JPH1096449A - Liquid-sealed vibration control device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To bring the spring characteristics of a membrane part into a nonlinear state. SOLUTION: An almost closed space in a housing 4 is partition by a diaphragm 5 to form a liquid chamber, which is further partitioned into first and second chambers 7 and 8 by a rubber partition wall 6, the first and second chambers being intercommunicated through an orifice passage 9. The intermediate part of the rubber partition wall 6 forms a membrane part 11 a part of which forms a press part 12. When the membrane part 11 is bent and deformed to a position below a figure, the press part 12 is formed such that the tip thereof is pressed against a partition wall support member 14 and deformed, whereby a repulsion force due to deformation is changed into a nonlinear state with the progress of deformation of the membrane part 11 and as a result, the spring characteristics of the membrane part 11 are brought into a nonlinear state.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a liquid seal vibration isolator such as a suspension mount rubber or an engine mount rubber of an automobile, and more particularly to a device capable of exhibiting non-linear characteristics.

[0002]

2. Description of the Related Art As an example of such a liquid-sealed vibration isolator,
Japanese Patent Application Laid-Open No. 64-1566 discloses a first bracket attached to a vehicle body, a second bracket attached to a vibration member, a rubber portion provided between these two members, and a liquid provided in the rubber portion. Chamber, and a rubber partition wall for dividing the liquid chamber into two chambers. The rubber partition wall has an orifice portion communicating the two liquid chambers and a membrane portion formed by thinning the central portion. An integrally formed one is shown.

[0003]

A desirable performance of such a liquid-vibration isolator is a low dynamic spring for effectively absorbing a high-frequency small-amplitude input (hereinafter referred to as small vibration) such as engine vibration. Characteristics, low-frequency low-amplitude input such as shake vibration caused by tire imbalance, and low-frequency high-amplitude vibration such as vibration input from the suspension due to uneven road surface (hereinafter referred to as large vibration) It is a high damping characteristic for obtaining sufficient damping at the time of input and a low dynamic spring high damping performance capable of exhibiting both performances.

By the way, in the above-mentioned conventional device, a low dynamic spring state can be obtained by reducing the spring constant of the membrane portion. However, if this state is maintained, when a large vibration is input, the elastic deformation of the membrane portion increases proportionally. Therefore, a sufficiently high attenuation cannot be obtained. For this reason, in practice, it is necessary to provide a deformation restricting portion for restricting the deformation beyond a predetermined stroke in the membrane portion.

[0005] However, in this case, the deformation of the membrane portion is restricted, and a sudden damping force is generated at the same time, so that each time the occupant feels a shock, the ride comfort may be impaired. In addition, since a tapping sound is generated each time the membrane portion comes into contact with the deformation restricting portion, it may become a noise source.

Further, such a stepwise change in the spring constant in the membrane portion means that the resonance frequency in the orifice portion also changes in a stepwise manner. As a result, the optimum resonance in the entire region requiring damping is obtained. It becomes difficult to maintain the frequency. In addition, the number of parts is increased due to the necessity of the deformation restricting part in the structure. The present application solves these problems.

[0007]

According to a first aspect of the present invention, there is provided a liquid ring vibration isolator according to the first aspect, comprising: a first connecting member attached to one of a vehicle body and a vibration member;
A second connecting member attached to the other, an elastic body provided between these two members, a liquid chamber provided between the elastic body and a wall formed by the first or second connecting member, This liquid chamber is divided into two chambers, and
Alternatively, in a liquid ring vibration isolator provided with a partition wall fixed to one side of the second connecting member and an orifice connecting two liquid chambers defined by the partition wall, the partition wall has an input. A membrane portion that allows elastic deformation by a change in the liquid pressure in the liquid chamber that changes in response to vibration; and a partition wall fixed to the first or second connecting member when the membrane portion elastically deforms. It is characterized in that a pressing portion that abuts on an immovable portion that is immovable on either side is formed integrally with the membrane portion.

According to a second aspect of the present invention, there is provided a liquid ring vibration isolator.
Wherein the pressing portion is not in contact with the immovable portion when no vibration is input.

According to a third aspect of the present invention, there is provided a liquid ring vibration isolator.
Wherein the pressing portion is always in contact with the immovable portion.

[0010] The liquid-sealed vibration isolator according to claim 4 is based on claim 1.
In any one of the structures described in any one of (1) to (3), the periphery surrounding the partition wall is supported by a partition wall support member fixed to one of the first and second connecting members, and the partition wall support member is supported by the partition wall support member. It is characterized in that the pressing portion is an immovable portion for abutting.

According to a fifth aspect of the present invention, there is provided a liquid ring vibration isolator.
Wherein the partition wall is constituted by a membrane portion and a pressing portion, and an orifice passage is formed in a space surrounded by the partition wall support member.

According to a sixth aspect of the present invention, there is provided a liquid ring vibration isolator.
Any one of the above-described aspects, wherein the membrane portion and the orifice portion are formed of materials having different characteristics, and the membrane portion and the orifice portion are combined to form a partition wall.

According to a seventh aspect of the present invention, there is provided a liquid ring vibration isolator.
In any one of the structures (1) to (3), the partition wall is provided with a membrane portion and an orifice portion formed integrally.

The liquid ring vibration isolator according to the eighth aspect is the sixth aspect.
Or 7 is characterized in that the thickness of the membrane portion is made thinner than that of the orifice portion.

According to a ninth aspect of the present invention, there is provided a liquid ring vibration isolator.
Or 7 is characterized in that the orifice portion and the orifice portion have a uniform thickness to increase the thickness.

According to a tenth aspect of the present invention, in the liquid ring vibration isolator according to the sixth or seventh aspect, the central portion of the membrane portion is a thick portion, and the portion between the thick portion and the orifice portion is a thin portion. Features.

According to an eleventh aspect of the present invention, in the liquid ring vibration isolator according to the sixth or seventh aspect, a ring groove for fitting the orifice portion is provided in the partition wall support member, and the orifice portion of the partition wall is provided with a ring groove. A groove is provided between the partition wall support member and the orifice portion of the partition wall, and the orifice portion is fitted into a ring groove of the partition wall support member. It is characterized in that it is inserted into a groove formed between the first and second portions.

A liquid seal vibration isolator according to a twelfth aspect is characterized in that, in the eleventh aspect, the pressing portion comes into contact with the inner wall of the partition wall support member.

According to a thirteenth aspect of the present invention, in the liquid ring vibration isolator according to any one of the first to twelfth aspects, a plurality of inclined surfaces having different angles are formed at a tip end of a pressing portion which is a portion contacting the immobile portion. It is characterized by the following.

A liquid seal vibration isolator according to a fourteenth aspect is characterized in that, in any one of the first to thirteenth aspects, an elastic portion is provided at a portion where the pressing portion of the immovable portion abuts.

According to a fifteenth aspect of the present invention, in the liquid ring vibration isolator according to any one of the first to fourteenth aspects, the tip of the pressing portion, which is a portion contacting the immovable portion, extends from a direction orthogonal to the main vibration input direction. It is characterized in that it comes into contact with an immovable part.

In a liquid-sealing vibration isolator according to the present invention, the contact area of the pressing portion abutting on the immovable portion increases in accordance with the increase in the amount of elastic deformation in the membrane portion. It is characterized by the following:

[0023]

According to the first aspect of the present invention, since the partition wall has the membrane portion, even when the orifice passage is apparently closed by resonance, the membrane portion elastically deforms according to the input vibration to absorb the vibration. In addition, rigidity of the whole vibration isolator is prevented. In addition, when the membrane portion is elastically deformed, the pressing portion formed integrally with the membrane portion is pressed against the immovable portion, and the repulsive force of the pressing portion generated at that time changes nonlinearly. The spring constant changes according to the amount of elastic deformation, and a non-linear spring characteristic is obtained. As a result, as the membrane portion deforms, the damping force by the orifice passage can be increased, and the resonance frequency can be easily maintained at an optimum value in the entire region requiring damping.

At this time, if the pressing portion is kept out of contact with the immovable portion in the initial state before the elastic deformation of the membrane portion,
Since the spring constant changes abruptly when the pressing portion comes into contact with the immovable portion with a predetermined amount of elastic deformation, a non-linear spring characteristic having a step-like inflection portion becomes possible.

On the other hand, if the pressing portion is brought into contact with the immovable portion from the initial state of the membrane portion, the change in the spring constant is not a step-like change but a smooth continuous curve and changes non-linearly.

According to the fourth aspect of the present invention, since the immovable portion which the pressing portion abuts is a partition wall support member, it is easy to secure the immovable portion.

According to the fifth aspect of the present invention, the partition wall is formed by the membrane portion and the pressing portion, and the orifice portion is formed by using the partition wall support member, so that the passage sectional area of the orifice passage is more stabilized. Can be done.

According to the sixth aspect of the present invention, by forming the membrane portion and the orifice portion from materials having different characteristics and connecting them by bonding or the like, the molding of each portion can be reduced in size and the dissimilar physical properties can be reduced. It also allows the combination of materials.

According to the seventh aspect of the invention, when the partition wall is formed by integrating the membrane portion and the orifice portion, the partition wall can integrally exhibit the elastic deformation function, the orifice function, and the stopper function. It is easy to form.

According to the eighth aspect of the present invention, when the thickness of the membrane portion is reduced, elastic deformation is facilitated and the spring constant can be reduced.

According to the ninth aspect of the present invention, when the orifice portion is formed to have a uniform thickness and a large thickness, the spring constant can be further increased.

According to the tenth aspect of the present invention, when the central portion is a thick portion and the portion between the thick portion and the orifice portion is a thin portion, the elasticity of the membrane portion is increased and the spring constant is arbitrarily set. It becomes easier to control.

According to the eleventh aspect of the present invention, the orifice portion is fitted into the ring groove of the partition wall support member, and the inner wall of the partition wall support member is formed between the orifice portion and the membrane portion of the partition wall. By putting it in the groove
Since the orifice portion is surrounded by the wall around the ring groove, a change in the passage cross-sectional area due to deformation of the orifice portion can be suppressed.

According to the twelfth aspect of the present invention, the structure for receiving the pressing portion can be easily formed by pressing the pressing portion against the inner wall of the ring groove.

According to the thirteenth aspect of the present invention, if the tip of the pressing portion has a plurality of inclined surfaces having different angles, the spring constant changes according to the elastic deformation of the membrane portion, and multi-stage nonlinear spring characteristics are obtained. be able to.

According to the fourteenth aspect of the present invention, if the elastic portion is provided at a portion of the immovable portion where the pressing portion comes into contact, it is possible to prevent noise when the pressing portion comes into contact.

According to the fifteenth aspect of the present invention, since the tip of the pressing portion abuts on the immovable portion in a direction orthogonal to the main vibration input direction, the pressing portion can be formed in the peripheral portion of the membrane portion, In addition to making it easy to secure fixed parts,
It does not hinder the elastic deformation at the center of the membrane where the elastic deformation is greatest.

According to the sixteenth aspect of the present invention, the contact area of the pressing portion abutting on the immovable portion changes so as to increase as the amount of elastic deformation in the membrane portion increases.
The spring constant of the membrane becomes non-linear.

[0039]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment constructed as an engine mount will be described with reference to FIGS. 1 and 2. FIG. FIG. 2 is an overall sectional view of the engine mount, and FIG. 1 is an enlarged view of a main part thereof. First, in FIG. 2, this engine mount is a first connecting member 1 attached to the engine on the vibration side.
And a second connecting member 2 connected to the vehicle body side are connected via rubber 3. However, the connection relationship between the engine side and the vehicle body side may be reversed.

The first connecting member 1 has a bowl shape opened downward in the figure, and a housing 4 is attached to the opening thereof. A substantially closed space is provided inside the first connecting member 1 and the housing 4. A liquid chamber in which an incompressible liquid is sealed is defined on the rubber 3 side by the diaphragm 5.

The liquid chamber is partitioned by a rubber partition wall 6 into a first chamber 7 on the rubber 3 side and a second chamber 8 below the rubber partition wall 6, and both chambers are orifice portions which are outer peripheral portions of the rubber partition wall 6. 6
The orifices 9 are communicated with each other by an orifice passage 9 formed in the a. The orifice passage 9 is covered with a ring plate 10,
One end communicates with the first chamber 7 through a communication hole 10a formed in a part thereof, and the other end communicates with the second chamber 8 as described later.

The rubber partition wall 6 is composed of an orifice portion 6a in which an orifice passage 9 is formed, a membrane portion 11 in an intermediate portion, and a pressing portion 12 formed on the lower surface thereof.

As is apparent from FIG. 1, the pressing portion 12 is a lip-shaped portion whose front end is separated from the rubber partition wall 6 by a separation groove 13, and in the present embodiment, the front end of the lip is elastic. The leading end of the pressing portion 12 is in contact with the inner wall 14b of the partition wall support member 14 from an initial state where the partition wall supporting member 14 is not deformed.

The inner wall 14b is a specific example of an immovable portion with which the tip of the pressing portion 12 contacts, and the pressing portion 12 is in the main vibration input direction (direction parallel to the central axis of the membrane portion 11). It comes to abut from a direction perpendicular to.

The partition wall support member 14 is a ring-shaped member having a ring groove 14e. The partition wall support member 14 extends along the opposite surface (back surface) of the rubber partition wall 6 in parallel with the ring plate 10, and the ring groove 14e has an orifice portion 6a. The inner peripheral end 14a fits into the separation groove 13 and is bent toward the center in parallel with the ring plate 10.

The tip of the pressing portion 12 is pressed against the partition wall support member 14. When the membrane portion 11 is bent and deformed downward in the drawing, it is pressed against the partition wall support member 14 and deformed. A repulsive force that increases non-linearly with respect to an increase in the deformation amount of the membrane portion 11 is generated, and as a result, the degree of deformation of the membrane portion 11 is regulated.

The partition wall support member 1 fitted with the rubber partition wall 6
Reference numeral 4 denotes a large-diameter portion 4 formed on the opening of the partition wall support member 14 with the ring plate 10 placed on the upper side and the mounting plate 5a formed around the diaphragm 5 on the lower side.
b on the step 4c, and furthermore, the ring plate 10
A state in which an outward flange portion 1a formed at a lower end portion of the first connecting member 1 is overlapped thereon, and the ring plate 10 and a tip of an outer wall 14c of the partition wall support member 14 are overlapped on the flange portion 1a. Then, the front end 4a of the housing 4 is caulked and the whole is fixed.

At this time, by adjusting the degree of caulking of the tip 4a, the ring plate 10 is pressed against the rubber partition wall 6 and the lower part of the ring plate 10, ie, the orifice portion 6a side, is compressed more than the membrane portion 11 side. The formation of the interference 11a is adjusted. However, this interference 11a
May be omitted as shown in another embodiment described later.

FIG. 3 shows a modification of the pressing portion 12.
Tapers 15 and 16 are provided at the tips, and the angles (A, B) are changed to change the degree at which the tips abut against the partition wall support member 14. 11 changes in accordance with the elastic deformation of the elastic member 11 and the manner of the change differs, so that various nonlinear characteristics can be obtained. Even if the thickness of the pressing portion 12 is multi-stepped, similar characteristic changes can be expected.

FIG. 7 explains in detail the structure of the partition wall portion. The ring plate 10 is a donut plate-shaped metal member, and has an orifice communication hole 10a,
A positioning hole 10b is formed.

The rubber partition 6 has a central portion at the membrane portion 11.
The membrane portion 11 is thinner than the orifice portion 6a and is easily elastically deformed. A ring groove 9c, which has a substantially U-shaped cross section and is open upward, is formed substantially all around the upper surface of the orifice portion 6a covered by the ring plate 10.

The orifice passage 9 is formed in a substantially ring shape by the ring groove 9c and the ring plate 10 covering this opening (see FIG. 2). The wide portion 9a formed at one end of the ring groove 9c overlaps the communication hole 10a. Ring groove 9c
Is connected to a through hole 9b extending downward and opening to the rear surface, and the through hole 9b overlaps with the orifice communication hole 14g of the partition wall support member 14.

The partition wall support member 14 is a cup (cu) provided with a ring groove 14e for fitting the orifice portion 6a.
The ring groove 14e is formed of an outer wall 14c, an inner wall 14b, and a bottom 14d which are concentrically arranged at intervals. The membrane portion 11 is inserted into a center hole 14f formed inside the ring groove 14e of the partition wall support member 14. The bottom portion 14d is formed with the orifice communication hole 14g and the positioning hole 14h.
On the other hand, positioning protrusions 6b and 6c are formed on the upper and lower surfaces of the orifice portion 6a of the rubber partition wall 6, respectively.

Therefore, the ring plate 10, the rubber partition wall 6, and the partition wall support member 14 are overlapped with each other,
When the members are integrated, when the positioning protrusions 6b and 6c are fitted into the positioning holes 10b of the ring plate 10 and the positioning holes 14h of the partition wall support member 14, respectively, the wide portion 9 is formed.
a and the communication hole 10a overlap, and at the same time, the through hole 9b overlaps with the orifice communication hole 14g of the partition wall support member 14. Therefore, the first chamber 7 and the second chamber 8 communicate with each other via the orifice passage 9.

FIGS. 4 to 6 are graphs for explaining the spring characteristics of the membrane portion obtained by the liquid ring vibration isolator according to the present invention. FIG. 4 is a graph showing the spring characteristics of the membrane portion, in which the horizontal axis represents the displacement and the vertical axis represents the spring force. FIG. 5 is a graph showing the damping characteristics. The horizontal axis indicates the frequency of the input vibration, and the vertical axis indicates the damping coefficient. FIG. 6 is a graph showing dynamic spring characteristics, in which the horizontal axis represents the frequency of the input vibration and the vertical axis represents the dynamic spring coefficient.

A more non-linear spring characteristic is obtained.
In the case of an engine mount, the damping characteristic in a displacement region where convergence of the engine is required becomes a high damping characteristic as shown in FIG. 5, and in a displacement region where vibration damping (sound and vibration) of the engine is required. As shown in FIG. 6, the dynamic spring characteristic has a low dynamic spring characteristic, and both high attenuation and low dynamic spring can be achieved.

In addition, by making the pressing portion 12 abut on the inner wall 14b from the initial state where the membrane portion 11 is not elastically deformed, the change of the elastic constant of the membrane portion 11 is made a smooth continuous curve without steps. Can be.

Further, since the tip of the pressing portion 12 abuts on the inner wall 14b from a direction perpendicular to the main vibration input direction, the pressing portion 12 can be formed in the peripheral portion of the membrane portion 11, and the immovable portion is secured. And the elastic deformation at the center of the membrane portion where the amount of elastic deformation is largest is not hindered.

In the case of a large input from the suspension, the displacement of the membrane portion 11 can be restricted by the pressing portion 12 to improve the durability. Further, by providing the interference portion 11a at a portion of the membrane portion 11 overlapping with the ring plate 10, it is possible to eliminate the occurrence of a hitting sound by the membrane 11.

Further, as shown in FIG.
The balance between various damping properties and dynamic spring characteristics can be achieved by a combination of the spring constant of 1 and the tapered end of the pressing portion 12.

FIG. 8 shows a main part of the second embodiment. This membrane portion 11 is different from the previous embodiment in that it has a uniform thickness with the orifice portion 6a and that it does not have a step portion which is an interference when the ring plate 10 is put on the orifice portion 6a. .

With the configuration as in this embodiment, the spring constant of the membrane portion 11 can be increased, so that the spring constant can be controlled by adjusting the wall thickness. The other points are the same as those of the previous embodiment. Therefore, the same portions or the same functional portions are denoted by the same reference numerals (the same applies to the following embodiments).

FIG. 9 shows a case where only the central portion of the membrane portion 11 is formed as a thick portion 11b.
A ring-shaped thin portion 11c is formed between the contact portion 12 and the pressing portion 12. This makes it possible to obtain an intermediate spring constant between the first embodiment and the second embodiment. Moreover, the strength of the membrane section 11 can be increased.

The shape of the thick portion 11b is
The spring constant can be arbitrarily changed as shown by d.

FIG. 10 shows an example in which the orifice portion 6a and the membrane portion 11 are formed separately. The orifice portion 6a and the membrane portion 11 are separately formed, and are joined together by bonding or the like at the joining portion 6b.

In this way, the orifice portion 6a and the membrane portion 11 are each reduced in size, so that they can be easily formed. In addition, if a material having different characteristics, for example, a hard material is used only for the orifice portion 6a, Arbitrary combinations having different characteristics, such as prevention of deformation of the passage 9, can be obtained.

FIG. 11 shows a case where the orifice portion is made of metal,
This is an example in which the rubber partition wall 6 includes only the membrane section 11.
In this case, a bead-shaped gripping portion 11e is integrally formed around the membrane portion 11, and this is
0 and the inner peripheral end 1 of the partition wall support member 14
4a.

The outer wall 14c also has an outer flange 14j which is bent horizontally, and is integrated with the outer peripheral side of the ring plate 10 so as to overlap therewith. In this way, the space surrounded by the ring plate 10 and the partition wall support member 14 can be used for the orifice passage 9. In addition, the cross-sectional area of the passage that is not affected by the elastic deformation of the membrane portion 11 can be maintained.

FIG. 12 shows a structure in which the elastic layer 20 is provided on the side surface of the inner wall 14b which is the other side of the contact with the pressing portion 12, so that the noise generated when the tip of the pressing portion 12 comes into contact with the elastic layer 20 is reduced. Can be prevented.

Further, by changing the thickness, material, elasticity, and the like of the elastic layer 20, the deformation of the pressing portion 12 is changed, and as a result, the change in the spring constant of the membrane portion 11 can be controlled.

The constituent material of the elastic body in the present application is as follows.
As long as the molding material is made of rubber or synthetic resin and has a high elasticity, a known material can be appropriately used.

Further, the pressing portion 12 not only comes into contact with the inner wall 14b, but also the bottom portion 14d of the partition wall supporting member 14.
(FIG. 1), or may contact the inner wall surface of the housing 4.

The pressing section 12 is connected to the membrane section 1.
In the initial state in which the elastic member 1 is not elastically deformed, the inner wall 14b is not in contact with the inner wall 14b, and can be set so as to come into contact with the elastic elastic member at a predetermined elastic deformation time. Can be formed into a step-like curved shape.

[0074]

According to the first aspect of the present invention, since the partition wall is provided with the membrane portion, the membrane portion does not lose elasticity even when the orifice passage is apparently closed due to resonance, and elasticity according to input vibration. Absorbs vibration by deformation.

At this time, since the pressing portion formed integrally with the membrane portion comes into contact with the immovable portion, the deformation of the pressing portion gives a non-linear characteristic to the spring characteristic of the membrane portion, thereby controlling the fluid resonance effect. You can do it. Therefore, it is possible to control the damping characteristics in accordance with the input displacement or to achieve both the high damping characteristics at the time of large vibration input and the low dynamic spring characteristics at the time of small vibration input.

In addition, when the pressing portion is brought into contact with the immovable portion from the initial state of the membrane portion, a non-linear characteristic that changes smoothly is obtained. Conversely, if the pressing portion is made non-contact in the initial state, the non-linear characteristic changes stepwise. Since the characteristics can be obtained, it is possible to provide various forms of nonlinear characteristics.

According to the fourth aspect of the present invention, since the immovable portion in contact with the pressing portion is the partition wall support member, it is easy to secure the immovable portion.

According to the fifth aspect of the present invention, since the partition wall is formed by the membrane portion and the pressing portion, and the orifice portion is formed by using the partition wall support member, the passage sectional area of the orifice passage is further stabilized. be able to.

According to the sixth aspect of the present invention, since the membrane portion and the orifice portion are formed of materials having different characteristics, and the two are connected by bonding or the like, the molding of each portion can be reduced in size, and a material having a different physical property can be used. Combination becomes possible.

According to the seventh aspect of the present invention, since the partition wall is formed by integrating the membrane portion and the orifice portion, the partition wall can integrally exhibit the elastic deformation function, the orifice function, and the stopper function, and the structure is further improved. The simplification and the easy formation of the orifice portion have been made possible, and the number of parts can be reduced.

According to the eighth aspect of the present invention, since the thickness of the membrane portion is reduced, elastic deformation is facilitated and the spring constant can be reduced.

According to the ninth aspect of the present invention, the orifice portion and the orifice portion have a uniform thickness and are made thicker, so that the spring constant can be further increased.

According to the tenth aspect of the present invention, the central portion is made to be a thick portion, and the portion between the thick portion and the orifice portion is made to be a thin portion.
The spring constant can be arbitrarily controlled.

According to the eleventh aspect, the orifice portion is fitted in the ring groove provided in the partition wall support member, and the inner wall of the partition wall support member is formed between the orifice portion and the membrane portion. Since the orifice portion is surrounded by the wall around the ring groove, the change in the cross-sectional area of the passage due to the deformation of the orifice portion can be suppressed.

According to the twelfth aspect of the invention, the structure for receiving the pressing portion can be easily formed by pressing the pressing portion against the inner wall of the ring groove.

According to the thirteenth aspect of the present invention, since the tip of the pressing portion has a plurality of inclined surfaces having different angles, it is possible to obtain a non-linear spring characteristic in which the spring constant changes in multiple stages according to the elastic deformation of the membrane portion. Can be.

According to the fourteenth aspect of the present invention, since the elastic portion is provided at a portion of the immovable portion where the pressing portion comes into contact, noise at the time of contact with the pressing portion can be prevented, and the deformation of the pressing portion can be changed. It is also possible to give.

According to the fifteenth aspect of the present invention, since the tip of the pressing portion abuts on the immovable portion in a direction orthogonal to the main vibration input direction, the pressing portion can be formed in the peripheral portion of the membrane portion. In addition to making it easy to secure fixed parts,
It is possible not to hinder the elastic deformation at the center of the membrane portion where the amount of elastic deformation is largest.

According to the sixteenth aspect of the present invention, since the contact area of the pressing portion abutting on the immovable portion changes so as to increase with an increase in the amount of elastic deformation in the membrane portion,
The spring constant of the membrane can be made non-linear.

[Brief description of the drawings]

FIG. 1 is an enlarged sectional view of a main part of a first embodiment.

FIG. 2 is an overall sectional view of the engine mount according to the first embodiment.

FIG. 3 is an enlarged sectional view of a main part of a modified example.

FIG. 4 is a graph showing the spring characteristics of the membrane section of the present invention.

FIG. 5 is a graph showing attenuation characteristics of the present invention.

FIG. 6 is a graph showing dynamic spring characteristics of the present invention.

FIG. 7 is an exploded perspective view showing a main part of the first embodiment, partially cut away;

FIG. 8 is a sectional view of a main part of the second embodiment.

FIG. 9 is a sectional view of a main part of the third embodiment.

FIG. 10 is a sectional view of a main part of a fourth embodiment.

FIG. 11 is a sectional view of a main part of a fifth embodiment.

FIG. 12 is a sectional view of a main part of a sixth embodiment.

[Explanation of symbols]

1: first connection member, 2: second connection member, 3: rubber,
5: diaphragm, 6: rubber partition, 6a: orifice section, 7: first chamber, 8: second chamber, 9: orifice passage, 1
1: membrane part, 12: pressing part, 14: partition wall support member

Claims (16)

[Claims] 1. A first connecting member attached to one of a vehicle body side and a vibration member side, and a second connecting member attached to the other side.
A connecting member, and an elastic body provided between these two members,
A liquid chamber provided between the elastic body and a wall formed by the first or second connecting member; and the liquid chamber divided into two chambers and the periphery of the first or second connecting member. In a liquid ring vibration isolator having a partition wall fixed to any one side of the above and an orifice connecting two liquid chambers defined by the partition wall, the partition wall changes according to input vibration. A membrane portion that allows elastic deformation by a change in the liquid pressure in the liquid chamber, and a partition wall is fixed when the membrane portion elastically deforms, with respect to either the first or second connection member. A liquid-sealed vibration isolator, wherein a pressing portion that abuts on an immovable portion is formed integrally with the membrane portion. 2. The liquid ring vibration isolator according to claim 1, wherein the pressing portion is in non-contact with the immovable portion in an initial state of the membrane portion to which no vibration is input. 3. The liquid ring vibration isolator according to claim 1, wherein the pressing portion is always in contact with the immovable portion from the initial state of the membrane portion. 4. A partition wall surrounding the membrane portion is supported by a partition wall support member fixed to one of the first and second connecting members, and the partition wall support member is pressed against the partition wall support member. 4. The liquid ring vibration isolator according to claim 1, wherein said liquid sealing vibration isolator is an immovable portion for contacting said portion. 5. The liquid-sealing vibration isolator according to claim 4, wherein said partition wall comprises a membrane portion and a pressing portion, and an orifice passage is formed in a space surrounded by said partition wall support member. apparatus. 6. The partition according to claim 1, wherein the membrane and the orifice are made of materials having different characteristics, and the membrane and the orifice are joined to form a partition wall. Liquid-vibration isolator. 7. The liquid ring vibration isolator according to claim 1, wherein the partition wall has a membrane portion and an orifice portion formed integrally. 8. The liquid ring vibration isolator according to claim 6, wherein the thickness of the membrane portion is thinner than that of the orifice portion. 9. The liquid ring vibration isolator according to claim 6, wherein the membrane portion has a uniform thickness with the orifice portion and is thickened. 10. The liquid ring vibration isolator according to claim 6, wherein a central portion of the membrane portion is a thick portion, and a portion between the thick portion and the orifice portion is a thin portion. 11. The partition wall support member is provided with a ring groove for fitting the orifice portion, and a groove is provided between the orifice portion and the membrane portion of the partition wall, and the orifice portion is connected to the partition wall. The partition wall is fitted into the ring groove of the support member, and the inner wall of the partition wall support member forming the ring groove is inserted into a groove formed between the orifice portion and the membrane portion of the partition wall. The liquid-sealed vibration isolator according to claim 6. 12. The liquid ring vibration isolator according to claim 11, wherein a pressing portion abuts on an inner wall of said ring groove. 13. The liquid ring vibration isolator according to claim 1, wherein a plurality of inclined surfaces having different angles are formed at a tip of the pressing portion, which is a portion contacting the immovable portion. . 14. The liquid ring vibration isolator according to claim 1, wherein an elastic portion is provided in a portion of the immovable portion where the pressing portion abuts. 15. The non-moving part according to claim 1, wherein a tip of the pressing part, which is a part contacting the non-moving part, comes into contact with the non-moving part from a direction orthogonal to a main vibration input direction. Liquid ring vibration isolator. 16. The device according to claim 1, wherein the contact area of the pressing portion contacting the immovable portion changes so as to increase in accordance with an increase in the amount of elastic deformation in the membrane portion. Liquid-vibration isolator.