Lower body structure of vehicle

Abstract

The present application aims at providing a lower vehicle body structure which can suppress the view of a muffler from the rear of a vehicle, improve the aesthetic appearance, and suppress the intake of under-floor traveling air behind a rear bumper, thereby improving the aerodynamic characteristics. A shielding member (60) is provided between a rear bumper (4) and a muffler (10), the shielding member (60) overlapping at least a rear longitudinal wall (10b) of the muffler (10) in the up-down direction and extending in the vehicle width direction in the rear view of the vehicle, a guide portion (62) being provided in the shielding member (60) to guide under-floor traveling air flowing rearward at the lower portion of the muffler (10) downward.

Description

TECHNICAL FIELD

[0001] The present application relates to a lower vehicle body structure of a vehicle which is provided with a horizontally-arranged muffler extending in a vehicle width direction in front of a lower portion of a rear bumper. BACKGROUND

[0002] A vehicle provided with a horizontally-arranged muffler extending in a vehicle width direction in front of a lower portion of a rear bumper of the above-described example is known at present.

[0003] At this time, if the position at which the lower end of the muffler is arranged is lower than the position at which the lower end of the rear bumper is arranged, the muffler will be seen from the rear, and the vehicle will be poor in appearance, especially when the rear vehicle's night light is reflected from the muffler.

[0004] In addition, there is a technical problem that, with respect to the above-described rear bumper portion, underfloor running air flowing under a floor from the front of the vehicle toward the rear of the vehicle will be drawn into the lower portion of the rear of the rear bumper, thereby causing deterioration in the Cd value (drag coefficient) in the aerodynamic characteristics.

[0005] However, the lower vehicle body structure of the vehicle disclosed in Patent Document 1 has the following problem: the underfloor running air flowing under the floor from the front of the vehicle toward the rear of the vehicle will be drawn into the lower portion of the rear of the rear bumper, thereby causing deterioration in the Cd value (drag coefficient) in the aerodynamic characteristics.

[0006] The lower vehicle body structure of the vehicle disclosed in Patent Document 1 has the advantage that the aerodynamic characteristics can be improved, but on the other hand, has the following problem: the underfloor running air flowing under the floor from the front of the vehicle toward the rear of the vehicle will be drawn into the lower portion of the rear of the rear bumper, thereby causing deterioration in the Cd value (drag coefficient) in the aerodynamic characteristics.

[0007] PRIOR ART DOCUMENTS

[0008] PATENT DOCUMENTS

[0009] Patent Document 1: Patent No. 6052229 SUMMARY

[0010] PROBLEMS TO BE SOLVED BY THE INVENTION

[0011] Therefore, the present application aims to provide a lower vehicle body structure of a vehicle which can suppress the muffler from being seen from the rear of the vehicle, improve the appearance, and suppress underfloor running air from being drawn into the rear of the rear bumper, thereby improving the aerodynamic characteristics.

[0012] MEANS OF SOLVING THE PROBLEMS

[0013] The present application relates to a lower body structure of a vehicle, which is provided with a horizontally-arranged muffler extending in a vehicle width direction in front of a lower portion of a rear bumper, wherein: a shielding member is provided between the rear bumper and the muffler, the shielding member overlapping at least a rear longitudinal wall of the muffler in a vertical direction in a rearward view of the vehicle and extending in the vehicle width direction, and a guide portion is provided in the shielding member, which guides floor under running air flowing rearward in a lower portion of the muffler downward.

[0014] According to the present application, the muffler can be hidden from view from the rear of the vehicle, the appearance can be improved, and the floor under running air can be prevented from being drawn into the rear of the rear bumper, so that the aerodynamic characteristics can be improved.

[0015] In detail, the shielding member overlaps at least the rear longitudinal wall of the muffler in the vertical direction in the rearward view of the vehicle, so that the muffler can be hidden from view from the rear of the vehicle, and the appearance can be improved.

[0016] In addition, the guide portion is provided in the shielding member, which guides the floor under running air flowing from the front of the vehicle to the rear of the vehicle in the lower portion of the muffler downward, so that the floor under running air can be directed downward to prevent the floor under running air from being drawn into the rear of the rear bumper, and the aerodynamic characteristics can be improved.

[0017] As an aspect of the present application, a blowout hole can be provided in the guide portion, which blows out the floor under running air flowing rearward in an upper portion of the muffler downward.

[0018] According to the present application, the floor under running air blown downward from the blowout hole pushes the floor under running air downward, so that the floor under running air can be further prevented from being drawn into the rear of the rear bumper, and the improvement of the aerodynamic characteristics can be further promoted.

[0019] As an aspect of the present application, the shielding member can have a shielding surface overlapping at least the rear longitudinal wall of the muffler in the vertical direction in the rearward view of the vehicle, and a guide surface located forward of the shielding surface and guiding the floor under running air flowing rearward in the lower portion of the muffler downward, wherein the guide surface and the shielding surface are arranged offset in a vehicle front-rear direction.

[0020] According to the present application, the following technical effects can be obtained.

[0021] That is, the shielding function required by the shielding surface is different from the guiding function required by the guide surface, and by arranging the guide surface and the shielding surface offset in the vehicle front-rear direction, the functions corresponding to the respective requirements can be ensured.

[0022] Further, as a mode of the present application, it can be configured such that the shielding surface is inclined so as to be located more forward of the vehicle as it goes downward, and the guide surface is inclined so as to be located more rearward of the vehicle as it goes downward.

[0023] According to the present application, it is possible to form the shielding surface and the guide surface in an inclined shape corresponding to the respective requirements of the shielding surface and the guide surface.

[0024] Further, as a mode of the present application, it can be configured such that the blowout hole is formed between the shielding surface and the guide surface.

[0025] According to the present application, the air blown out from the blowout hole formed between the shielding surface and the guide surface pushes the underfloor running air downward, and suppresses the underfloor running air from being drawn into the rear of the rear bumper, so that it is possible to improve the aerodynamic characteristics.

[0026] Further, as a mode of the present application, it can be configured such that the blowout hole is formed in a slit shape that is long in the vehicle width direction at a central portion of the shielding member in the vehicle width direction.

[0027] According to the present application, it is possible to sufficiently ensure the function of the air blown out from the blowout hole in the slit shape that is long in the vehicle width direction to push the underfloor running air at the central portion in the vehicle width direction downward, and it is possible to further more surely suppress the underfloor running air from being drawn into the rear of the rear bumper.

[0028] Effects of the Invention

[0029] The present application has the following technical effects: it is possible to suppress the muffler from being seen from the rear of the vehicle, improve the aesthetic appearance, and suppress the underfloor running air from being drawn into the rear of the rear bumper, and improve the aerodynamic characteristics. BRIEF DESCRIPTION OF DRAWINGS

[0030] Figure 1 is a plan view of the lower body structure of the vehicle;

[0031] Figure 2 is a vehicle left side view of the lower body structure of the vehicle;

[0032] Figure 3 is a rear view of the lower body structure of the vehicle;

[0033] Figure 4 is an oblique view of the rear suspension device;

[0034] Figure 5 is an oblique view of a main portion of the mounting structure of the first and second under cover members;

[0035] Figure 6 is a plan oblique view of the second under cover member;

[0036] Figure 7is a cross-sectional view along the A-A line of Figure 1

[0037] Figure 8 is a main part bottom view of Figure 7

[0038] Figure 9 is a bottom view of the shielding member;

[0039] Figure 10 is a top oblique view of the shielding member;

[0040] Figure 11 is a cross-sectional view of the vehicle-width-direction central portion of the shielding member. DETAILED DESCRIPTION

[0041] The present application aims at suppressing the visibility of a muffler from the rear of a vehicle, improving the aesthetic quality, and suppressing the intake of under-floor traveling air into the rear of a rear bumper, improving the aerodynamic characteristics, and this object is achieved by the following technical means: a lower vehicle body structure of a vehicle, which is provided with a horizontally-arranged muffler extending in the vehicle-width direction in front of the lower portion of a rear bumper, wherein a shielding member is provided between the rear bumper and the muffler, the shielding member overlaps at least the rear longitudinal wall of the muffler in the up-and-down direction in the rear view of the vehicle and extends in the vehicle-width direction, and a guide portion is provided in the shielding member, which guides the under-floor traveling air flowing in the rear direction in the lower portion of the muffler downward.

[0042]

EMBODIMENT

[0043] An embodiment of the present application will be described below based on the drawings.

[0044] The drawings illustrate a lower vehicle body structure of a vehicle, Figure 1 is a bottom view of the lower vehicle body structure of the vehicle, Figure 2 is a side view of the lower vehicle body structure of the vehicle from the left side of the vehicle, Figure 3 is a rear view of the lower vehicle body structure of the vehicle. Figure 4 is an oblique view of the rear suspension device, Figure 5 is an oblique view of the main part of the mounting structure of the first and second under cover members, Figure 6 is a bottom oblique view of the second under cover member.

[0045] In the Figure 2 , an upper curved portion is provided which stands upward from the rear end of a front floor panel, and a rear floor panel 1 is provided which extends rearward from the upper curved portion. The rear floor panel 1 forms the floor of the passenger compartment and the storage compartment, and a rear seat pan 2 is integrally formed in the rear floor panel 1.

[0046] ​​A rear side frame 3 of a front and back two-piece structure extending in the vehicle front and back direction is provided at both ends in the vehicle width direction of the floor from the rear end of the rear floor 1 to the rear end of the front floor.

[0047] A side beam (not shown) extending forward of the vehicle in continuation with the rear side frame 3 is provided, and the rear end of the side beam overlaps the front end of the rear side frame 3. Both the rear side frame 3 and the side beam are vehicle body strength members.

[0048] On the other hand, as shown in Figures 1-3 , a rear bumper 4 is attached to the rear portion of the vehicle in order to mitigate the impact from the rear at the time of a collision.

[0049] The rear bumper 4 is a resin injection molding product attached along the lower end of the rear portion of the vehicle. The rear bumper 4 covers the rear portion structure of the vehicle body including the rear bumper reinforcement, the rear portion of the rear floor 1, the rear portion of the rear side frame 3, the rear wall, and the muffler 10 described later from the rear.

[0050] As shown in Figures 1-3 , the rear bumper 4 has a main wall portion 4A covering the middle portion in the vehicle width direction in the rear portion structure of the vehicle body, and a side wall portion 4B wrapping around from the vehicle width direction end of the main wall portion 4A toward the front side of the vehicle so as to cover the left and right corner portions in the rear portion structure of the vehicle body.

[0051] As shown in Figure 3 , the main wall portion 4A of the rear bumper 4 is composed of an upper wall portion 5, a middle wall portion 6, and a lower wall portion 7. The upper end of the upper wall portion 5 is attached along the upper end of the rear wall. The middle wall portion 6 is in continuation with the lower portion of the upper wall portion 5 and extends in the up and down direction and the vehicle width direction. The lower wall portion 7 is in continuation with the lower portion of the middle wall portion 6 and extends in the up and down direction and the vehicle width direction. A lower piece portion 7a at the lower end of the lower wall portion 7 is located rearward of the rear wall in the front and back direction and below the rear floor 1 in the up and down direction.

[0052] The rear bumper 4 has a lower corner wall 4C in continuation with the vehicle width direction outer portion of the lower wall portion 7 and the lower portion of the side wall portion 4B, and an opening portion 8 is formed in the rear side surface portion of the lower corner wall 4C, which discharges exhaust gas from the tail pipes 12, 13 described later toward the rear of the vehicle.

[0053] The vehicle of the present embodiment is a front engine rear wheel drive, that is, an FR type, and therefore a tunnel portion 9 (see Figure 1 ) extending in the vehicle front and back direction and protruding toward the passenger compartment side is provided in the center in the vehicle width direction of the front floor.

[0054] In addition, as shown in FIG. 1, a muffler 10 as a silencing device is provided in a sideways configuration extending in the vehicle width direction at the lower front portion of the rear bumper 4. Figure 1

[0055] As shown in the figure, the front portion of the vehicle width direction of the muffler 10 has an intake pipe 11 that guides exhaust gas into the muffler 10, and at both ends of the vehicle width direction of the muffler 10, L-shaped tail pipes 12, 13 are provided, which are viewed from the bottom. The rear ends 12a, 13a of the tail pipes 12, 13 face the opening portion 8 in the rear bumper 4. In addition, as shown in FIG. 1, the lower side 10a of the muffler 10 is in a substantially flat shape. Figures 1-3

[0056] A rear suspension device 20 (refer to FIG. 2) that independently suspends the left and right rear wheels, which are not shown, is provided at the lower portion of the left and right pair of rear side frames 3. Figure 4 In the present embodiment, a multi-link type rear suspension is employed as the rear suspension device 20.

[0057] As shown in FIG. 1, the rear suspension device 20 has a suspension cross member 24 (so-called sub frame), in which a front cross member 21, a rear cross member 22, and left and right pair of side cross members 23, 23 are combined in a well crib shape from a top view of the vehicle. Figure 4

[0058] The front cross member 21 connects the front sides of the left and right pair of side cross members 23, 23 in the vehicle width direction. The rear cross member 22 connects the rear sides of the left and right pair of side cross members 23, 23 in the vehicle width direction.

[0059] The side cross member 23 extends in the vehicle front-rear direction, and the front side of the portion connected to the front cross member 21 extends to the front of the vehicle and to the outside in the vehicle width direction. A body mounting member 25 is provided at the front end of the side cross member 23.

[0060] In addition, the rear side of the portion connected to the rear cross member 22 of the side cross member 23 extends to the rear of the vehicle and to the outside in the vehicle width direction. A body mounting member 26 is provided at the rear end of the side cross member 23.

[0061] The multi-link type rear suspension has five suspension links 27, 28, 29, 30, 31 on the left and right sides. The five suspension links 27, 28, 29, 30, 31 include three lower links 27, 28, 29 on the lower side and two upper links 30, 31 on the upper side, and the suspension cross member 24 and a wheel support member (not shown) of the rear wheel are connected by the five suspension links 27, 31 on one side. ​​​

[0062] The three lower links located on the lower side include: a lower lateral link 27, a toe control link 28 located behind the lower lateral link 27, and a lower connecting link 29 located in front of the lower lateral link 27.

[0063] The two upper links located on the upper side include: an upper lateral link 30 and an upper trail link 31 located in front of the upper lateral link 30.

[0064] The aforementioned lower lateral link 27 extends from the mounting part 32 toward the outside of the vehicle body in the vehicle width direction, and its rear wheel side end 27a is connected to the wheel support member.

[0065] The aforementioned toe control link 28 extends forward from the mounting portion toward the outside of the vehicle body, and its rear wheel side end 28a is connected to the wheel support member.

[0066] The aforementioned lower connecting rod 29 extends backward from the mounting portion toward the outside of the vehicle body, and its rear wheel-side end 29a is connected to the wheel support member.

[0067] The aforementioned upper transverse link 30 extends forward from the mounting part 33 toward the outside of the vehicle body, and its rear wheel side end 30a is connected to the wheel support member.

[0068] The aforementioned upper connecting rod 31 extends backward from the mounting part 34 toward the outside of the vehicle body, and its rear wheel side end 31a is connected to the wheel support member.

[0069] like Figure 2 As shown, the suspension crossbeam 24 is fixed to the lower part of the rear side frame 3 via the front and rear body mounting members 25 and 26. Here, a mounting seat 35 is provided at the lower part of the rear side frame 3, which faces the front body mounting member 25 in the vertical direction, and the body mounting member 25 at the front end of the suspension crossbeam 24 is fixed to the mounting seat 35.

[0070] The aforementioned rear suspension device 20 includes a suspension shock absorber 36.

[0071] The suspension damper 36 has a sliding column 37 and a disc spring mounted between the upper and lower leaf plates. The upper end of the suspension damper 36 is mounted on the rear side frame 3, and the lower end of the suspension damper 36 is mounted on the lower lateral link 27.

[0072] That is, the multi-link rear suspension device 20 has a total of 5 sets of suspension links (lower lateral link 27, toe control link 28, lower connecting link 29, upper lateral link 30, upper connecting link 31, a total of 5 sets), and the above suspension links 27 to 31 extend from the position below the wheel cover inward in the vehicle width direction.

[0073] In addition, such as Figure 4As shown, the stabilizer bar 40 is housed in the rear portion of the side cross member 23 using the bracket 38 and the housing member 39.

[0074] The stabilizer bar 40 suppresses roll angle (for example, the angle of inclination of the vehicle body when the vehicle body inclines when the vehicle turns, which is called roll angle) when only a single wheel jolts, rebounds, and the like by the resistance of torsional rigidity.

[0075] Further, a bracket 41 extending from the lower portion of the vehicle body mounting member 25 toward the front in the vehicle outward direction is provided in the lower portion of the front end portion.

[0076] Among the above-mentioned suspension links (lower transverse link 27, toe control link 28, lower communication link 29, upper transverse link 30, upper communication link 31), as shown, Figure 5 a set of left and right pairs of the lower transverse links 27 as the first suspension links are configured in a U-shaped cross section with the upper side open.

[0077] That is, as shown, Figure 5 the above-mentioned lower transverse link 27 is configured in a U-shaped cross section by connecting a front wall 27b, a bottom wall 27c (see Figure 2 ), and a rear wall 27d, and has a flange portion 27e extending from the upper end of the front wall 27b toward the front of the vehicle and a flange portion 27f extending from the upper end of the rear wall 27d toward the rear of the vehicle.

[0078] As shown, Figure 5 on the upper side of the above-mentioned lower transverse link 27, the front and rear flange portions 27e, 27f are welded and fixed with an upper wall member 27h having an elongated hole 27g into which the piston rod 37 of the suspension shock absorber 36 is inserted, the upper wall member 27h allowing the lower transverse link 27 to displace up and down and improving the rigidity of the lower transverse link 27.

[0079] As shown, Figure 1 , Figure 2 and Figure 5 a first under cover member 51 is provided in the rear portion of the above-mentioned lower transverse link 27, the first under cover member 51 covering the lower side of the vehicle body in a state flush with the lower side of the lower transverse link 27, that is, in a state flush with the lower side of the bottom wall 27c.

[0080] Thus, by the first under cover member 51 in a state flush with the lower side of the lower transverse link 27, the first under cover member 51 that effectively utilizes the lower side of the lower transverse link 27 and saves space suppresses deterioration of aerodynamic characteristics. That is, the lower side of the lower transverse link 27 is utilized as part of the under cover portion, thereby correspondingly reducing the area of the first under cover member 51, saving space, and suppressing the intake of driving wind under the floor into the rear suspension device 20 and the surrounding portion thereof with the first under cover member 51.

[0081] like Figure 5 As shown, the first bottom cover member 51 includes: a bottom wall 51a; a plurality of mounting seats 51b that are raised upward from the bottom wall 51a and are shaped as truncated cones; and rib arches 51c that connect the outer periphery of the mounting seats 51b to the bottom wall 51a and extend radially.

[0082] On the other hand, several mounting pieces 42 are integrally provided on the rear wall 27d of the lower transverse link 27. The mounting base 51b of the first bottom cover member 51 is connected and fixed to the mounting pieces 42 of the lower transverse link 27 using mounting components 43 such as bolts and nuts, thereby installing the first bottom cover member 51 onto the lower transverse link 27.

[0083] like Figure 1 , Figure 5 As shown, among the aforementioned suspension links (lower lateral link 27, toe control link 28, lower connecting link 29, upper lateral link 30, and upper connecting link 31), the lower connecting link 29, which is a pair of left and right lower suspension links located on the front side of the vehicle with respect to the lower lateral link 27, is provided with a second bottom cover member 52 that covers the lower side of the vehicle body in a state that is flush with the lower side of the lower lateral link 27.

[0084] Thus, the deterioration of aerodynamic characteristics is further suppressed by the second bottom cover component 52 and the first bottom cover component 51 at the front and rear.

[0085] like Figure 5 As shown, the second bottom cover member 52 includes: a bottom wall 52a; a plurality of mounting seats 52b that are raised upward from the bottom wall 52a and are shaped as truncated cones; and rib arches 52c that connect the outer periphery of the mounting seats 52b to the bottom wall 52a and extend radially.

[0086] On the other hand, the lower connecting link 29 has an inverted U-shaped cross-section and is integrally formed with several mounting pieces 44 extending from the lower ends of the front and rear walls of the lower connecting link 29 in the vehicle's longitudinal direction. The mounting base 52b of the second bottom cover member 52 is connected and fixed to the mounting pieces 44 of the lower connecting link 29 using mounting components 45 such as bolts and nuts, thereby installing the second bottom cover member 52 onto the lower connecting link 29.

[0087] Figure 6 This is a bottom oblique view of the second bottom cover member 52. As shown in the figure, several rib arches 52d are provided parallel to each other on the lower side of the second bottom cover member 52, protruding downwards from the vehicle and extending in the longitudinal direction of the vehicle.

[0088] Thus, the aforementioned ribs 52d suppress the airflow from the floor under the second bottom cover member 52, which flows from the front of the vehicle to the rear of the vehicle, to the left and right in the vehicle width direction, thereby improving the rectification effect and increasing the rigidity of the second bottom cover member 52.

[0089] As shown in Figure 1 , the vehicle width direction inner side of the 2nd under cover member 52, the vehicle width direction inner side of the lower lateral link 27 at the base end side of the vehicle front portion, and the vehicle width direction inner side of the mounting portion 32 of the lower lateral link 27 are provided with a 3rd under cover member 53 that covers the lower side of the vehicle body.

[0090] Thus, together with the other under cover members, i.e., the 1st and 2nd under cover members 51, 52, the flow of the running wind under the floor is further improved.

[0091] As shown in Figure 4 , the 3rd under cover member 53 is supported by the suspension cross member 24 via a support member 46 located at the front lower portion of the side cross member 23 of the suspension cross member 24 and a support bracket 47 located below the vehicle width direction end portion of the front cross member 21.

[0092] In addition, as shown in Figure 3 , Figure 5 , the lower side of the lower lateral link 27 as the 1st suspension link is provided with a curvature shaped portion 48 that protrudes downward at the free end side thereof and a curvature shaped portion 49 that protrudes upward from the curvature shaped portion 48 to the longitudinal direction intermediate portion of the lower lateral link 27.

[0093] Curvature portions 54, 55 are provided in the bottom wall 51a of the 1st under cover member 51 along the curvature shaped portions 48, 49 of the lower lateral link 27. Thus, the curvature portions 54, 55 of the 1st under cover member 51 follow the curvature shape of the lower side of the lower lateral link 27 as the 1st suspension link, thereby ensuring the flow of the running wind under the floor.

[0094] As shown in Figure 1 , in the lower portion of the vehicle left side, in front of the 2nd and 3rd under cover members 52, 53, a 4th under cover member 56 is provided that covers the lower side of the vehicle body from the vehicle width direction left side lower end portion of the tunnel portion 9 to the outer side beam lower portion.

[0095] Similarly, as shown in Figure 1 , in the lower portion of the vehicle right side, in front of the 2nd and 3rd under cover members 52, 53, a 5th under cover member 57 is provided that covers the lower side of the vehicle body from the vehicle width direction right side lower end portion of the tunnel portion 9 to the outer side beam lower portion. The 4th and 5th under cover members 56, 57 are respectively mounted and supported to the vehicle body.

[0096] Figure 7 is a sectional view along the A-A line of Figure 1 , Figure 8 is a plan view of a main portion of Figure 7 , Figure 9 is a plan view of a shield member,Figure 10 is a plan oblique view of the shielding member, Figure 11 is a sectional view of a vehicle-width-direction central portion of the shielding member.

[0097] As Figure 7 shown, the rear side frame 3 is provided with a rear side frame upper member 3A located at an upper portion of the rear floor 1 and a rear side frame lower member 3B located at a lower portion of the rear floor 1.

[0098] Further, as Figure 7 shown, the muffler 10 is configured by joining a lower flange of a muffler upper case 14 and an upper flange of a muffler lower case 15, and is supported by the rear side frame lower member 3B using a plurality of suspension members 16.

[0099] Further, as Figure 7 , Figure 8 shown, between a lower piece portion 7a of the lower wall portion 7 of the rear bumper 4 extending in the vehicle front-rear direction and a rear portion of the muffler 10, a cover member 60 as a shielding member is provided.

[0100] As Figure 7 , Figure 8 shown, the cover member 60 overlaps at least the rear portion vertical wall 10b of the muffler 10 in the up-down direction and extends in the vehicle-width direction in the vehicle rear view.

[0101] That is, as Figure 7 shown, the cover member 60 is provided with a cover surface 61 as a shielding surface overlapping the rear portion vertical wall 10b of the muffler 10 in the up-down direction in the vehicle rear view.

[0102] As Figure 8 shown, the cover surface 61 extends in the vehicle-width direction between the vehicle-width-direction central portions of the left and right pair of rear side frame lower members 3B.

[0103] Further, as Figure 7 , Figure 8 shown, the cover member 60 is provided with a guide portion 62 that guides downward the under-floor traveling wind e1 flowing from the vehicle front toward the vehicle rear at a lower portion of the muffler 10. That is, the cover member 60 is provided with a guide surface 63 located forward of the cover surface 61 as a shielding surface and guiding downward the under-floor traveling wind e1 flowing from the vehicle front toward the vehicle rear at a lower portion of the muffler 10.

[0104] As Figure 8 shown, the guide surface 63 extends in the vehicle-width direction between the vertical wall portions on the vehicle-width-direction inner sides of the left and right pair of rear side frame lower members 3B.

[0105] Thus, the cover member 60 positioned between the rear bumper 4 and the muffler 10 overlaps at least the rear longitudinal wall 10b of the muffler 10 in the up-down direction and extends in the vehicle width direction in the rear view of the vehicle, and a guide portion 62 that guides the under-floor traveling air e1 flowing rearward at the lower portion of the muffler 10 downward is provided in the cover member 60.

[0106] Thus, the muffler 10 is hidden from the rear of the vehicle, the aesthetic quality is improved, and the under-floor traveling air e1 is directed downward to prevent the under-floor traveling air e1 from being drawn into the rear of the rear bumper 4 (see drawn-in air e4 in FIG. 6), thereby improving the aerodynamic characteristics. Figure 7

[0107] In detail, the cover member 60 overlaps at least the rear longitudinal wall 10b of the muffler 10 in the up-down direction in the rear view of the vehicle, and thus the muffler 10 is hidden from the rear of the vehicle, thereby improving the aesthetic quality.

[0108] Further, the guide portion 62 that guides the under-floor traveling air e1 flowing rearward at the lower portion of the muffler 10 downward is provided in the cover member 60, and thus the under-floor traveling air e1 is directed downward to prevent the under-floor traveling air e1 from being drawn into the rear of the rear bumper 4 (see drawn-in air e4 in FIG. 6), thereby improving the aerodynamic characteristics.

[0109] As shown in FIG. 6, the cover member 60 has a front flange portion 64 extending from the upper end of the guide portion 62 toward the front of the vehicle and a standing wall 65 standing upward from the front end of the front flange portion 64. Figure 9 Figure 10 Figure 11 In detail, the cover member 60 overlaps at least the rear longitudinal wall 10b of the muffler 10 in the up-down direction in the rear view of the vehicle, and thus the muffler 10 is hidden from the rear of the vehicle, thereby improving the aesthetic quality.

[0110] Further, as shown in the figure, the cover member 60 has a rear flange portion 66 extending from the upper end of the cover surface 61 toward the rear of the vehicle and a standing wall 67 standing upward from the rear end of the rear flange portion 66.

[0111] Further, as shown in the figure, the cover member 60 has a rear flange portion 66 extending from the upper end of the cover surface 61 toward the rear of the vehicle and a standing wall 67 standing upward from the rear end of the rear flange portion 66. Figure 9 Figure 8 Further, as shown in the figure, the cover member 60 has a rear flange portion 66 extending from the upper end of the cover surface 61 toward the rear of the vehicle and a standing wall 67 standing upward from the rear end of the rear flange portion 66. Figure 8 As shown in FIG. 6, the cover member 60 has a front flange portion 64 extending from the upper end of the guide portion 62 toward the front of the vehicle and a standing wall 65 standing upward from the front end of the front flange portion 64.

[0112] Figure 11 As shown in FIG. 6, the cover member 60 has a front flange portion 64 extending from the upper end of the guide portion 62 toward the front of the vehicle and a standing wall 65 standing upward from the front end of the front flange portion 64. Figure 7

[0113] As shown in FIG. 6, the cover member 60 has a front flange portion 64 extending from the upper end of the guide portion 62 toward the front of the vehicle and a standing wall 65 standing upward from the front end of the front flange portion 64.​​​​​​Figures 9-11 As shown, the blow-out hole 70 is formed between the covering surface 61 and the guide surface 63.

[0114] In addition, the aforementioned blow-out hole 70 has the following features: located at the center in the vehicle width direction and within a certain range α in the vehicle width direction (refer to...). Figure 9 A continuous slit-shaped blow-out hole 71 (so-called slit-shaped opening) and several independent blow-out holes 72 (so-called square holes) with small opening areas, located on the left and right sides of the blow-out hole 71 in the vehicle width direction and spaced apart in the vehicle width direction.

[0115] In this embodiment, the vehicle width length of the aforementioned certain range α is set to approximately 30% of the separation distance between the central portions of the left and right rear side frame lower parts 3B in the vehicle width direction, but the forming length of the slit-shaped blow-out hole 71 in the vehicle width direction is not limited to this. In addition, the blow-out hole 72 is formed as a square hole, but it can also be a round hole.

[0116] When the driving air e1 flowing rearward from the floor below the muffler 10 encounters the guide section 62, it is guided downward by the guide section 62 to separate. As the separation air e2, it will flow further rearward. However, by providing the blowout hole 70, the driving air (blowout air e3) blown out from the blowout hole 70 will push the separation air e2 further downward. As a result, the driving air under the floor is further suppressed from being drawn into the rear bumper 4 (draw-in air e4), which further promotes the improvement of aerodynamic characteristics.

[0117] In addition, such as Figure 8 , Figure 9 As shown, the blowout 70 is formed into a slit shape that extends in the vehicle width direction at the center of the cover member 60. This ensures that the air blown out from the slit-shaped blowout 70 (i.e., the blowout air e3) at the center of the vehicle width direction is sufficiently ventilated to remove the driving air (refer to here) from the floor below the floor in the vehicle width direction. Figure 7 The function shown is to push the stripping air (e2) downwards. This further and more effectively suppresses the wind from the floor from being drawn into the rear bumper 4.

[0118] And, as Figure 7 , Figure 11 As shown, the aforementioned guide surface 63 and the aforementioned covering surface 61 are offset in the longitudinal direction of the vehicle.

[0119] The shielding function required by the covering surface 61, which is originally a shielding surface, and the guiding function required by the guiding surface 63 are different. By offsetting the guiding surface 63 and the covering surface 61 in the front and rear directions of the vehicle, the functions corresponding to their respective needs are ensured.

[0120] like Figure 11As shown, the aforementioned covering surface 61 is inclined downwards towards the front of the vehicle, while the aforementioned guiding surface 63 is inclined downwards towards the rear of the vehicle. In this embodiment, as shown in the figure, the covering surface 61 is inclined downwards towards the front of the vehicle at an angle θ1 relative to the imaginary vertical line (VER), and the angle θ1 is set to approximately 15 degrees.

[0121] Furthermore, the guide surface 63 is inclined relative to the imaginary vertical line (VER) at an angle θ2, moving downwards and further behind the vehicle. The angle θ2 is set within the range of 15 degrees to 30 degrees. However, the angles θ1 and θ2 are not limited to these values.

[0122] Thus, the inclined covering surface 61 and the guiding surface 63 are formed according to their respective needs.

[0123] In addition, such as Figure 10 As shown, between the guide surface 63 and the covering surface 61, which are offset in the vehicle's longitudinal direction, several rib arches 73 are formed throughout the vehicle width direction, connecting the guide surface 63 and the covering surface 61 in the vehicle's longitudinal direction. The thickness of each rib arch 73 is so thin that it does not obstruct the flow of the blown air e3. Each rib arch 73 ensures the rigidity of the area where the blown hole 70 is formed.

[0124] Furthermore, the covering member 60 (shielding member) having the aforementioned covering surface 61, guide portion 62, guide surface 63, flange portion 64, 66, upright wall 65, 67, mounting portion 68, 69, blowout hole 70, and rib arch 73 can be integrally formed from synthetic resin.

[0125] Additionally, in the diagram, arrow F indicates the front of the vehicle, arrow R indicates the rear of the vehicle, arrow IN indicates the inside of the vehicle in the width direction, arrow OUT indicates the outside of the vehicle in the width direction, and arrow UP indicates the top of the vehicle.

[0126] As described above, the lower body structure of the vehicle involved in this embodiment has a transversely arranged muffler 10 extending in the vehicle width direction at the lower front of the rear bumper 4, wherein: a shielding member (refer to the covering member 60) is provided between the rear bumper 4 and the muffler 10, the shielding member (covering member 60) overlaps with at least the rear longitudinal wall 10b of the muffler 10 in the vertical direction and extends in the vehicle width direction from the rear view of the vehicle, the shielding member (covering member 60) is provided with a guide portion 62, the guide portion 62 guides downward the driving wind e1 (refer to the floor under the lower part of the muffler 10 that flows rearward) below the floor. Figure 7 ).

[0127] According to the lower vehicle body structure of the vehicle as described above, it is possible to suppress the muffler 10 from being seen from the rear of the vehicle, improve the aesthetic appearance, and suppress the underfloor running wind from being drawn into the rear of the rear bumper 4, thereby improving the aerodynamic characteristics.

[0128] Specifically, the shielding member (covering member 60) overlaps at least the rear longitudinal wall 10b of the muffler 10 in the vertical direction in the rear view of the vehicle, so it is possible to suppress the muffler 10 from being seen from the rear of the vehicle, thereby improving the aesthetic appearance.

[0129] Further, the shielding member (covering member 60) is provided with a guide portion 62 that guides the underfloor running wind e1 flowing rearward at the lower portion of the muffler 10 downward, so it is possible to bias the underfloor running wind (specifically, the peel-off wind e2) downward in order to suppress the underfloor running wind from being drawn into the rear of the rear bumper 4 (see the drawn-in wind e4), thereby improving the aerodynamic characteristics.

[0130] Further, in the lower vehicle body structure of the vehicle as described above, the guide portion 62 is provided with a blowout hole 70 that guides the running wind (blowout wind e3) flowing rearward at the upper portion of the muffler 10 downward and blows it out (see Figure 7 、 Figure 11 ).

[0131] According to the lower vehicle body structure of the vehicle as described above, the running wind (blowout wind e3) blown downward from the blowout hole 70 pushes the underfloor running wind (peel-off wind e2) downward, so it is possible to further suppress the underfloor running wind from being drawn into the rear of the rear bumper 4 (drawn-in wind e4), thereby further improving the aerodynamic characteristics.

[0132] Further, in the lower vehicle body structure of the vehicle as described above, the shielding member (covering member 60) has a shielding surface (covering surface 61) that overlaps at least the rear longitudinal wall 10b of the muffler 10 in the vertical direction in the rear view of the vehicle, and a guide surface 63 that is located forward of the shielding surface (covering surface 61) and guides the underfloor running wind e1 flowing rearward at the lower portion of the muffler 10 downward, wherein the guide surface 63 and the shielding surface (covering surface 61) are disposed offset in the vehicle front-rear direction (see Figure 7 ).

[0133] According to the lower vehicle body structure of the vehicle as described above, the following technical effects are achieved.

[0134] That is, the shielding function required by the shielding surface (covering surface 61) and the guiding function required by the guide surface 63 are different, and by disposing the guide surface 63 and the shielding surface (covering surface 61) offset in the vehicle front-rear direction, it is possible to ensure the functions corresponding to the respective requirements.

[0135] Further, in the lower vehicle body structure of the vehicle described above, the shielding surface (covering surface 61) is inclined so as to be located more forward in the vehicle as it goes downward, and the guide surface 63 is inclined so as to be located more rearward in the vehicle as it goes downward (see Figure 11 ).

[0136] According to the lower vehicle body structure of the vehicle described above, the shielding surface (covering surface 61) and the guide surface 63 can be formed in an inclined shape corresponding to the respective requirements thereof.

[0137] Further, in the lower vehicle body structure of the vehicle described above, the blowout hole 70 is formed between the shielding surface (covering surface 61) and the guide surface 63 (see Figure 11 ).

[0138] According to the lower vehicle body structure of the vehicle described above, the air (blowout air e3) blown out from the blowout hole 70 formed between the shielding surface (covering surface 61) and the guide surface 63 pushes down the underfloor running air (stripped air e2) toward the lower side, and the underfloor running air drawn into the rear bumper 4 rearward (drawn-in air e4) is suppressed, so that the aerodynamic characteristics can be improved.

[0139] Further, in the lower vehicle body structure of the vehicle described above, the blowout hole 70 is formed in a slit shape long in the vehicle width direction at the vehicle width direction central portion of the shielding member (covering member 60) (see blowout hole 71) (see Figure 9 ).

[0140] According to the lower vehicle body structure of the vehicle described above, the air (blowout air e3) blown out from the blowout hole 71 in the slit shape long in the vehicle width direction can sufficiently push down the underfloor running air (stripped air e2) at the vehicle width direction central portion toward the lower side, and the underfloor running air drawn into the rear bumper 4 rearward (drawn-in air e4) can be further more surely suppressed.

[0141] The correspondence between the technical solutions of the present application and the above-described embodiments is as follows: the shielding member of the present application corresponds to the covering member 60 of the embodiments, and hereinafter the same, the shielding surface corresponds to the covering surface 61, but the present application is not limited to the technical solutions of the above-described embodiments.

[0142]

Utility

[0143] As described above, the present application is useful for the lower vehicle body structure of a vehicle provided with a horizontally-arranged muffler extending in the vehicle width direction in front of a rear bumper.

[0144]

Numbering Explanation

[0145] 4 … rear bumper

[0146] 10 … muffler

[0147] 10b…rear vertical wall

[0148] 60…covering member (shielding member)

[0149] 61…covering surface (shielding surface)

[0150] 62…guide portion

[0151] 63…guide surface

[0152] 70…blowout hole

Claims

1. A lower body structure of a vehicle, which is provided with a transversely arranged muffler extending in a vehicle width direction in front of a lower portion of a rear bumper, characterized by: a shielding member provided between the rear bumper and the muffler; the shielding member overlapping at least a rear longitudinal wall of the muffler in a vertical direction in a rearward view of the vehicle and extending in the vehicle width direction; a guide portion provided in the shielding member, which guides downward a floor under running air flowing rearward at a lower portion of the muffler; a blowout hole provided at a lower rear portion of the guide portion, which guides downward and blows out running air flowing rearward at an upper portion of the muffler; the shielding member including a shielding surface overlapping at least the rear longitudinal wall of the muffler in the vertical direction in the rearward view of the vehicle, and a guide surface located forward of the shielding surface and guiding downward the floor under running air flowing rearward at the lower portion of the muffler; the guide surface and the shielding surface being provided offset in a vehicle longitudinal direction; the shielding surface being inclined such that a lower portion thereof is located further forward in the vehicle than an upper portion thereof, and the guide surface being inclined such that a lower portion thereof is located further rearward in the vehicle than an upper portion thereof; the blowout hole being formed between the shielding surface and the guide surface; and the blowout hole being formed in a slit shape that is long in the vehicle width direction at a central portion of the shielding member in the vehicle width direction. ​ ​ ​ ​ ​ ​ ​ ​ ​

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