Vehicle rear structure

Abstract

To effectively upgrade the rigidity of a portion of a vehicle rear part whose collision performance is desired to be upgraded while suppressing an increase in a weight.SOLUTION: A vehicle rear structure includes: a floor panel 10; and side members 20 disposed on external sides in a width direction of the floor panel 10. A tail end member 30 extending in the width direction is joined to the rear ends of the side members 20. Swollen parts 25 swollen downward in a vehicle as proceeding rearward in the vehicle are formed respectively in rear parts of the side members 20. A length in the width direction of a bottom 25a of the swollen part 25 is configured to be smaller than a bottom 21a of the side member 20 located in front of the swell part 25 in the vehicle.SELECTED DRAWING: Figure 3

Description

Technical Field

[0001] The present invention relates to a vehicle rear structure.

Background Art

[0002] As disclosed in Patent Document 1, a structure in which a rear end panel is provided is known for the structure at the rear of a vehicle. The rear end panel is joined to the rear portions of rear side frames provided on the left and right of a rear floor panel.

[0003] In the structure of this example, in order to improve the collision performance at the rear of the vehicle, a crash can for shock absorption is provided. Further, in order to improve the rigidity of the rear of the vehicle, two closed cross-section structures extending in the vehicle width direction are provided at intervals in the vertical direction at the rear of the rear end panel. The cross-sectional areas of these closed cross-section structures are configured to be different.

[0004] For example, in the structure disclosed in Patent Document 1, the upper closed cross-section structure is formed to have a smaller cross-sectional area than the lower closed cross-section structure. Thereby, while ensuring rigidity, the back door opening can be expanded in the vertical direction, the vertical step between the rear floor panel and the lower edge of the door opening is reduced, and a luggage compartment that is easy to load and unload luggage is formed.

Prior Art Documents

Patent Documents

[0005]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0006] However, increasing the cross-sectional area of ​​the closed section structure located on the lower side, as in the example above, increases the weight of the rear end panel. While this ensures rigidity, it can lead to an excessive increase in weight. Therefore, in the example above, there was room for improvement in order to suppress the weight increase at the rear of the vehicle while improving the rigidity of the rear of the vehicle by limiting the areas where rigidity needs to be ensured to some extent and effectively improving the rigidity of those areas.

[0007] The present invention was made to solve the above problems, and its objective is to provide a vehicle rear structure that can effectively improve the rigidity of the part of the vehicle rear where collision performance is to be improved, while suppressing an increase in weight. [Means for solving the problem]

[0008] To achieve the above objective, the vehicle rear structure according to the present invention comprises a floor panel constituting the vehicle body floor portion, and a pair of side members provided on both outer sides in the vehicle width direction of the floor panel and extending in the vehicle longitudinal direction, wherein a tail end member extending in the vehicle width direction is joined to the rear end of the side members. In this vehicle rear structure, the rear of the side members is provided with a bulge portion that bulges downward toward the rear of the vehicle, the length of the bottom surface of the bulge portion in the vehicle width direction is set to gradually decrease from the front to the rear of the bulge portion, and the length of the rear of the bottom surface of the bulge portion in the vehicle width direction is set to be smaller than the bottom surface of the side member located in front of the vehicle than the bulge portion. The side member includes side walls that extend upward from both sides of the bottom surface in the vehicle width direction and are spaced apart from each other. Cross section of the side member The bottom surface and the side walls have a U-shaped cross-sectional portion that opens upwards towards the vehicle, and the U-shaped cross-sectional portion The length in the width direction of the vehicle is, The length of the distance between the side walls in the vehicle width direction is as follows: The vehicle is shaped to become wider towards the rear. [Effects of the Invention]

[0009] According to the present invention, it is possible to effectively improve the rigidity of the part of the rear of the vehicle where the collision performance is to be improved, while suppressing an increase in weight. [Brief explanation of the drawing]

[0010] [Figure 1] This is a perspective view of one embodiment of the vehicle rear structure according to the present invention, as seen from the rear of the vehicle. [Figure 2] This is a magnified view of the area around the bulging portion of the side member in Figure 1. [Figure 3] This is a cross-sectional view taken along the line AA in Figure 2. [Figure 4] Figure 1 is a perspective view of the bulge as seen from the front of the vehicle. [Figure 5] Figure 1 is a rear view of the absorber and its surrounding area. [Modes for carrying out the invention]

[0011] Hereinafter, one embodiment of the vehicle understructure of the vehicle according to the present invention will be described with reference to the drawings (Figures 1 to 5). In the figures, the direction of arrow Fr indicates the front in the longitudinal direction of the vehicle. In the description of the embodiment, "front (front end) and rear (rear end)" correspond to the front and rear of the vehicle in the longitudinal direction. Arrows R and L indicate the right and left sides as seen from the perspective of an occupant looking forward of the vehicle. Arrow D indicates the area below the vehicle.

[0012] As shown in Figures 1 to 4, the rear vehicle structure of this embodiment comprises a floor panel 10 made of metal material that constitutes the vehicle body floor, a tail end member 30 positioned at the rear of the vehicle, a pair of side members 20 extending in the vehicle's longitudinal direction and provided on both outer sides in the vehicle width direction of the floor panel 10, and a rear cross member 13. In addition, a rear bumper (not shown) extending in the vehicle width direction is positioned on the rear side of the tail end member 30. The structure of each component will be described below.

[0013] As shown in Figure 1, the tail end member 30 is a panel member, for example, made of metal, that is provided at the rear of the floor panel 10 and extends in the vehicle width direction. The lower part of the tail end member 30 is provided with a wall portion that extends in the vehicle width direction, and this wall portion has a rear wall surface 33 facing the rear of the vehicle and a front wall surface 35 facing the front of the vehicle. An absorber 50, which will be described later, is attached to the rear wall surface 33 via a rear mounting panel 40. The rear mounting panel 40 and the absorber 50 will be described later. In addition, the floor panel 10 and the rear cross member 13 are joined to the front wall surface 35 of the wall portion of the tail end member 30.

[0014] Furthermore, the upper part of the tail end member 30 bulges outwards towards the rear of the vehicle. That is, the upper side of the rear wall surface 33 bulges outwards towards the rear of the vehicle. At the upper end of the bulging portion of the tail end member 30, in the middle in the vehicle width direction, a recess 31 is provided that is recessed downwards towards the vehicle, and the bottom of the recess 31 extends in the vehicle width direction. The recess 31 is located below the back door opening 15 provided at the rear of the vehicle body. That is, the recess 31 constitutes the lower opening edge of the back door opening 15. The back door opening 15 is an opening that is opened and closed by a back door (not shown). The tail end member 30 only needs to be located behind the side member 20, which will be described later. The front wall surface 35 and the rear wall surface 33 may also be made of separate components.

[0015] Next, the side member 20 will be described. The side member 20 is a highly rigid member that constitutes the vehicle body frame and is made of metal. As shown in Figures 1 to 3, the side member 20 is provided on the outer side in the vehicle width direction of the floor panel 10 and extends in the vehicle longitudinal direction. The side member 20 in this embodiment has a member body 21 that extends in the vehicle longitudinal direction, a bulging member (bulge portion) 25 provided at the rear of the member body 21 and extending in the vehicle longitudinal direction, and an upper panel 27, and these together constitute the side member 20. The structures of the member body 21, the bulging member 25, and the upper panel 27 will be described below.

[0016] As shown in FIGS. 2 and 3, the member body 21 extends in the vehicle longitudinal direction and is joined to the outer portion in the vehicle width direction of the floor panel 10. The member body 21 has a U-shaped cross-sectional shape that opens upward in the vehicle, and a flange 22 is provided at the side edge portion of the opening formed in the upper portion of the member body 21. The flange 22 is joined to the lower surface of the upper panel 27 by spot welding or the like.

[0017] As shown in FIGS. 2 and 3, the bulging member 25 is provided at the rear portion of the side member 20. The bulging member 25 has a U-shaped cross-sectional shape that opens upward in the vehicle, similar to the member body 21, and a flange 26 is provided at the side edge portion of the opening formed in the upper portion of the bulging member 25. The flange 26 is joined to the lower surface of the upper panel 27 by spot welding or the like. Further, as shown in FIG. 4, the side wall 25b of the bulging member 25 is connected so as to be continuous with the side wall 21b of the member body 21. In addition, a front mounting panel 60 that extends in the vehicle vertical direction is provided at the rear portion of the bulging member 25. In the present embodiment, the front mounting panel 60 is joined to the front wall surface 35 of the tail end member 30 along the rear end of the bulging member 25. That is, the rear end of the bulging member 25 is joined to the front wall surface 35 of the tail end member 30 via the front mounting panel 60. By providing the front mounting panel 60, it is possible to improve the assembling performance of the bulging member 25.

[0018] The upper panel 27 is a member that extends in the vehicle longitudinal direction and is a plate-like member that closes the openings in the upper portions of the member body 21 and the bulging member 25 (FIG. 1). The inner portion in the vehicle width direction of the upper panel 27 is joined to the outer portion in the vehicle width direction of the floor panel 10. Further, among the side edge portions of the member body 21, the flange 22 arranged on the inner side in the vehicle width direction, the upper panel 27, and the floor panel 10 are joined in a three-layer stack. Similarly, among the side edge portions of the bulging member 25, the flange 26 arranged on the inner side in the vehicle width direction, the upper panel 27, and the floor panel 10 are joined in a three-layer stack.

[0019] As shown in FIGS. 3 and 4, the bulging member 25 bulges downward of the vehicle as it goes toward the rear of the vehicle. In this example, the bottom surface 25a provided at the lower part of the bulging member 25 faces downward of the vehicle and is a curved surface having a predetermined curvature, and is curved downward of the vehicle as it goes toward the rear of the vehicle. Further, as shown in FIG. 2, the length X2 in the width direction of the bottom surface 25a of the bulging member 25 is set to be smaller than the length X1 in the width direction of the bottom surface 21a of the member body 21 located in front of the vehicle with respect to the bulging member 25. Here, the width direction of the bulging member 25 and the member body 21 corresponds to the vehicle width direction.

[0020] As shown in FIG. 2, the length in the width direction of the bottom surface 25a of the bulging member 25 is set to gradually decrease as it goes toward the rear of the vehicle. In this example, both ends in the width direction of the bottom surface 25a of the bulging member 25 are formed to approach each other as it goes toward the rear of the vehicle. Further, a curved portion 25d is provided at the lower part of the side wall 25b of the bulging member 25. The curved portion 25d curves from the lower end of the side wall 25b toward the center in the width direction of the bulging member 25 as it goes downward of the vehicle, and is connected to the side portion of the bottom surface 25a. Note that by forming the length X2 of the bottom surface 25a to be short, the bottom surface 25a may be configured to be a part of the curved portion 25d. That is, the bottom surface 25a may be a convex curved shape below the vehicle together with the curved portion 25d.

[0021] By providing a bulging member 25 at the rear of the side member 20, the diameter (cross-section) of the side member 20 is increased. In this example, the vertical dimension of the bulging member 25 in the vehicle direction is increased compared to the member body 21. As a result, the side member 20 becomes more susceptible to impacts from the rear of the vehicle. In other words, impact loads are more easily applied to the rear of the side member 20. Furthermore, by setting the width of the bottom surface 25a of the bulging member 25 as described above, it becomes possible to increase the amount of downward bulging of the bulging member 25 without interfering with other members. As a result, the cross-sectional area of ​​the side member 20 is increased, allowing it to receive impacts from the rear of the vehicle over a wider area. Consequently, impact loads can be effectively transmitted to the front of the vehicle via the side member 20. In addition, by providing a curved portion 25d, the degree of freedom when arranging members in the area between the left and right bulging members 25 is improved.

[0022] Furthermore, the bulging member 25 of the side member 20 allows it to effectively receive the collision load, thus suppressing weight increase compared to a structure that increases rigidity against impact loads by providing a closed cross-section structure or the like in the tail end member 30. In addition, because the bulging member 25 bulges downwards from the vehicle, it is possible to suppress collision objects from penetrating underneath the vehicle body, thereby suppressing damage to components located on the underside of the floor panel 10.

[0023] The length of the side member 20 in the vehicle width direction in its cross-section is formed to widen towards the rear of the vehicle. In this example, the widthwise length of the bulging member 25 is formed to widen towards the rear of the vehicle. For example, as shown in Figure 2, the widthwise length Y2 at the rear of the bulging member 25 is set to be longer than the widthwise length Y1 at the front. This increases the cross-sectional area of ​​the bulging member 25 and improves the rigidity of the rear of the side member 20.

[0024] Furthermore, in this embodiment, an absorber 50 is provided on the outer portion in the vehicle width direction of the rear wall surface (rear surface) 33 of the tail end panel (Figures 1 to 5) at a position that overlaps with the bulging member 25 when viewed from the rear of the vehicle. In this example, as shown in Figures 1 and 5, a mounting panel 40 extending in the vehicle vertical direction is joined to the rear wall surface 33 of the tail end member 30 at a position corresponding to the bulging member 25 of the side member 20 by bolts or the like. Also, the front mounting panel 60 and the rear mounting panel 40 are arranged to overlap when viewed from the front or rear direction. As shown in Figure 5, the rear mounting panel 40 is provided with bolt holes and a locking portion 41 for locking the absorber 50. The locking portion 41 protrudes from the rear surface of the rear mounting panel 40 toward the rear of the vehicle and has a hook shape that bends toward the vehicle.

[0025] On the other hand, the front of the absorber 50 is provided with a locking hole 54a into which the locking portion 41 is inserted. With the locking portion 41 inserted into the locking hole 54a and hooked in place, the front of the absorber 50 is attached to the rear mounting panel 40. The connection between the front of the absorber 50 and the rear mounting panel 40 will be explained later.

[0026] As shown in Figure 2, the absorber 50 in this embodiment extends outward in the vehicle width direction as it approaches the rear of the vehicle, and at least a portion of the rear end of the absorber 50 is positioned outward in the vehicle width direction than the bulging member 25. In this example, the outward portion in the vehicle width direction at the rear end of the absorber 50 is positioned outward in the vehicle width direction than the outward portion in the vehicle width direction of the bulging member 25. This makes it possible to receive collision loads in an area that extends outward from the bulging member 25 of the side member 20 when viewed from the rear of the vehicle. In addition, the direction of deformation of the absorber 50 can be guided to open outward, resulting in stable impact absorption performance.

[0027] Furthermore, as shown in Figures 1 and 5, the absorber 50 has a lower member 51 and an upper member 53. The lower member 51 is box-shaped and opens upwards on the vehicle, and has a bottom surface 51d, a rear end surface 51a, and left and right side walls 51b. The upper member 53 is a cover that fits over the lower member 51 from above the vehicle, and has a top surface 53d, a rear end surface 53a, and left and right side walls 53b. The rear end surface 53a of the upper member 53 is joined to the upper part of the rear end surface 51a of the lower member 51 by overlapping it from the rear of the vehicle. Similarly, each of the left and right side walls 53b of the upper member 53 is joined to each of the left and right side walls 51b of the lower member 51 by covering them from the outside.

[0028] As shown in Figure 2, the length of the absorber 50 in the vehicle width direction is set to be longer than the width direction length of the bulging member 25 of the side member 20, and the length of the absorber 50 in the vehicle vertical direction (distance between the top surface 53d and the bottom surface 51d) is set to be shorter than the length of the bulging member 25 at the rear end in the vehicle vertical direction. In this example, the distance between the front of the top surface 53d and the front of the bottom surface 51d is about half the vertical dimension of the rear end of the bulging member 25. In addition, the cross-sectional area of ​​the absorber 50 is set to be smaller than the cross-sectional area of ​​the bulging member 25 of the side member 20.

[0029] This makes it possible to first transmit the impact load to the bulging member 25 of the side member 20 using the absorber 50. Since the absorber 50 is wider than the bulging member 25 in the width direction, the load is easily transmitted to the outer shape (cross-sectional contour shape) of the side member 20. Therefore, load transmission to the side member 20 can be performed efficiently. If the shape of the side member 20 and the shape of the absorber 50 were the same diameter, the rigidity of the absorber 50 would be high, making it difficult to absorb impact. In contrast, by setting the cross-sectional area of ​​the absorber 50 as described above, impact can be absorbed effectively.

[0030] Furthermore, in this embodiment, as shown in Figures 4 and 5, the length of the absorber 50 in the vehicle's vertical direction is formed to decrease as it approaches the rear of the vehicle. In addition, the front part of the absorber 50 is provided with a joint that is joined to the rear wall surface 33 of the tail end member 30. Furthermore, the joint of the absorber 50 in this embodiment has an upper joint 54 and a lower joint 52.

[0031] The upper joint portion 54 is a flange-like portion that protrudes upward from the front end of the upper surface 53d of the upper member 53 toward the vehicle. The upper joint portion 54 is fastened to the rear mounting panel 40 by bolts. Furthermore, as described above, the upper joint portion 54 has a locking hole 54a into which the locking portion 41 of the rear mounting panel 40 catches.

[0032] The lower joint portion 52 is a flange-like portion that protrudes downward from the front end of the bottom surface 51d of the lower member 51. The lower joint portion 52 is fastened to the rear mounting panel 40 by bolts, similar to the upper joint portion 54. In this example, the lower joint portion 52 extends in the vehicle width direction at a position corresponding to the lower part of the bulging member 25. The upper end of the lower joint portion 52 and the lower end of the bulging member 25 are positioned so that they are at approximately the same position in the vehicle's vertical direction.

[0033] When an impact load is applied to the absorber 50 located at the rear of the vehicle, stress concentrates due to the short vertical length of the absorber 50, causing the absorber 50 to deform from the rear and absorb the impact load. In this example, the absorber 50 is set so that its vertical dimension increases towards the front, and the lower joint portion 52 has a shape that follows the bulging member 25, which makes it easier for the impact load to be distributed to the side member 20.

[0034] Furthermore, the absorber 50 of this embodiment has an upper surface 53d facing upwards on the vehicle, and side walls 51b, 53b extending downwards on the vehicle from both ends of the upper surface 53d in the vehicle width direction. The upper surface 53d of the upper member 53 has a protrusion 53f. The protrusion 53f is located in the middle of the upper surface 53d in the width direction, protrudes upwards on the vehicle by the side walls 53b, and extends in the vehicle front-rear direction. On the other hand, the bottom surface 51d of the lower member 51 has a recess 51f in the middle of the vehicle width direction that is recessed upwards on the vehicle.

[0035] The recess 51f is positioned to correspond to the protrusion 53f. The recess 51f is positioned to overlap the bottom surface 25a of the bulging member 25 when viewed from the rear. As shown in Figure 5, the absorber 50 of this embodiment has a convex shape formed overall, with the central part in the vehicle width direction protruding upwards from the vehicle, by the protrusion 53f on the upper surface 53d of the upper member 53 and the recess 51f on the bottom surface 51a of the lower member 51.

[0036] The bottom surface 25a of the bulging member 25 constituting the side member 20 and the bottom surface 51d of the absorber 50 overlap, allowing the side member 20 to undergo axial compression deformation when it deforms. Here, axial compression deformation means that the side member 20 does not bend vertically or horizontally, but rather deforms mainly by contracting, like a bellows hose expanding and contracting, while maintaining a constant load direction. By deforming in this way, the shock absorption efficiency can be further improved.

[0037] Furthermore, the absorber 50 in this embodiment is a hollow columnar shape composed of an upper member 53 and a lower member 51, and notches 57 are provided on the rear end faces 51a and 53a of the absorber 50. The notches 57 are provided on the outer side in the vehicle width direction of the rear end face 53a of the upper member 53 and on the outer side in the vehicle width direction of the rear end face 51a of the lower member 51, and the notches 57 formed on each rear end face 51a and 53a form through holes that penetrate in the vehicle's longitudinal direction. The parts where the notches are provided are more vulnerable to impact loads from the rear of the vehicle compared to other parts. Therefore, impact absorption can be performed more effectively.

[0038] Furthermore, the tip of the absorber 50 is reliably crushed, making it easier for the absorber 50 to absorb the load. In addition, a notch 57 is provided near the corner at the rear end of the absorber 50, making it possible to weaken the corner, which tends to be highly rigid. As a result, this configuration makes it easier to crush under impact load.

[0039] In this embodiment, the rear cross member 13 is joined to the tail end member 30 and the bulging member 25. As shown in Figure 4, a lower flange 13a extending in the vehicle width direction is provided at the lower rear of the rear cross member 13, and this lower flange 13a is joined to the front wall surface (front part) 35 of the tail end member 30 by spot welding or the like. An upper flange 13b extending in the vehicle width direction is provided at the upper front of the rear cross member 13, and this upper flange 13b is joined to the lower surface of the floor panel 10 by spot welding or the like. An outer flange 13d extending in the vehicle longitudinal direction is provided at the lower outer part of the rear cross member 13 in the vehicle width direction, and this outer flange 13d is joined to the side wall 25b of the bulging member 25. The outer part of the upper flange 13b in the vehicle width direction may also be joined to the flange 26 of the bulging member 25.

[0040] This makes it possible to broaden the range over which load can be transmitted to the bulging member 25. Furthermore, since the rigidity of the bulging member 25 is improved, it becomes possible to suppress deformation of the bulging member 25, thereby improving collision performance. In addition, since the bulging member 25 and the member body 21 are made of separate components, it becomes possible to change the thickness.

[0041] The description of this embodiment is illustrative for explaining the present invention and does not limit the invention as described in the claims. Furthermore, the configuration of each part of the present invention is not limited to the above embodiment, and various modifications are possible within the technical scope described in the claims.

[0042] In this embodiment, the bottom surface 25a of the bulging member 25 is curved, but is not limited to this. For example, the bottom surface 25a of the bulging member 25 may be formed to incline downwards as it approaches the rear of the vehicle. Also, in this embodiment, the member body 21 and the bulging member 25 are separate components, but for example, they may be constructed as an integral part. [Explanation of Symbols]

[0043] 10 Floor Panels 13 Rear cross member 13a Lower flange 13b Upper flange 13d outer flange 15. Back door opening 20 Side Members 21 Member Body 21a Bottom 21b Side wall 22 Flange 25 Bulging member (bulging part) 25a Bottom 25b side wall 25d curved section 26 Flange 30 Tail end member 31 Recess 33 Rear wall 35 Front wall 40 Rear mounting panel 41 Locking part 50 Absorbers 51 Lower part 51a Rear end surface 51b side wall 51d Bottom 51f recess 52 Lower joint 53 Upper member 53a Rear end surface 53b side wall 53d top surface 53f convex part 54 Upper joint 54a Locking hole 57 Notches 60 Front mounting panel

Claims

1. It comprises a floor panel that constitutes the vehicle body floor, and a pair of side members provided on both outer sides in the vehicle width direction of the floor panel and extending in the vehicle front-rear direction, In a rear vehicle structure, a tail end member extending in the vehicle width direction is joined to the rear end of the aforementioned side member, The rear of the aforementioned side member is provided with a bulge that extends downwards towards the rear of the vehicle. The length of the bottom surface of the bulge in the vehicle width direction is set to gradually decrease from the front to the rear of the bulge, and the length of the rear of the bottom surface of the bulge in the vehicle width direction is set to be smaller than the bottom surface of the side member located in front of the vehicle than the bulge. The side member includes side walls that extend upward from both sides of the bottom surface in the vehicle width direction and are spaced apart from each other. The rear vehicle structure is characterized in that the cross-section of the side member has a U-shaped portion that opens upward toward the vehicle due to the bottom surface and the side wall, the length in the vehicle width direction of the U-shaped portion is the length in the vehicle width direction of the distance between the side walls, and the structure is formed to widen towards the rear of the vehicle.

2. It comprises a floor panel that constitutes the vehicle body floor, and a pair of side members provided on both outer sides in the vehicle width direction of the floor panel and extending in the vehicle front-rear direction, In a rear vehicle structure, a tail end member extending in the vehicle width direction is joined to the rear end of the aforementioned side member, The rear of the aforementioned side member is provided with a bulge that extends downwards towards the rear of the vehicle. The length of the bottom surface of the bulge in the vehicle width direction is set to gradually decrease from the front to the rear of the bulge, and the length of the rear of the bottom surface of the bulge in the vehicle width direction is set to be smaller than the bottom surface of the side member located in front of the vehicle than the bulge. An absorber is provided on the outer side in the vehicle width direction of the rear surface of the tail end member at a position that overlaps with the bulging portion when viewed from the rear of the vehicle. The absorber extends outward in the vehicle width direction as it approaches the rear of the vehicle, and at least a portion of the rear end of the absorber is positioned outward in the vehicle width direction from the bulging portion. The length of the absorber in the vehicle's vertical direction is formed to decrease as it approaches the rear of the vehicle. The front portion of the absorber is provided with a joint that is joined to the rear surface of the tail end member. The vehicle rear structure is characterized in that the joint portion includes a lower joint portion that extends in the vehicle width direction at a position corresponding to the lower part of the bulging portion.

3. It comprises a floor panel that constitutes the vehicle body floor, and a pair of side members provided on both outer sides in the vehicle width direction of the floor panel and extending in the vehicle front-rear direction, In a rear vehicle structure, a tail end member extending in the vehicle width direction is joined to the rear end of the aforementioned side member, The rear of the aforementioned side member is provided with a bulge that extends downwards towards the rear of the vehicle. The length of the bottom surface of the bulge in the vehicle width direction is set to gradually decrease from the front to the rear of the bulge, and the length of the rear of the bottom surface of the bulge in the vehicle width direction is set to be smaller than the bottom surface of the side member located in front of the vehicle than the bulge. A rear vehicle structure characterized in that a rear cross member extending in the vehicle width direction is joined to the front part of the tail end member, and the outer part of the rear cross member in the vehicle width direction is joined to the inner part of the bulging portion in the vehicle width direction.

4. An absorber is provided on the outer side in the vehicle width direction of the rear surface of the tail end member at a position that overlaps with the bulging portion when viewed from the rear of the vehicle. The rear vehicle structure according to claim 1, characterized in that the absorber extends outward in the vehicle width direction as it approaches the rear of the vehicle, and at least a portion of the rear end of the absorber is positioned outward in the vehicle width direction from the bulging portion.

5. The length of the absorber in the vehicle's vertical direction is formed to decrease as it approaches the rear of the vehicle. The front portion of the absorber is provided with a joint that is joined to the rear surface of the tail end member. The vehicle rear structure according to claim 4, characterized in that the joint portion includes a lower joint portion extending in the vehicle width direction at a position corresponding to the lower part of the bulging portion.

6. The absorber has an upper surface facing upwards towards the vehicle, and side walls extending downwards from both ends of the upper surface in the vehicle width direction. The vehicle rear structure according to claim 2, claim 4, or claim 5, characterized in that the upper surface has a convex portion that protrudes upward from the upper end of the side wall and extends in the longitudinal direction of the vehicle.

7. The rear vehicle structure according to any one of claims 2, 4 to 6, characterized in that the absorber is hollow and columnar, and a notch is provided on the rear end surface of the absorber.

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