JPS6251708B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a joining structure for outer panels of a vehicle body such as an automobile.

In general, when constructing the outer panels of a vehicle body such as an automobile, plates are press-formed in several parts, for example, a first plate and a second plate are butted together at necessary locations and along the joints. Welding is carried out. For example, a joint between a roof panel and a rear quarter panel is provided in the side wall portion extending along both sides of the rear window of a general passenger car, and the two are joined by butt welding along the joint. . Such a joint structure is required to have sufficient strength and to form a beautiful continuous curved surface without creating any steps or discontinuities in the curved surface so that it is not noticeable in appearance.

Therefore, in order to meet such requirements, conventionally, as shown in Japanese Patent Publication No. 52-50020, a first plate material and a second plate material were used.
Butt the edges of the plate, and place a backing material on the back side with a width that spans the joint.
In addition, a joint structure for car body outer panels has been proposed in which the backing material has a certain degree of freedom in the perpendicular direction and the two are butt-welded along the joint, but this joint structure does not meet the above-mentioned requirements. Although the required strength and aesthetic appearance were achieved, a separate backing material was required, resulting in an increase in the number of parts.

The present invention has been made in view of these points, and by configuring the backing material from a portion of one of the plate materials to be joined, the above requirements, that is, strength and beautiful appearance, can be achieved without increasing the number of parts. The present invention provides a joining structure for vehicle body outer panels that can ensure safety.

That is, the present invention provides a joint structure of a vehicle body outer panel in which a first plate material and a second plate material are butted together and welded along the joint, in which the joint is made with one edge by a substantially U-shaped cut in one of the plate materials. A window is opened, and both sides of the window are stepped along the seam, and the edge of the other board faces one edge of the window and the next step. , the above-mentioned one plate material is bent into the interior of the vehicle body at both sides of the window, and the U-shaped cut tongue piece formed by the above-mentioned cut is bent at its end to straddle the joint, and the end part is bent into the vehicle body at both sides of the window. It is welded to the back surface of one side of one edge, and at the center of the seam, both plates are butt welded using the above-mentioned cut tongue as a backing material, and on both sides of the seam, the serration step of one plate is welded. The other plate material is butt welded to the other plate material.

Hereinafter, the present invention will be described in detail based on embodiments shown in the drawings.

1 to 3 show a case in which the present invention is applied to a joint structure between a rear quarter panel and a roof panel of an automobile, where 1 is a rear quarter panel, 2 is a roof panel, and the rear quarter panel 1 is connected to the rear quarter panel 1. A U-shaped window 3 with the seam 1 as one edge is opened by a substantially U-shaped cut, and a depth corresponding to the thickness of the roof panel 2 is provided on both sides of the window 3 along the seam 1. A butting edge where the edge 2a of the roof panel 2 is abutted by one edge 3a of the window 3 and the succeeding edge 4, in which stepped baffles 4, 4 are formed. In addition, both side portions 5, 5 of the window 3 of the rear quarter panel 1 are bent into a dogleg shape in cross section into the vehicle body, and have a U-shaped notch tongue piece formed by the notch. 6 is bent at its lower end 6a so as to straddle the seam 1, and is formed so that the lower end edge of the cut tongue 6 reaches and comes into contact with the back surface of one side of the window 3 on the side 3a. It is temporarily joined to the back surface of one side of the window 3 on the one edge 3a side by spot welding or the like. That is, the cut tongue piece 6 forms the oblique side of the triangle with respect to the side parts 5, 5 of the window 3, which form the two sides of the triangle in its cross-sectional shape, and its lower edge forms one side of the window 3. It faces downward from the edge 3a and comes into contact with the back surface of one side thereof. Incidentally, reference numeral 7 designates a notch portion formed by cutting out the side edge of the notch tongue piece 6 in order to prevent the notch tongue piece 6 from interfering with the one side portion 5 of the window 3 during the bending process.

Then, with respect to the rear quarter panel 1 formed as described above, the lower edge 2 of the roof panel 2 is exposed to one edge of the window 3 and the edge step 4, and the two are joined by butt welding 8. , at the center of the seam l, as shown in FIG.
(lower end 6a) is used as a backing material, and the two are butt welded on top of that.
As shown in FIG. 3, the roof panel 2 is butt-welded to the serration step 4 of the rear quarter panel 1. Although not shown, the upper end line of the rear quarter panel 1 is welded to the roof side inner panel.

Therefore, in the above embodiment, the window 3 is formed by a substantially U-shaped notch provided in the rear quarter panel 1.
The roof panel 2 is butted against one edge and the following baffle step 4, and at the center of the seam l, the cut tongue piece 6 formed by the above-mentioned notch is used as a backing material, and the roof panel 2 is butted along the seam l. By welding together, sufficient strength of the joint can be ensured by the backing material formed by the cut tongue piece 6, and the appearance of the joint can be made continuous without creating any steps or discontinuities in the curved surface. It can be beautifully finished to form a curved surface, and since a part of the rear quarter panel 1 (cut tongue piece 6) is used as the backing material, the number of parts does not increase.

Furthermore, the notching of the window 3 provided in the rear quarter panel 1 and the bending of the both side portions 5 of the window 3 and the notched tongues 6 may be carried out simultaneously with the forming of the rear quarter panel 1 or before or after the forming process of the rear quarter panel 1 by simple sheet metal processing. Since the process can be carried out using a single process, the molding process can be easily performed.

In the above explanation, the joint structure between the rear quarter panel 1 and the roof panel 2 has been described, but it goes without saying that the present invention can also be applied to any other part of the outer panel of an automobile body that should be joined. .

As explained above, according to the present invention, in the joint structure of a vehicle body outer plate in which a first plate material and a second plate material are butted together and welded along the joint, a substantially U-shaped cut is made in one plate material. A window is opened with the seam as one edge, and both sides of the window are stepped along the seam, and one edge of the window and the following step are provided with a window on the other side. The edges are facing, and the one board is bent into the vehicle body at both sides of the window, and the U-shaped cut tongue formed by the cut is bent at its end to straddle the joint. This end is welded to the back side of one edge of the window, and at the center of the joint, both plates are butt welded using the cut tongue piece as a backing material, and on both sides of the joint, one side is welded. By butt welding one plate to the other plate,
Since it is possible to sufficiently secure the strength and aesthetic appearance of the joint portion of the outer skin of the vehicle body without increasing the number of parts, it is possible to provide a joining structure of the outer skin of the vehicle body that is low in cost and excellent in practical use. can.

[Brief explanation of the drawing]

The drawings illustrate embodiments of the present invention, with FIG. 1 being an exploded perspective view, and FIGS. 2 and 3 being vertical sectional side views of the center and side of the joint in a joined state, respectively. DESCRIPTION OF SYMBOLS 1... Rear quarter panel, 2... Roof panel, 2a... Lower edge, 3... Window, 3a... One edge, 4... Segi step, 5... Both sides of window, 6...
...Notch tongue piece, 6a...lower end, 8...butt weld, l...seam.

Claims (1)

[Claims] 1. In a vehicle body outer panel joint structure in which a first plate material and a second plate material are butted together and welded along the joint, a window with the joint as one edge is made in one plate material by a substantially U-shaped cut. Both sides of the window are stepped along the seam, and the edge of the other board faces one edge of the window and the next step; is bent toward the inside of the vehicle body at both sides of the window, and the U-shaped cut tongue formed by the cut is bent at its end to straddle the joint, and the end is on one edge side of the window. It is welded to the back surface of one side part, and at the center of the joint, both plates are butt welded using the above-mentioned cut tongue as a backing material, and on both sides of the joint, the other plate is attached to the serration step of one plate. A joint structure for car body outer panels characterized by butt welding.