12 via the first rubber elastic film 48.
The diaphragm 50 constitutes a part of the wall of the pressure receiving chamber 38.

A second support member 54 having a substantially annular plate shape is further superposed on the first support member 44 for supporting the vibration plate 50 in a fluid-tight manner in the axial direction and bolted. ing. Further, a disc-shaped second rubber elastic film 58 is provided in the central hole 56 of the second support fitting 54, and the outer peripheral edge thereof is vulcanized to the inner peripheral edge of the second support fitting 54. Glued. Thereby, the second support fitting 54
Is closed in a fluid-tight manner, so that a predetermined incompressible fluid is sealed and sealed between the first rubber elastic film 48 and the second rubber elastic film 58. Working chamber 6
0 is formed.

Further, a vibrating plate 62 having a disk shape smaller in diameter than the vibrating plate 50 is vulcanized and bonded to the central portion of the second rubber elastic film 58. That is, the vibration plate 62
Is connected to the second support fitting 5 via the second rubber elastic film 58.
4. Displaceably supported by the second mounting bracket 12, and by the vibrating plate 62 and the diaphragm 50,
Each of them constitutes a part of the wall of the working chamber 60.

Further, a bracket 64 is assembled to the second mounting bracket 12 by bolting it in a state of being superimposed on the second support bracket 54.
The bracket 64 allows the second mounting bracket 1 to be used.
2 is attached to the body side or the power unit side.

A yoke member 66 made of a ferromagnetic material such as iron is fixed to the bracket 64 by bolts, and is disposed behind the vibration plate 62 at a predetermined distance. This yoke member 66 is formed by connecting a circular block-shaped inner yoke part 68 located at the center and a cylindrical outer yoke part 70 surrounding the periphery thereof at one end in the axial direction. It has a structure. In addition, a mortar-shaped lightening hole 72 is provided at a central portion of the inner yoke portion 68 for weight reduction.

A cylindrical permanent magnet 74 having magnetic poles formed on both sides in the radial direction is fitted and fixed to the inner peripheral surface of the outer yoke portion 70 of the yoke member 66. That is, by the yoke member 66 and the permanent magnet 74,
A magnetic path having a magnetic gap between the inner peripheral surface of the permanent magnet 74 and the outer peripheral surface of the inner yoke 68 is formed in a closed magnetic circuit configuration.

In the magnetic gap formed between the opposing surfaces of the permanent magnet 74 and the inner yoke 68, a coil 76 can move in the gap in the axial direction (vertical direction in the figure). It is arranged. Further, a bobbin 78 of the coil 76 extends outward in the axial direction from the gap portion, and is fixed to the vibration plate 62 with a bolt. Thus, the coil 76 is fixedly connected to the vibration plate 62 and is displaced integrally, so that the electromagnetic force generated by energizing the coil 76 is exerted on the vibration plate 62. Has become.

As is clear from this, in this embodiment, the electromagnetic driving means is constituted by including the permanent magnet 74, the yoke member 66 and the coil 76. Also,
The magnetic flux density in the magnetic gap, and hence the coil 76
The bracket 64 is desirably formed of a non-magnetic material such as aluminum in order to effectively obtain an electromagnetic force generated by energization of the bracket 64.

In the engine mount having the above-described structure, an alternating current is applied to the coil 76 to change the electromagnetic force applied to the vibration plate 62 via the coil 76, thereby displacing the vibration plate 62 ( By vibrating), the displacement is exerted on the diaphragm 50 via the action chamber 60, and the diaphragm 50 is driven in a direction in which the internal pressure of the pressure receiving chamber 38 is changed (vertical direction in the drawing). It is.

Therefore, the energization of the coil 76 is controlled in accordance with the operating state of the power unit, the state of vibration transmission to the vehicle body, and the like, and the internal pressure of the pressure receiving chamber 38 is controlled by exciting the diaphragm 50. Therefore, the anti-vibration characteristics of the mount can be appropriately changed according to the vibration to be anti-vibrated. Specifically, for example, when a low-frequency large-amplitude vibration is input, the diaphragm 5
0 is vibrated in the same phase as the input vibration to positively generate the internal pressure of the pressure receiving chamber 38 and increase the amount of fluid that is allowed to flow through the orifice passage 40, thereby obtaining more excellent high damping characteristics. Can be done, and
When a small amplitude vibration in the middle to high frequency range is input, the diaphragm 5
By vibrating 0 in the opposite phase to the input vibration to absorb or reduce the internal pressure of the pressure receiving chamber 38, excellent vibration isolation characteristics can be obtained.

In this case, in particular, in such an engine mount, the vibration plate 62 functioning as the input side piston in the working chamber 60 is smaller in diameter than the vibration plate 50 functioning as the output side piston. Since the effective piston area on the input side is set smaller than the effective piston area, when the vibration plate 62 is displaced in the axial direction, the effective piston area on the input side is generated by the action chamber 60. The driving force is amplified by an amount corresponding to the enlargement ratio of the effective piston area on the output side with respect to (the ratio substantially corresponds to the ratio of the area of the diaphragm 50 to the area of the vibrating plate 62), and It will be transmitted.

Therefore, in such an engine mount, the electromagnetic force generated by the electromagnetic driving means including the permanent magnet 74, the yoke member 66 and the coil 76 is amplified by the working chamber 60, and the vibration plate 50
As a result, the vibration plate 50 can be vibrated with a sufficiently large driving force, and therefore, combined with the advantages of the electromagnetic driving means such as excellent response speed and easy control. Thus, effective hydraulic control of the pressure receiving chamber 38 becomes possible, and the intended mount anti-vibration characteristics can be advantageously and stably exhibited.

Further, in such an engine mount, the driving force of the diaphragm 50 is advantageously obtained by the amplifying action of the working chamber 60, so that the driving force required for the electromagnetic drive means is reduced, and therefore, The number of windings and the amount of current of the coil 76 can be reduced, heat generation during energization can be suppressed, the durability of the rubber material can be improved, and the weight of the permanent magnet 74 can be advantageously reduced by downsizing. There is also an advantage that it can be achieved.

Although the embodiment of the present invention has been described in detail, this is a literal example, and the present invention is not construed as being limited to such a specific example.

For example, in the above-described embodiment, the electromagnetic driving means uses an electromagnetic force. However, it is also possible to employ a type that directly uses the magnetic force of an electromagnet.

The relative ratio between the area of the vibration plate and the area of the vibration plate is:
It should be determined appropriately according to the characteristics of the electromagnetic driving means to be used, the anti-vibration characteristics required for the mounting device, and the like, and is not limited.

Further, in the above-described embodiment, the diaphragm 50 and the vibrating plate 62 are provided with the first and second rubber elastic films 48 and 5.
Although the support member 8 is displaceably supported by the second mounting member 12, a metal bellows, a leaf spring, or the like may be used instead of such a rubber elastic film.

Further, in the above embodiment, the equilibrium chamber 3 communicated with the pressure receiving chamber 38 through the orifice passage 40.
Although 0 is provided, the orifice passage 40 and the equilibrium chamber 30 are not necessarily provided.

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.
The present invention can be similarly applied to a body mount for a vehicle, a differential mount, or an anti-vibration device in various devices other than a vehicle, and furthermore, is disposed at a predetermined distance in a radial direction. The present invention is also advantageously applied to a cylindrical fluid-filled mounting device in which the inner cylinder and the outer cylinder are connected by a rubber elastic body and a fluid chamber is formed between the inner and outer cylinders. Can be 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.

[0038]

As is clear from the above description, in the fluid-filled mounting device having the structure according to the present invention, the driving force of the electromagnetic driving means is exerted on the diaphragm via the working chamber. Since it is amplified, even if the output of the electromagnetic driving means is small, the exciting force of the diaphragm can be advantageously secured, and an effective change in the internal pressure is generated in the fluid chamber. The switching control of the mount anti-vibration characteristic by the internal pressure control can be effectively performed, and the intended anti-vibration characteristic can be advantageously exhibited.

Moreover, in such a fluid-filled mounting device, the driving force required for the electromagnetic driving means is reduced by the effect of amplifying the driving force by the working chamber.
This makes it possible to reduce the amount of current supplied to the electromagnetic driving means, reduce the size of the permanent magnet, and the like, thereby advantageously improving durability and reducing weight by reducing the amount of heat generated.

[Brief description of the drawings]

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

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 First mounting bracket 12 Second mounting bracket 14 Rubber elastic body 30 Equilibrium chamber 38 Pressure receiving chamber 40 Orifice passage 48 First rubber elastic film 50 Vibration plate 58 Second rubber elastic film 60 Working chamber 62 Vibration plate 64 Bracket 66 yoke member 74 permanent magnet 76 coil 78 bobbin

Claims (1)

(57) [Claims] 1. A method according to claim 1, wherein the first mounting member and the second mounting member are connected by a rubber elastic body interposed therebetween.
A fluid chamber in which a predetermined incompressible fluid is sealed is provided by forming a part of the wall with such a rubber elastic body, and another part of the wall of the fluid chamber is provided with the second part. A fluid-filled mounting device comprising a diaphragm supported so as to be displaceable with respect to the mounting bracket, and provided with electromagnetic driving means for vibrating the diaphragm. A vibration plate having an area smaller than that of the plate is disposed so as to be displaceably supported by the second mounting bracket, and a predetermined incompressible fluid is sealed between the vibration plate and the vibration plate. While forming the chamber, by attaching the output shaft of the electromagnetic drive means to such a vibration plate,
A fluid-filled mounting device, wherein the driving force of the electromagnetic driving means is exerted on the diaphragm through the working chamber.