Vehicle underbody structure

Abstract

To provide a vehicle lower part structure that can suppress an increase in air resistance when a vehicle travels even in a structure where an on-vehicle component is located below an undercover.SOLUTION: A vehicle lower part structure includes: an undercover 8 that closes a part of an on-vehicle component housing 4; and an on-vehicle component 9 having a lower end portion 9a protruding further downward than a lower end of the on-vehicle component housing 4. The undercover 8 includes a flat plate-shaped base 21, and a protrusion 22 protruding downward from the base 21. A lower surface 21a of the base 21 is disposed above the lower end portion 9a of the on-vehicle component 9 in a vehicle side view. The projection 22 is disposed in front of the on-vehicle component 9 at a predetermined interval in a vehicle front-back direction in the vehicle side view. A lowest portion 22d1 of the protrusion 22 is formed above the lower end portion 9a of the on-vehicle component 9 and below the lower surface 21a of the base 21.SELECTED DRAWING: Figure 7

Description

[Technical field]

[0001] The present invention relates to a vehicle undercarriage. [Background technology]

[0002] A floor tunnel that is open downward is usually formed under the vehicle, and the floor tunnel houses an exhaust pipe as well as on-board components such as a catalyzer and a pre-silencer. Conventionally, in order to improve the aerodynamics of the vehicle, an undercover has been provided under the vehicle so as to close at least a portion of the floor tunnel.

[0003] Moreover, in the vehicle underbody structure described in Patent Document 1, an opening is provided in the undercover to suppress an increase in air resistance caused by the undercover to the wind flowing under the vehicle while traveling. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] JP 2019-064315 A Summary of the Invention [Problem to be solved by the invention]

[0005] In the above-described vehicle underbody structure, the on-board parts such as the catalyst are located above the undercover, so that the on-board parts do not increase air resistance. However, if the on-board parts are located so as to protrude below the undercover through an opening in the undercover, the air flow caused by traveling will collide with the on-board parts, increasing air resistance.

[0006] It is conceivable to place the undercover below the vehicle components, but in this case, the wind from the engine room through the floor tunnel inside the vehicle is likely to collide with the wind flowing horizontally under the vehicle when it passes through the opening of the undercover toward the bottom of the vehicle. Therefore, this also increases air resistance, making it impossible to suppress air resistance.

[0007] The present invention has been made in consideration of the above-mentioned circumstances, and aims to provide a vehicle underbody structure that can suppress an increase in air resistance when the vehicle is traveling, even in a configuration in which there are parts where on-board components are located below the undercover. [Means for solving the problem]

[0008] The vehicle understructure of the present invention is a vehicle understructure having a drive source accommodating section having a space capable of accommodating a drive source of the vehicle at a front side of the vehicle, the vehicle understructure including an on-board part accommodating section formed in the underside of the vehicle rearward of the drive source accommodating section, extending in the fore-and-aft direction of the vehicle and open downward, an undercover arranged rearward of the space and in a position to close a part of the downward open portion of the on-board part accommodating section, and guiding both a first traveling wind flowing under the vehicle and a second traveling wind flowing from the space through the on-board part accommodating section to the rear of the vehicle, and a second traveling wind flowing from the space through the on-board part accommodating section to the rear of the vehicle, the vehicle understructure including an on-board part accommodating section formed in the underside of the vehicle rearward of the drive source accommodating section, the on-board part accommodating section having a space capable of accommodating a drive source of the vehicle at a frontward or rearward direction of the vehicle, the on-board part accommodating section having a drive source accommodating section and an on-board part accommodating section formed in the underside of the vehicle rearward of the undercover, the on-board part accommodating section having a drive source accommodating section and an on-board part ... and an on-board component arranged at a position above the lower end of the on-board component storage section, the on-board component having a lower end protruding downwardly beyond the lower end of the on-board component storage section, the undercover having a flat base and a convex portion protruding downwardly from the base, the lower surface of the base being arranged above the lower end of the on-board component in a side view of the vehicle, the convex portion being arranged at a predetermined distance in front of the on-board component in the fore-and-aft direction of the vehicle in a side view of the vehicle, and the lowermost portion of the convex portion being formed so as to be above the lower end of the on-board component and below the lower surface of the base.

[0009] According to this configuration, the undercover is composed of a flat base and a protruding portion, and the protruding portion protrudes downward from the base, so that the first traveling wind flowing through the lower part of the vehicle is directed downward of the on-board component. The lowest part of the protruding portion is formed to be above the lower end of the on-board component and below the lower surface of the base, so that the opening area of ​​the gap formed between the protruding portion and the on-board component is limited. That is, the opening area of ​​this gap is narrower than the opening area of ​​the gap when the lowest part of the protruding portion is below the lower end of the on-board component. Therefore, the two winds, upper and lower, guided by the undercover, i.e., the first traveling wind flowing through the lower part of the vehicle and the second traveling wind from the space of the drive source accommodating portion are less likely to collide in the gap between the protruding portion and the on-board component, and it is possible to flow these first and second traveling winds along the on-board component to the rear of the vehicle. As a result, even in a configuration in which the on-board component is partially located below the undercover, it is possible to suppress an increase in air resistance during vehicle travel.

[0010] In the above vehicle underbody structure, it is preferable that a first curved surface is formed on an end portion on a vehicle front side of the on-vehicle component, the first curved surface extending in a downward direction from the front to the rear of the vehicle in a side view of the vehicle.

[0011] According to this configuration, the second traveling wind on the side of the on-board component storage unit guided toward the rear of the vehicle by the undercover can flow smoothly along the first curved surface of the on-board component to the lower end of the on-board component, thereby making it possible to prevent the flow of the second traveling wind from being obstructed.

[0012] In the above vehicle underbody structure, it is preferable that a second curved surface is formed on the end portion of the on-board component on the vehicle rear side, which extends in an upward direction from the front to the rear of the vehicle when viewed from the side of the vehicle, and that the curvature of the second curved surface is set to be greater than the curvature of the first curved surface.

[0013] According to this configuration, the curvature of the second curved surface formed on the end of the on-board component on the vehicle rear side is set to be larger than that of the first curved surface, so that the traveling wind flowing from the undercover to the vehicle rear along the lower end of the on-board component is easily separated from the second curved surface and is less likely to flow along the second curved surface into the on-board component storage section. Therefore, it is possible to suppress the inflow of the traveling wind into the on-board component storage section without impeding the flow of the traveling wind to the vehicle rear.

[0014] In the above vehicle underbody structure, it is preferable that the protruding portion has an upwardly extending portion provided so as to extend upward at a rear end portion in the vehicle front-rear direction.

[0015] According to this configuration, the upward extension portion extends upward at the rear end portion of the convex portion. This upward extension portion guides the second traveling wind from the space of the drive source accommodating portion in a direction inclined downward toward the rear of the vehicle just before it enters the gap between the convex portion and the on-board component, so that the second traveling wind can merge at an acute angle with the first traveling wind flowing under the vehicle. Moreover, the upward extension portion further narrows the gap between the convex portion and the on-board component, making it even more difficult for the first traveling wind and the second traveling wind to collide in the gap. Therefore, the two actions of the upward extension portion, which allow the traveling winds to merge at an acute angle and narrow the gap, make it possible to further suppress an increase in air resistance when the vehicle is traveling.

[0016] In the above vehicle underbody structure, it is preferable that a lower surface of the convex portion has an arc shape when seen from the rear of the vehicle.

[0017] According to this configuration, the first traveling wind flowing under the vehicle flows smoothly toward the rear of the vehicle along the arc-shaped lower surface of the convex portion, so that it is possible to further suppress an increase in air resistance when the vehicle is traveling.

[0018] In the above vehicle underbody structure, it is preferable that a front portion of the convex portion in the vehicle longitudinal direction has a shape that narrows toward the front of the vehicle in a bottom view of the vehicle.

[0019] With this configuration, when the first traveling wind flowing under the vehicle hits the front portion, which has a shape that narrows toward the front of the vehicle (a so-called tapered shape), the traveling wind is dispersed in the width direction of the convex portion and is less likely to hit on-board components, thereby making it possible to further suppress an increase in air resistance while the vehicle is moving. Effect of the Invention

[0020] According to the vehicle underbody structure of the present invention, even in a configuration in which a portion of an on-vehicle component is located below an undercover, an increase in air resistance during vehicle travel can be suppressed. [Brief description of the drawings]

[0021] [Figure 1] 1 is a bottom view of a vehicle body showing an overall configuration of a vehicle underbody structure according to an embodiment of the present invention. [Diagram 2] FIG. 2 is a cross-sectional view taken along line II-II of FIG. [Diagram 3] FIG. 2 is a bottom view of the undercover of FIG. [Figure 4] 2 is a rear view of the vehicle of the undercover of FIG. 1. [Diagram 5] 2 is a side view of the vehicle of the undercover of FIG. 1. [Figure 6] 2 is a perspective view of the undercover of FIG. 1 as viewed from above and behind the vehicle. FIG. [Figure 7] 3 is an explanatory diagram showing a state in which a first traveling wind and a second traveling wind flow along a protruding portion of an undercover and a catalyzer in FIG. 2.

[0023] FIG. [Figure 8] 2 is a rear view of the vehicle of a lower end portion of a catalyzer and a protruding portion of an undercover in FIG. 1. [Figure 9] 8 is an explanatory diagram showing in more detail the flow of a second traveling wind by enlarging the vicinity of the gap between the protrusion of the undercover and the catalyzer in FIG. 7.

[0023] FIG. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0022] Hereinafter, a preferred embodiment of the present invention will be described in detail with reference to the accompanying drawings.

[0023] The lower structure of the vehicle 1 of this embodiment shown in Figures 1 and 2 is a structure in which the lower end 9a of the catalyzer 9 protrudes downward Z2 from the floor tunnel 4, and by providing a convex portion 22 protruding downward Z2 on the tunnel undercover 8, the convex portion 22 reduces the traveling wind that hits the lower end 9a of the catalyzer 9, thereby suppressing an increase in air resistance.

[0024] Specifically, the vehicle 1 shown in Figs. 1 and 2 is an automobile using an engine 5 as a drive source, and includes a frame 2 at the bottom of the vehicle, a floor panel 3 constituting the bottom surface of the vehicle, a floor tunnel 4 as an in-vehicle part storage section, an engine storage section 60 having an engine room 6, a flat-plate-shaped room undercover 7 that closes the bottom side of the engine room 6, a tunnel undercover 8 that closes a part of the front end side of the floor tunnel 4, and a catalyzer 9, a pre-silencer 10, and an exhaust pipe 11 as in-vehicle parts stored in the floor tunnel 4. The engine room 6 is disposed on the front side X1 of the vehicle, and is a space capable of storing the engine 5 that is the drive source of the vehicle 1. The tunnel undercover 8 corresponds to the undercover of the present invention. A main silencer (not shown) larger than the pre-silencer 10 is attached to the downstream end of the exhaust pipe 11.

[0025] The exhaust gas emitted from the engine 5 is purified by a catalytic filter inside the catalyst 9, and after the exhaust noise is reduced by a pre-silencer 10, it is discharged to the rear of the vehicle 1 through an exhaust pipe 11 and a main silencer (not shown).

[0026] The floor tunnel 4 has a half-cylindrical shape formed in the lower part of the vehicle 1 behind the engine housing portion 60 at a position X2 rearward, and has a space 12 extending in the vehicle front-rear direction X and open downward Z2.

[0027] The tunnel undercover 8 is disposed at a position rearward of the engine room 6 at X2 so as to close a part of the downward open portion of the floor tunnel 4 (a part of the front end side in this embodiment).

[0028] As shown in FIGS. 3 to 6, the tunnel undercover 8 includes a flat plate-shaped base 21 and a protrusion 22 that protrudes downward Z2 from a lower surface 21a of the base 21.

[0029] The tunnel undercover 8 is manufactured by a forming method such as press forming using a material such as a flat steel plate, and is integrally formed so that the base portion 21 and the protruding portion 22 are smoothly continuous.

[0030] The protrusion 22 has a shape in which its lower surface 22d protrudes downward Z2 and its upper surface 22e is recessed downward Z2. The lower surface 22d of the protrusion 22 is continuous with the lower surface 21a of the base 21, and can smoothly guide the first traveling wind A1 (see Figs. 7 and 9) flowing under the vehicle to the vehicle rear X2. In addition, the upper surface 22e of the protrusion 22 is continuous with the upper surface 21b of the base 21, and can smoothly guide the second traveling wind A2 (see Figs. 7 and 9) flowing from the engine room 6 to the floor tunnel 4 during vehicle travel to the vehicle rear X2. Therefore, as shown in Figs. 7 and 9, the tunnel undercover 8 can guide both the first traveling wind A1 flowing under the vehicle and the second traveling wind A2 flowing from the engine room 6 through the floor tunnel 4 to the vehicle rear X2.

[0031] The amount of protrusion H (i.e., the height of the protrusion 22) of the lowermost portion 22d1, which is the lowest part of the underside 22d of the protrusion 22 shown in FIG. 4, from the underside 21a of the base 21 may be an amount of protrusion (e.g., about 2 cm) that enables the protrusion 22 to guide the first running wind A1 to flow below the lower end 9a of the catalyst 9, as shown in FIG. 7.

[0032] The protrusion 22 has a generally spindle shape or a triangular shape with two bulging sides that narrows toward the front X1 of the vehicle as seen from the bottom of the vehicle, as shown in Fig. 3. Specifically, the protrusion 22 has a front portion 22a, a middle portion 22b, and a rear end portion 22c in the vehicle front-rear direction X, as shown in Figs.

[0033] The front portion 22a has a shape that narrows toward the vehicle front X1 in a bottom view of the vehicle (a so-called tapered shape). The middle portion 22b has a shape that extends to the same width or slightly wider in the vehicle front-rear direction X. As shown in FIG. 5, in a side view of the vehicle, the front portion 22a is inclined downward toward the vehicle rear X2, so that the first traveling wind A1 flowing under the vehicle can be smoothly guided downward. Note that it is sufficient for the middle portion 22b to extend in the vehicle front-rear direction X while maintaining the same height or slightly descending.

[0034] In this embodiment, as shown in FIGS. 7 to 9, the protrusion 22 has an upward extension 22f provided at a rear end portion 22c in the vehicle front-rear direction X so as to extend upward Z1 from a lower surface 22d of the protrusion 22.

[0035] 3-4 and 8, the lower surface 22d and the upward extension 22f of the protrusion 22 are arc-shaped when viewed from the rear of the vehicle. The width (dimension in the width direction Y) of the protrusion 22 is set to be wider than the width of the lower end 9a of the catalyzer 9, so that the first traveling wind A1 flows downward over the entire width of the lower end 9a of the catalyzer 9, thereby making it possible to suppress an increase in air resistance.

[0036] As shown in Figures 3 to 6, in the vehicle fore-and-aft direction X, the rear end of the base 21 of the tunnel undercover 8 is formed with a pair of upward raised portions 23 and a pair of rearward protruding portions 24 on both sides of the convex portion 22 in the width direction Y.

[0037] The pair of upper raised portions 23 protrude upward Z1 from the upper surface 21b of the base 21, and are capable of guiding the second running wind A2 flowing above the tunnel undercover 8 to gather at the convex portions 22 on both sides of the width direction Y of the convex portions 22.

[0038] The pair of rear protrusions 24 are formed to protrude from the rear end of the base 21 toward the vehicle rear X2. A plurality of bolt holes 25 are formed at the tips of the pair of rear protrusions 24 and on the periphery of the base 21. Bolts 26 protruding downward from the frame 2 side shown in FIG. 1 are inserted into each of the plurality of bolt holes 25, and nuts are fastened to the bolts 26, thereby making it possible to fix the tunnel undercover 8 to the underside of the frame 2.

[0039] 2 and 7 to 9, the tunnel undercover 8 of this embodiment is disposed so as to have the following positional relationship relative to the lower end 9a of the catalyzer 9. That is, the lower surface 21a of the base 21 is disposed above Z1 the lower end 9a of the catalyzer 9 in a side view of the vehicle.

[0040] The protrusion 22 is disposed at a predetermined interval in front of the catalyzer 9 in the vehicle front-rear direction X1 in a side view of the vehicle. The "predetermined interval" here refers to an interval at which the first traveling wind A1 and the second traveling wind A2 interfere with each other, and does not fall under the "predetermined interval" when the first traveling wind A1 and the second traveling wind A2 are separated by an amount that does not cause interference between them.

[0041] The lowermost portion 22d1 of the lower surface 22d, which is the lowest portion of the arc-shaped protrusion 22, is formed to be above the lower end portion 9a of the catalyzer 9 at Z1 and below the lower surface 21a of the base portion 21 at Z2.

[0042] 2 and 7-8, the catalyzer 9 is disposed inside the floor tunnel 4 at a position X2 rearward of the vehicle from the tunnel undercover 8. The catalyzer 9 has the above-mentioned lower end 9a that protrudes downward Z2 from the lower end of the floor tunnel 4.

[0043] A first curved surface 9b is formed at an end portion of the catalyzer 9 on the vehicle front X1 side, and extends in a direction Z2 that descends from the vehicle front X1 toward the vehicle rear X2 in a side view of the vehicle.

[0044] A second curved surface 9c is formed at the end of the catalyzer 9 on the vehicle rear X2 side, and extends in an upward direction Z1 from the vehicle front X1 toward the vehicle rear X2 in a side view of the vehicle. The curvature of the second curved surface 9c is set to be larger than the curvature of the first curved surface 9b.

[0045] (Features of this embodiment) (1) 3 to 6, in the undercarriage structure of the vehicle 1 of this embodiment, the tunnel undercover 8 is composed of a flat plate-shaped base 21 and a protruding portion 22. The protruding portion 22 protrudes downward Z2 from the base 21, so that the first traveling wind A1 (see FIGS. 7 and 9) flowing under the vehicle is directed toward the downward direction Z2 of the catalyzer 9.

[0046] That is, in this embodiment, as shown in Fig. 2 and Fig. 7, the tunnel undercover 8 has the convex portion 22, so that the first traveling wind A1 can be guided along the lower line L2, which is the height of the lower surface 22d of the convex portion 22, and can flow smoothly under the lower end portion 9a of the catalyzer 9, and it is possible to suppress an increase in air resistance. On the other hand, in a comparative example in which the convex portion 22 is not provided, the first traveling wind A1 flows along the upper line L1, which is the height of the lower surface 21a of the base portion 21, and hits the lower end portion 9a of the catalyzer 9 protruding downward from the line L1, and therefore the air resistance increases. Even when comparing these points, it is clear that the convex portion 22 contributes to the effect of suppressing air resistance.

[0047] In this embodiment, as shown in Figs. 7 and 9, the lowermost portion 22d1 of the lower surface 22d, which is the lowermost portion of the protrusion 22, is formed to be above the lower end portion 9a of the catalyzer 9 at Z1 and below the lower surface 21a of the base portion 21 at Z2, so that the opening area of ​​the gap 27 formed between the protrusion 22 and the catalyzer 9 is limited. That is, the opening area of ​​this gap 27 is narrower than the opening area of ​​the gap when the lowermost portion 22d1 of the protrusion 22 is below the lower end portion 9a of the catalyzer 9 at Z2. Therefore, the two winds guided by the tunnel undercover 8, that is, the first traveling wind A1 flowing through the lower portion of the vehicle and the second traveling wind A2 from the engine room 6, are less likely to collide in the gap 27 between the protrusion 22 and the catalyzer 9, and the first and second traveling winds A2 can be made to flow along the catalyzer 9 toward the rear of the vehicle X2. As a result, even in a configuration in which the catalyzer 9 has a lower end portion 9a located below the tunnel undercover 8 at Z2, it is possible to suppress an increase in air resistance during vehicle travel.

[0048] (2) In the undercarriage structure of the vehicle 1 of this embodiment, as shown in Figures 7 and 9, a first curved surface 9b is formed at the end of the catalyst 9 on the vehicle front X1 side, which extends in a downward direction Z2 from the vehicle front X1 to the vehicle rear X2 in a side view of the vehicle.

[0049] According to this configuration, the second traveling wind A2 on the floor tunnel 4 side guided to the vehicle rear X2 by the tunnel undercover 8 can flow smoothly along the first curved surface 9b of the catalyzer 9 to the lower end 9a of the catalyzer 9. Therefore, it is possible to suppress obstruction of the flow of the second traveling wind A2.

[0050] (3) 7, in the undercarriage structure of the vehicle 1 of this embodiment, a second curved surface 9c is formed at the end of the catalyzer 9 on the vehicle rear X2 side, the second curved surface 9c extending in an upward direction Z1 from the vehicle front X1 toward the vehicle rear X2 in a side view of the vehicle. The curvature of the second curved surface 9c is set to be larger than the curvature of the first curved surface 9b.

[0051] According to this configuration, the curvature of the second curved surface 9c formed at the end of the catalyzer 9 on the vehicle rear X2 side is set to be larger than that of the first curved surface 9b. Therefore, the traveling wind flowing from the tunnel undercover 8 to the vehicle rear X2 along the lower end 9a of the catalyzer 9 (specifically, the traveling wind after the first traveling wind A1 and the second traveling wind A2 join together) is easily separated from the second curved surface 9c and is less likely to flow into the floor tunnel 4 along the second curved surface 9c. Therefore, it is possible to suppress the inflow of the traveling wind into the floor tunnel 4 without impeding the flow of the traveling wind to the vehicle rear X2.

[0052] (4) In the undercarriage structure of the vehicle 1 of this embodiment, as shown in Figs. 7 and 9, the protrusion 22 has an upward extension portion 22f provided so as to extend upward Z1 at a rear end portion 22c in the vehicle front-rear direction X.

[0053] According to this configuration, the upward extension portion 22f extends upward Z1 at the rear end portion 22c of the protrusion 22. The upward extension portion 22f guides the second traveling wind A2 from the engine room 6 in a direction inclined toward the vehicle rear X2 and downward Z2 just before entering the gap 27 between the protrusion 22 and the catalyzer 9, so that the second traveling wind A2 can merge at an acute angle with the first traveling wind A1 flowing under the vehicle. Moreover, the upward extension portion 22f further narrows the gap 27 between the protrusion 22 and the catalyzer 9, so that the first traveling wind A1 and the second traveling wind A2 are even less likely to collide with each other in the gap 27. Therefore, the two actions of the upward extension portion 22f, which are the acute angle merger of the traveling winds and the narrowing of the gap 27, can further suppress an increase in air resistance during vehicle travel.

[0054] Moreover, the upward extension portion 22f of this embodiment extends in a direction slightly inclined toward the vehicle rear X2 along with the upward direction Z1. Moreover, the upper end edge of the upward extension portion 22f protrudes toward the vehicle rear X2. This allows the first traveling wind A1 and the second traveling wind A2 to merge at a sharper angle and further narrow the gap 27, as compared to a case in which the upward extension portion 22f simply extends upward Z1, and further improves the effect of suppressing an increase in air resistance.

[0055] (5) In the underbody structure of the vehicle 1 of this embodiment, the lower surface 22d of the protruding portion 22 is arc-shaped when viewed from the rear of the vehicle, as shown in Figures 4 and 8. With this configuration, the first traveling wind A1 flowing under the vehicle smoothly flows toward the vehicle rear X2 along the arc-shaped lower surface 22d of the protruding portion 22, so that it is possible to further suppress an increase in air resistance when the vehicle is traveling.

[0056] (6) 3, in the underbody structure of the vehicle 1 of this embodiment, the front portion 22a of the protrusion 22 in the vehicle longitudinal direction X has a shape that narrows toward the vehicle front X1 (so-called tapered shape) in a bottom view of the vehicle. With this configuration, when the first traveling wind A1 flowing under the vehicle hits the front portion 22a having the tapered shape, the traveling wind is dispersed in the width direction of the protrusion 22 and is less likely to hit the catalyzer 9, so that it is possible to further suppress an increase in air resistance when the vehicle is traveling.

[0057] (Modification) (A) In the above embodiment, an automobile having an engine 5 as a drive source has been described as an example of a vehicle to which the vehicle underbody structure of the present invention is applied, but the present invention is not limited thereto, and may be an electric vehicle or a hybrid car having a motor as a drive source. In that case, a battery or the like is applied as an on-vehicle component provided in the lower part of the vehicle instead of the above-mentioned catalyzer 9. Even in such an electric vehicle or the like in which the lower end of the battery protrudes downward from a battery storage section (on-vehicle component storage section) that is open to the bottom of the vehicle, the application of the vehicle underbody structure of the present invention makes it possible to achieve the effects described in (1) to (6) above (Features of this embodiment).

[0058] (B) Furthermore, even in the case of an automobile equipped with an engine 5 as in the above embodiment, another example of the on-vehicle part of the present invention may be another part housed in the floor tunnel 4, such as a pre-silencer 10, instead of the above-mentioned catalyzer 9. In that case, too, it is possible to achieve the effects described in (1) to (6) above (Features of this embodiment). [Explanation of symbols]

[0059] 1 vehicle 4 Floor tunnel (vehicle parts storage area) 5 Engine (power source) 6 Engine room (space) 8 Tunnel undercover (undercover) 9 Catalyzer (vehicle parts) 9a Lower end 9b 1st surface 9c 2nd surface 10 Silencer 11 Exhaust pipe 21 Base 21a Bottom side 22 Convex 22a Front part 22c rear end part 22d Bottom surface 22d1 Bottom 22e Upper extension part 27 Gap 60 Engine housing (drive source housing) A1 First running wind A2 2nd running wind

Claims

1. A vehicle underbody structure including a drive source housing having a space capable of housing a drive source of the vehicle at a front side of the vehicle, an in-vehicle part storage section formed in a lower portion of the vehicle rearward of the drive source storage section, extending in a front-rear direction of the vehicle and opening downward; an undercover disposed in a position rearward of the space so as to close a part of a lower open portion of the vehicle-mounted part storage unit, and configured to guide both a first traveling wind flowing under the vehicle and a second traveling wind flowing from the space through the vehicle-mounted part storage unit toward the rear of the vehicle; an on-vehicle component disposed inside the on-vehicle component storage portion at a position rearward of the undercover, the on-vehicle component having a lower end protruding downward beyond a lower end of the on-vehicle component storage portion; Equipped with The undercover includes a flat base and a protrusion protruding downward from the base, a lower surface of the base is disposed higher than a lower end of the on-vehicle component in a side view of the vehicle, The protrusion is disposed in front of the on-vehicle component at a predetermined interval in a vehicle front-rear direction in a vehicle side view, a lowermost portion of the protrusion is formed to be higher than the lower end portion of the on-vehicle component and lower than the lower surface of the base; A vehicle underbody structure comprising:

2. The vehicle underbody structure according to claim 1, A first curved surface is formed on an end portion of the on-vehicle component on a vehicle front side, the first curved surface extending in a downward direction from the front to the rear of the vehicle in a side view of the vehicle. A vehicle underbody structure comprising:

3. The vehicle underbody structure according to claim 2, A second curved surface is formed on an end portion of the on-vehicle component on the vehicle rear side, the second curved surface extending in an upward direction from the front to the rear of the vehicle in a side view of the vehicle, The curvature of the second curved surface is set to be larger than the curvature of the first curved surface. A vehicle underbody structure comprising:

4. The vehicle underbody structure according to any one of claims 1 to 3, The protrusion has an upward extension portion provided so as to extend upward at a rear end portion in the vehicle front-rear direction. A vehicle underbody structure comprising:

5. In the vehicle underbody structure according to any one of claims 1 to 4, a lower surface of the convex portion is arc-shaped when seen from the rear of the vehicle. A vehicle underbody structure comprising:

6. The vehicle underbody structure according to any one of claims 1 to 5, A front portion of the convex portion in the vehicle front-rear direction has a shape that narrows toward the front of the vehicle in a bottom view of the vehicle. A vehicle underbody structure comprising:

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