Air suspension rigidity electromagnetic valve without magnetism isolating ring

Abstract

The air suspension rigidity electromagnetic valve comprises a valve body, a valve element and an electromagnetic driving assembly, the valve element can be axially and movably installed in the valve body, a conical valve seat is arranged at the bottom in the valve body, an exhaust port is formed in the side wall of the valve body, the conical valve seat is communicated with a plurality of air inlets, a first through hole is formed in a yoke, and a second through hole is formed in the yoke. A coil assembly is arranged in the first through hole, a magnetic circuit optimization structure is arranged on the outer surface of the stop iron and comprises a groove and / or a spiral groove, the armature and the auxiliary stop iron are arranged in a first step of the stop iron, a film is arranged between the armature and the inner wall of the first step, the ejector rod penetrates through an inner hole of the auxiliary stop iron, and one end of the ejector rod is connected with the armature. The ejector rod is sleeved with a spring, one end of the valve element is connected with the third step of the auxiliary stop iron in a matched mode, and the end face of the other end of the valve element is wrapped with a sealing gasket in a plastic mode and forms a sealing face. The electromagnetic performance and reliability are remarkably improved, the service life is remarkably prolonged, and meanwhile the process difficulty and cost are reduced.

Description

Technical Field

[0001] This invention relates to the field of air suspension control technology, and in particular to an air suspension stiffness solenoid valve without a magnetic isolation ring. Background Technology

[0002] The suspension stiffness valve is the core control component of a dual (multi) chamber air suspension system. Its function is to adjust the stiffness of the air spring by quickly connecting or disconnecting different air chambers, thereby changing the equivalent air chamber volume of the suspension system to adapt to different vehicle loads and driving conditions, and ultimately improving the vehicle's ride comfort, handling stability and road adaptability.

[0003] Currently, most mainstream air suspension stiffness solenoid valves on the market adopt platform or basin electromagnet structures. The typical feature of this type of structure is that, in order to obtain sufficient electromagnetic attraction, a magnetic circuit breaker design is usually adopted. The guiding and supporting components (such as bushings, bearings, etc.) of the magnetically conductive moving iron (i.e. armature) are designed as independent non-magnetically conductive parts, or a section of non-magnetically conductive medium (such as air or specific magnetic shielding material) is introduced into the fit gap between the moving iron and the stationary iron (such as yoke, pole shoe) to force the magnetic lines of force to concentrate through the effective working cross section of the moving iron.

[0004] However, the above-mentioned traditional structure has obvious technical drawbacks: (1) The assembly precision requirements are strict and the cost is high: the independent non-magnetic guide part requires extremely high processing and assembly coaxiality. Any slight deviation will affect the smoothness of the moving iron movement; (2) The reliability risk is prominent and jamming is easy to occur: under the action of electromagnetic force, the moving iron will be subjected to radial lateral attraction from the stationary iron. Once the coaxiality of the guide part is not good, the lateral force will cause the moving iron to wobble, rub against the inner wall of the guide part, or even mechanically interfere, thereby causing motion jamming, which will prevent the valve from opening and closing normally and cause functional failure; (3) The structure is complex and the performance is limited: the introduction of an independent magnetic shielding ring or a complex non-magnetic support structure not only increases the number of parts and assembly process, but may also limit the further improvement of electromagnetic force density, affecting the valve's response speed and power density. Summary of the Invention

[0005] The purpose of this invention is to provide an air suspension stiffness solenoid valve without a magnetic isolation ring, thereby solving the aforementioned problems in the prior art.

[0006] To solve the above-mentioned technical problems, the present invention adopts the following technical solution: This invention discloses an air suspension stiffness solenoid valve without a magnetic ring, comprising a valve body, a valve core, and an electromagnetic drive assembly. The valve core is axially movable and mounted within the valve body. A conical valve seat is located at the bottom of the valve body, and an exhaust port is provided on its side wall. The conical valve seat is connected to several air inlets. The electromagnetic drive assembly includes a mounting plate, a yoke, pole shoes, a stop, an armature, an auxiliary stop, and a push rod. A first through hole is provided inside the yoke, and a coil assembly is disposed within the first through hole. The coil assembly is plastic-coated with the pole shoes. The stop is fixedly disposed inside the yoke by the mounting plate. The yoke, pole shoes, armature, and stop together form a closed magnetic circuit. A second through hole and a first step are provided inside the stop, and a magnetic circuit optimization structure is provided on its outer surface. The second through hole is interference-fitted with the stop cover. The optimized magnetic circuit structure includes grooves and / or spiral grooves. The armature and the auxiliary stop are disposed within the first step, and a thin film is provided between the armature and the inner wall of the first step. The auxiliary stop has a second step, a third step, and a fourth step arranged sequentially inside. The push rod passes through the inner hole of the auxiliary stop and is connected to the armature at one end and to the valve core at the other end. A spring is sleeved on the push rod, and one end of the spring is installed in the second step, while the other end abuts against the armature. One end of the valve core is connected to the third step, and the other end is covered with a sealing gasket to form a sealing surface. By sealing or disengaging the sealing surface from the conical valve seat, the air inlet and the exhaust port are disconnected or connected.

[0007] Furthermore, the stop, armature, yoke, pole shoe, and mounting plate are all made of magnetically conductive metal material, while the valve body, valve core, push rod, spring, and sealing gasket are all made of non-magnetically conductive material.

[0008] Furthermore, the surfaces of the stop, the armature, the yoke, the pole shoe, and the mounting plate are all coated with a wear-resistant and corrosion-resistant coating.

[0009] Furthermore, a shim is fitted between the end face of the auxiliary stop and the armature, and the shim is made of a non-magnetic material.

[0010] Furthermore, the yoke is provided with a fifth step and a sixth step at its two ends, respectively. The fifth step is interference-fitted with the mounting plate, and the sixth step is fitted with a first sealing ring.

[0011] Furthermore, the outer surfaces at both ends of the stop are respectively provided with a seventh step and an eighth step. The seventh step is in clearance fit with the pole shoe, and a second sealing ring is assembled between the front end of the eighth step and the valve body.

[0012] Furthermore, a third sealing ring is installed between the valve core and the third step, and a fourth sealing ring is installed between the valve core and the fourth step.

[0013] Furthermore, a fifth sealing ring and a sixth sealing ring are fitted on the outer periphery of the valve body, and the sixth sealing ring is fitted at the connection between the valve body, the mounting plate and the yoke.

[0014] Furthermore, the electromagnetic drive assembly also includes a mounting positioning ring, the yoke is press-fitted to the mounting positioning ring, and a seventh sealing ring is used to seal the coil assembly.

[0015] Furthermore, it also includes a base plate, which is located at the end of the yoke away from the valve body and is sleeved with the mounting positioning ring. The mounting positioning ring and the base plate together form a housing for encapsulating the coil assembly.

[0016] Compared with the prior art, the beneficial technical effects of the present invention are as follows: This invention's air suspension stiffness solenoid valve without a magnetic isolation ring abandons the traditional independent magnetic isolation ring and complex non-magnetic guide structure. It employs a closed magnetic circuit design composed of a magnetically conductive stop, yoke, pole shoe, and armature, supplemented by a thin film on the inner wall of the armature and stop step for guidance and friction reduction. This eliminates the root cause of armature swaying torque caused by lateral electromagnetic attraction in traditional designs, fundamentally preventing motion jamming and greatly improving the solenoid valve's reliability under long-term vibration and high-frequency operation. Simultaneously, through a unique optimized magnetic circuit structure, the magnetic flux is effectively concentrated and guided, reducing magnetic resistance and leakage. With the same external dimensions and power consumption, it can generate a greater effective electromagnetic attraction, resulting in faster and more powerful valve core action. This invention significantly improves the opening and closing response speed of the valve, enabling faster adjustment of suspension stiffness to adapt to dynamic driving requirements. Furthermore, it eliminates the need for high-precision independent magnetic isolation rings and dedicated guide components, simplifying the overall structure and reducing reliance on precision machining and complex assembly processes. The main magnetic conductive components can utilize conventional magnetic materials and be processed using mature techniques, effectively controlling manufacturing costs while ensuring performance and improving product consistency and production yield. By setting a multi-stage stepped structure and corresponding sealing rings, reliable static and dynamic sealing of the coil cavity, valve cavity, and various connection interfaces is achieved, effectively preventing media leakage and external contamination intrusion. This ensures the long-term stable operation of the solenoid valve in harsh environments and extends its service life.

[0017] The air suspension stiffness solenoid valve without magnetic ring of the present invention has achieved significant improvements over the traditional magnetic ring solenoid valve in terms of reliability, response speed, electromagnetic efficiency, manufacturing cost and sealing durability. It is especially suitable for modern vehicle air suspension systems with strict requirements for reliability, response speed and space. Attached Figure Description

[0018] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0019] Figure 1 This is a schematic diagram of the overall structure of the air suspension stiffness solenoid valve without magnetic isolation ring of the present invention. Figure 2 This is a schematic diagram of the yoke iron structure in the air suspension stiffness solenoid valve without magnetic isolation ring of the present invention. Figure 3 This is a schematic diagram of the stop iron structure in the air suspension stiffness solenoid valve without magnetic isolation ring of the present invention. Figure 4 This is a schematic diagram of the auxiliary stop in the air suspension stiffness solenoid valve without magnetic isolation ring of the present invention.

[0020] Explanation of reference numerals in the attached drawings: 1-Mounting positioning ring; 2-Stop plug; 3-Stop; 4-Gasket; 5-Spring; 6-Valve core; 7-Fourth sealing ring; 8-Mounting plate; 9-Sealing gasket; 10-Fifth sealing ring; 11-Valve body; 12-Sixth sealing ring; 13-Third sealing ring; 14-Auxiliary stop; 15-Yoke; 16-Push rod; 17-Coil assembly; 18-Diaphragm; 19-Armature; 20-First sealing ring; 21-Pole shoe; 22-Seventh sealing ring; 23-Base plate; 24-Second sealing ring; 25-First through hole; 26-Fifth step; 27-Sixth step; 28-Seventh step; 29-Second through hole; 30-Groove; 31-Helical groove; 32-Eighth step; 33-First step; 34-Second step; 35-Third step; 36-Fourth step. Detailed Implementation

[0021] Embodiments of the present invention are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and should not be construed as limiting the present invention.

[0022] In the description of this invention, it should be understood that the terms "length," "width," "inner," and "outer," etc., indicating orientation or positional relationships based on the orientation or positional relationships shown in the accompanying drawings, are only for the convenience of describing the invention and simplifying the 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 invention. Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this invention, "a plurality of" means two or more, unless otherwise explicitly specified.

[0023] In the description of this invention, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0024] The technical solutions provided by the embodiments of the present invention will be described in detail below with reference to the accompanying drawings.

[0025] like Figures 1 to 4 As shown, the air suspension stiffness solenoid valve without magnetic isolation ring in this embodiment includes a valve body 11, a valve core 6 and an electromagnetic drive assembly. The valve body 11 has an axial through hole inside, a conical valve seat is formed at its bottom, and an exhaust port is opened on the side wall. The conical valve seat is connected to one or more air inlets provided on the valve body 11 through an internal flow channel. The valve core 6 is axially slidably disposed in the axial through hole of the valve body 11.

[0026] The electromagnetic drive assembly includes a mounting plate 8, a yoke 15, a pole shoe 21, a stop 3, an armature 19, an auxiliary stop 14, and a push rod 16, as shown below. Figure 2 As shown, the yoke 15 has a first through hole 25 inside, and a coil assembly 17 is installed inside the first through hole 25. The coil assembly 17 is fixed with a pole shoe 21 by plastic coating. The stop iron 3 is fixed inside the yoke 15 by a mounting plate 8. The yoke 15, pole shoe 21, armature 19 and stop iron 3 together form a closed magnetic circuit, as shown. Figure 3As shown, the stop 3 has a second through hole 29 and a first step 33 inside, and a magnetic circuit optimization structure on its outer surface. The second through hole 29 is heavily press-fitted with the stop plug 2 to achieve a reliable seal, which can effectively prevent the internal cavity pressure from leaking from the tail end of the stop 3. The magnetic circuit optimization structure includes a groove 30 and / or a spiral groove 31, which can enhance the magnetic flux concentration and improve the electromagnetic force output. The armature 19 and the auxiliary stop 14 are disposed in the first step 33, and a thin film 18 is provided between the armature 19 and the inner wall of the first step 33. The thin film 18 can reduce the friction between moving parts and help extend the working life of the solenoid valve.

[0027] Specifically, such as Figure 4 As shown, the auxiliary stop 14 has a second step 34, a third step 35, and a fourth step 36 arranged sequentially inside. The push rod 16 passes through the inner hole of the auxiliary stop 14. One end of the push rod 16 is interference-fitted with the armature 19, and the other end is interference-fitted with the valve core 6, thereby realizing the force transmission from the armature 19 to the valve core 6. The push rod 16 is fitted with a spring 5, and one end of the spring 5 is installed in the second step 34, and the other end abuts against the armature 19. When the electromagnetic force is removed, it provides a reset spring force for the armature 19 and the valve core 6. One end of the valve core 6 is connected to the third step 35, and the other end is fixed with a sealing gasket 9 by a plastic molding process to form a sealing surface. The sealing surface and the valve body 11 establish a seal under the action of electromagnetic force to realize the pressure holding function. By sealing or disengaging the sealing surface from the conical valve seat, the air inlet and the exhaust port are disconnected or connected.

[0028] In this embodiment, the stop 3, armature 19, yoke 15, pole shoe 21, and mounting plate 8 are all made of magnetically conductive metal materials to construct an efficient closed magnetic circuit. The valve body 11, valve core 6, push rod 16, spring 5, and sealing gasket 9 are all made of non-magnetically conductive materials to effectively avoid interference with the working magnetic circuit and improve electromagnetic efficiency. Furthermore, the surfaces of the stop 3, armature 19, yoke 15, pole shoe 21, and mounting plate 8 are all coated with a wear-resistant and corrosion-resistant coating. This coating not only reduces frictional loss during operation and extends the service life of key components, but also improves the environmental adaptability of the solenoid valve under harsh conditions such as humidity and corrosion.

[0029] Furthermore, a gasket 4 is fitted between the end faces of the auxiliary stop 14 and the armature 19. This gasket 4 is made of a non-magnetic material. By setting the gasket 4, on the one hand, the movement stroke of the armature 19 is mechanically limited to prevent the armature 19 from overshooting under the action of electromagnetic force; on the other hand, the final pressing displacement of the valve core 6 is limited to prevent the sealing gasket 9 from being subjected to excessive sealing pressure, which would accelerate wear or cause plastic deformation, thereby effectively protecting the sealing structure and extending the service life of the sealing gasket 9.

[0030] Among them, such as Figure 2As shown, the yoke 15 has a fifth step 26 and a sixth step 27 at its two ends respectively. The fifth step 26 is fixedly connected to the mounting plate 8 by an interference fit, ensuring the structural stability and alignment accuracy between the two. The sixth step 27 is equipped with a first sealing ring 20. The first sealing ring 20 is used to isolate the exhaust port of the solenoid valve from the external environment, forming a reliable external seal and effectively preventing the working medium from leaking out from the exhaust port.

[0031] In addition, a seventh step 28 and an eighth step 32 are respectively provided on the outer surfaces of both ends of the stop 3. The seventh step 28 is fitted with the inner wall of the pole shoe 21 with a clearance fit, which plays an axial positioning and guiding role during the assembly process, ensuring the relative positional accuracy between the stop 3 and the pole shoe 21. A second sealing ring 24 is installed between the front end of the eighth step 32 and the valve body 11. The second sealing ring 24 is used to isolate the electromagnetic drive component cavity and the flow channel of the valve body 11, preventing the internal medium from flowing between the two, and ensuring the pressure independence and functional reliability of each chamber.

[0032] In this embodiment, a third sealing ring 13 is installed between the valve core 6 and the third step 35 of the auxiliary stop 14. The main function of the third sealing ring 13 is to provide buffer damping for the movement of the valve core 6 when the solenoid valve is de-energized and reset, effectively reducing the noise generated by the reset impact, and reducing mechanical collision damage to the valve core 6 and related components, thereby helping to extend the overall service life of the product. A fourth sealing ring 7 is installed between the valve core 6 and the fourth step 36. The main function of the fourth sealing ring 7 is to seal the annular gap between the valve core 6 and the auxiliary stop 14 when the valve core 6 moves, preventing the medium in the valve cavity from leaking along the surface of the valve core 6 to the cavity where the electromagnetic drive assembly is located. When the valve core 6 is in the closed position under the action of electromagnetic force, it can effectively isolate the inlet and outlet passages and realize the pressure holding function of the system. Preferably, the fourth sealing ring 7 can be replaced by elastic sealing elements with different structural forms such as star-shaped sealing rings, V-shaped sealing rings, or Y-shaped sealing rings to adapt to different working pressures, medium characteristics, and service life requirements, thereby improving the flexibility and adaptability of the design.

[0033] Furthermore, a fifth sealing ring 10 and a sixth sealing ring 12 are fitted around the outer periphery of the valve body 11. The sixth sealing ring 12 is fitted at the connection between the valve body 11, the mounting plate 8 and the yoke 15, and is used to establish an effective seal at the assembly interface to prevent the internal medium from leaking to the external environment from the joint between the solenoid valve drive unit and the valve body assembly. The fifth sealing ring 10 is set at a critical isolation position between the air inlet and the exhaust port on the valve body 11. Its function is to ensure that when the valve core 6 is closed, the air inlet passage and the exhaust passage can be reliably isolated, thereby maintaining the system pressure and completing the pressure holding function.

[0034] The electromagnetic drive assembly also includes a mounting positioning ring 1. The yoke 15 and the mounting positioning ring 1 are fixedly connected by an interference fit and work together with the seventh sealing ring 22 to seal the coil assembly 17, thus forming an axial compression and circumferential seal on the internal coil assembly 17, effectively protecting the coil assembly 17 from the intrusion of the external environment and the leakage of the internal medium.

[0035] The air suspension stiffness solenoid valve without magnetic shielding ring in this embodiment also includes a base plate 23. The base plate 23 is disposed at the end of the yoke 15 away from the valve body 11 and is sleeved with the mounting positioning ring 1. The mounting positioning ring 1 and the base plate 23 together constitute the housing of the encapsulated coil assembly 17, encapsulating the coil assembly 17 inside, thereby providing a stable mechanical protection and electromagnetic shielding environment for the electromagnetic drive part.

[0036] In this embodiment, when the air suspension stiffness solenoid valve without a magnetic ring is in use, the electromagnetic force generated by the coil assembly 17 drives the armature 19 to overcome the preload of the spring 5 and move towards the auxiliary stop 14. The armature 19 drives the valve core 6 to move axially through the push rod 16, so that the sealing gasket 9 at the end of the valve core 6 is pressed against the conical valve seat of the valve body 11 to form a reliable seal. At this time, the passage between the air inlet and the exhaust port is blocked, and the solenoid valve is in a closed and pressure-holding state. When the coil assembly 17 is de-energized, the electromagnetic force disappears, and the spring 5 releases its stored energy, pushing the armature 19 and the valve core 6 to move away from the valve seat to reset, so that the sealing gasket 9 separates from the conical valve seat, and the air inlet and the exhaust port are restored to communication. The solenoid valve is in an open state to realize the air intake or exhaust function.

[0037] The air suspension stiffness solenoid valve without a magnetic isolation ring in this embodiment forms a closed magnetic circuit through the stop 3, yoke 15, pole shoe 21 and armature 19, all made of magnetically conductive material. Combined with the optimized magnetic circuit structure, such as the groove 30 or spiral groove 31 on the surface of the stop 3, the magnetic flux utilization efficiency is significantly improved, enabling a larger effective electromagnetic force to be output with the same size and power consumption. Simultaneously, it eliminates the traditional independent magnetic isolation ring and complex guiding components, adopting a diaphragm 18 guide and a multi-stage step-based limiting method, fundamentally avoiding motion jamming caused by lateral magnetic attraction, improving the reliability of the solenoid valve under long-term high-frequency operation. Structurally, it eliminates the need for processing and assembling high-precision magnetic isolation rings and dedicated non-magnetic guiding components, reducing production costs and process difficulty. Through the combination of multi-stage sealing rings and diaphragm seals, reliable static and dynamic sealing of the coil cavity, valve cavity and various interfaces is achieved, effectively preventing leakage and contamination intrusion. Combined with the wear-resistant and corrosion-resistant coating on the surface, the product's service life in harsh environments is further enhanced.

[0038] The air suspension stiffness solenoid valve without magnetic ring of the present invention has achieved significant improvements over the traditional magnetic ring solenoid valve in terms of reliability, response speed, electromagnetic efficiency, manufacturing cost and sealing durability. It is especially suitable for modern vehicle air suspension systems with strict requirements for reliability, response speed and space.

[0039] The embodiments described above are merely preferred embodiments of the present invention and are not intended to limit the scope of the present invention. Various modifications and improvements made by those skilled in the art to the technical solutions of the present invention without departing from the spirit of the present invention should fall within the protection scope defined by the claims of the present invention.

Claims

1. A solenoid valve for air suspension stiffness without a magnetic isolation ring, characterized in that, The device includes a valve body (11), a valve core (6), and an electromagnetic drive assembly. The valve core (6) is axially movable and installed inside the valve body (11). The bottom of the valve body (11) is provided with a conical valve seat and an exhaust port is provided on the side wall. The conical valve seat is connected to several air inlets. The electromagnetic drive assembly includes a mounting plate (8), a yoke (15), a pole shoe (21), a stop (3), an armature (19), an auxiliary stop (14), and a push rod (16). The yoke (15) has a first through hole (25) inside. The first through hole (25) is provided with a coil assembly (17), which is plastically encased in the pole shoe (21). The stop iron (3) is fixedly disposed inside the yoke (15) by the mounting plate (8). The yoke (15), the pole shoe (21), the armature (19), and the stop iron (3) together form a closed magnetic circuit. The stop iron (3) is provided with a second through hole (29) and a first step (33) inside, and its outer surface is provided with a magnetic circuit optimization structure. The second through hole (29) The magnetic circuit optimization structure includes a groove (30) and / or a spiral groove (31) and an interference fit with the stop cover (2). The armature (19) and the auxiliary stop (14) are disposed in the first step (33), and a thin film (18) is provided between the armature (19) and the inner wall of the first step (33). The auxiliary stop (14) is provided with a second step (34), a third step (35) and a fourth step (36) in sequence inside. The top rod (16) penetrates the inner wall of the auxiliary stop (14). One end of the hole is connected to the armature (19), and the other end is connected to the valve core (6). The push rod (16) is fitted with a spring (5), and one end of the spring (5) is installed in the second step (34), and the other end abuts against the armature (19). One end of the valve core (6) is connected to the third step (35), and the other end is covered with a sealing gasket (9) to form a sealing surface. By sealing or separating the sealing surface from the conical valve seat, the air inlet and the exhaust port can be disconnected or connected.

2. The air suspension stiffness solenoid valve without a magnetic isolation ring according to claim 1, characterized in that, The stop (3), armature (19), yoke (15), pole shoe (21) and mounting plate (8) are all made of magnetic metal material, while the valve body (11), valve core (6), push rod (16), spring (5) and sealing gasket (9) are all made of non-magnetic material.

3. The air suspension stiffness solenoid valve without a magnetic isolation ring according to claim 1, characterized in that, The surfaces of the stop (3), armature (19), yoke (15), pole shoe (21) and mounting plate (8) are all coated with a wear-resistant and corrosion-resistant coating.

4. The air suspension stiffness solenoid valve without a magnetic isolation ring according to claim 1, characterized in that, A gasket (4) is fitted between the end face of the auxiliary stop (14) and the armature (19), and the gasket (4) is made of a non-magnetic material.

5. The air suspension stiffness solenoid valve without a magnetic isolation ring according to claim 1, characterized in that, The yoke (15) has a fifth step (26) and a sixth step (27) at its two ends respectively. The fifth step (26) is interference-fitted with the mounting plate (8), and the sixth step (27) is fitted with a first sealing ring (20).

6. The air suspension stiffness solenoid valve without a magnetic isolation ring according to claim 1, characterized in that, The outer surfaces of the two ends of the stop (3) are respectively provided with a seventh step (28) and an eighth step (32). The seventh step (28) is in clearance fit with the pole shoe (21), and a second sealing ring (24) is assembled between the front end of the eighth step (32) and the valve body (11).

7. The air suspension stiffness solenoid valve without magnetic isolation ring according to claim 1, characterized in that, A third sealing ring (13) is installed between the valve core (6) and the third step (35), and a fourth sealing ring (7) is installed between the valve core (6) and the fourth step (36).

8. The air suspension stiffness solenoid valve without magnetic isolation ring according to claim 1, characterized in that, The valve body (11) is equipped with a fifth sealing ring (10) and a sixth sealing ring (12) on its outer periphery. The sixth sealing ring (12) is installed at the connection between the valve body (11), the mounting plate (8) and the yoke (15).

9. A magnetic ring-free air suspension stiffness solenoid valve according to any one of claims 1-8, characterized in that, The electromagnetic drive assembly also includes a mounting positioning ring (1), the yoke (15) is press-fitted with the mounting positioning ring (1), and a seventh sealing ring (22) is used to seal the coil assembly (17).

10. The air suspension stiffness solenoid valve without a magnetic isolation ring according to claim 9, characterized in that, It also includes a base plate (23), which is located at the end of the yoke (15) away from the valve body (11) and is sleeved with the mounting positioning ring (1). The mounting positioning ring (1) and the base plate (23) together form a housing for encapsulating the coil assembly (17).

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