Electromagnetic valve for adjusting rigidity of air spring

Abstract

The utility model provides an electromagnetic valve for adjusting rigidity of an air spring, which relates to the technical field of electromagnetic valves, and comprises a shell, a connector and a valve seat, a coil assembly and an armature are arranged in the shell, the lower end of the armature is connected with a connecting rod, the lower end of the connecting rod is connected with a piston assembly, and the valve seat is provided with a valve cavity and a valve port communicated with the valve cavity; the lower end of the wiring terminal is connected with the coil assembly, and the upper end of the wiring terminal is exposed out of the upper end face of the connector. The lower end of the connector extends downwards in the axial direction to be close to the lower end face of the coil assembly, the connector is of an integrated structure formed outside the coil assembly and the wiring terminal in a plastic coating mode, and an interface surrounding the exposed portion of the wiring terminal is integrally formed in the upper end face of the connector. The electromagnetic valve for adjusting the rigidity of the air spring is high in structural strength, good in external pollution resistance, high in response speed and durable and safe to use.

Description

Technical Field

[0001] The utility model relates to the technical field of solenoid valves, in particular to a solenoid valve for adjusting the stiffness of an air spring. Background Art

[0002] At present, solenoid valves are often used in automobile air springs. They control the opening and closing of the valve by converting electrical signals into mechanical actions, isolating or connecting two chambers, thereby changing the air capacity in the air spring and achieving the purpose of changing the spring stiffness.

[0003] Air springs can adjust the height of the vehicle body and the hardness of the suspension. For example, lower the vehicle body when getting on or off the vehicle, and raise the vehicle body to improve passability when encountering complex roads. Only air springs with double chambers or above can adjust the hardness of the suspension through air springs, while single chamber air springs can only adjust the hardness of the suspension through shock absorbers. The stiffness valve discussed in this patent work is the pneumatic solenoid switch valve that controls the on-off of the air chamber described above.

[0004] There are many defects in the solenoid valve structure of the prior art, especially in the connection structure of the copper coil and the terminal, the copper wire is directly wound on the coil frame without external protection measures. Under this structure, in a large vibration environment, the initial tension of the copper wire cannot be better protected, and it is easy to have the risk of gradual loosening in durable applications. At the same time, once the external contaminants of the shell enter the solenoid valve, they will directly adhere to the copper wire and the welding point between the copper wire and the terminal, which can directly corrode both of them, and there is a risk of local short circuit in durable applications, and in severe cases, it will cause burning and disconnection. Summary of the invention

[0005] In order to overcome at least one of the defects in the above prior art, the utility model provides a solenoid valve for adjusting the stiffness of an air spring, which has high structural strength, good resistance to external pollution, and is durable and safe to use.

[0006] The utility model provides a solenoid valve for adjusting the stiffness of an air spring: it comprises a shell, a connector and a valve seat, the upper and lower ends of the shell are respectively connected to the outside of the connector and the valve seat, and is characterized in that: a coil assembly and an armature slidably mounted on the coil assembly along the axial direction are arranged in the shell, the lower end of the armature is connected to a connecting rod, the lower end of the connecting rod is connected to a piston assembly, and a valve cavity and a valve port connected thereto are opened on the valve seat; a wiring terminal is arranged on the connector, the lower end of the wiring terminal is connected to the coil assembly, and the upper end is exposed on the upper end face of the connector; the lower end of the connector extends downward along the axial direction to be close to the lower end face of the coil assembly, the connector is an integrated structure that is overmolded outside the coil assembly and the wiring terminal, and the upper end face of the connector is integrally formed with an interface that surrounds the exposed part of the wiring terminal.

[0007] Compared with the prior art, the solenoid valve for adjusting the stiffness of the air spring of the utility model has the following advantages:

[0008] In the solenoid valve structure for adjusting the stiffness of the air spring of the utility model, the components of the traditional solenoid valve are structurally changed, and the design and addition of the plastic coating process after the copper wire winding and the terminal block insertion are emphasized, that is, the coil assembly, the terminal block and the connector are integrated into one by injection molding, and the external interface (wiring harness interface) is manufactured by the plastic coating process; thereby, the tightness and structural strength of the original structure are enhanced, and at the same time, the ability of the solenoid valve to resist external pollution is increased through the protection of the plastic coating wall thickness, especially the protection of the copper wire part of the coil assembly and the corrosion resistance of the terminal block is improved, thereby eliminating the risk of short circuit and short circuit during use and ensuring safety of use.

[0009] Furthermore, the coil assembly includes a coil frame and copper wire wound on the outside of the coil frame, and two groups of winding poles are provided at the upper end of the coil frame. The two ends of the copper wire are respectively tightened and wound on the two winding poles and are respectively connected to the lower ends of the terminal blocks.

[0010] As an improvement, a positioning slot is further provided at the upper end of the coil skeleton near the winding post, and the lower end of the terminal block is inserted and positioned in the positioning slot; a bending clamping portion is also provided at the lower end of the terminal block, each group of the winding posts includes two columns, a notch is left between the two columns, and when the end of the copper wire is horizontally wound around the winding post, a horizontal copper wire group is formed in the notch, the bending clamping portion is clamped on the outside of the horizontal copper wire group, and the bending clamping portion and the horizontal copper wire group are fixed by resistance welding.

[0011] As a further improvement, a guide sleeve with its opening facing downward is installed in the inner hole of the coil assembly, the armature is slidably installed in the guide sleeve, and a PTFE coating is provided on the radial outer peripheral wall of the armature.

[0012] As a further improvement, a magnetic conductive cover plate is arranged between the top wall of the coil assembly and the connector, a through hole is opened in the middle of the magnetic conductive cover plate and is sleeved on the outside of the guide sleeve, and at least two groups of permanent magnets evenly distributed along the circumferential direction are embedded on the inner wall of the through hole.

[0013] Further improved, the piston assembly includes a piston body, a dynamic seal is arranged between the radial outer periphery of the piston body and the inner wall of the valve chamber, the piston body is integrally injection molded at the lower end of the connecting rod or is connected to the lower end of the connecting rod by press fitting, and an end face seal is arranged at the position of the lower end of the piston body corresponding to the valve port.

[0014] As a structural form, the dynamic seal includes a sealing ring and a guide ring, which are arranged axially and spaced apart to seal between the radial outer wall of the piston body and the radial inner wall of the valve chamber, and the sealing ring is a special-shaped sealing ring.

[0015] As another structural form, the dynamic seal includes a sealing ring and an auxiliary sealing ring, and the sealing ring and the auxiliary sealing ring are arranged tightly along the radial direction to seal between the radial outer wall of the piston body and the radial inner wall of the valve chamber, and the auxiliary sealing ring is located at the radial outer end of the sealing ring.

[0016] As a further improvement, the end face seal is connected to the lower end of the piston body by rubber coating through a vulcanization process, and the lower end of the end face seal forms a sealing plane for sealing the valve port.

[0017] As a further improvement, the upper end face of the end face seal is convexly formed with a plurality of circumferentially distributed limiting protrusions, and a limiting step is also provided on the valve seat. When the piston assembly moves upward to the limit position, the upper end faces of the plurality of limiting protrusions abut against the lower end faces of the limiting steps.

[0018] Other improved features and advantages of the utility model will be described in the subsequent specific embodiments, and partly become apparent from the description, or understood by implementing the utility model. The purpose and other advantages of the utility model can be achieved and obtained through the structures specifically pointed out in the description and the drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a three-dimensional structural diagram of the electromagnetic valve for adjusting the stiffness of the air spring of the utility model;

[0020] Figure 2 It is a cross-sectional view of the first embodiment of the solenoid valve for adjusting the stiffness of an air spring of the utility model;

[0021] Figure 3 This is a schematic diagram of the connection structure between the wiring terminal and the coil assembly in the utility model;

[0022] Figure 4 Another angle sectional view of the solenoid valve for adjusting the stiffness of the air spring of the utility model; (mainly showing the connection structure between the wiring terminal and the coil assembly)

[0023] Figure 5 It is a schematic diagram of the structure of the coil skeleton in the utility model;

[0024] Figure 6 The dynamic sealing structure and the end face sealing structure in the first embodiment of the utility model;

[0025] Figure 7 It is a cross-sectional view of a second embodiment of the solenoid valve for adjusting the stiffness of an air spring of the utility model;

[0026] Figure 8 This is a disassembled diagram of the connection structure between the connector and the coil assembly in the second embodiment of the solenoid valve for adjusting the stiffness of the air spring of the utility model;

[0027] Fig. 9 It is a partial cross-sectional view of the third embodiment of the solenoid valve for adjusting the stiffness of an air spring of the utility model;

[0028] Fig.10 A partial cross-sectional view of a fourth embodiment of the solenoid valve for adjusting the stiffness of an air spring of the utility model;

[0029] Fig.11 It is a cross-sectional view of the special-shaped ring in the utility model.

[0030] Description of reference numerals:

[0031] 1. Shell; 2. Connector; 3. Armature; 4. Connecting rod; 5. Terminal block; 6. Interface; 7. Coil skeleton; 8. Copper wire; 9. Winding post; 10. Positioning slot; 11. Bending clamping part; 12. Notch; 13. Guide sleeve; 14. Magnetic cover plate; 15. Permanent magnet; 16. Piston body; 17. Sealing ring; 18. Guide ring; 19. End seal; 20. Limiting protrusion; 21. Limiting step; 22. Magnetic tube; 23. Base; 24. Upper concave cavity; 25. Lower concave cavity; 26. Elastic element; 27. Pre-tightening protrusion; 28. Positioning plug; 29. ​​Positioning protrusion; 30. Positioning groove; 31. Avoidance groove; 32. Buffer pad; 33. Auxiliary sealing ring; 34. First lip edge; 35. Second lip edge. DETAILED DESCRIPTION

[0032] First, those skilled in the art should understand that these implementations are only used to explain the technical principles of the embodiments of the present application, and are not intended to limit the protection scope of the embodiments of the present application. Those skilled in the art can make adjustments to them as needed to adapt to specific application scenarios.

[0033] In the description of the embodiments of the present application, it should be noted that, unless otherwise clearly specified and limited, the terms "fixed" and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium. For ordinary technicians in this field, the specific meanings of the above terms in the embodiments of the present application can be understood according to specific circumstances.

[0034] The present application is further described in detail below with reference to the accompanying drawings and specific embodiments.

[0035] Embodiment 1:

[0036] See also Figure 1 to Figure 6 As shown, an embodiment of the present application discloses a solenoid valve for adjusting the stiffness of an air spring, comprising a shell 1, a connector 2 and a valve seat, wherein the upper and lower ends of the shell 1 are respectively connected to the outside of the connector 2 and the valve seat, thereby fixing the connector 2 and the valve seat. Specifically, a clamping step is provided on the outer peripheral wall of the connector 2 and the base 23, and a clamping portion bent radially inward is provided on the upper and lower ends of the shell 1, and the clamping portions at both ends are respectively mounted on the clamping steps of the connector 2 and the base 23.

[0037] In addition, in this embodiment, see the attached Figure 2 A coil assembly and an armature 3 slidably mounted in the coil assembly along the axial direction are arranged in the housing 1, a connecting rod 4 is connected to the lower end of the armature 3, a piston assembly is connected to the lower end of the connecting rod 4, a valve port is opened on the valve seat, the armature 3 is lifted and lowered in the coil assembly to drive the connecting rod 4 to lift and lower together with the piston assembly to realize the opening and closing of the valve port; a terminal 5 is arranged on the connector 2, the lower end of the terminal 5 is connected to the coil assembly, and the upper end of the terminal 5 is exposed on the upper end face of the connector 2; the lower end of the connector 2 extends downward along the axial direction to be close to the lower end face of the coil assembly, the connector 2 is an integrated structure that is overmolded on the outside of the coil assembly and the terminal 5, and the upper end face of the connector 2 is integrally formed with an interface 6 that surrounds the exposed part of the terminal 5.

[0038] In the structure of this embodiment, the components of the traditional solenoid valve are structurally changed, with emphasis on the design and addition of a plastic coating process after the copper wire 8 is wound and the terminal 5 is inserted, that is, the coil assembly, the terminal 5 and the connector 2 are integrated by injection molding, and the external interface 6 (wiring harness interface) is manufactured by the plastic coating process; thereby, the tightness and structural strength of the original structure are enhanced, and at the same time, through the protection of the plastic coating wall thickness, the ability of the solenoid valve to resist external pollution is increased, especially the protection of the copper wire 8 part of the coil assembly and the corrosion resistance of the terminal 5 is improved.

[0039] Preferably, continue to participate in the attached Figure 2 , 3and 4, the coil assembly includes a coil skeleton 7 and a copper wire 8 wound on the outside of the coil skeleton 7, and a winding post 9 is provided at the upper end of the coil skeleton 7, the end of the copper wire 8 is tautly wound on the winding post 9, and connected to the lower end of the terminal 5. Specifically, the terminal 5 includes positive and negative pole plug-in posts, and the winding post 9 is also two groups, each group of winding posts 9 includes two columns, and a notch 12 is left between the two columns, and when the end of the copper wire 8 is horizontally wound around the winding post 9, a horizontal copper wire 8 group is formed in the notch 12, and the bending clamping part 11 is clamped on the outside of the horizontal copper wire 8 group, and the bending clamping part 11 is fixed to the horizontal copper wire 8 group by resistance welding, so that the lower ends of the positive and negative pole plug-in posts are respectively connected to the two horizontal copper wire 8 groups, and the connection here includes both It not only includes mechanical structure connection, but also realizes conductive connection; more specifically, two positioning slots 10 are provided at the upper end of the coil skeleton 7 near the winding post 9, and the lower ends of the positive and negative pole plug-in posts of the terminal block 5 are respectively inserted and positioned in the two positioning slots 10; the lower ends of the positive and negative pole plug-in posts of the terminal block 5 are also respectively provided with bending clamping parts 11, and the two bending clamping parts 11 are respectively clamped on the outside of the two horizontal copper wires 8 groups, and the bending clamping parts 11 and the horizontal copper wires 8 groups are connected and fixed by resistance welding.

[0040] In the above structure of the present application, a winding post 9 is provided on the coil frame 7, so that the copper wire 8 has a reliable and stable wire tension after being wound on the winding post 9. At the same time, a positioning slot 10 is provided on the coil frame 7 to achieve reliable assembly of the lower end of the terminal 5 in the positioning slot 10. See the attached Figure 4 ; The above two points provide a reliable relative position for the bending action of the welding type terminal 5, and the clamping of the bending clamping part 11 and the resistance welding realize the reliable connection between the terminal 5 and the horizontal copper wire 8 group; in this structure, the lower end of the terminal 5 and the positioning slot 10 adopt an interference fit, and the lower end of the terminal 5 is provided with a barb structure, which forms a locking force after being inserted into the positioning slot 10, which is conducive to further maintaining the posture of the entire terminal 5, reducing the relative displacement between the welding point and the copper wire 8 in the application environment, and improving the connection reliability. Finally, the integral overmolding process of the connector 2 is used to form an integrated structure.

[0041] On the other hand, participating in Figure 2 It can be seen that the inner hole of the coil assembly is equipped with a guide sleeve 13 with an opening facing downward, the armature 3 is slidably mounted in the guide sleeve 13, and a PTFE coating is provided on the radial outer peripheral wall of the armature 3. The present application further enhances the surface wear resistance of the armature 3 under axial reciprocating motion by adding a PTFE coating to the outer peripheral wall of the armature 3. At the same time, the PTFE coating is thinner in form, which is conducive to improving the magnetic conductivity efficiency of the solenoid valve and the electromagnetic force. In addition, the bonding force of the coating is stable and consistent, and the potential risk of installation defects during installation and use is low, and the reliability is stronger.

[0042] On the other hand, the PTFE coating plays a lubricating role to a certain extent, reducing the friction coefficient between the armature 3 and the inner wall of the guide sleeve 13. From another perspective, it can improve the response speed of the entire solenoid valve.

[0043] In addition, referring to the attached drawings, a magnetic cover plate 14 is provided between the top wall of the coil assembly and the connector 2, a through hole is provided in the middle of the magnetic cover plate 14 and is sleeved on the outside of the guide sleeve 13, and at least two groups of permanent magnets 15 evenly distributed along the circumferential direction are embedded on the inner wall of the through hole. Preferably, two arc-shaped embedding grooves are symmetrically provided on the inner hole wall of the magnetic cover plate 14, and two permanent magnets 15 are embedded in each embedding groove, see the attached drawings. Figure 4 Specifically, the permanent magnet is also an arc-shaped structure, similar to a tile structure. The upper limit of the electromagnetic force of the solenoid valve is constrained by the fixed assembly size and the outer diameter of the coil. The present application uses a design in which a tile-type permanent magnet 15 is installed in a slot in the magnetic conductive cover plate 14, thereby effectively improving the magnetic conductivity of the solenoid valve without changing the spatial size.

[0044] What needs to be noted about this structure is that since the connector 2 is integrally molded on the outside of the coil assembly, the terminal block 5 and the magnetic cover plate 14, the molding process is in a high temperature environment, which will cause the permanent magnet 15 to be demagnetized. Therefore, in this structure, the permanent magnet 15 is installed later, that is, after the connector 2 is integrally molded by molding, the permanent magnet 15 is installed from the inner hole of the magnetic cover plate 14 into the corresponding embedding groove.

[0045] In this embodiment, see the attached Figure 6 The piston assembly includes a piston body 16, a dynamic seal is provided between the radial outer periphery of the piston body 16 and the inner wall of the valve cavity of the valve seat, the piston body 16 is integrally injection molded at the lower end of the connecting rod 4, and an end face seal 19 is provided at the position of the lower end of the piston body 16 corresponding to the valve port. In some other embodiments, the piston body 16 is a metal part, and the piston body 16 is connected to the lower end of the connecting rod 4 by an interference fit.

[0046] Preferably, the dynamic seal includes a sealing ring 17 and a guide ring 18, and the sealing ring 17 and the guide ring 18 are spaced apart in the axial direction and are slidably arranged between the radial outer wall of the piston body 16 and the radial inner wall of the valve cavity. Referring to the attached drawings, two sealing grooves spaced apart in the axial direction are provided on the outer peripheral wall of the piston body 16, and the sealing ring 17 and the guide ring 18 are respectively snap-fitted into the upper and lower sealing grooves, and the sealing ring 17 here is preferably a special-shaped sealing ring, and can also be replaced by a star-shaped special-shaped sealing ring; the guide ring 18 is made of PTFE material; and for the convenience of installation, an inclined opening is provided in the middle of the guide ring 18, and the opening is axially connected to the guide ring 18. In this structure, the guide ring 18 mainly plays a guiding and supporting role.

[0047] In this structure, the special-shaped sealing ring refers to a sealing ring 17 whose cross section is an unconventional structure. Two first lip edges 34 are arranged on the radial inner side of the special-shaped sealing ring, and two second lip edges 35 are arranged on the radial outer side of the special-shaped sealing ring. The two first lip edges 34 and each adjacent first lip edge 34 and second lip edge 35 are transitioned by a concave arc surface, and the two second lip edges 35 are transitioned by a V-shaped groove, so that the protruding length of the two second lip edges 35 is greater than the protruding length of the two first lip edges 34. Specifically, its radial inner part is similar to the structure of a conventional star-shaped sealing ring, and the radial outer side and the dynamic sealing half of the inner wall of the valve cavity are of a K-type structure; that is, there are two sealing lips with a V-shaped angle on the radial outer side of the special-shaped sealing ring. The characteristics of this structure are: a grease storage cavity is formed in the angled inner cavity, and the longer sealing lip has more wear allowance than the conventional star-shaped sealing ring structure; and this structure has a relatively small contact area during dynamic sealing, thereby reducing friction resistance and ensuring better dynamic response speed, so that the dynamic seal can ensure a balance between durability and fast response performance.

[0048] In the conventional air suspension solenoid valve structure, the dynamic sealing structure between the piston and the valve chamber includes a sealing body made of elastic material, two axially spaced radially outer sealing lips and two axially spaced radially inner sealing lips; in addition, a support body capable of carrying the sealing body is required; the support body is composed of a harder material than the sealing body, and has a radially exposed portion extending axially between the two sealing lips, and serves as a guide portion having an axial guiding function for the movable part. In order to achieve a sealing effect when the central axis moves axially relative to the fixed part, this type of structure will be designed in the form of an assembly, and the outer cylindrical surface of the assembly is a harder engineering plastic material, and needs to be indirectly fixed by an interference fit with the fixed part. This dynamic sealing assembly has a complex structure, and the elastic sealing body needs to be vulcanized on the plastic support body, and the plastic support body needs to be designed with a flow channel required for the vulcanization process. The manufacturing process is complex. At the same time, in order to achieve the sealing function, not only two axially spaced radially outward sealing lips are required, but also two axially spaced radially inward sealing lips are required, and the sealing structure is complex.

[0049] In this embodiment, the structure of the driving seal assembly is simplified by the cooperation of a simple special-shaped seal ring 17 and a PTF guide ring 18, and the interference fit between the seal ring and the inner wall of the sleeve is simplified to effectively reduce the production cost.

[0050] In the above structure of the present embodiment, an engineering plastic piston body 16 is used to replace the conventional aluminum piston body 16, and the piston body 16 is overmolded on the copper connecting rod 4 by using the injection molding process, which replaces the press-fitting process of the piston body 16 and the connecting rod 4 in the prior art, thereby simplifying the assembly steps; and the integrated overmolding structure has a more reliable structural strength compared to the original interference fit combination, and improves the problem of contaminants caused by press-fitting debris during the press-fitting process.

[0051] In addition, in this embodiment, continue to refer to the attached Figure 6 It can be seen that the end face seal 19 is connected to the lower end of the piston body 16 by rubber coating through a vulcanization process, and the lower end of the end face seal 19 forms a sealing plane for sealing the valve port. The upper end face of the end face seal 19 is convexly formed with a plurality of circumferentially distributed limiting protrusions 20, and a limiting step 21 is also provided on the valve seat. When the piston assembly moves upward to the limit position, the upper end faces of the plurality of limiting protrusions 20 abut against the lower end faces of the limiting steps 21. In this structure, the end face seal is coated on the plastic piston end face by a vulcanization process, the vulcanized lower surface is used for the end face seal, and the vulcanized upper surface is a protruding 4-6 limiting protrusions 20, preferably a special-shaped triangular protrusion, which buffers the impact force at the end of the piston return stroke and cuts off the piston return stroke movement; at the same time, the number of parts is reduced and the assembly process is simplified.

[0052] See attached Figure 6 The valve seat includes an axially connected magnetic tube 22 and a base 23. The upper end of the magnetic tube 22 is mounted on the open end of the guide sleeve 13, and the lower end of the magnetic tube 22 is provided with an inwardly concave upper cavity 24; the middle part of the upper end of the base 23 is inwardly concave to form a lower cavity 25, and the lower cavity 25 and the upper cavity 24 form a valve cavity, and the lower end surface of the magnetic tube 22 and the inner wall of the lower cavity 25 form a limiting step 21.

[0053] In addition, see Appendix Figure 2 and 4 The base 23 is provided with an inlet and an outlet respectively connected to the valve cavity; the lower end of the connecting rod 4 slides through the magnetic tube 22 and extends into the valve cavity, and an elastic element 26 is arranged between the upper end of the magnetic tube 22 and the lower end of the armature 3. Specifically, an upper positioning groove is arranged at the lower end of the armature 3, and a lower positioning groove is arranged at the top of the magnetic tube 22. The elastic element 26 is a cylindrical spring, and the upper and lower ends of the spring are respectively limited in the upper positioning groove and the lower positioning groove.

[0054] On the other hand, in the present embodiment, a plurality of outwardly protruding pre-tightening bosses 27 are formed at the bottom of the coil skeleton 7, and the lower ends of the plurality of pre-tightening bosses 27 are cones with gradually decreasing diameters. When the coil assembly and the outer shell 1 are installed, the plurality of pre-tightening bosses 27 can play the role of axial pre-tightening force, thereby preventing the force from being transmitted to the copper wire 8 when installing the outer shell 1 and affecting its performance.

[0055] In addition, in the above structure, at least one positioning pin 28 is protrudingly formed at the bottom of the coil skeleton 7, and correspondingly, a positioning hole for the positioning pin 28 to be inserted and matched is provided on the end face of the magnetic tube 22 that abuts against the coil skeleton 7, so as to ensure the stability of the coil skeleton 7 after connection and prevent circumferential rotation.

[0056] Embodiment 2:

[0057] See attached Figure 7 and 8 The basic structure of this embodiment is the same as that of the first embodiment. The only difference is that in this embodiment, no plastic coating structure is provided on the outside of the coil assembly, that is, the connector 2 does not adopt the overall plastic coating process. It is an independent cover body, and an interface 6 is formed on the cover body. A plug-in hole is provided at the bottom of the interface 6 for the upper end of the terminal 5 to pass through; accordingly, a plurality of positioning protrusions 29 distributed along its circumference are provided at the lower end of the connector 2, and corresponding positioning grooves 30 are provided on the outer periphery of the magnetic conductive cover plate 14. When the connector 2 is vertically installed to the upper end of the coil assembly, the plurality of positioning protrusions 29 are respectively matched with the positioning grooves 30. In addition, in this structure, an air avoidance groove 31 is provided on the connector 2 at a position corresponding to the winding post 9 at the top of the coil skeleton 7 to avoid interference with the connection structure of the terminal 5 and the copper wire 8.

[0058] In the above structure, preferably, the positioning protrusion 29 and the positioning groove 30 are both crescent-shaped structures, and the crescent-shaped protrusion feature is used to position and turn, so that the connector 2 can be easily installed. This structure is used in occasions where there are no high requirements for anti-pollution and construction strength.

[0059] In addition, when the connector 2 adopts the split structure of this embodiment, the permanent magnet 15 can be pre-installed into the magnetic conductive cover plate 14, and then the magnetic conductive cover plate 14 is assembled to the outside of the guide sleeve.

[0060] Embodiment three:

[0061] See attached Fig. 9 The general structure of this embodiment is the same as that of the first embodiment, and the only difference is that the dynamic seal in this embodiment includes a sealing ring 17 and an auxiliary sealing ring 33. The sealing ring 17 and the auxiliary sealing ring 33 are arranged closely in the radial direction and are sealed between the radial outer wall of the piston body 16 and the radial inner wall of the valve cavity, and the auxiliary sealing ring 18 is located at the radial outer end of the sealing ring. In this structure, the auxiliary sealing ring 33 needs to play a sealing role, and also play a role in reducing friction resistance and improving response speed. The auxiliary sealing ring 33 here is a sealing ring with FTFE material added, and is a complete annular structure. The FTFE material has a low friction coefficient and strong wear resistance, and the main material is still rubber material, that is, the auxiliary sealing ring 33 has a certain elastic deformation performance, which is convenient for it to be installed in the sealing groove.

[0062] Specifically, a sealing groove is opened on the outer wall of the piston body 16, the sealing ring 17 is arranged on the radial inner side, the auxiliary sealing ring 33 is arranged on the radial outer side, and the inner wall of the sealing ring 17 is sealed with the radial inner wall of the sealing groove, the outer wall of the sealing ring 17 is sealed with the inner wall of the auxiliary sealing ring 33, and the outer wall of the auxiliary sealing ring 33 is sealed with the inner wall of the valve cavity; in this structure, an arc-shaped groove is provided on the side where the auxiliary sealing ring 33 and the sealing ring 17 are in contact with each other, so as to better ensure that the sealing ring 17 is stable in the center position in the axial direction.

[0063] Embodiment 4:

[0064] Participate in the Fig.10 This embodiment is improved on the basis of the third embodiment or the first embodiment, and most of its structures are the same as those of the third embodiment or the first embodiment. The only difference is that the structure of the end face seal 19 is changed in this embodiment. Specifically, the limit convex block 20 structure used for the end face seal to play a buffering role is designed separately from the end face seal. That is, at the lower end of the piston body 16, only the end face seal 19 that is vulcanized and rubber-coated to cooperate with the valve port is required, and the buffer structure is arranged between the top of the piston body 16 and the top wall of the valve cavity, specifically, an annular buffer pad 32 is embedded on the top wall of the upper concave cavity 24 of the magnetic conductive tube 22. The structure of the attached figure only shows the structure that has been changed on the basis of the third embodiment, and does not reflect the structure that has been changed on the basis of the first embodiment.

[0065] In this structure, when the sealing ring 17 and the guide ring 18 are arranged in an axially spaced arrangement, since two sealing grooves need to be opened on the outer wall of the piston body 16, the thickness ratio of the buffer 32 installed on the top of the piston body 16 will be insufficient. At this time, the buffer 32 is selected to be embedded in the top wall of the upper concave cavity 24; of course, if conditions permit, the buffer 32 can also be embedded in the upper end face of the piston body 16.

[0066] When the sealing ring 17 and the guide ring 18 are arranged radially, the thickness of the buffer 32 on the top of the piston body 16 is usually sufficient, so the buffer 32 is preferably embedded in the upper end surface of the piston body 16; of course, it can also be embedded in the top wall of the upper cavity 24.

[0067] In the description of the present application, the description with reference to the terms "present embodiment", "some embodiments", etc. means that the specific features, mechanisms, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present application. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, mechanisms, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine the different embodiments or examples described in this specification and the features of the different embodiments or examples, without contradicting each other.

[0068] The above is only a specific implementation of the present application, but the protection scope of the present application is not limited thereto. Any changes or substitutions that can be easily thought of by a person skilled in the art within the technical scope disclosed in the present application should be included in the protection scope of the present application. Therefore, the protection scope of the present application shall be based on the protection scope of the claims.

Claims

1. A solenoid valve for adjusting the stiffness of an air spring, comprising a housing (1), a connector (2) and a valve seat, wherein the upper and lower ends of the housing (1) are respectively connected to the outside of the connector (2) and the valve seat, and characterized in that: The housing (1) is provided with a coil assembly and an armature (3) slidably mounted on the coil assembly in the axial direction, the lower end of the armature (3) is connected to a connecting rod (4), the lower end of the connecting rod (4) is connected to a piston assembly, and the valve seat is provided with a valve cavity and a valve port connected thereto; the connector (2) is provided with a wiring terminal (5), the lower end of the wiring terminal (5) is connected to the coil assembly, and the upper end is exposed on the upper end surface of the connector (2); the lower end of the connector (2) extends axially downward to be close to the lower end surface of the coil assembly, the connector (2) is an integrated structure that is overmolded on the outside of the coil assembly and the wiring terminal (5), and the upper end surface of the connector (2) is integrally formed with an interface (6) that surrounds the exposed portion of the wiring terminal (5).

2. The solenoid valve for adjusting the stiffness of an air spring according to claim 1, characterized in that: The coil assembly comprises a coil frame (7) and a copper wire (8) wound around the outside of the coil frame (7); two groups of winding posts (9) are provided at the upper end of the coil frame (7); two ends of the copper wire (8) are respectively tightened and wound around the two winding posts (9) and are respectively connected to the lower ends of the connecting terminals (5).

3. The solenoid valve for adjusting the stiffness of an air spring according to claim 2, characterized in that: A positioning slot (10) is also provided at the upper end of the coil frame (7) near the winding post (9), and the lower end of the terminal block (5) is inserted and positioned in the positioning slot (10); a bending clamping portion (11) is also provided at the lower end of the terminal block (5), each group of the winding posts (9) includes two columns, a notch (12) is left between the two columns, and when the end of the copper wire (8) is horizontally wound around the winding post (9), a horizontal copper wire (8) group is formed in the notch (12), the bending clamping portion (11) is clamped on the outside of the horizontal copper wire (8) group, and the bending clamping portion (11) and the horizontal copper wire (8) group are connected and fixed by resistance welding.

4. The solenoid valve for adjusting the stiffness of an air spring according to any one of claims 1 to 3, characterized in that: A guide sleeve (13) with its opening facing downward is installed in the inner hole of the coil assembly, the armature (3) is slidably installed in the guide sleeve (13), and a PTFE coating is provided on the radial outer peripheral wall of the armature (3).

5. The solenoid valve for adjusting the stiffness of an air spring according to claim 4, characterized in that: A magnetic conductive cover plate (14) is provided between the top wall of the coil assembly and the connector (2); a through hole is provided in the middle of the magnetic conductive cover plate (14) and is sleeved on the outside of the guide sleeve (13); at least two groups of permanent magnets (15) evenly distributed along the circumferential direction are embedded on the inner wall of the through hole.

6. The solenoid valve for adjusting the stiffness of an air spring according to claim 4, characterized in that: The piston assembly comprises a piston body (16), a dynamic seal is arranged between the radial outer periphery of the piston body (16) and the inner wall of the valve cavity, the piston body (16) is integrally injection-molded at the lower end of the connecting rod (4) or connected to the lower end of the connecting rod (4) by press-fitting, and an end face seal (19) is arranged at a position of the lower end of the piston body (16) corresponding to the valve port.

7. The solenoid valve for adjusting the stiffness of an air spring according to claim 6, characterized in that: The dynamic seal comprises a sealing ring (17) and a guide ring (18), wherein the sealing ring (17) and the guide ring (18) are arranged in an axially spaced manner and seal between the radial outer wall of the piston body (16) and the radial inner wall of the valve chamber.

8. The solenoid valve for adjusting the stiffness of an air spring according to claim 6, characterized in that: The dynamic seal comprises a sealing ring (17) and an auxiliary sealing ring (33), wherein the sealing ring (17) and the auxiliary sealing ring (33) are arranged closely in the radial direction and are sealed between the radial outer wall of the piston body (16) and the radial inner wall of the valve chamber, and the auxiliary sealing ring (33) is located at the radial outer end of the sealing ring.

9. The solenoid valve for adjusting the stiffness of an air spring according to claim 6, characterized in that: The end face seal (19) is connected to the lower end of the piston body (16) by rubber coating through a vulcanization process, and the lower end of the end face seal (19) forms a sealing plane for sealing the valve port.

10. The solenoid valve for adjusting the stiffness of an air spring according to claim 9, characterized in that: The upper end face of the end face seal (19) is formed with a plurality of circumferentially distributed limiting protrusions (20), and a limiting step (21) is also provided on the valve seat. When the piston assembly moves upward to the limit position, the upper end faces of the plurality of limiting protrusions (20) abut against the lower end faces of the limiting steps (21).

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