JP2588706Y2 - Spherical exhaust pipe fitting - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a spherical exhaust pipe joint for connecting an exhaust pipe of an automobile, and more particularly, to a spherical exhaust pipe joint capable of allowing relative angular displacement and relative axial displacement occurring in the exhaust pipe. It is.

[0002]

2. Description of the Related Art Exhaust gas from an automobile engine is guided to an exhaust pipe arranged in a vehicle body and released into the atmosphere. This exhaust pipe is subjected to repeated bending stress due to torque reaction and inertia of the engine. . In particular, in the case of a front-wheel-drive horizontal engine, the bending stress is considerably larger than in the case of a vertical engine.

[0003] Therefore, there is a danger that not only the vibration of the engine is transmitted to the passenger compartment through the exhaust pipe suspension device, but also causes noise and also causes a problem such as fatigue breakage of the exhaust pipe.

[0004] In order to solve such a problem, generally, measures such as arranging a spherical pipe joint at a required portion of the exhaust pipe to absorb the stress are taken.

Here, an example of such a spherical exhaust pipe joint will be described with reference to the drawings.

As shown in FIG. 5, an upstream exhaust pipe (engine side) 1 and a downstream exhaust pipe (muffler side) 2 are coaxial with each other so as to be opposed to each other with a small gap S at the pipe end. They are arranged on a line. A spherical band-shaped seal body 3 having a convex spherical portion 3a on the outer surface is fitted and seated on the outer peripheral surface of the pipe end portion of the upstream side exhaust pipe 1 in a central circular hole 3b provided in the axial direction of the seal body 3. At the same time, the maximum diameter side end surface portion 3c of the seal body 3 is in contact with the flange 4 fixed to the outer peripheral surface of the upstream side exhaust pipe 1 in a direction perpendicular to the axis thereof.

[0007] A concave spherical portion 2a corresponding to the outer convex spherical portion 3a of the seal body 3 is formed at the pipe end of the downstream exhaust pipe 2, and the downstream exhaust pipe 2 has a concave spherical portion 2a. It is arranged in sliding contact with the outer convex spherical surface portion 3 a of the seal body 3. One end of the upper and lower exhaust pipes 1 and 2 is screwed and fixed to a flange 4 fixed to the upstream exhaust pipe 1, and the other end is an insertion hole of a flange 5 fixed to the downstream exhaust pipe 2. A pair of headed bolts 6 arranged through the pair 5a and a pair of coil springs 7 constantly biased in the direction of the upstream exhaust pipe 1 between the heads of the bolts 6 and the flange 5. ing.

As described above, by the action of the coil spring 7, the outer convex spherical portion 3a of the seal body 3 and the concave spherical portion 2a formed at the pipe end of the downstream side exhaust pipe 2 are under pressure. It is configured so as to be mutually slidable so as to be angularly displaceable while maintaining the sealing function.

[0009]

However, the conventional spherical pipe joint having the above-described structure has an advantage that the relative angular displacement generated between the upstream and downstream exhaust pipes 1 and 2 can be tolerated, but the automobile has the advantage. If a relative axial displacement (vibration) occurs between the exhaust pipes 1 and 2 when the engine is idling or the automobile is running, the vibration cannot be absorbed, and the vibration cannot be absorbed by the other exhaust pipe, vehicle body, or the like. There are problems such as being transmitted to a muffler or the like and being brought into the vehicle interior, or causing noise.

The present invention has been made to solve the above-mentioned problems, and effectively utilizes the advantage that the relative angular displacement generated between the upper and lower exhaust pipes in the prior art can be tolerated. It is an object of the present invention to obtain a spherical exhaust pipe joint that can tolerate a relative axial displacement (vibration) when the displacement occurs.

[0011]

According to the present invention, an object of the present invention is to connect an upstream exhaust pipe connected to an engine side of a motor vehicle and a downstream exhaust pipe connected to a muffler side, and to provide both exhaust pipes. A spherical exhaust pipe joint that allows relative angular displacement and relative axial displacement occurring between the upstream exhaust pipe, wherein a flange is integrally fixed to the outer peripheral surface of the upstream exhaust pipe, A spherical band-shaped seal body having an inner surface defining a through hole, having a convex spherical surface portion on the outer surface, and having an end surface portion on the maximum diameter side of the convex spherical portion is mounted with the end surface portion facing the flange side. Between the end surface of the seal body and the flange, a vibration absorbing portion formed of a cylindrical mesh having an inner surface defining a through hole, an inner surface of the mesh and an end surface of the mesh connected to the inner surface. And an outer peripheral surface of the net and a net connected to the outer peripheral surface A compression ring having a sealing portion made of a refractory material integrally filled and coated on at least one of the end surfaces is disposed with its end surfaces being in close contact with the flange and the end surface of the seal body. That
The downstream-side exhaust pipe has a concave spherical part corresponding to the outer convex spherical part of the seal body, and the downstream exhaust pipe slides the concave spherical part on the convex spherical part of the seal body. Being disposed, and the upstream exhaust pipe and the downstream exhaust pipe are always located between the concave spherical part of the downstream exhaust pipe and the convex spherical part of the spherical band-shaped seal body attached to the upstream exhaust pipe. The present invention is achieved by a spherical exhaust pipe joint having the above-mentioned configuration, which is connected by a spring means for performing a close sliding contact by a spring force.

In the above-described configuration, a flange is integrally formed with the periphery of the opening of the concave spherical portion of the downstream exhaust pipe, and one end of the spring means is fixed to the flange, and the other end is inserted through the flange. And a pair of coil springs disposed between the bolt head and the flange portion.

The spring means includes a spring receiving member fixed to the flange portion, and a coil spring having one end abutting the spring receiving member and the other end abutting against a flange fixed to the upstream exhaust pipe. I have it.

[0014] In one example, the spherical belt-shaped seal is fitted and seated on the upstream exhaust pipe. In the case where a vibration absorbing cylinder made of a mesh is attached to the outer peripheral surface of the upstream exhaust pipe, the spherical belt-shaped seal and the compression ring are attached to the upstream exhaust pipe via the vibration absorbing cylinder. It has been impatient.
The vibration absorbing cylinder and the vibration absorbing portion of the compression ring may be separate bodies, but may be formed integrally from the same net-like body instead.

[0015]

The operation of the spherical exhaust pipe joint of the present invention having the above-described structure is as follows. The relative angular displacement generated between the upper and downstream exhaust pipes is allowed while maintaining the sealing function between the outer convex spherical surface portion of the spherical belt-shaped seal body and the concave spherical surface portion of the downstream exhaust pipe. You.

When a relative axial displacement occurs between the upper and lower exhaust pipes, the displacement is caused between the flange and the end face of the spherical belt-like seal mounted on the outer peripheral surface of the upstream exhaust pipe. The arrangement is permitted by the compression ring being deformed by compression restoration in the tube axis direction.

Exhaust gas from a sliding gap between the inner surface of the spherical belt-shaped seal body and the outer peripheral surface of the exhaust pipe on which the seal body is mounted is sealed by a sealing portion made of a refractory material filled and covered in the compression ring, Leakage of exhaust gas from the site is prevented.

[0018]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, the present invention will be described in detail with reference to the accompanying drawings showing embodiments thereof. FIG. 1 is a longitudinal sectional view showing an embodiment of the spherical exhaust pipe joint of the present invention.

In the figure, an upstream exhaust pipe (engine side)
10 has a flange 20 leaving a pipe end 11 on its outer peripheral surface.
Are provided integrally.

A spherical surface having an inner surface 31 defining a through hole on the outer peripheral surface of the tube end portion 11, a convex spherical portion 32 on the outer surface, and an end surface portion 33 on the largest diameter side of the convex spherical portion 32. The band-shaped seal body 30 is fitted and seated with the end face portion 33 facing the flange 20 side.

As the spherical band-shaped seal body 30, for example, a structure in which a refractory material made of expanded graphite and / or mica disclosed in Japanese Patent Application Laid-Open No. 54-76759, which is reinforced with a wire mesh, is preferably used. is there.

The end face 33 of the seal body 30 and the flange 2
0, a vibration absorbing portion 42 composed of a cylindrical mesh having an inner surface 41 defining a through hole, and an outer peripheral surface of the mesh and a refractory material filled and coated on both end surfaces of the mesh connected to the outer peripheral surface. A compression ring 40 having a sealing portion 43 made of a material is disposed such that its end face is in close contact with the end face portion 33 of the sealing body 30 and the flange 20.

The compression ring 40 is formed by winding a metal wire mesh obtained by weaving or knitting a thin metal wire, for example, a stainless steel wire or a galvanized iron wire, into a cylindrical shape, and then forming the cylindrical body. A refractory material is arranged on the outer peripheral surface of the cylinder and both end surfaces of the cylindrical body connected to the outer peripheral surface, and is compressed in the axial direction, so that the vibration absorbing portion 42 made of the mesh and the refractory material Is formed to form a sealing portion 43 filled and covered, and the compression ring 40 is given elasticity and restoring force in the compression direction by the vibration absorbing portion 42 made of the mesh.

As the refractory material which is filled and coated on the outer peripheral surface of the mesh body and both end faces of the mesh body connected to the outer peripheral surface to form the sealing portion 43, those having heat resistance and excellent moldability are used. For example, expanded graphite sheets, mica sheets and the like are preferably used.

The downstream exhaust pipe 50 (muffler side) has a concave spherical portion 51 corresponding to the outer convex spherical portion 32 of the seal body 30 at the end of the pipe, and an exhaust gas on the maximum diameter side peripheral edge of the concave spherical portion 51. An annular flange portion 52 extending outward in a direction perpendicular to the axis of the pipe is integrally formed.
Are provided with insertion holes 53 at opposing positions.

The downstream exhaust pipe 50 has a concave spherical portion 51 formed at the end of the pipe, and an outer convex spherical surface of the spherical band-shaped sealing body 30 inserted into the pipe end 11 of the upstream exhaust pipe 10. It is arranged in sliding contact with the part 32.

The insertion hole 5 provided in the flange portion 52
A pair of head bolts 60 screwed and fixed to the flange 20 of the upstream exhaust pipe 10, one end of which is opposed to the flange portion 52, is disposed in each of the bolts 3 and 53.

Between the heads of the head bolts 60, 60 and the flange 52, there is provided a pair of coil springs 70 for generating a spring force so as to always press the seal body 30 toward the downstream exhaust pipe 50. The bolts 60 are arranged so as to be fitted on the outer peripheral surfaces thereof.

In the thus constructed spherical exhaust pipe joint, when a relative angular displacement occurs between the upstream and downstream exhaust pipes 10, 50, the spherical exhaust pipe joint is fitted to the outer peripheral surface of the pipe end of the upstream exhaust pipe 10. Outer convex spherical surface portion 3 of seated spherical belt-shaped seal body 30
2 and a concave spherical portion 5 formed at the pipe end of the downstream side exhaust pipe 50
The angular displacement is allowed by the sliding contact with 1.

When a relative axial displacement occurs between the upstream and downstream exhaust pipes 10 and 50, the flange 20 fixed to the outer peripheral surface of the pipe end of the upstream exhaust pipe 10 and the pipe end By compressing and restoring the compression ring 40 in the axial direction between the compression ring 40 and the maximum diameter side end surface portion 33 of the spherical band-shaped seal body 30 fitted and seated on the outer peripheral surface, the two exhaust pipes 1 are formed.
A relative axial displacement between 0 and 50 is allowed.

Even when a relative angular displacement or axial displacement occurs, the outer convex spherical portion 32 of the spherical belt-shaped seal body 30 and the concave spherical portion 51 of the downstream exhaust pipe 50 are in close sliding contact with each other. There is no leakage of exhaust gas.

Also, the inner surface 31 of the spherical band-shaped seal body 30 and the upstream exhaust pipe 10 on which the seal body 30 is fitted and seated.
The leakage of the exhaust gas from the sliding gap between the outer peripheral surface of the pipe end and the outer peripheral surface of the tube is prevented by the sealing portion 43 of the compression ring 40 disposed between the end surface portion 33 of the seal body 30 and the flange 20. .

FIG. 2 shows a spherical exhaust pipe joint using another compression ring 40 in the spherical exhaust pipe joint according to the above-described embodiment.

That is, the flange 20 is fixed between the outer peripheral surface of the pipe end of the upstream exhaust pipe 10 and the end surface 33 of the spherical band-shaped seal body 30 fitted and seated on the outer peripheral surface of the pipe end. The compressed ring 40 is provided with an inner surface 4 defining a through hole.
1, a vibration absorbing portion 42 made of a cylindrical net-like body having an inner surface 41 and a sealing portion 43 made of a refractory material and filled at both end surfaces of the net-like body connected to the inner surface 41. Even when the compression ring 40 is used, the same operation as in the above-described embodiment is performed.

FIG. 3 shows a spherical exhaust pipe joint using other spring means in the spherical exhaust pipe joint shown in FIG.

That is, a substantially cylindrical portion 81 and one opening of the cylindrical portion 81 are formed in an annular flange portion 52 formed on the maximum diameter side peripheral edge of the concave spherical portion 51 formed at the pipe end of the downstream side exhaust pipe 50. A flange portion 82 extending outward in a direction perpendicular to the axis of the exhaust pipe 50 at a peripheral edge of the exhaust pipe 50 and an opening edge of the other opening of the cylindrical portion 81 inward in a direction perpendicular to the axis of the exhaust pipe 50. A spring receiving member 80 provided with an extended constricted portion 83 surrounds the outer peripheral surface of the upstream exhaust pipe 10 in the substantially cylindrical portion 81 and is integrally fastened and fixed by a bolt / nut 90 in a flange portion 82. I have.

A coil spring 7 which generates a spring force between the narrow portion 83 of the spring receiving member 80 and the flange 20 so as to constantly press the seal body 30 toward the downstream exhaust pipe 50.
0 is disposed on the outer peripheral surface of the upstream side exhaust pipe 10.

The use of this spring means has the added advantage that angular displacements in all directions (360 degrees) occurring in both exhaust pipes can be tolerated.

In the above-described embodiment, the sealing portion 43 of the compression ring 40 is formed by the inner surface 41 of the cylindrical mesh member and both end surfaces of the mesh member connected to the inner surface 41, or the outer circumferential surface of the cylindrical mesh member and the outer circumferential surface thereof. Although the example in which both ends of the mesh connected to the surface are formed by filling and coating the refractory material has been described, as still another example, the inner surface 41 of the cylindrical mesh and the both ends and the cylinder of the mesh connected to the inner surface 41 It is possible to use a compression ring formed by filling and coating the outer peripheral surface of the reticulated body and both end surfaces of the reticulated body connected to the outer peripheral surface with a refractory material, and by using this compression ring,
The sealing effect against the exhaust gas leaking through the sliding gap between the inner surface 31 of the spherical band-shaped seal body 30 and the outer peripheral surface of the end of the upstream exhaust pipe 10 where the seal body 30 is fitted and seated is enhanced.

FIG. 4 shows another example of the present invention.
The spherical exhaust pipe joint of the present embodiment has an inner surface 31 of a spherical band-shaped seal body 30 defining a through hole and a compression ring 40 defining a through hole.
Between the inner surface 41 of the vibration absorbing portion 42 and the outer peripheral surface of the pipe end 11 of the upstream exhaust pipe 10 is provided with a vibration absorbing cylinder 101 made of a net-like body. The spherical band-shaped seal 30 and the compression ring 40 are connected to the upstream exhaust pipe 10.
At the end 11 of the tube. The vibration absorbing cylinder 101 attached to the outer peripheral surface of the tube end 11 is made of the same material as the vibration absorbing section 42. That is, the vibration absorbing cylinder 101 is formed by winding a metal wire mesh obtained by weaving or knitting a thin metal wire, for example, a stainless steel wire or a galvanized iron wire into a cylindrical shape, and forming the cylindrical body. It is obtained by compressing in the direction. Therefore, since the vibration absorbing cylinder 101 and the vibration absorbing portion 42 are formed of the same material, they may be integrally formed. In this example, one end of the upstream exhaust pipe 10 is connected to the small-diameter short pipe 10.
2 is connected to the upstream side exhaust pipe main body 104 by a connecting pipe 103, and the compression ring 40 is disposed so as to be surrounded by an annular annular projection 105 formed integrally with the flange 20.
One end of the bolt 60 is fixed by sandwiching the flange 20 by a flange portion 106 formed integrally with the bolt 60 and a nut 107 screwed to the bolt 60.

The thus-formed spherical exhaust pipe joint of the example of FIG. 4 not only performs the same operation as the above-described embodiment, but also
Since the vibration absorbing cylinder 101 is provided, the above relative angular displacement is further allowed by the compression and restoration thereof, and in addition, the exhaust gas on the upstream side is passed through the tube end portion 11, the spherical band-shaped seal body 30 and the concave spherical portion 51. Vibration transmitted from the pipe 10 to the downstream exhaust pipe 50 can be reduced.

[0042]

The spherical exhaust pipe joint of the present invention having the above-described structure has the following specific effects.

The relative angular displacement generated between the upper and downstream exhaust pipes can be maintained while maintaining the sealing function between the outer convex spherical surface of the spherical belt-shaped seal body and the concave spherical surface of the downstream exhaust pipe by sliding contact. It is possible to prevent the leakage of the exhaust gas from the relevant portion while allowing it.

The relative axial displacement generated between the upper and the lower exhaust pipes is distributed between the large-diameter end face of the spherical belt-shaped seal attached to the outer peripheral face of the pipe end of the upstream exhaust pipe and the flange. Since the compressed ring is compressed and restored in the relative axial direction, the relative axial displacement generated between the exhaust ring and the exhaust pipe can be allowed.

Leakage of exhaust gas from the sliding gap between the inner surface of the spherical belt-shaped seal and the outer peripheral surface of the upstream exhaust pipe on which the seal is mounted is caused by the gap between the end face of the seal and the flange. Can be prevented by the sealing of the compression ring arranged in

According to the above effects, it is possible to prevent the vibration of the engine from being transmitted to the vehicle body and the muffler.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view showing a spherical exhaust pipe joint of the present invention.

FIG. 2 is a longitudinal sectional view showing another embodiment of the spherical exhaust pipe joint of the present invention.

FIG. 3 is a longitudinal sectional view showing another embodiment of the spherical exhaust pipe joint of the present invention.

FIG. 4 is a longitudinal sectional view showing still another embodiment of the spherical exhaust pipe joint of the present invention.

FIG. 5 is a longitudinal sectional view showing a conventional spherical exhaust pipe joint.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 Upstream exhaust pipe 20 Flange 30 Spherical band-shaped seal body 40 Compression ring 42 Vibration absorption part 43 Sealing part 50 Downstream exhaust pipe 51 Concave spherical surface part 52 Flange part 60 Head bolt 70 Coil spring

──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Toshiyuki Nishio 8 Kirihara-cho, Fujisawa-shi, Kanagawa Prefecture, Oiles Industry Co., Ltd. References JP-A-2-1688074 (JP, A) JP-A-59-65924 (JP, U) (58) Fields investigated (Int. Cl. ⁶ , DB name) F01N 7/08 F16J 15/12 F16L 27 / 12

Claims (5)

(57) [Scope of request for utility model registration] An exhaust pipe connected to an engine side of an automobile and a downstream exhaust pipe connected to a muffler side are connected to each other, and a relative angular displacement and a relative axial displacement generated between the exhaust pipes are connected to each other. a allowable spherical exhaust pipe joint, on the upstream side exhaust pipe, the flange is integrally fixed to the outer peripheral surface thereof. The upstream exhaust pipe, having an inner surface defining a transmural hole, the flange-side spherical annular seal member having an end face to the maximum diameter of the convex spherical portion of said end face and having a convex spherical portion on the outer surface That you are wearing it. A through hole is provided between the end face of the seal body and the flange.
A vibration absorbing portion formed of a cylindrical mesh having an inner surface to be defined ; an inner surface of the mesh and an end surface of the mesh connected to the inner surface;
And an outer peripheral surface of the net and an end of the net connected to the outer peripheral surface
Disposed in close contact is allowed to the end face of each compression ring with a sealing portion made of a refractory material filled coated integrally has the end face flange and the seal member to at least one of the surfaces That The downstream exhaust pipe, said being concave spherical surface portion corresponding to the outer surface convex spherical portion of the seal body is formed, the downstream side exhaust pipe, and the concave spherical portion is in sliding contact with the convex spherical portion of said seal body Being arranged. The upstream exhaust pipe and downstream exhaust pipe, always downstream exhaust pipe
And the convex spherical surface of the spherical belt-shaped seal mounted on the upstream side exhaust pipe are connected by spring means for making tight sliding contact with a spring force . A spherical exhaust pipe joint having the above configuration. The concave spherical portion opening edge of claim 2 wherein said downstream exhaust pipe
Has a flange portion integrally formed , and the spring means
One end fixed to the flange, the other end a flange portion fitting to arranged a pair of headed bolts and a pair of coil springs disposed between the head and off <br/> flange portion of the bolt Prepare
Spherical exhaust pipe joint according to claim 1 comprising. Wherein the concave spherical portion opening peripheral edge of the downstream exhaust pipe
Has a flange portion integrally formed , and the spring means
A spring receiving member fixed to the flange portion, the receiving end the spring member, the spherical exhaust pipe joint according to claim 1, which comprises a coil spring disposed in contact with the other end canvas lunge. 4. A spherical annular seal member is a spherical exhaust pipe joint according to claims 1, which is put in engagement with the seating on the upstream side exhaust pipe in any one of 3. Outside peripheral surface of 5. The upstream exhaust pipe, the vibration absorbing tube body made of mesh body are deposited, the spherical annular seal member and the compression ring via a vibration absorbing accommodating cylinder upstream spherical exhaust pipe joint according to any one of claims 1 to side exhaust pipes are allowed instrumentation wearing 3.