JP2020100375A - Vehicle body structure - Google Patents

Abstract

To provide a vehicle body structure that can suppress a vehicle body from deforming at the time of collision of a vehicle.SOLUTION: Rear side member rear parts 22 are provided in pair at a rear part of a vehicle 12 and on the outside in a vehicle width direction and are extended in a vehicle longitudinal direction, which are made of die cast. Rear side member front parts 20 are connected in pair to front end parts 30 of the rear side member rear parts 22 and are extended in the vehicle longitudinal direction, which are made of steel plates. Beads 28 are provided at the rear side member front parts 20 and are opposed to folded-back wall parts 38 of the rear side member rear parts 22. Therefore, even if joint of a joint part 34 is released at rear collision, the beads 28 contact the folded-back wall parts 38 of the rear side member rear parts 22, which can suppress further relative movement. This can suppress a vehicle body from deforming at the time of collision of the vehicle.SELECTED DRAWING: Figure 1

Description

The present invention relates to a vehicle body structure.

Patent Document 1 discloses a vehicle body structure. In this vehicle body structure, the side member is provided on the rear portion of the vehicle and on the outer side in the vehicle width direction, and has a side member extending in the vehicle front-rear direction. This side member is made of aluminum die-cast, which improves the bending rigidity of the vehicle body.

JP, 2013-506588, A

However, as in the above-mentioned prior art, when the side member is made of aluminum die cast, the bending rigidity is improved as compared with the steel plate, but brittleness is increased. Therefore, at the time of a side collision of the vehicle (hereinafter, simply referred to as “side collision”), the side member is destroyed in the case of a side collision in which a collision load is concentrated on a part of the vehicle, such as a so-called pole collision, Debris may affect surrounding vehicle components (fuel tank, etc.). For this reason, it is desirable that the side member that is particularly likely to affect the vehicle structure is made of a steel plate, but the collision load is input to the joint between the die-cast part and the steel plate part. Then, there is a possibility that the joint will be disengaged and the stress will be concentrated on the steel plate portion to be deformed, and this deformation will cause the die-casted portion to move largely and the entire vehicle body to be greatly deformed. Therefore, the above-mentioned prior art has room for improvement in this respect.

In view of the above facts, the present invention has an object to obtain a vehicle body structure capable of suppressing deformation of the vehicle body at the time of vehicle collision.

A vehicle body structure according to a first aspect of the invention is a pair of left and right first vehicle body skeleton members that are provided outside in a vehicle width direction of a vehicle, extend in the vehicle front-rear direction, and are made of die cast. A pair of left and right second vehicle body frame members joined to the front end of the first vehicle body frame member and extending in the vehicle front-rear direction and made of steel plates, the first vehicle body frame member and the second vehicle body The skeleton member is provided on either one of the skeleton members, and has a facing portion facing the other end face of the first vehicle body skeleton member or the second vehicle body skeleton member.

According to the invention described in claim 1, the vehicle body structure has the first vehicle body skeleton portion, the second vehicle body skeleton portion, and the facing portion. The first vehicle body skeleton portion is provided in a pair on the outside in the vehicle width direction of the vehicle, and extends in the vehicle front-rear direction and is made of die cast. The second vehicle body frame portion is paired with the front end portion of the first vehicle body frame portion, extends in the vehicle front-rear direction, and is made of a steel plate. The facing portion is provided on either one of the first vehicle body skeleton portion and the second vehicle body skeleton portion, and faces the other end surface of the first vehicle body skeleton portion or the second vehicle body skeleton portion. Therefore, when a collision load is input to the second vehicle body skeleton portion and the first vehicle body skeleton portion at the time of a vehicle collision, particularly a vehicle rear surface collision (hereinafter, simply referred to as “rear collision”), the first vehicle body skeleton portion is When trying to move relative to the second vehicle body skeleton, stress concentrates on the joint portion between the first vehicle body skeleton portion and the second vehicle body skeleton portion. In this case, even if the joint portion is disengaged, the facing portion contacts the other end surface of the first vehicle body skeleton portion or the second vehicle body skeleton portion, so that further relative movement can be suppressed.

The vehicle body structure according to the present invention described in claim 1 has an excellent effect that deformation of the vehicle body at the time of a vehicle collision can be suppressed.

FIG. 3 is a schematic perspective view showing a state where a part of a vehicle body rear portion having the vehicle body structure according to the first embodiment is viewed from the vehicle interior side. FIG. 3 is a side view showing a state in which a part of a front portion of a rear side member having the vehicle body structure according to the first embodiment is viewed from the vehicle interior side. It is an expanded sectional view showing the state cut along the AA line in Drawing 2. FIG. 3 is an enlarged cross-sectional view showing a state cut along the line BB in FIG. 2. It is a schematic perspective view which shows the state which looked at a part of vehicle body rear part which has the vehicle body structure which concerns on 2nd Embodiment from the vehicle interior side. It is an expanded sectional view showing the state cut along the CC line in FIG.

(First embodiment)
Hereinafter, the vehicle body structure 10 of the present invention will be described with reference to FIGS. 1 to 4. In addition, arrow FR, arrow UP, and arrow OUT, which are appropriately described in each drawing, respectively indicate the front direction (traveling direction), the upward direction, and the outer side in the vehicle width direction of the vehicle. In the following description, when only the front-rear direction, the left-right direction, and the up-down direction are used, the front-rear direction in the vehicle front-rear direction, the left-right direction in the vehicle left-right direction (vehicle width direction), and the up-down direction in the vehicle up-down direction are indicated unless otherwise specified. To do.

(overall structure)
As shown in FIG. 1, rockers 14 extending in the vehicle front-rear direction are provided on the left and right sides of the vehicle 12. The left and right rockers 14 have a closed cross-sectional shape when cut along a direction (a vehicle vertical direction and a vehicle width direction) orthogonal to the longitudinal direction of the rocker 14, and each of the vehicle bodies 16 has a closed cross-sectional shape. It forms part of the skeleton.

Between the left and right rockers 14, a floor panel (not shown) that extends along the vehicle front-rear direction and the vehicle width direction and constitutes the floor surface of the vehicle interior (cabin) is provided. Both ends are respectively coupled to the left and right rockers 14.

(Rear side member)
A pair of left and right rear side members 18 are provided on the vehicle rear side and the vehicle width direction inner side of the rocker 14, respectively. The rear side member 18 is extended toward the vehicle upper side as it goes toward the vehicle front-rear direction and the vehicle rear side, and the rear side member front portion 20 as a second vehicle body frame portion forming the vehicle front portion and the vehicle rear side. It has a rear side member rear part 22 as a first vehicle body skeleton part that constitutes a part.

(Front of rear side member)
The front portion 20 of the rear side member is made of a steel plate, and has a cross-section that is orthogonal to the longitudinal direction and has a substantially U-shape that opens outward in the vehicle width direction (see FIG. 3 ). A front end portion 23 of the rear side member front portion 20 is overlapped with a rear end portion 24 of the rocker 14 from above the vehicle and from the inside in the vehicle width direction, and is joined to the rear end member 24 via a welding portion (not shown).

As shown in FIG. 2, a plurality of beads 28 are formed as opposed parts on the vehicle width direction inner side wall part 26 of the rear side member front part 20. As an example, the bead 28 is formed in a convex shape toward the outside in the vehicle width direction and extends along the longitudinal direction of the rear side member front portion 20. The plurality of beads 28 are provided so as to be separated from each other in the substantially vertical direction of the vehicle.

(Rear side member rear)
Although not shown, the rear side member rear portion 22 is formed by die-casting and has a substantially U-shaped cross-sectional shape that is orthogonal to the longitudinal direction and opens outward in the vehicle width direction like the rear side member front portion 20. .. As shown in FIG. 1, a rear end member 32 of the rear side member front portion 20 is overlapped with a front end portion 30 of the rear side member rear portion 22 from the vehicle upper side and the vehicle width direction inner side and an SPR (self-piercing rivet) not shown. Are joined by. In other words, the portion where the front end portion 30 of the rear side member rear portion 22 and the rear end portion 32 of the rear side member front portion 20 overlap corresponds to the coupling portion 34.

As shown in FIG. 4, a folded wall portion 38 as an end surface is formed at the front end portion 30 of the vehicle width direction inner side wall portion 36 of the rear side member rear portion 22. The folded wall portion 38 extends outward from the front end portion 30 toward the vehicle front side in the vehicle width direction. Therefore, the folded wall portion 38 is opposed to the bead 28 of the rear side member front portion 20 in the longitudinal direction of the rear side member 18.

A rear end portion (not shown) of the rear side member rear portion 22 is joined to a pair of rear floor side members that are provided on a rear floor panel that constitutes a floor surface of the rear portion of the vehicle and extend in the vehicle front-rear direction to the rear end of the vehicle body. Has been done.

(Operation/effect of the first embodiment)

In the present embodiment, as shown in FIG. 4, the vehicle body structure 10 has a rear side member rear portion 22, a rear side member front portion 20, and a bead 28. The rear side member rear portions 22 are provided in a pair at the rear portion of the vehicle 12 and outside in the vehicle width direction, extend in the vehicle front-rear direction, and are made of die cast. The rear side member front portion 20 is joined to the front end portion 30 of the rear side member rear portion 22 in a pair, extends in the vehicle front-rear direction, and is made of a steel plate. The bead 28 is provided on the front portion 20 of the rear side member and faces the folding wall portion 38 of the rear portion 22 of the rear side member. Therefore, when a collision load is input to the rear side member front portion 20 and the rear side member rear portion 22 at the time of a vehicle collision, particularly at the time of a rear collision, the rear side member rear portion 22 attempts to move relative to the rear side member front portion 20. The stress concentrates on the joint portion 34 between the front portion 20 of the rear side member 22 and the front portion 20 of the rear side member. In this case, even if the joint portion 34 is disengaged, the bead 28 abuts on the folded wall portion 38 of the rear side member rear portion 22, so that further relative movement can be suppressed. Thereby, the deformation of the vehicle body at the time of a vehicle collision can be suppressed.

In the present embodiment, the folding wall portion 38 is provided on the rear side member rear portion 22, but the configuration is not limited to this, and the folding wall portion 38 may not be provided.

(Second embodiment)
Next, a vehicle body structure according to the second embodiment of the present invention will be described with reference to FIGS. 5 and 6. The same components as those in the first embodiment described above are designated by the same reference numerals and the description thereof will be omitted.

The vehicle body structure 50 according to the second embodiment has a basic configuration similar to that of the first embodiment, and is characterized in that ribs 52 are provided as facing portions.

That is, as shown in FIG. 5, a pair of left and right rear side members 54 are provided on the vehicle rear side and the vehicle width direction inner side of the rocker 14, respectively. The rear side member 54 extends toward the vehicle upper side as it goes toward the vehicle front-rear direction and the vehicle rear side, and the rear side member front portion 56 as the second vehicle body frame portion forming the vehicle front portion and the vehicle rear side. And a rear side member rear portion 58 as a first vehicle body skeleton portion constituting the portion.

(Front of rear side member)
The rear side member front portion 56 is made of a steel plate, and has a cross-sectional shape that is orthogonal to the longitudinal direction and is formed in a substantially U-shape that opens outward in the vehicle width direction. The front end portion 60 of the rear side member front portion 56 is overlapped with the rear end portion 24 of the rocker 14 from above the vehicle and from the inside in the vehicle width direction, and is joined thereto via a welded portion (not shown).

(Rear side member rear)
The rear side member rear portion 58 is made of die-cast and has a substantially U-shaped cross-section shape (not shown) that is orthogonal to the longitudinal direction and opens outward in the vehicle width direction like the rear side member front portion 56. .. A front end portion 62 of the rear side member rear portion 58 is overlapped with a rear end portion 64 of the rear side member front portion 56 from the vehicle upper side and the vehicle width direction inner side and joined by an SPR (self-piercing rivet) not shown. In other words, the portion where the front end portion 62 of the rear side member rear portion 58 and the rear end portion 64 of the rear side member front portion 56 overlap corresponds to the joint portion 66.

As shown in FIG. 6, a rib 52 as an opposing portion is formed at the front end portion 62 of the vehicle width direction inner side wall portion 68 of the rear side member rear portion 58. The rib 52 extends in a direction perpendicular to the surface of the inner wall portion 68 in the vehicle width direction and outward in the vehicle width direction. Therefore, the rib 52 faces the end surface 70 of the rear end portion 64 of the rear side member front portion 56 in the longitudinal direction of the rear side member 54.

(Operation/effect of the second embodiment)
Next, the operation and effect of the second embodiment will be described.

Also with the above structure, the structure is similar to that of the vehicle body structure 10 of the first embodiment except that the ribs 52 are provided instead of the beads 28, and therefore the same effect as that of the first embodiment can be obtained. In addition, since the rib 52 of the rear side member rear portion 58 is configured to face the end surface 70 of the rear side member front portion 56, the rear side member rear portion 22 has a simple structure when the rear side member rear portion 22 is in front of the rear side member during a vehicle collision. It is possible to suppress relative movement with respect to the portion 20. Therefore, it is possible to suppress the deformation of the vehicle body at the time of a vehicle collision while suppressing the cost increase.

In the above-described embodiment, the bead 28 or the rib 52 is provided on either one of the rear side member front portions 20, 56 and the rear side member rear portions 22, 58 which form the rear side members 18, 54. However, the bead 28 and the rib 52 may be applied to other skeleton members extending in the vehicle front-rear direction and connected to the vehicle front-rear direction such as the front side members.

Further, although the facing portion is the bead 28 or the rib 52, the facing portion is not limited to this, and may have another structure such as a flange or a boss.

As described above, the present invention is not limited to the above-described embodiment, and it is needless to say that other than the above-described embodiment, various modifications can be made without departing from the spirit of the invention.

10 vehicle body structure 12 vehicle 20 front part of rear side member (second vehicle body frame member)
22 Rear part of rear side member (first body frame member)
28 beads (opposite part)
30 Front end part 38 Folding wall part (end face)
50 Body Structure 52 Rib (opposing part)
56 Front part of rear side member (second body frame member)
58 Rear Side Member Rear Part (First Body Frame Member)
70 Edge

Claims (1)

A pair of left and right first vehicle body frame members that are provided outside the vehicle width direction of the vehicle, extend in the vehicle front-rear direction, and are made of die cast;
A pair of left and right second vehicle body frame members joined to the front end portion of the first vehicle body frame member and extending in the vehicle front-rear direction and made of steel plates;
An opposing portion that is provided on either one of the first vehicle body frame member and the second vehicle body frame member and that faces the other end surface of the first vehicle body frame member or the second vehicle body frame member;
Car body structure with.