JP3956573B2 - Body structure - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a vehicle body structure of a vehicle such as an automobile, and more particularly to a vehicle body structure suitable for use in a structure around a rear seat back.
[0002]
[Prior art]
Generally, in an automobile, a strength member member is provided along a vehicle body wall portion in order to ensure vehicle body rigidity. Hereinafter, a configuration around the rear seat back of an automobile will be described as an example of such a vehicle body structure with reference to FIGS.
As shown in FIGS. 4 (A) and 4 (B) around the rear seat back behind the vehicle body 1 surrounded by a two-dot chain line in FIG. 3, that is, behind the rear seat 1A as shown in FIG. 4 (B). The vehicle is placed on the lower surface of the floor panel 4 so as to be spanned between the floor panel 4 forming the vehicle body floor and the left and right side members 1B (see FIG. 4A) arranged along the vehicle longitudinal direction. A rear floor cross member (hereinafter also referred to simply as a cross member) 2 attached along the width direction, a seat back panel 6C forming a vehicle body side wall, and a vehicle body side wall (seat back panel 6C) on the upper surface of the floor panel 4 A cage (CAGE) structure is formed by the panel-like rear seat back brace (hereinafter also simply referred to as “brace”) 105 to be attached and the rear shelf panel 7 so as to surround the vehicle interior. To have. The cage structure ensures the vehicle body rigidity, and the brace 105 is spot-welded to the floor panel 4 at the position indicated by the mark ● in the drawing as shown in FIG. The cross member 2 is particularly designed to secure rigidity against a lateral force F input from a suspension of a rear wheel (not shown) as will be described later.
[0003]
The seat back panel 6C is installed between an inner panel 6A that forms the wall surface of the vehicle interior, and a wheel house inner 6B that is disposed below the inner panel 6A and forms a part of the wheel house. 6A and the wheel house inner 6B constitute an inner panel member 6 (vehicle body side wall).
The cross member 2 will be further described. As shown in FIG. 4B, the cross member 2 has a U-shaped cross section and is attached to the lower surface of the floor panel 4 with its opening facing upward. A closed section is formed together with the floor panel 4. Further, lean forces 3 are respectively attached to both end portions in the closed cross section extending in the vehicle width direction, and the lean forces 3 have a U-shaped cross section and have an opening portion directed downward. The upper surface 3A is spot-welded to the lower surface of the floor panel 4, and the lower surface (flange portion) 3B is spot-welded to the inner wall of the cross member 2, as indicated by x in FIG. 4B.
[0004]
Further, brackets 8A and 8B are spot-welded to both side end portions of the cross member 2 as indicated by X in FIG. 4B. As shown in FIGS. 4A and 4B, a toe control arm 8C is attached to the bracket 8A at an attachment point T, and the bracket 8B is attached to an upper portion at an attachment point R shown in FIG. 4B. An arm 8D is attached. For example, during cornering, the cross member 2 has a force (lateral force) F along the vehicle width direction from the suspension via the arms 8C and 8D and the brackets 8A and 8B as shown in FIGS. Is entered. When the vehicle body rigidity is low, when such a lateral force F is input, the cross member 2 bends as shown by a broken line in FIG. 5. Therefore, the lateral force F is applied to suppress such a bend. On the other hand, with the cage structure as described above, the cross member 2, the lean force 3 and the toe control arm 8C take charge of the reaction force to ensure the rigidity against the lateral force F (suspension rigidity).
[0005]
[Problems to be solved by the invention]
As a matter of course, it is desirable that the cross member 2, the lean force 3, the floor panel 4, the brace 105, and the like are set as thin as possible to reduce the weight of the vehicle body. However, in the above-described conventional vehicle body structure, in order to ensure the suspension rigidity with respect to the lateral force F as shown in FIG. 4A and FIG. It is necessary to set the plate thickness of the floor panel 4 and the brace 105 to a predetermined thickness or more in order to ensure the rigidity against the input P when the vehicle body is twisted as shown in FIGS. 4 (A) and 4 (B). Therefore, there is a problem that it is difficult to reduce the thickness by reducing the plate thickness.
[0006]
Although it is preferable to increase the rigidity of the vehicle body as much as possible, the cross member 2, the lean force 3 and the brace 105 are all supported by the floor panel 4 as shown in FIGS. 4 (A) and 4 (B). Since the floor panel 4 serving as the support base is plate-like and has low structural rigidity, even if the thickness of the cross member 2, the lean force 3 and the brace 105 is increased, the vehicle body 1 Therefore, there is a problem that it is structurally difficult to improve the rigidity of the vehicle body in terms of weight efficiency (while achieving weight reduction).
[0007]
The present invention has been devised in view of such problems, and an object of the present invention is to provide a vehicle body structure that can improve the rigidity of the vehicle body and reduce the weight of the vehicle body.
[0008]
[Means for Solving the Problems]
For this reason, the vehicle body structure of the present invention (Claim 1) includes a floor panel member that forms a floor portion around a rear seat back of a vehicle, and a vehicle width that is attached to the rear surface of the floor panel member in cooperation with the floor panel member. A cross member that forms a closed cross section extending in a direction, a hat-shaped lean force interposed in the closed cross section, and the floor panel member that is installed between the floor panel member and the seat back panel of the vehicle And a rear seat back brace that is superposed on the lean force.
The vehicle body structure according to the present invention (Claim 2) is the vehicle body structure according to Claim 1, wherein the rear seat back brace is formed in a hat shape having a flange portion, and a front flange of the rear seat bag brace. And the front flange portion of the cross member member are aligned with each other, and the rear flange portion of the rear seat back brace and the upper surface of the lean force are aligned with each other. A front flange portion of the rear seat back brace and a front flange portion of the cross member member are integrally welded via the floor panel member, and a rear flange portion of the rear seat back brace and an upper surface of the lean force Are integrally welded via the floor panel member .
The vehicle body structure according to the present invention (Claim 3) is the vehicle body structure according to Claim 1, wherein the rear seat back brace is formed of a panel material.
[0009]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments of the present invention will be described with reference to the drawings. FIGS. 1 and 2 are views showing a vehicle body structure as one embodiment of the present invention. Further, FIG. 5 used for explaining the prior art will also be used for explanation. In addition, about the component same as the component demonstrated with the prior art, the same code | symbol is attached | subjected and the description is partially abbreviate | omitted.
[0010]
A vehicle body structure as an embodiment of the present invention is applied around a rear seat back, and as shown in FIGS. 1 and 2, a rear floor panel (a floor panel member, hereinafter simply referred to as a floor panel) forming a vehicle body floor portion. ) 4, a rear floor cross member (cross member member, hereinafter also simply referred to as a cross member) 2 attached to the lower surface (back surface) 4 </ b> A of the floor panel 4 along the vehicle width direction, and an inner panel member 6 that forms the side wall of the vehicle body (See FIG. 2), a rear seat back brace (hereinafter also simply referred to as a brace) 5 attached to the upper surface of the floor panel 4 along the side wall of the vehicle body (inner panel member 6), and a rear shelf panel 7 (see FIG. 2, FIG. The cage structure is formed so as to surround the vehicle interior so as to ensure the rigidity of the vehicle body.
[0011]
Further, as shown in FIG. 2, the inner panel member 6 includes an inner panel 6A that forms a wall surface of the vehicle interior, a wheel house inner 6B that forms a part of the wheel house below the inner panel 6A, an inner panel 6A, and a wheel house inner. The seat back panel 6C is constructed between the 6Bs and extends toward the vehicle interior side.
The cross member 2 is formed of a hat-shaped member having a U-shaped cross section and having flange portions 2A and 2A at the top, and the flange portions 2A and 2A are floor panels with the opening facing upward. 4 is spot-welded as indicated by x in FIG. 1, thereby forming a closed cross section together with the floor panel 4. Further, in the closed cross section extending in the vehicle width direction, a lean force 3 formed in a hat shape is interposed on both the left and right sides (both sides in the vehicle width direction), and the lean force 3 extends downward from the opening. 1, the top surface 3A is spot-welded to the floor panel 4, and the flange portion 3B is spot-welded to the inner wall of the cross member 2 as indicated by x in FIG.
[0012]
Further, brackets 8A and 8B are spot-welded at both end portions of the cross member 2 as shown by X in FIG. 1, and the toe control arm 8C and the upper arm are attached to the brackets 8A and 8B. Each 8D is attached.
The brace 5 is formed in a hat shape, and is laid between the floor panel 4 and the seat back panel 6C. The brace 5 has an opening facing downward, and an upper portion 5A in front of the brace 5 is connected to the seat back panel 6C. The flange portion 5B in front of the vehicle body is connected to the flange portion of the cross member 2 via the floor panel 4. A flange portion 5C on the rear side of the vehicle body is spot-welded to 2A via the floor panel 4 to the upper surface 3A of the lean force 3 as indicated by x in FIG.
[0013]
That is, the position of the front flange portion 5B of the brace 5 and the position of the front flange portion 2A of the cross member 2 match, and the position of the rear flange portion 5C of the brace 5 and the top surface 3A of the reinforcement 3 match. Thus, the brace 5 is provided. Then, the front flange portion 5B of the brace 5 and the front flange portion 2A of the cross member 2 are integrally welded via the floor panel 4, and the rear flange portion 5C of the brace 5 and the upper surface 3A of the reinforcement 3 are provided. Are integrally welded via the floor panel 4 so that the respective connecting portions reinforce each other.
[0014]
Since the vehicle body structure as one embodiment of the present invention is configured as described above, the lateral force F (see FIG. 5) input from the suspension via the arms 8C and 8D and the brackets 8A and 8B, for example, during cornering. ) Is not only inputted to the cross member 2 and the lean force 3, but also to the brace 5 superposed on the cross member 2 and the lean force 3, as shown in FIG. 1, directly from the cross member 2 and the lean force 3. Entered. In addition, as shown in FIG. 1, the input (torsional force) P when the vehicle body is twisted is not only input to the brace 5 but also directly input from the brace 5 to the cross member 2 and the lean force 3. .
[0015]
Therefore, in the conventional vehicle body structure (see FIGS. 4A and 4B), for the lateral force F, the cross member, the lean force, and the brace for the torsional force P are separately responsible for the reaction force. On the other hand, in this vehicle body structure, the cross member 2, the lean force 3 and the brace 5 cooperate with each other for both the lateral force F and the torsional force P. There is an advantage that the rigidity can be improved.
[0016]
Furthermore, as the vehicle body rigidity is improved as described above, the thickness of the cross member 2, the lean force 3, the floor panel 4, the brace 5 and the like is reduced and the vehicle body is lightened within a range in which the vehicle body rigidity is not lowered as compared with the conventional case. There is also an advantage that it is possible.
Further, the members 2 to 5 are spot-welded as indicated by a cross in FIG. 1 at predetermined intervals along the vehicle width direction, and the vehicle body rigidity is increased by such welding in the vehicle width direction. There is an advantage that the number of points can be reduced and the manufacturing cost can be reduced.
[0017]
The vehicle body structure of the present invention is not limited to that of the above-described embodiment. For example, in the above-described embodiment, the brace 5 is formed in a hat shape and is superposed on both the cross member 2 and the lean force 3 via the floor panel 4, but the lateral force F and the twisting force P are used. In any case, the cross member 2, the lean force 3 and the brace 5 may be configured so as to receive a reaction force in cooperation with each other. For example, the brace 5 is formed of a panel material as in the conventional case. Alternatively, the cross member 2 and the reinforcement 4 may be superposed and welded via the floor panel 4.
[0018]
In the above-described embodiment, the brace 5 is connected to the inner panel member 6 by connecting to the seat back panel 6C as shown in FIG. 2, but the brace 5 is connected to the inner panel 6A or the wheel house inner 6B. In short, the brace 5 that receives a reaction force may be supported by the inner panel member 6.
Further, the vehicle body structure of the present invention can be widely applied to the joint portions of the strength members constituting the vehicle body other than around the rear seat back.
[0019]
【The invention's effect】
As described above in detail, according to the vehicle body structure of the present invention, the cross member member, the rear seat back brace, and the lean force are superposed via the floor panel member, so that the torsional force and lateral force that are input to the vehicle body. In any case, since the cross member member, the rear seat back brace and the lean force ensure the vehicle body rigidity while cooperating with each other, the vehicle body rigidity can be improved, and the respective flanges can be joined. The cross member member, lean force, and rear seat back brace reinforce each other at the center, reducing the thickness of the floor panel member, inner panel member, cross member member, and rear seat back brace and reducing the weight of the vehicle body. There is an advantage that it becomes possible to do.
[0020]
Furthermore, it is possible to reduce the number of welding points for joining the members by the improvement in the rigidity of the vehicle body, and there is an advantage that the manufacturing cost can be reduced.
[Brief description of the drawings]
FIG. 1 is a schematic cross-sectional view taken along the line XX of FIG. 2 showing a configuration of a vehicle body structure as one embodiment of the present invention, and corresponds to FIG. 4 (B).
FIG. 2 is a schematic cross-sectional perspective view showing a configuration of a vehicle body structure as one embodiment of the present invention.
FIG. 3 is a diagram for explaining the position of a rear seat back, and is a schematic perspective view showing the shape of a vehicle.
4A and 4B are schematic views showing a configuration around a conventional rear seatback, in which FIG. 4A is a cross-sectional view according to a front view, and FIG. 4B is a cross-sectional view taken along line AA in FIG. .
FIG. 5 is a schematic front view of a rear floor cross member showing the deflection of the rear floor cross member due to an input lateral force.
[Explanation of symbols]
1 Car body 2 Rear floor cross member (cross member member)
4 Floor panels (floor panel members)
5 rear seat back brace 6 inner panel member

Claims (3)

A floor panel member forming a floor around the rear seat back of the vehicle;
A cross member member which is attached to the back surface of the floor panel member and forms a closed section extending in the vehicle width direction in cooperation with the floor panel member;
A hat-shaped lean force interposed in the closed section;
A rear seat back brace that is constructed between the floor panel member and the vehicle seat back panel and is superposed on the cross member member and the lean force via the floor panel member. Car body structure. The rear seat back brace is formed in a hat shape having a flange portion, the front flange portion of the rear seat bag brace and the front flange portion of the cross member member coincide with each other, and the rear seat back brace It is arranged so that the position of the rear flange part of the brace and the upper surface of the lean force coincide,
The front flange portion of the rear seat back brace and the front flange portion of the cross member member are integrally welded via the floor panel member, and the rear flange portion of the rear seat back brace and the upper surface of the lean force The vehicle body structure according to claim 1, wherein and are integrally welded via the floor panel member .   The vehicle body structure according to claim 1, wherein the rear seat back brace is made of a panel material.

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