Spin-on filters

Abstract

This utility model discloses a spin-on filter, which is installed in the engine oil circuit by screw rotation. The filter includes a filter element and a filter chamber. The filter element is located in the filter chamber, and includes an annular filter medium and a first end cap and a second end cap connected to both ends of the annular filter medium. The annular filter medium has a central cavity defined around its central axis. The filter chamber includes a shell and a cover. The cover has an inflow channel for oil to enter the filter chamber, and a positioning post is provided on the inner end face of the shell to restrict the movement of the filter element away from the cover. The filter also includes a riser connected to the cover. The riser has an outflow channel that fluid-sealedly communicates with the central cavity, and one end of the riser is configured to connect to the positioning post. This solution restricts the movement of the filter element through the cooperation of the riser and the positioning post, maintains the sealing at the connection between the filter element and the riser, and also improves the filter chamber's ability to withstand higher internal oil pressure impacts and resist oil pressure pulse fatigue, effectively extending the service life of the filter.

Description

Technical Field

[0001] This utility model belongs to the field of filter technology, and in particular relates to a filter that is installed in a car / truck engine by means of a threaded rotation. 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 fuel or lubricating oil. Known filters for filtering fuel in automobile / truck engines include a housing with an opening, a filter element disposed within the housing, and a cover for closing the opening. The fuel to be filtered flows from the fuel tank into the dirty side of the filter, then through the filter element to the clean side of the filter element, and finally into the engine.

[0003] In the above-mentioned type of filter, the filter element is usually attached to the riser on the housing or cover, and a spring is used to compress the filter element so that it is sealed to the riser through an elastic rubber seal. If the connection between the filter element and the riser is broken (such as spring failure), the sealing performance will be weakened, and fuel containing particulate matter will mix with clean fuel, resulting in the failure of the filtration function.

[0004] US Patent (Publication No.: US08083074B2) discloses a filter assembly including a housing and a nut plate, wherein a filter cartridge is disposed within an interior space of the housing, and a plurality of ribs are formed on the inner surface of the housing within the interior space; at least some of the ribs include positioning steps adjacent to a first end of the filter cartridge, the steps being spaced apart from the first end of the filter cartridge such that a gap exists between the steps and the first end of the filter cartridge, the steps being sized to engage with the first end to restrict movement of the filter cartridge away from the nut plate.

[0005] In some common sealing designs, after the filter cartridge is installed into the internal space of the housing, the housing and the nut plate are sealed by friction welding. Therefore, there is a gap between the step and the first end of the filter cartridge in the aforementioned patent. This prevents the step inside the housing from damaging the first end of the filter cartridge during rotational welding. However, the gap makes the filter cartridge unstable in the axial and radial directions. Especially when the size of the housing is large, the connection between the second end of the filter cartridge and the nut plate may move, causing the sealing effect to be compromised, thereby affecting the filtration function of the filter cartridge.

[0006] Furthermore, due to the absolute sealing of the outer shell after friction welding, the shell and nut plate, subjected to significant internal oil pressure over extended periods, will undergo outward expansion deformation. This deformation is exacerbated, especially during oil pumping, where repeated pressure fluctuations intensify the deformation, making them prone to fatigue damage. Combined with similar structural designs in existing technologies, particularly at the center of the bottom of the shell, the outward bulging deformation caused by internal liquid pressure will be even more severe. Utility Model Content

[0007] The main purpose of this utility model is to propose a spin-on filter, which aims to solve the technical problems of outward expansion and deformation of the filter element and easy movement at the connection between the filter element and the riser when the bottom of the housing is subjected to large internal oil pressure.

[0008] To achieve the above objectives, the present invention proposes a spin-on filter comprising a filter element and a filter chamber, wherein the filter element is located within the filter chamber, and wherein the filter element comprises an annular filter medium and a first end cap and a second end cap connected to both ends of the annular filter medium, and the annular filter medium has a central cavity defined around its central axis.

[0009] The filter chamber includes a housing and a cover. The cover has an inflow channel for oil to enter the filter chamber. The inner end face of the housing is provided with a positioning post to restrict the filter element from moving away from the cover.

[0010] It also includes a riser connected to the cover, the riser having a fluid-sealed outflow channel communicating with the central cavity, one end of which is configured to be connected to the positioning post.

[0011] Optionally, both the first end cap and the second end cap are provided with through holes for entering the central cavity, through which the riser passes and is connected to the positioning post.

[0012] Optionally, the end of the riser is connected to the positioning post by a thread.

[0013] Optionally, the through hole has a first hole wall that is generally distributed along the axial direction, and a portion of the outer wall of the positioning post is sealed to the through hole.

[0014] Optionally, the through hole is configured with an end face that forms a stop with the end of the positioning post.

[0015] Optionally, the inflow channel has an open end on the side away from the housing, and when the riser is connected to the positioning post, its pipe wall is configured to form a stop with the open end.

[0016] Optionally, the riser is provided with a first positioning rib distributed radially on the outside of its pipe wall, and the first positioning rib forms a stop with the open end.

[0017] Optionally, the riser is provided with a second positioning rib distributed radially on the outside of its wall to limit unexpected radial deviation of the riser.

[0018] Alternatively, the cover and the riser are two separate components.

[0019] Optionally, the outer surface of the housing or the cover is provided with connecting threads for rotating the filter chamber.

[0020] In the technical solution of this utility model, by connecting the riser with the oil outlet channel and the positioning column inside the housing, the riser can cooperate with the positioning column to restrict the movement of the filter element in the radial direction and away from the cover, thus maintaining the sealing of the connection between the filter element and the riser. At the same time, the connection structure between the riser and the positioning column also improves the filter chamber's ability to withstand higher internal oil pressure impacts and resist oil pressure pulse fatigue, effectively improving the service life of the filter. Attached Figure Description

[0021] 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.

[0022] Figure 1 This is a front view of an embodiment of the spin-on filter provided by this utility model in an oil circuit;

[0023] Figure 2 yes Figure 1 A cross-sectional view of the axial section of section AA;

[0024] Figure 3 This is a perspective structural diagram of an embodiment of the spin-on filter provided by this utility model;

[0025] Figure 4 yes Figure 3 Exploded view;

[0026] Figure 5 yes Figure 3 3D structural diagram of the middle filter element;

[0027] Figure 6 yes Figure 3 Three-dimensional structural diagram of the middle shell;

[0028] Figure 7 yes Figure 3 Another exploded view;

[0029] Figure 8 yes Figure 2 Flow path diagram of fuel oil.

[0030] Labeling Explanation: Spin-on Filter - 100, Filter Element - 10, Annular Filter Media - 11, Central Cavity - 11a, First End Cap - 12, Second End Cap - 13, Through Hole - 12a / 13a, First Hole Wall - 14, First Section - 14a, Second Section - 14b, End Face - 15, Second Hole Wall - 16, Support Tube - 17, Filter Chamber - 20, Inflow Channel - 20a, Outflow Channel - 20b, Housing - 21, Opening - 21a, Cover - 22, Positioning Post - 23, Inlet End - 24, Connecting Thread - 25, Internal Thread - 26, Limiting Rib - 27, Open End - 28, Riser - 30, Oil Hole - 30a, First Positioning Rib - 31, Second Positioning Rib - 32, Oil Head - 33, Reinforcing Rib - 34, External Thread - 35, O-ring Seal - 40.

[0031] 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

[0032] 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.

[0033] 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.

[0034] 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.

[0035] 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.

[0036] In some common sealing designs, after the filter cartridge is installed into the internal space of the housing, the housing and the nut plate are sealed by friction welding. For example, in patent US08083074B2, there is a gap between the step and the first end of the filter cartridge. This prevents the step inside the housing from damaging the first end of the filter cartridge during rotational welding. However, the gap makes the filter cartridge unstable in the axial and radial directions. Especially when the size of the housing is large, the connection between the second end of the filter cartridge and the nut plate may move, causing the sealing effect to be compromised, thus affecting the filtration function of the filter cartridge.

[0037] In view of this, the present invention provides a spin-on filter, which is mainly installed in the oil circuit of a car / truck engine by means of a threaded rotation. Figure 1-8 This is an embodiment of the spin-on filter provided by this utility model. Please refer to [link / reference]. Figure 1-8 The filter 100 includes a filter chamber 20 and a filter element 10 located within the filter chamber 20.

[0038] Please see Figure 1-3 The filter chamber 20 consists of a generally cylindrical shell 21 and a cup-shaped cover 22. An opening 21a is formed at one end of the shell 21, which is defined by an open end 28. The cover 22 is generally sealed to the open end 28 of the shell 21 by friction welding, thus forming a cavity for assembling the filter element 10. Typically, the shell 21 and / or the cover 22 are provided with a fuel inflow passage 20a and an outflow passage 20b. In this embodiment, the inflow passage 20a and the outflow passage 20b are defined by the cover 22 and the riser 30. The inflow passage 20a formed in the middle of the cover 22 can receive the oil to be filtered flowing in from the fuel tank, and the outflow passage 20b formed inside the riser 30 can guide the filtered oil to the engine system.

[0039] In a more detailed description, the housing 21 and cover 22 can be made of any material suitable for a particular application (e.g., metal) and manufactured in any suitable manner, such as by die casting and / or machining, as one or more pieces. In this embodiment, after the filter element 10 is installed inside the filter chamber 20, the housing 21 and cover 22 are manufactured as one piece by friction welding, achieving an absolute seal at the opening 21a, so that the entire filter 100 can be a separate product. Of course, in other embodiments, it can also be designed as a detachable structure, so that the filter element 10 can be disassembled and replaced after the cover 22 is removed from the housing 21.

[0040] Please see Figure 2 and 5The filter element 10 includes an annular filter medium 11 and a first end cap 12 and a second end cap 13 connected to both ends of the annular filter medium 11. Specifically, the annular filter medium 11 is generally cylindrical, and its interior has a cylindrical central cavity 11a formed around its central axis. The central cavity 11a (i.e., the inner side of the annular filter medium 11) and the outer side of the annular filter medium 11 respectively constitute the clean side and the dirt-collecting side of the fuel. In other embodiments, the central cavity 11a and the outer side of the annular filter medium 11 may also serve as the dirt-collecting side and the clean side of the fuel, respectively.

[0041] Similar to some common filter elements 10, the filter medium 11 in this embodiment can be made by repeatedly folding filter paper or bonding multiple layers of filter cloth. The first end cap 12 and the second end cap 13 are generally disc-shaped and are formed by injection molding from elastomeric materials or plastics. They can be connected to both ends of the annular filter medium 11 by means of hot melt welding, adhesive bonding, etc., to seal the central cavity 11a. It should be noted that the filter element 10 also includes a support tube 17 inside the central cavity 11a. The support tube 17 is hollow to allow fuel to pass through. Its two ends are connected to the first end cap 12 and the second end cap 13 to prevent the filter medium 11 from collapsing inward.

[0042] Please see Figure 2 and Figure 6 The bottom of the inner end face of the housing 21 is provided with axially distributed positioning posts 23. The ends of the positioning posts 23 are directly opposite the first end cap 12 of the filter element 10, thereby restricting the filter element 10 from moving away from the cap 22. In this embodiment, the positioning posts 23 are cylindrical, and their outer surfaces can be engaged with the structure of the first end cap 12, so that the filter element 10 can be initially installed into the housing 21. Then, by rotating the cap 22, the opening end 28 of the cap 22 and the housing 21 are friction-welded. After the welding is completed, the riser 30 is installed into the filter chamber 20.

[0043] The interior of riser 30 forms a clean fuel outflow channel 20b; please refer to [reference needed]. Figure 2 In this embodiment, the riser 30 is located in the inflow channel 20a formed by the cover 22. One end of the riser 30 is connected to the cover 22 and extends axially from this end toward the interior of the filter chamber 20, passing through the second end cover 13 of the filter element 10 and communicating with the central cavity 11a inside it. The pipe wall portion of the riser 30 located in the central cavity 11a is hollow, forming a plurality of oil passage holes 30a. The clean fuel in the central cavity 11a can enter the outflow channel 20b inside the riser 30 through each oil passage hole 30a.

[0044] After the housing 21 and cover 22 are friction welded, the filter element 10 inside the filter chamber 20 needs to be accurately positioned. Please refer to [link / reference needed]. Figure 2In this embodiment, the other end of the riser 30 also passes through the first end cap 12 and is then connected to the positioning post 23, thereby preventing radial movement of the filter element 10. It should be understood that the connection methods between the riser 30 and the positioning post 23 include threaded fit, snap-fit ​​fit, and interference fit. In this embodiment, a threaded fit is preferred, that is, an internal thread 26 is provided inside the positioning post 23, and an external thread 35 is provided at the end of the riser 30. When the riser 30 is rotated, the riser 30 and the positioning post 23 are connected, and the filter element 10 is installed around the riser 30. It is foreseeable that in other embodiments, an internal thread may also be provided at the end of the riser 30, and an external thread may be provided on the outer periphery of the positioning post 23.

[0045] In this technical solution, by connecting the riser 30 with the oil outlet channel and the positioning post 23 in the housing 21, the riser 30 can cooperate with the positioning post 23 to restrict the movement of the filter element 10 in the radial direction and away from the cover 22, thus maintaining the sealing of the connection between the filter element 10 and the riser 30. At the same time, the connection structure between the riser 30 and the positioning post 23 also improves the filter chamber 20's ability to withstand higher internal oil pressure impacts and resist oil pressure pulse fatigue, effectively improving the service life of the filter 100.

[0046] To ensure an effective seal at the connection between the riser 30 and the first end cap 12 and the second end cap 13, please refer to [link / reference needed]. Figure 4 and 5 Both the first end cap 12 and the second end cap 13 are provided with through holes 12a and 13a for entering the central cavity 11a, and the riser 30 can pass through the through hole 12a and connect to the positioning post 23.

[0047] Furthermore, to prevent leakage of clean fuel within the central cavity 11a and the outer side of the filter element 10 through the through-hole 12a, the through-hole 12a has a first hole wall 14 distributed generally along the axial direction. See also... Figure 5 The first hole wall 14 is divided into two sections. The first section 14a is for the riser 30 to enter, and the diameter of the hole in the first section 14a is slightly larger than the size of the end of the riser 30. The second section 14b is for the positioning post 23 to enter, and the diameter of the hole in the second section 14b is almost equal to the size of the positioning post 23.

[0048] Due to the threaded fit between the positioning post 23 and the end of the riser 30, the size of the end of the riser 30 is smaller than that of the positioning post 23. Therefore, the diameter of the hole in the first section 14a is smaller than that in the second section 14b.

[0049] To prevent fuel from passing through the through-hole 12a and weakening the filtration function, part of the outer wall of the positioning post 23 is sealed to the through-hole 12a. (See also...) Figure 2In this embodiment, the first hole wall 14 is elastic, which allows its first section 14a to be interference-fitted with a portion of the outer wall of the positioning post 23, thereby achieving radial sealing at the through hole 12a. Of course, the sealing connection between the first hole wall 14 and the positioning post 23 is not limited to this. In other embodiments, the outer walls of the first hole wall 14 and the positioning post 23 are connected by a sealing ring to achieve radial sealing.

[0050] It should be understood that the sealing connection is not limited to one of the above-mentioned locations. An end face 15 is formed at the connection between the first segment 14a and the second segment 14b of the first hole wall 14. This end face 15 forms a stop with the end of the positioning post 23. Especially under the pressure of the riser 30, this end face 15 is forced to tightly adhere to the end face 15 of the positioning post 23 to achieve axial sealing. It should be noted that radial sealing and axial sealing can be used individually or in combination. In this embodiment, the positioning post 23 only forms a radial sealing connection with the first hole wall 14.

[0051] In this embodiment, the end face 15 is a radially distributed annular surface. Of course, the shape of the end face 15 is not limited to this, and may also include a conical surface, a spherical surface, etc., to better contact the end face of the positioning post 23.

[0052] Please see Figure 2 The through hole 13a has a second hole wall 16 distributed generally along the axial direction, and a portion of the outer wall of the riser 30 is sealed to the second hole wall 16. In this embodiment, the second hole wall 16 is elastic, which allows it to be interference-fitted with a portion of the outer wall of the riser 30, thereby achieving a radial seal at the through hole 13a. Of course, the sealing connection method is not limited to this. In other embodiments, the first hole wall 14 and the outer wall of the positioning post 23 are connected by a sealing ring to achieve a radial seal.

[0053] In this embodiment, a fuel inflow channel 20a extending axially is formed in the middle of the cover 22. The inflow channel 20a is hollow cylindrical, and a portion of the riser 30 is located within the inflow channel 20a. Its wall separates the inflow channel 20a from the outflow channel 20b. (See fuel path for details.) Figure 8 Fuel containing particulate matter in the tank first enters the inflow channel 20a, then passes through the filter medium 11 and enters the central cavity 11a after filtration. Clean fuel enters the outflow channel 20b through the oil passage 30a of the riser 30, and finally leaves the filter chamber 20.

[0054] To achieve the connection between the riser 30 and the cover 22, an inlet end 24 is formed on the outer side of the cover 22 (that is, the side of the inflow channel 20a away from the housing 21), and the outer wall structure of the riser 30 and the inlet end 24 can form a stop or leave a gap.

[0055] Please see Figure 2-4The outer wall of the riser 30 has a first positioning rib 31, which is located near the oil head 33 (i.e., the oil outlet end) of the riser 30. The first positioning rib 31 is a thin plate integrally formed with the pipe wall. The thin plate is distributed roughly in the radial direction and has the ability to connect with the inlet end 24.

[0056] In this embodiment, the first hole wall 14 forms a radial sealing connection with the outer surface of the positioning post 23. When the external thread 35 of the far end of the riser 30 (that is, the end away from the oil head 33) is rotatably connected to the internal thread 26 of the positioning post 23, the first positioning rib 31 forms a stop with the inlet end 24, but the end face 15 does not form an axial stop with the end of the positioning post 23. There is a gap of less than 0.5mm between the two, that is, the filter element 10 and its first end cap 12 can move within the 0.5mm gap between the end face of the positioning post 23 and the end face of the riser 30.

[0057] As is well known, the filter chamber 20 will expand outwards under high internal oil pressure. In similar existing designs, the outward bulging deformation of the filter chamber 20, especially the middle part of the housing 21 (near the positioning post 23), due to internal liquid pressure is even more pronounced. In this embodiment, the riser 30 is threaded to the positioning post, and the first positioning rib 31 forms a stop with the open end 24. It is foreseeable that the riser 30 can effectively constrain the large deformation of the middle part of the housing 21 (near the positioning post 23), thereby improving the filter chamber 20, especially the housing 21,'s ability to withstand higher internal oil pressure impacts and resist oil pressure pulse fatigue.

[0058] In other embodiments, the first hole wall 14 does not form a radial sealing connection with the outer surface of the positioning post 23. When the external thread 35 of the far end of the riser 30 (i.e., the end away from the oil head 33) is rotatably connected to the internal thread 26 of the positioning post 23, there is a gap of less than 0.5 mm between the first positioning rib 31 and the inlet end 24. At this time, the end face 15 and the end of the positioning post 23 form a stop, achieving an axial sealing connection. The above two designs provide assembly error for the installation of the riser 30.

[0059] As mentioned earlier, the filter chamber 20 will expand outwards under high internal oil pressure. In this embodiment, the riser 30 is threaded to the positioning post, and the end face 15 forms a stop axial end face seal connection with the end of the positioning post 23. The first positioning rib 31 and the opening end 24 are provided with a gap of less than 0.5mm or a manufacturing assembly tolerance. It is foreseeable that the riser 30 can effectively constrain the large deformation of the middle part of the housing 21. In practical applications, it is still possible to obtain good results by constraining the deformation of the middle part of the housing 21 (near the positioning post 23) to within 0.5mm, thereby improving the ability of the filter chamber 20, especially the housing 21, to withstand higher internal oil pressure impacts and resist oil pressure pulse fatigue.

[0060] Please see Figure 2 In this embodiment, radially distributed limiting ribs 27 are constructed on the inner surface of the cover 22. Since the end face 15 does not abut against the end face 15 of the positioning post 23, the filter element 10 may move axially within the gap. The limiting ribs 27 can prevent the filter element 10 from moving towards the cover 22. The combination of the first positioning rib 31 and the limiting ribs 27 makes the positioning of the filter element 10 more stable.

[0061] Furthermore, to prevent radial movement between riser 30 and cover 22, please refer to... Figure 2-4 The riser 30 has radially distributed second positioning ribs 32 connected to its outer periphery. These second positioning ribs 32 abut against or have a very small gap from the inner wall of the inflow channel 20a, thereby preventing the riser 30 from shifting within the inflow channel 20a. There are four first positioning ribs 31 and four second positioning ribs 32, evenly distributed circumferentially along the riser 30. Each first positioning rib 31 and each second positioning rib 32 are connected together and extend approximately axially, thereby guiding the fuel flow in the inflow channel 20a.

[0062] Referring to Figures 2 and 5, it should be understood that, in this embodiment, to facilitate the friction welding of the filter chamber 20, the riser 30 and the cover 22 are connected as two separate components. If the housing 21 and the cover 22 of the filter chamber 20 are detachable structures, the riser 30 and the cover 22 can also be integrally molded by injection molding.

[0063] In order for the filter 100 to be installed in the fuel supply system of the engine, the outer surface of the housing 21 or the cover 22 is provided with connecting threads. In this embodiment, the outer peripheral surface of the cover 22 is provided with external threads, that is, connecting threads 25, which can form a threaded engagement with the fuel supply system structure, thereby fixing the entire filter 100 in the engine fuel supply system.

[0064] Furthermore, O-rings 40 are installed on the outer periphery of the cover 22 and the outer periphery of the oil head 33 of the riser 30 (i.e., the outlet of the outflow channel 20b). When the connecting thread 25 on the cover 22 is connected to the engine oil circuit, the O-rings 40 seal the connection.

[0065] When the connecting thread 25 corresponds to the internal thread in the engine oil passage, the O-ring 40 on the outer periphery of the oil nozzle 33 will press against the oil passage structure. To prevent the oil nozzle 33 from being squeezed and deformed, resulting in a poor seal, please refer to [the relevant documentation]. Figure 3 and 4 The oil head 33 of the riser 30 is also provided with reinforcing ribs 34, which are evenly distributed along the circumference to improve the rigidity of the riser 30 and prevent it from deforming.

[0066] The assembly process of the above-mentioned spin-on filter can be carried out in a semi-automatic or fully automatic manner. The assembly process of this embodiment specifically includes the following steps.

[0067] Step S10: Connect the filter element 10 to the positioning post 23 inside the housing 21.

[0068] In practice, the housing 21 is first fixed, and its opening 21a can face any position. In this embodiment, it is set to face upward. Then, the filter element 10 is moved to the top of the housing 21 and axially pressed down to put the filter element 10 into the interior of the housing 21 through the opening 21a. Axial pressure is continued to be provided to the filter element 10 so that the through hole 12a of its first end cap 12 is pressure connected to the positioning post 23 in the housing 21 and is interference-fitted with the first hole wall 14.

[0069] Step S20: Align the cover 22 with the opening end 28 of the housing 21 and perform friction welding.

[0070] In practice, the cover 22 is moved above the housing 21 and then moved axially to the opening end 28 of the housing 21. After the port of the cover 22 and the opening end 28 are aligned, the cover 22 is connected by a rotating drive device such as a motor and driven to rotate at high speed. At this time, the connection between the cover 22 and the housing 21 continues to rub and heat up, and then melts and connects into one piece.

[0071] Step S30: Extend the riser 30 axially into the inflow channel 20a.

[0072] In practice, the riser 30 is moved above the cover 22 and then axially into the inflow channel 20a of the housing 21.

[0073] Step S40: Continue to insert the riser 30 into the filter element 10 along the axial direction.

[0074] In practice, axial downward pressure causes the riser 30 to be inserted into the through hole 13a of the second end cap 13. The wall of the riser 30 is pressurized to the second hole wall 16, and axial pressure is continued to be provided to the riser 30. The end of the riser 30 begins to pass through the through hole 12a.

[0075] In step S50, the final riser 30 is connected to the filter element 10 and the positioning post 23.

[0076] In practice, the end of the riser 30 passes through the through hole 12a and abuts against the end of the positioning post 23, then stops pressing down. The riser 30 is connected by a rotating drive device such as a motor and driven to rotate slowly. At this time, the external thread 35 of the end of the riser 30 is screwed into the internal thread 26 of the positioning post 23, and the riser 30 moves downward until the first positioning rib 31 of the riser 30 abuts against the inlet end 24 of the cover 22, and the assembly is completed.

[0077] 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.

[0078] 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 spin-on filter, comprising a filter element (10) and a filter chamber (20), wherein the filter element (10) is located within the filter chamber (20), characterized in that: The filter element (10) includes an annular filter medium (11), a first end cap (12) and a second end cap (13) connected to both ends of the annular filter medium (11), and the annular filter medium (11) has a central cavity (11a) defined around its central axis. The filter chamber (20) includes a housing (21) and a cover (22). The cover (22) has an inflow channel (20a) for oil to enter the filter chamber (20). The inner end face of the housing (21) is provided with a positioning post (23) to restrict the filter element (10) from moving away from the cover (22). It also includes a riser (30) connected to the cover (22), the riser (30) having an outflow channel (20b) that is fluid-sealed in communication with the central cavity (11a), one end of which is configured to be connected to the positioning post (23).

2. The spin-on filter of claim 1, wherein, The first end cap (12) and the second end cap (13) are both provided with through holes (12a, 13a) for entering the central cavity (11a). The riser (30) passes through the through holes (12a, 13a) and is connected to the positioning post (23).

3. The spin-on filter of claim 1 or 2, wherein, The end of the riser (30) is connected to the positioning post (23) by a thread.

4. The spin-on filter of claim 2, wherein, The through hole (12a) has a first hole wall (14) that is generally distributed along the axial direction, and a portion of the outer wall of the positioning post (23) is sealed to the first hole wall (14).

5. The spin-on filter of claim 2, wherein, The through hole (12a) is constructed with an end face (15) that forms a stop with the end of the positioning post (23).

6. The spin-on filter of claim 1, wherein, The inflow channel (20a) forms an open end (24) on the side away from the housing (21), and when the riser (30) is connected to the positioning post (23), its pipe wall is configured to form a stop with the open end (24).

7. The spin-on filter of claim 6, wherein, The riser (30) has a first positioning rib (31) distributed radially on the outside of the pipe wall, and the first positioning rib (31) and the opening end (24) form a stop.

8. The spin-on filter of claim 1, wherein, The riser (30) is provided with a second positioning rib (32) distributed radially on the outside of the pipe wall to limit the riser (30) from unexpected radial deviation.

9. The spin-on filter of claim 1, wherein, The cover (22) and the riser (30) are two separate components.

10. The spin-on filter of claim 1, wherein, The outer surface of the housing (21) or the cover (22) is provided with connecting threads (25) for rotating the filter chamber (20).

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