JP2018188124A - Vehicle lower structure - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a vehicle lower structure that is able to hinder inward break of a rocker while restricting a cost increase.SOLUTION: In a rocker 14, an outer part 22 and an inner part 24 are integrally formed. In comparison with a case where two panels, i.e., the outer part and the inner part, are connected, this eliminates the need for a process as of welding or fastening, so that a cost can be reduced by that amount. In addition, in an upper closed cross-section 36 of the rocker 14, an impact absorbing part 38 spans a part overlapping a floor cross member 18 in a vehicle side view between the outer part 22 and the inner part 24. In a lower closed cross-sectional part 34 of the rocker 14, an impact absorbing part 40 spans a part overlapping a battery pack 20 in a vehicle side view between the outer part 22 and the inner part 24. Therefore, when impact load F is input to the rocker 14 in the event of a side collision of the vehicle, each of the impact absorbing parts 38, 40 plastically deforms, and impact energy is absorbed. Accordingly, while a cost increase is restricted, inward break of the rocker 14 can be hindered.SELECTED DRAWING: Figure 2

Description

  The present invention relates to a vehicle lower structure.

  Patent Document 1 below discloses a technology related to a battery mounting structure for a vehicle that supports a battery unit, which is one of driving force supply devices, on the vehicle lower side of a floor panel. More specifically, in this prior art, a rectangular battery side frame is disposed between the rocker and the battery unit, and is provided adjacent to the rocker and the battery unit.

  On the other hand, when an impact load is input to the rocker due to a side collision of the vehicle and the rocker is deformed toward the inner side in the vehicle width direction (inner side of the rocker), a tensile force acts on the inner side of the rocker in the vehicle width direction. In the above prior art, as described above, since the battery side frame is provided adjacent to the rocker, a compression force acts on the rocker side of the battery side frame.

  That is, in the above prior art, in the rocker and the battery side frame, the stresses acting on each other cancel each other between the tensile force and the compressive force acting on the portions adjacent to each other. As a result, deformation of the rocker and the battery side frame is suppressed, and intrusion of the rocker into the vehicle width direction (so-called inward folding) is suppressed.

JP 2013-133046 A

  However, in general, the size of the battery unit varies depending on the vehicle. In the case of the above prior art, in order to suppress the internal folding of the rocker, it is necessary to change the size of the battery side frame in accordance with the size of the battery unit. . That is, there is a possibility that the cost increases because the versatility of the battery side frame itself is low.

  In view of the above facts, an object of the present invention is to obtain a vehicle lower structure capable of suppressing the internal folding of a rocker while suppressing an increase in cost.

  The vehicle lower structure according to the first aspect of the present invention includes a pair of rockers that are disposed on both outer sides of the vehicle floor panel in the vehicle width direction and extend along the vehicle longitudinal direction, and the floor panel. A storage battery disposed on the vehicle lower side of the vehicle, and the rocker is formed integrally with the outer portion located on the outer side in the vehicle width direction and on the inner side of the outer portion in the vehicle width direction. And an inner portion that forms a closed cross-section portion with the outer portion, and is disposed in the closed cross-section portion between the outer portion and the inner portion in the vehicle width direction so as to overlap the storage battery in a side view of the vehicle. And the first shock absorbing portion made.

  In the vehicle lower structure according to the first aspect of the present invention, rockers are respectively disposed on both outer sides of the vehicle floor panel in the vehicle width direction, and each rocker extends along the vehicle longitudinal direction. Yes. In addition, a storage battery is disposed on the lower side of the vehicle on the floor panel.

  Examples of the “storage battery” include a lithium ion battery, a nickel metal hydride battery, and a silicon battery. The “storage battery” here refers to a state in which a plurality of battery modules are accommodated in a case (hereinafter referred to as “battery pack”), for example.

  Here, in the rocker according to the present invention, an outer portion located on the outer side in the vehicle width direction and an inner portion located on the inner side in the vehicle width direction are integrally formed, and the outer section and the inner portion have a closed cross section. Forming part. Here, “integral formation” means that the outer portion and the inner portion are integrally formed by extrusion or drawing.

  In the present invention, in the rocker, the outer part and the inner part are integrally formed, for example, compared with the case where the rocker is formed by joining two panels of the outer part and the inner part. The rocker itself can be increased in rigidity.

  Further, when the rocker joins the two panels of the outer part and the inner part, welding, fastening or the like is required. However, in the present invention, the outer part and the inner part are integrally formed. Is unnecessary, and the cost can be reduced accordingly.

  Further, in the closed cross-section portion of the rocker, the first shock absorbing portion is bridged between the outer portion and the inner portion in the vehicle width direction, and the first shock absorbing portion is disposed at a position overlapping the battery pack in a vehicle side view. Is set to be.

  Generally, a battery pack to be mounted on a vehicle is set to have high rigidity. For this reason, in the present invention, the first shock absorbing portion of the rocker is disposed so as to overlap the battery pack in a side view of the vehicle, so that a part of the shock load input to the rocker at the time of a side collision of the vehicle 1 is transmitted to the battery pack side via the shock absorber.

  As described above, since the battery pack is set to have high rigidity, when a part of the impact load input to the rocker is transmitted to the battery pack, the rocker receives the reaction force from the battery pack. Get. As a result, the first shock absorbing portion of the rocker is plastically deformed and shock energy is absorbed. That is, the impact load can be reduced even with a short stroke.

  Thereby, the penetration | invasion (so-called inward folding) of the rocker to the inner side of the vehicle width direction can be suppressed. In other words, in the present invention, even when a large load is locally input to the rocker, such as a so-called pole-side collision, the rocker is prevented from being folded internally.

  As described above, according to the present invention, the first shock absorbing portion is provided in the closed cross-section portion of the rocker, and the first shock absorbing portion is disposed so as to overlap the battery pack as viewed from the side of the vehicle. By using the force, the internal folding of the rocker is suppressed. In other words, according to the present invention, it is possible to suppress the internal folding of the rocker without requiring a separate member as in the prior art. Further, according to the present invention, since it is possible to reduce the impact load even with a short stroke, it is possible to suppress the internal folding of the rocker regardless of the dimensions of the battery pack.

  According to a second aspect of the present invention, the vehicle lower structure according to the present invention is the vehicle lower structure according to the first aspect, wherein the vehicle lower structure is disposed between the pair of rockers on the floor panel and extends along the vehicle width direction. The rocker is further spanned in the vehicle width direction between the outer portion and the inner portion in the closed cross section, and overlaps the floor cross member in a vehicle side view. The second shock absorber is further included at the position.

  In the vehicle lower structure according to the second aspect of the present invention, the floor cross member is bridged along the vehicle width direction between the pair of rockers on the floor panel. Then, in the closed cross section of the rocker, the second impact absorbing portion is bridged in the vehicle width direction between the outer portion and the inner portion at a position overlapping the floor cross member in a vehicle side view.

  For this reason, at the time of a side collision of the vehicle, a part of the impact load input to the rocker is transmitted to the floor cross member side via the second impact absorbing portion. When an impact load is input to the floor cross member, the rocker moves away from the floor cross member (strictly speaking, the rocker on the side opposite to the rocker to which the impact load is input via the floor cross member). Gain power. As a result, the second impact absorbing portion is plastically deformed and the impact energy is absorbed. That is, in the present invention, impact energy can be further absorbed by plastic deformation of the first impact absorbing portion and the second impact absorbing portion.

  Here, in the event of a side collision of the vehicle, a load transmission path that is transmitted to the battery pack side through the first shock absorbing portion of the rocker and a transmission to the floor cross member side through the second shock absorbing portion of the rocker And a load transmission path to be formed. Therefore, it is possible to achieve load distribution in the impact load input to the rocker.

  That is, according to the present invention, the first shock absorbing portion and the second shock absorbing portion are provided in the closed cross-section portion of the rocker, and the first shock absorbing portion and the second shock absorbing portion are connected to the battery pack and the floor in a vehicle side view. Arrangement is made so as to overlap with the cross members, and the reaction force from the battery pack and the floor cross member is used to suppress the internal folding of the rocker.

  A vehicle lower structure according to a third aspect of the present invention is the vehicle lower structure according to the first or second aspect, wherein the storage battery includes a battery case that houses a plurality of battery modules, and the battery case includes Is provided with a first cross member that is bridged along the vehicle width direction at a position that overlaps with the first shock absorber in a side view of the vehicle.

  In the vehicle lower structure according to the third aspect of the present invention, the storage battery includes a battery case that accommodates a plurality of battery modules, and the first cross member extends along the vehicle width direction in the battery case. Has been passed. Thereby, the rigidity of battery case itself improves. And in this invention, this 1st cross member is set so that it may become a position which overlaps with a 1st shock absorption part by vehicle side view.

  Therefore, when an impact load is input to the rocker at the time of a side collision of the vehicle, the impact load is transmitted to the first cross member side of the battery case via the first impact absorbing portion. When the impact load is transmitted to the first cross member side of the battery case, the rocker moves to the first cross member (strictly speaking, the rocker to which the impact load is input through the first cross member and the battery case). The first impact absorbing portion is plastically deformed by obtaining a reaction force from the rocker on the opposite side of the first rocker. Thereby, the impact energy is absorbed, and the impact load can be reduced even with a short stroke.

  As described above, in the present invention, the first impact absorbing portion is provided in the closed cross-section portion of the rocker, and the position of the first cross member of the battery case is set so as to overlap the first impact absorbing portion in a vehicle side view. As a result, the reaction force from the first cross member can be used effectively, and the rocker can be prevented from bending.

  A vehicle lower structure according to a fourth aspect of the present invention is the vehicle lower structure according to the third aspect, wherein the first shock absorbing portion includes a first lateral wall that is spanned in the vehicle width direction. The first cross member includes a second lateral wall that overlaps the first lateral wall spanned in the vehicle width direction in a vehicle side view.

  In the vehicle lower structure according to the fourth aspect of the present invention, the first impact absorbing portion is configured to include a first lateral wall spanned in the vehicle width direction, and the first cross member is configured in the vehicle width direction. It is comprised including the 2nd horizontal wall spanned over.

  In the present invention, the second lateral wall of the first cross member is set so as to overlap the first lateral wall of the first shock absorber in a side view of the vehicle. As a result, when an impact load is input to the rocker during a side collision of the vehicle, the impact load is transmitted to the second lateral wall side of the first cross member of the battery case via the first lateral wall of the first impact absorbing portion. The

  As described above, in the present invention, the second lateral wall constituting at least part of the first cross member of the battery case is the vehicle side surface with respect to the first lateral wall constituting at least part of the first shock absorbing portion of the rocker. By arranging so as to overlap with each other, a reaction force from the first cross member can be effectively obtained.

  According to a fifth aspect of the present invention, a vehicle lower structure according to the present invention includes a pair of rockers disposed on both outer sides of the vehicle floor panel in the vehicle width direction and extending along the vehicle front-rear direction, and the floor panel. And a floor cross member disposed between the pair of rockers and spanned along the vehicle width direction, wherein the rocker includes an outer portion located outside the vehicle width direction, and the outer portion. An inner portion that is integrally formed and is located inside the outer portion in the vehicle width direction and forms a closed section with the outer portion, and a vehicle width direction between the outer portion and the inner portion in the closed section And a third shock absorbing portion disposed at a position overlapping the floor cross member in a side view of the vehicle.

  In the vehicle lower structure according to the fifth aspect of the present invention, rockers are respectively disposed on both outer sides of the vehicle floor panel in the vehicle width direction, and each rocker extends along the vehicle front-rear direction. Yes. Further, on the floor panel, a floor cross member is bridged along the vehicle width direction between the pair of rockers.

  Here, in the rocker according to the present invention, an outer portion located on the outer side in the vehicle width direction and an inner portion located on the inner side in the vehicle width direction are integrally formed, and the outer section and the inner portion have a closed cross section. Forming part. In this way, in the rocker, the outer part and the inner part are integrally formed, so that, for example, the rocker itself is compared with the case where the rocker is formed by joining two panels of the outer part and the inner part. The rigidity of can be increased.

  Further, in the closed cross section of the rocker, a third impact absorbing portion is bridged in the vehicle width direction between the outer portion and the inner portion at a position overlapping the floor cross member in a vehicle side view. For this reason, when an impact load is input to the rocker at the time of a side collision of the vehicle, a part of the impact load is transmitted to the floor cross member side via the third impact absorbing portion.

  In this way, when a part of the impact load is transmitted to the floor cross member side, the rocker becomes the floor cross member (strictly speaking, through the floor cross member, the side opposite to the rocker to which the impact load is input). The third shock absorbing portion is plastically deformed by obtaining a reaction force from the rocker. Thereby, impact energy is absorbed. That is, the impact load can be reduced even with a short stroke.

  As described above, in the present invention, the third shock absorbing portion is provided in the closed cross-section portion of the rocker, and the third shock absorbing portion is disposed so as to overlap the floor cross member in a vehicle side view. By using the reaction force of the rocker, the internal folding of the rocker is suppressed.

  The vehicle lower structure according to the present invention described in claim 6 is the vehicle lower structure according to the present invention described in claim 5, wherein a fuel cell is disposed on the vehicle lower side of the floor panel.

  As described above, in the vehicle lower structure according to the present invention described in claim 6, when the vehicle collides, the impact load input to the rocker is transmitted to the floor cross member disposed on the floor panel. . For this reason, in the vehicle lower structure according to the present invention as set forth in claim 4, a fuel cell is disposed on the vehicle lower side of the floor panel. Thereby, it is possible to prevent an impact load from being input to the fuel cell side disposed on the vehicle lower side of the floor panel. Examples of the raw material for the “fuel cell” include hydrogen and alcohol.

  The vehicle lower structure according to the present invention described in claim 7 is the vehicle lower structure according to claim 5 or 6, wherein the floor panel has a central portion in the vehicle width direction toward the vehicle interior side. A tunnel portion that protrudes toward the vehicle and extends in the vehicle front-rear direction is provided, and the floor cross member is bridged between the pair of rockers with the tunnel portion interposed therebetween.

  In the vehicle lower structure according to the seventh aspect of the present invention, a tunnel portion that protrudes toward the vehicle interior side and extends along the vehicle front-rear direction is provided at the center portion of the floor panel in the vehicle width direction. ing.

  Here, in “the floor cross member is spanned in the vehicle width direction between the pair of rockers with the tunnel portion in between”, the floor cross member is formed along the shape of the tunnel portion. In addition to the case where one is provided along the width direction, the case where two are provided along the vehicle width direction by being divided by the tunnel portion is also included.

  In the former case, both ends of the floor cross member in the longitudinal direction are coupled to rockers on both ends of the floor panel in the vehicle width direction. For this reason, the rocker to which the impact load is input receives a reaction force from the rocker on the opposite side to the rocker to which the impact load is input, by the transmission load transmitted to the floor cross member via the rocker.

  On the other hand, in the latter case, one end in the longitudinal direction of the floor cross member is coupled to the rocker on one end side in the vehicle width direction of the floor panel, and the other end in the longitudinal direction of the floor cross member is coupled to the tunnel portion. For this reason, the rocker to which the impact load is input is configured to obtain a reaction force from the tunnel portion by the transmission load transmitted to the floor cross member via the rocker. Therefore, in this case, for example, it is desirable to increase the rigidity of the tunnel part itself by disposing a reinforcing member in the tunnel part.

  As described above, in the present invention, the impact load can be effectively reduced even with a short stroke, so that a large-capacity fuel cell can be disposed on the vehicle lower side of the tunnel portion. Become.

  The vehicle lower structure according to the present invention described in claim 8 is provided with a pair of rockers disposed on both outer sides of the vehicle floor panel in the vehicle width direction and extending along the vehicle longitudinal direction, and the vehicle floor. And a fuel cell disposed on the vehicle lower side of the panel, wherein the rocker is integrally formed with an outer portion located on the outer side in the vehicle width direction and the outer portion, and the inner side of the outer portion in the vehicle width direction. An inner portion that forms a closed cross-section portion with the outer portion, and a fourth shock absorbing portion that is spanned in the vehicle width direction between the outer portion and the inner portion within the closed cross-section portion. The fuel cell includes a tank case in which fuel tanks arranged along the vehicle width direction are arranged along the vehicle longitudinal direction, and the tank case is adjacent to the vehicle longitudinal direction. Between arranged fuel tanks The second cross member that spans along the vehicle width direction at a position overlapping with the fourth shock absorbing portion when viewed from the side of the vehicle is provided with partitions.

  In the vehicle lower structure according to the eighth aspect of the present invention, rockers are respectively disposed on both outer sides of the vehicle floor panel in the vehicle width direction, and each rocker extends along the vehicle front-rear direction. Yes. A fuel cell is disposed on the vehicle lower side of the vehicle floor panel.

  Here, in the rocker according to the present invention, an outer portion located on the outer side in the vehicle width direction and an inner portion located on the inner side in the vehicle width direction are integrally formed, and the outer section and the inner portion have a closed cross section. Forming part. In this way, in the rocker, the outer part and the inner part are integrally formed, so that, for example, the rocker itself is compared with the case where the rocker is formed by joining two panels of the outer part and the inner part. The rigidity of can be increased. Further, in the closed cross section of the rocker, a fourth shock absorber is bridged between the outer part and the inner part in the vehicle width direction.

  On the other hand, the fuel cell according to the present invention includes a tank case in which fuel tanks arranged along the vehicle width direction are arranged along the vehicle front-rear direction. In this tank case, the 2nd cross member is spanned along the vehicle width direction, and the fuel tank arrange | positioned adjacent to the vehicle front-back direction is divided by the said 2nd cross member. Thus, by providing the second cross member in the tank case, the rigidity of the tank case itself is improved.

  And in this invention, this 2nd cross member is set so that it may become a position which overlaps with a 4th shock absorption part by vehicle side view. For this reason, when an impact load is input to the rocker during a side collision of the vehicle, the impact load is transmitted to the second cross member side of the tank case via the fourth impact absorbing portion.

  When the impact load is transmitted to the second cross member side of the tank case, the rocker receives the impact load via the second cross member (strictly speaking, the second cross member and the tank case). By obtaining a reaction force from the rocker on the side opposite to the rocker), the fourth shock absorber is plastically deformed. Thereby, the impact energy is absorbed, and the impact load can be reduced even with a short stroke.

  As described above, in the present invention, the fourth shock absorbing portion is provided in the closed cross section of the rocker, and the position of the second cross member of the tank case is set so as to overlap the fourth shock absorbing portion in a side view of the vehicle. Thus, the reaction force from the second cross member can be used, and the internal folding of the rocker can be suppressed.

  A vehicle lower structure according to a ninth aspect of the present invention is the vehicle lower structure according to the eighth aspect of the present invention, wherein the fourth shock absorbing portion includes a third lateral wall that extends across the vehicle width direction. The second cross member includes a fourth lateral wall that overlaps the third lateral wall spanned in the vehicle width direction in a vehicle side view.

  In the vehicle lower structure according to the ninth aspect of the present invention, the fourth impact absorbing portion is configured to include a third lateral wall spanned in the vehicle width direction, and the second cross member is configured in the vehicle width direction. It is comprised including the 4th horizontal wall spanned over.

  In the present invention, the fourth lateral wall of the second cross member is set so as to overlap with the third lateral wall of the fourth shock absorber in a vehicle side view. Thus, when an impact load is input to the rocker at the time of a side collision of the vehicle, the impact load is transmitted to the fourth lateral wall side of the second cross member of the tank case via the third lateral wall of the fourth impact absorbing portion. The

  As described above, in the present invention, the fourth lateral wall constituting at least a part of the second cross member of the tank case is the vehicle side surface with respect to the third lateral wall constituting at least a part of the fourth shock absorbing portion of the rocker. By arranging so as to overlap with each other, reaction force from the second cross member can be effectively obtained.

  A vehicle lower structure according to a tenth aspect of the present invention is the vehicle lower structure according to the eighth or ninth aspect, wherein the vehicle lower structure is disposed between the pair of rockers on the floor panel and extends in the vehicle width direction. And the floor cross member spanned between the outer portion and the inner portion in the closed cross-section portion of the rocker, and is disposed at a position overlapping the floor cross member in a side view of the vehicle. And a fifth shock absorber.

  In the lower vehicle structure according to the tenth aspect of the present invention, the floor cross member is bridged along the vehicle width direction between the pair of rockers on the floor panel. And in the closed cross-section part of a rocker, the 5th shock-absorbing part is spanned between the outer part and the inner part at the position which overlaps with a floor cross member by the vehicle side view.

  For this reason, at the time of a side collision of the vehicle, a part of the impact load input to the rocker is transmitted to the floor cross member side via the fifth impact absorbing portion. When an impact load is input to the floor cross member, the rocker moves away from the floor cross member (strictly speaking, the rocker on the side opposite to the rocker to which the impact load is input via the floor cross member). Gain power. As a result, the fifth impact absorbing portion is plastically deformed and the impact energy is absorbed. That is, in the present invention, the impact energy can be further absorbed by the plastic deformation of the fourth shock absorber and the fifth shock absorber.

  Here, in the event of a side collision of the vehicle, the load transmission path is transmitted to the battery pack side via the fourth shock absorbing portion of the rocker, and is transmitted to the floor cross member side via the fifth shock absorbing portion of the rocker. And a load transmission path to be formed. Therefore, it is possible to achieve load distribution in the impact load input to the rocker.

  In other words, according to the present invention, the fourth shock absorbing portion and the fifth shock absorbing portion are provided in the closed cross-section portion of the rocker, and the fourth shock absorbing portion and the fifth shock absorbing portion are connected to the fuel tank and the floor cloth in a vehicle side view. Arrangement is made so as to overlap with the members, and the reaction force from the fuel tank and the floor cross member is used to suppress the internal folding of the rocker.

  As described above, the vehicle lower structure according to the first aspect of the present invention has an excellent effect of suppressing the internal folding of the rocker while suppressing an increase in cost.

  The vehicle lower structure according to the second aspect of the present invention has an excellent effect that the impact load can be effectively reduced even with a short stroke.

  The vehicle lower structure according to the third aspect of the present invention has an excellent effect that the internal folding of the rocker can be suppressed using the reaction force from the first cross member.

  The vehicle lower structure according to the fourth aspect of the present invention has an excellent effect that the impact load can be effectively reduced even with a short stroke.

  According to the fifth aspect of the present invention, the vehicle lower structure according to the present invention has an excellent effect that the rocker can be prevented from being folded while suppressing an increase in cost.

  The vehicle lower structure according to the sixth aspect of the present invention has an excellent effect that the impact load can be prevented from being transmitted to the fuel cell.

  The vehicle lower structure according to the seventh aspect of the present invention has an excellent effect that a large-capacity fuel cell can be disposed.

  The vehicle lower structure according to the eighth aspect of the present invention has an excellent effect that the internal folding of the rocker can be suppressed using the reaction force from the second cross member.

  The vehicle lower structure according to the ninth aspect of the present invention has an excellent effect that the impact load can be effectively reduced even with a short stroke.

  The vehicle lower structure according to the present invention described in claim 10 is excellent in that the impact load can be effectively reduced even by a short stroke by further utilizing the reaction force from the floor cross member. Has an effect.

It is a top view of the vehicle lower part with which the vehicle lower part structure concerning 1st Embodiment was applied. FIG. 2 is a cross-sectional view taken along line 2-2 in FIG. It is sectional drawing corresponding to FIG. 2 which shows the modification of the vehicle lower part structure which concerns on 1st Embodiment. It is sectional drawing corresponding to FIG. 2 which shows the vehicle lower part structure concerning 2nd Embodiment. It is sectional drawing corresponding to FIG. 2 which shows the 1st modification of the vehicle lower part structure concerning 2nd Embodiment. It is sectional drawing corresponding to FIG. 2 which shows the 2nd modification of the vehicle lower part structure which concerns on 2nd Embodiment. It is a disassembled perspective view which shows the vehicle lower part and battery pack to which the vehicle lower part structure concerning 3rd Embodiment was applied. It is sectional drawing when cut | disconnecting along 8-8 line of the battery pack including the vehicle lower part shown in FIG. It is a perspective view of the fuel cell mounted in the vehicle lower part with which the vehicle lower part structure concerning 4th Embodiment was applied. FIG. 10 is a cross-sectional view taken along line 10-10 in FIG. 9 including the vehicle lower portion shown in FIG. 7.

  A vehicle lower structure according to an embodiment of the present invention will be described with reference to the drawings. In addition, arrow FR, arrow UP, and arrow RH described appropriately in each figure respectively indicate the front direction, the upward direction, and the right direction of the vehicle to which the vehicle floor structure according to the embodiment of the present invention is applied. . Hereinafter, when simply using the front-rear, up-down, left-right directions, the front-rear direction in the vehicle front-rear direction, the up-down direction in the vehicle up-down direction, and the left-right direction when facing forward are indicated unless otherwise specified.

<First Embodiment>
(Structure of the vehicle lower structure)

  First, the configuration of the vehicle lower structure according to the present embodiment will be described. FIG. 1 is a plan view of a vehicle lower part 10 to which the vehicle lower part structure according to the present embodiment is applied. FIG. 2 is a cross-sectional view taken along line 2-2 in FIG. The figure is shown.

  As shown in FIG. 1, a floor panel 12 extends in the vehicle lower portion 10 along the vehicle width direction and the vehicle front-rear direction. The floor panel 12 is provided with intermittently protruding bead portions 12A along the vehicle longitudinal direction, and a plurality of the bead portions 12A are arranged along the vehicle width direction. By forming the bead portion 12A, the rigidity of the floor panel 12 itself is improved.

  Rockers 14 and 16 extend along the vehicle front-rear direction at both ends in the vehicle width direction of the floor panel 12, and the vehicle on the floor panel 12 is between the rocker 14 and the rocker 16. A floor cross member 18 is bridged along the width direction. In addition, the floor cross member 18 is arrange | positioned between the bead part 12A and the bead part 12A arrange | positioned along the vehicle front-back direction.

  As shown in FIG. 2, on the lower side of the floor panel 12, as a driving force supply device for supplying power to a power unit such as a motor, a battery pack composed of a lithium ion battery, a nickel hydrogen battery or the like ( Storage battery) 20 is provided.

  As described above, the rockers 14 and 16 extend along the vehicle longitudinal direction at both ends of the floor panel 12 in the vehicle width direction. The rockers 14 and 16 will be described below. The rocker 16 has substantially the same configuration as the rocker 14 and will not be described.

  As shown in FIG. 2, in the present embodiment, the rocker 14 is configured to include an outer portion 22 positioned on the outer side in the vehicle width direction and an inner portion 24 positioned on the inner side in the vehicle width direction. . The rocker 14 is formed of, for example, a metal such as an aluminum alloy, and the outer portion 22 and the inner portion 24 are integrally formed by extrusion processing, drawing processing, or the like, and the outer cross-section portion is closed by the outer portion 22 and the inner portion 24. 26 is formed.

  The outer portion 22 has a cross-sectional shape cut along the vehicle width direction, an outer wall portion 22A formed along the vertical direction, and an upper side of the outer wall portion 22A. An inclined upper wall portion 22B that inclines toward the side, and an inclined lower wall portion 22C that is provided on the lower side of the outer wall portion 22A and inclines downward as it goes inward in the vehicle width direction. ing.

  On the other hand, the inner portion 24 has a cross-sectional shape cut along the vehicle width direction, and an upper inner wall portion 24A formed along the vertical direction on the upper side of the inner portion 24 and a vehicle upper and lower side on the lower side of the inner portion 24. And a lower inner wall portion 24B formed along the direction. The lower inner wall portion 24B is located on the inner side in the vehicle width direction with respect to the upper inner wall portion 24A, and a horizontal wall portion formed along a substantially horizontal direction between the lower inner wall portion 24B and the upper inner wall portion 24A. 24C is provided. Therefore, the lateral wall portion 24C is formed so as to be connected to the upper inner wall portion 24A and the lower inner wall portion 24B.

  Further, on the upper side of the upper inner wall portion 24A, an inclined upper wall portion 24D that is inclined upward as it goes outward in the vehicle width direction is provided. It is formed so as to be connected to the inclined upper wall portion 22B. A flange portion 28 extends upward from a top portion 27 where the inclined upper wall portion 24D of the inner portion 24 and the inclined upper wall portion 22B of the outer portion 22 are connected. Note that a lower end portion of a pillar (not shown) is coupled to the flange portion 28.

  Further, a bottom wall portion 24E formed along a substantially horizontal direction toward the outside in the vehicle width direction is provided on the lower side of the lower inner wall portion 24B, and the bottom wall portion 24E corresponds to the outer portion 22. It is formed so as to be connected to the inclined lower wall portion 22C. A fastener 32 can be inserted into the bottom wall portion 24 </ b> E, and a fixing piece 30 provided in the battery pack 20 can be fastened and fixed to the rocker 14 via the fastener 32.

  As described above, the upper inner wall portion 24A of the inner portion 24 is located outside the lower inner wall portion 24B in the vehicle width direction. As a result, the area of the closed cross section differs between the upper portion 14A and the lower portion 14B of the rocker 14. That is, the area of the lower closed cross-section portion 34 provided on the lower portion 14B side of the rocker 14 is larger than the area of the upper closed cross-section portion 36 provided on the upper portion 14A side of the rocker 14. The rigidity is set to be higher on the lower 14B side of the rocker 14 than on the upper 14A side.

  A ladder-like impact absorbing portion (second impact absorbing portion) 38 is provided in the upper closed cross-section portion 36 of the rocker 14, and the impact absorbing portion 38 is connected to the floor cross member 18 in a side view of the vehicle. They are arranged so as to overlap. Further, a ladder-like impact absorbing portion (first impact absorbing portion) 40 is formed in the lower closed cross-section portion 34 of the rocker 14, and the impact absorbing portion 40 overlaps the battery pack 20 in a side view of the vehicle. Are arranged as follows.

Here, each of the impact absorbing portions 38 and 40 will be described.
The shock absorbing portion 38 includes an upper wall 38A that extends between the upper inner wall portion 24A of the inner portion 24 and the outer wall portion 22A of the outer portion 22 along a substantially horizontal direction (vehicle width direction). A lower wall 38B is formed on the lower side of the upper wall 38A so as to face the upper wall 38A. The lower wall 38B is connected to the lateral wall portion 24C and defines the upper portion 14A and the lower portion 14B of the rocker 14. ing. For this reason, the lower wall 38B is also referred to as a “compartment wall”. In addition, a plurality (two in this case) of connecting walls 38C are bridged in the vertical direction between the upper wall 38A and the lower wall 38B.

  On the other hand, the impact absorbing portion 40 includes an upper wall 40A that extends between the lower inner wall portion 24B of the inner portion 24 and the outer wall portion 22A of the outer portion 22 along a substantially horizontal direction (vehicle width direction). . A lower wall 40B is formed on the lower side of the upper wall 40A so as to face the upper wall 40A, and a plurality (three in this case) of connecting walls 40C are provided between the upper wall 40A and the lower wall 40B. It is stretched up and down.

(Operation and effect of the vehicle substructure)
Next, functions and effects of the vehicle lower structure according to the present embodiment will be described.

  As shown in FIG. 2, in this embodiment, in the rocker 14, the outer part 22 and the inner part 24 are integrally formed, and the outer part 22 and the inner part 24 form a closed cross-sectional part 26. Yes.

  Thereby, for example, although not shown, the rocker 14 itself can be more rigid than the case where the rocker is formed by joining two panels of an outer part and an inner part. Further, when the rocker joins the two panels of the outer part and the inner part, welding or fastening is required, but in this embodiment, since the outer part 22 and the inner part 24 are integrally formed, These processes are unnecessary, and the cost can be reduced accordingly.

  Further, in the present embodiment, in the upper portion 14A (in the upper closed cross-section portion 36) of the rocker 14, the shock absorbing portion 38 is located between the outer portion 22 and the inner portion 24 at a position overlapping the floor cross member 18 in a vehicle side view. It is bridged in the vehicle width direction. Further, in the lower part 14B of the rocker 14 (in the lower closed cross section 34), the shock absorbing part 40 is bridged in the vehicle width direction between the outer part 22 and the inner part 24 at a position overlapping the battery pack 20 in a vehicle side view. Has been.

  For this reason, when the impact load F is input to the rocker 14 at the time of a side collision of the vehicle, a part of the impact load F input to the rocker 14 is provided to the impact absorbing portion 38 provided on the upper portion 14A side of the rocker 14. Is transmitted to the floor cross member 18 side (transmission load F1), and is transmitted to the battery pack 20 side via the impact absorbing portion 40 provided on the lower portion 14B side of the rocker 14 (transmission load F2).

  When the transmission load F1 is transmitted to the floor cross member 18 via the shock absorbing portion 38, the rocker 14 receives the floor load member 18 (strictly speaking, the shock load F is input through the floor cross member 18). A reaction force N1 is obtained from the rocker 16 (see FIG. 1) opposite to the rocker 14. Further, when the transmission load F2 is transmitted to the battery pack 20 via the shock absorber 40, the rocker 14 is connected to the battery pack 20 (strictly speaking, the rocker 14 to which the impact load F is input via the battery pack 20). The reaction force N2 is obtained from the opposite rocker 16 (see FIG. 1). Thereby, each of the impact absorbing portions 38 and 40 is plastically deformed and the impact energy is absorbed.

  Therefore, in this embodiment, it is possible to reduce the impact load F even with a short stroke. For this reason, although not shown, for example, even when a large load is locally input to the rocker 14 like a pole side collision, it is possible to suppress the internal folding of the rocker 14. . That is, according to the present embodiment, it is possible to suppress the internal folding of the rocker 14 while suppressing an increase in cost.

  By the way, in this embodiment, as described above, when the impact load F is input to the rocker 14 at the time of a side collision of the vehicle, a part of the impact load F is provided on the upper portion 14A side of the rocker 14. It is transmitted to the floor cross member 18 side via the shock absorber 38 (transmission load F1) and transmitted to the battery pack 20 side via the shock absorber 40 provided on the lower part 14B side of the rocker 14 (transmission). Load F2).

  That is, here, the load transmission path A transmitted to the floor cross member 18 side through the shock absorbing portion 38 of the rocker 14 and the load transmission transmitted to the battery pack 20 side through the shock absorbing portion 40 of the rocker 14. A path B is formed. As a result, it is possible to achieve load distribution in the impact load F input to the rocker 14, and it is also possible to change the ratio of the load burden between the upper part 14 </ b> A of the rocker 14 and the lower part 14 </ b> B of the rocker 14.

  For this reason, the transmission load F2 transmitted to the battery pack 20 side disposed on the lower side of the floor panel 12 can be reduced. According to this, for example, the rigidity of the battery pack 20 itself can be reduced by the amount that the transmission load F2 transmitted to the battery pack 20 side is reduced. In this case, the battery pack 20 can be reduced in thickness to reduce the weight of the battery pack 20. Moreover, the mounting amount of the battery module 20 </ b> A accommodated in the battery pack 20 can be increased as much as the thickness of the battery pack 20 is reduced.

(Supplementary items of this embodiment)
In the present embodiment, the impact absorbing portions 38 and 40 may be formed integrally with the rocker 14 or may be formed separately. When the shock absorbers 38 and 40 are formed separately from the rocker 14, the shock absorbers 38 and 40 can be formed of a material different from that of the rocker 14. Will improve.

  Moreover, in this embodiment, although the impact-absorbing part 38 and the impact-absorbing part 40 are each formed in the shape of a ladder, the shape of the impact-absorbing part 38 and the impact-absorbing part 40 is not restricted to this. For example, the shape can be appropriately changed in relation to the plate thickness, for example, the plate thickness is reduced to form a honeycomb shape. Further, the plate thickness may be changed between the shock absorbing portion 38 and the shock absorbing portion 40, and the shock absorbing portion 38 and the shock absorbing portion 40 do not necessarily have the same shape.

  As described above, in the present embodiment, the rocker 14 is provided with the impact absorbing portion 38 at a position overlapping the floor cross member 18 when viewed from the side of the vehicle, and absorbs shock at a position overlapping the battery pack 20 when viewed from the side of the vehicle. Although the section 40 is provided, the embodiment applied in the present invention is not limited to this.

  For example, as shown in FIG. 3, depending on the vehicle, there is a vehicle type in which the floor cross member 18 (see FIG. 2) is not provided on the floor panel 12. In this case, the shock absorber 38 (see FIG. 2) is not provided on the upper part 42A side of the rocker 42 that overlaps the floor cross member 18 (see FIG. 2) in a side view of the vehicle, but the shock absorber 38 absorbs shock on the lower part 42B side of the rocker 42. A portion 40 is provided. For this reason, when the impact load F is input to the rocker 14 at the time of a side collision of the vehicle, a part of the impact load F is transmitted to the battery pack 20 side via the impact absorbing portion 40 (transmission load F3). .

  When an impact load (transmission load F3) is transmitted to the battery pack 20 via the impact absorbing portion 40, the rocker 14 obtains a reaction force N3 from the battery pack 20. Thereby, since the impact absorbing portion 40 is plastically deformed, the impact energy is absorbed even in this case.

Second Embodiment
In the first embodiment, the case where the battery pack 20 (see FIG. 2) is used as a driving force supply device for supplying power to the power unit has been described. However, in the present embodiment, as shown in FIG. A case where a hydrogen tank (fuel cell) 44 is used as the driving force supply device will be described. In addition, description is abbreviate | omitted about the structure substantially the same as 1st Embodiment.

  As shown in FIG. 4, in the present embodiment, the shock absorber 38 is provided in a position where the rocker 46 does not overlap with the hydrogen tank 44 in the vehicle side view (upper 46 </ b> A side of the rocker 46).

  In this case, when the impact load F is inputted to the rocker 46 at the time of a side collision of the vehicle, a part of the impact load F is passed through the floor crossing via the impact absorbing portion 38 provided on the upper portion 46A side of the rocker 46. It is transmitted to the member 18 side (transmission load F4). When the transmission load F <b> 4 is transmitted to the floor cross member 18 through the impact absorbing portion 38, the rocker 46 obtains a reaction force N <b> 4 from the floor cross member 18. Thereby, the impact absorbing portion 38 is plastically deformed and the impact energy is absorbed.

  Therefore, according to the present embodiment, the impact load F can be reduced even with a short stroke, and the intrusion of the rocker 46 into the vehicle width direction can be suppressed. In the present embodiment, it is possible to prevent the impact load F from being input to the hydrogen tank 44 disposed on the lower side of the floor panel 12.

(Supplementary items of this embodiment)
In the above embodiment, the floor cross member 18 is spanned between the rockers 14 and 16 as shown in FIG. 1, but for example, the hydrogen tank 47 is large as shown in FIG. In the case of the diameter, the hydrogen tank 47 may be disposed along the vehicle front-rear direction below the tunnel portion 50 projecting along the vehicle front-rear direction at the center of the floor panel 48 in the vehicle width direction. .

  In this case, the floor cross member 52 is bridged between a pair of rockers 54 disposed at both ends of the floor panel 48 in the vehicle width direction with the tunnel portion 50 interposed therebetween. And here, although the floor cross member 52 is formed along the shape of the tunnel part 50, it is not restricted to this.

  For example, although not shown, the floor cross member may be divided by the tunnel portion and provided in two along the vehicle width direction. However, in this case, one end in the longitudinal direction of the floor cross member is coupled to the rocker, and the other end in the longitudinal direction of the floor cross member is coupled to the tunnel portion. For this reason, the rocker makes it possible to obtain a reaction force from the tunnel portion by the transmission load transmitted from the rocker to the floor cross member. Therefore, in this case, for example, it is desirable to increase the rigidity of the tunnel part itself by disposing a reinforcing member in the tunnel part.

  Moreover, although the above embodiment demonstrated the vehicle using the battery pack 20 (refer FIG. 2) and the hydrogen tank 44 (refer FIG. 4) as a driving force supply apparatus, this embodiment is a gasoline vehicle. Is also applicable.

  In the case of a gasoline vehicle, for example, as shown in FIG. 6, there is no need to provide a driving force supply device below the floor panel 56, so the position of the floor panel 56 in the vertical direction is set low. be able to. For this reason, the shock absorbing portion (third shock absorbing portion) 60 provided so as to overlap with the floor cross member 58 disposed on the floor panel 56 in a side view of the vehicle is provided on the lower 62A side of the rocker 62. It becomes.

<Third Embodiment>
(Configuration in this embodiment)

  First, the configuration of the vehicle lower structure according to the present embodiment will be described. In the first embodiment described above, as shown in FIG. 2, a ladder-like impact absorbing portion 38 that overlaps the floor cross member 18 in a vehicle side view is provided in the upper closed cross-section portion 36 of the rocker 14. . On the other hand, the battery pack 20 is disposed on the lower side of the floor panel 12, and a ladder-like impact absorbing portion 40 that overlaps the battery pack 20 in a side view of the vehicle is disposed in the lower closed cross-section portion 34 of the rocker 14. Is provided.

  On the other hand, in the present embodiment, as shown in FIG. 8, a ladder-like impact absorbing portion (first impact absorbing portion) 40 is provided in the lower closed cross-sectional portion 34 of the rocker 63. In the upper closed cross-section portion 36 of the rocker 63, a ladder-like impact absorbing portion 38 (see FIG. 2) is not provided. In the following description, the description of the substantially same configuration as in the first embodiment is omitted. Further, since the rocker 65 shown in FIG. 7 has substantially the same configuration as the rocker 63, the description thereof is omitted as in the first embodiment.

  When this embodiment is described concretely, the horizontal wall which comprises a part of the inner part 24 of the rocker 63 and connects the upper inner wall part 24A and the lower inner wall part 24B formed along the vertical direction of the vehicle along the substantially horizontal direction. The portion 24 </ b> C extends to the outer portion 22 side of the rocker 63 and connects the inner portion 24 and the outer portion 22. That is, the partition wall (fifth shock absorbing portion) 25 that partitions the upper portion 14A and the lower portion 14B of the rocker 14 is provided along the substantially horizontal direction. The partition wall 25 and the lateral wall portion 24C are integrally formed, but have different names for the purpose of avoiding confusion.

  The lateral wall portion 24 </ b> C here is slightly inclined downward toward the inner side in the vehicle width direction, but is formed along the substantially horizontal direction at the tip portion. Moreover, although the three connection walls 40C in the shock absorbing part 40 are provided, the present invention is not limited to this, and four or more connection walls may be provided. When the number of the connecting walls 40C is increased, when formed with the same plate thickness, the rigidity of the shock absorber 40 itself can be improved and the amount of energy absorbed when an impact load is input can be increased.

  By the way, as shown in FIG. 7, the floor cross member 18 includes a front wall portion 18A disposed at a front portion in the vehicle front-rear direction, a rear wall portion 18B disposed at a rear portion in the vehicle front-rear direction, and a front wall portion. The upper wall part 18C which connected the upper end of 18A and the upper end of the rear wall part 18B to the vehicle horizontal direction is comprised. Note that, among the plurality of floor cross members 18 shown in FIG. 7, the floor cross member 18 at the center in the vehicle front-rear direction has a seat bracket 21 on which the occupant sits is attached to the upper wall portion 18C. The position in the height direction is lower than the upper wall portion 18C of the other floor cross member 18.

  Further, a flange portion 18D extends from the lower end of the front wall portion 18A of the floor cross member 18 toward the front side, and from the lower end of the rear wall portion 18B, the flange portion 18E ( (See FIG. 8) is extended. The flange portions 18D and 18E are respectively joined to the floor panel 12, thereby forming a closed cross-section portion 19 (see FIG. 8) between the floor cross member 18 and the floor panel 12.

  Further, as shown in FIG. 8, the upper flange portion 18 </ b> F extends from the both ends in the vehicle width direction of the upper wall portion 18 </ b> C of the floor cross member 18 toward the outside in the vehicle width direction. The upper flange portion 18F is joined to the upper surface of the inclined upper wall portion 24D of the inner portion 24 constituting a part of the upper closed cross-section portion 36 of the rocker 63. Although not shown, flange portions extend from the both ends of the front wall portion 18A (see FIG. 7) and the rear wall portion 18B of the floor cross member 18 toward the front side and the rear side, respectively. The upper inner wall portion 24A of the inner portion 24 is joined to each other.

  Here, in the present embodiment, as shown in FIG. 7, a battery pack (storage battery) 20 composed of a lithium ion battery, a nickel metal hydride battery, or the like is a box that is long in the vehicle front-rear direction and flat in the vehicle vertical direction. The battery case 64 formed in a shape and a plurality of battery modules 20A housed in the battery case 64 are provided, and the battery module 20A is constituted by a plurality of rectangular storage batteries.

  As shown in FIGS. 7 and 8, the battery case 64 includes a peripheral wall 66 that forms the outer shape of the battery case 64 and a top plate 68 that forms a lid of the battery case 64 (not shown in FIG. 7). ) And a bottom plate 70 constituting the bottom of the battery case 64.

  The peripheral wall 66 is formed by bending a long extruded product formed by light metal extrusion, such as an aluminum alloy, into a rectangular frame shape, and joining both ends in the longitudinal direction of the extruded product to each other. And has a substantially rectangular frame shape in plan view. The top plate 68 is formed by press-molding a plate material made of a light metal such as an aluminum alloy, and is fixed to the upper surface of the upper wall portion 66C of the peripheral wall 66 through a plurality of bolts 69. .

  Furthermore, the bottom plate 70 is formed by press-molding a plate material made of a light metal such as an aluminum alloy, and is fixed to the lower surface of the lower wall portion 66D of the peripheral wall 66 by means such as welding or riveting. Moreover, the outer edge part of the baseplate 70 is made into the fixed piece 30, and it protrudes to the vehicle outer side of the vehicle horizontal direction rather than the surrounding wall 66, as FIG. 7 shows. The fixing piece 30 is fastened (coupled) to the left and right rockers 63, and is fixed to the rocker 63 in a state where the battery case 64, that is, the battery pack 20 is supported from below by the bottom plate 70.

Here, the configuration of the peripheral wall 66 will be described.
As shown in FIGS. 7 and 8, the peripheral wall 66 includes a pair of left and right side wall portions 66S facing in the vehicle width direction, and a front wall portion 66Fr facing in the vehicle front-rear direction and connecting the front ends of the pair of side wall portions 66S. And a rear wall portion 66Rr that connects the rear ends of the pair of side wall portions 66S. As shown in FIG. 8, the peripheral wall 66 has a substantially B-shaped (substantially Japanese character) cross-sectional shape viewed from the circumferential direction (longitudinal direction of the extruded product).

  The cross-sectional shape of the peripheral wall 66 will be specifically described. The peripheral wall 66 includes an outer peripheral wall portion 66A that forms the outer peripheral surface of the peripheral wall 66, and an inner surface that faces the outer peripheral wall portion 66A and forms the inner peripheral surface of the peripheral wall 66. The peripheral wall 66B, the upper wall 66C that connects the upper end of the outer peripheral wall 66A and the upper end of the inner peripheral wall 66B in the vehicle horizontal direction, and the lower that connects the lower end of the outer peripheral wall 66A and the lower end of the inner peripheral wall 66B in the vehicle horizontal direction A wall portion 66D, and a partition wall portion 66E that connects an intermediate portion in the vertical direction of the outer peripheral wall portion 66A and the inner peripheral wall portion 66B in the vehicle horizontal direction. The partition wall 66E divides the peripheral wall 66 into an upper portion 72 and a lower portion 74, and is partitioned (partitioned) into an upper space 72A and a lower space 74A.

  On the other hand, a battery cross member (first cross member) 76 is bridged along the vehicle width direction on the bottom plate 70 between the pair of side wall portions 66S facing the vehicle width direction of the peripheral wall 66 and the side wall portions 66S. Has been. The battery cross members 76 are arranged in a plurality (three in this case) at equal intervals along the vehicle longitudinal direction between the front wall portion 66Fr and the rear wall portion 66Rr.

  The battery cross member 76 is formed of a long extruded product formed by extrusion of a light metal such as an aluminum alloy, for example, and extends in a width direction substantially orthogonal to the longitudinal direction (vehicle width direction). Although not shown in the cross-sectional shape when cut along, it is formed in a substantially B shape (substantially Japanese character shape).

  The cross-sectional shape of the battery cross member 76 will be specifically described. As shown in FIG. 8, the battery cross member 76 includes a front wall portion (not shown) disposed at the front portion in the vehicle front-rear direction, A rear wall 76A disposed at the rear part in the vehicle longitudinal direction, an upper wall part 76B connecting the upper end of the front wall part and the upper end of the rear wall part 76A in the vehicle horizontal direction, a lower end of the front wall part and the rear wall part 76A The lower wall part 76C which connected the lower end of this to the vehicle horizontal direction, and the partition wall part 76D which connected the up-down direction intermediate part of the upper wall part 76B and the lower wall part 76C to the vehicle horizontal direction. The partition member 76D divides the battery cross member 76 into an upper part 78 and a lower part 80, and is partitioned into an upper space 78A and a lower space 80A.

  Here, in this embodiment, on the upper portion 63A side of the rocker 63, the inclined upper wall portion 22B of the outer portion 22, the inclined upper wall portion 24D of the inner portion 24, and the upper wall portion 18C of the floor cross member 18 are: It is set so as to be continuously arranged in the vehicle width direction and overlap in a vehicle side view.

  Here, “continuously arranged in the vehicle width direction” indicates that the impact load F can be transmitted along the vehicle width direction, and members adjacent in the vehicle width direction are not necessarily There is no need to be adjacent to each other, and a slight gap may be provided. Furthermore, at least a part of the members adjacent in the vehicle width direction may overlap the vehicle top and bottom.

  In addition, “overlapping in the vehicle side view” here indicates that the impact load F can be transmitted along the vehicle width direction, and members disposed adjacent to each other in the vehicle width direction. Thus, it is only necessary that at least a part of the vehicle in the vertical direction overlaps in the vehicle side view. However, in a member (integrated member) that is joined and integrated in a state where a plurality of members are overlapped in the vehicle vertical direction, the impact load F is transmitted through the integrated member as a whole, so that it is adjacent in the vehicle width direction. It is only necessary that a part of the integrated member overlaps the members arranged in a side view of the vehicle.

  Specifically, on the upper part 63A side of the rocker 63, the partition wall 25 and the lateral wall part 24C of the rocker 63, the floor panel 12, the flange part 18D of the floor cross member 18 (see FIG. 7), and the flange part 18E. Are continuously arranged in the vehicle width direction and set so as to overlap in a side view of the vehicle.

  Here, the floor panel 12 is joined on the lateral wall portion 24 </ b> C of the rocker 63, and the flange portion 18 </ b> D and the flange portion 18 </ b> E of the floor cross member 18 are joined on the floor panel 12. That is, the horizontal wall portion 24C of the rocker 63 and the flange portion 18D and the flange portion 18E of the floor panel 12 and the floor cross member 18 are overlapped with each other in the vertical direction of the vehicle.

  Then, the lateral wall portion 24C of the rocker 63, the floor panel 12, and the flange portion 18D and the flange portion 18E of the floor cross member 18 are joined in an integrated state, and some of these are joined to the rocker 63 in a side view of the vehicle. It overlaps with the partition wall 25.

  On the lower 63B side of the rocker 63, on the lower 63B side of the rocker 63, the upper wall (first lateral wall) 40A of the shock absorbing part 40, the upper wall part 66C of the peripheral wall 66 of the battery case 64, and the battery cross member An upper wall portion (second lateral wall) 76B of 76 is set so as to be continuously arranged in the vehicle width direction and overlap in a side view of the vehicle.

  Further, the lower wall (first lateral wall) 40B of the shock absorber 40 of the rocker 63, the partition wall 66E of the peripheral wall 66 of the battery case 64, and the partition wall (second lateral wall) 76D of the battery cross member 76 are provided. These are set so as to be continuously arranged in the vehicle width direction and overlap in a side view of the vehicle.

  Furthermore, the bottom wall portion 24E of the rocker 63, the lower wall portion 66D of the peripheral wall 66 of the battery case 64, and the lower wall portion 76C of the battery cross member 76 are continuously arranged in the vehicle width direction and the vehicle. It is set to overlap in a side view.

(Operations and effects in this embodiment)
Next, functions and effects of the vehicle lower structure according to the present embodiment will be described.

  As shown in FIG. 8, the rocker 63 in the present embodiment includes an outer portion 22 positioned on the outer side in the vehicle width direction and an inner portion 24 positioned on the inner side in the vehicle width direction. The portion 22 and the inner portion 24 form a closed cross section 26. Thereby, the rocker 63 can increase the rigidity of the rocker 63 itself as compared to the case where the two panels of the outer portion 22 and the inner portion 24 are joined.

  In the closed cross-section portion 26 of the rocker 63, the impact absorbing portion 40 is bridged in the vehicle width direction between the outer portion 22 and the inner portion 24 at a position overlapping the battery pack 20 in a vehicle side view. On the other hand, in the present embodiment, as shown in FIG. 7, the battery pack 20 includes a battery case 64, and a plurality of battery cross members 76 are installed in the battery case 64 along the vehicle width direction. Has been passed. Thereby, the rigidity of battery case 64 itself is improving.

  Here, in the present embodiment, the battery cross member 76 is set so as to overlap with the lower closed section 34 of the rocker 63 in a vehicle side view. Therefore, for example, when an impact load F is input to the rocker 63 at the time of a side collision of the vehicle, a part of the impact load F is transmitted to the battery cross member 76 side of the battery case 64 via the impact absorbing portion 40. (Transmission load F5).

  When the transmission load F5 is transmitted to the battery cross member 76 side of the battery case 64, the rocker 63 passes through the battery cross member 76 (strictly speaking, through the battery cross member 76 and the battery case 64). The reaction force N5 from the rocker 65 (see FIG. 7) opposite to the rocker 63 to which the impact load F is input is obtained, and the shock absorbing portion 40 is plastically deformed. The impact energy is absorbed by the plastic deformation of the impact absorbing portion 40. Thereby, even if it is a short stroke, it becomes possible to reduce the impact load F. FIG.

  As described above, in the present embodiment, the shock absorber 40 is provided so as to overlap with the battery pack 20 provided on the lower side of the floor panel 12 in the closed cross-section portion 26 of the rocker 63 in a vehicle side view, and The battery cross member 76 of the battery case 64 is set so as to overlap the impact absorbing portion 40 in a vehicle side view.

  Thereby, at the time of a side collision of the vehicle, the impact absorbing portion 40 is plastically deformed using the reaction force N5 from the battery cross member 76, and the impact load F can be reduced even in a short stroke, The internal folding of the rocker 63 can be suppressed.

  More specifically, in the present embodiment, the battery cross member 76 spanned in the battery case 64, the peripheral wall 66 of the battery case 64, and the shock absorbing portion 40 of the rocker 63 have a vehicle width. It is arranged continuously in the direction.

  The battery cross member 76 includes an upper wall portion 76B, a partition wall portion 76D, and a lower wall portion 76C that are respectively bridged in the vehicle width direction. The peripheral wall 66 that constitutes the outer wall of the battery case 64 includes an upper wall portion 66C, a partition wall portion 66E, and a lower wall portion 66D that are spanned in the vehicle width direction. Furthermore, the impact absorbing portion 40 spanned in the rocker 63 includes an upper wall 40A and a lower wall 40B that are spanned in the vehicle width direction.

  In this embodiment, the upper wall portion 76B of the battery cross member 76 in the battery case 64 includes the upper wall portion 66C of the peripheral wall 66 of the battery case 64 and the upper wall 40A of the shock absorbing portion 40 of the rocker 63, and the vehicle. It is set to overlap in a side view.

  For this reason, when an impact load F is input to the rocker 63 at the time of a side collision of the vehicle, a part of the impact load F is transferred to the battery case 64 via the upper wall 40A of the impact absorbing portion 40 of the rocker 63. It is transmitted to the upper wall portion 66C of the peripheral wall 66 and the upper wall portion 76B side of the battery cross member 76 (transmission load F51). When the transmission load F51 is transmitted to the upper wall portion 76B side of the battery cross member 76, the upper wall 40A of the shock absorbing portion 40 of the rocker 63 is opposite to the upper wall portion 76B of the battery cross member 76. A force N51 is obtained.

  Further, the partition wall portion 76D of the battery cross member 76 is set so as to overlap the partition wall portion 66E of the peripheral wall 66 of the battery case 64 and the lower wall 40B of the shock absorber 40 of the rocker 63 in a side view of the vehicle. .

  For this reason, when an impact load F is input to the rocker 63 at the time of a side collision of the vehicle, another part of the impact load F is passed through the lower wall 40B of the impact absorbing portion 40 and the peripheral wall of the battery case 64. It transmits to the partition wall part 66D of 66, and the partition wall part 76D side of the cross member 76 for batteries (transmission load F52). When the transmission load F52 is transmitted to the partition wall 76D side of the battery cross member 76, the lower wall 40B of the shock absorber 40 of the rocker 63 is separated from the partition wall 76D of the battery cross member 76. Reaction force N52 is obtained.

  Further, the lower wall portion 76C of the battery cross member 76 of the battery case 64 is set to overlap the lower wall portion 66D of the peripheral wall 66 of the battery case 64 and the bottom wall portion 24E of the rocker 63 in a side view of the vehicle. .

  For this reason, when the impact load F is input to the rocker 63 at the time of a side collision of the vehicle, the other part of the impact load F is passed through the bottom wall portion 24E of the rocker 63 and the peripheral wall 66 of the battery case 64. The lower wall portion 66D and the battery cross member 76 are transmitted to the lower wall portion 76C side (transmission load F53). When the transmission load F53 is transmitted to the lower wall portion 76C side of the battery cross member 76, the bottom wall portion 24E of the rocker 63 generates a reaction force N53 from the lower wall portion 76C side of the battery cross member 76. obtain.

  As described above, in the present embodiment, the upper wall portion 76B of the battery cross member 76 of the battery case 64, the upper wall portion 66C of the peripheral wall 66, and the upper wall 40A of the shock absorbing portion 40 of the rocker 63 are arranged in the vehicle width direction. It is set so that they are arranged continuously and overlap in a side view of the vehicle. Further, the partition wall 76D of the battery cross member 76 of the battery case 64, the partition wall 66E of the peripheral wall 66, and the lower wall 40B of the shock absorber 40 of the rocker 63 are continuously arranged in the vehicle width direction and the vehicle. It is set to overlap in a side view. Further, the lower wall portion 76C of the battery cross member 76 of the battery case 64, the lower wall portion 66D of the peripheral wall 66, and the bottom wall portion 24E of the rocker 63 are continuously arranged in the vehicle width direction and overlap in the vehicle side view. Is set to

  Thereby, when the impact load F is input to the rocker 63 at the time of a side collision of the vehicle, the impact load F can be effectively transmitted (transmission load F5) to the battery pack 20 side, and the battery pack The reaction force N5 from 20 can be reliably obtained, and the shock absorbing portion 40 of the rocker 63 can be plastically deformed more effectively. The impact energy is absorbed by the plastic deformation of the impact absorbing portion 40.

  Thus, in the present embodiment, the shock absorbing portion 40 is provided in the closed cross-section portion 26 of the rocker 63 and the upper wall portion 76B constituting at least a part of the battery cross member 76 of the battery case 64 is absorbed in the shock. The reaction force N51 from the battery cross member 76 can be effectively obtained on the side of the rocker 63 by setting so as to overlap the upper wall 40A of the impact absorbing portion 40 constituting at least a part of the portion 40 in a side view of the vehicle. Can do.

  Similarly to the upper wall portion 76B of the battery cross member 76, the partition wall portion 76D of the battery cross member 76 is set so as to overlap the lower wall 40B of the shock absorbing portion 40 in a vehicle side view. On the 63 side, the reaction force N52 from the battery cross member 76 can be effectively obtained. Further, by setting the lower wall portion 76C of the battery cross member 76 so as to overlap the bottom wall portion 24E of the rocker 63 in a side view of the vehicle, the reaction force N53 from the battery cross member 76 is effectively increased on the rocker 63 side. Can get to. In other words, since the battery cross member 76 contributes to the generation of a high load with the above configuration, the amount of impact energy absorbed can be increased, and the impact load F can be reduced even with a short stroke.

  By the way, in the present embodiment, further, on the upper part 63A side of the rocker 63, the inclined upper wall part 22B of the outer part 22, the inclined upper wall part 24D of the inner part 24 of the rocker 63, and the upper wall part of the floor cross member 18 18C is set so as to be continuously arranged in the vehicle width direction and overlap in a side view of the vehicle. Further, the partition wall 25 and the lateral wall portion 24C of the rocker 63, the flange portion 18D (see FIG. 7) of the floor panel 12 and the floor cross member 18, and the flange portion 18E are continuously arranged in the vehicle width direction. It is set to overlap in the side view of the vehicle.

  Also in this case, similarly to the lower part 63B side of the rocker 63, when the impact load F is input to the rocker 63 at the time of a side collision of the vehicle, the impact load F is effectively transmitted to the floor cross member 18 side ( The rocker 63 obtains a reaction force N6 from the floor cross member 18 and is plastically deformed. Thereby, the impact energy is further absorbed.

  Specifically, in the present embodiment, on the upper portion 63A side of the rocker 63, the inclined upper wall portion 22B of the outer portion 22, the inclined upper wall portion 24D of the inner portion 24, and the upper wall of the floor cross member 18 are arranged. The portion 18C is arranged so as to be continuously arranged in the vehicle width direction and overlap in the vehicle side view.

  Therefore, when an impact load F is input to the rocker 63 at the time of a side collision of the vehicle, a part of the impact load F is passed through the inclined upper wall portion 22 </ b> B of the outer portion 22 of the rocker 63. To the inclined upper wall portion 24D and the upper wall portion 18C of the floor cross member 18 (transmission load F61).

  When the transmission load F61 is transmitted to the upper wall portion 18C side of the floor cross member 18, the inclined upper wall portion 22B of the rocker 63 is moved to the upper wall portion 18C (strictly speaking, the floor cross member 18). A reaction force N61 from the rocker 65 (see FIG. 7) located on the opposite side of the rocker 63 to which the transmission load F61 is transmitted is obtained through the member 18.

  In the present embodiment, the partition wall 25 and the lateral wall portion 24C of the rocker 63, the floor panel 12, the flange portion 18D (see FIG. 7) of the floor cross member 18, and the flange portion 18E are continuous in the vehicle width direction. And are set so as to overlap in a side view of the vehicle.

  For this reason, when the impact load F is input to the rocker 63 at the time of a side collision of the vehicle, a part of the impact load F is passed through the partition wall 25 of the rocker 63 and the lateral wall portion 24C, the floor panel 12 and the floor. It is transmitted to the flange portions 18D and 18E of the cross member 18 (transmission load F62).

  When the transmission load F62 is transmitted to the side wall portion 24C, the floor panel 12 and the flange portions 18D and 18E of the floor cross member 18, the partition wall 25 of the rocker 63 becomes the flange of the floor panel 12 and the floor cross member 18. Portions 18D and 18E (strictly speaking, the rocker 65 located on the opposite side of the rocker 63 to which the transmission load F62 is transmitted through the flange portions 18D and 18E of the floor panel 12 and the floor cross member 18 (see FIG. 7). ) To obtain a reaction force N62.

  In other words, in the above configuration, when the vehicle collides, a part of the impact load F inputted to the rocker 63 is on the floor cross member 18 side via the upper part 63A side of the rocker 63 including the partition wall 25 of the rocker 63. Is transmitted (transmitted load F6). When the transmission load F <b> 6 is transmitted to the floor cross member 18, the rocker 63 obtains a reaction force N <b> 6 from the floor cross member 18. Thereby, the upper part 63A side of the rocker 63 is plastically deformed, and impact energy is absorbed.

  Therefore, in this embodiment, the impact energy can be further absorbed by the plastic deformation on the upper part 63A side of the rocker 63 including the shock absorbing part 40 provided on the lower part 63B side of the rocker 63 and the partition wall 25 of the rocker 63. .

  In the present embodiment, the load transmission path C that is transmitted to the battery pack 20 side through the impact absorbing portion 40 of the rocker 63 and the upper portion of the rocker 63 including the partition wall 25 of the rocker 63 at the time of a side collision of the vehicle. A load transmission path D that is transmitted to the floor cross member 18 side through the 63A side can be formed. Therefore, it is possible to achieve load distribution in the impact load F input to the rocker 63.

  In other words, in the present embodiment, the shock absorbing portion 40 and the partition wall 25 are provided in the closed cross-section portion 26 of the rocker 63, and the battery pack 20 and the floor cross member are connected to the shock absorbing portion 40 and the partition wall 25 in a vehicle side view. 18, by using the reaction force N <b> 5 from the battery pack 20 and the reaction force N <b> 6 from the floor cross member 18, the inner folding of the rocker 63 can be suppressed.

(Supplementary items of this embodiment)
In the present embodiment, as shown in FIG. 8, on the upper portion 63 </ b> A side of the rocker 63, the inclined upper wall portion 22 </ b> B of the outer portion 22, the inclined upper wall portion 24 </ b> D of the inner portion 24, and the upper wall of the floor cross member 18. The portion 18C is set so as to be continuously arranged in the vehicle width direction and overlap in the vehicle side view. However, the upper wall portion 18C of the floor cross member 18 and the inclined upper wall portion 24D of the inner portion 24 do not necessarily overlap in the vehicle side view, and the floor cross member 18 is not necessarily required.

  Further, in the present embodiment, instead of the shock absorbing portion 38 (see FIG. 2), only the partition wall 25 is provided on the upper portion 63A side of the rocker 63, but the shock absorbing portion 38 may be provided. Of course. That is, by changing the shape of the impact absorbing portion, the impact energy absorption rate can be adjusted between the upper 63A side and the lower 63B side of the rocker 63 in the event of a side collision of the vehicle.

<Fourth embodiment>
In the third embodiment described above, as shown in FIG. 7, the battery pack 20 is used as a driving force supply device for supplying power to the power unit. However, in the present embodiment, as the driving force supply device, A case where the fuel cell 82 shown in FIG. 9 is used will be described. In the following description, the description of the substantially same configuration as that of the third embodiment is omitted.

  As shown in FIG. 9, the fuel cell 82 is formed in a box shape that is long in the vehicle front-rear direction and flat in the vehicle vertical direction, like the battery pack 20 (see FIG. 7) described in the third embodiment. A tank case 84 is provided. Inside the tank case 84, for example, a plurality of hydrogen tanks 86 filled with hydrogen are accommodated.

  Similar to the battery case 64 (see FIG. 7), the tank case 84 includes a peripheral wall 66, a top plate 68, and a bottom plate 70. The configuration of these members is the same as that of the battery case 64. Since it is the same, the explanation is omitted.

  By the way, the hydrogen tanks 86 accommodated in the tank case 84 are arranged along the vehicle width direction in the tank case 84 and are arranged in a plurality along the vehicle front-rear direction (here, 13). Therefore, in the present embodiment, a tank cross member (second cross member) 88 is disposed on the bottom plate 70 between the pair of side wall portions 66S and the side wall portions 66S of the peripheral wall 66 facing each other in the vehicle width direction. A plurality (12 in this case) are bridged along the direction. Thus, the rigidity of the tank case 84 itself is improved by bridging a plurality of tank cross members 88 along the vehicle width direction in the tank case 84.

  The tank cross member 88 defines a space between the hydrogen tanks 86 arranged adjacent to each other in the vehicle longitudinal direction. As shown in FIG. 10, both ends of the tank body 86 </ b> A in the longitudinal direction (here, the vehicle width direction) are set so as not to directly contact the inner peripheral wall 66 </ b> B of the peripheral wall 66.

  Here, in the present embodiment, in the closed cross-section portion 26 of the rocker 63, the shock absorbing portion 40 is bridged in the vehicle width direction between the outer portion 22 and the inner portion 24 at a position overlapping the fuel cell 82 in a side view of the vehicle. Has been. On the other hand, in the fuel cell 82, as shown in FIG. 9, a tank cross member 88 is bridged in the tank case 84 along the vehicle width direction.

  In the present embodiment, the tank cross member 88 is positioned so as to overlap with a ladder-like shock absorbing portion (fourth shock absorbing portion) 40 provided in the lower closed cross-sectional portion 34 of the rocker 63 in a side view of the vehicle. Is set to The configuration of the tank cross member 88 and the relationship between the tank cross member 88 and the shock absorber 40 are substantially the same as the battery cross member 76 shown in FIG. In the tank cross member 88 shown in FIG. 10 instead of 76A, the upper wall portion 76B, the lower wall portion 76C, and the partition wall portion 76D, the rear wall portion 88A, the upper wall portion 88B, the lower wall portion 88C, and the partition wall portion, respectively. A description of 88D will be omitted.

  By the way, in the second embodiment described above, as shown in FIG. 4, the shock absorber 38 is provided in a position where the rocker 46 does not overlap with the hydrogen tank 44 when viewed from the side of the vehicle (on the upper 46 </ b> A side). The impact load F is not input to the hydrogen tank 44 side.

  On the other hand, in this embodiment, as shown in FIG. 10, a part of the impact load F is input to the hydrogen tank 86 side. As a reason for this, in the present embodiment, as shown in FIG. 9, in the fuel cell 82, a tank case 84 that houses a plurality of hydrogen tanks 86 is provided, and the vehicle is placed in the peripheral wall 66 that forms the outer shape of the tank case 84 By laying a plurality of tank cross members 88 along the width direction, the rigidity of the tank case 84 itself is improved. Furthermore, as shown in FIG. 10, both end portions of the tank body 86 </ b> A in the longitudinal direction are set so as not to directly contact the inner peripheral wall portion 66 </ b> B of the peripheral wall 66. As described above, even when the impact load F is input to the rocker 63 and a part of the impact load F is transmitted to the fuel cell 82 side (transmission load F7) at the time of a side collision of the vehicle, the transmission load F7 is a hydrogen tank. 86 is not directly input.

  In this embodiment, when the transmission load F7 is transmitted to the tank cross member 88 side of the tank case 84, the rocker 63 causes the tank cross member 88 (strictly speaking, the tank cross member 88 to As a result, a reaction force N7 is obtained from the rocker 65 (see FIG. 7) on the opposite side to the rocker 63 to which the transmission load F7 is transmitted, whereby the shock absorbing portion 40 of the rocker 63 is plastically deformed and the shock energy is absorbed. That is, according to the present embodiment, the impact load can be reduced even with a short stroke, and therefore a part of the impact load F can be transmitted to the fuel cell 82 side.

  As described above, in the present embodiment, the shock absorbing portion 40 is provided in the closed cross-section portion 26 of the rocker 63 and the tank cross member 88 of the tank case 84 is overlapped with the shock absorbing portion 40 in a vehicle side view. By setting the position, it is possible to use the reaction force N7 from the tank cross member 88 and to suppress the internal folding of the rocker 63.

  As described above, an example of the embodiment of the present invention has been described. However, the embodiment of the present invention is not limited to the above, and one embodiment and various modifications may be used in combination as appropriate. Needless to say, the present invention can be implemented in various forms without departing from the gist of the invention.

10 Vehicle lower part (vehicle lower structure)
12 Floor panel 14 Rocker 16 Rocker 18 Floor cross member 20 Battery pack (storage battery)
22 Outer (Rocker)
24 Inner Club (Rocker)
25 partition wall (5th shock absorber, rocker)
26 Closed section 38 Shock absorber (second shock absorber, rocker)
40 Shock absorber (first shock absorber, fourth shock absorber, rocker)
40A Upper wall (first horizontal wall, third horizontal wall)
40B Lower wall (1st horizontal wall, 3rd horizontal wall)
42 Rocker 44 Hydrogen tank (fuel cell)
46 Rocker 47 Hydrogen tank (fuel cell)
48 Floor panel 50 Tunnel part 52 Floor cross member 54 Rocker 56 Floor panel 58 Floor cross member 60 Shock absorbing part (third shock absorbing part)
62 Rocker 63 Rocker 64 Battery case 65 Rocker 76 Battery cross member (first cross member)
76B Upper wall (second horizontal wall)
76D Partition wall (second horizontal wall)
82 Fuel cell 84 Tank case 86 Hydrogen tank (fuel tank)
88 Cross member for tank (second cross member)
88B Upper wall (4th horizontal wall)
88D Partition wall (4th horizontal wall)

Claims (10)

A pair of rockers disposed on both outer sides of the vehicle floor panel in the vehicle width direction and extending along the vehicle longitudinal direction;
A storage battery disposed on the vehicle lower side of the floor panel;
With
The rocker
An outer part located outside in the vehicle width direction;
An inner portion that is integrally formed with the outer portion, is located on the inner side of the outer portion in the vehicle width direction, and forms a closed cross-section portion with the outer portion;
A first shock absorber that is bridged in the vehicle width direction between the outer portion and the inner portion in the closed cross-sectional portion, and is disposed at a position overlapping the storage battery in a side view of the vehicle;
The vehicle lower structure comprised including. On the floor panel, further comprising a floor cross member disposed between the pair of rockers and spanned along the vehicle width direction,
The rocker further includes a second shock absorber disposed between the outer portion and the inner portion in the closed cross-section portion in the vehicle width direction and disposed at a position overlapping the floor cross member in a side view of the vehicle. The vehicle lower structure according to claim 1, wherein the vehicle lower structure is included.   The storage battery includes a battery case that houses a plurality of battery modules, and a first cross that is bridged along the vehicle width direction in the battery case so as to overlap with the first shock absorber in a side view of the vehicle. The vehicle lower structure according to claim 1 or 2, wherein a member is provided.   The first shock absorbing portion includes a first lateral wall that is spanned in the vehicle width direction, and the first cross member overlaps the first lateral wall that is spanned in the vehicle width direction in a side view of the vehicle. The vehicle lower part structure according to claim 3, comprising the second lateral wall. A pair of rockers disposed on both outer sides of the vehicle floor panel in the vehicle width direction and extending along the vehicle longitudinal direction;
On the floor panel, a floor cross member disposed between the pair of rockers and spanned along the vehicle width direction;
With
The rocker
An outer part located outside in the vehicle width direction;
An inner portion that is integrally formed with the outer portion, is located on the inner side of the outer portion in the vehicle width direction, and forms a closed cross-sectional portion with the outer portion;
A third shock absorbing portion that is bridged in the vehicle width direction between the outer portion and the inner portion in the closed cross-sectional portion, and is disposed at a position overlapping the floor cross member in a vehicle side view;
The vehicle lower structure comprised including.   The vehicle lower structure according to claim 5, wherein a fuel cell is disposed on a vehicle lower side of the floor panel. A tunnel portion that protrudes toward the vehicle interior side and extends along the vehicle front-rear direction is provided at the center of the floor panel in the vehicle width direction,
The vehicle lower structure according to claim 5 or 6, wherein the floor cross member is bridged between the pair of rockers with the tunnel portion interposed therebetween. A pair of rockers disposed on both outer sides of the vehicle floor panel in the vehicle width direction and extending along the vehicle longitudinal direction;
A fuel cell disposed on the vehicle lower side of the vehicle floor panel;
With
The rocker
An outer part located outside in the vehicle width direction;
An inner portion that is integrally formed with the outer portion, is located on the inner side of the outer portion in the vehicle width direction, and forms a closed cross-sectional portion with the outer portion;
A fourth shock absorbing portion spanned in the vehicle width direction between the outer portion and the inner portion in the closed cross-section portion;
Comprising
The fuel cell includes a tank case in which fuel tanks arranged along the vehicle width direction are arranged along the vehicle front-rear direction, and the fuel tanks arranged adjacent to each other in the vehicle front-rear direction in the tank case A vehicle lower structure in which a second cross member is provided that extends along the vehicle width direction at a position that divides the space and overlaps the fourth shock absorber in a side view of the vehicle.   The fourth shock absorbing portion includes a third horizontal wall spanned in the vehicle width direction, and the second cross member overlaps the third lateral wall spanned in the vehicle width direction in a side view of the vehicle. The vehicle lower structure according to claim 8, comprising a fourth lateral wall. On the floor panel, a floor cross member disposed between the pair of rockers and spanned along the vehicle width direction;
A fifth shock absorber disposed between the outer portion and the inner portion in the vehicle cross-sectional direction in the closed cross-section portion of the rocker, and disposed at a position overlapping the floor cross member in a vehicle side view;
The vehicle lower structure according to claim 8 or 9, further comprising: