AU2020101328A4 - Shear mode magnetorheological (MR) damper - Google Patents
Shear mode magnetorheological (MR) damper Download PDFInfo
- Publication number
- AU2020101328A4 AU2020101328A4 AU2020101328A AU2020101328A AU2020101328A4 AU 2020101328 A4 AU2020101328 A4 AU 2020101328A4 AU 2020101328 A AU2020101328 A AU 2020101328A AU 2020101328 A AU2020101328 A AU 2020101328A AU 2020101328 A4 AU2020101328 A4 AU 2020101328A4
- Authority
- AU
- Australia
- Prior art keywords
- cylinder
- telescopic
- outer cylinder
- telescopic cylinder
- inner cylinder
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Ceased
Links
Classifications
-
- 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
- F16F9/06—Springs, vibration-dampers, shock-absorbers, or similarly-constructed movement-dampers using a fluid or the equivalent as damping medium using both gas and liquid
- F16F9/062—Bi-tubular units
-
- 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
- F16F9/06—Springs, vibration-dampers, shock-absorbers, or similarly-constructed movement-dampers using a fluid or the equivalent as damping medium using both gas and liquid
- F16F9/066—Units characterised by the partition, baffle or like element
- F16F9/067—Partitions of the piston type, e.g. sliding pistons
-
- 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
- F16F9/36—Special sealings, including sealings or guides for piston-rods
- F16F9/369—Sealings for elements other than pistons or piston rods, e.g. valves
-
- 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
- F16F9/43—Filling or drainage arrangements, e.g. for supply of gas
-
- 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
-
- 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
- F16F9/54—Arrangements for attachment
Landscapes
- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Physics & Mathematics (AREA)
- Electromagnetism (AREA)
- Fluid-Damping Devices (AREA)
- Vibration Prevention Devices (AREA)
Abstract
A shear mode magnetorheological (MR) damper includes an inner cylinder, an
outer cylinder, and a telescopic cylinder between the inner cylinder and the outer
cylinder, where sealing rings provide a sealing effect between the telescopic cylinder
and the inner cylinder and between the telescopic cylinder and the outer cylinder to
form a closed chamber for accommodating MR fluid; a telescopic rod moving along
with the telescopic cylinder is arrange in the telescopic cylinder; a coil base is fixed to
the tail end of the telescopic rod, an annular coil groove formed in the external wall of
the coil base is wound with spiral coils, and magnetic fields are generated after the
spiral coils are electrified; operating clearances are respectively retained between the
telescopic cylinder and the inner cylinder and between the telescopic cylinder and the
outer cylinder, and the magnetic fields act on MR fluid in the operating clearances; and
a compensating cylinder is arranged outside a small through hole in the bottom of the
outer cylinder. The present invention can generate a large damping force at a low
frequency and thus can provide a considerable anti-roll damping force when a vehicle is
turning, thereby effectively preventing the vehicle body against roll and improving the
cornering capability and driving safety of the vehicle.
1/3
DRAWINGS
2
21
4
20
6
7
FIG. 1
Description
1/3
2 21
4
6 7
FIG. 1
The present invention relates to a shear mode magnetorheological (MR) damper, and belongs to the field of automobile parts.
In the presence of an external magnetic field, MR fluid has viscosity, plasticity, and other rheological properties changed rapidly and can turn semisolid from liquid in several milliseconds, thus having controllable yield strength. Moreover, such change is reversible. The rheological properties of the MR fluid can be effectively controlled through a change to currents. Based on this principle, an MR damper generating a continuously adjustable damping force can be designed.
Currently, most common MR dampers are telescopic valve type MR dampers, which generate a pressure difference between an upper chamber and a lower chamber by means of the top-bottom movement of a piston to make sure that MR fluid flows through a damping channel in the piston, in this way, a controllable damping force can be generated. Such MR dampers generate a quite small damping force at a low frequency. A vehicle body has a low roll frequency when the vehicle is turning, as a result, the telescopic valve type MR dampers cannot provide a sufficient damping force and is unable to effectively control the roll of the vehicle. Consequentially, the rollover of the vehicle may be occurred in severe cases.
The objective of the present invention is to solve the problems of the above existing MR dampers by providing a shear mode MR damper, which generates a large damping force at a low frequency and thus can provide a considerable anti-roll damping force when a vehicle is turning, thereby effectively preventing the vehicle body against roll and improving the cornering capability and driving safety of the vehicle.
To achieve the above objective, the present invention provides the following technical solution: a shear mode MR damper includes an inner cylinder, an outer cylinder, and a telescopic cylinder between the inner cylinder and the outer cylinder, where sealing rings are arranged on upper portions of the inner cylinder and the outer cylinder, and provide a sealing effect between the telescopic cylinder and the inner cylinder and between the telescopic cylinder and the outer cylinder to form a closed chamber for accommodating MR fluid; a linear motion bearing is arranged on the upper portion of the outer cylinder, and the telescopic cylinder moves up and down along the linear motion bearing and is internally provided with a telescopic rod moving along with the telescopic cylinder; a coil base is fixed to the tail end of the telescopic rod, and a clearance is retained between the coil base and the inner cylinder to reduce the abrasion between the wall of the inner cylinder and the coil base; annular coil grooves formed in the external wall of the coil base are wound with spiral coils, and magnetic fields are generated after the spiral coils are electrified; operating clearances are respectively retained between the telescopic cylinder and the inner cylinder and between the telescopic cylinder and the outer cylinder, and the magnetic fields act on MR fluid in the operating clearances to change the constitutive relation of the MR fluid; a compensating cylinder is arranged outside a small through hole in the bottom of the outer cylinder and is divided into an upper chamber and a lower chamber through a compensating piston in the compensating cylinder; and the lower chamber communicated with the outer cylinder via the small through hole is filled with MR fluid, and air with certain pressure is injected into the upper chamber via an air faucet at the top of the upper chamber to make the operating clearances full of the MR fluid all the time.
Further, positioning copper rings having a certain thickness are arranged above and below the coil base and are directly in contact with the wall of the inner cylinder to make corresponding positions of the coil base and the wall of the inner cylinder unchanged.
Further, the coil base is made of electrical pure iron which is magnetically permeable.
Further, three annular coil grooves are formed in the coil base.
Further, the cover fixes the linear motion bearing and fixedly covers an annular lug boss on the upper portion of the outer cylinder through a bolt.
Further, two sealing rings are respectively arranged between the inner cylinder and the telescopic cylinder and between the outer cylinder and the telescopic cylinder to prevent the MR fluid flowing out of the closed chamber.
Further, the air with certain pressure is injected into the upper chamber via the air faucet.
Further, a washer between the compensating cylinder and the outer cylinder is connected to the compensating cylinder and the outer cylinder through a bolt.
Further, an upper lifting lug is arranged at the top of the telescopic cylinder and has an inner side along which a rubber bushing is disposed.
Further, a lower lifting lug is arranged at the bottom of the outer cylinder and has an inner side along which a rubber bushing is disposed.
According to the MR damper of the present invention, particles in the MR fluid are disordered without an external magnetic field, in this case, the telescopic cylinder overcomes a viscous resistance to continue to move. Consequentially, a damping force from the telescopic cylinder is quite small. When the external magnetic field is applied, the particles in the MR fluid are distributed in a chain shape in the direction of the magnetic field, and the MR fluid is turned to be semisolid from being liquid; in this case, the telescopic cylinder needs to overcome a shear stress generated by the telescopic cylinder and the MR fluid to move, the damper operates in a shear mode, and the shear stress is increasingly intensified with the increase of the magnetic field strength. Accordingly, if an operating current is sufficiently large, a large damping force can be generated even at a speed close to zero.
Compared with the prior art, the present invention has the following beneficial effects:
(1) The present invention generates the damping force in the shear mode by means of a simple structure, and the overall structure is novel and easy to manufacture.
(2) The MR damper of the present invention generates the damping force mainly in the shear mode of the MR fluid and thus can generate a considerable damping force at a low speed.
(3) The MR damper of the present invention can effectively reduce the vibration of a vehicle body when the vehicle is running straightly, and effectively prevent the vehicle body against roll by generating a large damping force at a low frequency when the vehicle is turning, thus fulfilling better anti-roll performance and ride comfort of the vehicle and increasing the cornering speed of the vehicle.
(4) The present invention overcomes the defect of existing MR dampers that most coils are arranged in pistons, resulting in a severe influence of a structure size on the number of the spiral coils. The coil base is large and can be wound with three spiral coils in structure, so that the present invention can achieve higher magnetic field strength and a larger magnetic field range and generate a larger damping force. Accordingly, the damping force can be adjusted within a larger range.
(5) Excitation coils are arranged in the grooves in the coil base, that is, the excitation coils are arranged in a large space, so that the requirement for accuracy is not high; and compared with the fact that the coils are arranged in quite small pistons, the difficulty in machining is lowered, the machining time is shorted, and the machining cost is reduced.
(6) In the MR damper of the present invention, shear forces are respectively generated between the internal wall of the telescopic cylinder and the inner cylinder and between the external wall of the telescopic cylinder and the outer cylinder, so that an effective operating area of the shear mode is increased. Accordingly, the corresponding MR damper can generate the larger damping force.
(7) The MR damper of the present invention as well as a MR damper designed based on a related principle can be widely used in other related fields.
FIG. 1 is a schematic view showing the overall structure of the present invention;
FIG. 2 is a schematic view of a magnetic field distribution;
FIG. 3 is a sectional view of A-A of the present invention.
In the figure: 1. upper lifting lug, 2. rubber bushing, 3. telescopic cylinder, 4. telescopic rod, 5. linear motion bearing, 6. sealing ring, 7. outer cylinder, 8. inner cylinder, 9. operating clearance, 10. positioning copper ring, 11. coil base, 12. coil, 13. nut, 14. lower lifting lug, 15. bolt, 16. washer, 17. compensating cylinder, 18. piston, 19. air faucet, 20. cover, 21. bolt B, 101. magnetic field, 102. MR fluid.
The following clearly and completely describes the technical solutions in the examples of the present invention with reference to accompanying drawings in the examples of the present invention. Apparently, the described examples are merely a part rather than all of the examples of the present invention. All other examples obtained by a person of ordinary skill in the art based on the examples of the present invention without creative efforts shall fall within the protection scope of the present invention. All other examples obtained by a person of ordinary skill in the art based on the examples of the present invention without creative efforts shall fall within the protection scope of the present invention.
As shown in FIG. 1 to FIG. 3, a shear mode MR damper of the present invention mainly includes: an upper lifting lug 1, rubber bushings 2, a telescopic cylinder 3, a telescopic rod 4, a linear motion bearing 5, sealing rings 6, an outer cylinder 7, an inner cylinder 8, operating clearances 9, positioning copper rings 10, a coil base 11, a lower lifting lug 14, a compensating cylinder 17, a piston 18, an air faucet 19, a cover 20, and the like, where a closed chamber formed by the telescopic cylinder 3 together with the inner cylinder and the outer cylinder is filled with MR fluid; the cover 20 fixes the linear motion bearing 5 and is connected to the outer cylinder 7 through a bolt B21; the telescopic cylinder 3 between the inner cylinder and the outer cylinder reciprocates upwards in the vertical direction; the coil base 11 connected to the telescopic rod 4 is made of electrical pure iron which is magnetically permeable, and three annular coil grooves formed in the coil base 11 are wounded with varnished wires; two sealing rings 6 are respectively arranged between the inner cylinder 8 and the telescopic cylinder 3 and between the outer cylinder 7 and the telescopic cylinder 3 to prevent the MR fluid from flowing out of the closed chamber; the cover 20 fixedly covers an annular lug boss on the upper portion of the outer cylinder 7 through the bolt B21; the compensating cylinder 17 is communicated with the outer cylinder 7 via a small through hole in the bottom of the outer cylinder 7 and is divided into an upper chamber and a lower chamber through a compensating piston 18; the lower chamber communicated with the outer cylinder 7 is filled with MR fluid; air with certain pressure is injected into the upper chamber via the air faucet 19 at the top of the upper chamber; and a washer 16 between the compensating cylinder 17 and the outer cylinder 7 is connected to the compensating cylinder 17 and the outer cylinder 7 through a bolt A15.
The operating principle of the shear mode MR damper is as follows: the upper lifting lug 1 is connected to a vehicle body, and the lower lifting lug 14 is connected to a chassis frame; when the vehicle is running, the MR damper is stretched and compressed during the relative movement of an upper connection portion and a lower connection portion, the telescopic cylinder 3 vertically reciprocates up and down to drive the coil base 11 fixed to the telescopic rod 4 to move back and forth, and the operating clearances 9 are respectively retained between the telescopic cylinder 3 and the inner cylinder and between the telescopic cylinder 3 and the outer cylinder. The closed chamber is full of the MR fluid all the time in the presence of the compensating cylinder 17; and shear stresses generated between the internal wall of the telescopic cylinder 3 and the inner cylinder 8 and between the external wall of the telescopic cylinder 3 and the outer cylinder 7 are changed when magnetic field strength is changed, and the magnetic field strength is affected by a current across a coil 12, so that a damping force from the damper can be continuously controlled through a control over the current across the coil 12. The MR damper of the present invention generates the damping force mainly in the shear mode of the MR fluid, a damping force model in the shear mode is affected by dynamic viscosity and yield strength of the MR fluid, the dynamic viscosity is negligible compared with a shear yield stress of the MR damper, and accordingly, the damping force will not affected by the speed of the relative movement. When the speed is equal to zero, a considerable damping force can be generated in a case where a certain exciting current is applied and a shear area is sufficient. That is, the MR damper of the present invention can generate a large damping force at a low frequency, thus achieving a better anti-roll effect compared with a common valve type MR damper when the vehicle is turning.
The foregoing displays and describes the basic principles, the main features and the advantages of the present invention. Those skilled in the art should understand that the above examples are not intended to limit the present invention in any form, and that any technical solutions obtained by means of equivalent replacement or equivalent transformation should fall within the protection scope of the present invention.
Other features or elements not mentioned in the present invention are the same as those in the prior art or can be implemented by the prior art.
Claims (5)
1. A shear mode magnetorheological (MR) damper, comprising an inner cylinder, an outer cylinder, and a telescopic cylinder between the inner cylinder and the outer cylinder, wherein sealing rings are arranged on upper portions of the inner cylinder and the outer cylinder, and provide a sealing effect between the telescopic cylinder and the inner cylinder and between the telescopic cylinder and the outer cylinder to form a closed chamber for accommodating MR fluid; a linear motion bearing is arranged on an upper portion of the outer cylinder, and the telescopic cylinder moves up and down along the linear motion bearing and is internally provided with a telescopic rod moving along with the telescopic cylinder; a coil base is fixed to a tail end of the telescopic rod, and a clearance is retained between the coil base and the inner cylinder; annular coil grooves formed in an external wall of the coil base are wound with spiral coils, and magnetic fields are generated after the spiral coils are electrified; operating clearances are respectively retained between the telescopic cylinder and the inner cylinder and between the telescopic cylinder and the outer cylinder, and the magnetic fields act on MR fluid in the operating clearances; a compensating cylinder is arranged outside a small through hole in a bottom of the outer cylinder and is divided into an upper chamber and a lower chamber through a compensating piston in the compensating cylinder; the lower chamber communicated with the outer cylinder via the small through hole is filled with MR fluid; and air with certain pressure is injected into the upper chamber via an air faucet at a top of the upper chamber to make the operating clearances full of the MR fluid all the time.
2. The shear mode MR damper according to claim 1, wherein positioning copper rings having a certain thickness are arranged above and below the coil base and are directly in contact with a wall of the inner cylinder to make corresponding positions of the coil base and the wall of the inner cylinder unchanged.
3. The shear mode MR damper according to claim 1 or 2, wherein three annular coil grooves are formed in the coil base.
4. The shear mode MR damper according to claim 1, wherein the cover fixes the linear motion bearing and fixedly covers an annular lug boss on the upper portion of the outer cylinder through a bolt.
5. The shear mode MR damper according to claim 1, wherein two sealing rings are respectively arranged between the inner cylinder and the telescopic cylinder and between the outer cylinder and the telescopic cylinder to prevent the MR fluid flowing out of the closed chamber.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910623043.8 | 2019-07-11 | ||
| CN201910623043.8A CN110296174B (en) | 2019-07-11 | 2019-07-11 | Shear mode magneto-rheological shock absorber |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| AU2020101328A4 true AU2020101328A4 (en) | 2020-08-20 |
Family
ID=68030825
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| AU2020101328A Ceased AU2020101328A4 (en) | 2019-07-11 | 2020-07-10 | Shear mode magnetorheological (MR) damper |
Country Status (2)
| Country | Link |
|---|---|
| CN (1) | CN110296174B (en) |
| AU (1) | AU2020101328A4 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115182947A (en) * | 2022-06-20 | 2022-10-14 | 清华大学 | Viscous resistance determining method, viscous resistance determining apparatus, electronic device, medium, and program product |
Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111059202B (en) * | 2020-01-07 | 2021-10-22 | 南京林业大学 | Double-rod-out shearing mode magneto-rheological damper |
| CN111043223B (en) * | 2020-01-07 | 2022-03-25 | 南京林业大学 | Telescopic shear mode magneto-rheological shock absorber |
| CN111338208B (en) * | 2020-03-02 | 2022-05-20 | 南京林业大学 | Vehicle side-tipping and smoothness coordination control method |
| CN113585508A (en) * | 2021-07-29 | 2021-11-02 | 武汉理工大学 | Intelligent diagonal bracing damper based on magnetorheological elastomer |
Family Cites Families (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2003278814A (en) * | 2002-03-25 | 2003-10-02 | Sankyo Seiki Mfg Co Ltd | Damper device |
| DE102012016946A1 (en) * | 2012-08-28 | 2014-03-06 | Dt Swiss Ag | Suspension fork, especially for bicycles |
| CN103470674B (en) * | 2013-09-30 | 2015-10-21 | 湘潭大学 | A kind of Inner-channel vehicle suspension system magnetorheological damper |
| CN204805404U (en) * | 2015-03-26 | 2015-11-25 | 六盘水师范学院 | Magnetorheological suspensions gas -liquid buffer |
| CN105134856B (en) * | 2015-09-21 | 2017-09-22 | 无锡市弘谷振控技术有限公司 | External stayed cable closed cylinder type sticky shearing type damper |
| CN105889397B (en) * | 2016-05-26 | 2018-01-02 | 河南机电高等专科学校 | A kind of single rod bitubular magneto-rheological damper with double-coil |
| CN206600402U (en) * | 2017-04-09 | 2017-10-31 | 华东交通大学 | The MR damper of energy acquisition is carried out using double-deck magnet and double-layer coil |
| CN207795958U (en) * | 2018-01-12 | 2018-08-31 | 华东交通大学 | A kind of MR damper of integrated self-cooling set |
-
2019
- 2019-07-11 CN CN201910623043.8A patent/CN110296174B/en active Active
-
2020
- 2020-07-10 AU AU2020101328A patent/AU2020101328A4/en not_active Ceased
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115182947A (en) * | 2022-06-20 | 2022-10-14 | 清华大学 | Viscous resistance determining method, viscous resistance determining apparatus, electronic device, medium, and program product |
Also Published As
| Publication number | Publication date |
|---|---|
| CN110296174B (en) | 2021-02-26 |
| CN110296174A (en) | 2019-10-01 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| FGI | Letters patent sealed or granted (innovation patent) | ||
| MK22 | Patent ceased section 143a(d), or expired - non payment of renewal fee or expiry |