JPS5847238Y2 - multi cylinder multi carburetor engine - Google Patents

Description

[Detailed description of the invention] The present invention is a multi-cylinder multi-unit system in which a plurality of cylinders are each provided with a carburetor equipped with an air horn, and each of these carburetors is connected to an air cleaner located upstream via each air horn. Concerning improvements in carburetor engines.

In recent years, as motorcycles have become larger, there has been a tendency for motorcycles to be equipped with the above-mentioned multi-cylinder, multi-carburetor engines.

In this case, strict regulation of fuel supply and prevention of release of vaporized fuel into the atmosphere are required, especially to deal with air pollution.

For this reason, the air vent of the float chamber of each vaporizer must be of the inner air vent type.

However, in this method, each of the air vents must be connected to the air cleaner, and the piping of these connecting pipes becomes complicated, and the mounted multi-cylinder, multi-carburizer engine itself protrudes from the vehicle body. The appearance of the motorcycle is also spoiled by the piping.

The purpose of the present invention is to provide a multi-cylinder multi-carburizer engine of this type, in which the connecting pipes are arranged in a manner that simplifies the piping and does not impair the appearance of the motorcycle. Furthermore, it is an object of the present invention to provide a multi-cylinder, multi-carburetor engine with stable characteristics with little pressure fluctuation in the float chamber of each carburetor.

Hereinafter, one embodiment of the present invention will be described based on the drawings.

In the drawing, the symbol E indicates a multi-cylinder multi-carburizer engine, and this multi-cylinder multi-carburizer engine E has four cylinders
0, 11, 12, 13, four carburetors 20, 21, 22, 23 communicating with each of these cylinders 10-13, and an airbone 30 of each of these carburetors 20-23.
, 31, 32, and 33.

Adjacent vaporizers 20 and 21 among the four vaporizers 20 to 23 are connected to the two open ends of the T-shaped connecting pipes 500 at the air vents 20a and 21a of their float chambers, and The remaining open end of 50 is connected to the air vent 40a of the air cleaner 40 via the auxiliary vibro 0.

In addition, the adjacent vaporizers 22 and 23 also have air vents 22a and 23a of their float chambers in the same manner as described above.
The two open ends of the connecting pipe 510 are connected to each other, and the remaining open end of the connecting pipe 51 is connected to the air vent 40b of the air vent 40 via the auxiliary vibro 1.

Each air vent) 40a, 40b of the air cleaner 40 is
It is provided on the wall portion 40c facing each of the vaporizers 20-23.

On the other hand, each of the air horns 30 to 33 hermetically penetrates the wall portion 40c of the air cleaner 40 and protrudes into the interior of the air cleaner 40, and each of the air horns 30 to 33 protrudes into the interior of the air cleaner 40.
33a is located upstream of the intake air vents 40a and 40b.

Therefore, the connecting pipe 50 and the auxiliary vibro 0 are separated,
The air in the air cleaner 40, which is less affected by intake pulsation, is distributed to the float chambers of the carburetors 20 and 21, and the connecting pipe 51 and the auxiliary vibro 1 distribute the air in the air cleaner 40 to the float chambers of the carburetors 22 and 23. distributed into the chamber.

In the drawings, reference numeral 41 indicates an air cleaner element, 42 indicates an air introduction pipe, and 10 indicates a fuel tank.

In this way, in this embodiment, two adjacent vaporizers 2 are connected by using the T-shaped connecting pipe 50 and the auxiliary vibro 0.
0, 21 float chamber air vent) 20a, 21
a, the air vent 4Qa of the air cleaner 40, and the air vents 22a of the float chambers of the two adjacent carburetors 22, 23 using the 7-shaped connecting pipe 51 and the auxiliary pipe 61.

23a and an air vent 40b of the air cleaner 40 are connected to distribute the air inside the air cleaner 40 to each float chamber.

Therefore, in this embodiment, the number of connecting pipes from the float chamber of the vaporizer to the air cleaner is halved, the piping of the connecting pipes is simplified, and the connecting pipe is connected between each vaporizer. Therefore, the connecting pipe is hidden by the carburetor and is not visible from the outside, especially from the side of the car body.
The external appearance of the motorcycle is not impaired by the connecting pipe.

In addition, in this embodiment, each air horn 30 to 3
The opening ends 30a to 33a of the air cleaner 40 are located upstream of the air vents 40a and 40b of the air cleaner 40, respectively.

Therefore, if there is a button inside the air cleaner 40, the engine
Each air horn 30 to 3 is
Air flows toward the open ends 30a to 33a of the air vents 40a to 33a of the air vents 40a to 33a, and the pulsation of intake air hardly affects the arrangement portions of the air vents 40a and 40b.

Therefore, pressure fluctuations in each float chamber of each carburetor 20 to 23 are small, and stable engine characteristics can be obtained.

In addition, in the present invention, instead of the T-shaped connecting pipe, a 7-shaped connecting pipe or other connecting pipes of various shapes having open ends on three sides can be used, and it is also possible to use a connecting pipe that is integrated with the auxiliary pipe. Connecting pipes can also be used.

Furthermore, the present invention can be applied to various types of multi-cylinder multi-carburetor engines, and in particular, for engines with an odd number of carburetors such as 3 or 5, the present invention is applied to two adjacent carburetors. However, for the remaining one vaporizer, conventionally known connection means may be used.

In summary, according to the present invention, the air vents of the float chambers of two adjacent carburetors of each carburetor are connected to two connecting pipes having open ends on three sides. At the same time, the remaining open ends of the connecting pipes are connected to air vents provided on the wall facing each vaporizer of the air cleaner, and each air horn is passed through the wall of the air cleaner to connect them. Each opening end is located inside the air cleaner on the intake upstream side like the air vent of the air cleaner, and the air in the air cleaner is distributed to each float chamber of the two carburetors through the connecting pipe. It has characteristics.

(According to JL, with this invention, the number of connecting pipes connecting the float chamber of the carburetor and the air cleaner can be reduced by about half, simplifying the piping of the connecting pipes, and connecting pipes can be connected from the outside. It can be located in an area that is difficult to see and does not spoil the appearance of the motorcycle.

Furthermore, since the float chamber of each carburetor is communicated with a portion of the air cleaner that is less affected by intake pulsation, stable engine characteristics are obtained with less pressure fluctuation within each float chamber.

[Brief explanation of drawings]

FIG. 1 is a partially cutaway plan view showing the main parts of the present invention, and FIG. 2 is a cross-sectional view taken along the vertical line 1--2 in FIG. Explanation of symbols, E...Multi-cylinder multi-carburetor engine,
10-13...Cylinder, 20-23...
Vaporizer, 20a-23a... Air vent of float chamber, 30-33... Air horn of vaporizer, 30a-33a... Open end, 40...
...Air cleaner, 40a, 40b...Air vent h40c...Wall, 50.51...
・T-shaped connecting pipe, 60.61...Auxiliary pipe.

Claims (1)

[Scope of utility model registration request] In a multi-cylinder multi-carburetor engine in which each of a plurality of cylinders is provided with a carburetor equipped with an air horn, and each of these carburetors is connected to an air cleaner located on the upstream side via each of the air horns, each of the carburetors is The air vents of the float chambers of the two adjacent carburetors are connected to two open ends of a connecting pipe having three-sided open ends, and the remaining open ends of the connecting pipe are connected to a wall portion facing each of the vaporizers of the air cleaner. connected to an air vent provided in the air cleaner, and passing each of the air horns through the wall of the air cleaner so that each of the open ends thereof is located inside the air cleaner on the intake upstream side of the air vent of the air cleaner,
A multi-cylinder multi-carburetor engine, characterized in that air in the air cleaner is distributed to each float chamber of the two carburetors through the connecting pipe.