Pilot operated solenoid valve device and shock absorber

Abstract

The utility model relates to a kind of pilot operated electromagnetic valve device and shock absorber.Pilot operated electromagnetic valve device includes: first port (9);Second port (10);Main valve (1), it includes main valve shell (2), main valve core (3) and first elastic component (4), main valve core can slide in main valve shell in the longitudinal direction of main valve in first direction and second direction opposite each other;Main valve further includes sealing ring, sealing ring has circular ring-like sealing beam, sealing beam is used to seal the cavity in main valve shell located in the longitudinal direction both sides of main valve core, wherein, sealing beam sequentially includes first portion (1061), second portion (1062) and third portion (1063) from outside to inside in transverse direction perpendicular to longitudinal direction, first portion is clamped by main valve shell, third portion is clamped by main valve core, wherein, sealing beam has total length L in transverse direction, second portion has second length l2 in transverse direction, wherein, main valve shell and main valve core are thus configured, so that 0.6≤l2:L≤0.7.

Description

Technical Field

[0001] This invention relates to pilot-operated solenoid valve devices and shock absorbers. Background Technology

[0002] In air suspension systems and industrial fluid control, traditional pneumatic control valves commonly employ direct-acting solenoid valves to control the on / off state of high-pressure air circuits. These valves face numerous technical bottlenecks in practical applications. For example, when the operating pressure exceeds 20 bar, the fluid pressure on the valve core assembly can result in an unbalanced force exceeding 300 N. Traditional designs, to address this issue, are forced to employ complex multi-stage sealing structures, which not only increase manufacturing costs and reduce reliability but also lead to excessively large axial dimensions of the valve body, making it difficult to meet the installation requirements of compact equipment. Furthermore, to balance the force of the high-pressure fluid, existing solutions must use high-stiffness return springs, directly increasing the power consumption of the solenoid and failing to meet the energy-saving requirements of modern equipment. Utility Model Content

[0003] Therefore, the purpose of this utility model is to provide a pilot-operated solenoid valve device and a shock absorber, wherein the sealing device can have improved fatigue resistance, and the pilot-operated solenoid valve device and the shock absorber themselves can also achieve electromagnetic control with low energy consumption.

[0004] According to one aspect of this invention, the above objective can be achieved by a pilot-operated solenoid valve device. The pilot-operated solenoid valve device includes: a first port, a second port, and a main valve.

[0005] Preferably, the main valve includes a main valve housing, a main valve core, and a first elastic member, wherein the main valve core is capable of sliding within the main valve housing in the longitudinal direction of the main valve along a first direction and a second direction that are opposite to each other, so as to connect a first port and a second port when located in a first position on the first direction side and disconnect the first port and the second port when located in a second position on the second direction side, wherein the first port guides fluid to a cavity in the main valve housing located on the second direction side of the main valve core.

[0006] Preferably, the main valve further includes a sealing ring having a sealing beam for sealing cavities located on both sides of the main valve core in the main valve housing. The sealing beam comprises a first part, a second part, and a third part in a transverse direction perpendicular to the longitudinal direction, from the outside to the inside. The first part is held by the main valve housing, and the third part is held by the main valve core. The sealing beam has a total length L in the transverse direction, and the second part has a second length l2 in the transverse direction. The main valve housing and the main valve core are constructed such that 0.6 ≤ l2: L ≤ 0.7.

[0007] In some preferred embodiments, the main valve housing and main valve core are constructed such that l2:L = 0.65.

[0008] In some preferred embodiments, the first portion has a first length l1 in the transverse direction, thus constructing the main valve housing such that 0.1≤l1:L≤0.2; the third portion has a third length l3 in the transverse direction, thus constructing the main valve core such that 0.15≤l3:L≤0.25.

[0009] In some preferred embodiments, when the main valve core is in the first position, the longitudinal center of the first part and the longitudinal center of the third part have a longitudinal length s in the longitudinal direction of the main valve, thus constructing the main valve housing and the main valve core such that 0.35≤s:L≤0.45.

[0010] In some preferred embodiments, the sealing ring further includes a first retaining portion located radially outward of the sealing beam and a second retaining portion located radially inward of the sealing beam, the first retaining portion being fixed to the main valve housing and the second retaining portion being fixed to the main valve core.

[0011] In some preferred embodiments, the pilot-operated solenoid valve device further includes: a third port, a pilot valve, and a balance channel.

[0012] Preferably, the pilot valve is configured as a solenoid valve to control the connection or disconnection of the main valve to the first port and the second port by means of an energized state. The pilot valve includes a pilot valve housing, a pilot valve core, and a second elastic member. The pilot valve core is slidable in the pilot valve housing along a third and a fourth direction opposite to each other in the longitudinal direction of the pilot valve. The third port guides the fluid from the first port to a cavity in the pilot valve housing located on the fourth direction side of the pilot valve core.

[0013] Preferably, the balancing channel includes: a first section configured to connect a cavity in the pilot valve housing located on the third direction side of the pilot valve core and a cavity in the main valve housing located on the second direction side of the main valve core; a second section configured as an internal passage of the pilot valve core, and the second section connecting the cavity in the pilot valve housing located on the third direction side of the pilot valve core and a cavity on the fourth direction side; and a third section configured to connect the cavity in the pilot valve housing located on the fourth direction side of the pilot valve core and a cavity in the main valve housing located on the first direction side of the main valve core.

[0014] In some preferred embodiments, the first elastic member is a compression spring, which is preloaded between the ends of the main valve housing and the main valve core facing the first direction.

[0015] In some preferred embodiments, the second elastic member is a compression spring preloaded between the pilot valve housing and the third-direction end of the pilot valve core.

[0016] In some preferred embodiments, the electromagnetic driving force of the pilot valve is designed to be greater than the sum of the fluid force borne by the pilot valve core on the fourth direction side and the preload force of the second elastic member.

[0017] In some preferred embodiments, the diameter of the pilot valve is smaller than that of the main valve, and the pressure-bearing area of ​​the pilot valve core is smaller than that of the main valve core.

[0018] According to another aspect of the present invention, the above-mentioned objective can also be achieved by a shock absorber. This shock absorber includes a pilot-operated solenoid valve device constructed according to the above embodiment.

[0019] The pilot-operated solenoid valve device and shock absorber constructed according to the embodiments of this utility model achieve uniform distribution of deformation stress on the sealing beam, reduced peak stress in the clamping area, and reduced plastic deformation under cyclic loads by precisely controlling the length of the free section of the sealing beam, the proportion of the clamping section, and the longitudinal clamping offset. This improves the fatigue resistance of the sealing ring and extends its service life.

[0020] Furthermore, the pilot-operated solenoid valve device and shock absorber constructed according to the embodiments of this utility model achieve significant energy-saving effects in both the pilot valve being energized (first working state) and de-energized (second working state). In the first working state, through the design of the internal channel of the pilot valve core, the high-pressure fluid forms a pressure balance through the third port and the balance channel, allowing the main valve core to remain open only by overcoming the residual elastic force of the first elastic member, significantly reducing the holding current requirement. In the second working state, the hydraulic self-locking mechanism formed after the pilot valve is de-energized allows the main valve core to reliably close through the combined action of fluid back pressure and the pre-tightening force of the first elastic member, requiring no additional energy consumption to maintain the closed state. Therefore, this synergistic energy-saving design in both working states enables the pilot-operated solenoid valve device to maintain the lowest energy consumption level in both the opening and closing phases. Here, with the reduced pressure on the sealing ring in the main valve, the service life of the sealing ring can be extended accordingly. Attached Figure Description

[0021] The features, advantages, and technical effects of exemplary embodiments of this application will now be described with reference to the accompanying drawings.

[0022] Figure 1 This is a first longitudinal sectional view of a pilot-operated solenoid valve device according to an embodiment in a first operating state.

[0023] Figure 2 It is based on Figure 1 A second longitudinal sectional view of the pilot-operated solenoid valve device in the first operating state of an embodiment.

[0024] Figure 3 It is based on Figure 1 A first longitudinal sectional view of the pilot-operated solenoid valve device in the second operating state of an embodiment.

[0025] Figure 4 It is based on Figure 1A second longitudinal sectional view of the pilot-operated solenoid valve device in the second operating state of an embodiment.

[0026] Figure 5 This is a partial longitudinal cross-sectional view of the main valve in the sealing ring region of a pilot-operated solenoid valve device according to one embodiment. Detailed Implementation

[0027] Figures 1 to 4 A pilot-operated solenoid valve device according to an embodiment of the present invention is shown. Specifically, Figure 1 and Figure 2 The diagram shows views of different longitudinal cross-sections of the pilot-operated solenoid valve device in its first operating state. Figure 3 and Figure 4 The diagram shows views of different longitudinal sections of the pilot-operated solenoid valve device in its second operating state.

[0028] The pilot-operated solenoid valve device according to this embodiment can be applied to the shock absorber system of a vehicle. In some embodiments, the volume combination of the shock absorber chambers can be quickly switched via the pilot-operated solenoid valve device, for example, switching between a single-chamber mode with a volume of V1 and a dual-chamber mode with a volume of V1+V2, thereby achieving graded adjustment or stepless adjustment of the damping force.

[0029] like Figures 1 to 4 As shown, the pilot-operated solenoid valve device has three ports: a first port 9, a second port 10, and a third port 11. The first port 9 and the third port 11 are used to connect to a shock absorber chamber with a volume of V1, and the second port 10 is used to connect to a shock absorber chamber with a volume of V2. By controlling the connection state of the first port 9 and the second port 10, the volume combinations of the aforementioned shock absorber chambers can be quickly switched.

[0030] The pilot-operated solenoid valve device according to this embodiment includes a main valve 1, a pilot valve 5, and a balance channel 12.

[0031] The main valve 1 is configured to control the connection or disconnection of the first port 9 and the second port 10. The main valve 1 includes a main valve housing 2, a main valve core 3, and a first elastic member 4. The main valve core 3 is capable of sliding within the main valve housing 2 in the longitudinal direction of the main valve 1 along a first direction (referring to direction A) and a second direction (referring to direction B) that are opposite to each other, so as to connect the first port 9 and the second port 10 when in a first position on the first direction side and disconnect the first port 9 and the second port 10 when in a second position on the second direction side. The first elastic member 4 is a compression spring, which is preloaded between the main valve housing 2 and the end of the main valve core 3 facing the first direction.

[0032] Pilot valve 5 is configured as a solenoid valve to control the connection or disconnection of main valve 1 to first port 9 and second port 10 by means of an energized state. Pilot valve 5 includes pilot valve housing 6, pilot valve core 7, and second elastic member 8. Pilot valve core 7 is capable of sliding within pilot valve housing 6 in opposite third and fourth directions along the longitudinal direction of pilot valve 5. Second elastic member 8 is a compression spring preloaded between pilot valve housing 6 and the third-direction-oriented end of pilot valve core 7.

[0033] The main valve 1 and the pilot valve 5 are arranged adjacent to each other. Here, the main valve housing 2 of the main valve core 3 and the pilot valve housing 6 of the pilot valve 5 can be integrally constructed, separately constructed, or share some components.

[0034] In this embodiment, the sliding direction of the main valve core 3 of the main valve 1 is consistent with the sliding direction of the pilot valve core 7 of the pilot valve 5. Here, the first sliding direction of the main valve core 3 is the same as the third sliding direction of the pilot valve core 7, which is referred to in [reference needed]. Figures 1 to 4 The direction marked A in the attached figure (based on the upward direction in the attached figure); the second direction of the sliding of the main valve core 3 is the same as the fourth direction of the sliding of the pilot valve core 7, which is referred to in [reference needed]. Figures 1 to 4 The direction marked B in the attached figure (based on the downward direction in the attached figure).

[0035] In such Figures 1 to 4 In the illustrated embodiment, the longitudinal centerlines of the main valve 1 and the pilot valve 5 coincide, thereby enabling a smaller structural size in the lateral direction perpendicular to the longitudinal direction. In other embodiments, the longitudinal centerlines of the main valve 1 and the pilot valve 5 are arranged in parallel, thereby allowing for adaptation to different installation environments while maintaining a smaller lateral dimension.

[0036] In this embodiment, the first port 9 is located on the longitudinal end of the main valve 1 in the pilot-operated solenoid valve device. The first port 9 guides the high-pressure fluid in the shock absorber chamber with a volume of V1 to the cavity in the main valve housing 2 located on the second direction side of the main valve core 3. The second port 10 is located on the outer peripheral surface of the pilot-operated solenoid valve device. The third port 11 guides the fluid from the first port 9, i.e., the high-pressure fluid also from the shock absorber chamber with a volume of V1, to the cavity in the pilot valve housing 6 located on the fourth direction side of the pilot valve core 7.

[0037] The balancing channel 12 includes a first segment 12a, a second segment 12b, and a third segment 12c. (See also...) Figure 2 and Figure 4The sections shown in dashed lines are as follows: First section 12a is constructed to connect the cavity in the pilot valve housing 6 located on the third direction side (direction A) of the pilot valve core 7 with the cavity in the main valve housing 2 located on the second direction side (direction B) of the main valve core 3. Second section 12b is constructed as an internal passage of the pilot valve core 7, and second section 12b connects the cavity in the pilot valve housing 6 located on the third direction side (direction A) and the cavity on the fourth direction side (direction B) of the pilot valve core 7 with the cavity in the main valve housing 2 located on the first direction side (direction A) of the main valve core 3. First section 12a and third section 12c are formed by the main valve housing 2 and / or the pilot valve housing 6.

[0038] In this embodiment, the electromagnetic driving force of the pilot valve 5 is designed to be greater than the sum of the fluid force borne by the pilot valve core 7 on the fourth direction side and the preload force of the second elastic member 8. The diameter of the pilot valve 5 is smaller than the diameter of the main valve 1, and the pressure-bearing area of ​​the pilot valve core 7 is smaller than the pressure-bearing area of ​​the main valve core 3.

[0039] The two operating states that the pilot-operated solenoid valve device of this embodiment can achieve will be described in detail below.

[0040] In the first operating state of the pilot-operated solenoid valve device, pilot valve 5 is energized, and main valve 1 opens. (See also...) Figure 1 and Figure 2 When the pilot valve 5 is energized, the pilot valve core 7 overcomes the preload of the second elastic member 8 and moves in the third direction (direction A) and eventually holds against the pilot valve housing 6. The balance channel section inside the pilot valve core 7, namely the third section 12b, gradually closes. The fluid in the first direction (direction A) cavity of the main valve core 3 of the main valve 1 enters the fourth direction (direction B) cavity of the pilot valve core 7 through the third section 12c of the balance channel 12. The high-pressure fluid at the first port 9 simultaneously acts on the second direction (direction B) cavity of the main valve core 3, pushing the main valve core 3 to overcome the preload of the first elastic member 4 and move in the first direction (direction A), thereby connecting the first port 9 and the second port 10.

[0041] In the second operating state 2 of the pilot-operated solenoid valve device, pilot valve 5 is de-energized, and main valve 1 is closed. (See also...) Figure 3 and Figure 4After the pilot valve core 7 is de-energized, it moves in the fourth direction (direction B) under the action of the second elastic member 8 and opens its internal balance channel section, namely the third section 12b, until the high-pressure fluid in the cavity of the pilot valve core 7 connected to the third port 11 in the fourth direction is blocked. The fluid in the cavity of the main valve core 3 in the first direction (direction A) cannot flow back due to the closure of the pilot valve core 7, forming a closed back pressure. The fluid pressure on the first elastic member 4 and the main valve core 3 in the first direction (direction A) pushes the main valve core 3 to move towards the second direction (direction B), thereby cutting off the connection between the first port 9 and the second port 10.

[0042] According to this embodiment, the pilot-operated solenoid valve device achieves significant energy savings in both the energized (first operating state) and de-energized (second operating state) states of the pilot valve 5. In the first operating state, through the design of the internal channel of the pilot valve core, the high-pressure fluid achieves pressure balance through the third port 11 and the balance channel 12, allowing the main valve core 3 to remain open only by overcoming the residual elastic force of the first elastic member, significantly reducing the holding current requirement. In the second operating state, the hydraulic self-locking mechanism formed after the pilot valve 5 is de-energized allows the main valve core 3 to reliably close through the combined action of fluid back pressure and the pre-tightening force of the first elastic member 4, requiring no additional energy consumption to maintain the closed state. This energy-saving design in both operating states ensures that the pilot-operated solenoid valve device maintains the lowest energy consumption level throughout the entire operating cycle.

[0043] Furthermore, the pilot-operated solenoid valve device according to this embodiment achieves a highly compact layout. The main valve 1 and the pilot valve 5 are arranged coaxially and adjacently, significantly reducing their lateral dimensions. Each section of the balance channel 12 is directly integrated inside the pilot-operated solenoid valve device, avoiding external connection pipelines. This compact design not only reduces the size of the pilot-operated solenoid valve device compared to traditional structures, but also reduces fluid resistance through the shortest path design of the flow channel, while ensuring precise alignment and low-friction movement of each moving component, such as the main valve core 3 and the pilot valve core 7.

[0044] Figure 5 This is a partial longitudinal cross-sectional view of the main valve in the sealing ring region of a pilot-operated solenoid valve device according to one embodiment. The sealing design according to this embodiment can be used alone for the main valve 1, or in combination with other sealing structures for the main valve 1, to seal the cavities located on both longitudinal sides of the main valve core 3 in the main valve housing 2.

[0045] like Figure 5As shown, the main valve 1 includes a sealing ring having a first retaining portion 105, a second retaining portion 106, and a sealing beam located between the first retaining portion 105 and the second retaining portion 106. Specifically, the first retaining portion 105 is fixed to the main valve housing 2 and located radially outward of the sealing beam. The second retaining portion 107 is fixed to the main valve core 3 and located radially inward of the sealing beam. The sealing beam is generally annular and is mainly used to seal the cavities located on both longitudinal sides of the main valve core 3 in the main valve housing 2. With the help of the first retaining portion 105 and the second retaining portion 107, part of the clamping force is transferred from the sealing beam to the end where more elastic material, such as rubber, is piled up, avoiding excessive mechanical compression directly borne by the sealing beam body.

[0046] The sealing beam, in a transverse direction perpendicular to the longitudinal direction, comprises, from the outside to the inside, a first part 1061, a second part 1062, and a third part 1063. The first part 1061 is held by the main valve body. Figure 5 As shown, the first portion 1061 is held together by the first housing portion 101 and the second housing portion 102 of the main valve housing. Preferably, the first portion 1061 extends in a transverse plane perpendicular to the longitudinal direction of the main valve. The third portion 1063 is held by the main valve core. Figure 5 As shown, the third part 1063 is held together by the first valve core part 103 and the second valve core part 104 of the main valve core. Preferably, the third part 1063 extends in a transverse plane perpendicular to the longitudinal direction of the main valve.

[0047] like Figure 5 As shown, the sealing beam has a total length L in the transverse direction corresponding to the ring width. Based on the aforementioned ring width, the first part 1061 has a first length l1 in the transverse direction, the second part 1062 has a second length l2 in the transverse direction, and the third part 1063 has a third length l3 in the transverse direction. Here, it is preferable to construct the main valve housing 2 and the main valve core 3 such that the ratio of the second length l2 to the total length L satisfies the condition: 0.6 ≤ l2:L ≤ 0.7, preferably l2:L = 0.65. With the design of this embodiment, the sealing beam has sufficient elastic deformation space, avoiding stress concentration, and this design achieves a balance between deformation capacity and stiffness, reducing fatigue of the sealing ring under cyclic loads.

[0048] The main valve housing 2 is preferably constructed such that the ratio of the first length l1 to the total length L satisfies the condition: 0.1 ≤ l1: L ≤ 0.2. The main valve core 3 is preferably constructed such that the ratio of the third length l3 to the total length L satisfies the condition: 0.15 ≤ l3: L ≤ 0.25. This optimizes the clamping lengths on the main valve housing side and the main valve core side, which helps to disperse contact stress and suppress seal tearing.

[0049] like Figure 5As shown, when the main valve core 3 is located in the first position close to the first direction A, in the longitudinal direction of the main valve 1, the longitudinal center of the first part 1061 (e.g., the center of the average thickness of the sealing ring in this region) and the longitudinal center of the third part 1063 (e.g., the center of the average thickness of the sealing ring in this region) have a longitudinal distance s. The main valve housing 2 and the main valve core 3 are constructed such that the ratio of the longitudinal distance s to the total length L satisfies the condition: 0.35 ≤ s: L ≤ 0.45. Through this design, the risk of fatigue cracks in the sealing beam when the main valve core 3 moves longitudinally can be reduced.

[0050] Here, through local design adjustments to the main valve housing 2 and the main valve core 3, the length of the free section of the sealing beam (part two), the proportion of the clamping section, and the longitudinal clamping offset can be precisely controlled in a low-cost manner when using a common sealing ring. This achieves uniform distribution of deformation stress on the sealing beam, a reduced peak stress in the clamping area, and reduced plastic deformation under cyclic loads. Consequently, the fatigue resistance of the sealing ring is improved, and its service life is extended. Especially in applications involving significant impacts, such as vehicle shock absorbers, the pilot-operated solenoid valve device exhibits a long service life and excellent operational stability.

[0051] Obviously, the above embodiments of this utility model are merely examples for clearly illustrating the present utility model, and are not intended to limit the implementation of the present utility model. Those skilled in the art can make other variations or modifications based on the above description. It is neither necessary nor possible to exhaustively list all embodiments here. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this utility model should be included within the protection scope of the claims of this utility model. In the description of this utility model, the terms "first," "second," etc., are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0052] List of reference numerals

[0053] 1. Main valve

[0054] 2 Main valve housing

[0055] 3. Main valve core

[0056] 4 First elastic member

[0057] 5. Pilot valve

[0058] 6. Pilot valve housing

[0059] 7. Pilot valve core

[0060] 8 Second elastic member

[0061] 9 First Port

[0062] 10 Second Port

[0063] 11 Third Port

[0064] 12 Balance Channels

[0065] 12a First Section

[0066] 12b Second Section

[0067] 12c Third Section

[0068] A. First direction, third direction

[0069] B. Second direction, fourth direction

[0070] 101 First Shell Section

[0071] 102 Second shell section

[0072] 103 First valve core

[0073] 104 Second valve core

[0074] 105 First Holding Section

[0075] 1061 Part One

[0076] 1062 Part Two

[0077] 1063 Part Three

[0078] 107 Second Holding Section

[0079] L Total length of sealing beam

[0080] l1 Length of the first part

[0081] The length of the second part of l2

[0082] The length of the third part of l3

[0083] s longitudinal spacing

Claims

1. A pilot-operated solenoid valve device, characterized in that, include: First port (9); Second port (10); Main valve (1), The main valve (1) includes a main valve housing (2), a main valve core (3), and a first elastic member (4). The main valve core (3) is capable of sliding in the longitudinal direction of the main valve (1) within the main valve housing (2) along a first and a second direction that are opposite to each other, so as to connect the first port (9) and the second port (10) when it is in a first position on the first direction side and disconnect the first port (9) and the second port (10) when it is in a second position on the second direction side. The first port (9) guides fluid to a cavity in the main valve housing (2) located on the second direction side of the main valve core (3). The main valve (1) further includes a sealing ring with an annular sealing beam for sealing the cavities in the main valve housing (2) located on both sides of the main valve core (3) in the longitudinal direction. The sealing beam consists of a first part (1061), a second part (1062), and a third part (1063) in the transverse direction perpendicular to the longitudinal direction. The first part (1061) is held by the main valve housing (2), and the third part (1063) is held by the main valve core (3). The sealing beam has a total length L in the transverse direction, and the second part (1062) has a second length l2 in the transverse direction. The main valve housing (2) and the main valve core (3) are constructed such that 0.6 ≤ l2: L ≤ 0.

7.

2. The pilot-operated solenoid valve device according to claim 1, characterized in that, The main valve housing (2) and the main valve core (3) are constructed such that l2:L = 0.

65.

3. The pilot-operated solenoid valve device according to claim 1, characterized in that, The first part (1061) has a first length l1 in the transverse direction, and the main valve housing (2) is constructed such that 0.1≤l1:L≤0.2; The third part (1063) has a third length l3 in the transverse direction, thus constructing the main valve core (3) such that 0.15≤l3:L≤0.

25.

4. The pilot-operated solenoid valve device according to claim 1, characterized in that, When the main valve core (3) is in the first position, the longitudinal center of the first part (1061) and the longitudinal center of the third part (1063) have a longitudinal distance s in the longitudinal direction of the main valve (1), and the main valve housing (2) and the main valve core (3) are constructed such that 0.35≤s:L≤0.

45.

5. The pilot-operated solenoid valve device according to claim 1, characterized in that, The sealing ring further includes a first retaining part (105) located on the radially outer side of the sealing beam and a second retaining part (107) located on the radially inner side of the sealing beam. The first retaining part (105) is fixed to the main valve housing (2), and the second retaining part (107) is fixed to the main valve core (3).

6. The pilot-operated solenoid valve device according to any one of claims 1 to 5, characterized in that, The pilot-operated solenoid valve device also includes: Third port (11); A pilot valve (5) is configured as a solenoid valve to control the connection or disconnection of the main valve (1) to the first port (9) and the second port (10) by means of an energized state. The pilot valve (5) includes a pilot valve housing (6), a pilot valve core (7), and a second elastic member (8). The pilot valve core (7) is slidable in the pilot valve housing (6) in the longitudinal direction of the pilot valve (5) along a third and a fourth direction opposite to each other. The third port (11) guides the fluid from the first port (9) to a cavity in the pilot valve housing (6) located on the fourth direction side of the pilot valve core (7). Balance channel (12), which includes: The first section (12a) is constructed to connect the cavity in the pilot valve housing (6) located on the third direction side of the pilot valve core (7) with the cavity in the main valve housing (2) located on the second direction side of the main valve core (3); The second section (12b) is configured as an internal passage of the pilot valve core (7), and the second section (12b) connects the cavity in the pilot valve housing (6) located on the third direction side of the pilot valve core (7) and the cavity on the fourth direction side. The third section (12c) is constructed to connect the cavity in the pilot valve housing (6) located on the fourth direction side of the pilot valve core (7) with the cavity in the main valve housing (2) located on the first direction side of the main valve core (3).

7. The pilot-operated solenoid valve device according to claim 6, characterized in that, The first elastic member (4) is a compression spring, which is pre-tensioned between the main valve housing (2) and the end of the main valve core (3) facing the first direction; The second elastic member (8) is a compression spring, which is preloaded between the pilot valve housing (6) and the third-direction end of the pilot valve core (7).

8. The pilot-operated solenoid valve device according to claim 6, characterized in that, The electromagnetic driving force of the pilot valve (5) is designed to be greater than the sum of the fluid force carried by the pilot valve core (7) on the fourth direction side and the preload force of the second elastic member (8).

9. The pilot-operated solenoid valve device according to claim 6, characterized in that, The diameter of the pilot valve (5) is smaller than that of the main valve (1), and the pressure-bearing area of ​​the pilot valve core (7) is smaller than that of the main valve core (3).

10. A shock absorber, comprising the pilot-operated solenoid valve device according to any one of claims 1-9.

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