Non-magnetic-isolation-ring direct-proportion-control electric control suspension proportional pressure electromagnetic valve

Abstract

According to the direct proportion control electric control suspension proportional pressure electromagnetic valve without the magnetic isolation ring, magnetic circuit distribution is optimized through a groove and a spiral line structure arranged outside the stop iron, and the magnetic field utilization rate is increased; by adopting the thin film and the self-lubricating bearing, the friction force between kinematic pairs is effectively reduced, the clamping stagnation resistance is remarkably improved, and the service life is remarkably prolonged; through the arrangement of the first pressure guide hole and the second pressure guide hole, the front and back pressure of the armature is balanced, and the interference of hydraulic force on the movement of the valve element is avoided; due to the expansion flow design of the annular grooves and the damping holes, local pressure is reduced, the control stability is improved, the hydraulic feedback area is increased, and the control linearity and precision are enhanced. The integral structure is simple and reliable, complicated parts such as a magnetism isolating ring are not needed, the reliability and the process feasibility of products are greatly improved while high-performance proportional control is ensured, and the electronic control suspension system is suitable for a vehicle electronic control suspension system which has strict requirements on response speed, control precision and durability.

Description

Technical Field

[0001] This invention relates to the field of proportional solenoid valves for electronically controlled suspensions, and in particular to a proportional pressure solenoid valve for electronically controlled suspensions with direct proportional control without a magnetic isolation ring. Background Technology

[0002] The proportional pressure solenoid valve for electronically controlled suspension is a core actuator in modern vehicle active suspension systems. By receiving current signals from the vehicle's control unit, it rapidly adjusts the damping characteristics of the suspension system to adapt to different road conditions and driving needs, thereby improving vehicle handling, stability, and ride comfort. With the development of automotive intelligence and electrification, higher demands are placed on the response speed, control precision, linearity, and durability of solenoid valves. Currently, this type of solenoid valve is widely used in mid-to-high-end passenger cars, commercial vehicles, and special-purpose vehicles.

[0003] In existing technologies, electronically controlled proportional solenoid valves for suspension systems mostly employ platform or basin-type electromagnetic structures. These structures typically rely on the design of a magnetic circuit breaker, which involves placing an independent magnetically conductive mating component outside the moving iron and creating an air gap between them as magnetic resistance to guide the magnetic field to pass through the moving iron to the maximum extent, thereby generating sufficient electromagnetic force. While this structure can theoretically provide a large electromagnetic output, it has significant drawbacks in practical applications: First, because the moving iron is affected by the lateral magnetic attraction of the stationary iron during movement, insufficient coaxiality accuracy of the external mating component can easily lead to lateral swaying or even jamming of the moving iron, severely affecting the reliability of the solenoid valve. Second, this structure places extremely stringent requirements on the machining accuracy and assembly process of the components, increasing manufacturing costs and process complexity. Furthermore, traditional solenoid valves often use magnetic isolation rings to optimize the magnetic circuit, but this introduces additional parts and assembly steps, further affecting the product's reliability and lifespan. Therefore, although existing solenoid valves have achieved proportional pressure control to a certain extent, they still have significant shortcomings in terms of durability, response consistency, anti-jamming ability, and process feasibility, making it difficult to fully meet the stringent requirements of high-performance suspension systems for the fast, accurate, and reliable operation of actuators.

[0004] In summary, there is an urgent need in this field for a new type of electronically controlled suspension proportional pressure solenoid valve that can achieve better electromagnetic force output characteristics, higher motion reliability, faster dynamic response, and lower manufacturing and assembly difficulty without the need for a magnetic isolation ring, thereby fundamentally improving the overall performance and reliability of the electronically controlled suspension system. Summary of the Invention

[0005] The purpose of this invention is to provide an electronically controlled proportional pressure solenoid valve for suspension without magnetic isolation rings, so as to solve the problems existing in the prior art.

[0006] To achieve the above objectives, the present invention provides the following solution: This invention provides an electronically controlled proportional pressure solenoid valve for suspension without a magnetic ring, comprising: The valve body assembly has an inlet channel, a working chamber, and a control flow channel; The valve core assembly is slidably disposed within the valve body assembly, dividing the working chamber into a high-pressure side and a low-pressure side, and is capable of axial movement within the valve body assembly to change the opening of the control flow channel; A proportional control assembly includes a stop, an armature, and an integrated three-stage valve core arranged coaxially in sequence; the stop is fixedly connected to the valve body assembly and forms part of a magnetic circuit; the armature is disposed in the inner hole of the stop; one end of the integrated three-stage valve core is linked with the armature, and the other end extends into the control flow channel of the valve body assembly and is provided with a second conical surface; A secondary valve seat is fixed inside the valve body assembly and has a first conical surface that mates with the second conical surface; The electromagnetic drive assembly includes a coil assembly sleeved on the outside of the stop; An elastic reset element is disposed between the valve core assembly and the secondary valve seat; The stop, armature, and integrated three-stage valve core constitute a magnetic drive structure without a magnetic isolation ring. When the coil assembly is energized, the generated electromagnetic force drives the armature and integrated three-stage valve core to move axially. By changing the gap between the first and second conical surfaces, the pressure of the medium flowing through the control channel is adjusted, thereby controlling the pressure difference on both sides of the valve core assembly in the reverse direction, causing the valve core assembly to produce a corresponding displacement, and realizing proportional control of the output pressure.

[0007] Preferably, the outer surface of the stop is provided with grooves and / or spiral structures to optimize the magnetic circuit distribution; a thin film to reduce friction is provided between the inner hole of the stop and the armature.

[0008] Preferably, it further includes a stop C and a bearing; the stop C is fixedly connected to the stop and forms another part of the magnetic circuit; the bearing is disposed on the stop C, and the integrated three-stage valve core passes through the bearing and is clearance-fitted with the inner hole; the integrated three-stage valve core is provided with a first step, and the first step contacts the stop C to axially limit the integrated three-stage valve core.

[0009] Preferably, the valve body assembly includes: The valve seat is provided with an inlet hole, a first annular groove, and a first rectangular groove that connects the inlet hole and the first annular groove; The valve core is provided with a second annular groove, a first damping hole, and a first blind hole for accommodating the elastic reset element; The valve body has a second step for fixing the valve seat, a second blind hole that slides with the outer diameter of the valve core, a third step for fixing the secondary valve seat, and a first side hole that communicates with the outside.

[0010] Preferably, the first annular groove, the second annular groove, the first damping orifice, and the second damping orifice provided on the secondary valve seat are all configured to form an expanding flow when the medium flows through, so as to reduce local pressure and increase the hydraulic feedback area acting on the valve core.

[0011] Preferably, the integrated three-stage valve core is provided with a first pressure-inlet hole and a second pressure-inlet hole, which are used to guide the pressure on the rear side of the second-stage valve seat to the front and rear sides of the armature to balance the pressure difference.

[0012] Preferably, the stop iron, stop iron C, armature, and the yoke iron and pole shoe are all made of magnetically conductive metal material and together form a complete magnetic circuit; the valve body assembly, valve core assembly, secondary valve seat and integrated tertiary valve core are all made of non-magnetically conductive material.

[0013] Preferably, the surfaces of the stop iron, stop iron C, armature, yoke iron and pole shoe are coated with a wear-resistant and corrosion-resistant coating; the bearing is a self-lubricating bearing.

[0014] Preferably, it further includes a shim for adjusting the initial axial position of the armature, the shim being disposed between the bottom of the inner hole of the stop and the armature.

[0015] Preferably, it further includes an additional elastic element disposed on the integrated three-stage valve core to define its initial position, wherein the additional elastic element is a cylindrical compression spring, a conical compression spring, or a leaf spring.

[0016] The present invention achieves the following beneficial technical effects compared to the prior art: This invention provides a proportional pressure solenoid valve for electronically controlled suspension with direct proportional control and no magnetic isolation ring. Through a unique electromagnetic structure design and integrated valve core configuration, it achieves greater electromagnetic force output, longer lifespan, faster response speed, and lower processing and assembly difficulty compared to existing technologies within the same size specifications. Specifically, the grooves and spiral structure on the outside of the stop optimize the magnetic circuit distribution and improve magnetic field utilization; the use of a diaphragm and self-lubricating bearing effectively reduces friction between moving parts, significantly improving anti-jamming capability and service life; the setting of the first and second pressure inlet holes balances the pressure before and after the armature, avoiding interference from hydraulic pressure on the valve core movement; the expansion flow design of each annular groove and damping orifice not only reduces local pressure and improves control stability but also increases the hydraulic feedback area, enhancing control linearity and accuracy. The overall structure is simple and reliable, eliminating the need for complex components such as magnetic isolation rings. While ensuring high-performance proportional control, it significantly improves product reliability and process feasibility, making it suitable for vehicle electronically controlled suspension systems with stringent requirements for response speed, control accuracy, and durability. Attached Figure Description

[0017] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0018] Figure 1 This is a schematic diagram of the structure of the electronically controlled proportional pressure solenoid valve for suspension without magnetic isolation ring, provided by the present invention. Detailed Implementation

[0019] The serial numbers assigned to components in this document, such as "first," "second," etc., are merely used to distinguish the described objects and have no sequential or technical meaning. The terms "connection" and "linkage" used in this application, unless otherwise specified, include both direct and indirect connections (linkages). In the description of this invention, it should be understood that the terms "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," and "counterclockwise," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing the invention and for simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the invention.

[0020] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "over," and "on top" of the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0021] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0022] The purpose of this invention is to provide an electronically controlled proportional pressure solenoid valve for suspension without magnetic isolation rings, so as to solve the problems existing in the prior art.

[0023] To make the above-mentioned objects, features and advantages of the present invention more apparent and understandable, the present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0024] Example 1: Please see Figure 1 This invention provides an electronically controlled proportional pressure solenoid valve for suspension without magnetic isolation rings.

[0025] In this embodiment, the electronically controlled suspension proportional pressure solenoid valve without magnetic isolation ring mainly includes a valve body assembly, a valve core assembly, a proportional control assembly, a secondary valve seat 5, and an electromagnetic drive assembly.

[0026] Specifically, the valve body assembly constitutes the main structural framework and fluid passage of the solenoid valve. This valve body assembly includes a valve seat 1, a valve body 4, and a secondary valve seat 5. The valve seat 1 has a pressure inlet 18, a first annular groove 19, and a first rectangular groove 20 connecting the two. The exterior of the valve seat 1 is fixedly connected to the second step 30 on the interior side of the valve body 4 via an interference fit. The valve body 4 also has a second blind hole 31, a third step 32, a first through hole 33, and a first side hole 34 for connecting to the external environment. The secondary valve seat 5 is fixedly installed at the third step 32 of the valve body 4, also using an interference fit connection. The secondary valve seat 5 has multiple second damping holes 24 evenly distributed along its axial direction, and a first conical surface 25 located at its center.

[0027] The valve core assembly is the core moving component that responds to pressure changes and adjusts the opening of the main valve port. This assembly includes a valve core 2 and a main spring 3. The valve core 2 is slidably disposed within the valve body 4, and its outer diameter forms a small-clearance sliding seal with the inner wall of the second blind hole 31 of the valve body 4, thereby dividing the internal space into a high-pressure side and a low-pressure side. The valve core 2 is machined with a second annular groove 21, a first damping hole 22, and a blind hole structure, namely the first blind hole 23. The main spring 3 is housed within the first blind hole 23, with one end abutting against the valve core 2 and the other end supported on the secondary valve seat 5, providing the main valve core 2 with its initial reset force.

[0028] The proportional control component is the core of this invention for achieving high-precision and rapid electro-hydraulic proportional conversion, and it adopts a magnetic circuit design without a magnetic isolation ring. This component mainly consists of a stop 8, an armature 9, an integrated three-stage valve core 15, a stop C17, and a bearing 16. The stop 8, as a key magnetically conductive component, is externally fitted with the pole shoe 11 and the yoke 6 to achieve axial positioning. Its outer shell is machined with special grooves and a spiral structure to optimize the magnetic field distribution path. A gasket 14, a diaphragm 10, and the armature 9 are sequentially placed in the inner hole of the stop 8. The gasket 14 can be used to fine-tune the initial axial position of the armature 9; the diaphragm 10 is located between the armature 9 and the inner wall of the stop 8, effectively reducing friction during relative movement. The stop C17 is fixedly connected to the right end of the stop 8 via an interference fit, together forming a complete magnetic circuit. A bearing 16, preferably a self-lubricating bearing, is press-fitted into the left hole of the stop C17. The integrated three-stage valve core 15 passes through the inner hole of the bearing 16, and the two are in a small-clearance sliding seal fit. The left end of the integrated three-stage valve core 15 is linked with the armature 9, and the right end extends towards the secondary valve seat 5, and a second conical surface 26 is machined at its end. This second conical surface 26 cooperates with the first conical surface 25 on the secondary valve seat 5. In addition, the integrated three-stage valve core 15 is also provided with a first pressure hole 27, a second pressure hole 29, and a first step 28 for axial limiting. This first step 28 contacts the stop C17.

[0029] The electromagnetic drive assembly, which provides controllable electromagnetic force, includes a coil assembly 13, a yoke 6, a pole shoe 11, and a clamp 12. The coil assembly 13 is fitted onto the external magnetic circuit structure formed by the stop 8 and the yoke 6. The yoke 6 is interference-fitted with the valve body 4 and the stop 8, and a sealing ring 7 is installed on its outer side to ensure the overall sealing of the solenoid valve. The pole shoe 11 is entirely encapsulated within the coil assembly 13. The coil assembly 13 and the yoke 6 are securely connected by the clamp 12 to prevent loosening. When the coil assembly 13 is energized, the magnetic field generated by the current forms a closed magnetic circuit through the pole shoe 11, yoke 6, stop 8, and stop C17, driving the magnetically conductive armature 9 to move.

[0030] In this invention, all components constituting the magnetic circuit, including stop 8, stop C17, armature 9, yoke 6, and pole shoe 11, are made of magnetically conductive metal materials, and their surfaces are coated with a wear-resistant and corrosion-resistant coating to improve durability. Conversely, all non-magnetic circuit components, including valve body 4, valve seat 1, valve core 2, main spring 3, secondary valve seat 5, and integrated tertiary valve core 15, are made of non-magnetically conductive materials to avoid interfering with the main magnetic circuit.

[0031] The working principle of this invention is as follows: In the initial state without power, the preload of the main spring 3 keeps the valve core 2 at an initial opening. When the coil assembly 13 receives control current from the vehicle control unit and is energized, the generated electromagnetic force drives the armature 9 to move to the right. The armature 9 then pushes the integrated three-stage valve core 15, which is linked to it, to move to the right against the hydraulic pressure at its right end cone surface. The movement of the integrated three-stage valve core 15 changes the gap between its second cone surface 26 and the first cone surface 25 of the secondary valve seat 5. This gap controls the flow area of ​​a pilot control flow. By utilizing the "expansion flow" effect generated when fluid flows through the conical gap, the pressure here can be precisely adjusted. This pressure change is transmitted in reverse to the internal control cavity of the valve seat 1.

[0032] Specifically, the working medium (such as hydraulic oil) enters through the pressure inlet 18, flows through the first rectangular groove 20 to the first annular groove 19, and this process generates a first expansion flow, initially reducing the pressure and increasing the hydraulic feedback area to the valve core 2. The medium then passes through the second annular groove 21 and the first damping hole 22 on the valve core 2, undergoing another expansion flow process, and the pressure is further adjusted. Finally, this controlled pressure acts on the end face of the valve core 2. When the pressure in the control chamber changes, the pressure difference on both sides of the valve core 2 changes accordingly. This pressure difference force overcomes the force of the main spring 3, driving the valve core 2 to undergo axial displacement within the valve body 4, thereby changing the opening of the main valve port between the valve seat 1 and the valve core 2, realizing continuous and proportional control of the output flow channel pressure. The function of the first pressure inlet 27 and the second pressure inlet 29 is to guide the pressure on the right side of the secondary valve seat 5 to the front and rear chambers of the armature 9, balancing its axial hydraulic pressure, and ensuring that the electromagnetic force can be used accurately and directly to control the cone surface clearance without overcoming additional hydraulic clamping force.

[0033] Furthermore, as an extended embodiment of the present invention, additional elastic elements, such as cylindrical compression springs, conical compression springs, or leaf springs, can be added to the integrated three-stage valve core 15 to help limit its initial position or provide additional restoring force, thereby further optimizing the dynamic response characteristics.

[0034] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0035] It should be noted that the components mentioned in the above embodiments are all general standard parts or components known to those skilled in the art. Their structures and principles can be learned by those skilled in the art through technical manuals or conventional experimental methods.

[0036] This invention has used specific examples to illustrate its principles and implementation methods. The above descriptions of the embodiments are only for the purpose of helping to understand the method and core ideas of this invention. Furthermore, those skilled in the art will recognize that, based on the ideas of this invention, there will be changes in the specific implementation methods and application scope. Therefore, the content of this specification should not be construed as a limitation of this invention.

Claims

1. A proportional pressure solenoid valve for an electronically controlled suspension system with direct proportional control and no magnetic isolation ring, characterized in that, include: The valve body assembly has an inlet channel, a working chamber, and a control flow channel; The valve core assembly is slidably disposed within the valve body assembly, dividing the working chamber into a high-pressure side and a low-pressure side, and is capable of axial movement within the valve body assembly to change the opening of the control flow channel; A proportional control assembly includes a stop, an armature, and an integrated three-stage valve core arranged coaxially in sequence; the stop is fixedly connected to the valve body assembly and forms part of a magnetic circuit; the armature is disposed in the inner hole of the stop; one end of the integrated three-stage valve core is linked with the armature, and the other end extends into the control flow channel of the valve body assembly and is provided with a second conical surface; A secondary valve seat is fixed inside the valve body assembly and has a first conical surface that mates with the second conical surface; The electromagnetic drive assembly includes a coil assembly sleeved on the outside of the stop; An elastic reset element is disposed between the valve core assembly and the secondary valve seat; The stop, armature, and integrated three-stage valve core constitute a magnetic drive structure without a magnetic isolation ring. When the coil assembly is energized, the generated electromagnetic force drives the armature and integrated three-stage valve core to move axially. By changing the gap between the first and second conical surfaces, the pressure of the medium flowing through the control channel is adjusted, thereby controlling the pressure difference on both sides of the valve core assembly in the reverse direction, causing the valve core assembly to produce a corresponding displacement, and realizing proportional control of the output pressure.

2. The electronically controlled proportional pressure solenoid valve for suspension without magnetic isolation ring according to claim 1, characterized in that, The outer side of the stop is provided with grooves and / or spiral structures to optimize the magnetic circuit distribution; a thin film to reduce friction is provided between the inner hole of the stop and the armature.

3. The electronically controlled proportional pressure solenoid valve for suspension without magnetic isolation ring according to claim 2, characterized in that, It also includes a stop C and a bearing; the stop C is fixedly connected to the stop and forms another part of the magnetic circuit; the bearing is disposed on the stop C, and the integrated three-stage valve core passes through the bearing and is clearance-fitted with the inner hole; the integrated three-stage valve core is provided with a first step, and the first step contacts the stop C to axially limit the integrated three-stage valve core.

4. The electronically controlled proportional pressure solenoid valve for suspension without magnetic isolation ring according to claim 1, characterized in that, The valve body assembly includes: The valve seat is provided with an inlet hole, a first annular groove, and a first rectangular groove that connects the inlet hole and the first annular groove; The valve core is provided with a second annular groove, a first damping hole, and a first blind hole for accommodating the elastic reset element; The valve body is provided with a second step for fixing the valve seat, a second blind hole that slides with the outer diameter of the valve core, a third step for fixing the secondary valve seat, and a first side hole that communicates with the outside.

5. The electronically controlled proportional pressure solenoid valve for suspension without magnetic isolation ring according to claim 4, characterized in that, The first annular groove, the second annular groove, the first damping orifice, and the second damping orifice provided on the secondary valve seat are all configured to form an expanding flow when the medium flows through, so as to reduce local pressure and increase the hydraulic feedback area acting on the valve core.

6. The electronically controlled proportional pressure solenoid valve for suspension without magnetic isolation ring according to claim 1, characterized in that, The integrated three-stage valve core is provided with a first pressure-inlet hole and a second pressure-inlet hole, which are used to guide the pressure on the rear side of the secondary valve seat to the front and rear sides of the armature to balance the pressure difference.

7. The electronically controlled proportional pressure solenoid valve for suspension without magnetic isolation ring according to claim 3, characterized in that, The stop iron, stop iron C, armature, and also the yoke iron and pole shoe are all made of magnetically conductive metal material and together form a complete magnetic circuit; the valve body assembly, valve core assembly, secondary valve seat and integrated tertiary valve core are all made of non-magnetically conductive material.

8. The electronically controlled proportional pressure solenoid valve for suspension without magnetic isolation ring according to claim 7, characterized in that, The surfaces of the stop iron, stop iron C, armature, yoke iron, and pole shoe are coated with a wear-resistant and corrosion-resistant coating; the bearing is a self-lubricating bearing.

9. The electronically controlled proportional pressure solenoid valve for suspension without magnetic isolation ring according to claim 1, characterized in that, It also includes a shim for adjusting the initial axial position of the armature, the shim being disposed between the bottom of the inner hole of the stop and the armature.

10. The electronically controlled proportional pressure solenoid valve for suspension without magnetic isolation ring according to claim 1, characterized in that, It also includes an additional elastic element disposed on the integrated three-stage valve core to define its initial position, the additional elastic element being a cylindrical compression spring, a conical compression spring, or a leaf spring.

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