JPS6353373B2 - - Google Patents

Description

[Detailed description of the invention] The present invention relates to a vaporizer.

A conventional carburetor has a fuel jet opening into an intake passage, a bleed pipe for communicating the fuel jet below the fuel oil level in a float chamber, a bleed holder portion surrounding and supporting the fuel jet, and a float valve seated thereon. The valve seat portion and the portion that pivotally supports the float are either integrally formed with the carburetor main body or are individually screwed to the carburetor main body.

For this reason, the shape of the carburetor body becomes complicated, making the casting work cumbersome, or the work of drilling holes or forming screw holes in the molded carburetor body increases.

The present invention has been made in view of the above points, and its gist is to provide a bleed holder portion that surrounds and supports the above-mentioned fuel nozzle, bleed pipe and fuel jet, a float valve seat portion on which the float valve is seated, and A carburetor characterized in that the pivot part that swingably supports the float is made of a synthetic resin integral molding that can be integrally attached to the carburetor body, and its purpose is to Another object of the present invention is to provide a carburetor that facilitates the work of casting the carburetor body and eliminates as much as possible the work for forming holes and screw holes related to each of the above-mentioned parts.

Next, embodiments of the present invention will be described in detail with reference to the accompanying drawings.

The carburetor 1 includes a carburetor main body 2 made of a light alloy, and a float chamber body 5 that is detachably attached to the lower part of the carburetor main body 2 via a pair of connectors 3 and forms a float chamber 4. An intake passage 7 having a bench lily portion 6 formed in the center passes through the carburetor main body 2, and a choke valve 8 and a throttle valve 9 are provided in the intake passage 7, which are arranged opposite to each other with respect to the bench lily 6.

In the lower part of the carburetor main body 2, there is a fuel nozzle 10 opened to the intake passage 7, a bleed pipe 12 in which an air bleed hole 11 is bored for communicating the fuel nozzle 10 below the fuel oil level L, and A fuel jet 13 is provided. These fuel nozzles 1
0, the bleed pipe 12, and the fuel jet 13 are supported by a bleed holder portion 14 surrounding them, and the fuel jet 13 is
It is supported by being biased toward the bleed pipe 12 by a spring member 15 interposed between the fuel jet 13 and the bottom surface of the float chamber 4.

A float 18 is swingably supported in the float chamber 4 by a pin 17 passed through the pivot portion 16. This float 18 has a coil spring 2 which is displaced in conjunction with the rocking displacement of this float 18 and is attached to the float valve seat 19 side.
A float valve 21 energized via 0 is supported.

Now, the present invention provides the above-mentioned bleed holder portion 14 and the pivot portion 1 of the pin 17 in such a carburetor.
6. The float valve seat portion 19 is integrally molded from synthetic resin to form an integral body. That is, the fuel nozzle 10, the bleed pipe 1
2. The bleed holder part 14 that surrounds and supports the fuel jet 13, the float valve seat part 19 where the float valve 21 is seated, and the pivot part 16 of the pin 17 are not integrally formed on the carburetor main body 2 side, but only these parts are formed. integrally molded with synthetic resin 2
2, which is integrally attached to the carburetor main body 2. When installing the carburetor to the main body 2, insert the O-ring 2 between the carburetor main body 2.
The manner of attachment is shown in FIGS. 3, 4, and 5, respectively. That is, in the case shown in FIG. 3, a protrusion 24 formed on the carburetor main body 2 is fitted into a through hole 25 of the integral molding 22, and the tip of the protrusion 24 is attached by caulking. The one shown in FIG. 4 is attached to the carburetor main body 2 via a rivet 26. Furthermore, the example shown in FIG. 5 is one that is attached to the carburetor main body 2 using a screw member 27. In the case of the example shown in FIG. 5, the integrally molded article 22 can be attached to and removed from the carburetor main body 2, which is convenient for cleaning the inside of the integrally molded article 22.

Note that a low-speed fuel passage 29 may be formed in the bleed holder portion 14, which communicates with a low-speed fuel jet port 28 that opens into the intake passage 7.

As described above, the present invention includes the bleed holder portion 14 that surrounds and supports the fuel nozzle 10, bleed pipe 12, and fuel jet 13, and the float valve seat portion 19 on which the float valve 21 is seated.
In addition, the pivot portion 16 that swingably supports the float 18 is made of synthetic resin and is integrally molded 22, and is attached to the carburetor body 2 as one piece, so that the structure of the carburetor body 2 itself can be changed. Since it is simple, the casting work of the carburetor body becomes easier, and
In this connection, operations for drilling and forming screw holes are simplified as much as possible. Moreover, since the integrally molded parts 22 of the above-mentioned parts are molded from synthetic resin, they are easy to process and are prevented from being corroded by moisture contained in the fuel oil.
Further, since the valve seat portion 19 and the pivot portion 16 that swingably support the float 18 are integral, the relationship between the pivot positions of the float valve seat and the float arm is accurately determined in advance. Therefore, the relationship between the float devices is accurately determined in advance. Therefore, it has various advantages such as easy assembly of the float device and good accuracy.

[Brief explanation of the drawing]

The attached drawings show embodiments of the present invention, in which FIG. 1 is a longitudinal side view, FIG. 2 is a cross-sectional view of the main part taken along the line - in FIG. 1, and FIGS. 3 to 5 show an integrally molded product. 2
2 is a partial cross-sectional view showing the manner in which the carburetor body 2 is attached to the carburetor body 2. FIG. 2... Carburetor body, 4... Float chamber, 5...
Float chamber body, 7... Intake path, 10... Fuel nozzle, 12... Bleed pipe, 13... Fuel jet, 14... Bleed holder portion, 16... Part that swingably supports the float, 17 ……pin,
18...Float, 19...Float valve seat portion, 21...Float valve, 22...Integrated product, 28...Low speed fuel injection port, 29...Low speed fuel passage.

Claims (1)

[Scope of Claims] 1. A float chamber body 5 forming a float chamber 4 is detachably attached to a carburetor main body 2 in which an intake passage 7 is formed, and a fuel nozzle 10 is opened to the intake passage 7.
is communicated with the fuel oil level L of the float chamber 4 through the bleed pipe 12 and the fuel jet 13,
In the carburetor, fuel is supplied to and cut off from the float chamber 4 by a funnel valve 21 that is linked to a float 18 moored in the float chamber 4 so as to be moored therein, the fuel nozzle 10, the bleed pipe 12, and a bleed holder portion 14 that surrounds and supports the fuel jet 13, and the float valve 2.
1 is seated on a float valve seat portion 19,
Furthermore, the carburetor is characterized in that the pivot portion 16 that swingably supports the float 18 is made into an integrally molded synthetic resin member 22 that can be integrally attached to the carburetor body 2. 2. The vaporizer according to claim 1, wherein the synthetic resin integrally molded article 22 is attachable to and detachable from the vaporizer main body 2. 3. The vaporizer according to claim 1 or 2, wherein the bleed holder portion 14 is formed with a low-speed fuel passage 29 that communicates with a low-speed fuel jet port 28 that opens into the intake passage 7. vessel.