Multi-coil multi-working-mode magnetorheological damper based on mixed mode

Abstract

The multi-coil multi-working-mode magneto-rheological shock absorber based on the mixed mode comprises a cylinder body, a piston assembly and a magneto-rheological piston, the piston assembly comprises a piston rod and a piston body, and the piston body comprises a piston end cover and the magneto-rheological piston. Each magnetorheological 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 magnetorheological pistons, and damping force output change is achieved by introducing corresponding currents into the electromagnetic coils on the different magnetorheological 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 all stages of 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 present invention relates to the technical field of vibration suppression, and in particular to a multi-coil multi-mode magnetorheological shock absorber based on a hybrid mode. Background Art

[0002] Magnetorheological fluid is a new type of intelligent material, which is composed of a non-magnetic base fluid, tiny magnetic particles with high magnetic conductivity and low magnetic hysteresis uniformly distributed therein, and additives. Under the action of an external magnetic field, its fluid characteristics can be continuously and reversibly transformed between the state of Newtonian fluid and the state of non-Newtonian fluid similar to solid within milliseconds, and it has a controllable and highly responsive dynamic shear yield stress.

[0003] Magnetorheological fluid has been widely used in shock absorbers to achieve vibration reduction effects. However, the traditional magnetorheological valve has a simple structure and a single effect. It can only output bidirectional symmetric damping force, and the applicable scenarios are limited, and it cannot meet all the requirements such as asymmetric damping.

[0004] In addition, for the Chinese patents applied by the inventor before, the Chinese invention patent with the publication number CN110778636A discloses a bidirectional independent controllable magnetorheological damper; the Chinese invention patent with the publication number CN110925349A discloses a self-sensing separated double-tube magnetorheological damper; the Chinese invention patent with the publication number CN110822009A discloses a separated double-tube magnetorheological damper. The above three invention patents have two electromagnetic coils, and their damping force has a large stretching and a small compression, and the stretching and compression are independently adjustable, but they cannot output damping forces in different working states with one structure, such as symmetric output, a large compression force and a small stretching force, and the application scenarios are narrow and the settings are relatively inflexible.

[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 modes of multi-stage coils to generate different magnetorheological effects, so as to achieve the vibration reduction effect under various working conditions. By changing whether each stage of coil is energized to meet various requirements, the working applicable range of the magnetorheological valve is greatly improved, and at the same time, the processing and manufacturing cost is reduced. Summary of the Invention

[0006] In view of this, the present invention provides a multi-coil multi-mode magnetorheological shock absorber based on a hybrid mode. A one-way valve is used to change the flow path of the magnetorheological fluid, and it is combined with different energization modes of multi-stage coils to generate different magnetorheological effects, so as to achieve the vibration reduction effect under various working conditions. By changing whether each stage of coil is energized to meet various requirements, the working applicable range of the magnetorheological valve is greatly improved, and at the same time, the processing and manufacturing cost is reduced.

[0007] The technical solution adopted by a multi-coil multi-mode magnetorheological shock absorber based on a hybrid mode provided by the present invention is as follows:

[0008] A multi-coil multi-mode magnetorheological shock absorber based on a hybrid mode, comprising:

[0009] A cylinder block;

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

[0011] The piston body includes a piston end cover and a magnetorheological piston, the magnetorheological piston is disposed 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 piston left body is provided, at least one piston right body is provided, and an electromagnetic coil is disposed on the magnetorheological piston. By passing corresponding currents through the electromagnetic coils on different magnetorheological pistons, the change of damping force output is realized;

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

[0013] Optionally, the damping channel includes a first damping channel, a second damping channel and a third damping channel. The cylinder block forms a first damping channel and a second damping channel for the magnetorheological fluid to flow on the left and right sides of the piston body respectively. A third damping channel is provided between the piston end cover and the magnetorheological piston and between two adjacent magnetorheological pistons. An intermediate channel communicating with the third damping channel is provided on the magnetorheological piston, and one-way valves are provided on the intermediate channels of the piston left body and the piston right body;

[0014] When the magnetorheological fluid flows from right to left, the one-way valve of the piston left body is driven to close the intermediate channel of the piston left body;

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

[0016] Optionally, the one-way valve includes a ball and an elastic member. The intermediate channel is a tapered through hole. The ball is disposed in the tapered through hole through the elastic member. The elastic member is used to apply a pre-tightening force to the ball in the direction close to the small end of the tapered through hole to drive the ball to close the small end of the tapered through hole. When the piston body stretches and compresses, the ball is in different positions in the tapered through hole under the action of the liquid pressure and the pre-tightening force of the spring, so as to open or close the intermediate channel of the magnetorheological piston.

[0017] Optionally, a floating piston is slidably disposed inside the cylinder body on the right side of the piston body, and an air chamber is formed between the right side of the floating piston and the cylinder body.

[0018] Optionally, an inflation port communicating with the air chamber is provided on the cylinder body.

[0019] Optionally, the middle body of the piston symmetrically distributes a left piston body and a right piston body along the axial direction of the electromagnetic coil of the middle body of the piston. A plurality of tapered through holes are symmetrically provided on the left piston body and the right piston body respectively along their circumferential directions.

[0020] Optionally, the cylinder body includes a shock absorber cylinder barrel, a shock absorber left end cover disposed on the left side of the shock absorber cylinder barrel, and a shock absorber right end cover disposed on the right side of the shock absorber cylinder barrel. A right lifting lug is provided on the right side of the shock absorber right end cover, a left lifting lug is provided on the piston rod, and the inflation port is located on the shock absorber right end cover.

[0021] 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.

[0022] Optionally, a fixing member is provided on the piston body, and the fixing member is used for axially fixing the magnetorheological piston.

[0023] Optionally, the piston end cover includes a left piston end cover and a right piston end cover. The right piston end cover is slidably disposed inside the cylinder body, and a fourth damping channel communicating with the second damping channel and the circumferential channel is provided on the right piston end cover.

[0024] In summary, the present invention includes at least one of the following beneficial technical effects:

[0025] 1. By cooperating with different energization modes of the multi-stage electromagnetic coils to generate different magnetorheological effects, the damping effect under various working conditions is realized. By changing whether each stage of the electromagnetic coil is energized to meet various requirements, the working application range of the magnetorheological valve is greatly improved, and at the same time, the processing and manufacturing cost is reduced;

[0026] 2. By changing the flow path of the magnetorheological fluid through the one-way valve and cooperating with different energization modes of the multi-stage electromagnetic coils to generate different magnetorheological effects, the damping effect under various working conditions is realized. The working application range of the magnetorheological valve is greatly improved, and at the same time, the processing and manufacturing cost is reduced. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 is the overall structural schematic diagram of an embodiment of the present invention;

[0028] Figure 2 is the structural schematic diagram of the left piston body of an embodiment of the present invention;

[0029] Figure 3 is a schematic structural diagram of the middle body of the piston in an embodiment of the present invention;

[0030] Figure 4 is a schematic structural diagram of the right body of the piston in an embodiment of the present invention;

[0031] Figure 5 is the flow path of the magnetorheological fluid when the magnetorheological piston is compressed in an embodiment of the present invention;

[0032] Figure 6 is the flow path of the magnetorheological fluid when the magnetorheological piston is stretched in an embodiment of the present invention;

[0033] Figure 7 is the flow path of the magnetorheological fluid when the magnetorheological piston is stretched after the coils of the left body and the middle body of the piston are energized in an embodiment of the present invention;

[0034] Figure 8 is the flow path of the magnetorheological fluid when the magnetorheological piston is compressed after the coils of the left body and the middle body of the piston are energized in an embodiment of the present invention;

[0035] Figure 9 is the flow path of the magnetorheological fluid when the magnetorheological piston is stretched after the coils of the middle body and the right body of the piston are energized in an embodiment of the present invention;

[0036] Figure 10 is the flow path of the magnetorheological fluid when the magnetorheological piston is compressed after the coils of the middle body and the right body of the piston are energized in an embodiment of the present invention;

[0037] Figure 11 is the flow path of the magnetorheological fluid when the magnetorheological piston is stretched after the coils of the left body and the right body of the piston are energized in an embodiment of the present invention;

[0038] Figure 12 is the flow path of the magnetorheological fluid when the magnetorheological piston is compressed after the coils of the left body and the right body of the piston are energized in an embodiment of the present invention;

[0039] Figure 13 is the flow path of the magnetorheological fluid when the magnetorheological piston is stretched after only the middle body of the piston is energized in an embodiment of the present invention;

[0040] Figure 14 is the flow path of the magnetorheological fluid when the magnetorheological piston is compressed after only the middle body of the piston is energized in an embodiment of the present invention;

[0041] Figure 15 is the flow path of the magnetorheological fluid when the magnetorheological piston is stretched after the left body, the middle body, and the right body of the piston are all energized in an embodiment of the present invention;

[0042] Figure 16This is the flow path of the magnetorheological fluid when the piston left body, piston middle body, and piston right body of the embodiment of the present invention are all electrified and the magnetorheological piston is compressed.

[0043] Explanation of reference numerals: 1. Left lifting lug; 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. Piston left body; 11. Electromagnetic coil; 12. Piston middle body; 13. Piston right body; 14. Helical 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. Inflation port; 22. Right lifting lug. Specific implementation manners

[0044] The following further elaborates on the present invention with reference to the Figures 1-16 accompanying drawings.

[0045] An embodiment of the present invention discloses a multi-coil multi-mode magnetorheological shock absorber based on a hybrid mode.

[0046] Embodiment 1

[0047] Referring to Figure 1 , Figure 2 , Figure 3 , Figure 4 , Figure 5 , Figure 6 , a multi-coil multi-mode magnetorheological shock absorber based on a hybrid mode includes a cylinder block, a piston assembly, and a magnetorheological piston. The piston assembly includes a piston rod 2 and a piston body disposed on the piston rod 2. The piston body is slidably disposed in the cylinder block. The piston body includes a piston end cover and a magnetorheological piston. The magnetorheological piston includes 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. An electromagnetic coil 11 is disposed on each magnetorheological piston. By passing corresponding currents through the electromagnetic coils 11 on different magnetorheological pistons, the change of damping force output is realized. A damping channel for the magnetorheological fluid 17 to flow is provided in the cylinder block and the magnetorheological piston. A circumferential channel for the magnetorheological fluid 17 to flow is formed between the magnetorheological piston and the inner wall of the cylinder block.

[0048] By cooperating with different energization modes of the multi-stage electromagnetic coils 11, different magnetorheological effects are generated to achieve the shock absorption effect under various working conditions. By changing whether the electromagnetic coils 11 of each stage are energized to meet various requirements, the working application range of the magnetorheological valve is greatly improved, and the manufacturing cost is reduced at the same time.

[0049] In addition, in the embodiment, during the stretching or compression process of the piston body, the magnetorheological fluid 17 in the circumferential channel generates a viscous throttling damping force and a shear damping force simultaneously, having a hybrid mode with two different damping forces, which greatly improves the working application range of the magnetorheological valve.

[0050] In this embodiment, the cylinder block includes a left shock absorber end cover 5, a shock absorber cylinder 6, and a right shock absorber end cover 20. The left shock absorber end cover 5 and the right shock absorber end cover 20 are respectively arranged on the left and right sides of the shock absorber cylinder 6. Specifically, the left shock absorber end cover 5 is hermetically connected to the shock absorber cylinder 6, and the right shock absorber end cover 20 is connected to the shock absorber cylinder 6 by welding. A right lifting lug 22 is arranged on the right side of the right shock absorber end cover 20. Specifically, the right lifting lug 22 is connected to the right shock absorber end cover 20 by welding. A left lifting lug 1 is arranged on the piston rod 2, and the left lifting lug 1 is connected to the piston rod 2 by a thread.

[0051] In this embodiment, the damping channels include a first damping channel, a second damping channel, and a third damping channel. The cylinder block forms a first damping channel and a second damping channel for the magnetorheological fluid 17 to flow on the left and right sides of the piston body respectively, and there is a third damping channel between the piston end cover and the magnetorheological piston and between two adjacent magnetorheological pistons.

[0052] In this embodiment, the piston end cover includes a left piston end cover 8 and a right piston end cover 16. The magnetorheological pistons are arranged between the left piston end cover 8 and the right piston end cover 16. The left piston end cover 8 is located on the left side of the magnetorheological piston, and the right piston end cover 16 is located on the right side of the magnetorheological piston. In this embodiment, the first damping channel is located on the left side of the left piston end cover 8, and the second damping channel is located on the right side of the right piston end cover 16. The right piston end cover 16 is slidably fitted in the shock absorber cylinder 6, and the inner diameter of the right piston end cover 16 is adapted to that of the shock absorber cylinder 6. The radial diameter of the left piston end cover 8 is smaller than that of the right piston end cover 16. There is a gap between the outer contour of the left piston end cover 8 and the inner wall of the shock absorber cylinder 6. The third damping channel of the left piston end cover 8 communicates with the middle channel of the left piston body 10, and the third damping channel of the right piston end cover 16 communicates with the middle channel of the right piston body 13.

[0053] In this embodiment, the right piston end cover 16 is provided with a fourth damping channel communicating with the second damping channel and the circumferential channel, and a plurality of the fourth damping channels are arranged at intervals along the circumferential direction of the right piston end cover 16.

[0054] In this embodiment, the magnetorheological piston includes a middle piston body 12, a left piston body 10 located on the left side of the middle piston body 12, and a right piston body 13 located on the right side of the middle piston body 12. At least one left piston body 10 is provided, and at least one right piston body 13 is provided. Preferably, the number of the left piston body 10 and the right piston body 13 is the same. In this embodiment, one left piston body 10 and one right piston body 13 are provided respectively. In this embodiment, a circumferential channel is formed between the left piston end cover 8, the middle piston body 12, the left piston body 10, the right piston body 13 and the inner wall of the shock absorber cylinder 6.

[0055] Among them, the axial lengths of the middle piston body 12, the left piston body 10 and the right piston body 13 can be the same or can be set differently. In this embodiment, preferably, the axial lengths of the middle piston body 12, the left piston body 10 and the right piston body 13 are the same, and the left piston body 10 and the right piston body 13 are symmetrically arranged along the middle part of the electromagnetic coil 11 of the middle piston body 12.

[0056] In this embodiment, the middle piston body 12, the left piston body 10 and the right piston body 13 are provided with coil grooves along their outer contours. The coil grooves are used for placing wires. In this embodiment, a through hole is provided in the middle of the piston rod 2. The wires are introduced into the interior through the through hole inside the piston rod 2 and wound around the coil groove positions of the corresponding magnetorheological pistons to form electromagnetic coils 11. The electromagnetic coils 11 corresponding to each magnetorheological piston can be individually energized, de-energized, and have independent current magnitudes. In other words, the electromagnetic coils 11 on the middle piston body 12, the left piston body 10 and the right piston body 13 can be energized and de-energized independently of each other without affecting each other, and the current magnitudes are also independently set. By connecting the corresponding electromagnetic coils 11 on the three magnetorheological pistons and passing the corresponding currents, the magnetorheological shock absorber is in different working modes, the damping force output is changed, different magnetorheological effects are generated, and the shock absorption effects under various working conditions are realized. By changing whether the electromagnetic coils 11 at each level are energized to meet various requirements, the working application range of the magnetorheological valve is greatly improved, and at the same time, the manufacturing cost is reduced.

[0057] 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.

[0058] In this embodiment, a sealing assembly is provided on the right piston end cover 16 for filling the gap between the right piston end cover 16 and the inner wall of the shock absorber cylinder 6.

[0059] In this embodiment, the piston rod 2 is connected to the left end cover 8 of the piston by a thread. A shoulder is provided on the piston rod 2, and through the mating connection with the left end cover 8 of the piston, it is used to limit the axial direction of the piston rod 2.

[0060] 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 left end cover 8 of the piston, and a boss is arranged on the left side of the left piston body 10, and the two cooperate to achieve the radial positioning of the left piston body 10; a groove arranged in a circle is provided on the right side of the left piston body 10, and a boss is arranged on the left side of the middle piston body 12, and the two cooperate to achieve the radial positioning of the middle piston body 12; a boss arranged in a circle is provided on the right side of the middle piston body 12, and a groove is arranged on the left side of the right piston body 13, and the two cooperate to achieve the radial positioning of the right piston body 13; a boss is provided on the left side of the right end cover 16 of the piston, and a groove is arranged on the right side of the right piston body 13, and the two cooperate to achieve the radial positioning of the right end cover 16 of the piston.

[0061] In order to further improve the axial positioning of the entire piston body, in this embodiment, a fixing member is provided on the piston body, and the fixing member is used to axially fix the magnetorheological piston; the fixing member fixes the magnetorheological piston between the left end cover 8 and the right end cover 16 of the piston. Specifically, the fixing member is a screw 9. A groove is provided on the left end cover 8 of the piston, and the screw 9 is installed here. Threaded holes are provided on the left piston body 10, the middle piston body 12, the right piston body 13, and the right end cover 16 of the piston. The left end cover 8, the left piston body 10, the middle piston body 12, the right piston body 13, and the right end cover 16 of the piston are connected by the screw 9, thereby achieving the axial positioning of the entire piston body.

[0062] A perforation for the piston rod 2 to slide axially is provided at the middle position of the left end cover 5 of the shock absorber. A guide ring and a sealing ring 4 are provided on the side wall of the perforation. 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 performance between the piston rod 2 and the left end cover 5 of the shock absorber.

[0063] A floating piston 18 is slidably fitted inside the shock absorber cylinder 6 and 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 sealing member is provided between the floating piston 18 and the shock absorber cylinder 6.

[0064] An air filling port 21 communicating with the air chamber is provided on the right end cover 20 of the shock absorber, and the shock absorber is filled with gas through the air filling port 21. In this embodiment, nitrogen gas 19 is injected into the air filling port 21, and an air filling 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 whole shock absorber through the air filling port 21.

[0065] In this embodiment, a check valve is provided on the magnetorheological piston to change the flow path of the magnetorheological fluid 17 inside the magnetorheological shock absorber, so as to achieve different damping force outputs. Specifically, an intermediate channel communicating with the damping channel three is provided on the magnetorheological piston, and check valves are provided on the intermediate channels of the left piston body 10 and the right piston body 13;

[0066] When the magnetorheological fluid 17 flows from right to left, the check valve of the left piston body 10 is driven to close the intermediate channel of the left piston body 10;

[0067] When the magnetorheological fluid 17 flows from left to right, the check valve of the right piston body 13 is driven to close the intermediate channel of the right piston body 13.

[0068] In this embodiment, the check valve includes a ball 15 and an elastic member. The intermediate channel is a tapered through hole. The ball 15 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 15 in the direction close to the small end of the tapered through hole, which can drive the ball 15 to close the small end of the tapered through hole. In this embodiment, the elastic member is a helical spring 14. When the piston body stretches and compresses, under the action of the hydraulic pressure and the pre-tightening force of the spring, the ball 15 is in different positions in the tapered through hole, so as to open or close the intermediate channel of the magnetorheological piston.

[0069] In this embodiment, the middle piston body 12 symmetrically distributes the left piston body 10 and the right piston body 13 along the axial direction of the electromagnetic coil 11 of the middle piston body 12. The left piston body 10 and the right piston body 13 are respectively symmetrically provided with a plurality of tapered through holes along their circumferential directions. Specifically, each of the left piston body 10 and the right piston body 13 is provided with four tapered through holes. In this embodiment, the left piston body 10 and the right piston body 13 are provided with tapered through holes, and balls 15 are arranged in the tapered through holes. The balls 15 cooperate with the helical springs 14 to function as check valves.

[0070] By energizing the corresponding electromagnetic coils 11 on the three magnetorheological pistons and passing the corresponding current, the magnetorheological shock absorber can be placed in different working modes, realizing the change of damping force output, thereby generating different magnetorheological effects to achieve the shock absorption effect under various working conditions. By changing whether the electromagnetic coils 11 at all levels are energized to meet various requirements, the working application range of the magnetorheological valve is greatly improved, and at the same time, the manufacturing cost is reduced. Passing the corresponding current through different electromagnetic coils 11 to place the magnetorheological shock absorber in different working modes is as follows:

[0071] Mode 1: When the electromagnetic coils 11 of the piston left body 10 and the piston middle body 12 are energized, at this time, under the input of the same current, the damping force in the tensile stroke is small, and the damping force in the compression stroke is large.

[0072] Refer to Figure 7 , in the tensile stroke, the magnetorheological fluid 17 enters the inside of the piston body from the middle channel and the circumferential channel of the piston left body 10, but the magnetorheological fluid 17 entering the inside of the piston body through the middle channel is not within the magnetic field range of the piston left body 10, so no magneto-damping force is generated.

[0073] Refer to Figure 8 , in the compression stroke, since the one-way valve of the piston left body 10 is in the closed state, the magnetorheological fluid 17 entering the inside of the piston body can only flow out from the circumferential channel. Therefore, all the magnetorheological fluid 17 entering the inside of the piston body flows through the magnetic field range of the coils on the piston left body 10 and the middle body, and a larger damping force is output outward.

[0074] Mode 2: When the electromagnetic coils 11 of the piston middle body 12 and the piston right body 13 are energized, at this time, under the input of the same current, the damping force in the tensile stroke is large, and the damping force in the compression stroke is small.

[0075] Refer to Figure 9 , in the tensile stroke, the magnetorheological fluid 17 enters the inside of the piston body from the middle channel and the circumferential channel of the piston. Since the one-way valve of the piston right body 13 is in the closed state, the magnetorheological fluid 17 entering the inside of the piston body can only flow out from the circumferential channel. Therefore, all the magnetorheological fluid 17 entering the inside of the piston body flows through the magnetic field range of the coils on the piston middle body 12 and the right body, and a larger damping force is output outward.

[0076] Refer to Figure 10 , in the compression stroke, the magnetorheological fluid 17 enters the inside of the piston body from the middle channel and the circumferential channel of the piston right body 13, but the magnetorheological fluid 17 entering the inside of the piston body through the middle channel is not within the magnetic field range of the piston right body 13, so no magneto-damping force is generated.

[0077] Mode Three: The electromagnetic coil 11 of the left piston body 10 and the right piston body 13 is energized. At this time, with the same current input, the damper outputs equal damping forces outward during the stretching and compression strokes.

[0078] Refer to Figure 11 , during the stretching stroke, the magnetorheological fluid 17 enters the inside of the piston body from the middle channel and the circumferential channel of the left piston body 10. However, the magnetorheological fluid 17 entering the inside of the piston body through the middle channel is not within the magnetic field range of the left piston body 10, so no magneto-induced damping force is generated.

[0079] Refer to Figure 12 , during the compression stroke, the magnetorheological fluid 17 enters the inside of the piston body from the middle channel and the circumferential channel of the right piston body 13. However, the magnetorheological fluid 17 entering the inside of the piston body through the middle channel is not within the magnetic field range of the right piston body 13, so no magneto-induced damping force is generated.

[0080] Mode Four: Only the electromagnetic coil 11 of the middle piston body 12 is energized

[0081] Refer to Figure 13 、 Figure 14 , the middle piston body 12 generates a large damping force. During the stretching and compression strokes, with the same current input, symmetric damping forces are output.

[0082] Mode Five: The electromagnetic coils 11 of the left piston body 10, the middle piston body 12, and the right piston body 13 are all energized

[0083] Refer to Figure 15 , during the stretching stroke, the magnetorheological fluid 17 enters the inside of the piston body from the middle channel and the circumferential channel of the left piston body 10.

[0084] Refer to Figure 16 , during the compression stroke, the magnetorheological fluid 17 enters the inside of the piston body from the middle channel and the circumferential channel of the right piston body 13.

[0085] During the stretching and compression strokes, with the same current input, symmetric damping forces are output.

[0086] Among them, in Mode Three, Mode Four, and Mode Five, the damping forces output outward during the stretching and compression strokes are the same. Among them, the damping force output outward in Mode Four is the smallest, and the damping force output outward in Mode Five is the largest.

[0087] The above are all the preferred embodiments of the present invention, and the protection scope of the present invention is not limited accordingly. Therefore: All equivalent changes made according to the structure, shape, and principle of the present invention should be covered within the protection scope of the present invention.

Claims

1. A multi-coil multi-operation-mode magnetorheological damper based on a hybrid mode, characterized in that: Comprising: Cylinder block; A piston assembly, the piston assembly includes a piston rod and a piston body disposed on the piston rod, and the piston body is slidably disposed within the cylinder block; The piston body includes a piston end cover and a magnetorheological piston, the magnetorheological piston is disposed 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 piston left body is provided, at least one piston right body is provided, and an electromagnetic coil is disposed on the magnetorheological piston. By passing corresponding currents through the electromagnetic coils on different magnetorheological pistons, the change of damping force output is realized; A damping channel for the magnetorheological fluid to flow is provided within the cylinder block and the magnetorheological piston, and a circumferential channel for the magnetorheological fluid to flow is formed between the magnetorheological piston and the inner wall of the cylinder block.

2. The multi-coil multi-operation-mode magnetorheological damper based on a hybrid mode according to claim 1, wherein: The damping channel includes a first damping channel, a second damping channel, and a third damping channel. The cylinder block forms a first damping channel and a second damping channel for the magnetorheological fluid to flow on the left and right sides of the piston body respectively. A third damping channel is provided between the piston end cover and the magnetorheological piston and between two adjacent magnetorheological pistons. An intermediate channel communicating with the third damping channel is provided on the magnetorheological piston, and one-way valves are provided in the intermediate channels on the piston left body and the piston right body; When the magnetorheological fluid flows from right to left, the one-way valve of the piston left body is driven to close the intermediate channel of the piston left body; When the magnetorheological fluid flows from left to right, the one-way valve of the piston right body is driven to close the intermediate channel of the piston right body.

3. The magnetorheological damper with multiple coils and multiple working modes based on a hybrid mode according to claim 2, wherein: The one-way valve includes a ball and an elastic member. The intermediate channel is a tapered through-hole. The ball is disposed in the tapered through-hole through the elastic member. The elastic member is used to apply a pre-tightening force to the ball in the direction close to the small end of the tapered through-hole, which can drive the ball to close the small end of the tapered through-hole. When the piston body stretches and compresses, the ball is in different positions in the tapered 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.

4. The multi-coil multi-operation-mode magnetorheological damper based on a hybrid mode according to claim 2, characterized in that: A floating piston is slidably disposed within the cylinder block and on the right side of the piston body, and an air chamber is formed between the right side of the floating piston and the cylinder block.

5. The magnetorheological shock absorber with multiple coils and multiple working modes based on a hybrid mode according to claim 4, wherein: An air inlet communicating with the air chamber is provided on the cylinder block.

6. The magnetorheological damper with multiple coils and multiple working modes based on a hybrid mode according to claim 3, wherein: The piston left body and the piston right body are symmetrically distributed along the axial direction of the electromagnetic coil of the piston middle body on the piston middle body, and a plurality of tapered through-holes are symmetrically provided on the piston left body and the piston right body respectively along their circumferential directions.

7. The magnetorheological shock absorber with multiple coils and multiple working modes based on a hybrid mode according to claim 5, characterized in that: The cylinder block includes a shock absorber cylinder barrel, a shock absorber left end cover disposed on the left side of the shock absorber cylinder barrel, and a shock absorber right end cover disposed on the right side of the shock absorber cylinder barrel. A right lifting lug is provided on the right side of the shock absorber right end cover, a left lifting lug is provided on the piston rod, and the air inlet is located on the shock absorber right end cover.

8. The multi-coil multi-operation mode magneto-rheological damper based on a hybrid mode according to claim 1, characterized in that: Limit parts for axially positioning adjacent components are provided between the piston end cover and the magnetorheological piston and between two adjacent magnetorheological pistons.

9. The multi-coil multi-operation mode magnetorheological damper based on a hybrid mode according to any one of claims 8, characterized in that: A fixing member is provided on the piston body, and the fixing member is used to axially fix the magnetorheological piston.

10. The multi-coil multi-operation-mode magnetorheological damper based on a hybrid mode according to any one of claims 2-9, 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 slidably disposed in the cylinder block, and a fourth damping channel communicating with the second damping channel and the circumferential channel is provided on the right piston end cover.

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