JP2008189198A - Exhaust port structure - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an exhaust port structure capable of suppressing the heat effect on a bumper cover in the structure making an atmospheric opening end of an exhaust gas opposing approaching the bumper cover. <P>SOLUTION: The exhaust port structure 10 comprises a muffler finisher 20 including a cover pipe 22 and a base plate 24. The cover pipe 22 covers a part including an atmospheric-opening end 16A in a tail pipe 16 backwardly projected in the longitudinal direction of a vehicle body from a main muffler 12 from an outer circumferential side in a front part 22A in the longitudinal direction of the vehicle body, and a rear end 22C of the longitudinal direction of the vehicle body is opened at the site of a through hole 18 formed in a bumper cover 14. The base plate 24 supports the cover pipe 22 by the vehicle body, and extends between the bumper cover 14 and an end plate 12A of the main muffler 12 respectively opposing asymmetrically with inner surfaces of the end plate 12A and the bumper cover 14. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to an exhaust outlet structure for releasing the exhaust gas of an internal combustion engine to the atmosphere.

A technique is known that covers the vicinity of the atmospheric open end of the tail pipe protruding from the muffler body from the outer peripheral side at the front part of the muffler cutter whose rear end is opened by a bumper cover (see, for example, Patent Document 1). .
JP 2005-313714 A JP 2003-63458 A JP 2004-196287 A JP 2004-308551 A JP 2006-281804 A JP 2006-316705 A

  However, the conventional technology as described above does not consider the thermal effect of the muffler body on the bumper cover.

  In view of the above facts, an object of the present invention is to obtain an exhaust outlet portion structure that can suppress the thermal influence on the bumper cover in a configuration in which the atmosphere opening end of the exhaust gas faces the bumper cover.

  The exhaust outlet structure according to the first aspect of the invention covers a portion including an air release end of a muffler outlet member projecting rearward from the muffler main body in the longitudinal direction of the vehicle body from the outer peripheral side at the front portion in the longitudinal direction of the vehicle body, and A cylindrical covering portion that opens toward the opening formed in the bumper cover with a rear end portion in the longitudinal direction of the vehicle body, and supports the tubular covering portion with respect to the vehicle body, and between the bumper cover and the muffler body. And a plate-like portion extending so as to face the rear end portion of the muffler body in the longitudinal direction of the vehicle body and the inner surface of the bumper cover in a non-contact manner.

  In the exhaust outlet structure according to claim 1, a portion including the atmosphere open end (rear end portion in the front-rear direction of the vehicle body) of the muffler outlet member is covered with a cylindrical covering portion, and heat from the muffler outlet member is Supply to the bumper cover (mainly radiation, heat transfer via air) is prevented or suppressed. Also, between the muffler main body and the bumper cover, a plate-like portion that is opposed to these extends in a non-contact manner, and heat from the muffler main body is supplied to the bumper cover (mainly via radiation and air) Heat transfer) is prevented or suppressed.

  Since the cylindrical covering portion is supported by the vehicle body via the plate-like portion, the cylindrical covering portion and the plate-like portion are not in contact with the muffler side (the muffler outlet member and the muffler main body) and the bumper cover, respectively. Or a light contact state. For this reason, the cylindrical covering portion and the plate-like portion are unlikely to be a heat transfer medium from the muffler outlet member and the muffler body to the bumper cover. By preventing or suppressing the heat supply to the bumper cover, the thermal influence on the bumper cover can be effectively suppressed.

  As described above, in the exhaust outlet portion structure according to the first aspect, in the configuration in which the air release end of the exhaust gas faces the bumper cover, the thermal influence on the bumper cover can be suppressed.

  According to a second aspect of the present invention, the exhaust outlet portion structure according to the first aspect is the exhaust outlet portion structure according to the first aspect, wherein the plate-like portion extends from the rear side of the vehicle body in the longitudinal direction of the vehicle body with a peripheral edge extending over the entire circumference. Projects outward from the peripheral edge of the main body.

  In the exhaust outlet portion structure according to claim 2, the plate-like portion has a size that makes the rear surface of the muffler main body face the entire surface except for the hole portion formed in the boundary portion with the cylindrical covering portion. The radiation path of the shortest distance from the muffler body to the bumper cover and the heat transfer path via the air are blocked by the plate-like portion, so that the thermal influence on the bumper cover can be more effectively suppressed.

  An exhaust outlet portion structure according to a third aspect of the invention is the exhaust outlet portion structure according to the first or second aspect, wherein the heat shield portion main body covers at least a portion including the rear end portion of the muffler main body, and the shield. An outer covering portion that is squeezed from the heat portion main body in a portion of the heat shield portion main body that covers the muffler main body and extends rearward in the vehicle body front-rear direction and covers at least the front end portion of the cylindrical covering portion from the outer peripheral side; Further provided.

  In the exhaust outlet structure according to claim 3, the heat shield main body that covers the muffler main body at least from the rear in the longitudinal direction of the vehicle body further effectively radiates radiation from the muffler main body to the bumper cover and heat transfer via air. Suppress. The outer covering portion extending from the heat shield portion main body covers at least the front end of the cylindrical covering portion from the outer peripheral side, so that the flow path (wraparound) of exhaust gas into the bumper cover is provided between the muffler outlet member and the cylinder. The labyrinth structure passes between the cylindrical covering portion and the outer covering portion by being folded twice. This effectively suppresses the exhaust gas and hot air from entering the bumper cover.

  As described above, the exhaust outlet portion structure according to the present invention has an excellent effect that the heat influence on the bumper cover can be suppressed in the configuration in which the atmosphere opening end of the exhaust gas faces the bumper cover.

  An exhaust outlet structure 10 according to a first embodiment of the present invention will be described with reference to FIGS. For convenience of explanation, the directions indicated by the arrows FR, UP, and W, which are appropriately shown in the drawings, are the forward direction (traveling direction), the upward direction, and the vehicle width of the vehicle to which the exhaust outlet structure 10 is applied, respectively. The direction.

  FIG. 1 shows the exhaust outlet portion structure 10 in a bottom sectional view, and FIG. 2 shows the exhaust outlet portion structure 10 in an exploded perspective view. As shown in these drawings, the exhaust outlet portion structure 10 is applied to an exhaust gas outlet portion in a vehicle exhaust system for purifying and silencing exhaust gas of an internal combustion engine and opening it to the atmosphere.

  Specifically, a main muffler 12 as a muffler body is provided at a downstream end portion in the exhaust gas flow direction in the vehicle exhaust system, and the main muffler 12 consumes the acoustic energy of the exhaust gas passing through the inside. The exhaust sound is muted. The main muffler 12 is disposed in the vicinity of the rear end of the vehicle body in the vicinity of the bumper cover 14 constituting the rear bumper. In this embodiment, the main muffler 12 includes an end plate 12A that is formed in a substantially flat plate shape and forms a rear end surface, and the end plate 12A is brought close to (opposed to) the bumper cover 14.

  From the end plate 12A of the main muffler 12, a tail pipe 16 as a muffler outlet member protrudes rearward in the vehicle longitudinal direction. The rear end portion of the tail pipe 16 is an atmospheric open end 16A for discharging exhaust gas. In this embodiment, an example in which two tail pipes 16 having a substantially cylindrical shape are provided is shown. The number of tail pipes 16 (single or three or more) may be selected as appropriate.

  As shown in FIG. 2, the bumper cover 14 is provided with a through-hole 18 that allows the atmospheric open end 16 </ b> A of the tail pipe 16 to face the outside of the rear bumper, that is, the rear of the vehicle body in a rear view. A plurality (two) of through holes 18 are independently formed corresponding to the plurality (two) of tail pipes 16.

  The exhaust outlet structure 10 includes a muffler finisher 20 interposed between the main muffler 12 and the tail pipe 16 and the bumper cover 14. The muffler finisher 20 is mainly composed of a cover pipe 22 as a cylindrical covering portion that has a cylindrical shape, and a base plate 24 that is formed in a flat plate shape and has the cover pipe 22 fixedly provided. Two cover pipes 22 are provided corresponding to the two tail pipes 16.

  As shown in FIG. 1, each cover pipe 22 covers a portion including the atmosphere open end 16 </ b> A in the tail pipe 16 corresponding to each front portion 22 </ b> A from the outer peripheral side. Supplementally, the positions of the main muffler 12 and the tail pipe 16 (relative positions with respect to the bumper cover 14 etc.) shown by solid lines in FIG. 1 are those at room temperature (internal combustion engine stop state). The front portion 22A of the pipe 22 covers a portion including the atmosphere open end 16A in the tail pipe 16 from the outer peripheral side. In FIG. 1, the imaginary lines indicate the main muffler 12 and the tail pipe 16 when the exhaust system is heated by the exhaust gas and thermally expanded.

  As for the cover pipe 22, the part including 22 A of front parts is made larger diameter than the rear part 22B. In this embodiment, the diameter is larger than that of the rear portion 22 </ b> B up to a portion located rearward of the position of the atmospheric open end 16 </ b> A in a thermally stretched state. In other words, the rear portion of the cover pipe 22 from the position of the atmospheric open end 16 </ b> A in the thermally stretched state is the rear portion 22 </ b> B. In the large diameter portion including the front portion 22A of the cover pipe 22, the distance along the radial direction between the inner peripheral surface of the cover pipe 22 and the outer peripheral surface of the tail pipe 16 is a distance at which the cover pipe 22 is not overheated (heated to a predetermined temperature or higher) The inner diameter is determined so that On the other hand, the inner diameter of the rear portion 22B has a design effect that makes it difficult to see the end face of the tail pipe 16 from the outside of the bumper cover 14.

  On the other hand, as shown in FIG. 1, the rear opening end 22 </ b> C of each cover pipe 22 has an annular rib 18 </ b> A formed at the peripheral edge of the through hole 18 in the bumper cover 14 so as to face the rear rear side of the vehicle body from the through hole 18. Located inside. Further, as shown in FIG. 1, a ring member 26 formed in a substantially annular shape is attached to the rear opening end 22 </ b> C of each cover pipe 22. The ring member 26 has a flange 26A projecting radially outward in front of the bumper cover 14. The ring member 26 has an annular rib 18A of the bumper cover 14 and a rear opening end of each cover pipe 22 in the rear view. The gap with 22C is hidden. In FIG. 1, the bumper cover 14 is illustrated in a plan view, but the bumper cover 14 may be formed in a curved surface shape. In this case, the shape of the rear opening end 22 </ b> C of each cover pipe 22 and the ring member 26 may be a shape along the curved surface shape of the bumper cover 14.

  As shown in FIG. 3A, in this embodiment, each cover pipe 22 is configured by a member different from the base plate 24. In this embodiment, each cover pipe 22 is made of a metal material, and the base plate 24 is made of a metal material. Each cover pipe 22 may be formed in a cylindrical shape by joining two members, for example.

  As shown in FIGS. 3A and 3B, the base plate 24 extends along the vehicle width direction and the vehicle body front-rear direction by being formed by bending the upper end of the flat plate backward. It has a substantially rectangular plate main body portion 28 and a flange portion 30 extending rearward from the upper end of the plate main body portion 28 in the longitudinal direction of the vehicle body. As shown in FIG. 1, both end portions 28 </ b> A in the vehicle width direction of the plate main body 28 protrude in the vehicle width direction from both end portions 12 </ b> B in the vehicle width direction of the main muffler 12 (end plate 12 </ b> A). Although not shown, both ends of the plate main body 28 in the vertical direction of the vehicle body protrude in the vehicle width direction from both ends 12B of the vertical direction of the vehicle body 12 (end plate 12A). The flange portion 30 extends over substantially the entire width of the plate main body portion 28.

  The plate main body 28 is formed with attachment holes 28B through which the cover pipes 22 are inserted independently of each other. An annular rib 28C extends from the peripheral edge of the mounting hole 28B in the plate main body 28 in the forward and backward direction of the vehicle body. The muffler finisher 20 is configured by joining the outer peripheral portion of the cover pipe 22 inserted through each mounting hole 28B and the annular rib 28C by welding or the like. Thereby, as described above, each cover pipe 22 is fixed to the base plate 24.

  At both ends of the flange portion 30 in the longitudinal direction (vehicle width direction), fastening holes 30A for fixing the base plate 24 to the vehicle body are formed. As shown in FIG. 1, the base plate 24, that is, the muffler finisher 20, has a fastener (bolt) 32 penetrating the fastening hole 30A formed on the vehicle body side member, so that a weld nut or the like fixed to the screw portion or the vehicle body side member, etc. And is fixed to the material on the side of the vehicle body. The vehicle body side member may be, for example, a rear cross member or a floor panel.

  Next, the operation of the first embodiment will be described.

  In the exhaust outlet structure 10 having the above-described configuration, the main muffler 12 and the tail pipe 16 are covered with the bumper cover 14, so that the appearance of the applied automobile can be improved. In particular, by forming the rear portion 22B of the cover pipe 22 into a throttle shape, the end face (atmospheric open end 16A) can be effectively hidden from the tail pipe 16, and the appearance can be further improved.

  In the exhaust outlet structure 10, the exhaust gas of the internal combustion engine discharged from the atmosphere open end 16 </ b> A via the main muffler 12 and the tail pipe 16 further passes through the cover pipe 22 and is discharged from the through hole 18. .

  Here, in the exhaust outlet portion structure 10, since the portion including the atmospheric open end 16 </ b> A of the tail pipe 16 is covered with the cover pipe 22, heat from the tail pipe 16 (mainly radiation and heat via air). It is prevented or suppressed that heat due to transmission) has a thermal effect on the bumper cover 14. That is, the heat from the tail pipe 16 is blocked by the cover pipe 22 from being transmitted in the direction of arrow A shown in FIG. Further, a base plate 24 that is opposed to the end plate 12A and the bumper cover 14 of the main muffler 12 is extended in a non-contact manner, and heat from the main muffler 12 (end plate 12A) is absorbed by the bumper cover. 14 is prevented or suppressed. That is, the heat from the main muffler 12 is blocked by the cover pipe 22 from being transmitted in the direction of arrow B shown in FIG.

  In the exhaust outlet structure 10, since the cover pipe 22 is supported by the vehicle body via the base plate 24, the muffler finisher 20 including the cover pipe 22 and the base plate 24 is connected to the muffler side (end plate). 12A and the tail pipe 16) and the bumper cover 14 can be brought into a non-contact or light contact state (high contact thermal resistance).

  Thereby, the muffler finisher 20 is unlikely to be a heat transfer medium from the end plate 12A or the tail pipe 16 to the bumper cover 14. That is, for example, in the configuration in which the cover pipe 22 is fixed (supported) to the tail pipe 16, the cover pipe 22 becomes high temperature due to heat transfer from the tail pipe 16. 14 will be affected. On the contrary, in the structure in which the cover pipe 22 is fixed to the bumper cover 14, even if the temperature rise of the cover pipe 22 itself is suppressed to the same extent as the exhaust outlet portion structure 10, the bumper cover is thermally transferred from the cover pipe 22. Since a large amount of heat moves to 14, the bumper cover 14 is affected by heat.

  On the other hand, since the muffler finisher 20 is supported by the vehicle body in the exhaust outlet structure 10, the exhaust outlet structure 10 can significantly suppress the heat supply to the bumper cover 14 due to heat transfer. For this reason, in the exhaust outlet portion structure 10, the heat supply to the bumper cover 14 due to the heat from the end plate 12 </ b> A and the tail pipe 16 or the heat transfer through the air is prevented or suppressed as described above. The heat influence can be effectively suppressed.

  For example, in the comparative example shown in FIGS. 7A and 7B, the cover pipe 100 corresponding to the cover pipe 22 covers the portion including the atmosphere open end 16A of the tail pipe 16, and the cover pipe 100 is It is attached to the vehicle body via the bracket 102. Thereby, in this comparative example, although heat transfer through the cover pipe 100, radiation in the direction of arrow A from the tail pipe 16 to the bumper cover 14, and heat transfer through the air are suppressed, the bumper cover from the end plate 12A is suppressed. The bumper cover 14 is influenced by heat due to radiation in the direction of arrow B to 14 and heat transfer via air. On the other hand, in the exhaust outlet portion structure 10, the base plate 24 that supports the cover pipe 22 on the vehicle body is interposed between the end plate 12A and the bumper cover 14 in a non-contact manner, so that radiation and air in the direction of arrow B are interposed. Heat transfer can be effectively suppressed. In particular, each end in the vehicle width direction and the vertical direction of the vehicle body of the plate main body 28 constituting the base plate 24 projects outward from the corresponding end of the main muffler 12 (end plate 12A). Heat transfer can be effectively suppressed (the radiation path of the shortest distance and the heat transfer path via air are reliably blocked by the plate body 28).

  Therefore, in the exhaust outlet portion structure 10, the thermal influence on the bumper cover 14 can be greatly reduced as compared with the comparative example shown in FIG. Conversely, the main muffler 12 can be disposed close to the bumper cover 14 as compared with the configuration shown in FIG. 7, and the degree of freedom of installation of the exhaust system is improved.

  As described above, in the exhaust outlet portion structure 10 according to the first embodiment, the heat influence on the bumper cover 14 can be suppressed in the configuration in which the atmosphere opening end 16A of the exhaust gas faces the bumper cover 14.

  Further, in the exhaust outlet structure 10, since the base plate 24, that is, the muffler finisher 20 is fixed to the vehicle body at both longitudinal ends of the flange portion 30, the thermal expansion of the plate main body portion 28 in the vehicle width direction is suppressed. As a result, the center of the cover pipe 22 with respect to the tail pipe 16, that is, a portion where the radial distance between the tail pipe 16 and the cover pipe 22 is locally small (part where heat transfer is likely to occur) occurs in a part of the circumferential direction. Is suppressed.

  Next, another embodiment of the present invention will be described. Note that parts or portions that are basically the same as those in the first embodiment or the above-described configuration are denoted by the same reference numerals as those in the first embodiment or the previous configuration, and the description thereof is omitted. May be omitted.

(Second Embodiment)
FIG. 4 is a side sectional view showing an exhaust outlet structure 40 according to a second embodiment of the present invention. As shown in this figure, the exhaust outlet portion structure 40 is different from the exhaust outlet portion structure 10 according to the first embodiment in that it additionally includes a heat insulator 42 that covers the main muffler 12.

  The heat insulator 42 covers the entire main muffler 12 or the rear part of the main muffler 12 including at least the end plate 12A in a separated state. Thereby, a heat insulation air layer is formed between the surface of the main muffler 12 and the heat insulator 42. The heat insulator 42 is supported by the main muffler 12 through, for example, a heat insulating material, or is supported by the vehicle body independently of the muffler finisher 20.

  From the rear wall portion 42A that covers the end plate 12A of the heat insulator 42, an outer cover portion 44 that extends as a cylindrical outer covering portion that is narrower than the heat insulator 42 extends rearward. The outer cover portion 44 covers at least a portion (a part or all of the front portion 22A) including the front end portion 22D of the cover pipe 22 from the outer peripheral side. Although illustration is omitted, the same number of outer cover portions 44 may be provided corresponding to the plurality of cover pipes 22 and formed so as to cover the plurality of cover pipes 22 together (for example, formed into a gourd shape). Also good.

  In this embodiment, a retainer 46 fixed to the plate main body 28 is additionally provided. The retainer 46 is configured by extending a flange 46B from the rear end of the cylindrical portion 46A that allows the rear end portion 44A of the outer cover portion 44 to be inserted in a non-contact manner. It is fixed.

  As described above, in the exhaust outlet portion structure 40, the flow path P <b> 1 between the tail pipe 16 and the cover pipe 22, the cover pipe 22, the outer cover portion 44, A maze structure M is formed in which the flow path P2 between them and the flow path P3 between the outer cover portion 44 and the retainer 46 are communicated in a staggered manner (see arrow C in FIG. 4).

  The other structure in the exhaust outlet part structure 40 is the same as the corresponding structure of the exhaust outlet part structure 10 including the part which is not shown in figure.

  Therefore, also by the exhaust outlet part structure 40 according to the second embodiment, the same effect can be obtained by the same operation as in the first embodiment. In addition, since the exhaust outlet portion structure 40 includes the heat insulator 42, radiation from the main muffler 12 (end plate 12A) and heat transfer via air can be more effectively suppressed. For this reason, in the exhaust outlet part structure 40, you may comprise the plate main-body part 28 smaller than the end plate 12A by back view.

  Further, in the exhaust outlet portion structure 40, the labyrinth structure M is formed outside the tail pipe 16. In other words, the exhaust gas circulatory channel becomes complicated as indicated by the arrow C and heat is transferred. A plurality of air layers are interposed in the path, and the exhaust gas and heat (hot air) can be effectively prevented from entering the rear bumper (in front of the bumper cover 14). As a result, the intrusion of exhaust odor into the passenger compartment is also suppressed.

(Third embodiment)
FIG. 5 is a side sectional view showing an exhaust outlet structure 50 according to a third embodiment of the present invention. As shown in this figure, the exhaust outlet portion structure 50 includes a muffler finisher 52 in which each part is integrally formed instead of the muffler finisher 20 to which the cover pipes 22 and the base plate 24 fixed to each other are fixed. This is different from the exhaust outlet portion structure 10 according to the first embodiment.

  As shown in FIGS. 5 and 6, the muffler finisher 52 includes a common duct portion 54 as a cylindrical covering portion that covers at least a portion including the atmosphere open end 16 </ b> A of the two tail pipes 16 from the outer peripheral side, and a common duct. Two substantially cylindrical pipe-shaped portions 56 that are provided independently of the rear wall 54A of the portion 54 are integrally formed. In this embodiment, in the muffler finisher 52, the common duct portion 54 and the two pipe-like portions 56 are integrally formed as described above by drawing a metal material. The pipe-like portion 56 is formed in substantially the same shape as the rear portion 22B of the cover pipe 22.

  In this embodiment, the rear wall 54A of the common duct portion 54 corresponds to a plate-like portion in the present invention. The other structure in the exhaust outlet part structure 40 is the same as the corresponding structure of the exhaust outlet part structure 10 including the part which is not shown in figure.

  Therefore, also by the exhaust outlet part structure 50 according to the third embodiment, the same effect can be obtained by the same operation as in the first embodiment.

  In each of the above-described embodiments, an example in which the muffler finishers 20 and 52 are made of a metal material is shown. However, the present invention is not limited to this, and for example, the muffler finishers 20 and 52 are heat-resistant resin agents. It may be constituted by. In this case, the shape of the muffler finisher 20 can be obtained by integral molding of resin.

1 is a bottom cross-sectional view illustrating an exhaust outlet structure according to a first embodiment of the present invention. It is a disassembled perspective view of the exhaust outlet part structure which concerns on the 1st Embodiment of this invention. It is a figure which shows the muffler finisher which comprises the exhaust outlet part structure which concerns on the 1st Embodiment of this invention, Comprising: (A) is a disassembled perspective view, (B) is a perspective view. It is side surface sectional drawing which shows the exhaust outlet part structure which concerns on the 2nd Embodiment of this invention. It is bottom sectional drawing which shows the exhaust outlet part structure which concerns on the 3rd Embodiment of this invention. It is a perspective view which shows the muffler finisher which comprises the exhaust outlet part structure which concerns on the 3rd Embodiment of this invention. It is a figure which shows the exhaust-gas outlet part structure which concerns on the comparative example with embodiment of this invention, Comprising: (A) is bottom sectional drawing, (B) is back sectional drawing.

Explanation of symbols

10 Exhaust outlet structure 12 Main muffler (muffler body)
14 Bumper cover 16 Tail pipe (muffler outlet member)
16A Atmospheric open end 18 Through hole (bumper cover opening)
22 Cover pipe (cylindrical coating)
24 Base plate (plate part)
40/50 Exhaust outlet structure 42 Heat insulator (heat shield body)
44 Outer cover (outer cover)
54 Common duct (tubular covering)
54A Rear wall (plate-shaped part)

Claims (3)

A portion including the air release end of the muffler outlet member protruding rearward from the muffler body in the vehicle longitudinal direction is covered from the outer peripheral side at the front portion in the vehicle longitudinal direction, and the rear end in the vehicle longitudinal direction is formed on the bumper cover. A cylindrical covering that opens to face the opening;
The cylindrical covering portion is supported with respect to the vehicle body and is opposed to the rear end portion of the muffler body in the longitudinal direction of the vehicle body and the inner surface of the bumper cover between the bumper cover and the muffler body. A plate-like portion extending to
Exhaust outlet part structure equipped with.   2. The exhaust outlet structure according to claim 1, wherein the plate-like portion has a peripheral portion that protrudes outward from a peripheral portion of the muffler main body over the entire periphery when viewed from the rear side in the vehicle longitudinal direction. A heat shield body that covers at least the rear end of the muffler body; and
An outer covering that extends from the heat shield portion main body in the front-rear direction of the vehicle body and extends rearward in the vehicle body front-rear direction so as to be narrower than the portion of the heat shield portion main body that covers the muffler main body. And
The exhaust outlet structure according to claim 1 or 2, further comprising:

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