JPH0775993B2 - Car floor structure - Google Patents

Description

TECHNICAL FIELD The present invention relates to improvement of a floor structure of an automobile.

(Prior Art) Since a floor panel of a vehicle body preferably has high rigidity, a plurality of beads are generally formed in the vehicle width direction. As disclosed in Japanese Utility Model Laid-Open No. 60-145975, as such a floor structure, a floor panel having a large number of beads protruding upward is formed into a curved surface protruding downward, and the upper surface portion of each bead is formed. There is known a configuration in which the radius of curvature is set to be larger than the radius of curvature of the curved surface so as to be substantially as close to a plane as possible.

(Problems to be Solved by the Invention) However, in the floor structure in which the beads are formed on the floor panel as described above, inconvenience occurs in the electrodeposition coating step which is one of the vehicle body manufacturing steps.

That is, as shown in FIG. 6, the undercoat coating of the vehicle body of an automobile is carried out by suspending the vehicle body 1 by a conveyor 2 and immersing the vehicle body 1 in an electrodeposition paint tank 3 for transportation.

However, since the bead forms a recess having a shape that opens downward on the bottom surface of the floor panel, air bubbles accumulate inside the recess, and the interior of the recess cannot be completely coated in the tank 3, resulting in rust or the like. It is the cause.

Further, the bead formed on the upper surface of the floor panel and having the shape opening upward, the coating liquid is accumulated during conveyance in the tank 3, and unnecessary coating liquid remains in the bead even when the bead is discharged,
This leads to wasteful reduction of the coating liquid in the tank 3.

In order to prevent such a situation, there is a method of providing a hole for venting air or liquid on the floor panel to prevent inconvenience due to air bubbles and residual paint liquid, but this requires a large number of holes. At the same time, it is necessary to close the hole after painting is completed. The need for the opening step and the closing step is not preferable because the manufacturing process is complicated.

Therefore, it is an object of the present invention to provide a floor structure in which even a concave portion on the lower surface of a floor can be completely coated, and a concave portion on the upper surface of the floor does not cause so-called carry-out of the electrodeposition coating liquid.

(Means for Solving the Problems) In order to solve the above-mentioned problems, the floor structure of an automobile according to the present invention has a vehicle width direction central portion and a vehicle width direction central portion located below the central portion. A floor panel having an outer end portion and an inclined surface portion connecting the central portion and both outer end portions is provided, and a plurality of beads extending downward in the vehicle width direction and formed downward are formed on the inclined surface portion. A groove that extends downward in the front-rear direction is formed at the outer end portion in the vehicle width direction, and the outer end in the vehicle width direction of each bead is communicated with the groove portion.

(Effects of the Invention) In the floor structure of a vehicle body according to the present invention, the floor panels are inclined surface portions whose outer end portions in the vehicle width direction are located below the central portion in the vehicle width direction. By forming a bead and connecting the bead to the groove formed in the vehicle front-rear direction at both outer ends, in the electrodeposition coating process, the coating liquid flows downward in the bead to enter the groove, As the conveyor moves, it moves inside the groove toward the rear of the vehicle and falls outward from the rear end of the vehicle. For this reason, the vehicle body is not discharged while the unnecessary coating liquid remains on the beads on the upper surface of the floor panel. Therefore, it is preferable that the coating liquid in the coating tank is not wastefully reduced.

Further, the air bubbles in the concave portion opened below the floor panel lower surface move to the central portion above the concave portion and move to the vehicle body rear side in the central portion as the conveyor moves. The coating liquid penetrates and complete coating of the concave portion can be performed. For this reason, it is possible to eliminate rust on the unpainted portion, and it is possible to perform rational and reliable coating.

(Examples) Examples of floor structures according to the present invention will be described below with reference to the drawings.

As shown in FIG. 1, a floor panel 10 according to the present invention is formed with inclined surface portions 13 and 13 having a high central portion 11 in the vehicle width direction and low outer end portions 12 and 12 in the vehicle width direction, and has a substantially chevron cross section. Has become.

A plurality of beads 14 projecting downward are formed on the inclined surface portions 13 and 13 in parallel with each of the inclined surface portions 13 and 13 in the vehicle width direction.

These beads 14 are communicated with a groove portion 15 formed in the outer end portion 12. The groove portion 15 is formed in a straight line in the vehicle front-rear direction, and in this embodiment, the groove portion 15A on the vehicle body rear side is formed.
Is formed deeper than the groove 15B on the front side so that the paint can be easily guided to the rear side.

FIG. 2 shows a cross-sectional view of the groove 15 cut in the vehicle front-rear direction. A convex portion 16 is formed in the center of the groove portion 15 in the vehicle front-rear direction, and a cross member (not shown) is welded from below.
The inclined surface portion 16a of the convex portion 16 on the front side of the vehicle body is formed to have a gentle inclination. Further, the inclined surface portion 15a of the groove portion 15A on the rear side of the vehicle body also needs to be gently inclined.

This gentle slope means a gentler slope than the angle at which the electrodeposition paint tank is discharged by the conveyor during electrodeposition coating.

Next, the flow of the coating liquid to the floor panel in the electrodeposition coating tank will be described with reference to FIGS. 1 and 3. As described above, the vehicle body enters the paint tank from the front of the vehicle body, is conveyed by the conveyor, and exits upward from the front.

The bead 14 formed on the floor panel 10 causes the coating liquid on the upper surface side of the floor panel to flow from the bead 14 to the groove portion 15 along the arrow A due to the inclination of the inclined surface portion 13 and to the vehicle body rear side inside the groove portion as the conveyor conveys the vehicle body. Flows to. At this time, the coating liquid on the front side of the vehicle body moves smoothly to the rear side of the vehicle body in the groove portion 15 because the inclined surface 16a of the convex portion 16 is gentle, and from the hole portion 17 or the like as shown by an arrow A'in FIG. The coating liquid does not remain in the bead after falling down or flowing out from the rear edge of the floor panel 10 to the outside.

Further, on the lower surface side of the floor panel, the air bubbles in the downwardly opened concave portion rise along the inclined surface portion 13, move in the direction of arrow B and escape to the central portion, and in the direction of arrow B'with conveyor conveyance. Move to the rear of the vehicle and exit backward.

Therefore, the coating liquid penetrates into the recess and is completely coated without being blocked by the bubbles.

Further, FIG. 4 is a schematic sectional view in the vehicle width direction of a vehicle body front side portion of a floor panel according to another embodiment of the present invention.

Conventionally, there is a floor panel in which a tunnel portion is formed in the central portion in the vehicle width direction. This improves the strength of the floor as compared to the flat floor, but has the drawback that the interior of the vehicle becomes narrower because the tunnel projects into the vehicle interior. Therefore, when applying the present invention while leaving the tunnel structure, a conventional tunnel 21 is formed on the floor panel as shown in FIG. 4, and the outer edge in the vehicle width direction is formed from the same height as the high portion of this tunnel. It is preferable that the floor panel has the inclined surface portions 23, 23 descending toward the section.

As shown in FIG. 5, the cross section of FIG. 4 taken along the line V-V has a plurality of beads 24 formed in the vehicle width direction as shown in FIG. 5, and these beads 24 are grooved (not shown). No) It is made to communicate.

With such a floor structure, the rigidity of the floor panel tunnel can be secured, and the above-mentioned problems during electrodeposition coating can be solved. The tunnel panel does not project in the center, so the floor panel is flat and convenient to walk in the passenger compartment. Is. In addition, the interior of the vehicle is spacious, and when applied to a luggage compartment such as a truck, luggage can be loaded in the tunnel as well, so the luggage compartment space is expanded.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a perspective view of an embodiment of a floor structure of a vehicle body according to the present invention, FIG. 2 is a sectional view of a groove portion of the embodiment in the vehicle front-rear direction, and FIG. FIG. 4 is a perspective view of an inclined surface portion, FIG. 4 is a schematic sectional view in the vehicle width direction of another embodiment according to the present invention, FIG. 5 is a schematic sectional view of the other embodiment in the front-rear direction of the vehicle body, and FIG. 6 is a schematic view of an electrodeposition coating method. Is. 10 …… Floor panel, 11 …… Car width direction central part 12 …… Car width direction outer end part, 13 …… Slope surface part 14 …… Bead, 15 …… Groove part

Claims (1)

[Claims] 1. A floor panel having a vehicle width direction central portion, vehicle width direction outer end portions located below the central portion, and an inclined surface portion connecting the central portion and both outer end portions. A plurality of beads that extend downward in the vehicle width direction are formed on the inclined surface portion, and a groove extending in the front-rear direction that protrudes downward is formed on the outer end portion in the vehicle width direction. An automobile floor structure, wherein an outer end of a bead in a vehicle width direction is communicated with the groove.