Electromagnetic valve and shock absorber

Abstract

The invention discloses an electromagnetic valve and a shock absorber. The electromagnetic valve comprises a main valve element (19), a pilot valve element (11), a pilot overflow valve needle (12), a first elastic piece (16), a second elastic piece (17) and a magnetic actuator. The main valve element (19) is provided with an overflow channel (15) and a pilot channel (14). When the magnetic actuator is in a power-off state, the acting force of the magnetic actuator disappears, and the pilot valve element (11) moves in the direction away from the pilot overflow valve needle (12) under the elastic force effect of the second elastic piece (17). The displacement of the pilot overflow valve needle (12) is jointly acted by the medium pressure in the first elastic piece (16) and the pilot channel (14), and the acting force directions of the medium pressure in the first elastic piece (16) and the pilot channel (14) are opposite, so that when the medium pressure in the pilot channel (14) reaches a threshold value, the elastic force of the first elastic piece (16) can be overcome, the pilot overflow valve needle (12) is pushed to move to a second conduction position, and the pilot overflow valve needle (12) is stopped from moving. And therefore, the overflow channel (15) is communicated, the pressure in the control cavity is reduced, and the main valve core (19) is in an open state. The electromagnetic valve and the shock absorber work normally under the condition of power failure, and due to the fact that a side channel and a side armature do not need to be arranged, the structure is simplified.

Description

Solenoid valve and shock absorber Technical Field

[0001] The present application relates to a solenoid valve and a shock absorber. Background Art

[0002] Shock absorbers are an important component of the vehicle chassis system, which can effectively buffer the vibrations experienced by the vehicle chassis.

[0003] To prevent shock absorber failure due to circuit failure, existing technologies employ a bypass armature and bypass channel on the piston assembly. When the solenoid valve circuit fails, the bypass armature controls the bypass channel, allowing medium flow between the two chambers and thus achieving a fail-safe mode. However, this approach requires the presence of a bypass armature and bypass channel, resulting in a relatively complex structure.

[0004] Summary of the Invention

[0005] The purpose of the present application is to provide a solenoid valve and a shock absorber with a simple structure that can avoid failure caused by circuit failure.

[0006] The first aspect of the present application provides a solenoid valve for a shock absorber, comprising a main valve core, a pilot valve core, a pilot overflow valve needle, a first elastic member, a second elastic member and a magnetic actuator, wherein the main valve core is provided with an overflow channel and a pilot channel, and the overflow channel and the pilot channel are both connected to the control chamber of the solenoid valve; the pilot overflow valve needle is displaceably arranged in the main valve core, and the moving position of the pilot overflow valve needle includes a cut-off position, a first conduction position and a second conduction position, in the cut-off position, the pilot overflow valve needle cuts off the overflow channel, and in the first conduction position and the second conduction position, the overflow channel is conducted; the medium pressure in the first elastic member and the pilot channel acts on the pilot overflow valve needle Under the action of the first elastic member, the pilot overflow valve needle has a tendency to move from the second conduction position to the cut-off position. Under the action of the medium pressure in the pilot channel, the pilot overflow valve needle has a tendency to move from the cut-off position to the second conduction position. The magnetic actuator and the second elastic member act on the pilot valve core. When the magnetic actuator is energized, it pushes the pilot valve core to move, so that the pilot valve core pushes the pilot overflow valve needle to move to the first conduction position. Under the action of the second elastic member, the pilot valve core has a tendency to move away from the pilot overflow valve needle. When the magnetic actuator is in the de-energized state and the medium pressure in the pilot channel is greater than the threshold, the pilot overflow valve needle moves to the second conduction position.

[0007] According to an embodiment of the present application, the solenoid valve further includes a third elastic member, which acts on the pilot relief valve needle, and the directions of the forces exerted by the third elastic member and the first elastic member on the pilot relief valve needle are opposite.

[0008] According to an embodiment of the present application, the overflow channel includes an axial section and one or more radial sections. Both the radial section and the axial section are arranged on the main valve core, and one end of the radial section is connected to the control chamber, and the other end is connected to the axial section.

[0009] According to an embodiment of the present application, one end of the pilot valve core close to the pilot overflow valve needle is set as a rod-shaped structure, which can extend into the interior of the axial section and abut against the pilot overflow valve needle, and there is a gap between the rod-shaped structure and the side wall of the axial section for medium circulation.

[0010] According to an embodiment of the present application, the axial section is configured as a stepped hole including a large diameter section and a small diameter section, the pilot overflow valve needle is configured as a stepped shaft including a large diameter section and a small diameter section, the stepped shaft is correspondingly arranged in the stepped hole, and the end face of the large diameter section of the stepped shaft can seal the small diameter section of the stepped hole.

[0011] According to an embodiment of the present application, the stepped hole includes a first small diameter section and a first large diameter section; the stepped shaft includes a second small diameter section, a second large diameter section and a third large diameter section, wherein the second large diameter section and the third large diameter section are respectively arranged at opposite ends of the second small diameter section; the radial section is connected to the side wall of the first small diameter section, the diameter of the second small diameter section is smaller than the diameter of the first small diameter section, and when the second large diameter section is located in the first small diameter section, the two can form a sealing fit to cut off the overflow channel.

[0012] According to an embodiment of the present application, one end of the pilot channel is connected to the control chamber, and the other end is connected to the small diameter section of the axial section.

[0013] According to an embodiment of the present application, the first elastic member is arranged in the large-diameter section of the axial section, and the third elastic member is arranged in the small-diameter section of the axial section.

[0014] According to an embodiment of the present application, the radial segments are provided in plurality and the plurality of radial segments are evenly distributed along the circumferential direction with the axial segment as the center.

[0015] A second aspect of the present application provides a shock absorber, comprising the solenoid valve as described in any one of the above items.

[0016] The solenoid valve provided in the present application includes a main valve core, a pilot valve core, a pilot overflow valve needle, a first elastic member, a second elastic member and a magnetic actuator, wherein the main valve core is provided with an overflow channel and a pilot channel. When the magnetic actuator is energized, the magnetic actuator pushes the pilot valve core to operate, and the pilot valve core pushes the pilot overflow valve needle to move to the first conduction position. When the pilot overflow valve needle is in the first conduction position, the overflow channel is connected, thereby enabling the overflow and pressure relief of the control chamber to be realized, so that the main valve core is opened. When the magnetic actuator is in the de-energized state, the force of the magnetic actuator disappears, and the pilot valve core is displaced in the direction away from the pilot overflow valve needle under the elastic force of the second elastic member, and the control effect of the pilot valve core on the pilot overflow valve needle disappears. The displacement of the pilot overflow valve needle is jointly affected by the first elastic member and the medium pressure in the pilot channel, and the directions of the forces acting on the first elastic member and the medium pressure in the pilot channel are opposite. When the medium pressure in the pilot channel reaches a threshold, it overcomes the elastic force of the first elastic member, pushing the pilot relief valve needle to the second conduction position, thereby opening the relief channel. At this point, due to the flow of the medium, the medium pressure in the control chamber drops, causing the main valve core, under the influence of the medium pressure in the front chamber of the main valve, to overcome the medium pressure in the control chamber and lift off the main valve seat, thus entering the open state. This arrangement allows the solenoid valve and shock absorber provided in this application to operate normally in the event of a power outage, and simplifies the structure by eliminating the need for a bypass channel and bypass armature. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] FIG1 is a schematic diagram showing a solenoid valve magnetic actuator according to an embodiment of the present application in a power-off state and with a pilot relief valve needle in a second conduction position;

[0018] 2 is a schematic diagram showing a solenoid valve magnetic actuator according to an embodiment of the present application in a powered state with a pilot relief valve needle in a first conduction position;

[0019] FIG3 is a partial schematic diagram showing a solenoid valve according to an embodiment of the present application. DETAILED DESCRIPTION

[0020] The following detailed description and accompanying drawings are used to illustrate the principles of the present application. The present application is not limited to the preferred embodiments described, and the scope of protection of the present application is defined by the claims.

[0021] It should be noted that the orientations or positional relationships indicated in this specification are based on the orientations or positional relationships described in the accompanying drawings and are only for the convenience and simplification of description, and do not indicate or imply that the device referred to must have a specific orientation or be constructed in a specific orientation. Therefore, it should not be understood as a limitation on this application.

[0022] Figure 1 is a schematic diagram showing the solenoid valve magnetic actuator according to an embodiment of the present application in a power-off state with the overflow channel open; Figure 2 is a schematic diagram showing the solenoid valve magnetic actuator according to an embodiment of the present application in a power-on state with the overflow channel open.

[0023] As shown in Figures 1 and 2, an embodiment of the present application provides a solenoid valve for use in a shock absorber. The solenoid valve includes a main valve core 19, a pilot valve core 11, a pilot overflow valve needle 12, a first elastic member 16, a second elastic member 17, and a magnetic actuator (not shown). The main valve core 19 is provided with an overflow channel 15 and a pilot channel 14. The overflow channel 15 is connected to the control chamber 13 of the solenoid valve. When the overflow channel 15 is connected, the medium in the control chamber 13 overflows and releases pressure through the overflow channel 15. A damping hole 20 is provided between the control chamber 13 of the solenoid valve and the front chamber 23 of the main valve. When the overflow channel 15 is connected, the control chamber 13 is depressurized, and a pressure difference is formed between the front chamber 23 of the main valve and the control chamber 13. Under the action of the pressure difference, the main valve core 19 can be pushed to move, so that the main valve is opened.

[0024] The pilot relief needle 12 is displaceably disposed within the main valve core 19 and can be positioned between a cutoff position, a first conducting position, and a second conducting position. In the cutoff position, the pilot relief needle 12 blocks the relief passage 15. In the first and second conducting positions, the relief passage 15 is open. The lower end of the pilot valve core 11 can extend into the main valve core 19 and abut against the pilot relief needle 12.

[0025] The first elastic member 16 and the medium pressure within the pilot passage 14 both act on the pilot relief valve needle 12. Under the action of the first elastic member 16, the pilot relief valve needle 12 tends to move from the second conducting position to the blocked position. Under the action of the medium pressure within the pilot passage 14, the pilot relief valve needle 12 tends to move from the blocked position to the second conducting position.

[0026] A magnetic actuator and a second elastic member 17 act on the pilot valve core 11. When energized, the magnetic actuator pushes the pilot valve core 11, causing it to push the pilot relief valve needle 12 to the first conduction position. Under the action of the second elastic member 17, the pilot valve core 11 tends to move away from the pilot relief valve needle 12.

[0027] In some embodiments, the magnetic actuator may be an armature device. When the armature device is energized, it can generate a magnetic field, and the magnetic field force can push the pilot valve core 11 to move.

[0028] When the magnetic actuator is in the power-off state, the force of the magnetic actuator disappears. Under the elastic force of the second elastic member 17, the pilot valve core 11 is displaced in the direction away from the pilot overflow valve needle 12. The control effect of the pilot valve core 11 on the pilot overflow valve needle 12 disappears, that is, the displacement of the pilot overflow valve needle 12 is no longer controlled by the pilot valve core 11. The displacement of the pilot overflow valve needle 12 is affected by the first elastic member 16 and the medium pressure in the pilot channel 14, and the directions of the forces of the first elastic member 16 and the medium pressure in the pilot channel 14 are opposite. When the medium pressure in the pilot channel 14 reaches the threshold, it can overcome the elastic force of the first elastic member 16 and push the pilot overflow valve needle 12 to the second conduction position, thereby making the overflow channel 15 conductive. At this point, the medium pressure in control chamber 13 drops due to the flow of the medium. The main valve core 19, under the action of the medium pressure in the front chamber 23 of the main valve, overcomes the medium pressure in control chamber 13 and lifts off the main valve seat 25, thereby opening the main valve. This arrangement allows the solenoid valve and shock absorber provided in this embodiment to function normally even in a de-energized state. Furthermore, the structure is simplified by eliminating the need for a bypass channel and bypass armature.

[0029] In a further embodiment, the solenoid valve further includes a third elastic member 18. The third elastic member 18 acts on the pilot relief valve needle 12, and the forces exerted on the pilot relief valve needle 12 by the third elastic member 18 and the first elastic member 16 are in opposite directions. That is, the forces exerted on the pilot relief valve needle 12 by the third elastic member 18 and the pressure of the medium in the pilot passage 14 are the same.

[0030] The solenoid valve further includes a fourth elastic member 24 . The fourth elastic member 24 acts on the main valve core 19 . Under the action of the fourth elastic member 24 , the main valve core 19 tends to move toward the main valve seat 25 .

[0031] As shown in Figure 1, when the magnetic actuator loses power and the medium pressure in the pilot channel 14 reaches a threshold, the pilot relief valve needle 12, under the influence of the medium pressure in the pilot channel 14 and the spring force of the third elastic member 18, overcomes the spring force of the first elastic member 16 and moves to the second conduction position. At this point, the medium pressure in the control chamber 13 decreases due to the flow of the medium. This causes the main valve core 19 to lift off the main valve seat 25 under the influence of the medium pressure in the front chamber 23, overcoming the spring force of the fourth elastic member 24 and the medium pressure in the control chamber. This results in the main valve being in the open state. The arrows in Figure 1 indicate the medium flow path when the magnetic actuator loses power and the main valve is open. The medium flows from the front chamber 23 of the main valve through the damping orifice 20 into the control chamber 13, then into the relief channel 15 and the pilot chamber 26. Finally, it flows out of the pilot chamber 26 through the gap between the pilot valve core 11 and the pilot valve seat 27.

[0032] When the medium pressure in the pilot channel 14 is less than a threshold, the first elastic member 16 overcomes the third elastic member 18 and the medium pressure, pushing the pilot relief valve needle 12 to the cut-off position, closing the relief channel 15. At this point, the main valve core 19, under the action of the elastic force of the fourth elastic member 24 and the medium pressure in the control chamber 13, overcomes the medium pressure in the front chamber 23 of the main valve and abuts against the main valve seat 25, closing the main valve.

[0033] As shown in Figure 2, when the magnetic actuator is energized, the pilot relief valve needle 12, under the action of electromagnetic force, overcomes the elastic forces of the second and third elastic members and the medium pressure in the control chamber 13, and moves downward to the first conduction position. At this point, the upper channel of the pilot relief valve needle 12 opens, that is, the overflow channel 15 is open, causing the main valve core 19 to move away from the valve seat, and the main valve is now open. When the magnetic actuator is energized, the medium flows from the front chamber 23 of the main valve through the damping orifice 20 into the control chamber 13, then into the overflow channel 15 and the pilot chamber 26, and then out of the pilot chamber 26.

[0034] The end of the pilot valve core 11 near the pilot relief valve needle 12 is configured as a rod-shaped structure. The rod-shaped structure can extend into the interior of the axial section and abut against the pilot relief valve needle 12. A gap for medium flow is defined between the rod-shaped structure and the side wall of the axial section. The distal end of the rod-shaped structure is configured as a tapered shape that tapers toward the distal end.

[0035] In one embodiment, the overflow channel 15 comprises a radial section and an axial section. Here, the radial section refers to the portion extending along the diameter of the main valve core 19, while the axial section refers to the portion extending axially along the main valve core 19. Both the radial and axial sections are provided on the main valve core 19. One end of the radial section communicates with the control chamber 13 of the solenoid valve, and the other end communicates with the axial section. In this embodiment, as indicated by the arrows in Figure 1, the medium within the control chamber 13 can flow sequentially through the radial and axial sections into the pilot chamber 26 where the second elastic member 16 is located, and then out of the pilot chamber 26, thereby achieving overflow and pressure relief in the control chamber 13.

[0036] In this embodiment, there may be one or more radial segments. When there are multiple radial segments, the multiple radial segments are evenly distributed along the circumferential direction with the axis of the main valve core 19 as the center.

[0037] The pilot channel 14 is in communication with the control chamber 13 . When pressure medium exists in the control chamber 13 , the medium can flow into the pilot channel 14 , thereby achieving control of the pilot relief valve needle 12 .

[0038] In one embodiment, the axial section of the overflow channel 15 is configured as a stepped hole comprising a large diameter section and a small diameter section, and the pilot relief valve needle 12 is configured as a stepped shaft comprising a large diameter section and a small diameter section. The stepped shaft is correspondingly disposed within the stepped hole, and the end surface of the large diameter section of the stepped shaft is capable of sealing the small diameter section of the stepped hole.

[0039] FIG3 is a partial schematic diagram of a solenoid valve according to an embodiment of the present application. As shown in FIG3 , the stepped hole may include a first small diameter section 21 and a first large diameter section 22. The stepped shaft includes a second small diameter section 121, a second large diameter section 122, and a third large diameter section 123. The second large diameter section 122 and the third large diameter section 123 are respectively arranged at opposite ends of the second small diameter section 121. The radial section is connected to the side wall of the first small diameter section 21, and the diameter of the second small diameter section 121 is smaller than the diameter of the first small diameter section 21. When the second large diameter section 122 is located in the first small diameter section 21, the two can form a sealing fit to cut off the overflow channel 15.

[0040] As shown in Figure 1 , when the magnetic actuator is in the de-energized state and the medium pressure in the pilot channel 14 is greater than a threshold, the pilot relief valve needle 12, under the action of the medium pressure in the pilot channel 14 and the elastic force of the third elastic member 18, overcomes the elastic force of the first elastic member 16 and moves upward, causing the second large-diameter section 122 to move into the first large-diameter section 22. In other words, the pilot relief valve needle 12 is pushed upward to the second conducting position, thereby achieving conduction of the relief channel 15.

[0041] In one embodiment, in the second conducting position of the pilot relief valve needle 12, the medium in the control chamber 13 flows through the radial section into the axial section, and then sequentially flows through the gap between the axial section and the second smaller diameter section, and then through the gap between the axial section and the second larger diameter section 122, to the outside of the relief channel 15. In this position, the first elastic member 16 does not abut against the pilot relief valve needle 12 and does not exert any force on the pilot relief valve needle 12.

[0042] When the magnetic actuator is in the power-off state and the medium pressure in the pilot channel 14 is less than the threshold value, the first elastic member 16 overcomes the elastic force of the third elastic member 18 and the medium pressure in the pilot channel 14, pushing the pilot overflow valve needle 12 downward, so that the second large diameter section 122 moves to the position of the first small diameter section 21 (in one embodiment, the port position of the first small diameter section 21), and the second large diameter section 122 and the first small diameter section 21 are sealed and matched, thereby realizing the cutoff of the overflow channel 15.

[0043] As shown in Figure 2, when the magnetic actuator is energized, the pilot valve core 11, under the action of the magnetic actuator, overcomes the elastic forces of the second and third elastic members 17, 18, and the pressure of the medium in the control chamber 13, and moves downward. This pushes the pilot relief valve needle 12 downward, causing the second large-diameter section 122 to move downward to the lower radial position of the relief channel 15. In other words, the pilot relief valve needle 12 is pushed downward to the first conducting position. At this point, the relief channel 15 is open.

[0044] In one embodiment, in the first conducting position of the pilot overflow valve needle 12 , the medium in the control chamber 13 flows into the axial section through the radial section, and then flows out of the overflow channel 15 through the gap between the axial section and the pilot overflow valve needle 12 .

[0045] In one embodiment, one end of the pilot channel 14 is connected to the control chamber 13 of the solenoid valve, and the other end is connected to the first small diameter section 21. The first elastic member 16 is disposed in the first large diameter section 22, and the third elastic member 18 is disposed in the first small diameter section 21.

[0046] In one embodiment, the first elastic member 16, the second elastic member 17 and the third elastic member 18 may be springs. The medium herein may be a gas medium or a liquid medium such as hydraulic oil.

[0047] An embodiment of the present application further provides a shock absorber, comprising the solenoid valve as described in any of the above embodiments.

[0048] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit them. Although the present application has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements do not deviate the essence of the corresponding technical solutions from the spirit and scope of the technical solutions of the embodiments of the present application.

[0049] Reference Signs List

[0050] 11. Pilot valve core; 12. Pilot overflow valve needle; 121. Second small diameter section; 122. Second large diameter section; 123. Third large diameter section; 13. Control chamber; 14. Pilot channel; 15. Overflow channel; 16. First elastic member; 17. Second elastic member; 18. Third elastic member; 19. Main valve core; 20. Damping hole; 21. First small diameter section; 22. First large diameter section; 23. Front chamber; 24. Fourth elastic member; 25. Main valve seat; 26. Pilot chamber; 27. Pilot valve seat.

Claims

1. A solenoid valve for a shock absorber, comprising a main valve core (19), a pilot valve core (11), a pilot overflow valve needle (12), a first elastic member (16), a second elastic member (17) and a magnetic actuator, wherein: The main valve core (19) is provided with an overflow channel (15) and a pilot channel (14), and the overflow channel (15) and the pilot channel (14) are both communicated with the control chamber (13) of the solenoid valve; The pilot overflow valve needle (12) is displaceably arranged in the main valve core (19), and the moving position of the pilot overflow valve needle (12) includes a cut-off position, a first conducting position and a second conducting position. In the cut-off position, the pilot overflow valve needle (12) cuts off the overflow channel (15), and in the first conducting position and the second conducting position, the overflow channel (15) is conducting. The first elastic member (16) and the medium pressure in the pilot channel (14) both act on the pilot overflow valve needle (12), and under the action of the first elastic member (16), the pilot overflow valve needle (12) has a tendency to move from the second conduction position to the cut-off position, and under the action of the medium pressure in the pilot channel (14), the pilot overflow valve needle (12) has a tendency to move from the cut-off position to the second conduction position; The magnetic actuator and the second elastic member (17) act on the pilot valve core (11). When the magnetic actuator is powered on, it pushes the pilot valve core (11) to move so that the pilot valve core (11) pushes the pilot overflow valve needle (12) to move to the first conduction position. Under the action of the second elastic member (17), the pilot valve core (11) has a tendency to move away from the pilot overflow valve needle (12). When the magnetic actuator is powered off and the medium pressure in the pilot channel (14) is greater than a threshold value, the pilot overflow valve needle (12) moves to the second conduction position.

2. The solenoid valve according to claim 1 further comprises a third elastic member (18), wherein the third elastic member (18) acts on the pilot overflow valve needle (12), and the directions of the forces exerted by the third elastic member (18) and the first elastic member (16) on the pilot overflow valve needle (12) are opposite.

3. The solenoid valve according to claim 2, wherein: The overflow channel (15) comprises an axial section and one or more radial sections, wherein the radial section and the axial section are both arranged on the main valve core (19), and one end of the radial section is connected to the control chamber (13), and the other end is connected to the axial section.

4. The solenoid valve according to claim 2, wherein: One end of the pilot valve core (11) close to the pilot overflow valve needle (12) is arranged as a rod-shaped structure, the rod-shaped structure can extend into the interior of the axial section and abut against the pilot overflow valve needle (12), and a gap for medium flow is provided between the rod-shaped structure and the side wall of the axial section.

5. The solenoid valve according to claim 3, wherein: The axial section is configured as a stepped hole including a large diameter section and a small diameter section, the pilot relief valve needle (12) is configured as a stepped shaft including a large diameter section and a small diameter section, the stepped shaft is correspondingly arranged in the stepped hole, and the end face of the large diameter section of the stepped shaft can seal the small diameter section of the stepped hole.

6. The solenoid valve according to claim 5, wherein: The stepped hole comprises a first small diameter section (21) and a first large diameter section (22); The stepped shaft comprises a second small diameter section (121), a second large diameter section (122) and a third large diameter section (123), wherein the second large diameter section (122) and the third large diameter section (123) are respectively arranged at two opposite ends of the second small diameter section (121); The radial section is connected to the side wall of the first small diameter section (21); the diameter of the second small diameter section (121) is smaller than the diameter of the first small diameter section; when the second large diameter section (122) is located in the first small diameter section, the two can form a sealing fit to cut off the overflow channel.

7. The solenoid valve according to claim 5, wherein: One end of the pilot channel (14) is in communication with the control chamber (13), and the other end is in communication with the small diameter section of the axial section.

8. The solenoid valve according to claim 5, wherein: The first elastic member (16) is arranged in the large diameter section of the axial section, and the third elastic member (18) is arranged in the small diameter section of the axial section.

9. The solenoid valve according to claim 3, wherein: The radial segments are arranged in plurality, and the plurality of radial segments are evenly distributed along the circumferential direction with the axial segment as the center.

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

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