JPH10196360A - Protector fixing structure of exhaust system part - Google Patents

Abstract

PROBLEM TO BE SOLVED: To surely caulk a shell part and a protector without forming a protrusion on the end part of the shell part and interference of the shell part and the protector with a weld joint. SOLUTION: The protector fixing structure of an exhaust system part is formed such that a first member 7 having a flange part and a second member 8 having a flange part are welded and joined together 9 at the outside ends of end parts in a state that respective end parts are mated with each other, the first and second members 7 and 8 have respective shell parts 1 and 2, at least one shell part 1, (2) of the first and second members 7 and 8 has a protector 3, (4) with which the shell part 1, (2) is covered from the outside, the protector 3, (4) and the shell part 1, (2) covered with the protector have end parts on one side bent at the end parts on the other side and adhered to the end pars on the other side and caulked.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a structure for fixing a protector of an exhaust system component having a protector.

[0002]

2. Description of the Related Art Exhaust system components include:
Alternatively, a protector may be provided on the outside in order to reduce a thermal influence on surrounding components. For example,
Toyota Technical Publications (issue number 6024, issue date 1996)
As shown in FIG. 5, the lower shell 2
A catalytic converter having a protector 24 on two sides is disclosed. In the catalytic converter, the upper shell 21 and the lower shell 22 are joined and welded 29 at the outer end of the end, and the protector 24 is fixed by caulking to the convex portions 31 and 32 provided on the surface of the joining portion. If the mating part surface is flat, the protector may interfere with the weld joint (weld bead) when caulking and fixing the protector, and the weld joint (weld bead) may be cracked. Since the convex portions 31 and 32 are formed, the protector 24 is firmly fixed to the shell without interfering with the welded joint 29.

[0003]

However, the upper shell 2
1 and lower shell 22 at welded joint 29 and protector 24
It is necessary to form the convex portions 31 and 32 on all the upper shell 21 and the lower shell 22 in order to prevent interference between the upper and lower shells. In addition, the flange portion (matching portion) must be long to form the convex portion, and the component shape becomes large. An object of the present invention is to provide an exhaust system component in which a protector is attached to at least one of an upper shell and a lower shell having no convex portion at an end without causing interference with a welded joint.

[0004]

The present invention to achieve the above object is as follows. A first member having a flange portion and a second member having a flange portion are welded to each other at an end outer end in a state where respective ends thereof are joined, and the first member and the second member are joined together. Each of the members has a shell (shell portion), and at least one of the first member and the second member has a protector for covering the shell from the outside, and is covered by the protector and the protector. The shell portion is a protector fixing structure for an exhaust system component, in which one end is folded back at the other end and is crimped to the other end.

[0005] In the above-mentioned protector fixing structure for the exhaust system component, the member having at least one of the first member and the second member is caulked by bringing the end of the protector into close contact with the end of the shell of the member. Or the end of the shell of the member is closely attached to the end of the protector to form a member provided with the protector, and the welded joint is formed at the opposite ends of the first member and the second member. Since it is provided on the outer end, even if the shell of the first member and the second member is not provided with a convex portion, the swaged portion between the protector and the shell does not interfere with the welded joint.

[0006]

1 and 2 show a first embodiment of the present invention, FIG. 3 shows a second embodiment of the present invention, and FIG. 4 shows a third embodiment of the present invention. . Portions common to the first, second, and third embodiments are denoted by the same reference numerals in the first, second, and third embodiments. Although the first, second, and third embodiments show examples in which the present invention is applied to a muffler, the present invention can also be applied to exhaust system components such as a catalytic converter.

First, a first embodiment of the present invention will be described with reference to FIGS. FIG. 1 is a perspective view of a muffler which is an exhaust system component, and FIG. 2 is a sectional view taken along line 2-2 of FIG.
In the muffler, a first member 7 having a flange portion 10 and a second member 8 having a flange portion 11 are welded to each other at an end outer end 9 in a state where their respective ends are aligned. First
The member 7 and the second member 8 have shell portions 1 and 2 respectively, and both the first member 7 and the second member 8 have protectors 3 and 4. In each of the first member 7 and the second member 8, the ends of the shells 1 and 2 are connected to the protectors 3 and 4.
And the shell portions 1 and 2 of the first member 7 and the second member 8 are welded and joined at the respective folded portions 5 and 6. . Glass wool may be disposed in the space between the shells 1 and 2 and the protectors 3 and 4 in order to enhance the effect of reducing radiated sound.

Next, the operation of the first embodiment of the present invention will be described. In the above-mentioned muffler, the end of the shell 1 is the protector 3
And the first member 7 in which the protector 3 is brought into close contact with the shell 1, the end of the shell 2 is folded at the end of the protector 4, and the protector 4 is The second member 8 which is brought into close contact with the second member 8 is welded 9 at the folded portions 5 and 6 of the shell portions 1 and 2, respectively.
Therefore, the protectors 3 and 4 and the shells 1 and 2 are fixed by caulking without interfering with the welded joints 9 without the conventionally provided protrusions at the ends of the shells. Also, since the shells 1 and 2 are heated to a high temperature by the exhaust gas, the protectors 3 and 4 are air-cooled. Expansion difference). In the first embodiment of the present invention, the shells 1, 2 are folded back at the ends of the protectors 3, 4, and the shells 1, 2 and the protectors 3, 4 are fixed not by welding but by caulking. The shells 1 and 2 are slidable outward with respect to the protectors 3 and 4. When the shells 1 and 2 slide outward at high temperatures, the shells 1 and 2 and the protectors 3 and 4 are slidable.
4 can be absorbed. Also, since the shell portions 1 and 2 are generally thicker than the protectors 3 and 4, and the protectors 3 and 4 are caulked by the thick shell portions 1 and 2, sufficient mounting rigidity can be obtained. In addition, generation of abnormal noise due to vibration can be reduced.

In the muffler according to the second embodiment of the present invention, as shown in FIG. 3, only the first member 7 has the protector 3, and the end of the shell 1 is the end of the protector 3. The first member 7 having the protector 3 and the second member 8 having no protector are folded back and are in close contact with the end of the protector 3, and the folded portion 5 of the shell 1 of the first member 7 is formed. Is welded 9 at the end of the shell 2 of the second member 8. Further, in the second embodiment of the present invention, an example is shown in which only the first member 7 has the protector 3, but only the second member 8 may have the protector 4.

The operation of the second embodiment is as follows.
A first member 7 in which the shell 1 and the protector 3 folded at the end of the first member 7 are in close contact with each other, and a second member 8 composed of only the shell 2
Are welded to each other at the outer ends of the ends, so that the shell 1 does not interfere with the welded joint without interfering with the welded joint, even if the end of the shell 1 is not formed as in the conventional case. The protector 3 is fixed by swaging. The shell 1 is heated by the exhaust gas, while the protector 3 is air-cooled, so that a difference in heat extension occurs between the shell 1 and the protector 3. In the second embodiment of the present invention, the shell 1 is folded back at the end of the protector 3, and the shell 1 and the protector 3 are fixed by swaging instead of fixing by welding. Slidable to the outside,
The difference in thermal elongation can be absorbed. Further, since the shell portion 1 is usually thicker than the protector 3 and has a structure in which the protector 3 is caulked with a thicker shell member, sufficient mounting rigidity is obtained, and generation of abnormal noise due to vibration occurs. Can be reduced.

In the muffler according to a third embodiment of the present invention, as shown in FIG. 4, both the first member 7 and the second member 8 have the protectors 3 and 4, and the first member In each of 7 and the second member 8, the ends of the protectors 3 and 4 are folded back at the ends of the shells 1 and 2 and are in close contact with the shells 1 and 2, and the first member 7 and the second The protectors 3 and 4 of the member 8 are welded at the respective folded portions 15 and 16. Glass wool may be disposed in the space between the shells 1 and 2 and the protectors 3 and 4 in order to enhance the effect of reducing radiated sound. Further, in the third embodiment of the present invention, an example is shown in which both the first member 7 and the second member 8 have protectors. Either one may have a protector.

The operation of the third embodiment is such that the protector 3 is folded at the end and the first member 7 is in close contact with the shell 1, and the protector 4 is folded at the end and is in contact with the second member 2 8 is welded at each of the folded portions 15 and 16, so that the welded joint is formed when the protectors 3 and 4 are folded even if no convex portion is formed at the end of the shell as in the conventional case. The shell and the protector are fixed by caulking without interfering with the shell. Protectors 3 and 4 are shells 1
2 and the protectors 3 and 4 and the shells 1 and 2
Is fixed not by welding but by caulking, so that the protectors 3 and 4 can slide outward with respect to the shells 1 and 2, and can absorb a difference in thermal elongation at high temperatures.

[0013]

According to the present invention, a member having at least one of the first member and the second member has a protector in which the end of the protector is swaged to the end of the shell of the member, or By caulking the end of the shell of the member to the end of the protector, the member is provided with the protector, and the welded joint is provided at the outer end of the first member and the second member at the outer ends of each other. A protector fixing structure for an exhaust system component in which a caulked portion between the shell and the protector does not interfere with a welded joint even if a convex portion is not formed at the end of the shell of the first member and the second member. Become.

[Brief description of the drawings]

FIG. 1 is a perspective view of a muffler according to a first embodiment of the present invention.

FIG. 2 is a sectional view taken along line 2-2 of FIG.

FIG. 3 is a sectional view of a muffler according to a second embodiment of the present invention.

FIG. 4 is a sectional view of a muffler according to a third embodiment of the present invention.

FIG. 5 is a sectional view of a conventional catalytic converter.

[Explanation of symbols]

 1, 2 shell part 3, 4 protector 5, 6, 15, 16 folded part 7 first member 8 second member 9 welded joint 10, 11 flange

Claims (1)

[Claims] 1. A first member having a flange portion and a second member having a flange portion are welded to each other at an outer end of the end in a state where respective ends thereof are joined to each other, and the first member is provided. And the second member each have a shell. At least one of the first member and the second member has a protector that covers the shell from outside, and the protector and the protector The covered shell portion is a protector fixing structure for an exhaust system component, in which one end portion is folded back at the other end portion and is closely adhered to the other end portion.