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

Abstract

The multi-coil multi-working-mode magnetorheological damper with the flowing mode comprises a cylinder body, a piston assembly and a magnetorheological device, the piston assembly comprises a piston rod and a sliding piston arranged on the piston rod, the sliding piston is arranged in the cylinder body in a sliding fit mode, and the magnetorheological device comprises a magnetorheological valve middle body. At least one magnetorheological valve left body is arranged on the left side of the magnetorheological valve middle body, at least one magnetorheological valve right body is arranged on the right side of the magnetorheological valve middle body, and an electromagnetic coil is arranged on the magnetorheological device; a first damping channel and a second damping channel are formed in the positions, on the left side and the right side of the sliding piston, of the cylinder body, and a third damping channel is formed in the magnetorheological device. 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 utility model relates to the technical field of vibration suppression, in particular to a multi-coil multi-working mode magnetorheological damper with flow modes. Background Art

[0002] Magnetorheological technology is widely used in the field of vibration suppression and has good vibration reduction effect and broad application prospects.

[0003] For conventional single-tube magnetorheological vibration reduction, the magnetorheological valve is usually a single-stage coil or a double-stage coil, and the damping force output is bidirectionally symmetrical. For some special application scenarios such as automobile suspension shock absorbers, there are also magnetorheological shock absorbers set to asymmetric output. The settings of these magnetorheological valves still cannot meet the needs of some special types of uses, such as uncertain scenarios where the damping force output in the tension and compression stroke is required. For example, at different time periods, symmetrical damping force, tension greater than compression damping force or compression greater than tension damping force output are required. Although this can be achieved through sensors and control algorithms, it will undoubtedly lead to increased costs and system complexity, which is not conducive to the promotion of magnetorheological technology.

[0004] 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 independently adjusted, but one structure cannot achieve damping force output in different working states, such as symmetrical output, large compression force, small tension force, narrow application scenarios, and relatively rigid settings.

[0005] Therefore, in response to the above technical problems, how to more conveniently increase the control range of the output damping force of the magnetorheological valve, effectively solve the application limitations of traditional magnetorheological valves, and facilitate the application and promotion of magnetorheological technology in the field of vibration reduction is a technical problem that urgently needs to be solved. Utility Model Content

[0006] In view of this, the utility model provides a multi-coil and multi-working mode magnetorheological shock absorber with flow modes. By passing corresponding currents through the coils on different pistons, the magnetorheological shock absorber is placed in different working modes, thereby increasing the control range of the output damping force of the magnetorheological valve, effectively solving the limited application of traditional magnetorheological valves, and facilitating the application and promotion of magnetorheological technology in the field of vibration reduction.

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

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

[0009] Cylinder body;

[0010] A piston assembly, the piston assembly comprising a piston rod and a sliding piston arranged on the piston rod, the sliding piston being drivably slidingly arranged in a cylinder body;

[0011] A magnetorheological device, the magnetorheological device comprising a magnetorheological valve body, at least one magnetorheological valve left body is arranged on the left side of the magnetorheological valve body, at least one magnetorheological valve right body is arranged on the right side of the magnetorheological valve body, and electromagnetic coils are correspondingly arranged on the magnetorheological device, and the damping force output is changed by passing corresponding currents through the electromagnetic coils on different magnetorheological devices;

[0012] The cylinder body forms a damping channel 1 and a damping channel 2 for the magnetorheological fluid to flow on the left and right sides of the sliding piston, respectively. The magnetorheological device is provided with a damping channel 3 for the magnetorheological fluid to flow.

[0013] The magnetorheological device is provided with an intermediate channel for three-way communication with the damping channel, and the intermediate channels on the left and right magnetorheological valve bodies are both provided with one-way valves;

[0014] A floating piston is provided in the cylinder body and on a side away from the piston rod in a sliding manner, and the left side of the floating piston is a damping channel 2.

[0015] Optionally, the one-way valve includes a ball and an elastic member, the middle 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 preload force to the ball in the direction of 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, and when the sliding piston is in the extension and compression stroke, the ball is located in different positions of the tapered through hole under the action of the liquid pressure and the preload force of the spring, thereby opening or closing the middle flow channel of the valve body.

[0016] Optionally, a gas passage is formed between the right side of the floating piston and the cylinder body, and a vent connected to the gas passage is provided on the cylinder body.

[0017] Optionally, the magnetorheological device is arranged in a sliding piston, and the sliding piston includes a piston sleeve, a piston left end cover arranged on the left side of the piston sleeve, and a piston right end cover arranged on the right side of the piston sleeve, and damping channels four are arranged on the piston left end cover and the piston right end cover. The magnetorheological device is a magnetorheological piston, and the magnetorheological piston is arranged between the piston left end cover, the piston sleeve and the piston right end cover. Damping channels three are formed between the magnetorheological piston and the piston left end cover, the piston sleeve and the piston right end cover, and between adjacent magnetorheological pistons.

[0018] Optionally, the magnetorheological valve body has a left magnetorheological valve body and a right magnetorheological valve body symmetrically distributed along the axial direction of the electromagnetic coil of the magnetorheological valve body, and the left magnetorheological valve body and the right magnetorheological valve body are respectively provided with a plurality of conical through holes symmetrically along their own circumferential directions.

[0019] Optionally, the cylinder body includes an outer cylinder, a left end cover of the shock absorber arranged on the left side of the outer cylinder, and a right end cover of the shock absorber arranged on the right side of the outer cylinder, a right lifting ear is arranged on the right side of the right end cover of the shock absorber, and a left lifting ear is arranged on the piston rod.

[0020] Optionally, the cylinder body includes an inner cylinder and an outer cylinder coaxially arranged outside the inner cylinder, the sliding piston and the floating piston are both slidingly arranged in the inner cylinder, and the outer cylinder and the inner cylinder are connected to form a gas channel.

[0021] Optionally, an elastic baffle is provided between the right body of the magnetorheological valve and the right end cover of the piston.

[0022] Optionally, it also includes a magnetorheological valve body, the two sides of which are respectively arranged on the outside of the cylinder body through a guide tube 1 and a guide tube 2, the magnetorheological device is arranged in the magnetorheological valve body, and a damping channel 3 is provided between the magnetorheological valve body and the magnetorheological device and between two adjacent magnetorheological devices; the damping channel 3 of the magnetorheological valve body on the left side is in communication with the damping channel 1 through the guide tube 1, and the damping channel 3 of the magnetorheological valve body on the right side is in communication with the damping channel 2 through the guide tube 2.

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

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

[0025] 1. Without using sensors and control algorithms, different energizing modes of multi-stage electromagnetic coils are used to produce different magnetorheological effects 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 scope of the magnetorheological valve is greatly improved, while the processing and manufacturing costs are reduced, effectively solving the problems of increased costs and system complexity, and is conducive to the promotion of magnetorheological technology;

[0026] 2. The one-way valve is used to change the flow path of the magnetorheological fluid, and it is matched with different energization methods of the multi-stage electromagnetic coil to produce different magnetorheological effects to achieve vibration reduction effects under various working conditions, which greatly improves the working application range of the magnetorheological valve and reduces the processing and manufacturing costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 It is a schematic diagram of the overall structure of a single-cylinder magnetorheological shock absorber according to Embodiment 1 of the present utility model; Figure 2 It is a schematic diagram of the overall structure of the left piston body of Example 1 of the utility model; Figure 3 This is a schematic diagram of the overall structure of the piston body in Example 1 of the utility model; Figure 4 It is a schematic diagram of the overall structure of the right piston body of Example 1 of the utility model; Figure 5 It is the flow path of the magnetorheological device during compression of Example 1 of the utility model; Figure 6 It is the flow path of the magnetorheological device during stretching of Example 1 of the utility model; Figure 7 It is the flow path of the magnetorheological fluid when the magnetorheological piston is stretched after the left body of the piston and the coil of the piston middle body of Example 1 of the utility model are energized; Figure 8 It is the flow path of the magnetorheological fluid when the magnetorheological piston is compressed after the left piston body and the piston middle body coil of Example 1 of the utility model are energized; Fig. 9 It is the flow path of the magnetorheological fluid when the magnetorheological piston is stretched after the piston middle body and the piston right body coil of Example 1 of the utility model are energized; Fig.10 It 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 of Example 1 of the utility model are energized; Fig.11 It is the flow path of the magnetorheological fluid when the magnetorheological piston is stretched after the coils of the left piston body and the right piston body of Example 1 of the utility model are energized; Fig.12 It is the flow path of the magnetorheological fluid when the magnetorheological piston is compressed after the coils of the left piston body and the right piston body of Example 1 of the utility model are energized; Fig.13 It is the flow path of the magnetorheological fluid when the magnetorheological piston is compressed after only the piston body is energized in Example 1 of the utility model; Fig.14 It is the flow path of the magnetorheological fluid when the magnetorheological piston is stretched after only the piston body is energized in Example 1 of the utility model; Fig.15 It 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 first embodiment of the utility model are all powered on; Fig.16 It 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 first embodiment of the utility model are all powered on; Fig.17 It is a schematic diagram of the overall structure of the double-cylinder magnetorheological shock absorber of Example 2 of the utility model; Fig.18 It is a schematic diagram of the overall structure of the left piston body of Example 2 of the utility model; Fig.19 This is a schematic diagram of the overall structure of the piston body in Example 2 of the utility model; Fig. 20 It is a schematic diagram of the overall structure of the right piston body of Example 2 of the utility model;

[0028] Fig.21 It is a schematic diagram of the overall structure of the double telescopic rod magnetorheological damper of Example 3 of the utility model; Fig. 22 It is the flow path when the piston rod of the magnetorheological device of Example 3 of the utility model is stretched; Fig.23 This is the flow path when the piston rod of the magnetorheological device of Example 3 of the utility model is compressed; Fig.24 It is the flow path of the magnetorheological fluid when the piston rod of the magnetorheological piston is stretched after the left valve body and the middle valve body coil of the utility model embodiment 3 are energized; Fig.25 It is the flow path of the magnetorheological fluid when the piston rod of the magnetorheological piston is compressed after the left valve body and the middle valve body coil of the utility model embodiment 3 are energized; Fig.26 It is the flow path of the magnetorheological fluid when the piston rod of the magnetorheological piston is stretched after the valve middle body and the valve right body coil of Example 3 of the utility model are energized; Fig. 27 It is the flow path of the magnetorheological fluid when the magnetorheological piston rod is compressed after the valve middle body and the valve right body coil of Example 3 of the utility model are energized; Fig.28 It is the flow path of the magnetorheological fluid when the piston rod of the magnetorheological piston is stretched after the coils of the left valve body and the right valve body of Example 3 of the utility model are energized; Fig.29 It is the flow path of the magnetorheological fluid when the piston rod of the magnetorheological piston is compressed after the coils of the left valve body and the right valve body of Example 3 of the utility model are energized; Fig.30 It is the flow path of the magnetorheological fluid when the piston rod of the magnetorheological piston is stretched after the valve body is energized in the third embodiment of the utility model; Fig.31 It is the flow path of the magnetorheological fluid when the piston rod of the magnetorheological piston is compressed after the valve body is energized in the embodiment 3 of the utility model; Fig.32 It is the flow path of the magnetorheological fluid when the piston rod of the magnetorheological piston is stretched after the valve left body, the valve middle body and the valve right body of Example 3 of the utility model are all powered on; Fig.33This is the flow path of the magnetorheological fluid when the shock absorber piston rod is compressed after the left valve body, the middle valve body and the right valve body of Example 3 of the utility model are all powered on.

[0029] Explanation of reference numerals: 1. left lifting ear; 2. piston rod; 3. guide copper ring; 4. sealing ring 1; 5. left end cover of shock absorber; 6. outer cylinder; 7. sealing plug; 8. left end cover of piston; 9. piston sleeve; 10. electromagnetic coil; 11. left body of piston; 12. middle body of piston; 13. spiral spring; 14. ball; 15. right body of piston; 16. elastic baffle; 17. right end cover of piston; 18. magnetorheological fluid; 19. floating piston; 20. nitrogen; 21. right end cover of shock absorber; 22. vent; 23. right Lifting ear; 24, sliding piston; 25, interface; 26, guide pipe joint; 27, guide pipe; 28, external right end cover; 29, valve right end cover; 30, screw; 31, valve right body; 32, valve middle body; 33, valve left body; 34, valve left end cover; 35, external cylinder; 36, elastic retaining ring for hole; 37, sealing ring 2; 38, sealing element; 39, inner cylinder; 40, damping channel 1; 41, damping channel 2; 42, damping channel 3; 43, damping channel 4; 44, air chamber; 45, magnetorheological device. DETAILED DESCRIPTION

[0030] The following is combined with Figure 1-33 The utility model is described in further detail.

[0031] The utility model embodiment discloses a multi-coil multi-working mode magnetorheological damper based on flow mode.

[0032] Example 1

[0033] Reference Figure 1-Figure 6A multi-coil multi-working mode magnetorheological shock absorber based on flow mode includes a cylinder body, a piston assembly and a magnetorheological device 45, the piston assembly includes a piston rod 2 and a sliding piston 24 arranged on the piston rod 2, the sliding piston 24 can be driven to slide and fit in the cylinder body, the magnetorheological device 45 includes a magnetorheological valve body 32, at least one magnetorheological valve left body 33 is arranged on the left side of the magnetorheological valve body 32, and at least one magnetorheological valve right body 31 is arranged on the right side of the magnetorheological valve body 32, and an electromagnetic coil 10 is correspondingly arranged on the magnetorheological device 45. By passing corresponding currents into the electromagnetic coils 10 on different magnetorheological devices 45, the damping force output is changed; the cylinder body forms a damping channel 1 40 and a damping channel 2 41 for the flow of magnetorheological fluid 18 on the left and right sides of the sliding piston 24, respectively, and a damping channel 3 42 for the flow of magnetorheological fluid 18 is arranged in the magnetorheological device 45. Without using sensors and control algorithms, different energization modes of the multi-stage electromagnetic coil 10 are coordinated to produce different magnetorheological effects to achieve vibration reduction effects under various working conditions. By changing whether the electromagnetic coils 10 at each stage are energized to meet various needs, the working scope of the magnetorheological valve is greatly improved, while the processing and manufacturing costs are reduced, effectively solving the problems of increased cost and system complexity, and is conducive to the promotion of magnetorheological technology.

[0034] In this embodiment, the magnetorheological device 45 is arranged in the sliding piston 24, and the sliding piston 24 includes a piston sleeve 9, a piston left end cover 8 arranged on the left side of the piston sleeve 9, and a piston right end cover 17 arranged on the right side of the piston sleeve 9, and a damping channel 43 is arranged on the piston left end cover 8 and the piston right end cover 17.

[0035] In this embodiment, the magnetorheological device 45 is a magnetorheological piston, specifically, the magnetorheological valve left body 33 is the piston left body 11, the magnetorheological valve middle body 32 is the piston middle body 12, and the magnetorheological valve right body 31 is the piston right body 15. The piston left body 11 located on the far left is arranged on the right side of the piston left end cover 8, the piston right body 15 located on the far right is arranged on the left side of the piston right end cover 17, and the piston middle body 12 is arranged between the piston left body 11 and the piston right body 15.

[0036] A damping channel 3 42 is formed between the magnetorheological piston and the piston left end cover 8, the piston sleeve 9 and the piston right end cover 17, and between adjacent magnetorheological pistons.

[0037] In this embodiment, at least one left piston body 11 is provided, and at least one right piston body 15 is provided. Preferably, the left piston body 11 and the right piston body 15 are provided in the same number. In this embodiment, one left piston body 11 and one right piston body 15 are provided respectively. Among them, the axial lengths of the piston middle body 12, the piston left body 11 and the piston right body 15 can be the same or different. In this embodiment, preferably, the axial lengths of the piston middle body 12, the piston left body 11 and the piston right body 15 are the same, and the piston left body 11 and the piston right body 15 are symmetrically arranged along the middle part of the electromagnetic coil 10 of the piston middle body 12.

[0038] A circumferential channel is formed between the magnetorheological piston and the piston sleeve 9 , and specifically, a circumferential channel is formed between the piston middle body 12 , the piston left body 11 , the piston right body 15 and the inner wall of the outer cylinder 6 .

[0039] In this embodiment, the piston middle body 12, the piston left body 11 and the piston right body 15 are provided with coil grooves along their outer contours, and the coil grooves are used to place wires. In this embodiment, a through hole is provided in the middle of the piston rod 2, and the wire is introduced into the interior through the through hole inside the piston rod 2, and is wound around the coil groove position of the corresponding magnetorheological piston to form an electromagnetic coil 10. The electromagnetic coil 10 corresponding to each magnetorheological piston can be powered on, powered off and independently set to an independent current. In other words, the electromagnetic coils 10 on the piston middle body 12, the piston left body 11 and the piston right body 15 can be powered on and off independently without affecting each other, and the current size is also independently set. By connecting the corresponding electromagnetic coils 10 on the three magnetorheological pistons and passing the corresponding current, the magnetorheological damper is placed in different working modes, and the damping force output is changed, thereby generating different magnetorheological effects, and achieving the damping effect under various working conditions. By changing whether the electromagnetic coils 10 at each level are powered on to meet various needs, the working application range of the magnetorheological valve is greatly improved, and the processing and manufacturing costs are reduced.

[0040] 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 18 from leaking from the through hole of the piston rod 2 .

[0041] In this embodiment, a sealing assembly is provided on the outer contour of the piston sleeve 9 to fill the gap between the piston sleeve 9 and the inner wall of the outer cylinder 6 , thereby effectively preventing the magnetorheological fluid 18 from flowing between the outer contour of the piston sleeve 9 and the inner wall of the outer cylinder 6 .

[0042] In this embodiment, the cylinder body includes an outer cylinder 6, a left end cover 5 of the shock absorber arranged on the left side of the outer cylinder 6, and a right end cover 21 of the shock absorber arranged on the right side of the outer cylinder 6, a right lifting ear 23 is arranged on the right side of the right end cover 21 of the shock absorber, and a left lifting ear 1 is arranged on the piston rod 2. The left end cover 5 of the shock absorber is connected to the outer cylinder 6 by threads, the right end cover 21 of the shock absorber is connected to the outer cylinder 6 by welding, the left lifting ear 1 is connected to the piston rod 2 by threads, and the right lifting ear 23 is connected to the right end cover 21 of the shock absorber by welding.

[0043] 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 wall of the through hole. In the present 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.

[0044] The piston rod 2 is connected to the piston left end cover 8 through a thread, and a shaft shoulder is provided on the piston rod 2, and the axial position of the piston rod 2 is positioned by cooperating with the piston left end cover 8.

[0045] The magnetorheological valve middle body 32 has a magnetorheological valve left body 33 and a magnetorheological valve right body 31 symmetrically distributed along the axial direction of the electromagnetic coil 10 of the magnetorheological valve middle body 32. The magnetorheological valve left body 33 and the magnetorheological valve right body 31 are respectively symmetrically provided with multiple conical through holes along their own circumferential directions.

[0046] In order to axially position the sliding piston 24 as a whole, 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 arranged on the left side of the piston left body 11, and the two cooperate to achieve the radial positioning of the piston left body 11; a circumferentially arranged groove is provided on the right side of the piston left body 11, and a boss is arranged on the left side of the piston middle body 12, and the two cooperate to achieve the radial positioning of the piston middle body 12; a circumferentially arranged boss is provided on the right side of the piston middle body 12, and a groove is arranged on the left side of the piston right body 15, and the two cooperate to achieve the radial positioning of the piston right body 15; both axial ends of the piston sleeve 9 extend radially in the direction of the axis to form a limiting flange, and the limiting flange forms a limit to the piston left end cover 8 and the piston right end cover 17 in the axial direction.

[0047] An elastic baffle 16 is provided between the right body 31 of the magnetorheological valve and the right end cover 17 of the piston. In this embodiment, the elastic baffle 16 is a rubber baffle. The rubber baffle has a certain elasticity. The piston sleeve 9 is pressed and matched with the left end cover 8, the right end cover 17, the magnetorheological piston and the elastic baffle 16 by limiting the flange, so as to realize the axial positioning of the sliding piston 24 as a whole.

[0048] A floating piston 19 is provided in the cylinder body and is located on the side away from the piston rod 2 in a sliding manner. The left side of the floating piston 19 is a damping channel 2 41. An air chamber 44 is formed between the right side of the floating piston 19 and the cylinder body. A vent 22 connected to the air chamber 44 is provided on the cylinder body. In this embodiment, the air chamber 44 is filled with nitrogen 20. A vent 22 is provided on the right end cover 21 of the shock absorber. The shock absorber is inflated through the vent 22. The floating piston 19 is used to perform gas compensation on the shock absorber as a whole through the vent 22. In this embodiment, an inflation valve is provided at the vent 22. In order to improve the sealing performance, a sealing rubber ring is provided between the floating piston 19 and the outer cylinder 6.

[0049] In this embodiment, the magnetorheological device 45 is provided with an intermediate channel communicating with the damping channel 3 42 , and the intermediate channels on the magnetorheological valve left body 33 and the magnetorheological valve right body 31 are both provided with a one-way valve;

[0050] When the magnetorheological fluid 18 flows from right to left, the one-way valve of the left magnetorheological valve body 33 is driven to close the middle channel of the left magnetorheological valve body 33;

[0051] When the magnetorheological fluid 18 flows from left to right, the one-way valve of the right magnetorheological valve body 31 is driven to close the middle channel of the right magnetorheological valve body 31 .

[0052] The one-way valve includes a ball 14 and an elastic member. The middle channel is a tapered through hole. The ball 14 is arranged in the tapered through hole through the elastic member. The elastic member is used to apply a preload force to the ball 14 in the direction of the small end close to the tapered through hole, so as to drive the ball 14 to close the small end of the tapered through hole. When the sliding piston 24 stretches and compresses, the ball 14 is located at different positions of the tapered through hole under the action of the hydraulic pressure and the preload force of the spring, thereby opening or closing the middle flow channel of the valve body.

[0053] The utility model connects the corresponding electromagnetic coils 10 on the three magnetorheological pistons and passes the corresponding current, so that the magnetorheological damper is in different working modes, realizes the change of damping force output, and thus produces different magnetorheological effects to achieve the vibration reduction effect under various working conditions. By changing whether the electromagnetic coils 10 at each level are energized to meet various needs, the working application range of the magnetorheological valve is greatly improved, and the processing and manufacturing cost is reduced. Corresponding currents are passed through different coils to put the magnetorheological damper in different working modes, as shown below:

[0054] Mode 1: When the electromagnetic coil 10 of the piston left body 11 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.

[0055] Reference Figure 7 During the stretching stroke, the magnetorheological fluid 18 enters the interior of the piston body from the middle channel and the circumferential channel of the left piston body 11, but the magnetorheological fluid 18 entering the interior of the piston body through the middle channel is not within the magnetic field range of the left piston body 11, so no magnetic damping force is generated.

[0056] Reference Figure 8 In the compression stroke, since the one-way valve of the left piston body 11 is in a closed state, the magnetorheological fluid 18 entering the piston body can only flow out from the circumferential channel. Therefore, the magnetorheological fluid 18 entering the piston body all flows through the magnetic field range of the electromagnetic coil 10 on the left piston body 11 and the middle body, and outputs a larger damping force outward.

[0057] Mode 2: The electromagnetic coil 10 of the piston middle body 12 and the piston right body 15 is 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.

[0058] Reference Fig. 9 During the stretching stroke, the magnetorheological fluid 18 enters the interior of the piston body from the piston middle channel and the circumferential channel. Since the one-way valve of the piston right body 15 is in a closed state, the magnetorheological fluid 18 entering the piston body can only flow out from the circumferential channel. Therefore, the magnetorheological fluid 18 entering the piston body all flows through the magnetic field range of the piston middle body 12 and the coil on the right body, and outputs a larger damping force outward.

[0059] Reference Fig.10 During the compression stroke, the magnetorheological fluid 18 enters the interior of the piston body from the middle channel and the circumferential channel of the right piston body 15, but the magnetorheological fluid 18 entering the interior of the piston body through the middle channel is not within the magnetic field range of the right piston body 15, so no magnetic damping force is generated.

[0060] Mode three: the electromagnetic coil 10 of the piston left body 11 and the piston right body 15 is energized. At this time, under the same current input, the damper outputs equal damping forces in the extension and compression strokes.

[0061] Reference Fig.11 During the stretching stroke, the magnetorheological fluid 18 enters the interior of the piston body from the middle channel and the circumferential channel of the left piston body 11, but the magnetorheological fluid 18 entering the interior of the piston body through the middle channel is not within the magnetic field range of the left piston body 11, so no magnetic damping force is generated.

[0062] Reference Fig.12 During the compression stroke, the magnetorheological fluid 18 enters the interior of the piston body from the middle channel and the circumferential channel of the right piston body 15, but the magnetorheological fluid 18 entering the interior of the piston body through the middle channel is not within the magnetic field range of the right piston body 15, so no magnetic damping force is generated.

[0063] Mode 4: Only the electromagnetic coil 10 of the piston body 12 is energized

[0064] Reference Fig.13 , Fig.14 The piston body 12 generates a larger damping force, and outputs symmetrical damping force under the same current input during the extension and compression strokes.

[0065] Mode 5: The electromagnetic coils 10 of the piston left body 11, the piston middle body 12 and the piston right body 15 are all energized.

[0066] Reference Fig.15 During the stretching stroke, the magnetorheological fluid 18 enters the interior of the piston body from the middle channel and the circumferential channel of the left piston body 11.

[0067] Reference Fig.16 In the compression stroke, the magnetorheological fluid 18 enters the interior of the piston body from the middle channel and the circumferential channel of the right piston body 15 .

[0068] In the extension and compression strokes, symmetrical damping force is output under the same current input.

[0069] Among them, mode three, mode four, and mode five all output the same damping force in the extension and compression strokes, among which mode four has the smallest damping force output, and mode five has the largest damping force output.

[0070] Example 2

[0071] Reference Figure 17-Figure 20 The difference between this embodiment and embodiment 1 is that the cylinder body is a double cylinder consisting of an inner cylinder 39 and an outer cylinder 6.

[0072] The cylinder body includes an inner cylinder 39 and an outer cylinder 6 coaxially arranged outside the inner cylinder 39. The sliding piston 24 and the floating piston 19 are both slidingly arranged in the inner cylinder 39. The outer cylinder 6 and the inner cylinder 39 are connected to form an air chamber 44.

[0073] The left end cover 5 of the shock absorber is connected and fixed to the outer cylinder 6 through a hole with an elastic retaining ring 36. A seal 38 is arranged between the inner cylinder 39 and the left end cover 5 of the shock absorber. The floating piston 19 is arranged at the inner cylinder 39. The right end cover 21 of the shock absorber is welded to the outer cylinder 6 and the right lifting ring.

[0074] The right end cover 21 of the shock absorber is provided with a partial through slot and an air charging port, and the valve core of the air charging port can be an L-shaped interface 25 .

[0075] In this embodiment, the magnetorheological shock absorber adopts a double-cylinder design, and the gas inside the magnetorheological shock absorber can flow between the inner cylinder 39, the outer cylinder 6 and inside the inner cylinder 39, thereby greatly reducing the overall axial size of the shock absorber and improving the structural compactness of the magnetorheological shock absorber and its adaptability to different scenarios.

[0076] Example 3

[0077] Reference Fig.21 , reference Fig. 22 , reference Fig.23 The difference between this embodiment and embodiment 1 is that the magnetorheological device 45 is placed outside the cylinder body.

[0078] In the present embodiment, a magnetorheological valve body is also included, and the two sides of the magnetorheological valve body are respectively arranged on the outside of the cylinder body through a guide tube 27-1 and a guide tube 27-2, and a magnetorheological device 45 is arranged in the magnetorheological valve body. A damping channel three 42 is provided between the magnetorheological valve body and the magnetorheological device 45 and between two adjacent magnetorheological devices 45; the damping channel three 42 of the magnetorheological valve body on the left side is communicated with the damping channel one 40 through the guide tube 27-1, and the damping channel three 42 of the magnetorheological valve body on the right side is communicated with the damping channel two 41 through the guide tube 27-2.

[0079] The magnetorheological device 45 is a magnetorheological valve body, including a valve center body 32, a left valve body 33 located on the left side of the valve center body 32, and a right valve body 31 located on the right side of the valve center body 32. At least one left valve body 33 is provided, and at least one right valve body 31 is provided. An electromagnetic coil 10 is correspondingly provided on the magnetorheological device 45. By passing corresponding currents through the electromagnetic coils 10 on different valve bodies, the damping force output is changed.

[0080] In this embodiment, one valve left body 33 and one valve right body 31 are provided. The axial lengths of the valve middle body 32, the valve left body 33 and the valve right body 31 can be the same or different. In this embodiment, preferably, the axial lengths of the valve middle body 32, the valve left body 33 and the valve right body 31 are the same, and the valve left body 33 and the valve right body 31 are symmetrically arranged along the middle of the electromagnetic coil 10 of the valve middle body 32.

[0081] In this embodiment, the magnetorheological valve body includes an external cylinder 35 and an external right end cover 28, and the external cylinder 35 and the external right end cover 28 are connected by threads; both the external cylinder 35 and the external right end cover 28 are provided with threads for cooperating with the guide pipe joint 26 for installation.

[0082] In this embodiment, a left valve end cover 34 is provided on the left side of the left valve body 33, and a right valve end cover 29 is provided on the right side of the right valve body 31. A groove is provided on the external cylinder 35, and a protrusion is provided on the left valve end cover 34, which is used to radially position the left valve end cover 34. A circumferentially arranged groove is provided on the right side of the left valve end cover 34, which is used to cooperate with the boss arranged on the left side of the left valve body 33 to achieve radial positioning of the left valve body 33. A circumferentially arranged groove is provided on the right side of the left valve body 33, which is used to cooperate with the boss on the left side of the middle valve body 32 to achieve radial positioning of the middle valve body 32, and a circumferentially arranged boss is provided on the right side of the middle valve body 32, which is used to cooperate with the groove on the left side of the right valve body 31 to achieve radial positioning of the right valve body 31. The left end cover 34 of the valve is provided with a groove, and the screw 30 is installed here; the left body 33 of the valve, the middle body, the right body, and the right end cover 29 of the valve are all provided with threaded holes; the left end cover 34 of the valve, the left body, the middle body, the right body, and the right end cover 29 of the valve are connected by the screw 30, so as to realize the axial fixation of the whole valve;

[0083] A protrusion is provided on the right side of the valve right end cover 29 to ensure a gap between the valve right end cover 29 and the external right end cover 28 during the screwing process of the external right end cover 28 and the external cylinder 35 .

[0084] In order to further improve the overall axial positioning of the sliding piston 24, in this embodiment, a fixing piece is provided on the sliding piston 24, and the fixing piece is used to axially fix the magnetorheological piston; the fixing piece fixes the magnetorheological piston between the left end cover 8 of the piston and the right end cover 17 of the piston, and specifically, the fixing piece is a screw 30. The left end cover 8 of the piston is provided with a groove, and the screw 30 is installed here. The left body 11 of the piston, the middle body 12 of the piston, the right body 15 of the piston, and the right end cover 17 of the piston are all provided with threaded holes. The left end cover 8 of the piston, the left body 11 of the piston, the middle body 12 of the piston, the right body 15 of the piston, and the right end cover 17 of the piston are connected by the screw 30, so as to realize the overall axial positioning of the sliding piston 24.

[0085] The left end cover 5 of the shock absorber is connected to the outer cylinder 6 by threads; the right end cover 21 of the shock absorber is connected to the outer cylinder 6 by welding; the left lifting ear 1 is connected to the piston rod 2 by threads; an air filling port is provided on the right end cover 21 of the shock absorber, and air is filled into the shock absorber through the air filling port; the right lifting ear 23 is connected to the right end cover 21 of the shock absorber by welding; the piston rod 2 is connected to the piston by threads, and a shaft shoulder is provided on the piston rod 2, which is accurately connected by cooperating with the left end face of the piston; two through holes are provided on the wall of the cylinder, and an interface 25 is welded; a threaded hole is provided in the interface 25 for connecting with the guide pipe joint 26; a step is provided on the inner wall of the cylinder to limit the movement of the floating piston 19 and avoid affecting the flow of the magnetorheological fluid 18 at the position of the interface 25. Guide pipe joints 26 are provided on both sides of the guide pipe 27 to allow the magnetorheological fluid 18 to flow in the outer cylinder 6 and the external valve chamber;

[0086] A conical through hole is provided in the middle of the left valve body 33, and a ball 14 is provided in the through hole, which cooperates with the coil spring 13 to play the role of a one-way valve; a conical through hole is provided in the middle of the right valve body 31, and a ball 14 is provided in the through hole, which cooperates with the coil spring 13 to play the role of a one-way valve.

[0087] In this embodiment, the magnetorheological valve body is externalized by means of a bypass, which can not only facilitate the heat dissipation of the valve body, but also facilitate the introduction of wires into the interior of the valve body, and at the same time greatly simplifies the maintenance and replacement process of the valve body.

[0088] The magnetorheological valve body is composed of three parts and a three-level electromagnetic coil 10 structure. By passing corresponding currents through the electromagnetic coils 10 on the three magnetorheological valve bodies, the valve body is placed in different working modes.

[0089] The one-way valve disposed in the middle of the left valve body 33 and the right valve body 31 is used to change the flow path of the magnetorheological fluid 18 inside the valve body to achieve different damping force outputs.

[0090] Corresponding currents are passed through different coils to put the magnetorheological damper in different working modes, as shown below:

[0091] Mode 1: When the electromagnetic coils 10 of the valve left body 33 and the valve middle body 32 are 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.

[0092] Reference Fig.24 During the stretching stroke, the magnetorheological fluid 18 enters the magnetorheological device 45 from the middle flow channel and the circumferential channel of the left valve body 33. However, the magnetorheological fluid 18 entering the magnetorheological device 45 through the middle flow channel is not within the magnetic field range of the left valve body 33, so no magneto-induced damping force is generated.

[0093] Reference Fig.25 In the compression stroke, since the one-way valve of the left valve body 33 is in a closed state, the magnetorheological fluid 18 entering the magnetorheological device 45 can only flow out from the circumferential channel. Therefore, the magnetorheological fluid 18 entering the magnetorheological device 45 all flows through the magnetic field range of the left valve body 33 and the coil on the middle body, and outputs a larger damping force outward.

[0094] Mode 2: The electromagnetic coils 10 of the valve center body 32 and the valve right body 31 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.

[0095] Reference Fig.26 During the stretching stroke, the magnetorheological fluid 18 enters the magnetorheological device 45 from the middle flow channel and the circumferential channel of the valve. Since the one-way valve of the right body 31 of the valve is in a closed state, the magnetorheological fluid 18 entering the magnetorheological device 45 can only flow out from the circumferential channel. Therefore, the magnetorheological fluid 18 entering the magnetorheological device 45 all flows through the magnetic field range of the valve middle body 32 and the coil on the right body, and outputs a larger damping force outward.

[0096] Reference Fig. 27 During the compression stroke, the magnetorheological fluid 18 enters the magnetorheological device 45 from the middle flow channel and the circumferential channel of the valve right body 31. However, the magnetorheological fluid 18 entering the magnetorheological device 45 through the middle flow channel is not within the magnetic field range of the valve right body 31, so no magneto-induced damping force is generated.

[0097] Mode three: the electromagnetic coils 10 of the left valve body 33 and the right valve body 31 are energized. At this time, under the same current input, the damper outputs equal damping forces in the extension and compression strokes.

[0098] Reference Fig.28 During the stretching stroke, the magnetorheological fluid 18 enters the magnetorheological device 45 from the middle flow channel and the circumferential channel of the left valve body 33. However, the magnetorheological fluid 18 entering the magnetorheological device 45 through the middle flow channel is not within the magnetic field range of the left valve body 33, so no magneto-induced damping force is generated.

[0099] Reference Fig.29 During the compression stroke, the magnetorheological fluid 18 enters the magnetorheological device 45 from the middle flow channel and the circumferential channel of the valve right body 31. However, the magnetorheological fluid 18 entering the magnetorheological device 45 through the middle flow channel is not within the magnetic field range of the valve right body 31, so no magneto-induced damping force is generated.

[0100] Mode 4: Only the electromagnetic coil 10 of the valve body 32 is energized

[0101] Reference Fig.30 , Fig.31 The valve body 32 generates a larger damping force, and outputs symmetrical damping force under the same current input during the extension and compression strokes.

[0102] Mode 5: All electromagnetic coils 10 of the left valve body 33, the middle valve body 32 and the right valve body 31 are energized

[0103] Reference Fig.32 During the stretching stroke, the magnetorheological fluid 18 enters the magnetorheological device 45 from the middle channel and the circumferential channel of the left valve body 33 .

[0104] Reference Fig.33 In the compression stroke, the magnetorheological fluid 18 enters the magnetorheological device 45 from the middle channel and the circumferential channel of the right valve body 31 .

[0105] In the extension and compression strokes, symmetrical damping force is output under the same current input.

[0106] Among them, mode three, mode four, and mode five all output the same damping force in the extension and compression strokes, among which mode four has the smallest damping force output, and mode five has the largest damping force output.

[0107] The above are all preferred embodiments of the present utility model, and are not intended to limit the protection scope of the present utility model. Therefore, any equivalent changes made based on the structure, shape, and principle of the present utility model should be included in the protection scope of the present utility model.

Claims

1. A multi-coil multi-working mode magnetorheological damper with flow mode, characterized in that: include: Cylinder body; A piston assembly, the piston assembly comprising a piston rod and a sliding piston disposed on the piston rod, the sliding piston being drivably slidably disposed in a cylinder body; A magnetorheological device, the magnetorheological device comprising a magnetorheological valve body, at least one magnetorheological valve left body is arranged on the left side of the magnetorheological valve body, at least one magnetorheological valve right body is arranged on the right side of the magnetorheological valve body, and electromagnetic coils are correspondingly arranged on the magnetorheological device, and the damping force output is changed by passing corresponding currents through the electromagnetic coils on different magnetorheological devices; The cylinder body forms a damping channel 1 and a damping channel 2 for the magnetorheological fluid to flow on the left and right sides of the sliding piston, respectively. The magnetorheological device is provided with a damping channel 3 for the magnetorheological fluid to flow. The magnetorheological device is provided with an intermediate channel for three-way communication with the damping channel, and the intermediate channels on the left and right magnetorheological valve bodies are both provided with one-way valves; A floating piston is provided in the cylinder body and on a side away from the piston rod in a sliding manner, and the left side of the floating piston is a damping channel 2.

2. The multi-coil multi-working mode magnetorheological damper with flow mode according to claim 1, characterized in that: The one-way valve includes a ball and an elastic member, the middle 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 preload force to the ball in the direction of 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, and when the sliding piston is stretched and compressed, the ball is placed in different positions of the tapered through hole under the action of the liquid pressure and the preload force of the spring, thereby opening or closing the middle channel.

3. The multi-coil multi-working mode magnetorheological damper with flow mode according to claim 1 or 2, characterized in that: A gas passage is formed between the right side of the floating piston and the cylinder body, and a vent connected to the gas passage is arranged on the cylinder body.

4. The multi-coil multi-working mode magnetorheological damper with flow mode according to claim 3, characterized in that: The magnetorheological device is arranged in a sliding piston, and the sliding piston includes a piston sleeve, a piston left end cover arranged on the left side of the piston sleeve, and a piston right end cover arranged on the right side of the piston sleeve. Damping channels four are arranged on the piston left end cover and the piston right end cover. The magnetorheological device is a magnetorheological piston, and the magnetorheological piston is arranged between the piston left end cover, the piston sleeve and the piston right end cover. Damping channels three are formed between the magnetorheological piston and the piston left end cover, the piston sleeve and the piston right end cover, and between adjacent magnetorheological pistons.

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

6. The multi-coil multi-working mode magnetorheological damper with flow mode according to claim 4, characterized in that: The cylinder body comprises an outer cylinder, a left end cover of the shock absorber arranged on the left side of the outer cylinder and a right end cover of the shock absorber arranged on the right side of the outer cylinder, a right lifting ear is arranged on the right side of the right end cover of the shock absorber, and a left lifting ear is arranged on the piston rod.

7. The multi-coil multi-working mode magnetorheological damper with flow mode according to claim 4, characterized in that: The cylinder body comprises an inner cylinder and an outer cylinder coaxially arranged outside the inner cylinder. The sliding piston and the floating piston are both slidably arranged in the inner cylinder. The outer cylinder is connected to the inner cylinder to form a gas channel.

8. The multi-coil multi-working mode magnetorheological damper with flow mode according to claim 6 or 7, characterized in that: An elastic baffle is arranged between the right body of the magnetorheological valve and the right end cover of the piston.

9. The multi-coil multi-working mode magnetorheological damper with flow mode according to claim 3, characterized in that: It also includes a magnetorheological valve body, the two sides of which are respectively arranged on the outside of the cylinder body through a guide tube 1 and a guide tube 2, the magnetorheological device is arranged in the magnetorheological valve body, and a damping channel 3 is provided between the magnetorheological valve body and the magnetorheological device and between two adjacent magnetorheological devices; the damping channel 3 of the magnetorheological valve body located on the left side is communicated with the damping channel 1 through the guide tube 1, and the damping channel 3 of the magnetorheological valve body located on the right side is communicated with the damping channel 2 through the guide tube 2.

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

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