JPH07251760A - Rear floor panel construction - Google Patents

Abstract

PURPOSE:To secure the strength of rear floor parts and that of rear wheel housing parts without increasing weight, cost and the complexity of assembling operations by press molding a blank which is obtained when the plates of wheel housing parts are butt welded to plates forming the rear floor parts. CONSTITUTION:A rear floor panel has a rear floor part 2 and right 3 and left 4 rear wheel housing parts which are formed outside the right and left of the rear floor part 2 and thicker than the rear floor part 2. A blank, which is obtained when plates forming the wheel housing parts 3, 4 are butted against and welded continuously with plates forming the right and left rear floor parts 2a, 2b, is press molded to form right 1a and left 1b side parts. The right and left side parts 1a, 1b are spot welded to each other at a welding part 1c halfway between them, and rear floor frames 6, 7 are coupled to the lower surface of the rear floor part 2. Since the plates are continuously welded together, operations are facilitated and junction strength can be secured.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a rear floor panel structure for an automobile body.

[0002]

2. Description of the Related Art A rear floor panel 11 forming a rear floor portion has a rear floor portion 12 and left and right rear wheel house portions 13, 14. Conventionally, as shown in FIG. 5, a rear floor portion 12 and a rear wheel house portion 13, 1
4 is a member formed by press-molding another panel having a different wall thickness, and as shown in FIG. 6, the flange 12a of the rear floor portion 12 and the flange 13a of the rear wheel house portion 13 are formed.
There were also those in which the flanges 12b and 14a were similarly spot-welded, and those in which the rear floor portion and the rear wheel house portion were integrally formed.

[0003]

However, when spot welding the rear floor portion 12 and the rear wheel house portions 13, 14 to each other, the shape of each member and the welding surface is complicated, and not only the work is difficult, but also the work is difficult. Since it may not be possible to secure sufficient joint strength by itself, it is necessary to apply structural adhesive to the spot flange surface in order to improve the strength, which increases the assembly man-hours in combination with the welding man-hours. was there.

The above problem can be solved by integrally molding the rear floor portion and the rear wheel house portion, but since the wheel house portion has the same thickness as the rear floor portion, the sound from the rear tire is generated. It is necessary to separately attach a soundproof material such as a so-called mel sheet in order to reduce the invasion of the rear floor panel. Needless to say, thickening the entire rear floor panel is not practical because it increases weight.

In addition, there are restrictions on the press forming of the drawing depth of the spare tire storage part on the rear floor part and the wheel house part, and it is not possible to cope with those with a large drawing depth. There is no choice but to narrow the angle of squeezing, and the spare tire storage area becomes substantially larger. Then, in order to secure the spot flange surface of the rear floor frame that is connected to the lower part of the rear floor part, it is necessary to offset this rear floor frame to the left and right outside of the position where it is originally arranged, and also the angle of squeezing the wheel house part. Since it will be shallow, it will be difficult to pass the rear floor frame between the spare tire storage part and the wheel house part where they are formed together, and it must actually be bent, in order to prevent the strength decrease due to them. In addition, since the offset portion needs to be reinforced, weight and cost increase become more serious problems.

The present invention has been made in view of the above-mentioned problems of the prior art, and its main purpose is to increase weight, increase cost, and complicate assembly work. It is to provide a rear floor panel structure that can secure the strength of a part.

[0007]

SUMMARY OF THE INVENTION The above object is to provide a rear floor panel structure having a rear floor portion and a rear wheel house portion that is thicker than the rear floor portion and that projects toward the passenger compartment to accommodate rear tires. It is achieved by providing a rear floor panel structure characterized by being formed by press-molding a blank material formed by butt-welding the plate material forming the wheel house portion to the plate material forming the rear floor portion. . In particular, the left and right separate plate materials that should form the rear floor section and the plate material that should form the rear wheel house section are press-formed by continuously joining them by high-density energy beams such as laser welding and plasma welding with a small heat-affected range, After that, it is even better if the left and right panels are spot welded at the center to form the rear floor panel.

[0008]

The plate material forming the rear floor portion and the plate material forming the rear wheel house portion having different plate thicknesses are butt-welded in advance with each other, and the blank material is press-molded so that each part has an appropriate wall thickness, and the desired thickness is obtained. The strength can be secured and the weight is not increased more than necessary. In addition, the plate material forming the rear floor part is composed of left and right plate materials, the plate material forming the rear wheel house part is butt welded to each plate material in advance, and after press molding, the left and right panels are spot welded at the center part. By forming the rear floor panel, the restrictions on press molding are relaxed, the left and right panels can be deep-drawn during press molding, and even when the drawing depth is large, the rear floor frame to be mounted afterwards can also be positioned at the desired position. Can be placed in

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENT A preferred embodiment of the present invention will now be described in detail with reference to the accompanying drawings.

FIG. 1 is a perspective view showing a rear floor panel to which the present invention is applied with a part thereof omitted, and FIG.
FIG. 7 is a cross-sectional view taken along line II. Rear floor panel 1
Has a rear floor portion 2, and a right rear wheel house portion 3 and a left rear wheel house portion 4 which are formed on the left and right outer sides of the rear floor portion 2 and are thicker than the rear floor portion 2. In addition, a spare tire storage portion 5 is formed in a substantially central portion of the rear floor portion 2. Further, rear floor frames 6 and 7 extending in the front-rear direction are coupled to the left and right outer sides of the spare tire housing portion 5 on the lower surface of the rear floor portion 2. Further, in this embodiment, the rear floor panel 1
Connects the right side portion 1a and the left side portion 1b to the central welded portion 1
It is formed by spot welding at c. That is, the right side portion 1a includes the right side rear floor portion 2a and the right side rear wheel house portion 3, and the left side portion 1b includes the left side rear floor portion 2b and the left side rear wheel house portion 4.

Actually, the right side portion is obtained by press-forming a blank material formed by abutting the respective plate materials forming the wheel house portions 3 and 4 against the respective plate materials forming the left and right rear floor portions 2a and 2b and continuously welding them with a high density energy beam. 1a
And a left side portion 1b is formed. The right part 1 in FIG.
The blank material 8 before press forming which comprises a is shown. By press-molding the blank material 8, the portion 8a forms the right rear floor portion 2a, and the portion 8b forms the right wheel house portion 3. Since the same applies to the left side portion 1b, detailed description thereof will be omitted. The press-formed right side portion 1a and left side portion 1b are spot-welded at the central welded portion 1c, and rear floor frames 6 and 7 are joined to the lower surface of the rear floor portion 2 to complete the rear floor panel 1.

Here, by performing continuous welding as described above, the required joint strength between the rear floor portion and the wheel house portion can be secured, and it is not necessary to separately apply a structural adhesive, and further flat plate Since they are welded to each other, the work is easy and the workability of assembly is improved as a whole.

Further, as shown in FIG. 4 which is a view taken along the line IV-IV of FIG. 1, the rear floor panel 1 is formed by spot welding the right side portion 1a and the left side portion 1b at the central welded portion 1c. This makes it possible to secure the flange part for mounting the rear floor frame inside compared to the case where the rear floor part and the rear wheel house part are integrally molded (imaginary line), and the wheel house part does not get in the way. There is no need to bend. Therefore, the strength can be secured without separately providing a reinforcing material.

In this embodiment, the rear floor panel 1 is
Right side portion 1a spot welded at the central welded portion 1c
Although the rear floor panel is composed of one panel and the left and right sides of the rear floor panel are continuously welded with the plate material forming the rear wheel house, a blank material may be press-molded.

[0015]

As is apparent from the above description, according to the rear floor panel structure of the present invention, the plate material forming the rear floor portion and the plate material forming the rear wheel house portion having different plate thicknesses are butt welded to each other in advance. By press-molding this blank material, each part has an appropriate thickness without increasing the number of steps, the desired strength can be secured, and the weight is not unnecessarily increased. In addition, the plate material forming the rear floor part is composed of left and right plate materials, the plate material forming the rear wheel house part is butt welded to each plate material in advance, and after press molding, the left and right panels are spot welded at the center part. If you make a rear floor panel,
Since the restrictions on press molding are relaxed, the left and right panels can be deep-drawn during press molding, and even if the drawing depth is large, the rear floor frame to be mounted after that can be placed at a desired position, so a separate reinforcement is provided. The strength can be secured without increasing the weight, and further weight reduction can be suppressed.

[Brief description of drawings]

FIG. 1 is a perspective view showing a rear floor panel to which the present invention is applied with a part thereof omitted.

FIG. 2 is a sectional view taken along line II-II in FIG.

FIG. 3 is a plan view showing a blank material formed by butting and welding a plate material forming a wheel house portion to a plate material forming a rear floor portion.

FIG. 4 is a sectional view taken along line IV-IV in FIG.

FIG. 5 is a perspective view showing a conventional rear floor panel with a part thereof omitted.

6 is a sectional view taken along line VI-VI in FIG.

[Explanation of symbols]

 1 Rear floor panel 1a Right side part 1b Left side part 1c Central welded part 2 Rear floor part 2a Right side rear floor part 2b Left side rear floor part 3 Right side rear wheel house part 4 Left side rear wheel house part 5 Spare tire storage part 6, 7 Rear floor frame 8 Blank material 8a Rear floor Part forming part 8b Part forming wheel house 11 Rear floor panel 12 Rear floor part 13, 14 Rear wheel house part 12a, 12b, 13a, 14a Flange

Claims (2)

[Claims] 1. A rear floor panel structure having a rear floor portion and a rear wheel house portion that is thicker than the rear floor portion and protrudes toward a passenger compartment for housing rear tires, wherein a plate material forming the rear floor portion is provided. A rear floor panel structure, which is formed by press-molding a blank material obtained by butt welding the plate materials that form the wheel house portion. 2. The plate material that forms the rear floor portion is made of left and right plate materials, and the plate material that forms the right side of the rear floor part is butt-welded with the plate material that forms the wheel house part on the right side and then press-formed. The right side portion and the left side portion of the rear floor portion, and the left side portion press-molded after the plate material to be the left wheel house portion is butt-welded and joined to the plate member to be formed on the left side at substantially the center of the vehicle body. The rear floor panel structure according to claim 1, wherein: