JP7451933B2 - Vehicle undercarriage - Google Patents

Description

The present invention relates to a vehicle lower structure.

While a vehicle is running, a wind is generated in which the air in front of the wheels relatively flows toward the rear of the wheels, and when the wind hits the wheels, running resistance increases. Therefore, various lower structures for vehicles have been devised to prevent wind from hitting the wheels.

For example, as in the lower structure of a vehicle disclosed in Patent Documents 1 and 2, a rear deflector is generally provided in front of the rear tires and has a vertical wall portion extending in the vehicle width direction to block the wind while the vehicle is running. By providing the rear deflector in front of the rear tires, the running wind first hits the rear deflector in front of the rear tires and is blocked. This suppresses aerodynamic drag caused by the wind hitting the rear tires.

JP2017-74905A Patent No. 5522254

From the perspective of improving vehicle design, a design that makes the rear tires more visible from the outside can be considered. However, in order to make the rear tires more visible from the outside, if the outer end of the rear deflector is placed further inward in the vehicle width direction than the outer end of the rear tire, the wind will be directed towards the outer end of the rear tire. This makes it difficult to maintain the performance of suppressing aerodynamic drag (i.e., aerodynamic performance).

The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a lower structure for a vehicle that can maintain both aerodynamic performance and improve the design of the vehicle.

In order to solve the above problems, the lower structure of a vehicle of the present invention has a rear wheel disposed on the rear side and lower side of the vehicle on both sides of the vehicle body in the vehicle width direction, and a rear wheel disposed on the front side of the rear wheel. a deflector; and a floor undercover provided below the floor of the vehicle body, the deflector having a vertical wall portion extending in the vehicle width direction, and an end portion of the vertical wall portion on the outside in the vehicle width direction. , the floor undercover is located inward in the vehicle width direction from the outer end of the rear wheel in the vehicle width direction, and the floor undercover includes a side wall portion extending in the longitudinal direction of the vehicle and a portion of the side wall portion on the rear side of the vehicle. a bulge that bulges outward in the vehicle width direction; the bulge has a front surface facing toward the front of the vehicle; and a rear surface facing toward the rear of the vehicle; the front surface is located within the vehicle width of the deflector; A deflection surface portion for directing the traveling wind is formed on the front surface of the deflector, and the deflection surface portion and the deflector are arranged at a position such that a gap is formed between the deflection surface portion and the deflector when viewed from the front. and the rear surface is formed by an offset surface that extends inward and rearward in the vehicle width in a plan view and is located on the vehicle rear side of the bulge portion and the front of the vehicle with respect to the rear surface of the floor undercover that faces toward the rear of the vehicle. It is characterized by being formed.

In this configuration, the outer end of the vertical wall portion of the deflector is located further inward in the vehicle width direction than the outer end of the rear wheel, making the rear wheel more visible from the outside and improving the design of the vehicle. . On the other hand, a floor undercover is provided below the floor of the vehicle body, and the floor undercover has a side wall extending in the longitudinal direction of the vehicle and a portion of the side wall on the rear side of the vehicle that bulges outward in the vehicle width direction. It has a bulge. The bulge has a front surface facing toward the front of the vehicle and a rear surface facing toward the rear of the vehicle. The front surface forms a deflection surface portion that directs the traveling wind toward the front surface of the deflector, inward and forward of the vehicle width of the deflector. That is, the floor undercover has a deflection surface portion that directs the traveling wind toward the front surface of the deflector, inward and in front of the deflector in the vehicle width. With this configuration, the wind generated while the vehicle is running is directed outward of the vehicle width of the floor undercover by the deflector's inner and front deflection surface. It is possible to guide the vehicle widthwise outward. As a result, even if the outer end of the vertical wall of the deflector is located further inward in the vehicle width direction than the outer end of the rear wheel, the performance of suppressing aerodynamic drag (i.e., aerodynamic performance) can be maintained. It is possible. As a result, it becomes possible to both maintain aerodynamic performance and improve vehicle design.
In the vehicle lower structure described above, the floor undercover has a side wall portion extending in the longitudinal direction of the vehicle, and a bulge portion that bulges outward in the vehicle width direction at a portion of the side wall portion on the rear side of the vehicle. The deflection surface portion is formed by the front surface of the bulge portion facing toward the front of the vehicle.
In this configuration, since the side wall portion of the floor undercover guides the traveling wind to the deflection surface portion on the vehicle front side than the deflection surface portion, it becomes possible to smoothly guide more travel wind to the deflection surface portion. Thereby, it is possible to improve the effect of guiding the traveling wind received by the vertical wall portion of the deflector outward in the vehicle width direction, and to maintain aerodynamic performance more reliably.
Moreover, since the deflecting surface portion is integrally formed with the bulging portion, the structure of the floor undercover is simplified and damage and deformation of the deflecting surface portion can be suppressed.
Further, in the vehicle lower structure described above, the deflection surface section and the deflector are arranged at a position where a gap is formed between the deflection surface section and the deflector when viewed from the front. The bulge has a rear surface that faces toward the rear of the vehicle in plan view and extends inward and rearward in the vehicle width. The rear surface of the bulge is formed by an offset surface located toward the front of the vehicle with respect to the rear surface of the floor undercover facing toward the rear of the vehicle.
With this configuration, it is possible to guide the wind flowing toward the rear of the vehicle through the gap between the deflection surface section and the vertical wall section of the deflector in a front view toward the inside of the vehicle along the offset surface forming the rear surface of the bulge. . This makes it possible to further reduce the wind hitting the rear wheels and maintain aerodynamic performance more reliably.

In the vehicle lower structure described above, it is preferable that the deflection surface portion extends toward an inner end in the vehicle width direction of the vertical wall portion.

In such a configuration, the wind generated while the vehicle is running is guided toward the inner end in the vehicle width direction of the vertical wall portion of the deflector by the deflection surface portion of the deflector on the inner and front side in the vehicle width direction, and further The entire width of the vehicle in the vehicle width direction is guided outward in the vehicle width direction.Therefore, it becomes possible to more smoothly guide the traveling wind received by the vertical wall part in the outward direction of the vehicle width. As a result, it is possible to maintain aerodynamic performance more reliably.

In the vehicle lower structure described above, it is preferable that an outer end in the vehicle width direction of the deflection surface portion overlaps an inner end in the vehicle width direction of the rear wheel in the vehicle width direction when viewed from the front of the vehicle.

With such a configuration, it is possible to extend the deflection surface portion to the outside of the vehicle width and to extend closer to the vertical wall portion of the deflector. As a result, it is possible to further enhance the effect of guiding the traveling wind to the vertical wall portion by the deflection surface portion, and to maintain aerodynamic performance more reliably.

In the vehicle undercarriage structure described above, a flange portion is formed at a peripheral edge of the floor undercover, the flange portion is fixed to the floor portion of the vehicle body by a plurality of fixing portions spaced apart from each other, and the deflection surface portion is connected to the adjacent Preferably, it extends outward in the vehicle width direction so as to intersect the line segment connecting the fixing portions.

With such a configuration, the deflection surface portion can be extended to the flange portion of the periphery of the floor cover under, and can be extended closer to the vertical wall portion of the deflector. As a result, it is possible to further enhance the effect of guiding the traveling wind to the vertical wall portion by the deflection surface portion, and to maintain aerodynamic performance more reliably.

In the vehicle lower structure described above, the lower end of the outer end in the vehicle width direction of the deflection surface portion is at the same height as or lower than the lower end of the inner end in the vehicle width direction of the vertical wall portion of the deflector. Preferably, it is located in

In this configuration, the wind guided toward the vertical wall of the deflector by the deflection surface hits the entire vertical wall in the vertical direction, so the entire surface of the vertical wall has the function of guiding the wind outward in the width direction of the vehicle. It is possible to effectively demonstrate this. This makes it possible to maintain aerodynamic performance more reliably.

In the vehicle lower structure described above, it is preferable that a drainage hole is formed in the rear surface of the bulge facing toward the rear of the vehicle.

In this configuration, the drainage hole is formed on the rear surface of the bulge that bulges outward in the vehicle width from the side wall of the floor undercover. Thereby, water accumulated inside the floor undercover can flow backward along the side wall portion and be smoothly discharged to the outside of the cover from the drainage hole of the bulging portion.
In the vehicle lower structure described above , the rear surface of the floor undercover facing toward the rear of the vehicle has a portion that extends continuously from the rear end of the rear surface of the bulging portion to a position inward in the vehicle width direction from the side wall portion. is preferable.

According to the vehicle lower structure of the present invention, it is possible to both maintain aerodynamic performance and improve the design of the vehicle.

FIG. 1 is a perspective view of the main part of the lower structure of the vehicle according to the embodiment of the present invention, viewed from the lower left. FIG. 2 is a perspective view of the main part of the lower structure of FIG. 1 viewed diagonally from below. FIG. 2 is an enlarged bottom view of the rear tire, the deflector, and the bulge portion having the deflection surface portion shown in FIG. 1; FIG. 2 is a perspective view of the floor undercover of FIG. 1 viewed diagonally from above. FIG. 2 is an enlarged sectional view of the vehicle body shown in FIG. 1 taken in the vehicle width direction in front of a bulging portion. 6 is a cross-sectional explanatory view schematically showing a configuration in which a battery is arranged above the floor undercover of FIG. 5. FIG. FIG. 3 is a perspective view of a main part of a vehicle body of a type in which a battery is not mounted, which is a lower structure of a vehicle according to another embodiment of the present invention, as viewed from the lower left. FIG. 8 is an enlarged cross-sectional view of the vehicle body of FIG. 7 taken in the vehicle width direction in front of the bulge. 9 is a cross-sectional explanatory view schematically showing a configuration in which a battery is arranged above the floor undercover of FIG. 8. FIG.

Hereinafter, one preferred embodiment of the present invention will be described in detail with reference to the accompanying drawings.

As shown in FIGS. 1 to 3, the lower structure of the vehicle of this embodiment includes side sills 2 arranged on both sides of the vehicle body 1 in the vehicle width direction Y and extending in the vehicle longitudinal direction X, and a vehicle rear side X2 of the side sills 2. a rear fender 3 disposed on the rear fender 3, a rear tire 4 (rear wheel) housed in the rear fender 3, a deflector 5 disposed on the front side X1 of the rear tire 4, and a lower part of the floor 6 (floor panel) of the vehicle body 1. The floor under cover 7 is provided in the floor under cover 7. The rear tires 4 are arranged on both sides of the vehicle body 1 in the vehicle width direction Y on the vehicle rear side X2 and on the lower side.

As shown in FIGS. 3 and 5, the deflector 5 has a vertical wall portion 5a and an attached portion 5e that is attached to the lower surface 2a of the side sill 2 (see FIGS. 2 and 3) with bolts or the like. The deflector 5 has a vertical wall portion 5a and an attached portion 5e integrally formed of, for example, resin.

The vertical wall portion 5a is located in front X1 of the rear tire 4, extends downward from the lower surface 2a of the side sill 2, and extends in the vehicle width direction Y.

Furthermore, the end 5b of the vertical wall portion 5a on the outer side Y1 in the vehicle width direction is located further inward Y2 in the vehicle width direction than the end 4a of the rear tire 4 on the outer side Y1 in the vehicle width direction.

As shown in FIGS. 1 to 6, the floor undercover 7 is a cover having a depth capable of accommodating the battery 8, and has side wall portions 10 extending in the vehicle longitudinal direction X on both sides of the vehicle width direction Y. A flange portion 20 is formed at the periphery of the floor undercover 7. The flange portion 20 is fixed to the floor portion 6 (floor panel) of the vehicle body 1 by a plurality of fixing portions 13 (see FIG. 3). The fixing portion 13 includes, for example, a stud bolt provided on the floor portion 6 and a nut screwed onto the stud bolt.

As shown in FIG. 6, by fixing the floor undercover 7 to the floor 6 of the vehicle body 1, the battery 8 is accommodated in the floor undercover 7 at the lower part of the vehicle body 1. This allows the large battery 8 to be housed in the lower part of the vehicle body 1. Therefore, the vehicle lower structure of this embodiment can be applied to electric vehicles, hybrid vehicles, and the like.

As shown in FIGS. 1 to 5, the floor undercover 7 has a deflection surface portion 12 that directs the traveling wind W1 to the front surface of the deflector 5 at the vehicle width inner side Y2 and the front side X1 of the deflector 5.

In the present embodiment, as shown in FIGS. 1 to 4, the side wall portion 10 of the floor undercover 7 is a portion of the side wall portion 10 on the vehicle rear side X2 (in the present embodiment, the rear end portion of the side wall portion 10). It has a bulging portion 11 that bulges outward in the vehicle width direction Y. The deflection surface portion 12 is formed by the front surface of the bulge portion 11 facing toward the vehicle front X1.

As shown in FIG. 3, the deflection surface portion 12 is continuous with the rear end of the side wall portion 10, and smoothly curves and extends toward the rear of the vehicle X2 and the vehicle width outward Y1. Thereby, it is possible to guide the traveling wind W1 flowing toward the rear of the vehicle X2 along the side wall portion 10 to the rear of the vehicle X2 and to the outside of the vehicle width Y1 by the deflection surface portion 12.

As shown in FIGS. 3 and 5, the deflection surface portion 12 extends toward an end portion 5c of the vertical wall portion 5a on the inner side Y2 in the vehicle width direction.

In addition, when viewed from the front of the vehicle, an end 12a of the deflection surface portion 12 on the outer side Y1 in the vehicle width direction overlaps an end 4b of the rear tire 4 on the inner side Y2 in the vehicle width direction in the vehicle width direction Y.

In this embodiment, as shown in FIG. 3, the flange portion 20 at the peripheral edge of the floor undercover 7 is fixed by a plurality of fixing portions 13, but in order to bring the deflection surface portion 12 closer to the deflector 5, The deflection surface portion 12 extends outward in the vehicle width direction Y so as to intersect with a line segment 14 connecting adjacent fixing portions 13 .

Further, as shown in FIG. 5, the lower end 12b of the end 12a of the deflection surface portion 12 on the outer side Y1 in the vehicle width direction is the same as the lower end 5d of the end 5c of the vertical wall portion 5a of the deflector 5 on the inner side Y2 in the vehicle width direction. located at or below the height.

As shown in FIGS. 3 and 4, the deflection surface section 12 and the deflector 5 are arranged at a position where a gap is formed between the deflection surface section 12 and the deflector 5 when viewed from the front. The bulging portion 11 has a rear surface 17 facing toward the rear of the vehicle X2. The rear surface 17 extends toward the vehicle width inward Y2 and rearward X2 in plan view . The rear surface 17 is formed by an offset surface 19 located toward the vehicle front X1 with respect to the rear surface 15 of the floor undercover 7 facing toward the vehicle rear X2. As shown in FIG. 3, the offset surface 19 is arranged at a position shifted toward the front of the vehicle X1 from the rear surface 15 with an offset step 16 interposed between the offset surface 19 and the rear surface 15 of the floor undercover 7. (offset).

Furthermore, a drainage hole 18 is formed in the rear surface 17 of the bulging portion 11 to drain water accumulated inside the floor undercover 7.

(Features of this embodiment)
(1)
As shown in FIGS. 1 to 3, the lower structure of the vehicle of this embodiment includes a rear tire 4 disposed on the rear side X2 and lower side of the vehicle on both sides of the vehicle body 1 in the vehicle width direction Y, and The vehicle includes a deflector 5 disposed on the front side X1 of the vehicle body 1, and a floor undercover 7 provided below the floor portion 6 of the vehicle body 1. The deflector 5 has a vertical wall portion 5a extending in the vehicle width direction Y. The end portion 5b of the vertical wall portion 5a on the outer side Y1 in the vehicle width direction is located further inward Y2 in the vehicle width direction than the end portion 4a of the rear tire 4 on the outer side Y1 in the vehicle width direction. The floor undercover 7 has a deflection surface portion 12 that directs the traveling wind W1 to the front surface of the deflector 5 at the vehicle width inner side Y2 and the front side X1 of the deflector 5.

In the above configuration, the outer end 5b of the vertical wall portion 5a of the deflector 5 is located further inward in the vehicle width direction Y2 than the outer end 4a of the rear tire 4, so the rear tire 4 is easily visible from the outside. Improved vehicle design. On the other hand, a floor undercover 7 is provided below the floor 6 of the vehicle body 1, and the floor undercover 7 directs the traveling wind W1 to the front surface of the deflector 5 at the vehicle width inner side Y2 and the front X1 of the deflector 5. It has a deflection surface section 12 that allows the deflection surface to move. In this configuration, the running wind W1 generated while the vehicle is running is directed to the vehicle width inner side Y2 of the deflector 5 and to the vehicle width outer side Y1 of the floor undercover 7 by the front deflection surface portion 12. It is possible to guide the running wind W1 received by the wall portion 5a to the outside of the vehicle width Y1. As a result, even if the outer end of the vertical wall portion 5a of the deflector 5 is located further inward in the vehicle width direction Y2 than the outer end of the rear tire 4 (that is, the width of the vertical wall portion 5a in the vehicle width direction Y is Even if it is small), it is possible to maintain the performance of suppressing aerodynamic drag (i.e., aerodynamic performance). As a result, it becomes possible to both maintain aerodynamic performance and improve vehicle design.

(2)
In the vehicle lower structure of this embodiment, as shown in FIGS. 3 and 5, the deflection surface portion 12 extends toward the end portion 5c of the vertical wall portion 5a on the inner side Y2 in the vehicle width direction. In this configuration, the running wind W1 generated while the vehicle is running is directed to the end 5c of the vertical wall portion 5a of the deflector 5 on the inner side Y2 in the vehicle width direction by the deflection surface portion 12 on the inner side Y2 in the vehicle width direction and the front X1 of the deflector 5. The vehicle is further guided toward the outer side of the vehicle width Y1 by the entire width of the vertical wall portion 5a in the vehicle width direction Y. Therefore, the traveling wind W1 received by the vertical wall portion 5a is smoothly guided by the outer side of the vehicle width Y1. It becomes possible to do so. As a result, it is possible to maintain aerodynamic performance more reliably.

(3)
In the vehicle lower structure of the present embodiment, as shown in FIGS. 3 and 5, when viewed from the front of the vehicle, the end portion 12a of the deflection surface portion 12 on the outer side Y1 in the vehicle width direction is located on the inner side Y2 of the rear tire 4 in the vehicle width direction. It overlaps with the end portion 4b in the vehicle width direction Y. With this configuration, it is possible to extend the deflection surface portion 12 to the vehicle width outward direction Y1, and to extend it closer to the vertical wall portion 5a of the deflector 5. As a result, it is possible to further enhance the effect of the deflection surface section 12 in guiding the traveling wind W1 to the vertical wall section 5a, and to maintain aerodynamic performance more reliably.

(4)
In the vehicle lower structure of this embodiment, as shown in FIGS. 3 and 4, a flange portion 20 is formed at the periphery of the floor undercover 7. As shown in FIGS. The flange portion 20 is fixed to the floor portion 6 of the vehicle body 1 by a plurality of fixing portions 13 spaced apart from each other. The deflection surface portion 12 extends outward in the vehicle width direction Y so as to intersect with a line segment 14 connecting adjacent fixing portions 13 .

With this configuration, it is possible to extend the deflection surface portion 12 to the flange portion 20 at the peripheral edge of the floor cover under 7, and to extend it closer to the vertical wall portion 5a of the deflector 5. As a result, it is possible to further enhance the effect of the deflection surface section 12 in guiding the traveling wind W1 to the vertical wall section 5a, and to maintain aerodynamic performance more reliably.

(5)
In the vehicle lower structure of this embodiment, as shown in FIG. The end portion 5c is located at the same height as the lower end 5d or at a lower height.

In this configuration, since the traveling wind W1 guided toward the vertical wall portion 5a of the deflector 5 by the deflection surface portion 12 hits the entire vertical wall portion 5a in the vertical direction, the traveling wind W1 is directed toward the vehicle by the entire surface of the vertical wall portion 5a. It is possible to effectively exhibit the function of guiding to the width outside Y1. This makes it possible to maintain aerodynamic performance more reliably.

(6)
In the vehicle lower structure of this embodiment, as shown in FIGS. 1 to 4, the floor undercover 7 has a side wall portion 10 extending in the vehicle longitudinal direction X. As shown in FIGS. The side wall portion 10 has a bulging portion 11 that bulges outward in the vehicle width direction Y at a portion of the side wall portion 10 on the vehicle rear side X2 (in this embodiment, the rear end portion of the side wall portion 10). . The deflection surface portion 12 is formed by the front surface of the bulge portion 11 facing toward the vehicle front X1.

In this configuration, the side wall portion 10 of the floor undercover 7 guides the traveling wind W1 to the deflecting surface portion 12 on the vehicle front side X1 relative to the deflecting surface portion 12, so that more traveling wind W1 is smoothly guided to the deflecting surface portion 12. becomes possible. Thereby, it is possible to improve the effect of guiding the traveling wind W1 received by the vertical wall portion 5a of the deflector 5 outward in the vehicle width direction Y, and to maintain aerodynamic performance more reliably.

Furthermore, since the deflection surface portion 12 is integrally formed with the bulge portion 11, the structure of the floor undercover 7 is simplified and damage and deformation of the deflection surface portion 12 can be suppressed.

(7)
In the vehicle lower structure of this embodiment, as shown in FIGS. 3 and 4, the deflection surface section 12 and the deflector 5 are located at a position where a gap is formed between the deflection surface section 12 and the deflector 5 when viewed from the front. It is located. The bulging portion 11 has a rear surface 17 that faces toward the rear of the vehicle X2 in plan view and extends toward the vehicle width inward Y2 and rearward X2. The rear surface 17 of the bulging portion 11 is formed by an offset surface 19 located toward the vehicle front X1 with respect to the rear surface 15 of the floor undercover 7 facing toward the vehicle rear X2.

In this configuration, the traveling wind W2 flowing toward the rear of the vehicle X2 through the gap between the deflection surface portion 12 and the vertical wall portion 5a of the deflector 5 in a front view is directed toward the inside of the vehicle along the offset surface 19 forming the rear surface 17 of the bulge portion 11. It is possible to guide them to Y2. Thereby, it is possible to further reduce the running wind W2 hitting the rear tires 4 and maintain aerodynamic performance more reliably.

(8)
In the vehicle lower structure of this embodiment, as shown in FIGS. 3 and 4, a drainage hole 18 for draining water accumulated inside the floor undercover 7 is provided on the rear surface 17 of the bulging portion 11 facing toward the rear of the vehicle X2. It is formed. In this configuration, the drainage hole 18 is formed in the rear surface 17 of the bulge portion 11 that bulges out further in the vehicle width direction Y1 than the side wall portion 10 of the floor undercover 7. Thereby, the water accumulated inside the floor undercover 7 can flow backward along the side wall part 10 and be smoothly discharged from the drainage hole 18 of the bulging part 11 to the outside of the cover.

(Modified example)
(A)
In the embodiment shown in FIGS. 1 to 6 above, the lower structure of the vehicle is shown in which the battery 8 is mounted between the floor section 6 (floor panel) of the vehicle body 1 and the floor undercover 7. The invention is not limited to this.

As a modification of the present invention, as shown in FIGS. 7 to 9, the lower structure of the vehicle may not be equipped with the battery 8. In the structure of this modification, since the battery 8 is not mounted, it is possible to form the floor undercover 7 with a narrow width in the vertical direction (with a flatter shape). As a result, the vertical width of the side wall portion 10 of the floor undercover 7 and the bulging portion 11 having the deflection surface portion 12 is reduced.

Therefore, in the modified examples shown in FIGS. 7 to 9, the vertical width of the deflection surface section 12 is slightly smaller than the vertical width of the deflector 5, but the other configurations are similar to those shown in FIGS. It has the same structure as . Therefore, in the modified examples shown in FIGS. 7 to 9, it is possible to similarly achieve the effects other than (5) among (1) to (8) of the above (features of the present embodiment).

(B)
Note that the rear tire 4 of the above embodiment is an example of the rear wheel of the present invention, and the rear wheel of the present invention is not limited to a wheel having a tire. Therefore, the rear wheel of the present invention includes, for example, an integrally molded wheel made of resin or metal. That is, the present invention can be widely applied to vehicles equipped with a deflector in front of the rear wheels. Therefore, for example, the present invention can be applied not only to electric cars and gasoline cars but also to railway vehicles.

1 Vehicle body 4 Rear tire (rear wheel)
4a Outer end 4b Inner end 5 Deflector 5a Vertical wall 5b Outer end 5c Inner end 5d Lower end 6 Floor 7 Floor undercover 8 Battery 10 Side wall 11 Expansion 12 Deflection surface 12a Outer end 12b Lower end 13 Fixed portion 14 Line segment 15 Rear surface 17 Rear surface 18 Drain hole 19 Offset surface 20 Flange portion

Claims (7)

Rear wheels arranged on the rear side and lower side of the vehicle on both sides in the vehicle width direction of the vehicle body;
a deflector arranged on the front side of the rear wheel;
a floor undercover provided below the floor of the vehicle body,
The deflector has a vertical wall portion extending in the vehicle width direction,
The outer end in the vehicle width direction of the vertical wall portion is located further inward in the vehicle width direction than the outer end in the vehicle width direction of the rear wheel,
The floor undercover has a side wall portion extending in the longitudinal direction of the vehicle, and a bulging portion bulging outward in the vehicle width direction at a portion of the side wall portion on the rear side of the vehicle,
The bulge has a front surface facing the front of the vehicle and a rear surface facing the rear of the vehicle,
The front surface forms a deflection surface portion that directs the traveling wind toward the front surface of the deflector, inwardly and in front of the deflector in a vehicle width direction,
The deflection surface portion and the deflector are arranged at a position where a gap is formed between the deflection surface portion and the deflector when viewed from the front,
The rear surface is formed by an offset surface that extends inward and rearward in the width of the vehicle in a plan view and is located on the vehicle rear side of the bulge and in front of the vehicle with respect to the rear surface of the floor undercover that faces toward the rear of the vehicle. The undercarriage of the vehicle. The deflection surface portion extends toward an inner end in the vehicle width direction of the vertical wall portion.
The vehicle undercarriage structure according to claim 1. When viewed from the front of the vehicle, an outer end in the vehicle width direction of the deflection surface portion overlaps an inner end in the vehicle width direction of the rear wheel in the vehicle width direction;
The vehicle lower structure according to claim 1 or 2. A flange portion is formed at a peripheral edge of the floor undercover,
The flange portion is fixed to a floor portion of the vehicle body by a plurality of fixing portions spaced apart from each other,
The deflection surface portion extends outward in the vehicle width direction so as to intersect a line segment connecting the adjacent fixed portions.
The vehicle lower structure according to any one of claims 1 to 3. The lower end of the outer end in the vehicle width direction of the deflection surface portion is located at the same height as or lower than the lower end of the inner end in the vehicle width direction of the vertical wall portion of the deflector.
The vehicle lower structure according to any one of claims 1 to 4. A drainage hole is formed in the rear surface of the bulge facing toward the rear of the vehicle.
The vehicle undercarriage structure according to claim 1. The rear surface of the floor undercover facing toward the rear of the vehicle has a portion that extends continuously from the rear end of the rear surface of the bulging portion to a position inside in the vehicle width direction from the side wall portion.
The vehicle undercarriage structure according to claim 1.

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