JP5759783B2 - Rear body structure of automobile - Google Patents

Description

  The present invention relates to a rear body structure of an automobile in which a rear wall portion of a rear pillar that forms a side edge portion of a back door opening and an extension panel that forms a lower edge corner portion of the back door opening are connected.

  From the viewpoint of increasing the rigidity of the connecting portion between the rear wall portion of the rear pillar that forms the side portion of the back door opening of the automobile and the extension panel that forms the lower side corner portion, for example, Patent Document 1 discloses an upper panel (rear side). A structure is disclosed in which a wall portion 3 and a lower panel (extension panel) 4 are connected with a convex closed cross section X interposed therebetween.

JP 2004-90805 A

  By the way, in the said conventional structure, since a rear wall part is a member different from a side outer panel, it is possible to form the complicated closed cross-section part for improving rigidity in this rear wall part. However, in the case of a structure in which the rear wall portion is formed integrally with the side outer panel, it is impossible to form a complicated closed cross-sectional portion on the rear wall portion as in the conventional structure. For this reason, it is difficult to obtain the rigidity of the connection portion between the rear wall portion and the extension panel, and in some cases, there is a concern that a crack or the like may occur in the connection portion.

  Further, when the rear wall portion is formed integrally with the side outer panel, there is a concern that cracks and cracks may occur because the rear wall portion is deep drawn with a small R.

  Further, when a convex stopper rubber contact seating surface that receives a load when the back door is closed is formed on the rear wall, for example, it is difficult to ensure the rigidity against the load in the same manner as described above.

  In order to increase the rigidity of the connecting part when such a rear wall part is integrally formed with the side outer panel, it is conceivable to increase the thickness of the connecting part or add a new reinforcing member. Then, the problem that a vehicle body weight and cost will raise arises.

  The present invention has been made in view of the above-described conventional situation, and it is an object of the present invention to provide a rear vehicle body structure that can increase the rigidity of a connection portion without causing an increase in vehicle body weight and cost.

  The present invention provides a rear combination lamp that forms a rear wall portion of a rear pillar that forms a side edge portion of a back door opening formed at a rear end of the vehicle, and a lower edge corner portion of the back door opening and projects forward of the vehicle. A rear vehicle body structure for connecting an extension panel in which a mounting recess is formed, wherein a convex bead projecting toward the rear of the vehicle is formed at a lower end portion of the rear wall portion, and an upper end of the extension panel A convex portion that protrudes rearward of the vehicle is formed continuously with the convex bead, and the convex portion is formed so as to extend from a connection portion with the convex bead to a ridge line of the concave portion of the extension panel. It is characterized by that.

  According to the rear vehicle body structure of the present invention, a convex bead is formed on the rear wall portion of the rear pillar, a convex portion continuous with the convex bead is formed on the extension panel, and the convex portion is connected to the convex bead. The extension panel was formed to extend to the ridge line of the recess.

  Since it is configured in this way, the connecting strip between the rear wall and the extension panel will be formed with a ridge that continues to both panels, and it can be connected without adopting a complex closed cross-sectional structure like the conventional structure. The rigidity of the part can be increased, and the occurrence of cracks and the like can be prevented.

  Moreover, since the convex bead is formed on the rear wall portion, the radius of curvature R when the rear wall portion is deep-drawn can be increased, the formability when the rear pillar is press-molded can be improved, and cracks and cracks can be generated. Can be prevented.

  By setting, for example, a stopper rubber contact seating surface in a portion having a high rigidity at the connecting portion between the rear wall portion and the extension panel, it is possible to ensure the rigidity against the load when the back door is closed.

  Since the present invention has a structure in which only a convex bead and a convex portion are formed continuously at the connecting portion between the rear wall portion and the extension panel, it is necessary to increase the plate thickness or add a reinforcing member. No increase in vehicle weight and cost can be prevented.

1 is a rear view of a rear vehicle body according to a first embodiment of the present invention. It is a rear view of the connection part of the side outer panel and extension panel of the said rear vehicle body. FIG. 3 is a cross-sectional view of the connecting portion (a cross-sectional view taken along line III-III in FIG. 2). It is sectional drawing (IV-IV sectional view taken on the line of FIG. 2) of the said connection part. It is sectional drawing (VV sectional view taken on the line of FIG. 2) of the said extension panel.

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

  1 to 5 are views for explaining a rear body structure of an automobile according to a first embodiment of the present invention.

  In the figure, reference numeral 1 denotes a rear body of the automobile. On the rear end surface of the rear vehicle body 1, a back door opening 1 a having a size extending over the entire area is formed, and a flip-up back door 2 is disposed in the back door opening 1 a.

  The rear vehicle body 1 includes a lower back panel 5 extending in the vehicle width direction that forms a lower side portion of the back door opening 1a, and a rear pillar that extends in the vertical direction forming left and right side portions in the vehicle width direction of the back door opening 1a. 6 and 6, extension panels 7 and 7 forming the left and right lower corners of the back door opening 1a, and an upper back panel 8 extending in the vehicle width direction forming the upper side of the back door opening 1a. ing. A hinge member (not shown) for rotatably supporting the back door 2 is attached to the upper back panel 8.

  The lower back panel 5 has a cylindrical closed cross section extending in the vehicle width direction by connecting upper flange portions 5c and lower flange portions 5d of the lower back outer 5a and the lower back inner 5b having a hat-shaped cross section. a has a structure formed. A back door opening 1 a is formed by the upper flange portion 5 c of the lower back panel 5.

  The left and right extension panels 7 are connected to the rear pillar 6 and the lower back panel 5, and the rear flange portions 7c of the extension outer panel 7a and the extension inner panel 7b and the front flange portions (not shown) are connected to each other. By doing so, it has a structure in which a cylindrical closed section c is formed. A back door opening 1a is formed by the rear flange portion 7c.

  The extension outer panel 7a is formed with a recess 7d having a size that extends over substantially the entire area of the extension outer panel 7a. The recess 7d has a bottom wall 7e and a peripheral wall 7f surrounding the bottom wall 7e, and a rear combination lamp 18 is attached in the recess 7d.

  The left and right rear pillars 6 are cylinders that extend in the vertical direction by connecting the rear flange portions 6c, 6c of the side outer panel 6a and the side inner panel 6b, and the front flange portions (not shown). A closed cross-section portion b is formed. A back door opening 1 a is formed by the rear flange portion 6 c of the rear pillar 6.

  A closed section b of the rear pillar 6 is continuous with a closed section a of the lower back panel 5 and a closed section c of the extension panel 7. Further, each closed cross-section portion a, b, c is formed along the edge of the back door opening, whereby the left, right side portion, and lower side corner portion of the back door opening 1a have a continuous closed cross-section structure with high rigidity. It has become.

  The side outer panel 6a has a rear wall portion 6e that bends and extends inward of the vehicle following the rear edge of the side outer panel 6a. The rear wall portion 6e is connected to the side inner panel 6b and the closed cross-section portion b. Is forming.

  The rear wall 6e is formed in the upper half of the side outer panel 6a. The lower half of the rear wall 6e is a notch 6f formed by cutting the rear wall 6e into a stepped shape, and the notch 6f and the side inner panel 6b There is a gap between them.

  The extension outer panel 7a is disposed so as to cover a space between the notch 6f of the side outer panel 6a and the side inner panel 6b.

  The rear flange portion 7c of the extension outer panel 7a is overlapped and joined to the rear flange portion 6c of the side inner panel 6b, and a back door opening 1a is formed by the rear flange portions 6c, 7c.

  The outer edge portion 7g of the extension outer panel 7a is overlapped and coupled to the notch portion 6f of the side outer panel 6a.

  The upper edge portion 7h of the extension outer panel 7a is overlapped and coupled to the lower edge portion 6h of the rear wall portion 6e of the side outer panel 6a. The rear wall 6e and the extension outer panel 7a are joined by a plurality of spot welding (see the crosses in FIG. 2).

  The rear wall 6e has a vehicle width dimension narrower than that of the extension outer panel 7a. Further, the extension outer panel 7a is formed so as to be wider toward the lower side from the connecting portion with the rear wall portion 6e.

  A convex bead 6i is formed at the lower end of the rear wall 6e of the side outer panel 6a.

  The convex bead 6i is formed at the center in the vehicle width direction of the rear wall 6e. Between the convex bead 6i of the rear wall portion 6e and the rear flange portion 6c, an overhanging portion 6j that projects rearward from the convex bead 6i is formed. Further, a stepped portion 6k is formed between the convex bead 6i and the outer edge of the rear wall portion 6e. The stepped portion 6k is stepped in front of the convex bead 6i. As described above, since the stepped portion 6k, the convex bead 6i, and the overhanging portion 6j are bent on the rear wall portion 6e, the R of the rear wall portion 6e can be increased, and the formability during deep drawing can be improved. At the same time, the rigidity of the entire rear pillar 6 in the front-rear direction can be increased. In addition, the arrow of FIG. 4 has shown the press direction.

  The convex bead 6i is formed with a stopper abutting seat surface 6i ', and a rubber stopper member 20 attached to the back door 2 abuts against the corresponding seating surface 6i' when the door is closed.

  At the upper end portion of the extension outer panel 7a, a convex portion 7i that protrudes rearward of the vehicle is formed continuously to the convex bead 6i. The convex portion 7i has substantially the same shape as the convex bead 6i, and is extended from the connecting portion with the convex bead 6i so as to be connected to the ridgelines L and L on the left and right edges of the concave portion 7d of the extension outer panel 7a. Yes. Thereby, the said convex part 7i and the recessed part 7d have comprised the continuous surface.

  According to the present embodiment, the convex bead 6i is formed at the lower end portion of the rear wall portion 6e formed integrally with the side outer panel 6a of the rear pillar 6 and the convex portion continuous with the convex bead 6i is formed at the upper end portion of the extension outer panel 7a. A portion 7i was formed, and the convex portion 7i was extended from the connection portion with the convex bead 6i so as to continue to the left and right ridge lines L of the concave portion 7d of the extension outer panel 7a.

  Since it comprised in this way, the protruding item | line part over both panels 6e and 7a will be formed in the connection part of the rear wall part 6e of the side outer panel 6a, and the extension outer panel 7a, and the complicated closure like the past is formed. Without adopting a cross-sectional structure, the rigidity of the connecting portion between the rear wall 6e and the extension outer panel 7a can be increased with a simple structure. As a result, it is possible to prevent cracks and the like from occurring in the connecting portion.

  Further, since the convex bead 6i is formed on the rear wall portion 6e, the radius of curvature R when the rear wall portion 6e is deep-drawn can be made larger than R 'when there is no bead (see FIG. 4). Formability when the outer panel 6a is press-molded can be improved, and generation of cracks and cracks can be prevented.

  In this embodiment, since the contact seat surface 6i 'with which the stopper member 20 of the back door 2 abuts is formed on the convex bead 6i, the rigidity against the load when the back door is closed can be ensured, and repeated opening and closing. Deformation can be prevented.

  In this embodiment, the structure is such that the convex beads 6i and the convex portions 7i are formed continuously at the connecting portion between the rear wall portion 6e and the extension outer panel 7a, so that the plate thickness is increased or a reinforcing member is added. There is no need to increase the vehicle weight and cost.

DESCRIPTION OF SYMBOLS 1 Rear vehicle body 1a Back door opening 6 Rear pillar 6a Side outer panel 6e Rear wall part 6i Convex bead 7 Extension panel 7a Extension outer panel 7d Concave part 7i Convex part 18 Rear combination lamp L Ridge line

Claims (1)

The rear wall of the rear pillar that forms the side edge of the back door opening formed at the rear end of the vehicle;
A rear vehicle body structure for connecting an extension panel formed with a rear combination lamp mounting recess that forms a lower edge corner portion of the back door opening and projects forward of the vehicle,
A convex bead that protrudes toward the rear of the vehicle is formed at the lower end of the rear wall,
On the upper end portion of the extension panel, a convex portion that protrudes rearward of the vehicle continuously to the convex bead is formed,
The rear body structure of an automobile, wherein the convex portion is formed to extend from a connection portion with the convex bead to a ridge line of the concave portion of the extension panel.

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