Filter device and filter insert
Patent Information
- Authority / Receiving Office
- WO · WO
- Patent Type
- Applications
- Current Assignee / Owner
- DAIMLER TRUCK AG
- Filing Date
- 2025-12-16
- Publication Date
- 2026-07-30
Smart Images
Figure EP2025087259_30072026_PF_FP_ABST
Abstract
Description
[0001] Daimler Truck AG Dr. Britta Riege 12.12.2025
[0002] Filter device and filter insert
[0003] The invention relates to a filter device for filtering an operating medium for a motor vehicle and a filter insert for such a filter device.
[0004] With such filter devices, a common problem is preventing the unwanted discharge of unfiltered operating fluid when the filter element is changed. To solve this problem, a support dome can be arranged in the filter housing of the filter device. This dome has inlet openings above an edge of the filter housing, preventing residual operating fluid present in the filter housing from entering the inlet openings when the filter element is changed. However, with such a design, the filter element must be pulled very far out of the filter housing to clear the support dome, which is often difficult or even impossible due to space constraints. Furthermore, the long, thin, and protruding support dome is inherently unstable and can be damaged or break off during the filter element change.
[0005] The invention is therefore based on the objective of creating a filter device for filtering an operating medium for a motor vehicle and a filter insert for such a filter device, wherein the aforementioned disadvantages are at least reduced, preferably avoided.
[0006] The problem is solved by providing the present technical teaching, in particular the teaching of the independent claims as well as the preferred embodiments disclosed in the dependent claims and the description.
[0007] The problem is solved in a first aspect, in particular, by creating a filter device for filtering a consumable for a motor vehicle, which has a filter housing, wherein the filter housing has a filter chamber, a raw consumable inlet for supplying unfiltered consumable to the filter chamber and a clean consumable outlet for removing filtered consumable from the filter chamber, wherein a support dome is arranged in the filter chamber, which is tightly connected to the clean consumable outlet and has an inlet opening opening into the filter chamber, an internal flow channel and an outlet opening opening into the clean consumable outlet, wherein the filter chamberDaimler Truck AG 2 Dr. Britta Riege 12.12.2025 is designed to accommodate a filter insert having a service filter such that a flow-technical filter connection is formed between the raw service inlet and the inlet opening via the service filter, wherein the filter insert separates the raw service inlet from the inlet opening outside the flow-technical filter connection when the filter insert is arranged as intended - in a mounting position - in the filter chamber, wherein the support dome has a closing element which is displaceable between a locking position in which the inlet opening is closed by the closing element and a release position in which the inlet opening is released, wherein the closing element is rotatably mounted about a longitudinal axis of the support dome between the locking position and the release position, and wherein the closing element is biased into the locking position.Since the inlet opening can be closed by the sealing element when changing the filter element, the support dome does not need to be long to prevent unfiltered operating fluid from entering the clean operating fluid drain. In particular, the support dome does not need to protrude beyond the edge of the filter housing. Therefore, filter changes can be carried out easily even in confined spaces, and the support dome can be designed to be robust.Furthermore, by allowing the locking element to rotate between the locking position and the release position, a simple yet extremely reliable and robust kinematic mechanism is provided, which in particular ensures that, firstly, the inlet opening is securely closed – especially due to the preload – when the filter element is not in the filter housing, and secondly, that the inlet opening is securely open when the filter element is in the filter housing as intended.
[0008] The fact that the support dome is tightly connected to the clean operating fluid outlet means, in the context of the present technical teaching, in particular that operating fluids can only flow from the raw operating fluid inlet to the clean operating fluid outlet via the support dome; that is, a fluid-technical connection between the raw operating fluid inlet and the clean operating fluid outlet is only given via the support dome, namely via the inlet opening, the flow channel and the outlet opening.
[0009] In one embodiment, the support dome is arranged coaxially to the clean operating medium drain.
[0010] The inlet opening is fluidically connected to the outlet opening via the flow channel; in particular, the inlet opening leads into the flow channel, while the outlet opening leads out of the flow channel. Daimler Truck AG 3 Dr. Britta Riege 12.12.2025 In one embodiment, the support dome with an outlet section having the outlet opening projects into the clean operating fluid drain, and it is arranged with an inlet section having the inlet opening in the filter chamber.
[0011] In one embodiment, the support dome has exactly one inlet opening. In another embodiment, the support dome has a plurality of inlet openings. Alternatively or additionally, the support dome can have exactly one, in particular centrally located, coaxial outlet opening; however, the support dome can also have a plurality of outlet openings.
[0012] The inlet opening is preferably a radial opening in the support dome, meaning it opens in a direction perpendicular to a longitudinal axis of the support dome. Alternatively or additionally, the outlet opening is an axial opening that opens in the direction of the longitudinal axis.
[0013] In general, within the context of this technical teaching, a radial direction is understood to be a direction perpendicular to the longitudinal axis of the support dome. Similarly, an axial direction is understood to be a direction pointing in the direction of the longitudinal axis of the support dome. A circumferential direction is understood to be a direction that concentrically encompasses this longitudinal axis.
[0014] In the context of the present technical teaching, the fact that the inlet opening is closed by the closure part means in particular that the inlet opening is covered by the closure part, so that the flow-related connection between the raw material inlet and the clean material outlet via the inlet opening is interrupted when the closure part is in the closed position.
[0015] In the context of this technical teaching, the fact that the locking element is movable between the locked and unlocked positions means, in particular, that the locking element can be moved from the locked position to the unlocked position and back. This movement can be continuous or via at least one discrete intermediate state; however, it is also possible that the locking element has only the locked and unlocked positions as discrete functional positions, between which it can be switched digitally.
[0016] The filter device preferably also includes a filter housing cover, which is designed to be connected to the filter housing in order to close the filter housing. To change the filter element, the filter housing cover can be opened or removed, and then closed again after the filter element has been changed. The filter chamber preferably also includes the volume that is enclosed or limited by the filter housing cover when closed.
[0017] Alternatively or additionally, the filter device preferably has a raw operating fluid drain which is closed by the filter element in its mounting position, i.e., in the position in which the filter element is intended to filter the operating fluid in the filter chamber. The raw operating fluid drain is designed on or arranged in the filter housing such that, in particular, unfiltered operating fluid can flow out of the filter chamber through the raw operating fluid drain during filter changes, especially towards an operating fluid reservoir, for example, an oil pan.
[0018] According to a further development of the invention, the filter device comprises the filter insert, wherein the filter insert has a service filter and is arranged to be positioned in the filter chamber such that the flow-related filter connection is formed via the service filter, wherein the filter insert separates the raw service inlet from the inlet opening outside the flow-related filter connection when the filter insert is arranged as intended – in the mounting position – in the filter chamber, wherein the filter insert has at least one actuating element which is arranged to interact with the closing part in order to move the closing part between the locking position and the release position.Advantageously, the locking element can thus be moved in a simple and safe manner directly through the filter insert, namely through the at least one actuating element, when changing the filter insert.
[0019] Preferably, the filter element has a support cage that supports and carries the filter medium. In particular, the support cage is arranged inside the filter medium.
[0020] In particular, the actuating element is designed to interact with the locking element to move the locking element from the locked position to the released position. Alternatively or additionally, the locking element returns automatically from the released position to the locked position due to the preload.
[0021] In one embodiment, the filter element is arranged in the filter chamber of the filter housing, particularly in the mounting position. Daimler Truck AG 5 Dr. Britta Riege 12.12.2025
[0022] In one embodiment, the filter insert has exactly one actuating element. In another embodiment, the filter insert has multiple actuating elements.
[0023] In one embodiment, the actuating element is arranged to cooperate with a counter-actuating element arranged on the locking part in order to move the locking part between the locking position and the release position - in particular from the locking position to the release position.
[0024] In one embodiment, the closure element has exactly one counter-actuating element. Alternatively, the closure element has multiple counter-actuating elements. It is possible that the closure element has exactly as many counter-actuating elements as the filter insert has actuating elements. However, it is also possible, in particular, that the number of actuating elements differs from the number of counter-actuating elements.
[0025] According to a further development of the invention, the actuating element is designed as an actuating projection. This represents a design of the actuating element that is both simple and reliable.
[0026] In one embodiment, the actuating element is designed as a radial actuating projection.
[0027] According to a further development of the invention, the support dome has a retaining element arranged and configured such that it aligns with the counter-actuating element in the release position, and the actuating element can interact with the retaining element in the release position to hold the closure part against the preload when the filter element is fully installed in the filter chamber. Advantageously, the closure part is held securely and stably in the release position in this way as long as the filter element is not moved from its installation position, for example, removed for a filter change.
[0028] In particular, the actuating element, in its mounting position, creates a mechanical connection between the counter-actuating element and the retaining element, releasing this mechanical connection again when the filter element is axially displaced from the mounting position. Daimler Truck AG 6 Dr. Britta Riege 12.12.2025
[0029] Preferably, when the filter element is axially displaced in the insertion direction, the actuating element engages—with the filter element correctly oriented circumferentially—in the counter-actuating element of the closure part, which is in the locked position due to the preload. The filter element can only be displaced further axially toward the mounting position once it has been rotated circumferentially—toward the release position—until the counter-actuating element aligns with the retaining element. This means that the closure part must first be rotated into the release position by turning the filter element before the filter element can be moved into the mounting position. During the rotation of the filter element, the closure part is carried along by the actuating element engaging the counter-actuating element.In the release position, the actuating element can then engage with the retaining element, allowing the filter element to be moved further axially to reach the installation position. In the installation position, the retaining element prevents the actuating element, and consequently the counter-actuating element and ultimately the locking element, from being rotated out of the release position. To remove the filter element, it must first be pulled axially out in the removal direction until the actuating element disengages from the retaining element. Pulling the filter element further axially disengages the actuating element from the counter-actuating element, and the locking element is returned to the locked position by the preload.
[0030] In one embodiment, the support dome has exactly one retaining element. In another embodiment, the support dome can have multiple retaining elements.
[0031] In particular, the support dome can have as many retaining elements as the closure part has counter-actuating elements and / or as the filter insert has actuating elements.
[0032] According to a further development of the invention, the retaining element is designed as a retaining groove. This represents a design of the retaining element that is both simple and functionally reliable.
[0033] In particular, the retaining element is designed as a radial retaining groove extending in the axial direction, meaning that the groove depth extends in the radial direction and the groove length extends in the axial direction. Daimler Truck AG 7 Dr. Britta Riege 12.12.2025 In one embodiment, the retaining groove can be designed as a recess or bead in a wall of the support dome and, in particular, can project radially into the flow channel or be concave.
[0034] In one embodiment, the counter-actuating element is designed as a counter-actuating groove which is aligned with the holding groove in the release position.
[0035] According to a further development of the invention, a spring is arranged on the support dome, which is mechanically connected to the locking element and configured to pre-tension the locking element into the locked position. This advantageously represents a design that is both simple and reliable for providing the pre-tension.
[0036] In one embodiment, the spring is a coil spring. The coil spring can be arranged, in particular, on an end face of the support dome. Advantageously, it can be attached centrally to the support dome and around its circumference to the locking element.
[0037] According to a further development of the invention, the support dome is provided with a stop for the locking element in the release position. Advantageously, this allows haptic feedback for the person changing the filter insert, so that the filter insert can be changed particularly easily and quickly.
[0038] Alternatively or additionally, the support dome has a stop for the actuating element in the release position.
[0039] Alternatively or additionally, the support dome has a locking stop for the locking part in the locked position.
[0040] According to a further development of the invention, the support dome has at least one inlet opening on one side of a dome circumferential wall – particularly in a dome opening area – while a diametrically opposite dome sealing area of the dome circumferential wall is closed. Advantageously, this allows for a particularly simple and reliable closing of the inlet opening by the sealing element.
[0041] In one embodiment, the closure element has at least one flow-through opening which, in the release position, is aligned with the at least one inlet opening and, in the locked position, does not overlap with the inlet opening but is closed, in particular, by a wall section of the support dome, especially by the dome locking area of the dome's circumferential wall. Preferably, the closure element has the at least one flow-through opening itself on one side in a closure element opening area of a closure element's circumferential wall, wherein a diametrically opposite closure element locking area of the closure element's circumferential wall is closed. In the locked position, the closure element locking area covers the at least one inlet opening, and the dome locking area closes the at least one flow-through opening.
[0042] In one embodiment, the closure element has a plurality of flow openings, in particular as many flow openings as the support dome has inlet openings. Preferably, in the release position, the flow openings are aligned with one of the inlet openings each.
[0043] In one embodiment, the support dome engages with the filter element when the filter element is arranged in the filter chamber. Optionally, the support dome extends into the filter element only over a first axial length that is shorter than a second axial length of the filter element. In particular, this allows the support dome to be short and, especially, not to project beyond an edge of the filter housing.
[0044] In one embodiment, the filter device is configured to filter lubricating oil as the operating fluid. This particularly realizes the advantages already explained. In particular, it efficiently prevents dirt particles from reaching the lubrication points of the vehicle, even during a filter element change.
[0045] The problem is also solved in a second aspect, in particular, by creating a filter insert designed for use with a filter device according to the invention or a filter device according to one or more of the embodiments described above, wherein the filter insert has at least one actuating element designed to interact with the locking element in order to move the locking element between the locked position and the release position – in particular from the locked position to the release position. The advantages associated with the filter insert are those already explained in connection with the filter device.
[0046] In one embodiment, the filter insert has exactly one actuating element. In another embodiment, the filter insert has a plurality of actuating elements. Daimler Truck AG 9 Dr. Britta Riege 12.12.2025 In one embodiment, the actuating element is configured to interact with the at least one counter-actuating element arranged on the locking part in order to move the locking part between the locked position and the release position – in particular from the locked position to the release position.
[0047] It is possible that the filter element has exactly as many actuating elements as the closure part has counter-actuating elements. However, it is also possible that the number of counter-actuating elements differs from the number of actuating elements.
[0048] According to a further development of the invention, the actuating element is formed on a support cage of the filter element. Preferably, the support cage supports and carries a service filter of the filter element. In particular, the support cage is arranged inside the service filter.
[0049] The invention also includes a motor vehicle with a filter device according to the invention or a filter device according to one or more of the embodiments described above. In connection with the motor vehicle, the advantages are particularly those already explained in connection with the filter device or the filter element.
[0050] The raw fluid inlet is preferably connected via a fluid pump to a fluid reservoir of the vehicle, for example, an oil pan. The clean fluid outlet is preferably connected via a fluid pump to lubrication points of the vehicle. Optionally, the raw fluid outlet is connected via a fluid pump to the fluid reservoir, for example, the oil pan.
[0051] In one embodiment, the filter device is an oil filter device of the motor vehicle for filtering lubricating oil. Accordingly, the filter element is preferably an oil filter.
[0052] In one embodiment, the motor vehicle is designed as a commercial vehicle, in particular as a truck or bus.
[0053] The invention will be explained in more detail below with reference to the drawing. The drawing shows:
[0054] Figure 1 shows an embodiment of a filter device without a filter element inserted; Daimler Truck AG 10 Dr. Britta Riege 12.12.2025 Figure 2 shows detailed representations of the embodiment according to Fig. 1 to explain the function of the filter device;
[0055] Figure 3 shows an embodiment of a filter insert for the filter device according to Fig. 1;
[0056] Figure 4 shows the first illustrations of the embodiment of the filter device according to Fig. 1 with the filter insert according to Fig. 3 to explain the operation of the filter device;
[0057] Figure 5 shows a second embodiment of the filter device according to Fig. 1 with the filter insert according to Fig. 3 to illustrate the operation of the filter device, and
[0058] Figure 6 shows a third embodiment of the filter device according to Fig. 1 with the filter insert according to Fig. 3 to explain the function of the filter device.
[0059] Fig. 1 shows an embodiment of a filter device 1 for use with a filter insert 3 (see Figure 3), without the filter insert 3.
[0060] The filter device 1 is preferably designed as an oil filter device of a motor vehicle (not shown) for filtering lubricating oil. Accordingly, the filter element 3, shown for the first time in Figure 3, is preferably an oil filter. Preferably, the motor vehicle is a commercial vehicle, in particular a truck or bus.
[0061] The filter device 1 has a filter housing 5, which includes a filter chamber 7, a raw operating medium inlet 9 for supplying unfiltered operating medium into the filter chamber 7, and a clean operating medium outlet 11 for removing filtered operating medium from the filter chamber 7. A support dome 13 is arranged in the filter chamber 7, which is tightly connected to the clean operating medium outlet 11 and has an internal flow channel 15 (see Figure 2b) as well as an inlet opening 17 (also shown in Figure 2b) leading into the filter chamber 7, which is hidden from view of Figure 1, and an outlet opening 19 (see also Figure 5) leading into the clean operating medium outlet 11.The filter chamber 7 is designed to accommodate the filter insert 3, which is shown for the first time in Figure 3 and has a service filter 21, such that a flow-related filter connection is formed between the raw service inlet 9 and the inlet opening 17 via the service filter 21, wherein the filter insert 3 separates the raw service inlet 9 from the inlet opening 17 outside the flow-related filter connection when the filter insert 3 is in a mounting position, i.e. in the position in which the filter insert 3 is intended to be arranged for filtering the service, in the filter chamber 7. Daimler Truck AG 11 Dr. Britta Riege 12.12.2025The support dome 13 has a locking element 23 that is displaceable between a locked position shown in Figure 1, in which the inlet opening 17 is closed by the locking element 23 and therefore hidden from view, and a released position shown in Figure 2b), in which the inlet opening 17 is released. The locking element 23 is rotatably mounted between the locked position and the released position about a longitudinal axis L of the support dome 13, and the locking element 23 is biased into the locked position. In particular, the support dome 13 does not project beyond an edge 25 of the filter housing 5.
[0062] The filter device 1 preferably has a raw material drain 27, which is closed by the filter element 3 in its mounting position. The raw material drain 27 is formed on or arranged in the filter housing 5 such that unfiltered operating fluid can flow out of the filter chamber through the raw material drain 27 when the filter element 3 is changed.
[0063] The raw operating fluid inlet 9 is preferably fluidically connected via an operating fluid pump (not shown) to an operating fluid reservoir (also not shown), in particular an oil pan. The clean operating fluid outlet 11 is preferably fluidically connected to lubrication points of the vehicle. The raw operating fluid outlet 27, in turn, is preferably fluidically connected to the operating fluid reservoir, for example, the oil pan.
[0064] Preferably, the support dome 13 is arranged coaxially to the clean operating fluid outlet 11. In the embodiment shown here, the support dome 13 projects into the clean operating fluid outlet 11 with an outlet section 29 having the outlet opening 19, and is arranged in the filter chamber 7 with an inlet section 31 having the inlet opening 17.
[0065] Fig. 2 shows detailed representations of the embodiment according to Fig. 1 to explain the operation of the filter device 1.
[0066] Identical and functionally equivalent elements are marked with the same reference numerals in all figures, so that reference is made to the preceding description in each case. Furthermore, for the sake of clarity, elements appearing multiple times in a figure are marked with a reference numeral only once. Daimler Truck AG 12 Dr. Britta Riege 12.12.2025 In a), the locking element 23 is shown in its locked position, while in b) it is shown in its released position, so that the inlet openings 17 – which are several here – are visible.
[0067] The filter insert 3 has at least one actuating element 33 - see Figure 3 - which is designed to interact with a counter-actuating element 35 of the closure part 23 to move the closure part 23 between the locking position shown in a) and the release position shown in b).
[0068] The support dome 13 preferably has a retaining element 37, which is arranged and configured such that it aligns with the counter-actuating element 35 in the release position, wherein the actuating element 33 can interact with the retaining element 37 in the release position to hold the closing part 23 against the preload in the release position when the filter element 3 is fully arranged – in its mounting position – in the filter chamber 7. The retaining element 37 is preferably designed as a retaining groove, in particular as a recess or bead. The counter-actuating element 35 is preferably designed as a counter-actuating groove that aligns with the retaining groove in the release position.
[0069] A spring 39 – in particular a coil spring – is preferably arranged on the support dome 13. This spring is mechanically connected to the locking element 23 and configured to bias the locking element 23 into the locked position. The spring 39 is arranged on an end face 41 of the support dome 13.
[0070] In a) it is also shown that the locking part 23 is rotatably mounted about the longitudinal axis L between the locking position and the release position, as indicated here by an arrow P.
[0071] In b), it becomes clear that the support dome 13 has the inlet openings 17 on one side of a dome circumferential wall 43 – in particular in a dome opening area facing the viewer – with a diametrically opposite dome locking area of the dome circumferential wall 43 being closed. The closing element 23 has a plurality of flow openings 45 which, in the release position, are aligned with the inlet openings 17 and, in the locking position, do not overlap with the inlet openings 17 but are closed by the dome locking area. In particular, the closing element 23 itself has the flow openings 45 on one side in a closing element opening area 47 of a closing element circumferential wall 49, with a diametrically opposite closing element locking area 51 – see in a) – of the closing element circumferential wall 49. Daimler Truck AG 13 Dr. Britta Riege is closed on December 12, 2025.In the locked position, the locking section 51 covers the inlet openings 17, and the dome locking section closes the flow openings 45. In the unlocked position, the locking section opening area 47 releases the inlet openings 17.
[0072] Fig. 3 shows an embodiment of the filter insert 3 for the filter device 1 according to Fig. 1.
[0073] In a) the entire filter insert 3 is shown in longitudinal section; in b) a detailed section of the filter insert 3 with the actuating element 33 is shown enlarged.
[0074] The filter insert 3 has a support cage 53 which supports and carries the operating fluid filter 21, the support cage 53 being arranged inside the operating fluid filter 21.
[0075] The actuating element 33 is preferably designed as a radial actuating projection.
[0076] Fig. 4 shows initial illustrations of the embodiment of the filter device 1 according to Fig. 1 with the filter insert 3 according to Fig. 3 to explain the operation of the filter device 1.
[0077] Figure a) shows that when the filter insert 3 is axially displaced in the insertion direction – here downwards – the actuating element 33 initially engages the counter-actuating element 35 of the closure part 23 via the support dome 13, provided the filter insert 3 is correctly oriented circumferentially. Due to the preload, the counter-actuating element 35 is in the locked position. The filter insert 3 must then be rotated circumferentially – towards the release position – until the counter-actuating element 35 aligns with the retaining element 37. This means that the closure part 23 must be moved into the release position by rotating the filter insert 3 before the filter insert 3 can be moved axially further into the mounting position. During the rotation of the filter insert 3, the closure part 23 is carried along by the actuating element 33 engaging the counter-actuating element 35.In the release position, the locking element 23 preferably strikes a stop not shown here.
[0078] Figure b) shows that the actuating element 33 engages the retaining element 37 in the release position, whereby the filter insert 3 can now also be moved further in the axial direction to finally reach the assembly position. Daimler Truck AG 14 Dr. Britta Riege 12.12.2025 In the assembly position, the actuating element 33 establishes a mechanical connection between the counter-actuating element 35 and the retaining element 37.
[0079] Furthermore, in the assembly position, the retaining element 37 prevents the actuating element 33, and thus also the counter-actuating element 35 and ultimately the locking part 23, from being rotated out of the release position.
[0080] To remove the filter insert 3, it must first be pulled axially out in the removal direction – here upwards – until the actuating element 33 disengages from the retaining element 37; this releases the mechanical connection between the counter-actuating element 35 and the retaining element 37. If the filter insert 3 is pulled out axially further, the actuating element 33 also disengages from the counter-actuating element 35, and the locking element 23 is moved back into the locked position by the preload.
[0081] Fig. 5 shows a second representation of the embodiment of the filter device 1 according to Fig.
[0082] 1 with the filter insert 3 according to Fig. 3 to explain the operation of the filter device 1.
[0083] The filter element 3 is shown here in its mounting position in the filter chamber 7. The support dome 13 engages in the filter element 3, but extends only a first axial length Li into the filter element 3, which is smaller than a second axial length L2 of the filter element 3 itself.
[0084] The filter device 3 preferably also includes a filter housing cover 55, which is connected to the filter housing 5 to close the filter housing 5. The filter housing cover 55 can be opened or removed to change the filter element 3. The filter chamber 7 also includes the volume that is enclosed or limited by the filter housing cover 55 when closed.
[0085] During operation of the filter device 3, the operating fluid to be filtered flows – as schematically illustrated here by arrows – through the raw operating fluid inlet 9 into the filter chamber 7. From there, it passes through the operating fluid filter 21 as filtered operating fluid to the inlet openings 17 and through these into the flow channel 15, from which it flows out through the outlet opening 19 into the clean operating fluid outlet 11. The radial inlet openings 17 are thus fluidically connected to the outlet opening 19 via the flow channel 15. The raw operating fluid outlet 27 is sealed off from the filter chamber 7 by the filter element 3.
[0086] Fig. 6 shows a third representation of the embodiment of the filter device 1 according to Fig.
[0087] 1 with the filter insert 3 according to Fig. 3 to explain the operation of the filter device.
[0088] As previously explained, when the filter element 3 is changed, if it is moved axially in the removal direction – here upwards – the locking element 23 is released and returned to the locked position by the spring 39. At the same time, the filter element 3, now displaced from its mounting position, opens the raw operating fluid drain 27, allowing any unfiltered operating fluid B remaining in the filter chamber 7 to flow out through the raw operating fluid drain 27, while the clean operating fluid drain 11 is sealed by the locking element 23. Daimler Truck AG Dr. Britta Riege 12.12.2025
[0089] Reference symbol list
[0090] 1 filter device
[0091] 3 filter inserts
[0092] 5 filter housings
[0093] 7 Filter room
[0094] 9 Raw material supply
[0095] 11. Clean operating resource process
[0096] 13 Support Dome
[0097] 15 Flow channel
[0098] 17 Inlet opening
[0099] 19 Outlet
[0100] 21 Service fluid filters
[0101] 23 Locking part
[0102] 25 Rand
[0103] 27 Raw Materials and Operating Resources Flow
[0104] 29 Outflow section
[0105] 31 Inlet section
[0106] 33 Actuating element
[0107] 35 Counteracting element
[0108] 37 Holding element
[0109] 39 spring
[0110] 41 Front
[0111] 43 Cathedral perimeter wall
[0112] 45 Flow opening
[0113] 47 Closure part opening area
[0114] 49 Closure part circumferential wall
[0115] 51 Locking part locking area
[0116] 53 support cage
[0117] 55 Filter housing covers
[0118] B unfiltered operating fluid
Claims
Daimler Truck AG 17 Dr. Britta Riege 12.12.2025 Patent claims 1. Filter device (1) for filtering an operating fluid for a motor vehicle, comprising a filter housing (5) which has a filter chamber (7), a raw operating fluid inlet (9) for supplying unfiltered operating fluid (B) into the filter chamber (7) and a clean operating fluid outlet (11) for removing filtered operating fluid from the filter chamber (7), wherein a support dome (13) is arranged in the filter chamber (7) which is tightly connected to the clean operating fluid outlet (11) and has an inlet opening (17) opening into the filter chamber (7), an internal flow channel (15) and an outlet opening (19) opening into the clean operating fluid outlet (11), wherein the filter chamber (7) is configured to receive a filter element (3) having an operating fluid filter (21) such that a flow-technical filter connection is formed between the raw operating fluid inlet (9) and the inlet opening (17) formed above the operating fluid filter (21),wherein the filter element (3) separates the raw material supply (9) from the inlet opening (17) outside the flow-related filter connection when the filter element (3) is arranged as intended in the filter chamber (7), wherein the support dome (13) has a closing element (23) which is displaceable between a locked position in which the inlet opening (17) is closed by the closing element (23) and a release position in which the inlet opening (17) is released, wherein the closing element (23) is rotatably mounted between the locked position and the release position about a longitudinal axis (L) of the support dome (13), and wherein the closing element (23) is biased into the locked position.
2. Filter device (1) according to claim 1, with a filter element (3), wherein the filter element (3) comprises a service filter (21) and is configured to be arranged in the filter chamber (7) such that the flow-related filter connection is formed via the service filter (21), wherein the filter element (3) separates the raw service inlet (9) from the inlet opening (17) outside the flow-related filter connection when the filter element (3) is arranged as intended in the filter chamber (7), wherein the filter element (3) comprises at least one actuating element (33) configured to interact with the closing part (23), in particular with a counter-actuating element (35) arranged on the closing part (23), in order to move the closing part (23) between the locked position and the released position, in particular from the locked position to the released position. Daimler Truck AG 18 Dr. Britta Riege 12.12.2025 3.Filter device (1) according to claim 2, wherein the actuating element (33) is designed as an actuating projection.
4. Filter device (1) according to one of claims 2 or 3, wherein the support dome (13) has a retaining element (37) which is arranged and configured such that it is aligned with the counter-actuating element (35) in the release position, and that the actuating element (33) can cooperate with the retaining element (37) in the release position to hold the closing part (23) against the preload in the release position when the filter insert (3) is fully arranged in the filter chamber (7).
5. Filter device (1) Claim 4, wherein the retaining element (37) is designed as a retaining groove, wherein optionally the counter-actuating element (35) is designed as a counter-actuating groove which is aligned with the retaining groove in the release position.
6. Filter device (1) according to one of the preceding claims, wherein a spring (39), in particular a coil spring, is arranged on the support dome (13), which is mechanically connected to the closure part (23) and is configured to bias the closure part (23) into the locking position.
7. Filter device (1) according to one of the preceding claims, wherein the support dome (13) has a stop for the closure part (23) and / or the actuating element (33) in the release position.
8. Filter device (1) according to one of the preceding claims, wherein the support dome (13) has at least one inlet opening (17) on one side of a dome circumferential wall (43), wherein a diametrically opposite blocking area of the dome circumferential wall (43) is closed.
9. Filter insert (3) configured for use with a filter device (1) according to one of the preceding claims, wherein the filter insert (3) has at least one actuating element (33) configured to interact with the locking part (23), in particular with the counter-actuating element (35) arranged on the locking part (23), in order to move the locking part (23) between the locking position and the release position.
10. Filter insert (3) according to claim 9, wherein the actuating element (33) is formed on a support cage of the filter insert (3).