JPH07119789A - Fluid sealing type mount device - Google Patents

Abstract

PURPOSE:To provide a fluid sealing type mount device which can control the inner pressure of a fluid chamber effectively by using an electromagnetic driving means. CONSTITUTION:At the rear side of a diaphragm 50 to compose a part of the wall of a fluid chamber 38, an exciting plate 62 whose area is smaller than that of the diaphragm 50 is provided displaceable, and at the same time, an incompressible fluid is sealed between the diaphragm 50 and the exciting plate 62 so as to form an operation chamber 60, and the output shaft of an electromagnetic driving means is installed to the exciting plate 62. And the driving force of the electromagnetic means is amplified in the operation chamber, and the driving force is delivered to the diaphragm 50, so as to control the inner pressure of the fluid chamber 38.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a fluid-filled mount device used for an automobile engine mount or the like, and particularly to an electromagnetic drive means (which utilizes electromagnetic force, or directly uses magnetic force by an electromagnet to generate drive force). The present invention relates to a fluid-filled mount device in which the vibration damping characteristics can be switched from the outside by vibrating the wall portion of the fluid chamber by controlling the internal pressure of the fluid chamber.

[0002]

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

Further, in recent years, as one method for realizing a higher vibration damping characteristic, a fluid chamber in which a predetermined incompressible fluid is sealed is formed by a rubber elastic body in a part of the wall portion. And the other part of the wall portion of the fluid chamber is constituted by a displaceable vibrating plate, and the vibrating plate is vibrated by an actuator to A fluid-filled mount device has been proposed in which the vibration-proof characteristics are switched according to input vibration or the like by controlling the internal pressure.

By the way, in such a fluid-filled mount device, as an actuator for exerting a driving force on a diaphragm, a magnetic force or electromagnetic force by a solenoid or the like is used as disclosed in Japanese Utility Model Laid-Open No. 3-73741. The electromagnetic drive means can be easily operated and controlled by an electric signal such as voltage or current, and is thus preferably used.

However, in such an electromagnetic driving means, when the energizing current is increased, problems such as deterioration of durability of the rubber member due to heat generation and deterioration of magnet performance occur, and adoption of a large magnet causes an increase in mount weight. Therefore, it is difficult to obtain a sufficient driving force required for vibrating the diaphragm. Especially, when an input vibration load to the mounting device is large, such as an automobile engine mount. However, there is a problem that a desired internal pressure change of the fluid chamber is not produced, and it is practically difficult to obtain a sufficient switching effect of the vibration damping characteristics.

[0006]

The present invention has been made in view of the circumstances as described above, and the problem to be solved is that an increase in driving force by an electromagnetic drive means a large amount of heat generation or weight. The present invention provides a fluid-filled mount device that can be advantageously manufactured without increasing the number of components, thereby effectively changing the internal pressure of the fluid chamber, and stably obtaining a desired vibration-damping property. To do.

[0007]

In order to solve such a problem, a feature of the present invention resides in that a first mounting member and a second mounting member are mounted on a rubber elastic body interposed therebetween. And a fluid chamber in which a predetermined incompressible fluid is sealed is provided inside the wall portion by the rubber elastic body, while another fluid chamber wall portion is provided. In a fluid-filled mount device comprising an oscillating plate movably supported with respect to the second mounting member and electromagnetic driving means for exciting the oscillating plate. An oscillating plate having an area smaller than that of the oscillating plate is provided behind the oscillating plate so that the oscillating plate can be displaceably supported with respect to the second mounting member. While forming a working chamber in which the electromagnetic drive 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]

EXAMPLES Examples 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 having a structure according to the present invention. Such an engine mount is provided with a first mounting member 10 and a second mounting member 12 that are mounted on each of the power unit side and the body side, and these mounting members 10 and 12 have a predetermined distance from each other. The rubber elastic bodies 14 are arranged to face each other with a space therebetween, and are connected to each other by a rubber elastic body 14 interposed therebetween. In this engine mount, the rubber elastic body 14 is elastically deformed when the power unit load is applied between the first mounting member 10 and the second mounting member 12 under the condition that the engine mount is mounted on the vehicle. One mounting bracket 10 and second mounting bracket 12
Are positioned so as to be displaced from each other by a predetermined amount in the approaching direction, and main vibrations to be isolated are input in the substantially opposing direction of the first mounting member 10 and the second mounting member 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 and having outer flange portions 16 and 18 provided on the peripheral edge portions of the openings.
The outer flange portions 16 and 1 are overlapped with each other on the opening side.
It is configured by connecting the eight bolts. A mounting bolt 24 is erected on the bottom wall of the upper metal fitting 20 so as to project outward, and the first mounting metal fitting 10 is mounted on the power unit side or the body side by the mounting bolt 24. It is designed to be used.

A flexible film 26 having a substantially thin disk shape is formed in the void formed inside the first mounting member 10 at the outer peripheral edge of the upper and lower fittings 20, 22. It is arranged by being sandwiched between the flange portions 16 and 18, and the flexible film 26 allows such a space to be removed.
It is fluid-tightly divided into the 0 side and the lower metal fitting 22 side. The void on the upper metal fitting 20 side is an air chamber 28 that allows the deformation of the flexible film 26, while the void on the lower metal fitting 22 side is filled with a predetermined incompressible fluid. And 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 enclosed in the equilibrium chamber 30 is generally water or a low-viscosity fluid such as alkylene glycol, polyalkylene glycol or silicone oil in order to effectively obtain a vibration damping effect based on the resonance action of the fluid. Is preferably adopted.

Furthermore, on the bottom wall of the lower metal fitting 22, orifice metal fittings 32 and 34 each having a substantially disk shape are provided.
The inner and outer surfaces are overlapped with each other and fixed by bolts, and annular flow paths extending in the circumferential direction are formed between the overlapping surfaces of the orifice fittings 32 and 34 and the lower fitting 22. The annular flow paths communicate with each other through a through hole 36 provided in the bottom wall portion of the lower metal fitting 22, and thereby extend in a predetermined length in the circumferential direction, so that the equilibrium chamber 30 is 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 arranged substantially coaxially with the first mounting member 10 at a predetermined distance in the axial direction. .
A rubber elastic body 14 is interposed between the second mounting member 12 and the first mounting member 10, and the rubber elastic body 14 connects the two mounting members 10 and 12. .

The rubber elastic body 14 has a tapered, thick-walled 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 an opening on the small diameter side. While being fixed, the second mounting member 12 is fixed to the large diameter side opening. That is, this rubber elastic body 14
It is formed as an integrally vulcanized molded product having the lower metal fitting 22 and the second mounting metal fitting 12.

Further, a first support metal fitting 44 having a substantially annular plate shape is axially superposed on the second mounting metal fitting 12 via an annular spacer metal fitting 42 to form a second mounting metal fitting. It is bolted to 12 in a fluid-tight manner. Further, a disk-shaped first rubber elastic film 48 is disposed in the central hole 46 of the first support fitting 44, and the outer peripheral edge portion thereof is vulcanized to the inner peripheral edge portion of the first support fitting 44. It is glued. As a result, the central hole 46 of the first support fitting 44, and hence the opening of the second mounting fitting 12, is closed in a fluid-tight manner, so that a predetermined incompressibility is retained inside the rubber elastic body 14. A pressure receiving chamber 38 in which a fluid is enclosed is formed.

That is, in the pressure receiving chamber 38, when the vibration is input between the first mounting member 10 and the second mounting member 12, the internal pressure fluctuation is caused by the elastic deformation of the rubber elastic body 14. The pressure receiving chamber 38 constitutes a fluid chamber in the present embodiment, as is apparent from this. In addition, the pressure receiving chamber 38 passes through the orifice passage 40 and the balance chamber 30.
When an internal pressure fluctuation is induced 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, and A predetermined anti-vibration effect is exerted on the basis of the resonance action of. 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 can be exerted 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 etc. are tuned.

Further, a disk-shaped vibrating plate 50 is vulcanized and adhered to the central portion of the first rubber elastic film 48. That is, the vibration plate 50 includes the first support metal fitting 44 and the second mounting metal fitting 12 through the first rubber elastic film 48.
The vibrating plate 50 constitutes a part of a wall portion of the pressure receiving chamber 38.

Further, to the first support fitting 44 for supporting the vibration plate 50, a second support fitting 54 having a substantially annular plate shape is further fluid-tightly superposed in the axial direction and bolted. ing. Further, a disk-shaped second rubber elastic film 58 is disposed in the central hole 56 of the second support fitting 54, and the outer peripheral edge portion thereof is vulcanized to the inner peripheral edge portion of the second support fitting 54. It is glued. As a result, the second support fitting 54
The central hole 56 is fluid-tightly closed, so that the first rubber elastic film 48 and the second rubber elastic film 58 are hermetically sealed and a predetermined incompressible fluid is sealed inside. Working chamber 6
0 is formed.

Further, a vibrating plate 62 having a disk shape having a diameter smaller than that of the vibrating plate 50 is vulcanized and adhered to the central portion of the second rubber elastic film 58. That is, this vibrating plate 62
Through the second rubber elastic film 58, the second support fitting 5
4. Further, it is displaceably supported by the second mounting member 12, and by the vibrating plate 62 and the vibrating plate 50,
Each of them constitutes a part of the wall of the working chamber 60.

Further, the bracket 64 is assembled to the second mounting member 12 by being bolted to the second supporting member 54 in a state of being superposed on the second supporting member 54.
Then, with this bracket 64, the second mounting bracket 1
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 arranged behind the vibration plate 62 at a predetermined distance. The yoke member 66 is formed by connecting a circular block-shaped inner yoke portion 68 located in the center portion and a cylindrical outer yoke portion 70 positioned so as to surround the periphery at one end portion in the axial direction. It is considered as a structure. A mortar-shaped lightening hole 72 is provided in the 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,
The magnetic path having the magnetic gap portion between the inner peripheral surface of the permanent magnet 74 and the outer peripheral surface of the inner yoke portion 68 is formed in a closed magnetic circuit form.

Further, in the magnetic gap portion formed between the facing surfaces of the permanent magnet 74 and the inner yoke portion 68, the coil 76 is movable in the gap portion in the axial direction (vertical direction in the drawing). It is arranged. Further, the bobbin 78 of the coil 76 extends axially outward from the gap portion and is fixed to the vibrating plate 62 by bolts. As a result, the coil 76 is fixedly connected to the vibration plate 62 and can be displaced integrally, so that the electromagnetic force generated by the energization of the coil 76 is exerted on the vibration plate 62. Has become.

As is apparent from this, in this embodiment, the electromagnetic drive means is constituted by the permanent magnet 74, the yoke member 66 and the coil 76. Also,
Magnetic flux density in the magnetic gap portion, and eventually coil 76
It is desirable that the bracket 64 be formed of a non-magnetic material such as aluminum in order to effectively obtain an electromagnetic force generated by energizing the bracket.

In the engine mount having the above structure, an alternating current is passed through the coil 76 to change the electromagnetic force exerted on the vibrating plate 62 via the coil 76 to displace the vibrating plate 62 ( By vibrating), the displacement is exerted on the vibrating plate 50 via the action chamber 60, so that the vibrating plate 50 is driven in the direction (vertical direction in the drawing) that changes the internal pressure of the pressure receiving chamber 38. Of.

Therefore, the energization of the coil 76 is controlled according to the operating state of the power unit, the vibration transmission state to the vehicle body side, etc., and the diaphragm 50 is vibrated to control the internal pressure of the pressure receiving chamber 38. Therefore, the vibration damping characteristics of the mount can be appropriately changed according to the vibration to be vibration-proofed. 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 made to flow through the orifice passage 40, thereby obtaining a more excellent high damping characteristic. And you can also
When inputting small amplitude vibrations in the middle to high frequency range, the diaphragm 5
By vibrating 0 in a phase opposite to the input vibration to absorb or reduce the internal pressure of the pressure receiving chamber 38, an excellent vibration isolation characteristic can be obtained.

In particular, in such an engine mount, the vibrating plate 62 which functions as an input side piston in the working chamber 60 has a diameter smaller than that of the vibrating plate 50 which functions as an output side piston. Since the effective piston area on the input side is set smaller than the effective piston area, when the vibrating plate 62 is displaced in the axial direction, the working chamber 60 causes the effective piston area on the input side to move. The driving force is amplified by the expansion rate of the effective piston area on the output side (corresponding to the ratio of the area of the vibration plate 50 to the area of the vibration plate 62) from the vibration plate 62 to the vibration plate 50. It will be transmitted.

Therefore, in such an engine mount, the electromagnetic force generated by the electromagnetic driving means constituted by the permanent magnet 74, the yoke member 66 and the coil 76 is amplified by the working chamber 60 and the diaphragm 50.
Since it is exerted as a vibrating force on the diaphragm 50, the vibrating plate 50 can be vibrated with a sufficiently large driving force. Therefore, in combination with the advantages of the electromagnetic driving means such as excellent response speed and easy control. As a result, it becomes possible to effectively control the hydraulic pressure of the pressure receiving chamber 38, and the desired mount anti-vibration characteristic can be exhibited advantageously and stably.

Moreover, 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 driving means is reduced, and therefore, It is possible to reduce the number of windings of the coil 76 and the amount of energization, suppress heat generation during energization, improve the durability of the rubber material, and reduce the weight of the permanent magnet 74 due to downsizing. There is also an advantage that it can be achieved.

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-mentioned embodiment, the electromagnetic drive means uses the electromagnetic force, but it is also possible to adopt the type that directly utilizes the magnetic force of the electromagnet.

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

Furthermore, in the above embodiment, the vibrating plate 50 and the vibrating plate 62 are the same as the first and second rubber elastic films 48 and 5.
Although it was displaceably supported by the second mounting member 12 by means of 8, it is also possible to use a metal bellows, a leaf spring or the like instead of such a rubber elastic film.

Further, in the above-mentioned embodiment, the equilibrium chamber 3 communicating with the pressure receiving chamber 38 through the orifice passage 40.
Although 0 is provided, the orifice passage 40 and the equilibrium chamber 30 do not necessarily have to be provided.

Further, in the above embodiment, a specific example of the present invention applied to an automobile engine mount is shown.
The present invention is similarly applicable to a body mount and a differential mount for automobiles, or a vibration isolator in various devices other than automobiles. Further, the present invention is arranged at a predetermined distance in the radial direction. The present invention is also advantageous for a tubular fluid-filled mount device in which the inner tubular fitting and the outer tubular fitting are connected by a rubber elastic body and a fluid chamber is formed between the inner and outer tubular fittings. Can be applied.

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.

[0038]

As is apparent from the above description, in the fluid-filled mount device having the structure according to the present invention, the driving force by the electromagnetic drive means is exerted on the diaphragm through the working chamber, Because of the amplification, even if the output of the electromagnetic drive means is small, the vibration force of the diaphragm can be advantageously secured, and an effective internal pressure change can be generated in the fluid chamber. Therefore, the switching control of the mount anti-vibration characteristics by the internal pressure control can be effectively performed, and the desired anti-vibration characteristics can be advantageously exhibited.

Moreover, in such a fluid-filled mount device, the driving force required by the electromagnetic driving means is reduced by the effect of amplifying the driving force by the working chamber.
It is possible to reduce the amount of electricity supplied to the electromagnetic drive means and to reduce the size of the permanent magnet, and it is possible to advantageously improve durability and reduce weight by reducing the amount of heat generation.

[Brief description of drawings]

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

[Explanation of symbols]

 10 1st mounting metal fittings 12 2nd mounting metal fittings 14 Rubber elastic body 30 Equilibrium chamber 38 Pressure receiving chamber 40 Orifice passage 48 First rubber elastic film 50 Vibrating plate 58 Second rubber elastic film 60 Working chamber 62 Exciting plate 64 Bracket 66 Yoke member 74 Permanent magnet 76 Coil 78 Bobbin

Claims (1)

[Claims] 1. A first mounting member and a second mounting member are connected by a rubber elastic body interposed therebetween, and
A fluid chamber in which a predetermined incompressible fluid is enclosed is provided by constituting a part of the wall portion by such a rubber elastic body, while another part of the wall portion of the fluid chamber is set to the second portion. In the fluid-filled mount device, which comprises a vibrating plate that is displaceably supported with respect to the mounting bracket, and is provided with an electromagnetic drive means for vibrating the vibrating plate, the vibrating plate is provided behind the vibrating plate. A vibrating plate having an area smaller than that of the vibrating plate is disposed to support the second mounting bracket so as to be displaceable, and a predetermined incompressible fluid is enclosed between the vibrating plate and the vibrating plate. While forming the chamber, by attaching the output shaft of the electromagnetic drive means to the vibrating plate,
A fluid-filled mount device, wherein the driving force of the electromagnetic drive means is applied to the diaphragm through the working chamber.