Cowling structure of straddle-type vehicle and straddle-type vehicle

1. A straddle-type vehicle, comprising:

a vehicle body; and

a cowling structure provided to cover a front portion of the vehicle body, the cowling structure including a front cowling and a tubular portion that forms an air passage through which air flows,

the tubular portion including:

a front opening forming section formed with a front opening which opens frontward in the vehicle body;

a rear opening forming section formed with a rear opening which is placed rearward relative to the front opening and opens to a rear in the vehicle body;

an inclined wall which is placed between a lower portion of the front opening forming section and a lower portion of the rear opening forming section, extends in a forward and rearward direction, and includes an inclined surface inclined to be higher as the inclined surface extends in a rearward direction; and

an outer side wall protruding upward from an outer side portion of the inclined wall in a vehicle width direction of the vehicle body and extending in the forward and rearward direction, wherein

the tubular portion is provided on an outer surface on the front cowling, and the rear opening forming section of the tubular portion terminates at a front side of a rear edge of the front cowling;

the inclined surface of the inclined wall has a shape in which a dimension in the forward and rearward direction is greater than a dimension in a vertical direction; and

the tubular portion has a passage cross-section of a vertically elongated shape.

2. The straddle-type vehicle according to claim 1 ,

wherein the cowling structure includes a wind deflecting section which diverts air flowing toward a rider to an outward region in the vehicle width direction,

wherein the inclined wall is provided at the wind deflecting section.

3. The straddle-type vehicle according to claim 1 ,

wherein the cowling structure includes a swelling section which is provided at the outer side portion in the vehicle width direction, and swells gradually in an outward direction of the vehicle width direction from a front end of the swelling section toward a rear portion of the swelling section, when viewed from above,

wherein the inclined wall is placed inward in the vehicle width direction of the vehicle body relative to the swelling section.

4. The straddle-type vehicle according to claim 3 ,

wherein an outer side surface of the outer side portion and an outer side surface of the outer side wall, in the vehicle width direction of the vehicle body, are formed as a common surface.

5. The straddle-type vehicle according to claim 1 ,

wherein the cowling structure includes a guide section which is provided in front of the front opening and guides air in such a manner that the air which reaches a region that is in front of the front opening is gathered at the front opening.

6. The straddle-type vehicle according to claim 5 ,

wherein the guide section is placed inward in the vehicle width direction of the vehicle body relative to the front opening.

7. A straddle-type vehicle, comprising:

a vehicle body; and

a cowling structure provided to cover a front portion of the vehicle body, the cowling structure including:

a front opening forming section formed with a front opening which opens frontward in the vehicle body;

a rear opening forming section formed with a rear opening which is placed rearward relative to the front opening and opens to a rear in the vehicle body;

an inclined wall which is placed between a lower portion of the front opening forming section and a lower portion of the rear opening forming section, extends in a forward and rearward direction, and includes an inclined surface inclined to be higher as the inclined surface extends in a rearward direction; and

an outer side wall protruding upward from an outer side portion of the inclined wall in a vehicle width direction of the vehicle body and extending in the forward and rearward direction,

wherein the cowling structure includes a guide section which is provided in front of the front opening and guides air in such a manner that the air which reaches a region that is in front of the front opening is gathered at the front opening,

wherein the guide section is placed inward in the vehicle width direction of the vehicle body relative to the front opening,

wherein the cowling structure includes an introduction port forming section formed with an introduction port which is located in front of the front opening and opens to an inside in the vehicle width direction of the vehicle body, and

wherein the introduction port forming section deflects the air guided by the guide section to flow to an outward region in the vehicle width direction, toward the front opening.

8. The straddle-type vehicle according to claim 1 ,

wherein the front opening has an opening area smaller than an opening area of the rear opening.

9. The straddle-type vehicle according to claim 1 ,

wherein the vehicle body includes a steering handle provided with a grip,

wherein the cowling structure is configured to include an aerodynamic device which generates a downforce, and

wherein the aerodynamic device is set to be as high as the grip, and is located in front of the grip.

10. The straddle-type vehicle according to claim 9 ,

wherein the aerodynamic device is mounted to a swelling section of the cowling structure, the swelling section being configured to swell in an outward direction of the vehicle width direction.

11. The straddle-type vehicle according to claim 1 ,

wherein the cowling structure is configured to include an aerodynamic device which generates a downforce, and

wherein the aerodynamic device is provided at each of side portions of the cowling structure in the vehicle width direction.

12. The straddle-type vehicle according to claim 3 , further comprising:

a windshield supported by the cowling structure,

wherein a rear end portion of the inclined wall is located rearward relative to the windshield.

13. The straddle-type vehicle according to claim 3 ,

wherein the vehicle body includes a vehicle body frame and a front fork provided at a front portion of the vehicle body frame, and

wherein a rear end portion of the inclined wall extends to a location of the front fork in the forward and rearward direction.

14. The straddle-type vehicle according to claim 3 ,

wherein the vehicle body includes a vehicle body frame and a front fork provided at a front portion of the vehicle body frame,

wherein the cowling structure includes side cowlings for covering the vehicle body on right and left sides of the front fork, respectively, and

wherein the inclined wall is integrated with an inner side surface of each of the side cowlings.

15. A straddle-type vehicle, comprising:

a vehicle body; and

a cowling structure provided to cover a front portion of the vehicle body, the cowling structure including:

a front opening forming section formed with a front opening which opens frontward in the vehicle body;

a rear opening forming section formed with a rear opening which is placed rearward relative to the front opening and opens to a rear in the vehicle body;

an inclined wall which is placed between a lower portion of the front opening forming section and a lower portion of the rear opening forming section, extends in a forward and rearward direction, and includes an inclined surface inclined to be higher as the inclined surface extends in a rearward direction; and

an outer side wall protruding upward from an outer side portion of the inclined wall in a vehicle width direction of the vehicle body and extending in the forward and rearward direction,

wherein the cowling structure includes a guide section which is provided in front of the front opening and guides air in such a manner that the air which reaches a region that is in front of the front opening is gathered at the front opening,

wherein the cowling structure includes an introduction port forming section formed with an introduction port which is located in front of the front opening and opens to an inside in the vehicle width direction of the vehicle body, and

wherein the introduction port forming section deflects the air guided by the guide section to flow to an outward region in the vehicle width direction, toward the front opening.

16. The straddle-type vehicle according to claim 15 ,

wherein the cowling structure includes a wind deflecting section which diverts air flowing toward a rider to the outward region in the vehicle width direction, and

wherein the inclined wall is provided at the wind deflecting section.

17. The straddle-type vehicle according to claim 15 ,

wherein the cowling structure includes a swelling section which is provided at the outer side portion in the vehicle width direction, and swells gradually in an outward direction of the vehicle width direction from a front end of the swelling section toward a rear portion of the swelling section, when viewed from above, and

wherein the inclined wall is placed inward in the vehicle width direction of the vehicle body relative to the swelling section.

18. The straddle-type vehicle according to claim 17 ,

wherein an outer side surface of the outer side portion and an outer side surface of the outer side wall, in the vehicle width direction of the vehicle body, are formed as a common surface.

19. The straddle-type vehicle according to claim 15 ,

wherein the front opening has an opening area smaller than an opening area of the rear opening.