JPH10203422A - Front side member rear structure - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a front side member rear structure whereby load can be efficiently dispersed relating to an input from a front side member front in the beginning of collision and an input from a through hole part of a front side member rear after progress of deformation. SOLUTION: A front side member rear structure is constituted so as to comprise a front side member 1 set up with a through hole in the rear, extension member 3, dash lower cross member 2, dash lower, and a compression rod mounting reinforce 4. Here, a front of the extension member 3 is, in the inside of the front side member 1, extended in the vicinity of the through hole, the extension member 3 is connected to the dash lower and the compression rod mounting reinforce 4, it is connected the dash lower cross member 2.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a rear structure of a front side member.

[0002]

2. Description of the Related Art As a conventional rear structure of a front side member, for example, there is a technique described in Japanese Utility Model Laid-Open No. 2-136770 shown in FIGS. 10 (a), 10 (b), 10 (c) and 10 (d).
In the figures, 1 is a floor van, 4 is a dash panel, 4b is a horizontal wall, 10 is a dash cross member, 14 is a side reinforcement, and 17 is a front side member.

[0003]

However, in such a conventional front side member rear structure, the extension member is joined to the lower surface of the front side member rear part, so that the front side member distal end is not provided. There is a problem in that the thickness of the plate must be increased in order to withstand the moment, and the weight increases. The present invention has been made in view of such a conventional problem, by extending the front portion of the extension member to near the through hole at the rear of the front side member, and joining the extension member to the dash lower, It is intended to solve the above problems.

[0004]

According to a first aspect of the present invention, there is provided a rear structure of a front side member having a through hole in a rear portion, an extension member, and a dash. In a rear structure of a front side member including a lower cross member, a dash lower, and a compression rod mounting reinforcement, a front portion of the extension member is extended to a vicinity of a through hole inside the front side member, and the extension member includes a dash lower and a compression rod. It was joined to the mounting reinforce, and the compression rod mounting reinforce was joined to the dash lower cross member. In the rear structure of the front side member according to the second aspect, a front side member having a through hole at a rear portion, an extension member, an extension member front, a dash lower cross member, a dash lower, and a compression rod mounting reinforcement. In the rear structure of the front side member, the extension member and the extension member front are joined to the dash lower, and the front of the extension member front is extended to near the through hole inside the front side member,
The extension member front is joined to a compression rod mounting reinforcement, and the compression rod mounting reinforcement is joined to a dash lower cross member. In the rear structure of the front side member according to the third aspect, a front side member having a through hole at a rear portion, an extension member, an extension member front, a dash lower cross member, a dash lower, and a compression rod mounting reinforcement. In the rear structure consisting of a front side member consisting of: And the front of the extension member front is near the through hole inside the front side member. It has a configuration which is long.

[0005]

Hereinafter, the present invention will be described with reference to the drawings. FIGS. 1, 2, and 3 are diagrams showing Embodiment 1 of the present invention. First, the configuration will be described. A through hole 1a is provided at a rear portion of the front side member 1,
The front portion of the extension member 3 extends to the vicinity of the through hole 1a inside the front side member 1. The extension member 3 is joined to the dash lower 7 by spot welding or the like. The extension member 3 is joined to the compression rod mounting reinforcement 4 by spot welding or the like. Compression rod mounting reinforce 4
Are joined to the dash lower cross member 2 by spot welding or the like. In the figure, reference numeral 8 denotes a floor panel.

Next, the operation will be described. First, the load applied to the front side member 1 at the time of a collision will be described with reference to FIGS. At the beginning of the collision, a load of Fl shown in FIG. 5 is applied from the front of the front side member 1. Due to this load, an upward moment acts on the extension member 3.
When the amount of deformation of the collision increases, the engine and transmission 11 retreats, the drive shaft 12 also retreats together with the transmission, and the drive shaft 12 interferes with the rear portion of the front side member 1 and FIG.
The force of F2 shown in the figure also works at the same time.

In the present invention, since the load is transmitted to the extension member 3 by contact between the through hole 1a and the extension member 3, the vertical offset between the front portion of the front side member 1 and the through hole 1a. The amount is small, and the moment acting on the extension member 3 is small. Similarly, the load is transmitted to the extension member 3 by contact between the through hole 1a and the extension member 3 for F2. Since the extension member 3 is joined to the dash lower 7, the load received at the front part of the extension member 3 is efficiently distributed to the dash lower 7. Therefore, the rear portion of the side member can be made lightweight. Also, the compression rod mounting reinforcement 4 and the extension member 3 are joined to the input from the suspension, and the extension member 3 is joined to the dash lower 7, so that the rigidity of the mounting portion of the suspension is improved.

FIGS. 6 and 7 show a second embodiment. In the second embodiment, the extension member 31 is disposed on the indoor side, the extension member 31 is divided before and after the dash lower 71, and the front and rear dash lowers 7 are respectively provided.
These are joined by spot welding or the like. The effect is the same as that of the first embodiment, but the floor can be arranged low, so that a wide room can be secured. still,
In the figure, reference numeral 9 denotes an extension member front.

FIGS. 8 and 9 show a third embodiment. In the third embodiment, the extension member 32 is divided before and after the dash lower cross member 22 and the front and rear are joined to the dash lower cross member 22 by spot welding or the like, and the effect is the same as that of the first embodiment. .
In the figure, reference numeral 92 denotes an extension member front.

[0010]

As described above, according to the present invention, the configuration is such that the through-hole is provided at the rear portion of the front side member, and the front portion of the extension member extends to the vicinity of the through-hole inside the front side member. The extension member is joined to the dash lower by spot welding etc., the extension member is joined to the compression rod mounting reinforcement by spot welding, etc., and the compression rod mounting reinforcement is joined to the dash lower cross member by spot welding etc. The load can be efficiently distributed to the input from the front part of the front side member in the early stage of the collision and the input from the through hole at the rear part of the front side member after the deformation progresses. , Lightweight structure. In addition, the effect of improving the rigidity of the suspension mounting portion can be obtained.

[Brief description of the drawings]

FIG. 1 is a perspective view showing a rear structure of a front side member according to Embodiment 1 of the present invention.

FIG. 2 is a sectional view taken along line AA of FIG.

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

FIG. 4 is a front side member and an engine of the present invention;
FIG. 3 is a diagram illustrating a positional relationship between a transmission and a drive shaft.

FIG. 5 is a diagram showing an input applied to a front side member at the time of a collision.

FIG. 6 is a perspective view illustrating a rear structure of a front side member according to Embodiment 2 of the present invention.

FIG. 7 is a sectional view taken along the line CC of FIG. 6;

FIG. 8 is a perspective view showing a rear structure of a front side member according to Embodiment 3 of the present invention.

FIG. 9 is a sectional view taken along line DD of FIG. 8;

FIG. 10 is an explanatory view showing a rear structure of a front side member according to a conventional example.

[Description of Signs] 1 Front side member 1a Through hole 2 Dash lower cross member 3 Extension member 4 Compression rod mounting reinforcement 5 Front pillar lower 6 Side sill 7 Dash lower 8 Floor 9 Extension member front 11 Engine & transmission 12 Drive shaft 21 Dash Lower cross member 22 Dash lower cross member 31 Extension member 32 Extension member 71 Dash lower 92 Extension member front

Claims (3)

[Claims] In a rear structure of a front side member including a front side member having a through hole at a rear portion thereof, an extension member, a dash lower cross member, a dash lower, and a compression rod mounting reinforcement, The front part is extended to the vicinity of the through hole inside the front side member, the extension member is joined to the dash lower and the compression rod mounting reinforce, and the compression rod mounting reinforce is joined to the dash lower cross member Rear structure of front side members. 2. A front side member having a through hole at a rear portion, an extension member, an extension member front, a dash lower cross member,
In the rear structure of the front side member consisting of the dash lower and the compression rod mounting reinforcement, the extension member and the extension member front are joined to the dash lower, and the front of the extension member front extends to near the through hole inside the front side member The extension member front is joined to a compression rod mounting reinforce, and the compression rod mounting reinforce is connected to a dash lower cross member. 3. A front side member having a through hole at a rear portion, an extension member, an extension member front, a dash lower cross member,
In the rear structure of the front side member composed of the dash lower and the compression rod mounting reinforcement, the extension member and the extension member front are joined to the dash lower cross member and the compression rod mounting reinforcement, and the extension member is joined to the dash lower, The rear structure of the front side member, wherein the compression rod mounting reinforcement is joined to the dash lower cross member, and the front of the extension member front is extended to near the through hole inside the front side member.