Electromagnetic valve for controlling rigidity of air spring

Abstract

The utility model provides an air spring stiffness control solenoid valve, which relates to the technical field of air spring stiffness control solenoid valves, and comprises a shell, a coil assembly and a valve seat, an armature is slidably assembled in the coil assembly, the lower end of the armature is connected with a connecting rod, and the valve seat is provided with a valve cavity and a valve port communicated with the valve cavity. The lower end of the connecting rod is connected with a piston body used for opening and closing the valve port, a dynamic seal is arranged between the radial periphery of the piston body and the inner wall of the valve cavity, the lower end of the piston body is connected with a sealing body used for sealing the valve port, and a plurality of limiting protruding blocks distributed in the circumferential direction are arranged on the upper end face of the sealing body in an outwards-protruding mode. The valve seat is further provided with a limiting step, and when the piston body moves upwards to the limiting position, the upper end faces of the multiple limiting protruding blocks abut against the lower end face of the limiting step. According to the air spring rigidity control electromagnetic valve, through process improvement, the structures of the buffering cushion and the sealing main body are optimized, and manufacturing and mounting are convenient.

Description

Technical Field

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

[0002] At present, air spring stiffness control solenoid valves are often used in automobile air springs. By controlling the electrical signal to be converted into mechanical action, the valve is controlled to be on and off, 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 air spring stiffness control solenoid valve involved in this application is the pneumatic solenoid switch valve that controls the on and off of the air chamber mentioned above.

[0004] In the prior art air spring stiffness control solenoid valve structure, a corresponding sealing body is connected to the lower end face of the piston, and the lower end face of the sealing body forms a sealing plane for sealing the valve port. In addition, in order to buffer the impact force at the end of the piston reset return stroke and limit the reset limit stroke of the piston, it is usually necessary to connect a corresponding buffer pad to the top of the piston or the top wall of the valve cavity. Since the buffer pad and the sealing body are two separate parts, they need to be separately molded and manufactured before installation, which is not very convenient in both manufacturing and installation. Utility Model Content

[0005] In order to overcome at least one of the defects in the above prior art, the utility model provides an air spring stiffness control solenoid valve, which optimizes the buffer pad and the sealing body structure through process improvement to facilitate manufacturing and installation.

[0006] The utility model provides an air spring stiffness control solenoid valve: comprising a shell, a coil assembly and a valve seat, the shell is sleeved on the outside of the coil assembly, and the lower end of the shell is used for connecting and fixing the valve seat, the coil assembly is slidably equipped with an armature, the lower end of the armature is connected to a connecting rod, the valve seat is provided with a valve cavity and a valve port connected thereto, the lower end of the connecting rod is connected to a piston body for opening and closing the valve port, a dynamic seal is arranged between the radial outer periphery of the piston body and the inner wall of the valve cavity, the lower end of the piston body is connected to a sealing body for sealing the valve port, the upper end surface of the sealing body is convexly provided with a plurality of limiting protrusions distributed along the circumferential direction, a limiting step is also arranged on the valve seat, when the piston body moves upward to the limit position, the upper end surfaces of the plurality of limiting protrusions abut against the lower end surface of the limiting step.

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

[0008] In the air spring stiffness control solenoid valve structure of the utility model, the buffer component and the sealing body are effectively integrated, that is, the sealing body for sealing the valve port is connected to the lower end of the piston body, and a plurality of limit protrusions are arranged at the upper end of the sealing body. By utilizing the limit steps on the valve seat, when the piston body returns to the limit position, before its top reaches the top of the valve cavity, the plurality of limit protrusions first abut against the limit steps, thereby buffering the impact force at the end of the return stroke of the piston body and cutting off the piston body from resetting to the limit position, thereby avoiding rigid contact between the top of the piston body and the top wall of the valve cavity. In addition, compared with the traditional air spring stiffness control solenoid valve, this structure reduces the number of parts and the assembly process, thereby facilitating production and installation.

[0009] As an improvement, the limiting protrusion and the sealing body are an integrated structure and are connected to the lower end of the piston body through a vulcanization coating process.

[0010] As a further improvement, the piston body is integrally overmolded on the lower end of the connecting rod, or is connected to the lower end of the connecting rod by press-fitting.

[0011] Further improved, the valve seat includes an axially connected magnetic conductive tube and a base, the lower end of the magnetic conductive tube is provided with an inwardly concave upper cavity; the middle part of the upper end of the base is concave to form a lower concave cavity, the lower concave cavity and the upper concave cavity combine to form the valve cavity, and the lower end surface of the magnetic conductive tube and the inner wall of the lower concave cavity form the limiting step.

[0012] As a preferred structure, the dynamic seal includes a sealing ring and a guide ring, and the sealing ring and the guide ring are axially spaced and sealed between the radial outer wall of the piston body and the radial inner wall of the valve chamber; the sealing ring is a special-shaped sealing ring or a star-shaped sealing ring.

[0013] Furthermore, two first lip edges are provided on the radial inner side of the special-shaped sealing ring, and two second lip edges are provided on the radial outer side of the special-shaped sealing ring. The two first lip edges and each adjacent first lip edge and second lip edge are transitioned by a concave arc surface, and the two second lip edges are transitioned by a V-shaped groove, so that the protruding length of the two second lip edges is greater than the protruding length of the two first lips.

[0014] As another preferred structure, the dynamic seal includes a sealing ring and an auxiliary sealing ring, and the sealing ring and the auxiliary sealing ring are arranged tightly in 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.

[0015] As a further improvement, an arc-shaped groove is provided in the middle of the radial inner wall of the guide ring.

[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 air spring stiffness control solenoid valve of the utility model;

[0018] Figure 2 It is a partial schematic diagram of the dynamic seal and the sealing main body structure in the first embodiment of the utility model;

[0019] Figure 3 It is a partial schematic diagram of the dynamic seal and the sealing main body structure in the second embodiment of the utility model;

[0020] Figure 4 It is a cross-sectional front view of the special-shaped sealing ring in the utility model.

[0021] Description of reference numerals:

[0022] 1. Shell; 2. Coil assembly; 3. Armature; 4. Connecting rod; 5. Piston body; 6. Sealing body; 7. Limiting protrusion; 8. Limiting step; 9. Magnetic tube; 10. Base; 11. Upper concave cavity; 12. Lower concave cavity; 13. Sealing ring; 14. Guide ring; 15. First lip edge; 16. Second lip edge; 17. Auxiliary sealing ring. DETAILED DESCRIPTION

[0023] 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.

[0024] 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.

[0025] The present application is further described in detail below with reference to the accompanying drawings and specific embodiments.

[0026] Embodiment 1:

[0027] See also Figure 1-2 As shown, an embodiment of the present application discloses an air spring stiffness control solenoid valve, comprising a housing 1, a coil assembly 2 and a valve seat, wherein the housing 1 is sleeved on the outside of the coil assembly 2, and the lower end thereof is connected to the valve seat by bending and fixing.

[0028] In addition, an armature 3 is axially slidably installed in the coil assembly 2, and the lower end of the armature 3 is connected to a connecting rod 4. A valve cavity and a valve port connected thereto are opened on the valve seat, and the lower end of the connecting rod 4 is connected to a piston body 5 for opening and closing the valve port, and the lower end of the piston body 5 is connected to a sealing body 6 for sealing the valve port. The upper end surface of the sealing body 6 is convexly provided with a plurality of circumferentially distributed limiting protrusions 7, and a limiting step 8 is also provided on the valve seat. When the piston body 5 moves upward to the limit position, the upper end surfaces of the plurality of limiting protrusions 7 abut against the lower end surface of the limiting step 8, thereby buffering the impact force at the end of the piston return stroke and cutting off the piston return motion.

[0029] In the above structure, the valve seat includes an axially connected magnetic tube 9 and a base 10, and the lower end of the magnetic tube 9 is provided with an inwardly concave upper cavity 11; the middle part of the upper end of the base 10 is concave to form a lower concave cavity 12, and the lower concave cavity 12 and the upper concave cavity 11 form a valve cavity, and the lower end surface of the magnetic tube 9 and the inner wall of the lower concave cavity 12 form a limiting step 8.

[0030] In this embodiment, preferably, the limiting protrusion 7 and the sealing body 6 are an integrated structure, and the two are connected to the lower end of the piston body 5 through a vulcanization rubber coating process. In order to improve the structural strength of the rubber coating connection part, a corresponding groove structure is provided on the lower end surface of the piston body 5, so that after the rubber coating is completed, the colloid can be embedded in the groove on the lower end surface of the piston body 5.

[0031] Of course, in some other embodiments, the sealing body 6 can also be fixed to the lower end of the piston body 5 by other connection forms, such as bonding with strong glue, or connecting with other fasteners.

[0032] In addition, the piston body 5 in this embodiment is preferably made of plastic material, and the piston body 5 is integrally molded on the lower end of the connecting rod 4. The integral molding process is easy to process and has high connection strength.

[0033] In some other embodiments, the piston body 5 may also be a metal part, and the metal piston body 5 needs to be connected to the lower end of the connecting rod 4 by means of interference fit. Compared with the one-piece overmolding process, this method has an additional press-fitting process, and the press-fitting process will also produce press-fitting debris, which will cause pollution.

[0034] On the other hand, a dynamic seal is provided between the radial outer periphery of the piston body 5 and the inner wall of the valve cavity. In this embodiment, the dynamic seal includes a sealing ring 13 and a guide ring 14, and the sealing ring 13 and the guide ring 14 are spaced apart in the axial direction and slidably provided between the radial outer wall of the piston body 5 and the radial inner wall of the valve cavity. For details, see the attached Figure 2 Two axially spaced sealing grooves are provided on the outer peripheral wall of the piston body 5, and the sealing ring 13 and the guide ring 14 are respectively fitted in the upper and lower sealing grooves along the upper and lower positions, and the sealing ring 13 here is preferably a specially designed special-shaped sealing ring, and can also be replaced by a star-shaped special-shaped sealing ring; the guide ring 14 is made of PTFE material, and for the convenience of installation, an inclined opening is provided in the middle of the guide ring 14, and the opening is axially penetrated by the guide ring 14. In this structure, the guide ring 14 mainly plays a guiding and supporting role.

[0035] In addition, the special-shaped sealing ring refers to the cross section of the sealing ring 13 being an unconventional special-shaped structure, see the attached Figure 4 , two first lips 15 are arranged on the radial inner side of the special-shaped sealing ring, and two second lips 16 are arranged on the radial outer side of the special-shaped sealing ring. The two first lips 15 and the adjacent first lips 15 and second lips 16 are transitioned by an inwardly concave arc surface, and the two second lips 16 are transitioned by a V-shaped groove, so that the outward protrusion length of the two second lips 16 is greater than the outward protrusion length of the two first lips 15. Specifically, the 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 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 angle cavity, and the longer sealing lip has more wear margin than the structure of the conventional star-shaped sealing ring; and this structure has a small relative contact area during dynamic sealing, thereby reducing friction resistance and ensuring a better dynamic response speed, so that the dynamic seal can ensure a balance between durability and fast response performance.

[0036] Embodiment 2:

[0037] See attached Figure 3The 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 13 and an auxiliary sealing ring 17. The sealing ring 13 and the auxiliary sealing ring 17 are arranged radially and tightly to seal between the radial outer wall of the piston body 5 and the radial inner wall of the valve cavity, and the auxiliary sealing ring 17 is located at the radial outer end of the sealing ring. In this structure, the auxiliary sealing ring 17 needs to play a sealing role, and also play a role in reducing friction resistance and improving response speed. The auxiliary sealing ring 17 here is a sealing ring with FTFE material added, and it is a complete annular structure. The FTFE material has a low friction coefficient and strong wear resistance. In addition, the main material is still rubber material, that is, the auxiliary sealing ring 17 has a certain elastic deformation performance, which is convenient for it to be installed in the sealing groove.

[0038] Specifically, a sealing groove is opened on the outer wall of the piston body 5, the sealing ring 13 is arranged on the radial inner side, the auxiliary sealing ring 17 is arranged on the radial outer side, and the inner wall of the sealing ring 13 is sealed with the radial inner wall of the sealing groove, the outer wall of the sealing ring 13 is sealed with the inner wall of the auxiliary sealing ring 17, and the outer wall of the auxiliary sealing ring 17 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 17 is in contact with the sealing ring 13, so as to better ensure that the sealing ring 13 is stabilized in the center position in the axial direction and ensure stable sealing performance.

[0039] 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.

[0040] 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. An air spring stiffness control solenoid valve, comprising a housing (1), a coil assembly (2) and a valve seat, wherein the housing (1) is sleeved outside the coil assembly (2), and the lower end of the housing (1) is used for connecting and fixing the valve seat, an armature (3) is slidably mounted inside the coil assembly (2), the lower end of the armature (3) is connected to a connecting rod (4), the valve seat is provided with a valve cavity and a valve port connected thereto, the lower end of the connecting rod (4) is connected to a piston body (5) for opening and closing the valve port, and the characteristics are: A dynamic seal is provided between the radial outer periphery of the piston body (5) and the inner wall of the valve cavity. The lower end of the piston body (5) is connected to a sealing body (6) for sealing the valve port. The upper end surface of the sealing body (6) is convexly provided with a plurality of circumferentially distributed limiting protrusions (7). A limiting step (8) is also provided on the valve seat. When the piston body (5) moves upward to the limit position, the upper end surfaces of the plurality of limiting protrusions (7) abut against the lower end surface of the limiting step (8).

2. The air spring stiffness control solenoid valve according to claim 1, characterized in that: The limiting protrusion (7) and the sealing body (6) are an integrated structure and are connected to the lower end of the piston body (5) through a vulcanization coating process.

3. The air spring stiffness control solenoid valve according to claim 1 or 2, characterized in that: The piston body (5) is integrally overmolded on the lower end of the connecting rod (4), or is connected to the lower end of the connecting rod (4) in a press-fit manner.

4. The air spring stiffness control solenoid valve according to claim 1 or 2, characterized in that: The valve seat comprises an axially connected magnetic conductive tube (9) and a base (10); the lower end of the magnetic conductive tube (9) is provided with an inwardly concave upper cavity (11); the middle part of the upper end of the base (10) is inwardly concave to form a lower cavity (12); the lower cavity (12) and the upper cavity (11) are combined to form the valve cavity; the lower end surface of the magnetic conductive tube (9) and the inner wall of the lower cavity (12) form the limiting step (8).

5. The air spring stiffness control solenoid valve according to claim 1, characterized in that: The dynamic seal comprises a sealing ring (13) and a guide ring (14), wherein the sealing ring (13) and the guide ring (14) are arranged in an axially spaced manner to seal between the radial outer wall of the piston body (5) and the radial inner wall of the valve cavity; the sealing ring (13) is a special-shaped sealing ring or a star-shaped sealing ring.

6. The air spring stiffness control solenoid valve according to claim 5, characterized in that: Two first lip edges (15) are arranged on the radial inner side of the special-shaped sealing ring, and two second lip edges (16) are arranged on the radial outer side of the special-shaped sealing ring. The two first lip edges (15) and each adjacent first lip edge (15) and second lip edge (16) are transitioned through an inwardly concave arc surface, and the two second lip edges (16) are transitioned through a V-shaped groove, so that the outward protrusion length of the two second lip edges (16) is greater than the outward protrusion length of the two first lip edges (15).

7. The air spring stiffness control solenoid valve according to claim 1, characterized in that: The dynamic seal comprises a sealing ring (13) and an auxiliary sealing ring (17), wherein the sealing ring (13) and the auxiliary sealing ring (17) are arranged closely in the radial direction and seal between the radial outer wall of the piston body (5) and the radial inner wall of the valve cavity, and the auxiliary sealing ring (17) is located at the radial outer end of the sealing ring.

8. The air spring stiffness control solenoid valve according to claim 7, characterized in that: An arc-shaped groove is provided in the middle of the radial inner wall of the auxiliary sealing ring (17).

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