A solenoid valve

Abstract

This application provides a solenoid valve, comprising a housing, a valve sleeve, a main valve assembly, a pilot valve assembly, and a drive mechanism: the valve sleeve is axially connected to the housing; the main valve assembly is located on the side of the valve sleeve away from the housing and has an axially penetrating oil inlet; the pilot valve assembly is located on the side of the valve sleeve close to the housing and includes a first valve core, a pilot-operated axially arranged first valve core, and a second valve core, the pilot-operated axially arranged first and second valve cores, the pilot-operated axially applied to the first and second valve cores; the first valve core has an oil outlet; the second valve core is sleeved on the first valve core and located at the oil outlet end of the oil inlet; the drive mechanism is located inside the housing and is used to apply an axial force to the pilot valve assembly to adjust the flow area of ​​the second valve core relative to the oil inlet. In this application, the force can be transmitted to the second valve core, requiring only a small force for displacement, enabling the pilot valve assembly to respond quickly and improving the response speed and sensitivity of the solenoid valve.

Description

Technical Field

[0001] This application relates to the field of vehicle shock absorption device technology, specifically to a solenoid valve. Background Technology

[0002] The solenoid valve of an automotive shock absorber is used to actively adjust the damping force of the shock absorber in real time according to the instructions of the electronic control unit. It includes an electromagnetic drive mechanism, a pilot valve core, and a main valve core. There is an oil passage between the pilot valve core and the main valve core for the fluid to pass through. The electromagnetic drive mechanism is located on the side of the pilot valve core away from the main valve core. The electromagnetic drive mechanism is used to drive the axial displacement of the pilot valve core, change the size of the oil passage, and change the flow speed of the oil, thereby realizing the flow damping control of the oil inside the shock absorber, so that the suspension system can dynamically adapt to different road conditions and driving states.

[0003] In existing shock absorber solenoid valves, a spring is installed between the pilot valve core and the main valve core. The electromagnetic drive mechanism acts directly on the pilot valve core, causing it to overcome the spring pressure and move towards the main valve core, thereby changing the size of the oil passage through which the oil is supplied. However, in this structure, the pilot valve core needs to simultaneously meet the requirements of both fully open and fully closed oil passages. That is, when the pilot valve core has the largest displacement, it needs to completely close the oil passage through which the oil is supplied between the pilot valve core and the main valve core. Therefore, the pilot valve core is set to be relatively large, so that the oil passage can be fully closed while ensuring an appropriate displacement. In this way, when the pilot valve core is displaced, it not only needs to overcome the spring pressure but also needs to move as a whole. This increases the driving force required for the pilot valve core to move, increasing the response force required by the pilot valve core, thereby reducing the response sensitivity and response speed, resulting in vehicle body control lag and reducing vehicle comfort.

[0004] Therefore, the solenoid valves of existing automotive shock absorbers have room for further improvement. Summary of the Invention

[0005] In view of this, and addressing the technical problem in the prior art automotive shock absorber solenoid valves where the pilot valve core has a large volume and mass, and needs to overcome spring pressure displacement, which reduces response speed and sensitivity, this application provides a solenoid valve whose pilot valve assembly includes a first valve core and a second valve core. An elastic element is provided between the first valve core and the second valve core. The second valve core is located close to the main valve core. When the first valve core is acted upon by the drive mechanism, under the action of the elastic element, the first valve core can transmit the force to the second valve core. This allows the drive mechanism to operate the pilot valve assembly with only a small amount of force, thereby improving the response speed and sensitivity of the solenoid valve.

[0006] This application provides a solenoid valve, comprising: case; The valve sleeve is axially connected to the housing; The main valve assembly is located on the side of the valve sleeve away from the housing and has an axially penetrating oil inlet hole; A pilot valve assembly is located on the side of the valve sleeve near the housing; it includes a first valve core, a pilot-operated axial element, and a second valve core arranged sequentially along the axial direction. The pilot-operated axial element is used to apply axial force to the first valve core and the second valve core; the first valve core is provided with an oil outlet hole; the second valve core is sleeved on the first valve core and located at the oil outlet end of the oil inlet hole. The drive mechanism, located inside the housing, is used to apply axial force to the pilot valve assembly to adjust the flow area of ​​the second valve core relative to the oil inlet.

[0007] Compared with the prior art, in the solenoid valve of this application, the pilot valve assembly includes a first valve core and a second valve core, which are coaxially arranged. The second valve core is sleeved on the first valve core, and a pilot-operated elastic element is provided between the first and second valve cores. This pilot-operated elastic element acts between the first and second valve cores, applying an axial force to both valve cores, thereby enabling both valve cores to move axially. On the one hand, when the drive mechanism applies an axial force to the first valve core, the pilot-operated elastic element allows the first valve core to transmit the force to the second valve core. Since the second valve core is smaller, the drive mechanism requires only a smaller operating force. The second valve core can be displaced by applying force, reducing the force required for response and enabling the pilot valve assembly to respond quickly, thus improving the response speed and sensitivity of the solenoid valve. On the other hand, compared with the single-unit pilot valve core in the prior art, the split pilot valve assembly in this application includes two valve cores. The two valve cores can achieve the function of a single-unit pilot valve core when working together, and both are smaller in volume than the single-unit pilot valve core in the prior art. The response driving force required for the second valve core or the first valve core is smaller, and the force required to overcome the spring displacement is smaller. Therefore, the response driving force of the pilot valve core is further reduced, and the response speed of the pilot valve assembly is faster and more sensitive.

[0008] Preferably, the first valve core includes: The first valve core base has an oil outlet located on it. The first valve core column is coaxially disposed on the side of the first valve core base near the second valve core, and its outer diameter is smaller than that of the first valve core base and larger than that of the oil inlet hole. The valve sleeve and the housing are provided with an oil outlet gap, which is connected to the oil outlet hole.

[0009] Preferably, the first valve core further includes: An annular protrusion is located on the side of the first valve core base away from the first valve core column, and protrudes axially in a direction away from the first valve core column; The slot is located on the annular protrusion and penetrates the annular protrusion radially. A guide cylinder is located on the side of the first valve core base facing the first valve core column; A support ring is located on the side of the first valve core base away from the first valve core column, and protrudes axially in a direction away from the first valve core column; Wherein, the outer diameter of the support ring is smaller than the inner diameter of the annular protrusion, the inner diameter of the guide cylinder is larger than the outer diameter of the first valve core column, the outer diameter of the first valve core base is larger than the outer diameter of the first valve core column, and the outer walls of the annular protrusion, the first valve core base, and the guide cylinder are on the same axial plane.

[0010] Preferably, the pilot spring is a cylindrical spring, the inner diameter of the pilot spring is larger than the inner diameter of the second valve core, and the outer diameter of the pilot spring is smaller than or equal to the outer diameter of the second valve core. or, The pre-launching component is a shrapnel, and the pre-launching component includes: The inner ring is fitted around the first valve core column, and its inner diameter is larger than the outer diameter of the first valve core column. The outer ring is fitted outside the inner ring and is coaxially arranged with the inner ring. Its outer diameter is smaller than the inner diameter of the first valve core base. Connecting arms, at least two in number, are spaced apart along the outer circumference of the inner ring and are used to connect the inner ring and the outer ring.

[0011] Preferably, the first valve core base is provided with a limiting protrusion on the side facing the first tactile component, and the limiting protrusion protrudes towards the side closer to the second valve core; Among them, the outer diameter of the limiting protrusion is smaller than the outer diameter of the outer ring, and the inner diameter of the limiting protrusion is larger than the inner diameter of the outer ring.

[0012] Preferably, the second valve core includes: Core tube, cylindrical structure, adapted to the first valve core column; The second valve core base is coaxially arranged with the core cylinder and located on the side of the core cylinder away from the first valve core column; A buffer ring groove is located at the connection between the core cylinder and the second valve core base, and is recessed radially away from the first valve core column.

[0013] Preferably, the main valve assembly includes: The main valve core is located in the main valve chamber; The main valve seat is located between the main valve core and the second valve core and is axially fixedly connected to the valve sleeve. The main valve spring is located between the main valve seat and the main valve core, and is used to apply axial force to the main valve seat and the main valve core. The first elastic element is disposed between the main valve seat and the second valve core, and is used to apply an axial force to the second valve core; the stiffness of the first elastic element is greater than that of the first elastic element. The oil inlet is located on the main valve seat.

[0014] Preferred options also include: The second elastic element is located between the main valve seat and the main valve spring; And / or, The limiting oil ring is located on the side of the main valve seat facing the second valve core, and is wrapped around the outside of the oil inlet hole, protruding towards the side closer to the second valve core. The mounting ring is located on the side of the main valve seat facing the second valve core, and is fitted over the limiting oil ring, protruding towards the side closer to the second valve core; Among them, the inner diameter of the mounting convex ring is larger than the outer diameter of the limiting oil ring, and the outer diameter of the limiting oil ring is smaller than the outer diameter of the second valve core; Along the axial direction, the distance between the limiting oil ring and the second valve core is greater than the distance between the mounting convex ring and the second valve core.

[0015] Preferably, the drive mechanism includes: The magnetic tube is located inside the housing; The slider is located inside the magnetic tube; The mounting base is located on the side of the slider near the pilot valve assembly; The push rod, at least partially located within the slider and at least partially passing through the mounting base, acts on the pilot valve assembly. The driving elastic element is sleeved outside the push rod and is used to apply axial force to the mounting base and the slider; The outer diameter of the push rod is equal to the outer diameter of the first valve core column.

[0016] Preferred options also include: The first flow passage extends axially through the first valve core; The second flow passage penetrates the second valve core axially; The third flow passage is located on the push rod and is coaxially arranged and connected with the first flow passage and the second flow passage. The first, second, and third flow holes have the same inner diameter, and the diameter of the largest opening of the second flow hole facing the limiting oil ring is less than or equal to the inner diameter of the limiting oil ring. Attached Figure Description

[0017] Figure 1 This is a partial three-dimensional structural schematic diagram of a solenoid valve provided in an embodiment of this application; Figure 2 This is a partial cross-sectional view of a solenoid valve provided in one embodiment of this application. Figure 1 ; Figure 3 This is a partial cross-sectional view of a solenoid valve provided in one embodiment of this application. Figure 2 ; Figure 4 This is a schematic diagram of a partial explosion structure provided in an embodiment of this application; Figure 5 yes Figure 2 A magnified schematic diagram of part A.

[0018] Reference numerals: 1. Housing; 2. Valve sleeve; 3. Main valve assembly; 4. Pilot valve assembly; 5. Drive mechanism; 31. Main valve core; 32. Main valve seat; 33. Main valve spring; 34. First elastic element; 35. Second elastic element; 36. Bottom valve seat; 321. Oil inlet; 322. Limiting oil ring; 323. Mounting convex ring; 41. First valve core; 42. Second valve core; 43. First-strike ferrule; 411. First valve core base; 412. First valve core column; 413. Oil outlet; 414. Annular protrusion; 415. Groove; 416. Guide cylinder; 417. Support ring; 418. First flow hole; 419. Limiting protrusion; 421. Core cylinder; 422. Second valve core base; 423. Buffer ring groove; 424. Second flow passage; 431. Inner ring; 432. Outer ring; 433. Connecting arm; 51. Magnetic tube; 52. Mounting base; 53. Push rod; 54. Drive elastic element; 55. Slider; 531. Third flow hole. Detailed Implementation

[0019] To enable those skilled in the art to better understand the technical solutions of this disclosure, the following detailed, clear, and complete description of this disclosure is provided in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of this disclosure and are not intended to limit it.

[0020] In the description of this application, the use of "first" and "second" is for the purpose of distinguishing technical features only, and should not be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated or the order of the technical features indicated.

[0021] Those skilled in the art should understand that in the disclosure of this application, the terms "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, the above terms should not be construed as limitations on this application.

[0022] The present application will now be described in further detail with reference to the accompanying drawings, see below. Figures 1 to 5 illustrate.

[0023] like Figures 1 to 4 As shown, this application provides a solenoid valve, which includes a housing 1, a valve sleeve 2, a main valve assembly 3, a pilot valve assembly 4, and a drive mechanism 5. The housing 1 and the valve sleeve 2 are connected axially, and the bottom of the housing 1 is connected to the top of the valve sleeve 2. An oil outlet gap is provided between the housing 1 and the valve sleeve 2. The drive mechanism 5 is located inside the housing 1. The valve sleeve 2 is provided with a pilot valve chamber and a main valve chamber, which are distributed axially. The pilot valve chamber is located at the upper end of the main valve chamber and is used to install the pilot valve assembly 4. The pilot valve chamber is connected to the oil outlet gap. The main valve chamber is used to install the main valve assembly 3. The drive mechanism 5, the pilot valve assembly 4, and the main valve assembly 3 are arranged sequentially from top to bottom axially.

[0024] like Figure 2 As shown, the main valve assembly 3 is provided with an oil inlet 321, and the pilot valve assembly 4 is provided with an oil outlet 413. Oil flows from the main valve chamber into the pilot valve chamber through the oil inlet 321, and then flows from the pilot valve chamber to the oil outlet gap, thus flowing out of the oil outlet gap. The pilot valve assembly 4 is located above the oil inlet 321. The drive mechanism 5 can drive the pilot valve assembly 4 to move axially to block the oil inlet 321 or move away from the oil inlet 321, thereby changing the communication relationship between the pilot valve chamber and the main valve chamber, and thus changing the damping force of the solenoid valve.

[0025] Specifically, a detailed description of pilot valve assembly 4 is provided; such as Figures 2 to 4As shown, the pilot valve assembly 4 includes a first valve core 41, a pilot-operated flexural element 43, and a second valve core 42, which are arranged coaxially and sequentially along the axial direction. The pilot-operated flexural element 43 acts between the first valve core 41 and the second valve core 42, and is used to decompose and transfer the force on the first valve core 41 to the second valve core 42, or to decompose and transfer the force on the second valve core 42 to the first valve core 41. The first valve core 41 includes a first valve core base 411 and a first valve core column 412 arranged coaxially. The first valve core base 411 has a disc structure, and the first valve core column 412 has a columnar structure. The outer diameter of the first valve core column 412 is smaller than the outer diameter of the first valve core base 411. The first valve core base 411 is provided with an axially penetrating oil outlet hole 413. The second valve core 42 is slidably sleeved on the first valve core column 411. 2. The second valve core 42 is located at the oil outlet end of the oil inlet 321. By changing the distance between it and the oil inlet 321, the flow area of ​​the oil inlet 321 can be adjusted. The end of the first valve core base 411 away from the first valve core column 412 interacts with the drive mechanism 5, and the end of the second valve core 42 away from the first valve core 41 interacts with the main valve assembly 3. The drive mechanism 5 can apply an axial force to the first valve core 41 to drive the first valve core 41 to move axially. The first valve core 41 first transmits the force to the pilot valve component 43. The second valve core 42 moves under the force of the pilot valve component 43, and can move away from or closer to the oil outlet of the main valve assembly 3, changing the oil circuit opening and closing and the oil flow size between the main valve assembly 3 and the pilot valve assembly 4, thereby adjusting the damping force of the solenoid valve.

[0026] In this embodiment, compared to the existing single-unit pilot valve core integral drive, the split pilot valve assembly 4 of this application includes two valve cores. With the cooperation of the two valve cores, the function of a single-unit pilot valve core can be realized. Moreover, the individual volume of both is smaller than that of the single-unit pilot valve core of the prior art. The response driving force required by the second valve core 42 or the first valve core 41 is smaller, and the force required to overcome the spring displacement is smaller. Therefore, the response driving force of the pilot valve core is further reduced, and the response speed of the pilot valve assembly 4 is faster and more sensitive.

[0027] In addition, when the drive mechanism 5 applies an axial force to the first valve core 41, the first valve core 41 can transmit the force to the second valve core 42 through the action of the pilot valve component 43. The second valve core 42 has a smaller volume, so the drive mechanism 5 only needs a small force to drive the second valve core 42 to move. The displacement of the second valve core 42 can directly control whether the oil circuit between the pilot valve assembly 4 and the main valve assembly 3 is connected and adjust the size of the oil circuit. Therefore, the force required for the pilot valve assembly 4 to respond is reduced, enabling the pilot valve assembly 4 to respond quickly and improving the response speed and response sensitivity of the solenoid valve.

[0028] Specifically, in this application, a pilot-action element 43 is provided between the first valve core 41 and the second valve core 42. When the first valve core 41 is subjected to the axial driving force of the drive mechanism 5, the force on the first valve core 41 is first transmitted to the second valve core 42 through the pilot-action element 43, and the second valve core 42 is displaced by the force transmitted by the pilot-action element 43. In this process, assuming that the force applied by the drive mechanism 5 is F1, after F1 is transmitted to the first valve core 41, it bears F11 alone and transmits F12 to the pilot-action element 43. Due to the elastic structural characteristics of the pilot valve assembly 43, the pilot valve component 43 decomposes part of the force in F12. That is, the pilot valve component 43 bears the force of F121 and transmits the force of F122 to the second valve core 42. The second valve core 42 is displaced under the action of the force of F122. The advantage of this force decomposition is that the force transmission of the entire pilot valve assembly 4 is step-by-step and gradual. This prevents the pilot valve assembly 4 from undergoing abrupt changes after being driven by the drive mechanism 5, avoids collision between the pilot valve assembly 4 and the main valve assembly 3, and ensures the smoothness of the damping adjustment.

[0029] Wherein, F1=F11+F12=F11+F121+F122. Therefore, the pilot valve assembly 4 of this application can respond with a smaller force from the drive mechanism 5, improving the response speed and response sensitivity, and can also avoid nonlinear and abrupt changes, ensuring the smoothness of the response of the pilot valve assembly 4, thereby further improving the comfort of vehicle use.

[0030] Furthermore, for the first valve core base 411, oil outlet holes 413 are equidistantly spaced along the same circumference, and the oil outlet holes 413 are arranged around the outer circumference of the first valve core column 412; such as Figures 2 to 4 As shown, the upper surface of the first valve core base 411 is provided with an annular protrusion 414 and a support ring 417. That is, the annular protrusion 414 and the support ring 417 are both located on the side of the first valve core base 411 away from the first valve core column 412. The support ring 417 and the annular protrusion 414 both protrude axially away from the first valve core column 412. The support ring 417 and the annular protrusion 414 are coaxially arranged. The inner diameter of the annular protrusion 414 is larger than the outer diameter of the support ring 417. The outer diameter of the support ring 417 is larger than the outer diameter of the drive rod of the drive mechanism 5. The support ring 417 is used to support the drive mechanism 5. When the oil passage at the top of the pilot valve assembly 4 is closed, the annular protrusion 414 provides a certain sealing effect on the outer periphery of the top of the first valve core 41.

[0031] like Figures 2 to 4As shown, under the action of the support ring 417 and the annular protrusion 414, a flow-through annular groove is formed between the annular protrusion 414 and the support ring 417, which reduces the probability of oil contacting the drive mechanism 5. The annular protrusion 414 has a slot 415 that radially penetrates the annular protrusion 414. There are two slots 415, spaced apart along the circumferential wall of the annular protrusion 414, for oil to pass through. The presence of the flow-through annular groove and the slot 415 effectively prevents the first valve core base 411 from being too tightly pressed against the upper housing 1 when it rises to the top under the action of oil, making it difficult to separate and affecting the use of the solenoid valve, thus ensuring the responsiveness of the pilot valve assembly 4.

[0032] like Figures 2 to 4 As shown, a guide cylinder 416 is provided at the lower end of the first valve core base 411. That is, the guide cylinder 416 is located on the side of the first valve core base 411 facing the first valve core column 412. The guide cylinder 416 has a cylindrical structure, and the inner diameter of the guide cylinder 416 is larger than the outer diameter of the first valve core column 412. The outer walls of the annular protrusion 414, the first valve core base 411, and the guide cylinder 416 are on the same axial plane, that is, the axial outer walls of the annular protrusion 414, the first valve core base 411, and the guide cylinder 416 are flush. The guide cylinder 416 increases the contact area between the first valve core 41 and the valve sleeve 2, increases the axial length of the contact between the first valve core 41 and the valve sleeve 2, and thus ensures the stability of the first valve core 41 during axial displacement.

[0033] Furthermore, the second valve core 42 is described in detail; such as Figures 1 to 4 As shown, the second valve core 42 includes a core cylinder 421 and a second valve core base 422. The core cylinder 421 has a cylindrical structure, and the second valve core base 422 has a disc structure. The core cylinder 421 is sleeved on the top of the second valve core base 422. The second valve core base 422 and the core cylinder 421 are coaxially arranged. The inner diameter of the core cylinder 421 is equal to or slightly larger than the outer diameter of the first valve core column 412. The core cylinder 421 is sleeved on the first valve core column 412.

[0034] Among them, such as Figure 2 , Figure 3 As shown, the bottom of the inner wall of the core cylinder 421 is provided with a buffer ring groove 423. The buffer ring groove 423 is recessed radially outward, that is, the buffer ring groove 423 is provided in the connection between the core cylinder 421 and the second valve core base 422. It is recessed radially away from the first valve core column 412, thereby preventing the bottom of the first valve core column 412 from sticking to the top of the second valve core base 422.

[0035] Furthermore, the pilot spring 43 is described in detail; in an optional embodiment of this application, the pilot spring 43 is a cylindrical spring, the inner diameter of the pilot spring 43 is larger than the inner diameter of the second valve core 42, and the outer diameter of the pilot spring 43 is less than or equal to the outer diameter of the second valve core 42, i.e. Figures 2 to 3 As shown, the inner diameter of the pilot spring 43 is larger than the inner diameter of the core cylinder 421, and its outer diameter is equal to or smaller than the outer diameter of the core cylinder 421. This allows the pilot spring 43 to act completely on the top of the core cylinder 421, ensuring that the cylindrical spring can function effectively and will not tilt under axial force, thus ensuring the stability of the pilot spring 43.

[0036] In an optional embodiment of this application, such as Figures 2 to 3 As shown, the first-missile flexural element 43 is a spring sheet. The first-missile flexural element 43 includes an inner ring 431 and an outer ring 432 coaxially arranged. The outer ring 432 is sleeved outside the inner ring 431. The inner diameter of the outer ring 432 is larger than the outer diameter of the inner ring 431. At least two connecting arms 433 are provided between the inner ring 431 and the outer ring 432. The connecting arms 433 are distributed at intervals along the outer circumference of the inner ring 431 to connect the inner ring 431 and the outer ring 432. In this embodiment, the inner ring 431 is sleeved outside the first valve core column 412. The inner diameter of the inner ring 431 is larger than the outer diameter of the first valve core column 412. The outer diameter of the outer ring 432 is less than or equal to the inner diameter of the guide cylinder 416. Figures 2 to 3 As shown, when the elastic component 43 applies an elastic force, the inner ring 431 and the outer ring 432 are not on the same plane. The inner ring 431 acts on the core cylinder 421 of the second valve core 42, and the outer ring 432 acts on the first valve core base 411. The connecting arm 433 is distributed axially. The elastic component 43 applies axial force to the first valve core 41 and the second valve core 42 respectively. The elastic component 43 applies an upward force to the first valve core 41 and a downward force to the second valve core 42, thereby causing the second valve core 42 to press down and approach the main valve assembly 3.

[0037] It should be noted that the missile component 43 is in an axially extended state under natural conditions.

[0038] Among them, such as Figure 2 , Figure 4 As shown, a limiting protrusion ring 419 is provided on the side of the first valve core base 411 facing the second valve core 42. The limiting protrusion ring 419 protrudes towards the side closer to the second valve core 42. The outer diameter of the limiting protrusion ring 419 is smaller than the outer diameter of the outer ring 432, and the inner diameter of the limiting protrusion ring 419 is larger than the inner diameter of the outer ring 432. This allows the limiting protrusion ring 419 to act completely on the outer ring 432, preventing the outer ring 432 from being completely fitted with the first valve core base 411 and affecting the elastic force.

[0039] It should be noted that, as Figure 2 , Figure 3As shown, the distance between the outer wall of the oil outlet 413 and the central axis of the first valve core 41 is less than the outer diameter of the limiting protrusion 419, thereby avoiding the limiting protrusion 419 and the pilot-operated rigid component 43 from affecting the oil outlet 413.

[0040] In another optional embodiment of this application, such as Figure 5 As shown, the pilot-launched flexible component 43 has high rigidity. In its natural state, the inner ring 431, outer ring 432, and connecting arm 433 of the pilot-launched flexible component 43 are basically on the same plane. The inner ring 431 acts on the core cylinder 421 of the second valve core 42, the outer ring 432 acts on the first valve core base 411, and the connecting arm 433 is used to connect the inner ring 431 and the outer ring 432. Wherein, as... Figure 2 , Figure 5 As shown, the outer ring 432 acts on the limiting protrusion 419, thereby creating a gap between the inner ring 431 and the first valve core base 411. This gap is equal to the axial thickness of the limiting protrusion 419, and the gap provides axial movement space for the inner ring 431. The axial length of this gap is also the adjustment distance between the first valve core 41 and the second valve core 42, so that the inner ring 431 can still apply an axial force to the second valve core 42, enabling the second valve core 42 to move axially relative to the first valve core 41, thereby achieving the regulation of oil flow.

[0041] Based on any of the above embodiments, the main valve assembly 3 will be described in detail; such as Figures 2 to 4 As shown, the main valve assembly 3 includes a main valve seat 32, a main valve core 31, and a bottom valve seat 36 arranged sequentially along the axial direction. The main valve chamber is used to install the main valve core 31, the main valve seat 32, and the bottom valve seat 36; wherein, as... Figures 1 to 3 As shown, the main valve seat 32 is axially fixed to the valve sleeve 2, that is, the main valve seat 32 and the valve sleeve 2 are relatively fixed in the axial direction. The main valve seat 32 is provided with an axially penetrating oil passage hole. There are at least two oil passage holes, which are spaced apart. The oil passage holes are used to cooperate with the second valve core 42 to realize the communication between the pilot valve chamber and the main valve chamber. A first elastic element 34 is provided between the pilot valve assembly 4 and the main valve seat 32. The first elastic element 34 is used to provide axial force to the second valve core 42 to drive the second valve core 42 away from the main valve seat 32.

[0042] In this application, the stiffness of the pilot elastic member 43 is greater than that of the first elastic member 34. When the drive mechanism 5 applies a downward force to the pilot valve assembly 4, the force is sequentially transmitted to the first valve core 41, the pilot elastic member 43, the second valve core 42, and the first elastic member 34. Since the stiffness of the pilot elastic member 43 is greater than that of the first elastic member 34, in the initial stage of operation, the force is transmitted to the core cylinder 421 of the second valve core 42, and the deformation of the first elastic member 34 is greater than that of the pilot elastic member 43. The pilot valve assembly 43 applies axial forces to the first valve core 41 and the second valve core 42 respectively. The pilot valve assembly 43 applies an upward force to the first valve core 41 and a downward force to the second valve core 42, thereby causing the second valve core 42 to press down and approach the main valve assembly. The first elastic element 34 can change the flow area of ​​the oil inlet 321. Therefore, the first elastic element 34 will move first after the pilot valve assembly 4 is subjected to force, thereby immediately changing the oil flow rate and realizing the damping adjustment of the solenoid valve, so that the solenoid valve has a better response speed.

[0043] like Figures 1 to 3 As shown, a main valve spring 33 is provided inside the main valve core 31. The main valve spring 33 is a columnar spring. In an optional embodiment of this application, a second elastic element 35 is provided between the main valve seat 32 and the main valve spring 33. The second elastic element 35 is a spring sheet. The second elastic element 35 and the main valve spring 33 are connected in series to form a variable stiffness elastic component. The second elastic element 35 provides axial force to the main valve spring 33 and also provides a smooth contact surface to the main valve spring 33, ensuring the operational stability of the main valve spring 33. In this application, the second elastic element 35 can effectively balance the tolerances of the internal components of the solenoid valve, thereby achieving the best performance of the main valve spring 33 and other components.

[0044] Among them, such as Figures 1 to 3 As shown, both the first elastic element 34 and the second elastic element 35 are spring sheet structures; the valve sleeve 2 is provided with a first limiting step and a second limiting step. The first limiting step abuts against the upper end of the first elastic element 34 to axially limit the first elastic element 34 and the main valve seat 32, ensuring the installation stability of the first elastic element 34 and the main valve seat 32 in the valve sleeve 2; the second limiting step abuts against the second elastic element 35 to axially limit the second elastic element 35, ensuring the installation stability of the second elastic element 35 in the valve sleeve 2.

[0045] In this embodiment, as Figure 1As shown, under the action of the main valve spring 33 and the second elastic element 35, the main valve seat 32 can be stably installed at a specific position of the valve sleeve 2; the oil in the main valve chamber flows upward. When the middle part of the first elastic element 34 and the second valve core 42 are separated from the main valve seat 32, the oil can pass through the oil passage hole on the main valve seat 32 and enter the pilot valve chamber; when the second valve core 42 applies a downward force to the first elastic element 34, causing the middle part of the first elastic element 34 to fit against the main valve seat 32, even if the oil passes through the oil passage hole, it cannot enter the pilot chamber.

[0046] Of course, in another optional embodiment of this application, the second elastic element 35 may not be provided; when the other components in the solenoid valve can achieve high or absolute precision, the second elastic element 35 may not be required, and the functions of the above embodiments can still be achieved.

[0047] Furthermore, the main valve seat 32 is described in detail; such as Figures 2 to 4 As shown, the main valve seat 32 has a disc structure. A limiting oil ring 322 and a mounting protrusion 323 are provided on the side of the main valve seat 32 facing the second valve core 42. Both the limiting oil ring 322 and the mounting protrusion 323 protrude axially towards the second valve core 42. The limiting oil ring 322 is wrapped around the oil inlet hole 321, and the mounting protrusion 323 is sleeved around the limiting oil ring 322. The inner diameter of the mounting protrusion 323 is larger than the outer diameter of the limiting oil ring 322. In this embodiment, the first elastic element 34 and... The spring-loaded elastic element 43 has a similar structure. The first elastic element 34 includes an inner ring and an outer ring. The mounting convex ring 323 interacts with the outer ring of the first elastic element 34, and the limiting oil ring 322 interacts with the inner ring of the first elastic element 34. The inner ring can be displaced axially relative to the outer ring. The inner diameter of the inner ring is less than or equal to the diameter of the oil inlet hole 321, and the outer diameter of the inner ring is greater than or equal to the outer diameter of the second valve core 42, so that the second valve core 42 can act entirely on the inner ring of the first elastic element 34.

[0048] Among them, such as Figures 1 to 3 As shown, the inner diameter of the limiting oil ring 322 is greater than or equal to the diameter of the maximum opening of the second flow hole 424 facing the limiting oil ring 322. This allows the oil flowing out of the limiting oil ring 322 to pass through the second flow hole 424 and act on the bottom of the second valve core 42, thereby applying an effective force to the second valve core 42 to ensure the stability and effectiveness of the displacement of the second valve core 42 and the effectiveness and stability of the solenoid valve damping control. In addition, as... Figure 2 As shown, when the first elastic element 34 is located between the limiting oil ring 322 and the second valve core 2, the upper and lower end faces of the first elastic element 34 can fit well with the downward protruding annular boss surface at the bottom of the core cylinder 421 and the top of the limiting oil ring 322, thereby reducing the probability of oil leakage.

[0049] like Figure 2 , Figure 4 As shown, in the axial direction, the distance between the limiting oil ring 322 and the second valve core 42 is greater than the distance between the mounting convex ring 323 and the second valve core 42, and the height difference between the two is greater than the thickness of the first elastic member 34. Consequently, the top of the limiting oil ring 322 is lower than the top of the mounting convex ring 323. This allows the oil to pass between the first elastic member 34 and the limiting oil ring 322 and enter the pilot cavity when the first elastic member 34 is on the same plane. At the same time, the second valve core 42 can also drive the inner ring of the first elastic member 34 to move downward, so that the inner ring of the first elastic member 34 abuts against the limiting oil ring 322, preventing the oil in the main valve cavity from entering the pilot cavity through the gap between the first elastic member 34 and the limiting oil ring 322.

[0050] In this embodiment, the first elastic element 34 can apply an axial force to the second valve core 42. Therefore, under the action of the first elastic element 34, the second valve core 42 can quickly move away from the oil inlet 321, thereby quickly connecting the oil passage between the pilot valve assembly 4 and the main valve seat 32, thus improving the response speed of the solenoid valve. On the other hand, with the cooperation of the pilot elastic element 43 and the first elastic element 34, the second valve core 42 has a buffering effect when subjected to oil impact force, and can move stably and smoothly, so that the solenoid valve can stably regulate the damping force and improve the comfort of vehicle use.

[0051] Based on any of the above embodiments, the drive mechanism 5 will be described in detail; such as Figure 2 , Figure 3 As shown, the drive mechanism 5 includes a magnetic tube 51, a slider 55, a mounting base 52, a push rod 53, and a drive elastic element 54. The magnetic tube 51 is located inside the housing 1 and has a cylindrical structure. The magnetic tube 51 has a mounting cavity inside. The slider 55 and the mounting base 52 are located inside the mounting cavity. The slider 55 and the mounting base 52 are distributed axially. Both the slider 55 and the mounting base 52 have axial through holes. The push rod 53 is at least partially located inside the slider 55 and at least partially passes through the mounting base 52 to act on the pilot valve assembly 4. The drive elastic element 54 is sleeved outside the push rod 53 to apply axial force to the mounting base 52 and the slider 55.

[0052] The outer diameter of the push rod 53 is equal to the outer diameter of the first valve core column 412, which ensures that the first valve core column 412 is subjected to uniform force and ensures the displacement stability of the first valve core 41.

[0053] Among them, the driving elastic element 54 is a cylindrical spring; the driving mechanism 5 of this application is an electromagnetic driving structure, the magnetic tube 51 is fitted with a coil, and the slider 55 can slide up and down along the push rod 53.

[0054] Among them, such as Figures 2 to 4As shown, the first valve core 41 is provided with a first flow passage 418, which passes through the first valve core 41 axially; the second valve core 42 is provided with a second flow passage 424, which passes through the second valve core 42 axially; the push rod 53 is provided with a third flow passage 531, which passes through the push rod 53 axially. The first flow passage 418, the second flow passage 424 and the third flow passage 531 are coaxially arranged and connected, and the inner diameters of the first flow passage 418, the second flow passage 424 and the third flow passage 531 are the same, so that the oil in the main valve chamber can enter the drive mechanism 5 in sequence from the second flow passage 424, the first flow passage 418 and the third flow passage 531 to lubricate the drive mechanism 5.

[0055] It should be noted that the various embodiments of this application can be arbitrarily combined into new embodiments, provided that the solutions do not conflict and the technical solutions can coexist.

[0056] The present application has been described in detail above. Specific examples have been used to illustrate the principles and implementation methods of the present application. The descriptions of the embodiments above are only for the purpose of helping to understand the present application and its core ideas. It should be noted that those skilled in the art can make several improvements and modifications to the present application without departing from the principles of the present application, and these improvements and modifications also fall within the protection scope of the claims of the present application.

Claims

1. A solenoid valve, characterized in that, include: Shell (1); Valve sleeve (2) is axially connected to housing (1); The main valve assembly (3) is located on the side of the valve sleeve (2) away from the housing (1) and has an axially penetrating oil inlet (321). A pilot valve assembly (4) is located on the side of the valve sleeve (2) near the housing (1); it includes a first valve core (41), a pilot flexural element (43), and a second valve core (42) arranged sequentially along the axial direction. The pilot flexural element (43) is used to apply axial force to the first valve core (41) and the second valve core (42). The first valve core (41) is provided with an oil outlet hole (413). The second valve core (42) is sleeved on the first valve core (41) and located at the oil outlet end of the oil inlet hole (321). The drive mechanism (5), located inside the housing (1), is used to apply axial force to the pilot valve assembly (4) to adjust the flow area of ​​the second valve core (42) to the oil inlet (321).

2. The solenoid valve according to claim 1, characterized in that, The first valve core (41) includes: The first valve core base (411) has an oil outlet (413) that passes through the first valve core base (411). The first valve core column (412) is coaxially disposed on the side of the first valve core base (411) near the second valve core (42), and its outer diameter is smaller than that of the first valve core base (411) and larger than that of the oil inlet hole (321). The valve sleeve (2) and the housing (1) are provided with an oil outlet gap, which is connected to the oil outlet hole (413).

3. The solenoid valve according to claim 2, characterized in that, The first valve core (41) further includes: An annular protrusion (414) is provided on the side of the first valve core base (411) away from the first valve core column (412), and protrudes axially in a direction away from the first valve core column (412); The slot (415) is provided on the annular protrusion (414) and penetrates the annular protrusion (414) radially. A guide cylinder (416) is located on the side of the first valve core base (411) facing the first valve core column (412); The support ring (417) is located on the side of the first valve core base (411) away from the first valve core column (412) and protrudes axially in a direction away from the first valve core column (412). Wherein, the outer diameter of the support ring (417) is smaller than the inner diameter of the annular protrusion (414), the inner diameter of the guide cylinder (416) is larger than the outer diameter of the first valve core column (412), the outer diameter of the first valve core base (411) is larger than the outer diameter of the first valve core column (412), and the outer walls of the annular protrusion (414), the first valve core base (411), and the guide cylinder (416) are on the same axial plane.

4. The solenoid valve according to claim 2, characterized in that, The pilot spring (43) is a cylindrical spring. The inner diameter of the pilot spring (43) is greater than the inner diameter of the second valve core (42), and the outer diameter of the pilot spring (43) is less than or equal to the outer diameter of the second valve core (42). or, The first-strike component (43) is a spring clip, and the first-strike component (43) includes: The inner ring (431) is sleeved on the outside of the first valve core column (412), and its inner diameter is larger than the outer diameter of the first valve core column (412); The outer ring (432) is sleeved outside the inner ring (431) and is coaxially arranged with the inner ring (431). Its outer diameter is smaller than the inner diameter of the first valve core base (411). Connecting arms (433), at least two, are spaced apart along the outer periphery of the inner ring (431) to connect the inner ring (431) and the outer ring (432).

5. The solenoid valve according to claim 4, characterized in that, The first valve core base (411) is provided with a limiting protrusion (419) on the side facing the first valve core (43), and the limiting protrusion (419) protrudes towards the side close to the second valve core (42); Among them, the outer diameter of the limiting protrusion (419) is smaller than the outer diameter of the outer ring (432), and the inner diameter of the limiting protrusion (419) is larger than the inner diameter of the outer ring (432).

6. The solenoid valve according to claim 1, characterized in that, The second valve core (42) includes: Core tube (421), cylindrical structure, adapted to the first valve core column (412); The second valve core base (422) is coaxially arranged with the core cylinder (421) and located on the side of the core cylinder (421) away from the first valve core column (412); The buffer ring groove (423) is located at the connection between the core cylinder (421) and the second valve core base (422), and is recessed radially away from the first valve core column (412).

7. The solenoid valve according to any one of claims 1 to 6, characterized in that, The main valve assembly (3) includes: The main valve core (31) is located in the main valve chamber; The main valve seat (32) is located between the main valve core (31) and the second valve core (42) and is axially fixedly connected to the valve sleeve (2); The main valve spring (33) is located between the main valve seat (32) and the main valve core (31) and is used to apply axial force to the main valve seat (32) and the main valve core (31); The first elastic element (34) is disposed between the main valve seat (32) and the second valve core (42) for applying axial force to the second valve core (42); the stiffness of the first elastic element (43) is greater than that of the first elastic element (34); The oil inlet (321) is located on the main valve seat (32).

8. The solenoid valve according to claim 7, characterized in that, Also includes: The second elastic element (35) is located between the main valve seat (32) and the main valve spring (33); And / or, The limiting oil ring (322) is located on the side of the main valve seat (32) facing the second valve core (42), and is wrapped around the oil inlet hole (321), protruding towards the side closer to the second valve core (42); The mounting ring (323) is located on the side of the main valve seat (32) facing the second valve core (42), and is sleeved on the outside of the limiting oil ring (322), protruding towards the side closer to the second valve core (42); Among them, the inner diameter of the mounting convex ring (323) is larger than the outer diameter of the limiting oil ring (322), and the outer diameter of the limiting oil ring (322) is smaller than the outer diameter of the second valve core (42); Along the axial direction, the distance between the limiting oil ring (322) and the second valve core (42) is greater than the distance between the mounting convex ring (323) and the second valve core (42).

9. The solenoid valve according to claim 1, characterized in that, The drive mechanism (5) includes: A magnetic tube (51) is disposed inside the housing (1); The slider (55) is located inside the magnetic tube (51); Mounting base (52) is located on the side of slider (55) near pilot valve assembly (4); The push rod (53), at least partially located within the slider (55), and at least partially passing through the mounting base (52), acts on the pilot valve assembly (4); The driving elastic element (54) is sleeved outside the push rod (53) and is used to apply axial force to the mounting base (52) and the slider (55); The outer diameter of the push rod (53) is equal to the outer diameter of the first valve core column (412).

10. The solenoid valve according to claim 9, characterized in that, Also includes: The first flow passage (418) passes through the first valve core (41) axially. The second flow passage (424) passes through the second valve core (42) axially. The third flow passage (531) is provided on the push rod (53) and is coaxially arranged and connected with the first flow passage (418) and the second flow passage (424); The first flow passage (418), the second flow passage (424), and the third flow passage (531) have the same inner diameter. The diameter of the largest opening of the second flow passage (424) facing the limiting oil ring (322) is less than or equal to the inner diameter of the limiting oil ring (322).

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