JP2512849Y2 - Vaporizer starting fuel supply device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial application] The present invention relates to a starting fuel supply device for a carburetor.

[Conventional technology]

Generally, an internal combustion engine has a low outside air temperature at startup,
Under conditions where engine warm-up is not sufficient, it is desirable to increase the concentration of the air-fuel mixture sent to the engine,
In order to cope with this, conventionally, a carburetor is provided with a starting device such as a choke valve or a starter, and at the time of starting, these are operated to generate a starting air-fuel mixture and supply it to the engine.

[Problems of conventional technology]

However, in the above-mentioned starting device, the driver must operate the choke valve or the starter when starting the engine, and after starting the engine, it is necessary to feel the operating state of the engine and return the choke valve or the starter. Not only does it require considerable skill to start.

The present invention relates to a starting fuel supply device for a carburetor that can easily start an engine without requiring a complicated starting operation.

[Means for Solving Problems] In the present invention, the fuel tank is arranged at a position higher than the carburetor,
A pump chamber is provided in the middle of the fuel passage for supplying fuel from the fuel tank to the fuel chamber of the carburetor, and the pump chamber is connected to the intake passage of the carburetor through a check valve that opens at a certain pressure or higher. It is characterized in that the chamber is provided with a plunger for compressing the fuel by an external operation and discharging the fuel to the intake passage of the carburetor through the check valve.

[Action]

When the fuel cock is opened and fuel is sent to the fuel chamber of the carburetor at the time of starting the engine, the fuel in the fuel tank flows into the fuel chamber of the carburetor through the pump chamber, and the pump chamber is filled with fresh fuel.

Therefore, when the plunger is operated to compress the fuel in the pump chamber, the fuel is discharged to the intake passage of the carburetor through the check valve to increase the mixture concentration.

〔Example〕

 Embodiments of the present invention will be described below with reference to the drawings.

 FIG. 1 is a vertical sectional view showing an embodiment of the present invention.

Reference numeral 1 is a carburetor, and an intake passage 3 is provided in the carburetor body 2.
Is provided so as to penetrate therethrough, and the downstream side of the intake passage 3 is connected to an intake port of an engine (not shown). Further, the intake passage 3 is provided with a throttle valve 4 which enables the effective diameter of the intake passage 3. A fuel chamber 5 is provided below the intake passage 3, and the fuel chamber 5 is connected to the intake passage 3 by a fuel nozzle 6. 7 is a fuel tank provided at a position higher than the vaporizer, and 8 is fuel in the fuel tank 7 and is in a fuel chamber 5 of the vaporizer.
Is a fuel passage for leading to the fuel chamber, 9 is a fuel valve provided in the fuel chamber 5 for controlling the opening and closing of the fuel passage 8, and 10 is a fuel cock.

A starting fuel supply device 11 according to the present invention is provided in the middle of the fuel passage 8.

The starting fuel supply device 11 includes a fuel storage chamber 12 provided in the middle of the fuel passage 8, a pump chamber 13 having one end open to the storage chamber 12, and usually a pump chamber 13 that is pulled out from the pump chamber 13 by an external operation. A plunger 14 that is inserted into the pump chamber 13 and compresses the fuel in the chamber 13 and a start that feeds the fuel compressed in the pump chamber 13 to the intake passage 3 of the carburetor through the check valve 15. And a fuel passage 16. The check valve 15 is elastically urged by a spring 17 so that it does not open below a certain pressure.

 Next, the operation of the above embodiment will be described.

When the fuel cock 10 is opened and the fuel is sent to the fuel chamber 5 of the carburetor when the engine is started, the fuel in the fuel tank 7 flows into the fuel chamber 5 of the carburetor through the fuel storage chamber 12 and the pump chamber 13, The fuel storage chamber 12 and the pump chamber 13 are filled with fresh fuel.

Then, when the plunger 14 is pushed, the plunger 14 is inserted into the pump chamber 13, the fuel in the pump chamber 13 is compressed, and the fuel passes through the check valve 15 to the intake passage 3 of the carburetor. It is discharged and the mixture concentration is increased. Therefore, since the fresh fuel is always discharged to the intake passage 3 by operating the plunger 14, the engine can be started easily.

Further, since the air-fuel mixture having the normal concentration is automatically obtained after the start, it is possible to eliminate the troublesome operation after the start.

Further, since the fuel flowing from the fuel tank 7 into the fuel chamber 5 of the carburetor always passes through the fuel storage chamber 12 and the pump chamber 13, fresh fuel is always stored in the fuel storage chamber 12 and the pump chamber 13. .

FIG. 2 shows an embodiment in which the fuel passage 8 is directly connected to the pump chamber 13. In this case, when the plunger 14 is pushed, the openings 8a, 8b of the fuel passage 8 are located on the back surface or the side surface of the plunger 14, the pump chamber 13 is shut off from the fuel passage 8, and the amount of fuel in the chamber 13 is kept constant. Then, the fuel is fed to the intake passage 3 of the carburetor through the starting fuel passage 16.

FIG. 3 shows an embodiment in which a protrusion 18 is provided on the tip of the plunger 14 and the check valve 15 is opened by the protrusion 18 when the plunger 14 is pushed.

[Effect of device]

As described above in detail, according to the present invention, when starting the engine, a certain amount of fresh starting fuel is discharged into the intake passage of the carburetor, so that the mixture concentration at the time of starting can be increased.
The engine can be easily started.

Further, since the air-fuel mixture having the normal concentration is automatically obtained after the engine is started, the conventional troublesome starting operation can be eliminated.

Further, since the fuel flowing from the fuel tank into the fuel chamber of the carburetor always passes through the fuel storage chamber and the pump chamber, fresh fuel is always stored in the fuel storage chamber and the pump chamber, and as a result, ignitability A high rich air-fuel mixture can be generated, and the startability of the engine is improved.

[Brief description of drawings]

FIG. 1 is a vertical cross-sectional view showing an embodiment of the present invention, and FIGS. 2 and 3 are main-part cross-sectional views showing another embodiment of the present invention. 1 ... Vaporizer, 3 ... Intake passage, 8 ... Fuel passage, 13 ...
Pump chamber, 14 …… Plunger, 15 …… Check valve, 16 ……
Starting fuel passage.

Claims (1)

(57) [Scope of utility model registration request] 1. A fuel tank is arranged at a position higher than a carburetor,
A pump chamber is provided in the middle of a fuel passage for supplying fuel from the fuel tank to the fuel chamber of the carburetor, and a plunger that is operable from the outside and compresses the fuel in the pump chamber is provided in the pump chamber. A starting fuel supply device for a carburetor, characterized in that the chamber and the intake passage of the carburetor are connected by a starting fuel passage having a check valve that opens at a certain pressure or higher.