JPH0243059B2 - - Google Patents
Info
- Publication number
- JPH0243059B2 JPH0243059B2 JP57119269A JP11926982A JPH0243059B2 JP H0243059 B2 JPH0243059 B2 JP H0243059B2 JP 57119269 A JP57119269 A JP 57119269A JP 11926982 A JP11926982 A JP 11926982A JP H0243059 B2 JPH0243059 B2 JP H0243059B2
- Authority
- JP
- Japan
- Prior art keywords
- cylinder
- excitation coil
- magnetic fluid
- piston
- orifice
- 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.)
- Expired - Lifetime
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
- F16F9/32—Details
- F16F9/53—Means for adjusting damping characteristics by varying fluid viscosity, e.g. electromagnetically
- F16F9/535—Magnetorheological [MR] fluid dampers
Landscapes
- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Physics & Mathematics (AREA)
- Electromagnetism (AREA)
- Mechanical Engineering (AREA)
- Fluid-Damping Devices (AREA)
Description
【発明の詳細な説明】
この発明は、極めて簡易な手段で減衰力を自動
調整する緩衝装置に関するものである。DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a shock absorber that automatically adjusts damping force using extremely simple means.
振動や緩衝をピストンの作動に変え内部油の流
動抵抗で減衰を行なう緩衝装置として、オイルダ
ンパがある。一般的なオイルダンパは、油を封入
したシリンダ内にピストンを摺動させ、ピストン
に設けた油路に油が通過するときに発生する減衰
力で振動や衝撃を吸収するものである。しかし従
来この種装置にあつては、油温が上昇することに
より油の粘性が低下し、それに伴ない減衰力が下
がり安定した減衰力を発生し得ないばかりか緩衝
能力が不十分となる場合もある。 An oil damper is a shock absorbing device that converts vibration and damping into the action of a piston and dampens it using the flow resistance of internal oil. A typical oil damper has a piston that slides inside a cylinder filled with oil, and absorbs vibrations and shocks using the damping force generated when the oil passes through an oil passage provided in the piston. However, in conventional devices of this type, as the oil temperature rises, the viscosity of the oil decreases, resulting in a corresponding decrease in damping force, making it impossible to generate a stable damping force, and resulting in insufficient buffering capacity. There is also.
この発明は、これらの欠点を解決する緩衝装置
を提供するもので、その特徴とするところは、緩
衝媒体に磁力により粘性が変化する磁性流体を用
い、この磁性流体の粘性を電気的に変化させて減
衰力を自動調整し、温度変化があつても安定した
減衰力を発生可能となした点にある。 The present invention provides a buffer device that solves these drawbacks, and its characteristics are that a magnetic fluid whose viscosity changes due to magnetic force is used as a buffer medium, and the viscosity of this magnetic fluid is changed electrically. The key point is that the damping force can be automatically adjusted and a stable damping force can be generated even when there are temperature changes.
以下、この発明の一実施態様を図面に基づいて
説明する。 Hereinafter, one embodiment of the present invention will be described based on the drawings.
図面は、極く一般的なオイルダンパに適用した
例を示すもので、１は磁性流体が封入されたシリ
ンダー、２はピストン、３は中空のピストンロツ
ドで、ピストン２およびピストンロツド３にはそ
れぞれ油路２−１、油孔３−１が設けられてい
る。４はシリンダー１の一端に植設した固定ロツ
ドで、該ロツドは中空のピストンロツド３の先端
部の開口径より小径であつて、該ピストンロツド
開口部にオリフイス５が形成されるようにピスト
ンロツド３内に挿通されている。この固定ロツド
４の付根部には励磁コイル６を巻着すると共に、
シリンダー１、ピストン２および固定ロツド３を
磁性金属で構成する。このように構成すると、前
記励磁コイルに通電することによりシリンダー
１、ピストン２および固定ロツド４に磁気回路７
が形成され、励磁コイル６の通電量（磁界）によ
つてオリフイス５を流れる磁性流体の粘性を変化
させられるようになつている。又、磁性流体の温
度上昇により粘性が下がる場合に備え、励磁コイ
ル６と電源の通電量を変化させる方法としては、
励磁コイル６と電源の回路の途中に温度上昇によ
り抵抗値の下がる素子、例えばサーミスタ８を直
列に接続することにより、励磁コイル６の通電量
（磁界）を調整することができる。励磁コイル６
の通電量を調整することによりオリフイス５を流
れる磁性流体の粘性を変化させることができる。 The drawing shows an example applied to a very general oil damper. 1 is a cylinder filled with magnetic fluid, 2 is a piston, and 3 is a hollow piston rod. Piston 2 and piston rod 3 each have oil passages. 2-1 and an oil hole 3-1 are provided. Reference numeral 4 denotes a fixed rod implanted at one end of the cylinder 1. This rod has a smaller diameter than the opening diameter of the tip of the hollow piston rod 3, and is inserted into the piston rod 3 so that an orifice 5 is formed in the opening of the piston rod. It is inserted. An excitation coil 6 is wound around the base of this fixed rod 4, and
The cylinder 1, piston 2 and fixed rod 3 are made of magnetic metal. With this configuration, by energizing the excitation coil, the magnetic circuit 7 is connected to the cylinder 1, the piston 2, and the fixed rod 4.
is formed, and the viscosity of the magnetic fluid flowing through the orifice 5 can be changed depending on the amount of current (magnetic field) of the excitation coil 6. In addition, in preparation for the case where the viscosity of the magnetic fluid decreases due to a rise in temperature, a method of changing the amount of current flowing through the excitation coil 6 and the power supply is as follows.
The amount of current (magnetic field) in the excitation coil 6 can be adjusted by connecting in series an element whose resistance value decreases with temperature rise, such as a thermistor 8, between the excitation coil 6 and the power supply circuit. Excitation coil 6
By adjusting the amount of current flowing through the orifice 5, the viscosity of the magnetic fluid flowing through the orifice 5 can be changed.
上記緩衝装置において、ピストンロツド３が押
圧されてピスト２が内方へ移動した場合、すなわ
ち圧縮時は油室Ａ内の磁性流体の一部がピストン
２の油路２−１を通り油室Ｂ内に入るとともに、
他の磁性流体がオリフイス５を通りピストンロツ
ド３内室を介して油室Ｂに流入する。伸張時は磁
性流体が圧縮時と逆の方向に流れて減衰力が生じ
る。 In the above shock absorber, when the piston rod 3 is pressed and the piston 2 moves inward, that is, during compression, a part of the magnetic fluid in the oil chamber A passes through the oil passage 2-1 of the piston 2 and enters the oil chamber B. As you enter,
Another magnetic fluid flows into the oil chamber B through the orifice 5 and the inner chamber of the piston rod 3. During expansion, the magnetic fluid flows in the opposite direction to that during compression, creating a damping force.
今、励磁コイル６に通電すると、シリンダー
１、ピストン２および固定ロツド４に磁気回路７
が形成され、オリフイス５を通過する磁性流体の
粘性が変化する。この粘性の変化によりオリフイ
ス５を通過する該磁性流体の流動抵抗が変化する
ため、減衰力が変化する。磁性流体の粘性は、励
磁コイル６に通電する電流の大きさによつて任意
に変化させることができる。すなわち、励磁コイ
ル６に通電する電流が大きい場合は磁性流体の粘
性は上昇し、励磁電流が小さい場合は磁性流体の
粘性は低下する。従つて、励磁コイル６に大きな
電流を流せば、磁性流体の粘性が増しオリフイス
５を通過する磁性流体の流動抵抗が増大するので
大きい減衰力を得ることができ、逆に励磁コイル
６への通電量を減じると、磁性流体の粘性が小さ
くなりオリフイス５を通過する磁性流体の流動抵
抗が減少するので減衰力は小さくなる。この磁性
流体が温度上昇により粘性が低下した場合には励
磁コイル６と電源の回路の途中に入れたサーミス
タにより補償することができる。すなわちサーミ
スタは油温を検出し、油温が上昇することにより
その抵抗を下げるように機能するものである。 Now, when the excitation coil 6 is energized, the cylinder 1, the piston 2, and the fixed rod 4 are connected to the magnetic circuit 7.
is formed, and the viscosity of the magnetic fluid passing through the orifice 5 changes. This change in viscosity changes the flow resistance of the magnetic fluid passing through the orifice 5, and therefore the damping force changes. The viscosity of the magnetic fluid can be arbitrarily changed by changing the magnitude of the current applied to the exciting coil 6. That is, when the current flowing through the exciting coil 6 is large, the viscosity of the magnetic fluid increases, and when the exciting current is small, the viscosity of the magnetic fluid decreases. Therefore, if a large current is passed through the excitation coil 6, the viscosity of the magnetic fluid increases and the flow resistance of the magnetic fluid passing through the orifice 5 increases, so a large damping force can be obtained, and conversely, the current flow through the excitation coil 6 increases. When the amount is reduced, the viscosity of the magnetic fluid becomes smaller and the flow resistance of the magnetic fluid passing through the orifice 5 is reduced, so that the damping force becomes smaller. If the viscosity of this magnetic fluid decreases due to a rise in temperature, it can be compensated for by a thermistor inserted between the excitation coil 6 and the power supply circuit. That is, the thermistor functions to detect the oil temperature and lower its resistance as the oil temperature rises.
このように、この発明はシリンダー内に設けた
励磁コイルへの通電量を変化させるだけで温度上
昇に伴う減衰力を自動的に補償できるのでシリン
ダ内油温が上昇しても安定した減衰力を発生する
ことができ、従つて緩衝能力の優れた緩衝装置を
提供するものである。 In this way, this invention can automatically compensate for the damping force that accompanies a rise in temperature by simply changing the amount of current applied to the excitation coil installed inside the cylinder, so it is possible to maintain a stable damping force even when the oil temperature inside the cylinder rises. Therefore, the present invention provides a shock absorbing device with excellent shock absorbing capacity.
図面はこの発明の一実施態様を示す要部破断正
面図である。
１……シリンダー、２……ピストン、２−１…
…油路、３……中空のピストンロツド、３−１…
…油孔、４……固定ロツド、５……オリフイス、
６……励磁コイル、７……磁気回路、Ａ，Ｂ……
油室。
The drawing is a partially cutaway front view showing an embodiment of the present invention. 1...Cylinder, 2...Piston, 2-1...
...Oil passage, 3...Hollow piston rod, 3-1...
...oil hole, 4...fixing rod, 5...orifice,
6... Excitation coil, 7... Magnetic circuit, A, B...
Oil room.
Claims (1)
性流体が流通し、かつその一端がシリンダー外部
に延出する中空のピストンロツド、および該ピス
トンロツドの他端に固定されかつシリンダー内を
摺動する油路付きピストンからなり、シリンダー
の一端に植設してその付根部に励磁コイルを巻着
した固定ロツドを中空ピストンロツド間にオリフ
イスを設けるよう該中空ピストンロツド内に挿通
し、前記シリンダー、ピストンおよび固定ロツド
を磁性金属で構成して前記励磁コイルへの通電に
より磁気回路が形成され、温度上昇により抵抗値
の下がる素子を前記励磁コイルに直列に接続し励
磁コイルへの通電量が温度変化に追従して変化し
前記オリフイスを通過する磁性流体の粘性を変化
させることにより減衰力を自動補償することを特
徴とした緩衝装置。1 A cylinder in which a magnetic fluid is sealed, a hollow piston rod through which the magnetic fluid flows and one end of which extends outside the cylinder, and an oil passage that is fixed to the other end of the piston rod and slides inside the cylinder. A fixed rod consisting of a piston, which is implanted at one end of the cylinder and has an excitation coil wound around its base, is inserted into the hollow piston rod so as to provide an orifice between the hollow piston rods, and the cylinder, piston, and fixed rod are magnetized. A magnetic circuit is formed by energizing the excitation coil, which is made of metal, and an element whose resistance value decreases as the temperature rises is connected in series with the excitation coil, so that the amount of energization to the excitation coil changes in accordance with the temperature change. A shock absorber characterized in that the damping force is automatically compensated by changing the viscosity of the magnetic fluid passing through the orifice.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP11926982A JPS599331A (en) | 1982-07-09 | 1982-07-09 | shock absorber |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP11926982A JPS599331A (en) | 1982-07-09 | 1982-07-09 | shock absorber |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS599331A JPS599331A (en) | 1984-01-18 |
| JPH0243059B2 true JPH0243059B2 (en) | 1990-09-27 |
Family
ID=14757169
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP11926982A Granted JPS599331A (en) | 1982-07-09 | 1982-07-09 | shock absorber |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS599331A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR20200098327A (en) * | 2019-02-12 | 2020-08-20 | 주식회사 만도 | Apparatus for controlling damper for vehicle |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS6446061A (en) * | 1987-06-01 | 1989-02-20 | Kyoko Mizoguchi | Hydraulic transmission |
| JP2556437B2 (en) * | 1993-09-10 | 1996-11-20 | モリト株式会社 | Hand forming tape |
| US5878851A (en) * | 1996-07-02 | 1999-03-09 | Lord Corporation | Controllable vibration apparatus |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS57173631A (en) * | 1981-04-20 | 1982-10-26 | Kayaba Ind Co Ltd | Hydraulic buffer |
-
1982
- 1982-07-09 JP JP11926982A patent/JPS599331A/en active Granted
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR20200098327A (en) * | 2019-02-12 | 2020-08-20 | 주식회사 만도 | Apparatus for controlling damper for vehicle |
Also Published As
| Publication number | Publication date |
|---|---|
| JPS599331A (en) | 1984-01-18 |
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