JP2006233862A - Muffler for vehicle - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a muffler for a vehicle, for preventing biting of an outer peripheral end part of a sound absorbing member between an outer peripheral part of the partition wall and a shell when the sound absorbing member and a partition wall are press-fitted in the shell and thereby to weld the partition wall with the outer peripheral part of the shell well. <P>SOLUTION: In the muffler for a vehicle, the sound absorbing member 8 and the partition walls 6, 7 are arranged in the tubular shell 2 with a state where the sound absorbing member is closely contact with the partition walls, and outer peripheral parts 13 of the partition walls 6, 7 are fixed with welding S1. A chamfered faces 8a are formed to at least outer peripheral end parts of the sound absorbing member 8, whose outer peripheral end parts are adjacent to weld portions of the outer peripheral parts 13 of baffle plates 6, 7 with the shell 2. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to a vehicle silencer, and more particularly, to a vehicle silencer in which a sound absorbing member and a partition wall are arranged in close contact with each other in a cylindrical shell, and the outer peripheral portion of the partition wall and the shell are fixed by welding. .

2. Description of the Related Art Conventionally, a technology for a vehicle silencer in which a sound absorbing member and a partition wall are disposed in close contact with each other in a cylindrical shell and the outer peripheral portion of the partition wall and the shell are fixed by welding has been publicly known (Patent Document). 1)
JP 2004-239222 A

However, in the conventional vehicle silencer, when the sound absorbing member and the partition wall are arranged in close contact with each other in the cylindrical shell, the sound absorbing member and the partition wall are usually press-fitted from the side of the shell. After that, since the outer peripheral portion of the partition wall and the shell are fixed by spot welding, the portion between the outer peripheral portion 013 of the partition wall 06 (06) and the shell 02 as shown in FIG. In the meantime, the outer peripheral end portion 08a of the sound absorbing member 08 bites in, and as a result, when spot welding S01 is performed on the outer peripheral portion 013 of the partition wall 06 (07) and the shell 02, there is a problem in that defective welding and spark failure occur. there were.
In addition, even when the shell is wound around the outer periphery of the internal structure in which the partition wall and the sound absorbing member are assembled in advance, the adhesion of the three parties must be ensured by winding the shell while applying pressure to the sound absorbing member and the partition wall. Such problems can arise because of this.

  The present invention has been made in order to solve the above-described problems, and the object of the present invention is to prevent the outer peripheral end of the sound absorbing member from biting between the outer peripheral portion of the partition wall and the shell, It is an object of the present invention to provide a vehicle silencer that can satisfactorily weld the partition wall and the outer periphery of the shell.

  In the invention according to claim 1 of the present invention, in the muffler for a vehicle, the sound absorbing member and the partition wall are arranged in close contact with each other in the cylindrical shell, and the outer peripheral portion of the partition wall and the shell are fixed by welding. A chamfered portion is provided at least at the outer peripheral end of the sound absorbing member adjacent to the outer peripheral portion of the partition wall and the welded portion of the shell.

  According to a second aspect of the present invention, in the vehicle silencer according to the first aspect, the chamfered portion is provided over the entire outer peripheral end of the sound absorbing member.

  In the invention according to claim 3, in the vehicle silencer in which the sound absorbing member and the partition wall are arranged in close contact with each other in the cylindrical shell, and the outer periphery of the partition wall and the shell are fixed by welding, at least the partition wall It is characterized in that the rigidity of the outer peripheral end portion of the sound absorbing member adjacent to the welded portion of the outer peripheral portion and the shell is made higher than that of other portions.

  In the invention according to claim 1 of the present invention, the sound absorbing member and the partition wall are arranged in close contact with each other in the cylindrical shell, and the sound deadening for a vehicle in which the outer peripheral portion of the partition wall and the shell are fixed by welding. Since the chamfered portion is provided at least at the outer periphery of the partition wall and the outer peripheral end of the sound absorbing member adjacent to the welded portion of the shell, the outer peripheral end of the sound absorbing member is prevented from biting between the outer periphery of the partition wall and the shell. Thus, the outer periphery of the partition wall and the shell can be favorably welded.

  In the invention of claim 2, since the chamfered portion is provided over the entire circumference of the outer peripheral end portion of the sound absorbing member, the sound absorbing member can be easily arranged regardless of the outer peripheral portion of the partition wall and the welded portion of the shell. Insertability when the sound absorbing member is press-fitted into the shell can be improved.

  In the invention according to claim 3, in the muffler for a vehicle, wherein the sound absorbing member and the partition wall are disposed in close contact with each other in the cylindrical shell, and the outer peripheral portion of the partition wall and the shell are fixed by welding. Since the rigidity of at least the outer periphery of the partition wall and the outer peripheral end of the sound absorbing member adjacent to the welded part of the shell is higher than that of other parts, the outer periphery of the partition wall and the shell are pressed when the sound absorbing member and the partition wall are press-fitted into the shell. It is possible to avoid the outer peripheral end of the sound absorbing member from biting into the gap between the two and the outer peripheral portion of the partition wall and the shell.

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

Example 1 will be described below.
1 is a side sectional view showing a vehicle silencer according to the first embodiment of the present invention, FIG. 2 is a sectional view taken along line S2-S2 of FIG. 1, FIG. 3 is a side view of the sound absorbing member according to the first embodiment, and FIG. FIG. 5 is an enlarged cross-sectional view of the main part at the position indicated by arrows A or B in FIG. 1. FIG. 6 is a diagram for explaining the assembly of the vehicle silencer according to the first embodiment. 8 is a view showing an example of a chamfered portion of the sound absorbing member.

First, the overall configuration will be described.
As shown in FIGS. 1 and 2, the body 1 of the vehicle silencer of the first embodiment includes a cylindrical shell 2 and end plates 3 and 4 disposed on both sides of the shell 2. It is formed in a substantially elliptical column shape.

The main body 1 is partitioned into four chambers R1 to R4 by three baffle plates 5, 6, and 7 (the baffle plates 6 and 7 correspond to partition walls), and the chamber R3 is in close contact with the baffle plates 6 and 7 The sound absorbing member 8 is arranged.
In addition, an inlet pipe 9 is provided in a state of passing through the end plate 3, the baffle plates 5, 6, 7 and the sound absorbing member 8, and an outlet in a state of passing through the end plate 4, the baffle plates 5, 6, 7 and the sound absorbing member 8. A pipe 10 is provided.
Further, an intermediate pipe 11 is provided in a state of penetrating the baffle plates 6 and 7 and the sound absorbing member 8.

  A plurality of communication holes 12 are formed in the inlet pipe 9, the intermediate pipe 11, and the outlet pipe 10 so as to communicate with the chamber R 3 in which the sound absorbing member 8 is disposed.

  Further, the outer peripheral portion 13 of each baffle plate 5, 6, 7 is refracted in the axial direction of the shell 2 and is formed in a dish shape.

As shown in FIGS. 3 and 4, the entire sound absorbing member 8 is formed in a substantially elliptical column shape, and chamfered portions 8 a having stepped diameters are formed on the outer peripheral ends on both sides of the sound absorbing member 8 over the entire circumference. Has been.
Note that the shape of the shell 2 is not limited to a substantially cylindrical shape, but various shapes such as a cylindrical shape, a quadrangular prism shape, and a triangular prism shape are conceivable, and the sound absorbing member 8 is also shaped accordingly.
Moreover, about the level | step difference of the chamfering part 8a, or the dimension of an axial direction width | variety, it can set suitably.
The sound absorbing member 8 is formed with through holes 8b, 8c, and 8d for arranging the inlet pipe 9, the intermediate pipe 11, and the outlet pipe 10 in a penetrating state.

Thereby, in the part of arrow A and B of FIG. 1, as shown in FIG. 5, the outer peripheral part 13 of each baffle plate 6,7, the corner part Z of the shell 2, and the chamfering part 8a of the sound absorption member 8 are obtained. A predetermined gap O is formed between them.
Moreover, the outer peripheral part 13 and the shell 2 of the baffle plates 6 and 7 are being fixed by spot welding S1 over several places, respectively.

In addition, the baffle plate 5 is formed with an opening hole 5a for connecting the two chambers R1 and R2, and the end plates 3 and 4 and the shell 2 are fixed by a lock seam portion 14 formed by winding. Has been.
Moreover, the sound absorbing member 8 of the first embodiment is made of glass wool, and the other constituent members are all made of metal.

Next, the operation of the first embodiment will be described.
When assembling the vehicle silencer configured in this way, first, as shown in FIG. 6, the baffle plate 6 is press-fitted from one side of the shell 2 to a predetermined position and arranged.

Next, after the sound absorbing member 8 is press-fitted from the other side of the shell 2 until it abuts against the baffle plate 6, the baffle plate 7 is pressed into the sound absorbing member 8 until it abuts, thereby arranging the baffle plate 6, 7 and the sound absorbing member 8 are brought into close contact with each other.
At this time, the sound absorbing member 8 is provided with the chamfered portion 8 a over the entire circumference of the outer peripheral end portion, so that the sound absorbing member 8 can be easily press-fitted into the shell 2.

  Next, the outer peripheral portion 13 and the shell 2 of the baffle plates 6 and 7 are fixed to each other by spot welding S1 over a plurality of locations. Here, the sound absorption is performed between the outer peripheral portion 13 of the baffle plates 6 and 7 and the shell 2. If the outer peripheral end of the member 8 bites in, there arises a problem that welding failure and spark failure occur during spot welding S1.

  However, in the vehicle silencer of the first embodiment, as described above, the chamfered portion 8a is provided at the outer peripheral end portion of the sound absorbing member 8, so that the outer peripheral portion 13 of the baffle plates 6 and 7 and the corners of the shell 2 are provided. A predetermined gap O can be formed between the portion Z and the chamfered portion 8a of the sound absorbing member 8, so that when the sound absorbing member 8 and the baffle plates 6, 7 are press-fitted into the shell 2, the baffle plates 6, 7 The outer peripheral end of the sound absorbing member 8 is prevented from biting between the outer peripheral portion 13 and the shell 2, and both can be satisfactorily fixed by spot welding S <b> 1.

  If the improvement in insertability of the sound absorbing member 8 is not taken into consideration, the chamfered portion 8a is formed at least at the outer peripheral end portion of the sound absorbing member 8 adjacent to the outer peripheral portion 13 of the baffle plates 6 and 7 and the welded portion of the shell 2. good.

The shape of the chamfered portion 8a can be set as appropriate, and a tapered chamfered portion 30 as shown in FIG. 7 or an arc-shaped chamfered portion 40 as shown in FIG. 8 may be formed.
In the first embodiment, the chamfered portions 8a are provided on both sides of the sound absorbing member 8, but may be provided only on one side.
Further, the chamfered portion 8a of the sound absorbing member 8 does not need to be integrally formed at the manufacturing stage of the sound absorbing member 8, and after the sound absorbing member having a shape excluding the chamfered portion 8a is formed, its end portion has a small outer diameter. A small separate sound absorbing member (corresponding to the chamfered portion 8a) may be overlapped and bonded together.

  Next, after the baffle plate 5 is press-fitted into the shell 2 to a predetermined position, the inlet pipe 9, the outlet pipe 10, and the intermediate pipe 11 are arranged.

  Finally, both the end plates 3 and 4 are arranged on both sides of the shell 2 and wound to form the lock seam portion 14, or the two are fixed by welding (not shown) to mute the vehicle. Finish the assembly of the vessel.

In addition, the inlet pipe 9 and the outlet pipe 10 are fixed to the corresponding end plates 3 and 4 by welding X and Y (see FIG. 1), and are illustrated at appropriate positions with respect to the baffle plates 5, 6, and 7. It is fixed by welding that is omitted.
Similarly, the intermediate pipe 11 is also fixed to the baffle plates 6 and 7 by welding (not shown) at appropriate positions.

Note that the assembly order of the internal members of the sound absorbing member 8, the baffle plates 6, 7 and the shell 2 described in FIG. 6 can be changed as appropriate.
That is, since the sound absorbing member 8 does not bite, it is possible to press the baffle plates 6 and 7 simultaneously into a predetermined position after the sound absorbing member 8 is first press-fitted into the shell 2. In this way, the efficiency of the assembly of the vehicle silencer can be improved.

  As shown in FIG. 1, the vehicle silencer configured as described above is connected to the inlet pipe 9 with a connection pipe on the engine side (not shown) and connected to the outlet pipe 10 with a tail pipe (not shown). As a result, a part of the exhaust gas (shown by the broken line arrow) flowing into the inlet pipe 9 from the connection pipe on the engine side is silenced by the sound absorbing member 8 through the communication hole 12 of the inlet pipe 9, and enters the chamber R 4. It flows in and receives the expansion / contraction action and is silenced.

  Next, a part of the exhaust gas in the chamber R4 flows in the order of the chamber R2 and the chamber R1 while being partly silenced by the sound absorbing member 8 of the chamber R3 through the communication hole 12 of the intermediate pipe 11, and is subjected to expansion and contraction action. Is muted.

  Finally, a part of the exhaust gas in the chamber R1 is exhausted to the tail pipe (not shown) while being partially silenced by the sound absorbing member 8 in the chamber R3 through the communication hole 12 of the outlet pipe 10.

Next, the effect of the first embodiment will be described.
As described above, in the vehicle silencer according to the first embodiment, the sound absorbing member 8 and the partition walls 6 and 7 are disposed in the cylindrical shell 2 in close contact with each other. In the vehicle silencer in which the outer peripheral portion 13 and the shell 2 are fixed by welding S1, the chamfered portion 8a is provided at the outer peripheral end portion of the sound absorbing member 8 at least close to the outer peripheral portion 13 of the baffle plates 6, 7 and the welded portion of the shell 2. Therefore, when the sound absorbing member 8 and the baffle plates 6 and 7 are press-fitted into the shell 2, the outer end of the sound absorbing member 8 bites between the outer peripheral portion 13 of the baffle plates 6 and 7 and the shell 2. Thus, the outer peripheral portion 13 of the baffle plates 6 and 7 and the shell 2 can be satisfactorily fixed by spot welding S1.
In the conventional invention, in order to eliminate the biting into at least one of the baffle plates 6, the baffle plate 6 is first press-fitted into the shell 2, the two are welded S1, the sound-absorbing member is press-fitted, and then the baffle plate 7 was pressed and welded together S1. However, the sound absorbing member 8 was pressed in advance and the baffle plates 6 and 7 were pressed into the shell 2 in order and welded S1 at the same time. It is also possible to weld S1 simultaneously after the sound absorbing member 8 is press-fitted and the baffle plates 6 and 7 are simultaneously press-fitted into the shell 2.

  Further, since the chamfered portion 8 a is provided over the entire circumference of the outer peripheral end portion of the sound absorbing member 8, the insertability when the sound absorbing member 8 is press-fitted into the shell 2 can be improved.

Example 2 will be described below.
The vehicle silencer of the second embodiment is the same as the first embodiment except that the rigidity of the outer peripheral end of the sound absorbing member 8 is higher than that of other parts. Are denoted by the same reference numerals, description thereof is omitted, and only differences are described in detail.

  9 is a side sectional view of a vehicle silencer according to a second embodiment of the present invention, FIG. 10 is a side view of the sound absorbing member 8, and FIG. 11 is a perspective view thereof.

As shown in FIGS. 9 to 11, in the vehicle silencer of the second embodiment, the heat treatment is performed in the range of the axial width W <b> 1 (see FIG. 10) over the entire circumference of the outer peripheral end 21 on both sides of the sound absorbing member 20. Has been done.
Specifically, the outer peripheral end portion 21 of the sound absorbing member 20 is in a state where the surface of the glass wool is baked and melted and hardened somewhat. It is higher than the part.
In addition, since the other structure is the same as that of the muffler for vehicles demonstrated in Example 1, the description is abbreviate | omitted.

Next, the operation of the second embodiment will be described.
When assembling the vehicle silencer configured as described above, first, as shown in FIG. 12, the baffle plate 6 is press-fitted and arranged from one side of the shell 2 to a predetermined position.

Next, the sound absorbing member 20 is press-fitted from the other side of the shell 2 until it abuts against the baffle plate 6, and then the baffle plate 7 is press-fitted until it abuts against the sound absorbing member 20. 7 and the sound absorbing member 8 are brought into close contact with each other.
At this time, since the heat treatment of the sound absorbing member 20 is performed over the entire circumference of the outer peripheral end portion 21, the sound absorbing member 20 can be easily press-fitted into the shell 2.

  Next, the outer peripheral portion 13 and the shell 2 of the baffle plates 6 and 7 are fixed by spot welding S1 over a plurality of locations. Here, the sound absorbing member is interposed between the outer peripheral portion 13 of the baffle plates 6 and 7 and the shell 2. If the outer peripheral end portion 20 of the 20 bites in, there arises a problem that welding failure and spark failure occur during spot welding S1.

  However, in the vehicle silencer of the second embodiment, as described above, the rigidity of the outer peripheral end portion 21 of the sound absorbing member 20 is higher than that of the other parts, so that the sound absorbing member is contained in the shell 2. 20 and the baffle plates 6, 7 can be pressed into the outer peripheral end 21 of the sound absorbing member 20 between the outer peripheral portion 13 of the baffle plates 6, 7 and the shell 2. , 7 and the outer peripheral portion 13 and the shell 2 can be fixed satisfactorily by spot welding S1.

  Next, after the baffle plate 5 is press-fitted into the shell 2 and disposed at a predetermined position, the inlet pipe 9, the outlet pipe 10, and the intermediate pipe 11 are disposed.

  Finally, the end plates 3 and 4 are arranged on both sides of the shell 2 and fixed by the lock seam portion 14 to complete the assembly of the vehicle silencer.

Next, the effect of the second embodiment will be described.
As described above, in the vehicle silencer of the second embodiment, the sound absorbing member 8 and the partition walls 6 and 7 are disposed in the cylindrical shell 2 in close contact with each other, and the outer peripheral portions of the partition walls 6 and 7 are disposed. In the vehicle silencer in which the shell 13 and the shell 2 are fixed by welding S1, the rigidity of at least the outer peripheral portion 13 of the baffle plates 6 and 7 and the outer peripheral end 21 of the sound absorbing member 20 adjacent to the welded portion of the shell 2 is set to other portions. Therefore, when the sound absorbing member 20 and the baffle plates 6 and 7 are press-fitted into the shell 2, the outer peripheral end 21 of the sound absorbing member 20 is between the outer peripheral portion 13 of the baffle plates 6 and 7 and the shell 2. It is possible to avoid biting in, so that the outer peripheral portion 13 and the shell 2 of the baffle plates 6 and 7 can be fixed satisfactorily by spot welding S1.
In the conventional invention, in order to eliminate the biting into at least one of the baffle plates 6, the baffle plate 6 is first press-fitted into the shell 2, the two are welded S1, the sound-absorbing member is press-fitted, and then the baffle plate The assembly order is required to press-fit 7 and weld S1. However, the sound-absorbing member 20 is press-fitted in advance and the baffle plates 6 and 7 are pressed into the shell 2 in order and welded S1 at the same time. It is also possible to weld S1 at the same time after the sound absorbing member 20 is press-fitted and the baffle plates 6 and 7 are simultaneously pressed into the shell 2.

  Further, the rigidity of the outer peripheral end portion 21 of the sound absorbing member 20 can be made higher than that of other portions by a simple method of heat-treating the outer peripheral end portion 21 of the sound absorbing member 20.

Although the present embodiment has been described above, the present invention is not limited to the above-described embodiment, and design changes and the like within the scope not departing from the gist of the present invention are included in the present invention.
For example, the specific material of the sound absorbing members 8 and 20 can be set as appropriate, and any material can be used as long as sound absorbing performance can be obtained.
Similarly, the shape of the outer peripheral portion 13 of the baffle plates 6 and 7 can be set as appropriate.
For example, the space O can be widened by performing a bead processing that protrudes in a direction away from the outer peripheral end of the sound absorbing member. However, in this case, since it takes time and cost to process the metal baffle plates 6 and 7, it is preferable to widen the space O by forming a large step or axial width of the chamfered portion 8a of the sound absorbing member.

  In the second embodiment, the outer peripheral end portion 21 of the sound absorbing member 20 is heated to increase its rigidity as compared with other parts. However, an annular metal member is attached to the outer peripheral end portion 21 of the sound absorbing member 20. You may make it fit. However, this is not preferable because the number of parts and the number of assembly steps are increased, and the sound absorbing member 20 may be buckled by the annular metal member when press-fitted into the shell 2.

  Further, the number of baffle plates installed (the number of chambers formed) and in which chamber the sound absorbing member 20 is arranged can be set as appropriate. For example, the end plates 3 and 4 may be used as partition walls.

  Therefore, the structure in the main body 1 and the flow of the exhaust gas can be set as appropriate, and design changes of the internal structural members caused by these are within the scope of the present invention.

It is a sectional side view which shows the silencer for vehicles of Example 1 of this invention. It is sectional drawing in the S2-S2 line | wire of FIG. It is a side view of the sound absorbing member of the first embodiment. It is a perspective view of the sound absorbing member of the first embodiment. It is a principal part expanded sectional view in the site | part of the arrow A or arrow B of FIG. It is a figure explaining the assembly of the silencer for vehicles of the present Example 1. It is a figure which shows an example of the chamfering part of a sound absorption member. It is a figure which shows an example of the chamfering part of a sound absorption member. It is a sectional side view of the silencer for vehicles of Example 2 of the present invention. It is a side view of the sound absorption member of the present Example 2. It is a perspective view of the sound absorbing member of the second embodiment. It is a figure explaining the assembly of the silencer for vehicles of the present Example 2. It is a sectional side view which shows the conventional silencer for vehicles. It is a principal part expanded sectional view in the site | part of the arrow C or arrow D of FIG.

Explanation of symbols

O space S1 spot welding X, Y welding Z corner R1, R2, R3, R4 chamber 1 main body 2 shell 3, 4 end plate 5, 6, 7 baffle plate 8, 20 sound absorbing member 8a chamfer 9 inlet pipe 10 outlet pipe 11 Intermediate pipe 12 Communication hole 13 Outer peripheral part (of baffle plate) 14 Lock seam part 21 Outer peripheral end part (of sound absorbing member)

Claims (3)

In the muffler for a vehicle in which the sound absorbing member and the partition wall are arranged in close contact with each other in the cylindrical shell, and the outer peripheral portion of the partition wall and the shell are fixed by welding.
A muffler for a vehicle comprising a chamfered portion at least at an outer peripheral end portion of a sound absorbing member adjacent to an outer peripheral portion of a partition wall and a welded portion of a shell. The muffler for a vehicle according to claim 1,
A muffler for a vehicle, wherein the chamfered portion is provided over the entire circumference of the outer peripheral end of the sound absorbing member. In the muffler for a vehicle in which the sound absorbing member and the partition wall are arranged in close contact with each other in the cylindrical shell, and the outer peripheral portion of the partition wall and the shell are fixed by welding.
A vehicular silencer characterized in that the rigidity of at least the outer peripheral end of the sound absorbing member adjacent to the outer peripheral portion of the partition wall and the welded portion of the shell is higher than that of the other portion.

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