JP7048192B2 - Vehicle structure - Google Patents

Description

The present invention relates to a vehicle structure such as an automobile.

As a vehicle structure of this type, there is a vehicle structure including a pair of left and right side members as a skeleton member of a vehicle body (see, for example, Patent Document 1). The pair of side members are spaced apart in the vehicle width direction at the bottom of the vehicle and extend from the front to the rear of the vehicle.

In such a structure, among the pair of side members, the mutual spacing in the vehicle width direction is slightly narrowed around the mounting location of the front suspension, and then the mutual spacing in the vehicle width direction gradually decreases toward the rear side of the vehicle. It is often adopted that a widening inclined portion is continuously provided, and the rear portion of the side member is connected to the rear end of the widening inclined portion via the first bent portion that is bent in the bottom view. Will be done. According to such a configuration, the rear portion of the side member can be arranged on the outer side in the vehicle width direction of the vehicle, and the vehicle body rigidity of the rear portion of the vehicle can be effectively increased.
On the other hand, the middle portion and the rear portion of the pair of side members in the vehicle front-rear direction are arranged on the lower side of the floor portion of the vehicle, and a second bent portion bent in a side view is a front end portion in these portions. A rear rising inclined portion formed on the surface is provided. According to such a configuration, it is possible to raise the rear portion of the side member so that it is suitable for mounting a component member of the rear suspension, for example.

However, in the above-mentioned prior art, there is still room for improvement as described below.
That is, each of the above-mentioned first and second bent portions of the side member tends to be a rigid break point, and when a collision such as a front collision or a rear collision of the vehicle occurs and a collision load is input to the side member. Is likely to cause bending deformation in the side member, starting from each of the first and second bent portions. If such bending deformation occurs, the load-bearing performance of the side members may be lowered, and the vehicle body strength against a vehicle collision may also be lowered. In addition to the poor transmission of the collision load, it is also difficult to properly control the bending deformation of the side members so that the collision energy is properly absorbed by the side members, so it is difficult to improve the impact absorption performance. Become.
As a means for preventing such a defect, it is conceivable to thicken the vicinity of each of the first and second bent portions, or to reinforce them by using a reinforcing member, for example. However, if the above-mentioned means is adopted for each of the first and second bent portions, the productivity deteriorates and the manufacturing cost becomes high. Also, the weight of the vehicle will increase.

Japanese Unexamined Patent Publication No. 2013-63758

The present invention has been conceived under the above-mentioned circumstances, and it is appropriate to improve the load bearing performance and impact absorption performance at the time of a vehicle collision while suppressing an increase in manufacturing cost and vehicle weight. The challenge is to provide a vehicle structure that can be achieved.

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

The vehicle structure provided by the present invention comprises a pair of left and right side members located at the bottom of the vehicle at intervals in the vehicle width direction and extending from the front to the rear of the vehicle, these pairs of sides. The members are a widening inclined portion in which the mutual distance in the vehicle width direction becomes wider from an intermediate position in the front-rear direction of the vehicle to the rear side of the vehicle, and a first bending portion bent in the bottom view is formed at the rear end portion, and this widening. A rear portion connected to the vehicle rear side of the inclined portion via the first bent portion and a second bent portion bent in a rearward upward shape in a side view are formed at the front end portion, and the second bent portion is formed. It is a vehicle structure having a rear-upward inclined portion that is inclined backwardly with a starting point, and each of the outer surface and the inner side surface of the first bent portion in the vehicle width direction is described above. The first and second bent portions are curved surfaces having a curved bottom surface that smoothly connects the outer surfaces and the inner side surfaces of the widened inclined portion near the rear end and the portion near the front end of the rear portion. It is characterized in that at least a part of these first and second bent portions are formed at the same position so as to have a positional relationship in which they overlap each other in the front-rear direction of the vehicle .

With such a configuration, the following effects can be obtained.
That is, since the first and second bent portions of the side member are collectively formed at the same location, the first and second bent portions are individually provided at locations separated from each other. Compared with the prior art, the number of bent portions that can be rigid break points at the time of a vehicle collision is reduced. Therefore, it is possible to prevent the side members from being unreasonably bent and deformed at the time of a collision such as a front collision or a rear collision of the vehicle, to increase the strength of the vehicle body, and to improve the load resistance (impact resistance). In addition, the load transferability of the side member is improved, and the absorption performance of the collision energy due to the bending deformation of the side member can be easily controlled, so that the impact absorption performance can be improved.
On the other hand, in the present invention, as described above, the strength of the side members can be improved by consolidating the first and second bent portions at the same location. Further, if the first and second bent portions are thickened or reinforced by using a reinforcing member, it is sufficient to substantially reinforce one portion. Unlike the prior art, it is not necessary to individually thicken each of the first and second bent portions or to reinforce them by using separate reinforcing members. Therefore, according to the present invention, it is possible to simplify the configuration of the side member, reduce the manufacturing cost, and appropriately reduce the weight of the vehicle.
Further, according to the present invention, since the strength of the side member is improved, the effect of improving the maneuverability of the vehicle can be obtained.

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

(A) is a schematic side view showing an example of a vehicle structure according to the present invention, and (b) is a schematic bottom view of (a). (A) is a cross-sectional view taken along the line IIa-IIa of FIG. 1 (b), and FIG. 1 (b) is a cross-sectional view taken along the line IIb-IIb of FIG. 1 (a). FIG. 3 is a cross-sectional view taken along the line III-III of FIG. 1 (b). It is an enlarged sectional view of the IV part of FIG. 1 (a).

Hereinafter, preferred embodiments of the present invention will be specifically described with reference to the drawings.

The vehicle structure A shown in FIG. 1 is composed of a pair of left and right side members 3 (with a halftone dot pattern in FIG. 1) arranged at the lower part of the vehicle 1, a rear portion of the dash panel 11a, and a floor panel 11b. The floor portion 11 and the first to third cross members 6a to 6c are provided.

The pair of side members 3 are arranged so as to be spaced apart from each other in the vehicle width direction, and extend in a series from the front portion to the rear portion of the vehicle 1. As shown in FIG. 2A, each side member 3 is configured by using a member having a cross-sectional hat shape, for example, and in a place where the floor portion 11 of the vehicle 1 is provided, the floor portion 11 is provided. It is welded to the lower surface of the.

As shown in the bottom view of FIG. 1B, the pair of side members 3 have a front portion 32, an inwardly inclined portion 33, a straight portion 34, a widened inclined portion 35, and a rear portion 36. The boundary portion between the rear end portion of the widened inclined portion 35 and the front end portion of the rear portion 36 is the first bent portion B1.
Further, as shown in the side view of FIG. 1A, the pair of side members 3 have a rear-down inclined portion 37, a substantially horizontal intermediate horizontal portion 38, and a rear-up inclined portion 39. The boundary portion between the rear end portion of the intermediate horizontal portion 38 and the front end portion of the rear rising inclined portion 39 is a second bent portion B2.

The front portion 32 is a portion located on the side portion of the engine room 10 in which the power plant 2 composed of an engine, a transmission, and the like is arranged, and extends substantially linearly in the front-rear direction of the vehicle.
The inward inclined portion 33 is a portion that is connected to the rear end of the front portion 32 and is inclined when viewed from the bottom surface so that the mutual distance in the vehicle width direction becomes narrower toward the rear side of the vehicle. A front suspension member (also referred to as a subframe) (also referred to as a subframe), which is not shown, is attached in the vicinity of the lower part of the inward inclined portion 33 to suspend the front wheel 19a. The inwardly inclined portion 33 is suitable for mounting such a front suspension member.

The straight portion 34 is provided so as to be connected to the rear end portion of the inward inclined portion 33, and is a portion that extends substantially linearly in the front-rear direction of the vehicle in the front-rear direction of the vehicle. The straight portion 34 extends from the rear end portion of the inward inclined portion 33 to a position between the first and second cross members 6a and 6b.

The first cross member 6a is bridged and connected between the floor tunnel portion 12 provided in the floor portion 11 and the rocker 15 provided in the lower portion of the outer end in the vehicle width direction of the vehicle 1 and is connected to each other. As shown in b), for example, a member having a hat-shaped cross section is used. The lower portion of the first cross member 6a is welded to the upper surface portion of the floor portion 11. The second cross member 6b is provided in a position separated from the first cross member 6a on the rear side of the vehicle, but its configuration is the same as that of the first cross member 6a. At the location where the straight portion 34 and the first cross member 6a overlap, both of them are welded to each other (spot welding or the like) with the floor portion 11 interposed therebetween. In the figure, reference numeral 51 indicates a reinforcing member for reinforcing the base portion of the floor tunnel portion 12.

The widening inclined portion 35 of the pair of side members 3 is provided so as to be connected to the rear end portion of the straight portion 34, and is an inclined portion in the bottom view so that the mutual distance in the vehicle width direction becomes wider toward the rear side of the vehicle. .. In the bottom view, the widening inclined portion 35 and the second cross member 6b intersect with each other, and a part of them overlaps with each other. In this overlapping portion, the widening inclined portion 35 and the second cross member 6b are welded to each other (spot welding or the like) with the floor portion 11 interposed therebetween. Preferably, of the straight portion 34 and the widening inclined portion 35, the portions to be welded to the first and second cross members 6a and 6b are partially widened.

The boundary portion between the rear end portion of the straight portion 34 and the front end portion of the widening inclined portion 35 is a third bent portion B3. Since the third bent portion B3 is located between the first and second cross members 6a and 6b, as will be described later, bending deformation is less likely to occur when the vehicle 1 collides.
Further, the boundary portion between the front end portion of the straight portion 34 and the rear end portion of the inward inclined portion 33 is a fourth bent portion B4, and the fourth bent portion B4 torques the rocker 15. It is reinforced by being connected via a box 16.

The rear portions 36 of the pair of side members 3 are connected to the rear end portions of the widening inclined portions 35 via the first bent portion B1, and the distance between the rear portions of the vehicle is gradually narrowed toward the rear side of the vehicle. It has an entrance inclined portion 36a and a rear straight portion 36b connected to the rear end portion and extending in a substantially non-inclined and substantially linear direction in the vehicle front-rear direction.
Of the side members 3, the formed portion of the first bent portion B1 is located on the outermost side in the vehicle width direction. In this first bent portion B1, each side is as shown in FIG. The side wall portion 3a on the outer side in the vehicle width direction of the member 3 is in contact with the inner side wall portion of the rocker 15 and is welded. This is preferable in increasing the strength of the first bent portion B1.

In FIG. 1A, the rearwardly rising inclined portion 39 is inclined backwardly upward in a side view, and is connected to the rear end portion of the intermediate horizontal portion 38 via a second bent portion B2. By providing the rear rising inclined portion 39, the height of the rear portion 36 is increased, and the components of the rear suspension (not shown) for suspending the rear wheel 19b are suitable for attaching to the rear portion 36. Benefits such as gain can be obtained.

The first and second bent portions B1 and B2 are formed at the same position in the side member 3. Specifically, the center line CL2 of the second bent portion B2 shown in FIG. 1A and the center line CL1 of the first bent portion B1 shown in FIG. 1B substantially coincide with each other. The above-mentioned "formed at the same location" preferably has a configuration in which the center lines CL1 and CL2 of the first and second bent portions B1 and B2 coincide with each other, but is not limited to this, and at least the first A part of the first and second bent portions B1 and B2 may be in a positional relationship in which they overlap each other in the front-rear direction of the vehicle.

As shown in FIG. 4, of the floor portions 11, a standing wall portion 11d is formed at the rear end of the front floor panel 11b'to provide a step portion 11c, and a step portion 11c is provided at the front portion of the cut portion 11c. , A third cross member 6c is provided (reference numeral 11b "indicates a rear floor panel). The third cross member 6c is bridged and connected between a pair of left and right rockers 15 in the vehicle width direction. Further, the third cross member 6c is arranged along the second bent portion B2, and the second bent portion B2 is preferably located below the third cross member 6c. However, in the front-rear direction of the vehicle, the third cross member 6c and the second bent portion B2 are provided so as to overlap each other.

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

First, the first and second bent portions B1 and B2 of the side member 3 are collectively formed at the same location as described above. Therefore, for example, as compared with the case where the first and second bent portions B1 and B2 are provided at separate locations separated from each other, the total number of rigidity break points is increased at the time of a collision such as a front collision or a rear collision of the vehicle 1. It is possible to reduce the number and make it difficult for the side member 3 to be unreasonably bent and deformed. Further, it is also easy to make the portions where the first and second bent portions B1 and B2 are formed to have the required rigidity. Therefore, while suppressing an increase in manufacturing cost and weight, the load resistance (impact resistance) of the side member 3 at the time of a collision of the vehicle 1 is improved, the transmission of the collision load is improved, and the side member 3 is used. It is also possible to facilitate the control of bending deformation and improve the impact absorption performance at the time of collision. As a result, the occupant protection performance can be improved.

Further, as described with reference to FIG. 3, since the formed portion of the first bent portion B1 (and the second bent portion B2) of the side member 3 is welded to the rocker 15, the rocker 15 is used. It is used and efficiently reinforced.
Further, as described with reference to FIG. 4, the second bent portion B2 (and the first bent portion B1) of the side member 3 is located below the third cross member 6c, and the third bent portion B2 is located below the third cross member 6c. It is also reinforced by the cross member 6c. Therefore, it is possible to appropriately prevent or suppress bending deformation of the first and second bent portions B1 and B2 when the vehicle 1 collides.

Of the side members 3, the third bent portion B3 is located between the first and second cross members 6a and 6b as described above, and is located on the vehicle front side portion of the third bent portion B3. The vehicle rear side portion is welded to the first and second cross members 6a and 6b via the floor portion 11. Therefore, it is also appropriately prevented that the side member 3 is easily bent and deformed at the position of the third bent portion B3. At the time of a front collision of the vehicle 1, a part of the collision load input to the side member 3 from the front side of the vehicle can be received by the first cross member 6a, so that the third bent portion B3 is bent and deformed. It is possible to prevent it more reliably.

As described above, according to the present embodiment, it is possible to reasonably increase the strength of the side member 3 without using a large number of special reinforcing members. Further, this can be expected to have the effect of improving the maneuverability 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 of the present invention.
In the above-described embodiment, in the bottom view, the rear inward inclined portion 36a is continuously provided at the rear end portion of the widened inclined portion 35 of the side member 3 via the first bent portion B1. Is not limited to this. At the rear end of the widened inclined portion 35, a portion formed so as to extend substantially linearly in the front-rear direction of the vehicle instead of the inclined portion 36a entering the rear (similar to the shape of the rear straight portion 36b). The portion) may be configured to be continuously provided via the first bent portion B1.

A Vehicle structure B1, B2 First and second bent portions 3 Side members 35 Widening inclined portion 39 Rear rising inclined portion

Claims (1)

It is located at the bottom of the vehicle at intervals in the vehicle width direction and has a pair of left and right side members extending from the front to the rear of the vehicle.
These pair of side members
A widening inclined portion in which the distance between the vehicle width directions becomes wider from the middle of the vehicle front-rear direction to the rear side of the vehicle, and the first bent portion bent in the bottom view is formed at the rear end portion.
A rear portion connected to the rear side of the widened inclined portion via the first bent portion, and a rear portion.
A second bent portion that is bent backward in a lateral view is formed at the front end portion, and a rear rising inclined portion that is inclined in a backward rising shape with the second bent portion as the starting end, and a rear rising inclined portion.
Has a vehicle structure,
Each of the outer surface and the inner surface of the first bent portion in the vehicle width direction smoothly connects the outer surfaces and the inner surfaces of the widened inclined portion near the rear end and the rear portion near the front end. It is a curved surface with a curved bottom view,
The first and second bent portions are characterized in that at least a part of the first and second bent portions are formed at the same position so as to have a positional relationship in which they overlap each other in the front-rear direction of the vehicle. Vehicle structure.

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