JP3294427B2 - Rear floor panel structure - Google Patents

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 constituting a rear floor portion has a rear floor portion 12 and left and right rear wheel house portions 13 and 14. Conventionally, as shown in FIG. 5, a rear floor section 12 and a rear wheel house section 13, 1
4 is a member formed by press-forming another panel having a different thickness. 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.
And spot welding of the flange 12b and the flange 14a in the same manner, and one in which the rear floor portion and the rear wheel house portion are integrally formed.

[0003]

However, when the rear floor portion 12 and the rear wheel house portions 13 and 14 are spot-welded, the shapes of the respective members and the welding surfaces are complicated, and the work is difficult. This alone may not be enough to secure the bonding strength, and it is necessary to apply a structural adhesive to the spot flange surface in order to improve the strength, which increases the number of assembly steps in conjunction with the welding steps. was there.

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

In addition, there is a restriction in press forming on the drawing depth of the spare tire storage portion on the rear floor portion and the wheel house portion. The squeezing angle must be shallow, and the spare tire storage space becomes substantially larger. Then, in order to secure the spot flange surface of the rear floor frame connected to the lower part of the rear floor part, this rear floor frame must be offset to the left and right from the position where it is originally arranged, and the angle of narrowing the wheel house part also Because it is shallow, it becomes troublesome to pass the rear floor frame between the spare tire storage part and the wheel house part where both are formed. In addition, the offset portion needs to be reinforced, and weight and cost increase become more serious problems.

SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned problems of the prior art, and has as its main object to reduce the weight, cost, and complexity of the assembling operation. It is an object of the present invention to provide a rear floor panel structure capable of securing the strength of a part.

[0007]

An object of the present invention is to provide a rear floor section 2 and rear wheel house sections 3 and 4 which project toward the passenger compartment to accommodate rear tires and are thicker than the rear floor section 2. In the rear floor panel structure,
The plate material forming the rear floor portion 2 is made of separate left and right plate materials.
A plate material to form the right side 2a of the rear floor portion 2.
Then, the plate material that should form the wheel house 3 on the right side protrudes.
Right-hand part, deep drawn and pressed after butt welding
A plate that forms the minute 1a and the left side 2b of the rear floor 2
In the material, the plate material that should form the wheel house part 4 on the left side is
Left side butt-welded followed by deep drawing press
This is attained by providing a rear floor panel structure wherein the portion 1b is joined substantially at the center of the vehicle body . Concretely, the left and right plate material to be the rear floor part and the plate material to be the rear wheel house part are continuously joined by high-density energy beams such as laser welding and plasma welding, which have a small heat affected range, respectively. It is more preferable that the left and right panels are spot-welded at the center to form a rear floor panel.

[0008]

[ Function ] The plate material forming the rear floor is composed of separate left and right plate materials.
And a rear wheel house with different thicknesses
Butt plate material is butt-welded in advance, and deep drawing press working
After performing spot welding on the left and right panels at the center,
By forming the floor panel, each portion has an appropriate thickness, a desired strength can be secured, and the weight is not increased more than necessary. Further, a relaxed constraints on press working, a press working at the right and left panels deep drawing is volume
This makes it easy to cope with the case where the drawing depth is large, and the rear floor frame attached thereafter can be arranged at a desired position.

[0009]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a block diagram of a preferred embodiment of the present invention.

FIG. 1 is a perspective view showing a part of a rear floor panel to which the present invention is applied, and FIG.
It is sectional drawing seen about the -II line. Rear floor panel 1
Has a right rear wheel house portion 3 and a left rear wheel house portion 4 formed on the left and right outer sides of the rear floor portion 2 and thicker than the rear floor portion 2. A spare tire storage section 5 is formed substantially at the center of the rear floor section 2. Further, rear floor frames 6, 7 extending in the front-rear direction are coupled to the left and right outer sides of the spare tire storage section 5 on the lower surface of the rear floor section 2. In this embodiment, the rear floor panel 1
Is to connect the right part 1a and the left part 1b to the central weld 1
It is formed by spot welding at c. That is, the right portion 1a includes the right rear floor portion 2a and the right rear wheel house portion 3, and the left portion 1b includes the left rear floor portion 2b and the left rear wheel house portion 4.

Actually, a blank material formed by continuously welding with a high-density energy beam a plate material forming the wheel house portions 3 and 4 to a plate material forming the left and right rear floor portions 2a and 2b , including a deep drawing press process. By processing, the right part 1a and the left part 1b are formed. FIG. 3 shows the blank 8 before press working which forms the right portion 1a. Portion 8a by pressing the blank 8 forms the right rear floor portion 2a, section 8
b forms the right wheel house 3. Note that the same applies to the left portion 1b, and a detailed description thereof will be omitted. The pressing was right portion 1a and the left portion 1b, the spot welding at the center welding portion 1c, further rear floor panel 1 by combining the rear floor frame 6 is completed on the lower surface of the rear floor portion 2.

Here, by performing continuous welding as described above, required joining strength between the rear floor portion and the wheel house portion can be secured, and there is no need to separately apply a structural adhesive or the like. Since they are welded together, the work is easy, and assembling workability is improved as a whole.

Further, as shown in FIG. 1 as viewed along the line IV-IV in FIG. 1, the right-hand portion 1a and the left-hand portion 1b are spot-welded at the central welded portion 1c thereof to form the rear floor panel 1. As a result, compared to the conventional case where the rear floor portion and the rear wheel house portion are integrally formed (imaginary line), a flange portion for mounting the rear floor frame can be secured inside, and the wheel house portion does not interfere with the frame. There is no need to bend. Therefore, the strength can be secured without separately providing a reinforcing material.

[0014]

[0015]

As apparent from the above description, according to the rear floor panel structure of the present invention, the rear floor portion
Is composed of separate left and right plates, and each plate
Pre-made the plate material that forms the rear wheel house part with different plate thickness
Butt welded and deep drawn
After that, the left and right panels are spot-welded at the center and rear flow
By a structure forming a door panel, each part without steps increase becomes a proper thick, it also has a name that is heavier than necessary with the desired strength can be secured. Further, it is relaxed constraints on press working, it can be easily press working at lateral deep drawing of each panel can be placed subsequently on the rear floor frame also desired position mounted with can cope with a case draw depth greater Therefore, the strength can be secured without separately providing a reinforcing material, and the weight can be further suppressed.

[Brief description of the 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. 1;

FIG. 3 is a plan view showing a blank material formed by butt-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. 1;

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

FIG. 6 is a sectional view taken along line VI-VI of FIG. 5;

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Rear floor panel 1a Right part 1b Left part 1c Central welded part 2 Rear floor part 2a Right rear floor part 2b Left rear floor part 3 Right rear wheel house part 4 Left rear wheel house part 5 Spare tire storage part 6, 7 Rear floor frame 8 Blank material 8a Rear floor Portion 8b Portion of Wheel House 11 Rear Floor Panel 12 Rear Floor 13, 14 Rear Wheel House 12a, 12b, 13a, 14a Flange

──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A-6-671 (JP, A) JP-A-60-94873 (JP, A) JP-A-63-121575 (JP, A) 134877 (JP, U) JP-A 3-125682 (JP, U) (58) Field surveyed (Int. Cl. ⁷ , DB name) B62D 25/20

Claims (1)

(57) [Claims] At a [Claim 1] and rear floor portion 2, a rear floor panel structure having a said rear floor portion of the 2 thicker than the rear wheel house portion 3,4 with protruding into the passenger compartment side so as to house the rear tire, the rear floor The plate material forming part 2 is separated from left and right plate materials
Becomes, the plate should form a right 2a of the rear floor portion 2, the right
The plate material to form the wheel house 3
Right-hand part 1a which has been deep drawn and pressed after welding
If, on the plate material to form a left 2b of the rear floor portion 2, the left
The plate material to form the wheel house part 4
The left part 1b which has been deep drawn and pressed after being welded
Is joined at substantially the center of the vehicle body .