JP4193373B2 - Hollow structure - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a hollow structure, and more particularly to a hollow structure constituting a skeleton member of a vehicle such as an automobile.
[0002]
[Prior art]
Conventionally, an example of a hollow structure constituting a skeleton member of a vehicle such as an automobile is disclosed in Japanese Patent Laid-Open No. 9-193832.
[0003]
As shown in FIG. 6, in this hollow structure, a center pillar 100 as a hollow structure is composed of an outer panel 102, an inner panel 104, and a lower reinforcement 106. Each of the members 102, 104, and 106 is formed in a bowl shape without a flange, and both side pieces 102A, 102B, 104A, 104B, 106A, and 106B of the members 102, 104, and 106 are parallel to each other. It is overlapped and has a cross-sectional shape.
[0004]
[Problems to be solved by the invention]
However, in this hollow structure, three parts of the outer panel 102, the inner panel 104, and the lower reinforcement 106 are used in order to make the cross-sectional shape of a letter, and the number of component parts is large. Further, in this hollow structure, since the side pieces 102A, 104A, 106A and 102B, 104B, 106B of the three parts of the outer panel 102, the inner panel 104, and the lower reinforcement 106 are welded, The distance L is widened and the strength is lowered.
[0005]
In view of the above facts, an object of the present invention is to obtain a hollow structure that can reduce the number of parts and improve the strength.
[0006]
[Means for Solving the Problems]
The hollow structure according to the first aspect of the present invention has a closed cross-section structure, and a side member in which a concave portion that extends along the vehicle body longitudinal direction and is recessed toward the inside of the closed cross-section structure is formed on the upper wall portion,
A panel that is fixed to the upper wall portion of the side member and has a bead that protrudes upward at a portion facing the concave portion along the longitudinal direction of the vehicle body ;
The two side closed cross-sectional structure is formed by welding the side member and the panel by one-side welding at both outer side portions of the closed cross-sectional structure formed by the recess and the bead .
[0007]
Accordingly, the structure is a closed cross-section structure, and the upper wall portion is fixed to the upper wall portion of the side member that extends along the longitudinal direction of the vehicle body and has a concave portion that is recessed toward the inside of the closed cross-sectional structure. Since the two-layer closed cross-sectional structure can be formed by the bead of the panel in which the bead protruding upward in the portion facing the recess is formed in the longitudinal direction of the vehicle body , the number of parts can be reduced. In addition, since the side member and the panel can be welded by one-side welding at both outer sides of the closed cross-sectional structure formed by the recess and the bead, the interval between the welded portions is made narrower than the interval between the side wall portions of the side member , thereby increasing the strength. It can be improved.
[0008]
According to a second aspect of the invention, the hollow structure according to claim 1, that the closed cross section formed by the said side member and the panel was formed on the side where the bending compression of the side member takes It is characterized by.
[0009]
Therefore, in addition to the content of the first aspect, the strength of the side member subjected to compression can be increased, so that bending deformation can be effectively suppressed.
[0010]
According to a third aspect of the invention, the hollow structure according to claim 1 or claim 2, and characterized in that a filling material into the closed section structure formed by the said side member and said panel To do.
[0011]
Therefore, in addition to the content of Claim 1 or Claim 2 , the strength can be increased by providing the filler in the closed cross-sectional structure formed by the side member and the panel.
[0014]
DETAILED DESCRIPTION OF THE INVENTION
An embodiment of a hollow structure in the present invention will be described with reference to FIGS.
[0015]
In the figure, the arrow FR indicates the vehicle front direction, the arrow UP indicates the vehicle upward direction, and the arrow IN indicates the vehicle width inside direction.
[0016]
As shown in FIG. 3, the hollow structure of the present embodiment is applied to the front side member 10, and the front side member 10 is a pair of left and right along the vehicle front-rear direction in the vicinity of both lower ends in the vehicle width direction of the front part of the vehicle. (The front side member on the left side of the vehicle is not shown). Further, the front portion 12 of the front side member 10 is disposed in the engine room, and the rear portion 14 of the front side member 10 is provided on the lower surfaces of the inclined portion 16A, the flat portion 16B, and the floor panel 18 of the dash panel 16. Along the rear of the vehicle.
[0017]
The front portion 12 of the front side member 10 includes a front side member lower 20 as a structure constituting the lower portion of the front side member 10 and a front side member upper 22 as a structure constituting the upper portion of the front side member 10. It is configured. The front side member lower 20 is manufactured in a cylindrical shape by, for example, hydroforming.
[0018]
At the front side 12 of the front side member 10, the cross-sectional shape of the front side member lower 20 viewed from the front-rear direction of the vehicle is the letter R shape. Further, the cross-sectional shape of the front side member upper 22 viewed from the front-rear direction of the vehicle is a U-shape with the opening directed downward in the vehicle, and the lower end portions of the left and right side wall portions 22A and 22B are respectively front side members. For one-side welding in which the upper ends of the left and right side wall portions 20A and 20B in the lower 20 are welded only from one side, that is, from the outer peripheral side of the front side member upper 22 to the welding surfaces such as laser welding, arc welding, and plasma welding. Are welded. As a result, the cross-sectional shape of the front side member 10 viewed from the vehicle front-rear direction is a Japanese character.
[0019]
Note that a suspension lower arm (not shown) is attached to the lower portion of the front side member 10 by a bolt (not shown) screwed into a nut 28 welded to the front side member lower 20.
[0020]
Further, the rear portion 14 of the front side member 10 is composed of only the front side member lower 20.
[0021]
As shown in FIG. 2, in a portion that becomes the rear portion 14 of the front side member 10, a concave portion having a reverse trapezoidal cross-sectional shape extending in the front-rear direction at the center in the width direction of the upper wall portion 20C of the front side member lower 20. 30 is formed. In addition, a bead 32 having a trapezoidal cross-sectional shape protruding upward is formed along the front-rear direction at each portion of the inclined portion 16A and the flat portion 16B of the dash panel 16 facing the concave portion 30 of the front side member lower 20. Yes.
[0022]
As shown in FIG. 3, a bead 32 is also formed along the front-rear direction at a portion of the floor panel 18 that faces the recess 30 of the front side member lower 20.
[0023]
As shown in FIG. 1, both outer side portions 16C of the beads 32 of the dash panel 16 are superposed on both side portions 20D of the upper wall portion 20C of the front side member lower 20, and laser welding, arc welding, plasma welding, etc. Are welded (welded portion P) by one-side welding in which welding is performed only from one side, that is, from above the front side member lower 20. Further, these welds P are continuous along the vehicle longitudinal direction as shown in FIG.
[0024]
As a result, in the first closed cross-section structure 40 formed by the front side member lower 20, the second closed section formed by the front side member lower 20 and the dash panel 16 is formed on the side where bending compression is applied, in the present embodiment, on the upper side. A cross-sectional structure 42 is formed to form a two-layer closed cross-sectional structure.
[0025]
The front side member lower 20 and the floor panel 18 are similarly joined with a two-layer closed cross-sectional structure.
[0026]
Next, the operation of this embodiment will be described.
[0027]
In the rear portion 14 of the front side member 10 in the present embodiment, two members of the front side member lower 20 and the dash panel 16 are welded by one-side welding to form a two-layer closed cross-sectional structure. As a result, the number of parts can be reduced as compared with the conventional structure in which the two-layer closed cross-sectional structure is formed by three parts.
[0028]
In addition, as shown in FIG. 1, the dash panel 16 and the inner side of both side walls 20 </ b> A and 20 </ b> B of the front side member lower 20, that is, on both side portions 20 </ b> D of the upper wall portion 20 </ b> C of the front side member lower 20 Since the two welded portions P can be formed, the distance L1 between the two welded portions P is narrower than the distance L2 between the side wall portions 20A and 20B of the front side member lower 20, and the strength can be improved.
[0029]
In the present embodiment, in the first closed cross-section structure 40 formed by the front side member lower 20, the second closed cross-section structure formed by the front side member lower 20 and the dash panel 16 on the upper side where bending compression is applied. 42 is formed. As a result, the strength of the upper side subjected to compression in the front side member lower 20 can be increased, so that bending deformation can be effectively suppressed.
[0030]
Although the present invention has been described in detail with respect to specific embodiments, the present invention is not limited to such embodiments, and various other embodiments are possible within the scope of the present invention. It will be apparent to those skilled in the art. For example, in the above embodiment, the cross-sectional shape of the concave portion 30 is an inverted trapezoidal shape, and the cross-sectional shape of the bead 32 is a trapezoidal shape, but the cross-sectional shapes of the concave portion 30 and the bead 32 are not limited to the above shapes .
[0031]
Moreover, in the said embodiment, as FIG. 2 showed, although the welding part P of the front side member lower 20 and the dash panel 16 was formed continuously along the vehicle front-back direction, it replaces with this in FIG. As shown, only the bent portion 20E of the front side member lower 20 or only the bent portion 20E and the vicinity thereof may be welded continuously, and other portions may be welded at a predetermined interval.
[0032]
In the above embodiment, as shown in FIG. 1, the second closed cross-sectional structure 42 formed by the front side member lower 20 and the dash panel 16 is a cavity, but instead, this is shown in FIG. 5. As described above, the filler 44 such as foamed resin may be provided in the second closed cross-sectional structure 42 formed by the front side member lower 20 and the dash panel 16 to increase the strength .
[0033]
Moreover, in the said embodiment, although the hollow structure body of this invention was applied to the front side member 10, the hollow structure body of this invention is applicable also to other side members other than a front side member .
[0034]
【The invention's effect】
The hollow structure according to the first aspect of the present invention has a closed cross-sectional structure, a side member in which a concave portion extending along the longitudinal direction of the vehicle body and recessed toward the inside of the closed cross-sectional structure is formed in the upper wall portion, A panel that is fixed to the upper wall of the member and has a bead that protrudes upward in a portion facing the recess and is formed along the longitudinal direction of the vehicle body, on both outer sides of the closed cross-sectional structure formed by the recess and the bead Since the two-layer closed cross-sectional structure is formed by welding the side member and the panel at one part by one-side welding, it has an excellent effect that the number of parts can be reduced and the strength can be improved.
[0035]
According to a second aspect of the present invention, in the hollow structure according to the first aspect, the closed cross-sectional structure formed by the side member and the panel is formed on the side where the side member is bent and compressed. In addition to the effects described above, it has an excellent effect that bending deformation can be effectively suppressed.
[0036]
According to a third aspect of the invention, the hollow structure according to claim 1 or claim 2, in which a filler closed section structure formed by the side member and the panel, according to claim 1 or claim In addition to the effect described in 2 , it has an excellent effect that the strength can be increased.
[Brief description of the drawings]
FIG. 1 is an enlarged cross-sectional view taken along line 1-1 of FIG.
FIG. 2 is a perspective view showing a hollow structure according to an embodiment of the present invention, as viewed from the obliquely rearward inner side of the vehicle body.
FIG. 3 is a perspective view showing a part of a vehicle body to which a hollow structure according to an embodiment of the present invention is applied, as viewed from the obliquely rearward inner side of the vehicle body.
FIG. 4 is a perspective view showing a hollow structure according to another embodiment of the present invention as seen from the obliquely rearward inner side of the vehicle body.
FIG. 5 is a cross-sectional view corresponding to FIG. 1 showing a hollow structure according to another embodiment of the present invention.
FIG. 6 is a cross-sectional view showing a conventional hollow structure.
[Explanation of symbols]
10 Front side member 14 Rear part of front side member 16 Dash panel (panel)
20 front side member lower (side members of the closed cross-sectional structure)
40 First closed section structure 42 Second closed section structure 44 Filler

Claims (3)

A side member that has a closed cross-sectional structure and that extends along the longitudinal direction of the vehicle body on the upper wall and has a recess that is recessed toward the inside of the closed cross-sectional structure;
A panel that is fixed to the upper wall portion of the side member and has a bead protruding upward in a vehicle body front-rear direction at a portion facing the recess ;
And a two-layer closed cross-section structure is formed by welding the side member and the panel by one-side welding at both outer side portions of the closed cross-section structure formed by the recess and the bead. Structure. The hollow structure according to claim 1, characterized in that the said closed section structure formed by the side members and the panels were formed on the side where the bending compression of the side member takes. The hollow structure according to claim 1 or claim 2, characterized in that a filling material into the closed section structure formed by the said side member and said panel.

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