FILTER ELEMENT, HOUSING DESIGNED FOR A FILTRATION SYSTEM, AND FILTRATION SYSTEM EQUIPPED WITH A FILTER ELEMENT AND A HOUSING

Description

Technical field

[0001] The invention relates to a filter element and a filter system, in particular an air filter system, with a filter element and a housing. State of the art

[0002] The intake air of internal combustion engines is typically cleaned of contaminants by an air filter before entering the combustion chamber. Air filter elements used for this purpose may have a star-shaped pleated filter medium that surrounds a longitudinal axis in a ring. For internal combustion engines of commercial vehicles, such as heavy trucks, such a filter element may be more than 300 mm long, and in particular more than 500 mm long. The filter elements must be securely fastened in their filter housing. Since filter media become clogged with particles filtered out of the air during operation, regular replacement of the filter elements is necessary.

[0003] EP 2 535 550 A2 shows a ring filter element with a connecting region. WO 2018 / 073198 A1 shows a round filter element with a positioning element. WO 2011 / 045220 A2 discloses a filter insert comprising a filter element with a frame running along the side surfaces of the filter element, wherein the frame carries an axial seal. The seal is in contact with a sealing surface of a filter housing. The frame has a first and a second contact surface on two opposite side surfaces of the filter insert for clamping the filter element by means of a first and a second clamping element. The filter insert can be inserted into the filter housing through a lateral mounting opening. The clamping elements can be designed as clamping bars on a cover for closing the mounting opening. Disclosure of the invention

[0004] One object of the invention is to create a filter element that allows easy replacement even in confined spaces.

[0005] Another object of the invention is to provide a filter system that allows easy replacement of the filter element.

[0006] A further object of the invention is to provide a housing for such a filter system which enables easy replacement and correct installation of the filter element.

[0007] The above object is achieved according to one aspect of the invention by a filter element for filtering a fluid having the features of claim 1.

[0008] A further object is achieved according to one aspect of the invention by a filter system having the features of claim 11.

[0009] Advantageous embodiments and advantages of the invention emerge from the further claims, the description and the drawing.

[0010] A filter element for filtering a fluid, in particular a gaseous fluid, is proposed, having a longitudinal axis and comprising a filter bellows arranged around the longitudinal axis and enclosing an interior space. The filter element has a first end and an opposite second end, with an end plate open to the interior space at the first end and a closed end plate at the opposite second end. The filter bellows has folds whose radially outer fold edges lie in its outer lateral surface. The filter bellows has, at least on one of its end ends, a notch whose axial length in the direction of the longitudinal axis is shorter than a longitudinal extent of the filter bellows in the direction of the longitudinal axis.

[0011] Advantageously, the filter element can be installed in the correct position thanks to the at least one notch. The at least one notch clearly specifies the positioning of the filter element. The filter surface remains virtually unchanged despite the at least one notch. The filter element is preferably intended for filtering a gaseous fluid, preferably for filtering air.

[0012] According to the invention, the at least one notch begins at the end plate and extends longitudinally away from the end plate. This allows for several variants for producing the at least one notch, for example, during the production of the end plate.

[0013] According to a favorable design of the filter element, the filter bellows can have at least two notches. Advantageously, the two notches can be arranged at different ends of the filter bellows. Furthermore, the two notches can be offset from one another on the outer surface of the filter bellows. Thus, counter-contours can be provided on the housing side in a cover and a housing pot, allowing easy assembly of the filter element. For example, the two notches can be offset by 180° or at a different angle.

[0014] With a favorable design of the filter element, the pleats can be seamless in the area around the notch and / or within the notch. Advantageously, the pleats in the notch area are continuous, as in the rest of the filter bellows.

[0015] According to a favorable design of the filter element, the at least one notch can be formed as a widening between two folds in the radial and / or axial direction. The formation of the notch can be carried out in a way that is gentle on the filter bellows.

[0016] According to a favorable embodiment of the filter element, the at least one notch can be formed by a notch structure in a tool during the production of an end plate of the filter element. Advantageously, a casting shell can have a notch structure.

[0017] According to a favorable embodiment of the filter element, the at least one notch can be formed by a notch structure on a support tube of the filter bellows. The at least one notch can be produced when attaching the filter bellows to the support tube.

[0018] According to a favorable embodiment of the filter element, the at least one notch can be formed by a notch structure of an insert in the end plate of the filter bellows. The insert can be simply embedded into the end plate during formation and connected to the filter bellows.

[0019] According to a favorable design of the filter element, the pleats can be held at least partially by fixing elements at a constant, in particular equidistant, distance from one another. The filter element can be manufactured largely using conventional manufacturing methods.

[0020] According to a further aspect of the invention, a filter system is proposed comprising a housing with a fluid inlet and a fluid outlet and a replaceable filter element arranged in the housing. The filter element is intended for filtering a fluid, in particular a gaseous fluid, and has a longitudinal axis, comprising a filter bellows arranged around the longitudinal axis, which encloses an interior space, with a first end and an opposite second end, with an end plate open to the interior space at the first end and a closed end plate at the opposite second end. The filter bellows has folds whose radially outer fold edges lie in its outer lateral surface.The filter bellows has at least one of its front ends a notch whose axial length in the direction of the longitudinal axis is shorter than a longitudinal extension of the filter bellows in the direction of the longitudinal axis and wherein the notch interacts with a counter element of the housing.

[0021] Advantageously, the filter element can be held in place by friction via the corresponding notch, particularly when inserting the filter element into the housing. When inserting the filter element into the housing, the frictional engagement can counteract tilting of the filter element, for example, when the filter element is positioned at an angle or horizontally. When operating the filter element with the housing closed, the frictional engagement can be eliminated.

[0022] The cover can fix the filter element in the filter housing. In particular, the filter element can be clamped in the axial direction between a base of the filter housing and the cover. Conveniently, the force flow of an axial holding force for the filter element runs through a central tube of the filter element, as described above. The first end plate and a second end plate of the filter element can establish elastic deformability in the longitudinal direction of the filter element in order to maintain a defined holding force in the axial direction and to allow the cover to be closed completely. In the radial direction, the filter element can be supported in a form-fitting manner on the filter bowl and / or on the cover.

[0023] The filter system is preferably designed for filtering a gaseous fluid, preferably for filtering air. The filter system is preferably designed for installation in a vehicle, in particular in a commercial vehicle, preferably in a heavy commercial vehicle.

[0024] Depending on the filter system's design, the inlet and outlet can be located on the same housing part.

[0025] This allows for a very compact design of the filter system. A clean fluid channel can be conveniently located in a housing cover. This allows the filter system to be installed even in confined spaces, particularly in commercial vehicles.

[0026] A housing for a filter system is also proposed, in which at least one counter element, in particular a corresponding notch, is provided on a housing part, which cooperates with a notch on the filter element.

[0027] Advantageously, a filter element can be correctly positioned in the housing at an angle or lying down and protected from tipping. This is particularly advantageous for large filter elements, such as those used in commercial vehicles, which are heavy when loaded. Advantageously, the housing in a compact design can have an inlet and outlet on the same housing section. Furthermore, a clean fluid channel can be provided in the cover of the housing, so that the cover can be arranged on the clean side of the filter system. This can be advantageous in confined spaces in commercial vehicles. Short description of the drawings

[0028] Further advantages will become apparent from the following description of the drawings. The drawings illustrate exemplary embodiments of the invention. The drawings, description, and claims contain numerous features in combination. Those skilled in the art will conveniently consider the features individually and combine them into useful further combinations. Examples include: Fig. 1 shows a filter element according to a first embodiment of the invention with expanded folds at one end of the filter element; Fig. 2 shows the filter element according to Figure 1 with expanded folds at the opposite end of the filter element; Fig. 3 a plan view of a closed end plate of the filter element according to Figure 1 ; Fig. 4 a detail of the filter element according to Figure 1 at its closed end plate; Fig. 5 a detail of the filter element according to Figure 1 at its open end plate; Fig. 6 a longitudinal section through the filter element according to Figure 1; Fig. 7 a longitudinal section through a filter system with a housing into which a filter element according to Figure 1 is inserted; Fig. 8 a plan view of the filter system according to Figure 7 ; Fig. 9 a detail of the filter system according to Figure 7 at its closed end plate; Fig. 10 a detail of the filter system according to Figure 7 at its open end plate; Fig. 11 an isometric view of the filter system according to Figure 7 from a first side; Fig. 12 an isometric view of the filter system according to Figure 7 from a second side opposite the first side; Fig. 13 an exploded view of the filter system according to Figure 7 ; Fig. 14 a filter element according to a further example of the invention with a ring for locally widening the distances between folds of the bellows before applying the end plate; Fig. 15 the filter element according to Figure 14 with foamed end plate; Fig. 16 a longitudinal section through the filter element according to Figure 14; Fig. 17 a top view of the filter element according to Figure 14 ; Fig. 18 a detail of the filter element according to Figure 14 on an end plate; Fig. 19 a plan view of a ring for a filter element according to Figure 14 ; Fig. 20 an isometric view of the ring according to Figure 19 ; Fig. 21 a filter element according to a further example of the invention with a support tube for locally widening the distances between folds of the bellows; Fig. 22 a longitudinal section through the filter element according to Figure 21 ; Fig. 23 a top view of the filter element according to Figure 21 ; Fig. 24 a detail of the filter element according to Figure 21 on an end plate; Fig. 25 a longitudinal section through a support tube for the filter element according to Figure 21 ; Fig. 26 an isometric view of the support tube according to Figure 25 ; Fig. 27 a top view of the support tube according to Figure 25 ; Fig. 28 a detail of the support tube according to Figure 25; Fig. 29 a longitudinal section through a filter element according to an embodiment of the invention; Fig. 30 a detail of the filter element according to Figure 29 at its open end plate; Fig. 31 another detail of the filter element according to Figure 29 at its open end plate; Fig. 32 a perspective view of the filter element from Figure 29 seen from its open end plate; Fig. 33 a perspective view of the filter element according to Figure 29 seen from its closed end plate; Fig. 34 a support tube for a filter element according to Figure 29 ; Fig. 35 a casting shell for foaming a closed end plate for a filter element according to Figure 29 ; Fig. 36 a casting shell for foaming an open end plate for a filter element according to Figure 29; Fig. 37 a flow diagram of a method for producing a filter element according to an embodiment of the invention; Fig. 38 an exploded view of a filter system according to an embodiment of the invention with the filter element according to Figure 29 ; Fig. 39 a longitudinal section through the filter system according to Figure 38 ; Fig. 40 a longitudinal section through a detail of the filter system according to Figure 38 with assembly aids; Fig. 41 a perspective view of the filter system according to Figure 38 with an opened housing with an inserted filter element according to Figure 29 ; Fig. 42 a perspective view of the housing of the filter system according to Figure 38 ; Fig. 43 a cross-section through the filter system according to Figure 38 with inserted filter element after Figure 29 ; Fig. 44 a perspective view of the filter system according to Figure 38 with an opened housing with an inserted filter element according to Figure 29under a different angle; Fig. 45 a perspective view of the interior of the housing of the filter system according to Figure 38 with knobs; Fig. 46 the filter element according to Figure 29 when inserted into the housing of the filter system Figure 38 ; Fig. 47 an isometric view of an outer side of a cover of the housing of the filter system according to Figure 38 ; Fig. 48 an isometric view of an inside of a cover of the housing of the filter system according to Figure 38 ; Fig. 49 a detail of the longitudinal section through the filter system according to Figure 39 on its clean side with closed lid; Fig. 50 a longitudinal section through a detail of the section according to Figure 39 ; Fig. 51 a filter system according to a further embodiment of the invention with cover and seal in an expanded view; Fig. 52 an exploded view of the seal and cover of the filter system according to Figure 51 ; Fig. 53 a perspective view of the assembly of cover and seal according to Figure 52 ; Fig. 54 a side view of the filter system according to Figure 51 ; Fig. 55 a longitudinal section through the filter system according to Figure 51 ; Fig. 56 a section through a detail of a clean fluid connection of the cover of the filter system according to Figure 51 ; Fig. 57 a section through a detail of a raw fluid side of the cover of the filter system according to Figure 51 . Embodiments of the invention

[0029] In the figures, identical or similar components are designated by the same reference numerals. The figures are merely examples and are not to be construed as limiting.

[0030] The Figures 1 to 13 illustrate a first embodiment of the invention with a filter element 10 ( Figures 1-6 ) and a filter housing 102 and filter system 100 ( Figures 7 to 13 ).

[0031] Like the Figures 1 and 2As can be seen, the filter element 10 has a filter bellows 12 which extends along a longitudinal axis L and surrounds an interior space 50.

[0032] The filter bellows 12 is formed, for example, from a folded filter material that forms a self-contained filter bellows 12 and is arranged on a support tube 70. The support tube 70 may have an inwardly facing rib.

[0033] The folds 14 are in the Figures 1 and 2 only indicated by way of example and extend over the entire length of the filter bellows 12. The longitudinal edges 16 of the folds 14 lie in an outer surface 18 of the filter bellows 12. The filter bellows 12 is designed as a round element in this example.

[0034] End plates 22, 32 are arranged at a first end 20 and an opposite second end 30 of the filter element 10, sealing the filter bellows 12 at its end edges. The end plates 22, 32 can be formed in a conventional manner, for example, from foamed polyurethane.

[0035] At the first end 20, an end plate 22 is arranged, open toward the interior space 50. At the opposite second end 30, a closed end plate 32 is arranged. The closed end plate 32 has outwardly projecting circular segment-like spacer studs 34 that surround a mandrel 60 pointing into the interior space 50 at a constant radius. The spacer studs 34 can serve to support the filter element 10 in a housing.

[0036] The open end plate 22 has an outwardly facing ring 26 surrounding the opening 24 in the end plate 22. The ring 26 can serve as a seal. Preferably, the end plate 22 and the ring 26 are formed integrally. In particular, the end plate and the ring 26 can be formed from polyurethane.

[0037] The flow direction of the fluid to be filtered is through the filter bellows 12. If the clean side of the filter bellows 12 is provided on the inside, the fluid flows from the outside of the filter bellows 12 into the interior space 50 and from there out of the filter element 10 through the opening 24. Optionally, the flow direction can also be reversed.

[0038] The filter bellows 12 has a notch 40, 44 at each of its ends 20, 30, the axial length 42, 46 of which in the direction of the longitudinal axis L is shorter than the longitudinal extent of the filter bellows 12 in the direction of the longitudinal axis L. The notches 40, 44 are locally limited and do not extend over the entire length of the bellows 12. According to the invention, the notches 40, 44 have the greatest pleat edge spacing at the respective end plates 22, 32 and taper with increasing distance from the end plate 22, 32.

[0039] The notches 40, 44 widen the distance between two adjacent folds, the folds 14 extending over the entire length of the bellows 12.

[0040] Preferably, the notches 40, 44 are arranged offset on the circumference, for example offset by 180° on diametrically opposite sides of the bellows 12. The notches can also be offset from one another by angles other than 180°.

[0041] Fixing elements 90 can be provided between the notches 40, 44, ensuring that the distance between the folds 14 is kept constant in this area. Optionally, conventional fixing elements 90 such as thread winding, glue beads, beads of hot melt adhesive, embossing ("pleatlock") transverse to the longitudinal edges 16 of the folds 14, and the like can be provided.

[0042] The notches 40, 44 can be created in different ways. They can be introduced into the filter bellows 12 after the optional fixing elements 90 have already been attached. The notches 40, 44 can be introduced into the filter bellows 12 during the manufacture of the end plates 22, 32 or by inserts or expansion elements on the support tube and the like. The two notches 40, 44 on the filter bellows 12 can be formed in the same way or using different methods.

[0043] It can optionally be provided that only one notch 40 or 44 is present on the filter element 10.

[0044] As in the Figures 3 to 6 As can be seen, the notches 40, 44 originate from a notch in the end plates 22, 32. Figure 3 shows a plan view of the closed end plate 32 of the filter element 10 according to Figure 1 , Figure 4 a detail of the filter element 10 at its closed end plate 32 and Figure 5 a detail of the filter element 10 at its open end plate 22. Figure 6 shows a longitudinal section through the filter element 10 according to Figure 1 .

[0045] The notch can advantageously cause a frictional engagement against a counter element in a housing 102 during assembly of the filter element 10 and reduce the risk of the filter element 10 tilting during installation in the housing 102.

[0046] The notches 40, 44 are held in shape by the material of the end plate 22, 32.

[0047] It is possible for the end plate 22, 32 to have a slight projection in the notch relative to the folds spread by the respective notch 40, 44. This allows the notches 40, 44 to be compressed during installation into a housing part that has a counter-contour corresponding to the notches 40, 44.

[0048] Optionally, only one of the end plates 22, 32 can have a notch if notches 40, 44 are provided in the area of the filter bellows 12 adjacent to the end plates 22, 32. This allows the edge of the notchless end plate to be used for radial sealing.

[0049] In this embodiment, the closed end plate 32 has an inwardly curved surface, in the center of which the mandrel 60 projecting into the interior 50 is arranged.

[0050] The notches 40, 44 allow the filter element 10 to be installed in the correct position in a housing. In conjunction with the mandrel 60, this ensures stable positioning of the filter element 10. This is particularly advantageous when the filter element 10 is installed in a horizontal housing. The notches 40, 44 and the mandrel 60 prevent the filter element 10 from tilting.

[0051] The filter system 100 with housing 102 is in the Figures 7 to 13 shown. Figure 7 a longitudinal section through the filter system 100 with housing 102, into which a filter element 10 according to Figure 1 is used. Figure 8 shows a top view of the filter system 100, and the Figures 9 and 10 show details of the filter system 100 at the closed end plate 32 and at the open end plate 22 of the filter element 10. Figure 11 shows an isometric view of the filter system 100 from a first side, and Figure 12shows an isometric view of the filter system 100 from a second side opposite the first side. Figure 13 shows an exploded view of the filter system 100.

[0052] The housing 102 consists of a first housing part 104, for example, a housing cup, and a second housing part 106, for example, a cover. The two housing parts 104, 106 are connected to each other, in particular detachably, at a connection 105. The second housing part 106 has an inwardly curved surface on its end face, which corresponds to the curved end face of the closed end plate 32 of the filter element 10.

[0053] The housing 102 has a corresponding notch 120, 122 matching the notches 40, 44 of the filter element 10 on its first, open end plate 22 and its second, closed end plate 32. This is shown in the plan view of the housing 102 in Figure 8The notch 122 is provided in the housing 102 corresponding to the notch 44 at the end 30 with the closed end plate 32.

[0054] The housing 102 has a first fluid connection 110, for example, an air inlet, and a second fluid connection 112, for example, an air outlet. The first fluid connection 110 is arranged tangentially on the first housing part 104 of the housing 102, so that the fluid can enter the housing 102, for example, tangentially. The second fluid connection 112 is formed as a central nozzle 114 on the first housing part 104, which extends in the longitudinal direction L away from the filter element 10.

[0055] How Figure 9shows, the spacer knobs 34 of the closed end plate 32 rest on the inside of the second housing part 106 and allow secure clamping of the filter element 10 in the axial direction when the housing 102 is closed. This allows an improvement in stability in the event of vibrations during operation of the filter element 10. The notch 122 engages at least partially in the notch 44 of the filter element 10.

[0056] The open end plate 22 of the filter element 10 encompasses with the ring 26 an edge of the nozzle 114 projecting into the interior 50 and seals radially inwards against the edge, as in Figure 10 can be seen. The notch 120 engages at least partially into the notch 40 of the filter element 10.

[0057] In the Figures 11 and 12 the side views of the filter system 100 can be seen, which show the diametrically opposite position of the notches 120, 122 in the first and second housing parts 104, 106.

[0058] The exploded view in Figure 13 shows the components housing top 104, filter element 10 and housing cover 106 of the filter system 100. The filter element 10 can be inserted into the housing 102 in a position-oriented manner through the notches 40, 44 and the notches 120, 122 in the housing 102.

[0059] The Figures 14 to 20 show a further embodiment of the invention with a first manufacturing option for one or more notches 40 in a filter element 10. In this variant, the notch 40 in the filter bellows 12 of the filter element 10 is created by an insert 250 having a notch structure 252 that engages in the filter bellows 12 between two folds and spreads them open. The insert ring 250 can, for example, be placed in a casting mold during the production of the foamed, for example open, end plates 22 and thus connected to the end plate 22 and the filter bellows 12.

[0060] The other elements of the filter element 10 correspond to those of the previous embodiment of the Figures 1 to 13 , to which reference is made to avoid unnecessary repetition.

[0061] Figure 14 shows the filter element 10 according to a further example of the invention with a ring 250 for locally widening a distance between folds 14 of the bellows 12 before applying the end plate 22. Figure 15 shows the filter element 10 with foamed end plate 22 and embedded insert ring 250. Figure 16 shows a longitudinal section through the filter element 10 with the insert ring 250 in the open end plate 22. Figure 17 shows a plan view of the open end plate 22 of the filter element 10, and Figure 18 shows a detail of the filter element 10 in the connection area of the end plate 22, filter bellows 12 and insert ring 250.

[0062] The filter bellows 12 is arranged on a support tube 70. The support tube 70 may have an inwardly facing rib.

[0063] The Figures 19 and 20 show various views of the insert ring 250. The notched structure 252 protrudes axially from the annular surface of the insert ring 250. In the radial direction, the notched structure 252 has virtually no projection relative to the annular surface. In this way, the notched structure 252 can grip between two folds 14 and press them apart.

[0064] The notch structure 252 is approximately wedge-shaped and includes two curved, interconnected wings 251 that extend symmetrically outward from their contact surface. The cross-section through the interconnected wings 251 is approximately V-shaped and approximately wedge-shaped, with the two wings 251 of the notch structure 252 meeting at the center of the wedge shape.

[0065] The front edge of the notched structure 252 is straight and runs parallel to the longitudinal edges 16 of the folds 14 and is aligned with the longitudinal edges 16 of the folds 14. The rear side of the notched structure 252 is rounded by the rounding of the wings 251 and tapers to a point toward the outside. The rounded connecting seam and surface of the wings 251 allow the folds 14 in the filter bellows 12 to be gently expanded.

[0066] The Figures 21 to 28 show a further variant for producing at least one notch 44 in the bellows 12 of a filter element 10, in which a notch structure 72 is provided on the support tube 70 of the filter element 10. The support tube 70 can have an inwardly facing rib.

[0067] Figure 21 shows the filter element 10 with the support tube 70, which is designed for the local widening of distances between folds 14 of the bellows 12. Figure 22 shows a longitudinal section and Figure 23 a top view of the filter element 10. Figure 24 shows a detail of the filter element 10 at its closed end plate 32. Figure 25 shows a longitudinal section and Figure 26 an isometric view of the support tube 70. Figure 27 shows a top view of the support tube 70 and Figure 28 a detail of the support tube 70.

[0068] The other elements of the filter element 10 correspond to those of the embodiment of the Figures 1 to 13 , to which reference is made to avoid unnecessary repetition.

[0069] Like the Figures 21 and 22 As can be seen, the notch 44 in the filter bellows 12 at the closed end plate 32 of the filter element 10 is caused by a notch structure 72 of the support tube 70. Generally, the support tube 70 is closed at its closed end with a plate 74. In this example, the notch structure 72 is arranged at the closed end of the support tube 70.

[0070] The notched structure 72 of the support tube 70 engages between two folds 14 and widens their mutual spacing radially outward. A notch is formed in the end plate 32 in the region of the notched structure 72.

[0071] The notch structure 72 protrudes radially from the support tube 70 corresponding to the thickness of the filter bellows 12 and projects axially into the filter bellows 12. The notch structure 72 is approximately wedge-shaped and comprises two curved, interconnected wings 71 that extend symmetrically outward from their contact surface.

[0072] The cross-section through the connected wings 71 is approximately V-shaped, with the two wings 71 of the notched structure 72 meeting in the center of the wedge shape. The wings 71 are slightly rounded so that the pleats 14 in the filter bellows 12 can be gently expanded.

[0073] The front edge of the notched structure 72 is straight and runs parallel to the longitudinal edges 16 of the pleats 14 and is aligned with the longitudinal edges 16 of the pleats 14. The rear side of the notched structure 72 is rounded by the curvature of the wings 71 and tapers to a point toward the outside. This allows the notched structure 72 to grip between two pleats 14 of the filter bellows 12 and push them apart. The rounded connecting seam and surface of the wings 71 allow the pleats 14 in the filter bellows 12 to be gently expanded.

[0074] Filter bellows 12 with support tube 70 and notch structure 72 are intimately connected to each other during casting of the end plate 32.

[0075] The Figures 29 to 33 show a filter element 10 according to a further embodiment of the invention with a variant of an open end plate 22.

[0076] Figure 29 shows a longitudinal section through the filter element 10, Figure 30shows a detail of the filter element 10 at the open end plate 22. Figure 31 shows a further detail of the filter element 10 at the open end plate 22. Figure 32 shows a perspective view of the filter element 10 seen from its open end plate 22. Figure 33 shows an isometric view of the filter element 10 seen from its closed end plate 32.

[0077] The filter element 10 has a filter bellows 12 that extends along a longitudinal axis L and surrounds an interior space 50. The filter bellows 12 is formed, for example, from a folded filter material that is arranged in a self-contained manner on a support tube 70.

[0078] The folds 14 of the filter bellows 12 extend over the entire length of the filter bellows 12. The longitudinal edges 16 of the folds 14 lie in an outer surface 18 of the filter bellows 12. In this example, the filter bellows 12 has a cross-section with two opposing circular arc-shaped sections that are connected by straight areas.

[0079] End plates 22, 32 are arranged at a first end 20 and a second end 30 of the filter element 10, which is opposite the first end along the longitudinal axis L. These end plates seal the filter bellows 12 at its end edges. The end plates 22, 32 can be formed in a conventional manner, for example, from foamed polyurethane.

[0080] At the first end 20, an end plate 22 is arranged, open toward the interior 50. At the opposite second end 30, a closed end plate 32 is arranged. The closed end plate 32 has outwardly projecting circular segment-like spacer studs 34 that surround a mandrel 60 pointing into the interior 50. The spacer studs 34 can serve to support the filter element 10 in the housing 102. The spacer studs 34 are preferably formed integrally with the end plate 32.

[0081] The open end plate 22 has an outwardly facing bead 28, which partially surrounds the opening 24 in the end plate 22. The bead 38 is preferably formed integrally with the end plate 22. The bead 28 has an approximately U-shaped form and extends approximately U-shaped around the opening 24 of the end plate 22, so that part of the opening 24 is surrounded by the bead 28 and part is bead-free. The bead 28 surrounds approximately three-quarters of the circumference of the central opening 24.

[0082] The bead-free area of the opening 24 of the end plate 22 preferably has a particularly rounded edge 29. Fluid can escape into a clean channel through the bead-free area of the opening 24.

[0083] The bead 28 can serve to support the filter element 10 in a housing. This is particularly advantageous in a housing in which the filter element 10 is installed horizontally, i.e., with the longitudinal axis L oriented obliquely or horizontally.

[0084] For manufacturing reasons, the first end plate 22 has impressions of spacers 218 of a casting mold 210 ( Figure 36 ), in which the first end plate 22 with the clean air seal 25 was cast onto the filter bellows 12. The first end plate 22 and the circumferential clean air seal 25 are made of polyurethane.

[0085] For manufacturing reasons, the second end plate 32 has, like the first end plate 22, an unspecified indentation which is formed by a spacer of a casting mold 200 ( Figure 35). The indentation of the second end plate 32 is largely continuous and is only interrupted in the area of the notch 44.

[0086] The flow direction of the fluid to be filtered is through the filter bellows 12. If the clean side of the filter bellows 12 is provided on the inside, the fluid flows from the outside of the filter bellows 12 into the interior space 50 and from there out of the filter element 10 through the opening 24. Optionally, the flow direction can also be reversed.

[0087] The filter bellows 12 has a notch 44 at its second end 30, the axial length 46 of which in the direction of the longitudinal axis L is shorter than the longitudinal extent of the filter bellows 12 in the direction of the longitudinal axis L. The notch 44 is locally limited and does not extend over the entire length of the bellows 12. Preferably, the notch 44 has the greatest pleat edge spacing at the end plate 32 and tapers with increasing distance from the end plate 32.

[0088] The notch 44 merely widens the distance between two adjacent folds 14, the folds 14 extending over the entire length of the bellows 12.

[0089] Between the notch 44 and the opposite open end plate 22, fixing elements 90 can be provided, which ensure that the distance between the pleats 14 is kept constant in this area. Optionally, conventional fixing elements 90 such as thread winding, glue beads, beads of hot melt adhesive, embossing ("pleatlock") transverse to the longitudinal edges 16 of the pleats 14, and the like can be provided.

[0090] The notch 44 can be created in different ways. It can be introduced into the filter bellows 12 after the optional fixing elements 90 have already been attached. The notch 44 can be introduced into the filter bellows 12 during the manufacture of the end plate 32.

[0091] It can optionally be provided that, as in the embodiment in the Figures 1 to 13 a notch 40, 44 is provided at each of the two ends 20, 30 of the filter element 10.

[0092] The open end plate 22 projects radially with a projection 23 over the filter bellows 12 and can be used as a radial seal 25 ( Figures 30, 31 ). The projection 23 is preferably at least 3 mm, preferably at least 5 mm, particularly preferably at least 6 mm, further preferably at least 8 mm, further preferably at least 10 mm, particularly preferably at least 8 mm and at most 15 mm.

[0093] On the side of the end plate 22 where the bead 28 is located, the projection 23 of the end plate 22 is smaller than on the diametrically opposite side. Optionally, however, the end plate 22 can also be designed with a constant projection 23 all around.

[0094] At the closed end plate 32, a hollow, approximately T-shaped mandrel 60 projects into the interior 50. The mandrel 60 can be used as an assembly aid when mounting the filter element 10 in a housing 102.

[0095] On the side of the end plate 32 opposite the notch 44, two circumferentially spaced cams 36 are arranged, which project radially beyond the end plate 32. These cams serve as an assembly aid, so that when the filter element 10 is inserted into its housing, the filter bellows 12 and the end plate 32 remain spaced from the housing wall.

[0096] The support tube 70 has an inwardly projecting rib 78 along its length, which can be used to position the support tube 70 in a casting shell for the end plates 22, 32.

[0097] At the closed end plate 32, a hollow mandrel 60 projects into the interior 50. The mandrel 60 can be used as an assembly aid when mounting the filter element 10 in a housing 100. This is particularly important in the Figures 39 to 46 which show the filter system 100 with the filter element 10 inserted into the housing 102.

[0098] Figure 34shows the support tube 70 for the filter element 10 with the inward-facing rib 78, which extends axially along the body 76 of the support tube 70. At one end, which will later be provided on the open end plate 22, the support tube 70 has a folded-over wide edge 80. The edge 80 serves as a support structure and is designed here in the region of the first end plate 22 in a grid-like manner with radial struts and circumferential rings, between which openings (not shown in more detail) are provided. The material of the end plate 22, for example polyurethane, can penetrate through the openings and thus completely embed the edge 80 in the end plate 22.

[0099] At the end that will later be provided on the closed end plate 32, the mandrel 60 can be seen in the center. The mandrel 60 can be made of a non-elastomeric material like the support tube 70. The support tube 70 is closed at this end with a plate 74, from which the mandrel 60 projects axially into the interior.

[0100] The Figure 35 shows a casting shell 200 for foaming a closed end plate 32 for the filter element 10 according to Figure 29 , and Figure 36 shows a casting bowl for foaming an open end plate 22 for the filter element according to Figure 29 . At the transition of the edge 80 to the body 76 of the support tube 70, recesses 75 are provided into which the material of the end plate 22 can engage.

[0101] In the casting shell 200 for the closed end plate 32, a mandrel contour 203 can be seen in the center, which is complementary to the mandrel 60 in the support tube 70 and onto which the support tube 70 can be attached. A notch structure 202 is provided to engage between two folds 14 of the filter bellows 12 arranged on the support tube 70 and to spread them open.

[0102] Two cam contours 204 are provided to create the cams 36. Recesses 206 are provided as a knob contour for the knobs 34. The knob contours 34 are surrounded by a circumferential groove 201, which is interrupted at the notch structure.

[0103] The casting shell 210 for the open end plate 22 comprises a bead contour 212, in which the bead 28 of the end plate 22 is formed, and a nozzle 216, which defines the opening 24 of the end plate 24. On the outside of the nozzle 216, a receptacle 214 is formed, which receives the inwardly projecting rib 78 of the support tube 70. Furthermore, elevations 218 are provided, which surround the nozzle 216 at a constant distance. The elements 218 engage the outwardly folded edge 80 of the support tube 70. Furthermore, small projections 220 are distributed on the nozzle 216, which engage in the recesses 75 of the support tube 70 for anchoring.

[0104] Via the support tube 70, both casting shells 200, 210 can be aligned to each other in a defined manner by placing the support tube 70 with the mandrel 60 on the mandrel contour 203 of the casting shell 200 of the closed end plate 22 and the

[0105] internal rib 78 is inserted into the receptacle 214 of the casting bowl 210 for the open end plate 22.

[0106] Figure 39 shows a flow chart of a process for producing a filter element 10 using the casting shells 200, 210.

[0107] In step S100, a support tube 70 is provided, on which a filter bellows 12 is arranged, with or without a notch 40, 44, and which has an inwardly facing axial rib 78. The support tube 70 has an open end and an axially opposite closed end, into which a mandrel 60 projects into the interior of the support tube 70. The end of the support tube 70 is closed with a disc 74.

[0108] In step S102, casting shells 200, 210 are provided for an open end plate 22 and a closed end plate 32.

[0109] In step S104, the starting material of the end plate 22, in particular liquid polyurethane, is poured into the casting shell 210.

[0110] In step S106, the support tube 70 is placed with its folded edge 80 into the pouring bowl 210 in the still liquid starting material for the open end plate 22, with the inwardly facing rib 78 being inserted into the recess 214 of the nozzle 216. The elevations 218 engage in openings on the edge 80 of the support tube 70. The liquid starting material foams around and encloses the edge 80 of the support tube 70 and the base of the filter bellows 12. After the reaction of the material is complete, the support tube 70 with the filter bellows 12 and the open end plate 22 is removed from the pouring bowl 210.

[0111] In step S108, the starting material of the end plate 32, in particular liquid polyurethane, is poured into the casting shell 200,

[0112] In step S110, the support tube 70 with the filter bellows 12 is placed in the casting shell 200 into the still liquid starting material for the closed end plate 32 and is correctly positioned on the mandrel contour 203 via the T-shaped mandrel 60. The notch structure 202 of the casting shell 200 engages between two folds of the filter bellows 12 and spreads them open.

[0113] The liquid starting material foams around and covers the closed side of the support tube 70 and encloses the base of the filter bellows 12. In the process, the spacer nubs 34 are formed on the closed end plate 32 in the recesses 206. Likewise, the notch 40 is fixed in the filter bellows 12. After the material has completed its reaction, the support tube 70 with the filter bellows 12 and the closed end plate 32 is removed from the casting shell 210.

[0114] The Figures 38 to 50show an embodiment of a filter system 100 according to an embodiment of the invention with a filter element 10, as described above in the Figures 29 to 33 was described.

[0115] Figure 38 shows an exploded view of a filter system 100 according to an embodiment of the invention with the filter element 10 according to Figure 29 inserted into a housing 102 with a housing part 104 which is closed with a cover 130. Figure 39 shows a longitudinal section through the filter system 100 and Figure 40 a longitudinal section through a detail of the filter system 100 with assembly aids in the area of the closed end plate 32 of the filter element 10. Figure 41 shows a perspective view of the filter system 100 with the housing 102 opened and the filter element 10 inserted, while Figure 42 shows the same view of the housing without filter element 10. Figure 43shows a cross-section through the filter system 100 with inserted filter element 100 and visible assembly aids in plan view.

[0116] The Figures 44 and 45 show perspective views of the opened housing 102 of the filter system 100. Figure 46 shows the filter element 10 Figure 29 when inserted into the housing 102 of the filter system 100. The Figures 47 and 48 show the cover 130 in detail. The Figures 49 and 50 show details in the area of the cover 130 on the housing part 104 in longitudinal section.

[0117] The housing 102 comprises the first housing part 104, for example a housing pot, and a second housing part in the form of a cover 130. At the open end of the housing part 104, a circumferential collar 109 is formed, which is provided with a sealing element 137 ( Figures 49 , 50 ) interacts.

[0118] The housing 102 has an inlet 110 and an outlet 112. The inlet 110 is provided directly adjacent to the outlet 112 on the first housing part 104, for example, arranged tangentially thereto.

[0119] Inlet 110 and outlet 112 of housing 102 are closely adjacent and arranged in the same housing part 104. The fluid to be filtered undergoes a directional deflection between inlet 110 and outlet 112, in particular a deflection of 180°.

[0120] As in the Figures 41 and 42 As can be seen, the second housing part 104 of the housing 102, when the filter element 10 is installed, has a valve 128 below the filter element 10, which serves to drain water from the housing 102. The valve 128 protrudes into the interior of the housing 102. It can also be seen that the inlet 110 and outlet 112 are arranged directly adjacent to each other on the same housing part 104.

[0121] Adjacent to the collar 109, a shoulder 107 is provided on the inside of the housing part 104, which runs between the housing-side openings for inlet 110 and outlet 112. The shoulder 107 forms a sealing surface for a seal 144 between the cover and the housing part 104 ( Figures 49 , 50 ).

[0122] The first housing part 104 has a mandrel 116 in its base portion corresponding to the mandrel 60. The corresponding mandrel 116 has a locking element 118 on the contact surface with the mandrel 60 of the filter element 10, which interacts with a locking element 62 on the inside of the hollow mandrel 60. When the filter element 10 is inserted into the housing part 104, the filter element 10 is thereby protected from tilting. When the cover 130 is connected to the housing part 104, the mandrel 60 is separated from the corresponding mandrel 116.

[0123] If the filter element 10 is inserted into the first housing part 104, the corresponding mandrel 116 catches the mandrel 60 of the filter element 10, so that the filter element 10 can be pushed into its final position in the correct position.

[0124] The cover 130 is then attached to the first housing part 104. In the assembled state of the filter element 10, a central longitudinal axis L of the filter element 10 coincides with a central longitudinal axis of the second housing part 104.

[0125] If the interior 50 of the filter element 10 is the clean side of the filter element 10, the cover 130 is arranged on the clean side of the housing 102. The cover 130 has a clean fluid channel 134 in its interior, which directs the filtered fluid, for example, clean air, to the outlet 122. For this purpose, a nozzle 142 is arranged on the first housing part 104, which provides the outlet 112. The nozzle 142 protrudes in the axial direction beyond the end plate 22 of the installed filter element 10.

[0126] The cover 130 has an opening 132 which, when the cover 130 is closed, is positioned below the nozzle 142 of the first housing part 104.

[0127] The bead 28 of the filter element 10 on the open end plate 22 rests against a corresponding receptacle of the cover 130 and, together with the seal 25 of the projection 23, forms a radial seal against the raw side of the filter element 10. The bead 28 serves to support the filter element 10.

[0128] Because only a part of the open end plate 22 has the bead 28, the bead-free area around the opening 24 to the outlet 112 is open, and the filtered fluid can flow through the cover 130 to the outlet 112.

[0129] The first housing part 104 further comprises a mandrel 116 corresponding to the mandrel 60, as shown in the Figures 44 and 45 can be seen. The corresponding mandrel 116 has a locking element 118 on the contact surface with the mandrel 60 of the filter element 10, which interacts with a locking element 62 on the inside of the hollow mandrel 60. The mandrel 60 determines the angle of the filter element 10 and prevents the filter element 10 from tipping over when the filter element 10 is inserted into the housing part 104.

[0130] If the filter element 10 is inserted into the first housing part 104, as in Figure 46As indicated, the corresponding pin 116 catches the pin 60 of the filter element 10, so that the filter element 10 can be pushed to its final position. At the same time, the cams 36 on the closed end plate 32 ensure that the filter bellows 12 can slide over the valve 128 at a safe distance.

[0131] Figure 47 shows an isometric view of an outer side of the lid 130, and Figure 48 shows an interior view of the cover 130. The cover 130 is wedge-shaped when viewed from the side, so that its edge 136 rises from a low-height region to an opposite high-height region. The opening 132 is located in the high-height region, which exposes the clean fluid channel 134 in the interior of the cover 130.

[0132] The opening 132 is positioned below the nozzle 142 when the cover 130 is closed. An air duct 134 is formed in the cover 130. The clean fluid channel 134 serves to direct the filtered air from the interior 50 of the filter element 10 to the outlet 112 of the housing 102. The clean fluid channel 134 here has two regions in the opening 132, which, in the assembled state, communicate with the outlet 112 in the side wall of the housing part 104.

[0133] The cover 130 has a circumferential sealing groove 141 that defines a first sealing plane. Radially within this sealing groove 141 is another circumferential sealing groove 140 that defines a second sealing plane. The opening 132 of the cover 130 lies between the two sealing planes. A separate seal for the opening 132 is therefore unnecessary.

[0134] As in the views of the Figures 49 and 50As can be seen in detail, the circumferential seal 144 is accommodated in the sealing groove 140. This seal is arranged between the cover 130 and the housing part 104 and serves to seal the raw side and the clean side. A circumferential seal 137 is accommodated in the sealing groove 141 to seal the clean side against the outside area of the filter system 100.

[0135] The open end plate 22 has a radial projection 23 ( Figures 30, 31 )), which acts as a radial seal 25 against a sealing area of the cover 130.

[0136] The sealing grooves 140, 141 surround a circumferential collar 139, the inner surface of which forms the sealing surface for the radial seal 25 of the open end plate 22.

[0137] When the cover 130 is closed, the bead 28 engages in a receptacle 138 of the cover 130, which extends inside the collar 139. This is shown in the detailed views of the Figures 49 and 50can be seen, in which the cover 130 is connected to the housing part 104. The receptacle 138 can cause axial clamping of the filter element 10 in the housing 102.

[0138] The cover 130 protrudes into the opening 24 of the end plate 22 in the area of the housing 102 near the valve 128 with a rib 148. The valve 128 is arranged below the filter element 10. The rib 148 prevents water from collecting in the clean area and directs the water back into the filter element 10, where it can drain through the valve 128.

[0139] The Figures 51 to 57 show a further embodiment of a filter system 100 according to a further embodiment of the invention.

[0140] This shows Figure 51shows an exploded view of a filter system 100 with a housing 102, which has a first housing part 104, for example a housing pot, and a second housing part in the form of a cover 130 and a one-piece seal 150 for sealing from the clean side to the raw side and against the outside of the filter system 100. Figure 52 shows an exploded view of the one-piece seal 150 and cover 130 of the filter system 100 according to Figure 51 , while Figure 53 a perspective view of the assembly of cover 130 and seal 150. Figure 54 shows a side view of the filter system 100 and Figure 55 a longitudinal section through the filter system 100. Figure 56 shows a section through a detail of a clean fluid connection of the cover 130 of the filter system 100 and Figure 57 a section through a detail of a raw fluid side of the cover 130 of the filter system 100.

[0141] The further components and details of filter system 100 and filter element 10 are described in the previous embodiments, in particular in the Figures 29 to 46 , which are referred to in order to avoid unnecessary repetition.

[0142] The filter element 10 has at least one axially limited notch 44 in its filter bellows 12, preferably on the side of its closed end plate 32. With the closed end plate 32 leading, the filter element 10 is inserted into the first housing part 104, where it can be pushed onto cams 36 via a valve 128 in the first housing part 104 below the filter element 10. The closed end plate 32 has a central, inwardly facing pin 60, which is pushed onto a pin 116 in the first housing part 104.

[0143] The open end plate 22 of the filter element 10 has a bead 28 that partially encloses the opening 24 of the end plate 22. In the bead-free area of the opening 24, fluid can flow from the interior 50 of the filter element 10 to the outlet 112 via a clean fluid channel 134 of the cover 130. Inlet 110 and outlet 112 are arranged directly adjacent in the same housing part 104.

[0144] The cover 130 has a wedge-shaped edge 136, in the region of which an opening 132 is arranged. When the cover 130 is closed, this opening is positioned below the nozzle 142 of the first housing part 104. The nozzle 142 protrudes axially beyond the end plate 22 of the installed filter element 10.

[0145] The cover 130 has a receptacle 138 for the bead 28. Notch 44, mandrel 60, and bead 28 secure the filter element 10 against tilting in the housing 102, which is advantageous when the filter element 10 is installed horizontally.

[0146] The one-piece seal 150 comprises a first sealing ring 152 and a sealing ring 154 connected to it on both sides via flanks 156 and angled thereto. The first sealing ring 152 bears against a sealing surface 146 on the outer edge of the inside of the cover 130, wherein the sealing surface 146 largely surrounds a collar 139, the inside of which serves as a sealing surface for the radial seal 25 of the end plate 22. An outer groove 149 is connected to the sealing surface 146 and receives an edge of the sealing ring 152.

[0147] The second sealing ring 154 rests against a sealing surface 147, which encloses the opening 132 in the edge 136 of the cover 130. The seal 150 rests with its flanks 156 at the two transitions between the two sealing surfaces 146, 147.

[0148] Advantageously, the one-piece seal 150 integrates both the seal between the raw and clean sides around the nozzle 142 of the outlet 112 and the seal to the environment all the way around the cover 130.

[0149] Furthermore, the cover 130 has, above the receptacle 138 for the bead 28, a rib 148 projecting into the housing 102 and the opening 24 of the open end plate 22, which rib serves to keep water out of the clean channel 134 of the cover 130 and to guide it through the filter element 10 to the valve 128.

[0150] As shown in the sectional view of the Figure 55 which the housing in Figure 54 shows, and the detailed representations in Figure 56 on the clean fluid side of the filter system 100 and in Figure 57As can be seen on the raw fluid side of the filter system 100, the seal 150 provides both the seal between the cover 130 and the outer area of the cover 130 and the raw fluid side. The seal between the clean fluid side and the raw fluid side is provided by the first sealing ring 152. The seal against the outer area is provided by the second sealing ring 154.

[0151] The first sealing ring 152 has an approximately Z-shaped profile, with one leg extending in opposite directions from a central leg at each of its ends. The second sealing ring 154 has an approximately T-shaped profile.

[0152] The first sealing ring 152 rests with a projecting leg in the groove 149, with the middle leg on the inside of the circumferential collar 109 of the housing part 104 and with the further projecting leg on the outside of the collar 139.

[0153] With the filter element 10 and filter system 100 according to the invention, a filter element 10, particularly one installed horizontally, can be securely mounted and disassembled. By means of one or more notches 40, 44 on the filter bellows 12 and mandrel 60, and optionally a bead 28, correct positioning can be achieved and the filter element 10 can be protected from tilting when installed horizontally.

[0154] It is understood that the embodiments described so far in the figures are not limited to a round cross-section of the filter element 10. Rather, the cross-section of the filter element 10 can be selected as required, for example, round, oval, square, and the like.

Claims

1. Filter element (10) for filtering a fluid, in particular a gaseous fluid, having a longitudinal axis (L), comprising a filter bellows (12) disposed around the longitudinal axis (L) and which encloses an interior space (50), having a first frontal end (20) and a second frontal end (30) opposite said first end (20), having an end disc (22) open towards the interior space (50) at the first end (20) and a closed end disc (32) at the opposite second end (30), wherein the filter bellows (12) features folds (14), the radially outer fold edges (16) of which lie in its outer circumferential surface (18), wherein the filter bellows (12) features, at least at one of its frontal end faces (20, 30), a notch (40, 44) whose axial length (42, 46) in the direction of the longitudinal axis (L) is shorter than a longitudinal extension of the filter bellows (12) in the direction of the longitudinal axis (L), wherein the at least one notch (40, 44) begins at the end disc (22, 32) and extends in the longitudinal direction (L) away from the end disc (22, 32), wherein the notch (40, 44) has the greatest fold edge distance at the end disc (22, 32) and tapers with increasing distance from the end disc.

2. Filter element according to claim 1, wherein the filter bellows (12) comprises at least two notches (40, 44).

3. Filter element according to claim 2, wherein the two notches (40, 44) are disposed at different ends (20, 30) of the filter bellows (12).

4. Filter element according to claim 2 or 3, wherein the two notches (40, 44) on the lateral surface (18) of the filter bellows (12) are offset in relation to each other.

5. Filter element according to one of the preceding claims, wherein the folds (14) in the area around the notch (40, 44) and / or in the notch (40, 44) are designed without interruption.

6. Filter element according to one of the preceding claims, wherein the at least one notch (40, 44) is formed as a widening between two folds (14) in radial and / or axial direction.

7. Filter element according to one of the preceding claims, wherein the at least one notch (40, 44) is formed by a notch structure (202) in a tool (200) when manufacturing the end disc (22, 32).

8. Filter element according to one of the preceding claims, wherein the at least one notch (40, 44) is formed by a notch structure (72) on a support tube (70) of the filter bellows (12).

9. Filter element according to one of the preceding claims, wherein the at least one notch (40, 44) is formed by a notch structure (212) of an insert (210) in the end disc (22, 32) of the filter bellows (12).

10. Filter element according to one of the preceding claims, wherein the folds (14) are held at least in some areas at a constant, in particular equidistant, distance from one another by fixing elements (90).

11. Filter system (100) having a housing (102) with a fluid inlet (110) and a fluid outlet (112) and an exchangeable filter element (10) disposed in the housing (102) according to one of the preceding claims, wherein the notch (40, 44) cooperates with a counterpart (120, 122) of the housing (102), in particular with a corresponding notch.

12. Filter system according to claim 11, wherein the inlet (110) and outlet (112) are located on the same housing component (104).

13. Filter system according to claim 11 or 12, wherein a clean fluid channel (134) is disposed in a cover (130) of the housing (102).

14. Filter system according to one of the claims 11 to 13, wherein the housing (102) features a mandrel (116) which cooperates with a corresponding mandrel (60) in the filter element (10) in the direction of the longitudinal axis (L), or wherein the housing (102) features a mandrel (116) which cooperates with a corresponding mandrel (60) in the filter element (10) in the direction of the longitudinal axis (L), and wherein the mandrel (116) features a latching element (118), in particular in the form of a latching lug and / or an undercut, which cooperates with a corresponding latching element (62) on the mandrel (60) of the filter element (10).