JP2004352080A - Reinforcement structure for floor panel - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a reinforcement structure for a floor panel realizing reduction of working steps and a working time, while maintaining strength of the conventional product and shortening of. <P>SOLUTION: A tunnel part 3 is arranged at a central part of the floor panel 2 of an automobile 1. A cross member 4 is arranged on an upper surface of the floor panel 2 in a vehicle width direction. A tunnel reinforcement plate 9 is extended by integrally molding a side part flange 8 to both left/right side parts of the tunnel reinforcement plate 9 at a position crossing with the cross member 4. In the tunnel reinforcement plate 9, a seat mounting part 5 is provided on a superposed surface of the upper surface of the cross member 4 and the side part flange 8, and a seat rail of the seat, the tunnel reinforcement plate 9 and the cross member 4 are tightened at a seat mounting hole 5a by a bolt. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a reinforcing structure for a floor panel of an automobile having a tunnel portion disposed at the front and back of a center portion of the floor panel.
[0002]
[Prior art]
As shown in FIG. 10, there is a vehicle floor panel 51 in which a portion that extends in the front-rear direction of the vehicle body and protrudes upward in a tunnel shape is formed. This projecting portion is called a so-called tunnel portion, and a technique relating to a reinforcing structure of the tunnel portion 52 is disclosed in Japanese Patent Application Laid-Open No. 2002-154459 (Patent Document 1).
In this publication, a cross member 53 extending in the vehicle width direction is attached to a portion provided in the tunnel portion 52 and where the shift lever is substantially disposed, and a tunnel reinforcing plate 54 is disposed on the upper portion of the tunnel portion 52. It extends over 53. A seat mounting bracket 55 is provided between the tunnel reinforcing plate 54 and the cross member 53 so as to intersect the tunnel reinforcing plate 54, that is, in the same direction as the cross member 53.
[0003]
[Patent Document 1]
Japanese Patent Laid-Open No. 2002-15459 (see FIG. 2, abstract)
[Patent Document 2]
Japanese Utility Model Publication No. 3-27911 (see FIG. 1, third column, lines 4 to 14)
[0004]
[Problems to be solved by the invention]
The purpose of extending the tunnel reinforcing plate 54 shown in FIG. 10 to the rear of the cross member 53 is to reinforce the shift portion. The purpose of providing the seat mounting bracket 55 is to adjust the height of the seat mounting portion to the height of the seat rail for mounting the seat. However, in such a structure, the seat mounting bracket 55 is large, which is against the request for weight reduction of the vehicle body. In addition, there are problems such as work steps for mounting the seat mounting bracket 55, an increase in time, and a cost increase associated therewith.
[0005]
In view of such circumstances, it is an object of the present invention to provide a reinforcing structure for a floor panel that reduces the work process and shortens the work time while maintaining the strength of the conventional product.
[0006]
[Means for Solving the Problems]
In order to achieve the above object, a reinforcing structure for a floor panel according to the present invention has a cross member disposed in the vehicle width direction of a floor panel in which a tunnel portion is provided in the front-rear direction of the vehicle body, and straddles the cross member. In the reinforcing structure of an automobile floor panel in which a tunnel reinforcing member is crossed on the surface of the tunnel portion and a seat mounting portion is provided on the cross member, the tunnel reinforcing member is flanged to the seat mounting portion of the cross member. The sheet attachment portion is supported by a cross member together with the extension portion of the tunnel reinforcing member.
The reinforcing structure of the floor panel is formed by forming a bolt hole in a seat attachment portion of the cross member and an extension portion of the tunnel reinforcement member, a seat rail disposed in the seat attachment portion, and the attachment portion and the extension portion with bolts. Can be concluded.
Further, the reinforcing structure of the floor panel increases in rigidity when the extended portion of the tunnel reinforcing member is extended to the front side of the cross member.
Further, the reinforcing structure of the floor panel is configured such that an upward step surface is provided on the outer side in the vehicle width direction in the tunnel portion located in front of and behind the cross member, and the extension portion of the tunnel reinforcing member is extended from the front portion of the step surface to the cross member. The extension portion can be extended to the rear side of the step surface across the surface, and the extension portion can be joined to the step surface.
The reinforcement structure of the said floor panel can provide the attaching part of a shift lever on the said tunnel reinforcement member of the site | part where the said tunnel reinforcement member and a cross member cross | intersect.
[0007]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, a reinforcing structure of a floor panel according to an embodiment of the present invention will be described with reference to the drawings.
FIG. 1 is a perspective view of an automobile adopting a floor panel reinforcing structure according to the present invention, FIG. 2 is a perspective view of the floor panel of the automobile, and FIG. 3 is a front view of the floor panel. It is an expansion perspective view of the tunnel part located.
As shown in the figure, the automobile 1 includes a floor panel 2 that constitutes the lower part of the vehicle body, and a tunnel portion 3 that protrudes upward extends along the front-rear direction of the vehicle at the center in the vehicle width direction of the floor panel 2. It is arranged.
[0008]
On the upper surface of the floor panel 2, a cross member 4 shown in FIG. 4 having a U-shaped cross section is arranged with the U-shaped opening side facing downward, and extends to the left and right sides of the vehicle body. The cross member 4 is arranged so as to cross the tunnel portion 3. A concave portion 4a is formed in the middle portion of the cross member 4 so as to straddle the tunnel portion 3, and a flange 4b is formed at the end portion in the front-rear direction (the rear end side is not shown).
A tunnel reinforcing plate 9 shown in FIG. 5 is disposed on the upper surface side of the cross member 4 and in the center in the vehicle width direction so as to intersect with the cross member 4.
[0009]
The tunnel reinforcing plate 9 has a front end arranged at the lower part of the dash panel, and a rear end extending across the cross member 4 so as to straddle the cross member 4. Further, the side portion of the tunnel reinforcing plate 9 that is overlapped with the cross member 4 at a position intersecting with the cross member 4 and at the height position of the front mounting portion of the seat rail at the left and right side portions of the tunnel reinforcing plate 9. The flange 8 is extended to the outside in the vehicle width direction by integral molding. Then, the tunnel reinforcing plate 9 is overlapped so that the side flange 8 straddles the cross member 4, and the sheet attachment portion 5 is provided on the upper surface of the cross member 4 and the overlapping surface of the side flange 8. Is formed with a sheet mounting hole 5a.
[0010]
As shown in FIG. 3, in the tunnel part 3, it protrudes in the horizontal direction outward in the vehicle width direction from the left and right tunnel parts 3 of the floor panel 2 at sites located on the front side and the rear side of the cross member 4. A step surface 10 is provided on the upper surface of the stepped portion. The above-described side flange 8 of the tunnel reinforcing plate 9 extends from the seat mounting portion 5 of the cross member 4 to the front portion 10a of the step surface 10 over the front surface 4c of the cross member 4, and the rear side of the cross member 4 is the cross member. 4 extends from the rear surface 4d to the rear portion 10b of the step surface 10, and the side flange portion 8 is fixed to the step surface 10 by welding.
[0011]
On the upper surface of the tunnel reinforcing plate 9, four upright pins are arranged in a square shape with mounting bolts 14 to form shift lever mounting portions (not shown).
As shown in FIG. 6, a hanger bracket 18 for suspending a muffler is joined to the lower part of the floor panel 2 at the lower part of the cross member 4 in the left and right center part of the vehicle body. The muffler hanger bracket 18 forms a bag-like cross section with the floor panel 2.
[0012]
FIG. 6 shows in detail the spot welded portions of the tunnel reinforcing plate 9, the cross member 4, the floor panel 2, and the muffler hanger bracket 18. A triangle mark in the drawing is a three-layer spot welded portion of the flange 4b of the cross member 4, the floor panel 2, and the muffler hanger bracket 18. A circle mark is a two-layer spot welded portion composed of the tunnel reinforcing plate 9 and the floor panel 2, and a cross mark is a two-layer spot welded portion formed by the cross member 4 and the floor panel 2. As indicated by Δ, at the portion where the tunnel reinforcing plate 9 and the cross member 4 cross each other, these members are arranged with a space therebetween, so that the tunnel reinforcing plate 9 and the cross member 4 are not joined.
[0013]
FIG. 7 shows a cross section of the seat mounting portion 5 of the front seat. The seat mounting portion 5 located on the side flange 8 of the tunnel reinforcing plate 9 is provided with a two-layer structure of the upper tunnel reinforcing plate 9 and the lower cross member 4, and in these portions, these members are superposed. It is in. A welding nut 11 is fixed to the back surface of the cross member 4 in the mounting hole 5a of the seat rail 12 for fixing the seat, and the cross member 4, the tunnel reinforcing plate 9 and the seat rail 12 are fastened by bolts 13. A pin 16 provided close to the bolt 13 and protruding upward is a positioning pin 16 provided on the seat rail 12 and is inserted into a positioning hole 15 formed in the tunnel reinforcing plate 9 and the cross member 4. Is done.
[0014]
Next, the effect | action of the reinforcement structure of the floor panel of embodiment of this invention is demonstrated.
8A and 8B show a state in which the seat rail mounting portion 5 is not bolted unlike the present embodiment, and FIG. 8A shows the tunnel reinforcing plate 9 from the front. In this state, no load is applied, and (B) shows a state in which a load from the front is applied to the tunnel reinforcing plate 9.
When a load from the front of the vehicle body is applied to the tunnel reinforcing plate 9, the floor panel 2 and the tunnel reinforcing plate 9 buckle if the tunnel reinforcing plate 9 and the cross member 4 are not bolted. At that time, if the load is large, if the spot welds t are peeled off by the load, there is a possibility that a phenomenon of floating above the cross member 4 of the tunnel reinforcing plate 9 may occur due to buckling.
[0015]
Therefore, in the present embodiment, when the cross member 4, the tunnel reinforcing plate 9, and the seat rail 12 for attaching the seat are fastened with the bolts 13 and the nuts 11, as shown in FIG. The rigidity for receiving the input of the tunnel reinforcing plate 9 is increased, and the deformation amount of the tunnel reinforcing plate 9 is reduced.
Furthermore, when an external force is applied to the tunnel reinforcing member from the front, the flange-shaped side flange 8 that protrudes in the vehicle width direction is disposed on the cross member 4, so that the load is applied to the cross member 4 in the lateral direction. It is possible to disperse, and the buckling of the tunnel reinforcing plate can be prevented or reduced. Further, the side flange 8 is extended from the seat mounting portion 5 to the front surface 4c of the cross member 4 and the front portion 10a of the step surface 10 to further distribute the load in the forward direction and improve the rigidity. Further, the side flange 8 is extended from the seat mounting portion 5 to the rear surface 4 d of the cross member 4 and the rear portion 10 b of the step surface 10 to reinforce the tunnel portion 3.
[0016]
Since the bolt 13 that is the fastening portion between the tunnel reinforcing plate 9 and the cross member 4 is originally used for the attachment portion of the seat rail 12, there is no need to separately provide a fastening means for the tunnel reinforcing plate 9 and the cross member 4, The tunnel reinforcing plate 9 has a function as a reinforcing member for improving the rigidity of the shift portion and external force from the front of the vehicle. If the side flange 8 of the tunnel reinforcing plate 9 is not extended to the attachment portion of the seat rail 12 and only the cross member 4 and the seat rail 12 are attached, the cross member 4 and the welding nut 11 shown in FIG. Since one additional reinforcing plate is required, the number of parts can be eliminated.
It is also conceivable that the tunnel reinforcing plate 9 is spot welded together with the cross member 4, the floor panel 2, and the muffler hanger bracket 18 at the portion indicated by Δ in the drawing shown in FIG. 6. However, in recent years, since many plating materials are used, it is difficult to weld four panels together. Even if welding is possible, as shown in FIG. 9A, in order to overlap the tunnel reinforcing plate 9 with the welded portion t, a bent portion (see the imaginary line 9) must be formed in the tunnel reinforcing plate 9. Therefore, the stress tends to concentrate on the bent portion, and there is a possibility that the bent portion will be broken when a load is applied. Further, as shown in FIG. 9B, it is conceivable that the tunnel reinforcing plate 9 and the cross member 4 are welded and then attached to the floor panel 2. However, the welded portion (the point t in FIG. 9A) of the floor panel 2, the cross member 4 and the muffler hanger bracket 18 to be performed in the next process becomes a bag shape in the tunnel reinforcing plate 9, making welding difficult. . Therefore, in this embodiment, the tunnel reinforcing plate 9 is attached to the tunnel portion 3 later.
[0017]
Although the embodiments of the present invention have been described above, the present invention is of course not limited thereto, and various modifications and changes can be made based on the technical idea of the present invention.
[0018]
【The invention's effect】
As described above, according to the reinforcing structure of the floor panel of the present invention, the cross member is disposed in the vehicle width direction of the floor panel in which the tunnel portion is provided in the front-rear direction of the vehicle body and straddles the cross member. In the reinforcing structure of an automobile floor panel in which a tunnel reinforcing member is crossed on the tunnel portion surface and a seat mounting portion is provided on the cross member, the tunnel reinforcing member is flanged to the seat mounting portion of the cross member. The seat attachment portion is supported by the cross member together with the extension portion of the tunnel reinforcing member. As a result, the tunnel reinforcing member is extended to the seat mounting portion on the cross member, so that the seat mounting surface can be made into a two-layer structure. Plate) can be omitted.
The reinforcing structure of the floor panel is such that a bolt hole is formed in a seat mounting portion of the cross member and an extension portion of the tunnel reinforcing member, and a seat rail disposed in the seat mounting portion, and the mounting portion and the extension portion are bolted. By fastening, the tunnel reinforcement member can be prevented from buckling when a load is applied to the tunnel portion from the front side. In addition, since the connection of the tunnel reinforcement member, the cross member, and the seat mounting portion is substituted, the welding portion of the tunnel reinforcement member and the cross member and the dedicated fastening means can be eliminated, and the connection means of the tunnel reinforcement member and the cross member It is not necessary to provide it exclusively.
In the reinforcing structure of the floor panel, when the extension portion of the tunnel reinforcement member is extended to the front surface side of the cross member, when the external force is applied to the tunnel reinforcement member from the front, the external force is extended to the front side of the cross member It can disperse | distribute and can prevent the buckling of a tunnel reinforcement board.
In the reinforcing structure of the floor panel, an upward step surface is provided on the outer side in the vehicle width direction in the tunnel portion positioned in front of and behind the cross member, and the extension portion of the tunnel reinforcing member extends over the cross member from the front portion of the step surface. Thus, since the extension portion is extended to the rear side of the step surface and the extension portion is joined to the step surface, the tunnel portion positioned in front of and behind the cross member can be reinforced together with the cross member.
Since the reinforcing structure of the floor panel is provided with the shift lever mounting portion on the tunnel reinforcing member at the portion where the tunnel reinforcing member and the cross member intersect, the rigidity of the shift lever portion can be further increased.
[Brief description of the drawings]
FIG. 1 is a perspective view of an automobile adopting a floor panel reinforcing structure according to the present invention.
2 is a front perspective view of the floor panel of the automobile of FIG. 1. FIG.
3 is an enlarged perspective view of a state in which a cross member and a tunnel reinforcing plate are disposed in a tunnel portion located on the front side of the floor panel of FIG. 2. FIG.
4 is a perspective view of a cross member that extends to the left and right sides in the vehicle width direction of the floor panel shown in FIG. 2; FIG.
5 is an enlarged perspective view of a tunnel reinforcing plate disposed on the tunnel portion of the floor panel shown in FIG. 2. FIG.
FIG. 6 shows a welded portion of a floor panel, a muffler hanger bracket, a tunnel reinforcing plate, and a cross member.
7 is a cross-sectional view taken along line AA in FIG.
FIGS. 8A and 8B are diagrams for explaining the operation of the reinforcing structure of the floor panel according to the embodiment of the present invention, in which FIGS. 8A and 9B are comparative examples, and in detail, FIG. Is a side view when no external force is applied in a state where the seat rail mounting portion of the seat is not bolted, and (B) is a side view in a state where the load is applied to the reinforcing panel. ) Shows a state in which the reinforcing panel of the present embodiment and the seat rail are bolted together, and shows a state in which the load of the reinforcing panel is applied.
9A is a side view of a reinforcing structure of a floor panel according to a comparative example of the embodiment of the present invention, and FIG. 9B is a side view of a floor panel according to another comparative example of the embodiment of the present invention. It is a side view of a reinforcement structure.
FIG. 10 is a perspective view of a tunnel portion corresponding to FIG. 3 of the present embodiment, showing a conventional reinforcing structure of a floor panel.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Automobile 2 Floor panel 3 Tunnel part 4 Cross member 4b Flange 5 Seat attachment part 8 Side flange 9 Tunnel reinforcement board 10 Step surface 11 Welding nut 12 Seat rail 13 Bolt 14 Attachment bolt 18 Muffler hanger bracket

Claims (5)

A cross member is disposed in the vehicle width direction of a floor panel provided with a tunnel portion in the front-rear direction of the vehicle body, and a tunnel reinforcing member is crossed on the tunnel portion surface so as to straddle the cross member, and the cross member In the reinforcing structure of the floor panel of the automobile provided with the seat mounting portion on the vehicle, the tunnel reinforcing member is extended to the seat mounting portion of the cross member in a flange shape, and the cross member is combined with the extension portion of the tunnel reinforcing member. A floor panel reinforcement structure characterized by supporting a seat mounting portion. Bolt holes are formed in the seat attachment portion of the cross member and the extension portion of the tunnel reinforcing member, and the seat rail disposed in the seat attachment portion, the attachment portion and the extension portion are fastened with bolts. The reinforcement structure of the floor panel of Claim 1. The reinforcement structure for a floor panel according to claim 1 or 2, wherein the extension portion of the tunnel reinforcement member is extended to the front side of the cross member. The tunnel portion positioned before and after the cross member is provided with an upward step surface on the outer side in the vehicle width direction, and the extension portion of the tunnel reinforcing member extends from the front portion of the step surface to the cross member to the rear side of the step surface. The reinforcing structure for a floor panel according to any one of claims 1 to 3, wherein the extension portion is extended and the extension portion is joined to a stepped surface. The reinforcing structure for a floor panel according to any one of claims 1 to 4, wherein a shift lever mounting portion is provided on the tunnel reinforcing member at a portion where the tunnel reinforcing member and the cross member intersect.

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