Body floor structure

Abstract

To control a deformation position of a floor cross member when receiving an impact load due to side collision, and suppress damage of a loaded object loaded on a vehicle.SOLUTION: A first cross member 20 extending in a width direction is provided on the upper surface of a floor panel 1, one end of the first floor cross member 20 is joined to a side sill 15, the other end thereof is joined to a floor tunnel 10, the first floor cross member 20 has a convex lateral cross-sectional shape projecting upward, a member upper face part 21 extending in a vehicle width direction is provided on the upper part of the convex, and a fragile part 21b is provided in a longitudinal direction on the member upper face part 21.SELECTED DRAWING: Figure 3

Description

[Technical Field]

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

[0002] A floor panel that constitutes the floor portion of the vehicle body is provided with a floor tunnel that extends in the fore-and-aft direction of the vehicle with the upper surface of the floor panel raised, and side sills that extend in the fore-and-aft direction of the vehicle are provided on both sides of the floor panel in the vehicle width direction. In such a structure, for example, as disclosed in Patent Document 1, a structure in which a floor cross member that connects the side sill and the floor tunnel is provided on the upper surface of the floor panel is known.

[0003] In this example, the floor cross member is formed so that its height in the vertical direction of the vehicle increases from the floor tunnel toward the side sill, and its width in the longitudinal direction of the vehicle increases from the side sill toward the floor tunnel. By forming the floor cross member in this way, it is intended to effectively transmit the collision load in the event of a side collision of the vehicle to the opposite side of the collision. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Japanese Patent Application Laid-Open No. 2017-43201 Summary of the Invention [Problem to be solved by the invention]

[0005] However, in the structure of the above example, if the height of the floor cross member is increased to improve the strength of the floor cross member, it will narrow the space inside the vehicle cabin and compress that space, and if the height of the floor cross member is reduced to ensure the volume of the vehicle cabin space, the strength of the floor cross member will decrease and it may not be able to effectively transmit impact loads.

[0006] Furthermore, if the height and width of the floor cross member are reduced and its rigidity is simply improved by, for example, increasing its thickness, the floor cross member may deform in an unintended position when an impact load is applied. If the floor cross member deforms in an unintended position, loads such as seats near the floor cross member may move beyond the permissible range, making it impossible to maintain the safety of the interior space. Therefore, in a vehicle body structure made up of existing components, there is room for improvement in the structure of the above example in order to achieve both ensuring the spatial volume of the vehicle interior and shock absorption performance in a side collision.

[0007] The present invention has been made to solve the above-mentioned problems, and its purpose is to provide a vehicle floor structure that can control the deformation position of the floor cross member when subjected to impact loads such as those caused by a side collision, thereby improving the safety of the vehicle interior space. [Means for solving the problem]

[0008] The vehicle body floor structure of the present invention for achieving the above object includes a floor panel disposed on the floor of the vehicle body, a side sill provided on the outer side of the floor panel in the vehicle width direction and extending in the vehicle longitudinal direction, and a floor tunnel provided in the vehicle width intermediate portion of the floor panel and extending in the vehicle longitudinal direction while protruding upward from the upper surface of the floor panel. In the vehicle body floor structure, a cross member extending in the vehicle width direction is provided on the upper surface of the floor panel, one end of the cross member is joined to the side sill and the other end is joined to the floor tunnel, the cross member has a convex cross section that protrudes upward from the vehicle, front and rear wall surfaces are inclined, an upper portion of the convex shape is provided with an upper surface portion extending in the vehicle width direction, and the upper surface portion is provided with a weakened portion along the vehicle longitudinal direction. The other end of the cross member widens in the vehicle longitudinal direction as it moves from the weakened portion toward the inside in the vehicle width direction. There are. [Effects of the Invention]

[0009] According to the present invention, the deformation position of the floor cross member when subjected to an impact load due to a side collision or the like can be controlled, thereby improving the safety of the vehicle interior space. [Brief explanation of the drawings]

[0010] [Figure 1] 1 is a perspective view showing an embodiment of a vehicle body floor structure according to the present invention; [Figure 2] 2 is an enlarged perspective view showing a first floor cross member of FIG. 1. FIG. [Figure 3] FIG. 2 is a top view showing the first floor cross member and the second floor cross member of FIG. 1. [Figure 4] 2 is a bottom view of the first floor cross member and the like in FIG. 1 as viewed from below the vehicle, with the floor tunnel omitted. [Figure 5] 2 is an enlarged perspective view showing the first floor cross member of FIG. 1 with the floor panel omitted. FIG. [Figure 6] 2 is a side view of the first floor cross member of FIG. 1 alone, as viewed from the inside in the vehicle width direction. FIG. [Figure 7] FIG. 7 is a top view of FIG. [Figure 8] 7 is a side view of the first floor cross member of FIG. 6 as seen from the outside in the vehicle width direction. DETAILED DESCRIPTION OF THE INVENTION

[0011] Hereinafter, one embodiment of a vehicle body floor structure according to the present invention will be described with reference to the drawings (FIGS. 1 to 8). In the drawings, the direction of the arrow Fr indicates the front in the longitudinal direction of the vehicle. In the description of the embodiment, the "front (front end) and rear (rear end)" correspond to the front and rear in the longitudinal direction of the vehicle. Furthermore, the arrows R and L indicate the right and left sides when an occupant looks forward of the vehicle.

[0012] As shown in Figures 1 and 2, the vehicle floor structure of this embodiment has a floor panel 1, a floor tunnel 10, a side sill 15, a first floor cross member (cross member) 20, a second floor cross member 29, a floor side member 14, an outer seat bracket (seat bracket) 30, and an inner seat bracket 38.

[0013] The floor panel 1 is a panel material arranged on the floor portion of the vehicle body. In this example, the floor panels 1 are arranged on the left and right sides of the floor tunnel 10. Each of the left and right floor panels 1 extends from the lower end of the dash panel 2 toward the rear of the vehicle.

[0014] As shown in FIGS. 1 to 3, the floor tunnel 10 is a member that extends in the longitudinal direction of the vehicle while protruding from the upper surface of the floor panel 1 above the vehicle. The floor tunnel 10 has a tunnel upper surface portion 11 that extends in the longitudinal direction of the vehicle, and tunnel side wall portions 12 that are provided on the left and right ends of the tunnel upper surface portion 11 and extend in the longitudinal direction of the vehicle. The tunnel side wall portions 12 are inclined outward in the transverse direction of the vehicle as they extend from the outer end of the tunnel upper surface portion 11 toward the bottom of the vehicle, and the lower end of the tunnel side wall portions 12 is joined to the inner end of the floor panel 1 in the transverse direction. In this example, a flange 13 that protrudes in the transverse direction of the vehicle is provided at the lower end of the tunnel side wall portions 12 (FIG. 4), and the flange 13 is joined to the inner end of the floor panel 1 in the transverse direction by spot welding.

[0015] 2, the side sill 15 is a member provided at the outer end of the floor panel 1 in the vehicle width direction and extending in the vehicle front-rear direction. Although detailed explanation using illustrations is omitted, the side sill 15 has an inner member 16 extending in the vehicle front-rear direction and an outer member 18 extending in the vehicle front-rear direction.

[0016] 2 and 3, the inner member 16 has an inner wall portion 16a facing the inner side in the vehicle width direction, an upper surface portion 16b extending outward in the vehicle width direction from an upper end of the inner wall portion 16a, and a flange portion 16c protruding upward from the outer end of the upper surface portion 16b in the vehicle width direction. The outer member 18 is disposed outward in the vehicle width direction of the inner member 16, and has an outer wall portion 18a, an upper surface portion 18b extending inward in the vehicle width direction from an upper end of the outer wall portion 18a, and a flange portion 18c protruding upward from the inner end of the upper surface portion 18b in the vehicle width direction.

[0017] The flange portion 16c of the inner member 16 and the flange portion 18c of the outer member 18 are joined by spot welding, etc. A description of the structure of the lower portion of the side sill 15 will be omitted.

[0018] Next, the first floor cross member 20 will be described. As shown in Figures 1 and 2, the first floor cross member 20 is a member that extends linearly in the vehicle width direction and is provided on the upper surface of the floor panel 1. In this example, multiple flanges provided on the lower part of the first floor cross member 20 are joined to the upper surface of the floor panel 1 by spot welding or the like. Joints such as flanges will be described later. In addition, one end of the first floor cross member 20 is joined to the side sill 15, and the other end is joined to the floor tunnel 10. In this example, the outer end of the first floor cross member 20 in the vehicle width direction is joined to the inner wall portion 16a of the inner member 16 of the side sill 15 by spot welding or the like, and the inner end of the first floor cross member 20 in the vehicle width direction is joined to the tunnel side wall portion 12 of the floor tunnel 10 by spot welding or the like.

[0019] The shape of the first floor cross member 20 will now be described. The first floor cross member 20 is a member that extends in the vehicle width direction as a whole, and has a convex cross-sectional shape that protrudes upward from the vehicle. As shown in Figures 6 to 8, the first floor cross member 20 has a member upper surface portion (upper surface portion) 21 located at the top of the convex shape, a member front portion 22 located at the front of the convex shape, and a member rear portion 25 located at the rear of the convex shape.

[0020] As shown in FIG. 7 , the member upper surface portion 21 has a linear portion 21a and a flared surface portion 21e. The linear portion 21a has a generally rectangular shape facing upward in the vehicle and is disposed parallel to the floor panel 1. The flared surface portion 21e is parallel to the floor panel 1, faces upward in the vehicle, and is continuous with the linear portion 21a on the inner side in the vehicle width direction. The flared surface portion 21e is formed so that its width in the vehicle front-rear direction increases toward the inner side in the vehicle width direction. That is, the front end of the flared surface portion 21e slopes toward the front of the vehicle as it moves toward the inner side in the vehicle width direction, and the rear end of the flared surface portion 21e slopes toward the rear of the vehicle as it moves toward the inner side in the vehicle width direction. In this example, the front and rear ends of the flared surface portion 21e slope away from each other toward the inner side in the vehicle width direction and are symmetrical with respect to a center line extending in the vehicle width direction between the front and rear ends.

[0021] A longitudinal bead portion (weak portion) 21b is provided along the longitudinal direction of the vehicle on the member upper surface portion 21. The longitudinal bead portion 21b is located between the straight portion 21a and the widened surface portion 21e, is recessed downward from the upper surface of the member upper surface portion 21, and extends in the longitudinal direction of the vehicle. In this example, the longitudinal bead portion 21b extends over the entire area of ​​the member upper surface portion 21 from the front end to the rear end.

[0022] Additionally, the straight portion 21a of the member upper surface portion 21 is provided with a widthwise inner bead portion 21c and a widthwise outer bead portion 21d that extend in the vehicle width direction. The widthwise inner bead portion 21c and the widthwise outer bead portion 21d are disposed at the center of the straight portion 21a in the vehicle front-rear direction and are disposed at a distance from each other in the vehicle width direction. The front-rear bead portion 21b is disposed between the vehicle width direction inner end of the widthwise inner bead portion 21c and the floor tunnel 10. Note that the widthwise beads 21c, 21d are not shown in FIGS. 1 to 5.

[0023] As shown in Figures 6 to 8, the member front portion 22 has a front inclined wall portion 22a, a front vertical wall portion 22b, a spreading wall portion 22c, a front lower member flange portion 23, a front inner member flange portion 24a, and a front outer member flange portion 24b. The front inclined wall portion 22a is a wall portion that extends from the vehicle width direction outer portion of the front end of the spreading surface portion 21e and the front end of the straight portion 21a, and is inclined toward the front of the vehicle as it moves downward toward the vehicle, and extends in the vehicle width direction as a whole. The lower end of the front inclined wall portion 22a has a portion that is connected to the front vertical wall portion 22b and a portion that is connected to the front lower member flange portion 23. The portion that is connected to the front lower member flange portion 23 is located on the vehicle width direction outer portion of the lower end of the front inclined wall portion 22a.

[0024] The front vertical wall portion 22b is a vertical wall extending downward from the lower end of the front inclined wall portion 22a in the vehicle width direction. The vehicle width-direction inner end of the front vertical wall portion 22b is located in the vehicle width-direction intermediate portion of the flared surface portion 21e, and has a so-called tapered shape in which the vehicle vertical dimension gradually decreases toward the vehicle width-direction inner side (FIG. 7). In this example, the upper end of the front vertical wall portion 22b extends in the vehicle width direction, and the vehicle width-direction inner portion at the lower end is inclined upward toward the vehicle width-direction inner side as it approaches the vehicle width-direction inner side. The vehicle width-direction inner end of the front vertical wall portion 22b is disposed adjacent to the vehicle width-direction inner end of the front inclined wall portion 22a. The upper end of the tapered portion of the front vertical wall portion 22b is connected to the front inclined wall portion 22a, and the lower end of the tapered portion is connected to the flared wall portion 22c.

[0025] Furthermore, the vehicle width direction outer end of the front vertical wall portion 22b is located slightly inward of the vehicle width direction outer end of the straight portion 21a of the member upper surface portion 21. Similar to the inner portion, the vehicle width direction outer portion of the front vertical wall portion 22b is formed so that the dimension in the vehicle up-down direction gradually decreases toward the vehicle width direction outer side, forming a tapered shape. The upper end of the vehicle width direction outer portion of the front vertical wall portion 22b is inclined slightly downward toward the vehicle width direction outer side, and the lower end is inclined slightly upward toward the vehicle width direction outer side, thereby forming a tapered shape of the outer portion of the front vertical wall portion 22b. Note that the front vertical wall portion 22b is not shown in Figures 1 to 5.

[0026] Next, the splay wall portion 22c of the member front portion 22 will be described. As shown in FIGS. 2, 3, and 7, the splay wall portion 22c is a wall portion formed on the vehicle width direction inner side of the front inclined wall portion 22a, and is inclined toward the vehicle front from the vehicle width direction inner side of the front end of the splay surface portion 21e of the member upper surface portion 21 toward the vehicle lower side. Similarly to the inclination of the front end of the splay surface portion 21e, the splay wall portion 22c is also inclined toward the vehicle front as it moves toward the vehicle width direction inner side. Furthermore, the vehicle width direction outer side of the splay wall portion 22c extends outward in the vehicle width direction beyond the vehicle width direction inner side end of the front vertical wall portion 22b. In this example, the outer side end of the splay wall portion 22c is located at a position corresponding to the longitudinal bead portion 21b. Furthermore, the vehicle width direction inner side of the front vertical wall portion 22b and the vehicle width direction outer side of the splay wall portion 22c are arranged side by side in the vehicle fore-and-aft direction (vehicle up-and-down direction).

[0027] Furthermore, in this embodiment, the lower end of the vehicle width direction outer portion (the inclined wall portion located at the vehicle width direction end of the cross member) of the front inclined wall portion 22a of the member front portion 22 is farther from the member upper surface portion 21 (the upper end of the inclined wall portion) than the lower end of the vehicle width direction intermediate portion (the inclined wall portion at the vehicle width direction intermediate portion of the cross member) of the front inclined wall portion 22a, and the lower end of the spreading wall portion 22c of the member rear portion 25 is farther from the member upper surface portion 21 (the upper end of the inclined wall portion) than the lower end of the rear inclined wall portion 25a. In other words, the lower end of the vehicle width direction outer portion of the front inclined wall portion 22a is located further forward of the vehicle than the lower end of the vehicle width direction intermediate portion, and the lower end of the vehicle width direction outer portion of the rear inclined wall portion 25a is located further rearward of the lower end of the vehicle width direction intermediate portion.

[0028] 7, the front lower member flange portion 23 is provided at the front portion of the first floor cross member 20 and is joined to the floor panel 1 by spot welding or the like, and protrudes forward from the vehicle width direction outer portions of the lower ends of the spreading wall portion 22c, the lower ends of the front vertical wall portion 22b, and the lower ends of the front inclined wall portion 22a, and extends in the vehicle width direction. A step 23e is provided in the vehicle width direction middle portion of the front lower member flange portion 23, with an upper step 23f located on the vehicle width direction inner side and a lower step 23g located on the vehicle width direction outer side. The step 23e is provided at a position corresponding to the inner end of the width direction outer bead portion 21d located on the vehicle width direction inner side.

[0029] The front end of upper step portion 23f has a portion that slopes in the same direction as the front end of spreading surface portion 21e and a portion that extends linearly outward in the vehicle width direction from the outer end of this portion. The front end of lower step portion 23g has a portion that slopes forward in the vehicle as it extends from step 23e outward in the vehicle width direction and a portion that extends linearly outward in the vehicle width direction from the outer end of this portion. An outer seat bracket 30, which will be described later, is joined to the upper surface of lower step portion 23g.

[0030] Next, the front outer member flange portion 24b and the front inner member flange portion 24a will be described. As shown in FIGS. 2 and 3 , the front outer member flange portion 24b is joined to the inner side wall 16a of the inner member 16 of the side sill 15 by spot welding or the like, and protrudes forward from the outer end of the front inclined wall portion 22a in the vehicle width direction. As shown in FIG. 8 , its front end forms an arc. The lower end of the front outer member flange portion 24b is spaced apart from the outer end of the lower step portion 23g of the front lower member flange portion 23 in the vehicle width direction. The front inner member flange portion 24a is joined to the tunnel side wall portion 12 of the floor tunnel 10 by spot welding or the like, and protrudes forward from the inner end of the widening wall portion 22c in the vehicle width direction. In addition, the lower part of the front inner member flange portion 24a is connected to the front lower member flange portion 23. The lower end of the front inner member flange portion 24a is connected to the inner end in the vehicle width direction of the upper step portion 23f of the front lower member flange portion 23, forming a corner portion.

[0031] Next, the member rear portion 25 will be described. As shown in Fig. 7, the member rear portion 25 is formed line-symmetrically with respect to, for example, the widthwise inner bead portion 21c and the widthwise outer bead portion 21d. The member rear portion 25 has a rear inclined wall portion 25a, a rear vertical wall portion 25b, a flared wall portion 25c, a rear lower-member flange portion 26, a rear inner-member flange portion 27a, and a rear outer-member flange portion 27b. The rear inclined wall portion 25a is formed in the same manner as the front inclined wall portion 22a, and is formed line-symmetrically with respect to the front inclined wall portion 22a with respect to the widthwise inner bead portion 21c, etc. The rear vertical wall portion 25b, the expanding wall portion 25c, the rear lower member flange portion 26, the rear inner member flange portion 27a, and the rear outer member flange portion 27b are similarly formed symmetrically with the front vertical wall portion 22b, the expanding wall portion 22c, the front lower member flange portion 23, the front inner member flange portion 24a, and the rear outer member flange portion 27b of the member front portion 22.

[0032] The front inclined wall portion 22a and the rear inclined wall portion 25a of the first floor cross member 20 in this example constitute the front and rear portions of the above-mentioned convex cross section, and are inclined so that they approach each other as they move upward in the vehicle. The inclination also contributes to increasing the cross-sectional area and maintaining the interior space. Since it is sufficient for the feet of the occupant to rest on the first floor cross member 20, either the front inclined wall portion 22a or the rear inclined wall portion 25a (front and rear wall surfaces) of the first floor cross member 20 may be inclined.

[0033] Each flange portion is joined in the same manner as the flange portion of the member front portion 22. In detail, the rear lower member flange portion 26 of the member rear portion 25 is joined to the upper surface of the floor panel 1 by spot welding or the like. Furthermore, the rear inner member flange portion 27a of the member rear portion 25 is joined to the tunnel side wall portion 12 of the floor tunnel 10 by spot welding or the like, and further, the rear outer member flange portion 27b of the member rear portion 25 is joined to the inner wall portion 16a of the inner member 16 of the side sill 15 by spot welding or the like.

[0034] The longitudinal bead portion 21b of the first floor cross member 20 is more vulnerable to loads in the vehicle width direction than other portions of the straight portion 21a, and is therefore more likely to deform under the action of loads in the vehicle width direction. By providing the longitudinal bead portion 21b as described above, when an impact load is input toward the floor tunnel 10 from the vehicle width outer side of the side sill 15, that is, when an impact load due to a side collision is received, it is possible to promote deformation at the position where the longitudinal bead portion 21b is provided. As a result, it is possible to control the deformation position of the first floor cross member 20 when an impact load due to a side collision or the like is received, thereby suppressing unexpected damage to cargo loaded in the vehicle and improving safety for occupants in the vehicle interior space.

[0035] The widthwise inner bead portion 21c and the widthwise outer bead portion 21d of the first floor cross member 20 have higher rigidity against a load in the vehicle width direction than other portions, and are therefore more likely to transmit the load. As described above, by providing the widthwise inner bead portion 21c and the widthwise outer bead portion 21d, the side collision load is transmitted in the vehicle width direction along the widthwise inner bead portion 21c and the widthwise outer bead portion 21d, resulting in stress concentration in the longitudinal bead portion 21b. This promotes deformation in the longitudinal bead portion 21b.

[0036] In this embodiment, as shown in FIGS. 4 and 5, the vehicle width direction inner end (the other end) of the first floor cross member 20 is arranged so as to overlap a gusset 50 provided on the back side (lower surface side) of the floor panel 1 in a top view. The gusset 50 in this example is provided on the back side of the floor tunnel 10 and reinforces the floor tunnel 10. The gusset 50 has a hat-shaped cross section in a vehicle longitudinal view so as to correspond to the shapes of the tunnel upper surface portion 11 and the tunnel side wall portion 12 of the floor tunnel 10. The vehicle width direction outer portion of the gusset 50 is joined to a flange 13 at the lower end of the tunnel side wall portion 12. In this example, the vehicle width direction outer portion of the gusset 50, the flange 13 of the tunnel side wall portion 12, and the front lower member flange portion 23 of the first floor cross member 20 are joined in a three-ply configuration. Similarly, the outer portion of the gusset 50 in the vehicle width direction, the flange 13 of the tunnel side wall portion 12, and the rear lower member flange portion 26 of the first floor cross member 20 are joined together in three layers.

[0037] Furthermore, as the other end of the first floor cross member 20 moves inward in the vehicle width direction from the longitudinal bead 21b, the width in the vehicle longitudinal direction becomes wider than the middle part of the first floor cross member 20 where the widthwise inner bead portion 21c is located, which increases the cross-sectional area of ​​the first floor cross member 20 and makes it easier for it to be supported by the floor tunnel 10. Therefore, stress is concentrated during a side collision, further promoting deformation at the longitudinal bead portion 21b.

[0038] By providing the gussets 50 as described above, the strength of the floor tunnel 10 is improved, making it possible to suppress deformation of the floor tunnel 10. In other words, the gussets 50 suppress deformation of the floor tunnel 10. Furthermore, the floor tunnel 10, which has improved strength, can withstand impact loads from the first floor cross member 20. At this time, the longitudinal bead portion 21b is arranged adjacent to the expanding surface portion 21e and the front and rear expanding wall portions 22c, 25c to which the floor tunnel 10 is connected, on the vehicle width direction outer side, so that stress is concentrated on the longitudinal bead portion 21b, which can promote deformation of the first floor cross member 20. Furthermore, since the expanding surface portion 21e and the like are arranged to overlap the ends of the gussets 50, narrowing of the interior space can be suppressed.

[0039] Next, the outer seat bracket 30 and the inner seat bracket 38 will be described. As shown in Figures 2 and 3, the outer seat bracket 30 and the inner seat bracket 38 are members for installing a vehicle seat, and for example, a slide member (not shown) for sliding the vehicle seat in the fore-and-aft direction of the vehicle is fixed to them. The outer seat bracket 30 of this embodiment is a box-shaped member having a rectangular upper surface and four side walls surrounding it, and is provided on the outer side of the first floor cross member 20 in the vehicle width direction.

[0040] The following describes the shape of the outer seat bracket 30. As shown in Figures 2 and 3, the outer seat bracket 30 has a bracket upper surface portion 31, a bracket front wall portion 32, a bracket rear wall portion 33, a bracket inner wall portion 34, and a bracket outer wall portion 35.

[0041] The bracket upper surface portion 31 is located on the upper portion of the outer seat bracket 30 and has a substantially rectangular flat surface facing upward of the vehicle. The bracket upper surface portion 31 is provided with a through hole or the like for installing a seat rail or the like, for example.

[0042] The bracket front wall 32 is a wall facing the front of the vehicle, and is inclined toward the front of the vehicle from the front end (front edge) of the bracket upper surface 31 toward the bottom of the vehicle. The bracket front wall 32 is also provided with a front opening 32a through which cables and the like can be inserted. The front opening 32a is formed by cutting out the outer and lower parts of the bracket front wall 32 in the vehicle width direction. The bracket front wall 32 is also provided with a front bracket flange 32b and a front outer bracket flange 32c.

[0043] The front bracket flange portion 32b protrudes forward of the vehicle from the vehicle width directional inner portion of the lower end of the bracket front wall portion 32, on the vehicle width directional inner side of the lower edge of the front opening 32a. The front bracket flange portion 32b is joined by spot welding or the like to the lower step portion 23g of the front lower member flange portion 23 of the first floor cross member 20. The front outer bracket flange portion 32c protrudes forward of the vehicle from the vehicle width directional outer end of the bracket front wall portion 32, on the vehicle width directional outer side of the upper edge of the front opening 32a. The front outer bracket flange portion 32c has a surface facing outward in the vehicle width direction, and this surface is joined to the inner wall portion 16a of the inner member 16 of the side sill 15 by spot welding or the like.

[0044] The bracket rear wall 33 is a wall facing the rear of the vehicle and is inclined rearward from the rear end (rear side) of the bracket upper surface 31 toward the bottom of the vehicle. The bracket rear wall 33 is provided with a rear opening 33a through which cables and the like can be inserted. The rear opening 33a is formed by cutting out the outer side and lower part of the bracket rear wall 33 in the vehicle width direction. The bracket rear wall 33 is also provided with a rear bracket flange 33b and a rear outer bracket flange 33c.

[0045] 2 and 3, the rear bracket flange portion 33b protrudes rearward from the vehicle width directional inner portion of the lower end of the bracket rear wall portion 33, on the vehicle width directional inner side of the lower edge of the rear opening 33a. The rear bracket flange portion 33b is joined by spot welding or the like to the lower step portion 26g of the rear lower member flange portion 26 of the first floor cross member 20. The rear outer bracket flange portion 33c protrudes rearward from the vehicle width directional outer end of the bracket rear wall portion 33, on the vehicle width directional outer side of the upper edge of the rear opening 33a. Like the front outer bracket flange portion 32c, the rear outer bracket flange portion 33c has a surface facing outward in the vehicle width direction, and this surface is joined to the inner wall portion 16a of the inner member 16 of the side sill 15 by spot welding or the like.

[0046] The bracket inner wall portion 34 is a wall portion facing the inside in the vehicle width direction and is inclined inward in the vehicle width direction from the inside end of the bracket upper surface portion 31 toward the bottom of the vehicle. The front end of the bracket inner wall portion 34 is connected to the inside end of the bracket front wall portion 32 in the vehicle width direction, forming a corner, and the rear end of the bracket inner wall portion 34 is connected to the inside end of the bracket rear wall portion 33 in the vehicle width direction, forming a corner. The bracket inner wall portion 34 is also provided with an inner bracket flange portion 34a. The inner bracket flange portion 34a protrudes inward in the vehicle width direction from a middle portion in the vehicle fore-and-aft direction of the lower end of the bracket inner wall portion 34 and is joined to the member upper surface portion 21 of the first floor cross member 20 by spot welding or the like. In this example, the inner bracket flange portion 34a is joined to the member upper surface portion 21 in a state where it overlaps the inside portion of the widthwise outer bead portion 21d in the vehicle width direction.

[0047] 2 and 3, the bracket outer wall portion 35 is a wall portion facing outward in the vehicle width direction and inclined inward in the vehicle width direction from the outer end of the bracket upper surface portion 31 in the vehicle width direction toward the bottom of the vehicle. The front end of the bracket outer wall portion 35 is connected to the outer end of the bracket front wall portion 32 in the vehicle width direction to form a corner, and the rear end of the bracket outer wall portion 35 is connected to the outer end of the bracket rear wall portion 33 in the vehicle width direction to form another corner. The bracket outer wall portion 35 is provided with an upper outer bracket flange portion 35a. The upper outer bracket flange portion 35a protrudes outward in the vehicle width direction from the lower end of the bracket outer wall portion 35 and is joined to the upper surface portion 16a of the inner member 16 of the side sill 15 by spot welding or the like.

[0048] In this embodiment, the upper outer bracket flange portion 35a, the front outer bracket flange portion 32c, and the rear outer bracket flange portion 33c of the outer seat bracket 30 are joined to the upper surface portion 16b and the inner wall portion 16a of the inner member 16 of the side sill 15, straddling a corner formed by the upper surface portion 16b and the inner wall portion 16a. In addition, the inner portion in the vehicle width direction at the upper end of the front opening 32a is curved downward of the vehicle.

[0049] In this embodiment, the front opening 32a and the rear opening 33a are arranged to overlap the convex shape of the first floor cross member 20 when viewed in the vehicle longitudinal direction. A cable (not shown) or the like routed on the inner side of the side sill 15 in the vehicle width direction is arranged along the upper part of the convex shape and passes through the front opening 32a and the rear opening 33a.

[0050] In addition, in this embodiment, the inclination angles of the front inclined wall portion 22a and the rear inclined wall portion 25a of the first floor cross member 20 are set to be smaller than the inclination angles of the bracket front wall portion 32 and the bracket rear wall portion 33 of the outer seat bracket 30. The inclination angles are the acute angles formed by the floor panel 1 and each of the front inclined wall portion 22a and the rear inclined wall portion 25a, and the acute angles formed by the floor panel 1 and each of the bracket front wall portion 32 and the bracket rear wall portion 33.

[0051] In this example, the outer edges of the front opening 32a and the rear opening 33a in the vehicle width direction face the inner wall 16a of the side sill 15. The member upper surface 21 is disposed below the vehicle relative to the upper ends of the opening edges of the front opening 32a and the rear opening 33a.

[0052] In this embodiment, the opening area of ​​the front opening 32a is set larger than the opening area of ​​the rear opening 33a. The upper end of the first floor cross member 20 is located lower than the upper end of the front opening 32a. The upper end of the rear opening 33a is located lower than the upper end of the front opening 32a and higher than the upper end of the first floor cross member 20.

[0053] In addition, in this embodiment, the position where the first floor cross member 20 is joined to the floor panel 1 and the side sill 15 is located further forward of the vehicle than the position where the outer seat bracket 30 is joined to the side sill 15, and the joining area where the front opening 32a is joined to the floor panel 1 and the side sill 15 is set larger than the joining area of ​​the rear opening 33a.

[0054] In addition, in the present embodiment, for example, the lower end of the front inclined wall portion 22a of the member front portion 22, which is positioned outward in the vehicle width direction from the bracket inner wall portion 34 of the outer seat bracket 30, is positioned further forward in the vehicle than the lower end of the front inclined wall portion 22a, which is positioned further inward in the vehicle width direction from the bracket inner wall portion 34. Similarly, the lower end of the rear inclined wall portion 25a of the member rear portion 25, which is positioned outward in the vehicle width direction from the bracket inner wall portion 34, is positioned further rearward in the vehicle than the lower end of the rear inclined wall portion 25a, which is positioned further inward in the vehicle width direction from the bracket inner wall portion 34. In this example, the lower end of the flared wall portion 22c of the member front portion 22 is positioned further forward in the vehicle than the lower end of the front inclined wall portion 22a, and the lower end of the flared wall portion 22c of the member rear portion 25 is positioned further rearward in the vehicle than the lower end of the rear inclined wall portion 25a.

[0055] Here, the inner seat bracket 38 will be described. The inner seat bracket 38 is disposed on the inner side of the first floor cross member 20 in the vehicle width direction, and in this example, is attached to the tunnel side wall 12. The upper surface of the inner seat bracket 38 is provided with through holes and the like for installing seat rails and the like. In addition, flanges are provided on the front and rear walls of the inner seat bracket 38, and the flanges are joined to the tunnel side wall 12 by spot welding or the like.

[0056] Furthermore, as described above, the floor portion structure of this embodiment has floor side members 14. The floor side members 14 are disposed on the outer side in the vehicle width direction on the underside of the floor panel 1, and extend at an inward angle in the vehicle width direction toward the front of the vehicle. The floor side members 14 extend at an incline as described above from the rear ends of the side sills 15, and are disposed so as to cross across the first floor cross member 20. Furthermore, the floor side members 14 in this example have a hat-shaped cross section, and flanges are provided on both sides. The flanges are joined to the underside of the floor panel 1 by spot welding or the like.

[0057] The floor side member 14, the first floor cross member 20, and the outer seat bracket 30 are arranged to overlap in the vertical direction of the vehicle. In this example, as shown in Fig. 5, the floor side member 14 is arranged to overlap the lower step portion 23g of the front lower member flange portion 23 of the first floor cross member 20. The outer seat bracket 30 is joined to the side sill 15 as described above.

[0058] In this structure, when an impact load is input from the vehicle width direction, the rigidity of the input side (the outer part in the vehicle width direction) of the first floor cross member 20 is improved, and stress concentration on the fore-and-aft bead portion 21b, which is a weak part of the first floor cross member 20, can be promoted.

[0059] Furthermore, because the outer seat bracket 30 is joined to the side sill 15, impact loads from the side (outside in the vehicle width direction) can be transmitted to the first floor cross member 20 via the outer seat bracket 30. This structure makes it possible to maintain the area into which the load of the first floor cross member 20 is input, thereby ensuring interior space.

[0060] As described above, the floor structure of this embodiment also has the second floor cross member 29. As shown in Figures 3 and 4, the second floor cross member 29 is disposed at a distance from the first floor cross member 20 on the vehicle front side, and is joined to the floor panel 1. In this example, the dimension of the first floor cross member 20 in the vehicle vertical direction is set smaller than the dimension of the second floor cross member 29 in the vehicle vertical direction.

[0061] Furthermore, the front and rear surfaces of the first floor cross member 20 are inclined so as to approach each other as they move from the floor panel 1 toward the member upper surface portion 21. In this example, the front inclined wall portion 22a of the member front portion 22 and the rear inclined wall portion 25a of the member rear portion 25 are inclined so as to approach each other as they move toward the member upper surface portion 21.

[0062] In contrast, the front and rear surfaces of the second floor cross member 29 extend almost perpendicular to the floor panel 1. In this example, the front and rear surfaces are slightly inclined so that they approach each other toward the upper surface. In other words, the front and rear surfaces of the first floor cross member 20 are gently inclined relative to the front and rear surfaces of the second floor cross member 29.

[0063] In this embodiment, a battery device 55 is installed on the upper surface of the floor panel 1 located between the first floor cross member 20 and the second floor cross member 29. The external shape of the battery device 55 is a substantially rectangular parallelepiped, and the outer side portion of the battery device 55 in the vehicle width direction is located above the floor side member 14.

[0064] The first floor cross member 20 is lower in the vehicle vertical direction than the second floor cross member 29, and therefore is designed to have lower strength. Therefore, the first floor cross member 20 is more easily deformed than the second floor cross member 29. In addition, the front inclined wall portion 22a and the rear inclined wall portion 25a of the first floor cross member 20 enable a wide cross section to absorb a side impact. Furthermore, the upper end of the first floor cross member 20 is located lower than the upper end of the second floor cross member 29, making it easier to ensure interior space. For example, if the first floor cross member 20 is located below the passenger seat, the feet of a rear seat occupant can be placed on the first floor cross member 20.

[0065] The description of the present embodiment is merely an example for explaining the present invention, and does not limit the invention described in the claims. Furthermore, the configuration of each part of the present invention is not limited to the above embodiment, and various modifications are possible within the technical scope described in the claims.

[0066] In this embodiment, the weakened portion provided on the member upper surface portion 21 is the longitudinal bead portion 21b, but is not limited to this. For example, the weakened portion may be formed by providing a plurality of through holes spaced apart from one another in the longitudinal direction of the vehicle. [Explanation of symbols]

[0067] 1 floor panel 2 Dash Panel 10 Floor Tunnel 11 Tunnel top 12 Tunnel side wall 13 Flange 14 Floor side member 15 Side sill 16 Inner member 16a Inner wall 16b Top part 16c Flange 17 Corner 18 Outer member 18a Outer wall 18b Top part 18c flange 20 First floor cross member (cross member) 21 Member upper surface (upper surface) 21a Straight section 21b Front-rear bead section (weak section) 21c Width direction inner bead 21d Outer bead in width direction 21e Spreading surface 22 Front of member 22a Front inclined wall (front wall) 22b Front vertical wall 22c Spreading wall 23 Front lower member flange 23e Step 23f Upper section 23g lower section 24a Front inner member flange 24b Front outer member flange 25 Rear of member 25a Rear inclined wall (rear wall) 25b Rear vertical wall 25c flared wall 26 Rear lower member flange 27a Rear inner member flange 27b Rear outer member flange 29 Second floor cross member 30 Outer seat bracket (seat bracket) 31 Upper surface of bracket 32 Bracket front wall 32a Front opening 32b Front bracket flange 32c Front outer bracket flange 33 Rear wall of bracket 33a Rear opening 33b Rear bracket flange 33c Rear outer bracket flange 34 Bracket inner wall 34a Inner bracket flange 35 Bracket outer wall 35a Upper outer bracket flange 38 Inner seat bracket 50 gusset 55 Battery device

Claims

1. A vehicle body floor structure comprising: a floor panel disposed on a floor portion of a vehicle body; a side sill provided on the outer side of the floor panel in the vehicle width direction and extending in the vehicle front-rear direction; and a floor tunnel provided in the middle of the floor panel in the vehicle width direction and extending in the vehicle front-rear direction while protruding from an upper surface of the floor panel above the vehicle, A cross member extending in the vehicle width direction is provided on the upper surface of the floor panel, one end of the cross member is joined to the side sill, and the other end is joined to the floor tunnel, The cross member has a convex cross section that protrudes upward from the vehicle, with front and rear wall surfaces that are inclined, and an upper surface that extends in the vehicle width direction is provided at an upper portion of the convex shape, The upper surface portion is provided with a weakened portion along the vehicle front-rear direction, The other end of the cross member widens in the vehicle front-rear direction as it moves from the weak portion toward the inside in the vehicle width direction.

2. A vehicle body floor structure comprising: a floor panel disposed on a floor portion of a vehicle body; a side sill provided on the outer side of the floor panel in the vehicle width direction and extending in the vehicle front-rear direction; and a floor tunnel provided in the middle of the floor panel in the vehicle width direction and extending in the vehicle front-rear direction while protruding from an upper surface of the floor panel above the vehicle, A cross member extending in the vehicle width direction is provided on the upper surface of the floor panel, one end of the cross member is joined to the side sill, and the other end is joined to the floor tunnel, The cross member has a convex cross section that protrudes upward from the vehicle, with front and rear wall surfaces that are inclined, and an upper surface that extends in the vehicle width direction is provided at an upper portion of the convex shape, The upper surface portion is provided with a weakened portion along the vehicle front-rear direction, a bead extending in the vehicle width direction is provided at a middle portion of the upper surface portion in the vehicle front-rear direction, A vehicle body floor structure, characterized in that the weak portion is located between the inner end of the bead in the vehicle width direction and the floor tunnel.

3. a battery device disposed on the floor panel located between the side sill and the floor tunnel and spaced apart from the cross member in the vehicle longitudinal direction; 3. The vehicle body floor structure according to claim 1, wherein the weak portion is disposed inward in the vehicle width direction from the center of the battery device in the vehicle width direction.

4. A vehicle floor structure as described in any one of claims 1 to 3, characterized in that the other end of the cross member is arranged overlapping a gusset provided on the back side of the floor panel when viewed from above.

5. A floor side member is provided on the underside of the floor panel, and a seat bracket on which a seat is installed is provided on an end of the cross member in the vehicle width direction. the floor side member, the cross member, and the seat bracket are arranged to overlap in the vehicle up-down direction, 5. The vehicle body floor structure according to claim 1, wherein the seat bracket positioned on the outer side in the vehicle width direction is joined to the side sill.

6. Another cross member is provided on the vehicle front side of the cross member at a distance, The dimension of the cross member in the vehicle vertical direction is set smaller than the dimension of the other cross member in the vehicle vertical direction, A vehicle floor structure as described in any one of claims 1 to 5, characterized in that the front and rear surfaces of the cross member are inclined so as to approach each other as they move from the floor panel toward the upper surface portion, and are gently inclined relative to the front and rear surfaces of the other cross member.

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