Magnetorheological fluid damper

Abstract

The magnetorheological fluid damper comprises an inner cylinder barrel and an inflation connecting rod, a sliding piston assembly, an electromagnetic coil assembly, a magnetorheological fluid anti-sedimentation assembly and a floating piston assembly are sequentially arranged in the inner cylinder barrel, and a cavity B is formed between the electromagnetic coil assembly and the magnetorheological fluid anti-sedimentation assembly; a cavity C is formed between the magnetorheological fluid anti-settling assembly and the floating piston assembly, the magnetorheological fluid anti-settling assembly is provided with a third channel, and the two ends of the third channel communicate with the cavity B and the cavity C correspondingly; a high-pressure air cavity is formed between the floating piston assembly and the bottom valve, and one end of the inflation connecting rod penetrates through the sliding piston assembly and then is connected with the electromagnetic coil assembly. According to the device, the magnetorheological fluid flows between the cavity B and the cavity C through rapid movement of the inflation connecting rod, the magnetorheological fluid can form impact liquid flow, and a stirring effect is exerted on the settled magnetorheological fluid in the cavity C, so that settled particles are stirred, the mixing concentration of the magnetorheological fluid tends to be uniform, and the magnetorheological fluid rapidly returns to the normal state.

Description

Technical Field

[0001] The invention belongs to the technical field of dampers, and in particular relates to a magnetorheological fluid damper. Background Art

[0002] With people's increasing requirements for vehicle handling and comfort, as well as the rapid development of new energy technologies, various intelligent suspensions have been developed, among which magnetorheological fluid dampers are favored by users for their superior handling and comfort. Magnetorheological dampers are a new type of actuator with adjustable damping force. Its working fluid is magnetorheological fluid. When the piston and cylinder body move relative to each other, the magnetorheological fluid will be squeezed and passed through the damping channel on the piston, so that the magnetorheological fluid will generate shear force. At the same time, the rheological properties of magnetorheological fluid can be changed under the action of a magnetic field. Under the action of an external magnetic field, reversible transformation between Newtonian fluid and Bingham fluid can be achieved within milliseconds. Therefore, magnetorheological fluid dampers have the characteristics of fast response speed and a large damping force adjustment range.

[0003] Since magnetorheological fluid contains metal particles, the density of metal particles in magnetorheological fluid is greater than that of oil, and metal particles are prone to sedimentation. As time goes by, more and more metal particles settle, resulting in the shear force of the magnetorheological fluid becoming smaller and smaller, causing the damping force of the magnetorheological fluid damper to become smaller and smaller, which in turn affects the vehicle's handling and comfort. At present, there is no effective technical solution to solve this problem. Summary of the invention

[0004] The purpose of the present invention is to provide a magnetorheological fluid damper to solve the above problems existing in the prior art.

[0005] In order to achieve the above-mentioned purpose, the present invention adopts the following technical scheme: a magnetorheological fluid damper, comprising an inner cylinder and an inflatable connecting rod, wherein the two ends of the inner cylinder are respectively provided with a guide and a bottom valve, wherein a sliding piston assembly, an electromagnetic coil assembly, a magnetorheological fluid anti-settling assembly and a floating piston assembly are sequentially provided inside the inner cylinder, wherein a cavity A is provided between the sliding piston assembly and the guide, and the sliding piston assembly is provided with a first channel connected to the cavity A; a cavity B is provided between the electromagnetic coil assembly and the magnetorheological fluid anti-settling assembly, and the electromagnetic coil assembly is provided with a second channel, and the two ends of the second channel are respectively connected to the first channel and the cavity B; a cavity C is provided between the magnetorheological fluid anti-settling assembly and the floating piston assembly, and the magnetorheological fluid anti-settling assembly is provided with a third channel, and the two ends of the third channel are respectively connected to the cavity B and the cavity C; a high-pressure gas cavity is provided between the floating piston assembly and the bottom valve; the inflatable connecting rod is slidably matched with the guide, and one end of the inflatable connecting rod is connected to the electromagnetic coil assembly after passing through the sliding piston assembly.

[0006] As an optional implementation of the above technical solution, the magnetorheological fluid anti-sedimentation assembly includes a fixed mounting disk and a plurality of magnetorheological fluid conduits, the fixed mounting disk is fixed to the inner wall of the inner cylinder, a plurality of mounting holes are opened on the fixed mounting disk, the magnetorheological fluid conduit is installed in at least one mounting hole, the magnetorheological fluid conduit extends into the C cavity, the third channel is arranged in the magnetorheological fluid conduit, or the third channel is arranged in the mounting hole where the magnetorheological fluid conduit is not installed.

[0007] As an optional implementation of the above technical solution, a mounting groove is provided on the circumferential side of the fixed mounting plate, and a mounting protrusion adapted to the mounting groove is provided on the inner wall of the inner cylinder.

[0008] As an optional implementation of the above technical solution, the sliding piston assembly includes a sliding piston body, a first guide sealing ring, a second guide sealing ring and a guide slip ring. The middle part of the sliding piston body is provided with a first assembly hole adapted to the inflation connecting rod, and a plurality of first channels are arranged on the circumferential side of the first assembly hole; the guide slip ring is sleeved on the outer side of the sliding piston body and is in sliding contact with the inner wall of the inner cylinder, and the first guide sealing ring and the second guide sealing ring are respectively arranged on both sides of the guide slip ring to prevent the guide slip ring from contacting the magnetorheological fluid.

[0009] As an optional implementation of the above technical solution, a first groove and a second groove are provided on the surface of the sliding piston body, the first guide sealing ring is installed in the first groove, the second guide sealing ring is installed in the second groove, and the first guide sealing ring and the second guide sealing ring are both protruding from the surface of the sliding piston body.

[0010] As an optional implementation of the above technical solution, the electromagnetic coil assembly includes a coil seat, an electromagnetic coil and a gap adjustment block, a second assembly hole adapted to the inflation connecting rod is provided in the middle of the coil seat, an annular groove is provided on the circumferential side of the second assembly hole, the inner wall of the annular groove is provided with a flow hole extending to the surface of the coil seat, the gap adjustment block is arranged in the annular groove, and a first flow channel is provided between the gap adjustment block and the annular groove, and the two ends of the first flow channel are respectively connected to the first channel and the flow hole; the outer wall of the coil seat is provided with a coil groove adapted to the electromagnetic coil, and the outer side of the electromagnetic coil is provided with a sealing resin.

[0011] As an optional implementation of the above technical solution, a second flow channel is provided between the outer wall of the coil seat and the inner wall of the inner cylinder, and the second flow channel is communicated with the first channel.

[0012] As an optional implementation of the above technical solution, a gasket is provided between the coil seat and the sliding piston body, an annular flow channel is provided between the gasket and the inner wall of the inner cylinder, and the first channel is connected to the first flow channel and the second flow channel respectively through the annular flow channel.

[0013] As an optional implementation of the above technical solution, the floating piston assembly includes a floating piston body, a third guide sealing ring and a fourth guide sealing ring. The surface of the floating piston body is provided with a third groove and a fourth groove. The third guide sealing ring is installed in the third groove, and the fourth guide sealing ring is installed in the fourth groove. The third guide sealing ring and the fourth guide sealing ring are both protruding from the surface of the floating piston body.

[0014] As an optional implementation of the above technical solution, it also includes an outer cylinder, which is sleeved on the outside of the inner cylinder, an oil seal is provided between one end of the outer cylinder and the inflation connecting rod, a base is provided at the other end of the outer cylinder, and a D cavity is provided between the outer cylinder and the inner cylinder, one end of the D cavity is sealed by a guide, and the other end of the D cavity is connected to the high-pressure air cavity through a bottom valve.

[0015] As an optional implementation of the above technical solution, the guide includes a guide body, a self-sealing rubber ring, a bushing, a fifth guide sealing ring and an oil sealing ring. A central through hole is provided on the guide body, and a bushing and a fifth guide sealing ring are provided on the inner wall of the central through hole. The oil sealing ring is arranged between the guide body and the inner cylinder; the guide body is provided with an inflation channel, and an E cavity connected to the central through hole is provided on the inner side of the inflation channel, and the self-sealing rubber ring is arranged between the outer side of the inflation channel and the D cavity. An inflation port is provided on the inflation connecting rod, and the high-pressure gas inside the inflation connecting rod can push open the self-sealing rubber ring after passing through the inflation port, the E cavity and the inflation channel, and the D cavity is filled with high-pressure gas. When the high-pressure gas inside the inflation connecting rod stops being injected, the high-pressure gas in the D cavity can drive the self-sealing rubber ring to close the inflation channel.

[0016] The beneficial effects of the present invention are:

[0017] The present invention arranges a magnetorheological fluid anti-sedimentation assembly between the electromagnetic coil assembly and the floating piston assembly, and arranges a third channel connecting the B cavity and the C cavity on the magnetorheological fluid anti-sedimentation assembly. The magnetorheological fluid is made to flow between the B cavity and the C cavity by rapidly moving the inflatable connecting rod. The magnetorheological fluid can form an impact liquid flow, exerting a stirring effect on the magnetorheological fluid that has settled in the C cavity, thereby stirring the settled particles, making the mixed concentration of the magnetorheological fluid approach to uniformity, and the magnetorheological fluid quickly returns to a normal state. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 is a schematic structural diagram of a magnetorheological fluid damper in one embodiment of the present invention;

[0019] Figure 2 It is a schematic structural diagram of a sliding piston assembly, an electromagnetic coil assembly and an air charging connecting rod in one embodiment of the present invention;

[0020] Figure 3 is a schematic structural diagram of a sliding piston assembly in one embodiment of the present invention;

[0021] Figure 4 is a schematic structural diagram of an electromagnetic coil assembly in one embodiment of the present invention;

[0022] Figure 5 is a schematic structural diagram of a coil holder in one embodiment of the present invention;

[0023] Figure 6 is a top view of an electromagnetic coil assembly in one embodiment of the present invention;

[0024] Figure 7 is a schematic structural diagram of a guide in one embodiment of the present invention;

[0025] Figure 8 is a schematic structural diagram of a floating piston assembly in one embodiment of the present invention;

[0026] Fig. 9 is a schematic structural diagram of a magnetorheological fluid anti-settling assembly in one embodiment of the present invention;

[0027] Fig.10 It is a coordinate diagram of the vehicle body tilt angle and the required damping force in one embodiment of the present invention.

[0028] In the figure: 1-inflatable connecting rod; 2-oil seal; 3-guide; 4-outer cylinder; 5-inner cylinder; 6-conductor; 7-sliding piston assembly; 8-washer; 9-clearance adjustment block; 10-magnetorheological fluid anti-settling assembly; 11-floating piston assembly; 12-bottom valve; 13-electromagnetic coil assembly; 14-base; 15-A cavity; 16-B cavity; 17-C cavity; 18-D cavity; 19-E cavity; 20-high-pressure gas cavity;

[0029] 101- inflation port;

[0030] 301-guide body; 302-self-sealing rubber ring; 303-bushing; 304-fifth guide sealing ring; 306-oil sealing ring; 307-inflating channel;

[0031] 701-sliding piston body; 702-first guide sealing ring; 703-second guide sealing ring; 704-guide sliding ring;

[0032] 1001-fixed mounting plate; 1002-magnetorheological fluid conduit;

[0033] 1101- floating piston body; 1102- third guide seal ring; 1103- fourth guide seal ring;

[0034] 1301 - coil seat; 1302 - electromagnetic coil; 1303 - sealing resin. DETAILED DESCRIPTION

[0035] The outer ring of the piston (ring) of the existing magnetorheological fluid damper is clearance-fitted with the inner diameter of the damper inner cylinder. Since the magnetorheological fluid contains metal particles, the magnetorheological fluid containing the particles fills the space between the outer ring of the piston (ring) and the inner wall of the damper inner cylinder, forming mechanical grinding, resulting in rapid wear between the piston (ring) and the inner wall of the inner cylinder, thereby increasing internal leakage and abnormal noise, and greatly shortening the life and performance of the magnetorheological fluid damper. In addition, since the magnetorheological fluid contains metal particles, the density of metal particles in the magnetorheological fluid is greater than that of oil, and metal particles are prone to sedimentation. As time goes by, more and more metal particles settle, resulting in the shear force of the magnetorheological fluid becoming smaller and smaller, causing the damping force of the magnetorheological fluid damper to become smaller and smaller, thereby affecting the vehicle's handling and comfort. There is currently no effective technical solution to solve this problem; currently, magnetorheological fluid dampers generally use high-pressure nitrogen to be filled first, then magnetorheological fluid to be filled, and finally packaged into a finished shock absorber. Therefore, magnetorheological fluid shock absorbers are difficult to assemble, which affects the large-scale application of this technology and has certain risks; in addition, the valve system of the current magnetorheological fluid damper is a single flow channel, and the structure is also complex, large in size, and has high energy consumption and other defects.

[0036] Based on the above problems, Figure 1-Figure 9 As shown, this embodiment provides a magnetorheological fluid damper, including an inner cylinder 5 and an inflatable connecting rod 1, wherein the two ends of the inner cylinder 5 are respectively provided with a guide 3 and a bottom valve 12, and the inner cylinder 5 is provided with a sliding piston assembly 7, an electromagnetic coil assembly 13, a magnetorheological fluid anti-sedimentation assembly 10 and a floating piston assembly 11 in sequence, and the sliding piston assembly 7, the electromagnetic coil assembly 13 and the floating piston assembly 11 are all movably arranged inside the inner cylinder 5, and the magnetorheological fluid anti-sedimentation assembly 10 is fixed inside the inner cylinder 5.

[0037] A cavity 15 is provided between the sliding piston assembly 7 and the guide 3, and the sliding piston assembly 7 is provided with a first channel connected to the A cavity 15; a B cavity 16 is provided between the electromagnetic coil assembly 13 and the magnetorheological fluid anti-sedimentation assembly 10, and the electromagnetic coil assembly 13 is provided with a second channel, and the two ends of the second channel are respectively connected to the first channel and the B cavity 16; a C cavity 17 is provided between the magnetorheological fluid anti-sedimentation assembly 10 and the floating piston assembly 11, and the magnetorheological fluid anti-sedimentation assembly 10 is provided with a third channel, and the two ends of the third channel are respectively connected to the B cavity 16 and the C cavity 17, and a high-pressure gas cavity 20 is provided between the floating piston assembly 11 and the bottom valve 12. The A cavity 15, the B cavity 16 and the C cavity 17 are all filled with magnetorheological fluid, and the high-pressure gas cavity 20 is filled with nitrogen. The inflation connecting rod 1 is slidably matched with the guide 3, and one end of the inflation connecting rod 1 passes through the sliding piston assembly 7 and is connected to the electromagnetic coil assembly 13. The inflatable connecting rod 1 can move with the piston assembly and the electromagnetic coil assembly 13, and the electromagnetic coil assembly 13 can change the viscosity of the magnetorheological fluid in the second channel, thereby changing the damping force of the damper.

[0038] The magnetorheological fluid damper also includes an outer cylinder, which is sleeved on the outside of the inner cylinder 5, an oil seal 2 is provided between one end of the outer cylinder and the inflation connecting rod 1, and a base 14 is provided at the other end of the outer cylinder. A D cavity 18 is provided between the outer cylinder and the inner cylinder 5, one end of the D cavity 18 is sealed by a guide 3, and the other end of the D cavity 18 is connected to the high-pressure air cavity 20 through a bottom valve 12.

[0039] The present invention arranges a magnetorheological fluid anti-sedimentation assembly 10 between the electromagnetic coil assembly 13 and the floating piston assembly 11, and arranges a third channel connecting the B cavity 16 and the C cavity 17 on the magnetorheological fluid anti-sedimentation assembly 10. The inflatable connecting rod 1 is moved quickly to make the magnetorheological fluid flow between the B cavity 16 and the C cavity 17. The magnetorheological fluid can form an impact liquid flow, exerting a stirring effect on the magnetorheological fluid that has settled in the C cavity 17, so that the settled particles are stirred, the mixed concentration of the magnetorheological fluid is close to uniform, and the magnetorheological fluid quickly returns to a normal state.

[0040] Specifically, the magnetorheological fluid anti-settling assembly 10 includes a fixed mounting plate 1001 and a plurality of magnetorheological fluid conduits 1002. The fixed mounting plate 1001 is fixed to the inner wall of the inner cylinder 5. The fixed mounting plate 1001 is provided with a plurality of mounting holes. The magnetorheological fluid conduit 1002 is installed in at least one mounting hole. The magnetorheological fluid conduit 1002 extends into the C cavity 17. The third channel is provided in the magnetorheological fluid conduit 1002, or the third channel is provided in the mounting hole where the magnetorheological fluid conduit 1002 is not installed. The fixed mounting plate 1001 is provided with a mounting groove on its circumferential side, and the inner wall of the inner cylinder 5 is provided with a mounting protrusion adapted to the mounting groove.

[0041] The sliding piston assembly 7 includes a sliding piston body 701, a first guide seal ring 702, a second guide seal ring 703 and a guide slip ring 704. The first guide seal ring 702 adopts a first Gly ring, and the second guide seal ring 703 adopts a second Gly ring. A first assembly hole adapted to the inflatable connecting rod 1 is provided in the middle of the sliding piston body 701, and a plurality of the first channels are provided around the first assembly hole; the guide slip ring 704 is sleeved on the outer side of the sliding piston body 701 and is in sliding contact with the inner wall of the inner cylinder 5, and the first guide seal ring 702 and the second guide seal ring 703 are respectively provided on both sides of the guide slip ring 704 to prevent the guide slip ring 704 from contacting with the magnetorheological fluid. A first groove and a second groove are provided on the surface of the sliding piston body 701, the first guide seal ring 702 is installed in the first groove, and the second guide seal ring 703 is installed in the second groove, and the first guide seal ring 702 and the second guide seal ring 703 are both protruding from the surface of the sliding piston body 701.

[0042] The electromagnetic coil assembly 13 includes a coil seat 1301, an electromagnetic coil 1302 and a gap adjustment block 9. The middle part of the coil seat 1301 is provided with a second assembly hole adapted to the inflatable connecting rod 1. The circumferential side of the second assembly hole is provided with an annular groove. The inner wall of the annular groove is provided with a flow hole extending to the surface of the coil seat 1301. The gap adjustment block 9 is arranged in the annular groove, and a first flow channel is provided between the gap adjustment block 9 and the annular groove. The two ends of the first flow channel are respectively connected to the first channel and the flow hole; the outer wall of the coil seat 1301 is provided with a coil groove adapted to the electromagnetic coil 1302, and the outer side of the electromagnetic coil 1302 is provided with a sealing resin 1303. A second flow channel is provided between the outer wall of the coil seat 1301 and the inner wall of the inner cylinder 5, and the second flow channel is connected to the first channel. A gasket 8 is provided between the coil seat 1301 and the sliding piston body 701 , and an annular flow channel is provided between the gasket 8 and the inner wall of the inner cylinder 5 , and the first channel is connected to the first flow channel and the second flow channel respectively through the annular flow channel.

[0043] The floating piston assembly 11 includes a floating piston body 1101, a third guide seal ring 1102 and a fourth guide seal ring 1103. The surface of the floating piston body 1101 is provided with a third clamping groove and a fourth clamping groove. The third guide seal ring 1102 is installed in the third clamping groove, and the fourth guide seal ring 1103 is installed in the fourth clamping groove. The third guide seal ring 1102 and the fourth guide seal ring 1103 are both raised on the surface of the floating piston body 1101. The third guide seal ring 1102 adopts a third Gly ring, and the fourth guide seal ring 1103 adopts a fourth Gly ring.

[0044] The guide 3 includes a guide body 301, a self-sealing rubber ring 302, a bushing 303, a fifth guide sealing ring 304 and an oil sealing ring 306. The guide body 301 is provided with a central through hole, the inner wall of the central through hole is provided with a bushing 303 and a fifth guide sealing ring 304, the fifth guide sealing ring 304 adopts a fifth Gray ring, and the oil sealing ring 306 is arranged between the guide body 301 and the inner cylinder 5; the guide body 301 is provided with an air charging channel 307, and the inner side of the air charging channel 307 is provided with a There is an E cavity 19 connected to the central through hole, and the self-sealing rubber ring 302 is arranged between the outer side of the inflation channel 307 and the D cavity 18. The inflation connecting rod 1 is provided with an inflation port 101. The high-pressure gas inside the inflation connecting rod 1 can push open the self-sealing rubber ring 302 after passing through the inflation port 101, the E cavity 19 and the inflation channel 307, and the D cavity 18 is filled with high-pressure gas. When the high-pressure gas inside the inflation connecting rod 1 stops being injected, the high-pressure gas in the D cavity 18 can drive the self-sealing rubber ring 302 to close the inflation channel 307.

[0045] In the present invention, in order to solve the defects of magnetorheological fluid damper such as large wear, short life and abnormal noise, the present invention develops a new type of sliding piston assembly 7, which realizes the separation of the inner sealing and piston guiding functions of the sliding piston assembly 7. Specifically, the sliding piston assembly 7 includes a sliding piston body 701, a first guide sealing ring 702, a second guide sealing ring 703 and a guide sliding ring 704. The guide sliding ring 704 is installed in the middle of the outer ring of the sliding piston body 701. When the sliding piston assembly 7 and the inflation connecting rod 1 reciprocate along the inner wall of the inner cylinder 5, the guide sliding ring 704 plays a guiding role; two U-shaped grooves are processed at both ends of the sliding piston body 701, which are the first clamping groove and the second clamping groove respectively. The first clamping groove and the second clamping groove are used to install the first guide sealing ring 7 respectively. 02 and the second guide sealing ring 703, and the first guide sealing ring 702 and the second guide sealing ring 703 are tightly fitted with the inner wall of the inner cylinder 5, which are used to prevent the magnetorheological fluid from entering the space formed by the first guide sealing ring 702, the second guide sealing ring 703, the outer wall of the sliding piston body 701 and the inner wall of the inner cylinder 5, thereby protecting the guide sliding ring 704 from the wear of the magnetorheological fluid, thereby extending the life of the magnetorheological fluid damper; when assembling the sliding piston assembly 7, lubricating grease for reducing friction can be added to the space.

[0046] The magnetorheological fluid anti-settling assembly 10 is mainly composed of a circular fixed mounting plate 1001 and a plurality of magnetorheological fluid conduits 1002. A plurality of mounting holes are processed on the fixed mounting plate 1001, and the magnetorheological fluid conduits 1002 are installed in some or all of the mounting holes. The magnetorheological fluid anti-settling assembly 10 is fixed at a certain position between the electromagnetic coil assembly 13 and the floating piston assembly 11. The fixing method can be a method of squeezing a groove on the inner wall of the inner cylinder 5, or other structural forms. Since the magnetorheological fluid anti-settling assembly 10 has a B cavity 16 and a C cavity 17 on both sides,

[0047] When the inflation connecting rod 1 and the sliding piston assembly 7 move downward along the inner wall of the inner cylinder 5, the volume of the B chamber 16 inside the inner cylinder 5 is occupied due to the invasion of the inflation connecting rod 1, so that a part of the magnetorheological fluid in the B chamber 16 flows to the A chamber 15 through the second channel and the first channel, and another part of the magnetorheological fluid in the B chamber 16 flows to the C chamber 17 through the third channel; because the inflation connecting rod 1, the sliding piston assembly 7 and the electromagnetic coil assembly 13 usually move downward at a faster speed, and because the inner diameter of the magnetorheological fluid conduit 1002 is small, the magnetorheological fluid forms an impact liquid flow at the outlet of the magnetorheological fluid conduit 1002, exerting a stirring effect on the settled magnetorheological fluid in the C chamber 17, so that the settled particles in the C chamber 17 are stirred, and the mixed concentration of the magnetorheological fluid in the C chamber 17 is close to uniform. When the inflatable connecting rod 1, the sliding piston assembly 7 and the electromagnetic coil assembly 13 move upward, the volume of the A chamber 15 decreases. Due to the high-pressure gas in the high-pressure gas chamber 20 at the bottom of the floating piston assembly 11, the magnetorheological fluid in the C chamber 17 flows to the B chamber 16 through the magnetorheological fluid conduit 1002. Since the magnetorheological fluid conduit 1002 on the anti-magnetorheological fluid sedimentation assembly is close to the upper part of the floating piston assembly 11, the magnetorheological fluid close to the upper part of the floating piston assembly 11 is first pressed into the upper part of the magnetorheological fluid anti-sedimentation assembly 10, and then the settled particles in the C chamber 17 are stirred, so that the oil-liquid mixed concentration in the C chamber 17 approaches uniformity. The magnetorheological fluid anti-sedimentation assembly 10 and the inner cylinder 5 are connected in a fixed position. The fixing method of the extrusion groove is listed in this case, and other connection fixing methods are not limited.

[0048] In order to increase the adjustment range of the damping force of the shock absorber, reduce the energy consumption of the magnetorheological fluid damper, and also to reduce the types of parts, the present invention designs a new electromagnetic coil assembly 13, which includes a coil seat 1301 ( Figure 5 and Figure 6), electromagnetic coil 1302, gap adjustment block 9, sealing resin 1303 and wire 6. The outer ring of coil seat 1301 is processed with one or more coil grooves, and the coil grooves are used to install electromagnetic coil 1302; the outer ring of coil seat 1301 is cylindrical, one section of the inner part is a through hole, forming a second assembly hole, and the other section is a step, forming an annular groove, and the second assembly hole is a threaded hole, which is used to connect the thread at the lower end of the inflatable connecting rod 1. A first flow channel is provided between the gap adjustment block 9 and the annular groove for passing magnetorheological fluid. A groove is provided at the end of coil seat 1301 for passing wire 6 connected to electromagnetic coil 1302. One end of wire 6 away from electromagnetic coil 1302 passes through the inside of inflatable connecting rod 1 to the outside of inner cylinder 5. The coil groove, electromagnetic coil 1302 and groove are injected with thermoplastic resin to isolate the electromagnetic coil 1302 from contact with magnetorheological fluid, and also ensure that magnetorheological fluid will not leak into the inside of inflatable connecting rod 1 through electromagnetic coil assembly 13. A gasket 8 is provided between the coil seat 1301 and the sliding piston body 701 , and an annular flow channel is provided between the gasket 8 and the inner wall of the inner cylinder 5 , and the first channel is connected to the first flow channel and the second flow channel respectively through the annular flow channel.

[0049] The electromagnetic coil assembly 13 has two flow channels, both of which can be used as the second channel for the flow of magnetorheological fluid. The first flow channel includes the second flow channel, which is formed by a fixed gap formed between the coil seat 1301 and the inner wall of the inner cylinder 5. The second flow channel includes the first flow channel and the flow hole. The aperture of the annular groove is fixed to D. By changing the outer diameter d of the gap adjustment block 9, the damping force of the magnetorheological fluid damper can be adjusted to reduce the types of parts to be developed. Since the second flow channel passes through the inner side of the electromagnetic coil 1302, the magnetic field inside the electromagnetic coil 1302 is much larger than the magnetic field outside the electromagnetic coil 1302 after power is turned on. When the same damping force is generated, the excitation current of the electromagnetic coil 1302 can be reduced to reduce energy consumption. When the sliding piston assembly 7, the electromagnetic coil assembly 13 and the inflation connecting rod 1 move up and down along the inner wall of the inner cylinder 5, the magnetorheological fluid in the B chamber 16 and the magnetorheological fluid in the C chamber 17 flow back and forth through the first flow channel and the second flow channel. When the current in the electromagnetic coil 1302 is changed, the moving speed and force value of the inflation connecting rod 1 in the inner cylinder 5 can be adjusted, thereby changing the damping force of the magnetorheological fluid damper.

[0050] The guide 3 cooperates with the inflation connecting rod 1 with the inflation port 101. When inflation is implemented, the difficulty of inflating the shock absorber assembly can be reduced, and it can also ensure that when the lip of the oil seal 2 is worn, the D chamber 18 and the high-pressure gas chamber 20 can still store high-pressure gas. The inflation connecting rod 1 with the inflation port 101, the inflation port 101 is located at the upper end of the inflation connecting rod 1 near the threaded connection, and the direction is along the radial direction of the inflation connecting rod 1, and is connected to the inside of the inflation connecting rod 1.

[0051] The guide 3 is mainly composed of a guide body 301, a self-sealing rubber ring 302, a bushing 303, a fifth guide sealing ring 304 and an oil sealing ring 306. The present invention adds one or more inflation channels 307 to the guide body 301, processes a U-shaped groove on the outside of the inflation channel 307, and the self-sealing rubber ring 302 is tightly fitted and installed in the U-shaped groove. In the inflation mode, the inflation connecting rod 1 is pressed in, so that the inflation port 101 of the inflation connecting rod 1 is connected with the E cavity 19, and then the high-pressure gas is connected from the outer end of the inflation connecting rod 1. The high-pressure gas moves along the inside of the inflation connecting rod 1, and then enters the inflation channel 307 through the inflation port 101 and the E cavity 19. After entering the inflation channel 307, the high-pressure gas can push open the self-sealing rubber ring 302, and the D cavity 18 and the high-pressure gas cavity 20 are filled with high-pressure gas. When the charging connecting rod 1 stops receiving high-pressure gas, the air pressure in the E chamber 19 also decreases, and the high-pressure gas in the D chamber 18 applies gas pressure to the self-sealing rubber ring 302, so that the self-sealing rubber ring 302 is tightly pressed in the U-shaped groove, thereby ensuring that the high-pressure gas does not leak and increasing the service life of the shock absorber, thereby realizing the function of filling the magnetorheological fluid damper with high-pressure gas after the packaging is completed.

[0052] In order to reduce the movement resistance of the floating piston assembly 11, provide responsiveness, and extend the service life, the present invention designs a floating piston assembly 11 with a self-guided double sealing structure. The floating piston assembly 11 is mainly composed of a floating piston body 1101, a third grid ring, and a fourth grid ring. The third grid ring and the fourth grid ring (a sealing structure with both guiding and sealing functions such as a step seal can also be used) are tightly matched and sealed with the inner wall of the inner cylinder 5; the use of the third grid ring and the fourth grid ring two-stage seal not only ensures the guiding requirements of the floating piston assembly 11 when moving up and down along the inner wall of the inner cylinder 5, but also increases the sealing effect, greatly increasing the service life of the magnetorheological fluid damper.

[0053] According to the high-performance magnetorheological fluid damper provided by the present invention, a corresponding control system can be designed to analyze the posture change of the vehicle body based on the measurement data of some sensors (such as height sensors, IMU, etc.), thereby changing the coil current of the high-performance magnetorheological fluid damper, thereby changing the damping force, and then preventing the change of the vehicle body posture, such as Fig.10 As shown in the figure (the horizontal axis represents the body tilt angle α, and the vertical axis represents the damping force F that needs to be generated), when the system monitors and analyzes that the upward tilt angle of the body is less than the preset angle a2 / a1, the system provides a smaller current to the magnetorheological fluid damper, so that the magnetorheological fluid damper generates a smaller damping force, thereby ensuring the comfort of the vehicle. Fig.10 The A line in the middle provides current; when the system monitors and analyzes that the upward tilt angle of the vehicle body is greater than the preset angle a2 / a1, the control system immediately provides a large current to the magnetorheological fluid damper, so that the magnetorheological fluid damper produces a large damping force, thereby ensuring the comfort and controllability of the vehicle. Fig.10 The B line provides current.

[0054] The present invention can effectively reduce the wear of the sliding piston assembly 7 in the magnetorheological fluid, solve the problem of the magnetorheological fluid settling in the upper space of the floating piston, reduce the difficulty of filling the magnetorheological fluid damper with gas, and adopt a new electromagnetic coil assembly 13 to reduce the structural complexity of the magnetorheological fluid damper and save energy.

[0055] In the description of the present invention, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, and may be fixedly connected, detachably connected, or integrated; may be mechanically connected or electrically connected; may be directly connected or indirectly connected through an intermediate medium, may be the internal connection of two elements or the interaction relationship between two elements. For those skilled in the art, the specific meanings of the above terms in the present invention can be understood. In addition, the specific features, structures, etc. described in the embodiments are included in at least one embodiment. Under the condition that there is no contradiction, those skilled in the art may combine the features of different embodiments. The protection scope of the present invention is not limited to the above-mentioned specific embodiments. According to the basic technical concept of the present invention, the embodiments that can be associated with by ordinary technicians in this field without creative work all belong to the protection scope of the present invention.

Claims

1. A magnetorheological fluid damper, characterized in that: The invention comprises an inner cylinder (5) and an air charging connecting rod (1), wherein two ends of the inner cylinder (5) are respectively provided with a guide (3) and a bottom valve (12), and the inner cylinder (5) is provided with a sliding piston assembly (7), an electromagnetic coil assembly (13), a magnetorheological fluid anti-settling assembly (10) and a floating piston assembly (11) in sequence, wherein an A cavity (15) is provided between the sliding piston assembly (7) and the guide (3), and the sliding piston assembly (7) is provided with a first channel communicating with the A cavity (15); a B cavity (16) is provided between the electromagnetic coil assembly (13) and the magnetorheological fluid anti-settling assembly (10), and the electromagnetic coil assembly (13) is provided with a first channel communicating with the A cavity (15); a B cavity (16) is provided between the electromagnetic coil assembly (13) and the magnetorheological fluid anti-settling assembly (10), and the electromagnetic coil assembly (13) is provided with a first channel communicating with the A cavity (15); a B cavity (16) is provided between the electromagnetic coil assembly (13) and the magnetorheological fluid anti-settling assembly (10), and the electromagnetic coil assembly (13) is provided with a first channel communicating with the A cavity (15). A second channel is provided, and the two ends of the second channel are respectively connected to the first channel and the B cavity (16); a C cavity (17) is provided between the magnetorheological fluid anti-sedimentation assembly (10) and the floating piston assembly (11), and the magnetorheological fluid anti-sedimentation assembly (10) is provided with a third channel, and the two ends of the third channel are respectively connected to the B cavity (16) and the C cavity (17); a high-pressure air cavity (20) is provided between the floating piston assembly (11) and the bottom valve (12); the inflation connecting rod (1) is slidably matched with the guide (3), and one end of the inflation connecting rod (1) passes through the sliding piston assembly (7) and is connected to the electromagnetic coil assembly (13).

2. The magnetorheological fluid damper according to claim 1, characterized in that: The magnetorheological fluid anti-sedimentation assembly (10) comprises a fixed mounting plate (1001) and a plurality of magnetorheological fluid conduits (1002); the fixed mounting plate (1001) is fixed to the inner wall of the inner cylinder (5); a plurality of mounting holes are provided on the fixed mounting plate (1001); the magnetorheological fluid conduit (1002) is installed in at least one mounting hole; the magnetorheological fluid conduit (1002) extends into the C cavity (17); the third channel is provided in the magnetorheological fluid conduit (1002), or the third channel is provided in a mounting hole where the magnetorheological fluid conduit (1002) is not installed.

3. The magnetorheological fluid damper according to claim 2, characterized in that: The fixed installation plate (1001) is provided with an installation groove on its circumferential side, and the inner wall of the inner cylinder (5) is provided with an installation protrusion adapted to the installation groove.

4. The magnetorheological fluid damper according to claim 1, characterized in that: The sliding piston assembly (7) comprises a sliding piston body (701), a first guide sealing ring (702), a second guide sealing ring (703) and a guide sliding ring (704); a first assembly hole adapted to the inflation connecting rod (1) is provided in the middle of the sliding piston body (701); a plurality of first channels are provided around the first assembly hole; the guide sliding ring (704) is sleeved on the outer side of the sliding piston body (701) and is in sliding contact with the inner wall of the inner cylinder (5); the first guide sealing ring (702) and the second guide sealing ring (703) are respectively provided on both sides of the guide sliding ring (704) to prevent the guide sliding ring (704) from contacting the magnetorheological fluid.

5. The magnetorheological fluid damper according to claim 4, characterized in that: The surface of the sliding piston body (701) is provided with a first groove and a second groove, the first guide sealing ring (702) is installed in the first groove, and the second guide sealing ring (703) is installed in the second groove, and both the first guide sealing ring (702) and the second guide sealing ring (703) are protruding from the surface of the sliding piston body (701).

6. The magnetorheological fluid damper according to claim 4, characterized in that: The electromagnetic coil assembly (13) comprises a coil seat (1301), an electromagnetic coil (1302) and a gap adjustment block (9); a second assembly hole adapted to the inflation connecting rod (1) is provided in the middle of the coil seat (1301); an annular groove is provided around the second assembly hole; the inner wall of the annular groove is provided with a flow hole extending to the surface of the coil seat (1301); the gap adjustment block (9) is arranged in the annular groove; a first flow channel is provided between the gap adjustment block (9) and the annular groove; the two ends of the first flow channel are respectively connected to the first channel and the flow hole; the outer wall of the coil seat (1301) is provided with a coil groove adapted to the electromagnetic coil (1302); the outer side of the electromagnetic coil (1302) is provided with a sealing resin (1303); a second flow channel is provided between the outer wall of the coil seat (1301) and the inner wall of the inner cylinder (5); the second flow channel is connected to the first channel.

7. The magnetorheological fluid damper according to claim 6, characterized in that: A gasket (8) is provided between the coil seat (1301) and the sliding piston body (701), an annular flow channel is provided between the gasket (8) and the inner wall of the inner cylinder (5), and the first channel is connected to the first flow channel and the second flow channel respectively through the annular flow channel.

8. The magnetorheological fluid damper according to claim 1, characterized in that: The floating piston assembly (11) comprises a floating piston body (1101), a third guide seal ring (1102) and a fourth guide seal ring (1103); a third groove and a fourth groove are provided on the surface of the floating piston body (1101); the third guide seal ring (1102) is installed in the third groove; the fourth guide seal ring (1103) is installed in the fourth groove; and both the third guide seal ring (1102) and the fourth guide seal ring (1103) are protruding from the surface of the floating piston body (1101).

9. The magnetorheological fluid damper according to claim 1, characterized in that: The invention also comprises an outer cylinder, which is sleeved on the outer side of the inner cylinder (5), an oil seal (2) is provided between one end of the outer cylinder and the inflation connecting rod (1), a base (14) is provided at the other end of the outer cylinder, a D cavity (18) is provided between the outer cylinder and the inner cylinder (5), one end of the D cavity (18) is sealed by a guide (3), and the other end of the D cavity (18) is connected to the high-pressure gas cavity (20) through a bottom valve (12).

10. The magnetorheological fluid damper according to claim 1, characterized in that: The guide (3) comprises a guide body (301), a self-sealing rubber ring (302), a bushing (303), a fifth guide sealing ring (304) and an oil sealing ring (306); a central through hole is provided on the guide body (301); the inner wall of the central through hole is provided with a bushing (303) and a fifth guide sealing ring (304); the oil sealing ring (306) is arranged between the guide body (301) and the inner cylinder (5); the guide body (301) is provided with an air charging channel (307); the inner side of the air charging channel (307) is provided with an E-type gasket communicating with the central through hole. The self-sealing rubber ring (302) is arranged between the outer side of the inflation channel (307) and the D cavity (18), and the inflation connecting rod (1) is provided with an inflation port (101). The high-pressure gas inside the inflation connecting rod (1) can pass through the inflation port (101), the E cavity (19) and the inflation channel (307) to push open the self-sealing rubber ring (302), and the D cavity (18) is filled with high-pressure gas. When the high-pressure gas inside the inflation connecting rod (1) stops being injected, the high-pressure gas in the D cavity (18) can drive the self-sealing rubber ring (302) to close the inflation channel (307).

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