JP2000052791A - Fuel feed module - Google Patents

Abstract

PROBLEM TO BE SOLVED: To surely supply fuel to an internal combustion engine without influence of non-flatness of the bottom of a fuel tank by forming a chamber for storing a fuel coarse filter between the bottom of a pot and a base plate. SOLUTION: The side of a storing pot 2 provided with a fuel coarse filter 4 that faces to the bottom of a fuel tank 6 is covered with a base plate 12. The base plate 12 is fixee at a pin 5 to the storing pot 2 by quick-lock coupling or the like, and the base plate 12 is arranged in parallel to the pot bottom 9 at a space for storing the fuel coarse filter 4 between the base plate 12 and the pot bottom 9. An intermediate chamber for storing the fuel coarse filter 4 between the base plate 12 and the pot bottom 9 forms a chamber 10. The chamber 10 is formed as an annular chamber, and opened toward the fuel tank 6 like a partial periphery in an area of the bottom of the fuel tank 6.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a fuel feed module, comprising a fuel pump for pumping fuel from a fuel tank having a bottom to an internal combustion engine, a suction jet pump, and a fuel pump. A fuel coarse filter, wherein the fuel pump is located in a storage pot with a pot bottom.

[0002]

2. Description of the Related Art A fuel feed module of this type is known, for example, from DE-A-196 15.
No. 081. In automobiles, a fuel pump installed in a fuel feed module inside a fuel tank is used. The fuel feed module, which is located mainly at the bottom of the fuel tank, is provided with a fuel supply to ensure that even when the fuel tank is partially empty, especially when traveling on curves and / or on slopes. The feed module fuel pump is assembled to the storage pot. The storage pot maintains a predetermined level of fuel directly around the fuel pump. This is because the storage pot as part of the fuel feed module also acts as a reservoir. The storage pot is filled from the bottom of the fuel tank by, for example, a suction jet pump that can be installed in the area of the pot bottom. The suction action of the suction jet pump is created by the negative pressure created behind the nozzle. As working fluid, return fuel not used by the internal combustion engine is used. However, the returned fuel may be directly pumped into the storage pot.

[0003] Fuel normally flows through two different fuel filters in the path to the internal combustion engine. The first filter is usually a coarse filter and is located on the suction side in a fuel pump incorporated in the storage pot. The second filter is typically a fine filter, located after the fuel pump and located in the fuel feed module or outside the fuel tank.

Further, German Patent Application Publication No. 1
No. 9619992 describes a fuel feed module with an integrated fuel microfilter. This known fuel feed module is mounted directly on the bottom of the fuel tank at the bottom of the storage pot. In this case, the coarse filter is arranged inside the storage pot in the suction area of the fuel pump. A disadvantage is that an additional connecting member with a locking notch is required for fixing the storage pot to the bottom of the fuel tank. In this case, the connecting member may be integrated into a separate closing plate, so that such a closing plate with a bottom sealing member forms an assemblable bottom for the storage pot.

[0005] Published German Patent Application No. 1961
A further disadvantage of the fuel feed module according to 5081 is that the unevenness (unevenness) at the bottom of the fuel tank is
This has a disadvantageous effect on the suction jet pump arranged in the region of the pot bottom and thus on the operation of the internal combustion engine when the fuel feed module is not immersed in fuel. This occurs in particular on inclined planes when the tank is underfilled.

In particular, the bottom surface of a fuel tank made of plastic has an unevenness of up to 3 mm. A gap is formed between the fuel feed module and the bottom of the fuel tank according to the unevenness of the bottom of the fuel tank. If the fuel feed module is not immersed in the fuel, the fuel flows as a free jet into the mixing tube through the nozzle of the suction jet pump. Therefore, no conditions for the spread of the jet in the region of the mixing tube are given. Therefore, unsealing occurs. This is because around the free jet, fuel flows from the storage pot through the mixing tube. Thus, fuel flows out of the storage pot through gaps that may occur between the fuel feed module and the bottom of the fuel tank. In some cases, when the storage pot is idling, reliable engine operation is no longer performed. The function of the coarse filter installed on the suction side may be impaired by the unevenness of the tank bottom.

[0007]

SUMMARY OF THE INVENTION The object of the present invention is not to be influenced by the unevenness of the bottom of the fuel tank, even when the fuel tank is almost empty, or when traveling on a curve and / or on a slope. Good filling characteristics, even when insured, ensure a reliable supply of fuel to the internal combustion engine and do not require additional fixing members to fix the fuel feed module to the bottom of the fuel tank. To provide a fuel feed module having the same.

[0008]

In order to solve this problem, according to the structure of the present invention, a bottom plate is attached to the bottom of the pot at an interval, and the bottom plate is substantially placed on the bottom of the fuel tank. A chamber for receiving the fuel coarse filter is formed between the bottom of the pot and the bottom plate.

According to the present invention, a fuel feed module has a fuel pump for pumping fuel from a fuel tank having a bottom to an internal combustion engine, and a fuel coarse filter preceding the fuel pump. ing. The fuel pump is located in a storage pot having a pot bottom. According to the invention, a bottom plate is arranged at a distance from the bottom of the pot, the bottom plate resting substantially on the bottom of the fuel tank. A chamber is formed between the pot bottom and the bottom plate, and the fuel coarse filter is disposed in the chamber. The suction jet pump is in this case arranged such that a negative pressure is built up in this chamber during operation, so that fuel is drawn from the fuel tank through this coarse filter without the possibility of passing by the fuel coarse filter. It is. And / or return fuel not required by the internal combustion engine is pumped back into the storage pot, in which case there is no risk of backflow from the storage pot to the fuel tank.

According to an embodiment, the fuel coarse filter is advantageously mounted in the bottom of the pot and is therefore covered by a bottom plate in the direction of the bottom of the fuel tank. This bottom plate, which is therefore simply made flat because of its relatively small size, forms an additional bottom closure for the storage pot. The storage pot guarantees a reliable function of the coarse filter of the fuel feed module at all times without being affected by the unevenness of the bottom surface of the fuel tank.

[0011] The bottom plate is preferably arranged substantially parallel to the pot bottom and has a size or diameter approximately corresponding to the size or diameter of the storage pot.

According to another configuration of the present invention, the pot bottom of the storage pot of the fuel feed module has at least one pot.
Advantageously has one pin in the middle of the bottom of the pot,
At this pin the bottom plate is fixed. The bottom plate is preferably fixed at the pins by a quick-lock connection. Such a quick lock connection allows the bottom plate to be pressed against the pins,
Alternatively, it is somewhat embedded in this pin, which ensures that the bottom plate is fixed to the pot bottom of the storage pot with the coarse fuel filter.

[0013] Since the bottom plate is arranged substantially parallel to the pot bottom, a substantially plate-shaped chamber is formed between the bottom plate and the pot bottom, and this chamber is formed at least partially around the circumference. Because it is open, the fuel flows substantially radially into the chamber and thus completely through the fuel coarse filter. Since a sealing wall is formed in the area of the storage pot and the area is closed by the sealing wall, there is no risk of fuel flowing into the room from outside, that is, from inside the fuel tank. This can create a negative pressure in the storage pot chamber that acts to draw fuel. As a result, the fuel is completely drawn from the fuel tank through the fuel coarse filter. Alternatively, the fuel returned from the internal combustion engine is directly supplied again from the chamber to the storage pot, in which case the returned fuel does not exit the storage pot and flow back to the fuel tank, and is thus stored as a reservoir. There is no danger of offsetting the pot function.

[0014]

The advantage of the fuel feed module according to the invention lies, inter alia, in a good fuel supply even in the case where the fuel feed module is not immersed in the fuel tank. In this case, unevenness (unevenness) at the bottom of the fuel tank is compensated for by the bottom plate or is no longer a problem. This means that the bottom plate on the one hand compensates for the flatness of the tank bottom, which ensures that the fuel coarse filter flows through under all conditions, in this case formed by the flatness of the bottom of the fuel tank The gap means that there is no danger of fuel passing by the fuel coarse filter. Furthermore, in the chamber formed between the bottom plate and the pot bottom, a negative pressure is generated due to the reliable operation of the suction jet pump. This prevents the fuel returned from the internal combustion engine from flowing back into the fuel tank indoors. Further, such returned fuel is simultaneously sucked again and pumped to the storage pot. This guarantees the best fueling of the internal combustion engine under different conditions of use of the motor vehicle, especially in vehicles with substantially empty fuel tanks and / or on slopes.

[0015]

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a block diagram of an embodiment of the present invention.

FIG. 1 is a sectional view of the fuel feed module 1. The fuel feed module 1 has a storage pot 2 having a pot wall 7 and a pot bottom 9. In this case, the storage pot 2 is formed as a cylindrical component. The storage pot 2 can be manufactured, for example, from fuel-resistant plastic or metal.
The crude fuel filter 4 is attached to the pot bottom 9. A pin 5 is provided in the middle of the pot bottom 9, and the fuel coarse filter 4 is fixed at the pin 5. Further, the fuel coarse filter 4 may be directly incorporated into the outer surface of the pot bottom 9 and cast.

The side of the storage pot 2 provided with the fuel coarse filter 4 facing the bottom of the fuel tank 6 is a bottom plate 1.
2 is covered. The bottom plate 12 is fixed to the storage pot 2 at the pin 5 by, for example, a quick lock connection. This bottom plate 12
Can be formed from aluminum, steel, or plastic. The bottom plate 12 is parallel to the pot bottom 9 and is spaced between the bottom plate 12 and the pot bottom 9 such that the coarse fuel filter 4 is accommodated therein. This intermediate chamber containing the fuel coarse filter 4 between the bottom plate 12 and the pot bottom 9 forms a chamber 10. The chamber 10 is formed as an annular chamber and is partially open to the fuel tank 6 in the region of the bottom of the fuel tank 6. In the region of the fuel feed module in which the suction jet pump 8 is arranged, the chamber 10 is closed in the direction of the fuel tank 6 by a partially circumferential ring web forming a sealing wall 11. As a result, the suction jet pump 8 moves the chamber 1
A negative pressure can be created within zero. Due to this negative pressure,
Fuel flows from the fuel tank 6 through the fuel coarse filter 4 to the chamber 1.
It is ensured that return-directed fuel which has not been sucked into or consumed by the internal combustion engine is pumped directly from the chamber 10 into the interior of the storage pot 2 and this returned fuel is discharged from the chamber 10 There is no danger of backflow into the fuel tank 6. By arranging the bottom plate 12, i.e. the whole sucked fuel flows only through the fuel coarse filter and therefore avoids flowing past the fuel coarse filter due to the fact that the bottom of the fuel tank 6 is not flat. Is guaranteed. This is because even if there is a gap between the bottom plate 12 and the actual bottom surface of the fuel tank 6, it is small for the fuel flow flowing through the fuel filter 4 to the chamber 10.

FIG. 2 is an enlarged sectional view of the region of the pot bottom 9 having the pin 5. Since the bottom plate 12 is fixed to the pin 5 in the same plane, the pot bottom 9
A chamber 10 is formed between the actual lower surface of the base plate and the bottom plate 12. In this case, the fuel coarse filter 4 is fixed to the pin 5 by, for example, a press-fit connection (see the right side in FIG. 2) or a quick lock connection (see the left side in FIG. 2). The thickness of the fuel coarse filter 4 increases radially outwardly from the area of the pins 5, in which case the lower surface of the pot bottom 9 and the bottom plate 12 cover almost the entire radial area of the chamber 10. Is completely filled by the fuel coarse filter 4. The pin 5 therefore forms a locking geometry for a quick-lock connection with the pot bottom 9 of the storage pot 2 for fixing the fuel filter 4 and for the bottom plate 12. The bottom plate 12 may be joined by a screw or shrink fit or a hot swage fit.

FIG. 3 shows an axial sectional view of the area of the fuel coarse filter 4 of the fuel feed module 1. FIG. 3 clearly shows the cylindrical shape of the storage pot 2. The coarse fuel filter 4 is mounted between the pot bottom 9 and the bottom plate 12 over a partial area around the circumference. The fuel coarse filter 4 is not provided in the area of the fuel feed module in which the suction jet pump 8 is arranged. In this region, the sealing wall 11 is guided from the lower surface of the pot bottom 9 to the bottom plate 12, whereby in the region of the suction jet pump 8 the pot bottom 9
Chamber 10 formed inside between the bottom plate 12
However, it is closed in the direction of the fuel tank 6 toward the outside.

Since the suction jet pump 8 creates a negative pressure in the chamber 10, the fuel flows substantially radially through the fuel coarse filter 4, so that coarse impurities cannot reach the fuel feed module 1. . Even when the bottom of the fuel tank 6 is not flat, a gap is formed between the coarse fuel filter 4 and the bottom of the fuel tank 6 to allow unpurified fuel to enter the inside of the fuel feed module 1. Is avoided by arranging the bottom plate 12. The direction of flow of fuel through the elements of the fuel coarse filter 4 is indicated by arrows. Inside the chamber 10 there are provided pins 5 for fixing the fuel coarse filter 4 and / or the bottom plate 12. The element of the fuel coarse filter 4 is located at the bottom 9 of the pot.
To the pot bottom 9 by casting. The elements of the fuel coarse filter 4 which bridge the distance between the pot bottom 9 and the bottom plate 12 are therefore of the same height, so that the bottom plate 12 when installed, is thus It almost contacts all the formed elements.

[Brief description of the drawings]

FIG. 1 illustrates a fuel feed module according to the present invention having a storage pot, a fuel pump, a fuel coarse filter, and a bottom plate.

FIG. 2 is a view showing a section of a pin of a storage pot and a bottom plate fixed to the pin.

FIG. 3 is an axial sectional view of the fuel coarse filter of FIG. 1;

[Explanation of symbols]

1 fuel feed module, 2 storage pot, 3
Fuel pump, 4 fuel coarse filter, 5 pins, 6
Fuel tank, 7 pot wall, 8 suction jet pump, 9 pot bottom, 10 chambers, 11
Seal wall, 12 bottom plate

 ──────────────────────────────────────────────────の Continued on the front page (72) Inventor Dieter Schleckenberger Germany Marbach Elf Luther Weg 16

Claims (7)

[Claims] 1. A fuel feed module (1) comprising: a fuel pump (3) for pumping fuel from a fuel tank (6) having a bottom (13) to an internal combustion engine; and a suction jet pump (8). And a fuel coarse filter (4) in front of the fuel pump (3), wherein the fuel pump (3) is arranged in a storage pot (2) having a pot bottom (9). In the above type, a bottom plate (12) is attached to the pot bottom (9) at an interval, and the bottom plate (1
2) rests substantially on the bottom of the fuel tank (6) and between the pot bottom (9) and the bottom plate (12) a chamber (10) for accommodating the coarse fuel filter (4). )
A fuel feed module, wherein a fuel feed module is formed. 2. The fuel feed module according to claim 1, wherein the coarse fuel filter (4) is mounted and mounted on the pot bottom (9). 3. The bottom plate (12) is mounted substantially parallel to the pot bottom (9) and has a diameter substantially corresponding to the diameter of the storage pot (2). 3. The fuel feed module according to 2. 4. The pot bottom (9) has at least one pin (5) to which a bottom plate (12) is fixed. 2. The fuel feed module according to claim 1. 5. The fuel feed module according to claim 4, wherein the bottom plate (12) is fixed to the pin (5) by a quick lock connection. 6. The chamber according to claim 1, wherein the chamber is substantially plate-shaped and is open on a partial circumference to allow fuel to flow substantially radially into the fuel coarse filter.
The fuel feed module according to any one of claims 1 to 5. 7. A negative pressure for sucking fuel is applied between the bottom plate (12) and the pot bottom (9) in the chamber (1).
7. The fuel feed module according to claim 6, wherein the chamber (10) is closed at a partial circumference in the region of the suction jet pump (8) for forming in the 0).