JP3498565B2 - Body floor structure - Google Patents

Description

Description: BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a vehicle body of a vehicle such as an automobile, and more particularly to a floor structure of the vehicle body. 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 has been proposed.
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, a front floor structure having a closed cross section whose shape changes in the vehicle front-rear direction can be relatively easily manufactured. [0003] However, in the conventional front floor structure according to the above-mentioned proposal, the cross-sectional shape of the front side of the vehicle is made larger than that of the rear side of the vehicle to obtain the optimum strength and strength. In order to secure the distribution of the rigidity, both the floor panel and the floor under reinforcement, each having a corresponding convex section and concave section, must be formed into a relatively complicated shape by press working. Therefore, it is difficult to efficiently manufacture the front floor structure at low cost. 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 efficiently and inexpensively manufacture a floor structure having an optimum strength and rigidity distribution by forming a floor under reinforcement with an extruded material. According to the present invention, the main object as described above is to provide a structure according to claim 1, namely, a floor under reinforcement, and a vehicle front and rear corresponding to the floor under reinforcement. the floor of the vehicle body drawing portion extending in direction ing more a floor panel formed
In the structure, the drawn portion has a U-shaped cross-section that is larger at the front side of the vehicle than at the rear side of the vehicle and is open upward, and the floor under reinforcement is long.
U-shaped cross section that is substantially constant upward in the hand direction
Formed by an extruded material having a shape,
The floor structure of the vehicle body is characterized in that the lower part is aligned with the drawn part and fixed to the drawn part . [0006] According to this configuration 1, greater than the vehicle rearward aperture Ri processing unit at the vehicle front side upward
Have a U-shaped cross-sectional shape opened, under floor Rii
Enforcement is substantially constant upward in the longitudinal direction
Shaped with extruded material having an open U-shaped cross section
Is drawn, and aligned with the drawn part below the drawn part.
Ri is fixed to the machining unit Runode, strength and rigidity of the vehicle front side it is possible to produce efficiently inexpensively than conventional high optimum floor structure than the vehicle rear side. 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 are at least vertically curved. (Preferred mode 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 configuration 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 opened 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 the part (preferred mode 3). According to another preferred embodiment of the present invention, in the above structure, the drawing portion of the floor panel and the floor under reinforcement are substantially equidistantly opened upward. It has a trapezoidal U-shaped cross-sectional shape, the depth of the cross-sectional shape of the drawn portion is larger at the front end side than at the rear end side, and the floor under reinforcement is in a state where the drawn portion is partially received. It is configured to be fixed to both sides of the drawn portion at both sides (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 configuration of 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). 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 of 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 illustrated first embodiment, the floor under reinforcement 12 extends slightly inclining upward when 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 bent vertically by a 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
Numeral 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 that is open upward, and the upper ends of both side parts 12A and 12B have flanges that contact the lower surface of the flat part 18A. Parts 20A and 20B
Is provided. The floor under reinforcement 12 is fixed to the drawing portion 18 by welding the flange portions 20A and 20B to the flat portion 18A of the drawing 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 linear 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. Further, according to the first embodiment shown in the drawings, the cross-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 to the case where the drawing section is provided on both the floor panel and the floor under reinforcement by press working, and their cross-sectional shape changes in the longitudinal direction, An optimum 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 20A 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 of a trapezoidal 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 a 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 as 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 section in the 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 rearward 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 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 toward the rear end, and the width thereof 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, and the side parts 12A and 1
2B is formed by, for example, spot welding at the welded portion 22 or fillet welding at the upper edge portion.
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 section 18 have the above-mentioned shapes, respectively. Since the floor under reinforcement 12 is inclined with respect to the drawing section 18, the drawing section 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 the conventional structure formed by pressing, 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 illustrated second embodiment, 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, drawing portions are provided on both the floor panel and the floor under reinforcement by press working, and their cross-sectional shapes are formed. As compared with the case where the structure changes in the longitudinal direction, it is possible to efficiently and inexpensively manufacture an optimum floor structure having excellent strength and rigidity toward the front end side, and in the case of the first embodiment. Even if the difference in the cross-sectional area between the front end and the rear end of the drawn portion 18 is smaller than that of the drawing portion, the optimum strength and rigidity distribution can be achieved. In particular, according to the second embodiment shown in the drawings, 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. 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 portion, the weight of the floor structure is 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 makes it possible to manufacture floor structures efficiently and inexpensively. Although the present invention has been described in detail with reference to specific embodiments, the present invention is not limited to the above-described embodiments, and various other embodiments may be included within 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, the floor under reinforcement 12 is curved in the vertical direction, but the floor under reinforcement in the structure of the first embodiment is also As in the case of the second embodiment, it may be configured to be linear. 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 from the front end to the rear end. However, the width of the drawn portion 18 is set to be substantially constant over the entire length thereof, and the distance between the upper edges of both side portions 12A and 12B of the floor under reinforcement 12 is increased 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. 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 that is opened upward, but the cross-sectional shape may be any shape, for example, 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 the entire length. May be. [0040] As is clear from description above, according to the present invention, according to the configuration of the present invention, diaphragm Ri processing unit co opened at the vehicle front side upward greater than the vehicle rear side of the shaped have a cross-sectional shape, the under floor reinforcement in the longitudinal direction
U-shaped cross-section that is substantially constant upward
Formed of extruded material with
At is fixed to the machining unit aperture in alignment with the drawn portion Runode, strength and rigidity of the vehicle front side is manufactured efficiently inexpensively than conventional high optimum floor structure than the vehicle rear side be able to.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a side view showing a first embodiment of a vehicle body floor structure 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 in 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. [Description of Signs] 10 ... Floor panel 12 ... Floor under reinforcement 16 ... Front side member 18 ... Drawing parts 20A and 20B ... Flange part 24 ... Reinforcement 26 ... Cover

Claims (1)

(57) Patent Claims 1. A under floor reinforcement, the under floor reinforcement body ing more and floor panels drawn portion is formed extending in the vehicle longitudinal direction corresponding to In the floor structure of the above, the drawing portion is upwardly larger at the front side of the vehicle than at the rear side of the vehicle.
Has an open U-shaped cross-section, wherein the floor under reinforcement is substantially constant upward in the longitudinal direction
Extruded material with a U-shaped cross section that opens to
A floor structure of a vehicle body formed and fixed to the drawing portion in alignment with the drawing portion below the drawing portion .