Gas separation – Combined or convertible – In motor vehicle
Reexamination Certificate
1999-12-30
2001-11-06
Simmons, David A. (Department: 1724)
Gas separation
Combined or convertible
In motor vehicle
C055S479000, C055S482000, C055S486000, C055S502000, C055S529000
Reexamination Certificate
active
06312489
ABSTRACT:
BACKGROUND OF THE INVENTION
The invention relates to a filter element for an air filter with a folded filter insert, in particular for the filtering of the intake air of an internal combustion engine.
It is known from DE 42 18 396 A1 that filter elements, particularly when used in the internal combustion engines of trucks and building machinery, are produced with a relatively large filter surface. These filter elements are provided on one side with a seal which runs at least around the edge in order to seal the unfiltered air side from the filtered air side.
The known filter element can be structured additionally such that particular geometries in the filter housing or on the bordering aggregates are accommodated by combining individual filter elements with folds of differing heights. The individual filter elements are then each produced separately and are joined to each other with additional connection links which also function as hinges.
SUMMARY OF THE INVENTION
The object of the invention is to develop a filter element of the kind described in the introduction such that a contour of the folded filter insert, adjustable for optimization, can be achieved simply.
ADVANTAGES OF THE INVENTION
The folded filter insert of the filter element according to the invention advantageously exhibits on its one side a contour which is two-dimensional and at least partially deviates from a plane and additionally exhibits a continuous zigzag folding. According to the invention, in order to optimize the functioning of the filter by better utilizing the space in the region of this side of the filter insert, the filter element can easily be adapted to fit complex structures in the intake region of an internal combustion engine. Due to the good layout of the filter element with respect to the geometry in the intake path, the invention also helps improve the flow pattern on this air intake side of the filter element.
For example, also slopes, pointed or curved contours can be provided on the appropriate side of the filter insert, where, due to the continuous zigzag folds, a largely even functioning of the filter is ensured over the entire filter surface. On the other side of the filter element, a uniformly flat surface is present there without connection links since the regions of different fold height transition continuously into one another.
In a simple method for producing the filter element according to the invention, folded regions of the filter insert with differing fold heights are prefabricated and, during assembly of the filter element, are glued together, stamped together or firmly fixed together in some other way with the fold that adjoins each one.
Separately, it is known from DE 42 23 723 C2 that, in order to produce the zigzag-shaped filter insert, webs with filter paper from a supply roll are unrolled and are imprinted in preparation for folding. These imprinted filter paper webs are then folded in a device at the imprints. In order to produce a filter element in accordance with the invention, the distances between the imprints are varied in a simple way such that different fold heights are achieved and therefore on one side of the folded web a correspondingly changed contour is created.
Other advantageous exemplary embodiments are described hereinafter.
REFERENCES:
patent: 4200444 (1980-04-01), Witchell
patent: 4640779 (1987-02-01), Taki et al.
patent: 5968215 (1999-10-01), Webb
patent: 6059851 (2000-05-01), DePietro, III et al.
patent: 4218396 A1 (1993-12-01), None
patent: 4223723A1 (1994-01-01), None
patent: 0058994 A1 (1982-09-01), None
patent: 0692294 A1 (1996-01-01), None
patent: 2098317 A (1982-04-01), None
Ernst Volker
Klotz Arthur
Sommer Bruno
Filterwerk Mann & Hummel GmbH
Pham Minh-Chau T.
Simmons David A.
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