Electrically controlled on-off valve and air suspension system

Abstract

This invention discloses an electrically controlled switching valve and an air suspension system. The energy-absorbing plate of the electrically controlled switching valve is entirely embedded in an embedded groove. When the moving iron core impacts the energy-absorbing plate, the plate is not subjected to radial shear force. Simultaneously, the arc-shaped boss on the end face can quickly deform to better absorb the instantaneous impact energy upon initial contact, achieving a better energy absorption effect and mitigating the impact force on the main body area of ​​the energy-absorbing plate, thereby reducing the lateral deformation amplitude of the main body area. Furthermore, the arc-shaped boss has gaps between itself and the inner and outer edges of the energy-absorbing plate, providing ample radial expansion space. Combined with the arc-shaped design, buckling instability and localized stress concentration are avoided. Moreover, the movable shaft of the valve core can move relative to the moving iron core. When the valve core contacts the valve seat, the reaction force of the spring can decelerate the moving iron core to a certain extent, reducing the impact force of the moving iron core on the energy-absorbing plate. The combination of these design features effectively improves the service life of the energy-absorbing plate.

Description

Technical Field

[0001] This invention relates to the field of automotive parts, and in particular to electronically controlled switching valves and air suspension systems. Background Technology

[0002] Electrically controlled switching valves, also known as solenoid valves, are important actuators in air suspension systems.

[0003] Similar to the patent document with authorization announcement number CN223105423U, the static iron core and the moving iron core of the existing solenoid valve are often in hard contact during adsorption.

[0004] To overcome this problem, patent document CN218625634U discloses a solution of fitting a noise-reducing washer to the end of a stationary iron core and making a portion of the noise-reducing washer protrude from the end of the stationary iron core.

[0005] The problem with this approach is that, because the noise-reducing washer is fitted onto the stationary iron core, the portion of the washer protruding from the core is subjected to radial shear force from the end of the core when subjected to impact. Therefore, this protruding portion is prone to cracking during deformation. Furthermore, since the deformation of the inner side of the washer is restricted by the stationary iron core, the deformation is mainly concentrated on the outer side, increasing the risk of cracking on the outer side and ultimately causing the washer to easily fail. Summary of the Invention

[0006] The purpose of this invention is to solve the above-mentioned problems existing in the prior art and to provide an electronically controlled switching valve and an air suspension system.

[0007] The objective of this invention is achieved through the following technical solution: An electrically controlled switching valve includes a housing. A valve seat and a stationary iron core are disposed at the first axial end of the housing. A movable iron core is disposed inside the housing, opposite to and attracted by the stationary iron core. The movable iron core is connected to a valve core and drives the valve core to move towards the valve seat. An energy-absorbing plate is provided in the embedding groove at one end of the stationary iron core facing the moving iron core. A portion of the moving iron core can be embedded in the embedding groove and pressed on the energy-absorbing plate. A set of arc-shaped protrusions evenly distributed around the axis of the energy-absorbing plate are formed on the end face of the energy-absorbing plate facing the moving iron core. The valve core has a movable shaft, which includes a first shaft body, a second shaft body, and an abutment body arranged sequentially along its axial direction. The first shaft body extends through the stationary iron core into a first section of the axial hole of the moving iron core. A return spring is provided at the first section, which is fitted around the outer periphery of the first and second shaft bodies. The return spring is used to drive the moving iron core to move away from the stationary iron core and reset. The second shaft body is movably inserted through a second section of the axial hole. A stop spring is fitted around the outer periphery of the second shaft body to make the abutment body located in a third section of the axial hole abut against a first abutment surface in the axial hole. The stop spring extends at least partially into the return spring. The diameter of the second section is smaller than the diameters of the first and third sections.

[0008] Preferably, the energy-absorbing sheet has arc-shaped protrusions with corresponding positions on its two end faces.

[0009] Preferably, the top and root of the arc-shaped boss are rounded, and the top and root form an S-shaped curved surface.

[0010] Preferably, the width of the arc-shaped boss is greater than or equal to 1 / 2 of the ring width of the energy-absorbing sheet and less than or equal to 2 / 3 of the ring width; the arc-shaped boss is located at the exact midpoint between the inner and outer edges of the energy-absorbing sheet.

[0011] Preferably, the first shaft and the second shaft are detachably connected and / or the second shaft and the abutment are detachably connected.

[0012] Preferably, a gap is maintained between the first shaft and the stationary iron core, the first shaft is connected to the sealing head of the valve core, the sealing head is movably disposed at the center hole of the stationary iron core and the sealing head has an air hole extending axially along the valve core and located outside the first shaft.

[0013] Preferably, an energy-absorbing sleeve is fitted onto the abutment, the energy-absorbing sleeve having an energy-absorbing portion extending between the abutment and the first end face.

[0014] Preferably, the abutment spring is partially limited at the fourth hole segment of the axial hole, the fourth hole segment is located between the first hole segment and the second hole segment, and the diameter of the fourth hole segment is adapted to the outer diameter of the abutment spring, and the depth of the fourth hole segment is less than or equal to the thickness of the energy-absorbing sheet.

[0015] Preferably, the second end of the housing is sealed with an integrally injection-molded electrical connector.

[0016] An air suspension system, including an electronically controlled switching valve as described in any of the above.

[0017] The advantages of the technical solution of this invention are mainly reflected in: In this invention, the energy-absorbing plate is entirely embedded in the groove at the end of the stationary iron core. When the moving iron core impacts the energy-absorbing plate, the plate is not subjected to radial shear force generated by the stationary iron core. Because the end face of the energy-absorbing plate is provided with an arc-shaped protrusion, the contact area between the moving iron core and the energy-absorbing plate can be effectively reduced, avoiding the impact effect during large-area contact and thus reducing noise. Furthermore, the arc-shaped protrusion design allows for gradual axial deformation, enabling better absorption of the instantaneous impact energy upon initial contact, achieving better energy absorption and noise reduction. Additionally, the arc-shaped protrusion has gaps between its side and the inner and outer edges of the energy-absorbing plate, providing sufficient radial expansion space. Combined with the arc design, this prevents buckling instability and better guides the uniform release of pressure, avoiding localized stress concentration. Simultaneously, the rapid deformation of the arc-shaped protrusion can alleviate the impact force on the main body area of ​​the energy-absorbing plate, thereby reducing the deformation amplitude of the main body area. The combination of these design features effectively improves the service life of the energy-absorbing plate. Furthermore, the movable shaft of the valve core can move relative to the moving iron core. When the valve core contacts the valve seat, the abutment spring applies a force to the moving iron core in the opposite direction to the movement of the moving iron core, which can decelerate the moving iron core to a certain extent, thereby reducing the impact force of the moving iron core on the energy-absorbing plate and further protecting the energy-absorbing plate. In addition, the impact force on the valve core during contact can be reduced by moving the valve core relative to the moving iron core, which can protect the sealing ring at the valve core. Moreover, the structure of the movable shaft and the nested structure of the return spring and the abutment spring can reduce the radial space required for spring installation, which is beneficial to reducing the radial dimension of the electrically controlled switching valve, thereby better meeting the needs of use in confined spaces.

[0018] The present invention sets the top corner and root of the arc-shaped boss as rounded corners and forms an S-shaped curved surface, which can form nonlinear buffer characteristics, suppress rebound, and help eliminate stress singularities, prevent the initiation of circumferential microcracks, and improve fatigue life.

[0019] This invention, through the design of the width and central angle of the arc-shaped boss, enables the arc-shaped boss to have sufficient supporting stiffness to prevent the arc-shaped boss from collapsing too quickly and failing to play a buffering role, thereby better reducing the stress on the main body of the energy-absorbing sheet. At the same time, placing the arc-shaped boss at the center of the inner and outer edges can make the stress distribution most uniform, avoid local overload, and help improve fatigue resistance.

[0020] This invention employs double-sided arc-shaped bosses and positions them directly opposite each other. This effectively reduces the contact area between the energy-absorbing sheet and the stationary iron core, decreasing the transfer of impact energy to the stationary iron core and other components. This helps suppress structural resonance and ensures structural stability. Simultaneously, the direct arrangement of the arc-shaped bosses ensures a uniform distribution of strain energy density along the thickness direction, effectively reducing additional bending moments or shear components, thereby extending the service life of the energy-absorbing sheet.

[0021] This invention connects the abutment to the energy-absorbing sleeve, which can effectively overcome the impact when the abutment and the moving iron core re-engage, thereby further reducing noise and vibration during operation.

[0022] This invention maintains a distance between the first shaft and the stationary iron core, and provides air holes at the end plate of the sealing head, which allows the gas between them to be discharged more smoothly during the movement of the moving iron core to the stationary iron core, thereby avoiding the whistling sound generated when the gas between them is discharged from the small gap. Attached Figure Description

[0023] Figure 1 This is a cross-sectional view of the electrically controlled switching valve of the present invention; Figure 2 This is a cross-sectional view of the electrically controlled switch valve of the present invention with the electrical connectors concealed; Figure 3 This is a perspective view of the energy-absorbing sheet of the present invention; Figure 4 yes Figure 1 A magnified view of a portion of the image; Figure 5 This is an end view of the energy-absorbing sheet of the present invention; Figure 6 This is a partial cross-sectional view of the stationary iron core, moving iron core, and valve core areas of the present invention. Figure 7 This is a perspective view of the electrical connector of the present invention; Figure 8 This is a perspective view of the skeleton of the present invention; Figure 9 This is a partial cross-sectional view of the electrically controlled switching valve of the present invention, with the outer shell, valve seat, valve core and moving iron core concealed. Detailed Implementation

[0024] The objectives, advantages, and features of this invention will be illustrated and explained through the following non-limiting description of preferred embodiments. These embodiments are merely typical examples of applying the technical solutions of this invention, and all technical solutions formed by equivalent substitutions or equivalent transformations fall within the scope of protection claimed by this invention.

[0025] In the description of the solution, it should be noted that the terms "center," "upper," "lower," "left," "right," "front," "rear," "vertical," "horizontal," "inner," and "outer," etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the accompanying drawings and are only for the convenience and simplification of description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of the present invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0026] Example 1 The electrically controlled switching valve disclosed in this invention will now be described in conjunction with the accompanying drawings, as shown in the attached drawings. Figure 1 As shown, it includes a housing 100, and a valve seat 200 and a stationary iron core 300 are provided at the first axial end of the housing 100. The outer casing 100 is further provided with a moving iron core 400 that is opposite to the stationary iron core 300 and can be attracted by the stationary iron core 300. The moving iron core 400 is connected to the valve core 500 and drives the valve core 500 to move towards the valve seat 200.

[0027] An energy-absorbing plate 600 is provided at one end of the stationary iron core 300 facing the moving iron core 400.

[0028] As attached Figure 1 Appendix Figure 2 Appendix Figure 3 As shown, the energy-absorbing plate 600 is embedded in an embedding groove 310 provided on the end face of the stationary iron core 300 facing the moving iron core 400, and the thickness of the energy-absorbing plate is slightly less than the depth of the embedding groove, so that the entire energy-absorbing plate is submerged in the embedding groove. The embedding groove 310 is a circular groove, and the energy-absorbing plate 600 is annular. The energy-absorbing plate 600 includes an annular main body portion 610 adapted to the inner diameter of the circular groove. The outer diameter of the moving iron core 400 allows a portion of the moving iron core to be embedded in the embedding groove 310 and pressed onto the energy-absorbing plate 600.

[0029] As attached Figure 3 Appendix Figure 4 Appendix Figure 5 As shown, in order to improve the energy absorption effect and extend the service life of the energy-absorbing plate 600, a set of arc-shaped bosses 620 are formed on the end face of the energy-absorbing plate 600 facing the moving iron core, which are evenly distributed around the axis of the energy-absorbing plate. The width W1 of the arc-shaped bosses is greater than or equal to 1 / 2 of the ring width W2 of the energy-absorbing plate and less than or equal to 2 / 3 of the ring width W2. The ring width is the difference between the outer circle radius and the inner circle radius of the energy-absorbing plate. The arc-shaped bosses are located at the exact midpoint between the inner edge 630 and the outer edge 640 of the energy-absorbing plate 600.

[0030] The number of arc-shaped protrusions in a group can be designed as needed. In this embodiment, it is preferred that the number of arc-shaped protrusions in a group is 3. At the same time, the central angle θ of each arc-shaped protrusion is not less than 75° and not more than 105°, and more preferably between 80° and 90°.

[0031] In a more preferred embodiment, the energy-absorbing sheet 600 has arc-shaped protrusions formed on both end faces, with the positions of the arc-shaped protrusions at both ends corresponding one-to-one. Furthermore, the apex 621 and root 622 of the arc-shaped protrusion 620 are rounded, and the apex 621 and root 622 form an S-shaped curved surface.

[0032] The energy-absorbing sheet 600 can be made of known soft materials, such as silicone, rubber, foam, etc., and is not limited here.

[0033] As attached Figure 1 Appendix Figure 2 Appendix Figure 6 As shown, the valve core 500 has a plugging head 510 for sealing the axial fluid port 210 at the end of the valve seat 200 facing away from the housing, and a movable shaft 520 coaxially connected to the plugging head 510. The specific shape of the plugging head 510 can be set as needed. Preferably, the plugging head is a groove 511 coaxial with the axial fluid port. The groove opening of the groove 511 faces the axial fluid port 210. A sealing ring 512 is provided at the open end of the groove 511. The inner diameter of the sealing ring 512 is larger than the diameter of the axial fluid port. The sealing ring is fitted around the outer periphery of the groove 511 and abuts against the retaining edge 513 of the outer wall of the groove 511. A clamp 514 for fixing the sealing ring is provided at the retaining edge 513.

[0034] To further reduce the impact force when the valve core contacts the valve seat and to reduce the impact force of the moving iron core on the energy-absorbing plate, as shown in the attached... Figure 6 As shown, the sealing head 510 is partially embedded in the central hole of the stationary iron core 300 and can move axially relative to the stationary iron core. The movable shaft 520 extends through the central hole of the stationary iron core into the axial hole of the moving iron core 400. The movable shaft includes a first shaft body 521, a second shaft body 522 and an abutment 523 arranged sequentially along its axial direction. The axial hole includes a first hole section 410, a second hole section 420 and a third hole section 430 arranged sequentially along its axial direction. The first hole section 410 is close to the stationary iron core and its diameter is larger than that of the second hole section 420. The diameter of the second hole section 420 is smaller than that of the third hole section 430.

[0035] The first shaft 521 extends through the stationary iron core into the first hole section 410 of the moving iron core. A return spring 700 is provided at the first hole section 410, fitted around the outer periphery of the first shaft 521 and the second shaft 522. The outer diameter of the return spring is approximately equal to the diameter of the first hole section, thus effectively confining it within the first hole section. The return spring 700 drives the moving iron core to move away from the stationary iron core and reset. One end of the return spring 700 abuts against the end of the stationary iron core facing the moving iron core, and the other end abuts against the second contact surface 440 in the axial hole. When the moving iron core moves towards the stationary iron core under magnetic attraction, the return spring 700 is compressed. When the stationary iron core stops magnetically attracting the moving iron core, the elastic force of the return spring 700 is released, driving the moving iron core 400 to move away from the stationary iron core and reset, thereby causing the valve core to separate from the valve seat.

[0036] The second shaft 522 is movably inserted through the second hole section 420 of the axial hole. The length of the second shaft 522 is greater than the depth of the second hole section 420, and the outer diameter of the second shaft 522 is adapted to the diameter of the second shaft hole, so that the second hole section 420 can effectively guide the second shaft 522. A retaining spring 800 is fitted around the outer periphery of the second shaft 522 to abut the abutment 523 located at the third hole section 430 of the axial hole and abut the first abutment surface 450 inside the axial hole. The inner diameter of the retaining spring 800 is slightly larger than the diameter of the second shaft 522. One end of the retaining spring 800 abuts against the end where the first shaft 521 and the second shaft 522 connect, and the other end of the retaining spring 800 abuts against the third abutment surface inside the axial hole. The abutment surface can be the same as the second abutment surface 440. More preferably, to better limit the abutment spring and prevent it from wobbling and interfering with the return spring 700, the abutment spring 800 is partially limited at the fourth hole segment 460 of the axial hole. The fourth hole segment 460 is located between the first hole segment 410 and the second hole segment, and the diameter of the fourth hole segment 460 is adapted to the outer diameter of the abutment spring 800. The depth of the fourth hole segment is less than or equal to the thickness of the energy-absorbing sheet. Furthermore, the outer diameter of the abutment spring 800 is smaller than the diameter of the first shaft 521, so that the abutment spring 800 at least partially extends into the return spring 700, which can effectively reduce the axial installation space required for the abutment spring.

[0037] Since the diameters of the first shaft 521 and the abutment 523 are larger than the diameter of the second shaft 522, for ease of assembly, the first shaft 521 and the second shaft 522 are detachably connected and / or the second shaft 522 and the abutment 523 are detachably connected. For example, the first shaft 521 and the second shaft 522 are threaded together, meaning that the first shaft 521 may have a threaded hole extending axially therein, and the second shaft 522 has an external thread that fits into the threaded hole, so that the second shaft can be inserted into the threaded hole and they are threadedly connected.

[0038] As attached Figure 6 As shown, in order to reduce the impact between the abutment 523 and the moving iron core 400, an energy-absorbing sleeve 530 is fitted around the outer periphery of the abutment 523. The energy-absorbing sleeve 530 has an energy-absorbing portion 531 extending to the end face of the abutment 523 facing the second shaft.

[0039] As attached Figure 6 As shown, a gap of 900 is maintained between the first shaft and the stationary iron core. The first shaft is connected to the end plate 515 of the sealing head. The end plate 515 is the bottom plate of the groove facing the moving iron core. An air hole 516 extending along the axial direction of the valve core is formed at the end plate, so that when the moving iron core moves towards the stationary iron core, the air between them can be smoothly discharged from the gap and the air hole.

[0040] As attached Figure 1 Appendix Figure 2 Appendix Figure 7 As shown, the second axial end of the housing 100 is sealed with an electrical connector a. Specifically, the second axial end of the housing 100 forms a sleeve portion 110. The sleeve portion 110 includes a frustum-shaped limiting portion 111 and an annular portion 112. The electrical connector a includes a connecting portion a10 that is adapted to the shape of the sleeve portion 110. The sleeve portion 110 is sleeved on the outer periphery of the connecting portion a10 and limits the connecting portion a10 at the fourth abutting surface 113 inside the sleeve portion 110. The electrical connector a also includes an outer end a20 located outside the second end and abutting against the second end. An end sealing ring a30 that fits tightly against the outer end a20 is fitted on the outer periphery of the sleeve portion 110.

[0041] To facilitate the assembly of the housing with the electrical connector a, the housing 100 may include, for example, two approximately semi-circular half-shells, which are assembled into a whole by means of snap-fit, screw-fit, welding or other feasible methods.

[0042] As attached Figure 7 -Appendix Figure 9As shown, an external connector a40 is integrally formed at the outer end a20. The external connector a40 includes two terminals a41, which extend into a recessed insertion groove a11 on the end face of the connecting part a10 facing the first end. The coil b skeleton b10 of the housing 100 is provided with a connector b11 adapted to the insertion groove a11. When the connector b11 is inserted into the insertion groove a11, the two terminal connectors in the connector b11 connect to the two terminals a41 in the insertion groove a11, respectively. The two terminal connectors connect to the two leads (not shown in the figure) of the winding b20 of the coil b. This design effectively simplifies the adaptation structure between the connector b11 and the slot.

[0043] As attached Figure 1 Appendix Figure 2 As shown, the end of the outer shell 100 connected to the valve seat 200 has a bent portion 120 that bends radially inward. The stationary iron core 300 passes through the bent portion 120 and is pressed between the bent portion 120 and the valve seat 200. Specifically, the outer shell 100 and the valve seat 200 are connected by a limiting sleeve c fitted around their outer periphery. The limiting sleeve c includes a first annular sleeve portion c10 and a second sleeve portion c20 in the shape of an inverted frustum. The valve seat 200 has an inverted frustum portion 220 that matches the shape of the second sleeve portion c20. The first sleeve portion c10 is fitted around the outer periphery of the outer shell 100 and the two are screwed or welded together. The second sleeve portion c20 is fitted around the outer periphery of the inverted frustum portion 220 and the two are screwed or welded together. Thus, the second sleeve portion c20 causes the valve seat 200 to abut against the bent portion 120. Meanwhile, a fifth abutment surface 230 is provided on the wall of the axial hole of the valve seat 200. The stationary iron core 300 has a first portion 320 extending into the valve seat 200 and a second portion 330 passing through the bent portion. The outer diameter of the first portion 320 is larger than the inner diameter of the coil but smaller than the outer diameter of the coil. One end of the first portion 320 abuts against the fifth abutment surface 230, and the other end of the first portion 320 abuts against the bent portion 120. The bent portion 120 and the first portion 320 of the stationary iron core 300 are sealed by an end face sealing ring d. This structural design not only greatly reduces the size of the stationary iron core 300, which is beneficial to improving the electromagnetic performance of the electrically controlled switching valve, but also simplifies the sealing structure.

[0044] As attached Figure 2 Appendix Figure 3As shown, the second part 330 of the stationary iron core 300 extends into the inner hole of the coil b, the coil b is clamped between the connecting part a10 and the bending part 120, and the second part 330 is connected to a magnetic shield e, the magnetic shield extending into the groove at the connecting part a10, the moving iron core 400 is movably disposed in the magnetic shield and is coaxial with the moving iron core 400, the valve seat 200, the valve core 500 and the outer shell.

[0045] When the coil b is energized, the stationary iron core attracts the moving iron core, thereby driving the valve core to move towards the valve seat. At this time, the sealing ring 512 at the sealing head 510 of the valve core is first attached to the port portion 250 where the axial fluid port 210 is located, thereby disconnecting the axial fluid port 210 from the radial fluid port 240 on the side wall of the valve seat. At this time, the moving iron core continues to move towards the valve seat until it abuts against the energy-absorbing plate, thereby separating the abutting head 523 from the first abutting surface 450.

[0046] When the coil is de-energized, the reset spring drives the moving iron core to move in the opposite direction to reset, thereby separating the sealing ring from the port and making the port connected to the radial fluid port.

[0047] Example 2 This embodiment discloses an air suspension system, including an electronically controlled switching valve as described above.

[0048] This invention has many other embodiments, and all technical solutions formed by equivalent transformation or equivalent transformation fall within the protection scope of this invention.

Claims

1. An electrically controlled switching valve, comprising a housing, wherein a valve seat and a stationary iron core are disposed at a first axial end of the housing, and a movable iron core is disposed inside the housing opposite to and attracted by the stationary iron core, the movable iron core being connected to a valve core and driving the valve core to move toward the valve seat, characterized in that: An energy-absorbing plate is provided in the embedding groove at the end of the stationary iron core facing the moving iron core. A portion of the moving iron core can be embedded in the embedding groove and pressed on the energy-absorbing plate. The thickness of the energy-absorbing plate is less than the depth of the embedding groove. A set of arc-shaped bosses evenly distributed around the axis of the energy-absorbing plate are formed on the end face of the energy-absorbing plate facing the moving iron core. The arc-shaped bosses maintain a distance from the inner and outer edges of the energy-absorbing plate. The valve core has a movable shaft, which includes a first shaft body, a second shaft body, and an abutment body arranged sequentially along its axial direction. The first shaft body extends through the stationary iron core into a first section of the axial hole of the moving iron core. A return spring is provided at the first section, which is fitted around the outer periphery of the first and second shaft bodies. The return spring is used to drive the moving iron core to move away from the stationary iron core and reset. The second shaft body is movably inserted through a second section of the axial hole. A stop spring is fitted around the outer periphery of the second shaft body to make the abutment body located in a third section of the axial hole abut against a first abutment surface in the axial hole. The stop spring extends at least partially into the return spring. The diameter of the second section is smaller than the diameters of the first and third sections.

2. The electrically controlled switching valve according to claim 1, characterized in that: The energy-absorbing sheet has arc-shaped protrusions with corresponding positions on its two end faces.

3. The electrically controlled switching valve according to claim 1, characterized in that: The top and root of the arc-shaped boss are rounded, and the top and root form an S-shaped curved surface.

4. The electrically controlled switching valve according to claim 1, characterized in that: The width of the arc-shaped boss is greater than or equal to 1 / 2 of the ring width of the energy-absorbing sheet and less than or equal to 2 / 3 of the ring width. The arc-shaped boss is located at the exact midpoint between the inner and outer edges of the energy-absorbing sheet.

5. The electrically controlled switching valve according to claim 1, characterized in that: The first shaft and the second shaft are detachably connected and / or the second shaft and the abutment are detachably connected.

6. The electrically controlled switching valve according to claim 1, characterized in that: A gap is maintained between the first shaft and the stationary iron core. The first shaft is connected to the sealing head of the valve core. The sealing head is movably disposed at the center hole of the stationary iron core and has an air hole formed on the sealing head that extends axially along the valve core and is located outside the first shaft.

7. The electrically controlled switching valve according to claim 1, characterized in that: An energy-absorbing sleeve is fitted onto the abutment, the energy-absorbing sleeve having an energy-absorbing portion extending between the abutment and the first end face.

8. The electrically controlled switching valve according to claim 1, characterized in that: The abutment spring is partially limited at the fourth hole segment of the axial hole. The fourth hole segment is located between the first hole segment and the second hole segment, and the diameter of the fourth hole segment is adapted to the outer diameter of the abutment spring. The depth of the fourth hole segment is less than or equal to the thickness of the energy-absorbing sheet.

9. The electrically controlled switching valve according to any one of claims 1-8, characterized in that: The second axial end of the housing is sealed with an integrally injection-molded electrical connector.

10. An air suspension system, characterized in that: Includes the electrically controlled switching valve as described in any one of claims 1-9.

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