Vehicle body frame structure

Abstract

The left and right rear end pillars (20) stand on both sides of the vehicle width direction of the rear end of the vehicle where the side frame structure (14) and the rear surface frame structure (15) intersect, and extend in the up-down direction. The opening lower edge frame (41) extends in the vehicle width direction above the rear end cross beam (13) of the vehicle body frame (2) in a manner defining the lower edge of the rear surface opening (9), connects the left and right rear end pillars (20), and forms the rear surface frame structure (15). The first transverse frame (43) extends in the vehicle width direction in front of the vehicle of the opening lower edge frame (41), and connects the left and right side frame structures (14). The left and right front and rear connecting frames (45) are arranged separately in the vehicle width direction, extend in the vehicle front-rear direction, and connect the opening lower edge frame (41) and the first transverse frame (43).

Description

Technical Field

[0001] The present disclosure relates to a vehicle body frame structure. Background Art

[0002] Patent Document 1 shows a bus rear body structure in which a plurality of cross beams are fixed to a rear surface member of the bus as a frame material. The plurality of cross beams are arranged vertically and separated at different height positions and extend substantially horizontally in the vehicle width direction.

[0003] Prior art literature

[0004] Patent Literature

[0005] Patent Document 1: Japanese Patent Application Laid-Open No. 10-250382 Summary of the invention

[0006] Technical problem to be solved by the invention

[0007] When large vehicle-mounted components (such as a driving battery) are mounted from the rear of the vehicle and arranged at the rear of a bus (vehicle), a rear opening with a large vertical width needs to be provided on the rear surface of the vehicle body as an operating space.

[0008] However, in order to provide the rear surface opening having a large vertical width in the structure of Patent Document 1, it is necessary to arrange the cross member with a larger vertical interval. The increase in the vertical interval of the cross member leads to a decrease in the rigidity of the rear surface of the vehicle body.

[0009] Therefore, an object of the present disclosure is to provide a vehicle body frame structure that can ensure the rigidity of the rear surface of the vehicle body and expand the rear surface opening.

[0010] Technical means for solving technical problems

[0011] In order to achieve the above-mentioned purpose, the first scheme of the present disclosure is a vehicle body frame structure: the side surface of the vehicle body is composed of left and right side frame structures, and the rear surface of the vehicle body is composed of a rear surface frame structure. In the vehicle body frame structure, the rear ends of the left and right side beams extending in the front-rear direction of the vehicle on both sides of the vehicle width direction are supported from below by a vehicle body frame, and the vehicle body frame is connected by a rear end cross beam extending in the vehicle width direction. The vehicle body frame structure includes: left and right rear end pillars, an opening lower edge frame, a first cross frame, and left and right front-rear connection frames.

[0012] The left and right rear end pillars stand up on both sides of the rear end of the vehicle in the vehicle width direction where the side frame structure and the rear surface frame structure intersect, and extend in the up-down direction. The opening lower edge frame extends in the vehicle width direction above the rear end cross beam in a manner defining the lower edge of the rear surface opening, connects the left and right rear end pillars, and constitutes the rear surface frame structure. The first transverse frame extends in the vehicle width direction in front of the vehicle of the opening lower edge frame, and connects the left and right side frame structures. The left and right front and rear connection frames are arranged separately in the vehicle width direction, extend in the vehicle front-rear direction, and connect the opening lower edge frame to the first transverse frame.

[0013] In the first scheme, during the driving of the vehicle, the load input from the axle of the rear wheel to the rear surface side of the vehicle body via the vehicle body frame is transmitted from the lower edge frame of the opening to the left and right side frame structures via the left and right front and rear connecting frames and the first transverse frame. In this way, the load input to the rear surface side of the vehicle body can be dispersed to the left and right side frame structures via the left and right front and rear connecting frames and the first transverse frame to support it, so that the rigidity reduction of the rear surface of the vehicle body caused by expanding the upper and lower width of the rear surface opening (providing a larger space above the lower edge frame of the opening) can be reliably suppressed by the left and right front and rear connecting frames and the first transverse frame. Therefore, the rigidity of the rear surface of the vehicle body can be ensured, and the rear surface opening can be expanded.

[0014] A second aspect of the present disclosure is the vehicle body frame structure of the first aspect, including one or more second transverse frames extending above the first transverse frame in the vehicle width direction and connecting the left and right side frame structures.

[0015] In the second embodiment, the left and right side frame structures are connected by the second transverse frame, so that the load input to one side frame structure can be transmitted to the other side frame structure via the second transverse frame, and the overall rigidity of the rear part of the vehicle body can be improved. Therefore, the reduction in the rigidity of the rear surface of the vehicle body caused by the expansion of the rear surface opening can be further reliably suppressed.

[0016] The third aspect of the present disclosure is the vehicle body frame structure of the second aspect, wherein the side frame structure has left and right center pillars that stand at substantially the same vehicle front-rear position as the first transverse frame. The second transverse frame connects the left and right center pillars.

[0017] In the third embodiment, the left and right center pillars erected at substantially the same vehicle front and rear positions as the first transverse frame are connected by the second transverse frame, thereby effectively improving the rigidity of the entire rear vehicle body against the load input from the first transverse frame to the left and right side frame structures.

[0018] A fourth aspect of the present disclosure is the vehicle body frame structure of the first to third aspects, wherein vehicle-mounted components are mounted on the left and right front-rear connecting frames.

[0019] In the fourth aspect, the load input from the vehicle-mounted component can be distributed to the rear surface frame structure and the left and right side frame structures to support them, so that even when the vehicle-mounted component is a heavy object, the supporting rigidity of the vehicle-mounted component can be ensured.

[0020] A fifth aspect of the present disclosure is the vehicle body frame structure of the second or third aspect, wherein vehicle-mounted components are placed on the left and right front-rear connecting frames, and the placed vehicle-mounted components are fixed to the second transverse frame.

[0021] In the fifth aspect, the load input from the vehicle-mounted component can be distributed to the rear surface frame structure and the left and right side frame structures to support them, so that even when the vehicle-mounted component is a heavy object, the supporting rigidity of the vehicle-mounted component can be ensured.

[0022] Since the vehicle-mounted component is fixed to the second transverse frame, the supporting state of the vehicle-mounted component can be stabilized.

[0023] A sixth aspect of the present disclosure is the vehicle body frame structure of the first to fifth aspects, comprising one or more upper and lower connecting members. The upper and lower connecting members are arranged between the rear end cross member and the open lower edge frame to connect the rear end cross member and the open lower edge frame.

[0024] In the sixth aspect, the opening lower edge frame and the rear end cross member are connected by the upper and lower connecting members, so the rigidity of the rear surface of the vehicle body can be further improved.

[0025] The sixth scheme of the present disclosure is a vehicle body frame structure of the first to sixth schemes, and the rear surface opening is defined by the following components: an opening lower edge frame, which extends in the vehicle width direction at a position lower than the center of the upper and lower heights of the rear surface of the vehicle body; left and right rear end pillars; and a rear end panel of the ceiling surface frame structure, which constitutes the vehicle body ceiling surface.

[0026] The seventh aspect of the present disclosure is the vehicle body frame structure of the sixth aspect, wherein the rear end panel extends in the vehicle width direction, and both ends thereof in the vehicle width direction are fixed and supported by upper ends of left and right rear end pillars and an upper end of a first rear pillar.

[0027] Effects of the Invention

[0028] According to the present disclosure, it is possible to ensure the rigidity of the rear surface of the vehicle body and to enlarge the rear surface opening. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 This is a perspective view of the vehicle body framework structure according to the present embodiment as viewed from an oblique rear side.

[0030] Figure 2 Observed from the front Figure 1 A three-dimensional diagram of the body frame structure.

[0031] Figure 3 Observed from the outside in the vehicle width direction Figure 1 Side view of the body frame structure.

[0032] Figure 4 Observed from behind the vehicle Figure 1 Rear view of the body frame structure.

[0033] Figure 5 Observed from above Figure 1 A top view of the vehicle body frame structure.

[0034] Figure 6 yes Figure 2 Enlarged view of the main part. DETAILED DESCRIPTION

[0035] Hereinafter, an embodiment of the present invention will be described based on the accompanying drawings. In the following description, the left-right direction means the left-right direction in the state of facing the front of the vehicle. In addition, the arrow FR in the figure indicates the front of the vehicle, UP indicates the upper side, and IN indicates the inner side in the vehicle width direction.

[0036] like Figure 1 to Figure 5 As shown in the figure, the vehicle 1 of the present disclosure is a bus having a body frame structure 3 supported from below by a body frame 2, and a battery storage room (vehicle component storage room) 5 is provided at the rear of the vehicle in a passenger compartment 4. A battery unit 6 (see FIG. 1 ) as a vehicle component for supplying power to a driving motor (not shown) is mounted in the battery storage room 5. Figure 3 to Figure 5 ). The battery unit 6 of this embodiment is composed of two batteries 7 and a battery support frame 8, and the two batteries 7 are arranged to overlap each other, and the battery support frame 8 connects the upper and lower batteries 7 and integrates them. A rear surface opening 9 is provided on the rear surface of the vehicle body, and the rear surface opening 9 opens the battery storage chamber 5 to the rear of the vehicle. The rear surface opening 9 is formed to have a large left-right width and a large vertical width so as to effectively function as an operating space when a heavy object, that is, a large battery unit 6, is loaded and arranged from the rear of the vehicle.

[0037] The vehicle body frame 2 is composed of a pair of left and right side beams 10 extending in the vehicle front-rear direction on both sides in the vehicle width direction, and a plurality of cross beams 11 extending in the vehicle width direction and connecting the left and right side beams 10. The side beam 10 of this embodiment is a split type side beam divided into a plurality of parts in the vehicle front-rear direction, and has left and right rear side beams 12 extending in the front-rear direction at the rear end of the vehicle 1. The plurality of cross beams 11 include a rear end cross beam 13 connecting the rear end portions of the left and right rear side beams 12. Alternatively, the left and right side beams 10 may be a non-split type (integral type) continuous over the entire length of the vehicle.

[0038] The left and right sides of the vehicle 1 are respectively formed by the side frame structure 14, the rear surface of the vehicle body is formed by the rear surface frame structure 15, and the vehicle body roof surface is formed by the roof surface frame structure 16. The so-called frame structure refers to a structure formed by crossing and connecting a plurality of frame materials. The cross-sectional shape of the frame materials constituting the vehicle body frame structure 3 (in addition to the frame materials of the vehicle body side, the rear surface of the vehicle body and the vehicle body roof surface, it also includes the first transverse frame 43, the second transverse frame 44 and the front and rear connecting frame 45 described later) can be set to any shape such as "U" shape or rectangular tube shape according to the required strength.

[0039] The left and right side frame structures 14 include a plurality of columns 17, a plurality of side frames 18, and a plurality of side connecting frames 26, 27, 28 as frame materials. The plurality of columns 17 include a rear end column 20, a first rear column 21, and a second rear column (middle column) 22. The plurality of side frames 18 include a lower side frame 23, an intermediate side frame 24, and an upper side frame 25.

[0040] The left and right rear pillars 20 stand on both sides of the vehicle width direction of the rear end of the vehicle where the side frame structure 14 and the rear surface frame structure 15 intersect and extend in the up-down direction, and the lower end of the rear pillar 20 is fixed to the vehicle body frame 2. The first rear pillar 21 extends in the up-down direction in front of the rear pillar 20, and the second rear pillar 22 extends in the up-down direction in front of the first rear pillar 21. The rear pillar 20 and the first rear pillar 21 are connected by a side connection frame (side first transverse connection frame 26) extending in the front-back direction. Similarly, the first rear pillar 21 and the second rear pillar 22 are connected by a side connection frame (side second transverse connection frame 27) extending in the front-back direction.

[0041] The lower side frame 23 extends in the front-to-rear direction above the vehicle body frame 2, and the rear end of the lower side frame 23 is fixed to the rear end pillar 20. The front end of the lower side frame 23 is fixed to the side connecting frame (the longitudinal frame 28 above the wheel house), which extends in the up-down direction above the vehicle body frame 2. The middle side frame 24 extends in the front-to-rear direction above the lower side frame 23, and the rear side of the middle side frame 24 is connected to the lower side frame 23 by the lower part of the first rear pillar 21 and the longitudinal frame 28 above the wheel house. The longitudinal frame 28 above the wheel house is arranged at a vehicle front-to-rear position that is substantially the same as the second rear pillar 22 (refer to Figure 3 and Figure 6 The upper side frame 25 extends in the front-rear direction above the intermediate side frame 24 , and the upper end portions of the first rear pillar 21 and the second rear pillar 22 are fixed to the upper side frame 25 .

[0042] An arch-shaped rear fender 30 is fixed below the lower frame 23 to define the upper side of the wheel housing 29. The wheel housing 29 houses a tire 31 of the rear wheel (see FIG. Figure 3), the vehicle body frame 2 is supported on the axle (omitted in the figure) of the rear wheel via a suspension (omitted in the figure). A reinforcing member 32 is fixed to the upper surface of the rear end cross beam 13 behind the rear fender 30, and the reinforcing member 32 reinforces the rear side of the wheel cover 29.

[0043] The ceiling surface frame structure 16 includes a beam-shaped rear end panel 33, a plurality of ceiling beams 34, and a plurality of ceiling surface connection frames 35 as frame materials. The plurality of ceiling beams 34 include a first ceiling beam 36 and a second ceiling beam 37. The beam-shaped rear end panel 33 extends in the vehicle width direction, and both ends of the beam-shaped rear end panel 33 in the vehicle width direction are fixed and supported by the upper end of the rear pillar 20 and the upper end of the first rear pillar 21. The first ceiling beam 36 extends in the vehicle width direction in a state of being fixed to the front surface of the beam-shaped rear end panel 33 in an overlapping manner, and the other ceiling beams 34 (including the second ceiling beam 37) extend in the vehicle width direction in front of the first ceiling beam 36 while being separated from each other in the front-rear direction. Both ends of the other ceiling beams 34 in the vehicle width direction are fixed and supported by the upper side frame 25. The ceiling surface connection frame 35 extends in the vehicle front-rear direction and connects the ceiling beams 34 separated from each other in the front-rear direction.

[0044] The rear surface skeleton structure 15 includes the left and right rear end pillars 20, the beam-shaped rear end panel 33, the left and right rear end frames 40, the opening lower edge frame 41, and a plurality of (in this embodiment, a pair of left and right) upper and lower connection frames 42 as frame materials. The left and right rear end frames 40 stand up from the upper surfaces of the two end portions of the rear end cross beam 13 in the vehicle width direction and extend upward, and the lower ends of the rear end frames 40 are fixed to the rear end cross beam 13. The lower portions of the left and right rear end pillars 20 are fixed to the left and right rear end frames 40, respectively.

[0045] The opening lower edge frame 41 extends in the vehicle width direction above the rear end cross member 13 and below the center of the vertical height of the vehicle body rear surface so as to define the lower edge of the rear surface opening 9, and connects the left and right rear end pillars 20. The vehicle width direction ends of the opening lower edge frame 41 are placed and fixed on the upper ends of the rear end frames 40, and are fixed to the rear end pillars 20. The left and right upper and lower connecting frames 42 extend in the vertical direction between the opening lower edge frame 41 and the reinforcement member 32, and the upper and lower ends of the upper and lower connecting frames 42 are respectively fixed to the opening lower edge frame 41 and the reinforcement member 32. That is, the upper and lower connecting frames 42 and the reinforcement member 32 are arranged between the rear end cross member 13 and the opening lower edge frame 41, and constitute the upper and lower connecting members connecting the rear end cross member 13 and the opening lower edge frame 41. The vehicle width direction positions of the left and right upper and lower connecting frames 42 are set to be substantially the same as the vehicle width direction positions of the left and right front and rear connecting frames 45 described later.

[0046] In the present embodiment, the upper edge of the rear surface opening 9 is defined by the beam-shaped rear end panel 33, and the side edges of the rear surface opening 9 in the vehicle width direction are defined by the left and right rear end pillars 20. However, the upper edge and side edges of the rear surface opening 9 may be defined by other members. For example, an opening upper edge frame may be provided to define the upper edge of the rear surface opening 9, and the opening upper edge frame extends in the vehicle width direction below the beam-shaped rear end panel 33 and connects the left and right rear end pillars 20. In addition, left and right opening side edge frames may be provided to define the left and right side edges of the rear surface opening 9, and the left and right opening side edge frames extend in the up-down direction inside the left and right rear end pillars 20 in the vehicle width direction and connect the opening lower edge frame 41 and the beam-shaped rear end panel 33.

[0047] The vehicle body frame structure 3 includes a first transverse frame 43, a second transverse frame 44 disposed above and below, and a front-rear connecting frame 45 disposed on the left and right sides as frame materials. The first transverse frame 43 extends in the vehicle width direction in front of the vehicle of the opening lower edge frame 41, and connects the left and right side frame structures 14. In the present embodiment, both ends of the first transverse frame 43 in the vehicle width direction are fixed to the inner side surfaces of the left and right wheel house upper longitudinal frames 28 in the vehicle width direction. The wheel house upper longitudinal frames 28 are disposed at substantially the same vehicle front-rear position as the second rear pillar 22, so the second rear pillar 22 stands at substantially the same vehicle front-rear position as the first transverse frame 43. The first transverse frame 43 is disposed at a height position between the lower side frame 23 and the middle side frame 24.

[0048] The upper and lower second transverse frames 44 extend in the vehicle width direction above the first transverse frame 43 in a vertically separated manner and connect the left and right side frame structures 14. A partition wall (not shown) is fixed to the upper and lower second transverse frames 44 for partitioning the vehicle compartment 4 and the battery storage chamber 5. In the present embodiment, both ends of the second transverse frame 44 in the vehicle width direction may be fixed to the inner side surfaces of the left and right second rear pillars 22 in the vehicle width direction. The number of the second transverse frames 44 is not limited to two, and may be one or three or more.

[0049] The left and right front and rear connecting frames 45 are arranged separately in the vehicle width direction, extend in the vehicle front and rear direction, and connect the opening lower edge frame 41 and the first transverse frame 43. In the present embodiment, the front end of the front and rear connecting frame 45 is fixed to the vehicle rear surface of the first transverse frame 43, and the rear end of the front and rear connecting frame 45 is placed and fixed on the upper surface of the opening lower edge frame 41.

[0050] A battery support member 46 is fixed to the vehicle rear surface of the second transverse frame 44, and the battery support member 46 supports the battery unit 6 from the front. The battery unit 6 is placed and fixed to the left and right front and rear connection frames 45. In addition, the vehicle front portion of the battery unit 6 is fixed to the second transverse frame 44 via the battery support member 46.

[0051] According to the present embodiment, the load inputted from the axle of the rear wheel to the rear surface side of the vehicle body through the vehicle body frame 2 during the travel of the vehicle 1 is transmitted from the opening lower edge frame 41 to the left and right side frame structures 14 through the left and right front and rear connecting frames 45 and the first transverse frame 43. In this way, the load inputted to the rear surface side of the vehicle body can be dispersed to the left and right side frame structures 14 through the left and right front and rear connecting frames 45 and the first transverse frame 43 to support it, so that the rigidity reduction of the rear surface of the vehicle body caused by the expansion of the upper and lower width of the rear surface opening 9 (providing a large space above the opening lower edge frame 41) can be reliably suppressed by the left and right front and rear connecting frames 45 and the first transverse frame 43. Therefore, the rigidity of the rear surface of the vehicle body can be ensured and the rear surface opening 9 can be expanded.

[0052] Since the left and right side frame structures 14 are connected by the second transverse frame 44, the load input to one side frame structure 14 can be transmitted to the other side frame structure 14 via the second transverse frame 44, and the rigidity of the entire rear portion of the vehicle body can be improved. Therefore, the reduction in the rigidity of the rear surface of the vehicle body caused by the expansion of the rear surface opening 9 can be further reliably suppressed.

[0053] Since the left and right second rear pillars 22 standing at substantially the same vehicle front and rear positions as the first cross frame 43 are connected by the second cross frame 44 , the rigidity of the entire vehicle rear portion against the load input from the first cross frame 43 to the left and right side frame structures 14 can be effectively improved.

[0054] Since the load input from the battery unit 6 can be distributed to the rear surface frame structure 15 and the left and right side frame structures to support them, the supporting rigidity of the battery unit 6, which is a heavy object, can be ensured.

[0055] Since the front portion of the battery unit 6 is fixed to the second lateral frame 44 , the supporting state of the battery unit 6 can be stabilized.

[0056] Furthermore, since the opening lower edge frame 41 and the rear end cross member 13 are connected by the upper and lower connection frames 42 and the reinforcement member 32 , the rigidity of the rear surface of the vehicle body can be further improved.

[0057] Although the present invention has been described above based on the above-mentioned embodiments, the present invention is not limited to the contents of the above-mentioned embodiments and can be appropriately changed without departing from the scope of the present invention. That is, other embodiments, examples, and application technologies etc. completed by those skilled in the art based on the present embodiment are of course all included in the scope of the present invention.

[0058] For example, in the above embodiment, the battery unit 6 is described as an example of a vehicle-mounted component, but a vehicle-mounted component other than the battery unit 6 may be mounted. In addition, the number of the front and rear connection frames 45 is not limited to two, and may be three or more.

[0059] This application is based on Japanese patent application (Japanese Patent Application No. 2020-130872) filed on July 31, 2020, and the contents are incorporated herein by reference.

[0060] Industrial Availability

[0061] The present invention can be applied to a vehicle having a vehicle body frame structure.

[0062] Description of Reference Numerals

[0063] 1: Vehicle

[0064] 2: Body frame

[0065] 3: Body frame structure

[0066] 4: Carriage

[0067] 5: Battery Containment Room

[0068] 6: Battery unit (on-board component)

[0069] 9: Rear surface opening

[0070] 10: Side beam

[0071] 11: Beam

[0072] 12: Rear side beam

[0073] 13: Rear end beam

[0074] 14: Side skeleton structure

[0075] 15: Back surface skeleton structure

[0076] 16: Ceiling frame structure

[0077] 20: Rear column

[0078] 21: 1st back post

[0079] 22: 2nd rear pillar (middle pillar)

[0080] 23: Lower side frame

[0081] 24: Middle side frame

[0082] 25: Upper side frame

[0083] 29: Wheel cover

[0084] 30: Rear fender

[0085] 31: Tires

[0086] 32: Strengthening member (upper and lower connecting members)

[0087] 40: Frames at both ends of the rear surface

[0088] 41: Opening lower edge frame

[0089] 42: Upper and lower connecting frames (upper and lower connecting members)

[0090] 43: 1st horizontal frame

[0091] 44: 2nd horizontal frame

[0092] 45: Front and rear connection frame

Claims

1. A vehicle body frame structure, in which the rear ends of left and right side beams extending in the front-rear direction of the vehicle on both sides in the vehicle width direction are supported from below by a vehicle body frame, the vehicle body frame is connected by a rear end cross beam extending in the vehicle width direction, the vehicle body side surface is composed of left and right side frame structures, and the vehicle body rear surface is composed of a rear surface frame structure; The vehicle body frame structure is characterized by comprising: The left and right rear end pillars are erected on both sides in the vehicle width direction of the rear end of the vehicle where the side frame structure and the rear surface frame structure intersect, and extend in the up-down direction. an opening lower edge frame, which extends in the vehicle width direction above the rear end cross beam in a manner defining the lower edge of the rear surface opening, and connects the left and right rear end pillars to form the rear surface skeleton structure, a first transverse frame extending in the vehicle width direction at the front of the vehicle of the opening lower edge frame and connecting the left and right side frame structures; and The left and right front-rear connection frames are arranged in a spaced-apart manner in the vehicle width direction, extend in the vehicle front-rear direction, and connect the opening lower edge frame and the first transverse frame.

2. The vehicle body frame structure according to claim 1, characterized in that: The vehicle body frame structure includes one or more second transverse frames, and the one or more second transverse frames extend above the first transverse frame in the vehicle width direction and connect the left and right side frame structures.

3. The vehicle body frame structure according to claim 2, characterized in that: The side frame structure has left and right intermediate pillars, and the left and right intermediate pillars stand at substantially the same vehicle front and rear positions as the first transverse frame; The second transverse frame connects the left and right intermediate pillars.

4. The vehicle body frame structure according to any one of claims 1 to 3, characterized in that: Vehicle-mounted components are placed on the left and right front-rear connecting frames.

5. The vehicle body frame structure according to claim 2 or 3, characterized in that: On the left and right front and rear connecting frames are mounted vehicle-mounted components; The mounted vehicle-mounted component is fixed to the second transverse frame.

6. The vehicle body frame structure according to any one of claims 1 to 3, characterized in that: The vehicle body frame structure includes one or more upper and lower connecting members, which are arranged between the rear end cross beam and the open lower edge frame and connect the rear end cross beam and the open lower edge frame.

7. The vehicle body frame structure according to any one of claims 1 to 3, characterized in that: The rear surface opening is defined by: The opening lower edge frame extends in the vehicle width direction at a position lower than the center of the vertical height of the rear surface of the vehicle body. The left and right rear end columns, and The rear end panel of the roof surface frame structure, which constitutes the vehicle body roof surface.

8. The vehicle body frame structure according to claim 7, characterized in that: The rear end panel extends in the vehicle width direction, and both ends thereof in the vehicle width direction are fixed and supported by upper ends of the left and right rear end pillars and an upper end of the first rear pillar.

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