JPH09164984A - External air intake device for motorcycle - Google Patents

Abstract

PROBLEM TO BE SOLVED: To increase the capacity of an air cleaner by providing air ducts removably and airtightly connected to the insertion hole of an air cleaner through a communication hole connected to an intake port and communicating the inside and outside of the branch section of a main frame. SOLUTION: Rear ducts 27b, 28b are connected to the base box 21 of an air cleaner 17 removably in the axial direction. When the air cleaner 17 is removed from the rear ducts 27b, 28b, the rear ducts 27b, 28b are moved to a front cowling 14 side in the axial direction and drawn from the air cleaner 17, and the air cleaner 17 can be easily removed. The air cleaner 17 itself is not required to be moved along the axial direction in the narrow space inside the fork branch sections 2b, 2c of a main frame 2, the capacity of the air cleaner 17 can be increased, and the interval with the fork branch sections 2b, 2c of the main frame can be shrunk.

Description

Detailed Description of the Invention

[0001]

TECHNICAL FIELD The present invention incorporates a driving wind,
The present invention relates to an outside air intake device for a motorcycle that is pressurized by the wind pressure and introduced into an air cleaner.

[0002]

2. Description of the Related Art Conventionally, some race type motorcycles are equipped with an outside air intake device which takes in traveling wind from an intake port of a cowling, pressurizes it by the wind pressure and introduces it into an air cleaner. That is, in this outside air intake device, the outside air pressurized by the traveling wind pressure generated as the vehicle travels is taken in from the intake port of the cowling, and is forcibly introduced into the air cleaner from the wind pressure introduction passage. The introduced outside air is sucked into the carburetor after dust and water are removed by the cleaner element.

Since the pressure of the outside air sucked into the carburetor is higher than the atmospheric pressure due to the traveling wind pressure, the density of the air-fuel mixture supplied from the carburetor to the engine is increased, and the engine is compared with the case where the carburetor is allowed to naturally inhale. The output of can be greatly increased.

[0004]

However, in such a conventional outside air intake device, since the detachability of the air cleaner, the carburetor, and the cowling is hardly taken into consideration, the detachment and maintenance thereof are complicated. However, there is a problem that airtightness after reassembly is poor.

Therefore, an object of the present invention is that the air cleaner and the cowling are easily attached and detached, the maintenance of these and the carburetor is easy, and the airtightness and the assembling of the components are good. An object is to provide an outside air intake device for a motorcycle.

[0006]

In order to solve the above-mentioned problems, the invention according to claim 1 of the present application is a cowling which is disposed in front of a head pipe and has an intake port opened on the front surface, and the above-mentioned head. A rectangular tubular main frame extending bifurcated rearward from the pipe, an air cleaner disposed inside the bifurcated branch portion of the main frame, and a branch of the main frame connected to the intake port. And an air duct which is inserted into a communication hole that communicates the inside and the outside of the unit and is detachably and airtightly connected to the insertion hole of the air cleaner.

Therefore, according to the present invention, when the air cleaner is attached to and detached from the air duct, the air duct can be axially inserted and removed from the air cleaner, and the air cleaner itself can be installed in a narrow space inside the main frame bifurcated portion. Since it is not necessary to move along the axial direction of the duct, the capacity of the air cleaner can be increased and the gap between the main frame and the bifurcated portion can be reduced.

According to a second aspect of the present invention, in addition to the first aspect of the present invention, the air duct is formed by connecting a front duct and a rear duct, and the front duct is axially connected to the intake port of the cowling. It is connected airtightly so that it can be removed and inserted.

Therefore, according to the present invention, by moving the front duct in the axial direction, the front duct can be removed from the intake port of the cowling. As a result, the detachability of the air duct and the cowling and the ease of maintenance can be improved.

According to a third aspect of the present invention, in addition to the second aspect of the present invention, the connecting portion between the front duct and the cown intake port is sealed with a urethane foam sealing material, and the front duct and the rear duct are connected. A rubber cylinder is externally fitted and sealed at the connecting portion of.

Therefore, according to the present invention, the vibration of the duct due to the vibration of the vehicle body during traveling can be absorbed by the flexible urethane foam material and the rubber sleeve, and the airtightness of the connecting portion of the air duct can be improved. In addition to being improved, the front duct and the rear duct can be easily attached and detached.

The invention according to claim 4 is the invention according to any one of claims 1 to 3, further, in the air cleaner, an insertion hole into which a communicating portion of the air duct is inserted, and the insertion hole. An air seal which is attached to the inner peripheral edge of the air duct and has a thin inner peripheral portion that is elastically deformable and airtightly adheres to the outer periphery of the insertion portion of the air duct to form a seal, which is thinner than the outer peripheral portion. With.

Therefore, according to the present invention, the outer periphery of the insertion portion of the air duct inserted into the insertion hole of the air cleaner is entirely surrounded by the thin inner peripheral portion of the air seal fitted in the insertion hole of the air cleaner. Since it seals airtightly over the entire area, the airtightness of the connection between the air cleaner and the air duct can be improved, and the outer circumference of the air duct insertion part is elastically deformed by the thin inner circumference of the air seal. Therefore, even if there is some deviation between the communication hole of the frame for inserting the air duct and the insertion hole of the air cleaner, the deviation can be absorbed by the elastic deformation of the thin inner peripheral part of the air seal. Therefore, the air duct can be easily attached to the air cleaner, and the airtightness of the air cleaner can be improved.

[0014]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiments of the present invention will be described below with reference to FIGS. 1 to 4
The same or corresponding parts are designated by the same reference numerals.

FIG. 2 is a right side view of a motorcycle which is an example of a vehicle to which the present invention is applied. This motorcycle 1
Inserts a front fork 3 into a head pipe 2a of a main frame 2 so as to be rotatable left and right. A front wheel 4 is rotatably attached to a lower end portion of the front fork 3, and a handlebar 5 is fixed to an upper end portion. doing.

On the other hand, a pivot shaft 6 is erected in the vehicle width direction at the center of the lower portion of the main frame 2, and a swing arm 7 is rotatably connected to the pivot shaft 6 and the rear end of the swing arm 7 is connected. A rear wheel 8 is rotatably attached to the section.

An engine 10 is mounted on the front half of the main frame 2, a fuel tank 11 is installed above the engine 10, and seating seats 12 and 13 are installed behind the fuel tank 11. . The front half and rear portion of the vehicle body are covered with a streamlined front cowling 14 and a rear cowling 15, respectively, to make the outer shape of the motorcycle 1 aesthetically pleasing and reduce air resistance during traveling. .

A carburetor 16 is arranged above the engine 10 as shown in FIG. The carburetor 16 supplies fuel to the engine 10 and is connected to the air cleaner 17. As shown in FIG. 2, the air cleaner 17 is arranged so as to enter a recess (not shown) on the lower surface of the fuel tank 11.

The air cleaner 17 is, for example, an upper and lower 18a,
A cylindrical cleaner element 19 is built in a resin-made cleaner box 18 that can be divided into 18b, and the space inside the cleaner element 19 is used as a dirty side A into which air before purification flows. The clean side B into which air after cleaning the space around the cleaner element 10 by the cleaner element flows in
It is composed. The cleaner element 19 can be externally removed together with the opening / closing lid 20 on the upper surface of the cleaner box 18, and can be cleaned or replaced.

The cleaner box 18 has an inlet pipe 22 penetrating the bottom surface thereof fixed to the bottom surface on the front side in an airtight manner, and the inlet tube 22 connects the internal space of the base box 21 to the dirty side A.

On the other hand, an outlet pipe 23 is provided through the bottom surface of the rear side of the cleaner box 18, and the intake port 16 of the carburetor 16 is provided in the outlet pipe 23.
b is connected from the lower side in the figure, and the air purified by the cleaner element 19 is supplied to the carburetor 16.

As shown in FIGS. 1 and 3, the base box 21 of the air cleaner 17 has, for example, two insertion holes 24a and 24b on its front side wall, and the insertion holes 24a and 24b are opened. Circular air seal 2 around the periphery
5, 26 are fitted and fixed to each other. Each of the air seals 25 and 26 is configured to be elastically deformable by forming the inner peripheral edge portions 25a and 26a of the wall thickness to be thinner than the outer peripheral edge portion.

On the other hand, for example, the two rectangular tube-shaped air ducts 27 and 28 are axially divided into front ducts 27a and 28a and rear ducts 27b and 28b, respectively, and these divided portions are axially separated by a seal joint or the like. And the rubber cylinders 29, 30 on the outer periphery of the joint.
Are tightly fitted and sealed airtightly.

The rear ducts 27b and 28b are slightly inserted into the insertion holes 24a and 24b of the base box 21, respectively, and the thin inner peripheral edge portions 25a and 26a of the air seals 25 and 26 are provided on the outer peripheral surfaces of the respective insertion tips. The rear ducts 27b and 28b are connected to the base box 21 of the air cleaner 17 so as to be detachable and attachable while being elastically deformable and airtightly adhered to each other for sealing.

Each of the rear ducts 27b and 28b has its tip (the left end in FIGS. 1 and 4) connected to the communication hole 3 of the rectangular tubular bifurcated branch 2b and 2c of the main frame 2 as shown in FIG.
Insert the inside of 1, 2 respectively, and this forked branch part 2
After extending to the outside of b and 2c and further extending to the front, they are connected to the front ducts 27a and 28a, respectively. The front end portions of the front ducts 27a and 28a are connected to the inner end portions of the left and right (upper and lower in FIG. 1) intake ports 14a and 14b of the front cowling 14 so as to be removable in the axial direction by means of a seal joint or the like. Is hermetically sealed by flexible urethane foam seals 33a and 33b.

As shown in FIG. 4, an intake port 34a of a hose-shaped air vent pipe 34 is opened in at least one intake port 14b of the front cowling 14, and this air vent pipe 34 is shown in the drawing. The right end portion is connected to the float chamber 16a of the carburetor 16 as shown in FIG. The intake port 34a of the air vent pipe 34 may be opened in the dirty side A of the base box 21 as shown by the broken line in FIG. 3, or may be opened in the clean side B on the front side of the cleaner box 18. You may let me.

Therefore, according to this embodiment, when the motorcycle 1 travels, outside air is introduced into the air ducts 27, 28 from the intake ports 14a, 14b of the front cowling 14 by the traveling wind pressure. Further, the introduced outside air is pressurized by the traveling wind pressure, and each air duct 27,
It is introduced from 28 into the dirty side A of the base box 21 of the air cleaner 17. Then, the introduced outside air is forcibly introduced into the dirty side A of the air cleaner 17 through the inlet pipe 22. The outside air introduced into the dirty side A is the cleaner element 19
Ventilates and flows into Clean Side B. At that time,
The cleaner element 19 removes and purifies foreign matter such as dust and water, and sucks it into the intake port 16b of the carburetor 16 through the outlet pipe 23.

As a result, the outside air pressurized to a pressure higher than the atmospheric pressure by the traveling wind pressure is sucked into the carburetor 16,
The density of the air-fuel mixture supplied to the engine 10 is increased, and the engine output is significantly increased.

On the other hand, since the traveling wind pressure applied to the clean side B of the air cleaner 17 is also applied to the float chamber 16a of the carburetor 16 via the air vent pipe 34, the traveling wind pressure is equal to the pressure in the venturi passage (not shown) of the carburetor 16. The pressure in the float chamber 16a becomes almost the same pressure, and the fuel is easily discharged to the venturi passage side, and an appropriate air-fuel ratio is obtained.

Since the outside air flowing in the air vent pipe 34 is cleaned by the air filter 35 interposed in the middle of the air vent pipe 34, foreign matters such as dust and water are not mixed in, and the foreign matters entering the float chamber 16a of the carburetor 16 are prevented. Is effectively prevented.

Since the rear ducts 27b and 28b are connected to the base box 21 of the air cleaner 17 so as to be freely inserted and removed in the axial direction, when the air cleaner 17 is detached from the rear ducts 27b and 28b, the rear ducts 27b and 28b are frontally attached. It can be easily removed by moving it to the cowling 14 side in the axial direction and pulling it out from the air cleaner 17. For this purpose, the air cleaner 17 itself is attached to the bifurcated branch portion 2 of the main frame 2.
Since it is not necessary to move the air cleaner 17 in the narrow space inside the b and 2c along the axial direction, the capacity of the air cleaner 17 can be increased and the clearance between the main frame 2 and the bifurcated branch portions 2b and 2c can be reduced. can do.

Further, by moving the front ducts 27a and 28a in the axial direction, the front cowling 14 is moved.
Can be removed from the respective intake ports 14a, 14b.
As a result, the detachability of the front cowling 14 and the ease of maintenance can be improved.

Further, the vibrations of the air ducts 27, 28 due to the vibration of the vehicle body during traveling can be absorbed by the flexible urethane seals 33a, 33b and the rubber cylinders 29, 30 and the airtightness can be maintained. Can be improved. Further, since the front ducts 27a and 28a and the rear ducts 27b and 28b are detachably connected, they can be easily attached and detached. As a result, maintenance of these ducts 27 and 28 can be easily performed.

Then, the insertion hole 24 of the air cleaner 17
The outer peripheries of the insertion portions of the rear ducts 27b and 28b, which are inserted into the a and 24b, are inserted into the insertion holes 24a of the air cleaner 17,
The thin inner peripheral portions 25a, 26a of the air seals 25, 26 fitted to the air conditioner 24b seal airtightly and tightly over the entire circumference, so that the air cleaner 17 and the rear duct 27 are sealed.
The airtightness of the connecting portion of b and 28b can be improved.

Further, the air seal thin-walled inner peripheral portions 25a, 25a are formed over the entire outer circumferences of the insertion portions of the rear ducts 27b, 28b.
Since the elastic duct 26a is elastically deformably attached to the air duct 26a, the air cleaner 17 and the communication holes 31 and 32 of the frame bifurcated branch portions 2b and 2c into which the rear ducts 27b and 28b can be inserted.
Even if there is some misalignment with the insertion holes 24a, 24b of the air seal, the misalignment is caused by the air seal thin inner peripheral portions 25a, 26a.
Since the air ducts 27 and 28 can be absorbed by the elastic deformation, the air ducts 27 and 28 can be easily attached to the air cleaner 17, and the airtightness of the air cleaner 17 can be improved.

[0036]

As described above, according to the invention of claim 1 of the present application, when the air cleaner is attached to and detached from the air duct, the air duct can be removed from the air cleaner, and the air cleaner itself can be branched into two main frames. Since it is not necessary to move along the axial direction of the air duct in a narrow space inside the portion, the capacity of the air cleaner can be increased and the gap between the main frame and the bifurcated portion can be reduced.

According to the second aspect of the present invention, the front duct can be removed from the intake port of the cowling by moving the front duct in the axial direction. As a result, the detachability of the cowling and the ease of maintenance can be improved.

According to the third aspect of the present invention, the vibration of the duct due to the vibration of the vehicle body during traveling can be absorbed by the flexible urethane foam material and the rubber sleeve, and the airtightness can be improved. In addition, the front duct and the rear duct can be easily attached and detached.

According to a fourth aspect of the present invention, the outer periphery of the insertion portion of the air duct inserted into the insertion hole of the air cleaner is formed by the thin inner periphery of the air seal fitted in the insertion hole of the air cleaner. Since it seals airtightly and tightly over the entire circumference, the airtightness of the air cleaner and duct connection can be enhanced, and the outer circumference of the air duct insertion section can be elastically deformed by the thin inner circumference of the air seal. Even if there is some deviation between the communication hole of the frame through which the air duct is inserted and the insertion hole of the air cleaner, it is absorbed by the elastic deformation of the thin inner peripheral part of the air seal. Therefore, the air duct can be easily attached to the air cleaner, and the airtightness of the air cleaner can be improved.

[Brief description of the drawings]

1 is a sectional view taken along the line I-I of FIG. 2, showing a main part of an outside air intake device for a motorcycle according to an embodiment of the present invention.

FIG. 2 is a right side view showing the overall configuration of a motorcycle to which the present invention is applied.

FIG. 3 is a partial vertical cross-sectional view of a main part of the embodiment shown in FIG.

FIG. 4 is a vertical cross-sectional view of another portion of the main part of the embodiment shown in FIG.

[Explanation of symbols]

 1 Motorcycle 2 Main Frame 2b, 2c Bifurcated Branch of Main Frame 10 Engine 14 Front Cowling 14a, 14b Front Cowling Inlet 16 Carburetor 16a Float Chamber 17 Air Cleaner 19 Cleaner Element 21 Air Cleaner Base Box 24a, 24b Base Box Insertion hole 25,26 Air seal 25a, 26a Thin inner peripheral edge portion of air seal 27,28 Air duct 27a, 28a Front duct 27b, 28b Rear duct 29, 30 Rubber tube 31, 32 Main frame communication hole 33a, 33b Urethane foam Foam seal 34 Air vent pipe 35 Air filter

Claims (4)

[Claims] 1. A cowling, which is disposed in front of a head pipe and has an intake port opened in a front surface thereof, and a main frame having a rectangular tubular shape which bifurcates and extends rearward from the head pipe. An air cleaner installed inside the bifurcated part of the frame and a communication hole that is connected to the intake port and communicates the inside and outside of the branched part of the main frame can be inserted into and removed from the insertion hole of the air cleaner. And an air duct connected airtightly to the outside air intake device for a motorcycle. 2. The outside air intake device for a motorcycle according to claim 1, wherein the air duct is formed by connecting a front duct and a rear duct, and the front duct is airtight so that it can be axially inserted into and removed from the intake port of the cowling. An outside air intake device for motorcycles characterized by being connected. 3. The outside air intake device for a motorcycle according to claim 2, wherein the connecting portion between the front duct and the cown intake port is sealed with a urethane foam sealing material, and the connecting portion between the front duct and the rear duct is made of rubber. An outside air intake device for a motorcycle, characterized in that a cylinder is externally fitted and sealed. 4. The outside air intake device for a motorcycle according to any one of claims 1 to 3, wherein the air cleaner has an insertion hole into which a communicating portion of the air duct is inserted, and an inner peripheral edge portion of the insertion hole. And an air seal having a thin inner peripheral portion that is elastically deformable and airtightly adheres to and seals the outer peripheral portion of the insertion portion of the air duct, which is thinner than the outer peripheral portion. A characteristic outside air intake device for motorcycles.