CN219809340U - Rotary magneto-rheological damper - Google Patents
Rotary magneto-rheological damper Download PDFInfo
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- CN219809340U CN219809340U CN202321319013.6U CN202321319013U CN219809340U CN 219809340 U CN219809340 U CN 219809340U CN 202321319013 U CN202321319013 U CN 202321319013U CN 219809340 U CN219809340 U CN 219809340U
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- needle roller
- end cover
- rotary
- magnetorheological
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- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical group [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims abstract description 69
- 239000012530 fluid Substances 0.000 claims abstract description 44
- 238000013016 damping Methods 0.000 claims abstract description 20
- 238000010008 shearing Methods 0.000 claims abstract description 13
- 230000002708 enhancing effect Effects 0.000 claims abstract description 8
- 230000000694 effects Effects 0.000 claims abstract description 7
- 230000005284 excitation Effects 0.000 claims abstract description 5
- 238000007789 sealing Methods 0.000 claims description 12
- 230000006698 induction Effects 0.000 claims description 6
- 230000009471 action Effects 0.000 claims description 5
- 230000002457 bidirectional effect Effects 0.000 claims description 3
- 238000006073 displacement reaction Methods 0.000 claims description 3
- 230000000149 penetrating effect Effects 0.000 claims description 3
- 230000010354 integration Effects 0.000 abstract description 3
- 238000004804 winding Methods 0.000 abstract 1
- 238000005096 rolling process Methods 0.000 description 13
- 238000010586 diagram Methods 0.000 description 4
- 230000033001 locomotion Effects 0.000 description 4
- 238000002955 isolation Methods 0.000 description 3
- 239000002245 particle Substances 0.000 description 3
- 230000005540 biological transmission Effects 0.000 description 2
- 238000001125 extrusion Methods 0.000 description 2
- 230000009467 reduction Effects 0.000 description 2
- 230000004044 response Effects 0.000 description 2
- 239000000725 suspension Substances 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000005265 energy consumption Methods 0.000 description 1
- 238000002474 experimental method Methods 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 230000007246 mechanism Effects 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 238000004088 simulation Methods 0.000 description 1
- 230000006641 stabilisation Effects 0.000 description 1
- 238000011105 stabilization Methods 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
- 230000007704 transition Effects 0.000 description 1
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- Fluid-Damping Devices (AREA)
Abstract
The utility model provides a rotary magnetorheological damper which comprises an iron core, a cylinder barrel, a left end cover and a right end cover, wherein the cylinder barrel is coaxially arranged with the iron core; the cylinder barrel, the left end cover and the right end cover are connected to form a cylinder body, and a gap between the cylinder body and the iron core forms a seal filled with magnetorheological fluid; a wire slot for winding an exciting coil is formed in the outer surface of the iron core along the radial direction, and the exciting coil is used for generating an exciting magnetic field in a working area after being electrified; the cylinder body is internally provided with a needle roller assembly for enhancing the magnetorheological effect, the needle roller assembly comprises a needle roller matched with the iron core, and the iron core drives the needle roller to rotate when being driven to rotate and generates damping torque with the enhancing effect when an excitation magnetic field is used for shearing magnetorheological fluid; the utility model has simple structure, high output torque density and high integration with the driving element, and can be used as an independent brake or a torsion damper.
Description
Technical Field
The utility model relates to the field of mechanical vibration reduction, in particular to a rotary magneto-rheological damper.
Background
In order to meet the requirements of different damping/vibration isolation working conditions, semi-active dampers with damping controllable characteristics are gradually researched and applied, and the common semi-active dampers are linear magneto-rheological fluid dampers. Considering the working mode and the motion characteristic of magnetorheological fluid, the working mode and the motion characteristic of the magnetorheological fluid are sometimes limited by application space, so that a linear damper meeting the requirements is difficult to design, the rotary magnetorheological damper is compact in structure and easy to integrate with a self-sensing self-power supply module, the rotary magnetorheological damper can be used as a scheme of a magnetorheological energy consumption device, and in recent years, the rotary magnetorheological damper is studied and applied in some traditional vibration reduction/isolation fields, such as the field of vibration isolation of a magnetorheological seat suspension.
At present, the rotary magnetorheological damper on the market is generally based on a shearing working mode of magnetorheological fluid, the output efficiency of the shearing working mode is lower, in order to improve the output torque density, only the working area is increased, such as a multi-disk type or multi-ring type cylinder is adopted, but the output damping torque density is still smaller, and at the moment, the rotary magnetorheological damper is complex in structure and difficult to apply.
Aiming at the problems of complex mechanism, large volume, low output efficiency, poor universality and the like of the conventional rotary magnetorheological damper, the shearing working mode of magnetorheological fluid in the conventional rotary magnetorheological damper needs to be improved.
Disclosure of Invention
In view of the above, the utility model provides a new working principle-based rotary magnetorheological damper structure to realize the proposal, and rolling needle rollers are embedded between shearing working surfaces, so that a sliding interface is induced to be a thicker magnetorheological fluid particle chain under an excitation magnetic field, thereby improving boundary sliding conditions and greatly improving output torque.
The utility model can be realized by the following technical scheme aiming at the problem:
a rotary magnetorheological damper comprises an iron core capable of rotating around an axis of the damper, a cylinder barrel coaxially arranged with the iron core, a left end cover fixedly connected with the left end of the cylinder barrel and a right end cover fixedly connected with the right end of the cylinder barrel; the iron core is used as a power input end to be connected with an external motor output end, and the right end cover is used as a power output end to be connected with an external load; the cylinder barrel, the left end cover and the right end cover are connected to form a cylinder body, a gap between the cylinder body and the iron core forms a closed cavity, and magnetorheological fluid is filled in the closed cavity; the outer surface of the iron core, which is positioned in the closed cavity, is provided with a wire slot along the radial direction, an exciting coil is wound in the wire slot, and the exciting coil is used for generating an exciting magnetic field in a working area after being electrified; the cylinder body is internally provided with a needle roller assembly for enhancing the magnetorheological effect, the needle roller assembly comprises a needle roller matched with the iron core, and the needle roller is driven to rotate when the iron core is driven to rotate under the action of an excitation magnetic field so as to shear magnetorheological fluid to generate damping torque with the enhancing effect.
Further, the needle roller assembly further comprises a needle roller retainer for fixing the needle roller, the needle roller retainer is cylindrical, strip-shaped holes for fixing the needle roller are formed in the axial direction of the needle roller retainer, and the strip-shaped holes are uniformly distributed on the side wall of the needle roller retainer.
Further, the device also comprises a sleeve for fixing the needle roller retainer, the sleeve is in interference fit with the cylinder barrel, torque generated by shearing the magnetorheological fluid by the needle roller and the iron core is transmitted to the cylinder barrel through the sleeve, and the cylinder barrel is driven to rotate and then outputs the torque to an external load through the right end cover.
Further, the left end of sleeve is provided with holding ring I, the right-hand member of sleeve is provided with holding ring II, the sleeve passes through holding ring I and holding ring II and is located in the inner shaft of closed chamber.
Further, a lead channel is further arranged on the iron core, the lead channel is used for leading out a wiring end of the exciting coil and enabling the wiring end to be connected with an external power supply, and the external power supply controls the magnetic induction intensity of the exciting magnetic field by changing the exciting current flowing through the exciting coil.
Further, sealing elements I are respectively arranged between the left end cover and the cylinder barrel and between the right end cover and the cylinder barrel, and the sealing elements I are used for preventing magnetorheological fluid in the closed cavity from flowing out of the cylinder body.
Further, the outer surface of the left end cover is outwards protruded to form a protruding part, and a rotary bearing I is arranged between the left end cover and the iron core in the protruding part; the inner surface of the right end cover is inwards recessed to form a groove part, and a rotating bearing II is arranged between the right end cover and the iron core in the groove part.
Further, the rolling bearing I is used for supporting the front end of the iron core in the radial direction, the rolling bearing II is used for fixing the rear end of the iron core, and the iron core is fixed in a bidirectional mode through the rolling bearing I and the rolling bearing II and axial positioning of the iron core is achieved.
Further, the front end of the rotary bearing I is provided with a limiting component, and the limiting component is used for limiting the axial displacement of the rotary bearing I on the iron core; and a sealing piece II is arranged between the rotating bearing II and the closed cavity and is used for preventing magnetorheological fluid in the closed cavity from penetrating into the rotating bearing II.
The beneficial effects of the utility model are as follows:
the rotary magnetorheological damper provided by the technical scheme can ensure accurate torque output by controlling exciting current, has high torque adjustment response speed, and can be suitable for different braking and force transmission occasions; meanwhile, the rotary magnetorheological damper is simple in structure, high in output torque density and easy to form high integration with a driving element.
Drawings
The utility model is further described below with reference to the drawings and embodiments.
FIG. 1 is a schematic diagram of a rotary magnetorheological damper of the present utility model;
FIG. 2 is a cross-sectional view A-A of FIG. 1;
FIG. 3 is a schematic view of the structure of the needle roller cage of the present utility model;
FIG. 4 is a schematic diagram of a magnetic circuit in the present utility model;
FIG. 5 is a schematic diagram of a magnetorheological fluid chain at a conventional flow channel;
FIG. 6 is a schematic diagram showing the chain formation of magnetorheological fluid at the flow channel after the needle roller is introduced;
FIG. 7 is a graph of experimental mechanical properties of the present utility model;
FIG. 8 is a graph of simulated mechanical properties without consideration of the induction enhancement effect of the needle roller structure in the present utility model;
wherein the reference numerals are as follows: 1-a left end cover; 2-positioning ring I; 3-cylinder barrel; 4-rolling needles; 5-right end cover, 6-deep groove ball bearing I; 7-seal ii; 8-positioning ring II; 9-coil; 10-deep groove ball bearings II; 11-a bearing retainer ring; 12-stop nut; 13-iron core; 14-magnetorheological fluid; 15-a needle roller retainer; 16-a needle roller sleeve; 17-seal i.
Detailed Description
As shown in the figure, the rotary magnetorheological damper provided by the utility model comprises an iron core 13 capable of rotating around the axis of the iron core, a cylinder barrel 3 coaxially arranged with the iron core 13, a left end cover 1 fixedly connected with the left end of the cylinder barrel 3 and a right end cover 5 fixedly connected with the right end of the cylinder barrel 3; the iron core 13 is used as a power input end to be connected with an external motor output end, and the right end cover 5 is used as a power output end to be connected with an external load; the cylinder barrel 3, the left end cover 1 and the right end cover 5 are connected and fixed to form a cylinder body, a gap between the cylinder body and the iron core 13 forms a closed cavity, and magnetorheological fluid 14 is filled in the closed cavity; a wire slot is radially formed in the outer surface of the iron core 13 positioned in the closed cavity, an exciting coil 9 is wound in the wire slot, and the exciting coil 9 is used for generating an exciting magnetic field in a working area after being electrified; the inner wall of the cylinder body is provided with a needle roller assembly for enhancing the magnetorheological effect, the needle roller assembly comprises a needle roller 4 matched with the iron core 13, and the iron core 13 is driven to rotate to drive the needle roller 4 to rotate so as to shear the magnetorheological fluid 14 to generate damping torque with the enhancing effect; in the technical scheme, a rolling needle roller assembly is embedded in a closed cavity in the rotary magnetorheological damper, a needle roller 4 is driven by an iron core 13 to rotate to shear magnetorheological fluid so as to generate damping force, the damping force is transmitted to a cylinder body, and torque is output to an external load through a right end cover 5 on the right side of the cylinder body;
in the embodiment, the cylinder barrel 3, the left end cover 1 and the right end cover 5 which are coaxially arranged with the iron core 13 form a cylinder body structure of the magnetorheological damper, and meanwhile, the cylinder barrel 3, the left end cover 1 and the right end cover 5 are fixedly connected through bolts; the gap between the cylinder body structure and the iron core 13 forms a closed cavity filled with magnetorheological fluid, wherein the magnetorheological fluid in the closed cavity can flow together when the iron core 13 rotates so as to realize the movement of microscopic particles in the magnetorheological fluid; after the needle roller structure is introduced, the rolling action of the needle roller structure in the closed cavity is utilized to generate extrusion force on the magnetorheological fluid along the normal direction of the outer surface of the needle roller, so that the microscopic chain structure of the magnetorheological fluid is induced to form a robustly chain; the exciting coil 9 is wound on the iron core 13, so that an exciting magnetic field is formed at the working shearing position of the iron core 13 and the needle roller 4 in the closed cavity, the needle roller 4 is induced to be a thicker magnetorheological fluid particle chain at a sliding interface, the boundary sliding condition is improved, and the output damping torque is greatly improved; the thick and strong chain formed by the induction of the needle roller structure has better shearing resistance, improves the mechanical property of the damper, and has the advantages of high output damping torque density and high integration level with a driving element.
In this embodiment, the needle roller assembly further includes a needle roller holder 15 for fixing a needle roller, where the needle roller holder 15 is cylindrical and has a strip hole along an axial direction for fixing the needle roller 4, and a plurality of strip holes are uniformly distributed on a side wall of the needle roller holder 15; the roller pin retainer 15 is a cylindrical metal structural member with certain corrosion and wear resistance, is arranged in a closed cavity filled with magnetorheological fluid, is similar to a retainer in a conventional bearing structure, and is mainly used for fixing the roller pin 4 and keeping transition fit between the roller pin 4 and the iron core 13, so that the roller pin 4 can be driven to rotate to shear the magnetorheological fluid 14 to generate torque when the iron core 13 rotates.
In this embodiment, the device further includes a sleeve 16 for fixing the needle roller retainer 15, the sleeve 16 is in interference fit with the cylinder barrel 3, torque generated by shearing the magnetorheological fluid 14 by the needle roller 4 and the iron core 13 is transmitted to the cylinder barrel 3 through the sleeve 16, and the cylinder barrel 3 is driven to rotate and then outputs the torque to an external load through the right end cover 5; the sleeve 16 is mainly used for fixing the needle roller retainer 15, the needle roller 4 and the needle roller retainer 15 are firstly installed during installation, and then the sleeve 16 is installed to wrap and fix the needle roller structure; through the interference fit between sleeve 16 and cylinder 3, make iron core 13 rotate the time drive kingpin 4 rotate with shearing the damping torque force that magnetorheological suspensions 14 produced can transmit to cylinder 3, and then drive the cylinder body and rotate together to output torque gives external load through right-hand member lid 5, realize the output of moment of torsion.
In this embodiment, a positioning ring i 2 is disposed at the left end of the sleeve 16, a positioning ring ii 8 is disposed at the right end of the sleeve, and the sleeve 16 is axially positioned in the closed cavity through the positioning ring i 2 and the positioning ring ii 8; the positioning ring i 2 is disposed between the left end of the sleeve 16 and the left end cover 1, the positioning ring ii 8 is disposed between the right end of the sleeve 16 and the right end cover 5, and the positioning ring i 2 and the positioning ring ii 8 are annular structural members and are in interference fit with the sleeve 16, which belongs to the prior art and is not described herein; through setting up holding ring I2 and holding ring II 8 in the axial both sides of sleeve 16, realized the axial positioning of sleeve 16 in the closed chamber, further promoted this attenuator job stabilization nature.
In this embodiment, the iron core 13 is further provided with a lead channel, and the lead channel is used for leading out a terminal of the exciting coil 9 and connecting the terminal with an external power supply, and the external power supply controls the magnetic induction intensity of the exciting magnetic field by changing the exciting current flowing through the exciting coil 9; the magnetorheological damper controls the output torque by controlling the exciting current, so that the accurate torque output is ensured, and meanwhile, the damper is high in torque adjustment response speed and can be suitable for different braking and force transmission occasions.
In this embodiment, a sealing member i 17 is disposed between the left end cover 1 and the cylinder 3 and between the right end cover 5 and the cylinder 3, where the sealing member i 17 is used to prevent magnetorheological fluid 14 in the closed cavity from flowing out of the cylinder; the sealing element I17 is a sealing rubber ring, belongs to the prior art and is not described in detail herein; through set up sealed rubber ring respectively between left end cover 1 and cylinder 3 and right-hand member lid 5 and cylinder 3, can effectively prevent to seal the magnetorheological fluid in the intracavity and reveal simultaneously guarantee that the work shear plane of kingpin 4 and iron core 13 is full of magnetorheological fluid all the time.
In this embodiment, the outer surface of the left end cover 1 protrudes outwards to form a protruding portion, and the left end cover 1 and the iron core 13 are provided with a rotating bearing i 10 in the protruding portion; the inner surface of the right end cover 5 is inwards recessed to form a groove part, and a rotary bearing II 6 is arranged in the groove part between the right end cover 5 and the iron core 13; the outer surface of the left end cover 1 is the other surface facing the side surface of the closed cavity, an annular bulge part is formed by outwards bulge, a rotary bearing I10 is arranged in the annular bulge part, and the rotary bearing I10 is used for supporting the front end of the iron core 13 in the radial direction; the inner surface of the right end cover 5 is a surface facing the closed cavity side, a groove part is formed by inwards sinking, a rotary bearing II 6 is arranged in the groove part, and the rotary bearing II 6 is used for fixing the rear end of the iron core 13; the iron core 13 is fixed in a bidirectional manner through the rotating bearing I10 and the rotating bearing II 6, the axial positioning of the iron core 13 is realized, and the stability of the iron core 13 in the rotating process is ensured.
In the embodiment, a limiting component is arranged at the front end of the rotary bearing I10 and is used for limiting the axial displacement of the rotary bearing I10 on the iron core 13; a sealing element II 7 is arranged between the rotary bearing II 6 and the closed cavity, and the sealing element II 7 is used for preventing magnetorheological fluid 14 in the closed cavity from penetrating into the rotary bearing II 6.
Referring to fig. 4 and 5, when the exciting coil in the damper is energized, the magnetorheological fluid in the closed cavity is excited to form a microscopic chain along the magnetic field direction, so that yield stress is generated to prevent the relative movement between the upper wall surface and the lower wall surface, and a damping effect is generated; with reference to fig. 6, a rolling action of the rolling needle 4 between the closed cavity and the outer wall of the iron core 13 is utilized to generate extrusion force to the magnetorheological fluid 14 along the normal direction of the outer surface of the rolling needle by introducing the rolling needle structure into the magnetorheological fluid closed cavity, so that the microscopic chain structure of the magnetorheological fluid is induced to form a robustly chain; the thick chain formed by the induction of the structure has better shearing resistance, and the mechanical property of the damper is improved.
As shown in fig. 7, the torsion test of sinusoidal excitation is performed on the processed rotary magnetorheological damper, so that the zero-field damping torque of the damper is about 1.1n·m when the damper is not electrified (0A); when the pair is blockedWhen exciting current is introduced into the damper, the output torque of the damper is greatly improved, and in a certain range, the damping torque performance is improved along with the increase of the current; when the input current is 1.0A, the torque density of the damper is about 74.15 kN.m -2 。
Referring to fig. 8, when the magnetorheological fluid 14 is not considered to be enhanced by the rolling action between the needle roller 4 and the outer wall of the iron core 13 in the closed cavity to induce the magnetorheological fluid to be enhanced, compared with the damping torque obtained by experiments, the simulation value of the damping torque generated by the damper has a larger gap; the introduced needle roller structure has a good improvement effect on the mechanical property of the damper, and particularly when the rotation speed of the damper is low, the damping torque can be greatly improved.
Finally, it is noted that the above embodiments are only for illustrating the technical solution of the present utility model and not for limiting the same, and although the present utility model has been described in detail with reference to the preferred embodiments, it should be understood by those skilled in the art that modifications and equivalents may be made thereto without departing from the spirit and scope of the technical solution of the present utility model, which is intended to be covered by the scope of the claims of the present utility model.
Claims (9)
1. A rotary magnetorheological damper, characterized by: the device comprises an iron core capable of rotating around the axis of the device, a cylinder barrel coaxially arranged with the iron core, a left end cover fixedly connected with the left end of the cylinder barrel and a right end cover fixedly connected with the right end of the cylinder barrel; the iron core is used as a power input end to be connected with an external motor output end, and the right end cover is used as a power output end to be connected with an external load; the cylinder barrel, the left end cover and the right end cover are connected to form a cylinder body, a gap between the cylinder body and the iron core forms a closed cavity, and magnetorheological fluid is filled in the closed cavity; the outer surface of the iron core, which is positioned in the closed cavity, is provided with a wire slot along the radial direction, an exciting coil is wound in the wire slot, and the exciting coil is used for generating an exciting magnetic field in a working area after being electrified; the cylinder body is internally provided with a needle roller assembly for enhancing the magnetorheological effect, the needle roller assembly comprises a needle roller matched with the iron core, and the needle roller is driven to rotate when the iron core is driven to rotate under the action of an excitation magnetic field so as to shear magnetorheological fluid to generate damping torque with the enhancing effect.
2. The rotary magnetorheological damper of claim 1, wherein: the needle roller assembly further comprises a needle roller retainer for fixing the needle roller, the needle roller retainer is cylindrical, strip-shaped holes for fixing the needle roller are formed in the axial direction of the needle roller retainer, and the strip-shaped holes are uniformly distributed on the side wall of the needle roller retainer.
3. The rotary magnetorheological damper of claim 2, wherein: the roller pin and iron core shearing magnetorheological fluid damping device is characterized by further comprising a sleeve used for fixing the roller pin retainer, the sleeve is in interference fit with the cylinder barrel, damping torque generated by the roller pin and the iron core shearing magnetorheological fluid is transmitted to the cylinder barrel through the sleeve, and the cylinder barrel is driven to rotate and then outputs the torque to an external load through the right end cover.
4. The rotary magnetorheological damper of claim 3, wherein: the left end of the sleeve is provided with a locating ring I, the right end of the sleeve is provided with a locating ring II, and the sleeve is axially located in the closed cavity through the locating ring I and the locating ring II.
5. The rotary magnetorheological damper of claim 2, wherein: the iron core is also provided with a lead channel, the lead channel is used for leading out a wiring end of the exciting coil and connecting the wiring end with an external power supply, and the external power supply controls the magnetic induction intensity of the exciting magnetic field by changing the exciting current flowing through the exciting coil.
6. The rotary magnetorheological damper of claim 2, wherein: and sealing elements I are respectively arranged between the left end cover and the cylinder barrel and between the right end cover and the cylinder barrel, and the sealing elements I are used for preventing magnetorheological fluid in the closed cavity from flowing out of the cylinder body.
7. The rotary magnetorheological damper of claim 6, wherein: the outer surface of the left end cover is outwards protruded to form a protruding part, and a rotary bearing I is arranged between the left end cover and the iron core in the protruding part; the inner surface of the right end cover is inwards recessed to form a groove part, and a rotating bearing II is arranged between the right end cover and the iron core in the groove part.
8. The rotary magnetorheological damper of claim 7, wherein: the rotary bearing I is used for supporting the front end of the iron core in the radial direction, the rotary bearing II is used for fixing the rear end of the iron core, and the iron core is fixed in a bidirectional manner through the rotary bearing I and the rotary bearing II and realizes the axial positioning of the iron core.
9. The rotary magnetorheological damper of claim 8, wherein: the front end of the rotary bearing I is provided with a limiting assembly, and the limiting assembly is used for limiting the axial displacement of the rotary bearing I on the iron core; and a sealing piece II is arranged between the rotating bearing II and the closed cavity and is used for preventing magnetorheological fluid in the closed cavity from penetrating into the rotating bearing II.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202321319013.6U CN219809340U (en) | 2023-05-26 | 2023-05-26 | Rotary magneto-rheological damper |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202321319013.6U CN219809340U (en) | 2023-05-26 | 2023-05-26 | Rotary magneto-rheological damper |
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| Publication Number | Publication Date |
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| CN219809340U true CN219809340U (en) | 2023-10-10 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202321319013.6U Active CN219809340U (en) | 2023-05-26 | 2023-05-26 | Rotary magneto-rheological damper |
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| Country | Link |
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| CN (1) | CN219809340U (en) |
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2023
- 2023-05-26 CN CN202321319013.6U patent/CN219809340U/en active Active
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