WO2013178680A1

WO2013178680A1 - Filter device

Info

Publication number: WO2013178680A1
Application number: PCT/EP2013/061067
Authority: WO
Inventors: Claude Frédéric Gebler; Markus PREIßINGER; Valentin Ruffet; Frank Stange
Original assignee: Mahle International Gmbh
Priority date: 2012-05-31
Filing date: 2013-05-29
Publication date: 2013-12-05
Also published as: EP2854986A1; DE102012209242A1

Abstract

The invention relates to a filter device (1), particularly for a motor vehicle, having: - a filter housing (2); - a housing cover (3) mounted on the filter housing (2) and having a housing cover discharge opening (4); - a filter element (5) which is connectable or connected to the housing cover (3), has a filter element discharge opening (6) and separates a dirty side (7) from a clean side (8) in the filter housing (2) when mounted in the filter housing (2); - a closure element (9) which is or can be attached to the housing cover (3), and closes off both the housing cover discharge opening (4) and the filter element discharge opening (6) when attached to the housing cover (3); - wherein the closure element (9) has a first radial seal (12) by means of which the closure element (9), when attached to the housing cover (3), seals off the dirty side (7) from the clean side (8) in the filter element discharge opening (6).

Description

filtering device

The present invention relates to a filter device, in particular for a motor vehicle. The invention further relates to a filter element of such a filter device and a motor vehicle with such a filter device.

Filtering devices are often used as oil filters in motor vehicles, in which they have an oil-care function for the oil used, for example, in an internal combustion engine of the motor vehicle. Such filter devices have, in a known manner, a ring filter element which, for example, flows through from the outside to the inside so that a spatial area within the ring filter element forms a clean side of the filter device and a spatial area arranged outside the ring filter element forms a raw side of the filter device. Such a filter device usually has a filter housing, on which a housing cover can be fastened. The ring filter is then inserted into the housing cover attached to the filter housing, so that the ring filter separates the raw side from the clean side of the filter device in a state of the housing cover mounted in the filter housing.

For filtering a fluid, for example an oil (if the filter device is an oil filter), the filter housing can now have a feed opening in fluid communication with the raw side and a discharge opening in fluid communication with the clean side. The fluid to be filtered flows via the feed opening into the clean side of the filter device, then flows through the ring filter element from the raw side to the clean side of the filter device, and leaves the clean side again through the discharge opening. In the filter device, both in the raw side so-called. Soiled oil and in the clean side by means of the ring filter filtered oil can now remain. At the

Changing the filter element may occur when removing the lid

Uncontrolled wise both dirt oil and filtered oil from the

Filter device to the outside.

DE 200 12 736 U1 describes an assembly for an internal combustion engine with an oil filter. The oil filter has a first housing structure, in which a replaceable filter element is installed, so that it can be flowed through by the lubricating oil of the internal combustion engine. The housing structure further has an oil drain, which can be released upon removal of the filter element. The assembly further comprises a second housing structure, which in turn has a channel structure for the passage of the fluid located in the oil circuit. The oil drain and the channel structure of the oil filter open into one another, so that they have a common line section.

DE 10 2005 022 932 A1 relates to an oil filter arrangement having a housing which has a receiving space for a filter element which can be inserted into the housing and can be flowed through radially with oil. The receiving space is closed with a lid, wherein at the bottom of the receiving space is surrounded by a pipe socket pure oil or crude oil and an opening extending in the longitudinal direction of the receiving space channel space is provided.

DE 37 38 718 A1 describes an oil filter with a drain plug. The oil filter further comprises a housing which passes through a filter body in a

Dirty oil room and a clean oil room is divided. The outer of the two rooms is permanently connected to a closed by the drain plug bottom space of the housing. This compound is formed by holes in a lying below the filter body transverse wall, which is a for having inner space leading, aligned with the drain plug further opening. This opening is closed during operation of the filter by the end face of the shaft of the drain plug.

It is an object of the present invention to provide an improved

Embodiment for a filter device to provide, in which

in particular in a controlled manner both dirt oil and filtered oil can be drained from the filter device as needed.

The above object is solved by the subject matter of the independent claims. Preferred embodiments are subject of the dependent claims.

The present invention is based on the general idea for which

Filter device to provide a closure element, which on the

Housing cover of the filter device is attachable, so that it closes in a mounted on the housing cover both a housing cover idle opening and a filter element idling opening of the filter device or by removing the closure element of the

Housing cover releases both openings simultaneously.

For this purpose, the closure element according to the invention a first radial seal, by means of which the closure element in which on the

Housing cover attached state seals the raw side of the filter device against the clean side. By means of the filter device according to the invention at the same time both in the clean side accumulated filtered oil and accumulated in the raw side dirty oil in a simple manner from the

Filter device to be removed. For this purpose, the closure element according to the invention can be removed from the housing cover of the filter device so that then both the raw side and the clean side of the

Filter device is open to the outside, so that there hinannnneltes dirty oil or unfiltered oil can flow out of the filter device.

The filter device according to the invention thus enables a simultaneous

Emptying both the clean side and the raw side of filtered oil or dirt oil. In particular, it is not necessary in the filter device according to the invention to carry out such an emptying process separately both for the raw side and for the clean side, since the inventive

Closing element simultaneously closes the raw and the clean side of the filter device to the outside and also seals the raw side against the clean side.

The implementation of such an emptying process is particularly useful when the filter element is to be replaced. Before the

actual replacement of the filter element, both the raw and the clean side of the filter device according to the invention as described above can be emptied in a simple manner, so that then the subsequent

Replacing the filter element does not present the risk of contamination due to leaking waste oil or filtered oil.

After completion of the emptying process, the closure element can be re-attached to the housing cover and the original operating state of the filter device can be restored. An elaborate separate opening of the raw and clean side, for example by means of two separate

Closure elements, omitted in the filter device according to the invention.

In a preferred embodiment, the first radial seal of the closure element may be a first annular sealing element arranged on an outer circumferential surface of the closure element in a first annular groove by means of which the first radial seal in which on the

Housing cover attached state of the closure element in the

Filter element idling opening seals the raw side against the clean side. In this way, a particularly good sealing effect between the raw side and the clean side of the filter device can be achieved.

Preferably, the first radial seal may have a circular cylindrical radial sealing contour, by means of which the first radial seal in the mounted on the housing cover state of the closure element in the

Filter element idling opening seals the raw side against the clean side. This allows a particularly simple and thus cost-effective production of the filter device according to the invention.

In a further embodiment, the closure element may comprise a second radial seal, by means of which the closure element seals a housing interior to the outside in the state in the housing cover idling opening mounted in the housing cover. By means of the second radial seal, which is arranged in addition to the first radial seal on the closure element, therefore, an additional sealing of the housing interior of the filter device can be achieved to the outside.

In order to further improve the sealing effect of the second radial seal, in a particularly preferred embodiment, the closure element may comprise a second annular seal element arranged on the outer peripheral surface of the closure element in a second annular groove, by means of which the second radial seal in which on the housing cover

attached state in the housing cover idling opening seals the housing interior of the housing to the outside. In a particularly easy to produce and therefore cost-effective

Embodiment, the filter element may comprise an annular filter body, which is closed at its two axial ends by means of a first and a second end plate. The first end disk includes the

Filter element idling opening, which is arranged concentrically in the first end plate, so that the first end plate is annular.

To by means of the first radial seal of the invention

Closure element to achieve a particularly good sealing effect, the first end plate of the filter element having an opening collar with a collar inner surface, in which the closure element in the on the

Housing cover attached state axially engages the formation of the first radial seal. In the event that the closure element is the first

Having sealing element, this can therefore be pressed by means of the axial engagement of the closure element against the collar inner surface to seal the raw side against the clean side.

In a further embodiment, the opening collar as

Be formed sealing lip. In this way, the sealing effect of

Closure element can be further improved.

In an alternative, likewise further embodiment, an annular non-woven element can be attached, in particular welded, to the end disk, on which the outer peripheral surface of the

Closing element can be applied in the mounted on the housing cover state to form the first radial seal.

In order to attach the closure element in a simple manner to the housing cover and to be able to remove it again if necessary, may be thought in a further embodiment, the

Closing element as a screw plug with an external thread

form, which can be screwed to close the two idle openings in a provided on the housing cover and to the external thread complementary internal thread.

To produce a cost-effective closure element, which nevertheless provides both the first radial seal and the second radial seal and a simple closure mechanism for releasably securing the closure element to the housing element, in a particularly preferred embodiment, a first outer surface of

Closing element axially adjacent to each other have a first and a second radial step, by means of which the outer peripheral surface is divided into a first, second and third outer peripheral surface portion. In this case, the first radial seal is associated with the first outer peripheral surface portion; Accordingly, the second radial seal is disposed in the second outer peripheral surface portion. The external thread of the closure element is then arranged in the third outer peripheral surface portion.

In an embodiment that is particularly easy to implement in terms of technology, the housing cover idling opening and the filter element idling opening may each be circular and have first or second idling orifice diameters, wherein the first idling orifice diameter is greater than the second idling orifice diameter.

In a likewise simple and therefore inexpensive to produce

Embodiment, the housing cover idle opening and the

Filter element Leerlaufoffnung be mounted in the mounted on the housing cover state of the filter element concentric with each other. Particularly preferably, a bypass channel can be provided in the closure element, which in a mounted on the housing cover state of

Closing element fluidly connects the raw side with the clean side. in the

By-pass channel is provided a valve element which between a closed position in which it closes the bypass channel fluid-tight, and an open position in which it the bypass channel to

Flowing through with a fluid releases, is adjustable. By means of such, provided with a valve element bypass channel, an overpressure function can be realized in the filter device, in such a way that at

Exceeding a maximum allowable fluid or oil pressure in the raw side of the filter device opens the valve element, that is adjusted in the open position. In this position, the bypass channel is released, so that the fluid or oil can flow directly to the clean side of the filter device. Thus, the fluid pressure in the raw side of the filter device can be reduced until it is again below a critical threshold pressure. By means of the closure element with integrated bypass channel, in which a valve element is provided, so can a fluid or oil pressure related damage or even

Destruction of the filter device and its components, in particular of the filter element installed in the filter housing, largely or even completely prevent.

In a preferred embodiment, a closure element main body of the closure element may be formed as a hollow body, in which the

Bypass channel is provided. The valve element is displaceable for adjusting between the open and the closed position along an axial direction of the hollow body in this. This allows a technically simple and at the same time space-saving implementation of the bypass channel inside the closure element. In addition, by means of the design of the closure element in the manner of a hollow body, the weight of the

Keep closure element low.

According to an advantageous development, a first passage opening can now be provided in the hollow body, which fluidly connects the bypass channel to the clean side in the state of the closure element attached to the housing cover. Correspondingly, a further, second passage opening is provided in the hollow body, which fluid side connects fluidically with the bypass channel. By providing two such

Through openings in the hollow body can be realized in a simple manner required for the realization of a pressure relief valve fluid connection of the raw side with the clean side over the bypass channel of the closure element.

Particularly expedient, the hollow body may be formed as a hollow cylinder, wherein the first passage opening at a first axial end of the

Hollow cylinder is provided. In this case, the hollow cylinder has a cylinder wall, in which the second passage opening is provided. That the

Hollow cylinder flowing fluid can thus thus first flow in the direction radially inward into the bypass channel, this flow along the axial direction and leave in the axial direction back into the clean side of the filter device. It is clear in this context that in variants other, deviating from a hollow cylinder geometries are conceivable, which may have the hollow body. For example, it may be thought that the hollow cylinder tapers conically along the axial direction. It can also be provided that the hollow cylinder has one or more radial steps along the axial direction. In a preferred embodiment, the filter element may have an annular filter body, which is closed at its two axial ends by means of a first and a second end plate, wherein the first

Endplate has a concentrically arranged in this filter element idling opening, so that the first end plate is annular. At the first end plate a projecting from this Filterelement- fastener is provided, which engages in a state attached to the housing cover in a provided on the housing cover complementary and inwardly projecting housing cover fixing element. This allows easy disassembly of the filter element, for example, for maintenance purposes or the like.

Preferably, the housing cover enclosing the housing cover idling opening and projecting inwardly

Have Leerlauföffnungskragen. The first end disk can correspondingly have an opening collar with a collar inner surface, in which the closure element engages in the mounted on the housing cover state in the region between the first and second passage opening axially to form the first radial seal. The second passage opening provided in the cylinder wall is arranged in the state of the closure element fastened to the housing cover in the axial direction between the opening collar and the idle opening collar. In this way, the area between the opening collar and the idle opening collar can be used for a fluid connection between the raw side and the bypass channel, which reduces the space required for the realization of the closure element. The second passage opening provided on the cylinder wall may include one or more separate sub-passage openings provided in the manner of windows in the cylinder wall. For the purpose of particularly simple technical realization of the first radial seal this can be on an outer peripheral surface of the

Closing element arranged in a first annular groove first annular sealing element, by means of which the first radial seal in the mounted on the housing cover state of the closure element in the filter element idling opening seals the raw side against the clean side. This allows a particularly simple and thus cost-effective production of the filter device according to the invention. Alternatively, in an equally preferred embodiment, the opening collar of the filter element may be formed as a sealing lip, which makes the provision of an annular groove and a sealing element in the manner of a sealing ring on the closure element itself superfluous. According to another alternative may be at the first

Endscheibe also a ring-shaped nonwoven member attached, in particular welded, be, on which the outer peripheral surface of the

Closing element in the mounted on the housing cover state to form the first radial seal is present.

In order now to close the hollow cylinder of the closure element main body in the closed position of the valve element in a simple manner, the valve element may be formed according to a particularly preferred embodiment stamp-like with an extending along an axial direction valve element base body. The valve element base body itself is then formed in the manner of a piston. In such a piston or stamp-like design, the valve element base body along the axial direction in a radially outwardly projecting first axial

Transition end portion, which the first passage opening in

closed closed state of the valve element fluid-tight. This means that the first axial end portion acts in the manner of an adjustable cover and thus seals the bypass channel against the clean side of the filter device. By displacing the valve element along the axial direction, the first axial end section is displaced beyond the first passage opening in the direction of the clean side of the filter element, ie axially away from the idling opening, so that the first passage opening is at least partially released. The valve element is then in the open position.

In order to implement or realize a safety function in the manner of a pressure relief valve by means of the valve element, a spring element can be provided in the hollow body, which biases the valve element toward the closed position. The generated by the bias of the spring element

Biasing force can be determined by suitable design of the spring element, in particular with regard to the spring constant, such that for moving the valve element in the open position accumulated in the raw side of the filter means a predetermined oil

Threshold must exceed. In this case, the biasing force generated by the spring member is released, so that the valve element moves toward the open position. In the case that in the raw side of the

Filter device, the predetermined threshold is not exceeded, the valve element, however, remains in the closed position.

For the purpose of a particularly simple technical realization of

Bias of the valve element by means of the spring element may be provided in the hollow body, an axial stop on which the spring element for biasing the valve element is supported at one end.

For a particularly simple attachment of the valve element in the hollow body of the valve element base body can pass against the axial direction in a second axial end portion, in the region of a locking element is provided. This locking element forms with a provided in the hollow body Support ring a latching device for releasably fixing the

Valve element on the spring element. The spring element can thus at one end on the axial stop and the other end for biasing the

Valve element supported on the support ring, wherein the support ring is movable in the hollow body along the axial direction.

The present invention further relates to a filter element for a

Filter device with one or more of the aforementioned

Characteristics.

In a preferred embodiment, the filter element may have an annular filter body, which is closed at its two axial ends by means of a first and a second end plate, wherein the first

Endplate has a concentrically arranged in this filter element idling opening, so that the first end plate is annular. The filter element may further comprise a fastening element for fastening the filter element to the housing cover of a filter device having one or more of the above-mentioned features. This allows easy replacement of the filter element, for example, for maintenance purposes or the like.

Preferably, the filter element idling opening may be bordered by an opening collar projecting inwards in the direction of the second end disk or outwardly away from the second end disk with a collar inner surface which is suitable for radial contacting with an annular

Sealing element is suitable. In this way, an improved sealing effect can be achieved. To achieve a particularly high sealing effect of the opening collar may be formed in a preferred embodiment as a sealing lip.

Alternatively, in a particularly simple and therefore inexpensive to produce embodiment of an annular non-woven element attached to the end plate, in particular welded, be, which is suitable for radial contacting with an annular sealing element.

The invention further relates to a motor vehicle with a filter device having one or more of the aforementioned features.

Other important features and advantages of the invention will become apparent from the dependent claims, from the drawings and from the associated

Description of the figures with reference to the drawings.

It is understood that the features mentioned above and those yet to be explained below can be used not only in the particular combination given, but also in other combinations or in isolation, without departing from the scope of the present invention.

Preferred embodiments of the invention are illustrated in the drawings and will be explained in more detail in the following description.

In each case show schematically:

1 shows an embodiment of a filter device according to the invention,

2 is a partial view of Figure 2, 3 shows a first variant of the embodiment of Figure 1,

4 shows a second variant of the embodiment of Figure 2,

Fig. 5 shows a variant of the embodiment of Figure 1 with a in the

Closure element integrated pressure relief valve,

6 shows a first variant of the embodiment of Figure 5,

7 shows a second variant of the embodiment of FIG. 5.

1 shows a filter device 1 according to the invention in a partial longitudinal section view and designated 1. The filter device 1 has a filter housing, which is shown only partially in FIG. 1 and designated by 2. On the filter housing 2, a housing cover 3, which has a housing cover idling opening 4, attached. Connected to the housing cover 3 is a filter element 5, which has a filter element idling opening 6 and, in the state shown in FIG. 1 (mounted in the filter housing 2), separates a raw side 7 from a clean side 8.

On the housing cover 3, a closure element 9 is mounted, which closes both the housing cover idle opening 4 and the filter element idle opening 6. The closure element is shown in more detail in FIG. The closure element 9 can be formed as shown in FIGS. 1 and 2 as a screw plug with an external thread 10, which for closing the two idle openings 4, 6 in a on the

Housing cover 3 provided and complementary to the external thread 10 internal thread 1 1 is screwed. The Verschlusselennent 9 closes both the housing cover idle opening 4 and the filter element idle opening 6. To close the

Filter element idle opening 6, the closure element 9 has a first radial seal 12, by means of which the closure element 9, the raw side 7 seals against the clean side 8. A particularly good sealing effect of the first radial seal 12 is achieved by means of a first annular sealing element 13, which is arranged on an outer peripheral surface 14 in a first annular groove 15. This first annular sealing element 13 seals in the mounted on the housing cover 3 state of the closure element 9 in the filter idle opening 6, the raw side against the clean side.

Furthermore, the closure element 9 has a second radial seal 16, by means of which the closure element 9 additionally seals a housing interior, which may comprise both the raw side 7 and the clean side 8 of the filter device 1, to the outside.

To improve the sealing effect of the second radial seal 16, the closure element 9 in a manner analogous to the first radial seal 12 on the outer peripheral surface 14, a second annular groove 17, in which a second annular sealing member 18 is arranged, wherein by means of the second radial seal 16 of the Housing interior of the filter housing 2 is particularly well sealed to the outside.

The filter device 1 can have both an inlet opening for introducing unfiltered oil and an outlet opening for discharging an oil filtered by the filter device 1. These can preferably be in an axially opposite the closure element 9 region of

Filter device 1 may be arranged and are therefore not shown in the illustration of FIG. 1. Such an inlet opening can with the raw side 7 of the Filter device 1 are in fluid communication, so that the filter device 1 supplied unfiltered oil flows radially through the filter element 5 and then as filtered oil by the clean side 8 of the filter device 1 in

Fluid connection standing outlet opening the filter device 1 can leave again.

In a variant, it is of course also conceivable that the raw side 7 of the filter device 1 is not arranged radially outside the clean side 8 as shown in FIGS. 1 and 2, but vice versa. According to this variant, the unfiltered oil would then flow through the filter element 5 radially outward.

Looking more closely at the adjusting element 9 in the representation of FIG. 2, it can be seen that the outer peripheral surface 14 of the closure element 9 axially adjacent to each other has a first and a second radial step 19, 20, by means of which the outer peripheral surface 14 in a first, second and third

Outside peripheral surface portion is divided. Then, the first radial seal 12 is disposed in the first outer peripheral surface portion and the second radial seal 16 is disposed in the second outer peripheral surface portion. Accordingly, the external thread 10 of the closure element 9 in the third

Outside peripheral surface portion arranged.

Here, a radial diameter of the first outer peripheral surface portion is smaller than a radial diameter of the second peripheral surface portion, and the radial diameter of the second outer peripheral surface portion is smaller than a radial diameter of the third outer peripheral surface portion.

Accordingly, a first idle opening diameter Di is that in the

Embodiment of Fig. 1 circular housing cover idle opening 4 larger than a second idle opening diameter D ₂ of likewise in the form of a circular filter element idling opening 6. In the condition of the filter element 5 mounted on the housing cover 3, the housing cover idling opening 4 and the filter element idling opening 6 are arranged concentrically with one another.

To now during a filtering operation in a region 21 of the raw side 7 accumulated dirt oil and in the area 22 of the clean side accumulated filtered oil for cleaning or maintenance purposes at the same time

To be able to remove the filter device 1, the closure element 9 designed as a closure screw is screwed out of the housing cover 3, so that both the first and second radial seal 12, 16 from the

Filter device 1 is removed. Then both the raw side 7 and the clean side 8 is in fluid communication with an external environment of the filter device 1, so that in the regions 21 and 22 accumulated unfiltered or filtered oil from the filter device 1 can be drained.

As soon as such a cleaning and maintenance operation of the filter device 1 is completed, the closure element 9 can be easily attached by screwing the screw plug into the housing cover 3 on this, so that the first and second radial seal 12, 16 again the desired

Can develop sealing effect.

2, it can be seen that this has an annular filter body 23, which at its two axial ends by means of a first end plate 24 and a second end plate (not shown in the partial view of FIG. 2). is closed. The filter element idle opening 6 is in the first end plate 24th

arranged concentrically to this, so that the first end plate 24 is annular. The filter element 5 further comprises a fastening element 25 in the manner of a clip closure, by means of which the filter element 5 on the

Housing cover 3 of the filter device 1 is releasably secured. For this purpose, for the formation of the clip-closure and the housing cover 3 a to the

Fastener 25 complementary fastener on. The

Filter element idle opening 6 of the filter element 5 is formed by an opening collar projecting inwards in the direction of the second end disk (not shown)

26, wherein the opening collar 26 has a collar inner surface which is radially in contact with the first annular seal member 13 for forming the first radial seal 12.

In a simplified variant of the invention shown in FIGS. 3a and 3b

Closure element 9 may be dispensed with the first annular sealing element. In this case, the first radial seal 12 for sealing the raw side 7 against the clean side 8 on a circular cylindrical radial sealing contour. To improve the sealing effect of the opening collar 26 as a sealing lip

27, which, as shown in FIG. 3 a, protrudes inwards in the direction of the second end disk from the first end disk 24. In an alternative variant, shown in FIG. 3b, the sealing lip 27 can also protrude away from the first end disk 24 in the opposite direction, ie away from the second end disk. On the closure element 9 can in the region of the first radial seal 12 for receiving the sealing lip

complementary receiving groove 29 may be provided.

In an alternative variant, which is shown in FIG

Filter element 5 instead of an opening collar, an annular fleece element 28 which, at the first end plate 24 of the filter element fifth

can be welded. When screwing the closure element 9 in the Housing cover idling opening 4, the nonwoven member 28 is pressed inwardly into the filter element idle opening 6 (and thereby deformed, not shown in Figure 4), so that in this way the raw side 7 can be sealed against the clean side 8.

FIG. 5 shows a further variant of the filter element 1 of FIG. 1

illustrated, in which the closure element 9 is provided with a valve element 32 having a bypass channel 31 which connects the raw side 7 with the clean side 8 of the filter device 1 when the closure element 9 is mounted on the housing cover 3.

The closure element 9 has a closure element main body 30 and can in a manner analogous to the examples of Figures 1 to 4 as

Screw plug with an external thread 10 may be formed, which is screwed for closing the two idle openings 4, 6 in a provided on the housing cover 3 and the external thread 10 complementary internal thread 1 1.

The closure element main body 30 of the closure element 9 may, as shown in FIG. 5, be designed as a hollow body 36 in which the bypass channel 31 is provided. The bypass channel 31 connects in an am

Housing cover 3 mounted state of the closure element 9, the raw side 7 of the filter device 1 fluidly with the clean side 8. In the bypass channel 31, a valve element 32 is provided, which is adjustable between a closed and an open position. In the one shown in FIG

In the closed position, the valve element 32 closes the bypass channel 31 in a fluid-tight manner, whereas it releases the bypass channel 31 in the open position for flowing through with a fluid. Such a fluid may preferably be Be oil when the filter device 1 is used as an oil filter in a motor vehicle.

The valve element 32 is displaceable for adjusting between the open and the closed position along an axial direction A of the hollow body 36. In the hollow body 36, a first through-opening 38 is provided which, in the state of the closure element 9 shown on the housing cover 3 shown in FIG. 5, fluidly connects the bypass channel 31 with the clean side 8. The hollow body 36 may be formed as shown in FIG. 5 as a hollow cylinder 33. In this case, the first passage opening 38 is provided at a first axial end of the hollow cylinder 33, which faces the filter element 5 in the mounted state of the closure screw 9. The hollow cylinder 33 shown in FIG. 5 comprises a cylinder wall 34, in which a second passage opening 37 is provided. This second passage opening 37 fluidly connects the raw side 7 with the bypass passage 31. In variants, of course, a plurality of such passage openings 37, for example in the manner of passage windows, may be provided in the cylinder wall 34. In a further variant, the cylinder wall 34 can also taper conically.

In the state shown in FIG. 5, the valve element 32 is in the closed position, in which the fluid connection between the raw side 7 and the clean side 8 established by means of the bypass channel 31 is interrupted. For clarity, the flow path of the bypass channel 31

flowing fluid or oil by means of two designated by the reference numeral F arrows. The valve element 32 shown in FIG. 5 is stamp-like with one extending along the axial direction A.

Valve element base body 40 is formed, which along the axial direction A in a radially outwardly projecting first axial end portion 41st passes. By means of the first axial end portion 41 of the valve element 32, which acts in the manner of a lid, the first passage opening 38 is closed in the closed state of the valve element 32 shown in FIG. 5 in a fluid-tight manner. To open the bypass channel 31, the valve element 32 is moved along the axial direction A away from the housing cover idling opening 4 to the filter element 5, so that the first axial end portion 41, the first passage opening 38 releases.

Thus now the valve element 32 may act in the manner of a pressure relief valve, which by means of the bypass channel 31, the fluid connection between the

Raw side 7 and the clean side 8 manufactures when the fluid pressure occurring in the raw side 7 exceeds a predetermined value, a spring element 39 may be provided in the hollow body 36, which the valve member 32 for

biased closed position. For generating such

Preload can be provided in the hollow body 36, an axial stop 42 on which the spring element 39 is supported for biasing the valve member 32 at one end. The axial stop 42 may take the form of an in

Circumferential direction of the cylinder wall 34 extending radially inward

projecting projection to be formed; Of course, in variants but also other implementation options are conceivable. In order to move the biased by the spring member 39 toward the closed position valve element 32 in the open position, the fluid pressure in the raw side 7 of the filter device 1 must exceed a predetermined threshold pressure, so that an acting on the valve element 32 counterforce is generated, which the Spring element 39 canceled biasing force generated.

The valve element base body 40 can, as shown in FIG. 5, proceed opposite to the axial direction A into a second axial end section 43, in the region of which a latching element 44 is provided, which is provided with a locking element 44 Hollow body 36 provided support ring 48 a latching device for releasably attaching the valve member 32 on the spring element 39 is formed. For mounting in the bypass channel 31, the locking element 44 can be clipped into the support ring 48. The support ring 48 is then arranged together with the valve element 32 along the axial direction A movable in the bypass channel 31. The spring element 39 thus supports one end on the axial

Stop 42 and the other end on the support ring 48 from. For sealing the bypass channel 31 outwards against the environment, this can be closed by means of a cylinder-like bypass passage closure element 45.

The housing cover 3 may have a housing cover idle opening 4 enclosing and projecting inwardly idle opening collar 46. The end disk 24 of the filter element 5 can accordingly have an opening collar 26 with a collar inner surface, in which the closure element 9, in particular its hollow body 36, in the region between the first and second through-holes 38, 37 engages axially to form the first radial seal 12. In other words, provided in the cylinder wall 34 second passage opening 37 is disposed in the state attached to the housing 3 of the closure member 9 in the axial direction A between the opening collar 26 and the idle opening collar 46.

Can develop sealing effect. If one now considers the filter element 5 according to FIG. 5, it can be seen that this has an annular filter body 23 which is closed at its two axial ends by means of a first end disk 24 and a second end disk (not shown in the partial view of FIG. 5) is. The filter element idle opening 6 is arranged in the first end plate 24 concentric with this, so that the first end plate 24 is annular.

The filter element 5 furthermore has a filter element fastening element 25 in the manner of a clip closure, by means of which the filter element 5 can be detachably fastened to the housing cover 3 of the filter device 1. For this purpose, the housing cover 3 for forming the clip closure on a complementary to the filter element fixing element 25 housing cover fastening element 47. The filter element idle opening 6 of

Filter element 5 is surrounded by the collar 26 projecting inwards in the direction of the second end disk (not shown), wherein the opening collar 26 has a collar inner surface which radially with the first annular sealing member 13 for forming the first

Radial seal 12 may be in contact.

In a simplified variant of the closure element 9 according to FIG. 5, shown in FIG. 6, the first annular sealing element can be dispensed with. In this case, the first radial seal 12 for sealing the raw side 7 against the clean side 8 have a circular cylindrical radial sealing contour. To improve the sealing effect of the opening collar 26 is formed as a sealing lip 27 which, as shown in Figure 3a, projects inwardly in the direction of the second end plate of the first end plate 24 and abuts the hollow body 36. In a further variant of the closure element of FIG. 5, which is shown in FIG. 7, instead of an opening collar, the filter element 5 can have an annular fleece element 28 which can be welded to the first end plate 24 of the filter element 5. When screwing in the

Closure element 9 in the housing cover idling opening 4, the nonwoven member 28 is pressed inwardly into the filter element idle opening 6 (and thereby deformed, not shown in the figure 7), so that in this way

Raw side 7 can be sealed against the clean side 8.

*****

Claims

claims

1 . Filter device (1), in particular for a motor vehicle,

with a filter housing (2),

with a housing cover (3) which is fastened to the filter housing (2) and has a housing cover idling opening (4),

with a filter element (5) which can be connected or connected to the housing cover (3) and which has a filter element idling opening (6) and in a state mounted in the filter housing (2) in the filter housing

(2) separates a raw side (7) from a clean side (8),

with a closure element (9) which can be attached or attached to the housing cover (3) and closes both the housing cover idling opening (4) and the filter element idling opening (6) in a state attached to the housing cover (3),

wherein the closure element (9) has a first radial seal (12), by means of which the closure element (9) in which on the housing cover

(3) attached state in the filter element idle opening (6) the raw side (7) against the clean side (8) seals.

2. Filter device (1) according to claim 1,

characterized in that

the first radial seal (12) of the closure element (9) has a first annular seal element (13) arranged on an outer peripheral surface (14) of the closure element (9) in a first annular groove (15), by means of which the first radial seal (12 ) in the at the Housing cover (3) attached state of the Verschlusselennents (9) in the filter element idle opening (6), the raw side (7) against the clean side (8) seals.

3. Filter device according to claim 1,

characterized in that

the first radial seal (12) has a circular-cylindrical radial sealing contour, by means of which the first radial seal (12) in the state of the closure element (9) in the filter element idling opening (6) attached to the housing cover (3) 7) seals against the clean side (8).

4. Filter device (1) according to one of claims 1 to 3,

characterized in that

the closure element (9) has a second radial seal (16), by means of which the closure element (9) seals a housing interior to the outside in the state in the housing cover idling opening (4) attached to the housing cover (3).

5. Filter device (1) according to claim 4,

characterized in that

the closure element (9) has a second annular sealing element (18) arranged on the outer circumferential surface (14) of the closure element (9) in a second annular groove (17), by means of which the second radial seal (16) in the housing cover (3 ) mounted state in the housing cover idle opening (4) seals the housing interior to the outside.

6. Filter device (1) according to one of the preceding claims, characterized in that

the filter element (5) comprises an annular filter body (23) which is closed at its two axial ends by means of a first (24) and a second end disk,

the first end disk (24) comprises the filter element idling opening (6), which is arranged concentrically in the first end disk (24), so that the first end disk (24) is annular.

7. Filter device (1) according to claim 6,

characterized in that

the first end plate (24) has an opening collar (26) with a collar inner surface, in which the closure element (9) engages axially in the state attached to the housing cover (3) to form the first radial seal (12).

8. Filter device (1) according to claim 7,

characterized in that

the opening collar (26) is designed as a sealing lip (27).

9. Filter device (1) according to claim 6,

characterized in that

on the end plate (24) an annular non-woven element (28) attached, in particular welded, is, on which the outer peripheral surface (14) of the closure element (9) in which on the housing cover (3)

attached condition for forming the first radial seal (12) is applied.

10. Filter device (1) according to one of the preceding claims,

characterized in that the closure element (9) as a screw plug with a

External thread (10) is formed, which for closing the two idle openings (4, 6) in a on the housing cover (3) provided and to the external thread (10) complementary internal thread (1 1) can be screwed.

1 1. Filter device (1) according to claim 10,

characterized in that

the outer peripheral surface (14) of the closure element has axially adjacent to each other a first and a second radial step (19, 20), by means of which the outer circumferential surface is divided into first, second and third

Outer peripheral surface portion is divided,

- wherein the first radial seal (12) in the first

Outer peripheral surface portion is arranged,

- Wherein the second radial seal (16) in the second

Outer peripheral surface portion is arranged,

- Wherein the external thread (10) of the closure element (9) is arranged in the third outer peripheral surface portion.

12. Filter device (1) according to one of the preceding claims,

characterized in that

the housing cover idling opening (4) and the filter element idling opening (6) are in each case circular and have a first or second idling opening diameter (Di, D ₂ ),

- The first idle opening diameter (Di) greater than the second

Idle opening diameter (D ₂ ) is.

13. Filter device (1) according to one of the preceding claims, characterized in that

in the attached to the housing cover (3) state of the

Filter element (5), the housing cover idle opening (4) and the

Filter element Leerlaufoffnung (6) are arranged concentrically with each other.

14. Filter device (1) according to one of the preceding claims,

characterized in that

a bypass channel (31) is provided in the closure element (9), which in a state attached to the housing cover (3)

Closing element (9) fluidly connects the raw side (7) with the clean side (8),

with a in the bypass passage (9) provided valve element (32) which between a closed position in which it closes the bypass passage (31) fluid-tight, and an open position in which it the bypass passage (31) for Flowing through with a fluid releases, is adjustable.

15. Filter device (1) according to claim 14,

characterized in that

the closure element (9) has a closure element main body (30) which is designed as a hollow body (36) and in which the bypass channel (31) is provided,

the valve element (32) is displaceable therein for adjustment between the open and closed positions along an axial direction (A) of the hollow body (36).

16. Filter device (1) according to claim 15,

characterized in that a first passage opening (38) is provided in the hollow body (36), which in the state attached to the housing cover (3)

Closing element (9) fluidly connects the bypass channel (31) with the clean side (8),

in the hollow body (36) a second passage opening (37) is provided, which in the on the housing cover (3) attached state of the

Closing element (9) fluidly connects the raw side (7) with the bypass channel (31).

17. Filter device (1) according to claim 16,

characterized in that

the hollow body (36) is designed as a hollow cylinder (33),

the first passage opening (38) at a first axial end of the

Hollow cylinder (33) is provided,

the hollow cylinder (33) comprises a cylinder wall (34), wherein the second passage opening (37) is provided in the cylinder wall (34).

18. Filter device (1) according to one of the preceding claims,

characterized in that

the first end disk (24) comprises the filter element idling opening (6), which is arranged concentrically in the first end disk (24), so that the first end disk (24) is annular,

on the first end plate (24) projecting from this filter element fastening element (25) is provided, which in an am

Housing cover (3) attached state in a on the housing cover (3) provided complementary and inwardly projecting

Housing cover fastener (47) engages.

19. Filter device (1) according to claim 18,

characterized in that

the housing cover (3) has an open-circuit opening collar (46) enclosing the housing cover idling opening (4) and projecting inwards,

the first end disk (24) has an opening collar (26) with a collar inner surface, in which the closure element (9) in the region between the first and second through-openings (38, 37) in the state attached to the housing cover (3) axially to the formation the first radial seal (12) engages,

the second passage opening (37) provided in the cylinder wall (34) is arranged in the state of the closure element (9) fastened to the housing cover (3) in the axial direction (A) between the opening collar (26) and the idle opening collar (46).

20. Filter device (1) according to one of claims 6 to 19,

characterized in that

the first radial seal (12) of the closure element (9) has a first annular seal element (13) arranged on an outer peripheral surface of the closure element (9) in a first annular groove (15), by means of which the first radial seal (12) in the to the

Housing cover (3) attached state of the closure element (9) in the filter element idle opening (6), the raw side (7) against the clean side (8) seals, or that

the opening collar (26) is formed as a sealing lip (27), or that at the first end plate (24), an annular nonwoven member (28) mounted, in particular welded, is at which the

Outer peripheral surface of the closure element (9) in which on the

Housing cover (3) attached state for forming the first radial seal (12) is applied.

21. Filter device (1) according to one of claims 14 to 20,

characterized in that

the valve element (32) is stamp-shaped with a valve element base body (40) extending along an axial direction (A), the valve element base body (40) along the axial direction (A) into a radially outwardly projecting first axial end section (Fig. 41), which closes the first passage opening (38) in the closed state of the valve element (32) in a fluid-tight manner.

22. Filter device (1) according to one of claims 15 to 21,

characterized in that

in the hollow body (36) a spring element (39) is provided, which biases the valve element (32) towards the closed position.

23. Filter device (1) according to claim 22,

characterized in that

in the hollow body (36) an axial stop (42) is provided, on which the spring element (39) for biasing the valve element (32) is supported at one end.

24. Filter device (1) according to one of claims 21 to 23,

characterized in that the valve element base body (40), opposite to the axial direction (A), merges into a second axial end section (43), in the region of which a latching element (44) is provided, which with a support ring (48) provided in the hollow body (33) has a latching device for the releasable fixing of the valve element (32) on the spring element (39) is formed, the spring element (39) at the other end for biasing the

Valve element (32) on the support ring (48) is supported.

25. Filter element (5) for a filter device (1) according to one of

previous claims.

26. Filter element (5) according to claim 25,

with an annular filter body (23) which is closed at its two axial ends by means of a first (24) and a second end disk,

wherein the first end disk (24) has a filter element idling opening (6) arranged concentrically in the latter, so that the first end disk (24) is annular,

with a fastening element (25) for fastening the filter element (5) to the housing cover (3) of a filter device (1) according to one of claims 1 to 24.

27. Filter element according to claim 26,

characterized in that

the filter element idling opening (6) is bordered by an opening collar (26) projecting inwards in the direction of the second end disk or outwardly away from the second end disk and having a collar inner surface which is in radial contact with an annular surface

Sealing element (13) is suitable.

28. Filter element according to claim 27,

characterized in that

the opening collar (26) is designed as a sealing lip (27).

29. Filter element according to claim 27,

characterized in that

on the first end plate (24) an annular non-woven element (28) mounted, in particular welded, which is suitable for radial contact with an annular sealing element (13).

30. Motor vehicle with a filter device (1) according to one of claims 1 to 24.

*****