JPH09175437A - Body front part structure for automobile - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reduce the shifting amount to a cabin side at the rear end of a front side member, in a front side collision time, by combining the upper surface of the front side member and the upper surface of a plate continuously at the connection, in the structure to reinforce the connection of the front side member and a dash panel by the plate. SOLUTION: In a car engine room, a front side member 1 extending in the longitudinal direction of the vehicle is connected with a dash panel 2 to partition the engine room and a cabin at its rear end, from where, it is extended to the rear side of the vehicle, slipping into the lower side of the dash panel 2, as a floor member 3. By setting a plate 4 from the cabin side, near the connection of the rear end of the front side member 1 and the dash panel 2, a reinforcement is carried out. The upper surface 1a of the front side member 1, and the upper surface 4a of the plate 4 are made possible to connect continuously without generating a bending, at the part A (the connection of the upper surfaces 1a and 4a, and the dash panel 2).

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a reinforcing structure for a front end of a vehicle body front side member.

[0002]

2. Description of the Related Art FIG. 14 shows the structure of a front portion of a general vehicle. The rear end portions of front side members 01, 01 provided on the left and right of the engine compartment separate the engine compartment from the cabin. It is connected to the dash panel 02. As a conventional reinforcing structure of the rear end portion of the front side member applied to such a structure, for example, Japanese Patent Laid-Open No. 6-68242
What is shown in Japanese Patent Publication No. 4-47684 (FIG. 15)
Is known. In this example, the portion where the rear end of the front side member 01 is joined to the dash panel 02 is reinforced by setting the plate 03 from the cabin side.

[0003]

In the conventional reinforcing structure of the rear end portion of the front side member as described above, for example, when an input is applied to the front side member 01 from the front at the time of a frontal collision of the vehicle, etc. , A (the connecting portion between the front side member 01 and the dash panel 02) may be pushed into the cabin side to some extent (FIG. 16).

The present invention has been made paying attention to such a point, and an object thereof is to efficiently reinforce the vicinity of the portion A with a plate to solve the above problems.

[0005]

In order to achieve this object, in the invention according to claim 1, a front side member extending in the vehicle front-rear direction in the front part of the vehicle body partitions the engine room from the cabin. In the structure where it is connected to the dash panel and the plate is set from the cabin side in the vicinity of the joint between the front side member and the dash panel to reinforce the vicinity of the joint, the upper surface of this front side member and this The upper surface of the plate was continuously connected without bending at this joint. In the invention described in claim 1, as described in claim 2, the upper surface of the front side member and the upper surface of the plate are continuously connected without bending at the joint portion, and the continuous surface is a substantially horizontal plane. Or the flat surface may be formed such that the continuous surface descends downward of the vehicle as it goes to the rear of the vehicle as described in claim 3. As described in (1), the continuous surface may be formed in a curved shape that descends downward in the vehicle as the vehicle goes rearward.

Further, according to the invention of claim 5, in the front part of the vehicle body of the vehicle, a front side member extending in the vehicle front-rear direction in the engine room is connected to a dash panel separating the engine room and the cabin. In the structure where the dash panel near the joint between the member and the dash panel is provided with a protrusion on the cabin side to reinforce the vicinity of the joint, the upper surface of this front side member and the cabin side of this dash panel The upper surface of the bulge portion was continuously connected at this joint without bending. In the invention described in claim 5, as described in claim 6, the upper surface of the front side member and the upper surface of the protruding portion of the dash panel toward the cabin are continuously connected without bending at the joint portion, Further, the continuous surface may be formed in a substantially horizontal plane shape, or as described in claim 7, the continuous surface is formed in a flat surface shape that descends downward in the vehicle as the vehicle goes rearward. Alternatively, as described in claim 8, the continuous surface may be formed in a curved surface shape that descends downward in the vehicle as the vehicle goes rearward.

[0007]

Embodiments of the present invention will be described below with reference to the drawings. 1 to 3 show a first embodiment of the present invention.
It is a figure showing an embodiment. In each figure, FR
Indicates the front of the vehicle, and UP indicates the upper side of the vehicle. First, the structure will be described. In the engine room of a vehicle, a front side member 1 extending in the vehicle front-rear direction is joined at its rear end to a dash panel 2 that separates the engine room from the cabin. As it extends into the lower part of the dash panel 2, it extends toward the rear of the vehicle. At this time, reinforcement is made by setting a plate 4 from the cabin side in the vicinity of the joint between the rear end of the front side member 1 and the dash panel 2.
Also, the upper surface 1a of the front side member 1 and the plate 4
The upper surface 4a of the above is continuously connected without being bent at the A portion (this A portion means a joint portion of the upper surface 1a of the front side member 1, the dash panel 2, and the upper surface 4a of the plate 4). In this example, since the front side member 1 extends horizontally to the rear end portion, both the upper surface 1a of the front side member 1 and the upper surface 4a of the plate 4 are horizontal and are continuously connected.

Next, the operation will be described. For example, in the deformation mode in the vicinity of the rear end of the front side member 1 in response to an input from the front such as in the case of a frontal collision of the vehicle, the section B is a bent portion of the front side member 1 having a thin cross section and weak strength. Alternatively, there is a possibility that the mode tends to be bent and rotated around the C portion, and the entire rear end portion of the front side member 1 pushes the dash panel 2 toward the cabin side. Here, FIG. 17 shows a deformation mode diagram in the case where the structure has no reinforcing plate 4 and is bent at the C portion.

Here, as in the above-mentioned conventional example, if reinforcement is made by setting the plate 4 from the cabin side in the vicinity of the joint between the rear end of the front side member 1 and the dash panel 2, the front side Although the amount by which the rear end of the side member 1 pushes the dash panel 2 is reduced, it is difficult to avoid pushing in the vicinity of the portion A (FIG. 16).
reference).

However, in the first embodiment, when the plate 4 is set from the cabin side in the vicinity of the joint between the rear end of the front side member 1 and the dash panel 2, the plate 4 is attached to the front side member 1. The upper surface 1a of the front side member 1 is configured to cover the rear end portion.
Since the upper surface 4a of the plate 4 and the upper surface 4a of the plate 4 are continuously connected without bending at the portion A, the plate 4 efficiently receives the input from the front side member 1 on the upper surface 4a, and It can be expected that the amount by which the end portion pushes the dash panel 2 toward the cabin is reduced more than in the conventional example (see FIG. 4).

A second embodiment is shown in FIGS. This is an example of the case where the front side member 1 is gently bent downward near the rear end so that the front side member 1 is smoothly connected to the floor member 3. Again, the upper surface 1a of the front side member 1 and the upper surface 4a of the plate 4 are , A portion is continuously connected without bending. In this case, the upper surface 1a of the front side member 1 and the upper surface 4a of the plate 4 are
Can be linearly continuous or curved continuously. The operation and effect are the same as in the first embodiment.

A third embodiment is shown in FIGS.
This is an example in which, in the first embodiment, instead of setting the plate 4, a protruding portion 2c having the same shape as the plate 4 of the first embodiment is set in the dash panel 2. The operation and effect are the same as those of the above-described embodiment.

A fourth embodiment is shown in FIGS. 11 to 13. This is an example in which, in the second embodiment, instead of setting the plate 4, a protruding portion 2c having the same shape as the plate 4 of the second embodiment is set in the dash panel 2. The operation and effect are the same as those of the third embodiment described above.

In each of the embodiments, the front side member 1 and the floor member 3 can be formed as an integrally molded product or a separately molded product. The front side member 1 can be a plate member having a closed cross section formed by welding or a member having a closed cross section formed by extrusion molding. The cross-sectional shape of the front side member 1 is not limited to a quadrangle, but may be a pentagon or more or a circle. In order to overcome the problem of formability, the dash panel 2 can be used even if a plurality of divided parts in the vehicle left-right direction are joined by welding or the like at arbitrary dividing lines extending in the vehicle front-rear direction. is there. By the way, in FIGS. 18A to 18C, the upper surface 1a of the front side member 1 and the upper surface 4a of the plate 4 are at the joint between the rear end of the front side member 1, the dash panel 3 and the front end of the plate 4. It shows a continuous but bent structure, in which the movement of this connecting part towards the cabin side during a vehicle frontal collision cannot be reduced as much as the present invention.

[0015]

As described above, according to the present invention, the plate 4 is set from the cabin side in the vicinity of the joint between the rear end of the front side member 1 and the dash panel 2 according to the present invention. , Or dash panel 2
By setting a protruding portion 2c corresponding to the plate 4, reinforcement is performed so as to cover the entire rear end portion of the front side member 1, and the upper surface 1a of the front side member 1 and the upper surface 4a of the plate 4 or the protruding portion. Part 2c
Since the upper surface of the front side member 1 is continuously connected without bending at the connecting portion, the input from the front side member 1 can be efficiently received by the upper surface 4a of the plate or the upper surface of the protruding portion 2c of the dash panel 2, It is possible to obtain the effect that the amount by which the rear end of the side member 1 pushes the dash panel 2 toward the cabin can be expected to be reduced more than in the conventional example.

[Brief description of the drawings]

FIG. 1 is a perspective view showing a first embodiment of the present invention.

FIG. 2 is a sectional view taken along line S2-S2 of FIG.

FIG. 3 is an exploded perspective view of the first embodiment.

FIG. 4 is a deformation mode diagram of a rear end portion of a front side member with respect to an input from the front according to the first embodiment.

FIG. 5 is a perspective view of a second embodiment.

6 is a sectional view taken along line S6-S6 of FIG.

FIG. 7 is an exploded perspective view of the second embodiment.

FIG. 8 is a perspective view of a third embodiment.

9 is a sectional view taken along line S9-S9 of FIG.

FIG. 10 is an exploded perspective view of a third embodiment.

FIG. 11 is a perspective view of a fourth embodiment.

12 is a sectional view taken along line S12-S12 of FIG.

FIG. 13 is an exploded perspective view of a fourth embodiment.

FIG. 14 is a perspective view showing a structure of a general front portion of a vehicle body.

FIG. 15 is a perspective view showing a conventional example.

FIG. 16 is a deformation mode diagram of the rear end portion of the front side member with respect to the input from the front in the conventional example.

FIG. 17 is a deformation mode diagram of a rear end portion of a front side member in a structure having no reinforcement.

FIG. 18 is a cross-sectional view showing an example in which a bent portion is provided on the upper surface of the coupling portion.

[Explanation of symbols]

 1 Front Side Member 1a Top Side of Front Side Member 2 Dash Panel 2a Vehicle Horizontal Center Line 2c Projection 3 Floor Member 4 Plate 4a Top

Claims (8)

[Claims] 1. A front side member extending in the vehicle front-rear direction in a front portion of a vehicle body of a vehicle is coupled to a dash panel that separates the engine room from the cabin. The coupling portion between the front side member and the dash panel. In the structure where reinforcement is made near the joint by setting the plate from the cabin side in the vicinity, the upper surface of this front side member and the upper surface of this plate are connected continuously without bending at this joint. The front structure of the vehicle body is characterized by 2. The upper surface of the front side member and the upper surface of the plate are continuously connected without bending at the joint portion, and the continuous surface is a substantially horizontal surface. Body front structure. 3. An upper surface of the front side member and an upper surface of the plate are continuously connected to each other without being bent at the joint portion, and the continuous surface is a plane that descends downward as the vehicle goes rearward. The vehicle body front structure according to claim 1, wherein: 4. The upper surface of the front side member and the upper surface of the plate are continuously connected to each other without bending at the joint portion, and the continuous surface is a curved surface that descends downwardly of the vehicle as it goes rearward of the vehicle. The vehicle body front structure according to claim 1, wherein: 5. A front side member extending in the vehicle front-rear direction in a front portion of a vehicle body of a vehicle is coupled to a dash panel that separates the engine room from the cabin. The coupling portion between the front side member and the dash panel. In the structure where reinforcement is made in the vicinity of the joint by setting the protruding part to the cabin side in the nearby dash panel, the upper surface of this front side member and the upper surface of the protruding part to the cabin side of this dash panel, A vehicle body front structure characterized by being connected continuously without bending at this joint. 6. The upper surface of the front side member and the upper surface of the protruding portion of the dash panel to the cabin side are continuously connected without bending at the connecting portion, and the continuous surface is a substantially horizontal surface. A vehicle body front structure according to claim 5. 7. The upper surface of the front side member and the upper surface of the protruding portion of the dash panel to the cabin side are continuously connected without bending at the connecting portion, and the continuous surface goes toward the rear of the vehicle. The vehicle body front structure according to claim 5, wherein the front surface structure is a plane that descends downwardly of the vehicle. 8. The upper surface of the front side member and the upper surface of the protruding portion of the dash panel to the cabin side are continuously connected without bending at the connecting portion, and the continuous surface goes toward the rear of the vehicle. The vehicle body front structure according to claim 5, wherein the curved surface is a curved surface that descends downward of the vehicle.