JP5739787B2 - Body floor structure - Google Patents

Description

  The present invention relates to a vehicle body floor structure.

Conventionally, the following techniques are known for the vehicle body floor structure.
Between the upper flat plate and the lower flat plate constituting the floor body, a plurality of horizontal core members extending in the vehicle width direction (left-right direction) and arranged in the front-rear direction, and a plurality of horizontal core members extending in the front-rear direction and arranged in the vehicle width direction A technology including a vertical core material is known (see Patent Document 1).

  Further, a technique is known in which a floor frame (reinforcing member, strength member) extending in the front-rear direction is attached to the bottom surface (lower surface) of the floor panel to reinforce the floor panel (see Patent Document 2).

Japanese Patent No. 4021672 JP 2010-241261 A

  However, in Patent Document 1, since the vertical member extends in the front-rear direction and the horizontal member extends in the vehicle width direction, when the vehicle collides with a narrow offset, the front wheel moves backward and the collision load is input to the floor panel obliquely rearward. However, the vehicle body such as the floor panel may be greatly deformed. A narrow offset collision refers to a frontal collision in which the collision position of an oncoming vehicle or the like is offset outward in the vehicle width direction from the front side frame.

  Also, in Patent Document 2, as in Patent Document 1, since the floor frame as a reinforcing member extends in the front-rear direction, when a narrow offset collision occurs, the collision load is input to the floor panel obliquely rearward, There is a risk that the vehicle body will be greatly deformed.

  Accordingly, an object of the present invention is to provide a vehicle body floor structure in which the vehicle body is not easily deformed even in a narrow offset collision.

  As means for solving the above-mentioned problems, the present invention includes a side sill inner, a side sill extending in the front-rear direction, and an extension on the rear side of the front side frame. An extension portion that is bent while being bent and is coupled to the side wall of the front end portion of the side sill inner, and a tunnel frame that extends from the inner side wall of the extension portion to the rear inner side, and then extends rearward at the center in the vehicle width direction. A floor panel coupled to the side sill inner and the tunnel frame; an under panel disposed below the floor panel; a floor cross member extending in the vehicle width direction and coupled to the side sill inner and the tunnel frame; The extension, the side sill inner, the floor cross member, and the tunnel frame And is coupled to the floor panel and the under panel while being sandwiched between the floor panel and the under panel, and includes an X-shaped core material in plan view, the core material comprising: a first core material; A second core material, and the first core material is oblique to the front-rear direction and the vehicle width direction, and extends toward the center in the vehicle width direction toward the rear side, and the second core material is The vehicle body floor structure is characterized in that it is inclined with respect to the front-rear direction and the vehicle width direction and extends so as to approach the outside in the vehicle width direction toward the rear side.

  According to such a configuration, the rearward collision load that acts when the vehicle normally collides from the front (normal collision), the side sill inner (side sill) and the tunnel frame from the front side frame via the extension portion. And distributed. Thus, since the collision load at the time of a normal collision is distributed to the side sill inner (side sill) and the tunnel frame, the floor panel (vehicle body) is difficult to deform.

  On the other hand, when the vehicle collides with a narrow offset, (1) it is oblique to the front-rear direction and the vehicle width direction with respect to the oblique rearward collision load, and extends to approach the center in the vehicle width direction toward the rear side. The first core member generates a reaction force of compression, and (2) the second core member that is inclined with respect to the front-rear direction and the vehicle width direction and extends so as to approach the vehicle width direction outer side toward the rear side is bent. The floor panel (vehicle body) is not easily deformed.

  Moreover, since it is the structure which mainly adds a 1st core material and a 2nd core material, a deformation | transformation of a floor panel (vehicle body) can be suppressed, reducing a vehicle body floor structure.

  Further, in the vehicle body floor structure, the first core member is coupled to the floor panel and the under panel in the longitudinal direction, and the second core member is coupled to the floor panel and the under panel in the longitudinal direction. It is preferable that it is couple | bonded with each.

  According to such a structure, a double floor structure is comprised by the 1st core material and the 2nd core material, and the floor panel and under panel which these couple | bond together in a longitudinal direction. And since this double floor structure has a some closed cross section, the cross-sectional secondary moment becomes large and rigidity increases. Thereby, the vibration of the vehicle can be reduced while further suppressing deformation of the floor panel and the like.

  In the vehicle body floor structure, the tunnel space formed by the tunnel frame includes a tunnel cross member extending in the vehicle width direction at the same position as the floor cross member in the front-rear direction, and the front end of the first core member is The extension portion is coupled to the side sill inner side, the rear end of the first core member is disposed at the joint portion of the tunnel cross member and the floor cross member, and the front end of the second core member is the tunnel. It is preferable that the frame bends from a portion extending in an inclined manner to a portion extending backward, and a rear end of the second core member is disposed at a joint portion between the side sill inner and the floor cross member. .

Here, the side sill inner side of the extension, the coupling portion between the tunnel cross member and the floor cross member, the bending portion that bends from the inclined extending portion to the rear extending portion of the tunnel frame, and the coupling between the side sill inner and the floor cross member The part has high rigidity.
And according to such a structure, since the 1st core material and the 2nd core material couple | bond with the part with high rigidity, and are supported from the both sides, the reaction force of the above-mentioned compression and the reaction force of bending are It tends to occur.

  In the vehicle body floor structure, it is preferable that the under panel is coupled to a bottom surface of the extension portion, a bottom surface of the side sill inner, and a bottom surface of the tunnel frame.

  According to such a configuration, the lower surface of the vehicle body floor structure is flattened by the under panel, and the air resistance received during traveling is reduced. This improves the aerodynamic performance of the vehicle.

  In the vehicle body floor structure, it is preferable that the side sill inner and / or the tunnel frame to which the first core material and / or the second core material are coupled include a bulkhead that reinforces the coupling portion.

  According to such a configuration, the connecting portion of the first core material and / or the second core material is reinforced by the bulkhead, so that the reaction force is quickly generated in the first core material and / or the second core material. It tends to occur.

  According to the present invention, it is possible to provide a vehicle body floor structure in which a vehicle body is hardly deformed even in a narrow offset collision.

It is the figure which looked at the body floor structure concerning this embodiment from the lower part. It is the figure which looked at the body floor structure concerning this embodiment from the lower part, and is the state where the under panel was removed. It is the X1-X1 sectional view taken on the line of FIG. It is the X2-X2 sectional view taken on the line of FIG. It is the X3-X3 sectional view taken on the line of FIG. It is the X4-X4 sectional view taken on the line of FIG. It is a partial perspective view of the vehicle body floor structure according to the present embodiment. (A) is a disassembled perspective view of a 1st core material and a 2nd core material, (b) is a perspective view of a 1st core material and a 2nd core material, (c) is X5-X5 of (b). It is line sectional drawing. It is a perspective view which shows one attachment procedure of a 1st core material and a 2nd core material. It is the figure which looked at the vehicle body floor structure concerning this embodiment from the lower part, Comprising: It is a figure explaining the effect at the time of a normal collision. It is the figure which looked at the body floor structure concerning this embodiment from the lower part, Comprising: It is a figure explaining the effect at the time of a narrow offset collision. (A) is a perspective view of the 1st core material and 2nd core material which concern on a modification, (b) is a disassembled perspective view, (c) is the disassembled perspective view seen from the downward direction. (A) is a perspective view of the 1st core material and 2nd core material which concern on a modification, (b) is a disassembled perspective view.

  An embodiment of the present invention will be described with reference to FIGS.

≪Configuration of body floor structure≫
The vehicle body floor structure 1 according to the present embodiment includes two side sills 10, two front side frames 20, a substantially Y-shaped tunnel frame 40, a tunnel cross member 51, and two floor cross members 55. And two floor panels 60 (upper panel) for front side, two under panels 70 (lower panel), four first core members 80, and four second core members 90. ing. However, the number of the first core members 80 and the second core members 90 is not limited to this.
The vehicle body floor structure 1 is a symmetric structure in the vehicle width direction (left-right direction) as shown in FIGS. Hereinafter, the left half of the vehicle body floor structure 1 will be mainly described.

<Side sill>
The side sill 10 is a rectangular tubular part that is disposed on both sides of the vehicle body and extends in the front-rear direction (see FIG. 3). The side sill 10 includes a lateral U-shaped side sill inner 11 that opens in the vehicle width direction outside, and a lateral U-shaped side sill outer 12 that opens in the vehicle width direction inside. The side sill 10 is configured by joining flange portions formed on both sides of the opening portion of the side sill inner 11 and flange portions formed on both sides of the opening portion of the side sill outer 12.

In the side sill 10, a bulkhead 15 (reinforcing member, partition wall) is provided on a substantially extended line on the front side of the first core member 80 (see FIG. 7). By this bulk head 15 and a bulk head 45 described later, a reaction force of an axial compression force described later on the first core member 80 is generated early at the time of a narrow offset collision.
The bulkhead 15 may have a size corresponding to the side sill inner 11, for example. The same applies to the bulkhead 16 described later.

  In the side sill 10, the bulkhead 16 is provided on the substantially extended line on the rear side of the second core member 90 (see FIG. 7). By this bulk head 16 and a bulk head 46 described later, a reaction force of a bending stress described later is generated early on the second core member 90 at the time of a narrow offset collision.

<Front side frame>
The front side frame 20 extends from the left or right side of the engine room 201 to the front side frame main body 21 extending in the front-rear direction and the rear end of the front side frame main body 21 and extends while bending outward in the vehicle width direction. 11 and an extension portion 22 coupled to the front end portion (see FIG. 4).

  The extension portion 22 extends along a horizontal portion 211 that extends in the horizontal direction of the dashboard lower panel 210 (see FIGS. 4 to 6). Further, the upper side of the extension portion 22 is open, the extension portion 22 bends outward in the vehicle width direction while expanding the opening width to the rear outer side (see FIG. 2), and the vehicle width direction of the front end portion of the side sill inner 11 It couple | bonds with the inner side wall and the bottom wall of the front-end part of the side sill inner 11 (refer FIG. 4). Further, the rear side of the extension portion 22 rises upward to form a rear wall portion 23 (see FIGS. 5 and 6), and the rear wall portion 23 is coupled to the front end of the floor panel 60.

  In addition, the open part of the extension part 22 is covered with the horizontal part 211, and the box structure is comprised (refer FIGS. 4-6).

  Here, the dashboard lower panel 210 includes, in addition to the horizontal portion 211, a vertical portion 212 that extends upward in the vertical direction from the front end of the horizontal portion 211 (see FIGS. 4 to 6). Further, the front ends of the left and right front side frame bodies 21 are connected by a front cross member 29 (bumper beam) extending in the vehicle width direction (see FIGS. 1 and 2).

<Tunnel frame>
The tunnel frame 40 is a frame that forms a tunnel space 49 extending in the front-rear direction at the center in the vehicle width direction (see FIG. 3). The tunnel frame 40 is substantially Y-shaped with a front side bifurcated (see FIG. 2), two inclined portions 41, and a tunnel frame main body 42 that extends in the front-rear direction and forms a tunnel space 49 therein. It is equipped with.

  The front end of the inclined portion 41 is coupled to the inner wall of the extension portion 22 of the front side frame 20. The two left and right inclined portions 41 extend from the connecting portion with the extension portion 22 so as to incline toward the rear inner side, and are joined to the tunnel frame main body 42. That is, the tunnel frame 40 extends from the inner side wall of the extension portion 22 in a rearward inward direction, and then extends rearward at the center in the vehicle width direction.

  In the tunnel frame 40, a bulkhead 45 (reinforcing member, partition wall) is provided on a substantially extended line on the rear side of the first core member 80 (see FIG. 7). In the tunnel frame 40, a bulkhead 46 is provided on a substantially extended line on the front side of the second core member 90 (see FIG. 7).

<Tunnel cross member>
The tunnel cross member 51 extends in the vehicle width direction in the tunnel space 49 (in the tunnel frame main body 42), and both ends thereof are respectively coupled to the inner wall surface of the tunnel frame main body 42 (FIGS. 1, 2, and 2). (See FIGS. 3, 5, and 7).
Moreover, it is good also as a structure provided with the bulkhead extended in the vehicle width direction in the tunnel frame main body 42 above the tunnel cross member 51. FIG.

<Floor cross member>
The floor cross member 55 extends in the vehicle width direction above the floor panel 60. The outer end in the vehicle width direction of the floor cross member 55 is coupled to the side sill inner 11, and the inner end in the vehicle width direction of the floor cross member 55 is coupled to the tunnel frame main body 42 (FIGS. 1, 2, 3, and 4). (See FIG. 5).

  Further, the tunnel cross member 51 and the two floor cross members 55 are disposed at the same position in the front-rear direction (see FIGS. 1 and 2). That is, the tunnel cross member 51 and the two floor cross members 55 are arranged in a straight line in the vehicle width direction.

<Floor panel>
The floor panel 60 is a thin plate-like panel that constitutes the upper surface of the vehicle body floor structure 1. The peripheral edge of the floor panel 60 is coupled to the side sill inner 11, the tunnel frame body 42, the horizontal portion 211 of the dashboard lower panel 210, and the rear wall portion 23 formed on the rear side of the extension portion 22 (FIG. 3, FIG. (See FIGS. 5 and 6).

<Under panel>
The under panel 70 is a thin plate-like panel that constitutes the lower surface of the vehicle body floor structure 1. The peripheral edge of the under panel 70 is coupled to the bottom surface of the extension 22, the bottom surface of the side sill inner 11, the bottom surface of the inclined portion 41 of the tunnel frame 40, and the bottom surface of the tunnel frame main body 42 (see FIGS. 1 and 3).
Thereby, the lower surface of the vehicle body floor structure 1 is flattened by the under panel 70, and the air resistance received during traveling is reduced. This improves the aerodynamic performance of the vehicle.

<First core material, second core material>
As shown in FIG. 2, the first core member 80 is inclined with respect to the front-rear direction and the vehicle width direction, and extends so as to approach the center in the vehicle width direction toward the rear side. Therefore, the first core member 80 extends along the direction of the collision load F6 input from the front wheel 221 (see FIG. 11) to the floor panel 60 at the time of the narrow offset collision.

  The second core member 90 is inclined with respect to the front-rear direction and the vehicle width direction, and extends so as to approach the outer side in the vehicle width direction toward the rear side. Therefore, the second core member 90 extends in a direction intersecting with the direction of the collision load F6 at the time of the narrow offset collision (see FIG. 11).

  Moreover, the whole core material provided with the 1st core material 80 and the 2nd core material 90 becomes X shape by planar view (refer FIG. 2). And the whole core material is surrounded by extension part 22, side sill inner 11, floor cross member 55, and tunnel frame 40 (inclination part 41, tunnel frame main part 42) by plane view. Moreover, the whole core material is couple | bonded with the floor panel 60 and the under panel 70 in the state pinched | interposed by the floor panel 60 and the under panel 70 in the up-down direction (refer FIG. 11).

  The front end of the first core member 80 is coupled to the side sill inner 11 side of the extension 22 of the front side frame 20, as shown in FIG. In addition, the side sill inner 11 side of the extension part 22 is a highly rigid part.

  The rear end of the first core member 80 is disposed at a joint where the tunnel cross member 51 and the floor cross member 55 are joined. That is, the rear end of the first core member 80 is coupled to the tunnel frame main body 42 at a position where the tunnel cross member 51 and the floor cross member 55 substantially overlap with a portion where the tunnel cross main member 42 is coupled to the tunnel frame main body 42 in plan view. The portion where the tunnel cross member 51 and the floor cross member 55 are coupled to the tunnel frame main body 42 is a highly rigid portion.

  As described above, both ends of the first core member 80 are coupled to a portion having high rigidity. Thereby, the first core member 80 is likely to generate a reaction force of a shaft compression force described later at the time of a narrow offset collision.

  The front end of the second core member 90 is coupled to a bent portion that bends from a portion extending in an inclined manner of the tunnel frame 40 to a portion extending rearward. That is, the front end of the second core member 90 is coupled to a bent portion that bends from the inclined portion 41 extending in the oblique direction to the tunnel frame main body 42 extending in the front-rear direction. The bent portion is a highly rigid portion.

  The rear end of the second core member 90 is disposed at the joint between the side sill inner 11 and the floor cross member 55. That is, the rear end of the second core member 90 is coupled to the side sill inner 11 at a position that substantially overlaps the portion where the side sill inner 11 and the floor cross member 55 are coupled in plan view. The portion where the side sill inner 11 and the floor cross member 55 are coupled is a highly rigid portion.

  As described above, both ends of the second core member 90 are coupled to a portion having high rigidity. Thereby, the second core member 90 is likely to generate a reaction force of bending stress described later at the time of a narrow offset collision.

<First core material-specific shape>
As shown in FIG. 8, the first core member 80 is an elongated part that has a substantially S-shape (crank shape) in cross-sectional view, and includes a vertical wall portion 81 extending in an oblique direction and an upper end of the vertical wall portion 81. The upper flange part 82 extended in a horizontal direction and the lower flange part 83 extended in the horizontal direction from the lower end of the vertical wall part 81 are provided.
However, the shape of the first core member 80 is not limited to this, and may be, for example, a pipe shape (cylindrical shape), a columnar shape, a rectangular tube shape, or a prismatic shape.

  The direction of the lower flange portion 83 is a direction approaching the side sill inner 11 (outward in the vehicle width direction), and at the front end of the first core member 80, the lower flange portion 83 includes the bottom wall of the side sill inner 11 and the extension portion 22. (See FIG. 4).

  The upper flange portion 82 is coupled to the floor panel 60 in the longitudinal direction of the first core member 80. Specifically, for example, (1) the upper flange portion 82 and the floor panel 60 are coupled by any one of continuous welding, (2) spot welding, (3) bolt fastening, and (4) rivet fastening.

  The lower flange portion 83 is coupled to the under panel 70 in the longitudinal direction of the first core member 80. Specifically, for example, similarly to the upper flange portion 82, the lower flange portion 83 and the under panel 70 are joined by continuous welding or the like.

<Second core material-specific shape>
As shown in FIG. 8, the second core member 90 is an elongated part having a substantially S-shape (crank shape) in a cross-sectional view, and includes a vertical wall portion 91 extending in an oblique direction and an upper end of the vertical wall portion 91. An upper flange portion 92 extending in the horizontal direction and a lower flange portion 93 extending in the horizontal direction from the lower end of the vertical wall portion 91 are provided.

  The upper flange portion 92 is coupled to the floor panel 60 in the longitudinal direction of the second core member 90. Specifically, for example, (1) the upper flange portion 92 and the floor panel 60 are coupled by any one of continuous welding, (2) spot welding, (3) bolt fastening, and (4) rivet fastening.

  The lower flange portion 93 is coupled to the under panel 70 in the longitudinal direction of the second core member 90. Specifically, for example, similarly to the upper flange portion 92, the lower flange portion 93 and the under panel 70 are coupled by continuous welding or the like.

<Assembled state of first core material and second core material>
As shown in FIG. 8A, the first core member 80 is formed with two notches 85 opened upward, and the second core member 90 is formed with two notches 95 opened downward. And if the 1st core material 80 and the 2nd core material 90 are assembled | attached in the up-down direction, aligning the notch 85 and the notch 95, the 1st core material 80 and the 2nd core material 90 will mutually be assembled | attached, and X The entire letter-shaped core is constructed. The upper surface and the lower surface of the entire core material are configured to be flat (see FIGS. 8B and 8C). The floor panel 60 is connected to the upper surface side and the under panel 70 is connected to the lower surface side by welding or the like.

  The first core member 80 and the second core member 90 are joined to each other by MIG welding or the like at the intersection of the first core member 80 and the second core member 90. In addition, for example, the second core member 90 may be divided into two without forming the notch 85 and the notch 95, and the divided piece may be coupled to the first core member 80.

  Then, as shown in FIG. 9, after the assembly of the first core member 80 and the second core member 90 is joined to the under panel 70 by welding or the like, (2) the floor panel 60 is moved downward. And connecting the under panel 70 to the extension portion 22, the side sill inner 11 and the tunnel frame 40 (inclined portion 41, tunnel frame main body 42) by welding or the like, and the first core member 80 and the second core member 90. The floor panel 60 is joined by welding or the like.

≪Function and effect of body floor structure≫
Next, functions and effects of the vehicle body floor structure 1 will be described.

<During normal collision>
With reference to FIG. 10, a description will be given of a normal collision when the vehicle normally collides with an oncoming vehicle, an obstacle such as a road surface obstacle from the front.
When a normal collision occurs, a rearward collision load F0 acts on the front side frame main body 21, and this collision load F0 includes a collision load F1 directed from the front side frame main body 21 to the side sill inner 11 via the extension portion 22, and an inclined portion. It is distributed to a collision load F2 directed to the tunnel frame main body 42 via 41. Thus, since the collision load F0 is distributed to the side sill inner 11 (side sill 10) and the tunnel frame main body 42 (tunnel frame 40), the vehicle bodies such as the floor panel 60 and the under panel 70 are not easily deformed.

<Narrow offset collision>
With reference to FIG. 11, the case of a narrow offset collision will be described.
When a narrow offset collision occurs, a rearward collision load F5 acts on the front wheel 221. The front wheel 221 moves backward about the steering shaft portion (not shown) extending in a substantially vertical direction, and strikes the extension portion 22 obliquely rearward. A load F6 is input. In FIG. 11, a right rearward collision load F6 is shown.

  With respect to such a right-backward collision load F6, (1) the two first core members 80 in the direction of the collision load F6 generate reaction forces of the axial compression force, and (2) the direction of the collision load F6. Since the two second core members 90 in the intersecting direction generate a reaction force of bending stress, deformation of the horizontal portion 211 (floor surface) of the dashboard lower panel 210, the floor panel 60, the under panel 70, and the like is suppressed. In addition, since there are a plurality of first core members 80, even if the front wheel 221 collides with the extension portion 22 by being displaced, the plurality of first core members 80 can receive the collision load F6 and can be deformed. Can be suppressed. In addition, the number of the 1st core material 80 and the 2nd core material 90 is not limited to this, You may change suitably to three, four ....

In addition, since the first core member 80 and the second core member 90 and the floor panel 60 and the under panel 70 coupled to the first core member 80 and the second core member 90 form a double floor structure, a plurality of closed cross sections of the double floor structure are used. The moment of inertia of the cross section is improved and the rigidity is increased, and the deformation of the horizontal portion 211 (floor surface) of the dashboard lower panel 210 and the deformation of the floor panel 60 continuing to the rear thereof are further suppressed.
Furthermore, since the rigidity of the vehicle body floor structure 1 is improved in this way, floor vibration accompanying traveling is reduced, and noise resistance and vibration resistance performance are also improved.

≪Modification≫
As mentioned above, although embodiment of this invention was described, this invention is not limited to this, For example, it can change as follows.

About the 1st core material and the 2nd core material, it is good also as composition shown in Drawing 12 (a)-Drawing 12 (c).
The first core member 180 and the second core member 190 have a substantially hat shape in cross-sectional view. The upper surface portion of the first core member 180 is coupled to the floor panel 60 by welding, bolt fastening, or the like. Flange portions that extend outward at both lower portions of the first core member 180 are coupled to the under panel 70. The same applies to the second core material 190.

  The two first core members 180 are connected in a straight line via a joint 170 having a cross shape (X shape) in a plan view. The two second core members 190 are also connected in a straight line via the joint 170.

  As shown in FIG. 12 (c), on the back surface side of the joint 170, ribs 171 that continue the vertical wall portion of the first core member 180 or the vertical wall portion of the second core member 190 arranged in a straight line are provided. Is formed.

Moreover, it is good also as a structure shown to Fig.13 (a)-FIG.13 (b) about a 1st core material and a 2nd core material.
The under panel 70 is formed with a bead-shaped first core member 78 formed by raising a part thereof at a position corresponding to the first core member 80 (see FIG. 2). After the second core member 190 is joined to an appropriate position of the under panel 70 by welding or the like, the joint 170 is externally fitted to the first core member 78 and the second core member 190 from above. In this case, the rib 171 (see FIG. 12C) is not formed on the back surface of the joint 170.

With such a configuration, since the first core member 180 (see FIG. 12) can be omitted, the number of parts can be reduced while reducing the weight.
It goes without saying that such a configuration is also included in the technical scope.

DESCRIPTION OF SYMBOLS 1 Body floor structure 10 Side sill 11 Side sill inner 20 Front side frame 22 Extension part 29 Front cross member 40 Tunnel frame 41 Inclination part 42 Tunnel frame main-body part 49 Tunnel space 51 Tunnel cross member 55 Floor cross member 60 Floor panel 70 Under panel 80 1st 1 core material 90 2nd core material 210 Dashboard lower panel

Claims (6)

A side sill having a side sill inner and extending in the front-rear direction;
An extension on the rear side of the front side frame, extending along the dashboard lower panel while bending outward in the vehicle width direction, and an extension connected to the side wall of the front end of the side sill inner;
A tunnel frame extending obliquely from the inner side wall of the extension toward the rear inner side and then extending rearward at the center in the vehicle width direction;
A floor panel coupled to the side sill inner and the tunnel frame;
An under panel disposed below the floor panel;
A floor cross member extending in the vehicle width direction and coupled to the side sill inner and the tunnel frame;
Surrounded by the extension, the side sill inner, the floor cross member, and the tunnel frame, and coupled to the floor panel and the under panel while being sandwiched between the floor panel and the under panel, and having an X shape in plan view A core material,
With
The core material includes a first core material and a second core material,
The first core member is inclined with respect to the front-rear direction and the vehicle width direction, and extends toward the center in the vehicle width direction toward the rear side.
The second core member is inclined with respect to the front-rear direction and the vehicle width direction, and extends to approach the vehicle width direction outer side toward the rear side ,
A front end of the first core member is coupled to the side sill inner side of the extension portion .   In the tunnel space formed by the tunnel frame, the tunnel cross member extending in the vehicle width direction at the same position as the floor cross member in the front-rear direction,
  The rear end of the first core member is disposed at a joint portion between the tunnel cross member and the floor cross member,
  The front end of the second core member is coupled to a bent portion that bends from a portion extending obliquely to the rear portion of the tunnel frame,
  A rear end of the second core member is disposed at a joint portion between the side sill inner and the floor cross member.
  The vehicle body floor structure according to claim 1.   The first core member includes a vertical wall portion extending in the vertical direction and the longitudinal direction thereof,
  The vertical wall portion is continuous at the intersection of the first core material and the second core material.
  The vehicle body floor structure according to claim 1, wherein the vehicle body floor structure is provided. The first core member is coupled to the floor panel and the under panel in the longitudinal direction,
The vehicle body floor structure according to any one of claims 1 to 3, wherein the second core member is coupled to the floor panel and the under panel in the longitudinal direction. The vehicle body according to any one of claims 1 to 4 , wherein the under panel is coupled to a bottom surface of the extension portion, a bottom surface of the side sill inner, and a bottom surface of the tunnel frame. Floor structure. The first core member and / or the side sill inner and / or the tunnel frame coupling of the second core member, claims 1 to 5, characterized in that it comprises a bulkhead for reinforcing the coupling portion The vehicle body floor structure according to any one of the above.

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