JP2008121550A - Connection structure of exhaust system member and insertion member - Google Patents

Abstract

PROBLEM TO BE SOLVED: To sputter the inside of an exhaust system member when welding the end part of an exhaust system member composed of a first divided member and a second divided member and the outer peripheral surface of an insertion member over the entire circumference in the middle. Provision of a connection structure between an exhaust system member and an insertion member that can prevent the intrusion of the material.
SOLUTION: A first divided portion 44 and a second divided portion 45a are provided, both divided portions 44, 45 are overlapped in the middle, and a corresponding protrusion 45c is fitted inside each bulging portion 44c, And after making the whole section into a circular section by abutting the ends of the two divided portions 44, 45, the diffuser 43 is formed by fixing both side edges of the two divided portions 44, 45 with welding X1, After the catalyst carrier case 41 was inserted into the end 43a of the diffuser 43, the end and the outer peripheral surface of the catalyst carrier case 41 were fixed by welding X2 over the entire circumference.
[Selection] Figure 2

Description

  The present invention relates to a connection structure between an exhaust system member and an insertion member.

Conventionally, as shown in FIG. 6, both side edges of the substantially semi-cylindrical divided portion 011 are overlapped inside the bulging portion 012 a bulged outward from both side edge portions of the substantially semi-cylindrical divided portion 012. After making the whole into a substantially circular cross section, the exhaust system member 010 is formed by welding and fixing both side edges of the divided parts 011,012, and an insertion member (not shown) is inserted into the end of the exhaust system member 010. After that, the technology of the connection structure of the exhaust system member and the insertion member in which the end portion and the outer peripheral surface of the insertion member are fixed by welding over the entire circumference is known (see Patent Documents 1 and 2).
JP 2004-92512 A Japanese Patent Laid-Open No. 9-329019

  However, in the conventional invention, a gap O (see FIG. 6) is generated between the end of the exhaust system member and the insertion member. Therefore, when these two are welded over the entire circumference, the gap O is formed. In order to close it, a large amount of welding material is required, and a relatively long time is required.

  The present invention has been made in order to solve the above-described problems, and the end of the exhaust system member composed of the first divided member and the second divided member that are overlapped in the middle and the outer peripheral surface of the insertion member are all around the circumference. It is an object of the present invention to provide a connection structure between an exhaust system member and an insertion member that can eliminate the need for a large amount of welding material in a relatively short time during welding.

  According to the first aspect of the present invention, the first divided portion having a substantially semi-cylindrical shape having a bulging portion that bulges outward except for the end portions on both side edges, and the end portions on both side edges are excluded. A substantially semi-cylindrical second divided portion having a projecting portion that can be fitted inside the corresponding bulged portion of each of the first divided portions; The exhaust system is fitted by fitting the corresponding protrusions on the inside and butting the ends of the two divided parts together to form a circular cross section as a whole, and then welding and fixing both side edges of the two divided parts. After the member is formed and the insertion member is inserted into the end of the exhaust system member, the end and the outer peripheral surface of the insertion member are fixed by welding over the entire circumference.

  According to the first aspect of the present invention, the first divided portion having a substantially semi-cylindrical shape having a bulging portion that bulges outward except for the end portions on both side edge portions, and end portions on both side edge portions. Except for a first semi-cylindrical second divided portion having a projecting portion that can be fitted inside the corresponding bulging portion of each of the first divided portions. After fitting the corresponding projecting parts inside the protruding parts and butting the ends of the two divided parts into a circular cross section as a whole, the both side edges of the two divided parts are fixed by welding. After the exhaust system member is formed by inserting the insertion member into the end portion of the exhaust system member, the end portion and the outer peripheral surface of the insertion member are welded and fixed over the entire circumference. A large amount of welding material is not required in a relatively short time when welding the end of the exhaust system member consisting of the members and the outer peripheral surface of the insertion member over the entire circumference. It can be.

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

Example 1 will be described below.
A case will be described in which the exhaust system member is a diffuser of a catalytic converter, and the insertion member is a catalyst carrier case containing a catalyst carrier.
FIG. 1 is a view for explaining an exhaust system employing a connection structure between an exhaust system member and an insertion member according to a first embodiment of the present invention, FIG. 2 is an exploded perspective view of the diffuser according to the first embodiment, and FIG. 4 and 5 are diagrams for explaining the fixing of the diffuser and the catalyst carrier case of the catalytic converter of the first embodiment.

First, the overall configuration will be described.
As shown in FIG. 1, the exhaust system adopting the connection structure of the exhaust system member and the insertion member according to the first embodiment is connected to the engine 1 through the exhaust manifold 2 and the flange 3 connected to the engine 1. A catalytic converter 4, a sub muffler 7 connected to the catalytic converter 4 via a flange 5 and a connecting pipe 6, and a main muffler 10 connected to the sub muffler 7 via a flange 8 and a connecting pipe 9. Yes.

  The catalytic converter 4 includes a metal cylindrical catalyst carrier case 41 (corresponding to an insertion member in claims), and metal cylindrical diffusers 42 and 43 connected to both ends of the catalyst carrier case 41 (claims). Equivalent to the exhaust system member of the item).

A catalyst carrier 41a (see FIG. 4) is accommodated inside the catalyst carrier case 41.
The catalyst carrier 41a is a metal catalyst carrier formed in a substantially cylindrical shape by wrapping a metal corrugated plate and a flat plate (not shown) in multiple layers, or a ceramic formed in a substantially cylindrical shape made of porous ceramics. In addition to the adoption of the catalytic catalyst carrier, the catalyst component (Pt or the like) is carried on the surface of the exhaust passage formed in the axial direction so that the exhaust gas flowing into the catalyst carrier case 41 is harmful. component (NOx, CO, etc.) which is to be discharged in the harmless substances _(CO 2, _{H 2} O, etc.) by the catalytic action.
In the case of a metal catalyst carrier, the catalyst carrier 41a is fixed by diffusion bonding in the catalyst carrier case 41. In the case of a ceramic catalyst carrier, the catalyst carrier 41a has a mat in the catalyst carrier case 41. It is press-fitted and fixed through.

  Hereinafter, since the connection structure between the catalyst carrier case 41 and the diffusers 42 and 43 is the same, the connection structure between the catalyst carrier case 41 and the diffuser 43 will be described in detail.

  As shown in FIG. 2, the diffuser 43 has a substantially semi-cylindrical first divided portion 44 having a bulging portion 44 c bulging outward at both side edge portions except for both end portions 44 a and 44 b, and both side edge portions. Except for both end portions 45a and 45b, the first divided portion 44 includes a substantially semi-cylindrical second divided portion 45 having a protruding portion 45c that can be fitted inside the corresponding bulged portion 44c.

Then, as shown in FIG. 3, the two divided portions 44 and 45 are overlapped in the middle, and the corresponding protruding portions 45 c are fitted inside the bulged portions 44 c, and both ends of the two divided portions 44 and 45 are fitted. The diffusers 43 are formed by abutting the parts together to form a circular cross section as a whole, and then fixing both side edges of the divided parts 44 and 45 by welding X1 (shown by bold lines).
At this time, the weld X1 can be welded and fixed at both side edges of the divided portions 44 and 45 with a straight weld line, and the weldability is improved.

  Next, as shown in FIG. 4, after inserting the catalyst carrier case 41 to a predetermined depth into the exhaust gas upstream end 43a of the diffuser 43, as shown in FIG. 5, the upstream end 43a and the catalyst Both of these are fixed by fixing the outer peripheral surface of the carrier case 41 over the entire periphery by welding X2.

  Here, in the conventional invention, since the bulging portion and the protruding portion are formed up to the end portion of the diffuser, a gap is generated between the end portion and the insertion member, and a large amount is required to close the gap. There is a problem that a welding material is required and a relatively long time is required.

  On the other hand, in the first embodiment, as described above, since both ends of the divided portions 44 and 45 are abutted to form a circular cross section as a whole, the exhaust gas upstream end 43a of the diffuser 43 and the catalyst carrier are disposed. A gap is not formed between the body case 41 and the spatter can be prevented from entering the diffuser 43, and both of them can be welded with a small amount of welding X2 in a relatively short time.

Further, the peripheral edge portion of the through hole of the flange 5 is fixed to the end portion 43b of the diffuser 43 on the downstream side of the exhaust gas by welding (not shown) over the entire circumference of the outer peripheral surface of the diffuser 43 in a state where the flange 5 is externally fitted. .
The catalyst carrier case 41, the diffuser 42, and the flange 3 are connected in the same manner.

Next, the effect will be described.
As described above, in the connection structure of the exhaust system member and the insertion member according to the first embodiment, the bulging portion 44c that bulges outward except for the end portions 44a and 44b at both side edge portions. A semi-cylindrical first divided portion 44 and a substantially half having protrusions 45c that can be fitted inside the corresponding bulged portions 44c of the first divided portion 44 except for the end portions 45a and 45b at both side edges. A cylindrical second divided portion 45a is provided, the divided portions 44, 45 are overlapped in the middle, the corresponding protruding portions 45c are fitted inside the bulged portions 44c, and the divided portions After the ends of 44 and 45 are brought into contact with each other to form a circular cross section, a diffuser 43 is formed by fixing both side edges of both divided portions 44 and 45 by welding X1, and an end 43a of the diffuser 43 is formed on the end 43a. After inserting the catalyst carrier case 41, the end and the outer peripheral surface of the catalyst carrier case 41 are welded over the entire circumference. Since it is fixed, when welding the X2 end of the diffuser 43 including the first divided portion 44 and the second divided portion 45a and the outer peripheral surface of the catalyst carrier case 41 over the entire circumference, a relatively short amount of welding material is used. Can be welded in time.

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 a scope not departing from the gist of the present invention are included in the present invention.
For example, the exhaust system member is not limited to the diffuser 43 of the catalytic converter 4, and the same effect can be obtained in connection with the exhaust pipe.

It is a figure explaining the exhaust system by which the connection structure of the exhaust system member of Example 1 of this invention and the insertion member was employ | adopted. It is a disassembled perspective view of the diffuser of the present Example 1. FIG. It is a perspective view of the diffuser of the first embodiment. It is a figure explaining fixation of the diffuser and catalyst carrier case of the catalytic converter of the first embodiment. It is a figure explaining fixation of the diffuser and catalyst carrier case of the catalytic converter of the first embodiment. It is a figure explaining the connection structure of the conventional exhaust system member and an insertion member.

Explanation of symbols

X1, X2 Welding 1 Engine 2 Exhaust manifold 3, 5, 8 Flange 4 Catalytic converter 6, 9 Connecting pipe 7 Sub muffler 10 Main muffler 41 Catalyst carrier case 41a Catalyst carrier 42, 43 Diffuser 43a (diffuser) end 44 First 1 split part 44a, 44b (first split part) end 44c bulging part 45 second split part 45a, 45b (second split part) end 45c Projecting part

Claims (2)

A substantially semi-cylindrical first divided portion having a bulging portion that bulges outward on both side edges excluding the end portions;
A substantially semi-cylindrical second divided portion having protrusions that can be fitted inside the corresponding bulging portions of the first divided portion except for end portions on both side edges,
The two divided parts are overlapped in the middle, the corresponding protruding parts are fitted inside the bulging parts, and the ends of the two divided parts are butted together to form a circular cross section. An exhaust system member is formed by welding and fixing both side edges of both divided parts,
A connection structure between an exhaust system member and an insertion member, wherein an insertion member is inserted into an end portion of the exhaust system member, and then the end portion and the outer peripheral surface of the insertion member are welded and fixed over the entire circumference. In the connection structure of the exhaust system member and the insertion member according to claim 1,
A connection structure between an exhaust system member and an insertion member, wherein the exhaust system member is a diffuser of a catalytic converter, and the insertion member is a catalyst carrier case containing a catalyst carrier.

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