JP3487129B2 - Pneumatic control type fluid filled type vibration damping device - Google Patents

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 provided with a fluid chamber in which an incompressible fluid is filled, and more particularly to an air chamber behind a movable member forming a part of a wall of the fluid chamber. The present invention relates to an air pressure control type fluid-filled type vibration damping device in which a vibration damping characteristic is controlled by forming an air pressure in the air chamber.

[0002]

BACKGROUND ART As a kind of a vibration isolation device such as a vibration isolation connector or an anti-vibration support member interposed between members constituting a vibration transmission system, a first attachment attached to a member to be vibration-isolated and coupled. The member and the second mounting member are elastically connected to each other by a rubber elastic body, and a fluid chamber in which an incompressible fluid is enclosed is formed, while a part of a wall portion of the fluid chamber is configured by a movable member. At the same time, an air chamber is formed on the opposite side of the fluid chamber with the movable member sandwiched between them, and the vibration control characteristics are controlled by exerting air pressure on the air chamber. Shaking devices are known. Specifically, for example, Japanese Patent Publication No. 6-89803 and Japanese Unexamined Patent Publication No.
As described in Japanese Patent No. 118375 and the like, a wall is formed by a rubber elastic film as a movable member and a pressure receiving chamber in which a part of a wall portion is constituted by a main rubber elastic body, and an internal pressure fluctuation is caused by a vibration input. A fluid chamber is formed by including an equilibrium chamber of which the volume is variable by forming a part of the portion, and a fluid flow path that connects the pressure receiving chamber and the equilibrium chamber to each other is formed. An air chamber is formed on the side opposite to the equilibrium chamber, and the air chamber is connected / disconnected to a negative pressure source to substantially switch the fluid flow path between communication / interruption. A mounting device configured to do so is conventionally known.

Further, in Japanese Patent Laid-Open No. 6-294438 and Japanese Utility Model Laid-Open No. 61-191543, a part of the wall portion is constituted by a rubber elastic body, and internal pressure fluctuation is caused by vibration input. A part of the wall portion of the chamber is formed of a movable member, or a part of the wall portion of the auxiliary liquid chamber that is communicated with the pressure receiving chamber through a fluid flow path is formed of a movable member. An electromagnetic fluid actuator is used to excite the vibration at an appropriate frequency corresponding to the vibration to be isolated, so that the pressure and fluid flow inside the fluid chamber can be controlled to control the vibration isolation characteristics. Although an anti-vibration device has been proposed, in such an anti-vibration device, in order to achieve simplification, weight reduction and downsizing of the device structure, a movable member is used without using an electromagnetic actuator or the like. Therefore, an air chamber is formed on the side opposite to the main liquid chamber or the sub liquid chamber, and the air pressure in the air chamber is increased or decreased to vibrate the movable member, thereby realizing an air pressure control type fluid filled type vibration damping device. It is also possible.

By the way, in such an air pressure control type fluid filled type vibration damping device, an air passage for exerting an air pressure to the 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 to the outside of the device. So, in the past, in general,
JP-B-6-89803 and JP-A-5-1183.
As described in Japanese Patent Laid-Open No. 75-75, etc., a passage forming member, which is provided with a tubular portion on the second mounting member and forms an air passage communicated with the air chamber, is press-fitted into the tubular portion. Or, by fitting and fixing with a throttle, and assembling, a window portion is provided through the tubular portion of the second mounting member, and the air passage provided in the passage forming member can be opened to the outside through this window portion. Thus, after the passage forming member is fluid-tightly fitted and fixed to the tubular portion, the separately formed pipe-shaped connection port is press-fitted and fixed to the opening of the air passage through the window portion of the tubular portion. The following structure is adopted.

However, if such a press-fitting and fixing structure of the pipe-shaped connection port is adopted, it is necessary to separately form the pipe-shaped connection port and press-fit and fix it later, so that the number of parts and the number of manufacturing steps increase. There is a problem that can not be avoided,
Further, in order to smoothly perform the press-fitting work of the pipe-shaped connection port, when the passage forming member is fitted and fixed to the tubular portion of the second mounting member, the opening portion of the air passage in the passage forming member is tubular. There is also a problem in that the manufacturability is poor because the window part of must be aligned with high accuracy. Moreover, in order to press-fit the pipe-shaped connection port with sufficient attachment strength, the passage forming member is required to have a certain strength, and therefore there is a problem that it is extremely difficult to resinize the passage forming member.

In order to meet the requirement for resinizing the passage forming member, a pipe-shaped connection port, which is separately formed, is brazed to the window portion provided in the tubular portion of the second mounting member. Although it may be possible to fix them in advance by such means as this, an increase in the number of parts and the number of manufacturing steps is unavoidable even in such a structure because separate forming of the pipe-shaped connection port and a brazing process are required. In addition to this, there is a problem that manufacturability is poor because highly accurate alignment between the opening of the air passage in the passage forming member and the window of the tubular portion is required. Moreover, since the pipe-shaped connection port is brazed to the tubular portion, it is extremely difficult to draw the tubular portion, so that the sealing performance between the passage forming member and the fitting surface of the tubular portion is improved. There was also a problem that it would be difficult to secure it by drawing.

[0007]

The present invention has been made in view of the above circumstances, and the problem to be solved is to provide a tube or the like for an air passage for exerting an air pressure on an air chamber. An object of the present invention is 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 body 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 resides in that a first mounting member and a second mounting member which are respectively mounted on members to be vibration-isolated are connected. While being elastically connected by a main rubber elastic body to form a fluid chamber in which an incompressible fluid is sealed, a part of the wall portion of the fluid chamber is constituted by a movable member, and the movable member is An air pressure control type fluid filled type vibration damping device, wherein an air chamber sealed on the opposite side of the fluid chamber is formed, and vibration damping characteristics are controlled by exerting air pressure on the air chamber. A tubular portion is provided on the second mounting member, and a passage forming member that forms an air passage communicated with the air chamber is assembled by press-fitting or restricting the tubular portion by press fitting or throttling. The tube with respect to the passage forming member Thereby forming a recess that opens to the outer peripheral surface that is fitted and fixed to the part, the opening in the central portion of the recess, the pipe portion of the communication allowed was tube shape to said air passage, from the bottom surface of the recess Depth of the recess towards the part
So that it projects at a height equal to or less than
It is formed integrally with the passage forming member , and the pipe part is stored in the recess.
In this state, by exposing it to the outside through the window portion provided in the tubular portion, a connection port of an air tube body that exerts air pressure on the air chamber is formed , and the outside of the pipe portion is further formed.
When the air tube is inserted and fitted on the peripheral surface, the outside of the air tube is
So that a gap is formed between the peripheral surface and the inner peripheral surface of the recess.
There is something I did.

In the pneumatically controlled fluid-filled type vibration damping device having the structure according to the invention of claim 1,
Since the pipe portion as the connection port of the air pipe body to the air passage is integrally formed by the passage forming member, the number of parts and the manufacturing process are reduced, and the simplification of the structure and the improvement of the manufacturability are advantageously achieved. To be done. In addition, the window portion formed in the tubular portion can be set to be sufficiently larger than the pipe portion, thereby relaxing the positioning accuracy when fitting and fixing the passage forming member to the tubular portion. Therefore, further improvement in manufacturability can be achieved.
Furthermore, since the recess is formed around the pipe portion, the workability of connecting the air pipe body such as the 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 manufacturing work or transportation of the vibration isolator. Moreover, since the pipe portion is formed in a state of being accommodated in the recess, it is press-fitted into the tubular portion of the passage forming member or squeezed into the tubular portion after the passage forming member is inserted into the tubular portion. In such cases, it is possible to perform press-fitting, drawing, etc. with good workability without any hindrance.
Thereby, the fluid tightness between the fitting surfaces of the passage forming member and the tubular portion can be advantageously and stably ensured.

The movable member is a member that is deformable or displaceable, and partitions the fluid chamber and the air chamber in a fluid-tight manner. For example, a plate-shaped rubber elastic body, a plate spring made of metal, or the like. It is possible to employ a coil spring or the like biased by an elastic body. In addition, 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 in a state of being pressed between the fitting surfaces, if necessary.

By the way, in the invention according to claim 1,
The material of the passage forming member is not particularly limited, and a passage forming member made of a metal such as an aluminum alloy can also be used. Particularly, as described in claim 2, the passage forming member is made of a synthetic resin material. A passage forming member is preferably adopted. That is,
The pipe portion as a connection port of the air tube to the air passage is integrally formed with the passage forming member, and it is necessary to press-fit and fix the separately formed pipe-shaped connection port to the passage forming member as in the conventional structure. Since the strength required for the passage forming member is small, the passage forming member made of a synthetic resin material that is lightweight, excellent in manufacturing and manufacturing, and low in cost can be suitably adopted.

According to a third aspect of the present invention, in the pneumatic 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. It is configured to include a main liquid chamber that is configured to generate an internal pressure fluctuation due to a vibration input, and a sub liquid chamber in which a part of the wall portion is formed by the movable member, and the sub liquid chamber A feature is that a fluid flow path communicating with the main liquid chamber is formed.

In the vibration isolator having the structure according to the third aspect of the invention, the vibration isolation is performed based on the flow action of the enclosed fluid through the fluid passage between the main liquid chamber and the sub liquid chamber. The effect is exhibited, and by controlling the pressure of the air chamber and controlling the flow state of the fluid through the fluid passage, the vibration control characteristics can be switched and controlled. Here, in the sub liquid chamber, for example, by configuring the movable member with a flexible film that is easily deformable, while the volume change is easily allowed while the air chamber is connected to the atmosphere, The movable member can be formed as an equilibrium chamber in which the negative pressure is sucked under the condition that the air chamber is connected to the negative pressure source, and the volume change is prevented. By switching the flow path between the communication state and the cutoff state, the vibration control characteristics can be switched. In the sub liquid chamber, for example, the movable member is configured by a vibrating plate that is vibrated by the pressure fluctuation exerted on the air chamber, so that the pressure that can be adjusted based on the vibration of the vibrating plate is adjusted. It is possible to form the control chamber, and if such a sub-liquid chamber is adopted, by controlling the internal pressure of the sub-liquid chamber according to the input vibration, the fluid flow through the fluid flow path is controlled, or By controlling the internal pressure of the main liquid chamber through the fluid flow path, it is possible to switch and control the vibration damping characteristics.

The invention according to claim 1 or 2 can be applied to a device different from the fluid filled type vibration damping device having the structure according to the invention of claim 3, for example, one of the wall portions. The main chamber is formed of a rubber elastic body to form a fluid chamber that includes a main liquid chamber in which fluctuations in internal pressure occur at the time of vibration input, and another part of the wall of the main liquid chamber extends to the air chamber. By configuring the movable member composed of a vibrating plate that is vibrated by the pressure fluctuation, the internal pressure of the main liquid chamber is directly controlled based on the vibration of the movable member to adjust the vibration isolation characteristics. It is also applicable to a fluid filled type vibration damping device having the above structure.

Further, the invention according to claim 4 is the invention according to claim 1.
In the air pressure control type fluid filled type vibration damping device according to any one of claims 1 to 3, the second mounting member has a cylindrical shape, and the second mounting member itself constitutes the tubular portion. One opening side of the second mounting member in the axial direction is fixed to the main rubber elastic body so as to be fluid-tightly closed, and the other opening side in the axial direction is fluid-tightly closed by the flexible film. As a result, the fluid chamber is formed inside the second mounting member, while the passage forming member is inserted into and fixed to the second mounting member by the passage forming member. A main liquid chamber in which a part of the wall part is made of the main rubber elastic body and causes internal pressure fluctuation due to vibration input, and a part of the wall part is made of the flexible film on both axial sides sandwiching Balance chamber in which the volume change is allowed by the deformation of the flexible membrane And the main liquid chamber and the equilibrium chamber communicate with each other through an orifice passage, and inside the passage forming member, a sub liquid chamber in which a part of the wall portion is formed of the movable member, A fluid flow path that communicates the sub liquid chamber with the main liquid chamber, and the air chamber that is located on the opposite side of the sub liquid chamber with the movable member interposed therebetween are formed. And

In the vibration isolator having the structure according to the invention as described in claim 4, the main liquid chamber, the equilibrium chamber, the orifice passage, the auxiliary liquid chamber, and the fluid flow path are skillfully utilized by utilizing the passage forming member. However, each is advantageously formed with a simple structure and a small number of parts. The flow action such as the resonance action of the fluid that is made to flow through the orifice passage between the main liquid chamber and the equilibrium chamber, the flow action of the fluid that is made to flow through the fluid flow passage between the main liquid chamber and the sub liquid chamber, etc. The anti-vibration effect is exerted based on this, and in particular, the anti-vibration characteristics can be switched and controlled by controlling the pressure of the air chamber and controlling the flow state of the fluid through the fluid passage. .

Further, in the same manner as in the third aspect of the invention, in the sub liquid chamber, for example, the movable member is formed of a flexible film that is easily deformable, so that the air chamber is connected to the atmosphere. Under the condition, the volume change is easily allowed, while under the condition that the air chamber is connected to the negative pressure source, the movable member is constrained by the negative pressure suction to form the second equilibrium chamber in which the volume change is prevented. If such a sub liquid chamber is adopted, the vibration control characteristics can be switched and controlled by substantially switching the fluid flow path between the communication state and the cutoff state. In the sub liquid chamber, for example, the movable member is configured by a vibrating plate that is vibrated by the pressure fluctuation exerted on the air chamber, so that the pressure that can be adjusted based on the vibration of the vibrating plate is adjusted. It is possible to form the control chamber, and if such a sub-liquid chamber is adopted, by controlling the internal pressure of the sub-liquid chamber according to the input vibration, the fluid flow through the fluid flow path is controlled, or By controlling the internal pressure of the main liquid chamber through the fluid flow path, it is possible to switch and control the vibration damping characteristics.

The invention according to any one of claims 1 to 3 can be applied to a device different from the fluid filled type vibration damping device having the structure according to the invention described in claim 4, for example, each other. A cylindrical fluid in which a first elastic member and a second elastic member are constituted by a shaft member and an outer cylinder member that are spaced apart in the radial direction, and a rubber elastic body is interposed between the radial facing surfaces of the first mounting member and the second mounting member. It can also be applied to a sealed type vibration damping device or the like.
In that case, the outer tubular member itself may be configured as a tubular portion, and the 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]

BEST MODE FOR CARRYING OUT THE INVENTION Hereinafter, in order to more specifically clarify the present invention, 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 an embodiment of the present invention. The engine mount 10 has a structure in which a first mounting member 12 and a second mounting member 14 that are arranged to face each other with a predetermined distance therebetween are elastically connected by a main rubber elastic body 16. The first mounting member 12 is mounted on the power unit side and the second mounting member 14 is mounted on the body side, so that the power unit can be supported against vibrations. Then, in the engine mount 10, the power unit load and the vibration isolation are provided in a substantially opposing direction (the substantially vertical direction in FIG. 1) between the first mounting member 12 and the second mounting member 14 under the condition of being mounted on the vehicle. Power vibrations are input respectively, and the main rubber elastic body 16 is compressed and deformed by a predetermined amount by the power unit load. In the following description, the vertical direction means the vertical direction in FIG. 1 in principle.

More specifically, the first mounting member 12 has a substantially circular solid block shape extending in the vertical direction, and a plate-shaped stopper that spreads outward in the radial direction is provided at the axially intermediate portion. The part 18 is integrally formed. In addition, the first mounting member 12 has a lower axial portion than the stopper portion 18,
The holding portion 20 has an inverted frustoconical shape whose diameter is gradually reduced downward, while a bolt hole 22 extending in the axial direction is provided in an axially upper portion of the stopper portion 18. Then, the first mounting member 12 is the bolt hole 2
It is configured to be fixedly mounted on the power unit side (not shown) by a mounting bolt screwed to the unit 2.

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

The stopper portion 1 of the first mounting member 12
8, a ring-shaped cushioning rubber 28 protruding upward in the axial direction is integrally formed with the main rubber elastic body 16. Then, the stopper portion 1 is inserted through the cushion rubber 28.
By abutting the contact portion 8 on the body side (not shown), the relative displacement amount 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 intermediate 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 through a bracket (not shown). A thin seal rubber layer 36 is provided on the inner peripheral surfaces of the large diameter portion 32 and the small diameter portion 34 over substantially the entire surface thereof, while the seal rubber layer 36 is provided at the opening on the small diameter portion 34 side. A thin elastic rubber film 3 which is formed as a flexible film and is easily deformable as a flexible film.
8 is disposed, and the opening on the small diameter portion 34 side is fluid-tightly closed by the rubber elastic film 38.

Then, the large diameter portion 3 of the second mounting member 14
2 is externally inserted into the connecting metal fitting 26, and the large diameter portion 32 is subjected to drawing processing or the like, so that the large diameter portion 32 is fluid-tightly fitted and fixed to the connecting metal fitting 26. As a result, the first mounting member 12 and the second mounting member 14 are elastically connected by the main rubber elastic body 16. Further, the opening of the second mounting member 14 on the large diameter portion 32 side is fluid-tightly covered by the main rubber elastic body 16, whereby the main rubber elastic body 16 inside the second mounting bracket 14 is covered. A fluid chamber containing a predetermined incompressible fluid is formed between the opposing surfaces of the rubber elastic film 38 and the rubber elastic film 38. The enclosed fluid may be water having a viscosity of 0.1 Pa · s or less, or a low-viscosity fluid such as alkylene glycol, polyalkylene glycol, or silicone oil in order to effectively obtain the vibration damping effect based on the resonance action of the 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 attached to the inner peripheral surface of the small diameter portion 34. It is fluid-tightly fitted and fixed. The partition member 40 divides the fluid chamber formed inside the second mounting member 14 into axially opposite sides. The main portion is constituted by the main rubber elastic body 16, and the main liquid chamber 42 in which the internal pressure change is caused based on the elastic deformation of the main rubber elastic body 16 at the time of vibration input is formed. On the side, a part of the wall is a rubber elastic film 38.
The equilibrium chamber 44 is formed in which the volume change is easily allowed based on the deformation of the rubber elastic film 38.

Here, the partition member 40 is provided with a substantially bottomed cylindrical outer wall member 48 provided with a central recess 46 opening in the central portion of the upper end surface in the axial direction, and the central recess 46 of the outer wall member 48. A rubber elastic plate 50 as a movable member is housed and arranged at the bottom of the central concave portion 46, and a thick disk-shaped lid member 52 is fitted and fixed to the opening portion of the central concave portion 46 to open the central concave portion 46. The portion is covered with a lid member 52. The partition member 40 is inserted into the second mounting member 14 from the large-diameter portion 32 side, and the outwardly facing flange portion 53 integrally formed at the opening-side peripheral edge portion of the outer wall member 48 is the second. The small diameter portion 34 of the second mounting member 14 is positioned in relation to 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.
Is subjected to drawing processing such as octagonal drawing to reduce the diameter, so that 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.
It is fluid-tightly fitted and fixed.

The outer wall member 48 is also provided with a recessed groove 56 which is open to the outer peripheral surface and extends a predetermined length in the circumferential direction. The recessed groove 56 is formed in the small diameter portion 34 of the second mounting member 14. Both ends are connected to the main liquid chamber 42 and the equilibrium chamber 44 through the communication holes 60 and 62, respectively, so that both chambers 42 and 44 are communicated with each other, and the internal pressure between both chambers 42 and 44 is covered. An orifice passage 58 is formed to allow fluid flow between the chambers 42 and 44 based on the difference. 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 the effective vibration damping effect can be exerted against the vibration in the low frequency range such as the shake based on the resonance action of the fluid made to flow through the orifice passage 58. The cross-sectional area etc. are set.

On the other hand, the rubber elastic plate 50 accommodated and arranged in the partition member 40 has a substantially disc shape, and the outer peripheral portion thereof is slightly thinned and is inclined obliquely downward in the axial direction. At the same time, a ring-shaped fitting ring 66 is fixed to the outer peripheral surface by vulcanization adhesion or the like. In the rubber elastic plate 50, the fitting ring 66 is press-fitted into the central recess 46 of the outer wall member 48 to be fluid-tightly fitted and fixed, so that the rubber elastic plate 50 spreads in the direction perpendicular to the axis at the bottom of the central recess 46. Further, it is arranged so as to be separated from the bottom surface of the central recess 46 by a predetermined distance based on its own elasticity and to be elastically deformed.

The central concave portion 46 of the outer wall member 48 in which the rubber elastic plate 50 is housed and arranged in this manner is covered with the lid member 52.
Since it is fluid-tightly covered with the inside of the central concave portion 46, between the facing surfaces of the rubber elastic plate 50 and 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 enclosed is formed. The volume of the sub liquid chamber 70 is allowed to change based on the elastic deformation of the rubber elastic plate 50.

Further, the lid member 52 is formed with a circumferential groove 72 which opens in the outer peripheral surface and extends in the circumferential direction.
By covering 2 with 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 both chambers 42 and 70 are communicated with each other. A fluid flow path 78 that allows fluid flow between the chambers 42 and 70 based on the internal pressure difference between the chambers 42 and 70.
Are formed. In the present embodiment, based on the resonance action of the fluid that is caused to flow through the fluid flow path 78, the fluid flow is adjusted so that an effective vibration damping effect is exerted against vibrations in a high frequency range such as idle vibration. The length and cross-sectional area of the passage 78 are set.

On the other hand, the central recess 46 is fluid-tightly partitioned by the rubber elastic plate 50 at the bottom of the central recess 46 located on the opposite side of the auxiliary liquid chamber 70 with the rubber elastic plate 50 interposed therebetween. Thus, a working air chamber 80 is formed as an air chamber that is closed to the external space. The bottom wall portion 82 of the outer wall member 48 is sufficiently thick, penetrates the inside of the bottom wall portion 82, extends radially from the outer peripheral surface, and opens at the bottom surface of the central recess 46. And working air chamber 8
Air supply / discharge passage 84 as an air passage communicated with 0
Are formed.

Then, with the mount mounted on the automobile,
An external air pipe body 92 is connected to the air supply / discharge path 84, and the working air chamber 80 is selectively switched between the negative pressure source 96 and the atmosphere via the switching valve 94 by the air pipe body 92. Are connected to each other. As a result, by switching the switching valve 94 in this mounted state, the vibration control characteristics of the engine mount 10 can be switched.

That is, the rubber elastic plate 50 is held in a state where elastic deformation is allowed based on its own elastic force and the like when the working air chamber 80 is connected to the atmosphere. When a negative pressure is applied to the chamber 80, the rubber elastic plate 50 is deformed and displaced downward (to the working air chamber 80 side) against the elastic force by the negative pressure suction force applied to the lower surface of the rubber elastic plate 50. By being pressed and adsorbed on the bottom surface of the central recess 46, the elastic member is held in a restrained state in which elastic deformation is not permitted. Therefore, the working air chamber 80
Under the condition that the liquid 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 is formed between the main liquid chamber 42 and the sub liquid chamber 70. 78
The flow of fluid through the flow is generated, and while 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,
In the state where the working air chamber 80 is connected to the negative pressure source 96, the rubber elastic plate 50 is constrained to make the volume of the sub liquid chamber 70 invariable, and as a result, the fluid flow passage 78 is substantially blocked. The fluid flow through the orifice passage 58 between the main liquid chamber 42 and the equilibrium chamber 44 is effectively generated, and the vibration isolation effect based on the fluid flow action of the fluid, that is, the vibration in the low frequency range is excellent. 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 auxiliary liquid chamber 70 are included,
A fluid chamber in which an incompressible fluid is enclosed is configured.

Here, the outer wall member 48 having the air supply / discharge passage 84 for exerting an air pressure on the working air chamber 80 is formed.
At the portion where the opening of the air supply / exhaust passage 84 is formed, a circular recess 86 that opens to the outer peripheral surface is formed. As a result, the opening portion of the air supply / exhaust passage 84 is made into a pipe-shaped pipe portion 88 projecting from the bottom surface of the recess 86 toward the opening in the central portion of the recess 86, and the outer wall member 4 is formed.
8 is integrally formed. The pipe portion 88 is formed with a protrusion height that is equal to or smaller than the depth of the recess 86, is accommodated in the recess 86, and is set so as not to protrude from the outer peripheral surface of the outer wall member 48. ing.

Further, the small diameter portion 34 of the second mounting member 14
At the position corresponding to the opening of the recess 86, a window portion 90 penetrating in the radial direction is formed in the window portion 90.
Through, the pipe portion 88 is exposed to the external space. As a result, as shown by the phantom line in the figure,
By inserting the external air tube 92 into the recess 86 from the window 90 and inserting and fitting the outer air tube 92 on the outer peripheral surface of the pipe 88, the external air tube 92 is formed in the outer wall member 48. It is possible to connect to 84.

That is, in the air supply / discharge passage 84, the pipe portion 8 formed integrally with the partition member 40 (outer wall member 48).
If the opening structure of the air supply / exhaust passage 84 composed of 8 is adopted,
It is not necessary to separately form and assemble a connection port for connecting the external air pipe 92 to the air supply / discharge passage 84.
By reducing the number of parts and the number of manufacturing steps, the desired pneumatically controlled fluid-filled type 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-fit strength when the separately formed connection port is assembled, the outer wall member 48 can be made of a synthetic resin material. As a result, improvement in manufacturing, weight reduction of the mount, cost reduction, etc. can be achieved extremely advantageously.

In addition, the pipe portion 8 of the outer wall member 48
Since 8 is formed in a form that does not protrude from the outer peripheral surface of the partition member 40, the work of inserting the partition member 40 into the second mounting member 14 and the subsequent drawing process for the second mounting member 14 are performed. Therefore, it is possible to highly stably secure the fluid tightness at the fitting surface between the partition member and the second mounting member 14 by drawing the second mounting member 14 by drawing. Is easier and
Even better manufacturability is achieved.

In addition, since the pipe portion 88 is formed so as to be completely accommodated in the recess 86, the action of an external force due to abutting against another member during transportation of the mount is caused. The damage can be effectively prevented by avoiding it. Further, even under the condition that the mount is mounted, the gap between the outer peripheral surface of the air tube body 92 and the inner peripheral surface of the recess 86 can be appropriately set and the pipe portion can be prevented. By limiting the deformation amount of 88, it is possible to prevent the pipe portion 88 from being damaged.

Although one embodiment of the present invention has been described in detail above, this is a literal example and the present invention is as follows.
The present invention is not limited to the specific examples.

For example, the tuning for 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 in any way. 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 tune the fluid passage 78 to a muffled sound in a frequency range higher than that.

In addition, a rubber elastic film 38, which is separately formed, is attached to the opening of the second mounting member 14 on the side of the small-diameter portion 34 so that the rubber elastic film 38 is fixed to the second mounting member 14 to close the second mounting member 14. On the other hand, the partition member 40 can be inserted and assembled from the small diameter portion 34 side, and when adopting such a structure, the second mounting fitting 14 is connected to the connecting fitting 26 at the large diameter portion 32. Without going through
It is also possible to directly vulcanize and adhere to the main rubber elastic body 16.

Furthermore, in the engine mount 10 in the above-described embodiment, the mount vibration isolation characteristic is controlled by substantially connecting / disconnecting the fluid flow path 78, but in addition, for example, air It is also possible to control the anti-vibration characteristics of the anti-vibration device, etc. by increasing / decreasing the air pressure in 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-described 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 the rubber elastic plate 50. Can be vertically reciprocally displaced (vibrated) by the suction force due to 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 auxiliary liquid chamber 70
The internal pressure of can be controlled. Therefore, at the time of vibration input, the rubber elastic plate 50 is vibrated at a frequency according to the input vibration to generate the internal pressure fluctuation in the sub liquid chamber 70, so that the sub liquid chamber 7
0 and the main liquid chamber 42 positively generate the fluid flow through the fluid flow path 78, and the vibration effect utilizing the flow action such as the fluid resonance action or the internal pressure of the main liquid chamber 42 is generated. The anti-vibration effect based on the control is extremely effectively exhibited. Then, the magnitude or phase of the air pressure exerted on the working air chamber 80 for vibrating the rubber elastic plate 50 is determined by the main liquid chamber 42.
It is possible to switch and control the mount anti-vibration characteristics by controlling in accordance with the input vibration while taking into consideration the pressure transmission time to the pressure transmission. As the control method,
For example, feedback control such as adaptive control for minimizing the error signal, map control based on a preset setting value, or the like can be used.

If such a vibrating structure based on the pneumatic pressure of the movable member is adopted, it is not necessary to incorporate an actuator member such as an electromagnetic driving means in the vibration isolator itself, so that the structure is extremely simple and easy to manufacture. There is a great advantage that the fluid filled type vibration damping device having an active vibration damping function can be realized in a lightweight, compact and inexpensive manner, and has durability and reliability compared to the case where an electromagnetic drive means is incorporated. It also has the advantage that it is easy to deal with even if it breaks down.

Further, when adopting the vibration structure by the pneumatic pressure of the movable member, for example, the wall portion of the main liquid chamber in which a part of the wall portion is constituted by the main rubber elastic body and the internal pressure fluctuates at the time of vibration input A part of the rubber elastic plate, by vibrating the rubber elastic plate based on the air pressure fluctuation of the air chamber formed behind it, directly exerts a pressure change on the main liquid chamber, It is also possible to control the vibration isolation characteristics. Specifically, for example, in the above-described embodiment, the lid member 52 is not provided, and the main liquid chamber 42 is configured to include the inside of the central recess 46 of the outer wall member 48. The pressure can be directly exposed to the chamber 42 and the pressure change can be directly exerted on the main liquid chamber 42 by vibrating the rubber elastic plate 50.

Further, in the above-described embodiment, the equilibrium chamber 4 communicating with the main liquid chamber 42 through the orifice passage 58.
4 was provided, such an orifice passage 58
It is also possible to configure the vibration isolation device without providing the equilibrium chamber 44.

Further, in the above-mentioned embodiment, a specific example of the present invention applied to a vibration isolator having a structure in which the first mounting member and the second mounting member are positioned so as to face each other in only one direction, is shown. In addition, according to the present invention, the first mounting member and the second mounting member are configured by the shaft member and the outer tubular member arranged at a predetermined distance radially outward of the shaft member. , FF type automobile engine mounts, body mounts, suspension bushes, etc., which are formed in a tubular shape as a whole by interposing a rubber elastic body between the axially facing surfaces of the shaft member and the tubular member. It is also applicable to a fluid filled type vibration damping device used.

In addition, in the above-described embodiment, a specific example of the present invention applied to an automobile engine mount is shown. However, the present invention may be applied to other vehicle body mounts, differential mounts, or various devices other than automobiles. It is needless to say that any of them can be similarly applied to the vibration isolator of FIG.

Although not listed one by one, the present invention
It can be carried out in a mode in which various changes, modifications, improvements and the like are added based on the knowledge of those skilled in the art, and such an embodiment does not depart from the gist of the present invention.
Both are included within 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, the outside of the air passage for exerting the air pressure on the air chamber to control the vibration damping characteristic. Since the connection port of the air tube is constituted by the pipe portion integrally projecting in the recess of the passage forming member in which the air passage is formed, the connection port of the external air tube is formed separately and the passage is formed. Since it is not necessary to assemble it to the forming member, the number of parts and the number of manufacturing processes can be reduced.
It can be advantageously realized with a simple structure and excellent manufacturability.

Moreover, the pipe portion is housed in the recess provided in the passage forming member and does not protrude from the outer peripheral surface of the passage forming member which is the fitting surface for the tubular portion of the second mounting member. Since it is formed in a shape, the pipe part does not hinder the assembling workability due to press fitting or drawing of the passage forming member into the cylindrical part of the second mounting metal fitting, and thus the manufacturing is further improved. The nature is demonstrated.

[Brief description of drawings]

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

[Explanation of symbols]

10 engine mount 12 First mounting bracket 14 Second mounting bracket 16 Rubber elastic body 40 partition members 42 Main liquid chamber 50 rubber elastic plate 70 Secondary liquid chamber 78 fluid flow path 80 Working air chamber 84 Air supply / discharge path 86 recess 88 Pipe 90 Window 92 Air tube

─────────────────────────────────────────────────── ─── Continuation of the front page (58) Fields surveyed (Int.Cl. ⁷ , DB name) E16F 13/26 F16L 21/00-21/08

Claims (3)

(57) [Claims] 1. A fluid chamber in which a first mounting member and a second mounting member, which are respectively mounted on vibration-proof coupled members, are elastically coupled by a main rubber elastic body, and a non-compressible fluid is enclosed. On the other hand, while forming a part of the wall portion of the fluid chamber with a movable member, an air chamber sealed on the side opposite to the fluid chamber is formed with the movable member sandwiched between the movable member and the movable member. In an air pressure control type fluid filled type vibration damping device which controls the vibration damping characteristics by exerting air pressure, a cylindrical portion is provided in the second mounting member, and an air passage communicated with the air chamber is formed. A passage forming member made of a synthetic resin material to be formed is fitted and fixed to the tubular portion by press fitting or drawing, while it is fitted to the tubular portion with respect to the passage forming member. Form a recess that opens on the outer peripheral surface that is fixed and fixed In the central portion of the recess, the pipe portion of the communication allowed was tube shape to said air passage so as to protrude at a depth Saya remote low height recess from the bottom surface of the recess toward the opening In the state of being integrally formed with the passage forming member and exposing the pipe portion to the outside through a window portion provided in the tubular portion in a state of being housed in the recess, air that exerts air pressure on the air chamber is exposed. A gap is formed between the outer peripheral surface of the air tube body and the inner peripheral surface of the recess when the air tube body is inserted and fitted on the outer peripheral surface of the pipe portion. An air pressure control type fluid filled type vibration damping device. 2. A main liquid chamber in which a part of a wall portion of the fluid chamber is constituted by the main rubber elastic body, and an internal pressure fluctuation is caused by a vibration input, and a part of the wall portion in the movable member. And a fluid flow path that connects the auxiliary liquid chamber to the main liquid chamber is formed.
1. The air pressure control type fluid filled type vibration damping device according to 1. 3. The second mounting member has a cylindrical shape so that the second mounting member itself constitutes the tubular portion, and one opening of the second mounting member in the axial direction is formed. One side is fixed to the main body rubber elastic body to be fluid-tightly closed, and the other opening side in the axial direction is fluid-tightly closed by a flexible film, so that the inside of the second mounting member is While the fluid chamber is formed, the passage forming member is inserted into and fixed to the second mounting member, so that a part of the wall portion is provided on both sides in the axial direction with the passage forming member interposed therebetween. A main liquid chamber that is composed of the main rubber elastic body and causes an internal pressure fluctuation due to vibration input, and a part of the wall part is composed of the flexible film, and the volume change is allowed by the deformation of the flexible film. Is formed, and the main liquid chamber and the equilibrium chamber are connected to the orifice passage. And a sub-liquid chamber in which a part of the wall portion is constituted by the movable member, and a fluid flow path communicating the sub-liquid chamber with the main liquid chamber, inside the passage forming member. The air pressure control type fluid filled type vibration damping device according to claim 1 or 2 , wherein the air chamber and the air chamber located on the opposite side of the auxiliary liquid chamber with the movable member interposed therebetween are formed. apparatus.