KR20160133754A - Magneto-reholigical fluid damper using permanent magnet - Google Patents

Magneto-reholigical fluid damper using permanent magnet Download PDF

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Publication number
KR20160133754A
KR20160133754A KR1020150066692A KR20150066692A KR20160133754A KR 20160133754 A KR20160133754 A KR 20160133754A KR 1020150066692 A KR1020150066692 A KR 1020150066692A KR 20150066692 A KR20150066692 A KR 20150066692A KR 20160133754 A KR20160133754 A KR 20160133754A
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South Korea
Prior art keywords
piston
magnetic
vertical direction
cylinder
fluid
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KR1020150066692A
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Korean (ko)
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KR101679244B1 (en
Inventor
최승복
수레쉬 칼루반
김완호
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인하대학교 산학협력단
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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
    • 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
    • F16F2222/00—Special physical effects, e.g. nature of damping effects
    • F16F2222/06—Magnetic or electromagnetic
    • 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
    • F16F2224/00—Materials; Material properties
    • F16F2224/04—Fluids
    • F16F2224/045—Fluids magnetorheological

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  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Mechanical Engineering (AREA)
  • Fluid-Damping Devices (AREA)

Abstract

The present invention relates to a cylinder member comprising a magnetic body and having an inner space filled with an MR fluid; A piston member moving in a vertical direction in an inner space of the cylinder; And a magnetic member composed of a permanent magnet provided at one end of the piston member, wherein the cylinder member has a shape in which a magnetization area increases in accordance with a vertical movement of the piston member, and the magnetic member has a vertical The MR fluid damper according to any one of claims 1 to 3, wherein the MR fluid damper is made of a metal.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to a MR fluid damper using permanent magnets,

The present invention relates to a MR fluid damper using permanent magnets, and more particularly, to a MR fluid damper using permanent magnets that do not require a separate power supply device and can be manufactured with a simple design, thereby reducing manufacturing cost and time .

Generally, a hydraulic damper is a damper that uses the resistance of a fluid as a damping force and is used for buffering automobiles, railway cars, wheel devices of a car, a washing machine, a piping system, and the like.

The hydraulic damper is structured such that a piston composed of a piston head and a piston rod moves in a vertical direction in a cylinder made up of an upper chamber and a lower chamber and a fluid filled in the cylinder moves in the direction of the upper chamber or the lower chamber As a result of this flow, a pressure difference is generated between the upper chamber and the lower chamber, and damping force is generated in the hydraulic damper.

Recently, an MR damper filled with a magnetic flow fluid, i.e., MR fluid, in a cylinder has been used as a hydraulic damper. An example of the MR damper is disclosed in Japanese Patent Application Laid-Open No. 10-1257346. In the hydraulic damper having the variable flow path disclosed in the above prior art, the MR fluid as a working fluid is filled in the cylinder, the magnetic induction coil is provided in the piston head, and the yield stress of the MR fluid is changed So as to obtain the desired damping performance.

However, since a conventional MR damper must generate a magnetic field through electromagnetic induction, a magnetic induction coil must be separately provided, and a current must be input to the magnetic induction coil. This requires the addition of a magnetic induction coil inside the piston and a complex design procedure to prevent the MR fluid from interfering with the electrical circuit inside the damper.

As described above, the conventional MR fluid has a limitation in that a current input is required through an external power source, and time and cost are small due to a complicated damper design.

It is an object of the present invention to provide an MR fluid damper using permanent magnets which is simple in design and can reduce manufacturing cost and time without requiring a separate power supply device do.

According to an aspect of the present invention, there is provided a magnetic bearing device comprising: a cylinder member made of a magnetic material and having an inner space filled with an MR fluid; A piston member moving in a vertical direction in an inner space of the cylinder; And a magnetic member composed of a permanent magnet provided at one end of the piston member, wherein the cylinder member has a shape in which a magnetization area increases in accordance with a vertical movement of the piston member, and the magnetic member has a vertical And is rotatable in accordance with the direction movement.

Preferably, the piston member includes: an upper piston; A lower piston connected to the upper piston by an elastic member to be pulled from the upper piston or retracted toward the upper piston when the piston member moves in the vertical direction; A connecting rod connected to the upper piston through one end of the ball joint and extending through the center of the lower piston from the upper piston and having the magnetic member at the other end extending through the lower piston; A spiral groove formed in the lower piston to surround the connecting rod; And a protrusion provided on the connecting rod to move along the spiral groove when the piston member is moved in a vertical direction, and the connecting rod rotates and the magnetic member rotates when the piston member is moved in the vertical direction .

More preferably, the cylinder member is arranged such that a ferromagnetic body whose width increases along the vertical direction and a ferromagnetic body whose width decreases along the vertical direction are spaced apart from each other in the circumferential direction, and the magnetic member moves in the vertical direction of the piston member So that the magnetization area of the ferromagnetic body is always increased.

Here, the cylinder member may include a body made of a paramagnetic material having four hollow portions spaced apart from each other at an angle of 90 degrees with respect to the inner space and having the inner space. An annular body communicating with the internal space and having a through hole through which the piston member passes; and a second hollow portion extending from the annular body and being inserted into two hollow portions spaced at an angle of 180 degrees from each other, An upper member having a pair of ferromagnetic bodies of a shape whose width is reduced; And a lower member formed of a pair of ferromagnetic bodies extending from the disk-shaped body and inserted into the remaining two hollow portions of the two hollow portions and increasing in width downward.

The present invention does not require a separate magnetic induction coil and a power supply to power the magnetic induction coil to change the rheological properties of the MR fluid. Therefore, the design of the MR fluid damper is simple, and the manufacturing cost and time of the MR fluid damper can be reduced.

Further, since the magnetized area always increases when the piston member moves, the present invention can always obtain a large damping force at the time of occurrence of vibration.

In addition, the present invention can adjust the damping force of the damper by variously configuring the rotation angle of the magnetic member and the shape of the ferromagnetic body.

1A and 1B are side views schematically showing a MR fluid damper using permanent magnets according to the present invention, in which the piston member shows an increased state of magnetization area at the time of rising,
FIGS. 2A and 2B are side views schematically showing an MR fluid damper using permanent magnets according to the present invention, in which the piston member shows an increase in magnetized area when the piston member is lowered,
FIG. 3A is a schematic view of a piston member of an MR fluid damper using permanent magnets according to the present invention, showing the position of a magnetic member when a lower piston is pulled,
FIG. 3B is a view schematically showing the piston member of the MR fluid damper using the permanent magnet according to the present invention, showing the position of the magnetic member when the lower piston is contracted,
4 is an exploded perspective view showing a cylinder member of an MR fluid damper using permanent magnets according to the present invention.

Hereinafter, a preferred embodiment of a MR fluid damper using permanent magnets according to the present invention will be described in detail with reference to the accompanying drawings. In the following description of the present invention, it is to be understood that the terminology used herein is for the purpose of describing particular embodiments only, and is not intended to be limiting of the technical scope of the present invention. Will be.

Referring to FIGS. 1A and 2B, a MR fluid damper using a permanent magnet according to the present invention includes a cylinder member 100, a piston member 200, and a magnetic member 300.

The cylinder member 100 as a whole is a cylindrical member and a predetermined space 101 is formed therein. The MR fluid 102 is filled in the inner space 101. The cylinder member 100 is made of a magnetic material and changes the magnetization area by the movement of the magnetic member 300, which will be described later, thereby changing the yield stress of the MR fluid 102.

The piston member 200 is inserted into the through hole 103 formed in the upper portion of the cylinder member 100 and is disposed movably in the vertical direction in the inner space 101 of the cylinder member 100. A seal member 104 is provided between the through hole 103 of the cylinder member 100 and the piston member 200 to seal the inner space 101 of the cylinder member 100 filled with the MR fluid 102 Seal it.

The magnetic member (300) is made of a permanent magnet provided at one end of the piston member (200).

A vibration generating medium (for example, a motor vehicle, a railway vehicle, a wheel device of an aircraft, a washing machine, etc.) is attached to the other end of the piston member 200 located on the opposite side of one end of the piston member 200 provided with the magnetic member 300 And a device for generating vibration) is connected.

Here, the cylinder member 100 has a shape in which the magnetization area by the magnetic member 300 increases with the movement of the piston member 200 in the vertical direction. The magnetic member 300 is configured to be rotatable in accordance with the vertical movement of the piston member 200.

With this configuration, when vibration is generated in the vibration generating medium, the piston member 200 moves in the vertical direction, thereby increasing the magnetization area between the magnetic member 300 and the magnetic member of the cylinder member 100 (The arrows shown in Figs. 1A to 2B indicate the intensity of the magnetic field lines). Therefore, the rheological property of the MR fluid 102 filled in the inner space of the cylinder member 100, that is, the yield stress is increased to increase the damping force of the damper.

As described above, the MR fluid damper using the permanent magnet according to the present invention does not require a separate magnetic induction coil and a power supply for supplying power to the magnetic induction coil in order to change the rheological properties of the MR fluid. Therefore, the design of the MR fluid damper is simple, and the manufacturing cost and time of the MR fluid damper can be reduced.

Referring to FIGS. 3A and 3B, the piston member 200 includes an upper piston 210, a lower piston 220, and a connecting rod 230.

The upper piston 210 and the lower piston 220 are connected to each other through an elastic member 201 such as a spring so that when the piston member 200 moves in the vertical direction, The lower piston 220 is pushed from the upper piston 210 by the member 201 and the lower piston 220 is moved toward the upper piston 210 by the resistance force of the sealing member 104 when the piston member 200 is lifted Contracted.

One end of the connecting rod 230 is connected to the upper piston 210 through the ball joint 231 and is freely rotatable about the upper piston 210. The connecting rod 230 extends through the center of the lower piston 220 from the upper piston 210 and extends through the lower piston 220 and is provided with the magnetic member 300 at the other end.

Here, a spiral groove 221 is formed in the lower piston 220 so as to surround the connecting rod 230. The connecting rod 230 is provided with a protrusion 232 which is inserted into the helical groove 221 and moves along the helical groove 221 when the piston member 200 moves in the vertical direction.

When the piston member 200 moves vertically, the lower piston 220 is lifted from the upper piston 210 by the elastic member 201 when the piston member 200 is lifted up, When the piston member 200 is lowered, it is contracted by the upper piston 210 due to the resistance force of the sealing member 104 made of rubber or the like, and the connecting rod 230 is rotated. Therefore, the magnetic member 300 provided at the other end of the connecting rod 230 rotates. The helical groove 221 of the lower piston 220 and the protrusion 232 of the connecting rod 230 are preferably designed such that the magnetic member 300 rotates at an angle of 90 degrees when the piston member 200 moves .

4, the cylinder member 100 includes a ferromagnetic body 122 whose width increases along the vertical direction corresponding to the vertical movement direction of the piston member 200 and a ferromagnetic body 132 whose width is decreased by the cylinder member 100 Are spaced apart from each other along the circumferential direction of the inner space 101 of the housing.

According to the structure of the cylinder member 100, the magnetic member 300 moves in the vertical direction while rotating according to the vertical movement of the piston member 200, thereby changing the magnetization area of the ferromagnetic bodies 122 and 132. At this time, by the shape of the ferromagnetic bodies 122 and 132 of the cylinder member 100, and by the rotation and vertical movement of the magnetic member 300, the magnetized area of the ferromagnetic body is maintained Is always increased in accordance with the movement of the member (200).

Specifically, the cylinder member 100 includes a main body 110, an upper member 120, and a lower member 130.

The main body 110 is a cylindrical member having an inner space 101 at the center and has four hollow portions 111 and 112 spaced at an angle of 90 degrees with respect to the inner space 101 in the circumferential direction. These hollows 111 and 112 are seen in a triangular or inverted triangle as viewed from the center of the body 110. Here, the triangular hollows 112 face each other at an angle of 180 degrees along the circumferential direction, and the inverted triangular hollows 111 also face each other at an angle of 180 degrees along the circumferential direction. That is, the four hollow portions 111 and 112 are arranged in a triangular shape and an inverted triangular shape in the circumferential direction.

The upper member 120 has a ring-shaped body 121 and a pair of ferromagnetic bodies 122. The annular body 121 has a through hole 103 communicating with the internal space 101 of the main body 110 and through which the piston member 200 passes. The ferromagnetic body 122 extends vertically downward from the annular body 121 and is inserted into two hollow portions 111 of inverted triangles facing each other at a distance of 180 degrees from each other among the four hollow portions 111 and 112 do. Here, the ferromagnetic body 122 of the upper member 120 has an inverted triangular shape whose width decreases vertically downward.

The lower member 130 has a disc-shaped body 131 and a pair of ferromagnetic bodies 132. The disc-shaped body 131 forms the bottom surface of the main body 110. The pair of ferromagnetic bodies 132 extend vertically upward from the disc-shaped body 131 and are respectively inserted into the remaining two hollow portions 112 of the four hollow portions 111 and 112 described above. Here, the ferromagnetic body 132 of the lower member 130 has a triangular shape whose width decreases vertically upward.

The upper member 120 and the lower member 130 are inserted into the main body 110 from above and below the main body 110 to form the cylinder member 100, respectively. Here, the upper member 120 and the lower member 130 are preferably ferromagnetic materials such as iron, and the main body 110 is preferably a paramagnetic material such as aluminum.

With this configuration, when the piston member 200 moves in the vertical direction in the inner space 101 of the cylinder member 100 due to the vibration of the external vibration medium, the magnetic member 300 rotates and moves in the vertical direction The area of the ferromagnetic bodies 122 and 132 adjacent to the magnetic member 300 increases. Accordingly, as the piston member 200 moves vertically, the magnetization area of the ferromagnetic body increases, yielding stress of the MR fluid increases, and thus a large damping force can be obtained.

Hereinafter, the operation of the MR fluid damper using the permanent magnet according to the present invention will be described in detail with reference to the accompanying drawings.

1A, the magnetic member 300 is located at the top of the cylinder member 100, where the anode of the magnetic member 300 is positioned adjacent to the ferromagnetic member 122 of the top member 120 do. 3, when the piston member 200 is lowered by the external vibration, the relative movement of the upper piston 210 and the lower piston 220 at the initial stage of the descent, The connecting rod 230 rotates 90 degrees and the magnetic member 300 rotates by 90 degrees as the connecting rod 232 moves along the spiral groove 221. [ Then, the anode of the magnetic member 300 is positioned adjacent to the ferromagnetic body 132 of the lower member 130. [ 1B, as the piston member 200 is lowered, the anode of the magnetic member 300 moves in the vertical direction along the ferromagnetic body 132 of the lower member 130, where the lower member 130 Of the ferromagnetic body 132 increases in the area of the portion facing the magnetic member 300 along the descending direction of the piston member 200, so that the magnetization area increases. Therefore, since the magnetic force applied to the MR fluid increases, the yield stress of the MR fluid increases, so that a large damping force can be obtained.

2A, the magnetic member 300 is located at the lower portion of the cylinder member 100, and the anode of the magnetic member 300 is positioned adjacent to the ferromagnetic member 132 of the lower member 130 do. In this state, when the piston member 200 is lifted by the external vibration, the protrusion 232 of the connecting rod 230 is moved in the helical groove 221 by the relative movement of the upper piston 210 and the lower piston 220 The connecting rod 230 rotates again by 90 degrees, and thus the magnetic member 300 also rotates 90 degrees. 2B, as the piston member 200 is lifted, the anode of the magnetic member 300 moves in the vertical direction along the ferromagnetic body 122 of the upper member 120, The area of the ferromagnetic body 122 facing the magnetic member 300 increases along the lifting direction of the piston member 200, thereby increasing the magnetizing area. Therefore, since the magnetic force applied to the MR fluid increases, the yield stress of the MR fluid increases, so that a large damping force can be obtained.

As described above, the MR fluid damper using the permanent magnet according to the present invention can obtain a large damping force because the magnetized area by the magnetic member 300 always increases when the piston member 200 is lifted and lowered. In addition, the damping force of the damper can be adjusted by variously configuring the rotation angle of the magnetic member 300 and the shapes of the ferromagnetic bodies 122 and 132.

The embodiments of the present invention described above are merely illustrative of the technical idea of the present invention, and the scope of protection of the present invention should be interpreted according to the claims. It will be apparent to those skilled in the art that various modifications and variations can be made in the present invention without departing from the spirit and scope of the invention as defined by the appended claims. It should be interpreted that it is included in the scope of right.

100: cylinder member 101: inner space
102: MR fluid 103: Through hole
104: sealing member 110:
111, 112: hollow portion 120: upper member
121: Round body 122: Ferromagnetic
130: lower member 131:
132: ferromagnetic body 200: piston member
201: elastic member 210: upper member
220: lower member 221: spiral groove
230: connecting rod 231: ball joint
232: protrusion

Claims (4)

A cylinder member made of a magnetic material and having an inner space filled with an MR fluid;
A piston member moving in a vertical direction in an inner space of the cylinder; And
And a magnetic member made of a permanent magnet provided at one end of the piston member,
Wherein the cylinder member has a shape in which a magnetization area increases in accordance with a vertical movement of the piston member and the magnetic member is configured to be rotatable in accordance with a vertical movement of the piston member. Damper.
The method according to claim 1,
Wherein the piston member comprises:
An upper piston;
A lower piston connected to the upper piston by an elastic member to be pulled from the upper piston or retracted toward the upper piston when the piston member moves in the vertical direction;
A connecting rod connected to the upper piston through one end of the ball joint and extending through the center of the lower piston from the upper piston and having the magnetic member at the other end extending through the lower piston;
A spiral groove formed in the lower piston to surround the connecting rod; And
And a protrusion provided on the connecting rod to move along the spiral groove when the piston member is moved in the vertical direction,
And when the piston member moves vertically, the connecting rod rotates to rotate the magnetic member.
3. The method of claim 2,
Wherein the cylinder member includes a ferromagnetic body having a width increasing along a vertical direction and a ferromagnetic body having a width decreasing along a vertical direction,
Wherein the magnetic member moves in the vertical direction while rotating in accordance with the vertical movement of the piston member to always increase the magnetization area of the ferromagnetic body.
The method of claim 3,
Wherein the cylinder member comprises:
A main body made of a paramagnetic material and having four hollow portions spaced apart from each other at an angle of 90 degrees with respect to the inner space;
An annular body communicating with the internal space and having a through hole through which the piston member passes; and a second hollow portion extending from the annular body and being inserted into two hollow portions spaced at an angle of 180 degrees from each other, An upper member having a pair of ferromagnetic bodies of a shape whose width is reduced; And
And a lower member which is formed of a pair of ferromagnetic bodies extending from the disk-shaped body and inserted into the remaining two hollow portions of the two hollow portions and whose width increases in a downward direction. MR fluid damper used.
KR1020150066692A 2015-05-13 2015-05-13 Magneto-reholigical fluid damper using permanent magnet KR101679244B1 (en)

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Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20200001805A (en) * 2018-06-28 2020-01-07 인하대학교 산학협력단 Above knee prosthesis having MR damper
KR102131787B1 (en) * 2019-03-05 2020-07-08 인하대학교 산학협력단 MR damper with controllable damping
KR102169167B1 (en) * 2019-06-19 2020-10-22 인하대학교 산학협력단 Permanent magnet based mr damper for realizing vibration reduction controller
KR20210087821A (en) * 2020-01-03 2021-07-13 인하대학교 산학협력단 Magneto-Rheological Damper based on Permanent Magnet
KR20220140076A (en) 2021-04-08 2022-10-18 알엠에스테크놀러지(주) Displacement sensitive variable MR damper and air spring apparatus including it and vibration control method by using the apparatus

Families Citing this family (1)

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Publication number Priority date Publication date Assignee Title
KR102029890B1 (en) * 2018-04-06 2019-10-08 인하대학교 산학협력단 Permanent magnet based magneto-rheological damper

Family Cites Families (4)

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Publication number Priority date Publication date Assignee Title
JP4245456B2 (en) 2003-10-24 2009-03-25 株式会社デルタツーリング Shock absorber
JP2005291284A (en) 2004-03-31 2005-10-20 Hitachi Ltd Damper
JP2008223814A (en) * 2007-03-09 2008-09-25 Honda Motor Co Ltd Variable damping force damper
FR2952985B1 (en) * 2009-11-25 2012-01-13 Commissariat Energie Atomique SEMI-ACTIVE DEVICE IN TRANSLATION AND ROTATION

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR20200001805A (en) * 2018-06-28 2020-01-07 인하대학교 산학협력단 Above knee prosthesis having MR damper
KR102131787B1 (en) * 2019-03-05 2020-07-08 인하대학교 산학협력단 MR damper with controllable damping
KR102169167B1 (en) * 2019-06-19 2020-10-22 인하대학교 산학협력단 Permanent magnet based mr damper for realizing vibration reduction controller
KR20210087821A (en) * 2020-01-03 2021-07-13 인하대학교 산학협력단 Magneto-Rheological Damper based on Permanent Magnet
KR20220140076A (en) 2021-04-08 2022-10-18 알엠에스테크놀러지(주) Displacement sensitive variable MR damper and air spring apparatus including it and vibration control method by using the apparatus

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