Filter system for fluids, in particular oil or fuel

Abstract

The invention relates to a filter system 100 for fluids, in particular oil or fuel, comprising at least a pot-shaped filter housing 10 having a housing-fixed support tube 20 oriented along a longitudinal axis 80 and a filter element 40 arranged around the support tube 20, the support tube 20 being designed as a fluid penetration, in particular a fluid outlet 14. The open end 18 of the filter housing 10 comprises a fluid penetration, in particular a fluid inlet 12, and a circumferential sealing element 30 for sealing against the coupling flange 60 when mounted in accordance with the specification. The support tube 20 has a thread 22 at its free end 38 facing away from the filter housing 10 for threaded connection to the coupling flange 60 and has at least one penetration opening 24 for a fluid, in particular filtered, along the longitudinal extension of the support tube 20. According to the invention, the support tube 20 is integrally formed with the filter housing 10.

Description

Technical Field

[0001] The invention relates to a filtration system for fluids, in particular oils, fuels or cooling liquids, in particular a filtration system for an internal combustion vehicle or an electrically operated vehicle. The filtration system can be part of an electric axle of a hybrid vehicle or an electric vehicle. Background Art

[0002] DE 197 00 564 A1 discloses a filtration system for the lubricating oil of an internal combustion engine in particular. The filtration system consists of a pot-shaped filter housing, a support tube arranged in the filter housing, and a filter element fastened to the support tube. The filter element consists essentially of a filter medium folded in a zigzag manner. Here, the filter housing directly receives a seal for sealing between the housing and the flange. The support tube is provided with a screw thread and can be fastened to the flange by means of a threaded connection.

[0003] DE 10 2015 114 320 A1 describes a fluid filter having: a housing having a fluid inlet and a fluid outlet; a central support tube forming the fluid outlet; a filter insert inserted onto the support tube; and a valve unit. The support tube has threads at its axial end regions for connection to the housing and to a filter connection flange on the one hand and on the other hand. In addition, the support tube has penetration openings in the region between these end regions. The support tube has, in the region between its axial end regions, on its outer circumference, guide elements for at least one valve body of the valve unit and / or guide elements and holding elements for a valve spring support of the valve unit. Summary of the Invention

[0004] The object of the invention is to implement an easily processable and cost-effective filtration system for fluids, in particular oils or fuels.

[0005] The object mentioned above is achieved according to an aspect of the invention by means of a filtration system for fluids, in particular oils or fuels, which at least comprises a pot-shaped filter housing having a support tube fixed to the housing and oriented along a longitudinal axis and a filter element arranged around the support tube, wherein the support tube is configured as a fluid penetration part, in particular a fluid outlet, wherein the open end of the filter housing comprises a fluid penetration part, in particular a fluid inlet, and a surrounding sealing element which is used for sealing relative to a connection flange during proper assembly, wherein the support tube has a thread for threaded connection to the connection flange at its free end facing away from the filter housing and has at least one penetration opening for the fluid which has been filtered in particular along the longitudinal extension of the support tube. The support tube is integrally constructed with the filter housing.

[0006] Advantageous design options and advantages of the invention result from the further claims, the description and the drawings.

[0007] The invention relates to a filtration system for fluids, in particular oil or fuel, which filtration system at least comprises a pot-shaped filter housing having a housing-fixed support tube oriented along a longitudinal axis and a filter element arranged around the support tube, wherein the support tube is configured as a fluid penetration, in particular a fluid outlet. The open end of the filter housing comprises a fluid penetration, in particular a fluid inlet, and a surrounding sealing element which, in the case of proper assembly, serves for sealing against a connection flange. The support tube has a thread at its free end facing away from the filter housing for a threaded connection with the connection flange, wherein the thread can be introduced into the material of the support tube or can be carried by a separate component which is firmly, in particular non-loosely, connected to the support tube. Along the longitudinal extent of the support tube, the support tube has at least one penetration opening for the fluid, in particular the filtered fluid.

[0008] According to the invention, the support tube is integrally constructed with the filter housing. Here, the thread and the support tube are not necessarily integrally formed. Preferably, the filter housing and the support tube are constructed as an integrally formed plastic injection molding. The thread at the support tube is advantageously metallic and firmly connected to the support tube. For this purpose, the thread can, for example, be configured as a threaded sleeve in the form of an insert and be embedded in the material of the support tube during the injection molding process. The threaded component can also be connected to the support tube after manufacturing the filter housing having the support tube.

[0009] The proposed filtration system has a filter housing configured as a filter cover which can advantageously be integrally made of plastic and which has an axial sealing portion.

[0010] The filter housing includes a central threaded rod which also serves simultaneously as a support tube for the filter element and which includes a sealing portion for the filter element. The filtration system furthermore includes a filter element. In this way, the replaceable filter flange can advantageously be sealed off by the filter housing.

[0011] The support tube is made of the same material as the rest of the filter housing and is advantageously manufactured in one piece with the filter cover. The filter housing has an axial sealing principle and is screwed onto the connection flange like a replaceable filter. It is possible to advantageously use an axial molded sealing portion as the sealing element instead of an axially sealed portion pierced by a hose in order to keep the reaction force of the sealing portion as low as possible.

[0012] If the filter housing is made of plastic, the filter housing advantageously has high corrosion resistance. The filtration system comprises few components, such as the filter housing, the axial seal, the filter element and can be assembled in an easy manner. No welding process or joining process is required. Thereby, the filtration system can be processed at low cost.

[0013] According to an advantageous design of the filtration system, the filter element can have a filter medium body which is closed at the end sides by end disks, wherein at least one of the end disks is configured for radial sealing relative to the support tube. Advantageously, both end disks can be sealed radially relative to the support tube. Thereby, the clean side of the filtration system can be separated from the raw side in an easy manner.

[0014] According to an advantageous design of the filtration system, at least one penetration opening can extend inclined with respect to the longitudinal axis in the direction of the open end of the filter housing. In this way, the filter housing and the support tube can advantageously be manufactured as one piece in an injection molding process and demolded. Furthermore, the penetration opening extending inclined with respect to the longitudinal axis has a positive effect on the flow characteristics.

[0015] According to an advantageous design of the filtration system, the sealing element can be configured for axial sealing relative to the connection flange. Thereby, the filtration system can be screwed onto the connection flange in a suitable manner and thus sealed relative to the connection flange provided with a flat sealing surface in an easy manner.

[0016] According to an advantageous design of the filtration system, the sealing element can be configured as a molded seal which is arranged in a circumferential groove of the filter housing. The sealing element can advantageously completely fill the groove of the filter housing and thus effect a permanent and robust seal of the filtration system relative to the connection flange.

[0017] According to an advantageous design of the filtration system, the filter housing can have radial reinforcing ribs at its closed end. In this way, the filter housing, which can be made of plastic and is thus less rigid compared to a metal housing, can be reinforced relative to the fluid pressure in order to maintain its shape especially even at higher temperatures. Here, the fluid pressure can advantageously be limited to a maximum of 25 bar. The fluid temperature can typically be in the range from -40 °C to 150 °C.

[0018] According to an advantageous design of the filtration system, the filter housing can have, at its closed end, a tool receiving portion that opens axially outward, especially for a screwdriver tool. According to a further design, the filter housing has a tool receiving portion at its outer radial end, which facilitates the fastening and loosening of the filter housing. Thus, reliable sealing can be achieved when screwing the filter housing onto the connection flange. The fixed filter housing can also be loosened from the connection flange with the aid of a tool.

[0019] According to an advantageous design of the filtration system, the filter element can be arranged replaceably around the support tube. In this way, the filter element can be easily replaced by pulling out the support tube.

[0020] According to an advantageous design of the filtration system, the filter housing can be made of plastic. In particular, the filter housing can be constructed as a plastic injection molding. The plastic housing can be easily and inexpensively processed and can have high stability against environmental influences. In addition, the plastic housing has a low weight.

[0021] According to an advantageous design of the filtration system, the filter housing can be constructed conically with an inner diameter increasing towards the open end. Such a shape is beneficial for demolding in the plastic injection molding process for manufacturing the filter housing.

[0022] In an alternative embodiment, it is also possible that the filter housing is manufactured as a metal housing. In particular, the filter housing can be constructed as a die casting, especially as an aluminum die casting. In this case, the thread can be directly introduced into the end region of the support tube, so that no separate threaded component is required. With this embodiment, low processing costs can also be achieved with high stability of the filter housing. Description of the Drawings

[0023] Further advantages result from the following description of the drawings. Embodiments of the invention are shown in the drawings. The drawings, the description, and the claims include a large number of combined features. A person skilled in the art will also consider these features separately in a suitable manner and summarize them into meaningful additional combinations.

[0024] Exemplarily shown are:

[0025] Figure 1 A longitudinal sectional view of a filtration system assembled at a connection flange according to an embodiment of the invention, the filtration system being for a fluid, especially oil or fuel;

[0026] Figure 2 Shown according to Figure 1 an isometric sectional view of the filtration system; and

[0027] Figure 3 shows an exploded view of a filtration system according to Figure 1 together with a connecting flange. DETAILED DESCRIPTION

[0028] In the drawings, identical or similar components are denoted by the same reference numerals. The drawings show only examples and are not to be understood restrictively.

[0029] Figure 1 shows a longitudinal sectional view of a filtration system 100 assembled at a connecting flange 60 according to an embodiment of the present invention, which is used for fluids, in particular oil or fuel. Figure 2 shows an isometric sectional view of the filtration system 100, while in Figure 3 an exploded view of the filtration system 100 is shown.

[0030] The filtration system 100 can for example be used as an oil or fuel filter in an internal combustion vehicle or an electrically operated vehicle.

[0031] The filtration system 100 includes a can-shaped filter housing 10, which has a housing-fixed support tube 20 oriented along a longitudinal axis 80 and a filter element 40 arranged around the support tube 20. The filter element 40 can be pushed onto the support tube 20 and can be replaced in this way.

[0032] The support tube 20 is configured as a fluid penetration part, in particular as a fluid outlet 14. The open end 18 of the filter housing 10 also includes a fluid penetration part, in particular a fluid inlet 12 and a surrounding sealing element 30 arranged in a surrounding groove 32.

[0033] The support tube 20 has a thread 22 at its free end 38 facing away from the filter housing 10 for a threaded connection with the connecting flange 60. In addition, the support tube 20 has a plurality of penetration openings 24 for the particularly filtered fluid along the longitudinal extension of the support tube 20. The support tube 20 is integrally constructed with the filter housing 10. The thread 22 does not necessarily have to be constructed integrally with the support tube 20. In particular, in the case where the support tube 20 is made of plastic, the thread 22 is carried by an independent component, which is firmly, in particular non-loosely, connected to the support tube 20.

[0034] The filter element 40 has a filter medium body 42 closed at the end sides 44, 46 by end disks 48, 50. The end disks 48, 50 are configured here for radial sealing relative to the support tube 20. When the filter element 40 is properly assembled on the support tube 20, the end disks 48, 50 abut against the corresponding sealing surfaces 34, 36 of the support tube 20 and thus seal the filter element 40 relative to the support tube 20.

[0035] The filtration system 100 utilizes the thread 22 of the support tube 20 to be screwed into a mating thread 66 of an opening 64, which is configured as a fluid outlet, for example, of the connection flange 60. The surrounding sealing element 30 is pressed against the connection surface of the connection flange 60 and thus seals the filter housing 10 outwardly. Here, the end face 39 of the filter housing 10 is placed on the connection surface of the connection flange 60.

[0036] The sealing element 30 is configured to seal axially relative to the connection flange 60 and can be, for example, a molded seal, which is arranged in a surrounding groove 32 of the filter housing 10.

[0037] The connection flange 60 further has an opening 62 configured as a fluid inlet, which is fluidly connected to the fluid inlet 12 of the filtration system 100 when the filtration system 100 is screwed on. The fluid to be filtered flows through the fluid inlet 62 into the raw fluid region 52 and through the filter medium body 42 of the filter element 40. The filtered fluid flows through the penetration opening 24 of the support tube 20 into the clean fluid region 54 inside the support tube 20 and then flows out again through the fluid outlet 14 into the fluid outlet 64 of the connection flange 60.

[0038] The penetration opening 24 extends inclined to the longitudinal axis 80 in the direction of the open end 18 of the filter housing 10, so that the plastic housing 10, which is integrally formed with the support tube 20, can be advantageously demolded in an injection molding process. For this purpose, the filter housing 10 can also be advantageously configured conically with an increasing inner diameter towards the open end 18, which shows advantages for demolding in a plastic injection molding process.

[0039] However, alternatively, it is also feasible that the filter housing 10 is made of metal, especially configured as a die-cast part, especially configured as an aluminum die-cast part.

[0040] In Figure 2 the full-scale sectional view of the filtration system 100 in

[0041] it can be recognized that the filter housing 10 has radial reinforcing ribs 28 at its closed end 16. In this way, the filter housing 10, especially the filter housing 10 made of plastic, can be reinforced against higher fluid pressures in order to maintain its shape especially even in the case of higher temperatures.

[0042] In Figure 3The exploded view can identify the assembly sequence of several components of the filtration system 100.

[0043] The filter housing 10 includes a support tube 20 integrally constructed with the filter housing 10. The filter element 40 can be easily pushed onto the support tube 20 and then sealed relative to the support tube 20 at the sealing surfaces 34, 36 using its end discs 48, 50. The molded seal 30 is placed in the circumferential groove 32 at the open end 18 of the filter housing 10 and thus seals relative to the connection flange 60 when the filtration system 100 is screwed onto the connection flange 60 at the mating thread 66 of the opening 64.

[0044] Reference numerals:

[0045] 10 Filter housing

[0046] 12 Fluid inlet

[0047] 14 Fluid outlet

[0048] 16 Closed end

[0049] 18 Open end

[0050] 20 Support tube

[0051] 22 Thread

[0052] 24 Penetration opening

[0053] 26 Spiral profile

[0054] 28 Reinforcing rib

[0055] 30 Sealing element

[0056] 32 Groove

[0057] 34 Sealing surface

[0058] 36 Sealing surface

[0059] 38 End

[0060] 39 End face

[0061] 40 Filter element

[0062] 42 Filter medium body

[0063] 44 End side

[0064] 46 End side

[0065] 48 End disc

[0066] 50 End disc

[0067] 52 Original fluid area

[0068] 54 Clean fluid area

[0069] 60 Connecting flange

[0070] 62 Fluid inlet

[0071] 64 Fluid outlet

[0072] 66 Matching thread

[0073] 80 Longitudinal axis

[0074] 100 Filtration system.

Claims

1. A filter system (100) for a fluid, in particular oil, fuel or coolant, comprising at least a pot-shaped filter housing (10) having a housing-fixed support tube (20) oriented along a longitudinal axis (80) and a filter element (40) arranged around the support tube (20), in, The support tube (20) is designed as a fluid passage, in particular as a fluid outlet (14). The open end (18) of the filter housing (10) comprises a fluid passage, in particular a fluid inlet (12), and a surrounding sealing element (30) which, when properly assembled, serves to seal against a connecting flange (60). The support tube (20) has a thread (22) at its free end (38) facing away from the filter housing (10) for screw connection to the connecting flange (60) and has at least one through-opening (24) for a fluid, in particular a filtered fluid, along the longitudinal extension of the support tube (20). It is characterized in that The support tube (20) is formed integrally with the filter housing (10).

2. The filtration system according to claim 1, wherein: The filter element (40) has a filter medium body (42) at the end sides (44, 46) which is closed by end disks (48, 50), wherein at least one of the end disks (48, 50) is designed for radial sealing relative to the support tube (20).

3. The filtration system according to claim 1 or 2, wherein: The at least one through-opening (24) extends obliquely to the longitudinal axis (80) in the direction of an open end (18) of the filter housing (10).

4. A filtration system according to any one of the preceding claims, wherein: The sealing element (30) is designed to seal axially relative to the connecting flange (60).

5. A filtration system according to any one of the preceding claims, wherein: The sealing element (30) is designed as a molded seal which is arranged in a circumferential groove (32) of the filter housing (10).

6. A filtration system according to any one of the preceding claims, wherein: The filter housing (10) has at its closed end (16) a tool receptacle (26) which is open outward in an axial direction (80) and is in particular for a screwing tool.

7. The filtration system according to any one of claims 1 to 5, wherein: The filter housing (10) has at its closed end (16) a tool receptacle which is open radially outwards and is in particular for a replaceable filter release wrench.

8. A filtration system according to any one of the preceding claims, wherein: The filter element (40) is replaceably arranged around the support tube (20).

9. A filtration system according to any one of the preceding claims, wherein: The filter housing (10) consists of plastic, in particular the filter housing (10) is designed as a plastic injection-molded part.

10. The filtration system according to claim 9, wherein: The filter housing (10) is designed conically with an inner diameter which increases toward the open end (18).

11. The filtration system according to claim 9 or 10, wherein: The filter housing (10) has radial reinforcing ribs (28) at its closed end (16).

12. The filtration system according to any one of claims 1 to 8, wherein: The filter housing (10) consists of metal, in particular the filter housing (10) is designed as a die-cast part, in particular as an aluminum die-cast part.

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