JP3432383B2 - Backdoor reinforcement structure - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a back door reinforcement structure, and more particularly to a reinforcement structure for a hinge attachment portion of a side opening type back door.

[0002]

2. Description of the Related Art Generally, in the case of a laterally opening type back door, there is a demand to widen the hinge pitch in order to secure the door rigidity. Therefore, it is desirable to set the position of the upper hinge as high as possible. On the other hand, there is a demand to lower the belt line part of the back door as much as possible in order to secure the visibility.

In order to meet such conflicting demands,
It is known that an upper hinge of a back door is arranged in a window frame portion near a lower corner portion of a rear window glass (see Japanese Utility Model Laid-Open No. 1-285422).

[0004]

However, in the case of the back door structure as described above, since the upper hinge is arranged in the narrow space of the lower corner portion of the rear window glass, the surface rigidity of the hinge mounting surface is ensured. Difficult to do. Therefore, it is necessary to stack a large number of reinforcements or to use a reinforcement made of a thick plate, which has a drawback of increasing the mass and the cost. Especially for backdoors with spare tires,
Since the weight of the back door is large, the load on the hinge mounting surface is further increased.

SUMMARY OF THE INVENTION Therefore, an object of the present invention is to provide a back door reinforcement structure capable of increasing the surface rigidity of the upper hinge mounting surface even when the upper hinge is arranged in a narrow space in a back door on which a spare tire can be mounted. To provide.

[0006]

In order to achieve the above object, the present invention has a side opening type back door in which an upper hinge is arranged in the vicinity of a lower corner portion of a rear windshield and a spare tire is supported on an outer side surface. In the inside of the back door, a reinforcement for supporting a spare tire having one end extended to the upper hinge mounting portion is arranged,
The upper hinge retainer is joined and fixed to the extension so that a closed cross-section space having a height approximately equal to the belt line of the back door is formed between the upper and lower hinge retainers, and both upper and lower portions of the upper hinge retainer sandwiching the closed cross-section space. And a flange portion to be joined to the extension portion in a superposed manner is formed, and an upper hinge is fastened to the flange portion.

A closed cross section space is formed by an extension portion of the reinforcement for supporting a spare tire arranged inside the back door and an upper hinge retainer joined to this extension portion, and both upper and lower sides sandwiching this closed cross section space. The upper hinge is fastened to the flange portion of the. A lateral load acts on the upper hinge due to the weight of the back door, but since the closed cross-section space is formed between the upper and lower flanges that are the hinge mounting surface, the side wall of the closed cross-section space pulls the lateral load. Alternatively, it receives as a compressive load and suppresses deformation of the hinge mounting surface. Moreover, since the closed cross-section space is formed at substantially the same height as the belt line of the back door, the lateral load applied to the upper hinge is effectively received by the closed cross-section space and the belt line. Therefore, sufficient surface rigidity of the hinge mounting surface can be secured even in a narrow space near the lower corner portion of the rear window glass and even in a reinforcement having a relatively thin plate thickness.

Since the spare tire support reinforcement extends continuously from the spare tire mounting portion to the hinge mounting portion, there is no break in strength and the load of the spare tire can be effectively supported by the hinge portion. You can Therefore, distortion of the back door due to the weight of the spare tire can be prevented.

One end of the above-mentioned reinforcement for supporting a spare tire is extended to a lower hinge attachment portion, and a lower hinge retainer is joined to this extension portion so that a closed cross section space is formed between the two. You may fix it. In this case, it is preferable to form flange portions on both upper and lower sides of the lower hinge retainer that sandwich the closed cross-section space so as to be overlapped and joined with the extension portion, and fasten the lower hinge to these flange portions.
In this case, since the same reinforcing structure as that of the upper hinge mounting portion can be formed in the lower hinge mounting portion, the supporting rigidity of the entire back door is increased.

[0010]

1 is a rear view of a vehicle provided with a laterally opening type back door according to the present invention, FIG. 2 is an internal structural view of the back door, and FIGS. 3 and 4 are cross-sectional views of a mounting portion of a back door hinge. The figure is shown. In addition, in the figure, the black-painted portions indicate spot welds.

The back door 1 is rotatably supported by a rear pillar 3 on the right side of the vehicle body with upper and lower hinges 4 and 5 as fulcrums. The hinges 4 and 5 are, as shown in FIGS.
The hinge brackets 4a and 5a fixed to the hinge mounting portions 3a and 3b of the rear pillar 3 and the hinge arms 4b and 5b fixed to the hinge mounting portions 1a and 1b of the back door 1 are horizontally connected via hinge pins 4c and 5c. It is connected so that it can rotate in any direction.

The rear pillar 3 includes an outer panel 10 and an inner panel 11, and an extension panel 12 is bridged and joined between rear end portions thereof. Inside the rear pillar 3, a reinforcement unit R having a closed cross-section structure is provided with upper and lower hinge mounting portions 3a, 3a.
It is continuously arranged between b. The first reinforcement 14 constituting the reinforcement unit R
The second reinforcement 15 and the second reinforcement 15 are both formed in a hat-shaped cross section, and the joint flanges formed on the left and right sides thereof are spot-welded to form a box-shaped closed cross section 1.
6 is formed. The bottom surface of the first reinforcement 14 is arranged along the back surface of the extension panel 12, which is the hinge mounting surface, and is spot-welded. In addition, an inwardly extending extension portion is integrally formed on the joint flange on the inner side in the vehicle width direction of the second reinforcement 15, and the extension portion is bent rearward to join the inner panel 11 and the extension panel 12 together. It is spot welded by being sandwiched between the flanges.

Retainers 17, 1 having nuts 19, 20 fixed in advance are provided at positions corresponding to the upper and lower hinge mounting portions 3a, 3b and on the back surface of the first reinforcement 14.
8 are arranged. The hinge brackets 4a and 5a are arranged on the front side in the vehicle width direction surface of the extension panel 12, and the plurality of hinge fixing bolts 21 and 22 penetrate the extension panel 12 and the first reinforcement 14 to provide the nuts 19 and 20. By concluding
The hinge brackets 4a and 5a are fixed. As described above, since the hinge brackets 4a and 5a are integrally combined with the reinforcement unit R having a thick closed cross-section structure, a hinge mounting structure having excellent strength can be realized.

On the other hand, hinge arms 4b and 5b are fastened and fixed to the front-rear surface of the side end of the back door 1.
The back door 1 also includes an outer panel 23 and an inner panel 24, and inside thereof, a spare tire supporting reinforcement 25 shown in FIG. 2 is arranged. A carrier 6 for supporting the spare tire 2 is fixed to the outer surface of the reinforcement 25. One end portion of the reinforcement 25 extends to the attachment portion of the upper and lower hinges 4 and 5, and the upper extension portion 25a has an upper hinge retainer 26 having a hat-shaped vertical cross section and the lower extension portion 25b.
A lower hinge retainer 30 having a hat-shaped vertical cross section is joined and fixed to each of them.

The rear window glass 7 is formed in such a size as to cover substantially the upper half of the back door 1, and a black ceramic coating 7b for shielding the opening flange of the back door 1 is applied to the inner surface of the peripheral portion thereof. . One lower corner portion 7a of the rear window glass 7 is recessed, and an upper extension 25a is provided to a window frame portion corresponding to the lower corner portion 7a.
Is in. That is, the upper extension 25a extends above the belt line BL. A garnish 8 is attached to the window frame portion corresponding to the lower corner portion 7a.

A flange 25 having a predetermined width is provided on the upper edge portion of the reinforcement 25 constituting the belt line BL.
c is formed, and the flange 25c is spot-welded by being sandwiched between the upper edge portions of the outer panel 23 and the inner panel 24 of the back door 1. for that reason,
The belt line BL has great strength.

As shown in FIG. 7, the upper hinge retainer 2
A flange portion 26a is formed around 6 and a bulging portion 26b that bulges rearward is integrally formed in the central portion. Therefore, when the flange portion 26a is superposed on the upper extension portion 25a of the reinforcement 25 and spot-welded, a gap between the extension portion 25a and the bulging portion 26b is formed as shown in FIG.
A closed cross section space 27 is formed as shown in FIG. The closed cross section space 27 is located at substantially the same height as the belt line BL. Flange portions 26a on both upper and lower sides sandwiching the bulging portion 26b
A nut 28 for fastening the upper hinge is welded and fixed to the back surface of the. Attach the hinge fastening bolt 29 to the inner panel 2
4, the upper hinge arm 4b is fixed to the back door 1 by being fastened to the nut 28 via the reinforcement 25 and the hinge retainer 26.

As shown in FIG. 8, the lower hinge retainer 3
A flange portion 30a is formed around 0, and a bulging portion 30b bulging rearward is integrally formed in the central portion. When the flange portion 30a is superposed on the lower extension portion 25b of the reinforcement 25 and spot welded,
A closed cross-section space 31 is formed between the lower extension portion 25b and the bulging portion 30b as shown in FIG. Nuts 32 for fastening the lower hinge are welded and fixed to the back surfaces of the flange portions 30a on both the upper and lower sides of the bulging portion 30b. By fastening the hinge fastening bolts 33 to the nuts 32 via the inner panel 24, the reinforcement 25, and the hinge retainer 30, the lower hinge arm 5b is moved to the back door 1.
Fixed to.

In the back door 1 having the above structure, an inward load in the vehicle width direction indicated by an arrow A in FIG. 2 acts on the upper hinge arm 4b due to the weight of the back door 1, and the lower hinge 5 acts on the lower hinge 5. A load outward in the vehicle width direction indicated by an arrow B in FIG. 2 acts. Particularly, when the spare tire 2 is mounted on the outer surface of the back door 1, the weight of the back door 1 increases and the lateral loads A and B also increase. Therefore, the lateral loads A and B are the flange portions 26a and 30a which are the mounting surfaces of the upper and lower hinges 4 and 5.
As described above, the extension portions 25a and 25b of the spare tire supporting reinforcement 25 and the upper and lower hinge retainers 26 and 30 form closed cross-section spaces 27 and 31. Since the hinge arms 4b and 5b are fastened to the flange portions 26a and 30a on both the upper and lower sides, the closed cross-section spaces 27 and 31 (the bulged portions 26b and 30) are formed.
The side walls 26c and 30c of b) receive the lateral loads A and B as tensile loads or compression loads, and deformation of the flange portions 26a and 30a can be suppressed.

In particular, since the upper extension 25a of the reinforcement 25 is inserted into the window frame portion near the lower corner of the rear window glass 7, it has a small width, but is joined to the upper extension 25a. Since the bulging portion 26b of the upper hinge retainer 26 is set to a height almost equal to the belt line BL, the belt line B having high strength is provided.
The L portion and the side wall 26c of the bulging portion 26b are integrated,
The lateral load A can be effectively received. Therefore, even if the reinforcement 25 and the hinge retainer 26, which are relatively thin, are used, sufficient back door rigidity can be secured,
The weight reduction and cost reduction of the back door 1 can be realized.

Further, since the spare tire supporting reinforcement 25 continuously extends from the spare tire mounting portion to the hinge mounting portion, there is no breaking point in strength, and the load of the spare tire is effective at the hinge portion. Can be supported by. Therefore, the distortion of the back door 1 due to the weight of the spare tire 2 can be prevented.

The upper backdoor binge 4 is covered by the rear combination lamp 40 (see FIG. 3), and the lower backdoor hinge 5 is covered by the garnish 41 (see FIG. 4). The outer surfaces of the rear combination lamp 40 and the garnish 41 are formed into a curved surface that is substantially continuous with the outer surface of the rear pillar 3 and the outer surface of the back door 1, so that a sleek and smooth appearance can be secured.

The present invention is not limited to the above embodiment. In the above embodiment, the upper hinge retainer 26 and the lower hinge retainer 30 are provided with the bulging portions 26b and 30b, respectively, and the bulging portion and the extension portions 25a and 25b of the reinforcement 25 form a closed cross-section space. The bulging portions may be provided on the extension portions 25a and 25b side, or the bulging portions may be provided on both sides. In the embodiment described above, the extension portion 25a extended to the upper hinge attachment portion and the extension portion 25b extended to the lower hinge attachment portion are integrally formed at one end of the spare tire supporting reinforcement 25. But,
The lower extension 25b can be omitted. Although the closed cross-section space 31 is formed between the lower extension portion 25b and the lower hinge retainer 30, they may be simply overlapped without forming a closed cross section, or the lower hinge retainer 3 may be formed.
0 may be omitted and the nut 32 for hinge fastening may be directly fixed to the lower extension portion 25b.

[0024]

As is apparent from the above description, according to the present invention, one side end portion of the spare tire supporting reinforcement disposed inside the back door is extended to the upper hinge mounting portion, and A closed cross-section space that is approximately the same height as the back door belt line is formed between the upper hinge retainer joined to the extension, and the upper and lower flanges of the upper hinge retainer that sandwich the closed cross-section space overlap the extension. Since they are also fastened together with the upper hinge, the lateral load applied to the upper hinge can be effectively received by the side wall of the closed cross section space and the belt line portion, and sufficient surface rigidity of the hinge mounting surface can be secured.
Therefore, the upper hinge can be arranged in a narrow space such as the window frame portion near the lower corner portion of the rear window glass, and the door pitch can be widened, so that the door rigidity is also increased. Also, since the reinforcement extends continuously from the spare tire mounting portion to the hinge mounting portion,
There is no break in strength, and the load of the spare tire can be effectively supported by the hinge part.

[Brief description of drawings]

FIG. 1 is a rear view of an example of a vehicle including a back door according to the present invention.

FIG. 2 is a rear view showing the internal structure of the back door shown in FIG.

3 is a sectional view taken along line III-III in FIG.

4 is a sectional view taken along line IV-IV in FIG.

5 is a sectional view taken along line VV of FIG.

6 is a sectional view taken along line VI-VI of FIG.

FIG. 7 is a perspective view of an upper hinge retainer.

FIG. 8 is a perspective view of a lower hinge retainer.

[Explanation of symbols]

1 back door 3 rear pillar 4 Upper hinge 5 Lower hinge 4b, 5b hinge arm 25 Spare tire support reinforcement 25a upper extension 26 Upper hinge retainer 26a Flange part 26b bulge 27 Closed section space 30 Lower hinge retainer BL belt line

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Claims (2)

(57) [Claims] 1. A side-opening back door having an upper hinge arranged near a lower corner portion of a rear window glass and supporting a spare tire on an outer surface, wherein one side end has an upper hinge inside the back door. A spare tire supporting reinforcement extended to the mounting portion is arranged, and an upper hinge retainer is provided in the extension portion so that a closed cross-section space having a height approximately equal to the belt line of the back door is formed between them. A back door characterized by joining and fixing, and forming flange portions on the upper and lower sides of the upper hinge retainer sandwiching the closed cross-section space so as to be superposed and joined with the extension portion, and fastening the upper hinge to these flange portions. Reinforcement structure. 2. An extension portion extending to a lower hinge attachment portion is formed at one end of the spare tire supporting reinforcement, and a lower hinge retainer is closed between the extension portion and the lower hinge attachment portion. Joined and fixed so that a cross-sectional space is formed, and flange parts to be joined by being overlapped with the extension part are formed on both upper and lower sides of the lower hinge retainer that sandwiches the closed cross-sectional space, and the lower hinge The reinforcing structure for the back door according to claim 1, wherein the back door is reinforced.