JPH06264956A - Fluid encapsulated mount device - Google Patents

Abstract

PURPOSE:To improve mounting strength of a pipe for mounting an external pipe passage for an outside opening of a supply and discharge passage provided in an orifice member made of resin by a simple structure. CONSTITUTION:A connection metal fitting 72 which has a through hole 74 which is communicated with a supply and discharge passage 68 is inserted into an outside opening 70 of the supply and discharge passage 68 in an orifice member 36 made of resin, and an outer peripheral part of an outside end face of the connection metal fitting 72 is pushed and held by a lid metal fitting 22 which covers recessed grooves 60, 62 for forming orifice provided on an outer peripheral face of the orifice member 36. A metal pipe 80 for mounting an external pipe which protrudes outward through the lid metal fitting 22 is fitted and fixed in the through hole 74 of the connection metal fitting 72.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a fluid-filled mount device in which mount vibration damping characteristics are switched on the basis of the action of a pressure fluid introduced from the outside, and more particularly to a mouthpiece for mounting an external conduit for introducing the pressure fluid. The present invention relates to a fluid-filled mount device which can advantageously obtain a mounting strength of a pipe to a mount body with a simple structure.

[0002]

2. Description of the Related Art Conventionally, a predetermined incompressible fluid is sealed as a vibration-proof connecting body or a support body interposed between members constituting a vibration transmission system such as an automobile engine mount. A fluid-filled mount device is known in which a fluid chamber is formed and the vibration-damping effect based on the flow action of the enclosed fluid is utilized. Especially, in recent years, the required vibration-damping characteristics associated with the upsizing of automobiles and the like. In order to cope with the higher sophistication, there is a demand for a mounting device that can achieve both the high damping effect for low frequency vibration and the low dynamic spring effect for high frequency vibration, which are contradictory characteristics.

Therefore, the applicant of the present application has previously disclosed that the Japanese Patent Application Laid-Open No.
In No. 60231, inside a mount device in which a first mounting bracket and a second mounting bracket are connected by a rubber elastic body, a pressure receiving chamber that causes internal pressure fluctuation at the time of vibration input, and a part of each wall Is formed of a flexible film to form the first and second equilibrium chambers whose volume is variable, and
A slidability forming a first orifice passage and a second orifice passage that connect the pressure receiving chamber to the first equilibrium chamber and the second equilibrium chamber, while forming a part of the wall portion of the second equilibrium chamber. A closed working chamber is formed behind the membrane, and negative pressure and atmospheric pressure are selectively applied to the working chamber so that the first orifice passage and the second orifice passage are selectively operated. A fluid-filled mounting device is disclosed.

By the way, in such a mounting device, generally, as disclosed in the above-mentioned publication, an orifice member is supported by a second mounting member, and a concave groove formed on the outer peripheral surface of the orifice member is formed. An orifice passage is formed by covering with a tubular lid fitting, and
A supply / discharge passage for introducing negative pressure or atmospheric pressure to the working chamber is formed so as to penetrate the inside of the orifice member. Further, in the outer opening of the supply / discharge passage provided in the orifice member,
A pipe as an attachment mouthpiece of an external conduit for guiding the pressure fluid is inserted, and is attached in a state of penetrating the lid fitting and protruding outward.

However, in the mounting device having such a structure, if a resin-made orifice member is adopted in order to improve the manufacturability and reduce the weight, it is difficult to obtain the mounting strength of the pipe to the outer opening of the supply / discharge passage. In addition, there is a problem that it is difficult to secure sufficient durability and reliability because the resin is easily set and the pressure fluid leaks.

Although it is conceivable to screw the pipe to the orifice member in order to improve the mounting strength of the pipe, if such a structure is adopted, a special manufacturing process such as tapping is added. Not only that, the assembly workability is unavoidably deteriorated, which is not practical.

[0007]

The present invention has been made in view of the above circumstances, and a problem to be solved by the present invention is to provide a supply / discharge passage formed through a resin orifice member. It is an object of the present invention to provide a fluid-filled mount device capable of easily attaching a pipe as an external conduit connection mouth to an outer opening with excellent attachment strength.

Further, the present invention also provides a fluid-filled type mount device capable of sufficiently securing the sealing property at the mounting portion of the pipe to the resin orifice member with a simple structure. And

[0009]

In order to solve such a problem, a feature of the present invention resides in that a first mounting member and a second mounting member that are arranged at a predetermined distance are connected by a rubber elastic body. A predetermined pressure incompressible fluid is enclosed in the pressure receiving chamber, a part of the wall portion of which is made of the rubber elastic body, and at least one of the wall portions of which is made of a flexible film. Forming two equilibrium chambers, supporting the orifice member made of resin with the second mounting member, and covering the concave groove formed on the outer peripheral surface of the orifice member with the cylindrical lid member. Thereby forming an orifice passage that communicates the pressure receiving chamber and the equilibrium chamber, while forming a closed working chamber between the flexible film and the orifice member, and applying a pressure fluid to the working chamber. A supply / discharge passage for supplying / discharging is provided inside the orifice member. In a fluid-filled mount device penetrating through and opening to the outer peripheral surface, a connection fitting having a through hole that communicates with the supply / discharge passage is inserted and arranged in an opening of the orifice member outside the supply / discharge passage. In addition, while the outer peripheral portion of the outer end surface of the connection fitting is pressed and held by the lid fitting, the through hole of the connection fitting,
The metal pipe for external pipe line attachment that protrudes outward through the lid fitting is press-fitted and fixed.

[0010]

In the fluid-filled mount device having the structure according to the present invention, the metal pipe is fixedly attached to the supply / discharge passage formed in the orifice member. It is performed by press fitting a metal pipe into a metal fitting.

Further, in the connection fitting into which the metal pipe is press-fitted and fixed, the outer peripheral edge portion of the outer end face is pressed by the cover fitting that covers the concave groove of the orifice member and forms the orifice passage, so that the inside of the supply / discharge passage is Be held in.

Therefore, in such a fluid-filled mount device, the metal pipe is attached to the orifice member by press-fitting of metal to metal.
Large mounting strength and durability can be stably obtained.

Moreover, since the connection fitting for press-fitting the metal pipe is fixed to the orifice member by using the cover fitting for covering the concave groove, no special mounting member or bonding process is required and the structure becomes complicated. Also, there is no problem that assembly workability deteriorates.

Further, since the lid fitting is pressed against the outer peripheral edge portion of the outer end surface of the connecting fitting, the gap between the outer peripheral edge portion of the connecting fitting and the orifice member can be sealed by the lid fitting. Therefore, it is possible to easily secure the fluid tightness at the attachment portion of the metal pipe to the orifice member.

[0015]

EXAMPLES Examples of the present invention will now be described in detail with reference to the drawings in order to clarify the present invention more specifically.

First, FIG. 1 shows an automobile engine mount as an embodiment of the present invention. In this figure, 10 and 12 are a first mounting member and a second mounting member, respectively, which are arranged to face each other with a predetermined distance from each other, and the main rubber elastic body 14 interposed between them. Are elastically connected by. Then, this engine mount is attached to each of the first mounting bracket 10 and the second mounting bracket 12 on the vehicle body side and the power unit side, and is interposed between the vehicle body and the power unit to mount the power unit. Anti-vibration support for the vehicle body. In such an mounted state, in such an engine mount, the weight of the power unit is exerted in the substantially opposing direction of the first and second mounting members 10 and 12 (generally the vertical direction in FIG. 1), and the main body rubber elastic body By elastically deforming 14, both of the mounting brackets 10 and 12 are positioned close to each other by a predetermined distance, and are mainly input in a direction substantially opposite to the first and second mounting brackets 10 and 12. The anti-vibration effect is exerted against the vibration caused by the vibration.

More specifically, the first mounting member 10
Are formed in a substantially disc shape. A mounting bolt 16 projecting outward is fixed to a substantially central portion of the first mounting member 10.

A main rubber elastic body 14 is vulcanized and adhered to the first mounting member 10. The main rubber elastic body 14 has a substantially truncated cone shape as a whole,
It has a recess 18 that opens to the large diameter end surface. And
The first mounting bracket 1 is attached to the end surface of the main body rubber elastic pair 14 on the small diameter side.
While 0 is vulcanized and bonded, a cylindrical connecting fitting 20 is vulcanized and bonded to the outer peripheral surface of the large-diameter side end.

Further, the main rubber elastic body 14 is assembled with a seal metal fitting 22 as a cover metal fitting having a thin-walled, substantially bottomed cylindrical shape as a whole. The seal fitting 22 is provided with a cylindrical wall portion having a stepped cylindrical shape including a small diameter portion 24 on the bottom side and a large diameter portion 26 on the opening side, and has a through hole 28 in the bottom portion. Then, the large-diameter portion 26 is externally inserted into the connecting metal fitting 20 and pressed against the outer peripheral surface of the connecting metal fitting 20 by reducing the diameter, whereby the seal metal fitting 22 is assembled to the main rubber elastic body 14.

The small diameter portion 24 of the seal fitting 22 is also provided.
On the inner peripheral surface of the large diameter portion 26, thin seal rubber layers 32 and 34 are integrally provided over substantially the entire surface. Further, a disk-shaped first diaphragm 30 as a flexible film is fixed to the bottom of the seal fitting 22, and the through hole 28 is fluid-tightly closed. In this embodiment, the seal rubber layer 32 provided on the inner peripheral surface of the small diameter portion 24 and the first diaphragm 30 are integrally formed.

By assembling the main body rubber elastic body 14 and the seal fitting 22, the opening of the seal fitting 22 is covered with the main body rubber elastic body 14, so that a predetermined inside of the seal fitting 22 is provided. A fluid chamber in which the fluid of (1) is enclosed is formed. As the filled fluid, water, alkylene glycol, polyalkylene glycol, silicone oil, etc. are generally used. The fluid is sealed in the fluid chamber by, for example, assembling the main rubber elastic body 14 and the seal fitting 22 in the fluid.

On the other hand, inside the seal fitting 22, an orifice member 36 having a substantially thick disk shape as a whole is provided.
It is accommodated in the small diameter portion 24. As shown in FIG. 2, the orifice member 36 is composed of a lower orifice member 38 and an upper orifice member 40, each of which has a substantially disk shape as a whole.

The lower orifice member 38 is formed with a downward recess 42 that opens downward and an upward recess 44 that opens upward. On the other hand, the upper orifice member 40 has a downward recess 45 that opens downward.
And has a sandwiching portion 48 that projects radially outward at the upper end in the axial direction, and a cylindrical wall portion 46 that projects downward in the axial direction. Then, the upper and lower orifice members 40 and 38 are axially overlapped with each other, and the cylindrical wall portion 46 of the upper orifice member 40 is fitted into the upward recess 44 of the lower orifice member 38 so that the upward direction of the lower orifice member 38 is increased. The recess 44 and the downward recess 45 of the upper orifice member 40
And are combined so that they cover each other.

A disc-shaped second diaphragm 54 serving as a flexible film is disposed between the superposed surfaces of the upper and lower orifice members 40 and 38, and the outer peripheral edge portion is located at the lower orifice member. The pressure is held between the bottom surface of the upward recessed portion 38 of 38 and the tip surface of the cylindrical wall portion 46 of the upper orifice member 40. Thereby, the upper and lower orifice members 40, 38
The space formed therebetween is partitioned into a downward recess 45 side of the upper orifice member 40 and an upward recess 44 side of the lower orifice member 38 with the second diaphragm 54 interposed therebetween.

Further, a groove 62 extending in the circumferential direction is formed on the outer peripheral surface of the upper orifice member 40, and both ends in the circumferential direction of the groove 62 are sandwiched by the holding portion 48 of the upper orifice member 40.
The side end surface and the downward recess 45 of the upper orifice member 40 are opened. Also, the lower orifice member 3
The outer peripheral surface of 8 is formed with a recessed groove 60 spirally extending in the circumferential direction, and both ends in the circumferential direction thereof are the recessed groove 62 of the upper orifice member 40 and the downward recessed portion of the lower orifice member 38. And 42.

Further, the lower orifice member 38 is provided with an air passage 68 extending radially through the central portion in the axial direction, and the inner end of the air passage 68 is provided in the lower orifice member 38.
The outer end is opened to the outer peripheral surface of the lower orifice member 38 while being opened to the upward recess 44.

The outer opening 70 of the air passage 68 is also provided.
Has a large diameter over a predetermined length. Then, a substantially thick-walled cylindrical connecting fitting 72 is inserted into the outer opening 70, and the through hole 74 is arranged in a state of being communicated with the air passage 68.

Thus, such an orifice member 36
Is inserted into the small-diameter portion 24 of the seal fitting 22, and the sandwiching portion 48 of the upper orifice member 40 is assembled by being sandwiched and held between the connecting fitting 20 and the step portion of the seal fitting 22. Further, the small-diameter portion 24 of the seal fitting 22 is reduced in diameter so as to be in close contact with the peripheral surface of the orifice member 36.

As a result, the fluid chamber formed inside the seal fitting 22 is partitioned by the orifice member 36, and a part of the wall portion is constituted by the rubber elastic body 14 so that the internal pressure fluctuates when vibration is input. A pressure receiving chamber 50, a first equilibrium chamber 52 in which a part of the wall portion is constituted by the first diaphragm 30 and the volume change is allowed by the deformation of the first diaphragm 30, and the wall portion. Part of the second diaphragm 5
A second equilibrium chamber 56 which is configured by 4 and whose volume change is allowed by the deformation of the second diaphragm 54 is formed. Further, the second diaphragm 54 is provided in a portion located on the opposite side (upward recess 44 side of the lower orifice member 38) with respect to the second equilibrium chamber 56 with the second diaphragm 54 interposed therebetween. Working chamber 5 that allows deformation
8 is formed.

Further, the concave grooves 62 and 60 formed in the upper and lower orifice members 40 and 38 are also the small diameter portion 24 of the seal fitting 22.
The first orifice passage 64 that connects the pressure receiving chamber 50 and the first equilibrium chamber 52 with the concave grooves 60 and 62, and the pressure receiving chamber 50 and the second equilibrium chamber 56.
Second orifice passages 66 that communicate with and are formed respectively.

Further, in the small-diameter portion 24 of the seal fitting 22, at a position corresponding to the outer opening 70 of the air passage 68 in the orifice member 36, the outer diameter of the connecting fitting 72 inserted in the outer opening 70 is larger than the outer diameter. Is also smaller and has a diameter larger than the inner diameter of the through hole 74 of the connection fitting 72.
Are formed. Then, as shown in FIG. 3, the peripheral edge of the insertion hole 76 is brought into contact with the connecting fitting 72, so that the connecting fitting 72 is pressed into the outer opening 70 and fixedly held. ing.

The small diameter portion 24 of the seal fitting 22 is also
The seal rubber layer 32 is sandwiched between the contact surfaces of the connection fitting 72 and the connection fitting 72, thereby sealing the gap between the connection fitting 72 and the orifice member 36.

Then, the second mounting member 12 having a bottomed cylindrical shape with a slightly larger step is externally inserted to the sealing member 22 so as to sandwich the large diameter portion 26 of the sealing member 22 in the axial direction. Further, it is fixed by caulking to the connecting fitting 20. As a result, the second mounting member 12 is mounted on the outer peripheral surface of the large-diameter side end portion of the main rubber elastic body 14, and the sealing member 22 is firmly fixed to the coupling member 20.

Further, an insertion hole 78 is formed in the cylindrical wall portion of the second mounting member 12 at a position corresponding to the insertion hole 76 of the seal fitting 22, and the orifice member is inserted through these insertion holes 76, 78. Connection fitting 72 attached to 36
The through hole 74 is open to the outside. And
The metal pipe 80 is press-fitted into the through hole 74,
Insertion hole 7 of seal fitting 22 and second mounting fitting 12
It is fixed so as to project outward through 6, 78.

In the engine mount having the above-described structure, the first and second mounting members 10 and 12 are mounted on the vehicle body side and the power unit side, respectively, and are interposed between them, and the An external air conduit 82 is connected to the pipe 80. As a result, negative pressure and atmospheric pressure are selectively applied to the working chamber 58 through the external air conduit 82 based on the switching operation of a valve (not shown).

When the external air conduit 82 is connected to the atmosphere, the working chamber 58 having a predetermined volume is exposed to allow the deformation of the second diaphragm 54, while the external air is allowed to deform. When the line 82 is connected to the negative pressure source,
The second diaphragm 54 is sucked and adsorbed on the bottom surface of the upward recess 44 of the lower orifice member 38, and the working chamber 58 is substantially disappeared, so that the deformation of the second diaphragm 54 is prevented. It will be.

Therefore, under the condition that the external air conduit 82 is connected to the atmosphere, the volume of the second equilibrium chamber 56 is made variable, so that when the vibration is inputted, the second equilibrium chamber 66 passes through the second orifice passage 66. The flow of the fluid is generated, and the low dynamic spring effect against medium or high frequency vibration such as idling vibration is exerted. On the other hand, when the external air pipeline 82 is connected to the negative pressure source, Since the volume of the equilibrium chamber 56 is made invariable and the flow of the fluid between the pressure receiving chamber 50 and the second equilibrium chamber 56 is substantially blocked, the vibration is input through the first orifice passage 64. The flow of the fluid is generated, and a high damping effect is exerted on low-frequency large-amplitude vibrations such as shakes and bounces.

Here, in such an engine mount, the connecting port of the external air conduit 82 is formed of a metal pipe 80, and a connecting metal fitting 72 is attached to the mounting portion of the metal pipe 80 for the orifice member 36. Is provided and the metal pipe 80 is attached and fixed to the orifice member 36 by the metal-to-metal press-fitting. The mounting strength can be extremely advantageously secured.

The connecting fitting 72 is the orifice member 3
Seal metal fitting 2 for covering the recessed grooves 60, 62 provided in 6
Since it is pressed and fixed to the orifice member 36 by utilizing No. 2, there is no need for a special fixing member or a bonding step, and the structure is complicated and the assembly workability is deteriorated. Nothing.

Moreover, the connection fitting 72 and the orifice member 3
6 and the concave groove 6 provided in the orifice member 36.
Since they are simultaneously sealed by the seal fitting 22 that seals 0 and 62, pressure leakage through the gap between the connection fitting 72 and the orifice member 36 can be advantageously prevented without using a special member.

The embodiments of the present invention have been described in detail above, but these are literal examples, and the present invention should not be construed as being limited to such specific examples.

For example, when the orifice member is formed of a plurality of members (38, 40) as in the above embodiment, at least the member in which the air passage 68 is formed is made of resin. The present invention can be applied, and the effects as described above can be effectively exerted.

Further, in the above embodiment, the concave groove 60 forming the first orifice passage 64 and the second orifice passage 6 are formed.
Any of the concave grooves 62 forming the 6 is the orifice member 3
Although it is formed by opening on the outer peripheral surface of 6, the concave groove forming the second orifice passage 66 is formed by opening on the axial end surface and is covered with another member. Is also good.

Furthermore, in the above-described embodiment, a specific example of the present invention applied to a mounting device having one pressure receiving chamber 50 and two equilibrium chambers 52 and 56 is shown. The same can be applied to a mounting device having one pressure receiving chamber and one equilibrium chamber, and a mounting device having one pressure receiving chamber and three or more equilibrium chambers.

Furthermore, it is also possible to construct the tubular lid fitting, which is externally fitted to the orifice member and covers the concave groove, by the second fitting.

Further, in the above embodiment, as the pressure fluid,
Negative pressure air and atmospheric air were used, but the types are not limited, and the present invention is also applicable to a mounting device that uses positive pressure air, an incompressible positive fluid, or the like as a pressure fluid. Can be applied.

In addition, in the above embodiment, a specific example of the present invention applied to an automobile engine mount is shown, but the present invention can be applied to various mounting devices. .

Although not listed one by one, the present invention is
Based on the knowledge of those skilled in the art, it can be implemented in various modified, modified, and improved modes, and
It goes without saying that all such embodiments are included in the scope of the present invention without departing from the spirit of the present invention.

[Brief description of drawings]

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

FIG. 2 is an exploded view of an orifice member that constitutes the engine mount shown in FIG.

FIG. 3 is an enlarged cross-sectional view of a main part of the engine mount shown in FIG.

[Explanation of symbols]

 10 1st mounting metal fittings 12 2nd mounting metal fittings 14 Main rubber elastic body 22 Seal metal fittings 30 1st diaphragm 36 Orifice member 50 Pressure receiving chamber 52 1st equilibrium chamber 54 2nd diaphragm 56 2nd equilibrium chamber 58 Action Chamber 60, 62 Recessed groove 64 First orifice passage 66 Second orifice passage 68 Air passage 70 Outer opening 72 Connection fitting 74 Through hole 76 Insertion hole 80 Metal pipe 82 External air pipeline

Claims (1)

[Claims] 1. A wall portion in which a first non-compressible fluid is sealed by connecting a first mounting member and a second mounting member, which are arranged at a predetermined distance, with a rubber elastic body. A pressure receiving chamber whose part is formed of the rubber elastic body and at least one equilibrium chamber in which a part of the wall part is formed of a flexible film, and a resin is attached to the second mounting bracket. The orifice member made of aluminum is supported, and the concave groove formed on the outer peripheral surface of the orifice member is covered with a cylindrical lid fitting to form an orifice passage that connects the pressure receiving chamber and the equilibrium chamber. On the other hand, a sealed working chamber is formed between the flexible film and the orifice member, and a supply / discharge passage for supplying / discharging a pressure fluid to / from the working chamber penetrates the inside of the orifice member and has an outer periphery. For a fluid-filled mount device that is opened on the surface A connecting metal fitting having a through hole that communicates with the supply / discharge passage is inserted into the outer opening of the supply / discharge passage in the orifice member, and the outer peripheral portion of the outer end surface of the connecting metal is used as the lid metal fitting. The fluid-filled mount device is characterized in that a metal pipe for external pipe line attachment that penetrates through the lid fitting and projects outward is press-fitted into the through hole of the connection fitting while being pressed and held.