JPH0656060A - Air introducing structure of cowling for motorcycle - Google Patents

Abstract

PURPOSE:To introduce sufficient running air and further to decrease running resistance as compared with an opening area of an opening, in the case of forming the opening for introducing running air in a side cowl. CONSTITUTION:A side cowl 18 for covering a car body side surface from sideward externally is provided. An opening 25 is formed in this side cowl 18. A single duct 28 for guiding running air 27, introduced to the opening 25 from externally sideward of the above side cowl 18, to a predetermined position inside a car body is provided. The opening 25 is constituted of a plurality of air introducing ports 31 provided along an outside surface of the side cowl 18.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an air introduction structure for a cowling for a motorcycle, which introduces traveling wind flowing outside the side cowls into the inside of a vehicle body.

[0002]

2. Description of the Related Art Conventionally, as an air introduction structure for a cowling for a motorcycle, for example, there is one disclosed in Japanese Utility Model Laid-Open No. 62-173290. According to this, the cowling has the side cowl that covers the side surface of the vehicle body from the outside, and the opening is formed in the side cowl. Also,
Same as above, one duct is provided for guiding the traveling wind introduced from the outside of the side cowl to the opening to a predetermined position inside the vehicle body. Also, since there is only one opening for each duct, a certain amount of traveling wind is introduced through this opening, and this opening is widened in the vehicle width direction when viewed from the front of the vehicle body. The opening area in front view is increased.

[0003]

The traveling wind on the outer side of the side cowl vigorously flows rearward along the outer surface of the side cowl. Therefore, when the opening is wide as described above, the traveling wind is Flows into the inside of the vehicle body with a large amount of flow passing through the outside of the opening in the vehicle width direction, while at the inside of the opening in the vehicle width direction, since the opening is wide as described above, Since the curvature of the side cowl outer surface reaching the opening becomes large, separation of the inflowing air layer occurs here and turbulent flow occurs. Therefore, it does not work sufficiently as a passage for introducing traveling wind, that is, there is a problem that the amount of traveling wind introduced is small compared to the opening area.
There is also the problem of increased running resistance.

[0004]

SUMMARY OF THE INVENTION The present invention has been made by paying attention to the above-mentioned circumstances. When an opening for introducing traveling wind is formed in the side cowl, the opening area of this opening is sufficient compared with the opening area. The purpose is to introduce traveling wind and reduce traveling resistance.

[0005]

In order to achieve the above object, the present invention is characterized in that a side cowl for covering the side surface of a vehicle body from the outside is provided and an opening is formed in the side cowl. In an air introduction structure of a cowling for a motorcycle, which is provided with one duct for guiding the traveling wind introduced from the outside to the opening to a predetermined position inside the vehicle body, the opening is formed along the outside surface of the side cowl. It is composed of a plurality of air inlets provided as a unit.

[0006]

[Operation] The operation of the above configuration is as follows. An opening 25 is formed in the side cowl 18 and the same as above.
In the case where a single duct 28 for guiding the traveling wind 27 introduced from the outside of 8 to the opening 25 to a predetermined position inside the vehicle body is provided, the opening 25 is provided along the outside surface of the side cowl 18. Multiple air inlets 3
It is composed of 1. Therefore, even if the opening area of each air introduction port 31 is reduced, it is possible to secure a sufficient opening area as a whole in a front view. Then, in this case, since the size of each air introduction port 31 in the vehicle width direction can be reduced,
The traveling wind 27 that vigorously flows rearward along the outer side surface of the side cowl 18 flows into the duct 28 side through the respective parts of the air introduction ports 31 as a whole. Further, since the dimension of each air inlet 31 in the vehicle width direction is small as described above, the curvature of the outer side surface of the side cowl 18 from the front of the air inlet 31 to the air inlet 31 can be reduced accordingly. Therefore, separation of the air inflow layer on the outer surface of the side cowl 18 is prevented.

[0007]

Embodiments of the present invention will be described below with reference to the drawings. (Embodiment 1) FIGS. 1 to 5 show a first embodiment.
In FIG. 1, reference numeral 1 is a motorcycle, and an arrow Fr indicates the front thereof. Body frame 2 of the motorcycle 1
Is composed of a head pipe 3 provided at the front end thereof, a pair of left and right main frames 4 extending rearward and downward from the head pipe 3, and a rear arm bracket 5 extending downward from the rear end of the main frame 4. ing.

A front fork 7 is rotatably supported on the head pipe 3, a front wheel 8 is supported on the lower end of the front fork 7, and a handle (not shown) is attached to the upper end of the front fork 7. . On the other hand, a rear arm 10 is pivotally supported on the rear arm bracket 5 by a pivot shaft 9 so as to be vertically swingable, and a rear wheel 11 is supported on a swing end of the rear arm 10.

An engine (not shown) is mounted on the vehicle body frame 2, and the rear wheel 11 receives power from the engine, whereby the motorcycle 1 can run. A fuel tank 13 is supported on the body frame 2. Further, 14 is a rider seat. A cowling 16 is provided to cover the front part of the vehicle body of the motorcycle 1. The cowling 16 is made of resin and is composed of a front cowl 17 that covers the vehicle body frame 2 from the front and side cowls 18 that extend rearward from the left and right ends of the front cowl 17. And each side of the engine is covered from the outside.

1 to 3, the main frame 4 is shown.
A carburetor 20 connected to the intake port of the engine is provided inside the vehicle in the vehicle width direction. The carburetor 20 is entirely covered with a casing 21, and an intake port 22 of the carburetor 20 is opened in the casing 21 toward the upper side.

A through hole 23 penetrating left and right is formed in the main frame 4, and a communicating hole 24 is formed in the casing 21 corresponding to the through hole 23. On the other hand, each of the left and right side cowls 18 is formed with a mounting opening 26 having a large area.
It is closed by a cover plate 30 forming a part of the. An opening 25 is formed in the cover plate 30, and a duct 28 that guides the traveling wind 27 from the opening 25 to the through hole 23 is provided.

In FIGS. 1 to 5, the opening 25 is 7
It is composed of one air inlet 31. The duct 28 covers the air inlet 31 from the inside in the vehicle width direction and is attached to the cover plate 30.
Short tube 3 extending from the rear side portion 2 toward the inside of the through hole 23
3 and 3.

2, FIG. 4, and FIG. 5, the air inlet 31 is opened forward and outward, and the air inlet 31 is a guide formed on the outer surface of the cover plate 30. It is formed at the rear end of the groove 35. This guide groove 3
Reference numeral 5 denotes a bottom plate 36 which is recessed in an arcuate ridge with a small curvature inward in the vehicle width direction from the outer surface of the cover plate 30 toward the rear.
And the cover plate 30 from the upper and lower edges of the bottom plate 36.
And an upper side plate 37 and a lower side plate 37, which extend to the outer side surface.

The traveling wind 27 flowing along the outer side surface of the side cowl 18 is guided by the guide groove 35, passes through the air inlet 31, and reaches the carburetor 20 through the duct 28. ing.

In the above case, the air inlets 31 are arranged vertically without a gap when viewed from the front, and are arranged so as not to overlap each other in the front-rear direction. For this reason, most of the traveling wind 27 flowing along the vicinity of the outer surface of the cover plate 30 is directed to the carburetor 20 side through the air introduction ports 31. This improves the charging efficiency of the engine, Performance is being improved.

The upper and lower side plates 37, 37 are formed so as to separate from each other as they move rearward, and a part of the traveling wind 27a of the traveling wind 27 passing through the guide groove 35 is generated by the side plates 37.
Flowing along. Therefore, the guide grooves 35, which are vertically adjacent to each other,
The traveling wind 27b flowing near the outer side surface of the cover plate 30 between 35 is guided by the partial traveling wind 27a, and other traveling winds 27b arranged in a staggered manner behind the both guide grooves 35, 35. It will enter into the guide groove 35. Therefore, also in this point, most of the traveling wind 27 is directed to the carburetor 20 side through the air introduction port 31.

The cross-sectional area of the guide groove 35 as viewed from the front becomes larger as it goes rearward.
Particularly, at high speed, the pressure of the traveling wind 27 flowing backward in the guide groove 35 toward the air introduction port 31 becomes a negative pressure. Therefore, a part of the traveling wind 27 flowing near the outer surface of the cover plate 30 is sucked into the guide groove 35 by the negative pressure,
It can be passed through the air inlet 31. Therefore, also in this point, most of the traveling wind 27 is directed to the carburetor 20 side through the air introduction port 31.

(Second Embodiment) FIG. 6 shows a second embodiment. According to this, the upper and lower plates 37, 37 of the guide groove 35
The space between them is enlarged at the front part, and becomes narrower toward the rear. Therefore, the traveling wind 27 that has entered the guide groove 35 is forcibly guided by the upper and lower plates 37, 37 and passed through the air introduction port 31, whereby many traveling winds 27 are vaporized. Turned to the 20 side.
In the above case, since each air inlet 31 has a small opening area, the cover plate 3 formed by forming the air inlet 31 is
A decrease in rigidity of 0 is prevented. Since other configurations and operations are the same as those in the first embodiment, common reference numerals are given to the drawings and the description thereof will be omitted.

[0019]

According to the present invention, an opening is formed in the side cowl, and a duct for guiding traveling wind introduced from the outside of the side cowl to the opening to a predetermined position inside the vehicle body is provided. In this case, since the opening is composed of a plurality of air introduction ports provided along the outer surface of the side cowl, even if the opening area of each air introduction port is reduced, it is sufficient in a front view as a whole. It is possible to secure an opening area of the size. And in this case, since the size of each air inlet in the vehicle width direction can be made small, the traveling wind that vigorously flows rearward along the outer surface of the side cowl passes through the whole of each portion of each air inlet and is ducted. Will flow to the side. Therefore, sufficient traveling wind is introduced in view of the opening area of the opening. Further, as described above, since the size of each air introduction port in the vehicle width direction is small, the curvature of the outer side surface of the side cowl from the front of this air introduction port to this air introduction port can be reduced accordingly, and therefore, The separation of the air inflow layer on the outer surface of the side cowl is prevented. Therefore, the occurrence of turbulence is prevented, and the running resistance is reduced.

[Brief description of drawings]

FIG. 1 is an overall side view of a motorcycle according to a first embodiment.

FIG. 2 is a partially enlarged view of FIG. 1 in the first embodiment.

3 is a plan view of what is shown in FIG. 2 in Embodiment 1. FIG.

4 is a partially enlarged cross-sectional view of FIG. 3 in Embodiment 1. FIG.

5 is a sectional view taken along line 5-5 of FIG. 4 in Example 1. FIG.

FIG. 6 is a diagram corresponding to FIG. 2 in the second embodiment.

[Explanation of symbols]

 1 Motorcycle 16 Cowling 18 Side cowl 20 Vaporizer 25 Opening 27 Running wind 28 Duct 30 Cover plate 31 Air inlet

Claims (1)

[Claims] 1. A side cowl for covering the side surface of the vehicle body from the outside is provided, and an opening is formed in the side cowl, and the traveling wind introduced into the opening from the outside of the side cowl is guided to a predetermined position inside the vehicle body. In the air introduction structure for a motorcycle cowling provided with one duct, the air introduction structure for a motorcycle cowling, wherein the opening is constituted by a plurality of air introduction ports provided along an outer surface of the side cowl.