Electromagnetic valve applied to air spring

Abstract

The utility model provides an electromagnetic valve applied to an air spring, and relates to the technical field of electromagnetic valves, the electromagnetic valve comprises a shell, a connector and a coil assembly, the upper end of the shell is bent and connected to the outer wall of the connector, the connector is provided with a wiring terminal, and the coil assembly is connected with the connector. The coil assembly comprises a coil framework and a copper wire wound outside the coil framework, two groups of wrapping posts are arranged at the upper end of the coil framework, and two end parts of the copper wire are respectively tensioned and wound on the two groups of wrapping posts, so that horizontal copper wire windings are respectively formed at two ends of the copper wire; the lower end of the wiring terminal is respectively provided with a bending clamping part which is in clamping fit with the two copper wire windings, and the two bending clamping parts are respectively connected to the outer parts of the copper wire windings in a clamping manner. According to the electromagnetic valve applied to the air spring, the coil connecting structure is high in strength, the wiring position is prevented from loosening after being used for a period of time, and the use stability of the electromagnetic valve is guaranteed.

Description

Technical Field

[0001] The utility model relates to the technical field of solenoid valves, and in particular to a solenoid valve applied to 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 solenoid valve involved in this application is the pneumatic solenoid switch valve that controls the on / off of the air chamber mentioned above.

[0004] In the coil structure of the prior art solenoid valve, the connection between the terminal and the copper wire is achieved by manually winding and soldering the end of the copper wire at the terminal connection end. This connection method has low process control stability, and is easily affected by the initial tension of manual winding, solder quality, welding temperature, solder solidification degree, etc., which can easily cause the terminal and the copper wire to loosen, ultimately directly affecting the normal use of the solenoid valve. Summary of the invention

[0005] In order to overcome at least one defect in the above-mentioned prior art, the utility model provides a solenoid valve applied to an air spring, wherein the coil connection structure has high strength, thereby avoiding loosening of the connection after being used for a period of time, and ensuring the stability of the solenoid valve.

[0006] The utility model provides a solenoid valve applied to an air spring: comprising a shell, a connector and a coil assembly, the upper end of the shell is bent and connected to the outer wall of the connector, the connector is provided with a wiring terminal, the coil assembly comprises a coil skeleton and a copper wire wound on the outside of the coil skeleton, the upper end of the coil skeleton is provided with two groups of winding posts, the two ends of the copper wire are respectively tightened and wound on the two groups of winding posts, so that horizontal copper wire windings are respectively formed at the two ends of the copper wire, the lower ends of the wiring terminal are respectively provided with a bending clamping portion clamped with the two copper wire windings, and the two bending clamping portions are respectively clamped and connected to the outside of the copper wire winding.

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

[0008] In the solenoid valve structure applied to the air spring of the utility model, a winding post is provided on the coil skeleton, so that the copper wire has a reliable and stable wire tension after being wound on the winding post. At the same time, a bending clamping part is provided at the lower end of the terminal. The clamping of the bending clamping part and resistance welding are used to achieve a reliable connection between the terminal and the copper wire winding, which fully improves the stability of the connection between the coil and the terminal, avoids loosening of the connection after a period of use, and ensures the stability of the solenoid valve.

[0009] Furthermore, each group of the winding poles includes two poles with a slot left between the two poles, and the two ends of the copper wire are horizontally wound around the two corresponding groups of poles respectively to form a horizontal copper wire winding in the slot, and the bending clamping portion is fixed to the copper wire winding by resistance welding.

[0010] As an improvement, a positioning slot is further provided at the upper end of the coil frame near the winding post, the lower end of the wiring terminal is inserted and positioned in the positioning slot, and a barb structure is provided at the lower end of the wiring terminal.

[0011] As a further improvement, a plurality of outwardly protruding pre-tightening bosses are formed on the bottom of the coil frame.

[0012] As a further improvement, at least one positioning pin is formed outwardly on the bottom of the coil frame, and a positioning hole for the positioning pin to be inserted and matched is provided on the end surface of the magnetic conductive tube that abuts against the coil frame.

[0013] As a preferred structure, the lower end of the connector extends axially downward to be close to the lower end surface of the coil assembly, and the connector is an integrated structure that is overmolded on the outside of the coil assembly and the terminal block, and the upper end surface of the connector is integrally formed with an interface, and the upper end of the terminal block is located within the interface.

[0014] As another preferred structure, a magnetic conductive cover plate is arranged between the top wall of the coil assembly and the connector, and a plurality of circumferentially distributed positioning grooves are protruded outwardly from the lower end of the magnetic conductive cover plate, and a plurality of positioning protrusions respectively inserted into and matched with the positioning grooves are arranged at the lower end of the connector.

[0015] As a further improvement, a guide sleeve with its opening facing downward is installed in the inner hole of the coil assembly, 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.

[0016] 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

[0017] Figure 1 It is a cross-sectional view of the first embodiment of the solenoid valve applied to the air spring of the utility model;

[0018] Figure 2 This is a schematic diagram of the connection structure between the wiring terminal and the coil assembly in the utility model;

[0019] Figure 3 This is a cross-sectional view from another angle of the solenoid valve applied to the air spring of the utility model; (mainly showing the connection structure between the wiring terminal and the coil assembly)

[0020] Figure 4 It is a schematic diagram of the structure of the coil skeleton in the utility model;

[0021] Figure 5 It is a cross-sectional view of the second embodiment of the solenoid valve applied to the air spring of the utility model;

[0022] Figure 6 This is a disassembled view of the connection structure between the connector and the coil assembly in the second embodiment of the solenoid valve applied to the air spring of the utility model.

[0023] Description of reference numerals:

[0024] 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. Pre-tightening boss; 17. Positioning plug; 18. Positioning bump; 19. Positioning groove; 20. Avoidance groove; 21. Magnetic tube. DETAILED DESCRIPTION

[0025] 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.

[0026] 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.

[0027] The present application is further described in detail below with reference to the accompanying drawings and specific embodiments. Example

[0028] See also Figure 1 to Figure 4 As shown, an embodiment of the present application discloses a solenoid valve applied to 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.

[0029] In addition, in this embodiment, see the attached Figure 1 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 a connector 6 that surrounds the exposed part of the terminal 5.

[0030] 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 connector 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, the solenoid valve's ability to resist external pollution is increased through the protection of the plastic coating wall thickness, especially the protection of the copper wire 8 of the coil assembly and the corrosion resistance of the terminal 5 are improved.

[0031] Preferably, continue to participate in the attached Figure 1 ,2 and 3, 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.

[0032] 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 portion 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, 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.

[0033] On the other hand, participating in Figure 1 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.

[0034] In addition, see Appendix Figure 1 , 2A 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. At least two groups of permanent magnets 15 are evenly distributed along the circumferential direction and 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 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.

[0035] 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.

[0036] On the other hand, in the present embodiment, a plurality of outwardly protruding pre-tightening bosses 16 are formed at the bottom of the coil skeleton 7, and the lower ends of the plurality of pre-tightening bosses 16 are frustums with gradually decreasing diameters. When the coil assembly and the outer shell 1 are installed, the plurality of pre-tightening bosses 16 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.

[0037] In addition, in the above structure, at least one positioning pin 17 is protrudingly formed at the bottom of the coil skeleton 7, and correspondingly, a positioning hole 18 for the positioning pin 17 to be inserted and matched is provided on the end face of the magnetic tube 21 that abuts against the coil skeleton 7, so as to ensure the stability of the coil skeleton 7 after connection and prevent circumferential rotation. Example

[0038] See attached Figure 5 and 6 The basic structure of this embodiment is the same as that of the first embodiment. The only difference is that the connector 2 in this embodiment is not an integral plastic-coated structure. It is an independent plastic cover body. An interface 6 is formed on the cover body. A plug-in hole is set at the bottom of the interface 6 for the upper end of the terminal 5 to pass through. Accordingly, a plurality of positioning protrusions 18 distributed along its circumference are set at the lower end of the connector 2, and corresponding positioning grooves 19 are set 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 18 are respectively matched with the positioning grooves 19. In addition, in this structure, a clearance groove 20 is opened 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.

[0039] In the above structure, preferably, the positioning protrusion 18 and the positioning groove 19 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.

[0040] 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.

[0041] 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.

[0042] 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 an air spring, comprising a housing (1), a connector (2) and a coil assembly, wherein the upper end of the housing is bent and connected to the outer wall of the connector, and is characterized in that: The connector (2) is provided with a connecting terminal (5), the coil assembly comprises a coil frame (7) and a copper wire (8) wound around the outside of the coil frame (7), the upper end of the coil frame (7) is provided with two groups of winding posts (9), the two ends of the copper wire (8) are respectively tightened and wound around the two groups of winding posts (9), so that horizontal copper wire windings are formed at both ends of the copper wire, and the lower end of the connecting terminal (5) is respectively provided with a bending clamping portion (11) that is clamped and matched with the two copper wire windings, and the two bending clamping portions (11) are respectively clamped and connected to the outside of the copper wire winding.

2. The solenoid valve applied to the air spring according to claim 1, characterized in that: Each group of winding poles (9) comprises two poles, a notch (12) is left between the two poles, and the two ends of the copper wire (8) are respectively horizontally wound onto the two groups of corresponding poles to form a horizontal copper wire winding in the notch (12), and the bending clamping portion (11) is connected and fixed to the copper wire winding by resistance welding.

3. The solenoid valve applied to the 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 pole (9), the lower end of the wiring terminal (5) is inserted and positioned in the positioning slot (10), and a barb structure is provided at the lower end of the wiring terminal (5).

4. The solenoid valve applied to the air spring according to claim 3, characterized in that: The bottom of the coil frame (7) is formed with a plurality of outwardly protruding pre-tightening bosses (16).

5. The solenoid valve applied to the air spring according to claim 1, characterized in that: The bottom of the coil frame (7) is also formed with at least one positioning pin (17) in a protruding manner, and a positioning hole for the positioning pin (17) to be inserted and matched is provided on the end surface of the magnetic conductive tube (21) that abuts against the coil frame (7).

6. The solenoid valve applied to an air spring according to any one of claims 1 to 5, characterized in that: The lower end of the connector (2) extends axially downward to approach 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), and the upper end of the wiring terminal (5) is located in the interface (6).

7. The solenoid valve applied to an air spring according to any one of claims 1 to 5, characterized in that: A magnetic conductive cover plate (14) is provided between the top wall of the coil assembly and the connector (2); a plurality of circumferentially distributed positioning grooves (19) are provided on the outwardly protruding lower end of the magnetic conductive cover plate (14); and a plurality of positioning protrusions (18) are provided on the lower end of the connector (2) and are respectively inserted into and matched with the positioning grooves (19).

8. The solenoid valve applied to the air spring according to claim 7, characterized in that: A guide sleeve (13) with its opening facing downward is installed in the inner hole of the coil assembly, 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), 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.

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