Oil filter

Abstract

The utility model discloses an engine oil filter which comprises a main body assembly and a pressure relief structure. The main body assembly is provided with an oil inlet hole, an oil inlet cavity, an oil outlet cavity and an oil outlet hole, the oil inlet hole is communicated with the oil inlet cavity, a filtering structure for separating the oil outlet cavity and the oil inlet cavity is arranged between the oil outlet cavity and the oil inlet cavity, the oil outlet hole is communicated with the oil outlet cavity, and the main body assembly is further provided with a pressure relief hole for communicating the oil inlet cavity and the oil outlet cavity. The pressure relief structure is arranged on the main body assembly and comprises a sealing plug and a pressure relief elastic piece, the sealing plug is movably arranged and can seal and open the pressure relief hole, and the pressure relief elastic piece is used for enabling the sealing plug to have the tendency of being kept at the sealing position. Wherein the sealing plug is provided with a magnet or the sealing plug has magnetism. According to the engine oil filter, backflow of ferromagnetic impurities can be better reduced during pressure relief, meanwhile, the occupied internal space is small, and the influence on normal flowing of engine oil is small.

Description

Technical Field

[0001] The utility model relates to automotive supplies, in particular to an oil filter. Background Art

[0002] The oil filter is used to filter the engine oil to reduce the wear of impurities on the engine. Some oil filters are also provided with a pressure relief structure. When the filtering structure of the oil filter is blocked, the oil can be drained through the pressure relief structure, so as to ensure the normal supply of the oil. Some oil filters are also provided with magnets to assist in adsorbing ferromagnetic impurities such as iron powder. A common way to add a magnet is to use a magnetic ring belt, and the magnetic ring belt is sleeved and fixed on the outer periphery of the oil filter to achieve impurity adsorption. However, the socket of the magnetic ring belt is not stable, and there is a risk of fracture or detachment. For this reason, there is currently also a solution to add a magnet inside the oil filter, such as attaching and fixing the magnet to the inner side of the outer shell, or installing the magnet on the filter element and so on. However, in the above solutions, when the pressure relief structure relieves pressure, the rapidly flowing oil during pressure relief may still mix ferromagnetic impurities into the pressure-relieved oil, resulting in the backflow of impurities. In addition, the magnets at the above installation positions also occupy a certain internal space and are likely to affect the normal flow of the oil. Summary of the Utility Model

[0003] The utility model aims to at least solve one of the technical problems existing in the prior art. For this reason, the utility model provides an oil filter, which can better reduce the backflow of ferromagnetic impurities during pressure relief, while occupying less internal space and having little influence on the normal flow of the oil.

[0004] The oil filter according to an embodiment of the utility model includes: a main body assembly, provided with an oil inlet hole, an oil inlet cavity, an oil outlet cavity and an oil outlet hole, the oil inlet hole is communicated with the oil inlet cavity, a filtering structure for separating the two is arranged between the oil outlet cavity and the oil inlet cavity, the oil outlet hole is communicated with the oil outlet cavity, and the main body assembly is also provided with a pressure relief hole for communicating the oil inlet cavity and the oil outlet cavity; a pressure relief structure, arranged on the main body assembly, the pressure relief structure includes a plug and a pressure relief elastic member, the plug is movably arranged and can block and open the pressure relief hole, and the pressure relief elastic member is used to make the plug have a tendency to stay in the blocking position; wherein, the plug is provided with a magnet or the plug itself has magnetism.

[0005] The oil filter according to the embodiments of the present utility model has at least the following beneficial effects: By providing a magnet on the plug of the pressure relief structure or using a plug with inherent magnetism, compared with providing a magnet at other positions, on the one hand, since the oil for pressure relief will all pass through the plug, it effectively ensures the adsorption of impurities in the oil for pressure relief; on the other hand, since the plug itself is a component of the oil filter, setting it to have magnetism or providing a magnet on it occupies less internal space and has little impact on the normal flow of the oil.

[0006] According to some embodiments of the present utility model, the plug is provided with a magnet and the magnet is embedded in the plug.

[0007] According to some embodiments of the present utility model, the plug is provided with a plugging surface for plugging and opening the pressure relief hole, an embedding groove is formed on the plugging surface, and the magnet is installed in the embedding groove.

[0008] According to some embodiments of the present utility model, the magnet is within the projection range of the pressure relief hole along the hole axis direction.

[0009] According to some embodiments of the present utility model, the magnet is circular, the pressure relief hole is a round hole, and the diameter of the magnet is less than or equal to the diameter of the pressure relief hole.

[0010] According to some embodiments of the present utility model, the plug is arranged on the side of the pressure relief hole close to the oil outlet cavity, the pressure relief elastic member presses against the side of the plug away from the pressure relief hole, and the pressure relief elastic member is in a compressed state.

[0011] According to some embodiments of the present utility model, the pressure relief structure further includes a mounting bracket, the mounting bracket is arranged in the oil outlet cavity and one end is fixed to the peripheral side of the hole of the pressure relief hole, the mounting bracket is provided with a mounting cavity, the other end of the mounting bracket is provided with an abutting portion, the plug is movably arranged on the mounting bracket and can move in the direction close to and away from the pressure relief hole, the pressure relief elastic member is arranged in the mounting cavity and is located between the plug and the abutting portion, and both ends of the pressure relief elastic member respectively press against the plug and the abutting portion.

[0012] According to some embodiments of the present utility model, the mounting bracket is an integrally formed sheet metal part, the mounting bracket includes a base shell part and at least two connecting plate parts, the base shell part is fixed to the peripheral side of the hole of the pressure relief hole, one end of the connecting plate part is connected to the base shell part, the mounting cavity is formed by enclosing between the connecting plate parts, and the abutting portion is arranged at the other end of the connecting plate part and is the extended and bent part of the other end of the connecting plate part.

[0013] According to some embodiments of the present utility model, the main body assembly includes a housing and a filter element. The filter element is disposed within the housing. The filter element includes an upper end cap, a central support cylinder, a lower end cap, and the filtering structure. The upper and lower ends of the central support cylinder are respectively connected to the upper end cap and the lower end cap. A plurality of communication holes communicating the inside and outside thereof are formed on the circumferential surface of the central support cylinder. The filtering structure is a filter paper cylinder, and the filter paper cylinder is sleeved on the outer periphery of the central support cylinder. The upper and lower ends of the filter paper cylinder are respectively connected to the upper end cap and the lower end cap. An oil outlet cavity is formed by enclosing between the filter paper cylinder, the upper end cap, and the lower end cap. An oil inlet cavity is formed between the filter element and the inner side wall of the housing. The oil inlet hole and the oil outlet hole are formed on the housing. The lower end cap is provided with a docking hole communicating with the oil outlet cavity, and the oil outlet hole is docked with the docking hole. The pressure relief hole is formed on the upper end cap, and the pressure relief structure is disposed on the upper end cap.

[0014] According to some embodiments of the present utility model, the lower end cap is provided with a first convex cylinder portion extending downward, and the docking hole is the inner hole of the first convex cylinder portion. The housing includes a cover shell and an end shell. The end shell is connected to one end of the cover shell. The oil inlet hole and the oil outlet hole are formed on the end shell. A second convex cylinder portion extending upward is provided on the inner side of the end shell, and the oil outlet hole is the inner hole of the second convex cylinder portion. The lower end of the first convex cylinder portion and the upper end of the second convex cylinder portion are mutually docked, and a sealing sleeve is sleeved on the outer periphery of both. A plurality of oil inlet holes are provided and arranged around the oil outlet hole. An annular and elastically deformable one-way diaphragm is integrally formed on the outer periphery of the sealing sleeve, and the one-way diaphragm covers the oil inlet hole. The outer peripheral edge of the one-way diaphragm can be attached to the inner side surface of the end shell. A filter element elastic member for pushing the filter element toward the end shell is provided between the filter element and the housing.

[0015] Additional aspects and advantages of the present utility model will be given in part in the following description, become apparent in part from the following description, or be understood through the practice of the present utility model. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] The above and / or additional aspects and advantages of the present utility model will become apparent and be readily understood from the description of the embodiments in conjunction with the following drawings, wherein:

[0017] Figure 1 is a three-dimensional schematic diagram of an embodiment of the present utility model;

[0018] Figure 2 is an exploded schematic diagram of an embodiment of the present utility model;

[0019] Figure 3 is a cross-sectional view of an embodiment of the present utility model;

[0020] Figure 4 For Figure 3 the enlarged schematic view of part A;

[0021] Figure 5 It is a schematic view after the pressure relief hole of the embodiment of the present utility model is opened;

[0022] Figure 6 It is an exploded schematic view of the pressure relief structure of the embodiment of the present utility model;

[0023] Figure 7 It is an exploded schematic view of the filter element of the embodiment of the present utility model;

[0024] Figure 8 It is a schematic view of the partial structure of the embodiment of the present utility model.

[0025] Reference numerals:

[0026] Main body assembly 100, oil inlet hole 110, oil inlet cavity 120, oil outlet cavity 130, oil outlet hole 140, pressure relief hole 150, outer shell 160, filter element 170, upper end cover 171, central support cylinder 172, lower end cover 173, filter paper cylinder 174, docking hole 1731, first convex cylinder part 1732, cover shell 161, end shell 162, second convex cylinder part 1621;

[0027] Pressure relief structure 200, plug 210, pressure relief elastic member 220, magnet 211, plugging surface 212, embedding groove 213, mounting bracket 230, mounting cavity 231, abutting portion 232, base shell portion 233, connecting plate portion 234;

[0028] Sealing sleeve 300;

[0029] One-way diaphragm 400;

[0030] Filter element elastic member 500. Specific embodiments

[0031] The embodiments of the present utility model will be described in detail below. The examples of the embodiments are shown in the drawings, where the same or similar reference numerals indicate the same or similar elements or elements with the same or similar functions throughout. The embodiments described below by referring to the drawings are exemplary and are only used to explain the present utility model and should not be construed as a limitation of the present utility model.

[0032] In the description of the present utility model, it should be understood that the orientation or positional relationship indicated by terms such as up, down, front, back, left, right, etc. is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as a limitation of the present utility model.

[0033] In the description of the present utility model, the meaning of "a number of" is one or more, the meaning of "a plurality of" is more than two, and understandings such as "greater than", "less than", "exceeding", etc. do not include the present number, and understandings such as "above", "below", "within", etc. include the present number. If there is a description of "first" and "second", it is only for the purpose of distinguishing technical features and cannot be understood as indicating or implying relative importance or implicitly indicating the quantity of the indicated technical features or implicitly indicating the sequence relationship of the indicated technical features.

[0034] In the description of the present utility model, unless otherwise clearly defined, words such as "arrangement", "installation", "connection", etc. should be understood in a broad sense, and those skilled in the art can reasonably determine the specific meaning of the above words in the present utility model in combination with the specific content of the technical solution.

[0035] Refer to Figures 1 to 8 , an oil filter, which includes a main body assembly 100 and a pressure relief structure 200. The main body assembly 100 is provided with an oil inlet hole 110, an oil inlet cavity 120, an oil outlet cavity 130 and an oil outlet hole 140. The oil inlet hole 110 is communicated with the oil inlet cavity 120. A filtering structure for separating the two is arranged between the oil outlet cavity 130 and the oil inlet cavity 120. The oil outlet hole 140 is communicated with the oil outlet cavity 130. The main body assembly 100 is further provided with a pressure relief hole 150 for communicating the oil inlet cavity 120 and the oil outlet cavity 130. The pressure relief structure 200 is arranged on the main body assembly 100. The pressure relief structure 200 includes a plug 210 and a pressure relief elastic member 220. The plug 210 is movably arranged and can block and open the pressure relief hole 150. The pressure relief elastic member 220 is used to make the plug 210 tend to be held in the blocking position. Among them, the plug 210 is provided with a magnet 211. In some other embodiments, a plug 210 with its own magnetism can also be used.

[0036] When the oil filter works normally, oil enters the oil inlet cavity 120 from the oil inlet hole 110. The oil in the oil inlet cavity 120 reaches the oil outlet cavity 130 after passing through the filtering structure. At this time, the oil is filtered, and the filtered oil is output through the oil outlet hole 140. When the filtering structure is blocked and the oil pressure increases, the oil pressure overcomes the elastic force of the pressure relief elastic member 220 and pushes open the plug 210, thereby opening the pressure relief hole 150, and the oil can flow out through the pressure relief hole 150 to the oil outlet cavity 130 to maintain external output. Since the plug 210 is provided with a magnet 211 or has its own magnetism, ferromagnetic impurities in the oil passing through the pressure relief hole 150 can be adsorbed by the plug 210, thereby reducing the reflux of ferromagnetic impurities.

[0037] By arranging a magnet 211 on the plug 210 of the pressure relief structure 200 or using a plug 210 with inherent magnetism, compared with arranging the magnet 211 at other positions, on the one hand, since the oil for pressure relief will all pass through the plug 210, it effectively ensures the adsorption of impurities in the oil for pressure relief; on the other hand, since the plug 210 itself is a component of the oil filter, arranging it to be magnetic or arranging a magnet 211 thereon occupies less internal space and has little impact on the normal flow of the oil.

[0038] In an embodiment, the magnet 211 can be a neodymium iron boron magnet with strong magnetic force. Of course, it can be imagined that the magnet 211 is not limited to being a neodymium iron boron magnet. For example, it can also be an alnico magnet, a samarium cobalt magnet, etc., and can be specifically selected according to actual situations.

[0039] In an embodiment, the magnet 211 is embedded in the plug 210. By installing the magnet 211 in an embedded manner, the installation is stable and has little impact on the shape of the plug 210.

[0040] In an embodiment, the plug 210 is provided with a plugging surface 212 for plugging and opening the pressure relief hole 150. The plugging surface 212 is provided with an embedded groove 213, and the magnet 211 is installed in the embedded groove 213. With the above structure, the magnet 211 can face the oil directly, and the adsorption effect is good. In some embodiments, the connection between the magnet 211 and the embedded groove 213 can also be strengthened by adding adhesive. It can be imagined that the magnet 211 is not limited to being installed in the above-mentioned embedded groove 213. For example, the magnet 211 can be embedded and installed inside the plug 210.

[0041] In an embodiment, the magnet 211 is within the projection range of the pressure relief hole 150 along the hole axis direction. Thus, when the pressure relief hole 150 is opened in a ferrous material, the magnetic attraction effect between them can be reduced, and the magnet 211 will not touch the peripheral edge of the pressure relief hole 150, avoiding being damaged.

[0042] In an embodiment, the magnet 211 is circular, the pressure relief hole 150 is a circular hole, and the diameter of the magnet 211 is less than or equal to the diameter of the pressure relief hole 150. Of course, it can be imagined that the magnet 211 is not limited to being circular. For example, it can also be square or other shapes.

[0043] It can be understood that when adopting the scheme of arranging the magnet 211 on the plug 210, the magnet 211 is not limited to being installed in the above-mentioned manner. For example, it can also be installed by means of fasteners, etc. Those skilled in the art can specifically configure the installation method of the magnet 211 according to actual situations. When adopting the scheme of using a plug 210 with inherent magnetism, the plug 210 itself can be a magnet.

[0044] In the embodiment, the plug 210 is disposed on the side of the pressure relief hole 150 close to the oil outlet cavity 130, the pressure relief elastic member 220 presses against the side of the plug 210 away from the pressure relief hole 150, and the pressure relief elastic member 220 is in a compressed state. With the above structure, the blocking of the pressure relief hole 150 can be achieved simply in structure.

[0045] In the embodiment, the pressure relief structure 200 further includes a mounting bracket 230. The mounting bracket 230 is disposed in the oil outlet cavity 130 and one end thereof is fixed to the peripheral side of the pressure relief hole 150. The mounting bracket 230 is provided with a mounting cavity 231. The other end of the mounting bracket 230 is provided with an abutting portion 232. The plug 210 is movably disposed on the mounting bracket 230 and can move in the direction close to and away from the pressure relief hole 150. The pressure relief elastic member 220 is disposed in the mounting cavity 231 and is located between the plug 210 and the abutting portion 232. The two ends of the pressure relief elastic member 220 respectively press against the plug 210 and the abutting portion 232. With the above structure, the pressure relief elastic member 220 and the plug 210 can be conveniently installed.

[0046] In the embodiment, the mounting bracket 230 is an integrally formed sheet metal part. The mounting bracket 230 includes a base shell portion 233 and two connecting plate portions 234. The base shell portion 233 is fixed to the peripheral side of the pressure relief hole 150. One end of the connecting plate portion 234 is connected to the base shell portion 233. The mounting cavity 231 is formed by enclosing between the connecting plate portions 234. The abutting portion 232 is disposed at the other end of the connecting plate portion 234 and is a part where the other end of the connecting plate portion 234 extends and bends. The structure of the above mounting bracket 230 is convenient to manufacture. In the embodiment, there are two connecting plate portions 234. In other embodiments, more than two connecting plate portions 234 can also be provided, and can be specifically configured according to actual situations. In the embodiment, the base shell portion 233 can be fixed to the peripheral side of the pressure relief hole 150 by riveting, or can also be connected by means of fastening with fasteners.

[0047] In an embodiment, the main body assembly 100 includes a housing 160 and a filter element 170. The filter element 170 is disposed within the housing 160. The filter element 170 includes an upper end cap 171, a central support cylinder 172, a lower end cap 173, and a filtering structure. The upper and lower ends of the central support cylinder 172 are respectively connected to the upper end cap 171 and the lower end cap 173. A plurality of communication holes for communicating the inside and outside thereof are formed on the circumferential surface of the central support cylinder 172. The filtering structure is a filter paper cylinder 174. The filter paper cylinder 174 is sleeved on the outer circumference of the central support cylinder 172. The upper and lower ends of the filter paper cylinder 174 are respectively connected to the upper end cap 171 and the lower end cap 173. An oil outlet cavity 130 is formed by enclosing between the filter paper cylinder 174, the upper end cap 171, and the lower end cap 173. An oil inlet cavity 120 is formed between the filter element 170 and the inner side wall of the housing 160. An oil inlet hole 110 and an oil outlet hole 140 are formed on the housing 160. The lower end cap 173 is provided with a docking hole 1731 communicating with the oil outlet cavity 130. The oil outlet hole 140 is docked with the docking hole 1731. A pressure relief hole 150 is formed on the upper end cap 171. A pressure relief structure 200 is disposed on the upper end cap 171. The structure of the above-mentioned main body assembly 100 is simple and easy to manufacture and implement.

[0048] In an embodiment, the lower end cap 173 is provided with a first convex cylinder portion 1732 extending downward. The docking hole 1731 is the inner hole of the first convex cylinder portion 1732. The housing 160 includes a cover shell 161 and an end shell 162. The end shell 162 is connected to one end of the cover shell 161. The oil inlet hole 110 and the oil outlet hole 140 are formed on the end shell 162. The inner side of the end shell 162 is provided with a second convex cylinder portion 1621 extending upward. The oil outlet hole 140 is the inner hole of the second convex cylinder portion 1621. The lower end of the first convex cylinder portion 1732 and the upper end of the second convex cylinder portion 1621 are mutually docked and a sealing sleeve 300 is sleeved on the outer circumferences of both. With the above structure, the sealing performance of the docking between the docking hole 1731 and the oil outlet hole 140 is good.

[0049] In an embodiment, a plurality of oil inlet holes 110 are provided and are disposed around the oil outlet hole 140. An annular and elastically deformable one-way diaphragm 400 is integrally formed on the outer circumference of the sealing sleeve 300. The one-way diaphragm 400 covers the oil inlet holes 110. The outer peripheral edge of the one-way diaphragm 400 can be attached to the inner side surface of the end shell 162. With the above structure, the one-way diaphragm 400 can function as a one-way valve, which can prevent the engine oil from flowing back. By integrally forming the one-way diaphragm 400 on the outer circumference of the sealing sleeve 300, two functions can be integrated into a single part, which is convenient for manufacturing and production. In an embodiment, the sealing sleeve 300 and the one-way diaphragm 400 as a whole can be made of rubber, silica gel or other elastic materials.

[0050] In an embodiment, a filter element elastic member 500 for pushing the filter element 170 toward the end shell 162 is disposed between the filter element 170 and the housing 160, so as to better fix the filter element 170 and prevent it from loosening.

[0051] In the embodiment, both the pressure relief elastic member 220 and the filter element elastic member 500 are springs. Of course, it can be imagined that they are not limited to using springs. For example, they can also be elastic sheets or rubber bodies, etc., and can be specifically configured according to the actual situation.

[0052] The technical features of the above embodiments can be combined arbitrarily. For the sake of brevity of description, 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, it should be considered to be within the scope described in this specification.

[0053] The embodiments of the present invention have been described in detail above in conjunction with the accompanying drawings. However, the present invention is not limited to the above embodiments, and various changes can be made without departing from the gist of the present invention within the knowledge scope of those of ordinary skill in the art.

Claims

1. An oil filter, characterized in that, Comprising: A main body component (100) is provided with an oil inlet hole (110), an oil inlet chamber (120), an oil outlet chamber (130) and an oil outlet hole (140). The oil inlet hole (110) communicates with the oil inlet chamber (120). A filtering structure for separating the two is provided between the oil outlet chamber (130) and the oil inlet chamber (120). The oil outlet hole (140) communicates with the oil outlet chamber (130). The main body component (100) is further provided with a pressure relief hole (150) for communicating the oil inlet chamber (120) and the oil outlet chamber (130); A pressure relief structure (200) is disposed on the main body component (100). The pressure relief structure (200) includes a plug (210) and a pressure relief elastic member (220). The plug (210) is movably arranged and can block and open the pressure relief hole (150). The pressure relief elastic member (220) is used to make the plug (210) tend to stay in the blocking position; Wherein, the plug (210) is provided with a magnet (211) or the plug (210) itself has magnetism.

2. The oil filter according to claim 1, wherein: The plug (210) is provided with a magnet (211) and the magnet (211) is embedded in the plug (210).

3. The oil filter according to claim 1, characterized in that: The plug (210) is provided with a blocking surface (212) for blocking and opening the pressure relief hole (150). The blocking surface (212) is provided with an embedding groove (213), and the magnet (211) is installed in the embedding groove (213).

4. The oil filter according to claim 2, wherein: The magnet (211) is within the projection range of the pressure relief hole (150) along the hole axis direction.

5. The oil filter according to claim 4, wherein: The magnet (211) is circular, the pressure relief hole (150) is a round hole, and the diameter of the magnet (211) is less than or equal to the diameter of the pressure relief hole (150).

6. The oil filter according to claim 1, characterized in that: The plug (210) is disposed on the side of the pressure relief hole (150) close to the oil outlet chamber (130). The pressure relief elastic member (220) presses against the side of the plug (210) away from the pressure relief hole (150), and the pressure relief elastic member (220) is in a compressed state.

7. The oil filter according to claim 6, wherein: The pressure relief structure (200) further includes a mounting bracket (230). The mounting bracket (230) is disposed in the oil outlet chamber (130) and one end is fixed to the circumferential side of the pressure relief hole (150). The mounting bracket (230) is provided with a mounting cavity (231). The other end of the mounting bracket (230) is provided with an abutting portion (232). The plug (210) is movably arranged on the mounting bracket (230) and can move in the direction close to and away from the pressure relief hole (150). The pressure relief elastic member (220) is disposed in the mounting cavity (231) and is located between the plug (210) and the abutting portion (232). The two ends of the pressure relief elastic member (220) respectively press against the plug (210) and the abutting portion (232).

8. The oil filter according to claim 7, wherein: The mounting bracket (230) is a sheet metal part formed integrally. The mounting bracket (230) includes a base shell part (233) and at least two connecting plate parts (234). The base shell part (233) is fixed to the circumferential side of the pressure relief hole (150). One end of the connecting plate part (234) is connected to the base shell part (233). An installation cavity (231) is formed by enclosing between the connecting plate parts (234). The abutting part (232) is arranged at the other end of the connecting plate part (234) and is a part that extends and bends at the other end of the connecting plate part (234).

9. The oil filter according to claim 1, wherein: The main body assembly (100) includes a housing (160) and a filter element (170). The filter element (170) is arranged inside the housing (160). The filter element (170) includes an upper end cover (171), a central support cylinder (172), a lower end cover (173), and the filtering structure. The upper and lower ends of the central support cylinder (172) are respectively connected to the upper end cover (171) and the lower end cover (173). A plurality of communication holes communicating the inside and outside thereof are formed on the circumferential surface of the central support cylinder (172). The filtering structure is a filter paper cylinder (174). The filter paper cylinder (174) is sleeved on the outer periphery of the central support cylinder (172). The upper and lower ends of the filter paper cylinder (174) are respectively connected to the upper end cover (171) and the lower end cover (173). An oil outlet cavity (130) is formed by enclosing between the filter paper cylinder (174), the upper end cover (171), and the lower end cover (173). An oil inlet cavity (120) is formed between the filter element (170) and the inner side wall of the housing (160). The oil inlet hole (110) and the oil outlet hole (140) are formed on the housing (160). The lower end cover (173) is provided with a docking hole (1731) communicating with the oil outlet cavity (130). The oil outlet hole (140) is docked with the docking hole (1731). The pressure relief hole (150) is formed on the upper end cover (171). The pressure relief structure (200) is arranged on the upper end cover (171).

10. The oil filter according to claim 9, characterized in that: The lower end cover (173) is provided with a first convex cylinder part (1732) extending downward. The docking hole (1731) is the inner hole of the first convex cylinder part (1732). The housing (160) includes a cover shell (161) and an end shell (162). The end shell (162) is connected to one end of the cover shell (161). The oil inlet hole (110) and the oil outlet hole (140) are formed on the end shell (162). The inner side of the end shell (162) is provided with a second convex cylinder part (1621) extending upward. The oil outlet hole (140) is the inner hole of the second convex cylinder part (1621). The lower end of the first convex cylinder part (1732) and the upper end of the second convex cylinder part (1621) are mutually docked and a sealing sleeve (300) is sleeved on the outer periphery of both of them; A plurality of the oil inlet holes (110) are provided and arranged around the oil outlet hole (140). An annular and elastically deformable one-way diaphragm (400) is integrally formed on the outer periphery of the sealing sleeve (300). The one-way diaphragm (400) covers the oil inlet holes (110), and the outer peripheral edge of the one-way diaphragm (400) can be attached to the inner side surface of the end shell (162). A filter element elastic member (500) for pushing the filter element (170) towards the end shell (162) is provided between the filter element (170) and the outer shell (160).

Images