JPS6114419A - Exhaust device of internal-combustion engine for automobile - Google Patents

Abstract

PURPOSE:To unnecessitate a flange, a bolt, a nut, etc., and thereby make an exhaust system inexpensive as in low-unit cost, by coupling each of exhaust system members including an exhaust pipe, a submuffler, a catalytic converter, a main muffler, etc., as one body in regular sequence of means of welding. CONSTITUTION:Exhaust system parts for an engine E, namely, an exhaust pipe 1, a submuffler 2, a catalytic converter 3, an exhaust pipe 5, a main muffler 4, etc., are coupled tight together by means of welding W. With this constitution, a joint flange, a gasket, a bolt, a nut and so on are all made unnecessary, reducing the number of parts items, and exhaust device is thus inexpensively manufacturable.

Description

[Detailed description of the invention] B1 Purpose of the invention (Usage field of +1 industry 1-) The present invention relates to a υ1 air system for an internal combustion engine for an automobile.

[Conventional technology]

This type of exhaust system is generally configured to emit 1A of exhaust gas from an internal combustion engine through exhaust system members such as an exhaust pipe, a sub-muffler, a catalytic converter, and a main muffler.

Conventionally, in order to easily replace the above exhaust system members, each part was removably connected with a flange joint. They are provided facing each other, and a gasket or the like is sandwiched between the two flanges, and the flanges are connected with a bolt bolt 71.

[The problem that the invention attempts to solve]

Recently, however, the durability of the exhaust system components mentioned above has been extended, so fewer heavy vehicles have their exhaust system parts replaced before they are scrapped. Therefore, for many 71!1iI4s, the flanges, bolts, nuts, etc. that are used to replace the above-mentioned parts are wasted.
The weight has increased unnecessarily and the fuel consumption has increased, resulting in a loss//F.

There is also the problem that stress due to engine vibrations tends to concentrate on a portion of the flange joint.

The present invention aims to solve the conventional problems listed in I-1.

Structure of the invention [Means for solving the problem] 1: In order to achieve the objective, the invention has the following structure. That is, in an exhaust system for an internal combustion engine for an automobile, in which exhaust gas from the internal combustion engine E is first discharged through exhaust system members such as an exhaust pipe exhaust muffler 2 and a catalyst converter main muffler 4, It is characterized in that members 1 to 4 are successively and integrally connected by welding.

[Effect]

By sequentially welding adjacent exhaust system members in series and integrally connecting them like two pairs of legs, there is no need for flanges, ports, nuts, etc. for connection.

〔Example〕

In the embodiment shown in the figure, the exhaust from the internal combustion engine E mounted on the front of the vehicle is transferred to an exhaust pipe L, a submuffler 2, and a catalytic converter 3.
- It is applied to an exhaust system that discharges air to the rear of the vehicle body via the connecting exhaust pipe 5 and the main muffler 4.

The exhaust pipe 1 and the sub-muffler 2 are fixed by welding W, with the end 2a of the sub-muffler 2 tightly fitting onto the outer peripheral surface of the bleed pipe 1, as shown in FIG. 2, for example. The submuffler 2 and the catalytic converter 3, and the catalytic converter 3 and the exhaust pipe 5 are also tightly fitted inside and out at their ends and fixed by welding W in the same manner as described above.

Further, the 1y trachea 5 and the main muffler 4 are welded together by fitting a short cylindrical portion 41a formed on the end plate 41 of the muffler 4 to the outer peripheral surface of the connecting pipe 5, as shown in FIG. 3, for example.

Note that the components of the exhaust system are not limited to the illustrated example.

If it becomes necessary to replace any of the components, the front and rear parts of the component are cut, and the replacement part is connected to the cut portion and welded together.

C. Effects of the Invention Since the present invention has a two-legged configuration, it can be extremely easily integrated into one body by simply welding the exhaust pipe 1, sub-muffler 2, catalytic converter 3, and main muffler 4τ exhaust system members in sequence. , 79
°'）j'
1st class. .

Because it does not require the use of a Moreover, since the weight is reduced, fuel consumption is saved and it is economical. In addition, compared to flange joints, there is less concentration of stress at the connection part due to engine vibrations, etc., and it is more durable.

[Brief explanation of drawings]

Fig. 1 is a side view of the exhaust system of the present invention, Fig. 2 is a partially cutaway enlarged side view of its submuffler and catalytic converter, and Fig. 3 is an I-diagram of the connection between the exhaust pipe and the main muffler. . ■ is a bleed pipe, 2 is a submuffler, 3 is a catalytic converter, 4
is the main muffler, 5 is the connecting exhaust pipe, and E is the engine. ¥4 Applicant: Honda Motor Co., Ltd. f, -111, - Agent: Fuku 1)
Recommendation: ・1・:1 Go second figure 3! gJ

Claims (1)

[Claims] (1) An exhaust system that discharges exhaust gas from an internal combustion engine through exhaust system members such as an exhaust pipe, sub-muffler, catalytic converter, and main muffler, characterized in that the above-mentioned exhaust system members are sequentially and integrally connected by welding. Exhaust system for automobile internal combustion engines.