Offset electromagnetic valve assembly for shock absorber

Abstract

The utility model relates to a bias solenoid valve assembly for a shock absorber, which comprises an upper magnetism isolating sleeve, a lower magnetism isolating sleeve, a front-stage valve and a main-stage valve, a movable iron seat is arranged in the upper magnetism isolating sleeve in a close fit manner, and the lower magnetism isolating sleeve is provided with a first circulation channel penetrating through the lower magnetism isolating sleeve; the valve ring seat is provided with a second circulation channel communicated with the first circulation channel, a preceding-stage channel communicated with the preceding-stage cavity and the first circulation channel is arranged between the upper magnetism isolating sleeve and the lower magnetism isolating sleeve, an offset valve element is arranged between the movable iron seat and the lower magnetism isolating sleeve, and an offset spring is arranged between the offset valve element and the movable iron seat. When power is cut off, closing pressure acts on the lower magnetism isolating sleeve through the bias spring, the outer wall of the bias valve element slides relative to the inner wall of the upper magnetism isolating sleeve and can axially move in the preceding-stage cavity to control the preceding-stage cavity and the preceding-stage channel to be disconnected or connected, and when power is cut off, the preceding-stage cavity and the preceding-stage channel are disconnected through the bias valve element. And the bias electromagnetic valve assembly has damping force when being powered off.

Description

Technical Field

[0001] The utility model relates to the field of shock absorbers, in particular to a biased electromagnetic valve assembly for shock absorbers. Background Art

[0002] Traditional shock absorbers have fixed characteristics and provide fixed damping characteristic curves during extension or compression, while adjustable shock absorbers provide a characteristic field. The system selects different damping in the field in a timely manner according to the working conditions (road conditions, braking, acceleration, turning, driver's wishes, etc.) to curb body vibration, prevent tires from bouncing, and maintain body stability. Variable damping shock absorbers are mainly realized through magnetorheological, solenoid valve, stepper motor and other methods. Solenoid valve type is widely used for its reliable performance, low cost, quick response, compact structure and other advantages.

[0003] Solenoid valve type variable damping shock absorbers are being used more and more widely at home and abroad. They are mainly controlled by actuators to control the front-stage valve, thereby setting the pressure in the control chamber. The control pressure applies a closing force to the main-stage valve. The front-stage valve can be used to control very large adjustment forces or closing forces with low energy input. By using the front-stage valve and the main-stage valve and, if necessary, a series connection with a traditional solenoid valve as part of the solenoid valve device, the characteristic curve characteristics can be greatly influenced.

[0004] The existing Chinese invention patent with publication number CN118912138A discloses an electromagnetic damping valve device for a shock absorber. By setting the magnetic isolation sleeve separately and simplifying the original press-fitting process into multiple loose-fitting part modules, it can be easily assembled and is convenient for the subsequent automated assembly line. By changing the moving iron originally guided by the internal sleeve to an integrated moving iron core, the upper magnetic isolation sleeve is used for external guidance, and the double spring structure that needs to be set in series at both ends of the moving iron core is changed to a single spring to adjust the preload force, thereby reducing the fluctuation range and improving stability. The original sleeve is replaced by a Teflon film to reduce the friction caused by the tilt of the moving iron core when it is working. Through the above modularized parts, the entire process is installed through the threaded connection of the lower magnetic isolation sleeve, which reduces the processing accuracy requirements, avoids tolerance superposition, and avoids the process that originally required a press to perform tight fitting, thereby achieving convenient assembly, reducing costs, and improving assembly efficiency.

[0005] However, the above technical solution still has the following disadvantages in actual use:

[0006] 1. In this technical solution, the first flow channel 74 connected to the front stage cavity 701 needs to be opened in the lower magnetic isolation sleeve 7. However, due to the limitation of the first limit portion 72, the processing of the entire first flow channel 74 that requires multi-section conduction is very difficult. At the same time, burrs will remain between the multi-section connecting holes of the first flow channel 74, affecting the adjustment accuracy of the damping.

[0007] 2. In this technical solution, the intersection of the first circulation channel 74 and the second circulation channel 84 at the lower magnetic isolation sleeve 7 has a right-angle design and the oil storage space is too small, which causes impact when the first circulation channel 74 enters the second circulation channel 84, causing oil turbulence. The turbulence will cause the oil flow to be unstable, causing the oil flow and pressure through the damping valve to fluctuate, which directly affects the damping force adjustment accuracy of the shock absorber, resulting in the inability to accurately control the damping force, thereby affecting the vehicle's shock absorption performance and ride comfort.

[0008] 3. The solenoid valve assembly in this technical solution is a proportional valve assembly, and the damping force increases with the increase of current. However, this technical solution does not have the biased valve characteristic that the damping force first decreases and then increases as the current increases, and cannot meet the market demand for the solenoid valve assembly with this characteristic. Utility Model Content

[0009] The technical problem to be solved by the utility model is to provide a biasing solenoid valve assembly for a shock absorber in view of the deficiencies of the above-mentioned prior art.

[0010] To achieve the above-mentioned purpose, the utility model provides the following technical solutions: a biased solenoid valve assembly for a shock absorber, comprising an upper magnetic isolation sleeve, a lower magnetic isolation sleeve, a front-stage valve and a main-stage valve, the upper magnetic isolation sleeve being detachably connected to the lower magnetic isolation sleeve, the upper magnetic isolation sleeve being provided with a moving iron assembly connected to the front-stage valve and a moving iron seat arranged at the front end of the moving iron assembly, the main-stage valve being movably installed in the lower magnetic isolation sleeve, and being arranged against the front-stage valve after passing through the lower magnetic isolation sleeve, a valve ring seat being provided at the bottom of the lower magnetic isolation sleeve, one end of the lower magnetic isolation sleeve cooperating with the upper magnetic isolation sleeve to form a front-stage cavity for the front-stage valve to move therein, and the other end cooperating with the valve ring seat to form a main-stage cavity for the main-stage valve to move therein, The characteristics are as follows: the moving iron seat is tightly installed in the upper magnetic isolation sleeve, the lower magnetic isolation sleeve is provided with a first circulation channel penetrating the lower magnetic isolation sleeve, the valve ring seat is provided with a second circulation channel connected to the first circulation channel, a front-stage channel connecting the front-stage cavity with the first circulation channel is provided between the upper magnetic isolation sleeve and the lower magnetic isolation sleeve, a bias valve core is provided between the moving iron seat and the lower magnetic isolation sleeve, a bias spring is provided between the bias valve core and the moving iron seat, and the closing pressure is applied to the lower magnetic isolation sleeve through the bias spring, the outer wall of the bias valve core slides relative to the inner wall of the upper magnetic isolation sleeve, and can move axially in the front-stage cavity to control the disconnection or connection between the front-stage cavity and the front-stage channel.

[0011] By adopting the above technical scheme, a bias valve core and a bias spring are added on the basis of the direct proportional solenoid valve. At the same time, the bias valve core is located between the moving iron seat and the lower magnetic isolation sleeve, and the closing pressure is applied to the main valve through the bias spring. The outer wall of the bias valve core slides relatively with the inner wall of the upper magnetic isolation sleeve, and can move axially in the front-stage cavity to control the disconnection or conduction between the front-stage cavity and the front-stage channel, thereby realizing the bias valve characteristic that the damping force first decreases and then increases when the current increases, meeting the market demand for solenoid valves with such characteristics, so that the solenoid valve has a certain damping force in the power-off state. Specifically, if the power supply equipment of the solenoid valve fails and is damaged, the bias valve core will disconnect the conduction between the front-stage cavity and the front-stage channel through the bias spring, ensuring that the solenoid valve also has damping force in the power-off state to improve safety.

[0012] The above-mentioned biased solenoid valve assembly for a shock absorber may be further configured as follows: a plurality of annular grooves are provided on the outer peripheral surface of the biased valve core.

[0013] By adopting the above technical solution, since the offset valve core needs to slide axially in the upper magnetic isolation sleeve, there must be a gap between the offset valve core and the upper magnetic isolation sleeve for the oil to pass through. By opening a plurality of annular grooves on the outer circumferential surface of the offset valve core, the oil is retained in the annular grooves, thereby achieving oil sealing and preventing the oil from passing through the outer circumferential surface of the offset valve core.

[0014] The above-mentioned biased solenoid valve assembly for a shock absorber can be further configured as follows: a biased cavity is formed between the biased valve core and the moving iron seat, a biased exhaust hole is provided on the biased valve core to connect the biased cavity with the front-stage channel, and the biased valve core is provided with a front-stage cavity control part extending to one end of the main-stage valve.

[0015] By adopting the above technical solution, a biased exhaust hole is set to make the biased chamber and the front chamber communicate with each other, so that the oil can be concentrated to the biased exhaust hole for circulation, so that the gap between the biased valve core and the upper magnetic isolation sleeve can be reduced, avoiding tilting, affecting the damping force curve, and improving the stability of the lifting process.

[0016] The above-mentioned biased solenoid valve assembly for a shock absorber can be further configured as follows: one end of the moving iron seat is tightly mounted on the upper magnetic isolation sleeve, and cooperates with the upper magnetic isolation sleeve to form a moving iron active cavity for the moving iron assembly in the inner axial direction, and the other end is provided with a moving iron step, and a clearance groove is provided between the moving iron step and the inner wall of the upper magnetic isolation sleeve, and the biased valve core is provided with a biased ring platform that can be inserted into the clearance groove corresponding to the clearance groove, and the inner side of the biased ring platform is provided with a biased limit surface that can be attached to the moving iron seat, and the intersection of the biased limit surface and the biased ring platform has a biased step that is compatible with the moving iron step.

[0017] By adopting the above technical scheme, since the overall structure of the solenoid valve assembly is relatively small, in order to ensure that the already narrow offset valve core can be stably raised and lowered, it is necessary to give the contact surface between the offset valve core and the upper magnetic isolation sleeve a sufficient length, wherein the upper end of the solenoid valve will form a magnetic field with electromagnetic force through the electromagnetic coil, and the moving iron seat will also become a magnet to generate magnetic force. At this time, the offset valve core will also move upward due to the magnetic force, wherein the setting of the moving iron step limits the moving iron seat, and by hollowing out both sides of the moving iron step, the offset valve core is gradually inserted into the gap after the current increases, giving the offset valve core a longer sliding surface to improve stability, and by setting the offset limit surface to make it magnetically fit with the bottom of the moving iron seat, corresponding to the offset valve core upward travel limit, at this time the front-stage channel is opened to the maximum extent, the design of the moving iron step and the offset ring table improves the stability of the structure, ensures that the offset valve core will not deviate during movement, and the adaptive design of the offset limit surface and the moving iron step ensures the precise fit between the offset valve core and the moving iron seat, thereby improving the reliability of the overall device.

[0018] The above-mentioned biased solenoid valve assembly for a shock absorber can be further configured as follows: a first spring mounting groove is provided in the moving iron seat, a second spring mounting groove is provided at the position of the biased valve core corresponding to the first spring mounting groove, one end of the biased spring is tightly installed in the first spring mounting groove and the other end is abutted against the second spring mounting groove, the front-stage valve includes a valve head seat connected to the moving iron assembly, a front-stage valve head and a front-stage spring sheet arranged between the valve head seat and the front-stage valve head, one end of the front-stage valve head is abutted against the main-stage valve, and the other end is abutted against the front-stage spring sheet.

[0019] By adopting the above technical solution, the bias spring is tightly installed in the first spring installation groove, which facilitates the assembly of the entire bias solenoid valve. The setting of the first and second spring installation grooves avoids the displacement and distortion of the bias spring during the deformation process. The raised part at one end of the valve head of the front-stage valve enters into the main-stage valve, thereby improving the sealing between the valve head and the valve core and making the throttling more stable. At the same time, the other end promotes the movement of the valve head of the front-stage valve toward one end of the main-stage valve through the spring sheet, which helps to reset and realize flexible shock absorption while giving the main-stage valve a certain preload force.

[0020] The above-mentioned biased solenoid valve assembly for a shock absorber can be further configured as follows: the first circulation channel straightly penetrates the lower magnetic isolation sleeve, the upper magnetic isolation sleeve is provided with a step ring seat corresponding to the first circulation channel, the inner wall of the step ring seat is formed into an arc angle, and an annular protrusion extends from one end of the lower magnetic isolation sleeve in the direction of the front-stage valve, the end of the annular protrusion is higher than the first circulation channel, and the part connected to the first circulation channel has an arc-shaped guide portion, and the front-stage channel is formed between the arc-shaped guide portion and the step ring seat.

[0021] The above technical scheme, compared with the prior art, changes the structure of the lower magnetic isolation sleeve so that the moving iron seat is directly installed on the upper magnetic isolation sleeve, so that the lower magnetic isolation sleeve does not need to be against the moving iron seat, and the first limiting part is deleted, so that the original complex and tortuous processing method of the first circulation channel can be changed to a straight through hole, which simplifies the processing technology and reduces the processing difficulty. At the same time, it avoids the problem of unstable damping circulation caused by burrs caused by complex flow channel design, optimizes the flow path of the oil, reduces the resistance and impact of the oil during the flow process, improves the throttling effect and the stability of the damping force, and allows the damping fluid in the front stage cavity to stably enter the first circulation channel through the front stage channel. The step ring seat provides a clear structural boundary for the first circulation channel, ensuring that the oil can smoothly transition when passing through the first circulation channel. The arc angle of the inner wall can effectively reduce the impact and turbulence of the oil during the flow process, avoiding The impact and turbulence caused by the original right-angle design lead to unstable oil flow, increased energy loss and noise problems. The annular protrusion is located at the front end of the lower magnetic isolation sleeve, and its end is higher than the first circulation channel, which provides additional structural support for the movement of the front-stage valve and the main-stage valve, ensuring the coaxiality and stability between the components. The front-stage channel formed between the annular protrusion and the step ring seat of the upper magnetic isolation sleeve is used to connect the front-stage cavity and the first circulation channel, and then guide the oil in the front-stage cavity to the first circulation channel, thereby realizing effective distribution of the oil between the front-stage valve and the main-stage valve. The arc-shaped guide part is located at the connection between the annular protrusion and the first circulation channel. The design of the arc-shaped guide part significantly reduces the impact of the oil when entering the front-stage channel, avoiding the turbulence caused by the right-angle design. This optimized flow path makes the oil flow more stable, reduces pressure fluctuations, improves the accuracy of damping force adjustment, and reduces energy loss.

[0022] The above-mentioned biased solenoid valve assembly for a shock absorber can be further configured as follows: a converging transition cavity is provided between the first circulation channel and the second circulation channel, a first diameter expansion portion is provided at one end of the first circulation channel corresponding to the converging transition cavity, and the inner wall of the first diameter expansion portion is connected to the first circulation channel at a circular arc angle, and a second diameter expansion portion is provided at one end of the second circulation channel corresponding to the converging transition cavity, and the inner wall of the second diameter expansion portion is connected to the second circulation channel at a circular arc angle.

[0023] By adopting the above technical scheme, the converging transition chamber is located between the first circulation channel and the second circulation channel, providing a buffer area for the oil. This area allows the oil to smoothly transition and distribute before entering the next channel, reducing the impact and pressure fluctuations in the flow. By increasing the cross-sectional area of ​​the converging transition chamber at the intersection of the first circulation channel and the second circulation channel, the oil can be more evenly distributed between the main-stage valve and the front-stage valve, thereby improving the damping effect of the entire system and avoiding hysteresis. The inner walls of the first and second expanded diameter portions adopt an arc angle design, which effectively reduces the impact of the oil when entering or leaving the converging transition chamber, avoiding turbulence and pressure fluctuations caused by the right-angle design, so that the oil can smoothly transition from one channel to another, optimizing the flow path, and improving the smoothness of the damping liquid. The noise and hysteresis during the operation of the device can be significantly reduced, and the ride comfort can be improved.

[0024] The above-mentioned biased solenoid valve assembly for a shock absorber can be further configured as follows: one end of the lower magnetic isolation sleeve is provided with a first threaded portion threadedly connected to the upper magnetic isolation sleeve, and the other end is provided with a second threaded portion threadedly connected to the valve ring seat, the second threaded portion has an adjustment step at one end facing the main-stage valve, one end of the valve ring seat is arranged to abut against the main-stage valve, and a valve ring damping adjustment component is provided on the valve ring seat, the valve ring damping adjustment component includes a valve stem inserted into the valve ring seat, a damping valve plate group sleeved on the outer circumferential surface of the valve stem, and a first damping channel opened on the valve ring seat and connected to the main-stage cavity, one end of the valve stem passes through the valve ring seat and is sleeved with the damping valve plate group, and then the damping valve plate group is pressed against the surface of the first damping channel, one end of the lower magnetic isolation sleeve corresponding to the front-stage valve is provided with a guide hole for the central axis of the main-stage valve to pass through, the central axis is provided with an axial channel corresponding to the front-stage valve and transverse channels respectively connected to the axial channel and the main-stage cavity, and the main-stage valve is provided with a main cavity through groove connected to the transverse channel.

[0025] By adopting the above technical scheme, a stable and flexible connection is achieved between the upper and lower magnetic isolation sleeves and the valve ring seat through threaded connection, which enables quick disassembly and assembly with the upper and lower magnetic isolation sleeves and the valve ring seat, avoids the cumulative tolerance superposition here, improves the convenience of maintenance and replacement, and reduces maintenance costs. An adjustment step with an adjustable gap is provided between the second threaded portion and the main-stage valve, and the second threaded portion serves as a normal installation structure of the valve ring seat. When additional spring preload force adjustment is required, the position of the main-stage valve can be adjusted by rotating the valve ring seat and adjusting the relative distance between the valve ring seat and the front-stage valve, thereby conveniently changing the space of the main-stage chamber. By setting the valve stem and the damping valve plate group, the damping valve plate The group pressure is covered on the surface of the first damping channel to control the damping force of the first damping channel, thereby adjusting the flow rate and pressure of the damping medium. The linkage control of the second circulation channel and the first circulation channel further optimizes the distribution of the damping medium and improves the response speed and adjustment accuracy of the shock absorber. By controlling the disconnection or conduction of the second circulation channel and the first circulation channel, the flow of the damping medium is precisely controlled, thereby optimizing the performance of the shock absorber. A controllable damping force is applied to the main-stage valve through the valve ring damping adjustment component, so that the damping oil can enter the front-stage valve through the main-stage cavity, the main cavity groove, the transverse channel and the axial channel, and reflux through the first circulation channel and the second circulation channel to achieve the overall circulation of the damping.

[0026] The above-mentioned biased solenoid valve assembly for a shock absorber can be further configured as follows: a plurality of height adjustment gaskets or height adjustment springs are provided between the first circulation channel and the second circulation channel, one end of the height adjustment gasket or height adjustment spring is abutted against the lower magnetic isolation sleeve, and the other end is abutted against the valve ring seat, and there is a through hole in the middle for connecting the first circulation channel and the second circulation channel.

[0027] By adopting the above technical solution, one or more superimposed height adjustment gaskets or height adjustment springs are selected to adjust the preload force of the valve ring seat and control the height of the main-stage valve to ensure the consistency of the spring force between the valve ring seat and the main-stage valve, and offset the superposition of the tolerances of the axial parts, which is ultimately reflected in the gap between the valve ring seat and the main-stage valve, so that the preload spring forces at both ends remain balanced, avoiding the problem of being unable to apply torque after the valve ring seat is locked.

[0028] The above-mentioned biased solenoid valve assembly for a shock absorber can be further configured as follows: the moving iron assembly includes a moving iron, a moving iron core shaft, a valve spring and a return spring, one end of the moving iron core shaft is interference-fitted inside the moving iron, and the other end extends out of the moving iron seat and the biased valve core and is fixedly connected to the previous valve, the end of the moving iron core shaft away from the previous valve is welded integrally with the moving iron, the moving iron assembly is maintained in a pre-defined initial position by the valve spring and the return spring with opposite effects, the end of the moving iron seat corresponding to the return spring is provided with a limiting ring seat which is pre-tightened against the return spring, a gap is provided between the limiting ring seat and the moving iron core shaft, and a moving iron bushing is provided at the end of the limiting ring seat away from the return spring, the outer wall of the moving iron bushing is tightly fitted with the moving iron seat, and the inner wall slides against the moving iron core shaft.

[0029] With the above technical solution, the moving iron assembly consists of a moving iron and a moving iron core shaft. The moving iron is the core component of the solenoid valve and is responsible for responding to the magnetic field generated by the electromagnetic coil, while the moving iron core shaft is the support and guide component of the moving iron. One end of the moving iron core shaft is installed inside the moving iron through an interference fit. Interference fit is an assembly method that achieves a tight connection through elastic deformation of the material, which can provide a high-strength connection to ensure a tight fit between the moving iron and the moving iron core shaft. The other end passes through the offset valve core and is fixedly connected to the front-stage valve. The end of the moving iron core shaft away from the front-stage valve is fixed to the moving iron through laser welding to fill the end gap between the two, further enhancing the bonding strength between the two. By optimizing the structure of the moving iron assembly, its strength, stability and motion performance are significantly improved. Through the design of interference installation and welding, the connection between the moving iron core shaft and the moving iron It is more solid and reduces the risk of loosening. This design not only improves the accuracy of damping force adjustment and the reliability of the device, but also reduces noise and vibration, avoids the deviation of the moving iron assembly during movement, and improves the accuracy of damping adjustment. The moving iron assembly is maintained in a pre-defined initial position by spring assemblies with opposite effects, thereby achieving stable positioning and good resetting ability of the moving iron assembly. This ensures that the front-stage valve can be maintained in a predetermined position when not powered, ensuring the stability and reliability of the device, while avoiding the tilting of the moving iron core shaft. The setting of the limit ring seat enables the reset spring to set the preload force through the limit ring seat, and the setting of the moving iron bushing on the coaxial line replaces the moving iron core shaft in contact with the moving iron seat, thereby avoiding the moving iron core shaft from tilting during movement, thereby causing jamming, improving transmission efficiency, avoiding wear, and increasing service life.

[0030] The utility model is further described below in conjunction with the accompanying drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] Figure 1 It is a cross-sectional schematic diagram of an embodiment of the utility model.

[0032] Figure 2 for Figure 1 Enlarged view of point A.

[0033] Figure 3 for Figure 1 Enlarged view of point B.

[0034] Figure 4 for Figure 1 Enlarged view of point C.

[0035] Figure 5 It is a cross-sectional schematic diagram of the front-stage valve according to an embodiment of the utility model.

[0036] Figure 6 It is a cross-sectional schematic diagram of the embodiment of the utility model after power is supplied.

[0037] Figure 7 This is a curve diagram of the relationship between current and damping force in an embodiment of the utility model. DETAILED DESCRIPTION

[0038] like Figure 1-Figure 7As shown, a biased solenoid valve assembly for a shock absorber includes an upper magnetic isolation sleeve 1, a lower magnetic isolation sleeve 2, a front-stage valve 3 and a main-stage valve 4. The upper magnetic isolation sleeve 1 is threadedly connected to the lower magnetic isolation sleeve 2 through a first threaded portion 11. A moving iron assembly 5 connected to the front-stage valve 3 and a moving iron seat 6 arranged at the front end of the moving iron assembly 5 are arranged in the upper magnetic isolation sleeve 1. The main-stage valve 4 is movably installed in the lower magnetic isolation sleeve 2, and after passing through the lower magnetic isolation sleeve 2, it is abutted against the front-stage valve. A valve ring seat 7 is arranged at the bottom of the lower magnetic isolation sleeve 2. The lower magnetic isolation sleeve 2 is provided with a valve ring seat 7. One end cooperates with the upper magnetic isolation sleeve 1 to form a front-stage chamber I for the front-stage valve 3 to move therein, and the other end cooperates with the valve ring seat 7 to form a main-stage chamber II for the main-stage valve 4 to move therein. One end of the moving iron seat 6 is tightly mounted on the upper magnetic isolation sleeve 1, and cooperates with the upper magnetic isolation sleeve 1 to form a moving iron activity chamber III for the moving iron assembly 5 in the inner axial direction, and the other end is provided with a moving iron step 61. The lower magnetic isolation sleeve 2 is provided with a first flow channel 21 that straightly passes through the lower magnetic isolation sleeve 2, and the valve ring seat 7 is provided with a second flow channel 7 that is conductive with the first flow channel 21. 1, a front-stage channel 12 for connecting the front-stage chamber I with the first flow channel 21 is provided between the upper magnetic isolation sleeve 1 and the lower magnetic isolation sleeve 2, a bias valve core 8 is provided between the movable iron seat 6 and the lower magnetic isolation sleeve 2, a bias spring 81 is provided between the bias valve core 8 and the movable iron seat 6, and a closing pressure is applied to the lower magnetic isolation sleeve 2 through the bias spring 81, the outer wall of the bias valve core 8 and the inner wall of the upper magnetic isolation sleeve 1 slide relative to each other, and can axially move in the front-stage chamber I to control the disconnection or connection between the front-stage chamber I and the front-stage channel 12, and the bias valve core 8 A bias cavity IV is formed between the bias valve core 8 and the moving iron seat 6, and a bias exhaust hole 83 is provided on the bias valve core 8 to connect the bias cavity IV with the front-stage channel 12. The bias valve core 8 is provided with a front-stage cavity control part 84 extending to one end of the main-stage valve 4 for abutting against the lower magnetic isolation sleeve 2. A plurality of axially arranged annular grooves 82 are provided on the outer peripheral surface of the bias valve core 8, and an oil seal is formed between the annular grooves 82 and the inner wall of the upper magnetic isolation sleeve 1, so that the oil can only flow through the bias exhaust hole 83, thereby increasing the stability of the movement of the bias valve core 8, thereby forming a bias solenoid valve assembly.

[0039] like Figure 1-Figure 6As shown, there is a clearance groove 62 between the moving iron step 61 and the inner wall of the upper magnetic isolation sleeve 1, and a biasing ring platform 85 which can be inserted into the clearance groove 62 is provided at the offset valve core 8 corresponding to the clearance groove 62, and a biasing limit surface 86 which can be magnetically attached to the bottom of the moving iron seat 6 is provided on the inner side of the biasing ring platform 85, and a biasing step 87 which is adapted to the moving iron step 61 is provided at the intersection of the biasing limit surface 86 and the biasing ring platform 85, and a first spring mounting groove 63 is provided in the moving iron seat 6, and a second spring mounting groove 88 is provided at the offset valve core 8 corresponding to the first spring mounting groove 63, one end of the biasing spring 81 is tightly mounted in the first spring mounting groove 63, and the other end is against the second spring mounting groove 88, the moving iron assembly 5 includes a moving iron 51, a moving iron core shaft 52, a valve spring 53 and a reset spring 54, one end of the moving iron core shaft 52 is interference mounted inside the moving iron 51, and the other end extends out of the moving iron seat 6 and the biasing ring platform 85. The valve core 8 is fixedly connected to the front-stage valve 3 at the rear, and the end of the moving iron core shaft 52 away from the front-stage valve 3 is welded integrally with the moving iron 51. The moving iron assembly 5 is maintained in a pre-defined initial position by the valve spring 53 and the return spring 54 acting in opposite directions. The end of the moving iron seat 6 corresponding to the return spring 54 is provided with a limit ring seat 60 which is pre-tightened against the return spring 54. There is a gap 601 between the limit ring seat 60 and the moving iron core shaft 52, and the end of the limit ring seat 60 away from the return spring 54 is provided with a moving iron bushing 64. The outer wall of the moving iron bushing 64 is tightly fitted with the moving iron seat 6, and the inner wall slides against the moving iron core shaft 52. The front-stage valve 3 includes a valve head seat 31 tightly connected to the moving iron core shaft 52, a front-stage valve head 32, and a front-stage spring piece 33 arranged between the valve head seat 31 and the front-stage valve head. One end of the front-stage valve head 32 is against the main valve 4, and the other end is against the front-stage spring piece 33.

[0040] like Figure 1 , Figure 2 , Figure 4As shown, the upper magnetic isolation sleeve 1 is provided with a step ring seat 13 corresponding to the first circulation channel 21, and the inner wall of the step ring seat 13 is at an arc angle. An annular protrusion 20 is extended at one end of the lower magnetic isolation sleeve 2 facing the front-stage valve 3, and the end of the annular protrusion 20 is higher than the first circulation channel 21, and the part connected to the first circulation channel 21 has an arc-shaped guide portion 201, and the front-stage channel 12 is formed between the arc-shaped guide portion 201 and the step ring seat 13. A converging transition cavity V is provided between the first circulation channel 21 and the second circulation channel 71, and a first diameter expansion portion 211 is provided at one end of the first circulation channel 21 corresponding to the converging transition cavity V, and the inner wall of the first diameter expansion portion 211 is connected to the first circulation channel 21 at an arc angle, and a second circulation channel 71 is provided at one end corresponding to the converging transition cavity V. There is a second expansion portion 711, the inner wall of the second expansion portion 711 is connected to the second circulation channel 71 at an arc angle, thereby effectively reducing the impact of the oil when entering or leaving the converging transition chamber V, avoiding turbulence and pressure fluctuations caused by the right-angle design, so that the oil can smoothly transition from one channel to another, optimizing the flow path, and at the same time, there are one or more superimposed height adjustment springs (gaskets) 70 between the first circulation channel 21 and the second circulation channel 71 to eliminate the cumulative tolerance of axial parts and adjust the spring force at both ends to maintain balance. One end of the height adjustment spring (gasket) 70 is against the lower magnetic isolation sleeve 2, and the other end is against the valve ring seat 7, and there is a through hole 701 in the middle for the first circulation channel 21 and the second circulation channel 71 to communicate.

[0041] like Figure 1 , Figure 4 As shown, the lower magnetic isolation sleeve 2 is provided with a second threaded portion 22 threadedly connected to the valve ring seat 7, and the second threaded portion 22 has an adjustment step 221 at one end facing the main stage valve 4. One end of the valve ring seat 7 is arranged against the main stage valve 4, and a valve ring damping adjustment component is provided on the valve ring seat 7. The valve ring damping adjustment component includes a valve stem 72 inserted into the valve ring seat 7, a damping valve plate group 73 sleeved on the outer peripheral surface of the valve stem 72, and a first damping channel 74 opened on the valve ring seat 7 and communicating with the main stage chamber II. The valve stem 72 One end passes through the valve ring seat 7 and is sleeved with a damping valve plate group 73, which is then pressed against the surface of the first damping channel 74. The lower magnetic isolation sleeve 2 is provided with a guide hole 23 at one end corresponding to the front-stage valve 3 for the central axis 40 of the main-stage valve 4 to pass through. The central axis 40 is provided with an axial channel 401 corresponding to the front-stage valve 3 and a transverse channel 402 respectively connected to the axial channel 401 and the main-stage chamber II. The main-stage valve 4 is provided with a main cavity through groove 41 connected to the transverse channel 402.

[0042] like Figure 7As shown, the damping force variation curve of the bias solenoid valve assembly when powered on is disclosed, wherein the X-axis represents the current and the Y-axis represents the damping force. For example, when the current is 0A-0.4A, it represents the curve of the bias solenoid valve assembly from power off to power on. At this time, 0A is the power off state, which can be referred to Figure 1 At this time, the electromagnetic coil is not energized, and the bias valve core 8 is not subjected to magnetic force, so that the bias spring 81 pushes the front stage chamber control part 84 of the bias valve core 8 to abut against the end face of the lower magnetic isolation sleeve 2, isolating the front stage chamber I and the front stage channel 12, so that the bias electromagnetic valve assembly also has damping force in the power-off state. As the current increases, the moving iron seat 6 also generates magnetic force with the magnetic field of the electromagnetic coil, adsorbing the bias valve core 8 and slowly moving up until the bias limit surface 86 of the bias valve core 8 abuts against the moving iron seat 6. At this time, the current is 0.4A, which can be referred to Figure 6 The biased solenoid valve assembly state is shown, and then the current is increased to 1.6A again. Since the biased valve core 8 has been offset in the upper position, the biased valve core does not work at this time. The magnetic force generated by the increased current drives the moving iron assembly 5 to work, achieving the effect of increased damping force as the current increases in the proportional solenoid valve assembly.

Claims

1. A biased solenoid valve assembly for a shock absorber, comprising an upper magnetic isolation sleeve, a lower magnetic isolation sleeve, a front-stage valve and a main-stage valve, wherein the upper magnetic isolation sleeve is detachably connected to the lower magnetic isolation sleeve, wherein a moving iron assembly connected to the front-stage valve and a moving iron seat arranged at the front end of the moving iron assembly are arranged in the upper magnetic isolation sleeve, wherein the main-stage valve is movably installed in the lower magnetic isolation sleeve, and after passing through the lower magnetic isolation sleeve, it is abutted against the front-stage valve, wherein a valve ring seat is arranged at the bottom of the lower magnetic isolation sleeve, wherein one end of the lower magnetic isolation sleeve cooperates with the upper magnetic isolation sleeve to form a front-stage cavity for the front-stage valve to move therein, and the other end cooperates with the valve ring seat to form a main-stage cavity for the main-stage valve to move therein, wherein the main-stage valve is characterized in that: The moving iron seat is tightly installed in the upper magnetic isolation sleeve, the lower magnetic isolation sleeve is provided with a first circulation channel that penetrates the lower magnetic isolation sleeve, the valve ring seat is provided with a second circulation channel that is connected to the first circulation channel, a front-stage channel that connects the front-stage cavity with the first circulation channel is provided between the upper magnetic isolation sleeve and the lower magnetic isolation sleeve, a bias valve core is provided between the moving iron seat and the lower magnetic isolation sleeve, a bias spring is provided between the bias valve core and the moving iron seat, and the closing pressure is applied to the lower magnetic isolation sleeve through the bias spring, the outer wall of the bias valve core slides relative to the inner wall of the upper magnetic isolation sleeve, and can move axially in the front-stage cavity to control the disconnection or connection between the front-stage cavity and the front-stage channel.

2. A biasing solenoid valve assembly for a shock absorber according to claim 1, characterized in that: The outer peripheral surface of the offset valve core is provided with a plurality of annular grooves.

3. A biasing solenoid valve assembly for a shock absorber according to claim 2, characterized in that: A bias cavity is formed between the bias valve core and the moving iron seat, a bias exhaust hole for connecting the bias cavity with the front-stage channel is provided on the bias valve core, and a front-stage cavity control part extending toward one end of the main-stage valve is provided on the bias valve core.

4. The biasing solenoid valve assembly for a shock absorber according to claim 2, characterized in that: One end of the moving iron seat is tightly mounted on the upper magnetic isolation sleeve, and cooperates with the upper magnetic isolation sleeve to form a moving iron movable cavity for the moving iron assembly in the inner axial direction. The other end is provided with a moving iron step, and a clearance groove is present between the moving iron step and the inner wall of the upper magnetic isolation sleeve. The offset valve core is provided with an offset ring platform that can be inserted into the clearance groove corresponding to the clearance groove, and the inner side of the offset ring platform is provided with an offset limit surface that can be attached to the moving iron seat, and the intersection of the offset limit surface and the offset ring platform has an offset step that is compatible with the moving iron step.

5. The biasing solenoid valve assembly for a shock absorber according to claim 2, characterized in that: A first spring mounting groove is provided in the moving iron seat, a second spring mounting groove is provided at a position of the bias valve core corresponding to the first spring mounting groove, one end of the bias spring is tightly mounted in the first spring mounting groove and the other end is abutted against the second spring mounting groove, the front-stage valve comprises a valve head seat connected to the moving iron assembly, a front-stage valve head and a front-stage spring sheet arranged between the valve head seat and the front-stage valve head, one end of the front-stage valve head is abutted against the main-stage valve, and the other end is abutted against the front-stage spring sheet.

6. A biasing solenoid valve assembly for a shock absorber according to any one of claims 1 to 5, characterized in that: The first circulation channel runs straight through the lower magnetic isolation sleeve, and the upper magnetic isolation sleeve is provided with a step ring seat corresponding to the first circulation channel, the inner wall of the step ring seat forms an arc angle, and an annular protrusion extends from one end of the lower magnetic isolation sleeve in the direction of the front-stage valve, the end of the annular protrusion is higher than the first circulation channel, and the part connected to the first circulation channel has an arc-shaped guide portion, and the front-stage channel is formed between the arc-shaped guide portion and the step ring seat.

7. A biasing solenoid valve assembly for a shock absorber according to claim 6, characterized in that: A converging transition cavity is provided between the first circulation channel and the second circulation channel, a first diameter expansion portion is provided at one end of the first circulation channel corresponding to the converging transition cavity, and the inner wall of the first diameter expansion portion is connected to the first circulation channel at a circular arc angle, and a second diameter expansion portion is provided at one end of the second circulation channel corresponding to the converging transition cavity, and the inner wall of the second diameter expansion portion is connected to the second circulation channel at a circular arc angle.

8. The biasing solenoid valve assembly for a shock absorber according to claim 6, characterized in that: One end of the lower magnetic isolation sleeve is provided with a first threaded portion threadedly connected to the upper magnetic isolation sleeve, and the other end is provided with a second threaded portion threadedly connected to the valve ring seat, the second threaded portion has an adjustment step facing one end of the main-stage valve, one end of the valve ring seat is arranged to abut against the main-stage valve, and a valve ring damping adjustment component is provided on the valve ring seat, the valve ring damping adjustment component includes a valve stem inserted in the valve ring seat, a damping valve plate group sleeved on the outer circumferential surface of the valve stem, and a first damping channel opened on the valve ring seat and connected to the main-stage cavity, one end of the valve stem passes through the valve ring seat and is sleeved with the damping valve plate group, and then the damping valve plate group is pressed against the surface of the first damping channel, and the end of the lower magnetic isolation sleeve corresponding to the front-stage valve is provided with a guide hole for the central axis of the main-stage valve to pass through, the central axis is provided with an axial channel corresponding to the front-stage valve and transverse channels respectively connected to the axial channel and the main-stage cavity, and the main-stage valve is provided with a main cavity through groove connected to the transverse channel.

9. The biasing solenoid valve assembly for a shock absorber according to claim 6, characterized in that: There are several height adjustment gaskets or height adjustment springs between the first circulation channel and the second circulation channel. One end of the height adjustment gasket or height adjustment spring is against the lower magnetic isolation sleeve, and the other end is against the valve ring seat, and there is a through hole in the middle for the first circulation channel and the second circulation channel to communicate.

10. The biasing solenoid valve assembly for a shock absorber according to claim 6, characterized in that: The moving iron assembly includes a moving iron, a moving iron core shaft, a valve spring and a return spring. One end of the moving iron core shaft is interference-fitted inside the moving iron, and the other end extends out of the moving iron seat and the offset valve core and is fixedly connected to the previous valve. The end of the moving iron core shaft away from the previous valve is welded to the moving iron as a whole. The moving iron assembly is maintained in a predefined initial position by the valve spring and the return spring with opposite effects. The end of the moving iron seat corresponding to the return spring is provided with a limiting ring seat that is pre-tightened against the return spring, a gap is provided between the limiting ring seat and the moving iron core shaft, and a moving iron bushing is provided at the end of the limiting ring seat away from the return spring, the outer wall of the moving iron bushing is tightly fitted with the moving iron seat, and the inner wall slides against the moving iron core shaft.

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