An adjustable damping solenoid valve

Abstract

The application provides an adjustable damping electromagnetic valve, which comprises an electromagnetic control assembly and an overflow valve assembly. The overflow valve assembly comprises a valve sleeve and a valve seat which are buckled to each other. A valve core is arranged in the valve sleeve. The valve seat is provided with an oil inlet. An oil outlet is arranged on the valve sleeve. A cavity between the valve sleeve and the valve core constitutes an overflow cavity. The oil outlet is elastically closed by the valve core. The valve sleeve is provided with an upper ball seat and a lower ball seat which are coaxially arranged at a preset distance. A spherical core is arranged between the upper ball seat and the lower ball seat. The design structure is ingenious, and the design of the pilot control structure is optimized. The pilot overflow structure in the prior art which is extremely complex is replaced by the mutual cooperation of the two ball seats, the spherical core and the spring, and the design of the oil cavity and the oil path. In the case of power failure, the electromagnetic valve of the shock absorber provides safety protection for the system, and the technical problems of the existing valve device for damping of the shock absorber, such as complex structure and poor safety, are effectively solved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of valve device, in particular to an adjustable damping electromagnetic valve. BACKGROUND

[0002] Shock absorber is an important part of automobile suspension system, and is a main damping element for dissipating the vibration energy of the road to the vehicle body. The performance of the shock absorber directly affects the performance of the suspension system, and thus affects the ride comfort and handling stability of the vehicle. Ride comfort and handling stability are contradictory to a certain extent. Ride comfort requires the shock absorber to provide a smaller damping force, and handling stability requires the shock absorber to provide a larger damping force. To solve these problems, the shock absorber must have adjustable capability, and the damping force adjustment range must be wide, the response speed must be fast, and most road conditions must be covered. The traditional non-adjustable damping shock absorber cannot meet the needs of people. In recent years, the research and development of adjustable damping shock absorbers are continuously deepening in order to meet the needs of different road conditions.

[0003] The pilot overflow valve structure is a valve device widely used in damping shock absorbers. The opening of the main valve core of the overflow valve is controlled by controlling the pressure of the pilot chamber, and the damping of the shock absorber is adjusted by the amount of overflow oil. The size of the given current is used to control the different pressures of the pilot chamber, and then the size of the opening of the main valve core of the overflow valve is controlled, and then the adjustment of different dampings is realized.

[0004] Although the pilot overflow valve is a relatively mature valve design for shock absorbers, it still has various problems. Specifically, the structure of the current overflow valve is very complex, and the corresponding cost is relatively high. At the same time, there is a lack of safety structure when the control fails. That is, when the valve control circuit fails, the shock absorber controlled by the valve device cannot respond to the failure condition to improve the safety performance of the device in this state. It can be imagined that adding a one-way valve structure may achieve certain safety control requirements, but it will inevitably make the internal structure of the already complex pilot overflow valve more complex, and further increase the cost of using the device.

[0005] In summary, the existing valve device for damping of shock absorbers has the technical problems of complex structure and poor safety. SUMMARY

[0006] The technical problem to be solved by the present application is the technical problem of the existing valve device for damping of shock absorbers.

[0007] To solve the above problems, the adjustable damping electromagnetic valve provided by the application comprises an electromagnetic control assembly and an overflow valve assembly, the overflow valve assembly comprises a valve sleeve and a valve seat that are buckled to each other, a valve core is arranged in the valve sleeve, the valve seat is provided with an oil inlet, the valve sleeve is provided with an oil outlet, a cavity between the valve sleeve and the valve core constitutes an overflow cavity, and the oil outlet is elastically closed by the valve core; the valve sleeve is provided with an upper ball seat and a lower ball seat that are coaxially arranged at a preset distance, a spherical core is arranged between the upper ball seat and the lower ball seat, oil channels are arranged at the central axis positions of the upper ball seat and the lower ball seat, the end faces adjacent to the spherical core of the upper ball seat and the lower ball seat are provided with annular beveled flow-stopping end faces, the flow-stopping end faces are used for abutting and closing the oil channels, a cylindrical pilot valve cavity is arranged in the lower ball seat, the pilot valve cavity is communicated with the overflow cavity, the oil channel of the upper ball seat is communicated with the oil outlet, a pilot spring that pushes the spherical core against the upper ball seat is arranged in the pilot valve cavity, a safety oil channel that penetrates through the thickness direction of the edge position of the upper ball seat is arranged, the safety oil channel is communicated with the oil outlet through a gap oil channel, and the safety oil channel is communicated with the pilot valve cavity through the gap between the upper ball seat and the lower ball seat; the electromagnetic control assembly comprises an output push rod that is coaxial with the oil channels on the upper ball seat and the lower ball seat, the output push rod is used for pushing the spherical core away from the upper ball seat to open the oil channel at the upper ball seat when the electromagnetic control assembly is powered on, and the spherical core abuts against the flow-stopping end face of the upper ball seat when the electromagnetic control assembly is powered off.

[0008] The technical scheme provided by the application optimizes the overall design of the pilot structure in the overflow valve, realizes the control of the oil channel in the pilot valve cavity through the structure of the double-ball-seat and elastic spherical core, and the pilot valve cavity is communicated with the overflow cavity, wherein the pilot control is completed by the two spaced ball seats and the spherical core arranged therein. Specifically, when the electromagnetic control assembly is powered off, the spherical core abuts against the upper ball seat under the elastic force of the pilot spring, and the oil channel of the upper ball seat is closed, at this time, the pilot valve cavity is only communicated with the oil outlet through the safety oil channel, at this time, the pressure in the pilot valve cavity is relatively large, and the pressure in the overflow cavity communicated with the pilot valve cavity is also relatively large, thereby providing a large damping shock absorption, which is the large damping safety protection provided by the valve for the vehicle system when the control line is invalid or the power is off.

[0009] On the other hand, when the electromagnetic control assembly is powered on, the output push rod pushes the spherical core to compress the pilot spring under the action of the electromagnetic force, the spherical core is away from the upper ball seat, and the oil channel at the upper ball seat is opened, at this time, the pilot valve cavity is communicated with the oil outlet through the safety oil channel and the oil channel of the upper ball seat, at this time, the pressure in the pilot valve cavity is relatively small, and the pressure in the overflow cavity is also relatively small, which is the normal working state of the electromagnetic valve.

[0010] Furthermore, by changing the current supplied to the electromagnetic control component, the magnitude of the internal electromagnetic force is altered, which in turn changes the magnitude of the thrust output by the output push rod. The different magnitudes of thrust provided by the output push rod correspond to different compressions of the pilot spring by the spherical core, which also determines the opening of the oil passage connecting the oil outlet through the upper and lower ball seats in the pilot valve chamber. Therefore, the magnitude of the pressure in the pilot valve chamber is determined, which in turn changes the magnitude of the pressure in the overflow chamber. This allows the overflow damping magnitude provided by the entire valve to be controlled by the power supply to the electromagnetic control component, enabling targeted adjustment of the valve damping magnitude according to different application conditions of the solenoid valve.

[0011] The adjustable damping solenoid valve features an ingenious design that optimizes the pilot control structure. By combining two ball seats, a spherical core, and a spring, along with the design of the oil chamber and oil circuit, it replaces the extremely complex pilot overflow structure in existing technologies. Furthermore, it enables the system to provide safety protection through the solenoid valve of the shock absorber in the event of a power failure, effectively solving the technical problems of complex structure and poor safety in existing valve devices used for shock absorber damping.

[0012] As a preferred embodiment, the electromagnetic control assembly includes a coaxially nested housing, a coil, a magnetic sleeve, and an armature. The armature is a hollow cylinder, and one end of the output push rod is accommodated in the hollow portion of the armature. The housing and the outer surface of the valve sleeve are interlocked. This optimizes and simplifies the structure of the electromagnetic control assembly.

[0013] As a preferred embodiment, the lower ball seat includes an integral connecting portion and a pilot cavity portion. The outer periphery of the connecting portion is fixed to the inner periphery of the valve sleeve. The side wall of the pilot cavity portion is provided with a through-hole connecting oil hole, which connects the pilot valve cavity and the overflow cavity. This optimizes the communication between the pilot valve cavity and the overflow cavity, improving the stability of pilot control.

[0014] As a preferred embodiment, the inner circumference of the valve sleeve is provided with an annular stepped surface, and the outer side of the upper ball seat and the outer side of the lower ball seat connection portion are both interference-fitted with the inner circumference of the valve sleeve through the annular stepped surface. This optimizes the assembly design of the valve's internal structure, simplifies assembly, and improves sealing.

[0015] As a preferred embodiment, the valve core is a cylindrical shape with one end closed. The valve core is slidably nested within the valve sleeve. An overflow spring is provided between the inner end face of the valve core and the outer side of the lower ball seat to press the valve core against the inner end face of the valve seat to close the oil outlet. This optimizes the structural design of the overflow section inside the valve and simplifies the internal structure of the valve.

[0016] As a preferred scheme, the inner side surface of the valve core is in the shape of a conical surface with a decreasing inner diameter in the direction from the opening inward, and the end surface of the valve core is provided with an oil inlet throttle hole communicating the overflow cavity and the oil inlet. The structure design of the valve internal overflow part is further optimized to ensure the working effectiveness of the overflow part.

[0017] As a preferred scheme, the sleeve shell is used to fit the inner end surface of the valve sleeve and is provided with an output hole for the end part of the output push rod to pass through, and the opening position of the output hole is provided with a conical surface with a large diameter outside and a small diameter inside. The structure design of the pilot valve cavity communicating the oil outlet is optimized.

[0018] As a preferred scheme, the sleeve shell and the magnetic conducting sleeve are sealed and fixed through welding connection to seal the pilot valve cavity. The structure design of the electromagnetic control assembly is simplified, and the sealing performance of the valve internal cavity is improved. BRIEF DESCRIPTION OF DRAWINGS

[0019] Figure 1 A side sectional structure schematic view of the adjustable damping electromagnetic valve is provided.

[0020] Figure 2 A whole external structure schematic view of the adjustable damping electromagnetic valve is provided.

[0021] Among them, Figure 1 , Figure 2 Among them,

[0022] 1, output push rod; 2, magnetic conducting sleeve; 3, armature; 4, coil; 5, sleeve shell; 6, ball core; 7, safety oil channel; 8, pilot valve cavity; 9, communication oil hole; 10, overflow cavity; 11, valve core; 12, oil outlet; 13, valve seat; 14, oil inlet; 15, oil inlet throttle hole; 16, overflow spring; 17, pilot spring; 18, lower ball seat; 19, upper ball seat; 20, valve sleeve; 21, gap oil channel. DETAILED DESCRIPTION

[0023] The technical solutions of the present application will be described clearly and completely below. Obviously, the described embodiments are part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor fall within the protection scope of the present application.

[0024] Reference Figure 1 , Figure 2 , Figure 1 A side sectional structure schematic view of the adjustable damping electromagnetic valve is provided, Figure 2 A whole external structure schematic view of the adjustable damping electromagnetic valve is provided.

[0025] The adjustable damping electromagnetic valve provided by the embodiment comprises an electromagnetic control assembly and an overflow valve assembly, the overflow valve assembly comprises a valve sleeve 20 and a valve seat 13 which are buckled to each other, the valve sleeve 20 is provided with a valve core 11, the valve seat 13 is provided with an oil inlet 14, the valve sleeve 20 is provided with an oil outlet 12, a cavity between the valve sleeve 20 and the valve core 11 forms an overflow cavity 10, and the oil outlet 12 is elastically closed by the valve core 11; the valve sleeve 20 is provided with an upper ball seat 19 and a lower ball seat 18 which are coaxially arranged at a preset distance, a spherical core 6 is arranged between the upper ball seat 19 and the lower ball seat 18, oil channels are arranged at the central axis positions of the upper ball seat 19 and the lower ball seat 18, the end surfaces of the upper ball seat 19 and the lower ball seat 18 adjacent to the spherical core 6 are provided with annular bevel-shaped flow-stopping end surfaces, the flow-stopping end surfaces are used for abutting and closing the oil channels, the lower ball seat 18 is provided with a cylindrical pilot valve cavity 8, the pilot valve cavity 8 is communicated with the overflow cavity 10, the oil channel of the upper ball seat 19 is communicated with the oil outlet 12, the pilot valve cavity 8 is provided with a pilot spring 17 which pushes the spherical core 6 against the upper ball seat 19, the edge position of the upper ball seat 19 is provided with a safety oil channel 7 which penetrates through the thickness direction of the upper ball seat 19, the safety oil channel 7 is communicated with the oil outlet 12 through a gap oil channel 21, and the safety oil channel 7 is communicated with the pilot valve cavity 8 through the gap between the upper ball seat 19 and the lower ball seat 18; the electromagnetic control assembly comprises an output push rod 1 which is coaxial with the oil channels of the upper ball seat 19 and the lower ball seat 18, the output push rod 1 is used for pushing the spherical core 6 away from the upper ball seat 19 to open the oil channel of the upper ball seat 19 when the electromagnetic control assembly is powered on, and the spherical core 6 is pushed to a disconnecting position by the spherical core 6 and the pilot spring 17 when the electromagnetic control assembly is powered off, and the spherical core 6 abuts against the flow-stopping end surface of the upper ball seat 19.

[0026] It should be noted that the outer peripheral surface and the end surface 20 of the valve sleeve and the inner end surface of the sleeve shell 5 are provided with a gap oil channel 21 which communicates the safety oil channel 7 with the oil outlet 12, the side wall of the gap oil channel 21 is sealed by abutting the valve sleeve and the sleeve shell, the oil outlet position is sealed by the joint device which is communicated with the oil outlet, and the overflow of the valve device in the safety mode is realized by the oil channel structure.

[0027] The technical scheme provided by the present application optimizes the overall design of the pilot structure in the overflow valve, realizes the oil channel control in the pilot valve cavity through the structure of the double-ball-seat and the elastic spherical core, the pilot valve cavity is communicated with the overflow cavity, and the pilot control is completed by the two spaced ball seats and the spherical core in the pilot valve cavity. Specifically, when the electromagnetic control assembly is powered off, the spherical core abuts against the upper ball seat under the elastic force of the pilot spring to close the oil channel of the upper ball seat, at this time, the pilot valve cavity is only communicated with the oil outlet through the safety oil channel, the pressure in the pilot valve cavity is relatively large at this time, the pressure in the overflow cavity which is communicated with the pilot valve cavity is also relatively large, and therefore a large damping is provided, which is the large damping safety protection provided by the valve for the vehicle system when the electromagnetic control assembly is powered off or the control line fails.

[0028] When the electromagnetic control assembly is powered, the output push rod pushes the spherical core to compress the pilot spring under the action of electromagnetic force, the spherical core leaves the upper ball seat, the oil passage in the upper ball seat is opened, at this time the pilot valve cavity is communicated with the oil outlet through the safety oil passage and the oil passage in the upper ball seat, at this time the pressure in the pilot valve cavity is small, and the corresponding overflow cavity pressure is also small, which is the normal working state of the electromagnetic valve.

[0029] Further, by changing the current supplied to the electromagnetic control assembly, the internal electromagnetic force is changed, and the output push rod output is changed. Different push force provided by the output push rod corresponds to different compression amounts of the spherical core to the pilot spring, and also determines the opening of the oil passage in the pilot valve cavity which is communicated with the oil outlet through the upper ball seat and the lower ball seat, thus determining the pressure in the pilot valve cavity, and correspondingly changing the pressure in the overflow cavity. Thus, the size of the overflow damping provided by the whole valve is controlled by the power supply of the electromagnetic control assembly, and the size of the valve damping is adjusted according to the different application situations of the electromagnetic valve.

[0030] The design structure of the adjustable damping electromagnetic valve is ingenious, the design of the pilot control structure is optimized, the pilot overflow structure in the prior art is replaced by the cooperation of the two ball seats, the spherical core and the spring, and the design of the oil cavity and the oil passage, and the safety protection of the system is realized by the electromagnetic valve of the shock absorber in the power-off state, and the technical problems of the existing valve device for damping of the shock absorber, such as complex structure and poor safety, are effectively solved.

[0031] The technical scheme provided by the embodiment is mainly to optimize the structure of the electromagnetic control assembly and simplify the structure design. The electromagnetic control assembly comprises a sleeve 5, a coil 4, a magnetic guide sleeve 2 and an armature 3 which are coaxially arranged and nested. The armature 3 is in a hollow cylindrical shape, one end of an output push rod 1 is accommodated in the hollow part of the armature 3, and the sleeve 5 is buckled with the outer side surface of a valve sleeve 20.

[0032] One end of the sleeve is provided with an inner circumferential surface and is nested at one end of the valve sleeve provided with a pilot valve cavity. The output push rod is nested in the inner circumferential surface of the hollow cylindrical armature. The armature, the magnetic guide sleeve and the coil are coaxially nested and installed. When the coil is powered, the internal armature is driven to move axially to drive the output push rod to feed to push the spherical core.

[0033] The technical scheme provided by the embodiment is mainly to optimize the structure of the pilot valve cavity. The lower ball seat 18 comprises an integral connecting part and a pilot cavity part. The outer periphery of the connecting part is fixed with the inner periphery of the valve sleeve 20. The side wall of the pilot cavity part is provided with a through communication oil hole 9 which communicates the pilot valve cavity 8 and the overflow cavity 10.

[0034] The communication structure between the pilot valve cavity and the overflow cavity is arranged on the side wall of the pilot cavity part of the lower ball seat, the communication structure between the pilot valve cavity and the overflow cavity is arranged outside the linear motion path of the spherical core, the oil flow in the cavity can avoid directly impacting the spherical core, the vibration during valve operation is reduced, and the stability of the pilot control is improved.

[0035] In the technical scheme provided by the embodiment, the inner periphery of the valve sleeve 20 is provided with an annular stepped surface, and the outer side surface of the upper ball seat 19 and the outer side surface of the connecting part of the lower ball seat 18 are both in interference fit with the inner periphery of the valve sleeve 20 through the annular stepped surface. In this way, the circular annular outer periphery surfaces of the upper ball seat and the lower ball seat are in interference fit with the annular stepped surface of the inner periphery of the valve sleeve, the installation mode is simple, the sealing performance of the connection is good, and the mode is suitable for sealing and separating the cavities in the valve.

[0036] The technical scheme provided by the embodiment optimizes the structural design of the overflow part in the valve and simplifies the internal structure of the valve. The valve core 11 is in a closed cylindrical shape at one end, the valve core 11 is slidably nested in the valve sleeve 20, and the overflow spring 16 is arranged between the inner end surface of the valve core 11 and the outer side surface of the lower ball seat 18 to tightly abut the two, so as to tightly abut the inner end surface of the valve seat 13 to close the oil outlet 12.

[0037] In the technical scheme provided by the embodiment, the valve core is in a closed cylindrical structure at one end and is in sliding connection with the valve sleeve. The circumferential side surfaces of the two are matched, and the overflow spring is arranged between the two. The overflow spring is in a compressed state, the outer end surface of the valve core is tightly abutted to the inner end surface of the valve seat through the spring elastic force, oil channel structures are arranged on the mutually matched end surfaces, the structure communicates the oil outlet, when the pressure of the overflow cavity reaches a threshold value, the valve core is driven by the pressure of the overflow cavity to overcome the elastic force of the overflow spring to move, so that the valve core end surface and the valve seat end surface are opened by a certain distance to communicate the overflow cavity with the oil outlet.

[0038] In the technical scheme provided by the embodiment, the shape design of the overflow cavity is optimized. The inner side surface of the valve core 11 is in a conical surface shape with a decreasing inner diameter in the direction from the opening to the inside, and the end surface of the valve core 11 is provided with an oil inlet throttling hole 15 communicating the overflow cavity 10 and the oil inlet 14. The overflow cavity adopts a conical surface structure, so that the force distribution is more uniform when the valve core is subjected to the pressure in the cavity, the impact and vibration during work are reduced, and the smoothness of the overflow structure work is ensured.

[0039] The technical scheme provided by the embodiment is consistent with the principle of the above-mentioned embodiment. The sleeve shell 5 is arranged to tightly fit the inner end surface of the valve sleeve 20 and is provided with an output hole for outputting the end part of the push rod 1 to pass through. The opening position of the output hole is provided with a conical surface with a large diameter outside and a small diameter inside. The structure in the pilot valve cavity is optimized by the conical surface structure design in the cavity, and the working vibration of the valve structure is reduced.

[0040] The technical scheme provided by the embodiment improves the assembly performance and sealing performance of the valve, and in particular, simplifies the structural design of the electromagnetic control assembly. The sleeve 5 and the magnetic conducting sleeve 2 are connected and sealed by welding to seal the pilot valve cavity 8. The sealing is achieved by welding, which reduces the machining requirements for the surface end face of the workpiece, reduces the cost of the parts, and ensures good sealing characteristics.

[0041] Although the present disclosure is disclosed as above, the protection scope of the present disclosure is not limited to this. Those skilled in the art can make various changes and modifications without departing from the spirit and scope of the present disclosure, and these changes and modifications will fall within the protection scope of the present disclosure.

Claims

1. An adjustable damping solenoid valve characterized by, The application relates to an electromagnetic control assembly and an overflow valve assembly, wherein the overflow valve assembly comprises a valve sleeve (20) and a valve seat (13) which are mutually buckled, a valve core (11) is arranged in the valve sleeve (20), the valve seat (13) is provided with an oil inlet (14), an oil outlet (12) is arranged on the valve sleeve (20), a cavity between the valve sleeve (20) and the valve core (11) forms an overflow cavity (10), the oil outlet (12) is elastically closed by the valve core (11), an upper ball seat (19) and a lower ball seat (18) are coaxially arranged in the valve sleeve (20) at a preset distance, a spherical core (6) is arranged between the upper ball seat (19) and the lower ball seat (18), oil channels are arranged at the central axis positions of the upper ball seat (19) and the lower ball seat (18), the end faces of the upper ball seat (19) and the lower ball seat (18) which are adjacent to the spherical core (6) are provided with circular ring inclined flow-stopping end faces, the flow-stopping end faces are used for abutting and closing the oil channels, a cylindrical pilot valve cavity (8) is arranged in the lower ball seat (18), the pilot valve cavity (8) is communicated with the overflow cavity (10), the oil channel of the upper ball seat (19) is communicated with the oil outlet (12), a pilot spring (17) is arranged in the pilot valve cavity (8) and is used for pushing the spherical core (6) against the upper ball seat (19), a safety oil channel (7) is arranged at the edge position of the upper ball seat (19) and penetrates the thickness direction of the upper ball seat (19), the safety oil channel (7) is communicated with the oil outlet (12) through a gap oil channel (21), the safety oil channel (7) is communicated with the pilot valve cavity (8) through the gap between the upper ball seat (19) and the lower ball seat (18); the electromagnetic control assembly comprises an output push rod (1) which is coaxial with the oil channels on the upper ball seat (19) and the lower ball seat (18), the output push rod (1) is used for pushing the spherical core (6) away from the upper ball seat (19) to open the oil channel at the upper ball seat (19) when the electromagnetic control assembly is powered on, and the spherical core (6) and the pilot spring (17) push the output push rod (1) to a disconnecting position when the electromagnetic control assembly is powered off, and the spherical core (6) abuts against the flow-stopping end face of the upper ball seat (19).

2. The adjustable damping solenoid valve of claim 1, wherein The electromagnetic control assembly comprises a sleeve shell (5), a coil (4), a magnetic conducting sleeve (2) and an armature (3) which are coaxially arranged and mutually nested, the armature (3) is in a hollow cylindrical shape, one end of the output push rod (1) is accommodated in the hollow position of the armature (3), and the sleeve shell (5) is mutually buckled with the outer side surface of the valve sleeve (20).

3. The adjustable damping solenoid valve of claim 2, wherein, The lower ball seat (18) comprises an integrated connecting part and a pilot cavity part, the outer periphery of the connecting part is fixed with the inner periphery of the valve sleeve (20), and a through communication oil hole (9) is arranged on the side wall of the pilot cavity part, the communication oil hole (9) communicates the pilot valve cavity (8) and the overflow cavity (10).

4. The adjustable damping solenoid valve of claim 3, wherein The inner periphery of the valve sleeve (20) is provided with an annular stepped surface, the outer side surface of the upper ball seat (19) and the outer side surface of the connecting part of the lower ball seat (18) are all in interference fit with the inner periphery of the valve sleeve (20) through the annular stepped surface.

5. The adjustable damping solenoid valve according to claim 4, characterized in that, The valve core (11) is in a closed cylinder shape at one end, the valve core (11) is slidably nested in the valve sleeve (20), and the inner end surface of the valve core (11) and the outer surface of the lower ball seat (18) are provided with an overflow spring (16) abutting both, for abutting the valve core (11) to the inner end surface of the valve seat (13) to close the oil outlet (12).

6. The adjustable damping solenoid valve of claim 5, wherein, The inner surface of the valve core (11) is in a conical shape with decreasing inner diameter in the direction from the opening inward, and the end surface of the valve core (11) is provided with an oil inlet throttle hole (15) communicating the overflow cavity (10) and the oil inlet (14).

7. The adjustable damping solenoid valve of claim 6, wherein, The sleeve shell (5) is used to fit the inner end surface of the valve sleeve (20) and is provided with an output hole for the end of the output push rod (1) to pass through, and the opening position of the output hole is provided with a conical surface with a large outer diameter and a small inner diameter.

8. The adjustable damping solenoid valve of claim 7, wherein, The sleeve shell (5) and the magnetic guide sleeve (2) are sealed and fixed by welding connection to seal the pilot valve cavity (8).

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