JP2006152829A - Exhaust pipe structure - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an exhaust pipe structure capable of reducing noise called an explosive primary component resulting in "vehicle booming noise" while maintaining a low exhaust pressure loss. <P>SOLUTION: The inside space of the casing 130 of a muffler 130A is partitioned into a first chamber R1 positioned on the upstream side of an exhaust flow and a second chamber R2 positioned on the downstream side of the exhaust flow through a partition wall 133 in which a front alternating current side right pipe 104 and a front alternating current side left pipe 105 are passed. Also, an opening part 134 allowing the first chamber R1 to communicate with the second chamber R2 is formed in the partition wall 133. Holes 131a and 132a communicating with the first chamber R1 are formed in the front alternating side right pipe 104 and the front alternating side left pipe 105 positioned in the first chamber R1 on the upstream side of the exhaust flow. Also, holes 131b and 132b communicating with the second chamber R2 are formed in the front alternating side right pipe 104 and the front alternating side left pipe 105 positioned in the second chamber R2. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to an exhaust pipe structure employed in an internal combustion engine mounted on a vehicle.

  For example, according to the exhaust pipe structure adopted in the V-type engine, independent front pipes are connected to the left and right exhaust manifolds connected to the left and right sides of the V-type engine, respectively, and at the rear ends of these front pipes, the AC section is interposed. The exhaust pipe structure is integrated into one center pipe. FIG. 7 is a schematic diagram of an exhaust pipe structure 100 employed in a front engine / rear drive (FR) type vehicle when viewed in plan.

  In the case of the FR type vehicle, since the propeller shaft (not shown) is disposed along the center axis of the vehicle from the engine 1 toward the rear wheel side, the main mufflers 109 and 110 are arranged from the vehicle center axis. It is disposed at a position shifted in the left-right direction. The exhaust pipe structure 100 will be described in detail. The exhaust pipe structure 100 includes a right front exhaust pipe line 100a and a left front exhaust pipe line 100b that are connected to an engine and are disposed with a central axis interposed therebetween. The exhaust pipe line 100b is connected to and integrated with the rear exhaust pipe line 100c via an AC pipe 107 including an AC part.

  The right front exhaust pipe line 100a includes an internal combustion engine side right pipe 101 provided with a catalyst 101a in the middle region, and a front AC side right pipe 104 connected to the main muffler 109. A flange connection structure 120 is employed for connection with the front AC side right pipe 104. The left front exhaust pipe 100b also has an internal combustion engine side left pipe 103 provided with a catalyst 103a in the middle region, and a front AC side left pipe 105 connected to the main muffler 110. A flange connection structure 121 is employed for connection to the front AC side left pipe 105.

  The rear exhaust pipe line 100 c has a tail pipe 108 connected to the AC pipe 107, and a sub-muffler 111 is provided in an intermediate region of the tail pipe 108. A flange connection structure 122 is employed for connecting the AC pipe 107 and the tail pipe 108.

  According to the exhaust pipe structure 100 having the above-described configuration, the main mufflers 109 and 110 and the sub muffler 111 employ a straight flow type silencing mechanism, thereby realizing an ultra-low back pressure exhaust pipe structure. In addition, as another ultra-low back pressure exhaust pipe structure, for example, as disclosed in Patent Document 1 below, a structure in which a part that gathers at the rear ends of the left and right front pipes is provided in the muffler.

  Here, as described above, in the ultra-low back pressure exhaust pipe structure, a straight flow structure is adopted, which is composed of a combination of a high-frequency resonance chamber and a low-frequency resonance chamber. The high-frequency resonance chamber is generally effective for reducing airflow sound components (1 kHz to 5 kHz), and the low-frequency resonance chamber is effective for reducing sound at a pinpoint frequency in the vicinity of 50 Hz to 250 Hz. However, in a high-power gasoline engine having a large exhaust pulsation, exhaust sound over the entire range of 50 Hz to 150 Hz, called vehicle booming noise, is generated, and even in the combination of a high frequency resonance chamber and a low frequency resonance chamber, It is difficult to reduce the “buzzing noise”.

This “vehicle booming noise” is a sound called a primary explosion component, and this primary explosion component is mainly composed of exhaust pulsation due to the explosion timing in a high-power naturally aspirated engine. ing. In order to reduce the sound called the primary explosion component, the expansion effect in the muffler is effective. In order to obtain this expansion effect, it is necessary to greatly change the cross-sectional area of the exhaust gas flow. However, a large change in the cross-sectional area of the exhaust gas flow causes a large flow rate difference that abruptly converts a fast flow into a slow flow, resulting in an increase in exhaust pressure loss.
JP 2003-314274 A

  The problem to be solved by the present invention is to reduce noise called an explosion primary component that is the cause of “vehicle booming noise” while maintaining low exhaust pressure loss in an exhaust pipe structure including left and right front pipes. It is in a point that cannot be done. Therefore, an object of the present invention is to provide an exhaust pipe structure having a structure that enables reduction of sound called an explosion primary component that is the cause of “vehicle booming noise” while maintaining low exhaust pressure loss. is there.

  The exhaust pipe structure according to the present invention is an exhaust pipe structure in which the first exhaust pipe and the second exhaust pipe connected to the internal combustion engine are integrated into one third exhaust pipe via an AC portion. A muffler that covers the first exhaust pipe and the second exhaust pipe, and further, a muffler that covers the third exhaust pipe is provided, and a plurality of mufflers are provided in the muffler by partition walls. It is partitioned into spaces. A hole communicating with each space is provided at a selected position of each exhaust pipe located in each space, and a hole for communicating a space partitioned by this partition is also provided in the partition. .

  According to the exhaust pipe structure having the above-described configuration, a side flow is generated in which exhaust gas is discharged from a hole provided in the exhaust pipe into a space partitioned by a partition in the muffler. At this time, the expansion effect is obtained by passing the exhaust gas from the exhaust pipe to the space. In addition, since this side flow passes through the hole provided in the partition wall, a further expansion effect can be obtained and the sound called the explosion primary component can be reduced. As a result, the “vehicle booming noise” can be reduced. And This side flow is returned into the exhaust pipe through a hole provided in the exhaust pipe in the space after passing. Further, since the main exhaust gas flow is secured in the exhaust pipe, the exhaust pressure loss does not increase. In addition, by providing a plurality of partition walls and sequentially passing the side flow through the holes provided in each partition wall, a multi-stage expansion effect can be obtained, and exhaust pulsation caused by the primary explosion component can be effectively reduced. It is possible.

  Hereinafter, an exhaust pipe structure in each embodiment based on the present invention will be described with reference to the drawings. 7 that are the same as or equivalent to those in exhaust pipe structure 100 described in FIG. 7 are assigned the same reference numerals, and redundant description will not be repeated. As an example of a vehicle to which the exhaust pipe structure in each of the following embodiments is applied, a V-type engine, a front engine / rear drive (FR) system is used.

(Embodiment 1)
First, the exhaust pipe structure in the present embodiment will be described with reference to FIGS. 1 and 2. FIG. 1 is an overall perspective view showing the structure of the main muffler 130A, which is a characteristic part of the exhaust pipe structure in the present embodiment. FIG. 1 is a partially broken view for easy understanding of the internal structure. Show. FIG. 2 is a longitudinal sectional view showing the internal structure of the main muffler 130A.

  Referring to both the drawings, the exhaust pipe structure in the present embodiment has a front AC side right pipe 104 and a second exhaust pipe that constitute a first exhaust pipe line 100a connected to an engine (not shown) that is an internal combustion engine. This is an exhaust pipe structure 100 in which the front AC side left pipe 105 constituting the path 100b is integrated with the tail pipe 108 constituting one third exhaust pipe path 100c via the AC pipe 107 including the AC part 107c. A front AC side right pipe 104 and a front AC side left pipe 105 located upstream of the AC pipe 107 in the exhaust gas flow include a muffler 130A that covers the front AC side right pipe 104 and the front AC side left pipe 105 from the outside. Is provided.

  In the AC pipe 107, the pipe 107a that is bifurcated upstream of the AC section 107c constitutes the first exhaust pipe 100a in the same manner as the front AC side right pipe 104, and the pipe 107b is the front AC side left Similarly to the pipe 105, the second exhaust pipe line 100b is configured. In AC pipe 107, pipe 107d located on the downstream side of AC section 107c constitutes third exhaust pipe line 100c (the same applies to the following embodiments).

  The muffler 130A has a casing 130 having a substantially elliptical cross section in order to define a sealed space, and the front AC side right pipe 104 and the front AC side left pipe 105 have the casing 130 in the vertical direction. It penetrates. As an example of the size of the muffler 130A, the length of the housing 130 is about 630 mm and the capacity is 37 liters. The diameters of the front AC side right pipe 104 and the front AC side left pipe 105 are about 54 mm.

  Inside the housing 130, the partition 133 through which the front AC side right pipe 104 and the front AC side left pipe 105 penetrate, and the space in the housing 130 is located upstream of the exhaust flow, and the exhaust flow Is partitioned into a second chamber R2 located on the downstream side. The partition wall 133 is provided with an opening 134 communicating the first chamber R1 and the second chamber R2 outside the front AC side right pipe 104 and the front AC side left pipe 105, respectively.

  Holes 131a and 132a communicating with the first chamber R1 are provided on the upstream side of the exhaust flow of the front AC side right pipe 104 and the front AC side left pipe 105 located in the first chamber R1. Here, the upstream side of the exhaust flow indicates a position upstream of the half in the space of the first chamber R1. Each of the holes 131a and 132a has a diameter of about 4 mm, four rows in the axial direction and six rows in the circumferential direction, for a total of 24 holes. The front AC side right pipe 104 and the front AC side left pipe 105 located in the second chamber R2 are also provided with holes 131b and 132b communicating with the second chamber R2. The number and arrangement of the holes 131b and 132b are the same as those of the holes 131a and 132a, but the positions provided are not particularly limited.

  According to the exhaust pipe structure configured as described above, the exhaust is exhausted from the holes 131a and 132a provided in the front AC side right pipe 104 and the front AC side left pipe 105 to the first chamber R1 partitioned by the partition wall 133 in the muffler 130A. A side flow from which gas is discharged is generated. At this time, the expansion effect is obtained by passing the exhaust gas from the inside of each pipe to the first chamber R1. Further, when this side flow passes through the openings 134 and 134 provided in the partition wall 134 (arrows in FIG. 2), a further expansion effect is obtained, and it is possible to reduce and reduce sound called an explosion primary component. As a result, it is possible to reduce the “vehicle booming noise”. This side flow is returned into the pipes through holes 131b and 132b provided in the front AC side right pipe 104 and the front AC side left pipe 105 in the space R2 after passing. Further, since the main exhaust gas flow is ensured in the front AC side right pipe 104 and the front AC side left pipe 105, the exhaust pressure loss is not increased.

(Embodiment 2)
Next, the exhaust pipe structure in the present embodiment will be described with reference to FIG. FIG. 3 is a longitudinal sectional view showing the internal structure of the main muffler 130B employed in the exhaust pipe structure in the present embodiment. When compared with the configuration of the first embodiment, the main muffler 130B in the present embodiment has a configuration that covers the front AC side right pipe 104, the front AC side left pipe 105, and the AC pipe 107 from the outside. ing. The basic configuration of the housing 130 constituting the main muffler 130B is the same as that in the first embodiment.

  In the housing 130, the partition wall 133 having the same configuration as that of the first embodiment described above causes the space in the housing 130 to be located on the upstream side of the exhaust flow, and the downstream side of the exhaust flow. And is partitioned into a second chamber R2. In the present embodiment, the front AC side right pipe 104 and the front AC side left pipe 105 are located in the first chamber R1, and the AC pipe 107 is located in the second chamber R2.

  The same holes 131a and 132a as in the first embodiment are provided on the upstream side of the exhaust flow of the front AC side right pipe 104 and the front AC side left pipe 105 located in the first chamber R1. Further, a hole 135 is provided in the pipe 107d of the AC pipe 107 located in the second chamber R2. The holes 135 are about 4 mm in diameter, with four rows in the axial direction and 12 rows in the circumferential direction, for a total of 48 holes. The position where the hole 135 is provided is not particularly limited.

  According to the exhaust pipe structure configured as described above, the exhaust is exhausted from the holes 131a and 132a provided in the front AC side right pipe 104 and the front AC side left pipe 105 to the first chamber R1 partitioned by the partition wall 133 in the muffler 130A. A side flow from which gas is discharged is generated. At this time, the expansion effect is obtained by passing the exhaust gas from the inside of each pipe to the first chamber R1. Further, when this side flow passes through the openings 134 and 134 provided in the partition wall 134 (arrows in FIG. 3), a further expansion effect can be obtained, and reduction and reduction of sound called an explosion primary component is possible. As a result, it is possible to reduce the “vehicle booming noise”. This side flow is returned into the AC pipe 107 from the hole 135 provided in the AC pipe 107 in the space R2 after passing. In addition, since the main exhaust gas flow is secured in the front AC side right pipe 104, the front AC side left pipe 105, and the AC pipe 107, the exhaust pressure loss does not increase.

(Embodiment 3)
Next, the exhaust pipe structure in the present embodiment will be described with reference to FIG. FIG. 4 is a longitudinal sectional view showing an internal structure of main muffler 130C employed in the exhaust pipe structure in the present embodiment. When compared with the configurations of the first and second embodiments, the main muffler 130C in the present embodiment has a configuration that covers the AC pipe 107 from the outside, and the AC portion 107c of the AC pipe 107 is in the housing 130. Located in the first chamber R1.

  Further, the same holes 131a and 132a as those in the first embodiment are provided in the pipe 107a and the pipe 107b located on the upstream side of the exhaust flow of the AC pipe 107 located in the first chamber R1. Further, the same hole 135 as that in the second embodiment is provided in the pipe 107d of the AC pipe 107 located in the second chamber R2. The position where the hole 135 is provided is not particularly limited.

  According to the exhaust pipe structure configured as described above, the exhaust is exhausted from the holes 131a and 132a provided in the front AC side right pipe 104 and the front AC side left pipe 105 to the first chamber R1 partitioned by the partition wall 133 in the muffler 130A. A side flow from which gas is discharged is generated. At this time, the expansion effect is obtained by passing the exhaust gas from the inside of each pipe to the first chamber R1. Further, when this side flow passes through the openings 134 and 134 provided in the partition wall 134 (arrows in FIG. 4), a further expansion effect can be obtained, and a reduction in sound called an explosion primary component can be reduced. As a result, it is possible to reduce the “vehicle booming noise”. This side flow is returned into the AC pipe 107 from the hole 135 provided in the AC pipe 107 in the space R2 after passing. In addition, since the main exhaust gas flow is secured in the front AC side right pipe 104, the front AC side left pipe 105, and the AC pipe 107, the exhaust pressure loss does not increase.

(Embodiment 4)
Next, the exhaust pipe structure in the present embodiment will be described with reference to FIG. FIG. 5 is a longitudinal sectional view showing the internal structure of the main muffler 130D employed in the exhaust pipe structure in the present embodiment. The internal structure of the main muffler 130D in the present embodiment is similar to the configuration of the main muffler 130A described in the first embodiment, and the difference is that when the partition wall 133 is the first partition wall 133, the first chamber R1 The space R11 through which the front AC side right pipe 104 passes and the space R12 through which the front AC side left pipe 105 passes are partitioned by the second partition wall 141. The second partition wall 141 is provided with openings 141a and 141b communicating with the space R11 and the space R12 on the upstream side and the downstream side of the exhaust flow, respectively.

  Further, on the upstream side of the exhaust flow of the front AC side right pipe 104 located in the space R11 of the first chamber R1, a hole 131a communicating with the first chamber R1 is provided, and the space R12 in the first chamber R1 is formed in the space R12. A hole 132a communicating with the first chamber R1 is provided on the downstream side of the exhaust flow of the front AC side left pipe 105 located. The number and arrangement of the holes 131a and 132a are the same as in the first embodiment. The quantity and arrangement of the holes 131b and 132b are the same as those in the first embodiment.

  According to the exhaust pipe structure having the above-described configuration, the exhaust gas is discharged from the hole 131a provided in the front AC side right pipe 104 into the space R11 partitioned by the first partition wall 133 and the second partition wall 141 in the muffler 130A. A side flow occurs. At this time, the exhaust gas passes from the front AC side right pipe 104 to the space R11, so that an expansion effect is obtained. Further, when this side flow passes through the opening 141a provided in the second partition wall 141 (arrow in FIG. 5), a further expansion effect can be obtained, and reduction of sound called an explosion primary component can be reduced. As a result, it is possible to reduce the “vehicle booming noise”. The side flow further passes through the opening 141b provided in the second partition wall 141 and the opening 134 provided in the first partition wall 133, so that it is possible to obtain a multi-stage expansion effect. Exhaust pulsation caused by the primary component can be effectively reduced.

  Further, a side flow from which exhaust gas is discharged into the space R12 is also generated from the hole 132a provided in the front AC side left pipe 105. At this time, the exhaust gas passes from the front AC side right pipe 105 to the space R12, so that an expansion effect is obtained. Further, by passing through the opening 141b provided in the second partition wall 141 and the opening 134 provided in the first partition wall 133, it becomes possible to obtain a multi-stage expansion effect, resulting from the explosion primary component. Exhaust pulsation can be effectively reduced.

  Exhaust gas after passing through the first partition wall 133 passes through the holes 131b and 132b provided in the front AC side right pipe 104 and the front AC side left pipe 105 in the space R2, as in the first embodiment. Returned in. Further, since the main exhaust gas flow is ensured in the front AC side right pipe 104 and the front AC side left pipe 105, the exhaust pressure loss is not increased.

(Embodiment 5)
Next, the exhaust pipe structure in the present embodiment will be described with reference to FIG. FIG. 6 is a longitudinal sectional view showing the internal structure of the main muffler 130E employed in the exhaust pipe structure in the present embodiment. The internal structure of the main muffler 130E in the present embodiment approximates the configuration of the main muffler 130B described in the second embodiment, and the difference is that the partition wall 133 is the first as in the case of the fourth embodiment. In the case of the partition 133, in the first chamber R1, the space R11 through which the front AC side right pipe 104 passes and the space R12 through which the front AC side left pipe 105 passes are partitioned by the second partition 141. The second partition wall 141 is provided with openings 141a and 141b communicating with the space R11 and the space R12 on the upstream side and the downstream side of the exhaust flow, respectively.

  Further, on the upstream side of the exhaust flow of the front AC side right pipe 104 located in the space R11 of the first chamber R1, a hole 131a communicating with the first chamber R1 is provided, and the space R12 in the first chamber R1 is formed in the space R12. A hole 132a communicating with the first chamber R1 is provided on the downstream side of the exhaust flow of the front AC side left pipe 105 located. The number and arrangement of the holes 131a and 132a are the same as in the second embodiment. The quantity and arrangement of the holes 131b and 132b are the same as those in the second embodiment.

  According to the exhaust pipe structure having the above-described configuration, the exhaust gas is discharged from the hole 131a provided in the front AC side right pipe 104 into the space R11 partitioned by the first partition wall 133 and the second partition wall 141 in the muffler 130A. A side flow occurs. At this time, the exhaust gas passes from the front AC side right pipe 104 to the space R11, so that an expansion effect is obtained. Further, when this side flow passes through the opening 141a provided in the second partition wall 141 (arrow in FIG. 6), a further expansion effect can be obtained, and a reduction in sound called an explosion primary component can be reduced. As a result, it is possible to reduce the “vehicle booming noise”. The side flow further passes through the opening 141b provided in the second partition wall 141 and the opening 134 provided in the first partition wall 133, so that it is possible to obtain a multi-stage expansion effect. Exhaust pulsation caused by the primary component can be effectively reduced.

  Further, a side flow from which exhaust gas is discharged into the space R12 is also generated from the hole 132a provided in the front AC side left pipe 105. At this time, the exhaust gas passes from the front AC side right pipe 105 to the space R12, so that an expansion effect is obtained. Further, by passing through the opening 141b provided in the second partition wall 141 and the opening 134 provided in the first partition wall 133, it becomes possible to obtain a multi-stage expansion effect, resulting from the explosion primary component. Exhaust pulsation can be effectively reduced.

  The exhaust gas after passing through the first partition wall 133 is returned into the AC pipe 107 from the hole 135 provided in the AC pipe 107 in the space R2 as in the case of the second embodiment. In addition, since the main exhaust gas flow is secured in the front AC side right pipe 104, the front AC side left pipe 105, and the AC pipe 107, the exhaust pressure loss does not increase.

  In the above embodiment, the case where the exhaust pipe structure according to the present invention is applied to a V-type engine and a front engine / rear drive (FR) vehicle has been described. However, the V-type engine and the front engine / rear drive are described. The present invention is not limited to (FR) type vehicles, and the exhaust pipe structure according to the present invention can be applied to any vehicle that adopts an exhaust pipe structure that is integrated into one exhaust pipe after the exhaust pipe is drawn from the left and right. It is.

  Accordingly, the above-described embodiment disclosed herein is illustrative in all respects and does not serve as a basis for limited interpretation. Therefore, the technical scope of the present invention is not interpreted only by the above-described embodiments, but is defined based on the description of the claims. Further, all modifications within the meaning and scope equivalent to the scope of the claims are included.

1 is an overall perspective view showing a structure of a main muffler that is a characteristic part of an exhaust pipe structure in Embodiment 1 based on the present invention. It is a longitudinal cross-sectional view which shows the internal structure of the main muffler which is a characteristic part of the exhaust pipe structure in Embodiment 1 based on this invention. It is a longitudinal cross-sectional view which shows the internal structure of the main muffler which is a characteristic part of the exhaust pipe structure in Embodiment 2 based on this invention. It is a longitudinal cross-sectional view which shows the internal structure of the main muffler which is a characteristic part of the exhaust pipe structure in Embodiment 3 based on this invention. It is a longitudinal cross-sectional view which shows the internal structure of the main muffler which is a characteristic part of the exhaust pipe structure in Embodiment 4 based on this invention. It is a longitudinal cross-sectional view which shows the internal structure of the main muffler which is a characteristic part of the exhaust pipe structure in Embodiment 5 based on this invention. It is a whole top view which shows the exhaust pipe structure in background art.

Explanation of symbols

  100 exhaust pipe structure, 100a first exhaust pipe, 100b second exhaust pipe, 100c third exhaust pipe, 104 front AC side right pipe, 105 front AC side left pipe, 107 AC pipe, 107a, 107b, 107d, 107c AC section, 108 tail pipe, 130 housing, 130A, 130B, 130C, 130D, 130E main muffler, 131a, 132a, 131b, 132b, 135 holes, 133 partition (first partition), 134, 141a, 141b opening , 141 second partition, R1 first chamber, R2 second chamber, R11, R12 space.

Claims (5)

An exhaust pipe structure in which a first exhaust pipe and a second exhaust pipe connected to an internal combustion engine are integrated into one third exhaust pipe via an AC portion,
A muffler having a casing that covers a predetermined region of the first exhaust pipe line and the second exhaust pipe line from the outside is provided,
Inside the muffler, the space in the housing is located on the upstream side of the exhaust flow and the downstream side of the exhaust flow by a partition wall through which the first exhaust pipe and the second exhaust pipe pass. Partitioned into a second chamber,
The partition is provided with an opening communicating the first chamber and the second chamber,
A hole communicating with the first chamber is provided on the upstream side of the exhaust flow of the first exhaust pipe and the second exhaust pipe located in the first chamber,
An exhaust pipe structure in which a hole communicating with the second chamber is provided in the first exhaust pipe and the second exhaust pipe located in the second chamber. An exhaust pipe structure in which a first exhaust pipe and a second exhaust pipe connected to an internal combustion engine are integrated into one third exhaust pipe via an AC portion,
A muffler having a housing that covers a predetermined region of the first exhaust pipe, the second exhaust pipe, the AC unit, and the third exhaust pipe from the outside is provided,
In the muffler, the space in the housing is located on the upstream side of the exhaust flow and the downstream side of the exhaust flow by a partition wall through which the first exhaust pipe and the second exhaust pipe pass. And is partitioned into a second chamber including the AC unit and the third exhaust pipe,
The partition is provided with an opening communicating the first chamber and the second chamber,
A hole communicating with the first chamber is provided on the upstream side of the exhaust flow of the first exhaust pipe and the second exhaust pipe located in the first chamber,
An exhaust pipe structure, wherein the third exhaust pipe line located in the second chamber is provided with a hole communicating with the second chamber. An exhaust pipe structure in which a first exhaust pipe and a second exhaust pipe connected to an internal combustion engine are integrated into one third exhaust pipe via an AC portion,
A muffler having a housing that covers a predetermined region of the first exhaust pipe, the second exhaust pipe, the AC unit, and the third exhaust pipe from the outside is provided,
In the muffler, a partition through which the third exhaust pipe passes is divided into a first chamber located upstream of the exhaust flow and a second chamber located downstream of the exhaust flow. And
The partition is provided with an opening communicating the first chamber and the second chamber,
In the first exhaust pipe, the second exhaust pipe, and the alternating-current portion that are located in the first chamber, the first exhaust pipe and the second exhaust pipe are disposed upstream of the exhaust flow. There is a hole that communicates with one room,
An exhaust pipe structure, wherein the third exhaust pipe line located in the second chamber is provided with a hole communicating with the second chamber. An exhaust pipe structure in which a first exhaust pipe and a second exhaust pipe connected to an internal combustion engine are integrated into one third exhaust pipe via an AC portion,
A muffler having a casing that covers a predetermined region of the first exhaust pipe line and the second exhaust pipe line from the outside is provided,
Inside the muffler, a first partition through which the first exhaust pipe and the second exhaust pipe penetrate, a space in the housing is located upstream of the exhaust flow, and a downstream of the exhaust flow Partitioned into a second chamber located on the side,
The first partition has an opening communicating the first chamber and the second chamber;
The first chamber is partitioned by a second partition into a space through which the first exhaust pipe passes and a space through which the second exhaust pipe passes,
The second partition wall is provided with an opening that communicates the space through which the first exhaust pipe passes and the space through which the second exhaust pipe passes, on the upstream side and the downstream side of the exhaust flow,
A hole communicating with the first chamber is provided on the upstream side of the exhaust flow of the first exhaust pipe located in the first chamber,
On the downstream side of the exhaust flow of the second exhaust pipe located in the first chamber, a hole communicating with the first chamber is provided,
An exhaust pipe structure in which a hole communicating with the second chamber is provided in the first exhaust pipe and the second exhaust pipe located in the second chamber. An exhaust pipe structure in which a first exhaust pipe and a second exhaust pipe connected to an internal combustion engine are integrated into one third exhaust pipe via an AC portion,
A muffler having a housing that covers a predetermined region of the first exhaust pipe, the second exhaust pipe, the AC unit, and the third exhaust pipe from the outside is provided,
Inside the muffler, the space in the housing is located on the upstream side of the exhaust flow and the downstream side of the exhaust flow by a partition wall through which the first exhaust pipe and the second exhaust pipe pass. And is partitioned into a second chamber including the AC unit and the third exhaust pipe,
The first partition is provided with an opening that communicates the first chamber and the second chamber,
The first chamber is partitioned by a second partition into a space through which the first exhaust pipe passes and a space through which the second exhaust pipe passes,
The second partition wall has an opening that communicates the space through which the first exhaust pipe passes and the space through which the second exhaust pipe passes respectively on the upstream side and the downstream side of the exhaust flow,
A hole communicating with the first chamber is provided on the upstream side of the exhaust flow of the first exhaust pipe located in the first chamber,
On the downstream side of the exhaust flow of the second exhaust pipe located in the first chamber, a hole communicating with the first chamber is provided,
An exhaust pipe structure in which a hole communicating with the second chamber is provided in the AC section or the third exhaust pipe line located in the second chamber.

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