JP2010254256A - Rear structure of vehicle - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a rear structure of a vehicle, which allows a diffuser to be hardly damaged when the vehicle gets rear-ended, and thereby reduces a repairing cost. <P>SOLUTION: A diffuser 50 through which exhaust gas from a muffler pipe 7 is discharged is mounted to a rear bumper 100; the front end 10A of the diffuser 50 is arranged below a back panel 71, and is protruded toward a vehicle front side Fr beyond the back panel 71; the muffler pipe 7 is inserted into the diffuser 50; and the interval d2 in the vehicle front-back direction between the front end 10A1 of the diffuser 50 and the rear surface 78 of a muffler body 75 on the vehicle rear side Rr, is set longer than the protruded length e1 of the diffuser 50 from the front side panel surface 71A of the back panel 71. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

The present invention
A muffler having a muffler body and a muffler pipe projecting from the rear surface of the muffler body on the vehicle rear side is provided.
The present invention relates to a rear structure of a vehicle in which a diffuser for passing exhaust gas from the muffler pipe and exhausting it is attached to a rear bumper.

In a vehicle, an exhaust port is generally arranged below the rear bumper to exhaust exhaust gas from the internal combustion engine to the rear side of the vehicle. However, the rear bumper is enlarged and the rear bumper is positioned below. In a designed vehicle or the like, a through hole is provided in a rear bumper and a muffler pipe is inserted through the through hole.
Thus, in a vehicle in which the muffler pipe is inserted into the through hole of the rear bumper, the through hole has to be large because the muffler pipe vibrates with respect to the rear bumper fixed to the vehicle body in a stationary state. Since the muffler pipe protrudes, the appearance is likely to deteriorate. Further, since the muffler pipe becomes hot, there is a possibility that the resin-made rear bumper which is weak against heat is deteriorated or discolored.
As a countermeasure, a metal diffuser with a well-designed design is installed in the hole of the rear bumper, the opening of the muffler pipe that opens on the back side of the rear bumper is wrapped with the diffuser, and the exhaust is discharged through the diffuser.

  Conventionally, in the rear structure of the vehicle described above, as disclosed in Patent Document 1, the front end portion of the diffuser has been disposed below and below the back panel.

JP 2008-143199 A

When the rear bumper of the vehicle is pushed to the front side of the vehicle by the load applied from the rear and moves to the front side of the vehicle, the diffuser similarly moves to the front side of the vehicle. According to the conventional structure, the front end portion of the diffuser is disposed below and below the back panel, so that the front end portion of the diffuser may collide with the back panel and be damaged.
The diffuser is made of, for example, stainless steel, and is an expensive part whose surface is buffed to improve its design.If the diffuser is damaged and replaced with a new diffuser as described above, the repair cost is high. There was a problem of becoming higher.
The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a rear structure of a vehicle that makes it difficult to damage the diffuser when the vehicle receives a load from the rear and can reduce repair costs. There is in point to do.

The feature of the present invention is that
A muffler having a muffler body and a muffler pipe projecting from the rear surface of the muffler body on the vehicle rear side is provided.
A rear structure of a vehicle in which a diffuser for passing exhaust gas from the muffler pipe and exhausting the exhaust gas is attached to a rear bumper,
The front end portion of the diffuser is disposed below the back panel and protrudes to the vehicle front side than the back panel,
The muffler pipe is inserted into the diffuser. (Claim 1)

  According to this configuration, since the front end portion of the diffuser is disposed below the back panel and protrudes forward of the vehicle from the back panel, and the muffler pipe is inserted into the diffuser, the diffuser together with the rear bumper is applied by the load applied from the rear. Even if it moves to the vehicle front side, the front end portion of the diffuser does not collide with the back panel from the vehicle rear side, and damage to the diffuser can be avoided. (Claim 1)

In the present invention,
If the distance between the front end of the diffuser and the rear surface of the muffler body in the vehicle rear direction is set longer than the length of the diffuser protruding from the front panel surface of the back panel, the distance is increased. The amount of movement of the diffuser to the vehicle front side when moving to the vehicle front side under a load can be increased so that the front end of the diffuser does not easily collide with the rear surface of the muffler body on the vehicle rear side. This can make it easier to avoid damage to the diffuser. (Claim 2)

In the present invention,
In rear view of the vehicle, the lower end edge of the rear bumper is overlapped with the muffler body,
If the lower end edge of the rear bumper is projected forward of the vehicle from the front end of the diffuser, the lower end edge of the rear bumper is attached to the muffler body before the front end of the diffuser when the rear bumper moves to the front side of the vehicle under load. Since it abuts, the front end of the diffuser can be prevented from abutting against the muffler body, and damage to the diffuser can be avoided. (Claim 3)

In the present invention,
A muffler pipe projecting from the muffler body is formed in a straight line, and when the rear end of the muffler pipe is located inside the inner periphery of the diffuser as viewed from the rear of the vehicle, the rear bumper receives the load and the rear bumper The rear end of the muffler pipe can easily pass through the diffuser when moving to the center, avoiding interference between the rear end of the muffler pipe and the inner periphery of the diffuser and avoiding damage to the diffuser be able to. (Claim 4)

In the present invention,
A front end portion of the diffuser is disposed in a notch formed by cutting out an end portion in the vehicle width direction of a lower end portion of the back panel, and the front end portion of the diffuser protrudes toward the vehicle front side from the back panel. If so, the modification of the back panel for projecting the front end portion of the diffuser to the front side of the vehicle from the back panel can be kept small, and the manufacturing cost can be reduced. Further, the arrangement of the diffuser and the muffler pipe is facilitated, and the diffuser and the muffler pipe can be arranged at a relatively high position. (Claim 5)

In the present invention,
When the rear end portion of the diffuser is inserted into the opening formed in the rear bumper, the diffuser can be stably supported by the rear bumper. (Claim 6)

According to the present invention,
It has been possible to provide a rear structure of a vehicle that makes it difficult for the diffuser to be damaged when the vehicle receives a load from the rear, thereby reducing repair costs.

Disassembled perspective view of rear bumper Perspective view of diffuser as seen from diagonally forward Perspective view of diffuser viewed from diagonally forward A perspective view of the rear bumper before installing the diffuser as seen from the front of the vehicle The perspective view seen from the vehicle front side which shows the state which attached the diffuser to the rear bumper View of the diffuser from the rear of the vehicle (rear view) (A) is AA sectional drawing of FIG. 1, (b) is an exploded sectional view which shows the structure of the 1st diffuser side attaching part. BB sectional view of FIG. (A) is CC sectional drawing of FIG. 1, (b) is an exploded sectional view which shows the structure of the 1st diffuser side attaching part. DD sectional view of FIG. View of the back panel as seen from the rear of the vehicle Perspective view showing back panel and diffuser Cross section showing back panel and diffuser

Hereinafter, embodiments for carrying out the present invention will be described with reference to the drawings.
1 and 10, an muffler 80 for an internal combustion engine including a muffler main body 75 and a straight tubular (straight-line) muffler pipe 7 protruding from a vertical rear surface 78 on the vehicle rear side Rr of the muffler main body 75 is provided. The rear structure of the vehicle is shown in which a pair of left and right metal diffusers 50 that allow exhaust gas from the muffler pipe 7 to pass therethrough are attached to the opening 1 of the resin rear bumper 100.

[Structure of rear bumper 100]
The rear bumper 100 includes a rear surface portion 2 along the left-right direction and a pair of left and right side portions 3 extending from the left and right ends of the rear surface portion 2 to the vehicle front side Fr. The rear surface portion 2 is formed in a gentle arc shape that is slightly convex on the vehicle rear side Rr in the transverse section and the longitudinal section, and the corner portion 4 formed by the rear surface portion 2 and the side surface portion 3 is formed in an arc shape in the transverse section and the longitudinal section. Is formed. The opening 1 is formed in the left and right ends at the left and right end portions of the rear surface portion 2 so as to extend from side to side. The rear bumper 100 is formed with an inner peripheral wall 99 (see FIG. 8) that rises from the rear bumper portion around the opening 1 to the vehicle front side Fr over the entire periphery of the opening 1.

[Structure of diffuser 50]
As shown in FIGS. 2, 3, and 8, the diffuser 50 includes a cylindrical diffuser main body 10 and an annular garnish 11 fixed to the end of the diffuser main body 10 on the vehicle rear side Rr. . The diffuser main body 10 has a cylindrical front half (diffuser main body portion) on the vehicle front side Fr that expands in the left-right direction (slightly increases in diameter) as it goes to the vehicle rear side Rr. The diffuser main body portion) increases in diameter in the left-right direction and the up-down direction (largely increases in diameter) as it goes to the vehicle rear side Rr.

  More specifically, the diffuser main body 10 includes an upper semi-cylindrical upper panel 14 (long circular arc with an open bottom in the longitudinal section) and a lower semi-cylindrical lower panel 15 (long arc with an open upper section in the vertical section). . The upper panel 14 is provided with flanges 14F projecting to the left and right outer sides at the lower left and right ends, and the lower panel 15 is provided with flanges 15F projecting to the left and right outer sides at the upper left and right ends.

  Each flange 14F, 15F is formed over substantially the entire length of the upper panel 14 or the lower panel 15 in the vehicle front-rear direction. Then, the pair of left and right flanges 14F of the upper panel 14 and the pair of left and right flanges 15F of the lower panel 15 are overlapped and welded together in the vertical direction.

  Thus, since the diffuser main body 10 is configured as a joint structure of the upper panel 14 and the lower panel 15, the above shape can be easily formed, and the diffuser main body 10 can be easily configured as a cylindrical body having the above shape. it can. As shown in FIG. 8, the end portions 14B and 15B of the upper panel 14 and the lower panel 15 on the vehicle rear side Rr are formed in a stepped shape with an enlarged diameter.

  The muffler pipe 7 is inserted into the front end portion of the cylinder body of the diffuser main body 10 from the vehicle front side Fr, and the outer peripheral surface of the muffler pipe 7 and the cylinder body so as not to contact the front half portion of the cylinder body due to vibration of the muffler pipe 7 A relatively large space is provided between the inner peripheral surface of the front end portion.

[Structure of garnish 11]
The garnish 11 is an annular member that decorates the opening end of the diffuser 50 on the vehicle rear side Rr. As shown in FIG. 8, the garnish 11 is formed in a vertical cross-sectional U shape with the vehicle front side Fr open over the entire circumference, and is positioned with an interval from the inner peripheral wall 61 and the inner peripheral wall 61. The outer peripheral wall 60 and the connection part 62 which connects the inner and outer peripheral walls 61 and 60 are provided. The design surface on the vehicle rear side Rr of the garnish 11 is inclined in a curved shape so as to be positioned on the vehicle front side Fr toward the vehicle width direction outer side.

  Further, the end 61A of the inner peripheral wall 61 on the vehicle front side Fr is the end of the diffuser main body 10 on the rear side Rr of the diffuser main body 10 (the ends 14B and 15B of the upper panel 14 and the lower panel 15 on the rear side Rr of the vehicle that are enlarged). ). This smoothes the flow of exhaust and improves the appearance.

  An end 60A of the outer peripheral wall 60 on the vehicle front side Fr is located in the opening 1 of the rear bumper 100, and a radial direction of the opening 1 is formed on the inner peripheral wall 99 on the rear bumper 100 side rising from the rear bumper portion around the opening 1 to the vehicle front side Fr. It is close from the inward side.

[Attachment structure of diffuser to rear bumper]
As shown in FIGS. 2, 3, 7 (a), 7 (b), 9 (a), and 9 (b), a mounting bolt that protrudes toward the vehicle front side Fr from the diffuser 50 is shown. A pair of left and right first diffuser-side attachment portions 21 provided with B1 (stud bolts) and a second diffuser-side attachment portion 22 provided with nuts N whose axis is along the vertical direction are provided.
4 and 8, the rear bumper 100 has a pair of left and right first rear bumper side mounting portions 31 provided with a bolt insertion hole S in which the axis O extends along the vehicle longitudinal direction, and the axis O is in the vertical direction. And a second rear bumper side mounting portion 32 provided with a bolt insertion hole S along.

Then, the mounting bolt B1 of the first diffuser-side mounting portion 21 is inserted into a bolt insertion hole S (specifically, a bush 35 described later) of the first rear bumper-side mounting portion 31, and a nut N is screwed to the mounting bolt B1. The first diffuser side attachment portion 21 is attached to the first rear bumper side attachment portion 31.
Further, as shown in FIGS. 5 and 8, the mounting bolt B1 is inserted from below into the bolt insertion hole S of the second rear bumper side mounting portion 32 and screwed into the nut N of the second diffuser side mounting portion 22. The second diffuser side attachment portion 22 is attached to the second rear bumper side attachment portion 32.

[Structure of first diffuser side attachment portion 21 on the vehicle width direction outer side (vehicle side side)]
As shown in FIGS. 2, 3, 7 (a), and 7 (b), the first diffuser side mounting portion 21 on the outer side in the vehicle width direction of the pair of left and right first diffuser side mounting portions 21 is an upper panel. The rear end portion (end portion on the vehicle rear side Rr) of the outer flange 14F in the vehicle width direction of 14 and the rear end portion (end portion on the vehicle rear side Rr) of the flange 15F on the outer side in the vehicle width direction of the lower panel 15 are integrated. Is formed.

  That is, both flanges 14F and 15F extend in a rectangular shape outward in the vehicle width direction and overlap each other, and the extending portions that overlap each other are bent upward to form a mounting surface portion 23 facing the vehicle longitudinal direction. The attachment bolt B1 is passed through the attachment surface portion 23 from the vehicle rear side Rr, and the head of the attachment bolt B is welded to the attachment surface portion 23. The attachment surface portion 23 is positioned substantially perpendicular to the vehicle longitudinal direction.

  In this way, the first diffuser side mounting portion 21 on the outer side in the vehicle width direction is formed by the flange 14F on the outer side in the vehicle width direction of the upper panel 14 and the flange 15F on the outer side in the vehicle width direction of the lower panel 15 without using a separate bracket. Therefore, the number of parts can be reduced. In addition, it can be used to align the upper panel 14 and the lower panel 15, and productivity can be improved.

[Structure of first diffuser-side mounting portion 21 on the inner side in the vehicle width direction (vehicle center side)]
As shown in FIGS. 2, 3, 9 (a) and 9 (b), the first diffuser side mounting portion 21 on the inner side in the vehicle width direction is an end portion 14 </ b> B whose diameter is increased on the vehicle rear side Rr of the upper panel 14. The leg portions 25 of the brackets 24 having a "<" shape as seen from the vehicle front-rear direction are welded to the upper surface of the lower panel 15 and the side surface of the enlarged end portion 15B on the vehicle rear side Rr of the lower panel 15, respectively. The mounting bolt B1 is penetrated and fixed to.

  The bracket 24 is formed in a single plate shape whose plate surface faces the vehicle front-rear direction, and mounting flanges 25F are bent at both leg portions 25, respectively. The mounting flange 25F is overlapped and welded to the upper surface of the enlarged end portion 14B of the upper panel 14 on the vehicle rear side Rr and the side surface of the enlarged end portion 15B of the lower panel 15 on the vehicle rear side Rr. . Thereby, a long attachment distance (attachment distance between both leg portions 25 of the bracket 24) is ensured to form a rigid attachment surface.

  A bracket portion between the two leg portions 25 is formed on a mounting surface portion 26 with respect to the rear bumper 100. A mounting bolt B1 penetrates the mounting surface portion 26 from the vehicle rear side Rr, and a head of the mounting bolt B1 is welded to the mounting surface portion 26. Yes.

  For example, in a structure in which the bracket 24 is formed to be thin and long, the amount of heat transfer from the bracket 24 to the rear bumper 100 is suppressed, and the heat transfer path is set to be long, it is difficult to secure the mounting rigidity for the first rear bumper side mounting portion 31. Become. On the other hand, in the present invention, a relatively short (small) bracket is used to secure the mounting rigidity and only the welded portion is contacted so that the contact area between the diffuser body 10 and the bracket 24 (heat input portion). The cooling performance is improved.

[Structure of second diffuser-side attachment portion 22]
As shown in FIGS. 2, 3, and 8, the second diffuser-side attachment portion 22 is formed in a crank shape when viewed from the side of the vehicle (the left and right outer sides of the vehicle), and the front of the lower panel 15 in the vehicle. An upper mounting piece 27 attached to the lower surface of the end portion 15A of the side Fr, a vertical wall portion 28 extending downward from the upper attachment piece 27 and positioned substantially perpendicular to the vehicle longitudinal direction, and a lower end of the vertical wall portion 28 And a lower attachment piece 29 that extends horizontally from the front portion to the vehicle front side Fr and is attached to the attachment surface portion 40 (see FIG. 4) of the second rear bumper side attachment portion 32.

  The upper mounting piece 27, the vertical wall portion 28, and the lower mounting piece 29 are all formed in a cross-sectional hat shape, and the pair of left and right upper flanges 27F of the upper mounting piece 27 are end portions of the lower panel 15 on the vehicle front side Fr. It is superposed on the lower surface of 15A and welded. As a result, a traveling wind flow path R (see FIG. 8) is formed between the lower surface of the end portion 15A on the vehicle front side Fr of the lower panel 15 and the main body portion 27H of the upper mounting piece 27 facing the lower surface. Yes. Accordingly, the second diffuser-side attachment portion 22 can be cooled by the traveling wind flowing through the flow passage R.

  A bolt insertion hole S is formed at the center of the main body portion 29H of the lower attachment piece 29, and a nut N is welded and joined to the upper surface of the main body portion 29H in a concentric manner with the bolt insertion hole S.

  The second diffuser-side attachment portion 22 is attached to a portion of the diffuser 50 where the temperature is relatively high. However, the second diffuser-side attachment portion 22 is disposed at a position where the traveling wind is easily received and is opposed to the traveling wind. The traveling wind can be easily captured by being formed in a cross-sectional hat shape opened to the front side Fr of the vehicle. Furthermore, since it has a structure in which the traveling wind flows through the flow passage R, it is easily cooled by the traveling wind of the vehicle. Further, since the rear bumper 100 is located on the lower end side and is in a position where deterioration or discoloration of the rear bumper 100 is not noticeable even if it is affected by heat, the second diffuser side mounting portion 22 is not provided with a heat shield member. .

[Structure of first rear bumper side mounting portion 31]
As shown in FIGS. 4, 5, 7 (a), 7 (b), 9 (a), and 9 (b), the first rear bumper side mounting portion 31 is connected to the vehicle from the opening 1 of the rear bumper 100. It is formed to be offset to the front side Fr so as to connect the peripheral edges of the upper and lower opening portions at the left and right end positions of the opening 1. That is, the peripheral wall 33 that extends along the left and right ends of the opening 1 of the rear bumper 100 in the vehicle front-rear direction is erected from the peripheral portion of the opening 1 toward the vehicle front side Fr, and the end of the peripheral wall 33 on the vehicle front side Fr. A mounting surface portion 34 extending from the portion to the radially inward side of the opening 1 is formed substantially perpendicular to the vehicle front-rear direction, and a bolt insertion hole S in which the radially inner side is cut is formed in the mounting surface portion 34. It is. The notch 38 of the bolt insertion hole S facilitates the assembly of the bush 35 as will be described later, and improves the assembly workability. Further, since this notch is formed in the direction of the other first rear bumper side attaching portion 31, the bush 35 cannot be pulled out from the notch 38 after the diffuser 50 is attached.

  Between the first rear bumper side mounting portion 31 and the mounting bolt B of the first diffuser side mounting portion 21, it has heat resistance higher than that of the material (resin material) of the rear bumper 100, and the thermal conductivity is that of the diffuser 50. A heat-resistant rubber bush 35 is interposed as a heat shield member smaller than the ratio.

  The bush 35 includes an inner peripheral surface of the bolt insertion hole S of the first rear bumper side attachment portion 31 and an attachment surface of the first rear bumper side attachment portion 31 around the bolt insertion hole S (an attachment surface of the attachment surface portion 34). A fitting groove 36 that fits between 31M and the rear surface 31N of the first rear bumper side mounting portion 31 opposite to the mounting surface 31M is provided on the outer peripheral portion. Further, a metal cylindrical collar 37 (spacer) is fitted into the bush 35. The bush 35 is inserted into the bolt insertion hole S through the notch 38 from the lateral direction, and the mounting bolt B1 is inserted into the collar 37 in the bush 35. Since the bush 35 is inserted through from the lateral direction through the notch 38, the fitting groove 36 can be formed deeply to prevent falling off, and the first rear bumper side mounting portion 31 and the first diffuser. Since the area of the bush 35 between the side attachment portion 21 can be increased, the heat shielding performance and durability of the bush 35 can be improved.

The deformation of the bush 35 can be suppressed by the collar 37, and the tightening axial force of the mounting bolt B1 can be ensured. If the stepped mounting bolt B1 is used instead of the mounting bolt B1, the collar 37 can be eliminated and the number of parts can be reduced.
A mounting surface (mounting surface of the mounting surface portion 34) 31M of the first rear bumper side mounting portion 31 is formed substantially perpendicular to the vehicle longitudinal direction. Further, a stepped attachment seat surface is formed on the back surface 31N.

As shown in FIGS. 7, 9 (a), and 9 (b), the garnish 11 provided in the first rear bumper side mounting portion 31, the first diffuser side mounting portion 21, and the diffuser 50 in order from the vehicle front side Fr. The first rear bumper side mounting portion 31 and the first diffuser side mounting portion 21 are covered with the peripheral portion of the garnish 11 when viewed from the vehicle rear side Rr.
As a result, the traveling wind having a low temperature before being heated by the peripheral portion of the garnish 11 or the first diffuser-side attachment portion 21 hits the first rear bumper-side attachment portion 31 from the front side of the vehicle, and the first rear bumper-side attachment portion 31 is sufficiently covered. It can cool and can prevent deterioration and discoloration of the rear bumper 100. And since the clearance gap between the inner peripheral wall 99 of the opening 1 of the rear bumper 100 and the garnish 11 is formed, a driving | running | working wind will flow to the back of a vehicle through this clearance gap, and the garnish 11 can be cooled. The heat influence on the inner peripheral wall 99 can be reduced.
In addition, the traveling wind is received by the shape of the first rear bumper side mounting portion 31 and the traveling wind flows in the vicinity of the first diffuser side mounting portion 21, so that the first diffuser side mounting portion 21 can be cooled. In addition, the thermal influence on the rear bumper 100 can be reduced.

[Structure of second rear bumper side mounting portion 32]
As shown in FIGS. 4 and 8, the second rear bumper side mounting portion 32 has a horizontal mounting surface portion 40 formed in a step shape on the vehicle front side Fr portion of the lower end portion of the rear bumper 100, and bolts are inserted into the mounting surface portion 40. A hole S is provided.

[Assembly method]
The diffuser 50 is assembled to the rear bumper 100 as follows before the rear bumper 100 is mounted on the vehicle body.
(1) The diffuser 50 is inserted into the opening 1 of the rear bumper 100 from the vehicle rear side Rr, and the mounting bolt B1 of the first diffuser side mounting portion 21 is inserted into the collar 37 in the bush 35 of the first rear bumper side mounting portion 31. .
The mounting bolt B <b> 1 has a length to be inserted into the collar 37 in the bush 35 before the garnish 11 of the diffuser 50 disposed close to the opening 1 is inserted into the opening 1.
Thus, after the mounting bolt B1 is inserted into the collar 37, the position of the diffuser 50 is determined with respect to the opening 1 of the rear bumper 100. Accordingly, it is possible to avoid the diffuser 50 from colliding with the design surface of the rear bumper 100 during the assembling work, and damage to the design surface of the rear bumper 100 can be avoided.
(2) The nut N is screwed onto the mounting bolt B1, and the first diffuser-side mounting portion 21 is mounted on the first rear bumper-side mounting portion 31. Further, as shown in FIGS. 5 and 8, the mounting bolt B1 is inserted from below into the bolt insertion hole S of the second rear bumper side mounting portion 32 and screwed into the nut N of the second diffuser side mounting portion 22. The second diffuser side attachment portion 22 is attached to the second rear bumper side attachment portion 32.

[Wind flow]
A traveling wind blows into the interior of the rear bumper 100 as the automobile travels, and the interior of the rear bumper 100 is in a high-pressure state with respect to the rear side of the rear bumper 100. A part of the air inside the rear bumper 100 passes through the diffuser 50 together with the exhaust gas, and the exhaust air temperature and the temperature inside the diffuser 50 are lowered to be discharged to the rear of the vehicle.
Further, a part flows outside the diffuser 50, passes through the gap between the opening 1 of the rear bumper 100 and the garnish 11, cools the opening 1, and adjusts the temperature of the diffuser 50 and the first diffuser side attachment portion 21. The temperature is lowered and discharged to the vehicle rear side Rr.
According to the configuration of the present invention, since the first diffuser-side attachment portion 21 is disposed in the vicinity of the opening 1 of the rear bumper 100 where the wind flow is relatively strong, cooling by wind can be expected more.

[Arrangement structure of diffuser 50 and muffler 80]
As shown in FIG. 10, the front end portion 10 </ b> A (the front end portion of the diffuser 50) of the diffuser main body portion 10 is disposed below the back panel 71 with the panel surface facing the vehicle front-rear direction, and the vehicle front side Fr than the back panel 71. Protruding. That is, the diffuser main body 10 is disposed below the back panel 71 (a notch 70 portion described later) and passes below the back panel 71 from the back side to the front side of the back panel 71 in the vehicle front-rear direction. Then, the muffler pipe 7 is inserted into the diffuser main body 10 from the vehicle front side Fr as described above, and the distance d2 between the front end 10A1 of the diffuser main body 10 and the rear surface 78 of the muffler main body 75 on the vehicle rear side Rr in the vehicle front-rear direction. Is set longer than the protrusion length e1 of the diffuser 50 from the front panel surface 71A of the back panel 71.

  As shown in FIG. 11, the back panel 71 is a panel that is long in the vehicle width direction from the left end portion to the right end portion of the vehicle body. The upper half of the left and right center portion of the back panel 71 is greatly cut away so as to correspond to the rear loading chamber 72 and open upward. A pair of left and right bumper member bases 74 are fixed to the back panel 71, and a pair of upper and lower square pipe-like bumper members 73 that are long in the vehicle width direction are connected to the bumper member base 74 via a connecting member 81. The bumper member 73 is located above the garnish 11 of the diffuser 50.

As shown in FIGS. 12 and 13, the diffuser body 10 </ b> A is disposed in a notch 70 formed by notching the lower end of the back panel 71 in the vehicle width direction. As described above, the front end portion 10A of the portion 10 protrudes from the back panel 71 toward the vehicle front side Fr.
A gap is formed between the peripheral edge 70N of the notch 70 and the front end portion 10A of the diffuser main body 10 to make it difficult to transfer the heat of the diffuser 50 to the back panel 71, and the back panel 71 when the diffuser 50 is displaced. It is possible to avoid interfering with.

  When viewed from the rear of the vehicle, the lower end edge 77 (see FIG. 10) of the left and right ends of the rear bumper 100 is overlapped with the lower end of the muffler body 75, and the lower end edge 77 of the rear bumper 100 is set to the front end of the diffuser body 10. When the rear bumper moves to the front side of the vehicle by projecting to the front side Fr of the vehicle 10A1 and receiving a load, the lower end edge 77 of the left and right end of the rear bumper 100 comes before the front end 10A1 of the diffuser main body 10. The muffler main body 75 is configured to contact the lower end portion.

  As shown in FIG. 10, the inner diameter of the diffuser 50 in the longitudinal section is set to a minimum at the connecting portion 82 of the diffuser main body 10 and the garnish 11, and viewed from the rear of the vehicle (as viewed from the vehicle rear side Rr), The rear end portion 7B of the muffler pipe 7 is located inside the inner peripheral edge 82N of the connecting portion 82 (corresponding to the inner peripheral edge of the diffuser 50). A gap d3 is formed between the rear end portion 7B of the muffler pipe 7 and the lower portion of the inner peripheral edge 82N of the connecting portion 82. Further, the rear end 7B1 of the muffler pipe 7 and the inner peripheral edge 82N of the minimum diameter portion of the connecting portion 82 are separated in the vehicle front-rear direction.

  The rear end edge of the diffuser 50 (the rear end edge 11K of the garnish 11 of the diffuser 50) is positioned in front of and below the rear end edge 100K of the rear bumper 100. When the automobile having the above structure receives a load from the rear and the rear bumper moves to the front side of the vehicle, the front bumper of the vehicle to which the load is applied collides with the rear end edge 100K of the rear bumper 100 at the upper rear side of the diffuser 50. Due to this collision, a load is input to the bumper member 73, the connecting member 81, and the back panel 71 via the rear bumper 100, and the diffuser 50 connected only to the rear bumper 100 moves to the vehicle front side Fr integrally with the rear bumper 100.

  According to the configuration of the present invention, the front end portion 10A of the diffuser main body portion 10 is disposed below the back panel 71 so as to protrude toward the vehicle front side Fr from the back panel 71, and the muffler pipe 7 is inserted into the diffuser 50. Therefore, even if the diffuser 50 moves to the vehicle front side Fr during the rear-end collision, the front end portion 10A of the diffuser main body 10 does not collide with the back panel 71 from the vehicle rear side Rr, and the damage to the diffuser 50 can be avoided. it can.

  Further, the distance d2 between the front end 10A1 of the diffuser main body 10 and the rear surface 78 of the muffler main body 75 on the vehicle rear side Rr in the vehicle front-rear direction is longer than the protrusion length e1 of the diffuser 50 from the front panel surface 71A of the back panel 71. Since the distance d2 is set long, the amount of movement of the diffuser 50 to the vehicle front side Fr at the time of rear-end collision is increased so that the front end 10A1 of the diffuser main body 10 is the vehicle of the muffler main body 75. It can be made difficult to collide with the rear surface 78 of the rear side Rr, and damage to the diffuser 50 can be avoided.

  Since the rear end portion 7B of the muffler pipe 7 is located on the inner side (inward in the radial direction) of the inner peripheral edge 82N of the connection portion 82 as viewed from the rear of the vehicle, the rear end portion of the muffler pipe 7 at the time of rear-end collision 7B can easily pass through the diffuser 50, and interference between the rear end 7B of the muffler pipe 7 and the inner peripheral edge 82N of the connecting portion 82 can be avoided, and damage to the diffuser 50 can be avoided. Can do. In addition, the heat of the exhaust gas can be made difficult to be transmitted to the diffuser 50, and the heat of the exhaust gas can be made difficult to be transmitted to the rear bumper 100 through the diffuser 50.

  Further, as described above, since the rear end edge of the diffuser 50 (the rear end edge 11K of the garnish 11 of the diffuser 50) is located in front of and below the rear end edge 100K of the rear bumper 100, the pedestrian is at a high temperature. Touching can be avoided.

DESCRIPTION OF SYMBOLS 1 Opening formed in rear bumper 7 Muffler pipe 7B Muffler pipe rear end 10A Diffuser front end (diffuser main body front end)
10A1 Diffuser front end 50 Diffuser 70 Notch 71 Back panel 71A Back panel front panel surface 75 Muffler body 77 Rear bumper lower end edge 78 Rear surface of muffler vehicle rear side 80 Muffler 82N Inner edge
100 Rear bumper d2 Distance between the front end of the diffuser and the rear surface of the muffler main body in the vehicle front-rear direction e1 Projection length of the diffuser from the front panel surface of the back panel Fr Vehicle front side Rr Vehicle rear side

Claims (6)

A muffler having a muffler body and a muffler pipe projecting from the rear surface of the muffler body on the vehicle rear side is provided.
A rear structure of a vehicle in which a diffuser for passing exhaust gas from the muffler pipe and exhausting the exhaust gas is attached to a rear bumper,
The front end portion of the diffuser is disposed below the back panel and protrudes to the vehicle front side than the back panel,
A rear structure of a vehicle in which the muffler pipe is inserted into the diffuser.   2. The vehicle according to claim 1, wherein a distance in the vehicle front-rear direction between a front end of the diffuser and a rear surface of the muffler main body on the vehicle rear side is set to be longer than a protrusion length of the diffuser from the front panel surface of the back panel. Rear structure. In rear view of the vehicle, the lower end edge of the rear bumper is overlapped with the muffler body,
The rear structure of the vehicle according to claim 1 or 2, wherein a lower end edge of the rear bumper protrudes forward of the vehicle from a front end of the diffuser.   The muffler pipe protruding from the muffler main body is formed in a straight line, and the rear end portion of the muffler pipe is located inside the inner peripheral edge of the diffuser in a rear view of the vehicle. The rear structure of the vehicle described in 1.   A front end portion of the diffuser is disposed in a notch formed by notching an end portion in a vehicle width direction of a lower end portion of the back panel, and the front end portion of the diffuser protrudes toward the vehicle front side from the back panel. The rear structure of the vehicle according to any one of claims 1 to 4. The vehicle rear structure according to any one of claims 1 to 5, wherein a rear end portion of the diffuser is inserted into an opening formed in the rear bumper.

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