JPH06272793A - Elastic coupling structure of exhaust tube - Google Patents

Abstract

PURPOSE:To provide an elastic coupling structure of an exhaust tube which can preferably prevents detachment of the exhaust tube attributed to the fracture or breakage of the elastic coupling. CONSTITUTION:An elastic coupling 10 where the cloth 14 using the ceramics fiber on the inner side of a cylindrical elastic layer 12 formed by the elastic material is cylindrically arranged is used, a cylindrical inner metal piece 16 is positioned on the inner side thereof, and a cylindrical outer metal piece 18 is positioned on the outside thereof, providing a laminated structure where the inner metal piece 16, the elastic coupling 10, and the outer metal piece 18 are integrated. In addition, a bent or curved part 28 which is recessed radially or outward as a whole is formed at the intermediate part in the axial direction of the laminated parts of the inner metal piece 16, the elastic coupling 10 and the outer metal piece 18, and the inner metal piece 16 and the outer metal piece 18 are individually fixed to the corresponding end parts of two exhaust tubes 24, 26 to be connected, and the exhaust tubes 24, 26 are elastically connected.

Description

Detailed Description of the Invention

[0001]

TECHNICAL FIELD The present invention relates to an elastic joint structure for an exhaust pipe,
In particular, the present invention relates to an elastic joint structure for an exhaust pipe that can be advantageously prevented from falling off due to breakage of an elastic joint used.

[0002]

BACKGROUND ART In an exhaust pipe for discharging combustion exhaust gas from an internal combustion engine to the outside, an exhaust pipe of, for example, a vehicle has a long length in order to guide such combustion exhaust gas from the engine room to the rear of the vehicle. And is connected by being connected to the internal combustion engine at the front part thereof, while being suspended and supported by the vehicle at the middle and rear parts thereof.

Since such an exhaust pipe is long, if it has an integral rigid structure, a large stress is generated at its front end due to stress concentration due to vibration and shaking of the exhaust pipe. However, there is a problem that the mechanical strength (durability) of the exhaust pipe decreases, and the vibration mass increases,
This causes problems such as an increase in vibration transmitted to the vehicle body and deterioration in riding comfort.

For this reason, conventionally, in such an exhaust pipe, while having a plurality of divided structures in its longitudinal direction, a predetermined elastic joint is used to elastically connect them to each other, which results in vibration mass and stress. The structure is designed to reduce concentration.

By the way, in the exhaust pipe having such a structure, the vibration and sway of the exhaust pipe should be reduced as much as possible.
In order to improve the vibration damping characteristics of the vehicle and the durability of the exhaust pipe itself, it is desirable that the joint portion exhibits excellent flexibility and elasticity in the axial direction.

Therefore, in order to realize a joint structure satisfying such required characteristics, JP-A-4-342820 proposes a flexible joint for a vehicle exhaust pipe. This is an inner layer formed of a stretchable cloth using ceramic fibers, and an intermediate layer formed of a heat-resistant heat insulating material that blocks heat conduction from the exhaust pipe side as much as possible,
It has a three-layer structure including an outer layer made of an elastic material such as rubber having a high flexibility. Therefore, by using a flexible joint having such a structure, an exhaust pipe joint structure having both excellent flexibility and stretchability can be advantageously realized.

However, in the conventional joint structure using such a flexible joint, the stretchability in the axial direction of the conventional joint structure causes the fabric and elastic layer constituting the flexible joint to move in the axial direction. It depends on the extensibility, and this flexible joint is fixed to the two exhaust pipes to be connected at both axial ends by tightening and fixing with a tightening belt. Therefore, when a crack is caused in such a flexible joint due to fatigue due to sudden input vibration in the axial direction or repeated deformation, such a crack occurs in the direction perpendicular to the axis of the flexible joint, As a result, there is a risk that the flexible joint may be divided by the cracks and the exhaust pipe may fall off.

[0008]

The present invention has been made in view of the above circumstances, and a problem to be solved by the present invention is due to breakage or division of an elastic joint used in a joint portion. Another object of the present invention is to provide an elastic joint structure for an exhaust pipe that can prevent the exhaust pipe from falling off.

[0009]

In order to solve such a problem, the present invention is configured by arranging a cloth using ceramic fibers in a tubular shape inside a tubular elastic layer formed of an elastic material. In a joint structure in which two exhaust pipes are elastically connected using an elastic joint, a tubular inner metal fitting is located inside the elastic joint, while a tubular outer metal fitting is located outside the tubular inner metal fitting. , The inner metal fittings, the elastic joints, and the outer metal fittings are configured to have an integrated laminated structure.Furthermore, the inner metal fittings, the elastic joints, and the outer metal fittings are generally radially inward or outer in the axial middle portion of the laminated parts. The inner metal fitting and the outer metal fitting are separately fixed to the corresponding end portions of the exhaust pipes to be connected to each other so that the exhaust pipes can be connected. Was a thing, it is an its features.

[0010]

In other words, in the elastic joint structure for the exhaust pipe according to the present invention, a tubular elastic joint having a double structure of an elastic layer made of an elastic material and a ceramic fiber cloth is provided. , The tubular inner metal fittings and the outer metal fittings are arranged with an integrated laminated structure, while the inner metal fittings and the outer metal fittings are separately fixed to the two exhaust pipes, and the two exhaust pipes are Since they are elastically connected, expansion and contraction action in the axial direction of the joint portion is caused by axial shearing deformation of the elastic layer of the elastic joint, which results in axial movement of both exhaust pipes. When a crack is generated in the elastic layer of the elastic joint due to, the crack is generated in the axial direction of the elastic layer.

In such an elastic joint structure,
In particular, since a curved or bent portion that is recessed inward or outward in the radial direction is formed as a whole in the axial middle portion of the laminated portion of the inner metal fitting, the outer metal fitting, and the elastic joint, the elasticity as described above is formed. Even if a crack in the layer is generated along such a bending or bending portion, thereby causing the elastic layer to break, and the elastic joint may be bisected in the radial direction, The bisected elastic joint is divided into two sections (cracks) in each elastic layer.
The curved or bent portions of the two are engaged with each other, and their axial withdrawal can be effectively prevented. In addition, such an action of preventing the slip-out is more effectively achieved by configuring the curved portion or the bent portion so that one of the inner metal fitting and the outer metal fitting can be inserted into the other recessed material. It can be realized.

Therefore, in the elastic joint structure having such a structure, the elastic joint may be broken or divided by cracks due to abrupt input vibration in the axial direction or fatigue cracks due to repeated deformation. In that case, the exhaust pipe can be effectively prevented from falling off.

[0013]

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

First, FIG. 1 is a schematic view for specifically explaining an example of an elastic joint structure for a vehicle exhaust pipe according to the present invention. In this figure, 10 is an elastic joint, which has a substantially thick-walled cylindrical shape as a whole, and its cylindrical wall portion is composed of a cylindrical elastic layer 12 forming an outer layer and a cloth 14 positioned inside thereof. It has a double structure. Further, an inner metal fitting 16 is provided on the radially inner side of the elastic joint 10, and an outer metal fitting 18 is further provided on the radially outer side.
However, they are respectively positioned to form an integral structure. The inner metal fitting 16 and the outer metal fitting 18 are fixed to the exhaust pipes 24 and 26 via the inner mounting metal fitting 20 and the outer mounting metal fitting 22, respectively, whereby the two exhaust pipes 24 and 26 are fixed. Are elastically connected.

Here, the elastic layer 12 constituting the elastic joint 10 is formed by a rubber sleeve having a substantially cylindrical shape. The material of the rubber sleeve that constitutes the elastic layer 12 is not particularly limited, but it may be exposed to a considerably high temperature due to heat conduction from the exhaust pipe side, and thus has a certain degree of heat resistance. It is desirable to use a rubber material having Specifically, silicone rubber, fluororubber, or the like is preferably adopted as the rubber material. The thickness of the elastic layer 12 is also
It is not limited in any way, and can be appropriately set according to the size of the elastic joint 10 in consideration of durability and the like.

Inside the elastic layer 12, a cloth 14 having a substantially cylindrical shape is arranged.
However, it is formed using ceramic fibers. As the ceramic fiber that provides the cloth 14, various fibers such as a polycrystalline fiber, a glass fiber, and a composite fiber can be adopted, but their heat resistance and easiness of handling are points. From Al ₂ O ₃ —SiO ₂ —B ₂
O ₃ -based or SiC-based ceramic fibers can be used particularly advantageously. Note that some glass-based ceramic fibers have a relatively low softening point. Therefore, when using glass-based ceramic fibers, consider the temperature at the joint portion of the exhaust pipe, etc. It is necessary to select the material.

The fabric 14 is formed into a form such as a woven fabric, a knitted fabric, or a non-woven fabric by weaving, knitting, or collective compression of the above-described ceramic fiber threads. The elastic layer 12 having such a shape is formed into a cylindrical shape having an axial length substantially the same as or longer than that of the elastic layer 12, whereby the inner peripheral surface of the elastic layer 12 is formed. , Cloth 14
Therefore, heat conduction from the exhaust pipes 24, 26 side to the elastic layer 12 is advantageously relaxed.

In order to obtain such a cylindrical cloth 14, generally, as described above, a flat cloth is formed by using the yarn of the ceramic fiber, and this is made into a cylindrical shape. A method of forming a cylindrical shape by stitching the both ends of the polymerized portion together, adhering them, or integrally joining them to the inner peripheral surface of the cylindrical elastic layer 12 is adopted. In addition, of course, a method of directly forming a cylindrical fabric by using the above-described ceramic fiber thread can also be adopted.

The thickness of the cloth 14 is determined by the location of the elastic joint 10 with respect to the exhaust pipe, that is, the temperature to which the cloth 14 is exposed, the heat resistance of the ceramic fibers used,
Further, in consideration of the material of the elastic layer 12, the elastic layer 1
The thickness is set to a value capable of exhibiting sufficient heat insulating property so that the exhaust gas is not affected by the heat of the exhaust gas. In addition, for the same reason, it is preferable that the cloth 14 has a close gap between fibers.

On the other hand, the elastic joint 1 having the structure as described above
Inner metal fittings 16 are arranged on the inside of 0, that is, on the inside of the cloth 14. This inner metal fitting 16 is a cloth 1
4, an axial length capable of covering substantially the entire inner peripheral surface, and the cloth 1
4 has an outer diameter substantially the same as the inner diameter of 4, and is formed in a substantially cylindrical shape. As a result, the inner metal fitting 16 is positioned inside the elastic joint 10 while the outer peripheral surface is in close contact with the inner peripheral surface of the fabric 14.

An outer metal fitting 18 is arranged outside the elastic joint 10, that is, outside the elastic layer 12.
The outer metal fitting 18 also has a substantially cylindrical shape as a whole, and has an axial length capable of covering substantially the entire outer peripheral surface of the elastic layer 12 and an inner diameter substantially equal to the outer diameter of the elastic layer 12. Has been done. Thus, the outer metal fitting 18
The inner peripheral surface of the elastic layer 12 is brought into close contact with the outer peripheral surface of the elastic layer 12, and is positioned outside the elastic joint 10.

Then, the elastic joint 10 becomes the inner metal fitting 1.
6 between the outer metal fitting 18 and the outer metal fitting 18
6 and 18 are closely fixed and positioned, so that they are integrated with a laminated structure in which the outer metal fitting 18, the elastic joint 10, and the inner metal fitting 16 are arranged in this order from the outer side to the inner side in the radial direction. It is configured in a physical way.

Here, a constricted portion 28 is formed over the entire circumference at a substantially central portion in the axial direction of the laminated portion of the outer metal fitting 18, the elastic joint 10 and the inner metal fitting 16.
The constricted portion 28 is formed with an inner diameter that is at least a predetermined dimension larger than the outer diameters of the exhaust pipes 24 and 26 in a state where the axially substantially central portion of the stacking portion is reduced in diameter by a predetermined dimension. The cross-sectional shape is configured to have a substantially dish shape. And here, the outer metal fitting 1
The inner diameter of the outer metal fitting 18 in the constricted portion 28 is larger than the outer diameter of both axial end portions of the inner metal fitting 16 (portions outside the constricted portion 28 in the axial direction) so that the recessed portion 8 of the inner metal fitting 16 enters the concave portion of the inner metal fitting 16. It is slightly smaller.
Therefore, as is apparent from this, in the present embodiment, the constricted portion 28 causes the inner metal member, the outer metal member, and the elastic joint to be axially intermediately or radially outwardly of the laminated portion of the inner metal member, the outer metal member, and the elastic joint. A curved or bent portion that is recessed in is formed.

The inner fittings 20 are arranged inside the inner fittings 16 and the outer fittings 22 are arranged outside the outer fittings 18, and the inner peripheral surfaces of the inner fittings 16 and the outer fittings 18 are arranged. And for the outer peripheral surface,
Each is joined and fixed integrally.

As shown in FIG. 2, the inner mounting member 20 has a substantially cylindrical shape as a whole, and one axial end thereof extends continuously in the circumferential direction. While the outward flange portion 30 is provided, a convex portion 32 that protrudes outward in the radial direction by a predetermined height with a predetermined width is formed over the entire circumference in a substantially central portion in the axial direction. Further, as is apparent from FIG. 1, the inner fitting 20 has an inner diameter substantially the same as the outer diameter of the exhaust pipes 24, 26. In the inner mounting member 20, the inner mounting member 16 is positioned inside the inner mounting member 16, and only the end surface of the outward flange portion 30 and the outer peripheral surface of the convex portion 32 are located on one end of the inner mounting member 16 in the axial direction. The inner peripheral surface of the inner metal member 16 and the inner peripheral surface of the axially intermediate portion of the inner metal member 16 forming the bottom portion of the constricted portion 28, respectively.
The contact portions are fixed by spot welding or the like. Thus, the inner mounting bracket 2
0 is partially brought into contact with the inner metal fitting 16 and integrally joined with a small contact area.

On the other hand, as shown in FIG. 3, the outer mounting member 22 has a substantially stepped cylindrical shape as a whole, and has a substantially cylindrical small diameter portion 34 and a shaft longer than the small diameter portion 34. A substantially cylindrical large-diameter portion 36 having a directional length and a large diameter by a predetermined dimension and arranged to face each other in the axial direction, and an annular connecting portion 38 connecting the small-diameter portion 34 and the large-diameter portion 36.
It consists of and. In addition, the outer mounting bracket 22
In that case, as is apparent from FIG. 1, the small diameter portion 36 has an inner diameter substantially the same as the outer diameter of the exhaust pipes 24, 26, and
The large-diameter portion 34 is formed with an axial length longer than the outer fitting 18 of the elastic joint 10 by a predetermined dimension and an inner diameter substantially equal to the outer diameter of the outer fitting 18. The large-diameter portion 36 of the outer mounting member 22 is externally arranged on the outer metal member 18 so as to cover the constricted portion 28 over the entire circumference, and further, the end portion of the large-diameter portion 36. At, the outer metal fitting 18 is caulked and fixed. As a result, the outer mounting member 22 is brought into contact with the outer member 18 only at the inner peripheral surfaces of both ends in the axial direction, and is integrally assembled.

Further, in the outer mounting member 22, the outer peripheral portion of the connecting portion 38 is extended outward from the end of the inner metal member 16 on the one axial side by a predetermined dimension in the elastic joint 10. Is abutted against the end surface of the inner metal fitting 16 and the inner peripheral portion of the inner metal fitting 16 is axially separated from the end surface of the inner metal fitting 16 on one side in the axial direction and the outward flange 30 of the inner mounting metal fitting 20 by a predetermined distance. Are arranged opposite each other. That is, accordingly, the end faces of the inner metal fittings 16 on the one axial side and the outward flange portions 30 of the inner mounting metal fittings 20,
A gap having a predetermined width is provided between the outer mounting member 22 and the connecting portion 38, so that the outer mounting member 22 and the inner mounting member 16 and the inner mounting member 20 are effectively allowed to move in directions close to each other. It is about to be done.

By the way, the elastic joint structure of the exhaust pipe according to this embodiment is realized as follows, for example.

That is, first, a cold-rolled steel pipe, a carbon steel pipe, or the like having the same diameter as the member to be obtained is subjected to predetermined plastic deformation processing, etc. The inner metal fitting 16 and the outer metal fitting 18 which are provided with a predetermined bent portion which is recessed inward in the direction, and FIGS.
The inner mounting member 20 and the outer mounting member 22 having the shape shown in FIG. Then, the inner fitting 20 is attached to the inner peripheral surface of the inner fitting 16 thus obtained.
After being integrally joined as described above, a predetermined adhesive is applied to substantially the entire outer peripheral surface thereof. Subsequently, they are placed in a predetermined mold and the inner metal fitting 16
On the outer side of, the separately manufactured cloth 14 is inserted and arranged on the outer peripheral surface of the inner metal fitting 16, and the outer metal fitting 18 is arranged in the mold. Then, a rubber material is injected into the mold and vulcanization molding is performed. Thereby, while forming the elastic layer 12, the outer metal fitting 18 is vulcanized and adhered, and the adhesive applied to the inner peripheral surface of the inner metal fitting 16 serves to separate the inner metal fitting 16 and the rubber material leaked from the cloth 14. Glue it. Thus, the elastic joint 10 including the elastic layer 12 and the cloth 14 is formed, and at the same time, an integrally vulcanized molded product as shown in FIG. 4 is obtained.

After that, the outer metal fitting 18 of the integrally vulcanized molded product thus obtained is subjected to a drawing process to make the joint surface between the inner metal fitting 16, the outer metal fitting 18 and the elastic joint 10 stronger. The joint strength is improved.
Finally, as shown in FIG. 1, the outer mounting member 22 is inserted and arranged outside the outer mounting member 18, and the outer mounting member 22 is attached to the outer mounting member 18 as described above.
By caulking and fixing, the desired integral joint assembly is obtained.

As is apparent from FIG. 1, such a joint assembly has the two exhaust pipes 24, 26 to be connected to each other at the openings at both ends of the inner fitting 20 and the outer fitting 22. After being externally fitted to the respective open end portions of the above, the exhaust pipes 24 and 26 are fixed to the respective exhaust pipes 24 and 26 by welding or the like.
In the communicating state, they are connected to each other with good flexibility and stretchability.

As described above, in the elastic joint structure for the exhaust pipe according to this embodiment, the elastic layer 12 made of the rubber sleeve is used.
The elastic joint 10 constituted by the cloth 14 made of ceramic fiber and the cloth 14 made of ceramic fiber is integrally laminated between the inner metal fitting 16 and the outer metal fitting 18, while the inner metal fitting 16 and the outer metal fitting 18 are exhaust pipes. 24 and 26 are fixed integrally and separately to both exhaust pipes 24 and 2
Since 6 is elastically connected, the elastic joint 10 effectively responds to the axial movement of the exhaust pipes 24 and 26 by the shear deformation of the elastic layer 12. Therefore, even if a crack is generated due to sudden input vibration in the axial direction or excessive fatigue due to repeated deformation, such a crack is generated.
It occurs in the axial direction of 0.

And, in such an elastic joint structure,
The inner metal fitting 16, the outer metal fitting 18, and the elastic joint 10
Since the constricted portion 28 is formed in the axially intermediate portion of the laminated portion of the above, the crack of the elastic layer 12 as described above is generated with the constricted portion corresponding to the constricted portion 28, thereby Even if the elastic layer 12 is broken and the elastic joint 10 is bisected in the radial direction, the bisected elastic joints 10 are engaged with each other at the constriction of the respective dividing planes (cracks). As a result, it is possible to effectively prevent the axial exhaustion of the exhaust pipes 24 and 26, and to effectively prevent the exhaust pipes 24 and 26 from falling off.

Moreover, in such an elastic joint structure,
The constricted portion 28 is formed by drawing the outer metal fitting 18.
Since the inner diameter of the outer metal fitting 18 at is slightly smaller than the outer diameter of both axial end portions of the inner metal fitting 16 (portions outside the constricted portion 28 in the axial direction), it is caused by the axial pulling force. Even if the elastic layer 12 may be disengaged due to the compressive deformation of the sectional surface or the like due to the constriction of the sectional surface, the metal fittings 16 and 18 are engaged with each other, and The elastic joint 10 can be completely prevented from coming out in the axial direction, so that the elastic joint 10 comes out in the axial direction, and by extension, the exhaust pipe 2.
The fail-safe function against the loss of 4,26 is advantageously exhibited.

Further, in the elastic joint structure according to this embodiment, the inner metal fitting 16 and the outer metal fitting 18 are partially brought into contact with the both metal fittings 16 and 18 and joined to each other. Since it is fixed to both exhaust pipes 24, 26 via the outer mounting metal fitting 22 and the outer mounting metal fitting 22, respectively, the inner metal fitting 16 is
Further, the heat conduction to the outer metal fitting 18 and by extension to the elastic joint 10 by the exhaust gas can be advantageously alleviated, so that the adverse effect of heat on the elastic joint 10 is effectively reduced or eliminated.

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

For example, in the above embodiment, the outer metal fitting 18
And a constricted portion 28 which is formed in a state in which a substantially central portion in the axial direction of a laminated portion of the elastic joint 10 and the inner metal fitting 16 is reduced in diameter by a predetermined dimension, and has a substantially dish-shaped cross section. Although a predetermined bending or bending portion was formed, it does not matter if the bending or bending portion is provided so as to be recessed radially outward, and in any case, such a laminated portion In the axial middle part of
It may have any shape as long as it is recessed inward or outward in the radial direction as a whole, and as the shape, specifically, a cross-section has an arc shape or a cup shape, Alternatively, it may have a V-shape, and even if the laminated portions are expanded in diameter by a predetermined dimension, they may be formed in any shape. Further, in the case where a curved portion or a bent portion that is recessed radially outward as a whole is provided in the axially intermediate portion of the stacking portion, the recessed portion of the inner metal fitting enters the recessed portion of the outer metal fitting. As described above, it is desirable to configure the outer diameter of the recessed portion of the inner metal fitting to be larger than the outer diameter of both ends in the axial direction of the outer metal fitting by a predetermined dimension, thereby preventing the elastic joint from coming off and eventually preventing the exhaust pipe from falling off. Needless to say, can be played more effectively.

Although the elastic layer 12 is made of a rubber sleeve in the above embodiment, the elastic layer 12 may be made of a sleeve made of other polymer material having elasticity. .

Further, in the above embodiment, the elastic joint 10 is used.
Has a double structure composed of a laminated structure of the elastic layer 12 and the cloth 14, but a heat insulating layer made of a heat insulating material having heat resistance may be further provided between the elastic layer 12 and the cloth 14. Good, thereby, the heat resistance of the elastic joint can be improved, and the elastic joint structure of the exhaust pipe having more excellent heat resistance characteristics can be realized.

Furthermore, in the above embodiment, the inner metal fitting 1
6 and the outer metal fitting 18 through the inner mounting metal fitting 20 and the outer mounting metal fitting 22 which are separately formed, both exhaust pipes 24, 2
It was fixed to 6 respectively, but each of them,
It is also possible to integrally configure and fix the inner metal fitting and the outer metal fitting directly to the exhaust pipe, in which case a predetermined heat insulating layer or the like is provided between the outer metal fitting 18 and the elastic layer 12 of the elastic joint 10. By forming, the effect of heat on the elastic layer 12 can be effectively alleviated. As is apparent from this, the inner mounting member 20 and the outer mounting member 22 are not essential in the present invention.

In addition, in the above embodiment, a specific example of the present invention applied to an elastic joint structure of an exhaust pipe for a vehicle is shown, but in addition to the exhaust pipe in various devices other than the vehicle, Of course, the same can be applied.

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

[Brief description of drawings]

FIG. 1 is a half cross sectional view schematically showing an example of an elastic joint structure for an exhaust pipe according to the present invention.

FIG. 2 is a half cross-sectional view showing an inner mounting member used in the elastic joint structure for the exhaust pipe shown in FIG.

FIG. 3 is a half cross-sectional view showing an outer mounting member used in the elastic joint structure for the exhaust pipe shown in FIG.

FIG. 4 is a half cross-sectional explanatory view showing an integrally vulcanization molded product used in the elastic joint structure of the exhaust pipe shown in FIG. 1.

[Explanation of symbols]

 10 elastic joint 12 elastic layer 14 cloth 16 inner metal fitting 18 outer metal fitting 20 inner mounting metal fitting 22 outer mounting metal fitting 24, 26 exhaust pipe 28 constricted part

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Masaaki Hamada 3600 Amitsu, Kojitoyama, Komaki City, Aichi Prefecture Tokai Rubber Industry Co., Ltd.

Claims (1)

[Claims] 1. An elastic joint formed by arranging a cloth made of ceramic fibers in a tubular shape inside a tubular elastic layer made of an elastic material to elastically connect two exhaust pipes. The inner joint of the elastic joint is located inside the tubular inner fitting, while the outer tubular fitting is located outside the inner fitting, and the inner fitting, the elastic joint and the outer fitting are connected to each other. The inner metal fitting, the elastic joint, and the outer metal fitting are formed with an integral laminated structure, and a curved or bent portion that is recessed radially inward or outward is formed in the axial middle portion of the laminated portion of the inner metal fitting, the elastic joint, and the outer metal fitting. At the same time, the elastic fitting structure of the exhaust pipe is characterized in that the inner fitting and the outer fitting are separately fixed to corresponding ends of the exhaust pipe to be connected, and the exhaust pipe is connected.