JP6136940B2 - Vehicle rear structure - Google Patents

Description

  The present invention relates to a vehicle rear structure.

  Patent Document 1 below discloses a technique related to a lower back that constitutes a rear portion of a vehicle. Specifically, the lower back includes a lower back reinforcement that extends along the vehicle width direction in the lower back panel and forms a closed cross section with the lower back panel. An extension is skewered with respect to the lower back reinforcement. In addition, Patent Document 2 below discloses a technique related to a vehicle rear portion structure.

JP 2001-171557 A JP 2008-246553 A

  In these prior arts, considering the load input from the rear suspension to the lower back during vehicle travel, there is room for further improvement in the rigidity of the lower back.

  In view of the above facts, an object of the present invention is to obtain a vehicle rear structure that can further improve the rigidity of the lower back.

The vehicle rear portion structure according to the present invention described in claim 1 constitutes a part of the lower back in the rear portion of the vehicle, the lower back panel extending along the vehicle vertical direction and the vehicle width direction, and the lower back panel It is arranged along the vehicle width direction on the front side in the vehicle front-rear direction, and a cross-sectional shape when cut along the vehicle front-rear direction forms a hat shape that swells toward the front side in the vehicle front-rear direction. A lower back reinforcement having a first main body portion constituting a first closed cross-section, and a vehicle width direction outer side of the lower back reinforcement and an upper side in the vehicle vertical direction of the lower back reinforcement along the vehicle vertical direction A lamp housing arranged in front of the vehicle and in the vehicle width direction outer side in the lower back reinforcement. A cross-sectional shape arranged along the vehicle vertical direction and cut along the horizontal direction forms a hat shape that swells toward the front side in the vehicle front-rear direction, and forms a second closed cross-section portion with the lamp housing A first vertical wall formed by being bent in the vehicle front-rear direction and provided on the outer side in the vehicle width direction of the first main body portion in the lower back reinforcement. And in the vertical column, an outer vertical wall provided on the vehicle width direction outer side in the second main body portion and formed along the vehicle vertical direction, and in the second main body portion in the vertical column , the outer vertical wall And a second vertical wall disposed so as to overlap the first vertical wall.

  In the vehicle rear structure according to the first aspect of the present invention, the lower back panel constituting a part of the lower back at the rear of the vehicle extends along the vehicle vertical direction and the vehicle width direction. A lower back reinforcement is disposed on the front of the lower back panel in the vehicle front-rear direction along the vehicle width direction. The lower back reinforcement has a hat shape in which the cross-sectional shape when cut along the vehicle front-rear direction swells toward the front side in the vehicle front-rear direction, and the first main body portion of the lower back reinforcement and the lower back panel The 1st closed cross-section part is comprised between.

  In addition, a lamp housing is disposed along the vehicle vertical direction on the vehicle vertical direction upper side of the lower back reinforcement on the vehicle width direction outer side of the lower back reinforcement. In addition, a vertical column is disposed along the vehicle vertical direction on the front of the lower back reinforcement in the vehicle front-rear direction. The vertical column has a hat shape in which a cross-sectional shape when cut along the horizontal direction swells toward the front side in the vehicle front-rear direction, and a second closed cross section between the second main body portion of the vertical column and the lamp housing. Part.

  A first vertical wall that is bent in the vehicle front-rear direction is formed on the outer side in the vehicle width direction of the lower back reinforcement. Thereby, in the lower back reinforcement, a reaction force can be obtained in the vehicle front-rear direction and the rigidity can be improved as compared with the case where the lower back reinforcement is formed linearly along the vehicle width direction. Can do.

  On the other hand, an outer vertical wall formed along the vehicle vertical direction is provided on the outer side in the vehicle width direction of the second main body portion of the vertical column. In addition, a second vertical wall is formed in the second main body portion continuously with the outer vertical wall, and the second vertical wall is disposed so as to overlap the first vertical wall. That is, a first wall surface (outer vertical wall and second vertical wall) that is continuous from the vertical column to the lower back reinforcement along the vehicle vertical direction is formed. Thereby, while being able to improve rigidity in a vertical column, a load can be transmitted to the said lower back reinforcement via the 1st vertical wall of a lower back reinforcement via the 1st wall surface of a vertical column. .

A vehicle rear portion structure according to a second aspect of the present invention is the vehicle rear portion structure according to the first aspect of the present invention, wherein the vehicle rear portion structure is provided on the inner side in the vehicle width direction of the second main body portion and faces the outer vertical wall. An inner vertical wall formed along the vehicle vertical direction and a third vertical wall formed continuously with the inner vertical wall in the second main body portion are provided.
In the vehicle rear portion structure according to the second aspect of the present invention, an inner vertical wall facing the outer vertical wall is provided on the inner side in the vehicle width direction of the second main body portion of the vertical pillar, and the inner vertical wall is It is formed along the vehicle vertical direction. The second main body portion is formed with a third vertical wall that is continuous with the inner vertical wall. That is, a second wall surface (an inner vertical wall and a third vertical wall) that is continuous from the vertical column to the lower back reinforcement along the vehicle vertical direction and the vehicle width direction is formed. Thereby, rigidity can be improved in the vertical column.
A vehicle rear portion structure according to a third aspect of the present invention is the vehicle rear portion structure according to the first aspect of the present invention, wherein the vehicle rear portion structure is formed on the second main body portion, and is formed at an upper portion in the vehicle vertical direction of the first main body portion. A third vertical wall is provided so as to overlap the formed upper wall .
In the vehicle rear part structure according to the third aspect of the present invention, the third main wall disposed so as to overlap the upper wall formed in the upper portion of the first main body in the vertical direction of the vehicle is the second main body having the vertical column. Therefore, the load can be transmitted from the vertical column to the lower back reinforcement through the upper wall of the lower back reinforcement.
A vehicle rear portion structure according to a fourth aspect of the present invention is the vehicle rear portion structure according to the first aspect of the present invention, wherein the vehicle rear portion structure is provided on the inner side in the vehicle width direction of the second main body portion and faces the outer vertical wall. An inner vertical wall formed along the vehicle vertical direction, and an upper wall formed continuously with the inner vertical wall in the second main body portion and formed in the upper portion of the first main body portion in the vehicle vertical direction. And a third vertical wall disposed so as to overlap.

In the vehicle rear structure according to the fourth aspect of the present invention, an inner vertical wall facing the outer vertical wall is provided on the inner side in the vehicle width direction of the second main body, and the inner vertical wall is in the vehicle vertical direction. It is formed along. In addition, a third vertical wall that is continuous with the inner vertical wall is formed in the second main body, and the third vertical wall overlaps with an upper wall formed in an upper portion of the first main body in the vehicle vertical direction. Arranged.

  A third vertical wall overlapping the upper wall of the lower back reinforcement is formed as a vertical column, and the third vertical wall is formed continuously with the inner vertical wall of the vertical column. That is, a second wall surface (an inner vertical wall and a third vertical wall) that is continuous from the vertical column to the lower back reinforcement along the vehicle vertical direction and the vehicle width direction is formed. Thereby, while being able to improve rigidity in a vertical pillar, a load can be transmitted to the said lower back reinforcement via the upper wall of a lower back reinforcement via the 2nd wall surface of a vertical pillar.

The vehicle rear portion structure according to the present invention as set forth in claim 5 is the vehicle rear portion structure according to any one of claims 1 to 4 , wherein an end portion in the vehicle width direction of the lower back reinforcement is provided. Is extended to the outside in the vehicle width direction of the vertical column.

In the vehicle rear structure according to the fifth aspect of the present invention, when the load is transmitted to the vertical column, the vehicle width direction end portion of the lower back reinforcement extends to the vehicle width direction outside of the vertical column. The load can be transmitted not only to the inside of the vertical column in the vehicle width direction but also to the outside of the vertical column in the vehicle width direction.

A vehicle rear portion structure according to a sixth aspect of the present invention is the vehicle rear portion structure according to any one of the first to fifth aspects, wherein the first closed cross-section portion is the first vertical section. It communicates in the vehicle width direction across the wall.

In the vehicle rear structure according to the sixth aspect of the present invention, since the first closed cross-section portion is communicated in the vehicle width direction across the first vertical wall, the lower back reinforcement has substantially the entire region in the vehicle width direction. A first closed cross section is provided over the entire area. That is, the required rigidity can be ensured over substantially the entire region of the lower back reinforcement in the vehicle width direction.

The vehicle rear portion structure according to the present invention described in claim 7 is the vehicle rear portion structure according to any one of claims 1 to 6 , wherein the lower end of the vertical column in the vehicle vertical direction is It joins to the lower flange extended from the vehicle up-down direction lower end part of the said 1st main-body part.

  For example, when the vertical bottom end of the vertical column is joined to the front wall of the first main body along the vertical direction of the vehicle, the vertical column and the first main body are applied to the load input from the rear suspension during traveling. The joint surface with the front wall of the part is arranged in a direction along the load input direction. For this reason, a shearing force acts on the joining part which joins both.

  On the other hand, in the vehicle rear structure according to the fifth aspect of the present invention, the lower end of the vertical column in the vertical direction of the vehicle is joined to the lower flange that extends from the lower end of the first main body in the vertical direction of the vehicle. I have to. Thereby, the shearing force acting on the joint can be dispersed with respect to the load input from the rear suspension during traveling. Therefore, as a result, the joint strength between the two can be increased.

  As described above, the vehicle rear portion structure according to the present invention according to the first aspect has an excellent effect that the rigidity of the lower back can be improved.

The vehicle rear structure according to the present invention described in claims 2 to 4 has an excellent effect that a load can be transmitted from the vertical column to the lower back reinforcement.

The vehicle rear structure according to the present invention described in claim 5 has an excellent effect that the load can be more effectively transmitted from the vertical column to the lower back reinforcement.

The vehicle rear structure according to the present invention described in claim 6 has an excellent effect of improving the secondary moment of section and suppressing deformation in the lower back.

The vehicle rear structure according to the seventh aspect of the present invention has an excellent effect that the bonding strength between the members can be increased.

It is the perspective view which looked at the vehicle from the diagonally left rear side. It is the approximate front view which looked at the principal part of the vehicle rear part structure concerning this embodiment from the vehicle interior side. It is the approximate front view which looked at the principal part of the vehicle rear part structure concerning this embodiment from the vehicle interior side. 2A is a cross-sectional view taken along line AA in FIG. 2, FIG. 2B is a cross-sectional view taken along line BB in FIG. 2, and FIG. It is sectional drawing cut | disconnected along C line. (A), (B) is a comparative example and is sectional drawing corresponding to FIG. 4 (A), (B), respectively.

  Hereinafter, embodiments of a vehicle rear structure according to the present invention will be described with reference to the drawings. In these drawings, an arrow FR appropriately shown indicates the vehicle front side, an arrow UP indicates the vehicle upper side, and an arrow OUT indicates the vehicle width direction outer side. Further, in the following description, when using the front / rear, top / bottom, and left / right directions, the front / rear direction of the vehicle body, the top / bottom direction of the vehicle body, and the left / right direction of the vehicle body (vehicle width direction) are indicated.

(Configuration of vehicle rear structure)
First, the configuration of the vehicle rear portion structure according to the present embodiment will be described. As shown in FIG. 1, a back door 16 for opening and closing a back door opening 14 that opens rearward in the vehicle front-rear direction is provided at the rear end of the vehicle (vehicle body) 12. Hinge members (not shown) are provided on the upper edge of the back door 16 on both sides in the vehicle width direction.

  The back door 16 rotates around the shaft centered on the hinge member, so that the back door opening 14 at the rear end of the vehicle 12 is opened and closed. 2 and 3 show a schematic front view of the main part of the vehicle rear structure according to the present embodiment as viewed from the vehicle interior side. In FIGS. The angle is slightly changed along the vehicle width direction so that the wall surfaces 35 and 37 can be seen.

As shown in FIG. 2, on the lower side of the back door opening 14, there is a plate-like lower back panel 20 that constitutes a part of the lower back 18 and extends along the vehicle vertical direction and the vehicle width direction. Is provided. A lamp housing 22 to which a light source (not shown) is attached is disposed outside the back door opening 14 in the vehicle width direction.

  Here, FIG. 4A shows a cross-sectional view taken along the line AA of FIG. 4B shows a cross-sectional view taken along line BB in FIG. 2, and FIG. 4C shows a cross-sectional view taken along line CC in FIG. Has been. As shown in FIGS. 4A and 4B, a lower back reinforcement 24 having a longitudinal direction in the vehicle width direction is disposed on the front surface 20A of the lower back panel 20 in the vehicle front-rear direction.

  As shown in FIG. 4A, the cross-sectional shape of the lower back reinforcement 24 when cut along the vehicle front-rear direction forms a hat shape that swells toward the front side in the vehicle front-rear direction. The main body portion 24A as the first main body portion of the lower back reinforcement 24 and the lower back panel 20 constitute a closed cross section 28 as a first closed cross section.

  The main body 24A of the lower back reinforcement 24 has a top wall 24A1 positioned at the upper part of the vehicle in the vertical direction and a lower back panel 20 positioned at the front of the vehicle in the vertical direction of the vehicle when cut along the vehicle longitudinal direction. And a front wall 24A2 arranged substantially parallel to the vehicle and a lower wall 24A3 located at the lower part in the vehicle vertical direction. An upper flange 24B extends upward from the end of the upper wall 24A1, and a lower flange 24C extends downward from the end of the lower wall 24A3.

  Further, as shown in FIG. 4B, the main body portion 24A of the lower back reinforcement 24 includes a front wall 24A2 and is cut along the horizontal direction in the cross-sectional view on the outer side in the vehicle width direction. A vertical wall 24A4 as a first vertical wall that inclines toward the lower back panel 20 as it goes outward in the vehicle width direction is bent in the vehicle front-rear direction. A lateral wall 24A5 disposed substantially parallel to the lower back panel 20 is provided outside the longitudinal wall 24A4 in the vehicle width direction.

  A side wall 24A6 that is inclined toward the lower back panel 20 as it goes outward in the vehicle width direction is provided on the outer side in the vehicle width direction of the lateral wall 24A5, and an outer side that extends outward in the vehicle width direction from the outer end of the side wall 24A6. A flange 24D is extended. In this case, the side wall 24A6, the horizontal wall 24A5, the vertical wall 24A4, the front wall 24A2 and the front surface 20A of the lower back panel 20 constitute a closed cross section 28. The closed cross-section portion 28 communicates in the vehicle width direction across the vertical wall 24A4.

  4A and 4B, the upper flange 24B, the lower flange 24C, and the outer flange 24D of the lower back reinforcement 24 are joined to the lower back panel 20 (joint portion 30). . In the present embodiment, the joining between members is performed by spot welding, laser welding, or the like, and the same applies to the following.

  Further, as shown in FIG. 2, a lamp housing 22 is disposed above the lower back reinforcement 24 at the vehicle width direction end portion of the lower back reinforcement 24. The lower end 22A of the lamp housing 22 is joined to the upper flange 24B of the lower back reinforcement 24 as shown in FIG.

As shown in FIG. 2, a side member outer panel (hereinafter referred to as “cymen outer”) 32 is joined to the outside of the lamp housing 22, the lower back reinforcement 24 and the lower back panel 20 in the vehicle width direction. Then, as shown in FIG. 4B, the vehicle width direction inner side end portion 32 </ b> A of the cylinder outer 32 is joined to the vehicle width direction outer edge portion 20 </ b> B of the lower back panel 20 and the outer flange 24 </ b> D of the lower back reinforcement 24. (Joining part 30).

  Here, in this embodiment, as shown in FIGS. 4A and 4B, a vertical column 34 is disposed along the vehicle vertical direction at the front part of the lamp housing 22 and the lower back reinforcement 24. Has been. As shown in FIG. 4C, the cross-sectional shape of the vertical column 34 when cut along the horizontal direction is a hat shape that swells toward the front side in the vehicle front-rear direction. The main body portion 34A as the second main body portion of the vertical column 34 and the lamp housing 22 constitute a closed cross-section portion 36 as a second closed cross-section portion.

  As shown in FIG. 4A, the main body 34A of the vertical column 34 has a front wall 34A1 positioned at the front part in the vehicle front-rear direction and a vehicle up-down direction in a cross-sectional view when cut along the vehicle front-rear direction. A lower wall 34A2 positioned at the lower portion of the direction, and a lower flange 34B extends downward from an end of the lower wall 34A2. The lower and lower walls 34A2 of the front wall 34A1 and the lower wall 34A2 of the main body 34A of the vertical column 34 are opposed to the front wall 24A2 and the lower wall 24A3 of the main body 24A of the lower back reinforcement 24, and the lower flange 34B of the vertical column 34 is The lower back panel 20 is joined to the lower edge 20C and the lower flange 24C of the lower back reinforcement 24 (joint 30).

  Further, in the main body 34A of the vertical column 34, as shown in FIG. 4C, the vehicle width of the front wall 34A1 in a cross-sectional view when cut along the horizontal direction at a position facing the lamp housing 22. On the outer side in the direction, an outer wall 34A3 that is inclined toward the lamp housing 22 side as it goes outward in the vehicle width direction is provided. An outer flange 34C extending outward in the vehicle width direction extends from the outer end portion of the outer wall 34A3. In addition, an inner wall 34A4 that is inclined toward the lamp housing 22 toward the inner side in the vehicle width direction is provided on the inner side in the vehicle width direction of the front wall 34A1, and the vehicle width direction is provided from the outer end portion of the inner wall 34A4. An inner flange 34D extending inward is extended. The outer flange 34C and the inner flange 34D are joined to the lamp housing 22 (joint portion 30).

  Further, in the main body 34A of the vertical column 34, as shown in FIG. 4B, the lower back reinforcement is viewed in a sectional view when cut along the horizontal direction at a position facing the lower back reinforcement 24. An outer vertical wall 34A5 serving as a second vertical wall is provided so as to overlap with the vertical wall 24A4 formed in 24.

  As shown in FIG. 3, the outer vertical wall 34A5 is a continuous wall surface 35 (the outer wall 34A3 and the outer vertical wall 34A5 as a first wall surface) continuously connected to the upper outer wall 34A3 of the main body 34A of the vertical column 34. ) And a ridge line P is formed from the vertical column 34 to the lower back reinforcement 24 along the vehicle vertical direction. The continuous wall surface 35 is inclined outward in the vehicle width direction toward the vehicle rear side.

  Further, the lateral wall 24A5 of the lower back reinforcement 24 is exposed from the vehicle width direction outer side of the vertical column 34. That is, the vehicle width direction end portion of the lower back reinforcement 24 extends to the outer side of the vertical column 34 in the vehicle width direction.

  On the other hand, as shown in FIG. 4C, the main body portion 34A of the vertical column 34 includes the front wall 34A1 and is cut along the horizontal direction, and the outer wall on the inner side in the vehicle width direction. An inner wall 34A4 facing 34A3 is formed along the vehicle vertical direction.

  As shown in FIG. 2, the inner wall 34A4 has a continuous wall surface 37 (inner wall) as a second wall continuously connected to an inner vertical wall 34A6 as a third vertical wall on the lower side of the main body 34A of the vertical column 34. 34A4 and inner vertical wall 34A6) are provided, and a ridge line Q is formed along the vehicle width direction of the lower back reinforcement 24 from the vehicle vertical direction of the vertical column 34. In addition, the continuous wall surface 37 inclines to the vehicle width inner side as it goes to the vehicle rear side.

(Operation and effect of vehicle rear structure)
Next, operations and effects of the vehicle rear structure according to the present embodiment will be described. As shown in FIG. 4A, the cross-sectional shape of the lower back reinforcement 24 cut along the vehicle front-rear direction is a hat shape that swells toward the front side. The main body 24A and the lower back panel 20 constitute a closed section 28. A vertical column 34 is disposed along the vehicle vertical direction at the front of the lamp housing 22 and the lower back reinforcement 24. As shown in FIG. 4C, the cross-sectional shape when the vertical column 34 is cut along the horizontal direction has a hat shape that swells toward the front side, and the main body 34A of the vertical column 34 and The lamp housing 22 forms a closed cross section 36.

  Thus, by forming the closed cross-section portions 28 and 36 between the members in the lower back 18, the cross-sectional secondary moment of the lower back 18 can be improved, and the rigidity of the lower back 18 can be improved.

  Here, in this embodiment, as shown in FIG. 4B, a vertical wall 24A4 that is bent in the vehicle front-rear direction is formed on the outer side in the vehicle width direction of the main body portion 24A of the lower back reinforcement 24. . As a result, as shown in FIG. 5B, a reaction force can be obtained in the vehicle front-rear direction compared to the case where the lower back reinforcement 100 is formed linearly along the vehicle width direction, Stiffness can be improved.

  On the other hand, as shown in FIG. 3, an outer wall 34A3 formed along the vehicle vertical direction is provided on the outer side in the vehicle width direction of the main body 34A of the vertical column 34. In addition, an outer vertical wall 34A5 that is continuously connected to the outer wall 34A3 is formed in the main body 34A below the outer wall 34A3. And this outer vertical wall 34A5 is arrange | positioned so that it may overlap with the vertical wall 24A4 of the lower back reinforcement 24 (refer FIG. 4 (B)). That is, the continuous wall surface 35 which continues along the vehicle up-down direction from the vertical column 34 to the lower back reinforcement 24 is provided, and the ridgeline P is formed.

  Thereby, rigidity can be improved in the vertical column 34, and a load is transmitted to the lower back reinforcement 24 via the continuous wall 35 of the vertical column 34 and the vertical wall 24A4 of the lower back reinforcement 24. be able to. That is, the load can be distributed from the vertical column 34 to the lower back reinforcement 24. For this reason, deformation of the closed cross section 28 of the lower back panel 20 is suppressed with respect to load input from the rear suspension (not shown) when the vehicle is traveling, and NV performance (noise and vibration performance) and steering stability performance are improved. Can be improved.

  Further, in the present embodiment, as shown in FIG. 4C, the main body 34A of the vertical column 34 includes a front wall 34A1 and is cut in a horizontal direction in the vehicle width direction. On the inner side, an inner wall 34A4 facing the outer wall 34A3 is formed along the vehicle vertical direction. As shown in FIG. 2, the inner wall 34A4 is provided with a continuous wall surface 37 continuously connected to the lower inner vertical wall 34A6 of the main body 34A of the vertical column 34. A ridge line Q along the vehicle width direction of the lower back reinforcement 24 is formed.

  Thereby, rigidity can be improved in the vertical column 34 and a load is transmitted to the lower back reinforcement 24 through the upper wall 24A1 of the lower back reinforcement 24 via the continuous wall surface 37 of the vertical column 34. be able to. That is, the load can be distributed from the vertical column 34 to the lower back reinforcement 24.

  Further, in the present embodiment, as shown in FIG. 4B, the vehicle width direction end portion of the lower back reinforcement 24 extends to the vehicle width direction outer side of the vertical column 34. Thereby, when a load from a rear suspension (not shown) during traveling is transmitted to the vertical column 34, the load is applied not only to the inner side of the vertical column 34 in the vehicle width direction but also to the outer side of the vertical column 34 in the vehicle width direction. Can communicate. For this reason, a load can be transmitted from the vertical column 34 to the lower back reinforcement 24 more effectively.

  In the present embodiment, as shown in FIG. 4B, the closed cross-section portion 28 constituted by the lower back reinforcement 24 and the lower back panel 20 straddles the vertical wall 24A4 of the lower back reinforcement 24. It communicates in the vehicle width direction. That is, the closed cross section 28 is provided over substantially the entire region of the lower back reinforcement 24 in the vehicle width direction.

  As a result, necessary rigidity can be ensured over substantially the entire region of the lower back reinforcement 24 in the vehicle width direction, and the sectional secondary moment can be improved and the deformation can be suppressed in the lower back 18 including the lower back panel 20. Can do. As a result, in the lower back 18, for example, the plate thickness of the lower back panel 20 can be reduced, and the weight can be reduced.

  Further, in the present embodiment, as shown in FIG. 4A, the lower part of the front wall 34A1 and the lower wall 34A2 in the main body part 34A of the vertical column 34 are the front wall 24A2 in the main body part 24A of the lower back reinforcement 24. And the lower flange 34B of the vertical column 34 is joined to the lower flange 24C of the lower back reinforcement 24 (joint portion 30).

  For example, as shown in FIG. 5A, it is assumed that the lower end portion of the vertical column 102 is joined to the front wall 100A1 along the vehicle vertical direction in the main body portion 100A of the lower back reinforcement 100 (joint portion 104). . In this case, the joint surface 104A between the vertical column 102 and the front wall 100A1 of the main body 100A of the lower back reinforcement 100 is along the load input direction with respect to the load input F from the rear suspension (not shown) during traveling. It will be arranged in the direction. For this reason, a shearing force acts on the joining part 104 which joins both.

  On the other hand, in this embodiment, as described above, the lower flange 34B of the vertical column 34 shown in FIG. 4A is joined to the lower flange 24C of the lower back reinforcement 24. Since the main body portion 24A of the lower back reinforcement 24 forms a closed section 28 with the lower back panel 20, the lower end of the vertical column 34 in the vehicle vertical direction extends from the front wall 24A2 of the main body portion 24A to the lower flange 24C. It has a rounded shape. Thereby, the shearing force acting on the joint 30 can be dispersed with respect to the load input F from the rear suspension (not shown) during traveling. Therefore, as a result, the joint strength between the two can be increased.

(Other embodiments)
In the present embodiment, for example, as shown in FIG. 3, the main body 34A of the vertical column 34 is provided with a continuous wall surface 35 in which an outer wall 34A3 and an outer vertical wall 34A5 are continuous along the vehicle vertical direction. A ridge line P is formed. The ridgeline P is not limited to one. That is, in the vertical column 34, since the ridge line along the vehicle vertical direction only needs to extend along the vehicle vertical direction of the lower back reinforcement 24, the continuous wall surface 35 is not necessarily formed by one curved surface or straight line. Absent. Further, the continuous wall surface 37 is not limited as long as the ridge line along the vertical direction of the vehicle extends along the vehicle width direction of the lower back reinforcement 24 in the vertical column 34. There is no need to form a single curved surface or straight line.

  In the present embodiment, as shown in FIG. 4B, the closed cross-section portion 28 constituted by the lower back reinforcement 24 and the lower back panel 20 straddles the vertical wall 24A4 of the lower back reinforcement 24. It communicates in the vehicle width direction. However, since it is only necessary to ensure the rigidity of the lower back 18, the closed cross-sectional portion 28 does not necessarily need to communicate with the vertical wall 24 </ b> A <b> 4 of the lower back reinforcement 24 in the vehicle width direction.

  Furthermore, in this embodiment, as shown in FIG. 4A, the lower flange 34B of the vertical column 34 is joined to the lower flange 24C of the lower back reinforcement 24, but the lower flange 34B is not necessarily the lower flange. It is not what is joined to 24C. For example, the lower wall 24A3 or the front wall 24A2 may be used.

  Although one embodiment of the present invention has been described above, the present invention is not limited to the above, and various modifications other than the above can be implemented without departing from the spirit of the present invention. Of course.

12 Vehicle 18 Lower back 20 Lower back panel 22 Lamp housing 24 Lower back reinforcement 24A Main body (first main body)
24A1 Upper wall 24A4 Vertical wall (first vertical wall)
24C Lower flange 28 Closed section (first closed section)
34 Vertical column 34A Main body (second main body)
34A3 outer wall 34A4 inner wall 34A5 outer vertical wall (second vertical wall)
34A6 Inner vertical wall (third vertical wall)
35 Continuous wall surface 36 Closed section (second closed section)
37 continuous wall

Claims (7)

A lower back panel that constitutes a part of the lower back at the rear of the vehicle and extends along the vehicle vertical direction and the vehicle width direction;
The lower back panel is disposed along the front-rear direction of the vehicle along the vehicle width direction, and the cross-sectional shape when cut along the front-rear direction of the vehicle forms a hat shape that swells toward the front side of the front-rear direction of the vehicle, Lower back reinforcement provided with a first main body portion that constitutes a first closed cross-section portion with the lower back panel;
A lamp housing disposed along the vehicle vertical direction on the vehicle width direction outer side in the lower back reinforcement and on the vehicle vertical direction upper side of the lower back reinforcement;
A hat-shaped shape that is disposed along the vehicle vertical direction on the front side in the vehicle front-rear direction on the outer side in the vehicle width direction in the lower back reinforcement, and has a cross-sectional shape that bulges toward the front side in the vehicle front-rear direction when cut along the horizontal direction. A vertical column provided with a second main body portion that constitutes a second closed cross-sectional portion with the lamp housing;
With
In the lower back reinforcement, a first vertical wall provided on the vehicle width direction outer side of the first main body portion and formed by bending in the vehicle front-rear direction,
In the vertical column, an outer vertical wall that is provided on the outer side in the vehicle width direction of the second main body portion and is formed along the vehicle vertical direction;
A second vertical wall disposed in the second main body portion of the vertical column so as to be continuous with the outer vertical wall and to overlap the first vertical wall;
A vehicle rear structure having: An inner vertical wall provided on the inner side in the vehicle width direction of the second main body portion and formed along the vehicle vertical direction facing the outer vertical wall;
A third vertical wall which is formed continuously with the inner vertical wall in the second body portion,
The vehicle rear portion structure according to claim 1, wherein: The vehicle rear portion according to claim 1 , further comprising a third vertical wall formed on the second main body portion and disposed so as to overlap with an upper wall formed on an upper portion of the first main body portion in the vehicle vertical direction. Construction. An inner vertical wall provided on the inner side in the vehicle width direction of the second main body portion and formed along the vehicle vertical direction facing the outer vertical wall;
A third vertical wall that is formed continuously with the inner vertical wall in the second main body portion and is disposed so as to overlap with an upper wall formed in an upper portion of the first main body portion in the vehicle vertical direction;
The vehicle rear portion structure according to claim 1 , wherein: The vehicle rear portion structure according to any one of claims 1 to 4, wherein an end portion in the vehicle width direction of the lower back reinforcement extends to an outer side in the vehicle width direction of the vertical column . The vehicle rear portion structure according to any one of claims 1 to 5, wherein the first closed cross-section portion communicates in the vehicle width direction across the first vertical wall. The vehicle according to any one of claims 1 to 6, wherein a lower end of the vertical column in the vehicle vertical direction is joined to a lower flange extending from a lower end of the first main body in the vertical direction of the vehicle. Rear structure.

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