JPH0539751A - Engine fuel switching device - Google Patents

Abstract

(57) [Abstract] [Purpose] To provide an engine fuel switching device capable of achieving proper selective use of kerosene and gasoline with a simple structure. [Structure] A branch pipe 16 that branches and connects to a gasoline supply mechanism and a kerosene supply mechanism is provided in front of the float chamber of the carburetor, and a switching valve 15 is connected to the branch pipe 16 and a throttle provided upstream of the float chamber. Provided. When the throttle valve is fully opened, the float chamber and the kerosene supply mechanism are in communication with each other, so that the float chamber and the gasoline supply mechanism can be in non-communication state. The engine characteristics can be easily obtained. In order to switch between gasoline and kerosene, the float chamber can be reduced by using one float chamber common to the gasoline system and the kerosene system, so that the float chamber can be reduced and the structure can be simplified accordingly.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an engine fuel switching device for selectively switching kerosene and gasoline as fuel.

[0002]

2. Description of the Related Art An example of a conventional engine fuel switching device is shown in FIGS. In the figure, a kerosene supply passage 3 is connected to a main float chamber 2 of a carburetor 1, and a gasoline supply mechanism 5 having a gasoline side float chamber 4 is connected to the main float chamber 2. The gasoline supply mechanism 5 is provided with a bypass passage (not shown) provided for idle operation and the like, and a gasoline supply passage 6. When the engine is started, the gasoline supply passage 6
Is opened to supply the gasoline to the engine side, while the gasoline supply passage 6 is closed and the kerosene supply passage 3 is opened when the vehicle is fully opened to rotate the engine mainly using kerosene as fuel.

As an engine using gasoline as fuel, for example, there are those shown in FIG. 5 to FIG. 8. A carburetor 1 is provided on the fuel supply side of this engine E, and a gasoline (not shown) is provided in the preceding stage. A supply mechanism is provided.

[0004]

3 and 4, the kerosene supply passage 3 is opened to rotate the engine using kerosene as fuel, but the bypass passage of the gasoline supply mechanism 5 is alive. However, although a small amount of gasoline is supplied to the engine side, desired output characteristics may not be obtained. Therefore, in practice, the gasoline supply mechanism 5 including the bypass passage is often cut and used. In this case, the main float chamber 2 becomes empty, which may cause the float and the valve seat to be worn.

Further, as described above, when the gasoline supply mechanism 5 is cut during the full-open running to perform the operation, when the engine is lowered and the gasoline supply passage 6 is opened, the acceleration is performed. Although the fuel may not be sufficiently supplied to the main float chamber 2 and the engine may stop, in this case, the acceleration pump 7 is provided so that the fuel is sufficiently supplied even at the time of sudden acceleration. But,
It is the actual situation that the apparatus becomes large in size due to the additional provision of the acceleration pump 7, and the apparatus becomes complicated accordingly.

Another example of a device for switching between two types of fuel and supplying it to the engine side is disclosed in Japanese Utility Model Laid-Open No. 61-169258, which uses a gasoline supply mechanism and an alcohol. Since the float chamber is separately provided corresponding to each of the supply mechanisms, there is a problem that the entire apparatus is complicated like the above-mentioned one.

The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a fuel switching device for an engine capable of achieving proper selective use of kerosene and gasoline with a simple structure.

[0008]

In order to achieve the above object, the present invention provides a branch pipe, which is branched and connected to a gasoline supply mechanism and a kerosene supply mechanism, in front of a float chamber of a carburetor. A switching valve that switches between the gasoline supply mechanism and the kerosene supply mechanism and communicates with the float chamber.
It is characterized in that it is provided so as to interlock with a throttle mechanism provided upstream of the float chamber.

[0009]

With this structure, when the throttle valve is fully opened, the float chamber and the kerosene supply mechanism are in communication with each other, and the float chamber and the gasoline supply mechanism can be in non-communication state. Kerosene is no longer mixed with gasoline. Also, in order to switch between gasoline and kerosene, one float chamber common to the gasoline supply mechanism and the kerosene supply mechanism has been achieved, and a float chamber is provided for each of the gasoline supply mechanism and the kerosene supply mechanism. Compared to, it requires less float room.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An engine fuel switching device according to an embodiment of the present invention will be described below with reference to FIGS. In the figure, 8 is a substantially cylindrical fuel intake boss whose one end side is connected to the float chamber (not shown) side of the carburetor, and the cylindrical gasoline elbow 9 and kerosene elbow 10 are respectively provided on the side portions thereof. The fuel intake bosses are branched and connected to face each other. A gasoline supply mechanism (not shown) is connected to the gasoline elbow 9, and a kerosene supply mechanism (not shown) is connected to the kerosene elbow 10.

In the opening 11 on the other end side of the fuel intake boss 8,
A valve body 14 having a structure in which a shaft 13 is provided on a valve body 12 having a substantially truncated cone shape.
However, the valve body 12 is positioned in close contact with the inner wall 8a of the branch portion of the fuel intake boss 8 and the shaft 13 is rotatably inserted so as to project to the outside. The valve body 12 has a passage 12a, one of which opens to the top flat surface portion and the other of which opens to the side surface portion.
When the valve body 14 is rotated, the side surface opening 12b can communicate with the passage 9a of the gasoline elbow 9 and the passage 10a of the kerosene elbow 10. In this embodiment, the inner wall 8a of the branched portion of the fuel intake boss 8 serves as a valve seat, and the inner wall 8a of the branched portion of the fuel intake boss 8 and the valve body 14 constitute a switching valve 15. Further, in this embodiment, the fuel intake boss 8, the tubular gasoline elbow 9 and the kerosene elbow 10 form a branch pipe 16.

The fuel intake boss 8 is provided with a bottomed cylindrical cap 17 that covers the opening 11 on the other end side of the fuel intake boss 8 with the tip of the shaft protruding from a hole formed in the center of the bottom. Has been. Between the bottom of the cap 17 and the valve body 12,
A compression spring 18 is interposed and presses the valve element 14 toward the fuel intake boss 8 side to bring the valve element 14 into close contact with the fuel intake boss 8. A seal member 19 such as an O-ring is interposed between the inner wall of the opening 11 on the other end side of the fuel intake boss 8 and the valve body 12 so as to perform a sealing function.

A driven gear 22 is attached to the tip of the shaft 13 by a washer 20 and a nut 21. A drive gear 24 attached to the throttle shaft 23 is screwed into the driven gear 22, and the valve body 14 is rotated according to opening and closing of the throttle valve so that the switching valve 15 is operated. There is. In this case, at the time of engine starting or trolling, the opening 12b on the side surface of the valve body 12 faces the gasoline elbow 9 as shown in FIG. 1, while the opening 12b is fully open when the kerosene elbow 10 is opened.
It is designed to face.

In the engine fuel switching device configured as described above, the opening 12b of the side surface of the valve body 12 is directed toward the gasoline elbow 9 when the engine is started or trolling. Therefore, the passage 9a of the gasoline elbow 9 is fully opened to supply gasoline to the engine side through this passage 8a, while the kerosene elbow 10 is closed in this state, the kerosene is blocked by the switching valve 15. It is not supplied to the engine side.

When the throttle valve is gradually opened, the drive gear 24 and the driven gear 22 are actuated accordingly, and the valve element 14 is rotated to close the passage 9a of the gasoline elbow 9 and the passage of the kerosene elbow 10. You will start opening 10a.

When the throttle valve is opened over a predetermined opening, the passage 9a of the gasoline elbow 9 is fully closed,
The passage 10a of the kerosene elbow 10 is fully opened, and only kerosene is supplied to the engine side while the gasoline supply is stopped. Therefore, when the throttle valve is fully opened, the kerosene is not mixed with gasoline, and desired engine characteristics can be easily obtained.

When the throttle valve is gradually reduced and the engine is stopped after the vehicle is fully opened, the float chamber is filled with gasoline. Therefore, at this stage, even if an attempt is made to accelerate, the engine can be restarted easily.

In the conventional engine fuel switching device, the float chamber was provided separately for the gasoline system and the kerosene system.
On the other hand, in the engine fuel switching apparatus of the present invention, since the gasoline chamber and the kerosene are switched, only one float chamber common to the gasoline system and the kerosene system is required. The structure can be simplified as much as you do. Therefore, the durability performance of the entire device can be improved, and the cost of the entire device can be reduced. In addition, the device is made compact due to the simplified structure, which enables the device to be installed even if the installation space is small.

[0019]

According to the engine fuel switching device of the present invention, when the throttle valve is fully opened, the float chamber and the kerosene supply mechanism are in communication with each other, and the float chamber and the gasoline supply mechanism are not in communication with each other. As a result, kerosene is prevented from being mixed with gasoline at the time of full-open running, so that desired engine characteristics can be easily obtained.

Further, in order to switch between gasoline and kerosene, it is possible to reduce the number of float chambers by using one float chamber which is common to gasoline system and kerosene system, and the structure can be simplified accordingly. Furthermore, the durability of the entire apparatus can be improved with the simplification of the structure, and the installation space can be reduced by reducing the cost and compacting the entire apparatus.

[Brief description of drawings]

FIG. 1 is a cross-sectional view of essential parts showing a fuel switching device for an engine according to an embodiment of the present invention.

FIG. 2 is a partial cross-sectional view taken along arrow A in FIG.

FIG. 3 is an exploded perspective view showing an example of a conventional engine fuel switching device.

FIG. 4 is a cross-sectional view showing the main float chamber and the gasoline side float chamber of FIG.

FIG. 5 is an exploded perspective view showing a conventional carburetor for a gasoline engine.

FIG. 6 is a front view showing the gasoline engine.

FIG. 7 is a view on arrow P of FIG.

8 is a sectional view taken along the line BB of FIG.

[Explanation of symbols]

 8 Fuel intake boss 9 Gasoline elbow 10 Kerosene elbow 12 Valve body 13 Shaft 14 Valve body 15 Switching valve 16 Branch pipe

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[Procedure amendment]

[Submission date] December 3, 1991

[Procedure Amendment 1]

[Document name to be amended] Statement

[Name of item to be corrected] 0002

[Correction method] Change

[Correction content]

[0002]

2. Description of the Related Art An example of a conventional kerosene engine is shown in FIGS. In the figure, a kerosene supply passage 3 is connected to a main float chamber 2 of a carburetor 1, and a gasoline supply mechanism 5 having a gasoline side float chamber 4 is connected to the main float chamber 2. Gasoline supply mechanism 5
Is provided with a bypass passage (not shown) provided for idle operation and the like, and a gasoline supply passage 6. In the figure, 4a is a knee provided in the gasoline-side float chamber 4.
It is a dollar valve that opens and closes when the float moves up and down
It is designed to be kept constant. In addition, in main float room 2
Also has the same function as the needle valve 4a.
A valve (not shown) is provided to keep the oil level constant.
I have to. And with this kerosene engine,
While using mainly gasoline when idling,
At the time of full sailing, mainly use kerosene to rotate
is doing.

[Procedure Amendment 2]

[Document name to be amended] Statement

[Name of item to be corrected] 0003

[Correction method] Change

[Correction content]

It should be noted that the key of an engine that uses gasoline as fuel is
As the carburetor , for example, those shown in FIGS. 5 to 8 are provided, and a gasoline supply mechanism (not shown) is provided in the preceding stage of the carburetor 1 .

[Procedure 3]

[Document name to be amended] Statement

[Correction target item name] 0004

[Correction method] Change

[Correction content]

[0004]

By the way, the kerosene engine shown in FIGS. 3 and 4 is fully opened even when idling.
At times, there is a small amount of expensive gasoline compared to kerosene
Is always supplied to the engine side, which is uneconomical.
It was Therefore, in practice, the gasoline supply mechanism 5 is often cut and used. In this case, the main float chamber 2 becomes empty, which may cause the float and the valve seat to be worn.

[Procedure amendment 4]

[Document name to be amended] Statement

[Correction target item name] 0016

[Correction method] Change

[Correction content]

When the throttle valve is opened more than a predetermined opening, the passage 9a of the gasoline elbow 9 is fully closed, while the passage 10a of the kerosene elbow 10 is fully opened.
Only kerosene will be supplied to the engine side with the supply of gasoline stopped. Therefore , gasoline is supplied when the throttle valve is fully opened.
It becomes economical with the disappearance.

[Procedure Amendment 5]

[Document name to be amended] Statement

[Correction target item name] 0017

[Correction method] Change

[Correction content]

[0017] After fully open cruising, gradually when the engine is stopped squeezing the throttle valve, the float chamber is in a state filled with gasoline. Therefore, if an attempt is made to start the engine at this stage, it can be easily restarted.

[Procedure Amendment 6]

[Document name to be amended] Statement

[Name of item to be corrected] 0019

[Correction method] Change

[Correction content]

[0019]

According to the engine fuel switching device of the present invention, when the throttle valve is fully opened, the float chamber and the kerosene supply mechanism are in communication with each other, and the float chamber and the gasoline supply mechanism are not in communication with each other. Due to full sailing
Because gasoline will not be supplied,
You can get better.

[Procedure Amendment 7]

[Document name to be amended] Statement

[Name of item to be corrected] Figure 3

[Correction method] Change

[Correction content]

FIG. 3 is an exploded perspective view showing an example of a conventional kerosene engine .

[Procedure Amendment 8]

[Document name to be amended] Statement

[Name of item to be corrected] Figure 6

[Correction method] Change

[Correction content]

FIG. 6 is a front view showing the carburetor .

[Procedure Amendment 9]

[Document name to be corrected] Drawing

[Name of item to be corrected] Fig. 4

[Correction method] Change

[Correction content]

[Figure 4]

[Procedure Amendment 10]

[Document name to be corrected] Drawing

[Name of item to be corrected] Figure 6

[Correction method] Change

[Correction content]

[Figure 6]

[Procedure Amendment 11]

[Document name to be corrected] Drawing

[Name of item to be corrected] Figure 7

[Correction method] Change

[Correction content]

[Figure 7]

[Procedure Amendment 12]

[Document name to be corrected] Drawing

[Correction target item name] Figure 8

[Correction method] Change

[Correction content]

[Figure 8]

Claims (1)

[Claims] 1. A carburetor is provided with a branch pipe at a front stage of a float chamber for branching and connecting to a gasoline supply mechanism and a kerosene supply mechanism, and the gasoline supply mechanism and the kerosene supply mechanism are switched to the branch pipe to communicate with the float chamber. Switch valve,
A fuel switching device for an engine, which is provided so as to interlock with a throttle mechanism provided upstream of the float chamber.