JP3115698B2 - Motorcycle wind guide device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a wind guide device for a motorcycle for supplying a traveling wind to an engine, and more particularly, to a large amount of traveling wind supplied to an engine when a front portion of a vehicle body is surrounded by a cowling. Regarding what was done.

[0002]

2. Description of the Related Art In a motorcycle in which a front portion of a vehicle body is surrounded by a cowling and a radiator is disposed in front of an engine, when a running wind passing through the radiator is supplied to an engine, the temperature of the air is relatively high. There is a problem of decline. Conventionally, therefore, it has been common practice to arrange a duct or pipe for guiding air in the cowling, to take in low-temperature running wind ahead of the radiator by this duct or the like, and to supply it to the engine. However, in this method, separate parts such as a duct and a pipe are required, and the number of assembling steps increases accordingly. Therefore, as such a wind guide device that does not use a separate component, as described in, for example, Japanese Utility Model Laid-Open No. 2-123485, a wind guide duct is integrally formed on a cowling, or a Japanese Utility Model Application Laid-Open No. 62-43993. As described in Japanese Patent Application Laid-Open Publication No. H10-209, there is an example in which a cylindrical main frame constituting a body frame is used as a wind guide pipe.

[0003]

However, in the case of the above-mentioned conventional apparatus, a duct is formed integrally with the cowling, or an existing main frame is used as a wind guide pipe, so that a sufficient passage area is ensured. Therefore, there is a problem that it is difficult to secure a sufficient amount of traveling wind.

[0004] The present invention has been made in view of the above-mentioned conventional circumstances, and has as its object to provide a wind guide device for a motorcycle that can introduce a large amount of traveling wind.

[0005]

According to a first aspect of the present invention, a motorcycle having a body frame having a pair of left and right main frames extending rearward from a head pipe runs on an engine mounted below the main frame. In a wind guide device for supplying wind, a front portion of the vehicle body frame, the engine and a front fork are surrounded by a cowling, and a wind guide port is formed at a center portion in a vehicle width direction on a front surface of the cowling, so that traveling wind flows through the cowling. Arranging a wind guide portion leading to the engine side, the wind guide portion, a front end portion connected to the wind guide port,
Following the front end, the vehicle has a middle part extending in the vehicle width direction and rearward and passing under both sides of the left and right front forks below the steering handle. It is characterized in that the middle part has a vertical cross section. According to a second aspect of the present invention, in the first aspect, the surrounding portion is formed integrally with a front portion of the main frame, and continuously surrounds a periphery of a head pipe and left and right sides of a front fork; An extension extending from the portion to the front of the vehicle, and forming an insertion hole through which the pair of left and right fork bodies of the front fork is inserted into the surrounding portion without interfering with the steering operation. The extension portion corresponds to the front end portion, the outside portion of the insertion hole of the surrounding portion corresponds to the middle portion, and the rear portion of the surrounding portion opens toward the engine at the rear portion of the head pipe. It is characterized by having an air outlet to blow out. According to a third aspect of the present invention, in the second aspect, the blower port is connected to an intake passage opening of an engine disposed behind the radiator by a wind guide duct.

[0006]

According to the wind guide device of the present invention, low-temperature traveling wind is introduced into the wind guide portion from the wind guide port and supplied to the engine. According to the second aspect of the present invention, the traveling wind is blown out from the air outlet to the vicinity of the engine, and the low-temperature traveling wind is introduced into the engine. According to the third aspect of the present invention, since the air outlet and the intake passage opening of the engine are connected by the air guide duct, the air from the air outlet does not mix with the air passing through the radiator. Air is more reliably supplied to the engine. In the present invention, the front end portion of the air guide portion has a horizontally long cross-sectional shape, and the middle portion has a vertically long cross-sectional shape. The area can be secured. That is, since the front end of the wind guide section has a horizontally long cross section, the cowling surrounding the wind guide section can be formed in a wedge shape when viewed from the side, and the midway section has a vertically long cross section, so that the cowling car The dimension in the width direction can be reduced, so that the aerodynamic characteristics are not degraded while securing the cross-sectional area of the air guide portion. According to the second aspect of the present invention, the wind guide portion is formed so as to continuously surround the periphery of the head pipe and the left and right sides of the front fork from the front portions of the pair of left and right main frames and extend forward, so that the passage area is reduced. Therefore, it is possible to sufficiently secure the traveling wind. Further, since the wind guide section is formed to surround the front fork from the head pipe as described above, the rigidity of the body frame near the head pipe is greatly improved.

[0007]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 to 5 are views for explaining a wind guide device according to an embodiment of the present invention. FIG. 1 is a plan view, and FIGS.
1 is a sectional view taken along line II-II and III-III in FIG. 1, FIG. 4 is a front view showing the vicinity of an intake port of the engine, and FIG. 5 is a left side view of a motorcycle provided with the apparatus of this embodiment.

In the drawing, reference numeral 1 denotes a motorcycle provided with the apparatus of the embodiment, 2 denotes a body frame of the motorcycle 1,
This is a structure in which the rear ends of a pair of left and right main frames 43, 43 extending rearward from the head pipe 3 are connected by a rear arm bracket 6. A steering shaft of the front fork 4 is supported by the head pipe 3 so as to be steerable left and right, and a front wheel 5 is supported at a lower end of the front fork 4. A pivot portion of a rear arm 7 formed by connecting the pair of right and left arm bodies 50 to each other by the rear arm bracket 6 is pivotally supported up and down so that the rear wheel 8 is pivotally supported at the rear end of the arm 7. ing. An engine unit 9 is suspended and supported below the vehicle body frame 2, a fuel tank 10 is mounted above, and a seat 11 is disposed behind the fuel tank 10.
1 is surrounded by a side cover 12. Furthermore, the body frame 2, the engine unit 9 and the front fork 4 are surrounded by a cowling 13.

The engine unit 9 is a two-stroke water-cooled V-type four-cylinder engine. An upper cylinder body 15 and a lower cylinder body 16 are provided on the upper and lower front walls of a crankcase 14 at predetermined bank angles. And a cylinder head 17 is attached to each cylinder body.

Upper and lower exhaust pipes 18 and 19 are connected to the rear sides of the cylinder bodies 15 and 16, respectively, one pair of left and right exhaust pipes. The left and right upper exhaust pipes 18, 18 extend from the space between the main frames 43, 43 to the side cover 12.
The left and right lower exhaust pipes 19 and 19 extend obliquely upward on the left and right sides of the rear arm 7 under the crankcase 14.

A rear wheel driving sprocket 40 is fixed to the front end of the output shaft 37 protruding from the rear end left wall of the crankcase 14. The sprocket 40 is a driven sprocket 41 fixed to the rear wheel 8. Drive chain 42
Are connected by

Reed valves are inserted and arranged in upper and lower intake ports formed in the upper and lower cylinder bodies 15 and 16 of the crankcase 14, respectively. Throttle bodies 66, 67 are connected via 67a. This lower side,
Inside the upper throttle bodies 67 and 66, throttle valves 69a and 69b are rotatably disposed.
The fuel injection valve 68 is provided on the lower wall surface and the upper wall surface, respectively.
a, 68b are mounted.

The lower throttle valve 69
a, 69a, and the upper throttle valve 69b,
69b are connected by minimum opening adjustment mechanisms 70,70. The minimum opening adjustment mechanism 70 has a structure in which arms 70a and 70b fixed to the left and right throttle valves are connected by an adjustment spring 70c and an adjustment bolt 70d. The lower adjustment mechanism 70 and the upper adjustment mechanism 70 are connected by an adjustment rod 80. The minimum opening of each throttle valve and, consequently, the idling speed are adjusted by the adjusting bolt 70d and the adjusting rod 80. Also throttle cable 72
Is transmitted from the lower left throttle valve 69a to the lower right throttle valve 69b,
It is transmitted to the upper left and right throttle valves 69b, 69b.

Reference numeral 71 denotes the throttle valve 69a.
Throttle opening sensors 73 and 74 for adjusting the fuel pressure supplied to the lower and upper fuel injection valves 68a and 68b, respectively, and 75 a fuel for supplying fuel to each of the above fuel injection valves. It is a pump.

At the front of the body frame 2, a box-shaped air guiding portion 44 for introducing a traveling wind into the throttle bodies 66 and 67 is integrally formed. This air guide 44
A joining portion 43a formed by joining the front portions of the left and right main frames 43, 43 to each other;
And left and right fork bodies 4a, 4 of the front fork 4.
It is composed of a surrounding portion 44a surrounding the periphery of a, and an extending portion 44c extending further forward from here.

The joint 43a has a structure in which the bottom surfaces of the left and right main frames 43, 43 are connected to each other by a bottom wall 43b and their inner surfaces are connected to each other by an inclined wall 43e. It communicates with the portion 44a. The left and right sides 43d of the bottom wall 43b are recessed upward, and a ventilation port 43c is formed at the rear end of the bottom wall 43b at the center in the vehicle width direction.

A pair of left and right oval insertion holes 44b are vertically formed through the surrounding portion 44a, and the fork body 4a is inserted into the insertion holes 44b. A portion of the surrounding portion 44a outside the fork main body 4a is a middle portion having a vertically long horizontal cross section. The insertion hole 44b
Is set to a size that does not hinder the rotation of the front fork 4. The extended portion (front end) 44c extending forward from the surrounding portion 44a has a horizontally long cross-sectional shape, and is narrowed toward the center of the vehicle width toward the front, and an outside air inlet ( An air introduction port 44d is formed. The outside air inlet 44d faces outward from an opening 13a formed at the front end of the cowling 13.

The upper edges of the left and right body portions 64a of the radiator 64 are located at the left and right side portions 43d recessed above the bottom wall 43b of the joint portion 43a. Are connected by a connecting hose 64a which crosses right and left below the bottom wall 43b.

The air inlet 43c formed in the bottom wall 43b of the air guide 44 has an inlet 6c for the air guide duct 65.
5a is connected. The air guide duct 65 has a connection portion 6 which is a substantially rectangular box in a front view below the introduction portion 65a.
5b are integrally formed, and the connecting portion 65b is located on the central rear surface of the radiator 65. The throttle bodies 66 and 67 are inserted into the connection portion 65b from the rear wall thereof, and open to the connection portion 65b.

Next, the operation and effect of this embodiment will be described. In the present embodiment, the traveling wind introduced into the extension portion 44c from the wind guide port 44d of the wind guide portion 44 passes between the insertion hole 44b of the surrounding portion 44a and the head pipe 3 and communicates with the communication port 4d.
The air flows into the joint 43a from 3f, and is introduced into the throttle valves 66 and 67 from the air outlet 43c of the joint 43a through the air guide duct 65. Therefore, air having a lower temperature than the air heated through the radiator 64 is supplied to the engine, and the charging efficiency of the engine can be increased. Further, the connection by the air guide duct 65 can surely prevent the relatively high temperature air that has passed through the radiator 64 from being mixed in, and this also contributes to the improvement of the charging efficiency.

In this embodiment, since the front end of the air guide section has a horizontally long cross section, the cowling surrounding the air guide section can be formed in a wedge shape when viewed from the side, and the middle section has a vertically long cross section. As a result, the size of the cowling in the vehicle width direction can be reduced, so that the aerodynamic characteristics do not decrease while securing the cross-sectional area of the air guiding portion. Further, the air guide portion 44 of the present embodiment has a shape that continuously surrounds the side of the front fork 4, the periphery of the head pipe 3, and the front portions of the main frames 43, 43, so Since a sufficient passage area can be secured, a large amount of traveling wind can be introduced,
The required amount of air can be easily and reliably secured. Further, since the air guide portion 44 of the present embodiment is set in the above-described shape, it functions as a reinforcing member for improving rigidity near the head pipe 3 of the body frame 2.

In the above-described embodiment, the air outlet 43c and the throttle bodies 66 and 67 are connected by the air guide duct 65. However, even when this duct is not provided, the low-temperature traveling wind blown out from the air outlet 43c. As a result, the air temperature near the throttle body can be reduced to some extent, and an effect of improving the charging efficiency can be expected.

FIGS. 6 to 9 are views for explaining a modified example in which the structure of the front end portion of the air guide portion, the structure of the air guide passage around the head pipe, and the structure around the radiator are improved in the above embodiment. In the drawings, the same reference numerals as those in FIGS. 1 to 5 indicate the same or corresponding parts.

In this modification, a lower handle for connecting and fixing the left and right fork bodies 4a of the front fork 4 and a steering handle 4d are fixed to the upper bracket 4b, 4c near the upper bracket. The steering handle 4 d is located within the height range of the head pipe 3 in a side view, and is located above the surrounding portion 44 a of the wind guide portion 44.

The extension portion 44c of the air guide portion 44 is formed separately from the surrounding portion 44a, and is detachably attached to the front end surface of the surrounding portion 44a by bolting. The outside air inlet 44d of the extension 44c is fitted and inserted into the opening 13a of the cowling 13. A meter unit 83 such as a speedometer and an engine tachometer is mounted on the upper surface of the extension 44c via a bracket 83a. In this way, the extension portion 44c also functions as a front portion of the cowling 13 and a support stay for the meter unit 83.

A shimmy damper 82 for suppressing the slight vibration of the steering handle 4d is provided below the surrounding portion 44a in the vehicle width direction. The cylinder base end 82a of the shimmy damper 82 is fixed to the boss 4f of the lower bracket 4b by bolting, and the piston rod tip 82b is formed on the boss 4 formed on the surrounding portion 44a.
It is bolted and fixed to 3 g.

In this modified example, the air guide recess 3a is formed in the side wall of the head pipe 3 between the bearings 4g and 4g, and the recess 3a and the side wall 43h of the main frame 43 connected to the recess 3a. Is a part of the air guide passage (see FIG. 9).

The left and right radiators 64 disposed below the main frame 43 are provided with air outlets at the upstream openings 8 of the exhaust duct 81 so as to surround the rear surface of the radiators 64.
1b is connected. The downstream opening 81a of the exhaust duct 81 is connected to an exhaust port 13b formed on the cowling 13 on the side of the engine. As a result, the air that has passed through the radiator 64 is immediately discharged to the outside of the cowling 13.

In this modification, the bearing 4 of the head pipe 3
Since the conventional dead space between g and 4g is recessed in the vehicle width direction to form the air guide recess 3a, the area of the air guide passage can be increased accordingly, and the amount of air flow can be increased.

In the above modification, the extension 44c of the air guide 44 is used as a cowling stay. However, the support structure of the cowling 13 is not limited to this. For example, the support stay is provided near the head pipe of the body frame. Attach, extend the support stay forward in the air guide section,
The cowling can also be supported at the extension end. In the above-described embodiment and the modified example, the air outlet is formed on the bottom surface of the air guide portion. However, the air outlet is not necessarily formed on the bottom surface, and may be formed on another portion such as an inner surface.

[0030]

As described above, according to the wind guide device for a motorcycle according to the present invention, since the wind guide portion having the front end portion having the horizontal cross section and the middle portion having the vertical cross section is provided, the cowling is provided. The front end of the vehicle can be formed in a wedge shape in a side view and the size in the vehicle width direction can be reduced, so that a large amount of traveling wind can be supplied to the engine without deteriorating aerodynamic characteristics. According to the second aspect of the present invention, the wind guide portion is formed integrally with the vehicle body frame, and the wind guide portion is continuously formed at the front of the left and right main frames, around the head pipe, and at the left and right sides of the front fork. To extend forward, so that the passage area can be sufficiently secured,
A large amount of low-temperature running wind can be introduced around the engine, which has the effect of improving the charging efficiency of the engine, and has the effect of greatly improving the rigidity near the head pipe of the vehicle body frame due to the wind guide portion. Furthermore, according to the third aspect of the invention, there is an effect that the low-temperature traveling wind is prevented from being mixed with the air that has passed through the radiator, so that the engine can be more reliably supplied to the engine.

[Brief description of the drawings]

FIG. 1 is a plan view showing a wind guide device for a motorcycle according to an embodiment of the present invention.

FIG. 2 is a sectional view taken along line II-II of FIG.

FIG. 3 is a sectional view taken along line III-III of FIG. 1;

FIG. 4 is a front view around the throttle body of the embodiment.

FIG. 5 is a left side view of a motorcycle provided with the embodiment device.

FIG. 6 is a plan view showing a modification of the embodiment.

FIG. 7 is a side view of the modification.

FIG. 8 is a plan view of a radiator portion of the modification.

9 is a sectional view taken along line IX-IX in FIG. 7;

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Motorcycle 2 Body frame 3 Head pipe 4 Front fork 4a Fork main body 9 Engine unit 43 Main frame 43c Blow port 44 Baffle part 44b Insertion hole 44d Baffle port 64 Radiator 65 Baffle duct 66, 67 Throttle body (intake passage opening part) )

Continuation of the front page (56) References JP-A-63-61692 (JP, A) JP-A-57-7774 (JP, A) JP-A 2-123485 (JP, U) JP-A 62-43993 (JP) , U) Japanese Utility Model Showa 60-55529 (JP, U) Japanese Utility Model Showa 60-66594 (JP, U) (58) Fields investigated (Int. Cl. ⁷ , DB name) B62J 39/00 B62K 11/00

Claims (3)

(57) [Claims] An engine mounted below a main frame of a motorcycle having a body frame having a pair of left and right main frames extending rearward from a head pipe.
In baffle device for supplying the running wind down, the front portion of the body frame, the engine and the front fork Cow
Around the center of the cowling in the vehicle width direction.
The airflow opening is formed, and the traveling wind is blown into the cowling by the engine.
A wind guide section for guiding the air guide section to the air guide port.
The front end which is continued and the vehicle width direction and the rear following the front end
To the left and right front forks below the steering wheel.
A middle part passing on both outer sides, and the front end
And the cross section is
A wind guide device for a motorcycle, which has a vertically long shape . 2. The apparatus according to claim 1, wherein the air guide section is provided with
Formed integrally with the front of the main frame, around the head pipe
Enclosure and enclosure that continuously surrounds the left and right sides of the front fork
And an extension extending from the surrounding portion to the front of the vehicle,
A pair of left and right forks of the front fork is
Insertion hole for inserting the main body without interfering with steering operation
And the extension part is attached to the front end part.
Correspondingly, the outside of the insertion hole of the surrounding part corresponds to the halfway part.
At the back of the head pipe of the surrounding part, the engine
Air that blows toward the engine
A wind guide device for a motorcycle, wherein a wind port is formed . 3. The air guide device for a motorcycle according to claim 2, wherein the air outlet and an intake passage opening of an engine disposed behind the radiator are connected by an air guide duct.