JP7306544B2 - vehicle undercarriage - Google Patents

Description

The present invention relates to a vehicle undercarriage.

Japanese Unexamined Patent Application Publication No. 2002-200002 discloses a technique related to a vehicle lower structure that supports a battery unit, which is one of driving force supply devices, on the vehicle lower side of a floor panel. Specifically, in this prior art, a rectangular tubular battery side frame is arranged between the rocker and the battery unit and attached 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 deforms toward the inside in the vehicle width direction (the inside of the rocker), a tensile force acts on the inside of the rocker in the vehicle width direction. In the prior art, as described above, since the rocker is provided adjacent to the battery side frame, a compressive force acts on the rocker side of the battery side frame.

In other words, in the prior art described above, in the rocker and the battery side frame, the stresses acting on each other cancel each other out between the tensile force and the compressive force acting on adjacent portions. Accordingly, deformation of the rocker and the battery side frame is suppressed, and intrusion of the rocker inward in the vehicle width direction (so-called inward bending) is suppressed.

JP 2013-133046 A

However, if a large load is applied locally to the rocker, as in the case of a so-called pole side collision, the rocker may bend inward.

SUMMARY OF THE INVENTION An object of the present invention is to provide a vehicle lower structure capable of absorbing impact energy more effectively and suppressing inward bending of rockers.

In the vehicle underbody structure according to the present invention, the pair of rockers extending in the vehicle front-rear direction are arranged on both outer sides of the floor panel of the vehicle in the vehicle width direction, respectively. an inner portion integrally formed with the outer portion and positioned inside in the vehicle width direction to form a closed cross-sectional portion together with the outer portion; and the outer portion and the inner portion integrally formed. A first impact absorbing portion that is formed in the closed cross-section portion and spans in the vehicle width direction between the outer portion and the inner portion in a state in which a gap is provided on the upper side and the lower side in the vehicle vertical direction to connect the two. A storage battery is arranged on the vehicle lower side of the floor panel, and the first shock absorbing portion is arranged at a position overlapping the storage battery when viewed from the side of the vehicle, and on the floor panel , a floor cross member is disposed between the pair of rockers and spans along the width direction of the vehicle, and is integrally formed with the outer portion and the inner portion and is formed on the upper side and the lower side in the vehicle vertical direction within the closed cross-sectional portion. A second shock absorbing portion spans between the outer portion and the inner portion with a gap provided between them in the vehicle width direction to connect the two, and the second shock absorbing portion is located on the floor cross when viewed from the side of the vehicle. It is provided at a position overlapping with the member.

In the vehicle lower portion structure according to the present invention, the rockers are arranged on both sides of the floor panel of the vehicle in the vehicle width direction, respectively, and each rocker extends along the vehicle front-rear direction. there is Here, the rocker is integrally formed with an outer portion located outside in the vehicle width direction and an inner portion located inside in the vehicle width direction, and the outer portion and the inner portion form a closed cross-sectional portion. are doing. Here, "integrally formed" means that the outer portion and the inner portion are integrally formed by extrusion, drawing, or the like.

Further, in the present invention, since the outer portion and the inner portion of the rocker are integrally formed, for example, compared to the case where the rocker is formed by joining two panels of the outer portion and the inner portion, The strength of the rocker itself can be increased.

In addition, when the rocker joins the two panels of the outer portion and the inner portion, welding or fastening is required. is no longer required, and costs can be reduced accordingly.

Further, the first impact absorbing portion is integrally formed with the outer portion and the inner portion within the closed cross-section portion of the rocker, and the outer portion and the inner portion are provided with a gap between the upper side and the lower side in the vertical direction of the vehicle in the closed cross-section portion. It is bridged in the vehicle width direction between the two to connect them . Therefore, part of the impact load input to the rocker in the event of a vehicle side collision (hereinafter referred to as "vehicle side impact") is transmitted inward in the vehicle width direction via the first impact absorbing portion. It will happen.

In general, from the viewpoint of protecting the interior of the vehicle, the rigidity of the inside of the rocker in the vehicle width direction is high. Therefore, when a load is transmitted inward in the vehicle width direction via the first shock absorbing portion, a reaction force is obtained against the rocker. As a result, the first shock absorbing portion is plastically deformed and absorbs the shock energy.

Here, for example, in the case where the shock absorbing portion is provided separately from the rocker as a shock absorbing member, when the shock absorbing member is arranged in the closed section of the rocker, the position of the shock absorbing member is prevented from being displaced by the shock. Therefore, it is necessary to provide a rib or the like for restricting the movement of the impact absorbing member within the closed section.

If such a rib is provided in the closed section of the rocker, the rib may hinder the plastic deformation of the shock absorbing member when an impact load is input to the rocker and the shock absorbing member is plastically deformed. . When the plastic deformation of the impact absorbing member is inhibited in this manner, so-called residual crushing occurs, and the amount of impact energy absorbed by the rocker is reduced by the amount of residual crushing. In other words, there is a possibility that impact energy cannot be efficiently absorbed.

In contrast, in the present invention, since the first shock absorbing portion is integrally formed with the outer portion and the inner portion, there is no need to provide ribs or the like, and it is possible to suppress the residual crushing of the first shock absorbing portion. can. That is, it is possible to effectively absorb the impact energy due to the collision load, thereby suppressing the inward bending of the rocker even if a large load is applied locally to the rocker, such as when a pole side impact occurs. becomes possible.

Further, generally, a storage battery mounted on a vehicle is set to have high rigidity. For this reason, in the present invention , the storage battery is disposed on the vehicle lower side of the floor panel, and the first shock absorbing portion is disposed at a position overlapping the storage battery when viewed from the side of the vehicle. As a result, part of the impact load that is input to the rocker at the time of a side collision of the vehicle is transmitted to the storage battery via the first impact absorbing portion.

As described above, since the storage battery is set to have high rigidity, when an impact load is input to the storage battery, a reaction force is obtained from the storage battery. As a result, the first shock absorbing portion is plastically deformed and absorbs the shock energy. That is, it is possible to reduce the impact load even with a short stroke.

In addition, the impact load transmitted to the storage battery via the first impact absorbing portion of the rocker receives a reaction force from the storage battery, thereby suppressing the intrusion of the rocker inward in the vehicle width direction (so-called inward folding). can be done.

In addition, as a "storage battery", a lithium ion battery, a nickel-hydrogen battery, a silicon battery, etc. are mentioned, for example. Further, the "storage battery" here means, for example, a state in which a plurality of battery modules are accommodated in a case (hereinafter referred to as "battery pack").

Further, according to the present invention , the floor cross member extends across the vehicle width direction between the pair of rockers on the floor panel. On the other hand, a second impact absorbing portion is integrally formed with the outer portion and inner portion of the rocker. The second shock absorbing portion spans between the outer portion and the inner portion in the vehicle width direction in a state in which a gap is provided on the upper side and the lower side in the vehicle vertical direction in the closed cross-sectional portion of the rocker to connect them. It is provided at a position overlapping the floor cross member when viewed from the side of the vehicle.

In other words, the first impact absorbing portion and the second impact absorbing portion span the vehicle width direction in the closed cross-sectional portion of the rocker. The first shock absorbing portion and the second shock absorbing portion are integrally formed together with the outer portion and the inner portion. The impact absorbing portion is arranged at a position overlapping the floor cross member in a side view of the vehicle.

Therefore, in the event of a side collision of the vehicle, part of the impact load input to the rocker is transmitted to the storage battery side via the first impact absorbing portion and to the floor cross member side via the second impact absorbing portion. will be transmitted to When an impact load is input to the storage battery, a reaction force is obtained from the storage battery, and when an impact load is input to the floor cross member, the floor cross member (strictly speaking, the impact The reaction force is obtained from the rocker on the opposite side of the rocker to which the load is input. As a result, the first impact absorbing portion and the second impact absorbing portion are plastically deformed, and the impact energy is absorbed.

Further, here, in the event of a side collision of the vehicle, the load is transmitted to the storage battery side via the first impact absorbing portion of the rocker, and the load is transmitted to the floor cross member side via the second impact absorbing portion of the rocker. A load transfer path can be formed. Therefore, it is possible to distribute the impact load input to the rocker.

That is, in the present invention, the first shock absorbing portion and the second shock absorbing portion are provided in the closed cross-sectional portion of the rocker, and the first shock absorbing portion and the second shock absorbing portion correspond to the storage battery and the floor cloth when viewed from the side of the vehicle. Inward bending of the rocker is suppressed by arranging so as to overlap with the members and utilizing the reaction force from the storage battery and the floor cross member.

As described above, the vehicle lower portion structure according to the present invention according to claim 1 suppresses the residual crushing of the first impact member, thereby more effectively absorbing the impact energy and preventing the rocker from inward bending. It has an excellent effect that it can be suppressed.

1 is a plan view of a vehicle lower portion to which a vehicle lower portion structure according to a first embodiment is applied; FIG. FIG. 2 is a cross-sectional view taken along line 2-2 of FIG. 1; 4A and 4B are schematic diagrams showing in chronological order a state in which an impact load is input to a locker of a vehicle to which the vehicle lower structure according to the first embodiment is applied; FIG. (C) and (D) are schematic diagrams showing, in time series, states in which an impact load is input to a locker of the vehicle to which the vehicle lower structure according to the first embodiment is applied. (A) and (B) are comparative examples, and are schematic diagrams showing in time series a state in which an impact load is input to a locker of a vehicle. (C) and (D) are comparative examples, and are schematic diagrams showing in time series a state in which an impact load is input to a locker of a vehicle. FIG. 3 is a cross-sectional view corresponding to FIG. 2 showing a modification of the vehicle lower portion structure according to the first embodiment; FIG. 3 is a cross-sectional view corresponding to FIG. 2 showing a vehicle lower structure according to a second embodiment; FIG. 11 is a cross-sectional view corresponding to FIG. 2 showing a first modified example of the vehicle lower portion structure according to the second embodiment; FIG. 8 is a cross-sectional view corresponding to FIG. 2 showing a second modified example of the vehicle lower portion structure according to the second embodiment;

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

<First embodiment>
(Configuration of vehicle lower structure)

First, the structure of the vehicle lower part structure which concerns on this Embodiment is demonstrated. FIG. 1 shows a plan view of a vehicle lower portion 10 to which the vehicle lower portion structure according to the present embodiment is applied, and FIG. 2 shows a cross section taken along line 2-2 in FIG. A diagram is shown.

As shown in FIG. 1 , a floor panel 12 extends along the vehicle width direction and the vehicle front-rear direction on the vehicle lower portion 10 . The floor panel 12 has bead portions 12A intermittently protruding along the vehicle front-rear 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.

Further, rockers 14 and 16 extend in the longitudinal direction of the vehicle at both ends of the floor panel 12 in the vehicle width direction. A floor cross member (hereinafter simply referred to as "cross member") 18 spans across the width direction. The cross member 18 is arranged between the bead portions 12A arranged along the longitudinal direction of the vehicle.

As shown in FIG. 2, a battery pack (rechargeable battery) 20 is arranged below the floor panel 12 as a driving force supply device for supplying power to a power unit such as a motor.

As described above, the rockers 14 and 16 extend along the vehicle front-rear direction at both ends of the floor panel 12 in the vehicle width direction. A description of the lockers 14, 16 is provided below. Note that the locker 16 has substantially the same configuration as the locker 14, so a description thereof will be omitted.

As shown in FIG. 2, in the present embodiment, the rocker 14 includes an outer portion 22 located outside in the vehicle width direction and an inner portion 24 located inside in the vehicle width direction. . The rocker 14 is made of, for example, a metal such as an aluminum alloy, and an outer portion 22 and an inner portion 24 are integrally formed by extrusion or drawing. 26 are formed.

In a cross-sectional shape cut along the vehicle width direction, the outer portion 22 includes an outer wall portion 22A that is formed along the vertical direction, and an outer wall portion 22A that is provided on the upper side of the outer wall portion 22A and extends upward toward the inside in the vehicle width direction. and an inclined lower wall portion 22C provided on the lower side of the outer wall portion 22A and inclined downward toward the inside in the vehicle width direction. ing.

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

An inclined upper wall portion 24D is provided on the upper side of the upper inner wall portion 24A and inclined upward toward the outside in the vehicle width direction. 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. The flange portion 28 is connected to the lower end portion of a pillar (not shown).

In addition, a bottom wall portion 24E is provided on the lower side of the lower inner wall portion 24B and extends substantially horizontally toward the outside in the vehicle width direction. It is formed so as to be connected to the inclined lower wall portion 22C. A fastener 32 can be inserted through the bottom wall portion 24</b>E, and the fixing piece 30 provided on 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 areas of the closed cross-sectional portions of the upper portion 14A and the lower portion 14B of the rocker 14 are different. 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 of the lower portion 14B of the rocker 14 is set to be higher than that of the upper portion 14A.

A ladder-shaped impact absorbing portion (second impact absorbing portion) 38 is provided in the upper closed section portion 36 of the rocker 14, and the impact absorbing portion 38 overlaps the cross member 18 when viewed from the side of the vehicle. are arranged as A ladder-shaped shock absorbing portion (first shock absorbing portion) 40 is formed in the lower closed section portion 34 of the rocker 14, and the shock absorbing portion 40 overlaps the battery pack 20 when viewed from the side of the vehicle. are arranged as

Now, the impact absorbing portions 38 and 40 will be described respectively.
The shock absorbing portions 38 and 40 are formed integrally with the outer portion 22 and the inner portion 24 . The impact absorbing portion 38 includes an upper wall 38A that bridges between the upper inner wall portion 24A of the inner portion 24 and the outer wall portion 22A of the outer portion 22 along the 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 partitions the upper portion 14A and the lower portion 14B of the rocker 14. ing. In addition, the upper wall 38A and the lower wall 38B are vertically bridged by a plurality of (here, two) connecting walls 38C.

On the other hand, the impact absorbing portion 40 includes an upper wall 40A that bridges between the lower inner wall portion 24B of the inner portion 24 and the outer wall portion 22A of the outer portion 22 along the 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. Between the upper wall 40A and the lower wall 40B, a plurality of (here, three) connecting walls 40C are provided. It spans vertically.

(Action and effect of vehicle lower structure)
Next, the operation and effects of the vehicle lower portion structure according to the present embodiment will be described.

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

As a result, although not shown, for example, the strength of the rocker can be increased compared to the case where the rocker is formed by joining two panels, an outer portion and an inner portion, to each other. Also, when the rocker joins the two panels of the outer portion and the inner portion, welding or fastening is required. These processes become unnecessary, and the cost can be reduced accordingly.

Further, in the present embodiment, in the upper portion 14A (within the upper closed cross-section portion 36) of the rocker 14, the impact absorbing portion 38 is positioned between the outer portion 22 and the inner portion 24 so as to overlap the cross member 18 when viewed from the side of the vehicle. It spans across the width. In the lower portion 14B (within the lower closed section portion 34) of the rocker 14, a shock absorbing portion 40 extends in the vehicle width direction between the outer portion 22 and the inner portion 24 at a position overlapping the battery pack 20 as viewed from the side of the vehicle. It is

Therefore, 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 transferred to the cross member via the impact absorbing portion 38 provided on the upper portion 14A side of the rocker 14. 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 impact load (transmission load F1) is transmitted to the cross member 18 via the impact absorbing portion 38, the rocker 14 receives the impact load F via the cross member 18 (strictly speaking, the cross member 18). A reaction force N1 is obtained from the rocker 16 (see FIG. 1) on the opposite side of the rocker 14. Further, when an impact load (transmission load F2) is transmitted to battery pack 20 via impact absorbing portion 40, reaction force N2 is obtained from battery pack 20 in rocker . As a result, the impact absorbing portions 38 and 40 are plastically deformed and the impact energy is absorbed.

Here, for example, as shown in FIGS. 5A and 5B and FIGS. When the impact absorbing member 100 is arranged in the closed cross section 104 of the rocker 102, a rib 106 for restricting movement is provided in the closed cross section 104 in order to prevent the position of the impact absorbing member 100 from shifting due to impact. There is a need.

In this way, when the rib 106 for restricting movement is provided in the closed cross-sectional portion 104 of the rocker 102, when the impact load F is input to the rocker 102 and the impact absorbing member 100 is plastically deformed, the pressure in FIG. , (D), the rib 106 may inhibit the plastic deformation of the shock absorbing member 100 .

When the plastic deformation of the shock absorbing member 100 is inhibited in this manner, a so-called residual crushing portion 108 occurs, and the amount of impact energy absorbed by the rocker 102 is reduced by the residual crushing portion 108 . In other words, there is a possibility that impact energy cannot be efficiently absorbed.

On the other hand, in this embodiment, as shown in FIGS. Since it is formed, there is no need to provide a rib or the like as shown in FIG. 5(A). Therefore, in the present embodiment, as shown in FIGS. 4(C) and 4(D), it is possible to prevent the impact absorbing portion 40 from remaining after being crushed.

That is, it is possible to effectively absorb the impact energy due to the collision load F, and as a result, even if a large load is applied locally to the rocker 14 as in the case of a pole side collision, the rocker 14 is bent inward. can be suppressed. In other words, in the present embodiment, by suppressing the remaining portion of the shock absorbing portion 40 from being crushed, the impact energy can be absorbed more effectively, and the rocker 14 can be prevented from being bent inward.

In this embodiment, as shown in FIG. 2, shock absorbing portions 38 and 40 are provided in the closed section portion 26 of the rocker 14 . On the other hand, in FIGS. 3 and 4, only the impact absorbing portion 40 is provided in the closed cross-sectional portion 26 of the rocker 14, but this corresponds to the configuration of FIGS. 5 and 6 shown as a comparative example. , the impact absorbing portions 38 and 40 in the present embodiment are substantially the same, so illustration thereof is omitted.

By the way, in this embodiment shown in FIG. 2, as described above, when the impact load F is input to the rocker 14 at the time of a side collision of the vehicle, part of the impact load F is transferred to the upper portion 14A of the rocker 14. (Transmission load F1) is transmitted to the cross member 18 side via the shock absorbing portion 38 provided on the side of the rocker 14, and is transmitted to the battery pack 20 side via the shock absorbing portion 40 provided on the lower portion 14B side of the rocker 14. (Transmission load F2).

In other words, load transmission path A through which the load is transmitted to the cross member 18 side via the impact absorbing portion 38 of the rocker 14 and load transmission path A through which the load is transmitted to the battery pack 20 side via the impact absorbing portion 40 of the rocker 14. and B. As a result, the impact load F input to the rocker 14 can be distributed, and the ratio of load bearing between the upper portion 14A of the rocker 14 and the lower portion 14B of the rocker 14 can be changed.

Therefore, the impact load F2 transmitted to the battery pack 20 arranged 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 lowered by the amount that the impact load F2 transmitted to the battery pack 20 side is reduced. In this case, the thickness of the battery pack 20 can be reduced, and the weight of the battery pack 20 can be reduced. Moreover, since the board thickness of the battery pack 20 is reduced, the mounting amount of the battery modules 20A accommodated in the battery pack 20 can be increased.

(Supplementary matter of this embodiment)
In this embodiment, the shock absorbing portion 38 and the shock absorbing portion 40 are each formed in a ladder shape, but the shapes of the shock absorbing portion 38 and the shock absorbing portion 40 are not limited to this. For example, the shape can be appropriately changed in relation to the plate thickness, such as by forming the plate in a honeycomb shape by reducing the plate thickness. Further, the thickness of the shock absorbing portion 38 and the shock absorbing portion 40 may be changed, and the shape of the shock absorbing portion 38 and the shock absorbing portion 40 does not necessarily have to be the same.

Further, in the present embodiment, the rocker 14 is provided with a shock absorbing portion 38 at a position overlapping the cross member 18 when viewed from the side of the vehicle, and a shock absorbing portion 40 at a position overlapping the battery pack 20 when viewed from the side of the vehicle. However, the embodiment applied in the present invention is not limited to this.

For example, as shown in FIG. 7, some vehicles do not have a cross member 18 (see FIG. 2) on the floor panel 12. As shown in FIG. In this case, no impact absorbing portion is provided on the upper portion 42A side of the rocker 42, which overlaps the cross member 18 (see FIG. 2) when viewed from the side of the vehicle. Therefore, the shock absorbing portion (first shock absorbing portion) 40 is provided on the side of the lower portion 42B of the rocker 42. When the impact load F is input to the rocker 14 at the time of a side collision of the vehicle, the impact load F is transmitted to the battery pack 20 side via the impact absorbing portion 40 (transmission load F3).

Then, when an impact load (transmission load F3) is transmitted to battery pack 20 via impact absorbing portion 40, reaction force N3 is obtained from battery pack 20 in rocker 14. As shown in FIG. As a result, the impact absorbing portion 40 is plastically deformed, and the impact energy is absorbed even in this case.

<Second embodiment>
In the first embodiment described above, the battery pack 20 (see FIG. 2) is used as the driving force supply device for supplying electric power to the power unit. , a case where a hydrogen tank 44, which is a fuel cell, is used as a driving force supply device will be described. In addition, description is omitted about the structure substantially the same as 1st Embodiment. Embodiments applied in the present invention are not limited to this.

Here, in order to transmit the impact load input to the rocker to the side of the floor cross member arranged on the floor panel in the event of a side collision of the vehicle, the fuel cell is arranged on the vehicle lower side of the floor panel. In this case, it is possible to prevent an impact load from being input to the fuel cell side, which is preferable.

As shown in FIG. 8, in the present embodiment, the rocker 46 is provided with an impact absorbing portion 38 at a position (upper portion 46A side of the rocker 46) that does not overlap the hydrogen tank 44 when viewed from the side of the vehicle.

In this case, when the impact load F is input to the rocker 46 in the event of a side collision of the vehicle, part of the impact load F is transferred to the cross member via the impact absorbing portion 38 provided on the upper portion 46A side of the rocker 46. 18 side (transmission load F4). When the impact load (transmission load F4) is transmitted to the cross member 18 via the impact absorbing portion 38, the rocker 46 receives a reaction force N4 from the cross member 18. As shown in FIG. As a result, the impact absorbing portion 38 is plastically deformed and the impact energy is absorbed.

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

(Supplementary matter of this embodiment)
In the above embodiment, as shown in FIG. 1, the cross member 18 spans between the rockers 14 and 16. For example, as shown in FIG. In some cases, the hydrogen tank 47 is arranged along the vehicle front-rear direction below the tunnel portion 50 that protrudes along the vehicle front-rear direction from the center portion of the floor panel 48 in the vehicle width direction.

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

For example, although not shown, the cross member may be divided by the tunnel portion and provided two along the width direction of the vehicle. However, in this case, one longitudinal end of the cross member is coupled to the rocker, and the other longitudinal end of the cross member is coupled to the tunnel portion. Therefore, the impact load transmitted from the rocker to the cross member receives a reaction force from the tunnel portion.

Further, in the above embodiment, the vehicle using the battery pack 20 (see FIG. 2) and the hydrogen tank 44 (see FIG. 8) as the driving force supply device has been described, but the present embodiment is applicable to a gasoline vehicle. is also applicable.

In the case of a gasoline vehicle, for example, as shown in FIG. 10, since there is no need to dispose a driving force supply device below the floor panel 56, the position of the floor panel 56 in the vertical direction is set low. be able to. For this reason, the cross member 58 arranged on the floor panel 56 and the impact absorbing portion (first impact absorbing portion) 60 provided so as to overlap with each other when viewed from the side of the vehicle are provided on the lower portion 62A side of the rocker 62 . Become.

An example of the embodiment of the present invention has been described above, but the embodiment of the present invention is not limited to the above. It goes without saying that various aspects can be implemented without departing from the gist of the above.

10 vehicle lower part (vehicle lower part structure)
12 floor panel 14 rocker 16 rocker 18 cross member (floor cross member)
20 battery pack (storage battery)
22 Outer part (rocker)
24 Inner part (rocker)
26 Closed section 38 Shock absorbing part (first shock absorbing part, second shock absorbing part, rocker)
40 shock absorbing part (first shock absorbing part, rocker)
42 rocker 46 rocker 48 floor panel 52 cross member 54 rocker 56 floor panel 58 cross member (floor cross member)
60 shock absorbing part (first shock absorbing part)
62 Rocka

Claims (1)

A pair of rockers arranged on both sides of a vehicle floor panel in the vehicle width direction and extending in the vehicle front-rear direction,
an outer portion located outside in the vehicle width direction;
an inner portion integrally formed with the outer portion, positioned inside in the vehicle width direction, and forming a closed cross-sectional portion together with the outer portion;
It is integrally formed with the outer portion and the inner portion, and spans between the outer portion and the inner portion in the vehicle width direction in a state in which a gap is provided on the upper side and the lower side in the vehicle vertical direction in the closed cross-section portion. a first shock absorbing portion that connects the two,
consists of
A storage battery is arranged on the vehicle lower side of the floor panel, and the first shock absorbing portion is arranged at a position overlapping the storage battery when viewed from the side of the vehicle,
On the floor panel, a floor cross member is disposed between the pair of rockers and spans along the vehicle width direction, and is integrally formed with the outer portion and the inner portion, and extends in the vehicle vertical direction within the closed cross-sectional portion. A second shock absorbing portion spans between the outer portion and the inner portion in the vehicle width direction to connect the outer portion and the inner portion with a gap provided on the upper side and the lower side. A vehicle lower structure provided at a position overlapping with the floor cross member in view .

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