Variable-stiffness variable-damping magnetorheological damper

Abstract

The utility model provides a magnetorheological damper with variable rigidity and variable damping. The magnetorheological damper mainly comprises a piston rod, a piston head, a spring, a magnetic spring floating piston, a magnet exciting coil and the like. Under the action of a magnetic field, an annular flow channel in the piston head generates a magnetorheological effect, the shear yield stress of magnetorheological fluid is increased, damping force is generated, the magnetic spring floating piston is used for compensating volume change, resistance is provided through the permanent magnets connected with the magnetic spring floating piston, and magnet exciting coils on the outer sides of the permanent magnets at the upper and lower positions can be used for enhancing or weakening the magnetic field. Different repulsive forces are provided for the permanent magnet connected to the magnetic spring floating piston, and the required force is changed under the condition that the displacement of the piston head is the same, so that the rigidity of the magnetorheological damper is changed; effective control over damping and rigidity can be achieved by changing the current magnitude of the corresponding magnet exciting coil.

Description

Technical Field

[0001] The utility model relates to a magnetorheological damper, in particular to a magnetorheological damper with variable stiffness and variable damping. Background Art

[0002] Magnetorheological dampers are a new type of intelligent damping device that uses magnetorheological fluid as its working medium. Developed based on the magnetorheological effect, magnetorheological dampers offer advantages such as simple structure, compact size, low energy consumption, and fast response. Due to their adjustable damping properties, they are widely used in vibration control applications such as automotive, vibration reduction, and prosthetics.

[0003] Currently, most variable-stiffness, variable-damping magnetorheological dampers typically consist of an inner and outer cylinder coupled with multiple springs to achieve variable damping and stiffness. This relatively complex structure, coupled with an increased volume, presents limitations and makes it difficult to meet practical application requirements under varying operating conditions.

[0004] Based on this, the utility model proposes a magnetorheological damper with variable stiffness and variable damping, which achieves variable stiffness through a magnetic spring floating piston while having the advantage of a compact structure. Summary of the Invention

[0005] To overcome the shortcomings of the magnetorheological damper described in the background art and meet the requirements of engineering applications, the present invention proposes a magnetorheological damper with variable stiffness and damping. The magnetorheological damper mainly consists of a piston rod, a piston head, a spring, a magnetic spring floating piston, and an excitation coil. The internal winding frame of the piston head cooperates with the piston sleeve to form an annular liquid flow channel. Under the action of the magnetic field, a magnetorheological effect occurs in the annular liquid flow channel, increasing the shear yield stress of the magnetorheological fluid, generating a damping force that hinders the movement of the piston rod. While the magnetic spring floating piston is used to compensate for volume changes, the repulsive force generated between the permanent magnets also hinders the movement of the piston rod. By changing the current flowing through the excitation coil surrounding the permanent magnets, the repulsive force between the permanent magnets can be strengthened or weakened accordingly, thereby adjusting the stiffness of the magnetorheological damper. By changing the current flowing through the excitation coil inside the piston head, the damping force can be effectively controlled.

[0006] The technical solution adopted by the utility model to solve the technical problem includes: a cylinder (1), a piston lower end cover (2), an excitation coil I (3), a piston sleeve (4), a winding frame I (5), a piston upper end cover (6), a piston rod (7), an upper end cover (8), a spring (9), a permanent magnet I (10), a limit block I (11), an accumulator end cover (12), an excitation coil II (13), a winding frame II (14), a permanent magnet II (15), a limit block II (16), an excitation coil III (17), a permanent magnet III (18), a winding frame III (19), and a floating piston (20); the piston rod (7) is processed The outer circumferential surface of the bottom of the damper is processed with external threads; the upper end cover (8) of the damper is fixedly connected to the cylinder (1) by screws and sealed by a sealing ring; the upper end cover (8) of the damper is processed with a central through hole, the piston rod (7) passes through the central through hole of the upper end cover (8) of the damper and is sealed by a sealing ring; the excitation coil I (3) is wound on the winding frame I (5); the winding frame I (5) and the piston sleeve (4) are fixed with screws through the piston upper end cover (6) and the piston lower end cover (2) to form a piston head; the piston rod (7) is connected to the winding frame I (5) by threads; the upper circumference of the floating piston (20) is The surface (2001) passes through the central through hole of the winding frame III (19), and the lower circumferential surface (2002) is sealed with the inner circumferential surface (102) of the cylinder (1) by a sealing ring; the inner circumferential surface (102) of the cylinder (1) is processed with a positioning and fixing boss (103) for positioning and fixing the winding frame III (19); the upper end of the floating piston (20) is processed into a step shape, and the permanent magnet II (15) is fixed with screws through the limit block I (11) and the floating piston (20); the excitation coil II (13) is wound on the winding frame II (14); the excitation coil III (17) is wound on the winding frame III (19); the permanent The magnet I (10) is positioned by the winding frame II (14) and fixed by the accumulator end cover (12); the permanent magnet III (18) is positioned by the winding frame III (19) and fixed by the limit block II (16); the accumulator end cover (12) is fixed to the cylinder (1) by screws; the cylinder (1), the accumulator end cover (12), the winding frame II (14), the permanent magnet I (10), the excitation coil II (13), the limit block II (16), the winding frame III (19), the permanent magnet III (18), the excitation coil III (17), the floating piston (20), the permanent magnet II (15), and the limit block I (11) constitute a magnetic spring floating piston.

[0007] Compared with the background technology, the present invention has the following beneficial effects:

[0008] (1) The magnetorheological damper of the utility model realizes variable stiffness of the magnetorheological damper through a magnetic spring floating piston, has a compact structure and occupies little space.

[0009] (2) The magnetorheological damper of the utility model can achieve independent adjustment of stiffness and damping by adjusting the current in the excitation coil II (13), the excitation coil III (17) in the magnetic spring floating piston and the excitation coil I (3) in the piston head. BRIEF DESCRIPTION OF THE DRAWINGS

[0010] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for the embodiments or the description of the prior art. The drawings described below are an embodiment of the present invention. For those skilled in the art, other drawings can be derived from these drawings without inventive effort.

[0011] Figure 1 It is a schematic structural diagram of the utility model.

[0012] Figure 2 It is a cross-sectional view of the cylinder of the present utility model.

[0013] Figure 3 It is a cross-sectional view of the floating piston of the utility model.

[0014] Figure 4 This is the magnetic force line distribution diagram of the piston of the utility model.

[0015] Figure 5 This is the magnetic force line distribution diagram of the magnetic spring floating piston of the utility model.

[0016] Description of reference numerals:

[0017] 1-cylinder, 2-piston lower end cover, 3-excitation coil I, 4-piston sleeve, 5-winding frame I, 6-piston upper end cover, 7-piston rod, 8-upper end cover, 9-spring, 10-permanent magnet I, 11-limit block I, 12-accumulator end cover, 13-excitation coil II, 14-winding frame II, 15-permanent magnet II, 16-limit block II, 17-excitation coil III, 18-permanent magnet III, 19-winding frame III, 20-floating piston. DETAILED DESCRIPTION

[0018] The present invention will be further described below with reference to the accompanying drawings and embodiments:

[0019] Figure 1The utility model is shown as a schematic diagram of the structure. Cylinder (1), piston lower end cover (2), excitation coil I (3), piston sleeve (4), winding frame I (5), piston upper end cover (6), piston rod (7), upper end cover (8), spring (9), permanent magnet I (10), limit block I (11), accumulator end cover (12), excitation coil II (13), winding frame II (14), permanent magnet II (15), limit block II (16), excitation coil III (17), permanent magnet III (18), winding frame III (19), floating piston (20).

[0020] Figure 2 The utility model is a cross-sectional view of a cylinder barrel. A positioning and fixing boss (103) is machined inside the cylinder barrel (1).

[0021] Figure 3 This is a cross-sectional view of the floating piston of the utility model. The floating piston (20) is processed into a stepped shape.

[0022] Figure 4 This is a diagram of the magnetic force lines distribution of the piston of the utility model. The magnetic field generated by the excitation coil I (3) after being energized passes through the winding frame I (5), the annular liquid flow channel formed by the winding frame I (5) and the piston sleeve (4), the piston sleeve (4), the annular liquid flow channel formed by the winding frame I (5) and the piston sleeve (4), and the winding frame I (5) in sequence, forming a closed loop.

[0023] Figure 5 The present invention is a magnetic field distribution diagram of a magnetic spring floating piston. When the excitation coil II (13) is energized, the magnetic field generated passes through the cylinder (1), the winding frame II (14), the permanent magnet I (10), and the cylinder (1) in sequence, forming a closed loop. When the excitation coil III (17) is energized, the magnetic field generated passes through the cylinder (1), the winding frame III (19), the permanent magnet III (18), and the cylinder (1) in sequence, forming a closed loop.

[0024] The working principle of this utility model is as follows:

[0025] When an external excitation is applied, the piston rod displaces, generating a pressure differential within the cylinder. Under this pressure, the magnetorheological fluid flows through the annular fluid channel, while the magnetic spring floating piston compensates for volume. Current flowing through excitation coil I generates a magnetic field that passes through winding frame I, the annular fluid channel, the piston sleeve, the annular fluid channel, and finally winding frame I, forming a closed circuit. Under the influence of the magnetic field, the magnetorheological fluid flowing through the annular fluid channel experiences a magnetorheological effect, increasing its shear yield stress and generating a controllable damping force. By controlling the current flowing through excitation coil I, the magnetic field strength in the annular fluid channel and the shear yield stress of the magnetorheological fluid can be adjusted, achieving variable and controllable damping of the damper. When current is passed through the excitation coils II and III, the magnetic spring floating piston device will generate a stable and controllable magnetic flux. By changing the current flowing through the excitation coils II and III, the magnetic flux of the magnetic circuit between the mechanisms can be changed, thereby controlling the axial magnetic force between the permanent magnets and changing the stiffness of the magnetic spring floating piston device, thereby achieving variable and controllable damper stiffness.

Claims

1. A magnetorheological damper with variable stiffness and damping, characterized in that The invention comprises a cylinder (1), a piston lower end cover (2), an excitation coil I (3), a piston sleeve (4), a winding frame I (5), a piston upper end cover (6), a piston rod (7), an upper end cover (8), a spring (9), a permanent magnet I (10), a stopper I (11), an accumulator end cover (12), an excitation coil II (13), a winding frame II (14), a permanent magnet II (15), a stopper II (16), an excitation coil III (17), a permanent magnet III (18), a winding frame III (19), and a floating piston (20); the piston rod (7) is processed into a stepped shape, and the outer circumferential surface of the bottom thereof is processed into a stepped shape. External thread; the damper upper end cover (8) is fixedly connected to the cylinder (1) by screws and sealed by a sealing ring; the damper upper end cover (8) is processed with a central through hole, the piston rod (7) passes through the central through hole of the damper upper end cover (8) and is sealed by a sealing ring; the excitation coil I (3) is wound on the winding frame I (5); the winding frame I (5) and the piston sleeve (4) are fixed by screws through the piston upper end cover (6) and the piston lower end cover (2) to form a piston head; the piston rod (7) is connected to the winding frame I (5) by a thread; the upper circumferential surface (2001) of the floating piston (20) passes through the winding frame I (5) The central through hole of the bobbin III (19), the lower circumferential surface (2002) and the inner circumferential surface (102) of the cylinder (1) are sealed by a sealing ring; the inner circumferential surface (102) of the cylinder (1) is processed with a positioning and fixing boss (103) for positioning and fixing the bobbin III (19); the upper end of the floating piston (20) is processed into a step shape, and the permanent magnet II (15) is fixed by screws through the limit block I (11) and the floating piston (20); the excitation coil II (13) is wound on the bobbin II (14); the excitation coil III (17) is wound on the bobbin III (19); the permanent magnet I (10 ) is positioned by the winding frame II (14) and fixed by the accumulator end cover (12); the permanent magnet III (18) is positioned by the winding frame III (19) and fixed by the limit block II (16); the accumulator end cover (12) is fixed to the cylinder (1) by screws; the cylinder (1), the accumulator end cover (12), the winding frame II (14), the permanent magnet I (10), the excitation coil II (13), the limit block II (16), the winding frame III (19), the permanent magnet III (18), the excitation coil III (17), the floating piston (20), the permanent magnet II (15), and the limit block I (11) constitute a magnetic spring floating piston.

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