JPH0637914B2 - High-viscosity fluid-filled mount device - Google Patents

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a high-viscosity fluid-filled mount device, and more particularly to a novel automotive mount device (vibration support) utilizing a viscous damping force due to shear shear stress of a high-viscosity fluid. Body), a so-called automobile anti-vibration rubber.

(Background Art) Anti-vibration rubber for automobiles, such as engine mounts, strut mounts, tension rod bushes, arm bushes, FF engine roll stopper anti-vibration rubbers, etc., has the required anti-vibration properties such as sudden start, sudden brake, and shake. Energy absorption using braking or damping at the time of a large input, and resonance coupled vibration is a reduction of the vibration transmitting force by damping, and a reduction of the vibration transmitting force at the time of high frequency minute input from engine rotation or road noise. . That is, it is generally necessary for the anti-vibration rubber to have both a high damping characteristic at a low frequency large amplitude and a low dynamic spring characteristic at a high frequency minute amplitude.

However, as long as a solid rubber material is used for the anti-vibration rubber, the dynamic spring characteristics at high frequencies will be improved if it is made possible to exhibit high damping characteristics. If it is made small without changing, the damping force will necessarily be small. Therefore, it is difficult for a rubber material to realize an anti-vibration rubber having both anti-vibration properties at the same time.

To solve this problem, a fluid-filled type anti-vibration rubber structure has been proposed in recent years (Japanese Patent Publication No. 48-36151 and Japanese Patent Publication No. 52).
-16554, etc.). This fluid-filled type anti-vibration rubber is equipped with two fluid chambers, and an orifice is provided in the part that separates the two fluid chambers. In addition, a structure in which the enclosed fluid flows back and forth through the orifice into the other fluid chamber is adopted. Then, by virtue of the conventional fluid flow through such an orifice, a fluid viscous force and a fluid inertia force are exerted by the fluid flowing in a narrowed thin tube, and in a mechanical model, the mass corresponding to the fluid inertia force is
It will be shown in a method of arranging a spring and a system supported by damping in parallel.

The inertial force generated by the movement of the fluid, that is, the mass-spring system plays a large role in the vibration input in the low frequency region, and plays the role of one phase shifter. Therefore, unlike the usual mass-spring system, the fluid flow is originally caused by the pressure between the chambers, and the pressure fluctuation is initially or 180 ° deviated with respect to the input vibration. The mass-spring system, which comes from the fluid flow in the orifice, is a vibration system in which the phase shifts as the frequency increases from 180 ° to 0 ° conversely. It is advanced by 90 ° with respect to the vibration input, and it has a characteristic that a large damping force is apparently exhibited. Therefore, after passing the resonance point of the mass-spring system due to the inertial force due to this fluid movement, the movement of the mass part stops, that is, the movement of the fluid disappears and vibration of only the main chamber occurs, as in a normal mass-spring system. For the input, it will transition to a support system where there is no place for fluid to transform into a very rigid mount.

In order to avoid the rigidity of the mount in the high vibration frequency region after resonance caused by the inertial force of the orifice portion, it is possible to install the movable plate or the movable film structure in the center of the partition plate.
Although proposed in JP-A-53-5376 and JP-A-57-9340, the structure supporting the movable plate or the movable film can be regarded as another orifice. is there. That is, in the low frequency region, only a small part of the volume change on the main chamber side with respect to the vibration input is taken in advance, the movable plate or the movable film changes, and the volume change is absorbed, while above a certain volume absorption amount, Since the absorption capacity is limited, the rest will be given as the flow of the orifice.

However, if the frequency increases and the flow of fluid through the orifice disappears due to the previous circumstances, only the movement of the movable plate or the movable film is left, and they are originally set with a considerable area in the center of the partition. Therefore, the fluid pressure increase on the main chamber side due to the vibration input is released to the high frequency region, and eventually the mount is prevented from becoming rigid. However, the movement of the movable plate or the movable membrane is the flow of the fluid consisting of the part that constitutes the movable plate / movable membrane as it is, and can be regarded as one orifice. , The behavior of the mass-spring system is shown in the next high vibration frequency region, and finally the mount becomes rigid due to the same situation.

In other words, this type of fluid-filled mount usually requires a mass-spring system to be attached, and a mass of 10 kg or more must be attached in order to exhibit the behavior in the low frequency region. Although it can be said that the mount is very excellent in that its resonance can be easily matched to a low frequency of about 5 to 25 Hz by utilizing the inertial mass coming from the fluid flow, but on the other hand, its disadvantage is It can be said that the mount cannot essentially prevent the mount from becoming rigid in the high frequency range.

Therefore, there is no rigidization of the mount when high frequency vibration is input,
In addition, a mount structure that can ensure the damping of low-frequency large-amplitude vibration at the time of input is desired. For this purpose, it is possible to utilize the viscous force of high-viscosity silicone oil. That is, high-viscosity silicone oil has a high viscosity in low-speed shear flow, but its viscosity decreases in high-speed shear flow. It is thought that it could be dealt with by directly connecting to the input.

Based on this idea, a structure has been proposed in which a resistance plate is introduced into high-viscosity silicone oil and a vibrating input is connected using a thick connecting rod (West German Patent No. 3233456).
See the specification, etc.) However, in such a structure, the high-viscosity fluid between the bottom surface of the high-viscosity fluid-enclosed container and the resistance plate is inevitably made into an elastomer, that is, because of its high viscosity, the property as a liquid spring at the time of high-speed deformation and volume modulus The spring-up coming from is caused, and the mount becomes rigid. To avoid this stiffening,
A structure corresponding to a movable plate of a fluid-filled mount has been devised, in which a certain gap is provided in the connecting portion between the thick connecting rod and the resistance plate so that the resistance plate does not move at the time of input of high frequency micro-vibration (Japanese Patent Laid-Open No. Sho-Kaiyo). No. 59-1831), however, this structure is not effective for rigidizing the mount based on the input of high frequency vibration of 300 Hz or higher.

(Structure of the Invention) Here, in view of the circumstances as described above, the present inventors have
As a result of earnest research on a mounting device in which a high-viscosity fluid is enclosed, it is possible to prevent the mount from becoming rigid in a high frequency region.
Moreover, they have found a mount structure that can secure a damping force at a low frequency and large amplitude to some extent.

First, when investigating a mounting device in which such a highly viscous fluid is enclosed, the present inventors investigated the mechanical behavior caused by the highly viscous fluid and the resistance plate. That is, silicone oil, which is one of the highly viscous fluids, is put in a cylindrical container, while the resistance plate and the vibration transmission connecting rod are fixed and pushed into the silicone oil, and a vibration input is given to output. We investigated the mechanical behaviors that were observed, and as a result, some interesting findings were obtained.

That is, the resistance force obtained by the vibration of the resistance plate is the behavior of the fluid between the resistance plate and the bottom surface of the container, the behavior between the outer circumferential portion of the resistance plate and the container cylindrical wall portion, Among them, the resistance force between the resistance plate and the bottom surface of the container is displaced by the resistance component between the resistance plate and the container bottom, which has the property of an elastomer as the resistance plate presses the fluid. As a result, a volume change occurs between the resistance plate and the bottom surface of the container, which appears as the sum of the shear shear force (stress) component caused by the outward radial flow from the cylindrical volume center. . On the other hand, the resistance force of the fluid between the outer circumferential portion of the resistance plate and the cylindrical wall portion of the container is basically only shear shear force, but if this shear shear force is large, the resistance plate and the container bottom surface The volume change between and is suppressed, and consequently the fluid movement is eliminated, and only the elastomer component force is increased.

Therefore, if you try to extract the viscous force of the viscous fluid = shear shear force as much as possible, the elastomeric force remains,
It suffices to reduce the thickness of the resistance plate and increase the distance between the outer periphery of the resistance plate and the wall surface of the container. This circumstance is recognized in the previous application example of the high-viscosity silicone oil, but the present inventors have found another property. That is, it is a fact that the shear shear force can be improved by making the distance between the resistance plate and the bottom surface of the container short without increasing the force component of the elastomer too much.

However, it is impossible to embody this characteristic in the structure of the conventional high-viscosity fluid-filled mount. This is because the distance between the resistance plate that can improve the shear shear force and the bottom of the container is generally about 1 mm to 8 mm, but the resistance plate is made of a rigid material such as iron or resin. This is because, if there is a vibration amplitude over this distance, the resistance plate will hit the bottom of the container when manufactured, and the performance as a vibration isolating rubber (mount) will be impaired.

The present invention has been completed on the basis of such knowledge, and is characterized by (a) first and second mounting members arranged with a predetermined gap, and (b) ) A rubber elastic body interposed between the first and second mounting members and connecting the mounting members to each other; and (c) the rubber elastic body, at least a part of which is defined by the rubber elastic body. A sealed fluid chamber located at, and (d) a highly viscous fluid comprised of silicone oil having a kinematic viscosity of at least 10,000 centistokes enclosed within the fluid chamber;
(E) In the fluid chamber, a desired shear shear stress can be induced in the highly viscous fluid at two action surfaces, at least one of which is made of a rubber elastic material and which substantially face each other in the vibration input direction. And a slit forming means for forming a narrow gap which is 8 mm or less when mounted between two members to which vibration is transmitted.

Therefore, in the high-viscosity fluid-filled mount device according to the structure of the present invention as described above, at least one of the working surfaces forming the narrow gap forming means for forming the narrow gap that causes the desired shear shear stress in the high-viscosity fluid is provided. , Even if a vibration amplitude exceeding a narrow gap formed by it is input because it is made of a predetermined rubber elastic material, or if the fluid pressure becomes high, the action made of such a rubber elastic material The deformation of the surface effectively absorbs the pressure, which can effectively prevent or suppress the rise of the dynamic spring or the rigidization of the mount, and by adopting such a configuration, A gap is also possible, and a high damping force can be obtained.

Further, in the space formation by the slit forming means according to the present invention, another excellent effect can be enjoyed. That is, the structure of the conventional mounting device in which a high-viscosity fluid is enclosed forms a predetermined gap between the connecting rod that supports the resistance plate and the resistance plate, so as to cope with the rise of the dynamic spring when high-frequency vibration is input. However, in reality, since a high-viscosity fluid is used for the gap, when high-frequency vibration of a certain level or more is input, the effect of lowering the dynamic spring can no longer be exerted. As described above, by forming a narrow space by the action surface made of a rubber elastic material in the fluid chamber, the action surface made of such a rubber elastic material bends against the elastomeric force at the time of pressing,
It is a very effective means for making the mount rigid by reducing the movement of the high-viscosity fluid against the rise of the dynamic spring when high-frequency vibration is input.

Note that such an effect naturally brings about a certain decrease in the damping force at the time of vibration input of low frequency and large amplitude, but depending on the purpose of the anti-vibration rubber (mounting device), such an action surface is It is considered as an advantage that the hardness of the rubber elastic material to be provided can be freely set, and thus the structure according to the present invention can provide a gap formed by two working surfaces, and at least one of the working surfaces. It can be said that it has a degree of freedom that is appropriately designed depending on the combination of hardness and viscosity of silicone oil.

By the way, in the high-viscosity fluid-filled mount device according to the present invention as described above, the slit forming means extends from the one of the first and second mounting members to the other side at a predetermined height in the fluid chamber. A structure that includes a plate-like protrusion made of a rubber elastic material and in which the narrow gap is formed between the top surface of the protrusion and the other mounting member, or in the fluid chamber, the first And first and second plate-like projecting portions made of a rubber elastic material and extending from the second mounting member so as to face each other at a predetermined height, and the top surfaces of the first and second projecting portions. A structure in which the narrow gap is formed therebetween is adopted. It should be noted that the first protrusion and the second protrusion are formed to have different hardnesses as needed, so that tuning for input vibration can be effectively performed.

Further, according to another embodiment of the present invention, the slit forming means is a non-fixed independent independent member housed in the fluid chamber,
Preferably, a block body made of a rubber elastic material is included, and each of the narrow portions is provided between the block body and the first and second attachment members or an action portion having a predetermined thickness made of the rubber elastic material provided on them. A gap is formed.

The mounting device according to the present invention is composed of an inner cylinder member and an outer cylinder member in which the first and second mounting members are concentrically or eccentrically arranged, and the inner cylinder member and the outer cylinder member. The rubber elastic body is interposed between the inner cylindrical member and the outer cylindrical member to form the sealed fluid chamber, and is connected to them by a bush type structure. However, in the structure in which the rubber elastic body has a cylindrical shape, and the openings at both ends of the cylindrical rubber elastic body are covered with the first and second mounting members, respectively, the fluid chamber There is no problem even if it is a mount type structure in which the is formed.

Further, in the high-viscosity fluid-filled mount device according to the present invention, the gap formed by the narrow gap forming means is such that the high-viscosity fluid is formed by the two action surfaces that are substantially opposite to each other in the vibration input direction. However, in the present invention, such a mounting device is provided with the first and second members between which the vibration is transmitted, in particular, in a sufficiently narrow interval so as to induce a desired shear shear stress. When it is mounted via the mounting member of No. 2, the gap is set to 8 mm or less, preferably 5 mm or less. Further, even if such a gap is substantially zero when the mounting device is mounted, a certain gap is formed between the two working surfaces by the input vibration, and the gap penetrates into the gap. It is also possible to cause the desired shear shear stress by viscous fluid. It should be noted that the gap formed by the slit forming means is practically determined with a lower limit of about 1 mm.

Furthermore, as the highly viscous fluid having a high kinematic viscosity used in the highly viscous fluid-filled mount device according to the present invention, silicone oil is used, and at least 10,000 centistokes or more of such silicone oil is used. The one having a kinematic viscosity of 100,000 to 1,000,000 centistokes is preferably used.

(Examples) Hereinafter, in order to more specifically clarify the present invention, some examples of the present invention will be described in detail with reference to the drawings.

First, in the mount type apparatus according to the present invention shown in FIG. 1, annular caulking metal fittings 4 are integrally provided on both ends of a cylindrical rubber elastic body 2 by an integral vulcanization molding method. By the caulking fixing by the caulking metal fittings 4 and 4, the both ends of the cylindrical rubber elastic body 2 are covered with the lids 6 and 8 constituting the first and second attachment members, respectively. A sealed fluid chamber 10 is thus formed in the rubber elastic body 2. The fluid chamber 10 is filled with silicone oil (highly viscous fluid) having a high kinematic viscosity.

Further, the lid bodies 6 and 8 which cover and close the opening portions at both ends of the rubber elastic body 2 have mounting bolts 12 and 14 for mounting between the two members to which vibrations are transmitted, respectively at the center portion thereof. The rubber blocks 16 and 18 having a predetermined height and having a predetermined height, which are vulcanized and adhered to the inner surfaces thereof, are integrally formed. And
The rubber blocks 16 and 18 of the lids 6 and 8 are opposed to each other in the fluid chamber 10 and extend at a predetermined height, and their top surfaces are flat surfaces having a predetermined width.
0 and 22 are configured. That is, the rubber blocks 16 and 1 of the lids 6 and 8 are fixed by crimping the both ends of the rubber elastic body 2 of the lids 6 and 8.
The top surfaces 20 and 22 of 8 are a predetermined distance: 1,
Generally, they are made to face each other substantially in the vibration input direction (vertical direction in the figure) with a narrow gap of about 1 mm to 8 mm.

Therefore, in the viscous-fluid-filled type mounting device having such a structure, the mounting bolt 1 for the lids 6 and 8 is used.
It is mounted between two members to which vibration is transmitted via 2 and 14, and when the vibration is input in the vertical direction in the figure, it is provided so as to protrude from the opposing lids 6 and 8 into the fluid chamber 10. In the narrow space between the opposite top surfaces 20 and 22 of the rubber blocks 16 and 18, a pressing force acts on the high-viscosity fluid existing therein, and the high-viscosity fluid is removed outward (peripheral portion) from the space. From the place where
A flow is induced in such a highly viscous fluid, and shear shear stress proportional to the velocity gradient of the flow is generated. Then, the damping force is caused by the shear stress in proportion to the area subjected to such stress, in other words, the size of the top surfaces 20 and 22.

By the way, as shown in FIG. 1, the present inventors compared the vibration damping characteristics of the high-viscosity fluid-filled mount device according to the present invention with a conventional mount device, and the results are shown in Tables 1 and 2 below. As shown in FIG. 3, the mounting device according to the present invention is
It exhibits excellent dynamic characteristics in the high frequency range, especially vibration damping force.

The mounting device used in this comparative experiment was a normal solid type rubber mount in the comparative example (1), and in the comparative example (2), the fluid chambers were communicated by the orifices. It is a fluid-filled mount that does not have a movable plate, and has a tight structure, and is a comparative example (3).
Is a normal fluid-sealed mount having a movable plate together with an orifice for communicating between fluid chambers, and Comparative Example (4) is a conventional mount in which a gap is provided between the resistance plate and a connecting rod supporting the resistance plate. High-viscosity fluid (1 million centistokes silicone oil) enclosed mount device. On the other hand, the examples (1) and (2) of the present invention each have a structure as shown in FIG. 1, and as the highly viscous fluid, a silicone resin having a kinematic viscosity of 100,000 centistokes is used. Oil is used, and the rubber hardness of the protruding rubber blocks 16 and 18 is 40 ° HS for the former and 80 ° HS for the latter.

In short, according to the Table 1, each of the mounting of the static spring constant _(K S), the low-frequency, large-amplitude (5 Hz, ± 1 mm)
Static spring constant (Kd), loss coefficient (C), high frequency small amplitude (100 Hz, ± 0.05 mm) dynamic spring constant (Kd ₁₀₀ ), dynamic magnification (Kd ₁₀₀ / K _S ).
Also, the evaluation result of the transmission force at the time of high frequency vibration input of 300 Hz or more has been clarified, but as is clear from the comparison thereof, both of the invention examples (1) and (2) have the dynamic magnification ( It has a low Kd ₁₀₀ / K _S ), is excellent in its dynamic characteristics, and also has good results in damping force.

Further, the graphs of FIGS. 2 and 3 show the transmission force characteristics of the respective mounts with respect to the vibration frequency when a constant vibration is applied with an amplitude of ± 0.05 mm. Also, the transmission force increases as the vibration frequency increases, while the mounts (1) and (2) according to the present invention both show flat transmission force characteristics.
In particular, excellent results are shown at a transmission force of 300 Hz or higher.

The outline of the high-viscosity fluid-filled mount device according to the present invention has been described above in detail based on the specific example of the mount type illustrated in FIG. 1. However, the present invention provides a mount device as a vibration-proof support. Can be applied to various types, and some examples thereof are shown in FIGS. 4 to 6. The same parts as those of the specific example in the mounting devices shown in the respective drawings are designated by the same reference numerals, and detailed description thereof will be omitted.

First, the mount device shown in FIG. 4 has a metal restraining ring 24 integrally formed on the outer peripheral portion of the cylindrical rubber elastic body 2 that defines the fluid chamber 10 in the example of FIG. Cage,
By suppressing the outward deformation of the rubber elastic body 2 by the restraint ring 24, the static spring constant improves the damping force.

The mount device shown in FIG. 5 is also of the mount type as in the previous two examples, but unlike the previous two examples,
In the fluid chamber 10 formed in the cylindrical rubber elastic body 2,
A cylindrical rubber block 26 having a predetermined height that is not fixed and is housed in the lids 6 and 8 is housed in the rubber block 26.
Are suspended in a predetermined high-viscosity fluid (silicone oil) enclosed in the fluid chamber 10. Further, on the inner surfaces of the lids 6 and 8 facing the rubber block 26, the rubber action part 2 having a predetermined thickness is formed.
8 and 30 are integrally provided, and narrow gaps capable of causing a predetermined shear shear stress are formed between the rubber action portions 28 and 30 and the upper and lower surfaces of the rubber block 26, respectively. .

Therefore, in the mounting device having such a structure, the mounting device is mounted between the two members to which the vibration is transmitted via the mounting bolts 12 and 14 which are planted in the lids 6 and 8 to input the vibration. When squeezed, the rubber action part 2 of the one lid 6
8 between the rubber blocks 26 and the rubber blocks 26, and between the rubber blocks 26 and the rubber operating portion 30 of the other lid 8 which face each other. The highly viscous fluid (silicone oil) that is subjected to pressure action causes a radial flow of the highly viscous fluid toward the outside, and effective shear shear stress is generated there, which is effective. A viscous damping force is generated, and the desired vibration damping is achieved.

Further, the mounting device of FIG. 6 is characterized in that it is a bush type and a structure, and a pair of ring-shaped rubber bushes 36 are provided between an inner cylindrical metal fitting 32 and an outer cylindrical metal fitting 34 which are concentrically arranged. , 38 are press-fitted at their both ends to form a sealed annular fluid chamber 40 at the central portion in the axial direction. In addition,
Each of the two rubber bushes 36, 38 has a rubber portion 3
Inner rings 36b, 38b are formed on the inner and outer peripheral surfaces of 6a, 38a.
And outer rings 36c, 38c, respectively. The inner rings 36b, 38b are press-fitted into the outer peripheral surface of the inner tubular fitting 32, while the outer rings 36
The portions c and 38c are press-fitted into the inner peripheral surface of the outer tubular metal fitting 34, respectively, and the end portions of the outer tubular metal fitting 34 are caulked, whereby the rubber bushes 36,
8 is fixed to both ends in the axial direction.

Further, the fluid chamber 4 defined by the rubber bushes 36 and 38 in the axial direction between the inner tubular metal fitting 32 and the outer tubular metal fitting 34.
An annular rubber block 42 having a rectangular cross section and having a predetermined height integrally extending from the outer peripheral surface of the inner tubular metal fitting 32 is integrally provided in the outer peripheral surface of the inner tubular metal fitting 32. The outer peripheral surface of the rubber block 42 and the outer tubular metal fitting 34 are integrally provided. A narrow gap that can cause a predetermined shear shear stress is provided in a ring shape in the circumferential direction between the inner circumferential surface and the inner circumferential surface. In other words, the outer peripheral surface of the rubber block 42 and the inner peripheral surface of the outer tubular metal fitting 34 constitute two working surfaces opposed to each other, and thereby an annular shape along the inner surface of the outer tubular metal fitting 34. The narrow gap is formed.

Therefore, the mounting device having such a structure has the inner tube fitting 3
One of the two members to which the vibration is transmitted is inserted as a shaft member into the center hole of the second member, while the other member of the vibration transmitting member is press-fitted to the outer peripheral surface of the outer tubular metal fitting 34, and these two vibrations are transmitted. Vibration input is performed between the members, but at that time, the vibration input is in the direction perpendicular to the axis, and therefore, the inner peripheral surface of the outer tubular metal fitting 34 that substantially opposes in the vibration input direction. In the narrow gap between the rubber block 42 and the outer peripheral surface of the rubber block 42, the high-viscosity fluid (silicone oil) present therein is pressed, and effective shear shear stress is generated there. It is possible to exert a great vibration damping force.

Note that the present invention can be variously modified, modified, improved, etc. based on the knowledge of those skilled in the art in addition to these specific examples without departing from the spirit thereof. It is to be understood that it also includes those of various embodiments.

For example, in the mount type embodiment shown in FIGS. 1, 4, and 5, the rubber blocks 16, 18 or 26, 28, 30 each of which has two opposing working surfaces made of a rubber elastic material. The structure is such that the absorbing action due to the elastic deformation of such an action surface can be exhibited. Of course, even if one of such action surfaces is made of a rigid material such as metal, It doesn't matter.

Further, as in the above-described embodiment, the two rubber blocks 16 and 18 or the rubber block 26 and the rubber operating portion 28 or 30 that provide two opposing working surfaces are configured to have different hardnesses, particularly different rubber hardnesses. It is also preferable that the working surfaces having such different rubber hardnesses can effectively generate the radial flow of the highly viscous fluid in the narrow gap formed by the working surfaces.

Furthermore, in each of the above embodiments, the shear shear deformation region is formed so as to be positioned in a direction perpendicular to the vibration input direction, but considering the deformation direction of the mounting device,
There is no problem even if the shear shear deformation region is provided so as to be inclined with respect to the vibration input direction.

In addition, the anti-vibration rubber structure (mounting device) having the shear shear deformation region of the highly viscous fluid against such vibration deformation is not only for the engine mount but also for the strut mount, tension rod bush, arm bush, roll stopper, etc. Can be advantageously used as many anti-vibration rubbers for automobiles.

(Effects of the Invention) As is clear from the above description, the high-viscosity fluid-filled mount device according to the present invention retains the damping force at the time of vibration input of low frequency and large amplitude, and makes the mount rigid in the high frequency region. Is effectively suppressed or prevented, and as a result, it exerts an excellent damping force against high-frequency vibrations, particularly high-frequency vibrations of 300 Hz or higher. It became possible to cope with various vibrations such as idle vibration and muffled sound.

In addition, the high-viscosity fluid-filled mount device according to the present invention exhibits a flat transmission force characteristic with respect to the vibration frequency, and in this respect as well, a peculiar transmission force different from various conventional mount devices is provided. It shows the characteristics.

[Brief description of drawings]

FIG. 1 is a sectional view showing an example of a highly viscous fluid-filled mount device according to the present invention. 2 and 3 are graphs showing transmission force characteristics of various mounts with respect to vibration frequencies. 4 to 6 are sectional views showing other different examples of the high-viscosity fluid-filled mount device according to the present invention. 2: Rubber elastic body, 4: Caulking metal fittings 6, 8: Lid body, 10, 40: Fluid chamber 12, 14: Mounting bolt 16, 18, 26, 42: Rubber block 20, 22: Top surface (working surface) 24 : Restraint ring 28, 30: Rubber action part 32: Inner tubular metal fitting, 34: Outer tubular metal fitting 36, 38: Rubber bush

Claims (9)

[Claims] 1. A first and a second mounting member arranged with a predetermined gap therebetween; a rubber elastic body interposed between the first and the second mounting member and connecting the mounting members to each other. When;
A sealed fluid chamber located at least partially within the rubber elastic body defined by the rubber elastic body; a silicone oil enclosed within the fluid chamber and having a kinematic viscosity of at least 10,000 centistokes A high-viscosity fluid consisting of: a desired shear shear stress of the high-viscosity fluid at two working surfaces in the fluid chamber, at least one of which is made of a rubber elastic material and which substantially face each other in the vibration input direction. A high-viscosity fluid, which has a narrow gap forming means for forming a narrow gap of 8 mm or less when mounted between two members to which vibrations are transmitted; Enclosed mount device. 2. The plate-like protrusion made of a rubber elastic material, wherein the slit forming means extends from the one of the first and second mounting members to the other side at a predetermined height in the fluid chamber. The mounting device according to claim 1, further comprising: a narrow gap formed between the top surface of the protrusion and the other mounting member. 3. The plate-like first and second plate-like members made of rubber elastic material, wherein the slit forming means extend in the fluid chamber from the first and second mounting members so as to face each other at a predetermined height. The mounting device according to claim 1, further comprising a second protrusion, wherein the narrow gap is formed between top surfaces of the first and second protrusions. 4. The third protrusion according to claim 3, wherein the first protrusion and the second protrusion have different hardnesses.
The mounting device according to the item. 5. The slit forming means includes a non-fixed independent block body housed in the fluid chamber, and provided on the block body and the first and second attachment members or them. The mounting device according to claim 1, wherein the narrow gaps are formed between the narrow gaps and the action portion made of a rubber elastic material and having a predetermined thickness. 6. The mounting device according to claim 5, wherein the block body is made of a rubber elastic material. 7. The first and second mounting members are composed of an inner cylinder member and an outer cylinder member which are arranged concentrically or eccentrically, and between the inner cylinder member and the outer cylinder member. The mount according to claim 1, wherein the rubber elastic body is interposed to connect the inner tubular member and the outer tubular member while forming the sealed fluid chamber therebetween. apparatus. 8. A structure in which the rubber elastic body has a cylindrical shape, and openings at both ends of the cylindrical rubber elastic body are covered with the first and second mounting members, respectively, The mounting device according to claim 1, which is formed. 9. The mount device according to claim 8, wherein the rubber elastic body having a cylindrical shape is provided with a restraint ring arranged on an outer peripheral portion thereof.