JPH10339350A - Air pressure control type fluid-sealed vibration damping device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To form a connection port of an external air pipe unit for an air passage giving an influence of air pressure by a simple structure and an excellent quality of manufacture, in an air pressure controlled vibration damping device. SOLUTION: A connection port of an external air pipe unit 92 in an air passage 84, positioned to be received in a recessed part 86 provided in a passage forming member 40, in a form without protruding from a peripheral surface of the passage forming member 40 serving as a fitting surface relating to a cylindrical part 34 of a second mounting member 14, is constituted by a pipe member 88 integrally formed to be protruded. In this way, necessity for separately forming the connection port relating to the external air pipe unit 92 assembled in the passage forming member 40 can be eliminated.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a fluid filled type vibration damping device having a fluid chamber filled with an incompressible fluid, and more particularly to an air chamber behind a movable member forming a part of a wall of the fluid chamber. And an air pressure control type fluid-filled type vibration damping device in which vibration damping characteristics are controlled by applying air pressure to the air chamber.

[0002]

2. Description of the Related Art As a kind of a vibration isolating device as a vibration isolating connection body or a vibration isolating support member interposed between members constituting a vibration transmission system, a first mounting attached to a member to be vibration isolatingly connected. The member and the second mounting member are elastically connected by a main rubber elastic body, and a fluid chamber filled with an incompressible fluid is formed, and a part of a wall of the fluid chamber is formed of a movable member. And a sealed air chamber is formed on the opposite side of the fluid chamber with the movable member interposed therebetween, and air pressure is applied to the air chamber to control vibration damping characteristics. Shaking devices are known. Specifically, for example, Japanese Patent Publication No. Hei 6-89803 and
As described in JP-A-118375, etc., a pressure receiving chamber in which a part of a wall is formed by a main rubber elastic body and an internal pressure fluctuation is generated by vibration input, and a wall formed by a rubber elastic film as a movable member. A part of the part is configured to include a balancing chamber having a variable volume, and a fluid chamber is configured, and a fluid flow path that interconnects the pressure receiving chamber and the balancing chamber is formed, while a rubber elastic film is formed. An air chamber is formed on the opposite side of the equilibrium chamber with the air chamber interposed therebetween, and the air chamber is connected / blocked to a negative pressure source to switch the fluid flow path substantially between communication / blocking, thereby switching control of vibration isolation characteristics. 2. Description of the Related Art Conventionally, a mounting device that performs this operation is known.

Further, Japanese Patent Application Laid-Open No. 6-294438 and Japanese Utility Model Application Laid-Open No. 61-191543 disclose a pressure receiving device in which a part of a wall is formed by a rubber elastic body and an internal pressure fluctuation is generated by vibration input. A part of the wall of the chamber is constituted by a movable member, or a part of the wall of the sub liquid chamber communicated with the pressure receiving chamber through a fluid flow path is constituted by a movable member. Vibration is performed by an electromagnetic actuator or the like at an appropriate frequency corresponding to the vibration to be damped, so that the pressure and fluid flow in the fluid chamber are controlled to control the vibration damping characteristics. Although an anti-vibration device has been proposed, in such an anti-vibration device, in order to achieve simplification of the device structure, weight reduction, and compactness, a movable member is used without using an electromagnetic actuator or the like. An air chamber is formed on the opposite side of the main liquid chamber or the sub liquid chamber, and the movable member is vibrated by increasing or decreasing the air pressure of the air chamber, thereby realizing an air pressure control type fluid filled type vibration damping device. It is also possible.

In such an air pressure control type fluid filled type vibration damping device, an air passage for applying air pressure to an air chamber is formed inside the device, and the air passage is connected to an air pressure source. It is necessary to form a connection port for inserting and connecting an air tube such as a tube or the like to the outside of the apparatus. Therefore, conventionally, generally,
JP-B-6-89803 and JP-A-5-1183
As described in Japanese Patent Publication No. 75-75, etc., a cylindrical portion is provided in the second mounting member, and a passage forming member that forms an air passage communicated with the air chamber is press-fitted into the cylindrical portion. Alternatively, the aperture is fitted and fixed by a restrictor, and a window is formed through the cylindrical portion of the second mounting member so that an air passage provided in the passage forming member can be opened to the outside through the window. Thereby, after the passage forming member is fitted and fixed to the cylindrical portion in a fluid-tight manner, the separately formed pipe-shaped connection port is press-fitted and fixed to the opening of the air passage through the window of the cylindrical portion. Structure is adopted.

However, when such a press-fitting and fixing structure for a pipe-shaped connection port is adopted, it is necessary to separately form the pipe-shaped connection port and press-fit and fix it later. This increases the number of parts and the number of manufacturing steps. There is a problem that can not be avoided,
Further, in order to smoothly press-fit the pipe-shaped connection port, when the passage forming member is fitted and fixed to the cylindrical portion of the second mounting member, the opening of the air passage in the passage forming member is formed in the cylindrical portion. There is also a problem that the productivity is poor because it is necessary to align the window with high precision. Moreover, in order to press-fit the pipe-shaped connection port with sufficient attachment strength, a certain strength is required for the passage forming member, so that there is also a problem that it is extremely difficult to convert the passage forming member into a resin or the like.

[0006] In order to meet the requirement of the passage-forming member being made of resin, etc., a separately formed pipe-shaped connection port is brazed to a window provided in the cylindrical portion of the second mounting member. Although it is conceivable that the pipe-shaped connection port is separately formed and brazed, it is unavoidable that the number of parts and the number of manufacturing steps are increased. In addition, there is a problem that the manufacturability is poor because high-precision alignment between the opening of the air passage in the passage forming member and the window of the cylindrical portion is required. In addition, since the pipe-shaped connection port is brazed to the cylindrical portion, it becomes extremely difficult to draw the cylindrical portion. Therefore, the sealing property between the passage forming member and the fitting surface of the cylindrical portion is reduced. There is also a problem that it is difficult to secure the steel by drawing.

[0007]

The present invention has been made in view of the above-mentioned circumstances, and an object of the present invention is to provide an air passage for applying air pressure to an air chamber, such as a tube. It is an object of the present invention to provide an air pressure control type fluid-filled type vibration damping device in which a connection port for inserting and connecting an external air pipe is formed with a small number of parts and a simple structure.

[0008]

In order to solve such a problem, a feature of the invention according to claim 1 is that a first mounting member and a second mounting member which are respectively mounted on members to be vibration-isolated and connected. Are elastically connected by a main rubber elastic body, and a fluid chamber in which an incompressible fluid is sealed is formed, and a part of a wall of the fluid chamber is formed by a movable member, and the movable member is An air pressure control type fluid filled type vibration damping device in which a sealed air chamber is formed on the opposite side of the fluid chamber with the air chamber interposed therebetween to control vibration damping characteristics by applying air pressure to the air chamber. A tubular portion is provided on the second mounting member, and a passage forming member forming an air passage communicated with the air chamber is fitted and fixed to the tubular portion by press-fitting or restricting, and assembled. The tube is formed with respect to the passage forming member. A recess is formed in the outer peripheral surface fitted and fixed to the portion, and a pipe portion communicated with the air passage is formed at a central portion of the recess at a height lower than the depth of the recess. The connection port of the air pipe that exerts air pressure on the air chamber is formed by integrally forming the pipe section by projecting outward and exposing the pipe section to the outside through a window provided in the cylindrical section. is there.

In the air pressure control type fluid filled type vibration damping device having the structure according to the first aspect of the present invention,
Since the pipe portion as a connection port of the air pipe to the air passage is integrally formed by the passage forming member, the number of parts and the manufacturing process are reduced, so that the structure is simplified and the productivity is advantageously improved. Is done. Further, the window formed in the tubular portion can be set sufficiently larger than the pipe portion, thereby alleviating the positioning accuracy when the passage forming member is fitted and fixed to the tubular portion. Therefore, further improvement in manufacturability can be achieved.
Furthermore, since the concave portion is formed around the pipe portion, the workability of connecting an air tube such as a tube to the pipe portion can be sufficiently ensured. Further, since the pipe portion is formed in a state of being housed in the recess, there is also an advantage that damage to the pipe portion can be advantageously prevented during a manufacturing operation, transportation, or the like of the vibration isolator. Moreover, since the pipe portion is formed in a state housed in the recess, the passage forming member is press-fitted into the tubular portion and the passage forming member is inserted into the tubular portion, and then the throttle is pressed against the tubular portion. In such a case, it is possible to perform such press-fitting and squeezing with good workability without being in the way.
Thereby, the fluid tightness between the fitting surfaces of the passage forming member and the cylindrical portion can be advantageously and stably secured.

The movable member is a member which can be deformed or displaced and partitions the fluid chamber and the air chamber in a fluid-tight manner. Urged by an elastic body such as a coil spring can be adopted. Further, a seal layer made of a rubber film or the like is interposed between the fitting surfaces of the passage forming member and the cylindrical portion, if necessary, while being pressed between the fitting surfaces.

By the way, in the invention according to claim 1,
The material of the passage forming member is not particularly limited, and a metal passage forming member such as an aluminum alloy or the like can be adopted. In particular, the passage forming member is formed of a synthetic resin material. A passage forming member is preferably employed. That is,
A pipe portion as a connection port of the air pipe to the air passage is integrally formed with the passage forming member, and it is necessary to press-fit and fix a separately formed pipe-shaped connection port to the passage forming member as in the conventional structure. In addition, since the strength required for the passage forming member can be small, a light-weight passage forming member made of a synthetic resin material which is excellent in manufacturing and low in cost can be suitably adopted.

According to a third aspect of the present invention, in the air pressure control type fluid-filled type vibration damping device according to the first or second aspect, the fluid chamber is a rubber elastic body and a part of a wall portion is formed. A main liquid chamber that is configured to cause internal pressure fluctuations due to vibration input, and a sub liquid chamber in which a part of a wall is formed by the movable member, and the sub liquid chamber is A fluid passage communicating with the main liquid chamber is formed.

In the vibration damping device having the structure according to the third aspect of the present invention, the vibration damping is performed based on the flow action of the sealed fluid through the fluid flow path between the main liquid chamber and the sub liquid chamber. The effect is exhibited. By controlling the pressure of the air chamber and controlling the flow state of the fluid through the fluid flow path, the vibration control characteristics can be switched and controlled. In this case, the secondary liquid chamber is configured such that, for example, the movable member is formed of a flexible film that is easily deformed, so that the volume change is easily allowed under a state where the air chamber is connected to the atmosphere, In a state where the air chamber is connected to the negative pressure source, the movable member can be formed as an equilibrium chamber in which the volume change is prevented by the negative pressure suction of the movable member. By substantially switching the flow path between the communication state and the cutoff state, switching control of the vibration isolation characteristics can be performed. In addition, the auxiliary liquid chamber is configured such that, for example, the movable member is constituted by a vibrating plate that is vibrated by a pressure fluctuation applied to the air chamber, so that a pressure that can be adjusted based on the vibration of the vibrating plate is provided. It is possible to form a control chamber, if such a sub-liquid chamber is adopted, by controlling the internal pressure of the sub-liquid chamber according to the input vibration, to control the fluid flow through the fluid flow path, or By controlling the internal pressure of the main liquid chamber through the fluid flow path, the anti-vibration characteristics can be switched and controlled.

The invention according to claim 1 or 2 can be applied to a device different from a fluid-filled type vibration damping device having a structure according to the invention described in claim 3. A fluid chamber including a main liquid chamber in which the internal pressure fluctuation is generated at the time of vibration input, and another part of the wall of the main liquid chamber is extended to the air chamber. The movable member composed of a vibrating plate that is vibrated by the pressure fluctuation caused by the vibration of the movable member directly controls the internal pressure of the main liquid chamber based on the vibration of the movable member so as to adjust the vibration-proof characteristics. The present invention is also applicable to a fluid filled type vibration damping device having the above structure.

Further, the invention according to claim 4 is based on claim 1.
4. In the air pressure control type fluid-filled type vibration damping device according to any one of to 3, the second mounting member has a cylindrical shape, so that the second mounting member itself forms the cylindrical portion. The one axial side of the second mounting member is fixed to the main rubber elastic body and is fluid-tightly closed, and the other axial side is fluid-tightly closed by a flexible film. Thus, while the fluid chamber is formed inside the second mounting member, the passage forming member is inserted and fitted and fixed in the second mounting member, thereby forming the passage forming member. On both sides in the axial direction, a main liquid chamber in which a part of the wall is formed of the main rubber elastic body and an internal pressure fluctuation is generated by vibration input, and a part of the wall is formed of the flexible film Equilibrium chamber in which the volume change is allowed by the deformation of the flexible membrane The main liquid chamber and the equilibrium chamber are formed so as to communicate with each other through an orifice passage, and a sub liquid chamber in which a part of a wall portion is formed of the movable member inside the passage forming member; A fluid flow path communicating the sub liquid chamber with the main liquid chamber, and the air chamber positioned on the opposite side to the sub liquid chamber across the movable member are formed, respectively. And

In the vibration damping device having the structure according to the fourth aspect of the present invention, the main liquid chamber, the equilibrium chamber and the orifice passage, and the auxiliary liquid chamber and the fluid passage are utilized by making good use of the passage forming member. Are advantageously formed with a simple structure and a small number of parts. And, the fluid action such as the resonance action of the fluid caused to flow through the orifice passage between the main liquid chamber and the equilibrium chamber, and the fluid action of the fluid caused to flow through the fluid flow path between the main fluid chamber and the sub fluid chamber. The anti-vibration effect is exerted on the basis of this, and in particular, by controlling the pressure of the air chamber and controlling the flow state of the fluid through the fluid flow path, the anti-vibration characteristics can be switched and controlled. .

Further, in this case, similarly to the invention according to the third aspect, the auxiliary liquid chamber is formed by, for example, a movable member made of a flexible film which is easily deformed, so that the air chamber is connected to the atmosphere. While the volume change is easily permitted under the condition, the movable member is formed as a second equilibrium chamber in which the volume change is prevented by restricting the movable member by the negative pressure suction in a state where the air chamber is connected to the negative pressure source. When such a sub liquid chamber is employed, the vibration control characteristic can be switched and controlled by substantially switching the fluid flow path between the communication state and the cutoff state. In addition, the auxiliary liquid chamber is configured such that, for example, the movable member is constituted by a vibrating plate that is vibrated by a pressure fluctuation applied to the air chamber, so that a pressure that can be adjusted based on the vibration of the vibrating plate is provided. It is possible to form a control chamber, if such a sub-liquid chamber is adopted, by controlling the internal pressure of the sub-liquid chamber according to the input vibration, to control the fluid flow through the fluid flow path, or By controlling the internal pressure of the main liquid chamber through the fluid flow path, the anti-vibration characteristics can be switched and controlled.

The invention according to any one of claims 1 to 3 can also be applied to a device different from a fluid-filled type vibration damping device having a structure according to the invention described in claim 4. A cylindrical fluid in which a first mounting member and a second mounting member are constituted by a shaft member and an outer cylindrical member which are spaced apart in a radial direction, and a main rubber elastic body is interposed between their radially opposed surfaces. The present invention can also be applied to an enclosed vibration isolator or the like.
In this case, in addition to forming the outer tubular member itself as a tubular portion, a tubular portion protruding on the outer peripheral surface of the outer tubular member may be provided integrally or by a separate bracket or the like.

[0019]

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.

First, FIG. 1 shows an engine mount 10 as one embodiment of the present invention. The engine mount 10 has a structure in which a first mounting bracket 12 and a second mounting bracket 14, which are disposed to face each other at a predetermined distance from each other, are elastically connected by a main rubber elastic body 16. The first mounting bracket 12 is mounted on the power unit side and the second mounting bracket 14 is mounted on the body side, so that the power unit is supported on the body with vibration isolation. In the engine mount 10, the power unit load and vibration damping are performed in a direction substantially opposite to the first mounting bracket 12 and the second mounting bracket 14 (substantially up and down direction in FIG. 1) when mounted on the vehicle. Expected vibrations are respectively input, and the main rubber elastic body 16 is compressed and deformed by a predetermined amount by the load of the power unit. In the following description, the up-down direction refers to the up-down direction in FIG. 1 in principle.

More specifically, the first mounting member 12 has a substantially circular solid block shape extending in the up-down direction, and a plate-like stopper extending radially outward is provided at an intermediate portion in the axial direction. The part 18 is integrally formed. Further, the first mounting bracket 12 has a lower portion in the axial direction than the stopper portion 18,
While the holding portion 20 has an inverted truncated cone shape whose diameter gradually decreases downward, a bolt hole 22 extending in the axial direction is provided in a portion axially above the stopper portion 18. The first mounting bracket 12 is provided with the bolt holes 2.
2 is fixedly attached to a power unit (not shown) by an attachment bolt screwed to the power unit 2.

A rubber elastic body 16 is bonded to the first mounting member 12 by vulcanization. Body rubber elastic body 16
Has a large diameter substantially frustoconical shape as a whole, and is provided with a recess 24 which is open at the large diameter side end face. And
The holding portion 20 of the first mounting member 12 is vulcanized and bonded to the small-diameter end portion of the main rubber elastic body 16 while being inserted in the axial direction. A cylindrical connecting fitting 26 is vulcanized and bonded to the outer peripheral surface of the large-diameter end of the main rubber elastic body 16.

The stopper 1 of the first mounting member 12
An annular cushion rubber 28 protruding upward in the axial direction is formed integrally with the main rubber elastic body 16 in the body 8. Then, the stopper portion 1 is provided through the cushion rubber 28.
When the power unit 8 is brought into contact with a body-side contact portion (not shown), the relative displacement of the power unit with respect to the body is limited.

On the other hand, the second mounting member 14 has a large-diameter portion 32 on the upper side in the axial direction and a small-diameter portion 34 on the lower side in the axial direction with the step portion 30 formed in the middle portion in the axial direction interposed therebetween. Has a stepped large diameter cylindrical shape, and is fixedly attached to the body side of the vehicle via a bracket (not shown). A thin seal rubber layer 36 is provided on substantially the entire inner surface of each of the large-diameter portion 32 and the small-diameter portion 34, while the seal rubber layer 36 is provided on the opening on the small-diameter portion 34 side. Easily deformable thin rubber elastic film 3 as a flexible film integrally formed with
8 is provided, and the opening on the small diameter portion 34 side is closed in a fluid-tight manner by the rubber elastic film 38.

The large-diameter portion 3 of the second mounting member 14
2 is externally inserted into the connection fitting 26 and the large-diameter portion 32 is subjected to drawing or the like, so that the large-diameter portion 32 is externally fixed to the connection fitting 26 in a fluid-tight manner. Thus, the first mounting member 12 and the second mounting member 14 are elastically connected by the main rubber elastic body 16. The opening of the second mounting member 14 on the large diameter portion 32 side is covered with the main rubber elastic body 16 in a fluid-tight manner, so that the main rubber elastic body 16 inside the second mounting bracket 14 is provided. A fluid chamber in which a predetermined incompressible fluid is sealed is formed between the opposing surfaces of the rubber elastic film 38. In order to effectively obtain an anti-vibration effect based on the resonance action of the fluid, water or a low-viscosity fluid such as alkylene glycol, polyalkylene glycol, or silicone oil having a viscosity of 0.1 Pa · s or less is used as the sealed fluid. Adopted advantageously.

Further, the small-diameter portion 34 of the second mounting member 14
A partition member 40 as a passage forming member having a substantially circular block shape as a whole is inserted and arranged, and the small-diameter portion 34 is drawn, so that the partition member 40 is moved with respect to the inner peripheral surface of the small-diameter portion 34. It is fitted and fixed in a fluid-tight manner. The fluid chamber formed inside the second mounting member 14 is partitioned on both sides in the axial direction by the partition member 40. The main liquid chamber 42 is formed of a main rubber elastic body 16 in which an internal pressure change is caused based on the elastic deformation of the main rubber elastic body 16 at the time of vibration input. On the side, a part of the wall is a rubber elastic film 38.
Is formed, and an equilibrium chamber 44 in which a change in volume is easily allowed based on the deformation of the rubber elastic film 38 is formed.

Here, the partitioning member 40 includes a substantially cylindrical bottomed outer wall member 48 provided with a central recess 46 which is opened at the center of the upper end face in the axial direction. A rubber elastic plate 50 as a movable member is accommodated and arranged at the bottom of the central recess 46, and a thick disk-shaped lid member 52 is fitted and fixed in the opening of the central recess 46, thereby opening the central recess 46. The portion is covered with a cover member 52. The partition member 40 is inserted into the second mounting member 14 from the large-diameter portion 32 side, and the outward flange portion 53 integrally formed on the opening side peripheral portion of the outer wall member 48 has the second direction. The small-diameter portion 34 of the second mounting member 14 is positioned on the second mounting member 14 by being superposed on the step portion 30 of the mounting member 14 and sandwiched between the main rubber elastic body 16.
The outer peripheral surface of the partition member 40 is pressed against the inner peripheral surface of the small-diameter portion 34 with the seal rubber layer 36 interposed therebetween by being subjected to a drawing process such as an eight-way drawing to reduce the diameter.
It is fitted and fixed in a fluid-tight manner.

The outer wall member 48 is formed with a concave groove 56 which is open to the outer peripheral surface and extends a predetermined length in the circumferential direction. The concave groove 56 is formed in the small-diameter portion 34 of the second mounting member 14. The two ends are connected to the main liquid chamber 42 and the equilibrium chamber 44 through the communication holes 60 and 62, respectively, so that the two chambers 42 and 44 communicate with each other, and the internal pressure between the two chambers 42 and 44 is increased. An orifice passage 58 that allows fluid flow between the two chambers 42 and 44 based on the difference is formed. In addition,
In the present embodiment, the length of the orifice passage 58 and the length of the orifice passage 58 are adjusted so that an effective vibration damping effect against vibration in a low frequency range such as a shake is exhibited based on the resonance action of the fluid caused to flow through the orifice passage 58. The cross-sectional area and the like are set.

On the other hand, the rubber elastic plate 50 housed and arranged in the partition member 40 has a substantially disc shape, and its outer peripheral portion is slightly thinned and inclined obliquely downward in the axial direction. In addition, an annular fitting ring 66 is fixed to the outer peripheral surface by vulcanization bonding or the like. The rubber elastic plate 50 is spread in the direction perpendicular to the axis at the bottom of the central concave portion 46 by the fitting ring 66 being press-fitted into the central concave portion 46 of the outer wall member 48 and being fluid-tightly fitted and fixed. In addition, it is located at a predetermined distance from the bottom surface of the central concave portion 46 based on its own elasticity, and is arranged in a state where elastic deformation is allowed.

The central concave portion 46 of the outer wall member 48 in which the rubber elastic plate 50 is accommodated and arranged as described above,
In the central concave portion 46 between the rubber elastic plate 50 and the opposing surface of the lid member 52,
A sub liquid chamber 70 in which the same incompressible fluid as the main liquid chamber 42 and the equilibrium chamber 44 is sealed is formed. The sub liquid chamber 70 is allowed to change in volume based on the elastic deformation of the rubber elastic plate 50.

The cover member 52 is formed with a circumferential groove 72 which is open to the outer peripheral surface and extends in the circumferential direction.
2 is covered by the peripheral wall portion 68 of the outer wall member 48, both ends are connected to the main liquid chamber 42 and the sub liquid chamber 70 through the communication holes 74 and 76, respectively, and the two chambers 42 and 70 communicate with each other. A fluid passage 78 allowing fluid flow between the two chambers 42 and 70 based on the internal pressure difference between the two chambers 42 and 70.
Are formed. In the present embodiment, based on the resonance action of the fluid caused to flow through the fluid flow path 78, the fluid flow is controlled so as to exhibit an effective vibration damping effect against high frequency vibrations such as idle vibration. The length, cross-sectional area, etc. of the path 78 are set.

On the other hand, at the bottom of the central recess 46, which is located on the opposite side of the auxiliary liquid chamber 70 across the rubber elastic plate 50, the central recess 46 is fluid-tightly partitioned by the rubber elastic plate 50. As a result, a working air chamber 80 is formed as an air chamber that is sealed from the external space. Further, the bottom wall portion 82 of the outer wall member 48 is sufficiently thick, penetrates the inside of the bottom wall portion 82, extends through the outer peripheral surface in the radial direction, and has an opening at the bottom surface of the central concave portion 46. Working air chamber 8
Air supply / discharge passage 84 as an air passage communicated with zero
Are formed.

Then, under the state of mounting on a car,
An external air pipe 92 is connected to the air supply / discharge path 84, and the air pipe 92 allows the working air chamber 80 to be selectively connected to the negative pressure source 96 and the atmosphere via a switching valve 94. The connection is made. Accordingly, by switching the switching valve 94 in such a mounted state, the anti-vibration characteristics of the engine mount 10 can be switched and controlled.

That is, when the working air chamber 80 is connected to the atmosphere, the rubber elastic plate 50 is held in a state in which elastic deformation is allowed based on its own elastic force or the like. When a negative pressure is applied to the chamber 80, the rubber elastic plate 50 is deformed and displaced downward (toward the working air chamber 80) against the elastic force by the negative pressure suction force applied to the lower surface of the rubber elastic plate 50. By being held down and being attracted to the bottom surface of the central concave portion 46, the locked state where elastic deformation is not allowed is maintained. Therefore, the working air chamber 80
Is connected to the atmosphere, the volume change of the sub-liquid chamber 70 is allowed based on the elastic deformation of the rubber elastic plate 50, so that the fluid flow path between the main liquid chamber 42 and the sub-liquid chamber 70 78
Fluid flow is generated through, the vibration damping effect based on the flow action of such fluid, that is, the excellent vibration damping effect against the vibration in the high frequency range is effectively exhibited,
Under a state where the working air chamber 80 is connected to the negative pressure source 96, the rubber elastic plate 50 is restrained and the volume of the auxiliary liquid chamber 70 is invariable, so that the fluid flow path 78 is substantially shut off. Fluid flow through the orifice passage 58 between the main liquid chamber 42 and the equilibrium chamber 44 is effectively generated, and an excellent vibration damping effect based on the flow action of the fluid, that is, excellent vibration in a low frequency range. The anti-vibration effect is effectively exhibited, and the mount anti-vibration characteristics can be switched. As is apparent from this, in the present embodiment, the main liquid chamber 42, the equilibrium chamber 44, and the sub liquid chamber 70 are included.
A fluid chamber in which an incompressible fluid is sealed is formed.

Here, the outer wall member 48 having an air supply / discharge passage 84 for applying air pressure to the working air chamber 80 is formed.
A circular recess 86 is formed on the outer peripheral surface of the air supply / discharge passage 84 at the portion where the opening is formed. As a result, the opening of the air supply / discharge passage 84 is formed into a pipe-shaped pipe portion 88 projecting from the bottom surface of the recess 86 toward the opening at the central portion in the recess 86, and the outer wall member 4 is formed.
8 are integrally formed. In addition, the pipe portion 88 is formed to have the same height as the depth of the recess 86 or a projection height smaller than the depth, and is set so as to be accommodated in the recess 86 and not project from the outer peripheral surface of the outer wall member 48. ing.

Further, the small diameter portion 34 of the second mounting member 14
Has a window 90 penetrating in the radial direction at a position corresponding to the opening of the recess 86.
Through, the pipe portion 88 is exposed to the external space. Thereby, as shown by a virtual line in the figure,
The external air tube 92 is inserted into the recess 86 from the window 90 and is inserted and fitted on the outer peripheral surface of the pipe portion 88, thereby connecting the external air tube 92 to the air supply / discharge passage formed in the outer wall member 48. 84 can be connected.

That is, in the air supply / discharge path 84, the pipe portion 8 formed integrally with the partition member 40 (outer wall member 48).
If the opening structure of the air supply / discharge path 84 composed of 8 is adopted,
There is no need to separately form and assemble a connection port for connecting the external air pipe 92 to the air supply / discharge path 84,
Since the number of parts and the number of manufacturing steps are reduced, the intended air pressure control type fluid-filled vibration damping device can be advantageously realized with a simple structure and excellent manufacturability.

Further, since the outer wall member 48 is not required to have a press-fitting strength when assembling the separately formed connection port, the outer wall member 48 can be made of a synthetic resin material. As a result, it is possible to extremely advantageously achieve an improvement in manufacturing and manufacturing, a reduction in the weight and cost of the mount, and the like.

In addition, the pipe portion 8 of the outer wall member 48
8 is formed so as not to protrude from the outer peripheral surface of the partition member 40, so that the operation of inserting the partition member 40 into the second mounting bracket 14 and the subsequent drawing work on the second mounting bracket 14, etc. Therefore, it is possible to secure a highly stable fluid tightness at the fitting surface between the partition member and the second mounting member 14 by drawing the second mounting member 14. Becomes easier,
Even better manufacturability is achieved.

In addition, since the pipe portion 88 is formed so as to be completely housed in the concave portion 86, an action of an external force due to contact with other members or the like during transportation of the mount or the like. It is possible to avoid the damage and effectively prevent the damage. In addition, even in the mounted state, the gap between the outer peripheral surface of the air pipe 92 and the inner peripheral surface of the recess 86 is appropriately set, and By limiting the amount of deformation of the pipe 88, it is possible to prevent the pipe 88 from being lost.

As described above, one embodiment of the present invention has been described in detail, but this is a literal example.
It is not to be construed that the invention is limited only to such specific examples.

For example, the tuning of the fluid flow path 78 and the like can be appropriately changed according to the required characteristics of the vibration isolator, and is not limited at all. In particular,
For example, in the above-described embodiment, it is possible to tune the orifice passage 58 to idling vibration or the like, and to tune the fluid flow passage 78 to a muffled sound in a higher frequency range.

Further, the second elastic fitting 14 has a structure in which a separately formed rubber elastic film 38 is post-fixed to the opening on the side of the small diameter portion 34 of the second elastic fitting 14 so as to close it, so that the second elastic fitting 14 can be closed. On the other hand, it is also possible to insert the partition member 40 from the small-diameter portion 34 side and assemble it. When such a structure is adopted, the second mounting bracket 14 is connected to the connecting metal fitting 26 at the large-diameter portion 32. Without going through
It is also possible to directly perform vulcanization bonding to the main rubber elastic body 16.

Further, in the engine mount 10 in the above-described embodiment, the mount anti-vibration characteristic is controlled by substantially communicating / blocking the fluid flow path 78. It is also possible to control the vibration isolation characteristics of the vibration isolation device by increasing or decreasing the air pressure of the chamber and exciting the movable member forming a part of the wall of the fluid chamber at an appropriate frequency. Specifically, for example, in the engine mount 10 shown in the above embodiment, the switching valve 94 is switched according to the frequency of the input vibration or the like to increase or decrease the pressure of the working air chamber 80, and Can be vertically reciprocated (vibrated) by the suction force of the negative pressure in the working air chamber 80 and the restoring force based on the elasticity of the rubber elastic plate 50 itself. By vibrating, the sub liquid chamber 70
Can be controlled. Therefore, at the time of vibration input, the rubber elastic plate 50 is vibrated at a frequency corresponding to the input vibration to cause an internal pressure fluctuation in the sub-liquid chamber 70, whereby the sub-liquid chamber 7
Fluid flow through the fluid flow path 78 between the fluid chamber 0 and the main liquid chamber 42 is positively generated, and a vibration damping effect using a fluid action such as a resonance action of the fluid or an internal pressure of the main liquid chamber 42 is obtained. The anti-vibration effect based on the control is extremely effectively exerted. The magnitude and phase of the air pressure exerted on the working air chamber 80 to vibrate the rubber elastic plate 50 are determined by the main liquid chamber 42.
By controlling in accordance with the input vibration while taking into account the delay time of the pressure transmission to the mount, the mount anti-vibration characteristics can be switched and controlled. As the control method,
For example, any of feedback control such as adaptive control for minimizing an error signal, map control based on a predetermined set value, and the like can be adopted.

If such a vibrating structure of the movable member by air pressure is adopted, there is no need to incorporate an actuator member such as an electromagnetic driving means into the vibration isolator itself, so that the structure is extremely simple and easy to manufacture. There is a great advantage that a fluid-filled type vibration damping device having an active vibration damping function is lightweight, compact and inexpensive. Durability and reliability are higher than when electromagnetic drive means are incorporated. Also, there is an advantage that it is easy to deal with the trouble even if it breaks down.

When the vibrating structure of the movable member by the air pressure is employed, for example, a part of the wall is made of a rubber elastic body so that the internal pressure fluctuates at the time of vibration input. Is composed of a rubber elastic plate, and the rubber elastic plate is vibrated based on the air pressure fluctuation of the air chamber formed behind the rubber elastic plate, thereby exerting a pressure change directly on the main liquid chamber, It is also possible to control the vibration isolation characteristics. Specifically, for example, in the above-described embodiment, the upper surface of the rubber elastic plate 50 is formed by forming the main liquid chamber 42 including the inside of the central concave portion 46 of the outer wall member 48 without providing the lid member 52. By directly exposing the main liquid chamber 42 to the main liquid chamber 42 by vibrating the rubber elastic plate 50, the pressure can be directly exposed to the chamber 42.

Further, in the above embodiment, the equilibrium chamber 4 communicated with the main liquid chamber 42 through the orifice passage 58.
4 was provided, but such an orifice passage 58
It is also possible to configure a vibration isolator without providing the balance chamber 44.

In the above-described embodiment, a specific example is shown in which the present invention is applied to a vibration isolator having a structure in which the first mounting member and the second mounting member are opposed to each other in only one direction. In addition, according to the present invention, a first mounting member and a second mounting member are configured by a shaft member and an outer cylinder member disposed at a predetermined distance radially outward of the shaft member. By interposing a rubber elastic body between the shaft member and the radially opposed surfaces of the cylindrical member, it is suitable as an engine mount, body mount, suspension bush, or the like for an FF type automobile, which is formed in a cylindrical shape as a whole. The present invention is also applicable to a fluid-filled type vibration isolator used.

In addition, in the above-described embodiment, a specific example in which the present invention is applied to an automobile engine mount is shown. However, the present invention is also applicable to an automobile body mount, a differential mount, or various devices other than an automobile. It goes without saying that any of them can be similarly applied to the anti-vibration device and the like.

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

[0051]

As is apparent from the above description, in the fluid filled type vibration damping device having the structure according to the present invention, an external pressure is applied to the air passage for controlling the vibration damping characteristics by applying air pressure to the air chamber. Since the connection port of the air pipe is constituted by a pipe part integrally protruded in the recess of the passage forming member in which the air passage is formed, the connection port of the external air pipe is formed separately. It is not necessary to assemble to the forming member, the number of parts and the number of manufacturing steps are reduced, and the intended air pressure control type fluid-filled vibration isolator is
It can be advantageously realized with a simple structure and excellent manufacturability.

Further, such a pipe portion is accommodated in a recess provided in the passage forming member, and does not protrude from the outer peripheral surface of the passage forming member which is a fitting surface of the second mounting member to the cylindrical portion. Since it is formed in the form, the pipe portion does not hinder the assembling workability by press-fitting, drawing, or the like of the passage-forming member into the cylindrical portion of the second mounting member, so that the production is more excellent. The nature is exhibited.

[Brief description of the drawings]

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

[Explanation of symbols]

 Reference Signs List 10 engine mount 12 first mounting bracket 14 second mounting bracket 16 main rubber elastic body 40 partitioning member 42 main liquid chamber 50 rubber elastic plate 70 sub liquid chamber 78 fluid flow path 80 working air chamber 84 air supply / discharge passage 86 concave Place 88 Pipe part 90 Window part 92 Air tube

Claims (4)

[Claims] 1. A fluid chamber in which a first mounting member and a second mounting member, which are respectively mounted on members to be vibration-isolated and connected, are elastically connected by a rubber elastic body and a non-compressible fluid is sealed. On the other hand, a part of the wall portion of the fluid chamber is formed of a movable member, and an air chamber sealed on the opposite side of the fluid chamber with the movable member therebetween is formed. In an air pressure control type fluid-filled type vibration damping device that controls vibration damping characteristics by applying air pressure, a tubular portion is provided in the second mounting member, and an air passage communicated with the air chamber is provided. The channel forming member to be formed is fitted and fixed to the cylindrical portion by press-fitting or restricting, and the concave portion opened to the outer peripheral surface fitted and fixed to the cylindrical portion with respect to the channel forming member. At the center of the recess. A pipe portion communicated with the air passage is integrally formed by projecting outward at a height lower than the depth of the recess, and the pipe portion is formed through a window provided in the cylindrical portion. By exposing to the outside,
An air pressure control type fluid filled type vibration damping device, wherein a connection port of an air pipe body that exerts air pressure on the air chamber is formed. 2. The air pressure control type fluid filled type vibration damping device according to claim 1, wherein the passage forming member is formed of a synthetic resin material. 3. A main liquid chamber in which a part of a wall portion is formed by the main rubber elastic body and the internal pressure is changed by vibration input, and a part of the wall portion by the movable member. 3. A pneumatically-controlled fluid filling according to claim 1, wherein a fluid passage for communicating the sub-liquid chamber with the main liquid chamber is formed. Type anti-vibration device. 4. The cylindrical shape of the second mounting member, the cylindrical portion being constituted by the second mounting member itself, and one opening in the axial direction of the second mounting member. The other side in the axial direction is fluid-tightly closed by a flexible film while the other side is fixed to the main rubber elastic body and is fluid-tightly closed. While the fluid chamber is formed, the passage forming member is inserted and fitted and fixed to the second mounting member, so that a part of the wall portion is formed on both axial sides of the passage forming member. A main liquid chamber formed of the main rubber elastic body and causing internal pressure fluctuation due to vibration input; and a part of a wall portion formed of the flexible film, and a volume change is allowed by deformation of the flexible film. An equilibrium chamber is formed, and the main liquid chamber and the equilibrium chamber are connected to the orifice passage. And a fluid passage that communicates with the main liquid chamber through a sub-liquid chamber in which a part of the wall is formed of the movable member inside the passage forming member. 4. The air-pressure-controlled fluid-filled protection device according to claim 1, wherein the air chamber positioned on the opposite side of the auxiliary liquid chamber with the movable member therebetween is formed. Shaking device.