JP2020097351A - Vehicle structure - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a vehicle structure capable of appropriately improving load resistance performance and shock absorption performance at the time of collision of a vehicle while suppressing an increase in manufacturing cost and vehicle weight. SOLUTION: A pair of side members 3 has a first bent portion B1 formed in a rear end portion in which a mutual interval in a vehicle width direction becomes wider from a midway position in a vehicle front-rear direction toward a vehicle rear side and bent in a bottom view. And a rearward-increasing inclined portion 39 having a second curved portion B2 that is inclined rearwardly upward and is curved in a side view and is formed at the front end portion. In the vehicle structure A, the first and second bent portions B1 and B2 are formed at the same location. [Selection diagram]

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 (for example, refer to Patent Document 1). The pair of side members are arranged at a lower portion of the vehicle at intervals in the vehicle width direction and extend from the front portion to the rear portion of the vehicle.

In such a structure, among the pair of side members, the vehicle width direction mutual spacing is slightly narrowed around the front suspension mounting location, and the vehicle widthwise mutual spacing is gradually increased toward the rear of the vehicle. A configuration is often adopted in which a widened inclined portion that increases in size is continuously provided, and a rear portion of the side member is connected to the rear end of the widened inclined portion through a first bent portion that is bent in bottom view. To be done. According to such a configuration, the rear portion of the side member is arranged on the outer side in the vehicle width direction of the vehicle, and the vehicle rigidity of the vehicle rear portion can be effectively increased.
On the other hand, the middle part and the rear part of the pair of side members in the vehicle front-rear direction are arranged below the floor part of the vehicle. In these parts, a second bent part bent in a side view is provided at the front end part. And a rear rising slope portion formed on the upper surface. With such a configuration, the rear portion of the side member can be made high, and it can be made suitable for mounting, for example, the constituent members of the rear suspension.

However, in the above-mentioned conventional technique, 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 is likely to become a rigid breakpoint, 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. Of the first and second bent portions are the starting points, and the side members are likely to be bent and deformed. If such a bending deformation occurs, the load-bearing performance of the side member may be reduced, and the vehicle body strength against a vehicle collision may be reduced. Further, the transmission of the collision load is deteriorated, and it is also difficult to appropriately control the bending deformation of the side member so that the collision energy is appropriately absorbed by the side member, which makes it difficult to improve the impact absorption performance. Become.
As a means for preventing such a problem, it is conceivable to increase the thickness of the vicinity of each of the first and second bent portions, or to reinforce by using a reinforcing member. However, if the above-mentioned means is adopted for each of the first and second bent portions, the productivity is deteriorated and the manufacturing cost is increased. In addition, the vehicle weight also increases.

JP, 2013-63758, A

The present invention has been devised under the circumstances as described above, and appropriately suppresses an increase in manufacturing cost and vehicle weight, and appropriately improves load resistance performance and shock absorption performance during a vehicle collision. It is an object of the invention to provide a vehicle structure that can be achieved.

In order to solve the above problems, the present invention takes the following technical means.

The vehicle structure provided by the present invention includes a pair of left and right side members that are located at a lower portion of the vehicle at intervals in the vehicle width direction and that extend from a front portion to a rear portion of the vehicle. The member has a vehicle-width-wise mutual interval that increases from the midway position in the vehicle front-rear direction toward the vehicle rear side, and a widened inclined portion in which a first bent portion that is bent in a bottom view is formed at a rear end portion, and a rearward rising portion. And a rearward-increasing inclined portion having a second bent portion that is bent in a side view and is formed at a front end portion. The bent portions are characterized by being formed at the same location.

With such a configuration, the following effects can be obtained.
That is, since the above-described 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 bends that can become a rigidity breakpoint at the time of a vehicle collision is reduced. Therefore, by that amount, it is possible to prevent the side member from being unduly bent and deformed at the time of a collision such as a front collision or a rear collision of the vehicle, to enhance the strength of the vehicle body, and to improve load resistance (impact resistance). Further, the load transmissibility of the side member is improved, and the impact energy absorption performance due to the bending deformation of the side member is 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 member is improved by consolidating the first and second bent portions at the same location. Further, if the first and second bent portions are made thicker or are 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 each using a separate reinforcing member. From the above, according to the present invention, the structure of the side member can be simplified, the manufacturing cost can be reduced, and the vehicle weight can be appropriately reduced.
Further, according to the present invention, since the strength of the side member is improved, the effect of improving the steering stability of the vehicle can be obtained.

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

(A) is a schematic side view showing an example of a vehicle structure concerning the present invention, and (b) is a schematic bottom view of (a). (A) is a IIa-IIa sectional view of FIG. 1(b), and (b) is a IIb-IIb sectional view of (a). It is a III-III sectional view of FIG. It is an expanded sectional view of the IV section 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 includes a pair of left and right side members 3 (shown with a halftone dot pattern in FIG. 1) arranged in a lower portion of the vehicle 1, a rear portion of a 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 at a distance from each other in the vehicle width direction, and extend in series from the front portion to the rear portion of the vehicle 1. As shown in FIG. 2( a ), each side member 3 is configured using a member having a hat-shaped cross section, for example, and at the location where the floor portion 11 of the vehicle 1 is provided, the floor portion 11 is provided. Is welded to the lower surface of the.

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

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

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

The first cross member 6a is bridge-connected between the floor tunnel portion 12 provided on the floor portion 11 and the rocker 15 provided at the lower portion of the outer end of the vehicle 1 in the vehicle width direction, and the first cross member 6a is shown in FIG. 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 at a position further away from the first cross member 6a on the vehicle rear side than the first cross member 6a, but its configuration is similar to that of the first cross member 6a. At the location where the straight portion 34 and the first cross member 6a overlap, they are welded (spot welding or the like) to each other 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 widened slanted portions 35 of the pair of side members 3 are provided so as to be connected to the rear ends of the straight portions 34, and are slanted in a bottom view so that the vehicle width direction mutual spacing becomes wider toward the vehicle rear side. .. In a bottom view, the widening inclined portion 35 and the second cross member 6b intersect with each other, and these portions partially overlap each other. In the overlapping portion, the widening inclined portion 35 and the second cross member 6b are welded (spot welding or the like) to each other with the floor portion 11 interposed therebetween. Preferably, the portions of the straight portion 34 and the widening slope portion 35 that are welded to the first and second cross members 6a, 6b are partially wide.

A boundary portion between the rear end portion of the straight portion 34 and the front end portion of the widening slope 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, the third bent portion B3 is less likely to be bent and deformed when the vehicle 1 collides, as described later.
Further, the boundary portion between the front end portion of the straight portion 34 and the rear end portion of the inward entering inclined portion 33 is the fourth bent portion B4, and the fourth bent portion B4 causes the torque to the rocker 15. It is reinforced by being connected through the box 16.

The rear portions 36 of the pair of side members 3 are connected to the rear ends of the widening inclined portions 35 via the first bent portions B1, and the vehicle width direction mutual intervals gradually narrow toward the vehicle rear side. It has an inclining portion 36a and a rear straight portion 36b which is connected to the rear end portion thereof and extends in a substantially straight line in the vehicle front-rear direction without being inclined.
In each side member 3, the formation location of the first bent portion B1 is located on the outermost side in the vehicle width direction. However, in this first bent portion B1, as shown in FIG. The side wall portion 3a on the vehicle width direction outer side of the member 3 is in contact with and welded to the inner side wall portion of the rocker 15. This is preferable for increasing the strength of the first bent portion B1.

In FIG. 1A, the rearward rising inclined portion 39 is inclined rearwardly in a side view, and is connected to the rear end portion of the intermediate horizontal portion 38 via the second bent portion B2. By providing the rearwardly rising slanted portion 39, the height of the rear portion 36 is increased, and a component of a rear suspension (not shown) for suspending the rear wheel 19b is suitable for mounting on the rear portion 36. The advantages such as gaining can be obtained.

The first and second bent portions B1 and B2 are formed at the same position on 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 are substantially coincident with each other. The above-mentioned "formation at the same location" is preferably a configuration in which the respective center lines CL1 and CL2 of the first and second bent portions B1 and B2 coincide, but is not limited to this, and at least the first It suffices that a part of the first and second bent portions B1 and B2 have a positional relationship where they overlap each other in the vehicle front-rear direction.

As shown in FIG. 4, in the floor portion 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 front portion of the cut portion 11c is provided. , A third cross member 6c is provided (reference numeral 11b″ indicates a rear floor panel). The third cross member 6c is bridge-connected between the pair of left and right rockers 15 to extend in the vehicle width direction. The third cross member 6c is arranged along the second bent portion B2, and preferably, the second bent portion B2 is located below the third cross member 6c. However, in the vehicle front-rear direction, 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, as described above, the first and second bent portions B1 and B2 of the side member 3 are collectively formed at the same location. Therefore, for example, 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 rigid breakpoints at the time of a collision such as a front collision or a rear collision of the vehicle 1 is calculated. By reducing the number, it becomes possible to prevent the side member 3 from being unduly bent and deformed. Further, it becomes easy to provide the portion where the first and second bent portions B1 and B2 are formed with a required rigidity. For this reason, while suppressing an increase in manufacturing cost and an increase in weight, the load resistance (impact resistance) of the side member 3 at the time of a collision of the vehicle 1 is enhanced, the transmission of the collision load is improved, and the side member 3 is improved. It is also possible to improve the control of bending deformation and improve the shock absorbing performance at the time of collision. As a result, passenger protection performance can be improved.

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

As described above, the third bent portion B3 of the side member 3 is located between the first and second cross members 6a and 6b, and serves as a 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 possible to appropriately prevent the side member 3 from easily being bent and deformed at the position of the third bent portion B3. At the time of a frontal 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 bending portion B3 is bent and deformed. It is possible to prevent it more reliably.

As described above, according to this embodiment, it is possible to rationally increase the strength of the side member 3 without using a large number of special reinforcing members. In addition, this can also be expected to have the effect of improving the steerability of the vehicle 1.

The present invention is not limited to the contents of the above-mentioned embodiment. The specific configuration of each part of the vehicle structure according to the present invention can be modified in various ways within the scope intended by the present invention.
In the above-described embodiment, in the bottom view, the rear inwardly inclined portion 36a is continuously provided at the rear end of the widening 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 sloped portion 35, instead of the rear inward sloped portion 36a, a portion formed so as to extend in a substantially straight line in a substantially longitudinal direction in the vehicle front-rear direction (shape similar to the rear straight portion 36b). (Portion) may be continuously provided via the first bent portion B1.

A Vehicle structure B1, B2 1st and 2nd bending part 3 Side member 35 Widening slope part 39 Rear rising slope part

Claims (1)

Located at the lower portion of the vehicle at intervals in the vehicle width direction, and provided with a pair of left and right side members extending from the front portion to the rear portion of the vehicle,
These pair of side members are
A widened slanted portion in which the vehicle width direction mutual distance becomes wider from the midway position in the vehicle front-rear direction toward the vehicle rearward side, and a first bent portion bent in a bottom view is formed at a rear end portion,
A rearward-increasing inclined portion that is inclined rearwardly and has a second bent portion that is curved in a side view and is formed at the front end portion;
A vehicle structure having
The vehicle structure, wherein the first and second bent portions are formed at the same location.

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