Pilot valve assembly, valve body unit with pilot valve assembly, electromagnetic valve and electric control hydraulic shock absorber

Abstract

The invention relates to the field of electromagnetic valves, in particular to a pilot valve assembly, a valve body unit with the pilot valve assembly, an electromagnetic valve and an electric control hydraulic shock absorber. The pilot valve element comprises a valve element body, and an abutting protrusion used for being matched with the front magnetic pole in an abutting mode is arranged on the valve element body. Through optimization of the structure of the pilot valve element, the sealing protrusion is formed on the pilot valve element, namely, through arrangement of the abutting sealing face, the sealing effect between the pilot valve element and the front magnetic pole can be guaranteed, and meanwhile the situation that the sealing performance between the pilot valve element and the front magnetic pole is prone to being affected by machining and assembling quality can be avoided or reduced.

Description

Technical Field

[0001] The present invention relates to the field of solenoid valves, in particular to a pilot valve assembly, a valve body unit having the pilot valve assembly, a solenoid valve and an electronically controlled hydraulic shock absorber. Background Art

[0002] In the field of modern hydraulic systems and variable damping shock absorbers, solenoid valves, as a key control component, are widely used to regulate oil flow and pressure.

[0003] Traditional solenoid valves usually use a complex multi-component structure to control the flow of oil, for example, adjusting the flow area of the oil through the cooperation of the pilot valve core and the main valve core.

[0004] However, this traditional design has some shortcomings:

[0005] 1. The seal between the traditional pilot valve core and the front magnetic pole is sealed by the contact between the pilot valve core end face and the front magnetic pole. It is greatly affected by the processing quality of the pilot valve core end face and the assembly quality of the front magnetic pole, and there is a possibility of poor sealing.

[0006] 2. When the power is off, the throttling is done by the gap between the pilot valve core and the pilot housing. The pressure curve in the fail-safe mode is very different from that in the live operation mode, which has significant disadvantages for vehicle applications.

[0007] 3. In order to ensure the consistency of the solenoid valve when it is powered off, the clearance between the pilot valve core and the pilot housing needs to be processed very accurately, which increases the processing difficulty and cost. At the same time, the clearance between the pilot valve core and the housing serves as a flow channel, which is prone to impurities getting stuck.

[0008] 4. When the power is turned on, the oil flows from the front chamber to the rear chamber through the uniformly distributed holes of the pilot valve core. When the pilot valve core moves, the damping effect of the small holes on the oil flow may delay the response speed of the pilot valve, thereby affecting the overall dynamic performance of the solenoid valve;

[0009] In the prior art, patent document CN112815033A proposes a solenoid valve for a variable damping shock absorber, but does not explicitly disclose the technical content for solving the above-mentioned technical problems.

[0010] Therefore, in order to improve or solve at least one of the above technical problems, it is necessary to optimize the design of the existing solenoid valve structure. Summary of the Invention

[0011] The object of the present invention is to provide a pilot valve assembly capable of ensuring the sealing performance of the connection between the pilot valve core and the front magnetic pole.

[0012] In order to achieve the above object, the technical solution adopted by the present invention is:

[0013] A pilot valve assembly includes a pilot valve core; the pilot valve core includes a valve core body, and the valve core body is provided with a pressing protrusion for pressing and matching with a front magnetic pole.

[0014] The outer side surface of the pressing protrusion away from the valve core body is a pressing sealing surface; the pressing sealing surface is a conical surface or an arc surface.

[0015] An installation recess is provided at one end of the valve core body away from the pressing protrusion.

[0016] A valve body unit comprises a hydraulic unit and a valve plate unit; the hydraulic unit comprises a main valve assembly and the pilot valve assembly; the pilot valve assembly is arranged in the main valve assembly; the valve plate unit is arranged on the main valve assembly;

[0017] The main valve assembly includes a pilot housing; the pilot housing is provided with an oil channel;

[0018] The valve plate unit includes a control valve plate; the control valve plate is arranged at the end of the pilot housing; the control valve plate can be deformed;

[0019] After the control valve plate is deformed, a communication channel is formed between the control valve plate and the pilot housing; and the pilot valve core in the pilot valve assembly can move within the pilot housing.

[0020] The valve body unit also includes a connecting mechanism arranged between the pilot valve core and the pilot housing; the connecting mechanism includes a flow groove arranged on the pilot valve core and / or the pilot housing; the flow groove is used for oil to flow from the area between the pilot valve core and the pilot housing to the control valve plate.

[0021] The pilot valve assembly further includes a circulation mechanism; the circulation mechanism divides the oil channel into a pilot inner cavity and a main valve inner cavity;

[0022] The circulation mechanism includes a connecting rod; the connecting rod includes a connecting rod body; the connecting rod body is provided with a connecting rod channel and a connecting rod side channel;

[0023] The connecting rod channel is connected to the pilot inner cavity; the connecting rod channel is connected to the main valve inner cavity through the connecting rod side channel.

[0024] The circulation mechanism further includes a guide sleeve, and the connecting rod is arranged in the pilot housing through the guide sleeve.

[0025] A limiting groove is provided at the end of the pilot housing; the control valve plate is arranged in the limiting groove; a pilot oil outlet is provided on the pilot housing; the limiting groove is connected to the pilot oil outlet; after the control valve plate is deformed, the connecting channel is connected to the pilot oil outlet.

[0026] A solenoid valve for a variable damping shock absorber, comprising an electromagnetic drive assembly and the valve body unit;

[0027] The electromagnetic drive assembly includes an electromagnetic unit and a coil unit;

[0028] The electromagnetic unit includes an electromagnetic housing, in which an armature assembly is arranged. The armature assembly includes an armature body and an armature push rod connected to the armature body. The armature push rod can pass through the control valve plate and contact the pilot valve core.

[0029] The coil unit can drive the armature assembly to move axially along the armature push rod; the armature push rod can push the pilot valve core in the pilot valve assembly to move;

[0030] The electromagnetic housing is connected to the pilot housing; the pilot valve assembly is arranged opposite to the armature push rod;

[0031] The main valve assembly also includes a main valve piston arranged in a pilot housing; the end of the pilot housing is provided with a main valve seat;

[0032] The main valve piston and the armature assembly are respectively distributed at both ends of the pilot valve assembly;

[0033] The main valve piston is distributed in the area between the main valve seat and the pilot valve assembly;

[0034] The pilot housing is provided with a pilot oil outlet and a main oil outlet; the pilot oil outlet is located at one end of the pilot housing close to the armature assembly; the main oil outlet is located at one end of the pilot housing close to the main valve seat;

[0035] The pilot valve core is located in a pilot inner cavity in the oil channel; and the main valve piston is arranged in the main valve inner cavity in the oil channel.

[0036] The control valve plate is connected to the electromagnetic housing via a magnetic pole structure; the magnetic pole structure includes a front magnetic pole arranged in the electromagnetic housing; the control valve plate is connected to the electromagnetic housing via the front magnetic pole.

[0037] The front magnetic pole includes a magnetic pole body; a through-connection channel is provided on the magnetic pole body; the armature push rod is arranged through the front magnetic pole; a liquid flow gap is provided between the armature push rod and the through-connection channel; the magnetic pole body includes a magnetic pole base; a magnetic pole protrusion is provided on the magnetic pole base; the control valve plate is connected to the magnetic pole protrusion; a lateral channel is provided on the magnetic pole base, and the through-connection channel is connected to the pilot oil outlet through the lateral channel; the pressing protrusion in the pilot valve core is inserted into the end of the through-connection channel.

[0038] The solenoid valve also includes a pilot elastic unit and a main valve elastic unit; the main valve elastic unit includes a main valve spring; one end of the main valve spring is connected to the main valve piston, and the other end is connected to the circulation mechanism, and the pilot elastic unit includes a pilot spring; one end of the pilot spring is connected to the pilot valve core, and the other end is connected to the circulation mechanism.

[0039] An electronically controlled hydraulic shock absorber comprises the solenoid valve;

[0040] The electronically controlled hydraulic shock absorber includes a power-on working mode and a power-off working mode;

[0041] The power-on working mode is: the solenoid valve controls the pressure value of the hydraulic oil flowing through the solenoid valve according to the working current received by the coil unit in the solenoid valve;

[0042] The power-off working mode is that the solenoid valve controls the pressure value of the hydraulic oil flowing through the solenoid valve according to the deformation of the control valve plate.

[0043] The advantages of the present invention are:

[0044] The invention discloses a pilot valve assembly, a valve body unit, a solenoid valve and an electronically controlled hydraulic shock absorber having the pilot valve assembly.

[0045] The present invention optimizes the structure of the pilot valve core so that a sealing protrusion is formed on the pilot valve core. That is, by setting a pressure sealing surface, it can ensure the sealing effect between the pilot valve core and the front magnetic pole while avoiding or reducing the sealing between the pilot valve core and the front magnetic pole being easily affected by processing and assembly quality.

[0046] In addition, the present invention controls the setting of the valve plate, and after the current of the coil unit in the solenoid valve is disconnected, it can also realize the overflow and discharge of hydraulic oil by controlling the deformation of the valve plate; in addition, the pressure value of the hydraulic oil flowing through the solenoid valve is controlled by controlling the deformation of the valve plate; when it is convenient for actual use, the damping hardness of the shock absorber can be adjusted according to needs.

[0047] The present invention changes the throttling method of the traditional gap between the pilot valve core and the pilot housing by setting the circulation groove, and improves the possibility of impurities being stuck in the gap by increasing the gap; in addition, the present invention can reduce or avoid the influence of the oil flow on the movement of the pilot valve core by setting the circulation groove; thereby effectively improving the response speed delay problem caused by the movement characteristics of the pilot valve core being affected by the pressure of the front and rear cavities of the inner cavity where the pilot valve core is located, ensuring that the pilot valve core slides freely in the valve sleeve, and improving the working performance of the variable damping shock absorber solenoid valve. BRIEF DESCRIPTION OF THE DRAWINGS

[0048] The following is a brief description of the contents and symbols in the drawings of the present invention:

[0049] Figure 1 It is a cross-sectional view of the pilot valve core in the present invention.

[0050] Figure 2 It is a top view of the pilot valve core in the present invention.

[0051] Figure 3 This is a top view of the pilot housing of the present invention with a flow groove.

[0052] Figure 4 This is a cross-sectional view of the pilot housing of the present invention having a flow groove machined therein.

[0053] Figure 5 This is a cross-sectional view of the valve body unit when the solenoid valve is powered off in the present invention.

[0054] Figure 6 This is a cross-sectional view of the valve body unit when the solenoid valve is energized in the present invention.

[0055] In the figure: 1. Armature push rod; 2. Front magnetic pole; 3. Pilot valve core; 4. Pilot housing; 5. Pilot spring; 6. Solenoid housing; 7. Guide sleeve; 8. Connecting rod; 9. Main valve piston; 10. Main valve seat; 11. Control valve plate; A. Flow groove; B. Pilot oil outlet; C. Liquid storage cylinder; D. Main oil outlet; E. Oil inlet. DETAILED DESCRIPTION

[0056] The specific implementation of the present invention will be further explained in detail below by describing the best embodiment with reference to the accompanying drawings.

[0057] A pilot valve assembly includes a pilot valve core 3; the pilot valve core 3 includes a valve core body 31, and the valve core body 31 is provided with a pressing protrusion 32 for pressing against the front magnetic pole 2; the present invention optimizes the structure of the pilot valve core 3 so that a sealing protrusion is formed on the pilot valve core 3, that is, through the provision of a pressing sealing surface 34, while ensuring the sealing effect between the pilot valve core 3 and the front magnetic pole 2, it can also avoid or reduce the sealing between the pilot valve core 3 and the front magnetic pole 2 being easily affected by processing and assembly quality.

[0058] In the present invention, the pilot valve core 3 is the core structure of the pilot valve assembly: the pilot valve core 3 mainly includes a valve core body 31: it is usually a metal component with a certain shape and size, used to control the flow of oil in the hydraulic system.

[0059] The pressing protrusion 32 is an important feature of the valve core body 31 .

[0060] Its function is to press fit with the front magnetic pole 2, which means that during operation, the pressing protrusion 32 will contact the front magnetic pole 2 and achieve sealing or other functions through pressure.

[0061] The valve core body 31 and the pressing protrusion 32 of the present invention are an integrated structure. The disassembly discussion here is only for the convenience of describing the pressing sealing surface 34, but it does not mean that the valve core body 31 and the pressing protrusion 32 are separate structures.

[0062] The design of the pressing protrusion 32 is crucial to the performance of the pilot valve assembly. It needs to have sufficient strength and precision to ensure a good fit with the front magnetic pole 2 .

[0063] The cooperation between the pressing protrusion 32 and the front magnetic pole 2 is one of the key functions of the pilot valve assembly.

[0064] This fit may be used to create a seal, control the direction of oil flow, or regulate oil pressure.

[0065] Through the press-fitting, the sealing performance of the press-fitting portion between the pilot valve core 3 and the front magnetic pole 2 can be better ensured.

[0066] When in use, the valve core body 31 cooperates with the inner hole of the pilot housing 4 to ensure the linearity of the operation of the pilot valve core 3. In addition, the end of the pressing protrusion 32 of the present invention is equivalent to being inserted into the end of the connecting channel 24 of the front magnetic pole 2; it ensures the sealing between the pilot valve core 3 and the front magnetic pole 2, and avoids the sealing between the pilot valve core 3 and the front magnetic pole 2 being affected by processing and assembly.

[0067] Furthermore, in the present invention, the outer side surface of the pressing protrusion 32 away from the valve core body 31 is a pressing sealing surface 34; the pressing sealing surface 34 is a conical surface or an arc surface; the pressing sealing surface 34 is located on the outer side surface of the pressing protrusion 32 away from the valve core body 31; for convenience in subsequent use, the pressing protrusion 32 and the front magnetic pole 2 cooperate with each other to optimize the fitting seal between the two.

[0068] In the present invention, the pressing sealing surface 34 can be a conical surface or an arc surface.

[0069] In the present invention, the outer side surface of the pressing protrusion 32 is a conical surface: in essence, the extrusion protrusion includes a protrusion body, and a conical surface is formed on the outer side surface of the protrusion body; from the main view, the conical surface here is equivalent to the cross-sectional shape of the outer side surface of the protrusion body being an inclined surface. With this arrangement, when used subsequently, the pressing protrusion 32 is inserted into the lower end of the connecting channel 24, and the conical surface is pressed against the edge of the connecting channel 24, thereby providing better sealing performance.

[0070] The shape of the conical surface allows the contact area between the pressing protrusion 32 and the front magnetic pole 2 to be automatically adjusted according to the pressure, thereby achieving a better sealing effect.

[0071] In the present invention, the outer side surface of the pressing protrusion 32 is an arc-shaped surface: in essence, the extrusion protrusion includes a protrusion body, and an arc-shaped surface is formed on the outer side surface of the protrusion body; from the main view, the arc-shaped surface here is equivalent to the cross-sectional shape of the outer side surface of the protrusion body being arc-shaped, and the arc-shaped surface can provide a more uniform contact pressure distribution, reduce local stress concentration, and extend the service life of the component.

[0072] The design of the arc surface can also improve the movement characteristics between the pressing protrusion 32 and the front magnetic pole 2, reducing friction and wear.

[0073] The design of the conical surface or the arcuate surface can significantly improve the sealing performance of the pressure sealing surface 34 .

[0074] This shape design can better adapt to slight errors in processing and assembly, thereby maintaining a good sealing effect in actual applications.

[0075] In the present invention, the pressing sealing surface 34 includes a transverse end surface 341 and a frustum annular surface 342; generally speaking, the overall structure of the pressing sealing surface 34 is a conical frustum; in the present invention, the transverse end surface 341 is used to fit and press against the end of the armature push rod 1 to ensure the accuracy and stability of the relative arrangement positions of the two, and also facilitate the stability of the subsequent push of the pilot valve core 3 by the subsequent armature push rod 1; the setting of the frustum annular surface 342 makes the pressing protrusion 32 have a structure with one end larger and the other end smaller. Such a setting makes the small head end of the pressing protrusion 32 able to be inserted into the connection channel 24, and connected with the end of the connection channel 24 through the outer side surface of the pressing protrusion 32; it is equivalent to a plunger inserted at the bottle mouth, thereby better ensuring the sealing of the connection between the pilot valve core 3 and the front magnetic pole 2.

[0076] Furthermore, in the present invention, the valve core body 31 is provided with a mounting groove at one end away from the pressing protrusion 32; the setting of the mounting groove is mainly used to limit the position of the pilot spring 5 to ensure the stability of the connection between the pilot spring 5 and the pilot valve core 3; at the same time, the pilot valve core 3 is supported by the pilot spring 5; the pressing protrusion 32 at the upper end of the pilot valve core 3 is inserted into the connection channel 24 of the front magnetic pole 2, which significantly improves the sealing of the joint between the pilot valve core 3 and the front magnetic pole 2.

[0077] A valve body unit includes a hydraulic unit and a valve plate unit; the hydraulic unit includes a main valve assembly and the pilot valve assembly; the pilot valve assembly is arranged in the main valve assembly; the valve plate unit is arranged on the main valve assembly; the pilot valve assembly and the valve plate unit are arranged opposite to each other; the main valve assembly includes a pilot housing 4; the pilot housing 4 is provided with an oil channel 41; the valve plate unit includes a control valve plate 11; the control valve plate 11 is arranged at the end of the pilot housing 4; the control valve plate 11 can be deformed; after the control valve plate 11 is deformed, a connecting channel is formed between the control valve plate 11 and the pilot housing 4; the pilot valve core 3 in the pilot valve assembly can move in the pilot housing 4; based on the above design, the pilot valve assembly and the valve plate unit can work together to achieve precise control of the oil flow; and can also play a vibration absorption role, and at the same time can also realize the operation of the solenoid valve in two working modes: power on and power off.

[0078] In the present invention, the main valve assembly is the main part of the hydraulic unit, and includes a pilot housing 4 ; the pilot housing 4 is provided with an oil channel 41 for guiding the oil to flow in the main valve assembly.

[0079] The pilot valve assembly is arranged in the main valve assembly and works together with the main valve assembly to control the flow and pressure regulation of the oil.

[0080] The valve plate unit mainly includes a control valve plate 11 : the control valve plate 11 is arranged at the end of the pilot housing 4 ; the control valve plate 11 is required to have a certain elasticity and be able to deform.

[0081] When the control valve plate 11 is deformed, a communication channel is formed between the control valve plate 11 and the pilot housing 4 for the flow of oil; when the coil unit is powered off, the oil can also be discharged from the pilot oil port B.

[0082] The present invention requires that the control valve plate 11 be pre-tightened against the pilot housing 4. When the power is off, the pilot valve core 3 is sealed on the front magnetic pole 2, and the hydraulic oil overflows through the connecting channel between the control valve plate 11 and the pilot housing 4. The desired pressure curve is adjusted by adjusting the pre-tightening force or thickness of the control valve plate 11.

[0083] The present invention effectively reduces pressure fluctuation and overshoot in the solenoid valve by designing the control valve plate 11 to be a spring overflow, saves component costs, and can be better applied to variable damping shock absorbers.

[0084] In the present invention, the pilot valve assembly and the valve plate unit are arranged opposite to each other. This design enables the pilot valve assembly and the valve plate unit to work together to achieve control of the flow of oil.

[0085] When the control valve disc 11 is deformed, a communication channel is formed between the control valve disc 11 and the pilot housing 4 , thereby changing the flow path and flow rate of the oil.

[0086] Furthermore, in the present invention, the valve body unit also includes a communication mechanism arranged between the pilot valve core 3 and the pilot housing 4; the present invention improves the possibility of impurities being stuck in the gap between the pilot valve core 3 and the pilot housing 4 through the setting of the communication mechanism.

[0087] In the present invention, the connecting mechanism includes a flow groove A arranged on the pilot valve core 3 and / or the pilot housing 4; the flow groove A is used for the oil to flow from the area between the pilot valve core 3 and the pilot housing 4 to the control valve plate 11; the flow groove A is an additional hole structure. When the power is cut off, the gap between the pilot valve core 3 and the matching pilot housing 4 no longer serves as a channel for oil throttling, so the size of the gap does not require special fine processing, reducing the processing difficulty.

[0088] At the same time, the oil flows through the specially designed flow groove A and no longer passes through the above-mentioned gap, so the risk of stagnation is also lower.

[0089] In addition, in the present invention, the flow groove A is provided on the pilot valve element 3 and / or the pilot housing 4 as needed.

[0090] In actual design, the flow groove A can be set on the outer wall of the pilot valve core 3 or the inner wall of the pilot housing 4, or on both the outer wall of the pilot valve core 3 and the inner wall of the pilot housing 4. The specific setting position can be selected as needed.

[0091] During general implementation, three flow grooves A are generally set between the pilot valve core 3 and the pilot housing 4, and the three flow grooves A are evenly distributed at intervals; for example, three flow grooves A are set on the inner wall of the pilot housing 4; the oil flows from the front cavity of the pilot valve core 3 to the rear cavity through the three flow grooves A set on the pilot housing 4, and the flow is not affected by the movement of the pilot valve core 3, thereby effectively improving the response speed delay problem caused by the influence of the front and rear cavity pressure on the pilot valve movement characteristics, ensuring that the pilot valve core 3 slides freely in the pilot housing 4, and improving the working performance of the variable damping shock absorber solenoid valve.

[0092] The communication mechanism is provided between the pilot valve element 3 and the pilot housing 4 .

[0093] The communication mechanism includes a flow groove A, which can be provided on the pilot valve core 3, the pilot housing 4, or both.

[0094] The function of the flow groove A is to allow oil to flow from the area between the pilot valve core 3 and the pilot housing 4 to the control valve plate 11 .

[0095] This design changes the traditional throttling method of relying solely on the gap between the pilot valve core 3 and the pilot housing 4, and provides a more efficient oil flow path.

[0096] It has the following advantages:

[0097] Reduce impurity jam:

[0098] By providing the flow groove A, the effective flow area between the pilot valve core 3 and the pilot housing 4 can be increased, thereby reducing the possibility of impurities being stuck.

[0099] In conventional designs, the narrow gap between the pilot valve core 3 and the housing is easily clogged by impurities, causing system failure.

[0100] Improve oil flow characteristics:

[0101] The design of the flow groove A can reduce the influence of the movement of the pilot valve core 3 on the oil flow.

[0102] In a conventional design, the movement of the pilot valve core 3 may cause instability in the oil flow, thereby affecting the response speed and performance of the system; through the flow groove A, the oil can flow more smoothly, reducing the oil pressure fluctuation caused by the movement of the pilot valve core 3.

[0103] Improve responsiveness:

[0104] The design of the flow groove A can improve the movement characteristics of the pilot valve core 3 so that it is not affected by the pressure of the front and rear cavities of the inner cavity where it is located.

[0105] This helps to improve the response speed of the pilot valve core 3 and ensures that the system can quickly and accurately regulate the flow of oil.

[0106] Furthermore, in the present invention, the pilot valve assembly also includes a circulation mechanism; the circulation mechanism divides the oil channel 41 into a pilot inner cavity 411 and a main valve inner cavity 412; the circulation mechanism includes a connecting rod 8; the connecting rod 8 includes a connecting rod body 81; the connecting rod body 81 is provided with a connecting rod channel 82 and a connecting rod side channel 83; the connecting rod channel 82 is connected to the pilot inner cavity 411; the connecting rod channel 82 is connected to the main valve inner cavity 412 through the connecting rod side channel 83; the circulation mechanism is a part of the pilot valve assembly. In the present invention, the pilot valve assembly is arranged in the pilot housing 4. In essence, the oil channel 41 is separated by the arrangement of the pilot valve assembly. The pilot inner cavity 411 and the main valve inner cavity 412 of the present invention are two independent chambers. When the oil flows from the main valve inner cavity 412 to the pilot inner cavity 411, it can only be achieved through the pilot valve assembly.

[0107] The function of the circulation mechanism is to separate the oil channel 41 into two independent areas: the pilot inner cavity 411 and the main valve inner cavity 412; the circulation mechanism includes a connecting rod 8, which is a key component for realizing the separation and connection of the oil channel 41.

[0108] The connecting rod 8 includes a connecting rod body 81 , on which a connecting rod channel 82 and a connecting rod side channel 83 are provided.

[0109] The connecting rod channel 82 is in communication with the pilot inner cavity 411 and is used to guide the oil to flow into the pilot inner cavity 411 .

[0110] The connecting rod side channel 83 connects the connecting rod channel 82 with the main valve inner cavity 412, allowing oil to flow from the connecting rod channel 82 to the main valve inner cavity 412; based on this design, the oil entering through the oil inlet can easily enter the main valve inner cavity 412 on the back of the main valve piston 9.

[0111] In the present invention, the circulation mechanism also includes a guide sleeve 7, and the connecting rod 8 is arranged in the pilot housing 4 through the guide sleeve 7; the vertical cross-section of the guide sleeve 7 is T-shaped; the outer side surface of the guide sleeve 7 is in contact with the inner wall of the oil channel 41, and the two are fixedly connected, and the connection method can be welding or interference fit; and an assembly hole is provided on the guide sleeve 7, and the subsequent connecting rod 8 is assembled in the assembly hole of the guide sleeve 7. In other words, the connecting rod 8 is connected to the inside of the pilot housing 4 through the guide sleeve 7; the setting of the guide sleeve 7 serves as a connecting guide, and the upper end of the guide sleeve 7 is used to limit the lower end of the pilot spring 5, and the lower end of the guide sleeve 7 is used to limit the upper end of the main valve spring.

[0112] At the same time, in order to facilitate the circulation of oil, a flow measuring hole is provided on the guide sleeve 7, and the flow measuring hole is connected to the connecting rod side channel 83.

[0113] At the same time, in the present invention, the circulation mechanism divides the oil channel 41 in a variety of ways, which can be specifically designed according to needs.

[0114] In addition, in the present invention, the oil channel 41 is generally a stepped hole structure; the specific structure can be selected according to the requirements; it is convenient for installing and positioning the corresponding parts assembled in the pilot housing 4.

[0115] Furthermore, in the present invention, a limiting groove 42 is provided at the end of the pilot housing 4; the control valve plate 11 is arranged in the limiting groove 42; in the present invention, the limiting groove 42 is provided at the end of the pilot housing 4, mainly for accommodating the control valve plate 11, and the setting of the limiting groove 42 enables the pilot housing 4 to form a stepped platform, which facilitates the overlap of the control valve plate 11 at the end of the pilot housing 4.

[0116] The design of the limiting sink 42 can effectively limit the movement range of the control valve plate 11, thereby improving the reliability and stability of the system.

[0117] In addition, in the present invention, a pilot oil outlet B is provided on the pilot housing 4; the limiting groove 42 is connected to the pilot oil outlet B; after the control valve plate 11 is deformed, the connecting channel is connected to the pilot oil outlet B; the pilot oil outlet B is provided on the pilot housing 4, usually close to the limiting groove 42; it is mainly used to discharge the oil from the pilot housing 4; specifically, when the control valve plate 11 is deformed, a connecting channel will be formed between the control valve plate 11 and the pilot housing 4, so that the oil can flow to the pilot oil outlet B through the connecting channel.

[0118] In addition, the oil outlet B is connected to the limiting sink 42, so that the oil can flow out smoothly from the communication channel in the limiting sink 42, reducing the resistance during the flow of the oil.

[0119] A solenoid valve for a variable damping shock absorber comprises an electromagnetic drive assembly and a valve body unit; the electromagnetic drive assembly comprises an electromagnetic unit and a coil unit; the electromagnetic unit comprises an electromagnetic housing 6, an armature assembly is provided in the electromagnetic housing 6, the armature assembly comprises an armature body and an armature push rod 1 connected to the armature body; the armature push rod 1 can pass through a control valve plate 11 and contact a pilot valve core 3; the coil unit can drive the armature assembly to run axially along the armature push rod 1; the armature push rod 1 can push the pilot valve core 3 in the pilot valve assembly to move; the pilot valve assembly and the armature push rod 1 are arranged relative to each other; the electromagnetic drive assembly is the power source of the solenoid valve, responsible for converting electrical energy into mechanical energy, driving the movement of components in the valve body unit, and thus controlling the flow of oil.

[0120] The electromagnetic housing 6 serves as the outer shell of the electromagnetic unit, protecting and fixing the internal components, and also provides necessary structural support for the formation of the electromagnetic field.

[0121] The armature assembly comprises an armature body and an armature push rod 1 .

[0122] The armature body is the main component of the electromagnetic force. When the coil unit is energized, the armature body moves axially under the action of the electromagnetic force, driving the armature push rod 1 to move.

[0123] The armature push rod 1 is essentially more like a pushing or squeezing rod, which can pass through the control valve plate 11 and contact the pilot valve core 3, and squeeze the pilot valve core 3 through its own movement, thereby controlling the position of the pilot valve core 3.

[0124] The coil unit is one of the core components of the electromagnetic drive assembly, which consists of coil windings and related electrical connections.

[0125] When the coil unit is energized, an electromagnetic field is generated to drive the armature assembly to move axially along the armature push rod 1 .

[0126] By controlling the magnitude and direction of the current in the coil unit, the movement of the armature assembly can be precisely controlled, thereby achieving control of the oil flow.

[0127] In addition, in the present invention, the electromagnetic housing 6 is connected to the pilot housing 4; the connection between the two is various, and can be one or more of interference fit, welding, screw connection or riveting.

[0128] The connection between the electromagnetic housing 6 and the pilot housing 4 forms an integral structure, which improves the overall stability and reliability of the electromagnetic valve.

[0129] In the present invention, the main valve assembly also includes a main valve piston 9 arranged in the pilot housing 4; a main valve seat 10 is provided at the end of the pilot housing 4; the main valve piston 9 and the armature assembly are respectively distributed at both ends of the pilot valve assembly; a main valve seat 10 is provided at the end of the pilot housing 4, and the main valve piston 9 is distributed in the area between the main valve seat 10 and the pilot valve assembly; the main valve seat 10 is the reference surface for the movement of the main valve piston 9, and an oil inlet is provided on the main valve seat 10. During subsequent use, oil can enter through the oil inlet; then a part of the oil can flow from the channel between the main valve seat 10 and the main valve piston 9 to the main oil outlet D.

[0130] In the present invention, the main valve piston 9 moves according to the change of the oil pressure, and controls the flow rate and pressure of the oil flowing from the main valve seat 10 to the main oil outlet D.

[0131] In the present invention, the pilot housing 4 is provided with a pilot oil outlet B and a main oil outlet D; the pilot oil outlet B is distributed at one end of the pilot housing 4 close to the armature assembly; the main oil outlet D is distributed at one end of the pilot housing 4 close to the main valve seat 10; in the present invention, the pilot oil outlet B is used to discharge the oil flowing out of the pilot valve assembly.

[0132] The main oil outlet D is located at one end of the pilot housing 4 close to the main valve seat 10 ; it is used to discharge the oil flowing out between the main valve seat 10 and the main valve piston 9 .

[0133] A main valve seat 10 and a limiting recess 42 are respectively provided at both ends of the pilot housing 4 . A control valve disc 11 is arranged in the limiting recess 42 . The control valve disc 11 is overlapped on the stepped platform formed by the limiting recess 42 .

[0134] The function of the main valve piston 9 is to move according to the change of oil pressure, thereby adjusting the opening of the main valve and controlling the flow of oil.

[0135] In addition, in the present invention, the control valve plate 11 is connected to the electromagnetic housing 6 via a magnetic pole structure; the provision of the magnetic pole structure facilitates the installation of the control valve plate 11 in the electromagnetic housing 6 .

[0136] In the present invention, the pilot valve core 3 is located in the pilot inner cavity 411 in the oil channel 41; the main valve piston 9 is arranged in the main valve inner cavity 412 in the oil channel 41; based on this design, the arrangement and placement of the pilot valve core 3 and the main valve piston 9 in the pilot housing 4 are facilitated.

[0137] Furthermore, in the present invention, the control valve plate 11 is connected to the electromagnetic housing 6 through a magnetic pole structure; the magnetic pole structure includes a front magnetic pole 2 arranged in the electromagnetic housing 6; the control valve plate 11 is connected to the electromagnetic housing 6 through the front magnetic pole 2; the setting of the magnetic pole structure facilitates the installation of the control valve plate 11 in the electromagnetic housing 6.

[0138] Specifically, in the present invention, the magnetic pole structure includes a front magnetic pole 2 arranged in the electromagnetic housing 6; the control valve plate 11 is connected to the electromagnetic housing 6 through the front magnetic pole 2; the front magnetic pole 2 acts as a connecting piece to facilitate the installation and connection of the control valve plate 11 in the electromagnetic housing 6. In addition, the front magnetic pole 2 cooperates with the armature push rod 1 to play a good sealing and guiding role, which is beneficial to the control of the running trajectory of the oil discharged from the pilot valve assembly.

[0139] At the same time, because the present invention requires the control valve plate 11 to be deformable, the front pole 2 disclosed in the present invention can also provide a placement position for the control valve plate 11, facilitating the overlap of the control valve plate 11 at the end of the pilot housing 4.

[0140] At the same time, in the present invention, the front magnetic pole 2 includes a magnetic pole body; the magnetic pole body is the main structure of the front magnetic pole 2, and a through-channel 24 is provided on the magnetic pole body; the armature push rod 1 is arranged through the front magnetic pole 2; the setting of the through-channel 24 facilitates the armature push rod 1 to pass through the front magnetic pole 2.

[0141] Furthermore, in the present invention, the front magnetic pole 2 includes a magnetic pole body; a connecting channel 24 is provided on the magnetic pole body; the armature push rod 1 is arranged through the front magnetic pole 2; a liquid flow gap is provided between the armature push rod 1 and the connecting channel 24; the magnetic pole body includes a magnetic pole base 21; a magnetic pole protrusion 22 is provided on the magnetic pole base 21; the control valve plate 11 is connected to the magnetic pole protrusion 22; a lateral channel 23 is provided on the magnetic pole base 21, and the connecting channel 24 is connected to the pilot valve through the lateral channel 23. The oil outlet B is connected; the pressing protrusion 32 in the pilot valve core 3 is inserted into the end of the connecting channel 24; in the present invention, the magnetic pole body as a whole is a boss structure, and the control valve plate 11 and the magnetic pole base 21 are spaced apart; a lateral channel 23 is provided on the magnetic pole base 21, and the connecting channel 24 is connected to the pilot oil outlet B through the lateral channel 23; based on this design, when the armature push rod 1 pushes the pilot valve core 3, the oil can flow to the pilot oil outlet B through the connecting channel 24 and the flow gap.

[0142] In the present invention, the connecting channel 24 is provided through the magnetic pole body.

[0143] In addition, in the present invention, a through-channel 24 is provided on the magnetic pole body for accommodating the armature push rod 1 .

[0144] The armature push rod 1 passes through the connection channel 24 of the front magnetic pole 2, so that the armature push rod 1 can move axially under the action of the magnetic field.

[0145] There is a fluid gap between the armature push rod 1 and the connecting channel 24, allowing oil to flow in the channel.

[0146] The magnetic pole body includes a magnetic pole base 21 , on which a magnetic pole protrusion 22 is provided.

[0147] The control valve plate 11 is connected to the magnetic pole protrusion 22. Through the connection between the magnetic pole protrusion 22 and the magnetic pole base 21, this arrangement can ensure that there is a gap between the control valve plate 11 and the magnetic pole base 21, thereby preventing the existence of the magnetic pole base 21 from affecting the deformation of the control valve plate 11.

[0148] In addition, it should be explained here that the magnetic pole body in the present invention is a higher-level concept. Although the magnetic pole protrusion 22 and the magnetic pole base 21 are two component names here, in general design, the magnetic pole protrusion 22 and the magnetic pole base 21 are an integrated structure. The disassembly description here is only for the convenience of statement.

[0149] A lateral channel 23 is provided on the magnetic pole base 21, which connects the connecting channel 24 with the pilot oil outlet B. This design allows oil to flow from the connecting channel 24 through the lateral channel 23 to the pilot oil outlet B, thereby achieving flow path control of the oil.

[0150] The pressing protrusion 32 in the pilot valve core 3 is inserted into the end of the connecting channel 24 ; the contact and cooperation between the pressing protrusion 32 and the front magnetic pole 2 can achieve sealing and oil flow control.

[0151] In the present invention, the solenoid valve also includes a pilot elastic unit and a main valve elastic unit; the main valve elastic unit includes a main valve spring; one end of the main valve spring is connected to the main valve piston 9, and the other end is connected to the circulation mechanism, and the pilot elastic unit includes a pilot spring 5; one end of the pilot spring 5 is connected to the pilot valve core 3, and the other end is connected to the circulation mechanism; the pilot spring 5 provides elastic support for the pilot valve core 3, so that it remains in the initial position when there is no external force.

[0152] When the solenoid valve is powered off or the electromagnetic force disappears, the pilot spring 5 can reset the pilot valve core 3 to its initial position, ensuring that the system returns to normal.

[0153] The pilot spring 5 can absorb the impact force generated by the pilot valve core 3 during movement, reduce vibration and noise, and improve the stability and service life of the system.

[0154] At the same time, it provides sealing support force. When the solenoid valve is powered off or the electromagnetic force disappears, the pilot spring 5 can be supported to press the pilot spring 5 so that it fits tightly on the front magnetic pole 2.

[0155] The main valve spring provides elastic support for the main valve piston 9 so that the main valve piston 9 remains in its initial position when no external force is applied.

[0156] When the external force disappears, the main valve spring can reset the main valve piston 9 to its initial position, ensuring that the system returns to normal.

[0157] The main valve spring can absorb the impact force generated by the main valve piston 9 during movement, reduce vibration and noise, and improve the stability and service life of the system.

[0158] In addition, in the present invention, the main valve spring and the pilot spring 5 are generally selected to be coil springs.

[0159] An electronically controlled hydraulic shock absorber includes the solenoid valve; the electronically controlled hydraulic shock absorber includes a power-on working mode and a power-off working mode; the power-on working mode is: the solenoid valve controls the pressure value of the hydraulic oil flowing through the solenoid valve according to the working current received by the coil unit in the solenoid valve; the power-off working mode is: the solenoid valve controls the pressure value of the hydraulic oil flowing through the solenoid valve according to the deformation of the control valve plate 11.

[0160] The electronically controlled hydraulic shock absorber works in two modes. The first mode is the normal working mode. In the normal working mode, the solenoid valve receives the required current signal from the controller. The working current received by the solenoid valve determines the pressure value of the shock absorber oil flowing through the solenoid valve. Generally, the greater the current, the greater the pressure difference, and the greater the shock absorber damping force. Conversely, the smaller the pressure difference, the smaller the shock absorber damping force.

[0161] The second mode is the safe working mode, that is, the power-off working mode. The safe working mode is the working state when the solenoid valve does not receive the current signal from the controller. Usually, when the solenoid valve is in the safe working mode, the damping force of the shock absorber is maintained at an intermediate level. Specific embodiment:

[0163] The present invention belongs to the technical field of variable damping shock absorbers, and in particular relates to a pilot valve assembly, a valve body unit having the pilot valve assembly, a solenoid valve, and an electronically controlled hydraulic shock absorber.

[0164] The present invention increases the pressure sealing surface 34 on the pilot valve core 3 , thereby ensuring the sealing performance of the connection between the pilot valve core 3 and the front magnetic pole 2 and reducing the manufacturing precision requirement of the pilot valve core 3 .

[0165] At the same time, the present invention increases the flow groove A on the inner wall of the pilot housing 4 or the outer side of the pilot valve core 3; such an arrangement can reduce the risk of the solenoid valve being stuck.

[0166] In the present invention, the flow groove A can be provided on the side of the pilot valve core 3 , and more preferably, on the inner wall of the pilot housing 4 that cooperates with the pilot valve core 3 .

[0167] In the present invention, the solenoid valve includes an electromagnetic drive assembly and the valve body unit; the electromagnetic drive assembly includes an electromagnetic unit and a coil unit; the valve body unit includes a hydraulic unit and a valve plate unit; the hydraulic unit includes a main valve assembly and the pilot valve assembly.

[0168] The pressure difference and flow rate of the main valve assembly are controlled by the pilot valve assembly.

[0169] There are two working conditions when the solenoid valve is working; when the power is off: after the oil enters from the oil inlet on the main valve seat 10, there are two flow paths. The first is to flow through the throttle port formed by the main valve seat 10 and the main valve piston 9 and then flow out from the main oil outlet D evenly distributed on the side of the pilot housing 4. The second is to flow through the overflow hole in the center of the main valve piston 9 into the interior of the connecting rod 8. A part of it enters the main valve cavity 412 from the flow metering holes evenly distributed on the side of the guide sleeve 7 of the connecting rod 8. A back pressure cavity of the main valve piston 9 is formed between the main valve piston 9 and the circulation mechanism. The oil flowing in through the flow metering holes also enters the back pressure cavity of the main valve piston 9; the other part passes through the connecting rod 8 and enters the pilot cavity 411 , and flows from the front cavity of the pilot valve core 3 into the rear cavity through the flow grooves A evenly distributed on the pilot housing 4. Here, the front cavity of the pilot valve core 3 and the rear cavity of the pilot valve core 3 are relative concepts; in essence, the pilot valve core 3 divides the pilot inner cavity 411 into two parts, the interval between the pilot valve core 3 and the flow mechanism is the front cavity of the pilot valve core 3; the interval between the pilot valve core 3 and the front magnetic pole 2 is the rear cavity of the pilot valve core 3; at this time, the outer conical surface of the pilot valve core 3 is in contact and sealed with the front magnetic pole 2 under the combined force of the liquid force and the pilot spring 5, and the armature push rod 1 is in contact and sealed with the end face of the pilot valve core 3 under the action of the armature spring, and the liquid pressure in the pilot inner cavity 411 continues to increase until the generated The liquid force is greater than the pre-tightening force of the control valve disc 11, and the control valve disc 11 is further deformed and breaks away from the pilot housing 4. The liquid enters the pilot oil outlet B formed by the pilot housing 4 and the electromagnetic housing 6 through the communication channel between the control valve disc 11 and the pilot housing 4, and finally flows back to the liquid reservoir; when power is turned on: after the oil enters the oil inlet of the solenoid valve, there are two flow paths. The first is to flow through the throttle port formed by the pilot housing 4 and the main valve piston 9 and then flow out from the holes evenly distributed on the side of the pilot housing 4. The second is to flow through the overflow hole in the center of the main valve piston 9 into the inside of the connecting rod 8. A part of it enters the back pressure chamber of the main valve piston 9 from the holes evenly distributed on the side of the guide sleeve 7 of the connecting rod 8, and the other part A part of it passes through the connecting rod 8 and enters the pilot inner cavity 411, and flows from the front cavity of the pilot valve into the rear cavity through the flow groove A evenly distributed on the pilot housing 4. At this time, when the combined force of the electromagnetic force and the armature spring force on the pilot valve core 3 is greater than the combined force of the liquid force and the pilot spring force on the pilot valve core 3, the conical surface of the pilot valve core 3 is disengaged from the front magnetic pole 2, and the armature push rod 1 is in contact and sealed with the end face of the pilot valve core 3 under the action of the armature spring. The liquid flows through the liquid gap formed between the conical surface of the pilot valve core 3 and the front magnetic pole 2 through the connecting channel 24 and the lateral channel 23 evenly distributed on the front magnetic pole 2 into the pilot oil outlet B formed by the pilot housing 4 and the electromagnetic housing 6, and finally flows back to the liquid storage cylinder.

[0170] The present invention has the following advantages:

[0171] The pilot valve core 3 and the front magnetic pole 2 are sealed by a conical surface. Compared with the flat surface seal, the conical surface seal has a better sealing effect. At the same time, the conical surface seal has relatively lower processing requirements and low assembly requirements.

[0172] When the power is off, the control valve plate 11 generates a pre-tightening force when assembled. The pre-tightening force can increase the opening pressure of the pilot valve core 3, and can achieve the performance of the solenoid valve when it is energized, thereby improving the performance of the shock absorber failure safety mode.

[0173] When the power is off, the gap between the pilot valve core 3 and the pilot housing 4 no longer serves as a passage for oil throttling, so the size of the gap does not need to be specially fine-machined, reducing the difficulty of machining.

[0174] At the same time, the oil flows through the specially designed flow groove A and no longer passes through the gap, so the risk of stagnation is also lower.

[0175] The oil flows from the front chamber of the pilot valve core 3 to the rear chamber through the uniformly distributed flow grooves A provided on the pilot housing 4. The flow is not affected by the movement of the pilot valve core 3, thereby effectively improving the response speed delay problem caused by the movement characteristics of the pilot valve core 3 being affected by the pressure of the front and rear chambers, ensuring that the pilot valve core 3 slides freely in the valve sleeve, and improving the working performance of the variable damping shock absorber solenoid valve.

[0176] Example 1:

[0177] A solenoid valve includes an electromagnetic drive assembly and a valve body unit; the electromagnetic drive assembly includes an electromagnetic unit and a coil unit; the valve body unit includes a hydraulic unit and a valve plate unit; the hydraulic unit includes a main valve assembly and the pilot valve assembly;

[0178] Specifically include:

[0179] Pilot housing 4, main valve piston 9, main valve seat 10, main valve spring, connecting rod 8, guide sleeve 7, pilot spring 5, pilot valve core 3, control valve plate 11, front magnetic pole 2 and armature push rod 1, etc.

[0180] The pilot valve core 3 slides in the pilot housing 4 under the combined action of electromagnetic force, pilot spring force, armature spring force and liquid force, approaching or moving away from the connecting rod 8, thereby changing the size of the pilot valve opening; the inner side surface of the pilot valve core 3 forms a third sealing surface 343, the transverse end surface 341 is the first sealing surface, and the frustum annular surface 342 is the second sealing surface.

[0181] When power is on, the third sealing surface 343 contacts the connecting rod 8, and the first sealing surface contacts the armature push rod 1; when power is off, the pilot valve core 3 and the end of the connecting rod 8 form a pilot valve circulation channel, and the conical sealing surface of the pilot valve core 3 is away from the connecting rod 8 and abuts against the front magnetic pole 2 under the action of the pilot spring 5, and the armature push rod 1 contacts and seals with the first sealing surface under the action of the armature spring; the control valve plate 11 is arranged on the front magnetic pole 2, and produces elastic deformation under the pressure of the pilot housing 4, contacts and seals with the pilot housing 4, and generates a certain pre-tightening force to seal, the pilot valve core 3 and the pilot housing 4 are clearance-fitted, and a circulation groove A for the circulation of the pilot oil is designed on the circumferential surface of the pilot valve core 3 and the pilot housing 4.

[0182] The motion guide of the connecting rod 8 is formed by the clearance fit between it and the center hole of the guide sleeve 7. The connecting rod 8 of the main valve spring-connecting rod 8 assembly slides in the connecting rod 8 guide sleeve 7, and the pre-tightened spring lock end of the main valve spring-connecting rod 8 assembly abuts against the main valve piston 9; the third sealing surface 343 on the pilot valve core 3 and the end of the connecting rod 8 form a pilot valve flow channel; the connecting rod 8 connects the pilot inner cavity 411 and the main valve cavity, and directly transmits the liquid force generated by the pilot inner cavity 411 to the main valve piston 9.

[0183] There is an overflow hole channel in the center of the main valve piston 9, and a connecting rod channel 82 and a connecting rod side channel 83 on the side of the connecting rod 8. The center of the connecting rod channel 82 is designed as a through hole. These channels connect the back pressure chamber of the main valve piston 9 with the pilot part, so that the liquid force of the pilot inner chamber 411 can be transmitted to the back pressure chamber of the main valve piston 9.

[0184] The movement guide of the main valve piston 9 is formed by the gap between it and the inner diameter of the pilot housing 4. The main valve piston 9 slides in the pilot housing 4 under the action of liquid force, moving away from or close to the main valve seat 10, changing the size of the main valve opening.

[0185] When the solenoid valve is working, the pilot valve core 3 will move in the pilot housing 4 due to the action of multiple forces such as liquid force, pilot spring force, electromagnetic force, armature spring force, etc. When the pilot valve core 3 moves, the oil will flow from the front chamber of the pilot valve core 3 to the rear chamber.

[0186] The pilot valve core 3 and the front magnetic pole 2 are sealed by a conical surface, and the sealing performance is less affected by processing and assembly.

[0187] When the power is off, the control valve plate 11 generates a pre-tightening force when assembled. The pre-tightening force can increase the opening pressure of the pilot valve core 3, and can achieve the performance of the solenoid valve when it is energized, thereby improving the performance of the shock absorber failure safety mode.

[0188] When the power is off, the throttling is done by the gap formed by the deformation of the control valve disc 11 and the pilot housing 4. The curve characteristics of the inlet and outlet pressure difference changing with the flow rate are consistent with those when energized, which improves the availability of the fail-safe mode; and the throttling method based on the gap between the pilot valve core 3 and the pilot housing 4 is changed, and the gap can be appropriately increased, thereby reducing the possibility of impurities getting stuck in the gap.

[0189] The oil flows from the front cavity of the pilot valve core 3 to the rear cavity through the uniformly distributed holes set on the pilot housing 4. The flow is not affected by the movement of the pilot valve core 3, thereby effectively improving the response speed delay problem caused by the influence of the front and rear cavity pressure on the pilot valve movement characteristics, ensuring that the pilot valve core 3 slides freely in the valve sleeve, and improving the working performance of the variable damping shock absorber solenoid valve.

[0190] The solenoid valve of the present invention is divided into two working conditions when working;

[0191] During a power outage Figure 3 : After the oil enters the oil inlet E of the solenoid valve, there are two flow paths. The first is to flow through the throttle port formed by the main valve seat 10 and the main valve piston 9 and then flow out from the main oil outlet D evenly distributed on the side of the pilot housing 4. The second is to flow through the overflow hole in the center of the main valve piston 9 into the connecting rod 8. A part of it enters the back pressure cavity of the main valve piston 9 from the evenly distributed holes on the side of the guide sleeve 7, and the other part passes through the connecting rod 8 into the pilot inner cavity 411, and flows from the front cavity of the pilot valve into the rear cavity through the evenly distributed flow grooves A on the pilot housing 4. At this time, the cone surface of the pilot valve core 3 is in the liquid The force of the control valve disc 11 is greater than the pre-tightening force of the control valve disc 11, and the control valve disc 11 is further deformed and breaks away from the contact with the pilot housing 4. The liquid enters the pilot oil outlet B formed by the pilot housing 4 and the electromagnetic housing 6 through the gap between the control valve disc 11 and the pilot housing 4, and finally flows back to the liquid storage cylinder C.

[0192] When the power is off, the throttling is done by the gap formed by the deformation of the control valve disc 11 and the pilot housing 4. The curve characteristics of the inlet and outlet pressure difference changing with the flow rate are consistent with those when energized, which improves the availability of the fail-safe mode; and the throttling method based on the gap between the pilot valve core 3 and the pilot housing 4 is changed, and the gap can be appropriately increased, thereby reducing the possibility of impurities being stuck in the gap; when the power is on, Figure 4: After the oil enters the oil inlet E of the solenoid valve, there are two flow paths. The first is to flow through the throttle port formed by the main valve seat 10 and the main valve piston 9 and then flow out from the main oil outlet D evenly distributed on the side of the pilot housing 4. The second is to flow through the overflow hole in the center of the main valve piston 9 into the connecting rod 8. Part of it enters the back pressure cavity of the main valve piston 9 from the evenly distributed holes on the side of the guide sleeve 7 of the connecting rod 8, and the other part passes through the connecting rod 8 into the pilot inner cavity 411. The main valve and the pilot valve are connected through the connecting rod 8, which can directly transmit the liquid force of the pilot valve to the main valve, thereby improving the inlet and outlet pressure difference of the solenoid valve at low speed and large current.

[0193] The oil then flows from the front chamber of the pilot valve into the rear chamber through the oil grooves A evenly distributed on the pilot housing 4. The flow is not affected by the movement of the pilot valve core 3, thereby effectively improving the response speed delay problem caused by the influence of the front and rear chamber pressure on the pilot valve movement characteristics, ensuring that the pilot valve core 3 slides freely in the valve sleeve, and improving the working performance of the variable damping shock absorber solenoid valve.

[0194] At this time, when the combined force of the electromagnetic force and the armature spring force on the pilot valve core 3 is greater than the combined force of the liquid force and the pilot spring force on the pilot valve core 3, the conical surface of the pilot valve core 3 is out of contact with the front magnetic pole 2, and the push rod 1 is in contact and sealed with the end face of the pilot valve core 3 under the action of the armature spring. The liquid flows through the channel formed between the conical surface of the pilot valve core 3 and the front magnetic pole 2 through the flow holes evenly distributed on the front magnetic pole 2 into the pilot oil outlet B formed by the pilot housing 4 and the electromagnetic housing 6, and finally flows back to the liquid storage cylinder C.

[0195] Obviously, the specific implementation of the present invention is not limited to the above-mentioned methods. As long as various non-substantial improvements are made using the method concept and technical solution of the present invention, they are all within the scope of protection of the present invention.

Claims

1. A pilot valve assembly, characterized in that: It comprises a pilot valve core (3); the pilot valve core (3) comprises a valve core body (31); the valve core body (31) is provided with a pressing protrusion (32) for pressing and matching with the front magnetic pole (2).

2. A pilot valve assembly according to claim 1, characterized in that: The outer side surface of the pressing protrusion (32) away from the valve core body (31) is a pressing sealing surface (34); the pressing sealing surface (34) is a conical surface or an arc surface.

3. A pilot valve assembly according to any one of claims 1-2, characterized in that: An installation recess (33) is provided at one end of the valve core body (31) away from the pressing protrusion (32).

4. A valve unit, characterized in that: It comprises a hydraulic unit and a valve plate unit; the hydraulic unit comprises a main valve assembly and a pilot valve assembly according to any one of claims 1 to 3; the pilot valve assembly is arranged in the main valve assembly; the valve plate unit is arranged on the main valve assembly; The main valve assembly includes a pilot housing (4); an oil channel (41) is provided on the pilot housing (4); the valve plate unit includes a control valve plate (11); the control valve plate (11) is arranged at the end of the pilot housing (4); the control valve plate (11) is capable of deformation; After the control valve plate (11) is deformed, a communication channel is formed between the control valve plate (11) and the pilot housing (4); the pilot valve core (3) in the pilot valve assembly is capable of moving within the pilot housing (4).

5. A valve body unit according to claim 4, characterized in that: The valve body unit further comprises a communication mechanism provided between the pilot valve core (3) and the pilot housing (4); the communication mechanism comprises a flow groove provided on the pilot valve core (3) and / or the pilot housing (4); the flow groove is used for oil to flow from the area between the pilot valve core (3) and the pilot housing (4) to the control valve plate (11).

6. The valve body unit according to claim 4, characterized in that: The pilot valve assembly further includes a circulation mechanism; the circulation mechanism divides the oil channel into a pilot inner cavity (411) and a main valve inner cavity (412); The circulation mechanism includes a connecting rod (8); the connecting rod (8) includes a connecting rod (8) body; the connecting rod (8) body is provided with a connecting rod channel and a connecting rod side channel; The connecting rod channel is in communication with the pilot inner cavity (411); the connecting rod channel is in communication with the main valve inner cavity (412) via a connecting rod side channel.

7. The valve unit according to claim 6, characterized in that: The circulation mechanism further comprises a guide sleeve (7), and the connecting rod (8) is arranged in the pilot housing (4) through the guide sleeve (7).

8. The valve unit according to claim 4, characterized in that: The pilot housing (4) is provided with a limiting recess (42) at its end; the control valve disc (11) is arranged in the limiting recess (42); a pilot oil outlet (B) is provided on the pilot housing (4); the limiting recess (42) is communicated with the pilot oil outlet (B); and after the control valve disc (11) is deformed, the communication channel is communicated with the pilot oil outlet (B).

9. A solenoid valve for a variable damping shock absorber, characterized in that: It comprises an electromagnetic drive assembly and a valve body unit according to any one of claims 4 to 8; The electromagnetic drive assembly includes an electromagnetic unit and a coil unit; The electromagnetic unit comprises an electromagnetic housing (6), an armature assembly is arranged in the electromagnetic housing (6), and the armature assembly comprises an armature body and an armature push rod (1) connected to the armature body; the armature push rod (1) can pass through the control valve plate (11) and contact the pilot valve core (3); The coil unit can drive the armature assembly to move axially along the armature push rod (1); the armature push rod (1) can push the pilot valve core (3) in the pilot valve assembly to move; The electromagnetic housing (6) is connected to the pilot housing (4); the pilot valve assembly and the armature push rod (1) are arranged opposite to each other; The main valve assembly further comprises a main valve piston (9) arranged in a pilot housing (4); a main valve seat (10) is provided at the end of the pilot housing (4); The main valve piston (9) and the armature assembly are respectively distributed at both ends of the pilot valve assembly; The main valve piston (9) is distributed in the area between the main valve seat (10) and the pilot valve assembly; The pilot housing (4) is provided with a pilot oil outlet (B) and a main oil outlet (D); the pilot oil outlet (B) is distributed at one end of the pilot housing (4) close to the armature assembly; the main oil outlet (D) is distributed at one end of the pilot housing (4) close to the main valve seat (10); The pilot valve core (3) is located in a pilot inner cavity (411) in the oil channel; and the main valve piston (9) is arranged in a main valve inner cavity (412) in the oil channel.

10. The solenoid valve according to claim 9, characterized in that: The control valve plate (11) is connected to the electromagnetic housing (6) via a magnetic pole structure; the magnetic pole structure includes a front magnetic pole (2) arranged in the electromagnetic housing (6); the control valve plate (11) is connected to the electromagnetic housing (6) via the front magnetic pole (2).

11. The solenoid valve according to claim 10, characterized in that: The front magnetic pole (2) includes a magnetic pole body; a through-connection channel (24) is provided on the magnetic pole body; the armature push rod (1) is arranged through the front magnetic pole (2); a liquid flow gap is provided between the armature push rod (1) and the through-connection channel (24); the magnetic pole body includes a magnetic pole base; a magnetic pole protrusion is provided on the magnetic pole base; the control valve plate (11) is connected to the magnetic pole protrusion; a lateral channel (23) is provided on the magnetic pole base, and the through-connection channel (24) is connected to the pilot oil outlet (B) through the lateral channel (23); the pressing protrusion (32) in the pilot valve core (3) is inserted into the end of the through-connection channel (24).

12. The solenoid valve according to claim 9, characterized in that: The solenoid valve further comprises a pilot elastic unit and a main valve elastic unit; the main valve elastic unit comprises a main valve spring; one end of the main valve spring is connected to the main valve piston (9), and the other end is connected to the circulation mechanism; the pilot elastic unit comprises a pilot spring (5); one end of the pilot spring (5) is connected to the pilot valve core (3), and the other end is connected to the circulation mechanism.

13. An electronically controlled hydraulic shock absorber, characterized in that: comprising the solenoid valve according to any one of claims 9 to 12; The electronically controlled hydraulic shock absorber includes a power-on working mode and a power-off working mode; The power-on working mode is: the solenoid valve controls the pressure value of the hydraulic oil flowing through the solenoid valve according to the working current received by the coil unit in the solenoid valve; The power-off working mode is that the solenoid valve controls the pressure value of the hydraulic oil flowing through the solenoid valve according to the deformation of the control valve plate (11).

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