JPH0531026Y2 - - Google Patents

Description

[Detailed description of the invention] (Industrial application field) This invention relates to the body structure of an automobile.
In particular, the present invention relates to a floor structure of an automobile having a floor panel having a honeycomb sandwich structure.

(Prior Art) Generally, the floor portion of an automobile is composed of 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 portion that forms the floor surface of the vehicle interior. The floor panel is also required to play a major role in suppressing vibrations throughout the floor and blocking noise transmitted into the vehicle interior.

Therefore, a reinforcing member such as a cross member or a sound insulating material such as a mel sheet or an insulator is usually attached to the floor panel to increase its rigidity and improve its sound insulation properties.

However, when such reinforcing members and sound insulation materials are attached, the weight of the vehicle inevitably increases. Another problem is that there is a difference in vibration damping and sound insulation effects between the part where the reinforcing member or Mel sheet is attached and the other parts. Furthermore, it is desirable that the cabin floor surface be as flat as possible;
When reinforcing members and Melsheet are installed, it is inevitable that unevenness will occur on the floor surface.

For this reason, for example,
As shown in Japanese Utility Model Publication No. 57-133479, etc., a floor panel can be formed by a panel having a honeycomb sandwich structure in which a honeycomb core is sandwiched between an upper surface material and a lower surface material. It is considered. 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 if it is used as an automobile floor panel, it must be attached to the surrounding side sills, cross members, etc. The problem is how to attach it. Unless the results are solid,
The vibration damping and sound insulation effects obtained by using the floor panel with the honeycomb sandwich structure will no longer be sufficiently exhibited.

Further, although such a honeycomb-structured floor panel is relatively thick, it is desirable to prevent a large level difference from occurring on the floor surface of the vehicle interior even when the floor panel is attached.

Therefore, in the method disclosed in the above-mentioned Japanese Utility Model Application Publication No. 57-130772, the upper and lower face members of the floor panel and the side sills are integrally molded. Further, in the one disclosed in Japanese Utility Model Application Publication No. 57-133497, a horizontal protrusion is provided on the side surface of 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. To do this, the car body assembly line would have to be drastically changed. Moreover, in such a case, the honeycomb core is exposed inside the side sill. Honeycomb cores used in automobile floor panels are often made of paper or the like, so if the honeycomb core is exposed inside the side sills, water that has entered the inside of the side sills can damage the honeycomb cores. There is a risk of weakening.

In addition, in the latter case where a honeycomb structure floor panel is fitted into the protrusion of the side sill,
Since the upper and lower panels of the floor panel are supported separately, sufficient strength cannot be obtained. Furthermore, since the honeycomb panel has extremely high rigidity, it is extremely difficult to fit the both side edges into the protrusion in this manner.

Furthermore, in all of these, the entire bottom surface of the floor panel is flat. On the other hand, it is necessary to install pipes such as fuel pipes, brake pipes, hydraulic pipes for a hydraulic four-wheel steering system, and the like that extend from the front side to the rear side of the car body on the underside of the car body floor. In this case, if the bottom surface of the floor panel is flat, the pipes must be placed below the bottom surface of the floor panel, and the entire pipes will be exposed to the underside of the vehicle body. Therefore, there is a risk that the pipes will be damaged by the thrown up pebbles and the like. Therefore, it is necessary to attach a protective member to the bottom of the floor panel that protrudes from the bottom and protects the pipes. Providing such a protruding member on the bottom surface of the floor panel increases the air resistance of the vehicle body. In addition, due to the minimum ground clearance, it is necessary to raise the cabin floor.
As a result, the vehicle height will have to be raised.

In addition, wiring such as a wire harness, transmission rod, etc. may be required to be provided on the lower surface of the vehicle floor. Similar problems arise in such cases as well.

The present invention was developed in view of these problems, and its purpose is to allow a floor panel with a honeycomb sandwich structure to be easily installed, and to protrude downward from the bottom of the floor panel. The aim is to ensure that wiring, piping, etc. can be completed without any problems.

(Means for solving the problem) In order to achieve this purpose, the present invention has a floor panel with a flat top material, a peripheral part bent upward, and a dish-like shape which is further bent horizontally. It is composed of a lower panel and a honeycomb core sandwiched between the upper and lower panels, and by joining the peripheral edges of the upper and lower panels to each other, a flange is formed around the entire circumference of the floor panel. I have to. Further, a horizontal flange is provided on the side surface of the support member that forms the periphery of the opening to which the floor panel is attached, and the flange of the floor panel is joined to the horizontal flange. Wiring, piping, etc. are accommodated in the grooves formed between the bottom surfaces of the floor panel and the support member.

(Function) With this configuration, the floor panel is assembled separately from the car body assembly process, and on the car body assembly line, the flange of the floor panel is simply joined to the horizontal flange of the support member.
It can be easily assembled to the vehicle body. Since the floor panel has a flange formed on its upper surface side, by assembling it in this way, a groove is formed on the lower surface between it and the support member. Therefore, by accommodating the harness and the pipes in the groove, the wiring, piping, etc. will not protrude from the lower surface of the vehicle body. Moreover, the wiring, piping, etc. accommodated in the groove in this way are protected from both sides by the floor panel and the support member.

(Example) Hereinafter, an example of the present invention will be described using the drawings.

The figures show an embodiment of the vehicle body floor structure of an automobile according to the present invention, with FIG. 1 being an exploded perspective view thereof, and FIGS. 2 and 3 being vertical sectional views in the left-right and front-rear directions thereof. Moreover, FIG. 4 is a bottom view of the main part.

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 middle part of the frame 1 in the longitudinal direction, there are a pair of side sill frames 2 extending in the longitudinal direction on both left and right sides and at positions close to each other in the center.
3 and center frames 3, 3 are provided.
The side sill frames 2 and the center frame 3 are continuous at both front and rear ends with a front cross member lower 4 and a middle cross member lower 5 extending in the left-right direction, respectively. Further, a front frame 6 is integrally provided at the front portion of the front cross member lower 4, and a rear frame 7 is integrally provided at the rear portion of the middle cross member lower 5.

In this way, a large-area opening surrounded by the side sill frame 2, the center frame 3, the front cross member lower 4, and the middle cross member lower 5 is provided in a portion of the frame 1 that corresponds to the floor surface of the vehicle interior in the longitudinal direction. 8,8 are formed.

As is clear from FIGS. 1 and 2, the side sill frame 2 has horizontal flange portions 2a and 2b at the upper end.
It is said to have a channel-like shape that opens upward. A side sill top 9 can be attached to the upper surface of the side sill top 9. This side sill top 9 has a channel shape that opens downward, and its lower end has horizontal flange portions 9a, 9.
b is provided. In this manner, by overlapping and spot welding the flange portions 2a, 9a; 2b, 9b of the side sill frame 2 and side sill upper 9, a side sill 10 having a hollow closed cross-sectional shape is formed. Therefore, the side sill 10 formed in this way
, a horizontal flange 10a protruding from the side surface toward the opening 8 is formed by the joining flange portions 2a and 9a of the side sill frame 2 and the side sill upper 9.

The center frame 3 is also shaped like a channel that opens upward. On the outside, that is, on the side edge on the opening 8 side, a horizontal flange 3 is provided.
a is formed. 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, 3 formed in this way have an upper surface that is a single connel panel 1.
1 at the same time. The tunnel panel 11 has a downwardly open channel shape, and has horizontal flanges 11a, 11a formed on both sides of its lower end, respectively. The flange portion 11a 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 adapted to be joined to the inner surface of the tunnel panel 11. thus,
These tunnel panels 11 and center frame 3,
3, a center tunnel 12 is formed which has reinforcing portions with a hollow closed cross section on both sides. The center tunnel 12 has a horizontal flange 12a formed by the center frames 3a, 11a and protruding from the side toward the opening 8 side.

As is clear from FIGS. 1 and 3, the front cross member lower 4 has a channel shape that opens upward. A horizontal flange portion 4a is provided on the rear side, that is, on the side edge portion on the opening 8 side. Further, a flange portion 4b that slopes upward is provided on the front side edge portion. A lower end portion of a dash panel 13 is attached to the upper surface of the front cross member lower 4. In that case, the rear horizontal flange portion 4a of the front cross member lower 4 is joined to the edge portion of the dash panel 13, and the front flange portion 4b 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 which 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 also has a channel shape that opens upward, and the front side thereof, that is, the opening 8
Horizontal flanges 5a and 5b are formed on the side and 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 the middle cross member 1 with a hollow closed cross-sectional shape.
6 is being formed. Therefore,
The middle cross member 16 is also formed by the flange portion 5a of the middle cross member lower 5 and the flange portion 15a of the rear floor panel 15.
It has a horizontal flange 16a that protrudes toward the opening 8 side.

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

The opening 8 is a flat front floor panel 17.
It is now covered by This front floor panel 17 has an upper surface material 18 and a lower surface material 19.
It has a honeycomb sandwich structure in which a honeycomb core 20 is sandwiched between the honeycomb core 20 and the honeycomb core 20. Upper and lower facing material 1
8 and 19 are formed of thin metal plates.
The lower surface material 19 is thicker than the upper surface material 18. The honeycomb core 20 is made of paper or metal, and the upper and lower face materials 1
8 and 19 by adhesion or welding.

The upper surface material 18 is a flat plate. Further, the lower surface member 19 is shaped like a plate, with its peripheral portion bent upward and further horizontally. These upper and lower face members 18 and 19 are joined to each other at their peripheral edges by spot welding or gluing. 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 front panel 17. When the floor panel 17 is fitted into the opening 8, the flange 17a is placed on the horizontal flanges 10a, 12a, 14a, and 16a provided around the floor panel 17. The flanges are then joined together by spot welding.

When the front floor panel 17 is assembled in this way, the bottom of the lower surface material 19 passes through the opening 8 to the horizontal flanges 10a, 12a, 14a, 16a.
protrudes further downwards. The thickness of the floor panel 17 is such that its bottom surface is approximately flush with the lowest surface of the frame 1, that is, the bottom surface of the side sill frame 2, center frame 3, front cross member lower 4, and middle cross member lower 5. It is said that the thickness is as follows.

When the floor panel 17 is assembled in this way, as shown in FIGS. 2 to 4,
The bottom surface of the floor panel 17 and the bottom surfaces of supporting members surrounding the floor panel 17, that is, the side sills 10, the center tunnel 12, the front cross member 14, and the middle cross member 16
A groove 21 that opens downward is formed between each bottom surface of the groove. The groove 21 extends in the longitudinal direction of the vehicle body on both left and right sides of the floor panel 17, that is, between the side sill 10 and the center tunnel 12. Therefore, in the groove 21,
Pipes 22 such as a fuel pipe and a brake pipe are arranged to connect the front side and the rear side of the vehicle body. The pipes 22 are supported by a plurality of brackets 23 arranged at appropriate intervals in the length direction.
is supported by a cover 24 that covers the lower surface of the opening of the groove 21. Further, the cover 24 is detachably attached to the bottom surfaces of the side sill frame 2 and the center frame 3 by bolts 25, respectively.

In this way, the groove 21 formed between the front floor panel 17, the side sill frame 2, and the center frame 3 serves as a pipe housing portion for the pipes 22.

When forming the floor structure of such an automobile, first, the side sill top 9, tunnel panel 11, dash panel 13,
and assemble the rear floor panel 15. and a separately formed front floor panel 17.
into the opening 8 from above, and the flange 17
a and the horizontal flanges 10a, 12 around the opening 8.
a, 14a, and 16a are welded together. After assembling the vehicle body in this manner, the pipes 22 may be installed and the cover 24 may be attached. Therefore, the assembly work can be easily carried out using a conventional vehicle body assembly line.

The front floor panel 17 assembled in this way is supported around the entire circumference by the side sills 10, the center tunnel 12, the front cross member 14, and the middle cross member 16, which are support members each having a hollow closed cross-sectional shape. will be done. 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, since the load applied to the front floor panel 17 is supported by the flange 17a where the upper and lower panels 18 and 19 are overlapped, a force that tends to cause the panels 18 and 19 to separate is not applied. The strength of the honeycomb sandwich structure is fully utilized. In addition, the upper and lower surface materials 1
8 and 19 are joined to each other at the peripheral edge, thereby preventing water etc. from entering the inside,
Even when the honeycomb core 20 is made of paper, its durability is ensured.

Furthermore, the flange 17a of the floor panel 17 is
Since the flange 17a is formed on the same surface as the upper surface material 18, the plate thickness can be reduced by joining the flange 17a to horizontal flanges 10a, 12a, etc. provided on the side surfaces of supporting members such as the side sill 10 and center tunnel 12. A groove 21 is formed between the bottom surface of the large floor panel 17 and the bottom surface of the support member. Therefore, by using the groove 21 as a housing section for the pipes, the pipes 22 are prevented from protruding downward from the bottom surface of the floor panel 17.
Moreover, since the pipes 22 are protected on both sides by the highly rigid floor panel 17 and supporting members such as the side sills 10 and center tunnel 12, they can be protected even when the car runs over a step or the like. , the pipes 22 will not be damaged. Then, by covering the groove 21 with the cover 24, the bottom surface of the vehicle body becomes almost smooth and its air resistance is reduced.

In addition, a flange 1 is provided on the upper surface side of the floor panel 17.
By providing 7a, the upper surface becomes level-free, and the floor surface of the vehicle compartment can be made flat.

In addition, in the above embodiment, the floor panel 1
7, the side sills 10, and the center tunnel 12 are designed to serve as pipe accommodating parts. 14 or the groove 21 between it and the middle cross member 16 may also be used as a pipe accommodating section.

Further, the groove 21 can be used not only for piping, but also as a housing section for wiring for a tail lamp, etc., and a transmission rod for a four-wheel steering device.

Furthermore, in the above embodiment, the floor panel 1
7 is attached from above the opening 8, but it can also be attached from below. In that case, the flange 17a of the floor panel 17 may be joined to the lower surface of the horizontal flange of the support member.

In addition, the upper and lower surface materials 1 of the floor panel 17
8 and 19 can also be formed from fiber-reinforced plastic or the like. In this way, the weight of the floor panel 17 can be further reduced. In such a case, the floor panel 17 flange 17a
may be joined to the horizontal flange of the support member by gluing or bolting.

(Effect of the invention) As is clear from the above explanation, according to the invention, a floor panel having a honeycomb sandwich structure is provided with a flange continuous to the upper surface thereof, and the flange is provided on the side surface of the supporting member. Since it is joined to the horizontal flange, the floor panel can be easily installed without compromising its strength, and a groove that opens downward is formed between the bottom surface of the floor panel and the bottom surface of the support member. will be done. By using the groove as a storage area for wiring, piping, etc., wiring, piping, etc. can be prevented from protruding from the bottom of the vehicle body, the bottom of the passenger compartment can be lowered, and air resistance can be reduced. becomes possible. Moreover, the wiring
Piping and the like are now protected by the highly rigid floor panel and support member.

[Brief explanation of drawings]

FIG. 1 is an exploded perspective view showing an embodiment of the vehicle body floor structure according to the present invention, FIG. 2 is a cross-sectional view of the floor structure taken along the - line in FIG. 1, and FIG. is a sectional view of the floor structure taken along the - line in FIG.
The figure is a bottom view of the main parts of the floor section viewed from the bottom side. 1...Frame, 8...Opening, 10...Side sill (supporting member), 10a...Horizontal flange, 1
2... Center tunnel (supporting member), 12a...
Horizontal flange, 14... Front cross member (support member), 14a... Horizontal flange, 16...
Middle cross member (support member), 16a...Horizontal flange, 17...Front floor panel, 1
7a...Flange, 18...Top material, 19...Bottom material, 20...Honeycomb core, 21...Groove, 22
...Pipes (piping), 24...Cover.

Claims (1)

[Claims for Utility Model Registration] A flat top material and a dish-shaped bottom material whose periphery is bent upward and then horizontally are joined together at the periphery with a honeycomb core sandwiched between them. This forms a floor panel with a honeycomb sand German structure having flanges around the entire circumference, and the flanges of the floor panel are attached to horizontal lines provided on the sides of the support member forming the periphery of the opening to which the floor panel is attached. The floor panel is fixed to the support member by being joined to the flange so that the bottom surface of the floor panel protrudes below the horizontal flange, and a groove is formed between the bottom surfaces of the floor panel and the support member. A car body floor structure, characterized in that the structure is a housing part for wiring, piping, etc.