Discharge closure element for a filter system, filter element, and filter system

Abstract

The invention relates to a discharge closure element (150) for a filter system (100) for filtering a fluid, in particular oil or fuel, in particular of an internal combustion engine, comprising an element body (152) which can be connected to a filter housing (110) of the filter system (100) by means of a rotational and / or plug-in movement with respect to a longitudinal axis (80). The element body (152) has a discharge opening (176) which is closed and / or can be closed by means of a bypass valve (180). The invention additionally relates to a filter element (10) and to a filter system (100) for filtering a fluid, in particular oil or fuel, in particular of an internal combustion engine.

Description

[0001] Drain plug element for a filter system, filter element and filter system

[0002] Technical area

[0003] The invention relates to a drain closure element for a filter system, as well as a filter element and a filter system for filtering a fluid, in particular oil or fuel, in particular of an internal combustion engine.

[0004] State of the art

[0005] In the filter housings of openable, suspended filter systems, it is necessary to create a drain opening before unscrewing the housing cover, for example, during maintenance of the filter system, so that the fluid inside the housing can drain away. For this purpose, filters are usually equipped with plugs or similar devices. These plugs require a seal, such as an O-ring, to seal the raw and clean sides. A combination of a plug with an additional function, such as a bypass valve, also requires additional seals to seal against the filter housing.

[0006] WO 2014 / 082762 discloses a filter system for a fluid, in particular oil, fuel, water, or air, in particular of an internal combustion engine, in particular of a motor vehicle, comprising a filter housing having a fluid inlet and a fluid outlet, and in which a filter element is arranged such that it separates the fluid inlet from the fluid outlet. Furthermore, the filter system comprises a drain device for fluid contained in the filter housing, which has a housing drain opening that can be closed with a closure means. A separating element, which separates a clean fluid side of the filter element from a raw fluid side, has an element drain opening that can be closed with the closure means. Thus, the housing drain opening and the element drain opening are closed with the closure means when the drain device is closed.

[0007] WO 2019 / 120976 describes a filter element of a filter for liquid, in particular oil or fuel, in particular of an internal combustion engine, in particular of a motor vehicle, comprising a filter medium that surrounds an element interior in a continuous manner circumferentially with respect to an imaginary axis and that is connected to an end body on at least one end face axially relative to the axis. The end body has a filter element idle opening surrounding the axis, which is connected to the element interior, and a filter element sealing surface or filter element sealing surface of a filter element sealing device that surrounds the filter element idle opening in a continuous manner circumferentially and with which the filter element idle opening can be closed when the filter is assembled. The filter element sealing device has at least one seal that is circumferentially continuous with respect to the axis and is fastened to the filter element side.

[0008] WO 2019 / 120981 describes a similar filter element in which the filter element sealing surface or filter element sealing surface is directed axially with respect to the axis with at least one directional component. EP 2 072 103 A1 discloses a filter element for an oil filter of an internal combustion engine, in particular for motor vehicles, in which the filter element has a filter bypass valve attached to it in such a way that the filter element, together with the filter bypass valve, forms a structural unit intended for joint replacement. The filter bypass valve is firmly connected to the filter element, so that the user is forced to replace the filter bypass valve together with the filter element during regular maintenance work.

[0009] Disclosure of the invention

[0010] An object of the invention is to provide a drain closure element for a filter system for filtering a fluid, in particular oil or fuel, in particular of an internal combustion engine, which is improved with regard to a drainage solution.

[0011] A further object of the invention is to provide a filter element for a filter system for filtering a fluid, in particular oil or fuel, in particular of an internal combustion engine, which is improved with regard to a drainage solution.

[0012] A further object is to provide a filter system with an improved drainage solution for filtering a fluid, in particular oil or fuel, in particular of an internal combustion engine, with such a filter element.

[0013] The above-mentioned object is achieved according to one aspect of the invention with a drain closure element for a filter system for filtering a fluid, in particular oil or fuel, in particular of an internal combustion engine, comprising an element body which can be connected to a filter housing of the filter system with respect to a longitudinal axis by means of a rotary and / or plug-in movement, wherein the element body has a drain opening which can be closed and / or is closed with a bypass valve.

[0014] In a preferred embodiment, the drain closure element or a combination of a drain closure element with an additional component, such as a bypass valve, does not have an additional seal. In this embodiment, the filter system is sealed by the seals attached to the filter element, which are thus replaced when the filter element is changed. The drain closure element is therefore easy to manufacture, as no sealing grooves need to be created, and it is robust against damage. The drain closure element does not need to be replaced when the filter element is changed and can be reused after the filter change, as the relevant seals are renewed when the filter element is replaced. This also enables a shorter service time and significantly minimizes the risk of damage.

[0015] According to a further aspect of the invention, the further object is achieved by a filter element for a filter system for filtering a fluid, in particular oil or fuel, in particular of an internal combustion engine, with at least one filter medium which surrounds an element interior and which is connected to an end plate on at least one end face axially connected to a longitudinal axis, wherein the end plate has an element drain opening which is fluidically connected to the element interior and has at least one first sealing element which runs around the element drain opening and points radially inward and which, when installed as intended in a filter housing of the filter system, can be closed and / or is closed with a drain closure element arranged on a housing part of the filter housing, wherein the first sealing element is designed to bear sealingly against a first sealing surface of the drain closure element,wherein the end plate has a receiving portion which is designed to guide the drain closure element, which circumferentially surrounds the element drain opening and which has at least one second circumferential sealing element which, when installed as intended in the filter housing, sealingly bears against a sealing surface of the housing part, wherein the receiving portion has at least one third circumferential sealing element which sealingly bears against a second sealing surface of the drain closure element.

[0016] According to a further aspect of the invention, the further object is achieved by a filter system for filtering a fluid, in particular oil or fuel, in particular of an internal combustion engine, with a filter housing which has at least one fluid inlet and at least one fluid outlet and in which a filter element is arranged such that it separates the at least one fluid inlet from the at least one fluid outlet, and with a drain device for fluid contained in the filter housing, which has at least one housing drain opening which, during normal operation, can be closed and / or is closed with a drain closure element, wherein the filter element has at least one filter medium which surrounds an element interior and which is connected to an end plate on at least one end face, wherein the end plate has an element drain opening,which is connected to the interior of the element and can be closed and / or sealed with the drain closure element during normal operation.

[0017] Advantageous embodiments and advantages of the invention emerge from the further claims, the description and the drawing.

[0018] According to one aspect of the invention, a drain closure element for a filter system for filtering a fluid, in particular oil or fuel, in particular of an internal combustion engine, is proposed. The element body is connectable to a filter housing of the filter system by means of a rotational and / or insertion movement with respect to a longitudinal axis. The element body has a drain opening that is closable and / or closed with a bypass valve.

[0019] The proposed drain closure element serves to close an element drain opening of the filter element. The fluid in the filter element can drain through the element drain opening when the filter element is changed. The drain closure element also closes a housing drain opening of the filter housing of the filter system.

[0020] The drain closure element advantageously has an integrated bypass valve. In the event of high hydraulic pressure on the raw fluid side, the bypass valve allows the raw fluid to flow unfiltered through the drain closure element and the integrated bypass valve to the clean fluid side of the filter element and thus drain through the fluid outlet of the filter system.

[0021] The bypass valve is advantageously arranged on the reusable drain closure element and does not have to be replaced when the filter element is changed.

[0022] If the drain plug element is slowly unscrewed from the filter housing, only the housing drain opening can be exposed in a first step, allowing the raw fluid in the filter housing to drain. Only when the drain plug element is further unscrewed will the element drain opening also be exposed, allowing the filtered clean fluid in the filter element to drain.

[0023] The filter element can advantageously contain all the sealing elements to seal against the drain plug element. When the filter element is replaced, all the sealing elements are replaced simultaneously. The drain plug element can be reused.

[0024] According to a favorable embodiment of the drain closure element, the bypass valve can be formed at least partially in one piece with the element body. In this way, the bypass valve can be advantageously integrated into the drain closure element.

[0025] According to a favorable embodiment of the drain closure element, the bypass valve can have a valve body that is linearly displaceable against a compression spring and is pressed into a valve seat by the compression spring, wherein the compression spring is supported against a pressure surface arranged on the element body. In this way, the bypass valve can advantageously be designed as a mushroom valve.

[0026] According to a favorable embodiment of the drain closure element, the valve body can be guided on a linear guide connected to the element body, in particular one formed integrally with the element body. This allows the bypass valve to be manufactured cost-effectively.

[0027] According to a favorable embodiment of the drain closure element, the element body can have a first sealing surface for sealing against a sealing element of an element drain opening of a filter element of the filter system and a second sealing surface for sealing against a sealing element of a receiving portion of the filter element, wherein the sealing surfaces each circumferentially surround the longitudinal axis. In this way, the drain closure element can advantageously tightly close the element drain opening of the filter element and the housing drain opening of the filter housing.

[0028] According to a favorable embodiment of the drain closure element, the element body can comprise a connecting part and a centering part, wherein the centering part has the first sealing surface and the connecting part has the second sealing surface. In this way, the drain closure element can advantageously tightly close the element drain opening of the filter element and the housing drain opening of the filter housing.

[0029] In particular, the centering part can be movably connected to the connecting part along the longitudinal axis, in particular in an axially limited manner. In particular, the connecting part and the centering part can have complementary connecting elements of a connection, in particular a snap connection, which allows a movement, in particular an axially limited movement, of the centering part along the longitudinal axis relative to the connecting part. Such movement of the centering part against the connecting part can be particularly advantageous when using the filter element if strong pressure pulsations can occur during filtering of the fluid. Such pulsations can be particularly damaging to the first sealing element on the clean side of the filter element.

[0030] Advantageously, a drainage channel can be provided that extends to the outside of the filter housing when properly arranged. In particular, the drainage channel can be located in the connecting part. After partially unscrewing the drain closure element from the filter housing, raw fluid can be drained through the drainage channel.

[0031] According to a further aspect of the invention, a filter element for a filter system for filtering a fluid, in particular oil or fuel, in particular of an internal combustion engine, is proposed, comprising at least one filter medium which surrounds an element interior and which is connected to an end plate on at least one end face axially relative to a longitudinal axis. The end plate has an element drain opening which is fluidically connected to the element interior and has at least one first sealing element which extends around the element drain opening and points radially inward. When installed as intended in a filter housing of the filter system, the element can be closed and / or is closed by a drain closure element arranged on a housing part of the filter housing. The first sealing element is designed to bear sealingly against a first sealing surface of the drain closure element.The end plate has a receiving section designed to guide the drain closure element, which circumferentially surrounds the element drain opening, and which has at least one second circumferential sealing element, which, when properly installed in the filter housing, forms a sealing contact with a sealing surface of the housing part. The receiving section has at least one third circumferential sealing element, which forms a sealing contact with a second sealing surface of the drain closure element.

[0032] The proposed filter element has an element drain opening to allow the fluid contained in the filter element to drain away when the filter element is changed. This element drain opening can be closed with a drain closure element, which simultaneously closes a housing drain opening. The filter element advantageously has all the sealing elements to seal against the drain closure element. When the filter element is changed, all the sealing elements are thus replaced at the same time. The drain closure element can be reused. The sealing elements can, but do not necessarily have to, be O-rings. For example, the first sealing element can be arranged on the end plate and designed as a plastic lip made of the same material as the end plate. The other sealing elements can also be punched out of plastic material. The sealing elements can be O-rings, injection-molded, or designed as a seal with two lips.

[0033] The drain closure element can advantageously have an integrated bypass valve. When hydraulic pressure is high on the raw fluid side, the bypass valve allows the raw fluid to flow unfiltered through the drain closure element and the integrated bypass valve to the clean fluid side of the filter element, where it can then flow out through the fluid outlet of the filter system.

[0034] The bypass valve is advantageously arranged on the reusable drain closure element and does not have to be replaced when the filter element is changed.

[0035] If the drain plug element is slowly unscrewed from the filter housing, only the housing drain opening can be exposed in a first step, allowing the raw fluid in the filter housing to drain. Only when the drain plug element is further unscrewed will the element drain opening also be exposed, allowing the filtered clean fluid in the filter element to drain.

[0036] According to a favorable embodiment of the filter element, the first, second, and third sealing elements can be designed as radially sealing sealing elements. This allows for a reliable seal between the drain closure element and the filter element and the filter housing.

[0037] According to a favorable embodiment of the filter element, the second sealing element can be arranged on the radial outer side of the receiving section, and the third sealing element can be arranged on a radial inner side of the receiving section. This allows the second sealing element to advantageously seal against the filter housing, and the third sealing element to advantageously seal against a radially inner contour of the drain closure element.

[0038] In an alternative embodiment, the second and third sealing elements can be arranged on a radially outer side of the receiving portion. This allows the second sealing element to advantageously seal against the filter housing, and the third sealing element to advantageously seal against a radially outer contour of the drain closure element.

[0039] According to a favorable embodiment of the filter element, one of the second and third sealing elements can be arranged at a greater radial distance from the longitudinal axis than the other of the second and third sealing elements. This enables favorable assembly of the drain closure element and effective sealing of the filter element and the drain closure element in the filter housing. In particular, the second sealing element can be arranged on the radial outer side of the receiving section, and the third sealing element can be arranged on a radial inner side of the receiving section.

[0040] According to a favorable design of the filter element, the second sealing element can be arranged at the same height along the longitudinal axis as the third sealing element, or the second sealing element can be arranged along the longitudinal axis between the first sealing element and the third sealing element. An arrangement at the same height along the longitudinal axis is particularly advantageous if the second sealing element is arranged on the radial outer side and the third sealing element is arranged on the radial inner side of the receiving section. However, for geometric reasons regarding the arrangement of the receiving section and the drain closure element in the filter housing, an arrangement at different heights can also be advantageous.

[0041] According to a favorable embodiment of the filter element, the receiving section can be movably connected to the end plate along the longitudinal axis, in particular in an axially limited manner. In particular, the receiving section and the end plate can have complementary connecting elements of a connection that allows a movement, in particular an axially limited movement, of the receiving section along the longitudinal axis relative to the end plate. Such a movement of the receiving section against the filter element can be particularly advantageous when using the filter element if strong pressure pulsations can occur during filtering of the fluid. Such pulsations can be particularly damaging to the first sealing element on the clean side of the filter element.

[0042] According to a favorable design of the filter element, the first sealing element can be integrated into the end plate. In particular, the first sealing element can be formed integrally with the end plate. This allows the first sealing element to be manufactured particularly efficiently. This can also advantageously provide a reliable seal against the drain closure element.

[0043] According to a further aspect of the invention, a filter system for filtering a fluid, in particular oil or fuel, in particular of an internal combustion engine, is proposed, comprising a filter housing which has at least one fluid inlet and at least one fluid outlet and in which a filter element is arranged such that it separates the at least one fluid inlet from the at least one fluid outlet. The filter system further comprises a drain device for fluid contained in the filter housing, which has at least one housing drain opening which, during normal operation, can be closed and / or is closed with a drain closure element. The filter element has at least one filter medium which surrounds an element interior and which is fluidically connected to an end plate on at least one end face.The end plate has an element drain opening that is connected to the element interior and, during normal operation, can be closed and / or sealed with the drain closure element. The filter element of the proposed filter system has an element drain opening to allow the fluid in the filter element to drain away when the filter element is replaced. This element drain opening can be closed with a drain closure element, which simultaneously closes a housing drain opening. The filter element advantageously has all the sealing elements to seal against the drain closure element. When the filter element is replaced, all the sealing elements are thus replaced simultaneously. The drain closure element can be reused.

[0044] The drain closure element can advantageously have an integrated bypass valve. When hydraulic pressure is high on the raw fluid side, the bypass valve allows the raw fluid to flow unfiltered through the drain closure element and the integrated bypass valve to the clean fluid side of the filter element, where it can then flow out through the fluid outlet of the filter system.

[0045] Advantageously, the bypass valve is arranged on the reusable drain closure element and does not have to be replaced when the filter element is changed.

[0046] The sealing elements can, but do not necessarily have to, be O-rings. For example, the first sealing element can be located on the end plate and designed as a plastic lip made of the same material as the end plate. The other sealing elements can also be punched from plastic material. The sealing elements can be O-rings, molded onto the end plate, or designed as a seal with two lips.

[0047] If the drain plug element is slowly unscrewed from the filter housing, only the housing drain opening can be exposed in a first step, allowing the raw fluid in the filter housing to be drained. Only when the drain plug element is further unscrewed will the element drain opening also be exposed, allowing the filtered clean fluid in the filter element to be drained.

[0048] According to a favorable embodiment of the filter system, the drain closure element can have an element body with a first sealing surface for sealing against a sealing element of the element drain opening of the filter element and a second sealing surface for sealing against a sealing element of a receiving portion of the filter element, which each circumferentially surround a longitudinal axis. The drain closure element can be connected and / or attached to the filter housing with respect to the longitudinal axis by means of a rotating and / or plugging movement. The element body has a drain opening that can be closed and / or sealed with a bypass valve. The drain closure element can thus advantageously be used to tightly close and reopen the element drain opening and the housing drain opening.At high hydraulic pressure on the raw fluid side, the bypass valve allows the raw fluid to flow unfiltered through the drain closure element and the integrated bypass valve to the clean fluid side of the filter element, allowing it to drain through the fluid outlet of the filter system. According to a favorable embodiment of the filter system, the bypass valve can be formed at least partially in one piece with the element body. In this way, the bypass valve can be advantageously integrated into the drain closure element.

[0049] According to a favorable embodiment of the filter system, the bypass valve can have a valve body that is linearly displaceable against a compression spring and pressed into a valve seat by the compression spring, wherein the compression spring is supported against a pressure surface arranged on the element body. In particular, the valve body can be guided on a linear guide connected to the element body, in particular molded onto the element body. In this way, the bypass valve can advantageously be designed as a mushroom valve and can be manufactured inexpensively.

[0050] According to a favorable embodiment of the filter system, the element body can comprise a connecting part and a centering part, wherein the centering part has the first sealing surface and the connecting part has the second sealing surface. In this way, the drain closure element can advantageously tightly close the element drain opening of the filter element and the housing drain opening of the filter housing.

[0051] According to a favorable embodiment of the filter system, the centering part can be movably connected to the connecting part along the longitudinal axis, in particular in an axially limited manner. In particular, the connecting part and the centering part can have complementary connecting elements of a connection that allows a movement, in particular an axially limited movement, of the centering part along the longitudinal axis relative to the connecting part. Such a movement of the receiving section against the filter element can be particularly advantageous when using the filter element if strong pressure pulsations can occur during filtering of the fluid. Such pulsations can be particularly damaging to the first sealing element on the clean side of the filter element.

[0052] Advantageously, a drainage channel can be provided that extends to the outside of the filter housing when properly arranged. In particular, the drainage channel can be located in the connecting part. Raw fluid located in the filter housing can be advantageously drained via the drainage channel, which can preferably be arranged in the drain closure element, after the drain closure element has been partially unscrewed from the filter housing.

[0053] Short description of the drawings

[0054] Further advantages will become apparent from the following description of the drawings. The drawings illustrate exemplary embodiments of the invention. The drawings, the description, and the claims contain numerous features in combination. Those skilled in the art will expediently consider the features individually and combine them into useful further combinations. The following are shown by way of example: Figure 1 shows an isometric view of a filter system for filtering a fluid, in particular oil or fuel, in particular of an internal combustion engine, according to an exemplary embodiment of the invention;

[0055] Figure 2 is an isometric view of the filter system according to Figure 1 without the upper housing part;

[0056] Figure 3 is a sectional view of the filter system according to Figure 2; Figure 4 is a sectional view of a filter element according to an embodiment of the invention;

[0057] Figure 5 is a sectional view of a drain closure element according to an embodiment of the invention;

[0058] Figure 6 is a sectional view of a filter system according to a further embodiment of the invention; and

[0059] Figure 7 is an enlarged view of the area of ​​a drain device of the filter system according to Figure 6.

[0060] Embodiments of the invention

[0061] In the figures, identical or similar components are numbered with the same reference numerals. The figures show only examples and are not to be understood as limiting.

[0062] To explain the invention, Figure 1 shows an isometric view of a filter system 100 for filtering a fluid, in particular oil or fuel, in particular of an internal combustion engine, according to an exemplary embodiment of the invention. Figure 2 shows an isometric view of the filter system 100 according to Figure 1 without the upper housing part 114. Figure 3 shows a sectional view of the filter system 100 according to Figure 2, while Figure 4 shows a sectional view of the filter element 10.

[0063] The filter system 100 comprises a filter housing 110 with two housing parts 112, 114, which are connected via a screw thread 124. The two housing parts 112, 114 are sealed by a housing seal 126, for example, an O-ring. The second housing part 114 has a fluid inlet 102 and a fluid outlet 104. A filter element 10 is arranged in the filter housing 110 such that it separates the at least one fluid inlet 102 from the at least one fluid outlet 104.

[0064] The filter system 100 comprises a drain device 116 for fluid contained in the filter housing 110, which has a housing drain opening 118 which, during normal operation, can be closed and / or is closed with a drain closure element 150.

[0065] The drain closure element 150 can be connected to the filter housing 110 by means of a rotating and / or plugging movement with respect to the longitudinal axis 80. For this purpose, the drain closure element 150 has an external thread 156, and the housing part 114 of the filter housing 110 has an internal thread 122.

[0066] The filter element 10 comprises a filter medium 12 surrounding an element interior 14 and connected to end plates 18, 19 at the axial end faces 16, 17. The filter medium 12 is mechanically supported on its inner side by a support tube 13 against the hydraulic pressure of the flowing fluid.

[0067] Raw fluid flowing in through the fluid inlet 102 flows tangentially toward the filter element 10, passes through the filter medium 12 of the filter element 10 into the element interior 14, and exits the filter element 10 through the axially arranged fluid outlet 104. The end plate 18 has an element drain opening 20 that is fluidically connected to the element interior 14 and has at least one first sealing element 32 that extends around the element drain opening 20 and points radially inward. When the filter element 10 is properly installed in the filter housing 110 of the filter system 100, the element drain opening 20 is and / or can be closed with the drain closure element 150 arranged on the housing part 112 of the filter housing 110. The first sealing element 32 is designed to sealingly bear against the first sealing surface 172 of the drain closure element 150.

[0068] The first sealing element 32 is integrated into the end plate 18. In particular, the first sealing element 32 can be formed integrally with the end plate 18.

[0069] The end plate 18 has a receiving portion 22 designed to guide the drain closure element 150. The receiving portion 22 circumferentially surrounds the element drain opening 20 and has a second circumferential sealing element 34, which, when properly installed in the filter housing 110, sealingly engages a sealing surface 130 of the housing part 112. The receiving portion 22 has a third circumferential sealing element 36, which sealingly engages a second sealing surface 174 of the drain closure element 150.

[0070] As can be seen particularly in Figure 3, the drain closure element 150 has an element body 152 with the first sealing surface 172 for sealing against the sealing element 32 of the element drain opening 20 of the filter element 10 and with the second sealing surface 174 for sealing against the sealing element 36 of the receiving portion 22 of the filter element 10. The sealing surfaces 172, 174 each circumferentially surround the longitudinal axis 80.

[0071] The first, second and third sealing elements 32, 34, 36 are designed as radially sealing sealing elements 32, 34, 36.

[0072] The second sealing element 34 is arranged on the radial outer side 24 of the receiving section 22 and the third sealing element 36 is arranged on a radial inner side 26 of the receiving section 22.

[0073] In an alternative embodiment not shown, however, the second and third sealing elements 34, 36 could also be arranged on a radial outer side 24 of the receiving portion 22. For this purpose, the contour of the connecting part 153 would also have to be modified and have a sealing surface 174 arranged radially outward and directed radially inward.

[0074] The second sealing element 34 is arranged at a greater radial distance 28 from the longitudinal axis 80 than the third sealing element 36.

[0075] Furthermore, the second sealing element 34 is arranged at the same height of the longitudinal axis 80 as the third sealing element 36. In an alternative embodiment not shown, however, the second sealing element 34 could also be arranged along the longitudinal axis 80 between the first sealing element 32 and the third sealing element 36.

[0076] As can be seen in Figure 4, the first sealing element 32 is molded onto the end plate 18 and thus integrally connected to the end plate 18. The second and third sealing elements 34, 36 are arranged on the receiving section 22 connected to the end plate 18. Thus, the first, second, and third sealing elements 32, 34, 36 are connected to the filter element 10 and are replaced when the filter element 10 is replaced.

[0077] As can be seen particularly in the sectional view of the drain closure element 150 of the filter system 100 in Figure 5, the element body 152 of the drain closure element 150 comprises a connecting part 153 and a centering part 154. The centering part 154 has the first sealing surface 172, and the connecting part 153 has the second sealing surface 174. The drain closure element 150 has no seal and / or sealing grooves. Sealing is achieved at the sealing surfaces 172, 174 by the sealing elements 32, 34, 36 attached to the filter element.

[0078] The element body 152 further has a drain opening 176, which is closable and / or sealed by a bypass valve 180. The bypass valve 180 can advantageously be formed at least partially in one piece with the element body 152. At high hydraulic pressure on the raw fluid side, the raw fluid can flow unfiltered through the drain closure element 150 and the bypass valve 180 integrated therein to the clean fluid side of the filter element 10 and thus flow out through the fluid outlet 104 of the filter system 100.

[0079] The bypass valve 180 has a valve body 182 which is linearly displaceable against a compression spring 188 and which is pressed into a valve seat 184 by means of the compression spring 188, wherein the compression spring 188 is supported against a pressure surface 190 arranged on the element body 152.

[0080] The valve body 182 is guided on a linear guide 186 connected to the element body 152, in particular formed on the element body 152. The linear guide 186, in turn, is firmly connected to the centering part 154 of the drain closure element 150 and can, for example, be inserted into the centering part 154 and / or snapped to the centering part 154. For this purpose, a connecting element 196 of a connection 192, in particular a snap connection 192, can be arranged on the linear guide 186, which interacts with a complementary connecting part 194 arranged on the centering part 154.

[0081] For the flow of the raw fluid, the receiving section 22 and the connecting part 153 of the drain closure element 150 have fluid openings 23, 155. Hydraulic pressure from the raw fluid flowing through the fluid openings 23, 155 of the receiving section 22 and the connecting part 153 into the element body 152 can lift the valve body 182 from its valve seat 184 against the restoring force of the compression spring 188, thus opening the bypass valve 180. The raw fluid can then flow through the interior of the centering part 154 and the drain opening 176 into the interior 14 of the filter element and out via the fluid outlet 104 of the filter housing 110.

[0082] Optionally, the connecting part 153, when properly arranged, may have a drain channel 170 (see Figure 3) leading to an outer side 120 of the filter housing 110. After the drain closure element 150 has been partially unscrewed from the filter housing 110, the raw fluid located in the filter housing 110 can advantageously flow out via the drain channel 170.

[0083] Figure 6 shows a sectional view of a filter system 100 according to another embodiment of the invention. Figure 7 shows an enlarged view of the area of ​​the drain device 116 of the filter system 100.

[0084] The filter system 100 is designed similarly to the filter system 100 shown in Figures 1 to 3. The difference is that in the embodiment shown in Figures 4 and 5, relative movements of the filter element 10 against the filter housing 110 due to pressure pulsations during filter operation are tolerated.

[0085] For this purpose, the receiving section 22 is movably connected to the end plate 18 along the longitudinal axis 80, in particular in an axially limited manner. The receiving section 22 and the end plate 18 have complementary connecting elements 42, 44 of a connection 40, in particular a snap connection 40, which allows a particularly axially limited movement of the receiving section 22 along the longitudinal axis 80 relative to the end plate 18. During assembly of the filter element 10, the receiving section 22 can snap into the connecting element 44 arranged on the end plate 18 with its connecting element 42.

[0086] Furthermore, the centering part 154 of the drain closure element 150 is movably connected to the connecting part 153 along the longitudinal axis 80, in particular in an axially limited manner. The connecting part 153 and the centering part 154 have complementary connecting elements 162, 164 of a connection 160, in particular a snap connection 160, which allows a movement, in particular an axially limited movement, of the centering part 154 along the longitudinal axis 80 relative to the connecting part 153. During assembly of the drain closure element 150, the connecting part 153 can snap into the connecting element 164 arranged on the centering element 154 with its connecting element 162. Reference numeral

[0087] 10 filter element

[0088] 12 Filter medium

[0089] 13 Support tube

[0090] 14 Element interior

[0091] 16 Front side

[0092] 17 Front side

[0093] 18 End plate

[0094] 19 End plate

[0095] 20 Element drain opening

[0096] 22 Recording section

[0097] 23 Fluid opening

[0098] 24 Outside

[0099] 26 Inside

[0100] 28 radial distance

[0101] 32 first sealing element

[0102] 34 second sealing element

[0103] 36 third sealing element

[0104] 40 connection

[0105] 42 connecting element

[0106] 44 Connecting element

[0107] 80 Longitudinal axis

[0108] 100 filter system

[0109] 102 Fluid inlet

[0110] 104 Fluid outlet

[0111] 110 filter housings

[0112] 112 Housing part

[0113] 114 Housing part

[0114] 116 Drainage device

[0115] 118 Housing drain opening

[0116] 120 outside

[0117] 122 internal thread

[0118] 130 sealing surface

[0119] 150 drain plug element

[0120] 152 element bodies

[0121] 153 connecting part

[0122] 154 Centering part

[0123] 155 Fluid opening

[0124] 156 external threads

[0125] 160 connection

[0126] 162 connecting element

[0127] 164 connecting element

[0128] 170 drainage channel

[0129] 172 first sealing surface

[0130] 174 second sealing surface

[0131] 176 Drain opening

[0132] 180 bypass valve

[0133] 182 valve body

[0134] 184 valve seat

[0135] 186 Linear guide

[0136] 188 compression spring

[0137] 190 print area

[0138] 192 connection

[0139] 194 connecting element

[0140] 196 connecting element

Claims

Claims 1. Drain closure element (150) for a filter system (100) for filtering a fluid, in particular oil or fuel, in particular of an internal combustion engine, comprising an element body (152) which can be connected to a filter housing (110) of the filter system (100) with respect to a longitudinal axis (80) by means of a rotating and / or plugging movement, wherein the element body (152) has a drain opening (176) which can be closed and / or is closed by a bypass valve (180).

2. Drain closure element according to claim 1, wherein the bypass valve (180) is at least partially formed integrally with the element body (152).

3. Drain closure element according to claim 1 or 2, wherein the bypass valve (180) has a valve body (182) which is linearly displaceable against a compression spring (188) and which is pressed into a valve seat (184) by means of the compression spring (188), wherein the compression spring (188) is supported against a pressure surface (190) arranged on the element body (152).

4. Drain closure element according to one of the preceding claims, wherein the element body (152) has a first sealing surface (172) for sealing against a sealing element (32) of an element drain opening (20) of a filter element (10) of the filter system (100) and a second sealing surface (174) for sealing against a sealing element (36) of a receiving section (22) of the filter element (10), wherein the sealing surfaces (172, 174) each circumferentially surround the longitudinal axis (80).

5. Drain closure element according to one of the preceding claims, wherein the element body (152) comprises a connecting part (153) and a centering part (154), wherein the centering part (154) has the first sealing surface (172) and the connecting part (153) has the second sealing surface (174), in particular wherein the centering part (154) is movably connected to the connecting part (153) along the longitudinal axis (80), in particular in an axially limited manner, in particular wherein the connecting part (153) and the centering part (154) have complementary connecting elements (162, 164) of a connection (160), in particular a snap connection (160), which allows a movement, in particular in an axially limited manner, of the centering part (154) along the longitudinal axis (80) relative to the connecting part (153).

6. Drain closure element according to one of the preceding claims, wherein the drain closure element (150) has at least one sealing surface (172, 174) but no seal and / or seal receptacle.

7. Filter element (10) for a filter system (100) for filtering a fluid, in particular oil or fuel, in particular of an internal combustion engine, with at least one filter medium (12), which which surrounds an element interior (14) and which is connected to an end plate (18) on at least one end face (16) axial with respect to a longitudinal axis (80), wherein the end plate (18) has an element drain opening (20) which is fluidically connected to the element interior (14) and has at least one first sealing element (32) which runs around the element drain opening (20), which points radially inwards and which, when installed as intended in a filter housing (110) of the filter system (100), can be closed and / or closed with a drain closure element (150) according to one of the preceding claims, which is arranged on a housing part (112) of the filter housing (110), wherein the first sealing element (32) is designed to bear sealingly against a first sealing surface (172) of the drain closure element (150), wherein the end plate (18) has a receiving section (22) which is used to guide the drain closure element (150),which circumferentially surrounds the element drain opening (20) and which has at least one second circumferential sealing element (34) which, when installed as intended in the filter housing (110), sealingly bears against a sealing surface (130) of the housing part (112), wherein the receiving section (22) has at least one third circumferential sealing element (36) which sealingly bears against a second sealing surface (174) of the drain closure element (150).

8. Filter element according to claim 7, wherein the first, second and third sealing elements (32, 34, 36) are designed as radially sealing sealing elements (32, 34, 36).

9. Filter element according to claim 7 or 8, wherein the second sealing element (34) is arranged on the radial outer side (24) of the receiving section (22) and the third sealing element (36) is arranged on a radial inner side (26) of the receiving section (22), or wherein the second and third sealing elements (34, 36) are arranged on a radial outer side (24) of the receiving section (22).

10. Filter element according to one of claims 7 to 9, wherein one of the second and third sealing elements (34, 36) is arranged at a greater radial distance (28) from the longitudinal axis (80) than the other of the second and third sealing elements (36, 34).

11. Filter element according to one of claims 7 to 10, wherein the second sealing element (34) is arranged along the longitudinal axis (80) between the first sealing element (32) and the third sealing element (36) or wherein the second sealing element (34) is arranged at the same height of the longitudinal axis (80) as the third sealing element (36).

12. Filter element according to one of claims 7 to 11, wherein the receiving section (22) is movably connected to the end plate (18) along the longitudinal axis (80), in particular axially limited, in particular wherein the receiving section (22) and the end plate (18) have complementary connections. connection elements (42, 44) of a connection (40) which allows a, in particular axially limited, movement of the receiving portion (22) along the longitudinal axis (80) relative to the end plate (18).

13. Filter element according to one of claims 7 to 12, wherein the first sealing element (32) is integrated into the end plate (18), in particular wherein the first sealing element (32) is formed integrally with the end plate (18).

14. Filter system (100) for filtering a fluid, in particular oil or fuel, in particular of an internal combustion engine, with a filter housing (110) which has at least one fluid inlet (102) and at least one fluid outlet (104) and in which a filter element (10) according to one of claims 7 to 13 is arranged such that it separates the at least one fluid inlet (102) from the at least one fluid outlet (104), and with a drain device (116) for fluid contained in the filter housing (110), which has at least one housing drain opening (118) which, during normal operation, can be closed and / or is closed with a drain closure element (150) according to one of claims 1 to 6, wherein the filter element (10) has at least one filter medium (12) which surrounds an element interior (14) and which is connected to an end plate (18) on at least one end face (16), wherein the End plate (18) has an element drain opening (20),which is fluidically connected to the element interior (14) and can be closed and / or closed with the drain closure element (150) during normal operation.

15. Filter system according to claim 14, wherein the drain closure element (150) has an element body (152) with a first sealing surface (172) for sealing against a sealing element (32) of the element drain opening (20) of the filter element (10) and a second sealing surface (174) for sealing against a sealing element (36) of a receiving section (22) of the filter element (10), which each circumferentially surround a longitudinal axis (80), wherein the drain closure element (150) is connectable and / or connected to the filter housing (110) with respect to the longitudinal axis (80) by means of a rotating and / or plugging movement, wherein the element body (152) has a drain opening (176) which is closable and / or closed by a bypass valve (180).

16. Filter system according to claim 14 or 15, wherein the bypass valve (180) is at least partially formed integrally with the element body (152).

17. Filter system according to one of claims 14 to 16, wherein the bypass valve (180) has a valve body (182) which is linearly displaceable against a compression spring (188) and which is pressed into a valve seat (184) by means of the compression spring (188), wherein the compression spring (188) is supported against a pressure surface (190) arranged on the element body (152), in particular wherein the Valve body (182) is guided on a linear guide (186) connected to the element body (152), in particular formed on the element body (152).

18. Filter system according to one of claims 14 to 17, wherein the element body (152) comprises a connecting part (153) and a centering part (154), wherein the centering part (154) forms the first sealing surface (172) and the connecting part (153) has the second sealing surface (174).

19. Filter system according to claim 18, wherein the centering part (154) is movably connected to the connecting part (153) along the longitudinal axis (80), in particular axially limited, in particular wherein the connecting part (153) and the centering part (154) have complementary connecting elements (162, 164) of a connection (160) which allows a movement, in particular axially limited, of the centering part (154) along the longitudinal axis (80) relative to the connecting part (153).

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