DE102014015613A1 - Hollow filter element and filter with a hollow filter element - Google Patents

Abstract

There are a hollow filter element (10), in particular round filter element, a filter for fluid, in particular oil, fuel, water or an additive, in particular a urea-water solution, in particular an internal combustion engine, in particular of a motor vehicle, and a filter with a hollow filter element (10 ). A filter medium (12) of the hollow filter element (10) surrounds an element interior (18) circumferentially with respect to an element axis (14). A first end body (20) and a second end body (22) are arranged on the filter medium (12) with respect to the element axis (14) axially opposite end faces of the hollow filter element (10). A central tube (24) is arranged in the element interior (18). The central tube (24) is at least axially fixed at one end to the first end body (20) with respect to the element axis (14) by means of a multipart fixing device (28). The central tube (24) is fastened to the other end by means of a connecting device (26) on the second end body (22) by means of at least one snap on both sides at least for axial tensile forces (64).

Description

Technical area

The invention relates to a hollow filter element, in particular round filter element, a filter for fluid, in particular oil, fuel, water or an additive, in particular a urea-water solution, in particular an internal combustion engine, in particular of a motor vehicle, with a filter medium, which has an element interior with respect to an element axis surrounds circumferentially, with a first end body and a second end body, which are arranged on relative to the element axis axially opposite end faces of the hollow filter element to the filter medium, and having a center tube, which is arranged in the element interior.

Furthermore, the invention relates to a filter with a hollow filter element, in particular round filter element, in particular a hollow filter element according to the invention, for fluid, in particular oil, fuel, water or an additive, in particular a urea-water solution, in particular an internal combustion engine, in particular a motor vehicle, with a filter medium which circumferentially surrounds an element interior with respect to an element axis, with a first end body and a second end body disposed on the filter medium at axially opposite end faces of the hollow filter element, and with a center tube disposed in the element interior.

State of the art

From the EP 1 593 419 B1 For example, a filter element for a fluid is known. The filter element has a first end plate and a second end plate. Between the end plates, a pleated filter medium is sealingly arranged. On the one hand, a centering bolt and, on the other hand, a pipe are formed on the second end disk. The tube is sealingly connected to a nozzle. The nozzle has three snap hooks distributed on the circumference, which protrude through a profile region in the first end plate and form an axial securing device together with the first end plate. Within the axial securing a passage for the cleaned fluid is arranged.

The invention has for its object to design a hollow filter element and a filter of the type mentioned, in which a mechanical load on the filter medium to be reduced. In particular, a transmission of mechanical forces, in particular tensile forces, between the end bodies and the filter medium to be reduced.

Disclosure of the invention

This object is achieved with the hollow filter element according to the invention, wherein the central tube is at least axially fixed at one end by means of a multi-part fixing device to the first end body with respect to the element axis and wherein the center tube with the other end by means of a connecting device to the second end body by means of at least one two-sided snap at least for axial tensile forces is mounted force transmitting.

According to the invention, the central tube is held stable by the axial fixation on the first end body at least axially with respect to the element axis and precisely positioned. The connection between the central tube and the second end body by means of the connecting device is force-transmitting at least in the pulling direction axially to the element axis. In this case, the connection by means of at least one two-sided snapping be slightly lagetolerant to compensate for variations in the height of the filter medium such that always a snapping is guaranteed. The filter medium can be mechanically relieved.

The central tube can also be fixed by means of the fixing device in the radial direction and / or circumferential direction on the first end body.

Advantageously, the central tube can be fastened by means of the connecting device to the second end body under at least axial play or without play. With a game, the positional tolerance of the connection between the central tube and the end body can be realized. The central tube can be additionally connected by means of the connecting device in the circumferential direction and / or in the radial direction in a force-transmitting manner with the second end body. The connection in the radial direction and / or circumferential direction can advantageously also be position-tolerant, in particular have a corresponding clearance.

Under tensile force in the context of the invention, a force is understood, which is directed axially to the element axis. With the pulling force, the two end bodies can be pulled away from each other. By means of the fixing device, any tensile force which acts on the first end body can be transmitted to the central tube. The center tube can transmit the tensile force within the positional tolerance of the connecting device to the second end body. Conversely, a tensile force acting on the second end body may be correspondingly transmitted to the first end body. Any force effects between the end bodies and the filter medium can thus be minimized, preferably prevented. In this way it can be avoided that, in particular at high fluid pressures, vibrations and / or pulsations, the respective connection between the filter medium and the end bodies is damaged. In particular, it is thus possible to prevent one or both end bodies from being detached from the filter medium and / or the connection, in particular the filter medium, being torn or otherwise damaged.

Advantageously, the connecting device and / or the fixing device can also be force-transmitting for axial compressive forces. The pressure forces can be directed counter to the tensile forces accordingly.

Advantageously, the filter medium can be firmly and / or tightly connected to at least one of the end bodies. At least one of the connections between the filter medium and the corresponding end body can be materially and / or positively and / or non-positively, in particular by means of an adhesive connection, welded connection, cast connection, clamp connection, locking connection and / or plug connection or in any other suitable manner.

Advantageously, at least one of the end bodies can be made of plastic or have plastic. The connection between the filter medium and the corresponding end body can be done so easily in particular by means of gluing, welding, in particular by means of ultrasonic welding, or casting.

The central tube can advantageously be made of plastic or have plastic. It can be shaped so easily. Furthermore, it can be so easily associated with the plastic end bodies.

End body and / or a central tube made of plastic can also be made simply elastic. In this way, a vibration damping can be improved.

Advantageously, at least one of the end bodies may be an end plate. End discs have a small thickness relative to their radial extent. They can be mounted to save space.

At least one of the end bodies, in particular the first end body, can advantageously have a central opening, in particular an insertion opening. Through the central opening, the center tube can pass. The central opening may additionally serve as a passage for the fluid or have a passage and / or at least with form. The central opening may advantageously be connected to the element interior.

Preferably, the central tube can be introduced from at least one side into the already provided with the end bodies filter medium and snapped with both end bodies.

The filter medium can advantageously be traversed by the fluid from radially inward to radially outward. In this case, the central opening of the end body, in particular the first end body, can serve as an outlet for the cleaned fluid or have or at least form the outlet. Alternatively, the fluid can flow through the filter medium from radially inward to radially outward. In this case, the central opening may serve as an inlet or have the inlet.

Advantageously, one of the end bodies, in particular the second end body, can be closed continuously. In this way, the element interior can be closed with this end body on the corresponding end face.

The fixing device and / or the connection device can advantageously be detachable. In this way, the corresponding end body can be easily separated from the center tube. Alternatively, the fixing device and / or the connecting device can not be detached non-destructively.

The multi-part fixing device can consist of several parts at least before assembling the hollow filter element. In this case, at least one of the parts is on the side of the central tube and one of the parts on the side of the first end body. The parts of the multi-part fixing device may in particular consist of sections of the central tube and of the first end body itself or have such. By means of the fixing device can advantageously be realized a cohesive and / or positive and / or non-positive connection between the central tube and the first end body. In particular, with the fixing device, an adhesive connections, welded joints, clamping connection, latching connection and / or rotary and / or plug connection can be realized.

In the two-sided snapping at least a portion of one of the components involved, in particular the second end body, axially between two axially opposite portions of the other involved component, in particular the center tube, at least held in the axial direction. Advantageously, the connecting device between the second end body and the central tube cohesively and / or be positive and / or non-positive. In particular, in the connection device, a latching connection, clamping connection and / or rotary and / or plug connection can be provided.

Advantageously, the filter medium can surround the element interior circumferentially closed. In this way, the filter medium can be flowed through over the entire circumferential surface of the fluid for filtration.

Advantageously, the filter medium may in particular be folded and / or bent in a zigzag and / or wavy manner. The fold edges and / or bends of the filter media may extend between the two end bodies. Alternatively, the filter medium may also be unfolded or unbent.

The hollow filter element is characterized in that it surrounds the element interior. Advantageously, the hollow filter element may be a so-called round filter element, in particular an oval, conical or conical-oval round filter element. The hollow filter element can also have a different, in particular angular, cross-section.

Advantageously, a peripheral wall of the central tube may be at least partially permeable to the fluid. Advantageously, the center tube may have a lattice-like construction at least in sections. It may have in its peripheral wall corresponding fluid openings through which the fluid can flow from radially outside to radially inside or vice versa.

The center tube may have at least one end, in particular at the end, which faces the end body with the particular central opening, at least one opening. In this way, the interior of the portion of the central tube arranged in the element interior can be connected to a corresponding passage, in particular outlet or inlet, of the end body for the fluid. The central tube can also extend through the corresponding, in particular, central opening of the end body. At least a portion of the central tube may at least form the passage, in particular outlet or inlet. The center tube may also be completely open at this end.

Advantageously, the hollow filter element for the filtration of liquid fluid, in particular an additive for a fuel, in particular urea-water solution can be used. It can also be used to filter other additives, especially in conjunction with oil, fuel or water. The hollow filter element can also be used for filtering other fluids, in particular oil, fuel or water.

The invention is not limited to use in an internal combustion engine of a motor vehicle. Rather, it can also be used in other types of internal combustion engines, in particular industrial engines. It can also be used outside of internal combustion engines, especially in motor vehicles.

In an advantageous embodiment, the fixing device may have on the side of the central tube at least one stop, in particular a stop collar or stop edge, on which at least one section can rest on the sides of the first end body in the axial direction. By the at least one stop, an at least axial movement of the central tube relative to the first end body is limited, preferably prevented.

Advantageously, the at least one stop can extend radially outward from the central tube with respect to the element axis. In this way, the at least one stop in the region of the radially inner peripheral side of the particular annular first end body can rest.

Advantageously, at least one first stop, in particular stop collar or stop edge, abut against the second end body with respect to the element axis axially facing away from the outside, in particular a counter-stop, on the side of the first end body. In this way, a tensile force between the two end bodies can be transmitted simply by means of the at least one first stop. The counter-stop can advantageously be arranged on an end face of a connecting piece of the first end body or at least co-formed by it.

Advantageously, at least one second stop on an axially facing the second end body inside, in particular on a latching stop or Counter stop, rest on the side of the first end body. In this way, the first end body can be stably held between the at least one first stopper and the at least one second stopper. Thus, the center tube can be easily axially fixed to the first end body.

Advantageously, at least one of the stops, in particular the second stop, have at least one latching ring or a latching nose. The at least one locking ring or the at least one latching lug can engage with at least one corresponding latching means, in particular the latching stop, on the side of the first end member. In this way, a simple fixation to the first end body can be carried out even when retrofitting the center tube.

The at least one latching lug or the at least one latching ring may be bevelled on its / its with respect to a direction of insertion of the central tube in a possible particular central opening of the first end body front side. In this way, the center tube can be easily inserted with the latch or the locking ring in the opening. The locking connection can be closed simply by inserting the center tube. The rear side with respect to the insertion direction of the at least one latching lug or the at least one latching ring can engage with the at least one corresponding latching means, in particular the latching stop, on the side of the first end member.

Advantageously, the hollow filter element can have at least one seal, in particular a ring seal. The at least one seal may advantageously be arranged on the side of the first end body. The at least one seal can advantageously circumferentially surround any particular central opening of the first end body. With the at least one seal, a corresponding passage of the opening of the first end body with respect to a corresponding connection region of a housing of the filter can be sealed. The first end body may include a seal chamber or seal groove for the at least one seal. In the sealing chamber, the at least one seal can be stably held and / or positioned. The at least one seal can advantageously act in the radial direction. Alternatively or additionally, the at least one seal can also act in the axial direction.

In a further advantageous embodiment, the fixing device may have on the side of the central tube at least one end section for a body-side seal receiving. The seal receptacle may be open on one end face prior to the assembly of the hollow filter element, in particular prior to installation of the center tube. The at least one seal can be inserted through the open end side into a corresponding end-body-side section of the seal receiver. Subsequently, the central tube can be connected by means of the fixing device with the first end body. With the at least one end portion of the fixing device, the open end side of the seal receptacle can be closed. So the seal can be kept in the seal chamber. It is not necessary to insert the at least one seal on the open peripheral side in the seal receptacle. For this it would be necessary to stretch the at least one seal.

The at least one end portion may advantageously be realized by the at least one stop, in particular the stop collar or stop edge.

The end body side portion of the seal chamber may advantageously be connected directly or indirectly to the first end body. The end-body-side section can advantageously be realized in the region of an end face of the possible connecting piece of the end body. The seal receptacle may be open towards the end face of the connecting piece.

In a further advantageous embodiment, the connecting device may comprise at least one means for a quick connection, in particular latching connection. By means of a quick connection, the central tube can be easily connected to the second end body.

A locking connection can be easily realized with the required position tolerance. The locking connection can for this purpose have a corresponding particular axial play.

Advantageously, the quick connection can be detachable. In this way, the center tube can be easily separated from the second end body. With a locking connection, a detachable connection can be easily realized.

In a further advantageous embodiment, the connecting device may comprise at least one latching element, in particular a latching hook, which may be attached to the second end body and which may enter into a latching connection directly or indirectly with the corresponding end of the central tube.

Advantageously, the central tube may have a corresponding latching receptacle for the at least one latching element. The at least one locking element can be easily inserted into / on the at least one locking receptacle for closing the connecting device.

Advantageously, the latching receptacle can have / be / at least form a latching receiving ring. The locking receiving ring can be advantageously secured by means of struts on the central tube. The struts can advantageously be cross-shaped, in particular at least one receiving cross form. In this way, the latch receiving ring can be stably held in the center tube.

Advantageously, the at least one latching element can be arranged centrally with respect to the element axis, in particular coaxially. Advantageously, an axial section of the at least one latching element may extend approximately parallel, in particular coaxially, to the element axis.

Advantageously, the at least one latching element may have a latching nose or a latching ring. The latching nose or latching ring may be located on the radially outer peripheral side of the axial section of the at least one latching element.

Advantageously, the latching lug or the latching ring can be chamfered on its side facing the first end body in the axial direction. In this way, the locking element can be easily inserted into the locking receptacle.

Advantageously, a single latching element, in particular latching hook, can be provided. The one latching element may have a circumferentially extending latching ring. The locking ring may be circumferentially closed or interrupted. Alternatively, a plurality of detents may be arranged distributed circumferentially on the one latching element. The one locking element can be easily inserted into the locking receptacle.

Advantageously, a plurality of latching elements, in particular latching hook, be arranged distributed circumferentially with respect to the element axis. In this way, the latching hooks can act evenly on the radially inner circumferential side of the central tube, in particular the latching receptacle. Thus, the center tube can be easily fixed in the radial direction. It can also be kept positionally tolerant in the radial direction and / or circumferential direction.

Alternatively, the at least one latching element can engage directly or indirectly from radially outward on the radially outer circumferential side of the central tube or the latching receptacle.

In a further advantageous embodiment, the central tube can have at least one flow channel for the fluid or at least form with it. In this way, the fluid can be passed through the central tube in the interior of the hollow filter element in or out of this.

The central tube can advantageously be hollow and thus form the flow channel. The central tube may have corresponding partitions for a plurality of flow channels.

In a further advantageous embodiment, the central tube can have at least one receptacle for at least one heating element, in particular a heating element, or at least form with it. Advantageously, the central tube can be hollow and form the receptacle for the at least one heating element. The at least one heating element can advantageously serve to heat the fluid. With the at least one heating element, the fluid, depending on the direction of flow of the fluid through the hollow filter element, are heated on the clean side or the raw side of the filter medium. The at least one heating element can advantageously be inserted from the side of the first end body into the central tube.

Advantageously, if appropriate, the at least one flow channel can at least also form the receptacle for the at least one heating element. Alternatively, the receptacle for the at least one heating element can form the at least one flow channel.

Further, the technical problem is solved with the filter according to the invention, wherein the central tube is at least axially fixed at one end to the first end body with respect to the element axis by means of a multipart fixing device and wherein the center tube at the other end by means of a connecting device to the second end body by means of at least one two-sided snap is mounted force transmitting at least for axial tensile forces.

The advantages and features presented above in connection with the hollow filter element according to the invention and its advantageous embodiments apply correspondingly and vice versa for the filter according to the invention and its advantageous embodiments.

Brief description of the drawings

Further advantages, features and details of the invention will become apparent from the following description in which an embodiment of the invention with reference to the drawings is explained in more detail. The person skilled in the art will expediently also individually consider the features disclosed in the drawing, the description and the claims in combination and combine these into meaningful further combinations. They show schematically:

1 a longitudinal half section of a filter element for urea-water solution of an internal combustion engine of a motor vehicle;

2 a transverse half section of the filter element from the 1 along the section line II-II.

In the figures, the same components are provided with the same reference numerals.

Embodiment (s) of the invention

In the 1 and 2 is a filter element 10 of an otherwise not shown filter for a urea-water solution of an internal combustion engine of a motor vehicle. The filter element 10 is designed as a so-called round filter element with a round cross-section. It includes a filter medium 12 , the zigzag and re about an element axis 14 circumferentially closed to a filter bellows 16 folded. Fold edges of the filter medium 12 extend parallel to the element axis 14 , The filter medium 12 For example, it may be a filter paper, filter fabric, or another type of filter medium suitable for filtering urea-water solution.

Whenever hereinafter referred to as "radial,""axial,""coaxial,""circumferential," or the like, this refers to the element axis, unless otherwise stated 14 ,

The filter medium 12 surrounds an element interior 18 closed circumferentially.

At the front sides of the filter bellows 16 is the filter medium 12 tight with a connecting end disk 20 , in 1 above, and a finishing end disk 22 connected below.

In the element interior 18 there is a coaxial center tube 24 , which is between the Anschlussendscheibe 20 and the terminus 22 extends. The center tube 24 is used inter alia for the radial support of the radially inner peripheral side of the filter bellows 16 , The radially inner peripheral side of the filter bellows 16 is due to the folding edges of the filter medium 12 educated.

The connecting end disk 20 , Finish end disc 22 and the center tube 24 are each made of plastic.

With his in 1 lower end is the center tube 24 by means of a connection device 26 with the final end disk 22 connected. The connection device 26 allows a positionally tolerant in the axial direction and in the axial direction of pull force-transmitting attachment of the center tube 24 at the final end disk 22 ,

At the other end is the center tube 24 by means of a fixing device 28 at the connection end disk 20 axially fixed.

The final endshield 22 points to her the Anschlussendscheibe 20 facing side a latching hook 30 which leads to the connection device 26 belongs. The latching hook 30 has an axial section coaxial with the element axis 14 from the final end disk 22 extends away. At the end of the axial section of the latching hook 30 is a locking ring section 32 arranged. The locking ring section 32 extends circumferentially and radially outward. It is integrally connected to the axial section. The locking ring section 32 is on his the terminus 22 bevelled side facing away.

The center tube 24 points to his the terminator 22 facing end a receiving cross 34 on. The recording cross 34 is located inside the center tube 24 , It extends parallel to a plane perpendicular to the element axis 14 , The four arms of the recording cross 34 are each with their radially outer ends in one piece on a respective corresponding radially inner peripheral side with a circumferential strut 36 of the center tube 24 connected. The circumferential strut 36 with the recording cross 34 is to the final stop 22 adjacent.

The radially inner ends of the arms of the receiving cross 34 are each integral with a coaxial latch receiving ring 38 for receiving the latching hook 30 the final end disk 22 connected. The recording cross 34 and the detent ring 38 belong to the connection device 26 ,

An axial distance between the center tube 24 facing inside of the end cap 22 and one of the inside of the end cap 22 facing stop side of the locking ring portion 32 is greater than an axial thickness of the locking receiving ring 38 , In this way, the latch hook 30 and the detent ring 38 positionally tolerant in the axial direction. The axial position tolerance is achieved, for example, in that the latching hook 30 and the detent ring 38 under a game, in 1 indicated by two columns 40 , lock.

The connecting end disk 20 indicates at its the terminating end disk 22 axially facing outside a circular cylindrical connection piece 42 on. The connecting piece 42 is coaxial with the element axis 14 , It surrounds a coaxial insertion opening 44 the connecting end disk 20 for the center tube 24 , The connecting piece 42 is integral with the Anschlussendscheibe 20 connected.

The connecting piece 42 is stepped once at its radially inner peripheral side. An internal cross-section of the connecting piece 42 on his the terminus 22 facing side is larger than on its side facing away. The step on the inner peripheral side of the connection piece 42 forms a detent stop 46 for a connection-side locking ring 48 of the center tube 24 , Of the latching stop 46 and the connection-side locking ring 48 belong to the fixing device 28 ,

The connecting piece 42 has a gasket holder 50 for an O-ring seal 52 , The gasket holder 50 is located on the free end of the connection piece 42 at its radially outer peripheral side. The gasket holder 50 is open radially on the outside.

The end of the final disc 22 axially facing end face of the connecting piece 42 forms a connection-side counterstop 54 for a connection-side stop collar 56 of the center tube 24 , The counter-attack 54 and the connection-side stop collar 56 also belong to the fixing device 28 ,

The center tube 24 pierces the insertion opening 44 , The stop collar 56 located at the end of the final disc 22 remote from the free end of the center tube 24 , It extends radially outward. The stop collar 56 surmounted by the gasket holder 50 and forms its limit on that of the connecting end disk 20 axially facing away side.

The connection-side locking ring 48 has the shape of a circumferentially extending ring, which on its stop collar 56 facing side has a radially and circumferentially extending stop surface. On his the stop collar 56 axially opposite side is the locking ring 48 bevelled. The bevelled side of the latch 48 is located with respect to a plug-in direction 58 of the center tube 24 in the insertion opening 44 front.

An axial distance between the locking ring 48 facing side of the stop collar 56 and the stop surface of the locking ring 48 corresponds to a distance between the locking stop 46 and the counter-attack 54 , In this way, the center tube 24 axially free of play in the axial direction and fixed to the connecting end disk 20 fixed.

A wall section of the central tube 24 within the connecting piece 42 is closed circumferentially. In the area between the connection end disk 20 and the terminus 22 is the center tube 24 structured like a lattice. It has a total of four circular circumferential struts 36 on, each extending circumferentially closed. They are each integral with a plurality of rod-shaped axial struts 60 connected. The axial struts 60 extend parallel to the element axis 14 , They are circumferentially arranged uniformly distributed. Between the axial struts 60 and the circumferential struts 36 are passage openings 62 arranged for the urea-water solution.

In the operation of the filter element 10 The urea-water solution flows through the filter bellows 16 from its raw side, radially outside, to its clean side, radially inside. The purified urea-water solution reaches the element interior 18 and flows through the passage openings 62 in the interior of the center tube 24 , From there, the urea-water solution passes through the section of the center tube 24 which is located inside the connecting piece 42 located, from the filter element 10 out. The center tube 24 thus also serves as a flow channel for the purified urea-water solution.

The O-ring seal 52 seals against a corresponding sealing surface of a filter housing, not shown, of the filter. In the center tube 24 Can be optional from the side of the connecting end disk 20 a heating rod for the urea-water solution can be arranged forth.

For mounting the filter element 10 become the connecting end disk 20 , Finish end disc 22 and the center tube 24 prefabricated as separate components. In addition, the filter bellows 16 from the filter medium 12 folded.

The connecting end disk 20 and the final end screen 22 be on the front sides of the filter bellows 16 tight with the filter medium 12 connected. For this purpose, a plastic welding process can be used.

Subsequently, the O-ring seal 52 in the gasket holder 50 of the connecting piece 42 inserted.

The center tube 24 gets to the end, which is the junction cross 34 has, ahead in the insertion direction 58 through the insertion opening 44 the connecting end disk 20 plugged. The connection-side locking ring 48 with its bevelled side on the radially inner peripheral side of the connecting piece 42 guided.

The locking ring section 32 the final end disk 22 is with its beveled side in the latch receiving ring 38 guided.

As soon as the connection-side stop collar 56 to the counter-attack 54 the connecting end disk 20 stops, locks the connection-side locking ring 48 behind the rest stop 46 of the connecting piece 52 and thus closes the fixing device in several parts 28 , In addition, the locking ring section locks 32 behind the catcher ring 38 and a two-sided snapping the connecting device 26 is realized.

In that the connecting device 26 on the part of the end-stop 22 Snapped on both sides, locked by way of example under an axial play, positional tolerances can be compensated. So can any tensile forces or compressive forces from the Abschlussendscheibe 22 and / or the Anschlussendscheibe 20 attached to the filter medium 12 attack, be kept low. With the center tube 24 can axial tensile forces between the Anschlussendscheibe 20 and the terminus 22 be transferred without this, the filter bellows 16 and the filter medium 12 is charged. Axial tensile forces are exemplary in 1 through arrows 64 indicated. The tight connections between the end faces of the filter bellows 16 and the connecting end disk 20 and terminating disc 22 are mechanically relieved.

QUOTES INCLUDE IN THE DESCRIPTION

This list of the documents listed by the applicant has been generated automatically and is included solely for the better information of the reader. The list is not part of the German patent or utility model application. The DPMA assumes no liability for any errors or omissions.

Cited patent literature

• EP 1593419 B1 [0003]

Claims (8)

Hollow filter element ( 10 ), in particular round filter element, a filter for fluid, in particular oil, fuel, water or an additive, in particular a urea-water solution, in particular an internal combustion engine, in particular of a motor vehicle, with a filter medium ( 12 ), which has an element interior ( 18 ) with respect to an element axis ( 14 ) surrounds circumferentially, with a first end body ( 20 ) and a second end body ( 22 ), with respect to the element axis ( 14 ) axially opposite end faces of the hollow filter element ( 10 ) on the filter medium ( 12 ) are arranged, and with a central tube ( 24 ), which in the element interior ( 18 ) is arranged, wherein the central tube ( 24 ) with one end by means of a multipart fixing device ( 28 ) on the first end body ( 20 ) with respect to the element axis ( 14 ) is at least axially fixed and wherein the central tube ( 24 ) with the other end by means of a connection device ( 26 ) on the second end body ( 22 ) by means of at least one double-sided snapping at least for axial tensile forces ( 64 ) is mounted force transmitting. Hollow filter element according to claim 1, characterized in that the fixing device ( 28 ) on the side of the central tube ( 24 ) at least one stop, in particular a stop collar ( 56 ) or abutment edge, on which at least one section ( 54 ) on the side of the first end body ( 20 ) can rest in the axial direction. Hollow filter element according to claim 1 or 2, characterized in that the fixing device ( 28 ) on the side of the central tube ( 24 ) at least one conclusion section ( 56 ) for an end body-side seal receiver ( 50 ) having. Hollow filter element according to one of the preceding claims, characterized in that the connecting device ( 26 ) at least one means for a quick connection, in particular latching connection ( 30 . 32 . 38 ), having. Hollow filter element according to one of the preceding claims, characterized in that the connecting device ( 26 ) at least one latching element, in particular a latching hook ( 30 ), which on the second end body ( 22 ) and that with the corresponding end of the central tube ( 24 ) directly or indirectly a locking connection ( 30 . 32 . 38 ) can enter. Hollow filter element according to one of the preceding claims, characterized in that the central tube ( 24 ) has at least one flow channel for the fluid or at least forms. Hollow filter element according to one of the preceding claims, characterized in that the central tube ( 24 ) has at least one receptacle for at least one heating element, in particular a heating element, or at least forms with. Filter with a hollow filter element ( 10 ), in particular round filter element, in particular according to one of the preceding claims, for fluid, in particular oil, fuel, water or an additive, in particular a urea-water solution, in particular an internal combustion engine, in particular of a motor vehicle, with a filter medium ( 12 ), which has an element interior ( 18 ) with respect to an element axis ( 14 ) surrounds circumferentially, with a first end body ( 20 ) and a second end body ( 22 ), with respect to the element axis ( 14 ) axially opposite end faces of the hollow filter element ( 10 ) on the filter medium ( 12 ) are arranged, and with a central tube ( 24 ), which in the element interior ( 18 ) is arranged, wherein the central tube ( 24 ) with one end by means of a multipart fixing device ( 28 ) on the first end body ( 20 ) with respect to the element axis ( 14 ) is at least axially fixed and wherein the central tube ( 24 ) with the other end by means of a connection device ( 26 ) on the second end body ( 22 ) by means of at least one double-sided snapping at least for axial tensile forces ( 64 ) is mounted force transmitting.

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