External electromagnetic valve of continuous damping shock absorber

Abstract

The utility model discloses an external electromagnetic valve of a continuous damping shock absorber, which comprises an electromagnetic shell, a main valve sleeve component matched with one end of the electromagnetic shell, a coil component positioned in the electromagnetic shell, and a push rod component at least partially surrounded by the coil component, the main valve sleeve assembly comprises a main valve sleeve provided with a main valve element cavity and a secondary valve element cavity, a main valve element arranged in the main valve element cavity, a valve seat arranged at one end of the main valve element cavity and a secondary valve element which is at least partially axially arranged in the secondary valve element cavity and is driven by the push rod assembly. The electromagnetic valve has the advantages that the internal structure is optimized on the basis that the overall function of the electromagnetic valve is not changed, the number of parts is reduced, a first flow guide channel reed is omitted for control, the overall response time of the electromagnetic valve is kept, meanwhile, the manufacturing cost is reduced, meanwhile, the flow pressure is changed by changing the size of a channel between the secondary valve element and the valve seat, and the electromagnetic valve is convenient to use. Therefore, opening and closing of the main valve element are controlled.

Description

Technical Field

[0001] The utility model relates to the technical field of valves, in particular to an external electromagnetic valve of a continuous damping shock absorber. Background Art

[0002] The suspension structure of existing vehicles typically has fixed spring and shock absorber performance after leaving the factory and cannot be adjusted while driving. Therefore, it lacks the ability to actively adjust the "softness" or "hardness." To address this need for softness or hardness adjustment, adjustable damping electromagnetic shock absorbers have emerged. Existing adjustable damping electromagnetic shock absorbers use damping plates made of special materials and are installed in an integrated manner. This results in high testing and production costs, cumbersome disassembly and replacement, low durability, and poor consistency. Utility Model Content

[0003] In order to solve the above technical problems, the purpose of the present invention is to provide an external solenoid valve for a continuous damping shock absorber, which changes the flow pressure by changing the size of the channel between the secondary valve core and the valve seat, thereby controlling the opening and closing of the main valve core.

[0004] To achieve the purpose of the present invention, the present invention provides the following technical solutions: an external solenoid valve of a continuous damping shock absorber, which includes an electromagnetic shell, a main valve sleeve assembly matched with one end of the electromagnetic shell, a coil assembly located in the electromagnetic shell, and a push rod assembly at least partially surrounded by the coil assembly, wherein the main valve sleeve assembly includes a main valve sleeve having a main valve core cavity and a secondary valve core cavity, a main valve core arranged in the main valve core cavity, a valve seat arranged at one end of the main valve core cavity, and a secondary valve core at least partially axially arranged in the secondary valve core cavity and driven by the push rod assembly, wherein the main valve sleeve is also provided with a plurality of main valve sleeve holes circumferentially arranged outside the main valve core cavity and interconnected and located at one end, a valve sleeve throttling hole connecting the main valve core cavity and the secondary valve core cavity, a main valve sleeve flat portion located on the outside, and a connecting groove connected to the secondary valve core cavity at one end and connected to the main valve sleeve flat portion at the other end.

[0005] On the basis of the above technical solution, the following subsidiary technical solutions are further included:

[0006] The secondary valve core includes a secondary valve core bottom, a secondary valve core middle part located above the secondary valve core bottom, a secondary valve core top located above the secondary valve core middle part, a secondary valve core central channel located in the center, a plurality of secondary valve core flow channels located outside the secondary valve core central channel, and a secondary valve core spring that is sleeved on the outside of the secondary valve core bottom and has one end in contact with the secondary valve core middle part.

[0007] The main valve core includes a valve core cavity located at one end, a valve core throttle hole connected to the other end of the valve core cavity, and a main spring with one end located in the valve core cavity, wherein the valve seat is provided with a valve port connected to the valve core throttle hole.

[0008] It also includes a baffle arranged at one end of the coil assembly, a static iron core arranged at the other end of the coil assembly, a push rod cap sleeved on one end of the push rod assembly, and a magnetic isolation ring sleeved on the outside of the push rod cap.

[0009] The push rod assembly includes a push rod, a push rod cavity located in the push rod, a push rod hole communicated with the push rod cavity, an armature sleeved and fixedly connected to the outside of the push rod, and an armature flat portion located outside the armature.

[0010] The bottom of the secondary valve core is provided with a secondary valve core bottom opening connected to the secondary valve core central channel, and a plurality of secondary valve core bottom channels located outside the secondary valve core central channel.

[0011] The top of the secondary valve core is provided with a secondary valve core top opening which is connected with the secondary valve core central channel and abuts against the push rod, wherein the top opening of the secondary valve core has a step portion abutting against the push rod.

[0012] It also includes a magnetic isolation spring located in the static iron core slot and capable of abutting the armature, a magnetic isolation pad with one end supporting the magnetic isolation spring and the other end arranged on the static iron core, and a bearing that fixes the upper end of the push rod and is covered by the push rod cap.

[0013] It also includes an annular protrusion located at the bottom of the secondary valve core cavity, and an annular inner cavity surrounded by the annular protrusion and connected to the valve sleeve throttle hole, wherein the annular inner cavity accommodates the bottom of the secondary valve core and is connected to the secondary valve core cavity.

[0014] There is a gap between the inner wall of the annular protrusion and the outer wall of the bottom of the secondary valve core, so that the annular inner cavity accommodates the bottom of the secondary valve core and is connected to the secondary valve core cavity.

[0015] Compared with the existing technology, the utility model has the following beneficial effects: it optimizes the internal structure without changing the overall function of the solenoid valve, reduces the number of parts, eliminates the need for pilot flow channel reed control, and reduces manufacturing costs while maintaining the overall response time of the solenoid valve. At the same time, the flow pressure is changed by changing the size of the channel between the secondary valve core and the valve seat, thereby controlling the opening and closing of the main valve core. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] The accompanying drawings are used to provide a further understanding of the present invention and constitute a part of the specification. Together with the embodiments of the present invention, they are used to explain the present invention and do not constitute a limitation of the present invention. In the accompanying drawings:

[0017] Figure 1 It is a three-dimensional diagram of the utility model;

[0018] Figure 2 is a cross-sectional view of the utility model in a first state;

[0019] Figure 3 is a cross-sectional view of the utility model in a second state;

[0020] Figure 4 is a cross-sectional view of the utility model in a third state;

[0021] Figure 5 is a cross-sectional view of the utility model in a fourth state;

[0022] Figure 6 is a cross-sectional view of the utility model in a fifth state;

[0023] Figure 7 It is a three-dimensional diagram of the main valve sleeve in the utility model;

[0024] Figure 8 It is a cross-sectional view of the secondary valve core of the utility model;

[0025] Figure 9 It is a three-dimensional diagram of the push rod assembly in the utility model;

[0026] Figure 10 This is the PQ curve diagram of the entire valve of the utility model;

[0027] Figure 11 It is a displacement curve diagram of the main valve of the utility model. DETAILED DESCRIPTION

[0028] In order to make the technical means, creative features, objectives and effects achieved by the present invention easier to understand, the present invention is further described below in conjunction with specific implementation methods.

[0029] like Figure 1-11 As shown, the present invention provides a specific embodiment of an external solenoid valve for a continuous damping shock absorber, comprising an electromagnetic housing 1000 fixed to a vehicle shock absorber cylinder, a main valve sleeve assembly engaged with one end of the electromagnetic housing 1000, a coil assembly 6000 located within the electromagnetic housing 1000, and a push rod assembly at least partially surrounded by the coil assembly 6000. Thus, this embodiment as a whole comprises an electromagnetic portion and a hydraulic portion, wherein the hydraulic portion includes a primary valve and a secondary valve.

[0030] Solenoid housing 1000 is a roughly hollow cylinder, comprising a coil chamber 1200 at one end, housing the coil assembly 600, and a main valve housing chamber 1400 at the other end, which at least partially houses the main valve housing assembly. Solenoid housing 1000 has a seal near the outside of main valve housing 1400, which seals against the vehicle's shock absorber. The outer surface of solenoid housing 1000 has threads that secure it to the shock absorber. The lower portion of solenoid housing 1000 mates with the hydraulic end.

[0031] The main valve sleeve assembly includes a main valve sleeve 2000 having a main valve core cavity 2100 and a secondary valve core cavity 2300 and at least partially accommodated by the main valve sleeve cavity 1400, a main valve core 3000 arranged in the main valve core cavity 2100, a valve seat 4000 arranged at one end of the main valve core cavity 2100, and a secondary valve core 5000 at least partially axially arranged in the secondary valve core cavity 2300 and driven by the push rod assembly.

[0032] The main valve sleeve 2000 is generally cylindrical and includes a plurality of main valve sleeve holes 2140 circumferentially arranged outside the main valve core cavity 2100 and located at one end; an annular protrusion 2500 located at the bottom of the secondary valve core cavity 2300; an annular inner cavity 2520 surrounded by the annular protrusion 2500 and communicating with the valve sleeve orifice 2400; the valve sleeve orifice 2400 connecting the main valve core cavity 2100 and the secondary valve core cavity 2300; a main valve sleeve flat portion 2600 located outside the secondary valve core cavity 230; a valve sleeve end portion 2700 located at one end; and a connecting groove 2800 located on the valve sleeve end portion 2700, one end of which is connected to the secondary valve core cavity 2300 and the other end to the main valve sleeve flat portion 2600. There is a height difference between the surface of the valve sleeve end portion 2700 and the bottom surface of the connecting groove 2800. A gap exists between the main valve sleeve flattened portion 2600 and the inner wall of the main valve sleeve 2000, and this gap is located within the main valve sleeve cavity 1400. The main valve sleeve hole 2140 circumferentially connects the inlet and outlet of the valve seat 4000. The valve sleeve orifice 2400 serves as a small orifice to establish a flow control channel between the main valve core cavity 2100 and the secondary valve core cavity 2300.

[0033] The main valve core 3000 includes a valve core cavity 3100 at one end, a valve core orifice 3200 communicating with the other end of the valve core cavity 3100, and a main spring 3400 with one end positioned within the valve core cavity 3100. The axial cross-section of the valve core cavity 3100 is roughly trapezoidal, with the cross-sectional area gradually increasing in the direction of flow. The other end of the main spring 3400 rests within the main valve sleeve 2000 and is positioned adjacent to the sleeve orifice 2400.

[0034] The valve seat 4000 is connected to the main valve core 3000 and is provided with a valve port 4200 that is connected to the valve core throttle hole 3200. The cross-sectional area of ​​the valve port 4200 is much larger than the cross-sectional area of ​​the valve core throttle hole 3200. The valve port 4200 is the inlet of the valve seat 4000.

[0035] The secondary valve core 5000 is generally cylindrical and includes a secondary valve core bottom 5100, a secondary valve core middle portion 5200 located above the secondary valve core bottom 5100, a secondary valve core top 5300 located above the secondary valve core middle portion 5200, a secondary valve core central channel 5400 located at the center and extending through the secondary valve core bottom 5100, the secondary valve core middle portion 5200, and the secondary valve core top 5300, a plurality of secondary valve core flow channels 5500 located outside the secondary valve core central channel 5400 and extending through the secondary valve core middle portion 5200 and the secondary valve core top 5300, and a secondary valve core spring 5800 sleeved outside the secondary valve core bottom 5100, with one end abutting against the secondary valve core middle portion 5200. The secondary valve core spring 5800 is further disposed outside the annular protrusion 2500, with its other end contacting the bottom of the secondary valve core cavity 2300. The cross-sectional area of ​​the secondary valve core's middle portion 5200 is smaller than that of the secondary valve core's top portion 5300, but larger than that of the secondary valve core's bottom portion 5100. The secondary valve core's bottom portion 5100 is provided with a secondary valve core bottom opening 5120, which communicates with the secondary valve core's central channel 5400, and a plurality of secondary valve core bottom channels 5140 located outside the secondary valve core's central channel 5400. The secondary valve core's top portion 5300 is provided with a secondary valve core top opening 5320, which communicates with the secondary valve core's central channel 5400 and abuts against the push rod 7000. The secondary valve core top opening 5320 is provided with a stepped portion that abuts against the push rod 7000. A gap exists between the inner wall of the annular protrusion 2500 and the outer wall of the secondary valve core's bottom portion 5100, allowing the annular inner cavity 2520 to accommodate the secondary valve core's bottom portion 5100 and communicate with the secondary valve core cavity 2300.

[0036] This embodiment further includes a baffle 6200 disposed at one end of the coil assembly 6000, a static iron core 6400 disposed at the other end of the coil assembly 6000, a push rod cap 6600 mounted on one end of the push rod assembly, and a magnetic isolation ring 6800 mounted on the outside of the push rod cap 6600. The static iron core 6400 includes a static iron core hole 6420 and a static iron core slot 6440 located at one end.

[0037] The push rod assembly includes a push rod 7000, a push rod cavity 7100 within the push rod 7000, a push rod hole 7120 interconnected with the push rod cavity 7100, an armature 7200 mounted and fixedly connected to the outside of the push rod 7000, and an armature flat portion 7240 located outside the armature 7200. The push rod 7000 is located at the center of the armature 7200 and is surrounded by the coil assembly 6000. One end of the armature 7200 is positioned adjacent to the static iron core groove 6440. The distal end of the push rod 7000 abuts against the secondary valve core 5000. The main valve sleeve 2000, the main valve core 3000, the valve seat 4000, the secondary valve core 5000, and the push rod 7000 are coaxially arranged.

[0038] This embodiment also includes a magnetic isolation spring 7300 located within the static iron core slot 6440 and capable of abutting the armature 7200; a magnetic isolation washer 7400 with one end supporting the magnetic isolation spring 7300 and the other end disposed on the static iron core 6400; and a bearing 7600 that secures the upper end of the push rod 7000 and is covered by a push rod cap 6600. The static iron core hole 6420 secures the lower end of the push rod 7000 while allowing axial movement. The lower surface of the static iron core 6400 mates with the upper surface of the main valve sleeve 2000. The armature 7200 and push rod 7000 are driven by electromagnetic force. The push rod 7000 is supported at both ends by bearings 7600 and the static iron core 6400. As the push rod 7000 reciprocates within the static iron core hole 6420 and the bearing 7600, the push rod hole 7120 is positioned so that part of the hole is always above the magnetic isolation pad 7400. The lower end of the push rod 7000 engages the secondary valve core 5000, pushing the secondary valve core 5000 back and forth. The armature 7200 moves between the magnetic isolation spring 7300 and the bearing 7600. The bearing 7600 is preferably a sliding bearing made of metal, copper, graphite, or other materials.

[0039] The valve sleeve orifice 2400 serves as the primary control channel. A main spring 3400 is located between the main valve core 3000 and the lower surface of the inner circumferential material of the main valve sleeve 2000. A secondary valve core 5000 is housed within the secondary valve core cavity 2300. The lower portion of the secondary valve core 5000's main body is chamfered, creating a gap with the inner wall of the annular protrusion 2500 that serves as a control channel. A circumferentially arranged secondary valve core bottom channel 5140, located above the annular protrusion 2500, is located at the bottom 5100 of the secondary valve core, serving as another control channel. These two control channels work together to balance the electromagnetic force and hydraulic pressure on the secondary valve core 5000, thereby controlling the stable opening of the main valve core 3000 under different current conditions, providing the required flow to the vehicle shock absorber and achieving active control of the vehicle shock absorber's softness and hardness. The middle portion 5200 of the secondary valve core reciprocates within the main valve sleeve 2000. When power is off, the secondary valve core 5000, acting under the force of the secondary valve core spring 5800, contacts the lower surface of the static iron core 6400 in the solenoid head, shutting off the flow and closing the valve port 4200. When power is on, the secondary valve core 5000, pushed downward by the push rod 7000, opens the valve port 4200. This utility model optimizes the internal structure without changing the overall function of the solenoid valve, reduces the number of parts, and eliminates the need for a pilot flow channel reed control. This maintains the overall response time of the solenoid valve while also reducing manufacturing costs.

[0040] Combine Figure 2-6 As shown, the oil circuit of the hydraulic unit changes as follows:

[0041] When the current is 0, Figure 2As shown, when the difference between the pressure P of the valve port 4200 and the pressure in the valve core cavity 3100 is greater than the elastic force of the main spring 3400, the main valve core 3000 is pushed upward, the valve port 4200 is opened as the main valve port, and the oil path enters the main valve sleeve 2000 from the valve port 4200, and then flows out to the outlet through the valve sleeve hole 2140;

[0042] When the current is small (about 0.3A), Figure 3 As shown, the valve core throttle hole 3200 serves as the main throttling. After the coil assembly 6000 is energized, the secondary valve core 5000 moves downward, the connecting groove 2800 opens, and the opening is not large. The flow rate at the gap between the secondary valve core bottom 5100 and the inner wall of the annular protrusion 2500 decreases, and the comprehensive flow rate of the secondary valve core chamber 2300 is not large. The pressure of the secondary valve core chamber 2300 begins to decrease, and the pressure of the valve core inner cavity 3100 also begins to decrease. When the difference between the pressure P of the valve port 4200 and the pressure of the valve core inner cavity 3100 is greater than the elastic force of the main spring 3400, the main valve core 3000 is pushed upward, and the valve port 4200 is opened as the main valve port, with the largest opening. The oil circuit has two main paths: 1 ) Enter the main valve sleeve 2000 from the valve port 4200, and then flow out to the outlet through the valve sleeve hole 2140; 2) Enter the valve core inner cavity 3100 from the valve port 4200 through the valve core throttle hole 3200, and then enter the secondary valve core cavity 2300 through the valve sleeve throttle hole 2400. There are multiple bypass paths in the secondary valve core cavity 2300: a) From the gap between the secondary valve core bottom 5100 and the inner wall of the annular protrusion 2500, first reach the secondary valve core flow channel 5500, and then pass through the connecting groove 2800 to the outlet; b) Enter from the secondary valve core center channel 5400 to the secondary valve core bottom channel 5140, first reach the secondary valve core flow channel 5500, and then pass through the connecting groove 2800 to the outlet.

[0043] At medium current (about 0.6A), if Figure 4As shown, the oil circuit has two main paths: 1) Entering from the valve port 4200 into the main valve sleeve 2000, and then flowing out to the outlet through the valve sleeve hole 2140; 2) Entering from the valve port 4200 into the valve core inner cavity 3100 through the valve core throttle hole 3200, and then entering into the secondary valve core cavity 2300 through the valve sleeve throttle hole 2400, and there are multiple bypass paths in the secondary valve core cavity 2300: a) From the gap between the secondary valve core bottom 5100 and the inner wall of the annular protrusion 2500, first to the secondary valve core flow channel 5500, and then through the connecting groove 2800 to the outlet; b) Entering from the secondary valve core center channel 5400 into the secondary valve core bottom channel 5140, first to the secondary valve core flow channel 5500, and then through the connecting groove 2800 to the outlet. At this time, the connecting groove 2800 serves as the main throttling, and the flow from the gap between the bottom 5100 of the secondary valve core and the inner wall of the annular protrusion 2500 continues to decrease, the flow of the connecting groove 2800 increases, the comprehensive flow of the secondary valve core cavity 2300 increases, and is greater than the flow of the valve core throttling hole 3200. The pressure in the valve core cavity 3100 drops, the opening of the main valve core 3000 slows down, and the opening of the main valve decreases.

[0044] When the current is large (about 1.2A), Figure 5 As shown, the oil circuit has two main paths: 1) from the valve port 4200 into the main valve sleeve 2000, and then out to the outlet through the valve sleeve hole 2140; 2) from the valve port 4200 through the valve core throttle hole 3200 into the valve core inner cavity 3100, and then through the valve sleeve throttle hole 2400 into the secondary valve core cavity 2300, and the secondary valve core cavity 2300 has a single path: from the secondary valve core center channel 5400 into the secondary valve core bottom channel 5140, first to the secondary valve core flow channel 5500, and then through the connecting groove 2800 to the outlet. At this time, the secondary valve core center channel 5400 serves as the main throttling channel, and the secondary valve core bottom 5100 contacts the inner wall of the main valve sleeve 2000. The throttling at the original gap begins to close, the comprehensive flow in the valve core cavity 3100 decreases, and the pressure in the valve core cavity 3100 increases. The main valve core 3000 continues to open slowly, the opening degree decreases, and the pressure of the valve port 4200 slowly rises with the flow inlet.

[0045] At the maximum current (about 1.6A), if Figure 6As shown, the oil circuit has two main paths: 1) from the valve port 4200 into the main valve sleeve 2000, and then out to the outlet through the valve sleeve hole 2140; 2) from the valve port 4200 through the valve core throttle hole 3200 into the valve core inner cavity 3100, and then through the valve sleeve throttle hole 2400 into the secondary valve core cavity 2300, and the secondary valve core cavity 2300 has a single path: from the secondary valve core center channel 5400 into the secondary valve core bottom channel 5140, first to the secondary valve core flow channel 5500, and then through the connecting groove 2800 to the outlet. At this time, the secondary valve core center channel 5400 serves as the main throttling channel, and the secondary valve core bottom 5100 contacts the inner wall of the main valve sleeve 2000. The throttling at the original gap is closed, and the comprehensive flow in the valve core cavity 3100 is the smallest, but the comprehensive throttling area is larger than the throttling area when the current is 0. The main valve core 3000 continues to open slowly, the opening degree decreases, and the pressure of the valve port 4200 rises rapidly with the flow inlet.

[0046] The utility model has the following beneficial effects: the internal structure is optimized without changing the overall function of the solenoid valve, the number of parts is reduced, the use of a pilot flow channel reed control is eliminated, the manufacturing cost is reduced while maintaining the overall response time of the solenoid valve, and at the same time, the flow pressure is changed by changing the size of the channel between the secondary valve core and the valve seat, thereby controlling the opening and closing of the main valve core.

[0047] The above shows and describes the basic principles, main features and advantages of the present invention. Those skilled in the art should understand that the present invention is not limited to the above embodiments. The above embodiments and descriptions are merely illustrative of the principles of the present invention. Various changes and improvements may be made to the present invention without departing from the spirit and scope of the present invention. Such changes and improvements are intended to fall within the scope of the present invention. The scope of protection claimed in this invention is defined by the appended claims and their equivalents.

Claims

1. A continuous damping shock absorber external solenoid valve, comprising: An electromagnetic housing (1000), a main valve sleeve assembly matched with one end of the electromagnetic housing (1000), a coil assembly (6000) located in the electromagnetic housing (1000), and a push rod assembly at least partially surrounded by the coil assembly (6000), wherein the main valve sleeve assembly comprises a main valve sleeve (2000) having a main valve core cavity (2100) and a secondary valve core cavity (2300), a main valve core (3000) disposed in the main valve core cavity (2100), a valve seat (4000) disposed at one end of the main valve core cavity (2100), and at least A secondary valve core (5000) is partially axially arranged in a secondary valve core cavity (2300) and driven by a push rod assembly, wherein the main valve sleeve (2000) is also provided with a plurality of main valve sleeve holes (2140) arranged circumferentially and located at one end, a valve sleeve throttling hole (2400) connecting the main valve core cavity (2100) and the secondary valve core cavity (2300), a main valve sleeve flat portion (2600) located on the outside, and a connecting groove (2800) connected to the secondary valve core cavity (2300) at one end and connected to the main valve sleeve flat portion (2600) at the other end.

2. The continuous damping shock absorber external solenoid valve according to claim 1, characterized in that: The secondary valve core (5000) includes a secondary valve core bottom (5100), a secondary valve core middle portion (5200) located above the secondary valve core bottom (5100), a secondary valve core top (5300) located above the secondary valve core middle portion (5200), a secondary valve core center channel (5400) located in the center, a plurality of secondary valve core flow channels (5500) located outside the secondary valve core center channel (5400), and a secondary valve core spring (5800) which is sleeved on the outside of the secondary valve core bottom (5100) and has one end in contact with the secondary valve core middle portion (5200).

3. The continuous damping shock absorber external solenoid valve according to claim 2, characterized in that: The main valve core (3000) includes a valve core cavity (3100) located at one end, a valve core throttling hole (3200) connected to the other end of the valve core cavity (3100), and a main spring (3400) with one end located in the valve core cavity (3100), wherein the valve seat (4000) is provided with a valve port (4200) connected to the valve core throttling hole (3200).

4. The continuous damping shock absorber external solenoid valve according to claim 3, characterized in that It also includes a baffle (6200) arranged at one end of the coil assembly (6000), a static iron core (6400) arranged at the other end of the coil assembly (6000), a push rod cap (6600) sleeved on one end of the push rod assembly, and a magnetic isolation ring (6800) sleeved on the outside of the push rod cap (6600).

5. The external solenoid valve of a continuous damping shock absorber according to claim 4, characterized in that: The push rod assembly includes a push rod (7000), a push rod cavity (7100) located in the push rod (7000), a push rod hole (7120) interconnected with the push rod cavity (7100), an armature (7200) sleeved on the outside of the push rod (7000) and fixedly connected, and an armature flat portion (7240) located on the outside of the armature (7200).

6. The external solenoid valve of a continuous damping shock absorber according to claim 2, characterized in that: The secondary valve core bottom (5100) is provided with a secondary valve core bottom opening (5120) connected to the secondary valve core central channel (5400), and a plurality of secondary valve core bottom channels (5140) located outside the secondary valve core central channel (5400).

7. The external solenoid valve of a continuous damping shock absorber according to claim 6, characterized in that: The top of the secondary valve core (5300) is provided with a secondary valve core top opening (5320) which is connected to the secondary valve core center channel (5400) and is in abutment with the push rod (7000), wherein the secondary valve core top opening (5320) has a step portion which is in abutment with the push rod (7000).

8. A continuous damping shock absorber external solenoid valve according to any one of the above claims, characterized in that It also includes a magnetic isolation spring (7300) located in the static iron core groove (6440) and capable of abutting against the armature (7200), a magnetic isolation pad (7400) with one end supporting the magnetic isolation spring (7300) and the other end being arranged on the static iron core (6400), and a bearing (7600) fixing the upper end of the push rod (7000) and covered by the push rod cap (6600).

9. A continuous damping shock absorber external solenoid valve according to claim 2 or 3 or 4 or 5 or 6 or 7, characterized in that It also includes an annular protrusion (2500) located at the bottom of the secondary valve core chamber (2300), and an annular inner chamber (2520) surrounded by the annular protrusion (2500) and connected to the valve sleeve throttling hole (2400), wherein the annular inner chamber (2520) accommodates the bottom of the secondary valve core (5100) and is connected to the secondary valve core chamber (2300).

10. The external solenoid valve of a continuous damping shock absorber according to claim 9, characterized in that: There is a gap between the inner wall of the annular protrusion (2500) and the outer wall of the secondary valve core bottom (5100), so that the annular inner cavity (2520) accommodates the secondary valve core bottom (5100) and is connected to the secondary valve core cavity (2300).

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