CN210622953U - Fuel pump - Google Patents

Abstract

The utility model relates to a fuel pump, this fuel pump include the pump core, and this pump core is by the supporting of pump support, the pump support links to each other with the pump flange via the guide bar. According to the invention, the pump bracket has an interface structure for coupling the guide rod, which at least locally comprises a flexible portion. The utility model discloses a fuel pump can restrain the transmission of vibration with compact structure to have advantages such as installation and convenient to use and application scope are extensive.

Description

Fuel pump

Technical Field

The utility model relates to the technical field of automobiles. More specifically, the present invention relates to fuel pumps for automobiles.

Background

Fuel pumps are an important component of the fuel supply system of an automobile, which is installed in the fuel tank of the automobile for pumping fuel in the fuel tank to a fuel supply line and, in turn, to the engine. Fuel pump assemblies are known which essentially comprise a pump cartridge intended to be placed in a fuel tank for temporarily storing the fuel to be pumped, a reservoir box in which the pump cartridge is placed for sucking the fuel in the reservoir box, and a pump flange accessible to an operator for mounting and dismounting the fuel pump assembly. Typically, the fuel pump assembly further includes a pump bracket fixedly mounted in the reservoir box, the pump core being received in the reservoir box by the pump bracket, the pump flange being connected to the pump bracket by the guide rod to thereby connect the pump core and the reservoir box.

A problem with the known fuel pump assembly is that vibrations generated during operation of the pump cartridge are transmitted to the reservoir or pump flange connected thereto and thus generate noise which can be annoying for the driver of the vehicle. For this reason, attempts have been made to reduce such vibration noise. For example, the applicant's utility model CN203614382U discloses a fuel pump damper, which comprises a pump core support cylinder fixed to a pump core of a fuel pump to support the pump core, and a damper bracket connected to the pump core support cylinder and fixed to a cartridge of the fuel pump. The damping device can absorb the vibration generated by the pump core during the operation process, thereby reducing the vibration and the noise of the fuel pump.

However, the known damping device described above is relatively complex in construction and relatively cumbersome to install. In addition, the above-described damper device requires a large space in the reservoir of the fuel pump, and therefore cannot be applied to a case where the available space in the reservoir is small.

SUMMERY OF THE UTILITY MODEL

The utility model discloses aim at providing a damping scheme that all simplifies in the aspect of structure and installation to it can be applicable to more extensive occasion to make it.

To this end, the invention relates to a fuel pump comprising a pump cartridge which is supported by a pump carrier, which pump carrier is connected to a pump flange via a guide rod, wherein the pump carrier has an interface structure for coupling the guide rod, which interface structure at least partially comprises a flexible portion.

The utility model discloses a fuel pump is because the interface structure of the guide bar of direct pair pump support improves, and does not increase extra damping structure, consequently has compact structure, easily sets up and use and does not occupy the advantage in extra space.

The preferred and advantageous technical features of the present invention are as follows:

-the flexible portion of the interface structure is configured to be deformable in a vertical direction;

-the flexible portion has a helical overall shape;

the flexible portion is formed by a plurality of strip-like elements arranged in a spiral and separated from each other, for example, by three strip-like elements;

-the interface structure comprises a first sleeve part and a second sleeve part connected by a flexible part, wherein the first sleeve part is fixed to the body of the pump holder and the second sleeve part directly contacts the guide rod;

-the inner diameter of the first sleeve part is larger than the inner diameter of the second sleeve part;

-the end of the second sleeve portion is provided with a clamping jaw for clamping the guide bar;

-the first sleeve portion, the second sleeve portion and the flexible portion are formed in one piece; and

-the interface structure is integrally formed on the body of the pump holder.

Drawings

Preferred embodiments of the present invention are described below with reference to the accompanying drawings, in which:

FIG. 1 is a perspective view, partially in section, of a fuel pump of an exemplary embodiment of the present invention;

FIG. 2 is a perspective view of a pump bracket in the fuel pump of FIG. 1;

FIG. 3 is a perspective view illustrating, on an enlarged scale, a guide rod interface structure of the pump bracket of FIG. 2;

fig. 4 is a cross-sectional perspective view of the guide bar interface structure of fig. 3 in a state where a guide bar is inserted.

Detailed Description

The technical solution of the present invention is further described in detail by the following examples in conjunction with the accompanying drawings, which are intended to explain the general concept of the present invention and should not be interpreted as a limitation of the present invention.

Referring to fig. 1, as is generally known, a fuel pump may include a pump cartridge 3 and a pump holder 2 for supporting the pump cartridge 3, the pump holder 2 and the pump cartridge 3 may be accommodated in a cartridge 1 and may be connected to a pump flange 4 by a guide rod 5. The reservoir 1 is intended to be placed in a tank. The pump flange 4 is used for mounting the fuel pump on a tank housing.

The guide rod 5 is fixed at one end to the pump flange 4 and at the other end is provided in the pump bracket 2 so as to be capable of having a freedom of movement in the vertical direction (i.e., up and down in the drawing) with respect to the movement of the pump bracket 2, thereby enabling adjustment of the distance or height of the pump flange 4 with respect to the reservoir box 1. For this purpose, the guide rod 5 can be rigid and can be inserted in the vertical direction into an interface structure 21 provided on the pump holder 2. As shown in fig. 1 and 4, the guide rod 5 can be provided with a spring 6, which spring 6 rests with one end against the pump flange 4 and with the other end is connected to the pump bracket 2, in particular is inserted into its interface 21, in order to maintain the connection between the guide rod 5 and the pump bracket 2 on the one hand and to ensure the adjustability of the guide rod 5 in the vertical direction on the other hand.

It should be noted here that the pump flange 4 can be connected to the pump carrier 2 via a plurality of, for example four, guide rods 5 and thus to the reservoir box 1 via the pump carrier 2, and that a spring 6 can be fitted on at least one guide rod 5.

Turning now to fig. 2, the pump holder 2 may comprise an upper circumferential portion 24 and two hollow cylindrical portions 22, 23 extending downwardly from the upper circumferential portion 24. The upper circumferential portion 24 may have a profile which substantially matches the internal profile of the reservoir 1 for fixedly seating in the reservoir 1, for example by way of a tight fit. The hollow cylindrical portions 22, 23 may form respective chambers for accommodating the pump cartridge 3 (see fig. 1) and a pressure regulating valve or other auxiliary components.

The upper circumferential portion 24 and the hollow cylindrical portions 22, 23 may be rigid and may be integrally formed, for example, by injection molding from a polymeric material. In particular, the upper circumferential portion 24 and the hollow cylindrical portions 22, 23 may be spaced apart and connected only by a plurality of sets of legs 25 to give the hollow cylindrical portions 22, 23 freedom of relative movement in the horizontal direction (i.e., the left-right direction in the drawing) with respect to the upper circumferential portion 24, thereby attenuating or even blocking the transmission of vibrations caused by the operation of the pump cartridge 3 or the like from the hollow cylindrical portions 22, 23 to the upper circumferential portion 24.

The pump holder 2 may further comprise an interface formation 21 extending downwardly from said upper circumferential portion 24. As mentioned before, the interface structure 21 is adapted to receive the guide bar 5 and to allow the guide bar 5 to move in a vertical direction.

According to the present invention, the interface structure 21 is configured to at least partially include a flexible portion. In this way, vibrations generated during operation of the pump cartridge 3 can be absorbed by the flexible portion of the interface structure 21 to reduce transmission to the guide rod 5 connected thereto, thereby suppressing or even eliminating noise at the pump flange 4 that may be generated by the vibrations.

It will be appreciated that as long as the portion of the interface structure 21 associated with the guide rods 5 is a flexible portion, it is possible to absorb vibrations from the pump bracket 2 and reduce the transmission of vibrations via the guide rods 5 to the pump flange 4.

In particular, the flexible portion of the interface structure 21 may be configured to have flexibility in the vertical direction. That is, the flexible portion of the interface structure 21 may be configured to deform or flex in a vertical direction. This flexibility of the interface structure 21 in the vertical direction is particularly advantageous for preventing vibrations, in particular vibrations in the vertical direction, from being transmitted along the guide rod 5.

As a preferred embodiment, the flexible portion may have a helical overall shape. That is, the flexible portion may be configured in a form similar to a coil spring. In this way, the flexible portion can absorb vibration components, particularly in the vertical direction, by lengthening and shortening.

Referring to fig. 3, and in conjunction with fig. 2 and 4, in a preferred embodiment of the present invention, the interface structure 21 may include a first sleeve portion 211, a second sleeve portion 212, and a flexible portion 213 connecting the first and second sleeve portions. Said first sleeve part 211 is fixed to the body of the pump holder 2, in particular to the upper circumferential part 24 of the pump holder 2, and is intended to engage a part of the spring 6 on the guide rod 5. The second sleeve portion 212 has an inner diameter smaller than that of the first sleeve portion 211, and serves to engage and hold the guide bar 5 by directly contacting the guide bar 5. The second sleeve part 212 may have a jaw at its free end for maintaining the connection between the interface 21 and the guide bar 5 and for maintaining the position of the guide bar 5 in the vertical direction.

Thus, since the first sleeve portion 211 does not directly contact the guide bar 5, when the pump cartridge 3 operates to cause the pump bracket 2 to undergo vibration, the vibration is transmitted from the first sleeve portion 211 connected to the main body of the pump bracket 2 to the flexible portion 213 directly connected to the first sleeve portion 211, and is absorbed by the flexible portion 213 through deformation or expansion and contraction, without being transmitted to the second sleeve portion 212 and thus to the guide bar 5.

It will be appreciated that although the flexible portion 213 is provided between the first sleeve portion 211 and the second sleeve portion 212 in the foregoing example to isolate vibrations, the flexible portion may be provided at other locations, for example, instead of the first sleeve portion 211 or the second sleeve portion 212, as long as it achieves the effect of isolating vibrations from the pump bracket 2 from the guide rod 5.

Advantageously, the flexible portion 213 may be connected to the first and second sleeve portions 211, 212 in various ways, such as by gluing, riveting or integrally forming.

Still referring to fig. 3, preferably, the flexible portion 213 may be formed by a plurality of, e.g., three, strip-like elements spaced from one another as shown. These strip-like elements may be made of a flexible or semi-rigid material, for example a polymer material, so as to be able to deform, in particular in the vertical direction.

As can be clearly seen in fig. 3, said strip-like element constituting the flexible portion 213 is preferably arranged in a spiral between the first and second sleeve portions 211 and 212. This allows the strip-like element to be made of the same material as the rest of the pump holder 2 and to absorb the vibrations generated by the operation of the pump core 3 by twisting or deformation without changing the overall dimensions of the interface structure 21 in the vertical direction.

It is to be understood that the design of the interface structure 21 of the present invention is not limited to the previously described embodiments. For example, it is conceivable to design the entire interface structure 21 to be flexible. It is also conceivable to form the flexible portion 213 of the interface structure 21 using elements such as flexible sleeves, elastic bands or elastic straps that can surround or wrap the guide rod 5 and can be deformed, in particular in the vertical direction.

Furthermore, the interface structure 21 is preferably formed integrally with the rest of the pump holder 2 by injection moulding, thereby forming a unitary pump holder 2.

Although the present general inventive concept has been described in conjunction with the embodiments, it will be understood by those skilled in the art that various changes and modifications may be made to the embodiments without departing from the principles and spirit of the general inventive concept.

Claims (10)

1. Fuel pump comprising a pump cartridge (3), the pump cartridge (3) being supported by a pump bracket (2), the pump bracket (2) being connected to a pump flange (4) via a guide rod (5), characterized in that the pump bracket (2) has an interface structure (21) for coupling the guide rod (5), the interface structure (21) at least partially comprising a flexible portion (213).

2. A fuel pump according to claim 1, characterized in that the flexible portion (213) of the interface structure (21) is configured to be deformable in a vertical direction.

3. A fuel pump according to claim 2, characterized in that the flexible portion (213) has a helical overall shape.

4. A fuel pump according to claim 3, characterized in that the flexible portion (213) is formed by a plurality of strip-like elements arranged in a spiral and separated from each other.

5. A fuel pump according to claim 4, characterized in that the flexible portion (213) is formed by three strip-like elements.

6. Fuel pump according to one of claims 1 to 5, characterized in that the interface structure (21) comprises a first sleeve part (211) and a second sleeve part (212) which are connected by a flexible part (213), wherein the first sleeve part (211) is fixed on the body of the pump bracket (2) and the second sleeve part (212) directly contacts the guide rod (5).

7. The fuel pump of claim 6, wherein the first sleeve portion (211) has an inner diameter greater than an inner diameter of the second sleeve portion (212).

8. The fuel pump as claimed in claim 6, characterized in that the end of the second sleeve part (212) is provided with a clamping jaw for clamping the guide rod (5).

9. The fuel pump of claim 6, wherein the first sleeve portion (211), the second sleeve portion (212), and the flexible portion (213) are formed as one piece.

10. A fuel pump according to claim 6, characterized in that the interface formation (21) is integrally formed on the body of the pump bracket (2).

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