JP2000213328A - Muffler - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain the radiation sound reducing effect by a simple device structure. SOLUTION: This muffler 10 is provided with an outer shell 11, a through pipe 12, separators 13 and cushioning members 14. The cushioning member 14 is a stainless net or mesh, formed into such a shape as to be continuous in the circumferential direction of the outer shell 11, and pinched between the peripheral edge 13c of the separator 13 and the inner peripheral surface of the outer shell 11. In noise, namely, sound waves, contained in exhaust gas introduced to the muffler 10, the noise level is reduced by the expansion effect and the resonance effect. When exhaust gas passes through an exhaust passage, the outer shell 11 is vibrated by pulsation. Since the cushioning member 14 is pinched between the peripheral edge 13c of the separator 13 and the inner peripheral surface of the outer shell 11, the cushioning member 14 damps the vibration of the outer shell 11. Therefore, noise, namely, radiation sound, to be generated by vibration of the outer shell 11 is reduced.

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 an exhaust system of an engine of an automobile or the like.

[0002]

2. Description of the Related Art Hitherto, silencers of various structures have been known as mufflers to be attached to an exhaust system of an engine of an automobile or the like. are doing.

For example, as shown in FIG. 6, a silencer includes a substantially cylindrical outer shell 101, a through pipe 102 penetrating the outer shell 101 from the upstream side to the downstream side, and separators 103, 103 partitioning the inside of the outer shell 101. A vessel 100 is known. Penetrating pipe 102
Is connected to the upstream exhaust pipe UP and the downstream exhaust pipe LP, and has a number of small holes 102 a in a portion existing in the outer shell 101. Noise or sound waves contained in the exhaust gas introduced into the silencer 100
The noise enters the room separated by the separator 103 from the second small hole 102a, and the noise level is reduced by the expansion effect and the resonance effect. The separator 103 plays a role of supporting the through pipe 102 on the outer shell 101.

[0004]

However, in the silencer 100 of FIG. 6, it has been difficult to say that the radiated sound (noise generated by vibration of the silencer 100) is sufficiently reduced. In order to sufficiently reduce radiated sound, a cylindrical cover (not shown) is provided outside the outer shell 101 to form a space between the outer shell 101 and the cylindrical cover, and this space is filled with a sound absorbing material such as glass wool. (Hereinafter referred to as triple skin cover). But,
In this case, there is a problem that the device configuration is complicated and the cost is increased.

[0005] The present invention has been made in view of the above problems, and an object of the present invention is to provide a muffler that can obtain a radiation sound reducing effect with a simple device configuration.

[0006]

Means for Solving the Problems and Effects of the Invention In order to solve the above problems, a muffler according to the present invention is provided with a substantially cylindrical shell and provided inside the shell to reduce the rigidity of the shell. A ring member to be improved, an exhaust passage extending from an upstream opening to a downstream opening of the shell, and a buffer member sandwiched between a peripheral edge of the ring member and an inner peripheral surface of the shell to attenuate vibration of the shell. And characterized in that:

The exhaust gas flowing through the upstream exhaust pipe passes through the exhaust passage of the muffler of the present invention. That is, the exhaust gas enters the muffler from the upstream opening of the shell, then reaches the downstream opening of the shell, and flows out of the muffler therefrom. When the exhaust gas passes through the exhaust passage, the shell vibrates due to pulsation and the like, but in the present invention, since the buffer member is sandwiched between the peripheral edge of the ring member and the inner peripheral surface of the shell,
This cushioning member damps the vibration of the shell. As a result,
The noise generated by the vibration of the shell, that is, the radiated sound, is effectively reduced. Although the ring member plays a role of improving the rigidity of the shell, the ring member also plays a role as a member for holding the cushioning member in the present invention.

In the muffler of the present invention, the buffer member is preferably a stainless steel net or mesh. The use of a stainless steel net or mesh is preferable because even if the net or mesh is used for a long time, the performance of the net or mesh is less likely to deteriorate due to corrosion and the like, and the vibration of the shell can be attenuated well over a long period of time.

Further, in the muffler of the present invention, it is preferable that the cushioning member has a shape continuous in the circumferential direction of the shell. The cushioning member may be arranged intermittently along the circumferential direction of the shell, but a shape that is continuous in the circumferential direction is preferable because vibration of the shell can be more easily attenuated.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Preferred embodiments of the present invention will be described below with reference to the drawings. [First Embodiment] FIG. 1 is an explanatory view of a muffler according to a first embodiment, and FIG. 2 is a sectional view taken along line AA of FIG. The silencer 10
This is a sub-muffler made of stainless steel (SUS) and includes an outer shell 11, a through pipe 12, a separator 13 (corresponding to a ring member of the present invention), and a buffer member 14.

The outer shell 11 is formed by closing both ends of a cylindrical body 11b having a larger diameter than the upstream exhaust pipe UP and the downstream exhaust pipe LP. The through pipe 12 is the outer shell 1
1 upstream opening 11 provided in the upstream closing plate 11d
downstream opening 2 provided in the closing plate 11e on the downstream side from
It is provided so as to penetrate the outer shell 11 to 1c. The through pipe 12 is connected to the upstream exhaust pipe UP and the downstream exhaust pipe LP, and has a number of small holes 12 a in a portion existing in the outer shell 11. The separators 13, 13 partition the inside of the outer shell 11 into a plurality of rooms 15, 16, 17. Each separator 13 includes a partition plate 13a and a cylindrical peripheral portion 13c. A through pipe 12 is inserted through substantially the center of the separator 13, and the through pipe 12 is supported by a flange 13 d of the separator 13. The buffer member 14 is a net or mesh made of stainless steel, is formed in an annular shape, that is, a shape that is continuous in the circumferential direction of the outer shell 11, and is sandwiched between the peripheral portion 13 c of the separator 13 and the inner peripheral surface of the outer shell 11. Perimeter 1
3c and the outer shell 11 are resistance-welded (in this case, spot-welded) with the buffer member 14 interposed therebetween.
It should be noted that instead of welding, the separator 13 is
It may be press-fitted inside.

The exhaust passage of the silencer 10 is provided in the outer shell 1.
This is a passage from one upstream opening 11a to the downstream opening 11c. The white arrows in FIG. 1 indicate the direction in which the exhaust gas flows (the same applies to other drawings). Next, the operation of the muffler 10 of the present embodiment will be described. The noise or sound wave contained in the exhaust gas introduced into the silencer 10 is:
The noise level is reduced by the expansion effect, the resonance effect, and the like into the rooms 15, 16, 17 of the outer shell 11 through the small holes 12a of the through pipe 12. When the exhaust gas passes through the exhaust passage, the outer shell 11 vibrates due to pulsation or the like. However, since the buffer member 14 is sandwiched between the peripheral portion 13 c of the separator 13 and the inner peripheral surface of the outer shell 11, Attenuates the vibration of the outer shell 11. As a result, noise generated by the vibration of the outer shell 11, that is, radiation noise is effectively reduced. The separators 13, 13 serve not only to partition the inside of the outer shell 11 into a plurality of chambers 15, 16, 17, but also to hold the pipe 12 in the outer shell 11 and to support the outer shell 11 from the inside, so that
Also plays the role of improving the rigidity of the.

According to the silencer 10, the following effects can be obtained. That is, the radiation noise reduction effect can be effectively obtained by a simple device configuration in which the buffer member 14 is sandwiched between the peripheral portion 13c of the separator 13 and the inner peripheral surface of the outer shell 11. Further, since the cushioning member 14 is a stainless steel net or mesh, even if it is used for a long period of time, the performance of the net or the mesh is less likely to deteriorate due to corrosion or the like, and the vibration of the outer shell 11 can be favorably attenuated over a long period of time. Further, since the cushioning member 14 has a shape that is continuous in the circumferential direction of the outer shell 11, the outer shell 1 is smaller than when the buffer member 14 is intermittently arranged in the circumferential direction of the outer shell 11.
1 is easier to attenuate. The separator 13
A plurality of punching holes may be provided in the partition plate portion 13a.

[Second Embodiment] FIG. 3 is an explanatory view of a muffler according to a second embodiment, and FIG. 4 is a sectional view taken along line BB of FIG. The silencer 20 is a sub muffler made of stainless steel (SUS), and includes an outer shell 21, a through pipe 22, and a ring 2.
3 and a buffer member 24.

The outer shell 21 has a small-diameter upstream opening 2.
1a, a downstream opening 21c, and a large-diameter central portion 21b. The through pipe 22 extends from the upstream opening 21a of the outer shell 21 to the downstream opening 21c.
1 is provided. This penetrating pipe 2
Reference numeral 2 is connected to the upstream exhaust pipe UP and the downstream exhaust pipe LP, and has a number of small holes 22 a in a portion existing in the outer shell 21. The rings 23 are members for supporting the outer shell 21 from the inside, and the outer shell 2
1 plays a role in improving the rigidity. Each ring 23 includes a donut portion 23a having a through hole 23b and a cylindrical peripheral portion 23c. The through hole 23b is formed to have a diameter sufficiently larger than the outer diameter of the through pipe 22, and the through pipe 22 is inserted therethrough. Cushioning member 24
Is the same as that of the first embodiment, and is sandwiched between the peripheral portion 23 c of the ring 23 and the inner peripheral surface of the outer shell 21. The peripheral portion 23c and the outer shell 21 are resistance-welded (in this case, spot-welded) with the buffer member 24 interposed therebetween. Note that the ring 23 may be press-fitted inside the buffer member 24 instead of welding.

The exhaust passage of the silencer 20 is
Except for the difference between the first embodiment and the ring 23, the third embodiment is almost the same as the first embodiment, and therefore the description thereof is omitted. Further, the operation and effect of the silencer 20 are substantially the same as those of the first embodiment, and thus the description thereof is omitted. Note that the ring 23 is
In addition to the role of improving the rigidity of the first member, it also serves as a member for holding the buffer member 24.

[Third Embodiment] FIG. 5 is an explanatory diagram of a muffler 30 according to a third embodiment. The silencer 30 is a main muffler made of stainless steel (SUS), and the outer shell 3
1, inlet pipe 32, outlet pipe 33,
The first and second separators 34 and 35, the ring 36, and stainless steel net or mesh buffer members 37 to 39 are provided.

The outer shell 31, like the outer shell 11 of the first embodiment, is formed by closing both ends of a cylindrical body 31b. The inlet pipe 32 is the outer shell 31
From the upstream opening 31a of the second separator 35 and the ring 3
6, provided to penetrate the first separator 34. The inlet pipe 32 is connected to the upstream exhaust pipe UP. The outlet pipe 33 is provided so as to pass through the first separator 34, the ring 36, and the second separator 35 from the downstream opening 31c of the outer shell 31. The outlet pipe 33 is connected to the downstream exhaust pipe LP.

The first and second separators 34 and 35 partition the inside of the outer shell 31 into a plurality of chambers 41, 42 and 43, and the first separator 34 is a partition plate 34a having a plurality of punching holes 34b. And cylindrical peripheral edge 3
4c, the second separator 35 includes a partition plate portion 35a having a plurality of punched holes 35b and a cylindrical peripheral portion 3.
5c. The buffer members 37 and 38 are sandwiched between the peripheral edges 34 c and 35 c of the separators 34 and 35 and the inner peripheral surface of the outer shell 31. The first and second separators 34 and 35 are connected to the inlet pipe 32.
And outlet pipe 33 with flanges 34d, 35d
And the role of improving the rigidity of the outer shell 31.

The ring 36 has a donut portion 36a having a through hole 36b having a diameter slightly smaller than the inner diameter of the outer shell 11.
And a cylindrical peripheral portion 36c. This ring 36 also plays a role of improving the rigidity of the outer shell 31 similarly to the first and second separators 34 and 35. The buffer member 39 is sandwiched between the peripheral edge 36 c of the ring 36 and the inner peripheral surface of the outer shell 31. In addition,
The first and second separators 34 and 35 and the ring 36 correspond to a ring member of the present invention.

The exhaust passage of the silencer 30 is
1 inlet pipe 32 penetrating through the upstream opening 31a
Through the punching hole 34b of the first separator 34, the through hole 36b of the ring 36, and the punching hole 35b of the second separator 35, into the outlet pipe 33, and reach the downstream opening 31c.

Next, the operation of the muffler 30 of the present embodiment will be described. The noise, that is, the sound wave, contained in the exhaust gas introduced into the silencer 30 is reduced in the noise level from the inlet pipe 32 to the outlet pipe 33 by the expansion effect and the resonance effect. Further, the outer shell 31 vibrates due to the pulsation of the exhaust gas or the like. However, since the cushioning members 37 to 39 attenuate the vibration of the outer shell 31, noise generated by the vibration of the outer shell 31, that is, radiation noise is effectively reduced. This silencer 30 has the same effect as the first embodiment.

It should be noted that the embodiments of the present invention are not limited to the above-described embodiments at all, and it goes without saying that various forms can be adopted as long as they fall within the technical scope of the present invention. For example, in the silencers 10 and 20, the penetration pipe 1
2, the upstream exhaust pipe UP and the upstream opening 11 are not provided.
a (or 21a), and the downstream exhaust pipe LP and the downstream opening 11c (or 21c) may be connected.
Also in this case, a radiation sound reduction effect can be obtained.

In the silencer 10, the through pipe 1
A sound absorbing material such as glass wool may be filled between the outer shell 11 and the outer shell 11. This applies to the silencer 20 as well.
Further, in the silencer 10, only one separator 13 may be provided in the outer shell 11, or three or more separators may be provided. This point is the ring 23 of the silencer 20, the silencer 3
The same applies to the zero separators 34, 35 and the ring 36.

Then, in the silencer 30, the buffer member 37
If at least one of -39 is provided, a radiation sound reduction effect can be obtained, but if all are provided, the effect becomes remarkable, so that it is preferable.

[Brief description of the drawings]

FIG. 1 is an explanatory diagram of a silencer according to a first embodiment.

FIG. 2 is a sectional view taken along line AA of FIG.

FIG. 3 is an explanatory diagram of a muffler according to a second embodiment.

FIG. 4 is a sectional view taken along line BB of FIG. 3;

FIG. 5 is an explanatory diagram of a muffler according to a third embodiment.

FIG. 6 is an explanatory diagram of a conventional silencer.

[Explanation of symbols]

10: silencer, 11: outer shell, 11a
..Upstream opening, 11b cylindrical body, 11c downstream opening, 12 through pipe, 12a small hole,
13 ... separator, 13a ... partition plate part, 13b
... Punching hole, 13c ... Peripheral part, 13d ...
-Flange part, 14 ... cushioning member.

Claims (3)

[Claims] A shell formed in a substantially cylindrical shape; a ring member provided inside the shell to improve the rigidity of the shell; an exhaust passage extending from an upstream opening to a downstream opening of the shell; A muffler, comprising: a buffer member that is sandwiched between a peripheral edge of the ring member and an inner peripheral surface of the shell to attenuate vibration of the shell. 2. The muffler according to claim 1, wherein said buffer member is a stainless steel net or mesh. 3. The muffler according to claim 1, wherein the buffer member is continuous in a circumferential direction of the shell.