JP6485200B2 - Vehicle floor structure - Google Patents

Description

The present invention
A pair of left and right cross members that connect the floor tunnel and the left and right side sill inners are joined side by side on the upper surface of the floor panels on the left and right sides of the floor tunnel,
On the left and right sides of the floor tunnel, a left seat mounting portion and a right seat mounting portion are disposed,
Each seat mounting portion relates to a vehicle floor structure including a first seat mounting bracket on the floor tunnel side and a second seat mounting bracket on the side sill inner side.

Conventionally, there has been a structure shown in FIG. 11 as the floor structure of the vehicle. Explaining this conventional structure, a pair of left and right cross members 4 connecting the floor tunnel 2 and the left and right side sill inners 3 are welded and joined side by side to the upper surface of the floor panel 1.
In addition, on the left and right sides of the floor tunnel 2, a seat attachment portion for the left seat and a seat attachment portion for the right seat are disposed separately.
Each seat mounting portion includes a first front seat mounting bracket 11 on the floor tunnel 2 side, a second front seat mounting bracket 12 on the side sill inner 3 side, a first rear seat mounting bracket 13 on the floor tunnel 2 side, and a side sill. And a second rear seat mounting bracket 14 on the inner 3 side.
The first front seat mounting bracket 11 is joined over the side wall 2 </ b> S of the floor tunnel 2 and the upper surface of one end of the cross member 4. The second front seat mounting bracket 12 is joined to the upper surface of the other end of the cross member 4. Reference symbol Fr is the vehicle front side, and Rr is the vehicle rear side. As a technique in which the cross member is provided on the upper surface of the floor panel, there is a technique disclosed in Patent Document 1.
In the above-described conventional structure, the left and right side walls 2S of the floor tunnel 2 to which the left and right first front seat mounting brackets 11 are separately joined are only connected via the upper wall 2J of the floor tunnel 2.

JP 2013-256172 A

In the above-described conventional vehicle floor structure, the left and right side walls 2S of the floor tunnel 2 are merely connected via the upper wall 2J of the floor tunnel 2, so that the rigidity of the floor tunnel 2 is not sufficient and the left side wall 2S The connection strength between the cross member and the right cross member was not sufficient.
As a result, the left side sill, the left side cross member, the floor tunnel, the right side cross member, and the right side sill cannot be firmly and continuously integrated, and the rigidity of the floor provided with the left and right seat mounting portions is reduced. As a result, floor vibration and vehicle interior noise were likely to occur.
An object of the present invention is to provide a vehicle floor structure that can sufficiently reduce vibration and vehicle interior sound.

The feature of the present invention is that
A pair of left and right cross members that connect the floor tunnel and the left and right side sill inners are joined side by side on the upper surface of the floor panels on the left and right sides of the floor tunnel,
On the left and right sides of the floor tunnel, a left seat mounting portion and a right seat mounting portion are disposed,
Each seat mounting portion is a vehicle floor structure including a first seat mounting bracket on the floor tunnel side and a second seat mounting bracket on the side sill inner side,
The first seat mounting bracket is joined across the side wall of the floor tunnel and the upper surface of one end of the cross member,
The second seat mounting bracket is joined to the upper surface of the other end of the cross member,
Tunnel braces are installed on the back surfaces of the joint portions of the left and right side walls of the floor tunnel to which the first seat mounting bracket is joined ;
An upper mounting portion provided at an upper end portion of the first seat mounting bracket is overlapped and joined to a front side surface of an upper corner portion formed by an upper wall and a side wall of the floor tunnel,
The upper wall of the first seat mounting bracket is located below the upper wall of the floor tunnel . (Claim 1)

According to the above configuration, the right end portion of the left cross member and the left end portion of the right cross member can be firmly connected via the pair of left and right first seat mounting brackets and the tunnel brace. The connection strength between the cross members can be improved.
As a result, the left side sill, the left cross member, the floor tunnel, the right cross member, and the right side sill can be firmly integrated and continued in the vehicle width direction simply by adding a relatively lightweight tunnel brace. .
As a result, the rigidity of the floor on which the left and right seat mounting portions are provided can be improved in a state in which an increase in weight is suppressed, and floor vibration and vehicle interior noise can be more reliably reduced.
In addition, since the upper mounting portion provided at the upper end portion of the first seat mounting bracket is overlapped and joined to the front side surface of the upper corner portion formed by the upper wall and the side wall of the floor tunnel, The effect | action can be show | played.
That is, the upper corner portion of the floor tunnel is more rigid than the other flat portion of the floor tunnel. As described above, since the upper mounting portion of the first seat mounting bracket is joined to the upper corner portion of the floor tunnel having rigidity, the joint strength between the first seat mounting bracket and the floor tunnel can be improved. (Claim 1)
In the present invention, the upper mounting portion is configured by an upper mounting wall having an L-shaped cross section that projects upward from one end on the floor tunnel side of the upper wall of the first seat mounting bracket,
The upper mounting wall may be configured to be overlapped and joined to a surface on the front side of the upper corner portion of the floor tunnel. (Claim 2)

In the present invention,
At one end of the cross member, a mounting flange projecting to the vehicle front side and a mounting flange projecting to the vehicle rear side are provided,
The first seat mounting bracket is provided with a mounting flange projecting to the vehicle front side and a mounting flange projecting to the vehicle rear side,
A mounting flange on the vehicle front side of the first seat mounting bracket and a side wall of the floor tunnel are integrally joined with the mounting flange on the vehicle front side of the cross member interposed therebetween,
If the mounting flange on the vehicle rear side of the first seat mounting bracket and the side wall of the floor tunnel are joined together with the mounting flange on the vehicle rear side of the cross member interposed therebetween, the following effects can be obtained. it can. (Claim 3 )

The joining strength between the one end of the cross member in the vehicle width direction and the side wall of the floor tunnel can be improved. (Claim 3 )

In the present invention,
The upper mounting portion provided at the upper end portion of the tunnel brace is superimposed on the back side surface of the upper corner portion of the floor tunnel,
When the upper mounting portion of the tunnel brace and the upper mounting portion of the first seat mounting bracket are joined together with the upper corner portion of the floor tunnel sandwiched therebetween, the following effects can be achieved. (Claim 4)

  The joint strength of the first seat mounting bracket, the floor tunnel, and the tunnel brace can be further improved. (Claim 4)

In the present invention,
The floor panel below the floor tunnel is opened, and a pair of left and right lower corners are formed by the side wall of the floor tunnel and the floor panel,
When the lower attachment portions provided at the lower left and right ends of the tunnel brace are overlapped and joined to the back side surfaces of the pair of left and right lower corner portions, the following effects can be obtained. it can. (Claim 5)

  A pair of left and right lower corners formed by the side wall of the floor tunnel and the floor panel has rigidity. In this way, the left and right lower mounting parts of the tunnel brace are joined to the back surface of the pair of left and right lower corners with rigidity, so the joint strength of the tunnel brace, floor panel, and floor tunnel Can be further improved. (Claim 5),

In the present invention,
At one end of the cross member, a mounting flange is provided that overlaps the front side surface of the lower corner portion,
When this attachment flange and the lower attachment portion of the tunnel brace are joined together with the lower corner portion interposed therebetween, the following effects can be obtained. (Claim 6)

  The joining strength of the one end part of the cross member, the tunnel brace, the floor panel, and the floor tunnel can be further improved. (Claim 6)

In the present invention,
The side sill inner is formed in a U-shaped cross section with the vehicle width direction outer side open,
When a bulkhead is installed between the upper and lower walls of the side sill inner in the vicinity of the joint with the cross member, the following effects can be achieved. (Claim 7)

  The joint strength between the side sill inner and the cross member can be improved. (Claim 7)

In the present invention,
A mounting flange extending outward in the vehicle width direction is provided at the side sill inner side end of the second seat mounting bracket,
When the mounting flange and the bulkhead are integrally joined with the upper wall of the side sill inner interposed therebetween, the following effects can be achieved. (Claim 8)

  The joint strength between the second seat mounting bracket and the side sill inner can be further improved. (Claim 8)

According to the present invention,
It was possible to provide a vehicle floor structure that can sufficiently reduce vibration and vehicle interior sound.

The perspective view which looked at the floor structure of the vehicle from the upper left of the vehicle The perspective view which looked at the floor structure of vehicles from the slanting lower part of vehicles The perspective view which looked at the floor structure of vehicles from the back upper left of vehicles Enlarged view showing the left seat attachment The perspective view which shows the joining state to the floor tunnel of the front and back tunnel braces View of the vehicle floor structure from below The perspective view which shows the joining state to the floor tunnel of a 1st front side seat mounting bracket. The perspective view which shows the joining state to the floor tunnel of a 1st back side seat mounting bracket. (A) is a perspective view which shows the joining state to the side sill inner of the 2nd front side seat attachment bracket of the left seat attachment part, (b) is AA sectional drawing of Fig.8 (a), (c) is BB sectional view of FIG. 8 (a) (A) is a perspective view showing a joining state of the pair of left and right first front seat mounting brackets and the pair of left and right first rear seat mounting brackets to the floor tunnel, and (b) is an upper end of the first front seat mounting bracket. The perspective view which shows the joining state to the floor tunnel etc. of a part, (c) is a perspective view which shows the joining state to the floor tunnel etc. of the upper end part of a 1st back side seat mounting bracket. A perspective view of a conventional vehicle floor structure

Hereinafter, embodiments of the present invention will be described with reference to the drawings.
As shown in FIGS. 1 and 3, a floor tunnel 2 bulging upward is formed along the vehicle front-rear direction at the center of the left and right sides of the floor panel 1. Also, a pair of left and right first cross members 4 that connect the floor tunnel 2 and the left and right side sill inners 3 along the vehicle longitudinal direction are welded and joined side by side on the upper surface of the floor panel 1 on both the left and right sides of the floor tunnel 2. Has been.

[Structure of floor tunnel 2]
The floor tunnel 2 has a trapezoidal vertical cross section when viewed from the front-rear direction of the vehicle, and a pair of left and right side walls 2S and a pair of left and right side walls 2S located on the center side in the width direction of the floor tunnel 2 toward the upper end. And an upper wall 2J for connecting the upper ends of the two. The floor panel 1 below the floor tunnel 2 is open.

[Structure of side sill]
The side sill inner 3 (side sill inner panel) is formed in a cross-sectional hat shape (provided with a U-shaped cross section) that is open on the outer side W2 in the vehicle width direction. The side sill inner 3 is integrally welded to a side sill outer (side sill outer panel) and a side sill reinforcement (both not shown) having a hat-shaped cross section with the vehicle width direction inner side W1 open. To do.

[Structure of the first cross member 4]
As shown in FIGS. 3 and 4, the first cross member 4 (corresponding to the cross member) is formed in a cross-sectional hat shape in which the lower side is open, and a pair of lower and front mounting flanges 4 </ b> F <b> 1 of the first cross member 4 are provided. It is welded to the floor panel 1.

  One end of the first cross member 4 in the longitudinal direction is provided with an attachment flange projecting to the vehicle front side Fr and an attachment flange 4F2 projecting to the vehicle rear side Rr. Further, at the other end of the first cross member 4 in the longitudinal direction, a mounting flange 4F3 (see FIG. 9C) projecting to the vehicle front side Fr and a mounting flange 4F3 projecting to the vehicle rear side Rr (FIG. 3, FIG. 3). 9c) is formed.

  Then, as shown in FIG. 3, the mounting flange 4F2 at the one end is welded to the side wall 2S of the floor tunnel 2, and as shown in FIG. 9C, the mounting flange 4F3 at the other end is a side sill. The inner wall 3 is welded to the vertical wall 3T.

[Structure of the sheet mounting portions 5 and 6]
As shown in FIG. 3, a seat attachment portion 5 for the left front seat and a seat attachment portion 6 for the right front seat are separately provided on the left and right sides of the floor tunnel 2.

  Each of the seat mounting portions 5 and 6 includes a first front seat mounting bracket 11 on the floor tunnel 2 side, a second front seat mounting bracket 12 on the side sill inner 3 side, and a first rear seat mounting bracket 13 on the floor tunnel 2 side. And a second rear seat mounting bracket 14 on the side sill inner 3 side.

  Corresponding parts between the respective seat mounting brackets 11, 12, 13, 14 of the left front seat mounting portion 5 and the respective seat mounting brackets 11, 12, 13, 14 of the right front seat mounting portion 6 Have the same structure and the same mounting structure. A pair of corresponding left and right seat mounting brackets (for example, the first front seat mounting bracket 11 on the left side and the first front seat mounting bracket 11 on the right side) are mounted symmetrically with respect to the left and right center of the floor tunnel 2.

  Hereinafter, the structure and the mounting structure of the respective seat mounting brackets 11, 12, 13, and 14 of the left front seat mounting portion 5 will be described, and the respective seat mounting brackets 11 and 12 of the right front seat mounting portion 6 will be described. , 13, 14 and the description of the mounting structure are omitted.

[Structure of first front seat mounting bracket 11 and its mounting structure]
As shown in FIGS. 4 and 10A, the first front seat mounting bracket 11 (corresponding to the first seat mounting bracket) of the left seat mounting portion 5 is inclined toward the floor tunnel 2 when viewed from the vehicle front-rear direction. The trapezoidal trapezoidal front wall 11M / rear wall 11K, the side wall 11S connecting the ends of the front wall 11M / rear wall 11K on the side sill inner 3 side (vehicle width direction outer side W2), and the front wall 11M And a rear wall 11K and a substantially horizontal upper wall 11J spanning the upper end of the side wall 11S. An attachment portion for the left front seat is provided on the upper wall 11J.

  The lower end portion of the front wall 11M and the lower end portion of the rear wall 11K are externally fitted to one end portion (right end portion) of the first cross member 4 and are welded and joined in the vehicle front-rear direction. A black circle in FIG. 10A is a welded portion A by spot welding. The black circles in the other figures also indicate the welded portion A. In addition, a mounting wall 11F having a U-shaped cross-section with the lower side opened as viewed from the vehicle width direction extends to the side sill inner 3 side at the lower end of the front wall 11M, the lower end of the rear wall 11K, and the lower end of the side wall 11S. It is connected to the state. The mounting wall 11F is externally fitted to one end of the first cross member 4 and welded.

  As shown in FIG. 10B, a pair of front and rear mounting flanges 11F1 project in the vehicle longitudinal direction from the end of the front wall 11M on the floor tunnel 2 side and the end of the rear wall 11K on the floor tunnel 2 side. ing. That is, the first front seat mounting bracket 11 is provided with the mounting flange 11F1 projecting to the vehicle front side Fr and the mounting flange 11F1 projecting to the vehicle rear side Rr.

  Then, the mounting flange 11F1 on the vehicle front side Fr of the first front seat mounting bracket 11 and the side wall 2S of the floor tunnel 2 are welded and joined together with the mounting flange on the vehicle front side Fr of the first cross member 4 interposed therebetween. Yes. Further, the mounting flange 11F1 on the vehicle rear side Rr of the first front seat mounting bracket 11 and the side wall 2S of the floor tunnel 2 are integrally welded together with the mounting flange 4F2 on the vehicle rear side Rr of the first cross member 4 interposed therebetween. ing. Thereby, the joining strength of the one end part of the vehicle width direction of the 1st cross member 4 and the side wall 2S of the floor tunnel 2 can be improved.

  As shown in FIGS. 4, 10A and 10B, an upper mounting wall 11F2 (upper side) having an L-shaped cross section from the upper end of both mounting flanges 11F1 and one end of the upper wall 11J on the floor tunnel 2 side. (Corresponding to the mounting portion) is protruding upward. The upper mounting wall 11F2 is overlapped and welded to the surface on the front side of the first upper corner portion 10 formed by the upper wall 2J and the side wall 2S of the floor tunnel 2.

  The first upper corner portion 10 of the floor tunnel 2 has rigidity. Thus, since the upper mounting wall 11F2 is welded to the first upper corner portion 10 of the floor tunnel having rigidity, the bonding strength between the first front seat mounting bracket 11 and the floor tunnel 2 is improved. Can do.

  As described above, the first front seat mounting bracket 11 is welded over the upper wall 2J, the side wall 2S, and the upper surface of one end of the first cross member 4 of the floor tunnel 2.

[Structure and Mounting Structure of Second Front Seat Mounting Bracket 12]
As shown in FIGS. 4, 9A, and 9B, the second front seat mounting bracket 12 (corresponding to the second seat mounting bracket) of the left seat mounting portion 5 is a floor tunnel toward the upper end side. The side wall 12S1 on the side sill inner 3 side inclined so as to be positioned on the second side, the side wall 12S2 on the side of the floor tunnel 2 inclined so as to be positioned on the side sill inner 3 side on the upper end side, and the upper end portions are connected to each other. And a substantially horizontal upper wall 12J. A mounting portion for the left front seat is provided on the upper wall 12J. The side wall 12S1 on the side sill inner 3 side is set to have a gentler slope than the side wall 12S2 on the floor tunnel 2 side.

  Also, a side wall 12S1 on the side sill inner 3 side is provided with a U-shaped attachment wall 12F having an open lower side when viewed from the vehicle width direction so as to extend toward the side sill inner 3 side. Has been. The mounting wall 12F is externally fitted to the upper surface of the other end (left end) of the first cross member 4 and welded. Further, a mounting flange 12F1 extends from the upper wall of the mounting wall 12F to the side sill inner 3 side. Thus, the mounting flange 12F1 extending to the vehicle width direction outer side W2 is provided at the end of the second front seat mounting bracket 12 on the side sill inner 3 side. The mounting flange 12F1 is welded to the upper wall 3J of the side sill inner 3.

  Further, a U-shaped mounting wall 12G having a lower open side when viewed from the vehicle width direction is continuously provided at the end of the side wall 12S2 on the floor tunnel 2 side so as to extend toward the floor tunnel 2 side. Has been. The attachment wall 12G is externally fitted to the upper surface of the first cross member 4 and welded.

  At both ends of the side wall 12S1 on the side sill inner 3 side, the side wall 12S2 on the floor tunnel 2 side, and the upper wall 12J in the vehicle front-rear direction, flanges 12F2 connected to the front and rear walls of the mounting walls 12F and 12G are formed. . Thereby, the rigidity of the second front seat mounting bracket 12 can be improved.

[Structure of second cross member 15]
As shown in FIGS. 1 and 3, a pair of left and right second cross members 15 (corresponding to cross members) connecting the first rear seat mounting bracket 13 and the second rear seat mounting bracket 14 are the floor panel. 1 is welded and joined side by side on the upper surface.

  The second cross member 15 is formed in a hat shape with an open bottom, and a pair of front and rear lower mounting flanges 15F1 of the second cross member 15 are welded to the floor panel 1.

[Structure of the first rear seat mounting bracket 13]
As shown in FIGS. 4, 10 (a) and 10 (c), the first rear seat mounting bracket 13 (corresponding to the first seat mounting bracket) of the left seat mounting portion 5 is viewed from the vehicle front-rear direction. The trapezoidal trapezoidal front wall 13M / rear wall 13K, the side wall 13S connecting the ends of the front wall 13M / rear wall 13K on the side sill inner 3 side, the front wall 13M, the rear wall 13K, and the side wall 13S. And an upper wall 13J spanning the upper end of the. The upper wall 13J is provided with a mounting portion for the left front seat.

  An attachment wall 13F having a hat-shaped cross section as viewed from the vehicle width direction is continuously provided at the lower ends of the front wall 13M, the rear wall 13K, and the side wall 13S so as to extend toward the side sill inner 3 side. The attachment wall 13F is externally fitted to the upper surface of one end (right end) of the second cross member 15 and welded. Further, a pair of front and rear mounting flanges 13F1 (see FIGS. 4 and 8) at the lower end of the mounting wall 13F are welded to the upper surface of the floor panel 1 and the lower mounting flange 15F1 of the front and rear pair of the second cross member 15. It is joined.

  As shown in FIG. 10C, a pair of front and rear mounting flanges 13F2 project in the vehicle longitudinal direction from the end of the front wall 13M on the floor tunnel 2 side and the end of the rear wall 13K on the floor tunnel 2 side. Yes. That is, the first rear seat mounting bracket 13 is provided with the mounting flange 13F2 projecting to the vehicle front side Fr and the mounting flange 13F2 projecting to the vehicle rear side Rr. Both mounting flanges 13F2 are welded to the side wall 2S of the floor tunnel 2.

  As shown in FIGS. 4, 10A and 10C, an upper mounting wall 13F3 (upper side) having an L-shaped cross section is formed from the upper end of both mounting flanges 13F2 and one end of the upper wall 13J on the floor tunnel 2 side. (Corresponding to the mounting portion) is protruding upward. The upper attachment wall 13F3 is overlapped and welded to the front surface of the second upper corner portion 20 formed by the upper wall 2J and the side wall 2S of the floor tunnel 2.

  As described above, the first rear seat mounting bracket 13 is welded over the upper wall 2J, the side wall 2S, and the upper surface of one end of the first cross member 4 of the floor tunnel 2.

[Structure of Second Rear Seat Mounting Bracket 14]
As shown in FIG. 4, the second rear seat mounting bracket 14 of the left seat mounting portion 5 includes a front wall and a rear wall 14K having the same shape, and between the front wall and the upper end of the rear wall 14K. An upper wall 14J is provided.

  The rear wall portion 14K1 on the floor tunnel 2 side is formed in a rectangular shape, and the rear wall portion 14K2 on the side sill inner 3 side is formed in a rectangular shape having a shorter vertical width than the rear wall portion 14K1 on the floor tunnel 2 side. . And the rear wall intermediate part 14K3 between these is formed in the trapezoid shape which narrows toward the side sill inner 3 side. A slit S is formed between the upper end of the rear wall portion 14K2 on the side sill inner 3 side and the upper wall 14J, and between the rear wall intermediate portion 14K3 and the upper wall 14J. The upper wall 14J is bent along the upper edge of each rear wall portion 14K1, 14K2, 14K3.

  A pair of front and rear mounting flanges 14F1 projecting in the vehicle front-rear direction are formed at the lower end of the rear wall portion 14K1 on the floor tunnel 2 side. The mounting flange 14F1 and the floor panel 1 are integrally welded together with the mounting flange 15F1 of the second cross member 15 interposed therebetween.

  A pair of front and rear mounting flanges 14F2 projecting to the vehicle rear side Rr at the end of the rear wall portion 14K2 on the side sill inner 3 side (see FIG. 3, the mounting flange 14F2 in FIG. 3 is the right front seat). This is the structure of the sheet mounting portion 6 for use. The attachment flange 14F2 is welded to the side wall 3T of the side sill inner 3.

  Further, as shown in FIG. 4, a mounting flange 14F3 extending to the side sill inner 3 side is formed at the end of the upper wall 14J on the side sill inner 3 side, and this mounting flange 14F3 is welded to the upper wall 3J of the side sill inner 3. It is joined.

[Structure of front tunnel brace 17]
As shown in FIGS. 2, 3, 5, 6, and 10 (b), the front tunnel brace is formed on the back surface of the joint portion of the left and right side walls 2 </ b> S of the floor tunnel 2 to which the first front seat mounting bracket 11 is joined. 17 (corresponding to a tunnel brace) is installed.

  The front side tunnel brace 17 is formed in a cross-sectional hat shape whose upper side is opened as viewed from the vehicle width direction. The front wall 17M and the rear wall 17K of the front side tunnel brace 17 are formed in a trapezoidal shape when viewed from the vehicle front-rear direction. And the attachment flange 17F1 formed in the peripheral part of the front wall 17M and the rear wall 17K is welded to the back surface of the upper wall 2J of the floor tunnel 2 and the back surfaces of the left and right side walls 2S.

  More specifically, as shown in FIGS. 5 and 10 (b), the mounting flange 17F1 (corresponding to the upper mounting portion) protruding from the upper corner portion of the upper ends of the front wall 17M and the rear wall 17K is a floor tunnel. The second first upper corner portion 10 is superposed on the back surface. The mounting flange 17F1 and the upper mounting wall 11F2 of the first front seat mounting bracket 11 are integrally welded together with the first upper corner portion 10 of the floor tunnel 2 interposed therebetween. Thereby, the joining strength of the 1st front side seat attachment bracket 11, the floor tunnel 2, and the front side tunnel brace 17 can be improved more.

  As shown in FIG. 5, the upper ends of a pair of left and right front reinforcements 37 that are long in the vertical direction are welded to the left and right lower ends of the front tunnel brace 17. The front reinforcement 37 has a hat-shaped cross section, and is inclined so as to be located on the outer side in the width direction of the floor tunnel 2 toward the lower end side, and along the side wall 2S of the floor tunnel 2.

  A lower end portion of the front reinforcement 37 is configured as an L-shaped attachment wall 37F (corresponding to a lower attachment portion) when viewed from the vehicle width direction. Instead of this structure, a structure in which the attachment wall 37F is integrally provided at the lower end of the front tunnel brace 17 may be employed. Then, the mounting walls 37F of the pair of left and right front reinforcements 37 are superimposed on the back surfaces of the pair of left and right first lower corner portions 30 formed by the side walls 2S of the floor tunnel 2 and the floor panel 1, respectively. .

  Further, mounting flanges 4F4 (see FIG. 7) projecting from lower corner portions formed at one end portions of the pair of left and right first cross members 4 are formed on the front side surface of the pair of left and right first lower corner portions 30. The mounting flange 4F4 and the mounting wall 37F overlap each other and are integrally welded with the first lower corner portion 30 interposed therebetween.

  The first lower corner portion 30 has rigidity. Thus, since the left and right mounting walls 37F of the front tunnel brace 17 are joined to the back surfaces of the pair of left and right first lower corner portions 30 having rigidity, the front tunnel brace 17 and the floor panel are joined separately. The bonding strength between 1 and the floor tunnel 2 can be improved. Further, since the mounting flange 4F4 and the mounting wall 37F are integrally welded together with the first lower corner portion 30 interposed therebetween, the bonding strength can be further improved.

[Structure of rear tunnel brace 18]
As shown in FIGS. 2, 3, 5, and 10 (c), the rear tunnel brace 18 is formed on the back surface of the joint portion of the left and right side walls 2 </ b> S of the floor tunnel 2 to which the first rear seat mounting bracket 13 is joined. (Equivalent to tunnel brace) is built.

  The rear side tunnel brace 18 is formed in a cross-sectional hat shape whose upper side is opened as viewed from the vehicle width direction. The front wall 18M and the rear wall 18K of the rear tunnel brace 18 are formed in a trapezoidal shape when viewed from the vehicle front-rear direction. An attachment flange 18F1 that is formed to protrude from the peripheral portions of the front wall 18M and the rear wall 18K is welded to the back surface of the upper wall 2J of the floor tunnel 2 and the back surfaces of the left and right side walls 2S.

  More specifically, as shown in FIG. 10 (c), the mounting flange 18F1 (corresponding to the upper mounting portion) protruding from the upper corner portions of the upper ends of the front wall 18M and the rear wall 18K is the first of the floor tunnel 2. 2 Overlaid on the back surface of the upper corner portion 20. The mounting flange 18F1 and the upper mounting wall 13F3 of the second front seat mounting bracket 13 are integrally welded together with the second upper corner portion 20 of the floor tunnel 2 interposed therebetween.

  As shown in FIG. 5, the upper ends of a pair of left and right rear reinforcements 38 that are long in the vertical direction are welded to the left and right lower ends of the rear tunnel brace 18. The rear reinforcement 38 has a hat shape in cross section, and is inclined so as to be positioned on the outer side in the width direction of the floor tunnel 2 toward the lower end side, and along the side wall 2S of the floor tunnel 2.

  A lower end portion of the rear reinforcement 38 is configured as an L-shaped attachment wall 38F (corresponding to a lower attachment portion) when viewed from the vehicle width direction. Instead of this structure, a structure in which the attachment wall 38F is integrally provided at the lower end portion of the rear tunnel brace 18 may be employed. Then, the mounting walls 38F of the pair of left and right rear reinforcements 38 are superimposed on the back surfaces of the pair of left and right second lower corner portions 40 formed by the side wall 2S of the floor tunnel 2 and the floor panel 1, respectively. Yes.

  Further, as shown in FIG. 8, mounting flanges 13F4 projecting from the front wall 13M and the rear wall 13K of the pair of left and right second front seat mounting brackets 13 are provided on the front side surface of the pair of left and right second lower corner portions 40. The mounting flange 13F4 and the mounting wall 38F are integrally welded together with the second lower corner portion 40 interposed therebetween.

[Structure of bulkhead 19]
As shown in FIGS. 1, 9 (a), and 9 (b), the joint between the upper and lower walls 3 J, 3 K of the side sill inner 3 near the joint with the first cross member 4 and the second cross member 15. A bulkhead 19 is installed between the upper and lower walls 3J, 3K of the side sill inner 3 near the portion.

  The bulkhead 19 has a vertically long vertical wall 19T whose wall faces in the vehicle front-rear direction, a peripheral wall 19S extending from the upper and lower ends of the vertical wall 19T and the end of the vehicle width direction inner side W1 to the vehicle rear side Rr, and a peripheral wall It comprises mounting flanges 19F1, 19F2, and 19F3 extending from the upper and lower ends of 19S and the intermediate portion in the vertical direction to the vehicle rear side Rr.

  Then, a pair of upper and lower mounting flanges 19F1 and 19F2 are welded to the inner surfaces of the upper wall 3J and the lower wall 3K of the side sill inner 3, respectively, and the mounting flange 19F2 at the middle in the vertical direction is attached to the inner surface of the vertical wall 3T of the side sill inner 3. It is welded.

  As shown in FIG. 9B, the mounting flange 12F1 of the second front seat mounting bracket 12 and the upper mounting flange 19F1 of the bulkhead 19 are integrally welded with the upper wall 3J of the side sill inner 3 interposed therebetween. Yes. Thereby, the joint strength of the 2nd front side sheet | seat attachment bracket 12 and the side sill inner 3 can be improved more.

  Further, the mounting flange 14F3 provided on the second rear seat mounting bracket 14 and the mounting flange 19F1 of the bulkhead 19 are integrally welded together with the upper wall 3J of the side sill inner 3 interposed therebetween. Thereby, the joint strength of the 2nd rear side seat attachment bracket 14 and the side sill inner 3 can be improved more.

According to the present invention,
The right end portion of the left first cross member 4 (second cross member 15) and the left end portion of the right first cross member 4 (second cross member 15) are connected to a pair of left and right first front seat mounting brackets 11 ( The first rear seat mounting bracket 13) and the front tunnel brace 17 (rear tunnel brace 18) can be firmly connected, and the pair of left and right first cross members 4 (second cross members 15) are connected to each other. Strength can be improved.
As a result, by simply adding a relatively lightweight front tunnel brace 17 (rear tunnel brace 18), the left side sill, the left first cross member 4 (second cross member 15), the floor tunnel 2, the right side The 1 cross member 4 (second cross member 15) and the right side sill can be firmly integrated and continuous in the vehicle width direction.
As a result, the rigidity of the floor on which the left and right seat mounting portions 5 and 6 are provided can be improved in a state in which an increase in weight is suppressed, and floor vibration and vehicle interior noise can be more reliably reduced. it can.

1 Floor panel 2 Floor tunnel 2J Floor tunnel upper wall 2S Floor tunnel side wall 3 Side sill inner 3J Side sill inner upper wall 3K Side sill inner lower wall 4 (First) Cross member 4F2 ) Mounting flange Mounting flange 4F4 projecting to the rear side of the vehicle (first member) Overlaying the front surface of the lower corner (first) Crossing member mounting flange 5 Seat mounting portion 6 for the left seat Seat for the right seat (First) upper corner portion 11 first (front) seat mounting bracket 11F1 mounting flange (of the first seat mounting bracket) projecting to the vehicle front side or vehicle rear side,
11F2 Upper mounting portion 12 at the upper end of the first seat mounting bracket 12 Second (front) seat mounting bracket 12F1 Mounting flange 13 extending outward in the vehicle width direction of the second (front) seat mounting bracket 13 First (rear) seat mounting bracket 13F3 Upper mounting portion 13F4 of upper end portion of first seat mounting bracket 13F4 Overlaying surface of lower corner portion (second) mounting flange 14 of second cross member Second (rear side) seat mounting bracket 14F1 Second (rear side) Mounting flange 15 extending outward in the vehicle width direction of the seat mounting bracket (second) cross member 17 (front side) tunnel brace 17F1 (front side) tunnel brace upper mounting portion 18 (rear side) tunnel brace 18F1 (rear side) tunnel brace Upper mounting part 9 Bulkhead 20 (Second) Upper corner portion 30 (First) Lower corner portion 37F (Front side) Lower attachment portion 38F of tunnel brace (Rear side) Lower attachment portion 40 of tunnel brace (Second) Lower side Corner Fr Vehicle front side Rr Vehicle rear side W2 Vehicle width direction outside

Claims (8)

A pair of left and right cross members that connect the floor tunnel and the left and right side sill inners are joined side by side on the upper surface of the floor panels on the left and right sides of the floor tunnel,
On the left and right sides of the floor tunnel, a left seat mounting portion and a right seat mounting portion are disposed,
Each seat mounting portion is a vehicle floor structure including a first seat mounting bracket on the floor tunnel side and a second seat mounting bracket on the side sill inner side,
The first seat mounting bracket is joined across the side wall of the floor tunnel and the upper surface of one end of the cross member,
The second seat mounting bracket is joined to the upper surface of the other end of the cross member,
Tunnel braces are installed on the back surfaces of the joint portions of the left and right side walls of the floor tunnel to which the first seat mounting bracket is joined ;
An upper mounting portion provided at an upper end portion of the first seat mounting bracket is overlapped and joined to a front side surface of an upper corner portion formed by an upper wall and a side wall of the floor tunnel,
The vehicle floor structure , wherein an upper wall of the first seat mounting bracket is located below the upper wall of the floor tunnel . The upper mounting portion is constituted by an upper mounting wall having an L-shaped cross section that projects upward from one end on the floor tunnel side of the upper wall of the first seat mounting bracket.
The vehicle floor structure according to claim 1, wherein the upper mounting wall is overlapped and joined to a front surface of an upper corner portion of the floor tunnel . At one end of the cross member, a mounting flange projecting to the vehicle front side and a mounting flange projecting to the vehicle rear side are provided,
The first seat mounting bracket is provided with a mounting flange projecting to the vehicle front side and a mounting flange projecting to the vehicle rear side,
A mounting flange on the vehicle front side of the first seat mounting bracket and a side wall of the floor tunnel are integrally joined with the mounting flange on the vehicle front side of the cross member interposed therebetween,
3. The vehicle according to claim 1, wherein a mounting flange on the vehicle rear side of the first seat mounting bracket and a side wall of the floor tunnel are integrally joined with a mounting flange on the vehicle rear side of the cross member interposed therebetween. Floor structure. The upper mounting portion provided at the upper end portion of the tunnel brace is superimposed on the back side surface of the upper corner portion of the floor tunnel,
The upper attachment part of the said tunnel brace and the upper attachment part of the said 1st sheet | seat attachment bracket are integrally joined on both sides of the upper corner part of the said floor tunnel. Vehicle floor structure. The floor panel below the floor tunnel is opened, and a pair of left and right lower corners are formed by the side wall of the floor tunnel and the floor panel,
The lower attachment part provided in the lower end part of the right-and-left both sides of the said tunnel brace is overlapped and joined separately to the surface of the back side of the said left-right pair of lower corner part. Vehicle floor structure described in 1. At one end of the cross member, a mounting flange is provided that overlaps the front side surface of the lower corner portion,
The vehicle floor structure according to claim 5, wherein the mounting flange and a lower mounting portion of the tunnel brace are integrally joined with the lower corner portion interposed therebetween. The side sill inner is formed in a U-shaped cross section with the vehicle width direction outer side open,
The vehicle floor structure according to any one of claims 1 to 6, wherein a bulkhead is provided between upper and lower walls of the side sill inner near a joint portion with the cross member. A mounting flange extending outward in the vehicle width direction is provided at the side sill inner side end of the second seat mounting bracket,
The vehicle floor structure according to claim 7, wherein the mounting flange and the bulkhead are integrally joined with an upper wall of the side sill inner interposed therebetween.

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