JP2008038852A - Vehicular muffler - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a vehicular muffler capable of forming the total length long, without deteriorating part single body accuracy and manufacturability. <P>SOLUTION: A shell 2 and pipes 3 to 5 of a muffler body 1 are formed by joining mutual divided parts 11 and 12 divided into a plurality. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a vehicle muffler.

2. Description of the Related Art Conventionally, a vehicle muffler is provided with an internal structure such as a pipe or a baffle plate in a silencer chamber surrounded by a cylindrical shell and an end plate (see Patent Documents 1 and 2).
JP 2005-264832 A

However, in the conventional vehicle muffler, if the entire length of the muffler main body is formed long in order to increase the capacity of the muffler chamber, there is a problem that a large-scale manufacturing facility is required and the accuracy of individual parts and manufacturability deteriorate. It was.
Therefore, it is conceivable that the muffler body is flattened and expanded in the width direction, but there are many cases where it is difficult due to interference with peripheral members.
Further, when the entire length of the muffler main body is formed long, the heat is greatly extended in the longitudinal direction due to heat input by the exhaust gas, and the stress may be concentrated on the end plate or the like, leading to cracks and breakage.

  The present invention has been made to solve the above-mentioned problems, and the object thereof is not to require a large-scale manufacturing facility, and to improve the accuracy of individual parts and the manufacturability, while increasing the overall length of the muffler body. It is an object of the present invention to provide a vehicle muffler that can be formed and can relieve stress caused by hot elongation.

  The invention according to claim 1 of the present invention is characterized in that at least the shell and the pipe of the muffler main body are formed by joining the divided portions divided into a plurality in the longitudinal direction.

  In the invention according to claim 1 of the present invention, at least the shell and the pipe of the muffler main body are formed by joining the divided parts divided into a plurality in the longitudinal direction. While making it good, the entire length of the muffler main body can be formed long, and at the same time, stress due to hot elongation can be relieved.

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

Example 1 will be described below.
1 is a plan view showing a vehicle muffler according to a first embodiment of the present invention, FIG. 2 is an exploded cross-sectional view thereof, FIG. 3 is a cross-sectional view thereof, and FIG. 4 is a view showing fixing of shells in divided portions of the first embodiment. FIG. 5 and FIG. 5 are diagrams showing an example of fixing the pipes in the divided portions of the first embodiment.

First, the overall configuration will be described.
As shown in FIG. 1, in the vehicle muffler of the first embodiment, the muffler body 1 is formed by combining a first divided portion 11 and a second divided portion 12 that are divided into two at the center in the longitudinal direction. ing.

  As shown in FIG. 2, the first divided portion 11 includes a first shell 11a, a first inlet pipe 11b, a first communication pipe 11c, a first outlet pipe 11d, an end plate 11e, a baffle plate 11f, 11g and a communication pipe 11h.

The first shell 11a is formed in a substantially cylindrical shape while being wound around the outer periphery of the plate-like baffle plates 11f and 11g, while one end portion thereof is formed with a reduced diameter portion 13a. The other end portion is fixed to the outer periphery of a substantially bowl-shaped end plate 11e by a lock seam portion 14a formed by lock seam processing.
The other end of the first shell 11a and the end plate 11e may be fixed by welding.

The first inlet pipe 11b is disposed in a state of penetrating the end plate 11e and the baffle plates 11f and 11g.
The first communication pipe 11c is arranged in a state of penetrating the baffle plate 11g, and a plurality of punching holes 15a are provided on the outer periphery on one end side thereof.
The communication pipe 11h is disposed so as to penetrate the baffle plate 11f.
11 d of 1st outlet pipes are arrange | positioned in the state which penetrated the baffle plate 11g.
Moreover, the one end part of each pipe 11b-11d is provided in the state which protruded only the dimension W1 rather than the one end part of the 1st shell 11a.

Further, the first shell 11a and the baffle plates 11f and 11g are fixed by spot welding S1 at a plurality of locations on the outer periphery thereof, and the baffle plates 11f and 11g respectively corresponding to the pipes 11b to 11d and 11h are both of them. The entire circumference is fixed by welding X1.
Furthermore, the 1st inlet pipe 11b and the end plate 11e are being fixed with welding X2 over these both perimeters.
The baffle plates 11f and 11g may be subjected to burring to form openings, and then the pipes 11b to 11d and 11h may be fixed by press-fitting. After the baffle plates 11f and 11g are assembled first, The order can be changed so as to press-fit the pipes 11b to 11d and 11h.

  On the other hand, the second dividing portion 12 is composed of a second shell 12a, a second inlet pipe 12b, a second communication pipe 12c, a second outlet pipe 12d, an end plate 12e, and baffle plates 12f and 12g. Yes.

The second shell 12a is formed in a substantially cylindrical shape while being wound around the outer periphery of the plate-like baffle plates 12f and 12g, while one end portion thereof is formed with a reduced diameter portion 13b. The other end portion is fixed to the outer periphery of a substantially bowl-shaped end plate 12e by a lock seam portion 14b formed by lock seam processing.
The other end of the second shell 12a and the end plate 12e may be fixed by welding.
The second inlet pipe 12b is disposed in a state of passing through the end plate 12e and the baffle plates 12f and 12g.
The second communication pipe 12c is arranged in a state of penetrating the baffle plates 12f and 12g, and a plurality of punching holes 15b are provided on the outer periphery on one end side thereof.
The second outlet pipe 12d is arranged in a state of penetrating the baffle plates 12f and 12g and the end plate 12e.

  Further, at one end of each of the pipes 12b to 12d, a diameter-enlarged portion 16 that is expanded so that the inner diameter is equal to the outer diameter of each of the corresponding pipes 11b to 11d, and flare in an inclined manner from the diameter-enlarged portion. A flare portion 17 that is processed and expanded in diameter is formed.

Further, the second shell 12a and the baffle plates 12f and 12g are fixed by spot welding S2 at a plurality of locations on the outer circumference of both of them, and the baffle plates 12f and 12g corresponding to the pipes 12b to 12d are respectively The entire circumference is fixed by welding X3.
Further, the second inlet pipe 12b and the end plate 12e are fixed by welding X4 over the entire circumference of both.
The baffle plates 12f and 12g may be subjected to burring to form openings, and then the pipes 12b to 12d may be fixed by press-fitting, and the baffle plates 12f and 12g are assembled before the pipes 12b and 12g are assembled. The order can also be changed to press fit ~ 12d.

  In addition, all the vehicle mufflers of the first embodiment are made of metal.

Next, the operation will be described.
When joining the divided parts 11 and 12 configured as described above, as shown in FIGS. 2 and 3, one end of the first shell 11 a and one end of each of the pipes 11 b to 11 d in the divided parts 11 and 12. Parts are inserted into one end of the corresponding second shell 12a and one end of each of the pipes 12b to 12d, and as shown in FIGS. 1 and 4, the ends of both shells 11a and 12a are welded over the entire circumference. The muffler body 1 is formed by performing X5.

At this time, since one end of each of the pipes 11b to 11d is provided so as to protrude from the one end of the first shell 11a by the dimension W1, the one end of each of the pipes 11b to 11d is provided for each of the corresponding pipes 12b to 12d. After inserting and fixing to one end part, the one end parts of both shells 11a and 12a can be fixed by welding X5, and it can fix reliably, visually observing fixation of each pipe 11b-11d and 12b-12d.
Further, by forming one of the pipes 11b to 11d longer than the other, it is possible to more easily insert the pipes 11b to 11d by using this pipe as a guide.

  Moreover, as shown in FIG. 5, the one end part of each pipe 11b-11d can be press-fitted in the enlarged diameter part 16 of the one end part of each corresponding pipe 12b-12d, respectively, and it can fix reliably.

Furthermore, even if an error occurs in the radial direction between the pipes 11b to 11d and 12b to 12d due to an error in the accuracy of individual parts of each component member or an error in assembling accuracy, one end of each of the pipes 11b to 11d is handled. The flare 17 of each of the pipes 12b to 12d can be surely guided to the enlarged diameter portion 16.
In addition, when an error occurs in the longitudinal direction between the pipes 11b to 11d and 12b to 12d, the insertion allowance of the enlarged diameter portion 16 can be tolerated.

  In the vehicle muffler configured as described above, as shown in FIG. 3, the muffler body 1 surrounded by the end plates 11e and 12e and the cylindrical shell 2 is provided with muffler chambers R1 to R6, One end of the inlet pipe 3 is arranged in communication with the muffler chamber R5, while one end of the outlet pipe 4 is arranged in communication with the muffler chamber R2.

  Further, the communication pipe 5 is arranged in communication with the muffler chambers R2, R5, and the communication pipe 11h is arranged in communication with the muffler rooms R1, R2.

  Therefore, in the vehicle muffler of the first embodiment, the muffler body 1 having a long overall length can be easily formed without deteriorating the accuracy of single parts or manufacturability.

  In particular, the longer the pipe length, the longer the inlet pipe 3 and outlet pipe 4 having better noise reduction performance can be formed without causing deterioration of component accuracy and manufacturability.

  Further, since the joint portion between the one end portions of the shells 11a and 12a and the joint portion between the one end portions of the pipes 11b to 11d and 12b to 12d are arranged offset in the axial direction, the muffler body 1 is refracted. Even if such a stress occurs, it can be prevented that the stress concentrates on the local area and the required rigidity can be easily secured.

  In the vehicle muffler configured as described above, the other end of the inlet pipe 3 is connected to a connection pipe on the engine side (not shown), while the other end of the outlet pipe 4 is connected to a tail tube (not shown). It is mounted on the vehicle in a state.

  Then, as shown in FIG. 3, exhaust gas (shown by a broken line arrow) that flows into the muffler body 1 from the connecting pipe (not shown) through the inlet pipe 3 flows into the muffler chamber R5 and is subjected to expansion and contraction to mute. After that, while flowing into the silencer chamber R2 via the communication pipe 5, the energy is attenuated by the silencer chambers R4 and R3 via the punching holes 15a and 15b and silenced.

  Further, the exhaust gas that has flowed into the muffler chamber R2 is muffled by being subjected to expansion / contraction, and then discharged to the outside through a tail tube (not shown).

  Further, the energy of the exhaust gas that has flowed into the silencer chamber R2 is silenced by receiving a resonance action in the silencer chamber R1 via the communication pipe 11h.

  At this time, the muffler main body 1 is elongated in the longitudinal direction by the heat input of the exhaust gas. However, since the muffler main body 1 is constituted by the divided portions 11 and 12 in the first embodiment, the stress due to the hot elongation is applied to the divided portions 11, 12 It is possible to disperse and relax with the constituent members.

Next, the effect will be described.
As described above, in the vehicle muffler of the first embodiment, the shell 2 and the pipes 3 to 5 of the muffler main body 1 are formed by joining the divided parts 11 and 12 divided into a plurality of parts. For this reason, the entire length can be formed without incurring deterioration of component accuracy or manufacturability.
Moreover, compared with the case where the muffler main body 1 is provided integrally, the stress caused by the thermal expansion can be dispersed and alleviated by the divided portions 11 and 12.

  Further, since the end portions of the shell 11a and the end portions of the pipes 11b to 11d in the divided portions 11 and 12 are fixed in a state of being inserted into the corresponding end portions of the other shell 12a and the end portions of the pipes 12b to 12d, respectively. The division parts 11 and 12 can be fixed easily.

Further, at least the end portions of the pipes 11b to 11d in the divided portions 11 and 12 are provided so as to protrude from the end portion of the shell 11a on one side, and the end portions of the pipes 11b to 11d are the end portions 12b to 12p of the other side pipe. Since the end of the shell 11a and the end of the other shell 12a are fixed after being fixed in the state of being inserted into 12d, the shells 11a and 12a are fixed together or the shells 11a and 12a and the pipes 11b to 11d are fixed. Compared to the case where 12b to 12d are fixed simultaneously, the pipes 11b to 11d and 12b to 12d can be reliably fixed while being visually observed.
Furthermore, since the division parts 11 and 12 are reduced in size, they can be easily manufactured without increasing the size of jig equipment such as shell winding.

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 a scope not departing from the gist of the present invention are included in the present invention.
For example, the number of divisions and the division position of the muffler body 1 can be set as appropriate. Similarly, the internal structure of the muffler body 1 can be set as appropriate.

  In the first embodiment, the shell and the pipe are divided in the longitudinal direction. However, the baffle plate may be divided and coupled.

  Furthermore, as a method of fixing the shells between the divided portions, as shown in FIG. 6, the shells 11a and 12a may be fixed by a lock seam portion 20 formed by locking one end portions of the shells 11a and 12a.

  Also, as shown in FIG. 7, one end of the first shell 11a is formed in a bead shape, while one end of the second shell 12a is formed in a flare shape, and a mesh or the like is provided between the two as necessary. It may be fixed by the clamp 22 with the sealing member 21 interposed therebetween.

  Further, as shown in FIG. 8, both ends of the shells 11a and 12a are formed in a flange shape, and a seal member 23 such as a mesh is interposed between the two shells 11a and 12a as necessary. The bolts and nuts 24 may be fastened at a plurality of locations on the outer periphery.

Similarly, the method of fixing the pipes in the divided portions is not limited to fixing by press-fitting, and as shown in FIG. 9, a sealing member 25 such as a mesh between the one end portions of both pipes 11b to 11d and 12b to 12d. You may make it insert and fix in the state which intervened.
Of course, you may use the fixing method of the pipe and shell in division parts other than having mentioned above.

  Furthermore, the end plates 11e and 12e can be omitted by spinning both ends of the shell 2 (the other end of the first shell 11a and the other end of the second shell 12a).

It is a top view which shows the muffler for vehicles of Example 1 of this invention. It is an exploded sectional view of the muffler for vehicles of Example 1 of the present invention. It is sectional drawing of the muffler for vehicles of Example 1 of this invention. It is a figure explaining fixation of the shells in the division parts of the present Example 1. FIG. It is a figure which shows an example of fixation of the pipes in the division parts of the present Example 1. It is a figure which shows the fixing method of the shells in the division parts of the other Example. It is a figure which shows the fixing method of the shells in the division parts of the other Example. It is a figure which shows the fixing method of the shells in the division parts of the other Example. It is a figure which shows the fixing method of the pipes in the division parts of other Examples.

Explanation of symbols

R1, R2, R3, R4, R5 Silencer chamber S1, S2 Spot welding X1, X2, X3, X4, X5 Welding 1 Muffler body 2 Shell 3 Inlet pipe 4 Outlet pipe 5 Communication pipe 11 First divided portion 11a First shell 11b 1st inlet pipe 11c 1st communication pipe 11d 1st outlet pipe 11e End plate 11f, 11g Baffle plate 11h Communication pipe 12 2nd division part 12a 2nd shell 12b 2nd inlet pipe 12c 2nd communication pipe 12d 2nd outlet pipe 12e End plate 12f, 12g End plate 13a Reduced diameter portion 14a, 14b Lock seam portion 15a, 15b Punching hole 16 Expanded portion 17 Flare portion 20 Lock seam portion 21 Seal member 22 Clamp 23, 25 Seal member 24 Bolt / Tsu door

Claims (3)

  A muffler for a vehicle, wherein at least a shell and a pipe of the muffler main body are formed by joining a plurality of divided portions divided in the longitudinal direction. The vehicle muffler according to claim 1,
A vehicle muffler characterized in that one end of the shell and the end of the pipe in the divided portions are fixed in a state of being inserted into the corresponding end of the other shell and the end of the pipe, respectively. The muffler for a vehicle according to claim 1 or 2,
Providing the end of at least one side of the pipes in the divided parts to protrude from the end of the shell on one side,
The vehicle is characterized in that the end of the one-side pipe is fixed in a state where it is inserted into the end of the other-side pipe, and then the end of the one-side shell and the end of the other-side shell are fixed. Muffler.

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