JP2008081041A - Lower body structure of automobile - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To improve the stiffness of a body rear part around a tire pan with a simple structure, and sufficiently securing the mounting stiffness of parts for a vehicle. <P>SOLUTION: Lower body structure for an automobile comprises: a pair of right and left side frames 21, 21 longitudinally extended along right and left side parts of a lower surface of a rear floor 13 with tire pan 15; and a cross member 23 extended in a vehicle width direction to connect the pair of rear side frames 21, 21; and a tire pan corresponding part 31 arranged along a peripheral part of a longitudinally predetermined range including a front end part of the tire pan 15; and side extension parts 33, 33 extended to the outside in the vehicle width direction from right and left side parts of the tire pan corresponding part 31 and having outer end parts connected to the rear side frames 21. Parts for a vehicle (for example, seat rails 7) are mounted on the rear floor 13 overlapped with an installation part of the cross member 23 in a planar view. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a rear floor provided in a state where a tire pan forming a space for accommodating a spare tire projects downward, a pair of left and right rear side frames extending in the front-rear direction along the left and right sides of the lower surface of the rear floor, and a vehicle. The present invention relates to a lower body structure of an automobile provided with a cross member extending in the width direction and connecting the pair of rear side frames.

Conventionally, as shown in Patent Document 1 below, the vehicle extends in the vehicle width direction so as to straddle the tire pan on the lower surface of a rear floor (floor panel) provided with a tire pan (storage portion) for storing a spare tire at the rear portion. A first cross member and a second cross member extending in the vehicle width direction on the front side of the first cross member so as to pass through the vicinity of the front end portion of the tire pan are provided, of which the second cross member An anchor of a seat belt for a rear seat as a vehicle part is fixed on a rear floor that overlaps with an installation portion in plan view. According to the lower vehicle body structure of Patent Document 1, it is possible to achieve both the rigidity enhancement of the rear portion of the vehicle body around the tire pan and the securing of the mounting rigidity of the vehicle parts.
Japanese Utility Model Publication 2-28129

  However, when two cross members are provided in parallel in the tire pan installation portion and the vicinity thereof as in Patent Document 1, a great reinforcing effect can be expected from these two cross members, but the structure is complicated. There has been a problem that an increase in manufacturing cost due to unavoidable.

  The present invention has been made in view of the circumstances as described above, and it is possible to improve the rigidity of the rear part of the vehicle body around the tire pan with a simpler configuration and to sufficiently secure the mounting rigidity of the vehicle parts. An object of the present invention is to provide a lower body structure of an automobile that can be used.

  In order to solve the above problems, the present invention provides a rear floor provided with a tire pan that forms a storage space for a spare tire projecting downward, and a front-rear direction along the left and right sides of the lower surface of the rear floor. A lower body structure of an automobile including a pair of left and right rear side frames extending in a vehicle width direction and a cross member extending in a vehicle width direction and connecting the pair of rear side frames, wherein the cross member includes a front end portion of the tire pan. A tire pan corresponding portion disposed along a peripheral portion of a predetermined range including the front and rear direction, and extending from the left and right ends of the tire pan corresponding portion to the outside in the vehicle width direction, and the outer end portion is connected to the rear side frame. Vehicle parts are mounted on the rear floor at positions overlapping with the cross member installation portion in plan view. Those characterized (claim 1).

  According to the present invention, the cross member connecting the pair of left and right rear side frames installed on the lower surface of the rear floor, the tire pan corresponding portion disposed along the peripheral portion of the tire pan, and the left and right ends of the tire pan corresponding portion. Side extension part that extends outward in the vehicle width direction and connected to the rear side frame is provided, so that the rear part of the vehicle body around the tire pan can be effectively constructed with a simple configuration by simply installing a single cross member. Can be reinforced. In addition, since the vehicle component is mounted on the rear floor that overlaps with the cross member installation portion in plan view, there is an advantage that the mounting rigidity of the vehicle component can be sufficiently secured.

  The cross member is formed in a step shape in a cross-sectional view, and the tire pan corresponding portion of the cross member is fixed to a tire pan fixing portion fixed to the tire pan and a rear floor body around the tire pan. It is preferable that a floor fixing portion is formed (claim 2).

  As described above, when the cross member is formed in a stepped shape in a cross-sectional view, there is an advantage that a degree of freedom in forming at the time of press forming or the like can be sufficiently obtained while the cross-section coefficient of the cross member is secured to a certain extent. For this reason, for example, unlike the case where the cross member is molded in a hat shape in cross-sectional view with relatively large molding restrictions, the cross member (longitudinal direction) having the tire pan corresponding part and the side extension part as described above is used. Can be easily formed, and the rigidity of the cross member can be sufficiently ensured. In addition, a tire pan fixing portion fixed to the tire pan and a floor fixing portion fixed to the rear floor body around the tire pan are provided on the tire pan corresponding portion of the cross member, and the tire pan and the rear floor main body are Since the members are connected to each other through the members, there is an advantage that the reinforcing effect by the cross members can be further enhanced.

  When a jack is attached to the inside of the tire pan via a mounting bracket, the tire pan fixing portion of the cross member is provided at a position overlapping the installation portion of the mounting bracket of the jack in plan view. (Claim 3).

  As described above, when the tire pan fixing portion of the cross member is provided at a position overlapping with the installation portion of the mounting bracket of the jack in plan view, the location where the rigidity is sufficiently secured by the mounting bracket of the jack and the above There is an advantage that the rear floor main body can be connected via a cross member, and the reinforcing effect of the cross member can be further enhanced by using existing parts.

  The laterally extending portion of the cross member is formed with a frame fixing portion that is fixed to a lower end portion of the rear side frame and a side floor fixing portion that is fixed to a side portion of the rear floor main body. (Claim 4).

  In this way, the highly rigid rear side frame and the rear floor body can be connected via the cross member, and the reinforcing effect of the cross member can be further enhanced.

  The vehicle component is a seat rail that extends in the front-rear direction of the vehicle body and supports the rear seat so as to be slidable in the front-rear direction. The rear end of the seat rail extends to the installation portion of the cross member, and the rear floor on the installation portion. It is preferable to be fixed to the main body (Claim 5).

  As described above, when the rear end portion of the seat rail supporting the rear seat is fixed to the rear floor body on the installation portion of the cross member, the seat rail can be stably attached to the high rigidity portion. The support rigidity of the rear seat supported by the can be effectively improved. In addition, since the seat rail extending in the front-rear direction of the vehicle body and the cross member extending in the vehicle width direction are indirectly connected, the load in the front-rear direction and the left-right direction acting on the rear portion of the vehicle body is more efficiently distributed to the surrounding vehicle body parts. There is an advantage that the rigidity of the rear part of the vehicle body can be improved more effectively.

  When the rear seat includes a first rear seat and a second rear seat disposed on the rear side of the first rear seat, the rear end portion of the seat rail corresponds to the tire pan corresponding portion of the cross member. An inner rail that extends to the installation portion and supports the first rear seat; and an outer rail whose rear end portion extends to the installation portion of the laterally extending portion of the cross member and supports the second rear seat. (Claim 6).

  In this way, the mounting rigidity of each seat rail (inner rail and outer rail) that supports a plurality of rows of rear seats can be effectively improved by using one cross member, and the rigidity of the rear part of the vehicle body can be further increased. It can be improved effectively.

  In the above configuration, when the rear member further includes a rear suspension tower standing upright from the left and right side portions of the rear floor, and a gusset member attached across the rear suspension tower and the rear floor, the cross member is It is preferable to be connected to the rear suspension tower via the gusset member.

  In this way, when the high-rigidity rear suspension tower and the cross member are connected using the gusset member that is mounted between the rear suspension tower and the rear floor, the rigidity of the rear part of the vehicle body is further improved. There is an advantage that can be made.

  As described above, according to the present invention, it is possible to improve the rigidity of the rear part of the vehicle body around the tire pan with a simpler configuration, and to sufficiently secure the mounting rigidity of the vehicle parts. A lower body structure can be provided.

  FIG. 1 shows a situation in a passenger compartment of an automobile according to an embodiment of the present invention. On the passenger compartment floor 1 of this automobile, a middle row seat 2 (corresponding to a first rear seat according to the present invention) comprising a left seat 2a and a right seat 2b independent from each other is disposed. On the rear side of the seat 2, a so-called bench seat type rear row seat 3 (corresponding to a second rear seat according to the present invention) is disposed. Although not shown, a front row seat including a driver seat and a passenger seat is disposed on the front side of the middle row seat 2. Hereinafter, when the middle row seat 2 and the rear row seat 3 are collectively referred to in this specification, they are referred to as rear seats 2 and 3. In FIG. 1, reference numeral 4 denotes a wheel house for a rear wheel, and 5 denotes a side sill.

  FIG. 2 is a plan view of the passenger compartment floor 1 as seen from above with the rear seats 2 and 3 removed, and FIG. 3 is a plan view of the passenger compartment floor 1 as seen from below. As shown in these drawings, the passenger compartment floor 1 is installed on the front side of the rear floor 13 having a tire pan 15 forming a spare tire housing space (not shown) formed at the rear end thereof, and on the front side of the rear floor 13. The front floor 11 is made up of. The tire pan 15 of the rear floor 13 protrudes downward (the back side of the paper in FIG. 2 and the front side of the paper in FIG. 3) with respect to the rear floor main body 14 formed in the periphery thereof, so The recessed part opened in is formed.

  As shown in FIGS. 1 and 2, a seat rail 7 that supports the rear seats 2 and 3 so as to be slidable back and forth is disposed on the passenger compartment floor 1. The seat rail 7 includes a pair of left and right outer rails 8, 8 extending in the front-rear direction in the vicinity of the left and right ends of the vehicle interior, and a pair of left and right outer rails 8, 8 extending in the front-rear direction between the outer rails 8, 8. The inner row seat 9 and the rear row seat 3 are supported along the outer rail 8 and the inner rail 9 so as to be slidable back and forth. More specifically, the left and right seats 2a, 2b of the middle row seat 2 are supported so as to be slidable back and forth along one of the inner rails 9, 9 and the outer rail 8 adjacent thereto. The rear row seat 3 is supported so as to be slidable back and forth along the pair of left and right outer rails 8 and 8.

  The outer rails 8, 8 are disposed so that rear end portions thereof are located on both the left and right sides of the tire pan 15, and are fixed on the passenger compartment floor 1 via rail brackets 17a to 17c. On the other hand, the inner rails 9, 9 having a shorter overall length than the outer rail 8 are disposed so that rear end portions thereof are located on the front side of the tire pan 15, and are arranged on the passenger compartment floor via rail brackets 19 a to 19 c. 1 is fixed.

  As shown in FIGS. 2 to 4, a pair of rear side frames 21, 21 extending in the front-rear direction along the left and right side portions are installed on the lower surface of the passenger compartment floor 1. A cross member 23 that connects the rear portions of the rear side frames 21 and 21 is installed along the lower surface of the rear floor 13 so as to extend in the vehicle width direction. Further, a cross member 27 (see FIG. 3) different from the above is installed on the lower surface of the passenger compartment floor 1 (the rear end portion of the front floor 11). Further, between the cross member 27 and the cross member 23, a reinforcing plate for reinforcing the rear floor 13 where the rear ends of the inner rails 9, 9 are attached (where the rail bracket 19a is attached). 25 is installed.

  As shown in FIGS. 4 and 5, the rear side frame 21 is formed in a hat shape in cross section to form a closed cross section with the passenger compartment floor 1, and flanges formed on both left and right side portions thereof. The portion is fixed to the vehicle compartment floor 1 by being joined to the lower surface of the vehicle compartment floor 1 (the front floor 11 and the rear floor 13) by spot welding or the like.

  As shown in FIGS. 2 to 4, the cross member 23 includes a tire pan corresponding portion 31 disposed along a peripheral portion of a predetermined range in the front-rear direction including the front end portion of the tire pan 15, and the tire pan corresponding portion. 31 has laterally extending portions 33, 33 that extend outward from the left and right ends of the vehicle 31 in the vehicle width direction and whose outer ends are connected to the rear side frame 21. In this embodiment, as shown in FIG. 2, the front side a of the tire pan 15 and the inclined side parts b and b extending obliquely rearward on the vehicle outer side from the left and right ends of the front side a are provided. Although the tire pan corresponding portion 31 is formed as described above, the tire pan corresponding portion 31 may be formed over a range including a part of the rear side portions c and c.

  As shown in FIGS. 3, 4, 6, and 7, a flange portion 34 that is joined to the lower surface portion of the rear floor main body 14 by spot welding or the like is formed at the upper end portion of the cross member 23. The cross member 23 is fixed to the rear floor main body 14 via the flange portion 34. The flange portion 34 is provided across the tire pan corresponding portion 31 and the side extending portion 33, and as shown in FIG. 4, a tire pan corresponding flange for fixing the tire pan corresponding portion 31. A portion 34a (corresponding to the floor fixing portion according to the present invention) and a side flange portion 34b (corresponding to the side floor fixing portion according to the present invention) for fixing the side extending portion 33. Yes. Of these, the front side portion of the tire pan corresponding flange portion 34 a is fixed to the rear floor main body 14 via the reinforcing plate 25.

  As shown in FIGS. 3, 4, and 6, the tire pan corresponding portion 31 of the cross member 23 is provided with a protruding portion 32 that protrudes downward along the front wall portion of the tire pan 15. A joining piece 32a (corresponding to a tire pan fixing portion according to the present invention) is formed at the lower end portion of the projecting portion 32 and joined to the step portion 16 formed on the front wall portion of the tire pan 15 by spot welding or the like. The tire pan corresponding portion 31 is fixed to the tire pan 15 via the joining piece 32a.

  Further, as shown in FIGS. 3 to 5, the laterally extending portion 33 of the cross member 23 is joined to a lower end portion of the rear side frame 21 by spot welding or the like (the frame according to the present invention). The side extending portion 33 is fixed to the rear side frame 21 via the joining piece 35.

  The cross member 23 configured as described above is formed in a stepped shape in a cross-sectional view, as can be seen from, for example, FIGS. That is, the shape of the cross member 23 in a cross-sectional view includes a horizontal wall portion (for example, the flange portion 34 and the joining piece 32a corresponding to this portion) formed in a plurality of height positions and extending in a substantially horizontal direction, It has a shape having a vertical wall portion extending in the vertical direction so as to connect opposite end portions of the horizontal wall portion.

  As shown in FIGS. 2 and 6, a mounting bracket 29 for fixing a jack (not shown) as an in-vehicle tool is installed inside the tire pan 15. The mounting bracket 29 has a joining piece 29a joined to the inner wall of the tire pan 15 at the front end, and the joining piece 29a is formed on the tire pan 15 to which the joining piece 32a of the cross member 23 is joined. The step 16 is overlapped and joined. In other words, the joining piece 32a (tire pan fixing part) of the cross member 23 is provided at a position overlapping the installation part of the mounting bracket 29 (joining piece 29a thereof) in plan view.

  As shown in FIG. 2, the seat rail 7 has a rear end portion extending to an installation portion of the cross member 23, and rail brackets 17a and 19a provided at positions overlapping the cross member 23 in plan view. Via the rear floor body 14 around the tire pan 15. For example, the outer rail 8 of the seat rail 7 has a rear end portion extending to an installation portion of the laterally extending portion 33 of the cross member 23 and partially overlaps with the laterally extending portion 33 in plan view. It is fixed on the rear floor main body 14 via a rail bracket 17a provided at a position where the On the other hand, the inner rail 9 has a rear end portion extending to an installation portion of the tire pan corresponding portion 31 of the cross member 23, and a rail bracket provided at a position partially overlapping with the tire pan corresponding portion 31 in plan view. It is fixed on the rear floor main body 14 via 19a.

  As shown in FIG. 5, the rail bracket 17a for fixing the rear end portion of the outer rail 8 is located above the installation portion of the rear side frame 21, and the flange portion of the rear side frame 21 and the rear floor body 14 thereon. At the same time, it is fixed by being fastened with bolts and nuts 39 together. In FIG. 5, the rail bracket 17 a and the rear floor main body 14 are further fixed to each other via a locking fastener 40. The rail bracket 19a for fixing the rear end portion of the inner rail 9 includes a reinforcing plate 25 and a rear floor above the reinforcing plate 25, as shown in FIGS. It is fixed by being fastened together with the main body 14 with bolts and nuts 41.

  As described above, according to the above embodiment, the tire disposed along the peripheral edge of the tire pan 15 on the cross member 23 that connects the pair of left and right rear side frames 21 and 21 installed on the lower surface of the rear floor 13. Since the pan corresponding portion 31 and the side extending portions 33, 33 extending from the left and right ends of the tire pan corresponding portion 31 to the outside in the vehicle width direction and connected to the rear side frame 21 are provided, a single cross member is provided. The rear portion of the vehicle body around the tire pan 15 can be effectively reinforced with a simple configuration in which only 23 is installed.

  That is, for example, when a load is applied from the front of the vehicle body, as shown by an arrow in FIG. 8, the load is distributed to the left and right sides of the tire pan 15 via the tire pan corresponding portion 31, and the tire pan corresponding portion 31. The load can be transmitted to the pair of left and right rear side frames 21 and 21 through the laterally extending side portion 33, and the deformation of the rear portion of the vehicle body caused by the load is suppressed, and the rigidity of the portion is effectively reduced. Can be improved. On the other hand, when a load is applied from the side of the vehicle body, as shown by an arrow in FIG. 9, the load is applied from the rear side frame 21 on the side to which the load is applied through the side extension portion 33 and the tire pan corresponding portion 31. The load can be transmitted to the side rear side frame 21, and the rigidity of the rear portion of the vehicle body with respect to the load can be effectively improved. In addition, by transmitting the load in such a way as to bypass the tire pan 15, stress concentrates on the boundary portion between the tire pan 15 and the rear floor main body 14 having a large cross-sectional change so that the portion is greatly deformed. It is possible to efficiently disperse the load while avoiding a serious situation.

  Furthermore, in the above embodiment, since the rear end portion of the seat rail 7 is mounted on the rear floor main body 14 that overlaps with the installation portion of the cross member 23 in plan view, the mounting rigidity of the seat rail 7 can be sufficiently secured. It is possible to effectively improve the support rigidity of the rear seats 2 and 3 supported by the vehicle. Further, since the seat rail 7 extending in the front-rear direction of the vehicle body and the cross member 23 extending in the vehicle width direction are indirectly connected to reinforce each other, the load in the front-rear direction and the left-right direction acting on the rear portion of the vehicle body is reduced. There is an advantage that the vehicle body can be more efficiently distributed to each part of the surrounding vehicle body, and the rigidity of the rear part of the vehicle body can be improved more effectively.

  Further, when the cross member 23 is formed in a stepped shape in a cross-sectional view as in the above embodiment, the cross member 23 has a sufficiently high cross-sectional modulus and has a sufficient degree of molding freedom during press molding or the like. There is an advantage that it can be obtained. For this reason, for example, unlike the case where the cross member 23 is molded in a hat shape in a sectional view having relatively large molding restrictions, the cross member having the tire pan corresponding portion 31 and the side extending portion 33 as described above. 23 (the cross member 23 having a shape having a plurality of bent portions along the longitudinal direction) can be easily formed, and the rigidity of the cross member 23 can be sufficiently secured. Moreover, a joining piece 32a (tire pan fixing portion) fixed to the tire pan 15 and a tire pan corresponding flange portion 34a fixed to the rear floor body 14 around the tire pan 15 are attached to the tire pan corresponding portion 31 of the cross member 23. (Floor fixing portion) is provided, and the tire pan 15 and the rear floor main body 14 are connected to each other via the cross member 23. Therefore, there is an advantage that the reinforcing effect by the cross member 23 can be further enhanced. .

  In addition, when the joining piece 32a (tire pan fixing portion) of the cross member 23 is provided at a position overlapping with the installation portion of the jack mounting bracket 29 in plan view as in the above embodiment, the mounting of the jack The portion where the rigidity is sufficiently secured by the bracket 29 and the rear floor main body 14 can be connected via the cross member 23, and the reinforcing effect by the cross member 23 can be further enhanced by using existing parts. There are advantages.

  Further, as in the above embodiment, the side extension portion 33 of the cross member 23 is joined to the joining piece 35 (frame fixing portion) fixed to the lower end portion of the rear side frame 21, and the side portion of the rear floor main body 14. When the side flange portion 34b (side floor fixing portion) fixed to the vehicle is provided, the highly rigid rear side frame 21 and the rear floor main body 14 can be connected via the cross member 23. There is an advantage that the reinforcing effect by the cross member 23 can be further enhanced.

  Further, as in the above-described embodiment, as the seat rail 7, outer rails 8 and 8 that support the rear row seat 3 and inner rails 9 and 9 that support the middle row seat 2 (and the rear row seat 3) are provided. When the rear end portions of the rails 8 and 9 are fixed at the installation portion of the tire pan corresponding portion 31 and the side extending portion 33 of the cross member 23, a plurality of rows of rear seats 2 and 3 are supported. The mounting rigidity of the rails 8 and 9 can be effectively improved by using one cross member 23, and the rigidity of the rear part of the vehicle body is more effectively improved by using the rails 8 and 9 as reinforcing members. There is an advantage that can be made.

  In the above embodiment, the rear end portion of the seat rail 7 is mounted on the rear floor 13 that overlaps with the installation portion of the cross member 23 in plan view. However, for example, other vehicle parts such as an anchor of a seat belt are attached to the relevant portion. You may attach to.

  Although not described in the above embodiment, as shown in FIG. 10, a rear suspension is attached to the left and right sides of the rear floor 13 and to the rear end of the wheel house 4 (FIG. 1). A rear suspension tower 42 is erected upward, and a gusset member 43 for preventing the rear suspension tower 42 from falling down between a lower end portion of the rear suspension tower 42 and a side end portion of the rear floor main body 14. Since the gusset member 43 may be used, the reinforcing effect of the cross member 23 may be further enhanced. That is, if the gusset member 43 is fastened together with the rear floor main body 14 and the lower cross member 23 with a fastening member (bolts and nuts 45 in the illustrated example), the gusset member 43 has high rigidity. Since the rear suspension tower 42 and the cross member 23 can be connected, the rigidity of the rear portion of the vehicle body can be further improved.

1 is a plan view of a vehicle interior for showing a lower body structure of an automobile according to an embodiment of the present invention. It is the top view which looked at the passenger compartment floor in the state where a sheet was removed from the upper side. It is the top view which looked at the compartment floor from the lower side. FIG. 4 is a cross-sectional perspective view showing a state in which the rear floor is viewed obliquely from below along with a cross section taken along line IV-IV in FIG. 3. FIG. 5 is a cross-sectional perspective view showing details of a connecting portion between the cross member and the rear side frame together with a cross section taken along the line V-V in FIG. 3. It is sectional drawing along the VI-VI line of FIG. It is sectional drawing along the VII-VII line of FIG. It is a figure which shows the transmission condition of a load when a load is input into the vehicle body rear part from the front. It is a figure which shows the transmission condition of a load when a load is input into the vehicle body rear part from the side. It is a figure for demonstrating the modification of the lower vehicle body structure of the motor vehicle of this invention, and is a figure corresponded in the XX cross section of FIG.

Explanation of symbols

2 Middle row seat (first rear seat)
3 Rear row seat (second rear seat)
7 Seat rail 8 Outer rail 9 Inner rail 13 Rear floor 15 Tire pan 21 Rear side frame 23 Cross member 29 Mounting bracket 31 Tire pan corresponding part 32a Joint piece (tire pan fixing part)
33 Side extension part 34a Flange part corresponding to tire pan (floor fixing part)
34b Side flange (side floor fixing part)
35 Joining piece (frame fixing part)
42 Rear suspension tower 43 Gusset member

Claims (7)

A rear floor provided with a tire pan that forms a spare tire housing space projecting downward, a pair of left and right rear side frames extending in the front-rear direction along the left and right sides of the lower surface of the rear floor, and extending in the vehicle width direction A lower body structure of an automobile comprising a cross member connecting the pair of rear side frames,
The cross member extends to the outside in the vehicle width direction from a tire pan corresponding portion disposed along a peripheral portion of a predetermined range in the front-rear direction including a front end portion of the tire pan, and left and right end portions of the tire pan corresponding portion, A laterally extending portion connected to the rear side frame at an outer end thereof;
A vehicle lower body structure, wherein a vehicle component is mounted on the rear floor at a position overlapping with the cross member installation portion in plan view. The lower body structure of an automobile according to claim 1,
The cross member is formed in a step shape in a cross-sectional view,
The tire pan corresponding part of the cross member is formed with a tire pan fixing part fixed to the tire pan and a floor fixing part fixed to a rear floor body around the tire pan. The lower body structure of an automobile. In the lower body structure of an automobile according to claim 2,
Inside the tire pan, a jack is attached via a mounting bracket,
A lower body structure of an automobile, wherein a tire pan fixing portion of the cross member is provided at a position overlapping with an installation portion of a mounting bracket of the jack in plan view. The lower body structure of an automobile according to claim 2 or 3,
The laterally extending portion of the cross member is formed with a frame fixing portion that is fixed to a lower end portion of the rear side frame and a side floor fixing portion that is fixed to a side portion of the rear floor main body. The lower body structure of an automobile characterized by The lower body structure of the automobile according to any one of claims 1 to 4,
The vehicle component is a seat rail that extends in the front-rear direction of the vehicle body and supports the rear seat so as to be slidable in the front-rear direction. The rear end portion of the seat rail extends to the installation portion of the cross member, and the rear floor on the installation portion. A lower body structure of an automobile characterized by being fixed to a main body. In the lower body structure of an automobile according to claim 5,
The rear seat has a first rear seat and a second rear seat disposed on the rear side of the first rear seat,
The seat rail includes an inner rail that supports the first rear seat by extending a rear end portion of the cross member to a tire pan-corresponding portion of the cross member, and a rear end portion of the cross member that extends laterally. And an outer rail that extends to a portion and supports the second rear seat. The lower body structure of an automobile according to any one of claims 1 to 6,
A rear suspension tower erected upward from the left and right sides of the rear floor;
A gusset member mounted across the rear suspension tower and the rear floor,
The lower body structure of an automobile, wherein the cross member is connected to a rear suspension tower through the gusset member.

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