JPH0431189A - Intake device for motor-bicycle - Google Patents

Abstract

PURPOSE:To improve charging efficiency of mixture by providing a cooler to positively cool intake air between an air cleaner and a mixture generator in an intake passage from an air cleaner to an engine through a mixture generator. CONSTITUTION:In an intake device of a motor-bicycle, from the upper stream side in order an air cleaner 19, a cooler 20, and a carburetor 21 are provided, the air cleaner 19 and the cooler 20 are connected with an air duct 22, and the air duct 22 is penetrated in the cooler 20 and extended behind (nearby) the carburetor 21. The cooler 20 is constituted so that the air duct 22 is penetrated through a cooler main body 23 of box construction made of aluminum material, aluminum alloy material, or the like, and refrigerant for example dry ice 24 is charged in the cooler main body 23. Intake air is positively cooled with dry ice 24, carbon dioxide gasified by removing heat from intake air is let flow out a seat cowl 13 through a gap between the cooler main body 23 and a cover 25, and discharged outside of the vehicle.

Description

DETAILED DESCRIPTION OF THE INVENTION [Object of the Invention] (Industrial Field of Application) The present invention relates to an air intake device for a motorcycle, and particularly to an air intake device for a motorcycle having a structure that can actively cool intake air.

(Prior Art) The intake system of a motorcycle has an air cleaner, a carburetor, etc., and is configured to take in and clean fresh air with the air cleaner, generate a mixture with the carburetor, etc., and guide this mixture to the engine. ing.

(Problem to be Solved by the Invention) In the intake system of a motorcycle as described above, the air cleaner takes in air warmed by radiant heat from the ground, exhaust heat from the engine, or by a radiator, oil cooler, etc. As a result, the air density (oxygen density) of this air (intake air) becomes low, reducing the filling efficiency of the air-fuel mixture, and there is a possibility that the engine will not be able to exhibit its original performance.

The present invention has been made in consideration of the above-mentioned circumstances, and an object of the present invention is to provide an intake system for a motorcycle that can cool intake air and allow the engine to exhibit its original performance.

[Structure of the invention]

(Means for Solving the Problems) The present invention includes a cooler that actively cools intake air between the air cleaner and the mixture generator in an intake passage leading from the air cleaner to the engine via the mixture generator. It is characterized by:

(Function) Therefore, according to the intake system for a motorcycle according to the present invention, the intake air taken in by the air cleaner is actively cooled by the cooler, so that the oxygen density in the intake air (air) increases. Therefore, the filling efficiency of the air-fuel mixture generated in the air-fuel mixture generator into the engine is improved, the engine output and torque are improved, and the original performance of the engine can be exhibited.

(Example) Embodiments of the present invention will be described below based on the drawings.

FIG. 2 is a side view showing a motorcycle to which a first embodiment of the intake device for a motorcycle according to the present invention is applied.

A body frame 1 of a motorcycle includes a main frame 2 having a lightweight construction and made of aluminum or aluminum alloy. This main frame 2 is of a twin beam type, and has a head pipe 3 fixed to its front end by welding and a pivot section 4 formed at its rear. Further, a down tube 5 is suspended from the lower front end of the main frame 2, and this down tube 5 is curved and extends rearward to a pivot portion 4.
is fixed to. The engine 6 is located in the area surrounded by the main frame 2, pivot part 4, and down tube 5.
will be installed.

A front fork 7 is attached to the head pipe 3 via a steering shaft (not shown) so as to be rotatable in the left-right direction of the vehicle, and a front wheel 8 is rotatably supported at the lower end of the front fork 7. A swing arm 9 is pivotally supported on the pivot portion 4 so as to be swingable in the vertical direction of the vehicle, and a rear wheel 10 is rotatably supported at the free end of the swing arm 9.

Above the main frame 2 is a fuel tank 11.
is arranged, and the base of a seat rail (not shown) is fixed to the rear upper part of the main frame 2. The seat rail extends obliquely upward toward the rear of the vehicle and supports the seat 12. A seat cowl 13 is installed extending from both sides of the seat rails to the rear thereof, and a cowling 14 is placed in front of the head pipe 3 and down tube 5. In FIG. 2, reference numeral 15 is a front fender, reference numeral 16 is a front fender, and reference numeral 17 is a radiator.

Now, the intake device 18 includes an air cleaner 19, a cooler 20, and a carburetor 21.

The air cleaner 19 and the cooler 20 are connected by an air duct 22, and the air duct 22 extends through the cooler 20 to the rear (near the vicinity) of the carburetor 21. Further, the air cleaner 19 takes in air, cleans it, and guides this air (intake air) to the carburetor 22. This carburetor 21 is configured as a mixture generator, and mixes intake air (air) guided by an air duct 22 with fuel to generate a mixture, and guides the mixture to the engine 6.

As shown in FIGS. 1 and 3, the cooler 20 has a box-shaped cooler body 23 made of aluminum or aluminum alloy, and an air duct 22 penetrates the cooler body 23.
A refrigerant such as dry ice 24 is filled inside. The opening of the cooler body 23 is covered by a lid 25 made of the same material as the cooler body 23 and removably attached to the cooler body 23 using a detachable tape such as a hook and loop fastener 26 .

As shown by arrow A in FIG. 2, the intake air flowing in the air duct 22 from the air cleaner 19 toward the carburetor 21 has its heat taken away by the dry ice 24 in the cooler 20, is actively cooled, and flows into the carburetor 21. Head towards. This increases the oxygen density in the intake air, causing the engine 6
This improves the filling efficiency and improves engine output and torque, allowing the engine to demonstrate its original performance.

Furthermore, since the hook-and-loop fastener 26 is non-sealing, the carbon dioxide that has been vaporized by absorbing heat from the intake air flows out into the seat cowl 13 through the gap between the cooler body 23 and the lid 25, and flows out into the seat cowl 13 as shown by the arrow in FIG. As shown in B, the gas is discharged from the vehicle through the open surface below the seat cowl 13.

Furthermore, since the air duct 22 extends close to the carburetor 21 and is not directly connected to the carburetor 21,
Even if water droplets are condensed in the intake air flowing through the air duct 22 by cooling the intake air by the cooler 20, the water droplets do not flow into the cab 21.

FIG. 4 is a cross-sectional view showing a modification of the cooler in the first embodiment. In this modification, the cooler main body 31 of the cooler 30 has a double structure consisting of an outer wall 32 and an inner wall 33, and dry ice 24 is filled between the outer wall 32 and the inner wall 33. Air cleaner 19 to cooler 3
The air duct 34 extending to 0 opens into the cooling chamber 35 surrounded by the inner wall 33, and the air duct 36 extending from the cooler 30 to the vicinity of the cabsitator 21 also opens into the cooling chamber 35.

The intake air that has passed through the air duct 34 enters the cooling chamber 35, is cooled by the dry ice 24, and is led to the vicinity of the cabsitor 21 through the air duct 36. Therefore, in the case of this modification as well, as in the case of the cooler 20 of the first embodiment, the oxygen density in the intake air can be increased, so that the original performance of the engine can be exhibited.

FIG. 5 shows a second intake system for a motorcycle according to the present invention.
FIG. 1 is a side view showing a part of a motorcycle to which an embodiment is applied. In this second embodiment, the same parts as those in the first embodiment are given the same reference numerals, and a description thereof will be omitted.

The cooler 40 of this second embodiment, as shown in FIG.
Similar to the cooler 30 of the modified example, the cooler main body 41 has an outer wall 4
2 and an inner wall 43, and the upper opening of the cooler main body 41 is covered with a lid 41A shown in FIG. The cooler main body 41 and the lid 41A are attached in a non-sealed state using hook-and-loop fasteners 26 similar to those in the first embodiment.

Further, a refrigerant such as dry ice 24 is filled between the outer wall 42 and the inner wall 43 of the cooler main body 41, and therefore the space surrounded by the inner wall 43 functions as a cooling chamber 44. The air duct 45 that connects the air cleaner 19 and the cooler main body 41 has its end on the cooler main body side opened into the cooling chamber 44 . Further, the venturi pipe 46 of the carburetor 21 is directly connected to the cooler main body 41, and the inlet side of the venturi pipe 46 opens into the cooling chamber 44.

With the above configuration, the intake air taken in by the air cleaner 19 passes through the air duct 45 into the cooling chamber 44 of the cooler 40, is cooled by the dry ice 24 of the cooler 40, and is then guided directly into the carburetor 21. Therefore, in the case of this second embodiment as well, the oxygen density of the intake air is increased, the filling efficiency of the air-fuel mixture into the engine is improved, and the engine output and torque can be improved, so that the original performance of the engine can be exhibited. can be done.

In both of the above embodiments, the mixture generator is the carburetor 2.
1, but it may also be a fuel injector.

〔Effect of the invention〕

As described above, according to the intake system for a motorcycle according to the present invention, a cooler is installed between the air cleaner and the mixture generator, and the intake air is actively cooled by the cooler, so that the oxygen density of the intake air is reduced. This increases the efficiency of filling the air-fuel mixture into the engine, allowing the engine to perform at its original performance.

[Brief explanation of drawings]

FIG. 1 is a sectional view taken along line I-I in FIG. 2, FIG. 2 is a side view showing a motorcycle to which a first embodiment of the intake device for a motorcycle according to the present invention is applied, and FIG. FIG. 2 is a perspective view showing a cooler in the intake system, FIG. 4 is a cross-sectional view showing a modified example of the cooler in the first embodiment, and FIG. A side view showing a part of the motorcycle to which the embodiment is applied, FIG.
■It is a sectional view along the line. 2... Main frame, 6... Engine, 18...
・Intake device, 19... Air cleaner, 20... Cooler, 21... Carburetor, 22... Air duct, 2
3... Cooler body, 24... Dry ice.

Claims (1)

[Claims] An intake system for a motorcycle, characterized in that a cooler for actively cooling intake air is installed between the air cleaner and the mixture generator in an intake passage leading from the air cleaner to the engine via the mixture generator.