An oral placement bypass valve and oil filter using the same

Abstract

An oral bypass valve and an oil filter using the bypass valve belong to the technical field of motor vehicle lubricating oil filtering. In view of the problem that the traditional bypass valve is installed at the bottom of the shell and is easy to be involved in the deposition of impurities, causing oil path pollution, the bypass valve comprises an upper cover, a lower cover, a sealing gasket, a cover and a spring, the upper cover and the lower cover are riveted to clamp the sealing gasket, the spring is arranged inside the lower cover and tightly presses the cover and the sealing gasket to seal the central oil outlet, and the outer periphery of the upper cover is provided with an oil passage hole; the bypass valve is assembled inside the oil filter port, is clamped and fixed through a filter element and an elastic support structure, the oil passage hole corresponds to a dirty oil inlet, and the central oil outlet is connected with a clean oil outlet. By installing the bypass valve inside the port away from the impurity deposition area, combining the double sealing structure and the compact design, the short path flow of oil liquid is realized when bypassing to avoid the involvement of impurities, the working reliability of the oil filter and the cleanliness of the engine lubricating system are improved, and the oil filter is used for the oil filter installed upward or downward.

Description

Technical Field

[0001] This utility model relates to the filtration technology of motor vehicle lubricating oil (engine oil), and more particularly to the bypass valve for engine oil filter, which mainly solves the problem of sediment disturbance when the bypass valve of an engine oil filter with the port facing upward is opened. Background Technology

[0002] The oil filter is a key component of the automotive engine lubrication system. Its core function is to filter impurities in the oil (such as metal shavings, gum, etc.), prevent impurities from entering the moving parts of the engine (such as the crankshaft, camshaft, etc.), prevent component wear, and ensure the normal operation of the engine.

[0003] The bypass valve is an important component of the oil filter. Its function is to open when the oil filter element is clogged or the oil viscosity is too high, resulting in excessive filtration resistance. This allows unfiltered oil to directly enter the lubrication system through the bypass channel, preventing dry friction damage to the engine due to lack of oil and ensuring the basic function of the lubrication system.

[0004] When an oil filter with its inlet facing upwards is working properly, the oil enters through the filter inlet and flows laterally through the filter element to the clean oil chamber in the middle of the filter element. Within the clean oil chamber, the oil flows downwards to the bottom of the housing and then upwards through the central hole (oil outlet) at the inlet. Impurities in the clean oil chamber accumulate and deposit at the bottom of the housing over time due to gravity. Figure 2 and Figure 3 The red area represents the impurity deposition zone.

[0005] like Figure 3 As shown, the existing technology has shortcomings in the structural design and installation position of traditional bypass valves when the port is installed facing upwards: traditional bypass valves are usually assembled at the other end of the product housing opposite the port (i.e., the bottom of the housing when the port is installed upwards), which coincides with the impurity deposition area. When the traditional bypass valve opens due to insufficient oil pressure or filter element blockage, the oil will carry up the impurities deposited at the bottom as it passes through the bypass valve, enter the clean oil chamber inside the filter element frame through the bypass valve, and then flow out from the product oil outlet. This causes the impurities to re-enter the lubrication oil circuit, contaminate the downstream oil circuit, cause damage to moving parts, and affect the normal operation of the engine.

[0006] Existing technologies focus on the basic pressure control function of bypass valves (i.e., opening or closing through the balance of spring force and hydraulic pressure), without fully considering the correlation between installation position and impurity deposition patterns. This primarily ignores the core contradiction of "the bypass valve installation position coinciding with the impurity deposition area" in scenarios where the port faces upwards. Correspondingly, this invention establishes a novel technical approach that avoids the impurity deposition area by adjusting the installation position of the bypass valve.

[0007] Therefore, for oil filters with the inlet facing upwards, the oil circuit contamination problem caused by the traditional bypass valve coinciding with the impurity deposition area has become a key bottleneck restricting the reliability of the lubrication system. It is urgent to solve this defect through structural improvement in order to prevent impurities from entering the oil circuit through the bypass valve and ensure the long-term stable operation of the engine. Utility Model Content

[0008] The purpose of this invention is to provide an oil filter bypass valve structure that can be adjusted to move away from the impurity deposition area by adjusting the installation position of the bypass valve, thereby overcoming the defect in the prior art where impurities enter the oil circuit due to the overlap or proximity of the bypass valve and the impurity deposition area.

[0009] To achieve the above objectives, this utility model provides a bypass valve with an inlet, comprising a bypass valve upper cover, a bypass valve lower cover, a sealing gasket, a protective cover, and a spring; the bypass valve upper cover and the bypass valve lower cover are fixedly connected, and the sealing gasket is clamped between the two; the spring is disposed inside the bypass valve lower cover, and its own elasticity presses the protective cover and the sealing gasket against the central oil outlet of the bypass valve upper cover, forming a central oil outlet seal; the outer peripheral area of ​​the bypass valve upper cover is provided with multiple oil passage holes for introducing the oil to be filtered.

[0010] The upper cover of the bypass valve and the lower cover of the bypass valve are fixedly connected by riveting. When riveting, the sealing gasket is clamped to form a sealing gasket at the riveting point.

[0011] The bottom of the bypass valve cover is provided with an annular platform, the bottom end of the spring is placed on the annular platform, and the axis of the spring is coaxial with the axis of the central oil outlet of the bypass valve cover.

[0012] The outer periphery of the bypass valve cover is provided with 5 oil passage holes. The oil passage holes are evenly distributed along the circumference of the cover, with a diameter of 5-8mm. The position of the oil passage holes corresponds to the peripheral dirty oil inlet or dirty oil inlet chamber of the oil filter.

[0013] The outer side of the bypass valve cover is flat, and its radial dimension is adapted to the inner space of the oil filter inlet.

[0014] This utility model also provides an oil filter using the above-mentioned bypass valve placed in the port, including a filter housing, a port located at the top of the housing, a clean oil outlet at the center of the port, a dirty oil inlet around the port, a filter element, and an elastic support structure; the bypass valve placed in the port is assembled inside the port of the housing and is clamped and fixed by the filter element and the elastic support structure, and the oil outlet at the center of the bypass valve cover is connected to the clean oil outlet at the center of the port, and the oil passage at the top of the bypass valve cover is connected to the dirty oil inlet around the port.

[0015] The elastic support structure is tightly fitted to the bottom of the housing, and the upper end face of the elastic support structure presses against the lower end face of the filter element, while the upper end face of the filter element presses against the lower cover of the bypass valve, forming an axial clamping fixation.

[0016] This utility model has the following advantages: The structure of this utility model ensures that the central oil outlet is sealed to prevent leakage when closed, while the outer peripheral oil passage provides a channel for dirty oil to enter. The overall structure is adapted to the installation space at the port, laying the foundation for staying away from the bottom impurity deposition area.

[0017] The spring is located inside the lower cover of the bypass valve and below the upper cover of the bypass valve, and also forms a gap between it and the top of the oil filter housing. Even if the present invention is installed upside down (with the opening facing down), the bypass part is higher than the impurity deposition area, so the present invention is applicable not only to the installation structure with the opening facing up, but also to the installation structure with the opening facing down.

[0018] The rigid connection of the riveting avoids the risk of oil leakage from the gap of the bolt connection, and the sealing gasket further enhances the sealing performance of the riveting, making it suitable for compact installation environments.

[0019] The ring platform restricts the lateral displacement of the spring, and the coaxial design ensures that the spring force acts perpendicularly on the sealing gasket, avoiding local leakage caused by seal misalignment and improving sealing reliability.

[0020] Five evenly distributed oil passages ensure sufficient flow and balanced pressure for dirty oil, preventing localized oil impacts that could deform the gaskets. The orifice design is adapted to the flow requirements of conventional engine oil.

[0021] The flat design reduces radial space occupation, ensures assembly compatibility between the bypass valve and filter element and elastic support structure, and avoids interference with the internal structure of the port.

[0022] When the filter element is clogged, the oil pressure increases. When the oil pressure is higher than the spring pressure, dirty oil enters from the peripheral inlet and passes directly through the bypass valve. The flow path is short and far away from the impurity deposition area at the bottom of the housing, thus avoiding impurities from being drawn into the oil circuit.

[0023] The bypass valve is fixed by utilizing the assembly preload of the elastic support structure, eliminating the need for additional connecting parts, simplifying the assembly process, and ensuring structural stability. Attached Figure Description

[0024] Figure 1 This is a cross-sectional structural diagram of a bypass valve placed at the port of this utility model.

[0025] Figure 2 This is a half-sectional structural diagram of the oil filter of this utility model.

[0026] Figure 3 This is a schematic diagram of a partial cross-section of an existing oil filter.

[0027] Figure 4 This is a three-dimensional structural diagram of a bypass valve placed at the port of this utility model.

[0028] Figure 2 and Figure 3 The path indicated by the blue line and blue arrow is the normal oil flow path when the bypass valve is not open.

[0029] Figure 2 and Figure 3 The path shown by the green line and green arrow is the oil flow path when the bypass valve is open. Detailed Implementation

[0030] like Figure 1 , Figure 2 and Figure 4 As shown, a bypass valve with an inlet of this utility model includes a bypass valve upper cover 1, a bypass valve lower cover 2, a sealing gasket 3, a protective cover 4, and a spring 5; the bypass valve upper cover 1 and the bypass valve lower cover 2 are fixedly connected, and the sealing gasket 3 is clamped between the two; the spring 5 is disposed inside the bypass valve lower cover 2, and uses its own elasticity to press the protective cover 4 and the sealing gasket 3 against the central oil outlet 6 of the bypass valve upper cover 1, forming a central oil outlet seal; the outer peripheral area of ​​the bypass valve upper cover 1 is provided with a plurality of oil passage holes 7 for introducing the oil to be filtered.

[0031] The central oil outlet 6 corresponds to the central clean oil outlet 8 at the oil filter port, and the peripheral oil passage 7 corresponds to the peripheral dirty oil inlet 9 at the port, thus solving the technical problem of "separation of bypass path and impurity deposition area".

[0032] The structure of this utility model ensures that the central oil outlet is sealed to prevent leakage when closed, while the outer peripheral oil passage 7 provides a channel for dirty oil to enter. The overall structure is adapted to the installation space at the opening, laying the foundation for staying away from the bottom impurity deposition area.

[0033] The balance between the spring force of spring 5 and the hydraulic pressure of the oil controls the opening / closing of the sealing gasket 3. When the filter element's filtration resistance is too high, it achieves a short-path bypass of "dirty oil entering from the peripheral dirty oil inlet 9 → bypass → central oil outlet 6 and central clean oil outlet 8", preventing impurities deposited when the bypass valve is open from being carried into the oil circuit. Spring 5 is located inside the lower cover 2 of the bypass valve and below the upper cover 1 of the bypass valve. The bypass part also forms a gap between itself and the top of the oil filter housing. Even if this utility model is installed upside down (with the opening facing down), the bypass part is higher than the impurity deposition area, making this utility model suitable not only for installation structures with the opening facing up but also for installation structures with the opening facing down.

[0034] The upper cover 1 and lower cover 2 of the bypass valve are fixedly connected by riveting. During riveting, the sealing gasket 3 is clamped to form a sealing gasket at the riveting point. The rigid connection of the riveting avoids the risk of oil leakage from the gap of the bolt connection, and the sealing gasket further enhances the sealing performance at the riveting point, making it suitable for compact installation environments. The sealing gasket 3 has a thickness of 1.5 mm, a hardness of SH75±5, and is preferably made of nitrile rubber.

[0035] The bottom of the bypass valve lower cover 2 is provided with an annular platform 10. The bottom end of the spring 5 is placed on the annular platform 10, and the axis of the spring 5 is coaxial with the axis of the central oil outlet 6 of the bypass valve upper cover 1. The annular platform 10 restricts the lateral displacement of the spring 5, and the coaxial design ensures that the elastic force acts perpendicularly on the sealing gasket 3, avoiding local leakage caused by seal misalignment and improving sealing reliability.

[0036] The outer periphery of the bypass valve cover 1 is provided with five oil passage holes 7. The oil passage holes 7 are evenly distributed along the circumference of the cover, with a diameter of 5-8 mm. The positions of the oil passage holes 7 correspond to the peripheral dirty oil inlet 9 or dirty oil inlet chamber of the oil filter. The five evenly distributed oil passage holes 7 ensure sufficient flow and balanced pressure of dirty oil, avoiding local oil impact that could cause deformation of the sealing gasket 3. The hole diameter design is adapted to the normal oil flow requirements.

[0037] The outer side of the bypass valve cover 1 is flat, and its radial dimensions are adapted to the inner space of the oil filter inlet. The flat design reduces the radial space occupied, ensures the assembly compatibility of the bypass valve with the filter element and the elastic support structure, and avoids interference with the inner structure of the inlet.

[0038] This utility model also discloses an oil filter using the aforementioned bypass valve placed in the opening, including a filter housing 11 and an opening located at the top of the housing 11. The opening has a clean oil outlet 8 at its center and a dirty oil inlet 9, a filter element 12, and an elastic support structure around its periphery. The bypass valve placed in the opening is assembled inside the opening of the housing 11 and is clamped and fixed by the filter element 12 and the elastic support structure 13. The oil outlet 6 at the center of the bypass valve cover 1 is connected to the clean oil outlet 8 at the center of the opening, and the oil passage 7 at the bypass valve cover 1 is connected to the dirty oil inlet 9 around the opening.

[0039] The clamping and fixing structure of the bypass valve, including the housing 11, the port, the filter element 12, and the elastic support structure 13, ensures that the bypass valve is located inside the port, achieving precise alignment between the "oil passage 7 - peripheral dirty oil inlet 9" and the "central oil outlet 6 - central clean oil outlet 8". The elastic support structure 13 can be a conventional elastic element such as an elastic sheet, a coil spring, a disc spring, or a rubber elastomer.

[0040] When filter element 12 is clogged, the oil pressure increases. When the oil pressure is higher than the pressure of spring 5, dirty oil enters from the peripheral inlet and passes directly through the bypass valve. The flow path is short and far away from the impurity deposition area at the bottom of housing 11, thus avoiding impurities from being drawn into the oil circuit.

[0041] The elastic support structure 13 is tightly fitted to the bottom of the housing 11, and the upper end face of the elastic support structure 13 presses against the lower end face of the filter element 12, and the upper end face of the filter element 12 presses against the lower cover 2 of the bypass valve, forming an axial clamping fixation.

[0042] The bypass valve is fixed by utilizing the assembly preload of the elastic support structure 13, eliminating the need for additional connecting parts, simplifying the assembly process, and ensuring structural stability.

[0043] This utility model discloses a bypass valve with its inlet placed inside the inlet of an oil filter (clamped and fixed by the filter element 12 and the elastic support structure 13). Its working process is divided into two types: the bypass valve is not open (normal filtration state) and the bypass valve is open (bypass state). The oil flow path and working principle in the two states are as follows: 1. Normal filtration flow path when the bypass valve is not open (oil pressure < bypass valve opening pressure).

[0044] 1. Oil flow path.

[0045] Unfiltered dirty oil → Dirty oil inlet 9 around the oil filter port → Inside the filter housing 11 → Flows through the filter element 12 → Clean oil → Clean oil outlet 8 in the center of the port → Engine lubrication system.

[0046] 2. Key technical features and working principles.

[0047] Port structure and bypass valve positioning: The filter port has a clean oil outlet 8 at the center and a dirty oil inlet 9 around the perimeter; the bypass valve is assembled inside the port and is clamped and fixed by the filter element 12 and the elastic support structure 13 (the lower cover 2 of the bypass valve contacts the lower end face of the filter element 12, and the upper end face of the elastic support structure 13 presses against the lower end face of the filter element 12 to form an axial clamping), ensuring that the oil passage hole 7 of the upper cover 1 of the bypass valve corresponds to the dirty oil inlet 9 around the port, and the central oil outlet 6 is connected to the clean oil outlet 8 at the center of the port.

[0048] Bypass valve closing sealing mechanism: Sealing at the riveting joint: The upper cover 1 and the lower cover 2 of the bypass valve are fixedly connected by riveting. When riveting, the sealing gasket 3 is clamped to form a sealing gasket at the riveting joint, which prevents dirty oil from leaking from the connection gap.

[0049] Oil outlet sealing: Spring 5 is placed on the annular platform 10 at the bottom of the bypass valve lower cover 2. Through its own elasticity, it presses the cover 4 and the sealing gasket 3 against the center oil outlet 6 of the bypass valve upper cover 1 (the axis of spring 5 is coaxial with the axis of the center oil outlet 6 to ensure uniform elasticity). At this time, there is no gap between the sealing gasket 3 and the center oil outlet 6, and dirty oil cannot directly enter the clean oil outlet 8 through the bypass valve.

[0050] 3. Corresponding technical effects: Sealing reliability: The double sealing structure (riveted gasket sealing + oil outlet spring 5 tightening seal) ensures no leakage when the bypass valve is closed. Dirty oil must flow through filter element 12 for filtration to prevent unfiltered oil from directly entering the oil circuit.

[0051] Structural stability: The positioning effect of the annular platform 10 on the spring 5 prevents the spring 5 from shifting laterally, and the cover 4 transmits the elastic force evenly, ensuring that the sealing gasket 3 and the central oil outlet 6 are in contact and sealed, preventing seal failure caused by uneven local pressure.

[0052] II. Oil flow path after the bypass valve is opened (oil pressure ≥ bypass valve opening pressure) 1. Oil flow path Unfiltered dirty oil → Dirty oil inlet 9 around the oil filter port → Oil passage hole 7 in the outer peripheral area of ​​the bypass valve cover 1 → Inside the bypass valve → Oil pressure compression spring 5 → Gap between the sealing gasket 3 and the center oil outlet 6 of the bypass valve cover 1 → Dirty oil passes through the gap → Center oil outlet 6 of the bypass valve → Clean oil outlet 8 in the center of the port → Engine lubrication system (around the filter element 12, not flowing through the impurity deposition area at the bottom of the housing 11).

[0053] 2. Key technical features and working principle Bypass trigger condition: When filter element 12 is clogged or the oil viscosity increases, causing the filtration resistance to increase, the dirty oil pressure rises to ≥ the bypass valve opening pressure (preload of spring 5). The oil pressure overcomes the spring force of spring 5, pushing the cover 4 and sealing gasket 3 downward, compressing spring 5.

[0054] Oil bypass channel formation: After the sealing gasket 3 moves down, an annular gap is formed between it and the central oil outlet 6 of the bypass valve cover 1. Dirty oil enters the bypass valve from the oil passage 7 (5 holes evenly distributed around the circumference, with a diameter of 5-8 mm, which are connected to the dirty oil inlet 9 around the opening) of the bypass valve cover 1, and flows out from the central oil outlet 6 through this gap, thus realizing the bypass function.

[0055] Impurity avoidance mechanism: The bypass valve is installed on the inside of the inlet (near the clean oil outlet 8), while the impurity deposition area is located at the bottom of the filter housing 11 (away from the inlet). Dirty oil enters from the peripheral dirty oil inlet 9 and passes directly through the bypass valve. The flow path is short and does not pass through the bottom of the housing 11, so it will not stir up the deposited impurities.

[0056] 3. The technical effects include: Impurity contamination avoidance: The bypass path completely avoids the impurity deposition area at the bottom of the housing 11, solving the problem of impurities being drawn into the oil circuit due to the traditional bypass valve being installed at the bottom, and protecting the engine moving parts from wear.

[0057] Flow stability: Five circumferentially distributed oil passages ensure sufficient flow of dirty oil and avoid pressure fluctuations caused by local throttling; the size of the annular gap is dynamically adjusted with the oil pressure to ensure that the bypass flow is adapted to the engine lubrication requirements.

[0058] Compact design: The flat outer side of the bypass valve cover 1 is designed to fit the limited space inside the port, and the riveted connection does not require additional bolts, simplifying the structure and improving assembly efficiency.

[0059] III. Summary The bypass valve at this port works by employing a mechanism of "double sealing to ensure filtration when not in use and short-path bypass to avoid impurities when in use." Combined with structural designs such as riveted seals, dynamic sealing of spring 5-cover 4, and positioning of the annular platform 10, it achieves the dual functions of "reliable sealing" and "impurity avoidance," significantly improving the working reliability of the oil filter and the cleanliness of the engine lubrication system.

[0060] The above embodiments are only used to illustrate and not limit the technical solutions of this utility model. Although the utility model has been described in detail with reference to the above embodiments, those skilled in the art should understand that modifications or equivalent substitutions can still be made to the utility model without departing from the spirit and scope of the utility model. Any modifications or partial substitutions should be covered within the scope of the claims of this utility model.

Claims

1. A bypass valve with an inlet, characterized in that: It includes a bypass valve upper cover, a bypass valve lower cover, a sealing gasket, a protective cover, and a spring; the bypass valve upper cover and the bypass valve lower cover are fixedly connected and the sealing gasket is clamped between the two; the spring is set inside the bypass valve lower cover and uses its own elasticity to press the protective cover and the sealing gasket against the central oil outlet of the bypass valve upper cover to form a central oil outlet seal; the outer peripheral area of ​​the bypass valve upper cover is provided with multiple oil passage holes for introducing the oil to be filtered.

2. A bypass valve with an inlet as described in claim 1, characterized in that: The upper cover of the bypass valve and the lower cover of the bypass valve are fixedly connected by riveting. When riveting, the sealing gasket is clamped to form a sealing gasket at the riveting point.

3. A bypass valve with an inlet as described in claim 1, characterized in that: The bottom of the bypass valve cover is provided with an annular platform, the bottom end of the spring is placed on the annular platform, and the axis of the spring is coaxial with the axis of the central oil outlet of the bypass valve cover.

4. A bypass valve with an inlet as described in claim 1, characterized in that: The outer periphery of the bypass valve cover is provided with 5 oil passage holes. The oil passage holes are evenly distributed along the circumference of the cover, with a diameter of 5-8mm. The position of the oil passage holes corresponds to the peripheral dirty oil inlet or dirty oil inlet chamber of the oil filter.

5. A bypass valve with an inlet as described in claim 1, characterized in that: The outer side of the bypass valve cover is flat, and its radial dimension is adapted to the inner space of the oil filter inlet.

6. An oil filter using a bypass valve with an inlet as described in any one of claims 1-5, characterized in that: The filter includes a filter housing, an opening located at the top of the housing, a clean oil outlet at the center of the opening, a dirty oil inlet around the opening, a filter element, and an elastic support structure; a bypass valve is placed inside the opening of the housing and is clamped and fixed by the filter element and the elastic support structure, and the oil outlet at the center of the bypass valve cover is connected to the clean oil outlet at the center of the opening, and the oil passage at the top of the bypass valve cover is connected to the dirty oil inlet around the opening.

7. The oil filter according to claim 6, characterized in that: The elastic support structure is tightly fitted to the bottom of the housing, and the upper end face of the elastic support structure presses against the lower end face of the filter element, while the upper end face of the filter element presses against the lower cover of the bypass valve, forming an axial clamping fixation.

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