JPH0611903Y2 - Body floor structure - Google Patents

Description

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

(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 portion to which the reinforcing material and the like are attached and other portions.

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.

By the way, since the honeycomb panel has extremely high rigidity, press molding is almost impossible. Therefore, in the case where the floor surface of the passenger compartment has a honeycomb structure, it is necessary to form only the flat portion of the honeycomb panel and connect it to the side sill or the center tunnel.
In this case, since the honeycomb panel has a large gap in which the honeycomb core is sandwiched between the upper surface plate and the lower surface plate, it cannot be simply joined to another member by spot welding, bolting or the like.

Therefore, in the one disclosed in the above publication, the side sill is provided with a horizontal protrusion, and the protrusion is fitted between the upper surface plate and the lower surface plate of the floor panel. However, since the honeycomb structure floor panel cannot be bent, it is not possible to fit both side edges together into such a protrusion. Therefore, when such a connecting means is used on the side sill side, another connecting means must be adopted on the center tunnel side. As described above, when the floor panel having the honeycomb structure is used alone, it becomes extremely difficult to firmly bond it to other members.

In order to deal with such a problem, for example, the actual exploitation Sho 57-130
As disclosed in Japanese Patent No. 772, it has been considered to form a flat surface portion of a vehicle compartment floor surface having a honeycomb structure integrally with a side sill. In the floor structure, an upper surface plate that forms the floor surface of the passenger compartment is integrated with an upper portion of the side sill inner panel, and a lower surface plate is integrated with a lower portion of the side sill inner panel. A honeycomb core is provided between the upper surface plate and the lower surface plate.

(Problems to be solved by the invention) However, in such a floor structure, the honeycomb core is exposed inside the side sill. Water easily enters the side sill. On the other hand, the honeycomb core used for such a floor panel is often formed of paper. Therefore, if the honeycomb core is exposed inside the side sill as described above, the honeycomb core is weakened by the water that has entered the side sill,
The effect due to the honeycomb sandwich structure cannot be obtained.

Also, muffled sound is generated in the side sill, but in the floor panel in which the space between the top plate and the bottom plate is open to the inside of the side sill, the noise is transmitted to the upper and lower face plates, respectively. . Therefore, the top plate is separated from the honeycomb core to cause surface vibration, and noise is transmitted to the vehicle compartment through the top plate.

Further, in order to secure the strength of the vehicle body, a panel having a relatively large plate thickness is generally used for the side sill. Therefore, when the side sill panel and the top plate are integrated, the top plate also has a large thickness. However, in the case of a floor panel having a honeycomb structure, the rigidity of the top plate itself is not so required. That is, the top plate may be thin. Therefore, in the case where the top plate is integrated with the side sill, the top plate becomes thicker than necessary, which causes an increase in vehicle weight.

The present invention has been made in view of the above problems, and an object thereof is to make a flat surface portion of a vehicle compartment floor surface of a honeycomb sandwich structure and a side sill or a center tunnel integrally formed, The honeycomb core between the upper plate and the lower plate is not exposed to the outside of the vehicle compartment, and the upper plate is thin so that the weight of the vehicle body can be reduced.

(Means for Solving the Problems) In order to achieve this object, in the present invention, a bottom sill forming a flat part of a floor surface of a passenger compartment of a honeycomb sandwich structure is provided with a side sill panel forming an upper part of an inner side surface of a side sill, and It is formed integrally with at least one of the tunnel panels forming the upper surface of the center tunnel. 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 is joined to the lower surface plate at the upper flat surface portion formed around the recess.

(Operation) With this configuration, the flat surface portion of the floor surface of the passenger compartment of the honeycomb sandwich structure is integrated with the side sill or the center tunnel. Therefore, no gap is generated between the honeycomb panel portion and the side sill or the center tunnel, and the sound insulation is improved. Further, since the honeycomb core is completely shielded from the outside of the vehicle compartment by the lower surface plate that is continuous from the side sill panel or the tunnel panel forming the vehicle interior surface, it is not wet with water. Further, since the top plate is separate from the side sill and the tunnel panel, it can be made thin. Further, since the lower surface plate is provided with the concave portion and the honeycomb core is accommodated in the concave portion, the positioning of the honeycomb core becomes easy. Moreover, by providing such a concave portion, the upper flat portion is formed around the concave portion, so that the flat upper plate is joined to the lower plate at the upper flat portion. Therefore, it becomes possible to completely flatten the floor surface of the passenger compartment while sealing the honeycomb core.

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 thin metal plate. That is, frame 1
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 vehicle at a position corresponding to the floor surface of the vehicle compartment, and a pair of center frames 3 extending in the front-rear direction close to each other are provided at the central portions thereof. , 3 are provided.
The side sill frame 2 and the center frame 3 have front and rear front and rear cross members 4 and 5 respectively extending in the left and right direction at the front and rear ends thereof.
Are connected to each other by. A front frame 6 is integrally provided at the front part of the front cross member 4, and a rear frame 7 is integrally provided at the rear part 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, one large-sized integrated panel 8 is joined to the upper surface thereof. The panel 8 extends between the left and right side sill frames 2 and 2, and both side portions facing the side sill frames 2 and 2 are formed as channel-shaped side sill upper panels 9 and 9 opened downward. Thus, the side sill frame 2 and the side sill upper panel 9
By joining with, the side sill 10 having a hollow closed cross section
Are formed.

Further, the central portion of the panel 8 is formed as a channel-shaped tunnel panel 11 which opens downward. The tunnel panel 11 extends over a pair of center frames 3 and 3. By joining these, a center tunnel 12 having hollow closed cross-section reinforcing portions is formed at the lower portions on both sides. .

The panel 8 portion between the side sill upper panel 9 and the tunnel panel 11 is formed as a lower surface plate 13 having a concave portion 13b which is recessed while leaving a flat portion 13a on the periphery. The recess 13b has a depth substantially equal to the thickness of the honeycomb core 14 and a size substantially equal to the plane area of the honeycomb core 14. Also, the recess 13b
Has a flat bottom surface. Then, the recess 13b
The honeycomb core 14 is adhered to the bottom surface of the honeycomb core 14, and the upper surface plate 15 is adhered to the upper surface of the honeycomb core 14. The upper surface plate 15 has a smaller thickness than the panel 8, and is joined to the upper flat surface portion 13a formed around the recess 13b of the panel 8 at the entire peripheral edge portion thereof.

The front and rear edges of the panel 8 are joined to the front cross member 4 and the middle cross member 5, respectively.

Thus, the passenger compartment floor plane portion 16 between the side sill 10 and the center tunnel 12 is configured as a honeycomb sandwich structure in which the honeycomb core 14 is sandwiched between the upper surface plate 15 and the lower surface plate 13. And the lower surface plate 13 is
It is integrated with the side sill upper panel 9 and the tunnel panel 11.

In the floor portion configured in this manner, the vehicle-cabin floor surface flat portion 16 having a honeycomb structure is formed integrally with the side sill 10 and the center tunnel 12. Therefore, the flat portion 16 is firmly connected to the side sill 10 and the center tunnel 12 which are the strength members of the vehicle body, so that the vibration damping effect of the floor portion due to the honeycomb structure can be surely obtained. Further, since the inside and the outside of the vehicle compartment are partitioned by the single panel 8 without any clearance, noise from the outside of the vehicle is completely cut off. Since the honeycomb core 14 is provided on the upper surface side of the panel 8, that is, on the vehicle interior side, not only water outside the vehicle but also water that has entered the hollow portion of the side sill 10 and the center tunnel 12 is also contained in the honeycomb core 14. There is no touch. Therefore, the honeycomb core 1
Even if 4 is made of paper, there is no risk of it weakening or breaking. If a sealant or the like is applied to the joint portion of the upper surface plate 15, its waterproof property becomes more reliable.

Further, since the upper surface plate 15 of the vehicle-cabin floor surface flat portion 16 is formed separately from the side sill 10 and the center tunnel 12, the plate thickness thereof can be set arbitrarily. Therefore, it is possible to reduce the vehicle body weight by reducing the plate thickness. On the other hand, the bottom plate 13 that easily causes rust has a relatively large plate thickness equal to that of the side sill 10 and the center tunnel 12, which are the strength members of the vehicle body. Therefore, the bottom plate 13
Even if rust occurs, it will not be easily punctured.
Then, the upper surface plate 15 can be thinned by the thickness of the lower surface plate 13.

Further, since the lower surface plate 13 is provided with the recessed portion 13b and the honeycomb core 14 having substantially the same area as that of the recessed portion 13b is accommodated in the recessed portion 13b, the honeycomb core 14 will not be displaced when the vehicle body is assembled. Therefore, the assembling becomes easy, and the floor portion 16
Almost all of the structure will surely have a honeycomb sandwich structure. Since the depth of the recess 13b is made substantially equal to the thickness of the honeycomb core 14, the upper surface of the honeycomb core 14 and the upper flat surface portion 13a around the recess 13b are substantially flush with each other. Therefore, the upper surface plate 15 can be bonded to the lower surface plate 13 without pressing the upper surface plate 15 and the honeycomb core 14 can be completely sealed. Moreover, by making the top plate 15 into a flat plate shape in this manner, the floor surface of the passenger compartment between the side sill 10 and the center tunnel 12 is completely flattened.

Although the side sill 10 is formed by the side sill frame 2 on the lower surface side and the side sill upper panel 9 on the upper surface side in the above embodiment, it is disclosed in the above-mentioned Japanese Utility Model Application Laid-Open No. 57-130772. The side sill may be composed of an outer panel and an inner panel, and the inner panel may be further divided into an upper part and a lower part so that the upper part of the inner panel and the lower plate 13 are integrally connected. . In short, it suffices that the upper portion of the inner side surface of the side sill 10 forming the vehicle interior surface and the lower surface plate 13 are integrated.

Further, although the center tunnel 12 is formed by the tunnel panel 11 and the center frame 3, the center frame 3 can be omitted if sufficient rigidity can be obtained only by the tunnel panel 11.
Also on the side of the center tunnel 12, it is essential that the upper surface of the center tunnel 12 forming the vehicle interior surface and the lower surface plate 13 of the flat surface portion 16 are integrally formed.

Further, in the above-described embodiment, the lower surface plate 13 of the vehicle-cabin floor surface flat portion 16 is integrated with both the side sill 10 and the center tunnel 12, but, for example, the center tunnel 12 is formed as a separate body and forms the upper surface thereof. The lower surface plate 13 may be joined to the tunnel panel 11.

(Effects of the Invention) As is apparent from the above description, according to the present invention, the lower surface plate that constitutes the flat surface portion of the floor surface of the passenger compartment of the honeycomb sandwich structure is provided on at least one of the upper inside surface of the side sill and the upper surface of the center tunnel. Since it is integrally molded with either one, the honeycomb panel part and the side sill or center tunnel are completely connected, and the vibration damping and sound insulation effects due to the use of the honeycomb structure can be surely exhibited. . Moreover, since the honeycomb core is located inside the vehicle compartment, it is not wet with water, and even when it is formed of paper, its strength is maintained for a long time.

Further, since the upper surface plate of the honeycomb panel part is formed separately from the side sill and the center tunnel, the plate thickness can be reduced, and the weight of the vehicle body can be reduced. Further, since the lower surface plate is provided with the 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 floor surface flat portion of the passenger compartment is easily and easily formed. The honeycomb sandwich structure is surely formed, and furthermore, the upper surface of the vehicle compartment floor surface 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 ... Integrated panel 9 ... Side sill upper panel 10 ... Side sill 11 ... Tunnel panel 12 ... Center tunnel, 13 ... Bottom plate 14 ... Honeycomb core, 15 ... Top plate 16 ... Cabin Floor plane part

Claims (1)

[Scope of utility model registration request] 1. A vehicle body floor portion structure in which a flat surface portion of a vehicle compartment floor surface between a side sill and a center tunnel is a honeycomb sandwich structure in which a honeycomb core is sandwiched between an upper surface plate and a lower surface plate, The lower surface plate is integrally formed with at least one of a side sill panel forming an upper part of the inner side surface of the side sill and a tunnel panel forming an upper surface of the center tunnel, and A recessed portion having a depth substantially equal to the thickness of the honeycomb core and having a size large enough to enclose the honeycomb core is formed in a portion located between the honeycomb cores, and the honeycomb core is housed in the recessed portion. Is joined to the lower surface plate at an upper flat portion formed around the recess, the vehicle body floor portion structure.