The invention relates to a fuel delivery unit of a motor vehicle, with a swirl pot and with a prefilter which has a filter element and is intended for filtering the fuel flowing into the swirl pot.
Delivery units with swirl pots of this type are frequently used in motor vehicles nowadays and are known from practice. In the case of the known delivery units, the swirl pot is connected to the filter element of the prefilter. If an appropriately sized filter capacity of the prefilter is to be ensured, an appropriately sized filter element of the prefilter is used. A disadvantage of the known fuel delivery unit is that it is highly cost-intensive to keep different filter elements in stock.
The invention is based on the problem of developing a fuel delivery unit of the type mentioned at the beginning in such a manner that it can be adapted particularly cost-effectively to designated filter capacities.
This problem is solved according to the invention in that the prefilter has a support with at least one connection piece, which is closed in the basic state, for the installation of an additional filter element.
By means of this configuration, the fuel delivery unit according to the invention can be equipped with the additional filter element as well as with the filter element. The filter element preferably has a sufficient filter surface for most applications. If a particularly large filter capacity of the prefilter is to be ensured, the additional filter element can be fitted on the connection piece. Therefore, the fuel delivery unit according to the invention can be adapted particularly cost-effectively to the designated filter capacity.
The fuel delivery unit according to the invention turns out to be particularly compact if the support and a base plate closing the swirl pot delimit a collecting chamber for collecting the prefiltered fuel, if an intake connection of a fuel pump is connected to the collecting chamber, and if the connection piece protrudes into the interior of the swirl pot.
The support could be designed, for example, as a closed wall with a plurality of connection pieces. In this case, the filter element could be designed as the additional filter element and could be fitted on one of the connection pieces. The fuel delivery unit according to the invention turns out to be particularly compact if the filter element is designed as a partial region of the support. By means of this configuration, the swirl pot has at least the filter element which is designed as a partial region of the support. If the filter surface is to be enlarged, one or more other additional filter elements is or are fitted to the corresponding connection piece or connection pieces.
According to another advantageous development of the invention, the prefilter has a particularly large filter surface if the filter element is adjacent to the at least one connection piece.
According to another advantageous development of the invention, the installation of the prefilter turns out to be particularly simple if the filter element is connected to the swirl pot and/or to the support with a cohesive material joint. By means of this configuration, the swirl pot, in the basic state, has at least a single filter element and, if the need arises, can be provided with a particularly large surface area by the installation of the additional filter element on the connection piece.
The additional filter element to be fitted to the connection piece turns out to be particularly compact, according to another advantageous development of the invention, on the additional filter element provided for installation on the connection piece has a connector and a filter fabric protruding from the connector, and if the filter fabric is of bag-shaped design. The bag-shaped filter fabric can be produced, for example, from a tubular filter fabric by the connector being connected to one end of the tubular filter fabric and the other end being closed.
According to another advantageous development of the invention, the prefilter which is fitted on the support has a high degree of stability if the connection piece surrounds the connector of the attached additional filter element. Furthermore, the connector of the additional filter element is capable of sealing the opened connection piece.
The installation of the additional filter element is simplified, according to another advantageous development of the invention, if the connection piece protrudes in the shape of a tube from the support, and if the support has an at least partially encircling groove as a predetermined breaking point within the connection piece. By means of this configuration, the additional filter element is pressed, upon installation, into the connection piece until the connector can break open the support at the encircling groove. Subsequently, the connector of the additional filter element is inserted in the connection piece and seals the latter. The connector preferably has an end edge for breaking open the predetermined breaking point. The additional filter element can therefore be fitted without a tool.
The invention permits numerous embodiments. To further clarify its basic principle, one of said embodiments is illustrated in the drawing and is described below. In the drawing
and has two connection pieces 13, 14. An additional filter element 15 is connected to one of the connection pieces 13 while the other connection piece 14 is sealed.
Fuel flowing into the swirl pot 1 passes via the prefilter 11 into the collecting chamber 12 and therefore to the intake connection 10 of the fuel pump 2. The fuel pump 2 is therefore capable of sucking up prefiltered fuel from the swirl pot 1 and of delivering said fuel via the fine filter 3 to the feed connection 5 for the feed line. The casing 9 of the swirl pot 1 has an edge 17 which engages over a supporting edge 16 of the base plate 8. The edge 17 and the supporting edge 16 are connected to each other in a sealing manner.
In order to enlarge the filter surface of the prefilter 11, an additional filter element 15 like the one illustrated in
In the basic state after the manufacturing of the prefilter 11, the connection pieces 13, 14, as per the one from
Number | Date | Country | Kind |
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102006032100.6 | Jul 2006 | DE | national |
Filing Document | Filing Date | Country | Kind | 371c Date |
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PCT/EP07/56993 | 7/9/2007 | WO | 00 | 2/19/2009 |