JPH09280303A - Liquid sealing type vibration control device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To ensure duration strength even at high temperature and to obtain a predetermined mobile spring characteristics. SOLUTION: Between an upper part connection member 9 connected to a vibration body and a lower part connection member 99 connected to a vehicle side, a vibration control rubber body 1 is provided which has a truncated cone- like configuration and is formed primarily of natural rubber. At a rubber part of this vibration control rubber body 1, a second orifice for liquid flow is provided. A rubber film-like elastic body 2 and a cylinder-like metal fitting 22 are provided between the upper part connection part 9 and a partition plate 4. This elastic member 2 is formed of heat-resistant rubber member. A liquid is filled in a space formed with the elastic member 2, a cylinder-like metal fitting 22 and the partition plate 4 thereby forming a primary chamber 5 and a second liquid chamber 51. An auxiliary chamber 6 is provided at a lower part of the liquid chamber by sandwiching the partition plate 4. An orifice 3 for connecting the primary chamber 5 and the auxiliary chamber 6 is provided.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a liquid-filled type vibration damping device capable of obtaining a vibration damping effect based on the flow of a fluid (liquid) sealed inside, and particularly to a high temperature The present invention relates to a liquid-filled type vibration damping device which is designed to have higher durability strength below.

[0002]

2. Description of the Related Art Among vibration isolation devices, particularly in engine mounts for automobiles, an engine, which is a power source, is operated under various conditions from idling to the maximum rotation speed. Since it is used, it must be able to handle a wide range of frequencies. Therefore, a so-called liquid-filled engine mount (anti-vibration device) in which two liquid chambers are provided inside and an orifice is connected between the chambers has already been devised and is known. However, such a conventional liquid-filled engine mount is placed under a high temperature such as in an engine room, and the main spring portion that bears a constant static load (static load), that is, the insulator The part is formed of a rubber-like elastic body. Therefore, there is a problem that the portion of the insulator causes fatigue deformation (sag). In order to solve such problems as fatigue deformation (sagging) at high temperatures, a liquid-sealed engine mount (prevention of protection) using a metal coil spring as an elastic body forming the main spring is used. A shaker) has already been developed (for example, described in JP-A-5-10382).

[0003]

The metal coil spring used for the main spring is excellent in heat resistance and the metal absorbing the vibration input from the vibrating body is the metal. Therefore, it is possible to avoid the problem that the dynamic spring constant increases with respect to high frequency vibration. However, in recent engine mounts, there is a tendency for the engine mounts to be mounted in a tilted state in order to improve exercise performance when the vehicle is traveling. In such a case, in the case where the main spring is a coil spring, the static load from the engine or the like is input in the direction perpendicular to the coil axis of the coil spring.
As a result, bending stress is applied to the member forming the coil spring in addition to the torsional stress based on the compressive force. Therefore, if the coil spring is placed in such a usage state, the durability of the coil spring may decrease. In order to solve such a problem, a metal coil spring is not used for the main spring, and the heat resistance is excellent, and the dynamic spring constant is not increased against high frequency vibration. It is an object (problem) of the present invention to provide a liquid-filled type vibration damping device.

[0004]

Means for Solving the Problems In order to solve the above problems, the present invention takes the following measures. That is, the upper connecting member attached to the vibrating body side, the lower connecting member attached to the vehicle body side, the anti-vibration rubber body for blocking the vibration from the vibrating body between the upper and lower connecting members, and the lower connecting member. A tubular metal fitting having a tubular shape, one end of which is coupled, an elastic member provided between an upper opening of the tubular metal fitting and the upper connecting member, and a partition formed by the elastic member. Which has a main chamber in which an incompressible fluid (liquid) is enclosed and a diaphragm made of a rubber film member as one chamber wall, in which the liquid is enclosed. A sub chamber and an orifice connecting the main chamber and the sub chamber,
Further, regarding a liquid-filled type vibration damping device comprising a partition plate for partitioning between the main chamber and the sub chamber, the elastic member is made of a heat resistant rubber material, while the vibration damping rubber body is The vibration isolating rubber body is arranged in the main chamber, and the vibration isolating rubber body has a truncated cone shape that is formed so as to spread in a divergent manner from the upper connecting member to the partition plate.

[0005] By adopting such a configuration, the present invention has the following functions. That is, the anti-vibration rubber body forming the present liquid-filled anti-vibration device has a shape of a frustoconical shape of a divergent end, and mainly,
The vibration-proof rubber body is deformed in the compression direction to bear the mass of the vibration body such as the engine and the load from the vibration body. Therefore, unlike the above-mentioned conventional metal coil springs,
Even if a load in the direction perpendicular to the axis is applied, no particular problem occurs.
Further, in the present invention, since the cover-like elastic member made of a heat-resistant member is provided on the outside of the above-mentioned vibration-proof rubber body, it can be exposed to high temperatures such as an engine room. Even when installed, the vibration-proof rubber body portion is not directly exposed to high temperature. In addition, the surface is also shielded from oxygen in the atmosphere. Therefore, the anti-vibration rubber body of the present invention is not required to have high heat resistance (oxygen deterioration resistance). As a result, it becomes possible to use an ordinary vibration-proof rubber material mainly composed of natural rubber, and there is no need to worry about the problem that the dynamic spring constant increases with respect to high-frequency vibration. That is,
Ratio (Kd) of dynamic spring constant (Kd) and static spring constant (Ks)
/ Ks) does not become high, and the effect of blocking vibration in the high frequency range is sufficiently secured.

Next, the invention according to claim 2 will be described. This is also basically the same as the first aspect. The feature thereof is that in addition to the one described in claim 1, the second liquid chamber is formed by the space portion partitioned by the vibration isolating rubber body and the partition plate, and the vibration isolating is further provided. The second orifice is provided in a part of the rubber body so as to communicate between the main chamber and the second liquid chamber. By adopting such a configuration, in the present invention, in addition to the invention described in claim 1, the following action is further exhibited. That is, in addition to the resonance action of the liquid in the orifice (first orifice) that connects the main chamber and the sub chamber, the main chamber and the second liquid chamber are connected to each other with respect to vibration of a specific frequency. It becomes possible to add the resonance effect of the liquid in the second orifice. As a result, it becomes possible to contribute to the idling vibration, or the isolation of vibration and noise in the high frequency range.

Next, the third aspect of the present invention will be described. This is also basically the same as the first and second aspects. The feature thereof is that in addition to the one described in claim 1 or 2, the vibration-proof rubber body is configured to have an inner cylinder and an outer cylinder, and the main chamber and the sub-chamber are provided. The orifices (first orifices) that connect the two are formed by the inner peripheral surface of the outer cylinder and the inner peripheral surface of the tubular fitting, or the inner peripheral surface of the outer cylinder and the partition That is, it is formed on the upper surface of the plate. By adopting such a configuration, in the present invention, in addition to the invention described in claim 1 or claim 2, the following action is further exhibited. That is, it becomes possible to form (manufacture) the anti-vibration rubber body as a separate component, like the partition plate or the diaphragm, and to improve the efficiency of the assembling work (assembling work) in these liquids. Will be planned. Further, since the orifice is formed by the outer peripheral surface of the outer cylinder and the inner peripheral surface of the tubular metal fitting, it is not necessary to provide the orifice in the partition plate or the like, and the formation (manufacturing) of the partition plate is simplified. As a result, the manufacturing cost can be reduced also by these.

[0008]

BEST MODE FOR CARRYING OUT THE INVENTION An embodiment of the present invention will be described with reference to FIGS. Although it relates to the embodiment of the present invention, as shown in FIG. 1, an upper connecting member 9 attached to the vibrating body side, a lower connecting member 99 attached to the vehicle body side, and upper and lower connecting members 9 and 99 are attached. An anti-vibration rubber body 1 which is interposed between the vibration isolating rubber body 1 and the upper and lower connecting members 9 and 99, and which is provided between the upper and lower connecting members 9 and 99 and in which a non-compressible fluid (liquid) is enclosed.
And a sub chamber 6, an orifice (first orifice) 3 connecting the main chamber 5 and the sub chamber 6, and a partition plate 4 for partitioning the main chamber 5 and the sub chamber 6 from each other. It is basically composed of a diaphragm 7 provided below the sub chamber 6. Further, in such a basic structure, the vibration isolator is provided between the upper connecting member 9 and the upper opening of the tubular metal fitting 22 whose lower end is connected to the lower connecting member 99. A rubber film-shaped elastic member 2 formed so as to wrap the rubber body 1 is provided. And such an elastic member 2
A liquid chamber including the main chamber 5 is formed by filling a liquid in the space formed between the partition plate 4 and the partition plate 4.

In such a basic structure, the anti-vibration rubber body 1 is formed so as to widen toward the partition plate 4 side from the upper connecting member 9 as shown in FIGS. 1 and 2. It has a truncated cone shape and is made of a vibration-proof rubber material mainly composed of natural rubber. Therefore, an increase in the dynamic spring constant (Kd) of the vibration input in the high frequency range is avoided. As shown in FIG. 1, the main body (rubber part) of the anti-vibration rubber body 1 having the above-described structure has a second orifice formed of a flow passage for liquid flow so as to vertically penetrate therethrough. 15 is provided. Then, as shown in FIG. 1, between the lower portion of the vibration isolating rubber body 1 having such a structure and the partition plate 4, the main chamber 5 is provided through the second orifice 15 as shown in FIG. A second liquid chamber 51 formed so as to communicate with each other is provided. Further, since the present anti-vibration rubber body 1 is designed to have a certain volume based on the truncated cone shape, the vibration from the vibrating body via the upper connecting member 9 is eliminated. It is designed to be able to fully bear the static load, etc. Further, even if a static load from the vibrating body side is input in a slightly oblique direction, it is possible to sufficiently withstand.

The present anti-vibration rubber body 1 having such a structure
The inner cylinder 11 is provided on the inner diameter side thereof, and the inner cylinder 11 forms a part of the upper coupling member 9 and is provided so as to penetrate the plate 91. It is adapted to be coupled to the bolt 911 by a press-fitting means or the like. The outer cylinder 19 is formed on the outer diameter side of the anti-vibration rubber body 1 having the above structure.
Is provided. The outer cylinder 19 is formed of a sheet metal molded product or the like, and is integrally joined to the bottom surface portion of the vibration-proof rubber body 1 by vulcanization bonding means or the like. The specific structure is shown in FIG.
And an orifice (first orifice) as shown in FIG.
3 includes a cylindrical portion 191 forming a part of a side wall, and a disc portion 192 to be superposed and coupled with the partition plate 4, the lower connecting member 99 and the like. Then, the tubular portion 19
1 has an inclined surface in the cross-sectional shape of the outer cylinder 19, and the upper rubber member 1 and the upper connecting member 9 are connected to each other.
When a static load etc. is input from the side, this anti-vibration rubber body 1
It is designed to give a uniform compression force to the whole.

Further, in the above-mentioned orifice (first orifice) 3 having such a structure, as shown in FIGS. 1 and 2, the tubular metal fitting 2 is provided as an opening to the main chamber 5 side.
A main-chamber-side opening 31 in the form of a vertical groove is formed so as to scrape off a part of the elastic member 2 provided on the inner peripheral side of 2. Corresponding to this, an opening 39 to the sub chamber side (sub chamber side opening) 39 is provided so as to penetrate a part of the partition plate 4. Furthermore, as these orifices (first orifices) 3, the inner peripheral surface of the outer cylinder 19 composed of the cylinder portion 193 and the disk portion 194 and the upper surface of the partition plate 4 are provided as shown in FIG. Related to other embodiments formed as described above. This has the advantage that all of the outer cylinder 19 and the partition plate 4, which are the members forming the orifice (first orifice) 3, can be formed by a sheet-metal press-formed product. A partition plate 4 that contributes to the formation of these orifices 3 and serves to partition the main chamber 5 and the sub chamber 6 from each other.
In the present embodiment, is formed of a sheet metal molded product. In order to prevent contact (metal touch) with the inner cylinder 11, In order to secure the volume of the chamber 51, the concave portion 4 is formed in the central portion thereof.
4 are formed (see FIG. 1).

As shown in FIGS. 1 and 2, an elastic member 2 is provided on the outside of the vibration isolating rubber body 1 having the above-described structure so as to wrap the vibration isolating rubber body 1 as a whole. Has become. The elastic member 2 is made of a heat-resistant rubber material such as EPDM, the upper part of which is coupled to the plate 91 which forms a part of the connecting member 9, and the lower part is a cylindrical metal fitting. It is adapted to be integrally connected to the upper opening of 22. A flange 222 is provided at the lower end of the tubular metal member 22, and the disk of the outer cylinder 19 forming a part of the partition plate 4 and the orifice 3 is formed at the flange 222. The parts 192 and 194, the diaphragm 7, the lower connecting member 99 and the like are integrally connected by clinch connecting means or the like. The elastic member 2 forms a certain space together with the partition plate 4, and the vibration isolating rubber body 1 is installed inside the elastic member 2 so as to be entirely wrapped therein. ing.
Also, by filling the liquid in these spaces,
The main chamber 5 and the second liquid chamber 51 are formed (see FIG. 1).

A liquid-filled type vibration damping device is formed by sequentially assembling the respective components having such a structure in a container filled with a liquid or the like.
Specifically, in the liquid, first, the vibration-proof rubber body 1, the partition plate 4, the diaphragm 7, and the lower connecting member 99 are inserted into the flange portion 222 of the tubular metal fitting 22. Then, the outer peripheral parts of these parts and the disk parts 192 and 194 of the outer cylinder 19 which are integrally provided with the vibration-proof rubber body 1 are temporarily fixed. Such a temporarily fixed state is taken out of the liquid, and the flange 222 is removed.
Securely fix the place by caulking. In this way, each part that forms the liquid chamber, etc. is temporarily assembled in the liquid, and with each liquid chamber, etc., taken out of the liquid and fixed with caulking means, etc. Therefore, the final assembly work can be performed outside the liquid, and the efficiency of the assembling work (assembly work) of the liquid-filled type vibration damping device can be improved.

When a vibration load is input from the upper connecting member 9 connected to the vibrating body to the upper side of the elastic member 2 of the liquid-filled type vibration damping device having such a structure, The elastic member 2 is adapted to perform a pumping operation as the upper connecting member 9 moves up and down. Further, with the pumping operation of the elastic member 2, the liquid in the main chamber 5 passes through the orifice 3 and the sub chamber 6
It is designed to be sent to the side. During the pumping operation, in most cases, the liquid existing around the antivibration rubber body 1 is provided on the second antivibration rubber body 1 according to the operation of the antivibration rubber body 1. The orifice 15 can freely flow. In other words, the portion of the second orifice 15 does not generate a flow resistance of the liquid during the pumping operation. Although the second liquid chamber 51 and the second orifice 15 are provided in the present embodiment as described above, the opening area of the second orifice 15 is set large and the space between them is The liquid chambers 5 and 51 can be made to function as one main chamber by allowing the liquid to flow freely, and in some cases, as shown in FIG. The vibration-proof rubber body 1
It is also possible to fill the elastic material constituting the.

The operation and the like of the embodiment having the above-described configuration will be described. That is, the anti-vibration rubber body 1 forming the present liquid-filled anti-vibration device is
It is made of a rubber-like elastic material and has a certain volume. The mass of the vibrating body such as the engine and the input load (load) from the vibrating body are borne by such compression deformation of the rubber-like elastic body having a certain volume. Therefore, unlike the conventional coil spring made of metal, there is no particular problem even if a load in the direction perpendicular to the axis is applied.

Further, in the present embodiment, since the elastic member 2 made of a heat resistant member is provided on the outer side of the antivibration rubber body 1,
Even when installed in a high temperature environment such as an engine room, the portion of the antivibration rubber body 1 is not directly exposed to a high temperature. Also, there is no direct contact with oxygen. Therefore,
The vibration-proof rubber body 1 of the present embodiment is not required to have high heat resistance and resistance to oxygen deterioration. As a result, it becomes possible to use an ordinary vibration-proof rubber material mainly composed of natural rubber, and there is no need to worry about the problem of an increase in the dynamic spring constant (Kd) against high frequency vibration.
That is, the ratio (Kd / Ks) of the dynamic spring constant (Kd) and the static spring constant (Ks) does not become high, and the vibration is sufficiently cut off in the high frequency range.

Further, in the present embodiment, the second orifice 15 through which the liquid flows is provided at the antivibration rubber body 1, and the antivibration rubber body 1 is It is designed to be completely covered with the heat-resistant elastic member 2. The main chamber 5 is formed in the space defined by the elastic members 2 and the like. Therefore, when the vibration from the engine is propagated to the liquid-filled type vibration damping device, the elastic member 2 is also displaced together with the plate 91 forming a part of the upper connecting member 9 and the pump action. Will be done. As a result, the liquid in the main chamber 5 is caused to flow, and the liquid in the second orifice 15 provided at the vibration isolating rubber body 1 resonates with respect to the vibration input having a specific frequency. You can choose to let them do it. As a result, it becomes possible to contribute to the idling vibration, or the isolation of vibration and noise in the high frequency range.

[0018]

According to the present invention, the upper connecting member mounted on the vibrating body side, the lower connecting member mounted on the vehicle body side, and the anti-vibration for blocking the vibration from the vibrating body between the upper and lower connecting members. A rubber body, a tubular fitting whose one end is coupled to the lower connecting member and having a tubular shape, and an elasticity provided between the upper opening of the tubular fitting and the upper connecting member. Member and the elastic member, which is incompressible fluid (liquid) inside
And a sub-chamber having a diaphragm made of a rubber film member as one chamber wall, in which a liquid is enclosed, and the main chamber and the sub-chamber are connected to each other. Regarding a liquid-filled type vibration damping device comprising an orifice and a partition plate for partitioning the main chamber and the sub chamber, the elastic member is made of a heat resistant rubber material, while the vibration damping rubber is used. Since the body is arranged in the main chamber, and the vibration-proof rubber body is formed in the shape of a truncated cone that is formed in a divergent shape from the upper connecting member to the partition plate, the present liquid-filled vibration-damping device Is installed diagonally, and even if the load in the direction perpendicular to the axis is input to the vibration-proof rubber body,
The anti-vibration rubber body can cope with the input load by deforming the rubber-like elastic body in the compression direction.

Further, in the present invention, since the elastic member made of a heat-resistant member is provided on the outer side of the above-mentioned vibration-proof rubber body, it is installed in a high temperature such as an engine room. Even in such a case, the part of the vibration-proof rubber body is no longer directly exposed to high temperature. As a result, as the anti-vibration rubber body in the present invention, it becomes possible to use an anti-vibration rubber material mainly composed of natural rubber, and avoid the problem of an increase in the dynamic spring constant with respect to high frequency vibration. I can do it now. Therefore, the ratio (Kd / Ks) between the dynamic spring constant (Kd) and the static spring constant (Ks) does not become high, and the effect of blocking vibration in the high frequency range is sufficiently secured.

[Brief description of drawings]

FIG. 1 is a longitudinal sectional view showing the overall configuration of the present invention.

FIG. 2 is a vertical cross-sectional view showing the overall structure of a second embodiment according to the present invention.

FIG. 3 of the first orifice according to the invention,
It is a fragmentary sectional view showing the composition of the modification.

[Explanation of symbols]

 1 Vibration-Proof Rubber Body 11 Inner Cylinder 15 Second Orifice 19 Outer Cylinder 191 Cylinder 192 Disc Part 193 Cylinder 194 Disc Part 2 Elastic Member 22 Cylindrical Metal Fitting 222 Flange 3 Orifice (First Orifice) 31 Main Chamber Side Opening 39 Sub-chamber side opening 4 Partition plate 44 Recessed part 5 Main chamber 51 Second liquid chamber 6 Sub-chamber 7 Diaphragm 9 Upper connecting member 91 Plate 911 Stud bolt 99 Lower connecting member

Claims (3)

[Claims] 1. An upper connecting member attached to the vibrating body side, a lower connecting member attached to the vehicle body side, a vibration-proof rubber body interposed between these upper and lower connecting members for isolating vibrations from the vibrating body, and the lower portion. A tubular metal member having one end coupled to the connecting member and having a tubular shape, an elastic member provided between the upper opening of the tubular metal member and the upper connecting member, and the elastic member. And a main chamber in which an incompressible fluid (liquid) is enclosed, and a diaphragm made of a rubber film member as one chamber wall, and the liquid is enclosed therein. A sub chamber, an orifice connecting the main chamber and the sub chamber, and
In a liquid-filled type vibration damping device comprising a partition plate for partitioning between the main chamber and the sub chamber, the elastic member is made of a heat resistant rubber material, while the vibration damping rubber body is provided in the main chamber. And a vibration-isolating rubber body having a truncated cone shape that is formed so as to spread in a divergent manner from the upper connecting member to the partition plate. 2. The liquid-filled type vibration damping device according to claim 1, wherein the second liquid chamber is formed by a space defined by the vibration damping rubber body and the partition plate, and further the vibration damping is performed. A liquid-filled type vibration damping device, characterized in that a second orifice for communicating between the main chamber and the second liquid chamber is provided in a part of the rubber body. 3. The liquid-filled type vibration damping device according to claim 1, wherein the vibration damping rubber body has a structure having an inner cylinder and an outer cylinder, and the inner cylinder serves as the upper connecting member. The orifice is formed by the outer peripheral surface of the outer cylinder and the inner peripheral surface of the tubular metal fitting or the upper surface of the partition plate, which is one of the surfaces. Liquid-filled anti-vibration device.