JP2004314673A - Vehicle body rear part structure - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a vehicle body rear structure capable of securing the capacity of a fuel tank, and securing an accommodation space of an auxiliary tire while preventing enlargement of a vehicle body. <P>SOLUTION: An inclined plate 10 is suspended backward and downward of a vehicle from a front position of the vehicle from a spare pan 3 of a rear floor panel 1, and a bottom end 10b of the inclined plate 10 is coupled with a front side vertical wall 3b of the spare pan 3. A first closing section 11 is formed between the inclined plate 10, a front vertical wall 3b of the spare pan 3, and the rear floor panel 1, so that torsional rigidity of the front vertical wall 3b of the spare pan 3 is increased by the first closing section 11, and interference to a fuel tank 5 can be prevented while securing a collapsing space required for absorbing energy of rear face collision. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

[0001]
TECHNICAL FIELD OF THE INVENTION
The present invention relates to a vehicle body rear structure, and more particularly, to a vehicle body rear structure provided with a spare pan recessed in a vehicle rear portion of a rear floor panel.
[0002]
[Prior art]
Generally, in a vehicle such as an automobile, a spare pan is formed in a rear portion of the rear floor panel, and auxiliary tires such as spare tires are stored in the spare pan. (See, for example, Patent Document 1).
[0003]
[Patent Document 1]
JP 2001-138957 A (Page 3, FIG. 1)
[0004]
[Problems to be solved by the invention]
However, in such a conventional spare pan, a rear portion of the rear floor panel is recessed, and a front vertical wall thereof is projected forward to secure a storage space for auxiliary tires. When input, the front vertical wall of the spare pan pushes down the rear part of the spare pan while rotating the lower end of the front part of the spare pan centering on the upper end part intersecting the rear floor panel toward the front of the vehicle.
[0005]
On the other hand, a fuel tank is installed below the rear floor panel in front of the spare pan, and when the fuel tank moves rearward due to inertial force at the time of a rear collision, the fuel tank is displaced forward to the rearward moving fuel tank. The lower corner of the front vertical wall of the spare pan interferes.
[0006]
In order to avoid the interference between the fuel tank and the spare pan, the rear wall position of the fuel tank must be moved to the front of the vehicle, or the formation position of the spare pan must be moved to the rear of the vehicle. When the vehicle moves in front of the vehicle, the tank capacity decreases. On the other hand, when the spare pan moves rearward, the rear portion of the vehicle body extends to the rear of the vehicle, resulting in an increase in the size of the entire vehicle body.
[0007]
Accordingly, the present invention provides a vehicle body rear structure capable of securing the capacity of the fuel tank and securing a storage space for the auxiliary tires while avoiding an increase in the size of the vehicle body.
[0008]
[Means for Solving the Problems]
According to the present invention, by inclining the inclined plate toward the vehicle rearward and downward from the front position of the vehicle relative to the spare pan on the rear floor panel, and connecting the lower end of the inclined plate to the front vertical wall of the spare pan, A first closed section is formed between the inclined plate, the front vertical wall of the spare pan, and the rear floor panel.
[0009]
【The invention's effect】
According to the present invention, the front vertical wall of the spare pan is supported by the first closed cross section, and the torsional rigidity of the front vertical wall can be increased. For this reason, even when a collision load is input from the rear of the vehicle due to a rear collision, the moment acting about the lower end of the inclined plate constituting the first closed cross section acts on the spare pan, and the spare pan is moved upward in the rear part of the vehicle. Can be displaced to lift.
[0010]
Therefore, the crushing space necessary for absorbing the energy of the rear collision can be sufficiently secured, and the front vertical wall of the spare pan suppresses the displacement to the front of the vehicle by increasing the torsional rigidity of the first closed cross-section, so that the front pan of the spare pan during the rear collision can be prevented. Since interference with the fuel tank can be prevented, the capacity of the fuel tank can be ensured, and the storage space for the auxiliary tire can be ensured while avoiding an increase in the size of the vehicle body.
[0011]
BEST MODE FOR CARRYING OUT THE INVENTION
Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.
[0012]
FIG. 1 shows a first embodiment of a vehicle body rear structure according to the present invention, and FIG. 1 is a sectional view of a main part of the vehicle body rear portion.
[0013]
As shown in FIG. 1, the rear structure of the vehicle body of this embodiment is obtained by cutting a rear portion of a rear floor panel 1 and fitting a spare pan 3 for accommodating an auxiliary tire 2 such as a spare tire or a tempered tire into the cut portion 1a. The peripheral flange 3a of the spare pan 3 is spot-welded to the upper side of the cut-out portion 1a of the rear floor panel 1 and the upper side of the rear end cross portion 4 having a closed cross section.
[0014]
As a result, the spare pan 3 is provided in a recessed state on the rear portion of the rear floor panel 1 in the vehicle, and the front vertical wall 3b of the spare pan 3 once suspends substantially vertically from its upper end, and then descends vertically. A lower portion becomes a front protruding portion 3e protruding forward of the vehicle via the inclined portion 3d, and the front end portion of the auxiliary tire 2 is stored in the front protruding portion 3e.
[0015]
In this embodiment, the rear vertical wall 3f of the spare pan 3 is in a substantially vertical state, and the lower surface 3g of the spare pan 3 is slightly inclined forward so that the front of the vehicle is downward. A fuel tank 5 is installed below the rear floor panel 1 in front of the vehicle with respect to the spare pan 3 and at a predetermined interval S between the front vertical wall 3b.
[0016]
Here, in this embodiment, the inclined plate 10 is vertically installed from the vehicle front position P1 to the vehicle rearward and downward with respect to the spare pan 3 of the rear floor panel 1, and the lower end of the inclined plate 10 is positioned in front of the spare pan 3. A first closed section 11 is formed between the inclined plate 10, the front vertical wall 3 b of the spare pan 3, and the rear floor panel 1.
[0017]
The inclined plate 10 is thicker than the rear floor panel 1 supporting the upper and lower ends thereof and the front vertical wall 3b of the spare pan 3 to increase the rigidity.
[0018]
The upper end of the inclined plate 10 is bent parallel to the rear floor panel 1 to form a flange 10a. The flange 10a is spot-welded to the lower surface (point P1) of the rear floor panel 1 and the lower end of the inclined plate 10 is formed. 10b is spot-welded at the point P2 to the middle of the front protruding portion 3e of the front vertical wall 3b.
[0019]
According to the vehicle body rear structure of the first embodiment, the spare pan 3 has its front vertical wall 3b supported by the first rigid section 11 having high rigidity. The center P3 can be disposed L ahead of the connection point P2 of the floor pan 3 in front of the vehicle.
[0020]
Accordingly, when a collision load F1 is input from the rear of the vehicle at the time of a rear collision, the torsional rigidity is improved by the first closed section 11 above the connection point P2 while suppressing the forward displacement thereof. As shown by the broken line in the figure, the portion below the joining point P2 is deformed first by the moment M1, and the lower surface 3g of the spare pan 3 is deformed so that the rear portion of the vehicle is lifted upward, thereby absorbing energy at the time of a rear collision. The necessary crushing space can be secured at the rear of the vehicle.
[0021]
Accordingly, the front vertical wall 3b of the spare pan 3 suppresses the displacement of the first closed cross-section 11 to the front due to an increase in the torsional rigidity of the first closed section 11, and prevents interference with the fuel tank 5 that moves rearward due to inertia at the time of a rear collision. Therefore, the capacity of the fuel tank 5 can be ensured, and the storage space for the auxiliary tire 2 can be sufficiently ensured while avoiding an increase in the size of the vehicle body.
[0022]
By the way, in the first embodiment, in addition to the above-mentioned functions and effects, the inclined plate 10 has a greater rigidity than the rear floor panel 1 supporting the upper and lower ends thereof and the front vertical wall 3b of the spare pan 3. Since the connection point P1 at the upper end of 10 can be positioned further to the rear of the vehicle, that is, in a direction approaching the spare pan 3, the layout of the inclined plate 10 can be easily determined.
[0023]
FIG. 2 shows a second embodiment of the present invention, in which the same components as those in the first embodiment are denoted by the same reference numerals, and redundant description will be omitted. FIG. It is.
[0024]
The rear structure of the vehicle body according to the second embodiment has, in addition to the structure of the first embodiment, a crossover between the inclined plate 10 and the lower surface of the rear floor panel 1 in the first closed cross section 11 as shown in FIG. The plates 12 are connected to each other, and a second closed section 13 is formed between the inclined plate 10, the rear floor panel 1, and the cross plate 12.
[0025]
That is, the cross plate 12 is bent in an L shape, and a flange 12a formed at one end thereof is spot-welded to an intermediate portion of the inclined plate 10, and a flange 12b formed at the other end is connected to the rear floor panel 1. Is spot-welded to the lower surface of the second section, and the second closed section 13 has a substantially rectangular shape.
[0026]
According to the vehicle body rear structure of the second embodiment having the above-described configuration, the second closed cross-sectional portion 13 formed by the cross plate 12 has the same function as that of the first embodiment. , The torsion rigidity of the spare pan 3 in the front part of the vehicle can be increased.
[0027]
Therefore, the torsional deformation of the first closed section 11 can be more reliably suppressed, and the forward displacement of the front vertical wall 3b of the spare pan 3 is more efficiently suppressed, so that interference with the fuel tank 5 at the time of a rear collision is more reliably achieved. Can be blocked.
[0028]
Further, the rigidity in the vehicle width direction can be improved by the second closed cross-section 13 even when an input from a suspension (not shown) is received by the rear floor panel 1, so that the running stability can be improved.
[0029]
Further, in the second embodiment, in addition to the above-described functions and effects, since the second closed section 13 is formed in the first closed section 11, the torsional rigidity of the first closed section 11 is effectively improved. At the same time, the cross plate 12 is prevented from protruding in the direction of the fuel tank 5 to facilitate the layout.
[0030]
FIG. 3 shows a third embodiment of the present invention, in which the same components as those of the second embodiment are denoted by the same reference numerals and the description thereof will not be repeated. FIG. It is.
[0031]
The vehicle body rear structure according to the third embodiment includes, in addition to the configuration of the second embodiment, a front vertical wall 3b of a spare pan 3 having a first closed section 11 as shown in FIG. The space from the joint P2 to the rear floor panel 1 is formed linearly.
[0032]
With the above structure, according to the vehicle body rear structure of the third embodiment, the same function as that of the second embodiment can be achieved, as well as the joint point P2 of the front vertical wall 3b of the spare pan 3 at the time of a rear collision. When the lower portion is deformed, the portion above the connection point P2 is linear, so that the stress F generated at the time of deformation can be received in the plane, so that the torsional rigidity of the first closed section 11 is further increased. be able to.
[0033]
In addition, since a portion above the connecting point P2 of the front vertical wall 3b is linear, when the distance between the connecting point P2 and the cross-sectional center P4 of the first closed cross-sectional portion 11 is L1, L1> L. (L: see FIG. 1), the cross-sectional center P4 of the first closed cross-sectional portion 11 can be positioned further forward of the vehicle, and the lower portion than the connection point P2 of the front vertical wall 3b can be more reliably deformed. Can be.
[0034]
In the third embodiment, the second embodiment, that is, a case in which the invention is applied to a vehicle body rear structure having the cross plate 12 is disclosed. However, the present invention is not limited to this, and the cross plate 12 of the first embodiment is not provided. The third embodiment can be applied to a vehicle body rear structure.
[0035]
FIG. 4 shows a fourth embodiment of the present invention, in which the same components as those in the first embodiment are denoted by the same reference numerals, and redundant description will be omitted. FIG. It is.
[0036]
In the rear body structure of the third embodiment, the inclined plate 10, a portion of the front vertical wall 3 b of the spare pan 3 extending from the vertically hanging portion 3 c to the inclined portion 3 d, and the first closed section 11 of the rear floor panel 1 are formed. The part 1b and the light metal such as an aluminum alloy are integrally formed by extrusion molding.
[0037]
When extruding the first closed section 11 in this manner, flanges 10a and 10b are formed on the upper and lower ends of the inclined plate 10, the flange 10a is provided on the upper surface of the rear floor panel 1, and the flange 10b is provided on the front side. The vertical wall 3b is connected to the front protruding portion 3e via a fastening means such as a bolt, nut, rivet or adhesive (not shown).
[0038]
According to the vehicle body rear structure of the fourth embodiment with the above configuration, the members constituting the first closed cross section 11, that is, the inclined plate 10, the front vertical wall 3 b, and the rear floor panel 1 b are integrally extruded and formed. Thereby, the first closed section 11 can be formed as an integrally molded product without spot welding.
[0039]
Therefore, since the first closed section 11 thus integrally formed does not deform at the welded portion, the torsional rigidity is greatly increased, and the forward movement of the spare pan 3 at the time of a rear collision is more effectively performed. Thus, the fuel tank 5 can be reliably protected.
[0040]
Although the fourth embodiment discloses a case where the present invention is applied to the rear body structure of the first embodiment in which the cross plate 12 is not provided, the fourth embodiment also applies to the rear body structure of the second embodiment in which the cross plate 12 is provided. The cross plate 12 can be extruded integrally with the first closed section 11.
[0041]
By the way, the vehicle body rear structure of the present invention has been described by taking the first to fourth embodiments as examples, but various other embodiments may be employed without departing from the scope of the present invention without being limited to these embodiments. Can be.
[Brief description of the drawings]
FIG. 1 is a sectional view of a main part of a rear portion of a vehicle body, showing a first embodiment of the present invention.
FIG. 2 is a sectional view of a main part of a rear part of a vehicle body, showing a second embodiment of the present invention.
FIG. 3 is a sectional view of a main part of a rear portion of a vehicle body, showing a third embodiment of the present invention.
FIG. 4 is a sectional view of a main part of a rear portion of a vehicle body, showing a fourth embodiment of the present invention.
[Explanation of symbols]
REFERENCE SIGNS LIST 1 rear floor panel 2 auxiliary tire 3 spare pan 3 b front vertical wall 5 fuel tank 10 inclined plate 11 first closed section 12 cross plate 13 second closed section

Claims (5)

In a vehicle body rear structure in which a spare pan for storing auxiliary tires is recessed in a rear part of the rear floor panel of the vehicle and a fuel tank is provided below the rear floor panel in front of the vehicle with respect to the spare pan,
An inclined plate is suspended from the front position of the rear floor panel toward the vehicle rearward and downward from the vehicle front position, and the lower end of the inclined plate is connected to the front vertical wall of the spare pan. A rear structure of a vehicle body, wherein a first closed cross section is formed between a vertical wall and a rear floor panel. The vehicle body rear structure according to claim 1, wherein the inclined plate has a greater rigidity than a rear floor panel supporting upper and lower ends thereof and a front vertical wall of a spare pan. A cross plate is joined across the inclined plate and the lower surface of the rear floor panel in the first closed cross section, and a second closed cross section is formed between the inclined plate, the rear floor panel, and the cross plate. The vehicle body rear structure according to claim 1 or 2, wherein The front vertical wall of the spare pan having the first closed cross section is formed in a straight line from the joint of the inclined plate to the rear floor panel. Rear body structure. The inclined plate, the front vertical wall of the spare pan, and the portion of the rear floor panel forming the first closed cross-section are integrally formed by extrusion molding, according to any one of claims 1 to 4, wherein Rear body structure.

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