JP7374777B2 - duct - Google Patents

Description

The present disclosure relates to a duct that takes in air when a vehicle is running and discharges the air taken in from a front portion inside a tire house diagonally rearward and outward.

In order to reduce air resistance when the vehicle is running, side protectors and bumper aero parts for sports specifications guide air from the front part of the tire house diagonally to the rear and outside to cover the side openings of the tire house. A device that forms a so-called air curtain is known (for example, see Patent Document 1).

Patent No. 6172123 (paragraph [0053], Figure 4)

However, even in non-sports spec vehicles, there is a demand for the development of aero parts that can guide air as described above from the perspective of improving fuel efficiency. Therefore, an object of the present disclosure is to provide a duct that can be attached to a vehicle independently of a side protector or bumper and can suppress air resistance when the vehicle is running.

The invention of claim 1, which has been made to solve the above problem, guides the air taken in at a position in front of the tire house of the vehicle to the front part of the tire house, and from there the air is guided to the front part of the tire house. A duct wall discharging outward, the duct wall comprising a lower end duct portion disposed overlappingly on the lower surface of the vehicle at the lower end of a vertically elongated duct portion extending vertically along the front portion of the tire house. an air intake port formed in the lower end duct portion and opening toward the front side; and a vertically long air discharge port formed in the vertically elongated duct portion and discharging air toward the outside of the tire house diagonally rearward. It is a duct equipped with.

A second aspect of the present invention is the duct according to the first aspect, wherein the lower end duct portion extends in the lateral direction of the vehicle, and the vertically elongated duct portion rises upward from one end thereof.

In the invention according to claim 3, the air intake port is arranged so that air is taken in toward one side in the vertical direction in the lower end duct part, and the vertically elongated duct part has a vertically elongated duct body part extending in the vertical direction. 3. The duct according to claim 1, further comprising a lead-out portion extending diagonally rearward from the longitudinally elongated duct main body, and a tip of the lead-out portion serving as the air discharge port.

The invention according to claim 4 is the duct according to claim 3, wherein the longitudinally elongated duct main body has a circular cross section, and the inner circumferential surface of the elongated duct main body and the inner surface of the lead-out portion are continuous.

In the invention according to claim 5, the lower end duct portion includes a lower end duct main body portion extending in the lateral direction, and an introduction portion projecting forward from the lower end duct main body portion, and the tip of the introduction portion is connected to the air intake. The duct according to claim 3 or 4, wherein the duct is an inlet.

The invention according to claim 6 is the duct according to claim 5, wherein the lower end duct main body has a circular cross section, and the inner circumferential surface of the lower end duct main body and the inner surface of the introduction part are continuous. .

According to a seventh aspect of the invention, the introduction part is arranged closer to the upper side of the lower end duct body part, and the lead-out part is arranged closer to the upper side of the longitudinal duct body part from the side of the longitudinal duct body part away from the side opening of the tire house. The duct according to claim 5 or 6, which projects toward the side opening side of the tire house.

According to an eighth aspect of the invention, the air taken in from the air intake port flows into the vertically elongated duct part while swirling, and the air flows in the direction in which the swirling progresses from a position near one side of the vertically long duct part in the horizontal direction. 8. The duct according to any one of claims 3 to 7, wherein the air discharge port is arranged so that the air is discharged.

The invention according to claim 9 is the duct according to any one of claims 1 to 8, which includes a mounting piece that extends laterally from the lower end duct portion and is fixed to the lower surface of the vehicle with a bolt or a rivet. be.

The invention according to claim 10 is the duct according to any one of claims 1 to 9, which is a blow molded product.

The duct wall of the duct according to the first aspect includes a lower end duct portion disposed overlappingly on the lower surface of the vehicle at the lower end of the longitudinally elongated duct portion extending in the vertical direction along the front portion of the tire house. Then, the air taken in from below the vehicle by the air intake port in the lower end duct is discharged diagonally to the outside of the tire house from the air discharge port in the vertical duct part, thereby covering the side opening of the tire house. It is possible to create an air flow (so-called air curtain), and it is possible to reduce air resistance when the vehicle is running. That is, according to the duct of the present disclosure, it can be attached to a vehicle regardless of the side protector or bumper, and it is possible to suppress air resistance when the vehicle is running.

In the configuration of claim 2, the lower end duct portion is extended in the lateral direction of the vehicle, the air intake port is made horizontally elongated, and the lower end duct portion can be made compact in the vertical direction, and the amount of protrusion from the lower surface of the vehicle can be suppressed. becomes possible.

Here, the air intake port may be formed over the entire lower end duct part in the vertical direction, or as in the structure of claim 3, the air intake port may be formed at one side in the vertical direction within the lower end duct part. It may also be a configuration formed by. Moreover, the shape may be circular or polygonal (including triangles and quadrilaterals).

The vertically long duct portion may have a configuration in which an air discharge port is formed on the outer surface of the vertically long duct body, or, as in the configuration of claim 3, the vertically long duct portion may include a lead-out portion extending obliquely to the rear side from the vertically long duct body. , the tip of the outlet may be an air outlet. With the configuration of claim 3, it becomes possible to stabilize the flow direction of the air discharged from the air discharge port.

According to the configuration of claim 4, it is possible to smoothly guide air from the vertically long duct main body to the outlet portion.

According to the configuration of claim 5, it is possible to guide the taken-in air to the lower end duct main body portion while aligning the flow direction of the air.

According to the structure of claim 6, it becomes possible to smoothly guide air from the introduction part to the lower end duct main body part.

Here, the introduction part and the lead-out part are arranged so that the introduction part is brought to the lower side of the lower end duct body, and the lead-out part is arranged from the side of the vertical duct body close to the side opening of the tire house to the side opening of the tire house. Alternatively, as in the structure of claim 7, the introduction part may be placed closer to the upper side of the lower end duct main body, and the lead-out part may be protruded from the side opening of the tire house in the longitudinal duct main body. The structure may be such that it projects from the remote side toward the side opening of the tire house.

Like the duct of claim 8, by swirling the air taken in and discharging the air in the direction of the swirl, the above-mentioned air curtain can be moved in the vertical direction, as confirmed from the simulation results of the examples described later. It becomes possible to expand.

The duct may be attached to the vehicle by welding or gluing, or, as in the configuration of claim 9, a mounting piece is provided that projects laterally from the lower end duct portion and attached to the vehicle with bolts or rivets. It may be a configuration.

The duct may be made of metal or resin. If it is made of resin, it may be, for example, an injection molded product or, as in the structure of claim 10, a blow molded product. When manufactured by blow molding, the blow molding material has a relatively high molecular weight compared to the molding material used in injection molding, so it has excellent impact strength in cold weather. Moreover, when provided on the underside of a vehicle, the duct becomes highly resistant to impacts such as flying stones.

A perspective view of a duct according to an embodiment Front view of duct Duct side view Top view of duct (A) AA sectional view in Figure 3, (B) BB sectional view in Figure 4 Cross-sectional view of the duct installed on the vehicle Perspective view of invention B in Example Simulation results when invention A is viewed from the front side Simulation results when invention A is viewed from the side Simulation results when invention A is viewed from the top side Simulation results for the C-C section in Figure 4 Simulation results when invention B is viewed from the front side Simulation results when invention B is viewed from the side Simulation results when invention B is viewed from the top side Simulation results for the DD section in Figure 7 A perspective view of a duct according to a modified example

Embodiments of the present disclosure will be described below with reference to FIGS. 1 to 15. As shown in FIG. 1, the duct wall 10H of the duct 10 of this embodiment has a substantially L-shaped duct body portion 11. The duct main body 11 has a circular cross section, and the inner diameter is uniform throughout the duct main body 11. Further, both ends of the duct main body 11 are closed by end walls 12 and 13. Hereinafter, the direction in which the L-shaped horizontal side of the duct main body 11 in FIG. 1 extends will be referred to as the horizontal direction H1 of the duct 10. In addition, the direction perpendicular to the horizontal direction H1 and going from the left side to the right back side in FIG. 1 is called the front-rear direction H2 of the duct 10, and the "left side" in FIG. ” is referred to as the “rear side.” Furthermore, the vertical direction in FIG. 1 is referred to as the vertical direction H3 of the duct 10. Note that the lateral direction H1, the longitudinal direction H2, and the vertical direction H3 of the duct 10 coincide with the longitudinal, horizontal, vertical, and vertical directions of the vehicle 90 when it is mounted on the vehicle 90, which will be described later.

The corner portion 14 of the L-shape of the duct body 11 is arcuate, and the lower end duct body 15 corresponding to the lateral side of the L-shape extends straight in the lateral direction H1. On the other hand, as shown in FIG. 3, the vertically long duct main body 16 corresponding to the vertical side of the L-shape extends diagonally upward with a slight incline toward the rear from the corner 14, and then bends slightly rearward. It further inclines to the rear and extends obliquely upward.

Note that the arc-shaped corner portion 14 is a part shared by the lower end duct body portion 15 and the vertically elongated duct body portion 16. That is, it can be said that the lower end duct main body part 15 is provided at the lower end of the vertically long duct main body part 16, and it can also be said that the vertically long duct main body part 16 rises upward from one end part of the lower end duct main body part 15. Alternatively, the duct main body 11 may have a configuration in which the lower end duct main body 15 branches from the lower part of the vertically long duct main body 16, as shown in FIG. 16, without having the corner portion 14.

As shown in FIG. 1, the lower end duct main body portion 15 is provided with an introduction portion 20 that projects toward the front side. The introduction section 20 has a horizontally long rectangular cross section and is uniform in size in the axial direction.

As shown in FIG. 2, the introduction section 20 is disposed above the lower end duct main body section 15 in the vertical direction H3 and closer to the end wall 12 side in the horizontal direction H1. As a result, the upper wall 21 of the introduction section 20 smoothly continues to the outer circumferential wall of the lower end duct main body section 15, and the side wall 22 communicates flush with the end wall 12. On the other hand, the lower wall 23 of the introduction part 20 is located slightly below the central axis 15J of the lower end duct main body 15, and communicates with the lower end duct main body 15 so as to intersect therewith. Further, as shown in FIG. 4, the end of the side wall 24 on the side of the lower end duct main body 15 is curved and communicates with the lower end duct main body 15. Note that the end wall 12 extends in a direction perpendicular to the central axis 15J so that the front side of the central axis 15J of the lower end duct main body 15 is flush with the side wall 21 of the introduction part 20, while the rear side of the central axis 15J extends. It's curved.

As shown in FIG. 1, a pair of attachment pieces 25 are provided at the tip of the introduction section 20, projecting in the lateral direction H1. The mounting piece 25 extends flush with the upper wall 21 and has a mounting hole 26 .

The introduction portion 20 has an air intake port 27 whose tip is open toward the front. In this embodiment, as described above, the introduction part 20 has a horizontally long rectangular cross section, and accordingly, the air intake port 27 also has a horizontally long rectangular shape. The mouth 27 may be, for example, a vertically long rectangle, a square, or a circle. Further, the air intake port 27 may have a widened funnel-like shape at the tip in order to stably guide the intake air to the introduction section 20.

The air taken into the air intake port 27 is guided by the introduction part 20 and heads toward the lower end duct body part 15. Here, the inner surface of the upper wall 21 of the introduction section 20 is smoothly continuous with the inner surface of the lower end duct main body section 15, as shown in FIG. 5(B). In other words, the inner surface of the upper wall 21 is arranged on a tangent to the upper point P1 that intersects the vertically extending center line 15C of the inner circumferential surface of the lower end duct main body 15. The inner surface of the upper wall 21 extends in the tangential direction of the inner circumferential surface of the lower end duct main body portion 15 . Thereby, air is smoothly guided from the introduction part 20 to the lower end duct main body part 15.

Furthermore, the air flowing into the lower end duct main body 15 is taken in toward the upper side of the lower end duct main body 15 in the vertical direction H3. Then, guided by the inner circumferential surface of the lower end duct main body 15, it heads toward the vertically elongated duct main body 16 while turning clockwise in the direction of travel.

As shown in FIG. 1, the elongated duct main body portion 16 is provided with a lead-out portion 30. As shown in FIG. 3, the lead-out portion 30 is disposed from a slightly bent portion of the vertically long duct main body portion 16 to the tip thereof, and has a vertically long rectangular cross section. As shown in FIG. 4, the lead-out portion 30 extends diagonally rearward from a position near one side of the horizontal direction H1 of the vertically long duct main body 16, which is the side on which the lower end duct main body 15 extends, toward the other side. It is extending. The extending direction of this lead-out portion 30 is along the flow of air that rotates clockwise toward the traveling direction (see FIG. 5(A)). Further, as shown in FIG. 3, the lead-out part 30 has a central axis 30J extending parallel to the horizontal direction, and its tip end in a plane parallel to the central axis 16J of the portion of the elongated duct main body 16 that the lead-out part 30 communicates with. It has a shape that looks like it has been cut.

As shown in FIG. 4, in the lead-out portion 30, a side wall 31 facing toward the side where the lower end duct main body portion 15 extends in the horizontal direction H1 is smoothly continuous with the outer circumferential wall of the vertically elongated duct main body portion 16. On the other hand, a side wall 32 opposite to the side wall 31 communicates with the outer circumferential wall of the vertically long duct body 16 so as to intersect therewith. Further, the lead-out portion 30 is connected such that the upper wall 33 is slightly bent from the outer edge of the end wall 13 . Note that the end wall 13 is sloped slightly upward from the front side toward the rear side.

Air flowing from the lower end duct main body part 15 heads from the vertically long duct main body part 16 to the outlet part 30. Here, the inner surface of the side wall 31 of the lead-out portion 30 is smoothly continuous with the inner surface of the longitudinally elongated duct main body 16, as shown in FIG. 5(A). In other words, the inner surface of the side wall 31 is located on the inner surface of the vertically elongated duct main body 16 at the rear side of the center line 16C1 extending in the horizontal direction H1 and from the center line 16C2 extending in the front-rear direction H2 in FIG. 5(A). It is placed on the tangent to the upper point P2. The inner surface of the side wall 31 extends in the tangential direction of the inner circumferential surface of the longitudinally elongated duct main body portion 16 . Thereby, air is smoothly guided from the vertically long duct main body part 16 to the outlet part 30.

The leading-out portion 30 has an air discharge port 37 at its tip. The air discharged from the air discharge port 37 is discharged obliquely to the rear side along the central axis 30J of the outlet portion 30.

The duct 10 is made of resin (for example, polyethylene (HDPE, LDPE), polypropylene (PP), etc.), and is manufactured by, for example, blow molding. Note that the duct 10 is not limited to a blow molded product, and may be an injection molded product or may be manufactured by other manufacturing methods. Further, the duct 10 is not limited to being made of resin, and may be made of metal. When manufactured by blow molding, the blow molding material has a relatively high molecular weight compared to the molding material used in injection molding, so it has excellent impact strength in cold weather. Moreover, when provided on the underside of the vehicle 90, the duct 10 has excellent impact resistance against flying stones and the like.

In addition, in this embodiment, the vertically long duct main body part 16 and the lead-out part 30 correspond to the "vertically long duct part" in the claims, and the lower end duct main body part 15 and the introduction part 20 correspond to the "lower end" in the claims. This corresponds to the duct section.

The configuration of the duct 10 of this embodiment is as described above. Next, the effects of the duct 10 of this embodiment will be explained. As shown in FIGS. 3 and 6, the duct 10 of this embodiment is stacked on the lower surface 91 of the vehicle 90 such that the lower end duct main body 15 extends in the lateral direction of the vehicle 90, and the vertically elongated duct main body 16 They are stacked so as to extend in the vertical direction of the vehicle 90 along the front portion of the vehicle 93 . Then, bolts or rivets are attached to the attachment holes 26 of the pair of attachment pieces 25 and fixed to the vehicle 90. Then, in the duct 10, the introduction part 20 extends in the longitudinal direction of the vehicle 90, the air intake port 27 opens to the front, and the outlet part 30 extends from the side away from the side opening 93K of the tire house 93 to the side opening 93K side. It will be in a state of protrusion.

When the vehicle 90 runs, air is taken in from the air intake port 27 and flows from the lower end duct body portion 15 to the vertically elongated duct body portion 16, and as shown in FIG. It is discharged diagonally backward along the . Then, it flows to the outside of the tire house 93 from between the side opening 93K of the tire house 93 and the front outer edge of the tire 92.

In this way, according to the duct 10 of this embodiment, it is possible to create an air flow (so-called air curtain) that covers the tire house 93 from the outside, and it is possible to reduce air resistance when the vehicle is running. Become. That is, according to the duct 10 of this embodiment, it can be attached to the vehicle 90 regardless of the side protector or the bumper, and it becomes possible to suppress air resistance when the vehicle is running.

In the duct 10 of this embodiment, the lower end duct main body 15 can be extended in the lateral direction of the vehicle 90 and the air intake port 27 can be made horizontally elongated, so that the lower end duct main body 15 can be made compact in the vertical direction H3. It becomes possible to suppress the amount of protrusion from the lower surface 91. Moreover, as can be confirmed from the simulation results of the examples described later, by making the air intake port 27 horizontally long, it becomes possible to take in air widely and evenly.

In addition, in the duct 10 of the present embodiment, the air intake port 27 is arranged closer to one side (in detail, the upper side) of the lower end duct main body 15 in the vertical direction H3, and the air taken in is transferred to the lower end duct main body 15. It heads toward the vertically elongated duct main body part 16 while being guided by the inner circumferential wall of the duct. The air discharge port 37 is arranged so that air is discharged from a position near one side in the horizontal direction H1 of the vertically long duct main body 16 (specifically, the side on which the lower end duct main body 15 extends) in the rotating direction. has been done. This makes it possible to expand the above-mentioned air curtain in the vertical direction H3, as can be confirmed from the simulation results of the examples described later.

Moreover, in the present embodiment, since the lead-out portion 30 projects obliquely to the rear side from the vertically long duct main body portion 16, it is possible to stabilize the flow direction of the air discharged from the air discharge port 37. In addition, since the inner circumferential surface of the vertically long duct main body 16 having a circular cross section and the inner surface of the side wall 31 of the outlet section 30 are continuous on a tangential line, air is smoothly guided from the vertically long duct main body 16 to the outlet section 30. It becomes possible to do so.

Moreover, in this embodiment, since the introduction part 20 is projected forward from the lower end duct main body part 15, it becomes possible to guide the introduced air to the lower end duct main body part 15 with the flow direction aligned. In addition, since the inner circumferential surface of the lower end duct main body 15 having a circular cross section and the inner surface of the upper wall 21 of the introduction section 20 are continuous on a tangential line, the flow direction of the taken in air is aligned and the lower end duct main body 15 It will be possible to guide you.

[Example]
A simulation analysis was conducted to confirm the effectiveness of the duct of the present disclosure.
1. Simulation Analysis (A) A fluid analysis simulator was used to analyze the air flow and the spread of air discharged from the air outlet in Invention A and Invention B.
Note that invention A corresponds to the duct 10 of the above embodiment. Inventive product B is shown in FIG. 7, and although the opening area of the air intake port and air outlet is the same as that of invention A, the shape of the air intake port is vertically elongated, and the air intake port has a vertically elongated shape. This differs from Invention A in that the leading-out portion of the invention projects diagonally rearward from the position where the outer circumferential wall of the longitudinally elongated duct main body and the center line extending in the longitudinal direction H2 of the elongated duct main body intersect.

A. Experimental conditions (1) Comparison of invention A and invention B Invention A: Air intake 18 x 48 [mm], air outlet 10 x 90 [mm]
Duct body inner diameter φ32 [mm]
Invention B: Air intake 32 x 27 [mm], air outlet 10 x 90 [mm]
Duct body inner diameter φ32 [mm]

(2) Analysis conditions Air temperature: 23 [℃]
Wind speed: 37 [km/hour]
Air volume: 32 [m ³ / hour]

B. Experimental Results FIGS. 8 to 10 and 12 to 14 show air flows when Invention A and Invention B are viewed from the front, side, and top sides. FIGS. 11 and 15 show the flow velocity distribution of air discharged from the air outlet of invention A and invention B.

It can be seen from FIGS. 10 and 14 that in both invention products A and B, air is taken into the air intake port from a wide range in the lateral direction H1. Furthermore, it can be seen that compared to invention B, invention A can take in air more evenly into the air intake port. It can be seen from FIGS. 9 and 13 and FIGS. 10 and 14 that the invention A is easier to swirl the air within the lower end duct main body than the invention B. Further, from the comparison between FIG. 8 and FIG. 12 and the comparison between FIG. 9 and FIG. 13, it can be seen that compared to invention B, the air swirls more cleanly in invention A from the corner to the longitudinally elongated duct main body.

It can be seen from FIGS. 10 and 14 that in both inventions A and B, the air discharged from the air discharge port is discharged diagonally backward and away from the lower end duct main body. In addition, compared to Invention B, in Invention A, the air discharged from the air outlet does not spread in the lateral direction H1, but flows in a straight line, and is discharged toward the side farther away from the lower end duct body. I can see that it is being done. It can be seen from FIGS. 9 and 13 and FIGS. 11 and 15 that in both invention products A and B, the air discharged from the air discharge port spreads in the vertical direction H3. It can also be seen that, compared to Inventive Product B, Inventive Product A has a larger spread in the vertical direction H3 of the air discharged from the air outlet, and less unevenness. From this, it can be seen that in both inventions A and B, the air taken in can be discharged diagonally backward to the side away from the lower end duct main body to create a so-called air curtain. Furthermore, it can be seen that, compared to invention B, invention A can create an air curtain that expands more widely in the vertical direction H3.

[Other embodiments]
(1) In the above embodiment, the lower end duct body portion 15 extends in the horizontal direction H1, but the lower end duct body portion 15 may extend in the front-rear direction H2.

(2) In the above embodiment, the lead-out portion 30 protrudes from the vertically long duct main body 16, but the air discharge port is formed in the outer peripheral wall of the vertically long duct main body 16 without providing the lead-out portion 30. It may be a configuration. Similarly, the introduction part 20 was configured to protrude from the lower end duct main body 15, but instead of providing the introduction part 20, the air intake port was formed in the outer peripheral wall of the lower end duct main body 15. Good too.

(3) In the above embodiment, the duct main body 11 has a circular cross section, but the duct main body 11 may have a rectangular cross section, or may have a shape in which the corners of the rectangle are rounded. Moreover, the duct main body part 11 does not have to be uniform throughout the duct main body part 11.

(4) In the above embodiment, as shown in FIG. 5(A), the lead-out part 30 is connected to the vertically long duct so that the inner surface of the side wall 31 of the lead-out part 30 smoothly communicates with the inner circumferential surface of the vertically long duct main body part 16. Although the air is connected to the main body 16, if the air can be discharged diagonally to the rear outside of the tire house 93 from the air outlet 37 of the outlet 30, for example, the inner surface of the side wall 31 of the outlet 30 can be connected to the elongated duct main body. It may be configured to communicate so as to intersect with the inner circumferential surface of the portion 16 (see FIG. 7).

(5) In addition, the air discharge port 37 is formed by cutting the tip of the outlet portion 30 along a plane parallel to the center line 16C1 extending in the horizontal direction H1 of the vertically long duct main body portion 16, as shown in FIG. 5(A). Although the configuration is open to the rear side, for example, the tip of the lead-out portion 30 shown in FIG. 5(A) may be cut in a plane perpendicular to the central axis 30J and opened diagonally to the rear side. .

(6) In the duct 10, the introduction part 20 is arranged below the lower end duct main body part 15 in the vertical direction H3, and the lead-out part 30 is arranged so that the lower end duct main part 15 in the horizontal direction H1 of the vertically long duct main body part 16 It may also be configured to protrude from the side opposite to the extending side toward the side further away from the lower end duct main body portion 15. The configuration of the embodiment described above in which the introduction part 20 is arranged closer to the upper side of the lower end duct main body part 15 in the vertical direction H3 allows the air intake port 27 to be separated from the ground.

(7) In the above embodiment, the duct 10 is fixed to the vehicle 90 by the mounting piece 25, but it may be fixed by adhesive, for example. Further, for example, when the duct 10 is made of metal, it may be fixed by welding.

10 Duct 10H Duct wall 15 Lower end duct main body part 16 Vertical duct main body part 20 Introductory part 25 Mounting piece 27 Air intake port 30 Outlet part 37 Air discharge port

Claims (10)

A duct that guides air taken in at a position in front of the tire house of the vehicle to the front part of the tire house and discharges it diagonally rearward from there to the outside of the tire house,
a duct wall comprising a lower end duct portion disposed overlappingly on the lower surface of the vehicle at the lower end of a vertically elongated duct portion extending vertically along the front portion of the tire house;
an air intake port formed in the lower end duct portion and opening toward the front side;
A duct comprising: a vertically long air discharge port formed in the vertically long duct portion and discharging air diagonally to the outside of the tire house. The duct according to claim 1, wherein the lower end duct portion extends in the lateral direction of the vehicle, and the vertically elongated duct portion rises upward from one end thereof. The air intake port is arranged so that air is taken in toward one side in the vertical direction within the lower end duct portion,
The vertically long duct portion includes a vertically long duct main body that extends in the vertical direction, and a lead-out portion that projects diagonally backward from the vertically long duct main body, and a tip of the lead-out portion serves as the air discharge port. The duct according to claim 1 or 2. 4. The duct according to claim 3, wherein the longitudinally elongated duct main body has a circular cross section, and an inner circumferential surface of the elongated duct main body and an inner surface of the lead-out portion are continuous. The lower end duct portion includes a lower end duct body portion extending in the lateral direction, and an introduction portion projecting forward from the lower end duct body portion, and a tip of the introduction portion is the air intake port. The duct according to item 3 or 4. 6. The duct according to claim 5, wherein the lower end duct body has a circular cross section, and the inner peripheral surface of the lower end duct body is continuous with the inner surface of the introduction part. The introduction part is arranged closer to the upper side of the lower end duct main body part,
The duct according to claim 5 or 6, wherein the lead-out portion protrudes from a side of the longitudinally elongated duct main body portion away from the side opening of the tire house toward the side opening of the tire house. Air taken in from the air intake port flows into the vertically elongated duct part while swirling,
According to any one of claims 3 to 7, the air discharge port is arranged so that air is discharged from a position closer to one side in the horizontal direction of the vertically elongated duct portion in the direction in which the turning progresses. duct. The duct according to any one of claims 1 to 8, further comprising a mounting piece projecting laterally from the lower end duct portion and fixed to the lower surface of the vehicle with bolts or rivets. The duct according to any one of claims 1 to 9, which is a blow molded product.

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