JP2657550B2 - Fluid-filled mounting device - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a fluid-filled mounting device, and more particularly to a fluid-filled mounting device capable of controlling switching of vibration damping characteristics such as a dynamic spring constant and a damping coefficient, and is suitably used as an engine mount for an automobile. And a fluid-filled mounting device.

(Background Art) Conventionally, as a type of a mounting device that is interposed between members constituting a vibration transmission system, and connects these members with anti-vibration or allows one of the members to support the other with anti-vibration. There is known a structure in which a first support and a second support arranged at a predetermined distance in a vibration input direction are connected by a rubber elastic body interposed therebetween. And is suitably used as an engine mount for automobiles and the like.

In recent years, Japanese Patent Application Laid-Open Nos. Sho 55-107142 and 57
In such a mounting device, a partition member supported by the second support and extending in a direction substantially perpendicular to the vibration input direction is disposed inside such a mounting device. A pressure receiving chamber to which vibration is input is formed on the first support body side, and a variable-capacity equilibrium chamber at least partially defined by a flexible film is formed on the opposite side to the pressure receiving chamber. And
There are various types of so-called fluid-filled mounting devices that have a structure in which a predetermined incompressible fluid is sealed in the pressure receiving chamber and the flat chamber and an orifice passage is provided for communicating the pressure receiving chamber and the flat chamber with each other. It has been proposed.

By the way, in such a mounting apparatus, when a plurality of different vibrations are input, different vibration-proof characteristics may be required in accordance with the input vibration in order to effectively prevent each of the vibrations. is there. For example, in an engine mount that constitutes a support mechanism for an engine in an automobile,
As its anti-vibration characteristics, 15-
For idling vibrations of about 30 Hz, low dynamic spring characteristics are required to improve vibration insulation, while for engine shakes of about 10 to 30 Hz input under vehicle running conditions, the engine unit In order to improve the vibration damping performance by suppressing the rocking, a high dynamic spring or a high damping characteristic is required.

However, as described above, in the conventional mounting device, the vibration isolating characteristics are fixedly set based on the elasticity of the rubber elastic body or the form of the orifice passage. It was extremely difficult to change the anti-vibration characteristics of the mound according to the input vibration, and thus the required anti-vibration characteristics could not always be sufficiently satisfied.

(Problem to be Solved) Here, the present invention has been made in view of the above-described circumstances, and a problem to be solved is that switching control of the mount anti-vibration characteristics is possible, and the control according to the input vibration is performed. It is another object of the present invention to provide a fluid-filled mounting device capable of obtaining mounting characteristics capable of exhibiting an excellent vibration effect.

(Solution) In order to solve such a problem, in the present invention, a first support and a second support, which are arranged at a predetermined distance in a vibration input direction, are placed between them. Vibrations to be damped, in which a predetermined incompressible fluid is sealed between the first support and the second support, respectively, while being connected by a rubber elastic body interposed Pressure receiving chamber,
A fluid-filled mounting device comprising a variable-capacity balance chamber defined at least in part by a flexible membrane, and an orifice passage interconnecting the pressure receiving chamber and the balance chamber. In the rubber elastic body, at least a part of the wall portion is formed at a flexible portion exposed to the pressure receiving chamber of the rubber elastic body and subjected to the liquid pressure, and has a predetermined volume. With a closed air chamber,
An air pressure means for supplying and sucking air to the air chamber is provided, and a switching means for switching and controlling the supply and suction of air to the air chamber by the air pressure means is provided.

(Operation / Effect) That is, in the fluid-filled mounting device having the structure according to the present invention, when the pressure in the air chamber is substantially equal to the atmospheric pressure, the flexibility of forming the air chamber is low. Since the wall portion is deformed in accordance with the change in the liquid pressure in the pressure receiving chamber, the change in the liquid pressure in the pressure receiving chamber can be absorbed and reduced. The low dynamic spring characteristic based on the elasticity of the rubber elastic body can be exhibited. On the other hand, when a negative pressure is applied to the air chamber, the flexible wall portion is sucked, and the flexible wall portion is sucked. The deformation according to the change in the fluid pressure in the pressure receiving chamber is prevented, so that the fluid pressure fluctuation in the pressure receiving chamber is effectively caused and the fluid flows through the orifice passage. Pressure and orifice passage The high dynamic spring characteristic and the high damping characteristic can be advantageously exhibited based on the resonance action of the fluid caused to flow inside.

Therefore, in such a fluid-filled mounting device, supply of air to the air chamber by pneumatic means,
By controlling the suction, the dynamic spring constant and the damping coefficient can be appropriately switched, so that the mount anti-vibration performance can be switched according to the anti-vibration characteristics required for the input vibration. Excellent anti-vibration performance can be advantageously exhibited in a wide range of situations.

(Example) Hereinafter, in order to clarify the present invention more specifically, an example of the present invention will be described in detail with reference to the drawings.

First, FIGS. 1 and 2 show a specific example of an automobile engine mount having a structure according to the present invention. In this figure, reference numerals 10 and 12 denote first and second support members as first and second support members, respectively, which are separated by a predetermined distance in one vibration input direction (vertical direction in FIG. 1). It is arranged.

Specifically, the first support fitting 10 is formed in a substantially thick bottomed cylindrical shape in which a central hole 14 extending in the axial direction is provided, and the first support fitting 10 has the central hole 14.
A stopper rubber 15 which has a substantially annular plate shape and has an outer peripheral edge protruding at a predetermined height toward the axial side where the first support fitting 10 is located at an outer peripheral edge thereof is integrally formed at an axial end of the opening. Is provided fixedly.

In addition, the second support fitting 12 has a stepped portion 16 at the center in the axial direction.
Is formed in a substantially stepped cylindrical shape comprising a small diameter portion 18 and a large diameter portion 20, and a caulked portion 22 is formed at an opening end on the small diameter portion 18 side, and an opening on the large diameter portion 20 side. A caulking portion 24 is provided at each end.

Then, the first support fitting 10 and the second support fitting 12
As shown in the figure, the closed side end of the first support fitting 10 is inserted into the second support fitting 12 from the large-diameter portion 20 side into a predetermined dimension in the axial direction. Are arranged concentrically at a predetermined distance from each other, and in such a state, the first support member 10 and the second support member 12 are elastically They are linked together and integrated.

Here, the rubber elastic body 26 is formed to have a substantially truncated conical shape as a whole, and the first support fitting 10 is embedded on the axial center from the small diameter side at the radial center thereof. While being vulcanized and bonded to the outer peripheral surface of the first support bracket 10, a substantially cylindrical mounting bracket 28 is provided on the outer peripheral surface thereof, and is attached to the inner peripheral surface of the mounting bracket 28. It is vulcanized and adhered. In short, the rubber elastic body 26 includes the first support fitting 10 and the mounting fitting.
It is formed as an integral vulcanized molded product which is vulcanized and bonded to 28.

Further, the rubber elastic body 26 has a predetermined thickness and spreads in a direction perpendicular to the axis at a portion opposed in one direction in the radial direction with the first support fitting 10 interposed therebetween.
A pocket portion 30 opening on the outer peripheral surface is formed through a window portion 32 provided in the main body. And the pocket part 3
According to 0 and 30, the large-diameter side portion of the rubber elastic body at the portion where they are formed is thinned, and the flexible elastic portions 42 and 42 are formed.

Furthermore, in these pocket portions 30, 30, rubber elastic members 26 formed in the facing direction thereof are respectively provided.
While communicating with the central hole 14 of the first support fitting 10 by communication holes 34, 34 extending through the cylindrical wall portion of the first support fitting 10, while in the central hole 14, A rotary valve 38 provided with a connection flow path 36 connecting the communication holes 34, 34 is accommodated and arranged. By rotating the rotary valve 38 with a rotary solenoid 40, the pocket 3
The communication inside / outside of 0 and 30 is controlled. In the drawing, reference numeral 46 denotes a seal ring.

In such an integrally vulcanized molded product, the mounting bracket 28 is fitted into the large-diameter portion 20 of the second support bracket 12, and both axial ends thereof are referred to as the stepped portion 16. Stiffening part 24
Between the second support fitting 12
The first support fitting 10 and the second support fitting 12 are integrally and elastically connected to each other by the rubber elastic body 26. -ing

Further, in such an integrally vulcanized molded product, the pocket portions 30, 30 are assembled by assembling with the second support fitting 12.
The openings of the windows 32, 32 of the mounting bracket 28, which are openings, are closed and sealed, so that the pockets 30, 30 can communicate with each other through the communication holes 34, 34, respectively. Air chambers 41, 41 of a predetermined volume that are sealed
Are formed.

Further, in these air chambers 41, 41, the inside of one of the air chambers 41 is connected to a negative pressure source 45 as pneumatic means through an air pressure line 43, and the air pressure line 43 According to the operation of the switching valve 47 as the switching means disposed above, the negative pressure source 45 and the atmosphere are selectively connected. The negative pressure or the atmospheric pressure applied to one of the air chambers 41 is also applied to the other air chamber 41 through the communication holes 34.

Further, in each of the air chambers 41, 41, a stopper member 49 having a substantially thick plate shape is accommodated,
In a state where it is located at a predetermined gap from the inner peripheral surface of the pocket portion 30 constituting the air chamber 41, the airbag 41 is fixedly attached to the second support fitting 12 with bolts or the like (not shown). Has been established. Incidentally, these stopper members 49, 49 are inserted into the pocket portions 30, 30 when assembling the integrally vulcanized molded product to the second support fitting 12,
After such assembling, it is assembled by being fixed to the second support fitting 12 with bolts or the like. The material of the stopper member 49 is not particularly limited as long as the material does not have large compressibility or flexibility. For example, various materials such as metal, synthetic resin, and rubber elastic body are used. Can also be suitably used.

On the other hand, a diaphragm 44 as a flexible film made of a thin rubber film is disposed at an opening portion of the second support fitting 12 on the small diameter portion 18 side, and is vulcanized and bonded to an outer peripheral edge thereof. The outer peripheral edge is clamped by the caulked portion 22 of the second support fitting 12 via the ring fitting 48, and the diaphragm 44 causes the small-diameter portion 18 of the second support fitting 12 to be clamped.
The side opening is closed.

Then, at the diaphragm 44, the second support fitting
The closed chamber is defined inside the second support fitting 12 by closing the opening on the small diameter portion 18 side of 12. In addition, on the outside of the diaphragm 44, a protection metal fitting 50 having a substantially shallow bottomed bottomed cylindrical shape has an outer peripheral edge,
It is arranged by being caulked and fixed together with the diaphragm 44 at the caulked portion 22 of the second support fitting 12.

Further, a predetermined incompressible fluid such as water, an alkylene glycol, a polyalkylene glycol, or a silicone oil is sealed in the closed chamber. The incompressible fluid can be sealed in the closed chamber by, for example, assembling the fitting 28 or the diaphragm 44 to the second support fitting 12 in such a fluid. Could be done.

Furthermore, in the closed chamber filled with the incompressible fluid, a partition member 52 having a substantially cylindrical shape with a bottom as a whole is provided.
The opening portion of the cylindrical wall portion is fixed together with the diaphragm 44 by the caulking portion 22 of the second support fitting 12, so that the bottom wall portion of the closed chamber is substantially perpendicular to the vibration input direction. It is arranged to partition in various directions. By the partition member 52, the closed chamber is located on the rubber elastic body 26 side, and the pressure receiving chamber 54 in which the internal pressure fluctuation is caused at the time of vibration input, and located on the diaphragm 44 side, the elastic deformation of the diaphragm 44 Balance room with variable volume at
56, divided into two fluid chambers.

Further, the partition member 52 has a substantially bottomed cylindrical shape, and is constituted by first and second partition fittings 58 and 60 which are superposed in the axial direction, and the first and second partition fittings are provided. There is a partition member between the superposed surfaces of 58 and 60
An orifice passage 62 that connects the pressure receiving chamber 54 and the flat impact chamber 56 to each other is formed in the cylindrical wall portion of the partition member 52, while the orifice passage 62 is located in the bottom wall portion of the partition member 52, and both partition fittings 58, An accommodating space 66 in which a thin disk-shaped movable plate 68, which is communicated with the pressure receiving chamber 54 and the striking chamber 56 through a plurality of communication holes 64 provided in the 60 and is accommodated and arranged to be displaceable by a predetermined distance, is provided. Are formed.

As is well known, by appropriately adjusting the flow path length and the flow cross-sectional area of the orifice passage 62 and the accommodation space 66 (communication hole 64), the inside of the orifice passage 62 can be caused to flow. Based on the resonance effect of the fluid, the high damping effect on the input vibration in the low frequency range of about 10 to 30 Hz corresponding to engine shake etc.
Based on the flow or resonance of the fluid caused to flow through the inside 64, a low dynamic spring effect against input vibration in a high frequency range of about 50 to 100 Hz, which causes booming noise, etc., can be exerted respectively. It is.

Thus, in the engine mount having the above-described structure, the first support member 10 is attached to the engine unit side of the vehicle, while the second support member 12 is attached to the vehicle body frame side. Therefore, it is interposed between them.

Then, under such an attached state, vibration will be input between the first support fitting 10 and the second support fitting 12,
As shown in FIG. 1, when the insides of the air chambers 41, 41 are opened to the atmosphere through pneumatic lines 43, they constitute one wall of the air chambers 41, 41 and receive pressure. With respect to the flexible walls 42, 42 which are also exposed to the chamber 54 and also constitute one wall of the pressure receiving chamber 54, a change in elasticity due to a change in the liquid pressure of the pressure receiving chamber 54 can be easily tolerated. Fluctuations in the hydraulic pressure in the pressure receiving chamber 54 at the time of vibration input are caused by those elastic wall portions 42,
It will be absorbed by the elastic deformation of 42.

Therefore, in such a state, the fluid pressure fluctuation does not effectively occur in the pressure receiving chamber 54, and the fluid flow through the orifice passage 62 is not effectively generated.
The rise of the dynamic spring due to the hydraulic pressure in the 54 or the orifice effect can be avoided, whereby the inherent low dynamic spring characteristics of the rubber elastic body 26 can be advantageously exhibited.

And on the other hand, in such an engine mount,
The switching valve 47 is switched, and the inside of the air chambers 41, 41 is a negative pressure source.
When it is connected to the stopper 45, the flexible walls 42, 42 are sucked by the negative pressure in the air chamber 41, respectively, as shown in FIG. By being brought into close contact, free deformation thereof is prevented.

Therefore, in such a state, the fluid flow through the orifice passage 62 and the communication hole 64 based on the fluid pressure fluctuation is advantageous because the fluid pressure fluctuation in the pressure receiving type 54 at the time of vibration input can be effectively generated. As described above, as described above, a high damping effect on low frequency vibration due to the resonance action of the fluid caused to flow in the orifice passage 62, and a high frequency effect due to the flow of the fluid caused to flow through the communication hole 64 or the resonance action The effect of the low dynamic spring against the vibration can be exhibited effectively.

Therefore, in the engine mount as described above, the switching control of the switching valve 47 in accordance with the traveling state of the vehicle or the like enables the switching control of the anti-vibration characteristic of the mount in accordance with the input vibration. Yes, thereby improving the riding comfort of the vehicle very advantageously can be achieved. More specifically, for example, when the vehicle is stopped, the inside of the air chambers 41, 41 is connected to the atmosphere, and when the vehicle is running, the inside of the air chambers 41, 41 is connected to a negative pressure source. By this, a sufficiently low dynamic spring characteristic can be exhibited with respect to an idling vibration of about 15 to 30 Hz input when the vehicle is stopped, and excellent vibration insulation can be realized. For the engine shake of about 10 to 30 Hz, the high damping characteristic is exhibited and excellent vibration damping performance can be realized, so that both the idling vibration and the engine shake can be suppressed. Excellent vibration isolation performance can be exhibited.

In particular, in the engine mount of the present embodiment, since the partition member 52 is provided with the hydraulic absorption mechanism including the movable plate 68, the air chambers 41, 41 are provided.
Even when the inside is connected to a negative pressure source, the communication hole 64
Based on the flow action of the fluid flowing through the inside, low dynamic spring characteristics can be exhibited for high-frequency vibrations such as muffled noises input when the vehicle travels, and a sufficient vibration-proof effect can be obtained.

Further, in the engine mount according to the present embodiment, the rotary valve 38 is rotated by the rotary solenoid 40 so that the communication holes communicating the air chambers 41 and 41 are formed.
Since the valve 34 can be shut off, the communication of the air chambers 41 and 41 by the rotary valve 38 is controlled,
Also, there is an advantage that the vibration damping characteristics in the direction perpendicular to the mount axis where the air chambers 41 and 41 face each other can be appropriately switched.

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

For example, in the engine mount in the above embodiment, a pair of air chambers 41, 41 was provided, but the number is not limited, and one or three or more air chambers may be formed. May be.

Further, in the above-described embodiment, the stopper member 49 is provided in the air chamber 41 in a state where the stopper member 49 is fixed to the second support fitting 12, but the stopper member 49 is not necessarily provided on the second support fitting 12. It is not necessary to fix them, and they can be arranged in a free state. Further, the stopper member 49 itself is not always necessary in the present invention, and any structure may be employed in which the free deformation of the flexible wall portion 42 can be prevented by the negative pressure applied to the air chamber 41. For example, the free deformation may be prevented by bringing the flexible wall portion into close contact with the air chamber surface located opposite thereto during negative pressure action.

Furthermore, in the above embodiment, the air chamber 41 is formed in the rubber elastic body 26, and the flexible wall portion 42 is formed in the rubber elastic body 26. It is also possible to form the elastic body 26 separately from the elastic body 26. By fitting the metal fitting on the inner peripheral surface of the second support metal fitting 12 and disposing the metal fitting in the pressure receiving chamber 54, an air chamber can be formed in the recess.

Furthermore, a rotary valve for controlling the communication / shutoff between the air chambers 41, 41
38 is not always necessary.

Further, in the engine mount in the above embodiment, a hydraulic pressure absorbing mechanism including the movable plate 68 is provided for the partition member 52, but such a hydraulic pressure absorbing mechanism is not necessarily required. Not something.

In addition, it goes without saying that the present invention can be advantageously applied to a differential mount, a body mount, or an anti-vibration device other than an automobile, in addition to the illustrated engine mount for an automobile.

In addition, although not enumerated one by one, the present invention can be carried out in an embodiment in which various changes, modifications, improvements, and the like are added based on the knowledge of those skilled in the art. It goes without saying that all of them are included in the scope of the present invention unless departing from the gist.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view showing one specific example in which the present invention is applied to an engine mount for an automobile, and FIG. 2 is a sectional view taken along the line II-II in FIG. FIG. 3 is a sectional view of a main part showing another operation state of the engine mount shown in FIG. 10: first support fitting, 12: second support fitting 26: rubber elastic body, 41: air chamber 42: flexible wall, 43: pneumatic pipeline 44: diaphragm, 45: negative pressure source 47: switching Valve, 52: Partition member 54: Pressure receiving chamber, 56: Balance chamber 62: Orifice passage

Claims (1)

(57) [Claims] A first support and a second support, which are arranged at a predetermined distance from each other in a vibration input direction, are connected by a rubber elastic body interposed therebetween. Between the first support and the second support, a pressure receiving chamber in which a predetermined incompressible fluid is sealed and vibration to be damped is input, and at least a part of the pressure receiving chamber is provided on the flexible membrane. A fluid-filled mounting device comprising a variable-capacity balance chamber defined by the above and an orifice passage communicating the pressure receiving chamber and the balance chamber with each other. And, at a flexible portion exposed to the pressure receiving chamber of the rubber elastic body and subjected to the liquid pressure, at least a part of a wall portion is formed, and has a sealed air chamber of a predetermined volume, Pneumatic means for supplying and sucking air to the air chamber is provided, A fluid-filled mounting device, further comprising switching means for switching between supply and suction of air to the air chamber by the pneumatic means.