JPS59524A - Muffler - Google Patents

Abstract

PURPOSE:To facilitate the assembling operation and universalize parts, by super- imposing a plurality of bottomed cylindrical pot-shaped elements to make up a casing, and simultaneously dividing the inside of the casing into a plurality of chambers. CONSTITUTION:An inlet pipe 12 is inserted into through holes 20a-20c formed respectively at the upper pats of flat parts 15a-17a of first-third elements 15- 17. The rear end of the inlet pipe 12 is opened in a chamber 10. Both ends of a communicating pipe 14 are inserted into through holes 21a and 21b formed at the intermediate parts of the flat parts 16a and 17a of the second and third elements 16 and 17. Both ends of the communicating pipe 14 are opened in the first and third chambers 8 and 10. Further, an outlet pipe 13 is inserted into through holes 22a-22d formed at the lower parts of the plane parts 16a-18s of the second-fourth elements and the flat part 19a of the end plate 19 and the forward end of the outlet pipe 13 is opened in a first chamber 8.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an improvement in a muffler that reduces the internal energy of exhaust gas pulsatingly discharged from an internal combustion engine such as an automobile engine, and attenuates noise by regulating the pulsation. The purpose is to provide a product with a small number of parts, easy to manufacture, and parts that can be used for general purposes, making it possible to provide the product at a low price. Silencers having various structures are known. In this silencer, openings at both front and rear ends of a cylindrical body 10 are connected to end plates 2, respectively.
．． The inside of the casing 4, which is closed by a casing 4, is surrounded by three partition walls 5.6.
7 is divided into four chambers 8, 9, and 10, IIK, first to fourth, in order from the front side (left side in the drawing).

The inlet pipe 12, which is inserted into the casing 4 through the front end plate 2 in a gas-tight manner, crosses the two front chambers 8.9.
The rear end of the third chamber 10 is opened by passing through the two partition walls 5.6 in an airtight manner. In addition, the outlet pipe] 3, which is inserted into the casing 4 by passing through the rear end plate 3 airtightly, crosses the three rear chambers 9, 'l0-11, and the three partition walls 5.6. .7
The front end is opened to the -th chamber 8 which is the closest to the front by airtightly passing through the chamber. Further, both ends of the communication pipe 140 passing through the two front partition walls 5.6 open into the first chamber 8 and the third chamber 10, respectively. In addition, appropriate small holes (not shown) are bored in the portion of the six pipes 12, 13, and 14 located in the second chamber 9 and in the portion of the outlet pipe 13 located in the fourth chamber JJ. Room 9
．． 1J is used to act as a resonance chamber.

When using the silencer configured as described above to attenuate exhaust noise, the exhaust gas is sent in through the inlet pipe 12 and discharged through the outlet pipe 13, during which time the flow path expands and contracts repeatedly, causing internal damage. The second concave chamber 9.1 reduces the energy
1, the noise is attenuated and pulsated or smoothed by the resonance effect of 0. A muffler constructed and operated as described above has conventionally had a partition wall 5 inside a cylindrical body 1, as shown in FIG. .6.7 fixed by welding and 6 pipes 1 passing through each bulkhead 5.6.7
The contact portion between 2.13.14 and this bulkhead 5.6.7 is welded, and end plates 2.3 are welded to the openings at both ends of the body 10, and the edges of both ends of this body 10 and the peripheral edge of each end plate 2.30 are welded. The parts of the inlet pipe 12 passing through the end plate 20 and the part of the outlet pipe 13 passing through the end plate 30 are respectively welded. Although not shown, the fuselage 1 includes a casing 4
The body 1 vibrates due to internal noise, and in order to prevent radiated noise from propagating around the muffler, a double structure is often used.

However, in the conventional silencer assembled as described above, the bulkhead or tube is fixed at a predetermined position in the body 1, or the end plates are wrapped and fixed around the openings at both ends of the body 10. The work was troublesome. In addition, the structure and size of the silencer must vary depending on the displacement of the internal combustion engine, etc.
In the conventional silencer shown in Figure 1, there are few parts that can be used for general purposes, and it is necessary to prepare a variety of parts for each type of silencer. This caused the price to rise.

The silencer of the present invention has a casing made by stacking a plurality of bottomed cylindrical forest-like elements so that the inside of the casing is divided into a plurality of chambers, thereby simplifying assembly work and parts. The aim was to make the product more versatile and at the same time reduce the number of parts, thereby lowering the price of the product.

Hereinafter, the present invention will be explained in more detail with reference to drawings showing examples.

FIG. 2 shows the completed silencer of the present invention.

This muffler includes a plurality of (four in the illustrated example) elements 15.
16, 17, 18 and one end plate 19 are overlapped to form a casing 4 whose interior is divided into first to fourth chambers 8,9,10,11, and inside this casing 4 Inlet pipe]
2 and an outlet pipe 13 are inserted, and a communication pipe 14 is further provided. Each element 15 to 18 is formed by press forming a steel plate, and is formed in a forest shape with cylindrical vertical walls 1.5 b to 18 b provided at the peripheral edge of a flat plate part 158 to 18 a. The elements 15 to 18 are formed so that the cross-sectional area and cross-sectional shape are the same size K, and each vertical wall 15b~]
The end of 8b is slightly expanded in diameter to form large diameter portions 15c to 18c, and the flat plate side end of the adjacent element or end plate 19 is placed within this large diameter portion 1.5c to 18c. This allows for easy mating. This end plate 19 has a relatively low vertical wall 1'9b formed at the peripheral edge of a flat plate part 19a of the same size as the flat plate part of each element, and the vertical wall 19b is located near the rearmost element 180.
It fits into the large diameter portion 18c without play. In addition, one or more through holes are formed in the flat plate parts 15 a to 18 a and the end plate 19 of each element 15 to 18, and by inserting and fixing an appropriate pipe into each of the through holes, the muffler can be operated. It consists of That is, the flat plate portions 1.5 a to 1 of the first to third elements 15 to 17
The artificial tube j2 is inserted into the through holes 20a to 20cK, which are respectively drilled in the upper part of 7a (lower -L is according to the drawing).
The rear end of this inlet pipe 12 opens into the third chamber 10. Further, both ends of a communication pipe 140 are inserted into through holes 21a and 21bK bored in the intermediate portions of the flat plate portions 16as17a of the second and third elements 16.17, respectively. Furthermore, the flat plate portions 16a to 18 of the second to fourth elements 16 to 18 open to the three chambers 8 and 10, respectively.
The outlet pipe 13 is inserted into the through holes 223 to 22d bored in the lower part of the flat plate part 19a of the end plate 19, and the front end of the outlet pipe I3 opens into the -th chamber 8.

Next, a procedure for assembling the silencer of the present invention configured as described above will be explained.

To assemble the silencer, first insert the inlet pipe 12 by a predetermined length into the through hole 20a of the flat plate part 15a of the first element 15 as shown in FIG. The pipe 12 and the flat plate portion 15a are welded and joined.

Next, as shown in FIG. 4, the flat plate portion 1 of the second element 16 is
While inserting the artificial tube 12 into the upper through hole 20b of 6a, the front end of this second element 16 is fitted into the large diameter part 15CK of the rear end of the first element 15, and the flat plate of this second element 16 is inserted. The front end of the communication pipe 14 is inserted into the through hole 2 in the middle part of the section 16a, and the front end of the outlet pipe 13 in the lower part is inserted into the through hole 22a, and the first and second elements 151.16 are brought into contact with each other. The pixel element 15.1 is welded (seam welded around the entire circumference or spot welded after applying a sealer).
．． 6 is airtightly joined, and the flat plate portion 16a and the above 6
Weld pipes 12, 13, and 14. Next, as shown in FIG.
0 c K Inlet pipe] Connect the rear end of 2 to the through hole 2J in the middle part.
, b Insert the rear ends of the K communication pipes 14 and further insert the lower through hole 22bVc outlet pipe 13, and insert the front end of the third element 17 into the rear end of the second element 16 indicated by -L. The large diameter portion 16cK is fitted into the large diameter portion 16cK, and the joint portion of the pixel element 16.1.7 and the insertion portion of the six tubes 12.13.14 are welded. Furthermore, as shown in FIG. 6, while inserting the through hole 22'c K outlet pipe 13 in the lower part of the flat plate part]8'a of the fourth element 18, the front end of the fourth element 18 is inserted into the third element. 17, and weld the joint portion of the pixel elements 1, 7, and 18 to the penetrating portion of the outlet tube 13. Finally, the end plate 19 is fitted into the rear end opening of the fourth element 18 while inserting the rear end of the outlet pipe 13 in the through hole 22dK of the flat plate part 19a, and the large diameter part 18c of the fourth element 180 is fitted. and the standing wall 19b of the end plate 19, and the outlet pipe 130 penetration part is welded to form the second
The silencer is completed as shown in the figure.

The function of the silencer of the present invention constructed and assembled as described above is the same as that of the conventional silencer shown in FIG. 1, so a description of the function will be omitted. Since the silencer can be constructed and assembled in different ways, it is easy to assemble each part, and many of the parts can be reused even when manufacturing different types of silencers, and many types of manufacturing equipment can be prepared to manufacture many types of parts. becomes unnecessary. That is, if the heights of the standing walls of each element are made different, it is possible to create many different types of silencers simply by changing the way they are combined, and even more types of silencers can be obtained by changing the number of combinations. Furthermore, since the joint portion of the casing 4 formed by joining each element has a double structure and functions as a reinforcing frame for the peripheral wall of the casing, there is no need to make the peripheral wall of the casing 40 a double structure. The number can also be reduced.

As described above, the silencer of the present invention plays a significant role in reducing manufacturing costs by facilitating assembly, making parts more versatile, and reducing the number of parts.

In the illustrated embodiment, a four-chamber silencer has been described, but there is no particular limitation as long as the number of chambers is two or more, and the position where the end plate 19 is provided is not limited to the rear side, but can also be placed on the front side. Of course, this is a good thing.Furthermore, the flat plate portion of some of the elements can be made into a perforated plate shape so that the exhaust gas can flow through the flat plate portion.

[Brief explanation of drawings]

Fig. 1 is a sectional view schematically showing a conventional muffler, Fig. 2 is a sectional view schematically showing a muffler of the present invention, and Figs. FIG. 1: Body, 2.3: End plate, 4: Casing, 5.6.7
: Partition, 8: Second chamber, 9: Second chamber, 10: Third chamber, 11
: Fourth chamber, 12: Inlet pipe, 13: Outlet pipe, 14: Communication pipe, 15.16.17, j8: Element, 158% 16a1
17a-i 18a: flat plate portion, 15b, 16b. 17b, +8b: Standing wall, 15 C% 16 c -, 1
7c, 1.8c: Large diameter part, 19: End plate, 19a
: Flat plate part, 19b: Standing wall, 20a, b, c: Through hole, 21
a, b: Through hole, 22a1b, C, d: Through hole〇 Patent applicant: Japan Radiator Co., Ltd. Agent
Figure 1 Figure 2

Claims (1)

[Claims] A cylindrical standing wall is formed on the peripheral edge of a flat plate portion in which one or more through holes are bored, and the diameter of this standing wall is enlarged by the thickness of the plate at the end of the plurality of elements to form a large diameter part. The flat plate part side end of another element is fitted into the diameter part and joined together, and the opening of the element at one end is a vertical wall of the end plate that forms a low vertical wall around the flat plate part with a through hole. A casing whose inside is divided into a plurality of chambers is formed by fitting inside the diameter part, and the inlet pipe and outlet pipe are inserted through each of the above-mentioned through holes into the casing, and the insertion side ends of both pipes are inserted into the casing. A silencer that communicates through a gas flow path provided in the.