Filter arrangement and use of a filter element

Abstract

Filter arrangement (1) with a filter element (2) and with a filter housing (3) comprising a housing body (3a) which has an opening (5) into which the filter element (2) can be inserted in an insertion direction (6), and a housing cover (3b) for closing the opening (5) in the housing body (3a), wherein the housing cover (3b) has a recess (10) in which a section (11) of the filter element (2) projecting in the insertion direction (6) is received, wherein the section (11) projecting in the insertion direction (6) is designed as an extraction aid, characterized in that the projecting section (11) is formed by means of a part of a side band (9) and / or a part of a head band (8) of the filter element (2) and the recess (10) is configured to receive a projecting side band section (9) or head band section (8) of the filter element (2).

Description

Technical field

[0001] The present invention relates to a filter housing for a filter element. The invention further relates to a filter element for such a filter housing. The invention further relates to a filter arrangement comprising such a filter housing and such a filter element.

[0002] Although applicable to any filter housing, filter elements and filter arrangements, the present invention and the underlying problem are described below for a cabin air filter of a motor vehicle.

[0003] Increasing air pollution, particularly in large cities, combined with the use of modern air conditioning systems, necessitates the purification of the air drawn into the interior of a vehicle using suitable filters. Examples include particle filters, odor filters, or combinations thereof, designed to effectively filter out or absorb suspended particles, particulate matter, and odors from the ambient air.

[0004] Pleated filter materials, such as filter fleeces, are frequently used to filter air for the interior of a motor vehicle. This involves folding a flat sheet of filter material into a zigzag pattern. The pleated pack is held in place by side and top bands or another type of frame. These filter elements can be fixed in a replaceable position within a filter housing. The resulting filter assembly can then be installed in the air conditioning system of a vehicle.

[0005] To achieve optimal filter performance, using the correct filter type is crucial. Furthermore, it can be important that the filter elements are installed in a defined orientation, particularly with regard to the airflow direction. Elements on the filter element and / or filter housing that create a poka-yoke effect can ensure that the correct type and / or properly oriented filter element is used.

[0006] From DE 10 2007 048 395 A1, a cabin air filter for a heating or air conditioning system of a motor vehicle is known, comprising a holding arrangement with a plurality of holding elements, by means of which the cabin air filter can be positioned on a housing area of ​​a housing of the heating or air conditioning system, wherein the holding arrangement has a geometric anti-counterfeit feature by means of which the cabin air filter can be inserted into the housing of the heating or air conditioning system in a way that prevents confusion. Disclosure of the invention

[0007] Against this background, the present invention aims to create an improved filter housing, an improved filter element and an improved filter arrangement.

[0008] This problem is solved by a housing for a filter element with a housing body which has an opening into which the filter element can be inserted in an insertion direction, and a housing cover for closing the opening in the housing body, wherein the housing body or the housing cover has a recess in which a section of the filter element projecting in the insertion direction can be received.

[0009] By allowing a portion of the filter element protruding in the insertion direction to be accommodated in the recess, a simple Poka-Yoke function can be provided, particularly with regard to the filter type and / or the orientation of the filter element within the housing. For example, if the filter element is inserted into the housing body in such a way that the protruding portion can be accommodated in the recess, the housing cover can be connected to the housing body. Conversely, if the filter element is inserted into the housing body in such a way that the protruding portion cannot be accommodated in the recess, the housing cover cannot be connected to the housing body, for example, because there is a gap between the housing body and the housing cover.In other words, the recess and the section of the filter element that protrudes in the insertion direction can ensure that, for example, a filter element of the correct type or in a defined orientation is inserted into an opening of a housing body before the opening is closed, in particular with a housing cover, or that it becomes obvious when the opening is closed that the filter element is not of the correct type and / or is not inserted in the defined orientation.

[0010] In particular, the housing body and the housing cover can be parts made of injection-molded plastic. Manufacturing injection-molded plastic components typically requires an injection mold, which is generally custom-made for each individual component. Depending on the size and shape of the component to be manufactured, producing the corresponding injection mold can be complex and expensive. It can therefore be advantageous to incorporate the recess into a housing part whose mold is relatively easy to modify. For example, a housing cover for closing an opening in a housing body can be a smaller and simpler component compared to the housing body itself. Specifically, the housing cover can be manufactured using a simple open-close mold. Furthermore, an injection mold for the housing cover, being a smaller and / or simpler component, can be modified more easily and cost-effectively.This can also have the advantage that a recess can be more easily retrofitted to a housing cover. This also allows existing filter assemblies with a recess for use with a filter element that has a section protruding in the insertion direction to be easily retrofitted – only the housing cover needs to be modified.

[0011] In particular, the filter element is preferably subjected to flow perpendicular to its planar extent during filter operation. Preferably, the filter element can be inserted into the housing body in the plane of its planar extent. Furthermore, the opening in the housing body can preferably be designed as a receiving shaft. Preferably, the housing body and the opening in the housing body are designed such that the filter element can be completely received within the opening. Additionally, the housing cover can be connected to the housing body to close the opening. This can be achieved, for example, by means of a suitable fastener. In particular, the fastener can be a screw, a clamp, an adhesive, or another means suitable for connecting the housing cover and the housing body.

[0012] In particular, the filter element can, for example, comprise a filter medium and one or more reinforcing elements, especially side and / or headbands (also referred to as forehead bands), which reinforce the filter medium at least in sections to maintain its shape, particularly during filter operation. The reinforcing elements can, in particular, form a closed or open frame – even as a single piece of material – that surrounds the filter medium. According to the definition used here, a “frame” comprises one or more reinforcing elements.

[0013] The reinforcing elements can be bonded to the filter medium at its edges, in particular by adhesive bonding. For this purpose, the reinforcing elements can be heated and the filter medium pressed into the heated material. Alternatively, the reinforcing elements can be injection-molded onto the filter medium. An adhesive can also be used as an additive. The reinforcing elements themselves can be made of the same material as the filter medium. Alternatively, the reinforcing elements can be manufactured as injection-molded plastic components. The reinforcing elements can be rigid or flexible.

[0014] The filter medium can be folded or corrugated. Common folds include zigzag and W-folds. The filter medium can be embossed and then folded sharply along the embossed edges. A sheet of filter material can serve as the starting material, which is then shaped accordingly. Typically, the folds extend perpendicular to the machine direction of the filter medium. The side bands are generally connected to the fold faces of the filter medium, with the term "fold face" referring to the end surface that extends between adjacent fold edges of a given fold. The head bands are typically connected to the end faces of the filter medium in the machine direction.

[0015] The filter medium is, for example, a filter fabric, a filter mat, or a filter fleece. In particular, the filter medium can be manufactured using a melt blow molding process. The filter medium can consist of natural fibers, such as cotton, or synthetic fibers, for example, polyethylene, polypropylene, polyamide, polyester, polyphenylene sulfide, or polytetrafluoroethylene. During processing, the fibers can be oriented inwards, diagonally, and / or perpendicular to the machine direction.

[0016] The term "protruding section" refers in particular to a section of the filter element that projects or extends beyond a plane of the filter medium. The protruding section may, in particular, have one or more surfaces, wherein one of the axes spanning the surface(s) is perpendicular to the plane beyond which the protruding section extends.

[0017] More specifically, the protruding section can consist of two surfaces arranged at an angle to each other.

[0018] The recess is designed to accommodate a protruding sideband or headband section of the filter element. Because the protruding section is formed by means of the protruding sideband or headband section, it can be provided in a particularly simple manner. For example, if the section is formed by means of the sideband, the protruding section can be created, for instance, by simply extending the sideband.

[0019] According to a further embodiment, the recess is designed to accommodate a protruding side or head section of the filter element in the form of an angle. In particular, a protruding side or head section of the filter element in the form of an angle can exhibit greater stability, so that the protruding section cannot be bent or kinked as easily. This ensures that the filter element is inserted into the housing in the correct orientation.

[0020] According to a further embodiment, the recess is angled. The recess can be formed, for example, by means of grooves or slots. In particular, the recess can have a shape corresponding to the shape of the projecting section, especially the projecting sideband section or headband section of the filter element. For example, the angled recess can be formed by means of a first groove and a second groove, wherein the first groove and the second groove are arranged in the shape of an angle. For example, the recess can have the shape of a right angle, an acute angle, or an obtuse angle. In particular, the recess can be L-shaped or V-shaped.

[0021] According to a further embodiment, the housing has an additional recess in which a further section of the filter element, projecting in the insertion direction, can be received. In particular, the recess and the additional recess can have the same shape or different shapes. For example, the recess can be L-shaped and the additional recess V-shaped. Furthermore, the recess and the additional recess can have different dimensions. For example, the recess can have a greater depth than the additional recess. Providing an additional recess can, in particular, ensure that the filter element is inserted into the housing in the correct orientation.

[0022] According to another embodiment, the housing body or the housing cover each has the recess and the further recess, or the housing cover has the recess and the housing body has the further recess.

[0023] Furthermore, a filter element is provided, wherein the filter element can be inserted into an opening of a housing body in an insertion direction, and the opening of the housing body can be closed with a housing cover, wherein the filter element has a section projecting in the insertion direction which can be received in a recess arranged in the housing body or in the housing cover.

[0024] In particular, the protruding section of the filter element can be advantageously used to remove the filter element from the housing body, for example by pulling the filter element out of the opening in the housing body at the protruding section.

[0025] The protruding section of the filter element is formed by a portion of a sideband and / or a portion of a headband of the filter element. Specifically, the protruding section of the filter element can extend over a portion of a sideband profile and / or a portion of a headband profile. For example, the protruding section can be arranged in the form of an angle. Specifically, the protruding section can be a right angle, an acute angle, or an obtuse angle. In particular, the protruding section can be L-shaped or V-shaped. An angled shape of the protruding section can, for example, provide greater stability, making it less likely to bend or kink. This helps ensure that the filter element is inserted into a housing in the correct orientation.

[0026] The section protruding in the insertion direction is designed as an extraction aid.

[0027] According to a further embodiment, the filter element has a further section projecting in the insertion direction, which is formed by means of a further part of a side band and / or a further part of a head band of the filter element. In particular, the further projecting section can be arranged axially symmetrically to the projecting section or point-symmetrically to the projecting section. Providing a further projecting section can, in particular, ensure that the filter element is inserted into the housing in the correct orientation.

[0028] Furthermore, a filter arrangement is provided comprising a filter element as described above and a filter housing as described above, wherein the section of the filter element projecting in the insertion direction is received in the housing body or in the housing cover.

[0029] The filter element is specifically an interior air filter for filtering air for the interior of a vehicle or building. The filter element can be used in motor vehicles, trucks, construction machinery, watercraft, rail vehicles, building technology, or aircraft. Furthermore, the filter element can be an air filter for air supplied to an engine, particularly an internal combustion engine.

[0030] A suitable filter element serves to filter fluids, i.e., gaseous and / or liquid media, such as air. The gaseous medium, or air, also includes gas / air-solid mixtures or gas / air-liquid mixtures. For example, an air conditioning system may incorporate such a filter element. The filter element may have a sealing device that seals a raw side associated with the filter element against a clean side. The sealing device may be integrated with one or more reinforcing elements of the filter element. Alternatively, the sealing device may be designed as an additional component. For example, the sealing device may be attached to the filter medium, the one or more reinforcing elements, the filter element itself, or the filter housing.

[0031] The features described for the filter housing apply accordingly to the filter element and the filter arrangement, and vice versa.

[0032] In particular, the filter element can be rectangular. A rectangular filter element is one in which the pleat pack has the shape of a cuboid. The height of the pleat pack (h) is the distance between the surface on the upper edges and the surface on the lower edges. The width and length are the other two dimensions of the cuboid, with the height of the pleat pack preferably being less than the width and length. The term "rectangular" is most commonly used because it characterizes the flow area, which is bounded by the side faces of the filter element.With such a rectangular filter element, the problem is that without additional measures, the filter element can be accommodated in at least four different variants in a correspondingly rectangular recess of a filter housing; a square-shaped filter element, in which the width and length of the pleated pack are the same, could even be accommodated in eight different variants.

[0033] Often, a filter medium and the pleated pack made from it have a preferred flow direction. This means that, for optimal filtration, the pleated pack should always be subjected to a predefined flow direction when installed. This can be achieved, for example, with a rectangular filter element by having the opposite sides of the filter element extend diagonally in either the width or length direction (i.e., in the flow plane), and by having the housing have two corresponding recesses. Such a filter element can be rotated 180° in the flow plane, for example, but not 180° perpendicular to it. Therefore, it is ensured that the installed filter element is subjected to the correct flow direction.By extending only one side surface of the filter element in the flow plane, a unique position of the filter element can be enforced with only one corresponding recess in the housing.

[0034] Other possible implementations of the invention also include combinations of features or process steps described previously or subsequently with regard to the exemplary embodiments, even if not explicitly mentioned. In such cases, the person skilled in the art will also add individual aspects as improvements or additions to the respective basic form of the invention.

[0035] Further embodiments of the invention are the subject of the dependent claims and the exemplary embodiments of the invention described below. The invention will be explained in more detail below with reference to exemplary embodiments and the accompanying figures. Brief description of the drawings

[0036] This shows: Fig. 1A and Fig. 1B: a filter arrangement in a perspective view and in an exploded view according to a first embodiment; Fig. 2A to 2C: Variants of a filter element according to a second embodiment; and Fig. 3A to 3G: Variants of a filter element according to a third embodiment.

[0037] In the figures, identical or functionally equivalent elements have been provided with the same reference symbols unless otherwise indicated. embodiment(s) of the invention

[0038] Fig. 1A and Fig. Figure 1B shows a perspective view of a filter arrangement 1 according to one embodiment. The filter arrangement 1 can be used, for example, in a vehicle or a building.

[0039] The filter assembly 1 comprises a filter element 2 and a filter housing 3, which has a housing body 3a and a housing cover 3b. The housing body 3a includes an opening 5 into which the filter element 2 can be inserted in an insertion direction indicated by the arrow 6. The filter element 2 has a pleated filter medium 7, a headband 8, and a sideband 9.

[0040] The filter medium 9 is, for example, a filter fleece, filter fabric, filter mat, or filter felt, in particular a needle felt. Specifically, the filter medium 7 can be manufactured using a meltblown process. The filter medium 7 can consist of natural fibers, such as cotton, or synthetic fibers, for example, polyester, polyphenylene sulfide, or polytetrafluoroethylene. The fibers can be oriented diagonally and / or transversely to the machine direction M during processing. The fibers can also be stretched in a spatial direction. The filter medium 7 can be single- or multi-layered.

[0041] The filter medium 7 can have pleats 7a, which typically extend transversely to the machine direction M. The pleated filter medium is also referred to as pleated material. The pleats 7a can be created by folding along sharp fold edges (also referred to as pleat points) or by a wave-like design of the filter medium 7. Each pleat 7a can be defined by two fold sections connected by a corresponding fold edge. The folding can, in particular, be designed as a zigzag fold.

[0042] The pleats 7a have a height H, which in the illustrated embodiment also corresponds to the overall height of the filter element. A pleat configuration in which the pleats 7a have varying heights is also possible. Furthermore, the spacing between the pleats 7a can vary. The filter medium 7 can be self-supporting, meaning that the pleats 7a remain dimensionally stable during normal flow in filter operation.

[0043] The filter medium 7 is bounded in the machine direction M by end folds (not shown). Transversely to this, the filter medium 7 is bounded by fold end edges (not shown) (also referred to as fold profiles). "Fold end edge" refers to the end face of the fold, which extends between adjacent fold edges of a respective fold 7a.

[0044] The side bands 9, 13 are connected to the fold edges, and the head bands 8, 14 to the end folds, in particular by fusing, welding, or gluing. The side bands 9, 13 and the head bands 8, 14 can be made in one piece or in multiple parts. The side bands 9, 13 and the head bands 8, 14 can, for example, be made of a particularly flexible fiber material or as particularly rigid injection-molded plastic components.

[0045] The filter medium 7 can have a rectangular shape in top view, i.e., in the plane E of its planar extent. However, a triangular, pentagonal or polygonal, round or oval shape is also conceivable.

[0046] Filter medium 7 can function as a particle filter, removing particles, especially dust, suspended solids, or liquid droplets, from intake air. Additionally, filter medium 7 can function as an odor filter. For this purpose, it can, for example, incorporate a layer of activated carbon. More generally, filter medium 7 can be designed to absorb or adsorb certain solid, liquid, and / or gaseous substances.

[0047] During filter operation, air L flows through the filter medium 7 perpendicular to its planar extent. The air L flows from a raw side RO of the filter element 2 towards a clean side RE of the same.

[0048] Furthermore, the housing cover 3b has a recess 10 in which a section 11 of the filter element 2, projecting in the insertion direction 6, can be received. Alternatively, as indicated, the recess 10 can also be arranged in the housing body 3a. In further embodiments, the filter housing 3 can have a further recess 17. The further recess 17 can also be arranged on the housing cover 3b. Alternatively, the further recess 17 can also be arranged on the housing body 3a. Furthermore, the filter housing 3 can also have several recesses. The recess 10 or the further recess 17 can, in particular, be a depression or a pocket in the material of the respective housing part. Preferably, the recess is provided in the housing part, which is manufactured using a simple open-close tool.

[0049] The protruding section 11 of the filter element 2 is, according to a first embodiment, according to the Fig. 1A and Fig. 1B is formed in an L-shape by means of the headband 8. In particular, a first leg 4a of the L-shaped projecting section 11 of the filter element extends along the entire pleat height H of the filter medium 7. A second leg 4b (also referred to as the L-angle) of the L-shaped projecting section 11 of the filter element 2 extends in the machine direction M perpendicular to the headband 8 along a portion of the sideband 9. In particular, the second leg 4b can be shorter than the first leg 4a. The recess 10 in the housing cover 4 is also L-shaped and has a first groove 10a and a second groove 10b, which are connected to each other in the form of an angle. In particular, the recess 10 can have a shape corresponding to the projecting section 11.

[0050] If the filter element 2 is inserted into the opening 5 of the housing body 3a in the insertion direction 6, the housing cover 3b can only close the opening 5 if the protruding section 11 is received in the recess 10. In the case of the Fig. 1A and Fig. In the embodiment shown in Figure 1B, the first leg 4a of the projecting section 11 is received in the first groove 10a of the recess 10, while the second leg 4b of the projecting section 11 is received in the second groove 10b of the recess 10. A poka-yoke effect is achieved by means of the projecting section 11 of the filter element 2 and the recess 10 in the housing cover 3b. This means that only the correct type of filter element 2 and / or the correctly oriented filter element 2 can be inserted into the opening 5 in the housing body 3a and enclosed in the opening 5 by means of the housing cover 3b.

[0051] The variants of filter element 2 according to a second embodiment are described below. Fig. 2A to 2C explained, focusing solely on the differences compared to the Fig. 1A and Fig. 1B is entered.

[0052] The Fig. Figure 2A illustrates an embodiment of a filter element 2 in which a projecting section 11 is formed by means of a portion of the side band 9. The projecting section 11 is L-shaped and has a first leg 4a and a second leg 4b. The first leg 4a extends over the entire fold height H, while the second leg 4b extends perpendicular to the machine direction M in the plane of extension E of the filter element 2.

[0053] The Fig. Figure 2B illustrates another embodiment of a filter element 2, which is similar to the filter element 2 in Fig. 2A differs in that the filter element 2 is in Fig. 2B has a further projecting section 12. The further projecting section 12 is formed by means of a part of a further lateral band 13, which is opposite the lateral band 9. In particular, the further projecting section 12 has a shape that is mirror-symmetrical to the projecting section 11.

[0054] The Fig. Figure 2C illustrates another embodiment of a filter element 2, which is similar to the filter element 2 in Fig. 2A differs in that the side band 9 and the further side band 13 each have a part 9a and 13a respectively, wherein the parts 9a and 13a are arranged in a V-shape on the side band 9 and the further side band 13 respectively.

[0055] The variants of filter element 2 according to a third embodiment are described below. Fig. 3A to 3G explained, focusing solely on the special features compared to the Fig. 1A and Fig. 1B is entered.

[0056] The Fig. Figure 3A illustrates an embodiment of a filter element 2 in which a projecting section 11 is formed by means of a portion of the headband 8. The projecting section 11 is L-shaped and has a first leg 4a and a second leg 4b, the first leg 4a being longer than the second leg 4b. The first leg 4a extends over the entire fold height H, while the second leg 4b extends perpendicularly to the headband 8 of the filter element 2 in the machine direction M.

[0057] The Fig. Figure 3B illustrates another embodiment of a filter element 2, which is similar to the filter element 2 in Fig. 3A differs in that the filter element 2 has a further projecting section 12. The further projecting section 12 is also formed by means of a part of the headband 8, wherein the further projecting section 12 is mirror-symmetrical to the projecting section 11 with respect to a center line M' extending in the machine direction M. In this case, a housing into which the filter element 2 is inserted would be Fig. 3B is inserted, having both a recess in a housing cover and another recess in a housing body.

[0058] The Fig. Figure 3C illustrates another embodiment of a filter element 2, which is similar to the filter element 2 in Fig. 3B differs in that the further projecting section 12 is formed by means of a part of a further headband 14, wherein the further projecting section 12 is mirror-symmetrical to the projecting section 11 with respect to a center line M'' extending in the plane perpendicular to the machine direction M. In this case, a housing into which the filter element is inserted would be Fig. 3C is inserted, the recess and the further recess either in the housing body 3a or in the housing cover 3b.

[0059] The Fig. 3D illustrates another embodiment of a filter element 2, which is similar to the filter element 2 in Fig. 3B differs in that the filter element, in addition to the projecting section 11 and the further projecting section 12, also has a third projecting section 15 and a fourth projecting section 16. The third projecting section 15 and the fourth projecting section 16 are formed by means of a part of a further headband 14, wherein the third projecting section 15 and the fourth projecting section 16 are mirror-symmetrical with respect to a center line M'' extending in the plane perpendicular to the machine direction M with respect to the projecting section 11 and the further projecting section 12.

[0060] The Fig. Figure 3E illustrates an embodiment of a filter element 2, which is similar to the filter element 2 in Fig. 3A differs in that the headband 8 has a part 8a which is arranged in a V-shape on the headband 8.

[0061] The Fig. Figure 3F illustrates another embodiment of a filter element 2, which is similar to the filter element 2 in Fig. 3E differs in that the projecting section 11 has the form of an isosceles right angle with a first leg 4a and a second leg 4b. The first leg 4a extends along a portion of the fold height H, the length of leg 4a being shorter than the fold height H. The second leg 4b extends in the machine direction M in the extension plane E of the filter element 2. Furthermore, the headband 8 has a portion 8a which is arranged at an obtuse angle to the first leg 4a.

[0062] The Fig.Figure 3G illustrates a further embodiment of a filter element 2, wherein the projecting section 11 has the shape of an isosceles right angle with a first leg 4a and a second leg 4b. The first leg 4a extends along a portion of the fold height H, the length of the leg 4a being shorter than the fold height H. The second leg 4b extends perpendicularly in the machine direction M in the extension plane E of the filter element 2.

[0063] Although the invention has been described above with reference to specific embodiments, it is not limited to these, but can be modified in many ways.

Claims

[1] Filter arrangement (1) with a filter element (2) and with a filter housing (3) comprising a housing body (3a) which has an opening (5) into which the filter element (2) can be inserted in an insertion direction (6), and a housing cover (3b) for closing the opening (5) in the housing body (3a), wherein the housing cover (3b) has a recess (10) in which a section (11) of the filter element (2) projecting in the insertion direction (6) is received, wherein the section (11) projecting in the insertion direction (6) is designed as an extraction aid, characterized by , that the protruding section (11) is formed by means of a part of a side band (9) and / or a part of a head band (8) of the filter element (2) and the recess (10) is designed to accommodate a protruding side band section (9) or head band section (8) of the filter element (2). [2] Filter arrangement (1) according to claim 1, wherein the recess (10) is configured to accommodate a protruding sideband section (9) or headband section (8) of the filter element (2) in the form of an angle. [3] Filter arrangement (1) according to one of claims 1 or 2, wherein the recess (10) is angled. [4] Filter arrangement (1) according to one of claims 1 to 3, further comprising a further recess (17) in which a further section (12) of the filter element (2) projecting in the insertion direction (6) can be received. [5] Filter arrangement (1) according to claim 4, wherein the housing cover (3b) has the recess (10) and the further recess (17) or wherein the housing cover (3b) has the recess (10) and the housing body (3a) has the further recess (17). [6] Use of a filter element (2) in a filter arrangement (1) according to any one of claims 1 to 5, wherein the filter element (2) can be inserted into an opening (5) of a housing body (3a) of the housing (3) in an insertion direction (6), wherein the opening (5) of the housing body (3a) can be closed with a housing cover (3b), and wherein the filter element (2) has a section (11) projecting in the insertion direction (6) which can be received in a recess (10) arranged in the housing cover (3b), wherein the section (11) projecting in the insertion direction (6) is designed as an extraction aid, and wherein the projecting section (11) is formed by means of a part of a side band (9) and / or a part of a head band (8) of the filter element (2).

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