DE102013014498B4 - Filter element, its use and filter system - Google Patents

Abstract

Filter element (10), comprising a filter body (12) in concentric shape with a longitudinal axis (L), a first end plate (16) arranged on an end face (15) with a seal (26) for sealing the unfiltered from the filtered air space and a second end plate (18) made of flexible material such as polyurethane foam or elastomer, arranged on the opposite end face (17), the second end plate (18) having a centering element (22) arranged around the longitudinal axis (L), which is stiffened by a stiffening element (32) whereby the filter element (10) can be centered and / or supported at least radially when installed in a housing (108), the centering element (22) having an annular body (22a) formed as an annular bead and arranged thereon, extending from the annular body (22a) in the direction of the longitudinal axis (L) extending support elements (20) made of the soft elastic material, the support elements (20) for at least axial support de s filter element (10) are provided adjacent to an inner cover contour (114) of the housing (108).

Description

Technical area

The invention relates to a filter element, in particular for use as an air filter for an internal combustion engine, and a filter system for installing such a filter element.

State of the art

Out DE 20 2007 014 821 U1 a filter element with a seal surrounding an annular collar is known. Out DE 20 2007 014 822 U1 a filter element with a V-shaped seal is known. From the DE10 2007 017 091 A1 a ring filter element is known in which an inner frame, which is arranged on an inner lateral surface and on the axial end faces of a filter body of the ring filter element, is encapsulated with sealing material in the area of the axial end faces of the filter body and embedded in this, but not in the area of the inner lateral surface of the filter body . The end plate provided with an axial seal is restricted to the end face of the filter body or the ring filter element. In the area of the inner jacket surface, application of sealing material is restricted to the areas between the webs of the inner frame. An inner diameter of the end plate is at least as large as an inner diameter of the inner frame in all areas, whereby the inner frame, which is designed in particular as a support grid, is not covered radially inward by sealing material of the end plate (axial seal). The end disk is made of a material that seals the filter material.

In the DE10 2007 017 091 A1 the inner frame has a ring which protrudes axially beyond the filter body, which ring is part of a radial step on the inner frame side and which is embedded in an annular sealing lip of the end plate. The ring stiffens the annular sealing lip. Since the sealing material of the end plate / axial seal completely surrounds the ring protruding axially beyond the filter body, it does not come into contact with the filter housing; the support structure is firmly connected to the filter body of the ring filter element via the end plate / axial seal.

The filter elements of air filters are usually replaced after a certain operating time. Depending on the amount of dust, the service life of an air filter can be a few days, e.g. when used in construction machinery, up to several months in a less dusty environment.

Reliable and process-safe sealing of the filter element in a housing is particularly important when filter elements are frequently replaced. The seal should be temperature-resistant and vibration-proof. The sealing of the filter element must also be guaranteed in systems or facilities that are exposed to strong vibrations or shocks. At the same time, however, the filter element itself should not have any metallic elements so that it can be thermally disposed of without any problems.

It is therefore an object of the invention to create a filter element with a reliable seal between the area of the unfiltered and the area of the filtered medium, which ensures reliable assembly, especially when the filter element is exchanged several times.

A further object of the invention is to create a filter system for receiving such an exchangeable filter element with a reliable seal and safe assembly.

Disclosure of the invention

The aforementioned objects are achieved according to one aspect of the invention by a filter element according to claim 1, in which at least one of the end plates has a centering element arranged around the longitudinal axis, which is stiffened by a stiffening element, whereby the filter element can be centered at least radially when installed in a housing / or can be supported, wherein the centering element has an annular body and support elements arranged thereon and extending in the direction of the longitudinal axis, the support elements being provided for at least axial support of the filter element against an inner cover contour of the housing.

Favorable configurations and advantages of the invention emerge from the further claims, the description and the drawing.

According to the invention, a filter element is proposed which comprises a filter body in concentric form with a longitudinal axis, a first end plate arranged on one end face with a seal for sealing the unfiltered from the filtered air space and a second end plate made of flexible polyurethane foam or elastomer arranged on the opposite end face , wherein the second end plate has a centering element arranged around the longitudinal axis, which is stiffened by a stiffening element, whereby the filter element can be centered and / or supported at least radially when installed in a housing. Furthermore, the centering element has an annular body and support elements arranged thereon and extending from the annular body in the direction of the longitudinal axis, the support elements serving to at least axially support the filter element are provided adjacent to an inner cover contour of the housing.

According to the invention, the invention has a centering element that is stiffened by stiffening elements, whereby the bending stiffness of the centering element is significantly increased in comparison with conventional protruding bracing extensions, such as knobs or similar elements, on a closed filter element end disk in pure polyurethane design, in which the knobs are axially pressed or bent radially inwards.

Axial support of the filter element in the housing takes place by support elements which are attached to an annular body of the centering element and can be designed, for example, in the form of a knob or a similar shape. Advantageously, these support elements can fold radially inwards and / or outwards in the installed state, with the ring body remaining largely undeformed in relation to the support elements, since it is stiffened by the stiffening elements. A high flexural rigidity of the ring body is advantageous especially with large filter elements due to the high weight in order to fix the filter element securely and firmly even under vibration loads and to prevent possible twisting of the filter element.

A high dimensional stability of a centering element of a filter element, especially under environmental influences such as temperature, vibrations, is advantageous for larger and therefore heavier filter elements, especially for construction machinery or agricultural machinery, and also optimizes the repeated removal and installation of the filter elements when changing the filter. When such a filter element is used in construction machinery or agricultural machinery, the filter load with dust and dirt particles is very high, so that the weight of a loaded filter element can increase by a few kilograms. The filter element as well as the associated filter system must be designed to be robust.

According to the invention, the ring body is designed in the form of an annular bead. Advantageously, the ring body for radial support of the filter element can be provided in contact with an inner cover contour of the housing, in particular for radial centering and / or guidance. The ring body can also be arranged centered on an end face of the end disk. Furthermore, the ring body can have a diameter of, for example, 2/3 the diameter of the end plate. Its height above the end plate can for example be at least 10%, preferably between 10% to 20% of the diameter, which enables good guidance with the inner cover contour.

The cross-section of the ring body can advantageously be trapezoidal, in particular with a tapering outward in the axial direction. This makes it possible to introduce the ring body more easily into the counterpart of a corresponding inner cover contour of the housing. It is favorable here to provide the flanks of the trapezoidal shape in the axial direction with sufficient steepness in order to ensure a secure lateral guidance of the mounted filter element through the annular body. The inner lid contour can expediently be designed as a recess in the inner lid shape with a trapezoidal cross-section, so that the ring body fits positively into the inner lid contour, with usual manufacturing tolerances being provided as a gap between the shape of the ring body and the inner lid contour. The inner cover contour can expediently also contain corresponding counterparts of the support elements, which can be designed, for example, in the form of knobs, in order to also have a favorable interlocking of the support knobs with the inner cover contour and thus with the cover of the housing, so that a corresponding security against rotation of the filter element installed in the housing is attainable. In order to be able to represent the function of the interlocking of the built-in filter element with the cover, it is alternatively also advantageous to provide a corrugation on the surface of the inner cover contour facing the ring body. This enables the ring body to be interlocked with the inner cover contour, since the support elements are flexible and can therefore adapt to the exact shape of the inner cover contour. Even if the support elements fold radially outward or inward due to their flexibility, if they are designed as knobs or tooth-shaped, for example, they can interlock with the corresponding counterparts in the inner cover contour in such a way that the built-in filter element remains non-rotatably mounted.

The centering element, in particular the ring body, which is stiffened by the stiffening element, can rest against the inner cover contour of the housing due to its high flexural rigidity and support it radially, so that the filter element is firmly supported. This means that the filter element does not move, even under major vibrations, such as those that occur in use on an internal combustion engine. Another advantage is the high reproducibility of the installation position, even when filter elements are installed and removed several times.

It can also be advantageous if the stiffening element extends essentially only in the ring body, in particular is embedded. As a result, only the ring body is stiffened and support elements, which, like the end plate, are made of flexible material, can more easily fold over when installed in a housing and thereby axially tension the filter element. The stiffening element can expediently be designed with an L-shaped cross section in such a way that it can spatially distribute an axial force introduction into the filter body. An L-shaped cross section allows an axial force to be introduced into the ring body of the centering element and then into the end plate, which is firmly attached to the filter body. The force can then be introduced into the filter body via the end plate, which enables the filter element to be firmly braced in the housing.

A reinforcing element can advantageously be provided in the area between the filter body and the second end disk in order to be able to absorb a greater force via the reinforcing element, since the axial force can be introduced into the filter body via the reinforcing element and the reinforcing element of the end disk.

In an advantageous embodiment, the stiffening element can be designed in the shape of a comb. If, during the manufacturing process, this stiffening element is encapsulated with a polyurethane foam or an elastomer, for example, a relatively rigid centering element, especially in the ring body, can be achieved in this way, but due to its soft elasticity, it also has good sealing properties when installed in a housing. The encapsulation ensures good interlocking with the material of the end plate.

The first end plate, like the second end plate, can advantageously consist of a polyurethane foam or an elastomer. Of course, it is also possible to manufacture the end disk from several plastic components in order to ensure optimal deformability over a wide temperature range, as can occur in practice. Thermoplastics are also not excluded. Both end plates can be welded or glued to the filter body in order to produce a stable connection.

In a favorable embodiment, the filter body can consist, for example, of a zigzag-shaped folded (pleated) filter bellows and be designed as a closed ring. The folding can be produced, for example, by knife folding, for longer filter bodies, or rotary folding. The filter bellows can for example consist of paper or cellulose or a mixed fiber made of plastic and cellulose. The filter bellows can also be designed with a smooth surface, rolled and / or designed in various embossed shapes for stiffening and / or creating cavities for dust deposition. The filter bellows can have a coating and / or impregnation in order to repel moisture. Alternatively, it can also be coated with nanofibers. The filter body can also be structurally stiffened with a thread winding. The use of these materials as a filter medium is a very economical way of realizing such a filter element. At the same time, the shape described offers a stable arrangement, so that the filter body has a self-supporting construction and thus favorable assembly properties.

The filter element can expediently be used as an air filter, in particular as an air filter of an internal combustion engine. The safe operation of internal combustion engines is also based on safe and inexpensive filtering of the intake air for combustion operation. The filter element described is an economical option for this.

The use of the filter element as a particle filter, in particular as a particle filter of an internal combustion engine, is also advantageous. Here, too, the safe assembly and economic interchangeability of the filter element described are of decisive importance.

According to a further aspect, the invention relates to a filter system with a filter element according to one of the preceding claims, comprising a housing which is constructed essentially concentrically around a longitudinal axis, a cover which closes the housing and which is also constructed concentrically around the longitudinal axis and on its inside has an inner cover contour on which an annular body of a centering element can be radially supported and on which support elements arranged on the centering element can be placed and axially supported, an inlet arranged on the housing and / or cover for supplying the medium to be filtered, in particular air, concentrically on the housing an outlet for discharging the filtered medium is provided to the longitudinal axis, a sealing contour being provided on the housing in the area of the outlet, which corresponds to the radial seal of the first end disk of the filter element, the filter element being exchangeable in the housing d it is arranged filter system.

The main advantage of such a filter system is the safe and stable installation of the filter element and the very economical exchangeability of the filter element in the event of service. Rapid interchangeability is of great importance, especially with short downtimes, as can occur in agricultural and construction machinery.

A cyclone separator can advantageously be provided in the area of the inlet of the filter system and a dirt outlet can be provided on the housing or on the cover. This cyclone separator consists of a guide geometry that causes the medium to be filtered to rotate. As a result of this rotation, the dirt is concentrated in the area of the housing wall and discharged at a suitable point via a dirt outlet. By pre-separating most of the dirt from the air to be filtered, the service life of the actual filter element can be significantly extended.

According to a further embodiment of the invention, a secondary element can be arranged in the interior of the filter element. The secondary element, which can consist of a load-bearing structure that is clad with a permeable filter medium, for example a fleece, has the task of keeping the outlet of the filter system closed when the filter element is replaced, so that no dirt can enter this area while the filter element is being cleaned or replaced. In a preferred embodiment, the secondary element is connected to the housing via a screw connection and is provided with a seal relative to the housing.

Brief description of the drawings

Further advantages emerge from the following description of the drawings. Exemplary embodiments of the invention are shown in the drawings. The drawings, the description and the claims contain numerous features in combination. The person skilled in the art will expediently also consider the features individually and combine them into useful further combinations.

• 1 eine perspektivische Ansicht eines Filtersystems nach einem Ausführungsbeispiel der Erfindung mit tangentialem Einlass, zentrischem Auslass und bodenseitigem Schmutzauslass;
• 2 einen Längsschnitt durch ein Filtersystem nach einem Ausführungsbeispiel der Erfindung mit tangentialem Einlass, zentrischem Auslass und bodenseitigem Schmutzauslass;
• 3 eine perspektivische Darstellung eines Filterelements nach einem Ausführungsbeispiel der Erfindung mit Sicht auf eine zweite Endscheibe mit einem Zentrierelement und Versteifungselementen;
• 4 eine perspektivische Ansicht eines Filtersystems mit einem eingebauten Filterelement nach einem Ausführungsbeispiel der Erfindung mit Sicht auf das Zusammenwirken von Zentrierelement und Deckelkontur;
• 5 einen Teillängsschnitt eines Filtersystems nach einem Ausführungsbeispiel der Erfindung mit Sicht auf das Zusammenwirken von Zentrierelement und Deckelkontur.

It shows as an example:

• 1 a perspective view of a filter system according to an embodiment of the invention with tangential inlet, central outlet and bottom-side dirt outlet;
• 2 a longitudinal section through a filter system according to an embodiment of the invention with tangential inlet, central outlet and dirt outlet on the bottom;
• 3 a perspective view of a filter element according to an embodiment of the invention with a view of a second end disk with a centering element and stiffening elements;
• 4th a perspective view of a filter system with a built-in filter element according to an embodiment of the invention with a view of the interaction of centering element and cover contour;
• 5 a partial longitudinal section of a filter system according to an embodiment of the invention with a view of the interaction of centering element and cover contour.

Embodiments of the invention

Identical or similar components are numbered with the same reference symbols in the figures. The figures show only examples and are not to be understood as restrictive.

1 Figure 3 shows a perspective view of a filter system 100 according to an embodiment of the invention with a tangential inlet 102 , centric outlet 104 on one housing face and dirt outlet on the bottom 106 . A round filter design is shown that consists of a housing 108 consists that with a lid 110 , for example with a screw or bayonet lock, is closed.

When used as an air filter system, dust-laden air flows into the inlet 102 , which is arranged tangentially to the internally installed air filter element, so that the air inside the housing 108 is set in rotation by a flow protection on the filter element. The filter element and flow protection are not shown in the drawing. Due to the cyclone effect caused by the rotational movement of the air, centrifugal forces act on the dust particles in the flowing air, so that these are partially deposited on the housing wall and via the dirt outlet 106 from the filter system 100 can flow away. As a result, the filter element is less stressed and the service life of the filter element is increased. The cleaned air can be discharged through the central outlet 104 out of the case 108 be discharged.

In 2 is a longitudinal section through a filter system 100 according to an embodiment with a tangential inlet 102 , centric outlet 104 and dirt outlet on the bottom 106 shown. The case 108 of the filter system 100 is with a lid 110 locked. A filter element 10 , the filter body arranged concentrically to a longitudinal axis L. 12 is on two opposite end faces 15th , 17th with a first and a second end plate 16 , 18th , which can be made of polyurethane foam or an elastomer, for example, completed. The filter body 12 can for example consist of a zigzag-shaped folded (pleated) filter bellows and be designed to be closed in a ring shape. The folding can for example by knife folding, for longer filter bodies 12 , or rotational folding. The filter bellows can, for example, from Paper, cellulose or a mixed fiber made of plastic and cellulose are made with a smooth surface, rolled and / or designed in different embossing forms surface to stiffen and / or create cavities for dust deposition. The filter bellows can have a coating and / or impregnation in order to repel moisture. Alternatively, it can also be coated with nanofibers. The filter body 12 can still be structurally stiffened with a thread wrap.

The second end disk 18th has a centrally arranged centering element 22nd after inserting the filter element 10 in the housing 108 and closing the lid 110 to an inner lid contour 114 creates a radial guidance of the filter element 10 when installing in the housing 108 as well as later during the operation of the filter system 100 causes. The centering element 22nd has an annular body 22a on and therefrom in the longitudinal direction L extending away support elements 20th , which when installed in the receiving housing 108 on an inner lid contour 114 of the lid 110 adjacent, in a radial direction 38 fold inwards and / or outwards and thereby on the housing 108 support axially. This is how the filter element works 10 in the case 108 after closing the lid 110 Fixed in the radial and axial direction.

On the opposite face 15th of the filter element 10 is on the first end plate 16 a radial seal 26th attached, with the help of which the filter element 10 over the seal contour 116 on the housing 108 supported radially and seals the unfiltered air space from the filtered air space. The filter element 10 is thus both axially and twice radially against the housing 108 tense.

Dust-laden air can pass through the inlet 102 in the direction of the arrow 40 flow in, which in this case is shown as a tangential inlet and through which with the help of a cyclone separator 36 caused rotational movement of the air enables cyclone operation. Dust particles can partially pre-deposited due to the rotational movement on the inner housing wall and through the dirt outlet 106 when installing the filter housing 108 in a horizontal position downwards by gravity from the filter system 100 be emptied. During operation, the air flows through the filter body after partial separation of the dust particles 12 in the direction of the arrow 42 , 44 inside 50 of the filter element. Depending on the filter medium, dust particles remain in the filter medium from a certain size. The filter element must therefore, depending on the amount of dust introduced 10 can be replaced after a certain period of time.

Via the outlet 104 the filtered air flows in the direction of the arrow 46 from. Internally 50 of the filter element 10 is a secondary element 28 attached, which consists essentially of a load-bearing structure with a relatively permeable filter medium, for example a fleece, and when the filter element is replaced 10 in the housing 108 to protect the further air duct, for example an internal combustion engine, against ingress of dust particles and other objects. The secondary element 28 can, for example, be fixed to the outlet-side part of the housing via screw or snap-in connections 108 screwed in.

The filter element 10 can be used as an air filter, in particular as an air filter for an internal combustion engine. In principle, however, use as a particle filter in a similar design is also conceivable.

In 3 Figure 3 is a perspective view of a filter element 10 according to an embodiment of the invention with a view of a second end disk 18th with a centering element 22nd , consisting of ring body 22a and support element 20th , as well as in the centering element 22nd injected stiffening element 32 shown. The filter element 10 with the end disk 18th is cut lengthways so that it is on the filter body 12 overlying stiffening element 32 can be seen. The stiffening element 32 consists in the embodiment shown of a plastic ring with an L-shaped cross-section, on which a comb-like structure in the form of individual tips are attached in the longitudinal direction L, which, in the end disk 18th injected, to stiffen the end cap made of softer elastic material 18th contribute. The stiffening elements 32 only stiffen the ring body 22a but not the one on the ring body 22a attached support elements 20th , which are designed in the embodiment shown in the shape of a knob. The support elements 20th when installed in a housing, when a cover is pressed on, fold over radially inwards and / or outwards, thereby enabling the filter element to be axially braced 10 in the housing, while the ring body 22a of the centering element 22nd based on the support elements 20th remains essentially undeformed. This allows the centering element 22nd with different areas of the centering element 22nd at the same time an axial support (through the soft support elements 20th ) and a radial support of the filter element 10 (through the rigid ring body 22a) cause.

4th Figure 3 shows a perspective view of a filter system 100 with a built-in filter element 10 according to an embodiment of the invention with a view to the interaction of the centering element 22nd , consisting of ring body 22a and support elements 20th , as well as an inner lid contour 114 a lid 110 . The filter system 100 is partially cut open to show the filter element 10 to enable in the installed state. You can see how the one on the end disk 18th attached ring body 22a with the inner lid contour 114 cooperates to a radial guidance of the filter element 10 to effect. It can also be seen how the support elements 20th when installing the filter element 10 and closing the lid 110 fold over and so an axial bracing of the filter element 10 in the housing 108 cause. The ring body 22a can be designed as shown here in the form of an annular bead centered on one end face 17th the end disk 18th is arranged and a diameter of, for example, 2/3 of the diameter of the end plate 18th having. Its height above the end disk 18th can, for example, be 10-20% of the diameter to ensure good guidance with the inner lid contour 114 to enable. The cross-section of the ring body 22a can advantageously be trapezoidal with a taper in the axial direction L to the outside, whereby the ring body 22a more easily into the counterpart of a corresponding inner lid contour 114 of the housing 110 can be introduced. It is advantageous here to provide the flanks of the trapezoidal shape in the axial direction L with sufficient steepness in order to ensure reliable lateral guidance of the mounted filter element 10 through the ring body 22a to guarantee. The inner lid contour 114 can expediently be designed as a recess in the inner lid shape with a likewise trapezoidal cross-section, so that the ring body 22a form-fit in the inner lid contour 114 fits, with usual manufacturing tolerances as a gap between the shape of the ring body 22a and the inner lid contour 114 should be provided. The inner lid contour 114 can expediently corresponding counterparts of the support elements 20th , which can be designed in the form of nubs, for example, in order to also have a favorable toothing of the support nubs 20th with the inner lid contour 114 and thus with the lid 110 of the housing 108 to have a corresponding security against rotation of the built-in filter element 10 in the housing 108 is attainable. To the function of the teeth of the built-in filter element 10 with the lid 110 To be able to represent, it is alternatively also advantageous to have a corrugation on the ring body 22a facing surface of the inner lid contour 114 to be provided. This allows a toothing of the ring body 22a with the inner lid contour 114 can be achieved because the support elements 20th are flexible and thus the exact shape of the inner lid contour 114 can customize. Even if the work supports 20th Due to their flexibility, they can fold radially outwards or inwards, if they are designed, for example, as knobs or tooth-shaped, with the corresponding counterparts in the inner cover contour 114 interlock so that the built-in filter element 10 remains mounted so that it cannot twist.

In 5 is a partial longitudinal section of a filter system 100 according to an embodiment of the invention with a view to the interaction of the centering element 22nd , consisting of ring body 22a and support elements 20th , as well as an inner lid contour 114 shown. You can see how the one on the end disk 18th attached ring body 22a with the inner lid contour 114 cooperates to a radial guidance of the filter element 10 to effect. It can also be seen how the support elements 20th when installing the filter element 10 and closing the lid 110 fold radially and thus an axial bracing of the filter element 10 in the housing 108 cause. Inside the end plate 18th and embedded inside the ring body 22a is a stiffening element 32 shown, which is the flexible end cap 18th stiffened in itself, as well as the bending stiffness of the ring body 22a elevated. In the section you can also see a reinforcement element 30th the end disk 18th additionally stiffened and an introduction of the bracing force via the stiffening element 32 on the filter body 12 allows, the stiffening element 32 is designed with an L-shaped cross-section in such a way that there is an axial introduction of force into the filter body 12 spatially distributed. Next is inside 50 of the filter element 10 a secondary element 28 to recognize.

Claims (15)

Filter element (10), comprising a filter body (12) in concentric shape with a longitudinal axis (L), a first end plate (16) arranged on an end face (15) with a seal (26) for sealing the unfiltered from the filtered air space and a second end plate (18) made of flexible material such as polyurethane foam or elastomer, arranged on the opposite end face (17), the second end plate (18) having a centering element (22) arranged around the longitudinal axis (L), which is stiffened by a stiffening element (32) whereby the filter element (10) can be centered and / or supported at least radially when installed in a housing (108), the centering element (22) having an annular body (22a) formed as an annular bead and arranged thereon, extending from the annular body (22a) in the direction of the longitudinal axis (L) extending support elements (20) made of the soft elastic material, the support elements (20) for at least axial support de s filter element (10) are provided adjacent to an inner cover contour (114) of the housing (108). Filter element after Claim 1 , wherein the stiffening element (32) is essentially only in Ring body (22a) extends, in particular is embedded. Filter element according to one of the preceding claims, wherein the stiffening element (32) is designed with an L-shaped cross-section in such a way that it spatially distributes an axial force introduction into the filter body (12). Filter element according to one of the preceding claims, a reinforcing element (30) being provided in the area between the filter body (12) and the second end plate (18). Filter element after Claim 3 or 4th , the axial force introduction into the filter body (12) via the stiffening element (32) and via the reinforcing element (30). Filter element according to one of the preceding claims, wherein the stiffening element (32) is designed in the shape of a comb. Filter element according to one of the preceding claims, wherein the filter body (12) is pleated and designed to be closed in a ring shape. Filter element after Claim 7 , the filter body made of paper or cellulose or a mixed fiber made of plastic and cellulose. Use of a filter element (10) according to one of the preceding claims as an air filter, in particular as an air filter of an internal combustion engine. Filter system (100) with a filter element (10) according to one of the preceding claims, comprising - A housing (108) which is constructed essentially concentrically around a longitudinal axis (L), - A cover (110) closing the housing (108), which is also constructed concentrically around the longitudinal axis (L) and has an inner cover contour (114) on its inside, on which an annular body (22a) of a centering element (22) can be radially supported and on which support elements (20) arranged on the ring body (22a) can be placed and axially supported, - An inlet (102) arranged on the housing (108) and / or cover (110) for supplying the medium to be filtered, in particular air, an outlet (104) for discharging the filtered medium is provided on the housing (108) concentric to the longitudinal axis (L), a sealing contour (116) being provided on the housing (108) in the area of the outlet (104), which is aligned with the radial The seal (26) of the first end disk (16) of the filter element (10) corresponds, the filter element (10) being exchangeably arranged in the housing (108) of the filter system (100). Filter system (100) Claim 10 wherein a cyclone separator (36) is provided in the area of the inlet (102) and a dirt outlet (106) is provided on the housing (108) or on the cover (110). Filter system (100) Claim 10 or 11 , wherein a secondary element (28) is arranged in the interior (50) of the filter element (10). Filter system (100) Claim 12 , the secondary element (28), connected to the housing (108), remaining in the housing (108) when the filter element (10) is changed. Filter system according to one of the Claims 10 - 13 , wherein the support elements (20) are arranged such that they fold over in the radial direction when installed in the housing (108), the ring body (22a) of the centering element (22) remaining essentially undeformed with respect to the support elements (20). Filter system according to one of the Claims 10 - 14th , wherein the annular body (20) for radial support of the filter element (10) is provided in contact with an inner cover contour (114) of the housing (108), in particular for radial centering and / or guidance.

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