Lower body structure

Abstract

The present invention provides a vehicle body lower structure, which can avoid the load of snow and the like when snow and the like infiltrate the lower cover to prevent the lower cover from being damaged. The vehicle body lower structure is provided with an undercover (7) covering a portion of a trailing arm (5) from below. The undercover (7) has a front cover portion (71) extending from the front of the trailing arm (5) to a position covering the front portion (51) of the trailing arm (5), and a rear cover portion (72) extending continuously toward the rear from the center portion in the vehicle width direction of the rear end portion (71a) of the front cover portion (71). The undercover (7) is fixed to the vehicle body (1) by a first fastening portion (73a) arranged in front of the rear end portion (71a) and arranged on the outside in the vehicle width direction compared to the trailing arm (5), and a second fastening portion (73b) arranged in the rear of the first fastening portion (73a) and arranged on the inside in the vehicle width direction compared to the trailing arm (5).

Description

Technical Field

[0001] The invention relates to a vehicle body lower structure. Background Art

[0002] Generally, a part of a pair of left and right trailing arms of the rear suspension and a lower surface of the vehicle body in front of the rear suspension are covered by an undercover (also called a floor undercover) (for example, see Patent Document 1).

[0003] The vehicle body lower surface structure described in Patent Document 1 includes a flat front floor undercover (46) and a rear floor undercover (47) for rectifying, which cover the lower surface of the vehicle body except for the tunnel portion. The rear floor undercover (47) is arranged below the trailing arm (51). The floor undercover (47) has a rear extension portion (47E) which is continuous with the front portion of the rear suspension (50) and extends to below the torsion beam (52).

[0004] The rear end portion (47b) of the extension portion (47E) is fixed at a flange portion (47c) formed at the rear end portion (47b) to a bracket (60) hanging from the corresponding rear bottom plate (23) by means of a bracket (29).

[0005] Prior art literature

[0006] Patent Literature

[0007] Patent Document 1: Japanese Patent Application Publication No. 2019-182320 (see Figure 2 and Figure 4 ) Summary of the invention

[0008] Problems to be solved by the invention

[0009] However, in the vehicle body lower surface structure described in Patent Document 1, the floor undercover (47) is fixed to the lower surface of the rear floor panel (23) by means of a bracket (29) and a bracket (60) extending in the up-down direction.

[0010] Therefore, during driving, snow, ice, water, stones, gravel, mud, foreign matter, etc. (hereinafter referred to as "snow, etc.") may enter the floor under cover (47) or snow, etc. may adhere to the trailing arm (51) itself. In this case, the floor under cover (47) may be subjected to the load of the snow, etc., and may be unable to avoid the load and may be broken or damaged.

[0011] Therefore, an object of the present invention is to provide a vehicle body lower structure capable of avoiding the load of snow or the like when snow or the like intrudes into the under cover and preventing the under cover from being damaged.

[0012] Means for solving problems

[0013] The vehicle body lower structure of the present invention includes an undercover that covers a portion of the trailing arm from below, the undercover comprising: a front cover portion that extends from the front of the trailing arm to a position covering the front portion of the trailing arm; and a rear cover portion that extends continuously toward the rear from the center portion in the vehicle width direction of the rear end portion of the front cover portion, the undercover being fixed to the vehicle body by a first fastening portion and a second fastening portion, wherein the first fastening portion is arranged in front of the rear end portion and is arranged on the outside in the vehicle width direction compared to the trailing arm, and the second fastening portion is arranged in the rear of the first fastening portion and is arranged on the inside in the vehicle width direction compared to the trailing arm.

[0014] Effects of the Invention

[0015] According to the present invention, it is possible to provide a vehicle body lower structure capable of avoiding the load of snow or the like when snow or the like enters the under cover and preventing the under cover from being damaged. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a bottom view of a main part of a vehicle body showing an example of a vehicle body lower structure according to an embodiment of the present invention.

[0017] Figure 2 It is a schematic enlarged left side view of the main parts showing the installation state of the trailing arm and the undercover.

[0018] Figure 3 It is an enlarged bottom view showing the bottom cover and the heat insulating portion.

[0019] Figure 4 It is an enlarged plan view showing the bottom cover and the heat insulating portion.

[0020] Figure 5 It is an enlarged exploded perspective view of the bottom cover.

[0021] Figure 6 This is an enlarged exploded perspective view of the main part of the bottom cover.

[0022] Figure 7 It is an enlarged perspective view of a main part showing the installation state of the bottom cover.

[0023] Figure 8 It is an enlarged side view showing the bottom cover and the heat insulating portion.

[0024] Fig. 9 It is an enlarged side view showing a main part of the bottom cover.

[0025] Description of Reference Numerals

[0026] 1 Body

[0027] 5 Trailing arm

[0028] 7 Bottom cover

[0029] 7a Upper surface

[0030] 7b Lower surface

[0031] 7c 1st rib

[0032] 7d 2nd rib

[0033] 51 front part

[0034] 71a First rear end portion (rear end portion)

[0035] 71 Front cover

[0036] 72 rear cover

[0037] 73a First fastening part

[0038] 73b Second fastening part

[0039] 75 hood bottom

[0040] 76 Cover rear wall

[0041] 77 Wall

[0042] 78 hood side wall

[0043] 79 Side wall flange

[0044] H1 Height of the side wall of the hood

[0045] H2 Height of the rear wall of the hood

[0046] H3 Height of the first fastening part

[0047] H4 Height of the second fastening part DETAILED DESCRIPTION

[0048] Reference Figures 1 to 9 A vehicle body lower structure according to an embodiment of the present invention will be described.

[0049] It should be noted that the description is given with the traveling direction of the vehicle C being “front”, the backward direction being “rear”, the vertically upper side being “up”, the vertically lower side being “down”, and the vehicle width directions being “left” and “right”.

[0050] The vehicle body lower structure of the vehicle C is configured to be substantially symmetrical with respect to the left and right lines.

[0051] In the following, one of the left side and the right side of the vehicle C will be described, and the description of the other side will be appropriately omitted.

[0052] "vehicle"

[0053] First, before describing the vehicle body understructure according to the embodiment of the present invention, an example of a vehicle C to which the present invention is applied will be described.

[0054] like Figure 1 As shown, the vehicle C is, for example, an automobile having an undercover 7 on a vehicle body lower portion 1b, and its form and type are not particularly limited. Hereinafter, the present invention will be described by taking a family car as an example of the vehicle C.

[0055] Car Body

[0056] like Figure 1 As shown, the vehicle body 1 is used to form the entire vehicle C. Figure 1 or Figure 2 As shown, the vehicle body 1 mainly includes a metal vehicle body frame such as a side sill 11 , a rear side frame 12 , and a rear pillar 13 , a metal vehicle body panel such as a rear fender 14 and a rear wheel housing 15 , and a resin bumper exterior member 16 .

[0057] Lower body structure

[0058] The vehicle body lower structure is configured to include an undercover 7. In addition, a heat insulating portion 8 (also referred to as a "floor heat insulation plate"), an undercover 7, a suspension device 2, a suspension arm cover 4, a lower side sill 11, a rear side frame 12, a rear wheel housing 15, etc. are arranged in a vehicle body lower portion 1b of the vehicle body rear portion 1a. These components of the vehicle body lower portion 1b are arranged in pairs extending in the front-rear direction or transversely and are arranged approximately symmetrically.

[0059] As described above, the vehicle body lower portion 1 b is substantially bilaterally symmetrical, and therefore, the left side of the vehicle body 1 will be mainly described below, and the description of the right side of the vehicle body 1 will be appropriately omitted.

[0060] <Lower longitudinal beam>

[0061] Figure 1 or Figure 2 The lower side sill 11 shown is a hollow frame member extending from the lower end of the rear pillar 13 in the front-rear direction of the vehicle body to the lower end of the front pillar (not shown) and having a substantially U-shaped shape (a shape forming a closed cross section) when viewed in a longitudinal section. The lower side sill 11 is composed of a lower side sill inner member arranged on the inner side of the vehicle body and having a substantially U-shaped shape when viewed in a longitudinal section, and a lower side sill outer member arranged on the outer side of the vehicle body and having a substantially U-shaped shape when viewed in a longitudinal section, joined to form a closed cross section.

[0062] <Insulation section>

[0063] The heat insulating portion 8 is a heat insulating material provided along an exhaust pipe (not shown) that guides exhaust gas to the rear of the vehicle. The heat insulating portion 8 is provided along the front-rear direction at a substantially central portion of the under cover 7 in the vehicle width direction.

[0064] Bottom cover

[0065] like Figure 1 As shown in FIG. 1 , the under cover 7 is a member that covers the fuel tank (not shown) and a part of the trailing arm 5 from below. The under cover 7 is configured to include a left under cover 7A that is mounted between the heat insulating portion 8 and the left side sill 11, and a right under cover 7B that is mounted between the heat insulating portion 8 and the right side sill 11. In this way, the under cover 7 is divided into two left and right parts by the heat insulating portion 8.

[0066] It should be noted that the heat insulating portion 8 may not be provided. Therefore, the undercover 7 may be an integral structure, rather than being divided into the left undercover 7A and the right undercover 7B.

[0067] like Figure 3 As shown, the bottom cover 7 has: a substantially rectangular front cover portion 71 disposed on the front side; and a substantially hexagonal rear cover portion 72, which is formed in such a way that the width in the left-right direction decreases from the rear end of the front cover portion 71 toward the rear. The outer portions of the front cover portion 71 and the rear cover portion 72 in the vehicle width direction are formed in a symmetrical manner. The bottom cover 7 has a large number of small holes for drainage arranged in a grid shape at appropriate intervals.

[0068] like Figure 4 and Figure 5 As shown, the upper surface 7a of the bottom cover 7 is integrally formed with a first rib 7c, a second rib 7d, a concave-convex portion 7e, a rear flange portion 74, a cover rear wall portion 76, a convex portion 77, a cover side wall portion 78 and a side wall flange portion 79 for reinforcement.

[0069] The first rib 7c is composed of a plurality of reinforcing ribs extending in the vehicle width direction. The second rib 7d is composed of a plurality of reinforcing ribs extending in a direction (front-rear direction) orthogonal to the plurality of first ribs 7c. The first rib 7c and the second rib 7d are formed at appropriate intervals on the front cover portion 71 and the rear cover portion 72, and are arranged in a lattice shape. The concave-convex portion 7e is composed of a plurality of convex portions and concave portions formed at appropriate intervals in the left-right direction on the front end portions of the front cover portion 71 and the rear cover portion 72. Therefore, the cover bottom portion 75 is reinforced by the first rib 7c, the second rib 7d and the concave-convex portion 7e and is difficult to bend.

[0070] like Figure 1 or Figure 3 As shown, the under cover 7 is fixed to a rearward position of the lower surface of the vehicle body 1 by means of a first fastening portion 73a, a second fastening portion 73b, a third fastening portion 73c, and a fourth fastening portion 73d.

[0071] <Front cover>

[0072] like Figure 3 As shown, the front cover portion 71 extends from the front side of the trailing arm 5 to a first rear end portion 71a (rear end portion) disposed at a position covering the front portion 51 of the trailing arm 5. Figure 5As shown, the front cover portion 71 is formed with a first rib 7c, a second rib 7d, a concave-convex portion 7e, a first fastening portion 73a, a third fastening portion 73c, a fourth fastening portion 73d, a cover bottom portion 75, a cover rear wall portion 76, a convex portion 77, a cover side wall portion 78 and a side wall flange portion 79.

[0073] It should be noted that the first fastening portion 73a, the third fastening portion 73c, and the fourth fastening portion 73d will be described in detail later.

[0074] <Rear cover>

[0075] like Figure 3 As shown in FIG. 1 , the rear cover portion 72 continuously extends rearward from the center portion in the vehicle width direction of the first rear end portion 71a to the second rear end portion 72b. Figure 5 As shown, the rear cover portion 72 includes a first rib portion 7c, a second rib portion 7d, a second fastening portion 73b, a fourth fastening portion 73d, a rear flange portion 74, and a cover bottom portion 75.

[0076] <Rear flange>

[0077] The rear flange portion 74 is a portion for reinforcing the rear outer peripheral portion of the rear cover portion 72. The rear flange portion 74 is a wall formed by bending the peripheral edge portions of the rear ends of the left undercover 7A and the right undercover 7B upward.

[0078] like Figure 3 As shown in FIG. 1 , the cover bottom portion 75 has a lower surface 7b facing the road surface. The cover bottom portion 75 is configured such that the lower surface 7b of the left under cover 7A and the lower surface 7b of the right under cover 7B are arranged horizontally.

[0079] <Hood rear wall>

[0080] like Figure 5 and Figure 7 As shown, the rear wall portion 76 of the hood is a wall used to prevent snow and the like from intruding into the bottom hood 7 (the upper side of the bottom hood 7) when driving. The rear wall portion 76 of the hood is composed of a protruding piece that protrudes upward from the first rear end portion 71a of the hood bottom portion 75 of the left bottom hood 7A and the right bottom hood 7B, close to the outer side in the vehicle width direction. The rear wall portion 76 of the hood is formed from the rear end of the hood side wall portion 78 extending in the front-to-rear direction to the inner side in the vehicle width direction, and is formed in an L shape relative to the hood side wall portion 78 when viewed from above. Therefore, the rear wall portion 76 of the hood can reinforce the first rear end portion 71a. As shown in FIG. Figure 7 As shown in FIG. 1 , the cover rear wall portion 76 is disposed on the outer side in the vehicle width direction relative to the trailing arm 5. Fig. 9 As shown, the height H2 of the cover rear wall portion 76 is formed to be lower than the height H1 of the cover side wall portion 78 .

[0081] <Hood side wall>

[0082] The cover side wall portion 78 is composed of a wall that is erected upward in the range from the front end portion of the front cover portion 71 of the left bottom cover 7A and the right bottom cover 7B on the vehicle width direction to the first rear end portion 71a. The cover side wall portion 78 is formed in a manner that gradually rises from the front end portion to the rear end portion side, and the portion close to the first rear end portion 71a is formed horizontally and is the highest. The rear end portion of the cover side wall portion 78 extending in the front-back direction is connected to the outer end portion of the cover rear wall portion 76 in the vehicle width direction. A reinforcement convex portion 77 that protrudes toward the cover bottom portion 75 is formed at the inner center portion of the cover side wall portion 78 in the vehicle width direction.

[0083] <Side wall flange>

[0084] The side wall flange portion 79 is formed by bending horizontally from the upper end of the cover side wall portion 78 toward the outer side in the vehicle width direction on the left bottom cover 7A and the right bottom cover 7B, and is formed into an inverted L shape when viewed in a longitudinal section. The third fastening portion 73c is provided at the front end of the side wall flange portion 79, and the first fastening portion 73a is provided near the rear end. Figure 5 and Fig. 9 As shown, the upper surface of the side wall flange portion 79 has a gently inclined surface 79a that descends toward the front side, an inclined surface 79b that descends toward the front side, and a substantially horizontal horizontal surface 79c from the front side to the rear side. The first fastening portion 73a is provided on the inclined surface 79b.

[0085] <First fastening section>

[0086] like Figure 5 As shown, the first fastening portion 73a, the second fastening portion 73b, the third fastening portion 73c and the fourth fastening portion 73d are locations where bolts or other fasteners are installed for fixing the undercover 7 (the left undercover 7A and the right undercover 7B) to the vehicle body 1. The first fastening portion 73a is provided at a position close to the rear end of the side wall flange portion 79 in the left undercover 7A and the right undercover 7B. Therefore, the first fastening portion 73a is arranged forward of the first rear end portion 71a and is provided outside in the vehicle width direction compared to the trailing arm 5. Fig. 9 As shown in FIG. 1 , the height H3 of the first fastening portion 73a is arranged at a position lower than the height H4 of the second fastening portion 73b.

[0087] <Second fastening part>

[0088] like Figure 5 As shown in FIG. 1 , the second fastening portion 73b is provided at the top end of a protrusion 73b1 that protrudes upward from the cover bottom 75 to be higher than a horizontal surface 79c of the side wall flange portion 79 at the highest position. A reinforcing rib 73b2 is formed in a bent state in the range from a position close to the upper end to the lower end on the front and rear side surfaces of the protrusion 73b1. Therefore, the protrusion 73b1 is formed in a U-shape when viewed in a transverse section and is reinforced.

[0089] like Figure 3 and Figure 4 As shown in FIG. 1 , a notch 72 a is formed on the front side of the second fastening portion 73 b and is formed in a groove shape (U-shape) toward the inside in the vehicle width direction in a plan view.

[0090] like Figure 7 As shown in FIG. 1 , the second fastening portion 73b is arranged rearward of the first fastening portion 73a in the left undercover 7A and the right undercover 7B, and is arranged inward in the vehicle width direction compared to the trailing arm 5. Figure 3 and Figure 7 As shown in FIG. 1 , a line connecting the first fastening portion 73a and the second fastening portion 73b is defined as a curve L1 (imaginary line). The rear end of the cover rear wall portion 76, the rear end of the cover side wall portion 78, and the rear end of the side wall flange portion 79 located outside the curve L1 in the vehicle width direction are not fixed to the vehicle body 1 by a fixing member or the like, and therefore are relatively easy to bend downward (in the direction of arrow a) with the curve L1 as the center. Therefore, when snow or the like enters the under cover 7, the cover rear wall portion 76 can be bent in a downwardly inclined manner, so that the snow or the like can be removed.

[0091] <Third fastening section>

[0092] like Figure 3 and Figure 5 As shown in FIG. 1 , the third fastening portion 73 c is provided at the front end portion of the side wall flange portion 79 in the left under cover 7A and the right under cover 7B.

[0093] <4th fastening section>

[0094] A plurality of fourth fastening portions 73d are provided at appropriate intervals along the front-rear direction at the vehicle width direction inner end portions of the left under cover 7A and the right under cover 7B.

[0095] Suspension

[0096] Figure 1 The suspension device 2 shown is a buffer device that connects the rear wheel (not shown) to the vehicle body 1 and buffers the impact and vibration from the road surface transmitted to the vehicle cabin. The suspension device 2 is configured to include a suspension arm 3, a suspension arm cover 4, a trailing arm 5, and a stabilizer 6. The suspension device 2 is arranged behind the bottom cover 7.

[0097] <Suspension arm and suspension arm cover>

[0098] The suspension arm 3 is a pair of left and right link-shaped members disposed at the rear lower portion of a mounting frame (not shown) that rotatably supports a wheel (not shown). The suspension arm 3 is composed of an arm member extending in the vehicle width direction.

[0099] The suspension arm cover 4 is a plate-shaped protection member that covers and protects the suspension arm 3 .

[0100] <Trailing arm>

[0101] The trailing arm 5 is a member connected to a mounting frame (not shown) to suspend a wheel (not shown). The trailing arm 5 extends from the mounting frame (not shown) toward the front of the vehicle. The front end of the trailing arm 5 is connected to the vehicle body 1 via a rubber bushing or the like so as to be swingable in the vehicle width direction.

[0102] <Stabilizer>

[0103] The stabilizer 6 is a rod-shaped torsion beam (stabilizer bar) made of spring steel that applies spring reaction force to each buffer unit (not shown) to control the roll of the vehicle body 1. The left and right arm portions of the stabilizer 6 are attached to the suspension arm 3 via bushings using a connector (not shown).

[0104] The role of the lower body structure

[0105] Next, refer to Figures 1 to 9 The operation of the vehicle body understructure according to the embodiment of the present invention will be described.

[0106] like Figure 1 As shown, while the vehicle is running, there is a possibility that snow or the like on the road is bounced up by the wheels (not shown) and enters the under cover 7 from the first rear end portion 71 a of the under cover 7 .

[0107] like Figure 7 and Fig. 9 As shown in FIG. 1 , a cover rear wall portion 76 is provided at the first rear end portion 71 a of the bottom cover 7 and is provided to stand upward from the cover bottom portion 75 . Therefore, it is possible to suppress the entry of snow or the like into the inside of the bottom cover 7 .

[0108] like Figure 1 As shown in FIG. 1 , the periphery of the first rear end portion 71a of the under cover 7 is fixed to the vehicle body 1 by the first fastening portion 73a and the second fastening portion 73b. Therefore, the portion of the under cover 7 that is located rearward (the portion on the outside in the vehicle width direction) relative to the imaginary line (curve L1) connecting the first fastening portion 73a and the second fastening portion 73b is relatively easy to be bent upward.

[0109] In addition, if Figures 7 to 9 As shown, the under cover 7 has the first fastening portion 73a fixed to the vehicle body 1 disposed at a position lower than the second fastening portion 73b. Therefore, the under cover 7 can easily bend along the curve L1 from the first rear end portion 71a located outside the trailing arm 5 toward the outside in the vehicle width direction.

[0110] The cover rear wall portion 76 can be made less rigid than a portion having the same height by making the height H2 of the cover rear wall portion 76 lower than the height H1 of the cover side wall portion 78 , so that the periphery of the cover rear wall portion 76 can be easily bent.

[0111] In addition, if Figures 4 to 6As shown, the bottom cover 7 has a plurality of first ribs 7c and a plurality of second ribs 7d formed substantially over the entire upper surface 7a, thereby forming a reinforced structure that is difficult to bend.

[0112] Therefore, when snow or the like enters the undercover 7, the undercover portion (outer portion in the vehicle width direction) located behind the curve L1 is easily bent downward, so that the undercover 7 deforms without breaking when receiving the snow load.

[0113] As such, the vehicle body lower structure according to the embodiment of the present invention is as follows Figure 1 or Figure 3 As shown, the bottom cover 7 is provided with a part of the trailing arm 5 from below, the bottom cover 7 has a front cover portion 71 extending from the front of the trailing arm 5 to a position covering the front portion 51 of the trailing arm 5, and a rear cover portion 72 extending continuously toward the rear from the center portion in the vehicle width direction of the first rear end portion 71a (rear end portion) of the front cover portion 71, and the bottom cover 7 is fixed to the vehicle body 1 by a first fastening portion 73a and a second fastening portion 73b, wherein the first fastening portion 73a is arranged in front compared with the first rear end portion 71a (rear end portion) and is arranged on the outside in the vehicle width direction compared with the trailing arm 5, and the second fastening portion 73b is arranged in the rear compared with the first fastening portion 73a and is arranged on the inside in the vehicle width direction compared with the trailing arm 5.

[0114] According to this configuration, the vehicle body lower structure of the present invention fixes the under cover 7 to the vehicle body 1 by using the first fastening portion 73a provided on the outer side in the vehicle width direction relative to the trailing arm 5 and the second fastening portion 73b provided on the inner side in the vehicle width direction relative to the trailing arm 5. Therefore, the under cover 7 can be configured to have a relatively easy-to-bend structure in which the portion located rearward (the portion located on the outer side in the vehicle width direction) relative to the imaginary line (curve L1) connecting the first fastening portion 73a and the second fastening portion 73b. As a result, when snow or the like enters the under cover 7, the portion of the under cover 7 located rearward (the portion located on the outer side in the vehicle width direction) relative to the curve L1 is easily bent downward, thereby avoiding the load of the snow or the like and preventing the under cover 7 from being broken or damaged. In addition, the under cover 7 can be easily removed from the snow or the like that has entered the under cover 7 by bending the portion of the under cover 7 located rearward relative to the curve L1 downward.

[0115] In addition, if Figures 7 to 9 As shown in FIG. 1 , the first fastening portion 73a is arranged at a position lower than the second fastening portion 73b.

[0116] According to this configuration, the undercover 7 is disposed at a position where the height H3 of the first fastening portion 73a is lower than the height H4 of the second fastening portion 73b, and therefore, the side wall flange portion 79 and the cover side wall portion 78 where the first fastening portion 73a is located are located at a position lower than the second fastening portion 73b. Therefore, the undercover 7 is easily bent with the portion located outside the curve L1 being tilted toward the outside in the vehicle width direction with the curve L1 as the center.

[0117] In addition, if Figure 7 and Fig. 9 As shown, the front cover portion 71 includes: a cover bottom portion 75 having a lower surface 7b opposite to the road surface; and a cover rear wall portion 76, which is arranged on the outside in the vehicle width direction compared to the trailing arm 5, and is erected upward from the first rear end portion 71a (rear end portion) of the cover bottom portion 75.

[0118] According to this configuration, the undercover 7 can avoid the undercover 7 from being hit when the trailing arm 5 moves up and down during driving by arranging the undercover rear wall portion 76 on the outer side in the vehicle width direction compared to the trailing arm 5. In addition, the undercover rear wall portion 76 is erected at the first rear end portion 71a, so that snow and the like can be prevented from entering the undercover 7.

[0119] In addition, if Figure 8 or Fig. 9 As shown, it has: a hood side wall portion 78, which is erected upward within the range from the front end portion to the first rear end portion 71a (rear end portion) on the outside of the front hood portion 71 in the vehicle width direction and is connected to the hood rear wall portion 76; and a side wall flange portion 79, which is extended from the hood side wall portion 78 toward the outside in the vehicle width direction, and the first fastening portion 73a is provided on the side wall flange portion 79, and the height H2 of the hood rear wall portion 76 is lower than the height H1 of the hood side wall portion 78.

[0120] According to this configuration, the cover side wall portion 78 located below the side wall flange portion 79 is extended to be held at the cover bottom portion 75. The cover rear wall portion 76 can be made less rigid than a portion of the same height by making the height H2 of the cover rear wall portion 76 lower than the height H1 of the cover side wall portion 78, so that the periphery of the cover rear wall portion 76 can be easily bent.

[0121] In addition, if Figures 4 to 6 As shown, a plurality of first ribs 7c extending in the vehicle width direction and a plurality of second ribs 7d extending in a direction orthogonal to the plurality of first ribs 7c are formed on the upper surface 7a of the under cover 7.

[0122] According to this configuration, the under cover 7 has a plurality of first ribs 7c extending in the vehicle width direction and a plurality of second ribs 7d extending in the front-rear direction arranged in a lattice pattern on the upper surface 7a, thereby reinforcing the cover bottom 75 and making it difficult to bend.

[0123] [Modifications]

[0124] It should be noted that the present invention is not limited to the aforementioned embodiments, and various modifications and changes can be implemented within the scope of the technical concept. The present invention also includes inventions after these modifications and changes.

[0125] In this embodiment, if Figures 4 to 6 As shown in the figure, the case where the first rib 7c extending in the vehicle width direction and the second rib 7d extending in a direction orthogonal to the first rib 7c are formed on the upper surface 7a of the under cover 7 is described, but the present invention is not limited to this.

[0126] The plurality of first ribs 7c and the plurality of second ribs 7d may be formed on the lower surface 7b of the bottom cover 7. The bottom cover 7 can also be reinforced in this manner.

[0127] Alternatively, you may not set Figure 1 The insulation portion 8 is shown.

[0128] Therefore, the undercover 7 may be formed of a single metal plate in which the left undercover 7A and the right undercover 7B are integrated.

Claims

1. A vehicle body lower structure, characterized in that: An undercover is provided to cover a portion of the trailing arm from below. The bottom cover has: a front cover portion extending from the front side compared to the trailing arm to a position covering the front portion of the trailing arm; and a rear cover portion extending continuously toward the rear from a center portion in the vehicle width direction of a rear end portion of the front cover portion, The undercover is fixed to the vehicle body by a first fastening portion and a second fastening portion, wherein the first fastening portion is arranged forward of the rear end portion and is arranged outward in the vehicle width direction compared to the trailing arm. The second fastening portion is arranged rearward of the rear end portion and is provided on the inner side in the vehicle width direction than the trailing arm. The undercover includes a trailing arm cover portion formed outside in the vehicle width direction relative to an imaginary line connecting the first fastening portion and the second fastening portion so that the front cover portion overlaps at least a portion of the trailing arm in the vertical direction. The trailing arm cover portion does not include a fixing portion fixed to the vehicle body.

2. The vehicle body lower structure according to claim 1, characterized in that: The first fastening portion is arranged at a position lower than the second fastening portion.

3. The vehicle body lower structure according to claim 2, characterized in that: The front cover portion has: a cover bottom portion having a lower surface facing the road surface; and The cover rear wall portion is provided outside the trailing arm in the vehicle width direction and is provided to stand upward from the rear end portion of the cover bottom portion.

4. The vehicle body lower structure according to claim 3, characterized in that: have: a hood side wall portion which is erected upwardly in a range from a front end portion to a rear end portion of the front hood portion on the outside in the vehicle width direction and is connected to the hood rear wall portion; and a side wall flange portion extending from the cover side wall portion toward the outer side in the vehicle width direction, The first fastening portion is provided on the side wall flange portion, The height of the cover rear wall portion is lower than the height of the cover side wall portion.

5. The vehicle body lower structure according to any one of claims 1 to 4, characterized in that: A plurality of first ribs extending in a vehicle width direction and a plurality of second ribs extending in a direction orthogonal to the plurality of first ribs are formed on an upper surface or a lower surface of the under cover.

Images