DE102014006850B4 - Filter housing, hollow filter element and filter - Google Patents

Abstract

Filter housing (12) of a filter for fluid, in particular air, water, fuel, oil or urea solution, in particular an air filter (10), in particular an internal combustion engine, in particular a motor vehicle, in particular a commercial vehicle, which has at least one inlet (26) for the fluid to be cleaned and has at least one outlet (22) for cleaned fluid and in which a hollow filter element (18) with a filter medium (64) for filtering the fluid, which surrounds an element interior (72) with respect to a filter axis (32), can be interchangeably arranged in this way that it separates the at least one inlet (26) from the at least one outlet (22), the filter housing (12) having at least two housing parts (14, 20) which are used to release at least one installation opening (16) of the filter housing (12) for the hollow filter element (18) can be at least partially separated from each other, characterized in that at least one of the housing parts (14) has at least one Connecting lug (46) and at least one other of the housing parts (20) has at least one lug receptacle (52) matching the at least one connecting lug (46) for inserting the at least one connecting lug (46) for connecting the housing parts (14, 20), and that the filter housing (12) has at least one guide track (56) for guiding and/or supporting at least one leveling element (58) of the hollow filter element (18), the at least one guide track (56) extending into a region outside of an interior space (28) of the corresponding Housing part extends.

Description

technical field

The invention relates to a filter housing of a filter for fluid, in particular air, water, fuel, oil or urea solution, in particular an air filter, in particular an internal combustion engine, in particular a motor vehicle, in particular a commercial vehicle, which has at least one inlet for fluid to be cleaned and at least one outlet for purified fluid and in which a hollow filter element with a filter medium for filtering the fluid, which surrounds an element interior space with respect to a filter axis, can be arranged interchangeably in such a way that it separates the at least one inlet from the at least one outlet, the filter housing having at least two housing parts has, which can be at least partially separated from each other to release at least one installation opening of the filter housing for the hollow filter element.

Furthermore, the invention relates to a hollow filter element, in particular a conical-oval round filter element, a filter for fluid, in particular air, water, fuel, oil or urea water solution, in particular an air filter, in particular an internal combustion engine, in particular a motor vehicle, in particular a commercial vehicle, which in a Filter housing, in particular according to one of the preceding claims, can be arranged in such a way that it separates at least one inlet of the filter housing for fluid to be cleaned from at least one outlet for cleaned fluid, with a filter medium for filtering the fluid, which has an element interior space with respect to an element axis circumferentially surrounds.

The invention also relates to a filter for fluid, in particular air, water, fuel, oil or urea solution, in particular an air filter, in particular an internal combustion engine, in particular a motor vehicle, in particular a commercial vehicle, with a filter housing which is composed of at least two housing parts which are used for Releasing at least one installation opening of the filter housing can be at least partially separated from each other, and in which a hollow filter element is arranged interchangeably.

State of the art

An air filter is known from the market, which has a housing with a raw air inlet and a clean air outlet. A round filter element is arranged in the housing between the raw air inlet and the clean air outlet. The round filter element includes a filter medium for cleaning raw air. The housing has a housing pot with an installation opening for the round filter element. The installation opening can be closed with a housing cover. In particular, to replace the round filter element, the housing pot can be separated from the housing cover.

Out of U.S. 7,662,203 B2 an air filter with a conical main filter element and an optional safety element, which are arranged in an openable housing, is known. The main filter element and the housing cover have a projection-receiving device, so that the main filter element is arranged in the housing so that it cannot rotate.

In DE 10 2012 001 575 A1 describes a filter device with a filter medium which is fastened in a peripheral filter frame and which can be fastened in a receiving shaft by means of a sliding movement by means of a fastening unit.

The invention is based on the object of designing a filter housing, a hollow filter element and a filter of the type mentioned at the outset, in which assembly of the filter can be simplified and/or the mechanical stability of the filter, in particular, can be improved. In particular, it should be possible to simplify the connection of the housing parts. Additionally or alternatively, positioning and/or holding of the filter element in the filter housing should be able to be improved, in particular simplified.

Disclosure of Invention

This object is achieved according to the invention by a filter housing according to claim 1, a hollow filter element according to claim 6 and a filter according to claim 8. At least one of the housing parts has at least one connecting lug and at least one other of the housing parts has at least one lug receptacle matching the at least one connecting lug for inserting the at least one connecting lug to connect the housing parts.

The at least one connecting lug can be inserted into the at least one lug receptacle in order to connect the housing parts, in particular a housing cover to a housing pot.

According to the invention, at least one connecting strap and at least one strap receptacle are provided, which act as an adjustment aid, connecting means and/or mechanical stabilization. By interacting with the at least one connecting strap with the at least one tab receptacle, the housing parts can be pre-adjusted during assembly. In this way, assembly can be facilitated. The at least one connecting lug and the at least one lug receptacle can act together as a guide during assembly of the housing parts. Furthermore, tolerances, in particular component-related and/or assembly-related and/or operation-related tolerances, can be compensated for with the at least one connecting strap and the at least one strap receptacle. This is particularly advantageous when using relatively large, in particular flat, conical-oval housing parts. When the filter housing is mounted, the at least one connecting strap can improve mechanical stabilization of at least one corresponding peripheral wall section of at least one of the housing parts. The at least one connecting strap can support the at least one peripheral wall section at least radially to the element axis and/or to a housing axis. Through the interaction of the at least one connecting lug with the at least one lug receptacle, tightness at transitions between the connected housing parts can be improved. Guidance of the hollow filter element in at least one of the housing parts when assembling the housing parts can become more precise.

At least one of the housing parts, preferably all of the housing parts to be connected to one another by means of the at least one connecting strap, can advantageously be made of plastic. At least one of the housing parts can advantageously be realized by an injection molding process or a blow molding process.

At least one of the housing parts can have an extension axially to the housing axis of 30 cm to 40 cm and more.

The at least one tab receptacle can advantageously be a depression that is closed circumferentially with respect to its axis. In this way, the at least one connecting strap can be guided and held on all circumferential sides in the at least one strap receptacle.

The at least one tab receptacle can advantageously have a corresponding insertion opening for the at least one connecting tab on its side facing the respective other housing part.

The at least one tab receptacle can advantageously be integrated in a peripheral wall of the corresponding housing part.

Advantageously, the at least one connecting strap and/or the at least one strap receptacle can extend parallel or axially to a mounting axis of the housing parts. In this way, the at least one connecting lug can be easily inserted into the at least one lug receptacle and guided there when the housing parts are assembled. The housing parts can be plugged into one another at least in sections and/or butt-jointed.

Advantageously, the housing parts can be completely or partially separated from one another in order to open the filter housing. At least the largest part of the hollow filter element, in particular the largest part of the filter medium, preferably the entire filter medium, can be accommodated in one of the housing parts, in particular the housing pot. This housing part can advantageously be coaxial with the housing axis.

At least one of the housing parts of the filter housing can advantageously have an installation opening for the hollow filter element. The installation opening can be crossed by the filter axis in the installed state of the hollow filter element, in particular it can be coaxial to the filter axis. The installation opening can be at least as large as the largest external dimension of the hollow filter element radially to the filter axis. The hollow filter element can be inserted into one housing part through the installation opening in the direction of the installation axis. Advantageously, the installation axis and/or the element axis and/or a housing axis and/or an assembly axis, in which the at least two housing parts are assembled or separated, can run parallel or coaxially to one another. In this way, the assembly of the filter can be simplified.

The installation opening for the hollow filter element can advantageously be coaxial to the housing axis. The filter element can thus be easily installed in the one housing part in the axial direction with respect to the housing axis.

The installation opening of the first housing part and thus the filter housing can be closed with the other housing part, in particular the housing cover. A part of the hollow filter element, in particular a part of a corresponding end body, can also be accommodated in the other housing part.

At least one housing seal can advantageously be provided between the housing parts. With the housing seal, an interior of the filter housing can be sealed off from the environment in the transition between the two housing parts. The at least one housing seal can have the at least one installation opening circumferentially surrounded. The housing seal can advantageously be arranged in a corresponding sealing groove in one of the housing parts.

The at least one inlet and the at least one outlet can be located on the same or on different housing parts.

Advantageously, the hollow filter element can have different radial extensions on its two end faces with respect to the filter axis, in particular the element axis. Advantageously, the hollow filter element can be inserted into one of the housing parts with the larger end face first. With the at least one leveling element, a difference in size between the installation opening and the smaller end face of the hollow filter element can be compensated for in the installed position of the hollow filter element.

The filter can advantageously be an air filter. The air filter can advantageously be part of an air intake tract of an internal combustion engine. It can be used to clean the combustion air that is supplied to the internal combustion engine.

However, the invention is not limited to an air filter of an air intake tract of an internal combustion engine of a motor vehicle, in particular a commercial vehicle. Rather, it can also be used in other types of air systems in motor vehicles. The air filter can advantageously also be a cabin filter. The filter, in particular an air filter, can also be used outside of motor vehicle technology, in particular in industrial engines. The filter can advantageously be part of a utility machine, in particular a construction machine or a utility vehicle, in particular a utility vehicle, in particular a truck, a bus, a construction machine or an agricultural machine.

The invention can also be used to clean exhaust gases from internal combustion engines or other combustion systems.

In an advantageous embodiment, the at least one connecting strap can taper towards its free edge at least in a direction transverse to its axis of extension. In this way, the insertion of the connecting lug into the corresponding lug receptacle can be simplified.

According to the invention, the filter housing has at least one guideway for guiding and/or supporting at least one leveling element of the hollow filter element. Any difference in height at the end faces of the hollow filter element can be compensated for with the at least one leveling element.

The at least one guide track, in particular at least one main guide line of the at least one guide track, can specify a path of a contact point or contact area of the leveling element when sliding on the guide track when the hollow filter element is inserted into one of the housing parts or when one of the housing parts is pushed onto the hollow filter element.

Advantageously, when the filter housing is mounted, the at least one connecting strap can be arranged on the same peripheral side of the filter housing as the at least one leveling element. In this way, the at least one leveling element can press from the inside against the at least one peripheral wall section of at least one of the housing parts and the at least one connecting strap and/or the corresponding strap receptacle can counteract from the outside.

Advantageously, when the housing is mounted, the at least one connecting strap can be arranged on the same peripheral side of the filter housing as the at least one guide track for the at least one leveling element. The connecting lug/lug receiver and the/the corresponding leveling element/guide track can advantageously be arranged circumferentially offset relative to one another.

Advantageously, the at least one guide track can be arranged radially with respect to the element axis/housing axis between the at least one leveling element and the at least one connecting lug/lug receptacle. In this way, the at least one guide track can be supported against pressure from the at least one leveling element by means of the at least one connecting strap/tab receptacle.

At least one housing part, in particular a housing cover, can advantageously have at least one guide track. The at least one guide track can advantageously extend exclusively in one of the housing parts.

The at least one guide track can extend at least with at least one imaginary main guide line in a plane with the installation axis of the hollow filter element in the housing part, in particular the housing cover, and/or the assembly axis between the housing parts.

Advantageously, a base area of the installation opening can be elongate, in particular oval. the The main guide line of the at least one guide track can be located in a secondary plane with a secondary axis of the base area of the installation opening and the installation axis.

Further features and advantages of the at least one leveling element are explained in more detail below in connection with the hollow filter element according to the invention.

In a further advantageous embodiment, a base area of the installation opening can be elongated, in particular oval, and the at least one connecting strap and the at least one tab receptacle can be located at least partially on and/or next to a secondary plane with a secondary axis of the base area of the installation opening and an installation axis of the hollow filter element the filter housing are located, if necessary, the opposing connecting straps / tab receptacles can each be located at least partially on / next to the secondary level.

Advantageously, the at least one connecting lug and the at least one lug receptacle can be located on a long side of the filter housing, which has an elongate cross section. Advantageously, the at least one connecting lug and the at least one lug receptacle can be located centrally, in particular in or near the middle, on the long side with respect to the housing axis, viewed circumferentially.

If necessary, the main guide line of the at least one guideway can advantageously be located in a secondary plane with a secondary axis of the base area of the installation opening and the installation axis. Advantageously, the main guide lines of any opposite guide tracks can each be located in the secondary plane. In this way, the at least one leveling element can be used to support and guide the at least one guide track on a long side of the filter housing. In this way, guidance and/or positioning can be further improved.

According to the invention, the at least one guide track extends into an area outside an interior of the corresponding housing part, in particular the housing cover.

In this way, the at least one leveling element can be guided at an early stage when the housing parts are assembled.

Advantageously, at least one guide arm can be provided, on which at least one guide track can be realized.

The at least one guide arm can advantageously protrude from the interior of the corresponding housing part, in particular the housing cover. In this way, the corresponding at least one leveling element can be guided on the at least one guide arm before the hollow filter element dips into the housing part.

The interior of the housing part with the at least one guide track can advantageously at least also form an inlet space section for admitting the fluid.

Advantageously, the at least one guide arm can be beveled outside of the housing part on a circumferential side facing the housing axis. The beveled peripheral side also forms the at least one guide track. The at least one guide track can thus run towards the housing axis when viewed in the direction of the housing axis towards the interior of the housing part. In this way, the insertion or placement of the at least one leveling element can be simplified.

In a further advantageous embodiment, at least two guide tracks can be located with respect to the filter axis on diagonally opposite, radially inner peripheral sides of one of the housing parts, in particular of the housing cover.

In this way, the hollow filter element can be guided, centered and/or held evenly in the filter housing by means of appropriately opposite leveling elements.

The main guide lines of the opposing guideways can each be located in the secondary plane with the secondary axis of the base area of the installation opening and the installation axis.

In a further advantageous embodiment, at least one support section for supporting at least one support element of the hollow filter element with respect to the housing axis, which can coincide with the element axis when the hollow filter element is installed, can be arranged centrally in/on the filter housing.

The at least one support section can advantageously interact with at least one support element of the hollow filter element when the filter is assembled. In this way, the positioning of the hollow filter element and/or the assembly of the at least one support element with the at least one support section can be simplified.

The at least one support section can advantageously be located on or in one of the housing parts. In this way, the at least one support section and the at least one support element can be brought together when installing the hollow filter element in one of the housing parts and/or when assembling the housing parts. In this way, assembly of the filter can be simplified.

The at least one support section can advantageously be arranged on a raw fluid side of the hollow filter element. Alternatively or additionally, at least one support section can be arranged on a clean fluid side.

Advantageously, the end face of the hollow filter element, which is opposite the at least one support element, can be supported on the other housing part.

The at least one support element and the at least one support section can advantageously have no sealing function. In this way, the support function and the sealing function can be separated from one another and optimized in each case. The sealing function can be assigned to at least one other pair of components and optimized for itself, which is separate from the at least one support element and the at least one support section.

The at least one support section can advantageously have at least one cylindrical and/or at least one conical section. A main axis of the at least one support section, in particular of the cylindrical/conical section, can advantageously run axially or parallel to the housing axis. In this way, the at least one support section and the at least one support element can have the same orientation when the hollow filter element is installed.

The main axes of the at least one support element and of the at least one support section can advantageously run coaxially when the hollow filter element is mounted. In this way, the at least one support element can be simply inserted onto and/or into the at least one support section. Advantageously, the main axes of the at least support element and the at least one support section can run parallel or axially to the installation axis of the hollow filter element relative to the filter housing and/or to the assembly axis of the housing parts, in particular to the housing part with the at least one support section, when the hollow filter element is installed. In this way, the at least one support element and the at least one support section can easily be brought into relation automatically when installing the hollow filter element in the filter housing and/or when assembling the housing parts.

The at least one support element can advantageously be complementary to the at least one support section, at least in sections. The at least one support element can thus lie flat against the at least one support section. In this way, reliable and stable support can be provided transversely, in particular radially and/or tangentially, to the element axis and/or to the housing axis.

The at least one support section can advantageously have an oval, flat-oval or round base. The at least one support section can also have a different type of base, in particular an angular base.

Advantageously, the at least one support section can have a front-side receptacle, in particular a groove, for at least one section of the at least one support element. The groove can advantageously extend circumferentially with respect to the main axis of the at least one support section. The groove can advantageously be located on an end face of the at least one support section that faces the hollow filter element. Alternatively or additionally, the at least one support section can advantageously have a hollow-cylindrical or sleeve-like section.

Advantageously, the at least one support section can be a type of pillar or dome, encompass it, or be part of it. The at least one support element of the hollow filter element can be supported on the free end of the pillar or dome. With the other end, the pillar or dome can be connected to the filter housing, in particular to the housing part that has the at least one guide track for the at least one leveling element. In particular, it can be connected in one piece to the filter housing.

The pillar or dome may advantageously extend through a space section of the filter housing. In this way, the hollow filter element can be supported at a distance bridged by the pillar or dome from a corresponding housing wall of the filter housing. Advantageously, fluid can flow through the space section during operation of the filter. Depending on the flow direction of the fluid in the filter housing, the space section can be an inlet space section or an outlet space section.

The object is also achieved by the hollow filter element in that the hollow filter element has at least one leveling element radially on the outside with respect to the element axis in an area which, when the hollow filter element is installed, overlaps a section of the filter housing or is adjacent to it, in/on which at least one connecting lug and/or at least one lug receptacle for connecting the housing parts is arranged.

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

Advantageously, the extent of the filter medium, at least in a direction radial to the element axis, can be smaller on a first of its end faces than on a second of its end faces. Advantageously, the filter medium can have a first end body at least on the smaller end face.

The at least one leveling element can be arranged radially on the outside on a first end body of the hollow filter element with respect to the element axis, in particular the filter axis.

The first end body can advantageously have at least one leveling element with respect to the element axis in the at least one direction of smaller extension with respect to the element axis in a radially outer section.

Advantageously, the at least one leveling element can be used to compensate for different distances from edges of the hollow filter element radially to the element axis on the end faces of the hollow filter element of different sizes. Height compensation can be achieved with the at least one leveling element. The hollow filter element can thus be aligned in the filter housing. Advantageously, the element axis can be aligned parallel or coaxial to the filter axis and/or to the housing axis. In particular in the case of a horizontal arrangement of the hollow filter element, in which the element axis runs horizontally, different heights on the end faces of different sizes can be compensated for in this way.

The at least one leveling element can advantageously be at least partially elastic. In this way, the hollow filter element can be fixed more easily in the filter housing. The at least one leveling element can yield and be pressed during assembly of the filter. Any tolerances, in particular production-related and/or component-related and/or assembly-related and/or operational tolerances, of the hollow filter element in the filter housing can easily be compensated for with the at least one leveling element. Furthermore, the at least one leveling element can also serve as a vibration damper, in particular when the air filter is in operation.

Alternatively or additionally, the at least one leveling element can advantageously be at least partially rigid. This can result in advantages when installing the filter. With a rigid leveling element, more precise and simpler guidance can take place on a corresponding guide section on the housing side.

The leveling element can advantageously serve as a spacer. Advantageously, by means of the at least one leveling element, a distance that is radial with respect to the element axis can be realized between the radially outer peripheral side of the first end body and a corresponding opposite section of the filter housing. Thus, a gap can be realized between the filter element in the region of the smaller end face and an inner wall of the filter housing surrounding the filter element radially on the outside. Through the gap, fluid can get into or out of a space surrounding the filter medium radially on the outside. In this way, fluid can flow in particular axially to the element axis from an inlet space section of the filter housing to the inflow side of the filter medium. In the direction of flow through the filter medium from radially outside to radially inside, the inflow side of the filter medium is on the radially outer peripheral side of the filter element. The outflow side of the filter element is then located in the interior of the element. The fluid stream can flow axially to the element axis from the outflow side of the filter medium into a corresponding outlet space section of the filter housing. Due to the axial fluid flow, an improved pack size of the filter housing and thus a smaller space requirement can be realized. Furthermore, in the case of an axial fluid flow towards the inflow side and/or away from the outflow side, a pressure difference between the inflow side and the outflow side can be reduced. In particular, a lower pressure difference can be realized than in a comparable filter in which the fluid flow is fed tangentially to the inflow side of the filter element or is diverted from the outflow side. The first end body can advantageously be or at least have an end disk.

The filter medium can be stabilized with the first end body. Furthermore, the filter medium can be sealed with the first end body on the smaller end face.

Advantageously, the element interior can be closed with the first end body on the smaller end face of the filter element. In this way, a flow of fluid out of the element interior or into the element interior can be prevented there. In this way it can be achieved that the fluid has to flow through the filter medium. The fluid can pass through the filter medium from radially outside to radially inside into the interior of the element or out of it in the opposite direction. The fluid can flow through a corresponding flow opening on the other end face of the filter element into the interior of the element or out of it.

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 tapers in the axial direction towards the element axis , a conical-oval round filter element in which the oval cross section tapers in the axial direction of the element axis at least in the direction of a transverse axis, a conical flat-oval round filter element in which the flat-oval cross section narrows in the axial direction of the element axis at least in the direction of a transverse axis tapered, or a hollow filter element with a different, in particular an angular, cross-section and/or a different cross-sectional variation in the direction of the element axis.

The at least one leveling element can advantageously be arranged on a long, in particular flat, side of an oval, in particular flat-oval, round filter element.

The at least one leveling element can advantageously be arranged on the tapered end face of a conical, in particular conical-oval or flat conical-oval, round filter element.

Advantageously, the first end body can each have a leveling element on diagonally opposite circumferential sides with respect to the element axis in the at least one direction of the smaller extent. In this way, the first end body can be supported on opposite sides against the filter housing. A more uniform and/or more precise guidance/positioning/holding in the filter housing can thus take place.

Advantageously, a base of the hollow filter element can be elongated, in particular oval, at least in the area of the smaller end face, and an imaginary center point of the at least one leveling element can be located on a secondary axis of an imaginary plane that runs parallel to the base of the hollow filter element. If necessary, the center points of opposing leveling elements can each be located on the secondary axis. In this way, the first end plate can be supported approximately centrally on its corresponding long sides. In this way, support and/or guidance can be improved.

The minor axis is the short axis of the elongated surface through its center. In contrast, the major axis is the long axis of the oblong surface through its center.

Advantageously, the at least one leveling element can extend at least radially, in particular radially and axially, outwards over the radially outer peripheral side of the filter medium. The at least one leveling element can thus enable radial support. With the at least one leveling element, a distance can be achieved between a radially outer peripheral side of the filter medium and a corresponding peripheral side of the filter housing.

If the at least one leveling element also protrudes beyond the filter medium in the axial direction, axial support can also be provided. In this way, tilting or canting of the at least one end body relative to the element axis can be counteracted.

A distance between a radially outer peripheral side of the at least one leveling element and the element axis can advantageously correspond approximately to a distance between the corresponding radially outer peripheral side of the hollow filter element and the element axis on the larger end face.

In this way, the hollow filter element can be aligned with its element axis uniformly parallel or coaxial to the housing axis.

Alternatively or additionally, a distance between the radially outer peripheral side of the at least one leveling element and the element axis can advantageously be greater than a corresponding distance between the radially outer peripheral side of the hollow filter element, in particular an end body there, on the larger end face. In this way, different diameters of the filter housing can be compensated for at the respective end faces of the hollow filter element.

The at least one leveling element can advantageously be arranged spatially below in the final installation position of the hollow filter element in a filter housing of the filter in its usual operating position. At least one can do that Leveling element support the hollow filter element against gravity against the filter housing.

Advantageously, the at least one direction of the smaller extent in the final installation position can run spatially vertically in the usual operating position. Advantageously, the element axis can run spatially horizontally in the installation position in the usual operating position.

In an advantageous embodiment, the hollow filter element can have at least one support element on an outer side facing away from the interior of the element.

The at least one support element and thus the hollow filter element can be supported at least transversely to the element axis, in particular radially or tangentially to the element axis or radially to another axis which is parallel to the element axis. In this way, the hollow filter element can be additionally positioned and held in the radial direction with respect to the element axis.

The at least one support element can advantageously also be supported in the axial direction with respect to the element axis in the filter housing. In this way, the axial position of the hollow filter element can also be improved. The hollow filter element can advantageously be clamped and held in the axial direction between two opposing support sections of the filter housing.

Advantageously, at least one support element can be arranged centrally with respect to the element axis on the smaller end face of the hollow filter element. The hollow filter element can thus be centrally supported. In this way, improved support of the hollow filter element on the filter housing can take place with only one support element and only one corresponding support section. In this way, the support can be implemented with a small space requirement for the components required for this purpose in the filter housing.

The at least one support element can advantageously be at least partially elastic. In this way, any installation tolerances of the hollow filter element in the filter housing can easily be compensated for with the at least one support element.

Furthermore, the at least one support element can also serve as a vibration damper, in particular when the filter is in operation.

The at least one support element can have at least one cylindrical and/or at least one conical section. A main axis of the at least one support element can run axially or parallel to the element axis. The support element can be supported against at least one corresponding support section on the side of the filter housing, transversely and/or axially to the element axis.

The at least one support element can advantageously have an oval, flat-oval or round base. It can also have a different type of base, in particular an angular base.

The at least one support element can advantageously have a hollow-cylindrical or sleeve-like section.

The at least one support element can have a cavity open to the at least one support section of the filter housing. A corresponding projection of the at least one support section can dip into the cavity. In this way the support can be improved.

The hollow-cylindrical or sleeve-like section of the at least one support element can advantageously be inserted into a corresponding front-side receptacle, in particular a groove, of the at least one support section when the hollow filter element is correctly installed. The groove can be viewed as a hollow space in the support section, which is open towards the free end face of the support section.

The at least one support element can advantageously be arranged on the first end body of the hollow filter element.

The advantages and features shown above in connection with the filter housing according to the invention and the hollow filter element according to the invention and their advantageous embodiments apply correspondingly to the filter according to the invention and its advantageous embodiments.

Advantageously, an inlet-side inlet space section, an element space section in which the hollow filter element can be arranged, and an outlet-side outlet space section of the filter housing can be arranged linearly and one behind the other along the flow path of the fluid through the filter. In this way, the fluid can flow axially towards the upstream side of the filter medium in a simple manner. Furthermore, an axial outflow of the filtered fluid from the clean fluid side of the hollow filter element can be achieved in this way. Any pressure differences between the clean fluid side and the raw fluid side can be reduced in this way. Advantageously, a main stream Direction of flow of the fluid from the inlet space section through the element space section into the outlet space section can be essentially axial to the element axis and/or to the housing axis.

character list

• 1 eine Draufsicht eines Luftfilters einer Brennkraftmaschine mit einem aus einem Gehäusetopf und einem Gehäusedeckel zusammengesetzten Filtergehäuse, in dem ein austauschbares konisch-ovales Rundfilterelement angeordnet ist;
• 2 einen querseitigen Schnitt des Luftfilters aus 1 entlang der dortigen Schnittlinie II-II;
• 3 einen längsseitigen Schnitt des Luftfilters aus 1 entlang der dortigen Schnittlinie III-III;
• 4 eine erste isometrische Schrägansicht des Luftfilters aus 1 bis 3;
• 5 eine zweite isometrische Schrägansicht des Luftfilters aus 1 bis 4;
• 6 eine isometrische Darstellung des offenen Gehäusetopfs des Luftfilters aus 1 bis 5 mit dem Rundfilterelement;
• 7 eine isometrische Darstellung des offenen Gehäusetopfs des Luftfilters aus 1 bis 6, hier ohne Rundfilterelement;
• 8 eine isometrische Darstellung des offenen Gehäusetopfs des Luftfilters aus 1 bis 7 ohne Rundfilterelement aus einer anderen Perspektive;
• 9 eine isometrische Darstellung des Gehäusedeckels des Luftfilters aus 1 bis 5 mit dem Rundfilterelement ohne Gehäusetopf;
• 10 eine isometrische Darstellung des Gehäusedeckels des Luftfilters aus 1 bis 5 ohne Rundfilterelement;
• 11 die isometrische Darstellung des Gehäusedeckels aus 10 aus einer anderen Perspektive;
• 12 eine Seitenansicht des Luftfilters aus 1 bis 5 in einer frühen Montagephase des Gehäusedeckels auf den Gehäusetopf;
• 13 eine Draufsicht des Luftfilters in der Montagephase aus 12;
• 14 eine Draufsicht des Luftfilters in einer der in 13 dargestellten Montagephase folgenden Montagephase;
• 15 eine isometrische Darstellung des Rundfilterelements des Luftfilters aus den 1 bis 5;
• 16 einen querseitigen Längsschnitt des Rundfilterelements des Luftfilters aus den 1 bis 5;
• 17 eine längsseitige Seitenansicht des Rundfilterelements des Luftfilters aus den 1 bis 5;
• 18 eine querseitige Seitenansicht des Rundfilterelements des Luftfilters aus 1 bis 5;
• 19 eine Draufsicht auf eine einlassseitige Endscheibe des Rundfilterelements des Luftfilters aus 1 bis 5.

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

• 1 a top view of an air filter of an internal combustion engine with a filter housing composed of a housing pot and a housing cover, in which an exchangeable conical-oval round filter element is arranged;
• 2 Make a cross section of the air filter 1 along the section line II-II there;
• 3 cut the length of the air filter 1 along the section line III-III there;
• 4 a first isometric oblique view of the air filter 1 until 3 ;
• 5 a second isometric oblique view of the air filter 1 until 4 ;
• 6 an isometric view of the open air cleaner housing bowl 1 until 5 with the round filter element;
• 7 an isometric view of the open air cleaner housing bowl 1 until 6 , here without round filter element;
• 8th an isometric view of the open air cleaner housing bowl 1 until 7 without round filter element from a different perspective;
• 9 An isometric view of the air cleaner housing cover 1 until 5 with the round filter element without housing pot;
• 10 An isometric view of the air cleaner housing cover 1 until 5 without round filter element;
• 11 the isometric representation of the housing cover 10 from a different perspective;
• 12 a side view of the air filter 1 until 5 in an early assembly phase of the housing cover on the housing pot;
• 13 a plan view of the air filter in the assembly phase 12 ;
• 14 a plan view of the air filter in one of the in 13 illustrated assembly phase following assembly phase;
• 15 an isometric representation of the round filter element of the air filter from the 1 until 5 ;
• 16 a transverse longitudinal section of the round filter element of the air filter from 1 until 5 ;
• 17 a longitudinal side view of the round filter element of the air filter of the 1 until 5 ;
• 18 shows a lateral side view of the round filter element of the air filter 1 until 5 ;
• 19 a plan view of an inlet-side end disk of the round filter element of the air filter 1 until 5 .

The same components are provided with the same reference symbols in the figures.

embodiment(s) of the invention

In the 1 until 14 an air filter 10 of an internal combustion engine of a commercial vehicle is shown in different representations and assembly phases. The air filter 10 is arranged in an air intake tract of the internal combustion engine. It is used to clean the combustion air that is fed to the internal combustion engine for combustion.

The air filter 10 includes an openable filter housing 12. The filter housing 12 is flat-oval. The filter housing 12 is flattened in the direction of its short transverse axis compared to an oval filter housing with an approximately elliptical cross section. In 3 a section along a short transverse axis of the filter housing 12 is shown. The filter housing 12 has a housing pot 14 in which 1 and 3 Left. The housing pot 14 has an installation opening 16, for example in the 6 until 8th is shown in the foreground for installing a filter element 18. The installation opening 16 is provided with a housing cover 20, in 1 right, closed.

The housing pot 14 has an outlet 22 for the filtered air, which opens into an outlet space section 24 of the housing pot 14 . The outlet 22 is connected to the internal combustion engine outside of the filter housing 12 via air lines (not shown).

The housing cover 20 has an inlet 26 for air to be filtered, which in a Inlet space section 28 of the housing cover 20 opens and outside of the filter housing 12 is connected to the environment.

The filter element 18 is arranged in an element space section 30 of the housing pot 14 in such a way that it separates the inlet 26 from the outlet 22 . The element space section 30 is in a linear arrangement between the inlet space section 28 and the outlet space section 24.

The inlet space section 28 , the element space section 30 and the outlet space section 24 are arranged one behind the other axially to a filter axis 32 . In 3 the filter axis 32 is shown for the sake of better comprehension, although it is outside of the sectional plane III-III 1 , namely in front of the drawing plane.

In the exemplary embodiment shown, the filter axis 32 coincides with a housing axis of the filter housing 12 and with an installed filter element 18 with an element axis of the filter element 18 . In the present case, the filter axis 32 also coincides with an installation axis along which the filter element 18 can be inserted into the housing pot 14 and removed from it. The filter axis 32 also coincides with a mounting axis along which the housing cover 20 is mounted on the housing pot 14 . For the sake of better clarity and comprehensibility, the axes listed above are briefly referred to as “filter axis 32” in the exemplary embodiment explained in the description. Whenever “axial”, “radial”, “circumferential” or “coaxial” is mentioned in the following, this refers to the filter axis 32 unless otherwise stated.

The installation opening 16 surrounds the filter axis 32 circumferentially. When the filter element 18 is installed, the filter axis 32 intersects the installation opening 16. The inner dimension of the installation opening 16 is larger than the largest outer dimension of the filter element 18 radially to the filter axis 32. A base area of the installation opening 16 is elongated flat oval.

In the end face of the free edge of the housing cover 20 is one, in particular in the 3 and 9 until 11 shown sealing groove 33 arranged with a housing seal. The housing seal lies tightly against the corresponding end face of the free edge of the housing pot 14 and surrounds the installation opening 16 circumferentially in a closed manner.

The housing pot 14 has a circumferentially closed sealing surface 34 axially between the element space section 30 and the outlet space section 24 . The sealing surface 34 extends in the radial direction. The sealing surface 34 faces the housing cover 20 . A seal 36 of the filter element 18 lies tightly against the sealing surface 34 in a circumferentially closed manner.

The radially inner cross-section of the element space section 30 is larger than a radially outer cross-section of the sealing surface 34.

An annular inflow space 38 is implemented between a radially outer peripheral side of the filter element 18 and the radially inner peripheral side of the element space section 30 . The inflow annular space 38 is separated from the outlet space section 24 by means of the seal 36 .

On the side facing the housing cover 20 , the annular inflow space 38 is connected to the inlet space section 28 via a circumferential gap 40 . The inlet chamber section 28 and the inflow ring section 38 are located on the raw air side of the filter element 18.

A support pillar 42 is arranged on the housing cover 20 . The support pillar 42 is connected to the housing cover 20 in one piece. It is approximately coaxial to the filter axis 32. It is arranged centrally with respect to the filter axis 32. The support pillar 42 extends in the inlet space section 28 from an inner side of the housing cover 20 facing the filter element 18 to an inlet-side end face 66 of the filter element 18. The support pillar 42 is located on the raw air side of the filter medium 64.

On the filter element 18 facing free end face of the pillar 42 is one, for example in the 10 and 11 shown, to a main axis of the support pillar 42, ie to the filter axis 32, circumferentially extending coaxial counter-support groove 44 is arranged. The counter-support groove 44 is an annular cavity in the pillar 42 which is open to the free end face of the pillar 42 .

The housing pot 14 also has two connecting lugs 46 for connection to the housing cover 20 . The connecting lugs 46 are located on the opposite flattened peripheral sides of the housing pot 14 with respect to the filter axis 32 . The connecting lugs 46 extend parallel to the assembly axis of the housing cover 20 with the housing pot 14, i.e. parallel to the filter axis 32. Imaginary central axes of the connecting lugs 46 lie in an imaginary plane with the filter axis 32. This imaginary plane, viewed in the direction of the filter axis 32, is inclined relative to a others ren imaginary plane with a secondary axis of the oval installation opening 16. The imaginary central axes of the connecting straps 46 are, as for example in 2 recognizable, on opposite sides offset laterally to the minor axis.

The inner sides of the connecting straps 46 facing one another are smooth. The insides of the connecting lugs 46 each form an initial section of corresponding guide ramps 48. The guide ramps 48 continue on the inside of the housing pot 14. The respective radially outer peripheral sides of an outlet-side end disk 50 of the filter element 18 are guided on the guide ramps 48 when the filter element 18 is installed in the housing pot 14 .

The outer sides of the connecting lugs 46 facing away from one another are equipped with stabilizing profiles.

At their free edges facing away from the free peripheral edge of the housing pot 14, the connecting lugs 46 taper in the manner of a wedge. This simplifies the insertion of the connecting lugs 46 into corresponding lug receptacles 52 of the housing cover 20 for connecting the housing pot 14 to the housing cover 20.

The housing cover 20 has two tab receptacles 52 . The tab receptacles 52 each fit to one of the connecting tabs 46 of the housing pot 14.

The tab receptacles 52 are located on the opposite flattened peripheral sides of the housing cover 20 with respect to the filter axis 32 . They are each arranged in one piece in the area of the free peripheral edge of the housing cover 20 . The tab receptacles 52 are integrated into the peripheral wall of the housing cover 20 .

The tab receptacles 52 each extend parallel to the assembly axis of the housing cover 20 with the housing pot 14, i.e. parallel to the filter axis 32. Imaginary center axes of the tab receptacles 52 lie in a plane with the filter axis 32. This plane is inclined relative to an imaginary one when viewed in the direction of the filter axis 32 Plane with a minor axis of the oval installation opening 16. The central axes of the tab receptacles 52 are thus, analogous to the central axes of the connecting tabs 46, laterally offset on opposite sides to the minor axis.

The tab receptacles 52 are circumferentially closed depressions with respect to their respective center axis, which runs parallel to the filter axis 32 . The connecting lugs 46 are each held in the corresponding lug receptacle 52 on all circumferential sides. The tab receptacles 52 have a corresponding insertion opening 54 for the corresponding connecting tab 46 on their side facing the housing pot 14 . The sealing groove 33 runs around the tab receptacles 52 radially on the outside. Thus, the interior spaces of the tab receptacle 52 are sealed off from the environment.

When the housing cover 20 is mounted, the connecting lugs 46 stabilize the peripheral wall sections of the housing cover 20 mechanically. The connecting tabs 46 support the peripheral wall sections radially to the filter axis 32, ie radially to the element axis and to the housing axis.

The housing cover 20 also has two guideways 56 for guiding and supporting corresponding leveling elements 58 of the filter element 18 . The guideways 56 are, for example, in the 9 until 11 recognizable. With respect to the filter axis 32, the guide tracks 56 are located on diagonally opposite, radially inner peripheral sides of the housing cover 20.

The guide tracks 56 are each implemented on a guide arm 60 . The guide arms 60 are connected in one piece to the respective radially inner peripheral side of the peripheral wall of the housing cover 20 within an interior space of the housing cover 20 , which also forms the inlet space section 28 . The opposite longitudinal sides of the guide arms 60 form the corresponding guide tracks 56.

The guide arms 60 each protrude from the interior of the housing cover 20 . Outside the housing cover 20, the guide arms 60 are each beveled on the radially inner longitudinal sides with the guide tracks 56. The corresponding guideways 56 thus run towards the filter axis 32 in the direction of the filter axis 32 viewed towards the interior of the housing cover 20 .

The guide tracks 56 each extend with an imaginary main guide line 62 in a plane with the assembly axis, i.e. the filter axis 32, of the housing cover 20 with the housing cup 14 and the filter element 18. The main guide lines 62 provide a path when the housing cover 20 is attached to the filter element 18 of a contact area of the corresponding leveling element 58 when sliding on the corresponding guideway 56. The main guide lines 62 are located in an imaginary secondary plane that is spanned by the secondary axis of the flat-oval base surface of the installation opening 16 and the filter axis 32 .

The filter element 18 described in more detail below is in the 15 until 19 shown in different perspectives and cuts. The filter element 18 is a flat, conical-oval round filter element. The filter element 18 is coaxial to the element axis, ie to the filter axis 32. The filter element 18 has a flat-oval cross-section. The short transverse axis, i.e. the minor axis, of the oval lies in the plane of the drawing 15 , the long transverse axis, i.e. the main axis, is perpendicular to the plane of the drawing. The filter element 18 is additionally flattened in the direction of the short transverse axis, hence the designation “flat conical-oval”. In contrast, "oval" denotes an approximately elliptical cross-section. A radially outer peripheral side and a radially inner peripheral side of the filter element 18 each have a conical course in the direction of the filter axis 32 . The outer cross section and the inner cross section of the filter element 18 taper from its outlet-side end face 68 facing the outlet chamber section 24 to the inlet-side end face 66 .

The direction of the minor axis of the flat-oval filter element 18 runs spatially vertically in the final installation position in the usual operating position. The filter axis 32 runs spatially horizontal in the installed position in the usual operating position.

The filter element 18 comprises a filter medium 64 which is folded in a zigzag shape to form a filter bellows and is closed circumferentially with respect to the element axis, ie the filter axis 32. The filter medium 64 is a filter fleece which is suitable for filtering air.

The expansion of the filter bellows made of filter medium 64 in the direction radially to the element axis, i.e. to the filter axis 32, on its inlet-side end face 66 is smaller than on its outlet-side end face 68.

The filter medium 64 is connected to the end disk 50 on the outlet side on its outlet-side end face 68 . The outlet-side end plate 50 is coaxial to the filter axis 20. The outlet-side end plate 50 is made of a plastic. It is tightly glued to the end face 68 of the filter medium 64 . The radially outer peripheral side of the end disk 50 on the outlet side rests with minimal play on the radially inner peripheral side of the housing pot 14 there.

The outlet-side end plate 50 has a central, coaxial outflow opening 70. The outflow opening 70 extends over the entire radially inner cross section of the filter medium 64. The outflow opening 70 is an element interior 72 of the filter element 18, which is surrounded by the filter medium 64, with which Outlet space section 24 connected.

The seal 36 is arranged on the outside of the outlet-side end disk 50 that is axially opposite to the filter medium 64 . The seal 36 is made of resilient polyurethane foam. It is foamed onto the end plate 50 on the outlet side. The seal 36 is coaxial to the element axis, ie to the filter axis 32, and surrounds the outflow opening 70 on the circumference. It extends in the axial direction. It is supported in the axial direction on the sealing surface 34 of the housing pot 14 .

On the inlet-side end face 66 the filter medium 64 is tightly connected to an inlet-side end disk 74 . The end disk 74 on the inlet side is made of polyurethane. The end disk 74 on the inlet side closes the element interior 72 towards the inlet chamber section 28 . The inlet-side end disk 74 is tightly connected to the filter medium 64 in a manner similar to the outlet-side end disk 50 .

A coaxial support tube 76 extends in the interior space 72 of the element between the end disk 74 on the inlet side and the end disk 50 on the outlet side. The support tube 76 is made of plastic. It is structured like a grid. Its peripheral side is permeable to air. The support tube 76 has a flat conical-oval shape corresponding to the filter medium 64 . The radially inner peripheral side of the filter medium 64 can be supported on the radially outer peripheral side of the support tube 76 .

A support element 78 is arranged on the axial outside of the inlet-side end disk 74 facing away from the element interior 72 . The support element 78 is located on the raw air side of the filter medium 64. The support element 78 is firmly connected to the end disk 74 on the inlet side. The support element 78 is made of an elastic polyurethane foam. The support element 78 is foamed onto the end plate 74 on the inlet side.

The support element 78 is sleeve-like. It has the shape of a hollow cylinder, the main axis of which extends coaxially to the filter axis 32, ie to the element axis, in the exemplary embodiment shown. A cavity 80 of the support element 78 is open on its end face remote from the end disk 74 on the inlet side. The support element 78 has an approximately oval cross section. Its short transverse axis lies in 16 in the plane of the drawing, its long transverse axis is perpendicular to the plane of the drawing. When the filter element 18 is installed, the orientation of the support element 78 with respect to the filter axis 32 corresponds to the orientation of the support pillar 42 of the housing cover 20.

The section of the support pillar 42 surrounded by the counter-support groove 44 is inserted into the cavity 80 of the support element 78 when the filter element 18 is correctly installed. The peripheral wall of the support element 78 is inserted into the counter-support groove 44 of the support pillar 42 .

On its free side facing away from the end disk 74, the wall thickness of the support element 78 decreases in a conical section towards the free edge. In this way, the insertion of the support element 78 into the counter-support groove 44 of the support pillar 42 can be simplified.

The filter element 18 is supported against the filter housing 12 via the support pillar 42 with the support element 48 . The support is radial, ie transverse to the filter axis 32, ie transverse to the element axis and the housing axis, and axially. Through the interaction of the support element 48 with the support pillar 42, the filter element 18 is also held and positioned radially and axially on the inlet side, that is to say on the raw air side. In this way, the filter element 18 can be kept in the filter housing 12 on the side facing the inlet space section 28 .

Furthermore, two support webs 82 are arranged on the radially outer edges of the end disk 74 on the inlet side in the area of the short transverse sides. The support webs 82 each protrude beyond the inlet-side end disk 74 both in the radial direction and in the axial direction. The support webs 82 are each based on corresponding, including in the 3 , 10 and 11 shown, support points 83 on the inside of the housing cover 20 in the radial direction.

The leveling elements 58 already mentioned above are located on the inlet-side end plate 74 with respect to the element axis, ie the filter axis 32, radially on the outside. The leveling elements 58 are made of polyurethane. They are connected in one piece to the end plate 74 on the inlet side. The leveling elements 58 are arranged on an unfiltered air side of the filter element 18 .

The leveling elements 58 are arranged on circumferential sides of the inlet-side end disk 74 which are diagonally opposite with respect to the filter axis 32 . Imaginary centers of the leveling elements 58 are located on a minor axis of a flat-oval cross section of the filter element 18. In the direction of the minor axis, the filter bellows of the filter element 18 has a smaller radial extent on the inlet-side end face 66 than on the outlet-side end face 68. The minor axis lies in an imaginary plane which runs parallel to the flat-oval base surface of the filter element 18 . The minor axis is the short axis of the imaginary plane through its center. In contrast, the main axis is the long axis of the imaginary plane through its center.

The leveling elements 58 each extend radially and axially outwards over the radially outer peripheral side of the filter bellows of the filter medium 64 and the inlet-side end disk 74.

The distances between the radially outer peripheral sides of the leveling elements 58 and the filter axis 32 correspond to the respective distances between the corresponding radially outer peripheral side of the outlet-side end disk 50 and the filter axis 32.

One of the leveling elements 58 is arranged spatially below in the final installation position of the filter element 18 in the filter housing 12 in its usual operating position. The other leveling element 58 is spatially at the top, perpendicularly above the first-mentioned leveling element 58 .

A radial distance between the radially outer circumference of the inlet-side end disk 74 and an opposite radially inner circumference of the housing cover 20 for forming the gap 40 is realized by means of the leveling elements 58 with respect to the filter axis 32 .

When the filter housing 12 is installed, the tab receptacles 52 with the connecting tabs 46 are each arranged approximately on the same circumferential side of the filter housing 12 as one of the guide tracks 56 for one of the leveling elements 58. The tab receptacles 52/connecting tabs 46 and the corresponding leveling elements 58/guide tracks 56 arranged circumferentially offset from one another, with the tab receptacles 52/connecting tabs 46 overlapping with the corresponding leveling elements 58/guide tracks 56 viewed in the radial direction.

The guide tracks 56 are each arranged between one of the leveling elements 58 and one of the bracket receptacles 52/connecting bracket 46. The guideways 56 are supported against pressure from the leveling elements 58 by means of the connecting lugs 46/lug receptacles 52. The leveling elements 58 press against the corresponding peripheral wall section of the housing cover 20 from the inside. The connecting lugs 46 and the corresponding lug receptacles 52 each hold against this from the outside.

During operation of the air filter 10, the air to be filtered flows through the inlet 26, in 1 indicated by an arrow 84, into the inlet space section 28. From there, the air travels essentially in the axial direction through the gap 40 into the inflow annular space 38 on the inflow side of the filter mediums 64. The air flows through the filter medium 64 from radially outside to radially inside and is cleaned. The cleaned air flows through the peripheral side of the support tube 76 and enters the element interior 72. The cleaned air leaves the element interior 72 essentially in the axial direction and enters the outlet space section 24. From there, the filtered air leaves the filter housing 12 through the outlet 22, in 1 indicated by arrow 86.

The filter housing 12 can be opened for maintenance purposes, for example for cleaning or replacing the filter element 18 . For this purpose, the housing cover 20 is removed from the housing pot 14 in the axial direction. In the process, the support element 78 is automatically pulled out of the counter-support groove 44 at the end of the support pillar 42 . The connecting tabs 46 are pulled out of the tab receptacles 52 . The leveling elements 58 slide along the guideways 56 . The filter element 18 is pulled out of the element space section 30 of the housing pot 14 in the axial direction. It can be replaced with a new filter element 18 or reinstalled after cleaning.

For installation, the filter element 18 is inserted with the outlet-side end disk 50 first in the axial direction into the housing pot 14 until the seal 36 rests against the sealing surface 34 . The housing cover 20 is then placed with its open side first in the axial direction onto the installation opening 16 of the housing pot 14 . For this purpose, the connecting lugs 46 are inserted into the respective lug receptacle 52 . The housing cover 20 is thus pre-adjusted on the housing pot 14 .

When the housing cover 20 is slid onto the housing pot 14 in the axial direction, the connecting lugs 46 and the lug receptacles 52 act together as a guide aid. As soon as the free ends of the guide arms 60 of the housing cover 20 reach the leveling elements 58, the guide arms 60 engage around the leveling elements 58 from the outside on radially opposite sides. When the housing cover 20 is pushed on further, the leveling elements 58 are then guided along the main guide lines 62 of the guide tracks 56 of the guide arms 60 . The side of the filter element 18 with the end plate 74 on the inlet side is continuously raised into its end position by means of the lower guide tracks 56 as the housing cover 20 is pushed further. The filter element 18 is positioned and centered in the housing cover 20 . Finally, when pushed further, the support element 78 of the housing cover 20 is automatically inserted into the counter-support groove 44 of the support pillar 42 . The radially inner section at the end of the support pillar 42 engages in the cavity 80 of the support element 78 . When installed correctly, the element axis runs coaxially to the housing axis. Finally, the housing cover 20 is fixed to the housing pot 14 in a manner that is of no further interest here.

Claims (8)

Filter housing (12) of a filter for fluid, in particular air, water, fuel, oil or urea solution, in particular an air filter (10), in particular an internal combustion engine, in particular a motor vehicle, in particular a commercial vehicle, which has at least one inlet (26) for the fluid to be cleaned and has at least one outlet (22) for cleaned fluid and in which a hollow filter element (18) with a filter medium (64) for filtering the fluid, which surrounds an element interior (72) with respect to a filter axis (32), can be interchangeably arranged in this way that it separates the at least one inlet (26) from the at least one outlet (22), the filter housing (12) having at least two housing parts (14, 20) which are used to release at least one installation opening (16) of the filter housing (12) for the hollow filter element (18) can be at least partially separated from each other, characterized in that at least one of the housing parts (14) has at least one e Connecting lug (46) and at least one other of the housing parts (20) has at least one lug receptacle (52) matching the at least one connecting lug (46) for inserting the at least one connecting lug (46) to connect the housing parts (14, 20), and that the filter housing (12) has at least one guideway (56) for guiding and/or supporting at least one leveling element (58) of the hollow filter element (18), the at least one guideway (56) extending into an area outside of an interior (28) of the corresponding housing part extends. filter housing claim 1 , characterized in that the at least one connecting strap (46) tapers towards its free edge at least in a direction transverse to its axis of extension. filter housing claim 1 or 2 , characterized in that the at least one guideway (56) extends into a region outside of an interior (28) of the housing cover (20). Filter housing according to one of the preceding claims, characterized in that at least two guide tracks (56) with respect to the filter axis (32) are on diagonally opposite, radially inner peripheral sides of one of the housings parts, in particular the housing cover (20), are located. Filter housing according to one of the preceding claims, characterized in that at least one support section (42) for supporting at least one support element (78) of the hollow filter element (18) with respect to the housing axis (32), which can coincide with the element axis when the hollow filter element (18) is installed , is arranged centrally in / on the filter housing (12). Hollow filter element (18), in particular a conical-oval round filter element, of a filter for fluid, in particular air, water, fuel, oil or urea-water solution, in particular an air filter (10), in particular of an internal combustion engine, in particular of a motor vehicle, in particular of a commercial vehicle, which in a Filter housing (12), in particular according to one of the preceding claims, can be arranged in such a way that it separates at least one inlet (26) of the filter housing (12) for fluid to be cleaned from at least one outlet (22) for cleaned fluid, with a filter medium ( 64) for filtering the fluid which circumferentially surrounds an element interior (72) with respect to an element axis (32), characterized in that the hollow filter element (18) has at least one leveling element (58) radially on the outside with respect to the element axis (32) in a Area which, when the hollow filter element (18) is installed, overlaps a section of the filter housing (12) or is adjacent to it is in/on which at least one connecting strap (46) and/or at least one strap receptacle (52) for connecting the housing parts (14, 20) is arranged. Hollow filter element claim 6 , characterized in that the hollow filter element (18) has at least one support element (78) on an outer side facing away from the element interior (72) on an end face (66). Filter for fluid, in particular air, water, fuel, oil or urea solution, in particular an air filter (10), in particular an internal combustion engine, in particular a motor vehicle, in particular a commercial vehicle, with a filter housing (12) according to one of Claims 1 until 5 which is composed of at least two housing parts (14, 20) which can be separated from one another at least in part in order to release at least one installation opening (16) in the filter housing (12), and in which a hollow filter element (18) according to one of Claims 6 or 7 is arranged interchangeably.

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