DE102021004996A1 - Fluid filter for a motor vehicle and filter cartridge for a fluid filter - Google Patents

Abstract

The invention relates to a fluid filter (12) for a motor vehicle, having a filter housing (28) and a filter cartridge (10). An insertion opening (38) of the filter housing (28), through which a filter body (16) of the filter cartridge (10) is introduced into the filter housing (28), is closed by a cover (14). The cover (14) arranged on the filter body (16) of the filter cartridge (10) is brought into a closed position by turning it about a rotary axis (22). The cover (14) has a plurality of closure strips (20) which are arc-shaped in a top view taken in the direction of the axis of rotation (22). The closure strips (20) protrude in the radial direction over a base body (18) of the cover (14). When the cover (14) is in the closed position, the closure strips (20) engage behind retaining strips (26) provided on the side of the filter housing (28), which are curved in plan view in the direction of the axis of rotation (22). The invention also relates to a filter cartridge (10) for such a fluid filter (12).

Description

The invention relates to a fluid filter for a motor vehicle, with a filter housing and a filter cartridge. In this case, an insertion opening of the filter housing, via which a filter body of the filter cartridge is introduced into the filter housing, is closed by means of a cover. Furthermore, the invention relates to a filter cartridge for such a fluid filter.

The DE 10 2019 004 927 B3 describes a fluid filter for a motor vehicle, in which a filter cartridge is fixed to a housing pot of a filter housing of the fluid filter. In this case, a spiral web of a holding element which is arranged on a bottom of the filter cartridge and has an L-shaped cross section engages behind a holding web which is provided on the side of the housing pot. In this case, the holding web protrudes from a wall which is arranged on a base of the housing pot. By rotating the filter cartridge about its longitudinal axis, the web of the holding element of the filter cartridge can engage behind the holding web of the housing pot.

The configuration of such a fixing device provided for fixing the filter cartridge in the housing pot can, in particular due to the shape of the holding element, entail difficulties with regard to the demoulding of components of the filter cartridge.

Provision can furthermore be made for a cover to be fixed to a filter housing of a fluid filter by screwing. In this case, the cover must be unscrewed from the filter housing in order to exchange or change the filter cartridge. Such an unscrewing of the cover from the filter housing is comparatively complex, in particular time-consuming.

The object of the present invention is to create a fluid filter of the type mentioned at the outset, in which the cover is brought into a closed position in a particularly simple manner, and to specify a corresponding filter cartridge for such a fluid filter.

This object is achieved by a fluid filter having the features of patent claim 1 and by a filter cartridge having the features of patent claim 4 . Advantageous configurations with expedient developments of the invention are specified in the dependent patent claims and in the following description.

The fluid filter according to the invention for a motor vehicle comprises a filter housing and a filter cartridge, with an insertion opening of the filter housing, through which a filter body of the filter cartridge is introduced into the filter housing, being closed by a cover. In this case, the cover arranged on the filter body of the filter cartridge is brought into a closed position by rotating it about a rotation axis. The cover has a plurality of closure strips which are arcuate in a plan view taken in the direction of the axis of rotation. The closure strips protrude beyond a base body of the cover in the radial direction. Furthermore, when the cover is in the closed position, the closure strips engage behind retaining strips provided on the side of the filter housing. In the top view taken in the direction of the axis of rotation, the retaining strips are also designed in an arc shape.

Due to the curved or arcuate course of the closure strips associated with the cover on the one hand and the retaining strips associated with the filter housing on the other hand, the retaining strips reach behind the retaining strips over a particularly long distance or an undercut arrangement of the closure strips behind the retaining strips when the cover is in its closed position is spent, in which the cover closes the insertion opening of the filter housing.

In particular, a very large overlapping or overlapping of the closure lines with the retaining strips can be achieved, with an overall length of the overlap being greater than 50 percent of an outer circumference of the lid. In the case of a cover with a bayonet lock, on the other hand, an overlapping or overlapping between the closure elements of the cover and the closure elements corresponding thereto on the side of the filter housing can be achieved by less than 50 percent of an outer circumference of the cover. Consequently, by means of the arcuate closure strips, a particularly good closure effect can be achieved when the insertion opening of the filter housing is closed by means of the cover.

In addition, in contrast to a cover that can be screwed onto a filter housing, a very slight rotation of the cover about the axis of rotation is already sufficient to bring the cover into the closed position. The cover can therefore be brought into the closed position in a particularly simple manner.

Furthermore, the cover can also be detached from the filter housing again very easily and quickly, for example when the filter cartridge, which comprises the filter body and the cover arranged on the filter body, is to be replaced.

The fact that the filter body is held on the cover also ensures that the filter body of the filter cartridge is inserted into the filter housing when the insertion opening of the filter housing is closed by means of the cover. In other words, when the cover is closed, the fluid filter can only be operated with the filter body present in the filter housing. This is advantageous with regard to the fact that a good filtration performance can then be reliably achieved by means of a filter material of the filter body, through which the fluid to be filtered flows during operation of the fluid filter.

The arched shape of the closure strips gives the cover the appearance of a paddle wheel in the top view of the cover in the direction of the axis of rotation, in which the arcuate closure strips projecting in the radial direction beyond the base body form curved blades of the paddle wheel or are similar to them. In particular, the closure strips are curved in an arc-shaped manner counter to a direction of rotation in which the cover can be rotated in order to bring it into the closed position.

Because the closure strips protrude in the radial direction beyond the base body of the cover, the sum of the individual lengths of the respective closure strips allows a particularly large length of undercut gripping behind the retaining strips due to the closed position of the cover. This is advantageous with regard to a secure mounting of the cover on the filter housing and a secure closure of the insertion opening of the filter housing in the closed position of the cover.

By providing a larger number of closure strips, a particularly high level of stability of the individual closure strips can be achieved. This is because, distributed over the circumference of the lid, a comparatively large number of closure strips, each of which has a shorter length, or fewer and therefore longer closure strips can easily be accommodated. The provision of a larger number of closure strips is also accompanied by a reduction in the angle of rotation through which the cover has to be rotated about the axis of rotation in order to bring the cover into the closed position.

In contrast, the length of a transmission line, along which a closing force acts when the respective holding strip is gripped behind with the corresponding closing strip, is greater the fewer closing strips the cover has overall. Therefore, by specifying a suitable number of closure strips, both a comparatively small twisting angle for bringing the cover into its closed position and very good retention of the cover brought into its closed position can be achieved.

In contrast to straight closure strips, the curved closure strips have the advantage that a line along which force is transmitted when the cover is held on the filter housing is particularly long, in particular longer than would be the case with straight closure strips. In addition, reaching behind the holding strips, which are also arch-shaped, with the locking strips of the cover is particularly simple and process-reliable. Because when the filter housing is closed by means of the cover, i.e. when the cover is brought into the closed position, the arcuate closure strip preferably engages the likewise arcuate retaining strip over its entire length, as soon as the retaining strip is gripped from behind.

If, on the other hand, the closure strips and the retaining strips are straight or extend along a straight line, then the closure strip engages the retaining strip only at certain points when the lid is brought into the closed position. In other words, the closure strip initially engages behind the retaining strip only in a very small area and not over the entire length of the retaining strip. Only with increasing rotational movement does the straight retaining strip increasingly grip behind along the likewise straight closure strip. Providing straight closure strips and retaining strips can therefore entail difficulties when bringing the lid into the closed position, in particular because the lid can get caught.

In contrast, due to the provision of the arcuate closure strips, with which the likewise arcuate retaining strips correspond in terms of shape, snagging or blocking of the lid when it is brought into the closed position is largely prevented or minimized. Therefore, the arcuate or curved shape of the locking ledges is conducive to easy placement of the lid in the locked position.

Depending on the intended use and configuration of the fluid filter, different fluids can be filtered by means of a filter material of the filter cartridge, which can be provided or present in particular in the area of the filter body of the filter cartridge. For example, the fluid filter can be designed as an air filter of an air conditioning or ventilation system of the motor vehicle, using wel Chem ambient air can be filtered before entering a passenger compartment of the motor vehicle. However, the fluid filter can also be designed as an air filter of an internal combustion engine of the motor vehicle or as a filter for filtering fuel. Furthermore, it is possible for the fluid filter to be designed as an oil filter or as a water separator for separating water, for example from a lubricant and/or a fuel. It is also possible for the fluid filter to be designed as an air dryer, by means of which the humidity in a motor vehicle system containing air, in particular compressed air, can be reduced, for example the humidity of the compressed air in a braking system of the motor vehicle.

The retaining strips are preferably formed on a collar part of the filter housing, with the collar part running around the insertion opening in the circumferential direction. The provision of the collar part is conducive to high stability of the retaining strips.

The collar part preferably protrudes in the radial direction beyond a housing pot of the filter housing, with the filter body of the filter cartridge being accommodated in the housing pot. As a result, a starting position of the cover and an end position of the cover, in which the cover is brought into its closed position, are particularly easily recognizable or obvious to a person involved in the assembly of the filter cartridge. In the initial position, the closure strips projecting radially beyond the base body of the lid are spaced apart from the retaining strips in the direction of rotation, and in the end position the closure strips are overlapped by the retaining strips in the direction of the axis of rotation.

The starting position, from which the cover can be brought into the end position or closed position by turning about the axis of rotation, is particularly clearly recognizable when the intermediate spaces provided between the respective retaining strips in the collar part correspond in shape to the arched shape of the closing strips.

The collar part preferably comprises a ring body, with the retaining strips being connected to the ring body in a first end region remote from the axis of rotation, and the retaining strips merging into a respective connecting wall in a second end region near the axis of rotation, which is connected to the housing pot. This ensures that the holding strips are held in a particularly stable manner in the collar part, and the holding strips are particularly robust. The respective connecting wall or support wall preferably extends essentially in the direction of the axis of rotation.

The filter cartridge according to the invention for a fluid filter of a motor vehicle comprises a filter body which can be introduced into the filter housing via an insertion opening of a filter housing of the fluid filter. In this case, the insertion opening can be closed by means of a cover, which is arranged on the filter body of the filter cartridge. The lid can be brought into a closed position by rotating it about a rotary axis. The cover has a plurality of closure strips which, in a top view taken in the direction of the axis of rotation, are arcuate and protrude in the radial direction beyond a base body of the cover. The closure strips are designed to engage behind retaining strips provided on the side of the filter housing in the closed position of the cover, which are arc-shaped in the top view taken in the direction of the axis of rotation.

The filter cartridge is thus provided and designed in particular for assembly or installation in the filter housing of the fluid filter according to the invention.

Because of the arched shape of the closure strips that protrude beyond the base body of the cover in the radial direction, the cover can be brought into the closed position particularly easily. In comparison to a cover that can be screwed to a filter housing, rotating the cover about the axis of rotation with a comparatively small angle of rotation is already sufficient to bring or move the cover into the closed position.

In addition, due to the shape of the closure strips corresponding to the retaining strips, i.e. due to the arc shape of the closure strips, a very extensive engagement behind the retaining strips or a very extensive undercut of the closure strips of the cover with the retaining strips of the filter housing can be achieved. This is conducive to a very secure mounting of the cover on the filter housing.

In addition, due to the provision of a plurality of closure strips, any loads are particularly evenly distributed. Furthermore, due to the large area of contact between the closure strips and the holding strips when the cover is in the closed position, forces acting on the cover and/or forces acting on the filter housing can be absorbed particularly well by the closure strips. This is particularly advantageous with regard to withstanding pressure forces occurring during operation of the fluid filter.

Preferably, the filter body of the filter cartridge is permanently attached to the cover. With In other words, it is preferably provided that the filter body can be detached from the cover only at the expense of destroying and/or damaging the filter body and/or the cover. This ensures that when the insertion opening of the filter housing is closed by means of the cover, the filter body, which preferably has a filter material designed for filtering the fluid, is also replaced together with the cover. In addition, the fluid filter can only be operated with the filter body inserted into the filter housing, provided that the insertion opening is closed by means of the cover.

The closure strips preferably have respective contact surfaces with which the closure strips rest against respective mating contact surfaces of the retaining strip when the lid is in the closed position. This is conducive to a secure holding of the lid in the closed position.

It can be provided that the contact surfaces are aligned inclined to the axis of rotation, the inclination of the contact surfaces corresponding at least essentially to the inclination of the counter-contact surfaces of the retaining strips. With such a design of the cover, increasing rotation of the cover about the axis of rotation for the purpose of bringing the cover into the closed position results in increasing clamping of the cover with the filter housing in the manner of screwing the cover. However, with such an embodiment, a comparatively steep incline is to be provided due to the short twisting path or small twisting angle through which the cover is to be rotated about the axis of rotation into the closed position. And if there is such a steep incline or slope of the contact surfaces and the mating contact surfaces, good self-locking of the cover cannot be achieved.

Provision is therefore preferably made for the contact surfaces of the closure strips to be aligned perpendicular to the axis of rotation. The contact surfaces of the closure strips can then be moved easily and with little friction along the counter-contact surfaces of the holding strips, which are preferably also aligned perpendicularly to the axis of rotation. This is advantageous with regard to the easy bringing of the cover into the closed position. In addition, due to the flat shape of the contact surfaces, very good self-locking of the cover in the closed position can be achieved even with a comparatively short twisting path or comparatively small twisting angle.

In addition, lower manufacturing tolerances must be observed than would be the case if the contact surfaces and the mating contact surfaces have comparatively steep and mutually corresponding inclinations. Therefore, the planar shape of the contact surfaces, which are aligned perpendicularly to the axis of rotation, is also advantageous with regard to simple manufacture of the filter cartridge.

Preferably, the closure strips each have a similar arc shape. This simplifies the assembly of the filter cartridge. This is because it is not necessary to pay attention to which sealing strip is introduced into which intermediate space which is formed in each case between holding strips of the filter housing which are adjacent in the circumferential direction.

It has also been shown to be advantageous if the closure strips are arranged equidistantly from one another in the circumferential direction around the axis of rotation. This is particularly advantageous with regard to the simplicity of assembling the filter cartridge.

It is also advantageous if the closure strips are curved in an arcuate manner counter to a direction of rotation in which the cover can be rotated to bring it into the closed position. In this way, a very effective gripping behind the holding strips corresponding to the closure strips can be achieved during assembly of the filter cartridge, during which the cover arranged on the filter body of the filter cartridge is brought into its closed position closing the insertion opening.

The closure strips preferably protrude from a respective holding web of the lid in a direction of rotation in which the lid can be rotated to bring it into the closed position. The provision of such holding webs ensures that the closure strips are particularly robust, since the respective holding web stabilizes the respective closure strip.

The respective holding web is preferably curved in an arc shape counter to the direction of rotation. Thus, a stop for the rotational movement of the lid when the same is brought into the closed position can be provided by the holding web. This applies in particular if the arched shape of the holding web corresponds to the arched shape of a narrow side of the respective holding strip.

Additionally or alternatively, the respective holding web can have a wall area which extends from a flange area of the base body in the direction of the axis of rotation. This gives the holding web a very high level of stability and robustness, which is advantageous for stabilizing the closure strips which are arranged on the holding webs or which extend away from the respective holding web. This applies in particular when the closure strips are formed in one piece with the base body of the lid.

Preferably, the flange area is ring-shaped, so that the flange area runs around the axis of rotation. With an advantageously low weight of the cover, such a flange area ensures a high level of robustness of the base body.

The closure strips are preferably supported on the base body by means of a respective support element of the cover counter to a direction of rotation in which the cover can be rotated to bring it into the closed position. The support element can be formed by a wall area or a wall part of the cover, which is preferably formed in one piece with the base body. Such supporting elements assigned to the respective closure strip make it possible to achieve a particularly high degree of robustness of the closure strips with regard to the loads occurring when the cover is twisted in the direction of rotation.

The closure strips are preferably formed in one piece with an annular flange area of the base body, with the annular flange area bearing against a front edge of a housing pot of the filter housing when the cover is in the closed position. In this way, the closure strips are positioned very precisely in relation to the front edge of the housing pot when the insertion opening of the filter housing is closed or is closed by means of the cover.

Further advantages, features and details of the invention result from the following description of preferred exemplary embodiments and from the drawings. The features and combinations of features mentioned above in the description and the features and combinations of features mentioned below in the description of the figures and/or shown alone in the figures can be used not only in the combination specified in each case, but also in other combinations or on their own, without going beyond the scope of the leave invention.

• 1 ausschnittsweise und in einer Perspektivansicht eine Filterkartusche für einen Fluidfilter eines Kraftwagens;
• 2 ausschnittsweise und in einer Perspektivansicht ein Filtergehäuse des Fluidfilters, wobei ein Filterkörper der Filterkartusche gemäß 1 in einen Gehäusetopf des Filtergehäuses einbringbar ist;
• 3 einen Schritt während der Montage der Filterkartusche, während welchem der Filterkörper der Filterkartusche in den Gehäusetopf des Filtergehäuses eingebracht wird;
• 4 ausschnittsweise eine Schnittdarstellung eines Kragenteils des Filtergehäuses;
• 5 einen weiteren Schritt bei der Montage der Filterkartusche, wobei sich der Deckel der Filterkartusche in einer Ausgangsstellung befindet;
• 6 ausschnittsweise eine Schnittdarstellung des Fluidfilters im Bereich des Kragenteils des Filtergehäuses, wobei sich der Deckel in der in 5 gezeigten Ausgangsstellung befindet;
• 7 ausschnittsweise den Fluidfilter, wobei der Deckel der Filterkartusche in seine Verschlussstellung verdreht ist;
• 8 ausschnittsweise eine Schnittdarstellung des Fluidfilters im Bereich des Kragenteils des Filtergehäuses, wobei der Deckel in seine Verschlussstellung gemäß 7 verbracht ist;
• 9 in einer vergrößerten Detaildarstellung eine Draufsicht auf den Fluidfilter bei in die Verschlussstellung verbrachtem Deckel;
• 10 in einer vergrößerten Detaildarstellung eine Draufsicht auf den Fluidfilter bei einer Variante des Fluidfilters;
• 11 eine unterseitige Ansicht auf eine Verschlussleiste des Deckels und eine mit der Verschlussleiste korrespondierende Halteleiste des Filtergehäuses, wobei sich der Deckel in der Ausgangsstellung befindet;
• 12 eine unterseitige Ansicht auf die Verschlussleiste des Deckels und die mit der Verschlussleiste korrespondierende Halteleiste des Filtergehäuses, wobei sich der Deckel in seiner Verschlussstellung befindet; und
• 13 ausschnittsweise eine Variante der Filterkartusche, bei welcher die Verschlussleisten des Deckels mittels Abstützelementen verstärkt sind.

show:

• 1 detail and in a perspective view of a filter cartridge for a fluid filter of a motor vehicle;
• 2 sectional and in a perspective view of a filter housing of the fluid filter, wherein a filter body of the filter cartridge according to 1 can be introduced into a housing pot of the filter housing;
• 3 a step during the assembly of the filter cartridge, during which the filter body of the filter cartridge is introduced into the housing pot of the filter housing;
• 4 a detail of a sectional view of a collar part of the filter housing;
• 5 a further step in the assembly of the filter cartridge, the cover of the filter cartridge being in a starting position;
• 6 A detail of a sectional view of the fluid filter in the area of the collar part of the filter housing, with the cover being in the in 5 shown starting position is;
• 7 detail of the fluid filter, the cover of the filter cartridge being rotated into its closed position;
• 8th a sectional view of the fluid filter in the area of the collar part of the filter housing, the cover being in its closed position according to FIG 7 is spent;
• 9 in an enlarged detailed representation, a plan view of the fluid filter with the cover in the closed position;
• 10 in an enlarged detailed representation a plan view of the fluid filter in a variant of the fluid filter;
• 11 a view from below of a closure strip of the cover and a retaining strip of the filter housing corresponding to the closure strip, with the cover being in the initial position;
• 12 an underside view of the closure strip of the cover and the retaining strip of the filter housing corresponding to the closure strip, with the cover being in its closed position; and
• 13 detail of a variant of the filter cartridge, in which the closure strips of the cover are reinforced by means of support elements.

Elements that are the same or have the same function are provided with the same reference symbols in the figures.

In 1 a filter cartridge 10 for a fluid filter 12 of a motor vehicle is shown partially and in perspective, wherein the fluid filter 12 with built-in filter cartridge 10 is partially shown in approximately 7 is shown.

The fluid filter 12 can be designed as an air filter for an air conditioning system and/or as an air filter for an internal combustion engine of the motor vehicle be that Additionally or alternatively, the fluid filter 12 can be designed as an oil filter or as a water separator or as an air dryer.

From the filter cartridge 10 are in 1 a cover 14 and a detail of a filter body 16 are shown. The filter body 16 has, in a manner known per se, a filter material (not shown here) through which the fluid to be filtered flows in order to separate dirt, for example, from the fluid.

The cover 14 comprises a base body 18, which is round in the present case, and a plurality of closure strips 20. In 1 an axis of rotation 22 is indicated, about which the cover 14 and together with this the filter body 16 can be rotated in order to move the cover 14 into its in 7 to spend shown closed position. The axis of rotation 22 preferably coincides with a longitudinal axis, in particular a central longitudinal axis, of the essentially circular-cylindrical filter body 16 in the variant of the filter cartridge 10 shown as an example.

In particular, in a top view of the cover 14 taken in the direction of the axis of rotation 22, ie when looking at the cover 14 in the direction of the axis of rotation 22, the present arcuate shape of the closure strips 20 can be clearly seen. Furthermore, the closure strips 20, of which for reasons of clarity in 1 only some are provided with a reference number, in the radial direction over the base body 18 of the cover 14 over. Overall, in a plan view of the cover 14 in the direction of the axis of rotation 22, the cover 14 has the shape of a bucket wheel, in which the closure strips 20 are similar in shape to curved buckets of the bucket wheel.

In the present case, the closure strips 20 are curved in an arcuate manner counter to a direction of rotation 24, in which the cover 14 is rotated to move the cover 14 from the in 5 to the starting position shown in 7 closed position shown is to rotate about the axis of rotation 22. This direction of rotation 24 is in 5 illustrated by a corresponding curved arrow.

Corresponding numbers of retaining strips 26 , which are provided or provided on the side of a filter housing 28 of the fluid filter 12 , correspond to the closure strips 20 of the cover 14 . The filter housing 28 is partially and in perspective in 2 shown. in 2 only some of the arcuate holding strips 26 are also provided with a reference number.

According to 2 the filter housing 28 has a housing pot 30, which in the present case is essentially circular-cylindrical. The filter body 16 of the filter cartridge 10 can be inserted or introduced into this housing pot 30 of the filter housing 28 when the filter cartridge 10 is inserted into the filter housing 28, ie the filter cartridge 10 is assembled.

Out of 2 It can also be seen that the retaining strips 26 of the filter housing 28 , which serve as counter strips for the closure strips 20 , are also arc-shaped in the top view taken in the direction of the axis of rotation 22 . In this case, the arcuate shape of the closure strips 20 corresponds to the arcuate shape of the retaining strips 26. Correspondingly, both the closure strips 20 and the retaining strips 26 are curved in an arcuate manner counter to the direction of rotation 24, in which the cover 14 is moved to the closed position (cf 7 ) is rotatable.

Intermediate spaces 32 are formed between holding strips 26 adjacent to one another in the circumferential direction, the width of which in the circumferential direction of the cover 14 is greater than a width of the closure strips 20 in the present case 1 , but also from the sectional views in 6 and 8th It is clearly evident that the closure strips 20 in the present case protrude in the direction of rotation 24 from a respective holding web 34 of the lid. Like the closure strips 20 , the holding webs 34 are preferably formed in one piece with the base body 18 of the cover 14 .

A width of the respective interspaces 32 between the holding strips 26 adjacent to one another in the direction of rotation 24 is preferably greater than a width of the respective holding web 34 and the respective closure strip 20 associated or associated with the respective holding web 34 . As a result, the holding webs 34 together with the closure strips 20 protruding from the holding webs 34 can be introduced very well into the respective intermediate spaces 32 when the filter cartridge 10 is installed.

Out of 2 It can also be seen that the retaining strips 26 are formed on a collar part 36 of the filter housing 28, which runs around an insertion opening 38 of the filter housing 28 in the circumferential direction, into which the filter body 16 is inserted when the filter cartridge 10 is installed (cf 3 ). The collar part 36 is present in the radial direction over the housing pot 30 of the filter housing 28, wherein the filter body 16 of the Filter cartridge 10 is accommodated in the housing pot 30 when the filter cartridge 10 is mounted.

According to 2 In the present case, the collar part 36 comprises an annular body 40 which serves to hold and stabilize the holding strips 26 . In particular from 2 in synopsis with 4 it can be seen here that the respective retaining strips 26 are connected to the annular body 40 in a first end region 42 remote from the axis of rotation 22 . Furthermore, in a second end region 44 close to the axis of rotation 22, the retaining strips 26 merge into a connecting wall 46, which is connected to an outside of the housing pot 30 (cf 4 ). The connecting wall 46 (cf 4 ) preferably additionally stabilizes the respective associated holding strip 26 .

In 3 the insertion of the filter body 16 of the filter cartridge 10 into the housing pot 30 of the filter housing 28 is illustrated by an arrow 48, the arrow 48 preferably extending in the direction of the axis of rotation 22, which in particular coincides with the central axis or central longitudinal axis of the filter body 16.

In 5 the next step in assembling the filter cartridge 10 is shown. Accordingly, the cover 14 is now in its initial position, in which the closure strips 20 and the retaining webs 34 assigned to the respective closure strip 20 are arranged in the interspaces 32 which are formed between the retaining strips 26 of the filter housing 28 .

Furthermore, from the view of the fluid filter 12 in 5 a connecting piece 50 can be seen, via which the fluid to be filtered by means of the filter material of the filter body 16 can be introduced into the housing pot 30 of the filter housing 28 and/or removed from the housing pot 30 .

In 6 the cover 14 and the filter housing 28 are shown in section in the area of the collar part 36 . From this view it can be seen in particular that in this starting position or first end position of the cover 14 the closure strips 20 do not yet engage behind the holding strips 26 . Furthermore, in 6 a sleeve-shaped bush part 52 of the cover 14 is shown in section, which is preferably formed in one piece with the base body 18 of the cover 14. This socket part 52 is inserted a little way into the housing pot 30 .

In the present case, bushing part 52 has a sealing element, for example in the form of a sealing ring 54, on an outer side facing housing pot 30, which in 6 is shown cut and which is also in 1 and in 3 is recognizable.

In 7 the fluid filter 12 is shown with the cover 14 brought into its closed position, ie rotated about the axis of rotation 22 in the direction of rotation 24 . Accordingly, here the closure strips 20 of the cover 14 engage behind the respective holding strips 26 which are formed on the side of the filter housing 28 . Furthermore, when the cover 14 is in the closed position, the retaining webs 34 preferably rest against a respective narrow side 56 of the retaining strips 26 (cf 6 combined with 8th ).

Especially from a synopsis of 5 with 8th It can also be seen that the closure strips 20 are formed in one piece with an annular flange area 58 of the base body 18 . This annular flange portion 58 is according to 8th on a front edge 60 of the housing pot 30 when the cover 14 is in the in 7 and in 8th shown closed position is spent.

In particular from 6 and 8th It is also clearly evident that contact surfaces 72, with which the closure strips 20 bear against respective mating contact surfaces 74 of the retaining strips 26 when the cover 14 is in the closed position, are aligned perpendicularly to the axis of rotation 22. Likewise, the mating contact surfaces 74 of the retaining strips 26 have a planar shape aligned perpendicular to the axis of rotation 22 . As a result, a very good self-locking of the cover 14 can be achieved in the closed position.

Regarding 9 and 10 further advantages are to be explained which are associated with the provision of the arcuate closure strips 20 which, in terms of their shape, correspond to the likewise arcuate retaining strips 26 which are provided on the side of the filter housing 28 . As can be seen in particular from the sectional views in 6 and 8th As can be seen, an L-profile is essentially formed by the holding webs 34 and the closure strips 20 protruding from the holding webs 34 .

A force acting on the cover 14, the direction of which corresponds to that in 3 Arrow 48 shown is opposite when the cover 14 is brought into its closed position, also acts on these closure strips 20. And a force that acts on the filter housing 28 in a direction which is in 3 illustrated by the arrow 48 acts on the holding strips 26 which are associated with the filter housing 28 . The force introduced from the filter housing 28 is here in the region of a transmission line 62 in the respective closure strip 20 transferred. An approximate course of the transmission line 62, which is formed on a front edge in the direction of rotation 24 of the horizontally extending closure strip 20, is shown in FIG 9 specified.

In a manner analogous to that explained for the closure strip 20 , the force introduced from the cover 14 is transmitted in the region of this transmission line 62 to the respective holding strip 26 which is associated with the filter housing 28 . Here the force is transmitted in particular at a transition from a horizontal area of the holding strip 26 to the connecting wall 46 extending in the vertical direction or along the axis of rotation 22 (cf 4 and 6 ), which stabilizes the respective holding strip 26 in the present case. Out of 9 it can be seen that the transmission line 62 has a comparatively great length.

If the lengths of the respective transmission lines 62 of all closure strips 20 of the lid 14 are added and if the sum thus obtained is placed in relation to an outer circumference of the lid 14, which in this case essentially corresponds to the circumference of the annular body 40, then a degree of overlapping of the closure strips 20 be determined with the holding strips 26 based on this outer circumference.

At the in 9 shown exemplary shape of the closure strips 20, this degree of overlap or overlap portion corresponds to about 85 percent of the outer circumference. This applies to the in 1 number of 15 closure strips 20 of the cover 14 shown as an example. With this configuration of the cover 14, it is also sufficient to turn the cover 14 in the direction of rotation 24 by only an angle of about 8° in order to move the cover 14 from the starting position (cf 5 ) into the closed position (compare 7 ) to spend.

At the in 10 shown configuration of the closure strips 20, the arcuate shape of which can be seen from the shape of the retaining webs 34 that essentially correspond to these, the length of the respective transmission line 62, which is assigned to the respective closure strip 20, is greater than in the case of the 9 shown variant of the lid 14. For the in 10 The lid 14 shown has a smaller number of closure strips 20, and the respective closure strips 20 are somewhat more delicate than in the variant according to FIG 1 and accordingly according to 9 the case is.

For example, at the in 10 In the variant of the cover 14 shown as a detail, the cover 14 has only six closure strips 20 which correspond to a corresponding number of retaining strips 26 of the filter housing 28 . In this embodiment, the sum of the lengths of the transmission lines 62 of all closure strips 20 corresponds to approximately 88 percent of the outer circumference of the cover 14 or of the ring body 40. In this case in 10 shown variant, a rotation of the cover 14 about the axis of rotation 22 in the direction of rotation 24 of about 17 ° is sufficient to move the cover 14 from the 5 into the starting position shown in 7 to spend shown closed position.

Out of 9 and from 10 It is immediately apparent that the overlap portion, which is dependent on the length of the respective transmission line 62, is significantly greater than with a bayonet lock. This is because, due to the design, a cover with a bayonet catch can only have an overlap of less than 50 percent, with the overlap being expressed as the ratio of the sum of the individual lengths of the transmission lines to the outer circumference of the cover.

The overlapping portion, which is larger in relation to a cover with a bayonet lock, which is expressed in a particularly large area behind the retaining strips 26 by means of the locking strips 20, ensures that the cover 14 is held particularly securely on the filter housing 28. In addition, the pressure on the cover 14 The load acting on the sealing strips 20, which are arranged equidistantly from one another in the circumferential direction, is distributed very evenly.

Out of 11 combined with 12 Other benefits of providing the arcuate closure strips 20 are readily apparent. First, for a given dimension of the lid 14 and filter housing 28 and a given number of closure strips 20, the respective transmission line 62 is substantially longer than would be the case if the closure strips 20 extended in a straight direction.

In addition, it depends 11 As can be seen, there is a gap 64 that is uniform or essentially the same width at every point between the respective closure strip 20 and the retaining strip 26 associated with this closure strip 20 when the cover 14 is not yet in the closed position. This entails that when the cover 14 is turned in the direction of rotation 24 , the respective locking strip 20 does not just reach behind the holding strip 26 at certain points. Rather, the closure strip 20 engages behind the retaining strip 26 assigned to this closure strip 20 over the entire length of the closure bar 20 (compare 12 ). As a result, the cover 14 is largely prevented from getting caught when it is rotated in the direction of rotation 24 and thus when it is brought into the closed position.

In 13 a further variant of the cover 14 is shown as a detail, in which the closure strips 20 are particularly positionally stable. On the one hand, the respective retaining web 34 ensures that the respective closure strip 20 is stabilized. Furthermore, the respective closure strips 20 are supported on the base body 18 by means of a respective support element 66 of the cover 14 .

This support element 66, designed in the manner of a horizontal wall part, extends from the respective holding web 34 to a vertical wall 68 of the base body 18. The provision of the support elements 66 largely prevents the closure strips 20 extending away from the holding webs 34 from buckling.

Furthermore, the respective retaining bar 34 in the in 13 shown embodiment of the cover 14 has a wall area 70, which extends starting from the annular flange area 58 of the cover 14 in the direction of the axis of rotation 22. The wall areas 70 embodied in the manner of reinforcing ribs ensure additional stabilization of the wall 68 , this stabilization helping to support the closure strips 20 .

QUOTES INCLUDED IN DESCRIPTION

This list of documents cited by the applicant was 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.

Patent Literature Cited

• DE 102019004927 B3 [0002]

Claims (10)

Fluid filter for a motor vehicle, with a filter housing (28) and a filter cartridge (10), with an insertion opening (38) of the filter housing (28) through which a filter body (16) of the filter cartridge (10) is introduced into the filter housing (28). , is closed by means of a cover (14), characterized in that the cover (14) arranged on the filter body (16) of the filter cartridge (10) is brought into a closed position by rotating it about an axis of rotation (22), the cover (14 ) has a plurality of closure strips (20), which in a plan view taken in the direction of the axis of rotation (22) are arcuate and which protrude in the radial direction beyond a base body (18) of the lid (14), the closure strips (20) in the closed position of the cover (14) on the side of the filter housing (28) engage behind retaining strips (26) which are arcuate in plan view in the direction of the axis of rotation (22). fluid filter after claim 1 , characterized in that the retaining strips (26) are formed on a collar part (36) of the filter housing (28), the collar part (36) running around the insertion opening (38) in the circumferential direction, and the collar part (36) running in the radial direction projects beyond a housing pot (30) of the filter housing (28) in which the filter body (16) of the filter cartridge (10) is accommodated. fluid filter after claim 2 , characterized in that the collar part (36) comprises a ring body (40), wherein the retaining strips (26) are connected to the ring body (40) in a first end region (42) remote from the axis of rotation (22), and wherein the retaining strips ( 26) in a second end region (44) near the axis of rotation (22) merge into a respective connecting wall (46) which is connected to the housing pot (30). Filter cartridge for a fluid filter (12) of a motor vehicle, wherein a filter body (16) of the filter cartridge (10) can be inserted into the filter housing (28) via an insertion opening (38) of a filter housing (28) of the fluid filter (12), and wherein the insertion opening (38) closable by means of a cover (14) is characterized in that the cover (14) is arranged on the filter body (16) of the filter cartridge (10) and can be brought into a closed position by rotating it about an axis of rotation (22), the cover (14) has a plurality of closure strips (20) which, in a top view taken in the direction of the axis of rotation (22), are of arcuate design and which protrude in the radial direction beyond a base body (18) of the lid (14), the closure strips ( 20) are designed to engage behind retaining strips (26) provided on the side of the filter housing (28) in the closed position of the cover (14), which are arcuate in plan view in the direction of the axis of rotation (22). filter cartridge claim 4 , characterized in that the filter body (16) of the filter cartridge (10) is permanently attached to the cover (14). filter cartridge claim 4 or 5 , characterized in that the closure strips (20) have respective contact surfaces (72) with which the closure strips (20) rest against respective mating contact surfaces (74) of the holding strips (26) in the closed position of the cover (14), the contact surfaces (72 ) of the closure strips (20) are aligned perpendicular to the axis of rotation (22). Filter cartridge according to one of Claims 4 until 6 , characterized in that the closure strips (20), which are arranged equidistantly from one another in particular in the circumferential direction around the axis of rotation (22), each have a similar arcuate shape, in particular are curved in an arcuate manner counter to a direction of rotation (24), in which the cover (14) for Spend in the closed position is rotatable. Filter cartridge according to one of Claims 4 until 7 , characterized in that the closure strips (20) protrude from a respective holding web (34) of the lid (14) in a direction of rotation (24), in which the lid (14) can be rotated to bring it into the closed position, the respective holding web (34) is arcuately curved counter to the direction of rotation (24) and/or the respective holding web (34) has a wall area (70) which, starting from an in particular annular flange area (58) of the base body (18), extends in the direction of the axis of rotation (22) extends. Filter cartridge according to one of Claims 4 until 8th , characterized in that the closure strips (20) counter to a direction of rotation (24) in which the cover (14) can be rotated to bring it into the closed position, by means of a respective support element (66) of the cover (14) on the base body (18) are supported. Filter cartridge according to one of Claims 4 until 9 , characterized in that the closure strips (20) are formed in one piece with an annular flange area (58) of the base body (18), the annular flange area (58) in the closed position of the lid (14) rests against a front edge (60) of a housing pot (30) of the filter housing (28).

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