JP2020104645A - Vehicle body structure - Google Patents

Abstract

To provide a vehicle body structure that can prevent deformation of a floor panel and can easily reduce manufacturing costs and provide a light structure.SOLUTION: A body structure 10 includes: a floor panel 50 configuring at least a portion of a floor part of a vehicle body 1; a cross member 48 disposed under the vehicle body 1 and extending in the width direction to increase rigidity of the vehicle body 1; a front seat anchor 30 located forward of the cross member 48 of the vehicle body 1 to support a lower side of a front leg 26 of a seat 16; and a rear seat anchor 32 located rearward of the cross member 48 to support a lower side of a rear leg 28 of the seat 16. The floor panel 50 includes a bent portion 81 serving as a downward folded portion at an upper edge portion between the front seat anchor 30 and the rear seat anchor 32 in the longitudinal direction. The rear seat anchor 32 is fixed rearward of the bent portion of the front panel 50.SELECTED DRAWING: Figure 1

Description

The present invention relates to a vehicle body structure.

BACKGROUND ART Conventionally, there is a vehicle body described in Patent Document 1. This vehicle body includes a floor panel that constitutes at least a part of the floor portion, a cross member that extends below the floor panel in the width direction of the vehicle body to increase the strength of the vehicle body, and a cross member in the longitudinal direction of the vehicle body. The front and rear seat anchors are arranged at the front and rear and support the front and rear legs of the seat.

JP, 2006-290064, A

The floor panel may be significantly deformed when a large front load acts on the seat belt in the event of a vehicle collision.In order to avoid this deformation, increase the strength of the floor panel. Then, the plate thickness of the floor panel becomes large, and the manufacturing cost and weight increase.

Therefore, an object of the present invention is to provide a vehicle body structure capable of suppressing deformation of a floor panel, suppressing manufacturing costs, and easily realizing a lightweight structure.

In order to solve the above problems, a vehicle body structure according to the present invention is a vehicle body structure included in a vehicle body, wherein a floor panel forming at least a part of a floor portion of the vehicle body, and a vehicle body structure below the vehicle body. A cross member that extends in the width direction to increase the strength of the vehicle body; a front seat anchor that is located on the front side in the front-rear direction of the vehicle body with respect to the cross member and supports the lower side of the front leg of the seat; A rear seat anchor that is located rearward of the cross member in the front-rear direction and supports a lower side of the rear leg of the seat, wherein the floor panel includes the front seat anchor and the rear seat in the front-rear direction. A bent portion that makes a valley fold is provided at an upper edge portion between the anchor and the anchor, and the rear seat anchor is fixed to the rear side of the bent portion of the floor panel. The vehicle body structure may be a structure included in the vehicle body, and may be a part of the vehicle body or the vehicle body itself.

Further, in a cross section including the height direction of the vehicle body and the front-rear direction of the vehicle body, a length of a front portion of the bent portion that is a boundary of the fold and a rear portion of the bent portion that is a boundary of the fold. It is preferable that the lengths of are substantially the same.

According to the vehicle body structure of the present invention, the floor panel has the bent portion that becomes a valley fold at the upper edge portion between the front seat anchor and the rear seat anchor, and the rear seat anchor is located behind the bent portion of the floor panel. Fixed to the side. Therefore, the bent portion that becomes a valley fold is bent so that the crossing angle becomes small at the time of a vehicle collision or the like, so that the front force received by the seat belt can be absorbed by the bent portion via the rear seat anchor. it can. As a result, it is possible to suppress the force received by the seat belt from acting on the front side of the bent portion of the floor panel, and as a result, it is possible to suppress the deformation of the floor panel and improve the robustness of the vehicle body structure. Furthermore, by providing a bent portion that becomes a valley fold at the upper edge portion of the floor panel, it is possible to suppress the deformation of the floor panel, and it is not necessary to increase the plate thickness of the floor panel. Therefore, it is easy to reduce the manufacturing cost and realize a lightweight structure.

FIG. 3 is a side sectional view of a vehicle body rear portion according to the embodiment of the present invention. FIG. 4 is a plan view showing a skeleton structure on the lower side of the floor in the rear portion of the vehicle body. It is an expansion schematic cross section of the peripheral region of the 5th cross member in FIG. FIG. 3 is an enlarged schematic cross-sectional view of a bent portion included in the rear portion of the vehicle body in a cross section including a height direction of the vehicle body and a front-back direction of the vehicle body. It is an expansion schematic cross section of a peripheral region of the 5th cross member after modification.

Embodiments according to the present invention will be described below in detail with reference to the accompanying drawings. When a plurality of embodiments and modifications are included below, it is assumed from the beginning that a new embodiment is constructed by appropriately combining the characteristic parts. Further, in the following embodiments, the same reference numerals are given to the same components in the drawings, and duplicated description will be omitted. Further, a plurality of drawings include schematic drawings, and the dimensional ratios such as the length, the width, and the height of each member do not necessarily match between different drawings. Further, among the components described below, the components not described in the claims are arbitrary components and are not essential components. In the drawings, the X direction indicates the front-back direction of the vehicle body 1, the Y direction indicates the width direction of the vehicle body 1, and the Z direction indicates the height direction of the vehicle body 1. The X direction, the Y direction, and the Z direction are orthogonal to each other.

FIG. 1 is a side sectional view of a rear portion of a vehicle body 1 according to an embodiment of the present invention, and is a side sectional view of the rear portion of the vehicle body 1 in a state where a third row seat 16 can be used. As shown in FIG. 1, the vehicle body 1 includes a second-row seat 14 as a front seat and a third-row seat 16 as a rear seat. These seats 14 and 16 are arranged on the floor 12 of the vehicle body 1 in the front-rear direction. Are arranged side by side. A long slide rail 20, which is long in the front-rear direction, is fixed to the floor 12 of the vehicle body 1. The long slide rail 20 is capable of sliding the second row seat 14 with respect to the vehicle body 1 at a desired front and rear position via a slide rail upper 22 provided below a seat cushion 14A that constitutes the second row seat 14. It supports so that it can be stopped. The long slide rail 20 is longer than the front-rear length of the seat cushion 14A, and has, for example, a length in the front-rear direction that is about three times the front-rear length. Therefore, the second row seat 14 has a wide range of adjustable front and rear positions. The second row seat 14 also includes a seat belt device 24. As a result, the occupant seated on the second row seat 14 can be reliably restrained by the seat belt device 24 regardless of the front-back position of the second row seat 14.

As in the present embodiment, the storage space 18 that is a space that opens upward may be provided between the rear end of the long slide rail 20 on the floor 12 and the rear bumper 25. The third-row seat 16 includes front legs 26 and rear legs 28. In a state where the third row seat 16 is usable, the upper ends of the front and rear legs 26, 28 support the lower part of the seat cushion 16A on the upper side. On the other hand, in the state where the third row seat 16 is usable, the lower end portion of the front leg 26 is supported by the front seat anchor 30 protruding from the floor 12, and the lower end portion of the rear leg 28 is separated from the floor 12. It is supported by the seat anchor 32 after being projected.

FIG. 2 is a plan view showing a skeleton structure on the lower side of the floor 12 in the rear portion of the vehicle body 1. As shown in FIG. 2, the vehicle body structure 10 located below the vehicle body 1 includes a pair of left and right side members 38 extending substantially parallel to the front-rear direction. Each side member 38 may have a taper portion in which a space between the side members 38 is widened at a rear portion where the storage space 18 is arranged. Further, the vehicle body structure 10 includes a plurality of cross members 40, 42, 44, 46, 48 which are arranged at intervals in the front-rear direction and extend substantially parallel to the width direction of the vehicle body 1. The left and right side members 38 are connected by a plurality of cross members 40, 42, 44, 46, 48, and as a result, the rigidity and strength of the vehicle body 1 are increased.

As shown in FIGS. 1 and 2, first to fifth cross members 40, 42, 44, 46, 48 may be arranged in the rear portion of the vehicle body 1 in order from the front. Further, as shown in FIG. 1, each of the first to fourth cross members 40, 42, 44, 46 may be formed in a hat shape that opens upward, and a flange 40A that spreads along the opening edge, It may have 42A, 44A, 46A. Further, by fixing the flanges 40A, 42A, 44A, 46A to the lower surface of the floor panel 50 in a state of being in close contact with each other, each of the first to fourth cross members 40, 42, 44, 46 is fixed to the floor panel 50. May be. On the other hand, the fifth cross member 48 is formed in a substantially L shape in side view. The fifth cross member 48 has a flange 48A extending from the upper front end and the lower rear end. For example, the flange 48A may be fixed in a state in which the flange 48A is in close contact with a portion of the floor panel 50 along the horizontal surface and a portion of the storage space 18 that constitutes the front wall portion 18A. May be fixed to the floor panel 50.

Although not described in detail, as shown in FIG. 2, the long slide rails 20 may be provided, for example, for the right-side second row seat 14 in a pair of left and right side by side, and for the left-side second row seat 14. Alternatively, the right and left pairs may be provided in parallel. The long slide rail 20A on the outer side in the width direction indicated by an imaginary line in FIG. 2 is mainly disposed on the side member 38 and is fastened to a closed cross section formed by the side member 38 and the floor panel 50. On the other hand, the long slide rail 20B on the inner side in the width direction may extend in the front-rear direction from the rear portion of the first cross member 40 onto the fourth cross member 46. Further, the front end of the long slide rail 20B may be fixed to a closed cross section formed by the floor panel 50 and the first cross member 40 via a mounting member (not shown). Further, the middle portion of the long slide rail 20B may be fastened and fixed to the closed cross-section portion formed by the floor panel 50 and the second and third cross members 42, 44 by a bolt/nut (weld nut) not shown. Good.

FIG. 3 is an enlarged schematic sectional view of a peripheral region of the fifth cross member 48 in FIG. As shown in FIG. 3, the front seat anchor 30 is located on the front side of the fifth cross member 48, and the rear seat anchor 32 is located on the rear side of the fifth cross member 48. Further, the floor panel 50 has a bent portion 81 that is a valley fold at an upper edge portion 80 between the front seat anchor 30 and the rear seat anchor 32 in the front-rear direction. Further, the rear seat anchor 32 is fixed to the rear side of the bent portion 81 of the floor panel 50 by fixing means such as welding, fixing with an adhesive, or a fastening member. As shown in FIG. 4, that is, an enlarged schematic cross-sectional view of the bent portion 81, in the present embodiment, the length a of the sectional line length of the front portion 83 of the bent portion 81 at the boundary of the fold 82 and the bent portion 81. The length b of the cross-sectional line length of the rear side portion 84 with the fold 82 as a boundary is substantially the same. Note that, here, the substantially same conditions are used for the floor panel 50 with the intention that the length a of the sectional line length of the front side portion 83 and the length b of the sectional line length of the rear side portion 84 are the same. When created, the difference between the sectional line length a of the front side portion 83 and the sectional line length b of the rear side portion 84 is satisfied when the difference is within the range of the tolerance (design error). I shall.

As described above, the vehicle body structure 10 of the present disclosure includes the floor panel 50 that is included in the vehicle body 1 and constitutes at least a part of the floor portion of the vehicle body, and extends in the width direction of the vehicle body 1 below the vehicle body 1 by A cross member (fifth cross member 48) for increasing the strength of No. 1 is provided. The vehicle body structure 10 is located on the front side in the front-rear direction of the vehicle body 1 with respect to the fifth cross member 48, and supports the lower side of the front leg 26 of the seat (third row seat 16) and the front seat anchor 30. A rear seat anchor 32 that is located rearward of the cross member 48 in the front-rear direction and supports the lower side of the rear leg 28 of the third row seat 16 is provided. Further, the floor panel 50 has a bent portion 81 that is a valley fold at the upper edge portion 80 between the front seat anchor 30 and the rear seat anchor 32 in the front-rear direction, and the rear seat anchor 32 bends in the floor panel 50. It is fixed to the rear side of the portion 81.

Therefore, the bent portion 81 that becomes a valley fold is bent so that the crossing angle becomes small at the time of a vehicle collision or the like, so that the front side force received by the seat belt is absorbed by the bent portion 81 via the rear seat anchor 32. can do. Therefore, the force received by the seat belt can be suppressed from acting on the front side of the bent portion 81 of the floor panel 50, so that the deformation of the floor panel 50 can be suppressed and the robustness of the vehicle body structure 10 can be improved.

In addition, the present inventor has found from the test that the joint spot 87 (see FIG. 3) between the floor panel 50 and the cross member 48 is easily broken when a shock is applied to the floor panel 50 in the front-rear direction. It was also confirmed by the allowable load test on the test piece that the load resistance performance of the shear load was higher than the load resistance performance of the peeling load at the joining spot 87.

In such a background, when the bent portion 81 is bent so that the crossing angle becomes small at the time of a vehicle collision or the like, as shown in FIG. 5, that is, an enlarged schematic cross-sectional view of the peripheral region of the deformed fifth cross member 48. In addition, the extending direction of the lower end portion of the rear sheet anchor 32 and the extending direction of the joining spot 87 easily coincide with each other in the same direction (the direction indicated by the arrow B in FIG. 5), and the shear load is applied to the joining spot 87. It becomes easy to work. Therefore, according to the vehicle body structure 10, the impact resistance performance can be improved, and the vehicle body structure 10 having higher safety can be realized.

Further, according to the vehicle body structure 10, since the floor panel 50 can be prevented from being deformed by providing the bent portion 81 that is a valley fold on the upper edge portion 80 of the floor panel 50, it is possible to reduce the thickness of the floor panel 50. It doesn't have to be big. Therefore, it is easy to reduce the manufacturing cost of the vehicle body structure 10 and realize a lightweight structure.

In addition, the length a of the sectional line length of the front portion 83 of the bent portion 81 at the boundary of the fold 82 and the length b of the sectional line length of the rear portion 84 of the bent portion 81 at the boundary of the fold 82 are It is preferable that they are substantially the same.

According to this configuration, since the sectional line length length a of the front side portion 83 and the sectional line length length b of the rear side portion 84 are substantially the same, the structure of the bent portion 81 is similar to that of the pantograph. It becomes the structure of. Therefore, since the bent portion 81 is easily deformed when an impact is applied, the shear load is more likely to act on the joining spot 87. Therefore, the impact resistance performance of the vehicle body structure 10 can be further enhanced.

It should be noted that the present invention is not limited to the above-described embodiments and modifications thereof, and various improvements and changes can be made in the matters described in the claims of the present application and equivalent ranges thereof.

For example, in the above-described embodiment, the length a of the front portion 83 of the bent portion 81 with the fold 82 as a boundary and the length b of the rear portion 84 of the bent portion 81 with the fold 82 as a boundary are substantially the same. I explained about the case. However, the length of the front portion of the bent portion that is the boundary of the fold and the length of the rear portion of the bent portion that is the boundary of the fold may have a difference in length that exceeds the tolerance.

Also, the case where five cross members 40, 42, 44, 46, 48 are present in the rear portion of the vehicle body has been described, but four or less cross members may be present in the rear portion of the vehicle body, and six or more cross members may be present. May exist. At least one cross member may be present in the vehicle body structure.

In addition, the case where the seat supported by the front seat anchor 30 and the rear seat anchor 32 is the third-row seat 16 is configured such that the bent portion 81 is located between the front and rear directions. However, the vehicle may have any number of rows of seats arranged in the front-rear direction, and the seats supported by the front seat anchor and the rear seat anchor arranged such that the bent portions are located in the front-rear direction are Any number of rows can be used.

DESCRIPTION OF SYMBOLS 1 vehicle body, 10 vehicle body structure, 16 3rd row seat (seat corresponding to the seat of claim 1), 26 front legs, 28 rear legs, 30 front seat anchors, 32 rear seat anchors, 48 5th cross member (claim 1 Cross member corresponding to the cross member), 50 floor panel, 80 upper edge portion, 81 bent portion, X direction vehicle front-rear direction, Y direction vehicle body width direction.

Claims (1)

A vehicle body structure included in the vehicle body,
A floor panel forming at least a part of the floor portion of the vehicle body;
A cross member that increases the strength of the vehicle body by extending in the width direction of the vehicle body on the lower side of the vehicle body;
A front seat anchor that is located on the front side in the front-rear direction of the vehicle body with respect to the cross member and supports the lower side of the front leg of the seat;
A rear seat anchor that is located on the rear side in the front-rear direction with respect to the cross member and supports the lower side of the rear leg of the seat,
The floor panel has a bent portion that becomes a valley fold at an upper edge portion between the front seat anchor and the rear seat anchor in the front-rear direction,
A vehicle body structure in which the rear seat anchor is fixed to the rear side of the bent portion of the floor panel.

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