JPH1030513A - Transport unit for transporting fuel - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a fuel transfer device which can reliably perform a seal between a casing of a fuel pump and a suction filter, and can easily and inexpensively assemble both members. I do. A transport unit (10) for transporting fuel from a storage tank to an internal combustion engine, comprising a fuel pump (11) having a casing (13) and a suction filter (12) having a bowl shape, and a filter holder for the suction filter (12). 17
A cylindrical or annular wall 22 of the type that at least partially surrounds the casing 13 of the fuel pump 11 in the longitudinal direction of the casing, wherein the wall 22 of the filter holder 17 has At least one annular sealing strand 24 joined together
have.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a transport unit for transporting fuel from a storage tank to an internal combustion engine, comprising a preferably electrically driven fuel pump with a casing and a bowl-shaped suction filter. The filter holder of the suction filter has an annular wall, which wall at least partially surrounds the casing of the fuel pump in the longitudinal direction of the casing.

[0002]

2. Description of the Related Art In a known transport unit of this type, a bowl-shaped suction filter is fitted over a cylindrical casing of a fuel pump with a cylindrical or annular wall made of a plastic material. The fixing of the suction filter in the housing of the fuel pump takes place in this case via a flat-shaped press connection provided between the two parts. A sealing ring is provided for sealing the suction side of the fuel pump, to which the filtered fuel is supplied, to its surroundings, the sealing ring being formed on the suction filter when viewed in the longitudinal direction of the transport unit. Between the shoulder and the raised portion formed in the casing of the fuel pump.

[0003] In such a flatly formed press joint, the bulging properties (Quellverhalten) of the plastics act unfavorably when the press joint contacts the fuel. This, in extreme cases, leads to:
That is, in this case, the preload that originally exists between the suction filter and the fuel pump casing is reduced, and the suction filter may be dissociated from the fuel pump. Increasing the preload between the two parts to compensate for the bulge is only possible in a limited way on the basis of the increased bonding force for producing the transport unit. If the joining force increases, additional assembly aids are required to assemble the suction filter by hand.

In order to reduce the bulging properties of plastics, it is known to embed a metal ring into the wall of the suction filter in the press or sealing area during the injection, but such a cumbersome and expensive production method is used. The suction filter manufactured on the basis of this is very expensive.

[0005]

The object of the invention is therefore to improve a fuel delivery unit of the type mentioned at the outset,
An object of the present invention is to provide a fuel transfer device that can reliably perform sealing between a casing of a fuel pump and a suction filter and that can easily and inexpensively assemble both members.

[0006]

SUMMARY OF THE INVENTION In order to solve this problem, according to an embodiment of the present invention, the wall of the filter holder has at least one annular sealing strand integrally connected to the wall. I did it.

[0007]

The transport unit constructed as in the present invention has the following advantages as compared with known units. Thus, the conveying unit according to the invention has the advantage that the suction filter is sealed against the casing of the fuel pump by a defined sealing edge. This sealing edge, closed or annular in its contour, is formed by the sealing strand,
This sealing strand is integrally formed when manufacturing the wall of the filter holder. This is done in the injection mold with little increase in cost. Thus, in the transport unit according to the invention, a separate sealing element can be dispensed with and the costs for materials, assembly and inspection can be reduced.

[0008] Another advantageous embodiment of the invention is described in claim 2.

If, for example, the sealing strand has a wavy course, the preload on the casing of the fuel pump, which is necessary for the sealing action of the sealing strand,
It is converted to a three-dimensional bending load acting on the suction filter, and not to elongation at the periphery.
As a result, the joining forces required for assembling the suction filter are relatively small. This also sets the pre-load of the suction filter as follows, i.e., that the pre-load is still sufficient to ensure the adhering of the suction filter and the sealing action of the suction filter, even after inflation of the plastic material. To be able to

In this case, the bonding force has a value such that manual assembly of the suction filter is possible without using additional auxiliary means.

[0011]

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

FIG. 1 shows a transfer unit 10 for transferring fuel from a storage tank to an internal combustion engine of a motor vehicle (not shown). The transfer unit 10 includes an electric drive type fuel pump 11 and a suction filter 12. The fuel pump 11 has a substantially drum-shaped casing 13, on both ends of which a liquid connection 14 and an electrical connection 15 of the fuel pump 11 are provided.
Are formed. The electric connection part 15 is arranged on the head-side end face together with the liquid connection part 14 on the pressure side. The suction opening (not shown) of the fuel pump 11 is
It is configured on the end face on the foot side so as to face each other. This arrangement allows the fuel pump 11 to flow through the fuel during its operation and to be cooled. A raised portion 16 is formed on an outer peripheral portion of the drum-shaped casing 13, and the raised portion 16
It works to fix the position of the suction filter 12 connected to the fuel pump 11.

The suction filter 12 is formed by a filter holder 17 formed in a bowl shape, and the filter holder 17 is made of an elastic plastic material by an injection molding method. On the bottom part 18 of the filter holder 17,
A notch 19 is provided, and the notch 19 is covered by a filter fabric 20. The filter woven fabric 20 is irremovably embedded in the plastic material of the filter holder 17 at its outer edge. Pot-shaped filter holder 1
The cylinder 18 has a cylindrical or annular wall 22 connected to the bottom 18 perpendicularly to the bottom 18. The wall 22 has an inner diameter substantially corresponding to the outer diameter of the casing 13 of the fuel pump 11. Has restricted. The suction filter 12 is fitted over the casing 13 of the combustion pump 11 by the wall 22. The filter fabric 20 thus brought just before the suction opening protects the interior area of the fuel pump 11 from the coarse contaminants contained in the sucked-in fuel, thereby preventing otherwise possible damage. .

Furthermore, it is necessary to seal the gap 23 (FIG. 2) between the suction filter 12 and the fuel pump 11. This seal is located on the suction filter 12
Is formed in the form of a seal strand 24 formed inside the wall. Annular closed seal strand 24
Is formed integrally with the wall 22 and the transfer unit 1
0 extends in a virtual plane perpendicular to the longitudinal direction. The production of the seal strand 24 is performed by the filter holder 1.
7 during the injection molding without too much cost. The sealing strand 24 is substantially triangular in cross section, with the rounded corners serving as sealing edges 25. Since the inner diameter limited by the seal edge 25 is smaller than the outer diameter of the fuel pump 11, the suction filter 12 is under preload and tensioned when mounted on the fuel pump.

From the bottom 18 of the suction filter 12 to the wall 22
Seal strand 24 arranged at lower third
Has a wavy course 26 towards the curved wall, as shown in FIG. Evolution 26 of this waveform
Form a plurality of, preferably two, wave troughs 27 or wave peaks 28 over the entire circumference of the wall 22. Due to such a course 26, the suction filter 12 does not come into immediate contact with the casing 13 of the fuel pump 11 over its entire circumference during its installation, but if the suction filter 12 Immediate contact with the casing 13 of the eleventh case results in a premature loading of the suction filter 12 which causes a circumferential extension and thus a significant increase in the bonding force. Corrugated course 26, on the other hand, allows wall 22 to be initially bent loaded during installation of suction filter 12, thereby significantly reducing the resulting bonding force.

In this way, the preload of the sealing strand 24 can now be increased, so that the preload guarantees the function of the sealing strand 24 even after the filter holder 17 has expanded due to contact with fuel. To ensure that the suction filter 12 is seated firmly on the fuel pump 11, it is still sufficient, and no auxiliary equipment is required for the manual mounting of the suction filter 12.

The fixing of the position of the suction filter 12 in the longitudinal direction of the transport unit 10, together with the additional prevention of undesired disengagement of the suction filter 12 from the fuel pump 11, results in a configuration between the two members. This is achieved by an associative snap connection 29 (FIG. 1).

For this purpose, the filter holder 17 has an enlarged inner diameter in the region of its opening. The transition region 30 (FIG. 1) between the small inner diameter and the larger inner diameter which results from this on the wall 22 of the suction filter 12 is a ridge in the mounting direction of the suction filter 12 when the suction filter 12 is mounted. It is supported by 16 front shoulders. The pressing force acting on the suction filter 12 can thereby be received.

The tensile force acting on the suction filter 12 is received by a wedge-shaped locking projection 32 in the mounting direction of the suction filter 12. For this purpose, a plurality of such locking projections 32 are formed so as to be distributed and arranged over the entire circumference of the wall 22 within a large inner diameter range. The locking projection 32 is initially enlarged by the ridge 16 during installation of the suction filter 12. In the end position of the suction filter 12, the locking projection 32 is spring-resiliently engaged behind the ridge 16 on its steep dorsal side. As a result, a shape connection (Form) is formed between the suction filter 12 and the fuel pump 11.
schluss), and through this shape connection,
The tensile force acting on the suction filter 12 can be received.

Of course, the invention is not limited to the embodiment shown, but various modifications are possible without departing from the scope of the invention.

For example, it is possible to omit the snap connection 29 completely or to form a plurality of seal strands 24 of the same type.

[Brief description of the drawings]

FIG. 1 shows a fuel transfer unit, in which the suction filter is shown in cross section.

FIG. 2 is a view showing a portion X in FIG. 1 and is an enlarged view showing a profile of a cross section of a seal strand.

FIG. 3 is an enlarged view showing a bent portion of a seal strand extending in a circumferential direction of a wall.

[Explanation of symbols]

Reference Signs List 10 transport unit, 11 fuel pump, 12 suction filter, 13 casing, 16 ridge,
17 filter holder, 18 bottom, 19 notch, 20 filter fabric, 22 wall, 23 gap, 24 seal strand, 25 seal edge, 26 waveform, 27 wave trough, 28 wave peak, 29 snap joint , 30 transition areas, 3
2 Locking projection

Claims (9)

[Claims] A transport unit (10) for transporting fuel from a storage tank to an internal combustion engine, comprising a casing (13).
Preferably an electrically driven fuel pump (11) with:
A suction filter (12) in the form of a bowl, and the filter holder (17) of the suction filter (12) has a cylindrical or annular wall (22).
2) in which the casing (13) of the fuel pump (11) at least partially surrounds the casing in the longitudinal direction of the casing.
A transport unit for transporting fuel, characterized in that the wall (22) has at least one annular sealing strand (24) integrally connected with the wall (22). 2. At least one sealing strand (2)
4. The transport unit according to claim 1, wherein 4) has a waveform profile (26). 3. The transport unit according to claim 1, wherein the sealing strand extends in a plane arranged at right angles to the longitudinal axis of the filter holder. 4. At least one sealing strand (2)
4) has a substantially triangular cross section, and the corners of the fuel pump (11) facing the casing (13) are formed as sealing edges (25). 4. The transport unit according to any one of 3 to 3. 5. An inner diameter of the filter holder (17) limited by a sealing edge (25) of the sealing strand (24) is smaller than an outer diameter of the fuel pump (11).
The transport unit according to claim 4. 6. The transport unit according to claim 1, wherein the filter carrier is made of an elastic plastic material. 7. A pot-shaped suction filter (12) having an enlarged inner diameter in the area of its opening and having at least one locking projection (32) in this area, said locking projection (32). When the transport unit (10) is assembled, the casing (1) of the fuel pump (11) is
7. The transport unit according to claim 1, wherein the transport unit is adapted to engage from behind an annular ridge formed in 3). 8. 8. At least one sealing strand (2)
8. The transport according to claim 1, wherein 4) extends from the bottom (18) of the suction filter (12) to one-third of the way below the wall (22). unit. 9. A filter woven fabric (20) is arranged at the bottom (18) of the suction filter (12), and an edge zone of the filter woven fabric (20) is provided in the filter holder (1).
The transport unit according to any one of claims 1 to 8, wherein the transport unit is irremovably embedded in the plastic material of (7).