Air suspension stiffness valve
By placing a gasket between the guide sleeve and the moving iron core, the wear and noise problems between the guide sleeve and the moving iron core are solved, extending the service life of the stiffness valve and improving the smoothness of movement.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- LAO SHIBAOSHI ELECTROMAGNETIC TECHNOLOGY (JIANGSU) CO LTD
- Filing Date
- 2025-09-29
- Publication Date
- 2026-07-28
AI Technical Summary
Wear and noise issues between the guide sleeve and the moving iron core become more pronounced after long-term use, leading to a shortened service life of the stiffness valve.
A gasket is placed between the guide sleeve and the moving iron core. The gasket has a connecting part and an extension part to reduce direct contact wear and maintain spatial communication to balance pressure and buffer impact when the moving iron core moves.
It reduces noise, extends the service life of the stiffness valve, and improves the smoothness and stability of the moving iron core's movement within the guide sleeve.
Smart Images
Figure CN224566603U_ABST
Abstract
Description
Technical Field
[0001] This application belongs to the field of air suspension technology, and particularly relates to an air suspension stiffness valve. Background Technology
[0002] Automotive multi-chamber air springs have a main chamber and a secondary chamber. The airflow into each chamber is regulated by a stiffness valve to achieve the desired stiffness and height of the air spring.
[0003] When the coil assembly of the stiffness valve is energized, it generates a magnetic field that drives the moving iron core to move up and down inside the guide sleeve. The moving iron core drives the plunger to move up and down through the valve stem to control the opening and closing of the gas passage.
[0004] The moving iron core and the guide sleeve have a clearance fit, which may cause some friction and impact with the inner wall of the guide sleeve during movement, generating noise. As the stiffness valve ages, the moving iron core experiences some wear, the clearance between the guide sleeve and the moving iron core becomes larger, and the noise generated by friction and impact becomes more obvious. Utility Model Content
[0005] To address the technical problem of noise generated between the guide sleeve and the moving iron core in existing technologies, this application provides an air suspension stiffness valve.
[0006] To solve the above-mentioned technical problems, the technical solution adopted by this utility model is an air suspension stiffness valve, including a guide sleeve, a fixed seat and a moving iron core. One end of the guide sleeve is fixedly connected to the fixed seat, and the moving iron core is slidably disposed in the guide sleeve, dividing the inner cavity of the guide sleeve into a first space and a second space.
[0007] A gasket is provided in the gap between the guide sleeve and the moving iron core. The gasket has a connecting portion that connects the first space and the second space. The gasket also has an extension portion that extends to the space between the fixed seat and the moving iron core.
[0008] In some embodiments, the axial length of the liner is greater than the height of the moving iron core, the circumferential length of the liner is less than the circumference of the moving iron core, and the gap between the two ends of the circumferential liner forms the connecting portion.
[0009] In some embodiments, the gasket is adhered and fixed to the inner wall of the guide sleeve.
[0010] In some embodiments, the fixed base has a recessed groove at one end opposite to the moving iron core, and the moving iron core has a protruding end that matches the recessed groove at one end opposite to the fixed base, and the extension extends to the end face of the recessed groove.
[0011] In some embodiments, the number of extensions is three or more, and they are evenly distributed along the circumference of the fixing seat.
[0012] In some embodiments, the extension is adhered and fixed to the end face of the sink.
[0013] In some embodiments, the padding material is polytetrafluoroethylene fiberglass cloth.
[0014] In some embodiments, the bottom of the guide sleeve is fitted and fixed outside the fixed base, the end face of the sink is an arc surface, and the moving iron core is provided with an arc step structure that matches the arc surface.
[0015] In some embodiments, the gap between the guide sleeve and the moving iron core is 150-200 μm, and the thickness of the liner is 100-130 μm.
[0016] Beneficial effects: This application incorporates a gasket between the moving iron core and the guide sleeve to reduce wear between the stiffness valve and the guide sleeve, lower noise, and extend the service life of the stiffness valve. It also prevents premature wear of the moving iron core, which could cause it to deviate within the guide sleeve, resulting in more severe friction and noise. Furthermore, a connecting portion between the first and second spaces is provided on the gasket, ensuring that the first and second spaces remain connected during axial movement of the moving iron core within the guide sleeve. This prevents pressure differences and avoids excessive pressure on one side of the moving iron core, which could slow its movement and improve the smoothness of its movement within the guide sleeve. Attached Figure Description
[0017] Figure 1 A schematic diagram of the assembly structure of the stiffness valve guide sleeve, moving iron core and fixed seat;
[0018] Figure 2 This is a cross-sectional view of the assembly structure of the stiffness valve guide sleeve, moving iron core, bushing and fixed seat in one embodiment;
[0019] Figure 3 for Figure 2 Schematic diagram of the middle bushing structure;
[0020] Figure 4 This is a cross-sectional view of the assembly structure of the stiffness valve guide sleeve, moving iron core, bushing and fixed seat in another embodiment;
[0021] Figure 5 for Figure 4 Schematic diagram of the middle bushing structure;
[0022] In the figure: 1. Guide sleeve, 11. First space, 12. Second space, 2. Moving iron core, 21. Protruding end, 22. Step structure, 3. Gasket, 31. Extension, 32. Connecting part, 4. Fixed seat, 41. Sink, 42. End face. Detailed Implementation
[0023] The present application will be further described below with reference to specific embodiments. Obviously, the described embodiments are only a part of the embodiments of the present application, and not all of them. All other embodiments obtained by those skilled in the art based on the embodiments of the present application without making creative changes are within the protection scope of the present application.
[0024] The stiffness valve used in automotive air suspension is located between the main chamber and the auxiliary chamber within the air spring. It is primarily driven by electromagnetic induction and is a type of solenoid valve. Its main components and working principle are as follows: it includes an electromagnetic coil, a barrel-shaped guide sleeve 1 with one open end housed within the electromagnetic coil, a moving iron core 2 that moves within the guide sleeve 1 under the drive of the electromagnetic coil, and a fixed seat 4 fixed directly below the guide sleeve 1. A valve seat is located at the bottom of the fixed seat 4, and the valve seat has a channel connecting the main and auxiliary chambers. One end of the valve stem passes through the fixed seat 4 and is fixedly connected to the moving iron core 2, while the other end is fixedly connected to a plunger (e.g., ...). Figure 2 and Figure 4 As shown, the valve stem is assembled in the central opening of the moving iron core and the fixed seat. The movement of the moving iron core 2 drives the plunger to move, and the reciprocating movement of the plunger opens and closes the passage connecting the main and auxiliary chambers, thereby adjusting the stiffness of the air spring. The moving iron core 2 and the guide sleeve 1 are in a clearance fit. The guide sleeve 1 serves as a guide for the moving iron core 2. After long-term operation, wear of the moving iron core 2 can cause it to deviate within the guide sleeve 1, resulting in more noticeable friction and noise. This application mainly addresses the problems of easy wear and noise generated between the guide sleeve 1 and the moving iron core 2. A detailed explanation is provided below with reference to the accompanying drawings.
[0025] like Figure 1 , 2As shown in Figure 4, an air suspension stiffness valve includes a guide sleeve 1, a fixed seat 4, and a moving iron core 2. One end of the guide sleeve 1 is fixedly connected to the fixed seat 4. The moving iron core 2 is slidably disposed within the guide sleeve 1, dividing the inner cavity of the guide sleeve 1 into a first space 11 and a second space 12. A gasket 3 is also provided in the gap between the guide sleeve 1 and the moving iron core 2. The gasket 3 separates the guide sleeve and the moving iron core 2, preventing direct contact and wear, and improving the life of the stiffness valve. Specifically, the gap between the guide sleeve 1 and the moving iron core 2 is 150-200 μm, and the thickness of the gasket 3 is 100-130 μm. The gasket 3 also has a connecting portion 32, which connects the first space 11 and the second space 12. During the movement of the moving iron core 2, the connecting portion 32 effectively maintains the pressure balance of the two spaces, ensuring smooth movement of the moving iron core 2 within the guide sleeve 1. The pad 3 also has an extension 31 extending between the fixed seat 4 and the moving iron core 2. The extension 31 can buffer the impact between the moving iron core 2 and the fixed seat 4, which can not only reduce the wear of the moving iron core 2, but also reduce the noise generated by the impact. At the same time, the extension 31 also plays a foolproof role when the pad 3 is installed.
[0026] In some embodiments, the axial length of the liner 3 is greater than the height of the moving iron core 2, so that the liner 3 can always be positioned between the moving iron core 2 and the guide sleeve 1 during the movement of the moving iron core 2. Figure 2 and 4 As shown, in some preferred embodiments, the axial length of the gasket 3 is set to be consistent with the height of the internal space of the guide sleeve 1, that is, the upper end of the gasket 3 abuts against the top surface of the guide sleeve 1, and the lower end abuts against the fixed seat 4, which can prevent the gasket 3 from shifting during the movement of the moving iron core 2. Setting the circumferential length of the gasket 3 to be smaller than the circumference of the moving iron core 2 can, on the one hand, improve the dimensional tolerance of the gasket 3 without affecting its functional effect, and facilitate production and installation; on the other hand, as Figure 3 and 5 As shown, the gaps at both ends of the circumferential direction of the pad 3 form the connecting portion 32, without the need for additional structures to form the connecting portion 32.
[0027] To improve the installation stability of the gasket 3 and prevent it from moving inside the guide sleeve 1, in some embodiments, the gasket 3 is glued and fixed to the inner wall of the guide sleeve 1.
[0028] like Figure 2 and 4As shown, to improve the stability of the moving iron core 2's movement, in some embodiments, the fixed base 4 has a groove 41 at the end opposite to the moving iron core 2, and the moving iron core 2 has a protruding end 21 that matches the groove 41 at the end opposite to the fixed base 4. The extension 31 extends to the end face 42 of the groove 41. During movement, the protruding end 21 of the moving iron core 2 cooperates with the groove 41 of the fixed base 4, forming a guiding structure, which helps improve the stability of the moving iron core 2's operation. Extending the extension 31 to the end face 42 of the groove 41 acts as a buffer, preventing collisions between the steps of the moving iron core 2 and the steps of the fixed base 4, and reducing noise during the operation of the stiffness valve.
[0029] To avoid the moving iron core 2 from being axially deflected in the guide sleeve 1 due to the extension portion 3131, in some embodiments, the number of extension portions 31 is three or more, and they are evenly distributed around the fixed base 4. For example... Figure 3 and 5 As shown, in some embodiments, the number of extensions 31 is set to 6. To ensure the stability of the extensions 31, in some embodiments, the extensions 31 are glued and fixed to the end face 42 of the sink 41.
[0030] The gasket 3 is preferably made of a material that is resistant to high temperatures, wear-resistant, and has good lubricity. In some embodiments, the gasket 3 is made of polytetrafluoroethylene (PTFE) fiberglass cloth. PTFE fiberglass cloth has the characteristics of high temperature resistance and corrosion resistance, as well as a low coefficient of friction, good insulation performance, and can also prevent the generation of static electricity. To further prevent the edges of the PTFE fiberglass cloth from becoming loose, its edges can be sealed to form a sealed structure, such as by applying adhesive or heat sealing.
[0031] like Figure 3 As shown, since the extension 31 is bent relative to the main body of the pad 3, in order to reduce the impact of the bending on the extension 31, in some embodiments, the bottom of the guide sleeve 1 is fitted and fixed to the outside of the fixing seat 4, the end face 42 of the countersink 41 is an arc surface, and the moving iron core 2 is provided with an arc step structure 22 that matches the arc surface. Setting the end face 42 of the countersink 41 as an arc surface allows for a relatively smooth transition between the extension 31 of the pad 3 and the main body of the pad 3, avoiding the bending of the extension 31 from affecting the pad 3.
[0032] Of course, polytetrafluoroethylene fiberglass cloth, used as padding 3, has a certain degree of flexibility and toughness, such as... Figure 5 As shown, setting the end face 42 of the sink 41 as a plane, and bending the extension 31 of the pad 3 at a right angle relative to the main body of the pad 3 will not affect the performance of the pad 3.
[0033] While the disclosure is as stated above, its scope of protection is not limited thereto. Those skilled in the art can make various changes and modifications without departing from the spirit and scope of this disclosure, and all such changes and modifications will fall within the scope of protection of this application.
Claims
1. An air suspension stiffness valve, characterized in that, It includes a guide sleeve (1), a fixed seat (4) and a moving iron core (2). One end of the guide sleeve (1) is fixedly connected to the fixed seat (4). The moving iron core (2) is slidably disposed in the guide sleeve (1) and divides the inner cavity of the guide sleeve (1) into a first space (11) and a second space (12). A gasket (3) is provided in the gap between the guide sleeve (1) and the moving iron core (2). The gasket (3) has a connecting part (32) that connects the first space (11) and the second space (12). The gasket (3) also has an extension (31) that extends between the fixed seat (4) and the moving iron core (2).
2. The air suspension stiffness valve according to claim 1, characterized in that, The axial length of the pad (3) is greater than the height of the moving iron core (2), the circumferential length of the pad (3) is less than the circumference of the moving iron core (2), and the gap between the two ends of the pad (3) forms the connecting part (32).
3. The air suspension stiffness valve according to claim 1 or 2, characterized in that, The gasket (3) is pasted and fixed to the inner wall of the guide sleeve (1).
4. The air suspension stiffness valve according to claim 1 or 2, characterized in that, The fixed base (4) has a groove (41) at one end opposite to the moving iron core (2), and the moving iron core (2) has a protruding end (21) that matches the groove (41) at one end opposite to the fixed base (4). The extension (31) extends to the end face (42) of the groove (41).
5. The air suspension stiffness valve according to claim 4, characterized in that, The number of the extensions (31) is three or more, and they are evenly distributed around the fixed base (4).
6. The air suspension stiffness valve according to claim 4, characterized in that, The extension (31) is attached and fixed to the end face (42) of the sink (41).
7. The air suspension stiffness valve according to claim 1, characterized in that, The pad (3) is made of polytetrafluoroethylene glass fiber cloth.
8. The air suspension stiffness valve according to claim 4, characterized in that, The bottom of the guide sleeve (1) is fitted and fixed outside the fixed base (4), the end face (42) of the sink (41) is an arc surface, and the moving iron core (2) is provided with an arc step structure (22) that matches the arc surface.
9. The air suspension stiffness valve according to claim 1, characterized in that, The gap between the guide sleeve (1) and the moving iron core (2) is 150-200 μm, and the thickness of the liner (3) is 100-130 μm.