JP2000240443A - Muffler - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a muffler to be manufactured without varying existing production equipment and a manufacture line when capacity is increased and muffling performance of the muffler is improved. SOLUTION: This muffler is featured that a plurality of cylinder bodies 1 and 49 having a fixed length or less aye intercoupled to form an outer cylinder. Further, it is featured that a plurality of mufflers having a cylinder body, in which an exhaust pipe is inserted, and having a fixed length or less are intercoupled. Moreover, the muffler is formed that an exhaust pipe is inserted in an outer cylinder where a plurality of the cylinder bodies are intercoupled.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a muffler mounted on a vehicle exhaust system.

[0002]

2. Description of the Related Art In order to reduce exhaust noise during vehicle running,
Conventionally, silencers have been installed in the vehicle exhaust system. Based on the required capacity to satisfy the required performance (noise level, pressure loss, weight, vehicle mounting, cost) for the exhaust system, existing production facilities and A cross section is selected from a so-called standard silencer in consideration of a production line, and a standard length less than a certain length is used.

[0003] Generally, the performance of the silencer largely depends on the capacity, and depending on the vehicle, a silencer having a capacity exceeding the standard silencer may be required. In order to increase the capacity of the silencer, a method of enlarging the cross-sectional shape of the outer cylinder of the silencer or making it longer in the longitudinal direction can be considered, but since the space under the floor of the vehicle is limited, the capacity is reduced. In order to increase the noise, it is necessary to extend the outer cylinder in the longitudinal direction and lengthen the muffler.

[0004]

However, in the case where the outer cylinder is lengthened in this way, it often does not follow the equipment specifications up to now, so that new installation of production equipment and significant remodeling of the production line are required. It costs a lot of money. And if it leads to mass production and mass equipment, it is possible to construct new production equipment or significantly remodel the production line. As the muffler becomes longer, the exhaust pipe (exhaust introduction pipe, exhaust exhaust pipe, etc.) inserted into the muffler becomes longer, but it is difficult to process a small-diameter, long pipe. That is the fact.

[0005] As disclosed in Japanese Utility Model Laid-Open No. 5-96429, a vehicle exhaust system in which a plurality of mufflers are connected by an exhaust pipe has been known, but in such a conventional example,
Due to the layout with other equipment installed under the floor, it is necessary to bend the exhaust pipe three-dimensionally and connect the exhaust pipe to multiple mufflers, which causes cost and trouble. there were.

The present invention has been devised in view of the above circumstances. In order to improve the silencing performance of a silencer by increasing the capacity, a silencer that can be manufactured without changing existing production facilities and production lines is proposed. The purpose is to provide.

[0007]

In order to achieve the above object, a muffler according to a first aspect of the present invention is characterized in that an outer cylinder is formed by connecting a plurality of cylinders having a predetermined length or less. And

[0008] The invention according to claim 2 is based on claim 1.
The muffler according to claim 3, wherein a plurality of mufflers each having a length equal to or less than a predetermined length and having an exhaust pipe inserted into the cylinder are connected to each other. In this case, an exhaust pipe is inserted into an outer cylinder connecting a plurality of cylinders.

(Function) According to the muffler according to the first aspect,
By connecting a plurality of cylinders, a silencer having a long outer cylinder is manufactured, and as a result, the capacity of the silencer is increased and the silencing performance is improved. According to the second aspect of the present invention, a plurality of silencers having a length equal to or less than a predetermined length are connected, and according to the third aspect of the present invention, exhaust gas is discharged into an outer cylinder connecting a plurality of cylindrical bodies. By inserting the tube, a long silencer having an increased capacity is manufactured.

[0010]

Embodiments of the present invention will be described below in detail with reference to the drawings. FIG. 1 (a) is a conventional standard silencer using a cylindrical body (outer cylinder) having a length equal to or less than a predetermined length manufactured on an existing manufacturing line, and FIG. 1 (b) is a second example of claims 1 and 2. 1A shows a silencer according to one embodiment, in which 1 is a cylindrical body having a circular cross section whose both ends are closed by end plates 3 and 5, and the inside of the cylindrical body 1 has three baffle plates. 7, 9,
11, four chambers, namely, a first chamber 13, a second chamber 15, a third chamber 17, and a fourth chamber 19 are defined from the upstream end plate 3 side.

One end of the exhaust plate 21 is inserted into the end plate 3 through the baffle plates 7 and 9, and the end on the insertion side opens into the third chamber 17. A large number of small holes 23 are formed in the peripheral wall passing through the one chamber 13.
Are drilled. In addition, one exhaust outlet pipe 25 is inserted into the downstream end plate 5 through the baffle plates 7, 9, 11, and the insertion end of the exhaust outlet pipe 25 is the first chamber. 13 and the second chamber 15
A number of small holes 27 are formed in the peripheral wall penetrating through.

Further, a communication pipe 29 for communicating the third chamber 17 and the fourth chamber 19 is coaxially inserted into the baffle plate 11 and the exhaust introduction pipe 21.
Two communication pipes 33 and 35 having a large number of small holes 31 formed in a peripheral wall penetrating the third chamber 17 are inserted into the first and third chambers 13 and 19 and communicate with the first and second chambers 9 and 11. And the second room 1
5 is filled with a sound absorbing material (glass wool) 37,
With such a configuration, the first chamber 13, the third chamber 17, and the fourth chamber 19 function as expansion chambers, and the noise absorption of the sound absorbing material 37 of the second chamber 15 can mitigate exhaust noise. I have.

Although the conventional silencer 39 is configured as described above, a silencer having a capacity exceeding the standard silencer may be required in order to satisfy the required performance according to the vehicle, as described above. . Therefore, as shown in FIG. 1B, the silencer 41 according to the present embodiment includes, in addition to the silencer 39, a sound-absorbing standard silencer 43 having a length equal to or less than a certain length manufactured on an existing manufacturing line. The direct connection improves the silencing performance.

The silencer 43 has a cylindrical body (outer cylinder) 49 having a circular cross section whose both ends are closed by end plates 45 and 47.
A sound-absorbing material (glass wool) 51 is filled therein, and a single perforated pipe 55 having a number of small holes 53 is inserted into the center of the cylindrical body 49 through the end plates 45 and 47. It is configured. Note that the cylinder 49 has a smaller diameter than the cylinder 1 of the silencer 39.

Then, as shown in FIG.
5 and the perforated pipe 55 are arranged coaxially, and the outer periphery of the end plate 45 of the muffler 43 is welded to the end plate 5 of the muffler 39 to form the muffler 41 according to the present embodiment. The end of the exhaust outlet pipe 25 and the connection end of the perforated pipe 55 have a structure in which they are abutted. The welding operation of the muffler 43 and the muffler 39 is performed by each muffler 3.
This is performed after manufacturing 9,43.

Since the silencer 41 according to the present embodiment is configured as described above, the first chamber 13, the third chamber 17, and the fourth
In addition to the extended damping effect in the chamber 19 and the sound absorbing effect of the sound absorbing material 37, the sound absorbing effect of the sound absorbing material 51 in the noise suppressor 43 can mitigate the exhaust noise. Exhaust noise can be more reliably reduced as compared with the case of mounting.

As described above, according to the present embodiment, the noise reduction performance is improved as compared with the case where the noise reduction device 39 is simply mounted on the vehicle exhaust system, and the required performance of higher quality can be satisfied. The present embodiment has a structure in which silencers 39 and 43 of a certain length or less manufactured on an existing manufacturing line are connected, so that the product specifications are within the range of the production equipment specifications of the silencers 39 and 43.

For this reason, when manufacturing a long silencer with the aim of improving the silencing performance, it is not necessary to increase the number of new parts, and it is not necessary to install new equipment or modify an existing production line, and it is also necessary to manufacture a long silencer. It has excellent advantages such as no need for processing small diameter pipes. In addition, in the present embodiment, after the silencers 39 and 43 are manufactured in each of the manufacturing lines, it is necessary to perform an operation of welding and connecting the silencers 39 and 43. However, the exhaust pipe may be bent three-dimensionally. The workability is better than that of the conventional example in which a plurality of silencers are connected, and the cost can be reduced.

FIG. 2A shows the conventional standard silencer described above, and FIG. 2B shows the silencer according to the second embodiment of the first and second aspects. The same components as those in the above embodiment will be denoted by the same reference numerals. As described above, in order to satisfy the required performance according to the vehicle, the capacity of the expansion chamber in the silencer 39 is increased to enhance the expansion attenuation function of the exhaust noise, and at the same time, to enhance the sound absorption function of the sound absorbing material. May be required.

Therefore, as shown in FIG. 2B, the silencer 57 according to the present embodiment uses the cylinder 1, the end plates 3 and 5, the baffle plates 7 and 11 of the silencer 39, and the like. A silencer 59 having a different internal structure from that of the silencer 39 is newly formed, and the existing silencer 61 of a certain length or less is connected to the silencer 59 to improve the silencing performance. It is.

The silencer 59 closes both ends of the cylindrical body 1 with end plates 3 and 5 and partitions the inside thereof with two baffle plates 7 and 11 to form a first muffler from the upstream end plate 3 side. Three chambers, namely, a chamber 13, a second chamber 63, and a third chamber 65 are defined, and the first chamber 13 and the third chamber 6 are formed.
5 has the same capacity as the first chamber 13 and the fourth chamber 19 of the silencer 39, respectively, and the second chamber 15 and the third chamber 17 of the silencer 39.
And the capacity of the second chamber 63 of the silencer 59 are set to be the same.

Then, as shown in FIG. 2 (b), the exhaust plate 2 extends through the end plate 3 through the baffle plate 7.
1 is inserted, and its insertion side end is open to the second chamber 63, and a number of small holes 23 are formed in the peripheral wall passing through the first chamber 13.
Are drilled. Further, the exhaust end pipe 6 penetrates through the baffle plates 7 and 11 to the end plate 5 on the downstream side.
The exhaust outlet pipe 67 has an insertion-side end opening to the first chamber 13.

Further, a communication pipe 29 for communicating the second chamber 63 and the third chamber 65 is inserted into the baffle plate 11 coaxially with the exhaust gas introduction pipe 21.
The first chamber 13 communicates with the third chamber 65 between
A plurality of small holes 69 are formed in a peripheral wall penetrating the chamber 61.
The communication pipes 71 and 73 of the book are inserted, and the first chamber 13, the second chamber 63, and the third chamber 65 each function as an expansion chamber by such a configuration.

In order to enhance the sound absorbing effect of the sound absorbing material as compared with the silencer 39, the present embodiment employs the silencer 59 described above.
In addition, the sound absorbing performance is improved by directly connecting a standard sound absorbing type silencer 61 having a length equal to or less than a predetermined length manufactured by an existing manufacturing line. In the silencer 61, a large amount of the sound absorbing material 81 is filled in a cylindrical body (outer cylinder) 79 having a circular cross section whose both end openings are closed by end plates 75 and 77 than the sound absorbing material 37 of the silencer 39. One perforated pipe 85 in which the small holes 83 are formed is attached to the end plate 7.
5 and 77 are inserted into the center of the cylinder 79. The cylinder 79 has a smaller diameter than the cylinder 1 of the silencer 59.

Then, as shown in FIG.
7 and the perforated pipe 85 are arranged coaxially, and the outer periphery of the end plate 75 of the muffler 61 is welded to the end plate 5 of the muffler 59 to form the muffler 57 according to the present embodiment. The connection end portion between the exhaust outlet pipe 67 and the perforated pipe 85 has a structure in which they are abutted. And silencer 5
The welding operation of the silencer 9 and the silencer 61 is performed after the silencers 59 and 61 are manufactured in the respective production lines.

Since the silencer 57 according to the present embodiment is constructed as described above, the first chamber 13, the second chamber 63 and the third chamber
Exhaust noise is silenced by the extended damping action in the chamber 65 and the sound absorbing action by the sound absorbing material 81. As a result, exhaust noise can be more reliably reduced as compared to the case where only the silencer 39 is mounted on the vehicle exhaust system. Will be done. As described above, also with the silencer 57 according to the present embodiment, the silencing performance is improved as compared with the silencer 39, and the required performance of higher quality can be satisfied.
In addition, the present embodiment has a structure in which the silencer 59 manufactured by using the cylinder 1 of the existing silencer 39 and the silencer 61 which is a standard silencer are connected. Product specifications.

For this reason, in manufacturing a silencer having a long outer cylinder for the purpose of improving the silencing performance, the present embodiment also has an excellent advantage that, for example, it is not necessary to install new equipment or modify an existing production line. Having. Also, in this embodiment, the silencer 5
After manufacturing 9, 61, it is necessary to weld them, but the workability is higher than the conventional example in which the exhaust pipe is three-dimensionally bent or the exhaust pipe is connected to a plurality of mufflers. Well, it is possible to keep costs low.

FIG. 3 (a) is a conventional standard silencer using a cylinder (outer cylinder) having a length less than a predetermined length manufactured on an existing manufacturing line, and FIG. 3 (b) is claims 1 and 2. 3 shows a silencer according to an embodiment of the present invention. In FIG. 3A, reference numeral 87 denotes a cylindrical body (outer cylinder) having a circular cross section whose both ends are closed by end plates 89 and 91. Is three baffle plates 9
3, 95, 97, the upstream end plate 89
From the side, the first room 99, the second room 101, the third room 103, the fourth room
Four chambers 105 are defined, and each of these chambers has a larger capacity than each of the expansion chambers in the muffler 127.

The end plate 89 penetrates through the baffle plates 93 and 95 to form one exhaust introduction pipe 107.
Is inserted into the third chamber 103, and a large number of small holes 109 and 111 are formed in the peripheral wall passing through the first chamber 99 and the second chamber 101. I have.
The downstream end plate 91 passes through one baffle plate 93, 95, 97 and has one exhaust outlet pipe 11.
The exhaust outlet pipe 113 has an insertion-side end opening into the first chamber 99, and has a number of small holes 115, formed in its peripheral wall located in the first chamber 99 and the second chamber 101. 117
Are drilled.

Further, a communication pipe 119 for communicating the third chamber 103 and the fourth chamber 105 is inserted into the baffle plate 97 coaxially with the exhaust introduction pipe 107, and is connected to the baffle plates 93, 95, 97. , A communication pipe 12 that communicates the first chamber 99 and the fourth chamber 105 and has a number of small holes 121 and 123 formed in the peripheral wall located in the second chamber 101 and the third chamber 103.
5 is inserted, and the first chamber 99,
The second room 101, the third room 103, and the fourth room 105 each function as an expansion room.

Although the conventional silencer 127 is configured as described above, in order to satisfy the required performance according to the vehicle as described above, the capacity of the expansion chamber in the silencer 127 is increased to increase the exhaust noise. There may be a need for a silencer with enhanced damping. Therefore, as shown in FIG. 3B, the silencer 129 according to the present embodiment has two cylinders (outer cylinders) 131, 1 having the same diameter as the cylinder 87 and manufactured on an existing production line.
33 are directly connected to each other to form an outer cylinder 135.

The opening of both ends of one cylindrical body 131 is closed by end plates 89 and 91, and the interior of the first cylindrical body 131 and the second chamber 13 is formed by a single baffle plate 93.
Nine chambers are defined. One exhaust pipe 141 is inserted between the end plates 89 and 91 through the baffle plate 93, and the first chamber 1
37 and a large number of small holes 1 in its peripheral wall passing through the second chamber 139.
43, 145 are drilled.

The downstream end plate 91 includes:
Two exhaust pipes 14 whose insertion side ends open to the first chamber 137
7, 149 are inserted through the baffle plate 93, and the exhaust pipe 147 has a number of small holes 151, 153 formed in the peripheral wall located in the first chamber 137 and the second chamber 139.
The exhaust pipe 149 has a large number of small holes 155 formed in a peripheral wall located in the second chamber 139.

On the other hand, both ends of the cylindrical body 133 are similarly closed by end plates 89 and 91, and two chambers, a third chamber 157 and a second chamber 159, are partitioned by one baffle plate 97. The compartment is formed. A baffle plate 97 is provided between the end plates 89 and 91.
, One exhaust pipe 161 is inserted coaxially with the exhaust pipe 147, and the exhaust pipe 1
One short exhaust pipe 163 is inserted coaxially with 41, and one exhaust pipe 165 is inserted coaxially with the exhaust pipe 149 through the baffle plate 97.
A number of small holes 167 are formed in the peripheral wall of the exhaust pipe 165 located in the chamber 157.

Further, a communication pipe 169 communicating the third chamber 157 and the fourth chamber 159 is inserted coaxially with the exhaust pipe 163 in the baffle plate 97. And FIG.
As shown in (b), the silencer 129 according to the present embodiment includes exhaust pipes 141 and 163, exhaust pipes 149 and 165, and
The connecting ends of the exhaust pipes 147 and 161 are respectively butted,
The end plate 91 on the cylindrical body 131 side and the end plate 89 on the cylindrical body 133 side are directly welded, and the exhaust pipes 141 and 163 function as exhaust gas introduction pipes, and the exhaust gas introduction pipes 147 and 161 are formed. The first chamber 137, the second chamber 139, and the third chamber 15 function as an exhaust outlet pipe.
Each of the seventh and fourth chambers 159 functions as an expansion chamber.

Since the present embodiment is configured as described above, the first chamber 137, the second chamber 139, the third chamber 157, the fourth
Although the exhaust noise is reduced by the expansion damping action in the chamber 159, since the capacity of each expansion chamber is larger than that of the muffler 127, the exhaust noise can be more reliably reduced. As described above, also with the silencer 129 according to the present embodiment, the silencing performance can be improved as compared with the case where the silencer 127 is simply attached to the vehicle exhaust system, and the required performance of higher quality can be satisfied. In the present embodiment, the cylinders 131 and 133 manufactured on the existing manufacturing line are connected to the baffle plate 8.
Since the structure is directly connected via the components 9, 91, the product specifications are within the range of the existing production equipment specifications.

For this reason, when manufacturing a long silencer with the aim of improving the silencing performance, the present embodiment also has an excellent advantage such that it is not necessary to newly install equipment or modify an existing production line. Also in this embodiment, the workability is better and the cost can be reduced as compared with the conventional example in which the exhaust pipe is three-dimensionally bent or the exhaust pipe is connected to a plurality of mufflers.

Note that, in the embodiment shown in FIG.
Exhaust outlet pipes 41, 147, 161 inside 31, 133 respectively
The baffle plates 93 and 97 and the end plate 8
After being inserted through 9, 91, both cylinders 131, 133 were connected, but without using end plates 89, 91, cylinders 131, 133 manufactured on an existing manufacturing line were first connected to form an outer cylinder. After forming, a plurality of exhaust pipes may be inserted into the outer cylinder via a baffle plate or an end plate, and according to such an embodiment, as in the above-described embodiment,
It is possible to achieve the intended purpose.

In addition, for example, in the embodiment shown in FIG. 1 (b), the connection end of the exhaust outlet pipe 25 and the perforated pipe 55 is abutted, but for example, the connection end of the exhaust outlet pipe 25 is enlarged in diameter. Then, of course, the perforated tube 55 may be inserted into the connection end.

[0040]

As described above, according to the silencer according to each claim, when manufacturing a long silencer with the aim of improving the silencing performance, it is necessary to newly install equipment or modify an existing production line. In addition to being unnecessary, the workability is better and the cost can be reduced as compared with a conventional example in which the exhaust pipe is three-dimensionally bent or the exhaust pipe is connected to a plurality of mufflers.

[Brief description of the drawings]

FIG. 1A is a cross-sectional view of an existing standard silencer, and FIG. 1B is a cross-sectional view of a silencer according to the first embodiment of claims 1 and 2.

FIG. 2A is a cross-sectional view of an existing standard silencer, and FIG. 2B is a cross-sectional view of a silencer according to a second embodiment of the present invention.

FIG. 3A is a cross-sectional view of an existing standard silencer, and FIG. 3B is a cross-sectional view of a silencer according to one embodiment of claims 1 and 3.

[Explanation of symbols]

1, 49, 79, 87, 131, 133 Cylindrical body 3, 5, 45, 47, 75, 77, 89, 91 End plate 21 Exhaust introduction pipe 25, 67 Exhaust extraction pipe 37, 51, 81 Sound absorbing material 39, 41 , 43, 57, 59, 61, 127, 129
Silencer 55,85 Perforated pipe 135 Outer cylinder

Claims (3)

[Claims] 1. A silencer characterized in that an outer cylinder (135) is formed by connecting a plurality of cylinders (1, 49, 79, 131, 133) each having a predetermined length or less. 2. An exhaust pipe (21, 2) is provided in a cylindrical body (1, 49).
5,29,33,35,55,67,71,73,8
5) A silencer (3) having a length less than a certain length
9. The muffler according to claim 1, wherein a plurality of (9, 43, 59, 61) are connected. 3. An exhaust pipe (141, 147, 14) is provided in an outer cylinder (135) connecting a plurality of cylinders (131, 133).
9. The muffler according to claim 1, wherein the muffler is inserted.