FILTER WITH A DRAIN LOCK ELEMENT

Description

Technical field

[0001] The invention relates to a filter for liquid, in particular oil or fuel, in particular of an internal combustion engine, in particular of a motor vehicle, with at least one filter element with a filter medium, which circumferentially surrounds an element interior with respect to an imaginary axis and which is connected at at least one end face axial with respect to the axis to an end body, wherein the end body has a filter element idle opening surrounding the axis, which is connected to the element interior, and at least one filter element sealing surface or filter element sealing surface of a filter element sealing device, which circumferentially surrounds the filter element idle opening and with which the filter element idle opening can be closed when the filter is assembled.

[0002] Not according to the invention is a drain closure element for at least one drain opening of a filter housing of a filter for liquid, in particular oil or fuel, in particular of an internal combustion engine, in particular of a motor vehicle, which has at least one sealing surface of a filter element sealing device for closing a filter element drain opening of a filter element of the filter, which circumferentially surrounds an imaginary axis, wherein the drain closure element can be connected to or separated from the filter element and / or the filter housing with respect to the axis by means of a rotational and / or insertion movement. State of the art

[0003] US3322280 A shows a filter and water separator for liquid fuels with a filter head and an inlet part and an outlet part for the passage of fuel from the inlet into the filter head into a filter cup and further from the outside inwards through a filter or separator insert and then to the outlet, wherein the cup is detachably attached to the filter head, sealed against it and extends downwards from it and is in contact with the inlet part and the cup is formed at its lower end below the filter insert to form a water collection container with a water drain opening.

[0004] From WO 2013 / 178680 A1, a filter device, particularly for a motor vehicle, is known, comprising a filter housing, a housing cover attached to the filter housing which has a housing cover drain opening, a filter element connectable or attached to the housing cover which has a filter element drain opening and, in a state mounted in the filter housing, separates a raw side from a clean side within the filter housing, and a sealing element attachable or mounted to the housing cover which, in a state attached to the housing cover, seals both the housing cover drain opening and the filter element drain opening. The sealing element has a radial seal by means of which, in the state attached to the housing cover, the sealing element seals the raw side against the clean side in the filter element drain opening.

[0005] Document DE 20 2007 017 980 U1 shows a filter cartridge for an oil filter of an internal combustion engine, wherein the filter cartridge has a filter bypass valve attached to it in such a way that the filter cartridge together with the filter bypass valve forms a unit intended for common replacement.

[0006] EP3249184 A1 discloses a filter cartridge comprising at least one filter element forming a fluid channel with a first longitudinal axis, a front end cap sealed to a front of the filter element, a conduit with a rear end and a front end, wherein the conduit is attached to the front end cap, and a through-hole in the front end cap, wherein the through-hole provides a fluid connection between the channel and the conduit.

[0007] The invention is based on the objective of designing a filter of the type mentioned above in which a seal of the filter element sealing device can be easily replaced. Disclosure of the invention

[0008] According to the invention, the problem is solved in the filter by the filter element sealing device having at least one seal that is circumferentially connected with respect to the axis and which is attached on the side of the filter element.

[0009] According to the invention, at least one seal is connected to the filter element. In this way, the at least one seal can be prefabricated together with the filter element and replaced if necessary.

[0010] Advantageously, at least one seal can be elastic. This allows for greater positional tolerance when installing the seal. Advantageously, at least one seal can be made of an elastomer.

[0011] In an advantageous embodiment, at least one seal can act radially and / or axially with respect to the axis. This at least one seal can act either radially or axially, or both radially and axially. Radially acting seals can be implemented largely independently of any axial assembly force between the filter components. Exclusively axially acting seals can be subjected to a correspondingly increased sealing pressure depending on an assembly force between the filter components, thereby improving the sealing effect.

[0012] In a further advantageous embodiment, at least one seal can be arranged on a sleeve-like positioning element that extends axially on the outside of the end body with respect to the axis and that at least partially forms the filter element's drain opening. In this way, the at least one seal can be held securely. Furthermore, a single component, namely the positioning element, can serve both for positioning, in particular, the filter element relative to the housing and / or to a corresponding drain closure element for at least one drain opening, and as a retaining element for the at least one seal.

[0013] In a further advantageous embodiment, at least one seal can be arranged radially outside the sleeve-like positioning element with respect to the axis.

[0014] In this way, the interior of the positioning element cannot be restricted by at least one seal.

[0015] Advantageously, the positioning element can have at least one receptacle, in particular a circumferential sealing groove, on its radially outer circumferential side, for which at least one seal can be held. The at least one seal can be securely held and positioned in the receptacle.

[0016] Advantageously, the positioning element can have a sealing surface on its radially outer circumferential side, extending circumferentially with respect to the axis, for the contact of at least one seal. In this way, the seal can act as a seal against the positioning element in the radial direction.

[0017] Alternatively, the positioning element can have circumferentially interrupted positioning surfaces on its radially outer circumferential side. In this way, the at least one seal can still bear against the radially outer circumferential side of the positioning element, but a radial seal can be avoided. In this case, the at least one seal can be designed to act as a seal exclusively in the axial direction.

[0018] In another embodiment, the end body of the filter element comprises an additional sleeve. This sleeve is firmly connected to the end body, for example, by snapping, welding, bonding, or other means. Such a design facilitates the tool-friendly shaping of the end body and the required sealing surfaces, particularly in plastic injection molding. The additional sleeve can be inserted axially into the end body of the filter element. Advantageously, the additional sleeve projects axially beyond the end body inside the filter element. This allows for the formation of a rebate, for example, with an edge projecting radially beyond the opening in the axial direction, which enables a firm connection between the sleeve and the end body.The additional sleeve can have a circumferentially continuous sealing groove in which a filter element seal, for example an O-ring seal, is received. When the filter is installed, this seal acts radially against the sealing surface formed by the drain plug element, sealing the interior of the filter element against its exterior. In an advantageous embodiment, the sleeve can be designed as a sleeve-shaped, coaxial positioning element. In a space-saving design, the end body can be axially recessed into the filter element.

[0019] Advantageously, the positioning element can be radially surrounded on the outside by an axially oriented sealing surface for at least one seal. At least one seal can interact axially with the axially oriented sealing surface.

[0020] Furthermore, the technical problem is solved according to the invention by a filter with a drain closure element in that the at least one sealing surface is freely accessible in the axial direction from an end face axial with respect to the axis, which faces or can face the interior of the filter housing for closing the at least one drain opening. In this way, a corresponding seal of the filter element sealing device can be brought into axial contact with the at least one sealing surface of the drain closure element from the axially opposite side, i.e., the side facing the interior of the filter housing. The sealing surface can also be separated from the seal. Thus, the drain closure element can be moved away from the filter element with the corresponding rotational and / or insertion movement, so that the filter element drain opening and the drain opening can be released.

[0021] In an advantageous embodiment, at least one sealing surface can be axially oriented with respect to the axis. In this way, in conjunction with the appropriate seal, a correspondingly exclusively axial sealing effect can be achieved.

[0022] In a further advantageous embodiment, the at least one sealing surface can be arranged radially inside or radially outside a centering element with respect to the axis. This centering element can interact with a positioning element of the filter element. The centering element can be configured as a centering projection or a centering opening. A centering projection can engage in a corresponding opening, in particular the filter element's idle opening, of the filter element's positioning element for positioning the filter element. A positioning element of the filter element, in particular a sleeve-shaped or pin-shaped one, can engage in a centering opening for positioning.

[0023] In the case of a centering element in the form of a centering opening, the sealing surface can be arranged on the circumferential side of the centering opening and directed radially inwards.

[0024] In the case of a centering element in the form of a centering projection, the sealing surface can radially surround the centering projection on the outside.

[0025] Furthermore, the technical problem with the filter is solved by arranging a filter element in the filter housing and closing the filter element drain opening and the drain opening with a drain closure element.

[0026] In an advantageous embodiment, the positioning element and the drain closure element are arranged overlapping in the axial direction, such that at least one region of the positioning element circumferentially surrounds at least one region of the drain closure element, or at least one region of the drain closure element surrounds at least one region of the positioning element.

[0027] Furthermore, the features and advantages described in connection with the filter according to the invention and its respective advantageous embodiments apply to each other accordingly, and vice versa. The individual features and advantages can, of course, be combined with one another, potentially resulting in further advantageous effects that go beyond the sum of the individual effects. Brief description of the drawings

[0028] Further advantages, features, and details of the invention will become apparent from the following description, in which exemplary embodiments of the invention are explained in more detail with reference to the drawing. The person skilled in the art will expediently consider the features disclosed in the drawing, the description, and the claims individually and combine them into meaningful further combinations. The following are shown schematically: Figure 1 shows a longitudinal section of a liquid filter for an internal combustion engine of a motor vehicle according to a first embodiment; Figure 2 shows an isometric detail view of a housing cover of the filter made of Figure 1 in the area of ​​a drain opening for the liquid; Figure 3 an isometric detail view of an exemplary filter element of the filter made of Figure 1in the area of ​​a filter element drain opening for the liquid; Figure 4 a longitudinal section of a partial area of ​​a liquid filter according to a second, non-inventive embodiment; Figure 5 a longitudinal section of a partial area of ​​a liquid filter according to a third, non-inventive embodiment.

[0029] In the figures, identical components are labelled with the same reference symbols. embodiment(s) of the invention

[0030] In Figures 1 to 3 A filter 10 for liquid, for example oil or fuel, is shown in a longitudinal section and in detailed views of an internal combustion engine of a motor vehicle according to a first embodiment. The filter 10 is arranged in a liquid circuit, for example an engine oil circuit or a fuel circuit, of the internal combustion engine.

[0031] The filter 10 comprises a filter housing 12, of which in Figure 1Only the housing cover 14 is shown. The housing cover 14 is screwed into a main housing of the filter housing 12 (not shown) at the bottom. The filter housing 12 has a liquid inlet for the liquid to be cleaned and a liquid outlet for cleaned liquid, both of which are not shown in the figure.

[0032] Furthermore, the filter housing 12 has a drain 16 at the lowest point of the housing cover 14, through which liquid can be drained from the interior of the filter housing 12, for example, for maintenance purposes. A filter element 18, designed as a circular filter element, is arranged in the filter housing 12 such that it separates the liquid inlet from the liquid outlet. The filter element 18 is detachably attached to the housing cover 14 in a manner not relevant here.

[0033] The filter element 18 has a filter medium 22 that is continuous around an imaginary axis 20 and surrounds an interior space 24. During operation of the filter 10, the liquid flows through the filter element 18 from radially outside to radially inside, so that the interior space 24 forms the clean side of the filter element 18 and the interior of the filter housing 12 surrounding the filter element 18 forms the dirty side.

[0034] When the terms "axial," "radial," "coaxial," "circumferential," or similar are used below, they refer, unless otherwise stated, to axis 20. In the illustrated embodiment, axis 20 coincides with an element axis of the filter element 18, an installation axis of the filter element 18 in the housing cover 14, a housing axis of the filter housing 12, and a connecting axis of a drain closure element 26 of the drain assembly 16 with the housing cover 14. Therefore, for the sake of simplicity, reference will always be made to axis 20 in the following. It is understood that when the filter 10 is removed, axis 20 corresponds to the axes mentioned above.

[0035] At one of the outlet arrangements 16 facing, in Figure 1An end plate 28 is attached to the lower end face of the filter element 18. The end plate 28 extends over the entire end face of the filter element 18. In the area of ​​the element's interior 24, the end plate 28 is axially stepped towards the element's interior 24. There, the end plate 28 has a coaxial filter element idle opening 30.

[0036] The filter element idle opening 30 is formed on the outer side of the end disk 28, which faces axially away from the element interior 24, in a positioning element 32.

[0037] The positioning element 32 has the form of a sleeve, which is circularly cylindrical on its radially inner circumferential side. On its radially outer circumferential side, the positioning element 32 is toothed and thus forms a plurality of circumferentially spaced positioning sections 34 for a filter element seal 36. The positioning sections 34 each extend parallel to the axis 20.

[0038] The filter element seal 36 is designed as a sleeve in the form of a circular hollow cylinder, which is arranged coaxially. With its radially inner circumferential side, the filter element seal 36 does not seal radially, but rather with circumferential interruptions against the respective positioning sections 34, and is thus positioned.

[0039] The filter element seal 36 has a filter element sealing surface 38 on each of its axially opposite end faces. The filter element sealing surfaces 38 are exclusively axially oriented. The filter element seal 36 therefore has no sealing surface acting in a radial direction.

[0040] The filter element seal 36 projects beyond the positioning element 32 in the axial direction. The filter element seal 36 is made of an elastomer and is elastic in the axial direction.

[0041] With its filter element sealing surface 38 facing axially towards the interior of the element 24, the filter element seal 36 rests against a filter element sealing surface 40, acting as a seal in the axial direction. The filter element sealing surface 40 surrounds the positioning element 32 radially and circumferentially on the outer surface of the end disk 28, which faces away from the interior of the element 24. The filter element sealing surface 40 is also oriented exclusively in the axial direction.

[0042] The drain assembly 16 comprises the drain closure element 26 and a receptacle 42 for the drain closure element 26, which is located in the lower part of the housing cover 14. The receptacle 42 is formed integrally with the housing cover 14.

[0043] The receptacle 24 comprises a coaxial connecting section 44 in the form of a circular cylindrical sleeve on the outside of the housing cover 14. On its radially inner circumferential side, the connecting section 44 has an internal thread 46 of a screw connection 48, which interacts with a corresponding external thread 50 on the radially outer circumferential side of the drain closure element 26.

[0044] On the inner side of the housing cover 14, facing axially towards the filter element 18, the receptacle 42 has a coaxial sealing section 52 in the form of a hollow circular cylinder. The sealing section 52 forms an ambient sealing surface 54 on its radially inner circumferential side, which is directed radially inwards. An ambient sealing ring 56 rests against the ambient sealing surface 54, providing a radial seal. The ambient sealing ring 56 is arranged in a sealing groove in the radially outer circumferential side of the drain plug element 26.

[0045] On the side facing axially away from the base of the housing cover 14, the sealing section 52 is bent radially inwards by 90° and forms an end wall 58 there. Several radially outer drain openings 60 are arranged circumferentially distributed in the end wall 58.

[0046] Radially within the radially outer drain openings 60, the end wall 58 is bent at a 90° angle from the base of the housing cover 14 and transitions into a separating section 62. The separating section 62 has the shape of a coaxial hollow circular cylinder. The separating section 62 thus forms a circumferentially continuous partition. The separating section 62 surrounds a coaxial radially inner drain opening 64. The separating section 62 thus separates the radially outer drain openings 60 from the radially inner drain opening 64.

[0047] In the region of its edge axially facing away from the end wall 58, the separating section 62 is flared in a funnel shape on its radially inner circumferential side. The axial extent of the separating section 62 is smaller than the axial extent of the filter element seal 36 in its relaxed state. During axial compression of the filter element seal 36, the separating section 62 can act as a stop. The inner diameter of the separating section 62 is larger than the outer diameter of the filter element seal 36. When the filter element 18 is installed, the separating section 62 surrounds the filter element seal 36 without touching it. Thus, no radial sealing effect occurs between the separating section 62 and the filter element seal 36.

[0048] The end face of the drain closure element 26, which faces axially towards the interior of the filter housing 12, is flat and perpendicular to the axis 20. At its center, the end face has a conical coaxial centering element 66. The maximum outer diameter of the centering element 66 is smaller than the inner diameter of the filter element drain opening 30. The centering element 66 can thus engage in the filter element drain opening 30 to center the filter element 18 accordingly.

[0049] Radially outside the centering element 66, the end face of the drain closure element 26 forms a circumferentially continuous sealing surface 68. The diameter and radial extent of the sealing surface 68 correspond to the corresponding, spatially lower filter element sealing surface 38 of the filter element seal 36. The sealing surface 68 is oriented exclusively in the axial direction. When the filter 10 is installed, the filter element sealing surface 38 of the filter element seal 36 rests against the sealing surface 68, sealing exclusively in the axial direction.

[0050] The filter element seal 36, the filter element sealing surfaces 38, the filter element sealing surface 40 and the sealing surface 68 form a filter element sealing device 69.

[0051] Radially outside the sealing surface 68, the end face of the drain closure element 26 forms an annular covering surface 70, with which the radially outer drain openings 60 are covered and closed when the filter 10 is installed.

[0052] A radial outer diameter of the end face of the drain closure element 26 corresponds to a radial inner diameter of the sealing section 52 of the receptacle 42.

[0053] The filter element seal 36 separates the clean side of the filter element 18 from the dirty side. The separating section 62, in combination with the labyrinthine arrangement of the recess in the end disc 28, prevents coarse dirt, such as chips, from entering the area of ​​the filter element seal 36 from the dirty side and impairing its sealing effect.

[0054] To drain the liquid from the filter 10, for example for maintenance purposes, the drain plug element 26 is unscrewed from the receptacle 42. This releases the filter element seal 36 on the side facing the sealing surface 68, opening the connection between the filter element drain opening 30 and the radially inner drain opening 64, allowing liquid to drain from the clean side.

[0055] Furthermore, the cover surface 70 exposes the radially outer drainage openings 60, so that the liquid can drain from the pipe side through the radially outer drain openings 60.

[0056] Furthermore, the cover surface 70 exposes the radially outer drainage openings 60, so that the liquid can drain from the pipe side through the radially outer drain openings 60.

[0057] In the embodiment shown, the positioning element 32 and the drain closure element 26 with the separating section 62 are arranged to overlap axially. A portion of the drain closure element 62, in the form of the separating section 62, encloses a portion of the positioning element 32. The positioning element 32, in the area of ​​the separating section 62, at least partially extends into the drain closure element 62, which radially surrounds the positioning element 32.

[0058] To replace the filter element 18, the housing cover 14 is unscrewed from the housing body. The filter element 18, together with the filter element seal 36, can then be pulled out of the housing cover 14 in an axial direction and replaced.

[0059] The assembly of filter 10 is carried out in reverse direction.

[0060] In Figure 4A filter 10 is shown according to a second, non-inventive embodiment. Those elements which correspond to those of the first embodiment from Figures 1 to 3 Similar items are marked with the same reference symbols.

[0061] The second embodiment differs from the first embodiment in that a filter element seal 136 in the form of an O-ring seal acts as a radial seal. The filter element seal 136 is arranged in a circumferentially continuous sealing groove 172 on a radially outer circumferential side of a sleeve-shaped coaxial positioning element 132. Unlike the positioning element 32 from the first embodiment, the positioning element 132 does not have any interrupted positioning sections.

[0062] One base of the sealing groove 172 forms a radially oriented filter element sealing surface 140. The corresponding radially inner circumferential side of the filter element seal 136 forms a radially inner sealing surface 138. The radially inner filter element sealing surface 138 is radially oriented and abuts the filter element sealing surface 140 in a radially sealing direction.

[0063] On the end face axially facing the filter element 18, the drain closure element 126 has a centering element 166 in the sealing section 52 in the form of a coaxial circular cylindrical centering opening. In the area of ​​its open side facing the filter element 18, the centering element 166 is widened in a funnel shape.

[0064] The radially inner circumferential side of the sealing section 52, which surrounds the centering element 166, forms a sealing surface 168. The sealing surface 168 is directed radially inwards. The radially outer filter element sealing surface 138, which is located on the radially outer circumferential side of the filter element seal 136, abuts the sealing surface 168 in a radially sealing direction.

[0065] The filter element seal 136, the filter element sealing surfaces 138, the filter element sealing surface 140 and the sealing surface 168 form a filter element sealing device 169.

[0066] The outer diameter of the positioning element 132 corresponds approximately to the diameter of the centering element 166. The centering element 166 extends axially to approximately the level of the circumferential groove with the surrounding sealing ring 56.

[0067] In the second embodiment, the end wall 58 and the separating section 62 according to the first embodiment are omitted. Instead, a radially outer drain opening 160 extends continuously around the circumference and is separated from a radially inner drain opening 164 by the positioning element 132. With the filter element 18 and the drain closure element 126 removed, the radially outer drain opening 160 and the radially inner drain opening 164 form a single continuous opening.

[0068] With the drain plug element 126 installed, the radially outer drain opening 160 is closed by a circumferentially continuous, inclined cover surface 170. The cover surface 170 is located on the radially outer circumferential side of the drain plug element 126. Viewed axially, the cover surface 170 is situated between the end face of the drain plug element 126 facing the filter element 18 and the circumferential groove with the surrounding sealing ring 56. The receptacle 42 for the drain plug element 126 is cylindrically shaped at least radially coaxially on the side facing the interior of the filter housing 12.

[0069] Optionally, the drain plug element 126 has an external seal 174 in the form of a coaxial O-ring seal on the side of the external thread 50 that faces axially away from the circumferential groove with the environmental sealing ring 56. The external seal 174 is arranged in a corresponding circumferentially continuous sealing groove in the radially outer circumferential side of the drain plug element 126. The external seal 174 seals radially against a corresponding sealing surface on the radially inner side of the connection section 44 towards the environment. The external seal 174 can be omitted during the initial assembly of the drain plug element 126 in the housing 14. Only after the drain plug element 26 has been removed for the first time and subsequently screwed back in can the external seal 174 optionally be installed to improve the sealing of the screw connection 48 to the environment.

[0070] In Figure 5A filter 10 according to a third, non-inventive embodiment is shown. Those elements which correspond to those of the first embodiment from the Figures 1 to 4 Similar elements are designated with the same reference symbols, similar elements with a reference symbol number increased by 200.

[0071] The third embodiment differs from the second embodiment in that an end body 28 of the filter element 18 comprises an additional sleeve 200. This sleeve 200 is firmly connected to the end body 28, for example by a snap-fit ​​connection, and forms a drain opening 264.

[0072] A filter element seal 236 in the form of an O-ring seal is accommodated in the sleeve 200 and acts in a radial direction. The separate production of the sleeve 200 makes the filter element 12, and in particular the end body 28, simpler and cheaper to manufacture, since the end body 28 can be produced in one demolding direction, for example, by injection molding.

[0073] A filter element seal 236 is arranged in a circumferentially continuous sealing groove 272 on a radially outer circumferential side of the sleeve 200, the sleeve 200 being designed as a sleeve-shaped coaxial positioning element 232. In contrast to the positioning element 32 from the first embodiment, the positioning element 232 does not have any interrupted positioning sections. The corresponding radially inner circumferential side of the filter element seal 236 forms a radially inner sealing surface 238.

[0074] The end body can be axially inserted into the filter element 18 in a space-saving design.

[0075] The centering and positioning of the third version of the Fig. 5 This is done according to the second version. Fig. 4 .

Claims

1. A filter (10) for liquid, in particular oil or fuel, in particular of an internal combustion engine, with at least one filter housing (12) in which a filter element (18) is disposed, wherein the filter element (18) features at least one filter element idle opening (30) and the filter housing (12) features a discharge opening (60, 64) for liquid, which are closed by a discharge closure element (26), wherein the filter element (18) features at least one filter medium (22) which circumferentially surrounds an element interior (24) with respect to an imaginary axis (20) and is connected to an end body (28) at at least one axial front face with respect to the axis (20), wherein the end body (28) of the filter element (18) features a filter element idle opening (30) surrounding the axis (20), which is connected to the element interior space (24), and at least one filter element sealing surface or filter element seal surface (38, 40, 68) of a filter element sealing device (69) which circumferentially surrounds the filter element idle opening (30) continuously and with which the at least one filter element idle opening (30) can be closed when the filter (10) is assembled, wherein the filter element sealing device (69) features at least one seal (36) that is circumferentially continuous with respect to the axis (20), the seal being attached to the filter element (18), and closes the filter element idle opening (30) and the discharge opening (60, 64) with a discharge closure element (26), wherein the discharge closure element (26) features for at least one discharge opening (60, 64) of the filter housing (12) of the filter (10) at least one sealing surface (68) of the filter element sealing device (69) for closing the filter element idle opening (30) of the filter element (18) of the filter (10), which surrounds an imaginary axis (20) circumferentially in a continuous manner, wherein the discharge closure element (26) can be connected to or disconnected from the filter element (18) and / or the filter housing (12) relative to the axis (20) by means of a rotary and / or plug-in movement, characterized in that the at least one sealing surface (68) is freely accessible in the axial direction from an axial front face with respect to the axis (20) and that faces or can face the interior space of the filter housing (12) for closing the at least one discharge opening (60, 64).

2. The filter (10) for liquid according to claim 1, characterized in that an axial extension of a separating section (62) is smaller than an axial extension of a filter element seal (36) in a relaxed state, wherein, upon axial compression of the filter element seal (36), the separating section (62) serves as a stop, wherein the internal diameter of the separating section (62) is greater than the external diameter of the filter element seal (36).

3. The filter (10) for liquid according to claim 1 or 2, characterized in that a positioning element (32) and the discharge closure element (26) are disposed in an overlapping in the axial direction in the assembled state, wherein a region of the discharge closure element (26) encloses a region of the positioning element (32) or a region of the positioning element (32) encloses a region of the discharge closure element (26).

4. The filter (10) according to one of the preceding claims, characterized in that the at least one seal (36) of the filter element sealing device (69) of the filter element (18) acts as an axial seal with respect to the axis (20).

5. The filter (10) according to one of the preceding claims, characterized in that the at least one seal (36) of the filter element sealing device (69) of the filter element (18) is disposed on a sleeve-like positioning element (32) which extends axially on the outside of the end body (28) with respect to the axis (20) and which at least partially contributes to forming the filter element idle opening (30).

6. The filter (10) according to one of the preceding claims, characterized in that the at least one seal (36) of the of the filter element (18) is arranged radially outside the sleeve-like positioning element (32) with respect to the axis (20).

7. The filter (10) according to one of the preceding claims, characterized in that the at least one sealing surface (68) of the discharge closure element (26) is directed axially with respect to the axis (20).

8. The filter (10) according to one of the preceding claims, characterized in that the at least one sealing surface (68) of the discharge closure element (26) is disposed radially inside or radially outside a centering element (66) relative to the axis (20), which centering element can cooperate with a positioning element (32) of the filter element (18).

9. The filter (10) according to one of the preceding claims, characterized in that radially outer discharge openings (60) closable or openable by means of a cover surface (70) of the drain closure element (26), so that a liquid can be discharged through radially outer discharge openings (60) at the bottom of a housing cover (14).