Movable iron core, valve element assembly and electromagnetic valve

Abstract

The utility model provides a movable iron core, the movable iron core is used for a valve core assembly, the valve core assembly comprises a static iron core and a movable iron core capable of being magnetically coupled with the static iron core, the movable iron core comprises a first end away from the static iron core and a second end opposite to the first end, sealing rubber is arranged at the first end, and the sealing rubber is arranged at the second end of the static iron core. The first end comprises a first concave part with a stop structure, and the sealing rubber is embedded in the first concave part and is kept in position by the stop structure. The utility model further provides a valve element assembly comprising the movable iron core and an electromagnetic valve comprising the movable iron core. By using the movable iron core provided by the invention, the reliability of connection between the sealing rubber and the first concave part is improved.

Description

Technical Field

[0001] This utility model relates to the field of electromagnetic control, and in particular to a moving iron core, a valve core assembly including the moving iron core, and an electromagnetic valve for an electronic braking system of a vehicle including the valve core assembly. Background Technology

[0002] In commercial vehicles, the Electronic Braking System (EBS) is a crucial component. It precisely controls the vehicle's braking force electronically, balancing the difference in braking force between the front and rear wheels, thereby significantly improving the vehicle's braking performance, safety, and stability. One of the key components in EBS that enables its braking function is the solenoid valve. The solenoid valve regulates the braking force by controlling the pressure in the brake chamber or hydraulic cylinder, thus fulfilling the braking force control commands issued by the EBS's electronic control unit.

[0003] A solenoid valve typically includes a valve core assembly and a nozzle. When a coil in the valve core assembly is energized, the stationary iron core within the assembly is magnetized, thereby controlling the movement of the moving iron core, which in turn seals or opens the nozzle. Rubber blocks are located at both ends of the moving iron core. The rubber block on the side opposite the nozzle seals the nozzle, while the rubber block on the side opposite the stationary iron core reduces the impact force (shock absorption) when the moving iron core collides with the stationary iron core, thus preventing damage to the iron core.

[0004] Typically, the two rubber blocks are individually vulcanized and bonded to the iron core. However, this process is not only time-consuming and labor-intensive but also uneconomical. Furthermore, the reliability of this structure is relatively low; during actual operation of the solenoid valve, problems such as the rubber blocks falling off frequently occur, leading to valve failure.

[0005] The same or similar problems exist in solenoid valves used in other fields.

[0006] Therefore, it is necessary to propose a new moving iron core, a valve core assembly including the moving iron core, and a solenoid valve including the valve core assembly. Utility Model Content

[0007] The purpose of this application is to provide a moving iron core, a valve core assembly including the moving iron core, and a solenoid valve including the valve core assembly, so as to solve at least one problem existing in the prior art.

[0008] According to one aspect of this application, a moving iron core is provided for use in a valve core assembly, the valve core assembly comprising: the moving iron core and a stationary iron core capable of magnetically coupling with the moving iron core, the moving iron core including a first end remote from the stationary iron core and a second end opposite to the first end, a sealing rubber being provided at the first end, wherein the first end includes a first recess having a stop structure, the sealing rubber being embedded in the first recess and held in place by the stop structure.

[0009] In one embodiment, the first recess includes a bottom, a side surrounding the bottom, and a stop portion extending from the side as the stop structure, the stop portion being configured to prevent the sealing rubber from dislodging from the recess.

[0010] In one embodiment, the stop is provided over the entire circumference of the side portion.

[0011] In one embodiment, the first recess includes a bottom and a side portion surrounding the bottom, the side portion being inclined inward relative to the bottom such that the area of ​​the bottom of the first recess is smaller than the cross-sectional area at the outlet of the first recess as the stop structure.

[0012] In one embodiment, the sealing rubber includes a first protrusion that protrudes from the first recess when the sealing rubber is embedded in the first recess.

[0013] In one embodiment, the sealing rubber further includes a second protrusion opposite to the first protrusion.

[0014] In one embodiment, the bottom has a circular shape, and the sealing rubber includes a connecting portion that connects the first protrusion and the second protrusion, wherein the first protrusion, the second protrusion, and the connecting portion have a cylindrical shape.

[0015] In one embodiment, the sealing rubber includes at least one groove extending through the first protrusion, the second protrusion, and the connecting portion in a stacking direction of the first protrusion, the second protrusion, and the connecting portion.

[0016] In one embodiment, a shock-absorbing rubber is provided at the second end, the second end including a second recess, the shock-absorbing rubber being embedded in the second recess and a portion of the shock-absorbing rubber being located outside the second recess.

[0017] In one embodiment, the damping rubber has a frustum shape.

[0018] Another aspect of this application provides a valve core assembly, the valve core assembly including a stationary iron core, a moving iron core of this application, and a coil surrounding the stationary iron core.

[0019] Another aspect of this application provides a solenoid valve including a valve core assembly and a nozzle, the valve core assembly being configured to cooperate with the nozzle to seal the outlet of the nozzle, wherein the valve core assembly includes the moving iron core of this application.

[0020] By using the moving iron core according to this application, the cost of manufacturing the moving iron core is reduced and the process steps are reduced. On the other hand, the reliability of the connection between the sealing rubber and the first recess is improved, and the maintenance and replacement of the moving iron core and the sealing rubber are facilitated. Attached Figure Description

[0021] Exemplary embodiments of this application will now be described in detail with reference to the accompanying drawings. It should be understood that the embodiments described below are for illustrative purposes only and are not intended to limit the scope of this application.

[0022] In the picture:

[0023] Figure 1 A cross-sectional view of a moving iron core according to an exemplary embodiment of this application is shown;

[0024] Figure 2 It shows Figure 1 An enlarged view of a portion of the moving iron core;

[0025] Figure 3 A perspective view of a sealing rubber according to an embodiment of this application is shown; and

[0026] Figure 4 A perspective view of a shock-absorbing rubber according to an embodiment of this application is shown. Detailed Implementation

[0027] Preferred embodiments of this application are described in detail below with reference to examples. In the embodiments of this application, a solenoid valve for an EBS system in a vehicle is used as an example for description. However, those skilled in the art should understand that these exemplary embodiments do not imply any limitation on this application. Furthermore, features in the embodiments of this application can be combined with each other unless otherwise specified. In different drawings, the same components are indicated by the same reference numerals, and other components are omitted for brevity, but this does not mean that the moving iron core, valve core assembly, or solenoid valve of this application cannot include other components. It should be understood that the dimensions, proportions, and number of components in the drawings are not intended to limit this application.

[0028] It will be understood that although the terms “first,” “second,” etc., may be used herein to describe various elements, these elements should not be limited by these terms. These terms are used only to distinguish one element from another. For example, a first element may be referred to as a second element, and similarly, a second element may be referred to as a first element, without departing from the scope of this application.

[0029] Figure 1 A cross-sectional view of a moving iron core 100 according to an exemplary embodiment of this application is shown. Figure 2 It shows Figure 1 An enlarged view of a portion of the moving iron core 100.

[0030] The moving iron core 100 according to an exemplary embodiment of this application is part of a valve core assembly, which also includes a stationary iron core (not shown). One end of the stationary iron core typically has a shape that mates with one end of the moving iron core 100, such that the moving iron core 100 and the stationary iron core can be stably engaged together when the solenoid valve is in operation. This valve core assembly can be used in a solenoid valve, such as the solenoid valve of an EBS in a vehicle. Such a solenoid valve includes a valve core assembly and a nozzle (not shown), the valve core assembly being configured to mate with the nozzle to seal the outlet of the nozzle. Thus, when the outlet is sealed, the inlet and outlet of the solenoid valve are spaced apart and in an open state. Furthermore, the valve core assembly also includes at least a coil (not shown) surrounding the stationary iron core for providing a magnetic field when energized, thereby enabling the movement of the moving iron core and thus controlling the on / off state of the solenoid valve. The coil may optionally be mounted directly on the stationary iron core, or alternatively supported and arranged by additional components. When the coil is energized, a magnetic field is generated at the coil, causing magnetic coupling between the moving iron core and the stationary iron core. The moving iron core is attracted by the magnetic field and moves to engage with the stationary iron core. In this way, the seal of the moving iron core at the outlet is broken, and the inlet and outlet of the solenoid valve are fluidly connected and thus in a connected state.

[0031] To achieve the aforementioned seal, the most common practice is to place a sealing rubber on the first end 101 of the moving iron core 100 that mates with the nozzle (that is, the first end is away from the stationary iron core and close to the nozzle). The sealing rubber is elastic, allowing the moving iron core and the nozzle outlet to still achieve a seal even with slight deformation or misalignment. Furthermore, the sealing rubber also protects the outlet and the first end of the moving iron core from rigid collisions that could cause damage.

[0032] like Figure 1 and Figure 2As shown, in an embodiment of this application, the first end 101 of the moving iron core 100 of the valve core assembly has a first recess 110, and the sealing rubber 200 is embedded in the first recess 110. The first recess 110 is additionally provided with a stop structure, preventing the sealing rubber 200 from coming out of the first recess 110 when the solenoid valve is operating. Various stop structures can be used to prevent the sealing rubber 200 from coming out of the first recess 110, which will be described in detail below. By designing the first recess 110 at the first end 101 of the moving iron core 100 and embedding the sealing rubber 200 therein, the complex rubber vulcanization process is avoided, greatly simplifying the manufacturing process of the moving iron core 100 and reducing manufacturing costs. Meanwhile, by changing the chemical connection to a physical connection, reliability issues caused by the vulcanization process are avoided, making the connection between the sealing rubber 200 and the moving iron core 100 more reliable. When the sealing rubber 200 is damaged, it can be replaced simply by disassembling the sealing rubber 200 without replacing the entire moving iron core 100, which greatly facilitates the maintenance of the solenoid valve and saves the cost of maintaining the solenoid valve.

[0033] Preferably, the first recess 110 includes a bottom 111, a side portion 112 surrounding the bottom, and a stop portion 113 extending from the side portion. In such an embodiment, the stop portion 113 serves as a stop structure to prevent the sealing rubber 200 from dislodging from the first recess 110. The stop portion 113 may mate with at least a portion of the shape of the sealing rubber 200, thereby increasing the reliability of the stop. In this way, the stop portion 113 can effectively restrict the movement of the sealing rubber 200, thereby removably securing the sealing rubber 200 within the first recess 110.

[0034] More preferably, the stop portion 113 can be provided on the entire circumference of the side portion 112. In this way, the stop portion 113 can contact the sealing rubber 200 in the entire circumferential direction, thereby increasing the reliability of the connection between the sealing rubber 200 and the moving iron core 100.

[0035] Alternatively, the first recess 110 may consist only of a bottom 111 and a side portion 112 surrounding the bottom 111. In such an embodiment, the side portion 112 is inclined inward relative to the bottom 111 such that the area of ​​the bottom 111 of the first recess 110 is smaller than the cross-sectional area at the outlet of the first recess 110, so that when the sealing rubber 200 is embedded in the first recess 110, the side portion 112 can prevent the sealing rubber 200 from falling out of the first recess 110, thus acting as a stop structure. It is conceivable that the first recess 110 should have a cross-sectional area larger than the cross-sectional area at the outlet, so that the first recess 110 will never fall out of it under any circumstances. The first recess 110 designed in this way has a relatively simple structure and can effectively prevent the stop structure from being damaged after the solenoid valve has been used for a long time.

[0036] Figure 3 A perspective view of a sealing rubber 200 according to an embodiment of this application is shown.

[0037] like Figure 3 As shown, the sealing rubber 200 includes a first protrusion 210. The first protrusion 210 may be provided with a shape (not shown) that mates with the nozzle outlet, thereby enhancing the seal between the moving iron core 100 and the nozzle. Further, when the sealing rubber 200 is embedded in the first recess 110, the first protrusion 210 preferably protrudes from the first recess 110 (see...). Figure 2 This allows for a larger buffer distance between the moving iron core 100 and the nozzle outlet, thereby preventing the moving iron core 100 from directly contacting the nozzle and causing damage to the moving iron core 100 or the nozzle.

[0038] To facilitate the insertion of the sealing rubber 200 into the first recess 110, the sealing rubber 200 may also include a second protrusion 220 opposite to the first protrusion 210. The first protrusion 210 and the second protrusion 220 may have the same shape and size for ease of use. Alternatively, the first protrusion 210 and the second protrusion 220 may have different shapes and sizes to reduce the cost of manufacturing the sealing rubber. In general, the size and shape of the second protrusion 220 can be arbitrary and need to be selected based on the actual usage environment and manufacturing process.

[0039] Typically, a solenoid valve as a whole is shaped like a rotating body, and each component within it (nozzle, moving iron core, stationary iron core, etc.) is also shaped like a rotating body. Furthermore, the nozzle outlet is a cylindrical channel. Therefore, preferably, the first protrusion 210 and the second protrusion 220 of the sealing rubber 200 are both cylindrical in shape to ensure uniform stress distribution in all directions. Additionally, at least a connecting portion 230 is included between the first protrusion 210 and the second protrusion 220, connecting the first protrusion 210 and the second protrusion 220, and preferably abutting against the side 112 of the first recess 110 to increase the reliability of the connection between the sealing rubber 200 and the moving iron core 100. More preferably, the bottom 111 of the first recess 110 has a circular shape, and the connecting portion 230 of the sealing rubber 200 has a cylindrical shape.

[0040] During the process of embedding the sealing rubber, the embedding process reduces the gap in the first recess, causing the air in the first recess to be compressed, making the embedding process difficult and difficult to embed into the ideal position. Therefore, at least one groove 240 is also provided on the sealing rubber 200. The groove 240 extends through the first protrusion 210, the second protrusion 220 and the connecting portion 230 in the stacking direction of the first protrusion 210, the second protrusion 220 and the connecting portion 230 (in the illustrated embodiment, in the axial direction of the sealing rubber), thereby venting air out of the gap. More preferably, as Figure 2 As shown, a groove can also be provided on the bottom 111.

[0041] Back Figure 1 As can be seen, in addition to the sealing rubber 200 provided at the first end 101 of the moving iron core 100, a shock-absorbing rubber 300 is also provided at the second end 102 opposite to the first end 101. Preferably, the second end 102 includes a second recess 120, and the shock-absorbing rubber 300 is embedded in the second recess 120 with a portion of the shock-absorbing rubber 300 located outside the second recess 120. In this way, when the solenoid valve changes from the cut-off state to the connected state, the shock-absorbing rubber 300 can effectively absorb the impact force between the moving iron core 100 and the stationary iron core, protecting both the moving iron core 100 and the stationary iron core. Furthermore, due to the provision of the second recess 120, the shock-absorbing rubber 300 can also be reliably fixed at the second end 102, and can be easily disassembled when the shock-absorbing rubber needs to be replaced or repaired.

[0042] like Figure 4 As shown, the damping rubber 300 can have a frustum shape. Correspondingly, the second recess 120 can also be formed as a similar frustum-shaped recessed space. Through this mating method, the damping rubber 300 will be reliably stopped within the second recess 120. The specific principle is similar to the mating of the first recess 110 and the sealing rubber 200, and therefore will not be described in detail here. However, it is conceivable that the shape of the damping rubber 300 is not limited to this. The damping rubber can have the exact same structure and shape as the sealing rubber, thereby facilitating manufacturing.

[0043] The above embodiments of this application provide a moving iron core. According to the technical solution of this application, by providing a first recess including a stop structure at the first end of the moving iron core and embedding sealing rubber within the first recess, a mechanical connection is established between the first recess and the sealing rubber, rather than a chemical connection. This reduces the cost of manufacturing the moving iron core and decreases the number of process steps. Furthermore, it improves the reliability of the connection between the sealing rubber and the first recess, while also facilitating the maintenance and replacement of the moving iron core and the sealing rubber.

[0044] According to another aspect of this application, a valve core assembly is provided, the valve core assembly including a stationary iron core, a moving iron core and a coil surrounding the stationary iron core, wherein the moving iron core is the moving iron core according to any one of the preceding claims.

[0045] According to another aspect of this application, a solenoid valve is provided, the solenoid valve including a valve core assembly and a nozzle, the valve core assembly being configured to cooperate with the nozzle to seal the nozzle outlet, wherein the valve core assembly includes a moving iron core as described in any of the above embodiments.

[0046] By using a moving iron core with a first recess including a stop structure at the first end and a sealing rubber embedded in the first recess, the cost of manufacturing valve core assembly and solenoid valve is reduced, the number of manufacturing process steps of valve core assembly and solenoid valve is reduced, the reliability of valve core assembly and solenoid valve is improved, and maintenance of valve core assembly and solenoid valve is facilitated.

[0047] The present application has been described in detail above with reference to specific embodiments. Obviously, the above description and the embodiments shown in the accompanying drawings should be understood as exemplary and not as limiting the present application. Those skilled in the art can make various modifications or alterations without departing from the spirit of the present application, and such modifications or alterations do not depart from the scope of the present application.

Claims

1. A moving iron core (100), said moving iron core being used in a valve core assembly, said valve core assembly comprising: The moving iron core and the stationary iron core capable of magnetic coupling with the moving iron core, the moving iron core including a first end (101) away from the stationary iron core and a second end (102) opposite to the first end, a sealing rubber (200) is provided at the first end, characterized in that the first end includes a first recess (110) with a stop structure, the sealing rubber being embedded in the first recess and held in place by the stop structure.

2. The moving iron core according to claim 1, characterized in that, The first recess includes a bottom (111), a side (112) surrounding the bottom, and a stop portion (113) extending from the side as the stop structure, the stop portion being configured to prevent the sealing rubber from coming out of the recess.

3. The moving iron core according to claim 2, characterized in that, The stop portion is provided on the entire circumference of the side portion.

4. The moving iron core according to claim 1, characterized in that, The first recess includes a bottom and a side portion surrounding the bottom, the side portion being inclined inward relative to the bottom such that the area of ​​the bottom of the first recess is smaller than the cross-sectional area at the outlet of the first recess, thus serving as the stop structure.

5. The moving iron core according to any one of claims 1 to 4, characterized in that, The sealing rubber includes a first protrusion (210) that protrudes from the first recess when the sealing rubber is embedded in the first recess.

6. The moving iron core according to claim 5, characterized in that, The sealing rubber also includes a second protrusion (220) opposite to the first protrusion.

7. The moving iron core according to claim 6, characterized in that, The bottom of the first recess has a circular shape, and the sealing rubber includes a connecting portion (230) that connects the first protrusion and the second protrusion. The first protrusion, the second protrusion and the connecting portion have a cylindrical shape.

8. The moving iron core according to claim 7, characterized in that, The sealing rubber includes at least one groove (240) that extends through the first protrusion, the second protrusion and the connecting portion in the stacking direction of the first protrusion, the second protrusion and the connecting portion.

9. The moving iron core according to claim 1 or 8, characterized in that, A shock-absorbing rubber (300) is provided at the second end, the second end including a second recess (120), the shock-absorbing rubber is embedded in the second recess and a portion of the shock-absorbing rubber is located outside the second recess.

10. The moving iron core according to claim 9, characterized in that, The shock-absorbing rubber has a frustum shape.

11. A valve core assembly, the valve core assembly comprising a stationary iron core, a moving iron core, and a coil surrounding the stationary iron core, characterized in that, The moving iron core is the moving iron core (100) according to any one of claims 1-10.

12. A solenoid valve comprising a valve core assembly and a nozzle, the valve core assembly being configured to cooperate with the nozzle to seal the outlet of the nozzle, characterized in that, The valve core assembly includes a moving iron core (100) according to any one of claims 1 to 10.

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