JPH1199967A - Floor construction of vehicle body - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reduce bending moment acting on a cross member by providing a fragile part having a nearly triangular notch in the vicinity of the side sill of the cross member, and providing the joint point of a side sill brace with a side sill outer at a lower part than the floor height. SOLUTION: A nearly triangular fragile part 4d constituted of a member 4b and the like is provided in the vicinity of the side sill 2 of a cross member 4. The joint point 5c of a side sill outer with a brace 5 is positioned lower than the fragile part 4d. By side collision, bending moment M1 is generated in a center pillar 1, and a load F2 is transmitted around the floor. Because the joint point 5c exists lower than the fragile part 4d, the side sill 2 is deformed in nearly parallel with the vehicle width direction. The load F2 and bending moment M3 generated due to it act on the cross member 4a. As deformation of a vehicle body is progresed, the member 4b is crashed from the extreme end, hence the input point of the load F2 transmitted to the member 4a is moved downward, and the bending moment M3 is reduced.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a vehicle body floor structure.

[0002]

2. Description of the Related Art As a conventional floor structure of a vehicle body, there has been one disclosed in, for example, Japanese Patent Application Laid-Open No. 7-89462.

[0003]

However, in such a conventional vehicle body floor structure, when the center pillar is deformed inside the vehicle cabin due to a side collision or the like, the load in the vehicle width direction and the vehicle width are applied to the cross member. There is a problem that a bending moment is generated around the longitudinal axis, the cross member is deformed by the bending moment, and the reaction force in the vehicle width direction is reduced (see FIG. 15B).

The present invention has been made in view of such a conventional problem, and reduces a bending moment acting on a cross member to generate a high reaction force in the axle direction (FIG. 16).
(See (a)) to solve the above problem.

[0005]

SUMMARY OF THE INVENTION In order to solve the above-mentioned problems, the present invention provides a center pillar which is formed in a closed cross-section by a pillar inner and a pillar outer to form a body vertical frame member, a side sill inner and a side sill outer. Side sill that is formed in a closed section at the lower part of the center pillar and extends in the front-rear direction of the vehicle body, a floor joined near the upper end of the side sill, and a cross joint that is joined and fixed under the floor and the end is fixed to the side sill In a floor structure of a vehicle body comprising a member and a brace disposed in the vicinity of a cross member inside the side sill and installed in a direction separating the side sill in the vehicle front-rear direction, an approximately triangular triangle protruding upward in the vehicle near the side sill of the cross member. A fragile part with a notch in the shape is provided, and the joining point of the side sill brace to the side sill outer is Wherein the remote provided below.

Further, the present invention is characterized in that, in the floor structure of the vehicle body, the shape of the cutout portion of the cross member is such that the base angle of the substantially triangular vehicle center side is 90 degrees or more.

Further, the present invention is characterized in that, in the floor structure of the vehicle body, a reinforcing member having a bead disposed in the vehicle front-rear direction is provided on a lower surface of the notch of the cross member.

[0008]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a perspective view of a vehicle floor structure according to an embodiment of the present invention.

(First Embodiment) FIGS. 1 to 8 show a first embodiment of a vehicle body floor structure according to the present invention. FIG. 1 is a perspective view showing the configuration of the first embodiment,
FIG. 2 is a front view of the first embodiment, FIG. 3 is an exploded view of the first embodiment, and FIGS. 4 to 8 are diagrams for explaining effects of the first embodiment.

First, the configuration will be described with reference to FIGS. 1 indicates a center pillar, 2 indicates a side sill, and 3 indicates a floor. 4 is a member 4a close to the center of the vehicle with the fragile portion 4d as a boundary
And a member 4b on the side sill 2 side and a member 4c for joining the two members 4a, 4b.
In the fragile portion 4d, each member has a shape such that a substantially triangular shape formed of the members 4a, 4b, and 4c has a base angle of 90 degrees or more on the vehicle center side of the base angle. 5a, 5b
Indicates a brace disposed in the side sill 2 at a position facing the cross member member 4b. The joining point 5c of the brace 5 with the side sill outer is the cross member weak portion 4
It is located below d. Reference numeral 6 denotes a reinforcing member disposed in the vehicle front-rear direction.

Next, the operation of the first embodiment will be described with reference to FIGS. The collision vehicle 10
When an external force F acts on the side of the vehicle body, a bending moment M1 is generated in the center pillar 1, and the load F is transmitted as F1 around the roof and F2 around the floor. (FIG. 4
reference)

The load F2 around the floor is input from a sill brace 5c, which is a junction with the side sill outer. Since the input point 5c exists below the weakened cross member 4d that supports the floor in the vehicle width direction, a bending moment M2 around the weakened cross member 4d is generated. As described above, since two bending moments having different directions and a load in the vehicle width direction are applied to the side sill 2, the side sill 2 is deformed substantially parallel to the vehicle width direction. The bending moment M2 is generated until the deformation of the vehicle body progresses and the load input point 5c becomes higher than the weak portion 4d of the cross member. (See Fig. 5)

Since the cross member 4 is allowed to rotate at the weak portion 4d, it is not affected by the bending moment M1.
Therefore, the force generated in the cross member member 4a is F2 transmitted from the side sill 2, and the bending moment M3 generated by the F2. This bending moment M3 is smaller than the bending moment M1. (See Fig. 6)

The general triangular shape composed of the cross member members 4a, 4b, 4c has a shape such that the center of the vehicle is 90 degrees or more of the base angle thereof. F2 acting on the cross member member 4a is
This is a force synthesized from the vehicle width direction component F2x and the vehicle lower direction component F2z. The bending moments generated by F2x and F2z are M3x and M3z, respectively. Since M3x and M3z are bending moments having different directions, the bending moment M3 generated in the cross member member 4a is reduced. (See Fig. 7)

The side sill 2 and the cross member member 4b are
As the member 4b is rotationally deformed counterclockwise by the bending moment M1, it is crushed from the tip of the member 4b. Due to this crushing deformation, the load input point transmitted to the cross member member 4a moves downward, and the bending moment M3 is reduced. (See Fig. 8)

As described above, the bending moment acting on the cross member can be reduced, and a high reaction force in the vehicle width direction can be generated.

(Second Embodiment) FIGS. 9 to 11 are views showing a second embodiment of the floor structure of a vehicle body according to the present invention. 9 is a perspective view showing the configuration of the second embodiment, FIG. 10 is a front view of the second embodiment, and FIG.
It is an exploded view of the embodiment.

Although the configuration is the same as that of the first embodiment,
The difference is that a reinforcing member 4e in which a bead is arranged in the vehicle front-rear direction is joined to the lower surface of the cross member weak portion 4d.

By disposing the beads, even if the vehicle body is deformed and the side sill 2 and the cross member member 4b are deformed substantially parallel to the vehicle width direction, they are bent in the vehicle vertical direction and do not hinder the deformation. Therefore, it has the same operation as the first embodiment.

(Third Embodiment) FIGS.
It is a figure showing a 3rd embodiment of a floor structure of a car body by the present invention. FIG. 12 is a perspective view showing the configuration of the third embodiment, FIG. 13 is a front view of the third embodiment, and FIG. 14 is an exploded view of the third embodiment.

Although the configuration is the same as that of the second embodiment,
The difference is that the cross member member 4b has a crushed bead 4f.
It is the point that is arranged. Therefore, it has the same operation as that of the second embodiment, and the load of the cross member member 4a can be smoothly transmitted by disposing the crushed bead 4f.

[0022]

As described in detail above, according to the present invention, the structure of the center pillar, which is formed in a closed cross section by the pillar inner and the pillar outer to form the vehicle body vertical frame member, and the side sill inner are provided. A side sill that is formed in a closed cross section with the side sill outer and extends below the center pillar in the front-rear direction of the vehicle, a floor that is joined near the upper end of the side sill, and a floor that is joined and fixed under the floor, and the end is fixed to the side sill In a vehicle body floor structure comprising a cross member provided in the vicinity of the cross member inside the side sill, and a brace installed in a direction separating the side sill in the vehicle front-rear direction, the vehicle upwardly protrudes near the side sill of the cross member. A fragile part with a generally triangular notch is provided, and the joint of the side sill brace to the side sill outer is Since the floor structure of the vehicle body is provided below the height, the bending moment acting on the cross member is reduced, and the effect that a high reaction force in the vehicle width direction can be generated can be obtained. .

Each embodiment has the following effects in addition to the above-mentioned common effects. In the second embodiment, since the reinforcing member is joined to the lower surface of the weak portion of the cross member, the proof stress is improved when a large bending moment acts on the cross member. In the third embodiment, since the crush bead is provided on the member on the side sill side bordering the fragile portion of the cross member, the effect of lowering the load input point due to the crush is improved.

[Brief description of the drawings]

FIG. 1 is a perspective view showing a configuration of a first embodiment of a floor structure of a vehicle body according to the present invention.

FIG. 2 is a front view of the first embodiment.

FIG. 3 is an exploded view of the first embodiment.

FIG. 4 is a diagram for explaining an effect of the first embodiment.

FIG. 5 is a diagram for explaining an effect of the first embodiment.

FIG. 6 is a diagram for explaining an effect of the first embodiment.

FIG. 7 is a diagram for explaining effects of the first embodiment.

FIG. 8 is a diagram for explaining effects of the first embodiment.

FIG. 9 is a perspective view illustrating a configuration of a second embodiment.

FIG. 10 is a front view of the second embodiment.

FIG. 11 is an exploded view of the second embodiment.

FIG. 12 is a perspective view illustrating a configuration of a third embodiment.

FIG. 13 is a front view of the third embodiment.

FIG. 14 is an exploded view of the third embodiment.

FIG. 15 (a) is a schematic diagram of a modification of the present invention, and FIG. 15 (b) is a schematic diagram of a conventional modification.

FIG. 16 is a vehicle body reaction force characteristic diagram.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Center pillar 2 Side sill 3 Floor 4 Cross member 4a, 4b, 4c Cross member member 4d Cross member weak part 4e Cross member reinforcing member 4f Collapse bead 5, 5a, 5b Brace 5c Joining point 6 Reinforcement member 10 Collision vehicle

Claims (3)

[Claims] 1. A center pillar which is formed in a closed cross section by a pillar inner and a pillar outer and forms a vehicle vertical frame member, and is formed in a closed cross section by a side sill inner and a side sill outer. A side sill extending in the direction, a floor joined near the upper end of the side sill, a cross member joined and fixed below the floor, and an end fixed to the side sill, near the cross member inside the side sill. A floor structure of a vehicle body, comprising: a brace disposed in a direction that divides the side sill in a vehicle front-rear direction. The cross member has a generally triangular notch protruding upward in the vehicle in the vicinity of the side sill. A joint between the side sill brace and the side sill outer is provided at the floor height. The floor of the vehicle body structure, characterized in that remote provided below. 2. The floor structure of a vehicle body according to claim 1, wherein the cross member has a cutout portion having a substantially triangular base angle on the center side of the vehicle of 90 degrees or more. Floor structure. 3. The vehicle body floor structure according to claim 1, wherein a reinforcing member having a bead disposed in a vehicle front-rear direction is provided on a lower surface of the notch of the cross member. Floor structure.