JPH06115460A - Floor structure for automobile - Google Patents

Abstract

PURPOSE:To reduce load to a joint section combining a front floor panel with a rear floor cross member by providing an extension section for a cross member reinforcing section, and thereby spotwelding the extension section with a bolt anchor reinforcing section. CONSTITUTION:Load inputted to the side wall section 12B of a floor tunnel section 12 formed over a front floor panel 10 is transmitted to a rear floor cross member 24 via a joint section combining the front floor panel 10 with the rear floor cross member 24. Concurrently load inputted to the extension section 32 of a cross member reinforcing section 30 is transmitted to the rear floor cross member 24 via the cross member reinforcing section 30 spotwelded with a bolt anchor reinforcing member 14. This constitution thereby allows load inputted to a joint section combining the front floor panel 10 with the rear floor cross member 24, to be lowered. In addition, since the front floor panel 10 is connected to a center floor panel 26 at the cross member reinforcing section 30 within a closed cross sectional structure, space within a cabin is not impaired.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an automobile floor structure, and more particularly to an automobile floor structure at a joint between a center floor panel and a rear floor cross member.

[0002]

2. Description of the Related Art Conventionally, an end portion of a seat belt of a rear seat of an automobile is attached near a rear end portion of a side wall of a floor tunnel portion formed on a front floor panel. Therefore, the vicinity of the rear end of the side wall of the floor tunnel needs to be configured to sufficiently withstand the tensile force of the seat belt, and the rigidity of the vicinity of the rear end of the side wall of the floor tunnel is improved. An example is the actual Kaihei 2-121
No. 382.

As shown in FIG. 4, in this automobile floor structure, both ends of a crank-shaped rear floor cross member 72 in the vehicle width direction are fixed to a rear floor side member 70, and a rear floor panel 74 is provided above the rear floor cross member 72. The front portion (which may be a center floor panel) is overlapped, and the front end portion 74A of the rear floor panel 74 is extended and fixed to the middle portion of the lower horizontal portion 72A of the rear floor cross member 72. In addition, the main floor panel 7
The rear part of 6 (may be a front floor panel) is overlapped on the front part of the rear floor panel 74, and the rear end part 76A is extended to the upper horizontal part 72B of the rear floor cross member 72,
The rear end portion 76A of the main floor panel 76 is fixed to the upper horizontal portion 72B of the rear floor cross member 72 with the front portion 74B of the rear floor panel 74 interposed therebetween.

[0004]

However, when the floor structure of this automobile is applied to a vehicle body having a bench seat for three persons in the rear seat, both sides of the floor tunnel portion 78 formed in the main floor panel 76 are applied. Wall 78A
The ends of the two seat belts 80 and 82 are joined to the vicinity of the rear end by belt anchors 84 and 86, respectively. Therefore, a large load acts on the connecting portions 88 and 90 of the main floor panel 76 and the rear floor cross member 72 due to the loads input from the belt anchors 84 and 86. Therefore, it is necessary to provide a reinforcing member at the joint between the main floor panel 76 (front floor panel) and the rear floor cross member 72.

In view of the above facts, an object of the present invention is to provide an automobile floor structure capable of reducing a load applied to a connecting portion between a front floor panel and a rear floor cross member.

[0006]

A floor structure of an automobile according to the present invention comprises a floor tunnel portion formed on a front floor panel, a center floor panel provided on the rear side of the front floor panel, and the center floor. A rear floor cross member that is connected to a panel and forms a closed cross-section structure that extends along the vehicle width direction at the rear end of the floor tunnel portion, and a cross member reinforcement arranged so as to cross the closed cross-section structure. In an automobile floor structure, an extension portion reaching a floor tunnel portion is provided in a vehicle width direction central portion of the cross member reinforcement.
This extension is spot-joined to a belt anchor reinforcement provided inside the floor tunnel.

[0007]

In the vehicle floor structure according to the present invention, the load input to the side wall portion of the floor tunnel portion by the seat belt is transmitted to the rear floor cross member through the joint portion between the front floor panel and the rear floor cross member. At the same time, the extended portion is also transmitted to the cross member reinforcement which is spot-connected to the belt anchor reinforcement which is provided inside the floor tunnel portion, and is transmitted to the rear floor cross member via the cross member reinforcement.

Therefore, the load applied to the joint between the front floor panel and the rear floor cross member can be reduced. Further, since the joint portion between the rear floor cross member and the center floor panel is a long region along the vehicle width direction, it can withstand a sufficiently large load. Further, since the front floor panel and the center floor panel are connected to each other by the cross member reinforcement that traverses the closed cross section structure, a separate member is not required outside and the vehicle interior space is damaged.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of an automobile floor structure according to the present invention will be described with reference to FIGS.

In the figure, the arrow FR indicates the front direction of the vehicle body, and the arrow UP indicates the upward direction of the vehicle body. As shown in FIG. 1, in the floor structure for a vehicle according to this embodiment, a floor tunnel portion 12 is formed in a vehicle width direction central portion of a front floor panel 10 along the vehicle body front-rear direction. The floor tunnel portion 12 has a substantially U-shaped cross-sectional shape as viewed from the front-rear direction of the vehicle body, with an opening facing downward.
The distance between the side wall portions 12B and 12C gradually increases from the opening to the opening.

A belt anchor reinforcement 14 is provided inside the floor tunnel portion 12, that is, inside the U-shaped portion. This belt Ankari reinforcement 14
Has a substantially U-shaped cross-sectional shape as viewed from the front-rear direction of the vehicle body. The upper wall portion 14A faces the upper wall portion 12A of the floor tunnel portion 12, and both side wall portions 14
B and 14C are both side wall portions 12B of the floor tunnel portion 12,
12C, respectively. The lower end of the side wall portion 14B of the belt anchor reinforcement 14 is bent outward in the vehicle width direction to form a flange 14D, which is welded to the lower surface 10A of the front floor panel 10. on the other hand,
The lower end portion of the side wall portion 14C of the belt anchor reinforcement 14 is bent outward in the vehicle width direction to form a flange 14E, which is welded to the lower surface 10A of the front floor panel 10.

The side wall portion 12B of the floor tunnel portion 12 and the side wall portion 14B of the belt anchor reinforcement 14 are
A belt anchor mounting hole 16 penetrating both is formed, and a similar belt anchor mounting hole 18 is formed in the vicinity of the front side of the belt anchor mounting hole 16. Further, weld nuts 20 and 22 are welded coaxially with the belt anchor mounting holes 16 and 18 inside the belt anchor reinforcement 14, that is, inside the U-shape, and these weld nuts 20 and 22 are Belt anchors provided at the ends of the seat belt (not shown) are fixed by bolts.

The other side wall portion 12C of the floor tunnel portion 12 has a similar structure.

A rear floor cross member 24 is provided on the rear side of the front floor panel 10, and both ends in the vehicle width direction of the rear floor cross member 24 are welded to a rear floor side member (not shown). The rear floor cross member 24 has a crank shape when viewed from the vehicle width direction, and a front wall portion 24B extends substantially downward from the front end portion of the lower wall portion 24A. The lower end portion of the front wall portion 24B of the rear floor cross member 24 is
It is bent forward to form a flange 24C, and is welded to the rear end edge portion 10C of the upper surface 10B of the front floor panel 10.

The front wall portion 24B of the rear floor cross member 24 has a portion facing the floor tunnel portion 12,
A cutout 25 is formed, and the rear end of the floor tunnel portion 12 is inserted into the cutout 25. Around the notch 25, a flange 24D is formed toward the front, and the flange 24D is welded to the outer peripheral portion of the rear end of the floor tunnel portion 12.

As shown in FIG. 2, a rear wall portion 24E is formed substantially upward from a rear end portion of the lower wall portion 24A of the rear floor cross member 24, and an upper end portion of the rear wall portion 24E is formed. A flange 24F is formed rearward.

Above the rear floor cross member 24,
There is a front portion of the center floor panel 26, and a front wall portion 26B is formed downward from a front end portion of a general surface 26A of the center floor panel 26. Further, a flange 26C is formed from the lower end portion of the front wall portion 26A of the center floor panel 26 substantially forward, and the flange 26C is
Spot connection (connection point P1) is made to the front portion of the lower wall portion 24A of the rear floor cross member 24.

A flange 24F of the rear floor cross member 24 is spot-joined (joint point P2) to the general surface 26A of the center floor panel 26, and the center floor panel 26 and the rear floor cross member 24 are closed to extend in the vehicle width direction. A cross sectional structure 28 is formed.

Within this closed cross-section structure 28, a cross member reinforcement 30 is arranged which crosses the closed cross section from the rear upper side of the vehicle body to the lower front side of the vehicle body. This cross member reinforcement 30 is provided on the rear floor cross member 2
4, the flange 30A formed rearward at the rear end portion is provided with the general surface 26A of the center floor panel 26 and the flange 2 of the rear floor cross member 24.
Spot connection (bonding point P2) is made with 4F.
Also, at the front end of the cross member reinforcement 30,
A flange 30B is formed substantially forward, and the flange 30B is spot-joined (joint point P1) between the flange 26C of the center floor panel 26 and the front portion of the lower wall portion 24A of the rear floor cross member 24. ing.

The flange 30 of the cross member reinforcement 30 facing the upper wall portion 12A of the floor tunnel portion 12
The portion B is the lower wall portion 24 of the rear floor cross member 24.
An extension portion 32 is provided along the line A and extends toward the front of the vehicle body. The extension portion 32 of the cross member reinforcement 30
Is spot-joined (joint point P3) to the flange 24D of the rear floor cross member 24 and the upper wall portion 12A of the floor tunnel portion 12.

The front end portion 32A of the extending portion 32 of the cross member reinforcement 30 extends further forward than the flange 24D of the rear floor cross member 24, and is located above the rear end portion 14F of the upper wall portion 14A of the belt anchor reinforcement 14. Has reached the upper wall 12 of the floor tunnel 12
Upper wall part 1 of the belt anchor reinforcement 14 across A
Spot connection (connection point P4) is made to the rear end portion 14F of 4A.

Next, the operation of this embodiment will be described. In the vehicle floor structure of the present embodiment, the loads (arrows F1 and F2 in FIG. 2) input to the side wall portions 12B and 12C of the floor tunnel portion 12 by the seat belt anchors are generated by the front floor panel 10 and the rear floor cross member 24. Rear floor cross member 24 through the connecting portion (connection point P3) of
And the extension 32 is also transmitted to the cross member reinforcement 30 that is spot-joined (joint point P4) to the belt anchor reinforcement 14 provided inside the floor tunnel 12 with the floor tunnel 12 in between. , And is transmitted to the rear floor cross member 24 via the cross member reinforcement 30. Therefore, the load acting on the connecting portion between the front floor panel 10 and the rear floor cross member 24 is distributed to the connecting points P3 and P4. Therefore, the connecting portion between the front floor panel 10 and the rear floor cross member 24, that is, the connecting point P3
The load applied to can be reduced.

Further, the strength of the connecting portion between the front floor panel 10 and the rear floor cross member 24 can be adjusted by changing the plate thickness of the cross member reinforcement 30 which is the smallest among the respective members, so that the weight efficiency is good.

Further, the connecting portion between the rear floor cross member 24 and the center floor panel 26 (the connecting point P1 and the connecting point P)
Since 2) is a long region along the vehicle width direction, it can withstand a sufficiently large load.

Further, since the front floor panel 10 and the center floor panel 26 are connected to each other by the cross member reinforcement 30 that crosses the inside of the closed sectional structure 28,
There is no need for a separate external member, and the interior space of the vehicle is impaired.

The present invention is not limited to the above embodiment,
For example, as shown in FIG. 3, the front floor panel 1
0 and the rear floor cross member 24, the center portion of the center floor panel 26 in the vehicle width direction is extended forward in a closed cross-section structure 29 extending in the vehicle width direction to form a cross member reinforcement 30. Good, in this case, the extended portion 32 of the cross member reinforcement 30 is spot-joined to the flange 24D of the rear floor cross member 24 and the upper wall portion 12A of the floor tunnel portion 12 (joint point P
3) In addition, the front end portion 32A of the extended portion 32 of the cross member reinforcement 30 is spot-bonded to the upper wall portion 12A of the floor tunnel portion 12 with the rear end portion 14F of the upper wall portion 14A of the belt anchor reinforcement 14 interposed therebetween ( Connect point P4).

[0027]

The floor structure of an automobile according to the present invention includes a floor tunnel portion formed on a front floor panel,
A center floor panel provided on the rear side of the front floor panel, a rear floor cross member that is connected to the center floor panel and forms a closed cross-section structure that extends along the vehicle width direction at the rear end of the floor tunnel portion, and a closed cross-section structure In a floor structure of an automobile having a cross member reinforcement arranged so as to cross the inside, an extension portion reaching a floor tunnel portion is provided in a vehicle width direction central portion of the cross member reinforcement, and the extension portion is a floor tunnel portion. Since it is configured to be spot-coupled to the belt anchor reinforce provided inside, there is an excellent effect that the load applied to the joint between the front floor panel and the rear floor cross member can be reduced.

[Brief description of drawings]

FIG. 1 is a perspective view showing a floor structure of an automobile according to an embodiment of the present invention as seen from an obliquely upper front side of a vehicle body.

FIG. 2 is a sectional view taken along line 2-2 of FIG.

FIG. 3 is a sectional view corresponding to FIG. 2, showing a floor structure of an automobile according to another embodiment of the present invention.

FIG. 4 is a perspective view showing a floor structure of an automobile according to a conventional example as seen from an obliquely upper front side of a vehicle body.

[Explanation of symbols]

 10 Front Floor Panel 12 Floor Tunnel Part 12B Side Wall Part 12C Side Wall Part 14 Belt Anchor Reinforce 16 Belt Anchor Mounting Hole 18 Belt Anchor Mounting Hole 24 Rear Floor Cross Member 26 Center Floor Panel 28 Closed Section Structure 29 Closed Section Structure 30 Cross Member Reinforcement 32 Extension Facility

Claims (1)

[Claims] 1. A floor tunnel portion formed on a front floor panel, a center floor panel provided on a rear side of the front floor panel, and a vehicle connected to the center floor panel at a rear end portion of the floor tunnel portion. In a floor structure of an automobile having a rear floor cross member forming a closed cross-section structure extending along the width direction and a cross member reinforcement arranged so as to cross the closed cross-section structure, a vehicle width direction of the cross member reinforcement An automobile floor structure characterized in that an extension portion reaching the floor tunnel portion is provided in a central portion, and the extension portion is spot-bonded to a belt anchor reinforcement which is provided inside the floor tunnel portion.