JP2008303723A - Exhaust connection pipe - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an exhaust connection pipe capable of preventing fracture of a rendezvous pipe due to difference of thermal expansion between a shell and the rendezvous pipe. <P>SOLUTION: In the exhaust connection pipe provided with a shell shape rendezvous pipe 1 including a plural pipe connection part 1a connecting a plurality of exhaust pipes and a single pipe connection part 1b connecting an exhaust pipe 1, and a shell 2 surrounding an outer circumference of the rendezvous pipe 1 with keeping a predetermined interval, the single pipe connection part side 1a of the rendezvous pipe 1 is formed with divided into two in an axial direction, an outward turn back part 13 is formed at one divided end part of the divided single pipe connection part, an inward turn back part 15 is formed at another divided end part of the divided single pipe connection part, and both of the divided single pipe connection parts are connected slidably in an axial direction by mutual insertion engagement of the outward turn back part 13 and the inward turn back part 15. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to an exhaust connection pipe.

Conventionally, an intermediate rendezvous pipe having a plurality of pipe connecting portions for connecting a plurality of exhaust pipes and a single pipe connecting portion for connecting one exhaust pipe, and an outer periphery of the rendezvous pipe having a predetermined interval. An exhaust connection pipe having an enclosing shell is known (for example, see Patent Document 1).
JP 2004-270655 A

  However, in the exhaust connection pipe of the conventional example, since the shell is fixed to the rendezvous pipe by welding both end parts of the shell to the several pipe connection part and the single pipe connection part in the rendezvous pipe, The absorption due to the difference in thermal expansion between the shell in contact with the high temperature exhaust gas and the rendezvous tube in contact with the high-temperature exhaust gas cannot be absorbed.

  The problem to be solved by the present invention is to provide an exhaust connection pipe that can prevent breakage of the rendezvous pipe due to a difference in thermal expansion between the shell and the rendezvous pipe.

  In order to solve the above-mentioned problem, an exhaust connection pipe according to claim 1 is a rendezvous pipe having a middle shape having a plurality of pipe connection parts for connecting a plurality of exhaust pipes and a single pipe connection part for connecting one exhaust pipe. And an exhaust connecting pipe having a shell surrounding the outer periphery of the rendezvous pipe at a predetermined interval, wherein the single pipe connecting portion side of the rendezvous pipe is formed in two in the axial direction, and the both split single pipe connecting portions An outwardly folded portion that folds outward is formed at one of the divided end portions, an inwardly folded portion that folds inwardly is formed at the other divided end portion, and the outwardly folded portion and the inwardly folded portion are inserted into each other. By combining the two single pipe connection portions, the two single pipe connection portions are connected to be slidable in the axial direction.

  In the exhaust connection pipe of the present invention, as described above, the single pipe connection portion side of the rendezvous pipe is divided into two in the axial direction, and the outward folded portion is folded outward at one split end of the both split single pipe connection portions. An inwardly folded portion that is folded inwardly at the other divided end, and the single tube connecting portion that is divided into two by inserting and engaging the outwardly folded portion and the inwardly folded portion with each other is axially By adopting a slidably connected configuration, the difference in thermal expansion between the shell and the rendezvous tube can be eliminated by sliding the folded-back portion and the inward-turned portion that are inserted and engaged with each other in the axial direction. Can do.

  Therefore, it is possible to prevent the rendezvous tube from being broken due to the difference in thermal expansion between the shell and the rendezvous tube.

  Embodiments of the present invention will be described below with reference to the drawings.

  The exhaust connection pipe of the first embodiment corresponds to the invention described in claims 1, 2, 4, and 5.

  First, the exhaust connection pipe of the first embodiment will be described with reference to the drawings.

  1 is a plan view showing an exhaust connection pipe of the first embodiment, FIG. 2 is a transverse plan view showing the exhaust connection pipe of the first embodiment, and FIG. 3 is an exploded perspective view showing a rendezvous pipe in the exhaust connection pipe of the first embodiment. 4 is a longitudinal sectional view taken along line AA in FIG. 3, FIG. 5 is a longitudinal sectional view taken along line BB in FIG. 3, and FIG. 6 is a section C in FIG. 2 illustrating the operation of the exhaust connection pipe of the first embodiment. It is an enlarged view.

  The exhaust connection pipe according to the first embodiment includes an intermediate rendezvous pipe 1, a shell 2 that surrounds the outer periphery of the rendezvous pipe with a predetermined interval, and a sound absorption housed between the rendezvous pipe 1 and the shell 2. The material 3 is provided.

  More specifically, as shown in FIGS. 4 and 5, the rendezvous pipe 1 has a pair of upper and lower half-cracked pipes 11 and 12 extending downward from the joint pieces 11a formed on both side edges of the upper half-cracked pipe 11. As shown in FIG. 2, a plurality of pipe connecting portions 1a for connecting two exhaust pipes and a single pipe connecting portion 1b for connecting one exhaust pipe are joined by joining to both side edges of the half cracked pipe 12 on the side. It is formed in the middle state which has.

  2-6, the rendezvous pipe 1 is divided into two in the axial direction on the single pipe connecting portion 1b side, and outwardly folded back to the outside at the divided end on the multiple pipe connecting portion 1a side. 13 is formed, and an inward folding portion 15 that is folded inward is formed at the divided end portion on the divided pipe 14 side, and as shown in FIG. 3, in the outward folding portion 13 and the inward folding portion 15. The part facing the joining piece 11a and the joining piece 11a part are notched, and the single pipe connecting part divided into two by inserting and engaging the outward folding part 13 and the inward folding part 15 with each other is axially slid. It is connected freely.

  Further, as shown in FIG. 6, in the first embodiment, the outer peripheral surface of the outward folded portion 13 abuts on the inner peripheral surface of the divided end portion of the divided tube 14, and the inner peripheral surface of the inward folded portion 15 is The rendezvous pipe 1 is configured to come into contact with the outer peripheral surface of the split end portion of the single pipe connecting portion 1b on the multiple pipe connecting portion 1a side, whereby the outward turning portion 13 and the inward turning portion 15 are always brought into contact with each other at two points. Thus, the movement of both of these when sliding in the axial direction can be performed stably.

  Then, the rendezvous pipe 1 is assembled to the multiple pipe connecting portion 1a side and the divided pipe 14 side by first turning outward the folded portions of the upper half cracked tubes 11 and 11 on the multiple pipe connecting portion 1a side and the divided pipe 14 side. 13 and the inward turned-up portion 15 are inserted and engaged, while the upper-side folded portion 13 and the inward turned-up portion 15 of the lower half-cracked tubes 12 and 12 are inserted and engaged. 11 and 11 and both lower half cracked pipes 12 and 12 are joined by joining pieces 11a and 11a, respectively, so that the outward folded portion 13 and the inward folded portion 15 are inserted and engaged with each other. In this state, the multi-tube connecting portion 1a side and the split tube 14 side are assembled so as to be stretchable.

  Further, both ends of the shell 2 are fixedly coupled to the plurality of pipe connecting portions 1 a and the dividing pipe 14 in the rendezvous pipe 1.

  A plurality of holes 16 communicating with the inside of the shell 2 are formed in the peripheral wall of the rendezvous tube 1, and the sound absorbing material 3 is accommodated between the rendezvous tube 1 and the shell 2.

  Next, operations and effects of the first embodiment will be described.

  In the exhaust connection pipe of the first embodiment, as described above, the single pipe connection portion 1b side of the rendezvous pipe 1 is divided into two in the axial direction, and outwardly folded back to the split end portion on the multiple pipe connection portion 1a side. While the portion 13 is formed, an inwardly folded portion 15 that is folded inward is formed at the divided end portion on the divided pipe 14 side, and faces the joint piece 11a in the outwardly folded portion 13 and the inwardly folded portion 15. The portion and the joining piece 11a are notched, and the single tube connecting portion divided into two is connected to be slidable in the axial direction by inserting and engaging the outward folding portion 13 and the inward folding portion 15 with each other. As shown in FIG. 6, the direction folding portion 13 and the inward folding portion 15 in which the thermal expansion difference between the shell 2 and the rendezvous tube 1 are inserted and engaged with each other are axially arranged as shown in FIG. 6. It can be eliminated by moving.

  Therefore, it is possible to prevent the rendezvous tube 1 from being broken due to a difference in thermal expansion between the shell 2 and the rendezvous tube 1.

  Further, the outer peripheral surface of the outward folded portion 13 abuts on the inner peripheral surface of the divided end portion of the divided pipe 14, and the inner peripheral surface of the inward folded portion is a single tube connection on the multiple tube connecting portion 1 a side in the rendezvous tube 1. By being configured to abut on the outer peripheral surface of the divided end portion of the portion 1b, generation of noise due to vibration can be suppressed.

  Moreover, the part facing the joining piece 11a and the part of the joining piece 11a in the outward folding part 13 and the inward folding part 15 are cut away, so that the upper half-cracked tube 11 and the lower half-crack in the same part are cut out. Since there is no overlapping portion for joining the tube 12, the outward folding portion 13 and the inward folding portion 15 can be smoothly slid.

A plurality of holes 16 communicating with the inside of the shell 2 are formed in the peripheral wall of the rendezvous pipe 1, and the sound absorbing material 3 is accommodated between the rendezvous pipe 1 and the shell 2, so In addition, the sound energy of the exhaust gas that has entered between the rendezvous pipe 1 and the shell 2 through each hole 16 is buffered and attenuated by the sound absorbing member 3, so that a noise reduction effect can be obtained.
Therefore, it is possible to prevent noise due to high temperature of the peripheral portion and air flow noise that are particularly likely to occur in the rendezvous pipe 1 where two exhaust gas flows gather or branch.
Further, although the exhaust gas enters between the rendezvous tube 1 and the shell 2 from the part facing the joining piece 11a in the outward folding part 13 and the inward folding part 15 and the cutout part of the joining piece 11a part, the outside There is no problem because it does not leak.

  Next, another embodiment will be described. In the description of the other embodiments, the same components as those of the first embodiment are not shown, or the same reference numerals are given and the description thereof is omitted, and only the differences are described.

  The exhaust connection pipe of this embodiment corresponds to the invention described in claims 1 and 3 to 5.

  The second embodiment shows a modified example of the exhaust connection pipe in the first embodiment. FIG. 7 (an exploded perspective view showing a rendezvous pipe), FIG. 8 (a longitudinal sectional view taken along the line DD in FIG. 7), As shown in FIG. 9 (longitudinal sectional view taken along line EE in FIG. 7), the rendezvous pipe 1 is formed with a pair of upper and lower half-cracked pipes 11 and 12 on both side edges of the half-cracked pipes 11 and 12, respectively. The outer flanges 11b and 12b are joined in the middle, and the outwardly folded portion 13 and the inwardly folded portion 15 facing the outward flanges 11b and 12b and the outward flange portion are notched. This is different from the first embodiment.

  Therefore, in the second embodiment, the same effect as in the first embodiment can be obtained.

  Although the present embodiment has been described above, the present invention is not limited to the above-described embodiment, and design changes and the like within the scope not departing from the gist of the present invention are included in the present invention.

  For example, in the embodiment, the outward folding portion 13 that is folded outward is formed at the divided end portion on the multiple tube connecting portion 1a side, while the inward folding portion 15 that is folded inward on the divided end portion on the divided tube 14 side is formed. Contrary to the above, an inwardly folded portion that folds inward is formed at the divided end portion on the multiple tube connecting portion 1a side, while an outer portion that folds outward on the divided end portion on the divided divided tube 14 side is formed. A direction folding portion may be formed.

  In the embodiment, a plurality of holes 16 communicating with the inside of the shell 2 are formed in the peripheral wall of the rendezvous tube 1, and the sound absorbing material 3 is accommodated between the rendezvous tube 1 and the shell 2. Even if the holes 16 and the sound absorbing material 3 are omitted, a heat insulating effect and a predetermined silencing effect can be obtained.

  Further, the exhaust connection pipe of the present invention can be used for either a collecting pipe or a branch pipe.

2 is a plan view showing an exhaust connection pipe of Example 1. FIG. 2 is a cross-sectional plan view showing an exhaust connection pipe of Example 1. FIG. 2 is an exploded perspective view showing a rendezvous pipe in the exhaust connection pipe of Embodiment 1. FIG. It is a longitudinal cross-sectional view in the AA line of FIG. It is a longitudinal cross-sectional view in the BB line of FIG. FIG. 3 is an enlarged view of a C part in FIG. 2 illustrating the operation of the exhaust connection pipe of the first embodiment. 6 is an exploded perspective view showing a rendezvous pipe in the exhaust connection pipe of Embodiment 2. FIG. It is a longitudinal cross-sectional view in the DD line of FIG. It is a longitudinal cross-sectional view in the EE line of FIG.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Rendezvous pipe 1a Multiple pipe connection part 1b Single pipe connection part 11 Upper half crack pipe 11a Joining piece 11b Outward flange 12 Lower half crack pipe 12b Outward flange 13 Outward turn part 14 Divided pipe 15 Inward turn part 16 Hole 2 Shell 3 Sound absorbing material

Claims (5)

An intermediate rendezvous pipe having a plurality of pipe connecting portions for connecting a plurality of exhaust pipes and a single pipe connecting portion for connecting a single exhaust pipe, and a shell surrounding the outer periphery of the rendezvous pipe with a predetermined interval In the exhaust connection pipe with
The single pipe connecting part side of the rendezvous pipe is divided into two parts in the axial direction, an outward folded part is formed at one split end part of both split single pipe connection parts, and an inner side is formed at the other split end part. An inward turn-up portion is formed that turns back to
An exhaust connection pipe characterized in that the two single pipe connecting portions divided into two are connected to be slidable in the axial direction by inserting and engaging the outwardly folded portion and the inwardly folded portion. 2. The exhaust connection pipe according to claim 1, wherein the rendezvous pipe is formed by extending a pair of half-cracked pipes to a side edge of one of the half-cracked pipes, and a side edge of the other half-cracked pipe Formed in the middle of joining,
An exhaust connection pipe, wherein a portion of the outwardly folded portion and the inwardly folded portion facing the joining piece and the joining piece portion are cut out. The exhaust connection pipe according to claim 1, wherein the rendezvous pipe is formed in a middle state in which a pair of half-cracked pipes are joined by outward flanges formed on both side edges of the half-cracked pipes, respectively.
The exhaust connection pipe, wherein a portion facing the outward flange in the outwardly folded portion and the inwardly folded portion and the outward flange portion are notched.   The exhaust connection pipe according to any one of claims 1 to 3, wherein an outer peripheral surface of the outward folded portion is in contact with an inner peripheral surface of the divided end portion of the divided divided tube, and an inner periphery of the inward folded portion. An exhaust connection pipe characterized in that the surface abuts against the outer peripheral surface of the split end portion of the single pipe connection portion on the multiple pipe connection portion 1a side in the rendezvous pipe. The exhaust connection pipe according to any one of claims 1 to 4, wherein a plurality of holes communicating with the inside of the shell are formed in a peripheral wall of the rendezvous pipe.
An exhaust connection pipe, wherein a sound absorbing material is accommodated between the rendezvous pipe and the shell.

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