JPH0791341A - Automatic fuel feeder - Google Patents

Abstract

PURPOSE:To facilitate the start of an engine by resetting a fuel level in a carburetor to a normal level at once without cranking the engine long even in the base where the engine has not operated for hours. CONSTITUTION:In an automatic fuel feeder 1 which is connected to an interval between an engine carburetor and a fuel tank, having a valve means 21 in space between its inlet port 3 and a discharge port 4, and this valve means 21 is closed in time of engine stoppage, interrupting a supply of fuel, but this valve means 21 is opened by an inlet vacuum in time of engine revolution, thereby feeding the carburetor with fuel, it is provided with an interconnecting means 26 which interconnects an interval between both these inlet and discharge ports 3 and 4 in linkage with an on-operation of an engine ignition switch or starter switch. This interconnecting means 26 is equipped with a solenoid 27 to be magnetized by the on-operation of the ignition switch or starter switch and an interconnecting valve 29 being opened by the magnetized solenoid 27, and interconnecting an interval between both these inlet and discharge ports 3 and 4, respectively.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an automatic fuel supply system for automatically stopping fuel supply to a carburetor when the engine is stopped.

[0002]

2. Description of the Related Art In small vehicles such as motorcycles, a fuel cock is often connected between an engine carburetor and a fuel tank. This fuel cock is for shutting off the fuel supply to the carburetor when the engine is stopped to prevent the fuel from evaporating inside the carburetor.

However, since such a fuel cock must be manually opened and closed by an occupant every time a motorcycle or the like is used, the operation may be troublesome. Therefore, instead of the fuel cock, an automatic fuel supply device is used that automatically stops the fuel supply to the carburetor when the engine is stopped.

FIG. 6 is a longitudinal sectional view showing an example of a conventional automatic fuel supply device. This automatic fuel supply device 100 is
A suction hole 102, a discharge hole 103, and a negative pressure hole 104 are provided in the casing 101, and a valve means 105 is provided in the passage of the suction hole 102 and the discharge hole 103.
The suction hole 102 is connected to the fuel tank, and the discharge hole 103 is connected to the fuel supply section of the carburetor. Also, the negative pressure hole 1
04 is connected to the negative pressure side of the carburetor.

The valve means 105 comprises a diaphragm 106 and a spring 107. The diaphragm 106 is always urged upward by the spring 107 to close the suction hole 102. Further, a negative pressure chamber 108 is defined below the diaphragm 106, and the negative pressure hole 104 is connected to the negative pressure chamber 108.

When the engine is stopped, the valve means 105 (diaphragm 106) closes the suction hole 102 as shown in FIG. 6, and the fuel supply to the carburetor is stopped to prevent the volatilization of the fuel in the carburetor. To be done.
Then, when the engine is rotated by the power of the kick starter or the starter motor, the negative pressure chamber 10 passes through the negative pressure hole 104.
Since the engine intake negative pressure is applied to 8, the diaphragm 106 is pulled down to open the suction hole 102 as shown in FIG. 7, and the suction hole 102 and the discharge hole 103 communicate with each other to supply the fuel in the fuel tank to the carburetor. To be done.

The provision of such an automatic fuel supply system 100 is very convenient because the occupant does not have to manually open and close the fuel cock every time the motorcycle or the like is used.

[0008]

However, when the automatic fuel supply device 100 is provided, the carburetor is not replenished with fuel even if the fuel in the carburetor is volatilized.
For example, when the motorcycle is not used for a long time, the fuel level in the carburetor is lowered, and the startability of the engine tends to be deteriorated. That is, the engine cannot be rotated sufficiently fast by the power of the kick starter or the starter motor, so the intake negative pressure is weak and the diaphragm 106 does not open well, and it takes a long time for the fuel level in the carburetor to return to the normal level. Cranking (rotating the crankshaft) is required.

The present invention has been made in order to solve the above-mentioned problems. Even when the engine is not operated for a long time, the fuel level in the carburetor is immediately set to the normal level without cranking the engine for a long time. It is an object of the present invention to provide an automatic fuel supply device which can be easily returned to the normal state and can easily start the engine.

[0010]

In order to achieve the above object, an automatic fuel supply apparatus according to the present invention is connected in the middle of a fuel pipe connecting a carburetor of an engine and a fuel tank, and its suction hole and discharge are connected. A valve means is provided between the holes, and when the engine is stopped, the valve means is closed to cut off the fuel supply, and when the engine is rotated, the valve means is opened by negative intake pressure to automatically supply the fuel to the carburetor. In the fuel supply device, there is provided a communication means for communicating between the suction hole and the discharge hole in association with the ON operation of the ignition switch or the starter switch of the engine.

The communication means includes a solenoid excited by the ON operation of the ignition switch or the starter switch, and a communication valve opened by the excited solenoid to connect the suction hole and the discharge hole. Consists of

Further, an energization control means is provided for stopping the energization of the solenoid after a predetermined time has elapsed, or for stopping the energization of the solenoid when the engine is started.

[0013]

According to the automatic fuel supply apparatus having the above-mentioned structure, the fuel in the fuel tank is supplied to the carburetor by interlocking with the ON operation of the ignition switch or the starter switch of the engine so that the intake hole and the discharge hole communicate with each other. That is, when the ignition switch or the starter switch is turned on, the solenoid of the communication means is excited, and this solenoid operates the communication valve to establish communication between the suction hole and the discharge hole.

Therefore, even if the engine is not operated for a long time, the fuel level in the carburetor immediately returns to the normal level without requiring long cranking of the engine, and the engine can be started very easily. Become.

Further, since the energization control means is provided, the energization of the solenoid is stopped after a certain period of time elapses, or the energization of the solenoid is stopped when the engine is started. It can be suppressed to the limit.

[0016]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings.

FIG. 1 is a fuel supply system diagram of a motorcycle or the like to which the automatic fuel supply device according to the present invention is applied.
FIG. 3 is a vertical sectional view of an automatic fuel supply device.

In this automatic fuel supply system 1, a casing 2 is provided with a suction hole 3, a discharge hole 4 and a negative pressure hole 5. The suction hole 3 is connected to a fuel tank 6 and a discharge hole 4 is provided.
Is connected to a fuel supply joint 8 provided on a carburetor 7 of an engine (not shown). The negative pressure hole 5 is connected to a negative pressure joint 9 provided on the negative pressure side of the carburetor 7. The fuel supply joint 8 is a carburetor 7.
It is connected to the float room inside.

As shown in FIG. 2, the casing 2 of the automatic fuel supply system 1 comprises a casing body 11 and a casing cover 14 which is liquid-tightly mounted on the lower surface of the casing body 11 via a packing material 12 and a diaphragm 13. A negative pressure chamber 15 is defined between the diaphragm 13 which is an elastic film and the casing cover 14. The suction hole 3 and the discharge hole 4 are provided on the casing body 11 side, and the negative pressure hole 5 is provided on the casing cover 14 side and is connected to the negative pressure chamber 15.

A vertical hole 16 is provided at the center of the casing body 11.
Pierces in the vertical direction, and the lower end of the vertical hole 16 opens on the diaphragm 13. This opening becomes the first opening 17. Further, the suction hole 3 communicates with the vertical hole 16, and a second opening that opens toward the diaphragm 13 is provided in the middle of the suction hole 3.
The opening 18 is bored. Further, the vertical hole 16 is provided with a third opening 19 that opens toward the ejection hole 4 side. The third opening 19 is formed on the extension shaft of the suction hole 3.

Valve means 21 is provided between the suction hole 3 and the discharge hole 4.
Is provided. The valve means 21 includes the above-mentioned diaphragm 13, a valve body 22 attached to a central portion of the diaphragm 13, a valve seat 23 provided in the first opening portion 17,
Spring 2 for urging the valve body 22 toward the valve seat 23
4, the valve body 22 is always brought into close contact with the valve seat 23 by the urging force of the spring 24, and the first opening 1
7 is closed. When the valve body 22 closes the first opening 17, the second opening 18 is closed at the same time. A stopper 25 for restricting the movement of the valve body 22 is provided in the negative pressure chamber 15.

Now, in the automatic fuel supply device 1, the ignition switch of the engine or the O of the starter switch is turned on.
A communication means 26 is provided for communicating between the suction hole 3 and the discharge hole 4 in association with the N operation. This communication means 26
Is configured as follows, for example.

A solenoid housing 27 is fixed to the upper part of the casing main body 11, and a solenoid 28 is provided inside the solenoid housing 27.
Is provided. On the other hand, a cylindrical communication valve 29 made of a magnetic material such as iron is slidably inserted into the vertical hole 16. The upper portion of the communication valve 29 projects into the solenoid housing 27 and can be inserted into the solenoid 28. Then, the communication valve 29 is constantly urged downward by the spring 32 elastically mounted between the flange 31 provided in the intermediate portion of the communication valve 29 and the solenoid housing 27.

Communication valve 2 biased by the spring 32
The lower end of 9 closes the suction hole 3 to the vertical hole 16, and at the same time closes the third opening 19. When the solenoid 28 is excited, as shown in FIG.
The communication valve 29, which is a magnetic body, is pulled up by the magnetic force of 1., the suction hole 3 communicates with the vertical hole 16, and the third opening 19 opens.

As shown in FIG. 1, the solenoid 28 is connected to an ignition switch or starter switch 33 of a motorcycle or the like and an in-vehicle battery 34. The ignition switch or starter switch 33 is ON.
Then, the current of the vehicle-mounted battery 34 is supplied to the solenoid 28 to excite the solenoid 28. Further, in the middle of this circuit, there is connected an energization control means 35 for stopping energization of the solenoid 28 after a lapse of a certain time or stopping energization of the solenoid 28 when the engine is started.

The automatic fuel supply system 1 configured as described above
Works as follows.

When the ignition switch or starter switch 33 is OFF and the engine is stopped, the valve body 22 is brought into close contact with the valve seat 23 by the urging force of the spring 24, and the valve means 21 is closed, as shown in FIG. Since the valve is opened, the first opening 17 and the second opening 18 are closed. At this time, since the solenoid 28 of the communication means 26 is not excited, the communication valve 29 is pushed down by the spring 32, and the suction hole 3 is closed with respect to the vertical hole 16. Therefore, the fuel supply to the carburetor 7 is stopped and the volatilization of the fuel in the carburetor 7 is prevented.

When the ignition switch or starter switch 33 is turned on, the vehicle battery 3
The current of 4 is supplied to the solenoid 28 to
Is excited, and the communication valve 29 is pulled up against the biasing force of the spring 32 as shown in FIG. Therefore, the suction hole 3 communicates with the vertical hole 16 and the third opening 19 is opened, and the suction hole 3 and the discharge hole 4 communicate with each other so that the fuel in the fuel tank 6 is quickly supplied to the carburetor 7. It Therefore, even if the engine is not operated for a long time, the fuel level in the carburetor 7 immediately returns to the normal level without cranking the engine for a long time, and the engine can be started very easily.

Further, when the engine is rotated by the power of the starter motor, negative suction pressure of the engine is applied to the negative pressure chamber 15 through the negative pressure hole 5, and the diaphragm 13 is pulled down to open the valve means 21 as shown in FIG. Speak. Therefore, the first opening 17 and the second opening 18 are opened, and the fuel from the suction hole 3 receives the first to third openings 17, 18, 19.
Through the discharge hole 4.

When the energization time to the solenoid 28 has passed a certain time, or when the engine is started, the energization control means 35 works to actuate the solenoid 28.
Energization is stopped, and the excitation of the solenoid 28 is released. Therefore, as shown in FIG. 5, the communication valve 29 is pushed down by the spring 32, and the suction hole 3 is closed with respect to the vertical hole 16. Even if the engine has not started at this point,
Since the fuel liquid level in the carburetor 7 has returned to the normal level, it is not necessary to raise the communication valve 29.

When the engine is started, the intake negative pressure applied to the negative pressure chamber 15 becomes strong, so that the valve means 21 is fully opened and the fuel from the suction hole 3 passes through the second opening 18 and the discharge hole 4 is discharged. Flowing to the side. Since the valve body 22 of the valve means 21 contacts the stopper 25 and does not open more than a certain amount, damage to the diaphragm 13 is prevented.

Since the energization control means 35 is provided, the energization time to the solenoid 28 is limited to a short time, so that the discharge amount of the on-vehicle battery 34 can be minimized.

[0033]

As described above, the automatic fuel supply apparatus according to the present invention is connected in the middle of the fuel pipe connecting the carburetor of the engine and the fuel tank, and the valve is provided between the intake hole and the discharge hole. In an automatic fuel supply device that has a body, shuts off the supply of fuel by closing the valve body when the engine is stopped, and opens the valve body by intake negative pressure when the engine is rotating to supply fuel to the carburetor, A communication means is provided for communicating between the suction hole and the discharge hole in association with an ON operation of an engine ignition switch or a starter switch, and the communication means is excited by an ON operation of the ignition switch or the starter switch. A solenoid valve and a communication valve that is opened by the excited solenoid to connect the suction hole and the discharge hole. Those were.

Therefore, even if the engine is not operated for a long time, the fuel level in the carburetor can be immediately returned to the normal level without cranking the engine for a long time, and the engine can be started very easily. can do.

Further, since the energization control means for stopping the energization of the solenoid after a lapse of a predetermined time or stopping the energization of the solenoid upon engine start is provided, the discharge amount of the battery for exciting the solenoid is minimized. You can

[Brief description of drawings]

FIG. 1 is a fuel supply system diagram to which an automatic fuel supply device according to the present invention is applied.

FIG. 2 is a vertical cross-sectional view of an automatic fuel supply device showing an embodiment of the present invention.

FIG. 3 is a vertical sectional view of the automatic fuel supply device showing a state where a solenoid is excited.

FIG. 4 is a vertical cross-sectional view of the automatic fuel supply device showing a state when the engine rotates.

FIG. 5 is a vertical cross-sectional view of the automatic fuel supply device showing a state where the solenoid is deenergized.

FIG. 6 is a vertical cross-sectional view of an automatic fuel supply device showing a conventional technique.

FIG. 7 is a vertical cross-sectional view of a conventional automatic fuel supply device showing a state when the engine rotates.

[Explanation of symbols]

 1 Automatic Fuel Supply Device 3 Suction Hole 4 Discharge Hole 5 Negative Pressure Hole 6 Fuel Tank 7 Carburetor 13 Diaphragm 21 Comprising Valve Means 21 Valve Means 22 Valve Body Comprising Valve Means 23 Valve Seat Comprising Valve Means 24 Valve Means Constituting spring 26 Communication means 28 Solenoid forming communication means 29 Communication valve forming communication means 32 Spring forming communication means 33 Ignition switch or starter switch 34 In-vehicle battery 35 Energization control means

Claims (3)

[Claims] 1. A valve means is connected between an engine carburetor and a fuel tank, and has a valve means between its suction hole and discharge hole. When the engine is stopped, the valve means is closed to cut off the supply of fuel. In an automatic fuel supply device that supplies fuel to a carburetor by opening the valve means by negative pressure of intake air when the engine is rotating, the intake hole and the discharge hole are linked with ON operation of an ignition switch or a starter switch of the engine. An automatic fuel supply device, characterized in that a communication means is provided for communicating between the two. 2. The communication means includes a solenoid excited by the ON operation of the ignition switch or the starter switch, and a communication valve opened by the excited solenoid to communicate between the suction hole and the discharge hole. The automatic fuel supply device according to claim 1, wherein the automatic fuel supply device is provided with. 3. The automatic fuel supply according to claim 2, further comprising energization control means for stopping energization of the solenoid after a lapse of a certain time or stopping energization of the solenoid when the engine is started. apparatus.