Vehicle rear structure

Abstract

To protect a protective component, which is disposed on a floor panel, from an impact load derived from a rear collision.SOLUTION: A vehicle rear structure includes: a protective component 11 disposed on an upper side of a floor panel 10; and a support frame 20 that supports the floor panel 10 from below. The support frame 20 includes: a forward frame 21; and a rearward frame 22 extending rearward from a rear part of the forward frame 21 and being joined to a tail end panel 13. A lower part of the rearward frame 22 has a slope part 23 that inclines downward as proceeding rearward. A lower end of the slope part 23 is located below the forward frame 21. An intermediate joint part 26 joined with the forward frame 21 and rearward frame 22, is located behind the protective component 11.SELECTED DRAWING: Figure 4

Description

[Technical Field]

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

[0002] There are known vehicles that have a storage compartment for a spare tire in the lower rear of the vehicle, as disclosed in Patent Document 1, for example. The spare tire storage compartment in this example has a support structure for supporting the spare tire. The support structure includes a cross member that is disposed below the storage compartment and extends in the vehicle width direction, and a rear collision response frame that extends from the center of the cross member toward the rear of the vehicle and is provided with a towing hook.

[0003] In this example, when a collision load is input to the rear of the vehicle, the rear collision frame is deformed to cause the spare tire to bounce up, thereby absorbing the impact that would occur if the spare tire were to move forward in a rear collision. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Japanese Patent Application Laid-Open No. 2017-87977 Summary of the Invention [Problem to be solved by the invention]

[0005] However, in the above-described structure, if the spare tire is thrown up due to deformation of the reinforcing member (rear-end collision frame), there is a possibility that the load placed above the spare tire may be damaged. Also, if the spare tire is placed below the load attached to the vehicle's drive source (vehicle parts such as a battery device or a tank filled with CNG (Compressed Natural Gas)), there is a possibility that the vehicle parts attached to the drive source may be damaged.

[0006] Therefore, in terms of protecting vehicle parts loaded (placed) above the floor panel from the impact load during a rear-end collision, the structure of the above example leaves room for improvement.

[0007] The present invention has been made to solve the above-mentioned problems, and its purpose is to provide a vehicle rear structure that can protect protective components installed on the upper side of the floor panel from impact loads caused by rear-end collisions, etc. [Means for solving the problem]

[0008] The present invention provides a vehicle rear structure for achieving the above object, which includes a floor panel constituting a vehicle body floor portion, a pair of side members provided on both vehicle widthwise outer sides of the floor panel and extending in the fore-and-aft direction of the vehicle, and a tail end panel joined to the rear ends of the side members and extending in the vehicle width direction. The vehicle rear structure includes a protective component arranged above the floor panel, and a support frame arranged below the floor panel and supporting the floor panel, the support frame having a front frame extending in the fore-and-aft direction of the vehicle, and a rear frame extending from a rear portion of the front frame toward the rear of the vehicle and joined to the tail end panel, a sloped portion inclined downward toward the rear of the vehicle is provided at a lower portion of the rear frame, the lower end of the sloped portion being located below the front frame, and an intermediate joint where the front frame and the rear frame are joined is located rearward of the protective component. Side panels are provided on both sides of the rear frame and spaced apart from each other, and lower portions of the side panels extend along the inclination direction of the inclined portion and are joined to the side portions of the inclined portion, and upper portions of the side panels are joined to the floor panel. are. [Effects of the Invention]

[0009] According to the present invention, a protective component installed on the upper side of a floor panel can be protected from an impact load due to a rear collision or the like. [Brief explanation of the drawings]

[0010] [Figure 1] 1 is a bottom view of an embodiment of a vehicle rear structure according to the present invention. [Figure 2] 2 is an enlarged bottom view showing the support frame and its surroundings in a state where the spare tire in FIG. 1 has been removed. FIG. [Figure 3] 3 is a cross-sectional view taken along the line AA in FIG. 2, showing the intermediate joint portion. [Figure 4] 3 is a side view of the support frame of FIG. 2 as seen from the outer side in the vehicle width direction. [Figure 5] FIG. 2 is a plan view of the support frame of FIG. 1 as seen from above the vehicle, with the floor panel omitted. [Figure 6] 3 is a side view schematically showing a state in which the support frame and floor panel of FIG. 2 are deformed during a rear-end collision. FIG. DETAILED DESCRIPTION OF THE INVENTION

[0011] Hereinafter, one embodiment of a vehicle undercarriage structure for a vehicle according to the present invention will be described with reference to the drawings (FIGS. 1 to 6). In the drawings, the direction of arrow Fr indicates the front in the longitudinal direction of the vehicle. In the description of the embodiment, the "front (front end) and rear (rear end)" correspond to the front and rear in the longitudinal direction of the vehicle. Furthermore, arrows R and L indicate the right and left sides when an occupant looks forward of the vehicle. Furthermore, arrow D indicates the lower side of the vehicle, and arrow U indicates the upper side of the vehicle.

[0012] As shown in Fig. 1, the vehicle rear structure of this embodiment includes a floor panel 10 that constitutes the vehicle body floor and is made of a metal material. A battery device 11 is installed on the vehicle upper side of the floor panel 10. The battery device 11 is one of the components that constitute the vehicle, and is a protective component that must be protected from impact loads that occur due to side collisions, rear collisions, etc.

[0013] Furthermore, the vehicle rear structure of this embodiment has a tail end panel 13 disposed at the rear of the vehicle body, a pair of side members 12 disposed on both vehicle widthwise outer sides of the floor panel 10 and extending in the front-to-rear direction of the vehicle, a rear cross member 15, an intermediate cross member 16, and a support frame 20. A rear bumper (not shown) extending in the vehicle width direction is disposed on the vehicle rear side of the tail end panel 13. The vehicle rear structure of this embodiment also has a tire mounting portion 30 for accommodating a spare tire 35. The structure of each member will be described below.

[0014] As shown in FIG. 1 , the tail end panel 13 is a panel member made of, for example, metal, provided at the rear of the floor panel 10 and extending in the vehicle width direction. A front wall surface 13a extending in the vehicle width direction and facing the front of the vehicle is provided at the lower part of the tail end panel 13. The floor panel 10 and a rear cross member 15 are joined to the front wall surface 13a. The side member 12 is a highly rigid member that constitutes the body frame and is made of a metal material. As shown in FIGS. 1 and 2 , the side member 12 is provided on the outer side of the floor panel 10 in the vehicle width direction and extends in the front-to-rear direction of the vehicle. The rear of the side member 12 is joined to the tail end panel 13.

[0015] The rear cross member 15 is a member disposed at the rear of the vehicle body, and is a highly rigid member that constitutes the vehicle body frame, similar to the side members 12. The rear cross member 15 of this embodiment is joined to the inner sides of the side members 12, the rear of the floor panel 10, and the front wall surface 13a of the tail end panel 13, and contributes to improving the rigidity of the rear of the vehicle body.

[0016] A flange (not shown) extending in the vehicle width direction is provided at the lower rear portion of the rear cross member 15, and this flange is joined by spot welding to the front wall surface 13a of the tail end panel 13. Also, as shown in FIG. 2, an upper flange 15a extending in the vehicle width direction is provided at the upper front portion of the rear cross member 15, and this upper flange 15a is joined by spot welding to the underside of the floor panel 10. Also, an outer flange 15b extending in the vehicle fore-and-aft direction is provided at the lower portion of the outer portion of the rear cross member 15 in the vehicle width direction, and this outer flange 15b is joined to the inner portion of the side member 12 by spot welding.

[0017] The intermediate cross member 16, like the rear cross member 15, is a metal member that extends in the vehicle width direction and is a highly rigid member that constitutes the vehicle body frame. As shown in Figures 1 and 2, the intermediate cross member 16 is disposed on the front side of the vehicle with a gap between them and the rear cross member 15. A front flange 16a and a rear flange 16b are provided on the upper part of the front and rear portions of the intermediate cross member 16, respectively, and these flanges 16a, 16b are joined to the underside of the floor panel 10 by spot welding.

[0018] Next, the tire mounting portion 30 will be described. As shown in Fig. 1, the tire mounting portion 30 in this embodiment is provided on the vehicle lower side of the floor panel 10. In this example, the tire mounting portion 30 is disposed on the vehicle lower side of the intermediate cross member 16. A spare tire 35 is mounted in a horizontal position on the underside of the floor panel 10 via the tire mounting portion 30.

[0019] The tire mounting portion 30 has a support member 31 and an auxiliary member 32. The support member 31 is U-shaped in a top view, opening toward the front of the vehicle, and the front ends of the U-shape on both sides in the vehicle width direction are curved upward toward the vehicle and are rotatably connected to restricting members 33 joined to the vehicle body. The rear end of the U-shape is curved upward toward the vehicle so as to support the rear portion of the spare tire 35.

[0020] The auxiliary member 32 is joined to the intermediate portion of the support member 31 in the vehicle front-rear direction, and is a member extending in the vehicle width direction, with both sides in the vehicle width direction curved upward of the vehicle so as to support the sides of the spare tire 35. The restricting member 33 is a member arranged on the vehicle front side of the spare tire 35 with a gap therebetween, and extends in the vehicle width direction. The end of the restricting member 33 in the vehicle width direction is attached to a brace 18 joined to the body frame. Here, the body frame includes the side members 12 and the cross member 19 arranged on the vehicle front side of the intermediate cross member 16 with a gap therebetween.

[0021] As the support member 31 rotates, the rear portion of the support member 31 moves downwards on the vehicle, and the spare tire 35 is placed on the support member 31 and the auxiliary member 32. After that, the rear portion of the support member 31 is moved upwards on the vehicle and engaged with the underside of the vehicle body, thereby attaching the spare tire 35. While supported by the support member 31 and the auxiliary member 32, the spare tire 35 can rotate so that the rear portion of the spare tire 35 moves downwards on the vehicle.

[0022] Next, the support frame 20 will be described. As shown in FIGS. 1 and 2, the support frame 20 is a member that is disposed below the floor panel 10 and supports the floor panel 10, and is formed from a metal material. In this example, the support frame 20 is disposed between the spare tire 35 and the muffler. That is, the support frame 20 in this embodiment is disposed offset to the right with respect to the center of the vehicle body in the vehicle width direction. Therefore, in this embodiment, there is a high degree of freedom in the layout of the support frame 20.

[0023] 2 and 4, the support frame 20 has a front frame 21 extending in the front-to-rear direction of the vehicle, and a rear frame 22 extending from the rear of the front frame 21 toward the rear of the vehicle and joined to the tail end panel 13. In addition, an inclined panel (inclined portion) 23 that forms an inclined portion that slopes downward toward the rear of the vehicle is provided at the lower part of the rear frame 22, and the lower end of the inclined panel 23 is located below the front frame 21. Furthermore, the support frame 20 has an intermediate joint 26 that joins the front frame 21 and the rear frame 22, and the intermediate joint 26 is located rearward of the battery device 11, which serves as a protective component.

[0024] By providing the support frame 20, impact loads due to a rear-end collision or the like are transmitted from the tail end panel 13 along the inclined panel (inclined portion) 23 to the highly rigid intermediate joint 26. Because the inclined panel 23 of the rear frame 22 is connected to the intermediate joint 26 at an incline as described above, stress concentration is promoted at the intermediate joint 26. As a result, during a rear-end collision, the support frame 20 deforms such that the portions of the floor panel 10 corresponding to the front and rear sides of the intermediate joint 26 deform in the vehicle vertical direction as shown by the dashed lines, as shown in FIG. 6 . In other words, the portions in front of and behind the highly rigid intermediate joint 26 deform in the vehicle vertical direction.

[0025] At this time, because the intermediate joint 26 is located further rearward of the vehicle than the battery device 11, the portion of the floor panel 10 that deforms upward can be located behind the battery device 11, thereby suppressing damage to the battery device 11 that would otherwise be caused by deformation of the floor panel 10. Furthermore, if the rear frame 22 is located further downward in the vehicle, the inclination becomes steeper, making it easier for deformation to occur at the intermediate joint 26. Therefore, according to this embodiment, protective components such as the battery device 11 that are installed above the floor panel 10 can be protected from impact loads due to rear-end collisions, etc.

[0026] The components of the vehicle rear structure having the support frame 20 will be described below. First, the front frame 21 will be described. The front frame 21 is a metal member extending in the fore-and-aft direction and has a hat-shaped cross section that opens toward the top of the vehicle. As shown in FIGS. 2 and 4, upper flanges 21d extending in the fore-and-aft direction of the vehicle are provided on the upper portions of both side walls (ends in the vehicle width direction) of the front frame 21, and the upper flanges 21d are joined to the underside of the floor panel 10 by spot welding. The rear of the front frame 21 is joined to the rear frame 22 by intermediate joints 26.

[0027] Furthermore, the front portion of the front frame 21 has side flanges 21e and a lower flange 21b that are joined to the intermediate cross member 16. The side flanges 21e are formed so as to widen outward from the center of the front frame 21 in the vehicle width direction as they extend from the front portions of the side walls 21c of the front frame 21 toward the front of the vehicle. The lower flange 21b extends from the front portion of the underside of the front frame 21 toward the front of the vehicle and is formed so as to widen in the vehicle width direction. The outer lower portions of the side flanges 21e are connected to the lower flange 21b. The outer ends of the lower flanges 21b are positioned outward of the side walls 21c of the front frame 21.

[0028] The side flanges 21e are joined by spot welding to the rear wall portion of the intermediate cross member 16, and the lower flange 21b is joined by spot welding to the underside of the intermediate cross member 16. The side flanges 21e and the lower flange 21b are formed so as to expand in the width direction.

[0029] Next, the rear frame 22 will be described. The rear frame 22 is a metal member extending in the front-rear direction, and has an inclined panel 23 that forms an inclined portion, and two side panels 24. As shown in FIGS. 2 and 4, the inclined panel 23 is a member that forms the lower surface (bottom surface) of the rear frame 22. That is, the inclined panel 23 is inclined downward from the rear portion of the lower surface of the front frame 21 toward the rear of the vehicle. The inclined panel 23 also has a peak 25 on the vehicle rear side. The peak 25 is inclined upward from the rear end of the inclined panel 23 toward the rear of the vehicle. The inclination of the peak 25 is gentler than the inclination direction of the inclined panel 23.

[0030] A towing hook 40 is attached to the inclined panel 23, and a front portion of the towing hook 40 extends along the inclination direction of the inclined panel 23 and is joined to the inclined panel 23. As shown in FIG. 4 , the towing hook 40 in this example extends downwardly along the rear end of the rear frame 22, bends forwardly, extends forwardly, bends in the inclination direction of the inclined panel 23, and extends along the inclined panel 23. The towing hook 40 is joined to the rear end of the rear frame 22 by arc welding, and the portion extending along the inclined panel 23 is joined to the inclined panel 23 by arc welding. The portion of the towing hook 40 that extends forwardly is disposed below the top portion 25 with a gap therebetween.

[0031] Next, the side panels 24 will be described. As shown in FIGS. 2 and 4 , the side panels 24 extend upward from both side portions of the inclined panel 23 and are spaced apart from each other. The front portions of the side panels 24 are joined to the front frame 21. The lower portions of the side panels 24 extend obliquely along the oblique direction of the inclined panel 23 and are joined to the side portions of the inclined panel 23. The side panels 24 on both sides open in the width direction relative to the center of the width direction of the rear frame 22 as they extend upward from the vehicle. The front portions of the upper portions of the side panels 24 are joined to the floor panel 10, the rear portions of the upper portions of the side panels 24 are joined to the rear cross member 15, and the rear ends of the side panels 24 are joined to the front wall portion of the tail end panel 13.

[0032] 4, a step portion 24a is formed in the upper portion of the side panel 24 to correspond to the shape of the rear cross member 15. A front flange (upper joint portion) 24b is formed in front of the step portion 24a of the side panel 24, and the front flange 24b is joined to the floor panel 10 by spot welding. In addition, a rear flange (upper joint portion) 24c is formed behind the step portion 24a, and the rear flange 24c is joined to the underside of the rear cross member 15 by spot welding.

[0033] 2, the spacing between the front flanges 24b in the vehicle width direction is set to increase toward the rear of the vehicle. Similarly, the spacing between the rear flanges 24c in the vehicle width direction is set to increase toward the rear of the vehicle. In other words, the front flanges 24b and the rear flanges 24c are inclined outward from the center of the rear frame 22 toward the rear of the vehicle.

[0034] In this embodiment, the lower portion of the side panel 24 extends along the inclination direction of the inclined panel 23 and is joined to the inclined panel 23, so the joint portion, which provides high rigidity, is formed to extend in the vehicle longitudinal direction. In addition, the side portion of the inclined panel 23 overlaps with the side panel 24 when viewed from below, making it shorter in the width direction, which facilitates the transmission of load along the vehicle longitudinal direction. As a result, load transmission is promoted, and vertical deformation at the intermediate joint portion 26 is facilitated.

[0035] In addition, in this embodiment, the front portions of the side panels 24 are joined to the rear portions of the front frame 21, so that the rigidity of the intermediate joint 26 is improved and the shape of the support frame 20 is deformed.

[0036] Here, the intermediate joint 26 will be described. The intermediate joint 26 is the portion where the rear portion of the front frame 21 and the front portion of the rear frame 22 (the inclined panel 23 and both side panels 24) are joined. The intermediate joint 26 includes a portion where the rear portion of the underside of the front frame 21 and the front portion of the inclined panel 23 of the rear frame 22 are spot-welded in an overlapping state. As shown in FIGS. 2 and 3, the intermediate joint 26 also includes a portion where the rear portion of the upper flange 21d of the side wall 21c of the front frame 21 and the front portion of the front flange 24b of the rear frame 22 are joined in an overlapping state. This portion is also joined to the floor panel 10, and may be joined in a three-layer configuration.

[0037] Furthermore, the intermediate joint 26 includes a portion where the rear portion of the side wall 21c of the front frame 21 and the front portion of the side panel 24 are joined in an overlapping state. Also, since the intermediate joint 26 is sufficient as long as it joins the front frame 21 and the rear frame 22, the front portion of the inclined panel 23 may be joined to the side panel 24 and the rear portion of the front frame 21 in a triplet. Because multiple panels are joined in an overlapping manner at the intermediate joint 26, the rigidity of the intermediate joint 26 is improved, and as a result, the front and rear of the intermediate joint 26 in the support frame 20 are more likely to deform up and down.

[0038] In addition, in this embodiment, the towing hook 40 is joined to the inclined panel 23 along the inclination direction of the inclined panel 23, so that the impact load input to the towing hook 40 is effectively transmitted from the inclined panel 23 to the front frame 21. Furthermore, because the rear frame 22 is wider in the width direction when viewed downward, even if a load including a component in the vehicle width direction is input, the load is more likely to be supported by the floor panel 10, so widthwise deformation of the rear frame 22 is suppressed and vertical deformation is promoted at positions in front of and behind the intermediate joint 26.

[0039] Furthermore, in this embodiment, as described above, the rear cross member 15 is joined to the rear of the tail end panel 13 and the floor panel 10, and the rear of the rear frame 22 is joined to the rear cross member 15, so that the shape of the rear frame 22 can be maintained when an impact load due to a rear-end collision is input. Also, a rotational deformation can be generated around the longitudinal direction (vehicle width direction) of the rear cross member 15. This deformation makes it easier to transmit the impact load along the inclined portion of the rear frame 22, making it possible to cause vertical deformation of the floor panel 10 at a desired position.

[0040] In this embodiment, as shown in FIG. 5, an intermediate frame 27 is joined to the top surface (upper side) of the floor panel 10. The intermediate frame 27 is a metal plate-shaped member extending in the vehicle longitudinal direction, and also functions to reinforce the floor portion. The intermediate frame 27 is disposed in a position corresponding to the support frame 20. That is, the intermediate frame 27 and the support frame 20 sandwich the floor panel 10 and are joined to the floor panel 10. As shown in FIGS. 3 and 5, a flange 27b extending in the vehicle longitudinal direction is provided on the side of the intermediate frame 27, and the flange 27b is joined to the top surface of the floor panel 10 by spot welding. In this example, the intermediate frame 27 has a recess 27a in the center that is recessed downward and extends in the vehicle longitudinal direction.

[0041] Further, a notch (weak portion) 27d is provided on the side of the intermediate frame 27. In this example, the notch 27d is cut out from each of the flanges 27b on both sides of the intermediate frame 27 toward the center in the width direction of the intermediate frame 27. The notch 27d, which weakens the strength, is positioned so as to overlap the intermediate joint portion 26 of the support frame 20 in a plan view.

[0042] By providing notch 27d, which serves as a weakened portion, in intermediate frame 27, it is possible to control the stress concentrated on floor panel 10 and direct the deformation of floor panel 10 to the intended position. Furthermore, by arranging intermediate joint 26 and notch 27d to overlap in a plan view, deformation of support frame 20 is more likely to occur starting from intermediate joint 26, promoting deformation of floor panel 10 at this position and suppressing damage to battery device 11. As a result, it is possible to contribute to preventing failure of battery device 11.

[0043] In this embodiment, the battery device 11, which is a protective component, is disposed on top of the intermediate cross member 16, and a side flange 21e and a lower flange 21b joined to the intermediate cross member 16 are formed on both sides of the front portion of the front frame 21 so as to extend in the width direction. This allows a load from the rear of the vehicle to be transmitted to the intermediate cross member 16, effectively dispersing the load and suppressing deformation of the front frame 21. As a result, deformation at the intermediate joint 26 is promoted when an impact load due to a rear-end collision is received.

[0044] The description of the present embodiment is merely an example for explaining the present invention, and does not limit the invention 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.

[0045] In this embodiment, the protective component is the battery device 11, but is not limited to this. For example, it may be a tank filled with CNG. [Explanation of symbols]

[0046] 10 Floor Panel 11 Battery device (protective parts) 12 Side member 13 Tail end panel 13a Front wall 15 Rear cross member 15a Upper flange 15b Outer flange 16 Intermediate cross member 16a Front flange 16b Rear flange 18 braces 19 Cross member 20 Support Frame 21 Front Frame 21a Bottom side 21b Lower flange 21c side wall 21d Upper flange 21e Side flange 22 Rear frame 23 Inclined panel (inclined section) 24 Side Panel 24a Step 24b Front flange (upper joint) 24c Rear flange (upper joint) 25 Top 26 Intermediate joint 27 Intermediate Frame 27a Recess 27b flange 27d Notch (weak part) 30 Tire mounting part 31 Support material 32 Auxiliary parts 33 Regulatory components 35 spare tire 40 Tow hook

Claims

1. A vehicle rear structure having a floor panel constituting a vehicle body floor portion, a pair of side members provided on both vehicle widthwise outer sides of the floor panel and extending in the vehicle front-rear direction, and a tail end panel joined to rear ends of the side members and extending in the vehicle width direction, a battery device disposed above the floor panel; a support frame disposed below the floor panel and supporting the floor panel, the support frame includes a front frame extending in the vehicle longitudinal direction, and a rear frame extending from a rear portion of the front frame toward the rear of the vehicle and joined to the tail end panel, a lower portion of the rear frame is provided with an inclined portion that inclines downward toward the rear of the vehicle, and a lower end of the inclined portion is located below the front frame; an intermediate joint portion where the front frame and the rear frame are joined is disposed rearward of the vehicle relative to the battery device; Side panels are provided on both sides of the rear frame and spaced apart from each other; A vehicle rear structure, characterized in that a lower portion of the side panel extends along the inclination direction of the inclined portion and is joined to a side portion of the inclined portion, and an upper portion of the side panel is joined to the floor panel.

2. A vehicle rear structure having a floor panel constituting a vehicle body floor portion, a pair of side members provided on both outer sides of the floor panel in the vehicle width direction and extending in the vehicle fore-and-aft direction, and a tail end panel joined to the rear ends of the side members and extending in the vehicle width direction, a battery device disposed above the floor panel; a support frame disposed below the floor panel and supporting the floor panel, the support frame includes a front frame extending in the vehicle longitudinal direction, and a rear frame extending from a rear portion of the front frame toward the rear of the vehicle and joined to the tail end panel, a lower portion of the rear frame is provided with an inclined portion that inclines downward toward the rear of the vehicle, and a lower end of the inclined portion is located below the front frame; an intermediate joint portion where the front frame and the rear frame are joined is disposed rearward of the vehicle relative to the battery device; A vehicle rear structure characterized in that upper joints that are joined to the floor panel are provided at the upper parts of both sides of the rear frame, and the vehicle width direction spacing of the upper joints on both sides is set to increase toward the rear of the vehicle.

3. A vehicle rear structure having a floor panel constituting a vehicle body floor portion, a pair of side members provided on both outer sides of the floor panel in the vehicle width direction and extending in the vehicle fore-and-aft direction, and a tail end panel joined to the rear ends of the side members and extending in the vehicle width direction, a battery device disposed above the floor panel; a support frame disposed below the floor panel and supporting the floor panel, the support frame includes a front frame extending in the vehicle longitudinal direction, and a rear frame extending from a rear portion of the front frame toward the rear of the vehicle and joined to the tail end panel, a lower portion of the rear frame is provided with an inclined portion that inclines downward toward the rear of the vehicle, and a lower end of the inclined portion is located below the front frame; an intermediate joint portion where the front frame and the rear frame are joined is disposed rearward of the vehicle relative to the battery device; A rear cross member extending in the vehicle width direction is provided in front of the tail end panel and below the floor panel, A vehicle rear structure, characterized in that the rear frame is joined to the rear cross member.

4. A vehicle rear structure having a floor panel constituting a vehicle body floor portion, a pair of side members provided on both outer sides of the floor panel in the vehicle width direction and extending in the vehicle fore-and-aft direction, and a tail end panel joined to the rear ends of the side members and extending in the vehicle width direction, a battery device disposed above the floor panel; a support frame disposed below the floor panel and supporting the floor panel, the support frame includes a front frame extending in the vehicle longitudinal direction, and a rear frame extending from a rear portion of the front frame toward the rear of the vehicle and joined to the tail end panel, a lower portion of the rear frame is provided with an inclined portion that inclines downward toward the rear of the vehicle, and a lower end of the inclined portion is located below the front frame; an intermediate joint portion where the front frame and the rear frame are joined is disposed rearward of the vehicle relative to the battery device; An intermediate frame having a weak portion is joined to the upper side of the floor panel, The vehicle rear structure, characterized in that the weak portion is arranged so as to overlap the intermediate joint portion in a plan view.

5. 2. The vehicle rear structure according to claim 1, wherein the front portions of the side panels are joined to the front frame.

6. 6. The vehicle rear structure according to claim 1, wherein a front portion of the side panel is joined to the intermediate joint portion.

7. upper joint portions are provided at upper portions on both sides of the rear frame to be joined to the floor panel, and the distance between the upper joint portions on both sides in the vehicle width direction is set to increase toward the rear of the vehicle, 7. The vehicle rear structure according to claim 1, claim 5, or claim 6, wherein a towing hook is attached to the inclined portion, and a front portion of the towing hook extends along the inclination direction of the inclined portion and is joined to the inclined portion.

8. An intermediate cross member is provided below the floor panel and the battery device, and extends in the vehicle width direction so as to connect the side members on both sides in the vehicle width direction, 8. A vehicle rear structure as claimed in any one of claims 1 to 7, characterized in that a joint portion that is joined to the intermediate cross member is provided at the front portion of the front frame, and the joint portion is provided on both sides of the front frame and is formed so as to extend in the width direction.

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