JPS642814Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to an improvement in the structure of the top rail portion of a back door of an automobile, and more specifically, to a back door that can be easily assembled even if the width of the top rail is narrowed.

As shown in Figure 1, the structure of the top of the back door in a car with a top attached to the cargo platform was conventionally
It was generally configured as shown in the figure.
That is, at the top of each of the outer panel a and the inner panel b, there is a top rail c having a substantially inverted U-shaped cross section.
It was fixed in a hanging shape. In this configuration, an assembly method is adopted in which the rear downward extension d of the top rail c is first spot welded to the outer panel a at a position e, and then the front downward extension f is spot welded to the inner panel b at a position g. . In this case, there is no problem in fixing the top rail c to the outer panel a, that is, using the welding gun to sandwich the portion e, but it is easy to fix the top rail c to the inner panel b, i.e. , in order to operate the welding gun so as to sandwich part g, the eighth
As shown in the figure, it is necessary to make a hole i in the inner panel b for inserting a part of the welding gun h into the back space of the inner panel b. This means that after welding the part g, it is necessary to take measures to seal the hole i, and a slight decrease in strength cannot be avoided. Also, when narrowing the width j of the top rail c,
It is possible to take special measures such as making the hole i larger or giving the welding gun a special shape so that the tip of the welding gun can be successfully guided to a predetermined location. It becomes necessary.

As described above, in the conventional structure of this type of automobile back door, there are difficulties in assembly workability, particularly in the workability and strength of spot welding between the top rail and the inner panel, which are fixed in advance to the outer panel, and improvements are needed. It was wanted.

The present invention has been devised in view of the above, and aims to provide a back door with a new structure that can improve assembly workability and strength.

In order to achieve this purpose, the present invention takes the following technical measures. That is, a bracket having a roughly L-shaped or V-shaped cross section is welded to the shoulder formed by bending the upper part of the inner panel of the back door, and to this the inner edge of the top rail, which has been welded to the outer panel in advance, is It was decided to bolt them together.

By doing so, the following effects can be obtained. In other words, while spot welding the top rail to the outer panel and welding the bracket to the inner panel can be done by applying a welding gun to a predetermined area without any problem, the final outer panel and inner Integration with the panel is done by bolting the inner edge of the top rail to the bracket, so when spot welding the top rail and inner panel as in the past, a welding gun is inserted into the inner panel. This eliminates the need to drill a hole for the welding gun, to form the welding gun into a special shape, or to insert the welding gun through the hole and guide it into position within a narrow space. Assembling workability is improved and manufacturing costs can be reduced. In addition, in the conventional example, it was necessary to make a hole in the inner panel for inserting a spot welding gun.
There was also a difficulty in terms of strength, but this invention eliminates the need for this, and the upper part of the inner panel is bent inward, and the shoulder formed by this is approximately L-shaped or approximately V-shaped. Since the ribs formed on the back surface of the inner panel by welding the shaped brackets increase the rigidity of the inner panel, the strength of the back door is dramatically improved compared to the conventional example.

Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the drawings.

FIG. 2 is an exploded perspective view of the constituent members of the back door according to the present invention, in which 1 is an outer panel, 2 is an inner panel, 3 is a top rail, and 6 is a bracket. When these are combined, FIG. The back door 5 shown in is completed.

The top rail 3 has a top flat part 3a, an inner edge 3
b and an outer edge 3c, the member has a substantially inverted U-shaped cross section.The inner edge 3b is connected and fixed to the upper edge of the inner panel 2, and the outer edge 3c is connected and fixed to the upper edge of the outer panel 1. form the top of

The connection between the outer edge 3c and the outer panel 1 is made by the seventh
As shown in the figure, this is done by overlapping these parts and spot welding these parts.

On the other hand, the inner edge 3b and the inner panel 2 are connected through a bracket 6 fixed to the upper part of the inner panel 2. The upper part of the inner panel 2 is
A shoulder portion 7 is formed by bending, and a bracket 6 having a substantially L-shaped or V-shaped cross section is fixed to this portion by spot welding its diagonal pieces 6a at a plurality of locations (see Fig. 6). The inner edge 3b of the top rail 3 connected to the outer panel 1 is fixed to the upright piece 6b with bolts 8 at a plurality of locations. Note that a hole (not shown in the figure) is pre-drilled in the upright piece 6b of the bracket 6, and a nut 9 is fixed to the back surface of the hole by projection welding, etc., so that a screw for screwing the bolt 8 is formed. Make a hole (not shown in the diagram).

In this embodiment, the bracket 6 is designed as follows to facilitate assembly.

That is, as shown in FIGS. 2 and 4, the nut 9 of the upright piece 6b on the diagonal piece 6a
First notch 1 in the part opposite to the part to be fixed.
0, and on the other hand, the diagonal piece 6a in the upright piece 6b
A second notch 11 is provided at a portion of the inner panel 2 opposite to the portion to be welded. The first notch 10 was provided because, as shown in FIG. This is to make it possible to pass 10.
Thereby, even if the bracket 6 has a substantially V-shaped cross section as in this embodiment, the nut 9 can be welded to the back surface of the upright piece 6b without any problem.
On the other hand, the second notch 11 is provided when the welding gun S is used to spot weld the diagonal piece 6a of the bracket 6 to the shoulder portion 7 of the inner panel 2, as shown in FIG. This is so that it can pass through the two notches 11. Thereby, even if the bracket 6 has a substantially V-shaped cross section, the diagonal piece 6a can be welded to the shoulder portion 7 near its base without any problem, without changing the shape of the welding gun.

Thus, the bracket 6 is spot welded to the inner panel 2 as shown in FIG. 6, while the top rail 3 is spot welded to the outer panel 1 as shown in FIG. 7, and finally, as shown in FIG. By fixing the upright piece 6b of the bracket 6 and the inner edge 3b of the top rail 3 with bolts 8, the assembly of the top rail portion of the back door 5 is completed. As is clear from this, in the present invention, unlike the conventional example, the difficulty in welding work of drilling a hole in the inner panel and inserting a welding gun through the hole to spot weld the top rail and the inner panel is eliminated. It disappears completely.

The scope of the invention is not limited to the embodiments shown in the drawings. For example, the shoulder portion provided on the inner panel may be bent at a right angle, while the bracket may have an L-shaped cross section. The point of the present invention is that, instead of directly spot welding the top rail and the inner panel, the top rail and the top rail are connected by bolting through a bracket fixed to the top rail.

As described above, the present invention allows the top rail of the back door to be attached very easily without the need for the difficult work of drilling a hole in the inner panel or inserting a welding gun through the hole as in the conventional example. It has the unique effect of being easy to assemble and increasing the strength of the back door.

[Brief explanation of the drawing]

FIG. 1 is a perspective view showing an example of an automobile equipped with a back door according to the present invention, FIG. 2 is a perspective view showing an embodiment of the back door according to the present invention with its components disassembled, and FIG. FIG. 2 is a perspective view showing the assembled state of the parts; FIG. 4 is a sectional perspective view of the main parts of the above embodiment; FIGS. 5 to 7 are sectional views showing the assembly order and operation; FIG. 8 is a sectional view showing a conventional example. 1...Outer panel, 2...Inner panel, 3
...Tots Play Rail, 3b... (Tots Play Rail)
Inner edge, 3c... Outer edge (of top rail), 5
...back door, 6...bracket, 7...shoulder, 8...bolt.

Claims (1)

[Scope of utility model registration request] A bracket with a roughly L-shaped or V-shaped cross section is spot welded to the shoulder formed by bending the upper part of the inner panel of the back door, and the outer edge of the top rail, which has a roughly inverted U-shaped cross section, is spot welded to the top of the outer panel. A structure of a top rail portion of a back door of an automobile, characterized in that inner edges of the bracket and the top rail are fixed to each other with bolts.