Magnetorheological piston valve assembly, magnetorheological shock absorber, suspension assembly and vehicle

Abstract

This utility model discloses a magnetorheological piston valve assembly, a magnetorheological shock absorber, a suspension assembly, and a vehicle. The magnetorheological piston valve assembly includes a piston assembly and a flow regulating assembly. The piston assembly includes a piston rod and a piston body, with the piston rod connected to the piston body. A first damping channel and a second damping channel are provided within the piston body, both extending from one end of the piston body to the other along the axial direction of the piston rod. The flow regulating assembly is installed on the piston body and is configured to regulate the flow rate of the magnetorheological fluid flowing out of the piston body along the second damping channel. This utility model solves the problem of limitations in the control of the piston damping force in magnetorheological shock absorbers.

Description

Technical Field

[0001] This application relates to the field of damping technology, and more particularly to a magnetorheological piston valve assembly, a magnetorheological damper, a suspension assembly, and a vehicle. Background Technology

[0002] A magnetorheological damper is an intelligent damping device based on magnetorheological fluid, mainly consisting of a cylinder, a piston, and an electromagnetic coil mounted on the piston. Damping force adjustment is based on the magnetorheological effect. When the electromagnetic coil of the magnetorheological damper is not energized, the magnetic particles of the magnetorheological fluid are randomly distributed, and the fluid flows freely. When the wheel moves the piston of the magnetorheological damper due to road bumps, the resistance of the magnetorheological fluid through the piston damping orifice is small, resulting in low output damping force, allowing for small, rapid vibrations of the vehicle body and improving comfort. When the electromagnetic coil is energized, it generates a magnetic field. Under the influence of the magnetic field, the magnetic particles quickly form a chain-like structure, hindering the fluid flow. When the vehicle passes over potholes or brakes suddenly, it moves the piston, significantly increasing the resistance of the magnetorheological fluid through the damping orifice, resulting in high output damping force, thereby suppressing severe vibrations of the vehicle body and quickly adapting to changes in road surface. During vehicle operation, the current in the electromagnetic coil is dynamically adjusted by the controller, changing the magnetic field strength. By utilizing the magnetic field to regulate the characteristics of the magnetorheological fluid, the damping force can be dynamically adjusted.

[0003] However, the damping force output by existing magnetorheological dampers tends to be relatively fixed, either too large or too small overall. There are still certain limitations in the control of the piston damping force of magnetorheological dampers at different vehicle speed ranges (especially at low speeds), resulting in poor damping control accuracy. Utility Model Content

[0004] This application provides a magnetorheological piston valve assembly, a magnetorheological shock absorber, a suspension assembly, and a vehicle to at least partially solve the aforementioned technical problems.

[0005] To achieve the above objectives, according to a first aspect of this application, a magnetorheological piston valve assembly is provided, comprising:

[0006] A piston assembly, comprising a piston rod and a piston body, wherein the piston rod is connected to the piston body, and the piston body is provided with a first damping channel and a second damping channel, both extending from one end of the piston body to the other end along the axial direction of the piston rod.

[0007] A flow regulating component is installed on the piston body and is configured to regulate the flow rate of magnetorheological fluid flowing out of the piston body along the second damping channel.

[0008] Optionally, the flow regulation component includes:

[0009] Mounting components;

[0010] A deformable sheet is mounted on the piston body via the mounting component and is at least partially located within the second damping channel. The deformable sheet can deform under the pressure of the magnetorheological fluid.

[0011] Optionally, the piston body includes:

[0012] A piston housing, wherein an installation cavity is provided inside the piston housing, and a first through-hole is provided on each opposite side along the axial direction of the piston rod, and a second through-hole and a third through-hole are also provided on each opposite side of the piston housing, respectively;

[0013] A valve core, which is located in the mounting cavity and has multiple flow channels, and a piston rod that passes through the piston housing and is connected to the valve core;

[0014] There is a first gap between the outer peripheral surface of the valve core and the inner peripheral surface of the mounting cavity. The first gap is connected to the first port to form the first damping channel. The second port, the multiple flow channels and the third port are interconnected to form the second damping channel. The deformable piece is located between the multiple flow channels and the third port and can deform towards or away from the valve core.

[0015] Optionally, the valve core has a second gap between the side away from the piston rod and the bottom wall of the mounting cavity. The second gap connects the multiple flow channels and the third port. The deformable piece is located in the second gap and covers the ports of the multiple flow channels near the second gap. The deformable piece has a distance between itself and the end face of the valve core, as well as between itself and the inner wall surface of the second gap away from the valve core.

[0016] Optionally, along the axial direction of the piston rod, the projected outer contour of the port of the flow channel near the second gap and the projected outer contour of the second port are both located within the projected outer contour of the second gap, wherein:

[0017] The deformable sheet includes a ring-shaped sheet structure; and / or,

[0018] The deformable sheet has a clearance hole extending through it along its thickness direction, and the clearance hole is connected to the third through-hole.

[0019] Optionally, the piston housing includes:

[0020] Piston rings; and

[0021] A cover plate component, the cover plate component including a first cover plate and a second cover plate, the first cover plate and the second cover plate are respectively disposed at opposite ends of the piston ring and surround the piston ring to form the mounting cavity, the first cover plate and the second cover plate are each provided with a first through-hole, the second through-hole is disposed in the first cover plate, and the third through-hole is disposed in the second cover plate;

[0022] Wherein, at least one of the first cover plate and the second cover plate is provided with a nested structure between itself and the valve core, and the nested structure fixes the valve core together with the first cover plate and the second cover plate.

[0023] Optionally, the nested structure includes:

[0024] A boss is provided on at least one of the first cover plate and the second cover plate on the side near the valve core;

[0025] The groove is recessed on the end face of the valve core near at least one of the first cover plate and the second cover plate. The ports of the multiple flow channels near the second cover plate are all located at the bottom of the groove. The groove is adapted to the boss and sleeved on the outer periphery of the boss. The second gap is located between the boss of the second cover plate and the bottom of the groove. The mounting component is press-fitted between the bottom of the groove and the boss.

[0026] Optionally, the mounting component includes:

[0027] First gasket; and

[0028] The second gasket is located radially along the piston rod. The first gasket and the second gasket are disposed on the outer periphery of the second gap away from the flow channel, and the outer edge of the deformable sheet is pressed between the first gasket and the second gasket.

[0029] Optionally, the second port includes at least four, which are arranged at intervals along the circumference of the piston body. The flow channel includes at least eight, which are arranged in pairs along the circumference of the piston body to form at least four flow channel pairs.

[0030] The four sets of flow channels are respectively connected to the four second ports in a one-to-one correspondence; and / or,

[0031] The spacing between two adjacent groups of flow channel pairs is greater than the spacing between the two flow channels in each group of flow channel pairs; and / or,

[0032] The second damping channel further includes at least four fourth ports. Along the axial direction of the piston rod, at least four fourth ports are disposed on the side of the piston housing away from the second port. The at least four fourth ports are arranged at intervals along the circumferential direction of the piston rod and are located between the first port and the third port. The at least four fourth ports are arranged in a one-to-one correspondence with at least four sets of flow channels. The orthographic projection of the at least four fourth ports along the axial direction of the piston rod is located on the deformable plate.

[0033] Optionally, the flow channel includes a first orifice section and a second orifice section, the first orifice section being located on the side of the second orifice section near the second through-hole and communicating with the second through-hole, the second orifice section extending axially along the piston rod, wherein:

[0034] Along the radial direction of the piston rod, the first bore section is inclined outward in a direction away from the axis of the second bore section; and / or,

[0035] The first hole segment includes a first segment and a second segment, the first segment is located between the second opening and the second segment, and the cross-section of the first segment is larger than the cross-section of the second segment.

[0036] According to a second aspect of this application, a magnetorheological damper is provided, including the aforementioned magnetorheological piston valve assembly.

[0037] According to a third aspect of this application, a suspension assembly is provided, including the aforementioned magnetorheological damper.

[0038] According to a fourth aspect of this application, a vehicle is provided, including the aforementioned suspension assembly.

[0039] The piston body of the magnetorheological piston valve assembly in this embodiment has a first damping channel and a second damping channel. The flow rate of the magnetorheological fluid in the first damping channel is greater than that in the second damping channel. After the piston body is installed in the cylinder of the magnetorheological damper, it will divide the cylinder into upper and lower chambers. During the compression and recovery movements of the piston body driven by the piston rod, the magnetorheological fluid will mainly flow from one chamber to the other along the first damping channel. Since the magnetorheological piston valve assembly also has a flow regulation component, when the first damping channel is fixed, the flow regulation component can adjust the flow rate of the magnetorheological fluid flowing out of the piston body along the second damping channel, thereby adjusting the damping force of the magnetorheological fluid through the second damping channel. Furthermore, the flow rate out of the piston body can be adjusted according to different speed ranges of the application product, thereby improving the precise control of the damping force during the piston body's recovery and compression strokes. The added flow regulation component breaks the limitation of magnetorheological dampers relying solely on the characteristics of magnetorheological fluid to control damping, and meets the adjustment needs of customers for damping force for different products.

[0040] Therefore, the magnetorheological piston valve assembly of this application can improve the precise control capability of the damping force during the recovery and / or compression processes of the magnetorheological damper, based on existing magnetorheological dampers. Especially during the development and tuning of new products, using piston bodies with the same first damping channel specification enables the adjustability of the damping force during the recovery and compression processes, thus meeting customer usage requirements within a wider range.

[0041] Other features and advantages of this application will be described in detail in the following detailed description section. Attached Figure Description

[0042] To more clearly illustrate the technical solutions in the embodiments of this application, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0043] To gain a more complete understanding of this application and its beneficial effects, the following description will be provided in conjunction with the accompanying drawings, wherein the same reference numerals in the following description denote the same parts.

[0044] Figure 1 This is a schematic diagram of the overall structure of the magnetorheological piston valve assembly provided in an exemplary embodiment of this disclosure;

[0045] Figure 2 for Figure 1 The right view;

[0046] Figure 3 for Figure 2 A cross-sectional view of the interior of the magnetorheological piston valve assembly (AA section).

[0047] Figure 4 for Figure 3 Enlarged schematic diagram of part B;

[0048] Figure 5 for Figure 1 A schematic diagram after removing the second cover plate;

[0049] Figure 6 for Figure 1 An explosion diagram;

[0050] Figure 7 for Figure 1 The structural diagram on the left;

[0051] Figure 8 This is a schematic diagram showing the valve core after removing the piston rod and the first cover plate.

[0052] Explanation of reference numerals in the attached figures:

[0053] 10. Piston rod; 20. Piston body; 201. First damping channel; 202. Second damping channel; 21. Piston housing; 101. First port; 102. Second port; 103. Third port; 104. Fourth port; 211. Piston ring; 212. First cover plate; 213. Second cover plate; 22. Valve core; 01. Flow channel; 011. First hole section; 111. First section; 112. Second section; 012. Second hole section; 221. Valve core body; 222. Electromagnetic coil; 02. First gap; 03. Second gap; 04. Positioning hole; 30. Flow regulating assembly; 31. Mounting component; 311. First gasket; 312. Second gasket; 32. Deformable piece; 321. Clearance hole; 40. Nested structure; 41. Boss; 42. Groove. Detailed Implementation

[0054] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of this application, and not all of them. All other embodiments obtained by those skilled in the art based on the embodiments of this application without creative effort are within the protection scope of this application.

[0055] In the technology based on the control of magnetorheological fluid characteristics, the magnitude trend of the restoring and compressive damping forces of the magnetorheological damper is usually determined by the size of the gap between the piston ring and the valve core 22 in the piston valve assembly (this gap is equivalent to the first gap 02 mentioned below in this utility model). When different products have different requirements for damping force control, the size of the gap is generally adjusted by matching piston rings with different inner diameter specifications to the magnetorheological damper. The larger the gap, the smaller the damping generated when the magnetorheological fluid passes through the large gap. The smaller the gap, the larger the damping generated when the magnetorheological fluid passes through the small gap. At the same time, in order to generate a relatively smooth damping force at low speeds, the inventors of this utility model have found through in-depth research that although an additional bypass hole can be opened on the valve core 22 to allow the magnetorheological fluid to flow between the two chambers of the magnetorheological damper cylinder separated by the piston. However, even after matching a piston ring of a certain specification, this technology still has certain limitations during adjustment. The output recovery and compression damping forces tend to be relatively fixed, either too large or too small overall. To change the output damping force, one can only select piston rings of other specifications and inner diameters to change the gap size. Moreover, the damping force has an overall trend, and there are still certain limitations in the precise control of the damping force at individual speed points.

[0056] To address the aforementioned issues, the first embodiment of this application provides a magnetorheological piston valve assembly. Please refer to [link to previous document]. Figures 1 to 8The magnetorheological piston valve assembly includes a piston assembly, which includes a piston rod 10 and a piston body 20. The piston rod 10 is connected to the piston body 20. The piston body 20 is provided with a first damping channel 201 and a second damping channel 202. Along the axial direction of the piston rod 10, both the first damping channel 201 and the second damping channel 202 extend from one end of the piston body 20 to the other end.

[0057] The magnetorheological piston valve assembly also includes a flow regulating component 30. The flow regulating component 30 is installed on the piston body 20 and is configured to regulate the flow rate of the magnetorheological fluid flowing out of the piston body 20 along the second damping channel 202.

[0058] After the piston body 20 is installed inside the cylinder of the magnetorheological damper, the cylinder can be divided into upper and lower chambers. The magnetorheological fluid can flow into the piston body 20 from one chamber along the first damping channel 201 and the second damping channel 202, and then flow out of the piston body 20 to enter the other chamber.

[0059] For example, during the return stroke of the piston body 20, the magnetorheological fluid flows from the upper chamber of the cylinder through the second damping channel 202 out of the piston body 20 and into the lower chamber. Since the flow regulating component 30 can control the flow rate of the magnetorheological fluid flowing out of the piston body 20 and into the lower chamber through the second damping channel 202, precise control of the damping force can be achieved through the cooperation of the flow regulating component 30 and the second damping channel 202, given a constant damping force of the first damping channel 201 on the magnetorheological fluid. To meet the damping force requirements of different vehicle speed ranges, the flow rate out of the piston body 20 can be adjusted using the flow regulating component 30, enabling precise control of the damping force at specific speed points. Furthermore, the trend of damping force variation can be changed without replacing the piston body 20 with a first damping channel 201 of different specifications.

[0060] As can be seen, the piston body 20 of the magnetorheological piston valve assembly in this embodiment of the application is provided with a first damping channel 201 and a second damping channel 202. The flow rate of the magnetorheological fluid in the first damping channel 201 is greater than the flow rate of the magnetorheological fluid in the second damping channel 202. After the piston body 20 is installed in the cylinder of the magnetorheological damper, it will divide the cylinder into upper and lower chambers. During the compression and recovery movements of the piston rod 10 pushing the piston body 20, the magnetorheological fluid will mainly flow from one chamber of the cylinder to the other along the first damping channel 201. The magnetorheological piston valve assembly also includes a flow regulation component 30. With the first damping channel 201 fixed, the flow regulation component 30 can adjust the flow rate of the magnetorheological fluid flowing out of the piston body 20 along the second damping channel 202. This adjusts the damping force of the magnetorheological fluid through the second damping channel 202, and the flow rate out of the piston body 20 can be adjusted according to different speed ranges of the application product, thereby improving the precise control of the damping force during the piston body 20's recovery and compression strokes. The added flow regulation component 30 overcomes the limitation of relying solely on the characteristics of the magnetorheological fluid to control damping in magnetorheological dampers, meeting the damping force adjustment needs of different customer products.

[0061] Therefore, the magnetorheological piston valve assembly of this application embodiment can improve the precise control capability of the damping force during the recovery and / or compression processes of the magnetorheological damper piston body 20, based on existing magnetorheological dampers. In particular, during the new product development and tuning process, using piston bodies 20 with the same first damping channel 201 can achieve adjustable damping force during the recovery and compression processes, thus meeting customer usage requirements within a wider range.

[0062] Please see Figures 3 to 6 In some embodiments, the flow regulating assembly 30 includes a mounting component 31 and a deformable plate 32. The deformable plate 32 is mounted to the piston body 20 via the mounting component 31 and is at least partially located within the second damping channel 202. The deformable plate 32 can deform under the pressure of the magnetorheological fluid. As the magnetorheological fluid flows from one chamber to another along the second damping channel 202, the deformable plate 32 deforms under the hydraulic pressure of the magnetorheological fluid, changing the size of the second damping channel 202 at the deformable plate 32 (e.g., increasing or decreasing, the magnitude of which can be determined according to the damping force adjustment requirements), thereby changing the flow rate of the magnetorheological fluid flowing out of the piston body 20. This enables precise output of the damping force of the piston body 20 at different speed ranges during the recovery process.

[0063] Therefore, in this embodiment, by installing a deformable plate 32 in the second damping channel 202 of the piston body 20, the deformation characteristics of the deformable plate 32 can be used to achieve precise control of the damping force. During the debugging of the magnetorheological damper, the damping force at different speed ranges during the piston body 20's recovery process can be precisely output simply by changing the specifications and number of the deformable plates 32. The specifications of the deformable plate 32 mainly include its thickness and maximum width (e.g., when the deformable plate 32 is annular, the maximum width can be the outer diameter of the deformable plate 32). For different speed ranges, if a larger deformation of the deformable plate 32 is required, the thickness of the deformable plate 32 can be reduced and / or the number of deformable plates 32 can be decreased. If a smaller deformation of the deformable plate 32 is required, the thickness of the deformable plate 32 can be increased and / or the number of deformable plates 32 can be increased. When the deformable sheet 32 ​​includes multiple sheets (such as two, three, four, etc.), the multiple deformable sheets 32 can be arranged sequentially along the flow direction of the magnetorheological fluid.

[0064] like Figure 3 , Figure 6 As shown, in some embodiments, the piston body 20 includes a piston housing 21 and a valve core 22. The piston housing 21 has a mounting cavity. Along the axial direction of the piston rod 10, a first through-hole 101 is provided on each opposite side of the piston housing 21. A second through-hole 102 and a third through-hole 103 are also provided on each opposite side of the piston housing 21. Both the second through-hole 102 and the third through-hole 103 are located inside the first through-hole 101 along the radial direction of the piston body 20, to fully utilize the space on both sides of the piston housing 21.

[0065] The valve core 22 is located in the mounting cavity and has multiple flow channels 01. The piston rod 10 passes through the piston housing 21 and is connected to the valve core 22. There is a first gap 02 between the outer peripheral surface of the valve core 22 and the inner peripheral surface of the mounting cavity. The first gap 02 is connected to the first port 101 to form a first damping channel 201.

[0066] like Figure 3 As shown, the second port 102, multiple flow channels 01, and the third port 103 are interconnected to form the second damping channel 202. A deformable plate 32 is located between the multiple flow channels 01 and the third port 103 and can deform towards or away from the valve core 22, allowing the deformable plate 32 to regulate the flow rate of the magnetorheological fluid entering the third port 103 or the multiple flow channels 01 after deformation. The multiple flow channels 01 ensure the total throughput of the magnetorheological fluid in the second damping channel 202, flexibly adapting to the damping force adjustment requirements of different products. The use of multiple flow channels 01 in conjunction with the deformable plate 32 overcomes the limitations of existing technology in damping force adjustment, enabling precise control of the damping force at individual speed points.

[0067] For example, during the piston body 20's recovery process, the magnetorheological fluid in the upper chamber of the cylinder can enter multiple flow channels 01 through the second port 102 and apply a certain hydraulic pressure to the deformable plate 32. Under the pressure, the deformable plate 32 deforms away from the valve core 22, thereby precisely controlling the flow rate of the magnetorheological fluid exiting from the multiple flow channels 01 and entering the lower chamber through the third port 103. The deformation amount of the deformable plate 32 can be adaptively adjusted based on its own specifications and quantity, as well as the number and size of the flow channels 01, achieving flexible control of the damping force without changing the dimensions of the piston body 20 and the valve core 22.

[0068] like Figure 4 As shown, in some embodiments, a second gap 03 exists between the side of the valve core 22 away from the piston rod 10 and the bottom wall of the mounting cavity. The second gap 03 connects the multiple flow channels 01 and the third port 103. The deformable piece 32 is located within the second gap 03 and covers the ports of the multiple flow channels 01 near the second gap 03. Furthermore, there is a gap between the deformable piece 32 and the end face of the valve core 22, as well as between the deformable piece 32 and the inner wall surface of the second gap 03 away from the valve core 22, so that the deformable piece 32 can deform in a direction closer to or farther from the valve core 22 under pressure.

[0069] In some embodiments, along the axial direction of the piston rod 10, the projected outer contour of the port of the flow channel 01 near the second gap 03 and the projected outer contour of the second port 102 are both located within the projected outer contour of the second gap 03. The deformable sheet 32 ​​includes an annular sheet structure. The orthographic projection of the annular sheet structure deformable sheet 32 ​​can include one of a circle, a polygon, or an ellipse. This deformable sheet 32 ​​structure is easy to assemble and can improve the assembly efficiency of the magnetorheological piston valve assembly. Furthermore, the deformable sheet 32 ​​has a clearance hole 321 through it along its thickness direction. The clearance hole 321 communicates with the third port 103, so that after the deformable sheet 32 ​​is deformed, the magnetorheological fluid can flow between the two chambers of the cylinder along the clearance hole 321 and the third port 103. In addition, the clearance hole 321 can also avoid the protruding structure in the middle of the end face of the valve core 22 near the third port 103, improving the structural compactness of the entire piston valve assembly.

[0070] In some embodiments, the piston housing 21 includes piston rings 211 and a cover plate component. For example... Figure 6 As shown, the cover plate component includes a first cover plate 212 and a second cover plate 213. The first cover plate 212 and the second cover plate 213 are respectively disposed at opposite ends of the piston ring 211 and surround the piston ring 211 to form an installation cavity.

[0071] The first cover plate 212 and the second cover plate 213 are both provided with a first opening 101. The second opening 102 is provided on the first cover plate 212, and the third opening 103 is provided on the second cover plate 213. The second opening 102 and the third opening 103 are easy to process.

[0072] Among them, at least one of the first cover plate 212 and the second cover plate 213 is provided with a nested structure 40 between the valve core 22 and the valve core 22. The nested structure 40 fixes the valve core 22 together with the first cover plate 212 and the second cover plate 213. The overall structure is efficient and convenient to assemble, and can improve the stability of the valve core 22 in the installation cavity.

[0073] like Figure 4 as well as Figure 6 As shown, in some embodiments, the nested structure 40 includes a boss 41 and a groove 42. The boss 41 is disposed on at least one of the first cover plate 212 and the second cover plate 213 on the side near the valve core 22. In this application, both the first cover plate 212 and the second cover plate 213 are provided with bosses 41.

[0074] A groove 42 is recessed on the end face of the valve core 22 near at least one of the first cover plate 212 and the second cover plate 213. In this application, grooves 42 are provided on the end faces of the valve core 22 at both opposite ends along its own axial direction. The ports of multiple flow channels 01 near the second cover plate 213 are all located at the bottom of the groove 42. The groove 42 is adapted to the boss 41 and sleeved on the outer periphery of the boss 41. The second gap 03 is located between the boss 41 of the second cover plate 213 and the bottom of the groove 42. The mounting component 31 is press-fitted between the bottom of the groove 42 and the boss 41.

[0075] Therefore, in this embodiment, while the valve core 22 is installed between the first cover plate 212 and the second cover plate 213 through the nested structure 40, a second gap 03 for installing the deformable piece 32 can be obtained. At the same time, the mounting component 31 is pressed between the groove 42 and the boss 41, and the deformable piece 32 can be stably and firmly installed in the second gap 03 without the need for additional fasteners, further improving the assembly efficiency of the overall piston valve assembly structure.

[0076] like Figure 4As shown, in some embodiments, the mounting component 31 includes a first gasket 311 and a second gasket 312. Along the radial direction of the piston rod 10, the first gasket 311 and the second gasket 312 are disposed on the outer periphery of the second gap 03 away from the flow channel 01 (i.e., disposed on the outer peripheral wall of the groove 42), and the outer edge of the deformable piece 32 is pressed between the first gasket 311 and the second gasket 312. Therefore, in this embodiment, by pressing and fixing the outer edge of the deformable piece 32 with the first gasket 311 and the second gasket 312 installed in the second gap 03, the deformable piece 32 can be installed, and the portion of the deformable piece 32 away from the first gasket 311 and the second gasket 312 can deform. In this process, when the second cover plate 213 is pressed together with the valve core 22 through the nesting structure 40, the first gasket 311 and the second gasket 312, which are pressed together with the deformable piece 32, are placed in the groove 42. This allows the deformable piece 32 to be firmly and reliably installed between the multiple flow channels 01 and the third port 103, making assembly convenient and efficient.

[0077] like Figure 6 As shown, in some embodiments, the first gasket 311 and the second gasket 312 can both be annular, thereby using the annular first gasket 311 and the second gasket 312 to stably press together the outer edges of the deformable sheet 32, improving the stability and reliability of the deformable sheet 32. Moreover, the annular structure of the first gasket 311 and the second gasket 312 makes assembly more efficient and convenient.

[0078] In some embodiments, the second ports 102 include at least four, and the at least four second ports 102 are arranged at intervals along the circumference of the piston body 20 on the first cover plate 212. The flow channels 01 include at least eight, and the at least eight flow channels 01 are arranged in pairs along the circumference of the piston body 20 to form at least four pairs of flow channels 01. Of course, in other embodiments, the combined pairs of flow channels 01 may include three flow channels 01, four flow channels 01, etc. Wherein:

[0079] The four sets of flow channels 01 are connected to the four second ports 102 one by one. Thus, while connecting the flow channels 01 to the second ports 102, the number of second ports 102 can be reduced, ensuring the structural strength of the piston housing 21 and its first cover plate 212, and without occupying a large space in the valve core 22.

[0080] The spacing between two adjacent pairs of flow channels 01 is greater than the spacing between the two flow channels 01 in each pair of flow channels 01, and the spacing between two adjacent pairs of flow channels 01 is equal. This makes the size of the second port 102 corresponding to each pair of flow channels 01 (such as the length of the second port 102 along the circumference of the piston housing 21) smaller.

[0081] like Figure 6As shown, the second damping channel 202 also includes at least four fourth ports 104. Along the axial direction of the piston rod 10, the at least four fourth ports 104 are disposed on the side of the piston housing 21 away from the second port 102. The at least four fourth ports 104 are arranged at intervals along the circumference of the piston rod 10 and are located between the first port 101 and the third port 103, and the at least four fourth ports 104 are corresponding one-to-one with at least four sets of flow channels 01. Furthermore, the orthographic projection of the at least four fourth ports 104 along the axial direction of the piston rod 10 is all located on the deformable plate 32, that is, the fourth port 104 is also the port through which the second damping channel 202 communicates with the lower chamber of the cylinder.

[0082] In some embodiments, the flow channel 01 includes a first orifice 011 and a second orifice 012. The first orifice 011 is located on the side of the second orifice 012 near the second port 102 and communicates with the second port 102. The second orifice 012 extends axially along the piston rod 10, wherein:

[0083] Along the radial direction of the piston rod 10, the first bore section 011 is inclined outward in a direction away from the axis of the second bore section 012. That is, there is an angle between the axes of the first bore section 011 and the second bore section 012, so as to make full use of the available space of the valve core 22 for machining the flow channel 01.

[0084] like Figure 3 As shown, the valve core 22 in this application mainly includes a valve core body 221, an electromagnetic coil 222 wound on the valve core 22, and a wire harness located inside the valve core body 221. The wire harness can pass through the hole opened in the middle of the piston rod 10 into the interior of the valve core body 221. The flow channel 01 of the above structure can be opened on the valve core body 221, which has a large space constraint, so as to make full use of the space available for the valve core body 221, without damaging the valve core body 221, and improving the production yield of the valve core body 221.

[0085] Among them, such as Figure 3 As shown, the first orifice 011 includes a first segment 111 and a second segment 112. The first segment 111 is located between the second through-hole 102 and the second segment 112, and the cross-section of the first segment 111 is larger than the cross-section of the second segment 112 to form a stepped orifice structure. For example, when the cross-sections of the first segment 111 and the second segment 112 are both circular, the inner diameter of the first segment 111 is larger than the inner diameter of the second segment 112. This ensures the flow rate of the magnetorheological fluid in the upper chamber into the multiple flow channels 01. Furthermore, when the first orifice 011 is inclined, the portion of the valve core body 221 located near the first cover plate 212 of the electromagnetic coil 222 can be fully utilized to open the first orifice 011 under the above structure.

[0086] In addition, this application may provide an elastic element (such as a spring) between the deformable sheet 32 ​​and the second cover plate 213 to provide a preload force to the deformable sheet 32 ​​through the elastic element, thereby further realizing flexible adjustment of the damping force.

[0087] As can be seen from the above, this application provides a novel magnetorheological piston valve assembly with adjustable damping force. During the recovery stroke of its piston body 20, this valve assembly can achieve precise adaptive control of the damping force through more flow channels 01 and a set of deformable plates 32 at the lower end of the valve core 22. By changing the specifications and number of deformable plates 32, more precise control of the damping force at different speed ranges can be achieved based on the same specifications of piston body 20.

[0088] For example, in some application embodiments, this application can add four sets of eight flow channels 01 radially to the valve core 22, and press a deformable plate 32 at the lower end of the valve core 22 through the first gasket 311 and the second gasket 312. The four sets of eight radially distributed flow channels 01 newly added to the valve core 22 in this application ensure the flow rate of magnetorheological fluid in the second damping channel 202. The deformable plate 32 is fixed at its edge by the first gasket 311 and the second gasket 312, and can deform under the pressure of the magnetorheological fluid during the recovery process of the piston body 20, thereby controlling the flow rate of the magnetorheological fluid out of the piston body 20, and thus realizing the regulation of the damping force. During debugging, the specifications and number of deformable plates 32 can be changed to achieve precise output of damping force at different speed ranges during the recovery process.

[0089] After the piston valve assembly is installed in the cylinder, the piston body 20 can reciprocate within the cylinder. During the movement of the piston body 20, the magnetorheological fluid flows between the upper and lower chambers of the cylinder along the first damping channel 201 and the second damping channel 202. By dynamically adjusting the current of the electromagnetic coil 222 on the valve core 22 through the controller on the vehicle, the magnetic field strength is changed. By utilizing the magnetic field to regulate the properties of the magnetorheological fluid, the damping force can be dynamically adjusted. Simultaneously, under the same piston body 20 specifications, the deformable plate 32 installed in the piston body 20 can meet the requirements for fine-tuning of the damping force during the piston's recovery process.

[0090] In some implementations, the main structure and assembly method of the magnetorheological piston valve assembly are as follows:

[0091] First, such as Figure 1The diagram shows the overall external structure of the piston valve assembly of this application. The piston valve assembly mainly consists of a piston housing 21, a valve core 22, a mounting component 31, and a deformable plate 32. The deformable plate 32 is placed between the first gasket 311 and the second gasket 312, which serve as the mounting component 31, and is installed on the lower end of the second cover plate 213 near the piston housing 21 of the valve core 22. The mounting component 31 is then contacted and fixed by the second cover plate 213. The piston ring 211 of the piston housing 21 is pressed and fixed to the first cover plate 212 and the second cover plate 213 in sequence.

[0092] like Figure 8 As shown, the valve core 22 has four sets of eight evenly distributed flow channels 01 and one positioning hole 04. The positioning hole 04 is located on the end face of the valve core 22 near the first cover plate 212. When installing the valve core 22, the positioning hole 04 can be made to cooperate with the positioning post on the hole post to achieve the positioning and assembly of the valve core 22. Considering the limited space available on the valve core 22, the first hole section 011 of the flow channel 01 needs to be set as a stepped hole structure with a certain angle to the axis of the second hole section 012.

[0093] like Figure 6 As shown, the first cover plate 212 has four elongated groove-shaped first openings 101 and second openings 102. The four second openings 102 are respectively aligned with and connected to the four sets of flow channels 01 of the valve core 22. The four first openings 101 are connected to the first gap 02 between the valve core 22 and the piston housing 21, and the four first openings 101 ensure the maximum flow rate of the magnetorheological fluid.

[0094] like Figure 6 As shown, the second cover plate 213 has four elongated groove-shaped fourth ports 104 and four first ports 101. The four fourth ports 104 are respectively arranged opposite to the four sets of flow channels 01 of the valve core 22. The four first ports 101 are connected to the first gap 02 to ensure the maximum flow rate of the magnetorheological fluid.

[0095] Both the first cover plate 212 and the second cover plate 213 have protrusions 41 on their inner sides near the valve core 22. The valve core 22 has grooves 42 that are adapted to the protrusions 41. The protrusions 41 and grooves 42 facilitate the efficient assembly of the valve core 22 and the mounting component 31.

[0096] The piston valve assembly provided in this application can improve the precise control capability of the damping force during the recovery process of the piston body 20, based on the existing magnetorheological damper. During the development and tuning of new damper products, when using piston rings 211 of the same specification, under the condition of a fixed first gap 02, the adjustability of the damping force during the recovery stroke can be achieved, changing the trend of the corresponding damping force's magnitude change, and thus meeting customer usage requirements within a wider range.

[0097] Therefore, this application breaks through the technical bottleneck of controlling damping force solely based on the properties of magnetorheological fluid by adding a deformable piece 32 to the lower end of the valve core 22. Under the condition of a fixed first gap 02, a change in the overall magnitude trend of the damping force is achieved.

[0098] The second embodiment of this application also provides a magnetorheological damper, which includes a magnetorheological piston valve assembly. For the specific structure and effect of the magnetorheological piston valve assembly, please refer to the content provided in the first embodiment of this utility model. This embodiment will not be repeated here.

[0099] The third embodiment of this application provides a suspension assembly that includes a magnetorheological damper. The structure of the magnetorheological damper can be found in the second embodiment of this utility model, and will not be repeated here.

[0100] The fourth embodiment of this application provides a vehicle that includes the suspension assembly provided in the third embodiment. This vehicle may include a gasoline-powered passenger vehicle, a plug-in hybrid passenger vehicle, or a new energy passenger vehicle, etc.

[0101] In the description of this application, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include one or more features. In the description of this application, "multiple" means two or more, unless otherwise explicitly specified.

[0102] In the above embodiments, the descriptions of each embodiment have different focuses. For parts not described in detail in a certain embodiment, please refer to the relevant descriptions in other embodiments.

[0103] The embodiments, implementation methods, and related technical features of this application can be combined and substituted for each other without conflict.

[0104] The above are merely preferred embodiments of this application and are not intended to limit this application in any way. Any simple modifications, equivalent changes, and alterations made to the above embodiments based on the technical essence of this application without departing from the scope of the technical solution of this application shall still fall within the scope of the technical solution of this application.

Claims

1. A magneto-rheological piston valve group, characterized in that include: A piston assembly, comprising a piston rod (10) and a piston body (20), wherein the piston rod (10) is connected to the piston body (20), and the piston body (20) is provided with a first damping channel (201) and a second damping channel (202), wherein along the axial direction of the piston rod (10), both the first damping channel (201) and the second damping channel (202) extend from one end of the piston body (20) to the other end; A flow regulating component (30) is installed on the piston body (20) and is configured to regulate the flow rate of magnetorheological fluid flowing out of the piston body (20) along the second damping channel (202).

2. The magnetorheological piston valve assembly according to claim 1, characterized in that, The flow regulation component (30) includes: Mounting component (31); A deformable plate (32) is mounted on the piston body (20) via the mounting component (31) and is at least partially located within the second damping channel (202). The deformable plate (32) can deform under the pressure of the magnetorheological fluid.

3. The magnetorheological piston valve assembly according to claim 2, characterized in that, The piston body (20) includes: Piston housing (21), the piston housing (21) is provided with an installation cavity, along the axial direction of the piston rod (10), the piston housing (21) is provided with a first through port (101) on both sides, and the piston housing (21) is also provided with a second through port (102) and a third through port (103) on both sides respectively. The valve core (22) is located in the mounting cavity and has multiple flow channels (01). The piston rod (10) passes through the piston housing (21) and is connected to the valve core (22). There is a first gap (02) between the outer peripheral surface of the valve core (22) and the inner peripheral surface of the mounting cavity. The first gap (02) is connected to the first port (101) to form the first damping channel (201). The second port (102), the multiple flow channels (01) and the third port (103) are interconnected to form the second damping channel (202). The deformable piece (32) is located between the multiple flow channels (01) and the third port (103) and can deform in a direction closer to or away from the valve core (22).

4. The magnetorheological piston valve assembly according to claim 3, characterized in that, The valve core (22) has a second gap (03) between the side away from the piston rod (10) and the bottom wall of the mounting cavity. The second gap (03) connects the multiple flow channels (01) and the third port (103). The deformable piece (32) is located in the second gap (03) and covers the ports of the multiple flow channels (01) near the second gap (03). The deformable piece (32) has a gap between the end face of the valve core (22) and the inner wall surface of the second gap (03) away from the valve core (22).

5. The magnetorheological piston valve assembly according to claim 4, characterized in that, Along the axial direction of the piston rod (10), the projected outer contour of the port of the flow channel (01) near the second gap (03) and the projected outer contour of the second port (102) are both located within the projected outer contour of the second gap (03), wherein: The deformable sheet (32) includes an annular sheet structure; and / or, The deformable sheet (32) has a clearance hole (321) extending through it along its thickness direction, and the clearance hole (321) is connected to the third port (103).

6. The magnetorheological piston valve assembly according to claim 4, characterized in that, The piston housing (21) includes: Piston rings (211); and A cover plate component, the cover plate component including a first cover plate (212) and a second cover plate (213), the first cover plate (212) and the second cover plate (213) are respectively disposed at opposite ends of the piston ring (211) and surround the piston ring (211) to form the mounting cavity, the first cover plate (212) and the second cover plate (213) are each provided with a first through opening (101), the second through opening (102) is disposed in the first cover plate (212), and the third through opening (103) is disposed in the second cover plate (213); Wherein, at least one of the first cover plate (212) and the second cover plate (213) is provided with a nesting structure (40) between it and the valve core (22), and the nesting structure (40) fixes the valve core (22) together with the first cover plate (212) and the second cover plate (213).

7. The magnetorheological piston valve assembly according to claim 6, characterized in that, The nested structure (40) includes: A boss (41) is provided on at least one of the first cover plate (212) and the second cover plate (213) on the side near the valve core (22); The groove (42) is recessed on the end face of the valve core (22) near at least one of the first cover plate (212) and the second cover plate (213). The ports of the multiple flow channels (01) near the second cover plate (213) are all located at the bottom of the groove (42). The groove (42) is adapted to the boss (41) and sleeved on the outer periphery of the boss (41). The second gap (03) is located between the boss (41) of the second cover plate (213) and the bottom of the groove (42). The mounting component (31) is press-fitted between the bottom of the groove (42) and the boss (41).

8. The magnetorheological piston valve assembly according to any one of claims 4 to 7, characterized in that, The mounting component (31) includes: First gasket (311); and The second gasket (312) is located radially along the piston rod (10). The first gasket (311) and the second gasket (312) are disposed on the outer periphery of the second gap (03) away from the flow channel (01). The outer edge of the deformable piece (32) is pressed between the first gasket (311) and the second gasket (312).

9. The magnetorheological piston valve assembly according to any one of claims 3 to 7, characterized in that, The second port (102) includes at least four, and the at least four second ports (102) are arranged at intervals along the circumference of the piston body (20). The flow channel (01) includes at least eight, and the at least eight flow channels (01) are arranged in pairs along the circumference of the piston body (20) to form at least four pairs of flow channels (01), wherein: The four sets of flow channels (01) are respectively connected to the four second ports (102) in a one-to-one correspondence; and / or, The spacing between two adjacent pairs of flow channels (01) is greater than the spacing between the two flow channels (01) in each pair of flow channels (01); and / or, The second damping channel (202) further includes at least four fourth ports (104). Along the axial direction of the piston rod (10), at least four fourth ports (104) are disposed on the side of the piston housing (21) away from the second port (102). At least four fourth ports (104) are arranged at intervals along the circumference of the piston rod (10) and are located between the first port (101) and the third port (103). At least four fourth ports (104) are arranged in a one-to-one correspondence with at least four sets of flow channels (01). The orthographic projection of at least four fourth ports (104) along the axial direction of the piston rod (10) is located on the deformable plate (32).

10. The magnetorheological piston valve assembly according to any one of claims 3 to 7, characterized in that, The flow channel (01) includes a first orifice section (011) and a second orifice section (012). The first orifice section (011) is located on the side of the second orifice section (012) near the second port (102) and communicates with the second port (102). The second orifice section (012) extends axially along the piston rod (10), wherein: Along the radial direction of the piston rod (10), the first bore section (011) is inclined outward in a direction away from the axis of the second bore section (012); and / or, The first hole segment (011) includes a first segment (111) and a second segment (112). The first segment (111) is located between the second through-hole (102) and the second segment (112), and the cross-section of the first segment (111) is larger than the cross-section of the second segment (112).

11. A magnetorheological damper, characterized in that, Includes the magnetorheological piston valve assembly as described in any one of claims 1 to 10.

12. A suspension assembly, characterized in that, Including the magnetorheological damper as described in claim 11.

13. A vehicle, characterized in that, Includes the suspension assembly as described in claim 12.

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