JP2002284074A - Intake duct device for motorcycle - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an intake duct device for a motorcycle capable of improving intake efficiency of air by effectively taking the air in an intake device, and improving an aesthetic appearance. SOLUTION: The intake duct device for a motorcycle 24 includes a radiator 20 for cooling an engine hung on a vehicle body frame 3. A front cowling 2 covers a front part of the vehicle body frame and the engine, and traveling air is guided to the intake device of the engine in traveling. A tip end of the intake duct device 24 projects to a front side of the vehicle from the front cowling 2, and is arranged in a front part of an air box 22a of the intake device 22. The front cowling 2 comprises a cowling body 35 having a wind screen 40 and a headlight 42, and another cowling member 36. The tip end of the intake duct device 24 is positioned beneath the cowling body 35 and the air box 22a is arranged in a position higher than the intake duct device 24 from a ground surface.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an air intake duct device for a motorcycle, and more particularly to an air intake duct device for a motorcycle which improves air intake efficiency and reduces the number of assembly steps and the number of parts. .

[0002]

2. Description of the Related Art There is a motorcycle in which a front body of a motorcycle is covered with a streamlined front cowling to reduce air resistance during traveling and improve appearance. further,
In such a vehicle type, an intake duct in which a pipe-like intake duct extends forward from an intake device such as an air cleaner or an air box, and a leading end of the intake duct is connected to a traveling wind inlet formed in the front of the front cowling or the like. Some are equipped with devices. According to such an intake duct device, the head wind blown from the front when the motorcycle is running is taken into the intake duct and sent to the intake device, thereby greatly improving the efficiency of charging the engine with intake air. The engine output can be increased.

[0003] In such an intake duct device, it is desirable that the tip of the intake duct protrude forward from the surface of the front cowling. By doing so, the airflow flowing on the front cowling surface is less likely to interfere with the airflow flowing into the intake duct during traveling, so air is more efficiently taken into the intake duct than when the tip of the intake duct is not protruded. As a result, the charging efficiency of the intake air can be improved.

[0004]

In the intake duct device of a motorcycle, since the intake duct is generally manufactured by molding a synthetic resin, a parting line of a molding die is formed in a longitudinal direction thereof. In particular, in the case of blow molding, partial thickness deviation tends to occur in addition to the parting line. If such an intake duct is provided so that its tip projects forward from the surface of the front cowling, a parting line or uneven thickness can be seen from the opening at the front end of the intake duct, resulting in an extremely aesthetic appearance. Worse.

For this reason, generally, a short duct extension member separate from the intake duct is manufactured with good appearance, this duct extension member is connected to the tip of the intake duct, and only the duct extension member is introduced into the cowling by the traveling wind. Deterioration of the aesthetic appearance is prevented by protruding forward from the mouth, but with this duct extension member, it is necessary to fix the cowling's running air inlet with a number of dedicated fastening members such as screws (screw). was there.

The present invention has been made in view of the above-described circumstances, and has been made to improve the aesthetic appearance and the commercial efficiency while improving the air intake effect by efficiently taking in air into the intake device. An object of the present invention is to provide an intake duct device for a motorcycle.

[0007]

SUMMARY OF THE INVENTION An intake duct device for a motorcycle according to the present invention has the following objects.
As described in claim 1, an engine is suspended on the body frame, a radiator for cooling the engine is provided, the front half of the body frame and the engine are covered with a front cowling, and the head wind blows from the front of the vehicle during traveling. An intake duct device for a motorcycle including an intake duct device that guides to an intake device of an engine and has a tip protruding forward in a vehicle traveling direction from a surface of the front cowling, wherein the front cowling includes a windscreen and a headlight. A cowling body and other cowling components are provided, and the intake duct device is disposed at the front of an air box as an intake device disposed below a fuel tank. It is located below the cowling body above the front wheel rotation center. It is obtained by disposing the air box at a height higher position from the ground surface from the distal end of the intake duct device.

According to another aspect of the present invention, there is provided an intake duct device for a motorcycle according to the present invention, wherein the intake duct device includes an intake duct that is allowed to pass above a radiator. It is a thing.

[0009]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a perspective view of a motorcycle according to an embodiment of the present invention;

FIG. 1 is a left side view of a motorcycle to which the intake duct device according to the present invention is applied, and FIG. 2 is a front view of the motorcycle shown in FIG. In the motorcycle 1, the front head of the vehicle body is covered with a streamlined front cowling 2 for high-speed traveling on the road, so that the air resistance during traveling and the appearance are improved.

The body frame 3 of the motorcycle 1 has a pair of left and right thick main pipes 5 extending obliquely downward and rearward from a head pipe 4 located at the front of the head and connected to a frame body 6. 7 extends rearward. A front fork 8 is rotatably supported on the head pipe 4 so as to be rotatable left and right. A front wheel 9 is supported at a lower end thereof, while a front fork 8 extends rearward on a pivot shaft 11 that is installed on the frame body 6 in the vehicle width direction. A swing arm 12 is pivotally supported to be able to swing up and down, and a rear wheel 13 is supported at a rear end thereof.

An engine (not shown) is suspended from the main pipe 5 of the body frame 3 to the frame body 6, and the power of the engine is transmitted to the rear wheels 13 by a chain 14. Further, a fuel tank 15 is mounted on the upper part of the main pipe 5, and a rider seat 16 for a driver and a pillion seat 17 for riding the same are installed on the front and rear on the rear frame 7. The lower periphery and the rear frame of the rider seat 16 and the pillion seat 17 are covered with a rear cowling 18 made of synthetic resin. The member indicated by reference numeral 19 is an exhaust muffler, and the member indicated by reference numeral 20 is a radiator for cooling the engine.

A not-shown recess is formed in the center of the fuel tank 15 in the width direction of the vehicle so as to indent from the bottom to the top. Is provided. From the lower surface of the air box 22a, intake pipes 23 for the number of cylinders of the engine extend downward and are connected to a mixture supply device (not shown) such as a carburetor or a fuel injection device provided in the engine. In addition, the air box 22a
A pair of left and right intake duct devices 2 according to the present invention
4 is connected.

FIG. 3 is an exploded perspective view showing a first embodiment of the intake duct device 24, and FIG. 4 is a cross-sectional view of the intake duct device 24 taken along the line IV-IV of FIG. As shown in FIGS. 1 and 3, the intake duct device 24 includes a tubular intake duct 25 molded of a synthetic resin. A duct joint 26 formed of a flexible material such as rubber is connected to the rear end of the intake duct 25. The rear end of the duct joint 26 and the air box 22 a are connected to the main pipe 5 of the body frame 3. Are connected so as to sandwich a duct hole (not shown) formed at the bottom.

On the other hand, a separate duct extension member 27 as shown in FIGS. 4 and 6 is connected to the end of the intake duct 25 via an intake net 28. For example, the intake net 28 is tightly fitted to a step 31 formed on the outer periphery of the distal end of the intake duct 25, and the duct extension member 27 is densely fitted on the step 32 formed on the outer periphery of the distal end of the intake net 28. Mated. The intake net 28 is omitted and the intake duct 2
The duct extension member 27 may be directly fitted to the step portion 31 of No. 5.

A pair of left and right traveling wind inlets 33 formed in the front cowling 2 are connected to the duct extension member 27.
And is fixed so as to protrude forward from the surface of the front cowling 2 and is opened forward. Although this duct extension member 27 is a synthetic resin molded product, it needs to be manufactured with good appearance so that the parting line of the molding die does not appear in the appearance of the motorcycle 1.

For example, the first half 2 of the duct extension member 27
7f (see FIG. 6) projects forward from the traveling wind inlet 33 and is exposed to the outside, but the latter half 27r is concealed inside the traveling wind inlet 33 and cannot be seen from the outside. The mold structure of the duct extension member 27 may be considered so that the parting line is formed in the portion 27r in the circumferential direction.

By providing such an intake duct device 24, a head wind blown from the front when the motorcycle 1 travels passes through the duct extension member 27, the intake net 28, the intake duct 25, and the duct joint 26 to the air box 22a. As a result, the charging efficiency of the intake air into the engine is greatly improved by the supercharging effect, and the engine output is increased. Moreover, since the duct extension member 27 projects forward from the surface of the front cowling 2, the airflow flowing on the surface of the front cowling 2 hardly interferes with the airflow flowing into the duct extension member 27 during traveling. Air can be efficiently taken into the intake duct 25.

Since only the portion of the duct extension member 27, which is manufactured with good appearance, protrudes forward from the traveling wind introduction port 33, the traveling wind does not extend along the tip of the intake duct 25 itself without the duct extension member 27. Compared to the case where the projection is protruded from the introduction port 33, the parting line of the molding die formed in the longitudinal direction of the intake duct 25 and the partial thickness deviation are less visible from the outside, and the aesthetic appearance is greatly improved.

The front cowling 2 is shaped to cover from the upper part of the front fork 8 to the first half of the body frame 3 and the engine, and is assembled from a plurality of cowling components formed of synthetic resin. . For example, as shown in FIG. 1, a pair of left and right cowling sides 36 are connected to lower portions on both sides of a cowling body 35 located at the forehead of the front cowling 2, and a cowling under 37 is connected to lower ends of these right and left cowling sides 36. As shown in FIG. 3, a small side inner panel 38 is fixed inside the cowling sides 36 on both the left and right sides. The side inner panel 38 functions as a wind guide plate for guiding the head wind blown from the front to the radiator 20 when the motorcycle 1 travels.

These cowling components 35, 36,
37, 38 are fixed to each other by a fastening member such as a screw (screw) and integrated. In addition, a transparent wind screen 40 is fixed to the cowling body 35 with a screw or the like, and a headlight 42, a direction indicator 4
3. Parts such as the rear view mirror 44 are attached.

The above-described traveling wind inlet 33 is provided at a joint between the cowling side 36 and the side inner panel 38. That is, as shown in FIG. 3, a front edge of the cowling side 36 is formed with a substantially U-shaped indented portion 46 in a front view, and a front edge 38a of a flat side inner panel 38 is formed at this portion. Are adjusted to form the traveling wind introduction port 33. The traveling wind inlet 33 may be provided at another cowling component, for example, at a joint between the cowling body 35 and the cowling side 36.

The side inner panel 38 is integrally formed with three cylindrical fastening portions 47, 48, and 49, and these fastening portions 47, 48, and 49 are fixed to the cowling side 3.
6, three fastening bosses 50, 51, 52 integrally formed
Are fastened by screws 53 respectively. At this time, the fastening piece 5 integrally formed on the upper and lower contours of the intake duct 25
4, 55 (also shown in FIG. 1) are side inner panels 3
8 and the fastening bosses 50 and 51 of the cowling side 36 are fastened together.

On the other hand, a pair of upper and lower portions are formed on the inner peripheral surface of the portion where the traveling wind inlet 33 is formed, that is, on the inner peripheral surface of the bay portion 46 of the cowling side 36 and near the front edge 38a of the side inner panel 38. The fitting projections 57 and 58 are integrally formed so as to face each other. These fitting projections 57 and 58 are formed, for example, in a short cylindrical shape.

On the other hand, the rear half portion 27 of the duct extension member 27
On the outer peripheral surface of r, fitting recesses 59, 60 into which the fitting protrusions 57, 58 can be fitted are formed. That is, the fitting recesses 59 and 60 are formed two by two on the vertical wall surfaces on both sides of the rear half portion 27r of the duct extension member 27 so as to match the positions of the fitting projections 57 and 58. The fitting recesses 59 and 60 may be formed in a simple through-hole shape.

Then, the fitting projections 57, 58 of the cowling side 36 and the side inner panel 38 are fitted into the fitting recesses 59, 60 of the duct extension member 27, so that the cowling side 36 and the side inner panel 38 are fitted.
, The duct extension member 27 is fixed to the traveling wind introduction port 33.

As a whole assembling procedure, first, the intake net 28 and the duct extension member 27 are fitted into the intake duct 25,
Next, the intake duct 25, the cowling side 36 and the side inner panel 38 are overlapped while fitting the fitting concave portions 59 and 60 of the duct extension member 27 into the fitting convex portions 57 and 58 of the cowling side 36 and the side inner panel 38. And three members 25 (fastening pieces 54,
55), 36 and 38 are tightened together.

According to the intake duct device 24, the cowling side 36, which is a component of the front cowling 2,
At the same time when the side inner panel 38 is assembled, the duct extension member 27 is connected to the traveling wind inlet 33 of the front cowling 2.
Can be fixed. Since there is no need to use a dedicated screw or the like for fixing the duct extension member 27 at all, the duct extension member 27 can be securely fixed to the traveling wind inlet 33 with an extremely small number of parts and a small number of assembly steps.

FIG. 5 shows a second embodiment of the intake duct device for a motorcycle according to the present invention.

In the intake duct device 64, the duct extension member 67 connected to the distal end of the intake duct 65 via the intake net 66 has a front half 67f and a rear half 67r, as shown in FIG. , Are formed longer than in the case of the duct extension member 27 of the first embodiment. Further, the length of the step 68 at the tip of the intake net 66 and the length from the fitting projections 71, 72 of the cowling side 69 and the side inner panel 70 to the traveling wind inlet 73 are also longer than in the first embodiment. Is set.

For this reason, the step 6 at the tip of the intake net 66
8, the duct extension member 67 is fitted to the intake duct 65.
, The air intake net 66 and the position of the traveling wind inlet 73 can be slid in the front-rear direction by about several centimeters.

On the other hand, the rear half 67 of the duct extension member 67
A plurality of, for example, three sets of a pair of upper and lower fitting recesses are formed on the outer peripheral surface of the r along the sliding direction of the duct extension member 67. And these three sets of fitting recesses 74a, 74
b and 74c are selected, and the fitting projection 71 between the cowling side 69 and the side inner panel 70 is selected.
72.

According to the intake duct device 64, the amount of protrusion of the duct extension member 67 from the surface of the front cowling (running air inlet 73) can be changed in three stages. The protrusion amount of the duct extension member 67 is
2 becomes the shortest when the fitting recess 74a is fitted, and becomes the longest when the fitting recess 74c is fitted. Therefore,
The protrusion amount of the duct extension member 67 can be set according to the traveling conditions of the motorcycle 1.

FIGS. 8 to 10 show a third embodiment of the intake duct device for a motorcycle according to the present invention.

The slide length of the duct extension member 79 in this intake duct device is set longer than in the second embodiment. Also, the duct extension member 79 has an outer peripheral surface on the rear half portion 79r.
A larger number (for example, eight sets) of circular fitting recesses 80 are continuously formed so as to overlap each other along the sliding direction 9.

On the other hand, the shape of the fitting projection 82 formed on the cowling side (not shown) and the side inner panel 81 (see FIG. 9) is formed into a short cylindrical shape having a slit 83. The forming direction of the slit 83 is along the sliding direction of the duct extension member 79 (the arrangement direction of the fitting concave portions 80). The fitting projection 82 is fitted into one of the large number of fitting recesses 80.

As described above, since a large number of fitting concave portions 80 are continuously formed, the amount of protrusion of the duct extension member 79 from the traveling wind introduction port can be changed more finely. Moreover, when changing the amount of protrusion of the duct extension member 79, if the user manually grasps the duct extension member 79 and pulls out or pushes it into the traveling wind introduction port, the slit 83 is formed as shown in FIG. Since the fitting protrusion 82 is bent and moves between the fitting recesses 80, the protrusion amount of the duct extension member 79 can be quickly changed without disassembling the cowling side and the side inner panel 81.

As a modification of the third embodiment,
Although not shown, for example, the fitting concave portion is formed in a linear groove shape along the sliding direction of the duct extension member, and the fitting margin between the duct extension member and the traveling wind introduction port is set to be tight, and the frictional force is set. Thus, the duct extension member may be held inside the traveling wind introduction port so that the amount of protrusion of the duct extension member can be changed steplessly.

In the first to third embodiments, each of the fitting projections 57, 58, 71, 72, 82 is formed as a fitting recess, and each of the fitting recesses 59, 60, 74a, 74 is formed.
b, 74c and 80 may be formed as fitting projections.

As described above, in the intake duct device for the motorcycle, the duct extension member is provided so as to be slidable in the front-rear direction of the motorcycle with respect to the positions of the intake duct and the traveling wind introduction port, and the fitting recess is provided. Are provided along the sliding direction of the duct extension member, so that the amount of protrusion of the duct extension member from the traveling wind introduction port can be changed and set according to the traveling conditions of the motorcycle.

[0041]

As described above, in the intake duct device for a motorcycle according to the present invention, the intake duct device is projected forward from the front cowling surface to improve the efficiency of intake of air into the intake device. The air can be efficiently and efficiently taken in from the front of the front cowling, and the merchantability can be improved without impairing the aesthetic appearance of the intake duct device and thus the motorcycle.

[Brief description of the drawings]

FIG. 1 is a left side view of a motorcycle to which an intake duct device according to the present invention is applied.

FIG. 2 is a front view of the motorcycle shown in FIG.

FIG. 3 is an exploded perspective view of the intake duct device showing the first embodiment of the present invention.

FIG. 4 is a cross-sectional view of the intake duct device taken along the line IV-IV of FIG. 1;

FIG. 5 is a cross-sectional view of an intake duct device showing a second embodiment of the present invention.

FIG. 6 is a perspective view of a duct extension member according to the first embodiment of the present invention.

FIG. 7 is a perspective view of a duct extension member according to a second embodiment of the present invention.

FIG. 8 is a perspective view of a duct extension member according to a third embodiment of the present invention.

FIG. 9 is an enlarged view of a fitting protrusion of a side inner panel according to a third embodiment of the present invention.

FIG. 10 is a side view showing a fitting state of a fitting projection and a fitting recess in the third embodiment of the present invention.

[Explanation of symbols]

 Reference Signs List 1 motorcycle 2 front cowling 3 body frame 4 head pipe 5 main pipe (main frame) 6 frame body 8 front fork 9 front wheel 12 swing arm 13 rear wheel 15 fuel tank 20 radiator 22 intake device 22a air box 24 intake duct device 25 intake Duct 26 Duct joint 27 Duct extension member 28 Intake net 33 Running air inlet 35 Cowling body (Cowling component) 36 Cowling side (Cowling component) 38 Side inner panel (Cowling component) 40 Wind screen 42 Headlight

Claims (2)

[Claims] An engine is suspended from a body frame, a radiator for cooling the engine is provided, a front cowling of the body frame and an engine are covered by a front cowling, and a head wind blows from the front of the vehicle during traveling. And a front cowling, a cowling body including a windscreen and a headlight, and the like. The above-mentioned intake duct device is arranged at the front of an air box as an intake device disposed below the fuel tank, and the tip of the intake duct device is located at the center of the front wheel rotation center. Located below the upper cowling body, Intake duct device for a motorcycle, wherein a height from the ground surface from the distal end of the winding device is disposed the air box to a high position. 2. The intake duct device for a motorcycle according to claim 1, wherein the intake duct device includes an intake duct that is passed above a radiator.