Magneto-rheological damper with additional nested cavity

Abstract

The magnetorheological damper comprises a piston rod, an outer sleeve, a piston head, an inner sleeve, a magnet exciting coil, a magnetorheological fluid channel and the like, all the cavities are filled with magnetorheological fluid, the yield stress of the magnetorheological fluid at a damping gap can be changed by adjusting the magnitude of current of the magnet exciting coil of the piston head, and therefore the damping effect is improved. On the basis, an outer sleeve is additionally arranged, an additional nesting cavity is defined between the outer sleeve and an inner sleeve, when the piston rod moves in the axial direction, the size of a working cavity can be correspondingly changed, and the size of the working cavity can be changed. At the moment, the additional nesting cavity can achieve volume compensation through flowing of the magnetorheological fluid in the fluid flow channel, idle stroke actuation of the magnetorheological damper is prevented, meanwhile, the additional nesting cavity enhances resistance of the magnetorheological fluid flowing through the channel, and a stronger damping force effect is provided.

Description

Technical Field

[0001] This utility model relates to the field of magnetorheological damper technology, and in particular to a magnetorheological damper with an additional nested chamber. Background Technology

[0002] A magnetorheological damper is an intelligent damping device used in various semi-active control systems. It generates a magnetic field by applying a current to an excitation coil, influencing the strength of the magnetorheological fluid. The freely flowing magnetorheological fluid in the damping gap can change from a viscous liquid to a semi-solid state within milliseconds, thus dynamically adjusting the output damping force. Magnetorheological dampers have advantages such as fast response, simple structure, small size, and low energy consumption, and are widely used in vehicle suspensions, seismic resistance of building structures, and weapon systems.

[0003] Most magnetorheological dampers currently in use require the installation of a floating piston and the reservation of a compensation chamber with a certain space. The floating piston and the compensation chamber occupy a large space of the magnetorheological damper, which reduces the working chamber area of ​​the magnetorheological damper, which is not conducive to the adjustment of the damping force performance. Utility Model Content

[0004] One object of this application is to provide a magnetorheological damper with an additional nested chamber that can provide volume compensation and increase adjustable damping force.

[0005] The technical solution adopted in this application is as follows: a magnetorheological damper with an additional nested chamber, including a piston rod, a left end cap, an outer sleeve, a piston head assembly, an inner sleeve, and a right end cap. The inner sleeve is provided with at least one first magnetorheological fluid channel, and the piston head assembly is provided with at least one axially distributed second magnetorheological fluid channel. The two ends of the inner sleeve are respectively connected to the left end cap and the right end cap. The outer sleeve is sleeved outside the inner sleeve, and the two ends of the outer sleeve are respectively connected to the left end cap and the right end cap. A chamber III is formed between the outer sleeve and the inner sleeve. The piston head assembly passes through the inner sleeve, and chamber I and chamber II are respectively provided on both sides of the piston head assembly. The two ends of the second magnetorheological fluid channel are respectively connected to chamber I and chamber II. The piston rod passes through the left end cap and is located on one side of the inner sleeve and connected to the piston head assembly. The two ends of the first magnetorheological fluid channel are respectively connected to chamber III and chamber II.

[0006] In some embodiments of this application, a chamber I is formed between the left end cover and the piston head assembly, and a chamber II is formed between the right end cover and the piston head assembly.

[0007] In some embodiments of this application, the piston head assembly includes a piston head and an excitation coil, the excitation coil being sleeved on the piston head, and the piston head being connected to the piston rod.

[0008] Furthermore, a permanent magnet is provided at the end of the piston head away from the piston rod, and the permanent magnet is connected to the piston head.

[0009] Furthermore, the piston head assembly includes a left end cap and a right end cap, with both ends of the piston head connected to the left end cap and the right end cap, respectively.

[0010] In some embodiments of this application, twelve first magnetorheological fluid channels are provided, with three channels forming a group. The four groups of first magnetorheological fluid channels are evenly distributed in the circumferential direction of the inner sleeve, and the three first magnetorheological fluid channels in each group are arranged sequentially along the axial direction of the inner sleeve.

[0011] In some embodiments of this application, twelve second magnetorheological fluid channels are provided, with three channels forming a group. The four groups of second magnetorheological fluid channels are evenly distributed in the circumferential direction of the piston head, and the three second magnetorheological fluid channels in each group are arranged sequentially along the radial direction of the piston head.

[0012] Furthermore, the cross-section of the second magnetorheological fluid channel is arc-shaped.

[0013] In some embodiments of this application, the piston rod is provided with a left lifting lug at the end away from the inner sleeve, and the left lifting lug is connected to the piston rod; the right end cap is provided with a right lifting lug at the end away from the inner sleeve, and the right lifting lug is connected to the right end cap.

[0014] The magnetorheological damper with an additional nested chamber obtained by this invention has the following advantages:

[0015] (1) This utility model adds an outer sleeve to the conventional magnetorheological damper, forming an additional nested chamber between the inner sleeve and the outer sleeve, so that the magnetorheological fluid flows between the inner and outer sleeves, preventing empty space in the working chamber and effectively realizing the volume compensation function.

[0016] (2) A permanent magnet is arranged at the right end of the piston head. The axially distributed magnetic field force impacts the magnetic fluid particles that have settled at the bottom, which can effectively prevent the magnetic rheological fluid from settling. This makes the magnetic rheological damper of this invention have a longer service life and ensures the stable performance of the magnetic rheological damper under long-term use.

[0017] (3) This utility model does not require the installation of a floating piston, which saves the working space of the magnetorheological damper and makes the structure more compact. At the same time, the additional nested chamber reduces the flow rate through the channel per unit time, enhances the resistance of the magnetorheological fluid through the channel, and provides a stronger damping effect. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the structure of Embodiment 1 of this utility model;

[0019] Figure 2This is a left view of the left end cap of the piston head in Embodiment 1 of this utility model;

[0020] Figure 3 This is a cross-sectional view of the first magnetorheological fluid channel of the inner sleeve in Embodiment 1 of this utility model.

[0021] In the diagram: 1. Left lifting lug; 2. Piston rod; 3. Left end cap; 4. Outer sleeve; 5. Left end cap of piston head; 6. Inner sleeve; 7. Excitation coil; 8. Right end cap of piston head; 9. Nut; 10. First magnetorheological fluid channel; 11. Right lifting lug; 12. Right end cap; 13. Screw I; 14. Chamber II; 15. Permanent magnet; 16. Screw II; 17. Piston head; 18. Screw III; 19. Chamber I; 20. Chamber III; 21. Screw IV; 22. Second magnetorheological fluid channel; 23. Wire hole. Detailed Implementation

[0022] To further illustrate the technical means and effects adopted by this utility model in order to achieve the intended utility model purpose, the following detailed description of the specific implementation methods, structure, features and effects of this utility model is provided in conjunction with the accompanying drawings and preferred embodiments.

[0023] Example 1:

[0024] This embodiment provides a magnetorheological damper with an additional nested chamber, such as... Figure 1As shown, the assembly includes a left lifting lug 1, a piston rod 2, a left end cap 3, an outer sleeve 4, a piston head left end cap 5, an inner sleeve 6, an excitation coil 7, a piston head right end cap 8, a nut 9, a first magnetorheological fluid channel 10, a right lifting lug 11, a right end cap 12, a screw I 13, a chamber II 14, a permanent magnet 15, a screw II 16, a piston head 17, a screw III 18, a chamber I 19, a chamber III 20, and a screw IV 21. The left lifting lug 1 is fixedly connected to the piston rod 2. The piston rod 2 passes through the left end cap 3 and has a clearance fit with the left end cap 3. The lower end of the piston rod 2 is machined with an external thread, and the piston head 17 is machined with an internal thread. The piston head 17 is threadedly fastened to the external thread of the piston rod 2 through the machined internal thread. The left end cap 3 is fixedly connected to the outer sleeve 4 by screw IV 21, and the left end cap 3 is fixedly connected to the inner sleeve 6 by a groove. The left end cap 5 of the piston head is fixedly connected to the piston head 17 by screw III 18. An annular groove is machined on the inner side of the piston head 17, and the excitation coil 7 is placed in the annular groove. The right end cap 8 of the piston head is fixedly connected to the piston head 17 by screw II 16 and nut 9. The permanent magnet 15 is placed on the right side of the right end cap 8 of the piston head by welding, bonding, or other methods. The lower end of the inner sleeve 6 is machined with a first magnetorheological fluid channel 10, and the inner sleeve 6 is fixedly connected to the right end cap 12 by a groove. The outer sleeve 4 is fixedly connected to the right end cap 12 by screw I 13, and the right lifting lug 11 is fixedly connected to the right end cap 12. The left end cap 5, piston head 17, and right end cap 8 of the piston head are made of low-carbon steel magnetic material, while the remaining parts are made of non-magnetic material.

[0025] The left end cap 3, the left end cap 5 of the piston head, and the inner sleeve 6 form a chamber I19. The right end cap 8 of the piston head, the inner sleeve 6, and the right end cap 12 form a chamber II14. The outer sleeve 4 and the inner sleeve 6 form a chamber III20. All chambers I19, II14, and III20 are filled with magnetorheological fluid.

[0026] The piston head 17 is provided with a second magnetorheological fluid channel 22, which passes through the left end cover 5 and the right end cover 8 of the piston head. The two ends of the second magnetorheological fluid channel 22 are connected to chamber I19 and chamber II14 respectively. The two ends of the first magnetorheological fluid channel 10 are connected to chamber III20 and chamber II14 respectively.

[0027] like Figure 2As shown, the second magnetorheological fluid channel 22 is a damping gap providing the magnetorheological fluid channel. The magnetorheological fluid flows between chamber I19 and chamber II14 through the damping gap. The excitation coil 7 is installed near the second magnetorheological fluid channel 22. By applying current to the excitation coil 7, a magnetic field is generated that acts on the magnetorheological fluid flowing through the damping gap, thereby providing a controllable damping force. The left end cover 5 of the piston head is provided with a wire hole 23, through which the wire of the excitation coil 7 is connected to an external power supply or control signal. The left end cover 5 of the piston head is machined with four circumferentially evenly distributed threaded holes for connecting screw III18 to the piston head 17.

[0028] In this embodiment, twelve second magnetorheological fluid channels 22 are provided, with three channels forming a group. The four groups of second magnetorheological fluid channels 22 are evenly distributed around the piston head 17. The three second magnetorheological fluid channels 22 in each group are arranged sequentially along the radial direction of the piston head 17. The cross-section of the second magnetorheological fluid channel 22 is arc-shaped.

[0029] like Figure 3 As shown, the lower end of the inner sleeve 6 is machined with four circumferentially evenly distributed first magnetorheological fluid channels 10, allowing the magnetorheological fluid to flow between the inner sleeve 6 and the outer sleeve 4. In this embodiment, the lower end of the inner sleeve 6 is machined with three sets of first magnetorheological fluid channels 10, realizing the flow compensation function of the magnetorheological damper of this utility model.

[0030] During operation, when the piston rod 2 is stretched axially, the magnetorheological fluid in chamber I19 enters chamber II14 through the second magnetorheological fluid channel 22. When the piston rod 2 is compressed axially, the magnetorheological fluid in chamber II14 enters chamber I19 through the second magnetorheological fluid channel 22. During this process, the yield stress of the magnetorheological fluid at the damping gap can be changed by adjusting the current in the excitation coil 7, achieving the required controllable output damping force. When the piston rod 2 moves axially, the volumes of chambers I19 and II14 change accordingly. At this time, chamber III20 achieves volume compensation through the magnetorheological fluid flow in the first magnetorheological fluid channel 10, preventing the magnetorheological damper from idling. Simultaneously, chamber III20 increases the resistance of the magnetorheological fluid flowing through the channel, providing a stronger damping effect.

[0031] When the piston rod 2 is compressed, the permanent magnet 15 arranged at the right end of the piston head 17 generates an axially distributed magnetic field force. During the compression process, it continuously impacts the magnetorheological fluid particles that have settled at the bottom, keeping the magnetorheological fluid particles in a good suspended state. This effectively prevents the magnetorheological fluid from settling and ensures the stable performance of the magnetorheological damper under long-term use.

[0032] The above description is merely a preferred embodiment of the present utility model and is not intended to limit the present utility model in any way. Although the present utility model has been disclosed above with reference to a preferred embodiment, it is not intended to limit the present utility model. Any person skilled in the art can make some modifications or alterations to the above-disclosed technical content to create equivalent embodiments without departing from the scope of the present utility model. Any simple modifications, equivalent changes and alterations made to the above embodiments based on the technical essence of the present utility model without departing from the scope of the present utility model shall still fall within the scope of the present utility model.

Claims

1. A magnetorheological damper with an additional nested chamber, characterized in that, The system includes a piston rod (2), a left end cap (3), an outer sleeve (4), a piston head assembly, an inner sleeve (6), and a right end cap (12). The inner sleeve (6) has at least one first magnetorheological fluid channel (10), and the piston head assembly has at least one axially distributed second magnetorheological fluid channel (22). The two ends of the inner sleeve (6) are connected to the left end cap (3) and the right end cap (12), respectively. The outer sleeve (4) is fitted outside the inner sleeve (6), and the two ends of the outer sleeve (4) are connected to the left end cap (3) and the right end cap (12), respectively. 4) A chamber Ⅲ (20) is formed between the inner sleeve (6) and the piston head assembly. The piston head assembly is mounted on the inner sleeve (6). The piston head assembly has chamber I (19) and chamber II (14) on both sides respectively. The two ends of the second magnetorheological fluid channel (22) are connected to chamber I (19) and chamber II (14) respectively. The piston rod (2) is mounted on the left end cap (3). The piston rod (2) is located on one side of the inner sleeve (6) and connected to the piston head assembly. The two ends of the first magnetorheological fluid channel (10) are connected to chamber Ⅲ (20) and chamber II (14) respectively.

2. The magnetorheological damper with an additional nested chamber according to claim 1, characterized in that: The left end cap (3) forms a chamber I (19) between itself and the piston head assembly, and the right end cap (12) forms a chamber II (14) between itself and the piston head assembly.

3. A magnetorheological damper with an additional nested chamber according to claim 1, characterized in that: The piston head assembly includes a piston head (17) and an excitation coil (7), with the excitation coil (7) sleeved on the piston head (17) and the piston head (17) connected to the piston rod (2).

4. A magnetorheological damper with an additional nested chamber according to claim 3, characterized in that: The piston head (17) is provided with a permanent magnet (15) at the end away from the piston rod (2).

5. A magnetorheological damper with an additional nested chamber according to claim 3, characterized in that: The piston head assembly includes a left end cap (5) and a right end cap (8) of the piston head, with both ends of the piston head (17) connected to the left end cap (5) and the right end cap (8) of the piston head, respectively.

6. A magnetorheological damper with an additional nested chamber according to claim 1, characterized in that: The first magnetorheological fluid channel (10) is provided with twelve channels, three channels in each group, and four groups of first magnetorheological fluid channels (10) are evenly distributed in the circumferential direction of the inner sleeve (6). The three first magnetorheological fluid channels (10) in each group are arranged sequentially along the axial direction of the inner sleeve (6).

7. A magnetorheological damper with an additional nested chamber according to claim 1, characterized in that: The second magnetorheological fluid channel (22) is provided with twelve channels, three channels in each group, and four groups of second magnetorheological fluid channels (22) are evenly distributed in the circumferential direction of the piston head (17). The three second magnetorheological fluid channels (22) in each group are arranged in sequence along the radial direction of the piston head (17).

8. A magnetorheological damper with an additional nested chamber according to claim 7, characterized in that: The cross-section of the second magnetorheological fluid channel (22) is arc-shaped.

9. A magnetorheological damper with an additional nested chamber according to claim 1, characterized in that: The piston rod (2) has a left lifting lug (1) at the end away from the inner sleeve (6), and the left lifting lug (1) is connected to the piston rod (2); the right end cap (12) has a right lifting lug (11) at the end away from the inner sleeve (6), and the right lifting lug (11) is connected to the right end cap (12).

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