JPH0249965A - fuel supply device - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION (Industrial Application Field) The present invention relates to a fuel supply system, particularly to a fuel supply system for a separate fuel tank often used in four-wheel drive passenger cars and the like.

The pump action is performed using the

Conventionally, in order to reduce fuel injection noise from such a jet pump, the jet pump is placed near the bottom of the main side of the fuel tank, and the fuel is injected into the liquid as much as possible.

(Prior Art) In general, separate fuel tanks often used in four-wheel drive passenger cars, etc. have a recessed central lower surface in order to avoid interference with differential gears or blower shafts and to have a flat shape. Separated into side and sub-side.

In order to prevent fuel from remaining as an invalid amount on the sub side opposite to the main side where the fuel pump is built-in,
A jet pump is used to send fuel from the sub side to the main side.

Conventionally, such a jet pump causes the remaining return fuel out of the fuel supplied from the fuel pump to the fuel injection valve of the engine to flow out as a jet stream from the nozzle, and the negative pressure obtained by the eject effect [Problem to be solved by the invention] However, in such conventional fuel co-feeding devices,
Since the jet pump is disposed near the bottom of the fuel tank, it is necessary to generate a jet flow by overcoming the pressure corresponding to the depth of the fuel remaining in the fuel tank.

Therefore, especially when the tank is full, the corresponding pressure also increases, and the load on the fuel pump, which is the pressure source of the jet flow, increases, resulting in increased electrical wear on brushes, etc., which reduces durability. was there.

SUMMARY OF THE INVENTION An object of the present invention is to provide a fuel supply device that can improve the durability of a fuel pump while reducing fuel injection noise within a fuel tank, in order to solve the conventional problems.

(Means for solving the problem) In order to achieve the above object, the 'f1 form of the tree invention is as follows:
In a fuel supply system that is built into a fuel tank that has a main side and a sub side, and that uses a jet pump that uses the discharge pressure of the fuel pump to send fuel from the sub side to the main side, when the fuel tank is full, the liquid It is characterized in that a sub-tank is disposed near the surface, and the discharge port of the jet pump faces into the sub-tank.

Moreover, the second form of the wood invention is a fuel tank built in a fuel tank having a main side and a sub side, and a jet pump that uses the discharge pressure of the fuel pump to send fuel from the sub side to the main side. The supply device is characterized in that a flexible tube is connected to the discharge port of the jet pump, and the end of the flexible tube is fixed to a float floating on the liquid surface of the fuel tank so as to face the liquid.

[For production]

According to the first aspect of the present invention, the jet jet from the jet pump is discharged from the discharge port facing into the sub-tank disposed near the liquid level of the fuel tank when the tank is full. Therefore, regardless of the amount of fuel remaining in the fuel tank, only the outflow resistance determined by the subtank liquid level can be overcome.
Since the jet stream can be easily flowed out and the fuel pump load does not fluctuate, durability can be improved.

Moreover, since it is injected into the liquid, noise is also reduced.

According to the second aspect of the invention, the jet stream is always guided into the liquid via a flexible tube whose terminal end is fixed to a float floating on the liquid surface of the fuel tank.

Further, since there is no resistance at the discharge port, the load on the fuel pump is reduced and there is no fluctuation, so injection noise is reduced and durability is improved.

[Embodiments] Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings.

FIG. 1 shows an embodiment of the first form of the present invention.

In the figure, 10 is a fuel tank, which is a separate type with a recess in the center of the bottom, main side 10A and sub side 10B.
Consisting of A fuel pump 12 is built into the main side 10A, and this fuel pump 12 sucks fuel F through a strainer 14 and supplies it to the engine through a fuel vibrator 15. The fuel F supplied to the engine E passes through a fuel filter (not shown), its pressure is controlled by a fuel pressure control valve, and is sent to the fuel injection valve, and the remaining fuel is returned to the fuel tank 10 via the return fuel vibrator 18. .

The return fuel vibrator 18 is connected to the nozzle 20A of the shed pump 20.

On the other hand, the other end of the communication vibrator 19, which opens at one end near the bottom of the sub-side JOB, connects to the casing 20 of the jet pump 20.
It is communicated with B.

The discharge port 20C of the shet pump 20 faces into the sub-tank 22 supported by the mounting bracket 21 so as to be located near the liquid level of the fuel tank IO when it is full. A cap 22A is formed on the lower surface of the sub-tank 22, and a hose 24 is attached to the cap 22A. The inner diameter of the mouthpiece 22A is set to have a flow rate that approximately matches the discharge rate of the jet pump 20.

In the embodiment of the first form of the present invention having the above configuration, the fuel pump 12 operates as the engine E operates, and supplies the fuel F to the engine. Then, as described above, the remaining fuel is returned to the return fuel vibe 18 and is injected into the discharge port 2OC from the nozzle 2OA as a jet stream. At this time, due to the eject effect generated around the jet stream, the fuel F on the sub side 10B is sucked up via the communication vibe 19, and flows out from the discharge port 20C along with the jet stream.

Since this fuel F flows out into the liquid stored in the sub-tank 22, the injection noise is reduced.

Furthermore, since the liquid level in the sub-tank 22 is determined by the drain amount from the cap 22A and the outflow amount from the discharge port 20C, by setting the inner diameter of the cap 22A so that the drain amount is slightly smaller, the sub-tank 22 is maintained equal to the top edge.

Therefore, the outflow resistance from the discharge port 20C is kept constant.

The male feed F discharged from the mouthpiece 22A is guided by the port 24, flows down, and is guided to the bottom of the main side 10A.

This prevents the fuel discharged from the nozzle 22A from flying off and causing noise when the fuel level in the fuel tank IO drops.

Next, an example of the second form of the present invention is shown in FIG. The same parts as in the embodiment in the first form are given the same reference numerals to avoid redundant explanation.

That is, in this embodiment, the discharge port 2 of the jet pump 20
Attach the bellows-shaped flexible vinyl tube 25 to 0C,
The end of this tube 25 is connected to the center hole 27A of the float 27.
Press fit into.

According to the above configuration, the fuel F flowing out from the fuel pump 20 is guided to the vinyl tube 25, and is fixed to the float 27 floating on the liquid surface, and the fuel F flows through the vinyl tube Z5 submerged in the liquid. It is discharged from the end 25A during the night.

Even if the liquid level changes, flows 1 to 27 follow it, and the distance between the end 25A of the vinyl tube 25 and the liquid level remains constant without changing.

(Effect of the invention) As is clear from the above explanation, it is clear that
, the outflow resistance can always be kept constant, so it is possible to improve the durability of the fuel pump while reducing the injection noise from the jet pump.

[Brief Description of the Drawings] Fig. 1 is a sectional view showing an embodiment of the first embodiment of the present invention, and Fig. 2 is a partial sectional view showing an embodiment (+1) of the second embodiment of the invention. be. lO... 10A... 10B... 12... 20... 22... 25... 27... Fuel tank, main side, sub side, fuel pump, jet pump, sub tank, possible Deflection/gate, vinyl tube, float.

Claims (1)

[Scope of Claims] 1) In a fuel supply device built in a fuel tank having a main side and a sub side, and configured to send fuel from the sub side to the main side using a jet pump that utilizes the discharge pressure of the fuel pump. A fuel supply device, characterized in that a sub-tank is disposed near the liquid level of the fuel tank when the fuel tank is full, and a discharge port of the jet pump faces into the sub-tank. 2) In a fuel supply device built in a fuel tank having a main side and a sub side, the jet pump uses the discharge pressure of the fuel pump to send fuel from the sub side to the main side. A fuel supply device characterized in that a flexible tube is connected to the outlet, and the end of the flexible tube is fixed to a float floating on the liquid surface of the fuel tank so as to face the liquid.