JPS603304Y2 - 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 an exhaust silencer made of sheet metal, in which the exhaust silencer is vertically divided into two halves, and the main body part and the exhaust gas introduction side nirbow part are integrally molded. A plurality of caulking grooves for holding the partition wall are formed at intervals in the vertical direction on the inner wall surface of the part, and in the grooves,
Each of the partition walls has a plurality of small holes for passing the exhaust gas, and further has a gas discharge port at the upper end for discharging the exhaust gas to the outside in a direction opposite to the flow direction of the exhaust gas flowing through the main body, and It is constructed by inserting a cylindrical pipe member, the lower end of which communicates with the lower part of the main body portion through a plurality of small holes, through the partition wall in the vertical direction of the main body portion.

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

First, an exhaust muffler 1 for an internal combustion engine according to an embodiment of the present invention shown in FIGS. 1 and 2 has a main body portion shown as IA in FIG. The main body portion IA and the nirbow portion IB are integrally press-molded.

During the press molding described above, this exhaust silencer 1 is manufactured by vertically dividing into two parts, and the engine mounting side part IB shown by arrow A in FIG. 1 is the exhaust port of the internal combustion engine (not shown). It has a gasket surface (indicated by arrow G) for attachment to the plate, and has a flat bottom shape.

Further, the exhaust gas passage indicated by the arrow E of the Nirbow portion 1B is formed by pressing the Nirbow portion IB on the anti-engine side, indicated by the arrow B, into a bottom shape.

Next, in the main body portion IA, a partition wall 3 having a plurality of small holes is formed.
A cylindrical pipe member 5 is formed by forming a plurality of retaining caulking grooves 4 during press molding, and is fitted into holes provided in a plurality of partition walls 3 by welding or press fitting in advance,
The exhaust silencer 1 is assembled by being inserted in the vertical direction of the main body portion IA, and at that time, each partition wall 3 is fitted into the caulking groove 4 and positioned.

A plurality of small holes are formed in the lower end of the cylindrical pipe member 5 inserted into the main body part 1, and a gas exhaust port 6 is provided in the upper end opening that projects from the main part 1A to the outside. .

To explain the flow of the exhaust gas E in the exhaust silencer 1 configured in this way, the exhaust gas E introduced from the exhaust port of the internal combustion engine via the exhaust introduction lower flows through the upper part formed by the partition wall 3 of the main body portion IA. From compartment 8A to each compartment 8B, 8C,
The flow of exhaust gas E flows in the order of 8D, but after the flow of exhaust gas E is throttled and muffled by the plurality of small holes provided in the partition wall 3, a cylindrical pipe is inserted from the partition 8D in the vertical direction of the main body portion IA. Each compartment 8A, 8
The exhaust gaffs flowing through B, 8C, and 8D flow in the opposite direction to the flow of E and are discharged from the gas outlet 6 to the outside.

The divided flange portion 9 of the two-divided exhaust muffler 1 is provided with muffler mounting bolt holes 10 and the like.

As described above, the exhaust muffler of the present invention is an exhaust muffler made of silver and gold, in which the muffler is vertically divided into two parts, and the main body part and the exhaust gas introduction side nirbow part are integrated. At the same time, a plurality of caulking grooves for holding the partition wall are formed at intervals in the vertical direction on the inner wall surface of the main body portion, and a partition wall is provided with a plurality of small holes for passing exhaust gas in the grooves. The upper end has a gas exhaust port for discharging the exhaust gas to the outside in a direction opposite to the flow direction of the exhaust gas flowing through the main body, and the lower end is connected to the lower part of the main body through a plurality of small holes. The cylindrical pipe member that communicates with the main body is inserted through the bulkhead in the vertical direction of the main body, so that the exhaust gas introduced into the exhaust silencer is controlled by its flow through the multiple small holes provided in the bulkhead. After being squeezed and muffled, when entering the cylindrical pipe member from the bottom of the main body part, it is squeezed and muffled through the small hole at the lower end, and
Since noise can be further reduced by the interference of pressure waves within the cylindrical pipe member, the silencing efficiency can be significantly increased.

In particular, with the exhaust muffler of the present invention, although the size of the exhaust muffler itself is small, the length of the pipe section of the cylindrical pipe member can be increased, reducing noise by interference of pressure waves. Therefore, the silencing efficiency of the exhaust muffler can be increased, and the structure can be made very simple.

Further, in the exhaust muffler of the present invention, since the main body portion and the nirbow portion are integrally molded, the number of parts and welding points can be reduced, which is advantageous in terms of cost.

In addition, since the exhaust muffler of the present invention is formed by vertically dividing into two parts, the divided flange formed around the entire circumference of the exhaust muffler forms a rib structure, which increases rigidity and strength. Since the height can be increased, reinforcement such as ribs is not required.

Therefore, weight reduction can be achieved, and bolt holes for attaching the safety cover and muffler can be simultaneously drilled in the split flange part when press-forming the main body part, etc., so manufacturing costs can be reduced accordingly. It also has the advantage of being able to

Furthermore, since the partition wall is held in the caulking groove on the inner wall surface of the main body portion, welding is not necessary and assembly is easy.

Note that the present invention can be effectively applied as an exhaust muffler used in various 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, IA... Main body part, IB...
Nirbow part, 3... Partition wall, 4... Caulking groove part, 5
... Cylindrical pipe member, 6... Gas discharge port, 7...
Exhaust inlet, E...Exhaust gas.

Claims (1)

[Scope of utility model registration request] In an exhaust silencer made of sheet metal, the exhaust silencer is vertically divided into two parts, and the main body part and the exhaust gas introduction side nirbow part are integrally molded, and on the inner wall surface of the main body part, A plurality of caulking grooves for holding the partition walls are formed at intervals in the vertical direction, each of the partition walls having a plurality of small holes for passing exhaust gas is held in the grooves, and the exhaust gas flowing through the main body of the partition wall is held in the grooves. A cylindrical pipe member having a gas outlet at the upper end for discharging exhaust gas to the outside in a direction opposite to the gas flow direction and whose lower end communicates with the lower part of the main body portion through a plurality of small holes is inserted through the partition wall. An exhaust silencer that is inserted into the main body in the vertical direction.