JPH04295123A - Shell for muffler and its manufacture - Google Patents

Abstract

PURPOSE:To reduce generation of emission noise from a shell more largely than usual and eliminate generation of chattering noise, in a muffler sheel which is used as an outer cylinder with both end openings tight-closed by edge plates, and its manufacture. CONSTITUTION:A plate material 49 which is formed from flat parts 43, 45 and a wave-shaped part 41 alternately and continuously is wound at least three times so that the wave-shaped part 41 may be positioned between the flat parts 43 and 45 to be formed, and the flat parts 43, 45 and the wave-shaped part 41 are brazed with each other. Besides, the plate material on at least one surface of which a braze layer is formed is wound at least three times so that the wave-shaped part may be positioned between the flat parts to form a temporary shell.

Description

[Detailed description of the invention]

0001

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a shell for a silencer, which is used as an outer cylinder with openings at both ends sealed by end plates.

0002

[Prior Art] Generally, in automobiles, for example,
A silencer as disclosed in Japanese Patent No. 2-111919 is used. Figure 6 shows this type of silencer.
In this muffler, the openings at both ends of the cylindrical shell 11 are connected to the end plate 1.
3 and 15, an inlet pipe 19 is inserted through the end plate 13 and the partition plate 17, and an outlet pipe 23 is inserted through the end plate 15 and the partition plate 21.

However, such a muffler has a problem in that the exhaust gas ejected from the inlet pipe 19 into the shell 11 collides with the shell 11, and the vibration of the shell 11 generates so-called radiated sound. Therefore, the present applicant previously proposed, as shown in Utility Application No. 2-6339, a plate material 31 on which flat parts 25, 27 and wavy parts 29 were formed, as shown in FIG. 8, as shown in FIG. A shell was filed in which the shell was wound three times so that the wavy part 29 was located between the flat parts 25 and 27, and the ends were spot welded 33.

[0004] Since such a shell has the wavy portion 29 between the flat portion 25 and the flat portion 27, the radiated sound can be effectively reduced.

[0005]

However, in such a silencer shell, since the wavy portion 29 is simply disposed between the flat portion 25 and the flat portion 27, the wavy portion 2
9 and the flat portions 25 and 27 vibrate relative to each other, resulting in a problem that so-called chatter noise is generated. The present invention has been made in order to solve such conventional problems, and includes a shell for a silencer that can significantly reduce the generation of sound radiated from the shell than before, and also eliminate the generation of chatter noise. It is an object of the present invention to provide a method for manufacturing a shell for a silencer.

[0006]

[Means for Solving the Problems] A shell for a silencer according to the present invention includes a plate material in which flat portions and wavy portions are alternately and consecutively formed. It is formed by being wound heavily, and the flat part and the wavy part are brazed to each other. The method for producing a shell for a silencer according to the present invention includes a plate material in which flat portions and wavy portions are alternately and continuously formed and a brazing metal layer is formed on at least one surface, such that the wavy portion is located between the flat portions. To,
After forming a temporary shell by winding it at least three times, flux is applied to this temporary shell, and then, by heating the temporary shell in a furnace, the contact portion between the flat part and the corrugated part is formed. They are brazed to each other.

[0007]

[Operation] In the silencer shell of the present invention, the flat portion and the corrugated portion are brazed and fixed to each other. In the method for manufacturing a silencer shell of the present invention, a plate material on which a brazing metal layer is formed on at least one surface is used, a temporary shell is formed by winding this plate material, flux is applied to this temporary shell, and a By heating therein, the flat part and the corrugated part are brazed together.

[0008]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The details of the present invention will be explained below with reference to the drawings. FIG. 1 shows an embodiment of a muffler shell of the present invention, and this muffler shell is constructed by arranging flat parts 43 and 45 on the outside and inside of a wavy part 41 wound in an elliptical shape. The flat portions 43, 45 and the wavy portion 41 are brazed to each other at their abutting portions to form a brazed portion 47.

[0009] The silencer shell constructed in this way has the following features:
It is manufactured as described below. That is, first, a plate material 49 as shown in FIG. 2 is prepared. The plate material 49 has a thickness of, for example, 0.15 to 0.2 mm, and flat portions 43 and 45 are formed on both sides of the corrugated portion 41. Further, the plate material 49 is made of aluminum, for example, and a brazing material layer 51 is formed on one side of the plate material 49, as shown in FIG.

[0010] In this embodiment, the flat portions 43, 45
Bent portions 53 are formed on both sides. Next, this plate material 49 is wound three times so that the wavy portion 41 is located between the flat portions 43 and 45, and the bent portion 53 is bent 90 degrees toward the end surface. A temporary shell 55 as shown in FIG. 4 is formed.

After that, flux is applied to this temporary shell 55, and after drying the flux, the temporary shell 55 is heated in a furnace to form flat parts 43, 45 and wavy parts 4.
1 and the abutting portions are brazed to each other to produce a muffler shell as shown in FIG. Therefore, in the silencer shell described above, the plate material 49 on which the flat parts 43 and 45 and the wavy part 41 are formed is triple-wound so that the wavy part 41 is located between the flat parts 43 and 45. Since the flat parts 43, 45 and the wavy part 41 are brazed to each other, the generation of sound radiated from the shell can be significantly reduced compared to the conventional case, and the generation of chatter noise can be eliminated. It becomes possible.

That is, in the silencer shell constructed as described above, since the wavy portion 41 is formed between the flat portions 43 and 45, the generation of sound radiated from the shell can be significantly reduced compared to the conventional one. Furthermore, since the flat portions 43 and 45 are firmly brazed to the inside and outside of the corrugated portion 41, relative vibration between the corrugated portion 41 and the flat portions 43 and 45 is eliminated, thereby eliminating chatter noise. Can be done.

FIG. 5 shows another embodiment of the method for manufacturing a silencer shell according to the present invention. In this embodiment, a brazing material layer made of aluminum, for example, is formed on the inside of a temporary shell 55. In this state, flux is applied to the temporary shell 55 and the partition plates 57, 59, and after the flux dries, the temporary shell 55 and the partition plates 57, 59 are heated in a furnace. By this,
The contact portions between the flat portions 43 and 45 and the corrugated portion 41 and the flat portion 43 and the partition plates 57 and 59 are brazed to each other.

[0014]

As described above, in the silencer shell of the present invention, the plate material in which the flat portions and the wavy portions are alternately and continuously formed is arranged so that the wavy portions are located between the flat portions. Since it is formed by three layers of winding, and the flat part and the wavy part are brazed to each other, it is possible to significantly reduce the sound radiated from the shell compared to the conventional case, and also eliminate the occurrence of chatter sound. Can be done.

Further, in the method of manufacturing a shell for a silencer according to the present invention, the flat portions and the wavy portions are alternately and continuously formed, and the plate material having the brazing material layer formed on at least one surface is placed between the flat portions and the wavy portions. After forming a temporary shell by winding it at least three times so that Since the abutting portions of the two are brazed to each other, there is an advantage that the silencer shell of the present invention can be manufactured easily and reliably.

[Brief explanation of drawings]

FIG. 1 is a side view showing one embodiment of a silencer shell of the present invention.

FIG. 2 is a top view showing a plate material used for manufacturing the silencer shell of FIG. 1;

FIG. 3 is a sectional view showing details of the plate material.

FIG. 4 is a perspective view showing a temporary shell.

FIG. 5 is a sectional view showing a state in which the partition plate is inserted into the temporary shell.

FIG. 6 is an explanatory diagram showing a conventional muffler.

FIG. 7 is a top view showing a plate material used in the silencer shell previously proposed by the present applicant.

FIG. 8 is a side view showing a shell for a muffler made earlier by the applicant.

[Explanation of symbols]

41 Wavy part 43,45 Flat part 47 Brazing part 49 Plate material 51 Brazing metal layer 55 Temporary shell

Claims (2)

[Claims] [Claim 1] Flat parts (43, 45) and wavy parts (41
) is formed by winding it at least three times so that the wavy part (41) is located between the flat parts (43, 45), and A shell for a silencer, characterized in that flat parts (43, 45) and wavy parts (41) are brazed to each other. [Claim 2] Flat parts (43, 45) and wavy parts (41
) are formed alternately and continuously, and a plate material (49) on which a brazing material layer (51) is formed on at least one surface is connected to the flat part (
43, 45) so that the wavy portion (41) is located between
After forming a temporary shell (55) by winding it at least three times, applying flux to this temporary shell (55), and then heating the temporary shell (55) in a furnace,
A method of manufacturing a shell for a silencer, characterized in that the contact portions of the flat portions (43, 45) and the wavy portions (41) are brazed to each other.