WO2022003165A2

WO2022003165A2 - Filter element and liquid filter

Info

Publication number: WO2022003165A2
Application number: PCT/EP2021/068356
Authority: WO
Inventors: Günter Jokschas
Original assignee: Mann+Hummel Gmbh
Priority date: 2020-07-03
Filing date: 2021-07-02
Publication date: 2022-01-06
Also published as: DE112021003595A5; WO2022003165A3; DE102020117620A1

Abstract

The invention relates to a filter element (70) having a filter medium (12) which is folded in a star-shaped manner and which annularly surrounds a longitudinal axis (14), a first end disc (20) which seals a first end face (18) of the filter medium (12), a second end disc (24) which seals a second end face (22) of the filter medium (12), and a central tube (30) which extends from the first end disc (20) to the second end disc (24), wherein at least one axial fixing element (38) and at least one rotary stop (40), which is designed to secure the filter element (10) to a first housing element (76), of a securing structure (36) protrude beyond the first end disc (20) so as to face away from the filter medium (12). The invention additionally relates to a liquid filter (68) comprising such a filter element (70) and a filter housing (72), a first housing element (76) having a holding structure (75) on which the filter element (70) is held by the securing structure (36).

Description

Filter element and liquid filter

Technical area

The invention relates to a filter element having a star-shaped folded filter medium which surrounds a longitudinal axis in a ring, a first end plate which seals a first end face of the filter medium, and a second end plate which seals a second end face of the filter medium. The invention also relates to a liquid filter with such a filter element and a filter housing.

State of the art

Generic filter elements and liquid filters are known from the prior art.

WO 2012/116869 A1 describes a filter device with an annular filter element which is connected to a cover of a filter housing with the aid of a closure part. End faces of the filter element are each sealed by end plates. A central tube is integrated into the filter element. In an interior of the filter element, locking webs are formed on the inside of the central tube. The locking webs are used to connect the filter element to the closure part.

A filter with a round filter cartridge is known from EP 1 093 840 A2. The filter cartridge has a star-shaped folded filter paper with a front end disk. A valve body of a filter bypass valve is mounted in a support tube of the filter cartridge. The support tube can protrude from one of the end disks and be connected to a cover of a filter housing with the aid of a bayonet lock. The other end plate can be slipped onto an outlet connection piece, the support tube ending in the interior of the filter cartridge at a distance from the end plate and the outlet connection piece. It is an object of the invention to provide a stable and easy to assemble filter element.

Disclosure of the invention

The object is achieved by a filter element having the features specified in claim 1 and a liquid filter according to claim 14. Preferred embodiments are specified in the respective subclaims and the description.

Filter element according to the invention

According to the invention, a filter element is provided. The filter element can be designed to filter liquid, in particular oil.

The filter element has a star-shaped folded filter medium. The filter medium surrounds a longitudinal axis in an annular manner. In other words, the filter medium is folded in a zigzag shape and arranged around the longitudinal axis. The filter medium encloses an interior space of the filter element circumferentially. The filter medium can be obtained from a filter paper by folding. The filter medium can be flowed through from the radial outside to the radial inside. Directional information such as axial or radial refer to the longitudinal axis.

The filter element has a first end plate and a second end plate. The first end plate seals a first end face of the filter medium. The second end plate seals a second end face of the filter medium. The end plates thus prevent fluid to be filtered from entering the folds at the end faces, bypassing the filter medium. The two end disks are typically ring-shaped, in particular circular ring-shaped.

According to the invention, the filter element has a central tube which extends from the first to the second end disk. The central tube supports the two end plates. The central tube can in particular prevent axial compression of the filter element. Forces acting during the assembly and / or operation of the filter element can be absorbed or diverted through the central tube. The central tube can be positively and / or cohesively connected to the two end plates. In particular, the central tube can be embedded in sections in the end disk. The central tube is basically arranged in the interior of the filter medium. The central tube is typically on the inside of the filter medium. The central tube can prevent the filter medium from collapsing when pressure is applied. The central tube typically has through openings for the fluid. The central tube can have webs running axially and in the circumferential direction, between which the average openings are designed as windows.

According to the invention, a fastening structure is also provided for fastening the filter element to a first housing element. The fastening structure is designed with at least one axial fixing element and at least one rotary stop, the rotary stop preferably being formed directly on the fixing element. In principle, the at least one fixing element and preferably also the at least one rotary stop are designed to be rigid. The at least one rotary stop can define a rotary end position in which the at least one axial fixing element holds the filter element in the axial direction on the first housing element. For this purpose, the axial fixing element can engage behind a fold element of the first housing element. In the rotational end position, the rotational stop can rest against the folding element. The fastening structure preferably has several, in particular two, axial fixing elements which are arranged one after the other in the circumferential direction and are each formed in the shape of a circular arc and can each be brought into engagement with a fold element of the first housing element. Each fixing element preferably has a rotary stop. By moving the filter element into an initial rotational position relative to the first housing element, the attachment of the filter element to the first housing element can be released. Likewise, the filter element and the first housing element can be moved closer to one another in the axial direction for assembly in the initial rotational position. The end of rotation position is then set up for fixing. In other words, the fastening structure can be designed as a bayonet lock.

The fastening structure protrudes over the first end disk, facing away from the filter medium. In other words, the fastening structure protrudes over the first End disk. This makes it easier to recognize the functioning of the fastening structure for the assembly of the filter element and to set up the initial rotational position and the rotational end position in order to fasten the filter element to the first housing element.

A first opening to an interior space of the filter element can be formed on the first end disk. A first sealing device for sealing the first end disk from a first housing socket that can be inserted into the first opening is preferably formed on the first opening. The sealing device prevents fluid from flowing through between the first housing connector and the first end plate. The first housing socket can be a pipe socket for introducing or discharging fluid into or out of the interior. The first housing connector is preferably a blind connector which tightly closes the first opening. A flow through the first end disk in the area of the first opening is then completely prevented in the assembled state.

In an advantageous embodiment, the fastening structure is formed in one piece with the central tube. The filter element can thus consist of a particularly small number of separate parts. In addition, a particularly stable filter element can be obtained in this way. The central tube can be connected to the first end plate in a fluid-tight manner. For this purpose, the central tube can be designed to be closed in the form of a ring in the contact area with the first end disk. A sealing element is preferably held radially on the inside on the central tube. The sealing element can encompass the first opening. The central tube and, if applicable, the sealing element can be components of the first sealing device.

In an alternative embodiment it is provided that the fastening structure is formed on a fastening insert. This can simplify the positioning of the filter element.

In a first further development of this embodiment, the fastening insert is locked to the central tube. In this way, a particularly stable connection between the fastening insert and the central tube can be obtained. In an alternative development of this embodiment, the fastening insert is locked to the first end plate. The fastening insert can then be designed to be particularly compact. In this case, the first end disk is preferably designed as a dimensionally stable plastic end disk.

The fastening insert can be connected to the first end plate in a fluid-tight manner. For this purpose, the fastening insert can have an annularly closed sealing section. A sealing element is preferably held radially on the inside on the fastening insert, in particular its sealing section. The sealing element can encompass the first opening. The fastening insert and, if applicable, the sealing element can be components of the first sealing device.

In an advantageous embodiment, a second opening to an interior space of the filter element is formed on the second end disk. The second opening can allow fluid to flow into or preferably out of the interior space. A second sealing device for sealing the second end disk from a second housing connector is preferably formed at the second opening. The second housing socket is typically flow through for the fluid to be filtered. The second housing connector can be an inlet connector or preferably an outlet connector.

In a first further development of this embodiment, the central tube is connected to the second end plate in a fluid-tight manner. In addition, an annularly closed connection section of the central tube can protrude away from the filter medium over the second end disk. A further sealing element can be held on the connection section. In particular, a one-piece central tube can protrude on both end faces of the filter medium, on the one hand with the fastening structure and, on the other hand, with the connection section over the first or second end disk in the axial direction. In this way, a particularly stable filter element can be obtained.

In an alternative development, it is provided that a connection insert is connected to the second end plate in a fluid-tight manner. This can be the manufacture of the filter element simplify. The connection insert can have an annularly closed connection section. The connection section of the connection insert preferably projects away from the filter medium over the second end plate. A further sealing element can be held on the connection section. The connection section can be latched to the central tube or the second end plate.

It is advantageously provided that the first end disk and / or the second end disk is a film end disk. Foil end disks allow the filter element to be positioned in a particularly cost-effective manner. The film end disk can consist of a material which swells under the action of heat and which contains, in particular, nitrile rubber. For connection to the filter medium, the film end cap can be placed on the corresponding face of the folded filter medium and heated. The film material swells, penetrates into the spaces between the folds and connects to the filter medium in a sealing manner. With the film end disk, a stabilizing end disk that seals the end faces of the filter medium can be implemented in a simple manner. At the same time, the film end disk can also form a radially inner seal at an opening in the end disk. If a film end disk is provided, the fastening structure or the connection section is preferably formed in one piece with the central tube or a fastening insert or connection insert is held on the central tube. A film end disk would itself not be suitable as a carrier for connecting means due to its lower stability, for example compared to an end disk made of a dimensionally stable plastic. By means of the fastening structure arranged directly or indirectly on the central tube, it is also possible to detachably connect and hold a filter element with foil end plates with a housing element.

Alternatively, the first and / or the second end disk can be designed as an injection-molded or cast-on or foamed-on end disk. In this way, a particularly stable end disk can be obtained. This is advantageous if a fastening insert or connection insert is held directly on the end plate. Liquid filter according to the invention

A liquid filter with an above-described filter element according to the invention and a filter housing also falls within the scope of the present invention. The liquid filter can be an oil filter, in particular for filtering the lubricating oil of an internal combustion engine. A first housing element of the filter housing has a folded structure on which the filter element is held with the fastening structure. A fold element of the fold structure can be provided for each of the fixing elements. The fixing elements and the respectively assigned fold elements can engage behind one another. The fixing elements and folding elements can advantageously be designed as mutually corresponding elements of a bayonet connection.

A first housing connector of the filter housing preferably closes a first opening on the first end plate. For this purpose, the first housing socket can engage in a sealing manner in the first opening of the first end plate. A first sealing device is preferably provided on the first end disk for sealing against the first housing socket. The first housing socket is particularly preferably designed as a blind socket that cannot flow through. A flow through the first end disk can be prevented in this way.

The first housing connector is basically held on the first housing element. The first housing connector can be formed in one piece with the first housing element. Alternatively, the first housing connector can be connected to the first housing element in a materially bonded manner, for example glued or welded. Alternatively, the first housing connector can be attached to the first housing element in a form-fitting manner, for example it can be latched to the first housing element.

The first housing element can be a housing cover. Typically the filter housing comprises a second housing element. The second housing element can be a filter bowl. A fluid inlet and / or a fluid outlet can be formed on the second housing element. A second housing connector can also be provided on the second housing element. The second housing connector can be connected in a sealing manner to a second opening on the second end plate. Brief description of the drawings

Further features and advantages of the invention emerge from the following detailed description of exemplary embodiments of the invention, from the patent claims and from the figures of the drawing, which show details according to the invention. The features mentioned above and further elaborated can be implemented individually or collectively in any desired, expedient combinations in the case of variants of the invention. The features shown in the drawing are shown in such a way that the special features according to the invention can be made clearly visible. Identical parts are provided or designated with the same reference numerals.

In the drawing show:

1 shows a filter element according to the invention with a fastening insert which is latched onto a central tube and which has a fastening structure which protrudes over a first end disk, in a schematic perspective view;

FIG. 2 shows the filter element from FIG. 1 in a schematic sectional view; FIG.

3 shows a filter element according to the invention with a fastening insert which is latched onto a first end disk and which has a fastening structure which protrudes over the first end disk, in a schematic sectional view;

4 shows a liquid filter according to the invention with one according to the invention

Filter element, wherein a fastening structure is formed in one piece with a central tube of the filter element, which protrudes over a first end disk and which is held on a folded structure of a first housing element, and wherein a blind socket of the filter housing closes a first opening on the first end disk, in a schematic sectional view ; 5 shows a section of a filter system with a filter housing and an inserted filter element according to the invention, the first housing element having a bypass valve, in a sectional view;

FIG. 6 shows the filter element from FIG. 5 held in the first housing element in a perspective sectional view; FIG.

FIG. 7 shows a plan view of the filter element from FIG. 5;

8 shows a detail from a sectional illustration of a filter element in a first housing element with a valve, the fastening structure and the pleat structure each comprising two elements.

Embodiments of the invention

Figure 1 shows a filter element 10 in a perspective view. In Figure 2, the filter element 10 is shown in a longitudinal section. The filter element 10 has a filter medium 12. The filter medium 12 is folded in a star shape. The filter medium 12 can consist of filter paper. The filter medium 12 surrounds a longitudinal axis 14 of the filter element 10 in an annular manner. An interior space 16 of the filter element 10 is enclosed within the filter medium 12. The filter element 10 can be flowed through from the radial outside to the radial inside. The interior 16 then corresponds to a clean side of the filter element 10.

A first end plate 20 is arranged on the filter medium 12 on a first end face 18. The first end plate 20 seals the folds of the filter medium 12 on the first end face 18. A second end disk 24 is arranged on the filter medium 12 on a second end face 22. The second end plate 24 seals the folds of the filter medium 12 on the second end face 22. The two end disks 20, 24 can be designed as film end disks. The two end plates 20, 24 are each ring-shaped. A first opening 26 is formed on the first end plate 20. A second opening 28 is formed on the second end plate 24. The two openings 26, 28 each open the interior 16 in the axial direction. The filter element 10 has a central tube 30. The central tube 30 extends from the first end disk 20 to the second end disk 24. The central tube 30 can support the two end disks 20, 24 against one another in the axial direction. The central tube 30 can be embedded in the two end disks 20, 24. In the present case, the central tube 30 is designed in the manner of a grid with webs 32 running in the axial direction and in the circumferential direction. Window-like passage openings 34 for the fluid are formed between the webs 32.

The filter element 10 has a fastening structure 36. The fastening structure 36 projects beyond the side of the first end disk 20 facing away from the filter medium 12. In other words, the fastening structure 36 protrudes axially beyond the first end disk 20 on the first end face 18. In the present case, the fastening structure 36 is designed with two axial fixing elements 38 and two rotary stops 40. The axial fixing elements 38 can extend radially outward over a limited circumferential area. The rotation stops 40 can extend in the radial direction. In the present case, the rotary stops 40 each directly adjoin one of the circumferential ends of the fixing elements 38. The axial fixing elements 38 serve to hold the filter element 10 in the axial direction on a first housing element (see FIG. 4). The axial fixing elements 38 are designed as rigid projections. The rotary stops 40 serve to define a rotary end position in which the fixing elements 38 engage behind fold elements of a fold structure of the first housing element. The fastening structure 36 thus forms one half of a bayonet lock. The other half of the bayonet catch can be formed on the first housing element. In this embodiment, the fixing elements 38 and rotary stops 40 are arranged directly around the first opening 26 in the first end disk 20.

In the embodiment of the filter element 10 shown in FIGS. 1 and 2, the fastening structure 36 is formed on a fastening insert 42. The fastening insert 42 is designed in the shape of a ring with a central through opening and extends through the first opening 26 in the first end disk 20. In this embodiment, the fastening insert 42 is latched onto the central tube 30. The fastening insert 42 can have latching hooks 44 for this purpose. The locking hooks 44 extend into the central tube 30. The fastening insert 42 can be supported on the outside of the first end disk 20 in the axial direction. The support is set up as an extension of the central tube 30, so that a direct flow of force can be established between the fastening insert 42 and the central tube 30.

The fastening insert 42 has an annularly closed sealing section 46 between the fastening structure 36 and the latching hooks 44. The sealing section 46 (with its outside) lies against the first end disk 20 in a sealing manner. A sealing element 48 can be held radially inward on the sealing section 46. The sealing section 46 and the sealing element 48 form a first sealing device 50. The first sealing device 50 enables a first housing connector to be inserted into the first opening 26 in a manner sealed with respect to the first end plate 20. The first housing connector can be designed as a closed blind connector.

A connection insert 52 can be arranged on the second end disk 24. The connection insert 52 can be latched onto the central tube 30 with further latching hooks 54. In the axial direction, the connection insert 52 can be supported on the outside of the second end disk 20, preferably as an extension of the central tube 30. The connection insert 52 has an annularly closed connection section 56. On the one hand, the connection section 56 projects in the axial direction over the second end disk 24 away from the filter element 12. On the other hand, the connection section 56 extends into the interior 16. The connection section 56 rests (with its outside) on the second end disk 24 in a sealing manner. A further sealing element 58 can be arranged on the protruding part of the connection section 56. The further sealing element 58 can have a radially inner sealing lip 60 and a radially outer sealing lip 62. The connection insert 52 and the further sealing element 58 form a second sealing device 64 for sealing the second end plate 24 from a second housing connector or a second housing element.

FIG. 3 shows a further embodiment of a filter element 66. The structure and function of the filter element 66 corresponds essentially to the filter element 10 shown in FIGS. 1 and 2 and described above. The differences are primarily explained below. The filter element 66 has a fastening insert 42 with the first end plate 20 locked. For this purpose, latching hooks 44 engage behind the first end plate 20. A connection insert 52 is latched on the filter element 66 with the second end plate 24. For this purpose, further latching hooks 54 engage behind the second end disk 24.

FIG. 4 shows a liquid filter 68, namely an oil filter. The liquid filter 68 has a filter element 70 and a filter housing 72. The fluid to be cleaned flows through the filter element 70 in the radial direction, preferably from the radial outside to the radial inside. Only the left half of the filter housing 72 is shown in FIG. The structure and function of the filter element 70 essentially corresponds to the filter element 10 shown in FIGS. 1 and 2 and described above. The differences are primarily explained below.

In the case of the filter element 70, a fastening structure 36 is formed in one piece with a central tube 30. In other words, the fastening structure 36 is an integral part of the central tube 30. In the area of the first end disk 20, the central tube 30 protrudes from the interior 16, forming the fastening structure 36. Axial fixing elements 38 of the fastening structure 36 engage behind holding elements 74 of a holding structure 75 of a first housing element 76 of the filter housing 72. The filter element 70 and the first housing element 76 are thereby fixed to one another in the axial direction. The holding structure 75 forms the second part of a bayonet lock, the first part of which is given by the fastening structure 36.

A sealing element 48 is arranged on a sealing section 46 of the central tube 30 that is closed in the circumferential direction. The sealing section 46 for its part rests against the first end disk 20 in a sealing manner. The sealing section 46 and the sealing element 48 form a first sealing device 50.

The first housing element 76 has a first housing connector 78. The first housing connector 78 is designed here as a blind connector. The first housing connector 78 has a bottom section 80. The bottom section 80 closes the blind stub so that no flow can flow through it. The dummy connector 78 engages in the first opening 26. The blind connector 78 is sealed off from the first end plate 20 by the first sealing device 50. This prevents a flow through the first end disk 20 at the first opening 26. The blind socket 78 can optionally have a bypass valve.

In the area of the second end disk 24, the central tube 30 has an annularly closed connection section 56. The connection section 56 rests (with its outside) on the second end disk 24 in a sealing manner. The connection section 56 projects beyond the second end disk 24. In other words, the central tube 30 with the connection section 56 protrudes from the interior 16. A further sealing element 58 can be arranged on the axially outer part of the connection section 56. The further sealing element 58 has a radially inner sealing lip 60 and a radially outer sealing lip 62. An annular projection 82 of a second housing element 84 of the filter housing 72 can bear against the outer sealing lip 62 in a sealing manner. A second housing connector 86 can bear against the inner sealing lip 60 in a sealing manner. The second housing connector is preferably an outlet connector. Filtered fluid can flow out of the interior space 16 through the outlet connection.

The first housing element 76 and the second housing element 84 together form the filter housing 72. The housing elements 76, 84 can be screwed together. The first housing element 76 can be designed as a housing cover. The second housing element 84 can be designed as a housing pot. A fluid inlet (not shown in more detail) for unfiltered fluid can be formed on the first housing element 76 or preferably on the second housing element 84.

The filter element 10 (compare FIGS. 1 and 2) and the filter element 66 (compare FIG. 3) can each be arranged in the filter housing 72 like the filter element 70.

FIG. 5 shows a liquid filter 68 with a filter housing 72 and a filter element 90 according to a further exemplary embodiment of the invention. The second housing element 84 forms the receptacle for the filter element 90. To ensure that that only the correct filter element 90 can be used, the second housing element 84 has a central sleeve 88 with flow openings which protrudes into the central tube 30 of the filter element 90. The first housing element 76 is designed as a housing cover which can be detachably connected to the second housing element 84 via a screw thread. A valve 79 is arranged in the first housing element 76.

FIG. 6 shows the filter element 90 held in the first housing element 76 or housing cover. The fastening insert 42 is inserted into the filter element 90 through the first opening 26 in the first end disk 20, which is designed as a film end disk, and is latched onto the central tube 30 by means of latching hooks. The first housing element 76 has a valve 79 which is held in the first housing element 76 by means of a snap connection and partially protrudes into the interior of the filter element 90 through the first opening 26 in the first end plate 20. However, other known connecting means for holding the valve 79 in the first housing element 76 are also possible. The valve 79 forms a bypass valve for bypassing the filter medium 12 above a certain threshold pressure. For example, when the filter medium 12 is added, emergency operation of the liquid filter 68 can be maintained.

FIG. 7 shows a top view of the filter element 90 from FIG. 6. In this exemplary embodiment, the fastening insert 42 has a fastening structure 36 with three axial fixing elements 38. The axial fixing elements 38 are each formed in the shape of a circular arc at the same distance from the center point of the annular fastening insert 42 and have a rotary stop 40 at one end.

In this embodiment, the fastening insert 42 also has a seal holder 49 for receiving an annular sealing element which surrounds the central opening of the fastening insert 42. Seal holder 49 and fastening structure 36 are designed concentrically. The seal holder 49 has a circumferential rib produced in one piece with the fastening insert 42, onto which a cover for axially fixing the ring seal can be applied, in particular clipped, after the ring seal has been inserted. This is a allows easy and secure attachment of the replaceable sealing element. Alternatively, another sealing device can also be used, for example in the form of an injection-molded seal. The seal on the fastening insert 42 is directed radially inward and seals radially against a circumferential wall of the valve 79 on the first housing element 76, so that when the valve 79 is closed, no fluid can bypass the filter medium 12 and pass through the first opening 26 in the first end plate 20 .

FIG. 8 shows a detailed view of the area around the upper end disk 20 of the filter element 90 in the first housing element 76. The first housing element 76 has a valve 79 held in the middle by means of snap hooks. The sealing element in the seal holder 79 seals radially against the valve housing. The fastening structure 36 is arranged radially outside the seal holder. In this embodiment, this comprises two axial fixing elements 38 arranged opposite one another. The axial fixing elements 38 are axially supported on corresponding fold elements 74 of the fold structure 75 on the first housing element 76.

For axial fixing, the axial fixing elements 38 have an undercut which is preferably directed radially outward and which corresponding fold elements 74 on the first housing element 76 can engage behind. The folding elements 74 on the first housing element 76 can be circular arc-shaped webs directed radially inward. In the simplest case, the folded structure 75 on the housing side is rib-like segments protruding radially inward on a circumferential line from the inside of the housing, as shown in FIG. Alternatively, the folding elements 74 can be designed in accordance with the fixing elements 38, with either the folding elements 74 or the axial fixing elements 38 preferably having the rotary stops 40. The folding elements 74 on the first housing element 76 can be introduced into the spaces between the fixing elements 38 by an axial movement and brought into engagement with the fixing elements 38 by a subsequent rotary movement, the rotation being limited by the rotary stops 40. The rotary stops 40 are advantageously arranged in such a way that, during the screwing-in movement for fastening the first housing element 76 to the second housing element 84, the bayonet connection formed from the folding structure 75 and the fastening structure 36 is released and at the opening movement to open the filter housing 72, the bayonet connection is established. Thus, the filter element 90 with the first housing element 76 or housing cover can be removed from or inserted into the second housing element 84 while the connection is released during operation.

The fastening insert 42 described in connection with FIGS. 5 to 8 can also be manufactured in one piece with the central tube 30.

List of reference symbols

Filter element 10, 66, 70, 90 filter medium 12 longitudinal axis 14 interior 16 first end face 18 first end disk 20 second end face 22 second end disk 24 first opening 26 second opening 28 central tube 30 webs 32

Passages 34 Fastening structure 36 Axial fixing element 38 Rotary stop 40 Fastening insert 42 Latching hook 44 Sealing section 46 Sealing element 48 Sealing holder 49 First sealing device 50 Connection insert 52 Further locking hooks 54 Connection section 56 Further sealing element 58 Radially inner sealing lip 60 Radially outer sealing lip 62 Second sealing device 64 Liquid filter 68 Filter housing 72 Retaining elements 74 Holding structure 75 first housing element 76 first housing connector 78 valve 79 bottom section 80 projection 82 second housing element 84 second housing connector 86 sleeve 88

Claims

Expectations

1. having filter element (10, 66, 70)

- A star-shaped folded filter medium (12) which surrounds a longitudinal axis (14) in a ring,

- A first end plate (20) which seals a first end face (18) of the filter medium (12),

- A second end plate (24) which seals a second end face (22) of the filter medium (12),

- A central tube (30) extending from the first end disk (20) to the second end disk (24), wherein a fastening structure (36) with at least one axial fixing element (38) and at least one rotary stop (40) for fastening the The filter element (10) on a first housing element (76) projects away from the filter medium (12) over the first end plate (20).

2. Filter element (10, 66, 76) according to claim 1, characterized in that a first opening (26) to an interior space (16) of the filter element (10) is formed on the first end plate (20).

3. Filter element (10, 66, 70) according to claim 2, characterized in that at the first opening (26) a first sealing device (50) for sealing the first end plate (20) against a first insertable into the first opening (26) Housing stub (78) is formed.

4. Filter element (70) according to one of claims 1 to 3, characterized in that the fastening structure (36) is formed in one piece with the central tube (30).

5. Filter element (70) according to claim 4, characterized in that the central tube (30) is fluid-tightly connected to the first end plate (20), and preferably that a sealing element (48) is held radially inward on the central tube (30).

6. Filter element (10, 66) according to one of claims 1 to 3, characterized in that the fastening structure (36) is formed on a fastening insert (42).

7. Filter element (10) according to claim 6, characterized in that the fastening insert (42) is locked to the central tube (30).

8. Filter element (66) according to claim 6, characterized in that the fastening insert (42) is locked to the first end plate (20).

9. Filter element (10, 66) according to one of claims 6 to 8, characterized in that the fastening insert (42) is connected in a fluid-tight manner to the first end plate (20), and preferably that a sealing element (42) radially on the inside of the fastening insert (42) 48) is held.

10. Filter element (10, 66, 70) according to one of the preceding claims, characterized in that a second opening (28) to an interior space (16) of the filter element (10) is formed on the second end plate (24), preferably wherein an a second sealing device (64) for sealing the second end plate (24) with respect to a second housing connector (86) is formed in the second opening (28).

11. Filter element (70) according to claim 10, characterized in that the central tube (30) is connected in a fluid-tight manner to the second end plate (24), preferably with an annularly closed connection section (56) of the central tube (30) from the filter medium (12) protrudes away over the second end plate (24).

12. Filter element (10, 66) according to claim 10, characterized in that a connection insert (52) is connected to the second end plate (24) in a fluid-tight manner, preferably wherein an annularly closed connection section (56) of the connection insert (52) is separated from the filter medium ( 12) away over the second End plate (24) protrudes.

13. Filter element (10, 66, 70) according to one of the preceding claims, characterized in that the first end plate (20) and / or the second end plate (24) is a film end plate.

14. Liquid filter (68), in particular oil filter, with a filter element (10, 66, 70) according to one of the preceding claims and a filter housing (72), wherein a first housing element (76) has a folded structure (75) on which the filter element (10, 66, 70) is held with the fastening structure (36).

15. Liquid filter (68) according to claim 14, characterized in that the filter element (10, 66, 70) is designed according to claim 2 or 3, and that a first housing connector (78) of the filter housing (72) the first opening (26) locks.