An embedded shearing magnetorheological damper

Abstract

The purpose of the present invention is to provide an embedded shearing magnetorheological damper, comprising a working cylinder, a piston rod, a piston body, a magnetorheological fluid, a permanent magnet positioning ring, a permanent magnet ring I, a permanent magnet ring II, a permanent magnet ring III, and a coil. The present invention can solve the existing problems such as small damping force, while reducing the volume of magnetorheological fluid used for work, greatly improving the magnetorheological damping force, and has the advantages of small amount of magnetorheological fluid required and significant magnetorheological effect.

Description

Technical Field

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

[0002] Magnetorheological damper is a new type of damper that uses magnetorheological fluid, a controllable fluid. Under different magnetic fields, the shear yield strength of magnetorheological fluid is different, and the shear force that forces the magnetorheological fluid to flow is also different, which means that the damping force provided by the magnetorheological damper is variable. Therefore, by controlling the magnetic field generated by the external current, the purpose of adjusting the damping force of the magnetorheological damper can be achieved. It is precisely because of this important engineering application value of magnetorheological damper that the industry has now widely studied magnetorheological damper.

[0003] According to the flow mode of magnetorheological fluid, magnetorheological dampers can be divided into shear type, valve type, extrusion type and a mixed working mode of the two modes, among which the shear valve type magnetorheological damper is the most widely used. (Appendix: References CN221510346926, 221410425759.4), the patents in the references have the disadvantages of small damping force and low reliability, and the damping force needs to be further improved to meet the needs of actual working conditions.

[0004] Other prior art magnetorheological dampers also have various technical problems, such as low utilization rate of magnetorheological fluid, easy precipitation and clogging of magnetorheological fluid, fixed damping force adjustment range and inability to adjust flexibly, sometimes failure of the energized coil, and inability to ensure stable operation. Summary of the invention

[0005] The purpose of the present invention is to provide an embedded shear type magnetorheological damper, which can solve the existing problems such as small damping force, while reducing the volume of working magnetorheological fluid, greatly improving the magnetorheological damping force, and has the advantages of small amount of magnetorheological fluid required and significant magnetorheological effect.

[0006] The technical solution of the present invention is as follows:

[0007] The embedded shearing magnetorheological damper comprises a working cylinder, a piston rod, a piston body, a magnetorheological fluid, a permanent magnet positioning ring, a permanent magnet ring I, a permanent magnet ring II, a permanent magnet ring III, and a coil;

[0008] The two ends of the piston rod pass through the piston rod hole and pass through the left and right end surfaces of the working cylinder respectively, and can slide along the piston rod hole relative to the working cylinder; the piston body is arranged in the working cylinder, the piston body is fixedly connected to the middle part of the piston rod, and the axis of the piston body and the piston rod coincide;

[0009] The outer edges of the left and right end surfaces of the piston body are respectively provided with convex rings I, the outer cylindrical surface of the convex ring I is flush with the outer cylindrical surface of the piston body, and the outer cylindrical surface formed by the convex ring I and the piston body is provided with a coil ring groove, and a coil is provided in the coil ring groove;

[0010] A plurality of convex rings II are arranged at intervals on the left and right end surfaces of the piston body, and an annular groove I is formed between the convex rings I and II, and between each convex ring II; a permanent magnet ring I is mounted on the end surface of each convex ring II, and a convex ring III is mounted on the end surface of each permanent magnet ring I; the inner and outer circular surfaces of each convex ring II are flush with the permanent magnet ring I mounted thereon, and the inner and outer circular surfaces of the convex ring III mounted on the permanent magnet ring I;

[0011] The left and right inner walls of the working cylinder correspond to the left and right end surface structural design of the piston body. The left and right inner walls of the working cylinder are provided with convex rings IV corresponding to the annular grooves I at intervals. An annular groove II is formed between each convex ring IV. Each annular groove II corresponds to each convex ring II. Each convex ring IV is provided with a permanent magnet ring II. The end surface of each permanent magnet ring II is provided with a convex ring V. The inner and outer circular surfaces of each convex ring IV are respectively flush with the permanent magnet ring II provided thereon, and the inner and outer circular surfaces of the convex ring V provided on the permanent magnet ring II.

[0012] The convex portion I composed of the convex ring IV, the permanent magnet ring II, and the convex ring V extends into the corresponding annular groove I, and the convex portion II composed of the convex ring II, the permanent magnet ring I, and the convex ring III extends into the corresponding annular groove II; there are gaps between the inner and outer circular surfaces of the convex portion I and the inner and outer circular surfaces of the convex portion II that constitute the upper and lower side walls of the corresponding annular groove I;

[0013] A gap is left between the end surface of the convex ring V and the bottom wall of the corresponding annular groove I; a gap is left between the end surface of the convex ring III and the bottom wall of the corresponding annular groove II;

[0014] A permanent magnet positioning ring is provided on the inner circumferential surface of the working cylinder, and the left and right end surfaces of the permanent magnet positioning ring are in contact with the left and right inner walls of the working cylinder; a permanent magnet ring groove II is provided on the permanent magnet positioning ring, and the permanent magnet ring III is arranged in the permanent magnet ring groove II, and the inner circumferential surface of the permanent magnet ring III is flush with or lower than the inner circumferential surface of the permanent magnet positioning ring; the outer circumferential surface formed by the convex ring I and the piston body corresponds to the inner circumferential surface of the permanent magnet positioning ring, and a gap is left between them; a gap is left between the coil and the inner circumferential surface of the permanent magnet positioning ring; the magnetorheological fluid is filled in each gap.

[0015] The axial widths of the permanent magnet rings I and II on the corresponding convex parts I and II are equal, and the axial positions of the permanent magnet rings I and II are the same;

[0016] The inner circumferential surface of the permanent magnet positioning ring is provided with multiple groups of permanent magnet ring grooves and permanent magnet ring III; each group of permanent magnet ring grooves and permanent magnet ring III is equidistantly spaced; each permanent magnet ring III is an axially magnetized permanent magnet, and the magnetic lines of force of each permanent magnet ring III are in the same direction.

[0017] Each of the permanent magnet rings I and each of the permanent magnet rings II are radially magnetized permanent magnets, and the magnetic lines of force of the permanent magnet rings I and the permanent magnet rings II are the same.

[0018] The working cylinder, piston rod and piston body are all made of magnetic conductive materials.

[0019] The gap between the inner and outer circular surfaces of the convex portion I and the upper and lower side walls of the corresponding annular groove I is 0.5mm-20mm; the gap between the end face of the convex ring V and the bottom wall of the corresponding annular groove I is 0.5mm-20mm; the gap between the end face of the convex ring III and the bottom wall of the corresponding annular groove II is 0.5mm-20mm; the outer circular surface formed by the convex ring I and the piston body corresponds to the inner circular surface of the permanent magnet positioning ring, and the gap between them is 0.5mm-30mm.

[0020] A sealing ring groove I is arranged on the inner circumferential surface of the piston rod hole, and a sealing ring I is arranged in the sealing ring groove I.

[0021] The working cylinder comprises an end cover and a cylinder body, and a sealing ring II is provided at the connection between the end cover and the cylinder body.

[0022] The middle part of the piston rod is a threaded rod, which is threadedly connected to the piston body.

[0023] A piston rod mounting convex ring is arranged at the middle of the left and right inner walls of the working cylinder, and the piston rod hole is arranged on the piston rod mounting convex ring.

[0024] A wire guide groove is arranged in the piston rod, and electric wires are arranged in the wire guide groove to respectively connect the coil on the piston body and the external power supply.

[0025] The present invention realizes an embedded shearing magnetorheological damper by changing the cylinder body structure of the working cylinder, embedding the working cylinder and the piston body to increase the length of the magnetorheological fluid damping channel, providing a series of axially magnetized permanent magnets on the inner wall of the cylinder body, and providing radially magnetized permanent magnets on the end wall of the working cylinder and the piston body to cooperate with each other, and the series-connected permanent magnets are connected in series with the coils in the grooves on the outer circular surface of the piston body.

[0026] The present invention reduces the volume of magnetorheological fluid used in the work, has the advantages of small amount of magnetorheological fluid required and significant magnetorheological effect, and greatly improves the magnetorheological damping force.

[0027] The present invention also has the advantage that the magnetorheological fluid in the damping channel is not prone to sedimentation and clogging.

[0028] The present invention overcomes the problem of insufficient damping force and inflexible adjustment of the damping force of the magnetic fluid shock absorber, effectively improves the damping force under the same volume, avoids unstable operation caused by coil energization failure, solves the problem of easy precipitation of magnetorheological fluid, and improves the utilization rate of magnetorheological fluid. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 A schematic diagram of the structure of the magnetorheological damper of the present invention;

[0030] The serial numbers and corresponding names in the figure are as follows:

[0031] 1-working cylinder, 2-piston rod, 3-piston body, 4-magnetorheological fluid, 5-permanent magnet positioning ring, 6-permanent magnet ring I, 7-permanent magnet ring II, 8-permanent magnet ring III, 9-coil, 10-convex ring I, 11-convex ring II, 12-annular groove I, 13-convex ring III, 14-annular groove II, 15-convex ring V, 16-end cover, 17-cylinder body, 18-sealing ring II, 19-threaded rod, 20-convex ring IV, 21-sealing ring I, 22-piston rod mounting convex ring, 23-lead groove. DETAILED DESCRIPTION

[0032] The present invention will be further described below in conjunction with the accompanying drawings.

[0033] like Figure 1 As shown, the embedded shearing magnetorheological damper comprises a working cylinder 1, a piston rod 2, a piston body 3, a magnetorheological fluid 4, a permanent magnet positioning ring 5, a permanent magnet ring I6, a permanent magnet ring II7, a permanent magnet ring III8, and a coil 9;

[0034] The two ends of the piston rod 2 pass through the piston rod hole and pass through the left and right end surfaces of the working cylinder 1 respectively, and can slide along the piston rod hole relative to the working cylinder 1; the piston body 3 is arranged in the working cylinder 1, and the piston body 3 is fixedly connected to the middle part of the piston rod 2, and the axis of the piston body 3 and the piston rod 2 coincide;

[0035] The outer edges of the left and right end surfaces of the piston body 3 are respectively provided with convex rings 110, the outer circumferential surface of the convex ring 110 is flush with the outer circumferential surface of the piston body 3, and the outer circumferential surface formed by the convex ring 110 and the piston body 3 is provided with a coil ring groove, and the coil 9 is arranged in the coil ring groove;

[0036] A plurality of convex rings II11 are arranged at intervals on the left and right end surfaces of the piston body 3, and an annular groove I12 is formed between the convex ring I10 and the convex ring II11, and between each convex ring II11; a permanent magnet ring I6 is mounted on the end surface of each convex ring II11, and a convex ring III13 is mounted on the end surface of each permanent magnet ring I6; the inner and outer circular surfaces of each convex ring II11 are respectively flush with the permanent magnet ring I6 mounted thereon, and the inner and outer circular surfaces of the convex ring III13 mounted on the permanent magnet ring I6;

[0037] The left and right inner wall shapes of the working cylinder 1 correspond to the left and right end surface structural design of the piston body 3. The left and right inner walls of the working cylinder 1 are provided with convex rings IV20 corresponding to the annular grooves I12 at intervals. An annular groove II14 is formed between each convex ring IV20. Each annular groove II14 corresponds to the convex ring II11 one by one. Each convex ring IV20 is provided with a permanent magnet ring II7. The end surface of each permanent magnet ring II7 is provided with a convex ring V15. The inner and outer circular surfaces of each convex ring IV20 are respectively flush with the permanent magnet ring II7 provided thereon, and the inner and outer circular surfaces of the convex ring V15 provided thereon.

[0038] The convex portion I composed of the convex ring IV20, the permanent magnet ring II7, and the convex ring V15 extends into the corresponding annular groove I12, and the convex portion II composed of the convex ring II11, the permanent magnet ring I6, and the convex ring III13 extends into the corresponding annular groove II14; there are gaps between the inner and outer circular surfaces of the convex portion I and the inner and outer circular surfaces of the convex ring I10 and the convex portion II that constitute the upper and lower side walls of the corresponding annular groove I12;

[0039] A gap is left between the end face of the convex ring V15 and the bottom wall of the corresponding annular groove I12, and the gap is filled with magnetorheological fluid 4; a gap is left between the end face of the convex ring III13 and the bottom wall of the corresponding annular groove II14;

[0040] A permanent magnet positioning ring 5 is provided on the inner circumferential surface of the working cylinder 1, and the left and right end surfaces of the permanent magnet positioning ring 5 are in contact with the left and right inner walls of the working cylinder 1; a permanent magnet ring groove II is provided on the permanent magnet positioning ring 5, and the permanent magnet ring III8 is arranged in the permanent magnet ring groove II, and the inner circumferential surface of the permanent magnet ring III8 is flush with or lower than the inner circumferential surface of the permanent magnet positioning ring 5; the outer circumferential surface formed by the convex ring I10 and the piston body 3 corresponds to the inner circumferential surface of the permanent magnet positioning ring 5, and a gap is left between them; a gap is left between the coil 9 and the inner circumferential surface of the permanent magnet positioning ring 5; the magnetorheological fluid 4 is filled in each gap.

[0041] The axial widths of the permanent magnet rings I6 and II7 on the corresponding convex parts I and II are equal, and the axial positions of the permanent magnet rings I6 and II7 are the same;

[0042] The inner surface of the permanent magnet positioning ring 5 is provided with multiple groups of permanent magnet ring grooves and permanent magnet rings III8; each group of permanent magnet ring grooves and permanent magnet rings III8 are equidistantly spaced; each permanent magnet ring III8 is an axially magnetized permanent magnet, and the magnetic lines of force of each permanent magnet ring III8 are in the same direction.

[0043] Each of the permanent magnet rings I6 and each of the permanent magnet rings II7 are radially magnetized permanent magnets, and the directions of the magnetic lines of force of the permanent magnet rings I6 and II7 are the same.

[0044] The working cylinder 1, piston rod 2 and piston body 3 are all made of magnetic conductive materials.

[0045] The gap between the inner and outer circular surfaces of the convex portion I and the upper and lower side walls of the corresponding annular groove I12 is 0.5mm-20mm; the gap between the end face of the convex ring V15 and the bottom wall of the corresponding annular groove I12 is 0.5mm-20mm; the gap between the end face of the convex ring III13 and the bottom wall of the corresponding annular groove II14 is 0.5mm-20mm; the outer circular surface formed by the convex ring I10 and the piston body 3 corresponds to the inner circular surface of the permanent magnet positioning ring 5, and the gap between them is 0.5mm-30mm.

[0046] A sealing ring groove I is provided on the inner circumferential surface of the piston rod hole, and a sealing ring I 21 is provided in the sealing ring groove I.

[0047] The working cylinder 1 comprises an end cover 16 and a cylinder body 17 , and a sealing ring II 18 is provided at the connection between the end cover 16 and the cylinder body 17 .

[0048] The middle portion of the piston rod 2 is a threaded rod 19 , which is threadedly connected to the piston body 3 .

[0049] A piston rod mounting convex ring 22 is provided in the middle of the left and right inner walls of the working cylinder 1 , and the piston rod hole is provided on the piston rod mounting convex ring 22 .

[0050] A wire guide groove 23 is provided in the piston rod 2, and wires are provided in the wire guide groove 23 to connect the coil 9 on the piston body 3 and an external power source respectively.

Claims

1. An embedded shearing magnetorheological damper, comprising a working cylinder (1), a piston rod (2), a piston body (3), a magnetorheological fluid (4), a permanent magnet positioning ring (5), a permanent magnet ring I (6), a permanent magnet ring II (7), a permanent magnet ring III (8), and a coil (9), characterized in that: The two ends of the piston rod (2) pass through the piston rod hole and pass through the left and right end surfaces of the working cylinder (1), respectively, and can slide along the piston rod hole relative to the working cylinder (1); the piston body (3) is arranged in the working cylinder (1), the piston body (3) is fixedly connected to the middle part of the piston rod (2), and the axis of the piston body (3) and the piston rod (2) coincide with each other; A convex ring I (10) is provided on the outer edges of the left and right end surfaces of the piston body (3), respectively. The outer circumferential surface of the convex ring I (10) is flush with the outer circumferential surface of the piston body (3). A coil ring groove is provided on the outer circumferential surface formed by the convex ring I (10) and the piston body (3), and a coil (9) is provided in the coil ring groove. A plurality of convex rings II (11) are arranged at intervals on the left and right end surfaces of the piston body (3); an annular groove I (12) is formed between the convex ring I (10) and the convex ring II (11), and between each convex ring II (11); a permanent magnet ring I (6) is mounted on the end surface of each convex ring II (11); a convex ring III (13) is mounted on the end surface of each permanent magnet ring I (6); the inner and outer circumferential surfaces of each convex ring II (11) are respectively flush with the permanent magnet ring I (6) mounted thereon, and the inner and outer circumferential surfaces of the convex ring III (13) mounted on the permanent magnet ring I (6); The left and right inner walls of the working cylinder (1) correspond to the left and right end surface structural design of the piston body (3); convex rings IV (20) corresponding to the annular grooves I (12) are arranged on the left and right inner walls of the working cylinder (1) at intervals; annular grooves II (14) are formed between the convex rings IV (20); the annular grooves II (14) correspond to the convex rings II (11) respectively; a permanent magnet ring II (7) is mounted on each convex ring IV (20); and a convex ring V (15) is mounted on the end surface of each permanent magnet ring II (7); the inner and outer circumferential surfaces of each convex ring IV (20) are respectively flush with the permanent magnet ring II (7) mounted thereon, and the inner and outer circumferential surfaces of the convex ring V (15) mounted on the permanent magnet ring II (7); The convex portion I formed by the convex ring IV (20), the permanent magnet ring II (7) and the convex ring V (15) extends into the corresponding annular groove I (12); the convex portion II formed by the convex ring II (11), the permanent magnet ring I (6) and the convex ring III (13) extends into the corresponding annular groove II (14); gaps are left between the inner and outer circular surfaces of the convex portion I and the inner and outer circular surfaces of the convex portion II, which respectively form the upper and lower side walls of the corresponding annular groove I (12); A gap is left between the end surface of the convex ring V (15) and the bottom wall of the corresponding annular groove I (12); a gap is left between the end surface of the convex ring III (13) and the bottom wall of the corresponding annular groove II (14); A permanent magnet positioning ring (5) is provided on the inner circumferential surface of the working cylinder (1), and the left and right end surfaces of the permanent magnet positioning ring (5) are in contact with the left and right inner walls of the working cylinder (1); a permanent magnet ring groove II is provided on the permanent magnet positioning ring (5), and the permanent magnet ring III (8) is arranged in the permanent magnet ring groove II, and the inner circumferential surface of the permanent magnet ring III (8) is flush with or lower than the inner circumferential surface of the permanent magnet positioning ring (5); the outer circumferential surface formed by the convex ring I (10) and the piston body (3) corresponds to the inner circumferential surface of the permanent magnet positioning ring (5), and a gap is left between them; a gap is left between the coil (9) and the inner circumferential surface of the permanent magnet positioning ring (5); and the magnetorheological fluid (4) is filled in each gap; The axial widths of the permanent magnet rings I (6) and the permanent magnet rings II (7) on the corresponding convex parts I and II are equal, and the axial positions of the permanent magnet rings I (6) and the permanent magnet rings II (7) are the same; The inner circumferential surface of the permanent magnet positioning ring (5) is provided with a plurality of groups of permanent magnet ring grooves and permanent magnet ring III (8); each group of permanent magnet ring grooves and permanent magnet ring III (8) is equidistantly spaced; each permanent magnet ring III (8) is an axially magnetized permanent magnet, and the magnetic lines of force of each permanent magnet ring III (8) are in the same direction; each permanent magnet ring I (6) and permanent magnet ring II (7) is a radially magnetized permanent magnet, and the magnetic lines of force of the permanent magnet ring I (6) and permanent magnet ring II (7) are in the same direction.

2. The embedded shearing magnetorheological damper according to claim 1, characterized in that: The working cylinder (1), piston rod (2) and piston body (3) are all made of magnetic conductive material.

3. The embedded shearing magnetorheological damper according to claim 1, characterized in that: The gap between the inner and outer circumferential surfaces of the convex ring I (10) and the upper and lower side walls of the corresponding annular groove I (12) is 0.5 mm-20 mm; the gap between the end surface of the convex ring V (15) and the bottom wall of the corresponding annular groove I (12) is 0.5 mm-20 mm; the gap between the end surface of the convex ring III (13) and the bottom wall of the corresponding annular groove II (14) is 0.5 mm-20 mm; the outer circumferential surface formed by the convex ring I (10) and the piston body (3) corresponds to the inner circumferential surface of the permanent magnet positioning ring (5), and the gap between them is 0.5 mm-30 mm.

4. The embedded shearing magnetorheological damper according to claim 1, characterized in that: A sealing ring groove I is provided on the inner circumferential surface of the piston rod hole, and a sealing ring I (21) is provided in the sealing ring groove I.

5. The embedded shearing magnetorheological damper according to claim 1, characterized in that: The working cylinder (1) comprises an end cover (16) and a cylinder body (17), and a sealing ring II (18) is provided at the connection between the end cover (16) and the cylinder body (17).

6. The embedded shearing magnetorheological damper according to claim 1, characterized in that: The middle portion of the piston rod (2) is a threaded rod (19), which is threadedly connected to the piston body (3) via the threaded rod (19).

7. The embedded shearing magnetorheological damper according to claim 1, characterized in that: A piston rod mounting convex ring (22) is provided in the middle of the left and right inner walls of the working cylinder (1), and the piston rod hole is provided on the piston rod mounting convex ring (22).

8. The embedded shearing magnetorheological damper according to claim 1, characterized in that: A wire guide groove (23) is provided in the piston rod (2), and wires are provided in the wire guide groove (23) to respectively connect the coil (9) on the piston body (3) and an external power source.

Images