stiffness valve

Abstract

The utility model belongs to solenoid valve technical field, specifically provides a rigidity valve. The utility model aims at solving the problem that the convex on the valve core of existing rigidity valve can easily lead to the radial deviation of valve core. The rigidity valve of the utility model includes valve body and valve core, and the valve body is limited to have the gas inlet and the gas outlet, and the valve core is slidably arranged in the valve body and includes base body and elastic component. The base body is provided with annular shoulder near the axial end of gas inlet. The elastic component includes sealing structure and shock absorbing ring, the sealing structure is arranged on one side of annular shoulder axially, and is used for blocking the communication between gas inlet and gas outlet when the rigidity valve is closed. The shock absorbing ring is arranged on the other side of annular shoulder axially, and the end of shock absorbing ring away from annular shoulder is annular surface, so that shock absorbing ring is abutted with valve body through annular surface when the rigidity valve is opened, thereby reducing the impact of valve core on valve body. The utility model overcomes the above technical problems.

Description

Technical Field

[0001] This utility model belongs to the field of electromagnetic valve technology, and specifically provides a stiffness valve. Background Technology

[0002] The stiffness valve is a core component in automotive air suspension systems and other fields. It controls the opening and closing of the air inlet and outlet by the axial sliding of the valve core within the valve body, thereby adjusting the working volume of the air spring and achieving stiffness conversion. This directly affects the smoothness of the vehicle's ride and the driving experience. During the opening of the stiffness valve, the valve core moves rapidly axially under the influence of fluid pressure and elastic force. Its end impacts the valve body, generating noise and causing wear on both the valve core and the valve body. Frequent and prolonged impacts reduce the valve's reliability and lifespan.

[0003] To address the aforementioned impact issues, existing technologies typically incorporate sealing and damping structures on the valve core. The sealing structure blocks the airflow while mitigating the impact of the valve core on the valve body. The damping structure, on the other hand, reduces the impact when the airflow is open. The damping structure generally employs a design with multiple circumferentially spaced damping protrusions. These protrusions contact the valve body to disperse the impact force, thus achieving a damping effect.

[0004] However, the spaced damping protrusions can easily lead to uneven force on the valve core, causing radial displacement of the valve core, affecting the fitting accuracy between the sealing structure and the valve body, and even causing air leakage or valve core jamming. Utility Model Content

[0005] One objective of this invention is to solve the problem that protrusions on the valve core of existing rigid valves can easily cause radial displacement of the valve core.

[0006] To achieve the above objectives, this utility model provides a stiffness valve, including a valve body and a valve core. The valve body defines an air inlet and an air outlet, and the valve core is slidably disposed within the valve body and includes: The base has an annular shoulder at its axial end near the air inlet; The elastic component includes a sealing structure and a damping ring. The sealing structure is disposed on one side of the annular shoulder along the axial direction and is used to block the communication between the air inlet and the air outlet when the stiffness valve is closed. The damping ring is disposed on the other side of the annular shoulder along the axial direction. The end of the damping ring away from the annular shoulder is an annular surface, so that the damping ring abuts against the valve body through the annular surface when the stiffness valve is open, thereby reducing the impact of the valve core on the valve body.

[0007] Optionally, the shock-absorbing ring is provided with multiple grooves to reduce the elastic coefficient of the shock-absorbing ring.

[0008] Optionally, the plurality of grooves includes at least one inner annular groove and at least one outer annular groove, the inner annular groove being disposed on the inner side of the shock-absorbing ring and the outer annular groove being disposed on the outer side of the shock-absorbing ring.

[0009] Optionally, the inner ring groove and the outer ring groove are staggered in the axial direction of the damping ring; and / or, the axial thickness of the inner ring groove and the outer ring groove is selected from any value from 0.5 mm to 3 mm.

[0010] Optionally, the elastic member further includes a wrapping structure disposed between the sealing structure and the damping ring, wherein the wrapping structure is connected to and integrally formed with the sealing structure and the damping ring respectively.

[0011] Optionally, the annular shoulder has a concave-convex structure on the side facing the air inlet, and the sealing structure has a concave-convex mating structure that mates with the concave-convex structure, and the concave-convex structure and the concave-convex mating structure are engaged together; and / or, the sealing structure is annular in its entirety.

[0012] Optionally, the valve body includes an electromagnetic coil, and the stiffness valve further includes an armature and a valve stem disposed in the valve body. The valve stem is fixedly connected to the armature and the base respectively. The electromagnetic coil is used to drive the armature to move so that the valve core blocks the communication between the air inlet and the air outlet.

[0013] Optionally, the valve body further includes a magnetic yoke and a return spring, the valve stem passing through the magnetic yoke so that the valve core and the armature are respectively located on both sides of the magnetic yoke; the return spring is disposed between the magnetic yoke and the armature to drive the valve core to open the stiffness valve.

[0014] Optionally, the base is provided with pressure equalization holes to balance the air pressure on both sides of the base along the axial direction; the valve core is also provided with a sliding sealing ring, which slides in contact with the magnetic yoke.

[0015] Optionally, the stiffness valve is suitable for adjusting the stiffness of the air spring.

[0016] Based on the foregoing description, those skilled in the art will understand that in the aforementioned technical solution of this utility model, by providing a damping ring on the side of the annular shoulder away from the sealing structure, and setting the end of the damping ring away from the annular shoulder as an annular surface, the damping ring can abut against the valve body through the annular surface when the stiffness valve is opened, thereby reducing the impact of the valve core on the valve body. Because the damping ring impacts the valve body through the annular surface, the impact force on the valve core is more uniform, effectively preventing radial displacement of the valve core.

[0017] Furthermore, by setting multiple grooves on the damping ring to reduce the elastic coefficient of the damping ring, those skilled in the art can adjust the elastic coefficient of the damping ring according to actual needs by adjusting the parameters and number of the grooves to adapt to different models of stiffness valves.

[0018] Furthermore, by setting an inner ring groove on the inner side of the damping ring and an outer ring groove on the outer side of the damping ring, the damping pad is prevented from tilting inward or outward due to setting ring grooves only on the inner or outer side of the damping pad.

[0019] Furthermore, by staggering the inner and outer ring grooves along the axial direction of the damping ring, the damping ring can undergo a "wave-like" elastic deformation upon impact, rather than compression or bending in a single direction. This deformation can more effectively absorb the kinetic energy of the valve core impact, reducing the peak impact force at the moment of impact. Compared to aligning the inner and outer ring grooves, the vibration damping and noise reduction effect is more significant, further reducing the operating noise of the stiffness valve.

[0020] Other beneficial effects of this utility model will be described in detail below with reference to the accompanying drawings, so that those skilled in the art can more clearly understand the improvement purpose, features and advantages of this utility model. Attached Figure Description

[0021] To more clearly illustrate the technical solution of this utility model, some embodiments of this utility model will be described below with reference to the accompanying drawings. Those skilled in the art should understand that the same reference numerals may indicate the same or similar components or parts in different drawings; the drawings of this utility model are not necessarily drawn to scale. In the drawings: Figure 1 This is a perspective view (first axonometric view) of the stiffness valve in some embodiments of this utility model. Figure 2 This is a perspective view (second axonometric view) of the stiffness valve in some embodiments of this utility model. Figure 3 yes Figure 1 and Figure 2 Radial view of a medium-stiffness valve; Figure 4 yes Figure 3 A cross-sectional view of a medium-stiffness valve along the AA direction (open state). Figure 5 yes Figure 3 Cross-sectional view of a medium-stiffness valve along the AA direction (closed state); Figure 6 yes Figure 4 and Figure 5 Exploded view of the middle valve core (first isometric view); Figure 7 yes Figure 4 and Figure 5Exploded view of the middle valve core (second isometric view); Figure 8 yes Figure 3 Cross-sectional view of the central valve core along the AA direction (exploded view). Figure 9 yes Figure 3 A cross-sectional view of the valve core along the AA direction.

[0022] Explanation of reference numerals in the attached figures: 001. Stiffness valve; 100. Valve body; 101. Air inlet; 102. Air outlet; 110. Solenoid coil; 120. Magnetic yoke; 131. Valve seat; 132. Valve cover; 140. Housing; 150. Power plug; 160. Valve sleeve; 170. Install sealing ring; 200. Valve core; 210. Base body; 2101. Pressure equalizing hole; 211. Annular shoulder; 212. Concave-convex structure; 220. Elastic component; 221. Sealing structure; 2211. Concave-convex mating structure; 222. Shock-absorbing ring; 2220. Groove; 2221. Inner annular groove; 2222. Outer annular groove; 223. Wrapping structure; 230. Sliding sealing ring; 310. Armature; 320. Valve stem; 400. Return spring. Detailed Implementation

[0023] Those skilled in the art should understand that the embodiments described below are merely some embodiments of the present invention, and not all embodiments of the present invention. These embodiments are intended to explain the technical principles of the present invention and are not intended to limit the scope of protection of the present invention. Based on the embodiments provided by the present invention, all other embodiments obtained by those skilled in the art without creative effort should still fall within the scope of protection of the present invention.

[0024] It should be noted that in the description of this utility model, terms such as "center," "upper," "lower," "top," "bottom," "left," "right," "vertical," "horizontal," "inner," and "outer," which indicate direction or positional relationships, are based on the direction or positional relationships shown in the accompanying drawings. These are used merely for ease of description and do not indicate or imply that the corresponding device or element must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0025] Furthermore, it should be noted that, in the description of this utility model, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to fixed connections, detachable connections, or integral connections; they can refer to mechanical connections or electrical connections; they can refer to direct connections or indirect connections through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances. For example, unless otherwise specified, the terms "installation," "connection," "joining," and "fixing" can specifically refer to any feasible connection form such as bolt connection, screw connection, welding, insertion, riveting, fusion welding, or snap-fit.

[0026] Furthermore, it should be noted that in the description of this utility model, mm represents millimeter, cm represents centimeter, and m represents meter.

[0027] like Figures 1 to 5 As shown, in some embodiments of this utility model, the stiffness valve 001 includes a valve body 100, a valve core 200, an armature 310, a valve stem 320, and a return spring 400.

[0028] The valve body 100 has an air inlet 101 and an air outlet 102. The air inlet 101 is used to connect to the upstream air path of the stiffness valve 001, and the air outlet 102 is used to connect to the downstream air path of the stiffness valve 001.

[0029] The valve core 200, armature 310, and valve stem 320 are all located inside the valve body 100 and fixedly connected. Under the action of the electromagnetic coil 110 in the valve body 100, the armature 310 can drive the valve core 200 to move, thereby closing the air inlet 101 and blocking the connection between the air inlet 101 and the air outlet 102.

[0030] In addition, in other embodiments of this utility model, those skilled in the art may omit the armature 310 and valve stem 320 as needed, and allow the magnetic force generated by the electromagnetic coil 110 of the valve body 100 to act directly on the valve core 200, thereby driving the valve core 200 to move.

[0031] The return spring 400 is disposed between the armature 310 and the valve body 100, and is used to drive the valve core 200 to move, thereby opening the air inlet 101 and connecting the air inlet 101 with the air outlet 102. Alternatively, those skilled in the art may, as needed, place the return spring 400 between the valve core 200 and the valve body 100, that is, make both ends of the return spring 400 abut against the valve core 200 and the valve body 100 respectively.

[0032] In other embodiments of this utility model, those skilled in the art can also, as needed, open the air inlet 101 under the action of the electromagnetic coil 110, so that the air inlet 101 and the air outlet 102 are connected; and close the air inlet 101 under the action of the return spring 400, thereby blocking the connection between the air inlet 101 and the air outlet 102.

[0033] In addition, in other embodiments of this utility model, those skilled in the art may omit the reset spring 400 as needed, and make the electromagnetic coil 110 of the valve body 100 drive the valve core 200 to block and open the air passage between the air inlet 101 and the air outlet 102, so that the air inlet 101 and the air outlet 102 are disconnected and connected.

[0034] like Figure 4 and Figure 5 As shown, in some embodiments of this utility model, the valve body 100 includes an electromagnetic coil 110, a magnetic yoke 120, a valve seat 131, a valve cover 132, a housing 140, a power plug 150, a valve sleeve 160, and a mounting sealing ring 170, etc.

[0035] The electromagnetic coil 110 provides electromagnetic force to the armature 310, driving the valve core 200 to move. The magnetic yoke 120 confines the magnetic field generated by the electromagnetic coil 110 to improve its efficiency. The valve seat 131 and valve cover 132 are located at opposite ends of the housing 140 along the axial direction (o), and are fixedly connected to the housing 140 to encapsulate and protect components such as the electromagnetic coil 110, magnetic yoke 120, and valve sleeve 160. The power plug 150 is installed on the valve cover 132 and electrically connected to the electromagnetic coil 110 to provide power. The valve sleeve 160 accommodates the armature 310 and guides the axial movement of the valve core 200 and the armature 310. The sealing ring 170 is used to seal the valve body 100 with the mounting object (e.g., a metal block or pipe with a insertion hole) to prevent high-pressure gas leakage.

[0036] like Figure 4 and Figure 5 As shown, with the valve body 100 assembled, the valve seat 131 and valve cover 132 are fixedly mounted to both ends of the housing 140 along the axial direction o. This fixed connection can be an interference fit, a threaded connection, welding, or it can be connected by other parts, such as by a snap ring. The solenoid coil 110 is disposed inside the housing 140, the magnetic yoke 120 is disposed between the valve seat 131 and the solenoid coil 110, the power plug 150 is installed at the valve cover 132, and the valve sleeve 160 is disposed inside the solenoid coil 110. Sealing rings 170 are respectively provided on the outer sides of the valve seat 131 and the housing 140.

[0037] Continue reading Figure 4 and Figure 5 With the valve body 100 assembled, the valve stem 320 passes through the magnetic yoke 120 so that the valve core 200 and the armature 310 are located on opposite sides of the magnetic yoke 120. A return spring 400 is disposed between the magnetic yoke 120 and the armature 310 to drive the valve core 200 to open the stiffness valve 001.

[0038] from Figure 4 and Figure 5 As can be seen from the figure, in some embodiments of this utility model, the air inlet 101 is formed at the axial end of the valve seat 131 away from the magnetic yoke 120, and the air outlet 102 is formed on the circumferential sidewall of the valve seat 131. The valve seat 131 has an inwardly protruding annular structure (not marked in the figure) between the air inlet 101 and the air outlet 102, and a conical ring is provided on the side of this annular structure near the magnetic yoke 120. This conical ring abuts against the valve core 200, thus sealing the air inlet 101.

[0039] It should be noted that in actual use, the air inlet 101 can also be used as the air outlet 102, and the air outlet 102 can be used as the air inlet 101.

[0040] Furthermore, in other embodiments of this utility model, those skilled in the art may omit at least one of the following components: magnetic yoke 120, valve seat 131, valve cover 132, housing 140, power plug 150, valve sleeve 160, and mounting sealing ring 170, as needed. For example, the valve sleeve 160 may be omitted.

[0041] like Figures 4 to 9 As shown, in some embodiments of this utility model, the valve core 200 is slidably disposed within the valve body 100 and includes a base 210 and an elastic member 220.

[0042] Among them, the axial end of the base 210 near the air inlet 101 is provided with an annular shoulder 211.

[0043] The elastic member 220 includes a sealing structure 221 and a damping ring 222. The sealing structure 221 is located on one side of the annular shoulder 211 along the axial direction and is used to block the communication between the air inlet 101 and the air outlet 102 when the stiffness valve 001 is closed. The damping ring 222 is located on the other side of the annular shoulder 211 along the axial direction. The end of the damping ring 222 away from the annular shoulder 211 is an annular surface, so that when the stiffness valve 001 is open, the damping ring 222 abuts against the magnetic yoke 120 of the valve body 100 through the annular surface, thereby reducing the impact of the valve core 200 on the valve body 100.

[0044] Those skilled in the art will understand that by providing a damping ring 222 on the side of the annular shoulder 211 away from the sealing structure 221, and setting the end of the damping ring 222 away from the annular shoulder 211 as an annular surface, the damping ring 222 can abut against the magnetic yoke 120 of the valve body 100 through the annular surface when the stiffness valve 001 is opened, thereby reducing the impact of the valve core 200 on the valve body 100. Because the damping ring 222 impacts the valve body 100 through the annular surface, the impact force on the valve core 200 is more uniform, effectively preventing radial displacement of the valve core 200.

[0045] Continue reading Figures 4 to 9 In some embodiments of this utility model, the elastic member 220 may further include a wrapping structure 223 disposed between the sealing structure 221 and the shock-absorbing ring 222, wherein the wrapping structure 223 is connected to the sealing structure 221 and the shock-absorbing ring 222 respectively and is integrally formed.

[0046] from Figure 9 As can be seen, the wrapping structure 223 wraps around the annular shoulder 211, thereby causing the elastic member 220 to wrap around the two axial end faces and the circumferential surface of the annular shoulder 211, which in turn makes the connection between the elastic member 220 and the annular shoulder 211 more reliable and firm.

[0047] In some embodiments of this utility model, the elastic member 220 may be integrally injection molded from rubber material.

[0048] Of course, those skilled in the art may omit the wrapping structure 223 as needed and set the sealing structure 221 and the shock-absorbing ring 222 as two independent components.

[0049] like Figure 8 and Figure 9 As shown, in some embodiments of this utility model, the shock-absorbing ring 222 is provided with a plurality of grooves 2220 to reduce the elastic coefficient of the shock-absorbing ring 222.

[0050] Those skilled in the art will understand that by providing multiple grooves 2220 on the damping ring 222 to reduce the elastic coefficient of the damping ring 222, those skilled in the art can adjust the elastic coefficient of the damping ring 222 according to actual needs by adjusting the parameters and number of the grooves 2220 to adapt to different models of stiffness valves 001.

[0051] Continue reading Figure 8 and Figure 9In some embodiments of this utility model, the plurality of grooves 2220 include at least one inner ring groove 2221 and at least one outer ring groove 2222. The inner ring groove 2221 is disposed on the inner side of the shock-absorbing ring 222, and the outer ring groove 2222 is disposed on the outer side of the shock-absorbing ring 222. This avoids the shock-absorbing pad tilting inward or outward due to the ring grooves being disposed only on the inner or outer side of the shock-absorbing pad.

[0052] Continue reading Figure 8 and Figure 9 In some embodiments of this utility model, the inner ring groove 2221 and the outer ring groove 2222 are interlaced in the axial direction o of the shock-absorbing ring 222, so that the shock-absorbing ring 222 forms a "wave-like" elastic deformation when impacted, rather than compression or bending in a single direction.

[0053] Those skilled in the art will understand that this deformation can more fully absorb the kinetic energy of the valve core 200 impact, reducing the peak impact force at the moment of impact. Compared to the alignment of the inner ring groove 2221 and the outer ring groove 2222, the vibration reduction and noise reduction effect is more significant, further reducing the operating noise of the stiffness valve 001.

[0054] like Figure 9 As shown, in some embodiments of this utility model, the axial thickness d of the inner ring groove 2221 and the outer ring groove 2222 is selected from any value from 0.5mm to 3mm, specifically any feasible value such as 0.5mm, 1mm, 1.5mm, 1.8mm, 2mm, 2.3mm, 2.7mm, 3mm, etc., to ensure that the shock-absorbing ring 222 can form a "wave-like" elastic deformation when it is impacted.

[0055] like Figure 4 and Figure 5 As shown, in some embodiments of this utility model, the substrate 210 has a hollow structure to reduce the mass of the substrate 210, thereby improving the response rate of the valve core 200.

[0056] like Figures 4 to 9 As shown, in some embodiments of this utility model, the sealing structure 221 is generally annular, so that the sealing structure 221 fits the annular shoulder 211 and avoids material waste.

[0057] Continue reading Figures 4 to 9 In some embodiments of this utility model, the annular shoulder 211 has a concave-convex structure 212 on the side facing the air inlet 101, and the sealing structure 221 has a concave-convex mating structure 2211 that mates with the concave-convex structure 212. The concave-convex structure 212 and the concave-convex mating structure 2211 are engaged together (e.g., Figure 9 (as shown), to enhance the connection strength between the sealing structure 221 and the annular shoulder 211.

[0058] The concave-convex structure 212 and the concave-convex mating structure 2211 may each include at least one of an annular groove and an annular protrusion.

[0059] like Figures 4 to 9 As shown, in some embodiments of this utility model, a sliding sealing ring 230 is also provided on the valve core 200, and the sliding sealing ring 230 slides in contact with the magnetic yoke 120.

[0060] Specifically, the outer peripheral surface of the substrate 210 is provided with an annular groove (not marked in the figure), and the sliding sealing ring 230 is embedded in the annular groove.

[0061] like Figure 6 , Figure 8 and Figure 9 As shown, in some embodiments of this utility model, the base 210 is provided with a pressure equalization hole 2101 to balance the air pressure on both sides of the base 210 in the axial direction, and to prevent the air pressure difference on both sides of the valve core 200 in the axial direction from being generated during the movement of the valve core 200, thus hindering the movement of the valve core 200.

[0062] The following reference Figure 4 and Figure 5 The working principle of the stiffness valve 001 in some embodiments of this utility model will be briefly explained.

[0063] like Figure 4 As shown, when the electromagnetic coil 110 is de-energized, under the action of the return spring 400, the armature 310 and the yoke 120 move away from each other, thereby causing the valve core 200 to open the air inlet 101, making the air inlet 101 and the air outlet 102 connected. In this state, gas can flow from the air inlet 101 to the air outlet 102.

[0064] When the electromagnetic coil 110 is energized, the magnetic field generated by the electromagnetic coil 110 acts on the armature 310 and the yoke 120, causing the armature 310 and the yoke 120 to attract each other. This magnetic force overcomes the elastic force of the return spring 400, driving the valve core 200 from... Figure 4 Move to the position shown Figure 5 The location shown.

[0065] like Figure 5As shown, when the electromagnetic coil 110 is energized, the valve core 200 abuts against the magnetic yoke 120 of the valve seat 131, sealing the air inlet 101. High-pressure gas in the upstream air path connected to the air inlet 101 flows to the top side of the valve core 200 through the pressure equalization hole 2101, thereby equalizing the air pressure on both sides of the valve core 200 along the axial direction (o), thus minimizing the pressure difference experienced by the valve core 200. Simultaneously, the high-pressure gas on the top side of the valve core 200 fills the entire interior of the valve body 100 through the gap between the valve stem 320 and the magnetic yoke 120, and through the armature 310 and the valve sleeve 160, minimizing the pressure difference experienced by the entire valve core 200 along the axial direction (o).

[0066] When the electromagnetic coil 110 is de-energized, the return spring 400 drives the valve core 200, armature 310, and valve stem 320 to move from... Figure 5 Move to the position shown Figure 4 The position shown. At the instant the valve core 200 disengages from the valve seat 131, the high-pressure air inside the valve body 100 is quickly released through the equalizing hole 2101, the gap between the valve stem 320 and the magnetic yoke 120, and the gap between the armature 310 and the valve sleeve 160, ensuring that the movement of the valve core 200 is not affected by the air pressure difference.

[0067] Furthermore, the stiffness valve 001 described in any of the preceding embodiments of this utility model can be used to adjust the stiffness of the air spring and can be installed in automobiles.

[0068] The technical solution of this utility model has been described in conjunction with several embodiments above. However, it will be readily understood by those skilled in the art that the protection scope of this utility model is not limited to these specific embodiments. Without departing from the technical principles of this utility model, those skilled in the art can disassemble and combine the technical solutions in the above embodiments, and can also make equivalent changes or substitutions to the relevant technical features. Any changes, equivalent substitutions, improvements, etc., made within the technical concept and / or technical principles of this utility model will fall within the protection scope of this utility model.

[0069] Finally, it should be noted that in this invention, the term "connection" refers to fluid communication, allowing fluids (e.g., air, liquid) to flow between two interconnected entities. Furthermore, this "connection" can be either a leak-free flow of fluid between two interconnected entities, or a flow with slight leakage of fluid between two interconnected entities.

Claims

1. A stiffness valve, characterized in that, The valve includes a valve body and a valve core, the valve body defining an air inlet and an air outlet, and the valve core being slidably disposed within the valve body and comprising: The base has an annular shoulder at its axial end near the air inlet; The elastic component includes a sealing structure and a damping ring. The sealing structure is disposed on one side of the annular shoulder along the axial direction and is used to block the communication between the air inlet and the air outlet when the stiffness valve is closed. The damping ring is disposed on the other side of the annular shoulder along the axial direction. The end of the damping ring away from the annular shoulder is an annular surface, so that the damping ring abuts against the valve body through the annular surface when the stiffness valve is open, thereby reducing the impact of the valve core on the valve body.

2. The stiffness valve according to claim 1, characterized in that, The shock-absorbing ring has multiple grooves to reduce its elastic coefficient.

3. The stiffness valve according to claim 2, characterized in that, The plurality of grooves includes at least one inner annular groove and at least one outer annular groove. The inner ring groove is located on the inner side of the shock-absorbing ring. The outer ring groove is located on the outside of the shock-absorbing ring.

4. The stiffness valve according to claim 3, characterized in that, The inner ring groove and the outer ring groove are staggered in the axial direction of the damping ring; and / or, The axial thickness of the inner and outer annular grooves is selected from any value between 0.5 mm and 3 mm.

5. The stiffness valve according to any one of claims 1 to 4, characterized in that, The elastic member further includes a wrapping structure disposed between the sealing structure and the damping ring, wherein the wrapping structure is connected to the sealing structure and the damping ring respectively and is integrally formed.

6. The stiffness valve according to any one of claims 1 to 4, characterized in that, The annular shoulder has a concave-convex structure on the side facing the air inlet, and the sealing structure has a concave-convex mating structure that mates with the concave-convex structure, the concave-convex structure and the concave-convex mating structure engaging together; and / or, The sealing structure is generally annular.

7. The stiffness valve according to any one of claims 1 to 4, characterized in that, The valve body includes an electromagnetic coil. The stiffness valve also includes an armature and a valve stem disposed in the valve body. The valve stem is fixedly connected to the armature and the base respectively. The electromagnetic coil is used to drive the armature to move so that the valve core blocks the communication between the air inlet and the air outlet.

8. The stiffness valve according to claim 7, characterized in that, The valve body also includes a magnetic yoke and a return spring. The valve stem passes through the magnetic yoke so that the valve core and the armature are located on opposite sides of the magnetic yoke, respectively. The reset spring is disposed between the magnetic yoke and the armature to drive the valve core to open the stiffness valve.

9. The stiffness valve according to claim 8, characterized in that, The substrate is provided with pressure equalization holes to balance the air pressure on both sides of the substrate along the axial direction; The valve core is also provided with a sliding sealing ring, which slides in contact with the magnetic yoke.

10. The stiffness valve according to any one of claims 1 to 4, characterized in that, The stiffness valve is used to adjust the stiffness of an air spring.

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