Vehicle underbody structure

Abstract

The design ensures that even if the underbody airflow over the front of the rear suspension area is disturbed due to gaps between the aerodynamic cover groups provided on the inner and outer sides in the vehicle width direction at the front of the rear suspension area, or due to changes in the height relationship of each aerodynamic cover group between the inner and outer sides in the vehicle width direction, the underbody airflow over the front of the rear suspension area is straightened. [Solution] The system comprises a rear suspension 10, a rear aerodynamic cover 42 positioned below the rear lower arm 14, and front aerodynamic covers (43, 44) positioned directly in front of the rear aerodynamic cover 42. The front aerodynamic covers (43, 44) are separated from each other by a gap wt in the vehicle width direction. The front of the bottom surface portion 142 of the rear arm under cover 42 is provided with a front rising bottom surface portion 147 that rises from a position lower than the lower end wtd of the gap wt, with a curved shape that rises further forward than the upper end wtu of the gap wt. The front rising bottom surface portion 147 is positioned in the area immediately behind the gap wt, at least over the entire area of ​​the gap wt in the vehicle width direction.

Description

Technical Field

[0001] This invention relates to a lower body structure of a vehicle, which includes a rear suspension that connects a wheel support member supporting a rear wheel to a vehicle body via a lower arm extending along the vehicle width direction, a rear aerodynamic cover disposed below the lower arm, and a front aerodynamic cover disposed immediately in front of the rear aerodynamic cover.

Background Art

[0002] As a lower body structure of a vehicle, not only a floor under cover but also a sub-frame and various arms provided in a rear suspension region (also referred to as a "rear sus region") located behind it under the vehicle floor are provided with aerodynamic covers so that the underfloor running wind flowing rearward along the underfloor of the vehicle during vehicle running is not disturbed in the rear sus region. Such a structure is becoming widespread.

[0003] For example, in Patent Document 1 below, regarding a lower body structure of a vehicle equipped with a five-link multi-link type rear suspension having five arms (links), as a front aerodynamic cover disposed below the front side of the rear sus region, it includes a front aerodynamic cover (52) on the outer side of the vehicle width and a front aerodynamic cover (53) on the inner side of the vehicle width.

[0004] The front aerodynamic cover (53) on the inner side of the vehicle width is basically stationary regardless of the load state of the vehicle body and the vertical movement of the rear wheels, while the front aerodynamic cover (52) on the outer side of the vehicle width varies vertically with the load state of the vehicle body and the vertical movement of the rear wheels. Therefore, they are individually set with a gap between them in the vehicle width direction below the front side of the rear sus region.

[0005] And in Patent Document 1, in order to ensure the aerodynamic characteristics on the front side of the rear sus region, a structure is disclosed in which the gap between two adjacent aerodynamic covers on each of the inner and outer sides in the vehicle width direction is made as small as possible, and the height of the bottom surface of each aerodynamic cover is made continuous in the vehicle width direction.

[0006] However, as described above, in Patent Document 1, simply minimizing the gap between two adjacent aerodynamic covers on the inner and outer sides in the vehicle width direction at the front of the rear suspension area, or aligning their heights, has limitations in addressing the problem of turbulent underbody airflow at the front of the rear suspension area, caused by changes in the height relationship between two adjacent aerodynamic covers on the inner and outer sides in the vehicle width direction, as described above.

[0007] Furthermore, the smaller the gap between the two aerodynamic covers in the vehicle width direction, the more likely they are to interfere with each other when the front aerodynamic cover (52) moves up and down, as described above. [Prior art documents] [Patent Documents]

[0008] [Patent Document 1] Japanese Patent Publication No. 2023-37116 [Overview of the project] [Problems that the invention aims to solve]

[0009] Therefore, the present invention aims to provide a vehicle underbody structure that can straighten the underbody airflow even when the underbody airflow flowing in front of the rear suspension area is disturbed due to gaps between the groups of aerodynamic covers provided on the inner and outer sides in the vehicle width direction in front of the rear suspension area, or due to changes in the height relationship of each of the groups of aerodynamic covers in the vehicle width direction in the inner and outer sides. [Means for solving the problem]

[0010] This invention relates to a lower body structure for a vehicle comprising: a rear suspension that connects a wheel support member supporting the rear wheel to the vehicle body via a front lower arm and a rear lower arm that extend along the vehicle width direction and are positioned front and rear with respect to the axle; a rear aerodynamic cover positioned below the rear lower arm; and a front aerodynamic cover positioned directly in front of the rear aerodynamic cover, wherein the front aerodynamic cover is positioned directly below the front lower arm and directly below the subframe located inward from the front lower arm in the vehicle width direction, separated from each other by a gap in the vehicle width direction; the bottom surface of the rear aerodynamic cover is provided with a front rising bottom surface that rises from a position lower than the lower end of the gap, becoming more curved towards the front and rising above the upper end of the gap; and the front rising bottom surface is positioned in the area immediately behind at least the entire area of ​​the gap in the vehicle width direction.

[0011] The gap refers to the space between opposing ends of front aerodynamic covers facing each other in the vehicle width direction. If the vertical height of the upper or lower ends of the opposing ends facing each other in the vehicle width direction differs between adjacent front aerodynamic covers, the lower end of the gap corresponds to the height of the bottom surface of the lower opposing end of the adjacent front aerodynamic covers, and the upper end of the gap corresponds to the height of the bottom surface of the higher opposing end of the adjacent front aerodynamic covers.

[0012] According to the above configuration, even if the underbody airflow flowing in front of the rear suspension area is disturbed due to the gaps between each of the front aerodynamic cover groups provided on the inner and outer sides in the vehicle width direction below the front of the rear suspension area, the underbody airflow can be straightened in the vehicle width direction by the rear aerodynamic cover immediately following it.

[0013] In an embodiment of this invention, the front aerodynamic cover comprises a front arm under cover positioned directly below the front lower arm and a subframe under cover positioned directly below the subframe, wherein the bottom surfaces of the opposing ends of the front arm under cover and the subframe under cover, which face each other in the vehicle width direction separated by the gap, are positioned at different heights, and the front rising bottom surface is positioned including the area immediately behind each of the opposing ends in the vehicle width direction, and may be configured to rise from a position lower than the bottom surface of the lower opposing end to a position higher than the bottom surface of the higher opposing end in the vehicle width direction.

[0014] According to the above configuration, even if the underbody airflow flowing in front of the rear suspension area is disturbed due to the difference in height between the opposing ends of the front arm under cover and the subframe under cover, which are separated by the gap, the underbody airflow can be straightened in the vehicle width direction by the front rising bottom surface of the rear aerodynamic cover immediately following it.

[0015] In another aspect of this invention, the front arm under cover may be positioned in a downward inclined position along the extending direction of the front lower arm, which is located lower and further outward in the vehicle width direction.

[0016] According to the above configuration, the front arm under cover can be positioned along the extending direction of the front lower arm, thereby minimizing the gap between the main surface of the arm under cover and the front lower arm, preventing damage and other problems, and further ensuring snow removal performance.

[0017] In another aspect of this invention, the lowest point of the bottom surface of the front arm under cover, which moves up and down in conjunction with the up and down movement of the front lower arm, may be set higher than the lowest point of the bottom surface of the rear arm under cover, which moves up and down in conjunction with the up and down movement of the rear lower arm.

[0018] According to the above configuration, when the vehicle is in a loaded state or when the vehicle is running, the subframe is basically stationary, while the front lower arm moves up and down. Therefore, the height relationship between the subframe under cover and the front arm under cover attached to them changes. However, even if the height relationship changes, the underfloor running air can be rectified in the vehicle width direction by the front rising bottom surface portion of the rear arm under cover immediately behind these two under covers.

[0019] As an aspect of this invention, the front rising bottom surface portion may be provided in the immediately following region including the entire vehicle width direction range across the front arm under cover, the subframe under cover, and the gap between them. <s

[0020] According to the above configuration, even if the underfloor running air flowing through the front side of the rear suspension region is disturbed due to the presence of the gap between the front arm under cover and the subframe under cover as the front aerodynamic cover group provided on the inner and outer sides in the vehicle width direction on the front side of the rear suspension region, and the change in the height relationship of each of them, the underfloor running air can be rectified in the vehicle width direction.

Effect of the Invention

[0021] According to this invention, it is possible to provide a lower vehicle body structure that can rectify the underfloor running air even if the underfloor running air flowing through the front side of the rear suspension region is disturbed due to the presence of a gap between the aerodynamic cover groups provided on the inner and outer sides in the vehicle width direction on the front side of the rear suspension region, and the change in the height relationship of each aerodynamic cover group in the inner and outer sides in the vehicle width direction.

Brief Description of the Drawings

[0022] [Figure 1] External view of the left side of the rear part of the vehicle body equipped with the lower vehicle body structure of the present embodiment, viewed from the right, below, and rear [Figure 2] Bottom view showing the main part of the lower vehicle body structure of the present embodiment [Figure 3] External view of the left side of the rear part of the vehicle body in FIG. 1, viewed from the left, above, and rear [Figure 4]Plan view showing the main part on the left side of the rear of the vehicle body in FIG. 1 [Figure 5] Front view showing the main part on the left side of the rear of the vehicle body in FIG. 1 [Figure 6] Left side view showing the main part on the left side of the rear of the vehicle body in FIG. 1 [Figure 7] Rear view showing the main part on the left side of the rear of the vehicle body in FIG. 1 [Figure 8] Cross-sectional view showing the main part of the lower vehicle body structure corresponding to the line A-A in FIG. 4 [Figure 9] Cross-sectional view showing the main part of the lower vehicle body structure corresponding to the line B-B in FIG. 4 [Figure 10] Cross-sectional view seen from the front with respect to the cross-section of the main part along the line C-C in FIG. 4 [Figure 11] Cross-sectional view seen from the front with respect to the cross-section of the main part along the line D-D in FIG. 4 [Figure 12] Perspective view of the rear under cover seen from the front, left, and below [Figure 13] Perspective view of the rear under cover seen from the rear, left, and above [Figure 14] Explanation diagram of the action of the lower vehicle body structure of the present embodiment when the underfloor running air flows along the vehicle body underfloor

Mode for Carrying Out the Invention

[0023] Hereinafter, an embodiment of the present invention will be described based on the drawings. In the drawings, arrow F indicates the front of the vehicle body, arrow U indicates the upper part of the vehicle body, arrow W indicates the vehicle width direction, arrow Rh indicates the right direction of the vehicle body, and arrow Lh indicates the left direction of the vehicle body, respectively. Also, the left and right directions of the vehicle body are based on the occupant sitting in the driver's seat. Furthermore, since the lower part of the vehicle body in the vehicle of the present embodiment has a substantially left-right symmetric shape, hereinafter, it will be mainly described based on the lower part of the vehicle body on the left side of the vehicle body. [[ID= forty-one]] [[ID= forty-two]]

[0024] [[ID= forty-three]] As shown in Figure 1, the lower part of the vehicle of this embodiment to which the lower body structure of the present invention is applied includes a front floor panel 1 that forms the floor surface of the passenger compartment, and a rear floor panel 3 that is connected to the rear end of the front floor panel 1 via a kick-up portion (not shown) and extends to the rear of the vehicle. The rear floor panel 3 forms the floor surface of the rear of the passenger compartment and the cargo compartment, and a rear seat pan 3a is integrally formed with it.

[0025] As shown in Figures 1 to 4, rear side frames 4, which have a closed cross-sectional space extending in the longitudinal direction of the vehicle as part of the vehicle body frame, are provided on both sides of the rear floor panel 3. Further outward in the vehicle width direction from the pair of left and right rear side frames 4 are the rear wheels 5. Hubs 5a (see Figure 2, etc.) are fixed to the wheels of the rear wheels 5.

[0026] As shown in Figures 3 and 4, the rear suspension 10 that suspends the rear wheels 5 is attached to the rear side frame 4 (see Figure 1) via a suspension cross member 30 (hereinafter referred to as "subframe 30"). Note that, in drawings other than Figures 1 and 4, the vehicle body other than the subframe 30 is omitted.

[0027] As shown in Figures 3 to 7, the rear suspension 10 employs a so-called E-type multi-link suspension system. It comprises a wheel support member 11 (knuckle) that rotatably supports the hub 5a fixed to the rear wheel 5, a trailing arm 12 as a longitudinal arm extending forward from the wheel support member 11 with its front end attached to the vehicle body, three width-direction arms 13, 14, and 15 extending inward from the wheel support member 11 with their inner ends attached to the subframe 30, a coil spring 16 and a damper 17 as shock-absorbing members with their upper ends attached to the vehicle body, and a stabilizer link 18 (see Figures 3 and 4) for stabilizing the vehicle body.

[0028] As shown in Figure 3, the three width-direction arms 13, 14, and 15 are: an upper arm 13 positioned forward of the axle W5 of the rear wheel 5 so as to be able to support the upper part of the wheel support member 11 from the subframe 30; a rear lower arm 14 positioned behind the axle W5 so as to be able to support the rear lower part of the wheel support member 11; and a front lower arm 15 positioned forward of the axle so as to be able to support the lower part of the wheel support member 11.

[0029] Of the three width-direction arms 13, 14, and 15, the front lower arm 15 includes, as shown in Figure 3, an inner lower arm shaft 15wa in the width-direction that is supported by the front lower arm support portion 35 at the front lower part of the subframe 30, and, as shown in Figure 6, an outer lower arm shaft 15wb in the width-direction that is connected to the arm connecting portion 11f at the front lower part of the wheel support member 11.

[0030] As shown in Figure 5, the front lower arm 15 is positioned in an inclined position, with the outer side in the vehicle width direction being lower, and is configured to swing vertically with the lower arm shaft 15wa, located at the inner end in the vehicle width direction, as the pivot point.

[0031] As shown in Figure 7, the rear lower arm 14 includes a lower arm shaft 14wa that is on the inside in the vehicle width direction and is supported by the rear lower arm support portion 34 at the lower rear of the subframe 30, and a lower arm shaft 14wb that is on the outside in the vehicle width direction and is connected to the arm connecting portion 11r at the lower rear of the wheel support member 11.

[0032] As shown in Figure 7, the rear lower arm 14 is positioned in an inclined position, with the outer side in the vehicle width direction being lower, and is configured to swing vertically with the lower arm shaft 14wa, located at the inner end in the vehicle width direction, as the pivot point.

[0033] As shown in Figures 2 and 3, the rear lower arm 14 is larger than the front lower arm 15, with longer lengths in the vehicle width direction, vertical direction, and longitudinal direction. As a result, the lowest point of the bottom surface portion 14b (see Figure 7) of the rear lower arm 14, which moves up and down around the lower arm shaft 14wa as a pivot point, is located lower in the corresponding parts in the vehicle width direction than the lowest point of the bottom surface portion 151 (see Figure 5) of the front lower arm 15, which moves up and down around the lower arm shaft 15wa as a pivot point.

[0034] As shown in Figures 2 and 3, the rear lower arm 14 gradually increases in front-to-back width from the inner and outer ends (14wa, 14wb) in the vehicle width direction (longitudinal direction) toward the center, and a large-diameter section 14a is provided in the center in the vehicle width direction (longitudinal direction).

[0035] As shown in Figures 8 to 11, the rear lower arm 14 has a bottom surface portion 14b, a front wall portion 14c that rises vertically from the front end of the bottom surface portion 14b, a front edge flange portion 14d that protrudes forward from the upper end of the front wall portion 14c, a rear wall portion 14e that rises vertically from the rear end of the bottom surface portion 14b, and a rear edge flange portion 14f that protrudes rearward from the upper end of the rear wall portion 14e, and the cross-sectional shape perpendicular to the vehicle width direction is formed in an upwardly open hat shape.

[0036] As shown in Figure 10, a spring seat 26 that supports the lower end of the coil spring 16 is integrally formed on the bottom surface 14b of the large diameter portion 14a of the rear lower arm 14. As shown in Figures 4 to 7, a spring seat 27 is also provided above the spring seat 26 (see Figure 10) of the rear lower arm 14 on the rear side frame 4 (see Figure 1), which serves as the vehicle body frame. This spring seat 27 faces downwards and supports the upper end of the coil spring 16. The coil spring 16 is interposed between the spring seat 27 on the vehicle body and the spring seat 26 on the rear lower arm 14.

[0037] As shown in Figures 3, 4, 8, 10, and 11, reinforcements 18a and 18b are attached and fixed to the inner and outer sides in the vehicle width direction of the rear lower arm 14, avoiding the large diameter portion 14a. Both of these reinforcements 18a and 18b are provided to connect the front wall portion 14c and the rear wall portion 14e so as to close the upper opening of the rear lower arm 14, which has an open-top hat-shaped cross-section.

[0038] As shown in Figures 3, 4, and 6-9, the rear lower arm 14 is provided with locking pieces 19 on both sides of the large-diameter portion 14a in the vehicle width direction of the rear wall portion 14e, for locking and fixing the rear arm under cover 42, which will be described later and is located below the rear lower arm 14. Both the left and right locking pieces 19 extend rearward from the rear wall portion 14e, and their base ends are integrally attached to the rear wall portion 14e by welding. At the tip, there is a grommet insertion hole 19a (see Figure 3) for locking to the rear arm under cover 42 via a grommet G, which is a resin locking member, and a bolt insertion hole 19b (see Figure 3) for fastening to the rear arm under cover 42 via a bolt B and nut N, which are fastening members, both located along the vehicle width direction.

[0039] As shown in Figures 1 to 5 and Figure 7, the subframe 30 is located inward in the vehicle width direction from the left and right rear suspensions 10, and mainly comprises front and rear cross members 31 that are spaced apart from each other in the vehicle's longitudinal direction and run along the vehicle's width direction, and left and right side members 32 that are spaced apart from each other on each side and run along the longitudinal direction. These multiple members 31 and 32 are assembled in a grid-like pattern in plan view to form a single unit.

[0040] The subframe 30 supports the widthwise inner ends of the vehicle width direction arms 13, 14, and 15. Regarding the support of the front lower arm 15 and the rear lower arm 14 among the vehicle width direction arms 13, 14, and 15, as shown in Figures 3 to 5, a front lower arm support portion 35 is provided at the lower outer end of the front cross member 31 of the subframe 30, supporting the lower arm shaft 15wa of the front lower arm 15. Similarly, a rear lower arm support portion 34 is provided at the lower outer end of the rear cross member 31, supporting the lower arm shaft 14wa of the rear lower arm 14, as shown in Figures 2 and 7.

[0041] As shown in Figures 2 to 7, the front and rear ends of the left and right side members 32 of the subframe 30 are each provided with vehicle body mounting parts 36 that are attached to the mounting points on the front and rear sides of the left and right rear side frames 4 on the vehicle body side. Furthermore, the rear suspension 10 and subframe 30 described above are configured to be approximately symmetrical with respect to a center line that extends in the front-rear direction along the middle of the vehicle body in the width direction (see Figure 2).

[0042] Furthermore, as shown in Figures 1 to 4, the vehicle of this embodiment is equipped with a floor under cover 41 located below the front floor panel 1 under the vehicle body floor, and suspension under covers 42, 43, and 44 located below the rear suspension 10. Both the floor under cover 41 and the suspension under covers 42, 43, and 44 function as aerodynamic covers, forming a rectifying surface for the underbody airflow.

[0043] As shown in Figures 1 to 5, the suspension undercovers 42, 43, and 44 include a rear arm undercover 42 positioned below the rear lower arm 14 of the rear suspension 10, a front arm undercover 43 positioned directly in front of the rear arm undercover 42 and below the front lower arm 15, the front arm undercover 43 having a bottom surface 151 higher than the bottom surface 14b of the rear lower arm 14, and a subframe undercover 44 positioned directly below the subframe 30.

[0044] As shown in Figure 5, the subframe under cover 44 and the front arm under cover 43 are positioned in front of the rear suspension region, directly in front of the rear arm under cover 42, and are separated from each other by a gap wt in the vehicle width direction, on the inner and outer sides in the vehicle width direction (see the enlarged area of ​​region Z in Figure 5 in particular).

[0045] As described above, the subframe under cover 44 has its bottom surface 144 positioned approximately horizontally along the vehicle width direction, whereas the front arm under cover 43 is set so that its inner end is the highest in the vehicle width direction, and is positioned in a downward-sloping posture, with the outer side in the vehicle width direction being lower.

[0046] As shown in the enlarged area of ​​region Z in Figure 5, the inner end 43t in the vehicle width direction of the front arm under cover 43 and the outer end 44t in the vehicle width direction of the subframe under cover 44 face each other in the vehicle width direction separated by the gap wt. However, the bottom surfaces 143t and 144t of these inner and outer ends 43t and 44t in the vehicle width direction are positioned at different heights. In this example, the bottom surface 143t of the inner end 43t of the front arm under cover 43 is positioned higher than the bottom surface 144t of the outer end 44t of the subframe under cover 44.

[0047] Furthermore, as shown in Figure 8, the front arm under cover 43 is attached to the front lower arm 15 via a bracket 60, and is formed as a flat plate with plate thickness in the vertical direction for almost its entire length except for the front part, and is positioned directly behind the rear end of the floor under cover 41 with a gap in the front-rear direction.

[0048] The front portion of the front arm under cover 43 is formed in a curved shape that curves upward towards the front. As a result, while the bottom surface 143 of the front arm under cover 43 is formed to be substantially flat in the front-to-back direction except for the front portion, the front portion is provided with a curved, rising bottom surface 143a that rises towards the front.

[0049] As shown in Figures 5 and 8, the front arm under cover 43 is positioned in a downward inclined position along the extending direction of the front lower arm 15, which is located lower towards the outer side in the vehicle width direction. Accordingly, the bottom surface portion 143, which serves as a rectifying surface, is positioned inclined linearly so that it is located lower towards the outer side in the vehicle width direction.

[0050] For example, as shown in Figure 8, the bottom surface 143 of the front arm under cover 43 is set at a position higher than the imaginary straight line La that connects the bottom surface 141 of the floor under cover 41 and the bottom surface 142 of the rear arm under cover 42 (more specifically, the bottom surface 146 of the flat plate portion 46) in the front-to-back direction, across the entire width of the vehicle.

[0051] As shown in Figure 5, the front arm under cover 43, which is fixed to the front lower arm 15, has its bottom surface 143 positioned above the bottom surface 142 of the rear arm under cover 42, which is fixed to the larger rear lower arm 14, throughout its entire width direction, even when the vehicle is loaded or in motion.

[0052] For example, when the vehicle is in motion, the front arm under cover 43, which is fixed to the front lower arm 15, swings up and down as the front lower arm 15 swings up and down. On the other hand, the rear arm under cover 42, which is fixed to the rear lower arm 14, swings up and down as the rear lower arm 14 swings up and down. Even in such cases, the lowest point of the bottom surface 143 of the vertically moving front arm under cover 43 is set higher in the corresponding parts in the vehicle width direction than the lowest point of the bottom surface 142 of the vertically moving rear arm under cover 42.

[0053] As shown in Figures 3, 4, and 8, the bracket 60 of the front arm under cover 43 is integrally formed in a plate shape with a roughly rectangular shape in plan view, consisting of an arm holding portion 61 which is curved upward in a projection shape when viewed from the side of the vehicle so as to embrace the front lower arm 15 from above, a front edge portion 62 which is aligned in the vehicle width direction at the front end of the arm holding portion 61, and a rear edge portion 63 which is aligned in the vehicle width direction at the rear end of the arm holding portion 61.

[0054] The bracket 60 is attached to the upper surface of the front arm under cover 43 at mounting points located at the four corners in a plan view, using mounting members, with the front edge 62 and rear edge 63 of the bracket 60 embracing the front lower arm 15 from above by the arm holding portion 61.

[0055] In this embodiment, as shown in Figure 8, of the mounting locations at each of the four corners of the rectangular bracket 60 in plan view, the two mounting locations located at both ends of one diagonal are formed with mounting holes 64a that can be fastened with bolts B and nuts N as mounting members, while the two mounting locations located at both ends of the other diagonal are formed with mounting holes 64b that can be locked with resin locking members, i.e., grommets G, as mounting members.

[0056] On the other hand, as shown in Figure 8, mounting holes 38a and 38b are formed vertically through the upper surface of the front arm under cover 43 at locations corresponding to the four mounting holes 64a and 64b of the bracket 60 in a plan view.

[0057] As shown in Figures 5 and 9, the subframe under cover 44 is attached to the subframe 30 via a bracket 70, and is formed in a substantially flat shape with a plate thickness in the vertical direction for almost its entire length, and is positioned substantially horizontally immediately behind the rear end of the floor under cover 41 with a gap in the front-rear direction.

[0058] As shown in Figure 5, the subframe under cover 44 has a length in the vehicle width direction that allows it to be positioned directly below the area extending from the outer side in the vehicle width direction of the front cross member 31 of the subframe 30 to the inner side of the vehicle width of the front lower arm 15.

[0059] As shown in Figures 5 and 9, the bracket 70 of the subframe under cover 44 comprises a bottom portion 71 attached to the upper surface of the subframe under cover 44 using bolts B, and left and right vertical wall portions 72 rising upward from both sides of the bottom portion 71, forming a gate-like shape that opens upward when viewed from the front. The upper ends of the left and right vertical wall portions 72 of the bracket 70 are integrally attached to the lower surface of the outer end in the vehicle width direction of the front cross member 31 by welding or the like.

[0060] As shown in Figures 1 to 4 and Figures 6 to 13, the rear arm under cover 42 is formed by resin molding so as to be generally symmetrical with respect to the cover center line in the vehicle's longitudinal direction, which passes through the midpoint of the rear arm under cover 42 in the vehicle's width direction.

[0061] As shown in Figures 6 and 8 to 12, the rear arm under cover 42 comprises a flat plate portion 46 positioned substantially horizontally below the rear lower arm 14 and a front curved portion 47 that forms an upward-sloping curved shape at the front of the rear arm under cover 42. That is, as shown in Figures 8 to 11, the rear arm under cover 42 extends continuously in the vertical and front-rear directions from the front upper side of the rear lower arm 14, through below the bottom portion 14b, to the rear lower side.

[0062] The flat plate portion 46 covers the bottom surface portion 14b of the rear lower arm 14 from below and protrudes rearward from the rear wall portion 14e of the rear lower arm 14. The flat plate portion 46 is formed in a substantially flat shape with a length in the vehicle width direction that covers the portion of the rear lower arm 14 from directly below over the entire length in the vehicle width direction, excluding the lower arm shafts 14wa and 14wb on both the inner and outer sides in the vehicle width direction. Furthermore, as shown in Figures 2, 6 to 8, 11, and 13, the flat plate portion 46 is formed to be attachable to locking pieces 19 provided on both the left and right sides of the rear of the rear lower arm 14 via grommets G, bolts B, and nuts N.

[0063] More specifically, as shown in Figures 12 and 13, the flat plate portion 46 has a grommet insertion hole 48a (see Figures 3 and 6) that communicates vertically with the grommet insertion hole 19a (see Figures 3, 6, 8, 9, and 11) in the locking piece portion 19, and a bolt insertion hole 48b that communicates vertically with the bolt insertion hole 19b in the locking piece portion 19. The flat plate portion 46 and the locking piece portion 19 are locked together by grommets G inserted into the grommet insertion holes 19a and 48a of both, and fastened together by bolts B and nuts N inserted into the bolt insertion holes 19b and 48b of both.

[0064] As shown in Figure 12, the front curved portion 47 has a front rising bottom portion 147 that extends smoothly forward from the bottom portion 146 of the flat plate portion 46 in the vehicle width direction and gradually rises upward towards the front.

[0065] As shown in Figure 8, the front rising bottom portion 147 rises from a position lower than the bottom portion 143 of the front arm under cover 43 and the bottom portion 141 of the floor under cover 41, and rises in a curved shape towards the front, reaching a position higher than the bottom portion 143 of the front arm under cover 43.

[0066] Furthermore, as shown in Figure 5, the front rising bottom portion 147 rises from a position lower than the lower end wtd of the gap wt, with a curved shape as it moves forward, and is positioned in the area immediately behind at least the entire area of ​​the gap wt in the vehicle width direction.

[0067] Here, as shown in the enlarged area of ​​region Z in Figure 5, the height of the lower end wtd of the gap wt corresponds to the height of the bottom surface 144t of the opposing end 44t on the lower side. On the other hand, the height of the upper end wtu of the gap wt corresponds to the height of the actual bottom surface 143t of the opposing end 43t on the higher side.

[0068] More specifically, as shown in Figure 5, the front rising bottom portion 147 rises along the vehicle width direction, including the area immediately behind each of the opposing ends 43t and 44t in the vehicle width direction, from a position lower than the bottom portion 144t of the lower opposing end 44t to a position higher than the bottom portion 143t of the higher opposing end 43t.

[0069] In this example, as shown in Figures 2 and 5, the front rising bottom portion 147 is positioned over the entire area in the vehicle width direction of the area immediately behind the subframe under cover 44, excluding the inner portion in the vehicle width direction, and the front arm under cover 43, including the gap wt between them.

[0070] Furthermore, as shown in Figures 12 and 13, the front curved surface portion 47 has a front edge 47f formed in a straight line along the vehicle width direction along its entire length in the vehicle width direction, and comprises a front curved central portion 47a located in the center in the vehicle width direction, and front curved outer portions 47b located on both the left and right sides thereof. The upper part 47U of the front curved central portion 47a is formed to protrude above the front edge 47f located at the front upper edge of the front curved outer portions 47b on both the left and right sides.

[0071] As shown in Figures 8, 10, and 11, the upper part 47U of the central part 47a of the front curved surface is provided with a hook portion 49 that protrudes backward and hooks onto the front edge flange portion 14d of the rear lower arm 14 from the front and above, and works in cooperation with the locking piece portion 19 to fix it to the rear lower arm 14.

[0072] As shown in Figures 10 to 13, the hook portion 49 is formed such that the entire upper edge portion 49a of the upper part 47U of the central part 47a of the front curved surface, which is aligned in the vehicle width direction, and the entire left and right side edges 49b, which are aligned in the vertical direction, both protrude to the rear. On both the left and right sides of the upper edge 49a of the upper part 47U of the central part 47a of the front curved surface, forward-projecting pieces 49c are formed that protrude further forward than other parts at the upper end (see Figures 11 and 13). The left and right side edges 49b of the front curved surface 47 are formed in a forward-concave shape so that the front edge flange portion 14d of the rear lower arm 14 can be fitted into them, as shown in Figures 8, 10, and 11.

[0073] As shown in Figures 3 and 4, the hook portion 49 is provided at a location that coincides with the vehicle width direction of the large-diameter portion 14a of the rear lower arm 14, which has a spring seat 26 for receiving the spring. Therefore, the hook portion 49 is hooked onto the leading edge flange portion 14d of the large-diameter portion 14a. As shown in Figure 8, the locking pieces 19 provided on both sides of the rear wall portion 14e of the rear lower arm 14 are provided on both the left and right sides relative to the hook portion 49 in the vehicle width direction.

[0074] Furthermore, as shown in Figures 11 to 13, hollow sections 50 are provided on both the left and right sides of the rear arm under cover 42. The left and right hollow sections 50 each consist of the front curved outer section 47b which forms the front wall, the front vertical wall section 51 which forms the rear wall, and the upper wall section 52 which forms the upper wall, and have a hollow section 50s (closed cross-sectional space) inside that is aligned with the vehicle width direction.

[0075] The front vertical wall portion 51 rises upward from the rear (base) of the front curved outer portion 47b, which has a forward-sloping curved shape, in the direction upward of the vehicle. The upper wall portion 52 is formed in a horizontal plane. As a result, the hollow portion 50s inside the front vertical wall portion 51 has a roughly triangular cross-section perpendicular to the vehicle width direction. Furthermore, as shown in Figure 13, on both the left and right sides, the hollow forming portions 50 are provided spaced apart outward in the vehicle width direction from the front curved central portion 47a, while the upper wall portion 52 extends in the vehicle width direction to the lower end of the side edge portion 49b of the upper part 47U of the front curved central portion 47a, and are integrally formed with each other.

[0076] As shown in Figures 8 and 11, the rear end portion 52r of the upper wall portion 52 that extends horizontally in the front-rear direction on the front curved outer portion 47b of the rear arm under cover 42 is positioned near the front of the upper end of the front wall portion 14c of the rear lower arm 14, with the lower surface of the front edge flange portion 14d abutting against its upper surface from above. This vertical and front-rear alignment between the front curved outer portion 47b and the rear arm under cover 42 is formed along the vehicle width direction of the upper wall portion 52 (in this example, over approximately the entire length of the left and right front curved outer portions 47b in the vehicle width direction).

[0077] As a result, the rear arm under cover 42 is configured such that the front curved surface 47 is firmly supported from the rear side against impacts from the front by the front wall portion 14c, which minimizes the gap between the front and rear ends of the upper wall portion 52 and the rear end ends 52r of the front curved outer portion 47b, with the front edge flange portion 14d pressing down from above.

[0078] Furthermore, as shown in Figure 13, multiple reinforcing ribs 551 and 552 are provided on the surface of the rear arm under cover 42 facing the rear lower arm 14, i.e., the upper surface. The ribs 551 and 552 consist of longitudinal ribs 551 that run along the longitudinal direction and widthwise ribs 552 that run along the vehicle width direction.

[0079] The longitudinal ribs 551 are arranged at intervals from each other in the vehicle width direction, and further, extending outward from the center of the rear arm under cover 42 in the vehicle width direction, there are longitudinal inner ribs 551a, longitudinal intermediate ribs 551b, and longitudinal outer ribs 551c.

[0080] The longitudinal inner ribs 551a are formed in pairs on the left and right sides at the central part 47a of the front curved surface. The longitudinal intermediate ribs 551b are arranged in parallel with a gap in the vehicle width direction between the hollow forming part 50 and the central part 47a of the front curved surface, and their upper ends are joined to the upper wall part 52. The longitudinal outer ribs 551c are formed at the front part up to the front longitudinal wall part 51. Furthermore, the longitudinal outer ribs 551c are formed at the rear part from the front curved surface part 47 to the rear end of the rear arm under cover 42, and both sides are connected in the vehicle width direction by the vehicle width direction ribs 552.

[0081] Next, we will explain, using Figure 8, the function of the underbody airflow w, which is rectified along the bottom surface 141 of the floor under cover 41 during vehicle operation and then separated from the rear end of the floor under cover 41, as it passes under the rear suspension 10.

[0082] A gap in the front-to-back direction is maintained between the rear end of the bottom surface 141 of the floor under cover 41 and the front end of the bottom surface 143 of the front arm under cover 43. As a result, the underfloor airflow w that separates from the rear end of the floor under cover 41 is gradually diffused vertically as it passes through this gap (see arrow w1 in Figure 8). Note that Figure 8 only shows the upward turbulent portions w1 to w3 of the turbulent portions that have been diffused from the main stream of underfloor airflow w.

[0083] Furthermore, in this embodiment, as shown in Figure 8, the bottom surface 143 of the front arm under cover 43 is set at a position higher than the imaginary straight line La that connects the bottom surface 141 of the floor under cover 41 and the bottom surface 142 of the rear arm under cover 42 (specifically, the bottom surface 146 of the flat plate portion 46) in the front-to-back direction, over the entire width of the vehicle.

[0084] Thus, the bottom surface 143 of the front arm under cover 43 is arranged in a stepped manner relative to the bottom surface 141 of the floor under cover 41 and the bottom surface 142 of the rear arm under cover 42, and therefore there is a vertical gap between it and the virtual straight line La. In this example, the virtual straight line La is defined as the straight line connecting the rear end of the bottom surface 141 of the floor under cover 41 and the front end of the bottom surface 146 of the flat plate portion 46.

[0085] Furthermore, as shown in Figure 5, the front arm under cover 43 is inclined to correspond to the front lower arm 15, such that the height of the bottom surface 14b is higher towards the inside than towards the outside in the vehicle width direction. Therefore, the vertical gap between the bottom surface 143 of the front arm under cover 43 and the virtual straight line La is larger towards the inside than towards the outside in the vehicle width direction. In other words, although the vertical gap between the bottom surface 143 of the front arm under cover 43 and the virtual straight line La is small at the cross-sectional position shown in Figure 8, it becomes larger towards the inside in the vehicle width direction.

[0086] Therefore, the underfloor airflow w passing directly beneath the front arm under cover 43 does not receive sufficient rectification from the front arm under cover 43, and as shown in the turbulent portion w2 in Figure 8, it diffuses upward towards the rear. Furthermore, when the underfloor airflow w passes under the gap in the front-rear direction between the rear end of the bottom surface portion 143 of the front arm under cover 43 and the front end of the bottom surface portion 142 of the rear arm under cover 42, no rectification effect is obtained, and as shown in the turbulent portion w3 in Figure 8, it diffuses further upward towards the rear.

[0087] Thus, even if the underfloor airflow w is disturbed due to discontinuities in the front-to-rear direction or steps in the vertical direction between the floor under cover 41 and the rear arm under cover 42, as shown in Figure 8, the underfloor airflow w, including the disturbed portions w1, w2, and w3 that are turbulent relative to the main stream, can be smoothly directed from the front to the front rising bottom surface 147 of the rear arm under cover 42 and released towards the rear.

[0088] In other words, the underfloor airflow w that flows smoothly backward to adhere along the bottom surface 141 of the floor under cover 41 can be detached from the rear end of the floor under cover 41, reattached to the front rising bottom surface 147 of the rear arm under cover 42, and then flow smoothly backward along the substantially horizontal bottom surface 146 of the rear flat plate portion 46.

[0089] Furthermore, as shown in Figure 14, of the underfloor airflow w that separates from the rear end of the floor under cover 41 and flows backward, the underfloor airflow wi (hereinafter referred to as "inside underfloor airflow wi") that flows on the inside of the vehicle body in the vehicle width direction, i.e., directly below the subframe under cover 44, has a faster flow velocity in the main stream flowing backward than the underfloor airflow wo (hereinafter referred to as "outside underfloor airflow wo") that flows on the outside of the vehicle body in the vehicle width direction, i.e., directly below the front arm under cover 43, and is therefore less prone to turbulence.

[0090] Furthermore, since the subframe under cover 44 is positioned lower in height than the inner portion of the front arm under cover 43 in the vehicle width direction, the vertical step difference between it and the adjacent under covers 41 and 42 at the front and rear is small. Therefore, as shown in Figure 14, the turbulent portion wit of the underfloor airflow wi on the inner side of the vehicle width is smaller and less pronounced compared to the turbulent portion wot of the underfloor airflow wo on the outer side of the vehicle width. In other words, the underfloor airflow wi on the inner side of the vehicle width can flow more smoothly with less turbulence compared to the underfloor airflow wo on the outer side of the vehicle width that flows directly beneath the front arm under cover 43.

[0091] Furthermore, as shown in Figure 14, in the underfloor airflow wm (hereinafter referred to as "underfloor airflow wm in the middle of the vehicle width") that passes directly beneath the gap wt between the front arm under cover 43 and the subframe under cover 44 in the vehicle width direction, a turbulent vortex portion wmt is likely to occur due to being pulled upward through the gap wt. In contrast, in this embodiment, the front rising bottom surface portion 147 of the rear arm under cover 42 is positioned to face forward immediately after the gap wt. As described above, the underfloor airflow wm that has passed directly beneath the gap wt can be straightened by adhering to the front rising bottom surface portion 147 of the rear arm under cover 42 from the front, including the turbulent portion wmt relative to its main flow.

[0092] In short, the underfloor airflow wi on the inside of the vehicle width, the underfloor airflow wm in the middle of the vehicle width, and the underfloor airflow wo on the outside of the vehicle width, even if turbulence occurs as they pass under the floor in front of the rear suspension area, can be straightened by adhering to the front rising bottom surface 147 of the rear arm under cover 42 located immediately afterward, and then flowing smoothly to the rear.

[0093] As shown in Figures 1 to 7, the lower body structure of the vehicle in this embodiment described above includes a rear suspension 10 that connects a wheel support member 11 supporting the rear wheel 5 to the vehicle body via a front lower arm 15 and a rear lower arm 14 that extend along the vehicle width direction and are positioned front and rear with respect to the axle W5, a rear arm under cover 42 which serves as a rear aerodynamic cover positioned below the rear lower arm 14, and a front aerodynamic cover (43, 44) positioned directly in front of the rear arm under cover 42.

[0094] Furthermore, as shown in Figures 1 to 5, the front aerodynamic cover (43, 44) comprises a front arm under cover 43 directly below the front lower arm 15 and a subframe under cover 44 directly below the subframe 30, which is located inward in the vehicle width direction from the front lower arm 15.

[0095] As shown in Figure 5, the components are arranged separately from each other with a gap wt in the vehicle width direction. The front of the bottom surface portion 142 of the rear arm under cover 42 is provided with a front rising bottom surface portion 147 that rises from a position lower than the lower end wtd of the gap wt, and is curved towards the front, rising from the upper end wtu of the gap wt. The front rising bottom surface portion 147 is located in the area immediately behind the gap wt, at least over the entire area of ​​the gap wt in the vehicle width direction.

[0096] According to the above configuration, a gap wt is secured between each of the multiple front aerodynamic covers (43, 44) provided on the inner and outer sides in the vehicle width direction on the front side of the rear suspension area, that is, between each of the front aerodynamic cover groups (43, 44), while ensuring a gap wt to avoid interference with each other. Even if the underbody airflow passing below the front side of the rear suspension area toward the rear is disturbed due to securing the gap wt, the disturbance can be straightened in the vehicle width direction by the rear arm under cover 42 immediately following it.

[0097] More specifically, in the underbody area at the front of the rear suspension region, the subframe 30 is basically stationary when the vehicle is loaded or when the vehicle is in motion, while the front lower arm 15 moves up and down. Taking this into consideration, multiple front aerodynamic covers are individually arranged along the width direction of the vehicle. However, this results in discontinuous gaps wt in the width direction between the multiple front aerodynamic covers (43, 44).

[0098] As a result, the underbody airflow that flows rearward along the floor under cover 41 and separates from the floor under cover 41 may be greatly disturbed as it passes through the gap wt under the front of the rear suspension area (see Figure 14).

[0099] In contrast, as described above, the rear arm under cover 42 is provided with a front rising bottom surface portion 147 at the front of the bottom surface portion 142 of the rear arm under cover 42, which rises in a curved shape from a position lower than the lower end wtd of the gap wt to the front of the upper end wtu of the gap wt. Since the front rising bottom surface portion 147 is positioned in the area immediately behind at least the entire area of ​​the gap wt in the vehicle width direction, the underfloor airflow that is disturbed due to passing through the gap wt can be reliably reattached to the front rising bottom surface portion 147 of the rear arm under cover 42, and the reattached underfloor airflow can be smoothly rectified and flowed along the bottom surface portion 142 of the rear arm under cover 42 from the front rising bottom surface portion 147 in the vehicle width direction.

[0100] Therefore, while a gap wt is secured between each of the front aerodynamic cover groups (43, 44) provided on the inner and outer sides in the vehicle width direction on the front side of the rear suspension area to avoid interference with each other, even if the underbody airflow passing rearward below the front side of the rear suspension area is disturbed due to securing the gap wt, the disturbance can be straightened in the vehicle width direction by the rear arm under cover 42 immediately following it.

[0101] In one aspect of this invention, as shown in Figure 5, the front aerodynamic cover (43, 44) comprises a front arm under cover 43 positioned directly below the front lower arm 15 and a subframe under cover 44 positioned directly below the subframe 30.

[0102] Furthermore, the front arm under cover 43 and the subframe under cover 44 have their respective opposing ends 43t and 44t facing each other in the vehicle width direction across the gap wt, with the bottom surfaces 143t and 144t positioned at different heights.

[0103] Furthermore, the front rising bottom portion 147 is positioned to include the area immediately behind each of the opposing ends 43t and 44t in the vehicle width direction, and is configured to rise along the vehicle width direction from a position lower than the bottom portion 144t of the lower opposing end 44t to a position higher than the bottom portion 143t of the higher opposing end 43t.

[0104] According to the above configuration, even if the underbody airflow passing towards the rear is disturbed below the front of the rear suspension area due to the difference in height between the opposing ends 43t and 44t of the front arm under cover 43 and the subframe under cover 44, which are separated by a gap wt, the disturbance can be straightened in the vehicle width direction by the front rising bottom surface 147 of the rear arm under cover 42 immediately following it.

[0105] In one aspect of this invention, as shown in Figure 5, the front arm under cover 43 is positioned in a downward inclined position along the extending direction of the front lower arm 15, which is located lower towards the outer side in the vehicle width direction.

[0106] According to the above configuration, the front arm under cover 43 can be positioned along the extending direction of the front lower arm 15. This minimizes the vertical separation between the main surface of the front arm under cover 43 and the front lower arm 15, thereby enhancing the protective performance of the front arm under cover 43 against chipping and other damage, and further ensuring snow removal capabilities.

[0107] In one aspect of this invention, as shown in Figure 5, the lowest point of the bottom surface 143 of the front arm under cover 43, which moves up and down in conjunction with the up and down movement of the front lower arm 15, is set to be higher than the lowest point of the bottom surface 142 of the rear arm under cover 42, which moves up and down in conjunction with the up and down movement of the rear lower arm 14.

[0108] According to the above configuration, when the vehicle is loaded or when the vehicle is in motion, the subframe 30 is basically immobile, while the front lower arm 15 moves up and down. As a result, the height relationship between the front arm under cover 43 and the subframe under cover 44 changes, and the difference in height of the bottom surfaces 14b of both under covers 43 and 44 can become significant.

[0109] Furthermore, the underfloor airflow passing beneath these two undercovers 43 and 44 may be disturbed due to the difference in height between the two undercovers 43 and 44. However, even in such cases, the front rising bottom portion 147 of the rear arm undercover 42 immediately behind the two undercovers 43 and 44 can straighten the underfloor airflow across the vehicle width.

[0110] In the correspondence between the configuration of this invention and the embodiments described above, the rear aerodynamic cover corresponds to the rear arm under cover 42. However, this invention is not limited to the configuration of the embodiments described above, and many other embodiments can be obtained.

[0111] For example, in this embodiment, two undercovers, a front arm undercover 43 and a subframe undercover 44, are provided under the floor in front of the rear suspension area, and are arranged with a gap wt between them in the vehicle width direction. However, the present invention is not limited to this, and three or more undercover members may be arranged with gaps between them along the vehicle width direction.

[0112] Furthermore, in this embodiment, as shown in Figures 2 and 5, the front rising bottom portion 147 is positioned over the entire area in the vehicle width direction of the area immediately behind the subframe under cover 44, excluding the inner portion in the vehicle width direction, and the front arm under cover 43, including the gap wt between them. However, the present invention is not limited to this configuration.

[0113] For example, the front rising bottom portion 147 may be provided over the entire area in the vehicle width direction, extending from the front arm under cover 43 and the subframe under cover 44 to the area immediately behind the gap wt between them.

[0114] According to the above configuration, the front arm under cover 43 and subframe under cover 44, which are a group of front aerodynamic covers provided on the inner and outer sides in the vehicle width direction on the front side of the rear suspension area, have a gap wt between them, and even if the underbody airflow differs between the inner and outer sides in the vehicle width direction due to changes in their respective height relationships, the underbody airflow can be straightened across the vehicle width direction. [Explanation of symbols]

[0115] 5…Rear wheel 10…Rear suspension 11...Wheel support member 15…Front lower arm 14…Rear lower arm 30…Subframe 42...Rear arm under cover (rear aerodynamic cover) 43…Front arm under cover (front aerodynamic cover) 44…Subframe under cover (front aerodynamic cover) 43t, 44t…opposite end 44t...the opposite end on the lower side 43t...the opposite end on the taller side 142...Bottom surface of the rear arm under cover 143...Bottom surface of the front arm under cover 143t, 144t... Bottom surface of opposite ends 143t...Bottom surface of the opposite end on the taller side 144t...Bottom surface of the opposite end on the lower side 147... Front rising bottom section W5...Axle wt... gap wtd... lower end of the gap wtu... upper edge of the gap

Claims

1. A rear suspension system that connects a wheel support member that supports the rear wheel to the vehicle body via a front lower arm and a rear lower arm that extend along the width direction of the vehicle and are positioned front to rear of the axle, A rear aerodynamic cover positioned below the aforementioned rear lower arm, A lower body structure of a vehicle comprising a front aerodynamic cover positioned directly in front of the rear aerodynamic cover, The front aerodynamic cover is positioned directly below the front lower arm and directly below the subframe located inward from the front lower arm in the vehicle width direction, separated from each other by a gap in the vehicle width direction. The bottom surface of the rear aerodynamic cover is provided with a front rising bottom surface that is curved from a position lower than the lower end of the gap and rises higher than the upper end of the gap towards the front. The aforementioned front rising bottom portion is positioned in the area immediately behind the gap, at least over the entire area in the vehicle width direction. The lower body structure of the vehicle.

2. The front aerodynamic cover comprises a front arm under cover positioned directly below the front lower arm and a subframe under cover positioned directly below the subframe. The front arm under cover and the subframe under cover are positioned such that the bottom surfaces of their respective opposing ends, which face each other in the vehicle width direction with the gap between them, are at different heights. The aforementioned front rising bottom portion is positioned to include the area immediately behind each of the opposing ends in the vehicle width direction, and is configured to rise from a position lower than the bottom portion of the lower opposing end to a position higher than the bottom portion of the higher opposing end in the vehicle width direction. The lower body structure of the vehicle according to claim 1.

3. The aforementioned front arm under cover is positioned in a downward inclined position along the extending direction of the front lower arm, which is located lower towards the outside in the vehicle width direction. The lower body structure of the vehicle according to claim 2.

4. The lowest point of the bottom surface of the front arm under cover, which moves up and down in conjunction with the up and down movement of the front lower arm, is set to be higher than the lowest point of the bottom surface of the rear arm under cover, which moves up and down in conjunction with the up and down movement of the rear lower arm. The lower body structure of the vehicle according to claim 2.

5. The aforementioned front rising bottom portion is, The area immediately behind the front arm under cover and the subframe under cover, including the entire area in the vehicle width direction, extending to the gap between them, is provided. The lower body structure of the vehicle according to claim 2.

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