Fuel pump assembly

The invention relates to a fuel pump assembly, which comprises a fuel pump (2), a fuel tank (3), in which the fuel pump (2) is at least partially arranged, an intermediate component (4), which is arranged on the outside of the fuel tank (3) and has a fuel connection to the fuel tank (3), and a filter (5), which is arranged in a filter chamber (6) and is arranged on the outside of the intermediate component (4) or the fuel pump (2). According to the invention, a fuel flow flows from an interior (30) of the fuel tank (3) through a first opening (40) of the intermediate component (4) outward into the filter chamber (6) and from the filter chamber (6) through the filter (5) and through a second opening (41) of the intermediate component (4) to an inlet (20) of the fuel pump (2).

BACKGROUND OF THE INVENTION

The present invention relates to a fuel pump assembly having a fuel pump, in particular for motorcycles, and to a fuel tank.

In previously known fuel assemblies, a filter is used to filter the fuel. In particular, the filter is arranged either in the fuel tank on the fuel pump, or outside the fuel tank with a hose for connecting the filter to the fuel pump. However, both of these assemblies have the disadvantage that exchanging the filter is a complex operation. Thus, either the entire fuel assembly has to be disassembled to remove the filter from the fuel tank, or the hose connections must be detached or removed.

SUMMARY OF THE INVENTION

In contrast, the fuel pump assembly according to the invention, has the advantage that fitting and removal of a filter for a fuel pump is made significantly easier. Thus, cleaning or exchange of the filter is simplified. As a result, the associated costs are also considerably reduced. According to the invention, this is achieved by bringing the filter element into direct contact with the fuel pump or with an intermediate component, arranged on a fuel tank, outside the fuel tank. Here, the fuel pump assembly according to the invention comprises a fuel pump, a fuel tank, in which the fuel pump is at least partially arranged, an intermediate component, which is arranged on the outside of the fuel tank and has a fuel connection to the fuel tank, and a filter, which is arranged in a filter chamber. According to the invention, the filter is arranged on the outside of the intermediate component or the fuel pump, wherein a fuel flow flows from an interior of the fuel tank through a first opening of the intermediate component outward into the filter chamber and from the filter chamber through the filter and a second opening of the intermediate component to an inlet of the fuel pump. As a particular preference, the fuel pump is arranged completely in the fuel tank, wherein the filter is arranged on the intermediate component. The presence of the intermediate component has the advantage that the intermediate component can be matched to customer-specific requirements, while the filter and the fuel pump can be produced in a standardized way.

As an alternative, the fuel tank and the intermediate component can preferably be of integral design. The fuel tank and the intermediate component can be produced at low cost as an injection molding, for example. Moreover, potential sealing problems between the fuel tank and the intermediate component can be avoided by means of an integral construction.

As a further preference, the fuel pump can furthermore comprise a holding element, wherein the filter is held exchangeably on the intermediate component by the holding element, and the holding element defines the filter chamber. Thus, the filter can be fastened detachably on the intermediate component. In addition to the holding function, the holding element defines the filter chamber, in which the filter is arranged and which the fuel from the fuel tank enters before being fed into the fuel pump. A compact construction is thereby made possible.

According to an advantageous embodiment of the present invention, the holding element is of substantially pot-shaped design, having a wall region and the bottom region, wherein the filter is supported on the bottom region of the holding element. Here, a cavity of the pot-shaped holding element corresponds to the filter chamber.

As a further preference, the fuel pump assembly can comprise a detachable connection, in particular a latching connection, between the holding element and the intermediate component. Thus, a quickly established and reliable connection between the holding element and the intermediate component is made possible. Once the holding element has been removed from the intermediate component, there is easy access to the filter. In particular, the holding element has at least one latching hook, which is arranged in such a way that it can be latched into at least one groove of the intermediate component. The latching hook can be formed on the holding element so as to encircle the latter, wherein the latching hook is arranged in such a way that it can be latched into a groove formed around the outer circumference of the intermediate component.

A first sealing element is advantageously arranged between the filter and the intermediate component. Thus, leaktightness between the filter and the intermediate component is ensured, thus preventing fuel that has already been filtered from reentering the filter chamber. Thus, continuous delivery of fuel by the fuel pump without dips in the delivery quantity is made possible.

It is furthermore advantageous if a second sealing element is arranged between the filter and the holding element. In this way, leaktightness between the filter and the holding element is ensured, thus preventing fuel from escaping into the environment of the fuel pump assembly. Failsafe operation of the fuel pump is thereby furthermore ensured.

As an alternative or in addition, the holding element can have a sealing device. This sealing device can preferably comprise an intermediate wall region formed in an encircling manner in the filter chamber, which intermediate wall region is spaced apart from a wall region of the holding element and divides the filter chamber into a first subchamber and a second subchamber. The intermediate wall region is arranged in such a way that the second subchamber is of smaller design than the first subchamber, wherein the filter is situated in the first subchamber. Thus, fuel which is not drawn in by the fuel pump can enter the second subchamber. The presence of the intermediate wall region reduces the pressure of the fuel which is not drawn in, thereby preventing the fuel from escaping into the environment. If there is a sealing element between the filter and the holding element, the first subchamber is separated from the second subchamber by the sealing element. In such a case, the sealing device serves as a further protective measure against leaks. As an alternative, the sealing device can be designed as a labyrinth seal.

As a further preference, the filter and the fuel pump can be arranged in series on a common line. As a further preference, the intermediate component and the holding element can also be arranged on the same common line. The common line preferably corresponds to a central axis of the fuel pump. Thus, a compact construction and short flow distance are possible.

It can furthermore be advantageous if the intermediate component is of substantially pot-shaped design, wherein the first opening and the second opening are arranged in a bottom of the intermediate component, and wherein the intermediate component is in flow connection with the filter via the first opening, and the filter is in flow connection with the inlet of the fuel pump via the second opening. The fuel tank preferably has a fuel tank opening, via which the fuel tank communicates with the intermediate component.

The fuel pump assembly can furthermore advantageously comprise a check valve, which is arranged at the first opening of the intermediate component. Thus, the filter can be exchanged at any time without first having to empty the fuel tank.

DETAILED DESCRIPTION

A fuel pump assembly1according to a preferred illustrative embodiment of the present invention is described in detail below with reference toFIG. 1.

As can be seen fromFIG. 1, the fuel pump assembly1comprises a fuel pump2, a fuel tank3, in which the fuel pump2is partially arranged, an intermediate component4and a filter6.

The intermediate component4is arranged on the outside of the fuel tank3and is in flow connection with the fuel tank3via a fuel tank opening31. The filter5is arranged in a filter chamber6on the outside of the intermediate component4. Thus, a fuel flow flows from an interior30of the fuel tank3through a first opening40of the intermediate component4outward into the filter chamber6and from the filter chamber6through the filter5, a filter opening50and through a second opening41of the intermediate component4to an inlet20of the fuel pump2(arrows A). From there, the fuel is pumped onward by the fuel pump2(arrow B).

In this illustrative embodiment, the fuel tank3and the intermediate component4are designed as separate components. As an alternative, the intermediate component4can be integrated with the fuel tank3.

The intermediate component4is of substantially pot-shaped design, wherein the first opening40and the second opening41are arranged adjacent to one another in a bottom of the intermediate component4. The intermediate component is in flow connection via the first opening40with the filter chamber6, which is in flow connection via the second opening41with the inlet20of the fuel pump2. At the first opening40, a check valve12is provided, which is shown in an open state inFIG. 1. The fuel tank3has a fuel tank opening31, via which the fuel tank3communicates with the intermediate component4.

The fuel pump assembly1furthermore comprises a holding element7, wherein the filter5is held exchangeably on the intermediate component4by the holding element7. The holding element7is fastened detachably on the intermediate component4by a latching connection8. In particular, the latching connection8has a latching hook80, which engages in a groove81formed around the outer circumference of the intermediate component.

The holding element7, which defines the filter chamber6, is likewise of pot-shaped design. Moreover, the holding element7comprises a wall region70and a bottom region71, on which the filter5is arranged. Furthermore, the holding element7has a sealing device11. The sealing device has an intermediate wall region72, which is of encircling design and is spaced apart from the wall region70. The intermediate wall region72divides the filter chamber6into a first subchamber60and a second subchamber61, wherein the second subchamber61has an annular cross section. The first subchamber60, in which the filter5is situated, is of larger design than the second subchamber61.

Furthermore, a first sealing element9is provided between the intermediate component4and the filter6. The sealing element9prevents already filtered fuel from reentering the filter chamber6. In order, together with the sealing device11, to ensure leaktightness against fuel leaks to the outside, a second sealing element10is furthermore arranged between the intermediate component4and the holding element7. By means of the second sealing element10, the first subchamber60of the filter chamber6is separated from the second subchamber61. Sealing element9and sealing element10are designed as O-rings.

The filter5and the fuel pump2are arranged in series on a common line M, which corresponds to a center line of the fuel pump2. The intermediate component4and the holding element7are furthermore likewise arranged on the common line M. Thus, a compact construction of the fuel pump assembly1and a short flow distance of the fuel from the interior30of the fuel tank3to the fuel pump2are possible.

The fuel pump assembly1according to the invention significantly reduces the effort involved in fitting and removal and hence the corresponding costs for exchanging the filter5.