JP2018095137A - Vehicle body floor structure - Google Patents

Abstract

PROBLEM TO BE SOLVED: To efficiently perform energy absorption at the time of side collision even when the weight of a cross member is reduced.SOLUTION: On a portion of a front cross member 32 outside in a vehicle width direction across a fragile part 36 and a portion of a front cross member 32 inside in the vehicle width direction, an outside reinforcement member 20 and an inside reinforcement member 22 reinforcing parts on a first ridge line 3210 and a second ridge line 3212 on these portions are mounted. Even when the fragile part 36 is deformed at the time of side collision and the cracks are generated on the first ridge line 3210 and the second ridge line 3212 on the fragile part 36, the generated cracks are prevented from developing to the outside and the inside in the vehicle width direction along the first ridge line 3210 and the second ridge line 3212 because the portions of the first ridge line 3210 and the second ridge line 3212 are reinforced by the outside reinforcement member 20 and the inside reinforcement member 22.SELECTED DRAWING: Figure 2

Description

  The present invention relates to a vehicle body floor structure.

2. Description of the Related Art A vehicle body floor structure is known that includes a cross member that extends in a vehicle width direction along a floor panel and has an end on the outer side in the vehicle width direction connected to a side sill.
In such a vehicle body floor structure, a fragile portion that induces deformation is provided at a position on the inner side in the vehicle width direction than the end portion on the outer side in the vehicle width direction of the cross member, and the collision energy at the time of a side collision is efficiently absorbed by the fragile portion, This is advantageous in appropriately protecting the vehicle functional components disposed inside the vehicle and appropriately protecting the occupant (see Patent Document 1).
However, when the fragile part is deformed at the time of a side collision, a crack occurs in the ridge line portion of the cross member that follows the fragile part, and if this crack propagates along the ridge line to the outside and inside in the vehicle width direction, the energy absorption by the cross member There is a concern that the performance will decrease.
In particular, when the cross member is formed of a material having high tensile strength in order to reduce the weight (thinning) of the cross member, since the elongation of the material is small, the development of cracks along the ridge line tends to be remarkable.

JP 2013-119111 A

  The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a vehicle body floor structure that is advantageous in efficiently absorbing energy at the time of a side collision even if the weight of a cross member is reduced. And

In order to achieve the above object, the invention according to claim 1 includes a cross member extending inwardly of the vehicle width from the side sill, the cross member including a ridge line extending in the vehicle width direction, and a vehicle width outward direction. Vehicle body floor structure provided with a weak portion provided near the end of the vehicle, wherein the cross member is located on the outer side in the vehicle width direction and the cross member on the inner side in the vehicle width direction, sandwiching the weak portion in the vehicle width direction. An outer reinforcing member and an inner reinforcing member that reinforce the portion of the ridge line at those locations are provided respectively.
The invention according to claim 2 is characterized in that the outer reinforcing member and the inner reinforcing member are formed of a material having a larger elongation than the cross member.
The invention according to claim 3 is characterized in that an outer end portion of the outer reinforcing member in the vehicle width direction is connected to a side sill.
The invention according to claim 4 is characterized in that the outer reinforcing member and the inner reinforcing member are connected and integrated through a weakened portion for reinforcing member.
The invention according to claim 5 is characterized in that the outer reinforcing member reinforces a portion of a front cross member to which a bracket for seat attachment is attached.
According to a sixth aspect of the present invention, the cross member has a plurality of surface portions extending in the vehicle width direction while facing different directions, and the ridge line is in the vehicle width direction at a boundary between the adjacent surface portions. The outer reinforcing member and the inner reinforcing member have a plurality of surface portions that are respectively overlapped with the respective surface portions of the cross member, and the outer reinforcing member and the plurality of surface portions of the inner reinforcing member Are overlapped on the respective surface portions of the cross member and spot welded at the overlapped portions.
According to a seventh aspect of the present invention, the outer reinforcing member and the inner reinforcing member are disposed inside a cross section of the cross member, and the inner side of the outer reinforcing member faces the inner side in the vehicle width direction. An inner abutting surface portion is provided, and an outer abutting surface portion facing outward in the vehicle width direction is provided at an end portion of the inner reinforcing member on the outer side in the vehicle width direction.
According to an eighth aspect of the present invention, the outer reinforcing member and the inner reinforcing member are disposed inside a cross section of the cross member, and the outer reinforcing member and the inner reinforcing member are provided on the upper surface portion and the upper surface portion, respectively. One of the outer reinforcing member and the inner reinforcing member, having a front surface portion connected via a ridge line and facing the front of the vehicle, and a rear surface portion connected to the upper surface portion via a ridge line and facing the rear of the vehicle Between the end of the upper surface facing the other reinforcing member and the end of the front surface facing the other reinforcing member, and the end of the upper surface facing the other reinforcing member An inclined surface portion that connects the surface portions is provided between the portion facing the other reinforcing member of the rear surface portion.

According to the first aspect of the present invention, even if the fragile portion is deformed at the time of a side collision and a crack occurs in the ridge line in the fragile portion, the portion of the ridge line is reinforced by the outer reinforcing member and the inner reinforcing member. It is suppressed that the crack which generate | occur | produced progresses to the outer side and inner side of a vehicle width direction along a ridgeline.
Therefore, even if the cross member is formed of a material having high tensile strength to reduce the weight, it is advantageous to efficiently absorb the energy at the time of the side collision with the cross member.
According to the second aspect of the present invention, the fragile portion is deformed at the time of a side collision, and when the ridge line is cracked at the fragile portion, the outer reinforcing member and the inner reinforcing member follow the deformation of the cross member and extend well. Therefore, it is more advantageous in suppressing the generated cracks from extending outward and inward in the vehicle width direction along the ridgeline.
According to the third aspect of the present invention, it is possible to stably transmit the collision energy applied to the side sill at the time of a side collision to the fragile portion via the outer reinforcing member, which is advantageous in efficiently absorbing the energy at the side collision by the fragile portion. It becomes.
According to the fourth aspect of the present invention, it is advantageous in simplifying the attachment of the outer reinforcing member and the inner reinforcing member to the cross member and reducing the component cost.
According to the fifth aspect of the present invention, the reinforcing member dedicated to the seat mounting bracket can be omitted, which is advantageous in reducing the number of parts and reducing the part cost.
According to the sixth aspect of the invention, it is advantageous for reliably reinforcing the plurality of ridge lines of the cross member, and it is possible to suppress the occurrence of the generated cracks along the plurality of ridge lines outward and inward in the vehicle width direction. This is more advantageous.
According to invention of Claim 7, 8, it becomes more advantageous when suppressing the crack which generate | occur | produced in the weak part progresses to the outer side and inner side of a vehicle width direction along a ridgeline.

It is a perspective view which shows the structure of the vehicle body floor structure of embodiment. (A) is an exploded perspective view showing a front cross member, an outer reinforcing member and an inner reinforcing member, and (B) is a perspective view showing a state where the outer reinforcing member and the inner reinforcing member are attached to the front cross member. (A) is the XX sectional view taken on the line of FIG. 2 (B), (B) is the YY sectional view taken on the line of FIG. 2 (B). (A) is a perspective view which shows the modification of an outer reinforcement member and an inner reinforcement member, (B) is a perspective view which shows the other modification of an outer reinforcement member and an inner reinforcement member. It is explanatory drawing which shows the generation | occurrence | production mechanism of the deformation | transformation of the front cross member by a side collision, and the crack growth along a ridgeline, (A) shows the state before a deformation | transformation, (B) is the surface parts of the cross member which pinches | interposes a weak part Shows a case where the cross members are deformed so as to pass each other, and (C) shows a case where the surface portions of the cross member sandwiching the fragile portion are deformed in the same direction.

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
In the following drawings, the symbol FR indicates the front in the vehicle front-rear direction, the symbol RH indicates the vehicle width direction, and the symbol UPR indicates the vehicle upper direction.
As shown in FIG. 1, the vehicle body floor structure 10 of the present embodiment includes a pair of side members 12, a floor panel 14, a pair of cross members 16, a pair of side sills 18, an outer reinforcing member 20, The reinforcing member 22 is included.
A pair of side members 12 are provided at intervals in the vehicle width direction, and each side member 12 includes a front side member 12A, a floor side member 12B, and a rear side member 12C.
The pair of floor side members 12B extends rearward from both sides of the dash panel 24 in the vehicle width direction, and a rear seat cross member 26 is located at the rear of the floor side member 12B.

The floor panel 14 includes a front floor panel 14A and a rear floor panel 14B.
The front floor panel 14 </ b> A is provided on the pair of floor side members 12 </ b> B and connects the dash panel 24 and the rear seat cross member 26.
The rear floor panel 14B extends rearward from the rear seat cross member 26 on the pair of rear side members 12C, and is positioned above the front floor panel 14A.

A floor tunnel 28 that is convex upward and extends in the vehicle front-rear direction is provided at the center of the front floor panel 14A in the vehicle width direction.
A reinforcing member 30 extending in the vehicle front-rear direction is attached to the upper portion of the floor tunnel 28. For example, an exhaust pipe and a drive shaft are accommodated inside the floor tunnel 28.

The cross member 16 is provided on the upper surface of the front floor panel 14A and extends in the vehicle width direction on both sides in the vehicle width direction of the floor tunnel 28. The cross member 16 includes a front cross member 32 and a center cross located behind the front cross member 32. And a member 34.
The front cross member 32 is a place where front mounting brackets (not shown) of seat slide rails on both sides in the vehicle width direction of the driver seat and the passenger seat are attached, and the center cross member 34 is a vehicle for the driver seat and the passenger seat. This is where the rear mounting brackets (not shown) on both sides of the seat slide rail are attached.
The ends of the front cross member 32 and the center cross member 34 on the inner side in the vehicle width direction are attached to the floor tunnel 28, and the portion near the outer end in the vehicle width direction is attached to the front side member 12A via the front floor panel 14A. The outer end of the vehicle width direction is attached to the side sill 18.
The side sill 18 is attached to the outer end in the vehicle width direction of the front floor panel 14A and the outer end in the vehicle width direction of the cross member 16 and extends in the vehicle front-rear direction.
An end portion of the side sill 18 on the front side of the vehicle is attached to a lower end of the dash panel 24, and an end portion on the rear side of the vehicle is attached to the rear seat cross member 26.

As shown in FIG. 2A, the front cross member 32 has a plurality of surface portions extending in the vehicle width direction while facing different directions, and has an open cross section below.
That is, the front cross member 32 is connected to the front surface portion 3202 facing the front of the vehicle, the upper surface portion 3204 connected to the upper end of the front surface portion 3202 and facing upward, and the rear end of the upper surface portion 3204 and facing the rear of the vehicle. A rear surface portion 3206, a flange 3207 provided at the lower end of the front surface portion 3202 and the rear surface portion 3206, and attached to the front floor panel 14A, and a side sill 18 provided at the outer end in the vehicle width direction of the front surface portion 3202 and the rear surface portion 3206. A flange 3208 to be attached and a flange 3209 to be attached to the side sill 18 provided at the outer end in the vehicle width direction of the upper surface portion 3204.
And the location of the boundary between the front surface portion 3202 and the upper surface portion 3204 is a first ridge line 3210, and the location of the boundary between the upper surface portion 3204 and the rear surface portion 3206 is a second ridge line 3212. 3210 and the second ridge line 3212 extend in the vehicle width direction along the front cross member 32.

A weakened portion 36 is provided at a location near the end of the front cross member 32 outside the vehicle width.
The fragile portion 36 efficiently absorbs the collision energy at the time of a side collision, appropriately protects the vehicle functional component disposed inside the vehicle, and appropriately protects the occupant.
The fragile portion 36 is configured to induce deformation compared to other portions of the front cross member 32.
The fragile portion 36 is provided on the front surface portion 3202 and the rear surface portion 3206 and is displaced on the inner side of the front cross member 32. The upper displacement portion 3604 is disposed on the upper surface portion 3204 and is displaced above the front cross member 32. It is comprised including.

As shown in FIGS. 2 (A) and 2 (B), the outer reinforcing member 20 and the inner reinforcing member 22 are arranged in the vehicle width direction outside front cross member 32 and the vehicle width direction inner side sandwiching the fragile portion 36 in the vehicle width direction. The front cross member 32 is provided so as to reinforce the ridge line portions of these portions.
The outer reinforcing member 20 and the inner reinforcing member 22 are formed of a material that is larger than the front cross member 32.
An end of the outer reinforcing member 20 on the outer side in the vehicle width direction is connected to the side sill 18.
The outer reinforcing member 20 and the inner reinforcing member 22 are connected and integrated via a reinforcing member weakened portion 38.

The outer reinforcing member 20 and the inner reinforcing member 22 are disposed on the inner side of the cross section of the cross member 16 and have a plurality of surface portions that are overlapped and attached to the respective surface portions of the cross member 16.
That is, the outer reinforcing member 20 has a front surface portion 2002, an upper surface portion 2004, and a rear surface portion 2006, and the inner reinforcing member 22 has a front surface portion 2202, an upper surface portion 2204, and a rear surface portion 2206 in the same manner as the outer reinforcing member 20. Have.
The outer reinforcing member 20 and the inner reinforcing member 22 may be arranged outside the cross section of the cross member 16, but if arranged inside like this, there is no problem of narrowing the space on the floor panel 14, and the It is advantageous in laying out various members and parts provided in the case.
The plurality of surface portions of the outer reinforcing member 20 and the inner reinforcing member 22 are overlapped with each surface portion of the front cross member 32, and are spot welded at the overlapped portions.
That is, as shown in FIGS. 2A, 2 </ b> B, 3 </ b> A, and 3 </ b> B, the front surface portion 2002, the upper surface portion 2004, and the rear surface portion 2006 of the outer reinforcing member 20 are the vehicle width of the fragile portion 36. At the position of the front cross member 32 on the outer side in the direction, the front cross member 32 is superposed on the inner side of the front surface portion 3202, the upper surface portion 3204, and the rear surface portion 3206, and is spot welded.
Further, the front portion 2202, the upper surface portion 2204, and the rear surface portion 2206 of the inner reinforcing member 22 are located at the front cross member 32 on the inner side in the vehicle width direction of the fragile portion 36, the front surface portion 3202, the upper surface portion 3204, They are superimposed on the inside of the rear surface portion 3206 and spot welded respectively.
Further, the weakened portion 38 for reinforcing member is not spot welded to the weakened portion 36 and the upper surface portion 3204 of the corresponding front cross member 32.
In FIGS. 2B and 3B, the symbol * indicates a spot welded portion.
The front mounting member of the seat slide rail on the outer side in the vehicle width direction among the front mounting brackets of the seat slide rail on both sides in the vehicle width direction of the driver seat and the passenger seat is provided at the position of the front cross member 32 provided with the outer reinforcing member 20. The outer reinforcing member 20 is provided to reinforce the first ridgeline 3210 and the second ridgeline 3212, and to the front cross member 32 to which the front mounting bracket of the seat slide rail on the outer side in the vehicle width direction of the driver seat and the passenger seat is attached. This part is also reinforced.

As shown in FIGS. 2A and 2B, the weakened portion 38 for reinforcing member has only an upper surface portion 3802 having a width smaller than that of the upper surface portion 2004 of the outer reinforcing member 20 and the upper surface portion 2204 of the inner reinforcing member 22. In addition, it is formed in an upward convex shape corresponding to the upper displacement portion 3604 and is configured to induce deformation compared to the outer reinforcing member 20 and the inner reinforcing member 22.
The weakened portion 38 for the reinforcing member is disposed at a position corresponding to the weakened portion 36 of the cross member 16 so as not to inhibit the deformation of the weakened portion 36 at the time of a side collision.

Next, the function and effect will be described.
First, as shown in FIG. 5A, a case where the inner reinforcing member 22 and the outer reinforcing member 20 are not provided on the front cross member 32 having the fragile portion 36 will be described.
In this case, when the vehicle collides sideways and an impact load is applied from the side sill 18 to the outer end of the front cross member 32 in the vehicle width direction, the fragile portion 36 is deformed, and the first ridgeline 3210 and the second ridgeline 3210 at the fragile portion 36 are deformed. There is a concern that a crack occurs in the ridge line 3212 and that the crack propagates from the fragile portion 36 to the outside and the inside in the vehicle width direction along the first ridge line 3210 and the second ridge line 3212.
The following two types of modes are assumed as the progress of such cracks.

(1) As shown in FIG. 5B, among the upper surface portion 3204 of the front cross member 32 sandwiching the fragile portion 36, for example, the upper surface portion 3204 on the outer side in the vehicle width direction is deformed downward and the inner side in the vehicle width direction. The upper surface portion 3204 of the upper portion is deformed upward.
Of the front surface portion 3202 and the rear surface portion 3206 of the front cross member 32 sandwiching the fragile portion 36, for example, the front surface portion 3202 and the rear surface portion 3206 on the outer side in the vehicle width direction are deformed inward of the front cross member 32 and the vehicle. The front surface portion 3202 and the rear surface portion 3206 on the inner side in the width direction are deformed outward of the front cross member 32.
Thus, the first ridgeline 3210 and the second ridgeline 3212 in the fragile portion 36 are deformed so that the upper surface portions 3204, the front surface portions 3202 and the rear surface portions 3206 of the front cross member 32 sandwiching the fragile portion 36 pass each other. A crack is generated in the vehicle, and the generated crack propagates from the fragile portion 36 to the outside and the inside in the vehicle width direction along the first ridge line 3210 and the second ridge line 3212.

(2) As shown in FIG. 5C, of the upper surface portion 3204 of the front cross member 32 sandwiching the fragile portion 36, both the upper surface portion 3204 on the outer side in the vehicle width direction and the upper surface portion 3204 on the inner side in the vehicle width direction It is deformed above the front cross member 32.
Of the front surface portion 3202 and the rear surface portion 3206 of the front cross member 32 sandwiching the fragile portion 36, both the front surface portion 3202 outside the vehicle width direction and the front surface portion 3202 inside the vehicle width direction are inward of the front cross member 32. And the rear surface portion 3206 on the outer side in the vehicle width direction and the rear surface portion 3206 on the inner side in the vehicle width direction are deformed inward of the front cross member 32.
As described above, the upper surface portions 3204, the front surface portions 3202, and the rear surface portions 3206 of the front cross member 32 sandwiching the fragile portion 36 are deformed in the same direction, so that the first ridge line 3210 and the second ridge line 3212 in the fragile portion 36. A crack is generated in the vehicle, and the generated crack propagates from the fragile portion 36 to the outside and the inside in the vehicle width direction along the first ridge line 3210 and the second ridge line 3212.

When the crack generated from the fragile portion 36 at the time of a side collision as described above progresses outward and inward in the vehicle width direction along the first ridge line 3210 and the second ridge line 3212, the energy absorption performance by the front cross member 32 is deteriorated. End up.
In particular, when the cross member 16 is formed of a material having a high tensile strength in order to reduce the weight (thinning), there is a disadvantage that the progress of the crack along the ridge line becomes remarkable because the material has a small elongation.

On the other hand, in the present embodiment, the front cross member 32 on the outer side in the vehicle width direction and the front cross member 32 on the inner side in the vehicle width direction sandwiching the fragile portion 36 in the vehicle width direction, The outer reinforcing member 20 and the inner reinforcing member 22 that reinforce portions of the first ridge line 3210 and the second ridge line 3212 are provided.
Therefore, even if the fragile portion 36 is deformed at the time of a side collision and cracks occur in the first ridge line 3210 and the second ridge line 3212 in the fragile portion 36, the first ridge line 3210 and the first ridge line 3210 Since the portion of the two ridge lines 3212 is reinforced, the generated crack is suppressed from extending along the first ridge line 3210 and the second ridge line 3212 to the outside and the inside in the vehicle width direction.
Therefore, even if the front cross member 32 is formed of a material having high tensile strength to reduce the weight, it is advantageous in efficiently absorbing the energy at the time of a side collision by the front cross member 32.

In the present embodiment, the outer reinforcing member 20 and the inner reinforcing member 22 are formed of a material that is larger in elongation than the front cross member 32.
Therefore, compared with the case where the outer reinforcing member 20 and the inner reinforcing member 22 are formed of the same or smaller material as that of the front cross member 32, the fragile portion 36 is deformed at the time of a side collision, and the first ridge line is formed at the fragile portion 36. When cracks occur in the 3210 and the second ridgeline 3212, the outer reinforcing member 20 and the inner reinforcing member 22 extend well following the deformation of the front cross member 32, so that the generated crack is the first ridgeline 3210 and the second ridgeline 3212. This is more advantageous for suppressing the vehicle from extending outward and inward in the vehicle width direction along the ridgeline 3212.

  In the present embodiment, since the end of the outer reinforcing member 20 on the outer side in the vehicle width direction is connected to the side sill 18, the collision energy applied to the side sill 18 at the time of a side collision collides with the fragile portion 36 via the outer reinforcing member 20. Therefore, it is advantageous to efficiently absorb energy at the time of a side collision by the fragile portion 36.

  In the present embodiment, since the outer reinforcing member 20 and the inner reinforcing member 22 are connected and integrated via the weakened portion 38 for reinforcing member, the outer reinforcing member 20 and the inner reinforcing member 22 are separated. Compared with the case where it comprises, it becomes advantageous when aiming at simplification of the attachment to the front cross member 32 of the outer reinforcement member 20 and the inner reinforcement member 22, and reduction of components cost.

  Further, in the present embodiment, the outer reinforcing member 20 reinforces the position of the front cross member 32 to which the front mounting bracket of the seat slide rail is attached, so that the reinforcing member dedicated to the front mounting bracket of the seat slide rail can be omitted. This is advantageous in reducing the number of parts and reducing the part cost.

In the present embodiment, the front portion 3202, the upper surface portion 3204, and the rear surface portion 3206 of the outer reinforcing member 20 and the inner reinforcing member 22 are overlapped with the front surface portion 3202, the upper surface portion 3204, and the rear surface portion 3206 of the front cross member 32, respectively. And spot welded at the overlapped points.
Therefore, it is advantageous to surely reinforce the first ridgeline 3210 and the second ridgeline 3212 of the front cross member 32, and the generated cracks along the first ridgeline 3210 and the second ridgeline 3212 are outside and inside in the vehicle width direction. It becomes more advantageous in suppressing the progress to.

Next, a modified example will be described with reference to FIGS.
In the modification shown in FIG. 4A, one reinforcing member of the outer reinforcing member 20 and the inner reinforcing member 22 is opposed to the other reinforcing member on the front surface portion and the end portion facing the other reinforcing member on the upper surface portion. An inclined surface portion is provided between the end portions and between an end portion of the upper surface portion facing the other reinforcing member and an end portion of the rear surface portion facing the other reinforcing member.
In other words, in this modification, between the end on the outer side in the vehicle width direction of the upper surface portion 2204 of the inner reinforcing member 22 and the outer end in the vehicle width direction on the front surface portion 2202, and on the outer side in the vehicle width direction of the upper surface portion 2204. Between the end portion and the end portion on the outer side in the vehicle width direction of the rear surface portion 2206, an inclined surface portion 2208 that is inclined obliquely outward in the vehicle width direction is provided.
When the inclined surface portion 2208 is deformed so that the upper surface portions 3204, the front surface portions 3202 and the rear surface portions 3206 of the front cross member 32 sandwiching the fragile portion 36 pass each other, the inclined surface portion 2208 and the outer reinforcing member 20 are arranged in a vehicle. The end portion on the inner side in the width direction comes into contact with the surface, suppresses the passing between the upper surface portions 3204, the front surface portions 3202, and the rear surface portions 3206, and the generated cracks follow the first ridge line 3210 and the second ridge line 3212. It is advantageous in suppressing the progress to the outside and inside of the direction.
Such an inclined surface portion may be provided on at least one of the inner reinforcing member 22 or the outer reinforcing member 20.
In this modified example, the reinforcing member weakened portion 38 may be omitted, and the outer reinforcing member 20 and the inner reinforcing member 22 may be separated.

In the modification shown in FIG. 4B, an inner contact surface portion 2010 facing inward in the vehicle width direction is provided at the inner end in the vehicle width direction of the outer reinforcing member 20, and the outer side in the vehicle width direction of the inner reinforcing member 22 is provided. Is provided with an outer abutment surface portion 2210 facing outward in the vehicle width direction.
The inner contact surface portion 2010 and the outer contact surface portion 2210 contact each other when the upper surface portions 3204, the front surface portions 3202 and the rear surface portions 3206 of the front cross member 32 sandwiching the weakened portion 36 are deformed so as to pass each other. The upper surface 3204, the front surface 3202, and the rear surface 3206 are prevented from passing each other, and the generated cracks propagate along the first ridge line 3210 and the second ridge line 3212 outward and inward in the vehicle width direction. This is advantageous in terms of suppression.
In this modification, the case where the inner contact surface portion 2010 and the outer contact surface portion 2210 are provided on the front surface portions 2002, 2202 and the rear surface portions 2006, 2206, respectively, has been described. The contact surface portion 2210 may be provided on the upper surface portions 2004 and 2204.
In this modified example, the reinforcing member weakened portion 38 may be omitted, and the outer reinforcing member 20 and the inner reinforcing member 22 may be separated.

In the present embodiment, the front cross member 32 has three surface portions such as a front surface portion 3202, an upper surface portion 3204, and a rear surface portion 3206, a first ridge line 3210 at the boundary between the front surface portion 3202 and the upper surface portion 3204, and an upper surface portion 3204. The second ridgeline 3212 at the boundary between the rear surface portion 3206 and the rear surface portion 3206 has been described. However, the front cross member 32 may have a plurality of surface portions, and the ridgeline extends to the boundary between the adjacent surface portions. The present invention is applicable to the front cross members 32 having various shapes that are conventionally known.
Further, in the present embodiment, the case where the front cross member 32 is provided on the upper surface of the floor panel 14 has been described, but the present invention is similarly applied to the case where the front cross member 32 is provided on the lower surface of the floor panel 14. Applied.
In the present embodiment, one outer reinforcing member 20 reinforces both the first ridge line 3210 and the second ridge line 3212, and one inner reinforcing member 22 has both the first ridge line 3210 and the second ridge line 3212. The case of reinforcing the above has been described.
However, the outer reinforcing member 20 that reinforces the first ridge line 3210 and the outer reinforcing member 20 that reinforces the second ridge line 3212 may be separated from each other, and the inner reinforcing member 22 that reinforces the first ridge line 3210 and The inner reinforcing member 22 that reinforces the second ridgeline 3212 may be separated from each other.
In the present embodiment, the case where the present invention is applied to the front cross member 32 has been described. However, the present invention may be applied to the center cross member 34 and can be widely applied to the cross member. It is.

DESCRIPTION OF SYMBOLS 10 Vehicle body floor structure 12 Side member 12A Front side member 14 Floor panel 14A Front floor panel 16 Cross member 18 Side sill 20 Outer reinforcement member 2002 Front surface part 2004 Upper surface part 2006 Rear surface part 22 Inner reinforcement member 2202 Front surface part 2204 Upper surface part 2206 Rear surface part 2208 Inclined surface portion 32 Front cross member 3202 Front surface portion 3204 Upper surface portion 3206 Rear surface portion 3210 First ridge line 3212 Second ridge line 36 Weak portion

Claims (8)

It has a cross member that extends inward from the side sill,
The cross member is a vehicle body floor structure including a ridge line extending in the vehicle width direction and a fragile portion provided at a location near an end portion outside the vehicle width,
An outer reinforcement member and an inner reinforcement that reinforces the portion of the ridge line at the location of the cross member outside the vehicle width direction and the location of the cross member inside the vehicle width direction sandwiching the fragile portion in the vehicle width direction Each member is provided,
Body floor structure characterized by that. The outer reinforcing member and the inner reinforcing member are formed of a material having a larger elongation than the cross member,
The vehicle body floor structure according to claim 1. An end of the outer reinforcing member on the outer side in the vehicle width direction is connected to a side sill.
The vehicle body floor structure according to claim 1 or 2, wherein The outer reinforcing member and the inner reinforcing member are connected and integrated via a weakened portion for reinforcing member,
The vehicle body floor structure according to any one of claims 1 to 3, wherein The outer reinforcing member reinforces the position of the front cross member to which the bracket for mounting the seat is attached.
The vehicle body floor structure according to any one of claims 1 to 4, wherein the vehicle body floor structure is provided. The cross member has a plurality of surface portions extending in the vehicle width direction while facing different directions.
The ridge line extends in the vehicle width direction at the boundary between the adjacent surface portions,
The outer reinforcing member and the inner reinforcing member have a plurality of surface portions respectively overlapped with the surface portions of the cross member,
The plurality of surface portions of the outer reinforcing member and the inner reinforcing member are respectively overlapped with the respective surface portions of the cross member, and are spot welded at the overlapped portions, respectively.
The vehicle body floor structure according to any one of claims 1 to 5, wherein The outer reinforcing member and the inner reinforcing member are disposed inside a cross section of the cross member,
An inner abutting surface portion facing inward in the vehicle width direction is provided at the inner end in the vehicle width direction of the outer reinforcing member,
An outer abutment surface portion facing outward in the vehicle width direction is provided at an end of the inner reinforcing member on the outer side in the vehicle width direction.
The vehicle body floor structure according to any one of claims 1 to 5, wherein The outer reinforcing member and the inner reinforcing member are disposed inside a cross section of the cross member,
The outer reinforcing member and the inner reinforcing member are respectively connected to an upper surface portion, a front surface portion connected to the upper surface portion via a ridge line and facing the front of the vehicle, and connected to the upper surface portion via a ridge line and behind the vehicle. And a rear part facing
Between one of the outer reinforcing member and the inner reinforcing member, between an end portion of the upper surface portion facing the other reinforcing member and an end portion of the front surface portion facing the other reinforcing member, and An inclined surface portion is provided between the end portion of the upper surface portion facing the other reinforcing member and the end portion of the rear surface portion facing the other reinforcing member, and connecting these surface portions.
The vehicle body floor structure according to any one of claims 1 to 5, wherein

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