JP2000230600A - Liquid filled vibration damping device - Google Patents

Abstract

(57) [Summary] [Object] To provide a liquid-filled type vibration damping device which is excellent in product reliability, functionality, mountability and assemblability. A partition body (7) has an upper partition member (26), a lower partition member (27) and a rubber-like member (28), and an outer peripheral end of the lower partition member (27) extends radially outward. While only the extending portion 29 is swaged and fixed to the mounting bracket of the vibration isolator main body, the outer peripheral edge of the upper end of the upper partition member 26 is pressed against the notch step portion 30 on the liquid chamber side outer periphery of the vibration isolation base 4 for positioning.
The product's reliability, functionality, and mountability were ensured so that it could be easily assembled.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a liquid filled type vibration damping device mainly used for supporting a vibration generator such as an automobile engine.

[0002]

2. Description of the Related Art As a liquid filling type vibration damping device such as an engine mount for supporting the vibration of a vibration generator such as an automobile engine so as not to be transmitted to a vehicle body, a liquid chamber in a vibration damping device main body and a sub liquid chamber are arranged. The liquid chamber is provided with a partitioning body which is divided into two parts, and an orifice which connects the main liquid chamber and the sub-liquid chamber is formed in the partitioning body, so that the orifice exerts a vibration damping function by the liquid flow effect of both liquid chambers. In addition, there has been known one in which two orifices (double orifices) are formed in the partition body in order to attenuate different frequency vibrations.

For example, in the vibration isolator of the prior art example 1,
A third liquid chamber is formed inside the partition member by covering another partition member formed by vulcanizing and bonding a sub-diaphragm on the upper side of the partition member provided on the main liquid chamber side, and forming a third liquid chamber inside the liquid chamber. By providing two orifices, an orifice passage on the low frequency side for countermeasures against shake vibration and an orifice passage on the high frequency side for countermeasures for idle vibration have been proposed to improve the functionality ( JP-A-9-100866
Reference).

Further, in the vibration isolator of Conventional Example 2, a part of one vulcanized rubber member is divided into a partition member and a rubber member.
Two diaphragms having different elastic moduli are sandwiched between a restraining member forming a closed air chamber, and one rubber-like member constitutes two diaphragms, and an orifice on an outer peripheral portion of the partition member is provided between the partition member and the diaphragm. And a second liquid chamber connected to the second orifice is set in the inner part of the liquid chamber to cope with vibrations in a wide frequency range such as shake vibration and idle vibration. (Japanese Patent Laid-Open No. 9-2
No. 10117).

[0005]

By the way, in the liquid filled type vibration damping device having the above-mentioned double orifice, in particular, the orifice length and the orifice cross-sectional area of the partition body, and the elastic modulus of both diaphragms, etc., are required to have the desired vibration. In addition to being an important factor in exhibiting the damping function, durability and sealing properties for maintaining the vibration damping function are also important. Furthermore, it is necessary to consider the assemblability of the partition body to the main body.

[0006] From such a viewpoint, the above conventional example 1,
2. Product reliability, mountability (shape and dimensions of swaged part),
When the functionality and the assemblability were examined, in the conventional example 1, the lower partition member was fitted in the lower open bowl-shaped upper partition member, and the lower partition member was cooperated by both. Since the orifice is formed on each of the outer and inner sides of the member, there is a problem in maintaining the sealing properties of the orifice, etc.
In addition, high dimensional accuracy is required for the upper and lower partition members fitted to each other.

On the other hand, in Conventional Example 2, two diaphragms having different elastic moduli are formed by one rubber-like member, so that the dimensional tolerance between the rubber-like member and the partition member does not increase during assembly. In addition, it is necessary to pay attention to the shape of the swaged portion, and the swaging operation is not easy. Further, when the dimensional tolerance increases, the orifice cross-sectional area and the elastic modulus of the diaphragm are hindered, and there is a problem that the functionality is also affected.

[0008]

In view of the above, the present inventors have conducted intensive studies on a vibration isolator, particularly a structure of a partition body, which can satisfy the reliability, functionality, mountability and assemblability of a product. Basically, the partition member has an upper partition member, a lower partition member, and a rubber-like member, and the outer peripheral end of the lower partition member extends radially outward, and the extended portion is provided. While only the vibration-absorbing device body is fixed by caulking to the mounting bracket of the vibration isolator main body, a configuration is adopted in which the outer peripheral edge of the upper end of the upper partition member is pressed and positioned against the outer peripheral edge of the vibration isolator base on the liquid chamber side. At the time of assembling the body inside the main body, the upper partition member abuts against the outer peripheral edge of the vibration-proof base while the main body is turned upside down in the liquid tank while being pressed along the thin film portion of the main body, and then the lower partition member Is placed on top of it, and the extended part is simply fixed by caulking to the mounting bracket. Product reliability, to ensure the functionality, and mountability, found that get easily assembled.

If the upper partition member has a first orifice groove having a U-shaped cross section whose peripheral side surface is open, and is press-fitted along the thin film portion of the apparatus main body,
The first orifice can be easily formed in a space surrounded by the first orifice groove and the thin film portion, and a desired orifice cross-sectional area can be easily obtained.

As the upper partition member, either a member formed by subjecting a single metal plate to drawing or the like to form a first orifice groove on the outer peripheral portion, or a member formed integrally by molding can be used. However, from the viewpoint of obtaining an orifice having a desired cross-sectional area and shape, a molded product is more preferable.

In this case, as the material, either metal or synthetic resin can be used. Examples of the metal molded product include an aluminum molded product. Engineering plastics can be exemplified as synthetic resin molded products. Particularly, polyphthalamide resin or polyphenylene sulfide resin is suitable. These resins have higher strength than 6.6 nylon, are lighter and cheaper than aluminum die-cast products, have high dimensional stability, and are excellent in heat resistance and chemical resistance. In particular, a liquid-filled type vibration damping device is required to have resistance to ethylene glycol, which is a sealed liquid, and also exhibits excellent resistance in this regard. Further, in the liquid-filled type vibration damping device, the temperature of the filled liquid becomes high (140 to 150 ° C.) when the vibration is attenuated.

These polyphthalamide resins or polyphenylene sulfide resins can be used alone, but if reinforced with glass fibers or the like, their strength and rigidity can be further increased. The content of glass fiber is 30
~ 60% by weight is preferred. When the content is less than 30%, the properties of the resin alone are not changed, and there is no point in reinforcing with glass fibers. When the content is more than 60%, the glass fibers may be exposed on the resin surface and the chemical resistance may be reduced. It is.

If the lower partition member is a flat plate-like member that closes the lower opening second orifice groove from below on the inner side of the upper partition member, assembly is easy, and the partition member is fitted inside. There is an advantage that a separate process for press-fitting and a special jig for eliminating residual air included are not required. In addition, since the partition body is pressed against the vibration-isolating base by caulking and fixing the lower partition member, the reliability of the product can be maintained even if the anti-vibration base deteriorates with time.

When the first orifice is made thin and long, and the second orifice is made thick and short, the lower end faces of the first and second orifice groove forming members are different due to the difference in the height of the cross section of the orifice. Although there may be a step between them, even in such a case, the positioning and fixing of the partition body can be performed satisfactorily by forming a convex portion that presses the lower surface of the upper partition member on the outer peripheral portion of the lower partition member.

Further, if the rubber-like member has at least a second diaphragm different from the first diaphragm, and is disposed inside the upper partition member,
Unlike the conventional example 2, there is no need to caulk and fix the rubber-like member to the mounting bracket, so that a diaphragm having a desired elasticity can be formed and maintained.

Here, the second orifice groove forming member may be formed by any of the upper partition member, the lower partition member and the rubber-like member of the above-mentioned basic structure alone or in cooperation with each other. Since the configuration in which only the member is caulked and fixed to position the partition body is adopted, the lower partition member is formed into a simple flat plate shape, and the second orifice groove is formed by either the upper partition member or the rubber-like member. Was adopted. Specifically, either the configuration in which the second orifice groove is formed integrally with the upper partition member on the inner side of the first orifice groove or the configuration in which the second orifice groove is formed integrally with the rubber member is adopted.

As an example of forming the second orifice groove in the upper partition member, a peripheral wall having a U-shaped cross section opened only at the lower side is integrally formed on the inner side of the side peripheral wall of the first orifice groove. it can. In this case, it is preferable that a part of the rubber-like member is interposed and pressed between the lower end of the peripheral wall of the second orifice groove and the lower partition member to form a liquid seal portion of the second orifice.

As a mode of forming the second orifice groove in the rubber-like member, a rubber-like member is attached to the inside of the side peripheral wall of the first orifice groove, and the lower side is opened adjacent to the inside of the side peripheral groove wall. A configuration in which a second orifice groove having a U-shaped cross section is formed can be exemplified. In this case, a structure in which three surfaces except the lower surface are formed of rubber-like members (see FIG. 3), or a structure in which one outer surface of the structure is carried by a side peripheral groove wall of the first orifice groove (see FIG. 4). Either can be adopted.

The rubber-like member can be made of either rubber or resin elastomer as its material, but has a structure having at least a flexible thin film portion for forming the second diaphragm.

The rubber-like member can be fixed to the lower partitioning member by bonding (for example, vulcanized), to the upper partitioning member (for example, vulcanized), or by the upper and lower partitioning members. Any of the compression configurations can be employed.

When the rubber-like member is bonded to the lower partition member, an opening is formed at the center of the lower partition member to secure a space in which the second diaphragm can be deformed, and the second diaphragm is formed on the peripheral wall thereof. (See FIG. 5).

The rubber-like member may be bonded to the upper partition member by vulcanization bonding to the inner side of the side peripheral wall of the first orifice groove or bonding to the inner side of the peripheral wall for forming the second orifice. Can be exemplified.

When the rubber-like member is bonded to the upper partition member, an engaging claw for temporary fixing is formed at a part of the lower end of the rubber-like member, and an engaging hole in which this engaging claw can be engaged. Are formed on the lower partition member, these function as a means for positioning the rubber-like member and the lower partition member in the circumferential direction.

Further, when the rubber-like member is sandwiched between the upper and lower partition members, a rubber flange is formed on the peripheral edge of the rubber-like member, and this flange is formed at the lower end of the peripheral wall of the second orifice groove formed on the upper partition member. A mode in which the pressure is sandwiched between the lower partition member and the lower partition member can be exemplified (see FIG. 7).

[0025]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS [First Embodiment] FIG. 1 is a sectional view of a liquid filled type vibration damping device, and FIG. 2 is a perspective view of a partition.
The liquid filling type vibration damping device 1 according to the present embodiment includes an upper mounting bracket 2 attached to a vibration generator such as an engine.
A lower mounting bracket 3 attached to the vehicle body; a vibration-proof base 4 made of a rubber-like elastic body that connects these two mounting brackets 2, 3 to each other;
And a first diaphragm 6 that forms a liquid chamber 5 with the vibration-proof base 4. The main body of the apparatus is composed of a main liquid chamber 5 a and a sub liquid chamber 5 a. A partition 7 is provided for partitioning the chamber 5b from the chamber 5b.
Two orifice grooves 23, 31 and a second diaphragm 33
The two orifice grooves exhibit a vibration damping function in different frequency ranges and a vibration insulating function of the vibration-proof base 4.

The upper mounting member 2 is formed in a flat plate shape, and a mounting bolt 9 projecting upward and supporting an engine or the like is fixed at the center thereof. In addition, on the upper surface of the upper mounting bracket 2, a base end portion of a stopper metal fitting 10 (stabilizer metal fitting) having a cross section that protrudes laterally from the upper side to absorb large displacement is positioned and fixed by a screw 11. I have.

The lower mounting member 3 comprises a bottomed cylindrical portion 13 having an outer flange 13a expanded at the upper end, and a cylindrical body portion 14 having a lower end fastened to the outer flange 13a from the outside. ing.

At the bottom of the bottomed cylindrical portion 13, a fixing bolt 15 for fixing to the vehicle body side is fixed. Cylindrical body 14
The lower end flange 14a is expanded at the lower end, and the lower end flange 14a and the outer flange 13
The first diaphragm 6 and the outer peripheral portion of the lower partition member 27 of the partition body 7 are sandwiched therebetween. Further, a fastening portion 16 is extended from a front end of the lower end flange 14a. The fastening portion 16 has a U-shaped cross section when the outer flange 13a of the bottomed cylindrical portion 13 is inserted therein and caulked so as to surround it from the outside.

The upper portion of the cylindrical body 14 is tapered outward in the upper part, and the expanded portion 1
A flange 17 is formed at a part of the upper end of 4b so as to face the tip of the stopper fitting 10.
The vibration-proof base 4 is vulcanized and bonded so as to surround the outer periphery of the flange 17.

The anti-vibration base 4 is made of a rubber-like elastic body formed in an umbrella shape, and the cylindrical body 1 of the upper mounting bracket 2 and the lower mounting bracket 3.
4 while being vulcanized and adhered to the flange 1 of the cylindrical body portion 14.
7 is extended to a position facing the inner surface of the distal end of the stopper fitting 10, and the extended portion is the large displacement absorbing stopper portion 2.
It is set to 0. The stopper 1 has a flange 1
A reinforcing member 21 is buried and interposed between the stopper 7 and the stopper member 10. Further, the rubber-like elastic body of the vibration-proof base 4 extends in a thin film shape to the lower end of the inner wall of the cylindrical body portion 14, and the partition 7 is pressed into the inner peripheral wall of the thin film portion 22.

The first diaphragm 6 has a flexible rubber-like elastic film, and the inner end of an annular support fitting 25 is embedded and integrated into the outer periphery thereof. It is mounted on the outer flange 13a of the portion 13. The first diaphragm 6, the lower surface portion of the vibration isolating base 4, and the thin film portion 2 thereof
A space surrounded by 2 is a liquid chamber 5, and a partition 7 is arranged so as to partition the liquid chamber 5 up and down.

As shown in FIGS. 1 and 2, the partitioning member 7 is composed of an upper partitioning member 26, a lower partitioning member 27, and a rubber-like member 28.
The outer peripheral end of the lower partition member 27 is extended radially outward, and only the extended portion 29 is provided with the bottomed cylindrical portion 13 and the cylindrical trunk portion of the lower mounting member 3. 14 fastening parts 1
6 while being fixed to the notch stepped portion 30 having an L-shaped cross-section and having an upper end outer peripheral edge of the upper partition member 26 formed in an annular shape on the liquid chamber side outer peripheral end of the vibration-proof base 4. .

The upper partition member 26 is an annular molded product, and has a first orifice groove 23 having a U-shaped cross section with an open peripheral side surface formed in the circumferential direction. A space surrounded by the inner peripheral wall of the thin film portion 22 of the vibration isolation base 4 is a first orifice 24. The first orifice groove 23 has a main liquid chamber side inlet / outlet 24a formed at an upper end wall thereof and a communication hole 24b communicating with the sub liquid chamber side at a lower end wall thereof. A vertical partition wall 25 (see FIG. 6) for preventing a short circuit between the side entrance 24a and the communication hole 24b is formed so as to close the first orifice groove 23.

The material of the upper partition member 26 may be made of aluminum or engineering plastic. In particular, 30 to polyphthalamide (PPA) resin or polyphenylene sulfide (PPS) resin
Those containing up to 60% of glass fibers are preferred.
These glass fiber-containing resins have high strength, high rigidity and high dimensional stability. In addition, in a liquid-filled type vibration damping device, resistance to ethylene glycol as a filling liquid and resistance to a high-temperature filling liquid at the time of vibration damping. Particularly excellent in heat resistance.

The side groove wall 2 of the first orifice groove 23
A convex portion 23b is formed on the inner side wall surface of 3a in the circumferential direction in order to improve the vulcanization adhesion with the rubber-like member 28, but even if the convex portion 23b does not exist, the rubber-like portion 23a is formed. Member 28
Can be fixed to the upper partition member 26 sufficiently.

The rubber member 28 is made of rubber or resin elastomer, and has an orifice portion 32 in which a second orifice groove 31 is formed, and an arc-shaped concave inside the orifice portion 32 on the main liquid chamber side. A flexible thin film-shaped second diaphragm 33 is integrally vulcanized and formed,
The outer peripheral portion of the orifice portion 32 is vulcanized and bonded to the inner surface of the first orifice groove wall 23a of the upper partition member 26.

The orifice portion 32 has two substantially concentric peripheral walls 32a and 32b, and an annular top portion 32 covering the upper surface thereof.
The lower end of the peripheral walls 32a and 32b is pressed against the lower partition member 27 so that the second orifice groove 31 is closed. Thereby, a second orifice 35 is formed in the space.

The second orifice 35 communicates with the second auxiliary liquid chamber 5c surrounded by the second diaphragm 32 and the lower partition member 27 by an opening 36 formed in the inner peripheral wall 32b. An opening 37 formed in the lower partition member 27 communicates with the first sub-liquid chamber 5b. The second orifice groove 31 has an inner peripheral wall 32b.
A rubber-like vertical wall (not shown) for preventing short circuit between the second sub liquid chamber side opening 36 and the first sub liquid chamber side opening 37 is provided.

The lower partition member 27 is a metal disk-shaped flat plate, and has a function of closing the second orifice groove 31 of the rubber member 28 from the lower side inside the upper partition member 26. And the upper partition member 26
An annular convex portion 43 is formed by press molding or the like, which abuts against the lower surface of the (lower end wall portion of the first orifice groove) and presses it upward. The convex portion 43 has an opening 41 communicating with the communication hole 24b of the first orifice groove 23 and opening to the first sub liquid chamber 5b. The outer peripheral side is extended from the convex portion 43, and the extended portion 29 is caulked and fixed to the fastening portion 16 between the bottomed cylindrical portion 13 and the cylindrical body portion 14 of the lower mounting member 3.

In order to assemble the liquid filling type vibration damping device 1 having the above structure, first, the upper partition member 26 of the partition 7 and the rubber member 28 are vulcanized and bonded in the atmosphere. That is,
An upper partition member 26 having a first orifice groove 23 of a predetermined size formed on the periphery is molded with aluminum or the like, and a rubber member 28 is vulcanized and bonded to the inside of the groove wall 23a of the upper partition member 26, The second orifice groove 31 and the second diaphragm 33 that are open to the sub liquid chamber side are formed.

Next, in the liquid, the lower opening of the cylindrical body portion 14 of the lower mounting member 3 connected to the upper mounting member 2 via the vibration-proof base 4 is set upward, and the inside of the lower mounting member 3 is set upward. With the air removed, the upper partition member 26 is removed from the rubber-like member 2.
8 and press-fit along the thin film portion 22 of the anti-vibration base 4 until the outer peripheral edge of the upper end reaches the cutout step 30 of the anti-vibration base 4. From above, the lower partition member 27 is press-fitted or inserted along the fastening portion 16 of the tubular body portion 14 so that the communication hole 24 and the opening 41 face each other, and then the annular support of the first diaphragm 6 is formed. The metal fitting 25 is press-fitted or inserted into the fastening portion 16.

These operations are performed in the liquid, and after the liquid is sealed in the space between the first diaphragm 6 and the vibration-proof base 4, the liquid is taken out to the atmosphere to adjust the residual liquid, and The bottomed cylindrical portion 13 is attached to the lower end flange 14a of the cylindrical body portion 14.
The flange 13a is fitted, and the fastening portion 16 is caulked and fixed to complete the assembly.

Then, only by caulking and fixing the lower partition member 27, the partition body 7 is formed by the notch step 30 of the vibration-proof base 4.
And the first orifice 24 and the second orifice 35 having a predetermined length and a cross-sectional area are liquid-sealed and can be easily assembled.
Therefore, for example, the first orifice 24 functions as an orifice for preventing a thin and long shake vibration (for example, 10 to 15 Hz) and the second orifice 35 functions as an orifice for preventing a thick and short idle vibration (30 to 40 Hz). Can be done.

In particular, by integrally molding the second orifice groove 31 and the second diaphragm 33 with the rubber-like member 28, the dimensions of the rubber-like member 28 can be easily changed, and the required value can be changed. Short-term and inexpensive.

Further, the upper partition member 26 obtained by vulcanizing the rubber member 28 and the lower partition member 27 can be separately press-fitted or inserted in the liquid tank.
This eliminates the need for a separate process of press-fitting the inside into the upper partition member and a special jig for expelling the residual air contained therein, thereby simplifying the assembling process, and providing an inexpensive and highly reliable liquid-filled vibration isolator.

[Second Embodiment] FIG. 3 is a sectional view of a vibration isolator according to a second embodiment. In this embodiment, rubber-like temporary fixing engagement claws 39 are integrally formed at a plurality of locations at the lower end of the inner peripheral wall 32b of the rubber-like member 28, and before the partition body 7 is inserted into the main body, the engagement claws 39 are formed. 39 is engaged with the plurality of engagement holes 40 formed in the lower partition member 27, and the communication hole 24 b of the upper partition member 26 and the opening 41 on the auxiliary liquid chamber side formed in the lower partition member 27 are accurately aligned. To be positioned.

In this embodiment, before the partition 7 is pressed into the liquid chamber of the cylindrical body 14, the upper and lower partition members 26 and 27 and the rubber member 28 constituting the partition 7 are temporarily provided. Since all the components are stopped and press-fitted after assembly, it is not necessary to align the communication hole 24b of the upper partition member 26 with the opening 41 of the lower partition member 27. Further, even with the temporarily fixed partition body 7, the residual air can be removed from the gap between the two, so that, similarly to the above-described embodiment, another step of fitting and inserting the lower partition member 27 and the residual air included therein are removed. No special jigs are needed to drive out. Other configurations and effects are
This is the same as in the first embodiment.

[Third Embodiment] FIG. 4 is a sectional view showing a third embodiment. This embodiment is different from the first embodiment in that the second orifice 35
Are formed by an inner side wall surface of the side groove wall 23a of the first orifice groove 23, an orifice groove 31 having an L-shaped cross section formed on the outer peripheral side of the rubber member 28, and a flat lower partition member 27. It is composed of three members. Therefore, in the rubber-like member 28, unlike the first embodiment, the outer peripheral wall 3
2a is abolished and replaced with the first orifice groove 2
The third groove wall 23b is used.

The groove wall 23 of the first orifice groove 23
The convex portion 23b is also eliminated on the inner surface of a, and instead, an inner flange 46 is formed at the upper end of the groove wall 23b to prevent the rubber-like member 28 from coming off. Since the rubber-like member 28 is inherently vulcanized and bonded to the upper partition member 26, the rubber-like member 28 can be sufficiently fastened even without the inner flange 46. The other configuration and operation and effect are the same as those of the first embodiment.

[Fourth Embodiment] FIG. 5 is a sectional view of a vibration isolator according to a fourth embodiment, and FIG. 6 is a perspective view of the partition member of the vibration isolator. The partitioning body 7 of the present embodiment includes an upper partitioning member 26, a lower partitioning member 27, and a rubber-like member 28.
The first point is that it is a member configuration, the outer peripheral edge of the upper partition member 26 is pressed against the notch step 30 of the vibration isolating base 4, and only the extending portion 29 of the lower partition member 27 is swaged and fixed. Although the second embodiment is common to the first embodiment, the first embodiment is substantially different from the first embodiment in that the second orifice groove 31 is provided in the upper partition member 26 and the rubber-like member 28 is vulcanized and bonded to the lower partition member 27. And different. Except for the configuration of the partition 7, the configuration is the same as that of the first embodiment, and the description thereof is omitted.

The upper partition member 26 is a molded product, and is formed with a first orifice groove 23 having a U-shaped cross section with its peripheral side surface open, and is formed in the circumferential direction. The upper surface plate 51 which covers the inner upper surface than the side groove wall 23a is formed integrally with the side groove wall 23a, and the annular peripheral wall 50 is formed integrally inside the groove wall 23a. The peripheral wall 50, the upper surface plate 51, and the groove wall 2
A second orifice groove 31 is formed in the upper partition member 26 and surrounded by an open U-shaped cross section at 3a.

The material of the upper partition member 26 is made of aluminum or engineering plastic, particularly, polyphthalamide (PPA), as in the first embodiment.
A resin or a polyphenylene sulfide (PPS) resin containing 30 to 60% of glass fiber can be suitably used.

On the other hand, the lower partition member 27 is an annular flat plate member having a central opening 53 at the center and opening to the sub-liquid chamber side, and the edge of the central opening 53 is bent upward and the bent portion is formed. The rubber-like member 28 is vulcanized and adhered to the opening edge 53a including. The lower partition member 27
The configuration of the outer peripheral extension portion 29 and the outer peripheral convex portion 43 is the same as that of the first embodiment.

The rubber member 28 includes a second diaphragm 33 formed in an arc-shaped concave shape on the side of the auxiliary liquid chamber, and the lower partition member 2.
7 is vulcanized and bonded so as to sandwich the opening edge of the sealing member 7, and the upper surface side is elastically inserted between the lower end of the inner peripheral wall 50 of the upper partition member 26 and the upper surface of the lower partition member 27. 5
5 and an annular guide portion 56 which functions as a press-fit guide into the inner surface side of the peripheral wall 50 and has an opening in a part are integrally formed.

If the annular guide portion 56 of the rubber member 28 is fitted inside the peripheral wall 50 of the upper partition member 26, the second
A space surrounded by the diaphragm 33 and the upper plate 51 of the upper partition member 26 becomes the second sub liquid chamber 5c, and the peripheral wall 50
And, it comes to communicate with the second orifice 35 through communication holes 57 and 58 formed in the annular guide portion 56.

To assemble the vibration isolator 1 having the above configuration,
First, the upper partition member 26 and the lower partition member 27 to which the rubber-like member 28 is vulcanized and bonded are assembled in the atmosphere. In this case, the guide portion 56 of the rubber-like member 28 is connected to the upper partition member 2 so that the communication hole 24b of the first orifice groove 23 and the auxiliary liquid chamber side opening 41 of the lower partition member 27 are located at predetermined positions.
6 and is temporarily fixed.

Then, in the liquid tank, the opening at the lower end of the cylindrical body 14 is set upward, the partition 7 is pressed into the thin film portion 22 of the vibration-proof base 4 and then the first diaphragm is inserted. 6 are press-fitted, taken out to the atmosphere, adjusted for residual liquid, and then caulked and fixed at the fastening portion 16 to complete the assembly.

As described above, by integrally forming the two orifice grooves 23 and 31 on the upper partition member 26, the groove dimensions that determine the respective set frequencies can be stably maintained, and the reliability is high. An anti-vibration device can be provided. In addition, although the upper and lower partition members 26 and 27 are temporarily fixed, the residual air can be removed from the gap, so that a separate process for press-fitting the lower partition member 27 and a special jig for driving out the internal residual air are not required. There are advantages.

[Fifth Embodiment] FIG. 7 is a sectional view of an anti-vibration device 1 according to a fifth embodiment, and FIG. 8 is a perspective view of the partition member. Partition body 7 in this embodiment
However, the difference from the fourth embodiment is that the rubber member 28 is sandwiched between the upper and lower partition members 26 and 27 without being vulcanized and bonded thereto.

That is, the lower partition member 27 of the partition member 7 has the same configuration as that of the first embodiment, and the upper partition member 26 has the upper surface plate 51 of the fourth embodiment.
Are formed with a plurality of through-holes 61 to communicate with the main liquid chamber side.

After the rubber-like member 28 is vulcanized and formed independently, the lower end outer peripheral flange rubber portion 60 is attached to the upper partition member 2.
6 is sandwiched between the lower end of the peripheral wall 50 and the flat portion of the lower partition member 27. This rubber-like member 28
A second diaphragm 3 formed in an arc concave shape on the main liquid chamber side
3, sealing flange rubber 60 inserted and elastically contacted between the lower end of the inner peripheral wall 50 of the upper partition member 26 and the upper surface of the lower partition member 27, and functions as a press-fit guide to the inner surface side of the peripheral wall 50. An annular guide portion 56 having an opening 57 in a part thereof
And are integrally formed.

After the rubber-like member 28 is fitted into the peripheral wall 50 of the upper partition member 28 during assembly and temporarily fixed thereto, the upper partition member 26 and the main body are placed in the liquid tank in the same manner as in the first embodiment. After press-fitting, the lower partition member 27 is inserted, the first diaphragm 6 is inserted, and these are taken out into the atmosphere.
The extension portion 29 of the lower partition member 27 is swaged and fixed, but a separate step of press-fitting the lower partition member 27 is unnecessary, and a special jig for purging the residual air included is unnecessary. Is the same as in the fourth embodiment.

The feature of such a configuration is that the rubber-like member 2
By sandwiching 8 between the upper and lower partition members 26 and 27, a configuration can be obtained that is less affected by dimensional variations, aging of rubber, and the like.

[0064]

As is apparent from the above description, according to the present invention, the partition body is made up of three members, an upper partition member, a lower partition member, and a rubber-like member, and the outer peripheral end of the lower partition member has a radius. The outer peripheral edge of the upper partition member is attached to the outer peripheral end of the vibration isolating base on the liquid chamber side while the extended portion is caulked and fixed to the mounting bracket of the vibration isolator main body. Since the positioning is performed by pressing, it is possible to provide an anti-vibration device that can be easily assembled, and that can reliably remove air mixed around the partition body before assembling parts.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view of a liquid filling type vibration damping device showing a first embodiment of the present invention.

FIG. 2 is a perspective view of the partition body.

FIG. 3 is a cross-sectional view of a liquid filled type vibration damping device showing a second embodiment.

FIG. 4 is a sectional view of a liquid filled type vibration damping device showing a third embodiment.

FIG. 5 is a sectional view of a liquid filling type vibration damping device showing a fourth embodiment.

FIG. 6 is a perspective view of the partition.

FIG. 7 is a sectional view of a liquid filling type vibration damping device showing a fifth embodiment.

FIG. 8 is a perspective view of the partition.

[Explanation of symbols]

 REFERENCE SIGNS LIST 1 liquid-filled vibration isolator 2 upper mounting bracket 3 lower mounting bracket 4 vibration-proof base 5 liquid chamber 5 a main liquid chamber 5 b sub-liquid chamber 6 first diaphragm 7 partition 23 first orifice groove 24 first orifice 26 Upper Partition Member 27 Lower Partition Member 28 Rubber Member 30 Notch Step 33 Second Diaphragm

Continued on the front page (72) Inventor Hirokazu Masui 1-17-18 Edobori, Nishi-ku, Osaka-shi, Osaka Toyo Tire & Rubber Co., Ltd. (72) Inventor Tsutomu Hashimoto 1-17-18 Edobori, Nishi-ku, Osaka-shi, Osaka Toyo Tire Industrial Co., Ltd.

Claims (16)

[Claims] 1. A liquid-filled vibration isolator provided with a partition for dividing a liquid chamber formed between a vibration isolating base of the vibration isolator main body and a first diaphragm into a main liquid chamber and a sub liquid chamber. In the above, the partition body has an upper partition member having a first orifice groove having a U-shaped cross section whose peripheral side surface is open, and a lower orifice second lower orifice groove on the inner side of the upper partition member. A flat lower partition member closed from the side,
And a rubber-like member having a second diaphragm separately from the above-mentioned diaphragm and disposed on the inner side of the upper partition member, wherein the outer peripheral end of the lower partition member has a radial direction. It is extended outward, and only the extending portion is caulked and fixed to the mounting bracket of the vibration isolator main body, so that the outer peripheral edge of the upper end of the upper partition member is at the outer peripheral end of the vibration isolating base on the liquid chamber side. A liquid filled vibration isolator that is pressed and sealed. 2. The liquid filling type vibration damping device according to claim 1, wherein said second orifice groove is formed integrally with said upper partition member on the inner side of said first orifice groove. 3. The liquid-filled vibration isolator according to claim 1, wherein said second orifice groove is formed in said rubber-like member. 4. A liquid filled type vibration damping device according to claim 1, wherein said rubber-like member is bonded to said lower partition member. 5. A liquid filled vibration isolator according to claim 1, wherein said rubber-like member is bonded to said upper partition member. 6. A positioning means for circumferentially positioning the rubber-like member and the lower partition member, the positioning means comprising: a temporarily engaging engagement claw formed at a lower end of the rubber-like member; 6. The liquid-filled type vibration damping device according to claim 5, further comprising an engagement hole formed in said lower partition member so as to be able to engage a dovetail. 7. A liquid filled vibration isolator according to claim 1, wherein said rubber-like member is sandwiched between said upper and lower partition members. 8. A liquid-filled protection device according to claim 1, wherein a part of said rubber-like member is pressed against said lower partition member to form a liquid-sealed portion of said second orifice groove. Shaking device. 9. The liquid filled vibration isolator according to claim 1, wherein said upper partition member is an aluminum molded product. 10. The liquid filled type vibration damping device according to claim 1, wherein the upper partition member is a molded product made of synthetic resin. 11. A liquid filled type vibration damping device according to claim 10, wherein said upper partition member is made of polyphthalamide resin. 12. A liquid filled vibration isolator according to claim 10, wherein said upper partition member is made of polyphenylene sulfide resin. 13. A liquid filling type vibration damping device, wherein the upper partition member according to claim 11 or 12 is reinforced with glass fiber. 14. The liquid filled type vibration damping device according to claim 13, wherein the glass fiber content is 30 to 60% by weight. 15. A projection which presses the upper partition member upwardly at an outer peripheral portion of the lower partition member.
4. The liquid-filled vibration damping device according to any one of 4. 16. A partition according to any one of claims 1 to 15.