JP2008087650A - Floor structure for automobile - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a floor structure for an automobile capable of avoiding the deterioration of productivity and an increase in the cost of a floor panel while ensuring a spare tire storage space and vehicle body rigidity. <P>SOLUTION: A step 1j forming a step-down shape from a front side floor 1e is formed on the front vertical wall 1g of a spare tire storage part 1d. An approximately L shape cross member 15 is bonded to the lower surface of the step 1j so as to be opened to a rear side, and an approximately reverse L shape reinforcement member 16 is bonded to the upper surface of the step 1j so as to be opened to a front side. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a vehicle floor structure in which a spare tire storage portion is recessed in a rear end portion of a floor panel forming a vehicle compartment.

  As a rear body structure of an automobile, a fuel tank is disposed below the rear floor panel, a center cross member that supports a rear suspension is disposed behind the fuel tank, and a spare tire storage unit is disposed behind the center cross member. In some cases, a seat rail, a seat belt anchor, or the like is disposed on the center cross member.

  On the other hand, in a small vehicle having a restriction on the full length frame of the vehicle body, the center cross member is moved rearward in order to increase the front and rear sliding amount of the wheel base and the rear seat. However, if the center cross member is simply moved rearward, it interferes with the spare tire storage portion, so that it is necessary to reduce the size of the cross member. In this case, there arises a problem that the rigidity of the vehicle body with respect to bending and twisting is reduced, the strength with respect to the input to the seat belt anchor is reduced, and the spare tire storage space is reduced.

Therefore, for example, in Patent Document 1, the floor panel is divided into a front floor portion and a spare tire storage portion formed by drawing, and formed on the front edge portion of the spare tire storage portion and the front floor portion. In addition, a structure is employed in which a falling wall inclined obliquely downward is joined by spot welding, and a cross member extending in the vehicle width direction is joined to the lower surface of the falling wall. According to this, it is possible to ensure the rigidity of the spare tire storage portion without reducing the spare tire storage space.
JP 2000-280941 A

  By the way, in the above conventional floor structure, the floor panel is divided into a front floor portion and a spare tire storage portion, which has a problem that the number of parts increases, and both are joined by spot welding and the joint is sealed. There is a problem that productivity is lowered and costs are increased.

  The present invention has been made in view of the above-described conventional situation, and provides a vehicle floor structure capable of avoiding a decrease in productivity and an increase in cost of a floor panel while ensuring spare tire storage space and vehicle body rigidity. Is an issue.

  The invention according to claim 1 is a vehicle floor structure in which a spare tire storage portion is integrally recessed at a rear end portion of a floor panel forming a passenger compartment so as to be continuous with at least a front floor portion of the floor panel. The front vertical wall portion of the spare tire storage portion is formed with a stepped portion that is stepped down from the front floor portion, and a substantially L-shaped cross member is formed on the rear side of the stepped portion on the rear side. It is connected so that it may open, and a substantially inverted L-shaped reinforcing member is connected to the upper surface of the step portion so as to open forward.

  The invention of claim 2 is characterized in that, in claim 1, a seat belt member or a seat supporting member for supporting the seat is attached to the upper surface of the reinforcing member.

  According to the automobile floor structure of the present invention, the spare tire storage portion is integrally formed on the floor panel so as to be continuous with the front floor portion, and the front vertical wall portion of the spare tire storage portion is stepped down from the front floor portion. Since the step portion is formed, it is possible to deep-draw the spare tire storage portion without dividing the floor panel. As a result, the number of parts can be reduced as compared with the case of dividing a conventional floor panel, spot welding and sealing can be eliminated, productivity can be improved, and cost can be reduced.

  In the present invention, the cross member is coupled to the lower surface of the step portion so as to open rearward, and the reinforcing member is coupled to the upper surface so as to open frontward. One closed cross section is formed, whereby the strength and rigidity when the spare tire storage portion is formed by deep drawing can be increased. As a result, the wheel base and the seat slide amount can be increased.

  In the invention of claim 2, since the seat belt member or the seat support member is attached to the upper surface of the reinforcing member, the seat belt or the seat can be supported by the reinforcing member having high strength and rigidity.

  Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings.

  1 to 3 are views for explaining a floor structure of an automobile according to an embodiment of the present invention. FIG. 1 is a cross-sectional view of a floor panel in which a spare tire storage portion is formed, and FIG. FIG. 3 is an exploded perspective view, and FIG. 3 is a plan view of the floor panel.

  In the figure, reference numeral 1 denotes a rear floor panel forming a rear compartment, and a rear floor cross member 21 is disposed on the front side of the floor panel 1. The rear floor cross member 21 has a rear occupant footrest portion 21a and a kickup portion 21b that is erected obliquely upward following the footrest portion 21a, and a rear edge of the kickup portion 21b. A front edge portion of the rear floor panel 1 is coupled to the portion.

  Left and right rear side members 2 and 2 having a hat-like cross section that opens upwardly extending in the front-rear direction are coupled to left and right end portions of the lower surface of the rear floor panel 1. Rear wheel houses 3 and 3 are connected to the outside of the left and right rear side members 2.

  A lower back 4 comprising a lower inner panel 4a and a lower outer panel 4b is connected to the rear end of the rear floor panel 1. The lower back 4 forms the lower edge of the back door opening.

  A floor cross member 5 extending in the vehicle width direction is connected between the footrest portion 21a and the kick-up portion 21b of the rear floor cross member 21, and a vehicle is interposed between the kick-up portion 21b and the rear floor panel 1. A floor cross upper member 6 extending in the width direction is connected.

  The rear floor panel 1 has a front floor portion 1e in the front half and a spare tire storage portion 1d in the rear half, and the spare tire storage portion 1d is integrally formed so as to be continuous with the front floor portion 1e. .

  A rear seat 8 is mounted above the front floor portion 1e. The rear seat 8 has a seat cushion 8a and a seat back 8b sized to extend over substantially the entire area of the front floor portion 1e. The rear seat 8 is spaced from the front floor portion 1e by a predetermined distance in the vehicle width direction. It is supported by three seat rails (seat support members) 9 that are arranged open so as to be movable in the front-rear direction. A fuel tank 10 is mounted below the front floor portion 1e.

  The spare tire storage portion 1d is formed by deep drawing, and when the spare tire 11 is stored, the upper edge of the spare tire 11 is lower than the general surface of the front floor portion 1e. It is formed as follows.

  A clamp bracket 12 is connected to the bottom wall 1f of the spare tire storage portion 1d, and the spare tire 11 is detachably fixed to the clamp bracket 12 via a clamp member 13. A tow hook 14 is connected to the lower surface of the spare tire storage portion 1d.

  The spare tire storage portion 1d includes a front vertical wall 1g extending downward following the front floor portion 1e, and left and right vertical walls 1h and 1h extending rearward from the front vertical wall portion 1g so as to extend outward in the vehicle width direction. And a rear vertical wall 1i that connects the rear ends of the left and right vertical walls 1h in the vehicle width direction.

  The rear vertical wall 1i is formed in a flange shape having a depth smaller than that of the front vertical wall 1g, and a lower extension 4a 'of the lower inner 4a of the lower back 4 is connected to the rear vertical wall 1i. ing. A rear wall of the spare tire storage portion 1d is formed by the downward extension portion 4a ′.

  A stepped portion 1j having a step-down shape is formed in the front vertical wall portion 1g of the spare tire storage portion 1d following the rear end portion of the front floor portion 1e.

  A substantially L-shaped cross member 15 is coupled to the lower surface of the stepped portion 1j so as to open rearward, and a substantially inverted L-shaped reinforcing member 16 is coupled to the upper surface so as to open forward. Yes.

  The cross member 15 has a length that extends over substantially the entire length of the rear floor panel 1 in the vehicle width direction, and both ends of the cross member 15 have closed cross-sections on the side walls of the left and right side members 2 and 2. Combined to make. A rear suspension (not shown) is connected to the connecting portions 2a and 2a of the left and right side members 2 with the cross member 15.

  The left and right side portions 15a and 15a of the cross member 15 in the vehicle width direction have a cross-sectional hat shape opening upward, and the front and rear flange portions 15b and 15b of the left and right side portions 15a are formed on the rear floor panel 1. The bottom surface is joined by spot welding so as to form a closed cross section.

  A center portion 15c in the vehicle width direction of the cross member 15 is formed so as to surround a lower surface of the step portion 1j. A front flange portion 15d of the center portion 15c abuts on an upper edge portion of the step portion 1j, and The flange portion 15e is in contact with the lower edge portion of the step portion 1j.

  A tank bracket 18 is connected to the lower surface of the central portion 15 c, and a rear end portion of the fuel tank 10 is attached to the tank bracket 18.

  Seat-rein hoses 20, 20 having a generally hat shape are disposed at the attachment portions of the left and right seat rails 9, 9 in the cross member 15, and the left and right seat-rein hoses 20 are attached to the cross member 15. Are combined.

  The reinforcing member 16 has a length over substantially the entire length in the vehicle width direction of the stepped portion 1j of the spare tire storage portion 1d, and an upper wall portion 16a that is substantially flush with the front floor portion 1e, And a vertical wall portion 16b that is bent downward and extends from the wall portion 16a.

  The front flange portion 16c of the upper wall portion 16a of the reinforcing member 16 is overlapped with the front flange portion 15d together with the upper edge portion of the step portion 1j and joined by spot welding. The rear flange portion 16d of the vertical wall portion 16b is joined to the lower flange portion 15e together with the lower edge portion of the step portion 1j by spot welding. As a result, the upper and lower closed sections a and b are formed at the stepped portion 1j by the reinforcing member 16 and the cross member 15.

  The front end portion 9a of the seat rail 9 'located at the center in the vehicle width direction is fixed to the floor cross upper member 6 via the seat reinforcing member 22, and the rear end portion 9b is seated on the upper wall portion 16a of the reinforcing member 16. It is fixed via a reinforcing member 23 (see FIG. 3).

  The rear end 9b of the central seat rail 9 'is integrally formed with an extension 9c extending rearward from the rear end 9b. The extension portion 9c extends to a position where it wraps on the front end portion 11a of the spare tire 11 above the spare tire storage portion 1d. As a result, the rearward movement position of the rear seat 8 is set rearward by the extension portion 9c. Here, in order to take out the spare tire 11, the spare tire 11 is pulled up by raising the rear end portion thereof, and pulled out rearward from the back door opening of the lower back 4.

  According to the present embodiment, the spare tire storage portion 1d is integrally formed on the rear floor panel 1 so as to be continuous with the front floor portion 1e, and the front vertical wall portion 1g of the spare tire storage portion 1d is provided on the front floor portion 1e. Since the stepped portion 1j having a falling shape is formed, the deep drawing of the spare tire storage portion 1d can be performed without dividing the floor panel. As a result, the number of parts can be reduced as compared with the case of dividing a conventional floor panel, spot welding and sealing can be eliminated, productivity can be improved, and cost can be reduced.

  In the present embodiment, the center portion 15c of the cross member 15 extending over the substantially entire length in the vehicle width direction of the rear floor panel 1 is coupled to the lower surface of the step portion 1j, and the entire length in the vehicle width direction of the front vertical wall portion 1g is coupled to the upper surface. Since the reinforcing member 16 extending over the upper and lower ends is coupled, the upper and lower closed sections a and b are formed at the stepped portion 1j by the cross member 15 and the reinforcing member 16, and the section of the stepped portion 1j is formed. The coefficient can be increased, and the vehicle body rigidity against bending deformation and torsional deformation can be improved.

  Accordingly, even the thin rear floor panel 1 can be deep-drawn while ensuring a necessary section modulus, and the spare tire storage portion 1d is set at a lower depth than the general surface of the floor panel 1. The depth can be.

  In this embodiment, since the seat rail 9 'is fixed to the upper wall portion 16a of the reinforcing member 16, the rear seat 8 can be supported by the reinforcing member 16 having high strength and rigidity so as to be movable in the front-rear direction.

  In the present embodiment, the extension portion 9c of the seat rail 9 'is extended to a position where the extension portion 9c wraps above the spare tire storage portion 1d. The rear seat 8 can be made long slide.

  In this embodiment, since the cross member 15 connected to the left and right side members 2 and 2 is coupled to the step portion 1j of the spare tire storage portion 1d, the strength and rigidity of the spare tire storage portion 1d are ensured. On the other hand, the part arrangement space below the floor panel 1 can be expanded. By supporting the rear suspension on the cross member 15 having high strength and rigidity, it becomes possible to move the arrangement position of the rear wheel backward, and thus the wheel base can be enlarged.

  Further, by supporting the fuel tank 10 on the cross member 15, the fuel capacity of the fuel tank 10 can be increased. Further, by attaching a seat belt anchor (not shown) to the cross member 15, the seat belt It can handle large loads acting on the anchor.

It is sectional drawing of the floor panel in which the spare tire storage part by one Embodiment of this invention was formed. It is a disassembled perspective view of the said floor panel. It is a top view of the said floor panel.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Rear floor panel 1d Spare tire storage part 1e Front floor part 1g Front vertical wall part 1j Step part 8 Rear seat 9 Seat rail (seat support member)
15 Cross member 16 Reinforcing member

Claims (2)

A floor structure of an automobile in which a spare tire storage portion is formed at a rear end portion of a floor panel forming a passenger compartment and is integrally recessed so as to be continuous with at least a front floor portion of the floor panel,
The front vertical wall portion of the spare tire storage portion is formed with a stepped portion that is stepped down from the front floor portion, and a substantially L-shaped cross member opens to the rear side on the lower surface of the stepped portion. An automobile floor structure, wherein a substantially inverted L-shaped reinforcing member is joined to the upper surface of the stepped portion so as to open to the front side. The automobile floor structure according to claim 1, wherein a seat belt member or a seat support member that supports the seat is attached to an upper surface of the reinforcing member.

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