JPS5943463Y2 - exhaust silencer - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a low-cost and lightweight exhaust muffler made of sheet metal.

Conventionally, in sheet metal exhaust silencers used for internal combustion engines, etc., the main body part and the nirbow part that sucks exhaust gas from the exhaust port of the internal combustion engine are press-formed separately, and then they are fully welded. In this case, there are many welded parts, which not only increases manufacturing costs, but also risks the occurrence of problems such as gas leaks.Also, the number of component parts is large, which increases the cost. It has the drawbacks of being tall and heavy.

Therefore, the present invention was devised to eliminate the above-mentioned conventional drawbacks, and the object is to provide a low-cost, lightweight exhaust silencer made of sheet metal that can reduce the number of welding points and the number of assembly steps. This is the purpose.

That is, the present invention provides a sheet metal exhaust silencer installed in an engine, in which the exhaust silencer is vertically divided into two parts, an engine side member and an anti-engine side member, and the anti-engine side member is divided into two parts. At the same time, only the flat bent and punched parts are formed on the engine side member, and the main body part and the exhaust gas introduction side nirbow part of each member are integrally formed, and further, It is constructed by forming the tail pipe on the exhaust gas discharge side of the exhaust silencer by press molding and fixing it to the engine side member.

Embodiments of the present invention will be described below with reference to the drawings.

The exhaust silencer 1 for an internal combustion engine according to the embodiment of the present invention shown in FIGS. 1 and 2 consists of a main body portion shown by one person in FIG. The main body portion 1A and the nirbow portion 1B are integrally press-molded.

During the press forming described above, this exhaust silencer 1 is manufactured by vertically dividing into two parts, an engine-side member indicated by arrow A in Fig. 1 and an anti-engine-side member indicated by arrow B. The engine-side member indicated by A is only subjected to flat plate bending and punching, whereas the anti-engine-side member indicated by B is a part of the Nirbo from the exhaust inlet 2 that introduces the exhaust gas E from the exhaust port of the engine. In order to form the gas passage 3 of 1B and the main part of the main body part 1A, it is formed by drawing.

In addition, in the exhaust silencer 1 of this embodiment, since the protrusion length of the main body part IAt from the part that is attached to the engine through the manosy mounting bolt hole 4 is large, the plate thickness of the engine side member indicated by arrow A is indicated by arrow B. It is made thicker than the anti-engine side member to ensure strength.

One by one, compartments 5A, 5B, and 5C are placed in the main body.

As shown in FIG. 1, the partition wall 6 configuring the partition wall 5D is made by drilling a plurality of small holes 6A and then attaching the second wall by welding or caulking.
As shown in the figure, it is fixed to the anti-engine side member B of the main body portion 1A.

In addition, the tail pipe γ installed internally on the exhaust gas E discharge side of the exhaust silencer 1 is also formed by press molding of sheet metal with small holes 7A, and is fixed to the engine side member shown by arrow A by spot welding. After that, the engine side member A and the anti-engine side member B, which are divided into two parts, are assembled by welding at their divided flange portions 8.

Next, in the above-mentioned exhaust silencer 1, the exhaust gas E introduced from the exhaust inlet 2 is passed through the gas passage 3 from the compartment 5A to the compartments 5B, 5C, and 5D in order, and is passed through the small holes in each partition 6. 6A, the flow of the exhaust gas E is restricted, and finally it is discharged to the outside through the tail pipe I from the small hole 7A.

As mentioned above, in the exhaust silencer of the present invention, the drawn part is formed only on the member on the side opposite to the engine, and only the flat bent and punched part is formed on the engine side member. The parts can be used almost flat,
Therefore, a member having an appropriate thickness can be freely used depending on the required strength.

Therefore, the engine-side member can easily and reliably support the non-engine-side member on which the drawn portion is formed and the tail pipe on the exhaust gas discharge side.

In addition, in the exhaust silencer of the present invention, the main body part and the nirbow part of both the engine side member and the anti-engine side member are integrally molded, so the number of parts is reduced and the number of welding points can be reduced. , which is advantageous in terms of cost.

Further, since the tail pipe provided on the exhaust gas discharge side is also a press-molded product, it can be manufactured lightweight and inexpensively, and it is easy to fix to and support by the engine side member.

In the past, the exhaust muffler of the present invention is formed by vertically dividing into two parts, the engine # member and the anti-engine side member, so the split flange formed around the entire circumference of the exhaust muffler forms a lip structure. As a result, the rigidity and strength can be increased, and reinforcement such as ribs becomes unnecessary.

Therefore, it is possible to reduce the weight, and when press-forming the main body part, etc., it is possible to simultaneously drill bolt holes for mounting the safety cover and muffler in the 7-part flange part, which reduces the manufacturing cost accordingly. There is also the advantage of being able to

Furthermore, with the exhaust silencer of the present invention, the shape of the exhaust silencer can be determined along the outer surface of the engine, so space can be saved and the entire engine equipped with the exhaust silencer can be shaped. It has the advantage of being compact.

Note that the present invention can be effectively applied as an exhaust muffler used in various engines such as internal combustion engines.

[Brief explanation of the drawing]

FIG. 1 is a plan sectional view of an exhaust muffler according to an embodiment of the present invention, and FIG. 2 is a side sectional view of the exhaust muffler of FIG. 1. 1...Exhaust silencer, 1A...Body part, 1B...Nirbo part, 2...Exhaust inlet, 6...Bulkhead , I... tail tube, A
...Engine side member, B...Anti-engine side member, E...Exhaust gas.

Claims (1)

[Scope of utility model registration request] In a sheet metal exhaust silencer installed in an engine, the exhaust silencer is vertically divided into two parts, an engine side member and an anti-engine side member, and a drawing part is formed only on the anti-engine side member. At the same time, only a flat plate bending and punching part is formed on the engine side member, and the main body part and the exhaust gas introduction side nirbow part of each member are integrally molded,
Furthermore, an exhaust muffler is formed by press molding a tail pipe on the exhaust gas discharge side of the exhaust muffler and fixed to an engine side member.