JPH09151983A - Fluid-sealed type cylindrical mount - Google Patents

Abstract

PROBLEM TO BE SOLVED: To vibrate an equilibrium chamber while sufficiently ensuring the deformation freedom of a thin rubber film forming the wall part of the equilibrium chamber to improve the vibration controlling effect based on the flowing action of a fluid in a fluid sealed type cylindrical mount having a pressure receiving chamber and the equilibrium chamber which are allowed to mutually communicate by an orifice passage. SOLUTION: The central part of a thin rubber film 34 is connected to a shaft member 12 side by a connecting rubber 46, a rib-like reinforcing rubber 48 protruded into an equilibrium chamber 52 is integrally formed on the thin rubber film 34, and the displacement of the shaft member 12 is extended to the thin rubber film 34 while ensuring the durability of the thin rubber film 34 by the synergy of the connecting rubber 46 and the reinforcing rubber 48 to efficiently generate a fluid flow, whereby the mount vibration controlling performance is improved.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a fluid-filled tubular mount suitable for use in automobile engine mounts, differential mounts, member mounts, bushes, and the like, and more particularly to fluid flow action against input vibration in the direction perpendicular to the axis. The present invention relates to a fluid-filled cylindrical mount having an improved structure in which a vibration damping effect based on the above is more effectively exhibited.

[0002]

BACKGROUND ART Conventionally, a shaft metal fitting and an outer metal fitting, which are arranged at a predetermined distance in a radial direction from each other, have been used as a main body rubber elastic body as a vibration isolation connecting body interposed between members constituting a vibration transmitting system. And connect them together, and form a fluid chamber in which an incompressible fluid is enclosed between the shaft metal fittings and the outer cylinder metal fitting, and obtain vibration damping effect by utilizing the flow action such as fluid flow resistance and resonance action. Such a fluid-filled type cylindrical mount is known. And, as a kind thereof, in Japanese Patent Publication No. 30736/1993, a slit penetrating in the axial direction between a shaft metal fitting and an outer tubular metal fitting is formed over substantially half a circumferential direction, while a bottom is formed by a rubber elastic body. Position the first pocket part with the wall part and the second pocket part with the bottom wall part with the thin rubber film located in the slit on both sides of the shaft member in the direction perpendicular to the axis. Then, it is formed so as to open on the outer peripheral surface of the main body rubber elastic body, and the first and second pockets are filled with an incompressible fluid such as water and covered with an outer tubular metal member, so that the main body rubber is The pressure receiving chamber to which vibration is input based on the elastic deformation of the elastic body, and the equilibrium chamber in which the volume change is allowed based on the elastic deformation of the thin rubber film are formed, and the orifice passage that connects the pressure receiving chamber and the equilibrium chamber is formed. Opening the structure with It is.

In such a tubular mount, even if a supporting load is exerted between the shaft member and the outer tubular member during mounting, the slit prevents the occurrence of a large tensile stress in the rubber elastic body and the rubber elastic body. The durability of the body is ensured, and the equilibrium chamber prevents the fluid pressure from significantly increasing, so that the vibration damping effect based on the fluid flow action is stably exhibited. For example, the load of the power unit is exerted at the time of mounting. It is preferably used as an engine mount for FF type automobiles.

Further, in recent years, more excellent anti-vibration performance has been required along with the sophistication of automobiles and the like, and in order to cope with it, for example, the actual Kaihei 2-7624.
In Japanese Patent No. 0, etc., a thin rubber film forming the bottom wall of the second pocket is partially connected to the shaft fitting side, and vibration is also input to the equilibrium chamber to cause a forced volume change. As a result, it is disclosed that the vibration damping effect exerted based on the flow action of the fluid flowing between the pressure receiving chamber and the equilibrium chamber through the orifice passage is improved.

However, as a result of further study by the present inventors, when the thin rubber film is partially connected to the shaft fitting side, a large stress locally acts on the connecting portion of the thin rubber film. It was revealed that the durability of the thin rubber film is likely to deteriorate. In order to secure the durability of the thin rubber film, it is possible to make the thin rubber film thicker,
If so, the degree of freedom of deformation of the thin rubber film, that is, the volume variability of the equilibrium chamber is reduced, making it difficult to obtain the desired vibration damping effect, or causing a greater concentration of stress, causing the thin rubber film to move toward the shaft fitting side. This is not an effective solution because cracks and the like are likely to occur at the connecting portion of.

[0006]

The present invention has been made in view of the circumstances as described above, and a problem to be solved is to provide a degree of freedom of deformation of a thin rubber film forming a wall portion of an equilibrium chamber. (EN) Provided is a fluid-filled cylindrical mount having an improved structure capable of inputting vibration to a balance chamber and improving vibration-damping effect based on fluid flow action while ensuring sufficient durability together. It is in.

[0007]

In order to solve such a problem, a feature of the present invention resides in that a shaft member and an outer cylinder member disposed outside the shaft member at a predetermined distance are provided between them. While being connected by the main body rubber elastic body interposed between the shaft member and the outer cylinder member, a slit penetrating in the axial direction between the shaft member and the outer cylinder member is formed over substantially the half circumference, while the main body rubber elastic body forms a bottom wall portion. The first pocket part configured and the second pocket part, the bottom wall part of which is formed by the thin rubber film located in the slit, are positioned on both sides of the shaft member in the direction perpendicular to the axis. By forming the first pocket portion and the second pocket portion with the outer tubular member, the non-compressible fluid is enclosed inside, and vibration is generated based on elastic deformation of the main rubber elastic body. Input pressure chamber and thin rubber In the fluid-filled cylindrical mount, which forms an equilibrium chamber in which the volume change is allowed based on the elastic deformation of, and which further has an orifice passage communicating between the pressure receiving chamber and the equilibrium chamber, A connecting rubber that connects the central portion of the thin rubber film that constitutes the bottom wall portion to the shaft member side is provided in the slit, and a rib shape that protrudes toward the inner surface side of the second pocket portion with respect to the thin rubber film. It is because the reinforcing rubber of is integrally formed.

In the fluid-filled cylindrical mount having the structure according to the present invention, the vibration of the shaft member is transmitted to the thin rubber film via the connecting rubber when the vibration is input, so that the vibration is generated in the equilibrium chamber. Since the volume is input and causes a forced volume change, it is possible to improve the vibration damping effect that is exerted based on the flow action of the fluid that is caused to flow between the pressure receiving chamber and the equilibrium chamber through the orifice passage. Moreover, since the rib-shaped reinforcing rubber is formed on the inner surface side of the thin rubber film, the durability of the thin rubber film can be advantageously ensured while sufficiently ensuring the flexibility of elastic deformation of the entire thin rubber film. You can

In short, according to the present invention, since the connecting rubber and the reinforcing rubber are provided together on the thin rubber film, the synergistic action of the connecting rubber and the reinforcing rubber causes
While securing the mount durability, the effect of improving the vibration damping performance could be achieved advantageously.

Further, since the reinforcing rubber in the thin rubber film is formed so as to project to the inside of the equilibrium chamber, the contact of the reinforcing rubber with the main rubber elastic body side does not pose a problem, Furthermore, since it is rib-shaped, there is no problem such as a decrease in the volume of the equilibrium chamber.

In the present invention, the thin rubber film and the connecting rubber may be formed separately from the main rubber elastic body, but in manufacturing, it is advantageously formed integrally with the main rubber elastic body. The rubber film is connected to the main rubber elastic body via a connecting rubber.

Further, in the present invention, the number and the specific shape of the connecting rubber and the reinforcing rubber are not particularly limited, but in a preferred embodiment of the present invention, as described in claim 2, thin wall At least a part of the connecting rubber and the reinforcing rubber provided on both surfaces of the rubber film are formed at corresponding positions on both surfaces of the thin rubber film, that is, at the same position on the thin rubber film.

By adopting such a relative positional relationship between the connecting rubber and the reinforcing rubber, the reinforcing effect of the thin rubber film by the reinforcing rubber can be more effectively exerted, and good durability can be improved.

Further, in the present invention, the connecting rubber and the reinforcing rubber provided on both sides of the thin rubber film may be formed in parallel with each other or obliquely intersecting with each other, but a preferred embodiment of the present invention. In the third aspect, as described in claim 3, the connecting rubber and the reinforcing rubber are formed in a state of extending in directions substantially orthogonal to each other.

If such a relative positional relationship between the connecting rubber and the reinforcing rubber is adopted, the stress input to the thin rubber film via the connecting rubber can be transmitted to a wider range, and the thin rubber film can be formed. The generated stress is effectively dispersed, and thereby the durability of the thin rubber film can be more advantageously improved.

Furthermore, in a preferred aspect of the present invention, as set forth in claim 4, the protruding height of the reinforcing rubber gradually decreases from the central portion of the second pocket portion toward the peripheral portion thereof. Formed with.

If such a shape of the reinforcing rubber is adopted,
The stress input to the thin rubber film via the connecting rubber is applied almost uniformly over a wide range of the thin rubber film, which effectively prevents local deformation of the thin rubber film. Durability can be improved more effectively.

Further, in a preferred aspect of the present invention, as described in claim 5, a bent portion bent in a fold shape is provided at an opening edge portion of the second pocket portion in the thin rubber film. Thus, the volume of the equilibrium chamber is increased by the elastic elastic deformation of the bent portion.

If such a structure is adopted, the volume change amount of the equilibrium chamber can be more advantageously ensured by the elastic expansion of the bent portion, and the bent portion is separated from the connecting rubber. Since it is provided at the opening edge of the second pocket, stress concentration on the bent portion is prevented,
There is also an advantage that the stress input to the thin rubber film through the connecting rubber is spread over a wide range of the thin rubber film.

In a preferred embodiment of the present invention,
As described in claim 6, an intermediate sleeve having a first window portion and a second window portion formed facing each other in one direction perpendicular to the axis is vulcanized to the outer peripheral portion of the main rubber elastic body. The first pocket portion and the second pocket portion are adhered to each other to open the first pocket portion and the second pocket portion through the first window portion and the second window portion, while the first pocket portion and the second pocket portion are axially laid across the central portion in the circumferential direction of the second window portion. A connecting portion that connects both edge portions of the second window portion is provided, and the connecting portion is positioned so as to face the shaft member with the slit interposed therebetween, whereby the relative displacement of the shaft member and the outer cylinder member in the direction perpendicular to the axis. The thin rubber that constitutes a stopper mechanism for limiting the amount and that divides the second pocket portion into substantially two sides in the circumferential direction by the connecting portion to form the bottom wall portion of each of the second pocket portions. A connecting rubber and a reinforcing rubber are installed on the membrane. It is.

If such a structure is adopted, the effect of improving vibration damping performance and durability according to the present invention, which is based on the synergistic action of the connecting rubber and the reinforcing rubber, can be sufficiently ensured, and at the same time, the shaft member and the outer cylinder member can be improved. The stopper mechanism for limiting the relative displacement in the direction orthogonal to the axis can be advantageously realized without increasing the number of special members.

[0022]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, in order to clarify the present invention more specifically, embodiments of the present invention will be described in detail with reference to the drawings.

First, FIGS. 1 and 2 show an FF type automobile engine mount 10 as a first embodiment of the present invention.
It is shown. Engine mount 10 of this embodiment
Is a main body rubber elastic body 16 in which an inner tubular metal member 12 as a shaft member and an outer tubular metal member 14 as an outer tubular member are arranged eccentrically with respect to each other by a predetermined amount, and are interposed between the inner and outer tubular metal members 12, 14. Has a structure elastically connected by.
In this engine mount 10, the inner tubular metal fitting 12 and the outer tubular metal fitting 14 are attached to either one of a body side and a power unit side, which are not shown, so that the engine mount 10 is interposed between the power unit and the body, and the power unit is mounted. It is designed to support the body against vibration. In such a mounted state, the weight of the power unit is exerted in a substantially vertical direction in the figure,
The main rubber elastic body 16 is elastically deformed and the inner and outer cylindrical metal fittings 12, 1
4 is positioned on substantially the same axis, and the main vibration load to be vibration-isolated is input in the substantially eccentric direction of the inner and outer cylindrical metal fittings 12 and 14 (vertical direction in the drawing).

More specifically, the inner cylindrical metal member 12 has a thick-walled cylindrical shape, and a metal sleeve 1 serving as an intermediate sleeve having a thin-walled large-diameter cylindrical shape radially outward thereof.
8 are eccentrically arranged by a predetermined amount. The metal sleeve 18 is provided with a first window portion 20 and a second window portion 22 at positions radially opposite to each other, and the first window portion 20 and the second window portion 22 are The inner tubular member 12 is positioned so as to be located on both sides in the eccentric direction with respect to the inner tubular member 12.

Further, at the central portion in the circumferential direction of the second window portion 22 of the metal sleeve 18, a gate-shaped connecting fitting 24 extending in the axial direction straddling between both edge portions of the opening of the second window portion 22.
Are assembled from the inner peripheral side of the metal sleeve 18, fixed to both edge portions of the opening of the metal sleeve 18, and attached so as to project inward in the radial direction of the metal sleeve 18. The connecting metal fitting 24 is positioned to face the inner metal fitting 12 at a predetermined distance in the eccentric direction of the inner metal fitting 12 and the metal sleeve 18. Further, the second window portion 22 is substantially bisected by the connecting metal fitting 24 to form a pair of split windows located on both sides in the circumferential direction with the connecting metal fitting 24 interposed therebetween.

Further, the inner tubular metal member 12 and the metal sleeve 18
The main body rubber elastic body 16 is disposed between the inner tubular metal fittings 1
2 and the metal sleeve 18 are vulcanized and adhered, and the main body rubber elastic body 16 elastically connects the inner tubular metal member 12 and the metal sleeve 18. Here, between the inner cylindrical metal member 12 and the metal sleeve 18, the side having a smaller separation distance in the eccentric direction (the lower side in the drawing) extends in a circumferential direction over substantially a half circumference, and has an axial direction. There is provided a slit 28 penetrating the main rubber elastic body 16 between the inner cylindrical metal member 12 and the metal sleeve 18 on the side where the separation distance between them is substantially large in the eccentric direction ( It is arranged only on the upper side in the figure).

Further, the main rubber elastic body 16 is formed with a first pocket portion 30 opening on the outer peripheral surface on the side where the distance between the inner cylindrical metal member 12 and the metal sleeve 18 in the eccentric direction is large. , This first pocket 30
Is opened to the outer peripheral surface of the metal sleeve 18 through the first window portion 20 of the metal sleeve 18. Furthermore,
In the first pocket portion 30, a stopper fitting 32 fixed to the inner tubular fitting 12 is located at a predetermined height from the center of the bottom portion.

On the other hand, the metal sleeve 18 is provided with a pair of bag-shaped thin rubber films 34, 34 at its opening.
The second pocket portions 31 and 31 that are vulcanized and bonded to the peripheral edge portions (the metal sleeve 18 and the coupling fitting 24) of the split windows in the second window portion 22 are opened to the outer peripheral surface through the split windows, respectively. Are formed. In addition,
In this embodiment, both thin rubber films 34, 34 are integrally formed with the main rubber elastic body 16.

The thin rubber film 34 has a relatively small thickness so that elastic deformation is easily permitted. Further, in particular, in each thin rubber film 34, the opening edge portion on the side of the coupling fitting 24 is a bent portion 44 that is curved in a fold shape with a U-shaped cross section protruding outward,
In the bent portion 44, the elastic deformation in the expanding direction of the bent portion 44 is relatively easily permitted, so that the volume change amount of the second pocket portion 31 is sufficiently secured. There is. In this embodiment, a communication groove 36 extending in the circumferential direction is provided on the outer peripheral surface of the connecting fitting 24, and the communication groove 36 allows the second pocket portions 31, 3 to be formed.
By communicating 1 with each other, the second pocket 3
1, 31 are substantially single pockets.

The outer peripheral surface of the metal sleeve 18 is substantially entirely covered with a seal rubber layer 38 integrally formed with the main rubber elastic body 16, and the axial center portion of the metal sleeve 18 is covered. Recesses 40, 40 that open in the outer peripheral surface and extend in the circumferential direction are formed so as to straddle the circumferential end edges of the openings of the first window 20 and the second window 22. . A circumferential groove 42 that extends in the circumferential direction and connects the first pocket portion 30 and the second pocket portions 31, 31 to each other is formed by the one recess 40. The other recess 40 is filled with the seal rubber layer 38 and is substantially disappeared.

Further, the thin rubber films 34 forming the second pocket portions 31, 31 are connected to each other by a connecting rubber 46 at a portion of the slit 28 facing the main rubber elastic body 16.
Is connected to the main rubber elastic body 16.
That is, the connecting rubber 46 straddles the central outer surface of the bottom wall portion of the second pocket 31 formed by the thin rubber film 34 and the facing surface of the main rubber elastic body 16, and the thin rubber film 34. The main elastic body 16 is integrally formed with the main body rubber elastic body 16, so that the displacement of the inner tubular member 12 is exerted on the thin rubber film 34 via the connecting rubber 46.

Furthermore, a rib-shaped reinforcing rubber 48 protruding into the second pocket portion is integrally formed on each thin rubber film 34 on the inner surface side of the second pocket portion 31.

In particular, in this embodiment, as shown in FIG. 3, the connecting rubber 46 is used as the second pocket portion 3.
In the central portion in the circumferential direction of the bottom wall portion of No. 1, only one line is formed with a narrow wall shape that extends linearly over substantially the entire length of the bottom wall portion in the axial direction.
However, in the axial center portion of the bottom wall portion of the second pocket portion 31, only one strip is formed with a narrow rib shape that extends linearly over substantially the entire circumferential length of the bottom wall portion. As a result, the connecting rubber 46 and the reinforcing rubber 48 formed on the front and back surfaces of the thin rubber film 34 are formed in the central portion of the thin rubber film 34 in positions that are substantially orthogonal to each other on the front and back of the thin rubber film 34. There is. Further, the reinforcing rubber 48 in the present embodiment has the highest protruding height at the center of the bottom wall of the second pocket 31 to which the connecting rubber 46 is connected, and gradually increases toward the peripheral portion of the second pocket 31. It is shaped to be lower. Note that FIG. 3 shows the main rubber elastic body 16 in a state of a vulcanized molded product.

In the integrally vulcanized molded product having such a structure, the metal sleeve 18 is reduced in diameter as necessary to pre-compress the main rubber elastic body 16, and then the outer cylindrical metal fitting 14
Is extrapolated and is fitted to the metal sleeve 18 by drawing. As a result, the first window portion 20 and the second window portion 22 are closed by the outer tubular metal fitting 14, and the first pocket portion 3
The pressure receiving chamber 50 and the equilibrium chamber 52, in which a predetermined incompressible fluid is enclosed, are formed by the 0 and the second pocket portions 31, 31, and the circumferential groove 42 is formed in the outer tubular metal fitting 14.
An orifice passage 54 is formed to cover the pressure receiving chamber 50 and the equilibrium chamber 52 with each other. As the enclosed fluid, water, alkylene glycol, polyalkylene glycol, silicone oil or the like is generally preferably used in order to effectively obtain the vibration damping effect due to the flow action of the fluid. Further, the filling of the fluid can be advantageously carried out, for example, by mounting the outer tubular metal fitting 14 on the integrally vulcanized molded article in a non-compressible fluid.

In the pressure receiving chamber 50, a part of the wall portion is constituted by the main rubber elastic body 16, and the inner and outer cylindrical metal fittings 12,
When a vibration is input between the fourteen, the vibration is input based on the elastic deformation of the main rubber elastic body 16 to cause the internal pressure fluctuation. On the other hand, in the equilibrium chamber 52, a part of the wall portion of the balance chamber 52 is made of thin rubber. The thin rubber films 34, 34 are constituted by the films 34, 34, and the volume change is allowed on the basis of the elastic deformation of the thin rubber films 34, 34. Therefore, it is obtained as described above. In the engine mount 10, when vibration is input between the inner and outer cylindrical metal fittings 12 and 14, the internal pressure difference between the pressure receiving chamber 50 and the equilibrium chamber 52 is generated between the two chambers 50 and 52. Therefore, the fluid flow is generated through the orifice passage 54, so that a predetermined vibration isolation effect is exhibited based on the fluid flow action.

Here, particularly in the engine mount 10, the thin rubber films 34, 34 forming the wall portion of the equilibrium chamber 52 are connected to the inner cylindrical metal fitting 12 side via the connecting rubber 46. Therefore, when the vibration is input, the displacement of the inner tubular member 12 is changed by the thin rubber film 34 through the connecting rubber 46.
As a result, the vibration is input to the equilibrium chamber 52 as well, whereby the efficiency of fluid flow through the orifice passage 54 is improved, and the vibration isolation effect based on the fluid flow action is more effectively exhibited. It will be.

That is, when vibration is input between the inner and outer tubular fittings 12 and 14, the pressure receiving chamber 50 is mainly responsive to fluctuations in the internal pressure of the pressure receiving chamber 50 due to elastic deformation of the main rubber elastic body 16.
A fluid flow is generated through the orifice passage 54 between the equilibrium chamber 52 and the equilibrium chamber 52. However, vibration is also input to the equilibrium chamber 52 via the connecting rubber 46, and a volume change substantially opposite to that in the pressure receiving chamber 50 occurs. Because it is generated, the orifice passage 5
The fluid flow through 4 is generated more actively,
The anti-vibration effect based on the fluid flow action is more effectively exhibited.

Further, after the inner cylindrical metal member 12 is maximally displaced to the pressure receiving chamber 50 side or the equilibrium chamber 52 side, the volume of the equilibrium chamber 52 is further increased or increased based on the phase difference between the input vibration and the fluid flow. Since the decrease is suppressed by the stress transmission from the inner tubular metal fitting 12 side to the thin rubber film 34 via the connecting rubber 46, an effective damping effect is exerted particularly for large-amplitude vibration.

Moreover, the force input to the thin rubber film 34 via the connecting rubber 46 is advantageously transmitted by the reinforcing rubber 48 over a wide range of the thin rubber film 34. The effect of improving the vibration isolation performance by transmitting the force to the rubber film 34 is more effectively exhibited.

In particular, in this embodiment, the thin rubber film 3 is used.
4, the connecting rubber 46 and the reinforcing rubber 48 are formed so as to be orthogonal to each other, and the reinforcing rubber 48
Since the projecting height of is reduced toward the end, the force transmission to the thin rubber film 34 can be made substantially uniform over a wider range. The force can be more efficiently transmitted from the inner tubular metal fitting 12 side to the thin rubber film 34, and as described above, the effect of improving the vibration isolation performance by transmitting the force to the thin rubber film 34 is more effective. It is demonstrated to.

Further, in the engine mount 10, the connecting rubber 46 and the reinforcing rubber 48 are formed on a part of the thin rubber film 34, and the connecting rubber 46 and the reinforcing rubber 48 disperse the stress to reduce the thin wall. Rubber film 3
Since local stress concentration in 4 is reduced or eliminated, it is advantageous to improve the durability of the thin rubber film 34 while ensuring the volume variability of the equilibrium chamber 52 based on the deformation of the thin rubber film 34. Be done.

Particularly, in this embodiment, the thin rubber film 3 is used.
The bent portion 44 provided at the edge of the No. 4 avoids the occurrence of a large stress in the thin rubber film 34, and the equilibrium chamber 52
Since a large amount of variable volume is secured, the durability of the thin rubber film 34 can be improved more effectively.

In addition, in the engine mount 10, as described above, the thin rubber film 34 is provided from the inner tubular metal fitting 12 side.
After the inner tubular fitting 12 is maximally displaced to the pressure receiving chamber 50 side or the equilibrium chamber 52 side by the stress transmission via the connecting rubber 46 to the equilibrium chamber 52 based on the phase difference between the input vibration and the fluid flow. Since the further increase or the decrease in the volume is suppressed, the maximum deformation amount of the thin rubber film 34 is suppressed, and the inner tubular metal fitting 12 is displaced to the pressure receiving chamber 50 side and then to the equilibrium chamber 52 side. When doing
The main rubber elastic body 16 is prevented from contacting the bulging thin rubber film 34, and the thin rubber film 34 is prevented from being damaged due to such large deformation or contact with the main rubber elastic body 16. Thus, further improvement in durability is achieved.

Further, in this embodiment, when an excessive vibration load is input between the inner and outer tubular metal fittings 12 and 14, the stopper metal fitting 32 comes into contact with the outer tubular metal fitting 14 and the connecting metal fitting 2 is provided.
Since the contact of 4 with the inner tubular fitting 12 limits the relative displacement of the inner and outer tubular fittings 12, 14,
Excessive bulging deformation of the thin rubber film 34 due to excessive relative displacement of the inner and outer tubular fittings 12 and 14 can be completely prevented.

Further, in the present embodiment, the wall portion of the equilibrium chamber 52 has two thin rubber films 34,
Since the thin rubber films 34 and 34 are connected to the inner tubular metal fitting 12 side via the connecting rubber 46, the wall portion of the equilibrium chamber 52 is formed into a single thin wall film. As compared with the case where the thin rubber film 34 is composed of a rubber film and is connected to the inner tubular metal member 12 side by a single connecting rubber, stress concentration in the thin rubber film 34 is advantageously reduced, and a more excellent durability improving effect is obtained. It will be demonstrated.

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

For example, the number and the specific shape of the connecting rubber 46 and the reinforcing rubber 48 provided on the thin rubber film 34 forming the wall of the equilibrium chamber are not limited at all, and various structures are adopted. obtain.

Also, when each one of the connecting rubbers 46 and the reinforcing rubbers 48 extending in a straight line shape is adopted in the thin rubber film 34 as in the first embodiment, their forming directions are not limited. Not a thing. Specific examples thereof are shown in FIGS. In addition, in these drawings, in order to facilitate understanding, the same reference numerals as those in the first embodiment are used for the members and parts having the same structures as those in the first embodiment. Is attached.

That is, as shown in FIGS. 4 and 5, the connecting rubber 46 is formed in a linear shape in which the central portion of the thin rubber film 34 extends for a predetermined length in the mount circumferential direction. The reinforcing rubber 48 is formed in a linear shape extending in the mount axial direction at the mount circumferential direction central portion of the thin rubber film, and the connecting rubbers 46 are formed.
The reinforcing rubber 48 may be positioned so as to be substantially orthogonal to the front and back of the thin rubber film 34.

Further, as shown in FIGS. 6 and 7, the connecting rubber 46 is formed in a linear shape in which the central portion of the thin rubber film 34 extends for a predetermined length in the mount axis direction. By forming the reinforcing rubber 48 in a linear shape extending in the mount circumferential direction central portion of the thin rubber film, the connecting rubber 46 and the reinforcing rubber 48 are substantially the same on the front and back of the thin rubber film 34. You may form in a position.

Alternatively, as shown in FIGS. 8 and 9, the connecting rubber 46 is formed in a linear shape in which the central portion of the thin rubber film 34 extends for a predetermined length in the mount circumferential direction. By forming the reinforcing rubber 48 in a linear shape in which the central portion of the thin rubber film in the mount axial direction extends in the mount circumferential direction, the connecting rubber 46 and the reinforcing rubber 48 are substantially formed on the front and back sides of the thin rubber film 34. They may be formed at the same position.

Further, the structure such as the length of the orifice passage 54 is appropriately determined according to the anti-vibration characteristics required for the mount, and is not limited to the above embodiment.

Furthermore, in the above embodiment, the equilibrium chamber 52 is composed of two thin rubber films 34, 34, but the equilibrium chamber may be formed of a single thin rubber film.

It is also possible to form a plurality of independent equilibrium chambers, each of which is connected to the pressure receiving chamber via the orifice passage.

In addition, it goes without saying that the present invention is applicable to not only engine mounts for automobiles but also differential mounts, body mounts, bushes, etc., or cylindrical mounts in various devices other than automobiles. Is.

In addition, although not enumerated one by one, the present invention
Based on the knowledge of those skilled in the art, various changes, modifications, improvements, and the like can be made, and unless such embodiments depart from the spirit of the present invention.
Both are included within the scope of the present invention,
Needless to say.

[0057]

As is apparent from the above description, in the fluid-filled cylindrical mount having the structure according to the present invention, the connecting rubber and the reinforcing rubber are provided to the thin rubber film forming the wall of the equilibrium chamber. By providing it together, local stress concentration in the thin rubber film can be avoided and the displacement of the shaft member can be advantageously transmitted over a wide range of the thin rubber film to positively change the volume of the equilibrium chamber. Therefore, it is possible to improve the mount antivibration performance by improving the efficiency of fluid flow through the orifice passage while securing the mount durability.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view showing an engine mount as an embodiment of the present invention.

FIG. 2 is a sectional view taken along the line II-II in FIG.

3 is a cross-sectional view of a main part of a vulcanized molded product corresponding to the III-III cross section in FIG.

FIG. 4 is a cross-sectional view corresponding to FIG. 1, showing an engine mount as another embodiment of the present invention.

5 is a cross-sectional view of the main part of the vulcanized molded product corresponding to FIG. 3, corresponding to the VV cross section in FIG. 4.

FIG. 6 is a transverse sectional view corresponding to FIG. 1, showing an engine mount as still another embodiment of the present invention.

7 is a cross-sectional view taken along line VII-VII in FIG.
FIG. 3 is a cross-sectional view of a main part of a vulcanized molded product corresponding to FIG.

FIG. 8 is a cross-sectional view corresponding to FIG. 1, showing an engine mount as still another embodiment of the present invention.

9 is a cross-sectional view of a main part of the vulcanized molded product corresponding to FIG. 3, corresponding to the IX-IX cross section in FIG. 8.

[Explanation of symbols]

 10 Engine Mount 12 Inner Tube Metal Fitting 14 Outer Tube Metal Fitting 16 Main Body Rubber Elastic Body 20 First Window Part 22 Second Window Part 28 Slit 30 First Pocket Part 31 Second Pocket Part 34 Thin Rubber Membrane 46 Connection Rubber 48 Reinforcement rubber 50 Pressure receiving chamber 52 Equilibrium chamber 54 Orifice passage

Claims (6)

[Claims] 1. A shaft member and an outer cylinder member disposed outside the shaft member at a predetermined distance from each other are connected by a main rubber elastic body interposed therebetween, and the shaft member and A slit penetrating axially between the outer cylinder members is formed over substantially a half circumference, and a first pocket portion having a bottom wall portion formed by the main rubber elastic body, and a position inside the slit. A second pocket portion whose bottom wall portion is formed of a thin rubber film is formed so as to be located on both sides of the shaft member in a direction perpendicular to the axis, and the first pocket portion and the second pocket portion are formed. By covering the pocket portion of the casing with the outer cylinder member, a non-compressible fluid is sealed inside, and a pressure-receiving chamber to which vibration is input based on elastic deformation of the main rubber elastic body, and the thin rubber film. Volume change is allowed based on elastic deformation of A thin rubber film forming a bottom wall portion of the second pocket portion in a fluid-filled cylindrical mount that forms an equilibrium chamber, and further has an orifice passage that connects the pressure receiving chamber and the equilibrium chamber to each other. A connecting rubber that connects the central portion of the second pocket portion to the shaft member side is provided in the slit, and a rib-like reinforcing rubber protruding toward the inner surface side of the second pocket portion is integrally formed with the thin rubber film. A fluid-filled cylindrical mount characterized by the above. 2. The connecting rubber and the reinforcing rubber provided on both surfaces of the thin rubber film are at least partially formed,
The fluid-filled cylindrical mount according to claim 1, wherein the thin rubber film is formed at corresponding positions on both sides of the thin rubber film. 3. The fluid-filled cylindrical mount according to claim 1, wherein the connecting rubber and the reinforcing rubber provided on both surfaces of the thin rubber film are formed in directions substantially orthogonal to each other. 4. The fluid filled cylinder according to claim 1, wherein the protruding height of the reinforcing rubber is gradually lowered from the central portion of the second pocket portion toward the peripheral portion thereof. mount. 5. A bent portion bent in a fold shape is provided at an opening edge portion of the second pocket portion in the thin rubber film, and the balance chamber of the equilibrium chamber is expanded by elastically deforming the bent portion. The fluid-filled cylindrical mount according to any one of claims 1 to 4, wherein the volume is increased. 6. An intermediate sleeve is vulcanized and adhered to an outer peripheral portion of the main rubber elastic body, and the intermediate sleeve is positioned to face in one direction in a direction perpendicular to an axis of the intermediate sleeve. A first window portion and a second window portion are formed in which the pocket portions are opened, and both edges of the second window portion straddle the central portion in the circumferential direction of the second window portion in the axial direction. A connecting portion that connects the portions is provided, and the connecting portion is positioned to face the shaft member with the slit interposed therebetween, thereby limiting the relative displacement amount of the shaft member and the outer cylinder member in the direction perpendicular to the axis. While the stopper mechanism is configured, the second pocket portion is substantially bisected on both sides in the circumferential direction by the connecting portion, and the thin rubber film forming the bottom wall portion of each of the second pocket portions. To the connection rubber and The fluid-filled tubular mount according to any one of claims 1 to 5, further comprising: