JPH03246171A - Front car body structure of automobile - Google Patents

Abstract

PURPOSE:To reduce the height of a hood and to improve the strength and rigidity by filling extending over the interior of a cross member and the room portion in a closed sectional structure portion formed by a side member and a closing plate with foaming urethane to reduce the sectional area in the closed sectional area portion. CONSTITUTION:A hole 8 for communicating the interior of a cross member 5 with a closed sectional structure portion is formed on the side wall of a front side member 4 forming a room chamber portion 7, and the room portion 7 and the interior of a cross member 5 are filled with foaming polyurethane 9 as foaming material. As the foaming urethane 9 is continuously charged in the interior of the member 5 and the room portion 7 in the closed sectional structure portion 3 formed by the member 4 and the plate 2, the connecting rigidity of the cross member 5 and the side member 4 is improved so as to oppose moment M, and torsional rigidity is improved. The sectional height of the cross member 5 can be reduced for an improvement in strength rigidity by filling of foaming urethane 9 so as to reduce the height of a hood.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of Industrial Application This invention relates to a front body structure of an automobile.

An example of a conventional vehicle front body structure is shown in FIG. 8.

That is, in the same figure, ▪ indicates a radiator core support, and front side members 4 forming a closed cross-section structure 3 with the closing plate 2 are arranged at the lower sides of both sides of the radiator core support l.

Between the front side members 4, a cross member 5 having a closed cross section structure is provided on the inner and lower surfaces of the front side members 4 and on the inner surface of the closing plate 2.
They are joined by runno portions (this similar structure is shown in, for example, Japanese Patent Laid-Open No. 54-53417).

Problems to be Solved by the Invention However, in the above-mentioned conventional vehicle body structure, in order to resist human power from the towing hook and tension rod attached to the outside of the vehicle interior of the closing plate 2,
It is necessary to increase the plate thickness of each member, increase the cross-sectional area of the closed cross-section structure part, and add reinforcing materials, which leads to an increase in vehicle weight. There is a problem that the quality becomes high.

SUMMARY OF THE INVENTION Accordingly, the present invention provides a front body structure for an automobile, in which the cross-sectional area of the closed cross-section structure portion is reduced, thereby making it possible to reduce the hood and improve strength and rigidity.

Means for Solving the Problem A cross member having a closed cross-section structure formed in the vehicle width direction is joined to the inner surface of a side member to which a closing plate is joined to form a closed cross-section structure in the longitudinal direction of the vehicle body. A chamber is provided with a partition material at a position within the structure corresponding to the part where the cross member is attached,
The chamber and the inside of the cross member communicate with each other through a hole formed in the side member, and the chamber and the cross member are filled with a foamable resin material.

The inside of the cross member and the chamber are integrated with the filled foam material to ensure joint strength with the closed section structure formed by the cross member and side members, and the hood height can be reduced by downsizing the cross member. Try to reduce the amount.

Embodiment Hereinafter, an embodiment of the present invention will be described with reference to the drawings, with the same reference numerals given to the same parts as the conventional structure.

In FIGS. 1 to 7, front side members 4, which are side members that form a closed cross-section structure 3 with the closing plate 2, are located at the bottom of both sides of the radiator core support l.
and both front side members 4
The basic structure, such as the fact that a cross member 5 having a closed cross section structure is joined between them, is the same as that of the prior art.

Here, the cross member 5 is bent upward near both surveying parts, and the lower wall 5a of this cross member 5 is joined to the lower wall of the front side member 4, and the front wall 5b is connected to the lower wall of the front side member 4. The upper wall 5c is joined to the side wall of the front side member 4.

A chamber portion 7 is provided by a partition member 6 at a position within the closed cross-section structure portion 3 formed by the front side member 4 and the closing plate 2 and corresponding to a portion where the cross member 5 is attached.

The partition member 6 includes a vertical wall 6A joined to the lower wall and side wall of the front side member 4 and the closing plate 2 by a flange portion 6a, the side wall of the front side member 4, the front wall 5b of the cross member 5, and the closing plate. 2 and an earthen wall 6B joined by a flange portion 6b.

Therefore, the partition member 6, the closing plate 2, and the front side member 4 form a sealed chamber 7.

The front side member 4 forming this chamber 7
A hole 8 is formed in the side wall of the cross member 5 to communicate the inside of the cross member 5 with the closed section structure 3 formed by the front side member 4 and the closing plate 2. Foamed urethane as a resin material 9
is filled.

Note that 10 indicates a hook attached to the closing plate 2, and 11 indicates a reinforcement.

According to the structure of the above embodiment, the foamed urethane 9 is continuously filled in the cross member 5 and the chamber 7 in the closed section structure 3 formed by the front side member 4 and the closing plate 2. Therefore, the joint rigidity between the cross member 5 and the side members 4 is improved, the moment M shown in FIG. 1 can be resisted, and the torsional rigidity is improved.

Furthermore, the cross member 5 does not buckle even with the tie-down human force Fl (input acting on the hook IO) shown in FIG. 5, and can sufficiently resist the tension rod input F2 shown in FIG. can.

Since the foamed urethane 9 is filled to improve strength and rigidity, the cross-sectional height of the cross member 5 can be reduced by, for example, A, as shown in FIG. 7, and the hood height is reduced by this height A. It is possible to reduce the

Furthermore, the chamber 7 at the lower front end of the closed section structure 3 formed by the front side member 4 and the closing plate 2 can suppress buckling deformation in the event of a frontal collision of the vehicle.

In addition, it is possible to contribute to reducing the weight of the vehicle body compared to cases where a reinforcing material is used separately or the thickness of the plate is increased.

As described in detail, according to the present invention, urethane foam is filled throughout the cross member and the chamber within the closed section structure formed by the side members and the closing plate. This has the effect of increasing the bonding strength between the member and the closed cross-section structure, thereby improving the strength and rigidity of the front portion of the vehicle body.

Further, since it is possible to reduce the cross-sectional height of the cross member whose rigidity is improved by filling the urethane foam, there is an effect that the hood height can be reduced accordingly.

Moreover, there is an effect that the weight of the vehicle body can be reduced compared to the case where a reinforcing material is used separately or the plate thickness is increased.

[Brief explanation of drawings]

1 to 7 show one embodiment of the present invention, in which FIG. 1 is a perspective view of the main part, FIG. 2 is a sectional view taken along the line ■-■ in FIG. 1, and FIG.
The figures are a cross-sectional view taken along line I[[-I of FIG. 1, FIG. 4 is a perspective view of the front of the vehicle, FIG.
FIG. 7 is a side sectional view, and FIG. 8 is a partial perspective view of the prior art. 2... Closing plate, 3... Closed section structure part, 4... Front side member (side member), 5
... Cross member, 6... Partition material, 7... Chamber part,
9...Urethane foam (foamable resin material). Fig. Closing plate interval [fIai1 part front seat member ('fit' member) Figure diagram

Claims (1)

[Claims] (1) A cross member with a closed cross-section structure formed in the vehicle width direction is joined to the inner surface of the side member to which the closing plate is joined and forms a closed cross-section structure in the longitudinal direction of the vehicle body, and a cross member with a closed cross-section structure formed in the vehicle width direction is joined to A chamber is provided by a partition material at a position corresponding to the area where the cross member is attached, and this chamber and the inside of the cross member communicate with each other through a hole formed in the side member. An automobile front body structure characterized by being filled with a resin material.