Vehicle body structure

Abstract

A vehicle body structure 1 has a battery case provided at a lower part of a vehicle 100. On an upper wall 12 of the battery case 10, a projection 14 projecting to the vehicle upper side Su is provided at a position corresponding to a front part 2a of a seat 2 of the vehicle 100, the projection 14 having a rib 17 as a reinforcement.

Description

Body structure

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

[0002] The vehicle described in Patent Document 1 has a service disconnector protective structure that protects the service disconnector disposed between the battery module disposed below the rear seat and the rear floor. The service disconnector protective structure has a load transmission part that transmits and distributes the weight of the occupant when a vehicle collision occurs and the submarine phenomenon occurs.

[0003] JP 2013-248969 A

[0004] However, in the vehicle described in Patent Document 1, if the load transmission portion is deformed, there is a possibility that the submarine phenomenon cannot be sufficiently suppressed.

[0005] The problem to be solved by the present invention is to provide a vehicle body structure that can suppress the submarine phenomenon.

[0006] The present invention solves the above problem by providing a protrusion that protrudes upward in the vehicle at a position on the upper wall of the battery case corresponding to the front portion of the seat, and the protrusion has a reinforcing member.

[0007] According to the present invention, the effect of suppressing the submarine phenomenon can be obtained.

[0008] Fig. 3 is a cross-sectional view showing the vehicle body structure according to the present embodiment. Fig. 4 is a cross-sectional perspective view of the protruding portion of the battery case and the floor panel side protruding portion of the vehicle body structure shown in Fig. 1, as seen from the lower side of the vehicle. Fig. 5 is a cross-sectional perspective view of the battery case of the vehicle body structure shown in Fig. 1, as seen from the upper side of the vehicle. Fig. 6 is a cross-sectional perspective view of a part of the battery case shown in Fig. 3, taken along the cutting line IV-IV. Fig. 7 is a cross-sectional view showing a state in which the floor panel side protruding portion is deformed in the vehicle body structure shown in Fig. 1.

[0009] Hereinafter, an embodiment of the present invention will be described with reference to the drawings. Fig. 1 shows a vehicle body structure 1 according to this embodiment. In Fig. 1, the right side is the vehicle rear side Sb, and the left side is the vehicle front side Sf. That is, the left-right direction in Fig. 1 is the vehicle fore-and-aft direction Dfb. In addition, the upper side in Fig. 1 is the vehicle upper side Su, and the lower side is the vehicle lower side Sd. That is, the up-down direction in Fig. 1 is the vehicle up-down direction Dud.

[0010] As shown in FIG. 1 , a vehicle body structure 1 for a vehicle 100 includes a battery case 10 provided at the bottom of the vehicle 100. The battery case 10 houses a battery. The battery case 10 includes an upper wall 12 (upper case) disposed on the vehicle upper side Su. An opening 12a is formed in the upper wall 12. The upper wall 12 also includes a lid 13 covering the opening 12a. The upper wall 12 and the lid 13 are formed by casting. Casting is used because it allows for flexibility in the shape of the upper wall 12 to conform to the shape of a floor panel 21 (described below), thereby increasing the internal capacity of the battery case 10 and enabling a protrusion 14 (described below) to be positioned as high up in the vehicle as possible (close to the floor panel 21). The battery case 10 is attached to a vehicle body 20 via an attachment portion 11. The vehicle body 20 also includes a floor panel 21 provided between the battery case 10 and a seat 2 on which an occupant X sits.

[0011] The lid portion 13 is provided with a protrusion 14 that protrudes toward the vehicle upper side Su at a position corresponding to the front portion 2a of the seat 2 of the vehicle 100. A rib 17 is formed on the lower surface of the upper end 14a of the protrusion 14. The rib 17 constitutes a reinforcing member. The lid portion 13 also has a rear protrusion 15 that is provided adjacent to the protrusion 14 on the vehicle rear side of the protrusion 14. The height of the rear protrusion 15 is lower than the height of the protrusion 14. A connector insertion hole 14d1 is formed in the rear side 14d of the protrusion 14 at a position higher than the rear protrusion 15, for inserting a connector therethrough. The protrusion 14 and the rear protrusion 15 are formed integrally as part of the lid portion 13. An SD switch 16 is attached to the front side 14b of the protrusion 14.

[0012] The floor panel 21 of the vehicle body 20 has a floor-panel-side protrusion 21a that protrudes toward the vehicle upper side Su at a position corresponding to the front portion 2a of the seat 2. That is, the floor-panel-side protrusion 21a is disposed on the vehicle upper side Su of the protrusion 14 of the battery case 10. In addition, in the vehicle front-rear direction Dfb, a position P01 of the rear end 14c of the protrusion 14 of the battery case 10 coincides with a position P02 of the rear end 21a1 of the floor-panel-side protrusion 21a. That is, the rear end 21a1 of the floor-panel-side protrusion 21a is disposed on the vehicle upper side Su of the rear end 14c of the protrusion 14 of the battery case 10. Note that this is not limited to the present embodiment, and the position P01 of the rear end 14c of the protrusion 14 of the battery case 10 may be located on the vehicle rear side Sb of the position P02 of the rear end 21a1 of the floor-panel-side protrusion 21a.

[0013] Next, the structure of the lid portion 13 will be described in more detail with reference to FIGS. 2 to 4. As shown in FIG. 2, the rib 17 of the protruding portion 14 of the lid portion 13 includes two first ribs 17a extending in the vehicle longitudinal direction Dfr and two second ribs 17b extending in the vehicle width direction Dw. The first ribs 17a and the second ribs 17b intersect with each other. That is, the rib 17 is a lattice-shaped reinforcing member composed of the first ribs 17a and the second ribs 17b. Note that the number of each of the first ribs 17a and the second ribs 17b is not limited to two, but may be one, three, or more. The first rib 17a constitutes a first reinforcing portion. The second rib 17b constitutes a second reinforcing portion. The vehicle width direction Dw is perpendicular to the vehicle longitudinal direction Dfr and the vehicle up-down direction Dud.

[0014] 3, in the vehicle front-rear direction Dfr, a position P3 of the rear end 13a of the lid portion 13 is located on the vehicle rear side Sr of an intermediate position P12 between the center position P1 of the protrusion 14 and the rear end position P2 of the battery case 10. In other words, the lid portion 13 extends further toward the vehicle rear side Sr than the intermediate position P12.

[0015] As shown in FIG. 3 , the protrusion 14 and the rear protrusion 15 are disposed along the edge of the lid 13 on the vehicle right side Rw. The lid 13 has a lid opening 13b formed on the vehicle left side Lw of the protrusion 14. The lid 13 has a second lid 18 that covers the lid opening 13b. The second lid 18 has a second protrusion 18a that protrudes toward the vehicle upper side Su and a third protrusion 18b that is provided adjacent to the second protrusion 18a on the vehicle left side Lw. The height of the upper end of the second protrusion 18a is the same as the height of the upper end 14a of the protrusion 14. The height of the upper end of the third protrusion 18b is lower than the height of the upper end of the second protrusion 18a.

[0016] 4, corners 14k1 and 14k2 of the first protrusion 14, corners 18k1 and 18k2 of the second protrusion 18a, and corner 18k3 of the third protrusion 18b are chamfered. As a result, even if the floor panel 21 is deformed toward the vehicle downward side Sd, the corners 14k1 and 14k2 of the first protrusion 14, corners 18k1 and 18k2 of the second protrusion 18a, and corner 18k3 of the third protrusion 18b abut against the floor panel 21, thereby preventing the floor panel 21 from sinking.

[0017] Next, the state of the floor panel 21 when it is deformed will be described with reference to Figure 5. For example, when the vehicle 100 is involved in a frontal collision, the body of the occupant X sitting in the seat 2 sinks toward the vehicle front side Sf and toward the vehicle lower side Sd, as shown by arrow A. As a result, the floor panel-side protrusion 21a deforms toward the vehicle lower side Sd, as shown in Figure 5. The rear end 21a1 of the floor panel-side protrusion 21a then abuts against the rear end 14c of the protrusion 14 of the battery case 10.

[0018] As described above, the upper wall 12 of the battery case 10 of the vehicle body structure 1 according to this embodiment is provided with a protrusion 14 that protrudes toward the vehicle upper side Su at a position corresponding to the front portion 2a of the seat 2 of the vehicle 100. The protrusion 14 includes a reinforcing member (rib 17). This increases the rigidity of the protrusion 14 with the reinforcing member compared to a case where the protrusion 14 does not include the reinforcing member. Therefore, as shown in FIG. 5 , even if the body of an occupant X seated in the seat 2 sinks toward the vehicle front side Sf and vehicle lower side Sd, deformation of the protrusion 14 is suppressed, and the protrusion 14 can support the body of the occupant X, thereby preventing the submarine phenomenon. The submarine phenomenon is a phenomenon in which the occupant X slides into the space under the occupant's feet when the vehicle 100 receives an impact due to a frontal collision or the like.

[0019] Furthermore, the upper wall 12 including the lid portion 13 is formed by casting, and the reinforcing member is a rib 17 formed integrally with the protrusion 14. This increases the rigidity of the protrusion 14 compared to when the protrusion 14 and the reinforcing member are made of different materials.

[0020] Furthermore, the rib 17 of the protrusion 14 has a first rib 17a extending in the vehicle fore-and-aft direction Dfb as a first reinforcing portion, which increases the rigidity of the protrusion 14 in the vehicle fore-and-aft direction Dfb, and allows the protrusion 14 to effectively support the body of the occupant X even when the body of the occupant X sitting in the seat 2 sinks toward the vehicle front side Sf and vehicle bottom side Sd.

[0021] Furthermore, the rib 17 of the protruding portion 14 has a second rib 17b as a second reinforcing portion that intersects with the first rib 17a and extends in the vehicle width direction Dw. As a result, the second rib 17b supports the first rib 17a, thereby further increasing the rigidity of the protruding portion 14.

[0022] Furthermore, the floor panel 21 of the vehicle body structure 1 has a floor-panel-side protrusion 21a that protrudes toward the vehicle upper side Su at a position corresponding to the front portion 2a of the seat 2, and the position of the rear end 14c of the protrusion 14 of the battery case 10 in the vehicle fore-and-aft direction Dfr coincides with the position of the rear end 21a1 of the floor-panel-side protrusion 21a. As a result, even if the floor-panel-side protrusion 21a deforms toward the vehicle lower side Sd, as shown in FIG. 5 , the rear end 21a1 of the floor-panel-side protrusion 21a abuts against the rear end 14c of the battery case 10, thereby suppressing deformation of the floor-panel-side protrusion 21a. Furthermore, without being limited to this embodiment, the position of the rear end 14c of the protrusion 14 of the battery case 10 may be further toward the vehicle rear side Sb than the position of the rear end 21a1 of the floor-panel-side protrusion 21a. In this case, when the floor panel side protrusion 21a is deformed toward the vehicle downward side Sd, the rear end 21a1 of the floor panel side protrusion 21a abuts against the upper end 14a of the protrusion 14 of the battery case 10, thereby suppressing deformation of the floor panel side protrusion 21a.

[0023] 3 , in the vehicle fore-and-aft direction Dfb, position P3 of the rear end 13a of the lid portion 13 where the protrusion 14 is provided is located further rearward Sr of the vehicle than an intermediate position P12 between the center position P1 of the protrusion 14 and the rear end position P2 of the battery case 10. As a result, the lid portion 13 where the protrusion 14 is provided extends further rearward Sr of the vehicle than the intermediate position P12, and therefore the rigidity of the lid portion 13 is higher than when the lid portion 13 does not extend further rearward Sr of the vehicle than the intermediate position P12.

[0024] The upper wall 12 also has a rearward protruding portion 15 provided adjacent to the protruding portion 14 on the vehicle rearward side Sb of the protruding portion 14, and the height of the rearward protruding portion 15 is lower than the height of the protruding portion 14. As a result, the rearward protruding portion 15 supports the protruding portion 14 from the vehicle rearward side Sb, thereby increasing the rigidity of the protruding portion 14.

[0025] In the present embodiment, the protrusion 14 is formed on the lid portion 13, but this is not limiting, and the upper wall 12 may not have the lid portion 13. That is, the protrusion 14 may be integrally formed on the upper wall 12 that does not have the lid portion 13. In addition, in FIG. 1 , the seat 2 is a rear seat, but this is not limiting, and the protrusion 14 and the floor panel-side protrusion 21 a may be provided at a position corresponding to a seat 2 other than the rear seat (for example, a front seat). In addition, the upper wall 12 is not limited to a casting. In addition, the reinforcing member is not limited to the rib 17 formed integrally with the protrusion 14, but may be a member fixed to the protrusion 14 by fastening or welding.

[0026] In the above description, the rib 17 corresponds to the reinforcing member, the first rib 17a corresponds to the first reinforcing portion, and the second rib 17b corresponds to the second reinforcing portion.

[0027] REFERENCE SIGNS LIST 100 vehicle 1 vehicle body structure 2 seat 10 battery case 12 upper wall 13 lid 14 protrusion 15 rear protrusion 17 reinforcing member 17a first reinforcing portion 17b second reinforcing portion 21 floor panel 21a floor panel side protrusion

Claims

1. A vehicle body structure having a battery case provided at the bottom of a vehicle, wherein an upper wall of the battery case is provided with a protrusion that protrudes upward from the vehicle at a position corresponding to the front portion of a seat of the vehicle, and the protrusion has a reinforcing member.

2. The vehicle body structure according to claim 1, wherein the upper wall is formed by casting, and the reinforcing member is a rib formed integrally with the protrusion.

3. A vehicle body structure according to claim 1 or 2, wherein the reinforcing member has a first reinforcing portion extending in the longitudinal direction of the vehicle.

4. The vehicle body structure according to claim 3, wherein the reinforcing member has a second reinforcing portion that intersects with the first reinforcing portion and extends in the vehicle width direction.

5. A vehicle body structure as claimed in any one of claims 1 to 4, further comprising a floor panel provided between the battery case and the seat, the floor panel having a floor panel side protrusion that protrudes upwardly of the vehicle at a position corresponding to the front portion of the seat, and the position of the rear end of the protrusion of the battery case in the fore-and-aft direction of the vehicle coincides with the position of the rear end of the floor panel side protrusion, or is at a position further rearward of the vehicle than the position of the rear end of the floor panel side protrusion.

6. A vehicle body structure as claimed in any one of claims 1 to 5, wherein the upper wall has a lid portion that covers an opening formed in the upper wall, the protrusion is provided on the lid portion, and in the longitudinal direction of the vehicle, the rear end of the lid portion is located rearward of the midpoint between the center position of the protrusion and the rear end position of the battery case.

7. A vehicle body structure as claimed in any one of claims 1 to 6, wherein the upper wall has a rearward protruding portion provided adjacent to the protruding portion on the vehicle rear side of the protruding portion, and the height of the rearward protruding portion is lower than the height of the protruding portion.

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