JP6919187B2 - Body floor structure - Google Patents

Description

The present invention relates to a vehicle body floor structure.

A vehicle body floor structure is known that includes a cross member that extends along the floor panel in the vehicle width direction and has an outer end 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 portion inside the vehicle width direction rather than the outer end portion 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. It is advantageous in appropriately protecting the functional parts for vehicles arranged inside the vehicle and appropriately protecting the occupants (see Patent Document 1).
However, when the fragile portion is deformed during a side collision, a crack is generated in the ridgeline portion of the cross member following the fragile portion, and when this crack extends outward and inward in the vehicle width direction along the ridgeline, energy is absorbed by the cross member. There is a concern that the performance will deteriorate.
In particular, when the cross member is formed of a material having high tensile strength in order to reduce the weight (thinness) of the cross member, the elongation of the material is small, so that the growth of cracks along the ridge line tends to be remarkable.

Japanese Unexamined Patent Publication No. 2013-119311

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 which is advantageous in efficiently absorbing energy at the time of a side collision even if the weight of the cross member is reduced. And.

In order to achieve the above object, the present invention includes a cross member extending inward of the vehicle width from the side sill, and the cross member has a ridge line extending in the vehicle width direction and an end portion outside the vehicle width. In the vehicle body floor structure including the fragile portion provided at the above-mentioned portion, the cross member portion on the outer side in the vehicle width direction and the cross member portion on the inner side in the vehicle width direction sandwiching the fragile portion in the vehicle width direction. It is characterized in that an outer reinforcing member and an inner reinforcing member, which are arranged adjacent to the fragile portion and reinforce the portion of the ridgeline of those portions, are provided, respectively.
Further, the present invention is characterized in that the outer reinforcing member and the inner reinforcing member are made of a material having a larger elongation than the cross member.
Further, the present invention is characterized in that the outer end portion of the outer reinforcing member in the vehicle width direction is connected to the side sill.
Further, the present invention is characterized in that the outer reinforcing member and the inner reinforcing member are connected and integrated via a fragile portion for the reinforcing member.
Further, the present invention is characterized in that the outer reinforcing member reinforces a portion of a front cross member to which a bracket for attaching a seat is attached.
Further, in 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 extends in the vehicle width direction at a boundary between adjacent surface portions. The outer reinforcing member and the inner reinforcing member have a plurality of surface portions that are overlapped with each of the surface portions of the cross member, and the outer reinforcing member and the plurality of surface portions of the inner reinforcing member are It is characterized in that it is overlapped on each of the surface portions of the cross member and spot-welded at each of the overlapped portions.
Further, in the present invention, the outer reinforcing member and the inner reinforcing member are arranged inside the cross section of the cross member, and at the inner end portion of the outer reinforcing member in the vehicle width direction, the inner side facing inward in the vehicle width direction. A contact surface portion is provided, and an outer contact 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.
Further, in the present invention, the outer reinforcing member and the inner reinforcing member are arranged inside the cross section of the cross member, and the outer reinforcing member and the inner reinforcing member have ridge lines on the upper surface portion and the upper surface portion, respectively. It has a front surface portion connected via a ridge 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. The member includes an end portion of the upper surface portion facing the other reinforcing member, an end portion of the front surface portion facing the other reinforcing member, and an end portion of the upper surface portion facing the other reinforcing member. It is characterized in that an inclined surface portion for connecting the surface portions is provided between the rear surface portion and the end portion facing the other reinforcing member.

According to the present invention, even if the fragile portion is deformed at the time of a side collision and a crack occurs in the ridgeline in the fragile portion, the ridgeline portion is reinforced by the outer reinforcing member and the inner reinforcing member, so that the generated crack is generated. It is suppressed from extending outward and inward in the vehicle width direction along the ridgeline.
Therefore, even if the cross member is formed of a material having high tensile strength to reduce the weight, it is advantageous for the cross member to efficiently absorb the energy at the time of a side collision.
Further, according to the present invention, when the fragile portion is deformed at the time of a side collision and a crack occurs in the ridgeline at the fragile portion, the outer reinforcing member and the inner reinforcing member stretch well following the deformation of the cross member. It is more advantageous in suppressing the generated cracks from extending outward and inward in the vehicle width direction along the ridgeline.
Further, according to the present invention, the collision energy applied to the side sill at the time of side collision can be stably transmitted to the fragile portion via the outer reinforcing member, which is advantageous in efficiently absorbing energy at the time of side collision by the fragile portion. ..
Further, according to 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 cost of parts.
Further, according to 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 the cost of parts.
Further, according to the present invention, it is advantageous in reliably reinforcing the plurality of ridge lines of the cross member, and it is possible to prevent the generated cracks from extending outward and inward in the vehicle width direction along the plurality of ridge lines. Will be more advantageous.
Further, according to the present invention, it is more advantageous in suppressing the cracks generated in the fragile portion from extending outward and inward in the vehicle width direction along the 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 in which the outer reinforcing member and the inner reinforcing member are attached to the front cross member. (A) is a sectional view taken along line XX of FIG. 2 (B), and FIG. 2 (B) is a sectional view taken along line YY of FIG. 2 (B). (A) is a perspective view showing a modified example of the outer reinforcing member and the inner reinforcing member, and (B) is a perspective view showing another modified example of the outer reinforcing member and the inner reinforcing member. It is explanatory drawing which shows the deformation of the front cross member by a side collision and the occurrence mechanism of the crack growth along a ridge line, (A) shows the state before deformation, and (B) is the face part of a cross member sandwiching a fragile part. Shows the case where the cross members are deformed so as to pass each other, and (C) shows the case where the face portions of the cross members 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 reference numeral FR indicates the front in the front-rear direction of the vehicle, the reference numeral RH indicates the vehicle width direction, and the reference numeral UPR indicates the upper direction of the vehicle.
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, and an outer reinforcing member 20. It is configured to include the reinforcing member 22.
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 extend to the rear of the vehicle from both sides of the dash panel 24 in the vehicle width direction, and the rear seat cross member 26 is located behind the floor side members 12B.

The floor panel 14 includes a front floor panel 14A and a rear floor panel 14B.
The front floor panel 14A is provided on the pair of floor side members 12B 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 located above the front floor panel 14A.

A floor tunnel 28 is provided at the center of the front floor panel 14A in the vehicle width direction, which is convex upward and extends in the front-rear direction of the vehicle.
A reinforcing member 30 extending in the front-rear direction of the vehicle is attached to the upper part of the floor tunnel 28. Inside the floor tunnel 28, for example, an exhaust pipe, a drive shaft, and the like are housed.

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 of the floor tunnel 28 in the vehicle width direction. The cross member 16 is a front cross member 32 and a center cross located behind the front cross member 32. It is configured to include the member 34.
The front cross member 32 is a place where the front mounting brackets (not shown) of the seat slide rails on both sides of the driver's seat and the passenger's seat in the vehicle width direction are attached, and the center cross member 34 is a vehicle of the driver's seat and the passenger's seat. This is the place where the rear mounting brackets (not shown) of the seat slide rails on both sides in the width direction are attached.
The inner ends of the front cross member 32 and the center cross member 34 in the vehicle width direction are attached to the floor tunnel 28, and the parts near the outer ends in the vehicle width direction are attached to the front side member 12A via the front floor panel 14A. It is worn, and the outer end in the vehicle width direction is attached to the side sill 18.
The side sill 18 is attached to the outer end of the front floor panel 14A in the vehicle width direction and the outer end of the cross member 16 in the vehicle width direction and extends in the front-rear direction of the vehicle.
The front end of the side sill 18 is attached to the lower end of the dash panel 24, and the rear end of the side sill 18 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 from each other, and has an open cross section downward.
That is, the front cross member 32 is connected to the front end 3202 facing the front of the vehicle, the upper surface 3204 connected to the upper end of the front 3202 and facing upward, and the rear end of the upper surface 3204 to face the rear of the vehicle. The rear surface portion 3206, the flange 3207 provided at the lower ends of the front surface portion 3202 and the rear surface portion 3206 and attached to the front floor panel 14A, and the side sill 18 provided at the outer ends of the front surface portion 3202 and the rear surface portion 3206 in the vehicle width direction. It has a flange 3208 to be attached and a flange 3209 provided on the outer end of the upper surface portion 3204 in the vehicle width direction and attached to the side sill 18.
The boundary between the front surface portion 3202 and the upper surface portion 3204 is the first ridge line 3210, and the boundary portion between the upper surface portion 3204 and the rear surface portion 3206 is the second ridge line 3212. 3210, the second ridge line 3212 extends in the vehicle width direction along the front cross member 32.

A fragile portion 36 is provided at a position near the end of the front cross member 32 on the outer side of the vehicle width.
The fragile portion 36 efficiently absorbs the collision energy at the time of a side collision, appropriately protects the functional parts for the vehicle arranged inside the vehicle, and appropriately protects the occupants.
The fragile portion 36 is configured to induce deformation as compared with other portions of the front cross member 32.
The fragile portion 36 includes an inner displacement portion 3602 provided on the front portion 3202 and the rear surface portion 3206 and displaced inward of the front cross member 32, and an upper displacement portion 3604 provided on the upper surface portion 3204 and displaced upward of the front cross member 32. It is configured to include and.

As shown in FIGS. 2A and 2B, the outer reinforcing member 20 and the inner reinforcing member 22 are located at the outer front cross member 32 in the vehicle width direction and inside in the vehicle width direction, sandwiching the fragile portion 36 in the vehicle width direction. The front cross member 32 of the above is provided so as to reinforce the ridgeline portion of those portions.
The outer reinforcing member 20 and the inner reinforcing member 22 are made of a material having a larger elongation than the front cross member 32.
The outer end of the outer reinforcing member 20 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 fragile portion 38 for the reinforcing member.

The outer reinforcing member 20 and the inner reinforcing member 22 are arranged inside the cross section of the cross member 16, and have a plurality of surface portions that are overlapped and attached to each surface portion 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, similarly to 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 they are arranged inside in this way, there is no problem of narrowing the space on the floor panel 14, and the floor panel 14 is topped. It is advantageous in laying out various members and parts provided in the above.
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 spot welded at each of the overlapped portions.
That is, as shown in FIGS. 2 (A), 2 (B), 3 (A), and (B), the front surface portion 2002, the upper surface portion 2004, and the rear surface portion 2006 of the outer reinforcing member 20 have the vehicle width of the fragile portion 36. At the location of the front cross member 32 on the outer side in the direction, the front cross member 32 is overlapped with the inside of the front portion 3202, the upper surface portion 3204, and the rear surface portion 3206, and each is spot welded.
Further, the front surface portion 2202, the upper surface portion 2204, and the rear surface portion 2206 of the inner reinforcing member 22 are located on the front cross member 32 inside the fragile portion 36 in the vehicle width direction. It is overlapped on the inside of the rear surface portion 3206 and spot welded to each.
Further, the fragile portion 38 for the reinforcing member is not spot welded to the fragile portion 36 and the upper surface portion 3204 of the corresponding front cross member 32.
In addition, in FIG. 2 (B) and FIG. 3 (B), the symbol * indicates a spot-welded portion.
At the front cross member 32 where the outer reinforcing member 20 is provided, the front mounting brackets of the seat slide rails on the outer side in the vehicle width direction among the front mounting brackets of the seat slide rails on both sides of the driver's seat and the passenger seat in the vehicle width direction are The outer reinforcing member 20 is provided to reinforce the first ridge line 3210 and the second ridge line 3212, and the front cross member 32 to which the front side mounting brackets of the seat slide rails on the outer side in the vehicle width direction of the driver's seat and the passenger's seat are attached. The part of is also reinforced.

As shown in FIGS. 2A and 2B, the fragile portion 38 for the reinforcing member has only the upper surface portion 2004 which is smaller than the upper surface portion 2004 of the outer reinforcing member 20 and the upper surface portion 2204 of the inner reinforcing member 22. However, it is formed in a convex shape upward corresponding to the upper displacement portion 3604, and is configured to induce deformation as compared with the outer reinforcing member 20 and the inner reinforcing member 22.
The fragile portion 38 for the reinforcing member is arranged at a position corresponding to the fragile portion 36 of the cross member 16 so as not to hinder the deformation of the fragile portion 36 at the time of a side collision.

Next, the action 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 provided with 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 ridge line 3210 and the second ridge line 3210 and the second ridge line 3210 and the second in the fragile portion 36 are deformed. It is feared that a crack will be generated in the ridge line 3212, and the crack will propagate 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 crack growth are assumed.

(1) As shown in FIG. 5 (B), of the upper surface portions 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 surface portion 3204 in the vehicle width direction is inside. The upper surface portion 3204 of the above is deformed upward.
Further, among the front portion 3202 and the rear surface portion 3206 of the front cross member 32 sandwiching the fragile portion 36, for example, the front 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.
By deforming 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 so as to pass each other, the fragile portion 36 has the first ridge line 3210 and the second ridge line 3212. A crack is generated in the vehicle, and the generated crack extends 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 portions 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 surface in the vehicle width direction It deforms upward of the front cross member 32.
Further, of the front portion 3202 and the rear surface portion 3206 of the front cross member 32 sandwiching the fragile portion 36, both the front portion 3202 on the outer side in the vehicle width direction and the front portion 3202 on the inner side in the vehicle width direction are inside the front cross member 32. At the same time, both 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.
In this way, 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 are deformed in the fragile portion 36. A crack is generated in the vehicle, and the generated crack extends 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 cracks generated from the fragile portion 36 at the time of a side collision propagate 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 deteriorates. It ends up.
In particular, when the cross member 16 is formed of a material having high tensile strength in order to reduce the weight (thinness), there is a disadvantage that the elongation of the material is small and the growth of cracks along the ridge line becomes remarkable.

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 An outer reinforcing member 20 and an inner reinforcing member 22 for reinforcing the portions of the first ridge line 3210 and the second ridge line 3212 are provided, respectively.
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 and the second ridge line 3210 are formed by the outer reinforcing member 20 and the inner reinforcing member 22. Since the portion of the two ridge lines 3212 is reinforced, it is possible to prevent the generated cracks from extending outward and inward in the vehicle width direction along the first ridge line 3210 and the second ridge line 3212.
Therefore, even if the front cross member 32 is formed of a material having high tensile strength to reduce the weight, it is advantageous for the front cross member 32 to efficiently absorb the energy at the time of a side collision.

Further, in the present embodiment, the outer reinforcing member 20 and the inner reinforcing member 22 are made of a material having a larger elongation than the front cross member 32.
Therefore, as compared with the case where the outer reinforcing member 20 and the inner reinforcing member 22 are made of the same or smaller elongation material as 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 in the fragile portion 36. When cracks occur in the 3210 and the second ridge line 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 cracks occur in the first ridge line 3210 and the second ridge line 3210 and the second ridge line 3212. It is more advantageous in suppressing the extension to the outside and the inside in the vehicle width direction along the ridge line 3212.

Further, in the present embodiment, since the outer end portion of the outer reinforcing member 20 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 is applied to the fragile portion 36 via the outer reinforcing member 20. It can be stably transmitted to the vehicle, which is advantageous in efficiently absorbing energy at the time of a side collision by the fragile portion 36.

Further, in the present embodiment, since the outer reinforcing member 20 and the inner reinforcing member 22 are connected and integrated via the fragile portion 38 for the reinforcing member, the outer reinforcing member 20 and the inner reinforcing member 22 are separated. This is advantageous in terms of simplifying the attachment of the outer reinforcing member 20 and the inner reinforcing member 22 to the front cross member 32 and reducing the cost of parts as compared with the case of the above configuration.

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

Further, in the present embodiment, the front surface 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 on the front surface portion 3202, the upper surface portion 3204, and the rear surface portion 3206 of the front cross member 32, respectively. It is spot-welded at each of the overlapped points.
Therefore, it is advantageous to reliably reinforce the first ridge line 3210 and the second ridge line 3212 of the front cross member 32, and the generated cracks are outside and inside in the vehicle width direction along the first ridge line 3210 and the second ridge line 3212. It becomes more advantageous in suppressing the progress to.

Next, a modified example will be described with reference to FIGS. 4 (A) and 4 (B).
In the modified example shown in FIG. 4A, one reinforcing member of the outer reinforcing member 20 and the inner reinforcing member 22 faces the other reinforcing member of the upper surface portion and the other reinforcing member of the front surface portion. An inclined surface portion for connecting these surface portions is provided between the end portion and 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.
That is, in this modification, between the outer end portion of the upper surface portion 2204 of the inner reinforcing member 22 in the vehicle width direction and the outer end portion of the front surface portion 2202 in the vehicle width direction, and outside the vehicle width direction of the upper surface portion 2204. An inclined surface portion 2208 that faces diagonally outward in the vehicle width direction is provided between the end portion and the end portion on the outer side in the vehicle width direction of the rear surface portion 2206.
The inclined surface portion 2208 is a vehicle of the inclined surface portion 2208 and the outer reinforcing member 20 when the upper surface portions 3204 of the front cross member 32 sandwiching the fragile portion 36, the front surface portions 3202, and the rear surface portions 3206 are deformed so as to pass each other. The inner edges in the width direction come into contact with each other, suppressing the passing of the upper surface portions 3204, the front surface portions 3202, and the rear surface portions 3206, and the cracks generated along the first ridge line 3210 and the second ridge line 3212. It is advantageous in suppressing the extension to the outside and the inside in the direction.
It should be noted that such an inclined surface portion may be provided on at least one of the inner reinforcing member 22 and the outer reinforcing member 20.
Further, in this modification, the fragile portion 38 for the reinforcing member may be omitted, and the outer reinforcing member 20 and the inner reinforcing member 22 may be separated from each other.

In the modified example shown in FIG. 4B, an inner contact surface portion 2010 facing inward in the vehicle width direction is provided at the inner end portion of the outer reinforcing member 20 in the vehicle width direction, and the inner reinforcing member 22 is provided on the outer side in the vehicle width direction. An outer contact surface portion 2210 facing outward in the vehicle width direction is provided at the end portion of the vehicle.
The inner contact surface portion 2010 and the outer contact surface portion 2210 come into contact with 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 fragile portion 36 are deformed so as to pass each other. In contact with each other, the upper surface portions 3204, the front surface portions 3202, and the rear surface portions 3206 are suppressed from passing each other, and the generated cracks propagate outward and inward in the vehicle width direction along the first ridge line 3210 and the second ridge line 3212. It is advantageous in suppressing.
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 and 2202 and the rear surface portions 2006 and 2206, respectively, has been described. The contact surface portion 2210 may be provided on the upper surface portions 2004 and 2204.
Further, in this modification, the fragile portion 38 for the reinforcing member may be omitted, and the outer reinforcing member 20 and the inner reinforcing member 22 may be separated from each other.

In the present embodiment, the front cross member 32 has three face portions such as a front portion 3202, an upper surface portion 3204, and a rear surface portion 3206, a first ridge line 3210 at the boundary between the front portion 3202 and the upper surface portion 3204, and an upper surface portion 3204. Although the case of having the second ridge line 3212 at the boundary between the front surface portion 3206 and the rear surface portion 3206 has been described, the front cross member 32 may have a plurality of surface portions, and the ridge line extends to the boundary portion of the adjacent surface portions. The present invention can be applied to front cross members 32 having various shapes known in the past.
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 also applies when the front cross member 32 is provided on the lower surface of the floor panel 14. Applies.
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 reinforces both the first ridge line 3210 and the second ridge line 3212. The case of reinforcing the above was explained.
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. , The inner reinforcing member 22 that reinforces the second ridge line 3212 may be separated from each other.
Further, in the present embodiment, the case where the present invention is applied to the front cross member 32 has been described, but it goes without saying that the present invention may be applied to the center cross member 34, and can be widely applied to the cross member. Is.

10 Body floor structure 12 Side member 12A Front side member 14 Floor panel 14A Front floor panel 16 Cross member 18 Side sill 20 External reinforcement member 2002 Front part 2004 Top surface part 2006 Rear surface part 22 Internal reinforcement member 2202 Front part 2204 Top surface part 2206 Rear surface part 2208 Inclined surface 32 Front cross member 3202 Front 3204 Top 3206 Rear 3210 1st ridge 3212 2nd ridge 36 Vulnerable part

Claims (8)

Equipped with 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 position near the end outside the vehicle width.
The cross member on the outer side in the vehicle width direction and the cross member on the inner side in the vehicle width direction sandwiching the fragile portion in the vehicle width direction are arranged adjacent to the fragile portion, and the ridgeline of those portions. An outer reinforcing member and an inner reinforcing member for reinforcing the portion are provided, respectively.
The body floor structure is characterized by this. The outer reinforcing member and the inner reinforcing member are made of a material having a larger elongation than the cross member.
The vehicle body floor structure according to claim 1. The outer end of the outer reinforcing member in the vehicle width direction is connected to the side sill.
The vehicle body floor structure according to claim 1 or 2. The outer reinforcing member and the inner reinforcing member are connected and integrated via a fragile portion for the reinforcing member.
The vehicle body floor structure according to any one of claims 1 to 3, wherein the vehicle body floor structure is characterized in that. The outer reinforcing member reinforces the portion of the front cross member to which the bracket for attaching 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 characterized in that. The cross member has a plurality of face portions extending in the vehicle width direction while facing different directions.
The ridgeline extends in the vehicle width direction at the boundary between adjacent surfaces.
The outer reinforcing member and the inner reinforcing member have a plurality of surface portions that are overlapped with each of the surface portions of the cross member.
The outer reinforcing member and the plurality of surface portions of the inner reinforcing member are respectively overlapped with each of the surface portions of the cross member, and are spot-welded at the overlapped portions.
The vehicle body floor structure according to any one of claims 1 to 5, wherein the vehicle body floor structure is characterized in that. The outer reinforcing member and the inner reinforcing member are arranged inside the cross section of the cross member.
An inner contact surface portion facing inward in the vehicle width direction is provided at the inner end portion of the outer reinforcing member in the vehicle width direction.
An outer contact 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.
The vehicle body floor structure according to any one of claims 1 to 5, wherein the vehicle body floor structure is characterized in that. The outer reinforcing member and the inner reinforcing member are arranged inside the cross section of the cross member.
The outer reinforcing member and the inner reinforcing member are connected to the upper surface portion, the front surface portion connected to the upper surface portion via a ridge line, and the front portion facing the front of the vehicle, and the upper surface portion connected to the rear surface portion via the ridge line, respectively. Has a facing rear part and
One reinforcing member 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 said. An inclined surface portion for connecting these surface portions is provided 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.
The vehicle body floor structure according to any one of claims 1 to 5, wherein the vehicle body floor structure is characterized in that.

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