JP3193170B2 - Liquid filled anti-vibration mount - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a liquid-filled anti-vibration mount in which an electrorheological fluid is filled, which is used for a mount of an automobile engine, for example.

[0002]

2. Description of the Related Art Heretofore, as this type of liquid-filled anti-vibration mount, one mounting member connected to the engine side, which is a vibration generation source, and a support cylinder are connected by an elastic support, and this elastic support is used. And an electrorheological liquid sealed between the other mounting member connected to the vehicle body supporting the engine.
It is known that two liquid chambers are formed, and a pair of electrodes for forming an electric field are provided in a communication hole communicating the two liquid chambers with a small gap therebetween. And JP-A-3-84241. In this device, the pair of electrodes is constituted by an annular electrode and a rod-shaped electrode having one end inserted in the main vibration input direction with the small gap therebetween in the annular electrode. The end is connected to the elastic bearing.

[0003]

However, in the conventional liquid-filled anti-vibration mount, since the rod-shaped electrode is connected to the elastic support, the rod-shaped electrode also moves with the displacement of the elastic support. Displace. That is, when the vibration in the main vibration input direction or the like is input to the elastic bearing member, the rod-shaped electrode also moves relative to the annular electrode in the main vibration input direction, and vibrates in a direction orthogonal to the main vibration input direction or in a so-called twisting direction. The rod-shaped electrode is moved relative to the annular electrode in the direction perpendicular to the ring electrode or in the twisting direction by inputting to the elastic support body. For this reason, when input is made to the elastic bearing body in a direction orthogonal to the main vibration input direction or in a twisting direction, the rod-shaped electrode may come into contact with the ring-shaped electrode and each electrode may be damaged. Moreover, when the two electrodes come into contact with each other, an excessive current flows between the two electrodes, so that not only a predetermined damping effect based on the viscosity of the electrorheological liquid cannot be obtained, but also energy loss occurs.

Further, when the rod-shaped electrode comes into contact with the ring-shaped electrode, relative movement of the elastic bearing in a direction perpendicular to the main vibration input direction or the like is prevented by the ring-shaped electrode. The resilience (spring constant) of the engine has been significantly increased, especially when applied to an engine mount for automobiles. Can not be done.

The present invention has been made in view of the above circumstances, and it is an object of the present invention to reliably avoid contact between a rod-shaped electrode and an annular electrode and to reduce rigidity in a main vibration input direction. An object of the present invention is to reduce rigidity in a direction orthogonal to the main vibration input direction while securing the same.

[0006]

In order to achieve the above object, according to the first aspect of the present invention, the rod-shaped electrode is not replaced by an elastic bearing which is displaced by an input vibration in a direction different from the main vibration input direction. It is connected to and supported by a second elastic bearing provided separately from the elastic bearing. That is, a cylindrical frame having one end connected to one of the vibration source and the vibration receiving portion, and a peripheral edge connected to the inner peripheral surface of the other end of the cylindrical frame to form the vibration source and the vibration receiving portion. And a liquid chamber defined inside the cylindrical frame and expanded and contracted by displacement of the elastic support. In addition, the liquid chamber is partitioned into a pressure receiving chamber on the elastic bearing body side and an equilibrium chamber on the other side, and a partition body having a communication hole communicating the pressure receiving chamber and the equilibrium chamber with each other, and a small gap is provided between the communication hole. And a pair of electrodes which are disposed so as to face each other and form an electric field in the small gap, and an electrorheological liquid which is sealed in the liquid chamber and whose viscosity changes by the electric field. In addition, it is assumed that the pair of electrodes includes an annular electrode provided on the inner peripheral surface of the communication hole and a rod-shaped electrode having one end inserted through the annular electrode. In this structure, the second elastic bearing body is separated from the elastic bearing body in the main vibration input direction and has a peripheral edge connected to the inner peripheral surface of the cylindrical frame so as to seal the space between the elastic bearing body and the elastic bearing body. And a liquid is sealed in a sealed space between the second elastic support and the elastic support to form a second liquid chamber independent of the liquid chamber. The other end of the rod-shaped electrode extends in the main vibration input direction and is supported by the second elastic support.

According to a second aspect of the present invention, in the first aspect of the present invention, the partition is provided with an elastic partition portion which is displaced in the main vibration input direction due to a fluctuation in the liquid pressure in the pressure receiving chamber. It is.

[0008]

According to the above-mentioned structure, according to the first aspect of the present invention,
Since the second elastic bearing is separated from the elastic bearing in the main vibration input direction, even if vibration or impact force in a direction different from the main vibration input direction is input to the elastic bearing, the second elastic bearing is used. The body is not displaced in the different directions. Therefore, the rod-shaped electrode supported by the second elastic bearing body is prevented from contacting the annular electrode, and the electro-rheological liquid is maintained at a predetermined viscosity by maintaining a predetermined electric field. On the other hand, since the second liquid chamber filled with the liquid is formed in the sealed space between the second elastic support and the elastic support, when vibration is input to the elastic support, the input is applied in any direction. The force is transmitted via the liquid in the second liquid chamber so as to displace the second elastic bearing in the main vibration input direction. Then, the pressure receiving chamber is expanded and contracted by the displacement of the second elastic bearing body in the main vibration input direction, and the flow of the electrorheological liquid occurs between the pressure receiving chamber and the equilibrium chamber through the communication hole. The vibration is attenuated by the liquid column resonance corresponding to the above. That is, while the elastic support and the second elastic support are involved in the input in the main vibration input direction, the elastic support is directly involved in the input in a direction different from the main vibration input direction. Since only the bearing is involved, the rigidity in the different direction is smaller than that in the main vibration input direction.

According to the second aspect of the invention, the fluctuation of the hydraulic pressure due to the expansion and contraction of the pressure receiving chamber is also absorbed by the displacement of the elastic partition of the partition in the main vibration input direction. For this reason, the effect of reducing the transmission rate of the vibration input to the elastic bearing body to the vibration receiving portion is not only in addition to the damping based on the viscosity of the electrorheological liquid through the communication hole according to the invention of claim 1, but also in the elastic partition. This is also performed by absorbing the above-mentioned fluid pressure fluctuation based on the spring constant of the section.

[0010]

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 shows a liquid-filled anti-vibration mount according to an embodiment of the present invention.
2 is a cup-shaped lower mounting member for closing the lower end opening side of the supporting cylinder 1, and 3 is an upper end opening side of the supporting cylinder 1. And the upper mounting member 4 disposed on the cylinder axis X is an annular main elastic bearing as an elastic bearing connecting the upper mounting member 3 and the supporting cylinder 1 to each other.
Is a diaphragm made of a rubber thin film, 6 is a partition member for partitioning between the diaphragm and the main elastic bearing member 4, 7 is a sub-elastic bearing member for shutting off between the partition member 6 and the main elastic bearing member 4, Reference numeral 8 denotes an annular electrode, and reference numeral 9 denotes a rod-shaped electrode that forms an electric field with the annular electrode 8.

The support cylinder 1 and the lower mounting member 2 are connected to each other by a caulking portion 1a formed by a lower edge portion of the support cylinder 1, and a cylindrical frame 10 is constituted by the two 1 and 2. ing. The lower mounting member 2 is fitted inside a bracket (not shown), and is connected to a vibration receiving portion, for example, a vehicle body side, by a connecting bolt 2a that is fixed to the lower mounting member 2 by protruding downward. ing. Note that a rubber thin film 1b is vulcanized and bonded to the inner peripheral surface of the caulked portion 1a, and the rubber thin film 1b seals the caulked portion 1a. The outer peripheral edge of the diaphragm 5 is fixed to the caulking portion 1a together with the outer peripheral edge of the lower mounting member 2, and is defined by the diaphragm 5, the support cylinder 1, and the auxiliary elastic support 7. In an enclosed space, an electric rheological liquid whose viscosity is changed by an electric field formed by the pair of electrodes 8 and 9 (Electric Rheological liquid).
Fluid) E is enclosed to form a first liquid chamber 11 as a liquid chamber.

The first liquid chamber 11 is provided with the partition 6
The pressure receiving chamber 12 is formed on the upper side of the partition body 6 and the equilibrium chamber 13 is formed on the lower side thereof. Further, a liquid L as an incompressible fluid is sealed in a closed space between the sub elastic support 7 and the main elastic support 4 to form a second liquid chamber 14.

The upper mounting member 3 includes a plate member 3a, a connecting bolt 3b projecting upward from the plate member 3a along the cylinder axis X, and a bottomed cylindrical member 3c projecting downward from the plate member 3a. It is composed of The mounting member 3 is connected to the vibration source side, for example, the engine side, via the connection bolt 3b. Further, the outer peripheral surface of the cylindrical member 3c and the supporting cylindrical body 1
The main elastic bearing 4 is formed in a truncated cone shape by integral vulcanization molding of rubber between the inner peripheral surface of the upper end opening edge 1c and the upper mounting member 3 by the main elastic bearing 4. The support cylinder 1 is elastically supported.

The partitioning body 6 is provided on the inner peripheral surface of the supporting cylindrical body 1 by, for example, press-fitting. The outer peripheral cylindrical portion 15, the inner peripheral cylindrical portion 16, and the direction orthogonal to the cylinder axis X direction (FIG. 1). Left and right directions; hereinafter, simply referred to as left and right directions).
5 and 16 are connected to each other by an integral vulcanization bonding of rubber. The doughnut-shaped elastic partition wall portion 17 penetrates vertically along the cylinder axis X by the inner peripheral cylinder portion 16 and the pressure receiving chamber 12 and A communication hole 18 that communicates with the balance chamber 13 is formed. The annular electrode 8 is provided on the inner peripheral surface of the communication hole 18.

The auxiliary elastic bearing member 7 has an outer peripheral cylindrical portion 19 attached to the inner peripheral surface of the support cylindrical body 1 by press-fitting, for example, on an outer peripheral edge portion. Is connected to the upper end portion 9a of the rod-shaped electrode 9 disposed along the line by integral vulcanization bonding of rubber to form a substantially truncated cone.
The auxiliary elastic bearing 7 is disposed so as to be vertically separated from the main elastic bearing 4 over the entire left and right direction of the support cylinder 1 in a state where the weight of the engine acts. I have. A lower end portion 9b of the rod-shaped electrode 9 is inserted into the annular electrode 8, and a pressure receiving chamber is provided between an inner peripheral surface of the annular electrode 8 and an outer peripheral surface of the lower end portion 9a of the rod-shaped electrode 9. A small gap 20 is formed at a predetermined interval that connects the chamber 12 and the equilibrium chamber 13.

The above-mentioned annular electrode 8 and rod-shaped electrode 9 are
1, and the intensity of the electric field formed in the small gap 20 can be changed by controlling the change of the applied voltage.

Next, the operation and effect of the embodiment having the above configuration will be described.

When vibration is input from the upper mounting member 3 in the vertical direction, the main elastic bearing 4 and the auxiliary elastic bearing 7 to which a force is transmitted via the liquid L sealed in the second liquid chamber 14 move up and down. Displaces by bending in the direction. That is, the elastic bearing force of both the main elastic bearing member 4 and the sub elastic bearing member 7 is exerted against the vertical vibration. Since the pressure receiving chamber 12 of the first liquid chamber 11 expands and contracts due to the displacement of the auxiliary elastic bearing member 7, the flow of the electrorheological liquid E occurs between the pressure receiving chamber 12 and the equilibrium chamber 13 through the small gap 20. . The vertical vibration can be attenuated by the liquid column resonance caused by the flow.

At this time, since the electrorheological liquid E is sealed in the first liquid chamber 11, it is possible to attenuate vibrations in a wide frequency range. That is, when the input vibration is a low-frequency side vibration, for example, an engine shake vibration,
By applying a predetermined voltage from the power source 21 to the rod-shaped electrode 9 and the annular electrode 8 to form an electric field having a predetermined strength in the small gap 20, the viscosity of the electrorheological liquid E when passing through the small gap 20 is increased. By increasing the resistance, the shear shear stress accompanying the vertical movement of the auxiliary elastic bearing 7 can be increased, and the damping of the engine shake vibration can be promoted.
When the input vibration is on the high-frequency side, the application of the voltage is stopped so that the auxiliary elastic support 7 is stopped.
Shearing stress caused by the vertical movement of the support member can be reduced, and the auxiliary elastic bearing member 7 can be easily moved, so that the input vibration can be hardly transmitted to the vibration receiving portion side.

Further, with the expansion and contraction of the pressure receiving chamber 12, the elastic partition 17 of the partition body 6 is bent in the vertical direction, and the pressure receiving chamber 1 is bent.
In order to absorb the fluctuation of the liquid pressure of the electrorheological liquid E in the elastic viscous liquid E, the reduction of the transmission rate of the input vibration to the vibration receiving portion is performed in addition to the attenuation based on the viscosity of the electrorheological liquid E,
It can also be performed by absorbing the above-mentioned fluid pressure fluctuation based on the spring constant of 7, and in particular, it can effectively attenuate and absorb low frequency vibrations such as the engine shake vibrations and impact forces.

On the other hand, when vibration or impact force is input from the upper mounting member 3 in the left-right direction or the twisting direction, the main elastic support 4 is displaced in the left-right direction or the like. When the second liquid chamber 14 is deformed due to the displacement in the left-right direction or the like, a force for vertically displacing the sub-elastic support body 7 through the liquid L acts on the sub-elastic support body 7. By displacing in the direction, the input vibration in the left-right direction and the like can be attenuated and absorbed as in the case of the vertical vibration input.

When a vibration is input to the upper mounting member 3 in the left-right direction or the like, the auxiliary elastic bearing 7 is isolated from the entire lower surface of the main elastic bearing 4 via the second liquid chamber 14. It is possible to reliably prevent the force for displacing the auxiliary elastic bearing body 7 from moving in the left-right direction or the like. As a result, it is possible to prevent the rod-shaped electrode 9 supported by the auxiliary elastic bearing member 7 from moving relative to the annular electrode 8 in the left-right direction, and it is possible to reliably prevent the contact between the two electrodes 8 and 9. . Thereby, a pair of electrodes 8,
9, the electric viscous liquid E can be reliably maintained in a predetermined viscous state by maintaining the electric field formation by the electric viscous liquid 9 in a predetermined state. It can be carried out.

In addition, the elastic support force of only the main elastic support 4 is exerted against the input of the above-mentioned lateral vibration and the like, and the auxiliary elastic support 7 is not involved. That is, since the rigidity in the left-right direction involves only the main elastic support 4 and the rigidity in the up-down direction involves both the main elastic support 4 and the sub-elastic support 7, the up-down direction, which is the main vibration input direction, The rigidity can be reduced in the other direction, the left-right direction, while ensuring sufficient rigidity.This makes it possible to reduce the muffled sound of vehicles in the mid-high speed range when this liquid-filled mount is applied to the engine mount. The suppression can be performed effectively.

It should be noted that the present invention is not limited to the above embodiment, but includes various other modifications. That is, in the above embodiment, the partition 6 is provided with the rubber elastic partition 17 so as to be vertically displaceable.
However, the present invention is not limited to this. For example, the partition body may be formed of synthetic resin or metal so as not to be displaced.

[0026]

As described above, according to the liquid-filled anti-vibration mount according to the first aspect of the present invention, the second elastic bearing is separated from the elastic bearing in the main vibration input direction. Even if vibration or impact force in a direction different from the main vibration input direction is input to the support, it is possible to reliably prevent the second elastic support from being displaced in the different direction. For this reason, it is possible to reliably prevent the rod-shaped electrode supported by the second elastic support from coming into contact with the annular electrode, and to maintain the predetermined viscosity of the electrorheological liquid by maintaining a predetermined electric field to maintain the electric viscosity. A predetermined vibration damping based on the viscosity of the viscous liquid can be exhibited. In addition, since the liquid is sealed in the closed space between the second elastic bearing and the elastic bearing, the elastic body and the sub-elastic bearing via the liquid resist input in the main vibration input direction. On the other hand, since the input from other directions different from the main vibration input direction is resisted only by the elastic bearings, the main vibration input direction can reduce the rigidity in other directions while securing sufficient rigidity. ,
As a result, it is possible to effectively suppress the muffled sound of the vehicle in a medium-to-high-speed rotation range when the liquid-filled mount is applied to an engine mount.

According to the second aspect of the invention, fluctuations in hydraulic pressure caused by expansion and contraction of the pressure receiving chamber are absorbed by displacement of the elastic partition wall of the partition in the main vibration input direction. The effect of reducing the transmission rate of the input vibration to the vibration receiving portion is based on the spring constant of the elastic partition portion in addition to the damping based on the viscosity of the electrorheological liquid through the communication hole according to the first aspect of the present invention. It can also be performed by absorbing hydraulic pressure fluctuations.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view showing an embodiment of the present invention.

[Explanation of symbols]

 Reference Signs List 4 main elastic bearing (elastic bearing) 6 partition 7 auxiliary elastic bearing (second elastic bearing) 8 annular electrode 9 rod-shaped electrode 9a upper end of rod-shaped electrode 9b lower end of rod-shaped electrode 10 cylindrical frame 11 first Liquid chamber (liquid chamber) 12 Pressure receiving chamber 13 Equilibrium chamber 14 Second liquid chamber 17 Elastic partition wall 18 Communication hole 20 Small gap

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Claims (2)

(57) [Claims] 1. A cylindrical frame having one end connected to one of a vibration source and a vibration receiving portion, and a peripheral edge connected to an inner peripheral surface at the other end of the cylindrical frame, the vibration source and An elastic bearing connected to the other of the vibration receiving portions; a liquid chamber defined inside the cylindrical frame and expanded and contracted by displacement of the elastic bearing; A partition body having a communication hole partitioning the pressure receiving chamber and the equilibrium chamber on the other side and communicating the pressure receiving chamber and the equilibrium chamber with each other, and a partition member disposed so as to face the communication hole with a small gap therebetween and having a small size; A pair of electrodes forming an electric field in the gap, and an electrorheological liquid sealed in the liquid chamber and having a viscosity changed by the electric field are provided, and the pair of electrodes are disposed on an inner peripheral surface of the communication hole. It comprises an annular electrode and a rod-shaped electrode having one end inserted through the annular electrode. In the liquid filled vibration isolating mount, the elastic bearing is separated from the elastic bearing in a main vibration input direction, and a peripheral edge is connected to an inner peripheral surface of the cylindrical frame so as to seal the space between the elastic bearing and the elastic bearing. A liquid is sealed in a sealed space between the second elastic bearing and the elastic bearing to form a second liquid chamber independent of the liquid chamber. The other end of the rod-shaped electrode extends in the main vibration input direction and is supported by the second elastic support. 2. The liquid-filled anti-vibration mount according to claim 1, wherein the partition body has an elastic partition portion displaced in the main vibration input direction due to a fluctuation of the liquid pressure in the pressure receiving chamber.