JPS62175216A - Back door structure of automobile - Google Patents

Abstract

PURPOSE:To improve the extent of rigidity in a back door body, by forming each surface of upper and lower frames in the back door body with both upper and lower outer panels as well as forming an outer surface of a side frame with reinforcement. CONSTITUTION:A back door body 1 is formed by upper and lower frames 2 and 3 extending in a car width direction and symmetrical frames 4 connecting these upper and lower frames 2 and 3, while it is provided with a window opening part 5 at the central part, and a window glass 6 is attached to this body 1. In this case, in this body 1 there are provided with an inner panel 7 forming the whole inner surface of these frames 2-4, a reinforcement 8 continuously extending in each longitudinal direction of these frames 2-4 in opposition to the inner panel 7 and both upper and lower outer panels 9 and 10 forming each outer surface of these upper and lower frames 2 and 3. With this constitution, these upper and lower frames 2 and 3 form a closed cross section at each of these panels 7, 9 and 10.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a back door structure for an automobile.

(Prior Art) Conventionally, as a back door structure for an automobile, in order to enlarge the door window, the back door main body is connected to an upper frame and a lower frame extending in the vehicle width direction, and a left and right frame connecting the upper frame and the lower frame. It is known that the side frame is formed into a substantially rectangular frame shape (
(See Utility Model Application Publication No. 56-31917, etc.). In this case, the back door main body is formed by two panel members, namely an outer panel and an inner panel, forming a closed cross section extending in the longitudinal direction of each frame.

(Problems to be Solved by the Invention) However, since the width of each frame of the back door body is narrow, there is a problem in that sufficient rigidity cannot be ensured. In particular, the upper frame to which the hinge member is attached and the lower frame to which the lock member is attached are usually provided with reinforcing plates at the locations where the hinge member or lock member is attached within the closed cross section.
The reinforcing effect of this reinforcing plate cannot be said to be sufficiently good.
deformation may occur.

On the other hand, from a design perspective, there is a desire to freely change the shape of the outer surface of the upper frame and lower frame of the back door body, but in the conventional back door body, the entire outer surface of each frame Since it is composed of one panel member (outer panel), there are problems in terms of processing.

In order to solve this problem, in the above-mentioned publication (Utility Model Application No. 56-31917), the outer panel constituting the outer surface of the back door body is divided into each frame, and the divided panels are It has been proposed to combine and combine the following.

However, in this case, there are quite a lot of constituent members of the back door body (eight members including the lower frame and the reinforcing plate installed in the closed cross section of the lower frame), so the back door There is a problem that the citations in the main body become cumbersome.

-3= The present invention has been made in view of the above points, and its purpose is to improve the structure of the back door main body formed in the shape of a substantially rectangular frame as described above. While ensuring sufficient rigidity of the back door body, especially the lower frame and the lower frame to which the hinge member and lock member are attached, and making it easy to assemble the back door body, the shape of the outer surface of the upper frame d5 and the lower frame The original hemp of "Setting" 2 is raised to 1q luni.

<Means for Solving the Problems> In order to achieve the above object, the solving means of the present invention includes an upper frame and a lower frame extending in the vehicle width direction, and left and right side frames connecting and covering the upper frame and the lower frame. A back door structure for an automobile in which a back door body having a substantially rectangular frame shape is formed by the above is constructed as follows.

That is, at least one of the outer surfaces of the upper frame a3 and the lower frame is composed of an upper outer panel or a lower outer panel, and the back door main body has a substantially rectangular frame-shaped rain that extends continuously in the direction of each frame in A. The reinforcement member 1 comprises at least the outer surface of the side frame.

(Function) According to the configuration described in "-", in the present invention, the back door main body has the following features:
It consists of an inner panel that makes up the entire inner surface of each frame, an upper outer panel and a lower outer panel that make up the outer surfaces of the upper and lower frames, and a substantially rectangular frame-shaped reinforcement that extends continuously in the direction of each frame. Since the upper frame and the lower frame are entirely composed of the above three members, their rigidity can be increased.

Further, since the outer surfaces of the upper frame and the lower frame are composed of the upper outer panel or the lower outer panel that constitute only the outer surface thereof, the shape of the outer surface is not limited from a processing standpoint, and the shape setting This means that you will be able to improve your own mountain residence.

−5= Furthermore, the back door body has four parts as a whole.
If only one of the outer surfaces of the upper frame and the lower frame is composed of the upper outer panel or the lower outer panel, the assembly is relatively easy because it is composed of only three members. .

(Example) Embodiments of the present invention will be described below based on the drawings.

1 to 5 show a back door structure for an automobile as a first embodiment of the present invention, 1 is a back door main body, and the back door main body 1 includes an upper frame 2 extending in the width direction of the vehicle; A lower frame 3 and left and right side frames 4, 4 that connect the upper frame 2 and the lower frame 3.
It is formed into a substantially rectangular frame shape and has a window opening 5 in the center, and a back door window glass 6 is attached to the back door main body 1.

The back door main body 1 includes an inner panel 7 in the shape of a substantially rectangular frame that constitutes the entire inner surface of each frame 2, 3.4, and an inner panel 7 that extends in the longitudinal direction of each frame 2, 3. It consists of a reinforcement A-sement 8 in the shape of a substantially rectangular frame that extends continuously, and an upper outer panel 9 and a lower outer panel 10 that constitute the outer surfaces of the upper frame 2 and the lower frame 3, respectively. The upper frame 2 of the back door main body 1 has a closed section formed by an inner panel 7 and an upper outer panel 9, and a reinforcement 8 is provided within the closed section over the entire length of the upper frame 2 in the longitudinal direction (vehicle width direction). It is arranged as follows. Further, the lower frame 3 has a closed cross section formed by the inner panel 7 and the lower outer panel 10, and the reinforcement 8 is disposed within the closed cross section over the entire length of the lower frame 3 in the longitudinal direction. On the other hand, the side frame 4 has an outer surface formed by the reinforcement 8, and a cross section formed by the reinforcement 8 and the inner panel 7.

Note that the back door window glass 6 is attached to the back door main body 1.
Upper frame 2 and lower frame 33-7
= The outer surface of the odor (it is fixed with an adhesive or the like on the stepped portion 11 formed on the window opening 5 side of the outer panels 9 and 10, but the outer surface of A on the side frame 4 of the back door main body 1) (Reinforcement 8) is fixed on the outer surface so as to cover the whole from the outside.

Therefore, in the first embodiment, the upper frame 2 and the lower frame 3 of the bank door main body 1 each have a closed section formed by the inner panel 7 and the outer panel 9 or 10, and reinforcement is provided within the closed section. Since the members 8 are arranged over the entire length of each frame 2.3 in the longitudinal direction, the rigidity thereof and the rigidity of the back door main body 1 as a whole can be increased. Or lower frame 3
It is possible to reliably prevent deformation in the vicinity of the attachment portion of the lock member attached to the lock member.

Further, since the outer surfaces of the upper frame 2 and the lower frame 3 are composed of the upper outer panel 9 or the lower outer panel 10, which constitute only the outer surface thereof, the outer surfaces of each frame 2.3.4 of the back door main body 1 are 1 for the entire surface
The shape of the outer surface is not limited from a processing standpoint as in the case where the outer panel is configured with two outer panels, and the degree of freedom in shape setting can be increased.

Moreover, the back door main body 1 includes an inner panel 7, a reinforcement 9, and upper and lower outer panels 9.
, 10, it can be assembled relatively easily.

FIG. 6 shows an exploded state of a back door main body 1 according to a second embodiment of the present invention, in which the back door main body 1 uses an upper outer panel 9 in its upper frame 2 instead of using the upper outer panel 9 as in the first embodiment. The reinforcement 8' constitutes an outer surface, and the reinforcement 8' and the inner panel 7 constitute a closed cross section. Note that the structures of the lower frame 3 and side frame 4 of the back door main body 1 are the same as in the first embodiment, and a description thereof will be omitted.

In the case of the second embodiment, the back door main body 1
The rigidity, especially the rigidity of the upper frame 3, can be increased as in the case of the first embodiment, and the degree of freedom in setting the shape of the outer surface of the lower frame 3 can be increased while making it easier to assemble the back door main body 1. can be increased. Furthermore, since the back door main body 1 is composed of only three members, assembly can be made easier than in the first embodiment.

Further, FIG. 7 shows an exploded state of a back door body 1 according to a third embodiment of the present invention, and this back door body 1 uses a lower outer panel 10 in its lower frame 3 as in the first embodiment. Instead, the reinforcement 8'' constitutes the outer surface, and the reinforcement 8'' and the inner panel 7 constitute an open cross section. In the case of the second embodiment, the rigidity of the upper frame 2 can be increased as in the case of the first embodiment, and the outer surface of the upper frame 2 can be easily assembled. The degree of freedom in setting the shape can be increased, and assembly can be made easier than in the first embodiment.

(Effects of the Invention) As described above, according to the back door structure of an automobile according to the present invention, the back door main body having a substantially rectangular frame shape consisting of an upper frame, a lower frame, and left and right side frames is attached to the upper frame. The outer surface of the lower frame is constituted by an upper outer panel or a lower outer panel, and has a substantially rectangular frame-shaped reinforcement that extends continuously in the direction of each frame, and the reinforcement members 1 to 1 are used to control the side frames. Since the outer surface is structured, the rigidity of the back door body, particularly the rigidity of the upper frame or the lower frame, can be increased, and deformation in the vicinity of the hinge member and the lock part mounting part can be reliably prevented. Furthermore, it is possible to increase the degree of freedom in setting the shape of the outer surface of the upper frame or the lower frame while facilitating the assembly of the back door main body.

[Brief explanation of drawings]

The drawings show an embodiment of the present invention, and FIGS. 1 to 5 show the first embodiment, and FIG. 1 is a perspective view of the back door main body before the back window glass is attached, and
The figure is an exploded perspective view, and Figures 3, 4, and 5 are the first part of A3 with the bank door window glass installed.
FIG. 3 is an enlarged cross-sectional view taken along the line ■-■, the line Iv-IV, and the line Vv in the figure. FIG. 6 is a diagram equivalent to FIG. 2 showing the second embodiment, and FIG. 7 is a diagram equivalent to FIG. 2 showing the third embodiment. 1... Back door body, 2... Upper frame, 3...
...Lower frame, 8.8', 8''...Reinforcement, 9...Upper outer panel, 10...Lower outer panel.

Claims (1)

[Claims] (1) An automobile back door structure in which a substantially rectangular frame-shaped back door body is formed by an upper frame and a lower frame extending in the vehicle width direction, and left and right side frames connecting the upper frame and the lower frame. At least one of the outer surfaces of the upper frame and the lower frame is composed of an upper outer panel or a lower outer panel, and the back door main body has a substantially rectangular frame-shaped reinforcement that extends continuously in the direction of each frame. A back door structure for an automobile, characterized in that the reinforcement comprises at least an outer surface of a side frame.