Rear body structure

Abstract

To secure the rigidity of a rear floor panel provided with a concavity.SOLUTION: A vehicle body rear section structure includes: a rear floor panel 10; and suspension towers 16 which are placed at respective sides of the rear floor panel 10, and which surround respective shock absorbers. The rear floor panel 10 is provided with a concavity 11 concaved downwardly relative to a vehicle. The concavity 11 is provided with a cross member 20 that extends in the vehicle widthwise direction. Respective ends of the cross member 20 in the vehicle widthwise direction are connected to the respective suspension towers 16, and the cross member 20 is provided at the upper-surface side of the concavity 11.SELECTED DRAWING: Figure 1

Description

[Technical field]

[0001] The present invention relates to a rear vehicle body structure. [Background technology]

[0002] A rear floor panel is provided at the rear of the vehicle body. For example, as disclosed in Patent Document 1, a structure in which the rear floor panel constitutes the floor of a luggage compartment at the rear of the vehicle is known. Such a rear floor panel has a large flat portion, and therefore tends to have a low surface rigidity.

[0003] The rear floor panel is also provided with a recess in which a spare tire can be accommodated. In order to support the weight of the spare tire when it is mounted, the rear floor panel is required to have a certain level of surface rigidity. In the structure disclosed in Patent Document 1, a cross member is joined to the rear floor panel to ensure the surface rigidity of the rear floor panel. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] Patent No. 3493361 Summary of the Invention [Problem to be solved by the invention]

[0005] In the rear floor panel having a recess as in the above example, multiple bent portions are formed, and deformation is likely to occur starting from the bent portions. In the above example, the cross member connecting the left and right strut housings is provided to suppress deformation, but the bent portions formed in the recess are not reinforced.

[0006] Therefore, in the structure of the above example, deformation is likely to occur starting from the bent portion when a load is applied. Therefore, there is room for improvement in the structure of the above example in terms of ensuring the rigidity of the rear floor panel having the recess.

[0007] The present invention has been made to solve the above-mentioned problems, and its object is to provide a rear vehicle body structure that can ensure the rigidity of a rear floor panel having a recess. [Means for solving the problem]

[0008] In order to achieve the above object, the present invention provides a rear vehicle body structure that includes a rear floor panel provided at the rear of the vehicle body, and suspension towers that are disposed on both sides of the rear floor panel in the vehicle width direction and surround shock absorbers that extend in the vehicle up-down direction, and a recess that is recessed toward the bottom of the vehicle is provided in a middle portion of the rear floor panel in the vehicle width direction. the recess has a bottom surface portion and a side wall portion extending from an end of the bottom surface portion toward the upper side of the vehicle and surrounding at least a portion of the bottom surface portion, and an outer shape of a portion of the bottom surface portion of the recess that is on the vehicle front side relative to a center in a vehicle front-rear direction is semicircular, A cross member extending in the vehicle width direction is provided in the recess. A vehicle front-rear direction intermediate portion of the recess and a rear portion of the semicircular portion It is provided, The cross member has a plurality of long straight portions and a plurality of bent portions formed by bending the straight portions, and the thickness of the bent portions is formed to be thicker than the thickness of the straight portions and the thickness of the side wall portions. The cross member has a widthwise end connected to the suspension tower, and the cross member is provided on the upper surface side of the recess. Effect of the Invention

[0009] According to the present invention, it is possible to ensure the rigidity of a rear floor panel having a recess. [Brief description of the drawings]

[0010] [Figure 1] 1 is a plan view showing an embodiment of a vehicle rear structure according to the present invention. [Diagram 2] FIG. 2 is a perspective view of the rear vehicle body structure of FIG. 1 as viewed from the vehicle front side, with the cross member omitted. [Diagram 3] FIG. 3 is a rear view of FIG. 2. [Figure 4] FIG. 4 is an enlarged rear view of part A in FIG. 3. [Diagram 5] FIG. 4 is an enlarged rear view of part B in FIG. 3. [Figure 6] FIG. 2 is a plan view showing a modified example of the cross member in FIG. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0011] Hereinafter, an embodiment of a vehicle rear body structure according to the present invention will be described with reference to the drawings (FIGS. 1 to 6). In the drawings, the direction of the arrow Fr indicates the front in the vehicle longitudinal direction. In the description of the embodiment, the "front (front end) and rear (rear end)" correspond to the front and rear in the vehicle longitudinal direction. Also, the arrows R and L indicate the right and left sides when an occupant looks forward of the vehicle.

[0012] The rear vehicle body structure of this embodiment has a rear floor panel 10, a rear side member 13, a suspension tower 16, a rear wheel house panel 15, a cross member 20, and a rear skirt panel 12.

[0013] The rear floor panel 10 is a member disposed at the rear of the vehicle body, as shown in Figures 1 and 2, and in this example, is a metal member that constitutes the floor of the luggage compartment. A recess 11 that is recessed downward from the upper surface 10a is provided at the middle part of the rear floor panel 10 in the vehicle width direction. The recess 11 will be described in detail later.

[0014] 1 and 2, the rear side members 13 are highly rigid components constituting the vehicle body frame, and are disposed on both sides in the vehicle width direction on the underside of the rear floor panel 10. The rear side members 13 extend in the vehicle front-rear direction, and have a U-shaped cross section that opens toward the top of the vehicle when viewed in the vehicle front-rear direction. Although not shown in detail, a flange is provided on the edge of the opening at the top of the rear side member 13, and the flange is joined to the underside of the rear floor panel 10 by spot welding or the like.

[0015] The rear wheel house panel 15 is a panel material that covers the rear wheel (not shown) from the upper side of the vehicle, and is disposed on the outer side of the rear floor panel 10 in the vehicle width direction. The rear wheel house panel 15 bulges outward from the inner wall of the quarter panel 17 that constitutes the side wall of the rear part of the vehicle body. In this example, the rear wheel house panel 15 bulges outward from the middle part of the quarter panel 17 in the vehicle up-down direction toward the inner side of the vehicle cabin as it moves downward. The lower end of the rear wheel house panel 15 is connected to the outer side of the upper surface 10a of the rear floor panel 10 in the vehicle width direction. In this example, the lower end of the rear wheel house panel 15 is connected to the outer side of the rear side member 13 in the vehicle width direction via the rear floor panel 10.

[0016] The suspension tower 16 is a portion to which a shock absorber (not shown) is attached, and is provided on the rear wheel house panel 15. In this example, as shown in Figs. 1 and 2, the suspension tower 16 is a portion in which the middle portion of the rear wheel house panel 15 in the vehicle front-rear direction is recessed downward of the vehicle, and is provided with a circular bottom surface. The suspension tower 16 has a cylindrical side wall surface extending upward from the circular bottom surface. The circular bottom surface is provided with a mounting portion 16a to which an upper portion of a shock absorber is attached. For example, as shown in Fig. 1, the mounting portion 16a has a through hole provided on the bottom surface, and the upper end of the shock absorber is attached by a fastening member such as a bolt. The shock absorber is a member extending downward of the vehicle from the circular bottom surface.

[0017] 1 to 3, the rear skirt panel 12 is disposed at the rear end of the vehicle body, is a plate-like member that constitutes the rear wall of the vehicle body, and extends in the vehicle width direction. A back door opening 18 that allows access to the luggage compartment from outside the vehicle is provided at the rear of the vehicle body. The rear skirt panel 12 extends from the rear end of the rear floor panel 10 toward the top of the vehicle, and is disposed below the back door opening 18.

[0018] Here, the recess 11 of the rear floor panel 10 will be described. As shown in Figs. 1 and 2, the recess 11 can accommodate a spare tire and has a bottom surface 11a and side wall portions 11b. The bottom surface 11a is a flat portion that is disposed below the vehicle with respect to the flat upper surface 10a of the rear floor panel 10, and the outer shape of the bottom surface 11a in this example is formed into a substantially semicircular shape in a portion forward of the center of the bottom surface 11a in the vehicle front-rear direction, and extends toward the rear of the vehicle in a portion rearward of the center.

[0019] The side wall portion 11b is a wall surface that extends upward from the outer peripheral end of the bottom surface portion 11a by bending the outer peripheral end of the bottom surface portion 11a upward from the vehicle. The contour shape of the upper end of the side wall portion 11b is curved along the shape of the outer peripheral end of the bottom surface portion 11a in a top view. The side wall portion 11b in this example is U-shaped in a top view, opening toward the rear of the vehicle, and has a slightly narrowed opening.

[0020] Moreover, the side wall portion 11b is slightly inclined in a direction away from the bottom surface portion 11a from the outer peripheral end of the bottom surface portion 11a toward the upper part of the vehicle. That is, the bent portion formed by the bottom surface portion 11a and the side wall portion 11b is formed at an obtuse angle, and the opening area of ​​the recess 11 is formed to be slightly larger than the area of ​​the bottom surface portion 11a. The side wall portion 11b is not provided at the rear end portion of the bottom surface portion 11a, but is closed by the rear skirt panel 12.

[0021] Next, the cross member 20 will be described. As shown in Figs. 3 to 5, the cross member 20 has a central member 21 provided in the recess 11 and an outer reinforcing member 22 provided on the outer side of the central member 21 in the vehicle width direction. In this example, the central member 21 of the cross member 20 is disposed so as to cross the upper surface side of the recess 11, and has an intermediate portion (straight portion) 21a, a vertical portion (straight portion) 21b, and an outer portion (straight portion) 21c. The intermediate portion 21a is a portion extending in the vehicle width direction, and is joined to the center of the bottom surface portion 11a of the recess 11 in the vehicle front-rear direction. The outer portion in the vehicle width direction of the intermediate portion 21a is provided with a lower bent portion 25a bent upwardly of the vehicle. The vertical portion 21b is a portion extending upwardly of the vehicle from the lower bent portion 25a. The vertical portion 21b is inclined along the side wall portion 11b of the recess 11. An upper bent portion 25b that is bent outward in the vehicle width direction is provided at the upper end of the vertical portion 21b, and the outer portion 21c extends outward in the vehicle width direction from the upper bent portion 25b at the upper end of the vertical portion 21b.

[0022] As shown in Fig. 4 and Fig. 5, the outer reinforcing member 22 has a bottom portion (straight portion) 22a and a vertical wall portion (straight portion) 22b, and has a substantially L-shaped cross section when viewed in the vehicle front-rear direction. The bottom portion 22b is a portion extending in the vehicle width direction, one end of which is joined to the vehicle width direction end of the outer portion 21c of the central member 21, and the other end is disposed at the lower portion of the suspension tower 16. The other end is provided with an outer bent portion 25c that is bent upwardly of the vehicle. The vertical wall portion 22b extends upwardly of the vehicle from the outer bent portion 25c at the other end of the bottom portion 22a along the side wall of the suspension tower 16. The upper end of the vertical wall portion 22b is joined to the suspension tower 16.

[0023] In this embodiment, the bent portions 25a, 25b, and 25c have a lower bent portion 25a, an upper bent portion 25b, and an outer bent portion 25c. As described above, by providing the cross member 20 along the bent portions 25a, 25b, and 25c, it is possible to suppress deformation starting from the bent portions 25a, 25b, and 25c of the recess 11. In addition, by disposing the cross member 20 in the central region of the bottom surface portion 11a of the rear floor panel 10, the flat portion of the bottom surface portion 11a is divided into two regions. As a result, the area of ​​the flat portion is reduced, and the surface rigidity is improved. Furthermore, the improvement in surface rigidity makes it possible to suppress floor vibration, and as a result, it is possible to reduce the noise level inside the vehicle cabin.

[0024] Furthermore, if the cross member 20 is disposed on the outside of the vehicle cabin (on the underside of the rear floor panel 10), it will interfere with the shock absorbers and rear side member 13, restricting the shape and layout of the cross member 20 and resulting in reduced freedom of design. In contrast, in this embodiment, the cross member 20 is disposed on the inside of the vehicle cabin (on the upper surface 10a of the rear floor panel 10), eliminating the above-mentioned restrictions and improving freedom of design.

[0025] The suspension tower 16 is provided with a mounting portion 16a to which a shock absorber is attached, and the end of the cross member 20 in the vehicle width direction is joined at a position adjacent to the mounting portion 16a. In this example, the upper end of the outer reinforcing member 22 of the cross member 20 is joined to the suspension tower 16 at a position continuous with the mounting portion 16a. This results in a structure in which the mounting portions 16a on both sides (left and right) in the vehicle width direction are connected by the cross member 20, improving the torsional rigidity of the vehicle body and further improving the rigidity of the mounting portion 16a. Furthermore, since the shock absorber to which vibration is input is connected to the cross member 20, it is possible to suppress vibration of the mounting portion 16a, and it is possible to suppress deformation of the rear floor panel 10 caused by a load being input to the bent portion 25 of the recess 11.

[0026] Moreover, the cross member 20 of this embodiment has a plurality of long straight portions and, as described above, bent portions 25 formed by bending the straight portions. In this example, the straight portions include an intermediate portion 21a, a vertical portion 21b, an outer portion 21c, a bottom portion 22a, and a vertical wall portion 22b. Furthermore, the bent portions 25 are provided at positions where these portions are connected.

[0027] In this embodiment, the thickness of the bent portion 25 is set to be thicker than the thickness of the straight portion. Here, the thickness may be the plate thickness of the bent portion 25 and the straight portion, or may be the distance between the surface joined to the vehicle body (e.g., the rear floor panel 10) and the surface on the inside of the vehicle (e.g., the upper surface of the middle portion 21a) when viewed in the front-rear direction of the vehicle. By setting the thickness of the bent portion 25 in this manner, it is possible to suppress bending deformation.

[0028] In this embodiment, as described above, a spare tire can be placed on the bottom surface 11a of the recess 11, and the cross member 20 installed on the bottom surface 11a is formed along the shape of the spare tire. In this example, this prevents the middle portion 21a of the cross member 20 from interfering with the spare tire when the spare tire is fixed to the bottom surface 11a, and makes it possible to stably fix the spare tire to the bottom surface 11a.

[0029] Moreover, in this embodiment, the cross member 20 is disposed in the center (middle portion) of the recess 11 in the vehicle longitudinal direction. This makes it possible to effectively improve the surface rigidity of the bottom surface portion 11a of the recess 11. Moreover, in this embodiment, the cross member 20 extends parallel to the rear skirt panel 12. Since the cross member 20 and the rear skirt panel 12 act as rigid members, it becomes possible to suppress deformation of the region between the rear skirt panel 12 and the cross member 20 in the vehicle longitudinal direction in the recess 11.

[0030] The description of the present embodiment is merely an example for explaining the present invention, and does not limit the invention described in the claims. Furthermore, the configuration of each part of the present invention is not limited to the above embodiment, and various modifications are possible within the technical scope described in the claims.

[0031] In this embodiment, the cross member 20 extends linearly in the vehicle width direction in top view as shown in FIG. 1, but is not limited thereto. For example, as shown in FIG. 6, the intermediate portion 21a may be bent or curved toward the vehicle front to provide a bent intermediate portion 21d, and the position where the outer end of the cross member 20 in the vehicle width direction is connected to the mounting portion 16a provided on the suspension tower 16 may be shifted slightly toward the vehicle front. This may be applied, for example, when the center position of the bottom portion 11a of the recess 11 and the position of the mounting portion 16a are misaligned in the vehicle front-rear direction. Note that, in FIG. 6, only the right side of the bent intermediate portion 21d is shown by virtual lines, but the left side can also be applied. [Explanation of symbols]

[0032] 10 Rear floor panel 10a top surface 11 Recess 11a Bottom part 11b Side wall part 12 Rear skirt panel 13 Rear side member 15 Rear wheel house panel 16 Suspension tower 16a Mounting part 17 Quarter Panel 18 Back door opening 20 Cross member 21 Central member 21a Middle part (straight part) 21b Vertical section (straight section) 21c Outside part (straight part) 21d Bend middle part 22 Outer reinforcement member 22a Bottom (straight part) 22b Vertical wall section (straight section) 25 Bend

Claims

1. a rear floor panel provided at a rear portion of a vehicle body; and suspension towers disposed on both sides of the rear floor panel in a vehicle width direction and surrounding shock absorbers extending in a vehicle up-down direction, In a vehicle rear structure, a recess is provided in a vehicle width direction intermediate portion of the rear floor panel, the recess being recessed toward a vehicle lower side, The recess has a bottom surface portion and a side wall portion extending from an end of the bottom surface portion toward the upper side of the vehicle and surrounding at least a portion of the bottom surface portion, An outer shape of a portion of the bottom surface of the recess that is closer to the front of the vehicle than a center in the vehicle front-rear direction is semicircular, A cross member extending in a vehicle width direction is provided in the recess at a middle portion of the recess in the vehicle front-rear direction and at a rear portion of the semicircular portion, The cross member has a plurality of long straight portions and a plurality of bent portions formed by bending the straight portions, The thickness of the bent portion is formed to be thicker than the thickness of the straight portion and the side wall portion, The end of the cross member in the vehicle width direction is connected to the suspension tower, A vehicle rear structure, wherein the cross member is provided on an upper surface side of the recess.

2. The suspension tower is provided with a mounting portion to which the shock absorber is attached, 2. The vehicle rear structure according to claim 1, wherein an end portion of the cross member in a vehicle width direction is joined to a position adjacent to the mounting portion.

3. A spare tire can be placed on the bottom surface of the front recess, 3. The vehicle rear structure according to claim 1, wherein the cross member has a portion joined to the upper surface of the bottom portion, the portion corresponding to a surface shape along a radial direction of the spare tire.

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