JPH0814125A - Funnel for carburetor - Google Patents

Abstract

PURPOSE:To increase an air suction quantity into a carburetor by providing a plurality of air passages communicated to open air except an air intake port on the circumference of the air intake port of a funnel. CONSTITUTION:In a funnel 1, an air passage 6 forming a plurality of air passages 2 on the circumference of the end part 8 on the connecting part side to a carburetor of a passage 5 inside an outer wall 4 is communicated to an air passage 6 inside the funnel 1 beneath the passage 5, and the air passage is communicated to the outside of the funnel 1 through grooves 3 at the opening parts 2a. Namely in these air passages 2, open air taken from the passage 5 together with open air through the grooves from the side opening parts 2a are let flow to the passage 6. Hereby the quantity of open air sucked into the carburetor can be increased, and the engine speed can be raised from the medium speed territory to the high speed territory.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a carburetor funnel which is directly attached to an air (outside air) intake portion of a carburetor. More specifically, the present invention relates to a carburetor funnel that is directly attached to an air intake port of a carburetor to increase the amount of intake of outside air in a motorcycle or the like.

In the present invention, a motorcycle is used to mean a two-wheeled vehicle driven by an internal combustion engine (generally a gasoline engine) regardless of its displacement.

[0003]

2. Description of the Related Art In order to make a carburetor of a motorcycle inhale the atmosphere, there is a method of introducing the atmosphere sucked from an intake duct to the carburetor after passing through an air cleaner, and a method of introducing the atmosphere from a funnel provided in the carburetor. There is a method of directly inhaling into the carburetor.

Among the funnels used in the latter method, for example, a front view is shown in FIG.
A funnel 51 having a shape shown in a vertical sectional view in (b) is known. The funnel 51 has an air intake portion 55 which is opened in a substantially trumpet shape on the air intake side. The outside air drawn into the funnel 51 from the air intake port 55 is sent to a carburetor (not shown) in the direction of the arrow shown in FIG. 5B, is compressed and accelerated in the carburetor, and is mixed with gasoline. To be done. However, when inhaling the atmosphere using a conventional funnel, the so-called inhalation resistance limits the intake amount and the flow velocity of the taken-in atmosphere, thereby limiting the output of the engine.

It is an object of the present invention to provide a carburetor funnel which can increase the output of the engine by increasing the amount of air taken into the carburetor.

[0006]

Means for Solving the Problems The inventors of the present invention have made diligent studies on the shape of the flow path of the air taken in and the air flow in the vicinity of the air intake of the funnel for a carburetor of a motorcycle. It has been found that the amount of air sucked into the carburetor can be increased by providing a plurality of air passages, which are separate from the air intake port and are in communication with the outside air, around the. The present invention has been completed based on this finding.

That is, the present invention is (1) a carburetor funnel having an air intake portion, wherein the inside of the air intake portion and a portion below the opening end are provided around an opening end of the air intake portion on the carburetor connection portion side. One or more air passages that communicate with the inside of the funnel of
Further, each air passage has an opening to the outside of the funnel on its side surface, and the atmosphere taken in from the opening also flows into each air passage, (2) the air intake. The carburetor funnel according to (1), wherein a groove having an opening to the outside of the funnel on the side surface of each air passage is provided on the outer surface of the air passage, and (3) the air passage. 1 to
A carburetor funnel according to item (1) or (2), characterized in that 20 pieces are provided.

[0008]

The present invention will be described in detail below with reference to the illustrated embodiments, but the present invention is not limited to these.

1 (a), 1 (b), 2 (a) and 2 (b) show an embodiment of the carburetor funnel of the present invention. Here, the carburetor funnel 1 of the present invention has a front view in FIG. 1 (a) and a front view in FIG. 1 (b).
2 is a cross-sectional view taken along the line AA of FIG.
The bottom view is shown in FIG. The carburetor funnel 1 is a conventional funnel (see FIG. 5 (a), FIG.
It has substantially the same shape as (b), but further has a plurality of air passages 2 and a groove portion 3. Reference numeral 4 denotes an outer wall of the atmosphere intake portion, and the inside thereof is an air passage 5, which is open at two places, an outside air side end portion 7 and a carburetor connection portion side end portion 8. Since the diameter of the outside air side end portion 7 is larger than the diameter of the end portion 8 on the carburetor connecting portion side, the passage 5 has a shape that opens in a substantially trumpet shape toward the outside air side. In the funnel 1, a plurality (eight in the figure) of air passages 2 are formed around the end portion 8 of the passage 5 on the carburetor connection side, and the air passages 5 formed inside the outer wall 4 It is provided so as to communicate with the air passage 6 inside the lower funnel. That is,
The passage 5 and the passage 6 communicate with the carburetor connection side end portion 8 and the respective air passages 2, the passage 5 communicates with the outside air side end portion 7 and the passage 6 communicates with the outside through the carburetor connection port 9. . A groove 3 is provided on the outer periphery of the lower end of the outer surface of the outer wall 4, and each air passage 2 has an opening 2a into the groove 3 on its side surface. Each air passage 2 communicates with the passages 5 and 6 (in the vertical direction in the figure), and also communicates with the outside of the funnel 1 through the groove 3 at the side opening 2a. Therefore, in the air passage 2, the outside air taken in from the passage 5 and the outside air taken in through the groove 3 from the opening 2a on the side surface can flow together to the passage 6. FIG.
In (a) and FIG. 1 (b), 10 is a fastening portion of the funnel 1 to the carburetor body (not shown). In the figure, the inside is a hexagonal column type screw screw, but the structure of the fastening portion is shown. Is not limited to this, and it is sufficient that the funnel 1 can be fastened after being fitted to the carburetor body.

1 (a), 1 (b), 2 (a), and 2 (b) show a carburetor funnel 1 of the present invention having eight air passages 2. The number of 2 is not limited to this. That is, the number of the air passages 2 should be such that the air taken in from the air passages 5 can be sufficiently mixed with the air taken in through the groove 3 from the opening 2 a on the side surface of the air passage 2. In the carburetor funnel of the present invention, one or more air passages 2 are provided, but the number of air passages 2 is preferably 1 to 20,
More preferably, it is 3 to 16. The air passage 2 is provided by making a hole in the outer wall 4 with a drill, for example. The air passages 2 are preferably provided at equal intervals because the air flow taken in from the side can be made uniform between the air passages 2. When the carburetor funnel of the present invention is attached to the carburetor body, the air passage 2 may be located at any position with respect to the needle valve in the carburetor body as long as the funnel is fixed to the carburetor body, and there is no particular limitation. . For example, in the case of a funnel having one air passage 2, it can be arranged so that the air passage 2 is located on the needle valve guide side in the carburetor.

The groove 3 is provided below the outer wall 4 or at the lower end by a method such as cutting. The depth and width of the groove 3 are not particularly limited as long as the air passage 2 is open to the outside in the groove 3. By providing the grooves 3 to connect the air passages 2, the amount of air flowing from the openings 2a on the side surfaces of the air passages 2 is equalized, and the amount of the atmosphere flowing from the outside of the funnel is between the air passages 2. It becomes almost uniform.

FIG. 3 is a sectional view showing an embodiment of a state in which the funnel for a carburetor according to the present invention is attached to a carburetor body and a method of use. Funnel 1 of the present invention
Is directly attached to the air intake portion of the carburetor body 31. 32 is a needle valve (main jet) provided in the carburetor, and 33 is a needle valve guide. As shown by the arrow (frame) in FIG. 3, the atmosphere is taken into the carburetor from the funnel, mixed with fuel (gasoline) injected from the needle valve, and then sent to the engine (not shown). At that time, as shown by the arrow (solid line) in FIG. 3, the air flow passing through the air passage 2 has an opening 2 a on the side surface of the air passage 2 opened in the groove 3.
Atmosphere taken from is added. In this way, the outside air is further added to the air taken into the funnel from the side, so that the amount of air sucked into the carburetor increases.

Another embodiment of the carburetor funnel of the present invention is shown in a front view in FIG. 4 (a) and a sectional view in FIG. 4 (b). The funnel 41 does not have the groove. Air passages 45 and 4 in the funnel 41
6 is further communicated with a plurality of air passages 42. The illustrated air passages 42 include air passages 45 and 4
6 is open to the outside of the funnel at the lower part of the outer wall 44 of the atmosphere intake part and the body part of the funnel below the outer wall 44.

When the funnel 41 is connected to a carburetor (not shown), the outside air taken in from the air passage 45 in the air intake portion having a substantially trumpet shape is mainly passed through the passage 45.
Through the carburetor connecting portion side end portion 48 to the passage 46, but a part of the air passage 42 passes through the air passage 42.
At that time, the atmosphere is further added from the outside of the funnel through the opening to the outside of the air passage 42, and the intake amount of the air to the carburetor is increased.

In the drawing, the case where each air passage 42 passes through the outermost lower end of the outer wall 44 is shown. However, the position of the air passage 42 is not limited to this, and the passages 45 and 46 communicate with each other and open to the outside of the funnel. Any position will do.

In the present invention, the material of the carburetor funnel is not particularly limited and, for example, various conventionally used metals and alloys can be used. For example, it can be made of an aluminum alloy (A5052 or the like). Further, the size thereof is not particularly limited as long as it corresponds to the air intake portion of the carburetor to be applied.

The carburetor funnel of the present invention can be used in any carburetor that directly inhales air through the funnel, for example, a motorcycle carburetor.

[0018]

When the carburetor funnel of the present invention is directly attached to the carburetor of a motorcycle or the like and the engine is started to take in air, the air is taken into the funnel from a substantially trumpet-like air intake part of the funnel, and part of it is air. The air passing through the passage (for example, 2 in FIG. 1B) is sent to the inside of the funnel, and the air taken in from the side opening of the air passage is added to the air passing through the air passage. This is because, due to the so-called Venturi effect, when the engine is started and the cylinder is driven, the inside of the engine becomes negative pressure, and the inside of the communicating funnel also becomes negative pressure, and the negative pressure sucks the atmosphere around the funnel into the funnel. As a result, in addition to the air being sucked in from the air intake portion, the air outside the funnel is also sucked in from the opening on the side surface of the air passage. Here, if the funnel has a groove that connects the openings on the side surfaces of the air passages, the amount of air flowing from the outside through the groove into each air passage is equalized by the groove.

Since the amount of the air sucked from the funnel into the carburetor increases in this way, the density of the fuel gas inside the carburetor decreases, and the droplets of the fuel become finer, so that the combustion efficiency is improved, especially in the medium to high rotation speeds. In the region, the engine speed increases by about 1,500 rpm than usual. Furthermore, the suction of gas becomes smooth,
And the Venturi effect works well.

[0020]

EFFECTS OF THE INVENTION According to the carburetor funnel of the present invention, when the carburetor of a motorcycle or the like is directly attached to the air intake portion to suck air, the air taken in from the air intake portion of the funnel is further introduced from the side. The outside air can be added, and the amount of air sucked into the carburetor can be increased. Therefore, the rotation speed of the engine can be increased particularly in the middle to high rotation speed range.

[Brief description of drawings]

FIG. 1 shows an embodiment of a carburetor funnel of the present invention, FIG. 1 (a) is a front view, and FIG. 1 (b) is FIG. 2 (b).
It is sectional drawing by the AA line in the inside.

FIG. 2 shows an embodiment of a carburetor funnel of the present invention, FIG. 2 (a) is a plan view, and FIG. 2 (b) is a bottom view.

FIG. 3 is a cross-sectional view showing an embodiment of a carburetor funnel of the present invention attached to a carburetor body and a method of use.

FIG. 4 shows another embodiment of the carburetor funnel of the present invention, FIG. 4 (a) is a plan view and FIG. 4 (b) is a bottom view.

FIG. 5 shows an example of a conventional carburetor funnel, FIG. 5 (a) is a plan view, and FIG. 5 (b) is a bottom view.

[Explanation of symbols]

 1 Carburetor funnel 2 Air passage 2a Side opening of air passage 3 Groove 4 Outer wall of air intake 5 Air passage in air intake 6 Air passage 7 Air side end 8 Carburetor connection side end 9 Carburetor side open end 10 Fastening part 31 Carburetor body 32 Needle valve 33 Needle valve guide 41 Carburetor funnel 42 Air passage 44 Outer wall of atmosphere intake part 45 Air passage in atmosphere intake part 46 Air passage 48 Carburetor connection side end 51 Carburetor funnel 55 Air intake Air passage in the department

Claims (3)

[Claims] 1. A carburetor funnel having an atmosphere intake part, wherein the inside of the atmosphere intake part and the inside of the funnel below the opening end are connected to each other around the opening end of the atmosphere intake part on the side of the carburetor connection part. A carburetor funnel, characterized in that it comprises one or more air passages, and each air passage has an opening to the outside of the funnel on its side surface. 2. The funnel for a carburetor according to claim 1, wherein a groove having an opening to the outside of the funnel on the side surface of each air passage is provided on the outer surface of the air intake portion. 3. The carburetor funnel according to claim 1, wherein 1 to 20 air passages are provided.