JPS63232083A - Floor structure for automobile - Google Patents

Abstract

PURPOSE:To improve the working efficiency of assembly of a car body, by a method wherein upper and lower facing materials with which a floor panel having honeycomb sandwich structure is formed are joined together to form a flange on its whole peripheral edge part, and the flange is placed on the horizontal flange of a support member for joining. CONSTITUTION:Formation of a plateform front panel 17 is such that a honey comb 20 is nipped between a plateform upper facing material 18 and a thicker lower facing material 19 the peripheral edge of which is bent upward and bent again to a horizontal state, and the peripheral edge parts of the two facing materials are joined together to form a flange part 17a throughout the whole of the peripheral edge. In assembly of a car body, the flange part 17a of the front floor panel 17 is placed on horizontal flanges 14a and 16a of an opening part surrounded with a side sill, a center tunnel, a front cross member 14, and a middle cross member 16 to weld them together by spot welding and other like methods. This constitution enables a floor panel to be easily mounted without damaging strength, and ensures damping ability and sound insulation performance since a floor panel is of honeycomb structure.

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial Application Field) The present invention relates to an automobile body structure, and particularly to an automobile floor structure including a floor panel having a honeycomb sandwich structure.

(Prior Art) Generally, the floor portion of an automobile is composed of zero-strength members such as side sills and cross members that extend in the front, rear, left, and right directions of the vehicle body, and a floor panel installed between them. The floor panel must be designed to prevent surface vibration from occurring due to vehicle body vibration, especially in the part that forms the floor surface of the IP room. They are also required to play a major role in damping vibrations and blocking noise transmitted into the vehicle interior.

Therefore, a reinforcing member with a sment of t < 9, a sound insulating material such as Melsheet or an insulator is usually attached to the floor panel in order to increase its rigidity and improve its sound insulating properties.

However, installing such reinforcing members and sound insulating materials inevitably increases the amount of car body material, and also increases the vibration damping and sound insulating effect between the parts where the reinforcing members and Mel sheet are installed and other parts. There is also the problem of differences. Furthermore, although it is desirable that the floor surface of the upper chamber be as flat as possible, it is inevitable that unevenness will occur on the floor surface when reinforcing members and Mel sheet are attached.

For this reason, for example, Utility Model Application No. 57-130772
As shown in Japanese Utility Model Publication No. 57-133479, etc., it has been considered to form a floor panel with a panel having a honeycomb suntoi structure in which a honeycomb core is sandwiched between upper and lower facing materials. There is. Such honeycomb panels are lightweight, yet extremely rigid, and also have excellent sound insulation properties.

By the way, such a honeycomb panel cannot be joined to other parts by simple spot welding or bolt tightening, so when using it for the floor panel of automatic +lj, it is necessary to attach it to the surrounding side sills, cross members, etc. The problem is how to install it. If the bond is not strong, the vibration damping and sound insulation effects achieved by using the honeycomb sandwich floor panel will cease to be effective within 1 minute.

Therefore, in the device disclosed in the above-mentioned Japanese Utility Model Publication No. 57-130772, the upper and lower side panels of the floor panel and the side sills are integrally molded. Also, Utsukai Showa 57-
In the device disclosed in Japanese Patent No. 113479, a horizontal protrusion is provided on the side sill, and the protrusion is fitted between the upper and lower face members of the floor panel.

(Problems to be Solved by the Invention) However, in the former case where the floor panel and side sill are integrated, it is necessary to form the honeycomb-structured floor panel at the same time as the vehicle body is assembled. That is, it is necessary to incorporate a process of gluing or welding the honeycomb core and the upper and lower face materials into the vehicle body assembly process. This would require significant changes to the body assembly line, and in such a line the honeycomb core would be exposed inside the side sill. The honeycomb cores used in automobile floor panels are often made of paper, etc., so if the honeycomb cores are exposed inside the side sills, there is a risk that the honeycomb cores will be weakened by water that has entered the inside of the side sills. There is.

In addition, in the latter case where a honeycomb-structured floor panel is fitted into the protrusion of the side sill, the upper and lower panels of the floor panel are supported separately, making it impossible to obtain sufficient strength. Moreover, since the honeycomb panel has extremely high rigidity, it is extremely difficult to fit the both side edges into the protrusion in this way.

On the other hand, it is necessary to provide a center tunnel extending in the longitudinal direction in the center of the vehicle floor.
The center tunnel is formed by press-molding the floor panel, but in the case of a floor panel with a honeycomb structure, press-molding is not possible.

Therefore, if an attempt is made to provide a center tunnel integrally with the floor panel, the honeycomb panel itself must be formed into a desired shape in advance, resulting in extremely high costs.

Therefore, when using a honeycomb panel as a floor panel, it is necessary to use the honeycomb panel only for the flat part of the floor surface of the vehicle interior, and to use a separate part for the center tunnel and the like. In that case, if the center tunnel part were simply separated from the conventional shape, its rigidity would be insufficient, making it impossible to obtain sufficient support strength for the floor panel.
If the floor panel is not rigidly supported, even if a honeycomb structured panel is used, its effect will not be fully utilized.

The present invention has been made in view of such problems, and its purpose is to enable a floor panel having a honeycomb sand inch structure to be easily and firmly supported by supporting members around the floor panel. It is.

(Means for Solving the Inn Points) In order to achieve this object, the present invention provides a floor panel with a honeycomb sandwich structure that forms the flat part of the floor surface of the vehicle interior, and the upper and lower surface materials that are the constituent members of the panel. They are joined to each other at their peripheral edges, thereby forming a flange around the entire circumference. Further, the support member forming the periphery of the opening to which the floor panel is attached has a hollow closed cross-sectional shape with a horizontal flange protruding toward the opening side. Then, the flange of the floor panel is attached to the horizontal flange of the support member.

(Function) With this configuration, the floor panel can be easily attached by simply fitting it into the opening surrounded by the support member from above. Since the supporting member has a hollow closed cross-sectional shape, it has sufficient rigidity.

Therefore, sufficient support strength for the floor panel can be obtained, and the vibration damping and sound insulation effects of the floor panel with the honeycomb sand inch structure can be reliably exhibited. Furthermore, since the peripheral edge of the floor panel is also closed by the upper and lower facing materials, water and the like will not enter the interior, and its strength will be maintained over a long period of time.

(Example) Hereinafter, the invention will be described in detail with reference to the drawings.

The figures show an embodiment of the floor structure of an automobile according to the present invention, and FIG. 1 is an exploded perspective view thereof, and FIG.
FIG. 3 is a vertical sectional view in the left-right and front-back directions.

As is clear from FIG. 1, the frame 1 of this automobile is integrally formed by press-forming a thin metal plate.

That is, in the intermediate portion of the frame 1 in the longitudinal direction, pairs of side sill frames 2.2 and a center frame 3.3 extending in the longitudinal direction are provided at positions close to each other on both left and right sides and in the center. These side sill frames 2 and center frame 3 are continuous at their front and rear ends with a front cross member lower 4 and a middle cross member lower 5, respectively, which extend in the left-right direction. Further, a front frame 6 is integrally provided at the front of the front cross member lower 4, and a carrier frame 7 is integrally provided at the rear of the middle cross member lower 5.

In this way, a large-area opening 8.8 surrounded by the side sill frame 2, center frame 3, front cross member lower 4, and middle cross member lower 5 is provided in a portion corresponding to the compartment floor surface in the longitudinally intermediate portion of the frame 1. is formed.

As is clear from Figure 1.2, the side sill frame 2
is a horizontal flange portion 2a at the upper end.

It is said to be a channel-shaped thing that opens upward to the right of 2b. A side sill upper 9 is attached to the upper surface thereof. This side sill upper 9
is in the form of a channel that opens downward, and horizontal flanges 9a and 9b are provided at its lower end. In this way, these side sill frames 2 and site sill frames 2
Each flange portion 2a, 9a; 2b of the pad 9.

By overlapping and spot welding the parts 9b, a side sill 10 having a hollow closed cross-sectional shape is formed. Therefore, the side sill 1 formed in this way
0, the joint flange portions 2a and 9a between the side sill frame 2 and the side sill upper 9 form a water muffle flange lOa that protrudes toward the opening 8 side.

The center frame 3 is also shaped like a channel that opens upward. A horizontal flange portion 3a is formed on the outside thereof, that is, on the side edge on the opening 8 side.

On the other hand, an upwardly inclined flange portion 3b is formed on the side edge portion on the center side. The pair of center frames 3 formed in this way have upper surfaces that are connected to one tunnel panel 1.
1 at the same time. This tunnel panel 11 has a channel shape that opens downward, and has horizontal flange portions 11a on both sides of its lower end.
lla is formed. And the flange part 11
a is spot welded to the horizontal flange portion 3a of the center frame 3. Further, the flange portion 3b on the center side of the center frame 3 is connected to the tunnel panel 11.
It is designed to be joined to the inner surface of the In this way, the tunnel panel 11 and the center frames 3, 3 form a center tunnel 12 having a hollow closed cross-sectional shape and reinforcement portions on both sides. The center tunnel 12 is formed by the joining flanges 3a and lla of the center frame 3 and the tunnel panel 11.
It has a horizontal flange 12a that protrudes toward the opening 8 side.

:t1Jl, As is clear from FIG. 3, the front cross member lower 4 has a channel shape that is open upward. On the rear side, that is, on the side edge on the opening 8 side,
A horizontal flange portion 4a is provided. Further, a flange portion 4b that slopes upward is provided on the front side edge portion. And that front cross member lower 4 1
The lower end portion of the dash panel 13 is attached to the − surface. In that case, the horizontal flange portion 4a on the rear side of the front cross member lower 4 is joined to the edge portion of the dash panel 13, and the flange portion 4b on the front side is joined to the front surface of the dash panel 13. In this way, the dash panel 13 and the front cross member lower 4 form a front cross member 14 having a hollow closed cross-sectional shape.

The front cross member 14 has a horizontal flange 14a that is made up of the flange portion 4a of the front cross member lower 4 and the edge portion of the dash panel 13 and projects toward the opening 8 side.

The middle cross member lower 5 is also shaped like a channel that opens upward, and horizontal flanges 5a and 5b are formed on the front side, that is, on the opening 8 side, and on the rear side edges, respectively. The upper surface of the middle cross member lower 5 is covered by the front end portion of a rear floor panel 15 joined to the upper surface of the rear frame 7. A horizontal flange portion 15a is provided at the lower end of the front end of the rear floor panel 15, and the flange portion 15a is joined to the front flange portion 5a of the middle cross member lower 5. Further, the rear flange portion 5b of the middle cross member lower 5 is joined to the lower surface of the rear floor panel 15. In this way, the front end of the rear floor panel 15 and the middle cross member lower 5 form a middle cross member 16 having a hollow closed cross-sectional shape. Therefore, the middle cross member 16 also has a horizontal flange 16a formed by the flange portion 5a of the middle cross member lower 5 and the flange portion 15a of the rear floor panel 15 and protruding toward the opening 8 side.

In this way, the entire periphery of the opening 8 is surrounded by horizontal flanges 10a, 12a, 14 protruding toward the opening 8 side.
It has a hollow closed cross-sectional structure with a or 16a.

The opening 8 is covered by a flat front floor panel 17. This front floor panel 17 has a honeycomb core 20 between the upper and lower surface materials 18° and 19.
It is said to have a honeycomb sand inch structure sandwiched between two layers. The upper and lower face members 18 and 19 are formed of metal plates. The thickness of the lower panel 1 is greater than that of the upper panel 18.
9 is considered to be thicker. The honeycomb core 20 is made of paper or metal, and the upper and lower face materials 18
, 19 by adhesion or welding.

The upper surface material 18 is a flat plate. Further, the lower surface material 19 is shaped like a plate, with its peripheral edge bent upward and then horizontally. These upper and lower face members 18 and 19 are joined to each other by spot welding or adhesion at their peripheral edges. In this way, the entire circumference of the honeycomb core 20 is completely covered, and a flange 17a consisting of the peripheral edges of the upper and lower face members 18 and 19 is formed around the entire circumference of the floor panel 17. When the floor panel 17 is fitted into the opening 8, the flange 17a is placed on horizontal flanges 10a, 12a, 14a, and 16a provided around the floor panel 17. And spot welding is done between those flanges. and are connected to each other.

In this way, the flat part of the floor of the vehicle compartment is formed by the front floor panel 17 having a honeycomb structure.

When forming the floor structure of such an automobile,
First, place the side sill upper 9, tunnel panel 11, dash panel 13, and rear floor spring i on the frame l.
After the opening 15 is assembled, the front floor panel 17 is fitted into the opening 118 from above, and the flange 17a and the horizontal flanges 10a, 12a, 14a around the opening 8.

1'6a can be welded and joined. Therefore, the Ml standing work can be easily performed using a conventional vehicle body assembly line.

The front floor panel 17 assembled in this manner has a side sill lO, a center tunnel 12. It is supported by a front cross member 14 and a middle cross member 16. Therefore, its entire circumference is rigidly fixed, and the vibration damping and sound insulation effects of the honeycomb-structured floor panel 17 can be reliably obtained.

Moreover, the load added to the front floor panel 17! for,
Flange door a in which upper and lower facing materials 18 and 19 are overlapped
Because they are supported by the parts 1B, 19
No force is applied to cause the gaps to separate, and the strength of the honeycomb sandwich structure is fully utilized. Furthermore, since the upper and lower facing materials 18 and 19 are joined to each other at the edge of the temple, it is possible to prevent water from entering the interior, and even when the honeycomb core 20 is made of paper, its durability is improved. is ensured.

Further, by using the honeycomb-structured floor panel 17, reinforcement thereof becomes unnecessary, so that the floor surface of the vehicle compartment can be made flat. In addition, since the entire surface has high rigidity, there are no areas where the vibration damping and sound insulation effects are small.

In the above embodiment, the upper and lower facings 18 and 19 of the floor panel 17 are made of thin metal plates, but they can also be made of fiber-reinforced plastic or the like. In this way, the weight of the floor panel 17 can be further reduced. In that case, the flange 17a of the floor panel 17 may be joined to the water flange lOa or the like around the opening 8 by adhesion, bolting, or the like.

Further, in the above embodiment, the flange 17a of the floor panel 17 is formed on the upper surface side of the flange 17 panel 17, but it may be formed on the lower surface side or in the middle part thereof. You can also. In that case, the upper surface of the floor panel 17 and the side sill 1
0 or the center tunnel 12, etc., and by closing the groove with a cover, the space can be used for wiring, piping, etc.

(Effects of the Invention) As is clear from the above description, according to the present invention, by joining the upper and lower face materials constituting the floor panel of the honeycomb sandwich structure to each other at their peripheral edges, the entire circumference of the floor panel is improved. A flange is formed on the flange, and the flange is placed on the horizontal 7 flanges provided on the surrounding supporting members so that they fit together at 11a, so that the honeycomb-structured floor panel can be easily fixed without sacrificing its strength. It can be installed. Furthermore, since the floor panel can be formed completely separately from the car body assembly process, the car body assembly can be carried out in the same way as for ordinary automobiles.

Furthermore, since all of the support members that support the floor panel have a hollow closed cross-sectional shape, the rigidity of the support members is extremely high. Therefore, the entire circumference of the floor panel is rigidly supported, and the vibration damping and sound insulation effects achieved by using the honeycomb-structured floor panel can be reliably obtained.

[Brief explanation of the drawing]

FIG. 1 is an exploded perspective view showing one embodiment of the floor structure of an automobile according to the present invention; FIG. 2 is a cross-sectional view of the floor structure taken along the line ■-■ in FIG. 1; FIG. 3 is a cross-sectional view of the floor structure taken along the line ``--'' in FIG. 1. l...Frame 8...Opening lO...
・Side sill (supporting member) 10a...Horizontal flange 12...Center tunnel (supporting member) 12a...Horizontal flange 14...Front cross member (supporting member) 14a・
・Horizontal flange 16 ・Middle cross member (support member) 16a ・・
・Horizontal flange 17...Front floor panel 17a...Flange 18.19...Face material 20...Honeycomb core

Claims (1)

[Scope of Claims] Consisting of a floor panel forming a flat part of the floor surface of the vehicle interior, and a support member forming a periphery of an opening to which the floor panel is attached, the floor panel is arranged between upper and lower surface members. A honeycomb core is sandwiched between the upper and lower surfaces of the core, which are joined to each other at the periphery.
The panel has a honeycomb sandwich structure having flanges around the entire circumference, and the support member has a hollow closed cross-sectional shape with a horizontal flange protruding toward the opening side, and the floor panel is attached to the horizontal flange of the support member. An automobile floor structure on which flanges are mounted and connected.