Filter element and filter system

1. A filter element, comprising: a zigzag-folded filter medium ( 10 ) arranged in a tubular concentric shape; a first end plate ( 11 ) arranged at an axial end face of said concentric filter medium, said first end plate having a central portion that is either open or closed; and a second end plate ( 12 ) arranged at an opposing axial end face of said filter medium; wherein said second end plate ( 12 ) includes a concentric opening ( 13 ) therethrough, said second end plate extending substantially in a circular ring-shape about end face folds of the filter medium; wherein said second end plate ( 12 ) includes an outwards facing ring face including a first annular bead ( 14 ) extending axially outwards from said second end plate in a direction axially away from said filter element; wherein said outwards facing ring face of said second end plate includes a sealing groove ( 16 ) formed in said ring face; wherein the annular bead ( 14 ) includes at least one outer end face ( 18 , 19 ), said at least one outer end face ( 18 , 19 ) is configured to be supportively received against support ribs ( 20 , 21 ) provided in a housing configured to receive said filter element; wherein the reinforcement plate ( 17 ) is embedded into the second end plate, wherein the reinforcement plate has perforations ( 22 ) operable to support flow of polyurethane foam providing a positive-locking connection between said filter medium and said reinforcement plate.

2. A filter element, comprising: a zigzag-folded filter medium ( 10 ) arranged in a tubular concentric shape; a first end plate ( 11 ) arranged at an axial end face of said concentric filter medium, said first end plate having a central portion that is either open or closed; and a second end plate ( 12 ) arranged at an opposing axial end face of said filter medium; wherein said second end plate ( 12 ) includes a concentric opening ( 13 ) therethrough, said second end plate extending substantially in a circular ring-shape about end face folds of the filter medium; wherein said second end plate ( 12 ) includes an outwards facing ring face including a first annular bead ( 14 ) extending axially outwards from said second end plate in a direction axially away from said filter element; wherein said outwards facing ring face of said second end plate includes a sealing groove ( 16 ) formed in said ring face; wherein the annular bead ( 14 ) includes at least one outer end face ( 18 , 19 ), said at least one outer end face ( 18 , 19 ) is configured to be supportively received against support ribs ( 20 , 21 ) provided in a housing configured to receive said filter element; wherein said second end plate has a second annular bead ( 15 ) extending axially outwards from said second end plate in a direction axially away from said filter element, said second annular bead ( 15 ) concentrically spaced from said annular bead ( 14 ); wherein said annular beads have facing sidewalls defining said sealing groove ( 16 ) therebetween.

3. The filter element according to claim 2 , wherein

the second end plate further includes a reinforcement plate ( 17 ) or a reinforcement ring arranged in an area between the said filter medium end face and said annular bead.

4. The filter element according to claim 2 , wherein

the second end plate ( 12 ) is comprised of polyurethane foam or an elastomer.

5. The filter element according to claim 2 , wherein

the reinforcement plate has an annular surface ( 23 ) extending in axial direction outwardly across the filter element.

6. The filter element according to claim 2 , wherein

the first end plate ( 11 ) is comprised of polyurethane foam and has a concentrically arranged closure member ( 24 ) that seals an interior space ( 25 ) of the filter element ( 10 ) in the area of this end plate.

7. The filter element according to claim 2 ,

wherein said first end plate is also provided with said axially extending beads and said sealing groove as in said second end plate.

8. A filter system with a filter element according to claim 2 , comprising:

a housing ( 26 ) that is substantially concentrically configured relative to said filter element said configured to receive said filter element therein;

a cover ( 27 ) closing off the housing ( 26 ) and also concentrically configured;

an inlet ( 28 ) arranged on the housing and/or the cover, said inlet configured to supply medium to be filtered to the filter;

an outlet concentrically arranged on the housing ( 26 ) and configured to discharge filtered medium; and

a sealing contour provided on an inner surface of said housing, said sealing contour a configured to sealably match at least one of the sealing beads ( 14 , 15 ) and the sealing groove ( 16 ).

9. The filter system according to claim 8 , wherein

the sealing contour on said housing is comprised of two concentric axially extending annular grooves ( 31 , 32 ); and

a sealing stay ring ( 33 ) is arranged between the two annular housing grooves;

wherein the annular grooves at a groove bottom include radially extending ribs ( 20 , 21 ) extending across said housing grooves; and

wherein the sealing stay ( 33 ) has a height that is less than the sealing groove ( 16 ) of the filter element.

10. The filter system according to claim 8 , further comprising:

a cyclone preseparator ( 34 ) is arranged inside said housing between said housing and said filter element; and

a dirt outlet ( 35 ) is arranged on said housing ( 26 ) or on said cover ( 27 ).

11. The filter system according to claim 8 , further comprising:

a secondary element ( 36 ) is positioned at an interior of the filter system and configured to maintain the outlet closed off during exchange of the filter element.

12. The filter system according to claim 11 , wherein

the secondary element ( 36 ) is connected by a screw connection to the housing ( 26 ).