CN110864068B - Multi-magnetic circuit magneto-rheological damper with permanent magnets - Google Patents
Multi-magnetic circuit magneto-rheological damper with permanent magnets Download PDFInfo
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- CN110864068B CN110864068B CN201911146531.0A CN201911146531A CN110864068B CN 110864068 B CN110864068 B CN 110864068B CN 201911146531 A CN201911146531 A CN 201911146531A CN 110864068 B CN110864068 B CN 110864068B
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- cylinder body
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- permanent magnets
- piston rod
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16F—SPRINGS; SHOCK-ABSORBERS; MEANS FOR DAMPING VIBRATION
- F16F9/00—Springs, vibration-dampers, shock-absorbers, or similarly-constructed movement-dampers using a fluid or the equivalent as damping medium
- F16F9/32—Details
- F16F9/53—Means for adjusting damping characteristics by varying fluid viscosity, e.g. electromagnetically
- F16F9/535—Magnetorheological [MR] fluid dampers
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16F—SPRINGS; SHOCK-ABSORBERS; MEANS FOR DAMPING VIBRATION
- F16F9/00—Springs, vibration-dampers, shock-absorbers, or similarly-constructed movement-dampers using a fluid or the equivalent as damping medium
- F16F9/32—Details
- F16F9/3207—Constructional features
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- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
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- Electromagnetism (AREA)
- Fluid-Damping Devices (AREA)
Abstract
The invention discloses a multi-magnetic-circuit magneto-rheological damper with permanent magnets, which comprises a cylinder body, a piston rod, a magnetic core, magneto-rheological fluid, a coil, a magnetizer and permanent magnets, wherein the piston rod is arranged on the cylinder body; according to the invention, the coil is arranged outside the cylinder body, so that the coil is convenient to mount and dismount during daily maintenance, and meanwhile, heat generated when the coil is electrified can be well dissipated, the viscosity of magnetorheological fluid is not influenced, and the service life of the damper is prolonged. Because the coil is placed outside, the internal structure of the shock absorber is simple, the manufacturing difficulty is reduced, and the manufacturing cost is saved.
Description
Technical Field
The invention relates to the field, in particular to a multi-magnetic-circuit magneto-rheological damper with a permanent magnet.
Background
The viscosity of the magnetorheological fluid can change along with the change of the intensity of the external magnetic field, and the magnetorheological fluid is rapid, reversible and controllable. The magneto-rheological shock absorber utilizes the characteristic, the output damping force of the magneto-rheological hydraulic suspension is changed by controlling the current in the excitation coil to change the magnetic field intensity, so that the vibration of the automobile is attenuated, and the process is quick in response, continuous and reversible.
A coil in the existing magnetorheological damper is mainly arranged in a groove in the circumferential direction of a piston, and a coil wire is led out of the damper through a deep hole processed in a piston rod. Although the structure of the piston is compact, the structure of the piston is too complex, the processing difficulty of the deep and long hole in the piston is large, the manufacturing cost is high, and the integral shock absorber is expensive. Meanwhile, friction can generate heat when the piston moves, and the coil is electrified to generate heat, so that the heat can not be immediately emitted in a short time to form heat accumulation, the temperature of the magnetorheological fluid is too high, the magnetorheological fluid is diluted at a high temperature, and the damping performance of the magnetorheological fluid is further reduced sharply.
And because the existing magneto-rheological shock absorber mostly adopts a single magnetic circuit, the damping force output by the shock absorber can be reduced under the condition of no energization, and when the coil fails, the shock absorber can completely lose the function. Therefore, in order to obtain a larger damping force, the length of the piston is usually increased, and then the length of the damping channel is increased to obtain a large damping force.
Therefore, in order to solve the above problems, a multi-magnetic-circuit magnetorheological damper with a permanent magnet is needed, which can well solve the heat dissipation problem of a coil, is convenient to maintain, reduces the manufacturing difficulty of the damper, and saves the cost.
Disclosure of Invention
In view of the above, the present invention aims to overcome the defects in the prior art, and provides a multi-magnetic circuit magnetorheological damper with permanent magnets, which is convenient for daily maintenance, installation and removal, and simultaneously, heat generated when a coil is energized can be well dissipated without affecting the viscosity of the magnetorheological fluid, thereby prolonging the service life of the damper.
The invention relates to a multi-magnetic-circuit magneto-rheological damper with permanent magnets, which comprises a cylinder body, a piston rod, a magnetic core, magneto-rheological fluid, a coil, a magnetizer and permanent magnets, wherein the piston rod is arranged on the cylinder body;
the cylinder body is divided into a working cavity and a compensation cavity by the inner wall, and the working cavity is communicated with the bottom of the compensation cavity;
the lower end of the piston rod is arranged in the cylinder body, the upper end of the piston rod extends out of the cylinder body along a piston hole in an upper end cover of the cylinder body, and the piston hole is connected with the piston rod in a sliding and sealing mode;
the magnetic core is fixedly arranged at the lower end of the piston rod to divide the working cavity into an upper cavity and a lower cavity, can slide up and down relative to the wall of the working cavity, and is provided with a damping channel communicated with the upper cavity and the lower cavity;
magnetorheological fluid filling the working cavity;
a coil slidably wound around an outer surface of the cylinder,
the magnetizer is in a ring shape with a U-shaped cross section, is buckled on the surface of the coil and is sleeved on the outer surface of the cylinder body along with the coil in a synchronous sliding manner, the magnetizer is fixedly connected with the upper end of the piston rod through a shell, and the height of the magnetic core is consistent with that of the magnetizer and the coil;
and the permanent magnet comprises an upper permanent magnet and a lower permanent magnet, and the upper permanent magnet and the lower permanent magnet are fixedly locked on the magnetic core.
Further, the inner wall is a cylindrical wall concentric with the outer wall of the cylinder body, the compensation cavity is an inner cavity in a circular ring shape, and the working cavity is communicated with the compensation cavity through a plurality of small holes formed in the bottom of the working cavity.
Further, the compensation cavity is used for containing compensation gas and magnetorheological fluid.
Furthermore, the upper end cover is provided with a liquid injection hole for injecting magnetorheological fluid into the cylinder body, and the liquid injection hole is detachably sealed by a screw.
Furthermore, the upper end cover is provided with an exhaust hole for exhausting gas in the cylinder body, and the exhaust hole is detachably sealed by a screw.
Furthermore, the upper end face and the lower end face of the magnetic core are both fixedly provided with magnetic isolation plates matched with the magnetic core in shape.
Furthermore, the magnetizer outer surface cover is arranged in a magnetism isolating shell, and the magnetism isolating shell is fixedly connected with the shell and can slide relative to the outer surface of the cylinder body.
Further, the damping channel is an annular circuitous channel.
Further, an inertia channel is arranged between the magnetic core and the wall of the working cavity.
Further, the upper end of the piston rod and the lower end of the cylinder body are both provided with lifting lugs convenient to install.
The invention has the beneficial effects that: according to the multi-magnetic-circuit magnetorheological damper with the permanent magnets, the coil is arranged outside the cylinder body, so that the coil is convenient to mount and dismount during daily maintenance, heat generated when the coil is electrified can be well dissipated, the viscosity of the magnetorheological fluid is not affected, and the service life of the damper is prolonged. Because the coil is placed outside, the internal structure of the shock absorber is simple, the manufacturing difficulty is reduced, and the manufacturing cost is saved. The permanent magnet is arranged in the cylinder body, and on one hand, the permanent magnet is matched with the coil to generate a larger magnetic field for the magnetorheological fluid, so that the damping force of the shock absorber is improved, and the shock absorption performance is enhanced; on the other hand, when the coil fails, the permanent magnet can provide a magnetic field for the magnetorheological fluid continuously, so that the condition that the shock absorber fails completely is avoided, and the automobile can still safely run for a certain distance to find a maintenance point under the condition that the shock absorber does not lose basic functions.
Drawings
The invention is further described below with reference to the following figures and examples:
FIG. 1 is a schematic structural view of the present invention;
FIG. 2 is a schematic view of the magnetic circuit of the present invention;
FIG. 3 is an assembled view of the magnetic core of the present invention;
figure 4 is an exploded view of the magnetic core of the present invention.
Detailed Description
Fig. 1 is a schematic structural view of the present invention, fig. 2 is a schematic magnetic circuit view of the present invention, fig. 3 is an assembly view of a magnetic core of the present invention, fig. 4 is an exploded view of the magnetic core of the present invention, and the multi-magnetic circuit magnetorheological damper with permanent magnets in the present embodiment includes a cylinder body 1, a piston rod 2, a magnetic core 3, magnetorheological fluid, a coil 4, a magnetizer 5 and permanent magnets;
the cylinder body 1 is divided into a working cavity 11 and a compensation cavity 12 by an inner wall 1a, and the bottom of the working cavity 11 is communicated with the bottom of the compensation cavity 12;
the lower end of the piston rod 2 is arranged in the cylinder body 1, the upper end of the piston rod extends out of the cylinder body 1 along a piston hole on an upper end cover 13 of the cylinder body 1, and the piston hole is connected with the piston rod 2 in a sliding and sealing manner;
the magnetic core 3 is fixedly arranged at the lower end of the piston rod 2 to divide the working cavity 11 into an upper cavity and a lower cavity, the magnetic core 3 can slide up and down relative to the wall of the working cavity 11, and a damping channel 3a communicated with the upper cavity and the lower cavity is formed in the magnetic core 3;
magnetorheological fluid filling the working cavity 11;
a coil 4 slidably wound around an outer surface of the cylinder 1,
the magnetizer 5 is in a ring shape with a U-shaped cross section, is buckled on the surface of the coil 4 and is synchronously sleeved on the outer surface of the cylinder body 1 along with the coil 4 in a sliding manner, the magnetizer 5 is fixedly connected with the upper end of the piston rod 2 through the shell 6, the heights of the magnetic core 3, the magnetizer 5 and the coil 4 are consistent, and the magnetic core 3, the magnetizer 5 and the coil 4 are fixedly connected with the piston, so that the relative positions of the three are always kept unchanged in the up-and-down movement process of the piston, a magnetic field can be generated under the condition that the coil 4 is electrified so as to change the viscosity of the magnetorheological fluid flowing through the position of the magnetic core 3 and further change the flowing speed of the magnetorheological fluid, so that the damping force is enhanced, and the damping effect is enhanced;
the permanent magnets comprise an upper permanent magnet 61 and a lower permanent magnet 62, the upper permanent magnet 61 and the lower permanent magnet 62 are fixedly locked on the magnetic core 3, and as can be clearly seen from a magnetic circuit diagram, when no coil 4 generates a required magnetic field, the upper permanent magnet 61 and the lower permanent magnet 62 can also provide a magnetic field for the magnetorheological fluid, so that the shock absorber is prevented from being completely failed instantly, the driving safety is ensured to a greater extent, and the driving comfort is improved.
In this embodiment, inner wall 1a is the concentric cylinder wall with cylinder body 1 outer wall, compensation chamber 12 is the inner chamber of ring bodily form, working chamber 11 communicates through setting up in a plurality of apertures 1b of its bottom with compensation chamber 12, because the temperature in the cylinder body 1 can produce some changes at the bumper shock absorber during operation, because the reason of expend with heat and contract with cold, can lead to magnetorheological suspensions can't be full of working chamber 11, and magnetorheological suspensions in the compensation chamber 12 can form one to the magnetorheological suspensions in the working chamber 11 and supplement or absorb magnetorheological suspensions to ensure the stationarity of bumper shock absorber work.
In this embodiment, the compensation chamber 12 is used for containing compensation gas and magnetorheological fluid, the magnetorheological fluid is located at the lower part of the compensation chamber 12 and is communicated with the magnetorheological fluid in the working chamber 11, and the upper space of the magnetorheological fluid is filled with the compensation gas.
In this embodiment, the upper end cover 13 is provided with a liquid injection hole 14 for injecting magnetorheological fluid into the cylinder body 1, and the liquid injection hole is detachably sealed by a screw.
In this embodiment, the upper end cover 13 is provided with an exhaust hole 15 for exhausting gas in the cylinder body 1, and the exhaust hole is detachably sealed by a screw.
In this embodiment, the upper and lower end surfaces of the magnetic core 3 are both fixedly provided with the magnetic isolation plates 3c adapted to the shape thereof, so as to avoid the loss of electromagnetic energy at the magnetic core 3, and the electromagnetism is completely used for improving the viscosity of the magnetorheological fluid flowing through the damping channel 3a, improving the damping force and enhancing the damping capacity.
In this embodiment, the outer surface of the magnetizer 5 is covered in the magnetism isolating case 5a, and the magnetism isolating case 5a is fixedly connected with the outer case 6 and can slide relative to the outer surface of the cylinder body 1, so as to avoid the electromagnetic energy loss generated by the coil 4 and completely transmit the electromagnetic energy to the magnetic core 3.
In this embodiment, the damping channel 3a is an annular roundabout channel, and the long and narrow roundabout channel increases the internal resistance of the damping channel 3a while extending the channel distance, thereby increasing the damping force, enhancing the damping effect, and making the shock absorber compact in structure.
In this embodiment, an inertia channel 3b is disposed between the magnetic core 3 and the wall of the working cavity 11, and is used for the magnetorheological fluid to pass through.
In this embodiment, the upper end of the piston rod 2 and the lower end of the cylinder body 1 are both provided with lifting lugs 7 convenient to mount, so that the shock absorber can be assembled conveniently.
The invention has the following advantages: the upper permanent magnet 61 and the lower permanent magnet 62 are added, so that a larger magnetic field can be generated by matching the coil 4, the damping force of the shock absorber is increased, the shock absorber cannot be immediately incapable of working when the coil 4 fails, and a vehicle can run normally, so that the shock absorber cannot fail completely, normal running can still be guaranteed, and a driver can be guaranteed to safely drive to a maintenance place; by changing the length of the damping channel 3a, the damping force is effectively increased, the vibration isolation capability of the shock absorber is improved, and the trafficability and comfort of the automobile are improved; the compensation chamber is used for adjusting the magnetorheological fluid in the working cavity 11, and the coil 4 is arranged externally, so that the utilization rate of the internal volume of the shock absorber is improved, the structure is more compact, and the manufacturing cost is saved; the coil 4 is external, is more favorable to the heat dissipation, reduces the influence of temperature to magnetorheological suspensions, makes the performance of bumper shock absorber more stable, and when coil 4 broke down, the external maintenance of being convenient for more has reduced the trouble of dismouting, has also saved manufacturing cost simultaneously.
Finally, the above embodiments are only for illustrating the technical solutions of the present invention and not for limiting, although the present invention has been described in detail with reference to the preferred embodiments, it should be understood by those skilled in the art that modifications or equivalent substitutions may be made to the technical solutions of the present invention without departing from the spirit and scope of the technical solutions of the present invention, and all of them should be covered in the claims of the present invention.
Claims (8)
1. A multi-magnetic circuit magneto-rheological damper with permanent magnets is characterized in that: the magnetorheological fluid magnetic cylinder comprises a cylinder body, a piston rod, a magnetic core, magnetorheological fluid, a coil, a magnetizer and a permanent magnet;
the cylinder body is divided into a working cavity and a compensation cavity by the inner wall, and the working cavity is communicated with the bottom of the compensation cavity;
the lower end of the piston rod is arranged in the cylinder body, the upper end of the piston rod extends out of the cylinder body along a piston hole in an upper end cover of the cylinder body, and the piston hole is connected with the piston rod in a sliding and sealing mode;
the magnetic core is fixedly arranged at the lower end of the piston rod to divide the working cavity into an upper cavity and a lower cavity, can slide up and down relative to the wall of the working cavity, and is provided with a damping channel communicated with the upper cavity and the lower cavity;
magnetorheological fluid filling the working cavity;
a coil slidably wound around an outer surface of the cylinder,
the magnetizer is in a ring shape with a U-shaped cross section, is buckled on the surface of the coil and is sleeved on the outer surface of the cylinder body along with the coil in a synchronous sliding manner, the magnetizer is fixedly connected with the upper end of the piston rod through a shell, and the height of the magnetic core is consistent with that of the magnetizer and the coil;
the permanent magnet comprises an upper permanent magnet and a lower permanent magnet, and the upper permanent magnet and the lower permanent magnet are fixedly locked on the magnetic core;
the damping channel is an annular circuitous channel, and an inertia channel is arranged between the magnetic core and the wall of the working chamber.
2. The multi-magnetic circuit magnetorheological damper with permanent magnets of claim 1, wherein: the inner wall is a cylindrical wall concentric with the outer wall of the cylinder body, the compensation cavity is an inner cavity in the shape of a circular ring, and the working cavity is communicated with the compensation cavity through a plurality of small holes formed in the bottom of the working cavity.
3. The multi-magnetic circuit magnetorheological damper with permanent magnets of claim 2, wherein: the compensation cavity is used for containing compensation gas and magnetorheological fluid.
4. The multi-magnetic circuit magnetorheological damper with permanent magnets of claim 1, wherein: the upper end cover is provided with a liquid injection hole for injecting magnetorheological fluid into the cylinder body, and the liquid injection hole is detachably sealed by a screw.
5. The multi-magnetic circuit magnetorheological damper with permanent magnets of claim 1, wherein: the upper end cover is provided with an exhaust hole for exhausting gas in the cylinder body, and the exhaust hole is detachably sealed by a screw.
6. The multi-magnetic circuit magnetorheological damper with permanent magnets of claim 1, wherein: and the upper end surface and the lower end surface of the magnetic core are fixedly provided with magnetic isolation plates matched with the magnetic core in shape.
7. The multi-magnetic circuit magnetorheological damper with permanent magnets of claim 1, wherein: the magnetizer outer surface cover is arranged in the magnetism isolating shell, and the magnetism isolating shell is fixedly connected with the shell and can slide relative to the outer surface of the cylinder body.
8. The multi-magnetic circuit magnetorheological damper with permanent magnets of any one of claims 1 to 7, wherein: the upper end of the piston rod and the lower end of the cylinder body are both provided with lifting lugs convenient to install.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911146531.0A CN110864068B (en) | 2019-11-21 | 2019-11-21 | Multi-magnetic circuit magneto-rheological damper with permanent magnets |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201911146531.0A CN110864068B (en) | 2019-11-21 | 2019-11-21 | Multi-magnetic circuit magneto-rheological damper with permanent magnets |
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| CN110864068A CN110864068A (en) | 2020-03-06 |
| CN110864068B true CN110864068B (en) | 2021-09-14 |
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| CN114576307B (en) * | 2022-03-24 | 2023-08-25 | 枣庄天宏新材料科技有限公司 | Damping buffer device for textile machinery |
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|---|---|---|---|---|
| CN101936362A (en) * | 2010-08-23 | 2011-01-05 | 扬州市开发区三特轻工机械厂 | Shock absorber |
| JP2011166880A (en) * | 2010-02-05 | 2011-08-25 | Hitachi Automotive Systems Ltd | Linear actuator, and suspension device using the same |
| CN102913587A (en) * | 2012-10-25 | 2013-02-06 | 中国民航大学 | Magneto-rheological damper |
| CN203685963U (en) * | 2014-02-05 | 2014-07-02 | 吉林大学 | Multistage spiral magneto-rheological shock absorber piston assembly |
| CN108302149A (en) * | 2018-03-13 | 2018-07-20 | 华南理工大学 | Using external coil and the coefficient double-cylinder type magneto-rheological vibration damper of permanent magnet |
| CN108591343A (en) * | 2018-04-17 | 2018-09-28 | 安徽卓特信息技术有限公司 | A kind of externally-wound type MR damper of cylinder barrel positioning |
-
2019
- 2019-11-21 CN CN201911146531.0A patent/CN110864068B/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2011166880A (en) * | 2010-02-05 | 2011-08-25 | Hitachi Automotive Systems Ltd | Linear actuator, and suspension device using the same |
| CN101936362A (en) * | 2010-08-23 | 2011-01-05 | 扬州市开发区三特轻工机械厂 | Shock absorber |
| CN102913587A (en) * | 2012-10-25 | 2013-02-06 | 中国民航大学 | Magneto-rheological damper |
| CN203685963U (en) * | 2014-02-05 | 2014-07-02 | 吉林大学 | Multistage spiral magneto-rheological shock absorber piston assembly |
| CN108302149A (en) * | 2018-03-13 | 2018-07-20 | 华南理工大学 | Using external coil and the coefficient double-cylinder type magneto-rheological vibration damper of permanent magnet |
| CN108591343A (en) * | 2018-04-17 | 2018-09-28 | 安徽卓特信息技术有限公司 | A kind of externally-wound type MR damper of cylinder barrel positioning |
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| CN110864068A (en) | 2020-03-06 |
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Effective date of registration: 20230912 Address after: 401120 No. 19, Zhuoyue Road, Longxing Town, Liangjiang New Area, Yubei District, Chongqing (cluster registration) Patentee after: Huanshan (Chongqing) Technology Co.,Ltd. Address before: 402247 No. 1 Fuxing Road, Shuang Fu New District, Jiangjin District, Chongqing. Patentee before: CHONGQING JIAOTONG University |