Filtering means for fuel drawing assembly

Details Filtering means for fuel drawing assembly Filtering means for fuel drawing assembly

2001-09-04

2003-07-08

Lithgow, Thomas M. (Department: 1724)

Liquid purification or separation

With repair or assembling means

C210S450000, C210S493200, C123S509000

Reexamination Certificate

active

06589419

ABSTRACT:

The present invention relates to the field of motor vehicle fuel drawing devices comprising a filter.
Many filter arrangements have already been proposed for such fuel drawing devices.
Illustrated in
FIG. 1
attached hereto is an example of an embodiment of a filter proposed by the Applicant company.
This
FIG. 1
shows a filter element
10
placed in a plastic housing
20
.
The filter element
10
possesses a filter body
12
of annular geometry made for example from a pleated piece of paper, arranged between two annular caps at its axial ends, one of which is the cap marked
14
in FIG.
1
. Each of these caps
14
has a generally U-shaped cross section in which the concavity faces toward the filter body
12
, and the web
15
possesses a drawn projection
16
.
This filter element
10
is placed in an annular chamber
22
in the housing
20
, and, as seen in
FIG. 1
, an elastomeric O-ring
30
is fitted between a step
24
formed on the wall of the housing
20
and the projection
16
. This O-ring
30
is designed to prevent leaks between the cap
14
and the housing
20
so that the fuel cannot get around the filter. The fuel therefore passes radially through the filter body
12
.
The structure illustrated in
FIG. 1
may give satisfaction.
However, its operation is dependent on the presence of the O-ring
30
, and if this is forgotten or incorrectly positioned, the filter
12
is useless.
The Applicant company has admittedly attempted to dispense with the O-ring
30
by adapting the positioning of the projection
16
and of the step
24
so that these would come into direct contact. However, these attempts did not prove satisfactory. Specifically, it is very difficult to prevent leaks satisfactorily around an annular surface of this kind between the step
24
and the projection
16
.
Other solutions have been proposed in the literature. However, none gives complete satisfaction. Furthermore, as far as the Applicant company is aware, none of these proposed solutions has really reached an industrial production stage.
By way of non-exhaustive examples, the document DE-A-19718603 recommends the use of a zigzag elastic sealing structure, while documents DE-A-19711531 and DE-A-19646350 recommend sealing structures designed to be engaged/fitted onto opposing mating structures to prevent leaks by a labyrinth or equivalent effect.
The object of the present invention is to propose novel means to simplify filtration structures for motor vehicle fuel drawing assemblies.
This object is achieved in the context of the present invention with a drawing assembly comprising a housing possessing an annular chamber and a filter in said annular chamber, the assembly being characterized in that it comprises at least one annular plastic lip molded integrally on a part connected to the housing or to the filter, in a material capable of elastic deformation and shaped to form an oblique angle to the axis of the filter and of the housing chamber, in such a way that said lip rests, with elastic deformation, and at an angle with a tangential component via its free edge, against an opposite face, of the other of the filter or of the housing, arranged approximately transversely relative to the axis of the filter and of the housing chamber, in order to prevent leaks at this location between the filter and the housing.
In the context of the present invention, the annular lip is preferably molded integrally on a cap that fits on the filter.
Still more precisely, in the context of the present invention, the filter possesses an annular lip of this kind on each of its two end caps.


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