JP2566301B2 - Undercar body structure of automobile - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial field of application] The present invention is configured to connect the left and right edge portions of a floor panel between rocker panels extending in the front-rear direction of a vehicle body to form a floor portion of an automobile. BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a lower structure of a vehicle body, and particularly to a structure capable of improving the rigidity of a joint portion between a rocker panel and a floor panel.

[Conventional technology]

Generally, in the passenger compartment and luggage compartment of an automobile, rocker panels extending in the vehicle front-rear direction are connected to both outer lower end portions of a dash panel arranged in the front portion of the vehicle body, and the floor panel is left between the rocker panels. , The right edge is connected. Conventionally, as a lower structure of a vehicle body that constitutes the floor portion of such an automobile, there is one shown in FIG. This is a rocker panel 20 having a box-shaped closed cross section, which is composed of an outer panel 21 and an inner panel 22, disposed on both outer sides in the front-rear direction of the vehicle body. The right edge 23a is spot-welded. Reference numeral 24 is a door which is arranged above the rocker panel 20 so as to be openable and closable.

[Problems to be solved by the invention]

By the way, a vehicle body of an automobile is apt to be subjected to an external force such as twisting or bending during traveling, so that the lower portion of the vehicle body is required to have high rigidity. However, the above-mentioned conventional lower body structure is a structure in which both side edge portions of the floor panel are simply butted against a portion of the inner panel near the middle of the inner side surface thereof where lateral rigidity is not so high. Rigidity cannot be expected so much, and it is required to improve the rigidity of the connecting portion between the rocker panel and the floor panel. Here, in order to improve the rigidity of the connecting portion, it is conceivable to dispose a reinforcing member extending in the vehicle width direction on the upper surface and the lower surface of the floor panel, but this method increases the weight and the number of parts. There is a limit from inviting.

The present invention has been made in view of the above conventional circumstances, and an object of the present invention is to provide an underbody structure of an automobile capable of improving the rigidity of a connecting portion between a rocker panel and a floor panel without increasing weight or the number of parts. .

[Means for solving problems]

The present invention relates to a vehicle lower body structure in which a rocker panel is connected to left and right edge portions of a floor panel, and the left and right edge portions (joint portions) 14a, 14a of the floor panel 11 are connected to the inner panel 610, The inner panel 10 is joined to the inner side surface of the inner panel 10 and extends to the upper flange portion 10a of the inner panel 10, and the upper end portion of the extension portion 11a is connected to the upper flange portion 1 of the inner panel 10.
0a, the upper flange portion 10a of the inner panel 10
And a portion (recess) 12a between the left and right edge joints,
The floor panel 11 and the extension portion 11a form a passage space A having a closed cross section that extends in the front-rear direction of the vehicle body.

Here, in order to join the rocker panel and the floor panel of the structure of the present invention, first, the lower portion of the extension portion of the floor panel is spot-welded to the inner panel for sub-assembly, and the outer panel is brought into contact with the inner panel, The side flange portions are spot-welded together, and the upper flange portions of both panels and the upper end of the extension portion of the floor panel are overlapped and spot-welded.

[Action]

According to the vehicle body lower part structure of the invention, since both side edge portions of the floor panel are extended to the upper side flange portion along the inner side surface of the inner panel, the extension portion is doubled,
Moreover, the extension portion can be welded at two locations, and the extension portion and the inner panel form a passage space having a closed cross-section, so that the joint portion between the rocker panel and the floor panel can be formed without using a separate reinforcing member. The rigidity can be improved. In the present invention, the extension of the floor panel and the upper flange portion are spot welded, but in this case, the extension portion is overlapped with the upper flange portions of the inner panel and the outer panel,
Since these three pieces can be spot welded at the same time, the number of spot welds may be the same as the conventional number, and as a result, the rigidity can be improved without increasing the number of parts and the number of welding steps. Moreover, the number of parts can be reduced as compared with the case where a reinforcing member is added.

〔Example〕

 Embodiments of the present invention will be described below with reference to the drawings.

1 to 3 are views for explaining a vehicle lower body structure according to an embodiment of the present invention.

In the figure, 1 is an automobile to which the vehicle body lower structure of the present embodiment is applied, which connects the edges of a roof panel 2 and roof side rails 3 arranged on the left and right outer sides of the roof panel 2, The upper ends of the front pillar 4 and the center pillar 5 are connected to the lower surface of the roof side rail 3, and the rocker panel 6 extending in the vehicle front-rear direction is connected to the lower ends of the pillars 4 and 5 to form a door opening 7. , The opening 7
A door 8 which can be opened and closed is arranged in the interior.

The rocker panel 6 has an outer panel 9 and an inner panel 10. The rocker panel 6 has a closed cross-section. The upper and lower edges of the outer panel 9 have upper and lower flange portions 9a and 9b, respectively. The upper and lower flanges are also on the lower edge.
10a and 10b are integrally formed, and each upper flange 9
The a, 10a and the lower flange portions 9b, 10b are joined together. Further, an outer curved concave portion 12a is formed in the upper portion of the inner panel 10, and a lower edge portion of the concave portion 12a is a flat joint portion 12b.

A front floor panel 11 is provided between the left and right rocker panels 6, 6. This floor panel 11
At the left and right edges of the inner panel 10, an extension portion 11a extending to the upper flange portion 10a is formed along the upper half portion of the inner panel 10, and the extension portion 11a is a joint portion 12b of the inner panel 10.
A flat joint portion 14a abutting against the concave portion 14b, a concave portion 14b which is curved inward following the joint portion 14a and forms a passage space portion A with the concave portion 12a, and which extends subsequent to the concave portion 14b. And a flange portion 14c that abuts the upper flange portion 10a. Then, the joint portion of the inner panel 10
12b and floor panel joint 14a, and outer panel 9 and inner panel 10 upper flanges 9a, 10a and floor panel 10
The flange portions 14c are joined to each other by spot welding, which constitutes the vehicle body lower part structure of the present embodiment.

 Next, the function and effect of this embodiment will be described.

According to this embodiment, the extension portion 11a including the joint portion 14a and the flange portion 14c is integrally formed on the side edge portion of the front floor panel 11, and the joint portion 14a is joined to the joint portion 1 of the inner panel 10.
Since the flange portion 14c is welded to the upper flange portions 9a and 10a of the rocker panel 6 while being welded to the 2b, the rigidity is improved as compared with the structure in which the floor panel is simply butted against the inner surface of the conventional inner panel. It is possible to reduce vibration and noise.

Further, in the structure of this embodiment, the recess 12a of the inner panel 10 is
And the recess 14b of the floor panel 11 form a passage space A having a closed cross section.
Since it is formed, the rigidity of this portion can be further improved, and the harness 15 can be wired in the space A, and the appearance is better than that in the case of wiring on the conventional floor panel, that is, in the room.

Further, in assembling the structure of the present embodiment, the flange portion 14c of the floor panel 11 may be superposed on the upper flange portions 9a, 10a of the rocker panel 6, and the three may be spot-welded and joined at the same time. The number of spots of this spot welding may be the same as the conventional number, and can be realized by only slightly extending the side edge portion of the floor panel 11, and there is almost no increase in cost.

Further, in the conventional structure, the body sealer for preventing the intrusion of rainwater or the like is applied to the connecting portion (the portion B in FIG. 4) between the rocker panel and the floor panel, but in the structure of this embodiment, the side edge of the floor panel 11 is applied. Since the part extends to the upper side flange part, invasion of rainwater and the like can be avoided and the body sealer can be eliminated.

[Advantages of the Invention] As described above, according to the substructure of the vehicle of the present invention, the left and right edges of the floor panel are joined to the inner side surface of the inner panel and extended to the upper flange portion of the inner panel. Since the extension portion is joined to the upper flange portion to form the passage space having the closed cross section, there is an effect that the rigidity can be improved without the need for a reinforcing member and the number of welding points is increased. The harness can be wired, and the harness can be protected and the appearance can be improved.

[Brief description of drawings]

1 to 3 are views for explaining a vehicle body lower part structure according to an embodiment of the present invention, and FIG.
Fig. 2 is a sectional view taken along the line I-I in Fig. 2, Fig. 2 is a perspective view thereof, Fig. 3 is a side view showing an automobile adopting the structure of this embodiment, and Fig. 4 is a sectional view for explaining a conventional underbody structure. It is a figure. In the figure, 1 is an automobile, 6 is a rocker panel, 9 is an outer panel, 9a is an upper flange portion, 10 is an inner panel, 10
a is an upper flange portion, 11 is a floor panel, and 11a is an extension portion.

Claims (1)

(57) [Claims] 1. A vehicle underbody structure in which a floor panel is disposed between a left and right rocker panel, which is formed by joining an outer panel and an inner panel at upper and lower flange portions, and the left side of the floor panel, The right side edge portion is joined to the inner side surface of the inner panel and is extended to the upper flange portion of the inner panel, the extension portion is joined to the upper flange portion of the inner panel, and the upper flange portion of the inner panel and the left side, A vehicle lower body structure for an automobile, characterized in that a passage space having a closed cross section extending in the vehicle front-rear direction is formed by a portion between the right side edge joint portion and the extension portion of the floor panel.