JP6893747B2 - Vehicle structure - Google Patents

Description

The present invention relates to a vehicle structure such as an automobile, and more particularly to a vehicle structure including a side member as a skeleton member of a vehicle body.

As the vehicle structure, for example, as described in Patent Document 1, a structure in which a pair of left and right side members are provided as a skeleton member at the front portion of the vehicle body is often adopted. These pair of side members are arranged at the lower part of the vehicle so as to be spaced apart from each other in the vehicle width direction and extend in the vehicle front-rear direction, and each side member comprises a plurality of side member components. It is formed by joining (welding) in a series.

Here, as shown in FIG. 6, as a configuration example of the side member 3, on the lower surface side of the front floor portion 2a of the vehicle interior, a part of the two side member constituent members 30 and 31 on the front side and the rear side are overlapped with each other. In some cases, a superposed joint portion 32 is provided. Both the front side and the rear side member constituent members 30 and 31 are, for example, cross-section hat-shaped members, but the front side member configuration can correspond to the load input from the front of the vehicle due to the front collision of the vehicle. The member 30 is usually a member having a higher rigidity than the side member constituent member 31 on the rear side.

However, in the above-mentioned prior art, there is room for improvement as described below.

That is, when a front collision of the vehicle occurs and a predetermined load or more is input to the side member 3 from the front side of the vehicle as shown in FIG. 7, the side member 3 is the rear end of the superposition joint portion 32. At the position of 32r (rear end of the side member component 30 on the front side), it is likely to be greatly bent and deformed locally. This is because, in the range shown in FIG. 6 of the side member 3, the overlapped joint portion 32 has the highest rigidity (strength: large), and the region Sf on the front side of the overlapped joint portion 32 has the next highest rigidity. (Strength: large), the rigidity of the rear region Sr is the lowest (strength: small), and the position of the rear end 32r of the overlapping joint portion 32 is large in the vehicle front-rear direction of the side member 3. This is because it is a suddenly changed rigidity break point.
When the front collision of the vehicle occurs, if the side member 3 is locally largely bent and deformed at the position of the rear end 32r of the overlapping joint portion 32 as described above, the load transmissibility of the side member 3 becomes high. It will be impaired, which is disadvantageous in obtaining excellent shock absorption performance. In addition, it is disadvantageous in improving the impact resistance (load resistance) at the time of a front collision of the vehicle.

As a means for solving the above-mentioned problems, it is conceivable to weld a reinforcing member for reinforcing the rear end 32r of the overlapped joint portion 32 to the side member 3 to prevent bending deformation. However, if such a means is adopted, the weight of the vehicle is increased and the manufacturing cost is high.

JP-A-2007-112260

The present invention has been conceived under the above-mentioned circumstances, and can appropriately prevent a predetermined portion of a side member from being locally significantly bent and deformed at the time of a front collision of a vehicle by a simple configuration. It is an object of the present invention to provide a vehicle structure capable of suppressing the impact and improving the impact absorption performance and impact resistance at the time of a front collision of the vehicle.

In order to solve the above problems, the following technical measures are taken in the present invention.

The vehicle structure provided by the present invention is arranged at intervals in the vehicle width direction, and includes a pair of left and right side members extending in the vehicle front-rear direction, and each side member is a front floor portion of a vehicle interior. On the lower surface side of the above, the overlapped joint portion in which the front side region of the rear side member constituent member and the rear side region of the front side member constituent member having higher rigidity are overlapped and joined to each other is formed. In the vehicle structure provided, the overlapped joint and / or the above-mentioned overlapped joint portion and / or the above-mentioned overlapped joint portion when a predetermined or more compressive load is applied from the front side of the vehicle to the rear portion side region of the front side member constituent member. As a portion constituting a rigid breaking point capable of causing bending deformation at the front end position, a part of the side wall portion that stands up in the vertical height direction of the rear region is located on the outer side or the inner side in the vehicle width direction. A bead portion that partially bulges toward the side is provided, and this bead portion is separated from the lower end of the side wall portion in the region near the lower front side of the overlapped joint portion in the side view of the vehicle. It is characterized in that it has a rearwardly inclined shape that extends diagonally upward on the rear side of the vehicle and reaches the upper end of the side wall portion.

According to such a configuration, the following effects can be obtained.
First, when a front collision of the vehicle occurs and a large load is input to the side member from the front side of the vehicle, originally, among the side members, the rear end of the superposition joint (the side member component on the front side). Although local bending deformation is likely to occur at the position of the rear end), according to the present invention, it is possible to cause bending deformation at the position of the superposition joint and / or the front end thereof. As a result, it is possible to eliminate the large local bending deformation of the side member only at the position of the rear end of the overlapped joint, and to cause a gentle bending deformation in a wide range of the side member. As a result, the load transmissibility of the side member can be improved, the impact absorption performance of the vehicle can be improved, the vehicle body strength can be increased, and the impact resistance performance (load resistance performance) can be enhanced.
Secondly, in the present invention, a rigid break point is provided in the overlapped joint portion, and this rigid break point can be provided, for example, by forming a bead portion described in the embodiment described later. is there. Therefore, it is not necessary to separately use a heavy reinforcing member or the like, and it is possible to appropriately reduce the weight of the vehicle and the manufacturing cost.

Other features and advantages of the present invention will become more apparent from the following description of embodiments of the invention with reference to the accompanying drawings.

(A) is a side view of a partial cross-sectional main part schematically showing an example of a vehicle structure according to the present invention, and (b) is a schematic bottom view of (a). (A) is an enlarged side view of a partial cross-sectional main part of FIG. 1 (a), (b) is a sectional view of IIb-IIb of (a), and (c) is IIc-IIc-of (a). It is a cross-sectional view of IIc, and FIG. 2D is a cross-sectional view taken along the line IId-IId of FIG. It is a schematic exploded perspective view of the main part of the structure shown in FIG. It is an operation explanatory view of the structure shown in FIG. 2 (a). It is sectional drawing of the main part which shows the other example of this invention. (A) is a schematic side view of a main part showing an example of the prior art, and (b) is a sectional view taken along line VIb-VIb of (a). It is an operation explanatory view of FIG.

Hereinafter, preferred embodiments of the present invention will be specifically described with reference to the drawings.
For ease of understanding, the same reference numerals as those of the prior art are appropriately used for the elements that are the same as or similar to those of the prior art shown in FIGS. 6 and 7.

The vehicle structure A shown in FIG. 1 includes a pair of left and right side members 3 (with halftone dot patterns in FIG. 1) arranged at the lower part of the vehicle 1, a floor portion 2 of the vehicle interior 10, and the like. It is equipped with the parts described later. Reference numerals 9a and 9b indicate front wheels and rear wheels, respectively.

The pair of side members 3 are arranged at intervals in the vehicle width direction and extend in the vehicle front-rear direction. These front portions 3a are located on both the left and right sides of the engine room 11, and are used for mounting a power plant 4 such as an engine. The area rearward of the vehicle from the front portion 3a is the floor portion 2 of the passenger compartment 10. It extends to the rear part of the vehicle 1 in a state of being joined to the lower surface side. Of the floor portions 2, the front floor portion 2a is configured by joining the front floor panel 21 to the lower rear end portion of the dash panel 20.

Each side member 3 is provided with a superposition joint portion 32 of two side member constituent members 30 and 31 on the front side and the rear side on the lower surface side of the front floor portion 2a. The front side member component 30 is a member extending from the overlapping joint portion 32 to the front side of the vehicle, and its specific length in the front-rear direction and a specific position of the front end are not limited. The rear side member component 31 is similar to this, and is a member extending from the overlapping joint portion 32 to the rear side of the vehicle, and its specific length in the front-rear direction, specific position of the rear end, and the like are not limited. Absent.

As is well shown in FIG. 3, the front side and rear side member constituent members 30 and 31 are, for example, both cross-section hat-shaped members, and the front side member constituent members 30 are the bottom wall portion 30a and both side wall portions. It has a 30b and a flange portion 30c, and the rear side member component 31 has a bottom wall portion 31a, both side wall portions 31b, and a flange portion 31c. However, the front side member constituent member 30 is larger in size and more rigid than the rear side member constituent member 31.

As is well shown in FIG. 2, in the overlapped joint portion 32, the rear side region 30R of the front side member component 30 is located outside the front region 31F of the rear side member component 31. As described above, these are the parts where these are fitted and overlapped, and welded (joined) such as spot welding is performed. The rear end of the front side member component 30 corresponds to the rear end 32r of the lap joint 32, and the front end of the rear side member component 31 corresponds to the front end 32f of the lap joint 32. ..

Of the rear side region 30R (region corresponding to the overlapped joint portion 32) of the front side member component 30, for example, two bead portions 34 are formed side by side in the vehicle front-rear direction in each of the side wall portions 30b. ing. The rigidity of each part of the overlapped joint portion 32 changes suddenly at the part where the bead portion 34 is provided. Therefore, the formed portion of the bead portion 34 (strictly speaking, the boundary portion between the bead portion 34 and the non-bead portion) is a rigidity breaking point R. Each bead portion 34 is a convex bead in which a part of the side wall portion 30b partially bulges toward the outer side of the side wall portion 30b, and has an appropriate angle diagonally downward and forward from the upper end of the side wall portion 30b. It extends in a slanted state at α. Since the portion where each bead portion 34 is formed is a portion where the shape (rigidity) of the overlapping joint portion 32 is suddenly changed in the vehicle front-rear direction, it corresponds to a rigidity break point R, and this rigidity break point R is As will be described later, at the time of the front collision of the vehicle 1, bending deformation occurs at the positions of the overlapping joint portion 32 and / or the front end 32f thereof.

Next, the operation of the vehicle structure A described above will be described.

First, in FIG. 2A, considering the structure of the superposition joint portion 32 of the side member 3 and its peripheral portion, the front end 32f and the rear end 32r of the superposition joint portion 32 have a rigidity breaking point R in which the rigidity suddenly changes. Corresponds to. When a large load is input to the side member 3 from the front side of the vehicle, the position of the rear end 32r of the superposition joint 32 is essentially the place where stress is most likely to be concentrated and bending deformation is likely to occur. The front end 32f of the superposition joint 32 is a portion where bending deformation is likely to occur next.

On the other hand, in the present embodiment, since the bead portion 34 is formed in the overlapped joint portion 32 and the rigidity breaking point R is provided, the bead portion 34 is not formed in the overlapped joint portion 32. Compared with the conventional configuration, bending deformation is likely to occur. As a result, stress concentration can be prevented from occurring at the position of the rear end 32r of the lap joint 32, bending deformation of the front end 32f of the lap joint 32, and bead portion 34 of the lap joint 32. The action of inducing bending deformation at the place where is formed is obtained.

For this reason, when a front collision of the vehicle 1 occurs and a large load input of a predetermined value or more is applied to the side member 3 from the front thereof, the side members 3 are overlapped as schematically shown in FIG. Bending deformation occurs not only at the position of the rear end 32r of the mating joint 32 but also at the position of the front end 32f. Further, although not shown in the figure, the overlapped joint portion 32 itself can also be bent and deformed starting from the rigidity breaking point R of the formed portion of the bead portion 34.
Since the bead portion 34 is provided in the inclined shape as described above, the direction of the stress generated in the overlapped joint portion 32 is set closer to the front end 32f of the overlapped joint portion 32, and the bending deformation at the position of the front end 32f is determined. The action of making it more likely to occur can also be obtained.

As described above, in the present embodiment, it is possible to set the portion where the bending deformation of the side member 3 occurs in a wide range region and prevent the large local bending deformation as shown in FIG. 7 from occurring.
Therefore, the load transmissibility of the side member 3 can be improved, and the shock absorption performance of the vehicle 1 can be improved. In addition, the strength of the vehicle body can be increased and the impact resistance (load bearing performance) can be improved.
Such an effect can be obtained by providing the bead portion 34 on the side member 3, and since it is not necessary to provide a reinforcing member on the side member 3, it is possible to appropriately reduce the weight of the vehicle 1 and the manufacturing cost. It is possible.

As shown in FIG. 1B, the pair of side members 3 in the present embodiment has a width in which the mutual spacing in the vehicle width direction increases toward the rear side of the vehicle and toward the rear side of the vehicle with respect to the overlapping joint portion 32. An enlarged portion 37 is provided, and the front portion of the widened portion 37 is a bent portion 38. Therefore, when a large load is input from the front side of the vehicle due to the front collision of the vehicle 1, each side member 3 may be bent and deformed starting from the bent portion 38, but the front side of the vehicle Since the overlapping joint portion 32 having the bead portion 34 is provided in the vicinity, the effect of suppressing the bending deformation starting from the bent portion 38 can be expected.

FIG. 5 shows another embodiment of the present invention. Elements that are the same as or similar to those of the embodiment are designated by the same reference numerals as those of the embodiments, and duplicate description thereof will be omitted.
In the embodiment shown in FIG. 5, a bead portion 35 is provided on the rear side member constituent member 31, and the bead portion 35 is a concave portion inside the bead portion 34 of the front side member constituent member 30. Is entering. According to such a configuration, since the bead portions 34 and 35 are provided in double, the difference in rigidity (strength difference) between the portion where these portions are formed and the peripheral portion thereof is made larger, and these are provided. It is possible to make the formed portion a portion where bending deformation is more likely to occur at the time of a front collision of the vehicle 1.

The present invention is not limited to the contents of the above-described embodiments. The specific configuration of each part of the vehicle structure according to the present invention can be variously redesigned within the scope intended by the present invention.

In the above-described embodiment, as a means for providing the rigidity breaking point R in the rear side region 30R of the front side member component 30, an inclined bead is formed on both side wall portions 30b of the front side member component 30. Although a plurality of parts 34 are provided, the present invention is not limited to this. The bead portion 34 may be singular, and the specific number thereof is not limited. The configuration may be provided only on one of the side wall portions 30b of the front side member constituent member 30. Further, the bead portion 34 may be in a form of bulging inward of the side wall portion 30b instead of the form of bulging outward of the side wall portion 30b (however, the side member constituent member on the rear side). It is necessary to provide it so that it does not interfere with 31) .

Overlapping joint 32, as opposed to the embodiment described above, so that the rear near region 30R of the front side member constituting member 30 is located inside the front near region 31F of the side member constituting member 31 on the rear side It may be superimposed on.
The front side and rear side member constituent members 30 and 31 may be members other than the cross-section hat-shaped members.

A Vehicle structure R Rigidity break point 1 Vehicle 2a Front floor part 3 Side member 30 Front side member component 30R Rear side area (of front side member component)
31 Rear side member component 31F Front area (of rear side member component)
32 Overlapping joint 32f Front end (of the overlaid joint)
32r rear end (of overlapping joints)
34 bead part

Claims (1)

It is arranged at intervals in the vehicle width direction and has a pair of left and right side members extending in the front-rear direction of the vehicle.
In each of the side members, on the lower surface side of the front floor portion of the vehicle interior, the front side region of the rear side member component and the rear side region of the front side member component having higher rigidity are mutually arranged. A vehicle structure comprising a superposed joint that is superposed and joined.
When a predetermined or greater compressive load is applied from the front side of the vehicle to the rear side region of the front side member constituent member, bending deformation may occur at the superposition joint and / or the front end position thereof. A bead in which a part of the side wall portion that stands up in the vertical height direction of the rearward side region partially bulges outward or inward in the vehicle width direction as a portion that constitutes a possible rigidity break point. There is a part,
In the side view of the vehicle, the bead portion extends diagonally upward on the rear side of the vehicle from a position separated from the lower end of the side wall portion in the region near the lower front side of the overlapped joint portion to reach the upper end of the side wall portion. A vehicle structure characterized by an upward slope after reaching.

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