JPH1130270A - Vacuum control type liquid sealed mount device and manufacture thereof - Google Patents

Abstract

PROBLEM TO BE SOLVED: To stabilize the on-off operation of an orifice passage as a flexible film favorably follows in the operation of a pressing member, and to make excellent durability come to fruition by forming the flexible film and the pressing member with separate parts each other, while bonding both these elements together in the pressing part tight enough. SOLUTION: In an engine mount 10, a diaphragm 42 partitioning off a fluid chamber 46 and a pressing member 90 partitioning off an interaction air chamber 112 are formed by separate parts. The diaphragm 42 and the pressing member 90 both separately formed are stuck fast afterward through a fitting projection 118 and fitting hole 116 made up of a rubber elastic body each and they are integrally displaced. In succession, when the interaction air chamber 112 is connected to a vacuum source and a pressing fitting 92 is drawn downward by suction, the diaphragm 42 is also displaced downward integrally together with this pressing fitting 92, and consequently the communicating state of a first orifice passage 86 is surely secured and maintained, whereby a vibro- isolating effect is effectively brought into full play. In addition, any drop in durability by abrasion or the like due to relative displacement is thus evaded.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a fluid-filled mounting device and a method of manufacturing the fluid-filled mounting device, in which a vibration damping effect is obtained based on a flow action of a fluid sealed therein, and in particular, a communication of an orifice passage by a negative pressure action. The present invention relates to a negative pressure control type fluid-filled mounting device capable of controlling vibration isolation characteristics by switching states, and an advantageous manufacturing method thereof.

[0002]

2. Description of the Related Art Conventionally, as a kind of a vibration isolating device such as a vibration isolating support or a vibration isolating connector interposed between members constituting a vibration transmitting system, a fluid in which an incompressible fluid such as water is sealed. 2. Description of the Related Art A fluid-filled mounting device in which a chamber is formed and a vibration-proof effect is obtained by utilizing a flow action such as a resonance action of a fluid is known, and is used for an engine mount for an automobile or the like. Furthermore, in order to achieve required characteristics in an automobile engine mount or the like in which different vibration isolation performances are required depending on a running state of a vehicle, by switching a communication state of an orifice passage through which a sealed fluid is caused to flow at the time of vibration input,
There are also proposals in which the anti-vibration characteristics can be controlled.

[0003] Such a fluid-filled mounting device is, for example, disclosed in Japanese Patent Application Laid-Open No. 8-270718, etc., in which a first mounting member and a second mounting member which are mounted on each member to be vibration-isolated and connected. The members are connected by the main rubber elastic body, and a part of the wall is formed of the main rubber elastic body on both sides of the partition member fixedly supported by the second mounting member. Is formed, and a part of the wall portion is formed of a flexible membrane to form an equilibrium chamber in which a change in volume is easily allowed, and the pressure receiving chamber and the equilibrium chamber that constitute the fluid chamber are formed. While communicating with each other by the orifice passage, the orifice passage is opposed to the opening of the orifice passage with the flexible film interposed therebetween, and is pressed by the flexible film by the urging means, thereby making the opening of the orifice passage flexible. Occlude with membrane A working air chamber is formed behind the pressing member, and a negative pressure is applied to the working air chamber to release the pressing force on the flexible membrane by the pressing member to open the orifice passage. This is advantageously achieved by a stiffening structure. If such a structure is adopted, there is no need to dispose a valve body for opening and closing the orifice passage and its driving means in the fluid chamber, and the structure is extremely simplified. Since the components can be composed of separate parts, it is easy to manufacture and assemble each part, and by selecting the material of each part independently, it is possible to achieve higher levels of durability and required performance. There are advantages such as being possible.

However, the present inventors have studied in detail such a conventional mounting device, and found that when used as an engine mount or the like, the flexible film is deformed into an irregular shape when heated. Due to this, even under a state where the pressing force by the pressing member is released, the flexible film becomes difficult to follow the pressing member, and the opening of the orifice passage becomes flexible. By being in a state of being blocked or narrowed by the membrane, it may be difficult to effectively exert the intended vibration isolation effect by the orifice passage,
It became clear.

In addition, if the flexible film is difficult to follow the pressing member, the contact surface between the flexible film and the pressing member is liable to be worn, so that the durability is greatly reduced. The problem of doing so is also raised.

[0006]

Here, the present invention has been made to solve the problems newly found by the present inventors as described above, and the problem to be solved is a flexible material. The membrane and a pressing member that opens and closes the orifice passage through the flexible membrane are formed as separate members, and the flexible membrane can advantageously follow the operation of the pressing member to open and close the orifice passage. An object of the present invention is to provide a negative pressure control type fluid-filled mounting device having an improved structure capable of stably and reliably operating and achieving excellent durability, and an advantageous manufacturing method thereof.

[0007]

In order to solve such a problem, a feature of the present invention relating to a negative pressure control type fluid-filled mounting device is that a first mounting member has a bottomed cylindrical shape. The first mounting member and the second mounting member are connected to each other by the rubber elastic body of the main body, and the inside of the second mounting member is flexible. A fluid chamber in which an incompressible fluid is sealed between the flexible membrane and the main rubber elastic body is formed by being partitioned on both sides in the axial direction by the membrane, and a partition member is housed in the fluid chamber. A pressure receiving chamber fixedly supported by the second mounting member and having a part of a wall portion formed of the main rubber elastic body on both axial sides of the partition member; An equilibrium chamber in which a part of the wall is formed by the membrane is formed,
Further, a first orifice passage communicating the pressure receiving chamber and the equilibrium chamber with each other is provided, and on the bottom side of the second mounting member opposite to the fluid chamber across the flexible membrane, A pressing member is provided opposite to the opening of the first orifice passage with the flexible membrane interposed therebetween, the pressing member being movable toward and away from the opening of the first orifice passage. Urging means for pressing the pressing member against the flexible membrane to close the opening of the first orifice passage with the flexible membrane is provided, and further comprising the second pressing means by the pressing member. A working air chamber is formed by airtightly partitioning the bottom of the mounting member, and by applying a negative pressure to the working air chamber, the pressing force of the pressing member against the flexible membrane is released and the first air pressure is released. Negative pressure control where the opening of the orifice passage is opened In the fluid-filled type mounting device, the flexible film and the pressing member are formed as separate components from each other, and the pressing member and the pressing member are formed at a pressing portion of the pressing member against the flexible film. That is, the flexible film is fixed.

In the negative pressure control type fluid-filled mounting device having the structure according to the present invention, the pressure of the pressing member against the flexible film is controlled by controlling the action of the negative pressure on the working air chamber. And the opening of the first orifice passage can be switched between a closed state and a communicating state by a flexible membrane, whereby the resonance effect of the fluid caused to flow through the first orifice passage can be achieved. Thus, the anti-vibration effect based on the flow action is selectively exerted, and the anti-vibration effect can be switched and controlled.

In such a negative pressure control type fluid-filled mounting device, since the flexible film and the pressing member are formed as separate parts and fixed later, the flexible film and the pressing member are fixed. In contrast, by setting different materials, required characteristics such as durability can be easily and advantageously achieved, and the flexible film integrally follows the pressing member. Therefore, the action / release of the pressing force of the pressing member against the flexible membrane ensures that the flexible membrane abuts / separates from the opening of the first orifice passage. As a result, the switching of the communication / interruption state of the first orifice passage can be performed extremely stably, and the desired anti-vibration performance and the switching control thereof are advantageously and stably performed. It can be realized.

Particularly, even when the flexible membrane is deformed due to settling, thermal action, or the like, the flexible membrane is forcibly brought into contact with / separated from the opening of the first orifice passage by the pressing member. In addition, the switching control of the vibration isolation characteristics by the communication / interruption of the first orifice passage can be stably performed with excellent reliability over a long period of time.

In addition, since the flexible film and the pressing member are post-fixed, abrasion due to rubbing or the like at the contact portion between the flexible film and the pressing member can be advantageously reduced or prevented. Excellent durability will be exhibited.

The fixing structure between the flexible film and the pressing member is as follows.
Any material can be used as long as they can be fixed after they are formed separately, and there is no particular limitation because a large load such as a vibration load is not applied to the fixed portion. Specifically, post-adhesion using an appropriate adhesive or the like is possible, but preferably, as described in claim 2, the flexible film and the pressing member are formed in a shape-related manner. Advantageously, a structure in which they are secured to each other by a stop mechanism. The shape locking mechanism is, for example, an appropriate fitting structure, an engaging structure, a locking structure, or the like by a combination such as a projection and a fitting hole or a hook-shaped locking piece and a locking groove. It is possible to provide the locking mechanism at multiple locations or to provide a suitable length, and the material of such a locking mechanism can be a rubber elastic body, resin, metal, etc. It is. If such a locking mechanism is employed, work such as application of an adhesive is not required, and assembling workability can be improved. However, in addition to the shape locking mechanism, bonding with an adhesive may be employed.

Further, the materials of the flexible film and the pressing member are as follows.
It is not particularly limited and can be formed using a deformable resin sheet or the like having fluid tightness,
Preferably, as described in claim 3, a structure in which the flexible film and the pressing member include rubber elastic films of different materials is advantageously employed. By adopting rubber elastic membrane, excellent fluid tightness and
The deformability of the flexible film and the displacement tolerance of the pressing member can be advantageously and easily realized, and furthermore, rubber elastic films of different materials are used for the flexible film and the pressing member. Thereby, required characteristics such as durability can be highly achieved. Specifically, for example, when a negative pressure generated in the intake system of the internal combustion engine is used as the negative pressure applied to the working air chamber, there are different characteristics such as the sealed fluid performance in the flexible membrane and the gasoline resistance in the pressing member. The required characteristics of the flexible film and the pressing member can be both satisfied to a high degree, and as a result, excellent durability can be realized.

Further, in the negative pressure control type fluid-filled mounting device having the structure according to the present invention, the flexible film is positioned with respect to the partition member. Accordingly, a positioning mechanism that relatively positions a fixing portion of the flexible film to be fixed to the pressing member with respect to the pressing member is preferably employed. If such a positioning mechanism is employed, the work of post-fixing the flexible film and the pressing member is facilitated, and the fixing failure and the like can be prevented, and the quality of the product can be advantageously improved. In addition, as such a positioning mechanism,
For example, it can be realized by giving a shape corresponding to the shape of the lower surface of the partition member to the flexible film.

The specific structures of the flexible membrane and the pressing member are not particularly limited, either. For example, the flexible membrane may have a second structure in order to ensure a sufficient variable volume of the equilibrium chamber. Is formed by a curved thin rubber film or an easily deformable resin sheet or the like which spreads in a direction perpendicular to the axis inside the mounting member, and its outer peripheral edge portion is fixed to and supported by the cylindrical wall portion of the second mounting member. It is desirable that the pressing member be rigid, and the pressing member be made rigid so that the flexible film can be advantageously pressed against the partition member. In order to ensure this, it is preferable that the outer peripheral portion of the pressing portion is elastically connected to and supported by the cylindrical wall portion of the second mounting member via a rubber elastic plate. Furthermore, the pressing position of the pressing member on the flexible membrane is not particularly limited, but in order to easily secure stable operability,
The opening of the first orifice passage toward the equilibrium chamber is provided substantially at the center of the partition member, and the central portion of the flexible membrane is pressed toward the partition member, thereby opening the first orifice passage. It is desirable to be able to shut off.

Further, in the negative pressure control type fluid-filled mounting device having the structure according to the present invention, as described in claim 5, the negative pressure control type fluid-filled mounting device is formed between the pressure receiving chamber and the equilibrium chamber. A second orifice passage tuned to a lower frequency range than the first orifice passage, which allows the two chambers to communicate with each other, is preferably employed. When such a second orifice passage is employed, in a state in which the first orifice passage is blocked, a fluid flow is generated through the second orifice passage. By the control, the vibration damping effect by the first orifice passage and the vibration damping effect by the second orifice passage can be selectively exhibited.

Further, in order to solve the above-mentioned problems,
A feature of the present invention relating to a method of manufacturing a negative pressure control type fluid-filled mounting device is described in claim 1.
When manufacturing the negative pressure control type fluid-filled mounting device having the above-described structure, the second mounting member has a divided body structure including an opening-side cylindrical body and a bottom-side bottomed cylindrical body. The fluid chamber is formed by connecting the cylindrical member to the first mounting member via the main rubber elastic body and assembling the partition member and the flexible film to the cylindrical member. The first assembly, and the second assembly, in which the working air chamber is formed by assembling the pressing member and the urging means with respect to the bottomed cylindrical body, are separately manufactured, At the time of assembling the first assembly and the second assembly, the flexible film is fixed to the pressing member. Applying a load, when assembling the first assembly and the second assembly By removing such precompression load is the flexible membrane caused negative pressure in said fluid chamber to which is adapted for positioning adsorbed on the partition member.

According to the manufacturing method of the present invention, the flexible film is easily deformed by the flexible film being attracted and positioned by the partition member by the negative pressure generated in the fluid chamber. Since the positioning members can be advantageously positioned and held, when the pressing members of the second assembly are fixed to the flexible film, the relative positioning between the pressing members and the flexible film is easily and advantageously made. Therefore, it is possible to easily and stably fix the pressing member to the flexible film.

Further, even when a large supporting load is applied as a static load under the mounted state of the mounting device, the pressure rise of the fluid chamber due to the supporting load is reduced or avoided, and the volume change of the equilibrium chamber is sufficient. In addition, there is an advantage that the desired vibration damping effect can be advantageously exhibited.

[0020] Further, when the first assembly and the second assembly are assembled to each other, the flexible film and the pressing member are formed into a shape by using the shape locking mechanism according to the second aspect. In order to fix the flexible film and the pressing member, at least one of the engaging portions of the flexible film and the pressing member is lubricated by permeation, absorption, volatilization, or the like. It is also effective to apply an agent. By applying a lubricant as described above, the fixing work of the flexible film and the pressing member by the locking mechanism can be easily performed, and the improvement in mount manufacturability and the manufacturing cycle can be advantageously achieved. Further, since the lubricant disappears after the fixing operation, a sufficiently strong fixing force can be exhibited when the mounting device is used.

Furthermore, in the method of the present invention, claim 8
As described in the above, when removing the pre-compression load applied to the rubber elastic body of the main body at the time of assembling the first assembly and the second assembly, the flexible membrane is set in advance. It is desirable to determine the position where the flexible film is attracted to the partition member by using a jig that guides the flexible film to the fixed position. According to such a manufacturing method, the fixing portions of the pressing member and the flexible film can be relatively easily and stably positioned, and the fixing workability is further improved. The jig for guiding the flexible film to a fixed position includes, for example, an engaging portion that is engaged with a fixing portion of the flexible film, a partition member and a cylindrical body of the first assembly, and the like. And a positioning portion which is positioned with respect to the first assembly, and which can guide the fixing portion of the flexible membrane to a fixed position by being positioned by the partition member or the like of the first assembly. .

[0022]

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

FIG. 1 shows an engine mount 10 for an automobile according to an embodiment of the present invention.
The engine mount 10 has a structure in which a first mounting member 12 as a first mounting member and a second mounting member 14 as a second mounting member are elastically connected by a main rubber elastic body 16. The first mounting member 12 is attached to the power unit, and the second mounting member 14 is attached to the body, so that the power unit is supported on the body with vibration isolation. In addition,
In such a mounted state, as shown in FIG. 2, a power unit load is applied between the first mounting bracket 12 and the second mounting bracket 14, and the main rubber elastic body 16 is compressed and deformed. Accordingly, the first mounting bracket 12 and the second mounting bracket 14 are displaced by a predetermined amount in a direction approaching each other and are positioned, and the main vibration to be damped is reduced by the first mounting bracket 12 and the second mounting bracket 12. The input is made in the approach / separation direction (mount axis direction) of the mounting bracket 14.
In the following description, the terms “upper” and “lower” refer, in principle, to the vertical direction in FIG.

More specifically, the first mounting member 12 has a substantially disk shape, and a circular rod-shaped holding member 18 is fixed to a central portion of the first mounting member 12 so as to protrude downward in the axial direction. I have. Then, with respect to the lower end portion of the holding bracket 18,
An umbrella fitting 20 having a substantially hat shape and extending in a direction perpendicular to the axis is fixed by bolts. Further, a first mounting bolt 22 that penetrates through the first mounting bracket 12 and protrudes upward is integrally formed at an upper end portion of the holding bracket 18. The mounting bracket 12 is fixedly mounted on a power unit (not shown).

In the second mounting member 14, a cylindrical metal member 24 having a large diameter and a substantially cylindrical shape and a bottom metal member 28 having a bottomed cylindrical shape are axially overlapped with each other and connected on the same axis. It has a substantially cylindrical shape with a deep bottom as a whole. In this case, the cylindrical metal fitting 24 has a tapered portion 30 whose diameter is increased upward at the upper end in the axial direction, and the lower end portion in the axial direction has a slightly larger diameter with a stepped shape. 32. The bottom fitting 28 has a flange 34 extending radially outward at the periphery of the opening, and a second mounting bolt 36 protruding downward through the center portion on the bottom wall. , 36 are fixedly mounted, and the second mounting bracket 14 is fixedly mounted to a body (not shown) by the second mounting bolts 36, 36. Then, the caulking portion 32 of the tubular metal fitting 24 is fixed to the flange 34 of the bottom fitting 28 by caulking, and the two fittings 24 and 28 are fixedly connected to each other, so that a deep bottomed bottomed cylinder as a whole is obtained. A second mounting fitting 14 having a shape is formed.

The first mounting member 12 is arranged at a predetermined distance in the opening direction of the second mounting member 14, and a holding member 18 fixed to the first mounting member 12 is provided.
It is inserted in the axial direction from the opening of the second mounting member 14. Further, the main rubber elastic body 16 is interposed between the opposing surfaces of the first mounting member 12 and the second mounting member 14 which are arranged to face each other in the axial direction. The main body rubber elastic body 16
It has a substantially truncated conical shape as a whole, and the first mounting bracket 12 is provided on the small-diameter side end surface, and the tapered portion 30 of the second mounting bracket 14 (cylindrical metal fitting 24) is provided on the large-diameter end peripheral surface. It has been vulcanized. As a result, the axially upper opening of the cylindrical metal member 24 constituting the second mounting member 14 is closed by the main rubber elastic body 16 in a fluid-tight manner. In addition, holding bracket 1
Reference numeral 8 denotes a position in which the umbrella fitting 20 supported by the holding fitting 18 extends in the direction perpendicular to the axis within the upper cylindrical fitting 24, penetrating on the central axis of the main rubber elastic body 16 and protruding from the large-diameter end face. It has been impatient.

Further, inside the second mounting bracket 14,
A partition member 40 having a thick disk shape as a whole and a diaphragm 42 as a flexible film made of a rubber elastic film having a thin disk shape are accommodated in the axial direction so as to overlap each other. These partition member 40 and diaphragm 4
2 is located at an axially intermediate portion of the second mounting bracket 14 by inserting each outer peripheral edge into the caulking section 32 of the tubular metal fitting 24 and caulking with the flange 34 of the bottom fitting 28. And is fixedly attached to the second mounting bracket 14 in a state of spreading in a direction perpendicular to the axis. In addition,
A ring fitting 44 is vulcanized and bonded to the outer peripheral edge of the diaphragm 42, and the ring fitting 44 is
Is press-fitted into the cylindrical fitting 24, which constitutes the second mounting fitting 14, so that the lower opening in the axial direction is
2 and is closed in a fluid-tight manner, and the holding force of the second mounting member 14 is advantageously exerted.

As a result, the space between the main rubber elastic body 16 and the diaphragm 42 is sealed with respect to the external space inside the cylindrical fitting 24 constituting the second mounting fitting 14, so that a predetermined incompressible fluid is filled therein. A fluid chamber 46 is provided. Further, the fluid chamber 46 is divided into two parts by a partition member 40 at an intermediate portion in the axial direction. Therefore, a part of the wall portion is formed of the main rubber elastic body 16 above the partition member 40 and vibrates. While a pressure receiving chamber 54 in which an internal pressure change is generated at the time of input is formed, an equilibrium chamber 56 in which a part of the wall is formed of the diaphragm 42 and whose volume change is easily allowed is formed below the partition member 40. Is formed. The enclosed fluid is preferably a low-viscosity fluid such as water, an alkylene glycol, a polyalkylene glycol, or a silicone oil, particularly 0.1 Pa · s or less, so that the vibration damping effect based on the resonance action of the fluid is effectively exhibited. Those having a viscosity of are suitably employed.

A stopper member 60 having a substantially cylindrical shape and integrally formed with an annular stopper portion 58 protruding radially inward at an upper end portion in the axial direction is provided inside the cylindrical member 24.
Are inserted along the inner peripheral surface, and the stopper fitting 6
The lower end in the axial direction of 0 is bent radially outward, and is fixed together with the partition member 40 and the diaphragm 42 to the second mounting member 14 so as to be housed in the pressure receiving chamber 54. Are located. The stopper 5
8 is covered with a cushion rubber layer 62. In addition, under the assembled state of the stopper fitting 60, the stopper portion 58 is positioned to face axially upward with respect to the outer peripheral edge of the umbrella fitting 20 supported by the first mounting fitting 12, and
The amount of deformation of the main rubber elastic body 16 in the rebound direction in which the first fitting 12 and the second fitting 14 are relatively separated by the contact of the umbrella fitting 20 with the stopper portion 58 is limited. Has become.

As shown in FIG. 2, when the power unit is loaded on the vehicle, the first mounting bracket 1 is moved from the state shown in FIG.
The second and second mounting brackets 14 are relatively displaced in the approaching direction, and the umbrella bracket 20 is separated from the stopper portion 58 by a predetermined amount in the axial direction downward. Interference between the umbrella fitting 20 and the stopper 58 is avoided. Further, in such a mounted state, an annular stenotic flow path 64 is formed between the outer peripheral surface of the umbrella bracket 20 and the inner peripheral surface of the cylindrical portion of the stopper bracket 60, and when a vibration is input, the pressure receiving chamber When the umbrella fitting 20 is displaced in 54 to generate a fluid flow through the constricted flow path 64, the vibration damping effect against high frequency vibration such as muffled sound is generated based on the flow action such as resonance action of the fluid. Is to be demonstrated.

Further, the partitioning member 40 has a structure in which a thin disk-shaped lid is overlapped on a disk-shaped orifice forming body 66 formed of a rigid material such as resin or metal. I have. The orifice forming body 66 includes an outer peripheral groove 70 extending at least one circumference in the circumferential direction along the outer peripheral edge, and a peripheral groove located on the inner peripheral side of the outer peripheral groove 70. An inner peripheral groove 72 extending a little less than one circumference in the direction is formed to open on the upper surface, and a circular central recess 74 that opens downward is formed in the center portion. ing. The inner peripheral groove 72 is covered with the lid 68, so that both ends are connected to the pressure receiving chamber 54 and the balance chamber 56 through the communication holes 82 and 84.
A first orifice passage 86 is formed to communicate the chambers 54 and 56 with each other, and the outer peripheral side groove 70 is covered with a lid 68 so that both ends are formed as communication holes. A second orifice passage 80 is formed to communicate with the pressure receiving chamber 54 and the equilibrium chamber 56 through 76 and 78, and to communicate the chambers 54 and 56 with each other. Also, in particular, the equilibrium chamber 5 of the first orifice passage 86
The opening (communication hole) 84 to the side of the orifice 6
6 is provided on the peripheral wall of the central recess 74, and is opened in the central recess 74, and communicates with the balance chamber 56 through the central recess 74.

The second orifice passage 80 has a small value of the ratio of the cross-sectional area of the flow path: A to the length of the flow path: L: A / L. Based on the action, an effective anti-vibration effect (attenuation effect) against low-frequency vibration corresponding to a shake or the like is exerted. On the other hand, the first orifice passage 8
6, the ratio of the passage cross-sectional area: A to the passage length: L: A / L is set to be larger than that of the second orifice passage 80, and is based on the resonance action of the fluid flowing through the inside. In addition, an effective anti-vibration effect (low dynamic spring effect) against medium-frequency vibration corresponding to idle vibration or the like is exhibited.

Further, the bottom fitting 28 constituting the second mounting fitting 14 has a sealing bottom fitting 8 having a thin bottomed cylindrical shape slightly smaller than the bottom fitting 28 inside the bottom fitting 28.
8 is inserted and fixedly assembled along the inner peripheral surface of the bottom fitting 28. Then, by covering the inner peripheral surface of the bottom fitting 28 with the sealing bottom fitting 88, a chamber sealed with respect to the external space inside the bottom fitting 28, that is, between the diaphragm 42 and the sealing bottom fitting 88. It is defined.

A pressing member 90 having a substantially hat shape as a whole is accommodated in the closed chamber. The pressing member 90 includes a substantially inverted cup-shaped pressing metal member 92 and a support rubber elastic body 94 for elastically connecting and supporting the pressing metal member 92 to the seal bottom metal member 88. The press fitting 92 is provided with a circular through hole 98 at the center of the upper bottom 96, and integrally formed with a flange 100 extending radially outward from the peripheral edge of the opening. In addition, the supporting rubber elastic body 94 is slightly inclined axially downward from the flange 100 of the pressing fitting 92 radially outward from the covering portion 102 covering the entire outer peripheral surface of the pressing fitting 92. It has a ring-shaped supporting portion 104 that expands, and a ring fitting 106 is vulcanized and bonded to the outer peripheral edge of the supporting portion 104. Furthermore, a circular block-shaped elastic fitting portion 108 protruding inward (axially downward) from the central portion of the upper bottom portion 96 is provided inside the press fitting 92.
It is formed integrally with the supporting rubber elastic body 94.

The pressing member 90 is formed by inserting the ring fitting 106 into the seal bottom fitting 88 and disposing the ring fitting 106 at the lower part of the cylindrical wall. It is assembled by being tightly fixed to 106, whereby the pressing fitting 92 is
The seal bottom metal member 88 and thus the second mounting member 14 are elastically supported by the support portion 104 of the support rubber elastic body 94. Further, by the pressing member 90,
A closed chamber defined between the diaphragm 42 and the seal bottom metal member 88 is fluid-tightly divided into a bottom side and an opening side of the seal bottom metal member 88, so that the pressing member 90 and the diaphragm 42 An air chamber 110 allowing deformation of the diaphragm 42 is formed between the pressing member 90 and the sealing bottom metal member 88, and a sealed working air chamber 11
2 are formed. Note that the air chamber 110 may be communicated with an external space.

Further, a coil spring 114 is accommodated in the working air chamber 112, and the seal bottom fitting 8 is provided.
8 and the upper bottom 96 of the pressing fitting 92, the pressing fitting 92 is directed to the direction away from the bottom of the seal bottom fitting 88 (upward in the axial direction) with respect to the pressing fitting 92. Is being exerted. Then, the pressing metal 92 is elastically protruded upward by the urging force of the coil spring 114, so that the upper bottom portion 96 of the pressing metal 92 abuts on the central portion 115 of the diaphragm 42,
The diaphragm 42 is pressed against the central lower surface of the partition member 40 with the diaphragm 42 interposed therebetween. As a result, the opening of the central recess 74 formed in the partition member 40 is closed by the central portion 115 of the diaphragm 42, so that the opening is communicated with the balance chamber 56 through the central recess 74. The first orifice passage 86 is substantially blocked. Note that the diaphragm 42 has a pressing fitting 92.
The central portion 115 pressed against the partition member 40 by
It is slightly thick. The communication hole 78 of the second orifice passage 80 with respect to the equilibrium chamber 56 is
As a result, the second orifice passage 80 is always kept in communication with the outer peripheral side of the contact portion of the diaphragm 42 pressed by the second orifice.

The elastic fitting portion 108 provided on the pressing fitting 92 has a fitting hole 116 which opens upward through a through hole 98 in the upper bottom 96 of the pressing fitting 92.
On the other hand, a fitting projection 118 protruding downward is formed integrally with a rubber elastic body at the center of the diaphragm 42 with which the pressing fitting 92 abuts. Each of the fitting holes 116 and the fitting projections 118 has a droplet shape substantially corresponding to each other, whose diameter increases as going downward.
The fitting projection 118 is pushed into the fitting hole 116 by the elastic deformation of the fitting hole 116 and fitted. The fitting protrusion 118 fitted in the fitting hole 116 is difficult for the large-diameter tip end of the fitting protrusion 118 to pass through the narrowed opening of the fitting hole 116, and is elastically fitted by its shape action. Separation from the portion 108 is prevented, so that the upper bottom portion 96 of the press fitting 92 is fixed to the central portion 115 of the diaphragm 42. In particular, in the present embodiment, the elastic fitting portion 10 forming the peripheral wall portion of the opening portion of the fitting hole 116 is provided.
8 is suppressed by the press fitting 92, so that the detachment resistance of the fitting projection 118 from the fitting hole 116 is more advantageously exerted.

The working air chamber 112 has a bottom fitting 28.
And a connecting pipe 120 disposed through the center of each bottom of the seal bottom fitting 88 to communicate with each other. Through the connecting pipe 120, an external air pipe 122 is connected. . And, by this air line 122,
The working air chamber 112 is alternatively connected to a negative pressure source and the atmosphere via a switching valve 124. As the negative pressure source, a negative pressure generated in the intake system of the internal combustion engine is advantageously used. Thereby, the working air chamber 1
2 is connected to a negative pressure source and a negative pressure is applied.
As shown in FIG. 7, a negative pressure suction force is applied to the pressing fitting 92, and the pressing fitting 92 is displaced toward the bottom side of the seal bottom fitting 88 against the urging force of the coil spring 113. I am being squeezed. When the pressing fitting 92 is displaced downward as described above, the central portion 115 of the diaphragm 42 fixed to the upper bottom 96 of the pressing fitting 92 is also displaced downward as a result. 40 central recesses 74
Are opened so that the first orifice passage 86 is kept in communication.

In short, the engine mount 1 as described above
At 0, the first orifice passage 86 is switched between the open state and the closed state by controlling the switching valve 124 in accordance with the running state of the vehicle or the like under the state of attachment to the vehicle as shown in FIG. For example, when the vehicle is running, the working air chamber 112 is communicated with the atmosphere to shut off the first orifice passage 86, so that the second orifice passage 80 can be switched. While obtaining a damping effect on shakes etc. based on the resonance action of the fluid flowing through
When the vehicle is stopped, the working air chamber 112 is connected to the negative pressure source, and the first orifice passage 86 is connected to the working air chamber 112, so that idle vibration or the like is generated based on the resonance action of the fluid flowing through the first orifice passage 86. The insulating effect can be obtained. While the first orifice passage 86 is in communication with the second orifice passage 80, the second orifice passage 8 is in communication with the first orifice passage 86.
Since the flow resistance of the first orifice passage 86 is made sufficiently smaller than 0, the second orifice passage 80 is substantially cut off, and the vibration-proof effect of the first orifice passage 86 is reduced. It can be effectively used.

There, such an engine mount 1
0, the diaphragm 42 defining the fluid chamber 46
And the pressing member 90 defining the working air chamber 112 are formed as separate components, so that the diaphragm 42 and the supporting rubber elastic body 94 can be easily manufactured using a mold having a simple structure. In addition, different materials can be used for the diaphragm 42 and the support rubber elastic body 94. Therefore, the diaphragm 42 is made of a material having excellent liquid resistance to the sealed fluid in the fluid chamber 46, while the support rubber elastic body 94 is made of gasoline or the like contained in the negative pressure applied to the working air chamber 112. A material having excellent resistance to oil is adopted, whereby excellent durability can be obtained.

In addition, since the diaphragm 42 and the pressing member 90 formed separately as described above are post-fixed and can be integrally displaced, the working air chamber 112 is connected to a negative pressure source. When the pressing fitting 92 is sucked downward, the diaphragm 42 is also displaced downward integrally with the pressing fitting 92, so that the central portion 115 of the diaphragm 42 is securely and sufficiently separated from the partition member 40. Become. Thereby, the central recess 74 of the partition member 40 is opened with a sufficient opening area to the balancing chamber 56, and the communication state of the first orifice passage 86 is reliably and stably secured and maintained. Therefore, the vibration damping effect of the first orifice passage 86 can be effectively exerted.

Further, since the diaphragm 42 and the pressing member 90 are integrally displaced, the occurrence of rubbing due to the relative displacement between the two members is prevented as much as possible, and the reduction in durability due to wear and the like is prevented. By avoiding this, there is also an effect that better mount durability is realized.

Further, the engine mount 1 of the present embodiment
In the case of No. 0, the fixing between the diaphragm 42 and the pressing member 90 is performed by the fitting of the fitting projection 118 formed of a rubber elastic body into the fitting hole 116, so that a special fixing member or a fixing process is performed. No need, diaphragm 4
There is also an advantage that the fixation of the pressing member 90 to the pressing member 2 is easily realized by a simple structure. However, the fitting protrusion 118
It is also possible to apply an adhesive or the like to the fitting portion between the fitting hole 116 and the fitting hole 116.

Further, the engine mount 10 of the present embodiment
5, a communication hole 84 of the first orifice passage 86 to the equilibrium chamber 56 side is opened at a substantially central portion of the partition member 40, and is closed by a central portion 115 of the diaphragm 42. Therefore, even in such a closed state, the deformation of the diaphragm 42 is easily allowed, the volume variability of the equilibrium chamber 56 can be advantageously secured, and the first elastic member 94 based on the elasticity of the supporting rubber elastic body 94 of the pressing member 90 can be obtained. The orifice passage 86 can also advantageously obtain the blocking force, and the intended mount anti-vibration performance can be realized more effectively.

By the way, the fitting operation of the fitting projection 118 into the fitting hole 116 is to be performed during the mounting manufacturing process, but is preferably performed as follows.

That is, first, as shown in FIG. 3, an integrally vulcanized molded product 130 of the main rubber elastic body 16 having the first mounting fitting 12 and the tubular fitting 24 is prepared.
After the stopper fitting 60 is inserted into the first fitting 12, the umbrella fitting 20 is attached to the first fitting 12. continue,
The assembled body is immersed in a predetermined incompressible fluid 132, and the partition member 40 is inserted into the caulked portion 32 of the tubular metal fitting 24 in the fluid, and then the diaphragm 42 is removed. Ring fitting 4 bonded to the outer peripheral surface by vulcanization
4 is press-fitted into the caulked portion 32 of the tube fitting 24 and assembled.
Thereby, the pressure receiving chamber 5 is provided on both sides of the partition member 40.
4 and the first assembly 13 in which the balance chamber 56 is formed, respectively.
4 and simultaneously with the formation of the first assembly 134, the pressure receiving chamber 54 and the equilibrium chamber 56 are filled with an incompressible fluid.

Here, when assembling the diaphragm 42 to the integrally vulcanized molded product 130, as shown in FIG. 4, an appropriate clamp device 136 or the like is used to attach the first mounting member 12 and the cylindrical member. It is desirable to perform the operation in a state where the main rubber elastic body 16 is compressed and deformed in the direction of inputting the support load of the power unit by bringing the body 24 closer to the axial direction. Then, after assembling the diaphragm 42, the compressive load by the clamp device 136 is removed. Then, the main rubber elastic body 16 is restored and deformed by the elastic force, and a negative pressure is generated in the fluid chamber 46. Therefore, the diaphragm 42 assembled in a free shape in which no external force is applied (see FIG. 4). Is sucked into the fluid chamber 46 (partition member 40 side) and deformed, as shown in FIG.

At this time, the amount of compressive deformation of the rubber elastic body 16, that is, the compressive load by the clamp device 136 is adjusted, and the negative pressure generated in the fluid chamber 46 due to the removal of the compressive load by the clamp device 136 causes at least the diaphragm 42 to move. The central portion 115 is set to such an extent that it can be sucked and held on the lower surface of the partition member 40. Thus, in the first assembly 134, the central portion 115 of the diaphragm 42
As a result, the fitting projection 118 can be positioned.

Also, preferably, as shown in FIG. 4, when the compressive load is removed by the clamp device 136, it is engaged with the central portion 115 of the diaphragm 42,
Using a set jig 142 for positioning the central portion 115, the central portion 115 of the diaphragm 42 is
It is made to be adsorbed and held at a fixed position on zero. In addition,
As shown in the figure, the set jig 142 has, for example, an engagement recess 144 that engages with the engagement protrusion 118 protruding from the diaphragm 42, and a first assembly 134 by a positioning mechanism (not shown). What can be guided to a fixed relative position with respect to the partition member 40 by extension is preferably adopted.

Still more preferably, at least the central portion 115 of the diaphragm 42 is provided in a free shape in which no external force is applied, together with or instead of using such a set jig 142. But,
The partition member 40 has a shape substantially corresponding to the shape of the lower surface of the partition member 40 opposed thereto, and the like.
The structure which can perform relative positioning with respect to is employ | adopted. Specifically, in the present embodiment, as shown in FIG. 4, in the free shape of the diaphragm 42, the outer peripheral edge of the central portion 115 is curved downward over the entire circumference. When a negative pressure is generated in the fluid chamber 46 by the removal of the compressive load by the clamp device 136, the annular curved portion 138 fits into the annular step 140 formed on the lower surface of the partition member 40, and the shape is reduced. Thus, relative positioning is possible.

On the other hand, the first assembly 134 as described above
As shown in FIG. 3, the connection pipe 120 is press-fitted and fixed to the seal bottom fitting 88 in the atmosphere, and the coil spring 114 and the pressing member 9 are separately formed.
0 is interpolated, and the ring member 106 as a pressing member is fixed to the seal bottom member 88 by drawing or the like, thereby integrally assembling. After that, the second assembly 146 is manufactured by inserting the seal bottom fitting 88 into the bottom fitting 28 constituting the second mounting fitting 14.

Subsequently, the obtained second assembly 146 is
The flange 34 of the bottom fitting 28 is attached to the first assembly 134 in the axial direction,
2 and the second mounting furniture 14 is formed by caulking and fixing. At the same time, the pressing member 90 is pressed against the diaphragm 42 based on the elastic force of the coil spring 114 and the supporting rubber elastic body 94, so that the fitting projection 118 of the diaphragm 42 is inserted into the fitting hole 116 of the pressing member 90. The target engine mount 10 is obtained by being fitted and fixedly fitted.

According to such a manufacturing method, it is possible to easily perform operations such as assembling the diaphragm 42 and the pressing member 90 separately formed and fitting the fitting projection 118 into the fitting hole 116. In particular, the fitting projection 118 of the diaphragm 42
The positioning is advantageously performed on the partition member 40 by the suction effect of the negative pressure generated on the partitioning member 40, so that the positioning of the fitting projection 118 and the fitting hole 116, and thus the fitting projection 118 to the fitting hole 116 are performed. The fitting can be performed very easily.

When the fitting projection 118 is fitted into the fitting hole 116, the outer peripheral surface of the fitting projection 118 is
By applying a lubricant to at least one of the inner peripheral surfaces of the 16, such fitting can be performed more easily. In this case, in particular, as the lubricant, the diaphragm 42 and the pressing member 9 after fitting are used.
In order to advantageously secure a fixing force of 0, it is desirable that the material disappears relatively quickly after fitting. Specifically, an oil or the like which is easily absorbed by the rubber, such as a plasticizer or a softening agent used as a rubber processing material, or a material having a high volatility can be suitably used.

Although the embodiment of the present invention has been described in detail, this is a literal example, and the present invention is not limited to the description of the embodiment.

For example, if the airtightness of the bottom fitting 28 is sufficiently ensured, it is not always necessary to provide the sealing bottom fitting 88, and a working air chamber can be formed between the bottom fitting 28 and the pressing member 90. is there.

In the above-described embodiment, of the two orifice passages 80 and 86, the cross-sectional area of the passage: A and the length of the passage:
Ratio of L: first orifice passage 86 having a large value of A / L
However, the present invention also relates to a mount device having a single orifice passage, wherein a vibration control characteristic is switched by communicating / blocking the orifice passage, or A plurality of communication ports of the orifice passage to the equilibrium chamber, and opening and closing some of them, thereby changing a flow path area and a flow path length of the orifice passage to control switching of vibration isolation characteristics. Can also be applied advantageously.

Furthermore, the specific shape and structure of the orifice passage are appropriately set in accordance with the anti-vibration characteristics required for the mount and the like, and are not to be construed as being limited by the above embodiment. .

The umbrella fitting 20, the stopper fitting 60, and the like employed in the above embodiment need not necessarily be provided.

Further, the method of manufacturing the mounting device having the structure according to the present invention is not limited to the above-described embodiment. For example, the relative positioning of the diaphragm 42 with respect to the partition member 40 can be determined by the clamp device 13.
6 can be performed after the diaphragm 42 is sucked and held on the partition member 40 by removing the compressive load due to 6, and the mounting device having the structure according to the present invention can be used.
Of course, it is also possible to manufacture by a manufacturing method other than the method of the present invention.

In addition, in the above-described embodiment, a specific example in which the present invention is applied to an engine mount for an automobile has been described. However, the present invention is applicable to various mounting apparatuses for automobiles or other than automobiles. All of them can be advantageously applied.

In addition, although not enumerated one by one, the present invention
Based on the knowledge of those skilled in the art, the present invention can be implemented in a form in which various changes, modifications, improvements, and the like are made.
It goes without saying that all such embodiments are included in the scope of the present invention without departing from the spirit of the present invention.

[0063]

As is apparent from the above description, in the fluid-filled mounting device having the structure according to the present invention, the flexible film and the pressing member are formed as separate parts and are fixed later. Therefore, the flexible film and the pressing member can be formed of different materials to achieve the required characteristics at a high level, and of course, the flexible film can be moved integrally with the pressing member. And communication of the first orifice passage /
The switching of the cutoff state and the like, and hence the switching control of the vibration isolation performance, can be performed extremely stably, and wear due to rubbing or the like at the contact portion between the flexible film and the pressing member is avoided, and excellent durability is exhibited. Because

Further, according to the method of the present invention, the operation of enclosing the fluid in the fluid chamber can be easily performed without suffering the trouble caused by the flexible film and the pressing member being separate parts. The fixing work of the flexible film and the pressing member is also performed by positioning the flexible film by being adsorbed to the partition member.
This makes it possible to perform the mounting easily and quickly, thereby achieving excellent mountability.

[Brief description of the drawings]

FIG. 1 is an explanatory longitudinal sectional view showing an engine mount as one embodiment of the present invention.

FIG. 2 is an explanatory longitudinal sectional view showing a state in which the engine mount shown in FIG. 1 is mounted on an automobile and in which a negative pressure is applied to a working air chamber.

FIG. 3 is a longitudinal sectional view for explaining a method of manufacturing the engine mount shown in FIG. 1 according to the present invention.

FIG. 4 is an explanatory longitudinal sectional view for explaining a process of sealing a fluid in a fluid chamber when manufacturing the engine mount shown in FIG. 1;

[Explanation of symbols]

 REFERENCE SIGNS LIST 10 engine mount 12 first mounting bracket 14 second mounting bracket 16 main rubber elastic body 24 cylindrical fitting 28 bottom fitting 40 partition member 42 diaphragm 46 fluid chamber 54 pressure receiving chamber 56 equilibrium chamber 74 central recess 86 first orifice passage 90 Pressing Member 92 Pressing Fitting 94 Support Rubber Elastic Body 112 Working Air Chamber 116 Fitting Hole 118 Fitting Protrusion

Claims (8)

[Claims] 1. A first mounting member is spaced apart from an opening of a second mounting member having a bottomed cylindrical shape,
The first mounting member and the second mounting member are connected by a rubber elastic body, and the inside of the second mounting member is separated on both sides in the axial direction by a flexible film, and the flexible film is A fluid chamber in which an incompressible fluid is sealed is formed between the fluid chamber and the main rubber elastic body, and a partition member is housed in the fluid chamber and fixedly supported by the second mounting member. ,
On both axial sides of the partition member, a pressure receiving chamber in which a part of the wall is formed by the main rubber elastic body, and an equilibrium chamber in which a part of the wall is formed by the flexible film. A first orifice passage formed between the pressure receiving chamber and the equilibrium chamber, and a bottom portion of the second mounting member opposite to the fluid chamber with the flexible membrane interposed therebetween. On the side, a pressing member positioned opposite to the opening of the first orifice passage with the flexible membrane interposed therebetween and movable in the approach / separation direction with respect to the opening of the first orifice passage is provided. And an urging means for pressing the pressing member against the flexible membrane to close the opening of the first orifice passage with the flexible membrane, and further comprising: A working air chamber is formed by airtightly partitioning the bottom of the second mounting member. A negative pressure control type fluid-filled mounting device in which the pressure of the pressing member against the flexible membrane is released by applying a negative pressure to the working air chamber, and the opening of the first orifice passage is opened. In the above, the flexible film and the pressing member are formed as separate components from each other, and the pressing member and the flexible film adhere to each other at a pressing portion of the pressing member against the flexible film. A negative pressure control type fluid-filled mounting device, characterized in that: 2. The negative pressure control type fluid-filled mounting device according to claim 1, wherein the flexible film and the pressing member are fixed to each other by a shape locking mechanism. 3. The negative-pressure control type fluid-filled mounting device according to claim 1, wherein the flexible film and the pressing member include rubber elastic films made of different materials. 4. The fixing portion of the flexible film to be fixed to the pressing member is positioned relatively to the pressing member by positioning the flexible film with respect to the partition member. 2. The positioning mechanism according to claim 1, further comprising:
4. The negative pressure control type fluid-filled mounting device according to any one of claims 1 to 3. 5. Between the pressure receiving chamber and the equilibrium chamber,
The negative pressure control type fluid filled mount device according to any one of claims 1 to 4, wherein a second orifice passage tuned to a lower frequency range than the first orifice passage is provided. 6. The method of manufacturing the negative pressure control type fluid-filled mounting device according to claim 1, wherein the second mounting member includes a tubular body on an opening side and a bottomed tubular body on a bottom side. And connecting the cylindrical portion to the first mounting member via the main rubber elastic body, and assembling the partition member and the flexible film to the cylindrical portion. A first assembly in which the fluid chamber is formed, and a second assembly in which the working air chamber is formed by assembling the pressing member and the urging means with respect to the bottomed cylindrical body. When the first assembly and the second assembly are assembled separately, the flexible membrane is fixed to the pressing member when the first assembly and the second assembly are assembled. A pre-compression load is applied to a rubber elastic body, and the first assembly and the second assembly During assembly,
By removing the pre-compression load, a negative pressure is generated in the fluid chamber, and the flexible membrane is adsorbed to the partition member to position the flexible membrane. Method. 7. The flexible membrane and the pressing member are fixed to each other by a shape locking mechanism when the first assembly and the second assembly are assembled. 7. The method of manufacturing a negative pressure control type fluid-filled mounting device according to claim 6, wherein a lubricant that disappears by permeation, absorption, volatilization, or the like is applied to at least one of the locking portions of the pressing member and the pressing member. 8. When the first assembly and the second assembly are assembled, when the pre-compression load applied to the main rubber elastic body is removed, the flexible membrane is set to a predetermined position. 8. The method for manufacturing a negative pressure control type fluid-filled mounting device according to claim 6, wherein a suction position of the flexible film with respect to the partition member is determined using a jig that guides the flexible film.