JPH0784133B2 - Car door structure - Google Patents

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a vehicle door structure, and more particularly to a structure for improving rigidity of an upper portion of a door body.

(Prior Art) In order to ensure the safety of passengers inside the vehicle when a front-back impact load is applied to the vehicle due to a frontal collision, etc.
As disclosed in Japanese Patent No. 54-3452, the upper member at the front of the vehicle body and the reinforcing structure of the door body are arranged at the same height,
A door structure designed to have strength continuity in the longitudinal direction of the vehicle has been devised. In this case, since the reinforcing structure of the door body has the same height as the upper member, it is formed near the door waist.

On the other hand, as the reinforcing structure of the door body, a frame structure having a closed cross section formed by welding a reinforcement to an outer panel or an inner panel forming the door body is preferable in order to improve the rigidity of the door body,
The frame structure with a closed cross section has also been started in Japanese Utility Model Publication No. 54-3452.

However, when the above frame structure is adopted, the rigidity of the door body can be improved to some extent by increasing the plate thickness of the reinforcement, but it is not possible to improve the rigidity of the outer panel or the inner panel. An extremely large thickness of the reinforcement will cause an imbalance in the stress distribution in the frame structure, which is unfavorable in terms of strength.On the other hand, the thickness of the outer panel or inner panel will increase to approach the thickness of the reinforcement. This results in an increase in the plate thickness of the outer panel or the entire inner panel including a portion that does not contribute to the configuration of the frame structure, which is not preferable because of the adverse effects such as an increase in vehicle weight and an increase in cost.

(Object of the Invention) The present invention has been made in view of the above circumstances, and provides a vehicle door structure capable of significantly improving the rigidity of the upper portion of the door body without using unnecessary materials. That is the purpose.

(Structure of the Invention) A door structure according to the present invention divides and forms at least one of an outer panel and an inner panel forming a door body into a thick upper panel and a thin lower panel, and
A reinforcement having a plate thickness approximately equal to that of the upper panel is joined to form a frame structure with a closed cross section, and the lower panel is joined to the frame structure to achieve the above object. It is a thing.

That is, in an automobile having a door body composed of an outer panel and an inner panel, at least one of the outer panel and the inner panel is divided into a thick plate upper panel and a thin plate lower panel, and the upper panel, With the upper panel coupled to the upper panel and the reinforcement having substantially the same plate thickness,
A frame structure having a closed cross section is formed, and the lower panel is joined to the frame structure.

The method for connecting the outer panel and the reinforcement and the method for connecting the frame structure and the lower panel are not limited to welding, hemming, bolting, and other specific methods. Further, whether the door structure is applied to both the outer panel side and the inner panel side or only one side may be appropriately selected in consideration of the strength balance with the vehicle body structure.

(Example) Hereinafter, an example of the present invention will be described in detail with reference to the accompanying drawings.

FIG. 1 is a side sectional view showing a vehicle door structure according to the present embodiment, and is a sectional view taken along line I-I of the door body 1 shown in FIG.

The door body 1 is composed of an outer panel 2 and an inner panel 3, and a window glass 4 is provided between the two panels so as to be vertically movable via a weather strip 5. The outer panel 2 is formed separately from a lower panel 6 made of a thin steel plate generally used for the outer panel and an upper panel 7 made of a steel plate thicker than the lower panel 6. A reinforcement 8 made of a steel plate having substantially the same thickness as that of the upper panel 7 is provided on the windshield 4 side of the upper panel 7 so as to extend in the vehicle front-rear direction. The upper panel 7 and the reinforcement 8 are located at two upper and lower positions. Are spot-welded together to form a frame structure having a closed cross section on the upper portion of the door body 1. When the spot welding is applied to the lower side portion, the upper end portion of the lower panel 6 is also welded at the same time, thereby forming the outer panel 2. A molding 9 for covering the traces and steps of spot welding and improving the appearance is formed at the joint between the frame structure consisting of the upper panel 7 and the reinforcement 8 of the outer panel 2 and the lower panel 6. The molding 9 is formed so as to extend in the vehicle front-rear direction along the portion, and the shape and size of the molding 9 so that the neck portion 9a of the molding 9 is slightly recessed from the surface extension lines of the upper panel 7 and the lower panel 6. Has been defined.

On the other hand, the inner panel 3 is made of a single steel plate 10, and a reinforcement 11 is provided on the upper side of the inner panel 3 on the side of the window glass 4 so as to extend in the vehicle front-rear direction. 11 is spot-welded at two locations on the upper and lower sides to form a frame structure having a closed cross section on the upper portion of the door body 1 by both.

FIG. 3 shows the upper panel 7 and the reinforcement 8
FIG. 3 is a perspective view showing an outer panel 2 in a state in which a frame structure made of and a lower panel 6 are spot-welded, a molding 9 attached to the outer panel 2 from the outside, and an inner panel 3 joined to the outer panel 2 from the inside. Is.

The molding 9 has a plurality of projections 12 formed on the back surface of the molding, and the projections 12 are formed in a plurality of holes formed in the outer panel 2.
By fitting on 13, the outer panel 2 is attached. The inner panel 3 is connected to the outer panel 2 by
This is done by fitting the outer panel 2 whose IVa portion is shown in detail in FIG. 4a, the inner panel 3 as shown in FIG. 4b, and performing hemming.

The door body 1 thus formed has, as shown in FIG. 1, a frame structure having a closed cross section above the outer panel 2 and the inner panel 3, respectively. Since the upper panel 7 having a large plate thickness and the reinforcement 8 are connected to each other, sufficient strength can be secured to protect an occupant in the passenger compartment against an impact load in the vehicle front-rear direction. . By making the frame structure above the inner panel 3 similar to the frame structure of the outer panel 2, the rigidity of the door body 1 can be further improved.

(Effects of the Invention) As described in detail above, in the vehicle door structure according to the present invention, at least one of the outer panel and the inner panel forming the door body is divided into a thick plate upper panel and a thin plate lower panel. At the same time, a reinforcement having a plate thickness approximately equal to that of the upper panel is joined to form a frame structure having a closed cross section, and the lower panel is joined to the frame structure. For the lower panel, select a material with a thickness that is generally used as an outer panel or an inner panel, while for the upper panel, together with the reinforcement, use a material with a thickness necessary to form a frame structure having a desired strength. Can be selected, thus significantly improving the rigidity of the upper part of the door body without wasting material. Therefore, the safety of the occupant in the vehicle interior at the time of a frontal collision can be further enhanced.

[Brief description of drawings]

1 is an enlarged sectional view taken along the line I-I of FIG. 2, showing a vehicle door structure according to the present invention, FIG. 2 is a side view showing a vehicle body of the vehicle having the door structure, and FIG. 3 is the door structure. 4a is an enlarged detailed view of IVa portion of FIG. 3, and FIG. 4b is a perspective view showing a combined state of an outer panel and an inner panel of the door structure. 1 ... Door body, 2 ... Outer panel, 3 ... Inner panel, 6 ... Lower panel, 7 ... Upper panel, 8 ... Reinforcement

Claims (1)

[Claims] 1. An automobile having a door body composed of an outer panel and an inner panel, wherein at least one of the outer panel and the inner panel is divided into a thick plate upper panel and a thin plate lower panel. By the panel and the reinforcement joined to the upper panel and the upper panel having substantially the same plate thickness,
A door structure for an automobile, wherein a frame structure having a closed cross section is formed, and the lower panel is joined to the frame structure.