JP2002019468A - Back door structure of automobile - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a back door structure of an automobile improved in the fitting strength of an exterior parts, and favorable in the aspect of the working efficiency. SOLUTION: An embossed part 7 reaching an outer panel 3 side is formed on an inner panel 2. Since a bolt 6 of a finisher 4 is tightened to a top 8 of the embossed part 7, the collision load can be distributed not only to the outer panel 3 but also to the inner panel 2 even when the collision load, etc., is applied to the finisher 4, and the fitting strength of the finisher 4 is improved thereby.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a vehicle back door structure.

[0002]

2. Description of the Related Art A back door of an automobile is formed in a hollow structure with an inner panel and an outer panel, and a finisher (exterior product) made of synthetic resin is attached to the outer panel. The finisher is provided with a plurality of bolts (fastening members) in a protruding state in advance. After inserting the bolts into the mounting holes of the outer panel, a nut is inserted from an opening formed at a corresponding position of the inner panel. Is fastened to the bolt from inside the vehicle using a tool.

[0003]

However, in such a conventional technique, since the finisher is mounted only on the outer panel, it is difficult to obtain the mounting strength of the finisher, and a collision load is applied to the finisher. In such a case, the back door may be easily deformed. Therefore, it is necessary to increase the thickness of the outer panel or to add a reinforcing material as a countermeasure, which leads to an increase in the weight of the vehicle body.

[0004] Further, since the operation of fastening the nut to the bolt of the finisher that has penetrated the outer panel is performed through an opening formed in the inner panel, if the nut is dropped during the operation, the nut is removed from the inner panel and the outer panel. And fall into the hollow space between them. It is very difficult and time-consuming to collect the nuts that have fallen into the hollow part, which significantly reduces the working efficiency.

Further, since the opening is formed in the inner panel, the strength of the inner panel is reduced, and the edge of the opening is edged, which is not preferable in terms of work safety.

The present invention has been made by paying attention to such a conventional technique, and provides a back door structure of an automobile in which the mounting strength of exterior parts is improved and the working efficiency is also advantageous. .

[0007]

According to the first aspect of the present invention,
A back door having a hollow structure is formed by the inner panel and the outer panel, and a plurality of fastening members protruding from the exterior product are fastened to the back door by work from the inside of the vehicle, so that the exterior product is attached to the outer panel of the back door. A back door structure of a vehicle which is mounted from the outside of the vehicle, wherein an embossed portion reaching the outer panel is formed at a portion corresponding to a fastening member of the inner panel, and an exterior is provided on a top portion of the embossed portion. The fastening member of the product is fastened.

According to the first aspect of the present invention, an embossed portion reaching the outer panel is formed on the inner panel, and a fastening member of the exterior component is fastened to the top of the embossed portion. However, the impact load can be dispersed and transmitted not only to the outer panel but also to the inner panel, and the mounting strength of the exterior component is improved. Also, since the fastening member of the exterior part is located inside the embossed part, even if the part used for fastening falls off during work, the part is inside the embossed part, so it is easy to work again Therefore, the working efficiency is not reduced. Further, by forming the embossed portion on the inner panel, the strength of the inner panel itself is increased, which contributes to an increase in the strength of the entire back door. In addition, since the entrance of the embossed portion is not edged, it is preferable from the viewpoint of work safety.

In the invention according to claim 2, the inner panel is formed of a synthetic resin.

According to the second aspect of the present invention, since the inner panel is formed of a synthetic resin, the embossed portion can be easily formed integrally by injection molding.

According to the third aspect of the present invention, the top of the embossed portion is joined to the outer panel.

According to the third aspect of the present invention, since the top of the embossed portion is joined to the outer panel, the overall strength of the embossed portion is further improved. Further, by joining the embossed portion and the outer panel, it is possible to prevent the outer panel from being lifted up with respect to the embossed portion of the outer panel, and to easily perform a work of penetrating the fastening member to the top of the embossed portion.

According to the fourth aspect of the present invention, an opening is formed in the outer panel to which the top of the embossed portion is joined, and the center of the top is exposed from the opening.

According to the fourth aspect of the present invention, since the top of the embossed portion is exposed from the opening, it is only necessary to penetrate the exterior member through only one top of the fastening member. Workability is better than when penetrating two outer panels.

According to a fifth aspect of the present invention, the central portion at the top of the embossed portion is raised inside the opening, and the central portion is flush with the outer panel.

According to the fifth aspect of the present invention, since the central portion at the top of the embossed portion and the outer panel are flush with each other, the contact area of the exterior component around the fastening member increases, and a collision load or the like is applied. Local deformation around the fastening member is prevented.

[0017]

1 to 4 show an embodiment of the present invention.
It will be described based on. In the following, the arrow A in the figure
The direction is described as the vehicle outside (rear side), and the direction of arrow B is described as the vehicle inside (front side).

At the rear of the vehicle, there is provided a back door 1 which can be opened upwards around a hinge (not shown) provided at the upper edge. The back door 1 is formed in a hollow structure from an inner panel 2 made of synthetic resin and an outer panel 3 made of metal. The lower portion of the outer panel 3 is formed one step lower on the inner panel 2 side, and a finisher (exterior product) 4 is attached to the lower portion from the outside of the vehicle. The finisher 4 is shaped so as to enter the bumper 5 and has the same surface as the bumper 5. The finisher 4 has an open cross-sectional structure in which the inside of the vehicle is open, and four bolts (fastening members) are provided above and below the opener, respectively.
6 is attached in advance in a state of protruding toward the inside of the vehicle.

At a portion corresponding to the bolt 6 of the inner panel 2, a cylindrical embossed portion 7 is formed in advance. The top 8 of the embossed portion 7 is in a closed state,
The base end is open to the inside of the vehicle. Since the inner panel 2 is made of synthetic resin, such an embossed portion 7
Can be easily formed by injection molding. A circular opening 9 is formed in the outer panel 3 corresponding to the top 8 of the embossed portion 7. The opening 9 exposes only the central portion 10 at the top 8 of the embossed portion 7 and the central portion 1
The tops 8 other than 0 are joined around the opening 9.

The central portion 10 is provided on the outer panel 3.
The central portion 10 and the outer panel 3 are flush with each other. And this central part 10
Is formed with a mounting hole h. Further, the lower end of the inner panel 2 protrudes below the lower end of the outer panel 3, and a similar mounting hole h is formed there along the vehicle width direction.

Then, the bolts 6 of the finisher 4 are inserted into the corresponding mounting holes h, and the nut 11 is fastened from the inside of the vehicle using a tool, so that the finisher 4 is mounted. Since the top 8 is exposed from the opening 9,
The workability is good because only one of the tops 8 of the bolt 6 needs to be penetrated using the mounting hole h. That is, if the opening 9 is not formed, the mounting hole h must be formed in the outer panel 3 and the bolt 6 must be passed through the two mounting holes h. As a result, workability is improved.

When the nut 11 is fastened to the bolt 6, even if the nut 11 comes off, the nut 11 is inside the embossed portion 7, so it is easy to perform the work again, and the work efficiency is reduced. Do not let. Further, since the fastening of the nut 11 at the lower end of the inner panel 2 is originally an open space, even if the nut 11 is dropped, the nut 11 can be picked up and re-worked immediately. In addition, since the entrance of the embossed portion 7 is not edged, it is preferable from the viewpoint of work safety.

Even if a collision load or the like is applied to the finisher 4 mounted in this way, the collision load can be dispersedly transmitted not only to the outer panel 3 but also to the inner panel 2, so that the mounting strength of the finisher 4 is high, The back door 1 does not easily deform. Further, by forming the embossed portion 7 on the inner panel 2, the strength of the inner panel 2 itself is increased, which contributes to an increase in the strength of the entire back door 1.

Furthermore, the fact that the portion of the embossed portion 7 other than the central portion 10 is joined to the outer panel 3 also contributes to the increase in the strength of the back door 1 as a whole. The fact that the embossed portion 7 and the outer panel 3 are joined
Outer panel 3 with respect to embossed portion 7 of outer panel 3
Of the bolt 6 is also prevented, and the work of inserting the bolt 6 into the mounting hole h is facilitated.

Further, when the finisher 4 is mounted, the central portion 10 at the top 8 of the embossed portion 7 is provided.
Because the outer panel 3 and the outer panel 3 are flush with each other, the contact area of the finisher 4 around the bolt 6 increases, and local deformation around the bolt 6 when a collision load or the like is applied is prevented.

[0026]

According to the present invention, the inner panel is formed with the embossed portion reaching the outer panel side, and the fastening member of the exterior component is fastened to the top of the embossed portion. However, the collision load can be dispersedly transmitted not only to the outer panel but also to the inner panel, and the mounting strength of the exterior component is improved. Also, since the fastening member of the exterior part is located inside the embossed part, even if the part used for fastening falls off during the work, the part is inside the embossed part, so it is necessary to work again. Easy and does not reduce work efficiency. Further, by forming the embossed portion on the inner panel, the strength of the inner panel itself is increased, which contributes to an increase in the strength of the entire back door. In addition, since the entrance of the embossed portion is not edged, it is preferable from the viewpoint of work safety.

[Brief description of the drawings]

FIG. 1 is a perspective view showing a back door according to an embodiment of the present invention.

FIG. 2 is an exploded perspective view of the back door of FIG. 1 and a finisher attached to the back door.

1. FIG. 3 is a partially broken perspective view showing an embossed portion of the back door of FIG.

FIG. 4 is a sectional view showing an embossed portion of the back door of FIG. 2;

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Back door 2 Inner panel 3 Outer panel 4 Finisher (exterior product) 5 Bumper 6 Bolt (fastening member) 7 Embossed part 8 Top part 9 Opening 10 Center part 11 Nut A Outer side B Inner side h Mounting hole

Claims (5)

[Claims] 1. A back door having a hollow structure is formed by an inner panel and an outer panel, and a plurality of fastening members protruding from the exterior component are fastened to the back door by a work from the inside of the vehicle, whereby the exterior component is formed. A back door structure of an automobile which is attached to an outer panel of a back door from an outside of a vehicle, wherein an embossed portion reaching an outer panel side is formed in a portion corresponding to a fastening member of the inner panel, and the embossed portion is formed. A fastening member for an exterior component is fastened to the top of the vehicle. 2. The back door structure for an automobile according to claim 1, wherein the inner panel is formed of a synthetic resin material. 3. The back door structure for a vehicle according to claim 1, wherein a top portion of the embossed portion is joined to the outer panel. 4. The back door structure for an automobile according to claim 3, wherein an opening is formed in the outer panel to which the top of the embossed portion is joined, and a center of the top is exposed from the opening. Car back door structure. 5. The back door structure for an automobile according to claim 4, wherein a central portion at the top of the embossed portion is raised inside the opening, and the central portion is flush with the outer panel. Car back door structure.