A stepped magnetorheological damper

Abstract

The purpose of the present invention is to provide a stepped magnetorheological damper, comprising a working cylinder, a piston rod, a piston body of an electromagnetic piston, a magnetorheological fluid, a permanent magnet positioning ring, a permanent magnet ring, and a coil, wherein the piston body is in the shape of a stepped shaft. 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 a stepped 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 external magnetic field, the purpose of adjustable 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. Other existing magnetorheological dampers also have many technical problems, such as low utilization rate of magnetorheological fluid, fixed damping force adjustment range, inability to flexibly adjust, sometimes failure of energized coil, inability to ensure stable operation and other problems. Summary of the invention

[0004] The purpose of the present invention is to provide a stepped 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.

[0005] The technical solution of the present invention is as follows:

[0006] The stepped magnetorheological damper comprises a working cylinder, a piston rod, a piston body, a magnetorheological fluid, a permanent magnet positioning ring, a permanent magnet ring, and a coil;

[0007] The piston body is in the shape of a stepped shaft, the middle one is a primary shaft, which has the largest radius, and one or more secondary shafts are arranged on the left and right sides of the primary shaft, and the radius of each secondary shaft decreases in sequence from the left and right directions of the primary shaft;

[0008] The left and right end walls of the working cylinder are respectively provided with piston rod holes, and the two ends of the piston rod respectively pass through the piston holes and go out of the left and right end surfaces of the working cylinder, and can slide along the piston holes 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 inner wall shape of the working cylinder corresponds to the structural design of the piston body, and also includes a primary ring groove corresponding to the primary shaft and a secondary ring groove corresponding to each secondary shaft; a gap is left between the end face and outer cylindrical surface of each secondary shaft on the piston body and the end wall and inner cylindrical surface of each secondary ring groove of the corresponding working cylinder;

[0010] A coil ring groove is provided on the outer circumferential surface of the primary shaft, a coil is provided in the coil ring groove, and the outer circumferential surface of the coil is flush with the outer circumferential surface of the primary shaft; a permanent magnet positioning ring is provided on the inner circumferential surface of the primary ring groove of the working cylinder, and the left and right end surfaces of the permanent magnet positioning ring are in contact with the inner walls of the left and right ends of the primary ring groove; a permanent magnet ring groove is provided on the permanent magnet positioning ring, and the permanent magnet ring is provided in the permanent magnet ring groove, and the inner circumferential surface of the permanent magnet ring is flush with the inner circumferential surface of the permanent magnet positioning ring;

[0011] The outer cylindrical surface of the primary shaft corresponds to the inner cylindrical surface of the permanent magnet positioning ring, and a gap is left between them; a gap is left between the left and right end surfaces of the primary shaft and the left and right end inner walls of the primary ring groove; a gap is left between the outer cylindrical surface of the coil and the inner cylindrical surface of the permanent magnet positioning ring; and the magnetorheological fluid is filled in each gap.

[0012] The inner circumferential surface of the permanent magnet positioning ring is provided with a plurality of groups of permanent magnet ring grooves and permanent magnet rings.

[0013] Each group of permanent magnet ring grooves and permanent magnet rings are distributed at equal intervals.

[0014] Each permanent magnet ring is an axially magnetized permanent magnet, and the directions of the magnetic lines of force of each permanent magnet ring are the same.

[0015] The working cylinder and the piston body are both made of magnetic conductive materials.

[0016] The gap size between the end face and outer cylindrical surface of each secondary shaft on the piston body and the end wall and inner cylindrical surface of each secondary ring groove of the working cylinder is 0.3mm-20mm; the gap size between the outer cylindrical surface of the primary shaft and the inner cylindrical surface of the permanent magnet positioning ring is 0.3mm-20mm; the gap size between the left and right end faces of the primary shaft and the left and right end inner walls of the primary ring groove is 0.3mm-20mm.

[0017] 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.

[0018] A sealing ring groove I is arranged on the inner circumferential surface of the piston hole, and a sealing ring I is arranged in the sealing ring groove I.

[0019] The working cylinder is composed of two symmetrical half cylinders, which are connected by hexagon socket head screws. The connection is located at the primary ring groove. The left and right end faces of the permanent magnet positioning ring are provided with sealing ring grooves II, and sealing ring II is provided in the sealing ring grooves II.

[0020] Both ends of the piston rod are provided with lifting rings for installation.

[0021] The middle part of the piston rod is a threaded rod, which is threadedly connected to the piston body.

[0022] The present invention increases the length of the damping channel and greatly improves the damping force and damping effect by designing the shape of the piston and the housing into a stepped shape, and the stepped outer wall of the piston matches the stepped inner wall of the working cylinder. By controlling the gap size between the left and right end faces of the piston body and the left and right inner walls of the working cylinder, the volume of the magnetorheological fluid channel is greatly reduced, the volume of the working magnetorheological fluid is reduced, and the magnetorheological damping force is greatly improved. The invention has the advantages of less magnetorheological fluid consumption and significant magnetorheological effect.

[0023] The present invention connects a pair of permanent magnet sources in series on the inner wall of the working cylinder body in series with the magnetic source generated by the energized coil in the groove on the outer circumferential surface of the piston body, thereby increasing the magnetic field strength in the magnetic circuit and further improving the damping force of the damper. When the same coil and the same current strength are used, the output force of the stepped magnetorheological damper of the present invention is much greater than that of the common magnetorheological damper. The present invention overcomes the problem of insufficient damping force of the existing magnetorheological damper.

[0024] The present invention overcomes the problems 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 due to coil energization failure, and improves the utilization rate of the magnetorheological fluid. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 A schematic diagram of the structure of the magnetorheological damper of the present invention;

[0026] The serial numbers and corresponding names in the figure are as follows:

[0027] 1-working cylinder, 2-piston rod, 3-piston body, 4-magnetorheological fluid, 5-permanent magnet positioning ring, 6-permanent magnet ring, 7-coil, 8-lead groove, 9-sealing ring I, 10-primary shaft, 11-primary ring groove, 12-sealing ring II, 13-threaded rod, 14-half cylinder, 15-hexagonal cylindrical head screw, 16-lifting ring. DETAILED DESCRIPTION

[0028] The present invention will be further described below in conjunction with the accompanying drawings.

[0029] like Figure 1 As shown, the stepped 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 6, and a coil 7;

[0030] The piston body 3 is in the shape of a stepped shaft, the middle one is the primary shaft 10, which has the largest radius, and one or more secondary shafts are arranged on the left and right sides of the primary shaft 10, and the radius of each secondary shaft decreases in sequence from the primary shaft 10 to the left and right sides;

[0031] The left and right end walls of the working cylinder 1 are respectively provided with piston rod holes, and the two ends of the piston rod 2 pass through the piston holes and pass through the left and right end surfaces of the working cylinder 1 respectively, and can slide along the piston holes 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;

[0032] The inner wall shape of the working cylinder 1 corresponds to the structural design of the piston body 3, and also includes a primary ring groove 11 corresponding to the primary shaft 10 and secondary ring grooves corresponding to each secondary shaft; a gap is left between the end face and outer circumference of each secondary shaft on the piston body 3 and the end wall and inner circumference of each secondary ring groove of the corresponding working cylinder 1, and the gap is filled with magnetorheological fluid 4;

[0033] A coil ring groove is provided on the outer circumferential surface of the primary shaft 10, and a coil 7 is provided in the coil ring groove, and the outer circumferential surface of the coil 7 is flush with the outer circumferential surface of the primary shaft 10; a permanent magnet positioning ring 5 is provided on the inner circumferential surface of the primary ring groove 11 of the working cylinder 1, and the left and right end surfaces of the permanent magnet positioning ring 5 are in contact with the inner walls of the left and right ends of the primary ring groove 11; a permanent magnet ring groove is provided on the permanent magnet positioning ring 5, and the permanent magnet ring 6 is provided in the permanent magnet ring groove, and the inner circumferential surface of the permanent magnet ring 6 is flush with the inner circumferential surface of the permanent magnet positioning ring 5;

[0034] The outer circumferential surface of the primary shaft 10 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 left and right end surfaces of the primary shaft 10 and the left and right end inner walls of the primary ring groove 11; a gap is left between the outer circumferential surface of the coil 7 and the inner circumferential surface of the permanent magnet positioning ring 5; and the magnetorheological fluid 4 is filled in each gap.

[0035] 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 rings 6 .

[0036] Each group of permanent magnet ring grooves and the permanent magnet ring 6 are equidistantly spaced.

[0037] Each permanent magnet ring 6 is an axially magnetized permanent magnet, and the directions of the magnetic lines of force of each permanent magnet ring 6 are the same.

[0038] The working cylinder 1 and the piston body 3 are both made of magnetic conductive materials.

[0039] The gap size between the end face and outer cylindrical surface of each secondary shaft on the piston body 3 and the end wall and inner cylindrical surface of each secondary ring groove of the working cylinder 1 is 0.3mm-20mm; the gap size between the outer cylindrical surface of the primary shaft 10 and the inner cylindrical surface of the permanent magnet positioning ring 5 is 0.3mm-20mm; the gap size between the left and right end faces of the primary shaft 10 and the left and right end inner walls of the primary ring groove 11 is 0.3mm-20mm.

[0040] A wire guide groove 8 is provided in the piston rod 2, and wires are provided in the wire guide groove 8 to connect the coil 7 on the piston body 3 and an external power source respectively.

[0041] A sealing ring groove I is arranged on the inner circumferential surface of the piston hole, and a sealing ring I9 is ​​arranged in the sealing ring groove I.

[0042] The working cylinder 1 is composed of two symmetrical half cylinders 14, which are connected by a hexagon socket head screw 15, and the connection is located at the primary ring groove 11. The left and right end faces of the permanent magnet positioning ring 5 are provided with sealing ring grooves II, and a sealing ring II 12 is provided in the sealing ring groove II.

[0043] Both ends of the piston rod 2 are provided with lifting rings 16 for installation.

[0044] The middle portion of the piston rod 2 is a threaded rod 13 , which is threadedly connected to the piston body 3 .

Claims

1. A stepped 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 (6), and a coil (7), characterized in that: The piston body (3) is in the shape of a stepped shaft, the middle of which is a primary shaft (10) having the largest radius, and one or more secondary shafts are arranged on the left and right sides of the primary shaft (10), and the radii of the secondary shafts decrease in sequence from the primary shaft (10) to the left and right sides; The left and right end walls of the working cylinder (1) are respectively provided with piston rod holes, and the two ends of the piston rod (2) pass through the piston holes and pass through the left and right end surfaces of the working cylinder (1) respectively, and can slide along the piston holes 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; The inner wall shape of the working cylinder (1) corresponds to the structural design of the piston body (3), and also includes a primary ring groove (11) corresponding to the primary shaft (10) and secondary ring grooves corresponding to each secondary shaft; a gap is left between the end face and outer circumferential surface of each secondary shaft on the piston body (3) and the end wall and inner circumferential surface of each secondary ring groove of the corresponding working cylinder (1); A coil ring groove is provided on the outer circumferential surface of the primary shaft (10), a coil (7) is provided in the coil ring groove, and the outer circumferential surface of the coil (7) is flush with the outer circumferential surface of the primary shaft (10); a permanent magnet positioning ring (5) is provided on the inner circumferential surface of the primary ring groove (11) 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 end inner walls of the primary ring groove (11); a permanent magnet ring groove is provided on the permanent magnet positioning ring (5), and the permanent magnet ring (6) is provided in the permanent magnet ring groove, and the inner circumferential surface of the permanent magnet ring (6) is flush with the inner circumferential surface of the permanent magnet positioning ring (5); The outer circumferential surface of the primary shaft (10) 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 left and right end surfaces of the primary shaft (10) and the left and right end inner walls of the primary ring groove (11); a gap is left between the outer circumferential surface of the coil (7) and the inner circumferential surface of the permanent magnet positioning ring (5); and the magnetorheological fluid (4) is filled in each gap; 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 rings (6); each group of permanent magnet ring grooves and permanent magnet rings (6) are arranged at equal intervals; Each permanent magnet ring (6) is an axially magnetized permanent magnet, and the directions of the magnetic lines of force of each permanent magnet ring (6) are the same; The working cylinder (1) and the piston body (3) are both made of magnetic conductive material.

2. The stepped magnetorheological damper according to claim 1, characterized in that: The gap size between the end face and outer cylindrical surface of each secondary shaft on the piston body (3) and the end wall and inner cylindrical surface of each secondary ring groove of the working cylinder (1) is 0.3 mm-20 mm; the gap size between the outer cylindrical surface of the primary shaft (10) and the inner cylindrical surface of the permanent magnet positioning ring (5) is 0.3 mm-20 mm; the gap size between the left and right end faces of the primary shaft (10) and the left and right end inner walls of the primary ring groove (11) is 0.3 mm-20 mm.

3. The stepped magnetorheological damper according to claim 1, characterized in that: A wire guide groove (8) is provided in the piston rod (2), and wires are provided in the wire guide groove (8) to respectively connect the coil (7) on the piston body (3) and an external power source.

4. The stepped magnetorheological damper according to claim 1, characterized in that: A sealing ring groove I is provided on the inner circumferential surface of the piston hole, and a sealing ring I (9) is provided in the sealing ring groove I.

5. The stepped magnetorheological damper according to claim 1, characterized in that: The working cylinder (1) is composed of two symmetrical half cylinders (14), the two half cylinders (14) are connected by a hexagon socket head screw (15), and the connection point is located at the primary ring groove (11). The left and right end faces of the permanent magnet positioning ring (5) are provided with a sealing ring groove II, and a sealing ring II (12) is provided in the sealing ring groove II.

6. The stepped magnetorheological damper according to claim 1, characterized in that: Both ends of the piston rod (2) are provided with lifting rings (16) for installation.

7. The stepped magnetorheological damper according to claim 1, characterized in that: The middle portion of the piston rod (2) is a threaded rod (13), which is threadedly connected to the piston body (3) via the threaded rod (13).

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