JPH06207564A - Fuel feeding device - Google Patents

Abstract

PURPOSE:To provide a fuel feeding device capable of automatically prevent /outflow of fuel even when a damage occurs to a piping owing to the fall of a vehicle, and being obtained at a low cost/ CONSTITUTION:A pressure regulator 13 is formed such that a weight 13g is movably arranged in a housing 13a; during normal running, a return pipe 13e is closed under the weight of the weight 13g by means of a diaphragm 13d; and during the fall of a vehicle, the return pipe 13e is opened by means of the diaphragm 13d through movement of the weight 13g. A check valve 14 is located between the pressure regulator 13 and an internal combustion engine 16. When the return pipe 13e is closed, a piping 19 is opened by means of the pressure of a fuel pump 12 and the piping 19 is closed when the return pipe 13e is opened.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a fuel supply device for supplying fuel in a fuel tank to an internal combustion engine, and more particularly to a fuel supply device having a function of returning the fuel to the fuel tank when the vehicle falls. .

[0002]

2. Description of the Related Art Conventionally, as this type, for example, there is one shown in FIG.

According to this, the fuel is the fuel tank 1
Is sucked into the fuel pump 2 and sent under pressure, the fuel damper 3 suppresses the fuel pulsation, and after the dust and water are filtered by the fuel filter 4, the fuel is injected into the fuel injector 5 and the cold start valve 6
And is injected from the fuel injector 5 into each cylinder of the intake manifold 7. Excess fuel is returned to the fuel tank 1 through the pressure regulator 8. At this time, pressure regulator 8
Is from the fuel pump 2 to the pressure regulator 8
Adjust the fuel pressure up to the set pressure.

On the other hand, when the temperature of the cooling water is low, fuel is injected from the cold start valve 6 into the intake manifold 7 only at the time of starting.

Another example of this type is that described in Japanese Utility Model Laid-Open No. Sho 63-192615.

[0006]

However, in such a conventional one, in order to prevent fuel leakage when the vehicle falls and the pipe 9 is damaged, the pipe 9 is usually arranged. Since this is dealt with by adjusting the position or disposing a protector for protecting the pipe 9, there is a problem that the disposing work is troublesome and the cost is high.

Therefore, an object of the present invention is to provide an inexpensive fuel supply system which can automatically prevent the fuel from flowing out even if the vehicle falls and the pipe is damaged.

[0008]

SUMMARY OF THE INVENTION The present invention has been made in view of the above problems, and the fuel in a fuel tank is pressure-fed by a fuel pump and supplied to an internal combustion engine via a pressure regulator and a check valve. In addition, in the fuel supply device that returns excess fuel to the fuel tank through the return pipe of the pressure regulator, the pressure regulator is provided with a weight movably in the housing, and the weight of the weight is normally provided during traveling. The diaphragm closes the return pipe, and when the vehicle falls, the weight is moved so that the diaphragm opens the return pipe.The check valve is arranged between the pressure regulator and the internal combustion engine. Is installed in the The pipe was opened by the pressure of-pumped, it is characterized in that a fuel supply device for closing the pipe when the return pipe opening.

[0009]

[Operation] According to such means, in a normal running state,
The fuel in the fuel tank is sent under pressure by the fuel pump to the pressure regulator and check valve.
In this pressure regulator, the return pipe is closed by the diaphragm due to the weight of the weight,
A predetermined pressure acts on the check valve. This pressure opens the check valve and supplies fuel to the internal combustion engine.

On the other hand, when the vehicle falls, the weight moves and the weight of this weight does not act on the diaphragm, so that the return pipe is opened. As a result, the internal pressure of the pressure regulator does not rise, so the check valve is in the closed state, and the fuel pumped into the pressure regulator by the fuel pump is returned from the return pipe into the fuel tank. From the beginning, that is, no fuel is sent to the internal combustion engine side. Therefore, even if the pipe between the check valve and the internal combustion engine is damaged, a large amount of fuel does not leak from here.

[0011]

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

1 and 2 show an embodiment of the present invention.

First, the structure will be described. Reference numeral 11 is a fuel tank, and the fuel in the fuel tank 11 is
Fuel pump 12, pressure regulator 13,
The pressure is fed to the internal combustion engine 16 via the check valve 14 and the fuel filter 15.

More specifically, in the fuel tank 11, a fuel pump 12 for pumping fuel is disposed on the bottom face 11a side, and a pressure regulator 13 and a check valve 14 for pumping fuel from the pump 12 are provided. Is disposed on the upper surface portion 11b.

Further, the fuel filter 11 is arranged on the internal combustion engine 16 side of the check valve 14, and the filter 11 is connected to the fuel injector 17 and the cold start valve 18 of the internal combustion engine 16.

The pressure regulator 13 is provided with a diaphragm 13d which defines an inside of the housing 13a into an upper chamber 13b and a lower chamber 13c.
On the side, a return pipe 13e for returning the fuel into the fuel tank 11 is arranged along the up-down direction.
The upper opening of the return pipe 13e is opened and closed by the diaphragm 13d. Further, the fuel pump 12 and the check valve 14 are connected to the lower chamber 13c. Further, in the upper chamber 13b, a coil spring 13f having a predetermined spring constant is arranged above the diaphragm 13d, and a weight 13g is arranged above the coil spring 13f.
The weight 13g is arranged so as to be movable in the vertical direction in FIG. 1, and the weight of the weight 13g acts on the diaphragm 13d in a normal traveling state. Further, the upper chamber 13b and the intake manifold 20 of the internal combustion engine 16 are connected. As a result, when the inside of the intake manifold 20 becomes a predetermined negative pressure,
The diaphragm 13d is deformed upward against the weight of the weight 13g to open the return pipe 13e.

Further, the check valve 14 is an opening / closing valve 14 which opens and closes the inlet on the right side in FIG. 1 in the housing 14a.
b is provided, and the opening / closing valve 14b is urged by a predetermined urging force so as to close the inflow port by the spring 14c. The urging force of the spring 14c is set to such a magnitude that the on-off valve 14b is opened when the pressure of the fuel pump 12 acts when the return pipe 13e is closed.

Next, the operation of the fuel supply device having such a structure will be described.

Under normal traveling conditions, the fuel tank 1
The fuel in 1 is pressure-fed by the fuel pump 12 to the pressure regulator 13 and the check valve 14. In this pressure regulator 13, since the return pipe 13e is closed by the diaphragm 13d due to the weight of the weight 13g, a predetermined pressure is applied to the check valve 14.
It acts on the on-off valve 14b. Due to this pressure, the on-off valve 14b of the check valve 14 is moved to the left side in FIG. 1 against the urging force of the spring 14c, and the inlet is opened, so that fuel is pumped to the fuel filter 15,
Here, after the dust and water are filtered, they are supplied to the fuel injector 17 and the cold start valve 18.

Here, when the negative pressure in the intake manifold 20 becomes larger than a predetermined value, the negative pressure in the upper chamber 13b becomes large, so that the diaphragm 13d is deformed upward, the return pipe 13e is opened, and the fuel is discharged. It is returned to the inside of the fuel tank 11 via the return pipe 13e.

On the other hand, as shown in FIG. 2, when the vehicle falls, the weight of the weight 13g does not act on the diaphragm 13d, so that the pressure from the fuel pump 12 deforms the diaphragm 13d as shown in the figure. Thus, the return pipe 13e is opened. As a result, the internal pressure of the pressure regulator 13 does not become high, so the check valve 14 is in the closed state, and the fuel pumped into the pressure regulator 13 by the fuel pump 12 is returned from the return pipe 13e into the fuel tank 11. Therefore, fuel is not sent from the check valve 14 to the internal combustion engine 16 side. Therefore, even if the pipe 19 between the check valve 14 and the internal combustion engine 16 is damaged, a large amount of fuel does not leak from here, and as a result, the pipe 1
The layout of 9 is not particularly difficult, and a protector for covering the pipe 19 is not necessary.

Particularly, in this embodiment, since the pressure regulator 13 and the check valve 14 are provided on the upper surface portion 11b of the fuel tank 11, when the vehicle falls, the pipe 1 protruding from the fuel tank 11 to the outside.
Since the fuel is not pumped to 9, the fuel leakage can be prevented more effectively.

[0023]

As described above, according to the present invention, when the vehicle falls, the weight moves and the weight of the weight does not act on the diaphragm, so that the return pipe is opened. Since the internal pressure of the pressure regulator does not rise, the check valve is in the closed state, and the fuel pumped into the pressure regulator by the fuel pump is returned from the return pipe into the fuel tank. That is, no fuel is sent to the internal combustion engine side. Therefore, even if the pipe between the check valve and the internal combustion engine is damaged, the fuel flow can be automatically stopped by the inexpensive fuel supply device with the simplified structure, which is a practically useful effect. To do.

[Brief description of drawings]

FIG. 1 is an explanatory diagram showing an embodiment of a fuel supply device of the present invention.

FIG. 2 is an explanatory view corresponding to FIG. 1 showing a vehicle falling state according to the same embodiment.

FIG. 3 is an explanatory diagram corresponding to FIG. 1 showing a conventional example.

[Explanation of symbols]

 11 Fuel tank 12 Fuel pump 13 Pressure regulator 13a Housing 13d Diaphragm 13e Return pipe 13g Weight 14 Check valve 16 Internal combustion engine 19 Piping

Claims (1)

[Claims] 1. The fuel in a fuel tank is pressure-fed by a fuel pump to be supplied to an internal combustion engine via a pressure regulator and a check valve, and excess fuel is supplied to the fuel tank via a return pipe of the pressure regulator. In the returning fuel supply device, in the pressure regulator, a weight is movably provided in a housing, and during normal traveling, the return pipe is closed by a diaphragm due to the weight of the weight.
When the vehicle falls, the return pipe is set to open by the diaphragm by the movement of the weight, the check valve is provided between the pressure regulator and the internal combustion engine, and the fuel pump is closed when the return pipe is closed. The fuel supply device is configured so that the pipe is opened by the pressure of 1 and the pipe is closed when the return pipe is opened.