Abstract: A filter element, in particular an air filter element, has a filter media body surrounding a hollow interior and has a first end and an opposite second end. A first end cap is positioned on the first end of the filter media body, and a second end cap is positioned on the second end of the filter media body. The second end cap is a closed end cap. The second end cap has a plurality of spaced-apart inner adapter projections arranged thereon and projecting in direction of a central axis away from the first end cap. At least some of the inner adapter projections are positioned in a circular arrangement so as to surround a center of the second end cap. Such a filter element is arranged in a housing of a filter system provided with a receiver arrangement for the filter element.

Abstract: A filter system for filtering a fluid has a filter housing with housing top part and housing bottom part, wherein the housing top and bottom parts extend along a housing axis. A filter pack arranged in the filter housing separates fluid-tightly a clean fluid side and a raw fluid side from each other. The filter pack has a filter element with a hollow cylinder-type filter bellows arranged about a longitudinal axis of the filter element. The filter element has a first substantially closed end face and a first end disk arranged thereat, wherein the first end disk is positioned opposite a second end disk of the filter element. The second end disk has a fluid passage for filtered fluid. A resonator with an end closed by a bottom is arranged inside the filter pack such that the bottom is oriented toward the first end disk of the filter element.

Abstract: A filter element for a filter system has a hollow cylinder-type filter bellows with an end face and a substantially closed bottom provided thereat. At least one resonator structure provided at the bottom provides noise attenuation of a flowing fluid. The resonator structure has two or more grooves arranged at an outer side of the bottom and separated from each other by a partition. At least one of the grooves is connected in fluid communication through an opening to an interior of the filter element. The resonator structure, when installed in a filter housing of the filter system as intended, seals tightly relative to a complementary resonator structure of the filter housing. The grooves are connected in fluid communication through connection openings arranged in the resonator structure of the filter element and/or the complementary resonator structure of the filter housing. A filter system with such a filter element is provided.

Abstract: A filter element for filtering fluid has a fold pack formed of a filter medium folded in a zigzag shape or corrugated shape and provided with fold sections delimited by fold edges. The fold sections include at least two directly neighboring fold sections connected to each other by an adhesive connection of an adhesive material and extending along an adhesive line. The adhesive line extends at least in sections obliquely to the fold edge positioned between the at least two directly neighboring fold sections or the adhesive line extends offset along the fold edge positioned between the at least two directly neighboring fold sections. A filter element with one or more adhesive walls of an adhesive material extending within the fold pack and formed by adhesive connections of directly neighboring fold sections of the fold pack is provided. A method for producing such filter elements is provided.

Abstract: A filter arrangement for liquids has a filter housing and a functional carrier arranged inside the filter housing. A cylindrical filter element is inserted axially into the filter housing and defines an unfiltered side and a filtered side inside the filter housing. A non-return diaphragm is arranged on the filter element within the filter housing, wherein the non-return diaphragm is connected to the functional carrier and held at an axial spacing against a stop of filter housing so as to effect an axial and/or radial sealing action of the unfiltered side relative to the filtered side of the filter arrangement.

Abstract: In a method for producing two or more filter bellows, a bellows with a filter medium with fold edges is provided, wherein the filter medium is running in a running direction. A cutting path is carried out in the bellows with the filter medium in a direction that, at least in some regions, is transverse relative to the fold edges such that the filter bellows are produced in parallel and the cutting path creates end edge faces and/or side faces of the filter bellows and the filter bellows are embodied lying adjacent to each other and symmetrical or point-symmetrical relative to each other in the running direction and/or transverse to the running direction. A filter element with such a filter bellows and a filter system with such a filter element and filter bellows arranged in a filter housing are provided.

Abstract: A filter arrangement for liquids has a filter housing and a functional carrier arranged inside the filter housing. A cylindrical filter element is inserted axially into the filter housing and defines an unfiltered side and a filtered side inside the filter housing. A non-return diaphragm is secured within the filter housing, wherein the non-return diaphragm is arranged on the functional carrier so as to effect an axial and/or radial sealing action of the unfiltered side relative to the filtered side of the filter arrangement.

Abstract: An air filter element (200) for insertion into an air filter housing, comprising an intake surface (275), a discharge surface (285), a filter medium (210), and a filter element-retaining device (240) which extends along at least a section of the periphery of the filter medium (210), between the intake surface (275) and the discharge surface (285), and which includes a retaining arrangement (270) that radially projects from the filter medium (210).

Abstract: A filter insert for a filter for filtering a fluid having] an inflow surface, and outflow surface, and a main throughflow direction. A filter body of the insert has a filter medium with pleats forming a pleated bellows, are arranged perpendicular to the main throughflow direction. A first number of the pleat edges form the outflow surface and a second number of the pleat edges on a pre-filtration side of the filtration body form the outflow surface. A first seal prevents the fluid from overflowing from the pre-filtration side to the post-filtration on a surface formed by a first number of of end face of the pleats. A second seal prevents the fluid from overflowing from the pre-filtration side to the post-filtration side on a surface formed by a second number of end faces of the pleats.

Abstract: A filter element for fluids, including: a filter bellows made of a filter medium, the filter medium placed in the filter bellows along pleated edges in a zig-zag shape, in pleats that extend between opposite end edges of the filter bellows; wherein an end pleat having a pleated edge and an opposite free end margin is arranged on each opposite end face of the filter bellows, pleated edges that are consecutive along an end edge of a pleat end at opposite surfaces of the filter bellows; wherein a segment of one of the end edges extends obliquely to one of the pleated edges in such a manner that, in the one segment, the pleated edges on a first one of the opposite surfaces have a different length than the pleated edges of an opposite one of the opposite surfaces; and wherein the pleats are laterally sealed by the end edges.

Abstract: A filter bellows with zigzag-folded filter medium has first and second fold edges extending between opposite end edge faces of the filter medium. The filter bellows has opposite end faces with an end fold. The filter bellows in use has a raw fluid-side surface and a clean fluid-side surface. First fold edges are positioned at the raw fluid-side surface and second fold edges are positioned at the clean fluid-side surface. The filter bellows has a passage extending between raw fluid-side surface and clean fluid-side surface. The passage has a first opening at the raw fluid-side surface provided with a first cross section and a second opening at the clean fluid-side surface provided with a second cross section. When projecting the first and second openings onto each other, one cross section, at least with sections thereof, is arranged outside of the other cross section.

Abstract: In a method for producing two or more filter bellows, a bellows with a filter medium with fold edges is provided, wherein the filter medium is running in a running direction. A cutting path is carried out in the bellows with the filter medium in a direction that, at least in some regions, is transverse relative to the fold edges such that the filter bellows are produced in parallel and the cutting path creates end edge faces and/or side faces of the filter bellows and the filter bellows are embodied lying adjacent to each other and symmetrical or point-symmetrical relative to each other in the running direction and/or transverse to the running direction. A filter element with such a filter bellows and a filter system with such a filter element and filter bellows arranged in a filter housing are provided.

Abstract: A filtering system (9) includes a filter head (12) and a replaceable filter (10). The filter head (12) has a feed line (66) and discharge line (62). The replaceable filter (10) is removable and replaceably mounted onto the filter head (12) by a rotational and/or plug connection (15) and includes a housing (17) with at least one inlet (26) for oil to be filtered and at least one outlet (28). The inlet (26) communicates with the feed line (66). The outlet (28) communicates with the discharge line (62). The housing (17) has a filtering element (34) that sealingly separates the inlet (26) from the outlet (28). The filter head (12) includes an auxiliary oil line (60). The replaceable filter (10) has a flow control element (53) that automatically closes or releases the auxiliary oil line (60) dependent on an operation and/or assembly condition.

Abstract: Disclosed is an air filter element (200) for insertion into an air filter housing, comprising an intake surface (275), a discharge surface (285), a filter medium (210), and a filter element-retaining device (240) which extends along at least a section of the periphery of the filter medium (210), between the intake surface (275) and the discharge surface (285), and which includes a retaining arrangement (270) that radially projects from the filter medium (210).

Abstract: An air filter element (200) for insertion into an air filter housing, comprising an intake surface (275), a discharge surface (285), a filter medium (210), and a filter element-retaining device (240) which extends along at least a section of the periphery of the filter medium (210), between the intake surface (275) and the discharge surface (285), and which includes a retaining arrangement (270) that radially projects from the filter medium (210).

Abstract: A filter insert for a filter for filtering a fluid having] an inflow surface, and outflow surface, and a main throughflow direction. A filter body of the insert has a filter medium with pleats forming a pleated bellows, are arranged perpendicular to the main throughflow direction. A first number of the pleat edges form the outflow surface and a second number of the pleat edges on a pre-filtration side of the filtration body form the outflow surface. A first seal prevents the fluid from overflowing from the pre-filtration side to the post-filtration on a surface formed by a first number of of end face of the pleats. A second seal prevents the fluid from overflowing from the pre-filtration side to the post-filtration side on a surface formed by a second number of end faces of the pleats.

Abstract: A filter device has, in a housing, a filter element and, downstream of the filter element, an outflow opening for discharging the cleaned medium. Between the filter element and the outflow opening there is arranged a diverting part, wherein on the diverting part there is formed an overflow region for the flow of the medium from the filter element to the outflow opening, and the outflow opening is situated at the same level as or below the overflow region.

Abstract: Disclosed is an air filter element (200) for insertion into an air filter housing, comprising an intake surface (275), a discharge surface (285), a filter medium (210), and a filter element-retaining device (240) which extends along at least a section of the periphery of the filter medium (210), between the intake surface (275) and the discharge surface (285), and which includes a retaining arrangement (270) that radially projects from the filter medium (210).

Abstract: Disclosed is an air filter element (200) for insertion into an air filter housing, comprising an intake surface (275), a discharge surface (285), a filter medium (210), and a filter element-retaining device (240) which extends along at least a section of the periphery of the filter medium (210), between the intake surface (275) and the discharge surface (285), and which includes a retaining arrangement (270) that radially projects from the filter medium (210).

Abstract: A filter element for fluids, including: a filter bellows made of a filter medium, the filter medium placed in the filter bellows along pleated edges in a zig-zag shape, in pleats that extend between opposite end edges of the filter bellows; wherein an end pleat having a pleated edge and an opposite free end margin is arranged on each opposite end face of the filter bellows, pleated edges that are consecutive along an end edge of a pleat end at opposite surfaces of the filter bellows; wherein a segment of one of the end edges extends obliquely to one of the pleated edges in such a manner that, in the one segment, the pleated edges on a first one of the opposite surfaces have a different length than the pleated edges of an opposite one of the opposite surfaces; and wherein the pleats are laterally sealed by the end edges.