JPS6359912B2 - - Google Patents

Description

[Detailed description of the invention] [Industrial application field]

The present invention relates to a vehicle body floor structure, and more particularly to an improvement in a vehicle body floor structure in which a tunnel is formed in the widthwise center of a floor panel in the longitudinal direction of the vehicle, and a fuel tank is disposed within the tunnel.

[Prior art]

For example, as described in Japanese Patent Application Laid-Open No. 51-64234, in RR (rear engine/rear drive) type automobiles or FF (front engine/front drive) type automobiles, there is a By forming a convex tunnel in the longitudinal direction of the vehicle that is open at the bottom and arranging the fuel tank within the tunnel, it is possible to shorten the overall length of the vehicle and thereby reduce the vehicle weight. .

[Purpose of the invention]

The present invention provides an automobile having the structure as described above.
An object of the present invention is to provide a vehicle body floor structure for an automobile that improves floor rigidity and protects a fuel tank from obstacles when the vehicle runs onto a curb.

[Structure of the invention]

In this invention, in the widthwise central part of the floor panel,
A tunnel is formed in the longitudinal direction of the vehicle that is convex upward and open at the bottom, and a fuel tank is disposed within the tunnel, and a pair of left and right cross members connected to the floor panel are provided on both side walls of the tunnel. In the vehicle body floor structure of an automobile, the pair of left and right cross members are arranged on both left and right sides of the fuel tank, and are adjacent to lower ends of both side walls of the tunnel,
Further, a portion of the floor panel is protruded upward at a lower side near both inner ends of the cross member to form left and right step portions, and the inner ends of each of the pair of cross members are raised. The left and right steps and the cross are connected to the stepped portion, and both ends in the vehicle width direction are disposed in the lower recess of the stepped portion, and the bulkhead crosses the lower opening of the tunnel and the lower part of the fuel tank. The above object is achieved by integrally connecting the members near opposing inner ends. Further, in the present invention, the cross member has an upwardly convex cross-sectional shape, and the bulk head has a downwardly convex cross-sectional shape, so that there is a gap between the cross member and the floor panel and the stepped portion, and between the bulk head and the stepped portion. The above object is achieved by forming closed cross sections between the two parts.

【Example】

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a schematic cross-sectional view showing a main part of an automobile in which a car floor structure according to the present invention is implemented, and FIG. 2 is a partially sectional perspective view showing an enlarged view of the main part of the same embodiment. In this embodiment, a tunnel 2 in the longitudinal direction of the vehicle that is convex upward and open at the bottom is formed in the widthwise center of a floor panel 1 of an RR type automobile M, and a fuel tank 3 is disposed within the tunnel 2. Along with
The floor panel 1 is installed on both side walls of the tunnel 2.
A pair of left and right cross members 5A connected to the
In the automobile body floor structure formed by connecting both inner ends of the left and right cross members 5B,
A and 5B are arranged on both left and right sides of the fuel tank 3, adjacent to the lower ends of both side walls of the tunnel 2, and below the inner ends of the cross members 5A and 5B. Then, a part of the floor panel 1 is projected upward to form the left and right stepped portions 15.
A, 15B are formed, and the pair of cross members 5
A, 5B, the respective inner ends of the stepped portions 15A, 1
5B, and both ends in the vehicle width direction are arranged in the lower recess 16 of the stepped portions 15A and 15B,
In addition, the left and right step portions 15A, 15B and the cross member 5 are connected to the left and right step portions 15A, 15B by the bulkhead 6 which crosses the lower surface opening of the tunnel 2 and the lower part of the fuel tank 3.
The opposing inner ends of A and 5B are integrally connected. That is, a pair of left and right cross members 5 are arranged in alignment in a direction transverse to the upper surface of the floor panel 1.
A, 5B have stepped portions 15A, 15 on their lower surfaces.
It is integrally connected to the floor panel 1 including B, and is integrally connected to both side surfaces of the tunnel 2 at the left and right positions of the fuel tank 3 at the inner end. Also, the outer ends of the cross members 5A and 5B are connected to the second
As shown in the figure, it is integrally connected to the rocker inner panel 7. Further, the bulkhead 6 is connected to the step portions 15A, 15B, which are part of the floor panel 1, and the cross members 5A, 5B at both sides of the lower opening of the tunnel 2.
At the overlapping connection portion, both ends are connected by a bolt 8 and a nut 9 (see FIG. 3). Accordingly, the pair of left and right cross members 5A, 5B cross below the tunnel 2 and are connected in the vehicle width direction. The portions of the floor panel 1 to which the bulkheads 6 are attached, that is, the step portions 15A and 15B, are
As shown in the figure, the bulkhead 6 is projected upward by the thickness of the bulkhead 6, so that the lower surface of the bulkhead 6 installed in the recess 16 is substantially flush with the lower surface of the floor panel 1. There is. The cross members 5A and 5B are upwardly convex,
Further, the bulk head 6 has a downwardly convex cross-sectional shape, which allows the cross members 5A,
5B and the floor panel 1 and the stepped portions 15A, 15B, and between the bulkhead 6 and the stepped portions 15A, 15B.
15B, closed cross sections 17 and 18 are formed, respectively. As shown in FIGS. 3 and 4, the closed sections 17 and 18 are formed vertically overlapping each other at both ends of the bulkhead 6 via the step portions 15A and 15B. Further, as shown in FIG. 4, the pair of left and right cross members 5A, 5B are provided with passenger seats 10.
At the bottom of the seat 10, the mounting bracket 11
are attached by bolts 12, thereby preventing the interior space of the vehicle from being reduced by the cross members 5A and 5B. As shown in FIG. 1, the fuel tank 3 is fastened and fixed upward by tank bands 13 arranged at three locations in the longitudinal direction of the vehicle.
Therefore, the fuel tank 3 is tightened by the tank band 13 so as to press the buffer material 14 disposed between the top and side surfaces of the fuel tank 3 and the inner surface of the tunnel 2, thereby tightening the fuel tank 3. is stably supported. Here, the tank band 13 is installed at a position where it does not interfere with the bulkhead 6. According to the above embodiment, by connecting the inner ends of the pair of left and right cross members 5A, 5B with the bulkhead 6, the floor rigidity is greatly improved, and the bulkhead 6 prevents the vehicle from running onto a curb. The fuel tank 3 can be protected from obstacles at times. Also, cross members 5A, 5
Since B is placed on both sides of the fuel tank 3,
In particular, the floor rigidity around the fuel tank 3 can be improved. Here, in particular, since the floor panel 1 on both sides of the lower end of both side walls of the tunnel 2 protrudes upward to form stepped portions 15A, 15B, the section modulus of this portion is increased, and the stepped portions 15A,
By disposing the bulkhead 6 in the recess 16 on the lower side of the floor panel 15B, the lower surface of the bulkhead 6 is prevented from protruding below the lower surface of the floor panel 1.
The vehicle can be protected from obstacles, and the minimum ground clearance of the vehicle can be increased. Furthermore, in the embodiment, the cross member 5
A and 5B have a downwardly convex cross-sectional shape, and the bulkhead 6 has an upwardly convex cross-sectional shape, forming closed cross sections 17 and 18 between the floor panel 1 and the step portions 15A and 15B, respectively, and At both end positions of the bulkhead 6, the closed cross sections 17 and 18 are arranged so as to overlap vertically, so that the bulkhead 6
The joint rigidity between the floor and the cross members 5A and 5B can be greatly increased, and thereby the floor rigidity can be greatly improved. In addition, in the above embodiment, the cross member 5
A and 5B normally support the passenger seat 10 as shown in FIG. 4, but are not necessarily limited to this.

【Effect of the invention】

Since the present invention is configured as described above, even when the fuel tank is disposed in the tunnel formed in the center of the floor panel in the width direction, the bulkhead, which is a reinforcing member, does not need to protrude downward from the bottom surface of the floor panel. This has excellent effects in that the floor rigidity can be improved and the fuel tank can be protected.

[Brief explanation of drawings]

FIG. 1 is a schematic cross-sectional view showing the main parts of an automobile in which the car body floor structure according to the present invention is implemented, FIG. 2 is a partially sectional perspective view showing the main parts of the same embodiment, and FIG.
The figure is an enlarged sectional view taken along the - line in Fig. 2, and Fig. 4 is a view taken along the - line in Fig. 2. 1...floor panel, 2...tunnel, 3...
Fuel tank, 5A, 5B...Cross member, 6...
...Bulkhead, 15A, 15B...Step, 16
... Concavity, 17, 18 ... Closed cross section.

Claims (1)

[Scope of Claims] 1. A tunnel in the longitudinal direction of the vehicle that is convex upward and open at the bottom is formed in the center in the width direction of the floor panel, and a fuel tank is disposed within the tunnel, and a fuel tank is disposed within the tunnel. In an automobile body floor structure in which both inner ends of a pair of left and right cross members connected to the floor panel are connected to a wall, the pair of left and right cross members are arranged at positions on both left and right sides of the fuel tank. and a location adjacent to the lower ends of both side walls of the tunnel and below the vicinity of both inner ends of the cross member,
A portion of the floor panel projects upward to form left and right step portions, and the inner ends of each of the pair of cross members are connected to the step portions, and both ends in the vehicle width direction are located below the step portions. An automobile body in which the left and right step portions and the vicinity of opposing inner ends of the cross member are integrally connected by a bulkhead disposed in a side recess and crossing the lower opening of the tunnel and below the fuel tank. floor structure. 2. The cross member has an upwardly convex cross-sectional shape, and the bulkhead has a downwardly convex cross-sectional shape, so that there is a gap between the cross member and the floor panel and the step, and between the bulkhead and the step. 2. The vehicle body floor structure of claim 1, wherein a closed cross section is formed in each of the sections.