Moving iron core assembly, solenoid valve, and electric brake system

Abstract

The present application relates to a moving iron core assembly for a solenoid valve, the solenoid valve comprising an electromagnetic coil, a stationary iron core assembly and a moving iron core assembly, the stationary iron core assembly being associated with the electromagnetic coil, the moving iron core assembly being magnetically cooperating with the stationary iron core assembly and being movable relative to the stationary iron core assembly under the action of a magnetic field generated by the electromagnetic coil, the moving iron core assembly comprising a moving iron core body (1) having a receiving cavity (121) and an opening (122) leading to the receiving cavity (121), and a seal (2) as a separate piece, the seal (2) being embedded assembled into the receiving cavity (121) of the moving iron core body (1) and exposed from the opening (122). By the present application, the moving iron core assembly of the solenoid valve can be realized in a cost-advantageous and simple-to-manufacture manner. In addition, the present application also relates to a corresponding solenoid valve and a corresponding commercial vehicle electrical brake system.

Description

Technical Field

[0001] This application relates to a moving iron core assembly for a solenoid valve, a corresponding solenoid valve, and an electric braking system for commercial vehicles. Background Technology

[0002] Solenoid valves, especially normally open valves, are the most critical components of the Electronic Braking System (EBS) in commercial vehicles. Inside the solenoid valve, the moving iron core, stationary iron core, and electromagnetic coil form a magnetic flux circuit. The stationary iron core is connected to the electromagnetic coil, and the moving iron core, under the influence of the magnetic field generated by the electromagnetic coil, magnetically engages with the stationary iron core and moves relative to it. Therefore, when the electromagnetic coil is energized, it generates a magnetic field. Under the influence of this field, the stationary iron core is magnetized, creating a magnetic attraction force that allows the moving iron core to move relative to it. Thus, by switching the current on and off, the moving iron core can be raised or lowered relative to the stationary iron core, thereby opening and closing the solenoid valve. Therefore, the reliability design of the moving iron core is crucial.

[0003] The solenoid valve also features a rubber seal mounted on a moving iron core that moves with it, engaging with a passage in the valve seat. Taking a normally open valve as an example, in the unenergized state, the valve is open, the seal is away from the passage inlet, and fluid can flow freely. When the solenoid coil is energized, a magnetic field is generated. The moving iron core causes the seal to move relative to the stationary iron core, overcoming the spring force. This causes the seal to fit tightly against the valve seat, sealing the passage inlet and blocking the fluid flow. When the solenoid coil is de-energized, the magnetic field disappears, the spring force returns the moving iron core to its original position, the seal separates from the valve seat, the valve reopens, and fluid flows again.

[0004] Currently, the manufacturing process of moving iron cores typically involves placing the raw material for rubber seals into the cavity within the moving iron core, followed by a vulcanization process to integrally mold the metal body of the moving iron core with the rubber seals. However, this manufacturing method and the products produced as a result have shortcomings in terms of cost and reliability. Therefore, it is necessary to propose an improvement plan. Utility Model Content

[0005] According to a first aspect of this application, a moving iron core assembly for a solenoid valve is provided. The solenoid valve includes an electromagnetic coil forming a magnetic flux loop, a stationary iron core assembly, and a moving iron core assembly. The stationary iron core assembly is connected to the electromagnetic coil. The moving iron core assembly moves relative to the stationary iron core assembly under the action of a magnetic field generated by the electromagnetic coil, magnetically engaging with the stationary iron core assembly. The moving iron core assembly includes: a moving iron core body having a receiving cavity and an opening leading to the receiving cavity; and a seal as a separate component, the seal being embedded in the receiving cavity of the moving iron core body and protruding from the opening.

[0006] According to an alternative embodiment of this application, the seal is press-fitted into the receiving cavity via the opening.

[0007] According to an alternative embodiment of this application, the seal is a molded rubber part.

[0008] According to an alternative embodiment of this application, the moving core body has a rod-shaped portion and an end portion extending along its longitudinal central axis, the end portion having a wall portion defining the receiving cavity and the opening, the wall portion being configured to hold the seal in the receiving cavity in the direction of the longitudinal central axis of the moving core body.

[0009] According to an alternative embodiment of this application, the wall portion has an inner meandering profile, and the circumferential profile of the seal is complementary to the inner meandering profile of the wall portion to form a shape fit.

[0010] According to an alternative embodiment of this application, the wall portion has a protrusion on its inner side extending toward the longitudinal central axis of the moving iron core body.

[0011] According to an optional embodiment of this application, the vertical distance of the protrusion relative to the longitudinal central axis of the moving iron core body first decreases and then increases in the direction from the opening toward the receiving cavity.

[0012] According to an optional embodiment of this application, the seal includes a first portion and a second portion that are generally cylindrical, the longitudinal central axes of the first portion and the second portion being collinear, and the radial dimension of the first portion being greater than the radial dimension of the second portion.

[0013] According to an optional embodiment of this application, the seal further includes a third portion disposed opposite to the second portion at the other end of the first portion, the second portion and the third portion having the same structure, such that the seal is formed as a component that is mirror-symmetrical with respect to its transverse central axis.

[0014] According to an alternative embodiment of this application, the seal further includes at least one recess arranged circumferentially and extending generally axially, the recess serving as a gas passage connecting the receiving cavity to the outside of the moving iron core assembly.

[0015] According to an optional embodiment of this application, the seal has a plurality of recesses arranged at equal intervals along the circumferential direction.

[0016] According to an alternative embodiment of this application, the recess extends axially through the seal.

[0017] According to an alternative embodiment of this application, the recess is formed as part of an axially extending cylinder.

[0018] According to a second aspect of this application, a solenoid valve is provided, the solenoid valve comprising: an electromagnetic coil constituting a magnetic flux circuit, a stationary iron core assembly, and a moving iron core assembly according to any one of the present application, the stationary iron core assembly being connected to the electromagnetic coil, the moving iron core assembly being magnetically engaged with the stationary iron core assembly under the action of the magnetic field generated by the electromagnetic coil and moving relative to the stationary iron core assembly; and a valve seat, the sealing member facing the valve seat through the opening of the moving iron core body.

[0019] According to a third aspect of this application, an electric braking system for a commercial vehicle is provided, the electric braking system including a solenoid valve according to this application.

[0020] This application enables the realization of the moving iron core assembly of a solenoid valve, as well as the corresponding solenoid valve and electric braking system, in a cost-effective and simple manufacturing manner.

[0021] It is worth noting that the advantages and beneficial effects of this application are not limited to those mentioned above. Those skilled in the art can understand other advantages and beneficial effects not mentioned in this application through the following detailed embodiments and claims. Attached Figure Description

[0022] The principles, features, and advantages of this application will be better understood below with reference to the accompanying drawings. In the drawings:

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

[0024] Figure 2 A perspective view of a seal according to an exemplary embodiment of this application is shown;

[0025] Figure 3 A partial cross-sectional view and a partial view of the moving iron core body according to an exemplary embodiment of this application are shown;

[0026] Figure 4 A perspective view of a seal according to another exemplary embodiment of this application is shown; and

[0027] Figure 5 It shows Figure 4 The front and top views of the seal.

[0028] List of reference numerals

[0029] 1. Moving iron core body

[0030] 11. Rod-shaped part

[0031] 12 ends

[0032] 121 Receiving cavity

[0033] 122 Opening

[0034] 123 Wall section

[0035] 124 Protrusion

[0036] 2. Seals

[0037] 21 Part 1

[0038] 22 Part Two

[0039] 23 Part Three

[0040] 24. Depression Detailed Implementation

[0041] To make the technical problems, technical solutions, and beneficial technical effects to be solved by this application clearer, the following will provide a more detailed description of this application in conjunction with the accompanying drawings and several exemplary embodiments. It should be understood that the specific embodiments described herein are only for explaining the principles of this application and are not intended to limit the scope of protection of this application. In the various drawings of this application, features with the same structure or function are indicated by the same reference numerals. The drawings are not drawn strictly to scale but are exaggerated for clarity.

[0042] Various embodiments of this application relate to a moving iron core assembly for a solenoid valve, a corresponding solenoid valve, and a corresponding electric braking system for a commercial vehicle.

[0043] like Figures 1-3 As shown, the moving iron core assembly according to this application includes a moving iron core body 1 and a seal 2 as a separate component. The moving iron core body 1 has a receiving cavity 121 and an opening 122 leading to the receiving cavity 121. The seal 2 is embedded into the receiving cavity 121 of the moving iron core body 1 and protrudes from the opening 122. Thus, the seal 2 can be manufactured separately and then assembled with the moving iron core body 1 as a separate component to form the moving iron core assembly. That is, the manufacturing process of the seal 2 and the assembly process with the moving iron core body 1 are separate. Therefore, the moving iron core assembly can be realized in a very simple and cost-effective manner.

[0044] Specifically, the seal 2 can be a molded rubber part. Alternatively or additionally, the seal 2 can be press-fitted into the receiving cavity 121 via the opening 122. Thus, by press-fitting and by means of the elasticity of the seal 2, the seal 2 can be easily assembled into the receiving cavity 121 and stably held.

[0045] Existing technologies employ a vulcanization process to integrally manufacture the moving iron core assembly. This requires placing the moving iron core body 1, filled with the raw materials for the seal 2, into a mold for manufacturing. This results in limited batch production, complex manufacturing due to large mold size, and high costs. The moving iron core body 1 also needs to participate in the vulcanization process. However, according to this application, since the seal 2 is manufactured independently by molding, it does not need to be integrally formed with the moving iron core body 1 through a vulcanization process. Therefore, it saves on vulcanization-related steps, equipment, and materials, thus saving costs; it simplifies the molds used and saves on mold costs; the moving iron core body 1 does not need to participate in the high-temperature treatment of the vulcanization process (vulcanization temperature is approximately 200 degrees Celsius); and it allows for mass production and assembly.

[0046] Furthermore, by using a molded rubber seal instead of a vulcanized rubber seal, the molded gate can be left on the end face of the seal. During the assembly of the seal 2 into the receiving cavity 121, the end face with the gate faces the receiving cavity 121 (inwards), thus achieving a better fit and sealing effect. Simultaneously, during the surface treatment (e.g., spraying) of the moving iron core body 1, there is no need to use a cover to cover the opening 122 or the end 12. This also gives the technical solution of this application a cost-effective advantage.

[0047] like Figure 3 As shown, the moving core body 1 has a rod-shaped portion 11 and an end portion 12 extending along its longitudinal central axis X. The end portion 12 has a wall portion 123 defining a receiving cavity 121 and an opening 122, the wall portion 123 being configured to hold the seal 2 within the receiving cavity 121 in the direction of the longitudinal central axis X of the moving core body 1. This ensures that the seal 2 will not detach from the moving core body 1 throughout the entire service life of the moving core assembly.

[0048] Preferably, the wall portion 123 may have an inner meandering profile, and the circumferential profile of the seal 2 is complementary to the inner meandering profile of the wall portion 123 to form a shape fit. In this way, the seal 2 can be stably retained simply by means of the shape fit without the need for additional complex retention structures.

[0049] Additionally or alternatively, such as Figure 3 As shown, the wall portion 123 may preferably have a protrusion 124 extending toward the longitudinal central axis X of the moving iron core body 1 on its inner side. The protrusion 124 is preferably implemented to extend along the entire inner circumference of the wall portion 123. For example... Figure 3As shown in the right-side view, from the opening 122 toward the receiving cavity 121, the vertical distance of the protrusion 124 relative to the longitudinal central axis X of the moving iron core body 1 first decreases and then increases. Thus, during the compression fitting of the seal 2 into the receiving cavity 121, initially, a larger gap near the outer side of the opening 122 facilitates the entry of the seal 2; then, a gradually decreasing gap guides the seal 2 into the receiving cavity 121; finally, the corner formed by the two parts with reversed gaps enhances the fixing effect on the seal 2 and improves the fit between the seal 2 and the receiving cavity 121 when it recovers after compression.

[0050] Preferably, such as Figure 2 As shown, the seal 2 may include a first portion 21 and a second portion 22, each being generally cylindrical. Specifically, the longitudinal central axes of the first portion 21 and the second portion 22 are collinear, and the radial dimension of the first portion 21 is larger than the radial dimension of the second portion 22. This allows for an axially symmetrical seal 2, providing uniform sealing in both the assembled and operational states. In the assembled state, the second portion 22 can form a form-fit with the protrusion 124. Thus, the dimensional difference between the first portion 21 and the second portion 22 can be used to create corresponding circumferential recesses in the seal 2 that mate with the protrusion 124. Figure 2 In the illustrated embodiment, the seal 2 is implemented as a two-part rubber component. Additionally, it is worth noting that... Figure 2 And the following Figure 5 In the diagram, the longitudinal center axis of the seal 2 is also marked with an X. That is to say, in the assembled state, the longitudinal center axis of the moving iron core body 1, the longitudinal center axis of the receiving cavity 121, and the longitudinal center axis of the seal 2 are preferably collinear with each other, which is very advantageous for the seal to provide uniform sealing performance.

[0051] Figure 4 and Figure 5 A seal 2 according to another embodiment of this application is shown. (With) Figure 2 The embodiment shown differs in that, in this embodiment, the seal 2 further includes a third portion 23 disposed opposite to the second portion 22 at the other end of the first portion 21, i.e., the seal 2 is implemented as a three-part rubber component. The second portion 22 and the third portion 23 can have the same structure, such that the seal 2 is formed as a component that is mirror-symmetrical with respect to its transverse central axis Y. This facilitates the picking up of the seal 2 during assembly and the alignment process relative to the moving iron core body, providing versatility.

[0052] Optionally, in some embodiments according to this application, the seal 2 may further include at least one recess 24 arranged circumferentially and extending generally axially (e.g., Figure 4 and Figure 5As shown, during the assembly of the seal 2 and the moving iron core body 1, the recess 24 can act as a gas passage connecting the receiving cavity 121 to the outside of the moving iron core assembly. This facilitates the discharge of gas from the receiving cavity 121 during assembly, thereby simplifying the assembly process.

[0053] Preferably, the seal 2 may have a plurality of recesses 24 arranged at equal intervals along the circumferential direction, such as Figure 4 and Figure 5 The four recesses 24 are evenly spaced along the circumferential direction, as shown. Furthermore, preferably, the recesses 24 can penetrate the seal 2 axially, i.e., as shown... Figure 4 and Figure 5 The recess 24 extends from one end face of the seal 2 to the opposite end face, as shown. Alternatively or additionally, the recess 24 may be formed as part of an axially extending cylinder, i.e., as... Figure 5 The seal 2 shown has a radius R1, and the recess 24 has a radius R2.

[0054] Embodiments of this application also relate to a solenoid valve including any of the aforementioned moving iron core assemblies. The solenoid valve includes: an electromagnetic coil forming a magnetic flux loop, a stationary iron core assembly, and a moving iron core assembly according to any of the present application, wherein the stationary iron core assembly is connected to the electromagnetic coil, and the moving iron core assembly moves relative to the stationary iron core assembly under the magnetic field generated by the electromagnetic coil in a magnetically coupled manner; and a valve seat, wherein the sealing member 2 faces the valve seat through an opening 122 in the moving iron core body 1.

[0055] The electromagnetic coil can be wound or sleeved on the stationary iron core assembly. The stationary iron core is fixed relative to the valve seat. Therefore, when the electromagnetic coil is energized, it generates a magnetic field. Under the action of the magnetic field, the stationary iron core assembly is magnetized and generates a magnetic attraction force on the moving iron core assembly. Under the action of this magnetic attraction force, the moving iron core assembly can move relative to the stationary iron core assembly. That is, the moving iron core assembly and the stationary iron core assembly form a magnetic engagement under the action of the magnetic field generated by the electromagnetic coil, thereby enabling the moving iron core assembly to move relative to the stationary iron core assembly and drive the sealing element 2 to move synchronously. This allows the sealing element 2 to selectively adhere to or press against the valve seat or move away from the valve seat to correspondingly close or open the solenoid valve. The solenoid valve may also include a reset mechanism such as a spring to reset the moving iron core assembly to its initial state when the electromagnetic coil is de-energized.

[0056] Here, the solenoid valve according to this application can be, in particular, a normally open valve, that is, in the initial state (when the solenoid coil is not energized), the moving iron core assembly and its seals are away from or do not contact the valve seat, and the solenoid valve is in the open state.

[0057] Embodiments of this application also relate to an electrical braking system for commercial vehicles that includes any of the aforementioned solenoid valves.

[0058] This application enables the realization of the moving iron core assembly of a solenoid valve, the corresponding solenoid valve, and the corresponding electric braking system for commercial vehicles in a cost-effective and simple manufacturing manner.

[0059] It is worth noting that in this document, the terms "first," "second," and "third," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance, nor should they be construed as implicitly specifying the number of technical features indicated. Features specified as "first," "second," or "third" may explicitly or implicitly indicate that at least one of those features is included.

[0060] Without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described herein, as well as the features of those different embodiments or examples. Various substitutions, modifications, and alterations can be conceived without departing from the spirit and scope of this application.

Claims

1. A moving iron core assembly for a solenoid valve, characterized in that, The solenoid valve includes an electromagnetic coil forming a magnetic flux circuit, a stationary iron core assembly, and a moving iron core assembly. The stationary iron core assembly is connected to the electromagnetic coil. Under the influence of the magnetic field generated by the electromagnetic coil, the moving iron core assembly magnetically engages with the stationary iron core assembly and moves relative to the stationary iron core assembly. The moving iron core assembly includes: The moving iron core body (1) has a receiving cavity (121) and an opening (122) leading to the receiving cavity (121); and As a separate component, the seal (2) is embedded in the receiving cavity (121) of the moving iron core body (1) and exposed from the opening (122).

2. The moving iron core assembly for a solenoid valve according to claim 1, characterized in that, The seal (2) is press-fitted into the receiving cavity (121) via the opening (122); and / or The seal (2) is a molded rubber part.

3. The moving iron core assembly for a solenoid valve according to claim 1 or 2, characterized in that, The moving core body (1) has a rod-shaped portion (11) and an end portion (12) extending along its longitudinal central axis (X), the end portion (12) having a wall portion (123) defining the receiving cavity (121) and the opening (122), the wall portion (123) being configured to hold the seal (2) in the receiving cavity (121) in the direction of the longitudinal central axis (X) of the moving core body (1).

4. The moving iron core assembly for a solenoid valve according to claim 3, characterized in that, The wall portion (123) has an inner meandering profile, and the circumferential profile of the seal (2) is complementary to the inner meandering profile of the wall portion (123) to form a shape fit; and / or The wall portion (123) has a protrusion (124) on its inner side extending toward the longitudinal central axis (X) of the moving iron core body (1).

5. The moving iron core assembly for a solenoid valve according to claim 4, characterized in that, From the opening (122) toward the receiving cavity (121), the vertical distance of the protrusion (124) relative to the longitudinal central axis (X) of the moving iron core body (1) first decreases and then increases.

6. The moving iron core assembly for a solenoid valve according to any one of claims 1, 2, 4, and 5, characterized in that, The seal (2) includes a first part (21) and a second part (22) that are generally cylindrical, the longitudinal central axes of the first part (21) and the second part (22) are collinear, and the radial dimension of the first part (21) is greater than the radial dimension of the second part (22).

7. The moving iron core assembly for a solenoid valve according to claim 6, characterized in that, The seal (2) further includes a third portion (23) disposed opposite to the second portion (22) at the other end of the first portion (21), the second portion (22) and the third portion (23) having the same structure, such that the seal (2) is formed as a component that is mirror-symmetrical with respect to its transverse central axis (Y); and / or The seal (2) further includes at least one recess (24) arranged circumferentially and extending generally axially, the recess (24) serving as a gas passage connecting the receiving cavity (121) to the outside of the moving iron core assembly.

8. The moving iron core assembly for a solenoid valve according to claim 7, characterized in that, The seal (2) has a plurality of recesses (24) arranged at equal intervals along the circumferential direction; and / or The recess (24) extends axially through the seal (2); and / or The recess (24) is formed as part of a cylinder extending axially.

9. A solenoid valve, characterized in that, The solenoid valve includes: An electromagnetic coil constituting a magnetic flux circuit, a stationary iron core assembly, and a moving iron core assembly according to any one of claims 1-8, wherein the stationary iron core assembly is connected to the electromagnetic coil, and the moving iron core assembly moves relative to the stationary iron core assembly under the action of the magnetic field generated by the electromagnetic coil, magnetically engaging with the stationary iron core assembly; and The valve seat, the sealing element (2) faces the valve seat through the opening (122) of the moving iron core body (1).

10. An electric braking system for commercial vehicles, characterized in that, The electric braking system includes the solenoid valve according to claim 9.

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