JPH0519696U - Fluid chamber partition member for fluid-filled mount - Google Patents

Abstract

(57) [Summary] (Modified) [Purpose] Easy to assemble to the mount body, and moreover, the flexible membrane is advantageously held in a predetermined position with a substantially constant holding pressure. To provide a fluid chamber partition member for a fluid-filled mount. [Structure] First partition fitting 4 having a fitting recess in the center
4 and the second partition metal fitting 46 having a fitting convex portion in the central portion are overlapped with each other, and the fitting convex portion is fitted and fixed in the fitting concave portion to form a fluid chamber partition member. ,
A thick holding portion 58 formed on the outer peripheral edge of the flexible film 56.
While holding the pinching pressure between the overlapping surfaces of the fitting concave portions and the fitting convex portions of the first and second partition fittings 44, 46, on the other hand, with respect to the holding portion 58 of the flexible film 56,
A positioning piece 80 that extends outwardly toward the inner peripheral surface of the fitting recess of the first partition fitting 44 is integrally provided.

Description

[Detailed description of the device]

[0001]

【Technical field】

 The present invention is a fluid-filled mount that is designed to obtain a vibration-damping effect based on the flow action of a fluid enclosed therein. The mount is disposed in a fluid chamber, and the fluid chamber is divided into a pressure-receiving chamber and an equilibrium chamber. The present invention relates to the structure of a fluid chamber partitioning member.

[0002]

[Background technology]

 Conventionally, as a type of anti-vibration connection or anti-vibration support device, a first mounting member and a second mounting member, which are respectively attached to members to be connected or supported, are provided between them. Vibration is input by partitioning the fluid chamber, in which the specified incompressible fluid is enclosed, by the partition member supported by the second mounting bracket while being connected by the rubber elastic body The chamber and the equilibrium chamber in which the volume change is allowed are formed, and the vibration damping effect is obtained based on the flow action of the fluid that is made to flow in the orifice passage that connects the pressure receiving chamber and the equilibrium chamber. A so-called fluid-filled mount is known.

In addition, in such a fluid-filled mount, when the vibration input in the high frequency range is performed, the high dynamic spring of the mount characteristic caused by the increase in the flow resistance of the orifice passage is reduced or reduced. In order to avoid this, for example, a rubber elastic plate or the like may be applied to the partition member in a state where the internal pressures of the pressure receiving chamber and the equilibrium chamber are applied to both side surfaces of the partition member, and a predetermined amount of deformation can be allowed. It is effective to support the flexible film so that when high-frequency vibration is input, the low dynamic spring effect can be exerted based on the flow action of the fluid generated by the elastic deformation of the rubber elastic plate. is there.

By the way, in order to support the flexible membrane with respect to the partition member, as disclosed in US Pat. No. 4,511,126, etc., the outer peripheral edge portion of the flexible membrane is supported with respect to the partition member. Although it may be possible to fix and hold them together, such a partitioning member is composed of a first partitioning metal fitting and a second partitioning metal fitting that are overlapped with each other, and the outside of the flexible membrane is placed between these two partitioning metal fittings. If the peripheral portion is held under pressure, no special bonding work is required, which is advantageous in manufacturing the mount.

However, according to such a structure, since the partition member is composed of a plurality of parts, the assemblability of these to the mount body becomes a problem.

In addition, the clamping force exerted on the outer peripheral edge of the flexible film changes the tension of the flexible film, and thus the mount vibration isolation characteristic. A constant clamping force is required to be stably applied to the outer peripheral edge of the flexible film.

In addition, when the flexible film is displaced during assembly of the partition member to the partition member, the desired vibration-damping effect may not be exerted. It is necessary to prevent displacement of the disposition position of the flexible film.

[0008]

[Solution]

 Here, the present invention has been made in view of the circumstances as described above, and the problem to be solved is that the assembly to the mount body is easy, and the flexible film is An object of the present invention is to provide a fluid chamber partition member having an improved structure, which can be advantageously held in a predetermined position with a constant clamping force.

[0009]

[Solution]

 In order to solve such a problem, according to the present invention, in a mount formed by connecting a first mounting bracket and a second mounting bracket with a rubber elastic body interposed therebetween. , Which is arranged in a fluid chamber formed inside, and divides the fluid chamber into a pressure receiving chamber for inputting vibration and a balance variable chamber of variable volume, which are communicated with each other through an orifice passage. The outer peripheral edge of the flexible membrane disposed between the pressure receiving chamber and the equilibrium chamber is clamped and held, and the inner pressures of the pressure receiving chamber and the equilibrium chamber are applied to both sides of the flexible membrane. , A fluid chamber partitioning member for supporting a predetermined amount of deformation, which is a fluid chamber partitioning member, having a first partitioning fitting having a fitting recessed portion in the central portion, and a fitting protruding portion in the central portion Overlap each other with the second partition fitting, and The fitting convex portion is fitted and fixed to the fitting portion, and the thick holding portion formed on the outer peripheral edge portion of the flexible film is fitted to the first and second partition fittings. While holding pressure between the overlapping surfaces of the concave portion and the fitting convex portion, the outer surface of the flexible metallic membrane holding part is pressed toward the inner peripheral surface of the fitting concave portion of the first partition fitting. The feature is that a positioning piece that extends toward one side is integrally provided.

[0010]

【Example】

 Hereinafter, in order to clarify the present invention more specifically, embodiments of the present invention will be described in detail with reference to the drawings.

First, FIG. 1 shows a specific example of an automobile engine mount including a fluid chamber partitioning member having a structure according to the present invention. In this figure, 10 and 12 are a first mounting member and a second mounting member, which are connected to each other by a rubber elastic body 14 interposed therebetween. In this engine mount, the first mounting member 10 is mounted on the vehicle body side, and the second mounting member 12 is mounted on the power unit side, so that the power unit can be supported against vibrations. Is becoming Further, during such mounting, a power unit load is exerted on such an engine mount, and a main vibration load to be isolated from vibration is input in a direction substantially opposite to the first mounting bracket 10 and the second mounting bracket 12. Will be done.

More specifically, the first mounting member 10 has a substantially disc shape. Further, a mounting bolt 16 and a positioning protrusion 18 adjacent to the mounting bolt 16 are provided upright in the substantially central portion of the first mounting member 10, respectively.

On the other hand, the second mounting member 12 is composed of a cylindrical metal member 20 having a substantially cylindrical shape and a bottom metal member 22 having a substantially shallow bottomed cylindrical shape. In the tubular member 20, one end in the axial direction is a taper portion 24 that expands outward in the axial direction, while the other end in the axial direction is a caulking portion 26. Further, a flange portion 28 that spreads outward in the direction perpendicular to the axis is integrally provided in the opening of the bottom metal member 22.

Then, the caulking portion 26 of the tubular metal member 20 is caulked and fixed to the flange portion 28 of the bottom metal member 22, so that the second mounting metal member 12 has a substantially deep bottomed cylindrical shape as a whole. , Formed. In this second mounting member 12, a mounting bolt 30 and a positioning protrusion 32 adjacent to the mounting bolt 30 are provided upright at substantially the center of the bottom metal member 22, respectively.

Further, the rubber elastic body 14 connecting the first mounting member 10 and the second mounting member 12 has a substantially truncated cone shape as a whole. An integrally vulcanized molded product is obtained by vulcanizing and adhering the first mounting member 10 to the end surface on the small diameter side of the rubber elastic body 14 and the taper portion 24 of the tubular member 20 on the outer peripheral surface on the large diameter side. Has been formed. That is, the rubber elastic body 14 elastically connects the first mounting member 10 and the second mounting member 12 and covers the opening of the second mounting member 12 in a fluid-tight manner. Has been done.

Inside the second mounting member 12, a diaphragm 34 made of a thin disk-shaped rubber elastic film is housed, and the outer peripheral edge portion of the diaphragm 34 and the bottom member 22 are accommodated. It is arranged by being clamped at the crimped portion. The inside of the second mounting member 12 is fluid-tightly divided by the diaphragm 34 into the first mounting member 10 side and the bottom mounting member 22 side.

A fluid chamber, in which a predetermined incompressible fluid is sealed, is formed on the first mounting member 10 side of the diaphragm 34. On the other hand, an air chamber 36 that allows the deformation of the diaphragm 34 is formed on the side opposite to the fluid chamber with the diaphragm 34 interposed therebetween.

As the fluid sealed in the fluid chamber, for example, water, alkylene glycol, polyalkylene glycol, silicone oil or the like is preferably used. Further, such filling of the fluid can be made advantageous, for example, by assembling the diaphragm 34, the bottom metal fitting 20 and the like to the integrally vulcanized molded article of the rubber elastic body 14 in the fluid. ..

Further, a partition member 38 is housed in the fluid chamber. The partition member 38 has a substantially disc shape as a whole, and the outer peripheral edge portion thereof is supported by the second mounting member 12.

The partition member 38 divides the fluid chamber into two parts. As a result, on the first mounting member 10 side with respect to the partition member 38, a part of the wall portion is constituted by the rubber elastic body 14, and the pressure receiving chamber 40 in which the internal pressure fluctuation is induced at the time of vibration input is formed. Has been done. On the other hand, on the side opposite to the pressure receiving chamber 40 with the partition member 38 sandwiched between them, a part of the wall portion is constituted by the diaphragm 34, and an equilibrium chamber 42 in which the volume change is easily allowed is formed. ..

Further, the partition member 38 is composed of a first partition metal fitting 44 and a second partition metal fitting 46 which are axially overlapped with each other and assembled. As shown in FIG. 2, the first partition fitting 44 is an aluminum alloy die-cast molding product and has a relatively thick disk shape. Further, a peripheral groove 48 opening to the outer peripheral surface is formed in the outer peripheral edge portion of the first partition fitting 44 with a length of a little less than one circumference in the circumferential direction. Furthermore, a circular fitting recess 50 is formed in the center of the first partition fitting 44.

On the other hand, the second partition member 46 is a press-formed product of a steel plate and has a relatively thin disk shape as shown in FIG. A circular fitting protrusion 52 is formed in the center of the second partition fitting 46.

Then, the first partition fitting 44 and the second partition fitting 46 are overlapped with each other, and the fitting projection 52 is inserted into the fitting recess 50 in a press-fitted state, and the fitting recess 50 is inserted. The outer peripheral surface 55 of the fitting convex portion 52 is fitted and fixed to the inner peripheral surface 54 to be integrally assembled. Further, in this assembly, both circumferential ends of the circumferential groove 48 provided in the first partition fitting 44 are overlapped with the first partition fitting 44 and the second partition fitting 46 through the communication holes 57 and 59. It is opened to the outside in the mating direction.

Further, on the bottom surface of the fitting concave portion 50 of the first partition fitting 44 and the top surface of the fitting convex portion 52 of the second partition fitting 46, annular grooves 60, 62 having an arc-shaped cross section are respectively provided. A gap 64 is formed in the central portion between the overlapping surfaces of the fitting concave portion 50 and the fitting convex portion 52. A rubber elastic film 56 as a flexible film is interposed between the bottom surface of the fitting recess 50 and the top surface of the fitting projection 52.

In the rubber elastic film 56, the central portion 63 has a substantially disc shape, and the thickened annular holding portion 58 is integrally provided on the outer peripheral portion thereof. There is. In addition, in the present embodiment, the holding portion 58 is formed with a substantially circular cross-sectional shape. The rubber elastic film 56 has its holding portion 58 sandwiched between the annular grooves 60 and 62 provided on the bottom surface of the fitting concave portion 50 and the top surface of the fitting convex portion 52, thereby The central portion 63 is arranged and supported in a state where free deformation within the gap 64 is allowed. It should be noted that through holes 66 and 68 are provided in the bottom surface of the fitting concave portion 50 and in the central portion of the top surface of the fitting convex portion 52 so as to connect the gap 64 to the outside.

Further, here, the annular grooves 60 and 62 are located on the bottom surface of the fitting recess 50 and the top surface of the fitting projection 52, respectively, at a predetermined dimension radially inward from the outer peripheral edge portions thereof. Is formed. That is, the fitting allowance between the fitting concave portion 50 and the fitting convex portion 52 is ensured thereby, and the holding portion 58 is deformed by pinching on the radial outside of the rubber elastic film 56. In this case, a space for rubber escape is secured.

Further, on the rubber elastic film 56, a thin projecting piece 80 that projects outward in the radial direction from the outer peripheral portion of the holding portion 58 is integrally formed continuously in the circumferential direction. There is. The protruding piece 80 is formed so that its outer diameter is substantially the same as or slightly smaller than the inner diameter of the fitting recessed portion 50 provided in the first partition fitting 44. In this embodiment, the protruding piece 80 constitutes a positioning piece.

When the rubber elastic film 56 is housed in the fitting recess 50 of the first partition fitting 44, the protruding piece 80 contacts the inner peripheral surface 54 of the fitting recess 50 and is guided. Thus, the rubber elastic film 56 is advantageously guided and positioned substantially in the center of the fitting recess 50. Therefore, as described above, although the holding portion 58 of the rubber elastic film 56 is located radially inward of the outer peripheral edge portion of the fitting recess 50 by a predetermined dimension, the rubber elastic film 56 is also retained. However, it can be advantageously guided to substantially the center of the fitting recess 50 and arranged at a predetermined position, so that the desired spring characteristics can be advantageously and stably exhibited.

In other words, since the rubber elastic film 56 is provided with the protruding piece 80, it is possible to prevent the position of the rubber elastic film 56 from being displaced and to hold the holding part 58 at a position where the holding part 58 is sandwiched. By setting a predetermined size radially inward from the outer peripheral edge of 50, the fitting margin between the fitting projection 50 and the fitting recess 52 and the escape area of the rubber on the radially outer side of the rubber elastic film 56 are both advantageous. Can be secured. Further, the arrangement position of the rubber elastic film 56 is advantageously defined, and the first partition fitting 44 and the second partition fitting 46 are advantageously fitted and fixed. The clamping force exerted on 58 can be advantageously made uniform, whereby the desired spring characteristics of the rubber elastic film 56 can be effectively and stably exhibited.

Then, the partition member 38 having such a structure is inserted into the tubular metal fitting 20, and the outer peripheral edge portion of the partition member 38 is joined to the caulking portion 26 of the tubular metal fitting 20 and the flange portion 28 of the bottom metal fitting 22. It is fixedly assembled to the second mounting member 12 by being sandwiched between them.

Further, as a result, the outer peripheral surface of the peripheral groove 48 formed in the first partition fitting 44 is covered, and the orifice passage for allowing the fluid flow between the pressure receiving chamber 40 and the equilibrium chamber 42. 70 are formed. The length and cross-sectional area of the orifice passage 70 are tuned so that a high damping effect with respect to low-frequency vibration such as shaking can be exerted based on, for example, the resonance action of the fluid that flows inside the orifice passage 70. Will be done.

Furthermore, the gap 64 formed in the partition member 38 is communicated with the pressure receiving chamber 40 and the equilibrium chamber 42 through the through holes 66 and 68. As a result, the internal pressures of the pressure receiving chamber 40 and the equilibrium chamber 42 are exerted on both side surfaces of the rubber elastic film 56 arranged in the gap 64, respectively, and the internal pressure difference between the chambers 40, 42 is increased. Based on the above, the rubber elastic film 56 can be deformed.

Then, when high-frequency vibration is input, a substantial fluid flow is generated between the pressure receiving chamber 40 and the equilibrium chamber 42 based on the deformation of the rubber elastic film 56, whereby the pressure receiving chamber 40 Therefore, fluctuations in the hydraulic pressure in the inside can be absorbed and reduced, and a lower dynamic spring of the mounting characteristics and further improvement of the vibration damping characteristics can be achieved.

Further, there, in the engine mount having the above-described structure, the positioning of the rubber elastic film 56 and the equalization of the clamping pressure on the rubber elastic film 56 can be advantageously achieved, and the rubber elastic film can be achieved. Since the spring characteristic of 56 can be stabilized, the improvement of the vibration damping characteristic due to the low dynamic spring effect of the mounting characteristic as described above, which is exhibited based on the elastic deformation of the rubber elastic film 56, is extremely improved. It can be achieved effectively and stably.

Moreover, in this embodiment, the holding portion 58 of the rubber elastic film 56 is formed to have a substantially circular cross-sectional shape, and the fitting concave portion 50 and the fitting convex portion 52 that press the holding portion 58 are sandwiched. Since the annular grooves 60 and 62 are also formed to have an arcuate cross section, the rubber elastic film 56 can be guided to a predetermined position even when the holding portion 58 is inserted into the annular grooves 60 and 62. Therefore, the positioning of the rubber elastic film 56 can be made even more advantageous.

Further, in the partition member 38 having the above-described structure, after the first partition fitting 44 and the second partition fitting 46 are assembled into an integrated structure, the second mounting fitting 12 is formed. Since it can be assembled to the second mounting member 12, the assembling work becomes easy even when the partition member 38 is assembled to the second mounting member 12 in a fluid.

Although the embodiments of the present invention have been described in detail above, this is a literal example, and the present invention should not be construed as being limited to such specific examples.

For example, in the above embodiment, the positioning piece of the rubber elastic film is constituted by the annular protruding piece 80 which is continuous in the circumferential direction, but the specific shape is not limited. It is also possible to configure the positioning piece by a plurality of protrusions that are not continuous in the circumferential direction.

Further, in the above-mentioned embodiment, the holding portion of the rubber elastic film is formed in a substantially circular sectional shape, but the specific shape is not limited, and for example, a substantially rectangular sectional shape or a semi-circular sectional shape can be used. It may be formed with a circular cross-sectional shape or the like.

Furthermore, both the first partition fitting and the second partition fitting can be formed by press-molded products or die-cast molded products.

Further, as the flexible film, a material other than the rubber elastic film, for example, a composite material of canvas and a rubber elastic body may be adopted.

Further, the length and structure of the orifice passage are determined according to the anti-vibration characteristics required for the mount, etc., and are not limited, and they are not necessarily provided for the partition member. Nor.

Although not listed one by one, the present invention can be carried out in a mode in which various changes, modifications, improvements, etc. are added based on the knowledge of those skilled in the art, and such an embodiment is also possible. However, it goes without saying that all of them are included in the scope of the present invention without departing from the spirit of the present invention.

[0045]

[Effect of the device]

 As is clear from the above description, in the fluid chamber partition member for the fluid-filled mount, which has the structure according to the present invention, the placement position of the rubber elastic film is controlled by the guiding action and the positioning action of the positioning piece. Since the deviation is prevented, it is possible to advantageously hold the holding portion of the rubber elastic film between the inner peripheral surface of the fitting recess and the inside in the radial direction by a predetermined dimension.

As a result, a fitting margin between the fitting concave portion and the fitting convex portion in the first and second partition fittings can be secured, and the fixing strength due to the fitting can be advantageously obtained, and the rubber elastic film can be obtained. Since it is possible to secure an escape area for rubber in the outer peripheral part of the rubber elastic film, the clamping force exerted on the holding part of the rubber elastic film is stabilized, and the desired spring characteristics of the rubber elastic film, and eventually the mount. Therefore, the intended vibration damping property can be effectively exhibited.

Moreover, since the first partition fitting and the second partition fitting are integrated by fitting and fixing, the workability of assembling to the mount body can be advantageously improved. ..

[Submission date] February 25, 1992

[Procedure Amendment 2]

[Document name to be amended] Statement

[Correction target item name] 0004

[Correction method] Change

[Correction content]

By the way, in order to support the flexible membrane with respect to the partition member, as disclosed in US Pat. No. 4,511,126, etc., the outer peripheral edge portion of the flexible membrane is supported with respect to the partition member. Although it may be possible to fix and hold the partition members, such a partition member is composed of a first partition member and a second partition member that are overlapped with each other, and the partition member is placed outside the flexible membrane. If the peripheral portion is held under pressure, no special bonding work is required, which is advantageous in manufacturing the mount.

[Procedure amendment 3]

[Document name to be amended] Statement

[Name of item to be corrected] 0009

[Correction method] Change

[Correction content]

[0009]

[Solution]

In order to solve such a problem, in the present invention, in a mount formed by connecting a first mounting bracket and a second mounting bracket with a rubber elastic body interposed between them. , Which are arranged in a fluid chamber formed inside and divide the fluid chamber into a pressure-receiving chamber for inputting vibration and a balance chamber of variable volume, which communicate with each other through an orifice passage. The outer peripheral edge of the flexible membrane disposed between the pressure receiving chamber and the equilibrium chamber is clamped and held, and the inner pressures of the pressure receiving chamber and the equilibrium chamber are applied to both sides of the flexible membrane. , A fluid chamber partitioning member for supporting a fluid that allows a predetermined amount of deformation, the first partitioning member having a fitting recess at the center, and a fitting projection at the center a second partition member, to suit top of each other, the fitting Parts to constitute by allowed to fitting fixing the fitting convex portion, the holding portion of the thick formed on the outer peripheral edge of the flexible film, fitted in their first and second partition member While sandwiching and holding between the overlapping surfaces of the concave portion and the fitting convex portion, with respect to the holding portion of the flexible membrane, the outer surface is directed toward the inner peripheral surface of the fitting concave portion of the first partition member . The feature is that a positioning piece that extends toward one side is integrally provided.

[Procedure correction 4]

[Document name to be amended] Statement

[Correction target item name] 0041

[Correction method] Change

[Correction content]

Furthermore, both the first partition fitting 44 and the second partition fitting 46 may be formed by press molding or die casting. Further, as the first and second partition member, in place of the exemplary such metal, it is also possible to use also was formed of synthetic resin material.

[Procedure amendment 5]

[Document name to be amended] Statement

[Correction target item name] 0046

[Correction method] Change

[Correction content]

As a result, a fitting margin between the fitting concave portion and the fitting convex portion of the first and second partition members can be secured, and the fixing strength by the fitting can be advantageously obtained, and the rubber elastic film can be obtained. Since it is possible to secure an escape area for rubber in the outer peripheral part of the rubber elastic film, the clamping force exerted on the holding part of the rubber elastic film is stabilized, and the desired spring characteristics of the rubber elastic film, and eventually the mount. Therefore, the intended vibration damping property can be effectively exhibited.

[Procedure Amendment 6]

[Document name to be amended] Statement

[Correction target item name] 0047

[Correction method] Change

[Correction content]

Moreover, since the first partition member and the second partition member are integrated by fitting and fixing, the workability of assembling to the mount body can be advantageously improved. .

[Brief description of drawings]

FIG. 1 is a vertical cross-sectional view showing a specific example of an engine mount including a fluid chamber partition member according to an embodiment of the present invention.

FIG. 2 is an exploded view of a fluid chamber partition member used in the engine mount shown in FIG.

[Explanation of symbols]

 10 First Mounting Metal Fitting 12 Second Mounting Metal Fitting 14 Rubber Elastic Body 34 Diaphragm 38 Partitioning Member 40 Pressure Receiving Chamber 42 Equilibration Chamber 44 First Partitioning Metal Fitting 46 Second Partitioning Metal Fitting 50 Fitting Concavity 52 Fitting Convex 54 Inside Circumferential surface 56 Rubber elastic film 58 Holding portion 60, 62 Annular groove 63 Central portion 64 Gap 66, 68 Through hole 70 Orifice passage 80 Projecting piece

[Procedure amendment]

[Submission date] February 25, 1992

[Procedure Amendment 1]

[Document name to be amended] Statement

[Name of item to be corrected] Claim 1

[Correction method] Change

[Correction content]

Claims (1)

[Scope of utility model registration request] 1. A first mounting member and a second mounting member,
In a mount formed by connecting them with a rubber elastic body interposed between them, a vibration is input, which is arranged in a fluid chamber formed inside and communicated with each other through an orifice passage. The pressure-receiving chamber and the equilibrium chamber of variable volume, and the outer peripheral edge portion of the flexible membrane disposed between the pressure-receiving chamber and the equilibrium chamber is clamped and held to form the flexible membrane. A fluid chamber partitioning member in a fluid-filled mount that supports the internal pressures of the pressure receiving chamber and the equilibrium chamber on both sides to allow a predetermined amount of deformation, and has a fitting recess at the center. A first partitioning metal having and a second partitioning metal having a fitting convex portion in the central portion are overlapped with each other, and the fitting convex portion is fitted and fixed in the fitting concave portion, A thick wall formed on the outer peripheral edge of the flexible film. While holding the holding portion by sandwiching it between the overlapping surfaces of the fitting concave portion and the fitting convex portion of the first and second partition fittings, the first portion is held against the holding portion of the flexible film. A fluid chamber partition member in a fluid-filled mount, wherein a positioning piece that extends outwardly toward the inner peripheral surface of the fitting recess of the partition fitting is integrally provided.