JP2012081877A - Rear body structure of automobile - Google Patents

Abstract

PROBLEM TO BE SOLVED: To set high bending rigidity of a vehicle-body front-back direction of an additional member like a load dispersing member which transmits rear collision load to the front of the vehicle body without increasing the size and thickness of the additional member and to effectively reduce the deformation amount of a vehicle body rear part caused by rear collision and reduce a collision stroke.SOLUTION: This structure has: right and left rear side frames 14 extending in the vehicle-body front-back direction in the right/left both sides of a rear floor panel 10; a spare tire pan cross member 24 which extends in the vehicle-body width direction along the vehicle-body-width-direction cross sectional shape of a spare tire pan part 12 in a vehicle body front part side of the spare pan part 12 formed in the rear floor panel 10, is coupled to the spare tire pan part 12 to form a box-shaped cross sectional shape, and has right/left ends coupled to the right/left rear side frames 14; and a rear center frame 26 which is disposed along a bottom part of the spare tire pan part 12, is linearly extending in the vehicle-body front-back direction at a center part of the vehicle-body width direction, and has a front end abutting and coupled to a rear wall of the spare tire pan cross member 24.

Description

  The present invention relates to a rear body structure of an automobile, and more particularly to a rear body structure having a spare tire pan.

  As a rear body structure of a vehicle having a spare tire pan (spare tire house) for accommodating a spare tire, a load distribution member extending along the vehicle body longitudinal direction so as to crawl the lower bottom surface of the spare tire pan is assembled to the spare tire pan. The front end portion of the load distribution member is coupled to a cross member laid between a pair of left and right rear side members (rear side frames), and the rear end portion of the load distribution member is disposed on the rear end side of the pair of rear side members. There is one coupled to the back panel (for example, Patent Document 1).

  In this rear vehicle body structure, the load distribution member extends between the left and right rear side members in the longitudinal direction of the vehicle body, and the front end is coupled to the cross member. It works to transmit (impact load) to the cross member.

JP 2006-88740 A

  However, in the rear vehicle body structure as shown in Patent Document 1, the load distribution member is arranged so as to crawl the lower bottom surface of the spare tire pan, so that the bent portion is formed along the side cross-sectional shape of the spare tire pan. Since it includes a shape, a bending moment is generated in the transmission of the rear impact load to the cross member, and it is difficult to set the bending rigidity in the longitudinal direction of the vehicle body high without increasing the size and thickness.

  The problem to be solved by the present invention is to increase the bending rigidity in the vehicle longitudinal direction of an additional member such as a load distribution member that transmits a rear impact load to the front of the vehicle body without increasing the size and thickness of the additional member. In other words, the amount of deformation of the rear part of the vehicle body due to a rear collision (especially an offset rear collision) and the shortening of the collision stroke can be effectively performed.

  The rear body structure of a vehicle according to the present invention is a rear body structure of a vehicle having a spare tire pan portion 12 having a recessed shape for accommodating a spare tire (ST) at a rear portion of the rear floor panel (10), Left and right rear side frames (14) extending in the longitudinal direction of the vehicle body on the left and right sides of the rear floor panel (10), and the vehicle body width of the spare tire pan portion (12) on the vehicle body front side of the spare tire pan portion (12) It extends in the vehicle body width direction following the cross-sectional shape in the direction, is coupled to the spare tire pan portion (12) to form a box-shaped cross-sectional shape, and the left and right end portions are coupled to the left and right rear side frames (14). The spare tire pan cross member (24) and the spare tire pan cross section (12) are arranged along the bottom of the spare tire pan cross section (12) and extend in a straight line in the longitudinal direction of the vehicle body in the vehicle width direction. The front end and a abuts against the wall combined rear center frame (26) after the spare tire pan cross member (24).

  According to this rear vehicle body structure, the rear center frame (26) is disposed along the bottom of the spare tire pan portion (12), and extends in a straight line in the vehicle longitudinal direction from the center in the vehicle width direction. Since it is abutted and joined to the rear wall of the spare tire pan-cross member (24), the transmission of the rear-impact load to the spare tire pan-cross member (24) does not cause a bending moment, The bending rigidity in the longitudinal direction of the vehicle body of the rear center frame (26), which is an additional member, can be set high without causing the rear center frame (26) to be large and thick.

  In the rear vehicle body structure according to the present invention, preferably, the rear center frame (26) has a concave cross-sectional shape having flange pieces on both sides in the vehicle width direction, and the flange pieces are used as the spare parts. It is combined with the bottom of the tire pan (12) to form a box-shaped cross section.

  According to this rear vehicle body structure, the spare tire pan portion (12) and the rear center frame (26) form a box-shaped cross-sectional shape, whereby the bending rigidity of the rear center frame (26) in the longitudinal direction of the vehicle body is increased. The frame (26) can be set higher without causing an increase in size and thickness.

  The rear body structure of the automobile according to the present invention preferably further includes a front wall facing the rear wall of the spare tire pan-cross member (24) inside the concave portion of the rear center frame (26). A stiffener (36, 38) having a concave cross-sectional shape is coupled.

  According to this rear vehicle body structure, the bending rigidity of the rear center frame (26) in the longitudinal direction of the vehicle body is further increased by the installation of the stiffeners (36, 38), and the stiffeners (36, 38) serve as spare tire pan cross members (24). By having the front wall opposite to the rear wall, the collision load is transmitted from the rear center frame (26) to the spare tire pan cross member (24) via the stiffeners (36, 38). .

  The rear vehicle body structure of the vehicle according to the present invention is preferably connected to the rear wall of the spare tire pan cross member (24) and the bottom of the concave portion of the rear center frame (26), and the spare tire pan cross member (24) has a box-shaped cross-sectional shape, and further includes a collision load transmission member (34) having a rear wall directly opposed to the front wall of the stiffener (36, 38).

  According to this rear vehicle body structure, the collision strength transmission member (34) reinforces the coupling strength of the rear center frame (26) to the rear wall of the spare tire pan-cross member (24), and the spare tire from the rear center frame (26). The transmission of the collision load to the pan cross member (24) can be performed even better.

  In the rear vehicle body structure of the vehicle according to the present invention, preferably, the rear center frame (26) is divided into a front rear center frame (30) and a rear rear center frame (32), and the front rear center frame ( 30) is abutted and coupled to the rear wall of the spare tire pan cross member (24), and the collision load transmission member (34) is coupled to the front rear center frame (30), so that the rear rear center frame (32) is coupled. ) To which the stiffeners (36, 38) are coupled.

  According to this rear vehicle body structure, after the front rear center frame (30) and the collision load transmission member (34) are coupled to the rear wall of the spare tire pan cross member (24), the rear rear center frame (32) Combine work can be performed.

  In the rear body structure of the automobile according to the present invention, preferably, the stiffener is divided into a front stiffener (36) and a rear stiffener (38), and the front stiffener (36) and the rear stiffener (38) A folded portion (A) of the rear center frame (26) is formed therebetween. Further, a tire fastening portion (44) for fastening the center portion (B) of the tire (ST) to the bottom portion of the spare tire pan portion (12) is provided at a position ahead of the vehicle body from the bent portion (A). Yes.

  According to this rear vehicle body structure, the gap between the front stiffener (36) and the rear stiffener (38) becomes weaker than the other portions, and the folded portion (A) of the rear center frame (26) is clearly formed, When the rear center frame (26) is bent at the bent portion (A) at the time of a severe rear impact, the rear impact energy is reliably absorbed at the design location without causing deformation of the vehicle interior space.

  The rear vehicle body structure of the automobile according to the present invention preferably includes a rear cross member (46) extending in a vehicle body width direction from the spare tire pan portion (12) of the rear floor panel (10), and the rear A front wall reinforcing member (56) extending in the vehicle longitudinal direction along the front wall of the spare tire pan portion (12) is further provided between the cross member (46) and the spare tire pan cross member (24). .

  According to this rear vehicle body structure, the front wall of the pair tire pan portion (12) is efficiently reinforced by the front wall reinforcing member (56).

  In the rear vehicle body structure according to the present invention, the spare tire pan cross member (24) is preferably provided with a rear suspension arm mounting portion (24C).

  According to the rear vehicle body structure, the pair tire pan cross member (24) is effectively used as the mounting portion (24C) of the rear suspension arm, and the support strength of the rear suspension arm is increased.

  According to the rear structure of the vehicle body according to the present invention, the rear center frame is disposed along the bottom of the spare tire pan portion, the central portion in the vehicle body width direction extends straight in the vehicle longitudinal direction, and the front end is the spare tire. Since it is abutted and joined to the rear wall of the pan-cross member, there is no bending moment in the transmission of the rear-impact load to the spare tire pan-cross member, and the rear center frame is an additional member for load distribution. The bending rigidity in the longitudinal direction of the vehicle body can be set high without causing an increase in the size and thickness of the rear center frame, and the amount of deformation of the rear portion of the vehicle body due to a rear collision can be effectively reduced and the collision stroke can be shortened effectively. By providing the rear center frame, the rear impact load is distributed by the three frames of the left and right rear side frames and the rear center frame and transmitted to the front of the vehicle body. A rear impact load is distributed and transmitted to the front of the vehicle body by the two frames of the rear center frame, and deformation of the rear portion of the vehicle body is effectively suppressed.

The bottom bottom view (plan view which looked at the rear floor pal from the vehicle outside) which shows one example of the body rear part structure of the car by the present invention. The bottom bottom view of the principal part of the vehicle body rear part structure of the automobile according to the present embodiment. The perspective view which looked through the rear floor pal from the vehicle interior side of the vehicle body rear part structure of the automobile according to the present embodiment. The side view of the principal part of the vehicle body rear part structure of the motor vehicle by a present Example. The bottom bottom view of the principal part of the vehicle body rear part structure of the automobile according to the present embodiment. The detailed perspective view which looked at the principal part of the vehicle body rear part structure of the car by this example from the vehicle interior side (the perspective view in the state where the rear floor pal was removed). The detailed perspective view which looked at the principal part of the vehicle body rear part structure of the car by this example from the vehicle compartment outside (the perspective view in the state where the rear floor pal was removed). FIG. 3 is a plan sectional view showing details of a rear center frame of the rear body structure of the automobile according to the present embodiment and a connecting portion between the rear center frame and the pair tire pan cross member.

  Hereinafter, one embodiment of a vehicle body rear structure according to the present invention will be described with reference to FIGS. The members constituting the rear structure of the vehicle body are obtained by pressing a steel plate unless otherwise specified. In the following description, front and rear refer to the front and rear of the vehicle body, and left and right refer to the left and right in the width direction of the vehicle body.

  As shown in FIGS. 1 to 5, the rear structure of the vehicle body includes a rear floor panel 10 as a floor member that constitutes a floor behind the vehicle body from the rear seat. A rear part of the rear floor panel 10 is formed with a spare tire pan 12 having a recessed shape for accommodating the spare tire ST (see FIG. 4). The spare tire pan portion 12 has a bottom portion 10B below the general surface 10A of the rear floor panel 10, a front wall 10C that rises from the bottom portion 10B and is connected to the general surface 10A, and left and right side walls 10D, and is open rearward. It has a shallow bathtub shape.

  Left and right rear side frames 14 extending in parallel with each other in the longitudinal direction of the vehicle body are provided on the left and right sides of the rear floor panel 10. The left and right rear side frames 14 each have a concave cross-sectional shape of an upper opening having flange pieces 14A on both left and right sides, so-called hat-shaped cross-sectional shapes, and the flange pieces 14A are generally attached to the left and right sides of the rear floor panel 10. By being joined to the lower bottom surface (surface outside the passenger compartment) of the surface 10A by spot welding, a box-shaped cross-sectional shape (closed cross-sectional shape) is configured in cooperation with the rear floor panel 10.

  End portions of the left and right rear side frames 14 on the front side of the vehicle body are coupled to the rear end portions of the left and right side sills 16 extending in parallel with each other in the longitudinal direction of the vehicle body by spot welding (see FIG. 1). Left and right bumper extension members 18 having a box-shaped cross-section are coupled to the rear end portions of the left and right rear side frames 14 (see FIG. 1). A rear bumper frame 20 is coupled to the left and right bumper extension members 18 by spot welding so as to bridge the two (see FIG. 1).

  A first rear floor cross member 22 that extends in the vehicle body width direction and that has left and right ends joined to the front ends of the left and right rear side frames 14 by spot welding is provided at an edge of the rear floor panel 10 on the vehicle body front side. Yes. The first rear floor cross member 22 has a concave transverse cross-sectional shape (hat-shaped cross-sectional shape) having a lower opening having flange pieces 22A on both front and rear sides, and the flange piece 22A is connected to the front edge of the rear floor panel 10. By connecting to the upper surface (surface on the vehicle interior side) by spot welding, a box-shaped cross-sectional shape (closed cross-sectional shape) is configured in cooperation with the rear floor panel 10.

  The spare tire pan 12 has a vehicle front side that extends in the vehicle width direction following the cross-sectional shape of the spare tire pan 12 in the vehicle width direction, and the left and right end portions are spot welded to the left and right rear side frames 14. A joined spare tire pan cross member 24 is provided. The spare tire pan cross member 24 has a concave transverse cross-sectional shape (hat-shaped cross-sectional shape) having an upper opening having flange pieces 24A on both front and rear sides, and a bottom portion 10B of the spare tire pan portion 12 and left and right side walls 10D. The flange piece 24A is coupled over the entire area of the bottom 10B of the spare tire pan 12 and the left and right side walls 10D so as to cooperate with the rear floor panel 10 so A cross-sectional shape (closed cross-sectional shape) is formed.

  On the left and right sides of the spare tire pan cross member 24, there are provided rear suspension arm mounting portions 24C (see FIGS. 5 and 6) not shown.

  The center portion of the bottom portion 10B of the spare tire pan portion 12 in the vehicle width direction extends straight along the vehicle body longitudinal direction without including a large bent portion along the bottom portion 10B, and the front end of the spare tire pan cross member 24 A rear center frame 26 that is abutted and coupled to the rear wall 24B is provided.

  Details of the rear center frame 26 will be described with reference to FIGS. The rear center frame 26 is divided into a relatively short front rear center frame 30 and a relatively long rear rear center frame 32. The front rear center frame 30 and the relatively long rear rear center frame 32 each have a concave cross-sectional shape (hat-shaped cross-sectional shape) with an upper opening having flange pieces 30A and 32A on both the left and right sides. In addition, the front end of the front rear center frame 30 and the rear end of the rear rear center frame 32 are connected to each other in a partially overlapping manner to form a straight line so that the outer side of the bottom 10B of the spare tire pan 12 is covered with the vehicle interior. A box-shaped cross-sectional shape (closed cross-sectional shape) is provided in cooperation with the rear floor panel 10 by connecting the flange pieces 30A, 32A to the bottom 10B of the spare tire pan 12 by spot welding. It is composed.

  Flange pieces 30 </ b> B are bent at both the left and right sides of the front end of the front rear center frame 30. The flange piece 30B is joined to the rear wall 24B of the spare tire pan cross member 24 by spot welding. Accordingly, the front rear center frame 30 is abutted and coupled to the rear wall 24B of the spare tire pan cross member 24.

  On the rear wall 24B side of the spare tire pan cross member 24, a collision load transmission member 34 is provided. The collision load transmitting member 34 has a concave transverse cross-sectional shape (hat-shaped cross-sectional shape) with a front opening having flange pieces 34 </ b> A on both the left and right sides, and is located behind the rear wall 24 </ b> B of the spare tire pan-cross member 24. It has a rear wall 34B located. The rear wall 34B of the collision load transmission member 34 is a wall portion parallel to the rear wall 24B of the spare tire pan cross member 24.

  A flange piece 34C is bent at the left and right sides of the collision load transmitting member 34 and the lower edge of the rear wall 24B. The collision load transmission member 34 has a flange piece 34A coupled to the rear wall 24B of the spare tire pan cross member 24 by spot welding, and the flange piece 34C is spot welded to the bottom 30C of the concave portion of the front rear center frame 30. And form a box-shaped cross-sectional shape in cooperation with the spare tire pan cross member 24.

  Inside the concave portion of the rear rear center frame 32, a front stiffener 36 and a rear stiffener 38 having a concave cross-sectional shape with an upper opening are joined by spot welding. The front stiffener 36 and the rear stiffener 38 are disposed in the rear rear center frame 32 with a gap 40 in the vehicle longitudinal direction.

  The portion where the rear rear center frame 32 corresponds to the gap 40 is more fragile than the portion where the front stiffener 36 and the rear stiffener 38 are provided, and the portion corresponding to the gap 40 is the bent portion A (see FIG. 4 and FIG. 8). In the present embodiment, the bent portion A is located at a loosely bent portion 10E of the bottom portion 10B of the spare tire pan portion 12 that is V-shaped and opened with a large obtuse angle. As a result, the rear rear center frame 32 is more easily bent at the bent portion A.

  The front portion of the front stiffener 36 projects forward from the front end of the rear rear center frame 32 and enters the inside of the concave portion of the front rear center frame 30. The front stiffener 36 has a front wall 36A that stands up from the bottom at the front end. The front wall 36A faces the rear wall 24B of the spare tire pan cross member 24 and the rear wall 34B of the collision load transmission member 34 in parallel. In this embodiment, the front wall 36A of the front stiffener 36 and the rear wall 34B of the collision load transmission member 34 are opposed to each other with a small gap 35 in the longitudinal direction of the vehicle body.

  The front wall 36A of the front stiffener 36 is joined to the bent front end portions of the left and right side walls 36B of the front stiffener 36 by spot welding, and forms a box shape in cooperation with the left and right side walls 36B, thereby achieving high rigidity. It has been.

  A standing piece 32 </ b> B is bent at the rear end of the rear rear center frame 32. At the rear of the rear rear center frame 32, a tow hook member 42 having one end coupled to the standing piece 32B and the other end coupled to the bottom near the rear end 32C of the rear rear center frame 32 is attached.

  As shown in FIG. 3, the spare tire pan 12 has a central portion B (see FIG. 3) at a position in front of the vehicle body from the fold A set by the gap 40. 4) is connected to the bottom portion 10B of the spare tire pan portion 12 by a spot welding.

  As shown in FIGS. 1 to 3, spot welding is performed on the left and right rear side frames 14 extending from the spare tire pan portion 12 of the rear floor panel 10 to the front portion of the vehicle body in the vehicle body width direction. A second rear floor cross member 46 is provided which is joined together by.

  In this embodiment, a fuel tank, a fuel pump (not shown), and the like are arranged outside the vehicle compartment on the front side of the vehicle body from the spare tire pan portion 12 of the rear floor panel 10, so that the spare tire pan portion 12 of the rear floor panel 10. Further, a maintenance hole 10F for the fuel pump is formed in the front part of the vehicle body. The second rear floor cross member 46 is disposed so as to cross the maintenance hole 10F in the vehicle body width direction, so that a concave cross-sectional shape of a downward opening having a flange piece portion 48A, 50A on both front and rear sides (hat) The flange pieces 48A and 50A are joined to the upper surface of the rear floor panel 10 (the surface on the vehicle interior side) by spot welding and cooperate with the rear floor panel 10 to form a box-shaped cross section (closed cross section). Shape) and left and right side members 48 and 50, and left and right end portions are detachably connected to side members 48 and 50 by bolts 52, and are divided into a central member 54 located at the maintenance hole 10F. Has been.

  On the vehicle exterior side of the front wall 10C of the spare tire pan portion 12, a space between the second rear floor cross member 46 and the spare tire pan cross member 24 extends along the front wall 10C of the spare tire pan portion 12 in the longitudinal direction of the vehicle body. An extending front wall reinforcing member 56 is provided. The front wall reinforcing member 56 is joined to the front wall 10C of the spare tire pan 12 by spot welding, and the upper front end is made up of the flange pieces 48A, 50A of the side members 48, 50 and the rear floor panel 10. The bottom rear end is spot-welded in a triple manner by the flange piece 24A of the spare tire pan cross member 24 and the rear floor panel 10.

  According to the vehicle body rear structure according to the above-described embodiment, the rear center frame 26 is arranged along the bottom portion 10B of the spare tire pan portion 12, and the central portion in the vehicle body width direction does not include a large bent portion in the vehicle body front-rear direction. Since it extends in a straight line and the front end is abutted and joined to the rear wall 24B of the spare tire pan-cross member 24, the bending rigidity in the longitudinal direction of the vehicle body of the rear center frame 26, which is an additional member for load distribution, The rear center frame 26 can be set high without causing an increase in size and thickness, and the amount of deformation of the rear part of the vehicle body due to a rear collision is effectively reduced and the collision stroke is shortened.

  Since the rear center frame 26 is provided, the rear impact load is distributed by the three frames of the left and right rear side frames 14 and the rear center frame 26 and transmitted to the front of the vehicle body. The rear impact load is distributed and transmitted to the front of the vehicle body by the two frames of the rear side frame 14 and the rear center frame 26, and deformation of the rear portion of the vehicle body is effectively suppressed.

  Furthermore, the bottom 10B of the spare tire pan 12 and the rear center frame 26 form a box-shaped cross-sectional shape, so that the bending rigidity of the rear center frame 26 in the longitudinal direction of the vehicle body can be increased. It can be set higher without causing thickening.

  Furthermore, since the front stiffener 36 and the rear stiffener 38 are installed, the bending rigidity of the rear center frame 26 in the longitudinal direction of the vehicle body is further increased. Further, since the front stiffener 36 has a front wall facing the rear wall 24B of the spare tire pan cross member 24, transmission of a collision load from the rear center frame 26 to the spare tire pan cross member 24 is performed at the front portion. This is also performed via the stiffener 36.

  Further, the provision of the collision load transmission member 34 reinforces the coupling strength of the front rear center frame 30 to the rear wall 24B of the spare tire pan cross member 24, and the spare tire pan cross member from the rear center frame 26. Transmission of the collision load to 24 can be performed even better. The collision load transmission member 34 may be configured in a box shape with its upper end closed in order to improve rigidity.

  In this embodiment, the front rear center frame 30 is abutted and coupled to the rear wall 24B of the spare tire pan cross member 24, and the collision load transmission member 34 is coupled to the front rear center frame 30, and the rear rear center frame 32 is coupled. Since the front stiffener 36 and the rear stiffener 38 are coupled to each other, the load transmission efficiency of the rear center frame 26 is improved. Further, after the front rear center frame 30 and the collision load transmission member 34 are coupled to the rear wall 24B of the spare tire pan cross member 24, the rear rear center frame 32 can be coupled.

  Since the gap 40 is provided between the front stiffener 36 and the rear stiffener 38, the gap 40 becomes weaker than the other parts, and the folded portion A of the rear center frame 26 is clearly formed. At the time of rear collision, the rear center frame 26 is reliably bent at the bent portion A. As a result, the rear-end collision energy is reliably absorbed at the design location without causing deformation of the vehicle interior space.

  Further, since the front wall reinforcing member 56 is provided, the front wall 10A of the pair tire pan portion 12 is reinforced, and the behavior that the pair tire ST is lifted upward against the front wall 10A of the pair tire pan portion 12 is more reliable. become.

  Since the spare tire pan cross member 24 is provided with the rear suspension arm mounting portion 24C, the pair tire pan cross member 24 is effectively used as the rear suspension arm mounting portion 24C, and the support strength of the rear suspension arm is high. Become.

  The rear center frame 26 also functions as a reinforcing member for the attachment portion of the traction hook member 42 by attaching the traction hook member 42 to the rear end portion of the rear rear center frame 32.

DESCRIPTION OF SYMBOLS 10 Rear floor panel 12 Spare tire pan part 14 Rear side frame 16 Side sill 18 Bumper extension member 20 Rear bumper frame 22 First rear floor cross member 24 Spare tire pan cross member 24B Rear wall 24C Rear suspension arm attachment part 26 Rear center frame 30 Front part Rear center frame 32 Rear rear center frame 34 Collision load transmission member 34B Rear wall 36 Front stiffener 36A Front wall 38 Rear stiffener 42 Pulling hook member 44 Tire fastening member 46 Second rear floor cross member 56 Front wall reinforcing member A Folding portion

Claims (9)

A rear body structure of a vehicle having a spare tire pan portion in a recessed shape for accommodating a spare tire at a rear portion of a rear floor panel,
Left and right rear side frames extending in the vehicle longitudinal direction on both left and right sides of the rear floor panel;
The vehicle front side of the spare tire pan portion extends in the vehicle width direction following the cross-sectional shape in the vehicle width direction of the spare tire pan portion, and is connected to the spare tire pan portion to form a box-shaped cross-sectional shape, Spare tire pancross members having left and right ends coupled to the left and right rear side frames,
A rear center that is arranged along the bottom of the spare tire pan portion, extends in a straight line in the vehicle body longitudinal direction in the vehicle body width direction, and has a front end abutting and coupled to a rear wall of the spare tire pan cross member Frame,
A rear body structure of an automobile having   The rear center frame has a concave cross-sectional shape having flange pieces on both sides in the vehicle width direction, and the flange piece is coupled to the bottom of the spare tire pan portion to form a box-shaped cross-section. The rear body structure of an automobile according to claim 1.   The stiffener having a concave cross-sectional shape having a front wall facing a rear wall of the spare tire pan cross member is coupled to an inner side of the concave portion of the rear center frame. Car body rear structure.   The spare tire pan-cross member is coupled to the rear wall of the rear center frame and the bottom of the concave portion of the rear center frame to form a box-shaped cross-section with the spare tire pan-cross member, and directly opposite the front wall of the stiffener The vehicle body rear part structure according to claim 3, further comprising a collision load transmission member provided with a wall.   The rear center frame is divided into a front rear center frame and a rear rear center frame, and the front rear center frame is abutted and coupled to a rear wall of the spare tire pan-cross member, and the front rear center frame The vehicle body rear structure according to claim 4, wherein the collision load transmission member is coupled to the rear rear center frame and the stiffener is coupled to the rear rear center frame.   The stiffener is divided into a front stiffener and a rear stiffener, and a bent portion of the rear center frame is formed between the front stiffener and the rear stiffener. Car body rear structure.   The vehicle body rear part structure according to claim 6, wherein a tire fastening portion for fastening a center portion of a tire tire to a bottom portion of the spare tire pan portion is provided at a position in front of the vehicle body from the folding portion. A rear cross member extending in the vehicle body width direction from the spare tire pan portion of the rear floor panel in the vehicle body width direction;
A front wall reinforcing member extending in the vehicle longitudinal direction along the front wall of the spare tire pan portion between the rear cross member and the spare tire pan cross member;
The vehicle body rear structure according to any one of claims 1 to 7, further comprising:   The rear body structure of an automobile according to any one of claims 1 to 8, wherein a mounting portion for a rear suspension arm is provided on the spare tire pan cross member.

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