Filter element and filter

Abstract

The filter element comprises an annular filter medium, a first end cover, a second end cover and a sealing piece, the first end cover and the second end cover are connected to the two ends of the annular filter medium, and the annular filter medium is provided with a central cavity arranged around the central axis of the annular filter medium; the first end cover is provided with a base extending outwards in the axial direction, the base defines a first opening entering the central cavity, and the end, away from the first end cover, of the base has a repeated and non-planar geometry. The sealing piece is continuously arranged on the periphery of the base in a surrounding mode, the sealing piece is detachably connected to the first end cover in a clamping fit mode, and the sealing piece is provided with an annular sealing part extending outwards in the axial direction. According to the technical scheme, the wave-shaped sealing piece connected to the outer wall of the base in the sleeving mode is replaced with the sealing piece arranged on the periphery of the base in the surrounding mode, the situation that the sealing piece deforms, twists, arches, even falls off and fails to assemble when the filter is assembled is avoided, and reliable installation is achieved.

Description

Technical Field

[0001] This utility model belongs to the field of filter technology, and in particular relates to a filter element and filter. Background Technology

[0002] Filters are used to filter fluids associated with the operation of internal combustion engines; for example, filters can remove particulate matter from fuels and lubricants. Some filters have separate seals that must be installed when assembling the filter element. For example, in conventional cartridge filters, the clean side of the filter media is typically sealed to the contaminated side of the filter media by a surface seal or radial seal.

[0003] To ensure proper functioning and leak-free operation of the filter element, its clean side must be properly sealed to the oil outlet of the filter housing. Typically, hydraulic filter elements use planar-supported O-rings with straight-cut or radial sealing gland designs; or they use non-planar-supported seals with a wavy, non-planar geometry, such as the "Wave-Gland Seal Filter Element" disclosed in US Patent No. 13305894. This design features a wavy groove along the radial outer surface of the body and a non-planar geometry seal at the distal outer end of the filter element end cap, allowing for quick engagement between the filter element end cap and the assembly socket during filter element installation.

[0004] However, O-ring or corrugated seals are difficult to fit tightly when assembled into corrugated grooves. As a result, when the filter element is assembled into the assembly, the seal is prone to deformation and arching as it goes from being partially squeezed by the assembly matching parts to achieving a complete seal with all the assembly matching parts. This can lead to assembly failure or poor sealing after assembly. Utility Model Content

[0005] The main purpose of this utility model is to propose a filter element and filter to solve the technical problem that corrugated seals are prone to popping out and arching during assembly, leading to assembly failure.

[0006] To achieve the above objectives, the filter element proposed in this utility model includes:

[0007] An annular filter medium having a central cavity defined around its central axis;

[0008] A first end cap and a second end cap are connected to both ends of the annular filter medium. The first end cap has a base extending axially outward, the base defining a first opening into the central cavity, and its end away from the first end cap has a repeating and non-planar geometry; and,

[0009] A sealing element is disposed around the outer periphery of the base. The sealing element is detachably connected to the first end cap by a snap-fit ​​engagement and has an annular sealing portion extending outward along the axial direction.

[0010] Optionally, the first end cap is provided with at least one bayonet, and the sealing member is provided with at least one locking block, the locking block having a head and a neck, the neck being engaged within the bayonet.

[0011] Optionally, the inner wall of the annular seal protrudes radially inward to form a sealing lip for radially sealing the internal components of the filter assembly.

[0012] Optionally, the sealing lip has a continuous annular structure.

[0013] Optionally, a conical surface is formed between the end of the annular sealing portion away from the first end cap and the annular sealing lip.

[0014] Optionally, the sealing lip has a continuous, repeating corrugated structure.

[0015] Optionally, a conical surface is formed between the end of the annular seal away from the first end cap and the corrugated sealing lip.

[0016] Optionally, the end of the base includes a plurality of protrusions evenly distributed circumferentially, and a groove extending inward along the axial direction between two adjacent protrusions.

[0017] Optionally, the outer edge of the protrusion has a highest point and a lowest point in the axial direction, with a generally arc-shaped transition between the highest point and the lowest point.

[0018] This utility model also proposes another filter element, which includes:

[0019] An annular filter medium having a central cavity defined around its central axis;

[0020] A first end cap and a second end cap are connected to both ends of the annular filter medium. The first end cap has a base extending axially outward, the base defining a first opening into the central cavity, and its end away from the first end cap has a repeating and non-planar geometry; and,

[0021] A sealing element is disposed around the outer periphery of the base. The sealing element is connected to the first end cap by means of adhesive bonding, injection molding, or vulcanization molding, and has an annular sealing portion extending outward along the axial direction.

[0022] Optionally, the annular sealing portion is disposed at a distance from the base, and the inner wall of the annular sealing portion protrudes radially inward to form a sealing lip for radially sealing the internal components of the filter assembly.

[0023] Optionally, the sealing lip has a continuous annular structure.

[0024] Optionally, the sealing lip has a continuous, undulating corrugated structure.

[0025] Optionally, a conical surface is formed between the end of the annular seal away from the first end cap and the sealing lip.

[0026] This utility model also proposes a filter, including a housing and a cover detachably connected to the housing, and also includes a filter element as described above;

[0027] The cover has a socket extending outward along the axial direction, the inner contour of the socket defining a second opening for entering the oil outlet channel, the inner contour of the socket closely fitting the outer contour of the base, and the outer wall of the socket closely fitting the seal.

[0028] Optionally, the internal profile of the socket includes a seat whose shape matches the geometry of the end of the base, such that the end of the base engages the seat of the socket face-to-face.

[0029] In this invention, by replacing the corrugated seal fitted onto the outer wall of the base with a seal arranged around the outer periphery of the base, the annular sealing portion prevents deformation, twisting, arching, or even detachment and assembly failure of the seal during filter assembly, thus achieving reliable installation. Furthermore, the seal in this design exhibits better sealing performance under inward oil pressure, especially axial oil pressure, which ensures a good seal between the seal and the filter components. Attached Figure Description

[0030] To more clearly illustrate the technical solutions in the embodiments of this utility model or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on the structures shown in these drawings without creative effort.

[0031] Figure 1 This is a three-dimensional structural diagram of an embodiment of the filter element provided by this utility model;

[0032] Figure 2 yes Figure 1 3D structural diagram of the central sealing component;

[0033] Figure 3 yes Figure 2 A three-dimensional structural diagram of another embodiment;

[0034] Figure 4 yes Figure 2 The front view;

[0035] Figure 5 yes Figure 1 A three-dimensional view of the middle section structure;

[0036] Figure 6 yes Figure 1 A perspective view of another embodiment of the first end cap;

[0037] Figure 7 This is a perspective structural diagram of an embodiment of the filter provided by this utility model;

[0038] Figure 8 yes Figure 7 3D structural diagram of the center cap;

[0039] Figure 9 yes Figure 7 Top view;

[0040] Figure 10 yes Figure 9 A sectional view of section BB in the middle.

[0041] Labeling Explanation: Filter-1000, Filter Element-100, Filter Media-1, Central Cavity-1a, First End Cap-2, First Opening-2a, Bayonet-2b, Base-21, End-211, Protrusion-2111, Groove-2112, Positioning Block-212, Second End Cap-3, Third Opening-3a, Seal-4, Locking Block-41, Head-411, Neck-412, Sealing Lip-42A / 42B, Conical Surface-43, Annular Seal-44, Skeleton-5, Water-Blocking Medium-6, Housing-200, Drainage Channel-200a, Cover-300, Oil Outlet Channel-300a, Socket-301, Second Opening-301a, Seat-3011, Positioning Groove-3012.

[0042] The realization of the purpose, functional features and advantages of this utility model will be further explained in conjunction with the embodiments and with reference to the accompanying drawings. Detailed Implementation

[0043] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0044] To better describe and illustrate the embodiments of this application, reference may be made to one or more accompanying drawings, but the additional details or examples used to describe the drawings should not be considered as limiting the scope of any of the utility model creation, the embodiments or preferred embodiments of this application, or the preferred methods described herein.

[0045] In the description of this utility model, it should be noted that the terms "length", "width", "upper", "lower", "front", "rear", "left", "right", "top", "bottom", "inner", and "outer" indicate the orientation or positional relationship based on the positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and do not indicate that the device referred to must have a specific orientation or operate in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0046] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the application.

[0047] The "wave-shaped gland-sealed filter element" disclosed in US Patent No. 13305894 features a wave-shaped groove and a non-planar geometry seal along the radial outer surface of the filter element's end cap at its distal outer end. This allows for rapid engagement between the filter element end cap and the assembly socket during filter element installation. However, O-ring or wave-shaped seals are difficult to fit tightly into the wave-shaped groove during assembly. Consequently, during filter element assembly, the seal can easily deform and arch as it moves from partial contact with the assembly sealing hole to complete sealing, leading to assembly failure or poor sealing after assembly.

[0048] In view of this, the present invention provides a filter element and a filter. Figure 7-10 An embodiment of the filter provided by this utility model. Please refer to [link / reference]. Figure 7-10 The filter 1000 consists of a housing 200, a cover 300 detachably connected to the housing 200, and a filter element 100, which is installed inside the housing 200.

[0049] The cap 300 is typically connected to the open end of the housing 200 via a threaded connection, thus forming a cavity for filtering oil. Generally, the housing 200 and / or the cap 300 are equipped with an oil inlet channel and an oil outlet channel 300a. In this embodiment, the oil inlet channel is located on the housing 200 and can receive the oil to be filtered flowing from the oil tank; the oil outlet channel 300a is located on the cap 300 and can guide the filtered oil to the engine system.

[0050] In a more detailed description, the housing 200 and the cover 300 may be made of any material suitable for a particular application (e.g., metal) in any appropriate manner, such as by die casting and / or machining.

[0051] Figure 1 An embodiment of the filter element provided by this utility model. Please refer to [link / reference]. Figure 1 The filter element 100 includes an annular filter medium 1 and a first end cap 2 and a second end cap 3 connected to both ends of the annular filter medium 1.

[0052] Specifically, the annular filter medium 1 is generally cylindrical, with a central cavity 1a formed around its central axis. The central cavity 1a and the outer side of the filter medium 1 constitute the clean side and the dirt-receiving side, respectively. Similar to some common filter cartridges, the filter medium 1 in this embodiment can be made by repeatedly folding filter paper or bonding multiple layers of filter cloth.

[0053] The first end cap 2 and the second end cap 3 are generally disc-shaped and can be connected to both ends of the annular filter medium 1 by means of hot-melt welding, adhesive bonding, etc. A base 21 is integrally formed at the center of the first end cap 2. The base 21 is tubular, with its main body extending axially outward from the outer end face of the first end cap 2. A first opening 2a is formed at the end 211 furthest from the first end cap 2, connecting to the central cavity 1a. This end 211 (i.e., the far end furthest from the first end cap 2) has a repeating and non-planar geometry, continuously distributed in a corrugated pattern around its circumference, allowing it to engage with the seat 3011 of the cap 300, enabling the base 21 to be embedded in the oil outlet of the cap 300.

[0054] The seal 4 has a generally continuous annular structure and is detachably connected to the first end cap 2 by a snap-fit ​​connection. Similar to the base 21, the seal 4 has an annular sealing portion 44 formed by extending axially outward from the outer end face of the first end cap 2. The seal 4 and its annular sealing portion 44 are arranged around the outer periphery of the base 21. A sealing space is formed between the seal 4 and the base 21, particularly between the annular sealing portion 44 and the base 21, to seal the oil outlet of the cap 300 and the contaminant side of the filter medium 1, thus ensuring the smooth passage of clean oil through the oil outlet.

[0055] Of course, the embodiments of this utility model are not limited to this. The sealing member 4 and the first end cap 2 are non-removable and have the following connection methods:

[0056] Method 1: Attach the seal 4 to the first end cap 2 by applying adhesive, such as... Figure 6 Apply glue to the contact surfaces of the two surfaces.

[0057] Method 2: The sealing element 4 is molded onto the first end cap 2 in an integral manner through one-piece injection molding to form an integral structure.

[0058] Method 3: Based on the material properties of the seal 4, the seal 4 is formed on the first end cap 2 through a heating and vulcanization process to form an integral structure.

[0059] Please see Figure 9 The base 21 and seal 4 on the first end cap 2 correspond to the oil outlet channel 300a on the cover 300. Similar to the covers of most filters 1000, the cover 300 has a socket 301 or post extending outward along the axial direction for connecting to the central cavity 1a of the filter element 100. In this embodiment, the inner contour of the socket 301 forms a second opening 301a for entering the oil outlet channel 300a. This second opening 301a corresponds to the first opening 2a on the base 21, and the inner contour of the socket 301 can fit tightly with the outer contour of the base 21, thereby connecting the central cavity 1a and the oil outlet channel 300a.

[0060] Specifically, please refer to Figure 7 The inner contour (i.e., inner wall) of the socket 301 includes a seat 3011, which has a repeating, corrugated geometry that adapts to and matches the end 211 of the base 21. Compared with the flat end 211, this geometry enables quick engagement with the end 211 of the base 21 in a face-to-face manner, and the interface is more seamless.

[0061] The outer contour (i.e., outer wall) of the socket 301 can also achieve a tight fit with the seal 4. The socket 301 has a certain wall thickness, and when it engages with the end 211 of the base 21, its outer wall also engages with the inner wall of the annular sealing portion 44 of the seal 4. Furthermore, under the action of compression, the seal 4 and the socket 301 achieve a sealed connection.

[0062] In the above technical solution, by replacing the corrugated seal 4 sleeved on the outer wall of the base 21 with a seal 4 that is installed around the outer periphery of the base 21, the annular seal 4 and the first end cap 2 are stably connected, and the annular sealing part 44 is spaced apart from the base 21, the cover 300 is prevented from squeezing the seal 4 during the assembly of the filter 1000, causing it to deform, twist, arch, or even fall off, resulting in a poor sealing effect.

[0063] Furthermore, under inward oil pressure, the seal 4 in this technical solution can fit more tightly against the internal components of the filter 1000 top cover and the outer end face of the first end cover 2, resulting in better sealing. In particular, the axial oil pressure ensures a good seal between the seal 4 and the cover 300.

[0064] There are several ways in which the seal 4 and the first end cap 2 can be engaged. For easy disassembly of the seal 4, please refer to [link / reference needed]. Figure 2 , 4 In one embodiment of this utility model, the first end cap 2 has three slots 2b evenly arranged along the circumference of the base 21. The end of the sealing member 4 near the first end cap 2 has a base extending radially. The base has three locking blocks 41 corresponding to the slots 2b. Each locking block 41 has a head 411 and a neck 412. The neck 412 of the locking block 41 is locked in the slot 2b, so that the sealing member 4 and the first end cap 2 are engaged. In addition, the extending directions of the locking blocks 41 and the slots 2b are consistent. In this embodiment, they both extend axially.

[0065] It should be understood that the seal 4 should be made of an elastic material, preferably an elastomer, which allows the locking block 41 to deform and engage with the locking slot 2b. Simultaneously, the elastic seal 4 can achieve a good tight fit under inward oil pressure.

[0066] To ensure a tight fit between the inner wall of seal 4 and cap 300, please refer to [link / reference needed]. Figure 2 and 3 In one embodiment of the present invention, the inner wall of the sealing member 4 protrudes radially inward to form a sealing lip 42A / 42B. The sealing lip 42 can seal the socket 301 of the cover 300 in the radial direction, that is, it can fit tightly against the outer wall of the socket 301.

[0067] The sealing lip can have various shapes and designs; please refer to [link / reference]. Figure 2 In one embodiment of this utility model, the sealing lip 42A has a continuous annular structure, which can be configured as one or more. Since the sealing lip 42A and the annular sealing part 44 are integrally constructed, the sealing lip 42A is supported by the annular sealing part 44 during installation, preventing abnormal deformation damage or detachment, thus improving the reliability of installation.

[0068] Please see Figure 3 In another embodiment, the radially inwardly protruding sealing lip 42B on the inner wall of the seal 4 forms a continuous, undulating corrugated structure. This corrugated structure is similar to the end 211 of the base 21. When in contact with the socket 301 of the cover 300, by extending its sealing contact portion, the impact of the cleaning oil in the central cavity 1a on the sealing contact portion per unit area is minimized when passing through the first opening 2a, thereby forming a better sealing effect. Similarly, since the sealing lip 42B is integrally constructed with the annular sealing portion 44 and is supported by the annular sealing portion 44, the sealing lip 42B will not suffer abnormal deformation damage or fall off during installation, improving the reliability of installation.

[0069] The corrugated sealing lip 42B and the end 211 of the base 21 have corrugated shapes that correspond in the circumferential direction. That is, the crests and troughs of both have the same curvature in the circumferential direction. This corresponding installation method further reduces leakage from the sealing contact area per unit area.

[0070] In order to enable the installation of the seal 4 at the end 211, in some embodiments, the snap 2b of the first end cover 2 can be set to different shapes, and the shape of the snap block 41 of the seal 4 can also be changed accordingly. This method limits the installation position of the seal 4, thereby ensuring that the corrugated shape of its sealing lip 42B corresponds to the corrugated shape of the end 211.

[0071] Additionally, for easier installation and mating of the seal 4 and socket 301, please refer to [link / reference needed]. Figure 2 and 3 In one embodiment of this invention, the end of the seal 4 furthest from the first end cap 2, i.e., the distal end of the annular sealing portion 44, forms a conical surface 43 on the inner wall between it and the sealing lips 42A / 42B, causing the thickness to continuously increase from this distal end to the sealing lip 42. When the socket 301 of the cover 300 is inserted between the seal 4 and the base 21, the conical surface 43 provides a guiding function, facilitating the insertion of the socket 301 and its tight fit with the sealing lips 42A / 42B. This arrangement is beneficial for installation guidance.

[0072] The geometry of the end 211 of the base 21 is able to form a good seal with the socket 301 of the cover 300. Please refer to [link / reference]. Figure 1 and 5 In one embodiment of this utility model, the geometry of the end 211 includes two circumferentially evenly distributed protrusions 2111. Compared with a flat end 211, this geometry enables quick engagement with the socket 301, and even when the filter medium 1 is blocked or the pressure differential is high, a strong positive seal can be formed between the end cap of the base 21 and the socket 301.

[0073] To make the end 211 of the base 21 generally corrugated, please refer to Figure 5 In one embodiment of the present invention, the outer edge of the protrusion 2111 has a highest point and a lowest point in the axial direction, and the transition between the highest point and the lowest point is generally arc-shaped, for example, generally sinusoidal, repeating around the circumference of the base 21.

[0074] Please see Figure 1 and 5 The groove 2112 formed between two adjacent protrusions 2111 extends inward along the axis and matches the shape on the seat 3011 of the socket 301, which can further play a guiding role.

[0075] It should be noted that two such protrusions 2111 are shown in the figure, but the number, spacing and geometry of the protrusions 2111 can be varied, as can the geometry of the groove 2112.

[0076] To further enable quick alignment of the base 21 and the socket 301, please refer to Figure 1 and 8 The outer wall of the base 21 is integrally provided with two positioning blocks that extend radially outward. The two positioning blocks are symmetrically arranged. The inner contour of the socket 301 includes a positioning groove 3012 that can cooperate with the positioning block 212. When the positioning block 212 enters the positioning groove 3012, the end 211 of the base 21 also engages with the seat 3011.

[0077] Additionally, the end face of socket 301 is divided into two parts; please refer to [link / reference]. Figure 8 The end face consists of two inclined surfaces with the same inclination direction. Two positioning grooves 3012 are set at the junction of the two inclined surfaces, with the lowest point of one inclined surface close to the highest point of the other, and the highest point close to the lowest point of the other. With this design, when the base 21 and the socket 301 are aligned, the positioning block 212 can slide on the inclined surface. Simply rotating the cover 300 clockwise will slide the positioning block 212 into the positioning groove 3012, avoiding errors in alignment by the operator that could lead to structural damage.

[0078] Please see Figure 10 In one embodiment of the present invention, the filter element 100 further includes a skeleton 5 in the central cavity 1a and a water-blocking medium 6 fixed on the skeleton 5. The two ends of the skeleton 5 are connected to the first end cap 2 and the second end cap 3. The water-blocking medium 6 can separate water in the oil and deposit it at the bottom of the central cavity 1a in the filter element 100.

[0079] Furthermore, a third opening 3a is provided at the center of the second end cap 3, and a drainage channel 200a is provided at the bottom of the housing 200. The drainage channel 200a is connected to the central cavity 1a through the third opening 3a to discharge the deposited water into the water accumulation cavity.

[0080] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0081] The above embodiments merely illustrate several implementation methods of this application, and their descriptions are relatively specific and detailed. However, they should not be construed as limiting the scope of the utility model patent. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this application, and these all fall within the protection scope of this application. Therefore, the protection scope of this patent application should be determined by the appended claims.

Claims

1. A filter cartridge (100) characterized by, The filter element comprises: a ring-shaped filter medium (1) having a central cavity (1a) defined about a central axis thereof; a first end cap (2) and a second end cap (3) connected to two ends of the ring-shaped filter medium (1), the first end cap (2) having a base (21) extending axially outward, the base (21) defining a first opening (2a) into the central cavity (1a), an end portion (211) of the first end cap (2) away from the first end cap (2) having a repeated and non-planar geometry; and a seal (4) circumferentially disposed at an outer periphery of the base (21), the seal (4) being detachably connected to the first end cap (2) by a snap-fit manner, and having an annular sealing portion (44) extending axially outward.

2. The filter cartridge (100) of claim 1, wherein, The first end cap (2) is provided with at least one snap opening (2b), and the seal (4) is provided with at least one snap block (41) having a head portion (411) and a neck portion (412), the neck portion (412) being snap-fitted into the snap opening (2b).

3. The filter cartridge (100) of claim 1, wherein, The annular sealing portion (44) is disposed away from the base (21), and an inner wall of the annular sealing portion (44) protrudes radially inward to form a sealing lip (42A; 42B) for radially sealing an internal component of a filter assembly.

4. The filter cartridge (100) of claim 3, wherein, The sealing lip (42A) has a continuous annular configuration.

5. The filter cartridge (100) of claim 3, wherein, The sealing lip (42B) has a continuous and undulating corrugated configuration.

6. The filter cartridge (100) of claim 3, wherein, A taper surface (43) is formed between the end portion of the annular sealing portion (44) away from the first end cap (2) and the sealing lip (42A, 42B).

7. The filter cartridge (100) of claim 1, wherein, The end portion (211) comprises a plurality of protrusions (2111) uniformly distributed in a circumferential direction, and an axially inwardly extending groove (2112) is formed between two adjacent protrusions (2111).

8. A filter cartridge, characterized by The filter element comprises: a ring-shaped filter medium having a central cavity defined about a central axis thereof; a first end cap and a second end cap connected to two ends of the ring-shaped filter medium, the first end cap having a base extending axially outward, the base defining a first opening into the central cavity, an end portion of the first end cap away from the first end cap having a repeated and non-planar geometry; and a seal circumferentially disposed at an outer periphery of the base, the seal being connected to the first end cap by a gluing, injection molding or vulcanization forming manner, and having an annular sealing portion extending axially outward.

9. The filter cartridge of claim 8 wherein, The annular sealing portion is disposed away from the base, and an inner wall of the annular sealing portion protrudes radially inward to form a sealing lip for radially sealing an internal component of a filter assembly.

10. The filter cartridge of claim 9 wherein, The sealing lip has a continuous annular configuration.

11. The filter cartridge of claim 9 wherein, The sealing lip has a continuous and undulating corrugated configuration.

12. The filter cartridge of claim 9 wherein, A taper surface is formed between the end portion of the annular sealing portion away from the first end cap and the sealing lip.

13. A filter comprising a housing (200) and a cover (300) detachably connected to the housing (200), characterized in that, Also included is the filter element of any one of claims 1-12; In which the cover (300) has a socket (301) extending axially outwards, the internal profile of the socket (301) defining a second opening (301a) into the oil outlet channel (300a), the internal profile of the socket (301) fitting tightly with the outer profile of the base, the outer wall of the socket (301) fitting tightly with the seal (4).

14. The filter of claim 13, wherein The internal profile of the socket (301) comprises a seat (3011) shaped to match the geometry of the end (211) of the base, so that the end of the base engages the seat (3011) of the socket (301) in face-to-face manner.

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