Vehicle lower body structure

Abstract

To provide a vehicle lower body structure that prevents deterioration of aerodynamic characteristics by an undercover member flash with a lower surface of a suspension link and providing a saved space by using the lower surface of the suspension link .SOLUTION: In a vehicle lower body structure in which a plurality of suspension links 27 to 31 included in a rear suspension device 20 are provided to extend from a lower position of a wheel house toward the inner side in a vehicle width direction, a pair of left and right first suspension links 27 of the suspension links 27 to 31 are formed in a cross-sectional U-shape with an upper surface opened, and a first undercover member 51 that covers a vehicle body lower surface while being flash with a lower surface of the first suspension link 27 is provided on a side portion of the first suspension link 27.SELECTED DRAWING: Figure 2

Description

[Technical Field]

[0001] The present invention relates to a vehicle underbody structure in which a plurality of sets of suspension links provided in a rear suspension device are arranged to extend inward in the vehicle width direction from positions below wheel houses. [Background technology]

[0002] Generally, a rear suspension device includes a plurality of sets of suspension links that extend inward in the vehicle width direction from below the wheelhouse. If the underfloor wind from below the vehicle body is drawn into the rear suspension device and its surrounding area, it will result in a deterioration of the aerodynamic characteristics. To solve this problem, as disclosed in Patent Document 1, an undercover is attached to the lower part of the suspension link, but this requires a relatively large undercover member to be attached to the lower part of the suspension link, which has problems in terms of weight and cost. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Publication No. 2019-177775 Summary of the Invention [Problem to be solved by the invention]

[0004] Therefore, an object of the present invention is to provide a vehicle lower body structure that can suppress deterioration of aerodynamic characteristics by using an under-cover member that is flush with the underside of the suspension link, thereby saving space and utilizing the underside of the suspension link. [Means for solving the problem]

[0005] The present invention relates to an underbody structure for a vehicle in which a plurality of sets of suspension links provided in a rear suspension device are arranged to extend inward in the vehicle width direction from below a wheelhouse, wherein one set of a pair of left and right first suspension links among the suspension links is configured to have a U-shaped cross section with an open upper surface, and a first undercover member is provided on the side of the first suspension link to cover the underside of the vehicle body while being flush with the underside of the first suspension link, another set of a pair of left and right second suspension links among the suspension links located further forward of the first suspension links are provided with a second undercover member that covers the underside of the vehicle body while being flush with the underside of the first suspension link, and a third undercover member that covers the underside of the vehicle body is provided at least on the inner side in the vehicle width direction of the second undercover member. The first under-cover member has a curved portion formed along the curvature of the lower surface of the first suspension link. The vehicle lower body structure is characterized by the above.

[0006] The above-mentioned rear suspension device may be a multi-link rear suspension device, and the above-mentioned first suspension link may be set as a lower lateral link.

[0007] According to this invention, the first under-cover member is flush with the underside of the first suspension link, and the space-saving first under-cover member makes effective use of the underside of the first suspension link, thereby suppressing deterioration of aerodynamic characteristics.

[0008] In other words, because the underside of the first suspension link is used as part of the under-cover section, the area of ​​the first under-cover member can be reduced accordingly, thereby saving space and preventing underfloor running wind from being drawn into the rear suspension device and its surrounding areas by the first under-cover member.

[0009] As described above, the other pair of left and right second suspension links, which are located further forward of the vehicle than the first suspension links, are provided with second under-cover members that cover the underside of the vehicle body and are flush with the undersides of the first suspension links.

[0010] The second suspension link may be set as a lower rear rail link in a multi-link rear suspension device. As a result, the second under-cover member and the first under-cover member positioned at the front and rear can further suppress deterioration of aerodynamic characteristics.

[0011] As described above, the third under-cover member that covers the underside of the vehicle body is provided at least on the inner side in the vehicle width direction of the second under-cover member. This, together with the first and second under-cover members, which are the other under-cover members, can further improve the effect of rectifying the underfloor running wind.

[0012] Also , As mentioned above, The first under-cover member has a curved portion formed along the curved shape of the lower surface of the first suspension link. There are . child Re As a result, the curved portion of the first under-cover member follows the curved shape of the underside of the first suspension link, ensuring a function of rectifying wind generated when traveling under the floor.

[0013] As an aspect of the present invention, a plurality of ribs may be provided on the lower surface of the second under-cover member, the ribs projecting downwardly of the vehicle and extending in the front-rear direction of the vehicle. According to this invention, the rib prevents underfloor traveling wind flowing from the front to the rear under the second under-cover member from escaping to the left and right in the vehicle width direction, thereby improving the rectifying effect. [Effects of the Invention]

[0014] According to this invention, by using an under-cover member that is flush with the underside of the suspension link, it is possible to suppress deterioration of aerodynamic characteristics with a space-saving under-cover member that utilizes the underside of the suspension link. [Brief explanation of the drawings]

[0015] [Figure 1] FIG. [Figure 2] FIG. 2 is a side view of the left side of the vehicle showing the lower body structure of the vehicle. [Figure 3] FIG. [Figure 4] FIG. [Figure 5] FIG. 3 is a perspective view of a main part showing the mounting structure of the first and second under-covers. [Figure 6] FIG. DETAILED DESCRIPTION OF THE INVENTION

[0016] The object of the present invention is to suppress deterioration of aerodynamic characteristics by using space-saving under-cover members that are flush with the undersides of the suspension links in an underbody structure for a vehicle in which a plurality of sets of suspension links provided in a rear suspension device are arranged to extend inward in the vehicle width direction from a position below a wheelhouse, wherein one set of a pair of left and right first suspension links among the suspension links is configured to have a U-shaped cross section with an open upper surface, and first under-cover members are provided on the sides of the first suspension links to cover the underside of the vehicle body while being flush with the undersides of the first suspension links, another set of a pair of left and right second suspension links among the suspension links is positioned further forward of the first suspension links, and second under-cover members are provided to cover the underside of the vehicle body while being flush with the undersides of the first suspension links, and a third under-cover member is provided at least on the inside in the vehicle width direction of the second under-cover members, also covering the underside of the vehicle body. The first under-cover member has a curved portion formed along the curvature of the lower surface of the first suspension link. This was achieved through the following configuration. [Example]

[0017] An embodiment of the present invention will be described in detail below with reference to the drawings. The drawings show the vehicle's underbody structure, with Fig. 1 being a bottom view of the vehicle's underbody structure, Fig. 2 being a side view of the left side of the vehicle showing the vehicle's underbody structure, and Fig. 3 being a rear view of the vehicle's underbody structure. Also, Fig. 4 is a perspective view of the rear suspension device, Fig. 5 is a perspective view of the main parts showing the mounting structure of the first and second undercovers, and Fig. 6 is a bottom perspective view of the second undercover.

[0018] In Figure 2, a kick-up section is provided that rises upward from the rear end of the front floor panel, and a rear floor panel 1 is provided at this kick-up section and extends rearward from the kick-up section. This rear floor panel 1 forms the floor surface of the passenger compartment and luggage compartment, and a rear seat pan 2 is integrally formed with the rear floor panel 1.

[0019] From the rear end of the rear floor panel 1 to the rear end of the front floor panel, rear side frames 3 having a two-piece front and rear structure extending in the longitudinal direction of the vehicle are provided on both left and right ends of these floor panels in the vehicle width direction.

[0020] Side sills (not shown) are provided that are continuous with the above-mentioned rear side frames 3 and extend forward of the vehicle, with the rear ends of the side sills overlapping the front ends of the rear side frames 3. Both the above-mentioned rear side frames 3 and side sills are vehicle body strength members.

[0021] On the other hand, as shown in FIGS. 1 to 3, a rear bumper 4 is attached to the rear of the vehicle in order to reduce the impact in the event of a rear-end collision. The rear bumper 4 is a resin injection-molded part attached along the lower rear edge of the vehicle. The rear bumper 4 covers the rear body structure, which is made up of the rear bumper reinforcement, the rear portion of the rear floor panel 1, the rear portions of the rear side frames 3, the rear end panel, etc., as well as the silencer 10, which will be described later, from the rear.

[0022] As shown in Figures 1 to 3, the rear bumper 4 has a main wall portion 4A that covers the middle portion of the rear body structure in the vehicle width direction, and side wall portions 4B that extend from the end portions of the main wall portion 4A in the vehicle width direction toward the front of the vehicle and cover the left and right corner portions of the rear body structure.

[0023] As shown in Figure 3, the main wall portion 4A of the rear bumper 4 is composed of an upper wall portion 5, a middle wall portion 6, and a lower wall portion 7. The upper end of the upper wall portion 5 is attached along the upper end of the rear end panel. The middle wall portion 6 extends in the vertical direction and the vehicle width direction, continuing from the lower part of the upper wall portion 5. The lower wall portion 7 extends in the vertical direction and the vehicle width direction, continuing from the lower part of the middle wall portion 6. The lower end portion 7a of the lower wall portion 7 is located rearward of the rear end panel in the fore-and-aft direction and lower than the rear floor panel 1 in the vertical direction.

[0024] The rear bumper 4 described above has a lower corner wall 4C that is continuous with the outer side of the lower wall portion 7 in the vehicle width direction and the lower part of the side wall portion 4B, and an opening 8 is formed in the rear surface of this lower corner wall 4C to release exhaust gases discharged from tailpipes 12, 13 (described later) to the rear of the vehicle.

[0025] The vehicle in this embodiment is a front-engine, rear-wheel drive (FR) vehicle, and therefore has a tunnel section 9 in the center of the front floor panel in the width direction, which extends in the longitudinal direction of the vehicle and protrudes into the passenger compartment (see Figure 1).

[0026] As shown in FIG. 1, a silencer 10 is provided at the front of the lower part of the rear bumper 4 as a noise suppressing device, and is disposed transversely so as to extend in the vehicle width direction. As shown in the figure, the silencer 10 has an inlet pipe 11 at the center of the front part in the vehicle width direction for introducing exhaust gas into the silencer 10, and tail pipes 12, 13 that are L-shaped when viewed from the bottom are provided on both left and right ends of the silencer 10 in the vehicle width direction, with rear end portions 12a, 13a of the tail pipes 12, 13 facing the opening 8 in the rear bumper 4. Also, as shown in Figures 1 to 3, the lower surface 10a of the silencer 10 is formed in a substantially flat shape.

[0027] A rear suspension device 20 that independently suspends left and right rear wheels (not shown) is provided below the pair of left and right rear side frames 3 (see FIG. 4). In this embodiment, a multi-link rear suspension is used as the rear suspension device 20.

[0028] As shown in Figure 4, the above-mentioned rear suspension device 20 includes a suspension cross member 24 (so-called subframe) that combines a front cross member 21, a rear cross member 22, and a pair of left and right side cross members 23, 23 in a well crib shape when viewed from above the vehicle.

[0029] The front cross member 21 connects the front sides of the pair of left and right side cross members 23, 23 in the vehicle width direction, and the rear cross member 22 connects the rear sides of the pair of left and right side cross members 23, 23 in the vehicle width direction.

[0030] The above-mentioned side cross member 23 extends in the fore-and-aft direction of the vehicle, and the portion of the side cross member 23 in front of the connection point with the front cross member 21 extends forward of the vehicle and outward in the vehicle width direction, and a vehicle body mounting member 25 is provided at the front end of the side cross member 23.

[0031] The side cross members 23 extend rearward and outward in the vehicle width direction from the connecting portion with the rear cross member 22, and a vehicle body mounting member 26 is provided at the rear end of the side cross members 23.

[0032] The multi-link rear suspension has five suspension links on each side. These five suspension links include three lower links located on the lower side and two upper links located on the upper side, and the five suspension links on each side connect the suspension cross member 24 to the wheel support member (not shown) of the rear wheel.

[0033] The three lower links located on the lower side include a lower lateral link 27, a toe control link 28 located rearward of the lower lateral link 27, and a lower rear rail link 29 located forward of the lower lateral link 27. The two upper links located on the upper side include an upper lateral link 30 and an upper trail link 31 located forward of the upper lateral link 30.

[0034] The lower lateral link 27 extends in the vehicle width direction from the attachment portion 32 towards the outside of the vehicle body, and an end portion 27a on the rear wheel side is connected to the wheel support member. The toe control link 28 extends from the mounting portion outward from the vehicle body at a forward incline, and an end portion 28a on the rear wheel side is connected to the wheel support member.

[0035] The lower rear rail link 29 extends from the attachment portion outward from the vehicle body at a rearward incline, and an end portion 29a on the rear wheel side is connected to the wheel support member. The upper link 30 extends from the mounting portion 33 outwardly of the vehicle body at a forward incline, and an end portion 30a on the rear wheel side is connected to a wheel support member. The upper trail link 31 extends from the mounting portion 34 outwardly of the vehicle body at a rearward incline, and an end portion 31a on the rear wheel side is connected to a wheel support member.

[0036] 2, the suspension cross member 24 is fixed to the lower part of the rear side frame 3 via front and rear body mounting members 25, 26. A mounting seat 35 is provided on the lower part of the rear side frame 3 that faces the front end body mounting member 25 in the vertical direction, and the body mounting member 25 at the front end of the suspension cross member 24 is fixed to the mounting seat 35.

[0037] The above-described rear suspension system 20 includes a suspension damper 36 . The suspension damper 36 includes a strut 37 and a coil spring stretched between the upper and lower seats. The upper end of the suspension damper 36 is attached to the rear side frame 3, and the lower end of the suspension damper 36 is attached to the lower lateral link 27.

[0038] That is, the multi-link rear suspension device 20 has a total of five sets of suspension links (a lower lateral link 27, a toe control link 28, a lower trail link 29, an upper lateral link 30, and an upper trail link 31), and each of these suspension links is arranged to extend inward in the vehicle width direction from a position below the wheelhouse.

[0039] As shown in FIG. 4, a stabilizer 40 is held at the rear of the side cross member 23 using a bracket 38 and a holder 39. The stabilizer 40 suppresses the roll angle (for example, when a vehicle turns a corner, the body tilts, and this tilt angle is called the roll angle) of only one wheel when bumping or rebounding due to the resistance of its torsional rigidity.

[0040] Furthermore, a bracket 41 is provided at the lower part of the front end of the vehicle body mounting member 25, extending forward from the lower part toward the outside of the vehicle. Of the above-mentioned suspension links (lower lateral link 27, toe control link 28, lower trail link 29, upper lateral link 30, upper trail link 31), lower lateral link 27, which serves as a pair of first suspension links on the left and right, is configured with a U-shaped cross section with an open top surface, as shown in FIG. 5.

[0041] In other words, as shown in Figure 5, the above-mentioned lower lateral link 27 is configured by connecting a front wall 27b, a bottom wall 27c (see Figure 2), and a rear wall 27d in a U-shaped cross section, and is provided with a flange portion 27e extending from the upper end of the front wall 27b toward the front of the vehicle, and a flange portion 27f extending from the upper end of the rear wall 27d toward the rear of the vehicle.

[0042] As shown in FIG. 5, upper wall members 27h having elongated holes 27g through which struts 37 of suspension dampers 36 are inserted are welded to front and rear flange portions 27e, 27f on the upper surface of lower lateral link 27. Upper wall members 27h improve the rigidity of lower lateral link 27 while allowing vertical displacement of lower lateral link 27.

[0043] As shown in Figures 1, 2 and 5, a first undercover member 51 is provided on the rear side of the lower lateral link 27, covering the underside of the vehicle body while being flush with the underside of the lower lateral link 27, i.e., the underside of the bottom wall 27c.

[0044] As a result, deterioration of aerodynamic characteristics is suppressed by the space-saving first under-cover member 51, which is flush with the underside of the lower lateral link 27 and makes effective use of the underside of the lower lateral link 27. In other words, by using the underside of the lower lateral link 27 as part of the under-cover section, the area of ​​the first under-cover member 51 is reduced accordingly, thereby achieving space savings and suppressing underfloor traveling wind from being drawn into the rear suspension unit 20 and its surrounding areas by the first under-cover member 51.

[0045] As shown in FIG. 5, the first undercover member 51 includes a bottom wall 51a, a plurality of truncated cone-shaped mounting seats 51b formed to protrude upward from the bottom wall 51a, and ribs 51c extending radially and connecting the outer peripheries of the mounting seats 51b to the bottom wall 51a.

[0046] Meanwhile, a plurality of mounting pieces 42 are integrally formed on the rear wall 27d of the lower lateral link 27. Then, the first under-cover member 51 is attached to the lower lateral link 27 by connecting and fixing the mounting seats 51b of the first under-cover member 51 to the mounting pieces 42 of the lower lateral link 27 using mounting members 43 such as bolts and nuts.

[0047] As shown in Figures 1 and 5, of the above-mentioned suspension links (lower lateral link 27, toe control link 28, lower rear rail link 29, upper lateral link 30, upper trail link 31), lower rear rail link 29, which serves as the other pair of left and right second suspension links located further forward of the vehicle than lower lateral link 27, is provided with a second undercover member 52 that covers the underside of the vehicle body and is flush with the underside of lower lateral link 27.

[0048] As a result, the second under-cover member 52 and the first under-cover member 51 positioned at the front and rear are configured to further suppress deterioration of the aerodynamic characteristics. As shown in FIG. 5, the second undercover member 52 includes a bottom wall 52a, a plurality of truncated cone-shaped mounting seats 52b formed to protrude upward from the bottom wall 52a, and ribs 52c extending radially and connecting the outer peripheries of the mounting seats 52b to the bottom wall 52a.

[0049] On the other hand, the lower rear rail link 29 is formed with an inverted U-shaped cross section, and multiple mounting pieces 44 extending in the front-to-rear direction are integrally formed from the lower ends of the front and rear walls of this lower rear rail link 29. Then, the second under-cover member 52 is attached to the lower rear rail link 29 by connecting and fixing the mounting seats 52b of the second under-cover member 52 to the mounting pieces 44 of the lower rear rail link 29 using mounting members 45 such as bolts and nuts.

[0050] Figure 6 is a perspective view of the underside of the second under-cover member 52. As shown in the figure, the underside of the second under-cover member 52 is provided with a plurality of ribs 52d that protrude downward from the vehicle and extend in the fore-and-aft direction of the vehicle, and are parallel to one another.

[0051] As a result, the above-mentioned multiple ribs 52d prevent the underfloor traveling wind flowing from the front to the rear under the second under-cover member 52 from escaping to the left and right in the vehicle width direction, thereby improving the streamlining effect and also increasing the rigidity of the second under-cover member 52 with the ribs 52d.

[0052] As shown in FIG. 1, a third under-cover member 53 that covers the underside of the vehicle body is provided on the vehicle width inner side of the second under-cover member 52, on the vehicle width inner side of the base end side of the front portion of the vehicle of the lower lateral link 27, and on the vehicle width inner side of the mounting portion 32 of the lower lateral link 27. This, together with the first and second under-cover members 51 and 52 which are the other under-cover members, further improves the effect of rectifying the underfloor running wind.

[0053] As shown in Figure 4, the above-mentioned third under-cover member 53 is supported on the suspension cross member 24 via a stay 46 located on the front lower part of the side cross member 23 of the suspension cross member 24, and a support bracket 47 located below the vehicle width direction end of the front cross member 21.

[0054] As shown in Figures 3 and 5, the underside of lower lateral link 27, which serves as the first suspension link, is provided with a curved portion 48 that protrudes downward from the free end thereof, and a curved portion 49 that protrudes upward from this curved portion 48 to the longitudinal middle portion of lower lateral link 27.

[0055] The bottom wall 51a of the above-mentioned first under-cover member 51 is provided with curved portions 54, 55 that follow the curved portions 48, 49 of the lower lateral link 27. As a result, the curved portions 54, 55 of the first under-cover member 51 follow the curved shape of the underside of the lower lateral link 27 serving as the first suspension link, ensuring a function of rectifying wind that flows under the floor when the vehicle is traveling.

[0056] As shown in FIG. 1, in the lower left side of the vehicle, a fourth under-cover member 56 is provided in front of the second and third under-cover members 52, 53, covering the underside of the vehicle body from the lower left end of the tunnel portion 9 in the vehicle width direction to the lower part of the side sill outer.

[0057] 1, a fifth under-cover member 57 is provided on the lower right side of the vehicle in front of the second and third under-cover members 52, 53. The fifth under-cover member 57 covers the underside of the vehicle body from the lower right end of the tunnel portion 9 in the vehicle width direction to the lower part of the side sill outer. The fourth and fifth under-cover members 56, 57 are each attached and supported by the body. In the figure, arrow F indicates the front of the vehicle, arrow R indicates the rear of the vehicle, arrow IN indicates the inside in the vehicle width direction, arrow OUT indicates the outside in the vehicle width direction, and arrow UP indicates the top of the vehicle.

[0058] As described above, the lower body structure of the vehicle in this embodiment is a lower body structure of a vehicle in which multiple sets of suspension links (see each link 27 to 31) provided in the rear suspension device 20 are arranged to extend inward in the vehicle width direction from a position below the wheelhouse, and among the suspension links (each link 27 to 31), one pair of left and right first suspension links (lower lateral links 27) is configured with a U-shaped cross section with an open upper surface, and is characterized in that a first undercover member 51 is provided at the rear side of the first suspension link (lower lateral link 27) so as to cover the underside of the vehicle body while being flush with the underside of the first suspension link (lower lateral link 27) (see Figures 1 to 4).

[0059] According to such a vehicle lower body structure, the first under-cover member 51 is flush with the underside of the first suspension link (lower lateral link 27), and the space-saving first under-cover member 51 makes effective use of the underside of the first suspension link (lower lateral link 27), thereby suppressing deterioration of aerodynamic characteristics.

[0060] In other words, since the underside of the first suspension link (lower lateral link 27) is used as part of the under-cover section, the area of ​​the first under-cover member 51 can be reduced accordingly, thereby saving space and preventing underfloor running wind from being drawn into the rear suspension device 20 and its surrounding areas by the first under-cover member 51.

[0061] In the above embodiment, the first undercover member 51 is provided at the rear side of the lower lateral link 27, but a structure in which it is provided at the front side of the lower lateral link 27 may also be adopted.

[0062] In addition, in the lower body structure of such a vehicle, among the suspension links (see each link 27 to 31), another pair of left and right second suspension links (lower rear rail links 29) located further forward of the vehicle than the first suspension link (lower lateral link 27) is provided with a second undercover member 52 that covers the underside of the vehicle body and is flush with the underside of the first suspension link (lower lateral link 27) (see Figures 1 and 2). According to such a vehicle underbody structure, the second under-cover member 52 and the first under-cover member 51 positioned at the front and rear can further suppress deterioration of the aerodynamic characteristics.

[0063] Furthermore, in this vehicle lower body structure, a third under-cover member 53 that covers the underside of the vehicle body is provided at least on the inner side in the vehicle width direction of the second under-cover member 52 (see FIG. 1). According to such a vehicle underbody structure, in combination with the first and second under-cover members 51, 52 which are other under-cover members, the effect of rectifying the underfloor running wind can be further improved.

[0064] Furthermore, in this vehicle lower body structure, the first under-cover member 51 is formed with curved portions 54, 55 in accordance with the curved shape of the underside of the first suspension link (lower lateral link 27) (see Figures 3 and 5).

[0065] According to such a vehicle underbody structure, the curved portions 54, 55 of the first under-cover member 51 follow the curved shape of the underside of the first suspension link (lower lateral link 27), thereby ensuring the function of rectifying wind while traveling under the floor.

[0066] Additionally, in this vehicle lower body structure, the lower surface of the second under-cover member 52 is provided with a plurality of ribs 52d that protrude downward and extend in the front-rear direction of the vehicle (see FIGS. 1 and 6). According to such a vehicle lower body structure, the rib 52d prevents the underfloor traveling wind that flows from the front to the rear under the second under-cover member 52 from escaping to the left and right in the vehicle width direction, thereby improving the streamlining effect.

[0067] In the configuration of this invention and the correspondence with the above-mentioned embodiment, The suspension links of this invention correspond to the lower lateral link 27, toe control link 28, lower trail link 29, upper lateral link 30, and upper trail link 31 of the embodiment. Similarly, A pair of left and right first suspension links corresponds to the lower lateral link 27, The other pair of left and right second suspension links corresponds to the lower rail link 29, The present invention is not limited to the configurations of the above-described embodiments.

[0068] For example, in the above embodiment, a multi-link rear suspension device 20 is shown as having a lower lateral link 27, a toe control link 28, a lower rear rail link 29, an upper lateral link 30, and an upper trail link 31, but the present invention can also be applied to the lower body structure of a vehicle having a double-wishbone rear suspension device that has a pair of left and right front lower arms, a pair of left and right rear lower arms, a pair of left and right front upper arms, a pair of left and right rear upper arms, and a pair of left and right control links. [Industrial Applicability]

[0069] As described above, the present invention is useful for a vehicle underbody structure in which a rear suspension device has multiple sets of suspension links that extend inward in the vehicle width direction from below a wheelhouse. [Explanation of symbols]

[0070] 20...Rear suspension device 27...Lower lateral link (first suspension link) 28...Toe control link (suspension link) 29...Lower rail link (second suspension link) 30...Upper lateral link (suspension link) 31...Upper trail link (suspension link) 51...First undercover member 52...Second undercover member 52d...Rib 53...Third undercover member 54,55...curvature part

Claims

1. A vehicle underbody structure in which a plurality of sets of suspension links provided in a rear suspension device are provided so as to extend inward in a vehicle width direction from below a wheel house, Among the suspension links, a pair of left and right first suspension links are configured to have a U-shaped cross section with an open upper surface, and a first undercover member is provided on a side of the first suspension link, the first undercover member being flush with a lower surface of the first suspension link and covering the lower surface of the vehicle body; Among the suspension links, another pair of left and right second suspension links located closer to the front of the vehicle than the first suspension links are provided with second undercover members that cover the underside of the vehicle body and are flush with undersides of the first suspension links, A third under-cover member is provided at least on the inner side of the second under-cover member in the vehicle width direction to cover the underside of the vehicle body, and a curvature portion is formed in the first under-cover member along the curvature shape of the underside of the first suspension link. The vehicle's underbody structure.

2. A plurality of ribs are provided on the underside of the second under-cover member, the ribs protruding downward from the vehicle and extending in the front-rear direction of the vehicle. The vehicle underbody structure according to claim 1 .

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