A membrane flap check valve in an engine oil control valve

Abstract

The utility model belongs to one -way valve technical field, specifically disclose a membrane lobe check valve in oil control valve, including framework, be equipped with the installation cavity in the framework, be equipped with the oil passage hole that communicates with the installation cavity on the framework, the bottom of framework is equipped with the through -hole that communicates with the installation cavity, the bottom of installation cavity is connected with elastic component, be equipped with the support muscle that is used for supporting the elastic component in the through -hole, the elastic component can form the oil clearance, the elastic component produces axial deformation when being impacted by the positive oil pressure and makes the oil clearance open and lead through, the elastic component produces axial deformation reset when being impacted by the reverse oil pressure or the positive oil pressure is zero and makes the oil clearance close and block. The utility model can reduce the risk of reverse leakage, improve the reliability of oil control system.

Description

Technical Field

[0001] This utility model relates to the field of one-way valve technology, specifically to a diaphragm-type check valve in an oil control valve. Background Technology

[0002] In oil control systems, check valves are key components for controlling the unidirectional flow of oil, and their performance directly affects the system's sealing and stability. Existing check valves mostly employ a rigid structure design, primarily consisting of a steel ball, spring, spring seat, plastic valve body, and valve seat. Their working principle is based on the interaction between oil pressure and spring force: in the open state, when the oil pressure at the valve seat inlet is greater than the spring preload, the spring is compressed, causing the steel ball to move forward. At this time, the oil inlet on the valve seat connects with the oil passage on the valve body. In the closed (check valve) state, the oil pressure at the inlet is zero, and the steel ball, under the spring force, falls back to the valve seat and forms a sealing surface, thus preventing oil from flowing out from the oil passage on the valve body into the oil inlet on the valve seat, thereby achieving the check valve function.

[0003] However, this check valve has obvious drawbacks: First, the overall structure contains multiple parts, resulting in a complex structure and numerous assembly steps, which increases the complexity and cost of the production process; Second, because the steel ball will hit the valve seat multiple times when switching between the open and closed states, the valve seat is prone to wear and deformation after long-term use, and the sealing surface will fail after long-term use, posing a risk of reverse leakage and affecting the reliability of the oil control system. Utility Model Content

[0004] This invention provides a diaphragm-type check valve for an oil control valve, which aims to reduce the risk of reverse leakage and improve the reliability of the oil control system.

[0005] This utility model is achieved through the following technical solution: a diaphragm-type check valve in an oil control valve includes a frame, a mounting cavity inside the frame, an oil passage hole communicating with the mounting cavity on the frame, and a through hole communicating with the mounting cavity at the bottom of the frame; an elastic component is connected to the bottom of the mounting cavity, and a support rib for supporting the elastic component is provided in the through hole; the elastic component can form an oil passage gap; when the elastic component is subjected to a positive oil pressure impact, it undergoes axial deformation, thereby opening and conducting the oil passage gap; when the elastic component is subjected to a reverse oil pressure impact and undergoes axial deformation to reset, or when the positive oil pressure is zero, it closes and blocks the oil passage gap.

[0006] Compared with the prior art, this utility model has the following advantages and beneficial effects:

[0007] In this design, the oil passage gap on the elastic component can undergo axial deformation and unidirectional conduction when subjected to positive oil pressure impact, or undergo axial deformation and reset and unidirectional closure when subjected to reverse oil pressure impact. When the oil passage gap of the elastic component is unidirectionally open, the oil enters the mounting cavity from the oil passage gap of the elastic component, and then enters the control valve from the oil passage hole.

[0008] Existing rigid check valves consist of multiple independent components such as a steel ball, spring, spring seat, plastic valve body, and valve seat, requiring multi-step assembly. The improved design, however, simplifies the structure with a "skeleton + elastic component (integrating sealing and deformation functions) + support ribs," reducing the number and types of parts. This significantly simplifies the assembly process (eliminating the need for precise alignment of components like the steel ball and spring), lowers assembly difficulty and labor costs, and reduces the risk of performance fluctuations due to accumulated tolerances in multiple components. This, in turn, improves production efficiency and product consistency. The significantly simplified structure and assembly process reduce production complexity and costs.

[0009] In addition, existing rigid structures rely on the rigid impact between the steel ball and the valve seat to achieve sealing. Long-term impact can easily lead to wear and deformation of the valve seat and failure of the sealing surface. In contrast, this solution uses an elastic component as the core sealing element. The elastic component achieves on / off switching through its own axial elastic deformation (deformation opens the channel under forward oil pressure and elastic reset closes under reverse oil pressure), replacing the traditional rigid impact sealing between the steel ball and the valve seat. This fundamentally avoids the problem of valve seat wear and deformation caused by impact during long-term use and extends the service life of the sealing surface.

[0010] The elastic component has a certain degree of flexibility, and can form a tight fit with the bottom of the mounting cavity when reset. It can even compensate for assembly or processing errors through slight deformation, thereby improving the reliability of static sealing (closed state) and effectively reducing the risk of reverse leakage.

[0011] The deformation of the elastic component is driven solely by the oil pressure difference, eliminating the need to overcome the spring preload (traditional solutions require oil pressure greater than spring force to open). This results in a more sensitive response to oil pressure changes, especially under low oil pressure conditions, enabling faster conduction and reducing flow lag. Furthermore, the elastic material itself possesses vibration-absorbing properties, allowing it to buffer impacts through deformation during oil pressure fluctuations. This reduces vibration and noise generated by the impact of the steel ball against the valve seat in traditional rigid structures, thereby improving system stability.

[0012] Furthermore, in traditional steel ball structures, if the engine oil contains tiny impurities, it may cause the steel ball to get stuck or the sealing surface to be scratched; while the flexible surface of the elastic component has a certain "tolerance" for small particulate impurities, and the deformation during switching can wash the surface to a certain extent, reducing the risk of sticking.

[0013] Furthermore, the elastic component includes an elastic diaphragm, and the oil passage gap is a cross-shaped opening at the center of the elastic diaphragm; when the elastic diaphragm is subjected to a positive oil pressure impact, it deforms axially, causing the cross-shaped opening to open; when the elastic diaphragm is subjected to a reverse oil pressure impact, it deforms axially to reset, or when the positive oil pressure is zero, it causes the cross-shaped opening to close.

[0014] Beneficial effects: The cross-shaped opening design at the center of the elastic diaphragm in this design features "dynamic adaptive sealing": When there is no positive oil pressure, the diaphragm's own elasticity causes the cross-shaped opening to close naturally, with the edges tightly fitting to form an effective seal, preventing reverse oil leakage; under positive oil pressure impact, the diaphragm deforms axially, opening the cross-shaped opening precisely to form a flow channel, ensuring one-way oil flow. Compared to traditional rigid structures, the opening and closing of the cross-shaped opening is synchronized with the diaphragm deformation, resulting in a more direct sealing response and higher fit, maintaining a reliable seal even under low-pressure conditions.

[0015] The system integrates sealing and deformation functions using a single elastic diaphragm, replacing the traditional combination of multiple components such as steel balls, springs, and valve seats, significantly reducing the number of parts. Furthermore, the cross-shaped opening can be molded in one step using a molding process, eliminating the need for additional processing steps. This facilitates integrated injection molding and fixation with the frame, significantly simplifying the assembly process, reducing production complexity and costs, and improving product consistency.

[0016] In addition, the cross opening can open evenly when the diaphragm deforms axially, forming a symmetrical flow path and reducing oil flow resistance. Compared with the local channel when the traditional steel ball opens, its flow cross section is more regular, which can achieve a larger flow rate under the same oil pressure, reduce system pressure loss, and improve oil control efficiency.

[0017] Furthermore, the elastic component includes multiple elastic diaphragms, which are circumferentially distributed and have adjacent edges that adhere to each other to form an initially closed oil passage gap. When the multiple elastic diaphragms are subjected to a positive oil pressure impact and undergo axial deformation, the oil passage gap between adjacent elastic diaphragms opens. When the multiple elastic diaphragms are subjected to a reverse oil pressure impact and undergo axial deformation reset, or when the positive oil pressure is zero, the edges of adjacent elastic diaphragms re-adhere to each other, thereby closing the oil passage gap between adjacent elastic diaphragms.

[0018] Beneficial effects: This solution provides an alternative structural form for elastic components.

[0019] Furthermore, the elastic diaphragm is a thin-walled rubber component.

[0020] Beneficial effects: The thin-walled structure of the elastic diaphragm in this solution gives the rubber diaphragm lower stiffness. When subjected to positive oil pressure impact, only a small pressure is needed to produce axial deformation (such as the cross opening or the gap between multiple diaphragms opening), which significantly improves the response speed to oil pressure changes. When reverse oil pressure is applied, the elastic restoring force of the rubber itself can quickly drive the diaphragm to reset, ensuring that the sealing surface closes in time, reducing hysteresis, and adapting to the working conditions of frequent oil pressure fluctuations in the oil system.

[0021] Rubber material has good elasticity and plasticity. Its thin-walled design allows it to fit more closely to the support surface when resetting and sealing. It fills the small imperfections or processing errors on the contact surface through slight deformation, forming a flexible seal. Compared with the rigid seal between the traditional steel ball and the valve seat, the elastic contact of rubber can effectively disperse the sealing stress, improve the adaptability of the sealing surface, and significantly reduce the risk of reverse leakage.

[0022] Furthermore, the supporting reinforcement is a cross-shaped reinforcement.

[0023] Beneficial effects: The four ribs of the cross-shaped ribs are radially distributed, supporting the diaphragm while forming four symmetrical fan-shaped channels between them. During positive oil pressure impact, the oil can flow smoothly through these channels. Compared to the traditional multiple randomly distributed support ribs, the regular layout of the cross-shaped ribs reduces fluid flow around and eddy currents, lowers pressure loss when the oil passes through, and improves the energy utilization efficiency of the oil system.

[0024] The symmetrical structure of the cross-shaped ribs ensures that stress is evenly transmitted along the rib extension direction during the compression deformation (forward conduction) and elastic recovery (reverse sealing) of the elastic diaphragm, preventing excessive stretching or compression of the diaphragm due to localized stress concentration. Especially under high-frequency opening and closing conditions, it can reduce fatigue wear at the contact points between the diaphragm and the supporting ribs, extending the service life of the elastic diaphragm.

[0025] Furthermore, a filter screen is provided between the supporting rib and the elastic component, and the filter screen is fixed to the inner wall of the through hole.

[0026] Beneficial effects: The filter in this solution can directly filter impurities such as metal shavings, rubber particles, and oil sludge from the oil, preventing them from entering the mating area between the elastic diaphragm and the support ribs. This prevents impurities from getting stuck in the diaphragm gaps or cross openings, avoiding leakage caused by the diaphragm not closing completely due to foreign objects blocking it. It also reduces scratches on the diaphragm surface caused by impurities, protecting the integrity of the sealing surface of the elastic components. It is especially suitable for scenarios where impurities are easily generated, such as oil circulation systems.

[0027] Furthermore, the supporting ribs, filter screen, and elastic components are all integrally formed with the skeleton.

[0028] Beneficial effects: This design ensures a more stable rigid connection between the support ribs and the frame, a tighter bond between the filter screen and the inner wall of the through holes, and a significantly improved connection strength between the elastic components and the frame. It can withstand long-term hydraulic pressure impacts and high-frequency deformations, greatly enhancing the fatigue resistance of the overall structure. Furthermore, this connection method reduces assembly steps, significantly improving production efficiency and lowering manufacturing costs.

[0029] Furthermore, the skeleton is a rotating structure, and multiple oil passage holes are provided, which are evenly distributed along the circumference of the skeleton.

[0030] Beneficial effects: In this design, the symmetrical structure of the rotating frame and the circumferentially evenly distributed oil passages form a radially symmetrical oil flow path. During forward oil pressure impact, the oil can act evenly on the elastic diaphragm through each oil passage, ensuring that the elastic component is subjected to balanced force at all circumferential positions. This avoids the elastic component's skewing or uneven deformation caused by localized oil flow concentration, and ensures the synchronicity of the opening of the elastic component's gap. During reverse oil pressure reset, the evenly distributed oil passages make the reverse pressure on each part of the diaphragm more symmetrical.

[0031] Furthermore, multiple oil passages ensure that the oil entering the control valve is more evenly distributed.

[0032] Furthermore, the upper part of the frame is provided with mounting holes, which are blind holes.

[0033] Beneficial effect: The mounting hole in this design facilitates the installation of the entire check valve inside the control valve, providing installation space for the spring inside the control valve.

[0034] Furthermore, the bottom end of the frame is a mounting end face, the diameter of which is larger than the diameter of the frame, and the mounting end face is a plane.

[0035] Beneficial effects: With this design, the mounting end face is a planar structure, which results in higher assembly accuracy after being assembled into the control valve. The mounting end face can increase the contact area at the connection with the control valve, making the pressure distribution on the connection surface more uniform and reducing the deformation of the mounting surface caused by excessive local pressure. Attached Figure Description

[0036] The accompanying drawings, which are included to provide a further understanding of the embodiments of the present invention and form part of this application, do not constitute a limitation thereof. In the drawings:

[0037] Figure 1 This is a partial cross-sectional view of the closed elastic diaphragm in an embodiment of a diaphragm-type check valve in an oil control valve according to this utility model;

[0038] Figure 2 This is a perspective view of an embodiment of a diaphragm-type check valve in an oil control valve according to the present invention;

[0039] Figure 3 This is a schematic diagram showing the open state of the elastic diaphragm in an embodiment of a diaphragm-type check valve in an oil control valve according to this utility model.

[0040] Figure 4 This is a schematic diagram showing the state of the diaphragm-type check valve installed inside the control valve and with the elastic diaphragm open, in an embodiment of an oil control valve of this utility model.

[0041] Figure 5 This is a schematic diagram showing the state of the elastic diaphragm after it is closed in an embodiment of a diaphragm-type check valve in an oil control valve of this utility model.

[0042] Figure 6 This is a schematic diagram showing the state of the diaphragm-type check valve installed inside the control valve and with the elastic diaphragm closed, in an embodiment of an oil control valve according to this utility model.

[0043] The attached diagram shows the markings and corresponding component names:

[0044] 1. Frame, 101. Mounting end face, 2. Elastic diaphragm, 3. Filter screen, 4. Oil passage hole, 5. Through hole, 6. Support rib, 7. Control valve. Detailed Implementation

[0045] To make the objectives, technical solutions, and advantages of this utility model clearer, the present utility model will be further described in detail below with reference to the embodiments and accompanying drawings. The illustrative embodiments and descriptions of this utility model are only used to explain this utility model and are not intended to limit this utility model.

[0046] As one embodiment of this application, such as Figure 1 , Figure 2 and Figure 3 As shown, this embodiment provides a diaphragm-type check valve in an oil control valve, including a frame 1, an installation cavity inside the frame 1, an oil passage hole 4 communicating with the installation cavity on the frame 1, and a through hole 5 communicating with the installation cavity at the bottom of the frame 1; in this embodiment, the frame 1 is a rotating structure, and multiple oil passage holes 4 are provided. In this embodiment, four oil passage holes 4 are provided, and the four oil passage holes 4 are evenly distributed along the circumference of the frame 1.

[0047] like Figure 1 and Figure 3 As shown, in this embodiment, an elastic component is connected to the bottom of the mounting cavity. In this embodiment, the elastic component is fixedly connected to the inner wall of the through hole 5, as shown. Figure 2As shown, the through hole 5 is provided with a support rib 6 for supporting the elastic component. The elastic component can form an oil passage gap. When the elastic component is subjected to positive oil pressure impact, it will deform axially and open the oil passage gap to conduct. When the elastic component is subjected to reverse oil pressure impact, it will deform axially to reset or close the oil passage gap when the positive oil pressure is zero.

[0048] In one embodiment, such as Figure 1 and Figure 3 As shown, the elastic component includes an elastic diaphragm 2, and the oil passage gap is a cross-shaped opening at the center of the elastic diaphragm 2. Since the elastic diaphragm 2 is elastic, the opening and closing of the oil passage gap formed on the elastic diaphragm 2 is achieved by the impact of the positive or reverse oil pressure on the elastic diaphragm 2.

[0049] like Figure 3 As shown and Figure 4 As shown, when the elastic diaphragm 2 is subjected to positive oil pressure impact, it deforms axially, causing the cross opening to open. At this time, the elastic diaphragm 2 bends and arches towards the side wall of the mounting cavity of the skeleton 1. At this time, the cross opening is in an expanded and open state, and at this time, the oil can flow from the cross opening to the mounting cavity, and then flow into the control valve 7 from the four oil passages 4 around the mounting cavity.

[0050] like Figure 5 and Figure 6 As shown, when the elastic diaphragm 2 is subjected to reverse oil pressure impact and axially deforms and resets, or when the forward oil pressure is zero, the cross opening closes. The support rib 6 provides limiting support for the elastic diaphragm 2, preventing the elastic diaphragm 2 from bending and opening in the reverse direction. At this time, the elastic diaphragm 2 is in the closed state, blocking the oil. That is, when the forward oil pressure is zero, the elastic diaphragm 2 axially deforms back to the initial closed state. When subjected to reverse oil pressure impact, it will also reset and close in one direction.

[0051] In this embodiment, the elastic diaphragm 2 is a thin-walled rubber part. When the elastic diaphragm 2 is not subjected to positive pressure, the cross opening is kept closed naturally by the elastic tension of the elastic diaphragm 2 itself. The elastic diaphragm 2 is made of elastic materials such as thin-walled rubber, and the edges of the cross opening are tightly fitted during manufacturing (similar to an unopened crack).

[0052] If subjected to reverse oil pressure, such as Figure 5 and Figure 6 As shown, the pressure will further press the opening edge together, enhancing the sealing effect and blocking the flow of oil.

[0053] When positive oil pressure is applied to elastic diaphragm 2, such as Figure 3 and Figure 4 As shown, the pressure overcomes the elastic tension of the elastic diaphragm 2, forcing the elastic diaphragm 2 to undergo axial deformation and expand upwards.

[0054] The deformation of the elastic diaphragm 2 stretches the edges of the cross opening outwards, causing the originally closed opening to be stretched open and forming a connected channel. The greater the oil pressure, the more obvious the diaphragm deformation, and the greater the opening of the cross opening, allowing the oil to flow smoothly through the opening.

[0055] In one embodiment, the elastic component includes four elastic diaphragms 2, each being a thin-walled rubber component. The four elastic diaphragms 2 are circumferentially distributed and their adjacent edges are fitted together to form an initially closed oil passage gap. When the four elastic diaphragms 2 are subjected to a positive oil pressure impact and undergo axial deformation, the oil passage gap between adjacent elastic diaphragms 2 opens. At this time, the four elastic diaphragms 2 arch upwards towards the mounting cavity, causing adjacent elastic diaphragms to separate and form a gap. At this time, oil can pass through and enter the control valve 7. When the four elastic diaphragms 2 are subjected to a reverse oil pressure impact and undergo axial deformation reset, or when the positive oil pressure is zero, the edges of adjacent elastic diaphragms 2 re-fit together, thereby closing the oil passage gap between adjacent elastic diaphragms 2 and realizing unidirectional oil entry.

[0056] The check valve in this invention uses a rubber diaphragm 2, which has a fast response, low opening pressure, and high reliability for reverse sealing.

[0057] In one embodiment, such as Figure 2 As shown, in this embodiment, the support rib 6 is a cross rib. In this embodiment, the end of the cross rib is fixedly connected to the inner wall of the through hole 5 of the skeleton 1. The cross rib and the inner wall of the through hole 5 form four fan-shaped channels, which can not only avoid affecting the smooth flow of oil, but also support and limit the elastic diaphragm 2.

[0058] In one embodiment, such as Figure 1 and Figure 2 As shown, in this embodiment, a filter screen 3 is also provided between the support rib 6 and the elastic component, and the filter screen 3 is fixed to the inner wall of the through hole 5. In this embodiment, the support rib 6, the filter screen 3, and the elastic component are all integrally formed with the frame 1, that is, the support rib 6, the elastic diaphragm 2, and the filter screen 3 are all injection molded and fixed in the frame 1 to form a one-way valve assembly.

[0059] In one embodiment, the upper part of the skeleton 1 is provided with a mounting hole, and the mounting hole is a blind hole, combined with Figure 4 As shown, when the check valve in this embodiment is installed inside the control valve 7, the spring assembly inside the control valve 7 can be installed in the mounting hole of the frame 1, and the mounting hole provides a mounting space for the spring assembly inside the control valve 7.

[0060] In addition, combined Figure 1 and Figure 2 As shown, in this embodiment, the bottom end of the frame 1 is a mounting end face 101. The diameter of the mounting end face 101 is larger than the diameter of the frame 1, and the mounting end face 101 is a plane. Figure 4 and Figure 6 As shown, when the check valve in this embodiment is installed inside the control valve 7, since the mounting end face 101 is flat, it provides a stable mounting end face 101 for the installation of the check valve and can improve the assembly accuracy with the bottom of the control valve 7. At the same time, since the diameter of the mounting end face 101 is larger than the diameter of the skeleton 1 in this embodiment, it can ensure that a gap for oil to pass through is formed between the skeleton 1 and the inner wall of the control valve 7 after the check valve is installed, thereby ensuring the smooth flow of oil.

[0061] The working principle of this utility model is as follows: Figure 3 and Figure 4 As shown, positive oil pressure enters the through hole 5 from the bottom of the check valve and impacts the elastic diaphragm 2, causing the rubber elastic diaphragm 2 to deform axially and bend towards the inner wall of the mounting cavity, achieving one-way flow. The oil then enters the control valve 7 from the four oil passages 4 on one side of the mounting cavity of the skeleton 1.

[0062] like Figure 5 and Figure 6 As shown, when the forward oil pressure is zero, the rubber elastic diaphragm 2 deforms axially back to its initial state, which is the closed state, blocking the flow of oil. When the elastic diaphragm 2 is impacted by the reverse oil pressure inside the control valve 7, the elastic diaphragm 2 deforms in the reverse direction, thus achieving one-way closure and blocking the leakage of oil.

[0063] It should be noted that the above description of the disclosed embodiments enables those skilled in the art to implement or use this application. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the scope of this application. Therefore, this application is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A diaphragm-type check valve in an oil control valve, characterized in that, The device includes a frame with a mounting cavity inside. An oil passage hole communicating with the mounting cavity is formed on the frame, and a through hole communicating with the mounting cavity is formed at the bottom of the frame. An elastic component is connected to the bottom of the mounting cavity, and a support rib for supporting the elastic component is provided in the through hole. The elastic component can form an oil passage gap. When subjected to positive oil pressure impact, the elastic component undergoes axial deformation, opening the oil passage gap for conduction. When subjected to reverse oil pressure impact, the elastic component undergoes axial deformation and resets, or when the positive oil pressure is zero, the oil passage gap closes and blocks.

2. The diaphragm-type check valve in an oil control valve according to claim 1, characterized in that, The elastic component includes an elastic diaphragm, and the oil passage gap is a cross-shaped opening at the center of the elastic diaphragm; when the elastic diaphragm is subjected to a positive oil pressure impact, it deforms axially, causing the cross-shaped opening to open; when the elastic diaphragm is subjected to a reverse oil pressure impact, it deforms axially to reset, or when the positive oil pressure is zero, it causes the cross-shaped opening to close.

3. The diaphragm-type check valve in an oil control valve according to claim 1, characterized in that, The elastic component includes multiple elastic diaphragms, which are circumferentially distributed and have adjacent edges that adhere to each other to form an initially closed oil passage gap. When the multiple elastic diaphragms are subjected to positive oil pressure impact and undergo axial deformation, the oil passage gap between adjacent elastic diaphragms opens. When the multiple elastic diaphragms are subjected to reverse oil pressure impact and undergo axial deformation reset, or when the positive oil pressure is zero, the edges of adjacent elastic diaphragms re-adhere to each other, thereby closing the oil passage gap between adjacent elastic diaphragms.

4. The diaphragm-type check valve in an oil control valve according to claim 2 or 3, characterized in that, The elastic diaphragm is a thin-walled rubber component.

5. The diaphragm-type check valve in an oil control valve according to claim 1, characterized in that, The supporting reinforcement is a cross-shaped reinforcement.

6. The diaphragm-type check valve in an oil control valve according to claim 1, characterized in that, A filter screen is also provided between the supporting rib and the elastic component, and the filter screen is fixed to the inner wall of the through hole.

7. The diaphragm-type check valve in an oil control valve according to claim 6, characterized in that, The supporting ribs, filter screen, and elastic components are all integrally formed with the skeleton.

8. A diaphragm-type check valve in an oil control valve according to any one of claims 1-3 or 5-7, characterized in that, The frame is a rotating structure, and there are multiple oil passage holes, which are evenly distributed along the circumference of the frame.

9. A diaphragm-type check valve in an oil control valve according to any one of claims 1-3 or 5-7, characterized in that, The upper part of the frame has mounting holes, which are blind holes.

10. The diaphragm-type check valve in an oil control valve according to claim 9, characterized in that, The bottom end of the frame is a mounting end face, the diameter of which is larger than the diameter of the frame, and the mounting end face is a plane.

Images