JP3018664B2 - Lower body structure of car - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a lower body structure of an automobile.

[0002]

2. Description of the Related Art Conventionally, a vehicle body floor of an automobile is constructed by joining an upper floor panel and a rear floor panel to each other. A bead portion extending in the vehicle front-rear direction is provided on the upper surfaces of the upper floor panel and the rear floor panel for reinforcement.

[0003]

However, in the above-described conventional lower vehicle body structure, a floor member matching the bead portion of the rear floor panel is not provided, and the bead portion has a closed cross-sectional structure. Therefore, the rigidity of the vehicle body floor and the joint cannot be improved, which is disadvantageous in terms of vibration and noise of the automobile. In addition, since the rigidity of the upper floor panel is insufficient, the dimensional accuracy at the time of assembling cannot be increased, and there is a problem in assemblability.

[0004] The present invention has been made in view of such circumstances, and an object of the present invention is to improve the rigidity of a vehicle body floor and a connecting portion, and to improve the dimensional accuracy at the time of assembly. An object of the present invention is to provide a lower vehicle body structure.

[0005]

According to the present invention, a bead portion extending in the front-rear direction of a vehicle body is provided on upper surfaces of an upper floor panel and a rear floor panel constituting a vehicle body floor. ,
A floor member extending in the vehicle longitudinal direction is joined to a lower surface of the upper floor panel, and a projection having a shape corresponding to a bead portion of the upper floor panel and a rear floor panel is provided at a rear end of the floor member. The bead portions of the upper floor panel and the rear floor panel are overlapped and joined to each other with the protrusions of the members interposed therebetween.

[0006]

In the lower body structure of an automobile according to the present invention, the projections of the floor members extending from the lower surface of the upper floor panel are overlapped with and joined to the beads of the upper floor panel and the rear floor panel. The bead portion of the rear floor panel is joined and joined to the upper floor panel with the same cross-sectional shape.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, the present invention will be described in detail with reference to the illustrated embodiments.

FIG. 1 to FIG. 9 show an embodiment of a lower body structure of an automobile according to the present invention. In the figure, reference numeral 1 denotes a cab-over type vehicle, and 2 denotes a vehicle body floor provided in the cabin of the vehicle 1. The vehicle body floor 2 is disposed between side sills 3 provided at lower portions on both sides of the vehicle body.

The vehicle body floor 2 is formed by joining an upper floor panel 4, a rear floor panel 5, and a floor member 6 to each other by spot welding or the like. The kick-up section 7 provides the vehicle body floor 2
The rear side of is higher.

For this reason, the upper floor panel 4 is formed in an inverted L-shape by an upper surface portion 4a and a side surface portion 4b, and a joining flange 4c formed by bending this outward is provided at a lower end portion. Is provided. The rear floor panel 5 located at the kick-up portion 7 is bent obliquely upward toward the rear of the vehicle body, and is constituted by a lower step surface 5a, an inclined surface 5b, and an upper step surface 5c. In this state, a substantially rectangular closed space is formed. Further, the upper surface portion 4a of the upper floor panel 4 and the upper surfaces 5a, 5b, 5 of the rear floor panel 5
A plurality of bead portions 8 and 9 extending in the vehicle front-rear direction are provided at corresponding positions in c. These bead portions 8 and 9 are formed by embossing to reinforce the upper floor panel 4 and the rear floor panel 5 themselves, and are formed in substantially the same U-shaped cross section with the opening edges arranged downward. The floor panel 4 and the rear floor panel 5 are arranged at intervals in the vehicle width direction so as to be on a straight line in a joined state.

A floor member 6 extending in the vehicle longitudinal direction is joined to the lower surface of the upper floor panel 4 by spot welding or the like. For this reason, the floor member 6 is formed in an L-shape which is arranged in the opposite manner to the upper floor panel 4, and a lower end portion is provided with a joining flange 6 a which is bent outward. The intermediate portion 6b of the floor member 6 has a substantially U-shaped cross section in which an opening edge is arranged upward, and its upper surface is a joint surface with the upper floor panel 4.

Also, at the rear end 6c of the floor member 6,
A projection 10 having a shape corresponding to the beads 8 and 9 of the upper floor panel 4 and the rear floor panel 5 is provided. That is, the projecting portion 10 is formed in a substantially U-shaped cross section in which the opening edge is arranged downward, extends along the front-rear direction of the vehicle body, 9 and is integrally formed in a size that can be arranged between them.

In the lower vehicle body structure of this embodiment, the upper surface of the floor member 6 is superimposed on the lower surface of the upper floor panel 4 where the bead portion 8 is provided, and the joining flange 6a of the floor member 6 and the intermediate portion 6b and rear end 6
and the corresponding joining flange 4c, side surface 4b and upper surface 4a of the upper floor panel 4 are joined to each other by spot welding or the like. Next, kick-up part 7
The upper floor panel 4 and the floor member 6 are placed on the upper surface of the rear floor panel 5 located at the position shown in FIG.
0 is overlapped on a bead portion 9 located on the upper step surface 5c of the rear floor panel 5 and joined to each other by spot welding or the like, and the joining flanges 4c and 6a of the upper floor panel 4 and the floor member 6 are connected to the lower step surface 5 And spot welding. The upper floor panel 4 and the floor member 6 are joined in a closed sectional structure as shown in FIGS. 3 and 7, and the upper surface 4a of the upper floor panel 4, the rear end 6c of the floor member 6 and the rear floor. As shown in FIG. 8, the upper step surface 5 c of the panel 5 connects the protrusion 10 of the floor member 6 to the two floor panels 4.
5 are joined with the same cross-sectional shape while being arranged between the bead portions 8 and 9.

According to the lower vehicle body structure of the present embodiment, the floor member 6 is joined to the upper floor panel 4 to form a closed sectional structure, and the bead portion 8 of the upper floor panel 4 and the projection 10 of the floor member 6 are formed. Since the bead portion 9 of the rear floor panel 5 is overlapped and joined, the bead portion 9 of the rear floor panel 5 is joined to the bead portion 8 of the upper floor panel 4 in a straight line and joined. The reinforcing effect can be enhanced, and the rigidity of the upper floor panel 4 and the rear floor panel 5 itself and the rigidity of the joint between the floor panels 4 and 5 can be improved.

As described above, one embodiment of the present invention has been described.
The present invention is not limited to the embodiments described above, and various modifications and changes can be made based on the technical idea of the present invention.

For example, in the above-described embodiment, the bead portions 8 and 9 of the floor panels 4 and 5 and the floor member 6 are provided.
Although the projection 10 has a substantially U-shaped cross section, it may be formed in a semicircular cross section or any other shape depending on the type of vehicle to be applied.

[0017]

As described above, the lower vehicle body structure of the vehicle according to the present invention is provided with a bead portion extending in the vehicle longitudinal direction on the upper surface of the upper floor panel and the rear floor panel, and on the lower surface of the upper floor panel in the vehicle longitudinal direction. Are joined together, a projection is provided at the rear end of the floor member, and the bead portions of the two floor panels are overlapped and joined to each other with the projection of the floor member interposed therebetween. Therefore, the rigidity of the upper floor panel and the rear floor panel itself can be increased, which is advantageous against the load applied to the vehicle body floor.In addition, the rigidity of the joint between the two floor panels can be improved, thereby reducing the vibration and noise of the automobile. Can be suppressed.

Further, in the lower vehicle body structure of the present invention, since the floor member is provided on the lower surface of the upper floor panel,
The rigidity of the upper floor panel is improved, the dimensional accuracy when assembling the vehicle body floor can be increased, and the assemblability can be improved.

[Brief description of the drawings]

FIG. 1 is a perspective view showing an automobile to which a lower vehicle body structure according to an embodiment of the present invention is applied.

FIG. 2 is an enlarged perspective view showing a portion A in FIG. 1;

FIG. 3 is a sectional view taken along line BB in FIG. 2;

FIG. 4 is a sectional view taken along line CC in FIG. 2;

FIG. 5 is a sectional view taken along line DD in FIG. 2;

FIG. 6 is a perspective view showing a floor member joined to the upper floor panel and the rear floor panel.

FIG. 7 is a sectional view taken along line EE in FIG. 6;

FIG. 8 is a sectional view taken along line FF in FIG. 6;

FIG. 9 is a perspective view showing a state in which the upper floor panel and the floor member are joined to the rear floor panel.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Automobile 2 Body floor 4 Upper floor panel 5 Rear floor panel 6 Floor member 8, 9 Bead part 10 Projection part

Claims (1)

(57) [Claims] A bead portion extending in the vehicle longitudinal direction is provided on upper surfaces of an upper floor panel and a rear floor panel constituting a vehicle body floor, and a floor member extending in the vehicle longitudinal direction is joined to a lower surface of the upper floor panel. A protrusion having a shape corresponding to a bead portion of the upper floor panel and the rear floor panel is provided at a rear end of the floor member, and the bead portions of the upper floor panel and the rear floor panel are arranged with the protrusion of the floor member interposed therebetween. A lower body structure of an automobile, wherein the lower body is overlapped and joined to each other.