JP2019081454A - Vehicle body rear part structure - Google Patents

Abstract

To provide a vehicle body rear part structure which can inhibit weight increase to inhibit heat damage at a vehicle rear part.SOLUTION: A vehicle body rear part structure includes in a vehicle body of a vehicle rear part: a power generation unit 10 which is constituted of a power generator 11 for generating electric power for driving a vehicle 1 and an internal combustion engine 12 for power generation serving as a power source of the power generator 11; and an exhaust unit 20 which is constituted of an exhaust pipe 21 connected to the internal combustion engine 12 for power generation, an upstream catalyst 22, a downstream catalyst 23, and a muffler 24. The vehicle body rear part structure also includes: an enclosing member 40 which encloses the exhaust unit 20 from six sides; and a blower fan 50 which blows outer air to an interior of the enclosing member 40. The enclosing member 40 includes: a ventilation opening S2 into which the outer air is introduced through the blower fan 50; and a bottom part opening S1 which opens at a portion corresponding to an exhaust pipe outlet 21a of the exhaust pipe 21. The ventilation opening S2 of the enclosing member 40 is disposed opposite to the bottom part opening S1 of the enclosing member 40.SELECTED DRAWING: Figure 2

Description

  The present invention relates to, for example, a vehicle rear portion structure in which a range extender is provided on the lower surface side of a floor panel at the rear of a vehicle body of a vehicle.

  Recently, in vehicles such as automobiles, in addition to vehicles powered by conventional internal combustion engines, hybrid vehicles and electric vehicles powered by drive motors driven by the power of secondary batteries are increasing. Among such vehicles, for example, in a hybrid vehicle of a series hybrid system and an electric vehicle with a range extender, a generator for supplying power to a secondary battery and an internal combustion engine for power generation for driving the generator are included. Have.

  For example, Patent Document 1 describes an electric vehicle with a range extender equipped with a traveling motor at the front of the vehicle and a range extender consisting of a generator, an internal combustion engine for power generation, and a fuel tank at the rear of the vehicle.

  By the way, in an electric vehicle with a range extender like Patent Document 1, it is difficult for the traveling wind from the front of the vehicle to be conducted to the rear of the vehicle, so the internal combustion engine for power generation and the exhaust pipe are not easily cooled by the traveling wind from the front of the vehicle Also, the heat emitted from the internal combustion engine for power generation and the exhaust pipe tends to stagnate at the rear of the vehicle. For this reason, in patent document 1, there existed a possibility that the heat damage by the heat air of a vehicle rear might arise.

  For example, the heat of the power generation internal combustion engine and the heat of the exhaust pipe may be transmitted to a converter disposed at the rear of the vehicle, a high voltage wire harness, or the like, which may cause unintended thermal damage. Alternatively, the heat of the power generation internal combustion engine and the heat of the exhaust pipe may be transmitted to the vehicle compartment through the floor panel, which may increase the temperature in the vehicle compartment.

  As means for solving such a problem, for example, it is conceivable to arrange a blower such as a blower fan at the rear of the vehicle body, but depending on the size of the blower, an internal combustion engine for power generation and an exhaust pipe are arranged. There is a problem that the weight at the rear of the vehicle is further increased by the air blowing means.

Unexamined-Japanese-Patent No. 2017-52500

  SUMMARY OF THE INVENTION In view of the above-described problems, the present invention has an object to provide a vehicle rear portion structure capable of suppressing a heat increase at the rear portion of the vehicle while suppressing an increase in weight.

  The present invention relates to a generator for generating electric power for running a vehicle, a power generation unit comprising an internal combustion engine for power generation which is a power source of the generator, an exhaust pipe connected to the internal combustion engine for power generation, a catalyst And an exhaust unit configured with a silencer, in a vehicle rear portion structure provided in a vehicle rear portion of the vehicle, the enclosure member surrounding six sides of the exhaust unit, and a blower fan for blowing the outside air inside the enclosure member And the enclosure member is provided with an introduction opening which is an opening through which the outside air is introduced through the blower fan, and an exhaust opening having a portion corresponding to the outlet of the exhaust pipe; An introduction opening is disposed opposite to the exhaust opening of the enclosing member.

According to the present invention, it is possible to suppress the increase in weight and to suppress the heat damage at the rear of the vehicle.
Specifically, the vehicle rear portion structure can cool the exhaust unit by blowing the outside air to the exhaust unit surrounded by the enclosing member via the blower fan.

  Furthermore, since the introduction opening and the exhaust opening are disposed opposite to each other, the vehicle body rear structure can efficiently flow the outside air introduced from the introduction opening to the exhaust opening. At this time, the vehicle body rear structure can combine the flow of air flowing from the exhaust opening of the enclosing member to the outside with the flow of exhaust gas discharged from the outlet of the exhaust pipe.

  Thus, the vehicle rear structure can efficiently flow the outside air introduced from the introduction opening of the enclosing member from the exhaust opening to the outside. For this reason, the vehicle body rear structure can efficiently flow the hot air staying inside the enclosure member to the outside.

  In addition, since the temperature rise of the enclosure member due to the heat of the exhaust unit can be suppressed, the vehicle rear structure can suppress the amount of heat released by the enclosure member. For this reason, the vehicle body rear structure can suppress the temperature rise of the vehicle rear as compared with the case where the enclosure member and the blower fan are not provided.

Furthermore, the vehicle rear structure can miniaturize the enclosing member as compared with the case where the power generation unit and the exhaust unit are integrally enclosed. For this reason, it is not necessary to excessively increase the static pressure and air volume of the blower fan, and it is possible to suppress the increase in weight due to the enlargement of the enclosing member and the blower fan.
Therefore, the vehicle rear structure is configured to discharge the heat of the exhaust unit to the outside, thereby suppressing the increase in weight and suppressing the heat damage at the rear of the vehicle.

  As an aspect of the present invention, the rear portion of the vehicle body of the vehicle includes a sub-frame having a cross member extending in the vehicle width direction, and the sub-frame supports the exhaust unit and the enclosing member behind the cross member in the vehicle. Configuration.

  According to the present invention, the vehicle rear structure facilitates the support of the exhaust unit and the enclosing member, and can reduce the number of supporting members that support the enclosing member. Therefore, the rear body structure can suppress the heat damage at the rear of the vehicle by reliably suppressing the weight increase.

  As an aspect of the present invention, the sub-frame includes a pair of left and right side members extending in the longitudinal direction of the vehicle, the cross member connecting the rear ends of the side members in the vehicle width direction, and the vehicle from the rear end of the side members The exhaust unit includes a pair of crush cans extending rearward, and the exhaust unit is disposed between the crush cans.

According to the present invention, the vehicle rear structure can achieve both suppression of heat damage at the rear of the vehicle with reduced weight increase and improvement of safety against a collision from the rear of the vehicle.
Specifically, by arranging the exhaust unit between the crash cans, the rear structure of the vehicle body is longer in the longitudinal direction of the vehicle than in the case where the power generation unit and the exhaust unit are arranged between the side members. Can be shortened.

  Furthermore, when a collision load from the rear of the vehicle is applied, the exhaust unit and the enclosing member are more easily deformed than the power generation unit. Therefore, when a collision load from the rear of the vehicle is applied to the rear of the vehicle body, the vehicle body rear structure can integrally deform the exhaust unit and the enclosing member together with the crushing of the crush can.

Thus, the vehicle rear structure can absorb the collision load from the rear of the vehicle by the crush can, the exhaust unit, and the enclosing member.
Therefore, by arranging the exhaust unit between the crash cans in the sub-frame, the rear body structure achieves both suppression of heat damage at the rear of the vehicle with reduced weight increase and improvement in safety against a collision from the rear of the vehicle. can do.

Further, as an aspect of the present invention, the enclosure member includes an air guide portion which guides the wind of the blower fan toward the power generation unit.
According to the present invention, the rear structure of the vehicle body can blow the wind of the blower fan to both the power generation unit and the exhaust unit.

  Furthermore, the vehicle body rear structure can blow the wind from the cooling fan to the heat generating device such as a converter disposed adjacent to the power generation unit, for example. Therefore, the vehicle rear structure can generate the flow of air in the entire rear of the vehicle.

  Therefore, by providing the enclosure member with a wind guiding portion for guiding the wind toward the power generation unit, the vehicle rear structure can more reliably suppress the temperature rise at the rear of the vehicle, so that the heat damage at the rear of the vehicle is made more reliable. Can be suppressed.

Further, as an aspect of the present invention, the catalyst and the silencer are juxtaposed in the vehicle vertical direction.
According to the present invention, the rear structure of the vehicle body can suppress a weight increase to further suppress the heat damage at the rear of the vehicle, and can further improve the safety against a collision from the rear of the vehicle.

  Specifically, by arranging the catalyst and the silencer in parallel in the vertical direction of the vehicle, the vehicle rear structure has an exhaust unit in the longitudinal direction of the vehicle as compared to the case where the catalyst and the silencer are arranged in parallel in the longitudinal direction of the vehicle The length of the enclosing member can be shortened.

  For this reason, the vehicle body rear structure can suppress the wind of the blower fan introduced into the inside of the enclosure member through the introduction opening from diffusing in the vehicle longitudinal direction. Thus, the rear structure of the vehicle body can more efficiently flow the hot air inside the enclosing member to the outside without increasing the size of the blower fan.

  In addition, when a collision load from the rear of the vehicle is applied, the vehicle rear structure can deform the exhaust unit such that the catalyst and the silencer are separated in the vertical direction of the vehicle. As a result, when the collision load from the rear of the vehicle is applied, the rear part structure of the vehicle can reduce the amount of movement of the exhaust unit toward the front of the vehicle, so the intrusion of the exhaust unit and the power generation unit into the vehicle compartment can be made more reliably. It can be prevented.

  Therefore, the rear structure of the vehicle body can suppress the increase in weight and further suppress the heat damage at the rear of the vehicle and further improve the safety against the collision from the rear of the vehicle by arranging the catalyst and the silencer in the vertical direction of the vehicle. be able to.

  According to the present invention, it is possible to provide a vehicle rear portion structure capable of suppressing heat damage at the rear portion of the vehicle while suppressing an increase in weight.

The block diagram which shows the structure of a vehicle. FIG. 6 is a bottom view showing the appearance of the rear of the vehicle body as viewed from below the vehicle. The top view which shows the external appearance of the rear sub-frame seen from the vehicle upper direction. The appearance perspective view showing the appearance of the enclosure member seen from the vehicles back lower part. 2. AA arrow sectional drawing which shows the cross section of the enclosure member in the AA arrow in FIG. BB arrow sectional drawing which shows the cross section of the enclosure member in the BB arrow in FIG. Explanatory drawing explaining the flow of the air inside an exhaust unit by BB arrow.

An embodiment of the invention will now be described in conjunction with the drawings.
1 shows the configuration of the vehicle 1, FIG. 2 shows a bottom view of the rear of the vehicle seen from below the vehicle, FIG. 3 shows a plan view of the sub frame 36 seen from above the vehicle, and FIG. FIG. 5 is an external perspective view of the enclosing member 40 viewed from the rear lower side, FIG. 5 is a cross-sectional view of the enclosing member 40 taken along line A-A in FIG. The BB arrow sectional drawing of the enclosure member 40 in an arrow is shown.

Further, in FIG. 3, the enclosure member 40 and the blower fan 50 are not shown in order to clarify the illustration.
Further, in the drawings, arrows Fr and Rr indicate the front-rear direction, arrow Fr indicates the front, and arrow Rr indicates the rear. Furthermore, arrows Rh and Lh indicate the width direction, arrow Rh indicates the right direction, and arrow Lh indicates the left direction, with the vehicle interior side in the vehicle width direction being the inside of the vehicle width direction, and the vehicle outside in the vehicle width direction On the outside in the vehicle width direction.

  The vehicle 1 of the present embodiment includes a traveling motor for transmitting driving force to an axle at the front of the vehicle, an onboard battery for supplying power to the traveling motor at a lower portion of a compartment, and charges the onboard battery. It is a so-called electric vehicle with a range extender equipped with a generator and a power generation internal combustion engine at the rear of the vehicle.

  More specifically, as shown in FIG. 1, the vehicle 1 has a pair of left and right front wheels 2 disposed at the front of the vehicle, a pair of left and right rear wheels 3 disposed at the rear of the vehicle, and an axle 4 on the left and right front wheels 2. A reduction gear 5 connected to each other, a traveling motor 6 connected to the reduction gear 5, and an on-vehicle battery 7 electrically connected to the traveling motor 6 via the high voltage wire harness E1; A range extender device 8 for supplying power to the battery 7 is provided.

As shown in FIG. 1, the range extender device 8 in the vehicle 1 is configured of a power generation unit 10 and an exhaust unit 20 disposed at the rear of the vehicle.
As shown in FIG. 1, the power generation unit 10 includes a generator 11 electrically connected to an on-vehicle battery 7 via a high voltage wire harness E2, and a power generation internal combustion engine 12 for driving the generator 11. And a fuel tank 13 for storing the fuel supplied to the power generation internal combustion engine 12. The power generation internal combustion engine 12 is, for example, a rotary engine.

  On the other hand, as shown in FIG. 1, the exhaust unit 20 includes an exhaust pipe 21 through which exhaust gas discharged from the internal combustion engine 12 for power generation flows, an upstream catalyst 22 for removing harmful substances in the exhaust gas, and a downstream catalyst 23 And the silencer 24 which suppresses the sound when exhaust gas is discharge | released outside is comprised.

The vehicle rear portion structure in the vehicle 1 having such a configuration will be described in more detail.
As shown in FIG. 2, the vehicle body rear structure of the vehicle 1 is, as shown in FIG. 2, a pair of left and right side sills 31 extending in the vehicle longitudinal direction at a predetermined distance in the vehicle width direction; Floor frame 32, a rear side frame 33 extending rearward from the rear end of the floor frame 32, an upper crash can 34 extending rearward from the rear end of the rear side frame 33, and a rear width between the upper crash can 34 It comprises an upper bumper reinforcement 35 connected in a direction, a floor frame 32, and a sub-frame 36 disposed below the rear side frame 33 on the vehicle.

The floor frame 32 is formed so as to extend outward in the vehicle width direction from the rear end of a front side frame (not shown) constituting the front portion of the vehicle body in a bottom view.
At the rear end of the floor frame 32, as shown in FIG. 2, a torsion beam 9 for supporting the pair of left and right rear wheels 3 is swingably supported. More specifically, the torsion beam 9 is swingably supported at the rear end of the floor frame 32 at the front end of an arm portion extending in the vehicle longitudinal direction.

Further, as shown in FIG. 2, the rear side frame 33 is extended from the rear end of the floor frame 32 toward the rear of the vehicle.
Further, as shown in FIG. 2, the upper crash can 34 is fastened and fixed to an upper connecting portion provided at the rear end of the rear side frame 33.
Further, as shown in FIG. 2, the upper bumper reinforcement 35 is formed in a curved shape so that the approximate center in the vehicle width direction slightly protrudes to the rear of the vehicle in a bottom view.

Further, the sub-frame 36 is configured by connecting the battery case frame 37 disposed below the floor frame 32 and the rear sub-frame 38 disposed below the rear side frame 33 in this order from the front of the vehicle. doing.
As shown in FIG. 2, the battery case frame 37 is formed to cover the lower surface of the floor panel (not shown) in a bottom view.

  More specifically, as shown in FIG. 2, the battery case frame 37 connects the front end of the front and rear direction frame 371 with the left and right front and rear direction frames 371 extending in the vehicle front and rear direction along the floor frame 32 in bottom view. Surrounded by one width direction frame (not shown), a second width direction frame 372 connecting the rear ends of the front and rear direction frames 371, the left and right front and rear direction frames 371, the first width direction frame, and the second width direction frame 372 And a panel member 373 covering the broken portion.

  In the battery case frame 37, a plurality of front and rear direction frames 371 are fastened and fixed to the lower surface of the floor frame 32, and a plurality of first width direction frames and second width direction frames 372 connect the left and right floor frames 32 in the vehicle width direction. It is fastened and fixed to the cross member (not shown).

  Then, on the upper surface of the panel member 373 in the battery case frame 37, as shown in FIG. 3, the in-vehicle battery 7 positioned between the floor panel and the left side of the vehicle are disposed adjacent to the left side of the vehicle. The fuel tank 13 is mounted and fixed.

  Although the vehicle battery 7 is not illustrated in detail, a plurality of battery cells configured by lithium ion secondary batteries, a control device that controls charging and discharging of the battery cells, and a high voltage wire harness are connected. Integrated in a junction box.

  Further, as shown in FIGS. 2 and 3, the rear sub-frame 38 connects a pair of left and right side members 381 extending in the vehicle longitudinal direction inside the rear side frame 33 in the vehicle width direction and the rear ends of the side members 381. Cross member 382, a pair of left and right lower crash cans 383 extending from the rear end of the side member 381 to the rear of the vehicle, lower bumper reinforcement 384 connecting the rear ends of the lower crash can 383 and the rear side frame 33 The front connecting portion 385 and the rear connecting portion 386 are configured.

  As shown in FIG. 3, the side members 381 are fastened and fixed to the second width direction frame 372 of the battery case frame 37 so as to extend from the rear end of the longitudinal direction frame 371 in the battery case frame 37 rearward It is done. In other words, the rear side frame 33 is a cross member connecting the front end of the side member 381 in the vehicle width direction with the second width direction frame 372 of the battery case frame 37.

As shown in FIG. 2, the side member 381 is formed at a position forward of the rear end of the rear side frame 33 in the vehicle front direction in a front-rear direction length at which the rear end is located.
As shown in FIG. 2, the cross member 382 is formed in a shape having a length in the vehicle width direction substantially equal to the distance between the left and right rear side frames 33 in a bottom view.

  More specifically, as shown in FIG. 5, in the longitudinal cross section along the vehicle longitudinal direction, the cross member 382 includes an inner panel 382a having a substantially hat-shaped cross section and an outer panel 382b having a substantially flat-shaped cross section. It is formed in the closed cross-sectional shape of the cross-sectional substantially rectangular shape joined in this order from the vehicle front.

As shown in FIG. 5, an upper bracket 387 and a lower bracket 388, to which an enclosure member 40 described later is fastened, are joined to the rear surface of the outer panel 382b, as shown in FIG.
The upper bracket 387, as shown in FIG. 5, is a bracket formed by bending a plate having a predetermined thickness, and is joined to the upper portion of the rear surface of the outer panel 382b.

  More specifically, as shown in FIGS. 3 and 5, upper bracket 387 has an upper joint portion 387a having a thickness in the vehicle longitudinal direction and joined to the rear surface of outer panel 382b, and a vehicle from the upper end of upper joint portion 387a. It is integrally formed with an upper extension portion 387b extending rearward and to which an enclosing member 40 described later is fastened.

The upper bracket 387 has a length in the vehicle width direction slightly shorter than the distance between the exhaust pipe 21 through the upper side of the cross member 382 and the lower crash can 383 on the right side of the vehicle, as shown in FIG. It is formed in the shape which has.
On the other hand, as shown in FIG. 5, the lower bracket 388 is a bracket formed by bending a plate having a predetermined thickness, and is joined to the lower portion of the rear surface of the outer panel 382b.

  More specifically, as shown in FIG. 5, the lower bracket 388 has a thickness in the longitudinal direction of the vehicle and a lower joint portion 388a joined to the rear surface of the outer panel 382b, and a lower end of the lower joint portion 388a It is integrally formed with a lower extending portion 388b extending toward the end and to which an enclosing member 40 described later is fastened. Lower bracket 388 is formed in a shape having a length in the vehicle width direction shorter than the distance between left and right side members 381 in the vehicle width direction.

The lower crash can 383 has a length in the vehicle longitudinal direction longer than the longitudinal direction of the vehicle in the upper crash can 34 as shown in FIG. 3 and is fastened to the lower connecting portion provided at the rear end of the side member 381 It is fixed. As shown in FIG. 6, in the lower crash can 383, the cross sectional shape in the longitudinal cross section along the vehicle width direction is formed in a closed cross sectional shape having a substantially cross shape in cross section.
As shown in FIG. 3, the lower bumper reinforcement 384 is formed in a curved shape so that the approximate center in the vehicle width direction slightly protrudes toward the rear of the vehicle in a bottom view.

  The lower bumper reinforcement 384 is, as shown in FIG. 5, in a longitudinal cross section along the longitudinal direction of the vehicle, an inner panel 384a having a substantially hat-shaped cross section opened at the rear of the vehicle and an outer panel 384b having a substantially flat cross-section. It is formed in the closed cross-sectional shape of the cross-sectional substantially rectangular shape joined in this order from the vehicle front. The outer panel 384b of the lower bumper reinforcement 384 is formed in a shape in which the lower end is extended toward the front of the vehicle, as shown in FIG.

  As shown in FIG. 2, the front connection portion 385 has a generally trapezoidal shape in plan view with the short side on the vehicle front side, and the front surface of the cross member 382 on the outer side in the vehicle width direction It is formed in the shape of connecting the lower surface of the rear side frame 33.

As shown in FIG. 2, the rear connection portion 386 is formed in such a shape as to connect the approximate center of the lower crash can 383 in the vehicle longitudinal direction and the vicinity of the rear end of the rear side frame 33.
In the rear sub-frame 38 having such a configuration, as shown in FIG. 2 and FIG. 3, the generator 11 of the power generation unit 10 described above between the left and right side members 381 and the lower crash The internal combustion engine 12 and the exhaust unit 20 are disposed in this order from the front of the vehicle.

  Specifically, as shown in FIG. 3, the generator 11 of the power generation unit 10 and the internal combustion engine 12 for power generation are in a space enclosed by the battery case frame 37, the left and right side members 381, and the cross member 382 It is disposed in an integrally connected state.

The generator 11 is disposed such that the axial center of its rotation axis substantially coincides with the longitudinal direction of the vehicle.
On the other hand, the internal combustion engine 12 for power generation is connected to the vehicle rear side of the generator 11 so that the axis center of the output shaft thereof is positioned substantially coaxially with the rotation axis of the generator 11.

  Then, as shown in FIG. 3, the generator 11 and the power generation internal combustion engine 12 connect the front ends of the left and right rear side frames 33 in the vehicle width direction via the front mounting bracket 14 provided at the front end of the generator 11 Is supported by a cross member (not shown). Furthermore, the generator 11 and the internal combustion engine 12 for power generation are connected to the cross member (not shown) that connects the left and right rear side frames 33 in the vehicle width direction behind the cross member to which the front mounting bracket 14 is connected. It is supported via a rear side mounting bracket 15 provided at the rear end of the power generation internal combustion engine 12.

  As shown in FIG. 3, the exhaust unit 20 has an upstream catalyst 22, a downstream catalyst 23, and a silencer 24 in a space surrounded by the cross member 382, the lower crash cans 383 on the left and right, and the lower impact reinforcement 384. It arrange | positions so that it may be located, and the vehicle width direction both ends of the silencer 24 are supported in the vehicle width direction inner side of the rear side connection part 386 through the suspension rubber 25. As shown in FIG.

More specifically, the upstream catalyst 22 and the downstream catalyst 23 are arranged in this order from the left side of the vehicle along the vehicle width direction between the left and right lower crash cans 383 as shown in FIG. 3, FIG. 5 and FIG. It is juxtaposed. The outer diameter of the downstream catalyst 23 is assumed to be larger than that of the upstream catalyst 22.
On the other hand, the silencer 24 is disposed on the vehicle lower side of the upstream catalyst 22 and the downstream catalyst 23 between the lower crash cans 383 on the left and right so as to polymerize in plan view.

The upstream catalyst 22, the downstream catalyst 23, and the silencer 24 thus arranged are connected to the left side of the vehicle for power generation internal combustion engine 12 at one end and connected via an exhaust pipe 21 whose other end is open. .
Among them, an exhaust pipe 21 connecting the power generation internal combustion engine 12 and the upstream catalyst 22 is formed in a shape extending from the power generation internal combustion engine 12 through the upper side of the cross member 382 to the rear of the vehicle.
Furthermore, an exhaust pipe 21 connecting the downstream catalyst 23 and the silencer 24 is formed to extend from the downstream catalyst 23 to the right side of the vehicle and then U-turned to the lower side of the vehicle and to the left side of the vehicle.

  In addition, the exhaust pipe 21 whose one end is connected to the silencer 24 extends slightly from the silencer 24 to the left side of the vehicle, and then the vehicle rear lower part, more specifically, the vehicle than the lower bumper reinforcement 384 It is formed in the shape extended toward the downward direction. An exhaust pipe outlet 21a, which is the other end of the exhaust pipe 21, is formed in an oblong shape having a diameter enlarged toward the right side of the vehicle, as shown in FIGS.

  As shown in FIG. 2 and FIG. 4 to FIG. 6, the rear body structure of the vehicle 1 having such a configuration includes the lower catalyst can 383, the cross member 382, and the lower bumper reinforcement 384, and the upstream catalyst 22, The downstream catalyst 23 and an enclosure member 40 integrally surrounding six sides of the silencer 24 and a blower fan 50 for blowing air to the inside of the enclosure member 40 are provided.

The enclosure member 40 has a three-dimensional shape formed by three-dimensionally bending a thin plate made of stainless steel, and is a substantially box-like upper enclosure member 41 opened at the lower side of the vehicle and a substantially box-shaped lower side opened at the upper side of the vehicle And an enclosing member 42.
As shown in FIGS. 5 and 6, the upper enclosing member 41 is formed to cover the exhaust unit 20 exposed above the vehicle than the lower crash can 383 from above the vehicle.

  Specifically, as shown in FIGS. 5 and 6, the upper enclosing member 41 is fastened to the upper front end 411 fastened to and fixed to the upper bracket 387 of the cross member 382, and to the outer panel 384b of the lower bumper reinforcement 384. An upper rear end 412 to be fixed, a top plate 413 covering between the upper front end 411 and the upper rear end 412, an upper left wall 414 covering an opening in the vehicle width direction, and an upper right wall 415 And are integrally formed.

  As shown in FIG. 5, the upper front end portion 411 is formed in a flat plate having a substantially rectangular shape in plan view, having a thickness in the vehicle vertical direction and a length substantially the same as the length in the vehicle width direction of the upper bracket 387. It is done. The upper front end portion 411 is in contact with the upper extension portion 387 b of the upper bracket 387 from above the vehicle, and is fastened and fixed.

  As shown in FIGS. 4 and 5, the upper rear end portion 412 is substantially rectangular in a rear view and has a thickness in the longitudinal direction of the vehicle, and is formed in a curved shape along the outer panel 384b of the lower bumper reinforcement 384. . The upper rear end portion 412 is abutted against the rear surface of the outer panel 384b from the rear of the vehicle to be fastened and fixed.

  As shown in FIG. 5, the top plate portion 413 has an upper front surface portion 413a extending upward from the rear end of the upper front end 411 and an upper end of the upper front surface portion 413a in a longitudinal cross section along the vehicle longitudinal direction. Extending from the rear end of the first upper surface portion 413b to the rear of the vehicle, the upper rear surface portion 413c extending downward from the rear end of the first upper surface portion 413b, and the rear end of the upper rear surface portion 413c And a second upper surface portion 413 d connected to the upper rear end portion 412.

  As shown in FIGS. 5 and 6, the upper front surface portion 413a connects the internal combustion engine 12 for power generation and the upstream catalyst 22 with a length in the vehicle vertical direction whose upper end is located above the vehicle than the upper end of the downstream catalyst 23. It is formed in a substantially flat plate shape having a length in the vehicle width direction from the vicinity of the exhaust pipe 21 to the upper right side wall portion 415 described later.

  As shown in FIGS. 5 and 6, the first upper surface portion 413b has a length in the vehicle longitudinal direction in which the rear end is located at a position rearward of the rear end of the downstream catalyst 23 and a lower crash can 383 in the vehicle width direction. And the length in the vehicle width direction slightly shorter than the distance between The first upper surface portion 413b extends rearward of the vehicle and slightly upward of the vehicle from the upper end of the upper front surface portion 413a.

  As shown in FIGS. 4 and 5, the upper rear surface portion 413c has substantially the same length in the vehicle vertical direction as the length in the vertical direction of the vehicle in the upper front portion 413a and substantially the same as the length in the vehicle width direction of the first upper surface portion 413b. It is formed in a substantially flat plate shape having a length in the vehicle width direction.

  As shown in FIGS. 4 and 5, the second upper surface portion 413d has a length in the vehicle longitudinal direction from the lower end of the upper rear surface portion 413c to the upper end of the upper rear end 412 and a length in the vehicle width direction of the upper rear surface portion 413c. It is formed in a substantially flat plate shape having substantially the same length in the vehicle width direction as the length.

  As shown in FIG. 6, the upper left side wall portion 414 is formed in a substantially flat shape extending toward the lower side of the vehicle from the edge of the top plate portion 413 on the left side of the vehicle. As shown in FIG. 6, the upper left side wall portion 414 is extended to have a length in the vertical direction of the vehicle overlapping with the side surface inside the vehicle in the lower crash can 383 on the left side of the vehicle.

  Furthermore, as shown in FIG. 6, the upper left side wall portion 414 is integrally formed with a bent portion 414a that covers a gap with the exhaust pipe 21 adjacent to the upper front surface portion 413a in a rear view. The bent portion 414a is formed by extending the front edge of the upper left side wall portion 414 forward in the vehicle and bending inward in the vehicle width direction.

  In addition, as shown in FIG. 6, the upper left side wall portion 414 is a portion where the rear connection portion 386 is loosely fitted by bending a portion overlapping with the rear connection portion 386 on the left side of the vehicle toward the upper side of the vehicle. It forms a notch. The upper left side wall portion 414 is fastened and fixed to the upper surface of the rear connection portion 386 via the bent portion.

  As shown in FIGS. 4 and 6, the upper right side wall portion 415 is formed in a substantially flat shape extending outward from the edge on the right side of the vehicle in the top plate portion 413 in the vehicle width direction and downward to the vehicle. . As shown in FIG. 6, the upper right side wall portion 415 is extended so as to overlap with the side surface on the vehicle outer side of the lower crash can 383 on the right side of the vehicle at the vehicle width direction outer side.

  Furthermore, as shown in FIGS. 4 and 6, the upper right side wall 415 bends a portion overlapping with the rear side connection portion 386 on the right side of the vehicle toward the upper side of the vehicle, so that the rear side connection portion 386 is loosely fitted. Form a notch. The upper right side wall portion 415 is fastened and fixed to the upper surface of the rear connection portion 386 through the bent portion.

On the other hand, as shown in FIGS. 5 and 6, the lower enclosing member 42 is formed to cover the exhaust unit 20 exposed below the lower crash can 383 from below the vehicle.
Specifically, as shown in FIGS. 5 and 6, the lower enclosing member 42 has a lower front end 421 fastened and fixed to the lower bracket 388 of the cross member 382, and an outer panel 384b of the lower bumper reinforcement 384. And a bottom plate 423 covering between the lower rear end 422 and the lower front end 421 and the lower rear end 422, a lower left wall 424 covering an opening in the vehicle width direction, and It is integrally formed with the lower right side wall 425.

  The lower front end portion 421 is formed in a shape along the lower extending portion 388b of the lower bracket 388, as shown in FIG. More specifically, as shown in FIG. 5, the lower front end portion 421 is formed in a shape inclined in such a manner that the lower end is positioned below the vehicle in the longitudinal cross section along the vehicle longitudinal direction. . The lower front end portion 421 is in contact with the lower extension portion 388 b of the lower bracket 388 from below the vehicle, and is fastened and fixed.

  As shown in FIGS. 2, 4 and 5, the lower rear end 422 has a thickness in the vertical direction of the vehicle and is shorter in the vehicle width direction than the distance between the left and right lower crash cans 383 in the vehicle width direction. It is formed in a substantially flat plate shape having a length. The lower rear end portion 422 is in contact with the lower surface of the outer panel 384b of the lower bumper reinforcement 384 from below the vehicle, and is fastened and fixed.

  The bottom plate portion 423 is, as shown in FIG. 5, a lower front surface portion 423a extended downward from the rear end of the lower front end portion 421 and a lower front surface portion 423a in a longitudinal cross section along the vehicle longitudinal direction. And a lower rear surface portion 423c connected to the lower rear end 422 while extending from the rear end of the vehicle to the rear of the vehicle and from the rear end of the bottom portion 423b. ing.

  As shown in FIGS. 5 and 6, the lower front surface portion 423a will be described later from the vehicle vertical length at which the lower end is located below the lower end of the silencer 24 and the edge on the left side of the lower bracket 388 It is formed in a substantially flat plate shape having a length in the vehicle width direction reaching the lower right side wall portion 425.

  As shown in FIGS. 5 and 6, the bottom portion 423b has a length in the vehicle longitudinal direction from the lower end of the lower front portion 423a to the front end of the lower bumper reinforcement 384 and a distance between the lower crash can 383 in the vehicle width direction. And a substantially flat plate shape having a length in the vehicle width direction substantially equal to The bottom surface portion 423b extends rearward of the vehicle and slightly upward of the vehicle from the lower end of the lower front surface portion 423a.

  Further, as shown in FIGS. 2 and 4, the bottom portion 423b is formed with a bottom opening S1 through which the exhaust pipe outlet 21a of the exhaust pipe 21 is inserted. As shown in FIG. 2, the bottom opening S1 has a rear end of the bottom portion 423b overlapping with the exhaust pipe outlet 21a as a long side in a bottom view, and a length in the vehicle longitudinal direction reaching the front end of the bottom portion 423b It has an opening in a substantially trapezoidal shape in a bottom view.

  As shown in FIGS. 4 and 5, the lower rear surface portion 423c has a vehicle vertical length from the rear end of the bottom portion 423b to the lower end of the lower bumper reinforcement 384 and a length in the vehicle width direction of the bottom portion 423b. It is formed in a substantially flat plate shape having substantially the same length in the vehicle width direction. In the lower rear surface portion 423c, as shown in FIG. 4, an opening that is continuous from the bottom opening S1 of the bottom surface portion 423b is formed. The bottom opening S1 is an opening including the opening of the lower rear surface portion 423c.

  As shown in FIG. 6, the lower left side wall portion 424 is formed in a substantially flat shape extending upward from the edge of the bottom plate portion 423 on the left side of the vehicle toward the upper side of the vehicle. As shown in FIG. 6, the lower left side wall portion 424 is extended so as to overlap with the side surface of the lower crash can 383 on the left side of the vehicle and the outer side in the vehicle width direction.

  Further, as shown in FIG. 6, the lower left side wall portion 424 is integrally formed with a bent portion 424a which covers a gap with the lower front surface portion 423a in a rear view. The bent portion 424a is formed by extending the front edge of the lower left side wall portion 424 forward in the vehicle and bending inward in the vehicle width direction.

  In addition, as shown in FIG. 6, the lower left side wall 424 bends a portion overlapping with the rear side connecting portion 386 on the left side of the vehicle toward the outer side of the vehicle, so that the rear side connecting portion 386 loosely fits It forms a notch. The lower left side wall portion 424 is fastened and fixed to the lower surface of the rear connection portion 386 through the bent portion.

  As shown in FIGS. 4 and 6, the lower right side wall portion 425 is formed in a substantially flat shape extending outward from the edge on the right side of the vehicle in the bottom plate portion 423 in the vehicle width direction and above the vehicle. . As shown in FIG. 6, the lower right side wall 425 is extended so that the upper end approaches the lower end of the upper right side wall 415 of the upper enclosing member 41.

Furthermore, as shown in FIGS. 4 and 6, the lower right side wall 425 is formed with a blower opening S2 facing the bottom opening S1 in a direction intersecting the vehicle width direction in a rear view.
The air blowing opening S2 is formed in a substantially arc shape having a radius substantially the same as the radius of rotation of the air blowing fan 50 described later, and cut away so that the upper end of the lower right side wall 425 is opened. The blower opening S2 functions as an introduction port for introducing the wind of the blower fan 50 into the inside of the enclosing member 40.

  As shown in FIGS. 2 and 6, the blower fan 50 is mounted on the lower right side wall 425 of the lower enclosing member 42 so that the opening center at the blower opening S2 and the axial center of the rotation shaft substantially coincide with each other. It is fixed.

  For this reason, as shown in FIG. 6, the upper part of the blower fan 50 is exposed above the vehicle than the upper end of the lower right side wall 425 of the lower enclosing member 42 in a rear view. In the state where the blower fan 50 is mounted on and fixed to the lower enclosing member 42, the air taken from the right side of the vehicle is configured to blow air toward the left side of the vehicle.

Subsequently, in the above-described configuration, the flow of the wind when the blower fan 50 is rotationally driven will be described in detail with reference to FIG.
FIG. 7 is an explanatory view for explaining the flow of air inside the exhaust unit 20. As shown in FIG.

When the blower fan 50 is rotationally driven to start the blower, the wind of the blower fan 50 is ventilated above and below the vehicle across the upper right side wall portion 415 of the upper enclosing member 41, as shown in FIG. Ru.
Among them, the wind flow W1 blown to the upper side of the vehicle than the upper right side wall portion 415 of the upper side enclosing member 41 is directed to the upper left side of the vehicle along the upper surface of the upper right side wall portion 415 as shown in FIG. It becomes a flowing flow.

  Under the present circumstances, since the 1st upper surface part 413b of the upper side enclosure member 41 inclines so that a lower end may be located below vehicles with respect to a front end, the flow W1 of wind is the 1st upper surface part from the upper right side wall 415 The current flows toward the front of the vehicle along 413b. That is, the upper right side wall portion 415 of the upper enclosing member 41 and the first upper surface portion 413 b function as a wind guiding means for guiding the wind of the blowing fan 50 to the power generation unit 10.

  As a result, air at a temperature lower than the heat generated by the heat generation of the power generation unit 10 is sent to the space in front of the cross member 382 of the rear sub-frame 38 in the vehicle front. Therefore, the hot air in the space where the power generation unit 10 is disposed starts to flow, and relatively low temperature air is supplied to the power generation unit 10.

  On the other hand, the wind blown to the lower side of the vehicle than the upper right side wall portion 415 flows into the inside of the enclosing member 40 via the blowing opening S2, as shown in FIG. Then, the wind that has flowed into the inside of the enclosing member 40 is deflected, for example, due to a collision with the lower crash can 383 or the silencer 24 on the right side of the vehicle, and the wind flow W2 passing between the silencer 24 and the lower crash can 383 And the air flow W3 passing between the silencer 24 and the lower enclosing member 42.

  The wind flow W2 passing between the silencer 24 and the lower crash can 383 and the wind flow W3 passing between the silencer 24 and the lower enclosing member 42 are, as shown in FIG. After flowing toward the left side, the vehicle left side of the enclosing member 40 has a flow that is deflected toward the bottom opening S1.

  Thereafter, the wind flow W2 and the wind flow W3 flow out of the bottom opening S1, and then, together with the exhaust gas discharged from the exhaust pipe outlet 21a of the exhaust pipe 21, the air flowing in the outside of the enclosing member 40 Join the flow.

As described above, the rear body structure of the vehicle 1 that blows air to the exhaust unit 20 can suppress an increase in weight and suppress heat damage at the rear of the vehicle.
Specifically, by blowing the outside air to the exhaust unit 20 surrounded by the enclosing member 40 via the blower fan 50, the vehicle rear portion structure can cool the exhaust unit 20.

  Further, since the air blowing opening S2 and the bottom opening S1 are disposed opposite to each other, the vehicle body rear structure can efficiently flow the outside air introduced from the air blowing opening S2 to the bottom opening S1. At this time, the vehicle body rear structure can join the flow of air flowing from the bottom opening S1 of the enclosing member 40 to the outside with the flow of exhaust gas discharged from the exhaust pipe outlet 21a of the exhaust pipe 21.

  Thereby, the vehicle body rear structure can efficiently flow the outside air introduced from the blowing opening S2 of the enclosing member 40 from the bottom opening S1 to the outside. For this reason, the vehicle rear structure can efficiently cause the hot air remaining inside the enclosing member 40 to flow to the outside.

  In addition, since the temperature rise of the enclosure member 40 due to the heat of the exhaust unit 20 can be suppressed, the vehicle rear structure can suppress the amount of heat released by the enclosure member 40. For this reason, the vehicle rear structure can suppress the temperature rise of the vehicle rear as compared with the case where the enclosing member 40 and the blower fan 50 are not provided.

Furthermore, the vehicle rear structure can miniaturize the enclosing member 40 as compared to the case where the power generation unit 10 and the exhaust unit 20 are integrally enclosed. For this reason, it is not necessary to excessively increase the static pressure and the air volume of the blower fan 50, and the vehicle body rear structure can suppress an increase in weight due to the enlargement of the enclosing member 40 and the blower fan 50.
Therefore, the vehicle rear structure is configured to discharge the heat of the exhaust unit 20 to the outside, thereby suppressing the increase in weight and suppressing the heat damage at the rear of the vehicle.

  Further, the rear sub-frame 38 supports the exhaust unit 20 and the enclosing member 40 behind the cross member 382 at the vehicle rear, so that the vehicle rear structure facilitates the support of the exhaust unit 20 and the enclosing member 40, The number of support members for supporting the enclosing member 40 can be reduced. Therefore, the rear body structure can suppress the heat damage at the rear of the vehicle by reliably suppressing the weight increase.

  Rear sub frame 38 extends from the rear end of side member 381 to the rear of the vehicle from a pair of left and right side members 381 extending in the longitudinal direction of the vehicle, a cross member 382 connecting the rear ends of the side members 381 in the vehicle width direction. By providing the left and right lower crash cans 383 and the exhaust unit 20 is disposed between the lower crash cans 383, the vehicle rear structure suppresses heat damage at the rear of the vehicle which suppresses weight increase, and from the rear of the vehicle And the improvement of the safety against collisions.

  Specifically, by arranging the exhaust unit 20 between the lower crash cans 383, the vehicle rear structure has the front and rear of the vehicle compared to the case where the power generation unit 10 and the exhaust unit 20 are arranged between the side members 381. The length of the side member 381 in the direction can be shortened.

  Furthermore, when a collision load from the rear of the vehicle is applied, the exhaust unit 20 and the enclosing member 40 are more easily deformed than the power generation unit 10. Therefore, when a collision load from the rear of the vehicle is applied to the rear of the vehicle body, the vehicle rear structure can deform the exhaust unit 20 and the enclosing member 40 integrally together with the crushing of the lower crash can 383.

Thus, the rear body structure can absorb the collision load from the rear of the vehicle by the lower crash can 383, the exhaust unit 20, and the enclosing member 40.
Therefore, by arranging the exhaust unit 20 between the lower crash cans 383 in the rear sub-frame 38, the rear body structure suppresses heat damage at the rear of the vehicle which suppresses weight increase and safety against a collision from the rear of the vehicle. And the improvement of the

  Further, the enclosure member 40 is provided with the upper right side wall portion 415 for guiding the wind of the blower fan 50 toward the power generation unit 10 and the first upper surface portion 413 b, so that the vehicle rear structure is the power generation unit 10 and The wind of the blower fan 50 can be blown to both sides of the exhaust unit 20.

  Furthermore, the vehicle body rear structure can blow the wind from the cooling fan to a heat generating device such as a converter disposed adjacent to the power generation unit 10, for example. Therefore, the vehicle rear structure can generate the flow of air in the entire rear of the vehicle.

  Therefore, by providing the enclosure 40 with the upper right side wall 415 of the upper enclosure 41 and the first upper surface portion 413 b for guiding the wind toward the power generation unit 10, the vehicle rear structure further increases the temperature rise of the vehicle rear. The heat damage at the rear of the vehicle can be more reliably suppressed because it can be reliably suppressed.

  In addition, since the catalyst (the upstream catalyst 22 and the downstream catalyst 23) and the silencer 24 are juxtaposed in the vertical direction of the vehicle, the vehicle rear structure can suppress the increase in weight and can further suppress the heat damage at the rear of the vehicle. The safety against a collision from the rear of the vehicle can be further improved.

  Specifically, by arranging the catalyst (upstream catalyst 22 and downstream catalyst 23) and the silencer 24 in parallel in the vertical direction of the vehicle, the vehicle rear structure has a catalyst (upstream catalyst 22 and downstream catalyst 23) and a silencer The lengths of the exhaust unit 20 and the enclosing member 40 in the longitudinal direction of the vehicle can be shortened as compared with the case where they are juxtaposed to the longitudinal direction 24 of the vehicle.

  Therefore, the vehicle rear portion structure can suppress the wind of the blower fan 50 introduced into the inside of the enclosure member 40 through the blower opening S2 from diffusing in the vehicle longitudinal direction. As a result, the rear structure of the vehicle body can flow the hot air inside the enclosing member 40 more efficiently to the outside without increasing the size of the blower fan 50.

  In addition, when a collision load from the rear of the vehicle is applied, the vehicle rear structure deforms the exhaust unit 20 so that the catalyst (the upstream catalyst 22 and the downstream catalyst 23) and the silencer 24 are separated in the vehicle vertical direction. It can be done. Thus, when the collision load from the rear of the vehicle is applied, the rear part structure of the vehicle can reduce the amount of movement of the exhaust unit 20 to the front of the vehicle, so that the intrusion of the exhaust unit 20 or the power generation unit 10 into the vehicle compartment It can prevent more reliably.

  Therefore, the vehicle rear structure can suppress the increase in weight and further suppress the heat damage at the rear of the vehicle by juxtaposing the catalyst (the upstream catalyst 22 and the downstream catalyst 23) and the silencer 24 in the vertical direction of the vehicle. It is possible to further improve the safety against a rear impact.

In correspondence with the configuration of the present invention and the above-described embodiment,
The catalyst of the present invention corresponds to the upstream catalyst 22 and the downstream catalyst 23 of the embodiment,
And so on
The introduction opening corresponds to the blowing opening S2,
The outlet of the exhaust pipe corresponds to the exhaust pipe outlet 21 a of the exhaust pipe 21,
The exhaust opening corresponds to the bottom opening S1,
The subframe corresponds to the rear subframe 38,
The left and right crash cans correspond to the left and right lower crash cans 383,
The air guiding portion corresponds to the upper right side wall portion 415 of the upper enclosing member 41 and the first upper surface portion 413 b,
The present invention is not limited to the configuration of the above-described embodiment, and many embodiments can be obtained.

For example, in the embodiment described above, the power generation unit 10 and the exhaust unit 20 are disposed along the vehicle longitudinal direction with the cross member 382 interposed therebetween, but the present invention is not limited thereto. 10 and the exhaust unit 20 may be disposed along the longitudinal direction of the vehicle.
In addition, although the enclosing member 40 configured by the upper enclosing member 41 and the lower enclosing member 42 is configured to surround six sides of the exhaust unit 20, if six sides of the exhaust unit 20 can be enclosed, the shape of the enclosing member is It may have an appropriate shape.

  In addition, although the upper right side wall portion 415 of the upper enclosing member 41 and the first upper surface portion 413b are the wind guiding portions for guiding the wind of the blower fan 50 to the power generation unit 10, the present invention is not limited thereto. The member 40 may be provided with a wind guide fin for guiding the power generation unit 10. Alternatively, it may be a duct or the like for guiding the wind introduced into the inside of the enclosing member 40 to the power generation unit 10.

  Further, although the air blowing opening S2 and the bottom opening S1 of the enclosing member 40 face each other in the direction intersecting the vehicle width direction, the present invention is not limited thereto. For example, the lower left side of the lower enclosing member 42 The exhaust pipe outlet 21a of the exhaust pipe 21 may be exposed from the wall portion 424, and the air blowing opening S2 and the bottom opening S1 may be opposed in the vehicle width direction. Alternatively, the blower fan 50 may be provided on the vehicle front side of the enclosing member 40, and the blower opening S2 and the bottom opening S1 may face each other in the vehicle longitudinal direction or in the direction intersecting with the vehicle longitudinal direction.

Although the blower fan 50 is mounted and fixed to the enclosing member 40, the present invention is not limited thereto. The blower fan 50 may be mounted and fixed to the rear sub-frame 38 or a bracket provided on the rear sub-frame 38. Good.
Further, although the configuration is such that air is blown into the inside of the enclosing member 40 via the air blowing opening S2, the invention is not limited thereto, and the enclosing member 40 and the air blowing fan 50 are connected by a duct, and via the duct and the air blowing opening S2. The air may be blown into the inside of the enclosing member 40.

DESCRIPTION OF SYMBOLS 1 ... Vehicle 10 ... Power generation unit 11 ... Generator 12 ... Power generation internal combustion engine 20 ... Exhaust unit 21 ... Exhaust pipe 21a ... Exhaust pipe outlet 22 ... Upstream catalyst 23 ... Downstream catalyst 24 ... Silencer 38 ... Rear sub frame 40 ... Enclosure Members 50: Blowing fans 381: Side members 382: Cross members 383 ... Lower crash cans 413b ... First upper surface portions 415 ... Upper right side wall portions S1 ... Bottom openings S2 ... Blowing openings

Claims (5)

A generator that generates electric power for traveling of a vehicle, and a power generation unit configured of an internal combustion engine for power generation that is a power source of the generator;
A vehicle rear portion structure comprising an exhaust unit connected to the power generation internal combustion engine, a catalyst, and an exhaust unit formed of a silencer in a vehicle rear portion of the vehicle,
An enclosure member surrounding six sides of the exhaust unit;
And a blower fan for blowing outside air to the inside of the enclosure member,
The enclosing member is
An introduction opening, which is an opening through which outside air is introduced through the blower fan;
And an exhaust opening having a portion corresponding to the outlet of the exhaust pipe.
The vehicle rear structure, wherein the introduction opening of the enclosing member is disposed opposite to the exhaust opening of the enclosing member. The rear of the vehicle body is
And a subframe having a cross member extending in the vehicle width direction,
The subframe is
The vehicle rear portion structure according to claim 1, wherein the exhaust unit and the enclosing member are supported at a rear side of the vehicle than the cross member. The sub-frame is
A pair of left and right side members extending in the longitudinal direction of the vehicle;
The cross member connecting the rear end of the side member in the vehicle width direction;
A pair of left and right crash cans extending rearward of the vehicle from a rear end of the side member;
The exhaust unit
The vehicle rear structure according to claim 2, disposed between the crash cans. The enclosing member is
The vehicle rear portion structure according to any one of claims 1 to 3, further comprising a wind guide portion that winds the wind of the blower fan toward the power generation unit. The vehicle rear portion structure according to any one of claims 1 to 4, wherein the catalyst and the silencer are juxtaposed in the vehicle vertical direction.

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