Electromagnetic valve

Abstract

The electromagnetic valve is applied to a shock absorber, an electromagnetic executing mechanism, a pilot valve assembly, a valve sleeve, a valve seat and a valve element mechanism are arranged in a cylinder, a first oil liquid opening is formed in the valve sleeve, a second oil liquid opening is formed in the valve seat, and the interception area of the first oil liquid opening is changed through sliding of the valve element mechanism; the electromagnetic actuating mechanism comprises a coil, a magnetic conductive tube, a sliding block and an ejector rod, the coil sleeves the magnetic conductive tube, and the magnetic conductive tube is provided with a mounting groove; the highest point of the magnetic conductive tube is higher than that of the coil, and the lowest point of the magnetic conductive tube is lower than that of the coil. The electromagnetic valve has the following advantages that the magnetic conductive pipe can completely cover the range of the coil, the electromagnetic force of the sliding block is kept at a constant value through saturation, the sliding block works stably, the ejector rod works stably, the opening degree of the pilot valve element can be stably controlled, under the condition that the electromagnetic force is constant, the sliding block can move more accurately, and when a shock absorber is adjusted, the electromagnetic force can be adjusted more accurately. And especially for reset of adjustment, the electromagnetic force is constant, and the sliding block can reset accurately.

Description

Technical Field

[0001] The invention relates to the technical field of vehicle suspension vibration reduction devices, and in particular to a solenoid valve. Background Art

[0002] The shock absorber is an important part of the automobile suspension system. It is used to suppress the shock caused by the rebound of the shock-absorbing spring and the impact from the road surface, and plays a role in attenuating the vibration of the frame and body to improve the driving smoothness and handling stability of the car. The shock absorber includes a solenoid valve, which controls the flow of oil in the shock absorber chamber through the solenoid valve, thereby adjusting the damping of the shock absorber to achieve the shock absorption function of the car; in the solenoid valve of the prior art, the pressure of the pilot valve chamber is controlled by adjusting the input current, and then the opening of the main valve core is controlled, thereby adjusting the damping size of the shock absorber.

[0003] In the prior art, for example, Chinese utility model patent CN219317506U discloses a damping adjustable electromagnetic valve for a shock absorber, comprising a valve sleeve, a main valve core, a main valve chamber and a main reset spring, wherein a first check valve and a second check valve are arranged on the main valve core; an oil outlet channel is provided on the valve sleeve, a housing is arranged on the upper end of the valve sleeve, an oil outlet gap is left between the bottom of the housing and the top of the valve sleeve, and a third check valve and a fourth check valve are arranged on the valve sleeve; a pilot valve for connecting the oil outlet channel is arranged in the main valve chamber, and an electromagnetic drive assembly for driving the pilot valve to operate is arranged on the housing, during compression, the oil first passes through the first check valve to enter the pilot valve, and then opens the main valve core; during recovery, the oil first passes through the second check valve and then enters the pilot valve, and then opens the main valve core. However, the magnetic conductive tube in its electromagnetic drive assembly does not completely cover the coil range, so that the electromagnetic force on the slider at different positions may be different, which affects the movement accuracy of the slider and makes the performance of its electromagnetic drive assembly poor. Summary of the invention

[0004] An object of the present application is to provide a solenoid valve with a good electromagnetic actuator performance.

[0005] The technical solution adopted in the present application is: a solenoid valve, applied to a shock absorber, comprising an electromagnetic actuator, a pilot valve assembly, a valve sleeve, a main valve seat and a valve core mechanism, wherein the electromagnetic actuator, the pilot valve assembly, the valve sleeve, the main valve seat and the valve core mechanism are all located in a cylinder, the valve sleeve and the main valve seat are interlocked, the valve sleeve is connected to the cylinder, a first oil port is provided on the valve sleeve, a second oil port is provided on the main valve seat, the valve core mechanism is arranged in the valve sleeve, the first oil port changes the interception area through the sliding of the valve core mechanism, the pilot valve assembly is arranged on the top of the valve core mechanism, and the electromagnetic actuator is arranged on the top of the pilot valve assembly; the electromagnetic actuator comprises a coil, a magnetic tube, a slider and a push rod, the magnetic tube is cylindrical, the coil sleeve is arranged on the magnetic tube, the bottom of the magnetic tube is provided with an inwardly recessed mounting groove, and the slider can be slidably penetrated in the mounting groove; the lower end of the slider is connected to the upper end of the push rod; the highest point of the magnetic tube is higher than the highest point of the coil, and the lowest point of the magnetic tube is lower than the lowest point of the coil.

[0006] Compared with the prior art, the advantage of the present application is that the magnetic tube can completely cover the range of the coil, and through saturation, the electromagnetic force of the slider is kept at a constant value at different positions, so that the slider works stably, and then the push rod works stably, and the opening of the pilot valve core can be stably controlled. Under the constant electromagnetic force, the movement of the slider can be more precise. When the user adjusts the shock absorber, the adjustment accuracy can be guaranteed, especially for the resetting of the adjustment, the electromagnetic force is constant, and the slider works stably.

[0007] In addition, in the present invention, the electromagnetic actuator, the pilot valve assembly, the valve sleeve, the main valve seat and the valve core mechanism are all located in the cylinder, wherein the cylinder can be a shock absorber cylinder.

[0008] In some embodiments of the present application, a first through hole is provided in the center of the slider.

[0009] Furthermore, a magnetic isolation plate is provided at the upper end of the slider, and the magnetic isolation plate is connected to the top of the slider.

[0010] Furthermore, a first boss extending downward is provided at the center of the magnetic isolation plate, and an outer wall surface of the first boss cooperates with the first through hole.

[0011] Furthermore, a second through hole is provided on the first boss, and the second through hole connects the first through hole and the top of the magnetic isolation plate.

[0012] Furthermore, the magnetic isolation plate is provided with a second boss extending upward.

[0013] Furthermore, the top surface of the second boss is an arc surface.

[0014] Furthermore, a first groove which is concave toward the center is provided on the edge of the magnetic isolation plate.

[0015] Furthermore, the first through hole includes an upper section and a lower section, and the upper section and the lower section are connected by a step surface.

[0016] Furthermore, the diameter of the lower section is greater than the diameter of the upper section.

[0017] Furthermore, the top of the push rod is arranged on the lower section.

[0018] Furthermore, a gap is provided between part of the push rod and the hole wall of the lower section.

[0019] In some embodiments of the present application, a partition is provided between the groove wall of the mounting groove and the sliding block.

[0020] In some embodiments of the present application, a conical groove is provided on the side surface of the magnetic conductive tube.

[0021] Furthermore, the projection of the tapered groove on the vertical plane coincides with the projection of the coil on the vertical plane.

[0022] In some embodiments of the present application, the pilot valve assembly includes a pilot valve core, a pilot valve seat and a pilot spring, the pilot spring is located between the pilot valve core and the pilot valve seat; the pilot valve seat includes an upper valve seat and a lower valve seat, the upper valve seat is provided with an oil inlet chamber, the lower valve seat is arranged on the oil inlet chamber, the lower valve seat is provided with an oil inlet hole, and the upper valve seat and the lower valve seat are detachably connected; the pilot valve core is provided with an adjusting column and an oil outlet hole, the adjusting column can move axially with the pilot valve core to change the flow rate of the oil inlet chamber; a guide chamber is provided between the adjusting column and the oil inlet chamber, the guide chamber is respectively connected to the oil inlet chamber and the oil outlet hole; the oil inlet hole is connected to the oil inlet chamber.

[0023] Furthermore, there are at least two oil inlet holes.

[0024] Furthermore, the oil inlet holes are evenly distributed around the center of the lower valve seat.

[0025] Furthermore, the oil inlet cavity includes a circular hole section and a tapered hole section from top to bottom, the bottom of the circular hole section and the top of the tapered hole section are connected by an arc transition, and the cross-sectional area of ​​the tapered hole section gradually increases from top to bottom.

[0026] Furthermore, the diameter of the circular hole segment is not greater than the top diameter of the conical hole segment.

[0027] Furthermore, a mounting section is provided below the tapered hole section, and the mounting section is used for mounting the lower valve seat.

[0028] Furthermore, a limiting surface for blocking the lower valve seat is provided between the mounting section and the tapered hole section.

[0029] Furthermore, the projection of the oil inlet hole on the horizontal plane is arranged inside the projection of the bottom edge of the tapered hole section on the horizontal plane.

[0030] Furthermore, the upper valve seat includes a first ring, a second ring and a third ring, the inner diameter of the first ring is larger than the outer diameter of the third ring, the second ring is arranged between the first ring and the third ring, and the lower part of the first ring is connected to the upper part of the third ring through the second ring.

[0031] Furthermore, the oil inlet chamber is arranged on the third ring.

[0032] Furthermore, the top surface of the third ring member is higher than the top surface of the second ring member.

[0033] Furthermore, the top surface of the third ring member is lower than the top surface of the first ring member.

[0034] Furthermore, the outer diameter surface of the first ring member and the top surface of the first ring member are transitioned by chamfering.

[0035] Furthermore, a first convex ring extending downward is provided on the bottom surface of the first ring member, and the top surface of the first convex ring is connected to and flush with the bottom surface of the second ring member.

[0036] Furthermore, a second convex ring extending upward is provided on the top surface of the first ring member, and the inner diameter of the second convex ring is the same as the inner diameter of the first ring member.

[0037] Furthermore, a first annular groove recessed toward the center is provided on the outer diameter surface of the second convex ring.

[0038] Furthermore, the lower side wall of the first annular groove is connected to the top surface of the first ring member.

[0039] Furthermore, the upper side wall of the first annular groove is an inclined surface; and the bottom surface of the first annular groove is an arc surface.

[0040] Furthermore, the direction of oil inlet and outlet on the upper and lower sides of the pilot valve seat is axial.

[0041] Furthermore, the pilot valve core includes an upper valve core, a lower valve core, and a first oil circuit channel connecting the inner and outer sides of the pilot valve core. The lower valve core can move axially relative to the upper valve core. The first oil circuit channel is arranged between the upper valve core or the lower valve core or the upper valve core and the lower valve core. When the upper valve core and the lower valve core are in abutment with each other, the first oil circuit channel is a passage.

[0042] Furthermore, a clearance oil passage is provided on the valve sleeve, the clearance oil passage is communicated with the first oil port, and the first oil passage is communicated with the clearance oil passage.

[0043] Furthermore, the upper valve core includes a fourth ring member and a fifth ring member from bottom to top, and the top of the fourth ring member is connected to the bottom of the fifth ring member.

[0044] Furthermore, the outer diameter of the fourth ring is greater than the outer diameter of the fifth ring.

[0045] Furthermore, the inner diameter of the fourth ring member is the same as the inner diameter of the fifth ring member.

[0046] Furthermore, the lower valve core includes a support seat, a second groove is provided on the bottom surface of the support seat, and the upper end of the regulating column is connected to the bottom surface of the second groove.

[0047] Furthermore, the oil outlet hole is arranged on the support seat.

[0048] Furthermore, there are at least two oil outlet holes.

[0049] Furthermore, the adjustment column is arranged at the center of the support seat.

[0050] Furthermore, the bottom surface of the adjusting column is provided with an inwardly recessed buffer groove.

[0051] Furthermore, the buffer groove is coaxial with the oil inlet cavity.

[0052] Furthermore, the buffer groove and the bottom surface of the adjustment column are transitioned by chamfering.

[0053] Furthermore, the oil outlet holes are evenly distributed around the center of the support seat.

[0054] Furthermore, the projection of the oil outlet on the horizontal plane partially overlaps with the projection of the fourth ring on the horizontal plane.

[0055] Furthermore, the area of ​​the overlapping portion of the projection of the oil outlet hole and the fourth ring member on the horizontal plane is greater than half of the projection area of ​​the oil outlet hole on the horizontal plane.

[0056] Furthermore, the side wall of the second groove is in a step shape, and the diameter of the lower end of the second groove is greater than the diameter of the upper end of the second groove.

[0057] Furthermore, the second groove and the bottom surface of the support seat are transitioned by chamfering.

[0058] Furthermore, adjacent steps on the side wall of the second groove are transitioned by a slope.

[0059] Furthermore, a second annular groove is provided on the bottom surface of the second groove, and an outer side wall of the second annular groove is connected to a side wall of the second groove.

[0060] Furthermore, the inner side wall of the second annular groove is an inclined surface.

[0061] Furthermore, the bottom surface of the second annular groove is an arc surface.

[0062] Furthermore, at least two grooves are provided between the upper valve core and the lower valve core, and a first oil path is formed between adjacent grooves.

[0063] Furthermore, the groove platform is obtained by milling a protrusion at one end of the lower valve core.

[0064] Furthermore, the trough platform is in a wedge shape with a higher outer side and a lower inner side.

[0065] Furthermore, the projection of the upper valve core on the horizontal plane completely covers the projection of the trough platform on the horizontal plane.

[0066] In some embodiments of the present application, the valve core mechanism includes a main valve core and a main spring, the main spring is arranged between the main valve core and the pilot valve assembly, the main valve core can move axially relative to the valve sleeve, and the main valve core is provided with a feedback chamber and a second channel, the feedback chamber is arranged on one end face of the main valve core, one end of the second channel is connected to the feedback chamber, and the other end is connected to the second oil port.

[0067] Furthermore, an annular spring is provided between the main spring and the pilot valve assembly, and the elastic force of the spring is smaller than the elastic force of the main spring.

[0068] In some embodiments of the present application, an upper sealing cover and a fixing ring are provided on the top of the cylinder. The cross-section of the fixing ring is L-shaped as a whole after being rotated 180°. A fixing groove recessed toward the center is provided on the outer surface of the cylinder. The horizontal side of the fixing ring abuts against the upper sealing cover, and part of the vertical side of the fixing ring is embedded in the fixing groove.

[0069] Furthermore, a lower sealing cover is provided at the lower part of the cylinder, and the valve sleeve is connected to the cylinder through the lower sealing cover.

[0070] Furthermore, the lower sealing cover is annular as a whole.

[0071] Furthermore, a first thread is provided on the inner side surface of the cylinder, and a second thread is provided on the outer diameter surface of the lower sealing cover, and the first thread and the second thread cooperate with each other.

[0072] The solenoid valve obtained by the present invention has the following advantages: the electromagnetic actuator works stably and the slider moves with high precision, so that the solenoid valve can be adjusted accurately; the pilot valve seat has a simple structure, is easy to process and has low cost; the upper valve core can compress the pilot spring between the lower valve core and the pilot valve seat, thereby adjusting the preload force of the pilot spring; the design of the first oil circuit channel enables the oil to flow through the first oil circuit channel when the lower valve core is not subjected to the force of the push rod on the electric drive component, thereby improving stability. BRIEF DESCRIPTION OF THE DRAWINGS

[0073] Figure 1 is a schematic structural diagram of Embodiment 1 of the present invention;

[0074] Figure 2 yes Figure 1 A magnified view of part A in FIG.

[0075] Figure 3 yes Figure 1A magnified view of part B in FIG.

[0076] Figure 4 1 is a schematic structural diagram of a magnetic isolation plate according to Embodiment 1 of the present invention;

[0077] Figure 5 is a schematic structural diagram of a magnetic conductive tube according to Embodiment 1 of the present invention;

[0078] Figure 6 is a schematic structural diagram of a pilot valve assembly according to Embodiment 1 of the present invention;

[0079] Figure 7 is a cross-sectional view of a pilot valve seat according to Embodiment 1 of the present invention;

[0080] Figure 8 The structure of the pilot valve seat of the first embodiment of the present invention is shown in FIG. Figure 1 ;

[0081] Fig. 9 The structure of the pilot valve seat of the first embodiment of the present invention is shown in FIG. Figure 2 ;

[0082] Fig.10 Schematic diagram of the structure of the pilot valve core of Example 1 of the present invention;

[0083] Fig.11 is a cross-sectional view of a pilot valve core according to Embodiment 1 of the present invention;

[0084] Fig.12 It is a schematic structural diagram of the lower valve core of Example 1 of the present invention.

[0085] In the figure: 1, pilot valve core; 11, upper valve core; 111, fourth ring; 112, fifth ring; 12, lower valve core; 121, groove platform; 122, first oil passage; 123, support seat; 124, adjustment column; 125, second groove; 1251, second annular groove; 126, oil outlet hole; 127, buffer groove; 2, pilot valve seat; 21, upper valve seat; 211, first ring; 2111, first convex ring; 2112, second convex ring; 2113, first annular groove; 212, second ring member; 213, third ring member; 22, lower valve seat; 221, oil inlet hole; 23, oil inlet cavity; 231, circular hole section; 232, conical hole section; 233, mounting section; 234, limit surface; 24, guide cavity; 3, electromagnetic actuator; 31, push rod; 311, gap; 312, plane; 32, coil; 33, magnetic tube ; 331, mounting groove; 332, third boss; 333, tapered groove; 334, third convex ring; 34, slider; 341, first through hole; 3411, upper section; 3412, lower section; 3413, step surface; 35, magnetic isolation plate; 351, first boss; 352, second through hole; 353, second boss; 354, first groove; 36, partition; 4, pilot spring; 5, cylinder; 51, upper sealing cover; 5 11. Limit groove; 52. Lower sealing cover; 521. Second thread; 522. Third groove; 53. Fixed ring; 54. Fixed groove; 55. First thread; 6. Valve sleeve; 61. First oil port; 62. Clearance oil channel; 7. Main valve seat; 71. Second oil port; 8. Valve core mechanism; 81. Main valve core; 811. Feedback chamber; 812. Second channel; 82. Main spring; 83. Spring piece; 0. Pilot valve assembly. DETAILED DESCRIPTION

[0086] In order to further explain the technical means and effects adopted by the present invention to achieve the predetermined invention purpose, the specific implementation mode, structure, characteristics and effects of the present invention are described in detail below in combination with the accompanying drawings and preferred embodiments.

[0087] Embodiment 1:

[0088] This embodiment provides a solenoid valve, such as Figure 1As shown, it is applied to a shock absorber 5, comprising an electromagnetic actuator 3, a pilot valve assembly 0, a valve sleeve 6, a main valve seat 7 and a valve core mechanism 8, wherein the electromagnetic actuator 3, the pilot valve assembly 0, the valve sleeve 6, the main valve seat 7 and the valve core mechanism 8 are all located in a cylinder 5, the valve sleeve 6 and the main valve seat 7 are buckled with each other, the valve sleeve 6 is connected to the cylinder 5, a first oil port 61 is provided on the valve sleeve 6, a second oil port 71 is provided on the main valve seat 7, the valve core mechanism 8 is arranged in the valve sleeve 6, the first oil port 61 changes the interception area through the sliding of the valve core mechanism 8, and the pilot valve assembly 0 is arranged in the valve core mechanism The electromagnetic actuator 3 is arranged on the top of the pilot valve assembly 0; the electromagnetic actuator 3 includes a coil 32, a magnetic tube 33, a slider 34 and a push rod 31, the magnetic tube 33 is cylindrical, the coil 32 is sleeved on the magnetic tube 33, the bottom of the magnetic tube 33 is provided with an inwardly recessed mounting groove 331, and the slider 34 is slidably penetrated in the mounting groove 331; the lower end of the slider 34 is connected to the upper end of the push rod 31; the highest point of the magnetic tube 33 is higher than the highest point of the coil 32, and the lowest point of the magnetic tube 33 is lower than the lowest point of the coil 32.

[0089] The magnetic tube 33 can completely cover the range of the coil 32. Through saturation, the electromagnetic force of the slider 34 is kept at a constant value at different positions, so that the slider 34 works stably, and then the push rod 31 works stably. When the electromagnetic force is constant, the movement of the slider 34 can be more precise. When the user adjusts the shock absorber, the adjustment accuracy can be guaranteed, especially for the resetting of the adjustment. The electromagnetic force is constant, and the slider 34 can be accurately reset, thereby improving the user experience.

[0090] In order to ensure reliable movement of the slider 34, Figure 2 As shown, a first through hole 341 is provided at the center of the slider 34; a magnetic isolation plate 35 is provided at the upper end of the slider 34, and the magnetic isolation plate 35 is connected to the top of the slider 34. The first through hole 341 is used to connect the upper and lower sides of the slider 34, which is convenient for the flow of oil, can balance the upper and lower pressures of the slider 34, and is convenient for the movement of the slider 34; the design of the magnetic isolation plate 35 prevents the slider 34 from being sucked.

[0091] In order to ensure the reliability of the structure of the magnetic isolation plate 35, a first boss 351 extending downward is provided at the center of the magnetic isolation plate 35, and the outer wall surface of the first boss 351 cooperates with the first through hole 341; a second through hole 352 is provided on the first boss 351, and the second through hole 352 connects the first through hole 341 with the top of the magnetic isolation plate 35. In this embodiment, the magnetic isolation plate 35 is made of a material that will not be attracted by magnetic force. The design of the first boss 351 improves the structural strength of the magnetic isolation plate 35, and the first boss 351 cooperates with the first through hole 341 to facilitate the connection between the magnetic isolation plate 35 and the slider 34; the second through hole 352 can connect the upper and lower parts, and can also play a damping role.

[0092] In order to ensure reliable oil flow, Figure 4As shown, the magnetic isolation plate 35 is provided with a second boss 353 extending upward; the top surface of the second boss 353 is an arc surface; the edge of the magnetic isolation plate 35 is provided with a first groove 354 recessed toward the center. The design of the second boss 353 improves the structural strength of the magnetic isolation plate 35, and the magnetic isolation plate 35 is more stable when it abuts against the bottom of the mounting groove 331. At the same time, when the magnetic isolation plate 35 abuts against the bottom of the mounting groove 331, a gap can be left between the bottom of the mounting groove 331 and the magnetic isolation plate 35, which is convenient for oil flow; the top surface of the second boss 353 is an arc surface, which can reduce the resistance between the magnetic isolation plate 35 and the oil during movement; the design of the first groove 354 can reduce the material used for the magnetic isolation plate 35, reduce the weight, and facilitate molding.

[0093] In order to ensure the reliability of the first through hole 341, Figure 3 As shown, the first through hole 341 includes an upper section 3411 and a lower section 3412, and the upper section 3411 and the lower section 3412 are connected by a step surface 3413; the diameter of the lower section 3412 is larger than the diameter of the upper section 3411; the top of the push rod 31 is set on the lower section 3412; a gap 311 is provided between part of the push rod 31 and the hole wall of the lower section 3412. Specifically, the push rod 31 is cylindrical as a whole, and a plane 312 is provided on the side, and a gap 311 is formed between the plane 312 and the hole wall of the lower section 3412; the push rod 31 and the lower section 3412 are interference fit. The design of the step surface 3413 can limit the deepest installation distance of the push rod 31; the gap 311 can make the upper end 3411 communicate with the bottom of the slider 34, so that the oil on both sides can be balanced.

[0094] In order to ensure reliable sliding of the slider 34, a partition 36 is provided between the groove wall of the mounting groove 331 and the slider 34. The design of the partition 36 can make the slider 34 slide more smoothly.

[0095] like Figure 5 As shown, a conical groove 333 is provided on the side surface of the magnetic conductive tube 33; the projection of the conical groove 333 on the vertical plane coincides with the projection of the coil 32 on the vertical plane.

[0096] In order to ensure the reliability of the pilot valve assembly 0 structure, Figure 6 , Figure 7As shown, the pilot valve assembly 0 includes a pilot valve core 1, a pilot valve seat 2 and a pilot spring 4, and the pilot spring 4 is located between the pilot valve core 1 and the pilot valve seat 2; specifically, the upper end of the pilot spring 4 abuts against the pilot valve core 1, and the lower end of the pilot spring 4 abuts against the pilot valve seat 2. When the pilot valve core 1 is subjected to the force of the push rod 31 on the electromagnetic actuator 3, the pilot valve core 1 moves downward to compress the pilot spring 4, so that the pilot spring 4 generates a reaction force. When the force applied by the push rod 31 to the pilot valve core 1 disappears, under the action of the pilot spring 4, the pilot valve core 1 moves upward and resets, so that the pilot valve core 1 can move up and down in the axial direction relative to the pilot valve seat 2; and the pilot spring 4 has the function of absorbing vibration and buffering, which can make the push rod 31 relatively stable when pushing the pilot valve core 1 downward.

[0097] The pilot valve seat 2 includes an upper valve seat 21 and a lower valve seat 22. The upper valve seat 21 is provided with an oil inlet cavity 23, the lower valve seat 22 is arranged on the oil inlet cavity 23, and the lower valve seat 22 is provided with an oil inlet hole 221. The upper valve seat 21 and the lower valve seat 22 are detachably connected. Compared with the overall structure, the design of the upper valve seat 21 and the lower valve seat 22 are separated. After the separation, the key dimensions that need to be controlled are fewer, and the parts are easy to process, which reduces the cost. At the same time, the lower valve seat 22 can be disassembled and replaced, which is convenient for only replacing the lower valve seat 22 when the oil inlet hole 221 is blocked, thereby reducing the maintenance cost; at the same time, the size and number of the oil inlet holes 221 can be adjusted by replacing the lower valve seat 22 with oil inlet holes 221 of different specifications, or the oil inlet holes 221 can be further processed by removing the lower valve seat 22. In this embodiment, an interference fit is adopted between the upper valve seat 21 and the lower valve seat 22.

[0098] The pilot valve core 1 is provided with an adjusting column 124 and an oil outlet hole 126. The adjusting column 124 can move axially with the pilot valve core 1 to change the flow rate of the oil inlet chamber 23. A guide chamber 24 is provided between the adjusting column 124 and the oil inlet chamber 23. The guide chamber 24 is connected to the oil inlet chamber 23 and the oil outlet hole 126 respectively. The oil inlet hole 221 is connected to the oil inlet chamber 23. The adjusting column 124 is directly above the oil inlet chamber 23. The adjusting column 124 is coaxial with the oil inlet chamber 23. When the oil enters the oil inlet chamber 23, it will first collide with the adjusting column 124. The blocked oil will diffuse outward into the guide chamber 24, and the guide chamber 24 will guide the oil to move toward the pilot valve core 1, and then flow out from the oil outlet hole 126. There are few bends in the oil flow process, so that the flow of the oil is stable and smooth.

[0099] In order to ensure reliable oil supply, Fig. 9 As shown, there are at least two oil inlet holes 221, and the oil inlet holes 221 are evenly distributed around the center of the lower valve seat 22. In this embodiment, there are three oil inlet holes 221.

[0100] In order to ensure reliable oil inlet, the oil inlet chamber 23 includes a circular hole section 231 and a tapered hole section 232 from top to bottom, the bottom of the circular hole section 231 and the top of the tapered hole section 232 are connected by a circular arc transition, and the cross-sectional area of ​​the tapered hole section 232 gradually increases from top to bottom; the diameter of the circular hole section 231 is not greater than the top diameter of the tapered hole section 232. The tapered hole section 232 can easily concentrate the oil, and the gradually decreasing hole diameter can increase the oil flow rate.

[0101] In order to ensure reliable installation of the lower valve seat 22, a mounting section 233 is provided below the tapered hole section 232, and the mounting section 233 is used for installing the lower valve seat 22; a limiting surface 234 for blocking the lower valve seat 22 is provided between the mounting section 233 and the tapered hole section 232. The lower valve seat 22 cooperates with the mounting section 233. In this embodiment, the lower valve seat 22 is cylindrical, and the mounting section 233 cooperates to form a circular hole; the bottom surface of the lower valve seat 22 is flush with the bottom surface of the third ring member 213, reducing the steps and making the oil flow more stable.

[0102] In order to ensure reliable oil inflow, the projection of the oil inlet hole 221 on the horizontal plane is arranged on the inner side of the projection of the bottom edge of the tapered hole section 232 on the horizontal plane. The outermost part of the oil entering from the oil inlet hole 221 can flow upward along the tapered hole section 232 without impacting the mounting section 233, thereby ensuring the stability of the oil flow.

[0103] In order to ensure the reliability of the structure of the upper valve seat 21, Figure 8 As shown, the upper valve seat 21 includes a first ring 211, a second ring 212 and a third ring 213. The inner diameter of the first ring 211 is larger than the outer diameter of the third ring 213. The second ring 212 is arranged between the first ring 211 and the third ring 213. The lower part of the first ring 211 is connected to the upper part of the third ring 213 through the second ring 212. The oil inlet cavity 23 is arranged on the third ring 213. Specifically, the inner diameter surface of the first ring 211 is connected to the outer diameter surface of the second ring 212, and the inner diameter surface of the second ring 212 is connected to the outer diameter surface of the third ring 213. The inner diameter of the first ring 211 is larger than the diameter of the adjusting column 124. The first ring 211 is used for the installation of the upper valve seat 21 and the outside world. The guide cavity 24 is formed by the second ring 212 connecting the first ring 211 and the third ring 213.

[0104] In order to ensure the reliability of the structure of the upper valve seat 21, the top surface of the third ring member 213 is higher than the top surface of the second ring member 212, which can make the connection strength between the two higher; the top surface of the third ring member 213 is lower than the top surface of the first ring member 211, and the oil coming out of the oil inlet chamber 23 will be blocked by the adjusting column 124, so that the oil flows outward, and the top surface of the first ring member 211 is high, which can make the oil flow outward and then flow upward along the inner diameter surface of the first ring member 211, ensuring the guidance of the oil flow; the outer diameter surface of the first ring member 211 and the top surface of the first ring member 211 are transitioned by chamfering, and the chamfering transition can facilitate the installation of the first ring member 211 and the outside world.

[0105] In order to improve the strength, a first convex ring 2111 extending downward is provided on the bottom surface of the first ring 211, and the top surface of the first convex ring 2111 is connected and flush with the bottom surface of the second ring 212. The design of the first convex ring 2111 enhances the connection strength between the first ring 211 and the second ring 212; the top surface of the first convex ring 2111 and the bottom surface of the second ring 212 can reduce the step surface and reduce the resistance of the oil flow.

[0106] In order to improve the guiding performance, a second convex ring 2112 extending upward is provided on the top surface of the first ring 211, and the inner diameter of the second convex ring 2112 is the same as the inner diameter of the first ring 211; a first annular groove 2113 concave toward the center is provided on the outer diameter surface of the second convex ring 2112; the lower side wall of the first annular groove 2113 is connected to the top surface of the first ring 211; the upper side wall of the first annular groove 2113 is an inclined surface; the bottom surface of the first annular groove 2113 is an arc surface. The outer diameter of the first convex ring 2111 is greater than the outer diameter of the second convex ring 2112. The design of the second convex ring 2112 extends the guiding distance of the oil. After the oil flows along the inner diameter surface of the first ring 211, it will continue to flow along the inner diameter surface of the second convex ring 2112 to ensure the stability of the oil flow. The second convex ring 2112 and the first ring 211 have the same inner diameter, which can reduce the step surface and improve the stability of the oil flow. The design of the first annular groove 2113 can facilitate the installation of the pilot spring 4. The top surface of the second convex ring 2112 is higher than the bottom surface of the adjustment column 124.

[0107] In order to make the oil flow more stable, the oil inlet and outlet directions on the upper and lower sides of the pilot valve seat 2 are axial, that is, the oil inlet direction on the lower valve seat 22 is axial, the through direction of the oil inlet hole 221 is axial, and the oil outlet direction on the upper valve seat 21 is axial. The first ring member 211 has no holes in the circumference, and the oil flows out axially along the inner wall surface of the first ring member 211. The pilot valve seat 2 does not need to have oil holes in the circumference, and the processing of the pilot valve seat 2 is simpler; for the pilot valve seat with circumferential holes, the oil must turn upward after entering, and also needs to turn from axial to radial when the oil is discharged. The oil path has many bends, the resistance is large, and the oil flow is unstable. After the axial oil inlet and outlet is adopted, the oil does not need to turn after entering and can directly contact the pilot valve core 1. After flowing through the pilot valve core 1, it can directly flow out from the axial direction. The oil path has fewer bends and the oil flow is more stable.

[0108] In order to ensure the reliability of the pilot valve core 1, Fig.10 As shown, the pilot valve core 1 includes an upper valve core 11, a lower valve core 12 and a first oil passage 122 connecting the inner and outer sides of the pilot valve core 1. The lower valve core 12 can move axially relative to the upper valve core 11. The first oil passage 122 is arranged between the upper valve core 11 or the lower valve core 12 or the upper valve core 11 and the lower valve core 12. When the upper valve core 11 and the lower valve core 12 are in abutment with each other, the first oil passage 122 is a passage. The first oil passage 122 can communicate with the inside and outside of the pilot valve core 1, the outside is the part outside the radial direction of the pilot valve core 1, that is, it is connected with the clearance oil passage 62, and the inside is the part inside the pilot valve core 1 that is connected with the oil outlet hole 126; in this embodiment, the first oil passage 122 is arranged between the upper valve core 11 and the lower valve core 12, where the inside and outside of the pilot valve core 1 are relative to the groove platform 121, that is, the outside is the outside of the groove platform 121 along the radial direction of the pilot valve core 1, and the inside is the inside of the groove platform 121 along the radial direction of the pilot valve core 1. Of course, the first oil passage 122 can also be arranged on the upper valve core 11 or the lower valve core 12, and it is only necessary to open a hole on the corresponding upper valve core 11 or the lower valve core 12.

[0109] The valve sleeve 6 is provided with a clearance oil passage 62 , the clearance oil passage 62 is communicated with the first oil port 61 , and the first oil passage 122 is communicated with the clearance oil passage 62 .

[0110] The upper valve core 11 is used to be fixedly connected to the electromagnetic actuator 3, which increases the distance between the lower valve core 12 and the electromagnetic actuator 3, thereby adjusting the height of the lower valve core 12. The distance between the lower valve core 12 and the pilot valve seat 2 is reduced, so that the pilot spring 4 between the lower valve core 12 and the pilot valve seat 2 is compressed, thereby adjusting the preload force of the pilot spring 4; the design of the first oil circuit channel 122 enables the oil to flow through the first oil circuit channel 122 when the lower valve core 12 is not subjected to the force of the push rod 31 on the electromagnetic actuator 3, thereby improving stability.

[0111] In order to ensure the reliability of the structure of the upper valve core 11, Fig.11 As shown, the upper valve core 11 includes a fourth ring 111 and a fifth ring 112 from bottom to top, the top of the fourth ring 111 is connected to the bottom of the fifth ring 112; the outer diameter of the fourth ring 111 is greater than the outer diameter of the fifth ring 112; the inner diameter of the fourth ring 111 is the same as the inner diameter of the fifth ring 112. The fourth ring 111 is used to increase the distance between the lower valve core 12 and the electromagnetic actuator 3, and can also be used for limiting so that the fifth ring 112 can be pressed into place; the fifth ring 112 is used to cooperate with the electromagnetic actuator 3 for installation.

[0112] In order to ensure the reliability of the structure of the lower valve core 12, Fig.12 As shown, the lower valve core 12 includes a support seat 123, a second groove 125 is provided on the bottom surface of the support seat 123, and the upper end of the adjusting column 124 is connected to the bottom surface of the second groove 125; an oil outlet hole 126 is provided on the support seat 123; and there are at least two oil outlet holes 126. The support seat 123 is cylindrical as a whole; the adjusting column 124 is cylindrical as a whole; and the adjusting column 124 is coaxially arranged with the support seat 123. In this embodiment, six oil outlet holes 126 are provided. The second groove 125 can guide the oil, so as to facilitate the oil to be guided to the oil outlet hole 126.

[0113] In order to buffer the impact of the oil, the adjusting column 124 is arranged at the center of the supporting seat 123; the bottom surface of the adjusting column 124 is provided with an inwardly recessed buffer groove 127; the buffer groove 127 is coaxial with the oil inlet chamber 23; the buffer groove 127 and the bottom surface of the adjusting column 124 are transitioned by a chamfer. The design of the buffer groove 127 enables the oil coming up from the oil inlet chamber 23 to enter the buffer groove 127 first, thereby buffering the impact of the oil.

[0114] In order to ensure balanced oil flow, the oil holes 126 are evenly distributed around the center of the support seat 123; the projection of the oil holes 126 on the horizontal plane partially overlaps with the projection of the fourth ring 111 on the horizontal plane. The oil holes 126 are evenly distributed, which can ensure balanced and stable oil flow; the oil holes 126 partially overlap with the fourth ring 111, so that part of the oil flowing out of the oil holes 126 will collide with the bottom surface of the fourth ring 111, and the remaining part of the oil will directly pass through the fourth ring 111, preventing excessive impact force and making the oil flow more stable.

[0115] In order to ensure stable oil discharge, the area of ​​the overlapped portion of the projection of the oil outlet hole 126 and the fourth ring 111 on the horizontal plane is greater than half of the projection of the oil outlet hole 126 on the horizontal plane. The overlapped area of ​​the projection of the oil outlet hole 126 and the projection of the fourth ring 111 is large, and most of the oil flowing out of the oil outlet hole 126 will directly collide with the bottom surface of the fourth ring 111 and then flow out, and only a small part will pass through the fourth ring 111, thereby ensuring the stability of the oil flow.

[0116] In order to ensure the reliability of the second groove 125, the side wall of the second groove 125 is stepped, the lower end diameter of the second groove 125 is larger than the upper end diameter of the second groove 125; the second groove 125 and the bottom surface of the support seat 123 are transitioned by chamfers; adjacent steps on the side wall of the second groove 125 are transitioned by inclined surfaces. The side wall of the second groove 125 is stepped and larger at the bottom and smaller at the top, which facilitates the flow of oil toward the oil outlet 126 and the placement of the pilot spring 4.

[0117] In order to ensure the stability of oil flow, a second annular groove 1251 is provided on the bottom surface of the second groove 125, and the outer side wall of the second annular groove 1251 is connected to the side wall of the second groove 125; the inner side wall of the second annular groove 1251 is an inclined surface; and the bottom surface of the second annular groove 1251 is an arc surface. The design of the second annular groove 1251 can play a buffering role. Compared with the impact of the vertical surface, the oil on the bottom surface of the second groove 125 flows along the second annular groove 1251 to the side wall of the second groove 125, and the impact is smaller, thereby improving the stability of the oil flow and ensuring the overall stability of the valve core.

[0118] In order to ensure the reliability of the structure of the first oil passage 122, at least two grooves 121 are provided between the upper valve core 11 and the lower valve core 12, and the first oil passage 122 is formed between adjacent grooves 121; the grooves 121 are connected to the lower valve core 12; the grooves 121 are wedge-shaped with the outer side higher than the inner side; the projection of the upper valve core 11 on the horizontal plane completely covers the projection of the grooves 121 on the horizontal plane. In this embodiment, eight grooves 121 are provided; the outer surface of the grooves 121 and the outer surface of the lower valve core 12 are on the same arc surface. The wedge-shaped structure has little obstruction to the oil and ensures the stable flow of the oil. By adjusting the number of grooves 121, the oil pressure when there is no current can be adjusted.

[0119] In order to ensure the reliability of the valve core mechanism 8, the valve core mechanism 8 includes a main valve core 81 and a main spring 82. The main spring 82 is arranged between the main valve core 81 and the pilot valve assembly 0. The main valve core 81 can move axially relative to the valve sleeve 6. The main valve core 81 is provided with a feedback chamber 811 and a second channel 812. The second channel 812 is arranged just below the lower valve seat 22. The feedback chamber 811 is arranged on one end surface of the main valve core 81. One end of the second channel 812 is connected to the feedback chamber 811, and the other end is connected to the second oil port 71. An annular spring 83 is arranged between the main spring 82 and the pilot valve assembly 0. The elastic force of the spring 83 is less than the elastic force of the main spring 82. Since the elastic force of the spring 83 is small, the opening pressure is small, and the response speed is fast, the reaction of the entire valve core mechanism 8 is more sensitive, that is, the damping adjustment of the entire solenoid valve is more flexible and accurate.

[0120] In order to ensure reliable connection of the cylinder 5, an upper sealing cover 51 and a fixing ring 53 are provided on the top of the cylinder 5. The cross section of the fixing ring 53 is L-shaped after rotating 180°. A fixing groove 54 recessed toward the center is provided on the outer surface of the cylinder 5. The horizontal side of the fixing ring 53 abuts against the upper sealing cover 51, and part of the vertical side of the fixing ring 53 is embedded in the fixing groove 54. A lower sealing cover 52 is provided at the lower part of the cylinder 5, and the valve sleeve 6 is connected to the cylinder 5 through the lower sealing cover 52. The lower sealing cover 52 is annular as a whole. A first thread 55 is provided on the inner side surface of the cylinder 5, and a second thread 52 is provided on the outer diameter surface of the lower sealing cover 52. 1. The first thread 55 and the second thread 521 cooperate; the upper surface of the lower sealing cover 52 is provided with a third groove 522, and at least two third grooves 522 are provided. The lower sealing cover 52 can be rotated by inserting a rod into the third groove 522, which is convenient for the installation of the lower sealing cover 52 and the cylinder 5; the top of the magnetic tube 33 is provided with a third boss 332, and the bottom of the upper sealing cover 51 is provided with a limiting groove 511, and the third boss 332 cooperates with the limiting groove 511; the bottom of the magnetic tube 33 is provided with an outward third convex ring 334, and the inner side of the lower sealing cover 52 is provided with a third convex ring 334. The fixing ring 53 is used to block the upper sealing cover 51 and prevent the upper sealing cover 51 from falling out. One side of the fixing ring 53 is press-fitted with the fixing groove 54, so that the fixing ring 53 is completely fixed to the cylinder 5, and the fixing effect is firm; the lower sealing cover 52 is threadedly matched with the cylinder 5, so that the installation of the lower sealing cover 52 is convenient. Compared with the traditional design, the lower sealing cover 52 omits the circumferential outer portion of the coil 32 and uses the cylinder 5 as a part of the valve component, which saves materials and reduces weight.

[0121] When in use, the oil enters from the second oil port 71, and part of the oil passes through the main valve core 81 through the second channel 812 and enters the feedback chamber 811, and then flows into the guide chamber 24 through the oil inlet hole 221 on the lower valve seat 22, and then passes through the oil outlet hole 126 on the lower valve core 12. When the current is zero, the oil can enter the gap oil channel 62 through the first oil channel 122, and thus reach the outside of the valve sleeve 6; after the oil pressure increases, the oil pressure applied to the main valve core 81 will cause the main valve core 81 to move upward, and the lower end of the main valve core 81 is separated from the main valve seat 7, and the oil can flow out from between the lower end of the main valve core 81 and the main valve seat 7 and pass through the first oil port 61.

[0122] The above description is only a preferred embodiment of the present invention and does not limit the present invention in any form. Although the present invention has been disclosed as a preferred embodiment as above, it is not used to limit the present invention. Any technical personnel in this field can make some changes or modify the technical contents disclosed above into equivalent embodiments without departing from the scope of the technical solution of the present invention. However, any brief modifications, equivalent changes and modifications made to the above embodiments based on the technical essence of the present invention without departing from the content of the technical solution of the present invention are still within the scope of the technical solution of the present invention.

Claims

1. A solenoid valve, applied to a shock absorber, characterized in that: The invention comprises an electromagnetic actuator (3), a pilot valve assembly (0), a valve sleeve (6), a main valve seat (7) and a valve core mechanism (8); the electromagnetic actuator (3), the pilot valve assembly (0), the valve sleeve (6), the main valve seat (7) and the valve core mechanism (8) are all located in a cylinder (5); the valve sleeve (6) and the main valve seat (7) are mutually buckled; the valve sleeve (6) is connected to the cylinder (5); a first oil port (61) is provided on the valve sleeve (6); a second oil port (71) is provided on the main valve seat (7); the valve core mechanism (8) is arranged in the valve sleeve (6); the first oil port (61) changes the interception area through the sliding of the valve core mechanism (8); the pilot valve assembly (0) is arranged in the valve core mechanism ( 8), the electromagnetic actuator (3) is arranged on the top of the pilot valve assembly (0); the electromagnetic actuator (3) comprises a coil (32), a magnetic tube (33), a slider (34) and a push rod (31); the magnetic tube (33) is cylindrical, the coil (32) is sleeved on the magnetic tube (33), the bottom of the magnetic tube (33) is provided with an inwardly recessed mounting groove (331), and the slider (34) is slidably inserted into the mounting groove (331); the lower end of the slider (34) is connected to the upper end of the push rod (31); the highest point of the magnetic tube (33) is higher than the highest point of the coil (32), and the lowest point of the magnetic tube (33) is lower than the lowest point of the coil (32).

2. A solenoid valve according to claim 1, characterized in that: The slider (34) is provided with a first through hole (341) at its center; a magnetic isolation plate (35) is provided at the upper end of the slider (34), and the magnetic isolation plate (35) is connected to the top of the slider (34); a first boss (351) extending downward is provided at the center of the magnetic isolation plate (35), and the outer wall surface of the first boss (351) cooperates with the first through hole (341); a second through hole (352) is provided on the first boss (351), and the second through hole (352) connects the first through hole (341) and the top of the magnetic isolation plate (35).

3. A solenoid valve according to claim 2, characterized in that: The magnetic isolation plate (35) is provided with a second boss (353) extending upward; the top surface of the second boss (353) is an arc surface; the edge of the magnetic isolation plate (35) is provided with a first groove (354) recessed toward the center; the first through hole (341) includes an upper section (3411) and a lower section (3412), and the upper section (3411) and the lower section (3412) are connected by a step surface (3413); the diameter of the lower section (3412) is larger than the diameter of the upper section (3411); the top of the top rod (31) is arranged on the lower section (3412); and a gap (311) is provided between a part of the top rod (31) and the hole wall of the lower section (3412).

4. The solenoid valve according to claim 1, characterized in that: The pilot valve assembly (0) comprises a pilot valve core (1), a pilot valve seat (2) and a pilot spring (4), wherein the pilot spring (4) is located between the pilot valve core (1) and the pilot valve seat (2); the pilot valve seat (2) comprises an upper valve seat (21) and a lower valve seat (22), wherein the upper valve seat (21) is provided with an oil inlet cavity (23), the lower valve seat (22) is arranged on the oil inlet cavity (23), the lower valve seat (22) is provided with an oil inlet hole (221), and the upper valve seat (21) and the lower valve seat (22) are connected to each other. The seats (22) are detachably connected; the pilot valve core (1) is provided with an adjusting column (124) and an oil outlet hole (126); the adjusting column (124) can move axially with the pilot valve core (1) to change the flow rate of the oil inlet chamber (23); a guide chamber (24) is provided between the adjusting column (124) and the oil inlet chamber (23); the guide chamber (24) is respectively connected to the oil inlet chamber (23) and the oil outlet hole (126); and the oil inlet hole (221) is connected to the oil inlet chamber (23).

5. A solenoid valve according to claim 4, characterized in that: There are at least two oil inlet holes (221); the oil inlet holes (221) are evenly distributed around the center of the lower valve seat (22); the oil inlet cavity (23) comprises a circular hole section (231) and a conical hole section (232) from top to bottom, the bottom of the circular hole section (231) and the top of the conical hole section (232) are connected by a circular arc transition, and the cross-sectional area of ​​the conical hole section (232) gradually increases from top to bottom; the diameter of the circular hole section (231) is not greater than the top diameter of the conical hole section (232).

6. A solenoid valve according to claim 4, characterized in that: The pilot valve core (1) comprises an upper valve core (11), a lower valve core (12) and a first oil passage (122) communicating the inner side and the outer side of the pilot valve core (1); the lower valve core (12) can move axially relative to the upper valve core (11); the first oil passage (122) is arranged on the upper valve core (11) or the lower valve core (12) or between the upper valve core (11) and the lower valve core (12); when the upper valve core (11) and the lower valve core (12) are in abutment with each other, the first oil passage (122) is a passage; a clearance oil passage (62) is arranged on the valve sleeve (6); the clearance oil passage (62) is communicated with the first oil port (61); and the first oil passage (122) is communicated with the clearance oil passage (62).

7. A solenoid valve according to claim 6, characterized in that: The upper valve core (11) comprises, from bottom to top, a fourth ring member (111) and a fifth ring member (112); the top of the fourth ring member (111) is connected to the bottom of the fifth ring member (112); the outer diameter of the fourth ring member (111) is greater than the outer diameter of the fifth ring member (112); the inner diameter of the fourth ring member (111) is the same as the inner diameter of the fifth ring member (112); the lower valve core (12) comprises a support seat (123); a second groove (125) is provided on the bottom surface of the support seat (123); The upper end of the adjusting column (124) is connected to the bottom surface of the second groove (125); an oil outlet hole (126) is arranged on the support seat (123); there are at least two oil outlet holes (126); the adjusting column (124) is arranged at the center of the support seat (123); the bottom surface of the adjusting column (124) is provided with an inwardly recessed buffer groove (127); the buffer groove (127) is coaxial with the oil inlet cavity (23); and a chamfer transition is formed between the buffer groove (127) and the bottom surface of the adjusting column (124).

8. The solenoid valve according to claim 6, characterized in that: At least two groove platforms (121) are provided between the upper valve core (11) and the lower valve core (12), and a first oil path (122) is formed between adjacent groove platforms (121); the groove platforms (121) are connected to the lower valve core (12); the groove platforms (121) are wedge-shaped with a higher outer side and a lower inner side; and the projection of the upper valve core (11) on a horizontal plane completely covers the projection of the groove platforms (121) on the horizontal plane.

9. The solenoid valve according to claim 1, characterized in that: The valve core mechanism (8) comprises a main valve core (81) and a main spring (82). The main spring (82) is arranged between the main valve core (81) and the pilot valve assembly (0). The main valve core (81) can move axially relative to the valve sleeve (6). The main valve core (81) is provided with a feedback chamber (811) and a second channel (812). The feedback chamber (811) is arranged on one end surface of the main valve core (81). One end of the second channel (812) is connected to the feedback chamber (811), and the other end is connected to the second oil port (71). An annular spring sheet (83) is arranged between the main spring (82) and the pilot valve assembly (0). The elastic force of the spring sheet (83) is smaller than the elastic force of the main spring (82).

10. The solenoid valve according to claim 1, characterized in that: An upper sealing cover (51) and a fixing ring (53) are provided at the top of the cylinder (5); the cross section of the fixing ring (53) is L-shaped after being rotated 180 degrees as a whole; a fixing groove (54) recessed toward the center is provided on the outer surface of the cylinder (5); the horizontal side of the fixing ring (53) abuts against the upper sealing cover (51), and part of the vertical side of the fixing ring (53) is embedded in the fixing groove (54); a lower sealing cover (52) is provided at the lower part of the cylinder (5); the valve sleeve (6) is connected to the cylinder (5) through the lower sealing cover (52); the lower sealing cover (52) is annular as a whole; a first thread (55) is provided on the inner side surface of the cylinder (5); a second thread (521) is provided on the outer diameter surface of the lower sealing cover (52); the first thread (55) and the second thread (521) cooperate.

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