JP2002206422A - Shell for muffler - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a shell for muffler, enabling to minimization of the use of corrosive steel plates forming the inside of expensive materials thereof, having corrosiveness and durability on the inner and outer surfaces thereof, having superior functions to reduce transmission noise and prevent exhaust gas from leaking, and enabling to simplify a manufacturing process. SOLUTION: This shell for muffler comprises an inner layer member A formed with a corrosive material with respect to a corrosive component contained in exhaust gas condensed water and an outer layer member B formed with a corrosive material with respect to a corrosive component present in a running environment, continuously welded to each other to be formed into a tubular shape. The continuous welding of the inner layer member A with the outer layer member B is performed by mash seam welding, plasma welding, TIG welding, or laser welding.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a shell provided near a terminal exhaust port of a vehicle muffler.

[0002]

2. Description of the Related Art A muffler for a vehicle, and a shell mounted near a terminal exhaust port are also found in JP-A-11-207425.
In general, a structure in which a steel plate is wound into two or more layers to reduce transmitted sound and prevent leakage of exhaust gas is used. 4 to 6 show examples of the structure. The example of FIG. 4 is a cross-sectional view of an example in which a steel plate 1 having good corrosion resistance to corrosive components in condensed water of residual exhaust gas is double-wrapped to form a muffler shell. The winding start and the winding end are integrally fixed to the main body by a spot weld 2. This structure is designed to prevent corrosion components in the condensed water of exhaust gas. Therefore, the structure shown in FIG.
As shown in FIG. 7, the protective cover 3 may be covered.
The protective cover 3 is also integrally fixed to the main body by the spot welds 2. Further, as shown in FIG. 6, the abutting edges of the steel plate 1 having good corrosion resistance to the corrosive components in the exhaust condensed water are rolled up without using spot welding and fixed at the mechanical joint 4, and a protective cover is provided on the outer periphery thereof. 3 which also forms a mechanical joint 5 to form a double structure.

[0003]

The example of FIG. 4 in which a steel sheet 1 capable of covering both corrosion resistance to corrosion components in exhaust condensed water and external corrosion and corrosion resistance due to salt damage, etc. is double-wrapped uses a material which is expensive in price. Was a drawback. This cost problem naturally exists when the protective cover 3 shown in FIG. 5 is covered on the outer periphery of the structure shown in FIG. In the example shown in FIG. 5, there is a further problem that the number of manufacturing steps is increased. Further, in the example in which the mechanical joints 4 and 5 are formed at the edges of the inner and outer constituent members, the functions of reducing the transmitted sound and preventing the leakage of the exhaust gas are excellent, but the mechanical joint increases the manufacturing time. Has brought.

Accordingly, the present inventor has reduced the use of the corrosion-resistant steel sheet 1 constituting the interior of a material that is expensive in price as much as possible, and has corrosion resistance and durability on both the inner and outer surfaces to reduce transmitted sound. Excellent in preventing exhaust gas leakage, and
A muffler shell that can simplify the manufacturing process was studied.

[0005]

According to the present invention, the above-mentioned objects are provided.
An inner layer member made of a corrosion-resistant material against corrosion components in exhaust condensed water and an outer layer member made of a corrosion-resistant material against corrosion components existing in the traveling environment were continuously welded to form a cylindrical muffler shell. A structure in which the inner layer member is provided only in the action region of the exhaust condensed water may be used. Mash seam welding, plasma welding, TIG welding,
Alternatively, continuous welding was performed by laser welding to form a tube. The continuous welding referred to in the present invention refers to continuous welding, unlike point welding (spot welding) in which welding is performed in a spot manner. Mash seam welding in resistance welding comparable to group welding in arc and gas welding, plasma welding, TI
G welding or laser welding is preferable because efficient automatic welding is possible.

An expensive steel plate having corrosion resistance to the corrosion components in the exhaust condensed water is used as the inner layer member A, and an outer layer member (steel plate or other metal plate) B made of a corrosion resistant material against the corrosion components existing in the traveling environment is mash seam-welded. Alternatively, they were joined to form a cylindrical shape by laser welding. When the internal corrosion of the shell occurs over the entire area, the inner layer member A of the corrosion-resistant steel plate may be used over the entire inner circumference of the shell and joined to the outer layer member B to form a cylindrical shape. In the case where only the corrosion occurs, it is not necessary to use an expensive corrosion-resistant steel plate all around. Therefore, it is possible to reduce the material cost. Further, since the inner layer member A and the outer layer member B are joined by mash seam welding, plasma welding, TIG welding, or laser welding, there is no permeation sound from a gap and no leakage of exhaust gas.

[0007]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below in detail with reference to embodiments. FIG. 1 is a sectional view of a muffler 7 shell according to the present invention, which is effective when internal corrosion of the shell occurs over the entire area, and FIG. 2 is a perspective view. A steel sheet 1 having good corrosion resistance to corrosion components in exhaust condensed water is used as an inner layer member all around the inner layer, and after being slightly overlapped at a portion shifted to the outer layer, continuous welding is performed at the welded portion P with the corrosion-resistant metal plate 6 of the outer layer member B. The mash seam is welded. Conventionally, such a seam weld P
Although it was difficult to reduce the leakage of the exhaust gas and the transmitted sound due to the absence of such a structure, such a structure eliminates these disadvantages. The vicinity of the end portions of the steel plate 1 and the corrosion-resistant metal plate 6 is fixed to the main body by the spot welds 2 to prevent chattering noise and the like and improve strength.

FIG. 3 is a sectional view of the muffler shell of the present invention, which is effective when internal corrosion of the shell occurs only on the bottom surface. A steel sheet 1 having good corrosion resistance to corrosion components in exhaust condensed water is used as a part of the inner layer, and mash seam welding is performed at the continuous welded portion P with the corrosion-resistant metal plate 6 of the outer layer member B within the circumference of the inner layer. Therefore, the outer layer member B is used more than in the above embodiment, which further contributes to a reduction in manufacturing cost.

[0009]

According to the present invention, the use of a corrosion-resistant steel plate having a high price can be reduced as much as possible, and the cost can be reduced by combining steel plates having corrosion resistance and durability on the inner and outer surfaces. In addition, transmission noise was reduced, exhaust gas leakage was prevented, and the manufacturing process was simplified.

[Brief description of the drawings]

FIG. 1 is a schematic cross-sectional view of a muffler shell of the present invention.

FIG. 2 is a perspective view of the muffler shell.

FIG. 3 is a schematic sectional view of another embodiment.

FIG. 4 is a schematic cross-sectional view of a conventional muffler shell.

FIG. 5 is a schematic sectional view of another conventional muffler shell.

FIG. 6 is a schematic sectional view of another conventional muffler shell.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Corrosion-resistant steel plate 2 Spot welding part 3 Protective cover 4 Mechanical joining part 5 Mechanical joining part 6 Corrosion-resistant metal plate 7 Muffler A Inner layer member B Outer layer member P Continuous welding part

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Claims (3)

[Claims] 1. A muffler shell formed by continuously welding an inner layer member made of a corrosion-resistant material to corrosion components in exhaust condensed water and an outer layer member made of a corrosion-resistant material to corrosion components present in a traveling environment. 2. The muffler shell according to claim 1, wherein the inner layer member is provided only in an action area of the exhaust condensed water. 3. The muffler shell according to claim 1, wherein the continuous welding of the inner layer member and the outer layer member is mash seam welding, plasma welding, TIG welding, or laser welding.