Lower vehicle body structure of vehicle

Abstract

To suppress a collision load from being transmitted to a battery at the time of side collision.SOLUTION: A lower vehicle body structure of a vehicle comprises an outer reinforcement 30 fixed to an outer wall part 13 of a side sill 2, and an inner reinforcement 40 having a vertical surface part 43 fixed to an inner upper wall part 21 and an inner wall part 23 of the side sill 2. A cross member 60 extending in a vehicle width direction is fixed to the inner upper wall part 21 of the side sill 2. The outer reinforcement 30 has an overlapping part (a connection surface part 33) whose position in a vertical direction overlaps with the inner reinforcement 40. The vertical surface part 43 has a load transmission prompting part whose position in a vehicle longitudinal direction overlaps with the cross member 60 and which transits a collision load to the cross member 60 at the time of side collision.SELECTED DRAWING: Figure 2

Description

Technical Field

[0001] The technology disclosed herein belongs to the technical field related to the lower body structure of a vehicle.

Background Art

[0002] In the case of hybrid vehicles and electric vehicles, generally, a battery is disposed below a floor panel. In such vehicles, a vehicle body structure for absorbing collision energy so that a collision load during a side impact is not transmitted to the battery has been studied.

[0003] Patent Document 1 discloses a side sill component including a first profile component that is relatively located outside in the vehicle width direction and has a first destructibility, and a second profile component that is relatively located inside in the vehicle width direction and has a second destructibility lower than the first destructibility. In Patent Document 1, during a side impact, the first profile member and the second profile member are crushed to absorb collision energy.

Prior Art Documents

Patent Documents

[0004]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0005] However, in the configuration of Patent Document 1, there is a possibility that a collision load that cannot be completely absorbed by the crushing of the first profile member is transmitted to the battery via the second profile member without crushing the second profile member. Therefore, there is room for improvement from the viewpoint of suppressing the transmission of the collision load to the battery.

[0006] The technology disclosed herein has been made in view of such a point, and its object is to suppress the transmission of a collision load during a side collision to a battery.

Means for Solving the Problems

[0007] To solve the above problems, a first aspect of the technology disclosed herein targets the lower vehicle body structure of a vehicle and includes a pair of left and right side sills having a closed cross-section structure extending in the vehicle longitudinal direction, a floor panel fixed to the side sills and constituting the floor surface of the passenger compartment, a battery disposed below the floor panel, and a cross member extending in the vehicle width direction and having both end portions in the vehicle width direction fixed to the side sills above the floor panel. The side sill has an outer wall portion which is a wall surface located on the outer side in the vehicle width direction and extending in the vertical direction and the vehicle longitudinal direction, an inner wall portion which is a wall surface located on the inner side in the vehicle width direction and extending in the vertical direction and the vehicle longitudinal direction, an upper wall portion extending in the vehicle width direction from the upper end portions of the outer wall portion and the inner wall portion, a lower wall portion extending in the vehicle width direction from the lower end portions of the outer wall portion and the inner wall portion, an outer reinforcement fixed to the outer wall portion inside the closed cross-section structure, and an inner reinforcement fixed to the upper wall portion and the inner wall portion inside the closed cross-section structure. The cross member is fixed to the upper wall portion. The outer reinforcement has an overlapping portion which is located on the inner side in the vehicle width direction compared with other portions of the outer reinforcement and has an overlapping vertical position with the inner reinforcement. The inner reinforcement is fixed to the upper wall portion and the inner wall portion and has a longitudinal surface portion extending in the vertical direction and the vehicle width direction. The longitudinal surface portion has an overlapping position in the vehicle longitudinal direction with the cross member and has a load transmission promoting portion for transmitting a collision load input through the overlapping portion to the cross member during a side collision.

[0008] In the first aspect, when the outer wall portion is displaced inward in the vehicle width direction by a side impact, the overlapping portion of the outer reinforcement abuts against the inner reinforcement. The inner reinforcement has a vertical surface portion fixed to the upper wall portion and the inner wall portion of the side sill. Since the vertical surface portion has a load transmission promoting portion, the load transmitted from the outer reinforcement to the inner reinforcement is transmitted inward and upward in the vehicle width direction via the load transmission promoting portion. Since a cross member is fixed above the battery at a portion inside the side sill in the vehicle width direction, the impact load is transmitted from the inner reinforcement to the cross member. As a result, the transmission of the impact load to the battery disposed below the floor panel is suppressed.

[0009] The second aspect is that, in the first aspect, the end portion on the outer side in the vehicle width direction of the load transmission promoting portion overlaps with the overlapping portion in the vertical direction, and the end portion on the inner side in the vehicle width direction of the load transmission promoting portion overlaps with the cross member in the vertical direction.

[0010] In the second aspect, the impact load is efficiently transmitted from the outer reinforcement to the cross member via the load transmission promoting portion. Thereby, it is possible to suppress the impact load at the time of a side impact from being transmitted to the battery.

[0011] The third aspect is that, in the second aspect, the center in the vertical direction of the vertical surface portion is located above the center in the vertical direction of the overlapping portion and below the center in the vertical direction of the cross member.

[0012] In the third aspect, the impact load is efficiently transmitted from a position outside and below in the vehicle width direction to a position inside and above in the vehicle width direction via the load transmission promoting portion.

[0013] Further, even when the overlapping portion of the outer reinforcement contacts the inner reinforcement and the vertical surface portion rotates and displaces due to the collision load, the vertical surface portion rotates and displaces inward and upward in the vehicle width direction toward the cross member. For this reason, the transmission path of the collision load from the outer reinforcement to the cross member is likely to be maintained.

[0014] Therefore, it is possible to suppress the transmission of the collision load during a side collision to the battery.

[0015] The fourth aspect is that, in the third aspect, the load transmission promoting portion is a portion having higher rigidity than other portions of the vertical surface portion.

[0016] In the fourth aspect, the load transmission promoting portion is more likely to transmit the collision load compared to other portions of the vertical surface portion. Thereby, the collision load is efficiently transmitted from the outer reinforcement to the cross member via the load transmission promoting portion, so that it is possible to suppress the transmission of the collision load during a side collision to the battery.

[0017] The fifth aspect is that, in the fourth aspect, the load transmission promoting portion is a bead portion that continuously extends from the end portion on the outer side in the vehicle width direction to the end portion on the inner side in the vehicle width direction.

[0018] In the fifth aspect, the load transmission promoting portion can be easily configured.

[0019] The sixth aspect is that, in the first aspect, the overlapping portion has a surface that extends in the vehicle front-rear direction and the vertical direction, and the position in the vehicle front-rear direction overlaps with the cross member.

[0020] In the sixth aspect, since the overlapping portion contacts the vertical surface portion in as wide a range as possible, the collision load can be dispersed and input to the vertical surface portion. By dispersing the collision load and inputting it to the vertical surface portion, crushing of the vertical surface portion can be suppressed as much as possible. On the other hand, even if the collision load is dispersed and input to the vertical surface portion, the collision load is efficiently transmitted toward the cross member by the load transmission promoting portion. Further, since the positions of the overlapping portion and the cross member overlap in the vehicle front-rear direction, the transmission path of the collision load can be made as short as possible. Thereby, it is possible to suppress the collision load at the time of side collision from being transmitted to the battery.

[0021] The seventh aspect is, in the sixth aspect, the outer reinforcement includes an upper surface portion extending outward in the vehicle width direction from the upper end of the overlapping portion toward the outer wall portion, and a lower surface portion extending outward in the vehicle width direction from the lower end of the overlapping portion toward the outer wall portion.

[0022] In the seventh aspect, a closed cross-section can be formed by the outer wall portion and the outer reinforcement, and the rigidity of the outer reinforcement is improved. Thereby, the collision load can be efficiently transmitted from the outer reinforcement to the vertical surface portion, and it is possible to suppress the collision load at the time of side collision from being transmitted to the battery.

[0023] The eighth aspect is, in the sixth aspect, the battery is supported by a portion inside the vehicle width direction of the overlapping portion in the lower wall portion, and the lower end of the overlapping portion is located above the lower wall portion.

[0024] In the eighth aspect, the collision load is less likely to be directly transmitted from the overlapping portion to the battery. Thereby, it is possible to suppress the collision load at the time of side collision from being transmitted to the battery.

[0025] Aspect 9 is the aspect 8, wherein the inner reinforcement has a horizontal surface portion that overlaps with the region where the battery is disposed in the vehicle longitudinal direction, extends in the vehicle longitudinal direction and the vehicle width direction, and is fixed to the inner side wall portion, and the horizontal surface portion is located between the lower wall portion and the vertical surface portion in the vertical direction.

[0026] In aspect 9, when the overlapping portion of the outer reinforcement abuts against the inner reinforcement, even if the vertical surface portion rotates and displaces due to the collision load, the horizontal surface portion can suppress the vertical surface portion from displacing downward. Thereby, it is possible to suppress the collision load from being directly transmitted to the support portion of the battery.

[0027] Aspect 10 is the aspect 9, wherein the vertical surface portion is fixed to the horizontal surface portion.

[0028] In aspect 10, even if the side collision position is a position other than the position of the vertical surface portion, the collision load is transmitted to the vertical surface portion via the horizontal surface portion. Thereby, the collision load is efficiently transmitted from the outer reinforcement to the cross member via the horizontal surface portion and the vertical surface portion. As a result, it is possible to suppress the collision load at the time of side collision from being transmitted to the battery.

Advantages of the Invention

[0029] As described above, according to the technology disclosed herein, it is possible to suppress the collision load at the time of side collision from being transmitted to the battery.

Brief Description of the Drawings

[0030]

Figure 1

Figure 2

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Figure 14

BEST MODE FOR CARRYING OUT THE INVENTION

[0031] Hereinafter, exemplary embodiments will be described in detail with reference to the drawings. In the following description, the front, rear, left, right, up, and down of the vehicle 1 are simply referred to as front, rear, left, right, up, and down, respectively. The left-right direction corresponds to the vehicle width direction.

[0032] (Overall Configuration of Lower Vehicle Body) FIG. 1 shows the lower body of a vehicle 1 to which the body structure according to the present embodiment is applied. The vehicle 1 is a four-door passenger car. In the present embodiment, the body structure of the vehicle 1 is configured symmetrically about the left and right.

[0033] The vehicle 1 includes a pair of left and right side sills 2. Each side sill 2 extends straight in the front-rear direction. As will be described in detail later, each side sill 2 has a closed cross-sectional structure, and the closed cross-section extends straight in the front-rear direction.

[0034] The vehicle 1 includes a floor panel 3 that constitutes the floor surface of the passenger compartment. A pair of left and right floor panels 3 are provided. Each floor panel 3 has a floor panel main body 3a (see FIG. 2 etc.) that extends in the vehicle width direction and the front-rear direction, and a floor panel joint portion 3b (see FIG. 2 etc.) that is fixed to the side sill 2 by welding. The floor panel joint portion 3b of the left floor panel 3 is provided at the left end portion and is fixed to the right side portion of the left side sill 2 by welding. The floor panel joint portion 3b of the right floor panel 3 is provided at the right end portion and is fixed to the left side portion of the right side sill 2 by welding. The right end portion of the left floor panel 3 and the left end portion of the right floor panel 3 are connected by a tunnel panel 4.

[0035] At the rear end of the floor panel 3, a kick-up portion 5 that rises upward is arranged. From the kick-up portion 5, a rear floor panel 6 extends toward the rear side. The rear floor panel 6 mainly constitutes the floor surface of the luggage compartment. A pair of left and right rear wheel houses 7 are arranged on both the left and right sides of the rear floor panel 6.

[0036] Above the floor panel 3, two cross members 60 extending along the left-right direction are arranged. The two cross members 60 are arranged side by side in the front-rear direction. The front-rear position of the rear cross member 60 is the same as the front-rear position of the center pillar 9 (see FIG. 2 etc.).

[0037] The cross member 60 has a cross member main body 61 and brackets 62. The brackets 62 are respectively fixed to both sides in the left - right direction of the cross member main body 61. The brackets 62 are fixed to the cross member main body 61. The left bracket 62 is fixed to the left side sill 2 by welding, and the right bracket 62 is fixed to the right side sill 2 by welding. Thereby, the left - right ends of the cross member 60 are fixed to the side sill 2. The lower end of the cross member main body 61 is fixed to the upper surface of the floor panel 3 and the upper surface of the tunnel panel 4.

[0038] A pair of left - right floor frames 8 are arranged in front of the front cross member 60. The floor frames 8 extend in the front - rear direction.

[0039] As shown in FIG. 2, a battery B is arranged below the floor panel 3. The battery B is arranged below the floor panel 3 in a state of being housed in a battery case 70.

[0040] The battery B is supported by the lower wall portion (inner lower wall portion 22, described later) of the side sill 2 together with the battery case 70 via a support portion 80. Specifically, a bracket 71 extending outward in the vehicle width direction is fixed to the outer portion in the vehicle width direction of the battery case 70 (the right - hand portion in FIG. 2). A hole 71a through which a bolt 81 is inserted is formed at the outer end in the vehicle width direction of the bracket 71 (the right - hand end in FIG. 2). The bolt 81 is coupled to a nut 82 fixed to a portion within the closed cross - section of the lower wall portion of the side sill 2. The bolt 81 is inserted into the hole 71a of the bracket 71 from below and fixed to the nut 82. Thereby, the battery B is supported by the side sill 2 via the battery case 70 and the bracket 71. The bolt 81 and the nut 82 constitute the support portion 80. A bush 72 is arranged around the bolt 81 between the bracket 71 and the inner lower wall portion 22. The bush 72 is composed of an elastic member. Although not shown, the central portion in the vehicle width direction of each battery case 70 is attached to and supported by the tunnel panel 4.

[0041] (Configuration of the Side Sill) Hereinafter, the configuration of the side sill 2 will be described in detail. As described above, since the body structure of the vehicle 1 is symmetric about the left and right, hereinafter, the configuration of the right side sill 2 will be described in detail, and the detailed description of the left side sill 2 will be omitted. Further, in the description of the right side sill 2, the right side corresponds to the outer side in the vehicle width direction, and the left side corresponds to the inner side in the vehicle width direction.

[0042] 〈Outer Panel, Inner Panel〉 As shown in FIG. 2, the side sill 2 has an outer panel 10 located relatively on the right side and an inner panel 20 located relatively on the left side.

[0043] The outer panel 10 has a hat-shaped cross-sectional shape that opens to the left. The outer panel 10 includes an outer upper wall portion 11 that extends in the left-right direction and the front-rear direction, an outer lower wall portion 12 that is located below the outer upper wall portion 11 and faces the outer upper wall portion 11 in the vertical direction and extends in the left-right direction and the front-rear direction, and an outer side wall portion 13 that vertically connects the right end portion of the outer upper wall portion 11 and the right end portion of the outer lower wall portion 12 and extends in the vertical direction and the front-rear direction. An outer flange 14 extends in the vertical direction from the left end portion of the outer upper wall portion 11 and the left end portion of the outer lower wall portion 12. The outer upper wall portion 11 is inclined downward toward the right side. The outer lower wall portion 12 is inclined upward toward the right side.

[0044] At the position of the center pillar 9 in the front-rear direction, the lower end portion of the center pillar 9 is located on the right side of the outer panel 10. The lower end portion of the center pillar 9 is fixed to the outer panel 10 by welding.

[0045] The inner panel 20 has a hat-shaped cross-sectional shape that opens to the right. An inner upper wall portion 21 that extends in the left-right direction and the front-rear direction, an inner lower wall portion 22 that is located below the inner upper wall portion 21 and faces the inner upper wall portion 21 in the up-down direction and extends in the left-right direction and the front-rear direction, and an inner side wall portion 23 that connects the left end portion of the inner upper wall portion 21 and the left end portion of the inner lower wall portion 22 in the up-down direction and extends in the up-down direction and the front-rear direction. An inner flange 24 extends in the up-down direction from the right end portion of the inner upper wall portion 21 and the right end portion of the inner lower wall portion 22. The inner upper wall portion 21 slopes downward toward the left. The inner lower wall portion 22 extends straight in the left-right direction. The inner lower wall portion 22 has a hole 22a through which a bolt 81 is inserted.

[0046] The outer panel 10 and the inner panel 20 are in a state where their openings face each other in the left-right direction, and the outer flange 14 and the inner flange 24 are overlapped in the left-right direction. The outer flange 14 and the inner flange 24 are joined by welding. As a result, the side sill 2 has a rectangular closed cross-sectional structure composed of an outer upper wall portion 11, an outer lower wall portion 12, an outer side wall portion 13, an inner upper wall portion 21, an inner lower wall portion 22, and an inner side wall portion 23.

[0047] The floor panel 3 and the cross member 60 are fixed to the inner panel 20. Specifically, as shown in FIG. 2, the floor panel joint portion 3b of the floor panel 3 is formed by bending the right end portion of the floor panel main body 3a upward, extends along the inner wall portion 23, and is joined to the left side surface of the inner wall portion 23. The bracket 62 of the cross member 60 is disposed so as to cover the corner portion between the inner upper wall portion 21 and the inner wall portion 23. The bracket 62 has a welding margin 63 that continuously extends along the inner upper wall portion 21 and the inner wall portion 23. The portion of the welding margin 63 along the inner upper wall portion 21 is joined to the inner upper wall portion 21. The portion of the welding margin 63 along the inner wall portion 23 is overlapped with the right end portion of the floor panel 3 in the left-right direction and is joined to the inner wall portion 23 via the floor panel 3. Note that FIG. 2 shows the fixing structure of the rear cross member 60 and the inner panel 20. The structure of the front cross member 60 and the inner panel 20 is the same as the fixing structure of the rear cross member 60 and the inner panel 20.

[0048] 〈Outer Reinforcement〉 Inside the closed cross-section structure of the side sill 2, an outer reinforcement 30 is fixed to the outer panel 10. The outer reinforcement 30 is formed by bending a single plate. The material strength of the outer reinforcement 30 is lower than the material strength of the cross member main body 61. The material strength here means the strength of the plate itself that constitutes the member. The material strength is a parameter determined by, for example, the tensile strength and thickness of the plate. The higher the tensile strength, the higher the material strength, and the larger the thickness, the higher the material strength.

[0049] The outer reinforcement 30 has a hat-shaped cross-sectional shape that opens to the right. The outer reinforcement 30 includes an upper surface portion 31 that extends in the left-right direction and the front-rear direction, a lower surface portion 32 that is located below the upper surface portion 31, faces the upper surface portion 31, and extends in the left-right direction and the front-rear direction, and a connecting surface portion 33 that vertically connects the left end portion of the upper surface portion 31 and the left end portion of the lower surface portion 32 and extends in the vertical direction and the front-rear direction. Further, the outer reinforcement 30 includes an upper flange 34 that extends upward along the outer wall portion 13 from the right end portion of the upper surface portion 31 and is fixed to the outer wall portion 13 by welding, and a lower flange 35 that extends downward along the outer wall portion 13 from the right end portion of the lower surface portion 32 and is fixed to the outer wall portion 13 by welding. By fixing the upper flange 34 and the lower flange 35 to the outer wall portion 13, the outer wall portion 13, the upper surface portion 31, the lower surface portion 32, and the connecting surface portion 33 form a rectangular closed cross-section.

[0050] The upper surface portion 31 is inclined upward from the upper end portion of the connecting surface portion 33 toward the right. The lower surface portion 32 is inclined downward from the lower end portion of the connecting surface portion 33 toward the left. The connecting surface portion 33 is a vertical surface that extends straight in the vertical direction and the front-rear direction. The upper surface portion 31 is located at the same position as the floor panel body 3a in the vertical direction. The connecting surface portion 33 is spaced apart from the outer wall portion 13 in the left-right direction and is located on the left side of the other portions of the outer reinforcement 30. The lower end of the connecting surface portion 33 is located above the outer lower wall portion 12 and the inner lower wall portion 22. The lower end of the connecting surface portion 33 is located above the tip of the bolt 81 of the support portion 80. The connecting surface portion 33 corresponds to an overlapping portion where the vertical positions overlap with the inner reinforcement 40 described later.

[0051] As shown in FIG. 3, the outer reinforcement 30 extends straight in the front-rear direction. The front end of the outer reinforcement 30 is in front of the front cross member 60, and the rear end of the outer reinforcement 30 is behind the rear cross member 60. That is, the outer reinforcement 30 overlaps with the cross member 60 in the front-rear direction. Further, the outer reinforcement 30 overlaps with the region where the battery B is disposed in the front-rear direction.

[0052] As shown in FIG. 4, the corner between the bottom surface portion 32 and the lower flange 35 has a deformation promoting portion 36. The deformation promoting portion 36 is for facilitating the displacement of the bottom surface portion 32 upward around the corner portion. The deformation promoting portion 36 is a bead that protrudes toward the left and lower sides of the corner portion. The bottom surface of the deformation promoting portion 36 is in an inclined surface shape connecting the right end portion of the bottom surface portion 32 and the upper end portion of the lower flange 35. The corner between the upper surface portion 31 and the upper flange 34 is not provided with the deformation promoting portion as described above. The deformation promoting portion 36 overlaps with the lateral surface portion 44 of the second inner reinforcement 42, which will be described later, in the front-rear direction. Note that the bottom surface of the deformation promoting portion 36 may be a curved surface having a curvature radius larger than the curvature radius of the portion other than the deformation promoting portion 36 at the corner portion. Further, the deformation promoting portion 36 may be formed by cutting out a part of the corner between the bottom surface portion 32 and the lower flange 35.

[0053] 〈Inner Reinforcement〉 In the closed cross section of the side sill 2, an inner reinforcement 40 is fixed to the inner panel 20. As shown in FIG. 3, the inner reinforcement 40 overlaps with the outer reinforcement 30 in the front-rear direction. That is, the connecting surface portion 33 of the outer reinforcement 30 overlaps with the inner reinforcement 40 in the front-rear direction. The inner reinforcement 40 includes a first inner reinforcement 41 and a second inner reinforcement 42.

[0054] As shown in FIG. 4, the first inner reinforcement 41 is composed of a single plate. The material strength of the first inner reinforcement 41 is lower than the material strength of the outer reinforcement 30.

[0055] As shown in FIGS. 4 and 5, the first inner reinforcement 41 has a U-shaped cross-sectional shape that opens upward. The first inner reinforcement 41 includes a horizontal surface portion 41a that extends in the left-right direction and the front-rear direction, an inner bent portion 41b that is bent upward from the left end portion of the horizontal surface portion 41a and extends in the vertical direction and the front-rear direction, and an outer bent portion 41c that is bent upward from the right end portion of the horizontal surface portion 41a and extends in the vertical direction and the front-rear direction.

[0056] As shown in FIG. 4, the horizontal surface portion 41a is located above the inner lower wall portion 22 and is vertically spaced apart from the inner lower wall portion 22. The horizontal surface portion 41a is located above the tip of the bolt 81. The horizontal surface portion 41a is located below the second inner reinforcement 42. That is, the horizontal surface portion 41a is located between the inner lower wall portion 22 and the second inner reinforcement 42 in the vertical direction. The horizontal surface portion 41a is located below the lower end of the connecting surface portion 33. The horizontal surface portion 41a overlaps with the region where the battery B is provided in the front-rear direction.

[0057] The vertical length of the inner bent portion 41b is longer than the vertical length of the outer bent portion 41c. The inner bent portion 41b overlaps with the connecting surface portion 33 in the vertical direction. The inner bent portion 41b is fixed to the right side surface of the inner wall portion 23 by welding. Thereby, the horizontal surface portion 41a is fixed to the inner wall portion 23.

[0058] As shown in FIG. 5, the outer bent portion 41c has a plurality (five in FIG. 5) of protruding portions 41d that protrude upward. The protruding portions 41d are spaced apart from each other in the front-rear direction. The upper end portions of the protruding portions 41d are located below the upper end portion of the inner bent portion 41b. As shown in FIG. 4, the protruding portions 41d overlap the connecting surface portion 33 in the vertical direction. As shown in FIG. 2, portions other than the protruding portions 41d of the outer bent portion 41c are located below the connecting surface portion 33.

[0059] As shown in FIG. 3, a plurality (five here) of second inner reinforcements 42 are provided. The second inner reinforcements 42 are arranged spaced apart in the front-rear direction. Corresponding to the positions of the second inner reinforcements 42, the protruding portions 41d of the first inner reinforcement 41 are arranged. One of the second inner reinforcements 42 overlaps the front cross member 60 in the front-rear direction. Another one of the second inner reinforcements 42 overlaps the rear cross member 60 in the front-rear direction. The second inner reinforcements 42 overlap the connecting surface portion 33 in the front-rear direction.

[0060] As shown in FIG. 6, the second inner reinforcement 42 is composed of a single plate. The material strength of the second inner reinforcement 42 is the same as that of the first inner reinforcement 41 and lower than the material strength of the outer reinforcement 30.

[0061] The second inner reinforcement 42 has a pair of vertical surfaces 43 that face each other in the front-rear direction and extend in the vertical and left-right directions, and a horizontal surface 44 that extends in the front-rear and vertical directions so as to connect the right end portions of the pair of vertical surfaces 43. The horizontal surface 44 is provided at the center of the right end portion of the vertical surface 43. At the right end portion of the vertical surface 43, the horizontal surface 44 is not connected to the upper and lower end portions. The distance in the front-rear direction between the pair of vertical surfaces 43 is smaller than the width in the front-rear direction of the cross member 60. In the second inner reinforcement 42 where the position in the front-rear direction overlaps with the cross member 60, both of the pair of vertical surfaces 43 overlap with the cross member 60 in the position in the vehicle front-rear direction.

[0062] As shown in FIG. 4, the vertical surface 43 has a rectangular shape. The vertical surface 43 overlaps with the connecting surface 33 in the vertical direction. The vertical center C2 of the vertical surface 43 is located above the vertical center C1 of the connecting surface 33. The vertical center C2 of the vertical surface 43 is located below the vertical center C3 of the cross member 60.

[0063] The vertical surface 43 has a bead 43a that extends obliquely upward from the right side to the left side. As shown in FIGS. 2 and 4, the right end portion of the bead 43a overlaps with the connecting surface 33 of the outer reinforcement 30 in the vertical direction. The left end portion of the bead 43a is located above the floor panel 3 and overlaps with the cross member 60 in the vertical direction. The left end portion of the bead 43a is located below the vertical center C3 of the cross member 60. The portion of the bead 43a has higher rigidity than the other portions of the vertical surface 43. The vertical surface 43 has through holes 43b on the upper right side and lower left side of the bead 43a. The bead 43a corresponds to a load transmission promoting portion.

[0064] As shown in FIG. 6, the vertical surface portion 43 has a first upper joining portion 45 and a second upper joining portion 46 at its upper end. The first upper joining portion 45 is located on the right side of the second upper joining portion 46. The vertical surface portion 43 has a first inner joining portion 47 and a second inner joining portion 48 at its left end. The first inner joining portion 47 is located above the second inner joining portion 48. The vertical surface portion 43 has a lower joining portion 49 at its lower end. The first upper joining portion 45, the second upper joining portion 46, the first inner joining portion 47, the second inner joining portion 48, and the lower joining portion 49 extend forward on the front vertical surface portion 43, while extending backward on the rear vertical surface portion 43.

[0065] As shown in FIGS. 7 and 9, the first upper joining portion 45 and the second upper joining portion 46 are joined to the lower surface of the inner upper wall portion 21. As shown in FIG. 9, the first upper joining portion 45 and the second upper joining portion 46 are located above the connecting surface portion 33. The second upper joining portion 46 is vertically overlapped and joined to the inner upper wall portion 21 and the welding margin 63 of the bracket 62. That is, at the position of the second upper joining portion 46, there is a three-layer joint of the second upper joining portion 46, the inner upper wall portion 21, and the welding margin 63 of the bracket 62.

[0066] As shown in FIGS. 7 and 9, the first inner joining portion 47 is joined to the right side surface of the inner wall portion 23. As shown in FIG. 9, the first inner joining portion 47 is horizontally overlapped and joined to the inner wall portion 23 and the floor panel joining portion 3b. That is, at the position of the first inner joining portion 47, there is a three-layer joint of the first inner joining portion 47, the inner wall portion 23, and the floor panel joining portion 3b. The first inner joining portion 47 vertically overlaps with the upper end portion of the bead 43a.

[0067] As shown in FIGS. 7 and 9, the second inner joining portion 48 is joined to the right side surface of the inner bent portion 41b. As shown in FIG. 9, the second inner joining portion 48 is horizontally overlapped and joined to the inner bent portion 41b and the inner wall portion 23. That is, at the position of the second inner joining portion 48, there is a three-layer joint of the second inner joining portion 48, the inner bent portion 41b, and the inner wall portion 23. The second inner joining portion 48 vertically overlaps with the connecting surface portion 33.

[0068] As shown in FIGS. 8 and 9, the lower joint portion 49 is joined to the upper surface of the horizontal surface portion 41a. The lower joint portion 49 has a wider joint width compared to the first upper joint portion 45, the second upper joint portion 46, the first inner joint portion 47, and the second inner joint portion 48. As shown in FIG. 9, the lower joint portion 49 is located below the connecting surface portion 33.

[0069] As described above, the vertical surface portion 43 is joined and fixed to the horizontal surface portion 41a, the inner bent portion 41b, the inner upper wall portion 21, and the inner wall portion 23. Since three sides of the upper end portion, the left end portion, and the lower end portion of the vertical surface portion 43 are fixed, it is easy to maintain the shape even when a load is input from the right side.

[0070] As shown in FIG. 6, the horizontal surface portion 44 is located below the first upper joint portion 45 and the second upper joint portion 46 and above the lower joint portion 49. The horizontal surface portion 44 has a recess 44a that is recessed downward in the center in the front-rear direction. As shown in FIG. 4, the horizontal surface portion 44 overlaps the connecting surface portion 33 in the vertical direction. The horizontal surface portion 44 is spaced apart from the connecting surface portion 33 in the left-right direction. The horizontal surface portion 44 is located to the right of the protruding portion 41d and overlaps the protruding portion 41d in the left-right direction. The horizontal surface portion 44 is fixed to the protruding portion 41d by welding.

[0071] (Operation of the side sill during side impact) Here, in a structure where the battery B is disposed below the floor panel 3, it is required to prevent the collision load during side impact from being input to the battery B as much as possible. Therefore, in the present embodiment, as described above, the outer reinforcement 30 and the inner reinforcement 40 are arranged so that the collision load during side impact is transmitted to the floor panel 3 and the cross member 60. Hereinafter, the operation of the side sill during side impact will be described with reference to FIGS. 10 to 12. FIGS. 10 to 12 show a case where a collision body M collides from the right side in the vicinity of the center pillar 9.

[0072] As shown in FIG. 10, assume that the impact body M travels to the left and comes into contact with the side sill 2. At this time, the outer panel 10 deforms and the outer reinforcement 30 is displaced to the left. As a result, the connecting surface portion 33 of the outer reinforcement 30 and the second inner reinforcement 42 come into contact with each other. The connecting surface portion 33 contacts a portion of the second inner reinforcement 42 that is below the first upper joint portion 45 and the second upper joint portion 46 and above the lower joint portion 49, particularly, the horizontal surface portion 44.

[0073] When the connecting surface portion 33 and the second inner reinforcement 42 come into contact with each other, the impact load is transmitted from the outer reinforcement 30 to the second inner reinforcement 42. The second inner reinforcement 42 has a vertical surface portion 43 fixed to the inner upper wall portion 21 and the inner wall portion 23. Since the vertical surface portion 43 has beads 43a, the impact load is transmitted to the left and upward via the beads 43a. Since the floor panel 3 and the cross member 60 are fixed to the left and upper portions of the side sill 2, the impact load is transmitted from the second inner reinforcement 42 to the floor panel 3 and the cross member 60.

[0074] From the state of FIG. 10, as shown in FIG. 11, when the impact body M penetrates to the left, the outer reinforcement 30 deforms due to the repulsive load from the vertical surface portion 43. Since the lower surface portion 32 of the outer reinforcement 30 has a deformation promoting portion 36 at the corner between the lower surface portion 32 and the lower flange 35, it is more likely to be displaced compared to the upper surface portion 31. Therefore, when the repulsive load is input, the lower surface portion 32 rotates and displaces upward with the corner as a fulcrum. Along with the displacement of the lower surface portion 32, the upper surface portion 31 and the connecting surface portion 33 are displaced upward. As a result, the second inner reinforcement 42 is pushed upward to the left. As a result, the impact load is efficiently transmitted from the outer reinforcement 30 to the floor panel 3 and the cross member 60.

[0075] Further, the second inner reinforcement 42 rotates and displaces due to the collision load. Since the vertical center C2 of the vertical surface portion 43 is located above the vertical center C1 of the connecting surface portion 33, the second inner reinforcement 42 rotates and displaces upward toward the left side. Therefore, even if the second inner reinforcement 42 rotates and displaces, the collision load is efficiently transmitted from the outer reinforcement 30 to the floor panel 3 and the cross member 60.

[0076] Also, since the left end portion of the bead 43a is located below the vertical center C3 of the cross member 60, even if the second inner reinforcement 42 rotates and displaces upward, the bead 43a and the cross member 60 are likely to remain in an overlapping position in the vertical direction. Thereby, the collision load is efficiently transmitted from the outer reinforcement 30 to the cross member 60.

[0077] When the collision body M intrudes from the state of FIG. 11 as shown in FIG. 12, the second inner reinforcement 42 is crushed. Since the material strength of the second inner reinforcement 42 is lower than the material strength of the outer reinforcement 30, the second inner reinforcement 42 is crushed earlier than the outer reinforcement 30. By crushing the second inner reinforcement 42, a part of the collision load is absorbed. Since the connecting surface portion 33 abuts on a portion of the second inner reinforcement 42 that is below the first upper joint portion 45 and the second upper joint portion 46 and above the lower joint portion 49, the shapes of the upper end portion, the left end portion, and the lower end portion are likely to be maintained. Thereby, it is possible to simultaneously execute the absorption of the collision load due to the crushing of the second inner reinforcement 42 and the transmission of the load through the second inner reinforcement 42.

[0078] (Effects of the Embodiment) As described above, in the present embodiment, the side sill 2 includes an outer wall portion 13 which is a wall surface located on the outer side in the vehicle width direction and extending in the vertical direction and the longitudinal direction, an inner wall portion 23 which is a wall surface located on the inner side in the vehicle width direction and extending in the vertical direction and the longitudinal direction, an outer upper wall portion 11 extending in the vehicle width direction from the upper end portion of the outer wall portion 13, an inner upper wall portion 21 extending in the vehicle width direction from the upper end portion of the inner wall portion 23, an outer lower wall portion 12 extending in the vehicle width direction from the lower end portion of the outer wall portion 13, an inner lower wall portion 22 extending in the vehicle width direction from the lower end portion of the inner wall portion 23, an outer reinforcement 30 fixed to the outer wall portion 13 inside the closed cross-section structure, and an inner reinforcement 40 fixed to the inner upper wall portion 21 and the inner wall portion 23 inside the closed cross-section structure. The cross member 60 is fixed to the inner upper wall portion 21, the battery B is supported by the inner lower wall portion 22, the outer reinforcement 30 has a connecting surface portion 33 which is located on the inner side in the vehicle width direction than other portions of the outer reinforcement 30 and whose vertical position overlaps with that of the inner reinforcement 40. The inner reinforcement 40 is fixed to the inner upper wall portion 21 and the inner wall portion 23 and has a vertical surface portion 43 extending in the vertical direction and the vehicle width direction. The vertical surface portion 43 overlaps with the cross member 60 in the vehicle longitudinal direction and has a bead 43a for transmitting the collision load input through the connecting surface portion 33 to the cross member 60 during a side impact. Thus, when the outer wall portion 13 is displaced inward in the vehicle width direction due to a side impact, the connecting surface portion 33 abuts against the inner reinforcement 40. The inner reinforcement 40 has a vertical surface portion 43 fixed to the inner upper wall portion 21 and the inner wall portion 23, and since the vertical surface portion 43 has a bead 43a, the load transmitted from the outer reinforcement 30 to the inner reinforcement 40 is transmitted inward and upward in the vehicle width direction via the bead 43a. Since the cross member 60 is fixed above the battery B in the inner side portion in the vehicle width direction of the side sill 2, the collision load is transmitted from the inner reinforcement 40 to the cross member 60. As a result, the transmission of the collision load to the battery B disposed below the floor panel 3 is suppressed.

[0079] In addition, since the bead 43a has higher rigidity than other parts of the vertical surface portion 43, it is easier to transmit the collision load compared to other parts of the vertical surface portion 43. As a result, the collision load is efficiently transmitted from the outer reinforcement 30 to the cross member 60 via the bead 43a, so that it is possible to suppress the collision load during a side impact from being transmitted to the battery B.

[0080] Moreover, since the bead 43a can be easily formed, a load transmission promoting portion can be easily provided.

[0081] In the present embodiment, the outer end of the bead 43a in the vehicle width direction overlaps the connecting surface portion 33 in the vertical direction, and the inner end of the bead 43a in the vehicle width direction overlaps the cross member 60 in the vertical direction. As a result, the collision load is efficiently transmitted from the outer reinforcement 30 to the cross member 60 via the bead 43a. As a result, it is possible to suppress the collision load during a side impact from being transmitted to the battery.

[0082] In the present embodiment, the vertical center C2 of the vertical surface portion 43 is located above the vertical center C1 of the connecting surface portion 33 and below the vertical center C3 of the cross member 60. As a result, the collision load is efficiently transmitted via the bead 43a from a position outside and below in the vehicle width direction to a position inside and above in the vehicle width direction. Further, even if the vertical surface portion 43 rotates and displaces due to the collision load when the connecting surface portion 33 abuts on the inner reinforcement 40, the vertical surface portion 43 rotates and displaces inward and upward in the vehicle width direction toward the cross member 60. Therefore, the transmission path of the collision load from the outer reinforcement 30 to the cross member 60 is likely to be maintained. Therefore, it is possible to suppress the collision load during a side impact from being transmitted to the battery B.

[0083] In this embodiment, the connecting surface portion 33 has a surface that extends in the vehicle front-rear direction and the vertical direction, and the positions of the cross member 60 and the connecting surface portion 33 overlap in the vehicle front-rear direction. As a result, since the connecting surface portion 33 contacts the vertical surface portion 43 in as wide a range as possible, the collision load can be dispersed and input to the vertical surface portion 43. By dispersing the collision load and inputting it to the vertical surface portion 43, crushing of the vertical surface portion 43 can be suppressed as much as possible. On the other hand, even if the collision load is dispersed and input to the vertical surface portion 43, due to the bead 43a, the collision load is efficiently transmitted toward the cross member 60. Further, since the positions of the connecting surface portion 33 and the cross member 60 overlap in the vehicle front-rear direction, the transmission path of the collision load can be made as short as possible. Thereby, it is possible to suppress the collision load at the time of side collision from being transmitted to the battery B.

[0084] In this embodiment, the outer reinforcement 30 has an upper surface portion 31 that extends outward in the vehicle width direction from the upper end of the connecting surface portion 33 toward the outer wall portion 13, and a lower surface portion 32 that extends outward in the vehicle width direction from the lower end of the connecting surface portion 33 toward the outer wall portion 13. A closed cross-section can be formed by the outer wall portion 13 and the outer reinforcement 30, and the rigidity of the outer reinforcement 30 is improved. Thereby, the collision load can be efficiently transmitted from the outer reinforcement 30 to the vertical surface portion 43, and it is possible to suppress the collision load at the time of side collision from being transmitted to the battery B.

[0085] In this embodiment, the battery B is supported by the inner lower wall portion 22, and the lower end of the connecting surface portion 33 is located above the inner lower wall portion 22. As a result, the collision load is less likely to be directly transmitted from the connecting surface portion 33 to the battery B. Thereby, it is possible to suppress the collision load at the time of side collision from being transmitted to the battery B.

[0086] In this embodiment, the inner reinforcement 40 has a horizontal surface portion 41a that overlaps with the region where the battery B is disposed in the vehicle longitudinal direction, extends in the vehicle longitudinal direction and vehicle width direction, and is fixed to the inner side wall portion 23. The horizontal surface portion 41a is located between the inner lower wall portion 22 and the vertical surface portion 43 in the vertical direction. Thereby, even when the vertical surface portion 43 rotates and displaces due to a collision load when the connecting surface portion 33 abuts against the inner reinforcement 40, the horizontal surface portion 41a can suppress the vertical surface portion 43 from displacing downward. Thereby, it is possible to suppress the collision load from being directly transmitted to the support portion of the battery B.

[0087] In this embodiment, the vertical surface portion 43 is fixed to the horizontal surface portion 41a. Thereby, even when the side collision position is at a position other than the position of the vertical surface portion 43, the collision load is transmitted to the vertical surface portion 43 via the horizontal surface portion 41a. Thereby, the collision load is efficiently transmitted from the outer reinforcement 30 to the cross member 60 via the horizontal surface portion 41a and the vertical surface portion 43. As a result, it is possible to suppress the collision load at the time of a side collision from being transmitted to the battery B.

[0088] (Modification 1) FIG. 13 shows a first modification of the lower vehicle body structure. In this modification, no bead is provided on the vertical surface portion 143. Instead, a thick portion 143a in which a part of the vertical surface portion 143 is thicker than other parts is formed, thereby constituting a load transmission promoting portion.

[0089] The thick portion 143a is formed by attaching a patch material. The patch material has an elongated rectangular shape. The patch material is a plate material having the same thickness as the vertical surface portion 143. The patch material is attached on the diagonal line of the vertical surface portion 143 so as to incline upward from the right side to the left side.

[0090] The right end portion of the thick portion 143a overlaps with the connecting surface portion 33 of the outer reinforcement 30 in the vertical direction. The left end portion of the thick portion 143a is located above the floor panel 3 and overlaps with the cross member 60 in the vertical direction.

[0091] The thick portion 143a has higher rigidity than the other portions of the vertical surface portion 143. As a result, the thick portion 143a facilitates the transmission of the collision load input via the connection surface portion 33 during a side collision.

[0092] In this Modification 1, during a side collision, when the connection surface portion 33 abuts on the inner reinforcement 40, the collision load is transmitted inward and upward in the vehicle width direction via the thick portion 143a. Thereafter, the collision load is transmitted from the inner reinforcement 40 to the cross member 60. As described above, it is possible to suppress the transmission of the collision load during a side collision to the battery B.

[0093] (Modification 2) FIG. 14 shows a Modification 2 of the lower vehicle body structure. In this modification, no bead is provided on the vertical surface portion 243. Instead, a load transmission promoting portion 243a is formed by configuring a part of the vertical surface portion 243 with a different material.

[0094] The load transmission promoting portion 243a is formed of a metal plate having a higher material strength than the other portions of the vertical surface portion 243. The right end portion of the load transmission promoting portion 243a overlaps the connection surface portion 33 of the outer reinforcement 30 in the vertical direction. The left end portion of the load transmission promoting portion 243a is located above the floor panel 3 and overlaps the cross member 60 in the vertical direction.

[0095] The load transmission promoting portion 243a has higher rigidity than the other portions of the vertical surface portion 143. As a result, the load transmission promoting portion 243a facilitates the transmission of the collision load input via the connection surface portion 33 during a side collision.

[0096] In this Modification 2, when the connecting surface portion 33 abuts against the inner reinforcement 40 during a side collision, the collision load is transmitted inward and upward in the vehicle width direction via the load transmission promoting portion 243a. Thereafter, the collision load is transmitted from the inner reinforcement 40 to the cross member 60. As described above, it is possible to suppress the collision load during a side collision from being transmitted to the battery B.

[0097] (Other Embodiments) The technology disclosed herein is not limited to the foregoing embodiments, and substitutions are possible without departing from the gist of the claims.

[0098] In the foregoing embodiment, the vertical center C2 of the vertical surface portion 43 was located above the vertical center of the connecting surface portion 33. However, the vertical center C2 of the vertical surface portion 43 may be located at the same vertical position as the vertical center C1 of the connecting surface portion 33.

[0099] In the foregoing embodiment, the inner reinforcement 40 had the first inner reinforcement 41 and the second inner reinforcement. However, the inner reinforcement 40 may be composed of only the second inner reinforcement.

[0100] In the foregoing embodiment, the vertical surface portion 43 was fixed to the horizontal surface portion 41a. However, the vertical surface portion 43 may not be fixed to the horizontal surface portion 41a.

[0101] In the foregoing embodiment, the lower end of the connecting surface portion 33 was above the horizontal surface portion 41a. However, as long as the lower end of the connecting surface portion 33 is above the support portion 80, it may be located below the horizontal surface portion 41a. In particular, the connecting surface portion 33 may overlap the horizontal surface portion 41a in the vertical direction.

[0102] In the foregoing embodiment, the second inner reinforcement 42 had the horizontal surface portion 44, but the horizontal surface portion 44 is not an essential configuration and may be omitted.

[0103] In the above embodiment, the corner between the lower surface portion 32 and the lower flange 35 had the deformation promoting portion 36, but the deformation promoting portion 36 is not an essential configuration and may be omitted.

[0104] The foregoing embodiments are merely illustrative and should not be construed as limiting the scope of the present disclosure. The scope of the present disclosure is defined by the claims, and all modifications and changes belonging to the equivalent scope of the claims are within the scope of the present disclosure.

Industrial Applicability

[0105] The technology disclosed herein is useful as a lower vehicle body structure of a vehicle.

Explanation of Signs

[0106] 2 Side sill 3 Floor panel 11 Outer upper wall portion 12 Outer lower wall portion 13 Outer wall portion 21 Inner upper wall portion 22 Inner lower wall portion 23 Inner wall portion 30 Outer reinforcement 33 Connecting surface portion (overlapping portion) 40 Inner reinforcement 41a Horizontal surface portion 41b Inner bent portion 43 Vertical surface portion 43a Bead (load transmission promoting portion) 60 Cross member 143 Vertical surface portion 143a Thick portion (load transmission promoting portion) 243 Vertical surface portion 243a Load transmission promoting portion B Battery

Claims

1. A lower vehicle body structure, comprising: A pair of left and right side sills having a closed cross-sectional structure extending in the vehicle longitudinal direction; A floor panel fixed to the side sill and constituting the floor surface of the vehicle cabin; A battery disposed below the floor panel; A cross member extending in the vehicle width direction, with both ends in the vehicle width direction fixed to the side sill above the floor panel; The side sill includes: An outer wall portion that is located on the outer side in the vehicle width direction and has a wall surface extending in the vertical direction and the vehicle longitudinal direction; An inner wall portion that is located on the inner side in the vehicle width direction and has a wall surface extending in the vertical direction and the vehicle longitudinal direction; An upper wall portion extending in the vehicle width direction from the upper end portions of the outer wall portion and the inner wall portion; A lower wall portion extending in the vehicle width direction from the lower end portions of the outer wall portion and the inner wall portion; An outer reinforcement fixed to the outer wall portion inside the closed cross-sectional structure; An inner reinforcement fixed to the upper wall portion and the inner wall portion inside the closed cross-sectional structure; And has: The cross member is fixed to the upper wall portion; The outer reinforcement has an overlapping portion that is located on the inner side in the vehicle width direction compared to other portions of the outer reinforcement and has an overlapping vertical position with the inner reinforcement; The inner reinforcement is fixed to the upper wall portion and the inner wall portion and has a vertical surface portion extending in the vertical direction and the vehicle width direction; The vertical surface portion has an overlapping position in the vehicle longitudinal direction with the cross member and has a load transmission promotion portion for transmitting a collision load input through the overlapping portion to the cross member during a side impact. A lower vehicle body structure of a vehicle.

2. In the lower vehicle body structure of the vehicle according to Claim 1, The outer end portion in the vehicle width direction of the load transmission promotion portion has an overlapping vertical position with the overlapping portion; The inner end portion in the vehicle width direction of the load transmission promotion portion has an overlapping vertical position with the cross member. A lower vehicle body structure of a vehicle.

3. In the lower vehicle body structure of the vehicle according to Claim 2, The vertical center of the vertical surface portion is located above the vertical center of the overlapping portion and below the vertical center of the cross member. A lower vehicle body structure of a vehicle.

4. In the lower vehicle body structure of the vehicle according to Claim 3, The load transmission promotion portion is a portion with higher rigidity than other portions of the vertical surface portion. A lower vehicle body structure of a vehicle.

5. In the lower body structure of the vehicle according to claim 4, The load transfer promoting portion is a bead portion that continuously extends from the end on the outer side in the vehicle width direction to the end on the inner side in the vehicle width direction, and is a lower body structure of the vehicle.

6. In the lower body structure of the vehicle according to claim 1, The overlapping portion has a surface that extends in the vehicle longitudinal direction and the vertical direction, and the position in the vehicle longitudinal direction overlaps with the cross member, and is a lower body structure of the vehicle.

7. In the lower body structure of the vehicle according to claim 6, The outer reinforcement has an upper surface portion that extends outward in the vehicle width direction from the upper end of the overlapping portion toward the outer wall portion, and a lower surface portion that extends outward in the vehicle width direction from the lower end of the overlapping portion toward the outer wall portion, and is a lower body structure of the vehicle.

8. In the lower body structure of the vehicle according to claim 6, The battery is supported by a portion on the inner side in the vehicle width direction of the overlapping portion in the lower wall portion, The lower end of the overlapping portion is located above the lower wall portion, and is a lower body structure of the vehicle.

9. In the lower body structure of the vehicle according to claim 8, The inner reinforcement has a horizontal surface portion that overlaps the region where the battery is disposed in the vehicle longitudinal direction, extends in the vehicle longitudinal direction and the vehicle width direction, and is fixed to the inner wall portion, The horizontal surface portion is located between the lower wall portion and the vertical surface portion in the vertical direction, and is a lower body structure of the vehicle.

10. In the lower body structure of the vehicle according to claim 9, The vertical surface portion is fixed to the horizontal surface portion, and is a lower body structure of the vehicle.

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