JPS6316852Y2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a float device for a carburetor, particularly to improvements in its shape.

Typically, a vaporizer is constructed as shown in FIG. The float chamber 1 communicates with the atmosphere through a vent 2, and the fuel is metered by the main jet 5 according to the flow velocity of the air flowing through the vent lily 4 according to the opening degree of the throttle valve 3, and is ejected from the main nozzle 6 and taken into the engine. . When the fuel in the float chamber 1 is consumed, the oil level 7 decreases, the float 9 supported by the cantilever lever 8 lowers, and the fuel entering the float chamber 1 from the fuel union 10 is controlled by the needle valve 11, causing the oil level to drop. The structure is such that the surface is maintained constant.

In the float of such a vaporizer, conventionally,
The float is composed of a simple rectangular parallelepiped shape, and when the vehicle drives on a rough or corrugated road, the carburetor receives large amplitude vibrations in addition to vibrations from the engine. and,
Both could no longer maintain the normal fuel cutoff state,
There were cases where the oil level rose or an overflow phenomenon occurred.

In order to deal with such a phenomenon,
The float shown in No. 33046 was devised, but it was made by combining three lumps together, and when such a float was used, it acted as if two of the three lumps were always on the oil surface. Therefore, when the oil level tilts toward the float lever installation side, a closing force that is more than necessary is applied, causing phenomena such as a delay in the flow of fuel into the float chamber even though the fuel in the float chamber is in use.

Therefore, the present invention aims to eliminate the above-mentioned drawbacks, that is, the float body supported by the cantilever lever 8 is provided with a single volume-enlarging portion 12.
is formed protrudingly in the opposite direction of the lever only at the upper end surface of the main body on the opposite side of the cantilever lever; It is characterized by being set so that it is immersed in the water.

As described above, in the present invention, when the vehicle is in a horizontal state, that is, when the vehicle is not in a state of turning, going up or down a slope, accelerating or decelerating, etc., the lever in relation to the oil level 7 in the float chamber is The lower surface of the volume expansion part 12 on the opposite side of 8 is in a state where it is slightly immersed below the oil level, and even when the oil level is inclined toward the lever installation side, an abnormal float buoyancy, that is, a closing force on the needle acts. It will never happen.

Furthermore, when the vehicle is traveling on rough or corrugated roads, the carburetor receives large amplitude vibrations from the vehicle in addition to the vibrations received from the engine, causing the float to be damaged by the top of the waves at the top of the oil level. The needle valve is pushed up and opened/closed with an impact, which temporarily prevents the needle valve 11 from maintaining the fuel cutoff state, and fuel is supplied into the float chamber 1, causing the oil level to rise or an overflow phenomenon to occur. However, when such a phenomenon occurs, the volume-expanding portion 12 of the float, which is slightly immersed below the oil level, is not affected by the top of the wave caused by vibration, and as the oil level rises, the fuel oil of the float increases. The immersion area increases, and its buoyancy increases significantly,
The force of the cantilever lever 3 to raise the needle valve 11 is increased. As a result, the needle valve 11
The closing force of is increased, preventing fuel from flowing into the float chamber 1 from the fuel union 10 more than necessary, and it is possible to reduce or eliminate oil level rise and overflow.

[Brief explanation of the drawing]

Fig. 1 is a sectional view showing the structure of the float chamber of a carburetor, Fig. 2 is a sectional view of the float chamber showing an example of a conventional float, and Fig. 3 is a sectional view of the float chamber showing the float of the present invention. It is a diagram. 1... Float chamber, 7... Oil level, 8... Cantilever lever, 9... Float, 11... Needle valve, 12... Volume expansion part.

Claims (1)

[Scope of utility model registration request] A single volume expanding portion 12 is formed on the float body supported by a cantilever lever 8 only at the end opposite to the cantilever lever on the upper end surface of the body and protruding in the opposite direction of the lever, and A float device for a carburetor, characterized in that the volume enlarged portion is set so that a part of its lower side is immersed under the oil surface under normal conditions.