JPH05229452A - Front part car body structure of automobile - Google Patents

Abstract

PURPOSE:To reduce the force transmitted to a front floor by providing beads to at least one side of a front side member and a floor under reinforcement, and making to give a compression deformation to the connection when a force is operated to the front side member from the front side of the car body. CONSTITUTION:When a force is operated from the front side of a car body to a front side member 12, the force is transmitted from the front side member 12 to a floor under reinforcement 22 through a connection 22. In this case, in the connection 22, beads 24 are provided in the floor under reinforcement 20, and the connection 22 is made liable to be compression-deformed to the force from the front side of the car body. As a result, when the force is operated from the front side of the car body to the front side member 12, the connection 22 is compression-deformed by making the beads 24 as the core, and the energy of the force operated from the front side member 12 to the floor under reinforcement 20 can be absorbed sufficiently.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a front body structure of an automobile, and more particularly to a front body structure of an automobile in which a front side member and a floor underline force are connected.

[0002]

2. Description of the Related Art Generally, a pair of front side members extending in the front-rear direction of a vehicle body are provided in the vicinity of lower portions of both ends of a vehicle body in a vehicle width direction, and these front side members are attached to a floor underline force. An example of a front body structure of a vehicle connected to the vehicle is disclosed in Japanese Utility Model Laid-Open No. 2-148882.

As shown in FIG. 8, in a front body structure 70 of this automobile, a rear end portion 72A of a front side member 72 is inserted into a front end portion 74A of a floor underline force 74 and rigidly joined thereto. Therefore, when a force (arrow F in FIG. 8) acts on the front side member 72 from the front of the vehicle body, this force can be efficiently transmitted to the floor underline force 74.

[0004]

However, in the front body structure of this automobile, the rear end portion 72A of the front side member 72 and the floor underline force 7 are provided.
Since the joint portion 75 with the front end portion 74A of No. 4 has a high rigidity and is difficult to be deformed, the joint portion 75 hardly absorbs the force energy. Therefore, the force input to the front side member 72 is directly applied to the floor underlining force 7.
4 is transmitted to the front floor 76 joined to the floor undraining force 74 to increase the deformation in the vehicle interior.

That is, the force transmitted from the front of the vehicle body is transmitted in the order of the front side member 72, the floor undraining force 74, and the front floor 76.
Since the joint 75 has a high rigidity, energy is hardly absorbed in the joint 75.

Therefore, the force that has entered the front side member 72 is not sufficiently dampened and is transmitted to the front floor 76 via the floor undraining force 74, whereby the deformation of the front floor 76 becomes large and the deformation in the vehicle compartment occurs. Will be enormous. In addition, a connecting portion 75 between the front side member 72 and the floor underline force 74.
Since it is difficult to deform, a large amount of strain is generated at the rear end position of the joint portion 75, which also causes buckling leading to large deformation.

In view of the above facts, the present invention can absorb the energy of the force acting on the front side member from the front of the vehicle body and reduce the force transmitted to the front floor joined to the floor underline force. The aim is to obtain a possible front body structure of the vehicle.

[0008]

The invention according to claim 1 is
A front side member is provided near the lower portions of both ends of the vehicle body in the vehicle width direction along the vehicle front-rear direction, and a front end is provided behind the front side member along the vehicle front-rear direction and has a front end of the front side member. A front vehicle body structure of an automobile having a floor undrining force coupled to a rear end portion, wherein the front side member and the floor undulating line are provided at a coupling portion between the front side member and the floor undulating force. It is characterized in that a bead is provided on at least one of the force and the connecting portion is compressed and deformed when a force acts on the front side member from the front of the vehicle body.

[0009]

In the vehicle body structure for a front part of an automobile according to the first aspect of the present invention, when a force acts on the front side member from the front of the vehicle body, this force acts on the connecting portion between the front side member and the floor underline force. After that, it is transmitted from the front side member to the floor underlining force. At this time, at the joint, a bead is provided on at least one of the front side member and the floor underline force, and the bead serves as a core to compressively deform the joint, and the front side member to the floor. The energy of the force acting on the underline force can be sufficiently absorbed. Therefore, the force transmitted to the front floor joined to the floor underlining force is reduced, and the deformation in the vehicle interior can be reduced.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the front body structure of an automobile according to the present invention will be described with reference to FIGS. In addition, arrow F in the figure
R indicates the vehicle body front direction, arrow UP indicates the vehicle body upward direction, and arrow IN indicates the vehicle widthwise direction.

As shown in FIG. 4, the front portion 10 of the vehicle body 10
Front side members 12 are arranged in the vicinity of lower portions of both ends of A in the vehicle width direction along the front-rear direction of the vehicle body, and a front end portion of the front side members 12 is not illustrated with a bumper reinforcement 14 interposed therebetween. Front bumper is installed.

As shown in FIG. 1, the front side member 12 includes a front side member outer panel 16 which constitutes an outer side portion of the front side member 12 in the vehicle width direction.
The front side member 12 is formed of a front side member inner panel 18 that forms an inner side portion in the vehicle width direction.

The cross-sectional shape of the front portion 16A of the front side member outer panel 16 when viewed from the front-rear direction of the vehicle body is U-shaped with the opening facing inward in the vehicle width direction. Front side member Outer panel 16 Upper part 16A front wall 1
A vehicle width direction inner end portion of 6B is bent upward in the vehicle body vertical direction to form a flange 16C, and a vehicle width direction inner end portion of a lower wall portion 16D of a front portion 16A of the front side member outer panel 16 is formed in a vehicle body vertical direction. Bend downward 1
It is 6E.

The front side member inner panel 18 has a flat plate shape, and an upper edge 18A of the front side member inner panel 18 is welded to an inner side surface of the flange 16C of the front side member outer panel 16 in the vehicle width direction. Further, a lower end edge portion 18B of the front side member inner panel 18 is welded to a vehicle width direction inner side surface of a flange 16E of the front side member outer panel 16. Therefore, the front part of the front side member 12 is the front part 16 of the front side member outer panel 16.
It has a closed cross-section structure composed of A and the front side member inner panel 18.

The rear portion 16F of the front side member outer panel 16 is curved rearwardly of the lower side of the vehicle body along the dash panel 17, and the cross-sectional shape of the rear portion 16F of the front side member outer panel 16 as viewed from the vehicle front-rear direction is as follows. The opening is formed in a U shape with the vehicle body vertical direction upward.

As shown in FIG. 2, the vehicle body vertical direction upper end portion of the outer side wall portion 16G of the rear portion 16F of the front side member outer panel 16 is bent outward in the vehicle width direction to form a flange 16H, and the front side member outer panel 16 is formed. The vehicle body vertical direction upper end portion of the inner side wall portion 16J of the rear portion 16F is bent inward in the vehicle width direction to form a flange 16K.

As shown in FIG. 1, the upper end of the flange 16H extends inward in the vehicle width direction along the rear edge of the upper wall 16B to form a flange 16M. The flange 16H, the flange 16K, and the flange 16M are welded to the vehicle cabin outer surface of the dash panel 17, respectively. A front end portion of a floor undrinning force 20 disposed along the vehicle front-rear direction behind the front side member outer panel 16 is inserted into the U-shape of the rear end portion of the front side member outer panel 16.

As shown in FIG. 3, the cross-sectional shape of the floor undulating force 20 when viewed from the front-rear direction of the vehicle body is a U-shape with the opening facing upward in the vehicle vertical direction. The upper end portion of the outer wall portion 20A of the floor undulating force 20 in the vehicle body vertical direction is bent outward in the vehicle width direction to form the flange 2
0B, and the upper end portion of the inner side wall portion 20C of the floor underlining force 20 in the vehicle body vertical direction is bent inward in the vehicle width direction to form a flange 20D.

As shown in FIG. 3, the floor undraining force 20 and the front side member outer panel 16 are shown.
In the joint portion 22 with, the flange 20B and the flange 20D of the floor underline force 20 are joined to the flange 16H and the flange 16K of the front side member outer panel 16 by spot welding, respectively. Further, the lower wall portion 20E of the floor undulating force 20 is attached to the front side member outer panel 16
It is joined to the lower wall portion 16L by spot welding.

A front floor 30 is disposed above the floor underlining force 20, and a flange 20B and a flange 20D of the floor underlining force 20 are welded to the lower surface of the front floor 30 respectively.

As shown in FIG. 2, the bead 2 is provided at the front end of the floor undraining force 20 which serves as the connecting portion 22.
4 are formed.

As shown in FIG. 3, the bead 24 is provided on the outer side of the lower wall portion 20E of the floor undraining force 20 in the vehicle width direction to the central portion of the outer side wall portion 20A in the vehicle body vertical direction. A bead 24A and an inner bead having a triangular cross-section that is provided to face the outer bead 24A and extend from the vehicle width direction inner side portion of the lower wall portion 20E of the floor undraining force 20 to the vehicle body vertical direction center portion of the inner side wall portion 20C. 24B and a pair,
As shown in FIG. 2, two pairs are formed at intervals in the front-rear direction of the vehicle body. Therefore, when a force is applied to the joint portion 22 from the front of the vehicle body, the bead 24 serves as a core to compressively deform the joint portion 22.

Next, the operation of this embodiment will be described. In the front vehicle body structure of the vehicle of this embodiment, when a force (arrow F in FIG. 1) acts on the front side member 12 from the front of the vehicle body, this force passes from the front side member 12 to the floor underside through the joint portion 22. Reach to Reinforce 20. At this time, in the joint portion 22, the bead 24 is provided on the floor underline force 20, and the joint portion 22 is easily compressed and deformed by a force from the front of the vehicle body.

Therefore, when a force is applied to the front side member 12 from the front of the vehicle body, the bead 24 serves as a core to compressively deform the joint portion 22, and the front side member 12 is compressed.
Therefore, the energy of the force acting on the floor undulating force 20 can be sufficiently absorbed. Therefore, the force transmitted to the front floor 30 coupled to the floor undulating force 20 becomes small, and the deformation in the vehicle interior can be made small.

In the present embodiment, the bead 24 is provided only on the floor undraining force 20, but as shown in FIG. 5, the bead 24 is provided on both the floor undulating force 20 and the front side member outer panel 16. May be. Further, as shown in FIG. 6, the bead 24 may be provided only on the front side member outer panel 16.

Although the bead 24 has a triangular cross-section in this embodiment, the bead has a cross-sectional shape which is not limited to this. For example, as shown in FIG. Other shapes may be used.

[0027]

According to the vehicle body structure for a front portion of an automobile of the present invention, a bead is provided on at least one of the front side member and the floor underline force at the connecting portion between the front side member and the floor underline force.
When a force is applied to the front side member from the front of the vehicle body, the joint is compressed and deformed, so the energy of the force from the front of the vehicle body acting on the front side member is absorbed, and it is joined to the floor underline force. It has an excellent effect that the force transmitted to the front floor can be reduced.

[Brief description of drawings]

FIG. 1 is a perspective view showing a front vehicle body structure of an automobile according to an embodiment of the present invention as seen from a vehicle body front obliquely outer side.

FIG. 2 is a perspective view of a connecting portion between a front side member and a floor underline force of a front body structure of an automobile according to an embodiment of the present invention, as viewed from the front and diagonal outside of the vehicle body.

FIG. 3 is a sectional view taken along line 3-3 of FIG.

FIG. 4 is a perspective view of the front part of the vehicle body to which the front vehicle body structure of the vehicle according to the embodiment of the present invention is applied, as seen from the diagonally outer front side of the vehicle body.

FIG. 5 is a perspective view of a front side member of a front vehicle body structure for an automobile according to another embodiment of the present invention, showing a coupling portion between a front side member and a floor undraining force as seen from an obliquely outer front side of the vehicle body.

FIG. 6 is a perspective view of a connecting portion between a front side member and a floor underlining force of a front vehicle body structure for an automobile according to another embodiment of the present invention, as seen from a vehicle front oblique outer side.

FIG. 7 is a cross-sectional view corresponding to FIG. 3, showing a connecting portion between a front side member and a floor underlining force of a front vehicle body structure for an automobile according to another embodiment of the present invention.

FIG. 8 is a side view showing a front body structure of a conventional automobile.

[Explanation of symbols]

 10 Body 10A Front 12 Front Side Member 16 Front Side Member Outer Panel 18 Front Side Member Inner Panel 20 Floor Underlining Force 22 Joint 30 Front Floor 24 Bead 24A Outside Bead 24B Inner Bead

Claims (1)

[Claims] 1. A front side member disposed along the vehicle front-rear direction in the vicinity of lower portions of both ends of a vehicle body front portion in a vehicle width direction,
A front vehicle body structure for an automobile, comprising: a floor undrining force, which is disposed behind the front side member along the front-rear direction of the vehicle body and has a front end portion joined to a rear end portion of the front side member. A bead is provided on at least one of the front side member and the floor undraining force at a connecting portion between the front side member and the floor undulating force.
A front vehicle body structure for an automobile, wherein the joint portion is compressed and deformed when a force is applied to the front side member from the front side of the vehicle body.