Solenoid valve and damper

Abstract

An electromagnetic valve and a shock absorber. The electromagnetic valve comprises a main relief valve part and a pilot valve part; the main relief valve part comprises a first housing and a relief valve body located in the first housing; the pilot valve part comprises a second housing and a pilot valve located in the second housing; the pilot valve part is arranged on one side of the main relief valve part in a first direction, the main relief valve part comprises an oil return channel between the first housing and the relief valve body, the relief valve body comprises a pilot valve port and a first valve body part surrounding the pilot valve port, the pilot valve is arranged in cooperation with the pilot valve port, the pilot valve part further comprises a floating ring and a pressure relief structure, the floating ring is configured to form a pilot valve cavity with the relief valve body, the floating ring is configured to be movable in the first direction, when the floating ring is located closest to the relief valve body, the pilot valve cavity is communicated with the oil return channel through the pressure relief structure. Thus, the electromagnetic valve can efficiently realize safety in failure.

Description

Technical Field

[0001] Embodiments of this disclosure relate to a solenoid valve and a vibration damper. Background Technology

[0002] In a car's suspension system, because the springs themselves reciprocate while filtering road vibrations, shock absorbers are typically installed to improve ride comfort and suppress the oscillations caused by the springs rebounding after absorbing shocks. Therefore, shock absorbers reduce vibrations in the chassis and body to improve ride comfort.

[0003] On the other hand, with the rapid development of the automobile industry and the continuous improvement of people's living standards, people have higher and higher requirements for the ride comfort of automobiles. Shock absorbers with a single damping value can no longer meet people's needs, and shock absorbers with adjustable damping values ​​have emerged accordingly. Summary of the Invention

[0004] The disclosed embodiment provides a solenoid valve and a vibration damper. In this solenoid valve, when the floating ring is located closest to the overflow valve body, the pilot valve chamber is connected to the return oil channel through a pressure relief structure. Therefore, the working fluid can enter the return oil channel through the pressure relief structure. Since the floating ring is located closest to the overflow valve body, the working fluid can only enter the return oil channel through the pressure relief structure with a smaller cross-sectional area, thus damping the entry of the working fluid into the return oil channel. At this time, the pressure difference between the inlet and outlet of the solenoid valve at a given flow rate is independent of the current. Therefore, this solenoid valve can efficiently achieve safety in case of failure. Furthermore, the pressure difference before the turning current does not change with the current, but after reaching the turning current, the pressure difference changes sharply, making the distinction between the two states very clear and facilitating controller state recognition, resulting in greater safety and reliability. In addition, the structure of this solenoid valve is relatively simple, reducing costs and improving reliability.

[0005] At least one embodiment of this disclosure provides a solenoid valve, comprising: a main relief valve portion including a first housing and a relief valve body located within the first housing; a pilot valve portion including a second housing and a pilot valve located within the second housing; the pilot valve portion is disposed on one side of the main relief valve portion in a first direction, the main relief valve portion including a return oil passage located between the first housing and the relief valve body, the relief valve body including a pilot valve port and a first valve body portion surrounding the pilot valve port, the pilot valve cooperating with the pilot valve port, the pilot valve portion further including a floating ring and a pressure relief structure, the floating ring being configured to form a pilot valve cavity with the relief valve body, the floating ring being configured to be movable in the first direction, and when the floating ring is located at the position closest to the relief valve body, the pilot valve cavity is connected to the return oil passage through the pressure relief structure.

[0006] For example, in a solenoid valve provided in an embodiment of this disclosure, the pilot valve portion further includes a flow pad, the flow pad being located between the first valve body portion of the overflow valve body and the floating ring, the floating ring being configured to press the flow pad against the first valve body portion, and the pressure relief structure including a pressure relief opening located on the flow pad.

[0007] For example, in a solenoid valve provided in one embodiment of this disclosure, the pressure relief structure includes a first groove located on the first valve body portion, the first groove facing the opening of the floating ring.

[0008] For example, in a solenoid valve provided in one embodiment of this disclosure, the pressure relief structure includes a second groove located on the floating ring, the second groove opening toward the first valve body portion.

[0009] For example, in a solenoid valve provided in one embodiment of this disclosure, the pressure relief structure includes a pressure relief hole located on the side wall of the floating ring, the pressure relief hole penetrating the side wall of the floating ring.

[0010] For example, in a solenoid valve provided in one embodiment of this disclosure, the pilot valve portion further includes a preload spring, which is disposed in contact with the floating ring and configured to apply a force toward the first valve body portion to the floating ring.

[0011] For example, in a solenoid valve provided in an embodiment of this disclosure, the floating ring includes: a base plate portion, which is spaced apart from the overflow valve body; and an annular portion, which is connected to the edge of the base plate portion. The side of the base plate portion away from the overflow valve body includes a spring receiving groove, and one end of the preload spring is disposed in the spring receiving groove.

[0012] For example, an embodiment of the solenoid valve provided in this disclosure further includes: an electromagnetic drive unit located on the side of the pilot valve unit away from the main relief valve unit, the electromagnetic drive unit including an armature support, the armature support being configured to apply a force away from the first valve body unit to the floating ring when magnetized.

[0013] For example, in a solenoid valve provided in one embodiment of this disclosure, the electromagnetic drive unit further includes: a third housing; an armature shaft located within the third housing; and an armature located within the third housing and on the side of the armature support away from the pilot valve. The armature support includes a first intermediate through hole, and the armature includes a second intermediate through hole. The armature shaft passes through the first intermediate through hole and the second intermediate through hole, and one end of the armature shaft is connected to the pilot valve.

[0014] For example, in a solenoid valve provided in an embodiment of this disclosure, the electromagnetic drive unit further includes: an end cap portion located on the side of the armature away from the armature support; and an upper cavity located between the armature support and the end cap portion, wherein the armature shaft includes a first communicating groove configured to communicate the pilot valve cavity and the upper cavity.

[0015] For example, in a solenoid valve provided in one embodiment of this disclosure, the armature further includes a second connecting groove configured to connect the two sides of the armature in the first direction.

[0016] For example, in a solenoid valve provided in one embodiment of this disclosure, the electromagnetic drive unit further includes: a magnetic isolation ring sleeved on the armature; and an electromagnet located between the magnetic isolation ring and the third housing.

[0017] For example, in a solenoid valve provided in one embodiment of this disclosure, the flow gasket includes: an annular gasket portion; a central opening located at the center of the annular gasket portion; and a pressure relief opening located at the edge of the annular gasket portion, with one end exposed from the edge of the annular gasket portion.

[0018] For example, in a solenoid valve provided in one embodiment of this disclosure, the flow gasket includes a plurality of pressure relief openings, which are uniformly arranged along the circumference of the annular gasket.

[0019] For example, in a solenoid valve provided in an embodiment of this disclosure, the first valve body portion of the overflow valve body includes an edge groove and an edge portion located away from the pilot valve port in the edge groove, and the orthographic projection of the pressure relief opening on the first valve body portion overlaps with the edge groove portion.

[0020] For example, in a solenoid valve provided in an embodiment of this disclosure, the main overflow valve portion further includes: an overflow valve seat, including an inlet, an outlet, and a partition located between the inlet and the outlet; the overflow valve body further includes a second valve body portion, which is fixed integrally with the first valve body portion and includes a plate-shaped valve body portion and an annular valve body portion; the plate-shaped valve body portion is disposed at a distance from the first valve body portion; the annular valve body portion is located at the edge of the plate-shaped valve body portion; the overflow valve body is configured to be movable in the first direction, such that the annular valve body portion and the partition form an overflow valve port.

[0021] For example, in a solenoid valve provided in one embodiment of this disclosure, the material of the first valve body portion is different from the material of the second valve body portion.

[0022] For example, in a solenoid valve provided in one embodiment of this disclosure, the strength and machinability of the material of the first valve body portion are greater than the strength and machinability of the material of the second valve body portion, respectively.

[0023] For example, in a solenoid valve provided in an embodiment of this disclosure, the main overflow valve part further includes a stop spring, the overflow valve seat further includes an outer ring part located on the side of the liquid outlet away from the partition part and fixed to the first housing, and the stop spring is disposed between the outer ring part and the first valve body part.

[0024] For example, in a solenoid valve provided in one embodiment of this disclosure, the stop spring includes a wave plate.

[0025] For example, in a solenoid valve provided in an embodiment of this disclosure, the pilot valve section includes a plurality of the flow pads, which are stacked along the first direction.

[0026] At least one embodiment of this disclosure also provides a vibration damper that includes the solenoid valve described in any of the preceding claims. Attached Figure Description

[0027] To more clearly illustrate the technical solutions of the embodiments of this disclosure, the accompanying drawings of the embodiments will be briefly described below. Obviously, the drawings described below only relate to some embodiments of this disclosure and are not intended to limit this disclosure.

[0028] Figure 1 This is a schematic diagram of the structure of a solenoid valve provided in one embodiment of the present disclosure;

[0029] Figure 2 This is a schematic diagram of the structure of a flow gasket in a solenoid valve according to an embodiment of the present disclosure;

[0030] Figure 3 for Figure 1 An enlarged schematic diagram of region A shown;

[0031] Figure 4 This is a schematic diagram of the structure of a flow gasket in another solenoid valve provided in an embodiment of the present disclosure;

[0032] Figure 5 This is a schematic diagram of a flow gasket and a floating ring in a solenoid valve according to an embodiment of the present disclosure;

[0033] Figure 6 This is a schematic diagram of another pressure relief structure provided in an embodiment of the present disclosure;

[0034] Figure 7 This is a schematic diagram of another pressure relief structure provided in an embodiment of the present disclosure;

[0035] Figure 8 This is a schematic diagram of another pressure relief structure provided in an embodiment of the present disclosure;

[0036] Figure 9 This is a schematic diagram of another pressure relief structure provided in an embodiment of the present disclosure;

[0037] Figure 10 A schematic diagram of another pressure relief structure provided in an embodiment of this disclosure; and

[0038] Figure 11 This is a schematic diagram of a vibration damper provided in one embodiment of the present disclosure. Detailed Implementation

[0039] To make the objectives, technical solutions, and advantages of the embodiments of this disclosure clearer, the technical solutions of the embodiments of this disclosure will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this disclosure. All other embodiments obtained by those skilled in the art based on the described embodiments of this disclosure without creative effort are within the scope of protection of this disclosure.

[0040] Unless otherwise defined, the technical or scientific terms used in this disclosure shall have the ordinary meaning understood by one of ordinary skill in the art to which this disclosure pertains. The terms “first,” “second,” and similar terms used in this disclosure do not indicate any order, quantity, or importance, but are merely used to distinguish different components. Terms such as “comprising” or “including” mean that an element or object preceding the word encompasses the elements or objects listed following the word and their equivalents, without excluding other elements or objects. Terms such as “connected” or “linked” are not limited to physical or mechanical connections, but can include electrical connections, whether direct or indirect.

[0041] With the development of automotive electrification and autonomous driving technologies, vehicle weight has increased and power performance has improved. Therefore, shock absorbers need to operate over a wider range, requiring continuously adjustable damping characteristics. This can be achieved using a continuously adjustable solenoid valve.

[0042] The continuously adjustable damping solenoid valve used in automotive shock absorbers needs to perform two functions: first, continuously adjustable damping, in which case the operating current range of the solenoid valve is I to Imax; second, safety in case of failure, in which case the operating current range of the solenoid valve is 0 to I. In other words, besides achieving continuously adjustable damping under the drive of the operating current, the solenoid valve used in automotive shock absorbers also needs to ensure safety in the event of power failure or actuator failure, thereby guaranteeing basic driving and handling safety. For example, in the event of power failure or actuator failure, the damping of the solenoid valve can be maintained at a midpoint within its adjustable range, thus ensuring basic driving and handling safety. It should be noted that the aforementioned I can also be called the turning current, and its value is typically 300–450 mA, with some reaching 600 mA.

[0043] Typical solenoid valves achieve fail-safe operation by controlling the pilot valve's oil circuit, primarily through two methods: controlling the return oil path and controlling the pilot valve's mechanical preload. Controlling the return oil path to achieve fail-safe operation mainly involves reducing the return oil path before the turning current I, such as by adjusting the opening cross-section of the return oil path or the deformation of the valve plate. This method is characterized by a gradual decrease in the pressure difference between the inlet and outlet before the turning current I, with a relatively gentle pressure difference transition; after reaching the turning current, it enters normal operation, i.e., a continuously adjustable damping state. Controlling the pilot valve's mechanical preload mainly involves using a floating ring and a preload spring to press down the pilot valve. The pressure difference between the inlet and outlet and the turning current are adjusted by modifying parameters such as the preload spring stiffness, armature shaft extension length, floating ring clearance, and pilot valve clearance. In this case, multiple variable parameters are coupled together, increasing the difficulty of adjustment. Similarly, the pressure difference between the inlet and outlet before the transition current I gradually decreases as the 0-I current increases, and the transition of the pressure difference is relatively slow.

[0044] In this embodiment, a solenoid valve is provided, comprising a main relief valve portion and a pilot valve portion. The main relief valve portion includes a first housing and a relief valve body located within the first housing. The pilot valve portion includes a second housing and a pilot valve located within the second housing. The pilot valve portion is disposed on one side of the main relief valve portion in a first direction. The main relief valve portion includes a return oil passage located between the first housing and the relief valve body. The relief valve body includes a pilot valve port and a first valve body portion surrounding the pilot valve port. The pilot valve is configured to cooperate with the pilot valve port. The pilot valve portion also includes a floating ring and a pressure relief structure. The floating ring is configured to form a pilot valve cavity with the relief valve body. The floating ring is configured to be movable in the first direction. When the floating ring is located at the position closest to the relief valve body, the pilot valve cavity is connected to the return oil passage through the pressure relief structure. When the floating ring is positioned closest to the overflow valve body, the pilot valve chamber is connected to the return oil channel via the pressure relief structure. Therefore, the working fluid can enter the return oil channel through the pressure relief structure. Because the floating ring is closest to the overflow valve body, the working fluid can only enter the return oil channel through the pressure relief structure with its smaller cross-sectional area, thus damping the entry of the working fluid into the return oil channel. At this time, the pressure difference between the inlet and outlet of the solenoid valve at a given flow rate is independent of the current. Therefore, this solenoid valve can efficiently achieve safety in case of failure. Furthermore, the pressure difference before the turning current does not change with the current, but after reaching the turning current, the pressure difference changes sharply, making the distinction between the two states very clear and facilitating controller state recognition, resulting in greater safety and reliability. In addition, the structure of this solenoid valve is relatively simple, reducing costs and improving reliability.

[0045] This disclosure also provides a vibration damper including the aforementioned solenoid valve. Therefore, this vibration damper can achieve continuously adjustable damping under the drive of the operating current, and can also maintain safety in the event of power failure or drive failure, thereby ensuring basic driving and handling safety.

[0046] The electromagnetic valve and vibration damper provided in the embodiments of this disclosure will now be described in detail with reference to the accompanying drawings.

[0047] One embodiment of this disclosure provides a solenoid valve. Figure 1 This is a schematic diagram of the structure of a solenoid valve provided in one embodiment of the present disclosure. Figure 1As shown, the solenoid valve 400 includes a main relief valve section 100 and a pilot valve section 200; the main relief valve section 100 includes a first housing 110 and a relief valve body 120 located within the first housing 110; the pilot valve section 200 includes a second housing 210 and a pilot valve 220 located within the second housing 210. The pilot valve section 200 is disposed on one side of the main relief valve section 100 in the first direction X. The main relief valve section 100 includes a return oil passage 430 located between the first housing 110 and the relief valve body 120. The relief valve body 120 includes a pilot valve port 122 and a first valve body section 124 surrounding the pilot valve port 122. The pilot valve 220 is configured to cooperate with the pilot valve port 122. For example, the pilot valve 220 is pressed against the pilot valve port 122, thereby blocking the pilot valve port 122. When the pressure of the pilot valve port 122 reaches a certain level, the fluid can overcome the pressure of the pilot valve 220 and flow out.

[0048] like Figure 1 As shown, the pilot valve section 200 also includes a floating ring 230 and a pressure relief structure 290. The floating ring 230 is configured to form a pilot valve cavity 440 with the relief valve body 120. The floating ring 230 is configured to be movable in the first direction X, and is located at the position closest to the relief valve body 120 when the solenoid valve fails. When the floating ring 230 is located at the position closest to the relief valve body 120, the pilot valve cavity 440 is connected to the return oil passage 430 through the pressure relief structure 290.

[0049] In the solenoid valve provided in this embodiment, when the floating ring is located closest to the overflow valve body, the pilot valve chamber is connected to the return oil channel through a pressure relief structure. Therefore, the working fluid can enter the return oil channel through the pressure relief structure. Since the floating ring is located closest to the overflow valve body, the working fluid can only enter the return oil channel through the pressure relief structure with a smaller cross-sectional area, and cannot enter through the gap between the floating ring and the overflow valve body, thus damping the entry of the working fluid into the return oil channel. At this time, the pressure difference between the inlet and outlet of the solenoid valve at a given flow rate is independent of the current. Therefore, this solenoid valve can efficiently achieve safety in case of failure, and the pressure difference before the turning current does not change with the current. After reaching the turning current, the pressure difference changes sharply, making the distinction between the two states very clear, which is more conducive to the controller's state recognition and makes it safer and more reliable. In addition, the structure of this solenoid valve is relatively simple, which can reduce costs and improve reliability. It should be noted that the gap between the floating ring and the overflow valve body caused by poor machining accuracy and errors is not considered as the aforementioned pressure relief structure.

[0050] For example, the cross-sectional area of ​​the aforementioned pressure relief structure is at least 1 / 20th of the cross-sectional area of ​​the maximum gap between the floating ring and the overflow valve body. Therefore, in the event of solenoid valve failure, the working fluid can enter the return oil passage through the pressure relief structure with a smaller cross-sectional area, simultaneously generating appropriate damping. It should be noted that the above ratio can be adjusted according to the actual product requirements.

[0051] In some examples, such as Figure 1 As shown, the pilot valve section 200 also includes a flow pad 230, which is located on the side of the first valve body section 124 of the overflow valve body 120 near the pilot valve 200, that is, between the first valve body section 124 of the overflow valve body 120 and the floating ring 240; the floating ring 240 is configured to press the flow pad 230 against the first valve body section 124, and the pressure relief structure 290 includes a pressure relief opening 232 on the flow pad 230.

[0052] In the solenoid valve provided in this embodiment, since the flow pad includes a pressure relief opening, the working fluid of the solenoid valve can enter the return oil passage from the pressure relief opening of the flow pad. Simultaneously, because the floating ring presses the flow pad against the first valve body, it dampens the entry of the working fluid into the return oil passage. At this time, the pressure difference between the inlet and outlet of the solenoid valve at a given flow rate is independent of the current. Therefore, this solenoid valve can efficiently achieve safety in case of failure, and the pressure difference before the turning current does not change with the current; after reaching the turning current, the pressure difference changes sharply, making the distinction between the two states very clear, which is more conducive to the controller's state recognition and makes it safer and more reliable. In addition, the structure of this solenoid valve is relatively simple, which can reduce costs and improve reliability.

[0053] In some examples, such as Figure 1 As shown, the floating ring 240 is configured to be movable in a first direction X. The pilot valve section 200 also includes a preload spring 250, which is disposed in contact with the floating ring 240 and configured to apply a force toward the first valve body section 124 or the flow pad 230 to the floating ring 240. Thus, a force toward the first valve body section or the flow pad is applied to the floating ring by the preload spring, and the damping of the solenoid valve can also be set by adjusting the parameters of the preload spring.

[0054] In some examples, such as Figure 1As shown, the solenoid valve 400 also includes an electromagnetic drive unit 300 located on the side of the pilot valve unit 200 away from the main relief valve unit 100. The electromagnetic drive unit 300 includes an armature support 320, which is configured to apply a force away from the first valve body unit 124 or the flow pad 230 to the floating ring 240 when magnetized. Thus, when the electromagnetic drive unit is functioning correctly, the armature support is magnetized and applies a force away from the first valve body unit or the flow pad to the floating ring. This force overcomes the spring force of the preload spring, causing the floating ring to move away from the flow pad, thereby preventing the floating ring from pressing against the flow pad. At this time, the pressure difference between the inlet and outlet of the solenoid valve is related to the drive current, and the damping of the solenoid valve can be controlled by controlling the drive current.

[0055] It should be noted that, Figure 1 The pilot valve section shown includes only a single flow pad, but embodiments of this disclosure include, but are not limited to, multiple flow pads stacked along the first direction X.

[0056] For example, the pilot valve section may include a single flow gasket, two flow gaskets, or three flow gaskets, as long as they can form an effective oil passage.

[0057] In some examples, such as Figure 1 As shown, the first housing 110 and the second housing 210 can be separate structures, which are then sealed together.

[0058] For example, such as Figure 1 As shown, a portion of the first housing 110 can be fitted onto the outside of the second housing 210 and sealed together by a threaded seal.

[0059] In some examples, such as Figure 1 As shown, the size of the floating ring 240 in the second direction Y is smaller than the size of the overflow valve body 120 in the second direction Y, and the aforementioned second direction Y is perpendicular to the first direction X.

[0060] Figure 2 This is a schematic diagram of the structure of a flow gasket in a solenoid valve according to an embodiment of the present disclosure; Figure 3 for Figure 1 An enlarged schematic diagram of region A is shown. (See attached image.) Figure 2 As shown, the flow pad 230 includes an annular pad portion 234 and a central opening 235; the central opening 235 is located at the center of the annular pad portion 234, and the pressure relief opening 232 is located at the edge of the annular pad portion 234, with one end exposed from the edge of the annular pad portion 234. Thus, the position of the central opening corresponds to the position of the pilot valve port mentioned above, and the pressure relief opening allows the working fluid of the solenoid valve to flow out through the pressure relief opening.

[0061] like Figure 3 As shown, the first valve body portion 124 of the overflow valve body 120 includes an edge groove 1242 and an edge portion 1244 located on the edge groove 1242 away from the pilot valve port 122. The orthographic projection of the pressure relief opening 232 on the first valve body portion 124 partially overlaps with the edge groove 1242. Thus, the working fluid in the pilot valve chamber 440 can flow through the edge groove 1242 and the pressure relief opening 232 into the return oil chamber 430.

[0062] Figure 4 This is a schematic diagram of the structure of a flow gasket in another solenoid valve provided in an embodiment of this disclosure. Figure 4 As shown, the overflow gasket 230 includes a plurality of pressure relief openings 232, which are evenly arranged along the circumference of the annular gasket 234.

[0063] For example, such as Figure 4 As shown, the overflow gasket 230 includes two pressure relief openings 232, which are arranged opposite to each other.

[0064] Figure 5 This is a schematic diagram of a flow gasket and a floating ring in a solenoid valve according to an embodiment of this disclosure. Figure 1 and Figure 5 As shown, the floating ring 240 includes a base plate portion 242 and an annular portion 244. The base plate portion 242 is spaced apart from the overflow valve body 120, and the annular portion 244 is connected to the edge of the base plate portion 242 and configured to press the overflow gasket 230 against the first valve body portion 124. The side of the base plate portion 242 away from the overflow valve body 120 includes a spring receiving groove 2422, and one end of the preload spring 250 is disposed in the spring receiving groove 2422. When the preload spring 250 is in a compressed state, a force toward the overflow valve body 120 can be applied to the floating ring 240.

[0065] In some examples, such as Figure 1 and Figure 5 As shown, the bottom plate portion 242 of the floating ring 240 also includes a plurality of through holes 2424 located around the spring receiving groove 2422. The through holes 2424 on the bottom plate portion 242 allow the working fluid of the solenoid valve to flow through.

[0066] In some examples, such as Figure 1 As shown, the electromagnetic drive unit 300 also includes a third housing 310, an armature shaft 330, and an armature 340; the armature shaft 330 is located inside the third housing 310; the armature 340 is located inside the third housing 310 and is located on the side of the armature support 320 away from the pilot valve 220. The armature support 320 includes a first intermediate through hole 320H, and the armature 340 includes a second intermediate through hole 340H. The armature shaft 330 passes through the first intermediate through hole 320H and the second intermediate through hole 340H, and one end of the armature shaft 330 is connected to the pilot valve 220.

[0067] In some examples, such as Figure 1 As shown, the electromagnetic drive unit 300 also includes an end cap 350 and an upper cavity 360. The end cap 350 is located on the side of the armature 340 away from the armature support 320, and the upper cavity 360 is located between the armature support 320 and the end cap 350. The armature shaft 330 includes a first connecting groove 335, configured to connect the pilot valve cavity 440 and the upper cavity 360. Thus, the working fluid in the pilot valve cavity 440 can flow into the upper cavity 360, and the working fluid in the upper cavity 360 can flow into the pilot valve cavity 440, thereby providing a hydraulic circuit that balances the pressure in the two cavities, thereby improving the stability of the solenoid valve.

[0068] In some examples, such as Figure 1 As shown, the armature 340 also includes a second connecting groove 345, which is configured to connect the two sides of the armature 340 in the first direction, thereby balancing the pressure on both sides of the armature 340.

[0069] In some examples, such as Figure 1 As shown, the electromagnetic drive unit 300 also includes a magnetic shielding ring 370 and an electromagnet 380; the magnetic shielding ring 370 is sleeved on the armature 340, and the electromagnet 380 is located between the magnetic shielding ring 370 and the third housing 310.

[0070] In some examples, such as Figure 1 As shown, the main overflow valve section 100 also includes an overflow valve seat 130, which includes an inlet 132, an outlet 134, and a partition 133 located between the inlet 132 and the outlet 134; the inlet 132 and the outlet 134 can also serve as the inlet and outlet of the hydraulic valve 300. The overflow valve body 120 also includes a second valve body section 125, which is fixed integrally with the first valve body section 124, and includes a plate-shaped valve body section 1252 and an annular valve body section 1254. The plate-shaped valve body section 1252 is disposed opposite to the first valve body section 124, and the annular valve body section 1254 is located at the edge of the plate-shaped valve body section 1252. The overflow valve body 120 is configured to be movable in a first direction, such that the annular valve body section 1254 and the partition 133 form an overflow valve port 140.

[0071] like Figure 1As shown, when the solenoid valve is not malfunctioning, that is, when the driving current of the solenoid valve is greater than the turning current, the armature support 320 in the electromagnetic drive unit 300 is magnetized, applying a force away from the overflow gasket 230 to the floating ring 240, thereby overcoming the elastic force of the preload spring 250, so that the floating ring 240 no longer presses against the overflow gasket 230. At this time, the working fluid entering from the inlet 132 can enter the pilot valve chamber 440 through the pilot valve port 122, and then flow into the return oil passage through the first valve body 124; when the pressure in the pilot valve chamber 440 is balanced with the pressure between the first valve body 124 and the second valve body 125, the overflow valve body 120 as a whole will move away from the overflow valve seat 130, so that the annular valve body 1254 and the partition 133 form the overflow valve port 140, which is opened. In this process, the pressure of the pilot valve 220 on the pilot valve port 122 can be adjusted by the electromagnetic drive unit, thereby adjusting the opening degree of the overflow valve port 140, and thus adjusting the damping of the solenoid valve.

[0072] In some examples, such as Figure 1 As shown, the oil return channel 430 is connected to the liquid outlet 134.

[0073] In some examples, such as Figure 1 As shown, the first valve body 124 and the second valve body 125 are independent components, which are then pressed together (or welded) to form a whole. When the first valve body 124 and the second valve body 125 are pressed together, a sealing ring 127 can also be provided at the joint position of the first valve body 124 and the second valve body 125 to improve the sealing performance.

[0074] In some examples, the material of the first valve body 124 is different from the material of the second valve body 125. Therefore, the manufacturing cost of the overflow valve body 120 can be reduced by using different materials.

[0075] In some examples, the material of the first valve body portion 124 has greater strength and machinability than that of the material of the second valve body portion 125. Since the first valve body portion 124 needs to contact the pilot valve 220 and withstand significant pressure changes, it requires greater strength. On the other hand, to ensure a proper seal between the pilot valve port 122 and the pilot valve 220, the pilot valve port 122 requires a high surface finish. In summary, the first valve body portion has high requirements for material strength and machinability. Therefore, dividing the overflow valve body 120 into a first valve body portion 124 and a second valve body portion 125, and using a material with greater strength and higher machinability for the first valve body portion 124, while using a material with lower strength and lower machinability for the second valve body portion 125, significantly reduces the manufacturing cost of the overflow valve body.

[0076] In some examples, such as Figure 1 As shown, the main overflow valve section 100 also includes a stop spring 150; the overflow valve seat 130 also includes an outer ring section 135, located on the side of the outlet 134 away from the partition section 133, and fixed to the first housing 110. The stop spring 150 is disposed between the outer ring section 135 and the first valve body section 124. Thus, the stop spring 150 can prevent the overflow valve seat 130 from loosening under various operating conditions, and provides a space to adjust the gap between the overflow valve seat 130 and the overflow valve body 120, and supports the aforementioned return oil passage.

[0077] In some examples, the stop spring 150 includes a corrugated plate. Because corrugated plates are inexpensive and easy to standardize, using them as stop springs can reduce the manufacturing cost of the solenoid valve; additionally, the openings on the corrugated plate can form a stop edge, providing an oil passage. Furthermore, the corrugated plate has a low overall height and a large compressible relative distance.

[0078] Figure 6 This is a schematic diagram of another pressure relief structure provided in an embodiment of this disclosure. Figure 6 As shown, the pressure relief structure 290 includes a first groove 291 on the first valve body portion 124 and a pressure relief hole 293 on the side wall of the floating ring 240. The first groove 291 opens toward the floating ring 240, and the pressure relief hole 293 penetrates the side wall of the floating ring 240.

[0079] In the solenoid valve provided in this embodiment, when the floating ring is located closest to the overflow valve body, the pilot valve chamber is connected to the return oil channel through the aforementioned first groove and pressure relief hole. Therefore, the working fluid can enter the return oil channel through the first groove and pressure relief hole. Since the floating ring is located closest to the overflow valve body, the working fluid can only enter the return oil channel through the first groove and pressure relief hole, which have a smaller cross-sectional area, and cannot enter through the gap between the floating ring and the overflow valve body. This damping of the working fluid entering the return oil channel is achieved. At this time, the pressure difference between the inlet and outlet of the solenoid valve at a given flow rate is independent of the current. Thus, the solenoid valve can efficiently achieve safety in case of failure. Furthermore, the pressure difference before the turning current does not change with the current, but after reaching the turning current, the pressure difference changes sharply, making the distinction between the two states very clear and facilitating controller state recognition, resulting in greater safety and reliability. In addition, the structure of this solenoid valve is relatively simple, reducing costs and improving reliability.

[0080] It should be noted that, although Figure 6 The pressure relief structure 290 includes both a first groove 291 and a pressure relief hole 293, but embodiments of this disclosure include, but are not limited to, the pressure relief structure may also include only the first groove or the pressure relief hole.

[0081] Figure 7This is a schematic diagram of another pressure relief structure provided in an embodiment of this disclosure. Figure 7 As shown, the pressure relief structure 290 includes a first groove 291 located on the first valve body portion 124 and a second groove 292 located on the floating ring 240. The first groove 291 opens toward the floating ring 240, and the second groove 292 opens toward the first valve body portion 124.

[0082] In the solenoid valve provided in this embodiment, when the floating ring is located closest to the overflow valve body, the pilot valve chamber is connected to the return oil channel through the first and second grooves. Therefore, the working fluid can enter the return oil channel through the first and second grooves. Since the floating ring is located closest to the overflow valve body, the working fluid can only enter the return oil channel through the first and second grooves with smaller cross-sectional areas, and cannot enter through the gap between the floating ring and the overflow valve body, thus damping the entry of the working fluid into the return oil channel. At this time, the pressure difference between the inlet and outlet of the solenoid valve at a given flow rate is independent of the current. Therefore, this solenoid valve can efficiently achieve safety in case of failure, and the pressure difference before the turning current does not change with the current. After reaching the turning current, the pressure difference changes sharply, making the distinction between the two states very clear, which is more conducive to the controller's state recognition and makes it safer and more reliable. In addition, the structure of this solenoid valve is relatively simple, which can reduce costs and improve reliability.

[0083] Figure 8 This is a schematic diagram of another pressure relief structure provided in an embodiment of this disclosure. Figure 8 As shown, the pressure relief structure 290 includes a second groove 292 located on the floating ring 240, the second groove 292 opening toward the first valve body portion 124.

[0084] In the solenoid valve provided in this embodiment, when the floating ring is located closest to the overflow valve body, the pilot valve chamber is connected to the return oil channel through the aforementioned second groove. Therefore, the working fluid can enter the return oil channel through the second groove. Since the floating ring is located closest to the overflow valve body, the working fluid can only enter the return oil channel through the second groove with a smaller cross-sectional area, and cannot enter through the gap between the floating ring and the overflow valve body, thus damping the entry of the working fluid into the return oil channel. At this time, the pressure difference between the inlet and outlet of the solenoid valve at a given flow rate is independent of the current. Therefore, this solenoid valve can efficiently achieve safety in case of failure, and the pressure difference before the turning current does not change with the current; after reaching the turning current, the pressure difference changes sharply, making the distinction between the two states very clear, which is more conducive to the controller's state recognition and makes it safer and more reliable. In addition, the structure of this solenoid valve is relatively simple, which can reduce costs and improve reliability.

[0085] Figure 9This is a schematic diagram of another pressure relief structure provided in one embodiment of this disclosure. Figure 9 As shown, the pressure relief structure 290 includes a pressure relief hole 293 located on the side wall of the floating ring 240, and the pressure relief hole 293 penetrates the side wall of the floating ring 240.

[0086] In the solenoid valve provided in this embodiment, when the floating ring is located closest to the overflow valve body, the pilot valve chamber is connected to the return oil channel through the aforementioned pressure relief hole. Therefore, the working fluid can enter the return oil channel through the pressure relief hole. Since the floating ring is located closest to the overflow valve body, the working fluid can only enter the return oil channel through the pressure relief hole with a smaller cross-sectional area, and cannot enter the return oil channel through the gap between the floating ring and the overflow valve body, thus damping the entry of the working fluid into the return oil channel. At this time, the pressure difference between the inlet and outlet of the solenoid valve at a given flow rate is independent of the current. Therefore, this solenoid valve can efficiently achieve safety in case of failure, and the pressure difference before the turning current does not change with the current; after reaching the turning current, the pressure difference changes sharply, making the distinction between the two states very clear, which is more conducive to the controller's state recognition and makes it safer and more reliable. In addition, the structure of this solenoid valve is relatively simple, which can reduce costs and improve reliability.

[0087] Figure 10 This is a schematic diagram of another pressure relief structure provided in one embodiment of this disclosure. Figure 10 As shown, the pressure relief structure 290 includes a first groove 291 located on the first valve body portion 124, the first groove 291 opening toward the floating ring 240.

[0088] In the solenoid valve provided in this embodiment, when the floating ring is located closest to the overflow valve body, the pilot valve cavity is connected to the return oil channel through the aforementioned first groove. Therefore, the working fluid can enter the return oil channel through the first groove. Since the floating ring is located closest to the overflow valve body, the working fluid can only enter the return oil channel through the first groove with a smaller cross-sectional area, and cannot enter through the gap between the floating ring and the overflow valve body, thus damping the entry of the working fluid into the return oil channel. At this time, the pressure difference between the inlet and outlet of the solenoid valve at a given flow rate is independent of the current. Therefore, this solenoid valve can efficiently achieve safety in case of failure, and the pressure difference before the turning current does not change with the current; after reaching the turning current, the pressure difference changes sharply, making the distinction between the two states very clear, which is more conducive to the controller's state recognition and makes it safer and more reliable. In addition, the structure of this solenoid valve is relatively simple, which can reduce costs and improve reliability. At least one embodiment of this disclosure also provides a vibration damper. Figure 11 This is a schematic diagram of a vibration damper provided according to an embodiment of the present disclosure. Figure 11As shown, the shock absorber 500 includes the aforementioned solenoid valve 400. Therefore, the shock absorber can achieve continuously adjustable damping under the drive of the operating current, and can also maintain safety in the event of power failure or drive failure, thereby ensuring basic driving and handling safety.

[0089] The following points need to be explained:

[0090] (1) The accompanying drawings of the embodiments of this disclosure only involve the structures involved in the embodiments of this disclosure. Other structures can be referred to the general design.

[0091] (2) Where there is no conflict, features of the same embodiment and different embodiments of this disclosure can be combined with each other.

[0092] The above are merely specific embodiments of this disclosure, but the scope of protection of this disclosure is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the scope of the technology disclosed in this disclosure should be included within the scope of protection of this disclosure. Therefore, the scope of protection of this disclosure should be determined by the scope of the claims.

Claims

1. A solenoid valve, comprising: The main relief valve section includes a first housing and a relief valve body located within the first housing; as well as The pilot valve section includes a second housing and a pilot valve located within the second housing; The pilot valve section is disposed on one side of the main relief valve section in a first direction. The main relief valve section includes a return oil passage located between the first housing and the relief valve body. The relief valve body includes a pilot valve port and a first valve body section surrounding the pilot valve port. The pilot valve is configured to cooperate with the pilot valve port and is configured to press against the pilot valve port, such that after the pressure at the pilot valve port reaches a certain level, the fluid can overcome the pressure of the pilot valve. The pilot valve section further includes a floating ring and a pressure relief structure. The floating ring is configured to form a pilot valve cavity with the overflow valve body. The floating ring is configured to be movable in the first direction. When the solenoid valve fails, it is located at the position closest to the overflow valve body. When the floating ring is located at the position closest to the overflow valve body, the pilot valve cavity is connected to the return oil passage through the pressure relief structure. One end of the pressure relief structure is located inside the pilot valve cavity, and the other end of the pressure relief structure is located in the return oil passage. The pilot valve section further includes a flow-through gasket located between the first valve body section of the overflow valve body and the floating ring. The flow-through gasket includes an annular gasket section and a central opening located at the center of the annular gasket section. The annular gasket section is fitted against the surface of the first valve body section near the floating ring and abuts against both the floating ring and the first valve body section. The floating ring presses the annular gasket section firmly against the first valve body section. The pressure relief structure includes a pressure relief opening located on the flow-through gasket. The pressure relief opening is situated at the outer edge of the annular gasket portion, with one end located within the pilot valve cavity and the other end exposed from the outer edge of the annular gasket portion to communicate with the return oil passage. Alternatively, the pressure relief structure includes a pressure relief hole located on the side wall of the floating ring, the pressure relief hole penetrating the side wall of the floating ring, one end of the pressure relief hole being located inside the pilot valve cavity, and the other end of the pressure relief hole being located in the oil return passage.

2. The solenoid valve according to claim 1, wherein the pilot valve portion further includes a preload spring, which is disposed in contact with the floating ring and configured to apply a force toward the first valve body portion to the floating ring.

3. The electromagnetic valve according to claim 2, wherein The floating ring includes: The base plate is spaced apart from the overflow valve body; and The annular portion is connected to the edge of the base plate portion. The bottom plate portion includes a spring receiving groove on the side away from the overflow valve body, and one end of the pre-tightening spring is disposed in the spring receiving groove.

4. The solenoid valve according to any one of claims 1-3 further comprises: The electromagnetic drive unit is located on the side of the pilot valve unit away from the main relief valve unit. The electromagnetic drive unit includes an armature support, which is configured to apply a force away from the first valve body to the floating ring when it is magnetized.

5. The electromagnetic valve according to claim 4, wherein The electromagnetic drive unit also includes: Third shell; The armature shaft is located within the third housing; and The armature is located within the third housing and on the side of the armature support away from the pilot valve. The armature support includes a first intermediate through hole, the armature includes a second intermediate through hole, the armature shaft passes through the first intermediate through hole and the second intermediate through hole, and one end of the armature shaft is connected to the pilot valve.

6. The electromagnetic valve according to claim 5, wherein The electromagnetic drive unit also includes: The end cap portion is located on the side of the armature away from the armature support; The upper cavity is located between the armature support and the end cap. The armature shaft includes a first connecting groove, which is configured to connect the pilot valve cavity and the upper cavity.

7. The electromagnetic valve according to claim 6, wherein The armature also includes a second connecting slot configured to connect the two sides of the armature in the first direction.

8. The electromagnetic valve according to claim 6, wherein The electromagnetic drive unit also includes: A magnetic shielding ring is fitted onto the armature; An electromagnet is located between the magnetic shielding ring and the third housing.

9. The solenoid valve according to any one of claims 1-3, wherein, The overflow gasket includes a plurality of pressure relief openings, which are evenly arranged along the circumference of the annular gasket.

10. The solenoid valve according to claim 9, wherein, The first valve body portion of the overflow valve body includes an edge groove and an edge portion located away from the pilot valve port in the edge groove, and the orthographic projection of the pressure relief opening on the first valve body portion overlaps with the edge groove portion.

11. The solenoid valve according to any one of claims 1-3, wherein, The main overflow valve section also includes: The overflow valve seat includes an inlet, an outlet, and a partition between the inlet and the outlet. The overflow valve body further includes a second valve body portion, which is fixed integrally with the first valve body portion, and includes a plate-shaped valve body portion and an annular valve body portion. The plate-shaped valve body portion is disposed at a distance from the first valve body portion, and the annular valve body portion is located at the edge of the plate-shaped valve body portion. The overflow valve body is configured to be movable in the first direction such that the annular valve body portion and the partition portion form an overflow valve port.

12. The solenoid valve according to claim 11, wherein, The material of the first valve body is different from the material of the second valve body.

13. The solenoid valve according to claim 12, wherein, The strength and machinability of the material of the first valve body are greater than those of the material of the second valve body.

14. The solenoid valve according to claim 11, wherein, The main overflow valve section also includes: Stop spring, The overflow valve seat further includes an outer ring portion located on the side of the liquid outlet away from the partition portion, and fixed to the first housing. The stop spring is disposed between the outer ring portion and the first valve body portion.

15. The solenoid valve according to claim 14, wherein, The stop spring includes a wave plate.

16. The solenoid valve according to any one of claims 1-3, wherein, The pilot valve section includes a plurality of flow pads, which are stacked along the first direction.

17. A vibration damper comprising a solenoid valve according to any one of claims 1-16.

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