JPH0533824A - Fluid enclosed mount - Google Patents

Abstract

PURPOSE:To provide a fluid enclosed mount capable of damping both vibration caused by large load and vibration caused by small load. CONSTITUTION:An elastic body 4 is installed over a supporting member 2 and connecting member 3, and a diaphragm 4 is arranged below the elastic body 4, and a fluid chamber 6 is formed between the elastic body 4 and the diaphragm 5. Ethylene glycol 8 of low viscosity and high specific gravity and silicon oil 9 of high viscosity and low specific gravity are filled in the fluid chamber 6. A moving plate 3a which moves in the fluid chamber 6 when a load works is connected to the connecting member 3 and is soaked in the silicon oil 9 while loads do not work. When a large load works, the load is damped by the high viscous silicon oil 9, and when a small load works and vibration is generated, the vibration is damped by the low viscous ethylene glycol 8.

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, and more particularly to a mount whose characteristics are variable depending on the magnitude of an input load.

[0002]

2. Description of the Related Art Conventionally, in a general automobile, an example of an anti-vibration mount for elastically supporting an engine on a vehicle body chassis while suppressing transmission of vibration generated by the engine to the vehicle body chassis side As Japanese Patent Laid-Open No. 1-2
There is one disclosed in Japanese Patent Publication No. 83446.
The anti-vibration mount disclosed in this publication has an elastic member provided between a support member attached to the chassis side of a vehicle body and a connecting member attached to the engine side, and is formed of a sealed space inside the elastic member. A fluid chamber is formed in advance, and a fluid such as oil is enclosed in the fluid chamber. Further, a damper plate is arranged in the fluid chamber to divide the fluid chamber into a plurality of small fluid chambers, and an opening having a small diameter is formed in the damper plate. With such a structure, when vibration occurs, the fluid in each small fluid chamber mutually flows through the opening of the damper plate as the fluid chamber is deformed, so that the vibration is damped by the flow resistance. ing.

[0003]

However, in the vibration proof mount thus constructed, the damping characteristic of vibration is specified by the viscosity of the fluid enclosed in the fluid chamber. That is, when the viscosity of the fluid enclosed in the fluid chamber is high,
Although the load damping characteristics when a large load is applied are excellent, it is not possible to effectively reduce the vibration transmission characteristics of low amplitude and high frequency due to a small load. On the contrary, when the viscosity of the fluid is low, the vibration transmission characteristics of low amplitude and high frequency are effectively reduced, but the damping characteristics are inferior to a large load. Therefore, a plurality of anti-vibration mounts are required to obtain both of these characteristics, which causes a problem that the support structure is complicated.

The present invention has been made in view of this point, and an object of the present invention is to provide a fluid-filled mount capable of damping both a large load and a small load.

[0005]

In order to achieve the above object, the present invention encloses a plurality of fluids having different viscosities in a fluid chamber so that when a large load is applied, the fluid having a high viscosity is loaded. When a small load acts to generate vibration, the fluid with low viscosity damps the vibration. Specifically, the invention according to claim 1 is provided with an elastic means that is laid across a connecting member that is attached to the vibrating portion and a support member that is attached to the vibration isolating portion, and a fluid is provided inside the elastic means. It is premised on a fluid-filled mount in which a fluid chamber to be enclosed is formed. Then, a moving plate that is immersed in the fluid in the fluid chamber and moves in the fluid chamber as the connecting member moves due to the action of an external load is coupled to the coupling member. Furthermore, in the fluid chamber,
A plurality of types of fluids having different viscosities and specific gravities and incompatible with each other are enclosed, and when the external load is large, the moving plate moves in the fluid of high viscosity and vibrates within the fluid of low viscosity. On the other hand, when the external load is small, the moving plate forms a vibrating portion inside the fluid having high viscosity.

According to a second aspect of the present invention, the elastic means is provided so as to extend over the connecting member attached to the vibrating portion and the supporting member attached to the vibration isolating portion, and the fluid is enclosed in the elastic means. It is premised on a fluid-filled mount in which a fluid chamber is formed. Then, in the fluid chamber,
A panel material that divides the fluid chamber into a plurality of small fluid chambers is provided, and an orifice hole that communicates the small fluid chambers is formed in the panel material. Further, a plurality of types of fluids having different viscosities and specific gravities and incompatible with each other are enclosed in the fluid chamber, and when the external load is large, the fluid with high viscosity passes through the orifice hole, while the external load is small. At times, a fluid having a low viscosity passes through the orifice hole.

According to a third aspect of the present invention, in the fluid-filled mount according to the second aspect, the panel material is arranged along the boundary of the fluid enclosed in the fluid chamber.

The invention according to claim 4 is the same as claim 1 or claim 2.
Alternatively, in the fluid-filled mount according to the third aspect, an elastic member is provided over the connecting member and the supporting member, and the elastic member is deformed by the movement of the connecting member due to the action of an external load. The diaphragm is arranged with a space between the diaphragm and the diaphragm, which is deformed as the volume of the fluid chamber changes with the movement of the connecting member.

[0009]

With the above-described structure, the present invention has the following effects. In the invention of claim 1, in particular,
It has a suitable function as an engine mount. When an external load acts on the connecting member, the connecting member moves with respect to the supporting member. And during acceleration when this external load is large,
In the case of impact input, the moving plate moves in a highly viscous fluid to damp this load. Then, while a load above a certain level is being applied, such as during acceleration, the moving plate forms an oscillating part inside the fluid with low viscosity, lowering the dynamic spring constant in the high-frequency region, and thereby accelerating. Time,
Improve the sound quality transmitted in the car. On the other hand, in the case of steady running in which the external load is small and high-frequency vibration is generated, the moving plate moves in a highly viscous fluid and a vibration acting portion is formed inside the moving plate. These vibrations with low target sound pressure level are attenuated. In this way, one mounting structure can provide damping action for both large and small loads.

According to the second aspect of the present invention, when the external load is large, the fluid having high viscosity passes through the orifice holes of the panel material to attenuate the load, and when the external load is small, the fluid having low viscosity is used. Pass through the orifice holes in the panel material to damp vibrations. Therefore, also in this case, it is possible to obtain a damping action for both large loads and small loads with one mounting structure. For example, in the case of an engine mount, a high-viscosity fluid flows through the orifice hole to achieve high damping when the low-frequency large-amplitude is generated when driving on a rough road, and when the high-frequency micro-amplitude is generated during steady-state driving, the orifice hole is A fluid with low viscosity flows and low dynamic spring characteristics can be achieved.

According to the third aspect of the invention, since the panel material is arranged along the boundary of the fluid, the damping characteristic can be changed according to the input direction of the load.

In the invention described in claim 4, when an external load is applied, the elastic body is deformed as the connecting member moves,
Moreover, the diaphragm is deformed in accordance with the change in the capacity of the fluid chamber, so that the fluid flows smoothly and the damping operation is efficiently performed.

[0013]

【Example】

(First Embodiment) Next, a first embodiment of the present invention will be described with reference to FIG.
And it demonstrates based on FIG. FIG. 1 is a vertical sectional view of a fluid-filled mount 1 according to this example. The liquid-filled mount 1 is interposed between a chassis of an automobile (not shown) and an engine, and is arranged for the purpose of damping the vibration generated by the engine and preventing the vibration from being transmitted to the chassis side and further to the vehicle interior. It is set up.

The liquid-filled mount 1 is provided with a support member 2 connected to the chassis side and a connection member 3 connected to the engine side, and an elastic body 4 is installed between the two. Made up of.

The support member 2 includes a cylindrical body 2a and a bottom plate 2b.
The tubular body 2a is formed with a locking portion 2c having a substantially U-shaped vertical section at its lower end. Also, the bottom plate 2b
Is provided with a flange portion 2d formed by outwardly bending the outer peripheral edge portion thereof slightly upward, and the flange portion 2d is locked to the locking portion 2c of the tubular body 2a. ing. A bolt B1 is welded to the center of the bottom plate 2b, and a male screw part of the bolt B1 extends downward from the lower surface of the bottom plate 2b so that the support member 2 is fastened to the chassis by the bolt B1. It has become.

On the other hand, the connecting member 3 is made of metal and has an inverted truncated cone shape, and the male screw portion of the bolt B2 embedded in the connecting member 3 is projected from the upper surface thereof. The connecting member 3 is fastened to the engine by B2.

The elastic body 4 made of rubber is provided by vulcanization adhesion between the inner peripheral surface around the upper end of the cylindrical body 2a and the outer peripheral surface of the connecting member 3. Further, a diaphragm 5 is arranged at an upper position facing the bottom plate 2b. The diaphragm 5 is made of a rubber film member, and the outer peripheral edge portion 5a thereof is superposed on the upper surface of the flange portion 2d of the bottom plate 2b.
It is locked to the locking portion 2c of a. In this way, the elastic member 4 and the diaphragm 5 constitute the elastic means in the present invention. Further, on the upper side and the lower side of the diaphragm 5, a fluid chamber 6 composed of an independent closed space is provided.
And an air chamber 7 is formed. A fluid, which will be described later, is enclosed in the fluid chamber 6 which is the upper closed space, and the air chamber 7, which is the lower closed space, is communicated with the outside air.

Next, the fluid enclosed in the fluid chamber 6 which is a feature of this embodiment will be described. In the fluid chamber 6, two kinds of fluids 8 and 9 having different specific gravities and viscosities and incompatible with each other are enclosed. That is, the lower part of the fluid chamber 6 is filled with ethylene glycol 8 having a large specific gravity and a small viscosity, while the upper part of the fluid chamber 6 has a specific gravity larger than that of the ethylene glycol 8. Silicon oil 9 having a small size and a large viscosity is enclosed. In this way, since the two fluids 8 and 9 having different specific gravities are enclosed in the fluid chamber 6, the respective fluids 8 and 9 are enclosed in the fluid chamber 6 in a two-layer structure of upper and lower layers.

Another feature of the present embodiment is a moving plate 3a attached to the connecting member 3. The moving plate 3a is connected to the lower surface of the connecting member 3 via a connecting rod 3b.
The moving plate 3a has a central portion extending in a substantially horizontal direction, and an outer peripheral edge portion curved slightly downward to form a substantially inverted bowl shape. Further, the outer peripheral edge portion of the lower end portion of the moving plate 3a is set at such a position as to have a small gap S with the cylindrical body 2a of the support member 2. As a result, the fluid chamber 6 is moved by the moving plate 3a so that the upper region 6a and the lower region 6 function as small fluid chambers in the present invention.
It is divided into b and. Also, the moving plate 3a
Is immersed in a layer of silicone oil 9 in the fluid chamber 6 when the engine is mounted and connected and the load is not applied to the connecting member 3.

Next, the operation of the fluid-filled mount 1 configured as described above will be described. First, when a large load is applied to the connecting member 3 due to input of an external load such as running on a rough road, accelerating, or suddenly stopping, the moving plate 3a
Will move in the layer of silicone oil 9 having high viscosity. At this time, the moving plane that moves due to this large load
Since a large flow resistance acts on the gate 3a, this large load is attenuated and the displacement amount due to the load is reduced. That is, a large damping force can be exerted against vibration (movement) in a large amplitude and low frequency range, and the influence of this load is not given to the chassis and thus to the vehicle interior.

On the other hand, when a small load of the high frequency vibration component is always applied to the connecting member 3 at the time when a load of a certain level or more is applied during acceleration of the vehicle, as shown in FIG. In addition, the elastic body 4 is deformed as the connecting member 3 moves downward, and the diaphragm 5 bends downward. As a result, the transfer plate 3a moves from the inside of the silicone oil 9 layer into the inside of the ethylene glycol 8 layer,
Stop in that layer. And this ethylene glycol 8
In this state, the flow resistance during the movement of the moving plate 3a is small because the viscosity is low. That is, when the dynamic rigidity is low and vibration is generated in this state, the ethylene glycol 8 flows between the upper region 6a and the lower region 6b of the fluid chamber 6 through the small gap S. Therefore, the vibration is damped by the flow resistance due to this flow. That is, it is possible to reduce the vibration transmission characteristic with respect to the vibration in the small amplitude and high frequency range, suppress the transmission of this vibration into the vehicle interior, and improve the engine sound quality.

Thus, the fluid-filled mount 1 of this embodiment
In this case, when a large load is applied to the connecting member 3, the load can be attenuated by the silicone oil 9 having a high viscosity, and when vibration due to a small load due to a high frequency component is generated, the viscosity of the viscosity can be reduced during steady running. Since the vibration can be damped by the high silicone oil 9 and the ethylene glycol 8 which has a low viscosity at the time of acceleration, it is possible to obtain both a large load damping and a high frequency vibration damping with one member.

(Second Embodiment) Next, a second embodiment of the present invention will be described with reference to FIGS. Further, since the basic structure of the fluid-filled mount 1 of this example is substantially the same as that of the above-described first example, detailed description thereof will be omitted, and only the configuration of a characteristic part will be described. .

The characteristic feature of the fluid-filled mount 1 of the present embodiment is that it is a movable pre-mounter according to the first embodiment.
The orifice panel 10 is provided at an upper position opposed to the diaphragm 5 instead of having the valve 3a. The orifice panel 10 is provided with a flange portion 10a formed by bending the outer peripheral edge portion thereof slightly downward and then outwardly bent. The flange portion 10a serves as a locking portion 2c of the tubular body 2a. It is locked. Further, an opening 10b as an orifice hole in the present invention, through which the fluids 8 and 9 flow, is formed in the central portion of the orifice panel 10. The orifice panel 10 is immersed in the layer of ethylene glycol 8.

The operation of this embodiment will be described. First, when a large load is applied to the connecting member 3,
As shown in FIG. 4, the deformation of the elastic body 4 causes the ethylene glycol 8 to flow through the opening 10b of the orifice panel 10, and subsequently the silicone oil 9 flows through the opening 10b. At this time, since the flow resistance rapidly increases, the large load is attenuated by this, and the displacement amount due to the load is reduced.

On the other hand, when vibration is caused by the action of a small load, the opening 10b of the orifice panel 10 is formed.
Since the ethylene glycol 8 having a low viscosity flows in, the vibration is damped by the flow resistance due to this flow.

As described above, the fluid-filled mount 1 of this embodiment
Even in the case, when a large load acts on the connecting member 3 as in the case of the first embodiment described above, the load can be attenuated by the silicone oil 9 having high viscosity, and when the small load causes vibration. Since the vibration can be damped by the ethylene glycol 8 having a low viscosity, it is possible to obtain both a large load damping and a high frequency vibration damping with one member.

(Modification) Next, a modification of the second embodiment will be described with reference to FIG. Fluid-filled mount 1 of this example
The orifice panel 10 is characterized in that
It is located at the position. That is, the orifice panel 10 is
Boundary A between the ethylene glycol layer and the silicone oil layer
The position is set so as to follow. That is, the orifice panel 10 has the upper surface facing the silicone oil layer and the lower surface facing the ethylene glycol layer. For this reason,
When a load is applied from above, the silicone oil 9 flows through the opening 10b of the orifice panel 10 as the connecting member 3 moves and the elastic body 4 deforms. On the other hand, when a load from below is applied, the ethylene glycol 8 flows through the opening 10b of the orifice panel 10. Therefore, the damping characteristics can be changed according to the input direction of the load.

In each of the above-described embodiments, the case where the fluid-filled mount 1 of the present invention is adopted for the elastic support structure of the engine of the automobile has been described, but the present invention is not limited to this, and the cab mount and the body are not limited thereto. It can be applied not only to various parts of the automobile such as a mount but also to various vibration generating parts other than the automobile. Also, in each example,
High-viscosity fluid was filled in the upper layer and low-viscosity fluid was filled in the lower layer.
You may make it enclose a highly viscous fluid in a lower layer part. In some cases, the moving plate 3a and the orifice panel 10 may be soaked in a viscous fluid having a viscosity opposite to that of the embodiment in a state where no load is applied.

[0030]

As described above, according to the present invention, the following effects are exhibited. According to the invention described in claim 1, a plurality of types of fluids having different viscosities and specific gravities and incompatible with each other are enclosed in the fluid chamber, and the moving plate has a high viscosity when the external load is large. On the other hand, when the load is high frequency vibration with a small external load, the moving plate moves in the fluid of high viscosity when no load is applied, and the moving plate moves in the fluid of low viscosity when the load is applied. With such a structure, when the external load is large, the load is damped by the fluid with high viscosity, and when the external load is small and high frequency vibration is generated, the vibration is damped by the fluid with low viscosity. Therefore, without complicating the supporting structure,
With one mount structure, it is possible to obtain a damping action for both large and small loads.

According to the second aspect of the present invention, a plurality of types of fluids having different viscosities and specific gravities and incompatible with each other are enclosed in the fluid chamber, and when the external load is large, the fluid having high viscosity is the orifice. By virtue of the structure in which the fluid having a low viscosity passes through the orifice hole when the external load is small while passing through the hole, it is possible to obtain a damping action for both the large load and the small load.

According to the third aspect of the invention, since the panel material is arranged along the boundary of the fluid, different damping characteristics can be obtained depending on the input direction of the load.

According to the invention described in claim 4, since the elastic means is constituted by the elastic body and the diaphragm, when an external load is applied, the deformation of both of them causes the fluid to flow smoothly. It is possible to perform the damping operation with high efficiency.

[Brief description of drawings]

FIG. 1 is a vertical sectional view of a fluid-filled mount according to a first embodiment.

FIG. 2 is a view corresponding to FIG. 1 in a state where a load is applied to the fluid-filled mount.

FIG. 3 is a view corresponding to FIG. 1 in the second embodiment.

FIG. 4 is a view corresponding to FIG. 2 in the second embodiment.

FIG. 5 is a view corresponding to FIG. 3 in a modified example.

[Explanation of symbols]

1 Fluid-filled mount 2 Support members 3 connecting members 3a Mobile plate 4 elastic body 5 diaphragm 6 fluid chamber 6a Upper region (small fluid chamber) 6b Lower area (small fluid chamber) 8 Ethylene glycol (fluid) 9 Silicon oil (fluid) 10 Orifice panel (panel material) 10b opening (orifice hole)

Claims (4)

[Claims] 1. An elastic means is provided over a connecting member attached to the vibrating portion and a supporting member attached to the vibration isolating portion, and a fluid chamber in which a fluid is sealed is formed inside the elastic means. In the fluid-filled mount described above, a moving plate that is immersed in the fluid in the fluid chamber and that moves in the fluid chamber as the coupling member moves due to the action of an external load is coupled to the coupling member. In the fluid chamber, a plurality of types of fluids having different viscosities and specific gravities and incompatible with each other are enclosed, and when the external load is large, the moving plate moves in the highly viscous fluid. When high frequency vibration with a small external load is generated, the moving plate moves in a highly viscous fluid when no load is applied, and when the applied load is input, the moving plate has a high viscosity. Fluid-filled mount which is characterized in that so as to move in the fluid are. 2. An elastic means is provided across a connecting member attached to the vibrating portion and a supporting member attached to the vibration isolating portion, and a fluid chamber in which a fluid is sealed is formed inside the elastic means. In the fluid-filled mount, a panel material for partitioning the fluid chamber into a plurality of small fluid chambers is provided in the fluid chamber, and the panel material is formed with an orifice hole for communicating the small fluid chambers. In the fluid chamber, a plurality of types of fluids having different viscosities and specific gravities and incompatible with each other are enclosed, and when the external load is large, the fluid having high viscosity flows through the orifice hole. A fluid-filled mount, wherein a fluid having low viscosity flows through the orifice hole when the external load is small. 3. The fluid-filled mount according to claim 2, wherein the panel material is arranged along a boundary portion of the fluid enclosed in the fluid chamber. 4. The fluid-filled mount according to claim 1, 2, or 3, wherein the elastic means is installed over the connecting member and the supporting member and is deformed as the connecting member moves due to the action of an external load. Fluid encapsulation characterized by an elastic body and a diaphragm that is disposed at a predetermined distance from the elastic body and that deforms with the volume change of the fluid chamber accompanying the movement of the connecting member. Expression mount.