Multi-coil multi-working-mode magnetorheological damper with mixed mode

Abstract

The utility model discloses a multi-coil multi-working-mode magneto-rheological shock absorber with a mixed mode, which comprises a cylinder body, a piston assembly and a magneto-rheological piston, the piston assembly comprises a piston rod and a piston body, the piston body comprises a piston end cover and a magneto-rheological piston, and the magneto-rheological piston is arranged on the piston end cover. The magneto-rheological piston comprises a middle piston body, a left piston body located on the left side of the middle piston body and a right piston body located on the right side of the middle piston body, electromagnetic coils are arranged on the magneto-rheological piston, and damping force output change is achieved by introducing corresponding currents into the electromagnetic coils on different magneto-rheological pistons; damping channels allowing magnetorheological fluid to flow are formed in the cylinder body and the magnetorheological piston. Different magneto-rheological effects are generated through matching of different electrifying modes of the multistage electromagnetic coils, the damping effect under various working conditions is achieved, various requirements are met by changing whether the multistage electromagnetic coils are electrified or not, the working application range of the magneto-rheological valve is greatly widened, and meanwhile the machining and manufacturing cost is reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of vibration suppression, in particular to a multi-coil multi-working mode magnetorheological damper with a hybrid mode. Background Art

[0002] Magnetorheological fluid is a new type of intelligent material, composed of a non-magnetic base fluid, uniformly distributed within it tiny magnetic particles with high permeability and low hysteresis, and additives. Under the influence of an external magnetic field, its fluid properties can continuously and reversibly transition between a Newtonian fluid state and a solid-like non-Newtonian fluid state within milliseconds, exhibiting a controllable and highly responsive dynamic shear yield stress.

[0003] Magnetorheological fluids (MRFs) are widely used in shock absorbers to achieve vibration reduction. However, traditional MR valves have a simple structure and a single effect, only outputting bidirectional symmetrical damping force. Their applicability is limited and they cannot meet all requirements for asymmetric damping, among others.

[0004] In addition, the inventor applied for Chinese patents previously, namely, Chinese invention patent with publication number CN110778636A, which discloses a bidirectional independently controllable magnetorheological damper; Chinese invention patent with publication number CN110925349A, which discloses a self-sensing separated double-tube magnetorheological damper; Chinese invention patent with publication number CN110822009A, which discloses a separated double-tube magnetorheological damper. The above three invention patents have two electromagnetic coils, whose damping force is large in tension and small in compression, and the tension and compression are adjusted independently, but one structure cannot achieve damping force output in different working states, such as symmetrical output, large compression force, and small tension force. The application scenarios are narrow and the settings are relatively rigid.

[0005] Therefore, in order to solve the above technical problems, a one-way valve is used to change the flow path of the magnetorheological fluid, and it is combined with different energization methods of the multi-stage coil to produce different magnetorheological effects and achieve vibration reduction effects under various working conditions. By changing whether the coils at each stage are energized to meet various needs, the working scope of the magnetorheological valve is greatly improved, while reducing the processing and manufacturing costs. Utility Model Content

[0006] In view of this, the utility model provides a multi-coil multi-working mode magnetorheological damper with a hybrid mode, which changes the flow path of the magnetorheological fluid through a one-way valve and cooperates with different energization modes of the multi-stage coils to produce different magnetorheological effects and achieve vibration reduction effects under various working conditions. By changing whether the coils at each stage are energized to meet various needs, the working scope of the magnetorheological valve is greatly improved, while reducing processing and manufacturing costs.

[0007] The utility model provides a multi-coil multi-working mode magnetorheological damper with a hybrid mode, which adopts the following technical solutions:

[0008] A multi-coil multi-working mode magnetorheological damper with a hybrid mode, comprising:

[0009] Cylinder body;

[0010] A piston assembly, comprising a piston rod and a piston body disposed on the piston rod, wherein the piston body is slidably disposed in the cylinder;

[0011] The piston body includes a piston end cover and a magnetorheological piston. The magnetorheological piston is arranged on the piston end cover. The magnetorheological piston includes a piston middle body, a piston left body located on the left side of the piston middle body, and a piston right body located on the right side of the piston middle body. At least one left piston body is provided and at least one right piston body is provided. An electromagnetic coil is provided on the magnetorheological piston. By passing corresponding currents through the electromagnetic coils on different magnetorheological pistons, the damping force output is changed.

[0012] A damping channel for the flow of magnetorheological fluid is provided in the cylinder and the magnetorheological piston, and a circumferential channel for the flow of magnetorheological fluid is formed between the magnetorheological piston and the inner wall of the cylinder;

[0013] The magnetorheological piston is provided with an intermediate channel, and the intermediate channels on the left piston body and the right piston body are both provided with one-way valves.

[0014] Optionally, the damping channel includes damping channel 1, damping channel 2, and damping channel 3, the cylinder body forms damping channel 1 and damping channel 2 for the flow of magnetorheological fluid on the left and right sides of the piston body, respectively, and damping channel 3 is provided between the piston end cover and the magnetorheological piston and between two adjacent magnetorheological pistons;

[0015] When the magnetorheological fluid flows from right to left, the one-way valve of the left piston body is driven to close the middle channel of the left piston body;

[0016] When the magnetorheological fluid flows from left to right, the one-way valve of the right piston body is driven to close the middle channel of the right piston body.

[0017] Optionally, the one-way valve includes a ball and an elastic member, the intermediate channel is a conical through hole, the ball is arranged in the conical through hole through the elastic member, the elastic member is used to apply a pre-tightening force to the ball toward the small end close to the conical through hole, and the ball can be driven to close the small end of the conical through hole. When the piston body is stretched and compressed, the ball is placed in different positions in the conical through hole under the action of the liquid pressure and the pre-tightening force of the spring, thereby opening or closing the intermediate channel of the magnetorheological piston.

[0018] Optionally, the piston middle body, the piston left body and the piston right body are provided with coil grooves along their outer contours, and the coil grooves are used for placing wires.

[0019] Optionally, the cylinder body is provided with an inflation port communicating with the air chamber.

[0020] Optionally, the piston middle body has a left piston body and a right piston body symmetrically distributed along the axis of the electromagnetic coil of the piston middle body, and the left piston body and the right piston body are respectively provided with a plurality of tapered through holes symmetrically along their own circumferential directions.

[0021] Optionally, the cylinder body includes a shock absorber cylinder, a left end cover of the shock absorber arranged on the left side of the shock absorber cylinder, and a right end cover of the shock absorber arranged on the right side of the shock absorber cylinder, a right lifting ear is arranged on the right side of the right end cover of the shock absorber, a left lifting ear is arranged on the piston rod, and the inflation port is located at the right end cover of the shock absorber.

[0022] Optionally, a limiting portion for axially positioning adjacent components is provided between the piston end cover and the magnetorheological piston and between two adjacent magnetorheological pistons.

[0023] Optionally, a fixing piece is provided on the piston body, and the fixing piece is used to axially fix the magnetorheological piston.

[0024] Optionally, the piston end cover includes a left piston end cover and a right piston end cover, the right piston end cover is slidingly fitted in the cylinder body, and the right piston end cover is provided with a damping channel four connected to the damping channel two and the circumferential channel.

[0025] In summary, the present invention has at least one of the following beneficial technical effects:

[0026] 1. By coordinating different energizing modes of the multi-stage electromagnetic coils, different magnetorheological effects are generated to achieve vibration reduction effects under various working conditions. By changing whether the electromagnetic coils at each level are energized to meet various needs, the working range of the magnetorheological valve is greatly improved, while reducing processing and manufacturing costs;

[0027] 2. The one-way valve is used to change the flow path of the magnetorheological fluid, and is combined with different energization modes of the multi-stage electromagnetic coil to produce different magnetorheological effects, thereby achieving vibration reduction effects under various working conditions, greatly improving the working scope of the magnetorheological valve, and reducing processing and manufacturing costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 This is a schematic diagram of the overall structure of an embodiment of the utility model;

[0029] Figure 2This is a schematic structural diagram of the left piston body of an embodiment of the present utility model;

[0030] Figure 3 This is a schematic diagram of the main body structure of the piston in an embodiment of the utility model;

[0031] Figure 4 This is a schematic structural diagram of the right piston body of an embodiment of the present utility model;

[0032] Figure 5 This is the flow path of the magnetorheological fluid when the magnetorheological piston of the embodiment of the utility model is compressed;

[0033] Figure 6 This is the flow path of the magnetorheological fluid when the magnetorheological piston of the embodiment of the utility model is stretched;

[0034] Figure 7 This is the flow path of the magnetorheological fluid when the magnetorheological piston is stretched after the coils of the piston left body and the piston middle body are energized in the embodiment of the utility model;

[0035] Figure 8 This is the flow path of the magnetorheological fluid when the magnetorheological piston is compressed after the coils of the piston left body and the piston middle body are energized in the embodiment of the utility model;

[0036] Figure 9 This is the flow path of the magnetorheological fluid when the magnetorheological piston is stretched after the coils of the piston middle body and the piston right body of the embodiment of the utility model are energized;

[0037] Figure 10 This is the flow path of the magnetorheological fluid when the magnetorheological piston is compressed after the piston middle body and the piston right body coil are energized in the embodiment of the utility model;

[0038] Figure 11 This is the flow path of the magnetorheological fluid when the magnetorheological piston is stretched after the coils of the left and right piston bodies of the embodiment of the utility model are energized;

[0039] Figure 12 This is the flow path of the magnetorheological fluid when the magnetorheological piston is compressed after the coils of the left and right piston bodies of the embodiment of the utility model are energized;

[0040] Figure 13 This is the flow path of the magnetorheological fluid when the magnetorheological piston is stretched after only the piston body is energized in the embodiment of the utility model;

[0041] Figure 14 This is the flow path of the magnetorheological fluid when the magnetorheological piston is compressed after only the piston body is energized in the embodiment of the utility model;

[0042] Figure 15This is the flow path of the magnetorheological fluid when the magnetorheological piston is stretched after the left piston body, the middle piston body, and the right piston body of the embodiment of the utility model are all energized;

[0043] Figure 16 This is the flow path of the magnetorheological fluid when the magnetorheological piston is compressed after the left piston body, the middle piston body and the right piston body of the embodiment of the utility model are all energized.

[0044] Explanation of the accompanying symbols: 1. Left lifting ear; 2. Piston rod; 3. Guide copper ring; 4. Sealing ring; 5. Left end cover of shock absorber; 6. Shock absorber cylinder; 7. Sealing plug; 8. Left end cover of piston; 9. Screw; 10. Left body of piston; 11. Electromagnetic coil; 12. Middle body of piston; 13. Right body of piston; 14. Coil spring; 15. Ball; 16. Right end cover of piston; 17. Magnetorheological fluid; 18. Floating piston; 19. Nitrogen; 20. Right end cover of shock absorber; 21. Inflating port; 22. Right lifting ear. DETAILED DESCRIPTION

[0045] The following is combined with Figure 1-16 The utility model is described in further detail.

[0046] The embodiment of the utility model discloses a multi-coil multi-working mode magnetorheological vibration absorber with a hybrid mode.

[0047] Example 1

[0048] Reference Figure 1 、 Figure 2 、 Figure 3 、 Figure 4 、 Figure 5 、 Figure 6 , a multi-coil multi-working mode magnetorheological shock absorber with a hybrid mode, comprising a cylinder body, a piston assembly and a magnetorheological piston, the piston assembly comprising a piston rod 2 and a piston body arranged on the piston rod 2, the piston body being slidably fitted in the cylinder body, the piston body comprising a piston end cover and a magnetorheological piston, the magnetorheological piston comprising a piston middle body 12, a piston left body 10 located on the left side of the piston middle body 12 and a piston right body 13 located on the right side of the piston middle body 12, at least one piston left body 10 is provided, and at least one piston right body 13 is provided, each magnetorheological piston is provided with an electromagnetic coil 11, and the damping force output is changed by passing corresponding current through the electromagnetic coils 11 on different magnetorheological pistons; a damping channel for magnetorheological fluid 17 to flow is provided in the cylinder body and the magnetorheological piston, and a circumferential channel for magnetorheological fluid 17 to flow is formed between the magnetorheological piston and the inner wall of the cylinder.

[0049] By coordinating different energizing modes of the multi-stage electromagnetic coil 11, different magnetorheological effects are generated to achieve vibration reduction effects under various working conditions. By changing whether the electromagnetic coils 11 at each stage are energized to meet various needs, the working scope of the magnetorheological valve is greatly improved, while reducing processing and manufacturing costs.

[0050] In addition, in the embodiment, during the stretching or compression process of the piston body, the magnetorheological fluid 17 located in the circumferential channel will generate a viscous throttling damping force while generating a shear damping force, and has a mixed mode of two different damping forces, which greatly improves the working range of the magnetorheological valve.

[0051] In this embodiment, the cylinder body includes a left shock absorber end cap 5, a shock absorber cylinder 6, and a right shock absorber end cap 20. The left shock absorber end cap 5 and the right shock absorber end cap 20 are respectively disposed on the left and right sides of the shock absorber cylinder 6. Specifically, the left shock absorber end cap 5 is sealedly connected to the shock absorber cylinder 6, and the right shock absorber end cap 20 is connected to the shock absorber cylinder 6 by welding. A right lifting lug 22 is provided on the right side of the right shock absorber end cap 20. Specifically, the right lifting lug 22 is connected to the right shock absorber end cap 20 by welding. A left lifting lug 1 is provided on the piston rod 2, and the left lifting lug 1 is connected to the piston rod 2 via threads.

[0052] In this embodiment, the damping channel includes damping channel one, damping channel two and damping channel three. The cylinder body forms damping channel one and damping channel two for the flow of magnetorheological fluid 17 on the left and right sides of the piston body respectively. Damping channel three is provided between the piston end cover and the magnetorheological piston and between two adjacent magnetorheological pistons.

[0053] In this embodiment, the piston end caps include a left piston end cap 8 and a right piston end cap 16. The magnetorheological piston is disposed between the left piston end cap 8 and the right piston end cap 16. The left piston end cap 8 is located on the left side of the magnetorheological piston, and the right piston end cap 16 is located on the right side of the magnetorheological piston. In this embodiment, damping channel 1 is located on the left side of the left piston end cap 8, and damping channel 2 is located on the right side of the right piston end cap 16. The right piston end cap 16 is slidably disposed within the shock absorber cylinder 6. The right piston end cap 16 is adapted to the inner diameter of the shock absorber cylinder 6. The radial diameter of the left piston end cap 8 is smaller than the radial diameter of the right piston end cap 16. A gap is provided between the outer contour of the left piston end cap 8 and the inner wall of the shock absorber cylinder 6. The damping channel 3 of the left piston end cap 8 is in fluid communication with the middle channel of the left piston body 10, and the damping channel 3 of the right piston end cap 16 is in fluid communication with the middle channel of the right piston body 13.

[0054] In this embodiment, a damping channel four communicating with the damping channel two and the circumferential channel is provided on the right end cover 16 of the piston. A plurality of damping channels four are provided at intervals along the circumference of the right end cover 16 of the piston.

[0055] In this embodiment, the magnetorheological piston includes a piston middle body 12, a left piston body 10 located to the left of the piston middle body 12, and a right piston body 13 located to the right of the piston middle body 12. At least one left piston body 10 is provided, and at least one right piston body 13 is provided. Preferably, the left piston body 10 and the right piston body 13 are provided in equal numbers. In this embodiment, one left piston body 10 and one right piston body 13 are provided. In this embodiment, a circumferential channel is formed between the piston left end cap 8, the piston middle body 12, the left piston body 10, the right piston body 13, and the inner wall of the shock absorber cylinder 6.

[0056] Among them, the axial lengths of the piston middle body 12, the piston left body 10 and the piston right body 13 can be the same or different. In this embodiment, preferably, the axial lengths of the piston middle body 12, the piston left body 10 and the piston right body 13 are the same, and the piston left body 10 and the piston right body 13 are symmetrically arranged along the middle part of the electromagnetic coil 11 of the piston middle body 12.

[0057] In this embodiment, the piston center body 12, the left piston body 10, and the right piston body 13 are provided with coil slots along their outer contours for receiving wires. In this embodiment, a through-hole is provided in the middle portion of the piston rod 2. The wires are introduced through the through-hole within the piston rod 2 and wound around the coil slots of the corresponding MR pistons to form electromagnetic coils 11. Each MR piston's corresponding electromagnetic coil 11 can be individually energized and de-energized, and its current level can be independently adjusted. In other words, the electromagnetic coils 11 on the piston center body 12, the left piston body 10, and the right piston body 13 can be independently energized and de-energized without affecting each other, and their current levels can also be independently adjusted. By connecting the corresponding electromagnetic coils 11 on the three MR pistons and passing corresponding currents, the MR damper can be operated in different modes, achieving variable damping force output, thereby generating different MR effects and achieving vibration reduction effects under various operating conditions. By adjusting the energization of each electromagnetic coil 11 to meet various requirements, the MR valve's operating range is greatly expanded while reducing manufacturing costs.

[0058] In this embodiment, a sealing plug 7 is provided on the right side of the piston rod 2 . Specifically, the sealing plug 7 is a rubber plug, which can effectively improve the sealing performance of the piston rod 2 and effectively prevent the magnetorheological fluid 17 from leaking from the through hole of the piston rod 2 .

[0059] In this embodiment, a sealing assembly is provided on the piston right end cover 16 for filling the gap between the piston right end cover 16 and the inner wall of the shock absorber cylinder 6 .

[0060] In this embodiment, the piston rod 2 is connected to the piston left end cover 8 through a thread. A shaft shoulder is provided on the piston rod 2, which is connected with the piston left end cover 8 to limit the axial position of the piston rod 2.

[0061] In order to axially position the entire piston body, in this embodiment, a limiting portion for axially positioning adjacent components is provided between the piston end cover and the magnetorheological piston, and between two adjacent magnetorheological pistons. In this embodiment, the limiting portion is in the form of a boss and a groove. Specifically, a groove arranged along its circumference is provided on the right side of the piston left end cover 8, and a boss is provided on the left side of the piston left body 10, and the two cooperate to achieve radial positioning of the piston left body 10; a circumferential groove is provided on the right side of the piston left body 10, and a boss is provided on the left side of the piston middle body 12, and the two cooperate to achieve radial positioning of the piston middle body 12; a circumferential boss is provided on the right side of the piston middle body 12, and a groove is provided on the left side of the piston right body 13, and the two cooperate to achieve radial positioning of the piston right body 13; a boss is provided on the left side of the piston right end cover 16, and a groove is provided on the right side of the piston right body 13, and the two cooperate to achieve radial positioning of the piston right end cover 16.

[0062] To further improve the overall axial positioning of the piston body, in this embodiment, a fixing member is provided on the piston body to axially secure the magnetorheological piston; the fixing member secures the magnetorheological piston between the left piston end cap 8 and the right piston end cap 16. Specifically, the fixing member is a screw 9. The left piston end cap 8 is provided with a groove where the screw 9 is installed. The left piston body 10, the middle piston body 12, the right piston body 13, and the right piston end cap 16 are all provided with threaded holes. The screw 9 connects the left piston end cap 8, the left piston body 10, the middle piston body 12, the right piston body 13, and the right piston end cap 16, thereby achieving the overall axial positioning of the piston body.

[0063] A through hole is provided in the middle of the left end cover 5 of the shock absorber for the piston rod 2 to slide axially, and a guide ring and a sealing ring 4 are provided on the side walls of the through hole. In this embodiment, the guide ring is a guide copper ring 3, which is used to provide guidance for the sliding of the piston rod 2, and the sealing ring 4 is used to improve the sealing between the piston rod 2 and the left end cover 5 of the shock absorber.

[0064] A floating piston 18 is provided in the shock absorber cylinder 6 and is slidably fitted on the right side of the piston body. An air chamber is formed between the right side of the floating piston 18 and the shock absorber cylinder 6. In order to improve the sealing performance, a seal is provided between the floating piston 18 and the shock absorber cylinder 6.

[0065] An inflation port 21 connected to the air chamber is provided on the right end cover 20 of the shock absorber, and air is inflated into the interior of the shock absorber through the inflation port 21. In this embodiment, nitrogen 19 is injected into the inflation port 21, and an inflation valve is provided on the right end cover 20 of the shock absorber. The floating piston 18 is used to perform gas compensation on the entire shock absorber through the inflation port 21.

[0066] In this embodiment, a one-way valve is installed on the magnetorheological piston to change the flow path of the magnetorheological fluid 17 within the magnetorheological shock absorber, achieving different damping force outputs. Specifically, the magnetorheological piston has an intermediate channel that is in flow with the damping channel. The intermediate channels on both the left piston body 10 and the right piston body 13 are equipped with one-way valves.

[0067] When the magnetorheological fluid 17 flows from right to left, the one-way valve of the left piston body 10 is driven to close the middle channel of the left piston body 10;

[0068] When the magnetorheological fluid 17 flows from left to right, the one-way valve of the right piston body 13 is driven to close the middle channel of the right piston body 13 .

[0069] In this embodiment, the one-way valve comprises a ball 15 and an elastic member. The central passage is a tapered through-hole, into which the ball 15 is positioned by the elastic member. The elastic member applies a preload force toward the small end of the tapered through-hole, thereby driving the ball 15 to close the small end of the tapered through-hole. In this embodiment, the elastic member is a coil spring 14. During the extension and compression strokes of the piston body, the hydraulic pressure and the spring preload force cause the ball 15 to occupy different positions within the tapered through-hole, thereby opening or closing the central passage of the magnetorheological piston.

[0070] In this embodiment, the piston middle body 12 includes a left piston body 10 and a right piston body 13 symmetrically distributed along the axis of the electromagnetic coil 11 within the piston middle body 12. Each piston body 10 and the right piston body 13 are symmetrically provided with multiple tapered through-holes along their respective circumferences. Specifically, each piston body 10 and the right piston body 13 has four tapered through-holes. In this embodiment, the tapered through-holes are provided on the left and right piston bodies 10 and 13, and balls 15 are disposed in these tapered through-holes. These balls 15 cooperate with the coil spring 14 to function as one-way valves.

[0071] This utility model connects the corresponding electromagnetic coils 11 on the three magnetorheological pistons and passes corresponding currents, thereby placing the magnetorheological damper in different operating modes, achieving changes in damping force output, thereby producing different magnetorheological effects and achieving vibration reduction effects under various operating conditions. By changing whether the electromagnetic coils 11 at each level are energized to meet various needs, the operating range of the magnetorheological valve is greatly expanded while reducing processing and manufacturing costs. The magnetorheological damper is placed in different operating modes by passing corresponding currents through different electromagnetic coils 11, as shown below:

[0072] Mode 1: When the electromagnetic coil 11 of the piston left body 10 and the piston middle body 12 is energized, under the same current input, the damping force of the extension stroke is small, and the damping force of the compression stroke is large.

[0073] Reference Figure 7 During the stretching stroke, the magnetorheological fluid 17 enters the interior of the piston body from the middle channel and the circumferential channel of the left piston body 10, but the magnetorheological fluid 17 entering the interior of the piston body through the middle channel is not within the magnetic field range of the left piston body 10, so no magnetic damping force is generated.

[0074] Reference Figure 8 During the compression stroke, since the one-way valve of the left piston body 10 is in a closed state, the magnetorheological fluid 17 entering the piston body can only flow out from the circumferential channel. Therefore, the magnetorheological fluid 17 entering the piston body all flows through the magnetic field range of the left piston body 10 and the coil on the middle body, outputting a larger damping force outward.

[0075] Mode 2: The electromagnetic coils 11 of the piston middle body 12 and the piston right body 13 are energized. At this time, under the same current input, the damping force of the extension stroke is large, and the damping force of the compression stroke is small.

[0076] Reference Figure 9 During the stretching stroke, the magnetorheological fluid 17 enters the interior of the piston body from the piston middle channel and the circumferential channel. Since the one-way valve of the right piston body 13 is in a closed state, the magnetorheological fluid 17 entering the piston body can only flow out from the circumferential channel. Therefore, the magnetorheological fluid 17 entering the piston body all flows through the magnetic field range of the piston middle body 12 and the coil on the right body, outputting a larger damping force outward.

[0077] Reference Figure 10 During the compression stroke, the magnetorheological fluid 17 enters the interior of the piston body from the middle channel and the circumferential channel of the right piston body 13, but the magnetorheological fluid 17 entering the interior of the piston body through the middle channel is not within the magnetic field range of the right piston body 13, so no magnetic damping force is generated.

[0078] Mode 3: The electromagnetic coils 11 of the left piston body 10 and the right piston body 13 are energized. At this time, under the same current input, the damper outputs equal damping forces in the extension and compression strokes.

[0079] Reference Figure 11 During the stretching stroke, the magnetorheological fluid 17 enters the interior of the piston body from the middle channel and the circumferential channel of the left piston body 10, but the magnetorheological fluid 17 entering the interior of the piston body through the middle channel is not within the magnetic field range of the left piston body 10, so no magnetic damping force is generated.

[0080] Reference Figure 12 During the compression stroke, the magnetorheological fluid 17 enters the interior of the piston body from the middle channel and the circumferential channel of the right piston body 13, but the magnetorheological fluid 17 entering the interior of the piston body through the middle channel is not within the magnetic field range of the right piston body 13, so no magnetic damping force is generated.

[0081] Mode 4: Only the electromagnetic coil 11 of the piston body 12 is energized

[0082] Reference Figure 13 、 Figure 14 The piston body 12 generates a larger damping force, and outputs symmetrical damping forces under the same current input during the extension and compression strokes.

[0083] Mode 5: All electromagnetic coils 11 of the piston left body 10, the piston middle body 12 and the piston right body 13 are energized

[0084] Reference Figure 15 During the stretching stroke, the magnetorheological fluid 17 enters the interior of the piston body from the middle channel and the circumferential channel of the left piston body 10.

[0085] Reference Figure 16 During the compression stroke, the magnetorheological fluid 17 enters the interior of the piston body from the middle channel and the circumferential channel of the right piston body 13.

[0086] In the extension and compression strokes, symmetrical damping force is output under the same current input.

[0087] Among them, mode 3, mode 4, and mode 5 all output the same damping force in the extension and compression strokes, among which mode 4 outputs the smallest damping force, and mode 5 outputs the largest damping force.

[0088] The above are all preferred embodiments of the present invention, and are not intended to limit the scope of protection of the present invention. Therefore, any equivalent changes made based on the structure, shape, and principle of the present invention should be included in the scope of protection of the present invention.

Claims

1. A multi-coil, multi-working mode magnetorheological damper with a hybrid mode, characterized by: include: Cylinder body; A piston assembly, comprising a piston rod and a piston body disposed on the piston rod, wherein the piston body is slidably disposed in the cylinder body; The piston body includes a piston end cover and a magnetorheological piston. The magnetorheological piston is arranged on the piston end cover. The magnetorheological piston includes a piston middle body, a piston left body located on the left side of the piston middle body, and a piston right body located on the right side of the piston middle body. At least one left piston body is provided and at least one right piston body is provided. An electromagnetic coil is provided on the magnetorheological piston. By passing corresponding currents through the electromagnetic coils on different magnetorheological pistons, the damping force output is changed. The cylinder and the magnetorheological piston are provided with a damping channel for the magnetorheological fluid to flow, and a circumferential channel for the magnetorheological fluid to flow is formed between the magnetorheological piston and the inner wall of the cylinder; The magnetorheological piston is provided with an intermediate channel, and the intermediate channels on the left piston body and the right piston body are both provided with a one-way valve; A floating piston is provided in the cylinder body and on the right side of the piston body in a sliding manner. An air chamber is formed between the right side of the floating piston and the cylinder body.

2. The multi-coil, multi-working mode magnetorheological damper with hybrid mode according to claim 1, characterized in that: The damping channel includes damping channel 1, damping channel 2 and damping channel 3. The cylinder body forms damping channel 1 and damping channel 2 for the flow of magnetorheological fluid on the left and right sides of the piston body respectively. Damping channel 3 is provided between the piston end cover and the magnetorheological piston and between two adjacent magnetorheological pistons. When the magnetorheological fluid flows from right to left, the one-way valve of the left piston body is driven to close the middle channel of the left piston body; When the magnetorheological fluid flows from left to right, the one-way valve of the right piston body is driven to close the middle channel of the right piston body.

3. The multi-coil, multi-working mode magnetorheological damper with hybrid mode according to claim 2, characterized in that: The one-way valve includes a ball and an elastic member. The intermediate channel is a tapered through hole. The ball is arranged in the tapered through hole through the elastic member. The elastic member is used to apply a pre-tightening force to the ball toward the small end close to the tapered through hole, so as to drive the ball to close the small end of the tapered through hole. When the piston body is stretched and compressed, the ball is placed in different positions in the tapered through hole under the action of the hydraulic pressure and the pre-tightening force of the spring, thereby opening or closing the intermediate channel of the magnetorheological piston.

4. The multi-coil, multi-working mode magnetorheological damper with hybrid mode according to claim 1, characterized in that: The piston middle body, the piston left body and the piston right body are provided with coil grooves along their outer contours, and the coil grooves are used for placing wires.

5. The multi-coil multi-working mode magnetorheological damper with hybrid mode according to claim 1, characterized in that: The cylinder body is provided with an air charging port which is communicated with the air chamber.

6. The multi-coil, multi-working mode magnetorheological damper with hybrid mode according to claim 3, characterized in that: The piston middle body has a left piston body and a right piston body symmetrically distributed along the axial direction of the electromagnetic coil of the piston middle body. The left piston body and the right piston body are respectively provided with a plurality of tapered through holes symmetrically along their own circumferential directions.

7. The multi-coil, multi-working mode magnetorheological damper with hybrid mode according to claim 5, characterized in that: The cylinder body includes a shock absorber cylinder, a left end cover of the shock absorber arranged on the left side of the shock absorber cylinder, and a right end cover of the shock absorber arranged on the right side of the shock absorber cylinder. A right lifting ear is provided on the right side of the right end cover of the shock absorber, a left lifting ear is provided on the piston rod, and the inflation port is located at the right end cover of the shock absorber.

8. The multi-coil, multi-working mode magnetorheological damper with hybrid mode according to claim 1, characterized in that: A limiting portion for axially positioning adjacent components is provided between the piston end cover and the magnetorheological piston and between two adjacent magnetorheological pistons.

9. The multi-coil, multi-working mode magnetorheological damper with hybrid mode according to claim 8, characterized in that: The piston body is provided with a fixing piece, and the fixing piece is used to axially fix the magnetorheological piston.

10. The multi-coil, multi-working mode magnetorheological damper with hybrid mode according to any one of claims 2 to 9, characterized in that: The piston end cover includes a left piston end cover and a right piston end cover. The right piston end cover is slidingly fitted in the cylinder body. The right piston end cover is provided with a damping channel four connected to the damping channel two and the circumferential channel.

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