JPH0346215Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Field of Application] The present invention relates to an improvement of a fuel tank used in a free-fall fuel supply type engine.

[Problems that conventional technology and ideas try to solve]

Generally, in general-purpose engines, a method is often used in which the fuel tank is placed above the float chamber of the carburetor with a head difference, and fuel is supplied to the float chamber of the carburetor by free fall (gravitational dripping). . However, with this free-fall fuel supply method, there is no problem if there is no restriction on the overall height of the engine, but there are restrictions on the overall height in cases such as engine-driven generators, engine-driven welding machines, or when the engine is stored in a soundproof case. Even in this case, the bottom surface of the fuel tank needs to be placed above the float chamber of the carburetor, so the fuel tank is subject to more volume constraints. becomes.

Examples of prior art related to this fuel tank include Japanese Utility Model Application Publication No. 145271/1982 and Publication No. 173439/1983, but both are pumped and supplied by a fuel supply pump, and there are restrictions on the overall height. This is not an attempt to expand the volume while accepting the current situation.

[Purpose of invention]

The present invention was developed in view of these circumstances, and is a free-fall fuel supply system that allows the fuel tank to be expanded to a position lower than the float chamber of the carburetor, increasing the volume and reducing operating time. The purpose of the present invention is to provide a fuel tank that can be extended and keep the overall height low.

[Means for solving problems and their effects]

In order to achieve the above object, the fuel tank according to the present invention is a free-fall fuel supply type fuel tank, in which a partition plate is installed horizontally near the lower limit where fuel can be dripped into the float chamber of the carburetor by gravity, and the upper chamber is separated from the upper chamber. This upper chamber is separated into a lower chamber having a smaller capacity, and a supply port for supplying fuel to the carburetor float chamber is formed at the bottom of the upper chamber, while a communication port is provided in the partition plate to communicate the upper chamber and the lower chamber. is provided, and a circumferential weir is erected around this communication port toward the upper chamber side.

In this configuration, fuel fills the lower chamber and then is stored in the upper chamber, and fuel is supplied to the carburetor float chamber in a free-fall manner from a supply port provided at the bottom of the upper chamber. When the fuel stored in the upper chamber has been supplied, tilt the fuel tank to supply the fuel stored in the lower chamber from the communication port into the upper chamber, and then return the tank to the horizontal position to supply it from the lower chamber. The fuel supplied into the upper chamber is retained and stored within the upper chamber by a weir installed around the communication port. For this reason, the lower chamber portion of the fuel tank can be expanded to a position lower than the carburetor float chamber.

[Example of idea]

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

Figures 1 to 4 show an engine-driven generator equipped with a fuel tank according to an embodiment of the present invention, with Figure 1 being a cutaway front view of the fuel tank, and Figure 2 showing the inside of the upper chamber of the fuel tank. FIG. 3 is a cutaway side view of the main part showing a state in which the fuel is empty; FIG. 3 is a cutaway side view of the main part showing a state in which the fuel tank in the state of FIG. FIG. 4 is a cutaway side view of the main part showing the fuel tank of FIG. 3 in a state where it has been returned to a horizontal position.

In this embodiment, an example is shown in which the fuel tank 1 is mounted on an engine-driven generator 2. This engine-driven generator 2 is constructed by disposing a forced air-cooled engine 3 and a generator 4 on a substrate 5 via a vibration isolating member 6, and connecting the output shaft of the engine 3 to the rotor shaft of the generator 4. .
The board 5 includes a pair of front and rear frames 7,
7, while reinforcing frames 8, 8 are installed on the left and right upper sides of this pair of frames 7, 7.
has been erected.

The fuel tank 1 is arranged in an empty space above the generator 4 or the engine 3 within the frames 7, 7, as shown in FIG.
Tank flange part 10 is attached to frame plate 9, 9 attached to 7.
is attached and fixed by any attachment means such as screwing means. This fuel tank 1 has a partition plate 13 installed horizontally near the lower limit where fuel can be dripped into the float chamber 12 of the carburetor 11 of the engine 3 by gravity, and has an upper chamber 1a and a lower chamber with a smaller capacity than the upper chamber 1a. It is separated into chamber 1b. Therefore, the bottom of the upper chamber 1a is located above the float chamber 12 of the carburetor 11, and a fuel tube 16 with a fuel supply port 14 formed therein and a fuel strainer 15 interposed therebetween. Connect one end of the
The other end of the tube 16 is connected to the float chamber 12 of the carburetor 11 . The partition plate 13 includes:
For example, four communication ports 17 are formed to communicate the upper chamber 1a and the lower chamber 1b, and a circumferential weir 18 is erected around the communication ports 17 toward the upper chamber 1a. Further, since the lower chamber 1b does not directly supply fuel from the lower chamber 1b to the float chamber 12 of the carburetor 11 in a free fall manner, it may be located below the float chamber 12, and therefore the frame 7,
The fuel tank 1 can be extended and expanded to the limit of the empty space above the generator 4 within the fuel tank 7, making it possible to increase the volume of the fuel tank 1 as a whole.

In the drawing, reference numeral 19 indicates an injection port formed on the upper surface of the upper chamber 1a of the tank 1, 20 indicates the camp, 21 indicates an air cleaner, and 22 indicates a muffler.

In such a configuration, fuel injected from the injection port 19 of the upper chamber 1a enters the upper chamber 1a, overflows from the weir 18 of the communication port 17, and flows into the lower chamber 1b.
After filling the inside, it is stored in the upper chamber 1a. Fuel is supplied to the float chamber 12 of the carburetor 11 through a tube 16 from a supply port 14 formed at the bottom of the upper chamber 1a by gravity dripping.
After the fuel in the upper chamber 1a is used up, the fuel tank 1 is tilted as shown in FIG.
By returning the fuel tank 1 horizontally, the fuel supplied from the lower chamber 1b to the upper chamber 1a is transferred to the weir 1 of the communication port 17, as shown in FIG.
The float chamber 12 of the carburetor 11 is held and stored in the upper chamber 1a at 8, and the float chamber 12 of the carburetor 11 is dripped by gravity from the upper chamber 1a.
supplied to

Although the present invention shows an example in which the fuel tank is fixedly attached to the frame, it may also be rotatably attached using a pivot means, in which case the fuel stored in the lower chamber can be transferred to the upper chamber. When feeding, only the fuel tank can be rotated and tilted without tilting the entire device as shown in FIG. Furthermore, the fuel tank according to the present invention can be used in various engines and their applied equipment.

[Effect of idea]

As explained above, according to the present invention, in a free-fall fuel supply type, the fuel tank can be expanded to a position lower than the carburetor, so the empty space can be used to increase the volume and extend the operating time. It has the effect of making it possible.

Furthermore, since the interior of the fuel tank is separated into an upper chamber and a lower chamber having a smaller capacity than the upper chamber by installing a partition plate horizontally, the capacity of the upper chamber can be increased regardless of the height of the weir. Therefore, it is possible to operate the device for a long time while leaving it stationary.

Furthermore, by setting the height of the circumferential weir erected around the communication port drilled in the horizontally installed partition plate to a predetermined height, the fuel stored in the lower chamber can be transferred by simply tilting the fuel tank once. It is easy to handle as a large amount can be transferred to the upper chamber side.

Furthermore, since the direction of inclination of the fuel tank when transferring fuel from the lower chamber to the upper chamber is not limited, the degree of freedom when assembling the fuel tank into equipment increases.

[Brief explanation of drawings]

1 to 4 show an engine-driven generator equipped with a fuel tank according to an embodiment of the present invention, FIG. 1 is a cutaway front view of the fuel tank, and FIG. 2 is a view of the inside of the upper chamber of the fuel tank. FIG. 3 is a cutaway side view of the main part showing a state in which the fuel is empty; FIG. 3 is a cutaway side view of the main part showing a state in which the fuel tank in the state of FIG. FIG. 4 is a cutaway side view of the main part showing the fuel tank of FIG. 3 in a state where it has been returned to a horizontal position. DESCRIPTION OF SYMBOLS 1... Fuel tank, 1a... Upper chamber, 1b... Lower chamber, 2... Engine drive generator, 11... Carburizer, 12... Float chamber, 13... Partition plate, 1
4...Fuel supply port, 17...Communication port, 18...
Weir.

Claims (1)

[Scope of utility model registration request] A free fall fuel supply type fuel tank,
A partition plate is installed horizontally near the lower limit where fuel can be dripped into the float chamber of the carburetor by gravity to separate the upper chamber and the lower chamber, which has a smaller capacity than the upper chamber. While forming a supply port for supplying fuel to the chamber, a communication port is provided in the partition plate to communicate the upper chamber and the lower chamber, and a circular weir is erected around this communication port toward the upper chamber side. and fuel tank.