JP2004036529A - Exhaust muffler for vehicle - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an exhaust muffler for a vehicle with a tail pipe having no sound absorbing material while suppressing increase in manufacturing cost. <P>SOLUTION: The exhaust muffler for the vehicle comprises cylindrical members 1, 3 formed into approximately cylindrical shapes, partition members 4, 5 for partitioning the cylindrical members 1, 3 into a plurality of chambers, and the tail pipe 11 inserted into a through-hole 5a of the partition member 5 and welded to the partition member 5 in such a state for communicating the chambers in the partitioned cylindrical members 1, 3 with outside air, wherein exhaust air introduced into the cylindrical members 1, 3 can be exhausted from the tail pipe 11. On the outer periphery face of the tail pipe 11 only near its portion welded to the partition member 5, an abutting member 15 is formed which is set at such a selective dimension that it can abut on the inner peripheral surface of the through-hole 5a of the partition member 5. <P>COPYRIGHT: (C)2004,JPO

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a vehicle exhaust muffler for discharging exhaust from an engine in a motorcycle or the like.
[0002]
[Prior art]
2. Description of the Related Art Conventionally, as shown in FIG. 8, an exhaust muffler disposed on a motorcycle for exhausting engine exhaust includes an inner cylinder member 101 formed by rolling a punched metal having a large number of holes, and an inner cylinder member 101 formed by rolling. A housing comprising a heat-absorbing sound-absorbing material 102 formed over the outer surface of the cylindrical member 101 and a corresponding member 103 covering the outside of the outer sound-absorbing material and disposed coaxially with the inner cylindrical member 101 is provided. The interior of the housing is separated by partition members 104 and 105, and is formed by forming three chambers (chambers X, Y and Z).
[0003]
A tail pipe 111 is inserted into the exhaust muffler 100 through a through hole 105a formed in the partition member 105 so as to communicate the chamber Y with the outside air, and a first pipe communicating the chamber X with the chamber Z. 112, and a second pipe 113 that communicates the chamber Z with the chamber Y is provided. After the exhaust gas introduced into the housing from the inlet member 106 flows in each chamber, the tail pipe 111 flows from the tail pipe 111 to the outside air. It is configured to be able to drain. Note that reference numeral 114 in the figure denotes a baffle plate provided in the chamber X.
[0004]
The tail pipe 111 is formed by rolling a punched metal, and a tail pipe cover 109 is provided at an end on the outside air side. Further, an outer peripheral pipe 108 is welded to an outer peripheral surface of the tail pipe 111, and a sound absorbing material 107 for absorbing noise generated by exhaust gas discharged is provided between the outer peripheral pipe 108 and the tail pipe 111. It is arranged.
[0005]
[Problems to be solved by the invention]
However, the conventional vehicle exhaust muffler has the following problems. In other words, the sound absorbing material 107 disposed on the outer peripheral surface of the tail pipe 111 is necessary to clear the noise regulation in a vehicle used in a country where noise regulation is strict, such as Japan, but the noise regulation is used by the vehicle. Depending on the country, there are some countries where the noise regulation is less strict than Japan, and there are no regulations themselves. When used in such a country, the sound absorbing material 107 may not be necessary.
[0006]
If the sound absorbing material 107 becomes unnecessary, the outer peripheral pipe 105 for holding the sound absorbing material 107 becomes unnecessary, and it is sufficient if the outer peripheral surface of the tail pipe 111 and the inner peripheral surface of the through hole 105a of the partition member 105 are welded. Since the outer diameter of the tail pipe 111 is formed smaller than the inner diameter of the through hole 105 a by the outer peripheral pipe 108, when the tail pipe 111 is inserted into the through hole 105 a of the partition member 105, a large clearance exists between them. Occurred and could not be welded.
[0007]
Therefore, in order to manufacture an exhaust muffler in which the sound absorbing material 107 is not provided on the tail pipe, when the tail pipe 111 is inserted into the through hole 105a of the partition member 105, the clearance therebetween can be welded. It is necessary to newly prepare a partition member having a small through-hole 105a, or to change the tail pipe 111 to a large diameter, and there is a risk that manufacturing costs may be deteriorated due to a problem such as parts management.
[0008]
The present invention has been made in view of such circumstances, and it is an object of the present invention to provide a vehicle exhaust muffler that can be provided with a tail pipe having no sound absorbing material while suppressing deterioration in manufacturing cost.
[0009]
[Means for Solving the Problems]
The invention according to claim 1 is a cylindrical member formed into a substantially cylindrical shape, a partition member that partitions the inside of the cylindrical member into a plurality of chambers, and a partition member inserted through a through hole formed in the partition member. By being welded to the partition member in a state, the partition member has a tail pipe communicating the outside air with a chamber defined in the tubular member, and exhaust gas introduced into the tubular member is discharged from the tail pipe. In the exhaust muffler for a vehicle, the tail pipe has an abutment arbitrarily set so that it can abut on an inner circumferential surface of the through-hole of the partition member only in a vicinity of a welded portion of the tail pipe with the partition member. The member is formed.
[0010]
According to this configuration, when the tail pipe is inserted into the through hole of the partition member, the inner peripheral surface of the through hole and the outer peripheral surface of the tail pipe are in contact with each other via the contact member. If this is the case, the tail pipe can be welded and fixed in the through hole of the partition member. The contact member is arranged on the outer peripheral surface of the tail pipe so as to be in contact with the inner peripheral surface of the through hole by setting an arbitrary dimension.
[0011]
The invention according to claim 2 is characterized in that the tail pipe is flared at its chamber-side end.
[0012]
The invention according to claim 3 is characterized in that the contact member is formed in a hollow shape so as to have a space inside, and glass wool is interposed in the space.
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, embodiments of the present invention will be specifically described with reference to the drawings.
The vehicle exhaust muffler according to the present embodiment is provided in a motorcycle for discharging engine exhaust, and as shown in FIG. 1, is formed by rolling a punching metal having a large number of holes formed therein. An inner cylinder member 1, a heat-absorbing sound-absorbing material 2 formed so as to cover the outer surface of the inner cylinder member 1, and disposed outside the sound-absorbing material 2 and coaxially with the inner cylinder member 1. A housing comprising an outer cylinder member 3; the interior of the housing is separated by partition members 4 and 5 to form a plurality of chambers (first chamber A, second chamber B and third chamber C); It is configured. The inner cylindrical member 1 or the corresponding member 3 constitutes a cylindrical member according to the present invention.
[0014]
At the base end side (left end in the figure) of the exhaust muffler, an inlet member 6 for connection with an exhaust pipe (not shown) of the motorcycle by bolts b is attached, while at the front end side (right end in the figure). ) Is provided with a discharge port member 10 including an inner member 7, an outer member 8, and a tail pipe cover 9. The flanges of the inner member 7 and the outer member 8 and the distal end of the outer cylindrical member 3 are integrally welded at a position P to form an integral structure.
[0015]
The tail pipe cover 9 is supported by the inner member 7 and the outer member 8 at the distal end of the exhaust muffler, and fixes the distal end of the tail pipe 11 in a state where the tail pipe 11 described later is inclined. In addition, the base end side is supported by the through-hole 5a in the partition member 5, but the details will be described later.
[0016]
The connection between the chambers separated by the partition members 4 and 5 and the outside air is performed by the first pipe 12, the second pipe 13, and the tail pipe 11. The first pipe 12 is arranged such that one end opens to the first chamber A and the other end opens to the third chamber C, and connects the first chamber A and the third chamber C, The second pipe 13 is arranged such that one end opens to the second chamber B and the other end opens to the third chamber C, and connects the second chamber B and the third chamber C.
[0017]
That is, a hole 4a as shown in FIG. 2 is formed below the partition member 4, and is welded in a state where one end of the first pipe 12 is inserted into the hole 4a. 3, a hole 5b as shown in FIG. 3 is formed, and is welded in a state where the other end side of the first pipe 12 is inserted into the hole 5b, so that the One pipe 12 is in a fixed state.
[0018]
On the other hand, as shown in FIG. 3, two holes 5 c are formed in the partition member 5, and each of the holes 5 c is welded in a state where the second pipe 13 is inserted therethrough, and the second chamber B and the third chamber 5 c are welded. It is configured to be connected to the room C. As shown in the figure, a through hole 5a is also formed above the partition member 5, and the tail pipe 11 is inserted into the through hole 5a in an inclined state and welded.
[0019]
The tail pipe 11 is formed by rolling a punched metal having a plurality of holes, and has a base end side (the left end side in FIG. 1) subjected to flaring. The tail pipe 11 has a contact member 15 only in the vicinity of a welded portion of the outer peripheral surface with the partition member 5, and the contact member 15 is in contact with the inner peripheral surface of the through hole 5 a of the partition member 5. It is arbitrarily sized so that it can touch.
[0020]
That is, as shown in FIG. 4, the contact member 15 is welded and fixed to the outer peripheral surface of the tail pipe 11 formed to have an outer diameter d smaller than the inner diameter D (see FIG. 3) of the through hole 5a. The outer diameter of a portion of the through hole 5a to be inserted into the through hole 5a is substantially D (preferably slightly smaller than D in order to insert the through hole 5a), and comes into contact with the inner peripheral surface of the through hole 5a.
[0021]
Therefore, the tail pipe 11 and the partition member 5 can be welded, and the tail pipe having the sound absorbing material over substantially the entire outer periphery, the sound absorbing material being removed, and the partition member used at that time. Can be assembled in the vehicle exhaust muffler as it is, thereby suppressing a reduction in manufacturing cost.
[0022]
Since the contact member 15 is formed by bending the upper and lower ends of the thin plate material at the illustrated positions of the tail pipe 11, the contact member 15 is formed in a hollow shape so as to have a space inside, and Glass wool 16 is interposed in the space. By arranging the glass wool 16 in the contact member 15, when the contact member 15 is welded to the tail pipe 11 or when welding to the inner peripheral surface of the through hole 5a of the partition member 5, oxidation of the inner surface is prevented. Can be suppressed.
[0023]
That is, the oxidation during welding is caused by the reaction between the oxygen in the air and the material of the contact member 15. Therefore, if the glass wool 16 is interposed in the contact member 15, The flow of air is suppressed in the space in the above, and oxidation during welding is suppressed. Therefore, the welding strength of the contact member 15, the tail pipe 11, and the partition member 5 can be improved, and the quality of the entire vehicle exhaust muffler can be improved.
[0024]
With the above-described configuration, the exhaust gas derived from the exhaust pipe of the motorcycle is guided from the first chamber A to the third chamber C via the first pipe 12, and then through the two second pipes 13. It is introduced into the second chamber B and discharged therefrom via the tail pipe 11.
[0025]
A baffle plate 14 made of punched metal is disposed in the first chamber A to increase the frequency of a sound wave generated when exhaust gas passes through the first chamber A. This is because the sound absorbing material 3 interposed between the inner cylinder member 1 and the outer cylinder member 3 absorbs the sound of the high frequency band more easily than the sound of the low frequency band. 14.
[0026]
Next, a method of assembling the exhaust muffler will be described.
First, as shown in FIG. 5, a glass wool 16 is interposed in a contact member 15 having an outer diameter substantially the same as the inner diameter D of the partition member 5, and the tip of the tail pipe 11 flared in that state. The contact member 15 is inserted from the side (the end on the side not subjected to the flare processing). Then, the contact member 15 is fixed by welding at a position where the partition member 5 is inserted into the tail pipe 11, and these members are integrated.
[0027]
Thereafter, as shown in FIG. 6, the first pipe 12 is inserted through the holes 4a and 5b of the partition members 4 and 5, and is fixed by welding, and the second pipe 13 is inserted through the hole 5c of the partition member 5 for welding. At the same time, the tail pipe 11 to which the contact member 15 is welded is fixed to the inner peripheral surface of the through hole 5a of the partition member 5 by welding to manufacture a sub-assembly.
[0028]
The sub-assembly is inserted into the inner cylinder member 1 from the front end side, and the inner cylinder member 1 and the front end side of the inner member 7 are welded, and the partition members 4 and 5 are welded to the inner cylinder member 1 at respective positions. Thereby, these are integrated. At this time, the welding between the inner cylinder member 1 and each of the constituent members (the partition members 4 and 5) is performed only at a predetermined point by arc spot welding, so that the influence of welding heat is minimized. .
[0029]
Next, as shown in FIG. 7, the baffle plate 14 is fitted to a predetermined position of the first chamber A among the first chamber A, the second chamber B, and the third chamber separated by the partition members 4 and 5. The inner sound absorbing member 2 is fixed to the inner circumferential surface of the inner cylindrical member 1 by welding, and the cylindrical sound absorbing material 2 is mounted on the outer circumferential surface of the inner cylindrical member. Then, as shown in FIG. 1, the outer cylindrical member 3 whose end is welded to the inlet member 6 is mounted on the outer peripheral surface of the sound absorbing material 2, and the tail pipe cover 9 and the outer member 8 are mounted on the tail pipe 11 side. I do.
[0030]
Thereafter, the distal end of the outer cylinder member 3 and the flanges of the inner cylinder member 1 and the outer member 8 are collectively welded, and these are integrated, thereby completing a series of main assembling steps of the exhaust muffler. The outer peripheral surface of the outer cylindrical member 3 in the exhaust muffler manufactured in this manner is subjected to a desired polishing, painting process, or the like, and is attached to an exhaust pipe (not shown) of the motorcycle with a bolt b.
[0031]
According to the vehicle exhaust muffler, the tail pipe having the sound absorbing material disposed on the entire outer periphery and the partition member into which the tail pipe is inserted are used as they are without changing the dimensions. And the deterioration of the manufacturing cost can be suppressed. Further, since the glass wool 16 is interposed in the contact member 15, the internal oxidation of the contact member 15 during welding can be suppressed.
[0032]
Although the present embodiment has been described above, the present invention is not limited to this, and may be applied to, for example, an exhaust muffler in another vehicle. In addition, the thick member is welded and fixed to the outer peripheral surface of the tail pipe so that the outer diameter is substantially the same as the inner diameter of the through hole of the partition member, and this may be used as an abutting member. In this case, since no space is formed inside, In addition, there is no internal oxidation at the time of welding, and no intervention such as glass wool is required. It should be noted that instead of glass wool, another material such as steel wool may be used.
[0033]
【The invention's effect】
According to the first aspect of the present invention, when the tail pipe is inserted into the through hole of the partition member, the contact member is provided on the tail pipe outer peripheral surface with an arbitrary dimension set so as to contact the inner peripheral surface of the through hole. The tail pipe can be welded and fixed to the partition member without changing both the tail pipe and the partition member, and the sound absorbing material is provided while suppressing the deterioration of the production cost and the production cost. Tail pipe can be provided.
[0034]
According to the second aspect of the present invention, the tail pipe can be used in common with the one that does not require the sound absorbing material and the tail pipe that does not require the sound absorbing material. In addition, it is possible to suppress a decrease in manufacturing cost.
[0035]
According to the invention of claim 3, since the glass wool is interposed inside the contact member, when the contact member is welded to the outer peripheral surface of the tail pipe, or when the partition member is welded to the inner peripheral surface of the through hole, Oxidation inside the contact member can be suppressed.
[Brief description of the drawings]
1 is a longitudinal sectional view showing a vehicle exhaust muffler according to an embodiment of the present invention; FIG. 2 is a sectional view taken along line II-II in FIG. 1; FIG. 3 is a sectional view taken along line III-III in FIG. 4 is an enlarged view showing an end portion of a tail pipe in a vehicle exhaust muffler according to an embodiment of the present invention. FIG. 5 is a schematic diagram showing an assembling process in a vehicle exhaust muffler according to an embodiment of the present invention. FIG. 7 is a schematic diagram illustrating an assembling process in a vehicle exhaust muffler according to an embodiment of the present invention. FIG. 7 is a schematic diagram illustrating an assembling process in a vehicle exhaust muffler according to an embodiment of the present invention. Longitudinal cross section shown [Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 ... Inner cylinder member 2 ... Sound absorbing material 3 ... Outer cylinder member 4, 5 ... Partition member 6 ... Inlet member 7 ... Inner member 8 ... Outer member 9 ... Tail pipe cover 10 ... Outlet member 11 ... Tail pipe 12 ... 1 pipe 13 second pipe 14 baffle plate 15 contact member 16 glass wool 4a, 5b, 5c hole 5a through hole b bolt

Claims (3)

A cylindrical member formed in a substantially cylindrical shape,
A partition member for partitioning the inside of the tubular member into a plurality of chambers,
A tail pipe that is inserted into a through hole formed in the partition member and is welded to the partition member in that state, thereby communicating a room partitioned in the tubular member with outside air,
In the vehicle exhaust muffler having a, which can discharge the exhaust introduced into the cylindrical member from the tail pipe,
The tail pipe is characterized in that a contact member arbitrarily set so as to be able to contact the inner peripheral surface of the through-hole of the partition member is formed only in the vicinity of a welded portion of the tail pipe with the partition member. Exhaust muffler for vehicles. 2. The exhaust muffler for a vehicle according to claim 1, wherein the tail pipe is provided with a flared finish at a chamber side end. 3. The exhaust muffler for a vehicle according to claim 1, wherein the contact member is formed in a hollow shape so as to have a space therein, and glass wool is interposed in the space.

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