JPH11208523A - Floor structure of car body - Google Patents

Abstract

PROBLEM TO BE SOLVED: To efficiently and inexpensively manufacture a floor structural body of a car body having optimum strength and rigidity distribution. SOLUTION: It is constituted of a floor under reinforcement 12 formed of an extrusion molding material having a constant cross-sectional shape in the longitudinal direction and a floor panel 10 on which a drawn working part 18 extending in the vehicle longitudinal direction in correspondence with the floor under reinforcement, and the floor under reinforcement 12 is a floor structure arranged in conformity with the drawn part 18. The drawn part 18 has a cross-sectional shape larger than the vehicle rear side on the vehicle front side, the floor under reinforcement 12 has an equal leg trapezoidal formed U shaped cross-sectional shape which is actually opened upward, and it is fixed on a flay part 18A of the drawn part 18 by welding by its upper end flange parts 12A and 12B.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a vehicle body of a vehicle such as an automobile, and more particularly to a floor structure of a vehicle body.

[0002]

2. Description of the Related Art As one of floor structures of vehicles such as automobiles, for example, Japanese Patent Application Laid-Open No. 4-500 filed by the present applicant.
As described in Japanese Patent Publication No. 82, a front floor structure in which a closed cross section is formed by a convex cross section of a floor panel fixed to face each other and a concave cross section of a floor under reinforcement is conventionally known. ing. According to such a front floor structure, it is possible to relatively easily manufacture a front floor structure having a closed cross section whose shape changes in the vehicle front-rear direction.

[0003]

However, in the conventional front floor structure according to the above-mentioned proposal, the cross-sectional shape on the front side of the vehicle is made larger than that on the rear side of the vehicle so that the optimum strength and rigidity are distributed. In order to ensure that both the floor panel and the floor under reinforcement, each having a corresponding convex cross-section and a concave cross-section, must be formed into relatively complex shapes by pressing, It is difficult to efficiently and inexpensively manufacture a floor structure.

SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned problems in the conventional body floor structure which is a combination of press-formed products, and the main problem of the present invention is that it can be manufactured efficiently and at low cost. An object of the present invention is to manufacture a floor structure having an optimum strength and rigidity distribution efficiently and inexpensively by forming a floor under reinforcement with an extruded material.

[0005]

SUMMARY OF THE INVENTION The main object as described above is according to the present invention, which is formed of an extruded material having a substantially constant cross-sectional shape in the longitudinal direction. A floor under reinforcement, and a floor panel formed with a drawn portion extending in the vehicle front-rear direction corresponding to the floor under reinforcement, wherein the drawn portion is located on the front side of the vehicle from the rear side of the vehicle. The floor under reinforcement is fixed to the floor panel so as to be aligned with the drawing portion and is achieved by a floor structure of a vehicle body.

According to the structure of the first aspect, the floor under reinforcement, which is fixed to the floor panel in alignment with the drawing portion, is formed of an extruded material, and the drawing portion is located on the front side of the vehicle. Since it has a larger cross-sectional shape than the rear side, it becomes possible to manufacture an optimal floor structure having higher strength and rigidity at the front side of the vehicle than at the rear side of the vehicle with higher efficiency and lower cost than before.

[0007]

According to a preferred aspect of the present invention, in the configuration of the first aspect, the drawn portion of the floor panel and the floor under reinforcement extend at least in a vertical direction. (Preferred embodiment 1).

According to another preferred embodiment of the present invention, in the configuration of the first aspect, the drawn portion of the floor panel and the floor under reinforcement are configured to extend substantially linearly. (Preferred embodiment 2).

According to another preferred embodiment of the present invention, in the structure of the first aspect, the drawn portion of the floor panel has a substantially horizontal flat portion, and the floor under reinforcement is substantially formed. It has a U-shaped cross-sectional shape of an isosceles trapezoidal shape that is open upward and a flange portion that contacts the flat portion, and the flange portion is welded to the flat portion, so that the floor under reinforcement can draw the floor panel. It is configured to be fixed to a part (preferred mode 3).

According to another preferred embodiment of the present invention, in the configuration of the preferred embodiment 3, the drawn portion of the floor panel has a substantially U-shaped cross-sectional shape of an isosceles trapezoid opened upward. (Preferred embodiment 4).

[0011] According to another preferred embodiment of the present invention, in the configuration of the above-mentioned claim 1, the drawn portion of the floor panel and the floor under reinforcement are substantially in the shape of an equilateral trapezoid opened upward. It has a U-shaped cross-sectional shape, and the depth of the cross-sectional shape of the drawn part is larger at the front end side than at the rear end side, and the floor under reinforcement is on both sides with the drawing part partially received. The portion is configured to be fixed to both side portions of the drawn portion (preferred embodiment 5).

According to another preferred embodiment of the present invention, in the configuration of the above-mentioned preferred embodiment 5, the floor under reinforcement receives the drawing portion of the floor panel on the front end side from the rear end side. Is configured to extend obliquely with respect to the drawn portion so as to reduce (preferred mode 6).

According to another preferred embodiment of the present invention, in the above-mentioned preferred embodiment 6, the width of the drawn portion of the floor panel is gradually reduced from the front end to the rear end. (Preferred embodiment 7).

[0014]

BRIEF DESCRIPTION OF THE DRAWINGS The invention will now be described in more detail with reference to the accompanying drawings, in which several preferred embodiments are shown.

FIG. 1 is a side view showing a first embodiment of a vehicle body floor structure according to the present invention, and FIGS. 2 and 3 are enlarged sectional views taken along lines II-II and III-III in FIG. 1, respectively. .

In these figures, reference numeral 10 denotes a floor panel, and reference numeral 12 denotes a floor under reinforcement which is disposed below the floor panel 10 on both left and right sides of the vehicle and extends in the front-rear direction of the vehicle. The floor under reinforcement 12 is integrally connected and fixed to the rear end of the front side member 16 by welding at the front end welded portion 14.

In the first embodiment shown, the floor under reinforcement 12 extends slightly inclining upward as viewed from the front end toward the rear end, and relatively inclines in the middle. For example, a linear extruded material having a substantially constant cross-sectional shape in the longitudinal direction is formed by being curved vertically deformed by plastic working while maintaining a substantially constant cross-sectional shape. Is done. The floor panel 10 is formed by pressing a flat plate material so as to extend substantially corresponding to the curved shape of the floor under reinforcement 12.

As shown in FIG. 2, the floor panel 1
0 has a drawing portion 18 formed by, for example, press working and extending in the vehicle front-rear direction. The floor under reinforcement 12 is arranged in alignment with the drawing portion 18. In this embodiment, the drawing portion 18
Has a substantially U-shaped cross-sectional shape of an isosceles trapezoidal shape opened upward and has a substantially horizontal flat portion 18A,
The depth gradually decreases from the front end to the rear end,
It disappears near the relatively steeply inclined portion.

The floor under reinforcement 12 has a substantially U-shaped cross section in the shape of a trapezoid having a substantially trapezoidal shape opened upward, and the upper ends of both side portions 12A and 12B have flanges which contact the lower surface of the flat portion 18A. Parts 20A and 20B
Is provided. Further, the floor under reinforcement 12 is fixed to the drawn portion 18 by welding the flange portions 20A and 20B to the flat portion 18A of the drawn portion 18 as shown by the welded portion 22 indicated by X. I have.

Thus, according to the illustrated first embodiment,
The floor under reinforcement 12 is formed by bending a straight extruded material having a substantially constant cross-sectional shape in the longitudinal direction in a vertical direction while maintaining a substantially constant cross-sectional shape by plastic working. The floor structure can be manufactured more efficiently and at lower cost than in the case of the conventional structure in which both the floor under reinforcement and the floor panel are formed by pressing a flat plate.

According to the first embodiment shown in the drawings, the sectional shape of the floor under reinforcement 12 is substantially constant in the longitudinal direction, but the depth of the drawn portion 18 of the floor panel 10 is larger than that of the rear end. Since it gradually increases toward the front end, compared with the structure in which both the floor panel and the floor under reinforcement are provided with the drawing portions by press working and their cross-sectional shapes change in the longitudinal direction, An optimal floor structure having excellent strength and rigidity can be efficiently and inexpensively manufactured at the front end side.

In particular, according to the illustrated embodiment, the flange portions 20A and 2A of the floor under reinforcement 12 are provided.
0B is in surface contact with the flat portion 18A of the drawn portion 18 in a state before welding, so that the floor under reinforcement 12 can be easily and efficiently attached to the floor panel 10 by an efficient welding method such as spot welding. Can be fixed well.

If necessary in this embodiment, FIG.
As shown by an imaginary line in FIG. 3, a reinforcement 24 having a substantially U-shaped cross section in the shape of a trapezoid having a trapezoidal shape opened downward and having a flange portion at a lower end is formed in the drawing portion 18. It may be fixedly arranged on the floor panel 10.

In this case, the reinforcement 24 is preferably fixed to the floor panel 10 by spot welding together with the floor under reinforcement 12.
Also, the height of the reinforcement 24 is such that its flat part is substantially the same as the height of the main part of the floor panel.
It is preferable that the depth is gradually reduced from the front end toward the rear end in accordance with the depth of the drawn portion 18.

FIG. 4 is a side view showing a second embodiment of the vehicle body floor structure according to the present invention, and FIGS. 5 and 6 are enlarged sectional views taken along lines VV and VI-VI in FIG. 4, respectively. FIG. 7 is an exploded perspective view showing a main part of the second embodiment viewed obliquely from below. In these figures, the same members as those shown in FIGS. 1 to 3 are denoted by the same reference numerals as those shown in FIGS. 1 to 3.

In this embodiment, the floor under reinforcement 12 has a substantially U-shaped cross-sectional shape of an isosceles trapezoid opened substantially upward as in the first embodiment. It remains extruded and has a substantially constant cross-sectional shape in the longitudinal direction and extends linearly. The floor under reinforcement 12 is formed by the flange portions 20A and 20A in the first embodiment.
It does not have a flange portion corresponding to 0B.

On the other hand, the floor panel 10 also has a substantially flat shape in the same longitudinal direction of the vehicle as the floor under reinforcement 12, and is slightly upward from the rear end of the floor under reinforcement 12. Has been displaced. The drawing portion 18 also has a substantially U-shaped cross-sectional shape of an isosceles trapezoid shape opened upward, and linearly extends in the vehicle front-rear direction corresponding to the floor under reinforcement 12. The depth of the drawn portion 18 gradually decreases from the front end to the rear end, and the width gradually decreases slightly from the front end to the rear end.

As can be seen from FIGS. 5 and 6, the leg opening angles of the side portions 12A and 12B of the floor under reinforcement 12 are substantially the same as the leg opening angles of the side portions 18B and 18C of the drawing portion 18. Slightly smaller than this.
The floor under reinforcement 12 is inclined with respect to the drawing portion 18 so that the distance between the bottom wall portion 12C and the flat portion 18A of the drawing portion 18 gradually decreases from the front end toward the rear end. The drawing part 18 is partially received by the side parts 12A and 1A.
2B is formed by spot welding at the welded portion 22 or fillet welding at the upper edge portion of the side portion 18 of the drawn portion 18.
Fixed to B and 18C. Drawing part 1
A flat cover 26 is disposed on the upper surface 8 and is fixed to the floor panel 10 by welding such as spot welding at welding portions 28 on both edges thereof.

The floor under reinforcement 12 and the drawing portion 18 have the above-mentioned shapes, respectively. Since the floor under reinforcement 12 is inclined with respect to the drawing portion 18, the drawing portion 18 and the floor under reinforcement 12 are inclined. Is gradually reduced from the front end to the rear end, and the area difference of the cross-sectional shape between the front end and the rear end is between the front end and the rear end of the drawing portion 18. Is larger than the area difference between the cross-sectional shapes of the two.

Thus, according to the illustrated second embodiment,
Since the floor under reinforcement 12 is a linear extruded material having a substantially constant cross-sectional shape in the longitudinal direction, as in the first embodiment, both the floor under reinforcement and the floor panel are made of flat material. A floor structure can be manufactured more efficiently and at a lower cost than in the case of a conventional structure formed by press working, and there is no need to bend and deform a linear extruded material by plastic working. Therefore, the floor structure can be manufactured more efficiently and at lower cost than in the case of the first embodiment.

According to the second embodiment shown in the drawings, the floor under reinforcement 12 has a substantially constant cross-sectional shape in the longitudinal direction and is linear, but the floor under reinforcement 12 is closer to the front end side. Since it is inclined with respect to the drawing portion 18 so as to be located below, similarly to the case of the first embodiment, the drawing portions are provided on both the floor panel and the floor under reinforcement by press working, and their sectional shapes are provided. As compared with the case where the structure changes in the longitudinal direction, an optimal floor structure having excellent strength and rigidity can be efficiently and inexpensively manufactured toward the front end side. Even if the difference in the area of the cross-sectional shape between the front end and the rear end of the drawn portion 18 is smaller than that of FIG.

In particular, according to the illustrated second embodiment, the depth of the drawn portion 18 gradually decreases from the front end toward the rear end, and the width gradually decreases slightly from the front end to the rear end. Therefore, the drawing section 1 is positioned so that the floor under reinforcement 12 is positioned lower toward the front end.
8, the extruded material must be plastically deformed by press working or the like such that the distance between the upper edges of both side portions 12A and 12B of the floor under reinforcement 12 gradually increases from the front end toward the rear end. Therefore, the floor structure can be manufactured efficiently and at low cost.

Further, according to the second embodiment shown in the drawings, since the floor under reinforcement 12 does not need to be provided with a flange, the weight of the floor structure can be reduced as compared with the first embodiment. And the floor under reinforcement 12 with respect to the drawing section 18.
Are substantially straight from their front end to their rear end, which also allows the floor structure to be manufactured efficiently and inexpensively.

In the above, the present invention has been described in detail with respect to a specific embodiment. However, the present invention is not limited to the above embodiment, and various other embodiments are included in the scope of the present invention. It will be clear to those skilled in the art that is possible.

For example, in the first embodiment described above,
Floor under reinforcement 12 is drawn processing part 1
8 is fixed to the flat portion 18A,
May be set small, and the floor under reinforcement may be fixed to the floor panel 10 on both sides of the drawing portion.

In the above-described first embodiment, the floor under reinforcement 12 is curved in the vertical direction. However, the floor under reinforcement in the structure of the first embodiment is also the second embodiment. It may be configured to form a straight line as in the case of the embodiment.

Conversely, in the second embodiment described above, the floor under reinforcement 12 has a linear shape, but the floor under reinforcement in the structure of this embodiment is also the same as that of the first embodiment. It may be curved in the vertical direction as in the case, in which case the floor panel 1
The zero drawing portion 18 is also configured to have a curved shape corresponding to the shape of the floor under reinforcement.

In the above-described second embodiment, the depth of the drawn portion 18 gradually decreases from the front end toward the rear end, and the width gradually decreases gradually from the front end to the rear end. However, the width of the drawn portion 18 is set to be substantially constant over its entire length, and as the distance between the upper edges of both side portions 12A and 12B of the floor under reinforcement 12 increases from the front end toward the rear end. The extruded material may be plastically deformed so as to become gradually larger, so that the floor under reinforcement 12 may be inclined with respect to the drawn portion 18 so that the floor under reinforcement 12 is positioned lower toward the front end side.

Further, in the above two embodiments, the drawing section 18 and the floor under reinforcement 1
2 has a substantially U-shaped cross-sectional shape of a trapezoidal shape opened upward, but the cross-sectional shape may be any shape, for example, may be a substantially rectangular cross-sectional shape. .
In particular, in the second embodiment, when the cross-sectional shapes of the drawn portion 18 and the floor under reinforcement 12 are substantially rectangular, the width of the drawn portion 18 is substantially constant over its entire length. May be.

[0040]

As is apparent from the above description, according to the structure of the present invention, the floor under reinforcement that is fixed to the floor panel in alignment with the drawn portion of the floor panel is substantially constant in the longitudinal direction. Since the drawn portion has a larger cross-sectional shape at the front side of the vehicle than at the rear side of the vehicle,
An optimal floor structure having higher strength and rigidity at the front side of the vehicle than at the rear side of the vehicle can be manufactured more efficiently and inexpensively than in the past.

[Brief description of the drawings]

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

FIG. 2 is an enlarged sectional view taken along line II-II in FIG.

FIG. 3 is an enlarged sectional view taken along line III-III in FIG.

FIG. 4 is a side view showing a second embodiment of the floor structure of the vehicle body according to the present invention.

FIG. 5 is an enlarged sectional view taken along line VV of FIG. 4;

FIG. 6 is an enlarged sectional view taken along line VI-VI in FIG. 4;

FIG. 7 is an exploded perspective view showing a main part of the second embodiment as viewed obliquely from below.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 ... Floor panel 12 ... Floor under reinforcement 16 ... Front side member 18 ... Drawing part 20A, 20B ... Flange part 24 ... Reinforcement 26 ... Cover

Claims (1)

[Claims] 1. A floor under reinforcement formed of an extruded material having a substantially constant cross-sectional shape in a longitudinal direction, and a drawing portion extending in a vehicle front-rear direction corresponding to the floor under reinforcement. Formed on the floor panel, the drawn portion has a larger cross-sectional shape on the vehicle front side than on the vehicle rear side,
The floor structure of a vehicle body, wherein the floor under reinforcement is fixed to the floor panel in alignment with the drawing portion.