JP2007038717A - Lower body structure of automobile - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a lower body structure of an automobile capable of exhibiting an appropriate shock absorption at the lower side of a floor panel in case of rear-end collision while a spare tire and an exhaust silencer are efficiently disposed in the lower body structure of the automobile mounting the spare tire and the exhaust silencer at the lower side of the floor panel. <P>SOLUTION: A lateral member 10 supporting the left side of the spare tire is provided in this type of structure. The lateral member 10 is installed between a longitudinal member 9 and a left hand side rear side frame 1B, and both members are connected. The lateral member 10 is formed into a hat shape in the same way as the other member or the like, and a rear floor panel 4 and a closed section are constituted by being connected to the rear floor panel 4. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an automobile lower body structure in which an exhaust silencer and a spare tire are attached below a floor panel at the rear of the automobile, and more particularly, an automobile lower body structure in which an exhaust silencer and a spare tire are efficiently arranged to increase vehicle body rigidity. About.

  Conventionally, it is known that an exhaust silencer extending in the vehicle front-rear direction and a spare tire used in an emergency are attached below the floor panel at the rear of the automobile. At this time, if the spare tire is directly supported by the floor panel, stable support rigidity cannot be obtained. Therefore, the spare tire is usually attached via a member member.

  By the way, although various member members are disposed below the floor panel, in Patent Document 1 below, a first cross member positioned behind the rear seat and a distance from the first cross member to the vehicle rear side. The second cross member arranged with a gap between the first cross member and the vertical member is connected to a vertical member extending in the vehicle front-rear direction at the center of the vehicle. The one which attaches a seat belt anchor is disclosed.

  According to the structure of this Patent Document 1, since the first and second cross members separated in the longitudinal direction of the vehicle are connected by the vertical members, the rear impact performance of the vehicle can be improved, and the rear seat, The seat belt mounting rigidity can also be improved.

Japanese Utility Model Publication No. 5-37661

  On the other hand, as described above, when a spare tire is attached below the floor panel, the spare tire is heavy, so it is desired to attach it at the center of the vehicle as much as possible so as not to affect the operability of the vehicle. There is a request.

  However, at this time, an exhaust silencer that extends in the vehicle front-rear direction must also be disposed between the pair of left and right rear side frames, so the attachment position of the spare tire is inevitably offset to the left or right from the center in the vehicle width direction. I do not get.

  For this reason, when the member member that supports the spare tire is configured by a member member that extends in the vehicle front-rear direction, the member member must be arranged offset to either the left or right side, and the skeleton below the floor panel There is a problem that the rigidity balance of the part (frame part) collapses on the left and right.

  Thus, if the right and left stiffness balance is lost, there is a possibility that appropriate shock absorption cannot be exhibited below the floor panel at the time of rear-end collision of the vehicle.

  Therefore, the present invention provides a lower body structure of an automobile in which a spare tire and an exhaust silencer are attached below the floor panel, while the spare tire and the exhaust silencer are efficiently arranged, and an appropriate shock is applied below the floor panel at the time of rear-end collision of the vehicle. An object of the present invention is to provide a lower body structure of an automobile that can exhibit absorption.

  The lower body structure of an automobile of the present invention is a lower body structure of an automobile in which a spare tire and an exhaust silencer are attached between a pair of left and right rear side frames below a rear floor panel at the rear of the vehicle. A rear cross member extending in the vehicle width direction at a rear portion and a front cross member extending in the vehicle width direction with a space from the rear cross member to the vehicle front side, and joining the exhaust silencer to one rear side frame A vertical member that supports the spare tire on the other rear side frame side is offset from the vehicle center to one rear side frame side to connect the front cross member and the rear cross member. Extend in the vehicle longitudinal direction so that the other rear side The over arm side, is obtained by installing a reinforcing member for supporting the spare tire.

  According to the above configuration, the exhaust silencer is arranged on one rear side frame side, the spare tire is arranged on the other rear side frame side, and the vertical member supporting the spare tire is installed offset to the one rear side frame side. Also, the reinforcing member is installed on the other rear side frame side.

  For this reason, even if the vertical member is offset, since the reinforcing member is present, it is possible to prevent the rigidity balance of the frame portion below the floor panel from being broken left and right.

  The attachment of the spare tire here may be performed by a hanging mechanism or an arm-type link mechanism, and is not particularly limited.

  In one embodiment of the present invention, the reinforcing member is a horizontal member that extends in the vehicle width direction and connects the vertical member and the other rear side frame.

  According to the above configuration, since the reinforcing member is a horizontal member that connects the vertical member and the other rear side frame, a frame region surrounded by the vertical member, the rear cross member, and the horizontal member can be configured.

  For this reason, a spare tire can be stably supported in the area surrounded by each member.

  Therefore, the spare tire can be reliably and stably supported in the highly rigid region below the floor panel, and play of the spare tire during traveling of the vehicle can be suppressed.

  In an embodiment of the present invention, the reinforcing member is a second vertical member that extends in the vehicle front-rear direction and connects the front cross member and the rear cross member.

  According to the above configuration, since the reinforcing member is the second vertical member extending in the vehicle front-rear direction, the longitudinal member can be increased in rigidity in the vehicle front-rear direction by using two vertical members, and the vehicle body rigidity against the rear collision can be improved. Can do.

  Therefore, the spare tire can be stably supported below the floor panel, and the vehicle body rigidity at the time of rear collision can be improved.

  In one embodiment of the present invention, the height positions of the spare tire and the exhaust silencer are set to overlap in a side view.

  According to the said structure, a spare tire and an exhaust silencer will be arrange | positioned in the state which made the height position substantially correspond in the lower part of a floor panel.

  For this reason, the space occupied in the height direction of the spare tire and the exhaust silencer below the floor panel can be made compact without increasing.

  Therefore, while ensuring a large so-called departure angle of the vehicle, the spare tire and the exhaust silencer can be attached, and the running performance of the vehicle can be improved.

  In one embodiment of the present invention, the spare tire is attached by a hanging device using a linear member, and at least a rear floor panel surrounded by the vertical member and the rear cross member is attached to the hanging tire device. Spare tire suspension point is set.

  According to the above configuration, the spare tire is lifted at the position of the rear floor panel surrounded by the vertical member and the rear cross member.

  For this reason, it is possible to reliably support the spare tire in the highly rigid rear floor panel region surrounded by the members.

  Therefore, the mounting rigidity of the spare tire is increased, and rattling of the spare tire during traveling of the vehicle can be more reliably suppressed.

  According to the present invention, the exhaust silencer is arranged on one rear side frame side, the spare tire is arranged on the other rear side frame side, and the vertical member supporting the spare tire is installed offset to the one rear side frame side. Also, the reinforcing member is installed on the other rear side frame side.

  For this reason, even if the vertical member is offset, since the reinforcing member is present, it is possible to prevent the rigidity balance of the frame portion below the floor panel from being broken left and right.

  Therefore, in the lower body structure of an automobile in which a spare tire and an exhaust silencer are attached below the floor panel, the spare tire and the exhaust silencer are efficiently arranged, but at the time of a vehicle rear-end collision, appropriate shock absorption is exhibited below the floor panel. be able to.

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.
(First embodiment)
First, the first embodiment will be described with reference to FIGS. FIG. 1 is a perspective view from below of a rear part of an automobile in which the lower body structure of the automobile of the present invention is adopted, FIG. 2 is a bottom view of the rear part of the automobile, FIG. 3 is a schematic sectional view of the rear part of the automobile, and FIG. FIG. 5 is a cross-sectional view taken along line AA, FIG. 5 is an explanatory cross-sectional view of a hanging mechanism for lifting a spare tire, and FIG. 6 is a schematic bottom view for explaining the behavior of the vehicle body at the time of a vehicle rear-end collision.

  As shown in FIG. 1 and FIG. 2, the lower vehicle body structure in the rear part of the present embodiment includes a pair of left and right rear side frames 1, 1 that extend in the vehicle front-rear direction at both ends in the vehicle width direction, and an intermediate portion between the rear side frames 1. A front cross member 2 that extends in the vehicle width direction and connects the left and right rear side frames 1 and 1, and a rear side that similarly extends in the vehicle width direction at the rear end of the rear side frame 1 and connects the left and right rear side frames 1 and 1 A cross member 3 is provided, and these side frames 1, 1 and cross members 2, 3 constitute a basic frame at the rear of the vehicle.

  The frames 1 and 1 and the members 2 and 3 constituting the basic frame are formed in a cross-sectional hat shape, and are joined to the rear floor panel 4 that is horizontally stretched on the upper side. Each constitutes a closed cross section (specific illustration is not performed).

  A bumper rain BR extending in the vehicle width direction is connected to the rear ends of the rear side frames 1 and 1 via a crash can 1a.

  Between the left and right rear side frames 1, 1, a fuel tank 5 that is long in the vehicle width direction is installed in front of the front cross member 2, and an exhaust silencer 6 and a spare tire 7 are installed in the rear. Among these, the exhaust silencer 6 communicates with the exhaust pipe 8 extending from the front side of the vehicle, and is disposed so as to extend in the vehicle front-rear direction near the side of the right rear side frame 1A.

  The above-described spare tire 7 is located at a position offset to the left side (upper side in FIG. 2) from the virtual center line L in the center in the vehicle width direction because the exhaust silencer 6 is disposed near the side of the right rear side frame 1A. Is arranged. Specifically, the attachment point P (hanging point) of the spare tire 7 is located on the left side of the virtual center line L and is arranged at a position offset to the left rear side frame 1B side.

  In order to stably support the spare tire 7, a single vertical member 9 extending between the front cross member 2 and the rear cross member 3 in the vehicle front-rear direction and connecting the cross members 2 and 3 is provided. It is installed. Like the other frames and members, the vertical member 9 is also formed in a cross-sectional hat shape and joined to the rear floor panel 4 to form a closed cross section.

  Since the attachment point P of the spare tire 7 is set to be offset from the virtual center line L at the center in the vehicle width direction to the left, the vertical member 9 is also arranged slightly offset from the center to the right.

  That is, in order to set the contact support points of the spare tire 7 evenly at four points (about 90 degrees each), it is conceivable to install vertical members or the like with a predetermined interval left and right. The vertical member 9 that supports the right side of the spare tire 7 is installed close to the vehicle center side by the amount set by offsetting the attachment point P to the left side.

  In the present embodiment, a lateral member 10 that supports the left side of the spare tire 7 is provided. The horizontal member 10 is installed between the vertical member 9 and the left rear side frame 1B, and is configured to connect the two. The horizontal member 10 is also formed in a cross-sectional hat shape like the other members and is joined to the rear floor panel 4 to form a closed cross section with the rear floor panel 4.

  By providing this lateral member 10, the spare tire 7 is also stably supported on the left side of the tire, and as shown in FIG. The member member is surely and firmly supported.

  As shown in FIG. 3, the spare tire 7 and the exhaust silencer 6 are attached below the rear floor panel 4 in a height positional relationship that overlaps in a side view. For this reason, the occupied space in the height direction below the rear floor panel 4 can be configured compactly, and the spare tire 7 and the like do not protrude greatly downward below the rear floor panel 4.

  Therefore, a large so-called departure angle α formed by the road D and the line D connecting the vehicle rear end E and the grounding point R1 of the rear wheel R can be ensured, and the rough road running performance of the vehicle can be improved. .

  In FIG. 3, S is a rear seat installed on the front side of the rear floor panel 4, C is a cabin partitioned by a roof panel 11 on the upper side and a cabin floor panel 12 on the lower side, and T is an upper and lower side at the rear end of the vehicle. This is a luggage compartment partitioned by a trunk lid 13 that opens and closes in the direction, the rear floor panel 4, and a seat back Sa of the rear seat S.

  The spare tire 7 described above is lifted by a tire suspension mechanism 20. As shown in FIG. 2, the tire suspension mechanism 20 includes a tire lifting portion 21 and a wire winding portion 22, and is configured by connecting both with a wire guide pipe 23.

  Specifically, as shown in FIG. 4, the tire suspension mechanism 20 includes a bracket 24 having a U-shaped cross section that is joined to the center of the rear floor panel 4 between the lateral member 10 and the rear cross member 3 in the vehicle front-rear direction. The wire guide pipe 23 penetrating the side wall of the bracket 24 is welded to the bracket 24.

  One end opening 23a of the wire guide pipe 23 opens downward, and the other end 23b of the wire guide pipe 23 extends to the left end of the rear cross member 3 in the vehicle width direction. The side cross member 3 is connected to a wire winding portion 22 fixed to the left end portion in the vehicle width direction (see FIG. 2).

  The wire winding unit 22 has an operation rod 25 protruding upward (see FIG. 3), and the wire 26 can be wound or released by rotating the operation rod 25 with the rotary operation tool Z. .

  The wire 26 passes through the wire guide pipe 23 and extends downward from one end opening 23 a of the wire guide pipe 23, and a tire locking member 27 is attached to the free end of the wire 26 to constitute the tire lifting portion 21. is doing.

  As shown in FIG. 5, the tire locking member 27 includes two upper and lower locking tools 27a and 27b. The upper locking tool 27a has a plate-like long piece shape, and swells at the center thereof. A protruding portion 27a1 is formed, and a through hole 27a2 through which the wire 26 can pass is formed at the center of the bulging portion 27a1. The lower locking tool 27b has a size capable of entering the bulging portion 27a1 of the upper locking tool, and one end of the wire 26 is connected and fixed to the center of the lower locking tool 27b.

  In order to lift the spare tire 7, with the wire 26 loosened, the upper locking tool 27a and the lower locking tool 27b of the tire lifting part 21 are inserted into the center hole 7a of the wheel of the spare tire 7 laid sideways. Further, by winding the wire 26 using the wire winding portion 22, the upper locking tool 27a is engaged with the peripheral edge of the wheel center hole 7a, and the upper locking tool 27a is fitted into the lower locking tool 27b. As a result, the spare tire 7 is lifted.

  FIG. 4 shows a state in which the spare tire 7 is lifted and accommodated (attached) below the rear floor panel 4. The separation distance d between the lateral member 10 and the rear cross member 3 is smaller than the diameter 7D of the spare tire 7, and the tire portion of the spare tire 7 is abutted and supported by the lateral member 10 and the rear cross member 3. It is housed in the state.

  For this reason, the spare tire 7 is supported by the member members 10 and 3 having high rigidity and is housed below the rear floor panel 4 in a stable state.

  Although not carried out in this embodiment, the portion where the spare tire 7 abuts may be recessed to position and accommodate the spare tire 7 more reliably.

  The vehicle body behavior at the time of a rear collision of the lower body structure of the automobile configured as described above will be described with reference to FIG. In order to better understand the behavior of the vehicle body at the time of rear impact of the present embodiment, a description will be given after comparing the behavior of the vehicle body at the time of rear impact with the conventional structure (without the lateral member 10). In addition, about each frame, a member, etc., description is abbreviate | omitted by attaching | subjecting the same code | symbol as the past code | symbol.

a1 and a2 are explanatory views showing the initial stage and the rear stage of the conventional structure.
In the conventional structure, as shown by a1, the horizontal member 10 is not provided, but the vertical member 9 is installed at a position offset to the right side from the virtual center line L at the center in the vehicle width direction.

  Therefore, even when the rear impact load F is received straight from the rear of the vehicle, the vertical member 9 is deformed so as to bend to the left side (upper side in the drawing) as shown by a2, so that the rear impact load F is applied to the vehicle left side. It will act greatly and the rigidity balance on the left and right will be lost.

  Therefore, as the rigidity of the rear part of the vehicle below the rear floor panel 4, the left side of the vehicle is lowered, and as shown by a2, the left rear side frame 1 is greatly deformed.

  On the other hand, b1 and b2 are explanatory diagrams showing the initial stage of the rear impact and the late stage of the rear impact according to the present embodiment. In this embodiment, since the horizontal member 10 is provided as shown by b1, when the rear impact load is received, the vertical member 9 is bent and deformed while the horizontal member 10 is stretched as shown by b2. Therefore, the longitudinal member 9 is buckled and deformed in the longitudinal direction of the vehicle.

  Therefore, as the rigidity of the rear part of the vehicle below the floor panel, a stable rigidity balance can be obtained without losing the right and left rigidity balance as in the conventional structure.

  Therefore, in the present embodiment, by adding one lateral member 10 that performs reinforcement, the rigidity balance can be prevented from being lost, and the rigidity at the time of rear-end collision of the vehicle can be further increased.

  As described above, in this embodiment, the exhaust silencer 6 is disposed on the right rear side frame 1A side, the spare tire 7 is disposed on the left rear side frame 1B side, and the vertical member 9 that supports the spare tire 7 is disposed on the right side. The lateral member 10 is installed on the left rear side frame 1B side while being offset and installed on the rear side frame 1A side.

  For this reason, even if the vertical member 9 is offset, since the horizontal member 10 exists, it is possible to prevent the rigidity balance of the frame portion below the rear floor panel 4 from being broken left and right.

  Therefore, in the lower body structure of the automobile in which the spare tire 7 and the exhaust silencer 6 are mounted below the rear floor panel 4, the spare tire 7 and the exhaust silencer 6 are efficiently arranged, but the rear floor panel 4 is properly positioned at the time of rear-end collision. Can exhibit excellent shock absorption.

  Further, in this embodiment, since the horizontal member 10 extends in the vehicle width direction and connects the vertical member 9 and the left rear side frame 1B, the vertical member 9, the rear cross member 3, the horizontal member 10, and the left side thereof are connected. A frame region surrounded by the rear side frame 1B can be formed.

  Therefore, the spare tire 7 can be stably supported in the region surrounded by each member, and the spare tire 7 can be reliably and stably supported in the region having high rigidity of the rear floor panel 4 so that the spare tire can be used while the vehicle is running. 7 can be suppressed.

  Further, in this embodiment, the height positions of the spare tire 7 and the exhaust silencer 6 are set so as to overlap in a side view, and are arranged in a state where the height positions are substantially matched below the rear floor panel 4. ing.

  For this reason, the occupied space in the height direction of the spare tire 7 and the exhaust silencer 6 below the floor panel can be configured compactly without increasing.

  Therefore, it is possible to secure a large departure angle α of the vehicle and improve the rough road running performance of the vehicle.

  Further, in this embodiment, the spare tire 7 is attached by the tire suspension mechanism 20, and the rear floor is surrounded by the vertical member 9, the rear cross member 3, the horizontal member 10, and the left side rear side frame 1B. The attachment point P of the spare tire 7 is set on the panel 4, and the spare tire 7 is lifted at the position of the rear floor panel 4 surrounded by each member.

  Therefore, the spare tire 7 can be reliably supported in the region of the highly rigid rear floor panel 4 surrounded by each member, and rattling of the spare tire 7 during traveling of the vehicle can be more reliably suppressed.

  In this embodiment, the spare tire 7 is attached by the tire suspension mechanism 20, but the spare tire may be attached by an arm-type link mechanism or the like.

  In addition, the configuration opposite to this embodiment, that is, a configuration in which an exhaust silencer is arranged on the left rear side frame side, a spare tire is arranged on the right rear side frame side, a vertical member is installed on the left side, and a horizontal member is installed on the right side. May be adopted. Also in this case, the same effect as this embodiment can be obtained.

(Second embodiment)
Next, a second embodiment will be described with reference to FIGS. FIG. 7 is a perspective view from below of the rear part of the automobile, FIG. 8 is a bottom view of the rear part of the automobile, and FIG. 9 is a schematic bottom view for explaining the behavior of the vehicle body at the time of rear collision of the vehicle. The overall structure not shown is the same as that of the first embodiment described above, and the same structure as that of the first embodiment is also given the same reference numeral and the description thereof is omitted. .

  In the present embodiment, as shown in FIG. 7, a second vertical member 109 is provided instead of the horizontal member 10 of the first embodiment described above. As shown in FIG. 8, the second vertical member 109 is offset from the virtual center line L at the center in the vehicle width direction, and supports the spare tire 7 by the second vertical member 109.

  Specifically, a second vertical member 109 having the same size and length as the vertical member 9 is disposed so as to extend in the vehicle front-rear direction in the vicinity of the side of the left rear side frame 1B. And the rear cross member 3 are connected.

  Then, the left and right two points of the spare tire 7 are supported by the intermediate portion and the rear end portion of the second vertical member 109.

  In addition, this 2nd vertical member 109 is also formed in the cross-sectional hat shape, and comprises the closed cross section by joining to the upper rear floor panel 4. FIG.

  The rear floor panel 4 between the vertical member 9 and the second vertical member 109 is provided with a wire winding portion 22 of the tire suspension mechanism 20. For this reason, the spare tire 7 is suspended and supported in a highly rigid region of the rear floor panel 4 surrounded by the vertical member 9, the second vertical member 109, and the rear cross member 3.

  With reference to FIG. 9, the behavior of the vehicle body at the time of rear-end collision in the present embodiment will be described. c1 is an explanatory view showing the initial stage of rear impact and c2 is the late stage of rear impact.

  In this embodiment, as shown by c1, since the second vertical member 109 is provided near the side of the left rear side frame 1, the vertical member 9 is offset from the virtual center line L at the center in the vehicle width direction to the right. Even so, since the second vertical member 109 is stretched against the rear impact load F as shown by c2, bending deformation of the vertical member 9 to the left side (upper side in the drawing) can be suppressed.

  Therefore, as in the first embodiment, the vertical member 9 can be buckled and deformed in the vehicle front-rear direction, and the rigidity balance on the left and right of the vehicle body under the rear floor panel 4 is not lost, and a stable rigidity balance as a whole is achieved. Obtainable.

  In particular, in the present embodiment, the second vertical member 109 is also thrust against the rear impact load and buckling deformation occurs, so that the vehicle body rigidity with respect to the rear impact can be further improved than in the first embodiment.

  As described above, according to the present embodiment, by providing the second vertical member 109 extending in the vehicle front-rear direction for connecting the front cross member 2 and the rear cross member 3, the right and left sides are the same as in the first embodiment described above. The rigidity balance in the vehicle can be stabilized and the longitudinally extending members can be increased by using two members extending in the longitudinal direction, so that the vehicle body rigidity with respect to the rear impact can be improved.

  Therefore, the rigidity of the vehicle body at the time of rear impact can be further improved while ensuring the rigidity balance below the rear floor panel.

The spare tire mounting structure and the like are the same as those in the first embodiment.
Other functions and effects are the same as those in the above-described embodiment.

As described above, in the correspondence between the configuration of the present invention and the above-described embodiment,
The reinforcing member of the present invention corresponds to the horizontal member 10 and the second vertical member 109,
Similarly,
The hanging device corresponds to the tire hanging mechanism 20,
The linear member corresponds to the wire 26,
The spare tire suspension point corresponds to the attachment point P,
The present invention is not limited to the above-described embodiment, but includes an embodiment applied to the lower body structure of any automobile.

The perspective view from the lower part of the automobile rear part of a first embodiment. The bottom view of the rear part of a car. FIG. FIG. 3 is a cross-sectional view taken along line AA in FIG. 2. An explanatory sectional view of a hanging mechanism for lifting a spare tire. The schematic bottom view explaining the vehicle body behavior at the time of vehicle rear collision. The perspective view from the lower part of the automobile rear part of a second embodiment. The bottom view of the automobile rear part of a second embodiment. The schematic bottom view explaining the vehicle body behavior at the time of vehicle rear collision of the second embodiment.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 (1A, 1B) ... Rear side frame 2 ... Front side cross member 3 ... Rear side cross member 4 ... Rear floor panel 6 ... Exhaust silencer 7 ... Spare tire 9 ... Vertical member 10 ... Horizontal member (reinforcement member)
20 ... Tire hanging mechanism (hanging device)
109 ... Second vertical member (reinforcing member)
P ... Spare tire attachment point (spare tire suspension point)

Claims (5)

A lower body structure of an automobile in which a spare tire and an exhaust silencer are attached between a pair of left and right rear side frames below a rear floor panel at the rear of the vehicle,
A rear cross member extending in the vehicle width direction at the rear portion of the rear side frame and a front cross member extending in the vehicle width direction with a space from the rear cross member to the vehicle front side are joined to the lower surface of the rear floor panel.
The exhaust silencer is attached to one rear side frame side so as to extend in the vehicle front-rear direction,
A vertical member that supports the spare tire on the other rear side frame side is extended in the vehicle front-rear direction so as to be offset from the vehicle center to the one rear side frame side and connect the front cross member and the rear cross member,
A lower body structure of an automobile in which a reinforcing member for supporting the spare tire is installed on the other rear side frame side from the vertical member. The lower body structure of an automobile according to claim 1, wherein the reinforcing member is a lateral member that extends in the vehicle width direction and connects the longitudinal member and the other rear side frame. The lower body structure of an automobile according to claim 1, wherein the reinforcing member is a second vertical member extending in the vehicle front-rear direction to connect the front cross member and the rear cross member. The lower body structure of the automobile according to claim 1, wherein height positions of the spare tire and the exhaust silencer are set to overlap in a side view. The spare tire is attached by a hanging type apparatus using a linear member,
The lower body structure of the automobile according to claim 1, wherein a spare tire suspension point of the hanging type device is set on a rear floor panel surrounded by at least the vertical member and the rear cross member.

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