JPS63306271A - Fuel feeder - Google Patents

Abstract

PURPOSE:To prevent stoppage of fuel supply due to shifting of fuel by arranging a first filter at the lower section of sub-tank and a second filter above intake port of fuel pump arranged in the sub-tank. CONSTITUTION:A sub-tank 2 is filled with fuel under normal operation. Fuel is sucked by a fuel pump 3 through a first filter F1 and fed through a delivery port 5. Return fuel is led through a return pipe 7 into the sub-tank 2. When fuel is shifted to one side due to cornering, a portion of the first filter F1 separates from the liquid face. The first filter F1 has higher fuel pass resistance than that of the second filter F2, because it is wetted with fuel. Consequently, fuel in the sub-tank passes through the second filter F2 and sucked by the fuel pump 3 through the intake port 4.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a fuel supply device, and in particular, to an improvement of a fuel storage structure, for example, for use in a fuel supply system of an automobile 1. related to things.

[Conventional technology]

As a fuel supply device used in an automobile's fuel supply system, a fuel pump for pumping fuel under pressure is installed inside a fuel tank that stores fuel.The pump sucks up fuel from the bottom of the tank and transfers it to the outside of the tank. There are some that are configured to supply to the demand department.

In such a fuel supply device, when the fuel stored in the tank becomes small and the fuel at the bottom of the tank is pushed to one side due to cornering while driving or parking on a slope, the pump The suction port of the engine is separated from the fuel level and the fuel cannot be pumped, resulting in the engine stopping or being unable to restart.

Therefore, when cornering or parking on a slope,
Conventionally, a sub-tank is installed inside the fuel tank to prevent the fuel pump inlet from leaving the fuel level, and the fuel pump inlet opens into the sub-tank.The sub-tank prevents cornering. A fuel supply device has been proposed that is configured to temporarily delay the deviation of fuel when the vehicle is parked or parked.

[Problem that the invention seeks to solve]

In such a fuel supply system, since the phenomenon of fuel deviation is only temporarily delayed, it is not effective when cornering for a relatively long time or parking or stopping on a slope.

An object of the present invention is to provide a fuel supply device that can reliably prevent fuel supply from being stopped due to fuel deviation.

[Means for solving problems]

The fuel supply device according to the present invention includes a main tank for storing fuel, a sub-tank built into the main tank, a fuel pump having an inlet opened in the sub-tank and pumping fuel out of the main tank, and a sub-tank built into the sub-tank. A return pipe with an open return port, a first filter located at the bottom of the sub-tank, a second filter located above the intake port in the sub-tank, and a second filter located at the top of the sub-tank. A third filter is provided.

[Effect]

During normal operation, when fuel is stored in the main tank at a predetermined level or more, the sub-tank is filled with fuel. In this state, fuel is sucked up from the suction port by the fuel pump through the first filter, and is fed from the discharge port through the outleft pipe.

Since this fuel pump is constantly operated, return fuel is constantly introduced into the sub-tank from its return port through the return pipe.

Here, only a portion of the fuel in the sub-tank passes through the second filter, and most of the fuel overflows into the main tank through the third filter. Therefore, the sub-tank is always filled with fuel, and this filling condition does not change even if the fuel level in the main tank becomes low.

When fuel is drawn to one side of the main tank during cornering or the like, the first filter portion of the sub-tank separates from the liquid level, making it impossible to suck in the fuel in the main tank.

At this time, since the first filter is moistened with fuel, the passage resistance to air is increased by the action of surface tension.
It is higher than the filter's passage resistance to fuel. Therefore, the fuel in the sub-tank passes through the second filter and is sucked up from the intake port by the fuel pump. At this time,
Most of the pressure-fed fuel is returned to the sub-tank by the return pipe, so the fuel in the sub-tank is almost never depleted and is maintained for a long time.

Also, the fuel level and the first filter are separated and the engine is turned off.
(Pump 0FF), the third filter is moistened with fuel and the passage resistance of the third filter to air is high due to surface tension, so air does not flow into the sub-tank. Therefore, the fuel in the sub-tank will not run out and will maintain its initial state.

〔Example〕

FIG. 1 is a partially omitted longitudinal cross-sectional view showing a fuel supply device according to an embodiment of the present invention, and FIGS. 2 and 3 are partially omitted longitudinal cross-sectional views for explaining its operation.

In this embodiment, this fuel supply device includes a main tank (only a part of which is shown) 1 for storing fuel.
The tank 1 is installed at an appropriate location (not shown) in the vehicle body. A sub-tank 2 formed into a hollow body of an appropriate size is fixedly installed on the bottom of the main tank 1, and a sub-tank 2 is installed at the bottom of the sub-tank 2 to pump fuel to an engine (not shown). A fuel pump 3 is permanently installed. The intake port 4 of the fuel pump 3 is opened near the bottom of the sub-tank 2, and the out-left vibro connected to the discharge port 5 of the fuel pump 3 is inserted through the top of the sub-tank 2 and the main tank 1 and connected to the engine. ing. Also,
A return pipe 7 for returning excess fuel pumped under pressure is inserted into the sub-tank 2 through the ceiling wall, and the return port 8 of the return pipe 7 is located above the intake port 4 of the fuel pump 3. It is set up.

The bottom wall of the sub-tank 2 has a large opening, and a first filter F1 is attached to the opening 9 so as to cover the entire opening. There is a partition plate 10 inside the sub tank 2.
is arranged at an intermediate height between the suction port 4 of the fuel pump 3 and the return port 8 of the return pipe 7, and is constructed so as to partition the inside of the sub-tank 2 into an upper and lower part, and a mounting hole opened in this partition plate 10. 11 is the second filter F! is attached to cover the entire opening. In addition, sub tank 2
A small mounting hole 12 is arranged near the ceiling wall in the side wall of the filter, and a third filter F3 is mounted in the mounting hole 12 so as to cover the entire opening.

Each of the filters Fl, Ft, and F3 is manufactured in the form of a net, woven fabric, non-woven fabric, etc. using materials such as full-flexure, resin, fiber, paper, etc., and these filters are made by combining the mesh size and area. As a result, the passage resistance of the second filter F2 to the fuel is lower than that of the first filter F1.
and higher than that of the third filter F3,
Each is configured.

Next, the effect will be explained.

During normal operation when fuel is stored at a predetermined level or higher in the main tank 1, the sub-tank 2 is filled with fuel, as shown in FIG. In this state, fuel is sucked up from the intake port 4 by the fuel pump 3 through the first filter Fl, and is fed to the engine from the discharge port 5 through the outlet vibro. Since this fuel pump 3 is constantly operated, return fuel is always introduced into the upper section of the partition plate 10 in the sub-tank 2 through the return pipe 7 and its return port 8.

Here, since the passage resistance of the second filter F2 to fuel is set higher than that of the first filter F1,
Only a portion of the fuel in sub-tank 2 passes through the second filter F! , and most of it overflows into the main tank l through the third filter F3. therefore,
The sub-tank 2 is always filled with fuel, and this filling state does not change even if the fuel level in the main tank 1 becomes low, as shown in FIG.

When fuel is gathered to one side of the main tank due to cornering, etc., the sub tank 2
Since the portion of the first filter Fz is separated from the liquid level, the fuel in the tank L cannot be sucked.

At this time, since the first filter F is moistened with fuel, the passage resistance to air is increased by the action of surface tension.
This is higher than the passage resistance of the filter F2 for fuel. Therefore, air is not sucked through the filter F1, but the fuel in the sub-tank 2 passes through the second filter F2, is sucked up from the intake port 4 by the fuel pump 3, and is fed to the engine via the out-left vibro. This results in
The engine can continue to operate until the sub-tank 2 runs out of fuel. However, since most of the supplied fuel is returned into the sub-tank 2 through the return pipe 7, the fuel in the sub-tank 2 will hardly run out, and the operation will be maintained for a long time.

Furthermore, even when the car is parked on a slope and the fuel liquid level is separated from the first filter F, the third filter F3 is moistened with fuel, and the air in the third filter F3 is still moistened by the action of surface tension. Since the passage resistance against the sub-tank 2 is high, the air does not flow into the sub-tank 2 and the fuel in the sub-tank 2 remains as it is.

As a result, when the vehicle is restarted after parking on a slope, the fuel in the sub-tank 2 is used to start the engine, which is similar to the effect during cornering.

In this case, i! is connected to the return port 8 of the return pipe 7! Adding a flow stop valve will ensure more effective results.

Note that the present invention is not limited to the above embodiments,
It goes without saying that various changes can be made without departing from the gist of the invention.

For example, the fuel pump is not limited to being installed in the sub-tank, but may be configured so that its suction port opens substantially into the sub-tank using an inleft pipe or the like.

The sub tank is not limited to being configured separately from the main tank.
It may be molded in one piece.

〔Effect of the invention〕

As explained above, according to the present invention, engine failure occurs when the fluid level changes, such as when cornering a vehicle or parking on a slope, without significantly increasing the number of parts compared to conventional fuel supply systems. It is possible to reliably prevent troubles such as malfunctions, and since it has a function to store fuel in the fuel tank in a sub-tank, it is possible to increase the effective utilization rate of fuel, even if the tank has the same capacity. If you do so, you can extend your driving distance.

[Brief explanation of drawings]

FIG. 1 is a partially omitted longitudinal cross-sectional view showing a fuel supply device according to an embodiment of the present invention, and FIGS. 2 and 3 are partially omitted longitudinal cross-sectional views for explaining its operation. Fl...first filter, Fl! ...Second field,
F3...Third filter, 1...Main tank, 2...
...Subtank, 3.Fuel pump, 4.Intake port, 5.Discharge port, 6.Outlet pipe, 7.
...Return pipe, 8...Return port, 9...Opening,
10... Partition plate, 11... Mounting hole, 12... Mounting hole.

Claims (2)

[Claims] (1) A main tank that stores fuel, a sub-tank built into the main tank, an intake port opened in the sub-tank, a fuel pump that pumps fuel out of the main tank, and a return port opened inside the sub-tank. a return pipe located at the bottom of the sub-tank, a first filter located at the bottom of the sub-tank, a second filter located above the fuel pump inlet in the sub-tank, and a second filter located at the top of the sub-tank. A fuel supply device comprising: a third filter. (2) The fuel supply device according to claim 1, wherein the passage resistance of the second filter to the fuel is set to be larger than the passage resistance of the first filter and the third filter to the fuel.