JPH0417291B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION Technical Field The present invention relates to a vibration isolating support, and the present invention relates to a fluid-filled elastic support that has excellent vibration isolating properties in high and low frequency ranges and is particularly suitable for use in automobile engine mounts. It is related to the support.

Conventional technology Conventionally, a structure in which a rubber block is interposed between two mounting brackets has been used as a vibration-proof rubber mount (vibration-proof support) for automobile engine mounts, body mounts, etc. If rubber with a small dynamic spring constant is used to reduce vibration and noise in the area, the loss coefficient of such rubber is small, and therefore the damping coefficient is also small, which fully satisfies the characteristics required of a vibration-proof rubber mount. I didn't get it. However, anti-vibration rubber mounts such as engine mounts have low dynamic spring characteristics to reduce vibration and noise in the high frequency range (near 100Hz), and also reduce vibration in the low frequency range (near 15Hz). High attenuation characteristics (large loss coefficient)
This is because it is required to have the following.

On the other hand, in order to meet such demands, various types of elastic supports, so-called fluid-filled mounts, have been proposed that utilize the elasticity of rubber and the flow resistance of fluid. Unexamined Japanese Patent Publication 1987-
The damper device or the elastic buffer support proposed in Publication No. 9340 etc. includes a rubber elastic body provided on one side of a partition member to define an operating chamber within the rubber elastic body, and the partition member An equilibrium chamber surrounded by a flexible member such as a flexible thin film is formed on the other side of the chamber, and a predetermined incompressible fluid is sealed in the working chamber and the equilibrium chamber. A movable plate communicated with the equilibrium chamber via an orifice and supported by the partition member is provided so as to be movable a predetermined distance by pressure applied to the fluid in the working chamber. This is intended to provide an effective vibration damping effect.

In other words, in general, in this type of fluid-filled mount, when high-frequency vibration is input, the fluid in the working chamber acts as a rigid body. Therefore, even if rubber with a low dynamic spring constant is used as the elastic body, the mount as a whole The dynamic spring constant was high, making it difficult to achieve an effective vibration reduction effect, but this can be overcome by changing the internal volume of the working chamber (absorbing fluid pressure) due to the movement of the movable plate. Furthermore, when low-frequency vibrations are input, the movable plate is prevented from moving freely, and the fluid is allowed to flow from the working chamber to the equilibrium chamber through the orifice. The loss coefficient of the mount as a whole is increased by the effects of resonance, flow resistance, etc., and the damping characteristics against low frequency vibrations can be effectively exhibited.

Problems As described above, the fluid-filled mount using a movable plate proposed in JP-A-53-5376 and JP-A-57-9340 cleverly solves the problems inherent in conventional fluid-filled mounts. This is an excellent solution, but in the case of a fluid-filled mount having such a structure, an orifice is provided in the partition member that partitions the working chamber and the equilibrium chamber to allow these chambers to communicate with each other, and Since it is necessary to support the movable plate so that it can be moved a predetermined distance, there is a problem that the structure of such a partition member becomes extremely complicated, which increases the manufacturing cost of the partition member and also makes it difficult to assemble it. This makes the workability complicated and troublesome, and furthermore, the shape of the partition member itself becomes large, resulting in an inherent problem of increasing the size of the entire mount.

Moreover, the orifice that communicates the working chamber and the equilibrium chamber is formed inside a partition member made of a material such as resin or aluminum die-casting, and the thickness of the partition member (plate thickness) is made thicker in terms of its strength. Because of this, the thickness of the supporting portion at the peripheral edge of the partition member becomes large, which also has the disadvantage that the shape of the partition member supporting portion of the product becomes large.

Solution The present invention has been made to solve the problems in the conventional fluid-filled mount using a movable plate, and is characterized by the fact that one side of the partition means A rubber elastic body is provided to define an operating chamber into which vibrations are input, and an enclosure, at least a part of which is made of a flexible thin film, is provided on the other side of the partition means. forming an equilibrium chamber for absorbing changes in the internal pressure of the chamber, sealing a predetermined incompressible fluid in the working chamber and the equilibrium chamber, and communicating the working chamber and the equilibrium chamber through an orifice; Furthermore, in the vibration-proof support structure, the movable plate supported by the partition means can be moved a predetermined distance by the pressure applied to the fluid in the working chamber, in which: An outer hat member and an inner hat member made of press-formed metal plates each exhibiting a hat shape consisting of a cylindrical portion and a flange portion are used, and they are inserted into the bottomed cylindrical portion of the former and then inserted into the bottomed cylindrical portion of the latter. (b) between the cylindrical wall of the bottomed cylindrical portion of the outer hat member and the cylindrical wall of the bottomed cylindrical portion of the inner hat member; A gap is provided to form a circumferential annular space, and a through hole for communicating the annular space with the working chamber is provided at the peripheral edge of the bottom of the bottomed cylindrical portion of the outer hat member, and the annular space is connected to the annular space. The orifice is formed by providing through holes that communicate with the equilibrium chamber in the cylindrical walls of the bottomed cylindrical portions of the inner hat member, while (c) A space in which the movable plate can be accommodated and moved a predetermined distance is provided between the center part of the bottom of the shaped part and the center part of the bottom of the bottomed cylindrical part of the inner hat member, and the space is A hole communicating with the working chamber and the equilibrium chamber is provided in the two bottom portions, and the pressure of the incompressible fluid in the working chamber is transferred to the equilibrium chamber through movement of a movable plate accommodated in the cavity. The reason is that it is made to act on the side.

Therefore, in the structure according to the present invention, the annular space constituting the orifice as well as the cavity in which the movable plate is accommodated are separated by simply overlapping the outer and inner hat members serving as partition means. are formed at the same time, and the movable plate housing cavity and the annular space are formed in the bottomed cylindrical portion of the hat member, and are arranged so as to be located in the working chamber or the equilibrium chamber. The structure of the partition means is extremely simplified, and the flange portion that serves as the support portion thereof can be made extremely thin.

In particular, in the present invention, the outer hat member and the inner hat member constituting the partition means are
Since it is constructed from a press-molded metal plate, it is extremely easy to manufacture, and the manufacturing cost can be extremely low.

Further, the circumferential annular space formed by the gap between the cylindrical wall of the bottomed cylindrical portion of the outer hat member and the cylindrical wall of the bottomed cylindrical portion of the inner hat member is a part of the circumferential direction. It is preferable that the annular space is closed (blocked) at the outer and inner hatch members, and communication holes are provided in each of the outer and inner hat members so as to communicate the annular space with the working chamber and the equilibrium chamber, respectively. By selecting the relative rotational position of these two members when overlapping the outer and inner hat members, the length of the annular space between the communication holes provided in these two members can be arbitrarily set. This gives rise to the advantage that the length of the orifice can be set arbitrarily.

EXAMPLES Hereinafter, in order to clarify the present invention more specifically, examples of the present invention will be described in detail based on the drawings.

First, in FIG. 1 showing an example of an engine mount according to an embodiment of the present invention, reference numeral 2 denotes a rubber block that is a rubber elastic body, and has a thick-walled substantially truncated conical cylinder shape with a hollow space inside. The top end thereof is fixed to the retainer 6 fixed portion of the mounting plate 4 by integral vulcanization molding or the like. Further, a mounting bolt 8 is erected at the center of the mounting plate 4 with its threaded portion facing outward. Further, one side portion of the mounting plate 4 is bent into a substantially L shape to form a hanging stopper portion 10. A stopper rubber 12 is fixed to the inside of the stopper portion 10 to a predetermined thickness.

On the other hand, on the bottom side of the lower end of the rubber block 2, an annular support fitting 14 is integrally fixed to the outer periphery of the rubber block 2 by vulcanization adhesive or the like, and is substantially opposed to the mounting plate 4, respectively. Outer hat member 1 made of metal plate material formed by press processing
6 and an inner hat member 18 are arranged, and this partition means liquid-tightly seals the lower opening of the rubber block 2 so that an operating chamber is formed in the rubber block 2. 2
0 is formed.

Further, on the outside of the partitioning means constituted by the outer hat member 16 and the inner hat member 18, in other words, on the side opposite to the side where the working chamber 20 is provided, there is a diaphragm 22 made of a thin rubber film.
An equilibrium chamber 24, which is a sealed space, is formed between the diaphragm 22, which functions as an enclosure, and the partition means.

And the working chamber 20 formed in this way
A predetermined incompressible fluid such as water or alkylene glycol is sealed inside the equilibrium chamber 24.
As will be described later, as the fluid flows from the working chamber 20 into the equilibrium chamber 24 through a predetermined orifice, the diaphragm 22 bulges outward.
It is adapted to be deformed so that the internal volume within the balance chamber 24 can be increased.

A plate-shaped protective fitting 26 is disposed further outside the diaphragm 22 so as to cover it, and a seal portion 28 formed continuously from the end of the rubber block 2 and the peripheral edge of the protective fitting 26 are disposed to cover the diaphragm 22. The outer peripheral end of the support fitting 14 is caulked from the outermost side with the flanges of the superimposed outer and inner hat members 16 and 18 and the outer peripheral edge of the diaphragm 22 being sandwiched between them. As a result, each of these members is integrated with the rubber block 2, and the working chamber 20 and the equilibrium chamber 24 are kept liquid-tight. Further, a mounting bolt 30 is embedded in the center of the protective fitting 26 with its threaded portion protruding outward. Although not shown, the protective fitting 26 is provided with an appropriate number of communication holes that allow the space between the protective fitting 26 and the diaphragm 22 to communicate with the outside. Furthermore, support fittings 1
A stopper fitting 32 is fixedly attached to a portion of the mounting plate 4 corresponding to the stopper part 10 of No. 4 and is suspended, and the interference between the stopper fitting 32 and the stopper part 10 causes the first In the figure, excessive deformation in the left-right direction can be prevented.

By the way, in such an engine mount as a vibration-proof support, the working chamber 20 and the equilibrium chamber 24 are
As is clear from FIGS. 2 to 6, the partitioning means is composed of an outer hat member 16 and an inner hat member 18, each of which is made of a pressed product of a metal plate. The bottomed cylindrical portion 36 of the inner hat member 18 is fitted inside the bottomed cylindrical portion 34 of the inner hat member 16 and overlapped with each other, and the overlapped flange portions 38 and 40 of these members are placed at multiple locations in the circumferential direction (for example, 4
It is fixed by spot welding or the like at the points).

Since the diameter of the bottomed cylindrical portion 34 of the outer hat member 16 is larger than the diameter of the bottomed cylindrical portion 36 of the inner hat member 18, by overlapping these two members, A predetermined gap is formed between the bottomed cylindrical portions 34 and 36, and an annular space 42 is formed in the circumferential direction.
As is clear from FIG. 2 and FIG.
The cylindrical wall of No. 6 is made to protrude laterally at one location in the circumferential direction to form the blocking protrusion 44, so that the outer hat member 1 of the blocking protrusion 44
By contacting the inner surface of the cylinder wall of the bottomed cylindrical portion 34 of 6,
The annular space 42 is partially blocked in the circumferential direction.

Further, on the side surface of this blocking protrusion 44, as shown in FIG.
As is clear from FIGS. 3 and 6, a rectangular communication hole 46 is bored, and this communication hole 46 allows
Communication between the equilibrium chamber 24 formed below the partition means and the annular space 42 is achieved. moreover,
A rectangular communication hole 48 is provided at a predetermined position on the outer peripheral edge of the bottom of the bottomed cylindrical portion 34 of the outer hat member 16, and the communication hole 48 connects the working chamber 20 located above the partition means with the annular shape. It is communicated with a space 42.

Therefore, the annular space 42 formed by the outer hat member 16 and the inner hat member 18, which are such partition means, and the communication hole 46 provided therein,
48 constitutes a predetermined orifice that allows the upper and lower working chambers 20 and equilibrium chambers 24 to communicate with each other.

Further, the bottom of the bottomed cylindrical portion 34 of the outer hat member 16 has a predetermined height (depth) that further protrudes outward.
A second bottom portion 50 is formed to have a smaller diameter than the diameter of the bottomed cylindrical portion 34, and a plurality of working holes 52 are provided in the second bottom portion 50. Further, the bottom portion of the bottomed cylindrical portion 36 of the inner hat member 18 corresponding to the second bottom portion 50 of the outer hat member 16 also has the working hole 52.
A plurality of operation holes 54 similar to the above are provided.

By superimposing the inner hat member 18 on the outer hat member 16, the presence of the second bottom portion 50 of the outer hat member 16 allows the bottom portion of the outer hat member 16 and the inner hat member 18 to A predetermined space is formed between the bottom and the bottom, and a disc-shaped movable plate 56 made of a rubber material and having a predetermined thickness is accommodated therein. Therefore, the movable plate 56 accommodated in the cavity formed between these two bottom parts is attached to each hat member 1.
The working chamber 2 through the working holes 52 and 54 of 6 and 18.
Therefore, when the pressure of the incompressible fluid in the working chamber 20 is applied to the movable plate 56, the movable plate 56 is moved a predetermined distance. As a result, the pressure is transmitted to the equilibrium chamber 24 side. Note that the movement of the movable plate 56 is regulated by the second bottom portion 50 of the outer hat member 16 and the bottom portion of the inner hat member 18.

Therefore, in the case of an engine mount having such a configuration, the mounting bolts 8 of the mounting plate 4 and the mounting bolts 30 of the protective metal fittings 26 are used to connect the power unit and the vehicle body in which the engine, transmission, etc. are integrated. A movable plate 56 and orifices 42, 52, 5 are interposed and fixed between the movable plate 56 and orifices 42, 52,
Due to the presence of 4, excellent low dynamic spring characteristics and high damping characteristics are exhibited.

That is, when high frequency vibration is input, the pressure applied to the incompressible fluid in the working chamber 20 can be moved a predetermined distance into the space between the bottoms of the outer hat member 16 and the inner hat member 18 that constitute the partition means. act on the accommodated movable plate 56 through the action hole 52 of the outer hat member 16;
As a result of this movement, the force is transmitted to the equilibrium chamber 24 side through the action hole 54 of the inner hat member 18, so that the spring characteristics of the rubber block 2 can be effectively utilized, thereby increasing the dynamic spring constant as a whole. Therefore, it is possible to effectively reduce vibration noise in the targeted high frequency range. On the other hand, when low frequency vibration is input, the working chamber 20 and the equilibrium chamber 24 are connected to each other via the orifices 42, 46, 48 formed by overlapping the outer hat member 16 and the inner hat member 18. In between, an effective flow of the incompressible fluid contained in each chamber is induced, and energy loss due to the resonance effect and flow resistance of such fluid is formed, resulting in an effective large loss coefficient. Therefore, it is possible to exhibit a high damping effect against low frequency vibrations.

In the engine mount having such a structure, the partition means is constructed by overlapping two hat members 16 and 18, which are press-formed products formed by press working or punching. Therefore, it is extremely easy to manufacture, and its structure is extremely simplified.Also, when assembling it, it is easy to assemble it by simply stacking and fixing them. Installation workability is extremely easy.

Furthermore, in the case of the partition means in the engine mount having the structure as described above, the outer hat member 1
Since the outer circumferential surface of the cylindrical wall of the bottomed cylindrical portion 34 in 6 is arranged in contact with the inner circumferential surface of the working chamber 20, the cylindrical wall of both the outer hat member 16 and the inner hat member 18 constitutes the structure. The orifice to be
The length of the orifice that communicates the working chamber 20 and the equilibrium chamber 24 can be advantageously ensured by forming it along the cylindrical wall with as large a diameter as possible. The vibration damping effect of the fluid flowing inside can be more effectively enjoyed. Note that even when the outer circumferential surface of the bottomed cylindrical portion 34 of the outer hat member 16 is disposed in contact with the inner circumferential surface of the working chamber 20 in this way,
A communication hole 48 that communicates the orifice formed between the cylindrical walls of the outer hat member 16 and the inner hat member 18 with the inside of the working chamber 20 is formed by penetrating the bottom of the bottomed cylindrical portion 34 in the outer hat member 16, Due to the upwardly directed opening, the flow of fluid through the orifice is not obstructed in any way. In addition, a communication hole 46 that communicates this orifice with the equilibrium chamber 24 side is also provided.
In this case, the communication hole 46 is prevented from being blocked by the diaphragm 22 because it is formed by penetrating the cylindrical wall of the bottomed cylindrical portion 36 of the inner hat member 18 and is opened inward. This can be effectively prevented and a more stable flow of fluid through the orifice can be produced.

In addition, when attaching the two hat members 16 and 18 superimposed in this manner, the lower end peripheral edge of the support fitting 14 is attached at the overlapped flange portions 38 and 40, as shown in FIG. Since it is fixed and supported together with the diaphragm 22 and the protective metal fitting 26 by caulking, the shape of the support part is large in size, like the partition member support part in a conventional liquid-filled mount. This no longer caused any problems. However, in the illustrated construction, an annular space 42 of a desired length is formed between the two hat members 16,
Since the orifice is formed between the cylindrical walls of the 18 bottomed cylindrical parts 34 and 36, the overlapping thickness of the flange parts 38 and 40 does not increase due to the formation of such an orifice. That's because there isn't.

Further, FIG. 7 shows an engine mount according to another embodiment of the present invention. In this case, the engine mount is arranged upside down compared to the previous example. Note that the same numbers are given to parts having the same functions as in the previous example, and explanations thereof will be omitted.

In short, in this embodiment, the rubber block 60 as a rubber elastic body has a thick cylindrical shape, and the mounting plate 4 having the mounting bolts 8 on one end thereof is fixed by integral vulcanization molding. Similarly, an annular support fitting 14 is fixed to the other end of the support fitting 60, and by caulking and fixing the support fitting 14 to the protective fitting 26, two hat members, that is, the outer hat member 62 and The peripheral edge (flange) of the partition means formed by overlapping the inner hat members 64 and the peripheral edge of the diaphragm 22 are fixed in a liquid-tight manner. and,
By means of the partition means consisting of these two hat members 62 and 64, an operating chamber 2 is formed within the rubber block 60.
0, and between the partition means and the diaphragm 22, an equilibrium chamber 24 is formed, as in the previous example. Note that a predetermined incompressible fluid is sealed in the working chamber 20 and the equilibrium chamber 24.

Further, the two hat members 62 and 64 which are overlapped to form the partition means have a slightly different shape from the previous example, and each has a bottomed cylindrical portion having a substantially truncated cone shape. Then, an annular space 42 similar to the previous example is formed between the cylinder wall portions close to the bottom (upper bottom) of the truncated cone-shaped bottomed cylindrical portions, in other words, between the shoulders. The annular space 42 is made to communicate with the working chamber 20 and the equilibrium chamber 24 through communication holes 46 and 48 similar to the above. Furthermore, a rubber movable plate 56 is also housed in a cavity formed between the bottoms of the two hat members 62 and 64, and is movable a predetermined distance, so that the pressure of the incompressible fluid in the working chamber 20 is reduced. It is adapted to act on the balance chamber 24 side.

In addition, in the above two embodiments, the movable plate 5
6 is accommodated in the outer hat member 16, 62.
A second bottom part 50 is provided at the bottom of the inner hat member 18, 64 so that a predetermined gap is formed between the second bottom part 50 and the bottom parts of the inner hat members 18, 64. , the bottoms of the inner hat members 18 and 64 are recessed inwardly, and the outer hat member 1
It is possible to form a movable plate accommodation cavity between the bottoms of the hat members 6 and 62, and furthermore, at the bottom of each of these hat members, a second bottom that projects outward and a recess that fits inward can be formed at the same time. There is no problem in providing a movable plate accommodation space.

Further, in the above example, an example in which the present invention is applied to an engine mount has been described, but the present invention can also be applied to other anti-vibration supports such as body mounts.

Furthermore, although not illustrated, various improvements, modifications, changes, etc. can be made to the present invention based on the knowledge of those skilled in the art without departing from the spirit of the present invention. It goes without saying that the present invention includes such embodiments.

Effects of the Invention As is clear from the above description, the present invention provides a partitioning means located between the working chamber and the equilibrium chamber formed in the fluid-filled mount by using a bottomed cylindrical portion made of a press-molded product. It is constructed by overlapping two hat members, and by overlapping, a space in which the movable plate is accommodated is formed between the bottom parts, and an annular space forming an orifice is formed between the cylinder walls. This greatly simplifies the structure of the partition means and makes the assembly work extremely easy.Furthermore, the flanges of such overlapped hat members can be formed at the same time. When attaching and supporting the partition, the thickness of the part is significantly thinner than that of conventional fluid-filled mounts, and therefore it was possible to effectively downsize the installation location of such partition means. .

In the present invention, since the hat member is manufactured by press working, it is extremely easy to manufacture, suitable for mass production, and can be manufactured at extremely low cost.

Further, in the present invention, since the through hole that communicates the orifice with the inside of the working chamber is provided through the bottom of the bottomed cylindrical portion of the outer hat member, the bottomed cylindrical portion of the outer hat member is The outer peripheral surface of the cylinder wall can be disposed in contact with the inner peripheral surface of the working chamber, so that the orifice is formed at the outermost peripheral part of the working chamber and extends as much as possible along the cylinder wall. Since the orifice can be arranged with a large diameter, the length of the orifice can be advantageously secured, and the vibration damping effect due to the fluid flowing inside the orifice can be advantageously secured.
It also has the advantage that it can be obtained more effectively.

[Brief explanation of drawings]

FIG. 1 is a cross-sectional view showing an example of an engine mount related to the vibration-proof support of the present invention, FIG. 2 is a plan view of an overlapping outer and inner hat member serving as partition means, and FIG. is an explanatory diagram of the communicating hole portion of the inner hat member in FIG. 2,
Figures 4 and 5 are - in Figure 2, respectively.
6 is an exploded perspective view of such a partition means, and FIG. 7 is a sectional view showing another example of an engine mount according to the present invention. 2, 60: Rubber block, 4: Mounting plate,
14: Support metal fittings, 16, 62: Outer hat member,
18, 64: Inner hat member, 20: Working chamber, 2
2: Diaphragm, 24: Equilibrium chamber, 26: Protective metal fittings, 28: Seal portion, 34, 36: Bottomed cylindrical portion,
38, 40: flange portion, 42: annular space, 4
4: blocking protrusion, 46, 48: communication hole, 50: second bottom, 52, 54: action hole, 56: movable plate.

Claims (1)

[Scope of Claims] 1. A rubber elastic body is provided on one side of the partition means to define an operating chamber into which vibrations are inputted, and at least one rubber elastic body is provided on the other side of the partition means. The enclosure is made of a flexible thin film to form an equilibrium chamber for absorbing changes in the internal pressure of the working chamber, and a predetermined incompressible fluid is sealed in the working chamber and the equilibrium chamber. A vibration isolating support having a structure in which a chamber and the equilibrium chamber are communicated through an orifice, and a movable plate supported by the partition means is movable a predetermined distance by the pressure applied to the fluid in the working chamber. , the partitioning means is formed by using an outer hat member and an inner hat member made of press-molded metal plates, each having a hat shape consisting of a shallow bottomed cylindrical part and a flange part, and connecting them to the former bottomed part. The bottomed cylindrical part of the outer hat member is overlapped so that the latter cylindrical part is accommodated in the cylindrical part, and the cylindrical wall of the bottomed cylindrical part of the outer hat member and the bottomed cylindrical part of the inner hat member are A gap is provided between the cylindrical wall of the outer hat member to form a circumferential annular space, and a through hole for communicating the annular space with the working chamber is provided at the peripheral edge of the bottom of the bottomed cylindrical portion of the outer hat member. To,
Furthermore, by providing through holes for communicating the annular space with the equilibrium chamber in the cylindrical walls of the bottomed cylindrical portions of the inner hat member, the orifice is formed, while the holes in the opposing outer hat member A space capable of accommodating the movable plate and moving it a predetermined distance is provided between the center portion of the bottom of the bottomed cylindrical portion and the center portion of the bottom of the bottomed cylindrical portion of the inner hat member; A hole communicating with the working chamber and the equilibrium chamber is provided in the two bottom portions forming a cavity, and the pressure of the incompressible fluid in the working chamber is increased through movement of a movable plate accommodated in the cavity. A vibration isolating support body, characterized in that it is made to act on the equilibrium chamber side. 2. Communication holes are provided in each of the outer hat member and the inner hat member so that the annular space is partially blocked in the circumferential direction, while communicating the annular space with the working chamber and the equilibrium chamber. A vibration-proof support according to claim 1. 3. The space in which the movable plate is accommodated is formed in a second bottom portion that is formed to protrude further outward in the center portion of the bottom of the bottomed cylindrical portion of the outer hat member and the bottomed cylindrical portion of the inner hat member. The vibration-proof support according to claim 1 or 2, which is formed between the center portion of the bottom of the vibration-proof support. 4. Claims 1 to 3, wherein the outer hat member and the inner hat member constituting the partitioning means are attached and supported by a caulking fixing structure at their overlapping flange portions. The anti-vibration support according to any one of the above.