JPH0611904Y2 - Body floor structure - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial field of application) The present invention relates to a vehicle body structure of an automobile, and more particularly to a vehicle body floor portion structure including a honeycomb sandwich structure floor panel.

(Prior Art) Generally, the floor surface of a vehicle compartment is formed by a floor panel made of a single plate. The floor panel is
The left and right sides are supported by side sills. In that case, in order to make the floor surface of the passenger compartment as flat as possible, the floor panel is required to be flat except for the central tunnel portion. However, if you increase the area of the plane,
The rigidity of that portion is lowered, and the surface vibration is caused due to the vibration of the vehicle body. Further, the floor panel is also required to suppress the vibration of the entire floor portion and to block the noise transmitted to the vehicle interior. However, if the rigidity is low, such a vibration damping and sound insulating effect is not sufficient. You will not be able to get it.

Therefore, usually, a reinforcing material such as a cross member or a sound insulating material such as an insulator is attached to the floor panel to ensure the rigidity thereof and improve the sound insulating property. However, if such a reinforcing material or sound insulating material is attached, the vehicle body weight will inevitably increase. Also,
There is also a problem that a difference in vibration damping and sound insulating effects occurs between the part to which the reinforcing material is attached and the other part.

From this, as shown in, for example, Japanese Utility Model Publication No. 57-133479, the floor panel is formed by a panel having a honeycomb sandwich structure in which a honeycomb core is sandwiched between an upper plate and a lower plate. Is being considered.
Such a honeycomb panel is lightweight, yet has extremely high rigidity, and is also excellent in sound insulation. Therefore, by using such a floor panel having a honeycomb structure, it is possible to make the plane portion of the floor surface of the passenger compartment a large area.

Since such a honeycomb panel can obtain high rigidity due to its structure itself, conventionally, thin plates having the same thickness have been used for both the upper surface plate and the lower surface plate.

(Problems to be Solved by the Invention) However, the floor panel of an automobile has its lower surface facing the road surface. Therefore, its lower surface may come into contact with obstacles protruding from the road surface or may be hit by pebbles or the like that are flipped up from the road surface.
It is often scratched. And when it gets scratched like that,
Rust is generated from the damaged portion, and the plate thickness is substantially reduced.

Therefore, when a conventional honeycomb panel having an upper plate and a lower plate made of a thin plate is used as it is as a floor panel of an automobile, the lower plate has holes. Honeycomb panels used for automobile floor panels often have honeycomb cores made of paper, so if there is a hole in the bottom plate, the water entering through the holes wets the honeycomb core, and Will be damaged and the rigidity of the floor panel will decrease.

A honeycomb panel having a large thickness of the upper surface plate and the lower surface plate may be used. However, if this is done, the floor panel becomes heavy and the weight of the entire vehicle body increases.

Further, as in the conventional case where the vehicle body floor portion is configured by using the panel which is previously configured in the honeycomb sandwich structure, there is a problem that it is difficult to attach the honeycomb panel to the vehicle body.

The present invention has been made in view of such problems, and an object thereof is to easily form a floor panel having a honeycomb sandwich structure having high durability while suppressing an increase in weight as much as possible. It is to be.

(Means for Solving the Problems) In order to achieve this object, in the present invention, a flat surface portion of a passenger compartment floor surface between a side sill and a center tunnel and a honeycomb core between an upper surface plate and a lower surface plate are provided. A honeycomb sandwich structure sandwiched between the lower plate and the side sill upper panel forming the upper part of the side sill, the side sill frame forming the lower part of the side sill, or the tunnel panel forming the upper part of the center tunnel is integrally formed. I try to mold it as a thing. In a portion of the lower surface plate located between the side sill and the center tunnel, a recess having a depth substantially equal to the thickness of the honeycomb core and having a size enough to surround the honeycomb core is formed. The honeycomb core is housed in the recess. The upper surface plate has a smaller thickness than the lower surface plate, and is joined to the lower surface plate at the upper flat portion formed around the recess.

(Operation) With this configuration, the plane portion of the vehicle floor between the side sill and the center tunnel is formed as a honeycomb sandwich panel integrated with the side sill or the center tunnel that is the vehicle body strength member. Therefore, it is extremely easy to assemble the panel to the vehicle body. Moreover, in this case, since the lower surface plate is provided with the concave portion and the honeycomb core is accommodated in the concave portion, the honeycomb core is accurately positioned. Therefore, it is possible to accurately form a highly rigid floor panel having a honeycomb sandwich structure on the plane portion of the floor surface of the passenger compartment. Further, by providing such a concave portion, the upper flat portion is formed around the concave portion, so that the top plate may be a flat plate.
As a result, the floor surface of the passenger compartment can be completely flattened.

Further, since the lower surface plate of the floor panel is integrated with the panel forming the side sill or the center tunnel, its plate thickness is large. Therefore, even if the bottom surface of the floor panel is scratched, it is possible to prevent a hole from being formed from the scratch, and the durability is improved. Further, since the thickness of the upper surface plate can be reduced by the amount that the thickness of the lower surface plate is increased, an increase in the weight of the entire floor panel is suppressed.

Further, since the bottom plate has such a large thickness and the recess is provided in the bottom plate, the weight of the floor panel is concentrated on the lower part, so that the vehicle having a low center of gravity can be used. Can be

Embodiment An embodiment of the present invention will be described below with reference to the drawings.

FIG. 1 shows an embodiment of a vehicle body floor portion structure according to the present invention. FIG. 1 is an exploded perspective view thereof, and FIG.
The figure is a vertical sectional view in the left-right direction.

As is clear from FIG. 1, this automobile frame 1
Is formed integrally by pressing a metal plate. That is, a pair of side sill frames 2 and 2 extending in the front-rear direction are provided on both left and right sides of the frame 1 at a position corresponding to the floor surface of the vehicle compartment, and the central portions thereof extend in the front-rear direction close to each other. A pair of center frames 3 and 3 are provided. The side sill frame 2 and the center frame 3 are connected to each other at the front and rear ends thereof by a front cross member 4 and a middle cross member 5, which extend in the left and right direction, respectively. Further, a front frame 6 is integrally provided on the front portion of the front cross member 4,
A rear frame 7 is integrally provided at the rear of the middle cross member 5.

As is clear from FIGS. 1 and 2, the side sill frame 2
The center frame 3 and the center frame 3 are both channel-shaped and open upward. Then, the side sill 9 having a hollow closed cross section is formed on the upper surface of the side sill frame 2 by superimposing and joining the channel-shaped side sill upper panels 8, 8 opened downward.

Also, one large panel 10 is installed between the left and right side sills 9, 9. This panel 10
The central part of is formed as a channel-shaped tunnel panel 11 that opens downward. This tunnel panel 11
Is on the pair of center frames 3 and 3,
By joining these, the center tunnel 12 having a hollow closed cross-section reinforcing portion is formed at the lower portions on both sides.

A portion between the left and right side edge portions of the panel 10 and the tunnel panel 11 is formed as a lower surface plate 13 having a concave portion which is recessed while leaving an upper flat portion in the periphery. Therefore, the thickness of the lower surface plate 13 is almost equal to the thickness of the tunnel panel 11 forming the center tunnel 12 which is the vehicle body strength member, that is, the thickness of the floor panel formed by a conventional single plate. It has the same thickness.

The upper flat portion formed around the concave portion of the lower surface plate 13 is a horizontal flange 14 at a portion adjacent to the side sill 9, that is, at the left and right side edge portions of the panel 10. Further, a horizontal step portion 1 is provided in a portion adjacent to the center tunnel 12, that is, between the concave portion and the tunnel panel 11.
It is said to be 5. The recess has a depth substantially equal to the thickness of the honeycomb core 16 and a size substantially equal to the plane area of the honeycomb core 16. Further, the bottom surface of the recess is flat. The honeycomb core 16 is adhered to the bottom surface of the recess, and the upper surface plate 17 is adhered to the upper surface of the honeycomb core 16. The upper surface plate 17 has a smaller thickness than the panel 10, and the horizontal flange 14 and the step portion 1 of the panel 10 are provided at the side edge portions thereof.
5 are joined to the respective upper surfaces. Furthermore,
The horizontal flange 14 of the panel 10 is adapted to be joined to the upper surface of a support flange 18 of the side sill 9 which projects inside the vehicle body.

The front and rear edges of the panel 10 are respectively joined to the front cross member 4 and the middle cross member 5.

Thus, the floor panel 19 between the side sill 9 and the center tunnel 12 is configured as a honeycomb sandwich structure in which the honeycomb core 16 is sandwiched between the upper plate 17 and the lower plate 13. The lower surface plate 13 has a relatively large plate thickness.

In the floor portion configured in this manner, the lower surface plate 13 that is easily damaged by collision of small stones or the like and is apt to generate rust has a plate thickness similar to that of a normal single-plate floor panel. Therefore, even if the lower surface plate 13 is damaged and rust is generated from the damaged portion, the holes are not easily formed. As a result, the honeycomb core 16 does not get wet due to water infiltration, so that even when the honeycomb core 16 is made of paper, there is no fear of weakening or damaging it.

Moreover, since the lower surface plate 13 has a thickness substantially equal to the thickness of the floor panel formed of a single plate, the adhesion between the honeycomb core 16 and the upper and lower surface plates 17, 13 may be peeled off for some reason. Even if the honeycomb core 16 is damaged, the function as the floor panel can be maintained. That is, the lower surface plate 13 has a fail-safe function.

Further, the lower surface plate 13 is heavier than the upper surface plate 17 due to the larger plate thickness. Moreover, a recess is formed in the lower surface plate 13 so that it is located below the upper surface plate 13. Therefore, the weight of the floor panel 19 concentrates on the lower part. This makes it possible to realize a vehicle with a low center of gravity.

Further, since the lower surface plate 13 of the floor panel 19 itself has a function as a floor panel as described above, the upper surface plate 17 does not need to be so rigid, and the honeycomb sandwich structure is formed. It is enough to play a complementary role in. Therefore, the plate thickness of the top plate 17 can be made as small as possible.

On the other hand, the lower surface plate 13 of the floor panel 19 is formed integrally with the tunnel panel 11. Therefore, the floor panel 19 is firmly joined to the center tunnel 12 which is a strength member of the vehicle body, and the vibration damping effect of the floor portion due to the honeycomb structure can be surely obtained. Further, since the inside and outside of the vehicle compartment are partitioned by the single panel 10 without any gap, noise from the outside of the vehicle is completely cut off.
The honeycomb core 16 is on the upper surface side of the panel 10,
That is, since it is provided inside the vehicle compartment, not only the water outside the vehicle but also the water that has entered the hollow portions of the side sill 9 and the center tunnel 12 do not touch the honeycomb core 16. If a sealant or the like is applied to the joint portion of the upper surface plate 17, the waterproof property becomes more reliable.

Further, since the lower surface plate 13 is provided with a recess and the honeycomb core 16 having substantially the same area as that of the recess is accommodated in the recess, the honeycomb core 16 is prevented from being displaced when the vehicle body is assembled. Therefore, the assembling is facilitated, and the flat portion of the floor surface of the vehicle compartment is made to have a honeycomb sandwich structure almost exactly over the entire surface. Since the depth of the recess is made substantially equal to the thickness of the honeycomb core 16, the upper surface of the honeycomb core 16 and the upper flat portions 14 and 15 around the recess are substantially flush with each other. Therefore, the upper surface plate 17 can be joined to the lower surface plate 13 without pressing the upper surface plate 17, and the honeycomb core 16 can be completely sealed. Moreover, in this way, the top plate 17
Is flat, the floor surface of the passenger compartment between the side sill 9 and the center tunnel 12 is completely flattened.

In the above embodiment, the lower surface plate 13 of the floor panel 19 is integrated with the tunnel panel 11, but they are formed separately and the lower surface plate 13 is formed into the upper panel 8 of the side sill 9 or the side sill frame 2. It can also be formed integrally with any of the above. When the side sill frame 2 is integrated with the side sill frame 2, it may be integrated with the center frame 3 into the frame 1.

(Effects of the Invention) As is apparent from the above description, according to the present invention, the lower surface plate constituting the flat surface portion of the floor surface of the passenger compartment of the honeycomb sandwich structure is the panel forming the side sill or the center tunnel which is the vehicle body strength member. Alternatively, since it is formed integrally with the frame, the thickness of the bottom plate becomes thicker. As a result, even if pebbles or the like collide with the lower surface plate facing the road surface and the outer surface is damaged, and rust is generated from the damaged portion, the lower surface plate is not easily punctured. Therefore, even if the floor panel has a honeycomb sandwich structure, its durability can be improved.

Further, since the lower surface plate has the same plate thickness as that of the conventional one, sufficient strength can be ensured by the lower surface plate. Therefore, the upper surface plate has a honeycomb sandwich structure. It is enough to play only the role. That is, the thickness of the top plate can be made as small as possible. Therefore, an increase in vehicle body weight can be reduced.

Further, since the bottom plate becomes heavy and the recess is provided in the bottom plate, the weight of the floor panel is concentrated on the lower part, so that the center of gravity of the vehicle becomes lower. As a result, it is possible to obtain an effect that steering stability is improved.

Further, since the lower surface plate is provided with a concave portion and the honeycomb core is housed in the concave portion, and the upper surface plate is joined to the upper flat surface portion around the concave portion, the flat surface portion of the passenger compartment floor surface is easy and secure. In addition, the honeycomb sandwich structure can be formed, and the upper surface of the passenger compartment floor can be made completely flat.

[Brief description of drawings]

FIG. 1 is an exploded perspective view showing an embodiment of a vehicle body floor portion structure according to the present invention, and FIG. 2 is a vertical sectional view of the floor portion in the left-right direction. 1 ... Frame 2 ... Side sill frame 3 ... Center frame 8 ... Side sill upper panel 9 ... Side sill 10 ... Integrated panel 11 ... Tunnel panel 12 ... Center tunnel, 13 ... Bottom plate 16 ... Honeycomb core, 17 ... Top plate 19 ... Floor panel

Claims (1)

[Scope of utility model registration request] 1. A vehicle body floor structure in which a plane portion of a vehicle compartment floor surface between a side sill and a center tunnel has a honeycomb sandwich structure in which a honeycomb core is sandwiched between an upper plate and a lower plate. The lower surface plate is integrally formed with at least one of a side sill upper panel forming the upper portion of the side sill, a side sill frame forming the lower portion thereof, and a tunnel panel forming the upper portion of the center tunnel, and the upper surface plate is The thickness of the lower surface plate is smaller than that of the lower surface plate, and the portion of the lower surface plate located between the side sill and the center tunnel is surrounded by the honeycomb core at a depth substantially equal to the thickness of the honeycomb core. Is formed, and the honeycomb core is housed in the recess, and the upper surface plate is surrounded by the periphery of the recess. Characterized in that it is joined to the lower face plate in the upper flat portion formed in the vehicle body floor portion structure.