DE102015008694A1 - Hollow filter element of a liquid filter, liquid filter, filter system and adapter element of a hollow filter element - Google Patents

Abstract

A hollow filter element (44) of a liquid filter (14) of a filter system (10) for filtering liquid, a liquid filter (14), a filter system (10) and an adapter element (82) of a hollow filter element (44) are described. The liquid filter (14) is provided for exchangeable mounting on a filter head (12) of the filter system (10). The hollow filter element (44) comprises at least one filter bellows (60) with at least one filter medium (58) which surrounds an element interior (62) circumferentially at least partially relative to an element axis (24). The hollow filter element (44) is designed for exchangeable installation in a housing pot (42) of the liquid filter (14). An adapter element (82) is arranged on one end face of the hollow filter element (44), which has at least one annular radial sealing section (86) which is radially outwardly sealable with respect to the element axis (24) and / or at least one radial seal receptacle (84) for at least one such radial sealing section (86) ) having. The adapter member (82) includes at least one annular axial seal portion (90) axially sealable from the at least one filter media (58) relative to the member axis (24) for sealing against a filter head (12) and / or at least one axial seal retainer (88) for at least one such Axialdichtungsabschnitt (90). Optionally, an outer diameter of the at least one radial sealing portion (86) is at least operatively compressed sealing condition and / or optionally an outer diameter of the adapter member (82) at least in the adjacent region of the at least one Radialdichtungsaufnahme (84) smaller than an inner diameter of the housing pot (42) of the liquid filter (14) at least in the region of an installation opening for the hollow filter element (44).

Description

Technical area

The invention relates to a hollow filter element of a liquid filter of a filter system for filtering liquid, wherein the liquid filter is provided for exchangeable mounting on a filter head of the filter system, the hollow filter element comprises at least one filter bellows with at least one filter medium which surrounds an element interior circumferentially at least partially with respect to an element axis, and the hollow filter element is designed for exchangeable installation in a housing pot of the liquid filter.

The invention further relates to a liquid filter of a filter system for filtering liquid which is or can be interchangeably attached to a filter head and fluidly connected thereto, wherein the liquid filter comprises at least one housing pot and at least one hollow filter element, the at least one hollow filter element interchangeable in which at least one housing pot is or can be arranged and the at least one hollow filter element has at least one filter medium which surrounds an element interior of the hollow filter element circumferentially at least partially with respect to an element axis.

The invention also relates to a filter system for filtering liquid comprising at least one filter head with liquid lines and at least one liquid filter, wherein at least one liquid filter is interchangeably attached to a filter head and fluidly connected thereto, the at least one liquid filter at least one housing pot and at least one hollow filter element includes, the at least one hollow filter element is arranged interchangeably in the at least one housing pot, the at least one hollow filter element at least one filter medium which surrounds an element interior of the hollow filter element with respect to an element axis circumferentially at least partially.

The invention further relates to an adapter element of a hollow filter element of a liquid filter of a filter system for filtering liquid, wherein the liquid filter is provided for exchangeable mounting to a filter head of the filter system and the hollow filter element comprises at least one filter bellows with at least one filter medium, which has an element interior of the hollow filter element with respect to a Element axis circumferentially at least partially surrounds.

State of the art

From the US 20090127198 A1 For example, an end cap is known that has a first disc portion that includes a radially inner portion and a radially outer portion and that defines a longitudinal axis. The end cap further includes a flange disposed between the radially inner and radially outer portions of the first disc member and extending axially along the longitudinal axis in a first direction. The end cap further includes a first sealing member disposed adjacent to the flange. The first seal includes a first portion that is in contact with an axial end face of the first disc part, and a second portion that is in contact with a radial end face of the flange. The end cap further includes a second disc member disposed radially outward of the radially outer portion and a second sealing member disposed adjacent the second disc member, at least a portion thereof axially spaced from the axial end surface of the first disc member in a second direction is spaced along the longitudinal axis against the first direction.

The invention has for its object to design a hollow filter element, a liquid filter, a filter system and an adapter element of the type mentioned, in which liquid filter and hollow filter elements of different designs and / or types of filter heads of the same or similar design can be mounted.

Disclosure of the invention

This object is achieved in that on an end face of the hollow filter element, an adapter element is arranged, which has at least one with respect to the element axis radially outwardly sealable annular Radialdichtungsabschnitt and / or at least one Radialdichtungsaufnahme for at least one such radial sealing portion and which at least one of the at least one Filter medium with respect to the element axis axially sealable annular Axialdichtungsabschnitt for sealing against a filter head and / or at least one Axialdichtungsaufnahme for at least one such Axialdichtungsabschnitt, wherein optionally an outer diameter of the at least one Radialdichtungsabschnitts at least operatively compressed sealing state and / or optionally an outer diameter of the adapter element at least in adjacent region of the at least one radial seal receptacle is smaller than a Inner diameter of the housing pot of the liquid filter at least in the region of an installation opening for the hollow filter element.

According to the invention, an adapter element is provided, which is arranged on an end face of the hollow filter element. With the adapter element, sealing and / or connecting structures on the side of the liquid filter can be adapted to sealing and / or connecting structures on the side of the filter head. In this way, different hollow filter elements and / or different liquid filter with filter heads of the same or similar design can be combined using the adapter element. The adapter element also allows the connection of a so-called housing filter, in which the hollow filter element can be arranged interchangeable in a housing pot, with a filter head, which is also designed for the use of so-called interchangeable filters.

The hollow filter element can be arranged interchangeably in the housing pot. The housing pot can form a two-part housing together with the filter head. The installation opening of the housing pot can be closed with the housing head. Through the installation opening of the two-part housing, the hollow filter element can be removed and replaced. The exchangeable hollow filter element can be combined in this way with the filter head, which can also be provided for a so-called replaceable filter solution. The filter head can be used in this way as a common part for both replaceable filter and housing filter. Thus, a manufacturing effort and thus a cost can be reduced. In addition, it is possible to retrofit or retrofit an existing filter system designed for a replaceable filter with a housing filter with exchangeable hollow filter element.

Exchangeable filters can be realized in particular as so-called spin-on filters. In interchangeable filters, the hollow filter element is not arranged non-destructively interchangeable in a filter housing. The replaceable filter is completely removed from the filter head and replaced. Whereas in a so-called housing filter, the hollow filter element can be removed from the housing pot and replaced. The housing pot of the housing filter can be reused.

At least one radial sealing section and / or at least one axial sealing section can be arranged directly or indirectly on the adapter element. Thus, the at least one radial sealing portion and the at least one Axialdichtungsabschnitt can be manufactured together with the adapter element, mounted and / or replaced if necessary. The adapter element can also be manufactured together with the hollow filter element, mounted and / or replaced if necessary. Thus, at least one sealing section can be replaced simply, preferably automatically, when replacing a hollow filter element.

Advantageously, at least one radial sealing portion and / or at least one Axialdichtungsabschnitt be arranged in at least one corresponding seal receptacle of the adapter element exchangeable or non-destructive separable or be.

Advantageously, at least one Axialdichtungsaufnahme and / or at least one Radialdichtungsaufnahme be realized as a seal groove. A corresponding sealing section, in particular a ring seal, can simply be introduced, positioned and / or held in a sealing groove. The adapter element and / or the hollow filter element with the adapter element can be prefabricated without the at least one corresponding sealing section. The at least one sealing portion can be arranged at a later time in the corresponding gasket receptacle.

At least one radial seal seat, in particular a radial seal groove, for at least one radial seal section may extend circumferentially on a radially outer peripheral side of the at least one adapter element with respect to the element axis. At least one Axialdichtungsaufnahme, in particular a Axialdichtungsnut for at least one Axialdichtungsabschnitt can extend circumferentially on an axial axis with respect to the element end face of the at least one adapter element.

At least one seal portion and / or at least one seal receiver may be circumferentially continuous. In this way it is possible to seal circumferentially coherently.

Alternatively or additionally, at least one radial sealing portion and / or at least one Axialdichtungsabschnitt be firmly connected to the adapter element. In this way, the at least one radial sealing portion and / or Axialdichtungsabschnitt be captively secured to the adapter element. At least one radial sealing section and / or at least one axial sealing section can advantageously be realized as a two-component component with the adapter element. Thus, in the case of the adapter element, sealing properties, in particular elasticity, in the region of the sealing sections with shaping, shape-retaining and / or force-transmitting properties outside the sealing sections can be combined.

At least one radial sealing portion and / or at least one Axialdichtungsabschnitt can also be connected to the adapter element by means of a cohesive and / or positive and / or non-positive connection releasably or non-destructively detachable in another way or be.

The adapter element may advantageously be arranged on the end face of the hollow filter element, which is located on the side of the installation opening of the housing pot. The end face of the hollow filter element with the adapter element can thus be turned towards the filter head. It can serve as a connection side. With at least one radial sealing portion, the adapter element and thus the end face of the hollow filter element can be sealed radially outward against a radially inner peripheral wall, in particular against a local radial sealing surface, of the housing pot. With the at least one radial sealing section, at least one fluid-conducting region between the hollow filter element and the housing pot can be sealed towards the environment and / or towards the filter head.

In a preferred embodiment, the outer diameter of the at least one radial sealing section in the compressed sealing state is smaller than an inner diameter of the housing pot at least in the region of the installation opening for the hollow filter element. In this way, the adapter element with the at least one radial sealing section can be inserted there into the housing pot. An outer diameter of at least one possible sealing receptacle for at least one radial sealing section is preferably smaller than an inner diameter of the housing pot there.

At least one axial sealing portion is axially sealable with respect to the element axis away from the at least one filter medium. With the at least one Axialdichtungsabschnitt the adapter element and thus the end face of the hollow filter element can be sealed against a corresponding particular annular sealing surface on the side of the filter head. At least one fluid-conducting region between the hollow filter element and the filter head can be sealed to the environment and / or to the housing pot with the at least one axial sealing section.

A sealing force required to produce the axial seal by means of the at least one axial sealing section can be advantageously produced by at least one fastening device. The at least one fastening device can be designed or be such that with it the liquid filter can be attached to the filter head or can be. The at least one fastening device can be realized in such a way that with it the hollow filter element and / or the housing pot can be pressed axially against the filter head with respect to the element axis. At least one fastening device can be detachable. In this way it can be solved for maintenance purposes, in particular for an exchange of the liquid filter, in particular hollow filter element.

Advantageously, the at least one adapter element can be designed as a ring body.

Advantageously, an outer diameter of the at least one adapter element can be larger than an outer diameter of the at least one filter bellows. Thus, the at least one adapter element additionally serve as a spacer between the radially inner peripheral side of the peripheral wall of the housing pot and the radially outer peripheral side of the filter bellows. The thus realized annulus may serve as an inlet annulus or outlet annulus for the liquid.

Advantageously, the particular annular adapter element may have at least one step on its radially outer peripheral side. A cross-sectional tapered portion of the smaller outer diameter adapter member on an axial side of the step may be disposed within the housing pot. A cross-section widened portion of the adapter element with a larger outer diameter can be placed on the edge of the housing pot, which surrounds the mounting hole for the hollow filter element. Overall, such an outer diameter of the entire liquid filter can be reduced with housing pot and hollow filter element.

Advantageously, at least one cross-section widened portion of the adapter element with a larger outer diameter at least a housing portion of the housing of the liquid filter at least in the installed state with. The at least one cross-sectional widened portion of the adapter element can be arranged axially between the housing pot and the housing head.

Advantageously, when the filter system is mounted, the element axis coincides with a housing axis of the housing pot and / or a connecting axis of the hollow filter element with the housing pot and / or the liquid filter with the filter head.

The hollow filter element and the housing pot, the hollow filter element and the housing head and / or the housing pot and the housing head can be advantageously connected to one another with the same or different corresponding rotary and / or plug connections. Rotary and / or plug connections can be easily closed and released. Such compounds are in the closed state, in particular in Direction of the connection axis particularly resilient. Rotary and / or plug-in connections can be combined rotary / plug-in connections in which rotational movements and plugging movements are combined to close the connection and rotational movements and tensile movements for opening the connection. It can also be pure rotary joints or pure connectors. It can be advantageously provided screw and / or a bayonet-type connections.

A hollow filter element is characterized by at least one element interior, which is surrounded by a filter bellows with filter medium. The filter medium can be flowed through by the liquid to be cleaned from outside to inside the element interior or vice versa. The element interior has a fluid passage to the outside, through which, depending on the direction of flow, the purified liquid leave the element interior or liquid to be purified can get into this. The filter medium may surround the element interior circumferentially with respect to the element axis. The filter medium may be connected to an end body, in particular an end disk, on at least one end face which is axial relative to the element axis. At least one end body may have at least one passage opening for the element interior.

Advantageously, at least one end body may be connected at one end face of the hollow filter element to the at least one filter medium. In this way, he can contribute to the shaping and / or stabilization of the hollow filter element.

At least one end body can advantageously be connected to the at least one filter medium close to the end face. In this way, the at least one end body can seal the hollow filter element at the corresponding end face.

At least one end body may advantageously be a so-called end disk.

Advantageously, the at least one end body may have at least one passage for the liquid. Through the at least one passage liquid can get into the element interior or out of this. Furthermore, at least one functional component, in particular a fastening element and / or connecting element, coming from the element interior can be guided out of the hollow filter element or coming from the filter head into the element interior through the at least one passage.

Advantageously, at least one end body may have a central passage for the liquid and / or a functional component. At least one end body can be configured as an annular body, in particular annular disk. Additionally or alternatively, at least one end body may have at least one eccentric passage for liquid and / or at least one functional component.

The hollow filter element can advantageously be a round filter element with a round cross section, an oval round filter element with an oval cross section, a flat oval round filter element with a flattened oval cross section, a conical round filter element in which the round cross section in the axial direction becomes a main axis tapered, a conical-oval round filter element in which the oval cross-section tapers in the axial direction at least in the direction of a transverse axis, a conical flat-oval round filter element in which the flat-oval cross-section tapers in the axial direction at least in the direction of a transverse axis, or a hollow filter element with a different, in particular an angular, cross-section and / or a different axial cross-sectional profile in the direction of an axis element, act.

The filter medium may advantageously be circumferentially closed or open with respect to the element axis. The filter medium may in particular be star-shaped, preferably zigzag-shaped or wavy, folded or bent. The filter medium may also be unfolded or unbent.

Advantageously, the filter system, in particular the liquid filter and / or the hollow filter element, at least one Vorabscheideeinrichtung and / or at least one Nachabscheideeinrichtung or at least parts thereof. At least one pre-separation device can advantageously have at least one pre-filter, in particular for water or the like. At least one pre-separation device can advantageously have a device suitable for the separation of water from fuel or oil, in particular a coalescing medium or a type of centrifuge.

Advantageously, the filter head may comprise or consist of metal, in particular aluminum, and / or plastic. Advantageously, the filter head can be realized by a molding method, in particular a casting method, die casting method or injection molding method.

Advantageously, the filter head may comprise at least one attachment portion for attachment to a wall, an engine block, a chassis or the like.

Advantageously, the filter head can have at least one supply line and / or at least one discharge for liquid. At least one supply line and / or at least one discharge line can be designed on one side in terms of flow for connecting the liquid filter. On the other side of the fluid side, at least one supply line and / or at least one discharge line can have at least one connection for at least one corresponding liquid supply and / or liquid discharge of the liquid system, in particular a fuel system or a motor oil circuit.

Advantageously, the filter head may comprise at least one connecting portion. The liquid filter can be connected to the at least one connecting section. At least one connecting section may have at least one corresponding line section of at least one supply and / or discharge for liquid and / or at least one axial sealing surface for at least one axial sealing section and / or at least one fastening and / or holding element for fastening the liquid filter.

The hollow filter element can advantageously be part of an engine oil filter, in particular an engine oil circuit of an internal combustion engine of a motor vehicle. The engine oil filter can be used for cleaning engine oil, which is supplied to the internal combustion engine. Alternatively, the hollow filter element may be part of a fuel filter, in particular of a fuel circuit of an internal combustion engine of a motor vehicle. The fuel filter can be used for cleaning of fuel, in particular gasoline or diesel fuel, which is supplied to the internal combustion engine for combustion.

However, the invention is not limited to an engine oil filter or a fuel filter of an internal combustion engine of a motor vehicle. Rather, it can also be used in other types of fluid systems, in particular hydraulic systems, cooling systems, urea-water systems or the like, of motor vehicles, machines, in particular agricultural machines or construction machines, or utility machines and / or vehicles. The liquid filter can also be used outside the automotive industry, especially in industrial engines.

In an advantageous embodiment, the adapter element may be connected in several pieces or in one piece with the filter bellows and / or possibly an end body of the hollow filter element.

Advantageously, the adapter element can advantageously be connected in several pieces to the filter bellows and / or optionally to the end body of the hollow filter element. In this way, the adapter element can be manufactured separately. It can be connected as needed with other components of the hollow filter element. Thus, a standardized adapter element can be used. The adapter element can be used to connect different hollow filter elements to filter heads of the same or similar type. The adapter element can be used for connection to housing pots of the same or similar design.

Advantageously, the adapter element by means of at least one cohesive and / or positive and / or non-positive connection, in particular a fit, a plug connection, an adhesive bond, a welded joint, a solder joint, a clamping connection, a locking connection, a rotary / plug connection, in particular a screw connection and / or a bayonet-type connection, or the like, or a combination of several types of connection, be directly or indirectly connected to the filter bellows and / or optionally the end body. The materials and / or structures of the adapter element on the one hand and the filter bellows and / or optionally of the end body on the other hand can also penetrate each other for connection. Advantageously, one of the components at least partially embedded in the material of the other component, in particular injected and / or cast, or be sheathed by this.

Alternatively, the adapter element may be integrally connected to at least one end body of the hollow filter element. In this way, the adapter element can be manufactured together with the end body and connected to the filter bellows.

Alternatively, the adapter element can be realized as part of the at least one end body or vice versa. The adapter element can in particular assume the function of an end body.

In a further advantageous embodiment, at least one radial sealing section and at least one axial sealing section can be realized in several pieces and / or at least one radial sealing section and at least one axial sealing section can be realized in one piece.

Advantageously, at least one radial sealing section and at least one axial sealing section can be realized in several pieces. The sealing portions can be manufactured and assembled separately from each other in this way. The at least one radial sealing portion and the at least one Axialdichtungsabschnitt can be arranged spaced from each other. The at least one radial sealing portion and the At least one Axialdichtungsabschnitt may advantageously be made of the same material or of different materials. Multi-piece realized sealing sections can be optimized independently of each other in each case for their function.

Alternatively or additionally, advantageously at least one radial sealing section and at least one axial sealing section can be realized in one piece. In this way, a manufacturing and assembly costs can be reduced. Furthermore, such a component expenditure can be reduced.

Advantageously, at least one radial sealing section and at least one axial sealing section can be arranged offset from one another. Advantageously, viewed in the direction of the element axis, the axial sealing section can be located radially within the projection of the radial sealing section. Thus, the at least one radial sealing section can seal in a region located further outward against the peripheral wall of the housing pot. The at least one Axialdichtungsabschnitt can seal in a radially further inner region regardless of the at least one radial sealing portion against the filter head.

Advantageously, at least one radial seal portion and at least one axial seal portion may have different or equal seal types. Advantageously, the sealing sections can be configured as profile seals, ring seals, in particular O-ring seals, flat seals and / or lip seals or the like, or as a combination of such seals.

At least one radial sealing section and / or at least one axial sealing section can advantageously comprise or consist of elastic material, in particular plastic, and / or inelastic material, in particular plastic. Elastic materials can improve tolerance compensation. Furthermore, they can improve vibration damping and / or sound attenuation. Inelastic materials can improve dimensional stability of the sealing portions. When combining materials, the respective advantages of inelastic and elastic materials can be combined.

In a further advantageous embodiment, the hollow filter element may have at least one passage for at least one particular rod-shaped tension element for supporting the hollow filter element and / or the housing pot on the filter head of the filter system, wherein the at least one passage extending parallel or coaxial to the element axis at least partially through the element interior and may be open to at least one end face of the hollow filter element.

As a result of the at least one bushing, the at least one, in particular, rod-shaped tension element can be guided in the direction of the element axis through the hollow filter element.

The at least one tension element can be fastened with one end indirectly or directly on the filter head. With the opposite free end, the at least one tension element can act on the hollow filter element and / or the housing pot in a force-transmitting manner.

The at least one tension element can be guided from the outside through the at least one bushing through the housing pot and / or the hollow filter element and fastened to the filter head. The at least one tension element can thus exert a tensile force on the hollow filter element and / or the housing pot. The tensile force can cause a compressive force between the hollow filter element and / or the housing pot on the one hand and the filter head on the other. With the pressure force, a sealing force can be increased to at least one Axialdichtungsabschnitt.

The at least one tension element can advantageously act on the closed end side of the housing pot. Thus, the tensile force of the tension element can be transmitted directly between the filter head and the housing pot. The hollow filter element can thus be relieved of power at least in relation to the holding forces of the liquid filter on the filter head.

Advantageously, the at least one tension element can be passed through a corresponding central opening through the closed end side of the housing pot. So it can be operated from outside the housing pot.

Advantageously, the at least one tension element can be connected by means of at least one rotary and / or plug connection, in particular a screw connection or bayonet-type connection, directly or indirectly to the filter head and / or the housing pot. Alternatively, the at least one tension element can be firmly connected to the housing pot. Thus, the at least one tension element can be connected to the filter head by a corresponding rotary and / or plug-in movement of the housing pot relative to the filter head.

Advantageously, the at least one tension element at its filter head facing the free end of an external thread or an outer part of a bayonet-type compound, with it is in a corresponding internal thread or an inner part of the bayonet-type connection on the side of the filter head in connection, in particular screwed, can be. Alternatively, the at least one tension element can have the internal thread or inner part. Instead, the corresponding external thread or outer part can be arranged on the filter head side.

Advantageously, the at least one tension element on the free end opposite the connection to the filter head can have an attack possibility for a tool or a manual operation, in particular a suitable, in particular standardized or standardized, screw head. Thus, the at least one tension element can be operated easier and better.

Alternatively, the at least one tension member may have at its free end an external thread on which a threaded nut or a wing nut or the like can be screwed, or a bayonet-type connection part on which a corresponding bayonet-type connection element can be placed.

Advantageously, at least one tension element can be configured as a tie rod, fastening bolts, stud bolts, in particular with threads or the like.

Advantageously, the at least one passage can extend coaxially to the element axis. If the element axis coincides with the housing axis and the connection axis, then the tension element and / or the hollow filter element and / or the housing pot can be brought into contact with the filter head by means of a corresponding rotational and / or insertion movement about the element axis / connection axis / housing axis.

Advantageously, the at least one bushing can be realized at least partially in / on at least one adapter element and / or be formed by it. Advantageously, the at least one passage can extend at least in the axial projection within an at least one adapter element realized as an annular body.

In one embodiment, passage openings are provided on the adapter element and / or on the end body, which lead between the adapter element and the connection-side end body from radially inward to radially outward. As a result, liquid can pass from the region inside the axial sealing section into an inlet ring space, which is arranged in particular in an annular manner around the outside of the hollow filter element. These passage openings preferably exit on the side of the radial sealing section facing away from the axial sealing section to the outside.

To realize the passage openings, a plurality of spacer webs may, for example, be distributed circumferentially on an end side of the adapter element facing the connection-side end body.

In a further advantageous embodiment, the hollow filter element on the front side with the at least one adapter element at least one receptacle for at least one tensile force transmission element, which can be arranged on the filter head and can be connected to the one end of a tension member there with respect to the element axis axially force transmitting can be. About the tensile force transmission element, the tension element can be connected directly or indirectly with the filter head. In the at least one receptacle, the at least one tensile force-transmitting element can be arranged to save space.

At least one traction transfer element can advantageously be connected in several pieces or in one piece with the filter head.

In a multi-piece connection, the at least one tensile force transmitting element may optionally be connected to the filter head. Thus, tensile force transmission elements of different types can be used and combined with corresponding different tension elements or hollow filter elements. If necessary, in particular when using a replaceable filter, the at least one tensile force transmission element can be removed. The liquid filter, in particular the replaceable filter, can then be connected directly to the filter head. The at least one tensile force-transmitting element can act as a kind of adapter with which existing filter elements on the filter head, in particular connecting pieces, can be adapted to the respective filter-side connecting elements used.

Advantageously, at least one tensile force transmitting element can be releasably or non-destructively releasably connected to the filter head or be. At least one tensile force-transmitting element can be connected to the filter head by means of a material-locking and / or positive and / or non-positive connection.

At least one tensile force-transmitting element can advantageously by means of a rotary and / or plug connection, in particular a screw connection, a latching connection, bayonet-like Connection or a combined connection to be connected to the filter head.

Additionally or alternatively, at least one tensile force transmission element can realize at least a part of a fluid line, in particular a clean fluid line or a raw fluid line, of the filter head.

Advantageously, at least one tensile force transmission element can be realized as a kind of sleeve. The at least one tensile force transmission element may advantageously have corresponding flow openings for the liquid in its peripheral sides. With the flow-through openings, a liquid-conducting area, which can surround the traction-transmitting element, be connected to the interior of the traction-transmitting element. An interior of the at least one traction transfer element may be connected to a corresponding fluid conduit for the fluid on the filter head side.

Advantageously, at least one tensile force-transmitting element on a side facing away from the filter head end face have at least one connection opening for at least one tension element. In the connection opening, the corresponding end of the at least one tension element can be introduced by means of a rotary and / or plug movement. The at least one tension element can have an internal thread or an inner part of a bayonet-type connection in the region of the connection opening.

Alternatively or additionally, at least one tensile force-transmitting element can be introduced with its end remote from the filter head in a corresponding connection opening at the end of the tension element. The connection can be realized there by means of one of the already enumerated above rotary and / or plug connections.

Advantageously, at least one tensile force-transmitting element on its side facing the filter head have an internal thread or an inner part of a bayonet-type compound. The internal thread or the inner part can be brought into contact with a corresponding external thread or a corresponding outer part of the bayonet-type connection on the side of the filter head.

Advantageously, the filter head may have a connecting piece. The connecting piece may have the external thread or the corresponding outer part of the bayonet-type connection or an internal thread or an inner part of the bayonet-type connection. Additionally or alternatively, the connection piece can have a liquid line section which is connected to or forms a fluid line of the filter head.

Instead of several pieces, at least one tensile force transmission element can be integrally connected to the filter head. In this way, the at least one tensile force transmitting element can be manufactured with fewer manufacturing steps together with the filter head. Advantageously, at least one tensile force transmission element can be realized on or in connection with a connection piece of the filter head.

By means of the at least one adapter element in combination with the optional tensile force transmission element, a filter head, which is otherwise provided for conventional replaceable filter, the liquid filter according to the invention with an exchangeable hollow filter element can be used.

The technical object is further achieved by the liquid filter, characterized in that on one end face of the hollow filter element, an adapter element is arranged, which has at least one with respect to the element axis radially outwardly sealing annular radial sealing portion and which axially at least one of the at least one filter medium with respect to the element axis A sealable annular Axialdichtungsabschnitt for sealing against a filter head and / or at least one Axialdichtungsaufnahme for at least one such Axialdichtungsabschnitt, wherein at least one radial sealing portion bears radially sealingly on a relative to the element axis radially inwardly directed radial sealing surface of the housing pot in the region of an installation opening for the hollow filter element.

The technical object is also achieved by the filter system, characterized in that on one end side of the hollow filter element, an adapter element is arranged, which has at least one with respect to the element axis radially outwardly sealing annular radial sealing portion and which at least one of the at least one filter medium with respect to the element axis axially Has sealing sealing ring-shaped axial sealing portion, wherein at least one radial sealing portion against a radially inwardly directed radially in relation to the element axis of the housing pot in the region of an installation opening for the hollow filter element radially sealingly abuts and at least one Axialdichtungsabschnitt against an axially directed Axialdichtfläche the filter head axially sealingly.

Incidentally, the technical problem is solved by the adapter element in that the adapter element has at least one annular radial sealing section radially inwardly of the element axis and / or at least one radial sealing receptacle for at least one radial sealing section and at least one of the at least one filter medium relative to the element axis axially sealable annular Axialdichtungsabschnitt for sealing against a filter head and / or at least one Axialdichtungsaufnahme for at least one such Axialdichtungsabschnitt, wherein optionally an outer diameter of the at least one Radialdichtungsabschnitts at least operatively compressed sealing condition and / or optionally an outer diameter of the adapter element at least in the adjacent region of at least a radial seal receptacle is smaller than an inner diameter of the housing pot of the Liquid filter, at least in the region of an installation opening for the hollow filter element.

Incidentally, the features and advantages shown in connection with the hollow filter element according to the invention, the liquid filter according to the invention, the filter system according to the invention and the adapter element according to the invention and their respective advantageous embodiments apply mutatis mutandis and vice versa. The individual features and advantages can, of course, be combined with one another, whereby further advantageous effects can be achieved that go beyond the sum of the individual effects.

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. It show schematically

1 an isometric view of a filter system for filtering liquid of an internal combustion engine, with a filter head, a liquid filter with a housing pot in which a filter element is interchangeably arranged;

2 a first longitudinal section of the filter system of the 1 ;

3 a detailed view of the longitudinal section of the 2 in the region of a connection of the liquid filter with the filter head;

4 a second longitudinal section of the filter system of the 1 in another cutting plane;

5 a longitudinal section of the filter element of the liquid filter from the 1 to 4 ;

6 an oblique view of the filter element;

7 a further oblique view of the filter element.

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

Embodiment (s) of the invention

In the 1 to 7 is a filter system 10 for filtering liquid and its components in different perspectives and sections shown. The filter system 10 can be arranged to filter the liquid in a liquid system not further shown. With the filter system 10 For example, fuels of an internal combustion engine, for example fuel, oil, water or urea water solution, can be cleaned. The filter system 10 can be used in a motor vehicle.

The filter system 10 includes a filter head 12 , in the 1 to 4 above. In working condition, as in the 1 to 4 is shown is a liquid filter 14 , below, separable with the filter head 12 connected.

The filter head 12 includes a mounting portion 16 with which it can be connected to the frame or another component, such as the internal combustion engine.

The filter head 12 has an entry line 18 for the supplied liquid to be purified. On the outside of the filter head 12 has the entrance pipe 18 via a corresponding line connection for connection to a corresponding conveying liquid line of the fluid system.

Furthermore, the filter head 12 an outlet line 20 through, through the purified liquid from the filter system 10 can get into a corresponding discharge liquid line of the fluid system. The outlet line 20 On opposite sides has two line connections, one of which optionally with the corresponding discharge liquid line can be connected.

The entrance line 18 and the discharge line 20 each lead into a connecting section 22 of the filter head 12 which is the connection with the fluid filter 14 serves.

The outlet line 20 leads with a fluidic front section coaxial with an axis 24 through the connecting section 22 ,

The entrance line 18 leads with a corresponding aerodynamically rear section eccentric to the axis 24 radially outside the front portion of the discharge line 20 from the connection section 22 out.

The axis 24 falls in the embodiment together with a housing axis of a housing pot 42 , an installation / removal axis of a filter element 44 in the housing pot 42 and an element axis of the filter element 44 , For the sake of clarity, the element axis, the housing axis and the installation / removal axis are denoted by the same reference numerals below 24 provided and become short as axis 24 designated. It is understood that with the filter element removed 44 , Depending on the context, the housing axis, the element axis and / or the installation / removal axis is meant. Whenever hereinafter referred to as "radial,""coaxial,""axial,""circumferential," or the like, this refers to the axle unless otherwise specified 24 ,

The front section of the inlet pipe 18 and the rear portion of the discharge line 20 point to the connection side of the connection section 22 which is the liquid filter 14 facing, in each case an opening.

On the connection side has the connection section 22 also via a head-side Axialdichtfläche 26 , The axial sealing surface 26 is ring-shaped. It is coaxial with the axis 24 arranged. It is located radially on the outside. The plane of the axial sealing surface 26 runs perpendicular to the axis 24 , The axial sealing surface 26 is about the axis 24 directed axially. The axial sealing surface 26 surrounds the respective openings of the rear portion of the inlet duct 18 and the front portion of the discharge line 20 radially outer circumferentially contiguous.

The front section of the outlet pipe 20 is on the connection side of a coaxial connector 28 educated. The connection piece 28 shows from the connection side of the filter head 12 to the liquid filter 14 , The connection piece 28 has the shape of a round hollow cylinder. The connection piece 28 is integral with the connecting portion 22 connected. In the region of its free end, the radially outer peripheral side of the connecting piece 28 an external thread 30 on.

Further, on the filter head 12 one in the 1 shown here not further interested liquid pump 32 assembled.

On the connecting piece 28 is a sleeve-type tensile force transmission element 34 screwed. The interior of the tensile force transmission element 34 is fluidly with the interior of the connecting piece 28 and thus with the outlet line 20 connected.

The tensile force transmission element 34 has at its the connecting piece 28 facing end on its radially inner peripheral side a to the external thread 30 matching first internal thread 36 on to the realization of a screw connection with the connecting piece 28 ,

The peripheral wall of the tensile force transmitting element 34 is simply graded. Its diameter in a cross section widened section in which it is on the connecting piece 28 is screwed, is larger than its diameter in a cross-section tapered portion, which is axially outside of the connecting piece 28 located.

On the radially inner peripheral side of the cross-section tapered portion, the tensile force transmitting member 34 a second internal thread 38 on. The second internal thread 38 has a smaller diameter than the first internal thread 36 ,

In the cross-section tapered section axially between the step and the second internal thread 38 lead two through-holes 40 through the peripheral wall of the tensile force transmitting element 34 , The passage holes 40 are on the axis 24 radially opposite sides.

The housing pot 42 of the liquid filter 14 points to his the filter head 12 facing side an installation opening for the filter element 44 on. The housing pot 42 has a round cross section. Its edge, which surrounds the mounting opening circumferentially, is bent radially outward.

Axial next to the edge has the radially inner peripheral side of the housing pot 42 via a pot-side radial sealing surface 46 , The radial sealing surface 46 is directed radially inward. It surrounds the mounting opening with respect to the axis 24 coaxial and circumferentially connected.

At a closed end of the housing pot 42 , which is axially opposite the installation opening, in the 1 to 4 below, outside is a connection unit 48 arranged. The connection unit 48 has a guide sleeve 50 , The guide sleeve 50 Coaxially extends through the closed end of the housing pot 42 ,

The guide sleeve 50 is to the inside of the housing pot 42 and open to the outside. Inside the housing pot 42 has the guide sleeve 50 on its radially outer peripheral side a helically extending threaded ridge 52 on.

In the area of the closed front side is the housing pot 42 designed as a collecting space for separating liquid, which can be separated from the liquid to be purified. The separating liquid can be, for example, water, which can be separated from oil or fuel to be purified by means of a deposition device, for example a coalescing medium, which is of no further interest here.

The connection unit 48 furthermore carries a fluid level sensor of no further interest here 54 For example, a water level sensor, and a drain plug 56 for draining the separating liquid from the collecting space. The liquid level sensor 42 and the drain plug 56 lead through the connection unit 48 and the closed end of the housing pot 42 in the collection room.

The filter element 44 is in detail in the 5 to 7 shown. The filter element 44 is designed as a so-called round filter element. It has a filter medium 58 , which circumferentially connected to an approximately hollow cylindrical to the axis 24 coaxial filter bellows 60 is shaped. The filter medium 58 is suitable for filtering the liquid. It consists for example of filter paper. The filter medium 58 surrounds a coaxial element interior 62 the filter bellows 60 closed circumferentially.

At its end faces, the filter element 44 on the filter head 12 facing side a terminal-side end plate 64 on. On the opposite front side has the filter element 44 via an inner end disc 66 , The inner end disk 66 located with built-in filter element 44 inside the housing pot 42 , The end discs 64 and 66 are each with the filter medium 58 tightly connected.

Between the end discs 64 and 66 extends in the element interior 62 coaxial with a circular cylindrical support grid 68 , At the radially outer peripheral side of the support grid 68 can the filter bellows 60 supported with its radially inner peripheral side.

The support grid 68 is each at the corresponding inside of the end plates 64 and 66 attached. The support grid 68 itself is open on both ends.

The inner end disk 66 has a coaxial counter guide sleeve 70 on. The counter guide sleeve 70 is integral with the inner end disc 66 connected. The counter guide sleeve 70 extends on the outside of the inner end plate 66 axially from the element interior 62 path. The counter guide sleeve 70 is on her element interior 62 facing away from the front side open. Its inner diameter corresponds approximately to an outer diameter of the guide sleeve 50 of the housing pot 42 at the radially inner sides of the threaded ridge 52 ,

At its radial inner peripheral side, the counter guide sleeve 70 one to the threaded bar 52 suitable thread groove 72 on.

The inner end disk 66 has a coaxial passage opening 74 for a rod-shaped tension element 76 on. The passage opening 74 is located between the interior of the counter guide sleeve 70 and the element interior 62 , The passage opening 74 connects with non-installed filter element 44 the interior of the counter guide sleeve 70 with the element interior 62 , The diameter of the lead-through opening 74 corresponds approximately to the inner diameter of the guide sleeve 50 of the housing pot 42 , An outer diameter of the tension element 76 corresponds to the inner diameter of the passage opening 74 and the inner diameter of the guide sleeve 50 ,

In the passage opening 74 a coaxial ring seal is arranged. The ring seal seals when the filter element is installed 44 the radially inner peripheral side of the inner end plate 66 against the radially outer circumferential side of the tension element 76 from.

In the guide sleeve 50 of the housing pot 42 a further coaxial annular seal is arranged. This ring seal is located at the level of the closed end of the housing pot 44 , It seals with mounted liquid filter 14 the radially outer peripheral side of the tension member 76 against the guide sleeve 50 from.

When installed, the filter element is 44 with his Gegenführungshülse 70 using the thread ridges 56 and the thread groove 72 on the guide sleeve 50 screwed. The element interior 62 is by means of the inner end disc 66 from the plenum of the housing pot 42 separated.

The connection-side end plate 64 is designed as an annular disc. It has a coaxial insertion opening 78 on. Through the insertion opening 78 is enough for built-in filter element 44 the tensile force transmitting element 34 in the element interior 62 , The insertion opening 78 forms a receptacle for the tensile force transmission element 34 , The insertion opening 78 is surrounded by a coaxial collar. The collar has on its radially inner peripheral side a sealing groove with a radially inner annular seal 80 on.

On the connection-side end plate 64 is coaxial from the outside an annular adapter element 82 attached. An outer diameter of the adapter element 82 is larger than an outer diameter of the filter bellows 60 , An inner diameter of a coaxial opening of the adapter element 82 is larger than the inner diameter of the filter bellows 60 ,

At its radially outer peripheral side, the adapter element 82 a step up. A cross-section tapered portion of the adapter element 82 , in the 5 below, is located on the filter bellows 60 axially facing side. A radially outer cross section of the cross-section tapered portion is smaller than a radially inner cross section of the pot-side radial sealing surface 46 in the area of the installation opening of the housing pot 42 ,

The cross-section tapered portion has a coaxial radial seal groove on its radially outer peripheral side 84 on. In the radial sealing groove 84 is a radially acting radial seal 86 arranged. The radial seal 86 has the shape of an O-ring seal.

With built-in filter element 44 is the cross-section tapered portion of the adapter element 82 inside the installation opening of the housing pot 42 , The radial seal 86 acts in the radial direction sealingly with the pot-side radial sealing surface 46 together. A radially outer cross section of the radial seal 86 is at least in compressed state with installed filter element 44 smaller than the radially inner cross section of the pot-side radial sealing surface 46 ,

An outer diameter of the cross-sectional widened portion of the adapter element 82 is about the same size as the outer diameter of the housing pot 42 in the area of its edge. In the installed state of the cross-sectional widened portion of the adapter element is located 82 axially on the edge of the housing pot 42 on. It is located axially between the edge of the housing pot 42 and a corresponding abutment surface of the connecting portion 22 of the filter head 12 , The cross-sectional widened portion of the adapter element 82 thus forms a part of the housing of the liquid filter 14 ,

In the axial projection radially within the Radialdichtungsnut 84 is located at the filter bellows 60 remote from the outer end face of the adapter element 82 an axial sealing groove 88 , The Axialdichtungsnut 88 is in the axial direction on its the filter bellows 60 axially facing away from the side. In the Axialdichtungsnut 88 is a coaxial annular axial seal 90 arranged. The axial seal 90 is designed as a flat gasket. The axial seal 90 works with assembled filter system 10 axially sealing with the head-side Axialdichtfläche 26 together.

For mounting the filter system 10 becomes the filter element 44 with the inner end disc 66 passing through the mounting hole in the housing pot 42 plugged. By means of a screwing the counter guide sleeve 70 on the guide sleeve 50 screwed. The filter element 44 is screwed in until the cross-sectional widened portion of the adapter element 82 on the edge of the housing pot 42 is applied. In this mounting condition seals the radial seal 86 against the pot-side radial sealing surface 46 radially off.

The pre-assembled liquid filter 14 comes with the adapter element 82 advancing coaxially on the connecting portion 22 of the filter head 12 plugged. In this case, the tensile force transmission element 34 at the filter head 12 in the insertion opening 78 the connection-side end plate 64 introduced. The axial seal 90 seals axially against the head-side Axialdichtfläche 26 from.

Subsequently, the tension element 76 through the guide sleeve 50 , the passage opening 74 and the element interior 62 to the tensile force transmitting element 34 pushed. The passage opening 74 and the element interior 62 serve as a passage of the filter element 44 for the tension element 76 , The implementation thus extends coaxially to the axis 24 through the element interior 62 , It is the pot-side end of the filter element 44 on the side of the inner end disk 66 open.

At its the traction transfer element 34 facing the end, the tension element 76 an external thread 92 on. The external thread 92 fits the second internal thread 38 of the tensile force transmitting element 34 ,

The tension element 76 gets into the second internal thread 38 of the tensile force transmitting element 34 screwed. In this case, by means of a tensile force of the tension element 76 an axial compressive force between the housing pot 42 and the filter head 12 exercised. The housing pot 42 is against the cross-sectional widened edge of the adapter element 42 suppressed. The axial seal 90 becomes axially against the head-side axial sealing surface with the axial compressive force 26 pressed. The sealing force is via the tension element 76 , the housing pot 42 and the adapter element 82 transfer. The filter element 44 remains free of the mounting and holding forces of the tension element 76 out.

The tension element 76 has at its outer free end a screw head on which a corresponding tool for screwing and unscrewing the tension element 76 can be recognized.

The filter element 44 is a total interchangeable in the housing pot 42 arranged. To replace the filter element 44 becomes the liquid filter 14 in reverse order from the filter head 12 separated. The filter element 44 is then removed from the housing pot 42 unscrewed and can be exchanged.

When operating the filter system 10 flows to be purified liquid from the leading liquid line through the inlet line 18 in the filter head 12 , From there, the liquid enters an inlet chamber 96 between the connection-side end plate 64 and the connection section 22 ,

The liquid is taken from the inlet chamber 96 through corresponding passages 98 between the adapter element 82 and the connection-side end plate 64 led radially outward and enters an inlet annulus 100 ,

For the realization of the passage openings 98 are at the terminal side end plate 64 facing end side of the adapter element 82 a variety of spacer bars 102 arranged distributed circumferentially. The distance bridges 102 are for example in the 6 and 7 shown.

The inlet ring space 100 is located between the radially outer peripheral side of the filter bellows 60 and the radially inner peripheral side of the housing pot 42 , The inlet ring space 100 located on the raw side upstream side of the filter element 44 ,

The liquid flows through the filter medium 58 from radially outside to radially inside and is filtered. The purified liquid passes through the peripheral wall of the support grid 68 in the element interior 62 , The liquid flows through the passage holes 40 in the interior of the tensile force transmission element 34 , From there it enters the outlet pipe 20 and is through the appropriate connected port from the filter system 10 led into the discharging liquid line.

The filter head 12 can take place with the liquid filter 14 with the replaceable filter element 44 also be equipped with a so-called replaceable filter or spin-on filter. In the replaceable filter or spin-on filter, a corresponding filter element is fixedly arranged in a filter housing and is exchanged with this.

To use the replaceable filter is the tensile force transmitting element 34 from the connecting piece 28 of the filter head 12 screwed. Subsequently, the replaceable filter is directly on the external thread 30 of the connecting piece 28 screwed.

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

• US 20090127198 A1 [0005]

Claims (8)

Hollow filter element ( 44 ) a liquid filter ( 14 ) of a filter system ( 10 ) for filtering liquid, wherein the liquid filter ( 14 ) for exchangeable mounting on a filter head ( 12 ) of the filter system ( 10 ) is provided, the hollow filter element ( 44 ) at least one filter bellows ( 60 ) comprises at least one filter medium ( 58 ), which has an element interior ( 62 ) with respect to an element axis ( 24 ) circumferentially at least partially surrounds, and the hollow filter element ( 44 ) for exchangeable installation in a housing pot ( 42 ) of the liquid filter ( 14 ) is configured, characterized in that on an end face of the hollow filter element ( 44 ) an adapter element ( 82 ) is arranged, which at least one with respect to the element axis ( 24 ) radially outwardly sealable annular radial sealing portion ( 86 ) and / or at least one radial seal receptacle ( 84 ) for at least one such radial sealing section ( 86 ) and which at least one of the at least one filter medium ( 58 ) with respect to the element axis ( 24 ) axially sealable annular Axialdichtungsabschnitt ( 90 ) for sealing against a filter head ( 12 ) and / or at least one Axialdichtungsaufnahme ( 88 ) for at least one such Axialdichtungsabschnitt ( 90 ), optionally wherein an outer diameter of the at least one radial sealing portion ( 86 ) at least in operationally compressed sealing state and / or optionally an outer diameter of the adapter element ( 82 ) at least in the adjacent region of the at least one radial seal receptacle ( 84 ) is smaller than an inner diameter of the housing pot ( 42 ) of the liquid filter ( 14 ) at least in the region of an installation opening for the hollow filter element ( 44 ). Hollow filter element according to claim 1, characterized in that the adapter element ( 82 ) in one piece or in one piece with the filter bellows ( 60 ) and / or optionally an end body ( 64 ) of the hollow filter element ( 44 ) connected is. Hollow filter element according to claim 1 or 2, characterized in that at least one radial sealing section ( 86 ) and at least one Axialdichtungsabschnitt ( 90 ) are realized in several pieces and / or at least one radial sealing portion and at least one Axialdichtungsabschnitt are realized in one piece. Hollow filter element according to one of the preceding claims, characterized in that the hollow filter element ( 44 ) at least one implementation ( 70 . 74 . 62 ) for at least one in particular rod-shaped tension element ( 76 ) for holding the hollow filter element ( 44 ) and / or the housing pot ( 42 ) on the filter head ( 12 ) of the filter system ( 10 ), wherein the at least one implementation ( 70 . 74 . 62 ) parallel or coaxial with the element axis ( 24 ) at least partially through the element interior ( 62 ) and to at least one end face of the hollow filter element ( 44 ) is open. Hollow filter element according to one of the preceding claims, characterized in that the hollow filter element ( 44 ) on the front side with the at least one adapter element ( 82 ) at least one recording ( 78 ) for at least one traction transfer element ( 34 ), which on the filter head ( 12 ) is or can be arranged and with the local end of a tension element ( 76 ) with respect to the element axis ( 24 ) can be connected axially transmitting force. Liquid filter ( 14 ) of a filter system ( 10 ) for filtering liquid which is exchangeable on a filter head ( 12 ) is or can be attached and is fluidly connected to this or can be, wherein the liquid filter ( 14 ) at least one housing pot ( 42 ) and at least one hollow filter element ( 44 ), in particular according to one of the preceding claims, comprising at least one Hollow filter element ( 44 ) exchangeable in the at least one housing pot ( 42 ) is or can be arranged and the at least one hollow filter element ( 44 ) at least one filter medium ( 58 ), which has an element interior ( 62 ) of the hollow filter element ( 44 ) with respect to an element axis ( 24 ) circumferentially at least partially, characterized in that on an end face of the hollow filter element ( 44 ) an adapter element ( 82 ) is arranged, which at least one with respect to the element axis ( 24 ) radially outwardly sealing annular radial sealing portion ( 86 ) and which at least one of the at least one filter medium ( 58 ) with respect to the element axis ( 24 ) axially sealable annular Axialdichtungsabschnitt ( 90 ) for sealing against a filter head ( 12 ) and / or at least one Axialdichtungsaufnahme ( 88 ) for at least one such Axialdichtungsabschnitt ( 90 ), wherein at least one radial sealing portion ( 86 ) at one with respect to the element axis ( 24 ) radially inwardly directed radial sealing surface of the housing pot ( 42 ) in the region of an installation opening for the hollow filter element ( 44 ) bears radially sealing. Filter system ( 10 ) for filtering liquid, the at least one filter head ( 12 ) with liquid lines and at least one liquid filter ( 14 ), in particular according to one of the preceding claims, wherein at least one liquid filter ( 14 ) exchangeable on a filter head ( 12 ) and fluidly connected thereto, the at least one fluid filter ( 14 ) at least one housing pot ( 42 ) and at least one hollow filter element ( 44 ), the at least one hollow filter element ( 44 ) exchangeable in the at least one housing pot ( 42 ) is arranged, the at least one hollow filter element ( 44 ) at least one filter medium ( 58 ), which has an element interior ( 62 ) of the hollow filter element ( 44 ) with respect to an element axis ( 24 ) circumferentially at least partially, characterized in that on an end face of the hollow filter element ( 44 ) an adapter element ( 82 ) is arranged, which at least one with respect to the element axis ( 24 ) radially outwardly sealing annular radial sealing portion ( 86 ) and which at least one of the at least one filter medium ( 58 ) with respect to the element axis ( 24 axially axially sealing annular axial sealing portion (FIG. 90 ), wherein at least one radial sealing portion ( 86 ) against one with respect to the element axis ( 24 ) radially inwardly directed radial sealing surface of the housing pot ( 42 ) in the region of an installation opening for the hollow filter element ( 44 ) radially sealingly abuts and at least one Axialdichtungsabschnitt ( 90 ) against an axially directed axial sealing surface ( 26 ) of the filter head ( 12 ) bears axially sealing. Adapter element ( 82 ) of a hollow filter element ( 44 ) a liquid filter ( 14 ) of a filter system ( 10 ) for filtering liquid, in particular according to one of the preceding claims, wherein the liquid filter ( 14 ) for exchangeable mounting on a filter head ( 12 ) of the filter system ( 10 ) is provided and the hollow filter element ( 44 ) at least one filter bellows ( 60 ) comprises at least one filter medium ( 58 ), which has an element interior ( 62 ) of the hollow filter element ( 44 ) with respect to an element axis ( 24 ) circumferentially at least partially, characterized in that the adapter element ( 82 ) at least one with respect to the element axis ( 24 ) radially outwardly sealable annular radial sealing portion ( 86 ) and / or at least one radial seal receptacle ( 84 ) for at least one such radial sealing section ( 86 ) and which at least one of the at least one filter medium ( 58 ) with respect to the element axis ( 24 ) axially sealable annular Axialdichtungsabschnitt ( 90 ) for sealing against a filter head ( 12 ) and / or at least one Axialdichtungsaufnahme ( 88 ) for at least one such Axialdichtungsabschnitt ( 90 ), optionally wherein an outer diameter of the at least one radial sealing portion ( 86 ) at least in operationally compressed sealing state and / or optionally an outer diameter of the adapter element ( 82 ) at least in the adjacent region of the at least one radial seal receptacle ( 84 ) is smaller than an inner diameter of the housing pot ( 42 ) of the liquid filter ( 14 ) at least in the region of an installation opening for the hollow filter element ( 44 ).

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