JP2569419Y2 - Automotive muffler - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a muffler for a vehicle, and more particularly to a muffler for a vehicle in which a tail pipe connected to an exhaust port for exhausting the muffler has a beautiful appearance.

[0002]

2. Description of the Related Art An example of a conventional automobile muffler will be described with reference to the drawings. FIG. 2 is an external view showing the exhaust side of a conventional automobile muffler. A tail pipe 51 is connected to a gas exhaust port 50a formed on the exhaust side of the muffler body 50.

[0003] A finisher 52 is provided on the outer periphery of the tail pipe 51, which has a glossy surface and various designs to give it a commercial function, and has a beautiful appearance. The finisher 52 is fixed by a fixing screw 53.

[0004] As a conventional example of this kind, for example,
Japanese Patent Application Laid-Open No. 4-113737 discloses a technique in which a holding bead provided in a finisher is fitted to and fixed to a tail pipe instead of the fixing screw. In the case of fixing to the tail pipe by the clamp provided on the finisher,
As disclosed in Japanese Patent No. 5930, various inventions have been made in the past to attach a finisher as an exterior member of a tail pipe to give an aesthetic appearance as described above.

[0005] Further, the tail pipe is plated to give an aesthetic appearance without using a finisher, or the tail pipe is formed of austenitic stainless steel, and its surface is mechanically polished with a buff or the like. There are those that have been configured.

[0006]

However, in the above-mentioned conventional automobile muffler, however, the finisher 52, which has been subjected to a predetermined processing on the external design, is attached as an exterior member of the tail pipe 51, so that the number of parts increases and the manufacturing cost increases. And the weight of the entire muffler increases. In the case where the finisher 52 is attached to the outer periphery of the tail pipe 51 and fixed with the fixing screws 53, there is a problem that the attaching work is troublesome and the workability is poor.

In the case where the tail pipe is plated, if the tail pipe is plated on the surface of the tail pipe and then connected to the muffler body by welding, the weldability of the plated portion is reduced. There is a problem that is bad. Further, when the tail pipe is first welded to the muffler body and connected to the tail pipe before plating, it is necessary to mask the non-plated portion, which causes a problem that the manufacturing process becomes complicated.

In the case where the tail pipe is made of austenitic stainless steel and its surface is mechanically polished with a buff or the like, the aesthetic appearance is excellent, but the polishing is troublesome and the material cost is high. There is a problem that the manufacturing cost increases.

An object of the present invention is to eliminate the need for a conventional finisher by connecting an exhaust port of a muffler to a tail pipe made of a relatively inexpensive material that is electropolished on its surface and has an aesthetic appearance. Muffler is provided. Accordingly, it is an object of the present invention to provide an automobile muffler which reduces the number of parts to reduce the manufacturing cost, reduces the weight, and further improves the working efficiency.

[0010]

According to the present invention, there is provided a muffler for an automobile in which a tail pipe formed by subjecting a stainless steel material or a steel material to an electrolytic polishing treatment is kept airtight together with an end plate or a terminal pipe constituting a muffler body. The above-mentioned problem is solved by welding and fixing.

[0011]

Since the vehicle muffler according to the present invention is constructed as described above, the tail pipe itself has an aesthetic appearance.

[0012]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a perspective view showing an embodiment of an automobile muffler according to the present invention. FIG. 1 is an explanatory cross-sectional view of the automobile muffler of the present invention.

The muffler main body 1 connected to the end of the exhaust system of the automobile has a plurality of chambers and passages therein. An exhaust port 2a is formed. The exhaust port 2
The end face a is cut on substantially the same plane as the end plate 1a surface of the muffler main body 1.

A tail pipe 3 is connected to an exhaust port 2a at the end of the end pipe 2 in the exhaust direction, and the exhaust gas whose temperature and pressure have been reduced by the muffler body 1 is:
The tail pipe 3 is discharged to the outside air from the open end 3a.

The connection end 3b, which constitutes one end of the tail pipe 3, has a size corresponding to the exhaust port 2a formed by the end of the end pipe 2, and the connection end 3b is exhausted. After fitting into the mouth 2a, the end plate 1a of the muffler main body 1, the end pipe 2 and the tail pipe 3 are integrally welded over the entire periphery of the connection portion and fixed while maintaining airtightness.

The tail pipe 3 is made of a stainless steel material or a general steel material or the like, and its surface is subjected to a surface gloss treatment including electrolytic polishing to give a beautiful appearance. As an example of the surface gloss treatment, first, the material of the tail pipe 3 is subjected to alkaline degreasing, then to chemical polishing, and to electrolytic polishing. Further, a passivation treatment is preferably performed thereafter, since the corrosion resistance is improved.

The external shape of the tail pipe 3 is formed by expanding a predetermined portion from a connection end 3b forming one end of the tail pipe 3 to an open end 3a forming the other end. This external design is designed to provide a more beautiful appearance.

Therefore, the tail pipe 3 itself has an aesthetic appearance and has a merchantability function according to the above-described configuration, so that it is not necessary to provide a finisher with an aesthetic effect as in the related art. In addition, compared to the case where the surface of the tail pipe 3 is plated, weldability is good and masking is not required, so that workability is good.

Further, the tail pipe is made of austenitic stainless steel, ferritic stainless steel, martensitic stainless steel or general steel material, and the surface is polished by electrolytic polishing, so that the processing cost is reduced, and the buff or the like is used. The manufacturing cost is lower and the surface gloss treatment can be easily performed as compared with a material that is polished.

In this embodiment, the end pipe 2 and the tail pipe 3 of the muffler main body 1 are separately formed and connected by welding. However, as another embodiment, the end pipe 2 and the tail pipe 3 are connected. It may be composed of one member and configured to protrude from the muffler body 1. Further, the outer shape of the tail pipe 3 may be variously designed to give an aesthetic appearance, and may be an expanded flapper type or a straight pipe that is not expanded. Further, the opening surface of the open end 3a of the tail pipe 3 can be formed in a circular shape, an oval shape, or the like. Furthermore, it is also possible to design by molding by means other than expansion or combining with other members.

[0021]

The vehicle muffler according to the present invention has the above-described structure and operation, so that the tailpipe itself has an aesthetic appearance, and it is not necessary to cover the finisher as in the prior art. Therefore, the manufacturing cost can be reduced by reducing the number of components constituting the muffler, and
The weight of the muffler can be reduced. Further, since the work of attaching the finisher is not required, the work efficiency is improved.

Further, compared with the method of plating the surface of the tail pipe, the workability is good because the weldability is good and the necessity of masking is unnecessary. Also, the tail pipe is made of ferritic stainless steel, martensitic stainless steel or general steel material, compared to austenitic stainless steel whose surface is mechanically polished with a buff or the like. In addition, the material cost is low and the manufacturing cost can be reduced. Further, by polishing the surface by electrolytic polishing, a large amount of tail pipes can be simultaneously polished, so that the productivity is improved, and the surface gloss treatment can be easily performed, and the workability is good.

[Brief description of the drawings]

FIG. 1 is an explanatory cross-sectional view of an automobile muffler of the present invention.

FIG. 2 is an external view of a conventional automobile muffler.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Muffler main body 1a ... End plate 2 ... End pipe 2a ... Exhaust port 3 ... Tail pipe 3a ... Open end 3b ... Connection end

Claims (1)

(57) [Scope of request for utility model registration] An automobile muffler is characterized in that a tail pipe obtained by subjecting a stainless steel material or a steel material to electrolytic polishing is welded and fixed together with an end plate or a terminal pipe constituting a muffler body so as to maintain airtightness. Muffler for automobile.