JP3145314B2 - Exhaust silencer - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an improvement in an exhaust silencer mounted on a vehicle.

[0002]

2. Description of the Related Art Conventionally, as an exhaust silencer mounted on a vehicle, for example, one having a joint structure as shown in FIG. 6 is known. The muffler 51 includes, for example, a cylindrical outer cylinder member 52 made of a rolled steel plate, end plates 53 and 54 made of a rolled steel plate joined to front and rear ends of the outer cylinder member 52, and an outer cylinder member 5.
2, and porous plates 55, 56, 57 disposed at predetermined intervals on the back side of the end plates 53, 54, and a plurality of partition plates 58, 59 partitioning the internal space of the outer tubular member 52 back and forth. 60
A plurality of communication pipes for communicating the partitioned space chambers are attached to predetermined partition plates 58, 59, and 60, and between the outer cylindrical member 52 and the porous plate 55, and each end plate 53. A sound absorbing material 61 such as glass wool is accommodated in a space of a predetermined gap between the porous plates 56 and 57 and the porous plates 56 and 57.

[0003] When assembling such a muffler, for example, the outer cylindrical member 52 in which holes are previously formed at a plurality of specific locations is provided.
Is formed into a cylindrical shape, and a porous plate 55 is wound around partition plates 58, 59, and 60 supporting the communication pipe to form a small set of interior parts.
After positioning the interior product and the outer cylinder member 52 by, for example, aligning the holes of the outer cylinder member 52 with the joint surfaces of the partition plates 58, 59, and 60, for example, by spot welding, Temporarily, and then MI through the hole of the outer cylinder member 52.
The main joining is performed by G welding. Separately, the front and rear end plates 53, 54 and the respective porous plates 56, 57 are joined together to form a small assembly, and finally, these are welded to both ends of the outer tubular member 52 to form a silencer. 51 is to be assembled.

[0004]

However, in such a manufacturing method, the number of steps such as the number of weldings from the small set to the final joining is large, and the outer cylindrical member 52 made of a rolled steel plate, the end plate 53, There is a problem that the surface treated surface of the welded portion 54 is destroyed in a large area by the influence of heat at the time of welding, after which a post-treatment such as full-surface painting is required, and the effect of thermal distortion at the time of welding is large. Was. Further, for example, the partition plates 58, 5
Since the welding of the outer cylinder member 52 and the outer cylinder member 60 is spot welding through the hole of the outer cylinder member 52, there is a problem that the airtightness in the partitioned space is not sufficient. Furthermore, in the conventional case, there are various design requirements such as, for example, winding a stainless steel plate around the upper surface of the outer cylinder member 52 that has been subjected to heat-resistant coating. In such a case, the number of man-hours increases, the material cost increases, and the cost increases. There was also the problem of becoming.

In view of the above, there is a demand for a manufacturing technique capable of reducing the number of steps in the manufacturing process, avoiding adverse thermal effects, improving the internal airtightness, and easily and inexpensively meeting various design requirements. I was

[0006]

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, the present invention is directed to an outer cylinder member composed of a pair of halves and joined to at least one of a front end and a rear end of the outer cylinder member. An end plate, a porous plate arranged at a predetermined interval on the back surface side of the outer cylinder member or the end plate and configured by a pair of halves, and a partition plate that partitions an internal space of the outer cylinder member back and forth. An exhaust silencer, wherein the outer cylinder member has an inner / outer multilayer structure in which a plurality of plate members are superimposed and simultaneously formed integrally with a press, and a pair of
After aligning the facing joining surfaces of the porous plate half,
The sound absorbing material is interposed so as to surround the periphery of the
If by disposing the formed outer tube member in the body superimposed facing bonding surface
Then, the joining surface of the porous plate was overlapped with the joining surface of the outer cylinder member and the end plate or the joining surface of the outer cylinder member and the partition plate, and the overlapped portion was integrally joined by laser welding.

[0007] If the joints of at least three parts are superimposed in this way, and the joints are simultaneously joined together by penetrating laser welding over the entire circumference along the circumferential direction, it is necessary to make a small assembly. As a result, the number of steps can be reduced, and the thermal effect can be kept in a narrow range by laser welding, thereby solving the problem of thermal distortion. In addition, since the entire circumference is joined, the problem of airtightness can be solved. Further, by laser welding, it is not necessary to make a hole in the outer cylinder member in advance as in MIG welding. With such a configuration, it is possible to meet various design requirements, such as providing a difference in the sheet pressure of the inner and outer plates or using a different material inside and outside, as compared with a conventional rolled steel sheet that is double-wound.

[0008] Further , an outer cylinder member composed of a pair of halves is provided .
On the facing joint surface, arranged at a predetermined interval on the back side of the outer cylinder member
The joining surfaces of the porous plates composed of a pair of halves were superposed, and the superposed portions were integrally joined by laser welding. And when the outer cylinder member and the porous plate are in a half-joined structure in this way, if the facing joining surfaces of the porous plate and the outer cylinder member are superimposed and laser welded together ,
The number of man-hours can be reduced , and the adverse thermal effect during welding can be avoided.

Further, the end plate of the front side of the end plate, if the exhaust pipe is connected, together with the exhaust pipe and the connection portion of the end plate to polymerize the bonding surface of the porous plate laser welding I tried to combine. Also, when a tail pipe is connected to the rear end plate of the end plates, the joining surface of the porous plate is superimposed on the connection portion between the tail pipe and the end plate and is integrally joined by laser welding. I made it. Also when connecting the exhaust pipe or the tail pipe to the end plate in this way, if these are collectively joined by penetrating laser welding, the number of steps can be similarly reduced, and furthermore, adverse effects such as thermal distortion can be achieved. Can be avoided.

[0010]

Further , the front and rear end plates and the outer cylinder member are made of an aluminum plated steel plate or a stainless steel plate or a combination thereof. By using such an aluminum-plated steel plate or a stainless steel plate, the entire coating after welding in the case of the conventional rolled steel plate is eliminated. At this time, both the end plate and the outer cylinder member may be made of an aluminum-plated steel plate or a stainless steel plate, or by combining these, for example, the end plate is made of an aluminum-plated steel plate, and the outer cylinder member is made of a stainless steel plate. Is also good. In addition to abolishing the conventional painting after welding, we will meet various design requirements.

Further , the outer cylinder member has a multilayer structure of an inner plate made of a rolled steel plate and an outer plate made of a heat-resistant and corrosion-resistant material such as a stainless steel plate or an aluminum-plated steel plate. Then, the inner plate and the outer plate were integrally formed by pressing. Here, the rolled steel sheet is a so-called SP material, and is a steel sheet obtained by rolling low-carbon steel cold or hot. By forming the outer cylinder member in a multi-layered form and laser-welding them all at once, the cost can be significantly reduced compared to the conventional method of additionally winding a stainless steel plate on the upper surface of a rolled steel plate. Can be done. Further, it is possible to cope with the variety of design requirements, and at the same time, it is possible to reduce the weight and enhance the noise reduction effect. Furthermore, since the outer plate is a stainless steel plate, painting after welding is unnecessary. In addition, if the inner plate and the outer plate are integrally formed by pressing, the two can be formed in close contact with each other, and handling such as positioning before welding becomes easy.

Further , at least one of the end plates has a multilayer structure of an inner plate made of a rolled steel plate and an outer plate made of a heat-resistant and corrosion-resistant material such as a stainless steel plate or an aluminum-plated steel plate. Then, the inner plate and the outer plate were integrally formed by pressing. Also, when the end plate has a multi-layer structure in this manner, similarly to the case of the outer cylinder member, painting after welding is unnecessary, and it is inexpensive as compared with the additional winding of a stainless steel plate. Can respond to diversity,
It can also reduce the weight and muffle the sound.

[0014]

Embodiments of the present invention will be described with reference to the accompanying drawings. Here, FIG. 1 is a longitudinal sectional view of the exhaust silencer of the present invention, and FIG.
(A) is an enlarged view of a portion A of FIG. 1, (B) is an enlarged view of a portion B of FIG. 1, and (C) is an enlarged view of a portion C of FIG.

As shown in FIG. 1, the exhaust silencer 1 of the present invention
A cylindrical outer tube member 2, a porous plate 3 joined to the rear surface of the outer tube member 2 at a predetermined interval, and end plates 4 attached to front and rear ends of the outer tube member 2; 5 and each end plate 4, 5
Are provided on the back surface side of the main body at a predetermined interval, and are provided with a plurality of partition plates 8, 9, which partition the in-cylinder space forward and backward in the cylinder of the outer cylinder member 2. 10 are attached.

The partition plates 8, 9, and 10 are provided with a central communication pipe 12 for communicating the partitioned space chambers and an intermediate portion of a tail pipe 13 also serving as the communication pipe. Is supported by the front end plate 4, and the rear end side of the tail pipe 13 is supported by the rear end plate 5, and a part of the rear end protrudes outside. An exhaust pipe 14 connected to an engine (not shown) is connected to a distal end of the communication pipe 12. And
A space between the outer cylinder member 2 and the porous plate 3 and each end plate 4;
A sound absorbing material 15 is accommodated in the space between the porous member 5 and the porous plates 6 and 7.

The joint structure of the outer cylindrical member 2, the end plates 4, 5, the porous plates 3, 6, 7 and the partition plates 8, 9, 10 among the joints of the respective members is shown in FIG. The structure is as shown in FIG. That is, as shown in FIG. 2 (A), the joint structure of the part A in FIG. 1 includes the front end plate 4, the porous plate 6, the end of the communication pipe 12, and the end of the exhaust pipe 14. The laser beams are radiated from the outside of the end plate 4 at a right angle to the axial direction, and the four members are welded almost simultaneously by the penetrating laser beam, and joined and integrated over the entire circumference along the circumferential direction. ing.

At this time, according to the laser welding, the beam width is narrow, so that the range in which the surface treatment layer around the welded portion of the end plate 4 is destroyed can be minimized, and the range of thermal influence is small. The adverse effects such as distortion can be avoided. In addition, welding can be performed at high speed because heat can be locally applied rapidly.

Next, FIG. 2 (B) shows the joint structure of the portion B in FIG.
As shown in FIG. 3, the end of the outer cylinder member 2, the end of the front end plate 4 and the end of the porous plate 6
Are welded almost simultaneously from the outside by a penetrating laser beam, and are joined and integrated over the entire circumference in the circumferential direction. Further, as shown in FIG. 2 (C), the joining structure of the portion C in FIG. 1 is such that the outer cylinder member 2, the end of the porous plate 3 and the end of the partition plate 9 are overlapped with each other to form an outer cylinder. The three members are almost simultaneously welded from the outside of the member 2 by penetrating laser light, and are joined and integrated over the entire circumference in the circumferential direction.

Similarly, part D in FIG. 1 is formed by superposing the end of the outer cylinder member 2, the end of the porous plate 3, the rear end plate 5, and the porous plate 7 on each other. The four members are welded almost simultaneously from the outside of the member 2 by a penetrating laser beam, and joined and integrated over the entire circumference. Further, part E in FIG. 1 connects the end plate 5, the porous plate 7, and the tail pipe 13 to each other. The laser light is irradiated from the outside of the end plate 5 in a direction substantially perpendicular to the pipe axis, and the three members are joined and integrated over the entire circumference.

Next, an example of an assembling procedure of the silencer 1 having such a joint structure will be described. First, a cylindrical outer cylinder member 2 is formed from a plate-like member. This molding is the same as the conventional method. Generally, a plate-like member is wound in a cylindrical shape, the both ends are overlapped, and the overlapped portion is welded along the longitudinal direction. On the other hand, the interior components housed in the cylinder of the outer cylinder member 2 are joined to form a small assembly. That is, each partition plate 8, 9, 1
The communication pipe 12 and the tail pipe 13 are inserted into the pilot hole formed in the hole 0 to be joined and integrated with the partition plates 8, 9 and 10.

Then, the porous plate 3 is wound and temporarily fixed between the partition walls 9 and 10 around the integrated interior product, and the temporarily fixed porous plate 3 and the interior product are connected to the cylinder of the outer cylinder member 2. In this case, the sound absorbing material 15 is accommodated in a space between the porous plate 3 and the outer tubular member 2. Then, the outer cylinder member 2
The end plates 4 and 5 and the porous plates 6 and 7 are fitted and temporarily fixed before and after, and the exhaust pipe 14 is inserted into the end of the communication pipe 12 for positioning.

When the tentative positioning of each part is completed in this way, laser welding is performed on the overlapped portions A to F in FIG. The laser welding is performed over the entire circumference of the overlapped portion. For example, the work is rotated around a laser welding machine while the work is rotated. By following such a procedure, the processing steps are extremely simplified, the airtightness of the space partitioned by the partition plates 8, 9, and 10 is increased, and thermal distortion can be reduced.

Incidentally, the material of the outer cylinder member 2 and the end plates 4 and 5 can be made of an aluminum-plated steel plate or a stainless steel plate or a combination thereof. At this time, for example, if the aluminum-plated steel plate is laser-welded, the oxide film on the surface layer can be easily removed by strong energy and welding can be easily performed. Therefore, no special post-treatment such as painting is required. The same is true for a stainless steel plate.
Therefore, for example, the outer cylinder member 2 and the end plates 4 and 5 are both made of aluminum-plated steel plate or stainless steel plate, or the end plates 4 and 5 are made of aluminum-plated steel plate and the outer cylinder member 2 is formed of stainless steel plate. Abolish post-processing such as full-surface painting after welding, and respond to the variety of designs.

Further, the outer cylinder member 2 and the end plate 4, as described above,
5 or both sides can have a double structure.
Here, FIG. 3 shows an example of a configuration in which the end plate 4 and the outer cylinder member 2 are integrally formed by a press at the same time to form a double structure. In both cases, the inner plates 4a and 2a are rolled steel plates, the outer plates 4b
b is a heat-resistant and corrosion-resistant material such as a stainless steel plate or an aluminum-plated steel plate, and by welding these at the same time, for example, in the past, if a rolled steel plate was welded, the entire surface was painted, or the stainless steel plate was additionally wound around the surface. And unnecessary steps can be eliminated, and the cost can be reduced. Also, by integrally molding with a press,
The adhesion between the inner and outer plates 2a, 2b or 4a, 4b is improved, and handling such as positioning during welding can be facilitated.

Moreover, by stacking two sheets, the thickness can be reduced as compared with the conventional case, and the weight can be reduced. Incidentally, for example, the thickness of both the inner plate and the outer plate was set to 0.8 t in the embodiment with respect to the conventional thickness of 2.0 t, for example, so that the total thickness was 1.6 t, which was thinner and lighter than the conventional one. Furthermore, it has been confirmed that the double structure can enhance the noise reduction effect.

The inner plate 2a and the outer plate 2b of the outer cylinder member 2 are
Not limited to the above-mentioned different materials, for example, it is also possible to use a homogeneous material such as an SP material or a stainless steel material, and simultaneously form them integrally by pressing, so that the inner plate 2a is thick and the outer plate 2b is formed.
Can be made thinner to meet various design requirements. Further, the outer cylinder member 2 is not limited to the double structure,
It is also possible to form a double or more layers.

By the way, in the above-described silencer joining structure, the present invention can be applied to a case where the end plate 5 is joined to the outer cylinder member 2 only on one side as shown in FIG. 5, for example. Needless to say, in addition, for example, the outer cylinder member 2 and the porous plate 3 are
g, 3f, and 3g can be applied to the case of a structure to be joined. In this case, the pair of porous plate halves 3f and 3g formed in a predetermined shape are positioned so that their facing joint surfaces are aligned with each other, and then the sound absorbing material 15 is interposed so as to surround the periphery thereof to form a pair of porous halves. The plate halves 2f and 2g are disposed, the facing joining surfaces are overlapped and positioned, and the overlapped overlapping surfaces are laser-welded along the longitudinal direction. Also in this case, the joining operation can be performed quickly by laser welding, the number of steps can be reduced as compared with the related art, and the range of adverse thermal effects can be narrowed.

[0029]

As described above, the present invention comprises a pair of halves.
In an exhaust silencer provided with an outer cylinder member, an end plate, a porous plate, and a partition plate formed, an outer cylinder member having an inner / outer multilayer structure in which a plurality of plate members are superimposed and simultaneously formed integrally by pressing is formed. Using, the joining surface of the porous plate was superimposed on the joining surface of the outer cylinder member and the end plate or the joining surface of the outer cylinder member and the partition plate, and this overlapped portion was integrally joined by laser welding, eliminating the need for a small set. As a result, the number of steps can be reduced, welding can be performed at a high speed, the thermal adverse effect is reduced, and the airtightness can be further improved. Further, as compared with a conventional rolled steel sheet that is double-wound, various design requirements can be met, such as providing a difference in the sheet pressure of the inner and outer plates or using a different material inside and outside. Further, the facing joining surface of the outer cylinder member composed of a pair of halves has a joining surface of a porous plate composed of a pair of halves disposed at a predetermined interval on the back side of the outer cylinder member. By polymerizing and joining the polymerized portions together by laser welding, it is possible to reduce the number of steps and avoid adverse thermal effects.

Further, when connecting an exhaust pipe to the end plate,
And integrally coupled to the connection portion of the exhaust pipe and the end plate at the polymerization of the bonding surface of the porous plate laser welding, also when connecting the tail pipe end plate, porous to the connection portion of the tail pipe and the end plate If the joining surfaces of the plates are polymerized and integrally joined by laser welding, the number of steps can be further reduced and adverse effects such as thermal distortion can be avoided. And
By forming the outer cylinder member into an inner / outer multi-layer structure formed simultaneously and integrally with a press, it is possible to meet various design requirements.

If the end plate and the outer cylinder member are made of an aluminum-plated steel plate or a stainless steel plate or a combination thereof, the conventional partial coating or front coating after welding can be eliminated, and the number of steps can be reduced. As well as being able to meet various design requirements. Further, the outer cylinder member has a multilayer structure of an inner plate made of a rolled steel plate and an outer plate made of a heat-resistant and corrosion-resistant material such as a stainless steel plate or an aluminum-plated steel plate , and the end plate has a similar multilayer structure. If this is the case, the entire coating after welding can be abolished, and the cost can be significantly reduced as compared with the conventional additional winding of a stainless steel plate or the like. In addition, it is possible to cope with the variety of design requirements, and at the same time, it is possible to reduce the weight and enhance the noise reduction effect. At this time, if the inner plate and the outer plate are integrally formed by a press, handling such as positioning before welding is easy, and the degree of adhesion between the two can be increased.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional view of an exhaust silencer according to the present invention.

FIGS. 2A and 2B are enlarged views of a joining portion, wherein FIG. 2A is an enlarged view of a portion A of FIG. 1, FIG. 2B is an enlarged view of a portion B of FIG. 1, and FIG.

FIG. 3 is a configuration example diagram in a case where the outer cylinder member and the end plate have a double structure.

FIG. 4 is a cross-sectional view showing a joint structure in a case where the outer cylinder member is constituted by a pair of halves;

FIG. 5 is an example of a silencer in which an end plate is joined only to one end of an outer cylinder member;

FIG. 6 is a partial cross-sectional view of a conventional silencer.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Exhaust silencer, 2 ... Outer cylinder member, 2a ... Inner plate, 2b ... Outer plate, 3 ... Porous plate, 4, 5 ... End plate, 6, 7 ... Porous plate,
8, 9, 10: partition plate, 13: tail pipe, 14: exhaust pipe.

──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A-59-162318 (JP, A) JP-A-6-10661 (JP, A) JP-A 4-76278 (JP, A) JP-A 54-162 147149 (JP, A) JP-A 62-183018 (JP, U) JP-A 63-170090 (JP, U) JP 2-47218 (JP, Y2) (58) Fields surveyed (Int. Cl. ⁷ , DB name) B23K 26/00 B21D 53/84 F01N 1/04 F01N 7/18

Claims (8)

(57) [Claims] 1. An outer cylinder member composed of a pair of halves, an end plate joined to at least one of a front end and a rear end of the outer cylinder member, and a back side of the outer cylinder member or the end plate. A porous plate arranged at a predetermined interval and composed of a pair of halves ,
And an exhaust muffler having a partition plate partitioning the internal space of the outer cylinder member back and forth, the outer cylinder member forms a simultaneous integral molded inner and outer double layer structure by polymerizing a plurality of plate members press one
Positioning of the pair of porous plate halves in alignment
After that, insert a sound absorbing material so as to surround
An outer cylinder member composed of a pair of halves is arranged to
Laminated and positioned, the joining surface of the porous plate is overlapped with the joining surface of the outer tube member and the end plate or the outer tube member and the partition plate,
An exhaust silencer made by combining this overlapped part by laser welding. 2. The exhaust silencer according to claim 1, wherein
An exhaust pipe connected to the engine is connected to a front end plate of the end plates, and a joining surface of the porous plate is superimposed on a connection portion between the exhaust pipe and the end plate and integrally joined by laser welding. Become an exhaust silencer. 3. A exhaust muffler according to claim 1 or claim 2, tail pipe in the rear end plate of said end plate is connected, the connection portion of the tail pipe and said end plate An exhaust silencer in which the joining surfaces of the porous plates are polymerized and joined together by laser welding. 4. A exhaust muffler according to claim 1 or claim 2 or claim 3, the end plate and the outer cylinder member around said, be made of an aluminum-plated steel or stainless steel, or combinations thereof An exhaust silencer characterized by: 5. The exhaust muffler according to any one of claims 1 to 4, the outer cylinder member, and an inner plate consisting of rolled steel, stainless steel or heat-resistant aluminum-plated steel plate or the like, resistance An exhaust silencer characterized by having a multi-layer structure of an outer plate made of ingredients. 6. The exhaust silencer according to claim 5 , wherein
An exhaust silencer, wherein the inner plate and the outer plate of the outer cylinder member are integrally formed by pressing. 7. The method of claim 1 or claim 2 or claim 3 or exhaust muffler according to claim 5 or claim 6, at least one side of said end plate, an inner plate consisting of rolled steel, Heat resistance of stainless steel plate or aluminum plated steel plate,
An exhaust silencer characterized by a multi-layer structure of an outer plate made of corrosion-resistant material. 8. The exhaust silencer according to claim 7 , wherein
An exhaust silencer, wherein an inner plate and an outer plate of the end plate are integrally formed by a press.