Abstract: A gas filter system including an outer filter element having a first filter medium arranged between a first end cap and a second end cap, and an inner filter element having a second filter medium arranged between a third end cap and a fourth end cap, wherein the first filter medium is arrangeable to surround the second filter medium, wherein the first, third and fourth end caps are open, wherein the outer filter element is closed at the second end cap, wherein the outer filter element has an axial protrusion at the second end cap that protrudes into the inner filter element and exhibits a radially outward facing sealing surface, and wherein the fourth end cap of the inner filter element has a second sealing section for sealing abutment against the sealing surface of the protrusion.

Abstract: A gas filter system comprising an outer filter element having a first filter medium arranged between a first end cap and a second end cap, and an inner filter element having a second filter medium arranged between a third end cap and a fourth end cap, the first filter medium being arrangeable to surround the inner filter medium, wherein the first, second, third and fourth end caps are open.

Abstract: A gas filter system including an outer filter element having a first filter medium arranged between a first end cap and a second end cap, and an inner filter element having a second filter medium arranged between a third end cap and a fourth end cap, wherein the first, second and third end caps are open, the inner filter element is closed at the fourth end cap, the first filter medium is arrangeable to surround the second filter medium, such that the first end cap of the outer filter element surrounds the third end cap of the inner filter element, the first and third end caps are sealed against each other, and such that the second end cap of the outer filter element surrounds the fourth end cap of the inner filter element, and the second and fourth end caps are sealed against each other.

Abstract: A gas filter system including an outer filter element having a first filter medium arranged between a first end cap and a second end cap, and an inner filter element having a second filter medium arranged between a third end cap and a fourth end cap, wherein the first, third and fourth end caps are open, wherein the outer filter element is closed at the second end cap, wherein the first filter medium is arrangeable to surround the second filter medium, such that the outer filter element is sealed against the inner filter element between the second end cap and the fourth end cap.

Abstract: A gas filter system including a housing with a sealing projection and a housing groove; an outer filter element having a first filter medium with a first end cap and a second end cap; and an inner filter element having a second filter medium with a third end cap and a fourth end cap, wherein the first end cap has a first axial end cap projection and the third end cap has a second axial end cap projection, the end cap projections being arranged in the housing groove; the first and second end cap projections forming a common groove into which the sealing projection protrudes for sealing abutment against the first end cap and the third end cap at the common groove. The use of an outer filter element and/or an inner filter element in the gas filter system.

Abstract: An air filter element for an air filter for an internal combustion engine is provided with a filter medium surrounding annularly a longitudinal axis of the air filter element. A first end disk is provided at a first end face of the air filter element, wherein the filter medium is embedded in the first end disk at the first end face. A clean air seal is configured to seal a raw side of the air filter against a clean side of the air filter. The clean air seal and the first end disk are embodied together as one piece. The clean air seal protrudes continuously radially past the filter medium. A filter housing for the air filter element is provided with a filter pot and a cover and has a clean air outlet and a raw air inlet arranged at a side wall of the filter pot.

Abstract: A round filter element for filtering gaseous fluid has a particle filter medium body and a separate noxious gas filter medium body arranged concentrically in relation to the particle filter medium body. The particle filter medium body and the noxious gas filter medium body surround an inwardly positioned flow chamber. A first common end plate flow-tightly covers a respective first end face of the particle filter medium body and of the noxious gas filter medium body. A second common end plate flow-tightly covers a respective second end face of the particle filter medium body and of the noxious gas filter medium body. The particle filter medium body is a filter bellows and the noxious gas filter medium body is a filter bellows. A filter device having a filter housing is provided with such a filter element.

Abstract: A round filter element for gaseous fluid has a particle filter medium body formed as a hollow body for particle filtration and a separate harmful gas filter medium body formed as a hollow body for harmful gas filtration arranged concentrically to the particle filter medium body; together they surround an inner flow chamber. Particle filter medium body and harmful gas filter medium body each have opposed end faces with end disks. A flow-tight separate connection element is connected to an end disk of the particle filter medium body and engages a neighboring end disk of the harmful gas filter medium body or is connected to an end disk of the harmful gas filter medium body and engages a neighboring end disk of the particle filter medium body to produce a flow-tight connection with the neighboring end disk, respectively. A filter device is provided with such a round filter element.

Abstract: A round filter element for filtering gaseous fluid has a particle filter medium body and a separate noxious gas filter medium body arranged concentrically to the particle filter medium body. Particle filter medium body and noxious gas filter medium body surround an inwardly positioned flow chamber. A first common end plate flow-tightly covers a respective first end face of particle filter medium body and noxious gas filter medium body. A second common end plate flow-tightly covers a respective second end face of particle filter medium body and noxious gas filter medium body. A gas-permeable support element is arranged at a wall of the particle filter medium body or of the noxious gas filter medium body. The gas-permeable support element projects into material of at least one of the first and second common end plates and is fixedly connected thereto. A filter device is provided with such a filter element.

Abstract: A filter element for filtering fluid has a filter bellows with a zigzag folded filter medium arranged in a reinforcement frame. A seal is arranged at least partially continuously at least in section at a circumferential side of the filter medium at a raw side inlet surface or clean side outlet surface of the filter bellows. Elongate adhesive sections are arranged along an unwinding of folds of the filter medium in adhesive tracks at an inflow side or outflow side, or both, of the folds. The adhesive tracks at the inflow side and outflow side are arranged offset in transverse direction of the filter medium. At least the adhesive tracks at the outflow side are designed to relieve tension for a length change compensation of the adhesive tracks at the outflow side in relation to filter medium and/or seal. A filter system with such a filter element is provided.

Abstract: A filter element for filtering fluid has a filter bellows with zigzag folded filter medium and provided with a raw side inlet surface and a clean side outlet surface. The filter bellows is arranged in a reinforcement frame. A seal is arranged circumferentially at least partially continuously at least in sections at an outer circumferential side of the filter medium at the raw side inlet surface or clean side outlet surface. Elongate adhesive sections are arranged along an unwinding of the folds of the filter medium in first adhesive tracks at an inflow side or outflow side, or both, of the folds. A cover element is arranged at the clean side outlet surface of the filter bellows and has a plurality of openings for a fluid flow therethrough. The cover element is fixedly connected to the seal. A filter system has such a filter element arranged in a housing.

Abstract: A filter element for filtering a fluid has a frame and a filter bellows provided with a filter medium folded in a zigzag shape to folds. The filter bellows has an inflow face at a raw side of the filter bellows and an outflow face at a clean side of the filter bellows. The filter bellows is arranged in the frame. A seal is arranged circumferentially at least partially continuously at least in sections at an outer circumferential side of the filter medium at the inflow face of the filter bellows or at the outflow face of the filter bellows. Elongate adhesive sections are arranged along at least two adhesive tracks on the filter medium at the inflow face of the filter bellows and/or at the outflow face of the filter bellows. Strain-relief devices for compensating a length change of the at least two adhesive tracks in relation to the filter medium and/or to the seal are provided. A filter system is provided with such a filter element.

Abstract: A filter element for a filter system for filtering a fluid has a filter bellows arranged about a longitudinal axis and enclosing an interior of the filter element. A closed end disk is arranged at a first end of the filter element and closes off the interior of the filter element. An end disk with an opening to the interior of the filter element is arranged at a second end of the filter element oppositely positioned to the first end viewed in direction of the longitudinal axis. The closed end disk has a hollow pin projecting into the interior of the filter element in direction of the longitudinal axis. The filter system has a housing for receiving the exchangeable filter element with a housing part closable by a cover. The hollow pin of the closed end disk can be pushed onto a pin of the housing part.

Abstract: A filter element for a filter system for filtering a fluid has a filter bellows arranged about a longitudinal axis and enclosing an interior of the filter element. An end disk that is provided with an opening to the interior of the filter element is arranged at the filter bellows. The end disk has a bead that is arranged at the opening to the interior and partially surrounds the opening to the interior. The bead projects outwardly in a direction of the longitudinal axis. The filter system has a housing with a cover and a housing part closable by the cover. The filter element can be exchangeably arranged in the housing. The bead, in a mounted state of the filter element in the housing, engages a complementary receptacle arranged at an inner side of the cover.

Abstract: A cover for a filter system for filtering a fluid has a fluid channel arranged at an inner side of the cover. The cover has a rim and at least one opening arranged in the rim to allow the fluid to pass through, wherein the opening is connected in fluid communication with the fluid channel. The fluid channel is connected in fluid communication with the interior of a filter element of the filter system. A seal for the cover has a first sealing ring and a second sealing connected to each other by flanks. The filter system has a housing with a housing part that is closable by the cover. A filter element is exchangeably arranged in the housing, and the fluid channel of the cover is connected in fluid communication to the interior of the filter element.

Abstract: A filter element has a filter medium body with a first side and an oppositely positioned second side, wherein one of the first and second sides is the inflow side of the filter medium body and the other one is the outflow side of the filter medium body. A first sealing or supporting element is arranged at the first side. A second sealing or supporting element is arranged at the second side. At least one force-transmitting adhesive bead extends between the first side and the second side, wherein the at least one adhesive bead is a force transmitting element extending between the first and second sealing or supporting elements.

Abstract: A filter element for filtering a fluid has a filter body with a filter medium folded in a zigzag shape with folds extending in a fold direction. The filter body has an end edge bonding which seals fold ends of the folds. The filter body has an outer contour with recesses. The end edge bonding, in a region of the recesses of the outer contour of the filter body, is embodied discontinuously. The end edge bonding has at least one outwardly positioned first bonding segment and an inwardly positioned second bonding segment, viewed in the fold direction. The inwardly positioned second bonding segment, in a transverse direction relative to the fold direction, is arranged at a spacing to the at least one outwardly positioned first bonding segment. The at least one outwardly positioned first bonding segment and the inwardly positioned second bonding segment bond at least one common fold.

Abstract: A round filter element has a filter medium body with a wall to be flowed through by a fluid to be purified in a radial direction relative to a longitudinal axis of the filter medium body. A circumferentially extending seal carrier is arranged at or adjacent to an end face of the filter medium body. A sealing element is supported at the seal carrier adjacent to a radial outer side of the filter medium body. A positioning element extends into the filter medium body and engages with a correlated housing-associated counter positioning element of a filter housing when the round filter element is installed in the filter housing. The seal carrier separates flow-tightly a raw side of the round filter element from a clean side of the round filter element when the round filter element is installed in the filter housing.

Abstract: A filter element for filtering a fluid has a frame and a filter bellows provided with a filter medium folded in a zigzag shape to folds. The filter bellows has an inflow face at a raw side of the filter bellows and an outflow face at a clean side of the filter bellows. The filter bellows is arranged in the frame. A seal is arranged circumferentially at least partially continuously at least in sections at an outer circumferential side of the filter medium at the inflow face of the filter bellows or at the outflow face of the filter bellows. Elongate adhesive sections are arranged along at least two adhesive tracks on the filter medium at the inflow face of the filter bellows and/or at the outflow face of the filter bellows. Strain-relief devices for compensating a length change of the at least two adhesive tracks in relation to the filter medium and/or to the seal are provided. A filter system is provided with such a filter element.

Abstract: A filter device is disclosed having a round filter element having a filter medium body with an open interior. The filter element is installable into a filter housing having a base filter housing and a housing cover, in which an inflow opening of the cover overlaps against and aligns with an inflow opening of a base housing part such they form a continuous inflow opening. A support mesh cage arranged on the radially outer wall of the annular filter medium body. The filter housing has a longitudinally extended cross-sectional shape in which the inflow opening and an outlet opening are both arranged on the base housing part at opposing sides of the base housing part.