JPH01247751A - Carburetter - Google Patents

Abstract

PURPOSE:To enable the respective first and secondary main jets to be easily attached and/or detached and exchanged only by taking off a drain plug, by arranging the respective first and secondary main jets and the drain plug of a float chamber on the same axis respectively. CONSTITUTION:A carburetter main body 1 is respectively provided with a throttle valve 3 and a choke valve 4 which are at the inside of an intake passage 2, and also, an air control valve 6 which is at a venturi portion 5. Also, slow fuel systems 7, 8, the first main fuel systems 9, 10 and the secondary main fuel systems 11, 12 are respectively provided. In addition, a float chamber 16 made up of a float 13 and a needle valve 14 or the like is provided. Under this constitution, the first and secondary respective main jets 9, 11 and the drain plug 17 of the float chamber 16 are respectively arranged on the same axis. And the first and secondary respective main jets 9, 11 are made attachable/ detachable by taking off the drain plug 17. As a result, the attachment/ detachment and exchange of the 1st and secondary respective main jets 9, 11 are made easy.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a carburetor for an internal combustion engine, and particularly to a carburetor that is suitable for serviceability.

[Conventional technology]

In the conventional system, as shown in FIG. 1 of Utility Model Publication No. 52-52105, the main jets are arranged downward in two main fuel systems in parallel.

[Problem to be solved by the invention]

The above-mentioned conventional technology does not take serviceability and assembly into consideration, and has the problem of requiring the main jet to be attached and detached by removing the float cover and facing downward.

An object of the present invention is to enable the main jet to be easily attached and detached.

[Means to solve the problem]

The above object is achieved by arranging the two main jets and the drain plug of the float chamber in a straight line, and making the outer diameter of the inner part smaller than the mounting hole diameter of the outer part.

[Effect]

The main jet in front can be attached and detached from the drain plug hole in the float chamber. The main jet on the back side is
It can be attached and detached from the main jet in front and the hole where the drain plug is attached. As a result, the two main jets can be attached and detached simply by removing the drain plug without removing the float cover.

〔Example〕

An embodiment of the present invention will be described below with reference to FIG. 1st
In the figure, a carburetor main body 1 has a throttle valve 3 in an intake passage 2.
It has a choke valve 4, a rotatable air control valve 6 in the venturi part 5, which is the narrowest part, and a slow fuel system consisting of a bypass hole 7, an idle hole 8, etc., and a primary main air bleed (Fig. (not shown), a primary main fuel system consisting of a primary main jet 9 and a primary main nozzle 10;
The oil level is kept constant by a secondary main air bleed (not shown), a secondary main fuel system consisting of a secondary main jet 11, a secondary main nozzle 12, a float 13, a needle valve 14, etc. and a float chamber 16 formed below the intake passage 2 by the float cover 15. Furthermore, the float cover 15 includes:
Drain plug 17 for draining fuel in the float chamber 16
is configured.

Here, the fuel flow rates of the two main fuel systems are determined by the negative pressure generated by the ventilation area of the venturi section 5 formed by the carburetor main body 1 and the air control valve 6 and the amount of air flowing through the venturi section 5, and the negative pressure generated by the amount of air flowing through the venturi section 5. The pressure is determined by bleed, jet, etc., and the secondary main nozzle 12 is placed at a position where the negative pressure is lower than that of the primary main nozzle 1o, and is configured to act with a delay.

The air control valve 6 also has a lever 19 that is attached to the rotation shaft 18 and always rotates together with the rotation shaft 18.
is connected by an actuator 21 and a rod 22 that are operated by pressure introduced from a negative pressure hole 20 provided in the venturi part 5, and the negative pressure of the venturi part 5 opens and closes appropriately according to the operating state of the engine. is configured to be

In addition, the primary main jet 9, the secondary main jet 1
1. The drain plugs 17 are arranged on the same line and have the same attachment/detachment direction.Moreover, the outer diameter of the primary main jet 9 is smaller than the diameter of the lower screw hole of the secondary main jet 11, and the outer diameter of the secondary main jet 11 is smaller than that of the drain plug 17. It is smaller than the diameter of the lower screw hole.

Next, the operation of the present invention will be explained with reference to FIG.

FIG. 2 represents a conventional vaporizer. The primary and secondary main jets 23 and 24 were each mounted vertically downward. In such a carburetor, the float cover 25 must be removed to attach and detach the two main jets, and when the engine is installed, there are often other obstacles below the carburetor, so the entire carburetor must be removed. In many cases, it is impossible to replace the main jet without removing it from the engine. However, according to the present invention shown in FIG. 1, the primary main jet 9 and secondary main jet 11 can be attached and detached simply by removing the drain plug 17 from the carburetor.
The two main jets can be replaced very easily, which has the effect of greatly improving serviceability.

〔Effect of the invention〕

According to the present invention, since the main jet can be replaced simply by removing the drain plug, serviceability is improved.

[Brief explanation of the drawing]

FIG. 1 is a main sectional view of a carburetor according to an embodiment of the present invention, and FIG. 2 is a main sectional view of an example of a conventional carburetor. DESCRIPTION OF SYMBOLS 1... Carburetor body, 2... Intake passage, 3... Throttle valve, 4... Choke valve, 5... Venturi section, 6...
・Air control valve, 7... Bypass hole, 8... Idle hole, 9... Primary main jet, 10...
Primary main nozzle, 11... Secondary main jet, 1
2... Secondary main nozzle, 13... Float, 14
... Needle valve, 15... Float cover, 16... Float chamber, 17... Drain plug, 18... Rotating shaft, 19... Lever, 20... Negative pressure hole, 21・・・
・Actuator, 22... Rod, 23... Primary main jet, 24... Secondary main jet, 25
...Float cover. Figure 1 zt / Figure 2

Claims (1)

[Claims] 1. Measuring the fuel flow rate ejected from the float chamber configured below the intake passage of the carburetor body, the two main nozzles opened in the venturi part in the intake passage, and the main nozzle opened in the float chamber. In a carburetor having two main fuel systems consisting of two main jets, etc., the two main jets and the drain plug of the float chamber are arranged in a straight line, and the two main jets connect the drain plug from the outside of the float chamber. A vaporizer characterized by being configured so that it can be attached and detached by removing it.